Rubber additives are important auxiliary materials in the rubber industry. According to traditional classification, rubber additives are divided into four categories: vulcanization additives, protective additives, processing additives and other special functional rubber additives. Rubber additives play an important role in improving rubber processing technology, saving energy and improving product quality. In the rubber industry, although the amount of additives is relatively small, they play a decisive role in the improvement of product processing and application performance. Rubber additives with excellent performance can not only improve processing performance, improve product quality, reduce energy consumption and production costs, but also prevent aging degradation and extend service life. Rubber additives are not only the "MSG" of the rubber industry, but also provide broad prospects for the functionalization and diversification of their products.

Functional rubber additives refer to additives that can impart special physical and chemical properties to rubber compounds. Generally, they can be divided into processing additives, tackifiers, reinforcing agents, leveling agents, special vulcanizing agents, and anti-reversion agents. , Adhesion promoter, anti-scorching agent and other varieties. Processing aids refer to additives that can improve the processing performance but do not significantly affect the physical properties of the product. They can be divided into dispersants, lubricants, homogenizers, release agents, and mold release agents. Lubricants can effectively reduce rubber viscosity, reduce energy consumption, improve mixing efficiency, facilitate calendering and extrusion performance, and improve rubber performance. According to the compatibility with rubber, it can be divided into internal lubrication and external lubrication. Traditional products include stearic acid and zinc stearate. At present, the most widely used plasticizer in the industry is the plasticizer A developed by the Shanxi Provincial Institute of Chemical Industry. The dispersant is zinc palmitate soap, which has both internal and external lubrication functions. In addition, higher fatty alcohols, fatty acid esters, fatty amides, paraffin oil, polyethylene wax, or their mixtures, etc.

Dispersants refer to additives that can promote the dispersion of fillers in rubber compounds. These products have different varieties for different fillers, but the main components include lubricants, plasticizers and surfactants. China mainly has carbon black dispersant and white carbon black dispersant. The homogenizer refers to the auxiliary agent that can promote the compatibility of incompatible rubber species, and the blending of chlorinated butyl rubber and natural rubber in the airtight layer. At present, the product has already matured. Tackifier refers to the auxiliary agent that can improve the bonding performance of the rubber compound. Such products include asphalt, coumarone resins, terpene resins, rosin and its derivatives, petroleum resins and alkyl phenolic resins and their modified varieties. Among them, the viscosity and viscosity retention rate of alkyl phenolic resin can reach 2 to 3 times that of other tackifiers. This type of tackifier is currently the most widely used tackifier and is widely used in radial tires, tapes, rubber rollers and other fields . Reinforcing agent refers to additives that can increase the hardness and dynamic modulus of the rubber. Traditionally, increasing the hardness of the rubber is to increase the proportion of reinforcing fillers to increase the hardness, but it will bring a series of process problems and damage other properties. The use of reinforcing resin to increase the hardness can avoid these problems. Reinforcing agents include: high styrene resin, phenolic resin, tall oil modified resin, cashew nut oil modified resin and other varieties. High styrene resin can be co-vulcanized with rubber, but the price is relatively high, and the heat resistance is poor. At present, it is mainly used in non-coloring miscellaneous products. The tire industry and rubber roller industry mainly use phenolic reinforcing resins for reinforcement. This type of reinforcing agent forms an interpenetrating network structure with the rubber cross-linked network during vulcanization, and uses the rigidity of the phenolic network and the interpenetrating and superimposing of the two networks to achieve reinforcement the goal of. China currently produces phenolic resins, H-containing reinforcing resins, tall oil modified phenolic resins, and cashew nut oil modified phenolic resins. The oil-modified resin reduces the polarity of the phenolic resin, increases the density of the interpenetrating network, is easier to disperse in the rubber, and has a better reinforcing effect.

Special vulcanizing agent Sulfur is the most important vulcanizing agent in the rubber industry, but for some special rubbers and rubber compounds that require special characteristics, the use of sulfur vulcanization cannot meet the requirements. Some new vulcanizing agents have been developed. Special vulcanizing agents include resins. Vulcanizing agent. This type of vulcanizing agent is a phenolic resin with active groups of methylol and halogen. It can vulcanize various rubbers. At present, it is mainly used in butyl rubber, such as capsules, wind tires, water tires, tapes, and rubber plugs. , Butyl rubber damping material; application in EPDM rubber, used as a cross-linking agent of peroxide cross-linking agent, improve the heat aging resistance of vulcaniz The uniformity of the cross-linking bond greatly reduces the compression set and improves the retention rate of the physical properties of the rubber after aging.