Nitrile rubber composition and crosslinked rubber product

A technology of nitrile rubber and composition, which is applied in the field of rubber cross-linked products, and can solve the problems of large dynamic heat generation, etc.

Inactive Publication Date: 2018-03-27
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cross-linked rubber obtained by using the nitrile rubber composition disclosed in Patent Document 1 has good physical properties in the normal state

Method used

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  • Nitrile rubber composition and crosslinked rubber product
  • Nitrile rubber composition and crosslinked rubber product

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0111] Example

[0112] Hereinafter, examples and comparative examples are given to specifically explain the present invention. Unless otherwise specified below, "parts" are based on weight. In addition, the test and evaluation are as follows.

[0113] Carboxyl content

[0114] Add 100mL of 2-butanone to 0.2g of 2mm square carboxyl group-containing highly saturated nitrile rubber. After stirring for 16 hours, add 20mL of ethanol and 10mL of water. While stirring, use a 0.02N aqueous ethanol solution of potassium hydroxide, Titration at room temperature using thymolphthalein as an indicator is determined as the number of moles of carboxyl groups per 100 g of rubber (unit ephr).

[0115] The composition of carboxyl-containing highly saturated nitrile rubber

[0116] The content ratio of each monomer unit constituting the carboxyl group-containing highly saturated nitrile rubber is measured by the following method.

[0117] That is, the content ratio of maleic acid mono-n-butyl ester u...

Example Embodiment

[0129] Production Example 1 (Production of carboxyl group-containing highly saturated nitrile rubber (a1))

[0130] In the reactor, sequentially add 220 parts of ion exchange water, 5 parts of 10% concentration of sodium dodecylbenzene sulfonate aqueous solution, 37 parts of acrylonitrile, 4 parts of mono-n-butyl maleate and 0.75 parts After replacing the internal gas with nitrogen three times, 57 parts of 1,3-butadiene was added. Then, keep the reactor at 10°C, add 0.06 parts of cumene hydroperoxide (polymerization initiator), appropriate amount of reducing agent and chelating agent, and continue the polymerization reaction while stirring. The polymerization conversion rate reaches 40% and 60%. At the time when 1 part of mono-n-butyl maleate was added, when the polymerization conversion reached 85%, 0.1 part of a hydroquinone aqueous solution (polymerization terminator) with a concentration of 10% by weight was added to terminate the polymerization reaction. Next, residual mon...

Example Embodiment

[0133] Production Example 2 (Production of carboxyl group-containing highly saturated nitrile rubber (a2))

[0134] In the reactor, add 180 parts of ion-exchanged water, 25 parts of 10% sodium dodecylbenzene sulfonate aqueous solution, 23 parts of acrylonitrile, 6.5 parts of mono-n-butyl maleate, 30.5 parts After replacing the internal gas with nitrogen three times with methoxyethyl acrylate and 0.65 parts of t-dodecyl mercaptan (molecular weight modifier), 40 parts of 1,3-butadiene were added. Then, the reactor was kept at 10°C, 0.06 parts of cumene hydroperoxide (polymerization initiator), appropriate reducing agent and chelating agent were added, and the polymerization reaction was continued while stirring. When the polymerization conversion rate reached 83%, 0.1 part of a hydroquinone aqueous solution (polymerization terminator) with a concentration of 10% by weight was added to terminate the polymerization reaction. Next, residual monomers were removed at a water temperatu...

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Abstract

Provided is a nitrile rubber composition characterized by containing carboxyl group-containing highly saturated nitrile rubber (a) that contains 5-60 wt% of alpha,beta-ethylenic unsaturated nitrile monomer units and has an iodine value of 120 or less, silica (b) having a specific surface area of 70 m2/g or less, and a polyamine crosslinking agent (c), wherein the content of the polyamine crosslinking agent (c) is 0.1-20 parts by weight per 100 parts by weight of the carboxyl group-containing highly saturated nitrile rubber (a).

Description

technical field [0001] The present invention relates to a nitrile rubber composition capable of forming a rubber cross-linked product having good normal physical properties and little dynamic heat generation, and a rubber cross-linked product obtained using such a nitrile rubber composition. Background technique [0002] Nitrile rubber (acrylonitrile-butadiene copolymer rubber) has been used as a material for automotive rubber parts such as hoses and inner tubes by making use of its oil resistance, mechanical properties, and chemical resistance. Hydrogenated nitrile rubber (hydrogenated acrylonitrile-butadiene copolymer rubber) in which carbon-carbon double bonds in the polymer main chain are hydrogenated is used for rubber parts such as belts, hoses, and separators because of its further excellent heat resistance. [0003] As such a nitrile rubber composition, for example, Patent Document 1 discloses a nitrile copolymer rubber (A) containing an iodine value of 20 to 80 and ...

Claims

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Application Information

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IPC IPC(8): C08L9/02C08F236/12C08K3/36C08K5/17C08K5/54
CPCC08F236/12C08K5/17C08K5/54C08L9/02C08L15/005C08K3/36C08K2201/006C08K5/0016C08K5/544C08K5/12C08K5/11C08K5/5435C08K5/0025C08K5/175
Inventor 茂崎紫穗
Owner ZEON CORP
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