Nano silicon dioxide-water-based alkyd hybrid resin and preparation method thereof
A technology of nano-silica and water-based alkyd, which is applied in coatings and other directions, and can solve problems such as difficulty in nano-powder dispersion
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Embodiment 1
[0031] The preparation method of embodiment 1 comprises:
[0032] S1, the step of preparing modified silica sol, comprises first using acidic catalyst hydrochloric acid to SiO 2 The pH value of 70 parts of aqueous silica sol (particle size is 10nm) with a content of 20% is adjusted to a range of 2, and then 5 parts of deionized water and 25 parts of KH-560 are added thereto, and the reaction is stirred for 6 hours to obtain a modified silica sol, and then Use triethylamine to adjust the pH value of the modified silica sol to 6;
[0033] S2. Alkyd resin surface modification, including: take 99 parts of water-based alkyd resin (the solid content of the water-based alkyd resin is 65%, and the acid value is 40mgKOH / g), under the protection of nitrogen, the temperature is raised to 120-140°C , then add 1 part of KH-560 and 0.01 part of tetrabutylammonium chloride, stir for 1 hour, cool down to room temperature, add alkali to adjust the pH value to 6;
[0034] S3. Preparation of n...
Embodiment 2
[0035] The preparation method of embodiment 2 comprises:
[0036] S1, the step of preparing modified silica sol, comprises first using acidic catalyst nitric acid to SiO 2 The pH value of 60 parts of aqueous silica sol (particle size: 50nm) with a content of 30% was adjusted to a range of 5, and then 7 parts of deionized water and 33 parts of KH-560 were added thereto, stirred and reacted for 8 hours to obtain a modified silica sol, and then Use ammonia water to adjust the pH value of the modified silica sol to 7;
[0037] S2. Alkyd resin surface modification, including: take 98.5 parts of water-based alkyd resin (the solid content of the water-based alkyd resin is 85%, and the acid value is 60mgKOH / g), under the protection of nitrogen, the temperature is raised to 120-140°C , followed by adding 1.5 parts of KH-560 and 0.02 parts of dodecyltrimethylammonium chloride, stirring for 2 hours, cooling to room temperature, adding alkali to adjust the pH value to 7;
[0038] S3. Pr...
Embodiment 3
[0039] The preparation method of embodiment 3 comprises:
[0040] S1, the step of preparing modified silica sol, comprises first using acidic catalyst formic acid to SiO 2 The pH value of 50 parts of aqueous silica sol (particle size is 100nm) with a content of 50% is adjusted to a range of 6, and then 6 parts of deionized water and 44 parts of KH-560 are added thereto, stirred and reacted for 10 hours to obtain a modified silica sol, and then Use N,N-dimethylethanolamine to adjust the pH value of the modified silica sol to 7;
[0041] S2, alkyd resin surface modification, including: take 99.5 parts of water-based alkyd resin (the solid content of the water-based alkyd resin is 90%, and the acid value is 80mgKOH / g), under the protection of nitrogen, the temperature is raised to 120-140°C , followed by adding 0.5 parts of KH-560 and 0.03 parts of tetrabutylammonium chloride, stirring for 3 hours, after cooling down to room temperature, adding N,N-dimethylethanolamine to adjust...
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