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Acrylic rubber

A technology of acrylic rubber and olefin, applied in the field of acrylic rubber, can solve the problem of insufficient improvement of compression set resistance and achieve good results in normal physical properties

Inactive Publication Date: 2019-09-27
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the acrylic rubber composition described in this patent document 1, although it is possible to provide a rubber cross-linked product with compression set resistance improved to some extent, the improvement effect of compression set resistance is not sufficient. Applications that require further improvement in compression set resistance

Method used

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  • Acrylic rubber

Examples

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Embodiment

[0131] Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. In addition, unless otherwise specified, "parts" in each example are based on weight.

[0132] Various physical properties were evaluated according to the following methods.

[0133] [Residual Calcium Amount]

[0134]Sulfuric acid and nitric acid were added to acrylic rubber, heated to perform wet decomposition, and then diluted appropriately to obtain a sample. Using the obtained sample, an ICP-AES device (SPS-5000: manufactured by Seiko Instruments Inc. ), the amount of calcium ions was measured by the internal standard standard curve method, thus obtaining the amount of residual calcium.

[0135] [Polymer pH]

[0136] The polymer pH of the acrylic rubber was measured according to the following procedure. That is, first, an acrylic rubber is formed into a sheet using a roller, the sheet-shaped acrylic rubber is cut into pieces with scissors, and 6...

manufacture example 1

[0149] In the polymerization reactor with thermometer, stirring device, nitrogen introduction pipe and decompression device, add 200 parts of pure water, 69.8 parts of ethyl acrylate, 29.0 parts of n-butyl acrylate, 1.2 parts of fumaric acid mono-n Butyl ester, 2.4 parts of sodium lauryl sulfate (trade name "Emal 2FG", manufactured by Kao Corporation.) as a surfactant. Then, degassing and nitrogen replacement based on decompression were repeated, and after oxygen was fully removed, 0.00014 parts of sodium formaldehyde sulfoxylate and 0.25 parts of p-terpane hydroperoxide were added to start emulsion polymerization at normal pressure and temperature. , continue the reaction until the polymerization conversion rate reaches 95%, thus obtaining the emulsion polymerization liquid. The pH of the obtained emulsion polymerization solution was 4.8, and the solid content concentration was 32% by weight.

[0150] Then, the obtained emulsion polymerization solution was transferred to a c...

manufacture example 2

[0154] A solid acrylic rubber (A2) was obtained in the same manner as in Production Example 1 except that the number of water washings of the coagulated water-containing aggregate was changed from 2 times to 3 times. The composition of the obtained acrylic rubber (A2) was 69.8% by weight of ethyl acrylate unit, 29% by weight of n-butyl acrylate unit, and 1.2% by weight of mono-n-butyl fumarate unit. In addition, the residual calcium content of the acrylic rubber (A2) was 2.3 ppm by weight, and the polymer pH was 6.0.

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Abstract

Provided is an acrylic rubber which has a residual calcium content of 60 weight ppm or less and has a polymer pH of 7.0 or less, the acrylic rubber preferably containing carboxyl groups.

Description

technical field [0001] The present invention relates to acrylic rubber. More specifically, it relates to an acrylic rubber capable of forming a rubber cross-linked product having good normal physical properties and excellent compression set resistance, and capable of effectively suppressing generation of bubbles when crosslinked by steam crosslinking. . Background technique [0002] Acrylic rubber is a polymer mainly composed of acrylate, and is generally known as a rubber excellent in heat resistance, oil resistance, and ozone resistance, and is widely used in automobile-related fields and the like. [0003] For example, Patent Document 1 discloses an acrylic rubber composition containing 4 to 30 parts by weight of calcium oxide based on 100 parts by weight of carboxyl group-containing acrylic rubber. According to this patent document 1, there is provided an acrylic composition having high coking stability and not degrading physical properties during steam vulcanization. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/10C08K5/17C08L33/00
CPCC08C1/14C08F6/22C08K3/04C08K5/17C08F220/1802C08F220/1804C08F222/16C08L33/062C08K5/09C08K5/0025C08F20/10C08K5/0016C08K5/3462C08L33/00C08F2810/20
Inventor 小岛启佑江尻和弘增田浩文
Owner ZEON CORP
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