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Hydroxypolyacrylate emulsion, and preparation method and application thereof

A technology of hydroxy polyacrylate and hydroxy acrylate, applied in the field of hydroxy polyacrylate emulsion and its preparation, can solve the problems of poor chemical resistance, residual fluorine-containing monomer, high price, etc., and achieve water resistance and chemical resistance. Excellent, solve poor chemical resistance, improve the effect of paint film appearance

Active Publication Date: 2015-11-18
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polymerization stability of conventional polyacrylate emulsions with high hydroxyl content is poor, and industrial production is unstable.
In addition, excessive use of emulsifiers or improper combination of emulsifiers in emulsion polymerization will reduce the gloss and chemical resistance of the paint film
At present, the hardness and chemical resistance of waterborne two-component polyurethane paint films are improved by increasing the glass transition temperature and hydroxyl content of hydroxyl polyacrylate emulsions, which will also lead to the need for more organic small molecule film-forming aids in the process of paint formulation. agent and curing agent (the curing agent often contains a certain amount of co-solvent), increasing the content of volatile organic compounds (VOC) in the coating will also lead to an increase in the cost of the coating
Therefore, conventional methods are difficult to improve the poor appearance, poor chemical resistance, and low hardness of hydroxyl polyacrylate emulsion two-component paint films.
[0005] Chinese invention patent application CN103059210 modifies the hydroxyl polyacrylate emulsion by adding 2%-5% fluorine-containing acrylic acid monomer, although the water resistance and chemical resistance of the two-component paint film will be slightly improved, due to the fluorine-containing acrylic acid The hydrophobic and oleophobic properties of the ester monomer make the conversion rate of the polymerization reaction not high, which easily causes a large amount of fluorine-containing monomers to remain, and also causes problems such as poor interlayer adhesion of the paint film, and the fluorine-containing acrylate monomer The high price has caused the cost of polymer emulsion to rise sharply, etc.

Method used

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  • Hydroxypolyacrylate emulsion, and preparation method and application thereof
  • Hydroxypolyacrylate emulsion, and preparation method and application thereof
  • Hydroxypolyacrylate emulsion, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Preparation of hydroxyl polyacrylate emulsion: the formula of hydroxyl polyacrylate emulsion (hydroxyl value=65mgKOH / g) is shown in Table 1a:

[0037] Table 1a

[0038]

[0039] Preparation process: Mix 1-9 to prepare monomer mixture, take 10% monomer mixture and pre-emulsify it with 0.05 parts of emulsifier (including 0.025 parts of KL-525 and 0.025 parts of COPS-2) and 2.75 parts of water as seed pre-emulsification liquid. Add the remaining emulsifier, sodium bicarbonate, 0.1 part of initiator (potassium persulfate), and 25 parts of deionized water into the reaction kettle, raise the temperature to 78°C, stir for 15 minutes, and drip the seed pre-emulsion within 20 minutes at a constant speed , and wait for the emulsion to be stable for half an hour to obtain the seed emulsion. Keep the temperature of the reaction system at 80°C. Mix the remaining mixed monomers with the rest of the monomers, then add dropwise to the seed emulsion, and at the same time add d...

Embodiment 2

[0052] (1) Preparation of hydroxyl polyacrylate emulsion: the formula of hydroxyl polyacrylate emulsion (hydroxyl value=65mgKOH / g) is shown in Table 2a:

[0053] Table 2a

[0054]

[0055] Preparation method: Mix 1-8 to prepare monomer mixture, take 15% of monomer mixture and dissolve it with 0.1 part of emulsifier (0.05 parts of SR-10 and ER-30) and 3 parts of water to pre-emulsify it as seed pre-emulsification liquid. Add the remaining emulsifier, sodium bicarbonate, 0.1 part of initiator (ammonium persulfate), and 30 parts of deionized water into the reaction kettle, raise the temperature to 80°C, stir for 30 minutes, and drip the seed pre-emulsion within 30 minutes at a constant speed , and wait for the emulsion to be stable for half an hour to obtain the seed emulsion. Keep the temperature of the reaction system at 80°C. Add the remaining monomer mixture dropwise to the seed emulsion, and at the same time add dropwise an aqueous solution in which 0.2 parts of the in...

Embodiment 3

[0067] (1) Preparation of hydroxyl polyacrylate emulsion: the formula of hydroxyl polyacrylate emulsion (hydroxyl value=70mgKOH / g) is shown in Table 3a:

[0068] Table 3a

[0069]

[0070] Preparation process: Mix 1-8 to prepare a monomer mixture, take 12% monomer mixture and pre-emulsify it with 0.1 part of emulsifier (0.05 parts of each of the two emulsifiers) and 3 parts of water as a seed pre-emulsion. Add the remaining emulsifier, sodium bicarbonate, 0.1 part of initiator (KPS), and 20 parts of deionized water into the reaction kettle, raise the temperature to 82°C, stir for 15 minutes, and drip the seed pre-emulsion at a constant speed within 15 minutes. The emulsion was stable for half an hour to obtain a seed emulsion. The temperature of the reaction system was kept at 82°C. Mix the remaining monomer mixture with the rest of the monomers, then add dropwise to the seed emulsion, and at the same time add dropwise an aqueous solution of 0.2 parts of initiator (KPS) d...

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Abstract

The invention discloses a hydroxypolyacrylate emulsion, and a preparation method and an application thereof. The preparation method comprises the following steps: weighing an acrylate monomer and / or a metacrylate monomer, a hydroxyacrylate monomer, an acrylic monomer, an acrylate function monomer and a hydroxy oligomer, uniformly mixing to prepare a monomer mixture, weighing 10-15% of the monomer mixture, and emulsifying by using an emulsifier to prepare a seed pre-emulsion for later use; and adding the emulsifier, sodium bicarbonate and deionized water into a reaction kettle, stirring, rising the temperature of a reaction system, adding an initiator, stabilizing, adding the seed pre-emulsion in a dropwise manner, stabilizing, adding the remaining monomer mixture and the remaining initiator in a dropwise manner, heating, slaking, cooling, neutralizing, carrying out heat insulation, cooling, and discharging to obtain the hydroxypolyacrylate emulsion. A film made by using an aqueous dual-component polyurethane coating prepared from the hydroxypolyacrylate emulsion and an aqueous polyisocyanate curing agent has the advantages of high hardness, high luster and excellent chemical resistance.

Description

technical field [0001] The invention relates to a water-based two-component polyurethane coating, in particular to a hydroxyl polyacrylate emulsion and its preparation method and application. Background technique [0002] Most of the existing wood coatings are solvent-based coatings, which contain more than 50% of organic solvents. These solvents will volatilize into the atmosphere during the construction process to pollute the environment and damage human health, and the organic solvents themselves will cause combustion, explosion, etc. Security risks. Therefore, water-based wood coatings are the development trend of international coatings. Waterborne wood coatings include one-component and two-component water-based wood coatings. Among them, the paint film properties of one-component water-based wood coatings include poor water resistance, chemical resistance and hardness, which are far behind oil-based coatings, which seriously limits the popularization and application ...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F212/08C08F220/18C08F220/28C08F220/06C08F220/56C08F2/24C09D175/04
CPCC08F2/24C08F212/08C08F220/06C08F220/14C08F220/56C09D175/04C08F220/1804C08F220/283
Inventor 瞿金清段晓俊朱延安
Owner SOUTH CHINA UNIV OF TECH
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