High-hardness ethylene-propylene-diene monomer (EPDM) rubber for extrusion

A technology of EPDM rubber with high hardness, which is applied in the field of rubber, which can solve the problems affecting the appearance of the product, such as door and window sealing, surface micro-wrinkling, etc., and achieve the effects of good reinforcement performance, long service life and good fluidity

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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the door and window sealing strips used in automobiles are 70 hardness grades (the hardness range is 70±5 degrees). After a long period of use, the product often has surface micro-wrinkles, which affects the appearance of the product and the overall sealing performance of doors and windows. After analysis This phenomenon is caused by the softness of the rubber material. Therefore, it is imperative to develop a high hardness EPDM rubber. The high hardness here usually refers to a hardness greater than 80 Shore A.

Method used

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  • High-hardness ethylene-propylene-diene monomer (EPDM) rubber for extrusion
  • High-hardness ethylene-propylene-diene monomer (EPDM) rubber for extrusion
  • High-hardness ethylene-propylene-diene monomer (EPDM) rubber for extrusion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0013] In parts by mass

[0014]

[0015]

[0016] Note: Examples 1 and 2 are EPDM raw rubber with a Mooney viscosity of 40 at ML (1+4) at 125°C; Example 3 is EPDM with a Mooney viscosity of 30 at ML (1+4) at 125°C Acrylic raw rubber; Embodiment 4 and 5 are the EPDM raw rubber that ML (1+4) 125 ℃ Mooney viscosity is 20;

[0017] According to the raw materials in the embodiment formula, the film is made into a film for testing and detection. The properties of the high hardness EPDM rubber used for extrusion are as follows:

[0018]

[0019] From the data in the above table, it can be concluded that the high-hardness EPDM rubber used for extrusion not only has a good extrusion process, but also the physical properties of the product are much higher than the standards of the old products. The practical application in it can meet the current use requirements.

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Abstract

The invention relates to a high-hardness ethylene-propylene-diene monomer (EPDM) rubber for extrusion, which comprises the following components of EPDM crude rubbers, zinc oxide, polyethylene glycol, stearic acid, an antiager 1,2-dihydro-2,2,4-trimethylquinoline (RD), fast-extruding carbon black, semi-reinforcing carbon black, paraffinoil, accelerating agent BZ, accelerating agent tetramethylthiuram disulfide (TMTD), accelerating agent dipentamethylenethiuram tetrasulfide (DPTT), accelerating agent 4,4`-dithiodimorpholine (DTDM) and vulcanizing agent. The high-hardness ethylene-propylene-diene monomer rubber for extrusion has the advantages that the extrusion technology is good; the physical properties of the product are greatly higher than the standard of the traditional product; the hardness is above 80 Shore A; and the EPDM rubber can meet the current use requirements through the practical application in the seal of doors and windows.

Description

technical field [0001] The invention relates to the technical field of rubber, in particular to a high-hardness EPDM rubber for extrusion. Background technique [0002] EPDM rubber has high chemical stability, excellent weather resistance, excellent ozone resistance, heat resistance and water vapor resistance, and also has good electrical insulation and wear resistance. Its physical and mechanical properties and comprehensive properties relatively balanced. In non-tire automotive rubber, EPDM rubber is the most consumed type of rubber, mainly used in the manufacture of door and window sealing strips, radiator hoses and other parts, of which the largest amount of door and window sealing strips. [0003] At present, most of the door and window sealing strips used in automobiles are 70 hardness grades (the hardness range is 70±5 degrees). After a long period of use, the product often has surface micro-wrinkles, which affects the appearance of the product and the overall sealin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08K13/02C08K3/22C08K5/09C08K3/04C08K5/3437C08K5/39C08K5/40C08K5/378C08K3/06
Inventor 张洪起张桂林
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