How to detect formaldehyde content of textiles?
In addition, the textile in the crease-resistant finishing often used in the anti-crease finishing agent monohydroxymethyl dihydroxy vinyl urea, referred to as 2D resin, mainly in order to improve the cellulose fiber and blended fabric wrinkle resistance, shrinkage performance.
2D resin is synthesized by cyclic reaction and hydroxymethylation reaction, and the methylation reaction is accomplished by the addition of formaldehyde.
As a result, the dyed fabric subjected to the fixing treatment will contain formaldehyde;
For example, textile dyeing process, in order to improve the color fastness, the need for color processing, commonly used cationic resin fixing agent Y and fixing agent M, they are dicyandiamide and formaldehyde condensate, containing a high free formaldehyde.
Textiles in the production process to go through pre-treatment, printing and dyeing, finishing and other multi-channel processing procedures, resulting in the presence of residual formaldehyde in textiles.
