Nitrile rubber composition, and rubber cross-linked product

A technology of nitrile rubber and composition, which is applied in the field of rubber cross-linked products, can solve the problems of insufficient fluidity and low yield, and achieve the effects of good yield, excellent fluidity, and excellent compression permanent strain resistance

Active Publication Date: 2015-08-19
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fluidity of the nitrile rubber composition described in the above-mentioned Patent Document 1 is not sufficient at the time of crosslinking. Therefore, in order to obtain a rubber part having a complicated shape, crosslinking is carried out simultaneously with molding in a molding die having a complicated shape. In this case, it cannot flow to every corner of the molding die, so there is a problem that rubber parts with complex shapes cannot be obtained with good yield (less occurrence of defective products)

Method used

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  • Nitrile rubber composition, and rubber cross-linked product
  • Nitrile rubber composition, and rubber cross-linked product

Examples

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Effect test

Embodiment

[0091] Examples and comparative examples are given below to describe the present invention more specifically, but the present invention is not limited to these examples. Hereinafter, unless otherwise stated, "parts" are based on weight. The test or evaluation methods of physical properties and characteristics are as follows.

[0092] Composition of highly saturated nitrile rubber containing carboxyl groups

[0093] The content ratio of each monomer unit constituting the carboxyl group-containing highly saturated nitrile rubber was measured by the following method.

[0094] That is, the content ratio of mono-n-butyl maleate unit was calculated as follows: 100 ml of 2-butanone was added to 0.2 g of carboxyl group-containing highly saturated nitrile rubber of 2 mm square and stirred for 16 hours, then 20 ml of ethanol and 10 ml of water were added, and stirred While using the 0.02N aqueous ethanol solution of potassium hydroxide, at room temperature, by titration with thymolp...

Synthetic example 1

[0107] Synthesis Example 1 (Synthesis of carboxyl group-containing highly saturated nitrile rubber (A1))

[0108] In the reactor, 180 parts of ion-exchanged water, 25 parts of sodium dodecylbenzenesulfonate aqueous solution with a concentration of 10% by weight, 36 parts of acrylonitrile, 6 parts of mono-n-butyl maleate, and tert-dodecyl After replacing 0.5 parts of mercaptan (molecular weight modifier) ​​with nitrogen inside the gas three times, 58 parts of 1,3-butadiene were added. Next, keep the reactor at 5°C, add 0.1 part of cumene hydroperoxide (polymerization initiator), and continue the polymerization reaction while stirring, and add a hydroquinone aqueous solution with a concentration of 10% by weight when the polymerization conversion rate reaches 85%. (polymerization stopper) 0.1 part to stop the polymerization reaction. Next, residual monomers were removed under reduced pressure at a water temperature of 60° C. to obtain a latex of nitrile rubber (solid content ...

Embodiment 1

[0113] To 100 parts of the carboxyl group-containing highly saturated nitrile rubber (A1) obtained in Synthesis Example 1, liquid nitrile rubber (trade name "Nipol-1312", manufactured by Japan Zeon Co., Ltd., acrylonitrile content 28% by weight, temperature 70°C, 5 parts of FEF carbon black (trade name "Seast SO", manufactured by TOKAI CARBON Co., Ltd.), 40 parts of trimellitic acid tris(2-ethyl Hexyl) ester (trade name "Adekacizer C-8", manufactured by ADEKA Corporation, plasticizer) 5 parts, 4,4'-bis-(α,α'-dimethylbenzyl) diphenylamine (trade name "Novolac CD", Ouchi Shinko Chemical Co., Ltd., anti-aging agent) 1.5 parts, stearic acid (lubricant) 1 part, polyoxyethylene alkyl ether phosphate (trade name "PHOSPHANOL RL210", Toho Chemical Industry Company-manufactured, processing aid) 1 part, and kneaded at 110°C for 5 minutes. Next, the resulting mixture was transferred to a roller machine heated to a temperature of 40°C, and 1,8-diazabicyclo[5,4,0]-undecene-7 (DBU) (trade n...

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Abstract

Provided is a nitrile rubber composition which contains: a carboxyl group-containing nitrile rubber (A); liquid nitrile rubber (B); and a polyamine cross-linking agent (C). The iodine value of the carboxyl group-containing nitrile rubber (A) in this nitrile rubber composition is preferably 120 or less. Furthermore, the carboxyl group-containing nitrile rubber (A) in this nitrile rubber composition preferably contains: 5-60 mass% of an α,β-ethylenically unsaturated nitrile monomer unit; 0.1-20 mass% of a carboxyl group-containing monomer unit; and 15-94.9 mass% of a conjugated diene monomer unit.

Description

technical field [0001] The present invention relates to a nitrile rubber composition imparting processability (especially fluidity when molding and crosslinking are carried out simultaneously) and a crosslinked rubber excellent in compression set resistance, and crosslinked rubber obtained using the nitrile rubber composition things. Background technique [0002] Conventionally, nitrile rubber (acrylonitrile-butadiene copolymer rubber) has been used as a material for automotive rubber parts such as hoses and tubes due to its oil resistance, mechanical properties, and chemical resistance. In addition, the polymerization of nitrile rubber Hydrogenated nitrile rubber (hydrogenated acrylonitrile-butadiene copolymer rubber) obtained by hydrogenating the carbon-carbon double bond in the main chain is used for rubber parts such as seals, belts, hoses, and diaphragms because of its excellent heat resistance . [0003] As such a nitrile rubber composition, for example, Patent Docum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L13/00C08L9/02C08K5/17
CPCC08L13/00C08L9/02C08K5/17C08L2205/025C08L2312/00
Inventor 坚田有信
Owner ZEON CORP
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