A kind of epoxy modified polyurethane emulsion and preparation method thereof

A polyurethane emulsion and epoxy modification technology, which is applied in the field of chemical engineering, can solve the problems of high reaction temperature and difficult preparation, and achieve high and low temperature stability and good mechanical stability

Active Publication Date: 2016-03-16
QINGDAO ADVANCED MARINE MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses UV action, and the reaction temperature is high, making it difficult to prepare

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of preparation of epoxy-modified polyurethane emulsion, prepare prepolymer according to following mass ratio: polypropylene glycol 2110:25g, polypropylene glycol 2120:30g, isophorone diisocyanate: 32g, dibutyltin dilaurate: 0.04g, epoxy resin E-44: 4g, dimethylolpropionic acid: 4g, nitrogen methylpyrrolidone: 20g, acetone: 20g, triethylamine: 4g. The emulsion was prepared according to the following mass ratio: prepolymer: 50g, deionized water: 200g.

[0034] The preparation method of this embodiment is:

[0035] Preparation of A prepolymer: first add polypropylene glycol 2110, polypropylene glycol 2120, isophorone diisocyanate and 2 / 3 mass catalyst into the reactor, slowly heat up to 60°C under nitrogen protection, and control the temperature to 75°C React for 4∽5 hours until NCO% reaches the theoretical value; add epoxy resin, add 1 / 3 mass of catalyst and continue to react under nitrogen protection at 75°C for 2∽3 hours until NCO% reaches the theoretical value;...

Embodiment 2

[0040] A kind of preparation of epoxy-modified polyurethane emulsion, prepare prepolymer according to following mass ratio: polypropylene glycol 2110:21g, polypropylene glycol 2120:30g, isophorone diisocyanate: 31g, stannous octoate: 0.04g, ring Oxygen resin E-44: 8g, dimethylol propionic acid: 5g, nitrogen methyl pyrrolidone 20g, acetone: 30g, triethylamine: 6g. The emulsion was prepared according to the following mass ratio: prepolymer: 50g, deionized water: 200g.

[0041] The preparation method of this embodiment is:

[0042] Preparation of A prepolymer: first add polypropylene glycol 2110, polypropylene glycol 2120, isophorone diisocyanate and 2 / 3 mass catalyst into the reactor, slowly heat up to 60°C under nitrogen protection, and control the temperature to 75°C React for 4∽5 hours until NCO% reaches the theoretical value; add epoxy resin, add 1 / 3 mass of catalyst and continue to react under nitrogen protection at 85°C for 2∽3 hours until NCO% reaches the theoretical val...

Embodiment 3

[0047] A kind of preparation of epoxy-modified polyurethane emulsion, prepare prepolymer according to following mass ratio: polypropylene glycol 2110:25g, polypropylene glycol 2120:33g, isophorone diisocyanate: 34g, di-n-butyltin dilaurate: 0.04 g, epoxy resin E-44: 6g, dimethylolpropionic acid: 6g, nitrogen methyl pyrrolidone 25g, acetone: 30g, triethylamine: 4g. The emulsion was prepared according to the following mass ratio: prepolymer: 50g, deionized water: 200g.

[0048] The preparation method of this embodiment is:

[0049]Preparation of A prepolymer: first add polypropylene glycol 2110, polypropylene glycol 2120, isophorone diisocyanate and 2 / 3 mass catalyst into the reactor, slowly heat up to 60°C under nitrogen protection, and control the temperature to 75°C React for 4∽5 hours until NCO% reaches the theoretical value; add epoxy resin, add 1 / 3 mass of catalyst and continue to react under nitrogen protection at 85°C for 2∽3 hours until NCO% reaches the theoretical val...

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Abstract

The invention discloses an epoxy modified polyurethane emulsion and a preparation method thereof. The epoxy modified polyurethane emulsion comprises a prepolymer and deionized water, wherein the prepolymer comprises the following substances in parts by weight; the parts by weight of the deionized water is 3-5 times more than the total weight of the prepolymer. The preparation method comprises the following steps of: (1) firstly adding polypropylene glycol, isophorone diisocyanate and tin catalysts to a reaction kettle; (2) adding epoxide resin and a trace amount of the tin catalysts, and then continuously reacting till NCO% achieves a theoretical value; (3) adding dimethylolpropionic acid, and reacting till NCO% achieves the theoretical value; (4) adding acetone to regulate viscosity, and then adding triethylamine to obtain an epoxy modified polyurethane prepolymer; (5) slowly adding deionized water for emulsification to obtain the epoxy modified polyurethane emulsion. The emulsion prepared through the method disclosed by the invention has the advantages of smaller granule, uniformity in granule size distribution, good film-forming property and better high-low temperature stability and mechanical stability.

Description

technical field [0001] The invention relates to an epoxy-modified polyurethane emulsion and a preparation method thereof, belonging to the technical field of chemical engineering. Background technique [0002] There are many preparations for polyurethane emulsions. The preparation process mainly has two steps. First, the first step is to use the prepolymer method to prepare a part of the isocyanate-terminated prepolymer by reacting polyether or polyester polyol with isocyanate. Then The second step adopts the emulsification method to emulsify the prepolymer in water to prepare water-based polyurethane emulsion. [0003] Patent No.: 201310193324.7, also clearly announced a preparation method of water-based epoxy-modified polyurethane emulsion. However, this method uses UV action, and the reaction temperature is relatively high, so the preparation is difficult. The present invention refers to the preparation method of polyurethane emulsion, adding epoxy resin to the pre-reac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/48C08G18/58C08G18/34
CPCC08G18/12C08G18/348C08G18/58C08G18/6692
Inventor 李国英胡松霞刘培礼刘连河毛志鹏
Owner QINGDAO ADVANCED MARINE MATERIAL TECH
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