Thermoplastic polyester elastomer composition and method for preparing auxiliary spring

Abstract

The invention discloses a thermoplastic polyester elastomer composition. The thermoplastic polyester elastomer composition comprises a polyester-polyester block copolymer and an auxiliary agent. The polyester-polyester block copolymer comprises a hard chain segment and a soft chain segment. The hard chain segment comprises repeating units derived from at least one alkylene glycol and at least onearomatic dicarboxylic acid. The soft chain segment is derived from polycaprolactone diol. The invention discloses a method for preparing an auxiliary spring for a transporting vehicle from the polyester elastomer composition. Through improvement of the composition of the thermoplastic polyester elastomer, the physical properties of the thermoplastic polyester elastomer in high and low temperatureenvironments are improved. The auxiliary spring prepared from the thermoplastic polyester elastomer can well meet the harsh requirements on high dynamic load, low compression permanent deformation, durability and comfort of a transporting vehicle.

Description

technical field [0001] The invention relates to the field of materials, in particular to a thermoplastic polyester elastomer composition and a manufacturing method for using the thermoplastic polyester elastomer composition in an auxiliary spring for transporting automobiles. 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 has both the excellent elasticity of rubber and the ease of processing of thermoplastics, and it 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, products prepared from thermoplastic polyester elastomers can be used as hig...

AI Technical Summary

Problems solved by technology

However, using the trademark The auxiliary spring made of this polyester elastomer sold (cross-sectional shape such as figure 1 As shown, the ingredients mainly include three types: dimethyl terephthalate, polyethylene glycol (such as polytetramethylene ether glycol, polyethylene ether glycol or polypropylene ether glycol) etc.), short-chain diols (such as butanediol, ethylene glycol)), in the vertical loading test (test conditions: 20kN ~ 200kN, cycle frequency 1Hz; the requirement is that the product does not appear damaged, and the permanent deformation does not exceed 25 %), severe cracking will occur if 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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