A kind of preparation method of pbat fiber

Abstract

The invention relates to a preparation method of PBAT fiber. When the PBAT fiber is spun, the processes of cooling, bundling, oiling, drafting and winding are carried out in sequence. The cooling adopts a combination of slow cooling and strong cooling. The cooling section includes a slow cooling section. and strong cooling section; the slow cooling section refers to that when the wire strands are cooled to 110-130°C, the strands are cooled to 50-70°C under a cooling tunnel of 10-15 meters; After the slow cooling section is over, the strands are cooled to room temperature, and the cooling air temperature is 5-10°C. The invention optimizes the cooling process of PBAT spinning, that is, when the filaments are cooled to near the crystallization temperature, the method of slow cooling is adopted, and the temperature is set near the crystallization temperature of PBAT for heat preservation, and sufficient crystallization time is given to the PBAT to make the PBAT crystallize. Perfect, improve the crystallinity of PBAT, the improvement of crystallinity can avoid the phenomenon of thread sticking in the process of bundling and winding of PBAT fiber, and improve the quality of PBAT fiber.

Description

technical field [0001] The invention belongs to the technical field of polymer fiber preparation, and relates to a PBAT fiber and a preparation method. Background technique [0002] As a new biodegradable copolyester, poly(butylene adipate-terephthalate) (PBAT) is mainly composed of 1,4-butanediol (BDO), hexane It is prepared from diacid (AA) and terephthalic acid (PTA) as raw materials. PBAT not only has the good thermal stability and mechanical properties of PBT, but also has the good stretchability and ductility of aliphatic polyester, and can also be degraded into water and carbon dioxide under natural conditions. PBAT can be used in fields such as packaging, medical and agricultural films. [0003] As a biodegradable plastic with excellent performance, PBAT can also be used in the field of textile and clothing. However, during the spinning process of PBAT, due to the low crystallinity of primary fibers, low glass transition temperature and slow crystallization speed,...

AI Technical Summary

Problems solved by technology

The patent "A PBAT material with fast crystallization speed and its preparation method" (201810122762.7) provides a PBAT material with fast crystallization speed and its preparation method, which is obtained by adding a nucleating agent dimethylene phenyl dialkyl However, this method does not change the crystallization properties of the polymer itself, does not help to improve the crystallinity of the polymer, and still cannot solve the problem of fiber adhesion during processing and use.

In addition to adding nucleating agents, researchers have also improved the spinning performance of PBAT by adding high polymers such as PLA and PHBV to PBAT for blend spinning. However, like adding nucleating agents, it has no effect on improving the crystallinity of polymers. Significant help, but also facing compatibility issues

The second is the spinning forming process. During the fiber forming process, the fiber crystallization obtained by polymers in different temperature, tension and other external environments is also very different, and the crystallization required by different polymer types and compositions The environment is also different, so it is necessary to rationally design the cooling and forming process according to the crystallization characteristics of the polymer. The patent "A PBAT Fiber and Its Preparation Method" (201210349313.9) designed a long cooling process during the spinning process, which strengthened the fiber. Cooling effect, but only by increasing the length of the cooling section can not meet the requirements of high-speed spinning, the spinning speed involved in the patent is 500-1200m / min