Chemical profiling refers to the qualitative, quantitative and structural analysis of complex chemicals. It is characterized by the combined use of multiple separation and analysis methods, that is, "comprehensive analysis". Comprehensive analysis is a more cutting-edge subject in analytical science. It is actually beyond the scope of qualitative and quantitative analysis of classic analytical chemistry for the comprehensive analysis of the complex and multi-component chemicals. It not only requires profiling workers to have a deep chemical foundation separation technology, chemical analysis technology is more important is to have a variety of modern instruments to analyze NMR, MS, IR, UV, GC, GC-MS, HPLC, HPLC-MS, X- Ray and other technologies as well as the flexible use and comprehensive analysis capabilities of these technologies.
Textile auxiliaries are some auxiliary chemicals added in the various processes of textile processing. These chemicals can play a role in improving processing efficiency or giving textiles special effects to produce high added value. These chemicals can be some simple chemical substances such as soda ash, etc., or they can be complex compounds or reaction products of various chemical substances with complex compositions. The chemical analysis of textile additives is mainly aimed at those textile additives with complex composition. At present, there are many printing and dyeing auxiliary plants, especially small-scale private and township enterprises that use traditional methods to produce various auxiliary agents. The lack of technical force for product development makes some products not meet the market requirements or are in a disadvantaged position in market competition. In the current fierce competition in the auxiliaries industry, foreign imported auxiliaries continue to enter the domestic market. If we do not actively develop environmentally friendly new auxiliaries to improve product quality, we will not be able to adapt to the requirements of the times and will be eliminated by the market. Therefore, it is of great significance to apply chemical analysis methods to analyze textile additives and develop new additives.
The role of chemical analysis in the development of textile additives
1. R & D of new products of textile additives. Direct analysis of products for reference plus their own creation is a good way to develop a new product.
2. It is an important job to understand the latest developments of similar products at home and abroad and closely watch the technical trends of products in the same industry. Analysis work can obtain first-hand information of advanced technology in the fastest way. 3. Direct imitation of additives. Profiling is a shortcut to directly imitate chemicals. It makes the investment of imitation less and the cycle shorter, and the effect is faster. It is undoubtedly a quick way to analyze new products without infringing intellectual property rights. This article introduces some common chemical analysis methods and discusses the general methods and steps of chemical analysis in textile auxiliaries by applying examples
Basic knowledge required for chemical analysis of textile additives
Knowledge of textile auxiliaries includes knowledge of the classification and application of textile auxiliaries and the chemistry of their constituent substances, such as surfactants. Knowledge of analytical chemistry includes analytical methods and separation techniques. The analysis of surfactants is a difficult subject. It often coexists with inorganic, organic and high polymers. The analysis is to separate and enrich surfactants from these complex systems. Because of the molecular structure containing hydrophilic and affinity The two surfactants of the same group of oils may be soluble in a variety of solvents with different polarities, making conventional extraction and chromatographic separation difficult. Due to the uncertainty of their molecular weight, such as alkylphenol polyoxyethylene surfactants When the polymerization degree of the agent is less than 4, it is oil-soluble and soluble in organic solvents such as benzene. When it is greater than 8, it is water-soluble. 4 to 8 are both soluble and form an emulsion. In the analysis, it is necessary to determine the functional group, average polymerization degree and molecular weight, etc. Therefore, the analysis of the mixed sample of the surfactant is a typical example of a complex system.
Textile additives are necessary chemicals in textile production and processing
Textile additives are necessary chemicals in textile production and processing. Textile additives have an indispensable and important role in improving the product quality and added value of textiles. It can not only give textiles various special functions and styles, such as softness, wrinkle resistance, shrinkage resistance, waterproof, antibacterial, antistatic, and flame retardant. Etc., can also improve the dyeing and finishing process, play a role in saving energy and reducing processing costs. Textile auxiliaries are essential to improve the overall level of the textile industry and its role in the textile industry chain.
About 80% of textile auxiliary products are based on surfactants, and about 20% are functional additives. After more than half a century of development, the surfactant industry worldwide has matured. In recent years, the production center of the textile industry has gradually shifted from traditional Europe and the United States to Asia due to well-known reasons, resulting in a rapid increase in the demand for textile additives in the Asian region.
At present, there are nearly 100 textile auxiliaries worldwide, producing nearly 16,000 varieties, with an annual output of about 4.1 million tons. Among them, there are 48 categories and more than 8,000 varieties of textile additives in Europe and America; there are 5,500 varieties in Japan. According to reports, in 2004 the world textile additives market sales reached 17 billion US dollars, far exceeding the sales of the dye market that year.
There are nearly 2,000 varieties of textile auxiliaries that can be produced in China, more than 800 varieties are often produced, and about 200 are main varieties. In 2006, the output of China's textile additives exceeded 1.5 million tons, and the industry's output value was 40 billion yuan, which also exceeded the output value of China's dye industry.
There are about 2,000 manufacturers of textile additives in China, mostly private enterprises (8-10% of joint ventures and wholly-owned enterprises), mainly concentrated in Guangdong, Zhejiang, Jiangsu, Fujian, Shanghai, Shandong and other provinces and cities. The textile additives produced in China can meet 75-80% of the domestic textile market demand, and 40% of the production of domestic textile additives is exported to foreign countries. However, domestic textile auxiliaries are still far behind the international advanced level in terms of variety and quality, as well as in synthesis and application technology. Special and high-end textile auxiliaries still have to rely on imports.
The ratio of textile additives to fiber output is 7: 100 in the world, 15: 100 in the industrialized countries such as the United States, Germany, the United Kingdom, and Japan, and 4: 100 in China. According to reports, the world's textile additives account for about one-half of environmentally friendly additives, and China's environmentally friendly textile additives account for about one-third of existing textile additives.
At present, the textile industry, especially the dyeing and finishing industry, has been determined as a heavily polluted industry by the national competent authority. The impact of textile additives on the environment and ecology and the pollution caused by them in the manufacturing process and their application cannot be ignored and need to be resolved urgently. On the other hand, vigorously developing environmentally friendly textile additives in line with ecological development is extremely important for improving the overall competitiveness of the additive industry and improving the quality and technical level of textile additives, and is the key to the sustainable development of the industry. Textile auxiliary products must not only meet the domestic market demand of the dyeing and finishing industry, but also meet the various quality standards of textile exports.
Textile additives have an indispensable and important role in improving the product quality and added value of textiles. It is a necessary chemical in the production and processing of textiles. It can not only give textiles a variety of special functions and styles, such as softness, wrinkle resistance, shrinkage resistance, waterproof, antibacterial, antistatic, flame retardant, etc., but also improve the dyeing and finishing process, play a role in saving energy and reducing processing costs. Textile auxiliaries are essential to improve the overall level of the textile industry and its role in the textile industry chain.
About 80% of textile auxiliary products are based on surfactants, and about 20% are functional additives. After more than half a century of development, the surfactant industry worldwide has matured. In recent years, the production center of the textile industry has gradually shifted from traditional Europe and the United States to Asia due to well-known reasons, resulting in a rapid increase in the demand for textile additives in the Asian region.
