| In the molecule structure of polyamide fiber，there are many hydrophilic amide groups, butthe crystallinity of fiber was relatively high and the amorphous area of fiber was relativelysmall, therefore the hydrophilicity of polyamide fiber was poor. Therefore, it is necessary tomodify the fiber with hydrophilic method. Hydrophilic modification for polyamide fiber in thefinishing process has been demonstrated as a feasible and effective way. At present, mosthydrophilic modification adopt several hydrophilic compounds mixed or water-solublepolyether modified polysiloxane to finish polyamide fiber. However, there are some defectslike poor washing resistance of hydrophilicity and harsh handle after finishing of polyamidefabrics with the finishing agents.In view of this，a kind of polyamide-polyether block copolymer hydrophilic finishingagent (AG) for polyamide fabrics was synthesized by polycondensation reaction with adipicacid, hexamethylene diamine and carboxylic-terminated polyethylene glyco（lCT-PEG）whichwas prepared by mono esterification with polyethylene glycol and succinic anhydride as rawmaterials. On this basis, polyamide-polyether-organic silicon block copolymermulti-functional hydrophilic finishing AGS for polyamide fabrics was synthesized bycopolymerization modification of polyamide-polyether block copolymer hydrophilic finishingagent with functional monomer of amine-terminated polyether modified polysiloxanedi-APEMS）. Furthermore, it hopes to improve the hydrophilicity of AGS by introducingpolyethylene glycol segments into the molecule of AGS, to improve the washing durability ofhydrophilicity of AGS by introducing polyamide segments into the molecule of AGS, and toimprove the handle of finished fabric by introducing polysiloxane segments into the moleculeof AGS, then to solve the deficiencies which being brought by traditional finishing agent.Specific research content and its results of this thesis are as follows:Part one: Preparation of carboxylic-terminated polyethylene glycol by mono esterificationand its characterization. In this part, Carboxylic-terminated polyethylene glycol（CT-PEG）was prepared by monoesterification with polyethylene glycol（PEG，Mn=1500）and succinic anhydride （SA）asmonomers in toluene solvent. The effects of factors of mono esterification on the reactionconversion were studied, and the esterification conditions were optimized. The structure ofcarboxylic-terminated polyethylene glycol was characterized with FTIR and1H-NMR, and itsthermal property was tested by TG. The results indicated that the optimum esterificationreaction conditions were that the mole ratio of succinic anhydride and polyethylene glycol was2.5:1, the reaction temperature was110℃, reaction time was70min, the toluene was used asthe system solvent and not any catalyst need to be used. the molecular structure ofcarboxylic-terminated polyethylene glycol was determined by Fourier transform infrared（FTIR）and proton-nuclear magnetic resonance（1H-NMR）, and polyethylene glycol aftermodified possesses better thermal stability.Part two: Studies on the preparation of multi-functional hydrophilic and soft finishingagent AGS，its characterization and propertiesIn this part, Polyamide-polyether block copolymer hydrophilic finishing AG forpolyamide fabrics was synthesized by polycondensation at melt phase with hexamethylenediamine(HAD), adipic acid（AA）and carboxylic-terminated polyethylene glycol（CT-PEG）as raw materials. The influences of several key factors of polycondensation on hydrophilicityof AG were studied and then synthesis conditions of AG were optimized. On the optimumsynthesis conditions, AG was modified by amine-terminated polyether modifiedpolysiloxane(di-APEMS) to prepare polyamide-polyether-organic silicon block copolymermulti-functional hydrophilic and soft finishing AGS. The influence of amount of di-APEMSon solubility in water，softness, hydrophilicity and its durable-washing of AGS were studiedand then synthesis conditions of AGS were optimized. Molecular structure of AGS wasanalyzed by infra-red spectrometer （FTIR）, molecular weight and its distribution,crystallization degree and thermal characteristic of AGS were determined respectively by gelchromatography instrument（GPC）, X-Ray diffraction (XRD) and gravitational thermalanalysis instrument(TG). The results indicate that optimum synthesis conditions of AG are asfollows: mole ratio of adipic acid, hexamethylene diamine and carboxylic-terminatedpolyethylene glycol is1:3:1, the polycondensation temperature is240℃, the polycondensation time is2.5h and vacuum degree of condensation reaction is0.04MPa. when mole ratio ofdi-APEMS and CT-PEG was0.2:1，the averaged molecular weights(Mn) of AGS was27124,the thermal property of AGS was good, AGS was non-crystalline with good water-solubility,shows surface active nature, with78℃of cloud points and20.60mN/cm of surface tension,and0.9g/L of critical micelle concentration(CMC)..Part three: Research on application technology of multifunctional hydrophilic and softfinishing agent AGS and its properties.In this part, the influences of these factors such as dosage of AGS, curing temperature andcuring time on hydrophilicity of AGS were studied, the pad finishing process conditions ofmultifunctional hydrophilic AGS was optimized. Hydrophilicity，its washability，antistaticproperty and handle of AGS were measured. Compared with polyether modified polysiloxaneand the foreign same kind hydrophilic finishing agent, the fitnesses for polyamide fabric ofAGS were evaluated. The results indicate that optimal pad finishing process of AGS are asfollows: dosage of AGS is2.5g/L, baking temperature is170℃and baking time is30s.Compared with the other finishing agent, AGS not only has good hydrophilicity and antistaticproperty，but also favorable handle with durable-washing properties.The results of this thesis showed that polyamide-polyether-organosilicon block copolymermultifunctional hydrophilic finishing agent AGS was synthesized by copolymerization withamine-terminated hydrosilation（di-APEMS）and hexamethylene diamine(HAD), adipic acid（AA）and carboxylic-terminated polyethylene glyco（lCT-PEG）which was prepared by monoesterification with polyethylene glycol and succinic anhydride as raw materials. The AGS havegood hydrophilicity, handle, antistatic property and durable-washing properties. Thus, thefinishing agent AGS can solve the problem of poor washing resistance and harsh handle in acertain extent, which is a kind of multifunctional hydrophilic finishing agent for polyamidefabrics. |
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