| Pigment printing was regarded as one of clean production process by textile industrybecause of its many advantages, such as simple process, complete color chromatography,needless washing after fixation, energy saving, emission reduction. However, the polyacrylatelatex as binder for pigment printing which was used widely in our country generally existedmany defects, such as poor property of waterproof and stain resistance of latex film and hotsticky-cool brittle performance of the film, and there are contradiction between handle and colorfastness of printed fabric, which limited the popularity and development of pigment printing. Inview of the above, a double terminated acryloyl-polyether silicon oil was synthesized andapplied in the preparation of silicon-modified polyacrylate latex for pigment printing, in order toimprove the color fastness and the handle of printed fabric. There are3parts in this research.Part1: Synthesis and characterization of double terminated acryloyl-polyether silicon oilIn this part, a double terminated acryloyl-polyether silicon oil (DTAPS) was prepared byesterification reaction with acrylic acid and polyether silicon oil terminated by double hydroxylas raw materials. The influences of reaction factors such as amount of catalyst, reactiontemperature and time, dosage of solvent and inhibitor on the esterification rate were investigated,and the structure of product was characterized by FTIR and1H-NMR. The results showed thatthe optimal esterification condition was that the amounts of catalyst and solvent were5%and70%of total reactant mass respectively, the dosage of inhibitor were0.75%of the amounts ofacrylic acid, reaction temperature was110℃and reaction time was4h. FTIR and1H-NMRanalysis indicated that the structure of product was acryloyl-polyether silicon oil.Part2: Preparation and properties of silicon-modified polyacrylate latex for pigmentprintingOn the basis of previous experiments, fixed the mole ratio soft monomer and hardmonomer is2.5:1, the amounts of cross-linking monomers(NMA) is2%, the dosage of acrylic is3%, the effects of addition methods of DTAPS, emulsification system, molecular weight ofpolysiloxane in the DTAPS, the amounts of DTAPS on the properties of organic silicon modified polyacrylate latex, latex film and pigment printing were studied, the structure and propertieswere analyzed by SEM, FTIR, TEM, particle size analyzer, water contact angle analyzer, and thethermo-gravimetric analyzer. The results showed that the method of which DTAPS and acrylicmonomers polymerized after blinding, could effectively increase the stability of the emulsionpolymerization. When the mass ratio of anionic emulsifier to nonionic emulsifier was2:1and theamount of compound emulsifier was5%, the emulsion polymerization exhibited highermonomer conversion and lower polymerization coagulation rate, the latex had good stability. Thehigher molecular weight of polysiloxane was, the less content of organic silicon monomer whichgrafted to the polyacrylate molecular chain by copolymerization was, the larger particle whichwas formed by enrichment and agglomeration of the organic silicon was, the poorer properties ofpigment printing was. The amount of organic silicon monomer with1600molecular weight was6%-8%, the stability of emulsion polymerization was good, water resistance and mechanicalproperties were good, the dry and wet rubbing fastness of pigment printing fabric reached4grades, and the printed fabric’s handle became softer. FTIR analysis indicated that organicsilicon monomer had grafted to polyacrylate molecular chain, TEM and particle size analysisdisplayed latex particle showed a regular ball shape, the average diameter was85nm anddistribution was narrow, water contact angle analysis and TG analysis indicated thathydrophobicity and heat-resistant stability of the modified film improved obviously.Part3: Research on the application of organic silicone modified polyacrylate binder in thepigment printingIn this part, the influences of the amounts of organic silicone modified polyacrylate latexbinder, curing temperature and curing time on properties of pigment printing for cotton fabricwere studied, and the organic silicone modified polyacrylate binder was compared with otherpigment printing binder. It was found that when the binder was16%, curing temperature was160℃, curing time was4min, the printed fabric had good handle, and dry rubbing fastness and wetrubbing fastness can reach grade4. Compared with other pigment printing binder, the fabricprinted with silicone modified polyacrylate binder had better handle and color fastness.The research showed that after the silicone modified polyacrylate latex as binder forpigment printing which being synthesized with non-APEO emulsifier, double terminatedacryloyl-polyether silicon oil and acrylate monomers was applied in pigment printing, the printed fabric had better handle, and the dry and wet rubbing fastness of the printed fabric reached4grades, basically achieved the unification of handle and colorfastness. |
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