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Sulfur-modified chloroprene rubber and method for producing same, sulfur-modified chloroprene rubber composition, vulcanizate, and molded article

A chloroprene rubber and a manufacturing method technology are applied in the fields of sulfur-modified chloroprene rubber and its manufacture, sulfur-modified chloroprene rubber compositions, sulfides and molded products, and can solve the problem of rubber heating, deterioration, shortening of product life, etc. question

Active Publication Date: 2021-07-23
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These products undergo repeated deformation and recovery due to dynamic stress, so there are problems such as deterioration of the rubber itself due to heat generation, or shortened product life.

Method used

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  • Sulfur-modified chloroprene rubber and method for producing same, sulfur-modified chloroprene rubber composition, vulcanizate, and molded article
  • Sulfur-modified chloroprene rubber and method for producing same, sulfur-modified chloroprene rubber composition, vulcanizate, and molded article
  • Sulfur-modified chloroprene rubber and method for producing same, sulfur-modified chloroprene rubber composition, vulcanizate, and molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] 100 parts by mass of chloroprene, 0.55 parts by mass of sulfur, 120 parts by mass of pure water, 4.00 parts by mass of disproportionated potassium abietate (manufactured by HARIMA CHEMICALS, INC.), and 0.60 parts by mass of sodium hydroxide were added to a polymerization tank with an inner volume of 30 L. , and 0.6 parts by mass of sodium salt of β-naphthalenesulfonic acid formaldehyde condensate (trade name "DEMOL N": manufactured by Kao Corporation). The pH of the aqueous emulsion before the start of polymerization was 12.8. After adding 0.1 parts by mass of potassium persulfate as a polymerization initiator, emulsion polymerization was performed at a polymerization temperature of 40° C. under a nitrogen stream. When the conversion ratio became 85%, 0.05 parts by mass of diethylhydroxylamine was added as a polymerization terminator to terminate the polymerization, thereby obtaining a polymerization solution of chloroprene.

[0110] To the obtained polymerization solu...

Embodiment 2

[0122] The amount of N-cyclohexyl-2-benzothiazole sulfenamide as a plasticizer was changed from 1 part by mass to 0.5 parts by mass, and the amount of tetrabenzylthiuram disulfide was changed from 4 parts by mass to Raw rubber was obtained by the same method as in Example 1 except that 8 parts by mass.

Embodiment 3

[0124] The amount of N-cyclohexyl-2-benzothiazole sulfenamide as a plasticizer was changed from 1 part by mass to 2 parts by mass, and the amount of tetrabenzylthiuram disulfide added was changed from 4 parts by mass to Raw rubber was obtained by the same method as in Example 1 except that 2 parts by mass.

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PUM

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Abstract

Provided is a sulfur-modified chloroprene rubber having a functional group A represented by general formula (A) and located at a terminal of the molecule, and a functional group B represented by general formula (B) and at a terminal of the molecule, wherein the mass ratio B / A of the content of functional group B to the content of functional group A is 12.00 or less, and the total amount of functional group A and functional group B is 0.10-1.00 mass%. (In formula (A), Ra1 and Ra2 each independently represent a hydrogen atom, a halogen atom, a hydroxy group, an alkoxy group, a carboxy group, a carboxylate group, a cyano group, an alkyl group which may have a substituent, or an arylthio group which may have a substituent, and Ra1 and Ra2 may bond with each other to form a ring which may have a substituent.) (In formula (B), Rb1 and Rb2 each independently represent an alkyl group which may have a substituent, or an aryl group which may have a substituent).

Description

technical field [0001] The present invention relates to sulfur-modified chloroprene rubber, a method for producing the same, a sulfur-modified chloroprene rubber composition, a vulcanized product, and a molded article. Background technique [0002] Sulfur-modified chloroprene rubber effectively utilizes the excellent dynamic characteristics of vulcanizates, and thus is widely used as transmission belts or conveyor belts for general industries; air springs for automobiles; anti-vibration rubber: sponge and other materials. Since these products undergo repeated deformation and recovery due to dynamic stress, there is a problem that the rubber itself generates heat and deteriorates, or that the life of the product is shortened. Therefore, the development of sulfur-modified chloroprene rubber with reduced heat generation has been strongly desired. [0003] As a technique for reducing the exothermic properties of rubber, it is known to contain an elastomer such as acrylonitrile-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/34C08K5/39C08K5/47C08L15/02
CPCC08K5/47C08C19/20C08F136/18C08C19/22C08K5/40C08L15/02C08F2/24
Inventor 近藤敦典砂田贵史
Owner DENKA CO LTD
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