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VOC (volatile organic compound)-free epoxy modified water-borne PU (polyurethane) finish paint and preparation method thereof

A water-based polyurethane and epoxy modification technology, which is applied in coatings and other directions, can solve problems affecting the application effect of coatings, environmental pollution, safety hazards, etc., and achieve good decorative and protective functions, high solid content, and improved hardness. Effect

Active Publication Date: 2014-03-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of organic solvents will inevitably affect the application effect of the coating, bring safety hazards, cause environmental pollution, and increase costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a. First, add 40 parts of inert vinyl monomers, 30 parts of polymer polyols, 10 parts of diisocyanate compounds, 5 parts of hydroxyl-containing epoxy monomers, 0.5 parts of trimethylolpropane, 5 parts of hydrophilic chain extender and 0.05 part of catalyst, the reaction temperature is 70°C, and the reaction time is 4 hours;

[0029] b. Next, add 3 parts of vinyl monomers containing active hydrogen for capping, react for 0.5 hours, then cool the system temperature to 50°C, then add 5 parts of alkali salt-forming agent, neutralize for 20 minutes, and then Add 60 parts of water solution, stir and disperse for 20 minutes, then raise the temperature to 70°C;

[0030] c. Then, at a temperature of 70°C, dissolve 0.3 parts of the initiator in 10 parts of water by mass to make an aqueous solution of the initiator, and place the aqueous solution of the initiator and 10 parts of inert vinyl monomers on both sides Evenly drop it into the reactor within 2 hours. After the dropwise ...

Embodiment 2

[0034] a. First, add 25 parts of inert vinyl monomers, 20 parts of polymer polyols, 20 parts of diisocyanate compounds, 0.8 parts of trimethylolpropane, 3 parts of hydrophilic chain extenders and 0.15 parts of Catalyst, reaction temperature is 75 ℃, and reaction time is 3 hours;

[0035]b. Next, add 5 parts of vinyl monomers containing active hydrogen for capping, react for 1 hour, then cool the system temperature to 40°C, then add 3 parts of alkali salt-forming agent, neutralize for 23 minutes, and then Add 120 parts of water solution, stir and disperse for 15 minutes, then raise the temperature to 80°C;

[0036] c. Then, under the condition that the temperature is 80°C, 1 part of initiator is dissolved in 15 parts of water by mass parts to make initiator aqueous solution, and 30 parts of inert vinyl monomers and 10 parts containing Vinyl epoxy functional monomers are mixed to obtain a monomer mixture, and the initiator aqueous solution and the monomer mixture are evenly dro...

Embodiment 3

[0040] a. First, add 60 parts of inert vinyl monomers, 35 parts of polymer polyols, 26 parts of diisocyanate compounds, 15 parts of hydroxyl-containing epoxy monomers, 1 part of trimethylolpropane, 10 parts of hydrophilic chain extender and 0.3 parts of catalyst, the reaction temperature is 80°C, and the reaction time is 2 hours;

[0041] b. Next, add 6 parts of vinyl monomers containing active hydrogen for capping, react for 1 hour, then cool the system temperature to 35°C, then add 2.3 parts of alkali salt-forming agent, neutralize for 26 minutes, and then Add 160 parts of water solution, stir and disperse for 13 minutes, then raise the temperature to 75°C;

[0042] c. Then, under the condition that the temperature is 75°C, 2 parts of initiators are dissolved in 23 parts of water by mass parts to make initiator aqueous solution, and 40 parts of inert vinyl monomers and 20 parts containing Vinyl epoxy functional monomers are mixed to obtain a monomer mixture, and the initiat...

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PUM

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Abstract

The invention discloses VOC (volatile organic compound)-free epoxy modified water-borne PU (polyurethane) finish paint and a preparation method thereof. The finish paint comprises: 1) a host formed by even mixing of 80-95 parts of a high-solid-content epoxy modified PU-polyacrylate micro-emulsion, 0.3-2.5 parts of an assistant and 3-6 parts of dodecanol ester by mass; and 2) a curing agent which is a multi-silicon-hydroxyl or multi-siloxy-group compound with the amount of 10-40% of the mass of the host. The epoxy modified water-borne PU finish paint has excellent gloss uniformity, adhesive force, hardness, transparency, fullness, hand feeling and the like. The PU finish paint is widely applicable to decoration and protection of surfaces of various wood products such as wooden furniture, plywood, solid wood floors and the like.

Description

technical field [0001] The invention relates to a top paint and a preparation method thereof, in particular to a VOC-free epoxy-modified water-based polyurethane top paint and a preparation method thereof. Background technique [0002] Due to its excellent performance, polyurethane coatings have been widely used in wood coatings, architectural coatings, automotive coatings, etc. Although solvent-based polyurethane coatings have excellent performance, they contain a large amount of volatile organic compounds (VOC), which are flammable and cause great pollution to the environment and human body. Water-based polyurethane coatings combine the advantages of strong adhesion, high hardness, abrasion resistance, and chemical resistance of polyurethane coatings with the low VOC content of water-based coatings, and have been widely used in the coatings industry. However, the performance of waterborne polyurethane coatings is still insufficient, mainly in terms of hardness, abrasion r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D151/08C09D7/12C08F290/06C08G18/67C08G18/66
Inventor 费贵强陈宗明王海花牟静朱科
Owner SHAANXI UNIV OF SCI & TECH
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