Monodisperse large-grain-diameter and high-stability acid silica sol and preparation method thereof

A technology of acidic silica sol and high stability, which is applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc. It can solve the problems of poor stability, difficulty in controlling the particle size of acidic silica sol, large dispersion, etc., and achieve short production cycle , Facilitate large-scale industrial production and increase the effect of steric hindrance

Inactive Publication Date: 2012-05-02
HUBEI UNIV
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Problems solved by technology

[0009] The present invention aims at the problems of difficulty in controlling the particle size of the acidic silica sol prepared by the known ion exchange method, large dispersion, and poor stability, and provides a simple preparation process, and the product has good storage stability, monodisperse, large particle size, and high stability. Acidic silica sol and its production method

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  • Monodisperse large-grain-diameter and high-stability acid silica sol and preparation method thereof

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preparation example Construction

[0027] The preparation steps of the present invention are as follows:

[0028] (1) Dilute industrial sodium ions with deionized water to obtain a water glass solution with a concentration of 1-10%, carry out an exchange reaction through a styrene-based strongly acidic cation exchange resin, remove sodium ions and other cationic impurities, and obtain a concentration of 1 -10% active silicic acid solution,

[0029] (2) in the 100ml water glass solution that the pH value is 8-11, the concentration under boiling state is 1-10%, add dropwise the active silicic acid solution that 50-300ml step (1) prepares, by adding 0.3 -2ml alkaline solution, control the pH value in the range of 8-10, cool after the reaction, and age for 2-6 hours to obtain the primary mother liquor of silica sol, the concentration is 1-10%,

[0030] The alkaline solution is one or more of sodium hydroxide, ammonia water, and sodium carbonate; the concentration of sodium hydroxide, ammonia water, and sodium carb...

Embodiment 1

[0040] (1) Dilute industrial sodium ions with deionized water to obtain a concentration of 6% water glass solution, carry out exchange reaction by styrene series strongly acidic cation exchange resin, remove sodium ions and other cationic impurities, and obtain a concentration of 5% Active silicic acid solution,

[0041](2) in the 100ml water glass solution that the pH value is 10, the concentration under boiling state is 6%, add dropwise the active silicic acid solution that 150ml step (1) prepares, by adding 0.5ml sodium hydroxide (1mol / L) and 0.5ml ammoniacal liquor (1mol / L), control the pH value at about 10, cool after the reaction, and age for 6 hours to obtain the primary mother liquor of silica sol, with a concentration of 6%.

[0042] (3) Get the primary mother liquor prepared by 100ml to heat under normal pressure and keep boiling and evaporating, add dropwise the active silicic acid solution prepared by 150ml step (1) again under stirring, by adding 0.5ml sodium hyd...

Embodiment 2

[0046] (1) Dilute industrial sodium ions with deionized water to obtain a concentration of 4% water glass solution, carry out exchange reaction by styrene series strongly acidic cation exchange resin, remove sodium ions and other cationic impurities, and obtain a concentration of 3.5% Active silicic acid solution.

[0047] (2) in the 100ml water glass solution that the pH value is 9, the concentration under boiling state is 4%, drip the active silicic acid solution that 300ml step (1) prepares, by adding 0.3ml sodium carbonate (1mol / L) and 0.5ml ammoniacal liquor (1mol / L), control the pH value at about 9, cool after the reaction, and age for 4 hours to obtain a primary mother liquor of silica sol, with a concentration of 4%.

[0048] (3) Get the primary mother liquor prepared by 100ml to heat under normal pressure and keep boiling and evaporating, add dropwise the active silicic acid solution prepared by 300ml step (1) again under stirring, and add 0.5ml sodium carbonate (1mo...

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Abstract

The invention relates to monodisperse large-grain-diameter and high-stability acid silica sol and a preparation method thereof. The silica sol comprises water and silica colloid, wherein the silica colloid is dispersed in the water and has the granularity being 10 to 100 nm, the pH value of a sol system is 1.0 to 6.0, and the solid content is 10 to 35 percent. The preparation method comprises thefollowing steps that: firstly, active silicic acid is prepared through an ion exchange method and is added into boiling water glass to be prepared into basic silica sol with the uniform granularity, organic acid is adopted for surface modification, finally, the acid silica gel is prepared through iron exchange, and the silica sol is concentrated to the required concentration. Small-granularity and low-concentration products are adopted as the mother liquid, the sol grain growth process is controlled through controlling the dripping times of the active silicic acid and simultaneously regulating the pH value and the reaction time of a reaction system, and the monodisperse large-grain-diameter and high-stability acid silica sol products are obtained. The product stability is good, the coagulation and gel phenomena can not occur after the storage for more than six months at the normal temperature, the production period is short, and the mass industrial production is favorably realized.

Description

technical field [0001] The invention relates to a silica sol and a manufacturing method thereof, in particular to a monodisperse, large particle size, high-stability acidic silica sol and a manufacturing method thereof. Background technique [0002] Silica sol is a colloidal solution formed by uniformly dispersing aggregated particles of amorphous silica in water. As an important inorganic polymer material, it has been widely used in the fields of chemical industry, precision casting, textile, papermaking, materials, coatings and electronics. According to the pH range of the solution, it can be divided into acidic silica sol and alkaline silica sol. Alkaline silica sol is a stable system. There are many patents on its preparation and application at home and abroad, such as KR920005405B, JP2006036605, GB1211483, CN1352673, CN1084490, and CN1155514. [0003] Compared with alkaline silica sol, acidic silica sol is in a metastable state, and gelation will gradually occur durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/141
Inventor 董兵海王世敏张丹赵丽蒋涛许祖勋
Owner HUBEI UNIV
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