EPDM rubber has low density and can be filled with a large amount of rubber oil and filler, and the physical and mechanical properties of the rubber compound do not change much after filling. However, in actual production, the partially filled rubber oil may contain volatile components, resulting in the problem of mold accumulation. How to solve this? When using EPDM rubber to produce rubber products, what are the reasons for mold accumulation? Scale problem occurs? 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, rubber product manufacturers choose low-volatile rubber oil to reduce fouling; when volatile rubber oil must be used for filling, the amount of rubber oil 2LLYY1112WFM can be appropriately reduced, or the use of oil Glue replaces rubber oil containing volatile components. In actual production, petroleum-based rubber oil is volatile under high temperature conditions.
2. Other compounding agent selection skills
The vulcanization system of EPDM rubber products is composed of a vulcanizing agent and an accelerator. The addition of some accelerators such as TMTD (TMTD is easy to bloom) will cause the problem of mold fouling. It is necessary to choose a vulcanization system that is not easy to foul; you can try to use an accelerator TBTD replaces accelerator TMTD. Use mold release agents sparingly to reduce mold build-up. Appropriate amount of special additives can be used to effectively reduce fouling.
3. Improve the thermal tear resistance of EPDM rubber
Experiments show that the better the thermal tear resistance of the rubber compound, the easier it is to demold, and it is not easy to accumulate scale 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 amount of large particle size mineral fillers will lead to the decline of the thermal tear resistance of the compound. It is necessary to reduce the amount of fillers and take appropriate measures to improve the thermal tear resistance of the compound and reduce the mold area. dirt.
4. Adjust the vulcanization conditions
In the production of EPDM products, especially injection-type EPDM products, the vulcanizate is vulcanized for a long time at a lower temperature, and the vulcanizate is not easy to produce fouling in the mold. When EPDM reclaimed rubber and EPDM raw rubber are used together to produce rubber products, rubber product manufacturers also need to comprehensively consider the basic properties of reclaimed rubber and original 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 formula 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, do not choose to use reclaimed rubber softened by volatile rubber oil to avoid mold fouling.
Compared with EPDM raw rubber, EPDM reclaimed rubber has good fluidity, high plasticity and low thermal sensitivity. It can not only reduce the cost of raw materials, but also improve the processing technology of rubber when used in the production of EPDM products. Later, the editor will have the opportunity to discuss with you the skills of using EPDM reclaimed rubber to reduce the cost of EPDM rubber products.
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2022-04-28
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