Preparation method of precipitated calcium carbonate special for pvc anti stone impact coating
A technology of precipitated calcium carbonate and coatings, applied in the direction of calcium carbonate/strontium/barium, coatings, etc., can solve the problems of unfavorable moisture control, difficulty in filling high-grade PVC anti-stone chip coatings, easy moisture absorption of products, etc., to achieve Inhibition of solvation, simple and feasible method, and low hygroscopicity
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Embodiment 1
[0038] Dilute the milk of lime that has been refined and aged for 48 hours, adjust the specific gravity to 1.060, control the temperature at 20.0°C, and then transport it to the bubbling carbonization tower, and pass it into the purified and cooled kiln gas for carbonation reaction. The kiln gas flow rate is 9m 3 / h, the volume content of carbon dioxide is 33%, when the pH of the reaction solution drops below 7.0, the carbonation reaction is completed, and the specific surface area of cooked pulp is 24.8m 2 / g;
[0039] Prepare a compound surface treatment agent of 3.50% (calculated on a dry basis of calcium carbonate): among them, the fatty acid is selected from stearic acid: arachidic acid = 1:1, and its consumption is 60% of the total surface treatment agent, and the consumption of castor oil is the surface treatment 10% of the total amount of agent, the amount of epoxy soybean oil is 30% of the total amount of surface treatment agent, the temperature of hot water is 90 ...
Embodiment 2
[0043] Dilute the milk of lime that has been refined and aged for 48 hours, adjust the specific gravity to 1.070, control the temperature at 25°C, and then transport it to the bubbling carbonization tower with stirring; pass it into the purified and cooled kiln gas for carbonation reaction, The kiln gas flow rate is 10m 3 / h, the volume content of carbon dioxide is 33%, when the pH of the reaction solution drops below 7.0, the carbonation reaction is completed, and the specific surface area of cooked pulp is 21.3m 2 / g;
[0044]Prepare the compound surface treatment agent of 3.0% (calcium carbonate dry basis): wherein fatty acid selects stearic acid for use: behenic acid=1:3, and its consumption is 80% of surface treatment agent total amount, castor oil consumption is surface 12% of the total amount of treatment agent, the amount of epoxidized soybean oil is 8% of the total amount of surface treatment agent, the temperature of hot water is 90 ℃, and the consumption of sodiu...
Embodiment 3
[0048] Dilute the milk of lime that has been refined and aged for 48 hours, adjust the specific gravity to 1.055, control the temperature at 20°C, and then transport it to the bubbling carbonization tower with stirring; pass it into the purified and cooled kiln gas for carbonation reaction, The kiln gas flow rate is 10m 3 / h, the volume content of carbon dioxide is 35%, when the pH of the reaction solution drops below 7.0, the carbonation reaction is completed, and the specific surface area of cooked pulp is 31.7m 2 / g;
[0049] Prepare the composite surface treatment agent of 4.5% (in calcium carbonate dry basis): wherein fatty acid is selected stearic acid for use, and its consumption is 70% of surface treatment agent total amount, castor oil consumption is 20% of surface treatment agent total amount, The consumption of epoxy soybean oil is 10% of the total amount of surface treatment agent, the temperature of hot water is 95°C, and the consumption of sodium hydroxide is ...
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