Graphene modified waterborne polyurethane resin and preparation method thereof

A water-based polyurethane and graphene modification technology, applied in polyurea/polyurethane coatings, antifouling/underwater coatings, coatings, etc., can solve the problems of easy foaming, high surface tension, and poor water resistance of the coating film, and achieve Good antistatic properties, UV resistance, anti-corrosion effects

Inactive Publication Date: 2018-03-09
QINGDAO REALEADER ADVANCED MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When traditional solvent-based materials are used, there is pollution from organic fusion agents, which has a serious impact on production workers and the ecological environment. Water-based polyurethane is a polyurethane emulsion that uses water as a dispersion medium. In addition to the excellent performance of solvent-based polyurethane, it also has It has the advantages of simple use, non-toxicity, and no environmental pollution. However, since water-based polyurethane emulsion uses water as a diluent, the surface tension of the medium water is relatively large, which leads to the disadvantages of poor surface spreading and low mechanical properties during the film formation process. The hydrophilic group of water-based polyurethane stably dispersed in the medium water will cause water-based polyurethane to have poor water resistance and easy water absorption after film formation, resulting in the disadvantages of easy foaming of the coating film.

Method used

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  • Graphene modified waterborne polyurethane resin and preparation method thereof
  • Graphene modified waterborne polyurethane resin and preparation method thereof
  • Graphene modified waterborne polyurethane resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of graphene modified waterborne polyurethane resin and preparation method thereof, its preparation technology is as follows:

[0027] a. In a four-necked bottle equipped with a thermometer, a condenser, and an agitator, add 10 parts of polyester polyol, 2 parts of dimethylol propionic acid, and 1 part of graphene aqueous dispersion, and heat to 100 ℃, stir for 1.5 hours to fully remove the moisture in the raw materials;

[0028] b. Immediately pass nitrogen after the vacuum is stopped, cool the four-neck bottle to 60°C, add 10 parts of TDI, and react for 3 hours; add 7 parts of acetone, measure the NCO value, and stop the reaction when the measured value is close to the theoretically calculated value;

[0029] c. Stop feeding nitrogen, continue stirring, lower the temperature to 40°C, add 1 part of triethylamine to react for 10 minutes, add 67 parts of deionized water under vigorous stirring, and continue stirring at high speed for 10 minutes;

[0030] d. Slowly...

Embodiment 2

[0032] A kind of graphene modified waterborne polyurethane resin and preparation method thereof, its preparation technology is as follows:

[0033] a. Add 18 parts of polyester polyol, 3 parts of methyldiethanolamine, and 2 parts of graphene aqueous dispersion into a four-necked bottle equipped with a thermometer, condenser, and stirrer, and heat to 105°C under vacuum conditions. Stir for 1.5h to fully remove the moisture in the raw materials;

[0034] b. Immediately pass nitrogen after the vacuum is stopped, cool the four-necked bottle to 65°C, add 13 parts of HDI, and react for 3.5 hours; add 12 parts of acetone, measure the NCO value, and stop the reaction when the measured value is close to the theoretically calculated value;

[0035] c. Stop feeding nitrogen, continue stirring, cool down to 38°C, add 1.5 parts of ammonia water to react for 13 minutes, add 48 parts of deionized water under vigorous stirring, and continue stirring at high speed for 15 minutes;

[0036] d. ...

Embodiment 3

[0038] A kind of graphene modified waterborne polyurethane resin and preparation method thereof, its preparation technology is as follows:

[0039] a. In a four-necked bottle equipped with a thermometer, a condenser, and an agitator, add 18 parts of polyether polyol, 3 parts of sodium ethylenediaminoethanesulfonate, and 3 parts of graphene aqueous dispersion, and heat under vacuum conditions To 115°C, stir for 1.5 hours to fully remove the moisture in the raw materials;

[0040] b. Immediately pass nitrogen after the vacuum is stopped, cool the four-necked bottle to 80°C, add 15 parts of IPDI, and react for 4 hours; add 13 parts of acetone, measure the NCO value, and stop the reaction when the measured value is close to the theoretically calculated value;

[0041] c. Stop feeding nitrogen, continue stirring, lower the temperature to 40°C, add 2.5 parts of dimethylethanolamine to react for 20 minutes, add 41.5 parts of deionized water under vigorous stirring, and continue stirr...

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Abstract

The invention discloses graphene modified waterborne polyurethane resin and a preparation method thereof. The preparation method specifically includes: subjecting graphene oxide obtained through a Hummers method to functional modification and dispersing to obtain a high-concentration graphene aqueous dispersion; adding polyester polyol (or polyether polyol) and a hydrophilic chain extender which are of formula ratio into the graphene aqueous dispersion, evenly stirring, and removing moisture under a vacuum condition; feeding nitrogen immediately after the vacuum condition is ended, adding diisocyanate of formula ratio, performing heating and stirring reaction for a certain time, then stopping nitrogen feeding, and adding a neutralizing agent; adding deionized water, performing high-speed dispersing for a certain time, then adding a small-molecule chain extender to perform reaction, and discharging. The preparation method has the advantages that the method is simple and controllable inoperation and capable of easily preparing and synthesizing the graphene modified waterborne polyurethane resin in a large-batch manner; the graphene modified waterborne polyurethane resin prepared bythe method is good in adhesive force, corrosion resistance and impact resistance and widely applicable to fields such as the marine field, steel structures, anti-static coating, conductive coating andantifouling and waterproof coating.

Description

technical field [0001] The invention belongs to the technical field of water-based resin synthesis, and relates to a graphene-modified water-based polyurethane resin and a preparation method thereof. Background technique [0002] With the enhancement of people's awareness of environmental protection, more and more attention has been paid to the issue of material safety. When traditional solvent-based materials are used, there is pollution from organic fusion agents, which has a serious impact on production workers and the ecological environment. Water-based polyurethane is a polyurethane emulsion that uses water as a dispersion medium. In addition to the excellent performance of solvent-based polyurethane, it also has It has the advantages of simple use, non-toxicity, and no environmental pollution. However, since water-based polyurethane emulsion uses water as a diluent, the surface tension of the medium water is relatively large, which leads to the disadvantages of poor su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/73C08G18/75C08G18/66C08G18/42C08G18/48C08G18/12C08G18/32C08G18/34C08K3/04C09D175/06C09D5/24C09D5/08C09D5/16
CPCC08G18/12C08G18/3275C08G18/348C08G18/3857C08G18/42C08G18/48C08G18/6655C08G18/6659C08G18/6685C08G18/73C08G18/755C08G18/7614C08G2150/90C08K3/04C09D5/08C09D5/1662C09D5/24C09D175/06C08G18/3206C08G18/3228
Inventor 耿光强李智璐刘贝贝车云霞
Owner QINGDAO REALEADER ADVANCED MATERIALS TECH
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