Application of formaldehyde in textiles
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Formaldehyde textiles pure cotton clothing
The use of formaldehyde is involved in the resin finishing process of clothing. In the production of clothing fabrics, in order to achieve anti-wrinkle, anti-shrinkage, flame retardant and other functions, or to maintain the durability of printing and dyeing, or to improve the feel, formaldehyde needs to be added to the additives.
At present, formaldehyde printing and dyeing auxiliaries are mostly used for pure cotton textiles. Because pure cotton textiles are prone to wrinkles, the use of formaldehyde-containing auxiliaries can improve the quality of cotton fabrics. The stiffness enables ironing-free and wrinkle-proof pure cotton clothing. Textiles containing formaldehyde will gradually release free formaldehyde when people wear and use it, which can cause respiratory inflammation and skin inflammation through human respiratory tract and skin contact, and can also cause eye irritation. Formaldehyde can cause allergies and can also induce cancer. Manufacturers use dyeing auxiliaries containing formaldehyde. In particular, some manufacturers use cheap auxiliaries with extremely high formaldehyde content in order to reduce costs, which is very harmful to the human body.
Uses of formaldehyde
Formaldehyde has a wide range of uses, simple production process and low raw material supply. Sufficient popular chemical products. In addition to being directly used as disinfection, sterilization, and preservatives, formaldehyde is mainly used in organic synthesis, synthetic materials, coatings, rubber, pesticides and other industries. Its derivatives are mainly polyformaldehyde, polyformaldehyde, and phenolic formaldehyde. Resins, urea-formaldehyde resins, amino resins, Uroto products and polyols, etc. The artificial panel industry is developed and the demand for formaldehyde is huge.
Formaldehyde is widely used in synthetic resins, surfactants, plastics, rubber, leather, papermaking, dyes, pharmaceuticals, pesticides, photographic films, explosives, Formaldehyde is used in building materials as well as in disinfection, fumigation and anti-corrosion processes. It can be said that formaldehyde is a generalist in the chemical industry, but the use of anything must have a limit and a standard. Once the use exceeds the standards and limits, it will Will bring disadvantages.
According to relevant experts, in recent years, China has successfully developed formaldehyde-free no-iron finishing agents and formaldehyde-free environmentally friendly urea-formaldehyde resins. However, So far, it has not been put into mass production. The main reason is that it is expensive. It can be seen that the cheap price hinders the replacement process of formaldehyde.
Restrictions on formaldehyde in textile printing and dyeing auxiliaries
Chinese standard GB18401-2003 There are clear and strict regulations on the formaldehyde content in various types of clothing.
Do not use textile auxiliaries that cause the formaldehyde content in textiles that are in direct contact with the skin to exceed 30ppm and that cause the formaldehyde content in all other textiles to exceed 300ppm. Formaldehyde-containing wool protective agents, color-fixing agents, cross-linking agents, adhesives, etc.
Limit the amount of free and partially hydrolyzable formaldehyde in textile dyes and ensure that the amount of free and partially hydrolyzable formaldehyde on the fabric is directly related to the The limit cannot exceed 30 ppm for textiles that come into contact with skin, and the limit cannot exceed 300 ppm for all other textiles.
Heavy metal salts (except iron) or formaldehyde cannot be used as color removers or fading agents in textiles.
City Textile produces functional fabrics and protective clothing The formaldehyde content is within the specified range, and the maximum content does not exceed 300ppm.
：City
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