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Alkali swelling acrylate associative thickener and preparation method thereof

An associative thickener and acrylate technology, applied in coatings, latex paints, etc., can solve problems such as lack of comprehensive performance, unbalanced paint fluidity and precipitation, and achieve excellent thickening properties , good storage stability and workability, and the effect of increasing shear viscosity

Pending Publication Date: 2020-06-05
SHANGHAI BAOLIJIA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the existing acrylate thickeners are used in the field of coatings, they still cannot achieve excellent comprehensive performance, and cannot achieve a relatively balanced effect on the fluidity and precipitation of coatings.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0043] A second aspect of the present invention provides a method for preparing the alkali-swellable acrylate associative thickener, at least including the following steps:

[0044] (1) Preparation of pre-emulsion: add part of emulsifier, water, unsaturated reactive monomer, special associative monomer, cross-linking agent to the monomer tank, and stir to obtain pre-emulsion;

[0045] (2) Prepare the bottom material of the reaction kettle: add the remaining emulsifier and water into the reaction kettle, stir, heat up to 80-95°C, add 1-15% of the pre-emulsion, the first initiator solution, and react for 5-35 minutes; the concentration of the first initiator solution is 0.1-10wt%;

[0046] (3) Polymerization reaction: add dropwise the remaining pre-emulsion and the second initiator solution to the reaction kettle, and the dropwise addition time is 1-3 hours, and the reaction temperature is controlled at 80-95° C.; the concentration of the second initiator solution 0.1-10wt%;

...

Embodiment 1

[0062] a) Prepare emulsion, weigh 240g deionized water, 10g ethoxylated alkylsulfate sodium salt emulsifier, stir for 15 minutes, add 89.6g methacrylic acid, 134.4g ethyl acrylate, 24.6g special vinyl monomer , 0.11g cross-linking agent hexanediol diacrylate, stirred for 30 minutes to obtain a pre-emulsion.

[0063] b) Prepare the bottom material by weighing 200 g of deionized water and 5 g of ethoxylated alkylsulfate sodium salt emulsifier and stirring for 10 minutes.

[0064] c) When the temperature in the kettle rises to 85° C., add 5% pre-emulsion to the kettle, add 5.25 g ammonium persulfate solution (dissolve 0.25 g ammonium persulfate with 5 g water), and react for 10 minutes.

[0065] d) Add the remaining emulsion and 70.4g of ammonium persulfate solution (dissolve 0.4g of ammonium persulfate in 70g of water), dropwise for 2 hours, and control the reaction temperature at 85-90°C.

[0066] e) After the dropwise addition, the reaction was incubated for 1 hour. Cool dow...

Embodiment 2

[0070] a) To prepare an emulsion, weigh 300 g of deionized water, 11 g of polyoxyethylene ether sulfate emulsifier, stir for 15 minutes, add 109.2 g of methacrylic acid, 170.8 g of ethyl acrylate, and 28.0 g of special vinyl monomers, Stir for 30 minutes and add 0.3 g of diallyl phthalate as a crosslinking agent to obtain a pre-emulsion.

[0071] b) To prepare the bottom material, weigh 250g of deionized water and 3.6g of polyoxyethylene ether sulfate emulsifier and stir for 10 minutes.

[0072] c) When the temperature in the kettle rises to 88° C., add 9% pre-emulsion to the kettle, add 10.3 g of ammonium persulfate solution (dissolve 0.3 g of ammonium persulfate in 10 g of water), and react for 10 minutes.

[0073] d) Add the remaining emulsion and 90.5 g of ammonium persulfate solution (dissolve 0.5 g of ammonium persulfate in 90 g of water) dropwise for 2 hours, and control the reaction temperature at 84-88° C.

[0074] e) After the dropwise addition, the reaction was inc...

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Abstract

The invention relates to the technical field of thickeners, and provides an alkali swelling acrylate associative thickener, which at least comprises the following raw materials: an unsaturated reaction monomer, a special associative monomer, a crosslinking agent and an emulsifier, wherein the use amount of the special associative monomer is 5-20 wt% of that of the unsaturated reaction monomer, theuse amount of the crosslinking agent is 0.005-0.2 wt% of that of the unsaturated reaction monomer, and the use amount of the emulsifier is 2.0-10 wt% of that of the unsaturated reaction monomer. Theenvironment-friendly emulsifier, the special associative monomer, the acrylate monomer and the crosslinking agent containing at least two unsaturated double bonds are selected and subjected to emulsion polymerization to prepare the associative thickener, the preparation process is simple, and the product is green and environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of thickeners, in particular to an alkali-swellable acrylate associative thickener and a preparation method thereof. Background technique [0002] In the coatings industry, with the enhancement of people's awareness of environmental protection and the restrictions on organic volatile solvents in environmental regulations, water dispersion systems or water-based coatings are replacing traditional coatings and paints with organic solvents as the dispersed phase in more and more fields. Coatings have different requirements on the viscosity of the system during storage and construction, and these unique requirements can be achieved by adding appropriate thickeners. [0003] Acrylate thickener has the characteristics of low viscosity, strong thickening property, easy dispersion in coatings, good stability, and good antibacterial properties, so it is widely used in water-based coatings. At present, the preparatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/18C08F220/06C09D5/02C09D7/43
CPCC08F290/062C09D5/024C08F220/06
Inventor 史俊苗
Owner SHANGHAI BAOLIJIA NEW MATERIAL CO LTD
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