China's rubber additives technology research and development

After nearly 50 years of development, China's rubber chemicals industry has more than 80 production units, an annual production capacity of more than 150,000 tons, and more than 200 additives. Anti-aging system, vulcanization system, and processing operation system additives are all produced. The main varieties are exported in addition to meeting domestic demand. In 1998, 5,134 tons of export accelerators and 2,666 tons of anti-aging agents were exported.

New varieties in recent years

1 Anti-reversion anti-reversion agent Anti-reversion anti-reversion agent is the latest type of auxiliary agent at home and abroad, which is specially used to improve the anti-reversion property of vulcanized rubber. Shanxi Province Institute of Chemical Industry developed and put into operation a series of varieties. The Institute's multifunctional anti-reversion agent DL-268 can give a good sulfur vulcanization system, good resistance to restitution, heat resistance, improve fiber cord and rubber bonding strength and have a high retention rate, apply to Cord rubber products. The heat-curing active agent SL-273 is a zinc soap with an optimized structure. It is the lowest-priced anti-reversion agent and is suitable for the vulcanization of diene-based rubbers, especially natural rubber, to improve high temperature and long-time rubber vulcanization. The resistance to vulcanization, increase heat resistance and degree of cross-linking, reduce dynamic heat, increase hardness. It is not only suitable for large thick products. High-temperature rapid vulcanization process and heat-resistant products, etc., and can replace part of the silane coupling agent in the silica rubber compound to improve rheological properties. The multifunctional plasticizer A-256 of this institute not only has the function of anti-reversion resistance and heat resistance, but also has the function of plasticizer A to reduce the viscosity of the rubber and improve the fluidity of the rubber.

The post-vulcanization stabilizer HS-258 introduced in 2000 is equivalent to the company's HTS, used in ordinary sulfur vulcanization systems and semi-effective vulcanization systems to improve the resistance to vulcanization, heat resistance and dynamic performance. As an adhesion promoter for steel cords and rubber, and as a dynamic performance modifier for SBR. In summary, the anti-reversion anti-reversion agent can be regarded as a new auxiliary agent for the vulcanization system, and can also be regarded as a new auxiliary agent for the anti-aging system, which has a protection of the vulcanization network to make it stable, and improve the stability of the product to heat-resistant oxygen. , while maintaining the advantages of good dynamic performance of ordinary curing systems and semi-effective curing systems.

2 The anti-ageing agents of anti-aging agents are more complete and the internal quality is further improved. Nanjing Chemical Plant p-phenylenediamine antioxidant 4020 and 4010NA all granulation, the total production capacity has reached 125 million tons. The plant increased the content of dimer and trimer in the antioxidant RD, thereby improving the comprehensive protection effect. The HS-9ilA series H-9 amine-H series produced by Zhejiang Huangyan Huaxing Chemical Factory is obtained by adsorbing the product of the aniline and the unsaturated aromatic hydrocarbon via the filler, and has slight pollution, and is suitable for color cables and sheathing rubber materials. The phosphite antioxidant TNP is produced by the Jilin Chemical Longshan Chemical Plant and is non-discoloring and non-polluting. It has outstanding oxidation resistance especially in SBR.

3 Vulcanizing agent Shanghai Jinghai Chemical Co., Ltd. successfully developed the non-aqueous phase continuous high-temperature polymerization system to produce IISH series of insoluble sulfur technology, and the company has formed a series of products. The new product has good thermal stability and is easy to disperse. Shanxi Provincial Institute of Chemical Industry optimizes the process to produce excellent quality octylphenol phenol resin (201) type 1 and type 2 products, and octylphenol series vulcanized resin (202), suitable for the vulcanization of butyl rubber. Make medical stoppers. Seals and heat-resistant products, when using 201 no need to add activator, product heat resistance, ozone resistance and good flexing performance. The new process produces co-crosslinking agent HV268, which is equivalent to imported HVAZ, suitable for EPDM, NBRIR and other heat-resistant products, and can improve the flame retardant performance of EPDM cable jacket and improve the electrical properties of CSM. Zhejiang Huangyan Donghai Chemical Plant has put into operation a vulcanizing agent TCY, a trimeric thiocyanate that is suitable for acrylate rubber and can be vulcanized for a period of time.

4 Vulcanization accelerator Zhenjiang No. 2 Chemical Plant has promoted or granulated accelerator powder to eliminate dust pollution. Shenyang Northeast Auxiliary Plant has successfully developed a “three drops” synthesis process, and the quality of the produced accelerator DZ is good. Zibo Yinghui Rubber Auxiliary Co., Ltd. produces NS quality and plans to expand production capacity. The DNBT, an accelerator produced by Shanghai Rubber Auxiliary Plant, is a 2-(2,4 dinitrophenylthio)benzothiazole, which is safe for mixing and is used for long-sulfur thick section products.

5 Drying resin Tackifying resin is mainly used to improve the self -adhesion of rubber, especially synthetic rubber. In recent years, after the group of Shanxi Province Institute of Chemical Industry put into production of alkyl phenolic resin 2O3, 204 and modified tall oil rosin resin 207, it successfully developed a tackifying resin 209 for EPDM, improved the self-adhesion and processing performance of EPDM, and applied to conveyor belts. And other products. The long-acting moisture-resistant and high-tackifying resin TKM developed by Beijing Rubber Research and Design Institute has been manufactured by Changzhou Changjing Chemical Co., Ltd.

6 Reinforced resin Reinforced resin, also known as reinforced and hardened resin, is used in compounds that require high hardness, high elongation, and are difficult to produce due to excessive carbon black. In the past, zipper polyesters were used in groceries. In recent years, the main use of modified phenols produced by the Shanxi Provincial Institute of Chemical Industry was resin 2O5 and 206 (containing curing agent), which increased the hardness of plastic materials. Recently, the institute and the Beijing Rubber Industry Research and design institutes have successfully developed oil-modified and fatty acid-modified phenol awakening resins with excellent hardening effects.

7 Peptizers Plastizers are divided into two categories: chemical peptizers and physical peptizers. Chemical peptizers accelerate the decomposition of rubber and improve plasticizing efficiency, such as SJ-103 pentachlorothiophenol produced by Wuhan Luohe Chemical Factory. Active agent + dispersant mixture. Physical plasticizers, also known as physical plasticizers, act as internal lubricants during mixing, and are generally zinc soaps that are soluble in rubber. The plasticizer A produced by Wuhan Luohe Chemical Plant is suitable for internal mixers. The Z-210E produced by the Beijing Rubber Industry Research and Design Institute has a low melting point and is particularly suitable for use in open mills.

Dispersant Dispersants mainly improve the dispersion of carbon black and other powders in rubber. The Gelyi T78 produced by Qingdao Oncom Rubber & Plastic Technology Co., Ltd. is a carbon black dispersant, which can shorten the mixing time, improve the dispersion of carbon black and other powders in rubber, increase the extrusion speed, and stabilize the extrusion size. Reduce the extrusion temperature. The company's JV B-52 is a white carbon dispersant that promotes the dispersion of silica and other inorganic fillers in the rubber and prevents early scorch and blooming of the compound. The FS-97, which was put into operation in the Wuhan Runhe Chemical Plant in recent years, is also a carbon black dispersant.

9 Coupling agent Nanjing Shengguang Chemical Factory produces a series of silane coupling agents for the treatment of silica-containing fillers such as silica. The aluminate coupling agent produced by Fujian Normal University is used to treat inorganic fillers such as calcium carbonate and fly ash. The indium-titanium composite coupling agent produced by the Shanxi Institute of Chemical Industry is a solid waxy substance used to treat talc. Calcium carbonate and other inorganic fillers.

10 Other varieties There are many other new products, such as the RF series resorcinol-formaldehyde resin produced by Changzhou Shuguang Chemical Factory. Its softening point is above 90°C. It is an improvement product for RE resin adhesives with low softening point and easy to absorb moisture. . Moldova 935P, produced by Qingdao Ongji Rubber & Plastic Technology Co., Ltd., is an internally added mold release agent that can be added directly during mixing, automatically keeping the mold clean and bright, removing mold contamination, and enhancing the fluidity of the rubber, and helping the packing. Disperse and improve the finish of the product. The large specific surface active zinc oxide produced by the Weishan County Welfare Chemical Plant in Shanxi Province is a highly effective vulcanizing agent for rubber, with good dispersion and less addition.