A kind of preparation method of aqueous thickener

A technology of water-based thickener and aqueous solution, applied in the direction of coating, etc., can solve the problems of poor anti-sedimentation effect, easy delamination, water separation, low overall viscosity, etc., and achieve particle size reduction, good dispersion stability, Prevent the effect of mutual attraction and reunion

Active Publication Date: 2021-12-17
ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overall viscosity of artificially synthesized inorganic magnesium aluminum silicate minerals in aqueous media is low, the anti-settling effect is poor, and stratification and water separation are prone to occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of preparation method of water-based thickener of the present embodiment, comprises the steps:

[0026] 1) Mix 31.25 g of sodium hydroxide, 56.75 g of sodium bicarbonate, and 452 g of deionized water to prepare a lye with a concentration of sodium hydroxide of 1.73 mol / L and a concentration of sodium bicarbonate of 1.49 mol / L.

[0027] 2) 6.25 g of aluminum nitrate nonahydrate, 50.75 g of magnesium chloride hexahydrate, and 138 g of deionized water were prepared into an aqueous solution containing magnesium and aluminum with an aluminum ion concentration of 0.12 mol / L and a magnesium ion concentration of 1.82 mol / L.

[0028] 3) According to the mass ratio of polyvinylpyrrolidone, sodium hydroxide and deionized water as 2:3:100, mix 0.81g of polyvinylpyrrolidone with a molecular weight of 630000, 1.21g of sodium hydroxide and 40g of deionized water to prepare polyvinylpyrrolidone containing polyvinylpyrrolidone A solution of vinylpyrrolidone.

[0029] 4) Accordin...

Embodiment 2

[0033] A kind of preparation method of water-based thickener of the present embodiment, comprises the steps:

[0034] 1) Mix 31.19 g of sodium hydroxide, 54.76 g of sodium bicarbonate, and 430 g of deionized water to prepare a lye with a concentration of sodium hydroxide of 1.81 mol / L and a concentration of sodium bicarbonate of 1.51 mol / L.

[0035] 2) 3.03 g of aluminum chloride hexahydrate, 48.33 g of magnesium chloride hexahydrate, and 143 g of deionized water were prepared into an aqueous solution containing magnesium and aluminum with an aluminum ion concentration of 0.088 mol / L and a magnesium ion concentration of 1.67 mol / L.

[0036] 3) According to the mass ratio of polyvinylpyrrolidone, sodium hydroxide and deionized water of 4:4:100, mix 1.39g of polyvinylpyrrolidone with a molecular weight of 580000, 1.39g of sodium hydroxide and 35g of deionized water to prepare polyvinylpyrrolidone containing polyvinylpyrrolidone A solution of vinylpyrrolidone.

[0037] 4) Accord...

Embodiment 3

[0041] A kind of preparation method of water-based thickener of the present embodiment, comprises the steps:

[0042] 1) Mix 45 g of sodium hydroxide, 79 g of sodium bicarbonate, and 603 g of deionized water to prepare a lye with a concentration of sodium hydroxide of 1.87 mol / L and a concentration of sodium bicarbonate of 1.56 mol / L.

[0043] 2) 5.95 g of aluminum nitrate nonahydrate, 85.33 g of magnesium nitrate hexahydrate, and 217 g of deionized water were prepared into an aqueous solution containing magnesium and aluminum with an aluminum ion concentration of 0.073 mol / L and a magnesium ion concentration of 1.54 mol / L.

[0044] 3) According to the mass ratio of polyvinylpyrrolidone, sodium hydroxide and deionized water as 6:3:100, mix 2.09g of polyvinylpyrrolidone with a molecular weight of 600000, 1.04g of sodium hydroxide and 35g of deionized water to prepare polyvinylpyrrolidone containing A solution of vinylpyrrolidone.

[0045] 4) According to step (3), the mass rat...

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Abstract

A preparation method of an aqueous thickener: mixing deionized water, sodium hydroxide, and sodium bicarbonate to prepare a buffer solution; mixing deionized water, aluminum salts, and magnesium salts to prepare an aqueous solution containing magnesium and aluminum; mixing deionized water , polyvinylpyrrolidone, and sodium hydroxide were mixed to prepare a solution containing polyvinylpyrrolidone; under stirring conditions, water glass, an aqueous solution containing magnesium and aluminum, and a solution containing polyvinylpyrrolidone were added dropwise to the buffer solution in turn to obtain a crystal Chemical liquid; after constant temperature crystallization, the obtained crystallization liquid is cooled, centrifuged, washed with water, dried, crushed, and sieved to obtain the finished product; the present invention inserts polyvinylpyrrolidone into magnesium aluminum silicate by in-situ hydrothermal synthesis In the middle of the layers of magnesium oxygen octahedron and silicon oxygen tetrahedron of the mineral, at the same time, through intermolecular force and hydrogen bond, polyvinylpyrrolidone is adsorbed on the inner and outer surfaces of magnesium aluminum silicate mineral particles, which is beneficial to improve the quality of magnesium aluminum silicate. Dispersion stability of salt minerals in water increases overall viscosity.

Description

(1) Technical field [0001] The invention relates to a preparation method of an aqueous thickener. (2) Background technology [0002] Water-based coatings are non-toxic, harmless, safe, and have no fire hazards. They can effectively reduce the emission of volatile organic compounds (VOCs) and reduce environmental pollution. Due to the restriction of the performance of water-based paint additives, compared with oil-based paints, water-based paints currently used in my country occupy a small amount. Improving the storage stability of water-based paints and the performance of thickeners will help overcome the difficulties in storage and construction of water-based paints, and can promote the widespread use of water-based paints. [0003] Sodium carboxymethyl cellulose and natural polymers such as guar gum and xanthan gum are widely used as water-based paint thickeners. Although the apparent viscosity is high, they are prone to mildew. Traditional inorganic thickening and anti-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/43C09D7/44
CPCC09D7/43C09D7/44
Inventor 俞卫华周春晖童东绅张军瑞张彤
Owner ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
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