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A kind of preparation method of damping gasket

A shock-absorbing pad and chain segment technology, which is applied in the field of shock-absorbing gaskets, can solve the problems of insufficient overall mechanical properties of TPEE shock-absorbing gaskets, and achieve enhanced wear resistance, excellent overall mechanical properties, and expanded applications. range effect

Active Publication Date: 2022-05-10
JIANGSU HENGLI CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the overall mechanical properties of the TPEE damping pads in the prior art are not good enough, and to provide a preparation method for the damping pads

Method used

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  • A kind of preparation method of damping gasket
  • A kind of preparation method of damping gasket
  • A kind of preparation method of damping gasket

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of a shock absorbing gasket, the specific steps are as follows:

[0036] (1) Preparation of thermoplastic polyester elastomer;

[0037] (1.1) Esterification reaction;

[0038] Mix the terephthalic acid, 1,4-butanediol, polytetrahydrofuran, 2,5-pyridinedicarboxylic acid and ferrous chloride into the reaction kettle evenly, and carry out the esterification reaction under the pressure of 3000Pa. The temperature of the reaction is 250°C, and the termination condition of the esterification reaction is: the distilled amount of water in the esterification reaction reaches 95% of the theoretical value;

[0039] The molar ratio of terephthalic acid, 1,4-butanediol and 2,5-pyridinedicarboxylic acid is 1.0:1.80:0.08, the addition amount of polytetrahydrofuran is 44% of terephthalic acid weight, the number average molecular weight of polytetrahydrofuran It is 2000g / mol; the addition of ferrous chloride is 32mol% of 2,5-pyridinedicarboxylic acid;

[0040] (1....

Embodiment 2

[0049] A preparation method of a shock absorbing gasket, the specific steps are as follows:

[0050] (1) Preparation of thermoplastic polyester elastomer;

[0051] (1.1) Esterification reaction;

[0052] Mix the terephthalic acid, 1,4-butanediol, polytetrahydrofuran, 2,5-pyridinedicarboxylic acid and ferrous chloride into the reaction kettle evenly, and carry out the esterification reaction under the pressure of 3400Pa. The temperature of the reaction is 248°C, and the termination condition of the esterification reaction is: the distilled amount of water in the esterification reaction reaches 96% of the theoretical value;

[0053] The molar ratio of terephthalic acid, 1,4-butanediol and 2,5-pyridinedicarboxylic acid is 1.0:1.9:0.09, the addition amount of polytetrahydrofuran is 46% of terephthalic acid weight, the number average molecular weight of polytetrahydrofuran It is 2000g / mol; the addition of ferrous chloride is 37mol% of 2,5-pyridinedicarboxylic acid;

[0054] (1.2...

Embodiment 3

[0063] A preparation method of a shock absorbing gasket, the specific steps are as follows:

[0064] (1) Preparation of thermoplastic polyester elastomer;

[0065] (1.1) Esterification reaction;

[0066] Mix the terephthalic acid, 1,4-butanediol, polytetrahydrofuran, 2,5-pyridinedicarboxylic acid and ferrous chloride into the reaction kettle evenly, and carry out the esterification reaction under the pressure of 3700Pa. The temperature of the reaction is 246°C, and the termination condition of the esterification reaction is: the amount of water distilled in the esterification reaction reaches 97% of the theoretical value;

[0067] The molar ratio of terephthalic acid, 1,4-butanediol and 2,5-pyridinedicarboxylic acid is 1.0:2:0.10, the addition amount of polytetrahydrofuran is 40% of terephthalic acid weight, the number average molecular weight of polytetrahydrofuran It is 2000g / mol; the addition of ferrous chloride is 38mol% of 2,5-pyridinedicarboxylic acid;

[0068] (1.2) ...

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Abstract

The invention relates to a preparation method of a shock absorbing gasket. The shock absorbing gasket uses thermoplastic polyester elastomer, EVA foam master batch and titanium dioxide as raw materials, and the shock absorbing gasket is prepared by injection molding; thermoplastic polyester elastic The polyester segment of the body includes a terephthalic acid segment, a 1,4-butanediol segment, a 2,5-pyridinedicarboxylic acid segment and a polytetrahydrofuran segment, and the 2,5- Fe 2+ Coordination; the molar ratio of the terephthalic acid segment to the 2,5-pyridinedicarboxylic acid segment is 1:0.08~0.1; the tensile strength of the shock-absorbing gasket is ≥15MPa, the elongation at break is ≥230%, and the compression is permanent Deformation≤13%, low temperature impact strength≥36kJ / m 2 , surface TABER wear ≤ 8mg; the present invention is FeCl 2 The tensile strength, compression resistance, low temperature impact strength and wear resistance of the coordinated thermoplastic polyester elastomer have been enhanced to a certain extent. It is beneficial to the foaming of thermoplastic polyester elastomers and the stability of bubbles, which expands its application range.

Description

technical field [0001] The invention belongs to the technical field of railway damping gaskets, and relates to a preparation method of damping gaskets. Background technique [0002] The synthesis of polyester thermoplastic elastomer TPEE is mainly a copolymer formed by block polymerization of two different soft and hard segments. Therefore, the formed copolymer not only has a high melting point, high strength and high thermal stability of the hard segment but also has The soft segment has excellent elasticity, yield resistance and processability. The composed hard segment material is mainly polyethylene terephthalate or polybutylene terephthalate with crystalline properties. The crystalline hard segment material endows high hardness, mechanical properties and thermal stability. Soft segment materials are non-crystalline polyether or polyester. [0003] Compared with thermoplastic polyurethane, polyester thermoplastic elastomer has significantly higher mechanical properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/06C08L23/08C08K3/22C08G63/685C08G63/78C08K3/16C08J9/00
CPCC08J9/0066C08G63/6856C08G63/78C08K3/16C08J2375/06C08J2423/08
Inventor 尚束元范红卫李文刚王丽丽杨超明孙文路张元华
Owner JIANGSU HENGLI CHEM FIBER
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