The raw materials of latex reclaimed rubber are waste natural rubber, waste latex products, etc., and have good compatibility with general rubber such as natural rubber, cis-butyl rubber, styrene-butadiene rubber and isoprene rubber, and replace the original rubber to produce rubber roller and reduce production cost; The hardness of the roller has a great influence on the performance of the rubber roller. However, the hardness requirements of the hose for different applications are different. It cannot be judged by the hardness. Therefore, when using latex reclaimed rubber to produce the rubber roller, measures need to be taken to adjust it. The hardness of the rubber roller.
1. Adjust the vulcanization system
Generally, the higher the crosslink density and the higher the hardness of the rubber compound, so adjusting the vulcanization system is one of the main ways to adjust the hardness of the rubber roller. Taking sulfur as an example, the amount of sulfur in the latex reclaimed rubber product is increased by 1-3 parts, and the hardness of the rubber roller is increased. It will increase by 5 degrees. Therefore, the amount of sulfur can be appropriately increased in the production of latex rubber rolls with high impact requirements. It can also be combined with highly active thiuram accelerators, oxime accelerators and sulfenamide accelerators. When adjusting the vulcanization system to adjust the hardness of the reclaimed rubber roller, rubber product manufacturers also need to pay attention to the vulcanization speed, vulcanizate heat resistance and scorch safety.
2. Adjust the reinforcing filling system
Reinforcing filling system is an important factor affecting the hardness of rubber roller. The reinforcing effect and hardening effect of different kinds of reinforcing agents in latex reclaimed rubber are different. In theory, the hardness of latex rubber roller will follow the reinforcing agent and filler. The dosage is increased continuously, and the softening of the furnace black, the high wear-resistant carbon black, the mixable black, and the super wear-resistant furnace black can significantly improve the hardness of the latex rubber roller and the hardening effect of the non-reinforcing filler calcium carbonate. Relatively small; however, due to the excessive use of reinforcing agents and fillers, the rubber will be self-adhesive and easy to delaminate. Therefore, rubber product manufacturers need to control the amount of reinforcing agent and filler when adjusting the reinforcing filling system. .
3. Adjust the softening system
Choosing a suitable reinforcing agent can significantly increase the hardness of the latex rubber roller, and the main function of the softener in the production of rubber products is to increase the plasticity of the rubber compound and increase the viscosity, thereby improving the processing technology of the rubber compound and reducing the rubber compound within a certain range. Hardness, the opposite of the reinforced filling system; generally for latex rubber rollers with lower hardness requirements, rubber product manufacturers can adjust the hardness by increasing or decreasing the softener.
4. When the hardness of the rubber roller is increased, the resin can be used together.
Resin is a polymer compound for the production of plastic products. It can be divided into natural resin and synthetic resin. High styrene resin is a special synthetic resin. It is an emulsion copolymer of styrene and butadiene. It has low relative density and high hardness. It has good impact resistance and can be used as an ideal material to increase the hardness of latex reclaimed rubber rollers. Different types of resins have different hardening effects in reclaimed rubber. Generally, nitrile rubber rolls are hardened with PVC resin.