Method for preparing water-based photocurable unsaturated polyester by melting first and then azeotropically

An unsaturated, light-curing technology, applied in the direction of polyester coatings, coatings, etc., can solve the problems affecting the long-term stability of the coating, affecting the hardness, gloss and scratch resistance of the paint film, and achieve easy recycling and reprocessing , fast curing speed, good stability

Inactive Publication Date: 2014-10-15
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxygen inhibition can eventually lead to a large number of oxidative structures such as hydroxyl groups, carbonyl groups, and peroxyl groups on the surface of the coating, thereby affecting the long-term stability of the coating, and may even affect the hardness, gloss, and scratch resistance of the cured paint film. performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 (One of the methods using first melting and then azeotropic method):

[0028] The method for azeotropically preparing water-based photocurable unsaturated polyester after first melting, it comprises the following steps:

[0029] 1) Under the protection of nitrogen, 20.00g trimethylolpropane diallyl ether, 16.00g neopentyl glycol, 15.00g dimethylol propionic acid, 8.00g suberic acid, 15.00g maleic anhydride, 17.00g of adipic acid and 0.26g of antioxidant were added to the four-port reactor with stirrer, condenser, thermometer and dripping device.

[0030] 2) Raise the temperature to 140°C, keep it warm for 1 hour, then raise the temperature to 150°C, and keep it warm for 1 hour (in this state, keep reflux without draining). Then take 1 hour to raise the temperature to 180°C, add 6g of xylene, keep it warm for 2 hours, and keep the reaction at this temperature; then keep the dehydration for 0.5 hours under the vacuum degree of 0.040MPa; you can appropriately i...

Embodiment 2

[0040] Melting first and then azeotropically preparing the method for water-based photocurable unsaturated polyester (melting first and then azeotropic method two), it comprises the following steps:

[0041] 1) Under the protection of nitrogen, 20.00g trimethylolpropane diallyl ether, 18.00g neopentyl glycol, 10.00g dimethylol propionic acid, 8.00g suberic acid, 10.00g maleic anhydride, 16.00g of adipic acid and 0.26g of antioxidant were added to the four-port reactor with stirrer, condenser, thermometer and dripping device.

[0042] 2) Raise the temperature to 140°C, keep it warm for 1 hour, then raise the temperature to 150°C, and keep it warm for 1 hour (in this state, keep reflux without draining). Then it took 1 hour to raise the temperature to 180°C, and added 6g of xylene and 7.00g of maleic anhydride, then kept it warm for 2 hours, and kept the reaction at this temperature, and kept it under a vacuum of 0.040MPa for 0.5 hours to dehydrate. The amount of nitrogen can b...

Embodiment 3

[0052] The method (one of the azeotropic method after first melting) of preparing water-based photocurable unsaturated polyester by azeotropy after first melting, it may further comprise the steps:

[0053] 1) Under the protection of nitrogen, 20.00g trimethylolpropane diallyl ether, 17.00g neopentyl glycol, 10.00g dimethylol propionic acid, 16.00g suberic acid, 10.00g maleic anhydride, 15.00g of adipic acid and 0.26g of antioxidant were added to the four-port reactor with stirrer, condenser, thermometer and dripping device.

[0054] 2) Raise the temperature to 140°C, keep it warm for 1 hour, then raise the temperature to 150°C, and keep it warm for 1 hour (in this state, keep reflux without draining). Then take 1 hour to raise the temperature to 180°C, and add 6g of xylene, then keep it warm for 2 hours (and keep the reaction at this temperature), and keep it dehydrated for 0.5 hours under a vacuum of 0.040MPa. You can appropriately increase the amount of nitrogen to facilita...

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PUM

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Abstract

The invention relates to a class of water-based unsaturated polyester with ultraviolet curing properties and a synthesis method thereof. It is characterized in that it includes the following steps: 1) under the protection of nitrogen, adding 40-60 parts by mass of polyol mixture, 40-60 parts by mass of polyacid mixture, and 0.1-0.3 parts by mass of antioxidant to the belt In a stirred four-port reactor; 2) heat up to 140°C, keep warm for 1h, then heat up to 150°C, keep warm for 1h; then heat up to 180°C for 1h, keep warm for 1h, and add 4-8 parts by mass of an inert solvent; 3) Cool down to 150°C, and add 0.2-0.5 parts by mass of polymerization inhibitor; dropwise add 7-15 parts by mass of glycidyl methacrylate into the reactor, and add 0.1-0.3 parts of tetramethylammonium iodide ; Cool down to 65°C, add a neutralizing agent to neutralize the product until the pH value of the product is 7-8, and obtain the product; stir the product and add water to dilute to obtain a water-based photocurable unsaturated polyester. The polyester prepared by the method has the characteristics of good stability.

Description

technical field [0001] The invention relates to a class of water-based unsaturated polyester with ultraviolet curing properties and a synthesis method thereof. Background technique [0002] Since the German Bayer company developed the first generation of UV-curable coatings (UVCC) in the 1960s, because this technology fully complies with the 3E principle, it has fast curing speed, no volatile solvents, energy saving, low cost, and automatic production. characteristics, has maintained a rapid development. Since oligomers, the main components used in photocurable coating systems, generally have high viscosity, more reactive diluents must be added to adjust viscosity and improve rheology before use, and most of these reactive diluents are toxic and irritating. On the other hand, with the gradual improvement of people's awareness of environmental protection and the stricter environmental protection regulations of various countries, water-based coatings have become one of the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/91C08G63/676C09D167/06
Inventor 闫福安严晶
Owner WUHAN INSTITUTE OF TECHNOLOGY
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