EPDM rubber has low density and can be filled with rubber oil and fillers in large quantities. After filling, the physical and mechanical properties of the rubber do not change much. But in actual production, part of the filled rubber oil may contain volatile components, causing mold fouling. How to solve this? When using EPDM to produce rubber products, what other reasons can cause mold fouling problems? How should rubber product manufacturers solve it?
1. Rubber filler oil selection skills
When a large amount of rubber oil is filled in EPDM rubber products, the rubber product manufacturer chooses low-volatile rubber oil to reduce fouling; when it must be filled with volatile rubber oil, the amount of rubber oil 2LLYY1112 can be appropriately reduced, or use oil Glue replaces rubber oil containing volatile components. In actual production, petroleum rubber oil is volatile under high temperature conditions.
2. Other compounding agent selection skills
The vulcanization system of EPDM rubber products is composed of vulcanizing agent and accelerator. The addition of some accelerators such as TMTD (TMTD is easy to bloom) will cause mold fouling problems. It is necessary to choose a vulcanization system that is not easy to foul; you can try to use accelerators TBTD replaces the accelerator TMTD. Use mold release agents carefully to reduce mold fouling. Special additives can be used in appropriate amounts to effectively reduce fouling.
3. Improve the thermal tear resistance of EPDM
Experiments have shown that the better the thermal tear resistance of the rubber, the easier it is to demold, and it is not easy to build up in the mold. Improving the thermal tear resistance of EPDM rubber can reduce mold fouling. In actual production, the EPDM compound filled with a large number of large-particle mineral fillers will cause the thermal tear resistance of the compound to decrease. It is necessary to reduce the amount of filler, and take appropriate measures to improve the thermal tear resistance of the compound and reduce the mold accumulation. dirt.
4. Adjust vulcanization conditions
In the production of EPDM products, especially in the production of injection-type EPDM products, the rubber material is vulcanized at a lower temperature for a long time, and the vulcanized rubber is not easy to produce fouling in the mold. When EPDM reclaimed rubber and EPDM virgin rubber are used together to produce rubber products, rubber product manufacturers also need to comprehensively consider the basic properties of reclaimed rubber and virgin rubber and set the best vulcanization conditions.
At present, many EPDM rubber product manufacturers use EPDM reclaimed rubber to reduce the cost of raw materials. In actual production, the amount of rubber filler and rubber oil in the formulation of EPDM products containing EPDM reclaimed rubber is less than that of pure raw rubber products, which can reduce fouling to a certain extent. It should be noted that when EPDM products use EPDM reclaimed rubber to reduce costs, you must not choose to use volatile rubber oil softened reclaimed rubber to avoid mold fouling.
Compared with EPDM virgin rubber, EPDM reclaimed rubber has good fluidity, high plasticity, and low heat sensitivity. In the production of EPDM products, it can not only reduce the cost of raw materials, but also improve the processing performance of the rubber. Later editors have the opportunity to discuss with you various techniques for using EPDM reclaimed rubber to reduce costs.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits