Colloidal silica preparation method

Inorganic polymer coating of silica sol preparation process no special difference between the other coating, but should be slowly added Colloidal silica, or paint will change in nature. You can take off work the following preparation: the film-forming additives (often made with the use of zinc oxide, silicic acid ester, butyl acetate, methyl-sodium) added to the reaction kettle, add water, mixing quantitative and turn adding surfactant (benzene sulfonate), thickeners (hydroxyethyl cellulose, CMC, etc.), dispersant (sodium side door), defoamer (TBP) and other additives; and then slowly adding Colloidal silica, pigment, color paste. Sanding machine or a colloid mill with a small study, need to join the middle points can be coarse aggregates. PH value of the coating needs of 8.510 between. Colloidal silica  inorganic polymer coating formulation: greater shrinkage during sol film, coating easy to crack, to overcome this drawback, in addition to adding the inorganic fibrous filler coating, while also adding water-soluble emulsion as a supplement to membrane material, so that organic matter fill in "-Si-O-Si-", network structure to reduce the film shrinkage and expansion and contraction caused by temperature changes. Into a coating that has excellent weather resistance of inorganic, organic coatings, as they have excellent decoration, stability and construction of the organic compound coating. This test can usually filter: in the inorganic material film accounted for 50% to 90%, 10% and 50% organic matter. When added in with the polyvinyl acetate emulsion; to add external benzene - acrylic emulsion, the first use of rutile titanium dioxide, the volume concentration of 5%, and mixed with a lot of pigment, the total volume concentration of 60% 70% speculation

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Polyacrylamide using the methods and precautions

you can through a small test to determine the best model, and the optimal dosage of the product. 2, the product prepared as 0.1% (mean solid content) concentration of aqueous solution of neutral salt to the water not suitable. 3, dissolved in water, it will even be thrown into the mix this product in water, appropriate heating (<60 ℃) can accelerate into a solution. 4, the solid product with polypropylene woven bag lined with plastic bag, 25kg, colloid plastic drum lined with plastic bag, barrel, 50kg or 200kg. 5, the products are hygroscopic, should be sealed and stored in a cool dry place, the temperature is lower than 35 ℃. 6, the solid product to avoid the spread on the ground to prevent moisture absorption after the product to become slippery. 7, the preparation of PAM aqueous solution should be in the enamel, galvanized, aluminum or plastic drums for, not in the preparation and storage of iron within the container 8, dissolved, should pay attention to the product evenly and slowly added with stirring and heating measures dissolver, solid knot should be avoided, the solution prepared in the appropriate temperature, and should avoid prolonged drastic mechanical shear is recommended agitator 60-200 turn / min, otherwise it will lead to polymer degradation, affect the results . 9, PAM aqueous solution should be done now with the existing, when dissolved in liquid for a long time to place, its performance will depend on the circumstances of decreased water quality 10, adding flocculant in the suspension solution, if heated long to stir, it will undermine the already formed floc physicochemical properties of polyacrylamide

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Colloidal Silica’sMethod of preparation

Inorganic polymer coating of silica sol preparation process no special difference between the other coating, but should be slowly added silica, or paint will change in nature. You can take off work the following preparation: the film-forming additives (often made with the use of zinc oxide, silicic acid ester, butyl acetate, methyl-sodium) added to the reaction kettle, add water, mixing quantitative and turn adding surfactant (benzene sulfonate), thickeners (hydroxyethyl cellulose, CMC, etc.), dispersant (sodium side door), defoamer (TBP) and other additives; and then slowly adding silica sol, pigment, color paste. Sanding machine or a colloid mill with a small study, need to join the middle points can be coarse aggregates. PH value of the coating needs of 8.510 between. Silica inorganic polymer coating formulation: greater shrinkage during sol film, coating easy to crack, to overcome this drawback, in addition to adding the inorganic fibrous filler coating, while also adding water-soluble emulsion as a supplement to membrane material, so that organic matter fill in "-Si-O-Si-", network structure to reduce the film shrinkage and expansion and contraction caused by temperature changes. Into a coating that has excellent weather resistance of inorganic, organic coatings, as they have excellent decoration, stability and construction of the organic compound coating. This test can usually filter: in the inorganic material film accounted for 50% to 90%, 10% and 50% organic matter. When added in with the polyvinyl acetate emulsion; to add external benzene - acrylic emulsion, the first use of rutile titanium dioxide, the volume concentration of 5%, and mixed with a lot of pigment, the total volume concentration of 60% 70% speculation.

Read more :http://www.chemical-materials.net/plus/search/index.asp