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A kind of preparation method of tannic acid modified raw lacquer composite coating

A composite coating and tannic acid technology, which is applied in the field of chemical modification treatment of coatings to achieve the effects of high safety, simple process operation and good film-forming performance

Active Publication Date: 2015-12-23
NANJING ZHONGSEN BIOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the modification of raw lacquer with tannic acid

Method used

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  • A kind of preparation method of tannic acid modified raw lacquer composite coating
  • A kind of preparation method of tannic acid modified raw lacquer composite coating
  • A kind of preparation method of tannic acid modified raw lacquer composite coating

Examples

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Effect test

Embodiment 1

[0026] Preparation method of tannic acid modified raw lacquer composite coating

[0027] Take the raw lacquer liquid, extract it with 5-10 times the volume of organic solvent for 3-4 times, combine the organic solvent phase, recover the organic solvent to obtain refined raw lacquer; weigh a certain amount of refined raw lacquer, first add 20 After reacting with % metal ethanol solution for 30-40 minutes, add tannic acid with 6-12% of refined raw lacquer quality, react at 50-80°C for 3-5 hours, recover ethanol, and obtain tannic acid-modified raw lacquer composite coating . The raw lacquer solution is the original lacquer sap collected from lacquer trees, which is derived from Chinese lacquer trees or Vietnamese lacquer trees, and the urushiol content is 40-80%; the tannic acid is derived from Galla galla or persimmon; the organic solvent is One of absolute ethanol, acetone or petroleum ether; the metal ion species in the 20% metal ethanol solution is FeCl 3 , SbCl 3 or SnCl...

Embodiment 2

[0042] Preparation of Tannic Acid Modified Raw Lacquer Composite Coatings

[0043] Take 1 kg of raw lacquer solution, extract it with 5 times the volume of absolute ethanol for 3 times, combine the absolute ethanol phase, and recover the ethanol to obtain 600 g of refined raw lacquer; weigh 200 g of refined raw lacquer, first add 40 ml of 20% FeCl 3 After the ethanol solution was reacted for 30 minutes, 16 g of tannic acid was added and reacted for 3 hours at a temperature of 60° C. After recovering ethanol, a tannic acid modified raw lacquer composite coating was obtained. The various indicators of its film-forming performance are as follows: the drying time is 52 hours, the adhesion level is 3-4, the impact resistance level is 30kg / cm, and the hardness is 2H level.

Embodiment 3

[0045] Preparation of Tannic Acid Modified Raw Lacquer Composite Coatings

[0046] Take 1 kg of raw lacquer solution, extract it with 6 times the volume of acetone for 4 times, combine the acetone phases, and recover the acetone to obtain 580 g of refined raw lacquer; weigh 200 g of refined raw lacquer, first add 40 ml of 20% SbCl 3 After the ethanol solution was reacted for 40 minutes, 20 g of tannic acid was added and reacted for 4 hours at a temperature of 70° C. After recovering ethanol, a tannic acid modified raw lacquer composite coating was obtained. The various indicators of its film-forming performance are as follows: the drying time is 53 hours, the adhesion level is 3-4, the impact resistance level is 30kg / cm, and the hardness is 2H level.

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Abstract

The invention relates to a preparation method of tannic acid modified raw lacquer composite coating. The preparation method comprises the following steps: extracting a raw lacquer liquid through 5-10 times by volume of organic solvents for 3-4 times, mixing the organic solvent phases, and recycling the organic solvents to obtain refined raw lacquer; taking a certain amount of refined raw lacquer, firstly adding a 20% metal ethanol solution accounting for 0.2 times of the mass of the refined raw lacquer to react for 30-40 min, and then, adding tannic acid accounting for 6-12% of the mass of the refined raw lacquer, reacting for 3-5 h under a temperature condition of 50-80 DEG C, and recycling ethanol to obtain the tannic acid modified raw lacquer composite coating. The tannic acid modified raw lacquer composite coating prepared by the technology has quite good film-forming property, and the performance indexes exceed the national standards; and the method is environment-friendly, simple in process operation and low in production cost, thereby capable of becoming a novel technology for producing modified raw lacquer composite coating on industry.

Description

technical field [0001] The invention belongs to the field of chemical modification treatment of coatings, in particular to a preparation method of tannic acid modified raw lacquer composite coatings. Background technique [0002] Raw lacquer is the secretion of lacquer tree, which is the only natural green paint in the world that can be catalyzed by biological enzymes to form a film at room temperature. The paint film of raw lacquer is hard and bright, and has good properties such as corrosion resistance, abrasion resistance, acid resistance, solvent resistance, heat resistance, water insulation and good insulation. It is a high-quality coating for military industry, industrial equipment, basic construction, handicrafts and civilian furniture, and is also one of the important materials for traditional export in my country. However, due to the large amount of urushiol contained in raw lacquer, there are some disadvantages in raw lacquer, such as serious allergic toxicity to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D193/00C09D7/12C09F1/04
Inventor 王成章周昊
Owner NANJING ZHONGSEN BIOLOGICAL TECH CO LTD