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High-water-resistance acrylate emulsion and preparation method thereof

An acrylate, water resistance technology, applied in the direction of coating, can solve the problem of poor water resistance, and achieve the effect of reducing water absorption, reducing migration, and improving water resistance

Active Publication Date: 2012-07-04
GANSU JINDUN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Architectural coatings made from acrylate emulsions synthesized by conventional methods generally face the problem of poor water resistance, because some emulsifiers and hydrophilic monomers with strong hydrophilicity will be used in the emulsion preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Styrene 20g, butyl acrylate 20g, methyl methacrylate 5g, acrylic acid 1g, silicone monomer KH550 1g, mixed emulsifier 2g (op-10 0.4g, K12 0.8g, AHPS 0.8g), sodium bicarbonate 0.5 g, ammonium persulfate 0.5g, deionized water 50g.

[0022] (1) Prepare an initiator solution with 0.5g ammonium persulfate and 5g water. (5mL)

[0023] (2) In a 200mL four-necked bottle, mix 1.2g of mixed emulsifier, 20g of water, and 0.5g of sodium bicarbonate evenly, then add 3g of acrylic acid, 20g of butyl acrylate, 20g of styrene, 5g of methyl methacrylate, etc. to polymerize The monomer is dispersed at high speed to prepare the monomer pre-emulsion. Divide the pre-emulsion into A and B (the weight ratio of A:B is 2:1). Add 1g of silicone monomer KH550 to B and mix well.

[0024] (3) Put 0.8g of mixed emulsifier and 25g of water into a 200mL four-neck bottle, raise the temperature to 80-85°C, slowly add the prepared pre-emulsion A and pre-emulsion B successively, and drop the initiator s...

Embodiment 2

[0027] Styrene: 25g, butyl acrylate: 15g, methyl methacrylate 3g, acrylic acid 3g, silicone monomer KH551 2g, mixed emulsifier 1g (op-10 0.2g, K12 0.4g, HMPS 0.4g), bicarbonate Sodium 0.5g, sodium persulfate 0.5g, deionized water 50g.

[0028] The reaction process is as follows:

[0029] (1) Prepare an initiator solution (5 mL) by mixing 0.5 g of ammonium persulfate and 5 g of water.

[0030] (2) In a 200mL four-necked bottle, mix 0.8g of mixed emulsifier, 20g of water, and 0.5g of sodium bicarbonate evenly, and then add the formulated amount of polymerized monomers such as acrylic acid, butyl acrylate, styrene, and methyl methacrylate. Disperse the monomer at high speed to prepare monomer pre-emulsion. Divide the pre-emulsion into A and B (A:B weight ratio is 2:1), add 1g KH-550 to B and mix well.

[0031] (3) Put 1.2g of mixed emulsifier and 25g of water into a 200mL four-neck bottle, raise the temperature to 80-85°C, slowly add the prepared pre-emulsion A and pre-emulsion...

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PUM

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Abstract

The invention provides a high-water-resistance acrylate emulsion. The emulsion comprises the following raw materials in percentage by weight: 20%-25% of styrene, 15%-20% of butyl acrylate, 3%-5% of methyl methacrylate, 1%-3% of acrylic acid, 1%-2% of organic silicon monomer, 1%-2% of mixed emulsifying agent, 0.5% of sodium bicarbonate, 0.5% of initiator and the balance of water. According to the invention, in the emulsion polymerization process, a reaction type emulsifying agent is adopted to carry out a polymerization reaction, and the emulsifying agent is polymerized to a large molecule chain in the polymerization process, thereby reducing the transfer of the emulsifying agent in a paint film, reducing the water adsorption rate of the paint film and improving water resistance; through adopting a nucleus-shell polymerization process, a shell polymerization part is subjected to copolymerization modification with organic silicon, so that a hydrophobic structure is formed on the surface of a latex particle, thereby improving the water resistance after film formation finally; and through the synergistic effect of the two methods, the water resistance of the prepared emulsion is greatly improved and the prepared emulsion can be widely applied to production and preparation of paints for inner and outer walls.

Description

technical field [0001] The invention relates to the field of polymer material synthesis, specifically a high water resistance acrylate emulsion mainly used in architectural coatings, and the invention also includes a preparation method of the acrylate emulsion. Background technique [0002] Acrylic emulsions for architectural coatings have developed very rapidly in recent years. With the increasing application of water-based architectural coatings in daily life, the requirements for the performance of acrylic emulsions are also getting higher and higher. Architectural coatings made from acrylate emulsions synthesized by conventional methods generally face the problem of poor water resistance, because some emulsifiers and hydrophilic monomers with strong hydrophilicity are used in the emulsion preparation process. These hydrophilic components will show strong water absorption on the surface of the paint film, especially some small molecule emulsifiers inside the paint film, w...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F212/08C08F220/14C08F220/06C08F2/30C08F2/26C09D125/14C09D133/08
Inventor 程金奎曹新刚白玉宏
Owner GANSU JINDUN CHEM
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