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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, it generates a lot of dynamic heat, and may not be suitable for applications used in vibrating parts, such as seals used in vibrating parts. piece usage, etc.

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

Embodiment

[0112] Hereinafter, an Example and a comparative example are given, and this invention is demonstrated concretely. Hereinafter, unless otherwise stated, "parts" are based on weight. In addition, tests and evaluations are as follows.

[0113] Carboxyl content

[0114] Add 100mL of 2-butanone to the carboxyl group-containing highly saturated nitrile rubber of 2mm square of 0.2g, after stirring for 16 hours, add 20mL of ethanol and 10mL of water, carry out the 0.02N aqueous ethanol solution using potassium hydroxide while stirring, Titration using thymolphthalein as an indicator at room temperature can thereby obtain the number of moles of carboxyl groups with respect to 100 g of rubber (unit ephr).

[0115] 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 was measured by the following method.

[0117] That is, the content ratio of t...

manufacture example 1

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

[0130] In the reactor, 220 parts of ion-exchanged water, 5 parts of 10% sodium dodecylbenzenesulfonate aqueous solution, 37 parts of acrylonitrile, 4 parts of mono-n-butyl maleate and 0.75 parts of tertiary dodecyl mercaptan (molecular weight regulator), and after substituting the internal gas with nitrogen three times, 57 parts of 1,3-butadiene were added. Then, keep the reactor at 10°C, add 0.06 parts of cumene hydroperoxide (polymerization initiator), an appropriate amount of reducing agent and chelating agent, continue the polymerization reaction while stirring, and reach 40% and 60% at the polymerization conversion rate At the moment, add 1 part of mono-n-butyl maleate, respectively, and when the polymerization conversion rate reaches 85%, add 0.1 part of hydroquinone aqueous solution (polymerization terminator) with a concentration of 10% by weight to terminate ...

manufacture example 2

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

[0134] In the reactor, 180 parts of ion-exchanged water, 25 parts of 10% sodium dodecylbenzenesulfonate aqueous solution, 23 parts of acrylonitrile, 6.5 parts of mono-n-butyl maleate, 30.5 parts methoxyethyl acrylate and 0.65 parts of tert-dodecyl mercaptan (molecular weight regulator), and after replacing the internal gas with nitrogen three times, 40 parts of 1,3-butadiene were added. Then, keep the reactor at 10°C, add 0.06 parts of cumene hydroperoxide (polymerization initiator), an appropriate amount of reducing agent and chelating agent, continue the polymerization reaction while stirring, and when the polymerization conversion rate reaches 83%, The polymerization reaction was terminated by adding 0.1 part of a hydroquinone aqueous solution (polymerization terminator) having a concentration of 10% by weight. Next, residual monomers were removed at a water tempe...

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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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