31results about How to "Eliminates washing steps" patented technology

The invention discloses an impurity-free Preyssler-type heteropoly acid and a preparation method thereof, belonging to the field of heteropoly acid preparation. The preparation method of the Preyssler type heteropolyacid comprises the following steps: adding phosphoric acid to the aqueous solution of sodium tungstate, and then reacting at 100-140° C. in the reactor for 12-24 hours, and the molar ratio of phosphoric acid to sodium tungstate is 4- 10:1; after cooling to room temperature, add ammonium chloride for suction filtration; wash with methanol solution and recrystallize; add a small amount of sorbic acid and ion-exchange the heteropolyacid solution; finally, vacuum dry the eluent. The preparation method of the impurity-free Preyssler-type heteropolyacid does not add any potassium ions, and at the same time saves the potassium acetate washing step, avoids the introduction of potassium ions into the product, and improves the yield and purity of the finished heteropolyacid, In addition, the preparation method has the advantages of simple process and convenient operation, and is suitable for industrialized large-scale production.

The invention relates to a method for preparing a white carbon black / solution-polymerized styrene-butadiene rubber nano composite material. In the invention, nano white carbon black powder and silanecoupling agent are fully mixed and condensation reaction is carried out at high temperature, organic modified nano white carbon black powder is obtained and added into solution-polymerized styrene-butadiene; the mixture of the white carbon black powder and solution-polymerized styrene-butadiene is stirred and removes solvent and then dried, thus obtaining the silicon dioxide / solution-polymerized styrene-butadiene rubber nano composite material prepared by co-polymerization. The invention expands the range of methods for preparing the nano composite material with solution composition. The adopted method using the organically modified white carbon black is simple and easy for operation and the solution composite technique is fast and convenient with low cost. The prepared co-polymerized rubber can be taken as master batch and is added with the white carbon black or added with other fillings for preparing novel nano composite material. The physical and mechanical properties and dynamic mechanical property of the rubber prepared by the method are better than the properties of coordinative amount of filling prepared by mechanical mixing method and the composition speed of subsequent fillings of the rubber prepared by the method is faster than that prepared by the mechanical method.

The invention discloses a compound of high-whiteness clay and a preparation method thereof. The preparation method is as follows: firstly adding titanium tetrachloride solution into clay slurry to dissolve out the developing elements in the clay in the form of ions; secondly, adding phosphoric acid water solution to load the phosphate precipitation and titanium phosphate precipitation of the developing elements on the surface of the clay; and finally adding silicate solution or aluminate solution to ensure generated silica or alumina to compound the clay once again to obtain the high-whiteness clay. The invention has low cost, simple operation and less environmental pollution.