Open-cell foam of ethylene-propylene-diene rubber

Abstract

Open-cell foam of ethylene-propylene-diene rubber that can convert to open-cell foams at the foaming of EPDM, rather than after the foaming of the same, and can produce low impact resiliency and improved filling capability. After 0.1·40 parts by weight of organic foaming agent, 2-40 parts by weight of inorganic foaming agent, and 2-40 parts by weight of foam auxiliary agent per 100 parts by weight of ethylene-propylene-diene rubber are mixed, the mixture is vulcanized and foamed to thereby produce open-cell foam of ethylene-propylene-diene rubber. This open-cell foam of ethylene-propylene-diene rubber has low impact resilience and good sealing performance so that it can be used as sealing materials of a variety of industrial products.

Description

technical field [0001] The invention relates to an EPDM continuous-cell foam, in particular to an EPDM continuous-cell foam suitable for use as a sealing material for various industrial products. Background technique [0002] Conventionally, as a sealing material for various industrial products, an EPDM foam obtained by foaming ethylene-propylene-diene rubber (hereinafter referred to as EPDM) with a foaming agent is known from the viewpoint of durability. [0003] The blowing agent that makes described EPDM foam, can use N-nitroso compounds such as azodicarbonamide (ADCA) and N,N'-dinitrosopentamethylenetetramine (DPT), etc. base compounds. (Refer to, for example, Japanese Patent Application Laid-Open No. 2003-160685) [0004] EPDM foams using such blowing agents generally form closed cells. Since the closed-cell foam has high resilience, in order to use such an EPDM foam as a sealing material, closed cells are forcibly generated using a roller or a needle to reduce the r...

AI Technical Summary

Problems solved by technology

[0005] However, the EPDM foam that forcibly generates continuous cells in this way is actually a foam with semi-closed and semi-continuous cells. The proportion of independent cells is high, and the resilience cannot be sufficiently reduced. Such an EPDM foam is filled as a sealing material. When there is a gap, there is a problem that it is difficult to fill the gap

[0006] In addition, since such an EPDM foam is to form open cells after forming a foam with independent cells, when it is highly vulcanized during foaming, it may become difficult to generate open cells and the foam may cracked problem