Dry spinning process of making bright polyacrylic fibre

Abstract

A method for making dry-spun acrylic fiber with large gloss. By improving the original spinning and forming post-treatment process, in the process of washing and drawing, the washing temperature is increased to control at 96°C to 100°C, and the draw ratio control is reduced. At 2.65-4.5 times, reduce the drawing speed to 230-360m / min, and at the same time increase the drying temperature and steam flow in the process of water washing and drying after drawing, which not only ensures that the molecular chain has enough stretching time, but also avoids causing molecular damage. Chain damage, thereby reducing the roughness and damage of the fiber surface, and improving the smoothness and densification of the fiber, making the fiber shiny and bright, which meets the requirements of the domestic fur, clothing and other industries for fiber brightness. It can completely replace imported products.

Description

technical field [0001] The invention relates to a method for producing acrylic fiber by dry method, in particular to a method for producing bright fiber by dry method spinning acrylic fiber. Background technique [0002] Although our country introduced the production technology of American DuPont Company to produce acrylic fibers by dry method in the mid-1980s, the parameters in the production process are not perfect and reasonable enough, which makes the surface of the fibers severely torn during molding, resulting in smoothness of the fiber surface. , smoothness decline, so the brightness of the acrylic fiber produced by this method is poor, and it cannot meet the needs of industries such as producing underwear, clothing and making artificial fur and blankets with acrylic fiber as raw material. Domestic industries still need to rely on imported raw materials for production. [0003] Patent application No. 200410018616.8 "Production method of dry-process acrylic fiber conta...

AI Technical Summary

Problems solved by technology

[0002] Although our country introduced the production technology of American DuPont Company to produce acrylic fibers by dry method in the mid-1980s, the parameters in the production process are not perfect and reasonable enough, which makes the surface of the fibers severely torn during molding, resulting in smoothness of the fiber surface. , smoothness decreased, so the brightness of the acrylic fiber produced by this method is poor, and it cannot meet the needs of industries such as the production of underwear, clothing and artificial fur, blankets and other industries using acrylic fiber as raw material. Domestic industries still need to rely on imported raw materials for production

[0003] Patent application No. 200410018616.8 "Production method of dry-process acrylic fiber containing vinyl acetate" only studies the raw materials in DuPont's production technology, solves the problem of raw material shortage, finds better substitutes, and effectively reduces the production cost of acrylic fibers. It has improved the spinnability of the fiber and made a significant contribution to the improvement of the dyeing performance of the fiber, but it still has not solved the requirements for the brightness of the fiber, and it cannot meet the needs of various industries that use acrylic fiber as raw material.