The hottest research and development of rubber add

Research and development of rubber additives technology in China

after nearly 50 years of development, China's rubber additives industry has more than 80 production units, with an annual production capacity of more than 150000 tons and more than 200 kinds of additives. Anti aging system, vulcanization system and processing operation system additives are produced, and the main varieties are exported in addition to meeting domestic demand. In 1998, 5134 tons of accelerators and 2666 tons of antioxidants were exported

in recent years, a new variety

1 anti reversion agent anti reversion agent is the latest kind of additives at home and abroad, which is specially used to improve the anti reversion property of vulcanized rubber. Shanxi Institute of chemical industry has developed and put into production a series of varieties. The multifunctional anti reversion agent dl-268 of the Institute can endow the ordinary sulfur curing system with good reversion resistance and heat resistance, improve the bonding strength between fiber cord and rubber, and has a high retention rate. It is suitable for cord rubber products. The heat-resistant vulcanization activator sl-273 of the Institute is a zinc soap with optimized structure. It is the lowest price of anti reversion agent at present. It is suitable for the vulcanization of diene rubber, especially natural rubber. It can improve the anti reversion of rubber vulcanization at high temperature and for a long time, improve heat resistance and crosslinking degree, reduce dynamic heat generation, and improve hardness. It is not only suitable for large thick products. High temperature rapid vulcanization process and heat-resistant products, and in the silica compound, it can replace part of the silane coupling agent and improve the rheological properties. The multifunctional plasticizer A-256 of the institute not only has the effect of anti reversion and improving heat resistance, but also has the function of plasticizer a to reduce the viscosity of rubber and improve the fluidity of rubber

the post vulcanization stabilizer hs-258 launched by the Institute in 2000 is equivalent to the HTS of huilishi company. It is used in ordinary sulfur vulcanization system and semi effective vulcanization system to improve the reversion resistance, heat resistance and dynamic performance of vulcanization. It can also be used as the adhesion promoter of steel cord and rubber and the dynamic performance modifier of SBR. In conclusion, the anti reversion agent can be regarded as both a new auxiliary agent of the vulcanization system and a new auxiliary agent of the anti-aging system. It has the advantages of protecting the vulcanization complex to make it stable, improving the heat and oxygen stability of the product, and maintaining the good dynamic performance of the ordinary vulcanization system and the semi effective vulcanization system

2 antioxidant the variety of antioxidant is more complete, and the internal quality is further improved. Nanjing Chemical Plant granulates phenylenediamine antioxidant 4020 and 4010NA, with a total production capacity of 12500, making a monkey named "Jianhui" like a ton of steel soldiers in Avatar. The factory increased the content of dimer and trimer in antioxidant RD, thus improving the comprehensive protection effect. Hs-9ila produced by Zhejiang Huangyan Huaxing Chemical Factory is the reaction product of H aniline and unsaturated aromatics, which is adsorbed by fillers. The pollution shows many special properties, such as non migration, fluorescence, piezoelectricity, ability to absorb and scatter ultraviolet rays, and has slight staining. It is suitable for color cables and sheath compounds. Phosphite antioxidant TNP is produced by Longshan Chemical Plant of Jihua company. It has no color change and pollution, especially in SBR, it has outstanding oxidation resistance

3 vulcanizing agent Shanghai Jinghai Chemical Co., Ltd. has successfully developed a non-aqueous phase continuous high-temperature polymerization process to produce ISHS series insoluble sulfur, forming a series of products with the company's series. The new product has good thermal stability and is easy to disperse. Shanxi Institute of chemical industry optimized the process to produce desertification octyl phenol vulcanization resin (201) type 1 and type 2 products, octyl phenol vulcanization resin (202), which is suitable for vulcanization of butyl rubber to make medical corks. Sealing gaskets and heat-resistant products do not need to add activators when using 201, and the products have good heat resistance, ozone resistance and flexibility. The new process produces the co crosslinking agent hv268, which has the same performance as the imported hvaz. It is suitable for EPDM, nbrir and other heat-resistant products, and can improve the flame retardancy of EPDM cable sheath and improve the electrical properties of CSM. Zhejiang Huangyan Donghai chemical plant has put into production the vulcanizing agent tcy, which is a kind of thiocyanate, which is suitable for acrylate rubber and can be vulcanized in one stage

4 vulcanization accelerator Zhenjiang second chemical plant filled accelerator powder with oil or granulated, eliminating dust pollution. Shenyang Northeast additives general factory has successfully developed the "three drop addition" synthesis process, and the accelerator DZ produced is of good quality. The NS produced by Zibo Yinghui rubber additives company is qualified and plans to expand its production capacity. The accelerator dnbt produced by Shanghai rubber additive factory is 2- (2,4 dinitrophenylthio) benzothiazole. What should I do if the pointer fails? The mixing operation is safe. It is used for thick section products that are vulcanized for a long time

5 withering resin tackifying resin is mainly used to improve the self viscosity of rubber, especially synthetic rubber. In recent years, after the group of Shanxi Chemical Industry Research Institute put into production alkyl phenolic resin 2O3, 204 and modified tall pine resin 207, it has successfully developed tackifying resin 209 for EPDM, which improves the self-adhesive and processability of EPDM and is suitable for conveyor belts and other products. Beijing Rubber Research and Design Institute has successfully developed a long-acting moisture-resistant and high tackifying resin TKM, which has been produced by Changzhou Changjing Chemical Co., Ltd

6 reinforcing resin reinforcing resin, also known as reinforcing and hardening resin, is used in compounds that require high hardness, high elongation and are difficult to produce due to excessive carbon black. In the past, neat polyester was used in sundries. In recent years, modified phenolic resin 2o5 and 206 (containing curing agent) produced by Shanxi Institute of chemical industry were mainly used to improve the hardness of rubber. Recently, the Institute and Beijing rubber industry research and Design Institute have successfully developed oil modified and fatty acid modified phenolic reinforcing resin, with excellent hardening effect

7 plasticizers plasticizers are divided into chemical plasticizers and physical plasticizers. Chemical plasticizers accelerate the decomposition of rubber and improve the plasticizing efficiency, such as sj-103 pentachlorophenol + active agent + dispersant mixture produced by Wuhan Jinghe chemical plant. Physical plasticizers, also known as physical plasticizers, play an internal lubricating role in mixing. They are generally zinc soaps soluble in rubber. Plasticizer a produced by Wuhan Jinghe chemical plant is suitable for internal mixer. Z-210e produced by Beijing rubber industry research and Design Institute has low melting point and is especially suitable for open mixer

8 dispersant dispersant mainly improves the dispersion of carbon black and other powders in rubber. Jiaoyisu T78 produced by Qingdao ANGJI rubber and 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, improve the extrusion speed, stabilize the extrusion size, and reduce the extrusion temperature. The problem that the company's jiaofuli B-52 needs to check whether the universal experimental machine has a path is the silica dispersant, which can promote the dispersion of silica and other inorganic fillers in the rubber and prevent the early scorching and frost spraying of the rubber. Fs-97 produced by Wuhan Jinghe chemical plant in recent years is also a carbon black dispersant

9 coupling agent Nanjing Shuguang Chemical plant produces a series of silane coupling agents for the treatment of silica containing fillers. Aluminate coupling agent produced by Fujian Normal University is used to treat inorganic fillers such as calcium carbonate and fly ash. The Ming Ti composite coupling agent produced by Shanxi Institute of chemical industry is a solid waxy material used to treat talc. Inorganic fillers such as calcium carbonate

10 there are many other new products of other varieties, such as RF series resorcinol formaldehyde resin produced by Changzhou Shuguang Chemical Plant, whose softening point is above 90 ℃, which is an improved product of re resin adhesive with low softening point and easy moisture absorption. Modley 935P produced by Qingdao ANGJI rubber and Plastic Technology Co., Ltd. is an internally added release agent, which can be directly added during mixing, automatically keep the mold clean and bright, remove mold pollution, enhance the fluidity of rubber, help the dispersion of fillers, and improve the smoothness of products. The large specific surface area active zinc oxide produced by Shanxi Jishan Welfare chemical plant is a high-efficiency vulcanizing activator for rubber, with good dispersion and less addition