Preparation method of extinction powder special for elastic paint
A technology of matting powder and elastic paint, applied in chemical instruments and methods, silica, inorganic chemistry, etc., can solve problems such as difficult to improve, poor transparency, small pore volume, etc., to improve pore structure and increase collision frequency , The effect of increasing the pore volume
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Embodiment 1
[0021] In a 5000L stirred reactor, add 1000L water and 480L sodium silicate solution and stir evenly, raise the temperature to 45°C, and add 30% sulfuric acid dropwise to the solution at a speed of 4L / min under stirring until the pH value is 6.0-7.0, stir for 30 minutes, add 20% ammonia water to adjust the pH value to 8-9, age for 50 minutes, continue to heat up to 90°C, at this temperature, add sodium silicate with a flow rate of 0.55L / min into the reaction kettle at the same time 820L and sulfuric acid, and keep the pH value of the solution at 8-9, continue to age for 50 minutes, continue to add acid until the pH value is 4-5 after the reaction, filter and wash the reaction slurry to obtain a silica filter cake, and re-beaten To form a suspension solution, add polydimethylsiloxane and acrylic acid block polymer to it, then dry, pulverize and classify.
Embodiment 2
[0023] In a 5000L stirred reactor, add 1000L water and 500L sodium silicate solution and stir evenly, raise the temperature to 40°C, and add 30% sulfuric acid dropwise to the solution at a speed of 5L / min under stirring until the pH value is 6.0-7.0, stir for 30 minutes, add 20% ammonia water to adjust the pH value to 8-9, age for 50 minutes, continue to heat up to 85°C, at this temperature, add sodium silicate with a flow rate of 0.55L / min into the reaction kettle at the same time 750L and sulfuric acid, and keep the pH value of the solution at 8-9, continue to age for 50min, continue to add acid until the pH value is 4-5 after the reaction, filter and wash the reaction slurry to obtain a silica filter cake, and re-beaten To form a suspension solution, add polydimethylsiloxane and acrylic acid block polymer to it, then dry, pulverize and classify.
Embodiment 3
[0025] In a 5000L stirred reactor, add 1000L water and 400L sodium silicate solution and stir evenly, raise the temperature to 45°C, add 25% sulfuric acid dropwise to the solution at a speed of 4L / min under stirring until the pH value is 6.0-7.0, stir for 30 minutes, add 20% ammonia water to adjust the pH value to 8-9, age for 50 minutes, continue to heat up to 100°C, at this temperature, add sodium silicate with a flow rate of 0.55L / min into the reaction kettle at the same time 1000L and sulfuric acid, and keep the pH value of the solution at 8-9, continue to age for 50 minutes, continue to add acid until the pH value is 4-5 after the reaction, filter and wash the reaction slurry to obtain a silica filter cake, and re-beaten To form a suspension solution, add polydimethylsiloxane and acrylic acid block polymer to it, then dry, pulverize and classify.
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