Method for preparing pentaerythritol triacrylate
A pentaerythritol triacrylate and pentaerythritol technology are applied in the field of preparation of pentaerythritol triacrylate, can solve the problems of troublesome by-product treatment of waste water, serious environmental impact, poor activity and flexibility, etc., achieve low shrinkage and chromaticity, reduce Good effect of production cost, activity and flexibility
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preparation example Construction
[0026] The preparation method of this pentaerythritol triacrylate, the catalyst can be one of p-toluenesulfonic acid, methanesulfonic acid or silicotungstic acid; the selected solvent is one of toluene, benzene, n-hexane, cyclohexane Or several kinds, or a mixture of two or more kinds, and several kinds of solvents can be mixed and used in any proportion when preparing the solvent. The polymerization inhibitor selected here is one of hydroquinone, p-hydroxyanisole, phenothiazine, copper sulfate, or a mixture of two or more, and the addition amounts are:
[0027] Hydroquinone 100—250ppm;
[0028] p-Hydroxyanisole 100—500ppm;
[0029] Phenothiazine 50—300ppm;
[0030] Copper sulfate 300-800ppm.
[0031] While adding the polymerization inhibitor in the reactor, 50-500ppm of decolorizing agent activated carbon can be added.
Embodiment 1
[0033] A preparation method of pentaerythritol triacrylate, the steps of the preparation method are:
[0034] (1).Put 350g of pentaerythritol, 600g of acrylic acid, 10g of p-toluenesulfonic acid and 400g of toluene 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 activated carbon in the reaction system to form a mixed solution after fully mixing and stirring;
[0035] (2). Open the steam valve of the reactor to heat slowly, control the heating speed to keep the steam pressure at 0.3Mpa, control the temperature at 70°C within 1h and maintain this temperature for 30 minutes to react;
[0036] (3). Continue to heat the mixed solution, and reflux for 3 hours when the temperature rises to 80°C, and the reaction ends;
[0037] (4). Adding a concentration of 10% soda ash aqueous solution and a 20% sodium chloride aqueous solution to the mixed solution...
Embodiment 2
[0041] A preparation method of pentaerythritol triacrylate, wherein the steps of the preparation method are:
[0042] (1).Put 400g of pentaerythritol, 650g of acrylic acid, 100g of catalyst and 600g of solvent into the reaction kettle, and add 250ppm of hydroquinone as a polymerization inhibitor, and 500ppm of activated carbon as a decolorizing agent in the reaction system. liquid;
[0043] (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 90°C within 1h and maintain this temperature for 40 minutes to react;
[0044] (3). Continue to heat the mixed solution, and reflux for 5 hours when the temperature rises to 115°C, and the reaction ends;
[0045] (4). Adding a concentration of 10% soda ash aqueous solution and a concentration of 20% sodium chloride aqueous solution to the mixed solution, washing 4 times and standing for stratification, and taking the upper organic phase...
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