Preparation of low-melting-point polyester fiber and application of low-melting-point polyester fiber in natural fiber bonding

Abstract

The invention relates to preparation of low-melting-point polyester fiber and application of the low-melting-point polyester fiber to natural fiber bonding, and the preparation method comprises the following steps: mixing low-melting-point polyester with conventional polyester, and then preparing the low-melting-point polyester fiber according to a skin-core composite spinning process, the low-melting-point polyester is obtained by preparing terephthalic acid, adipic acid, ethylene glycol, 2, 3-pentanediol, diethylene glycol, a catalyst, a stabilizer and a heat conduction material into slurry and then carrying out esterification reaction and condensation polymerization reaction; the addition amount of the adipic acid is 4.5-5.5 mol% of the terephthalic acid; the application comprises the following steps: mixing the low-melting-point polyester fiber, the natural fiber and the three-dimensional curly hollow polyester according to a certain proportion, carding to form a net, heating and drying, and shaping to prepare the low-melting-point fiber flocculus. The melting point of the prepared low-melting-point fiber is 95-110 DEG C, the glass transition temperature is 62-65 DEG C, the low-melting-point fiber can be widely applied to bonding of natural fibers, the adhesive force between the main body fiber and the low-melting-point fiber is high, and the bonding strength between fibers among flocculus is good.

Description

technical field [0001] The invention belongs to the field of non-woven technology, and relates to the preparation of low-melting polyester fiber and its application in natural fiber bonding. Background technique [0002] Low melting point polyester is a new type of modified polyester with a lower melting point. By adding a variety of modified components in the polymerization process of ordinary polyester, the molecular structure of PET is changed, and its crystallization performance is reduced at the same time, so as to reduce the for melting point purposes. Isophthalic acid (IPA) and diethylene glycol (DEG), two typical chemical structure modification components, are usually used to destroy the regularity of PET molecular chains and greatly reduce the perfection of crystallization, thereby obtaining low-melting point polyester. . It is generally believed that the addition of isophthalic acid (IPA) changes the ratio and size of different sub-macroscopic crystal forms of PE...

AI Technical Summary

Problems solved by technology

[0004] The materials that can be used in the non-woven field include almost all civilian fibers, but in practical applications, polyester fibers, polyester hollow fibers, low-melting point fibers and other materials are most widely used, and low-melting point fibers are used in natural fibers such as cotton fibers and wool. Often, the amount added is too much, 25-30%, and the compressive elastic modulus is also low. Through electron microscope analysis, it is found that the bonding effect of low-melting point fibers is not obvious

This is because natural fibers such as cotton fiber and wool contain more moisture, which is quite different from polyester. The moisture regain of polyester is only about 0.4%, while that of cotton fiber is about 6-9%. The moisture regain is about 9-11%. When the non-woven material is heated, the evaporation of water takes away a lot of heat, so that the low-melting point fiber cannot be completely melted, resulting in poor bonding effect of the low-melting point fiber. The amount of melting point fiber can meet the requirements of nonwovens application