Preparation And Characterization Of Organic-Inorganic Hybrid Coatings

Due to the good film forming, flexibility, adhesion and lower cost of the substrate, organic resins have been major film-forming coating materials. Inorganic materials have features of high strength, stable performance, but shortcomings of fragile, higher cost also existed. In order to obtain high performance or special functional coating, different means were used to combine organic resin with inorganic materials, so as to integrate both advantages and complement each other for acheving the purpose of improving overall performance and introducing new features, and organic-inorganic hybrid paint were studied in this paper. The mutual dispersivity in paint is higher between organic phase and inorganic phase through the use of particular style of combining chemical bonds between the different phases with physical forces. The capability of mutual force becomes stronger. Organic-inorganic hybrid paint is special products which possess the function of two different characterial components. Their performances integrate the character of inorganic materials and organic polymers. Organic-inorganic hybrid paint is the direction of preparing and developing of new paint.In this paper, sol-gel method was applied to prepare silica sol modified with coupling agents, simultaneously to prepare organic-inorganic hybrid water paint,organic-inorganic epoxy thermal curing paint and organic-inorganic hybrid photocurable paint, using tetraethyl orthosilicate (TEOS) as inorganic phase precursor,γ-glycidoxyproyltrimethoxysilane (KH560),γ-aminopropyltriethoxysilane (KH550),γ-methacryloyloxypropyltrimethoxysilane (KH570) as coupling agents respectively. All kinds of means, such as FT-IR,TG,wrapping angle,polarization curve and AC impedance and so on , were adopted to study the performance of different prepared paint.Through research found that under the catalysis of hydrochloric acid, use tetraethyl orthosilicate as raw materials, excellent modified silicon dioxide sol was prepared in the control of pH value of reactional system, the amount of ethanol, water and various coupling agents and temperature. After the prepared paint cured, all performance analysises showed that interpenetrating network structure was formed, obvious phase interface was not exist, chemical bond and hydrogen bond were existed between inorganic phase and organic phase. The mechanical properties tests showed that the mechanical properties of coating, such as adhesion, hardness, impact resistance, flexibility and so on, are in line with the level of practical application. Wrapping angle test and thermogravimetric analysis showed that coatings have the ability of higher water repellence and heat resistance. The chemical solvent resistant tests showed that the anticorrosion of coatings, such as acid, alkali, gasoline, distilled water and 3.5% NaCl solution achieved the level of actual use. The polarization curve and AC impedance tests showed that the anticorrosion of coatings was good.