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Method for synthesizing thermoplastic polyurethane capable of realizing ultraviolet cross-linking

A technology of thermoplastic polyurethane and synthesis method, applied in the field of thermoplastic polyurethane elastomer synthesis, can solve the problems of increased cost, only about two weeks, high price, etc., and achieve the effect of improved swelling resistance and low deformation

Active Publication Date: 2019-01-04
大连中海达科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Modern hydraulic systems are often used in long working hours, high temperature, high strength, and high frequency operating conditions, such as hydraulic breakers for engineering vehicles. The seals of this type of hydraulic system are mainly imported, which are not only expensive but also The average service life is only about two weeks. Frequent replacement of the seals in the hydraulic system forces the engineering vehicle to stop for maintenance, which wastes man-hours and increases costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0025] (1) Melt 10KG of polyadipate-1,4-butylene glycol and 2.5KG of hydroxyl-terminated poly-1,4-butadiene into the reactor F, heat to 110°C, and After dehydration at -0.095MPa for 2 hours, cool down to 90°C and stir evenly for use. Take 7.4KG of pure MDI and heat it to melt and control the temperature to 70°C, then add the pure MDI at 70°C to the stirred reactor F in 3 times, and control the temperature of the material in the reactor to 80°C to 90°C. After 2.5 hours, take a sample and titrate the NCO content with the di-n-butylamine method. After reaching the design value, stop the reaction and control the temperature to 80°C to obtain a thermoplastic polyurethane prepolymer.

[0026] (2) Take 2.06KG of chain extender 1,4-butanediol, 0.01g of organic bismuth and 80°C thermoplastic polyurethane prepolymer at a melting temperature of 70°C, and quickly mix them in a vacuum mixer for 30 seconds, then put them into the prepolymer Heat it in a tray at 160°C for curing and molding...

Synthetic example 2

[0029] (1) Melt 10KG of polyadipate-1,4-butylene glycol and 2.5KG of hydroxyl-terminated poly-1,4-butadiene into the reactor F, heat to 110°C, and After dehydration at -0.095MPa for 2 hours, cool down to 90°C and stir evenly for use. Take 5.4KG of pure MDI and heat it to melt and control the temperature to 70°C, then add the pure MDI at 70°C to the stirred reactor F in 3 times, and control the temperature of the material in the reactor to 80°C to 90°C. After 2.5 hours, take a sample and titrate the NCO content with the di-n-butylamine method. After reaching the design value, stop the reaction and control the temperature to 80°C to obtain a thermoplastic polyurethane prepolymer.

[0030] (2) Take 2.92KG of chain extender hydroquinone dihydroxyethyl ether, 0.1g of organic bismuth, and thermoplastic polyurethane prepolymer heated to 95°C at a melting temperature of 120°C and quickly mix them in a vacuum mixer for 30 seconds Then put it into a preheated tray at 160°C for curing a...

Synthetic example 3

[0033] (1) Melt 10KG of polycaprolactone diol and 2.5KG of hydroxyl-terminated poly-1,4-butadiene into the reactor F, heat to 110°C, dehydrate under vacuum -0.095MPa for 2 hours and then cool down Stir evenly at 90°C and set aside. Take 5.4KG of pure MDI and heat it to melt and control the temperature to 70°C, then add the pure MDI at 70°C to the stirred reactor F in 3 times, and control the temperature of the material in the reactor to 80°C to 90°C. After 2.5 hours, take a sample and titrate the NCO content with the di-n-butylamine method. After reaching the design value, stop the reaction and control the temperature to 80°C to obtain a thermoplastic polyurethane prepolymer.

[0034] (2) Take 2.92KG of chain extender hydroquinone dihydroxyethyl ether, 0.1g of organic bismuth, and thermoplastic polyurethane prepolymer heated to 95°C at a melting temperature of 120°C and quickly mix them in a vacuum mixer for 30 seconds Then pour it into a tray preheated at 160°C for curing an...

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PUM

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Abstract

The invention provides a method for synthesizing thermoplastic polyurethane capable of realizing ultraviolet cross-linking. The material can be processed through an injection molding technology, and the aims of batches, high precision and a low processing cost are realized. Meanwhile, through ultraviolet cross-linking, the heat resistance, deformation-resistant performance and swelling-resistant performance of the thermoplastic polyurethane can be improved greatly to meet the physical property demands of special hydraulic sealing parts, the frequency of maintenance of a hydraulic system is lowered, and the service life of the thermoplastic polyurethane is prolonged. The product obtained through the invention can be further suitable for products under other similar working conditions. The thermoplastic polyurethane capable of realizing ultraviolet cross-linking is suitable for the high-temperature and high-frequency hydraulic sealing parts, the temperature resistance, low deformation and swelling-resistant performance of the thermoplastic polyurethane are improved substantially, and the problem can be solved that common polyurethane can not meet using demands under the type of working condition.

Description

technical field [0001] The invention relates to a method for synthesizing a thermoplastic polyurethane elastomer that can be crosslinked by ultraviolet light for a high-temperature, high-frequency hydraulic seal. Background technique [0002] Thermoplastic polyurethane elastomer (TPU) has both the flexibility of rubber materials and the rigidity of plastic materials, and is now used in many industries such as industry, agriculture, medical care, sports equipment, and daily necessities. However, because ordinary TPU has a linear structure (or a very small part of chemical crosslinking), it also has the "common problems" of thermoplastic materials, namely: poor heat resistance, large permanent deformation, and poor swelling performance. However, cast polyurethane, although it has a partial cross-linked structure, has low processing efficiency, high energy consumption, high loss, high scrap rate, limited improvement in heat resistance, permanent deformation and other properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/69C08G18/66C08G18/42C08G18/12C08G18/32C08L75/14
CPCC08G18/12C08G18/4238C08G18/4277C08G18/698C08G18/7671C08L75/14C08L2201/08C08L2312/00C08G18/3206C08G18/3215
Inventor 王东凯
Owner 大连中海达科技有限公司