Self-repairing stone-like coating and preparation method thereof
A real stone paint and self-repairing technology, applied in antifouling/underwater coatings, polyurea/polyurethane coatings, coatings, etc., can solve problems such as paint film cracks, affecting the decorative effect of exterior wall coatings and functional service life, etc. Achieve the effect of strong self-healing ability, low self-healing rate and good comprehensive performance advantages
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[0027] like figure 1 as shown, figure 1 It is the flow chart of the preparation method of described self-repairing real stone paint; the preparation method of self-repairing real stone paint of the present invention comprises steps:
[0028] S1, dissolving a certain proportion of thickener in deionized water;
[0029] S2, water-based polyurethane emulsion containing disulfide bonds and acylhydrazone bonds, emulsifiers, film-forming aids, antifreeze agents, and defoamers are mixed in a container containing the solution obtained in step S1 according to the proportion, and stirred and dispersed for 30 minutes;
[0030] S3, adding natural colored sand to the solution obtained in step S2 and mixing, stirring evenly to obtain real stone paint.
[0031] Preferably, by weight, the raw material components are set as follows: 80-120 parts of the water-based polyurethane emulsion containing disulfide bonds and acylhydrazone bonds, 300-400 parts of the colored sand, 3-5 parts of the non...
Embodiment 1
[0054] The preparation of the described water-based polyurethane emulsion containing disulfide bond and acylhydrazone bond:
[0055] A1, add 100 parts of polytetrahydrofuran diol into the reactor, and perform vacuum dehydration at 120°C for 2 hours;
[0056] A2, in N 2 Under protection, lower the temperature to 80°C, add 44.5 parts of isophorone diisocyanate and 0.03 parts of dibutyltin dilaurate, react at 90°C for 3 hours, and adjust the viscosity with 40 parts of N-methylpyrrolidone;
[0057] A3, lower the temperature to 70°C, add 12 parts of sodium N-(2-aminoethyl)-2-aminoethanesulfonate and react for 3 hours
[0058] A4, cool down to 50°C and add 10 parts of 4,4′-diaminodiphenylsulfide and 5 parts of quinone oxime hydrazone to react for 2 hours;
[0059] A5, lower the temperature to 30°C, transfer to an emulsification tank, add 300 parts of deionized water and disperse at high speed for 30 minutes.
[0060] A6, finally vacuum desolvation to prepare water-based polyureth...
Embodiment 2
[0065] The preparation of the described water-based polyurethane emulsion containing disulfide bond and acylhydrazone bond:
[0066] A1, add 100 parts of polycaprolactone diol into the reactor, and perform vacuum dehydration at 120°C for 2 hours;
[0067] A2, in N 2 Under protection, lower the temperature to 70°C, add 50 parts of 4,4-diphenylmethane diisocyanate (MDI) and 0.02 parts of stannous octoate, react at 85°C for 3 hours, and adjust the viscosity with 40 parts of 20ml dioxane;
[0068] A3, cool down to 70°C, add 10 parts of sodium ethylenediaminoethanesulfonate to react for 3 hours;
[0069] A4, heat up to 50°C, add 12 parts of 4,4'-dihydroxydiphenyl sulfide and 6 parts of diflufenzole, and react for 3 hours;
[0070] A5, lower the temperature to 30°C, transfer to an emulsification tank, add 300 parts of deionized water and disperse at high speed for 30 minutes.
[0071] A6, finally vacuum desolvation to prepare water-based polyurethane emulsion containing disulfide...
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