Sources of formaldehyde in clothing
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Clothing formaldehyde textiles city textile flame retardant fabrics
Formaldehyde is a volatile compound that is usually used as a synthetic reagent for anti-wrinkle and anti-shrinkage finishing agents for textiles. It is used in color fixing agents, waterproofing agents, softeners, adhesives, etc., covering a wide range of applications. Formaldehyde is also an irritating compound that can easily cause skin allergic reactions and human respiratory tract diseases. A small amount of formaldehyde can cause irritation to people’s eyes, skin and mucous membranes. Excessive formaldehyde can cause severe inflammation of mucous membranes and respiratory tracts, and can also lead to dermatitis.
The clothing environmental protection standards of Japan and other countries have clear restrictions on formaldehyde.
China’s National Basic Safety Technical Specifications for Textile Products (GB/T18401-2003) also stipulates that the formaldehyde content of infant products (Category A) shall not exceed 20 mg/kg, the formaldehyde content of products in direct contact with skin (Category B) shall not exceed 75 mg/kg, and the formaldehyde content of products in indirect contact with skin (Category C) shall not exceed 300 mg/kg.
In the textile processing process, formaldehyde is mainly produced in the following three aspects:
( 1) Anti-wrinkle finishing: Formaldehyde-containing cross-linking agents are still widely used in anti-wrinkle, anti-wrinkle and no-iron finishing. Improper use will cause its concentration to exceed the allowable range.
(2) Improve color fastness: Cheap formaldehyde-containing additives are often used for direct dyes and occasionally for post-processing of reactive dye dyeing. . Depending on the formulation used, its content in Category A products can easily exceed the 20mg/kg limit, or even exceed the 75mg/kg limit for Category B products. Cationic additives containing a small amount or no formaldehyde are now available on the market, such as Scilly A and B types.
(3) Pigment printing: High-quality formaldehyde-containing cross-linking agents are widely used in the pigment printing process, which means that even if they are used with great care It is almost impossible to meet the 75mg/kg limit. Cross-linking agents with extremely low formaldehyde content are now available. That is, when urea is present, the use of reagents with formaldehyde can achieve the purpose of formaldehyde-free paint printing.
Usually, textiles stiffened with permanent anti-wrinkle and anti-shrink finishing agents are prone to excessive levels of formaldehyde.
The flame-retardant fabrics and protective clothing produced by City Textile will contain a certain amount of formaldehyde due to the proban or CP flame-retardant process, but they comply with Oeko- Tex Standard 100 Class 2 requires that general flame-retardant protective clothing will not be worn close to the body, so the formaldehyde content within the specified range will not cause harm to the human body.
：City
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