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Preparation method for neopentylglycol diacrylate

A technology of neopentyl glycol diacrylate and neopentyl glycol is applied in the preparation of carboxylate, the preparation of organic compounds, chemical instruments and methods, etc., and can solve the problems of loss of acrylic acid, unenvironmental protection, and high cost of waste water treatment, To achieve the effect of reducing waste water discharge, improving product yield and increasing yield

Inactive Publication Date: 2017-06-16
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

[0014] A preparation method of neopentyl glycol diacrylate, the preparation steps are as follows:

[0015] (1) Take neopentyl glycol (NPG) 32.1wt%, acrylic acid 48.8wt%, methanesulfonic acid catalyst 2wt%, hydroquinone 800ppm, hypophosphorous acid 0.23wt%, cyclohexane 16wt%; put it into the reactor and mix Stir, ventilate, open the steam valve and heat slowly, control the vapor pressure at about 0.5Mpa, heat up 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 react for 12 hours , the reaction is over, the sample is sent for inspection, and when the acid value of the esterification is detected to be about 20-50 mgKOH / g, it indicates that the reaction is over;

[0016] (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 rate is controlled so that the mat...

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PUM

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Abstract

Compared with the prior art, the method for preparing neopentyl glycol diacrylate of the present invention removes or reduces the unreacted substances in the reaction product through resin exchange adsorption, different neutralization, extraction, and water washing processes, and basically no washing wastewater is generated in the production process. It reduces the discharge of waste water in the production process, and the exchange resin can be recycled and reused after adsorption and saturation. It is a new energy-saving and environmentally friendly process. Secondly, there is no need to wash with water, and no product is wasted by washing with water, which improves the product yield, which can increase the yield by more than 5%.

Description

technical field [0001] The invention relates to the field of chemical coatings, in particular to a preparation method of neopentyl glycol diacrylate. Background technique [0002] Neopentyl glycol diacrylate (NPGDA) is a difunctional acrylate monomer used in a large amount in the field of UV coatings at present. 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 neopentyl 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, etc....

Claims

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Application Information

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