JPH0623282B2 - Chlorinated polyethylene rubber composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a chlorinated polyethylene rubber composition. More specifically, it relates to a chlorinated polyethylene rubber composition having improved compression set without substantially deteriorating the desirable physical properties inherent in the chlorinated polyethylene rubber.

[Conventional technology]

The vulcanized molded product of chlorinated polyethylene rubber is used in many fields including rubber hoses and rubber packings as a material having high strength and excellent heat resistance.

In order to obtain a low compression set in this vulcanized molded article, organic peroxides have been conventionally used as vulcanizing agents, and triallyl isocyanurate and triallyl cyanurate as vulcanization aids, respectively. When such a vulcanizing system is used, there is a new drawback that the tensile strength and the elongation are greatly reduced.

[Problems to be solved by the invention]

Therefore, there is a strong demand for a vulcanization system capable of giving a vulcanized molded product having an improved compression set without substantially deteriorating the desirable physical properties inherent in chlorinated polyethylene rubber. Is.

The present inventor, as a result of earnest research to solve such a problem, by using a specific 1,3,5-triazine derivative together with an organic peroxide vulcanizing agent, the above problems can be effectively solved. I found that.

[Means for Solving Problems] and [Action] Therefore, the present invention relates to a chlorinated polyethylene rubber composition, and the chlorinated polyethylene rubber composition includes chlorinated polyethylene rubber, 6-anilino-1,3, It comprises 5-triazine-2,4-dithiol, organic peroxide and triallyl isocyanurate or triallyl cyanurate.

As chlorinated polyethylene rubber, the degree of chlorination is about 30-40
Mol%, preferably about 30-35 mol% chlorinated polyethylene is used.

6-anilino-1,3,5-triazine-2,4-dithiol is generally used in a proportion of about 0.1 to 1.0 part by weight, preferably about 0.3 to 0.5 part by weight, per 100 parts by weight of chlorinated polyethylene rubber. If it is used in a ratio other than this, the effect of improving the compression set, which is the object of the present invention, cannot be obtained.

Examples of the organic peroxide used as the vulcanizing agent include tert-butyl hydroperoxide, cumene hydroperoxide, di-tert-butyl peroxide, tert-butyl cumyl peroxide, di-cumyl peroxide, and 2,5-dimethyl. -2,5-di (tertiary butylperoxy) hexane, 2,5
-Dimethyl-2,5-di (tertiary butylperoxy) hexine-
3,1,3-bis (tertiary butylperoxyisopropyl) benzene, 1,1-bis (tertiary butylperoxy) -3,3,5-trimethylcyclohexane, n-butyl-4,4-bis (tertiary 3 butyl peroxy) valerate, benzoyl peroxide, p-chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butyl peroxybenzoate, tert-butyl peroxyisopropyl carbonate, tert-butyl benzoate, etc. To be

These organic peroxides are chlorinated polyethylene rubber 100
When using one having 1 effective functional group per part by weight, about 0.5 to 7 parts by weight, preferably about 2 to 5 parts by weight (about 1.3 to 18.1 mmol per 100 g of chlorinated polyethylene rubber,
The ratio is preferably about 5.2 to 12.9 mmol), and about 0.25 to 3.5 parts by weight, preferably about 1 to 2.5 parts by weight (about 0.7 to 100 g of chlorinated polyethylene rubber) when one having 2 effective functional groups is used. ~ 9.0 mmol, preferably about 2.6
~ 6.5 mmol), respectively.

In the chlorinated polyethylene rubber composition according to the present invention, in addition to the above essential components, various fillers, reinforcing agents, plasticizers,
Processing aids, pigments, flame retardants and the like can be added as required. In addition to these components, vulcanization aids such as triallyl isocyanurate and triallyl cyanurate, which are also used in conventional vulcanization systems, are added in an amount of about 5 to 20 parts by weight per 100 parts by weight of chlorinated polyethylene rubber. By blending it, it is possible to improve the emphasis on compression set. Also, metal oxides such as lead oxide, magnesium oxide, and lead trioxide, calcium hydroxide, calcium carbonate, etc. are used as acid acceptors, and chlorinated polyethylene rubber 100 By mixing about 5 to 20 parts by weight per part by weight, vulcanization at a relatively low temperature can be easily performed.

The composition can be prepared by any means, for example, by using a mixing roll, a Banbury mixer, various kneaders and the like. Vulcanization of the prepared composition is generally about 0.5-1 at a temperature of about 100-200 ° C.
It is carried out while applying a molding method such as pressure molding or injection molding while heating for about 20 minutes.

〔The invention's effect〕

The chlorinated polyethylene rubber composition according to the present invention improves the compression set of a vulcanized molded product without substantially deteriorating the desirable physical properties inherent in the chlorinated polyethylene rubber. Therefore, the chlorinated polyethylene rubber composition of the present invention can be effectively used for the above-mentioned various uses.

〔Example〕

 Next, the present invention will be described with reference to examples.

Example A chlorinated polyethylene rubber composition having the following blending amount was added to 60 to 70
The mixture was kneaded by an open roll at ℃, put into a sheet, put into a mold, and pressure molded under the conditions of 180 ℃, 100 kg / cm ² , 10 minutes.

Chlorinated polyethylene rubber 100 parts by weight [Osaka Soda Product Erasulene 301AE] FEF Carbon Black 60 [Tokai Carbon Product Seast SO] Plasticizer (Dioctyl sebacate) 40 Lead oxide 10 Triallyl isocyanurate 2.5 [Nippon Kasei Product TAIC] 1,3 -Bis (tertiary butylperoxy 2.5 isopropyl) benzene [Sanken Chemical product Sanperox TY 1.3] 6-anilino-1,3,5-triazine-0.5 2,4-dithiol [Sankyo Kasei product DISNNET AF] Comparative Example 1 In the examples, instead of 6-anilino-1,3,5-triazine-2,4-dithiol, the same amount of 6-dibutylamino-1,3,5-triazine-2,4-dithiol [Sankyo Kasei product Jisnet D
B] was used.

Comparative Examples 2 to 5 In Examples, except that 6-anilino-1,3,5-triazine-2,4-dithiol was not used, triallyl isocyanurate and organic peroxide were mixed in the following amounts, respectively. Was changed to.

Comparative Example 6 In Comparative Example 2, 6-anilino-1,3,5-triazine-2,4-
Instead of dithiol, the same amount of 1,3,5-triazine-2,4,6-
Trithiol was used.

Comparative Example 7 In the examples, no triallyl isocyanurate was used.

For the vulcanizates obtained in the above examples and each comparative example,
In accordance with JIS K-6301, normal physical properties and compression set (15
(0 ° C., 70 hours) was measured. The results obtained are
The composition is shown in the following table.

From the above results, the following can be said.

(1) The vulcanized product of the chlorinated polyethylene rubber composition according to the present invention has a relatively high tensile strength, and the improvement of compression set is 6-dibutylamino-1,3,5-triazine-2, It is more remarkable than Comparative Example 1 using 4-dithiol.

(2) The vulcanized product of Comparative Example 3 has an improved compression set, but has a marked decrease in tensile strength and elongation.

(3) The vulcanizates of other comparative examples have relatively high tensile strength, but no improvement in compression set is observed.

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Claims (1)

[Claims] 1. A chlorinated polyethylene rubber, 6-anilino-1,
A chlorinated polyethylene rubber composition comprising 3,5-triazine-2,4-dithiol, an organic peroxide and triallyl isocyanurate or triallyl cyanurate.