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Method for preparing neopentylglycol diacrylate

A technology of neopentyl glycol diacrylate and neopentyl glycol, which is applied to the preparation of carboxylic acid esters, the preparation of organic compounds, chemical instruments and methods, etc., and can solve the problem of excessive by-products and waste water, shrinkage and irritation Large size, poor activity and flexibility, etc., to achieve the effect of low cost, good activity and flexibility, good activity and flexibility

Inactive Publication Date: 2009-06-24
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production method of neopentyl glycol diacrylate is mainly alkyd direct esterification method at present, though corresponding product can be obtained, still there is following defect: 1. product technology is complicated, and yield and chromaticity are lower, acidity and High viscosity; 2. Poor activity and flexibility; 3. Large shrinkage and irritation, which is easy to irritate human skin; 4. A large amount of by-products and waste water are generated, which has a serious impact on the environment; 5. High production cost and poor quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of preparation method of neopentyl glycol diacrylate, the step of its preparation method is:

[0033] (1). Put 380g of neopentyl glycol, 580g of acrylic acid, 10g of catalyst and 400g of solvent into the reaction kettle, and add polymerization inhibitor hydroquinone 100ppm, p-hydroxyanisole 100ppm, phenothiazine 50ppm, copper sulfate 300ppm, and at the same time add 50ppm of decolorizing agent activated carbon in the reaction system to form a mixed solution after fully mixing and stirring;

[0034] (2). Open the steam valve of the reaction kettle to heat slowly, control the heating speed to keep the steam pressure at 0.3Mpa, control the temperature at 50°C within 1h and maintain this temperature for 20 minutes to react;

[0035] (3). Continue to heat the mixed solution, and reflux for 3 hours when the temperature rises to 70°C, and the reaction ends;

[0036] (4). Adding a concentration of 10% soda ash aqueous solution and a concentration of 20% sodium chloride ...

Embodiment 2

[0040] A kind of preparation method of neopentyl glycol diacrylate, the step of its preparation method is:

[0041] (1). Put 420g of neopentyl glycol, 620g of acrylic acid, 100g of catalyst and 600g of solvent into the reaction kettle, add 250ppm of hydroquinone as a polymerization inhibitor, and add 500ppm of activated carbon as a decolorizing agent in the reaction system and mix thoroughly Stir to form a mixture;

[0042] (2). Open the steam valve of the reaction kettle to heat slowly, control the heating speed to keep the steam pressure at 0.5Mpa, control the temperature at 70°C within 1h and maintain this temperature for 40 minutes to react;

[0043] (3). Continue to heat the mixed solution, and reflux for 5 hours when the temperature rises to 116°C, and the reaction ends;

[0044] (4). Adding a concentration of 10% soda ash aqueous solution and a concentration of 20% sodium chloride aqueous solution to the mixed solution, washing for 3 times and standing for stratificati...

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PUM

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Abstract

The invention belongs to a method for preparing neopentyl glycol diacrylate ester, comprising the steps as follows: (1) neopentyl glycol, acrylic acid, catalyst, solvent and polymerization inhibitor are put into a reaction kettle to be fully mixed and stirred, so as to form a mixture; (2) a steam valve of the reaction kettle is opened to slowly heat the mixture, within 1h the temperature is controlled and maintained at 50-80 DEG C for a 20-40min reaction; (3) when the temperature is increased to 70-120 DEG C, reflow is carried out for 3-5h and then the reaction is finished; (4) soda water solution and sodium chloride water solution are added into the mixture and after washing the upper organic phase is extracted; (5) the upper organic phase is separated from the solvent; (6) then cooling and filter pressing are carried out to obtain the end product. The method has simple process, high yield coefficient, low color intensity, good activity and flexibility, low shrinking percentage and good quality and produces few by-products or little waste water.

Description

technical field [0001] The invention belongs to the field of fine chemicals, in particular to a preparation method of neopentyl glycol diacrylate. Background technique [0002] Neopentyl glycol diacrylate (NPGDA) is an important acrylic functional monomer with the formula C 11 h 16 o 4 , with a molecular weight of 212, easily soluble in organic solvents such as low-carbon alcohols and aromatic hydrocarbons, but insoluble in water. The appearance is colorless or light yellow transparent oily liquid, which is widely used in many fields, such as: photo-coating printing, adhesives, composite materials, photo-curing coatings, inks, flexographic printing, photoresist, solder resist, corrosion resistance Preparation of agents and molds. The production method of neopentyl glycol diacrylate is mainly alkyd direct esterification method at present, though corresponding product can be obtained, still there is following defect: 1. product technology is complicated, and yield and chro...

Claims

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Application Information

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IPC IPC(8): C07C69/54C07C67/08
Inventor 牟国光
Owner TIANJIN CHEM REAGENT RES INST
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