In foreign countries, many chemical enterprises have successively developed a variety of color fixing agents between the 1920s and 1930s. However, due to the limitation of scientific and technological level, reactive dyes did not appear at that time. Reactive dyes were invented about 20 years later, so the research was carried out according to the molecular structure characteristics and dyeing properties of direct dyes and acid dyes.
Because the fixing effect of dicyandiamide formaldehyde resin fixing agent containing copper and dicyandiamide formaldehyde resin fixing agent, namely fixing agent y and fixing agent M, was ideal, these two kinds of fixing agents became more popular at that time, and major textile companies bought them one after another and used them for fixing treatment after fabric dyeing.
Later, according to the emergence of reactive dyes, the chemical industry launched a series of studies on the poor fixation fastness of reactive dyes. In order to improve the fastness of reactive dyes, a chemical company once studied the synthesis of color fixing agents from the perspective of weak acidic substances and cations. Since then, there has been more and more research on color fixing agents, but for a long time, the principle of preparing color fixing agents remained at a certain level, and there was no further research and development.
In the 1980s, the color fastness of textiles in the textile industry was indeed improved after color fixing treatment. However, due to the increasing demand and use of color fixing agents, the disadvantages of aldehyde containing color fixing agents began to appear slowly. For example, the hand feel of dyed textiles will become rough and serious, which will cause color change. If the formaldehyde content in textiles is too high, after human body contacts and rubs the fabrics for a long time, It will irritate the skin and fester in serious cases. Therefore, it is imperative to limit the content of formaldehyde. Many foreign countries, including Japan, Germany and many European countries, jointly stipulate that the formaldehyde emission of textiles in direct contact with skin and infant textiles should be less than 75 mg / kg and 20 mg / kg respectively (Japan stipulates that the formaldehyde emission of infant clothing should not be detected); The formaldehyde content of textiles is also subject to mandatory restrictions in China, and the requirements for the formaldehyde content in the color fixing agent are the same as those in foreign standards. Due to the more clear and strict regulations on the content of formaldehyde, the exploration and application of formaldehyde free color fixing agent became the main research object in the later development of textile industry.
As people have higher and higher requirements for the quality of textile clothing, the textile industry has more and more comprehensive requirements for the color fastness of dyed textiles, such as chlorine resistance, sun exposure, wet scalding, soaping, wet dry friction, sweat stains and a series of fastness problems. The most important requirement is that the color fixing agent does not contain formaldehyde or other substances with potential hazards to human body or the environment. When the above conditions are met, We should also consider the feel of the fabric and the comfort of wearing. Therefore, the performance requirements of aldehyde free color fixing agent are very strict in the market, so the research of aldehyde free color fixing agent is a hot topic that needs to be paid attention to and studied by the textile industry now and in the future.
