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

A technology of chloroprene rubber and chloroprene, applied to sulfur-modified chloroprene rubber compositions and vulcanized products, molded articles using the vulcanized compounds, and sulfur-modified chloroprene rubber compositions In the manufacturing field, it achieves the effect of reducing heat generation, compression set and excellent wear resistance

Active Publication Date: 2020-07-03
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the above-mentioned Patent Document 3 discloses a technique for improving the abrasion resistance of rubber as well.

Method used

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

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Experimental program
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Embodiment

[0068] Hereinafter, the present technology will be described in more detail based on examples. In addition, the embodiment described below shows an example of the representative embodiment of this technology, and does not limitatively interpret the protection scope of this technology by this.

[0069] [Production of sulfur-modified chloroprene rubber]

[0070]

[0071] (1) Add 100 parts by mass of chloroprene monomer, 0.55 parts by mass of sulfur, 120 parts by mass of pure water, and 4.00 parts by mass of disproportionated potassium abietate (manufactured by Harima Chemicals Co., Ltd.) to a polymerization tank with an inner volume of 30 liters , 0.60 parts by mass of sodium hydroxide, 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 emulsifier before the start of polymerization was 12.8. 0.1 parts by mass of potassium persulfate was added as a polymerizati...

Embodiment 2～13 and comparative example 1～4

[0077] According to the formulations shown in Tables 1 and 2 below, sulfur-modified chloroprene rubber (raw rubber) was obtained by the same method as in Example 1.

[0078] In addition, each material used in this Example is as follows.

[0079] N-tert-butylbenzothiazole-2-sulfenamide: (trade name "Sanceler NS-G" manufactured by Sanshin Chemical Industry Co., Ltd.)

[0080] Diethyl xanthate disulfide: (manufactured by Sigma-Aldrich)

[0081] Tetraethylthiuram disulfide: (trade name "Nocceler TET" manufactured by Ouchi Shinko Chemical Industry Co., Ltd.)

[0082] [Analysis of content of plasticizer (compound represented by chemical formula (1) and chemical formula (2))]

[0083] The content of the compounds represented by the chemical formula (1) and the chemical formula (2) in the sulfur-modified chloroprene rubber was quantified according to the following steps.

[0084] After dissolving 1.5 g of the obtained sulfur-modified polychloroprene rubber in 30 ml of benzene, 60 m...

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Abstract

Provided is a technology for producing a sulfur-modified chloroprene rubber which has excellent compression set and excellent wear resistance, while being reduced in heat generation. Provided is a sulfur-modified chloroprene rubber composition that is obtained by having a sulfur-modified chloroprene rubber, which contains at least a sulfur-modified chloroprene polymer and an emulsifying agent, contain a sulfenamide which may have an arbitrary substituent in an amount of 0.0005-0.01 part by mass per 100 parts by mass of the sulfur-modified chloroprene rubber.

Description

Background technique [0001] Sulfur-modified chloroprene rubber exerts its excellent dynamic characteristics and is widely used as a material for general industrial transmission belts or conveyor belts, air springs for automobiles, anti-vibration rubber, and sponge products. Since these products undergo repeated deformation-recovery due to dynamic stress, there are problems such as deterioration of the rubber itself due to heat generation or shortening of product life. Therefore, development of sulfur-modified chloroprene rubber with reduced heat generation has been strongly desired. [0002] As a technique for reducing the exothermic properties of rubber, there is known a low exothermic rubber composition containing an elastomer such as acrylonitrile-butadiene copolymer rubber that can be crosslinked by an organic peroxide-based crosslinking agent, α , metal salt of β-ethylenically unsaturated carboxylic acid, BET specific surface area is 25m 2 Magnesium oxide and organic pe...

Claims

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Application Information

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IPC IPC(8): C08L11/00C08K5/38C08K5/47C08L11/02
CPCC08K5/38C08K5/47C08L11/00C08L11/02C08F136/18C08F36/18C08C19/20C08L15/00
Inventor 近藤敦典小林直纪阿部靖
Owner DENKA CO LTD
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