Rubber Chem Encyclopedia

What should I do if the filler is not evenly dispersed in the reclaimed rubber?

Create Date:2019-06-11 10:49:58Click volume:173
What should I do if the filler is not evenly dispersed in the reclaimed rubber?

Recycled rubber and raw rubber are the most commonly used production methods in the rubber products industry. The compatibility of reclaimed rubber and raw rubber, the dispersibility of compounding agent in the compound and the co-vulcanization of the rubber will affect the reclaimed rubber and the original. Glue and glue quality, in which the filler can not be uniformly dispersed in the reclaimed rubber and different kinds of raw rubber, which will cause a series of problems; then why is the filler not uniformly dispersed in the reclaimed rubber and the original rubber? How to solve this problem.

1. The reason why the filler can not be uniformly dispersed in the reclaimed rubber and the original rubber

Each rubber filler has its own unique molecular structure. The solubility of the same filler in different rubber compounds is different, that is, the dispersibility is different, which causes the rubber filler to migrate in the reclaimed rubber and the original rubber. Generally, the rubber filler tends to migrate. It migrates from a low polarity phase to a high polarity rubber phase, and easily migrates from a saturated low polarity rubber to a highly polar rubber phase containing a large amount of unsaturated bonds; the filler has a different solubility in the reclaimed rubber and the original rubber. The rubber phase of the rubber can not be evenly distributed, resulting in a decrease in the physical and mechanical properties of the rubber and the original rubber.

2. The solution that the filler can not be uniformly dispersed in the reclaimed rubber and the rubber

For the problem that the filler can not be uniformly dispersed in the reclaimed rubber and the original rubber, the rubber product manufacturer can solve the following three methods: 1 adding most of the filler to the rubber with low unsaturation or low polarity to make the mother The rubber is added to the rubber used in combination, and finally the remaining small part of the filler (such as reinforcing carbon black) is mixed according to the general method; 2 the reclaimed rubber and the original rubber are separately made into a rubber compound and then according to actual needs. Blending; 3 adding a functional processing aid such as a compatibilizer or a homogenizer.

In actual production, reclaimed rubber is usually used in combination with similar raw rubber, such as EPDM reclaimed rubber and EPDM rubber, butyl reclaimed rubber with butyl rubber, etc., when the two rubbers have similar polarity but Since the composition of the reclaimed rubber is more complicated, the dispersibility of the filler in the two is different. Usually, the original rubber is fully plasticized and then co-kneaded with the reclaimed rubber. For the problem of using different rubbers such as EPDM reclaimed rubber and butyl reclaimed rubber or butyl rubber mixed with EPDM reclaimed rubber, it is necessary to consider the polarity of the two.

Recycled rubber and raw rubber can be used together to produce rubber products, which can not only ensure the quality of products, but also reduce the production cost. It is the mainstream production method in rubber products industry. When reclaimed rubber is used together with original rubber or reclaimed rubber and reclaimed rubber, it is also necessary to consider the phase between rubbers. Capacitance, dispersibility of the vulcanizing agent in the rubber compound, and whether co-vulcanization can be achieved between the rubber compounds, etc., follow-up Xiaobian and you will discuss them one by one.