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Process for producing thermoplastic elastomer composition

A thermoplastic elastomer and a technology for a manufacturing method, which are applied in the field of manufacturing thermoplastic elastomer compositions, can solve the problems of high hardness and low flexibility, and achieve the effects of excellent flexural fatigue resistance and cold resistance, and stable manufacturing.

Active Publication Date: 2021-07-16
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyamide-based polymers have high hardness and low flexibility, so in order to improve these characteristics, methods of mixing rubber in polyamide-based polymers are known, and various rubber blending techniques have been proposed

Method used

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  • Process for producing thermoplastic elastomer composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0079] Hereinafter, the present invention will be described in further detail based on examples, but the present invention is not limited to these examples. In addition, in the following, unless otherwise stated, "parts" are based on weight. In addition, the tests and evaluations are as follows.

[0080] Iodine value

[0081] The iodine value of the highly saturated nitrile rubber is measured according to JIS K 6235.

[0082] Carboxyl content

[0083] Add 100ml of 2-butanone to 0.2g of 2mm square highly saturated nitrile rubber, after stirring for 16 hours, add 20ml of ethanol and 10ml of water, stir and use 0.02N aqueous ethanol solution of potassium hydroxide at room temperature for 100%. The carboxyl group content (unit: ephr) was determined as the number of moles of carboxyl groups with respect to 100 g of highly saturated nitrile rubber by titrating phenolphthalein as an indicator.

[0084] Content ratio of each monomer unit constituting highly saturated nitrile...

Synthetic example 1

[0101] Synthesis Example 1 (Synthesis of Highly Saturated Nitrile Rubber (A-1))

[0102] 180 parts of ion-exchanged water, 25 parts of sodium dodecylbenzenesulfonate aqueous solution with a concentration of 10% by weight, 37 parts of acrylonitrile, 6 parts of mono-n-butyl maleate and 0.5 parts of of tert-dodecyl mercaptan (molecular weight regulator), and after replacing the internal gas with nitrogen three times, 57 parts of 1,3-butadiene was added. The reactor was kept at 5°C, 0.1 part of cumene hydroperoxide (polymerization initiator), an appropriate amount of reducing agent and chelating agent were added, and the polymerization reaction was continued with stirring. Next, when the polymerization addition rate reached 80%, 0.1 part of a hydroquinone aqueous solution (polymerization terminator) having a concentration of 10% by weight was added to terminate the polymerization reaction, and then residual monomers were removed using a rotary evaporator with a water temperature...

Synthetic example 2

[0105] Synthesis Example 2 (Synthesis of Highly Saturated Nitrile Rubber (A-2))

[0106] 180 parts of ion-exchanged water, 25 parts of sodium dodecylbenzenesulfonate aqueous solution with a concentration of 10% by weight, 20 parts of acrylonitrile, 4.5 parts of mono-n-butyl maleate, 35.5 parts of of methoxyethyl acrylate and 0.5 parts of tert-dodecyl mercaptan (molecular weight regulator), and after replacing the internal gas with nitrogen three times, 40 parts of 1,3-butadiene was added. Next, the reactor was kept at 5° C., 0.1 part of cumene hydroperoxide (polymerization initiator) was added, and the polymerization reaction was continued with stirring. When the polymerization conversion rate reached 80%, 0.1 part of 10% by weight of cumene was added. A hydroquinone aqueous solution (polymerization terminator) was used to terminate the polymerization reaction. Next, residual monomers were removed under reduced pressure at a water temperature of 60° C. to obtain a latex (so...

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Abstract

The present invention provides a method for producing a thermoplastic elastomer composition, which has the function of dynamically crosslinking a highly saturated nitrile rubber (A) in the presence of a polyamide-based polymer (B) and a polyamine crosslinking agent (C). In the step, the highly saturated nitrile rubber (A) has an α,β-ethylenically unsaturated nitrile monomer unit and an α,β-ethylenically unsaturated dicarboxylic acid monoester monomer unit, and has an iodine value of 120 or less.

Description

technical field [0001] The present invention relates to a method for producing a thermoplastic elastomer composition. Background technique [0002] Polyamide-based polymers are known as thermoplastic elastomer polymers having excellent heat resistance and moderate flexibility. However, polyamide-based polymers have high hardness and low flexibility. In order to improve these properties, methods of mixing rubber with polyamide-based polymers are known, and various rubber blending techniques have been proposed. [0003] Especially in recent years, in order to soften the polyamide polymer by mixing rubber and improve the mechanical properties such as elongation and compression set, it has been proposed to finely disperse rubber particles in the matrix of the polyamide polymer. A technique for cross-linking the rubber particles. [0004] For example, Patent Document 1 proposes a thermoplastic elastomer composition obtained by mixing a polyamide-based polymer with a rubber in w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08K5/16C08L9/02C08L77/00
CPCC08J3/24C08L9/02C08J2409/02C08J2377/02C08J2377/06C08L77/02C08L77/06C08C19/02C08F236/06C08F220/44C08F222/16C08F220/281C08F220/1804C08F220/06C08K5/0016C08K5/16C08L77/00C08C19/36C08L2207/04C08L2312/00
Inventor 中岛友则
Owner ZEON CORP