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EPDM (Ethylene-Propylene-Diene Monomer) for sealing ring and vulcanization method thereof

A technology of EPDM rubber and sealing ring, applied in the rubber field, can solve the problems such as troublesome trimming of sealing ring products, poor production process, product appearance defects, etc., to ensure compression deformation performance, low compression set Difficulty tearing the edges

Inactive Publication Date: 2016-07-20
QINGDAO TKS SEALING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides an EPDM rubber for sealing rings and its vulcanization method, which solves the problems of high compression deformation rate, poor durability, poor tear resistance, poor production processability and vulcanized sealing rings existing in the prior art. The trimming of the product is troublesome, and it is very easy to tear the product, resulting in defects in the appearance of the product and high scrap rate

Method used

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  • EPDM (Ethylene-Propylene-Diene Monomer) for sealing ring and vulcanization method thereof
  • EPDM (Ethylene-Propylene-Diene Monomer) for sealing ring and vulcanization method thereof

Examples

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Effect test

Embodiment 1

[0017] An EPDM rubber for sealing rings, comprising the following components: non-oil-extended ethylene-propylene rubber, oil-extended ethylene-propylene rubber, ZnO, anti-aging agent, general-purpose carbon black, sulfur, odorless DCP, and crosslinking agent TAIC. Sulfur and peroxides are used in conjunction with a vulcanization system. The peroxide vulcanizing agent adopts dicumyl peroxide. The sealing ring is made of EPDM rubber by mixing method. The compression deformation rate of the rubber is less than 15%. The parts by weight of each component are: 50 parts of non-oil-extended ethylene-propylene rubber raw rubber; 50 parts of oil-extended ethylene-propylene rubber raw rubber (according to the oil-extending amount); 5 parts of ZnO; 1 part of anti-aging agent; 60 parts of general-purpose carbon black ( According to hardness); 0.5 parts of sulfur, 2.5 parts of odorless DCP; 0.5 parts of crosslinking agent TAIC.

Embodiment 2

[0019] A kind of EPDM rubber for sealing ring, similar to Example 1, the difference is that the parts by weight of each component are: 60 parts of non-oil-extended ethylene-propylene rubber raw rubber; 80 parts of oil-extended ethylene-propylene rubber raw rubber 5 parts of ZnO; 2 parts of anti-aging agent; 80 parts of universal carbon black (according to hardness); 1.5 parts of sulfur, 3.5 parts of odorless DCP; 1 part of crosslinking agent TAIC.

[0020] Example 2:

[0021] A kind of EPDM rubber for sealing ring, similar to Example 1, the difference is that the parts by weight of each component are: 55 parts of non-oil-extended ethylene-propylene rubber raw rubber; 65 parts of oil-extended ethylene-propylene rubber raw rubber 5 parts of ZnO; 1.5 parts of anti-aging agent; 70 parts of universal carbon black (according to hardness); 1 part of sulfur, 3 parts of odorless DCP; 0.8 parts of crosslinking agent TAIC.

Embodiment 4

[0023] A vulcanization method of EPDM rubber for sealing rings, comprising the following steps: the first step, cleaning the mold, placing the rubber blank, and closing the mold; the second step, entering the vulcanization equipment after the mold is closed, and the vulcanization equipment enters the mold, The time before pressing up is set between 5s; the third step is to press up when the mold is about to bear pressure after rising, and rise to the pressure peak within 2s; the fourth step is to unload the mold.

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Abstract

The invention relates to EPDM (Ethylene-Propylene-Diene Monomer) for a sealing ring and a vulcanization method thereof. The EPDM for the sealing ring comprises the following components: non-oil-filled raw ethylene-propylene rubber, oil-filled raw ethylene-propylene rubber, ZnO, an anti-aging agent, general purpose black, sulfur, flavorless DCP and a cross-linking agent TAIC. In the cross-linking process, both C-C bonds and S cross-linking bonds are contained, the compression deformation rate is low, and the tear resistance is improved; the oil-filled raw ethylene-propylene rubber and the non-oil-filled raw ethylene-propylene rubber can be combined, so that the compression deformation performance is guaranteed, usage of plasticizer oil in the formula is reduced, and the rubber is easily and uniformly mixed and is high in liquidity, thin in rubber edge and easy to tear; and moreover, the product has the advantage that peroxide vulcanizedethylene-propylene rubber is low in permanent compression deformation rate, and the problem that peroxide vulcanizedEPDM products are difficult to tear is solved, so that the performance and production efficiency of the product are improved.

Description

technical field [0001] The invention belongs to the technical field of rubber, and relates to EPDM rubber for sealing rings and a vulcanization method thereof. Background technique [0002] At present, in the production process of rubber products, the compression permanent deformation performance of the rubber directly affects the sealing performance and service life of the sealing ring, and the same is true for the EPDM sealing ring. EPDM rubber using sulfur or semi-effective vulcanization system has a large compression deformation rate and poor durability; EPDM rubber using peroxide or other vulcanization systems has good durability, but the compression deformation rate can reach 15 % or even less, but the c-c cross-linking bond energy is high and the cross-linking degree is high. The product has poor tear resistance and poor production process. It is troublesome to trim the vulcanized sealing ring product, and it is very easy to tear the product, resulting in product appe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08K13/02C08K3/22C08K3/06C08K5/14C08K3/04
CPCC08K13/02C08K3/04C08K3/06C08K3/22C08K5/14C08K2003/2296
Inventor 张喜俊
Owner QINGDAO TKS SEALING IND
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