Acid dyes, also known as anionic dyes, are dyes that are suitable for acidic, weak acid, or neutral conditions, and contain acidic groups in the dye molecules that can bind to the amino groups in protein fiber molecules in the form of ionic bonds. China is a textile country, dyes are important supporting products of the textile industry, so China's dye industry is mature, can produce a variety of products, acid dyes bright color and complete color spectrum, is one of the important subdivisions of commonly used dyes in China.
At this stage, China is the world's largest dye producer, exporter and exporter. Compared with other dyes, acid dyes have a simple structure and cannot be applied to the field of cellulose dyeing, mainly in the fields of wool, silk and nylon dyeing. There are differences in the dyeing properties and dyeing methods of different acid dyes.
Acid dyes mainly include strong acid dyes, weak acid dyes, acid medium dyes, acid complex dyes and other types. Among them, strong acid dyes have the longest development time, such as acid red 1, but the color light and color fastness are poor, and the damage will be caused when dyeing wool; weak acidic dyes such as weak acidic bright blue raw, which have higher color light and color fastness, and there is no damage when dyeing wool, but the dyeing uniformity is poor; acidic media dyes such as acidic media black t, dyed fabrics have the advantages of high color fastness, washability and sun resistance; acid complex dyes such as acidic complex yellow gr, no need for mordant when dyeing, and good color fastness of the fabric.
From the downstream of acid dyes, according to the Data Of Statistics, in 2020, the total output of sheep wool and goat wool in China was 357,600 tons, showing a downward trend since 2017; silk is a specialty of China, China is an important silk producer in the world, from January to June 2021, the silk output of enterprises on the regulations was 22,900 tons, and the output of silk satin was 184.37 million meters, showing a downward trend; in 2020, China's nylon output was 3.8425 million tons, an increase of 9.8% year-on-year. From the perspective of the three major downstreams, the development of the nylon industry is conducive to the growth of demand for acid dyes, but the decline in wool and silk production is not conducive to the development of the acid dye industry.
According to the "2021-2025 China Acid Dye Market Analysis Feasibility Study Report" released by the New Thought Industry Research Center, since 2017, China's acid dye production has shown a continuous downward trend, with an average annual compound growth rate of -11.9% from 2016 to 2020. According to data from the China Dye Industry Association, in 2020, China's acid dye production will be 35,000 tons. China's acid dye industry boom declined.
New Thinking industry analysts said that China's acid dye production enterprises mainly include Zhejiang Longsheng, Yayun Shares, Annoqi, Zhaobo Chemical, Double Butterfly Dye, Merno Chemical, Shengda Ruitai and so on. In the textile industry raw materials, the demand for dyes is small but indispensable, acid dyes are an important product for wool, silk, nylon dyeing, the overall output of the industry is declining, but the market still has room for demand. With the transformation and upgrading of China's textile industry to the high-end development, leading acid dye enterprises with scale, technology, brand, quality advantages, the proportion of market share will continue to increase, the strength of weak enterprise development pressure will increase.