Preparation method for functional power of solar energy absorbed composite coating layer based on chromium-aluminum-manganese oxide
A technology of solar energy absorption and functional powder, which is applied in the field of solar thermal utilization, can solve the problems of inability to heat resistance and low emissivity, and achieve the effects of good solar selective absorption performance and good fluidity
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[0016] The present invention is a method for preparing a medium-high temperature solar energy absorbing composite coating based on chromium-aluminum-manganese oxide functional powder. %, manganese chloride tetrahydrate 10%; the binder is 1053 silicone resin, the dispersant is glycerol, and the ratio is mixed raw materials: binder: dispersant=500:10:2;
[0017] Described method comprises the steps:
[0018] Raw material mixing step Mix the mixed raw material, binder, dispersant, and deionized water in a ratio of 500:10:2:1000 and continue stirring for 40-60 minutes to form a uniform slurry;
[0019] Put the slurry into the colloid mill for wet grinding and mixing, fully disperse the components in the slurry, and stir for 1 hour;
[0020] The drying step adopts the spray drying method to prepare the functional powder. The temperature of the air inlet of the spray drying tower is set at 160-170°C, the temperature of the air outlet is set at 40-60°C, the speed of the feeding pump...
Embodiment 1
[0024] Get 500g of mixed raw materials, the mass ratio is 55% of chromium oxide, 35% of aluminum oxide, and 10% of manganese chloride tetrahydrate.
[0025] Take 10g of 1053 silicone resin, 2-3ml of glycerin, 1000ml of deionized water and fully mix and stir for 40 minutes.
[0026] Put the slurry into the colloid mill for wet grinding and mixing, fully disperse the components in the slurry, and stir for 1 hour;
[0027] The drying step adopts the spray drying method to prepare the functional powder. The temperature of the air inlet of the spray drying tower is set to 160°C, the temperature of the air outlet is set to 40°C, the speed of the feeding pump is set to 800r / min, and the speed of the atomizer is set to 17000r / min; Send the slurry into the spray drying tower to prepare the functional powder; the particle size of the powder is not more than 50 μm;
[0028] The step of preparing the permeable membrane to adjust the acid adopts the sol-gel method to prepare the tin oxide...
Embodiment 2
[0031] Get 500g of mixed raw materials, the mass ratio is 55% of chromium oxide, 35% of aluminum oxide, and 10% of manganese chloride tetrahydrate.
[0032] Take 10g of 1053 silicone resin, 2-3ml of glycerol, 1000ml of deionized water and fully mix and stir with the mixed raw materials for 50 minutes.
[0033] Put the slurry into the colloid mill for wet grinding and mixing, fully disperse the components in the slurry, and stir for 1 hour;
[0034] The drying step adopts the spray drying method to prepare the functional powder. The temperature of the air inlet of the spray drying tower is set to 165°C, the temperature of the air outlet is set to 50°C, the speed of the feeding pump is set to 800r / min, and the speed of the atomizer is set to 18500r / min; Send the slurry into the spray drying tower to prepare the functional powder; the particle size of the powder is not more than 50 μm;
[0035] The step of preparing the permeable membrane to adjust the acid adopts the sol-gel me...
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