Polyester chip for producing automotive interior fiber and preparation method thereof

Abstract

The invention discloses a polyester chip for producing automobile interior decoration fibers and a preparation method thereof. Firstly, the polyester chip that meets the technical requirements is synthesized: using a two-pot process semi-continuous polymerization reaction device, by introducing isocyanate in the esterification reaction Construct and replace carboxylic acid to reduce the melting point of the product to the target range, and then add reactive catalyst, stabilizer, auxiliary materials, etc. in the polycondensation reaction to control the reaction temperature and vacuum degree, and the final synthetic intrinsic viscosity is 0.730‑0.740dl / g The target polyester chip base material; the synthesized product is passed through the solid phase drum device water steam crystallization process to complete the pre-crystallization of the polyester chip; the pre-crystallized polyester chip is obtained by temperature control without cooling down. The continuous negative pressure processing technology completes the drying of polyester chips. After drying, the water content of polyester chips is not higher than 0.05%, and the intrinsic viscosity is not lower than 0.715dl / g. Through the above three steps, the special polyester chips for automotive interior fibers that meet the requirements of industrial production can be prepared.

Description

technical field [0001] The invention relates to a polyester chip and a preparation method thereof, in particular to a polyester chip used for producing automobile interior fiber and a preparation method thereof. Background technique [0002] As an important raw material for textiles, polyester fiber has been used in the production of automotive interiors for a long time, especially in the automotive industry that first started abroad, and has already formed a relatively mature set of standards for the supply of raw materials for automotive interiors. Because polyester fiber has good abrasion resistance, high tear strength, mildew resistance, excellent UV resistance, easy cleaning, good resilience and wrinkle resistance, and the price is relatively cheap, accounting for the largest share of automotive textile decorative fabrics. More than 90% of the market. With the continuous development of the domestic automobile industry in recent years, major automobile manufacturers hav...

AI Technical Summary

Problems solved by technology

[0004] 1. Polyester chips for ordinary fibers have a high melting point, high energy consumption ratio for heating and bonding, and polyester fibers are prone to deformation at high temperatures. For forming fabrics, the setting result is uncontrollable;

[0005] 2. Polyester chips for ordinary fibers are not modified, and the chain segments are too regular. After heating and bonding, the strength is generally not high and the flexibility is insufficient. In subsequent use, delamination, disconnection and deformation will occur due to poor reliability. A series of problems, such as durability and anti-aging performance, are not suitable for long-term use;

[0006] 3. Polyester chips for ordinary fibers generally have low viscosity due to polymerization control, wide molecular weight distribution range, low crystallinity and cleanliness, which are very unfavorable for the production of filaments in subsequent composite spinning, which limits the extension of its use