Polypropylene is PP material, colorless, odorless, non-toxic, translucent thermoplastic synthetic resin, with high softening point, good heat resistance, high tensile strength, high hardness and high wear resistance, it is a kind of excellent performance General-purpose plastics; however, PP materials also have defects such as poor low-temperature impact strength, easy embrittlement, and poor weather resistance. Therefore, many rubber and plastic products processing companies choose to use vulcanized rubber powder to improve the toughness of polypropylene. Reasonable use of vulcanized rubber powder can significantly improve the toughness of PP without increasing production costs.
1. Dry the vulcanized rubber powder in advance
Vulcanized rubber powder will absorb moisture and moisture in the environment during transportation and storage; vulcanized rubber powder with higher moisture content is directly blended with polypropylene, and the performance of vulcanized rubber powder/PP blending materials will be seriously affected. Drying the vulcanized rubber powder in advance can effectively eliminate the moisture absorbed by the rubber powder 2LLYY828 in the environment, which is more beneficial to the surface treatment, and then improves the toughening effect of the vulcanized rubber powder on the PP material. The drying of vulcanized rubber powder is generally carried out at about 80℃, and it is appropriate to dry for about 4 hours.
2. The smaller the particle size, the better the toughening effect
When using vulcanized rubber powder to increase the toughness of polypropylene materials, theoretically the smaller the particle size of the rubber powder, the smaller the flow resistance in the blend, and the better the impact resistance of the blended material; The tensile strength of the blended material has decreased. When the amount of vulcanized rubber powder is controlled between 5%-15%, the toughening effect of the vulcanized rubber powder on the PP material is more obvious, and the comprehensive performance of the blended material is better. In actual production, PP toughening usually chooses about 80 mesh vulcanized rubber powder, which has good toughening effect and low cost.
3. Add coupling agent to improve blending effect
When vulcanized rubber powder is used to toughen PP, the presence of vulcanized rubber powder that does not have fluidity in the blending system in the form of particles will bring greater flow resistance, so the vulcanized rubber powder/PP blend material The fluidity increases as the particle size of the rubber powder becomes smaller, and decreases as the content of the rubber powder increases. In addition, the more the amount of vulcanized rubber powder, the lower the heat distortion temperature of the blend system. Appropriate use of silane coupling agent or titanate coupling agent can increase the thermal deformation temperature of the blend system and improve the interface performance of the vulcanized rubber powder/PP blend system.
In actual production, the amount of coupling agent in the vulcanized rubber powder/PP blend system should be controlled between 1‰ and 2‰.
From the perspective of cost, the preparation cost of PP modified material with vulcanized rubber powder is not much different from the price of pure PP material. Continuous research and development of the application range of vulcanized rubber powder in PP materials is of great significance to solve the environmental pollution problem of waste automobile tires and waste rubber products. Later editors will continue to share with you the specific use skills of vulcanized rubber powder modified polypropylene materials And application sites.
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