Rubber products are based on raw rubber and added with appropriate amount of compounding agents. …
1. Natural or synthetic rubber without compounding agents or without vulcanization is collectively referred to as raw rubber. Natural rubber has good comprehensive properties, but its output can not meet the needs of industry, nor can it meet some special performance requirements, so there are many applications of synthetic rubber. …
Compounding agent In order to improve and improve the various properties of rubber products, the substance added is called compounding agent. Compounding agents mainly include vulcanization thorns, fillers, vulcanization accelerators, plasticizers, anti-aging agents and foaming agents.
① The role of vulcanizing agent is similar to the curing agent in thermosetting plastics. It makes the rubber molecular chains form horizontal chains, appropriately cross-linked, and become a network structure, thereby improving the mechanical and physical properties of the rubber. Commonly used sulfide is sulfur and sulfide. …
② The filler is to improve the mechanical properties of rubber, such as strength, hardness, wear resistance and rigidity. The most commonly used fillers are carbon black and textiles, fibers, and even metal wires or metal braids as framework materials. Adding fillers can also reduce the amount of raw rubber and reduce the cost of rubber. …
③ Other compounding agents vulcanization accelerators can accelerate the vulcanization process and improve the vulcanization effect; plasticizers are used to increase rubber plasticity and improve molding process performance; antioxidants (antioxidants) are used to prevent or delay rubber aging.
2. Features and applications of rubber products
Rubber products have the characteristics of high elasticity, high resilience, high strength and high wear resistance. Its elastic modulus is very low, only 1-10 MPa, and its elastic deformation is very large, up to 100% to 1000%. It has excellent flexibility and energy storage capacity. In addition, it has good wear resistance, sound insulation, damping and insulation. However, rubber has poor heat resistance and cold resistance (sticky at high temperatures, brittle when exposed to cold), and will dissolve in solvents. …
In industry, rubber can be used to make tires, static and dynamic seals, vibration damping and anti-vibration parts, transmission belts, conveyor belts and pipelines, wires, cables, electrical insulation materials and brake parts.
Post time: Nov-17-2021