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Nitrile rubber composition

A technology of nitrile-butadiene rubber and composition, applied in the field of nitrile-butadiene rubber composition, can solve the problems of low torque, large rubber volume change rate, etc., and achieve the effect of suppressing the volume change rate

Active Publication Date: 2016-03-09
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the vulcanization of the nitrile rubber composition formed by containing only the reaction product of diphenylamine, styrene and 2,4,4-trimethylpentene as an anti-aging agent disclosed in the examples of this prior document Although the vulcanized rubber product obtained by molding satisfies muddy water resistance, sealing performance, and low torque performance, as shown in Comparative Example 2 described later, the volume change rate of the rubber when washed with water after being exposed to antifreeze Great, needs improvement in this area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]

[0031] After kneading the above mixed components using a kneader and an open roll, and measuring the raw material properties (Mooney viscosity, scorch time), the kneaded product was subjected to press vulcanization at 170°C for 10 minutes and open curing at 150°C for 30 minutes. Formula vulcanization, produced 250 × 120 × 2mm and 50 × 20 × 0.2mm test pieces. Using the obtained test pieces, measurements of normal physical properties and immersion tests were performed.

[0032] Billet properties:

[0033] Based on JISK6300-1:2001 (Mooney test) corresponding to ISO289-1:1994 and ISO289-2:1994;

[0034] Measure the minimum Mooney viscosity and scorch time T5 at 125°C;

[0035] From the perspective of the stability of the billet and the vulcanization formability, the scorch time is preferably more than 6 minutes;

[0036] Normal physical properties:

[0037] Based on JISK6253:1997 corresponding to ISO7619:2004 (hardness; durometer A instantaneous);

[0038] Based on ...

Embodiment 2

[0049] In Example 1, the amount of N,N'-di-2-naphthyl-p-phenylenediamine was changed to 1 part by weight and used.

Embodiment 3

[0051] In Example 1, instead of N,N'-di-2-naphthyl-p-phenylenediamine, 1 part by weight of dilauryl thiodipropionate (Nokrack 400 manufactured by Ouchi Shinko Chemical Co., Ltd.) was used.

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Abstract

A nitrile rubber composition which contains 5 to 50 parts by weight of carbon black, 5 to 60 parts by weight of graphite having a mean particle diameter of 5[mu]m or less, 5 to 50 parts by weight of a conductive carbon material other than these, and further contains, as antioxidants, 1 to 5 parts by weight of an alkylated diphenylamine consisting of a reaction product of diphenylamine with styrene and 2,4,4-trimethylpentene and 0.5 to 2.5 parts by weight of N,N'-di-2-naphthyl-p-phenylenediamine or dilauryl thiodipropionate, each quantity being relative to 100 parts by weight of nitrile rubber. This nitrile rubber composition can yield a vulcanization-molded product that not only keeps characteristics as conductive material but also satisfies characteristics requisite to an oil seal for a rolling bearing for an automobile or the like, namely, muddy water resistance, sealing properties and low-torque properties, and that exhibits a suppressed rubber volume change even when has been exposed to an antifreezing agent and then washed with water.

Description

technical field [0001] The present invention relates to nitrile rubber compositions. More specifically, it relates to a nitrile rubber composition capable of imparting a vulcanized molded article excellent in muddy water resistance, low torque resistance, and the like. Background technique [0002] From the perspective of global environmental problems in recent years, weight reduction and fuel consumption reduction are urgently desired in the automobile industry. Responding to this demand, low torque is required for rotating system components such as oil seals among automobile parts due to increased fuel consumption of automobiles, and low torque is also desired for rolling bearings (hub bearings) for wheels. On the other hand, since rolling bearings for wheels are used outdoors, and in extreme cases, they are also used in harsh environments such as exposure to muddy water, so muddy water resistance is also required for their elastic parts (oil seals), but muddy water resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02C08K3/04C08K5/18C08K5/372F16C33/72F16J15/3284
CPCC08K5/18C08K5/372C08L9/02F16C33/72F16J15/3284F16C2208/10F16C41/002C08K2201/014C08K3/04
Inventor 矢本博光小宫英治青柳裕一古川智规
Owner NOK CORP
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