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Preparation method of TPGDA (tripropylene glycol diacrylate)

A technology of tripropylene glycol diacrylate and tripropylene glycol, which is applied in the preparation of carboxylic acid esters, the preparation of organic compounds, the separation/purification of carboxylic acid esters, etc., and can solve the problem of loss of acrylic acid, non-environmental protection, and waste water treatment costs Advanced problems, to achieve the effect of reducing waste water discharge, improving product yield, and increasing yield

Inactive Publication Date: 2017-05-31
HUIZHOU CHANGRUNFA PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production, in order to increase the degree of esterification reaction, usually acrylic acid is excessive by 10-15%, and excess unreacted acrylic acid, catalyst and polymerization inhibitor must be removed. The only method in the prior art is to use the above-mentioned neutralization, extraction, and water washing The production of one ton of products produces about one ton of waste water, and a large amount of acrylic acid is lost. Not only the cost of waste water treatment is high, but the product yield is also low. It is an extremely environmentally unfriendly production process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0013] A preparation method of tripropylene glycol diacrylate, characterized in that the preparation steps are as follows:

[0014] (1) Take 44wt% of tripropylene glycol (TPG), 37.4wt% of acrylic acid, 2.2wt% of methanesulfonic acid catalyst, 560ppm of hydroquinone, 0.23wt% of hypophosphorous acid, and 16wt% of cyclohexane; put it into the reactor and mix Stir, ventilate, open the steam valve and heat slowly, control the vapor pressure at about 0.5Mpa, raise the temperature to 70-80°C in 1 hour, and keep it for 30 minutes, control the vapor pressure at 0.5Mpa, the reaction temperature is 80-91°C, and the reaction is 14- After 16 hours, the reaction is over, and the sample is sent for inspection. When the esterification acid value is about 20-50mgKOH / g, it indicates that the reaction is over;

[0015] (2) After the esterification reaction, the material is pumped into the adsorption tower with 40wt% macroporous adsorption resin, 40wt% ion exchange resin and 20wt% active molecula...

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PUM

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Abstract

The invention relates to a preparation method of TPGDA (tripropylene glycol diacrylate). Compared with the prior art, the preparation method has the advantages that unreacted products in reaction products are removed or reduced through exchange resin adsorption, different from neutralization, extraction and water wash processes, basically no washing wastewater is produced during production, discharge of wastewater during production is reduced, exchange resin can be recovered after adsorption saturation and reutilized after being activated, and the method is a novel process which is energy-saving, consumption-reducing and environment-friendly. Secondarily, water washing is not required, product waste because of water washing is avoided, and the product yield can be increased by 5% or above.

Description

technical field [0001] The invention relates to the field of chemical coatings, in particular to a preparation method of tripropylene glycol diacrylate. Background technique [0002] Tripropylene glycol diacrylate (TPGDA) is currently the most widely used difunctional acrylate monomer in the field of UV coatings. It is used in many fields, such as photocurable coatings, printing inks, adhesives and composite materials. The current method for producing this monomer is generally through direct esterification, after esterification, neutralization with lye, extraction, water washing and vacuum removal of solvent, to finally obtain the product. Specifically, it is composed of tripropylene glycol and acrylic acid, in catalysts (such as methanesulfonic acid, p-toluenesulfonic acid, inorganic heteropolyacids) and polymerization inhibitors (such as hydroquinone, p-hydroxyanisole, phenol, Under the action of one or several kinds of copper sulfate, cupric chloride, cuprous chloride, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/48C07C67/56C07C69/54
CPCC07C67/08C07C67/48C07C67/56
Inventor 练世斌戴超
Owner HUIZHOU CHANGRUNFA PAINT
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