Preparation method and application of graphene modified polyurethane film-forming agent

A polyurethane film-forming agent and graphene modification technology, which is applied in polyurea/polyurethane adhesives, polyurea/polyurethane coatings, adhesives, etc., can solve the problems of large-scale preparation or application of difficult-to-conduct fibers, and reduce the surface area. The effect of low resistance, low reaction temperature and simple process

Active Publication Date: 2015-12-16
TAISHAN FIBERGLASS INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The antistatic composite material prepared by conductive fiber eliminates static electricity through the principle of electron conduction and corona discharge, which can eliminate static electricity in a very short time, and the fiber fillers are intricately overlapped to form a continuous conductive network, which can be obtained at a low filling amount. High conductivity, antistatic effect is significa

Method used

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preparation example Construction

[0024] The preparation of the graphene oxide used in the present invention:

[0025] (1) Low-temperature reaction, add 30mL of concentrated sulfuric acid to a dry beaker one by one, place in a low-temperature reaction bath, wait until the temperature of concentrated sulfuric acid is around 0°C, add 10g of graphite under strong stirring, and add potassium permanganate several times 30g, control the temperature of the reaction solution at 10-15°C and stir for two hours;

[0026] (2) Medium-temperature reaction, place the beaker in step (1) in a 35°C constant temperature water bath, and continue stirring for half an hour when the temperature of the reaction solution rises to 35°C;

[0027] (3) For high-temperature reaction, add deionized water under stirring, control the reaction temperature within 100°C, continue stirring for half an hour, dilute the reaction solution by 800~1000mL with deionized water, add 5% hydrogen peroxide, and filter while it is hot. Wash with 5% hydrochlo...

Embodiment 1

[0038] A preparation method of graphene modified polyurethane film-forming agent has the following steps:

[0039] (1) Under the protection of nitrogen, disperse graphene into a benign organic solvent tetrahydrofuran, stir and disperse evenly, add 2,4-toluene diisocyanate in an amount of 0.1% by mass, and react at 20-30°C for 0.1 hour , to obtain a functionalized graphene dispersion;

[0040] (2) According to the molar ratio of polyethylene glycol 200 and 2,4-toluene diisocyanate added in the previous step of 1.1:2, add polyethylene glycol 200 to the functionalized graphene dispersion obtained in the previous step, Control the reaction temperature at 25-40°C, add a benign organic solvent tetrahydrofuran to dilute when the viscosity of the system increases, and measure the residual isocyanate NCO group through real-time sampling of the mixture in the reaction system. When the mass fraction of the NCO group decreases to the initial value Half of the time, the graphene-modified ...

Embodiment 2

[0045] A preparation method of graphene modified polyurethane film-forming agent has the following steps:

[0046] (1) Under the protection of nitrogen gas, disperse graphene oxide into a benign organic solvent N,N-dimethylacetamide, stir and disperse evenly, add diphenylmethane diisocyanate in an amount of 50% by mass, and After reacting at 90-100°C for 20 hours, a functionalized graphene dispersion is obtained;

[0047] (2) According to the molar ratio of polytetrahydrofuran polyether 2000 diol and diphenylmethane diisocyanate added in the previous step of 1.9:2, add polytetrahydrofuran polyether diol 2000 to the functionalized graphite obtained in the previous step In the olefin dispersion, control the reaction temperature at 140-150°C, add a benign organic solvent N,N-dimethylacetamide to dilute when the viscosity of the system increases, and carry out real-time sampling of the mixture in the reaction system to check the residual isocyanate NCO group Determination, when t...

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Abstract

The invention provides a preparation method of a graphene modified polyurethane film-forming agent. The method includes: reacting polyether diols or polyether polyol with isocyanate modified graphene or functional graphene to generate an isocyanate-terminated prepolymer, then subjecting the prepolymer to chain extension with diol amine or triol amine, finally performing end-capping with alkylamine, a hydroxyl compound or dialkyl alcohol amine compound, then carrying out acidizing neutralization, and adding water to conduct emulsification, removing the organic solvent by vaporization so as to obtain the graphene modified polyurethane film-forming agent. The method provided by the invention has the characteristics of low reaction temperature, simple process, and recyclability of solvent, and is atom economic reaction without ''three wastes''. The obtained film-forming agent can be used as conductive paint and film-forming agent to prepare glass fiber drawing impregnating agents, fabric sizing agents, leather finishing agents, carbon fiber sizing agents, adhesives or paint, etc. The film-forming agent can effectively reduce the material surface resistance, and can be used in the antistatic or electromagnetic shielding material field.

Description

technical field [0001] The invention relates to the technical field of preparing an antistatic or conductive film-forming agent, and specifically relates to a method for preparing a graphene-modified polyurethane film-forming agent. Background technique [0002] Sizing agent is an indispensable material in glass fiber drawing and weaving. After the drawing process, glass fiber is treated with glass fiber sizing agent to improve its processing performance, and can produce strong adhesion with reinforced resin. Sizing agent It plays the role of making fibers bonded and bundled, lubricating and wear-resistant, and removing static electricity. The raw material and formula technology of sizing agent are the most critical technology to reflect the inherent quality of various glass fiber products (including yarn, cloth, felt), and are also indispensable industrial consumables in glass fiber production. Its importance is often equated with the "chip manufacturing technology" of the...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D175/08C09D175/06C08G18/76C08G18/73C08G18/75C08G18/66C08G18/48C08G18/42C08G18/44C08G18/10C08K9/06C08K9/04C08K9/02C08K3/04D06M15/568D06M15/572C09J175/04C09J175/06C09J175/08
Inventor 潘春呈刘洪刚侯勇赵剑英孙林英
Owner TAISHAN FIBERGLASS INC
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