What is cellulose acetate? How to classify

Acetic fiber was born in the early 20th century, and was successfully trial-produced and industrialized in Britain in the early 1920s. At present, it is the second largest variety of cellulose fiber after viscose fiber. Cellulose acetate can be used to make textiles, cigarette filters, film bases, plastic products and so on. At present, the total output of acetate fiber in the world is about 750,000-800,000 tons, accounting for 3% of the total output of chemical fiber and 35% of the total output of cellulose fiber, including 550,000-570,000 tons of cigarette tow and 265,438-250,000 tons of acetate fiber for textile. There are more than 20 acetate fiber manufacturers in the world. The main manufacturers are Calanese Company of the United States, accounting for 45%, and Eastman Koclak Company, accounting for 9. 3%, American companies accounted for 5. 5%, Italy Novaceta Company, accounting for 15. 6%, Japan's Mitsubishi acetate fiber company accounted for 6. 0%, Teijin Company, accounting for 5. 2%, and Kautaurz, a British company, account for about 90% of the world's total output.

At present, the technology of acetate fiber is monopolized by several large foreign companies. In addition to cigarette tow and pharmaceutical and chemical tow, there are more than a dozen varieties of acetate fiber for textile. The United States, Britain, Canada, Italy and other countries are now accelerating the development of new varieties to meet the needs of the popular fabric market. At present, the price of acetate fiber in the international market is about 4600 US dollars/ton for filament and 3830 US dollars/ton for tow.

However, the acetate fiber industry in China started late. Since the late 1950s, its variety has been limited to cigarette acetate tow, and textile acetate fiber has been imported. China's textile acetate fibers are mainly imported from Celanese Company of the United States, Mitsubishi Company of Japan and Kautaurz Company of the United Kingdom. The annual import volume is about 2000 tons. In addition, more than 7 million meters of fabrics and a considerable amount of acetate filament fabrics are directly imported. The annual demand for acetate fiber in China is about 1 10,000 tons. At present, the domestic market price of acetate fiber is about 36,000 ~ 38,000 yuan/ton.

The main manufacturers of acetate fiber and acetate fiber tow in China are Nantong acetate fiber Co., Ltd., Guangdong Xinhui acetate fiber factory, Xi 'an Huian chemical plant, Jilin chemical plant, Wuxi film factory, Baoding film factory, Guangdong Zhongshan sugar-coated acetate fiber test workshop, Zhuhai acetate fiber company and Kunming acetate fiber company, with a total output of about 5. 50,000 tons of vinegar chips, 9. 60,000 tons trailer.

As a filter material for cigarettes, cellulose acetate has good elasticity, non-toxic, tasteless, good thermal stability, small suction resistance and remarkable filtering effect, and can selectively adsorb harmful components in cigarettes, while retaining a certain amount of nicotine without losing the taste of cigarettes. Since 1953 was put into the market, it has been very popular and has a good market prospect. However, at present, there are still a considerable number of acetate tow imports in China, with a gap of about 20 thousand tons and an import price of about.

Nonwoven fabrics made of acetate staple fibers can be used for surgical dressings and will not adhere to wounds. It is an advanced medical care material. Acetic acid staple fiber can also be blended with cotton or synthetic fiber to make various fabrics with excellent properties.

Acetate filament is the most similar to silk in chemical fiber, with elegant luster, bright dyeing, strong dyeing fastness, soft and smooth hand feeling, light texture, low moisture regain, good elasticity, not easy to wrinkle, good drape, thermoplasticity and dimensional stability. Can be widely used as clothing lining, casual wear, pajamas, underwear and so on. It can also be compounded with vinylon, polyester, nylon filament and silk to make composite yarn. At present, it is favored by consumers in the United States, Britain, Japan, Italy, Mexico, South Korea, Russia, Pakistan and other countries and regions, especially in the United States, where demand exceeds supply. The annual demand in China is about 654.38+100000 tons. Due to the high import price, it is about $4,600/ton. At present, only a small amount of imports, about 2000 tons per year. Many textile mills use substitutes to solve this problem.

According to the quotation of Celanese Company of the United States, to build an acetate filament production line with an annual output of 6,000 tons, it needs to import a complete set of technical equipment of about 60 million US dollars, of which the investment in vinegar chip equipment accounts for about 80% of the total investment, and the investment in acetate filament equipment accounts for about 20% of the total investment. If we take the road of localization and only introduce key equipment, the investment of this scale production line is about 300 million yuan. The unit cost of producing type II acetate filament is about 24,300 yuan/ton, and the unit price of the product is about 3,800 yuan/ton, so the profit and tax of the unit product is 65,438 yuan +0.37 million yuan, the profit is 7,520 yuan, the tax is 2,470 yuan, and the payback period of the investment is about 4. 5~5 years, therefore, investing in the construction of acetate fiber production line in China has good economic benefits and low investment risk.

As far as the development of domestic acetate fiber is concerned, it is mainly to meet domestic demand and reduce imports. The production scale should be selected according to the development of domestic technology, the supply of raw materials and the market demand of products, and then the scale will be expanded with the maturity and perfection of domestic technology. 1. As far as acetate tow is concerned, it is advisable to build a domestic production line with an annual output of 4000-6000 tons and a textile acetate production line with an annual output of 2000-3000 tons, with a total scale of 6000- 10000 tons. 2. As far as the construction mode is concerned, centralized construction of projects such as vinegar chips, tows, filaments and short silk can be considered. 3. As far as production equipment is concerned, most of the production equipment of cigarette vinegar in China has been manufactured, but some key equipment such as crimping machine, spinneret and recovery valve are difficult to manufacture in China and need to be imported. 4. As far as production mode and control mode are concerned, dry spinning and DCS distributed control system are mainly adopted.

In a word, acetate fiber has excellent performance, wide application, high added value, pollution-free production process and renewable raw materials, which is suitable for sustainable development. However, there are still a certain amount of imported acetate tow for cigarettes in China, and the production of acetate filament for textiles is still blank and totally dependent on imports. Therefore, China should increase the development of acetate fiber! It not only saves investment, but also improves its competitiveness in the international market.