Preparation method of light-weight, hydrophobic, heat-retaining and fire-resistant methyl azo color airgel coating
A technology of methyl azo and airgel, applied in the direction of fireproof coatings, coatings, etc., can solve the problems of slow drying speed, unacceptable, cracking of the base surface, etc., and achieve improved quality, saturated and bright colors, and high porosity Effect
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[0028] The preparation method of the methyl azo color airgel coating of lightweight hydrophobic heat preservation and fireproof comprises the following steps:
[0029] 1) Mix ethyl orthosilicate with deionized aqueous solution of ethanol, adjust the pH value to 3-5 with an acidic catalyst, carry out hydrolysis reaction and polycondensation reaction at 60-70°C to obtain silica sol;
[0030] 2) Ultrasonic waves are used to uniformly disperse the mixed slurry of methyl azo dyes and silica sol of different colors; and then catalyze it with a basic catalyst until the pH value is 7-8, and leave it to age at room temperature to obtain formazan Azo-based silica gel;
[0031] 3) using ethanol to perform solvent replacement on the methylazo silica gel obtained in step 2), respectively, to obtain an alcohol gel of methyl azo silica;
[0032] 4) Using a mixed solution of trimethylchlorosilane and cyclohexane to carry out surface modification to the methylazo silica alcohol gel obtained i...
Embodiment 1
[0043] Seefigure 1 A method for preparing light hydrophobic, heat-retaining and fire-resistant methylazo color airgel coatings with tetraethyl orthosilicate and methylazo dyes as raw materials under normal pressure, comprising the following steps:
[0044] 1) Weigh 100 mL of tetraethyl orthosilicate, add 130 mL of absolute ethanol and 70 mL of deionized water, use 5 mL of 2 mol / L hydrochloric acid as a catalyst, and adjust the pH to 3.4. The mixed solution was reacted at 60°C for 90 minutes, and the silica sol became a white transparent liquid after the reaction.
[0045] 2) Add 0.01 g of rose bengal B dye to the silica sol, and use ultrasonic vibration for 15 minutes to obtain methyl azo silica sol. Using 2 mol / L ammonia solution as a basic catalyst, adjust the pH to 7.3 by a sol-gel method to convert methylazo silica sol into methyl azo silica gel.
[0046] 3) The methyl azo silica gel is sealed and aged for 24 hours to be processed. Soak the aged methyl azo silicon dioxid...
Embodiment 2
[0049] See figure 1 A method for preparing light hydrophobic, heat-retaining and fire-resistant methylazo color airgel coatings with tetraethyl orthosilicate and methylazo dyes as raw materials under normal pressure, comprising the following steps:
[0050] 1) Weigh 100 mL of tetraethyl orthosilicate, add 130 mL of absolute ethanol and 70 mL of deionized water, use 5 mL of 2 mol / L hydrochloric acid as a catalyst, and adjust the pH to 3.4. The mixed solution was reacted at 60°C for 90 minutes, and the silica sol became a white transparent liquid after the reaction.
[0051] 2) Add 0.01 g of methylene blue dye to the silica sol, and use ultrasonic vibration for 15 minutes to obtain methyl azo silica sol. Using 2 mol / L ammonia solution as a basic catalyst, adjust the pH to 7.5 by a sol-gel method to convert methylazo silica sol into methyl azo silica gel.
[0052] 3) The methyl azo silica gel is sealed and aged for 24 hours to be processed. Soak the aged methyl azo silicon dio...
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