Synthesis And Application Of Formaldehyde-free Cross-linking Agent

Considering the current demand of the textile dyeing and finishing on thecross-linking agent, two new formaldehyde-free cross-linking agent with multi-functional were prepared in this research, which could react with cellulose fiber. Onewas bi-reactive group cross-linking agent P(DMDAAC-AGE) which had good fixingperformance in reactive dyed cotton fabrics, and it could be used as a formaldehyde-free,efficient and low-cost cross-linking agent in fixing process of cotton. Anotherpolyurethane formaldehyde-free cross-linking agent PCL-2was synthesized which wasused to improve the durability of the functional finishing. The PCL-2had goodfilm-forming, and the abrasion resistance, wrinkle resistance, water resistance of thefilm was good. When it was used to improve the durability of anti-UV and otherfinishing, the effect was good. Explore the synthesis process, and their structure andproperties were characterized. The following was main conclusions of this paper:1. Using dimethyl diallyl ammonium chloride(DMDAAC) and allyl glycidylether(AGE) as raw material, double-reactive cross-linking agent P(DMDAAC-AGE)was synthesized. The optimum synthesis conditions were defined as follows：the moleratio of AGE to DMDAAC1：2, initial concentration of the monomers30%in waterphase, initiator0.75%(to the mass of monomers), continuous dropwise addition of theinitiator and AGE, reaction at80℃for6hours.2. The process conditions are: cross-linking agent P(DMDAAC-AGE)30g/L, bathratio1:30, double dip and double nip(liquor retention70%), pre-drying at45℃for3min, curing at130℃for3min. After finishing, the fixing performance of the reactivedyed cotton fabric was good. Results showed that the reactive dyed cotton fabric wastreated by P(DMDAAC-AGE) had fairly good color fastness with4-level to wetrubbing,4～5-level to dry rubbing and4-level to soaping.3. Using isophorone diisocyanate(IPDI) and polyether binary alcohol(PPG), dimethylol butanoic acid(DMBA) and trimethylol propane(TMP) as main raw material,waterborne polyurethane cross-linking agent PCL-2was synthesized by self-emulsion.The-NCO/-OH ratio、DMBA and TMP on the stability and viscosity of emulsion,film’s water absorption and mechanical properties. PCL-2emulsion has goodperformance and storage stability. Cotton fabrics were finished by an inorganicultraviolet screening agent and then by PCL-2. The UPF value kept67.38after50washing times.4. The configuration and properties of the cross-linking agent were characterizedby FTIR、TG-DTA、SEM、Zeta electric potential and particle size analysis.