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Waterborne polyurethane emulsion modified by epoxy resin and preparation method thereof

A water-based polyurethane and epoxy resin technology, applied in the field of water-based coatings, can solve the problems of poor water resistance, poor stability, and poor solvent resistance of water-based polyurethane, and achieve the effect of improving water resistance, improving related properties, and avoiding water resistance decline.

Inactive Publication Date: 2015-12-23
SKSHU PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides an epoxy resin modified water-based polyurethane emulsion and a preparation method thereof, which solves technical problems such as poor water resistance, poor solvent resistance and poor stability of water-based polyurethane

Method used

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  • Waterborne polyurethane emulsion modified by epoxy resin and preparation method thereof
  • Waterborne polyurethane emulsion modified by epoxy resin and preparation method thereof
  • Waterborne polyurethane emulsion modified by epoxy resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0034] A water-based polyurethane emulsion modified by epoxy resin, which is formulated by the following components in parts by weight:

[0035]

[0036] A kind of preparation of the aqueous polyurethane emulsion of epoxy resin modification, it is characterized in that: it is prepared according to the following steps carried out in order by the raw material of following weight ratio:

[0037] 1) Preparation of polyurethane prepolymer:

[0038] Add 24.00-26.00 parts of polyester polyol and 25.36-30.18 parts of isophorone diisocyanate into the reactor, heat to 80-85 ° C under the stirring speed of 300-500 rpm and nitrogen protection, and react until the measured -NCO The content reaches the theoretical value;

[0039] The reaction equation of step 1) is shown in the following formula

[0040]

[0041] 2) Epoxy resin modified polyurethane prepolymer:

[0042] Then, keep the above speed and temperature, add 42.00-46.00 parts of diluent to adjust the viscosity of the syste...

Embodiment 1

[0050]A water-based polyurethane emulsion modified by epoxy resin, which is formulated by the following components in parts by weight:

[0051]

[0052] A kind of preparation of the aqueous polyurethane emulsion of epoxy resin modification, it is prepared from by the following steps that the raw material of following weight ratio carries out in order:

[0053] 1) Preparation of polyurethane prepolymer:

[0054] Add 24.00 parts of polyester polyol and 25.36 parts of isophorone diisocyanate into a 500mL four-necked flask equipped with a stirrer, thermometer, and condenser tube, heat to 80°C at a stirring speed of 300rpm and under nitrogen protection, and react to the The measured -NCO content reached the theoretical value (16.94%).

[0055] The reaction equation is as follows:

[0056]

[0057] 2) Epoxy resin modified polyurethane prepolymer:

[0058] In the above reaction system, add 42 parts of diluent to adjust the viscosity of the system, then add 4 parts of hydroph...

Embodiment 2

[0064] A water-based polyurethane emulsion modified by epoxy resin, which is formulated by the following components in parts by weight:

[0065]

[0066]

[0067] A kind of preparation of the aqueous polyurethane emulsion of epoxy resin modification, it is prepared from by the following steps that the raw material of following weight ratio carries out in order:

[0068] 1) Preparation of polyurethane prepolymer:

[0069] Add 26 parts of polyester polyol and 30.18 parts of isophorone diisocyanate into a 500mL four-necked flask equipped with a stirrer, thermometer, and condenser tube, heat to 85°C at a stirring speed of 500rpm and under nitrogen protection, and react to the The measured -NCO content reached the theoretical value (18.76%).

[0070] The reaction equation is as follows:

[0071]

[0072] 2) Epoxy resin modified polyurethane prepolymer:

[0073] In the reaction system, add 46 parts of diluent to adjust the viscosity of the system, then add 5 parts of hyd...

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Abstract

The invention relates to waterborne polyurethane emulsion modified by epoxy resin and a preparation method thereof. The waterborne polyurethane emulsion is prepared from polyester polyol, isophorone diisocyanate, diluent, a hydrophilic chain-extending agent, the epoxy resin, dihydric alcohol, dibutyltin dilaurate, a neutralizing agent, water and ethidene diamine. The waterborne polyurethane emulsion has the following advantages that the problem that water resistance is lowered due to addition of emulsifier is solved; the product is of a compact network structure, and the water resistance, the mechanical property and the thermal property of a waterborne polyurethane adhesive film can be improved.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to an epoxy resin-modified water-based polyurethane emulsion and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the global economy and industry, a large amount of volatile organic substances are produced, causing serious pollution to the atmosphere. The organic substances released by paint during its generation and use are only behind cars, and it is a serious source of air pollution in cities. Therefore, almost all technicians in the coating industry are paying attention to the content of solvents and the research and development of solvent-free coatings. Water-based paint, as a paint that uses water as a solvent, has long been recognized by people. Various water-based coatings have also come out one after another and are quickly accepted by the market. [0003] Polyurethane has the advantages of low film f...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/42C08G18/58C08G18/32C08G18/34C08G18/08
CPCC08G18/755C08G18/0823C08G18/3206C08G18/348C08G18/4045C08G18/42C08G18/581C08G18/664C08G18/6659
Inventor 洪杰王艳
Owner SKSHU PAINT
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