JPS6230745A - Adhesion preventive composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

BACKGROUND OF THE INVENTION This invention relates to compositions of aliphatic amides, and more particularly to anti-taeking agents for storage of rubber sheets in overlapping laminations.
Regarding compositions such as.

In many standard rubber manufacturing operations, unvulcanized rubber is rolled into sheets, laminated one on top of the other, and subsequently stored for weeks to months until needed.

Unvulcanized materials are adhesive and tend to fuse together during storage, making it impossible to separate the sheets when they are used. To prevent this from happening, manufacturers use plastic sheets or anti-adhesion agents to keep the materials separated. The use of plastic sheets is expensive and labor intensive.

Standard anti-adhesion agents are wax powders of carboxylic acid amides of aliphatic diamines, especially ethylene bisstearamide. It has the desirable properties of preventing adhesion of the layers before vulcanization, while adhering during vulcanization of the layer materials in uses such as V-belt manufacturing. It is believed that the amide group of bis-stearamide chemically bonds with the rubber during vulcanization, causing its adhesive properties. For bis-stearamide to be used effectively, it must be used as a fine powder. This powder is an inhalation hazard for workers, and it accumulates throughout the workplace (and thus becomes a daily problem).

Attempts to solve the dust problem using aqueous emulsions have failed because the dispersants that disperse the bisstearamide before application also interfere with adhesion during vulcanization. there were.

Accordingly, it is desirable to provide a method for preventing or substantially reducing adhesion between nidistomer sheets when stacked together during storage, but without interfering with adhesion during vulcanization, and to provide an anti-adhesion composition therefor. It is an object of the present invention to provide a dispersion of a product.

U.S. Patent No. 7. No? , j gu 3 and q, ko 23, 5
No. 9 (the latter is a division of the former) Specification S is alkyl phosphate ester 1i? A mold release agent for liquid thermosetting polyester resin compositions is disclosed that includes an iIW agent in combination with an alkylene bis-alkamide material such as t-ethylenebis(stearoamide). However, there is no disclosure of oxyalkylene fatty acid amide compounds, and the document requires an alkyl phosphate ester.

Furthermore, the mechanism by which unsaturated polyester resins are crosslinked (cured) is completely different from that of rubber vulcanization. The former is based on radical bonding of carbon-carbon double bonds, while the latter is based on sulfur between double bonds to form sulfide crosslinks.

U.S. Patent No. 3. Thirdly, the 1175 specification relates to dispersing organic compounds on the surface of ABS resin.

The organic compound may be ethylenebis(stearoamide)te. However, there is no disclosure regarding a composition containing a polyoxyalkylene fatty acid amide.

U.S. Patent No. 3. gt2,01,1. No. and 3. J'
IO, 219 describes plastic molded articles, namely:
The first patent describes a method for making molded articles of a vinyl chloride polymer compound and the second patent a polyacetal composition, both of which use ethylene stear as a lubricant in a resin or plastic composition. This includes uniformly dispersing lubricants such as Roamide. This composition also does not contain oxyalkylene fatty acid amide.

SUMMARY OF THE INVENTION The present invention relates to methods and compositions for preventing or substantially reducing adhesion between elastomer sheets when stacked together during storage, wherein an aqueous dispersion composition It applies to
The composition has: a) Structural formula: [wherein Ry is an aliphatic moiety derived from a higher aliphatic carboxylic acid of at least 10 carbon atoms to about 33 carbon atoms, and Rx is aliphatic moieties having from 1 to about 33 carbon atoms, n being an integer from l-2; and b) carboxylic acid amides of aliphatic diamines of the formula: [where R is about It is an aliphatic group having 1 to 75 carbon atoms, A is -C2H40-1-C3H60- or a heterogeneous or block mixed group thereof, and n is /-
/! ? It contains an oxyalkylated fatty acid amide represented by the following.

Preferably, in formula I above, RxFi is an aliphatic moiety derived from saturated and unsaturated (non-benzene-like) hydrocarbons and K substituted derivatives thereof, the substituents being inert; The compounds and derivatives have an open chain or cyclic structure, and may contain a small proportion of heteroatoms selected from the group consisting of oxygen, sulfur, and nitrogen in their skeletal structure. Preferred aliphatic moieties have an open chain (linear or branched) carbon backbone of at least/to about 33 carbon atoms, and n is an integer of l-1.

It is to be understood that the carboxylic acid moieties may be the same or different in the bis-aliphatic amide, and that the aliphatic moiety may further have an amide group having the structural formula: be. Suitable fatty acid amides of such aliphatic diamines include, for example, ethylene distearamide, propylene distearamide, butylene distearamide, propylidene dioleamide, N-(ethylidene oleoamide) stearamide, methylene- Bis-
Examples include lauramide, N-(ethylene stearamide) lauramide, N-(methylene palmitamide) caproamide, and the like.

A preferred carboxylic acid amide is N,N'-ethylene-bis-stearoamide.

Preferred oxyalkylated fatty acid amides are those in which all or substantially all A is 102H40-; a is 3; R
is a mixture of C42 to C48 aliphatic groups.

Carboxylic acid amide (a) pair of aliphatic diamine; ir*
The ratio of dialkylated fatty acid amide (b) is approximately 95:3
~! =93, preferably about 0: JO~30:
It is 70. The dispersion comprises, by total weight, about 1 to 75 carboxylic acid amides of aliphatic diamines (a), oxyalkylated fatty acid amides (b), preferably is-% by weight (a) chips (b), It also contains the remainder water.

The dispersion liquid has a temperature of about O1θ! to prevent deterioration of the dispersion liquid during storage. It may contain standard fungicides and bactericides in amounts of ~/, 0% by weight.

3. Those commercially available under the name Vancids, such as Pancide ziz-zinc dimethyldithiocarbamate and zinc komelkabutobenzothiazole and Pancide TH hexahydro-/, 3.
! - Any conventional fungicide can be used, such as triethyl-5-) riazine.

Suitable bactericides include Dow Chemical Company (Do;Ch
@m1cal Company) to Dalaisil (Do
Some products are commercially available in the following varieties: vicll® S, Dalaisil 200, and Nuodex PNA. The latter are mercury compounds.

The dispersion is about 0. It may contain standard accelerators in amounts of /-0.1% by weight. Bismuthate - bismuth dimethyldithiocarbamate, cadmium 174ate - cadmium diethyldithiocarbamate, cuprate (Cumate
) - Any standard rubber compound promoter may be used, such as copper dimethyldithiocarbamate. Others include tetramethylthiuram monosulfide, dipentamethylenethiuram hexasulfide and zinc-monomercabutopenzothiazole. Other accelerators are Kirk and Othmer.
thm@r) Chemical Technology Dictionary (Encyclopeded)
iaof Ch@m1cal Technology)
3rd Edition, Volume 3, No. 331: -3 Hiroshi is disclosed on page 3.

Inorganic accelerators such as lead carbonate, lead oxide, litharge, slaked lime, zinc oxide and magnesium oxide may be used.

Mixtures of organic and metal promoters may also be used. The term "promoter" as used in the present invention includes both inorganic and organic promoters. The total amount of accelerator is about 0, i to 0, % by weight of the composition. The total amount of such additives, ie, bactericides, fungicides, and accelerators, is about 0.05% by weight. The dispersion of the present invention is
It has been found that the problems associated with anti-adhesive powders are overcome and still have good anti-adhesive properties that do not interfere with the vulcanization of the nidistomer by a free radical mechanism. The dispersion of the present invention is made of neoprene, SBR.

It has been found to be effective against EPDM, nitrile, imprene and butadiene rubbers.

The term "SBR" refers to styrene-butadiene copolymer rubbers that are well known and commonly used by those skilled in the art.

This rubber is normally manufactured with a charge of J% styrene and 7S butadiene.

The term "EPDM" is based on ASTM-D-/DA/Z16.
1I and means a terpolymer of ethylene, propylene and diene monomers. A specific method for producing such a terpolymer is described in U.S. Patent No. 3. ．． 2KO, 01:1 and British Patent No. 1,
No. 030,2g9, the disclosures of which are referred to in the present invention. Preferred terpolymers consist of from about to about go weight percent ethylene, from about/to about IO weight percent diene, and the balance of the terpolymer propylene. It is a vulcanizable elastomer used in automotive parts, cable jackets, hoses, footwear, and other products.

The following examples demonstrate the excellent anti-adhesion properties of the compositions of the present invention and further demonstrate that while the dispersion compositions of the present invention exhibit this good adhesion result, conventional dispersions exhibit poor adhesion. prove. The methods for the anti-adhesion test and adhesion test are as follows.

Adhesion prevention test method Rubber material (S″××DA x O9′) (/uha(1)×10
/, b The coating thickness is 3 mils (
0,003") (0,0761 ttm). Air dry the material for 30 minutes and observe the appearance of the coated rubber.

After 3°, the same piece of rubber is placed on top of the coated rubber. Cover both sides of the sample with Mylar (My1, ar) film,
01b (Il, sealed kli+) Weighted and left for 3 hours.

After 2 hours, the load is removed, the samples are examined for adhesion, and each sample is rated individually at 1-5. The lowest value is the best.

Adhesion Test Method The same sample used in the anti-adhesion test was tested in a small laboratory press by /! g for 30 min at fθ°C.

Hardens under psi pressure.

4Z'X /' (10/, Is: 2j, lIm)
Cut a strip from the center of the sample and ASTM D
1113-12, Scotto-Instron (5
Adhesion is tested using a Cott-Instron (Cott-Instron) tester.

Unless otherwise indicated in this specification, all temperatures are in degrees Celsius and all parts and units are by weight.

Example/Yuko neoprene rubber material sample was mixed with 20% N, N'-ethylene bisstearamide; R was various C12 to C1
8 aliphatic group, A is -C2H40-1n is 5, the above formula ■
The mixture was coated with a dispersion consisting of a mixture of 10% fatty acid amides; the balance water. As a control, a rubber material as described in the test method above was used with conventional N.

It was coated with N'-ethylene bisstearamide powder and subjected to the adhesion test procedure described above. The results of these tests are shown in Table I below.

Table I Appearance Test sample Control evaluation when dry and dry lb (klI) ri, s (approximately 3.I
Example 3 and the SBR rubber material sample were prepared using 20% N,N'-ethylene bisstearamide; R is various C12 to C18 aliphatic groups, and A is -C2H40. 70% mixture of fatty acid amides of the formula (1) where -1n is 5;7. The dispersion was coated with the remainder water. As a control, a rubber stock as described in the test method above was coated with conventional N,N'-ethylene bisstearamide powder and subjected to the adhesion test procedure described above. The results of these tests are shown in Table ■ below.

Table ■ Appearance Test sample Control undried and dry evaluation 1b (kg) tb (kg) (wet) 3 Smooth White / /&, j (approx. 7.5 mm)/l
(approx. 5.1kg) smooth white /lb, sc approx.q
, rkg) ib, ri (approximately 7.xkIi) Example 5 Example 1 is repeated except that EPDM rubber is used instead of neoprene rubber. Excellent anti-adhesion properties are obtained and the adhesion properties of the dispersion are comparable to conventional stearochemide powders.

Example 6 Example 1 is repeated except that the dispersion composition consists of 10% N,N'-ethylene bisstearamide, oxyalkylated fatty acid amide/thi and the balance water. Excellent anti-adhesion properties are obtained, and the adhesion is comparable to that of N,N'-ethylenebisstearoamide powder. These properties are stable at room temperature for more than a week and even after two freeze-thaw cycles.

Claims (1)

[Claims] 1. a) Structural formula: ▲There are mathematical formulas, chemical formulas, tables, etc.▼ I [In the above formula, R_y is the number of carbon atoms of at least 10 ~
an aliphatic moiety derived from a higher aliphatic carboxylic acid having about 33 carbon atoms, R_x is an aliphatic moiety having about 1 to 33 carbon atoms, and n is an integer from 1 to 2. [In the above formula, R is an aliphatic group of C_1_2 to C_1_8, and n is 1 to 15. Yes, A is -C_2H_4O-,
-C_3H_6O- or a heterogeneous or block mixed group thereof]; and c) water. 2. The composition contains about 5-75% by weight of two amides (a
) and (b), and contains aliphatic diamine carboxylic acid amide (a) versus oxyalkylated fatty acid amide (b)
2. The composition of claim 1, wherein the ratio of 3. Component (a) is N,N'-ethylene-bis-stearoimide, and A of component (b) is -C_2H_4O-
The composition according to claim 2, wherein n of component (b) is 5. 4. The composition according to claim 2, which contains at least one additive selected from the group consisting of bactericides, fungicides, and accelerators. 5. The composition of claim 4, wherein said composition contains about 0.05-1.5% by weight of said additive. 6. The composition of claim 4, wherein the additive is selected from the group consisting of bactericides and fungicides, and the amount of the additive is about 0.05-1.0% by weight. . 7. The composition of claim 4, wherein said composition contains about 0.1-0.5% by weight of said additive, said additive being an accelerator. 8. The additive, in addition to the bactericide and fungicide, contains about 0
．． 7. A composition according to claim 6, containing from 1 to 0.5% by weight of at least one accelerator. 9. In a method for preventing or substantially reducing adhesion between unvulcanized elastomer sheets due to free radical mechanism when stacked in storage during storage: a) Structural formula: ▲Mathematical formula, chemical formula, table, etc. ▼ I [In the above formula, R_y is at least 10 carbon atoms ~
an aliphatic moiety derived from a higher aliphatic carboxylic acid having about 33 carbon atoms, R_x is an aliphatic moiety having from 1 to about 33 carbon atoms, and n is an integer from 1 to 2. [In the above formula, R is an aliphatic group of C_1_2 to C_1_8, and n is 1 to 15. Yes, A is -C_2H_4O-,
-C_3H_6O- or a heterogeneous or block mixed group thereof]; and c) a dispersion composition comprising water. 10. The dispersion composition contains about 5 to 75% by weight of two amides (a) and (b), and furthermore, the dispersion composition contains about 5 to 75% by weight of two amides (a) and (b), and a carboxylic acid amide of an aliphatic diamine (a) versus an oxyalkylated fatty acid amide (b). 9. The method of claim 8, wherein the ratio of 11. The method according to claim 10, wherein the dispersion contains at least one additive selected from the group consisting of bactericides, fungicides and accelerators. 12. The method of claim 11, wherein said dispersion composition contains about 0.05-1.5% by weight of said additive. 13. The additive is selected from the group consisting of bactericides and fungicides, and the amount thereof is about 0.05-1.0% by weight;
A method according to claim 11. 14. The method of claim 11, wherein the dispersion composition contains about 0.1-0.5% by weight of the additive, and the additive is an accelerator. 15. The method of claim 13, wherein the additive contains, in addition to the bactericide and fungicide, about 0.1 to 0.5% by weight of at least one promoter. . 16. The method of claim 10, wherein the elastomer is neoprene rubber. 17. The method according to claim 10, wherein the elastomer is SBR rubber. 18. The method of claim 10, wherein the elastomer is EPDM rubber.