Polyurea-modified self-emulsifying nano aqueous epoxy emulsion and preparation method thereof

A water-based epoxy emulsion, self-emulsification technology, applied in the chemical industry, can solve the problem that the sexual system is still in its infancy, Nanjing University, organic solvents are not conducive to environmental protection, etc., and achieve the effect of easy implementation, good stability and simple operation

Active Publication Date: 2013-07-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the research on the use of polyurethane modified epoxy resin in oily systems emerges endlessly, and it has also begun to appear in water-based systems in recent years; but the research on using polyurea elastomers to modify epoxy resins in oily systems is still in its infancy. Ji Shi from Nanjing University etc., using polyurea-modified epoxy resin adhesives to improve toughness and high temperature resistance, but a large amount of organic solvents are left, which is not conducive to environmental protection; research on this aspect of water-based systems has not been reported

Method used

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  • Polyurea-modified self-emulsifying nano aqueous epoxy emulsion and preparation method thereof
  • Polyurea-modified self-emulsifying nano aqueous epoxy emulsion and preparation method thereof
  • Polyurea-modified self-emulsifying nano aqueous epoxy emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 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 diethanolamine is heated to 80°C and reacted for 4 hours to obtain a modified epoxy resin.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 5. Disperse the above emulsion for 30 minutes under the condition of a vertical colloid mill at 2500 r / min, and th...

Embodiment 2

[0029] 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 diethanolamine is heated to 100°C and reacted for 6 hours to obtain a modified epoxy resin.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 5. Disperse the above emulsion for 1.5 hours in a vertical colloid mill at 3500r / min, and then use a nano homogenizer ...

Embodiment 3

[0036] 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 diethanolamine was heated up to 90°C and reacted for 5 hours to obtain a modified epoxy resin.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 5. Put the above emulsion through a vertical colloid mill at 2500r / min, disperse for 1h, and ...

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Abstract

The invention relates to a polyurea-modified self-emulsifying nano aqueous epoxy emulsion and a preparation method thereof. The solid content of the emulsion is 40-50 percent, the average particle diameter is less than 500 nanometers, and the viscosity is 400-600 (mPa.s). In the self-emulsifying nano aqueous emulsion provided by the invention, a compound containing a non-ionic hydrophilic chain segment is introduced into a chain segment, so that epoxy resin has self-emulsifying performance; and a water dispersion system formed by modified epoxy resin is emulsified under high pressure through a homogenizer, so that the dispersion particle diameter is up to nanometer grade, the physicochemical properties do not change remarkably during long-time storage, and high stability is achieved. No organic solvent is added in the synthesizing process of the method; the polyurea-modified self-emulsifying nano aqueous epoxy emulsion is an environmentally-friendly dope; and moreover, the method is easy to operate and implement.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for polyurea-modified self-emulsifying nanometer water-based epoxy emulsion. Background technique [0002] In recent years, with the development of the world economy and science and technology, the whole world is paying attention to the use of non-toxic, non-polluting and environmentally friendly coatings. Among them, water-based coatings are non-flammable, non-toxic, and tasteless, and do not require special construction equipment during construction. It is favored by people because it does not need to be heated and solidified, the equipment is easy to clean, there is no problem of solvent emission and disposal, it has a wide range of applications, many application occasions, and the use of cheap water instead of expensive organic solvents. [0003] Among water-based coatings, water-based epoxy coatings have many advantages, such as low VOC, less o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/03C08G59/14C08G18/58C08L63/00
Inventor 刘晓非吴博刘运飞支晓娜
Owner TIANJIN UNIV
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