Water soluble polyester slurry for sizing DTY polyester low elastic filaments and preparation method thereof

Abstract

The invention discloses a water soluble polyester slurry for sizing DTY polyester low elastic filaments and a preparation method thereof, and belongs to the technical field of water soluble polyester slurry. The invention aims to solve the problems that the solid contents of acrylic acid slurry can only reach 30% or so, and the bonding force between the acrylic acid slurry and hydrophobic polyester fibers is weak. The water soluble polyester slurry is characterized by being composed of recycled polyester, glycol accounting for 5 to 10 wt% of polyester, m-phthalic acid-5-sulfonate or derivatives thereof accounting for 10 to 20 wt% of polyester, m-phthalic acid accounting for 3 to 15 wt% of polyester, other dibasic alcohols accounting for 5 to 10 wt% of polyester, a catalyst accounting for 0.03 to 0.15 wt% of polyester, and polyoxyethylene and/or polytetrahydrofuran accounting for 0 to 5 wt% of polyester. The slurry is prepared through steps of alcoholysis, copolymerization, cooling, and grinding. The slurry has a high glass-transition temperature, excellent chemical stability, anti-hydrolysis performance, and thermal stability, thus is convenient for transportation and storage, also has strong flexibility and a large breaking elongation rate, and is mainly used to size polyester low elastic filaments (DTY).

Description

technical field [0001] The invention belongs to the technical field of water-soluble polyester size, and in particular relates to a water-soluble environment-friendly polyester size used for sizing DTY polyester low elastic yarn and a preparation method thereof. Background technique [0002] The technology of water-jet loom weaving has brought better economy. As a high-speed shuttleless loom, it has shown great vitality in the contemporary textile industry. At the same time, it also gave birth to the development of water-jet loom size. Water-jet loom size is different from conventional size. When slurrying, the slurry should be easy to remove. [0003] The currently commonly used slurry for water jet looms is acrylic slurry. This type of slurry is solution polymerization of acrylic acid and its esters under the action of an initiator, and then saponification of the carboxyl group in the copolyester to make the slurry water-soluble. When thickened with ammonia water, the vo...

AI Technical Summary

Problems solved by technology

[0004] Acrylic slurry has the following disadvantages in production, storage and post-processing: 1. A large amount of ammonia that has a great impact on the environment and human body is used in production; 2. The solid content of the product is only about 30%, and there is a deadline for storage , high transportation costs; 3. Desizing waste liquid is difficult to biodegrade; 4. Acrylates have little adhesion to hydrophobic polyester fibers

[0005] Chinese patent CN103205832A proposes a sizing process of dope dyed polyester low elastic yarn, on the basis of adjusting the process parameters of the original sizing process, that is, warping, sizing, and shafting, and adding a waxing process to solve the problem Solved the problems of low production efficiency and poor quality of fine denier dope dyed polyester low-elasticity fabrics

[0006] The acrylic size in the prior art has obvious disadvantages as mentioned above. In addition, the water-soluble polyester for the size still has the following problems: (1) The product still has a little moisture absorption and stickiness, which affects water jet weaving, and in severe cases will cause the product to stick. And; (2) In order to prevent moisture absorption and re-adhesion, it is necessary to reduce the content of hydrophilic groups, which may affect the water solubility of the product. In severe cases, it may lead to incomplete desizing and affect the quality of the fabric