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

A technology of neoprene and its manufacturing method, which is applied in the field of sulfur-modified neoprene and its manufacture, sulfur-modified neoprene composition, vulcanized compound and molded products, and can solve the problems of shortened product life, rubber heating and deterioration, etc. question

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] 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.

[0104] To the obtained polymerization solu...

Embodiment 2

[0116] The amount of diisopropyl xanthate disulfide added as a plasticizer was changed from 2 parts by mass to 1 part by mass, and the amount of sodium dibenzyldithiocarbamate added was changed from 2 parts by mass to 4 parts by mass , except that, raw rubber was obtained by the same method as in Example 1.

Embodiment 3

[0118] The amount of N-cyclohexyl-2-benzothiazole sulfenamide as a plasticizer was changed from 2 parts by mass to 3 parts by mass, and the amount of sodium dibenzyl dithiocarbamate was changed from 2 parts by mass to Raw rubber was obtained by the same method as in Example 1 except that 1 part by mass.

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PUM

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Abstract

A sulfur-modified chloroprene rubber which has a functional group A that is represented by general formula (A) and is positioned at an end of the molecule and a functional group B that is represented by general formula (B) and is positioned at an end of the molecule, and which is configured such that: the mass ratio B/A of the content of the functional group B to the content of the functional group A is from 0.10 to 12.00; and the total amount of the functional group A and the functional group B is from 0.15% by mass to 1.00% by mass. (In formula (A), Ra represents a hydrogen atom or an optionally substituted alkyl group having 1-4 carbon atoms.) (In formula (B), each of Rb1 and Rb2 independently represents an optionally substituted alkyl group or an optionally substituted aryl group).

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): C08F8/34C08K5/38C08K5/39C08L15/00
CPCC08K5/38C08K5/39C08C19/22C08C19/20C08F136/18C08L15/00C08F2/24
Inventor 近藤敦典砂田贵史
Owner DENKA CO LTD
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