EPDM Rubber Encyclopedia

How to coordinate the relationship between heat resistance and cost of EPDM compound

Create Date:2019-08-08 08:33:14Click volume:288
How to coordinate the relationship between heat resistance and cost of EPDM compound

EPDM rubber has excellent high temperature resistance, and the rubber products produced can generally be used for a long time at a high temperature of 130 ° C. The EPDM reclaimed rubber itself has low density and can be filled with rubber oil and filler in a large amount to reduce the cost; In the case of hot EPDM rubber products, a large amount of filling will cause a significant decrease in the heat aging resistance of the rubber compound, so how to coordinate the relationship between the heat resistance of the EPDM rubber compound and the cost of the product? 1JLYY88?

1. Reasonable control of the amount of glue

Under normal circumstances, the high rubber content of EPDM rubber products has the best heat aging resistance. Studies have shown that when the rubber content of EPDM rubber is increased from 25% to 48%, the rubber compound is broken at the same temperature. The time required for the elongation to fall to 100% is significantly prolonged, and the rubber has excellent heat resistance. However, in actual production, high rubber content means high cost, which is the result that every rubber product manufacturer does not want to see. Therefore, rubber product manufacturers should reasonably control the rubber content of EPDM rubber products according to actual needs. Coordinating the relationship between cost and heat resistance, for example, the rubber content of automotive radiator hoses in the market is generally controlled between 35% and 40%.

2. Reasonable use of compounding agent

Theoretically, the heat resistance of EPDM rubber after peroxide vulcanization is better than that of sulfur vulcanizate. Medium or medium or low reinforcing carbon black, white carbon black and inorganic fillers such as talc and calcined kaolin The heat resistance of the EPDM rubber product is more favorable; the compounding agent such as zinc oxide, magnesium oxide and cerium oxide in the metal oxide itself has good thermal stability and can improve the heat resistance of the EPDM rubber compound. When the rubber compounding agent is used to improve the heat resistance of the rubber compound, the influence of the auxiliary agent on other properties of the rubber compound is also required, and the amount of the compounding agent is appropriately controlled. For example, the white carbon black can improve the heat resistance of the rubber compound and cause permanent deformation of the vulcanized rubber. The increase and the rebound resilience are poor, and the amount of the metal oxide is generally controlled to be about 5-20 parts.

3. Reasonable use of reclaimed rubber

In the EPDM rubber products, a large amount of rubber filler and rubber oil will reduce the heat resistance of the rubber compound and need reasonable control. How should the manufacturer of EPDM rubber products control the production cost of rubber products? The EPDM reclaimed rubber processed by EPDM unvulcanized rubber compound or waste EPDM sealing strip and sealing ring retains the original basic performance characteristics of EPDM rubber and has excellent high temperature resistance. EPDM rubber has good compatibility and the price is much lower than that of EPDM. It can replace some of the original rubber to produce heat-resistant rubber products, ensuring the heat resistance of the rubber and reducing the production cost.

When using EPDM rubber to produce heat-resistant rubber products, rubber manufacturers need to properly control the amount of glue, carefully select the compounding agent, properly mix the recycled rubber, and coordinate the heat resistance and production of EPDM rubber products through various means. The relationship between costs. In this small series, we recommend that you use EPDM reclaimed rubber, select the appropriate index of EPDM reclaimed rubber according to the specific needs of heat-resistant EPDM products, reasonably control the amount of reclaimed rubber, and appropriately adjust the three-dimensional B containing reclaimed rubber. Formulation of propylene heat-resistant rubber products, suddenly felt back again? Hey!