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Core-shell waterborne polyurethane/acrylic ester composite emulsion, preparation method thereof and damping paint of emulsion

A water-based polyurethane and acrylate technology, applied in the field of coatings, can solve the problems of poor stability of composite emulsion, poor compatibility of polyurethane and acrylate, poor damping performance, etc., and achieve the effect of reducing production costs, excellent damping performance and simple operation

Active Publication Date: 2019-05-10
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the currently prepared water-based polyurethane-acrylate composite emulsion generally has the defects of poor compatibility between polyurethane and acrylate, and poor stability of the composite emulsion, resulting in poor damping performance.

Method used

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  • Core-shell waterborne polyurethane/acrylic ester composite emulsion, preparation method thereof and damping paint of emulsion
  • Core-shell waterborne polyurethane/acrylic ester composite emulsion, preparation method thereof and damping paint of emulsion
  • Core-shell waterborne polyurethane/acrylic ester composite emulsion, preparation method thereof and damping paint of emulsion

Examples

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preparation example Construction

[0060] The present invention provides a preparation method of the core-shell type waterborne polyurethane / acrylate composite emulsion according to the above scheme, which includes the following steps:

[0061] (1) Mix oligomer diols, polyisocyanates, small molecular alcohol chain extenders, hydrophilic chain extenders, small molecular crosslinkers, organic solvents and catalysts to undergo polycondensation to obtain isocyanate-terminated polyurethane pre Aggregate

[0062] (2) Mixing the isocyanate-based polyurethane prepolymer in the step (1) with the blocking agent to cause a polycondensation reaction to obtain a waterborne polyurethane prepolymer;

[0063] (3) Mixing the water-based polyurethane prepolymer with part of acrylate monomers and a salt-forming agent to undergo a neutralization reaction to obtain a water-based polyurethane emulsion;

[0064] (4) Mixing the water-based polyurethane emulsion with the remaining acrylate monomers, emulsifiers, cross-linking agents, initiator...

Embodiment 1

[0092] (1) In a four-neck flask equipped with a stirring device, a condensing device, a thermometer and a nitrogen protection, add 60g polyethylene glycol (number average molecular weight is 2000), and vacuum dehydration at 70℃ for 2h, the vacuum degree is less than 0.1MPa, then add 37.5g isophorone diisocyanate, 5.6g 1,4-butanediol, 6.8g dimethylolpropionic acid, 2g trimethylolpropane, 11.3gN,N-dimethylol Acetamide and 60mg dibutyltin dilaurate, raise the system to 80°C at a heating rate of 5°C / min, and perform a polycondensation reaction at a stirring speed of 370r / min for 1 hour to obtain an isocyanate-terminated polyurethane prepolymer;

[0093] (2) After the isocyanate-terminated polyurethane prepolymer is obtained, 12.9g of hydroxyethyl acrylate is added, and the polycondensation reaction is carried out at a stirring speed of 370r / min and 80°C for 1h to obtain a waterborne polyurethane prepolymer;

[0094] (3) After the water-based polyurethane prepolymer is obtained, the wat...

Embodiment 2

[0098] Prepare the water-based polyurethane prepolymer according to the method of step (1) and (2) in Example 1, which will not be repeated here;

[0099] (3) After the water-based polyurethane prepolymer is obtained, the water-based polyurethane prepolymer system is cooled to 40°C at a cooling rate of 5°C / min, and 15g methyl methacrylate and 45g butyl acrylate are added to reduce the viscosity of the system. System-NCO value reaches 0, add 4.4g of triethylamine, carry out the neutralization reaction at a stirring speed of 370r / min for 10min, then slowly add 200mL of deionized water at a speed of 200ml / min, at a speed of 1200r / min , Emulsify at room temperature for 30 minutes to obtain an aqueous polyurethane emulsion;

[0100] (4) After the water-based polyurethane emulsion is obtained, the system temperature of the water-based polyurethane emulsion is increased to 75°C at a temperature increase rate of 5°C / min, and stirred at a rotation speed of 270r / min for 15 minutes to obtain ...

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Abstract

The invention belongs to the technical field of paint, and particularly relates to core-shell waterborne polyurethane / acrylic ester composite emulsion, a preparation method thereof and damping paint of the emulsion. Low polymer diol, polyisocyanate and acrylate monomers serve as bodies, polyurethane is connected with acrylic ester through chemical bonds under the combined action of small moleculealcohol chain extenders, hydrophilic chain extenders, organic solvents, catalysts, small molecule cross-linking agents, salt-forming agents, emulsifiers, cross-linking agents, initiators and water bythe aid of double bonds and hydroxy in end capping agents, compatibility of the polyurethane and the acrylic ester is improved, and the stability and the damping performance of the core-shell waterborne polyurethane / acrylic ester composite emulsion can be improved.

Description

Technical field [0001] The invention relates to the technical field of coatings, in particular to a core-shell type waterborne polyurethane / acrylate composite emulsion, a preparation method thereof, and a damping coating. Background technique [0002] People pay more and more attention to noise pollution and its harm, and it is considered to be the third largest public hazard after air pollution and water pollution. The control of noise pollution has become a hot topic in today's society. Damping coating is a new type of functional coating that can absorb vibrational mechanical energy and convert it into heat energy for dissipation. Damping vibration reduction and noise reduction technology mainly uses the principle that damping materials convert kinetic energy into thermal energy when subjected to external forces, reducing the resonance amplitude of the structure, improving fatigue life and reducing structure noise. The displacement hysteresis of polymer materials under the act...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08F220/14C08F220/18C08F212/36C09D175/14C09D133/08
Inventor 邓云娇周超张明耀张会轩张求学贾育霖
Owner CHANGCHUN UNIV OF TECH
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