Nano-silica dispersion liquid, preparation method thereof, and preparation method of cake

Abstract

The invention discloses nanoscale silicon oxide composite dispersion liquid and a preparation method therefor, belongs to the technical field of nanomaterial preparation, and solves the problems of low stability, high probability of demulsification, non-ideal gel forming state, and high usage amount of gel in the existing nanoscale silicon oxide sol. The nanoscale silicon oxide composite dispersion liquid comprises nanoscale silicon oxide and deionized water, and the nanoscale silicon oxide composite dispersion liquid is colorless transparent liquid, the PH value of the composite dispersion liquid is 9-12, the specific gravity at the temperature of 25 DEG C is 1.07-1.13 g / cm3, and the viscosity at the temperature of 25 DEG C is 1.71-1.78 mPa.S; the preparation method for the nanoscale silicon oxide composite dispersion liquid comprises a step of adding a dispersing agent, a step of adding the nanoscale silicon oxide, a step of adjusting the PH value and a step of adding compatibilizer in sequence; the preparation method for the nanoscale silicon oxide cake material comprises a first-order reaction step, a second-order reaction step, an aging step and a washing step; and the obtained nanoscale silicon oxide cake material comprises nanoscale silicon oxide powder, the solid grain diameter of the nanoscale silicon oxide powder is 1.5-10 nm, and the specific surface area of the nanoscale silicon oxide powder is greater than or equal to 1, 100 m2 / g.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanomaterials, and in particular relates to a nano-silicon oxide dispersion liquid, a preparation method thereof, and a preparation method of a cake Background technique [0002] my country's lead-acid battery production capacity is 280 million kVAh, more than two-thirds of the global total. In recent years, the industry's output has increased at a rate of 20%. At present, lead-acid batteries also have low energy density and power density. , Applicable environmental temperature restrictions and other issues, the development of a new generation of nuclear energy, solar thermal utilization and photovoltaic thermal power generation, wind power technology and equipment, smart grids, plug-in hybrid vehicles, and pure electric vehicles clearly pointed out in the 12th Five-Year Plan, Higher and more stringent requirements are put forward for the quality and service conditions of the lead-acid batter...

AI Technical Summary

Problems solved by technology

[0012] The invention provides a nano-silica dispersion and a preparation method thereof, which solve the problems of poor stability of the existing nano-silica sol, easy demulsification, unsatisfactory gelation state, and high colloid usage; The preparation method of nano-silica cake, which improves the process of preparing nano-silica by precipitation method, by setting the neutralization reaction of inorganic acid and water glass as a multi-stage reaction under different conditions, and using a special washing process at the same time, In this way, the particle size and specific surface area of ​​nano-silicon oxide can be controlled during the preparation process, thereby preparing nano-silicon oxide cakes composed of nano-silicon oxide with small particle size and ultra-high specific surface area

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