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Epoxy resin modified water-based polyurethane emulsion and preparation method thereof

A technology of water-based polyurethane and epoxy resin, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor water resistance of water-based polyurethane coating films, achieve excellent yellowing resistance and temperature resistance, and are not easy to decompose or Effect of yellowing and excellent mechanical properties

Inactive Publication Date: 2010-06-02
SHANGHAI WEIKAI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the predecessors used epoxy resin to replace the soft segment for modification, but the water-based polyurethane coating film prepared by this method has poor water resistance

Method used

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  • Epoxy resin modified water-based polyurethane emulsion and preparation method thereof
  • Epoxy resin modified water-based polyurethane emulsion and preparation method thereof

Examples

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Effect test

Embodiment 1

[0044] A kind of preparation method of the aqueous polyurethane emulsion of epoxy resin modification, this method comprises the following steps:

[0045] (1) Material preparation:

[0046] Prepare raw materials according to the following components and weight: 20g isophorone diisocyanate, 20g commercially available polyester 210N, 5g hydrophilic chain extender dihydroxypropionic acid, 5g chain extender isophorone diamine, 1g crosslinking agent Trimethylolpropane, 3.77g neutralizer triethylamine, 1g commercially available epoxy resin E-44, 15g acetone (20ml);

[0047] (2) Preparation of prepolymer:

[0048] Add polyester 210N into a three-necked flask, heat it up to 130°C under vacuum, remove water for 1 hour, then cool down to 80°C, add isophorone diisocyanate into the flask, react for 2 hours, then add dihydroxypropionic acid and trimethylol base propane, continue to react for 1h, then lower the temperature to 50°C, dissolve epoxy resin E-44 in 14.5ml acetone, add it to a t...

Embodiment 2

[0052] A kind of preparation method of the aqueous polyurethane emulsion of epoxy resin modification, this method comprises the following steps:

[0053] (1) Material preparation:

[0054] Prepare raw materials according to the following components and weight: 20g isophorone diisocyanate, 20g commercially available polyester 210N, 5g hydrophilic chain extender dihydroxypropionic acid, 5g chain extender isophorone diamine, 1g crosslinking agent Trimethylolpropane, 3.32g neutralizing agent N, N-dimethylethanolamine, 1g commercially available epoxy resin E-44, 15g acetone (20ml);

[0055] (2) Preparation of prepolymer:

[0056] Add polyester 210N into a three-necked flask, heat it up to 130°C under vacuum, remove water for 1 hour, then cool down to 80°C, add isophorone diisocyanate into the flask, react for 1 hour, then add dihydroxypropionic acid and trimethylol propane, continue to react for 1h, then lower the temperature to 40°C, dissolve epoxy resin E-44 in 14ml of acetone,...

Embodiment 3

[0060] A kind of preparation method of the aqueous polyurethane emulsion of epoxy resin modification, this method comprises the following steps:

[0061] (1) Material preparation:

[0062] Prepare raw materials according to the following components and weight: 20g isophorone diisocyanate, 20g commercially available polyester 210N, 5g hydrophilic chain extender dihydroxypropionic acid, 5g chain extender ethylene glycol, 1g crosslinking agent III Methylolpropane, 3.77g neutralizer triethylamine, 1g commercially available epoxy resin E-44, 10g acetone (11ml);

[0063] (2) Preparation of prepolymer:

[0064] Add polyester 210N into a three-necked flask, heat it up to 130°C under vacuum, remove water for 1 hour, then cool down to 80°C, add isophorone diisocyanate into the flask, react for 1 hour, then add dihydroxypropionic acid and trimethylol base propane, continue to react for 1h, then lower the temperature to 40°C, dissolve epoxy resin E-44 in 10ml acetone, add it to the three-...

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Abstract

The invention relates to an epoxy resin modified water-based polyurethane emulsion and a preparation method thereof. The emulsion comprises the following components in percentage by weight: 20 to 40 percent of isophorone diisocyanate, 20 to 40 percent of polyester, 5 to 10 percent of hydrophilic chain extender, 2 to 10 percent of chain extender, 1 to 3 percent of crosslinker, 3 to 10 percent of neutralizing agent, 2 to 10 percent of epoxy resin and 10 to 20 percent of acetone. The preparation method comprises the steps of feed preparation, polyester dehydration, the synthesis and neutralization of prepolymer, and chain extension and emulsification. Compared with the prior art, the epoxy resin modified water-based polyurethane emulsion has the advantages of high hardness of film, good water resistance and solvent resistance and the like, and is widely applied in the field of packaging coatings.

Description

technical field [0001] The invention relates to an emulsion and a preparation method thereof, in particular to an epoxy resin modified water-based polyurethane emulsion and a preparation method thereof. Background technique [0002] Because water-based polyurethane uses water as the dispersion medium, it not only has the advantages of non-toxic, non-flammable, non-polluting, energy-saving, safe and reliable, etc., so water-based polyurethane coatings have gained widespread attention in recent years. At present, this kind of polymer aqueous dispersion is mainly prepared by self-emulsification method, so the water resistance and solvent resistance of the coating film are poor, and the use in certain fields is limited. [0003] In recent years, the modification of waterborne polyurethane has become a research hotspot in this field. The linear thermoplastic waterborne polyurethane coating film has poor chemical resistance and solvent resistance, low hardness, low surface gloss,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/58C08G18/42C08G18/12C08J3/03C09D175/06
Inventor 董海普戴炜枫邓庆仪刘杰朱先义
Owner SHANGHAI WEIKAI CHEM
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