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Sulfur modified chloroprene rubber and method for producing same, and molded body

A chloroprene rubber, sulfur modification technology, applied in the direction of mechanical equipment, transmission belt, V-belt, etc., can solve the problems of peeling, shear deformation, shear stress increase, flying out, etc., to improve the bonding performance , the effect of excellent adhesion

Inactive Publication Date: 2014-09-17
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, as these belt products have become more frequently used under high-load conditions and higher temperatures in the operating environment, shear deformation or shear deformation between the core wire and the reinforcing fiber material and the belt main body has The shear stress (shear stress) becomes larger, which causes the problem of flying out from the main body of the belt
[0004] Therefore, in order to solve the problem that the durability life of the belt product is reduced, a technology for firmly bonding the rubber material constituting the belt main body, the core wire and the reinforcing fiber material is urgently required.

Method used

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  • Sulfur modified chloroprene rubber and method for producing same, and molded body
  • Sulfur modified chloroprene rubber and method for producing same, and molded body
  • Sulfur modified chloroprene rubber and method for producing same, and molded body

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0032]

[0033] First, the sulfur-modified chloroprene rubber of the first embodiment of the present invention will be described. In the sulfur-modified chloroprene rubber of this embodiment, in the presence of sulfur, 2-chloro-1,3-butadiene (hereinafter referred to as chloroprene) alone is subjected to emulsion polymerization, or chloroprene The polymer is obtained by emulsion polymerization of olefin and other monomers, and the end of the polymer is modified by tetramethylthiuram disulfide.

[0034] Specifically, the sulfur-modified chloroprene rubber of the present embodiment is obtained by performing a polymerization step and a plasticizing step. The polymerization step is to mix 100 parts by mass of chloroprene with 0.1 to 2.0 mass parts. Parts of sulfur, and if necessary, less than 50 parts by mass of monomers other than chloroprene are mixed, and the emulsion polymerization is carried out until the monomer conversion rate is in the range of 60 to 90%; the plasticizing step...

no. 2 approach

[0092] Next, the molded body of the second embodiment of the present invention will be described. The molded body of this embodiment is formed by molding the sulfur-modified chloroprene rubber of the first embodiment, and embedding core wires or reinforcing fiber materials to form a composite. Since the molded body of the present embodiment uses the sulfur-modified chloroprene rubber of the first embodiment with excellent adhesive performance, the rubber material has excellent adhesiveness with the core wire or the reinforcing fiber material. Therefore, it is suitable for use in rubber products containing reinforced materials such as transmission belts or conveyor belts for automobiles and general industrial use.

[0093] In addition, the adhesive force between the rubber material and the core wire or reinforced fiber material can be measured in accordance with the H test described in ASTM D2138-72. In the "H test", an H-shaped test piece in which a fiber rope is embedded in a v...

Embodiment 1

[0097]

[0098] (a) First, in a polymerization tank with an inner volume of 30 liters, 100 parts by mass of chloroprene (2-chloro-1,3-butadiene), 2,3-dichloro-1,3- Butadiene 3.0 parts by mass, sulfur 0.50 parts by mass, pure water 120 parts by mass, potassium disproportionated rosinate (manufactured by Harima Chemicals Group, Inc.) 3.80 parts by mass, sodium hydroxide 0.59 parts by mass, β-naphthalenesulfonate formaldehyde 0.5 parts by mass of the sodium salt of forest condensate (trade name Demol N: manufactured by Kao), and adjusted to an aqueous emulsion. In addition, the pH of the aqueous emulsion at the start of polymerization was 12.8.

[0099] To this aqueous emulsion, 0.1 parts by mass of potassium persulfate was added as a polymerization initiator, and emulsion polymerization was performed under a nitrogen stream at a polymerization temperature of 40°C. In addition, at the time when the conversion rate became 75%, diethylhydroxylamine was added as a polymerization inhib...

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Abstract

Provided are: a sulfur modified chloroprene rubber that has excellent adhesiveness to core wires and reinforced fiber materials; a method for producing the same; and a molded body. A polymerization step of blending 0.1 to 2.0 parts by mass of sulfur into 100 parts by mass of a 2-chloro-1,3-butadiene and emulsion polymerizing the mixture until the monomer conversion rate is within the range of 60 to 90%, and a plasticization step of adding an aqueous medium dispersion containing 10 to 70 mass% of a tetramethylthiuram disulfide into the reaction liquid after polymerization and modifying the polymer end are performed to obtain a sulfur modified chloroprene rubber for which the 1H-NMR spectrum measured in a deuterated chloroform solvent shows peaks at 3.55 to 3.61 ppm and 3.41 to 3.47 ppm, and the ratio (A / B) of peak area (A) at 3.55 to 3.61 ppm to peak area (B); at 4.2 to 6.5 ppm is 0.05 / 100 to 0.70 / 100.

Description

Technical field [0001] The invention relates to a sulfur-modified chloroprene rubber, a preparation method thereof, and a molded body using the sulfur-modified chloroprene rubber. In detail, it relates to a sulfur-modified chloroprene rubber for rubber products reinforced with fiber materials such as a transmission belt or a conveyor belt, and a preparation method and a molded body thereof. Background technique [0002] Chloroprene rubber is roughly divided into sulfur-modified type and non-sulfur-modified type. The respective characteristics are effectively used to use this chloroprene rubber in various industrial parts such as automobile parts and adhesives. In a wide range of fields. In particular, sulfur-modified chloroprene rubber (sulfur-modified chloroprene rubber) can effectively utilize its excellent dynamic characteristics, so it is suitable for use as transmission belts or conveyor belts used in automotive and industrial applications. s material. [0003] Generally sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/22C08F36/18F16G1/08F16G5/06
CPCC08C19/20F16G5/04C08F36/18F16G1/06C08L11/00C08F2/22
Inventor 小林直纪岸幸代砂田贵史大势元博
Owner DENKA CO LTD
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