The results of the "30,000 tons/year rare earth isoprene rubber complete industrialization technology" developed by the Changchun Institute of Applied Chemistry of the Chinese Academy of Sciences have recently passed the results of the organization organized by the Chinese Academy of Sciences. 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.
The result is based on self-developed catalyst, polymerization, coagulation and post-treatment technologies, and integrates advanced reactor technology, automatic control technology and energy-saving and environmental protection technology to develop the first domestic 30,000 tons/year rare earth isoprene rubber technology package. The largest industrial production unit with single line capacity at home and abroad has been built. Based on the proposed new mechanism of rare earth catalyzed diolefin polymerization, the developed catalyst has the characteristics of high activity, high cis orientation, low cost and controllable product molecular weight and its distribution (Mw/Mn≤2.5). The catalytic activity reaches 0.18kg rare earth lanthanum/ton of rubber. The utilization rate of rare earth elements is increased from the traditional 8%-10% to nearly 100%. The polymerization time is reduced from the original 6-7 hours to the current 3 hours, which is nearly 1% higher than the foreign catalyst efficiency. Times, the cis content of the product is over 97%. The company has developed a multi-tank continuous series polymerization, coagulation, post-treatment and solvent recovery technology suitable for high-viscosity glue systems, including a number of patents and know-how, while solving the heat balance and transmission of rubber glue such as high viscosity system. In addition to engineering and technical problems, the overall energy consumption of the whole set of equipment is reduced by 20% compared with similar foreign processes.
Certified by China National Rubber Industry Association Material Testing and Research Center, the performance of industrialized products exceeds the level of similar foreign products, and can completely replace natural rubber for all-steel radial truck tire tread rubber. At present, the complete set of technology has applied for 73 domestic and foreign invention patents, of which 35 have been authorized to form an independent intellectual property system. Compared with the existing similar technologies in foreign countries, the complete set of technical achievements has the characteristics of the largest single-line production capacity, the lowest energy consumption, the energy saving and environmental protection, and the catalyst cost per ton of isoprene rubber products is reduced to less than 800 yuan. It is 20% lower than foreign countries. More importantly, it is the first time that rare earth isoprene rubber has completely replaced natural rubber for tire production. It has got rid of China's complete dependence on natural rubber, and has enhanced the overall technological level of China's rubber industry and promoted China's large varieties. The research and development of synthetic rubber independent production technology is of great significance.
Titanium Dioxide(TIO2)
Titanium dioxide is an important inorganic chemical pigment, the main component is titanium dioxide. The production process of titanium dioxide has two process routes: sulfuric acid method and chloride method. It has important applications in coatings, inks, papermaking, plastics and rubber, chemical fiber, ceramics and other industries.
It has two types: rutile type (Rutile R type) and anatase type (Anatase A type). The rutile crystal structure is compact, relatively stable, and has low optical activity, so it has good weather resistance, and has high hiding power and decolorizing power.
Titanium dioxide is widely used in coatings, plastics, rubber, ink, paper, chemical fiber, ceramics, daily chemicals, medicine, food and other industries.
The coating industry is the largest user of titanium dioxide, especially Rutile Titanium Dioxide, most of which is consumed by the coating industry. The paint made of titanium dioxide has bright colors, high hiding power, strong tinting power, low dosage, and many varieties. It can protect the stability of the medium, and can enhance the mechanical strength and adhesion of the paint film to prevent cracks. Prevent the penetration of ultraviolet rays and moisture, and extend the life of the paint film.
The plastics industry is the second largest user. Adding titanium dioxide to plastics can improve the heat resistance, light resistance, and weather resistance of plastic products, improve the physical and chemical properties of plastic products, enhance the mechanical strength of the products, and extend the service life.
The paper industry is the third largest user of titanium dioxide. As a paper filler, it is mainly used in high-grade paper and thin paper. Adding titanium dioxide to the paper can make the paper have better whiteness, good gloss, high strength, thin and smooth, no penetration during printing, and light weight. Titanium dioxide for papermaking generally uses Anatase Titanium Dioxide without surface treatment, which can act as a fluorescent whitening agent and increase the whiteness of paper. However, laminated paper requires the use of surface-treated rutile titanium dioxide to meet the requirements of light resistance and heat resistance.
Titanium dioxide is also an indispensable white pigment in advanced inks. The ink containing titanium dioxide is durable and does not change color, has good surface wettability and is easy to disperse. The titanium dioxide used in the ink industry has rutile type and anatase type.
The textile and chemical fiber industry is another important application field of titanium dioxide. Titanium dioxide for chemical fiber is mainly used as a matting agent. Since the anatase type is softer than the gold red type, the anatase type is generally used. Titanium dioxide for chemical fiber generally does not require surface treatment, but in order to reduce the photochemical effect of titanium dioxide and prevent the fiber from degrading under the action of titanium dioxide photocatalysis, surface treatment is required for some special varieties.
The enamel industry is an important application field of titanium dioxide. The enamel grade titanium dioxide has high purity, good whiteness, fresh color, uniform particle size, strong refractive index and high color reducing power, and has strong turbidity and Opacity, make the coating thin, smooth and strong acid resistance after enamelling. It can be evenly mixed with other materials in the enamel manufacturing process, does not agglomerate, and is easy to melt.
The ceramic industry is also an important application field of titanium dioxide. Ceramic grade titanium dioxide has high purity, uniform particle size, high refractive index, excellent high temperature resistance, and does not change ash at 1200°C for 1 hour. High opacity, thin coating, light weight, widely used in ceramics, construction, decoration and other materials.
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