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Preparation method of neopentyl glycol dimethacrylate

A technology of neopentyl glycol dimethacrylate and methacrylic acid, 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 large amounts of by-products and waste water and serious environmental impacts , low yield and low chroma, and achieve the effects of high yield, simple operation and low chroma

Inactive Publication Date: 2018-09-28
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the preparation method related to neopentyl glycol diacrylate in the above documents and patents can obtain corresponding products, there are still complex processes, low yield and chroma, high production cost, high acidity and viscosity, and side effects generated. Problems such as large amount of products and waste water and serious impact on the environment

Method used

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  • Preparation method of neopentyl glycol dimethacrylate
  • Preparation method of neopentyl glycol dimethacrylate

Examples

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Embodiment 1

[0018] This embodiment provides a kind of preparation method of neopentyl glycol dimethacrylate. Take by weighing 92.54g methacrylic acid, 52.07g neopentyl glycol (the mol ratio of methacrylic acid and neopentyl glycol is 2.15: 1.0), 5.78g p-toluenesulfonic acid catalyst (4% of reactant gross weight) respectively, 0.144g phenothiazine polymerization inhibitor (0.1% of reactant gross weight) and 65.07g hexanaphthene (45% of reactant gross weight) join in the 500mL there-necked flask, adorn thermometer, reflux condenser and oil-water separator , turn on magnetic stirring and heating, control the reaction temperature at 84-86° C., and react for 5 hours to obtain neopentyl glycol dimethacrylate. Cool to room temperature, filter, decolorize with activated carbon, add saturated sodium bicarbonate solvent to the mixed solution to wash, then wash with distilled water for 1-2 times, let stand to separate layers, take the upper organic phase, and distill off the organic solvent under re...

Embodiment 2

[0020] This embodiment provides a kind of preparation method of neopentyl glycol dimethacrylate. Take by weighing 88.24g methacrylic acid, 52.07g neopentyl glycol (the mol ratio of methacrylic acid and neopentyl glycol is 2.05: 1.0), 4.21g p-toluenesulfonic acid catalyst (3% of reactant gross weight) respectively, 0.070g phenothiazine polymerization inhibitor (0.05% of reactant gross weight) and 70.16g hexanaphthene (50% of reactant gross weight) join in the 500mL there-necked flask, adorn thermometer, reflux condenser and oil-water separator , start magnetic stirring and heating, control the reaction temperature at 84-86° C., and react for 4 hours to obtain neopentyl glycol dimethacrylate. Cool to room temperature, filter, decolorize with activated carbon, add saturated sodium bicarbonate solvent to the mixed solution to wash, then wash with distilled water for 1-2 times, let stand to separate layers, take the upper organic phase, and distill off the organic solvent under red...

Embodiment 3

[0022] This embodiment provides a kind of preparation method of neopentyl glycol dimethacrylate. Take by weighing 94.64g methacrylic acid, 52.07g neopentyl glycol (the mol ratio of methacrylic acid and neopentyl glycol is 2.20: 1.0), 5.86g p-toluenesulfonic acid catalyst (3% of reactant gross weight) respectively, 0.073g phenothiazine polymerization inhibitor (0.05% of reactant gross weight) and 58.68g hexanaphthene (50% of reactant gross weight) join in the 500mL there-necked flask, adorn thermometer, reflux condenser and oil-water separator , turn on magnetic stirring and heating, control the reaction temperature at 78-80° C., and react for 7 hours to obtain neopentyl glycol dimethacrylate. Cool to room temperature, filter, decolorize with activated carbon, add saturated sodium bicarbonate solvent to the mixed solution to wash, then wash with distilled water for 1-2 times, let stand to separate layers, take the upper organic phase, and distill off the organic solvent under r...

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Abstract

The invention provides a preparation method of neopentyl glycol dimethacrylate. The preparation method comprises the steps that under the effect of a catalyst on methylbenzenesulfonic acid, in presence of a polymerization inhibitor and an azeotropic water-carrying agent, neopentyl glycol and methacrylic acid react with each other for 4-7 hours at 78-92 DEG C to synthesize neopentyl glycol dimethacrylate, wherein the mole ratio of methacrylic acid to neopentyl glycol is 2.15:1, the dosage of the azeotropic water-carrying agent n-hexane is 45% of the total mass of the reactants, the mass of thecatalyst is 4% of the total mass of the reactants, and the dosage of the polymerization inhibitor phenothiazine is 0.1% of the total mass of the reactants. The synthesis method of neopentyl glycol dimethacrylate is simple in process, high in yield and low in chromaticity, the adopted catalyst is low in price and high in stability, and the method has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of chemical coatings, and relates to a preparation method of neopentyl glycol dimethacrylate. Background technique [0002] Acrylates are an important class of organic chemical products, which are widely used in various fields such as coatings, plastics, adhesives, medicine, and textiles. Neopentyl glycol dimethacrylate is also an important acrylic functional monomer. Because of its high double bond content, it can be used as an auxiliary crosslinking agent for peroxidative crosslinking, and is suitable for the vulcanization system of synthetic rubber that is difficult to vulcanize with sulfur; It has the characteristics of shortening the crosslinking time and improving vulcanized rubber. It can also be used as a modifier. It is suitable for wire and cable coatings, photosensitive resins, adhesives, paints, foam plastics, etc. The preparation methods of neopentyl glycol dimethacrylate in the prior art mainl...

Claims

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Application Information

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IPC IPC(8): C07C67/08C07C69/54
CPCC07C67/08C07C69/54
Inventor 孟婷徐海军贾凯付博蔡正春
Owner NANJING FORESTRY UNIV
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