Acrylate modified waterborne polyurethane emulsion and preparation method thereof

A water-based polyurethane and acrylate technology, applied in the field of polymer chemical materials, can solve the problems of low water resistance, poor physical and mechanical properties, and large energy consumption, and achieve the effects of stable product properties, improved mechanical properties, and broad application prospects.

Inactive Publication Date: 2016-04-06
HUIZHOU RES INST OF SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based polyurethane not only has the basic characteristics of solvent-based polyurethane, such as cold resistance, good elasticity, high gloss, and adjustable temperature of soft and hard segments, but also has the advantages of non-combustibility, non-toxic, and pollution-free, but it also has low solid content and physical and mechanical problems. Poor performance, poor water resistance, poor heat resistance and other shortcomings, which largely affect the application of waterborne polyurethane
Chinese patent (CN101429417A) discloses a highly adhesive water-based polyurethane adhesive that adopts aliphatic isocyanate synthesis. Although the solid content has increased, it cannot avoid the characteristics of poor mechanical properties and lower water resistance of the film; Chin

Method used

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  • Acrylate modified waterborne polyurethane emulsion and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Add 25 parts of polycarbonate diol with a molecular weight of 2000 into a dry reactor, heat to melt the polycarbonate diol in the reaction bottle, vacuumize at 120°C to remove water for 1 hour, and then lower the temperature To 80°C, add 10 parts of isophorone diisocyanate and 0.1% by mass of dibutyltin dilaurate into the reaction flask, and react under nitrogen protection at 80°C for 2 hours, then add 2 parts of dihydroxypropionic acid to react Obtain prepolymer in 2 hours;

[0028] (2) The reaction is lowered to 70° C., and 5 parts of hydroxypropyl acrylate are added to perform a capping reaction for 2 hours to obtain a polyurethane prepolymer with active double bonds introduced into the main chain;

[0029] (3) After the reaction, the temperature was lowered to 40°C and a total of 15 parts of methyl acrylate and methyl methacrylate were added to reduce the viscosity of the prepolymer, and then 2 parts of triethylamine were added for neutralization reaction for ha...

Embodiment 2

[0032] (1) Add 25 parts of polybutylene adipate diol with a molecular weight of 2000 into a dry reactor, heat to melt the polycarbonate diol in the reaction bottle, and then vacuumize at 120°C to remove water for 1 hour, then lower the temperature to 80°C, add 10 parts of isophorone diisocyanate and 0.1% by mass of dibutyltin dilaurate into the reaction flask, react for 2 hours at 80°C under the protection of nitrogen, and then add 3 parts of Dihydroxypropionic acid was reacted for 2 hours to obtain prepolymer;

[0033] (2) Adding 6 parts of hydroxypropyl acrylate under the protection of nitrogen at 80°C for a capping reaction for 2 hours to obtain a polyurethane prepolymer with active double bonds introduced into the main chain;

[0034] (3) After the reaction, the temperature was lowered to 40°C and a total of 15 parts of methyl acrylate and methyl methacrylate were added to reduce the viscosity of the prepolymer, and then 2 parts of triethylamine were added for neutralizati...

Embodiment 3

[0037] (1) Add 20 parts of polycarbonate diol with a molecular weight of 2000 into a dry reactor, heat to melt the polycarbonate diol in the reaction bottle, vacuumize at 120°C to remove water for 1 hour, and then lower the temperature To 80°C, add 10 parts of hexamethylene diisocyanate and 0.1% by mass of dibutyltin dilaurate into the reaction flask, react under nitrogen protection at 80°C for 2 hours, and then add 2 parts of dihydroxybutyric acid to react Obtain prepolymer in 2 hours;

[0038] (2) The reaction is lowered to 70° C., and 5 parts of pentaerythritol diacrylate are added for a capping reaction for 2 hours to obtain a polyurethane prepolymer with active double bonds introduced into the main chain;

[0039] (3) After the reaction, the temperature was lowered to 40°C and a total of 20 parts of ethyl acrylate and methyl methacrylate were added to reduce the viscosity of the prepolymer, and then 2 parts of triethylamine were added for neutralization reaction for half ...

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Abstract

The invention discloses acrylate modified waterborne polyurethane emulsion and a preparation method thereof. The acrylate modified waterborne polyurethane emulsion is prepared from the following components in parts by weight: 20-30 parts of polyhydric alcohols, 10-20 parts of diisocyanate, 2-6 parts of hydrophilic chain-extending agent, 2-5 parts of organic base, 5-15 parts of cross-linking agent, 10-25 parts of acrylate monomer, 100-200 parts of deionized water, 0.01-0.1 part of dibutyltin dilaurate, 0.2-1 part of initiator and 10-30 parts of acetone. Acrylate is used to modify waterborne polyurethane, and a polyurethane material excellent in overall performance is obtained; the acrylate is used to participate in reaction, double bonds are introduced to a polyurethane main chain, then acrylate monomer polymerization is triggered, and a complex net structure can be formed; compared with traditional waterborne polyurethane, water resistance, heat resistance and mechanical property are obviously improved.

Description

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Claims

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Application Information

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Owner HUIZHOU RES INST OF SUN YAT SEN UNIV
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