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Epoxy-terminated waterborne polyurethane resin and preparation method thereof

A water-based polyurethane and epoxy-terminated technology, used in polyurea/polyurethane coatings, coatings, etc., to achieve the effect of low price and renewable raw materials

Active Publication Date: 2016-01-06
中山大桥化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no water-based epoxy resin with good flexibility on the market. It is of great significance to develop a water-based epoxy resin with good flexibility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1, put 100 grams of acetone, 398 grams of soybean oil polyol, 40.5 grams of 1,4-butanediol, 37.4 grams of dimethylol propionic acid, and 222 grams of isophorone diisocyanate into the reactor, and heat up to Dissolve the material at 60°C, add 1.4 g of dibutyltin dilaurate catalyst, heat up to 70°C and react for 3 hours to obtain an isocyanate-terminated polyurethane prepolymer.

[0022] Step 2: Add 11.8 grams of 2,3-epoxy-1-propanol to the obtained isocyanate-terminated polyurethane prepolymer into the reactor, and react at 60° C. for 4 hours to obtain a brown-yellow epoxy-terminated polyurethane resin;

[0023] Step 3, maintain the reaction temperature at 60°C, add 21 grams of N,N-dimethylethanolamine dropwise to the reactor for neutralization, after neutralization, add 990 grams of deionized water to the reactor for phase inversion in 2 hours , after 1 hour of heat preservation, the temperature was raised to 80° C., and the acetone was distilled off under reduced ...

Embodiment 2

[0025] Step 1, put 85 grams of acetone, 334 grams of castor oil polyol, 24.1 grams of trimethylolpropane, 26.5 grams of dimethylol propionic acid, and 174 grams of toluene diisocyanate into the reactor, and heat up to 60°C to dissolve the materials , adding 1.1 g of dibutyltin dilaurate catalyst, raising the temperature to 70°C and reacting for 3 hours to obtain an isocyanate-terminated polyurethane prepolymer.

[0026] Step 2: Add 6.7 grams of 2,3-epoxy-1-propanol to the obtained isocyanate-terminated polyurethane prepolymer into the reactor, and react at 60° C. for 4 hours to obtain a brown-yellow epoxy-terminated polyurethane resin;

[0027] Step 3, maintain the reaction temperature at 60°C, add 15 grams of N,N-dimethylethanolamine dropwise to the reactor for neutralization, after neutralization, add 820 grams of deionized water to the reactor for phase inversion in 2 hours , after 1 hour of heat preservation, the temperature was raised to 80° C., and the acetone was distil...

Embodiment 3

[0029] Step 1, put 90 grams of acetone, 353 grams of palm oil polyol, 13.6 grams of ethylene glycol, 27.9 grams of dimethylol propionic acid, and 168 grams of hexamethylene diisocyanate into the reactor, and heat up to 60°C to make the materials Dissolve, add 1.1 g of dibutyltin dilaurate catalyst, heat up to 70° C. and react for 3 hours to obtain isocyanate-terminated polyurethane prepolymer.

[0030] Step 2: Add 8.7 grams of 2,3-epoxy-1-propanol to the obtained isocyanate-terminated polyurethane prepolymer into the reactor, and react at 60° C. for 4 hours to obtain a brown-yellow epoxy-terminated polyurethane resin;

[0031] Step 3: Maintain the reaction temperature at 60°C, add 16 grams of N,N-dimethylethanolamine dropwise to the reactor for neutralization, after neutralization, add 820 grams of deionized water to the reactor for phase inversion in 2 hours , after 1 hour of heat preservation, the temperature was raised to 80° C., and the acetone was distilled off under redu...

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Abstract

The invention discloses epoxy-terminated waterborne polyurethane resin and a preparation method thereof. The resin is prepared in the following steps that vegetable oil polyhydric alcohols, small molecular polyhydric alcohols, diisocyanate and a hydrophilic chain-extending agent are contained in organic solvent, and an isocyanate-terminated polyurethane prepolymer is obtained through an addition reaction under the action of a catalyst; a hydroxyl-terminated epoxy compound is added for reacting, and epoxy-terminated polyurethane is obtained; then amine is added for neutralizing, water is dripped for conducting phase reversal, heat preservation is performed, the organic solvent is removed through reduced pressure distillation, and accordingly the epoxy-terminated waterborne polyurethane resin is obtained. The resin is water-based paint, no volatile organic pollutants exist, and environmental friendliness is achieved. The epoxy-terminated waterborne polyurethane resin is prepared from combining the polyurethane and the epoxy resin through a chemical method, and the resin not only has the flexibility of the polyurethane but also has the advantages of rigidity and cohesiveness of the epoxy resin. The vegetable oil polyhydric alcohols are adopted as the raw materials, and the method has advantages of being low in price, environmentally friendly, capable of regenerating raw materials and the like compared with a traditional mode that a petrochemical engineering dihydric alcohol product is used as the raw material.

Description

technical field [0001] The invention relates to the field of epoxy resins, in particular to an epoxy-terminated waterborne polyurethane resin and a preparation method thereof. Background technique [0002] Epoxy resin has good adhesion, mechanical strength, electrical insulation and other properties, so it is widely used in various industrial fields of the national economy. However, the traditional epoxy resin contains a large number of aromatic ring structures, its glass transition temperature is high, it is brittle, and its impact resistance is poor, so its application is limited to a certain extent, and it is difficult to meet the increasingly stringent requirements of many engineering technologies. For example, the epoxy resin used in concrete coatings needs to have good ductility to ensure its crack followability and achieve effective protection of concrete. Therefore, how to improve the flexibility of epoxy resin has become an important research direction of epoxy res...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/36C08G18/32C08G18/34C08G18/30C08G18/12C09D175/04
CPCC08G18/0823C08G18/12C08G18/2845C08G18/3206C08G18/348C08G18/36C08G18/755C09D175/04
Inventor 王明晶吕诚业张新宇陈开强于学亚
Owner 中山大桥化工集团有限公司
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