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A kind of preparation method of graphene modified waterborne polyurethane

A water-based polyurethane and graphene modification technology, which is applied in the preparation and application of new materials and functional polymer materials, can solve the problems of unreported modified water-based polyurethane, difficult large-scale industrial production, and complicated preparation processes, and achieves a combination of Tight, not easy to separate, good wrapping effect

Active Publication Date: 2018-11-27
HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN104861643A uses the improved Hummers method to prepare graphene oxide aqueous dispersion, then uses ethylenediamine to reduce modified graphene oxide to obtain modified graphene aqueous solution, and blends it with water-based polyurethane to obtain graphene / water-based polyurethane composite material. The compatibility of each component is good, and graphene modification improves the thermal stability and mechanical strength of water-based polyurethane; however, the preparation process is complicated, and strong acids such as concentrated sulfuric acid, hydrochloric acid, and potassium permanganate, and pro-oxidant raw materials are required, which is safe. bad sex
Patent CN104277198A prepares amidated graphene intermediates by acidifying graphene nanosheets, modifying carboxyl groups on its surface, and then condensing with acrylamide. Through in-situ polymerization, a graphene-based conductive Flame-retardant water-based polyurethane coating emulsion; the dispersion of amidated graphene in polyurethane emulsion is enhanced, and flame-retardant and conductive properties are introduced; however, acidification treatment requires the use of concentrated sulfuric acid and concentrated nitric acid, which is not safe, and The preparation process is complicated, and it is difficult to realize large-scale industrial production
[0005] In recent years, people have strengthened the research on graphene materials, and the mass production technology of graphene has been realized, but the direct use of commercialized graphene to modify waterborne polyurethane has not yet been reported.

Method used

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  • A kind of preparation method of graphene modified waterborne polyurethane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Add 40 g of polyethylene adipate with a molecular weight of 1000 into the reaction flask, distill under reduced pressure at 100°C for 30 minutes, cool down to 60°C, add 20g of toluene diisocyanate, 0.2g of dibutyltin dilaurate, and heat up React at 70°C for 4 hours;

[0041] (2) Cool down to 60°C, add 2g of 1,4-butanediol and 2g of 2,2-dimethylolpropionic acid, raise the temperature to 70°C and react for 4 hours until the NCO content reaches the theoretical value;

[0042] (3) cooling to 40° C., and after reducing the viscosity with 10 g of acetone, add 2 g of triethylamine, and react for 30 minutes to obtain a prepolymer of water-based polyurethane;

[0043] (4) Dilute 5g graphene SE1430 with 10g isopropanol, then mix with 10g methyltrimethoxysilane, stir and react at room temperature for 30 minutes to obtain graphene modified by silane coupling agent;

[0044] (5) The prepolymer of the water-based polyurethane obtained in step 3 is added to the graphene modified ...

Embodiment 2

[0046] (1) Add 60g of polytetrahydrofuran diol with a molecular weight of 2000 into the reaction flask, distill under reduced pressure at 100°C for 30 minutes, cool down to 60°C, add 40g of hexamethylene diisocyanate and 0.5g of stannous octoate, and heat up to 90°C React for 2 hours;

[0047] (2) Cool down to 60°C, add 5g of diethylene glycol and 8g of 2,2-dimethylolbutyric acid, raise the temperature to 90°C and react for 2 hours until the NCO content reaches the theoretical value;

[0048] (3) cooling to 60° C., and after reducing the viscosity with 20 g of butanone, add 5 g of ammonia water and react for 15 minutes to obtain a prepolymer of water-based polyurethane;

[0049] (4) Dilute 20g graphene SE1231 with 20g isopropanol, then mix with 40gKH560, stir and react at room temperature for 30 minutes to obtain graphene modified by silane coupling agent;

[0050] (5) Add the prepolymer of the waterborne polyurethane obtained in step 3 to the graphene modified by the silane ...

Embodiment 3

[0052] (1) Add 40g of polypropylene glycol with a molecular weight of 2000 into the reaction flask, distill under reduced pressure at 100°C for 60 minutes, cool down to 60°C, add 30g of isophorone diisocyanate and 0.3g of dibutyltin dilaurate, and heat up to 80°C React for 2 hours;

[0053] (2) Cool down to 60°C, add 3g of neopentyl glycol and 4g of 2,2-dimethylolpropionic acid, heat up to 80°C and react for 2 hours until the NCO content reaches the theoretical value;

[0054] (3) cooling to 40° C., and after reducing the viscosity with 10 g of tetrahydrofuran, add 3 g of triethanolamine and react for 15 minutes to obtain a prepolymer of water-based polyurethane;

[0055] (4) Dilute 10g graphene G-Powder with 15g isopropanol, then mix with 20g KH570, stir and react at room temperature for 30 minutes to obtain graphene modified by silane coupling agent;

[0056] (5) The prepolymer of the aqueous polyurethane that step 3 obtains is joined in the graphene that the silane couplin...

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Abstract

The invention relates to the field of a new material, in particular relates to the technical field of preparation and application of a functional high-polymer material, and discloses a preparation method of graphene modified waterborne polyurethane. According to the method disclosed by the invention, firstly, graphene is modified by a coupling agent and then is blended with waterborne polyurethane so as to implement excellent dispersion; meanwhile, a secondary chain extension mode is adopted and an interpenetrating network structure is introduced; after resin prepared by the method is formed into a film, the film has excellent hardness, flexibility, compactness, impact resistance, corrosion resistance, water resistance, aging resistance, pollution resistance and the like, and can be applied to the fields of automobile coating, wood lacquer, buildings, office furniture, leather and the like.

Description

technical field [0001] The invention relates to the field of new materials, in particular to the technical field of preparation and application of functional polymer materials. Background technique [0002] Water-based polyurethane is a polyurethane system that uses water instead of organic solvents as the dispersion medium. Compared with traditional solvent-based polyurethanes, water-based polyurethanes are non-toxic, non-flammable, and environmentally friendly, and the structure-performance of water-based polyurethanes can be adjusted. It has both the properties of elastomer and plastic, as well as excellent wear resistance and adhesion, etc. It is widely used in leather / synthetic leather finishing agents, fabric coating and finishing agents, coatings, adhesives, paper surface treatment agents and fiber surfaces Treatment agents and other fields have broad market prospects. However, the heat resistance and physical and mechanical properties of waterborne polyurethane are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/12C08G18/32C08G18/42C08G18/44C08G18/48C08G18/66C08K3/04C08K9/06
CPCC08G18/12C08G18/324C08G18/4238C08G18/44C08G18/4854C08G18/664C08G18/6674C08K3/04C08K9/06
Inventor 钱涛刘海龙郎伟敏刘海兵
Owner HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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