Synthesis And Application Of Low-temperature Cross-linking Binder

A lot of crosslinking adhesives are used in the textile dyeing and finishing,manyof them need high temperature baking, although they can achieve a good cross-linkingresult, high crosslinking temperature not only consume much energy, it can also leadto poor feel. Aiming at these problems, two kinds of low temperature cross-linkingbinder are studied, and they are used in coating finishing of dacron and pigmentprinted of cotton fabric, content and results of study are as follows:1、Low-temperature cross-linking of aqueous polyacrylate binder was producedusing acrylate-monomers(butyl-acrylat(BA) as soft monomer and methyl-methacrylate(MMA) as hard monomer),acrylic acid(AA), diacetone acrylamide(DAAM) etc.,neutralized with ammonia, and added adipic acid dihydrazide(ADH)as cross-linkerfinally. The optimum conditions of synthetic process was determined by single factoranalysis test:mass ratio of BA to MMA1:2,dosages of emulsifier5%, dosages ofinitiator0.6%,acrylic acid3%, dosages of diacetone acrylamide6%(all of on the massof total monomers), molar ratio of DAAM toADH was1:1.2、The synthesized low-temperature cross-linking of polyacrylate binder used incoating finishing, dacron has fine color fastness with3~4-level to wet rubbing,4-level to dry rubbing,4~5-level to soaping,and3.25kPa to hydrostatic pressure and1105.38g/(m2·24h)-1to moisture content when dosage of binder about20%, bakingtemperature and time is130℃and3min respectively.3、A blocked polyurethane was synthesized by polyurethane(PU)-prepolymerpreparing polypropylene glycol(PPG)、 dimethylolpropionic acid(DMPA) andisophorone diisocyanate(IPDI), methyl ethyl ketoxime(MEKO) as blocking agent. The optimum conditions of synthetic process were confirmed by single factor analysis test:R value (molar ratio of NCO to OH) is2.4, dosages of DMPA5%, blockingtemperature is40℃, and blocking time is90min.4、When dosages of binder is about30～35%, baking temperature was125℃and baking time was2.5min, pigment printed fabric had good color-fastnesswith4-level to dry rubbing,3~4-level to wet rubbing,3~4-level to soaping fastness, andbetter handle,color yield (K/S value)was9.22, lightness of color(L*) was35.40afterusing the blocked polyurethane. Compared with low temperature cross-linking bindersold by market, the former in rubbing and soaping fastness has improved half-level,K/S value and L*are not much diffreence while the index of fabric text style includingcompression, bend, surface rubbing have better to binder sold.5、The configuration and properties of two synthesized low temperaturecross-linking binder were characterized by FT-IR, particle size analysis and Zetaelectric potential, TG-DTA etc.