Method for producing high-purity micro-silica plastics anti-block agent
A technology of micropowder silica gel and production method, which is applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of large particle size of anti-blocking agent, complicated process of anti-blocking agent, unsuitability for high-grade plastic film production and use, etc. Achieve the effect of small particle size, reduce the number of fish eyes, and reduce product cost
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Embodiment 1
[0024] 5PPM iron content, 10% concentration of water glass 5M 3 , into the reactor. Slowly add dilute sulfuric acid with a concentration of 25%-35% into the reactor at a speed of 3 cubic meters per hour under stirring conditions, and continuously test the pH value of the reactant in the reactor during the addition of sulfuric acid until the pH value of the reactant in the reactor = 1, stop adding sulfuric acid. Stirring was continued for about one hour, and the pH value in the kettle was kept to be monitored and maintained at =1. At this time, the reactant in the kettle is sodium sulfate Na 2 SO 4 Aqueous solution and silicic acid H 4 SiO 4 . The silicic acid in it is colloidal. Wash the above-mentioned reactant with pure water with a conductivity of 25 μs / cm to remove the sodium sulfate therein, and it is qualified if the conductivity is less than 40 μs / cm. After washing, the mixture of silicic acid colloid and water is obtained, and most of the water is removed by ce...
Embodiment 2
[0031] Iron content 5PPM, 10% water glass 10M 3 , into the reactor. Slowly add dilute sulfuric acid with a concentration of 25-35% into the reactor at a rate of 3 cubic meters per hour under stirring conditions, and continuously test the pH value of the reactant in the reactor until the pH value of the reactant in the reactor is 1 When, stop adding sulfuric acid. Stirring was continued for about one hour, and the pH value in the kettle was kept to be monitored and maintained at =1. At this time, the reactant in the kettle is sodium sulfate Na 2 SO 4 Aqueous solution and silicic acid H 4 SiO 4 . The silicic acid in it is colloidal. Wash the above-mentioned reactant with pure water with a conductivity of 30 μs / cm to remove the sodium sulfate therein, and it is qualified if the conductivity reaches 35 μs / cm. After washing, the mixture of silicic acid colloid and water is obtained, and most of the water is removed by centrifugation, so that the silicic acid content reaches...
Embodiment 3
[0033] Iron content 5PPM, water glass 8M with a concentration of 10% 3 , into the reactor. Slowly add dilute sulfuric acid with a concentration of 25-35% into the reactor at a rate of 3 cubic meters per hour under stirring conditions, and continuously test the pH value of the reactant in the reactor until the pH value of the reactant in the reactor is 1 When, stop adding sulfuric acid. Stirring was continued for about one hour, and the pH value in the kettle was kept to be monitored and maintained at =1. At this time, the reactant in the kettle is sodium sulfate Na 2 SO 4 Aqueous solution and silicic acid H 4 SiO 4. The silicic acid in it is colloidal. Wash the above-mentioned reactant with pure water with a conductivity of 40 μs / cm to remove sodium sulfate therein, and it is qualified if the conductivity reaches 35 μs / cm. After washing, the mixture of silicic acid colloid and water is obtained, and most of the water is removed by centrifugation, so that the silicic ac...
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