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NBR composition for rubber laminated metal

A composition and rubber technology, applied in the direction of rubber layered products, metal layered products, applications, etc., can solve problems such as poor heat resistance, inability to obtain heat-resistant compositions, and increased hardness

Active Publication Date: 2020-07-07
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Regarding the compounding amount of sulfur, it is described that it is 0 to 0.5 parts by weight, preferably 0 to 0.3 parts by weight, and a composition with excellent heat resistance cannot be obtained if the compounding amount is greater than that.
In each example, no sulfur was used, but in Comparative Example 1 in which 2 parts by weight of sulfur was used, not only the heat resistance was poor, but also the increase in hardness was remarkable.

Method used

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  • NBR composition for rubber laminated metal
  • NBR composition for rubber laminated metal
  • NBR composition for rubber laminated metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052]

[0053]

[0054] The above components were kneaded with a kneader and an open roll, and the kneaded product (composition) was vulcanized at 175° C. for 5 minutes to produce a rubber sheet with a thickness of 2 mm. The hardness of this rubber sheet was measured according to JIS K6253.

[0055] Compression test evaluation samples were produced as follows.

[0056] On an SPCC steel plate (thickness 0.6 mm) surface-treated with zinc phosphate, phenolic resin diluted to a solid content concentration of 5% by weight with organic solvents such as methyl ethyl ketone and methanol is obtained so that the coating thickness after drying on the stainless steel plate is Coating was performed to a thickness of 3 μm, and drying was performed at room temperature. The phenolic resin is not particularly limited as long as it can be vulcanized and adhered to NBR, and for example, commercially available Thixon 715 from Dow Chemical Company and the like can be used.

[0057] The ab...

Embodiment 2

[0069] In Example 1, the amount of 4,4'-dithiodimorpholine was changed to 4 parts by weight.

Embodiment 3

[0071] In Example 1, the amount of 4,4'-dithiodimorpholine was changed to 8 parts by weight.

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Abstract

An NBR composition for rubber laminated metal, having mixed therein, 1-3 parts by weight sulfur and 1-15 parts by weight of a disulfide compound such as a 4,4'-dithiodimorpholine, dithiocaprolactum indicated by general formula RN-S-S-NR (RN being a cyclic linking group formed together with an N atom bonded to an S atom), relative to 100 parts by weight NBR. This NBR composition for rubber laminated metals is capable of improving rubber layer protrusion properties, when used as a rubber laminated metal plate, e.g., a brake shim being a laminated composite metal that has been laminated on to a gasket or another metal plate.[0]

Description

technical field [0001] The present invention relates to an NBR composition for rubber-laminated metal. More specifically, it relates to an NBR composition for rubber-laminated metal that forms a rubber layer of a brake shim material or the like. Background technique [0002] Regarding the rubber-laminated metal gasket (gasket) obtained by laminating NBR or hydrogenated NBR on one or both sides of a metal plate, strong compressive stress is applied to the surface of the rubber layer because it is used for fastening between metals. If the rubber cannot withstand this fastening stress and deforms, the intended sealing function cannot be achieved. [0003] In general, in order to improve extrudability, it is practiced to increase the hardness by adding fillers such as carbon black and silica. However, due to the increase in rubber hardness, the kneading processability is deteriorated, and the sealing performance is reduced. Also, even if the crosslink density was increased by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/02B32B15/06B32B25/14C08K3/011C08K3/06C08K5/43F16D65/095
CPCC08K3/06C08K5/43C08L9/02C08K5/44C08K5/40B32B15/06B32B25/14B32B2475/00B32B2605/00C09K3/10C09K2003/1084C09K2200/0213C09K2200/0612F16D65/0006F16D65/097F16D2200/0021F16D2200/0056F16D2200/0078F16J15/102
Inventor 渡边勋武川大起
Owner NOK CORP
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