Modified polyester chip for manufacturing high-elasticity polyester fiber and preparation method thereof

Abstract

The present invention relates to a kind of modified polyester chip for making high elastic polyester fiber, which is characterized in that it is directly esterified into an esterified product after adding methyl propylene glycol in the slurry prepared by dibasic acid, dibasic alcohol and additives , the esterified product is then subjected to liquid phase polycondensation in a prepolymerization tank and a final polymerization tank, and after liquid phase polycondensation, it is cooled and sliced ​​to obtain modified polyester chips with an intrinsic viscosity of 0.5-1.2dl / g for the production of high-elastic polyester fibers Finished product, wherein the molar ratio of methylpropanediol to diol is 1:4~1:99. The present invention also designs the preparation method of the modified polyester chip for producing high elastic polyester fiber. The invention has the advantage that the short and long polyester filaments produced by melt spinning have good dyeability, spinnability and elasticity.

Description

technical field [0001] The invention relates to a modified polyester chip, in particular to a modified polyester chip used for manufacturing high-elastic polyester fiber and a preparation method thereof. Background technique [0002] Polyester is a general term for polymers obtained by polycondensation of polyols and polybasic acids; generally, dibasic acids, dibasic alcohols and additives are adjusted into slurry to make finished polyester through direct esterification. The finished polyester mainly refers to poly Ethylene phthalate (PET) also customarily includes linear thermoplastic resins such as polybutylene terephthalate (PBT) and polytrimethylene terephthalate (PTT). It is one of the earliest materials used as textile raw materials, and it is also the largest variety of synthetic fibers. The biggest advantage is that it has good wrinkle resistance and shape retention, and has high strength. It is strong and durable, anti-wrinkle and non-ironing, and non-sticky. Pol...

AI Technical Summary

Problems solved by technology

This method will introduce a large number of ether bonds into the main chain of the polyester molecular chain, resulting in a decrease in the thermal stability of the fiber product, reducing the spinnability of the material, and increasing the broken filament rate during the spinning process.

There are also monomers that add dye-friendly groups such as sulfonate, sodium 3,5 dimethyl benzene sulfonate and aliphatic dibasic acid ethylene glycol polyester with 6 to 10 carbon atoms for block copolymerization. This method requires the use of a transesterification polymerization process, which is complex and has a highly toxic by-product of methanol

Physical methods include making various special-shaped polyesters, composite spinning with other polymers, colored polyesters, fine denier polyesters and high-shrinkage polyesters, etc. The process is complex and costly

Or use high-temperature, high-pressure dyeing methods, which have high requirements for equipment, high energy consumption, and the disadvantages of difficulty in continuous production, and the light fastness of dyed fibers or fabrics is poor, making the use value of the final product reduce

[0004] To sum up, although there are some technologies that can improve the dyeability, spinnability and elasticity of polyester fibers, these methods still have certain shortcomings, and they cannot meet the high performance requirements in terms of indicators.