Preparation method and application of cationic water-based siloxane oligomer
A siloxane oligomer, cationic technology, used in coatings and other directions, can solve the problems of low construction solids, long curing time, containing restricted organic free isocyanates, etc. Short-term, enhanced three-dimensional effect
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[0027] A kind of preparation method of cationic waterborne siloxane oligomer, comprises the steps:
[0028] Step 1: Add 35-50 parts of binary siloxane and 10-15 parts of ternary siloxane to 30-35 parts of aminopropyltriethoxysilane according to the ratio of parts by mass;
[0029] Step 2: Add 25-30 parts of a mixture of water and monobasic acid catalyst at a temperature of 20-60°C;
[0030] Step 3: Stir and react at 20-60°C for ≥4 hours under nitrogen protection;
[0031] Step 4: add water to dilute, vacuum or heat up to remove alcohol solvent, filter and pack to obtain cationic water-based siloxane oligomer.
[0032] The binary siloxane and ternary siloxane are methyltrimethoxysilane, phenyltrimethoxysilane, methyltriethoxysilane, phenyltriethoxysilane, dimethyldimethoxy One or more combinations of base silane, diphenyldimethoxysilane, dimethyldiethoxysilane, diphenyldiethoxysilane, benzyltriethoxysilane.
[0033] The monobasic acid catalyst is formic acid, acetic acid, hy...
Embodiment 1
[0036]The application of cationic water-based siloxane oligomers in water-soluble color wipes is as follows: add 4 parts of formic acid and 5 parts of ethanol to 40 parts of cationic water-based siloxane oligomers according to the ratio of parts by mass, and stir evenly , add 0.1 part of defoamer 024, stir for 5 minutes, then add 4-7.5 parts of alcohol-soluble dye, stir evenly, finally add 43.4-46.9 parts of deionized water, stir well, filter and pack through a 400-mesh filter to obtain water-soluble Wipe the color agent; clean the wood surface, rub the wood surface with a rag dipped in the toner until the required color is met; take a clean rag and wipe the painted surface until the texture is clear and the color is uniform; place It can be dried in 2-3 hours; after drying, the stained wood can be further coated with varnish on the surface, or used directly, which can inhibit the swelling of tendons.
[0037]
[0038]
Embodiment 2
[0040] The application of cationic water-based siloxane oligomer in metal surface decorative white baking paint is as follows: add 4 parts of formic acid and defoamer to 24 parts of cationic water-based siloxane oligomer in proportion by mass parts 024 0.2 parts, 20 parts of titanium dioxide, 1 part of dispersant are mixed and dispersed to make the particle size less than 2 microns, then add 8 parts of methyl etherified amino resin, 24 parts of cationic water-based siloxane oligomer, and 5 parts of ethanol After mixing evenly, add 13.8 parts of deionized water, and continue to stir evenly to obtain metal surface decorative white baking paint; spray it on a clean metal surface, the wet film thickness is 40-50 microns, and bake at 140°C for 30 minutes to obtain High gloss, high hardness white decorative coating.
[0041]
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