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Preparation method of DPGDA (dipropylene glycol diacrylate)

A technology of dipropylene glycol diacrylate and dipropylene glycol is applied in the field of preparation of dipropylene glycol diacrylate, which can solve the problems of loss of acrylic acid, unenvironmental protection, and high waste water treatment cost, and achieves reduction of waste water discharge, improvement of product yield, and increase of Yield effect

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 dipropylene glycol diacrylate, the preparation steps are as follows:

[0014] (1) Take 37wt% of dipropylene glycol, 43.8wt% of acrylic acid, 2wt% of methanesulfonic acid catalyst, 500ppm of hydroquinone, 0.23wt% of hypophosphorous acid, and 16wt% of cyclohexane; put them into the reactor for mixing and stirring, ventilate the air, open Slowly heat the steam valve, control the steam 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, react for 14-16 hours, and the reaction is over. Sampling and inspection, when the acid value of esterification is detected to be 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 molecular sieve, and the flow ra...

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PUM

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Abstract

The invention discloses a preparation method of DPGDA (dipropylene 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 dipropylene glycol diacrylate. Background technique [0002] Dipropylene glycol diacrylate (DPGDA) is a difunctional acrylate monomer second only to TPGDA in the UV coating field. 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 dipropylene glycol and acrylic acid, in catalysts (such as methanesulfonic acid, p-toluenesulfonic acid, inorganic heteropolyacids) and polymerization inhibitors (such as hydroquinone, p-hydroxyanisole, phenol, copper sulfate , cupric chloride, cuprous chloride, etc.) under the action of continuous esterification by usi...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C67/48C07C67/56C07C69/54
CPCC07C67/08C07C67/48C07C67/56C07C69/54
Inventor 练世斌戴超
Owner HUIZHOU CHANGRUNFA PAINT
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