Low Carbon Life Composition The development and application of new pretreatment agents that meet the requirements of low carbon economy (II)

(Continued from the previous issue) 3 High-performance pre-treatment agent High-performance pre-treatment agent is efficient, energy-saving, water-saving and emission-reducing. This is not only a need to replace imported pre-treatment agents, but also to accelerate pre-treatment agent technology It is an important part of upgrading and variety structure adjustment, which plays a great role in the development of low-carbon economy in my country's textile industry.

Utilizing various high and new technologies is one of the effective ways to develop high-performance pretreatment agents. Prominent high-tech technologies in recent years include catalytic technology, green solvent reaction technology, compound synergy technology, biotechnology, recycling technology, nanotechnology and micro-emulsification technology. Catalytic technology in particular is the most vital component of key manufacturing technologies in various countries. It has the characteristics of high selectivity, high yield, high purity, and low pollution. It is an atom-economic reaction technology and can produce significant energy saving and reduction. row effect. Catalytic technologies include: enzyme catalytic technology, phase transfer catalytic technology, molecular sieve catalytic technology, amorphous nickel catalytic technology, metal compound catalytic technology, framework nickel catalytic technology, etc. Compound synergy technology, also known as combination synergy technology or alloy technology, is another important high-tech for developing high-performance pretreatment agents. It has significant effects on saving money, energy, water, emission reduction, and cost reduction. This technology is roughly divided into two methods: one is the external compounding method, which uses two or more additives with different properties to compound according to certain principles and proportions. This is currently the preferred method of domestic and foreign additive manufacturers. The main manufacturing method; the other is the internal compounding method, which is to introduce the functional gene of another auxiliary agent into the molecular structure of one auxiliary agent to give it a new function. The new high-performance pre-treatment agent manufactured using these high-tech technologies can maximize the quality of textile processing, improve work efficiency, save energy and reduce emissions, and save money and consumption.

3.1 High-efficiency pre-treatment agent

Improving the processing capacity and efficiency of the pre-treatment agent is conducive to energy saving, water saving, time saving, consumption reduction, cost reduction and emission reduction. This is also the current development of high-performance pre-treatment agent. One of the important development directions of pretreatment agents. This type of products mainly includes the following 4 types.

3.1.1 High-efficiency emulsifier

Due to its unique elasticity, spandex is widely used to form blended fabrics with other fibers. Polyester/spandex blended fabric is one of them. In addition, There are brocade/ammonia blended fabrics, cotton/ammonia blended fabrics, etc. Polyester/spandex blended fabrics generally use spandex core wrapping and doubling yarns. These yarns are mainly used in underwear, clothing, socks, sportswear, home textiles and other fields. The spandex content is as high as more than 10% or even more than 20%, making spandex spinning difficult. In order for the fiber to pass through the spinneret normally, a small amount of lubricant needs to be added during spinning. The lubricant is mainly silicone oil. The higher the blending ratio of spandex and polyester, the more silicone oil will be contained on the gray cloth. However, the silicone oil present on the gray fabric is difficult to emulsify and must be removed to the greatest extent during or before the printing and dyeing process. Otherwise, the cloth surface will easily produce color flowers, stains, spots, etc. during the printing and dyeing process, and the color fastness will be significantly reduced. . Under normal circumstances, polyester/spandex blended gray fabrics are scouring to remove the silicone oil from the spandex yarn before dyeing. During scouring, a scouring agent, a special silicone oil removal agent for spandex, needs to be added. At present, there are two main types of special silicone oil removal agents for spandex on the domestic market, namely solvent-based and emulsified formulations.

The solvent type is less affected by the refining temperature, but many solvents can cause harm to human health and pollute the ecological environment to varying degrees. However, emulsified formulations cannot use too high a refining temperature because different emulsifiers have different cloud points. When the temperature exceeds their cloud points, the emulsifying ability of the emulsifier is significantly reduced, which greatly weakens the removal effect of silicone oil. In response to this situation, foreign companies mainly develop emulsified dosage forms.

Stockhausen's Sultafon D is a low-foaming and efficient wetting/scouring agent and emulsifier with low bubble properties. It is especially suitable for silicone oils such as silicone oils and minerals that are difficult to emulsify in spandex. Oil removal. The quality of cotton fabrics treated by combining this additive with Solopol ZF (polymer complexing agent) is stable and can be dyed in the same bath. This can reduce processing costs and time by more than 60%, increase processing capacity by 25% to 33%, and greatly Reduce the discharge of contaminated liquid. Depicol PC9 is a high-efficiency emulsifier or environmentally friendly high-performance detergent that effectively removes oil from fabrics with high spandex content, especially silicone oils. It is combined with Setavin PAS (pH buffer for acid dyeing) and Combinations such as Depicol AY (an additive to prevent yellowing during hot-melt fixation of fabrics after dyeing) can enable nylon/ammonia blended fabrics (blend ratio 80:20) to achieve one-bath scouring, dyeing and fixation. Compared with the conventional process, this technology can reduce the processing time by 50% and the dye bath volume by 80%. It greatly improves the dyeing capacity of the equipment and reduces the costs of dyeing, water and drainage, without affecting the dyeing. The color fastness of the material. In addition, the above-mentioned Tissocyl RC9 is also an efficient emulsifier that can remove silicone oil contained in nylon/ammonia blended fabrics.

Our country has also developed some emulsified silicone oil removal agents. Hangzhou Doen Textile Technology Co., Ltd.'s spandex scouring agent CPA? New is a special emulsifier that removes various oils from natural and synthetic fibers. In particular, it can avoid problems caused by incomplete removal of the silicone oil component in spandex oils. Various staining issues.