Patent Application
20240166926
The present invention relates to a (meth)acrylate-monomer-based composition.
The invention also relates to the use of said composition in the repair and/or the semi- structural or structural adhesive bonding of materials in the transportation, marine, assembly, electronics or construction field.
Acrylic compositions are known reactive systems which crosslink by radical polymerization. They are used as adhesives, mastics and coatings. Radical polymerization is typically initiated by a redox system which, by means of an oxidation-reduction reaction, results in the production of radicals.
Most acrylic systems are two-component systems. The first component conventionally contains the reducing agent and the reactive monomers, and the second component contains the oxidizing agent. Once the two components have been mixed, the reducing agent induces cleavage of the O—O bond of the organic peroxide for example, and initiates polymerization.
Typically, (meth)acrylic compositions comprise a peroxide (oxidizing agent)/tertiary amine (reducing agent) redox system. However, these systems may present storage stability problems in the presence of (meth)acrylate monomer.
There is a need for new (meth)acrylic compositions which allow a good compromise between reactivity and storage stability.
In addition, there is also a need for novel (meth)acrylic compositions with good adhesive properties.
The present invention relates to a crosslinkable two-component composition comprising:
in which:
and
in which:
Rc—SO2−, Q+ (V)
in which:
In the context of the invention, the term “alkyl” means a linear or branched radical preferably comprising from 1 to 20 carbon atoms. Mention may be made, for example, of methyl, ethyl and propyl.
In the context of the invention, the term “aryl” means a monocyclic or bicyclic aromatic radical preferably comprising from 6 to 12 carbon atoms. Mention may be made, for example, of phenyl.
In the context of the invention, the term “cycloalkyl” means a saturated, monocyclic or polycyclic, preferably monocyclic or bicyclic, system preferably comprising from 3 to 12 carbon atoms, the rings possibly being bridged or fused in pairs, such as the cyclopropyl, cyclopentyl, cyclohexyl or norbornyl groups.
In the context of the invention, the term “alkoxy” means an —O-alkyl radical.
Component A comprises a compound of formula (Ia) or (Ib) as defined above.
The anion − may be chosen from the group consisting of FSO3−, CF3SO3, CF2HSO3−, Cl−, Br−, BF4−, BF3Cl− and PF6−.
In the abovementioned formulae (Ia) or (Ib), Rf may represent a haloalkyl. It may, for example, be a fluoroalkyl radical, for instance CHF2 or CH2F.
Preferably, in formulae (Ia) or (Ib), Rf represents a perfluoroalkyl, and even more preferentially CF3, C2F5, C3F7 or C4F9. According to a particularly preferred embodiment, Rf represents CF3.
The compound of formula (Ia) or (Ib) may be chosen from those in which:
According to a preferred embodiment, component A comprises a compound of formula (Ia), in particular chosen from the group consisting of:
and even more preferentially from one of the following compounds:
The compounds of formula (Ia) may be prepared as described in WO 2016/107578. The compounds of formula (Ib) may be prepared as described in WO 2011/013307.
The total content of compound(s) of formula (Ia) or (Ib) may range from 0.05% to 5.0% by weight, preferably from 0.1% to 3.0% by weight, even more preferentially from 0.1% to 1.5% by weight relative to the total weight of the crosslinkable two-component composition.
Component A according to the invention comprises at least one (meth)acrylate monomer M1 having one of the formulae (II), (Ill) or (IV) below:
in which:
The (meth)acrylate monomer M1 may be chosen from the following monomers:
The monomer M1 is preferably chosen from the monomers of formula (II) or (Ill).
It is even more preferentially one of the following compounds or mixtures thereof:
The total content of (meth)acrylate monomer(s) M1 in component A may be greater than or equal to 30% by weight relative to the total weight of said component A.
The content of (meth)acrylate monomer(s) M1 in the crosslinkable two-component composition according to the invention may range from 30% to 99% by weight, preferably from 50% to 99% by weight and even more preferentially from 75% to 99% by weight relative to the total weight of said crosslinkable two-component composition.
Component B comprises at least one compound having the formula (V) below:
Rc—SO2−, Q+ (V)
in which:
According to a preferred embodiment, the compound of formula (V) is chosen from those for which:
The compound of formula (V) may be chosen from the following compounds:
According to a preferred embodiment, the compound of formula (V) is chosen from the following compounds:
The total content of compound(s) of formula (V) as defined above may range from 0.05% to 5.0% by weight.
The total content by weight of compound(s) of formula (V) as defined above may range from 0.1% to 5.0% by weight, preferably from 0.1% to 3.0% by weight, and even more preferentially from 0.1% to 1.5% by weight, relative to the total weight of the crosslinkable two-component composition according to the invention.
In the crosslinkable two-component composition according to the invention, the compound(s) of formula (I)/compound(s) of formula (V) mole ratio may range from 0.01 to 1.2, preferably from 0.02 to 1.1, preferably from 0.04 to 1.0 and even more preferentially from 0.08 to 0.08.
According to a preferred embodiment, the crosslinkable two-component composition does not comprise any peroxide.
Preferably, the two-component composition according to the invention does not comprise any alkyl (meth)acrylate, for instance methyl (meth)acrylate, or benzyl (meth)acrylate.
The crosslinkable two-component composition according to the invention may comprise at least one additive chosen from the group consisting of catalysts, fillers, antioxidants, light stabilizers/UV absorbers, metal deactivators, antistatic agents, film-preventing agents, foaming agents, biocides, plasticizers, lubricants, emulsifiers, dyes, pigments, rheological agents, impact modifiers, adhesion promoters, optical brighteners, flame retardants, anti-sweating agents, nucleating agents, solvents, polymerization inhibitors, and mixtures thereof.
These additives may be present in component A and/or component B of the composition according to the invention.
As examples of plasticizers that may be used, mention may be made of any plasticizer normally used in the field of adhesives, for instance epoxy resins, phthalates, benzoates, trimethylolpropane esters, trimethylolethane esters, trimethylolmethane esters, glycerol esters, pentaerythritol esters, naphthenic mineral oils, adipates, cyclohexyldicarboxylates, paraffinic oils, natural oils (optionally epoxidized), polypropylenes, polybutylenes, hydrogenated polyisoprenes, and mixtures thereof.
Use may be made, for example, of:
As examples of (thixotropic) rheological agent(s) that may be used, mention may be made of any rheological agent customarily used in the field of adhesive compositions.
Preferably, the thixotropic agents are chosen from:
The composition according to the invention may also comprise at least one organic and/or mineral filler.
The mineral filler(s) that may be used are advantageously chosen so as to improve the mechanical performance of the composition according to the invention in the crosslinked state.
As examples of mineral filler(s) that may be used, use may be made of any mineral filler(s) usually used in the field of adhesive compositions. These fillers are typically provided in the form of particles of diverse geometry. They may be, for example, spherical or fibrous or may have an irregular shape.
Preferably, the filler(s) are chosen from the group consisting of clay, quartz, carbonate fillers, kaolin, gypsum, clays and mixtures thereof; preferentially, the filler(s) are chosen from carbonate fillers, such as alkali metal or alkaline-earth metal carbonates, and more preferentially calcium carbonate or chalk.
These fillers may be untreated or treated, for example using an organic acid, such as stearic acid, or a mixture of organic acids predominantly consisting of stearic acid.
Use may also be made of hollow mineral microspheres, such as hollow glass microspheres, and more particularly of those made of calcium sodium borosilicate or of aluminosilicate.
The composition according to the invention may also comprise at least one adhesion promoter, preferably chosen from silanes, such as aminosilanes, epoxysilanes or acryloyl silanes, or adhesion promoters based on a phosphate ester, for instance the 2-hydroxyethyl methacrylate phosphate ester, 2-methacryloyloxyethyl phosphate, bis(2-methacryloyloxyethyl phosphate), 2-acryloyloxyethyl phosphate, bis(2-acryloyloxyethyl phosphate), methyl-(2-methacryloyloxyethyl phosphate), ethyl-(2-methacryloyloxyethyl phosphate), a mixture of 2-hydroxyethyl methacrylate mono- and diphosphate esters.
When a pigment is present in the composition, its content is preferably less than or equal to 3% by weight, more preferably less than or equal to 2% by weight, relative to the total weight of the composition. When it is present, the pigment can, for example, represent from 0.1% to 3% by weight or from 0.4% to 2% by weight relative to the total weight of the composition. The pigments may be organic or inorganic pigments.
For example, the pigment is TiO2, in particular Kronos® 2059 sold by the company Kronos.
As polymerization inhibitor, mention may be made, for example, of 4-hydroxy-2,2,6,6-tetramethylpiperidinoxyl or TEMPOL (CAS: 2226-96-2) sold by the companies BASF and Evonik.
The composition may comprise an amount of from 0.1% to 3%, preferably from 1% to 3%, by weight of at least one UV stabilizer or antioxidant. These compounds are typically introduced in order to protect the composition from degradation resulting from a reaction with oxygen which is liable to be formed by the action of heat or light. These compounds may include primary antioxidants which trap free radicals. The primary antioxidants can be used alone or in combination with other secondary antioxidants or UV stabilizers.
Mention may be made, for example, of Irganox® 1010, Irganox® B561, Irganox® 245, Irgafos® 168, Tinuvin® 328 or TinuvinTM 770, which are sold by BASF.
The crosslinkable two-component composition may also comprise a radical photoinitiator, which may be present in component A and/or component B of the composition. This radical photoinitiator is notably an additional compound to the ingredients of the two-component composition as claimed.
The composition according to the invention may comprise from 0.1% to 5% by weight, preferably from 0.5% to 3% by weight, even more preferentially from 0.5% to 1.5% by weight, of radical photoinitiator(s), relative to the total weight of the composition.
The radical photoinitiator is preferably present in component A.
The radical photoinitiator may be any radical photoinitiator known to those skilled in the art. Under the action of UV/visible radiation, the radical photoinitiator generates radicals which will be responsible for the initiation of the photopolymerization reaction, and makes it possible in particular to increase the efficiency of the photopolymerization reaction. This is, of course, chosen as a function of the light source used, according to its ability to efficiently absorb the radiation selected. It will be possible, for example, to choose the appropriate radical photoinitiator from its UV/visible absorption spectrum. Advantageously, the radical photoinitiator is appropriate for working with irradiation sources emitting in the near zone of the visible region. Advantageously, the source of the UV or visible radiation may be a LED or UVA-centered broad-spectrum lamp of the Delolux 03 S type.
The radical photoinitiator may be chosen from the group consisting of:
Preferably, radical photoinitiator is chosen from the family of phosphine oxides, for instance diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO), ethyl(2,4,6-trimethylbenzoyl)phenylphosphine oxide (TPO-L) and bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylphenylphosphine oxide (BAPO).
For example, when the source of the UV or visible radiation is an LED, the radical photoinitiator may be chosen from 2,4,6-trimethylbenzoyldiphenylphosphine or TPO available, for example, from Lambson under the commercial reference Speedcure® TPO (CAS: 75980-60-8), ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate or TPO-L available, for example, from Lambson under the commercial reference Speedcure® TPO-L (CAS: 84434-11-7), phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide or BAPO (CAS: 162881-26-7) available, for example, from BASF under the commercial reference Irgacure® 819, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-1-butanone (CAS: 119313-12-1) available, for example, from BASF under the commercial reference Irgacure® 369, 2-methyl-1-[4-(methylthio)phenyl]-2-(4-morpholinyl)-1-propanone (CAS: 71868-10-5) available, for example, from BASF under the commercial reference Irgacure® 907, 1-hydroxycyclohexyl phenyl ketone (CAS: 947-19-3) available, for example, from BASF under the commercial reference Irgacure® 184, 2-isopropylthioxanthone or ITX (CAS: 5495-84-1) available, for example, under the reference Speedcure® 2-ITX, or mixtures thereof.
When the composition according to the invention comprises a radical photoinitiator, the total content of compound(s) of formula (Ia) or (Ib) may range from 0.05% to 5.0% by weight, preferably from 0.05% to 3.0% by weight, more preferably from 0.05% to 1.0% by weight and even more preferentially from 0.05% to 0.5% by weight and the total content of compound(s) of formula (V) may range from 0.05% to 5.0% by weight, preferably from 0.05% to 3.0% by weight, more preferably from 0.05% to 1.0% by weight, and even more preferentially from 0.05% to 0.5% by weight relative to the total weight of the crosslinkable two-component composition according to the invention.
According to a preferred embodiment, the composition according to the invention does not comprise any peroxide.
In the composition according to the invention, the component A/component B volume ratio may range from 20/1 to 1/1, preferentially from 10/1 to 1/1.
The present invention also relates to a ready-to-use kit, comprising both component A as defined above and component B as defined above, packaged in two separate compartments. It may, for example, be a two-component cartridge.
Indeed, the composition according to the invention may be in a two-component form, for example in a ready-to-use kit, comprising both component A in a first compartment or drum and component B in a second compartment or drum, in proportions suitable for direct mixing of the two components, for example using a metering pump.
According to one embodiment of the invention, the kit also comprises one or more means for mixing components A and B. Preferably, the mixing means are chosen from metering pumps or static mixers with a diameter suited to the amounts used.
The present invention also relates to the use of a crosslinkable two-component composition as defined above as adhesive, mastic or coating, preferably as adhesive.
The invention also relates to the use of said composition in the repair and/or the structural or semi-structural adhesive bonding of materials in the transportation, motor vehicle (car, bus or truck), assembly, marine, electronics or construction field.
The present invention relates to a process for assembling two substrates by adhesive bonding, involving:
The crosslinking step may be performed at a temperature of between 0° C. and 200° C., preferably between 10° C. and 150° C., preferably between 23 and 80° C. and in particular between 20° C. and 25° C.
The appropriate substrates are, for example, inorganic substrates, such as concrete, metals or alloys (such as aluminum alloys, steel, non-ferrous metals and galvanized metals); or else organic substrates, such as wood, plastics, such as PVC, polycarbonate, PMMA, polyethylene, polypropylene, polyesters, epoxy resins; substrates made of metal and composites coated with paint.
The crosslinking may be performed under electromagnetic irradiation, for instance with a UV radiation source or an LED.
The crosslinking step under electromagnetic irradiation may be performed at a wavelength greater than 300 nm, preferably ranging from 360 nm to 680 nm, and even more preferentially from 360 nm to 420 nm.
The compositions according to the invention are advantageously stable on storage.
The compositions according to the invention advantageously allow a good compromise between stability on storage and high reactivity.
The compositions according to the invention advantageously have, after crosslinking, good adhesive properties.
In addition, the surface of the crosslinked compositions advantageously dries rapidly and may be tack-free, thereby notably making it possible to increase the productivity of industrial processes.
All the embodiments described above may be combined with each other. In particular, the various abovementioned constituents of the composition, and notably the preferred embodiments of the composition, may be combined with each other.
In the context of the invention, the term “between x and y” or “ranging from x to y” means a range in which the limits x and y are included. For example, the range “between 0% and 25%” notably includes the values 0% and 25%.
The invention is now described in the following implementation examples, which are given purely by way of illustration and should not be interpreted in order to limit the scope thereof.
The following ingredients were used:
The ingredients of component A are mixed in the proportions shown in the following table, at a temperature of 23° C., in a continuously stirred mixer and under nitrogen.
Component A and component B are mixed, in a 1:1 volume ratio using a Sulzer® Mixpac mixer at an ambient temperature of 23° C.
The ingredients of component A are mixed in the proportions shown in the following table, at a temperature of 23° C., in a continuously stirred mixer and under nitrogen.
The various ingredients constituting component B are mixed in the proportions shown in the following table, at a temperature of 23° C., in a continuously stirred mixer and under nitrogen.
Component A and component B are mixed, in a 1:1 volume ratio using a Sulzer® Mixpac mixer at an ambient temperature of 23° C.
The ingredients of component A are mixed in the proportions shown in the following table, at a temperature of 23° C., in a continuously stirred mixer and under nitrogen.
The various ingredients constituting component B are mixed in the proportions shown in the following table, at a temperature of 23° C., in a continuously stirred mixer and under nitrogen.
Component A and component B are mixed, in a 1:1 volume ratio using a Sulzer® Mixpac mixer at an ambient temperature of 23° C.
The ingredients of component A are mixed in the proportions shown in the following table, at a temperature of 23° C., in a continuously stirred mixer and under nitrogen.
The various ingredients constituting component B are mixed in the proportions shown in the following table, at a temperature of 23° C., in a continuously stirred mixer and under nitrogen.
Component A and component B are mixed, in a 1:1 volume ratio using a Sulzer® Mixpac mixer at an ambient temperature of 23° C.
The ingredients of component A are mixed in the proportions shown in the following table, at a temperature of 23° C., in a continuously stirred mixer and under nitrogen.
The various ingredients constituting component B are mixed in the proportions shown in the following table, at a temperature of 23° C., in a continuously stirred mixer and under nitrogen.
Component A and component B are mixed, in a 1:1 volume ratio using a Sulzer® Mixpac mixer at an ambient temperature of 23° C.
The ingredients of component A are mixed in the proportions shown in the following table, at a temperature of 23° C., in a continuously stirred mixer and under nitrogen.
The various ingredients constituting component B are mixed in the proportions shown in the following table, at a temperature of 23° C., in a continuously stirred mixer and under nitrogen.
Component A and component B are mixed, in a 1:1 volume ratio using a Sulzer® Mixpac mixer at an ambient temperature of 23° C.
The adhesive bonding tests were performed under the following conditions:
The time at which point it is no longer possible to separate the two slides is recorded.
The reactivity (exotherm) is analyzed continuously using a pyrometer and by thermal imaging. The gel time (or lag time) is the time it takes for the sample to start polymerizing.
The time/temperature profiles were produced using an Omega 05552-V1-6 industrial infrared thermometer (Omega Engineering®, Inc., Stamford, CT) accurate to ±1° C. for 2 g (about 4.0 mm height) and 0.25 g (1.4 mm height) of polymerization.
The results are collated in the following table:
As emerges from this table, compositions 1, 2 and 3 (according to the invention) advantageously polymerize quickly (after mixing components A and B), in view of their short gel times (48, 180 and 60 seconds, respectively). On the other hand, it was observed that the comparative compositions 4 and 5 (Examples 4 and 5) do not polymerize in the open air. Composition 6 does polymerize, but, unlike the parts B of Examples 1, 2 and 3, part B is unstable over time (24 h) and polymerizes, making composition 6 unusable in practice for a commercial product. Furthermore, the comparative composition 6 results in a long gel time: 246 s relative to compositions 1, 2 and 3 according to the invention.
Also, compositions 1, 2 and 3 advantageously lead to adhesive bonding with fast setting times, compared with composition 4, which does not allow bonding.
Finally, it was observed that the polymer obtained after crosslinking is advantageously surface dry (no tack) for compositions 1 (Example 1) and 2 (Example 2) and 3 (Example 3).
| Number | Date | Country | Kind |
|---|---|---|---|
| FR2102661 | Mar 2021 | FR | national |
| FR2105517 | May 2021 | FR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/FR2022/050473 | 3/16/2022 | WO |
