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A kind of anticorrosion type polyurethane water-based coating and preparation method thereof

A water-based coating and polyurethane technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve problems such as high surface tension of water, cross-linking of difficult-to-film-forming substances to form a film layer, and corrosion resistance of the film layer. , to achieve the effect of smooth surface, good self-cleaning property and long aging resistance

Active Publication Date: 2021-10-29
扬州豪扬新型建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based coatings are coatings prepared with water as the main solvent, but the introduction of water also brings a series of problems. The surface tension of water is large, and pigments and fillers cannot be fully dispersed, and water molecules are easy to enter the interior of the matrix and cause corrosion. It is often necessary to add an appropriate amount of additives to improve the performance of water-based coatings
However, additives such as wetting agents, dispersants, etc. are not easy to cross-link film-forming substances to form a film layer. During the drying process of the film layer, small molecules will volatilize, increasing VOC emissions, and large molecules cannot volatilize and remain in the film layer. In the film layer, it affects the corrosion resistance of the film layer

Method used

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  • A kind of anticorrosion type polyurethane water-based coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] S1: Add 30 g of polyether triol (Mn=3000 g / mol) into the reaction flask, stir in vacuum for 2 h, then add 7.5 g of diphenylmethane diisocyanate and 50 ppm of dibutyltin dilaurate (catalyst), Stirring reaction 1 h, obtain polyurethane prepolymer;

[0026] S2: Put 1 g of carboxylated graphene in 100 ml of thionyl chloride and 20 ml of N, N-dimethylformamide solvent, ultrasonically disperse it evenly, and then reflux at 70-80 °C for 2 h; After the reaction is completed, add 10 g of double-terminated amino polyethylene glycol (Mn=3000 g / mol), and continue to stir and reflux for 24 h. After the reaction is completed, filter, wash, and dry to obtain amino-terminated polyether-grafted graphene;

[0027] S3: Add 1 g of the amino-terminated polyether-grafted graphene into 100 ml of tetrahydrofuran, ultrasonically disperse for 4 hours, and add 0.2 ml of triethylamine and 10 g of KH560 (silane coupling agent) under a nitrogen atmosphere, and then Reflux at 50-60 °C for 24 h, then...

Embodiment 2

[0032] S1-S4 is the same as embodiment 1,

[0033] S5 is specifically: transfer 60 parts of polyurethane emulsion into the stirring device, set the stirring speed to 900 r / min, add 2 parts of defoamer and 10 parts of leveling agent in turn, and stir for 20 min; then set the stirring speed to 1100 r / min / min, add 3 parts of film-forming aids and 15 parts of fillers and stir for 20 minutes; finally add 0.8 parts of defoamer, 1 part of leveling agent and 20 parts of water, and stir at 1200r / min for 15 minutes to obtain anti-corrosion polyurethane water-based paint.

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Abstract

This case involves an anti-corrosion polyurethane water-based paint and its preparation method, using amino-terminated graphene and polyurethane prepolymer to synthesize a modified polyurethane emulsion, which is then made into a water-based paint. The present invention effectively solves the problem of uneven dispersion of graphene in polymer emulsions by modifying graphene, and grafts amino-terminated polyether chains on the surface of graphene to make polyurethane prepolymers and amino-terminated graphite Graphene is combined with chemical bonds to form graphene-modified polyurethane emulsion, so that it has certain anti-corrosion properties; at the same time, the polyether chain between graphene and polyurethane segments increases its hydrophilicity and dispersibility, making it easy for various additives to enter into the polyurethane emulsion system to form a water-based polyurethane coating, which greatly improves the strength of the polyurethane coating; water is used as the main solvent, which is environmentally friendly and suitable for coating the interior walls of buildings. The paint film formed after coating has good self- Cleanliness, flat and smooth surface, excellent adhesion, long aging resistance.

Description

technical field [0001] The invention relates to the field of water-based paint, in particular to an anti-corrosion polyurethane water-based paint and a preparation method thereof. Background technique [0002] In recent years, with the introduction of some green environmental protection policies, water-based coatings have attracted more and more attention from researchers and enterprises. Water-based coatings are coatings prepared with water as the main solvent, but the introduction of water also brings a series of problems. The surface tension of water is large, and pigments and fillers cannot be fully dispersed, and water molecules are easy to enter the interior of the matrix and cause corrosion. It is often necessary to add an appropriate amount of additives to improve the performance of water-based coatings. However, additives such as wetting agents, dispersants, etc. are not easy to cross-link film-forming substances to form a film layer. During the drying process of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/08C09D5/08C09D7/20
CPCC09D5/08C09D175/08C09D7/20C08K9/08C08K3/042
Inventor 曹茂盛
Owner 扬州豪扬新型建筑材料有限公司
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