Rubber Chem Encyclopedia

It is difficult to choose the right compounding agent.

Create Date:2019-03-05 08:50:42Click volume:678
It is difficult to choose the right compounding agent.

The so-called blooming is the phenomenon that the compounding agent penetrates into the surface after the mixing of the rubber compound. During the production process of the recycled rubber product, the incompatibility or chemical insolubility between the compounding agents, the amount of the compounding agent exceeding the solubility, etc. will result in the rubber compound after cooling. The problem of blooming is obvious; the blooming will not only affect the appearance of the recycled rubber products, but also reduce the self-adhesiveness of the rubber and affect the quality of the finished product; however, in the actual production process, the blooming is not unsolvable, if you choose the right compounding agent After the reclaimed rubber compound is cooled, it is difficult to achieve the frosting!

1. Vulcanization system

The commonly used compounding agents in the vulcanization system mainly include sulfur, peroxide, resin, metal oxides and various accelerators, etc., wherein the rubber vulcanized with insoluble sulfur, peroxide and peroxide crosslinking agent is not easy to bloom. Different types of recycled rubber products have different vulcanization systems; for example, the choice of sulfur, accelerator M, DPTT, TEDE, TMTD in the rubber formulation with EPDM reclaimed rubber as the main raw material is not easy to occur, and the production of EPDM reclaimed rubber products Manufacturers can also choose sulfur, MBTS, ZBDC, TMTD to reduce the probability of reclaimed rubber compound spray.

2. Filling system

Recycled rubber product filling system can not only improve the compounding performance and processing technology of the rubber compound, but also increase the product volume and reduce the production cost. It can not only improve the dimensional stability of the recycled rubber product, increase the mechanical strength of the rubber compound, reduce the deformation, and high fineness. The talcum powder can also reduce the probability of occurrence of reclaimed rubber compounding cream.

3. Softening and plasticizing

The softening plasticizing system in the production process of recycled rubber products can improve the processing performance of recycled rubber. If the amount of rubber oil is too much in the production process, it will cause the reclaimed rubber compound to spray the frost; therefore, when using recycled rubber to produce rubber products, try to It is most advantageous to use rubber oils with good compatibility with reclaimed rubber, such as butyl reclaimed rubber products and EPDM reclaimed rubber products, to select rubber oils with low specific gravity and low aromatic content; avoid excessive use of synthetic plasticizers and oil resistance. Excellent nitrile reclaimed rubber can use synthetic ester plasticizer containing low-carbon linear alcohol segment to effectively avoid blooming; in the production formula of recycled rubber products, the amount of rubber oil should be appropriately reduced to reduce the occurrence of blooming phenomenon.

The use of recycled rubber to produce rubber products, the rubber compound is mixed at a lower temperature for a long time to help the uniform dispersion of the compounding agent, and can also reduce the probability of the reclaimed rubber mixing rubber spray, so that the problem of improving the reclaimed rubber mixing rubber spray is Do you have any good comments and suggestions? Welcome to the discussion.