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Polyurethane-urea modified self-emulsifying nanometer waterborne epoxy emulsion and preparation method thereof

A water-based epoxy emulsion and polyurethane technology, which is applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of long modification curing time and unfavorable spraying construction, etc., to improve curing time, improve corrosion resistance, and good stability sexual effect

Active Publication Date: 2013-07-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the use of polyurethane-modified epoxy resin in oily systems has emerged endlessly, and it has also begun to be applied in water-based systems, which can improve the brittleness of epoxy and increase toughness. However, simple polyurethane modification takes a long time to cure, which is not conducive to spraying construction. Therefore, needs to be improved

Method used

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  • Polyurethane-urea modified self-emulsifying nanometer waterborne epoxy emulsion and preparation method thereof
  • Polyurethane-urea modified self-emulsifying nanometer waterborne epoxy emulsion and preparation method thereof
  • Polyurethane-urea modified self-emulsifying nanometer waterborne epoxy emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Synthesis of modified epoxy resin: first add 13.6g of epoxy resin E-44 to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, raise the temperature to 50°C, and slowly add 23.1g of D2000 dropwise The mixture with PEG1000 is heated to 80°C and reacted for 4 hours to obtain a modified epoxy resin.

[0024] 2. Synthesis of prepolymer: the above reaction system was cooled to 50°C, 1.7g of TDI was slowly added dropwise, and reacted for 1 hour to obtain an epoxy prepolymer.

[0025] 3. Mix 4g of the epoxy resin prepolymer obtained above with 40g of E-44, react at 60°C for 1 hour, and take it out from the reaction vessel.

[0026] 4. The above product was dispersed at a high speed of 1000r / min, and 110g of distilled water was added dropwise to obtain a polyurea-modified epoxy resin emulsion.

[0027] 5. Disperse the above emulsion for 30 minutes through a vertical colloid mill at 2500 r / min, and then use a nano homogeni...

Embodiment 2

[0030] 1. Synthesis of modified epoxy resin: first add 4.5g of epoxy resin E-44 to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, raise the temperature to 60°C, and slowly add 23.1g of D2000 dropwise The mixture with PEG4000 is heated to 100°C and reacted for 6 hours to obtain a modified epoxy resin.

[0031] 2. Synthesis of prepolymer: the above reaction system was cooled to 70°C, 2.6g of MDI was slowly added dropwise, and reacted for 2 hours to obtain an epoxy prepolymer.

[0032] 3. Mix 4g of the epoxy resin prepolymer obtained above with 20g of E-44, react at 90°C for 3h, and take it out from the reaction vessel.

[0033] 4. The above product was dispersed at a high speed of 1000r / min, and 48g of distilled water was added dropwise to obtain a polyurea-modified epoxy resin emulsion.

[0034] 5. Disperse the above emulsion for 1.5 hours in a vertical colloid mill at 3500r / min, and then use a nano homogenizer to emul...

Embodiment 3

[0037] 1. Synthesis of modified epoxy resin: First add 13.6g of epoxy resin E-44 to a 250mI four-neck flask equipped with a stirrer, electric heating mantle, condenser tube and thermometer, raise the temperature to 55°C, and slowly add 23.1g dropwise The mixture of D2000 and PEG4000 was heated to 90°C and reacted for 5 hours to obtain a modified epoxy resin.

[0038] 2. Synthesis of prepolymer: the temperature of the above reaction system was lowered to 60°C, 1.7g HDI was slowly added dropwise, and the epoxy prepolymer was obtained by reacting for 1.5h.

[0039] 3. Mix 4g of the epoxy resin prepolymer obtained above with 40g of E-44, react at 70°C for 2h, and take it out from the reaction vessel.

[0040] 4. The above product was dispersed at a high speed of 1000r / min, and 88g of distilled water was added dropwise to obtain a polyurea-modified epoxy resin emulsion.

[0041] 5. Put the above emulsion through a vertical colloid mill at 2500r / min, disperse for 1h, and then use a...

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Abstract

The invention relates to polyurethane-urea modified self-emulsifying nanometer waterborne epoxy emulsion and a preparation method thereof. The emulsion has solid content of 40-50%, an average particle size of less than 500nm and a viscosity of 500-650(mPa*S). A chain segment in the self-emulsifying nanometer waterborne emulsion of the invention is introduced with a compound containing a nonionic hydrophilic chain segment, so that epoxy resin can have a self-emulsifying property, and the corrosion resistance and curing time of a coating can be improved by the polyurethane-urea based chain segment.A water dispersion system formed by the modified epoxy resin is then subjected to high pressure emulsification by a homogenizer and the particle size is dispersed to a nanoscale, and after a long time storage, physicochemical properties change little. Thus, the emulsion of the invention has good stability. The synthesis process of the method provided in the invention adds no organic solvent and has simple operation, thus being easy to realize.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a polyurethane-urea modified self-emulsifying nano water-based epoxy emulsion and a preparation method thereof. Background technique [0002] In recent years, epoxy resin coatings, especially water-based epoxy resin coatings and nano-modified epoxy resin coatings, have developed rapidly. Epoxy resins have been attracting attention because of their excellent physical and chemical properties, such as good adhesion, excellent chemical and solvent resistance, high hardness, corrosion resistance, and thermal stability. Generally, solvent-based epoxy resin coatings contain organic volatile solvents. These organic solvents enter the atmosphere due to solvent volatilization during the production and construction stages of coatings, causing pollution to the environment and endangering human health. Compared with solvent-based coatings, water-based epoxy coatings hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/65C08G18/58C08G18/10C08G59/62C08G59/50C08J3/03C09D175/04
Inventor 刘晓非吴博刘运飞支晓娜
Owner TIANJIN UNIV
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