Nano hollow silica dioxide micro-sphere/polyurethane composite aqueous paint and preparation method thereof

Abstract

The invention belongs to the technical filed of water paint, which particularly relates to nanometer hollow silica sphere / polyurethane compound water paint and the process for preparation thereof. The water compound paint is chemically compounded by hollow SiO2 sphere, whose dimension is 50-250 nanometers, isocyanate terminated polyurethane prepolymer, catalyst and other auxiliary agents. Indoor temperature storage stability of the compound water paint is excellent, nanometer hollow SiO2 sphere and water polyurethane have excellent compatibility, hardness and compatibility of the water compound coating layer are greatly improved, and fire-resisting property and ultraviolet resistant performance are excellent. The process for preparation of the invention has the advantages of convenient and simple technique, high film coating quality, low production cost and extensive application prospect and the like, which has no pollution to environment, the water paint is a new generation environmental-friendly high-performance chemical product, which can be applied in the fields such as automobile coating, wood coating, construction, office furniture, leather, textile finishing, pigment printing and mechanical equipment.

Description

technical field [0001] The invention belongs to the technical field of water-based paint preparation technology, and in particular relates to a nano hollow silica microsphere / polyurethane composite water-based paint and a preparation method thereof. Background technique [0002] Because water-based polyurethane uses water as the dispersion medium, it not only has some important performance characteristics of solvent-based polyurethane, but also has the advantages of low volatile organic compounds, non-toxic, non-flammable, non-polluting, energy-saving, safe and reliable, etc., so in recent years to develop rapidly. However, the waterborne polyurethane coating films currently prepared need to be further developed in terms of water resistance, solvent resistance and physical and mechanical properties. In order to improve and enhance the comprehensive performance of waterborne polyurethane coatings and expand its application range, it is necessary to carry out compound modific...

AI Technical Summary

Problems solved by technology

The nano-silica emulsion uses 5-15% surfactant, which will inevitably seriously affect the performance of the water-based composite coating, and the reaction steps are many, the cost is high, and the application is limited.

Chinese patent CN101007911A has reported another kind of water-based paint and its manufacture method, and silicon dioxide can reach 10-18% of the total weight of water-based paint in this emulsion, and the product has adopted very trace dispersant (<0.1%), effectively avoids The impact of high additive content on product performance, but the suspension stability and rheological properties of the product are poor

Especially silica hollow microspheres, due to their large specific surface area, low density, high thermal and mechanical stability, etc., if they are compounded and modified with water-based polyurethane coatings, problems such as dispersibility, density and coating will inevitably be brought. New breakthroughs have come, and there are no public literature reports and patent applications about hollow silica microspheres / waterborne polyurethane organic-inorganic composite waterborne coatings and their preparation methods at home and abroad.

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