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Ultraviolet-curable waterborne polyurethane emulsion as well as preparation method and application thereof

A water-based polyurethane, ultraviolet light technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of low strength, low hardness, easy hydrolysis of ester bonds, poor product performance, etc., to achieve good hardness, wear resistance and scratch resistance. High damage and the effect of reducing the viscosity of the system

Inactive Publication Date: 2019-12-27
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ester bond of polyester-type water-based polyurethane is easy to hydrolyze and has poor water resistance; polyether-type water-based polyurethane itself has low strength and hardness, is not scratch-resistant, and has poor product performance

Method used

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  • Ultraviolet-curable waterborne polyurethane emulsion as well as preparation method and application thereof
  • Ultraviolet-curable waterborne polyurethane emulsion as well as preparation method and application thereof
  • Ultraviolet-curable waterborne polyurethane emulsion as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]The present embodiment carries out the preparation of UV-curable aqueous polyurethane emulsion, comprising the following steps:

[0042] 1) In terms of parts by mass, take 60 parts of polypropylene carbonate diols with a molecular weight of 2000 and a hydroxyl functionality of 2. After high-temperature vacuum dehydration, add 25 parts of isophorone diisocyanate, 4.5 parts of dimethylol Propionic acid and 0.12 parts of stannous octoate were subjected to the first reaction at 85° C. for 4 hours to obtain an intermediate.

[0043] 2) Lower the temperature to 70°C, add 1.9 parts of chain extender 1,4-butanediol to the intermediate, keep it warm for 0.5 hour for the second reaction, and obtain a polyurethane prepolymer.

[0044] 3) Cool down to 65°C, add 16 parts of reactive monomer hydroxyethyl methacrylate and 0.02 parts of 2,2,6,6-tetramethylpiperidine oxide (TEMPO) to the polyurethane prepolymer, and keep warm 2 hours for the third reaction, lower the temperature to 45°C...

Embodiment 2

[0046] The present embodiment carries out the preparation of UV-curable aqueous polyurethane emulsion, comprising the following steps:

[0047] 1) In terms of parts by mass, take 60 parts of polypropylene carbonate diols with a molecular weight of 2000 and a hydroxyl functionality of 2. After high-temperature vacuum dehydration, add 25 parts of isophorone diisocyanate, 4.5 parts of dimethylol Propionic acid and 0.12 parts of stannous octoate were subjected to the first reaction at 85° C. for 4 hours to obtain an intermediate.

[0048] 2) Lower the temperature to 70°C, add 1.9 parts of chain extender 1,4-butanediol to the intermediate, keep it warm for 0.5 hour for the second reaction, and obtain a polyurethane prepolymer.

[0049] 3) Cool down to 65°C, add 11 parts of reactive monomer dimethacrylate and 0.02 parts of polymerization inhibitor to the polyurethane prepolymer, keep warm for 2 hours for the third reaction, cool down to 45°C, add 3.5 parts Perform the third reactio...

Embodiment 3

[0051] The present embodiment carries out the preparation of UV-curable aqueous polyurethane emulsion, comprising the following steps:

[0052] 1) In terms of parts by mass, take 60 parts of polypropylene carbonate diols with a molecular weight of 2000 and a hydroxyl functionality of 2. After high-temperature vacuum dehydration, add 25 parts of isophorone diisocyanate, 4.5 parts of dimethylol Propionic acid and 0.12 parts of stannous octoate were subjected to the first reaction at 85° C. for 4 hours to obtain an intermediate.

[0053] 2) Lower the temperature to 70°C, add 1.9 parts of chain extender 1,4-butanediol to the intermediate, keep it warm for 0.5 hour for the second reaction, and obtain a polyurethane prepolymer.

[0054] 3) Cool down to 65°C, add 14 parts of reactive monomer pentaerythritol triacrylate and 0.02 parts of polymerization inhibitor to the polyurethane prepolymer, keep warm for 2 hours for the third reaction, cool down to 45°C, add 3.5 parts of neutralize...

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Abstract

The invention belongs to the technical field of new polymer materials, and particularly relates to an ultraviolet-curable waterborne polyurethane emulsion as well as a preparation method and application thereof. According to the invention, polypropylene carbonate dihydric alcohol, diisocyanate and a reactive monomer are used as main raw materials; a UV-curable double bond group then is introducedso that the acrylate resin and the polyurethane resin are connected through chemical bonds, therefore, organic unification of respective excellent properties of the two resins is effectively achieved,and a film cured by the ultraviolet-curable waterborne polyurethane emulsion is high in hardness and has good solvent resistance, corrosion resistance, scratch resistance and mechanical strength. Moreover, the raw materials of the ultraviolet-curable waterborne polyurethane emulsion do not need an organic solvent, acetone is not required to be used as a solvent to reduce the viscosity of the system during preparation, the reactive monomer can reduce the viscosity of the system, the use of the organic solvent is avoided, the problem of VOC emission is further solved, and the pollution to the environment and the harm to health are reduced.

Description

technical field [0001] The invention belongs to the technical field of new polymer materials, and in particular relates to an ultraviolet-curable water-based polyurethane emulsion and a preparation method and application thereof. Background technique [0002] Emphasis on environmental protection is a common trend in social development. Environmentally friendly new materials such as UV-curable polyurethane coatings are gradually replacing traditional solvent-based polyurethane materials into market applications and gradually replacing traditional products. Moreover, due to the high-efficiency and energy-saving features of UV-curable polyurethane coatings such as fast curing and no need for heating and baking, it is very suitable for assembly line operations. The development of its market is increasing year by year, and it is more and more used in the industrial production of commodities. , has brought a new revolution to the entire surface coating industry. [0003] The wate...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/67C08G18/66C08G18/44C08G18/34C08G18/32C09D175/14
CPCC08G18/3206C08G18/348C08G18/44C08G18/664C08G18/6659C08G18/672C08G18/673C08G18/755C09D175/14
Inventor 冼文琪刘保华王昱谢良军王勇攀
Owner GUANGDONG UNIV OF TECH
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