Process for preparing environment protection coating material by lacca modifying

A coating material and an environment-friendly technology, which is applied in the field of shellac modification to prepare an environment-friendly coating material, can solve problems such as environmental and human hazards, and achieve the effects of stable performance and good protection and anti-corrosion effect.

Inactive Publication Date: 2006-03-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the protective and anti-corrosion materials commonly used contain organic solvents, which cause great harm to the environment and human body during construction and use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: 2 grams of shellac is added with 15 milliliters of ethanol, and stirred until completely dissolved. Add 0.02 g of thiourea, heat up to 50° C. under stirring, and react for 1 hour. The viscosity of the solution increased slightly and the color deepened. The solution was cooled to room temperature to give a brownish red liquid with a viscosity of 8 seconds (coating - 4 cups). The liquid was directly applied to a flat wooden board by brushing, and left at room temperature for 24 hours to obtain a coating with a thickness of 2 microns. The hardness of the coating is H, and the adhesion is greater than grade 1.

Embodiment 2

[0019] Example 2: 10 grams of shellac was added with 15 milliliters of ethanol, and the temperature was raised to 75° C. under stirring until completely dissolved. Add 1 gram of ethylenediamine, heat up to 50° C. under stirring, and react for 4 hours. The viscosity of the solution increased slightly and the color deepened. The solution was cooled to room temperature to give a brownish red liquid with a viscosity of 15 seconds (coating - 4 cups). The liquid was directly applied to a flat wooden board by brushing, and left at room temperature for 24 hours to obtain a coating with a thickness of 10 microns. The hardness of the coating is H, and the adhesion is greater than grade 1.

Embodiment 3

[0020] Example 3: Add 15 ml of ethanol to 2 g of shellac, and stir at room temperature for 2 hours until completely dissolved. Add 0.02 g of thiourea, heat up to 50° C. under stirring, and react for 2 hours. The viscosity of the solution increased slightly and the color deepened. The solution was cooled to room temperature to give a brownish red liquid with a viscosity of 8 seconds (coating - 4 cups). The liquid was directly applied by brushing on a red copper plate that had been sanded, washed with acetone and dried, left at room temperature for 5 minutes, and dried at 50° C. for 1 hour to obtain a coating with a thickness of 2 microns. The hardness of the coating is H, the adhesion is greater than grade 1, and the salt spray test can reach 48 hours.

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Abstract

A process for preparing the environment protection type paint by lac modifying includes such steps as copolymerizing between natural lac and organic amine containing more than two aminos to obtain modified lac polymer, and mixing it with other polymer, slow-releasing agent and inorganic salt to obtain the paint with different components for wood, copper and its alloy, Al-Mg alloy, etc. Its advantages are high protecting and anticorrosion effect, high storage stability and no need of benzene solvent.

Description

technical field [0001] The invention belongs to the technical field of environment-friendly coating materials, and in particular provides a method for preparing environment-friendly coating materials by modifying shellac. Background technique [0002] The protection and corrosion protection of materials is an important topic in the materials industry. The surface protection of wood and other materials mainly requires the material to provide good mechanical properties and aesthetics, while the anti-corrosion protection of metal materials mainly requires the material to have good corrosion resistance and mechanical properties in various environments. At present, most of the protective and anti-corrosion materials commonly used contain organic solvents, which cause great harm to the environment and human body during construction and use. As people pay more and more attention to the environment and health, as well as the supervision on the use and discharge of pollutants, there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D193/02C09F1/04
Inventor 王金伟陈磊马天右李文波
Owner UNIV OF SCI & TECH BEIJING
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