Method for preparing radiation cooling coating
A technology of heat-dissipating coatings and aqueous solutions, applied in the direction of polyester coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc., can solve problems such as unsatisfactory use effects and weak surface adhesion, and achieve excellent protection and decoration functions. Simple process and good self-cleaning effect
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Embodiment 1
[0023] A preparation method of a radiation-cooled heat-dissipating coating in this embodiment comprises the following steps:
[0024] (1) Preparation of zinc salt aqueous solution: mix zinc salt with organic surfactant to make 0.5mol aqueous solution, wherein zinc salt includes Zn(NO 3 ) 2 ·6H 2 O, ZnCl and zinc acetate, organic surfactants include triethanolamine, hexamethylenetetramine.
[0025] (2) Adjust the pH value: drop NaOH aqueous solution into the zinc salt solution until the pH reaches 8; the concentration of the zinc salt solution is 0.5 mol, and the concentration of the NaOH solution is 0.5 mol.
[0026] (3) Preparation of flower-shaped zinc oxide: heating the pH-adjusted zinc salt solution to 70°C, reacting for 60 minutes, washing and drying to obtain flower-shaped zinc oxide powder.
[0027] (4) Make heat-dissipating paint: disperse the above-prepared zinc oxide powder into alkyd resin at a ratio of 20%, stir, grind, and react.
Embodiment 2
[0029] A preparation method of a radiation-cooled heat-dissipating coating in this embodiment comprises the following steps:
[0030] (1) Preparation of zinc salt aqueous solution: mix zinc salt with organic surfactant to make 1.5mol aqueous solution, wherein zinc salt includes Zn(NO 3 ) 2 ·6H 2 O, ZnCl and zinc acetate, organic surfactants include triethanolamine, hexamethylenetetramine.
[0031] (2) Adjust the pH value: drop KOH aqueous solution into the zinc salt aqueous solution until the pH reaches 9; the concentration of the zinc salt aqueous solution is 1.5 mol, and the concentration of the KOH aqueous solution is 1.5 mol.
[0032] (3) Preparation of flower-shaped zinc oxide: heating the pH-adjusted zinc salt solution to 85°C, reacting for 40 minutes, washing and drying to obtain flower-shaped zinc oxide powder.
[0033] (4) Make heat-dissipating paint: disperse the above-prepared zinc oxide powder into amino resin at a ratio of 15%, stir, grind, and react.
[0034]...
Embodiment 3
[0038] A preparation method of a radiation-cooled heat-dissipating coating in this embodiment comprises the following steps:
[0039] (1) Preparation of zinc salt aqueous solution: mix zinc salt with organic surfactant to make 2.0mol aqueous solution, wherein zinc salt includes Zn(NO 3 ) 2 ·6H 2 O, ZnCl and zinc acetate, organic surfactants include triethanolamine, hexamethylenetetramine.
[0040] (2) Adjusting the pH value: drop the aqueous ammonia solution into the zinc salt solution until the pH reaches 10; the concentration of the zinc salt solution is 2.0 mol, and the concentration of the ammonia solution is 2.0 mol.
[0041] (3) Preparation of flower-shaped zinc oxide: heating the pH-adjusted zinc salt solution to 95°C, reacting for 10 minutes, washing and drying to obtain flower-shaped zinc oxide powder.
[0042] (4) Make heat-dissipating paint: disperse the above-prepared zinc oxide powder into acrylic resin at a ratio of 1%, stir, grind, and react.
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