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
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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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