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Synthesis method of high-performance thermoplastic polyurethane elastomer

A technology of thermoplastic polyurethane and synthesis method, which is applied in the synthesis field of high-performance thermoplastic polyurethane elastomer, can solve the problems of affecting performance, prone to aging and degradation, strong radiation, etc., and achieves time saving, good aging resistance and degradation resistance. , the effect of a wide range of applications

Inactive Publication Date: 2010-09-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The polyurethane elastomer prepared by the existing method has great limitations in the application of special conditions such as high temperature and high humidity, strong radiation, long-term exposure to the sun, and continuous solvent immersion, and is prone to aging and degradation, which affects its performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of synthetic method of high-performance thermoplastic polyurethane elastomer, comprises the following steps:

[0020] First, add a total of 0.005 mol of polycaprolactone (PCL), polyethylene glycol (PEG) and 0.01 mol of ethylene glycol into a three-necked flask with a capacity of 500 ml equipped with a stirrer and a thermometer to form a binary Alcohol system, the content ratio between different types of oligomer diols is not limited; the diol system is heated to 90°C, and vacuum dehydrated under the pressure of -85.5MPa for 1 hour and stirred evenly, then cooled to 50°C spare;

[0021] Next, add 0.01 mol of diisocyanate to the spare diol system after vacuum dehydration in the previous step, keep the isocyanate index at 0.5, then raise the temperature to 80°C, and keep it warm for 2 hours; after degassing, discharge the material until it is coated with silicone oil In the mold of the molding agent;

[0022] Finally, place the reactants in the mold in the previou...

Embodiment 2

[0024] A kind of synthetic method of high-performance thermoplastic polyurethane elastomer, comprises the steps:

[0025] First, in a three-necked flask with a capacity of 500ml equipped with a stirrer and a thermometer, adding a total amount of 0.06mol polyethylene glycol (PEG), polytetrahydrofuran (PTMG) and 0.09mol C8 glycol to form a glycol system, The content ratio between different types of oligomer diols is not limited; heat the system to 95°C, and vacuum dehydrate it below -92.5Mpa for 2 hours and stir evenly, then cool down to 60°C for use;

[0026] Secondly, add 0.08mol diisocyanate to the diol system after vacuum dehydration and cool down, keep the isocyanate index at 0.8, then raise the temperature to 120°C, keep the reaction time for 2 hours; discharge the material after degassing until it is coated with silicone oil release agent in the mold;

[0027] Finally, the reactants in the mold in the previous step were aged at 80°C for 8 hours, and then exposed to the a...

Embodiment 3

[0029] A kind of synthetic method of high-performance thermoplastic polyurethane elastomer, comprises the steps:

[0030] First, add a total amount of 0.012mol polyethylene adipate (PEA), polyethylene adipate (PAA) and 0.005mol polyethylene adipate (PAA) in a three-necked flask with a capacity of 500ml equipped with a stirrer and a thermometer C18 diols to form a diol system, the content ratio between different types of oligomer diols is not limited; heat the system to 90 ° C, and vacuum dehydration at -95.5Mpa pressure for 3 hours and stir evenly , and then cooled to 80°C for later use;

[0031] Next, add 0.07 mol of diisocyanate to the diol system after vacuum dehydration and cool down, keep the isocyanate index at 1.5, then raise the temperature to 130°C, keep the reaction time for 2.5 hours; after degassing, discharge the material until it is coated with silicone oil and release the mold In the mold of the agent;

[0032] Finally, place the reactants in the mold in the p...

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Abstract

The invention relates to a synthesis method of a high-performance thermoplastic polyurethane elastomer. The synthesis method comprises the following steps of: firstly, adding 0.005-0.1 mol of two or more than two different kinds of oligomer diol (polycaprolactone (PCL), polyethyleneglycol (PEG), polyoxytetramethylene (PTMG), polypropylene glycol (PPG), polyethylene glycol adipate (PEA) or poly hexamethylene adipate (PAA), and the like) and 0.01-0.1 mol of chain extender (C2-C18) to a three-neck flask to form a diol system; heating the diol system to 90-150 DEG C, dewatering in vacuum under the pressure of -85.5 MPa to -95.5 MPa for 1-5h; secondarily, adding 0.01-0.1 mol of vulcabond, increasing the temperature to 80-130 DEG C, reacting at a retained temperature for 1.5-2.5h; degassing and discharging to a die coated with a silicone release agent; and finally, aging reaction substances in the die at 60-150 DEG C for 5-20h; and then, exposing in air for 5-10 days to fully react. The invention has the advantages of low energy consumption, time saving, convenient processing and forming, low production cost and suitability for mass popularization.

Description

technical field [0001] The invention belongs to the technical field of synthesizing polyurethane elastomers, in particular to a synthesis method of high-performance thermoplastic polyurethane elastomers. Background technique [0002] Polyurethane (PU) elastomer refers to a type of elastomeric polymer containing more carbamate functional groups (-N hours -CO-O-) on the main chain of the macromolecule, and is a typical multi-block copolymer. It is usually prepared by addition reaction of oligomer polyol (polyether or polyester) with polyisocyanate, and then with chain extender. [0003] In polyurethane (PU) elastomers, due to the incompatibility of soft and hard segments, there is an obvious microphase separation structure, in which the soft segment phase provides elasticity, and the hard segment phase plays the role of reinforcing filling and crosslinking. Due to the polar characteristics of the carbamate group, the ability to form hydrogen bonds between groups, and the diff...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42
Inventor 张敏张宝峰李猛
Owner SHAANXI UNIV OF SCI & TECH