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Ultraviolet curing polyurethane acrylate and preparation method thereof

A technology of urethane acrylate and hydroxy acrylate, which is applied in the field of ultraviolet light curing urethane acrylate and its preparation, can solve the problems of slow volatilization process, reduced resin and coating film performance, and high evaporation enthalpy, and achieves easy industrial production, good heat Good stability and wear resistance

Active Publication Date: 2018-12-14
深圳砺剑博纳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solid content of the currently reported water-based photocurable resin is only 30-50%. When the solid content is above 50%, the viscosity increases sharply, and the properties of the resin and the coating film decrease sharply.
Moreover, most of the research focuses on water dispersion or emulsion systems. Due to the large amount of water in the system and the high evaporation enthalpy of water, the volatilization process of such water-based coatings is very slow. Too much water makes it necessary to sacrifice energy for faster Drying and curing speed, which undoubtedly increases energy consumption and time, and lower hardness

Method used

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  • Ultraviolet curing polyurethane acrylate and preparation method thereof

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preparation example Construction

[0022] Such as figure 1 Shown, the preparation method of the ultraviolet curing urethane acrylate of one embodiment, comprises the steps:

[0023] Step S110 : under a protective gas environment, mix the diisocyanate and 1,4-cyclohexyldimethanol, and react at 60-85° C. for 1-3 hours to obtain a modified diisocyanate.

[0024] Wherein, the molar ratio of 1,4-cyclohexyldimethanol to diisocyanate is 1:2.

[0025] Wherein, the protective gas can be nitrogen or inert gas.

[0026] Wherein, the diisocyanate is selected from at least one of dicyclohexylmethane diisocyanate, diphenylmethane diisocyanate, terexylylene diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate and dicyclohexylmethane diisocyanate .

[0027] Step S120: adding dihydric alcohol to the modified diisocyanate, stirring and reacting at 60-80° C. for 2-4 hours to obtain a first reaction liquid.

[0028] Wherein, the diol is selected from at least one of polyether diol, polycaprolactone diol and polyca...

Embodiment 1

[0045] The preparation process of the UV-curable polyurethane acrylate of the present embodiment is as follows:

[0046] 1. Under the condition of nitrogen protection, add diisocyanate into the four-necked reaction flask with thermometer, condenser tube and stirring rod, put it in a constant temperature water bath at 60°C, and use a constant pressure funnel to dissolve 1,4 - Cyclohexyldimethanol was added dropwise into a four-necked reaction flask, and the reaction was kept for 3 hours to obtain a modified diisocyanate. Wherein, the molar ratio of 1,4-cyclohexyldimethanol to diisocyanate is 1:2. The diisocyanate is selected from dicyclohexylmethane diisocyanate.

[0047]2. Add dihydric alcohol to the modified diisocyanate, stir and react at 60° C. for 2 hours to obtain the first reaction solution. Wherein, dihydric alcohol is selected from polyether dihydric alcohol. The molar ratio of diol to modified diisocyanate is 1:2.

[0048] 3. Add polyhydroxy carboxylic acid and ca...

Embodiment 2

[0052] The preparation process of the UV-curable polyurethane acrylate of the present embodiment is as follows:

[0053] 1. Under the condition of nitrogen protection, add diisocyanate into the four-necked reaction flask with thermometer, condenser tube and stirring rod, put it in a constant temperature water bath at 85°C, and use a constant pressure funnel to dissolve 1,4 - Cyclohexyldimethanol was added dropwise into a four-necked reaction flask, and the reaction was incubated for 1 hour to obtain a modified diisocyanate. Wherein, the molar ratio of 1,4-cyclohexyldimethanol to diisocyanate is 1:2. The diisocyanate is selected from diphenylmethane diisocyanate.

[0054] 2. Add dihydric alcohol to the modified diisocyanate, stir and react at 80° C. for 4 hours to obtain the first reaction liquid. Wherein, dihydric alcohol is selected from polycaprolactone dihydric alcohol. The molar ratio of diol to modified diisocyanate is 1:6.

[0055] 3. Add polyhydroxy carboxylic acid ...

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Abstract

The invention relates to an ultraviolet photocuring polyurethane acrylate and a preparation method thereof. Ultraviolet photocuring polyurethane acrylate is prepared in the special steps that diisocyanate and 1,4-cyclohexanedimethanol are mixed and react at 70-85 DEG C to obtain modified diisocyanate; dihydric alcohol is added into the modified diisocyanate and stirred for reaction to obtain a first reaction solution; polyhydroxy carboxylic acid and a catalyst are added into the first reaction solution for stirring reaction, and a second reaction solution is obtained; hydroxyl acrylate and inhibitor are added into the second reaction solution at 50-60 DEG C for termination, the temperature is raised to 70-85 DEGC, acetone is added, reaction is carried out for 2 h, and a third reaction solution is obtained; triethylamine is added into the third reaction solution at 40-50 DG C, the temperature is lowered after reaction, and ultraviolet photocuring polyurethane acrylate is obtained. Ultraviolet photocuring polyurethane acrylate good in thermal-oxidative stability and large in hardness can be prepared through the preparation method.

Description

technical field [0001] The invention relates to the field of coatings, in particular to an ultraviolet-curable polyurethane acrylate and a preparation method thereof. Background technique [0002] In the application of traditional solvent-based UV-curable polyurethane acrylate, it is necessary to add acrylate reactive diluents to adjust the viscosity of oligomer resins, and these reactive diluents usually have certain skin irritation and volatility. After curing, unreacted small molecules volatilize into the air, which will cause serious harm to construction personnel, users and the environment. With the improvement of people's awareness of environmental protection and the restrictions on the content of volatile organic compounds (VOC) in various countries, it has become a consensus to develop low-pollution and environmentally friendly water-based UV-curable polyurethane acrylate products. [0003] The water-based ultraviolet (UV) curing system combines many advantages of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/67C08G18/66C08G18/48C08G18/42C08G18/44C08G18/34C08G18/12
CPCC08G18/12C08G18/348C08G18/4277C08G18/672C08G18/48C08G18/0823C08G18/44C08G18/6659C08G18/42C08G18/6692
Inventor 刘键姚志刚景梅张军华贾学明
Owner 深圳砺剑博纳科技有限公司