Polymerized ultraviolet absorbent, acrylic resin, and preparation method of modified epoxy coating

An ultraviolet absorber and acrylic resin technology, applied in the field of coatings, can solve problems such as failure and poor epoxy aging resistance, and achieve the effects of good light aging resistance and simple preparation process.

Pending Publication Date: 2020-09-11
QINGDAO AIR NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Epoxy has poor aging resistance, especially resistance to ultraviolet radiation. The traditional method of adding some ultraviolet absorbers to physical blending can improve it slightly, but this method will gradually fail as the surface is hydrolyzed.

Method used

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  • Polymerized ultraviolet absorbent, acrylic resin, and preparation method of modified epoxy coating

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preparation example Construction

[0023] On the one hand, the invention provides a kind of preparation method of polymeric ultraviolet absorber, comprises the following steps:

[0024] 4-hydroxybenzophenone, N-methylolacrylamide, organic solvent and anhydrous aluminum chloride are mixed and reacted in a constant temperature water bath, and then purified by column chromatography to obtain a polymeric ultraviolet absorber. The polymeric ultraviolet absorber Including 3-acrylamidomethyl-4-hydroxybenzophenone, the 3-acrylamidomethyl-4-hydroxybenzophenone has a carbon-carbon double bond functional group.

[0025] In some of the embodiments, the organic solvent is acetone and / or dichloromethane, and the reaction temperature in the constant temperature water bath is 35-40°C.

[0026] It can be understood that the present invention mixes 4-hydroxybenzophenone and N-hydroxyacrylamide, reacts with acetone or dichloromethane as a solvent, and uses aluminum trichloride as a catalyst to obtain the desired compound 3 throug...

Embodiment

[0042] Preparation of polymeric UV absorber:

[0043] Add 4-hydroxybenzophenone, N-methylolacrylamide and an appropriate amount of dichloromethane into a three-necked flask equipped with an electric stirring device, place it in a constant temperature water bath at 35°C to stir and react, condense and reflux, and wait for the raw materials to After dissolving, a 6% mass fraction of anhydrous aluminum chloride in dichloromethane solution was slowly added dropwise, and after reaction, purified by column chromatography to obtain a polymeric ultraviolet absorber.

[0044] Preparation of acrylic resin based on the polymeric UV absorber:

[0045](1) The mass ratio is (20%-50%): (15%-35%): (2%-10%): (5%-15%): (1%-5%): (1% -5%) of methyl methacrylate, BA, target compound, solvent, catalyst and chain transfer agent are mixed and added to a three-necked flask equipped with an electric stirring device, the oil bath is heated to 80°C-110°C, and the reaction is condensed while stirring Re...

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Abstract

The invention provides a polymerization type ultraviolet absorbent. A preparation method comprises the following steps: mixing 4-hydroxybenzophenone, N-hydroxymethyl acrylamide and an organic solventand carrying out a constant-temperature water bath reaction; and performing column chromatography purification to obtain the polymerized ultraviolet absorbent. The polymerized ultraviolet absorbent comprises 3-acrylamidemethyl-4-hydroxybenzophenone with a carbon-carbon double bond functional group. The preparation process is simple, and the ultraviolet absorbent can be used for graft polymerization; in addition, the invention further provides application of the polymerization type ultraviolet absorbent to synthesis of acrylic resin through a chemical grafting method, and relates to a modifiedepoxy coating which is obtained by compounding improved high-weather-resistance acrylic resin and epoxy resin according to a certain proportion and has corrosion resistance and aging resistance.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a preparation method of a polymeric ultraviolet absorber, an acrylic resin and a modified epoxy coating. Background technique [0002] Traditional supporting coatings generally include: anti-corrosion primer, intermediate coating and aging-resistant topcoat. With the advancement of science and technology and the improvement of social efficiency, traditional coating operations are increasingly insufficient, and the bottom-surface integrated coating can change the traditional three-coat system into one coat, which greatly reduces the spraying time and process. Avoid the risk of matching different coatings. As the most widely used primer, epoxy coating has an irreplaceable position in terms of anti-corrosion and mechanical properties. However, the disadvantages of traditional epoxy coatings are gradually exposed to people. One of the disadvantages that needs to be solved urgently ...

Claims

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Application Information

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IPC IPC(8): C07C231/12C07C233/31C08F220/14C08F220/18C08F220/58C09D163/00C09D133/12C09D133/08C09D5/32
CPCC07C231/12C08F220/14C08F220/18C09D163/00C09D5/32C08F220/1804C07C233/31C08F220/58C08F220/56C08L33/24
Inventor 郭焱郑同同周莲洁常海燕乔洪冰李永岗
Owner QINGDAO AIR NEW MATERIALS
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