The so-called rubber injection process is a molding method in which the rubber material is injected directly from the barrel into the model vulcanization. It mainly includes feeding, plasticizing, injection, pressure holding, vulcanization, mold release and other processes. It requires the temperature of the inner and outer layers to be the same. Can be vulcanized quickly. Latex reclaimed rubber products are injection molded, and the Mooney viscosity of the rubber material directly affects the efficiency and quality of injection molding. Rubber product manufacturers need to take certain measures to adjust the Mooney viscosity of the rubber material to improve the production efficiency and yield of the recycled latex products for injection molding.
1. The relationship between Mooney viscosity and injection process
When injection molding is selected for natural reclaimed rubber products, Mooney viscosity affects the injection molding process. In general, the lower the viscosity of the reclaimed rubber, the better the fluidity of the compound. It is easy to fill the mold cavity during the injection process. The injection time required is short and the appearance of the finished product is good. It should be noted that the general low Mooney compound is The heat generated during plasticization and injection is small, so the curing time is longer.
The latex reclaimed rubber with a relatively high viscosity of Mooney requires a long injection time during the injection molding process. The heat generated during the injection molding process is large, which is beneficial for high temperature and rapid vulcanization. It should be noted here that during the injection molding process of high Mooney reclaimed rubber Easy to cause scorch.
When latex recycled rubber is used to produce injection molded rubber products, the low and high viscosity of recycled rubber Mooney will affect the injection molding process, so rubber product manufacturers need to take certain measures to adjust the viscosity of recycled rubber Mooney. Generally injection molded latex recycled rubber The Mooney viscosity of the rubber used in the products should be controlled below 65 degrees.
2. Adjust Mooney viscosity to improve rubber injection process
To adjust the Mooney viscosity of reclaimed rubber, rubber product manufacturers can choose from the following three methods: using shear force, using a plasticizer, and using two types of rubber with different viscosities. When the shear force is used to break the large molecular chain of latex reclaimed rubber 2LLYY528 into small molecular chains to reduce Mooney viscosity, the molecular chain damage is small and the compound performance is better, but the Mooney viscosity decreases by a small range and the cost is high. When chemical peptizer is used to reduce the Mooney viscosity of the rubber compound, the Mooney viscosity decreases rapidly and the cost is low, but the performance of the recycled rubber is greatly affected.
There are advantages and disadvantages of using the above two methods to reduce the viscosity of latex recycled rubber Mooney. Rubber product manufacturers can choose according to actual needs. In actual production, it is also possible to use two latex reclaimed rubbers with different Mooney viscosities together, or to use latex reclaimed rubber with low Mooney viscosity isoprene reclaimed rubber, to improve the performance of the compound injection process and improve the regeneration The viscosity, heat resistance and aging resistance of rubber products.
The injection molding process has strict requirements on Mooney viscosity and fineness of reclaimed rubber. With the continuous development of recycled rubber production technology, the quality of recycled rubber continues to improve, more and more recycled rubber products choose injection molding technology, later editors will share with you other issues about recycled rubber injection molding.