Waterborne polyurethane modified epoxy resin as well as preparation method and application thereof

A water-based polyurethane and epoxy resin technology, applied in polyurea/polyurethane coatings, coatings, anti-corrosion coatings, etc., can solve the problems of low hydroxyl content, less cross-linking points, paint film flexibility, elongation at break and impact resistance Poor performance and other problems, to achieve the effect of high epoxy equivalent and excellent flexibility

Pending Publication Date: 2022-07-29
韶关东森合成材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydroxyl content of epoxy resin is often low, and there are few crosslinking points available, and the degree of modification is greatly restricted, resulting in poor flexibility, elongation at break and impact resistance of the paint film formulated from it. bad

Method used

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  • Waterborne polyurethane modified epoxy resin as well as preparation method and application thereof
  • Waterborne polyurethane modified epoxy resin as well as preparation method and application thereof
  • Waterborne polyurethane modified epoxy resin as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A water-based polyurethane modified epoxy resin is prepared by reacting the following raw materials:

[0041]

[0042]

[0043] A preparation method of water-based polyurethane modified epoxy resin, comprising the following steps:

[0044] (1) Add the isocyanate monomer TDI into the hydrophilic solvent acetone, heat up to 55°C for the first time, stir, and then add (the same amount each time) polyols (TMP, 1,4-butanediol and polyether polyol), the temperature was raised to 75°C for the second time, and the reaction was carried out to obtain an isocyanate prepolymer and then cooled to 55°C;

[0045] (2) adding hydrophilic modifier dimethylol propionic acid to the isocyanate prepolymer obtained in step (1), heating up to 75° C. for the third time, keeping the temperature for 4 hours, carrying out hydrophilic modification, and cooling to 65° C. ℃ add the neutralizing agent triethylamine to obtain the neutralized product;

[0046] (3) add glycidol in the neutralized...

Embodiment 2

[0048] A water-based polyurethane modified epoxy resin is prepared by reacting the following raw materials:

[0049]

[0050]

[0051] A preparation method of water-based polyurethane modified epoxy resin, comprising the following steps:

[0052](1) Add the isocyanate monomer TDI into the hydrophilic solvent acetone, heat up to 65°C for the first time, stir, and then add (the same amount each time) polyols (TMP, neopentyl glycol, polyether) in three times polyol and polyester polyol), the temperature is raised to 85°C for the second time, and the reaction is carried out to obtain an isocyanate prepolymer and then the temperature is lowered to 65°C;

[0053] (2) adding hydrophilic modifier dimethylol butyric acid to the isocyanate prepolymer obtained in step (1), heating up to 85° C. for the third time, keeping the temperature for 2 hours, carrying out hydrophilic modification, and cooling to 65° C. ℃ add neutralizing agent triethylamine to obtain neutralized product;

...

Embodiment 3

[0056] A water-based polyurethane modified epoxy resin is prepared by reacting the following raw materials:

[0057]

[0058] A preparation method of water-based polyurethane modified epoxy resin, comprising the following steps:

[0059] (1) Heat the isocyanate monomer HDI to 60°C for the first time, stir, and then add (the same amount each time) polyols (TMP, 1,4-butanediol, polyether polyol and polyester in three additions) polyol), the temperature was raised to 80°C for the second time, and the reaction was carried out to obtain an isocyanate prepolymer and then cooled to 60°C;

[0060] (2) adding hydrophilic modifier dimethylol butyric acid to the isocyanate prepolymer obtained in step (1), heating up to 80° C. for the third time, keeping the temperature for 3 hours, carrying out hydrophilic modification, and cooling to 70° C. ℃ add neutralizing agent triethylamine to obtain neutralized product;

[0061] (3) adding glycidol in the neutralized product obtained in step ...

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Abstract

The invention belongs to the technical field of high polymer materials, and particularly discloses waterborne polyurethane modified epoxy resin as well as a preparation method and application thereof. The waterborne polyurethane modified epoxy resin is prepared from the following raw materials: an isocyanate monomer, polyol, a hydrophilic modifier and glycidol. An epoxy group is introduced through glycidyl, the glycidyl is adopted as a monomer to synthesize the polyurethane modified epoxy resin, and during preparation, an isocyanate monomer is firstly adopted and reacts with polyhydric alcohol to prepare an-NCO-containing isocyanate prepolymer; compared with a traditional preparation method, the preparation method has the advantages that the epoxy equivalent of epoxy resin is high, a paint film is endowed with excellent flexibility, elongation at break and impact resistance after curing, the corrosion resistance is equivalent to that of epoxy resin, the flexibility is as low as 1mm, and the adhesive force level is level 1; the elongation at break reaches 88-125%, and the impact resistance is gt; the thickness is 50cm.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an aqueous polyurethane modified epoxy resin and a preparation method and application thereof. Background technique [0002] Epoxy resins are widely used in adhesives, coatings, and other fields due to their excellent chemical resistance, strong adhesion to various substrates, and low cost. However, epoxy resin also has shortcomings such as high internal stress due to high cross-linking density after cross-linking and curing, brittle coating, poor impact resistance, easy cracking and poor moisture and heat resistance, which limit its application fields and application scenarios. [0003] Polyurethane has good physical and chemical properties, and its excellent flexibility endows the coating with good cold resistance, tensile strength, high gloss and fullness, and resistance to organic solvents. Therefore, the epoxy resin can be modified with polyurethane to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/73C08G18/66C08G18/48C08G18/42C08G18/28C08G18/12C09D175/08C09D175/04C09D5/08
CPCC08G18/7621C08G18/73C08G18/6692C08G18/12C08G18/2845C08G18/4018C08G18/4825C08G18/42C09D175/08C09D175/04C09D5/08C08G18/348
Inventor 周俊锋
Owner 韶关东森合成材料有限公司
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