Hydroxy acrylic resin aqueous dispersion and water-based coating prepared therefrom

A technology of hydroxyacrylic acid and dispersion, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as insufficient gloss, low solid content in coating construction, and inconvenient use

Active Publication Date: 2010-12-15
LANGFANG JINHUILI INDAL PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the coating made of this resin low in solid content and inconvenient to use; even if it is used reluctantly, the gloss is not high enough

Method used

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  • Hydroxy acrylic resin aqueous dispersion and water-based coating prepared therefrom

Examples

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Effect test

example 1

[0034] This example is intended to demonstrate the preparation of aqueous dispersions of hydroxyacrylic resins, as follows:

[0035] (1) Add 100g propylene glycol butyl ether into the reaction vessel and stir to heat up to 150-160°C; add 100g styrene, 150g methyl methacrylate, 30g butyl acrylate, 90g hydroxyethyl acrylate, 30g dodecyl acrylate , 4g of n-dodecyl mercaptan and 12g of di-tert-butyl peroxide are mixed and dissolved to make a monomer drop feed, and the monomer drop feed is added to the reactor after the temperature of the reaction vessel rises to 150-160°C. Keep the reaction temperature at 150-160°C, and add the monomer dropwise for 4 hours. After the monomer is added dropwise, keep warm at 150-160°C for 1 hour. The weight solid content of the obtained resin solution is 80%, does not contain carboxyl group, and the number average molecular weight of the resin is 4000-5000.

[0036] (2) The temperature of the polymerization product in the first step is kept at 140...

example 2

[0040] This example shows aqueous dispersions of hydroxyacrylic resins prepared using different initiators, as follows:

[0041] (1) Add 100g ethylene glycol butyl ether into the reaction vessel and stir to heat up to 155-165°C; add 100g styrene, 200g methyl methacrylate, 216g butyl acrylate, 224g hydroxypropyl methacrylate, 60g coconut acrylic acid Oleate, 8g of n-dodecyl mercaptan, and 24g of di-tert-amyl peroxide are mixed and dissolved to make a monomer drop feed, and the monomer drop feed is added dropwise to the reactor after the temperature of the reaction vessel rises to 155-165°C. Keep the reaction temperature at 155-165° C., and add the monomer dropwise for 4 hours. After the monomer is added dropwise, keep warm at 155-165°C for 1 hour. The obtained resin solution had a solid content of 89% by weight. It does not contain carboxyl groups, and the number average molecular weight of the resin is 3500-4500.

[0042] (2) The temperature of the polymerization product in...

example 3

[0046] This example is intended to demonstrate the preparation of aqueous dispersions of hydroxylated acrylic resins with varying hydroxyl content

[0047] (1) Add 140g propylene glycol butyl ether into the reaction vessel and stir to heat up to 155-165°C; add 200g styrene, 300g methyl methacrylate, 100g butyl acrylate, 140g hydroxyethyl methacrylate, 60g dodecyl acrylate base ester, 8g of n-dodecyl mercaptan, and 24g of di-tert-amyl peroxide are mixed and dissolved to make a monomer drop feed, and the monomer drop feed is added to the reactor after the temperature of the reaction vessel rises to 155-165°C. Keep the reaction temperature at 155-165° C., and add the monomer dropwise for 4 hours. After the monomer is added dropwise, keep warm at 155-165°C for 1 hour. The obtained resin solution has a solid content of 85% by weight.

[0048] (2) The temperature of the polymerization product in the first step is kept at 155-165°C. Mix 30g methyl methacrylate, 15g butyl acrylate, ...

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Abstract

The invention discloses a method for preparing a hydroxy acrylic resin aqueous dispersion and the hydroxy acrylic resin aqueous dispersion prepared by the same and water-based coating using the hydroxy acrylic resin aqueous dispersion as a film forming matter. The hydroxy acrylic resin aqueous dispersion is prepared by a step free radical solution polymerization process and obtains a nucleus-shell structure by using an initiator of a specific type and a chain transfer agent and by a high-temperature polymerization reaction. The nucleus has weak hydrophilicity and no carboxyl, and the shell has a strong hydrophilicity and is rich in carboxyl, so stable storage can be realized. The obtained hydroxy acrylic resin aqueous dispersion has the characteristics of low solution content, high solid content and low viscosity. The coating prepared from the hydroxy acrylic resin aqueous dispersion and a water-based amino resin or a water-based polyurethane cross-linking agent has the characteristics of high brightness, good water resistance and excellent weather resistance. The hydroxy acrylic resin aqueous dispersion can be used for preparing an excellent base material of high-performance environment-friendly industrial protective coatings and widely applied to topcoats and primer-topcoat coatings in various fields.

Description

technical field [0001] The invention relates to a water-based dispersion of hydroxyacrylic resin in the field of chemical water-based paints and a water-based paint prepared therefrom. Background technique [0002] The use of solvent-based coatings is limited due to serious environmental and health problems. Environmentally friendly water-based coatings are the current development trend of the coatings industry, and various water-dispersed resins can be seen in the market. Water-based hydroxyacrylic resins are widely used in water-based amino baking varnish topcoats and two-component polyurethane self-drying topcoats due to their high gloss, good weather resistance, and color and gloss retention. Large aqueous resin dispersion. The former has low gloss, and due to the presence of emulsifiers, it also has the problem of poor water resistance and corrosion resistance; the latter has low solid content in construction, and the gloss is not high enough, and it is difficult to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/04C08F265/06C08F2/38C08F2/06C08L51/00C09D161/20C09D175/04
Inventor 陈鹏
Owner LANGFANG JINHUILI INDAL PAINT
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