EPDM has a low density and can be filled with a large amount of rubber oil and filler. After filling, the physical and mechanical properties of the rubber have little change. However, in actual production, some of the filled rubber oil may contain volatile components, resulting in scaling of the mold. How to solve this problem? When EPDM is used to produce rubber products, what other reasons can lead to mold scaling? How should rubber product manufacturers solve this problem?
1. Rubber filling oil selection skills
When a large amount of rubber oil is filled in EPDM rubber products, the rubber product manufacturer can select low volatile rubber oil to reduce the scale; When volatile rubber oil must be used for filling, the amount of rubber oil 2LLYY1112WFM can be appropriately reduced, or oil glue can be used to replace the rubber oil containing volatile matter. In actual production, petroleum rubber oil is volatile at high temperature.
2. Other compounding agent selection skills
The vulcanization system of EPDM rubber products is composed of vulcanizing agent and accelerant. The addition of some accelerants, such as TMTD (TMTD is easy to spray frost), will cause the problem of mold scaling, so it is necessary to select a vulcanization system that is not easy to scale; You can try to use accelerator TBTD instead of accelerator TMTD. Use release agent carefully to reduce mold fouling. Special additives can be used appropriately to effectively reduce the formation of scale.
3. Improve the thermal tearing resistance of EPDM
The experiment shows that the better the thermal tearing resistance of the rubber, the easier it is to demould and not easy to deposit in the mold. Improving the thermal tearing resistance of EPDM can reduce the mold fouling. In actual production, EPDM rubber filled with a large number of large-particle mineral fillers will lead to a decline in the thermal tear resistance of the rubber. It is necessary to reduce the amount of fillers, take appropriate measures to improve the thermal tear resistance of the rubber and reduce mold fouling.
4. Adjust curing conditions
When EPDM products are produced, especially injection EPDM products, the rubber compound is vulcanized for a long time at a lower temperature, and the vulcanizate is not easy to produce scale in the mold. When EPDM recycled rubber and EPDM raw rubber are used together to produce rubber products, the rubber product manufacturer also needs to comprehensively consider the basic properties of recycled rubber and raw rubber and set the best curing conditions.
At present, many manufacturers of EPDM rubber products use EPDM recycled rubber to reduce the cost of raw materials. In actual production, the amount of rubber filler and rubber oil in the EPDM product formula containing EPDM reclaimed rubber is less than that in the pure rubber product formula, which can reduce the scale to a certain extent. It should be noted that when EPDM products use EPDM recycled rubber to reduce costs, it is not allowed to use volatile rubber oil softened recycled rubber to avoid mold scaling.
Compared with EPDM raw rubber, EPDM reclaimed rubber has good fluidity, high plasticity and low thermal sensitivity. It can not only reduce the raw material cost, but also improve the rubber processing technology when used in the production of EPDM products. Later, the editor has the opportunity to discuss with you the cost reduction techniques of using EPDM recycled rubber products.
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