Modified waterborne epoxy resin/nano SiO2 composite hydrophobic coating and preparation method thereof

Abstract

The invention relates to a modified waterborne epoxy resin / nano SiO2 composite hydrophobic coating and a preparation method. The hydrophobic coating takes amino silicone oil modified waterborne epoxyresin as a base material, and hydrophobic coatings with different hydrophobicity are prepared by simply adjusting the addition amount of fluorinated SiO2 nano powder. The preparation method comprisesfollowing three steps: 1) modifying pretreated nano SiO2 by using 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FAS) to obtain fluorinated nano SiO2, 2) modifying waterborne epoxy resin by using amino silicone oil, and 3), compounding the fluorinated nano SiO2 with the modified waterborne epoxy resin to prepare the hydrophobic coating. According to the preparation method, a bifunctional silane coupling agent is used for modifying the nano SiO2, so that the treated base material has extremely low surface energy and extremely poor wettability. The amino silicon oil can enable the base material to have a certain degree of water resistance. The preparation method is simple in process, the coating has good hydrophobicity and lipophobicity, and the mechanical property is also improved.

Description

technical field [0001] The invention belongs to the technical field of coatings, and more specifically relates to a modified water-based epoxy resin / nano-SiO 2 Composite hydrophobic coating and preparation method thereof. Background technique [0002] Epoxy resin has good corrosion resistance, chemical resistance and solvent resistance, especially good alkali resistance, and has the characteristics of strong adhesion, high hardness and good wear resistance. It has been widely used in military and civil industries. It has been widely used, especially in the application of coatings, 40% of epoxy resins are used as coatings worldwide. Traditional epoxy resins have the problem of low toxicity and volatile solvents in use, which will pollute the environment. With the development of the times, more and more attention has been paid to environmental protection. Strict restrictions on the emission of volatile organic solvents (VOC) have been proposed at home and abroad, and the dev...

AI Technical Summary

Problems solved by technology

At present, high-pollution coatings still occupy a relatively large proportion in my country, especially in the field of industrial coatings, where solvent-based coatings still dominate the world, causing serious harm to the environment and construction personnel.

At present, most of the solvents used for epoxy resin are aromatic hydrocarbons, ketones and alcohol organic solvents, and organic solvents have the disadvantages of high price, volatility and environmental pollution.