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Synthesis method of hydroxyl-terminated liquid fluororubber modified polyurethane modulus gradient material

A technology of liquid fluororubber and synthesis method, which is applied in the field of synthesis of polyurethane modulus gradient materials, can solve the problems of non-overlapping functional areas, and achieve the effects of good product quality, easy reaction control, and stable product quality

Active Publication Date: 2019-02-01
承德京工卓能新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are some unavoidable problems in traditional polymer materials. First, traditional polymer materials have high elasticity in the rubber state, but their damping performance has a maximum value in the glass transition region. When an elastic material is required to have both high elasticity and When the damping performance is high, the traditional polymer material has the disadvantage that the functional areas do not overlap; secondly, in the glass transition region, the elastic modulus of the traditional rubber material changes greatly with the temperature change, showing a high degree of temperature sensitivity. The prepared gradient material is characterized by the absence of a transition region between the glassy state and the rubbery state

Method used

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  • Synthesis method of hydroxyl-terminated liquid fluororubber modified polyurethane modulus gradient material
  • Synthesis method of hydroxyl-terminated liquid fluororubber modified polyurethane modulus gradient material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 100g of polyoxypropylene glycol (PPG 1000) and 5g of hydroxyl-terminated liquid fluororubber (vinylidene fluoride-hexafluoropropylene copolymer) into a 500mL three-necked flask, put on a thermometer, stirrer, 105 ° C, vacuum -0.1 Dehydration under reduced pressure at MPa. After 3 hours of dehydration, the temperature began to drop. After the temperature dropped to room temperature, 27g of toluene diisocyanate (2,4-TDI) was added, and 0.7g of dibutyltin dilaurate was added. The reaction was carried out at room temperature for 0.5h and at 85°C for 2.5h to obtain polyurethane prepolymer. Continue to add 0.66g of N,N-dimethylbenzylamine, 13.2g of anhydrous acetone and 13.2g of bisphenol A diglycidyl ether to the reaction system, vacuum defoaming at 60°C and stir evenly before use. Turn on the computer-controlled syringe pumps (A, B) with two dosing. Add 60ml of polyurethane prepolymer mixed with catalyst to the A syringe pump, and fill the B syringe pump with 60ml of a...

Embodiment 2

[0026]Add 100g of polyoxypropylene glycol (PPG 1000) and 15g of hydroxyl-terminated liquid fluororubber (vinylidene fluoride-hexafluoropropylene copolymer) into a 500mL three-necked flask, put on a thermometer, stirrer, 105 ° C, vacuum -0.1 Dehydration under reduced pressure at MPa. After 3 hours of dehydration, the temperature began to drop. After the temperature dropped to room temperature, 29g of toluene diisocyanate (2,4-TDI) was added, and 0.77g of dibutyltin dilaurate was added. The reaction was carried out at room temperature for 0.5h and at 85°C for 2.5h to obtain polyurethane prepolymer. Continue to add 0.72g of N,N-dimethylbenzylamine, 14.4g of anhydrous acetone and 14.4g of bisphenol A diglycidyl ether into the reaction system, vacuum defoaming at 60°C and stir evenly before use. Turn on the computer-controlled syringe pumps (A, B) with two dosing. Add 60ml of polyurethane prepolymer mixed with catalyst to the A syringe pump, and fill the B syringe pump with 60ml o...

Embodiment 3

[0029] Add 100g of polyoxypropylene glycol (PPG 1000) and 20g of hydroxyl-terminated liquid fluororubber (vinylidene fluoride-hexafluoropropylene copolymer) into a 500mL three-necked flask, put on a thermometer, stirrer, 105 ° C, vacuum -0.1 Dehydration under reduced pressure at MPa. After 3 hours of dehydration, the temperature began to drop. After the temperature dropped to room temperature, 30g of toluene diisocyanate (2,4-TDI) was added, and 0.8g of dibutyltin dilaurate was added. The reaction was carried out at room temperature for 0.5h and at 85°C for 2.5h to obtain polyurethane prepolymer. Continue to add 0.75g of N,N-dimethylbenzylamine, 15g of anhydrous acetone and 15g of bisphenol A diglycidyl ether into the reaction system, vacuum defoam at 60°C and stir evenly before use. Turn on the computer-controlled syringe pumps (A, B) with two dosing. Add 60ml of polyurethane prepolymer mixed with catalyst to the A syringe pump, and fill the B syringe pump with 60ml of aroma...

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Abstract

The invention provides a synthesizing method of a hydroxyl-terminated liquid fluorine rubber modified polyurethane material with gradient modulus. The method comprises the steps that 1, polyether diol with a low molecular weight, hydroxyl-terminated liquid fluorine rubber and aromatic diisocyanate serve as the raw materials to synthesize an isocyanate-terminated modified polyurethane prepolymer; 2, the product in the first step is mixed with different mole ratios of aromatic diisocyanate, a cyclotrimerization reaction is conducted in a solvent in the ontological status, and the hydroxyl-terminated liquid fluorine rubber modified polyurethane material with the gradient modulus is obtained finally. The synthesizing method has the advantages that the reaction system is low in viscosity, and synthesis of the isocyanate-terminated polyurethane prepolymer is promoted; the method is novel, the reaction is easy to control, and the product is good and stable in quality. The obtained polyurethane material with the gradient modulus is good in toughness, temperature resistance and chemical medium resistance, and the elasticity modulus has gradualness along with changes of temperature.

Description

technical field [0001] The invention relates to a method for synthesizing a polyurethane modulus gradient material modified by a hydroxyl-terminated liquid fluorine rubber. Involves a modulus and other physical properties can be continuously changed along the length of the same sample, three-dimensional cross-linked structure containing isocyanate three-membered rings and hydroxyl-terminated liquid fluorine-modified flexible link chains without interfacial polyurethane modulus Synthesis of gradient materials. Background technique [0002] The production of Functionally Gradient Materials (FGM) is not the crystallization of a single human wisdom, but an exquisite and specific structure formed by some organisms in nature for a long time to adapt to the growth environment. Therefore, nature provides us with Interesting examples of structure—special structures formed by gradually changing composition to provide unique mechanical properties. The earliest research on gradient ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/62C08G18/48
CPCC08G18/6279C08G18/7614C08G18/7671
Inventor 江盛玲徐凤伟张时涛张孝阿吕亚非
Owner 承德京工卓能新材料科技有限公司
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