Common quality problems in resin finishing
Common quality problems in resin finishing
①Formaldehyde problem:
The formaldehyde content exceeds the standard due to the free formaldehyde in the resin or the formaldehyde decomposed from the resin with N-hydroxymethyl structure. Ultra-low formaldehyde resin or formaldehyde-free resin should be used.
Of course, formaldehyde problems come from a wide range of sources, such as color fixing agents Y and M, softeners MS-20 and S-1, waterproofing agents AEG and FTC, adhesives RF, flame retardants THPC and other additives that sometimes cause formaldehyde. Exceeded. At the same time, formaldehyde migration in the air may also cause formaldehyde on fabrics to exceed the standard.
②Yellowing or discoloration problem:
After resin finishing, yellowing will generally occur, so the pH value, acidic components, and catalyst components of the resin finishing agent must be controlled to minimize yellowing and discoloration.
③Strong descent problem:
Generally, resin finishing will cause a decrease in strength, and fiber protective agents, such as oxidized polyethylene wax emulsions, can be added.
④Feel problem:
Generally, resin finishing will cause the hand feel to become hard, so soft ingredients can be added, but care should be taken not to affect the quality of the resin finishing. The hand feel has improved, and the problem of power drop has also been greatly improved. However, problems such as a hard feel caused by surface resin are caused by the resin itself and drying, and need to be improved accordingly.
Other quality issues:
①Metal ions exceeding the standard:
Metal ions Cu, Cr, Co, Ni, Zn, Hg, As, Pb, Cd, etc. are detected in export products. If they exceed the standard, they will have serious consequences like formaldehyde exceeding the standard. Among additives, there are fewer such metal ions. , but some additives can cause exceeding the standard. For example, the flame retardant antimony trioxide emulsion contains a large amount of mercury, and the waterproofing agent CR, PhoboTexCR (ciba), Cerolc (Sandoz), etc. contain chromium. When using mordant dyes on wool, the mordant dye used is potassium dichromate or sodium dichromate or sodium chromate, and Cr6+ will exceed the standard.
②Color change problem:
After post-finishing, there are many problems with color changes. This requires attention to the selection of dyes during dyeing. When dyeing and proofing, corresponding post-finishing must be carried out according to the process to determine whether the selected dye will be used in the auxiliaries during post-finishing. Discoloration occurs under the action of the agent. Of course, it is ideal to choose a finishing agent that will not cause discoloration, but this often has limitations (for example, copper-containing antibacterial agents themselves have colors, and chromium-containing waterproofing agents also have colors, which will (causing discoloration of the fabric), factors such as light color and discoloration caused by dye sublimation during drying and baking of dyed fabrics, and yellowing caused by excessive temperature should also be taken into consideration.
③APEO exceeds the standard:
APEO is an indicator that is also strictly restricted by some countries. This indicator is related to scouring agents and penetrants in pre-treatment, cleaning agents and leveling agents in printing and dyeing, and emulsifiers in softeners during finishing. As TX and NP series surfactants are still widely used as auxiliary raw materials, it is difficult to prevent them. The only way is for printing and dyeing factories to insist on using environmentally friendly auxiliaries and strictly prevent auxiliaries containing APEO and toxic and harmful substances from entering the factory. use. KhRRS18rL
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