Shellac for increasing heat resistance of varnish, and modification method thereof

A heat-resistant, shellac technology, applied in the field of shellac, to achieve the effect of improving dry heat resistance and moist heat resistance

Active Publication Date: 2014-06-11
云南楚山源生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shellac modification method of this invention is essentially different from the present invent...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Example 1 . Under stirring, dissolve 20 grams of shellac and 6 grams of gum rosin in 100 grams of 95% alcohol, and heat at a temperature of 50-80°C until they are completely dissolved; add 2 grams of dry vegetable tung oil, 3 grams of pentaerythritol, 3 grams of glycerin, Heat up to 40-82°C while stirring, take 5 grams of modified accelerator morpholine and add to the solution and heat until it is completely dissolved. React for 1-4 hours to obtain a modified shellac solution. When cooling to 30-56°C, add 0.1 The finished product of modified shellac varnish obtained by ~5% oxalic acid; the liquid is 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 dry heat resistance temperature is 84°C, and the damp heat resistance temperature is 76°C. Compared with the unmodified shellac varnish film, the dry heat resistance temperature is 75 ℃, and the damp heat resistance temperatur...

example 2

[0026] Example 2 . Under stirring, dissolve 20 grams of shellac and 6 grams of hydrogenated rosin resin in 100 grams of diluent 95% alcohol, and heat at 50-80 ° C until they are completely dissolved. Add 3 grams of dry vegetable oil, linseed oil, 3 grams of pentaerythritol, and 3 grams of glycerin, and heat up to 40-82°C while stirring. Take 5 grams of modified accelerator urea and add it to the solution and heat until it is completely dissolved. React for 1-4 hours. Get the modified shellac solution, add 0.1~5% oxalic acid to obtain the finished modified shellac varnish when it is cooled to 30-56°C; apply the liquid directly on a flat wooden board by brushing, and leave it at room temperature for 24 hours , resulting in a coating with a thickness of 2 μm. The dry heat resistance temperature is 87°C, and the damp heat resistance temperature is 75°C. Compared with the unmodified shellac varnish film, the dry heat resistance temperature is 75 ℃, and the damp heat resistance t...

example 3

[0028] Example 3 . Under stirring, dissolve 20 grams of shellac and 6 grams of maleic acid modified rosin pentaerythritol fat in 100 grams of diluent 95% alcohol, and heat at 50-80°C until they are completely dissolved. Add 2 grams of dry vegetable tung oil and 3 grams of glycerin, heat up to 40-82°C while stirring, take 5 grams of modified accelerator urea, add it to the solution and heat until it is completely dissolved, and react for 1-4 hours to obtain modified shellac Solution, when cooled to 30-56°C, add 0.1-5% oxalic acid to obtain the finished modified shellac varnish; apply the liquid directly on a flat wooden board by brushing, and leave it at room temperature for 24 hours to obtain a thickness of 2 micron coating. The dry heat resistance temperature is 90°C, and the damp heat resistance temperature is 78°C. Compared with the unmodified shellac varnish film, the dry heat resistance temperature is 75 ℃, and the damp heat resistance temperature is 65 ℃.

[0029]

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Abstract

Embodiments of the invention disclose a shellac for increasing heat resistance of a varnish. The main components of the shellac comprise, by weight, 40-50% of shellac, 3-7% of dry vegetable oil, 5-9% of glycerol, 10-20% of a rosin resin, 5-10% of pentaerythritol, and 10-15% of a modification promoter. Embodiments of the present invention further disclose a shellac modification method for increasing heat resistance of a varnish. The modification method comprises: stirring shellac and a rosin resin, dissolving into a diluent, taking a modification promoter and adding to the obtained solution, and heating until completely dissolving, wherein the heating temperature is 50-80 DEG C; adding dry vegetable oil, pentaerythritol and glycerol to the obtained mixed solution, stirring while heating to a temperature of 40-82 DEG C, and carrying out a reaction for 1-4 h to obtain a modified shellac solution; and preparing the modified shellac solution into the shellac varnish finished product. According to the present invention, the dry heat resistance and the wet-heat resistance of the shellac paint film can further be substantially increased, and no harm on the environment and the human body during the construction and use process is generated.

Description

technical field [0001] The invention relates to shellac, in particular to a shellac for improving the heat resistance of varnish and a modification method thereof. Background technique [0002] The environmental protection of coatings is a major topic in the wood coating industry. The surface protection of wood mainly requires the material to provide good mechanical properties, aesthetics and weather resistance. Wood coatings are mainly used in furniture manufacturing and interior decoration. Among them, the furniture manufacturing industry plays an important role in the wood coating industry. In the furniture manufacturing industry, export furniture is the engine that drives the industry. Market demand is strong. At the same time, the domestic environment has been conducive to the development of environmentally friendly wood lacquer. On June 1, 2010, the national standard "Limits of Hazardous Substances in Solvent-Based Wood Coatings for Interior Decoration Materials" ...

Claims

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Application Information

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IPC IPC(8): C09D193/02C09D7/12C09F1/04C09F11/00
Inventor 和国荣
Owner 云南楚山源生物科技有限公司
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