| Transfer printing technology with disperse dye, a water-free printing process，owns a lot ofadvantages including simple process, low investment in equipment, high artistic quality, finepatterns, without washing and further drying, etc. However, this technique is only suitable forsynthetic fiber, so it has a realistic significance when applied to cotton fabric and implementclean production. There are some problems in currently transfer printing process, such as lowcolor yield, poor color fastness, hard handle, bad hydrophilic and existing free formaldehyde,which seriously hindered the popularization and promotion of the process. Therefore, the paperexplored an environment-friendly modifier for transfer printing with disperse dye on cottonfabric through optimizing polymer monomer and cross-linking system, as well as analyzing theeffects of emulsifier composition and dosage and polymerization process on the latex properties.The structure and properties of modifier was characterized by a variety of means of moderninstrument analysis, such as FT-IR, DSC, TG, TEM and particle size analysis. Meanwhile itsapplication process was also studied. The research content of paper was divided into three partsas follows.Part one: The optimization of polymer monomers and cross linking systems of modifier.The relationship between copolymer composition and color yield of printing products wereexplored by specific development for copolymer with butyl acrylate as the main polymermonomer and styrene and acrylonitrile as modified monomer. The best crosslinking monomerwith significant influence on color fastness can be obtained by analyzing the effects of thedifferent crosslinking monomers on film mechanical properties，K/S value and the color fastnessof printing products. Then the effect of amount of crosslinking monomer on color fastness, filmmechanical properties and water resistances were studied. The results showed that the styrene(St) and acrylonitrile (AN) had significant impact on the K/S value of printing products. Thesatisfactory color depth and brilliance of printing products can be obtained when the amount ofstyrene and acrylonitrile were30%and5%, respectively. The crosslinking monomer of polyethylene glycol (200) dimethyl acrylate (PEG (200) DMA) can be used as an idealnon-formaldehyde crosslinker at the emulsion polymerization of transfer printing modifier. Andthe more dosage of crosslinking monomer is, the lower dissolve-loss rate of film will be. Whenthe crosslinking monomer was3%, the latex film presented lower water absorption, superiorbreaking tenacity and elongation, and the printing products had excellent color fastness.Part two: Synthesis and characterization of modifier.In this part, the polymerization of compound emulsifier was confected by non-APEOanionic emulsifier A-6820, nonionic emulsifier A-980and polymerizable emulsifier V-10S,which were used to synthesis modifier for transfer printing with disperse dye on cotton fabricby semi-continuous pre-emulsifying emulsion polymerization. The influences of compoundemulsifier ratio and its dosage on pre-emulsion stability，polymerization stability, latex stability,latex particle size and distribution were studied. The effects of polymerization temperature,holding-temperature time, initiator dosage on the properties of emulsion were discussed.Moreover, the FT-IR, DSC, TG, TEM and particle size analysis were used to characterize thestructure and properties of modifier, which showed that the emulsion polymerization gainedgood pre-emulsion, polymerization and latex stability, as well as good color fastness when thecompound emulsifier was confected by anionic and nonionic emulsifier at the ratio of2:1, atamount of6%, and the amount of polymerizable emulsifier V-10S was1%. The optimalpolymerization process for modifier is that polymerization temperature was80℃,with50minholding-temperature time and0.6%initiator dosage. In this process, the emulsionpolymerization exhibited better polymerization stability, higher monomer conversion and lowerpolymerization coagulation rate. TEM photos demonstrated that latex particles had regularspherical shape and uniform particle size. The Dynamic Light Scattering Particle Size Analyzermeasured that its diameter was65to70nm and the distribution was narrow. FT-IRcharacterization of modifier groups showed that individual monomer well carried outpolymerization. DSC analysis showed that the glass transition temperature of modifier was19.01℃. TGA curves indicated that thermal decomposition temperature of modifier was439℃.Part three: Study on the application process of modifier.The optimal foaming agents for self-made modifier on cotton fabrics were optimized by analyzing the foaming capacity and stability of different foaming agents. Primary factorsinfluencing foaming performance including the concentration of foaming agents and stabilizer,and the agitation speed, were analyzed. The effects of the modifier dosage, pre-dryingtemperature and time, baking temperature and time，transfer printing temperature and time onthe performance of printing products were investigated. The experimental results showed thatthe best foaming process was gained when the sodium dodecyl sulfate as a foaming agent was5g/L, the dodecanol as a stabilizer, was2g/L and the stirring speed was2000r/min. The bestapplied process of foam was that the modifier was60%, the pre-drying temperature and timewere80℃and100s, respectively, the baking temperature and time was150℃and80s,respectively. The best transfer printing process was that the transfer temperature and time were220℃and20s, respectively.Modifier was prepared using the best synthesis process and cotton fabric was modified bythe modifier. Then the modified fabric was transfer printed with disperse red dye. The testingresults indicated that the water, perspiration, dry and wet rubbing fastness and formaldehydecontent of printing products conform to the A grade of GB18401-2003《National general safetytechnical code for textile products》. Therefore, the modifier can be taken as anenvironment-friendly agent on transfer printing with disperse dye and achieve the purpose ofprinting and dyeing on cotton fabric with less or no water well. |
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