What’s the sources of formaldehyde from clothing?
2015-10-21 17:08 | writer: admin
Formaldehyde is one volatile compound, usually used in textile for crease-resist and shrink-resist compound agent, which also used as dye-fixing agent, water-proofing agent, softening agent and binding agent on production, widely used. Formaldehyde also is one irritation compound, easy caused skin allergy reaction and body airway etc illness. Fewer formaldehyde will have irritation effect on eyes / skin and mucosa, excess formaldehyde will make the mucosa and airway have heavy inflammation, also can cause dermitis.
Japan ‘s clothing eco standard have the clear limitation on the percentage of formaldehyde.
Chinese national textile product basic safe technical specification (GB/T18401-2003) request: infant and child products (A class)’s formaldehyde content cannot over 20mg/kg, directly touched skin product (B class)’s formaldehyde content cannot over 75mg/kg, non-directly touched skin product (C class)’s formaldehyde content cannot over 300mg/kg.
During textile processing, formaldehyde mainly coming from below 3 aspect:
（1）Creasing management: cross-linking agent with formaldehyde still widely used on crease-resist/ anti-wrinkle and noniron arrangement, if using inappropriately, which will cause it’s concentration over allowed range.
（2）Increase color fastness: cheaper formaldehyde agent usually used on direct dyeing, at times used on activity dyeing for after arrangement. According to the recipe, on A class products, its content is easy exceed the limit of 20mg/kg, even exceed 75 mg/kg limitation of B class products. Nowadays there are cationic auxiliary with fewer or non formaldehyde, such as tin A/B type.
（3）Pigment printing: high quality ‘s cross-linking formaldehyde widely used on pigment printing craft, which means even used carefully , it scarcely possible conform 75mg/kg limitation. Now there have cross-linking agent with lower formaldehyde, that is to say, in the agent with urea and formaldehyde, used together will reach the non-formaldehyde pigment printing target.
Usually permanent crease-resist and anti-shrink arrangement agent used textile easy to test exceed standard formaldehyde existing.