Patent Application
20240034950
The present invention relates, generally to oils used to lubricate high pressure paper machines, and more specifically to synthetic oils used in high pressure paper machines.
In a paper mill, there are paper machines that utilize high pressure paper machine oil. Current paper machine oils known in the art and available commercially are either mineral oil or Polyalphaolefin (hereinafter “PAO”) synthetics. In the event that a hose or pipe ruptures around an open flame or other hot surfaces, high pressure paper machine lubricant can ignite creating a major safety issue for plant operation and personnel.
Mineral oil is made from highly refined, highly purified and highly processed petroleum. Mineral oil is a clear, odorless liquid and a common ingredient in a variety of cosmetics and personal care products. Mineral oil is also a lubricant used in many industrial applications. As such it is frequently used as a base oil in lubrication fluid formulations.
PAO oils are stable, lubricious fluids that are compatible with most plastics and elastomers and are considered replacement for mineral oils as they provide superior protection, greater thermal stability, and reduced volatility. PAO does not react with water. PAO is by far the most common major synthetic base oil used in industrial and automotive lubricants. PAO is a synthetic hydrocarbon (SEW) that mimics the best hydrocarbon (branched) structure found in mineral oils.
A need, therefore, exists for a high pressure paper machine oil formulation that is fire resistant.
The present invention relates to an anhydrous fire resistant paper machine oil. Using an anhydrous synthetic base material in a paper machine oil formulation that is more fire resistant than petroleum oil derivatives can be harder to ignite, as well as self-extinguishing in the event the oil product does ignite once the flame source is removed, reducing the risk of fire spread. Using a fire resistant product can lower insurance rates, reduce need for fire suppression systems, and increase plant safety.
The present disclosure relates to a fire resistant paper machine oil with better performance than petroleum oil. The fire resistant paper machine oil of the present disclosure contemplates blends of polyol and polyalkylene glycol (hereinafter “PAG”) from 100% polyol to 100% PAG.
An anhydrous fire resistant paper machine oil of the present disclosure preferably consists of the following:
The spray flammability characteristics of hydraulic fluids, and mineral oil, sprayed vertically upward in the open through a pressure-jet hollow cone nozzle and stabilized by a propane-air ring burner, have been evaluated using the Factory Mutual Research Corporation (FMRC) Fire Products Collector. A spray flammability parameter (hereinafter “SEP”) is then defined, which combines the combustion intensity of spray fires in terns of chemical heat release rate with the fluid volatility described by the critical heat flux for ignition. An SFP value has been identified at or below which a range of hydraulic fluids cannot be stabilized as spray flames using a standard flame stabilization test. Mineral oil, some hydraulic fluids, and highly volatile fluids such as n-heptane, methanol and ethanol, have high SFP values and are easy to stabilize as spray flames. SEP has been determined to be useful in discriminating between flammable and less flammable fluids and is governed by Factory Mutual Research Corporation FM 6930 (incorporated herein by reference).
The preferred formula embodiment includes a mixture of an oil soluble base and a water insoluble base material. In a preferred formulation, the most preferred oil soluble base is Polyalkylene Glycol (PAG) and the most preferred water insoluble base is Polyol Ester: All components of the formula of the present disclosure are available commercially from various sources. It is understood that components bearing the same CAS number from alternate commercial sources may be substituted.
Oil Soluble PAG (Polyalkylene Glycol) ISO 15-680 grades*, **73.03 wt %; *Depending on grade of paper machine, this will affect the viscosity of the blended PAG**The oil soluble PAG can be directly substituted with water insoluble PAG, ranging from ISO 22 to ISO 320, blending to product grade.
Properties of the above formulation are as follows:
A blend of the base oils are the most preferred embodiment, however, a product could be formulated using only one type of base material. Broad alternate preferred embodiment formulations using only one type of base material according to the present disclosure are as follows.
Alternate A. Oil Soluble Embodiment:
Alternate B. Water Insoluble Embodiment:
The following table describes additional alternate embodiment formulations of the fire resistant paper machine oil of the present disclosure.
SFP can be estimated using the following parameters determined using known ASTM methods: 1.) Heat of Combustion; 2.) Fire Point; and 3.) Specific Gravity. The determined or estimated SFP for each alternate formulation is set forth in the tables below.
It is to be understood that the terms “including”, “comprising”, “consisting” and grammatical variants thereof do not preclude the addition of one or more components, features, steps, or integers or groups thereof and that the terms are to be construed as specifying components, features, steps or integers.
If the specification or claims refer to “an additional” element, that does not preclude there being more than one of the additional element.
It is to be understood that where the claims or specification refer to “a” or “an” element, such reference is not be construed that there is only one of that element.
It is to be understood that where the specification states that a component, feature, structure, or characteristic “may”, “might”, “can” or “could” be included, that particular component, feature, structure, or characteristic is not required to be included.
Where applicable, although state diagrams, flow diagrams or both may be used to describe embodiments, the invention is not limited to those diagrams or to the corresponding descriptions. For example, flow need not move through each illustrated box or state, or in exactly the same order as illustrated and described.
Methods of the present invention may be implemented by performing or completing manually, automatically, or a combination thereof, selected steps or tasks.
The term “method” may refer to manners, means, techniques and procedures for accomplishing a given task including, but not limited to, those manners, means, techniques and procedures either known to, or readily developed from known manners, means, techniques and procedures by practitioners of the art to which the invention belongs.
The term “at least” followed by a number is used herein to denote the start of a range beginning with that number (which may be a range having an upper limit or no upper limit, depending on the variable being defined). For example, “at least 1” means 1 or more than 1. The term “at most” followed by a number is used herein to denote the end of a range ending with that number (which may be a range having 1 or 0 as its lower limit, or a range having no lower limit, depending upon the variable being defined). For example, “at most 4” means 4 or less than 4, and “at most 40%” means 40% or less than 40%.
When, in this document, a range is given as “(a first number) to (a second number)” or “(a first number) — (a second number)”, this means a range whose lower limit is the first number and whose upper limit is the second number. For example, 25 to 100 should be interpreted to mean a range whose lower limit is 25 and whose upper limit is 100. Additionally, it should be noted that where a range is given, every possible subrange or interval within that range is also specifically intended unless the context indicates to the contrary. For example, if the specification indicates a range of 25 to 100 such range is also intended to include subranges such as 26 -100, 27-100, etc., 25-99, 25-98, etc., as well as any other possible combination of lower and upper values within the stated range, e.g., 33-47, 60-97, 41-45, 28-96, etc. Note that integer range values have been used in this paragraph for purposes of illustration only and decimal and fractional values (e.g., 46.7-91.3) should also be understood to be intended as possible subrange endpoints unless specifically excluded.
It should be noted that where reference is made herein to a method comprising two or more defined steps, the defined steps can be carried out in any order or simultaneously (except where context excludes that possibility), and the method can also include one or more other steps which are carried out before any of the defined steps, between two of the defined steps, or after all of the defined steps (except where context excludes that possibility).
Further, it should be noted that terms of approximation (e.g., “about”, “substantially”, “approximately”, etc.) are to be interpreted according to their ordinary and customary meanings as used in the associated art unless indicated otherwise herein. Absent a specific definition within this disclosure, and absent ordinary and customary usage in the associated art, such terms should be interpreted to be plus or minus 10% of the base value.
Thus, the present invention is well adapted to carry out the objects and attain the ends and advantages mentioned above as well as those inherent therein. While the inventive device has been described and illustrated herein by reference to certain preferred embodiments in relation to the drawings attached thereto, various changes and further modifications, apart from those shown or suggested herein, may be made therein by those of ordinary skill in the art, without departing from the spirit of the inventive concept the scope of which is to be determined by the following claims.
This application claims the benefit of U.S. provisional patent application Ser. No. 63/392,831, filed on Jul. 27, 2022, and incorporates such provisional application fully by reference into this disclosure as if fully set out at this point.
| Number | Date | Country | |
|---|---|---|---|
| 63392831 | Jul 2022 | US |
