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Foamed rubber production

A sponge rubber, rubber technology, applied in chemical instruments and methods, transportation and packaging, other chemical processes, etc., can solve the problem that sponge rubber does not achieve high expansion rate, compression permanent strain appearance and shape maintenance processability and foamability And other issues

Inactive Publication Date: 2005-04-06
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, sufficient processability and foamability with high expansion rate, compression set, appearance and shape retention have not been achieved in the sponge rubber known in the art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7 and comparative example 1～3

[0059] As the ethylene-α-olefin non-conjugated diene copolymer, ethylene-propylene-5-ethylene-2-norbornene copolymer rubber (referred to as "copolymer rubber" in Table 1) shown in Table 1 was used rubber.

[0060] Carbon black manufactured by ASAHI CARBON Co., Ltd. under the trade name Asahi 50HG was used.

[0061] A process oil manufactured by Idemitsu Kosan Co., Ltd. under the trade name PS 430 was used.

[0062] Use 4,4'-oxybis(benzenesulfonylhydrazide) (referred to as "Y" in Table 1) with a particle diameter of 13 μm in terms of the median diameter or 4,4'-oxybis(benzenesulfonyl hydrazide) with a particle diameter of 4 μm in terms of the median diameter. (Benzenesulfonylhydrazide) (marked as "Z" in Table 1) was used as a blowing agent.

[0063] Use containing 32% (weight) M (MBT), 32% (weight) BZ (ZnBDC), 2% (weight) TE (TeEDC), 21% (weight) PZ (ZnMDC) and 13% (weight) disulfide Lin's mixture acts as a crosslinking accelerator (vulcanization accelerator).

[0064] Tabl...

Embodiment 8 and 9 and comparative example 4～9

[0080] Use ethylene-propylene-5-ethylidene-2-norbornene-dicyclopentadiene copolymer rubber (referred to as "copolymer rubber" in Table 3) as the ethylene-α-olefin non-conjugated diene copolymer rubber.

[0081] For carbon black, process oil, crosslinking accelerator (vulcanization accelerator) and blowing agent, the same substances as in Examples 1 to 7 were used.

[0082] Table 4 summarizes the ingredients used and their mixing ratios (parts by weight).

[0083] The copolymer rubber shown in Table 4, carbon black, aluminum silicate, process oil, zinc oxide and stearic acid were mixed with a 1.5 liter Banbury mixer to obtain a mixture.

[0084] This mixture was mixed with calcium oxide, a blowing agent, sulfur and a crosslinking accelerator (vulcanization accelerator) shown in Table 4 using an 8-inch open roller to obtain a rubber composition.

[0085] The rubber composition was extruded with a 45 mm extruder equipped with a tubular die (inner diameter = 10 mm, thickness = 1...

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Abstract

There are provided: (i) a process for producing a foamed rubber having a density of less than 0.50 g / cm<3>, which comprises the step of foaming and cross-linking a rubber composition containing (i) an ethylene-alpha-olefin copolymer rubber, (ii) a vulcanizing agent and (iii) a foaming agent having a particle diameter of not more than 10 mum in terms of a median diameter, wherein an amount of the foaming agent exceeds 4.0 parts by weight per 100 parts by weight of the ethylene-alpha-olefin copolymer rubber, and (ii) a sealing material for car use, which comprises the foamed rubber obtained by the above-mentioned process for producing a foamed rubber.

Description

technical field [0001] The present invention relates to a method for producing lightweight sponge rubber having excellent compression set, appearance and shape maintaining properties; a process for producing lightweight sponge rubber; and an automotive sealing material comprising any one of the sponge rubber obtained by these processes. Background technique [0002] Since ethylene-α-olefin non-conjugated diene copolymer rubber has excellent properties such as corrosion resistance, heat resistance and ozone resistance, the rubber has been used for automotive parts such as sealing materials (eg, weather strips). This sealing material can be made of sponge rubber obtained by foaming and crosslinking a rubber composition containing the copolymer rubber, a foaming agent and a crosslinking agent. [0003] Sponge rubber used for sealing materials needs to have the following properties: (1) excellent compression permanent strain, because the sealing material must maintain its high s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/00C08J9/10C09K3/10
CPCC09K2200/0617C08J9/0066C08J2323/16C09K2003/1037C08J9/104C09K3/10C09K2200/062
Inventor 小柴淳一
Owner SUMITOMO CHEM CO LTD