Thermoplastic polyester elastomer composition and application thereof

Abstract

The invention discloses a thermoplastic polyester elastomer composition. The thermoplastic polyester elastomer composition consists of a polyester rigid segment section, a soft segment section derived by polycaprolactone dibasic alcohol, 0.1-1.5wt% of nucleating agent and 0.1-2wt% of antioxidant, wherein the rigid segment section consists of repetitive units derived by at least one alkylene glycol and at least one aromatic dicarboxylic acid; the weight ratio of the rigid segment section to the soft segment section is 60:(40-90):10; the nucleating agent is talcum powder with the particle size of 0.01-20 microns. The invention also discloses a secondary spring of the thermoplastic polyester elastomer composition used for manufacturing transport cars. According to the secondary spring, strict requirements of high dynamic load, low compression set, durability and comfort level on the transport cars are met, and the processing cost of the secondary spring is effectively reduced. The thermoplastic polyester elastomer composition is mainly used as a high-strength damping element for bearing dynamic fatigue, such as buffering and damping elements and bridge damping blocks in transportation means such as cars.

Description

technical field [0001] The present invention relates to a thermoplastic polyester elastomer composition; moreover, the present invention also relates to the use of the thermoplastic polyester elastomer composition in the manufacture of auxiliary springs for transport vehicles. Background technique [0002] Thermoplastic polyester elastomer, also known as polyester rubber, is a type of linear block copolymer containing a hard segment of polyalkylene phthalate and a soft segment of aliphatic polyester or polyether. Thermoplastic polyester elastomer combines the excellent elasticity of rubber and the ease of processing of thermoplastics, and has high structural strength, good creep resistance, excellent resilience, impact resistance and bending fatigue resistance, wear resistance, and stable dimensions. It is flexible at the same time and can maintain good performance at high temperature. Therefore, the products prepared by thermoplastic polyester elastomers can be used as hig...

AI Technical Summary

Problems solved by technology

However, with the trademark This polyester elastomer is sold as a three-component product, namely (1) dimethyl terephthalate; (2) polyethylene glycol, such as polytetramethylene ether glycol, polyethylene glycol, Ethyl ether glycol or polypropylene ether glycol; and (3) short-chain diols, such as butanediol and ethylene glycol, to prepare auxiliary springs as shown in the attached figure, and carry out vertical loading: 20kN~ 200kN, cycle frequency 1Hz, the requirement is that the product does not appear damaged, and the permanent deformation does not exceed 25%. The test result shows that severe cracking occurs when the cycle is less than 10,000 times, which cannot meet the requirements of the suspension and shock absorption system of commercial vehicles.

However, the auxiliary springs made by these two processing methods are damaged or have large permanent deformation when subjected to load fatigue tests.

In addition, it is also feasible to use ordinary injection molding methods for processing, but its production efficiency is very low. It takes 30 to 40 minutes to form each auxiliary spring. If the efficiency is improved, more machines and manpower must be invested, which also increases the processing cost.

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