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A kind of stable modified silica sol and preparation method thereof

A silica sol modification technology, applied in the field of chemical engineering, can solve problems such as easy gelation, poor stability of silica sol, short stable period, etc., and achieve the effect of reducing the probability of polymerization

Active Publication Date: 2016-01-20
SHANGHAI XINANNA ELECTRONICS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like figure 1 As shown, the silica sol has high stability in the range of pH9-12, and has a wide metastable region in the range of pH2-4, while in the acid neutral region, the stability of the silica sol is poor and the stable period is short, and it is easy to gel.

Method used

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  • A kind of stable modified silica sol and preparation method thereof
  • A kind of stable modified silica sol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Experimental instruments and reagents

[0035] 1) Instruments:

[0036] D-7401-W electric stirrer

[0037] BT300-1FLongerpump

[0038] HDM-5000 digital temperature control electric heating mantle

[0039] HH.BII-420-S-II Electric Heating Constant Temperature Incubator

[0040] NicompTM380 / ZLS ξ Potential / Particle Size Meter

[0041] 2) Conditions: Atmospheric pressure

[0042] 3) Reaction raw materials:

[0043] Silica sol: particle size 10~20nm, concentration 30wt%, pH 9~10.

[0044] Metal salt solution: magnesium sulfate 0.1wt%;

[0045] Solvent: deionized water;

[0046] 2. Experimental methods and results

[0047] The alkaline silica sol to be modified (particle size 10~20nm, concentration 30wt%, pH 9~10) is mixed with anion exchange resin for exchange reaction to obtain anion-removed silica sol; Heating to make it boil, under boiling conditions, add 0.1wt% magnesium sulfate dropwise to the anion-removing silica sol while stirring, the addition of 0.1wt...

Embodiment 2

[0050] 1. Experimental instruments and reagents

[0051] 1) Instrument:

[0052] D-7401-W electric stirrer

[0053] BT300-1FLongerpump

[0054] HDM-5000 digital temperature control electric heating mantle

[0055] HH.BII-420-S-II Electric Heating Constant Temperature Incubator

[0056] NicompTM380 / ZLS ξ Potential / Particle Size Meter

[0057] 2) Conditions: Atmospheric pressure

[0058] 3) Reaction raw materials:

[0059] Silica sol: particle size 70~80nm, concentration 40wt%, pH 10~11.

[0060] Metal salt solution: magnesium nitrate 5wt%;

[0061] Solvent: deionized water;

[0062] 2. Experimental methods and results

[0063] Mix the alkaline silica sol to be modified (particle size 70~80nm, concentration 40wt%, pH 10~11) with anion exchange resin for exchange reaction to obtain anion-removed silica sol; Heating to make it boil, while stirring under boiling conditions, add 5wt% magnesium nitrate dropwise to the anion-removing silica sol, the addition of 5wt% magnesium ...

Embodiment 3

[0066] 1. Experimental instruments and reagents

[0067] 1) Instrument:

[0068] D-7401-W electric stirrer

[0069] BT300-1FLongerpump

[0070] HDM-5000 digital temperature control electric heating mantle

[0071] HH.BII-420-S-II Electric Heating Constant Temperature Incubator

[0072] NicompTM380 / ZLS ξ Potential / Particle Size Meter

[0073] 2) Conditions: Atmospheric pressure

[0074] 3) Reaction raw materials:

[0075] Silica sol: particle size 10~20nm, concentration 30wt%, pH 9~10.

[0076] Metal salt solution: calcium nitrate 10wt%;

[0077] Solvent: deionized water;

[0078] 2. Experimental methods and results

[0079] The alkaline silica sol to be modified (particle size 10~20nm, concentration 30wt%, pH 9~10) is mixed with anion exchange resin for exchange reaction to obtain anion-removed silica sol; Heat to make it boil, and add 10wt% calcium nitrate dropwise to the anion-removing silica sol while stirring under boiling conditions, the addition of 10wt% calciu...

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Abstract

The invention relates to the field of chemical engineering, and particularly relates to a stable modified silica solution with a wide pH range and a preparation method of the stable modified silica. The preparation method of the stable modified silica solution comprises the following steps: mixing a to-be-modified alkaline silica solution with anion exchange resin to carry out exchange reaction, so as to obtain a silica solution from which anions are removed; heating to boil, agitating and dropwise adding a metal salt solution to obtain to-be-reacted liquid; putting the to-be-reacted liquid into a reaction kettle to react for 0.5-24 hours, wherein the reaction temperature is 100-150 DEG C, so as to obtain a reaction product; mixing the reaction product with cation exchange resin to carry out exchange reaction; removing metal ions in the reaction product, so as to obtain modified silica solution. According to the modified silica solution, the grain sizes of the colloidal particles are 10-60nm, the silicon dioxide content is 0.1-40%, the pH value is 3-11, and the modified silica solution can meet the application requirements of the fields such as coatings, textiles and semiconductors after being placed at normal temperature for over a year.

Description

technical field [0001] The invention relates to the field of chemical engineering, in particular to a modified silica sol stable in a wide pH range and a preparation method thereof. Background technique [0002] Silica sol is a colloidal solution formed by uniformly dispersing amorphous silica aggregate particles in water. As an important inorganic polymer material, it has a large specific surface area, good dispersibility, good cohesiveness, and durability. Excellent properties such as wetness and good insulation, so it is widely used in chemical industry, paint, textile, papermaking, adhesive, catalyst, medicine and electronic industry and other fields. Silica sol mostly uses water as a solvent, the concentration is generally ≤40%, the particle size is 5-100nm, it is odorless and non-toxic, and its appearance is generally milky white or transparent solution. Most of them are only stable under alkaline conditions of pH ≥9. Sodium hydroxide, potassium hydroxide, ammonia wat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/146
Inventor 古双娜王良咏施鹰刘卫丽宋志棠
Owner SHANGHAI XINANNA ELECTRONICS TECH
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