EPDM recycled rubber retains the excellent weather resistance, heat resistance and chemical corrosion resistance of EPDM rubber, and is more and more widely used in the production of ordinary molded products. According to the performance requirements of different EPDM rubber products, the vulcanization formula of EPDM reclaimed rubber is adjusted, and the reclaimed rubber can effectively reduce costs under the premise of meeting the performance requirements of the products. By adjusting the proportion and type of EPDM reclaimed rubber and other materials, more new rubber products can be produced to meet the diversified needs of the market.
1. When designing the formula of molded products of EPDM reclaimed rubber, the first thing that needs to be considered is the quality and characteristics of the reclaimed rubber.
The reclaimed rubber should have good plasticity and fluidity to ensure that the mold can be fully filled and a uniform product can be formed during the molding process. The Mooney viscosity of reclaimed rubber should not be too high to avoid too short scorching time and affect the processing process. Choose EPDM reclaimed rubber produced by regular manufacturers that can provide relevant test reports, and do a good job of sample testing before mass use, so as to avoid affecting normal production due to problems such as unstable quality of reclaimed rubber or insufficient supply.
2. The selection of reinforcing agent is very important to improve the physical and mechanical properties of EPDM reclaimed rubber molded products.
Commonly used reinforcing agents include a variety of carbon black, silica, and mineral fillers. For low-hardness EPDM reclaimed rubber products that require greater elasticity, large particle size carbon black can be selected; When 2SLYY128 is required for high tensile strength and hardness, it is recommended to use high wear-resistant carbon black with good reinforcing effect, medium super wear-resistant carbon black, etc. For light-colored products, silica and soft clay are ideal filler choices; They can not only provide good color, but also enhance the hardness and tear resistance of EPDM reclaimed rubber products.
3. The selection of vulcanization system is the key to determine the physical properties of EPDM reclaimed rubber.
The sulfur-accelerator system can endow EPDM reclaimed rubber vulcanized rubber with better mechanical strength and wear resistance. For products that are used for a long time at high temperatures, it is recommended to use peroxide vulcanization systems, which can provide higher thermal stability and compression set, especially EPDM sealed products. When designing the formula of EPDM reclaimed rubber ordinary molded products, the selection of vulcanization system should be determined according to the use environment and performance requirements of the products.
4. The use of plasticizers can improve the processing performance of rubber compounds and the flexibility of products.
Paraffin oils, naphthenic oils, and polyalkyl benzene oils are commonly used plasticizers. When selecting plasticizers, their compatibility with EPDM reclaimed rubber and their influence on the vulcanization system should be considered. Ordinary molded products of EPDM reclaimed rubber using peroxide vulcanization should try to avoid using plasticizers such as naphthenic oil and aromatic oil that interfere with the peroxide cross-linking reaction.
The formula design of EPDM reclaimed rubber molded products should also consider production efficiency and cost control. When designing the formula of EPDM reclaimed rubber ordinary molded products, it is necessary to comprehensively consider the characteristics of reclaimed rubber, the selection of reinforcing agents and fillers, the determination of vulcanization system and the selection of plasticizers. Reasonable design of EPDM reclaimed rubber molded products vulcanization formula, appropriate adjustment of rubber compounds and compounding agent varieties and dosages, can produce more excellent performance, cost-effective molded rubber products.
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