EPDM reclaimed rubber is recycled rubber products in high and low temperature, anti-aging, corrosion resistance, high insulation, the price is higher than the EPDM rubber, was used to produce all kinds of waterproofing membrane, wire and cable skin and other outdoor Rubber products, can maintain good performance in the sun and snow, significantly reducing the cost of raw materials. However, the use of EPDM reclaimed rubber production rubber products, if the curing temperature, curing time control is not good, curing speed will cause scorch, including a series of problems, not only will affect the EPDM rubber products The appearance, but also the use of the product performance and service life impact.
There are many factors that affect the curing speed of EPDM reclaimed rubber products. The vulcanization speed is mainly caused by the excessive amount of the used sulfur and accelerator in EPDM rubber. Many rubber products manufacturers are using EPDM rubber before the production of EPDM, and EPDM rubber regeneration a small amount of activators, activators and other ingredients are not completely separated out, which If the rubber products in accordance with the original formula of rubber products will result in too much dosage of compounding agent leads to the curing speed too fast. Therefore, EPDM reclaimed rubber formulations to formulate the original rubber products based on the formula to make the appropriate adjustments, while manufacturers can also be some measures to delay the curing of EPDM rubber products vulcanization rate.
1, delayed EPDM rubber products curing speed can be added within the scope of the cost of anti-scorching agent to prevent EPDM rubber products in the processing of early curing phenomenon, effective control of scorch time, commonly used Scorching agent oxalic acid, lactic acid, salicylic acid, phthalates, etc .;
2, although the curing agent can significantly improve the physical and mechanical properties of EPDM rubber reclaimed rubber, but too much will lead to excessive curing speed, so reduce the EPDM reclaimed rubber products vulcanizing system curing agent dosage can be Slow regeneration rubber curing speed;
3, accelerator EPDM reclaimed rubber formulations can shorten the curing time, reduce the curing temperature, reduce the amount of curing agent and improve the physical and mechanical properties of rubber, but if the accelerator type selection and the amount of improper will also speed up the rubber vulcanization Speed, so in the design of reclaimed EPDM rubber formulations, you can add a certain amount of accelerator NS, accelerator CZ and other post-cure vulcanization accelerator;
4, the use of acid fillers, while reducing the cost of EPDM reclaimed rubber products, but also can delay the vulcanization speed of reclaimed rubber products, such as the white carbon obtained by the gas phase method;
5, add the right amount of EPDM rubber products can slow down the curing of rubber oil.
There are many ways to delay the vulcanization rate of EPDM reclaimed rubber. The rubber product factory needs to choose the appropriate method according to their own needs without affecting other indicators, or use two or more methods to share.
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