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Excellent cavity filling rubber composition

A rubber composition and rubber technology, applied in the field of rubber compositions, can solve the problems of deterioration of mold release performance, mold pollution, reduction of mold release performance, etc. Effect

Active Publication Date: 2020-05-19
HUINNOVATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the method has problems such as product defects and mold contamination due to a reduction in mold release performance (wherein the rubber produced from the composition is not easily released from the mold 110), and due to an underfill phenomenon (wherein Deterioration of mold release performance in a mold caused by the rubber composition not sufficiently filling the sawtooth portion 110a) inside the mold when the mold release agent is applied

Method used

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  • Excellent cavity filling rubber composition
  • Excellent cavity filling rubber composition
  • Excellent cavity filling rubber composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] 300 g of ethylene propylene diene rubber (EPDM) and 200 g of very low density polyethylene (VLDPE) were mixed with 700 g of butadiene rubber (BR). Knead hardener (30g n-butyl 4,4-di-tert-butylperoxyvalerate), inorganic filler (300g silica, 50g titanium oxide) and wax (80g polyethylene, 20g slip agent). Here, the very low density polyethylene (VLDPE) has a density of 0.87 and a melting temperature of 60°C.

Embodiment 2

[0082] Except that 200 g of ionomer of ethylene-methacrylic acid copolymer (EMAA) produced by reacting ethylene monomer and acrylic acid monomer in a weight ratio of 9:1 was used instead of the very low density polyethylene (VLDPE) , A mixture was prepared in the same manner as in Example 1. Here, the ionomer of the ethylene-methacrylic acid copolymer (EMAA) has a density of 0.95 and a melting temperature of 70°C.

Embodiment 3

[0084] In addition to replacing the very low density polyethylene (VLDPE) with 200 g of ethylene-methyl acrylate copolymer (EMA) produced by reacting ethylene monomer and methyl acrylate monomer at a weight ratio of 9:1, A mixture was prepared in the same manner as in Example 1. Here, the ethylene-methyl acrylate copolymer (EMA) had a density of 0.94, and a melting temperature thereof of 72°C.

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Abstract

The present invention relates to a rubber composition comprising butadiene rubber, ethylene-propylene diene monomer rubber, non-crosslinked rubber containing a particular polymer additive capable of improving the in-mold mobility of the rubber composition, a washing agent or wax, a hardening agent, and an inorganic filler.

Description

technical field [0001] The present invention relates to a rubber composition for removing contaminants remaining in a mold during a continuous molding process of a thermoplastic resin and then providing mold release properties to the mold. More particularly, the present invention relates to a rubber composition having excellent filling properties by virtue of a combination of specific components to improve the fluidity of the rubber composition in a mold. Background technique [0002] Contaminants introduced during processing and carbides of some molded products remain in the mold used to mold the product through compression and heating of the thermoplastic resin as a raw material. These contaminants and carbides act as contaminants in subsequent repeated processes, thus bringing defects to some of the molded products produced and deteriorating product quality throughout the continuous molding process. Therefore, work to remove contaminants remaining in the mold (so-called ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L9/00C08L23/16C08L23/06C08L23/08C08K13/02C08K5/14C08K3/36C08K3/22
CPCC08L9/00C08L2205/025C08L2205/035C08L2207/064C08L23/16C08L23/06C08K13/02C08K5/14C08K3/36C08K2003/2241C08L23/0869C08L23/0853C08L23/0815C08K3/00C08K5/00C08L23/00C08L33/06C08L91/06
Inventor 李东权李文硕
Owner HUINNOVATION