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Preparation method and application of waterborne polyurea modified epoxy emulsion curing agent

A water-based epoxy resin curing technology, applied in the chemical industry, can solve the problems that it is difficult to achieve the mechanical properties of solvent-based epoxy, chemical corrosion resistance, uneven distribution of resin and curing agent, and the paint film cannot form a network structure, etc. , to achieve the effect of high strength, low cost and superior water resistance

Inactive Publication Date: 2011-12-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the uneven distribution of resin and curing agent, the paint film cannot form an effective continuous network structure, which affects the performance of the paint film.
Therefore, after the second-generation water-based epoxy film is formed, it is difficult to achieve the basic properties of solvent-based epoxy such as mechanical properties and chemical corrosion resistance.

Method used

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  • Preparation method and application of waterborne polyurea modified epoxy emulsion curing agent
  • Preparation method and application of waterborne polyurea modified epoxy emulsion curing agent
  • Preparation method and application of waterborne polyurea modified epoxy emulsion curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Synthesis of polyurea: First add 30g of D2000 to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser and thermometer, stir and slowly add 3.5g of TDI dropwise, react for 5min to obtain polyurea.

[0028] 2. Synthesis of prepolymer: raise the temperature of the above product to 60°C, slowly add 3.4g of E-44 and 0.17g of aqueous diethanolamine dropwise, and react for 2 hours to obtain a prepolymer.

[0029] 3. Synthesis of end-capped products: Add 10.3g of diethylenetriamine to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer and raise the temperature to 60°C, slowly add 20g of epoxy 501 dropwise, and react for 1.5h A capped product was obtained.

[0030] 4. Synthesis of the addition product: 30.3 g of prepolymer was added dropwise to the above-mentioned capped product, and the temperature was 60° C., and the reaction was carried out for 1.5 h to obtain the addition product.

[003...

Embodiment 2

[0038] 1. Synthesis of polyurea: First add 30g of D2000 to a 250mI four-necked flask equipped with a stirrer, electric heating mantle, condenser and thermometer, stir and slowly add 5.2g of MDI dropwise, react for 30min to obtain polyurea.

[0039] 2. Synthesis of prepolymer: heat the above product to 80°C, slowly add 2.3g of E-44 dropwise, and 0.11g of aqueous glycine, and react for 4 hours to obtain a prepolymer.

[0040] 3. Synthesis of end-capped products: Add 10.3g of diethylenetriamine to a 250mI four-necked flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer and raise the temperature to 80°C, slowly add 20g of epoxy 501 dropwise, and react for 2.5h A capped product was obtained.

[0041] 4. Synthesis of the addition product: 15.1 g of prepolymer was added dropwise to the above-mentioned end-capped product, and the temperature was 90° C., and the reaction was carried out for 2.5 hours to obtain the addition product.

[0042] 5. Water-b...

Embodiment 3

[0049] 1. Synthesis of polyurea: First add 30g of D2000 to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser and thermometer, stir and slowly add 1.7g of HDI dropwise, and react for 10min to obtain polyurea.

[0050] 2. Synthesis of prepolymer: heat the above product to 70°C, slowly add 3.4g of E-44 and 0.11g of aqueous diethanolamine dropwise, and react for 3 hours to obtain a prepolymer.

[0051] 3. Synthesis of end-capped products: Add 10.3g of diethylenetriamine to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser and thermometer and raise the temperature to 70°C, slowly add 20g of epoxy 501 dropwise, and react for 2h to obtain capped product.

[0052] 4. Synthesis of the addition product: Add 20 g of prepolymer dropwise to the above-mentioned end-capped product, and react for 2 hours at a temperature of 70° C. to obtain the addition product.

[0053] 5. Water-based polyurea modified epoxy resin curing ag...

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Abstract

The preparation method and application of the water-based polyurea modified epoxy emulsion curing agent of the present invention. In the water-based polyurea modified epoxy resin curing agent, a compound containing a non-ionic hydrophilic segment is introduced into the segment, which improves the brittleness of the cured product film, enhances the compatibility with the epoxy emulsion, and improves the Toughness of the epoxy emulsion, while making the curing agent water-soluble. The polyurea segment is introduced into the epoxy resin to make the cured paint film have superior water resistance, solvent resistance, flexibility, and higher strength, thus possessing the excellent characteristics of polyurea and overcoming the epoxy resin itself. Shortcomings. The curing agent synthesized by this method solves the problems of the first-generation and second-generation curing agents, removes small-molecule active agents and small-molecule polyamines, and improves the compatibility between the curing agent and the emulsion, thereby improving the coating film. Excellent mechanical properties and water resistance.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method and application of a water-based polyurea modified epoxy emulsion curing agent. Background technique [0002] Water-based paints use water as a solvent to disperse film-forming substances evenly in water, also known as water-based paints or latex paints. It has become the main development direction of "environmentally friendly coatings" because of its wide source, easy purification, low cost, low viscosity, good coating adaptability, non-toxicity, non-irritation, and non-combustibility. [0003] Among them, waterborne epoxy coatings have many advantages, such as low VOC, low odor, safe to use, washable with water, etc., and have excellent physical and chemical properties, so they are widely used. However, this coating has not been widely used in China. An important reason is that the curing agent compatible with it still has limitations...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/58C08G18/48C08G59/50C09D163/00
Inventor 刘晓非吴博刘运飞支晓娜
Owner TIANJIN UNIV
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