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Xanthogen-modified chloroprene rubber and production method therefor

A technology of chloroprene rubber and chloroprene, which is applied in the field of xanthan-modified chloroprene rubber and its manufacture, can solve the problems of difficult productivity and insufficient dynamic characteristics, and achieve the improvement of dynamic characteristics Effect

Inactive Publication Date: 2015-07-22
TOSOH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the known method of using xanthogen disulfides as a chain transfer agent, the dynamic characteristics are not sufficiently satisfied, and in the method of copolymerizing sulfur, although the dynamic characteristics are sufficiently improved, it is necessary to After installing the peptization process for adjusting the viscosity, there are difficulties in productivity

Method used

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  • Xanthogen-modified chloroprene rubber and production method therefor
  • Xanthogen-modified chloroprene rubber and production method therefor
  • Xanthogen-modified chloroprene rubber and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] As a monomer mixture, 8 g of diisopropylxanthogen polysulfide represented by the following general formula (4) is added relative to 1000 g of chloroprene (relative to 100 parts by weight of the monomer mixture, diisopropylxanthogen polysulfide The sulfide is 0.8 parts by weight), mixed and stirred with an emulsified aqueous solution of 50 g of potassium salt of abietic acid, 10 g of sodium salt of a condensate of naphthalenesulfonic acid and formaldehyde, 3 g of sodium hydroxide, and 1000 g of water to emulsify it.

[0066]

[0067] (In the formula, x is an integer of 3 to 5.)

[0068] A polymerization catalyst comprising 1 g of potassium persulfate, 0.1 g of sodium anthraquinone-β-sulfonate, and 300 g of water was added thereto at a constant rate by a pump, and emulsion polymerization was performed at 30°C. Emulsion polymerization is carried out by adding a polymerization catalyst until the polymerization conversion rate is 70%, and then adding a polymerization term...

Embodiment 2

[0077] Change the diisopropyl xanthogen polysulfide as chain transfer agent to 5g (relative to 100 weight parts of monomer mixture, diisopropyl xanthogen polysulfide is 0.5 weight part), in addition, with the embodiment 1 was carried out in the same manner to obtain a xanthan-modified chloroprene rubber (0.10 parts by weight of diisopropylxanthogen polysulfide per 100 parts by weight of chloroprene rubber).

[0078] The obtained purified xanthogen-modified chloroprene rubber was subjected to pyrolysis GC / MS in the same manner as in Example 1, and the same results were obtained.

[0079] Mooney viscosity measurement and evaluation of dynamic properties were performed on the obtained xanthan-modified chloroprene rubber. Record the results in Table 1. The loss coefficient (tan δ) was lower than that of the comparative example, and the dynamic characteristics were excellent.

Embodiment 3

[0081] Change the diisopropylxanthogen polysulfide as a chain transfer agent to 4 g (with respect to 100 parts by weight of the monomer mixture, diisopropylxanthogen polysulfide is 0.4 parts by weight) and diethylxanthogen disulfide 1 g of the product (with respect to 100 parts by weight of the monomer mixture, diisopropyl xanthogen polysulfide is 0.1 parts by weight), except that, proceed in the same manner as in Example 1 to obtain xanthan modified chloroprene rubber ( Diisopropylxanthogen polysulfide is 0.08 parts by weight relative to 100 parts by weight of chloroprene rubber).

[0082] The obtained purified xanthogen-modified chloroprene rubber was subjected to pyrolysis GC / MS in the same manner as in Example 1, and the same results were obtained.

[0083] Mooney viscosity measurement and evaluation of dynamic properties were performed on the obtained xanthan-modified chloroprene rubber. Record the results in Table 1. The loss coefficient (tan δ) was lower than that of ...

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Abstract

Provided are a xanthogen-modified chloroprene rubber that maintains the basic characteristics of conventional chloroprene rubber while exhibiting good dynamic characteristics and a production method for said xanthogen-modified chloroprene rubber. The xanthogen-modified chloroprene rubber and the production method therefor are characterized in that the end of a chloroprene rubber molecule comprises a structure that is represented by formula (1). (In the formula, R represents an alkyl group, and x is an integer of 1 or more.)

Description

technical field [0001] The present invention relates to a xanthan-modified chloroprene rubber and a manufacturing method thereof, and in more detail, relates to a xanthan-modified chloroprene rubber with excellent dynamic properties and a manufacturing method thereof. Background technique [0002] Chloroprene rubber is well-balanced in processability, mechanical strength, weather resistance, oil resistance, flame retardancy, and adhesiveness, so it is widely used as a raw material for other industrial parts represented by automobile parts. Especially in the field of transmission belts and the like, it is an issue to effectively conduct the operation of the device and improve the dynamic characteristics (low heat generation) in order to suppress rubber heat generated by vibration. [0003] As a technical solution to this problem while maintaining the physical properties of chloroprene rubber, methods of using xanthogen disulfides as chain transfer agents have been proposed (P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/20C08F2/38C08J3/24C08K5/38C08L15/02
CPCC08F2438/03C08L15/02C08C19/20
Inventor 永谷直人
Owner TOSOH CORP
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