Method for preparing hydroxypropyl methacrylate

A technology of hydroxypropyl methacrylate and methacrylic acid, which is applied in the field of preparation of hydroxypropyl methacrylate, can solve the problems such as the innovative technical literature of hydroxypropyl methacrylate has not been found, and achieves convenient coating process and coating. The film properties are soft and hard, and have good weather resistance.

Inactive Publication Date: 2010-12-15
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through the search, no innovative technical literature of hydroxypropyl methacrylate has been found

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] A kind of preparation method of hydroxypropyl methacrylate, raw material ratio is:

[0017] Methacrylic acid 1mol

[0018] Propylene oxide 1.1mol

[0019] Iron oxide 0.023mol

[0020] Proper amount of hydroquinone.

[0021] The preparation method is:

[0022] Put a 1000ml four-necked flask equipped with a stirrer, a thermometer, a reflux condenser and a constant pressure dropping funnel on a water bath, add 0.023mol of ferric oxide, an appropriate amount of hydroquinone and 1mol of methacrylic acid, and heat the water bath to 82°C 1.1mol propylene oxide was added dropwise through the constant pressure dropping funnel under stirring, and the dropwise addition was completed in 1.4 hours, and then the reaction was continued at 80--85°C for 1 hour. Then transfer the reactant to a Kjeldahl distillation flask, add a proper amount of hydroquinone and carry out vacuum distillation, and collect the fraction at 76--77°C / 5mmHg, which is the finished product of hydroxypropyl me...

Embodiment 2

[0024] A kind of preparation method of hydroxypropyl methacrylate, raw material ratio is:

[0025] Methacrylic acid 1mol

[0026] Propylene oxide 1.2mol

[0027] Iron trioxide 0.025mol

[0028] Proper amount of hydroquinone.

[0029] The preparation method is:

[0030] Put a 1000ml four-neck flask equipped with a stirrer, a thermometer, a reflux condenser and a constant pressure dropping funnel on a water bath, add 0.025mol of iron oxide, an appropriate amount of hydroquinone and 1mol of methacrylic acid, and heat the water bath to 85°C 1.2mol propylene oxide was added dropwise through a constant pressure dropping funnel under stirring, and the dropwise addition was completed in 1.5 hours, and then the reaction was continued at 83--85°C for 1 hour. Then transfer the reactant into a Kjeldahl distillation flask, add an appropriate amount of hydroquinone, and carry out vacuum distillation to collect the fraction at 74-77°C / 4--5mmHg, which is the finished product of hydroxypro...

Embodiment 3

[0032] A kind of preparation method of hydroxypropyl methacrylate, raw material ratio is:

[0033] Methacrylic acid 1mol

[0034] Propylene oxide 1.15mol

[0035] Iron oxide 0.024mol

[0036] Proper amount of hydroquinone.

[0037] The preparation method is:

[0038] Put a 1000ml four-neck flask equipped with a stirrer, a thermometer, a reflux condenser and a constant pressure dropping funnel on a water bath, add 0.024mol of ferric oxide, an appropriate amount of hydroquinone and 1mol of methacrylic acid, and heat the water bath to 82- -84°C, add 1.15mol propylene oxide dropwise through the constant pressure dropping funnel under stirring, complete the dropwise addition in 1.5 hours, then continue the reaction at 82--84°C for 1 hour. Then transfer the reactants into a Kjeldahl distillation flask, add an appropriate amount of hydroquinone and carry out vacuum distillation, and collect the fraction at 76--78°C / 5--6mmHg, which is the finished product of hydroxypropyl methacry...

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PUM

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Abstract

The invention relates to a method for preparing hydroxypropyl methacrylate. The method comprises the following steps of: putting 1,000 ml four-mouth flask on water bath, wherein a stirrer, a thermometer, a reflux condenser and a constant-pressure drop funnel are arranged in the 1,000 ml four-mouth flask; adding ferric oxide, hydroquinone and methacrylic acid into the four-mouth flask; heating the mixture to the temperature of between 80 and 85 DEG C in the water bath, stirring for 1.5 hours and dripping propylene oxide into the mixture by using the constant-pressure drop funnel; after the dripping is finished, continuing the reaction for 1 hour at the temperature of between 80 and 85 DEG C; and transferring the reactant into a Kolle distillation flask, adding a proper amount of hydroquinone again, performing reduced pressure distillation and collecting fraction, namely the finished product, at the temperature of between 73 and 77 DEG C under the pressure of 4 to 5 mmHg. The hydroxyethyl methacrylate prepared by the method contains a double bond and a hydroxyl group and is a bifunctional monomer and can be widely used as a crosslinking monomer in paint and an adhesive; and the acrylic resin paint serving as a film forming material has the characteristics of light color, gloss retention, color retention, high weather resistance, stability to acid, water and alcohol, convenient coating process, soft and hard coating performance, durability and the like.

Description

technical field [0001] The invention belongs to the field of fine chemicals and relates to a preparation method of hydroxypropyl methacrylate. Background technique [0002] Hydroxypropyl methacrylate has a wide range of applications, for the preparation of thermosetting acrylic coating styrene-butadiene rubber emulsion modifier, acrylic modified polyurethane coating, water-soluble electroplating coating binder, fiber finishing agent, paper coating, photosensitive coating And various resins for polyurethane resin modifiers and other substances. [0003] As a difunctional monomer, hydroxypropyl 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 resins with -OH side chains, and can be used as thermosetting acrylic coatings when combined with melamine formaldehyde resins. It is an important class of acrylic series coatings. -OH resins can also be u...

Claims

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Application Information

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