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Composite modified aqueous polyurethane, preparation method and applications thereof

A water-based polyurethane and composite modification technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of easy agglomeration, low reactivity, and influence on the performance of polymer composite materials, and achieves good adhesion and preparation method. Simple, acid and salt water resistant results

Inactive Publication Date: 2016-12-21
HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since graphene is neither hydrophilic nor oleophilic, and has low reactivity, and its strong tendency to stack between adjacent sheets, it is easy to agglomerate in polymers, making polymer composites the performance of the

Method used

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  • Composite modified aqueous polyurethane, preparation method and applications thereof
  • Composite modified aqueous polyurethane, preparation method and applications thereof
  • Composite modified aqueous polyurethane, preparation method and applications thereof

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preparation example Construction

[0029] The invention provides a kind of preparation method of composite modified waterborne polyurethane, comprising the following steps:

[0030] 1) Preparation of prepolymer: Add macromolecular polyol and polyisocyanate to catalyst prepolymerization, add small molecule alcohol chain extender and small molecule carboxylic acid chain extender, add salt forming agent after dilution, and obtain waterborne polyurethane prepolymer ;

[0031] In this step, the water-based polyurethane has a more branched chain structure through the small molecule alcohol chain extender and the small molecule carboxylic acid chain extender, and the crosslinking degree of the water-based polyurethane is improved, thereby improving the hardness, flexibility, and compactness of the water-based polyurethane. Improvements in physical properties provide the basis;

[0032] In this step, macromolecule polyol is polyester polyol or polyether polyol, and its relative molecular weight is 1000 or 2000, and wh...

Embodiment 1

[0051] 1) Preparation of prepolymer: Add 40g 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 70°C, add 20g of toluene diisocyanate and 0.2g of dilauric acid Dibutyltin, reacted for 2 hours;

[0052] Cool down to 50°C, add 2g 1,4-butanediol, 2g 2,2-dimethylolpropionic acid, 2g trimethylolpropane, and react for 4 hours until the NCO content reaches the theoretical value;

[0053] After cooling down to 40°C and reducing the viscosity with 10g of acetone, add 2g of triethylamine and react for 30 minutes to obtain a prepolymer of water-based polyurethane;

[0054] 2) Modification of silica sol: Dilute 20 g of acidic silica sol with 10 g of isopropanol, then mix with 10 g of methyltrimethoxysilane, stir and react at room temperature for 4 hours, to obtain silica sol modified by silane coupling agent;

[0055] 3) Emulsification: Add the water-based polyurethane prepolymer obtained i...

Embodiment 2

[0059] 1) Preparation of prepolymer: 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 70°C, add 40g of hexamethylene diisocyanate, 0.5g of stannous octoate, React for 2 hours;

[0060] Cool down to 55°C, add 5g of diethylene glycol, 8g of 2,2-dimethylolbutyric acid and 3g of trimethylolpropane, and react for 4 hours until the NCO content reaches the theoretical value;

[0061] After cooling down to 45°C and reducing the viscosity with 20g butanone, add 5g of ammonia water and react for 15 minutes to obtain a prepolymer of water-based polyurethane;

[0062] 2) Modified silica sol: Dilute 80g of acidic silica sol with 20g of isopropanol, then mix it with 40g of KH560, stir and react at room temperature for 4h, to obtain silica sol modified by silane coupling agent;

[0063] 3) Emulsification: Add the water-based polyurethane prepolymer obtained in step 1) to the sila...

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Abstract

The invention discloses a composite modified aqueous polyurethane, a preparation method and applications thereof. The preparation method comprises: 1) adding a small molecule alcohol chain extender and a small molecule carboxylic acid chain extender during a prepolymer preparation process; 2) modifying an acid silica sol by using a silane coupling agent; 3) carrying out a reaction on the modified acid silica sol and an aqueous polyurethane prepolymer to obtain a silica sol modified aqueous polyurethane; 4) modifying graphene by using a silane coupling agent; and 5) carrying out compounding modification, wherein the modified graphene and the silica sol modified aqueous polyurethane are uniformly mixed, and a reaction is performed to obtain the composite modified aqueous polyurethane. According to the present invention, with the method, the silica sol and the graphene can be stably and uniformly dispersed in the aqueous polyurethane, such that the agglomeration among the particles can be avoided; the method is simple and convenient and is easy to industrialize; and the advantages of excellent hardness, excellent flexibility, excellent compactness, excellent impact resistance, excellent corrosion resistance, excellent water resistance and the like are provided after the composite modified aqueous polyurethane forms the film.

Description

technical field [0001] The invention relates to the field of chemical synthesis of new materials, in particular to the technical field of preparation and application of functional polymer materials, and more specifically relates to a composite modified water-based polyurethane and its preparation method and application. 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/10C08G18/42C08G18/48C08G18/38C08G18/34C08G18/32C08K9/06C08K3/36C08K3/04C09D175/08C09D175/06C09D7/12
CPCC08G18/10C08G18/3895C08G18/4238C08G18/4825C08G18/4854C08G18/6659C08G18/6692C08G2150/90C08K3/04C08K3/36C08K9/06C09D175/06C09D175/08C08G18/348C08G18/3206
Inventor 钱涛刘海龙郎伟敏刘海兵
Owner HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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