Process for producing easily dispersable duoparental nano-silicon dioxide

Abstract

A method for preparing amphiphilic nano silicon dioxide with good dispersity has main technical characteristics that a sodium silicate water solution with silicon dioxide weight content being 25-30% is heated to 50-60 DEG C, a titanic acid ester coupling agent is added, and stirring is performed evenly at a constant temperature; then dilute hydrochloric acid is slowly added at an even speed until the pH value reaches 8-9, and stirring is performed for 1 h; the temperature is risen to 70-80 DEG C, the titanic acid ester coupling agent is added according to 50% of the first adding amount, stirring is performed for 30 minutes, dilute hydrochloric acid is slowly added at an even speed again until the pH value of the reaction system reaches 6-7, the temperature is kept, and stirring is performed for 1 h; and the amphiphilic nano silicon dioxide powder with good dispersity can be obtained after the reaction solution is filtered, washed, heated and dried. The product has good amphiphilic performance, so as to be well compatible with organic matters in the added system, and have good hydrophilicity. The product only needs common dispersing or grinding equipment to disperse well in the nano state in the added system.

Description

technical field [0001] The invention relates to a preparation method of easily dispersible amphiphilic nano silicon dioxide. Background technique [0002] Nano-silica is commonly known as "ultrafine silica", because of its volume effect and surface effect, it exhibits specific properties in terms of magnetism, electricity, catalytic performance, adsorption performance, light absorption, thermal resistance, etc., and is widely used in catalysts. Petrochemicals, decolorizers, matting agents, rubber reinforcing agents, plastic fillers, ink thickeners, metal soft polishing agents, insulating fillers, advanced daily cosmetic fillers and spraying materials, etc. In recent years, people have paid more and more attention to its application fields and development potential, and enjoy the reputation of "industrial monosodium glutamate" and "the origin of material science". Due to the large specific surface area and high surface energy of nanoparticles, particle agglomeration is very ...

AI Technical Summary

Problems solved by technology

[0006] Different nano-silica preparation methods have their own characteristics, and some have different degrees of problems such as unsuitable for industrialization, complicated process, high equipment investment, and high production cost.

More importantly, the particle size of some products is too large, and the product particles are seriously agglomerated. It is difficult for users to open them with ordinary dispersion and mixing methods. In actual use, the desired effect of nano-products cannot be achieved. The main reason for these problems is that Nanoparticles have a large specific surface area and high surface energy, and are prone to particle agglomeration during preparation and use, forming secondary particles and making the particle size larger

In addition, most nano-silica does not undergo surface modification, so it is difficult to be directly used in organic systems. It does not have amphiphilic properties, which increases the difficulty of application and greatly limits the application fields of products.

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