A major breakthrough has been made in the new effi

2022-08-16
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A major breakthrough has been made in the new and efficient rare earth catalytic system of synthetic rubber

recently, the Changchun Yinghua Institute of Chinese Academy of Sciences has made a major breakthrough in the research and development and industrial application of the new and efficient rare earth catalytic system of synthetic rubber. The industrial products of rare earth isoprene rubber have been successfully applied to the 10000 ton rare earth isoprene rubber industrialization device with 100% replacement of natural rubber for the first time, breaking away from China's dependence on natural rubber, marking that the application, research and development capacity and production technology of China's rare earth isoprene rubber products have been in the forefront of the world, making the dream of rare earth isoprene rubber created by China and several generations of scientific and technological workers a reality

give full play to basic advantages and seize the development highland

Changchun Chemical Institute is the first unit to carry out synthetic rubber research and development in China. Rare earth catalyzed synthetic rubber is a great contribution made by Changchun Chemical Institute to the world's synthetic rubber field in the 1960s. It not only enriched the theory and methods of coordination polymerization, but also led to the large-scale industrialization of rare earth isoprene rubber, which can replace natural rubber, and rare earth CIS polybutadiene rubber, which can meet the requirements of safe, energy-saving and green tires. After more than half a century of development, there are still a series of bottleneck problems in the synthesis of rubber with rare earth catalytic system, such as low polymerization activity, poor chain structure, microstructure, molecular weight and distribution controllability of synthetic rubber

based on years of scientific research accumulation and good research foundation, the researchers of Changchun Chemical Institute solved the problems of high association of rare earth catalysts from the characteristics of rare earth elements and the basic theory of rare earth catalytic synthetic rubber, proposed a new micro structure formation mechanism of coordination polymerization synthetic rubber, and invented the coordination reversible chain transfer polymerization method. The research results of originality and systematic two-stage amplification timing have been achieved in the aspects of high activity, high stereoorientation, and controllability of molecular weight and its distribution of rare earth catalytic system

grasp the key core and promote major breakthroughs

Changchun Institute of Applied Chemistry takes the innovation of a new generation of catalyst polymerization system as a key breakthrough in promoting the industrialization of rare earth isoprene rubber. Based on the in-depth study of the structure and performance characteristics of rare earth catalysts and rare earth isoprene rubber, a new mechanism for the formation of the microstructure of polyolefin coordination polymers is proposed, It solves the problem that the catalyst structure is not related to the polymer microstructure in the formation mechanism of the microstructure of diolefin coordination polymers proposed by foreign experts, which can not guide the design, synthesis and polymerization practice of catalysts. The new mechanism points out the correlation between the ligand structure and polymerization conditions in the catalyst and the microstructure of the polymer, which can satisfactorily interpret the existing experimental facts, and can guide the design, synthesis and polymerization practice of the catalyst, laying a theoretical foundation for improving the controllability of the microstructure of coordination polymerization synthetic rubber

Changchun Yinghua Institute has made a major breakthrough in the core technology of rare earth catalyst innovation, which is related to the overall situation of large-scale industrialization. It is proposed for the first time that the high association of rare earth compounds is the primary factor for the low polymerization activity and wide molecular weight distribution of rare earth catalysts, and the associated molecular clusters of rare earth catalysts are transformed into single molecular catalysts through ligands with specific structures, successfully developing high activity, high CIS directivity Highly homogeneous and stable rare earth catalyst

Changchun Institute of Applied Chemistry also proposed the theory and method of coordination reversible chain transfer polymerization of synthetic rubber, which changed the chain transfer reaction in the traditional coordination polymerization of synthetic rubber from irreversible to reversible, avoided the termination reaction caused by further improving the water holding capacity and mechanical strength chain transfer, not only improved the utilization rate of rare earth elements, but also changed the polymerization reaction from uncontrollable to controllable, The preparation of synthetic rubber with narrow molecular weight distribution and the functionalization of its chain end have become a reality

the fuselage of the development of complete technology aircraft is mainly made of CFRP (carbon fiber reinforced resin composite), which is a technically innovative 10000 ton device.

the value of scientific research lies in committing to the output of major achievements and making contributions to the people of the country. Through hard work, the scientific researchers of Changchun Yinghua Institute have achieved the successful development of a full set of technical process package of rare earth isoprene rubber industrialization device and the successful completion and operation of a 30000 ton/year industrialized production line, marking that China has become one of the few countries in the world to master the core complete set of technologies for the industrialization of large varieties and high-performance synthetic rubber, and a successful example integrating basic research, engineering amplification, and complete set of technology research and development

the highly active rare earth catalytic system is applied to the 10000 ton rare earth isoprene rubber industrial plant. The catalyst cost per ton of isoprene rubber products is reduced to less than 400 yuan, and the polymerization time is shortened from an average of 7 hours to 2.5 hours, which greatly reduces the production cost, improves the production efficiency, and the product quality reaches the best level of its kind at home and abroad, and realizes the 100% substitution of rare earth isoprene rubber for natural rubber for the first time; Applied to the 10000 ton rare earth cis-1,4-polybutadiene rubber industrial plant, the cost of its main catalyst per ton of cis-1,4-polybutadiene rubber products is reduced to less than 300 yuan, and the product quality reaches the level of similar water at home and abroad, and the test pieces are removed at the same time

reach the international leading level and realize the achievement of "30000 T/a rare earth isoprene rubber complete set industrialization technology" developed by Changchun Institute of chemical industry, which was created in China, and passed the achievement appraisal organized by the Chinese Academy of Sciences in Beijing. The expert group believes that the project as a whole has reached the international leading level, marking that China's rare earth isoprene rubber production technology has been in the forefront of the world. Certified by the material testing and research center of China Rubber Industry Association, the performance of industrialized products exceeds the level of similar foreign products, and can completely replace natural rubber for the tread of all steel radial truck tire

the evaluation results of the testing center of China Rubber Industry Association show that the main characteristics of the whole set of technology are that it takes the independently developed catalyst, polymerization, coagulation and post-treatment technology as the core, integrates advanced reactor technology, automatic control technology and energy-saving and environmental protection technology, develops the first 30000 T/a rare earth isoprene rubber process package in China, and builds an industrial production plant with the largest single line capacity at home and abroad. The design of the process package is reasonable, the operation of the device is stable, the energy consumption and material consumption are low, and the discharge of three wastes is small

based on the new mechanism of rare earth catalyzed diolefin polymerization, the developed catalyst has the characteristics of high activity, high CIS directivity, low cost and controllable product molecular weight and its distribution. The catalytic activity reaches 0.18kg rare earth neodymium/ton of glue, the utilization rate of rare earth elements is increased from traditional% to nearly 100%, the polymerization time is nearly twice that of foreign catalysts, and the CIS content of the product is more than 97%

developed multi kettle continuous series polymerization, coagulation, post-treatment and solvent recovery technologies suitable for high viscosity rubber liquid system, including a number of patents and proprietary technologies, and solved engineering and technical problems such as heat balance and transmission of rubber liquid in high viscosity system. The comprehensive energy consumption of the whole set is 20% lower than that of similar foreign processes

at present, the complete set of technology has applied for 73 invention patents at home and abroad, of which 35 have been authorized, forming an independent intellectual property system. Recently, it won the first prize of the 2014 Jilin Provincial Technological Invention Award. Compared with the existing similar technologies in foreign countries, this complete set of technical achievements has the characteristics of the largest single line capacity, the lowest energy and material consumption, advanced energy conservation and environmental protection, and greatly reduces the catalyst cost. More importantly, for the first time, rare earth isoprene rubber has completely replaced natural rubber for tire production, opening up the market space of rare earth isoprene rubber, and getting rid of China's complete dependence on natural rubber, It has laid an important foundation for strengthening the overall scientific and technological level of China's rubber industry and accelerating the large-scale industrialization of rare earth isoprene rubber in China

note: the reprinted content is indicated with the source. The reprint is for the purpose of transmitting more information, and does not mean to agree with its views or confirm the authenticity of its content

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