Synthesis, Properties And Application On Fabrics Of Bola-type Modified Organosilicon

With the progress of science and technology,people's new requirements for clothing accelerate the development of fabric finishing softener.At present,silicone softener is the most widely used in the textile industry due to its good softness properties and wide raw material sources.However,many issues still exist in yellow degeneration,water resistance,hydrophilicity and so on.In addition,it does not have good comprehensive performance on fabric,which greatly limits its application in textiles.Therefore,the focus of this study is to balance the hydrophilicity and softness of the fabric by designing and synthesizing specific polysiloxane structures.In this paper,a series of epoxy-polyether epoxy silicone(EPEPS)with different molecular weights were prepared by hydrogen-addition reaction using hydrogen-terminated PHMS and allyl epoxy-polyether epoxy(APEE).A short-chain quaternary ammonium salt(MDEQA)was synthesized via MDEA and glacial acetic acid(HAc).MDEQA was grafted onto the polysiloxane chain segment by the reaction of epoxy ring-opening.The optimum production process conditions were determined through the study on the reaction time,reaction temperature,solvent content and material molar ratio.And the optimum conditions were set up as follows: the amount of catalyst was 0.2 %,the reaction temperature was 90 ?,the molar ratio of material [n(EPEPS): n(MDEQA)] was 1: 1.5,and the solvent content was 35 %.The structures of the raw materials,intermediates and target products were characterized by infrared spectroscopy.The results proved BQPEPS were successfully synthesized.The conversion rate of MDEQA reached 78 %,which was determined by High Performance Liquid Chromatography with external standard of peak area.Then the particle size and morphology of the BQPEPS emulsion were analyzed by DSC and TEM.It is investigated that the emulsion was uniformly dispersed,and the morphology of emulsion was round or oval shaped,surrounded by the emulsifier emulsion particles.At the same time,the stability of the emulsion was tested.The results confirmed that BQPEPS emulsion had good properties and could be used in practical production.In the adsorption process of BQPEPS on cotton fabric,the optimal adsorption process of BQPEPS on cotton fabric was determined as follows: the concentration of BQPEPS was 1200 ppm,the dosage of BQPEPS emulsion was 50 m L,the adsorption temperature was 50 ?,the dosage of cotton fabric was 1.0 g,and the adsorption time was 60 min.The optimal fabric finishing process in actual production could be scaled up accordingly.The effect of the cationic structure of BQPEPS on cotton fabric was explored.Compared with the intermediate product EPEPS,the BQPEPS had a better adsorption capacity on the cotton fabric.The kinetic model and isotherm model of BQPEPS adsorption on cotton fabric were also studied.The adsorption kinetics of BQPEPS on cotton fabric can be accurately characterized by pseudo-second-order kinetic equation.The isotherm model confirmed that the adsorption of BQPEPS on cotton fabric was an endothermic process.The adsorption isotherm can be described by the Langmuir-Freundlich adsorption model.The finishing process of BQPEPS was optimized and analyzed in order to improve the hydrophilicity and softness performance of cotton fabric.The optimal finishing process of BQPEPS was determined as follows: the quantity of softening agent was 1200 ppm,the soaking temperature and time was 50 ? and 1 h,the conditions of preliminary dry was 100? in 5 min,the curing temperature was 140 ?,and the drying time was 2 min.The hydrophilicity and softness of BQPEPS was better than the commercial soft finishing agent by the comparison tests of wetting time,softness,static contact angle,bending roughness and friction coefficient with the softening agent on sale.Meanwhile,the composition on the surface of BQPEPS-treated cotton fabric was characterized by XPS.The microstructure of BQPEPS-treated cotton fabric and original cotton fabric was observed by SEM and AFM.Based on this,the mechanism of its hydrophilicity and softness was preliminarily proposed.