Preparation method of water-based thickener

A water-based thickener and aqueous solution technology, which is applied in the direction of coating, etc., can solve the problems of poor anti-sedimentation effect, low overall viscosity, easy delamination, water separation, etc., to reduce particle size, prevent mutual attraction and agglomeration, The effect of good dispersion stability

Active Publication Date: 2019-12-20
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

[0029] A kind of preparation method of water-based thickener of the present embodiment, comprises the steps:

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 4) Accordin...

Embodiment 2

[0037] A kind of preparation method of water-based thickener of the present embodiment, comprises the steps:

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 4) Accord...

Embodiment 3

[0045] A kind of preparation method of water-based thickener of the present embodiment, comprises the steps:

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 4) According to step (3), the mass rat...

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Abstract

A preparation method of a water-based thickener comprises the following steps: mixing deionized water, sodium hydroxide and sodium bicarbonate to prepare a buffer solution; mixing deionized water, analuminum salt and a magnesium salt to prepare a magnesium-aluminum-containing aqueous solution; mixing deionized water, polyvinylpyrrolidone and sodium hydroxide to prepare a polyvinylpyrrolidone-containing solution; under a stirring condition, dropwise adding water glass, the magnesium-aluminum-containing aqueous solution and the polyvinylpyrrolidone-containing solution into the buffer solution in sequence to obtain a crystallization solution; crystallizing the obtained crystallization liquid at a constant temperature, and then carrying out cooling, centrifuging, water washing , drying, crushing and sieving to obtain a finished product. According to the preparation method, polyvinylpyrrolidone is inserted into layers of magnesium-oxygen octahedrons and silicon-oxygen tetrahedrons of a magnesium-aluminum silicate mineral through an in-situ hydrothermal synthesis method; and meanwhile, polyvinylpyrrolidone is adsorbed on the inner and outer surfaces of magnesium-aluminum silicate mineral particles through intermolecular force and hydrogen bonds, so that dispersion stability of the magnesium-aluminum silicate mineral in water is improved, and overall viscosity is improved.

Description

[0001] (1) Technical field [0002] The invention relates to a preparation method of an aqueous thickener. [0003] (2) Background technology [0004] 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. [0005] 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 thick...

Claims

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Application Information

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Patent Type & Authority Applications(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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