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Waterborne polyurethane resin emulsion and preparation method thereof

A water-based polyurethane and resin emulsion technology, applied in the field of polymer synthesis, can solve the problems of difficult water-based polyurethane resin, poor film-forming performance, and film stickiness, avoiding the use of additives, fast film-forming rate, and low cost. Effect

Pending Publication Date: 2022-02-22
SHANGHAI MINGBANG RUBBER PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the water-based polyurethane emulsion prepared by the prepolymer method generally has poor film-forming performance when the film is formed in the later stage. Polyurethane resin is difficult to be applied in industry and daily life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 78 parts of polyols (polytetrahydrofuran ether polyol-2500 and polycarbonate polyol-1000) were vacuum dehydrated at a temperature of 110°C for 120 min, and the weight ratio of polyester polyol to polyether polyol in the polyol was 0.36 ; After lowering the temperature to 85°C, add 16 parts of isophorone diisocyanate and 0.03 parts of catalyst bismuth neodecanoate, and prepolymerize for 150 min under the protection of inert gas (nitrogen); add 2.08 parts of the first The second type of chain extender, diethylene glycol, was reacted for 90 min; when the temperature dropped to 65°C, 1.55 parts of the second type of chain extender, isophoronediamine, was added and reacted for 30 min; The temperature was raised to 85°C, and 2.37 parts of hydrophilic chain extender dimethylolbutyric acid was added, and the reaction was carried out for 120 min; then the temperature was lowered to 35°C, and a salt-forming agent triethylamine was added in an equimolar amount to that of the hydrop...

Embodiment 2

[0039] 78 parts of polyols (polytetrahydrofuran ether polyol-2500 and polycarbonate polyol-1000) were vacuum dehydrated at a temperature of 110°C for 120 min, and the weight ratio of polyester polyol to polyether polyol in the polyol was 0.48 ; After lowering the temperature to 85°C, add 16 parts of isophorone diisocyanate and 0.03 parts of catalyst bismuth neodecanoate, and prepolymerize for 150 min under the protection of inert gas (nitrogen); add 2.08 parts of the first The second type of chain extender, diethylene glycol, was reacted for 90 min; when the temperature dropped to 65°C, 1.55 parts of the second type of chain extender, isophoronediamine, was added and reacted for 30 min; The temperature was raised to 85°C, and 2.37 parts of hydrophilic chain extender dimethylolbutyric acid was added, and the reaction was carried out for 120 min; then the temperature was lowered to 35°C, and a salt-forming agent triethylamine was added in an equimolar amount to that of the hydrop...

Embodiment 3

[0041] 78 parts of polyols (polytetrahydrofuran ether polyol-2500 and polycarbonate polyol-1000) were vacuum dehydrated at a temperature of 110°C for 120 min, and the weight ratio of polyester polyol to polyether polyol in the polyol was 0.62 ; After lowering the temperature to 85°C, add 16 parts of isophorone diisocyanate and 0.03 parts of catalyst bismuth neodecanoate, and prepolymerize for 150 min under the protection of inert gas (nitrogen); add 2.08 parts of the first The second type of chain extender, diethylene glycol, was reacted for 90 min; when the temperature dropped to 65°C, 1.55 parts of the second type of chain extender, isophoronediamine, was added and reacted for 30 min; The temperature was raised to 85°C, and 2.37 parts of hydrophilic chain extender dimethylolbutyric acid was added, and the reaction was carried out for 120 min; then the temperature was lowered to 35°C, and a salt-forming agent triethylamine was added in an equimolar amount to that of the hydrop...

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Abstract

The invention belongs to the technical field of polymer synthesis, and particularly relates to a waterborne polyurethane emulsion and a preparation method thereof. The water-based polyurethane-containing emulsion is prepared from the following raw materials in parts by weight: 50-80 parts of mixed polyol which is composed of polyester and polyether polyol in a weight ratio of 0.3-0.7, 10-40 parts of isocyanate, 1-3 parts of a hydrophilic chain extender, 1-6 parts of a first-type alcohol chain extender, 1-6 parts of a second-type chain extender, 0.01-0.05 part of a catalyst and 1-3 parts of a salt-forming agent. The waterborne polyurethane emulsion with a solid content of 30-45% is prepared by adjusting the weight ratio of the polyester to the polyether polyol in the polyol while the excellent mechanical property and chemical property of the polyurethane resin are not influenced; and the emulsion not only has good stability, but also has higher tensile strength and excellent film-forming property, so the waterborne polyurethane emulsion can be widely applied to the fields of coatings, printing ink, adhesives and life health products.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis, and in particular relates to a water-based polyurethane emulsion and a preparation method. Background technique [0002] Waterborne polyurethane is an environmentally friendly resin material with low or zero VOC emissions. It is widely used in leather, textile, coating and other industrial fields because of its good physical and chemical properties. However, at present, the water-based polyurethane emulsion prepared by the prepolymer method generally has poor film-forming performance when the film is formed in the later stage. Polyurethane resins are difficult to be applied in the fields of industry and daily life. For this reason, people often improve the film-forming performance of water-based polyurethane emulsion by adding additives to water-based resin emulsion. [0003] In order to solve the defects in the later application of the above-mentioned water-based polyurethane emulsio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/48C08G18/44C08G18/40C08G18/12C08G18/32C08G18/34
CPCC08G18/755C08G18/4854C08G18/44C08G18/4018C08G18/12C08G18/32C08G18/34C08G18/3206C08G18/348C08G18/3234
Inventor 赵玻朱正君
Owner SHANGHAI MINGBANG RUBBER PROD
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