Thermoplastic polyurethane elastomer and manufacturing method thereof

Abstract

The invention relates to the manufacturing field of a special extrusion grade T-die thermoplastic elastomer, in particular to a manufacturing formula and a manufacturing method thereof. The formula comprises the following components: 20-40% of 4,4'-diphenylmethane-diisocyanate, 15-70% of polybutylene adipate the molecular weight of which is 1000 or 2000, 0-50% of poly butylene glycol adipate the molecular weight of which is 2000, 5-15% of 1,4-butanediol, 0-5% of glycol, 0.1-1.0% of antioxidant, 0.1-1.0% of lubricant, 0.001-0.1% of environment-friendly catalyst, 0.1-1.0% of ultraviolet absorbent, 0.1-1.0% of light stabilizer and 0.1-1.0% of hydrolysis resistant agent. Continuous production processes are used for synthesizing TPU (thermoplastic polyurethane). The product of the invention has the advantages of stable quality, excellent performance, few T-die extrusion crystal points, good transparency (more than 4mm), stable extrusion, no occurrence of separation of additives, high hydrolysis resistance and high UV (ultraviolet) resistance, and the indexes and the performance of the product can reach the indexes of international like products. The invention provides a thermoplastic polyurethane elastomer and a manufacturing method thereof.

Description

[technical field] [0001] The invention relates to the field of manufacturing a special extrusion-grade T-die thermoplastic elastomer, in particular to its manufacturing formula and manufacturing method. [Background technique] [0002] Thermoplastic polyurethane elastomer, also known as polyurethane thermoplastic elastomer (ThermoplasticPolyurethane Elastomer, referred to as TPU), is one of the three types of polyurethane elastomer. Compared with polyurethane elastomer (CPU) and mixing polyurethane elastomer (MPU), thermoplastic polyurethane elastomer has no or little chemical crosslinking in chemical structure, and its molecular chain is basically linear, but there is a certain amount of physical cross-link. [0003] TPU as a (AB) n Type block linear polymer, A is a polyester or polyether with a molecular weight of 1000-6000, which is called a long bond, B is a diol containing 2-12 straight chain carbon atoms, which is called a short bond, and the chemistry between AB segm...

AI Technical Summary

Problems solved by technology

[0013] Compared with foreign enterprises, the thermoplastic polyurethane elastomers produced by domestic enterprises are not ideal in terms of product quality stability, and the technical indicators in terms of wear resistance, resilience, tear resistance, bending, and tensile strength need to be improved. , especially for extrusion-grade products, the spit out is unstable, especially for the higher-level T-Die processing of the extrusion grade. There are many crystal points on the surface and inside, which makes T-die products easy to break, and some additives will precipitate out, resulting in poor transparency. , unable to meet the processing requirements of T-die and film products