| In present market, the polyester polyether hydrophilic finishing agent was synthesized with DMT,EG and PEG by polycondensation, it has regular structure, high crystallinity, and poor water solubility, and is easy to aggregate when being dispersed in water. The hydrophilic performance of the finishing agent was influenced by finishing agent's poor water solubility, and the finishing agent is not suited for hydrophilic finishing of polyester fabric in dyeing bath with disperse dyes, and don't meet the requirements of saving water and energy in dyeing industry. In view of this. A new type polyester polyether copolymer hydrophilic finishing agent wassynthesized with DMT, EG, SIPM(being used to replace section of DMT)and PEG as raw materials by means of two-step reaction including transesterification and polycondensation. The interoposition structure of SIPM could destroy the regularity of the copolymer's structure and decrease the crystallinity of the copolymer; meanwhile, the introduction of soluble groups–SO3Na of SIPM could further improve the water solubility of the copolymer. the hydrophilic and washing durability of the new polyester polyether copolymer hydrophilic finishing agent are not effected, the water solubility of the finishing agent can be improved greatly, and this hydrophilic finishing agent can be suited for using with disperse dyes in one bath to polyester fabric. Specific research and results are as follows.PartⅠ:A new type polyester polyether copolymer hydrophilic finishing agent was synthsized with Sodium-5-sulfoisophthalic acid dimethyl ester (SIPM) as modifying monomer, through two steps of ester change raction and polycondensation. The effect of PEG molecular,mol ratio of DMT and PEG and feeding order of PEG , dosage of SIPM, temperature and time of polycondensation, amount of catalyst and vacuum degree of condensation reaction on s hydrophilic properties and solubility in water of finishing agent were researched, the synthesis reaction conditions was optimized. The effect of temperature and time of polycondensation and amount of catalyst on acid value of the finishing agent were studied in order to investigate the relativity between acid value and hydrophilicity of finishing agent. The structure and properties of finishing agent was studied by FTIR, Thermal gravimetric analyzer and X-Ray diffraction. The application properties were compared with conventional polyester polyether hydrophilic finishing agent. The results indicate that when PEG molecular is 1500, mol ratio of DMT and PEG is 3:1, and PEG is added into reaction system in polycondensation stage, the molar ratio of SIPM to ester(total amount of SIPM and DMT) is 30%, polycondensation temperature is 260℃, polycondensation time is 45min and mass fraction of catalyst to ester is 0.20%, the water solubility, hydrophilicity and washing durability of finishing agent are good. Acid value of finishing agent is good relevant with the hydrophilicity. FTIR analysis indicates that finishing agent has polyester polyether structure; TG analysis indicates thermal stability of finishing agent is good; XRD analysis indicates that finishing agent is non crystal compound. the hydrophilicity and washing durability of finished fabric with the finishing agent are equivalent with conventional polyester polyether finishing agent, and the water solubility and cloud point of finishing agent is improved obviously, and in theory, it is suited for being used with disperse dyes in one bath to dye and finish polyester fabric.PartⅡ:Self-made new type polyester polyether copolymer hydrophilic finishing agent was applied in hydrophilic finishing of PET fabric by dipping method. The effect of these factors such as dosage of finishing agent, baking temperature and time on hydrophilicity of finished fabric were studied, and the finishing process condition was optimized. The hydrophilicity, washing durability, antistatic and softness of finished PET fabric were measured, the application properties of the hydrophilic finishing agent were compared with similar products in market. The mechanical properties of finished fabric were investigated. The results indicate that optimum dipping finishing process conditions are as follows: dosage of finishing agent is 4%(owf), baking temperature is 150℃and baking time is 70s. Finished fabrics have good hydrophilicity, antistatic property and washing durability, meanwhile, the softness of finished fabric is improved too. To some extent, the application properties are better than similar hydrophilic finishing agent products in market, and breaking strength of finished fabric was increased.PartⅢ:In order to shorten dyeing and finishing process, reduce energy consumption, increase production efficiency, and improve the hydrophilicity of PET fabric in dyeing, self-made new type polyester polyether copolymer hydrophilic finishing agent was used to hydrophilic finish polyester fabrics in dyeing bath with disperse dyes by high temperature pressure dyeing and low-temperature carrier dyeing method. The effect of different dosage of finishing agent on dyeing uptake, K/S value, color, hydrophilicity and chromatism of polyester dyed with disperse dyes were studied, the dosage of finishing agent was optimized. The effect of finishing agent on color fastness of polyester dyed with disperse dyes was investigated. The effect of finishing agent on dyeing rate curves and dye promotion of polyester fabric dyed with disperse dyes by high temperature pressure dyeing method were studied. The results show that dyeing uptake and K/S value of polyester fabric dyed with low-temperature type dyes were not affected by finishing agent, but to intermediate-temperature and high–temperature type disperse dyes, dyeing uptake and K/S value shows some decline with the increase of amount of finishing agent, and the dosages of finishing agent have bigger effects on high-temperature dyeing than intermediate-temperature dying. The chromatism and color fastness of polyester fabric with disperse dyes were not effected by finishing agent. To low-temperature and intermediate-temperature type dyes, when the dosages of finishing agent is 6% (owf), the hydrophilicity of polyester fabric dyed with hydrophilic finishing agent and disperse dyes in one bath is good, and compared with fabric dyed with only disperse dyes, the chromatism is small. But to high-temperature type dyes, when the dosages of finishing agent are 4% (owf), the hydrophilicity is good and chromatism is small. The dyeing rate of fabric dyed in one bath is slower than that of fabric dyed with disperse dyes, but dye promotion is not effected. |
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