A kind of non-voc high solid content water-based epoxy polyurethane primer and preparation method thereof

A technology of epoxy polyurethane and high solid content, applied in the direction of coating, etc., can solve the problems of environmental pollution, increase cost, etc., achieve high solid content, improve adhesion, and simple preparation process

Active Publication Date: 2016-08-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional preparation methods of PUA use a certain amount of organic co-solvents such as acetone or N-methylpyrrolidone to solve the solubility and viscosity problems. Organic solvents inevitably bring safety hazards, cause environmental pollution and increase costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Add 30 parts of vinyl monomer, namely methyl methacrylate, and 10 parts of polymer polyol, namely polyhexamethylene adipate with a molecular weight between 1000 and 2000, into the drying reactor in parts by mass , 10 parts of polyisocyanate compound that is hexamethylene diisocyanate, 0.3 parts of trimethylolpropane, 8 parts of hydrophilic chain extender that is a mixture of dimethylolpropionic acid and sodium dihydroxypropanesulfonate and 0.1 part of catalyst two Dibutyltin laurate was reacted at 70°C for 4 hours to obtain A;

[0027] 2) Add 1 part of vinyl monomer containing active hydrogen, namely hydroxyethyl methacrylate, to A in parts by mass for capping, react for 0.5-1 hour, then cool the system temperature to 20-40°C, and then add 1.4 parts of alkaline salt-forming agent ammonia water, neutralize for 20-30 minutes, then add 30 parts of water, stir and disperse for 10-20 minutes, then heat up to 70°C to obtain B;

[0028] 3) Dissolve 0.15 parts of the initia...

Embodiment 2

[0031] 1) Add 50 parts of vinyl monomers, namely ethyl acrylate, 20 parts of polymer polyols, namely polybutylene adipate with a molecular weight between 1000 and 2000, and 5 parts by mass into the drying reactor. 1 part of polyisocyanate compound is isophorone diisocyanate, 10 parts of functional monomer containing epoxy group is allyl glycidyl ether, 0.5 part of trimethylol propane, 4 parts of hydrophilic chain extender is dimethylol The mixture of butyric acid and 2-aminoethyl taurine sodium and 0.05 parts of catalyst dibutyltin diacetate were reacted for 3 hours at 75°C to obtain A;

[0032] 2) Add 2 parts of vinyl monomers containing active hydrogen, ie, hydroxypropyl acrylate, to A in parts by mass for capping, react for 0.5-1 hour, then cool the system temperature to 20-40°C, and then add 5 parts Alkaline salt-forming agent triethylamine, neutralize for 20-30 minutes, then add 50 parts of water, stir and disperse for 10-20 minutes, then raise the temperature to 75°C to ...

Embodiment 3

[0036] 1) Add 15 parts of vinyl monomers, a mixture of butyl methacrylate and hexyl acrylate, and 18 parts of polymer polyols, namely polyethylene glycol with a molecular weight between 1000 and 2000, into the drying reactor in parts by mass. Lactone diol, 8 parts of polyisocyanate compounds, namely a mixture of toluene diisocyanate and diphenylmethane diisocyanate, 15 parts of functional monomers containing epoxy groups, namely γ-(2,3-epoxypropoxy)propyltrimethyl Oxysilane, 0.6 part of trimethylolpropane and 15 parts of hydrophilic chain extender namely dimethylol propionic acid, dimethylol butyric acid and sodium 2-aminoethyl taurine, diaminobenzenesulfonic acid Mixture of sodium, react at 80°C for 3 hours to get A;

[0037] 2) Add 3 parts of vinyl monomers containing active hydrogen, that is, a mixture of methylol acrylamide and acrylic acid, to A in parts by mass for capping, react for 0.5-1 hour, and then cool the system temperature to 20-40°C , and then add 3 parts of a...

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PUM

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Abstract

The invention discloses VOC (volatile organic compound)-free high-solid-content water-borne epoxy PU (polyurethane) primer and a preparation method thereof. A vinyl monomer mixture is used as a dispersion phase, polymer polyol and a polyisocyanate compound are polymerized with trimethylolpropane serving as a self-crosslinking monomer under the action of a carboxyl and sulfonyl mixed hydrophilic chain extender, PU prepolymers capped with the vinyl monomers are obtained through end capping by vinyl monomers containing active hydrogen, after neutralization by an alkaline salt-forming agent, a PU micro-emulsion is obtained through dispersion with water, the polymerization of the vinyl monomers is further triggered under the action of a water-soluble initiator, meanwhile, epoxy functional groups are introduced into the polymer, and the epoxy modified PU-polyacrylate micro-emulsion which is free of VOCs and high in solid content is obtained with an in-situ emulsion polymerization method. Compared with traditional PU primer, the water-borne PU primer is lower in cost and high in curing speed and has excellent adhesive force, alkali resistance, wear resistance, weather resistance and the like.

Description

technical field [0001] The invention relates to a preparation method of a water-based primer, in particular to a VOC-free high-solid-content water-based epoxy polyurethane primer and a preparation method thereof. Background technique [0002] Water-based polyurethane (WPU) coatings combine the advantages of high film hardness, strong adhesion, high wear resistance, and good flexibility of polyurethane (PU) coatings with the low volatile organic compounds (VOC) of water-based coatings. One of the fastest growing coatings. However, WPU coatings still have shortcomings, mainly in terms of hardness, wear resistance and solvent resistance, which are worse than solvent-based PU coatings, slow drying speed and high cost. [0003] In recent years, polyurethane-polyacrylate (PUA), known as the "third-generation polyurethane", has gradually become a hot topic in the coatings industry at home and abroad because of its excellent advantages. PUA not only has the advantages of high film...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D151/08C09D7/00C08F290/06C08G18/83C08G18/67
Inventor 费贵强朱科王海花牟静陈宗明
Owner SHAANXI UNIV OF SCI & TECH
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