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Core-shell type polyurethane-acrylate emulsion, and preparation method and application thereof

A technology of acrylic emulsion and polyurethane, applied in the direction of coating, etc., can solve the problems of high viscosity, poor fluidity and film-forming properties

Active Publication Date: 2019-10-11
CHANGSHU BATF TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] It can be seen from the above that there are many preparation methods for the preparation of polyurethane-acrylic emulsion in the prior art, which are used to improve the bonding between polyurethane and acrylic acid, and these methods are basically the prepolymerization of linear high polymer melt and concentrated solution These fluids do not obey Newton's law, have high viscosity, poor fluidity and film-forming properties, and there are still many problems, so it is urgent to seek technical solutions for improvement

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  • Core-shell type polyurethane-acrylate emulsion, and preparation method and application thereof

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[0060] The embodiment of the present invention also discloses a method for preparing the core-shell type polyurethane-acrylic emulsion as above, including the steps: S10), preparing a hyperbranched polyester modified polyurethane aqueous dispersion, and the operation steps include: first preparing isocyanate-blocked terminal polyurethane prepolymer, and then neutralize the carboxyl group in the isocyanate-terminated polyurethane prepolymer to form a salt, and then add the neutralized isocyanate-terminated polyurethane prepolymer into the hyperbranched polyester solution with carboxyl groups Carry out dispersion chain extension reaction in pure water to obtain hyperbranched polyester modified polyurethane aqueous dispersion; S20), prepare acrylate pre-emulsified monomer mixture, and its operation steps include: containing carbon-carbon double bond and can carry out copolymerization reaction monomer, acrylate and / or derivatives of methacrylate monomer, emulsifier and pure water a...

Embodiment 1

[0065] Embodiment 1: preparation has the hyperbranched polyester HPPE (I) of carboxyl group

[0066] Add 354.8g of Boltorn H40 and 74g of hexahydrophthalic anhydride into a 1L reaction kettle equipped with a stirrer, a thermometer, a nitrogen conduit and a reflux condenser, and then raise the temperature of the reaction system to 130°C. When the reaction temperature is constant, continue to keep warm at this temperature for 4-5h, and take samples every 1h to measure the acid value. When the measured value of the acid value (63mgKOH / g) reaches the theoretical value (62.8mgKOH / g), cool down the reaction system to 100° C.; finally add 48 g of triethylamine and 595 g of pure water to obtain a hyperbranched polyester with a carboxyl group having a solid content of 40%.

Embodiment 2

[0067] Embodiment 2: preparation has the hyperbranched polyester HPPE (II) of carboxyl group

[0068] Add 354.8g of Boltorn H40 and 98.6g of hexahydrophthalic anhydride into a 1L reaction kettle equipped with a stirrer, a thermometer, a nitrogen conduit and a reflux condenser, and then raise the temperature of the reaction system to 130°C. When the reaction temperature is constant, continue to keep warm at this temperature for 4-5h, during which the acid value is measured by sampling every 1h, and when the measured value of the acid value (79mgKOH / g) reaches the theoretical value (79.2mgKOH / g), the temperature of the reaction system is lowered to 100° C.; finally add 52 g of triethylamine and 400 g of pure water to obtain a hyperbranched polyester with a carboxyl group having a solid content of 50%.

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Abstract

The invention discloses a core-shell type polyurethane-acrylate emulsion. The polyurethane-acrylate emulsion comprises a hyperbranched polyester-modified polyurethane aqueous dispersion as a core structure, an acrylate pre-emulsified monomer mixture as a shell structure, and an inhibitor water solution for initiating a crosslinking and bonding reaction between the shell structure and the core structure. The hyperbranched polyester-modified polyurethane aqueous dispersion comprises polyfunctional isocyanate, polymer polyol, and hyperbranched polyester having a carboxyl group. The invention alsorelates to a preparation method and application of the core-shell type polyurethane-acrylate emulsion. The core-shell type polyurethane-acrylate emulsion has the advantages that the mechanical strength and hardness of aqueous polyurethane segments in the polyurethane-acrylate emulsion can be obviously improved, the water resistance and solvent resistance of the aqueous polyurethane segments are further enhanced, and the defects of high viscosity and low brittleness of acrylate segments in the polyurethane-acrylate emulsion can be obviously overcome; when the polyurethane-acrylate emulsion isused as a raw material of paint, the physical and mechanical properties, water resistance, solvent resistance, film formation properties and weather resistance of coating films can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a core-shell polyurethane-acrylic acid emulsion and a preparation method and application thereof. Background technique [0002] As we all know, water-based polyurethane has excellent film-forming properties, and the coating film prepared by water-based polyurethane has the advantages of excellent elasticity, gloss, wear resistance, low temperature impact resistance, and softness and hardness do not change much with temperature. , water resistance and alcohol resistance and other performance defects. For acrylic resin, its coating film has excellent weather resistance, and can provide excellent hardness performance, excellent water resistance and alcohol resistance, but acrylic resin has the disadvantage of high viscosity and low brittleness, which makes it resistant to temperature changes. more sensitive. Therefore, in the prior art, acrylic resin is usual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/18C08G18/67C08G18/66C08G18/42C08G18/34C08G18/32C09D151/08
CPCC08F283/008C08G18/6659C08G18/675C08G18/664C08G18/4277C08G18/348C08G18/3206C09D151/08
Inventor 张萌
Owner CHANGSHU BATF TECH CO LTD
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