A kind of synthetic method of hydroxyethyl methacrylate

A technology of hydroxyethyl methacrylate and methacrylic acid, which is applied in the field of synthesis of hydroxyethyl methacrylate, can solve problems such as patent documents that have not yet been found, and achieve convenient coating process, good weather resistance, and excellent coating performance. soft and hard effect

Inactive Publication Date: 2011-12-07
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] By searching, no patent documents related to the present invention have been found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of synthetic method of hydroxyethyl methacrylate, the steps are as follows:

[0018] (1) Place a 1000ml four-neck flask equipped with a stirrer, a thermometer, a reflux condenser and a gas inlet tube on a water bath, add 0.023mol iron oxide, an appropriate amount of p-hydroxyanisole and 1mol methacrylic acid, and heat the water bath to At 82°C, replace the air in the reaction bottle with nitrogen. After the ferric oxide is completely dissolved in methacrylic acid, 1.1 mol of ethylene oxide gas is introduced for 4.2 hours, and the reaction is continued for 1 hour after the aeration is completed.

[0019] (2) Then the reactant is transferred to a Kjeldahl retort, and then an appropriate amount of p-hydroxyanisole is added to carry out vacuum distillation, and the fraction collected at 82-85°C / 5mmHg is the finished product of hydroxyethyl methacrylate.

Embodiment 2

[0021] A kind of synthetic method of hydroxyethyl methacrylate, the steps are as follows:

[0022] (1) Place a 1000ml four-neck flask equipped with a stirrer, a thermometer, a reflux condenser and a gas inlet tube on a water bath, add 0.025mol iron oxide, an appropriate amount of p-hydroxyanisole and 1mol methacrylic acid, and heat the water bath to At 85°C, replace the air in the reaction bottle with nitrogen. After the ferric oxide is completely dissolved in methacrylic acid, 1.2 mol of ethylene oxide gas is introduced for 4 hours, and the reaction is continued for 1 hour after the ventilation is completed.

[0023] (2) Then transfer the reactant into a Kjeldahl distillation flask, add an appropriate amount of p-hydroxyanisole and carry out vacuum distillation, and collect the fraction at 80-85°C / 4-5mmHg, which is the finished product of hydroxyethyl methacrylate .

Embodiment 3

[0025] A kind of synthetic method of hydroxyethyl methacrylate, the steps are as follows:

[0026] (1) Place a 1000ml four-neck flask equipped with a stirrer, a thermometer, a reflux condenser and a gas inlet tube on a water bath, add 0.024mol iron oxide, an appropriate amount of p-hydroxyanisole and 1mol methacrylic acid, and heat the water bath to At 82-84°C, replace the air in the reaction bottle with nitrogen. After the ferric oxide is completely dissolved in methacrylic acid, 1.15 mol of ethylene oxide gas is introduced for 4.2 hours, and the reaction is continued for 1 hour after the aeration is completed.

[0027] (2) Then transfer the reactants into a Kjeldahl distillation flask, add an appropriate amount of p-hydroxyanisole and carry out vacuum distillation, and collect the fraction at 82-86°C / 5-6mmHg, which is the finished product of hydroxyethyl methacrylate .

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PUM

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Abstract

The present invention relates to a kind of synthetic method of hydroxyethyl methacrylate, and the steps of synthetic method are: (1) place 1000ml four-neck flask on water bath, add ferric oxide, p-hydroxyanisole and methacrylic acid, water bath Heat to 80-85°C, replace the air in the reaction bottle with nitrogen, and then pass in ethylene oxide gas after the ferric oxide is completely dissolved in methacrylic acid. The aeration time is 3.5-4.5 hours. 1.5h; (2) Transfer the reactant to a Kjeldahl distillation flask, then add an appropriate amount of p-hydroxyanisole for vacuum distillation, and collect the fraction at 80-86°C/4-6mmHg to be the finished product. The present invention selects the novel high-efficiency polymerization inhibitor p-hydroxyanisole, which is superior to other polymerization inhibitors (such as hydroquinone). The effect is remarkable and the dosage is small, which can fully meet the requirements of use and guarantee the product quality.

Description

technical field [0001] The invention belongs to the field of fine chemicals, in particular to a method for synthesizing hydroxyethyl methacrylate. Background technique [0002] As a difunctional monomer, hydroxyethyl methacrylate has an important application in the synthesis of acrylic resin coatings with excellent performance. It can be copolymerized with other vinyl monomers to produce acrylic resin with -OH side chain, and it can be used as thermosetting acrylic paint when combined with melamine formaldehyde resin, which is an important type of acrylic series paint. This -OH-bearing resin can also be used as the hydroxyl component of polyurethane coatings. [0003] By searching, no patent documents related to the present invention have been found yet. Contents of the invention [0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a light color, gloss retention, color retention, good weather resistance, stable to aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/54C07C67/26
Inventor 周琦
Owner TIANJIN CHEM REAGENT RES INST
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