Titanium dioxide (also known as titanium dioxide) is an ultrafine powder with very stable chemical and physical properties, due to its high refractive index and small particle size. Therefore, it has good adhesion and whiteness, and is widely used in the chemical fiber industry, such as polyester, acrylic, nylon, viscose, etc., and has a very good matting effect. Adding 0.3% titanium dioxide to chemical fibers can significantly reduce the gloss of the fiber, reduce transparency, and enhance the dyeing effect and strength. Although its usage only accounts for about 2%-3% of the world’s total titanium dioxide production, the quality requirements of this product are extremely strict. Due to the special requirements of chemical fiber production and spinning, the particle size of titanium dioxide used for chemical fiber is generally controlled within 0.2-0.5urn, it also requires a narrow and uniform particle size distribution, low impurity content, good dispersion stability, low filtration resistance, and no effect on fiber strength and post-spinning processing after matting, so the product has high added value. Titanium dioxide for chemical fiber is usually anatase type and is produced by the sulfuric acid process. However, the environmental protection restrictions on the production of titanium dioxide by sulfuric acid method in foreign countries have made the proportion of sulfuric acid products in the total global production of titanium dioxide decrease, which makes chemical fiber Titanium dioxide is more popular and expensive in the market. In addition, the production process of titanium dioxide for chemical fiber matting includes: the clarification process of the powder (that is, the process of dissolving the precipitated crystal nucleus into powder particles); the process of powder dispersion, surface modification and microcapsule coating; the drying process of the powder ; Powder crushing and collection process.
It is worth mentioning that in recent years, Shanghai Yuanjiang Chemical Co., Ltd. has succeeded in the research and development of chemical fiber grade titanium dioxide. The company undertook the science and technology research project of the Municipal Science and Technology Commission "Research and Development of Chemical Fiber Grade Titanium Dioxide", researched new seed crystal preparation and pressure hydrolysis technology, focusing on the particle size distribution, impurity element content and dispersibility in ethylene glycol And other technical problems, produced kilogram samples. Its technology has reached the domestic advanced level, laying the foundation for the industrialized production of polyester chemical fiber grade titanium dioxide in China.
Second, the titanium dioxide industry is facing pressure to survive
While my country's food grade titanium dioxide industry is developing rapidly, there are also some problems. Like most industries in China, my country's titanium dioxide industry has made large blind investments in recent years, resulting in an excessive proportion of low-level and low-tech products in the industry, too many small-scale enterprises, fierce competition at low prices, and the expansion of advantageous production capacity has not been effective Market realization. Especially this year, with the impact of rising raw materials, appreciation of the renminbi, and cancellation of export tax rebates, some titanium dioxide companies in my country are facing severe challenges. In addition, the influx of foreign capital has exacerbated the survival pressure of domestic titanium dioxide companies.
