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Method for preparing ultraviolet photocuring polyurethane resin based on polybasic isocyanate and polybasic hydroxy polyacrylate

The technology of hydroxy polyacrylate and polyisocyanate is applied in the field of preparation of UV-curable polyurethane resin, which can solve the problems of non-corrosion resistance and low mechanical strength, and achieve the effects of enhanced corrosion resistance, low raw material cost and simple synthesis process.

Inactive Publication Date: 2011-05-11
NANCHANG HANGKONG UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of the ultraviolet curing polyurethane resin based on multivalent isocyanate and polyhydroxy polyacrylate, overcome the shortcomings such as low mechanical strength of the ultraviolet curing polyurethane resin of prior art, not corrosion resistance etc.

Method used

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  • Method for preparing ultraviolet photocuring polyurethane resin based on polybasic isocyanate and polybasic hydroxy polyacrylate
  • Method for preparing ultraviolet photocuring polyurethane resin based on polybasic isocyanate and polybasic hydroxy polyacrylate
  • Method for preparing ultraviolet photocuring polyurethane resin based on polybasic isocyanate and polybasic hydroxy polyacrylate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This example illustrates the acetone-di-n-butylamine method used when testing the isocyanate group content in the reaction.

[0019] The specific test method is as follows:

[0020] 1) Prepare 0.1mol / L HCl standard solution.

[0021] 2) Prepare 0.1mol / L di-n-butylamine-acetone standard solution.

[0022] 3) Titrate 10 ml of di-n-butylamine standard solution with HCl standard solution, use HCl standard solution volume V 1 ml.

[0023] 4) Add W to a 150ml Erlenmeyer flask 1 The sample of the g reactant (the weighing amount can be larger when the conversion rate is higher), add acetone to dissolve, and finally add a small amount of indicator bromophenol blue.

[0024] 5) Add 10 ml of di-n-butylamine standard solution, stir evenly, and keep warm at about 25°C for 15 minutes.

[0025] 6) Titrate with HCl standard solution, the color changes from blue to yellow, use HCl standard solution volume V 2 ml.

[0026] Calculation of the mass molar concentration of isocyanat...

Embodiment 2

[0032] This example illustrates the preparation method of the UV-curable polyurethane resin provided by the present invention.

[0033] 1) Add 30 parts by weight of hydroxyethyl acrylate, 15 parts by weight of butanol and 0.1 part by weight of catalyst dibutyltin dilaurate into the constant pressure dropping funnel, and slowly drop them into a container with 30 parts by weight under certain temperature conditions. Parts of polyisocyanate, 1 hour dropwise,

[0034] 2) After the dropwise addition in step 1), adjust the temperature of the oil bath to 45°C, and after 2 hours of reaction, use the acetone-di-n-butylamine method to measure the isocyanate content every 1 hour, and stop when the reaction reaches the predetermined value reaction.

[0035] 3) Add 20 parts by weight of polyhydroxy acrylate resin and 1 part by weight of inhibitor 4-methoxyphenol to the reacted product in step 2), and react at 50°C for 8-12 hours. Use the acetone-di-n-butylamine method to measure the cont...

Embodiment 3

[0038] This example illustrates the preparation method of the UV-curable polyurethane resin provided by the present invention.

[0039] 1) Add 40 parts by weight of hydroxyethyl acrylate, 10 parts by weight of butanol and 0.5 parts by weight of catalyst dibutyltin dilaurate into the constant pressure dropping funnel, and slowly drop it into a container with 40 parts by weight under certain temperature conditions. Parts of polyisocyanate, 1 hour dropwise,

[0040] 2) After the dropwise addition in step 1), adjust the temperature of the oil bath to 45°C, and after 2 hours of reaction, use the acetone-di-n-butylamine method to measure the isocyanate content every 1 hour, and stop when the reaction reaches the predetermined value reaction.

[0041] 3) Add 30 parts by weight of polyhydroxy acrylate resin and 1 part by weight of polymerization inhibitor 4-methoxyphenol to the reacted product in step 2), and react at 50°C for 8-12 hours. Use the acetone-di-n-butylamine method to me...

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Abstract

The invention relates to a method for preparing ultraviolet photocuring polyurethane resin based on polybasic isocyanate and polybasic hydroxy polyacrylate. The method comprises the following steps of: 1) adding monohydroxy acrylic ester, butanol and dibutyltin dilaurate into a constant-pressure dropping funnel; 2) regulating the temperature of an oil bath pot to be between 20 and 50 DEG C after dropping is finished in the step 1), reacting for 1 to 2 hours and stopping the reaction; 3) adding 20 to 30 weight parts of polyhydroxy acrylic resin and 0.5 to 1.5 weight parts of inhibitor 4-methoxy phenol into a reaction product obtained in the step 2); and 4) adding 5 to 15 weight parts of active monomer thinner according to the solid content to obtain a product. The method has the advantages of performing polyfunctional monomer premature crosslinking, introducing more double bonds, and improving the crosslinking and relative molecular weight of a paint film; and the product has high mechanical properties and greatly improved corrosion resistance.

Description

technical field [0001] The invention relates to a preparation method of an ultraviolet light-curable polyurethane resin, in particular to a preparation method of an ultraviolet light-curable polyurethane resin based on polyvalent isocyanate and polyhydric hydroxyl polyacrylate. Background technique [0002] With the rapid development of industry, more and more attention has been paid to environmental protection and energy conservation, and fundamental changes have taken place in the development direction and product structure of the paint industry. Especially marked by the "4E" principles (Economy, Efficiency, Environment and Energy) proposed by the US Environmental Protection Agency in 1977, coatings are developing towards resource-saving, energy-saving, and pollution-free. The "saving" coatings represented by series of coatings, powder coatings, and high-solid content coatings. Among them, UV-curable coatings, as a new type of coatings, have become a hot topic in research...

Claims

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Application Information

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IPC IPC(8): C08G18/72C08G18/67C08G18/65C08G18/62C09D175/16
Inventor 杜楠梁红波王力强熊磊谢春英
Owner NANCHANG HANGKONG UNIVERSITY
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