Consumption Of Vat Dyes At Home And Abroad

As we all know, cotton is one of the most widely used textile fibers in the world. Since the beginning of the new century, the average annual cotton consumption in the world has exceeded 19 million 500 thousand tons. In 2003, the world cotton output was 20 million 540 thousand tons, and its consumption was close to 20 million tons. In 2004, because of the rise in cotton prices, the cotton sowing area increased by 7.3% over the previous year, reaching 34 million 710 thousand hectares, and the climatic conditions of the main cotton producing areas were suitable for making the unit yield increase greatly, the world cotton output was estimated to exceed 23 million tons, reaching 23 million 350 thousand tons, an increase of 13.7% over the previous year.

Cotton consumption is estimated to exceed 23 million tons, so the demand for dyestuffs for cotton is significantly improved, from the present world.

In terms of consumption of dyes, the largest dye consumed is reactive dye, about 18.0-20.0 million tons. The annual consumption of vat dyes is about 25 thousand tons and fifth of cellulose dyes are used.

The annual consumption amount exceeds 1 billion 400 million US dollars, accounting for 50% of the total consumption of dyes, while the annual consumption of vat dyes is about 470 million dollars, accounting for 17% of total dye consumption, and second of cellulose dyestuffs. We can see that vat dyes still occupy an important place in cellulose and dyestuff dyes. Moreover, vat dyes do not contain azo groups, which are non heavy metal types. Moreover, they have no special biochemical treatment problems as a pigment type compound. Besides, these dyes have a larger space for industrial fabrics, so that vat dyes can not be completely replaced by other dyes at present. It should be said that it is a kind of high quality cotton dyestuffs and can be used to produce high added value and functional textile products. Calculation, reactive dyes

China is the largest cotton producing country in the world (Table 1) and cotton consumption country. In 2003, China's cotton output was 23.6% tons, accounting for 23.6% of world cotton output. In 2003, China's cotton consumption was 5 million 200 thousand tons, accounting for 25.3% of world cotton consumption. In 2004, cotton production in China was estimated to reach 6 million 423 thousand tons, an increase of 32.3% tons over the previous year, and an estimated consumption of 6 million 200 thousand tons. This determines that the production and consumption of dyestuffs in China's cellulose industry is the largest in the world. The output in 2003 is about 220 thousand tons, accounting for about 22.0-23.0% of world total dye production and about 47.5% of total dye consumption in the world, of which the output of vat dyes is about 12 thousand tons, which accounts for the world's output of vat dyes.

China's entry into the new century

The average annual growth rate has reached about 10%, and the development is relatively fast. In addition to the factors of export growth (Table 2), in order to improve the quality of textiles and meet the higher requirements of dyeing and finishing fastness, dyeing and printing with more vat dyes is also a very important factor.

In addition, in order to make up for the shortage of varieties, China imports vat dyes annually, about 1/5 of the export volume of China's vat dyes, and the average import price is less than 90% of the average export price of China's vat dyes.