Patent Grant
8685159
1. Field of the Invention
The present invention relates to compositions of matter and methods for increasing the cured adhesion strength, hardness and workability of cementitious compositions, such as masonry cements and mortars.
2. Description of the Related Art
Masonry cements and mortars are hydraulic-setting compositions produced particularly for use in bonding of bricks, blocks, and the various components of exterior insulation finishing systems (hereinafter referred to as “EIFS”). Such cements are typically mixed prior to use with a fine aggregate and water. It is desirable that the wet mortar have a high degree of plasticity for working by hand, as well as a relatively a long working time before the cement hardens.
Masonry cements and mortars are produced by grinding Portland cement and gypsum with from about 20 to 65%, of a third material such as limestone, chalk, talc, pozzolans, clay, gypsum, or combinations of such. Portland cement is a type of cement which includes calcined oxides of calcium, aluminum, iron and silicon and is capable of solidifying under water. Such masonry cements are ground to a greater degree of fineness than most Portland cements intended for use in structural concretes. The finer grind of masonry cements improves the plasticity of the finished mortar products.
“Exterior insulation finishing system” or “EIFS” means any one of a number of unique proprietary systems, each of which may consist of specific components associated with a particular EIFS producer. One basic type of EIFS, known as “barrier EIFS”, includes boardstock insulation, reinforced adhesive, and exterior coating arranged in three layers. A less common type of EIFS, known as “drainage EIFS”, may additionally include plastic edge trim, water-resistive barriers, and water drainage cavities. The boardstock is typically expanded polystyrene or extruded polystyrene. One of the persistent problems in EIFS construction is creating a durable and economical adhesive bond between masonry mortar and polystyrene.
The most interior of the three barrier EIFS layers is typically a layer of foam plastic insulation commercially available in the form of polystyrene boardstock. The inner face of the polystyrene boardstock directly contacts a base adhesive (which may be a masonry mortar) and receives mechanical fasteners, such as nails or plugs.
An intermediate adhesive filler layer (which may be a masonry mortar) is applied on the outer face of the polystyrene boardstock insulation, typically by means of a trowel. The adhesive filler layer substantially surrounds and fills a reinforcing mesh, which is embedded in the adhesive filler layer. The mesh is typically made of fiberglass and has openings of about one-quarter inch square. Significantly, preparing the adhesive filler, applying the adhesive filler layer to the outer face of the polystyrene boardstock, and embedding the mesh in the adhesive filler layer are generally considered to be demanding and time-consuming tasks for skilled craftsmen.
The most exterior of the three layers is a called a topcoat. It is normally a colored and textured paint-like material (which may be a masonry mortar) that is applied with a trowel or, less frequently, by spraying. A wide range of colors and textures are available for the topcoat. Available textures include smooth surfaces, rough stucco-like textures, embedded stone chips, granite-like mixtures and brick-like treatments.
U.S. Pat. No. 6,172,147, issued to Abelleira, describes a masonry mortar additive that contains a multi-stage polymer which includes an ionically-soluble polymer stage, and an air entraining agent. The '147 patent lists many exemplary air-entraining agents (referred to collectively in the '147 patent as “AEAs”) as suitable for use in the masonry mortar additive. Among these, listed at Column 4, lines 3-5 of the '147 patent, are anionic AEAs such as sulfosuccinates. In contrast, a spray-dried dialkyl sulfosuccinate salt composition of the present invention acts as a deaerating agent upon mixing with a mineral mortar and water (as set forth below in Example 8).
U.S. Pat. No. 7,204,065, issued to Naji, describes a method for applying a cementitious formulation to a substrate, such as polystyrene, over a confining mesh attached to the substrate. In certain aspects, such as an aspect claimed in claim 25 of the '065 patent, the formulation reportedly includes an air entraining agent (referred to collectively in the '065 patent as “AEAs”). Among these, listed at Column 6, lines 56-59 of the '065 patent, are anionic AEAs such as sulfosuccinates. In contrast, a spray-dried dialkyl sulfosuccinate salt composition of the present invention acts as a deaerating agent upon mixing with a mineral mortar and water (as set forth below in Example 8).
Canadian Patent 491099, issued to Vitalis, describes surface-active dialkyl sulfosuccinates compositions that are prepared in the form of dry, non-caking water-soluble powders by spray-drying with sodium benzoate as a hardener at 600-700 degrees F. However, the '099 patent compositions are not panaceas and may yet be improved upon because, among other reasons, they contain sodium benzoate. One objection to the '099 patent compositions is that sodium benzoate absorbs water in humid atmospheres, and caking and clumping may be expected if the ambient humidity exceeds 50%. Another objection to the '099 patent compositions is that sodium benzoate has been associated with skin and eye irritation in dry atmospheres.
A need exists for an improved solid surfactant that flows freely under humid atmospheric conditions and dissolves quickly in water. Preferably, the new solid surfactant will strengthen adhesive bonding between masonry mortars and smooth, hydrophobic surfaces such as those used in EIFS. Ideally, the new solid surfactant will increase the hardness and reduce the water uptake of masonry cements and mortars.
It has now been discovered that certain additives, herein referred to as adhesion enhancers, can be utilized in cement-based mortars to improve adhesive bond strength between the mortars and relatively hydrophobic plastic materials, such as polystyrene. The adhesion enhancers additives may be broadly categorized as surfactant agents, and include dialkyl sulfosuccinates and their salts. The adhesion enhancers of the invention are free-flowing solid compositions. Processes for preparing and using the free-flowing, solid adhesion enhancers are described below.
In one aspect, the invention is a free-flowing solid surfactant composition that includes a surfactant and carrier particles. The surfactant may be one or more alkyl sulfosuccinates, one or more salts of alkyl sulfosuccinates, or a mixture of these. The carrier particles are composed of an absorbent calcium carbonate, calcium silicate, silicon dioxide, kaolin, or mixtures of these. The carrier particles have a mean average particle size of about 0.1 to about 1000 micrometers, and a capacity for carrying an amount by weight of the surfactant that is preferably about 0.2 to about 5 times the weight of the carrier particles.
In another aspect, the invention is a free-flowing solid surfactant composition that includes about 30 to about 75 weight percent of a surfactant composed of alkyl sulfosuccinates, salts of dialkyl sulfosuccinates, or mixtures of these. The composition also includes about 10 to about 75 weight percent of carrier particles which are composed of an absorbent material selected from the group consisting of calcium carbonate, calcium silicate, silicon dioxide, kaolin, or mixtures of these. The carrier particles have a mean average particle size of about 1 to about 160 micrometers, and the capacity to absorb an amount by weight of the surfactant that is about 0.2 to about 4 times the weight of the carrier particles. In addition, the composition includes about 1 to about 10 weight percent of an anticaking agent.
In yet another aspect, the invention is a dry-mix mortar composition including a dry-mix, hydraulic-setting mortar or cement, a solid surfactant composition as described above, and an anticaking composition.
The invention is also a process for manufacturing a free-flowing solid surfactant composition. The process includes introducing a surfactant selected from the group consisting of alkyl sulfosuccinates, salts of alkyl sulfosuccinates, and mixtures thereof into an absorption zone. Carrier particles are also introduced into the absorption zone. The carrier particles are composed of an absorbent material selected from the group consisting of calcium carbonate, calcium silicate, silicon dioxide, kaolin and mixtures thereof; have a mean average particle size of about 0.1 to about 1000 micrometers; and have a capacity for carrying an amount by weight of the surfactant that is about 0.2 to about 5 times the weight of the carrier particles. The surfactant and the carrier particles are maintained in the absorption zone at conditions effective for absorption of the surfactant by the carrier particles to produce solid surfactant particles. An anticaking agent is optionally mixed with the solid surfactant particles to produce a free-flowing solid surfactant composition.
In still another aspect, the invention is a process for manufacturing a free-flowing solid surfactant composition by spray-drying a liquid solution including a surfactant selected from the group of dialkyl sulfosuccinates and salts thereof in the presence of carrier particles, and optionally anti-caking agents, to produce a free-flowing solid surfactant composition. A defoamer, a non-ionic surfactant, or both maybe blended with liquid solution
The invention is also a process for forming an adhesive bond between a mortar composition and an article composed of a polymer plastic material. The process involves providing a mortar composition that includes a solid surfactant composition as described above and establishing and maintaining physical contact between the cement composition and an article composed of a polymer plastic material at conditions effective for curing of the mortar composition.
The invention provides an adhesive strength enhancer for hydraulic setting materials. For example, the invention can be used to improve the strength of an adhesive bond between a) gypsum based plaster or stucco and concrete or bricks, b) tile adhesives and concrete, and c) mineral mortars on polystyrene boards.
In a preferred embodiment, the invention is a free-flowing solid surfactant composition that is useful as an adhesion enhancer for cementitious mortars and that includes a surfactant and carrier particles. Because the construction industry is well equipped to handle pre-mixed mortars and cements that arrive at a job site in powder form, the free-flowing quality of this adhesion enhancer is highly desirable.
The surfactant includes one or more alkyl sulfosuccinates, and/or one or more salts of alkyl sulfosuccinates. Preferably, the alkyl sulfosuccinates and the salts are dialkyl, more preferably dialkyl with alkyl carbons atoms totaling 16 to 32 per molecule. Dioctyl sodium succinate, didecyl sodium succinate, and their sodium or ammonium salts are especially preferred. For the present purposes, “alkyl carbon atom” means a carbon atom situated within an alkyl ligand of a sulfosuccinate moiety.
The surfactant is preferably present in an amount of about 30 to about 75 weight percent, based on the total weight of the solid surfactant composition; more preferably about 35 to about 65 weight percent; and most preferably about 45 to about 55 weight percent.
The carrier particles are composed of calcium carbonate, calcium silicate, silicon dioxide, kaolin or mixtures of these. The carrier particles should have a mean average particle size of about 0.1 to about 1000 micrometers, preferably about 1 to about 200 micrometers, most preferably about 10 to 160 micrometers. A typical preferred particle size distribution includes 50% of particle below 4 micrometers, 95% of particles below 26 micrometers, and 100% of particles below 56 micrometers.
Carrier particles less than 1 micrometer are not recommended for use in the invention because they cause dusting problems and are sometimes associated with risks to human health. Also, these extremely small particles tend to settle out of mixtures with other solids, rather than distribute homogeneously as is necessary for use in mortar and cement mixtures. Ideally, the solid surfactant composition will be a particulate with the same particle size distribution as a mortar or cement to which it is added.
The carrier particles are preferably present in an amount of about 10 to about 75 weight percent, based on the total weight of the solid surfactant composition; more preferably about 20 to about 60 weight percent; most preferably about 25 to about 55 weight percent. The carrier particles preferably have a capacity for carrying an amount by weight of the surfactant that is about 0.2 to about 5 times the weight of the carrier particles, more preferably about 1 to about 4 times the weight of the carrier particles, most preferably about 1 to about 3 times the weight of the carrier particles.
The carrying capacity of the carrier particles is a key factor for adjusting the rate at which the surfactant dissolves when a solid surfactant composition of the present invention is immersed in water or any other solvent. For chemical operators in general, and construction crews that mix mortar and cement in particular, a relatively rapid dissolution is highly desirable. Dissolution of the surfactant from carrier particle tends to be more rapid from carrier particles that have lower carrying capacity. On the other hand, solid surfactant compositions in which the carrier particles have too low a carrying capacity tend to cake and clump, rather than flow freely.
As set forth above, the carrier particles preferably have a mean average particle size of about 0.1 to about 1000 micrometers and a capacity for carrying an amount by weight of the surfactant that is preferably about 0.2 to about 5 times the weight of the carrier particles. In addition, the inventors have found that suitable carrier calcium carbonate particles in this size range usually have about a specific surface area of about 0.1 to about 15 square meters per gram. Suitable silicon dioxide particles in this size range usually have a specific surface area of about 100 to about 600 square meters per gram. For calcium silicate, suitable carrier particles usually have a specific surface area of about 100 to about 300 square meters per gram. In the case of kaolin, suitable particles usually have specific surface area of up to 20 square meters per gram.
In addition, the solid surfactant composition preferably includes an anticaking agent. For the present purposes, “anticaking agent” means a material that tends to prevent agglomeration of certain solids, thereby promoting flowability of the solids. Without intending to be bound by theory, it is believed that anticaking agents function by adsorbing excess moisture, or by coating particles and making them water repellent. Examples of useful anticaking agents include calcium silicate, silicon dioxide, magnesium oxide, magnesium or calcium stearates, kaolin and bentonites. Some anticaking agents can serve two or more purposes, such as absorbing liquids and promoting flowability. Hydrophobic silicon dioxide is especially preferred as an anticaking agent.
The anticaking agent is preferably present in an amount of about 1 to about 10 weight percent, based on the total weight of the solid surfactant composition; more preferably about 4 to about 8 weight percent.
In another preferred aspect, the invention is a dry-mix, hydraulic-setting mortar or cement composition. The dry-mix position is in powder or granulated form, and includes a hydraulic-setting, dry-mix mortar or cement; a solid surfactant composition as described above; carrier particles as described above; and an anticaking agent as described above. Preferably the solid surfactant composition includes about 0.1 to about 1 wt %, preferably about 0.2 to about 0.8 wt %, and more preferably about 0.3 to about 0.7 wt % of alkyl sulfosuccinates and/or salts of alkyl sulfosuccinates, based on the total weight of the dry-mix composition.
The inventors have discovered that the presence of about 0.1 to about 1 wt %, dioctyl sulfosuccinates, didecyl sulfosucinates, and/or salts of these sulfosuccinates in a dry-mix composition of the invention significantly increases the adhesive strength of a hydraulically-set mortar or cement produced from the dry-mix composition, as compared to hydraulically-set mortar or cement produced from a dry-mix composition that includes no dioctyl sulfosuccinates, no didecyl sulfosucinates, and no salts of these sulfosuccinates ne of these sulfosuccinates but is otherwise identical. Additional information regarding this discovery is provided below in Example 5, Example 6, and Example 7, among other places.
In yet another preferred embodiment, the invention is a process for manufacturing a free-flowing solid surfactant composition. The process includes introducing a surfactant selected from the group consisting of alkyl sulfosuccinates, salts of alkyl sulfosuccinates, and mixtures these sulfosuccinates and/or salts into an absorption zone. The surfactant may be introduced in liquid form, in solid form, or as a solute in a liquid solution. Suitable surfactants are described above with regard to a solid surfactant composition.
Carrier particles are also introduced into the absorption zone. The carrier particles which are composed of an absorbent material selected from the group consisting of calcium carbonate, calcium silicate, silicon dioxide, kaolin, and mixtures thereof; have a mean average particle size of about 0.1 to about 1000 micrometers, and have a capacity for carrying an amount by weight of the surfactant that is about 0.2 to about 5 times the weight of the carrier particles into the absorption zone. Suitable carrier particles are described above with regard to the solid surfactant composition.
The surfactant and the carrier particles are maintained in the absorption zone at conditions effective for absorption of the surfactant by the carrier particles to produce a free-flowing solid surfactant composition. The effective conditions may include mixing, kneading, agitating or spray-drying the surfactant with the carrier particles. Preferably, conditions effective for spray-drying the surfactant with carrier particles are maintained in the absorption zone. Optionally, an anticaking agent, such as hydrophobic silicon dioxide, is introduced into the absorption zone, where it is mixed with the solid surfactant particles to promote flowability.
When conditions effective for spray-drying the surfactant with the carrier particles are maintained in the absorption zone, the surfactant is preferably introduced as a solute in an aqueous solution. A defoamer, a non-ionic surfactant, or both may be blended with the liquid solution. Preferably, a fluidized bed of surfactant solution droplets and carrier particles is maintained in the absorption zone at a temperature that is cool enough to permit absorption of the solution into the carrier particles and warm enough to evaporate the solution the solution at a commercially practical rate. The concentration at which the solution is introduced, the temperature at which the solution is introduced, the relative sizes and amounts of the solution droplets and the carrier particles, and the superficial velocity and inlet temperature of fluidizing gas are factors in determining the effective conditions. These factors and techniques for their optimization are known to practitioners in the art of fluidized bed spray-drying.
When conditions effective for concentrating a liquid surfactant by vacuum drying, rotary evaporator drying, or similar drying techniques are maintained in the absorption zone; the surfactant is preferably introduced as a sulfosuccinate solution or a sulfosuccinate salt solution. The solution is preferably mixed, kneaded, shaken or otherwise agitated with absorbent carrier particles. Additional ingredients, such as a defoaming agent or a non-ionic surfactant, may be introduced into to the absorption zone directly, or introduced into the absorption zone via the sulfosuccinate salt solution. It is possible to produce free-flowing solid surfactant particles without removing all of the solvent from the particles.
In still another preferred aspect, the invention is a process for forming an adhesive bond between a hydraulic-setting, cementitious mortar composition and an article composed of a polymer plastic material. The polymer plastic material may be composed of, for example, expanded polystyrene or extruded polystyrene, and may be incorporated in a system, such as an exterior insulation finishing system.
In the process, a mortar composition is provided that includes a solid surfactant composition as described above. Physical contact is established between the mortar composition and the article composed of a polymer plastic material. This contact is maintained at conditions effective for curing of the mortar composition, thereby forming an improved adhesive bond between the mortar composition and the article. Preferably, the conditions effective for curing the mortar composition include maintaining a temperature warmer than 32 degrees F. for a period of about 1 to about 30 days. The conditions effective for curing of the mortar composition are well known to practitioners in the field of cement and mortar formulation.
The following examples are presented to better communicate the invention, and are not meant to limit the invention in any way. Unless otherwise indicated, all references to parts, percentages or proportions are based on weight.
The following procedure (hereinafter referred to as “Procedure 1”) is performed for preparing solid formulations of the invention. An aqueous dialkyl sulfosuccinate salt solution is spray dried with carrier particles and/or anti-caking particle in a fluidized bed to produce a free-flowing solid formulation with good caking resistance. For the present purposes, this dialkyl sulfosuccinate salt is referred to as “active ingredient”. Optionally, additional ingredients such as surfactants, spray-drying aids or anti-foaming agents may be added to the contents of the fluidized bed in order to modify the physical or chemical properties of the solid formulation. The flow rates and temperatures of the fluidized bed, and of streams entering the fluidized bed, were optimized and maintained by techniques well-known to practitioners in the art of spray-drying. Table 1, below, summarizes the sulfosuccinate salts and particles introduced into the fluidized bed spray drier for specific procedures 1a through 1e, based on the mass of the solid formulations produced by the procedure.
*precipitated calcium carbonate particulate commercially available from Omya Hamburg GmbH of Hamburg, Germany under the tradename Omyacarb ®
+hydrophobic precipitated silicon dioxide particulate commercially available from Evonik Degussa Corporation of Wesseling, Germany under the tradename Sipernat ®
The data of Table 1 above demonstrates that free-flowing, solid formulations of the invention can be produced by spray-drying an aqueous dialkyl sulfosuccinate salt solution with carrier particles and/or anti-caking particles in a fluidized bed.
The following procedure (hereinafter referred to as “Procedure 2”) is performed for preparing solid formulations of the invention. Particulate solids with a favorable absorption capacity for oleaginous liquids and desirable flow properties are introduced into a mixing or kneading device. A liquid solution including a dialkyl sulfosuccinate or a dialkyl sulfosuccinate salt is added to the particulate solids while mixing, kneading or otherwise agitating the contents of the device proceeds. The liquid solution is absorbed into the absorbent particles to produce free-flowing solid formulations with good caking resistance. Optionally, additional ingredients such as surfactants or anti-foaming agents are added to the contents of the device in order to modify the physical or chemical properties of the solid formulations. Table 2, below, summarizes the solutions, the absorbent particles, the additional ingredients (if any), and the solid formulations of specific procedures.
*precipitated calcium silicate particulate commercially available from J.M. Huber Corporation of Oostende, Belgium under the tradename Zeofree ®
+hydrophobic precipitated silicon dioxide particulate commercially available from Evonik Degussa Corporation of Wesseling, Germany under the tradename Sipernat ®
The data of Table 2 above demonstrates that free-flowing, solid formulations of the invention can be produced by admixing an aqueous dialkyl sulfosuccinate salt solution in liquid for with absorbent carrier particles and/or absorbent anti-caking particles.
The following procedure (hereinafter referred to as “Procedure 3”) is performed to prepare solid formulations of the invention. A dialkyl sulfosuccinate salt solution is dried to produce a wax-like solid, comminuted as necessary, and blended with particles having desirable flow properties to produce a free-flowing solid formulation with good caking resistance. Optionally, additional ingredients such as surfactants or anti-foaming agents are added to the contents of the mixer in order to modify the physical or chemical properties of the solid formulation. Table 3, below, summarizes the dried dialkyl sulfosuccinate salts, the particles, the additional ingredients (if any), and the solid formulations produced by specific procedures.
~hydrated aluminium silicate particulate commercially available from KaMin LLC of Macon, Georgia, U.S.A. under the tradename KaMin ™ 90
*precipitated calcium carbonate particulate commercially available from Omya Hamburg GmbH of Hamburg, Germany under the tradename Omycarb ®
+hydrophobic precipitated or fumed silicon dioxide particulate commercially available from Evonik Degussa Corporation of Wesseling, Germany under the tradenames Sipernat ® and Aerosil ®
The data of Table 3 above demonstrates that free-flowing, solid formulations of the invention can be produced by blending a dried dialkyl sulfosuccinate salt solution in solid form with carrier particles and/or anti-caking particles.
The following performance testing procedure (hereinafter referred to as “the Testing Procedure”) is performed in order to determine the effect of an adhesive bond strength enhancer on an adhesive bond between a cement composition and a board composed of expanded or extruded polystyrene. In the procedure, solid strength enhancers are pre-mixed for about one minute with a dry cement composition. In either case, the cement composition is selected from mineral adhesive and reinforcement mortars, such as “BAUMIT Adhesivefiller (“Klebespachtel”)™” and “BAUMIT Adhesivefiller Allround (“Klebespachtel Allround”)™”, which are commercially available from Baumit. The mineral mortar is added to water in a ratio of 4 to 1 and mixed for one minute. In each trial, an active concentration use level of 0.3 to 0.6 mass % dialkyl sulfosuccinate salt is utilized.
A 2 to 3 mm wet mortar layer is applied evenly on an expanded or extruded polystyrene board, such as an extruded XPS polystyrene board commercially available form BASF under the tradename “Styrodur 3035 CS.” The wet mortar test specimens are dried over a period of 7, 14 or alternatively 28 days. At the end of the drying period, the adhesive strength of the bond between the mortar and the expanded polystyrene board is measured in accordance with test protocol DIN EN ISO 4624:2003. A pull-off adhesion tester is employed in the protocol. Each of the tests is conducted in general 6 to 10 times with a strength enhancer of interest, and the same number of times without any strength enhancer for comparison. An adhesion enhancement value (in units of percentage increase) is calculated by dividing the mean average of results for each test with strength enhancer by the mean average of test results without strength enhancer, subtracting one, and multiplying the difference times 100.
Employing the Testing Procedure, adhesion enhancement values are determined for various spray-dried dialkyl sulfosuccinate salts and presented in Table 4, below.
Inspection of Table 4 above reveals that diisodecyl sodium sulfosuccinate in solid form of 38% active content, and diisooctyl sodium sulfosuccinate in solid form of 45% active content, produced by the spray-drying process described above in Example 1 significantly increase the strength of an adhesive bond between a polystyrene board and a variety of commercially available mineral mortar products.
In order to determine the effect of use-level on adhesive strength, the Testing Procedure described above in Example 4 is performed for various use-levels of a particular spray-dried solid surfactant composition in a certain mineral mortar on identical polystyrene boards.
In the procedure, a solid surfactant composition produced by spray-drying an aqueous solution of dioctyl sulfosuccinate salt with a calcium carbonate carrier is pre-mixed for about a minute with a dry-mix, hydraulically-setting, cementitious mineral mortar composition that is commercially available under the trade name “BAUMIT Adhesivefiller Allround™” from Baumit. The mineral mortar is added to water in a ratio of 4 to 1 and mixed for one minute. In each trial, an active concentration use-level in the range of 0.1 to 0.8 mass % of dioctyl sulfosuccinate salt is utilized.
A 2 to 3 mm wet mortar layer is applied evenly on an extruded polystyrene board commercially available from Dow under the trade name Austrotherm Top P. The wet mortar test specimens are dried over a period of 7 days. At the end of the drying period, the adhesive strength of the bond between the mortar and the extruded polystyrene board is measured in accordance with test protocol DIN EN ISO 4624:2003 using a pull-off adhesion tester. An adhesion enhancement value (in units of percentage increase) is calculated by dividing the mean average of results for each test with strength enhancer by the mean average of test results without strength enhancer, subtracting one, and multiplying the difference times 100.
Employing the Testing Procedure, adhesion enhancement values are determined for a various use-levels of a particular spray-dried dioctyl sulfosuccinate salt in a certain mineral mortar on identical polystyrene boards and presented in Table 5, below.
Inspection of Table 5 above reveals that addition of dioctyl sulfosuccinate salt in solid form, in the range of 0.22 to 1.78 mass % Strength Enhancer use-level, significantly increases the strength of an adhesive bond between a polystyrene board and a commercially available dry-mix mineral mortar product. Based on this data, it appears that an anomaly for adhesive strength enhancement exists in the range of about 0.1 to about 1 mass % active use-level.
The Testing Procedure described above in Example 4 is performed with a free flowing, solid adhesive bond strength enhancing composition prepared by the process described in above in Example 2 in order to determine the effect of these compositions on an adhesive bond between a cementitious composition and a board composed of extruded polystyrene. Employing the Testing Procedure at two different use levels of a dialkyl sulfosuccinate salt, adhesion enhancement values are measured and presented in Table 6 below.
+hydrophobic precipitated silicon dioxide particulate commercially available from Evonik Degussa Corporation of Wesseling, Germany under the tradename Sipernat ®
The results presented in Table 6 are proof that a dry, free-flowing, solid composition prepared by the admixture process described above in Example 2 significantly increases the strength of an adhesive bond between a polystyrene board and a commercially available mineral mortar product.
Various dried dialkyl sulfosuccinate salts are blended with solid carrier materials in accordance with Procedure 3, which is described above in Preparative Example 3. Adhesion enhancement values are determined for the dried dialkyl sulfosuccinate salts with solid carrier materials in accordance with the Testing Procedure, as set forth above in Example 6. In each trial, an active concentration of 0.5 mass % dried dialkyl sulfosuccinate salt is utilized. The resulting adhesion enhancement values are presented in Table 7 below.
Based on the results presented above in Table 7, one may reasonably conclude that the presence of dry, free-flowing, solid compositions prepared by the dry blending process described above in Example 3 significantly increases the strength of an adhesive bond between a polystyrene board and a commercially available mineral mortar product.
A solid surfactant composition that contains 45% diisooctyl sulfosuccinate salt prepared in accordance with Procedure 1, set forth above in Preparative Example 1. In various demonstration tests, the solid surfactant composition is mixed at known concentrations for one minute with a mineral mortar and water that are present in a proportion of 4:1, and the volume of the mixture is measured. The volumes are set forth below in Table 8.
1DOSS means diisooctyl sodium sulfosuccinate in solid form, of 45% active content, produced by the spray-drying process described above in Example 1.
2Baumit means Wietersdorfer & Peggauer Zementwerke GmbH, A-9373 Klein, St. Paul
The results presented above in Table 8 indicate that a solid surfactant composition of the invention acts as a deaerating agent upon mixing with a commercially available mineral mortar and water. In fact, the concentration of diisooctyl sulfosuccinate in the mixture is directly proportional to the deaeration.
The above Examples are intended to better communicate the invention, and do not limit the invention in any way. The invention is defined solely by the appended claims.
This application is a continuation of allowed application Ser. No. 12/928,393, which was filed on Dec. 10, 2010.
| Number | Name | Date | Kind |
|---|---|---|---|
| 5733365 | Halko et al. | Mar 1998 | A |
| 20070276066 | Ohno et al. | Nov 2007 | A1 |
| Number | Date | Country | |
|---|---|---|---|
| 20130344250 A1 | Dec 2013 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12928393 | Dec 2010 | US |
| Child | 14018363 | US |
