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Dendritic polyamide-amine modified raw lacquer coating and preparation method thereof

A polyamide and dendritic technology, applied in the field of dendritic polyamide-amine modified lacquer coating and its preparation, can solve the problems of poor weather resistance, high viscosity, difficult construction, etc., to improve physical and mechanical properties, improve durability Impact, gloss improvement effect

Active Publication Date: 2020-02-11
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although raw lacquer has the above-mentioned advantages and uses, it also has some disadvantages. It requires relatively harsh conditions for curing and forming a film at room temperature, and it takes a long time to dry. Under ultraviolet light, the color and gloss are easily reduced, and the weather resistance is poor; The alkali resistance is not very good; the color is too dark, the color is single; the viscosity is too high, it is not easy to construct

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dendritic polyamidoamine was added to the lacquer according to 1.5% of the mass of the lacquer, and the two were fully mixed at room temperature using a magnetic stirring method. Then, a film was coated on the polished tinplate sheet with a film thickness of 75 μm; finally, it was dried at 120 °C for 6 h to form a dendritic polyamide-amine modified lacquer coating. The adhesion performance of the dendritic polyamide-amine modified raw lacquer coating reaches grade 0; the measured gloss value is 90.0; the bending performance reaches 1 mm cylinder; the impact resistance performance reaches 70 cm; the pencil hardness is greater than or equal to 6H; it is acid and alkali resistant after 7 days There was no shedding or wrinkling in the salt test, and the alkali resistance was improved compared with pure raw lacquer.

Embodiment 2

[0023] Dendritic polyamidoamine was added to the raw lacquer according to 2% of the mass of the raw lacquer, and the two were fully mixed at room temperature using a magnetic stirring method. Then, a film was coated on the polished tinplate sheet with a film thickness of 75 μm; finally, it was dried at 120 °C for 6 h to form a dendritic polyamide-amine modified lacquer coating. The adhesion performance of the dendritic polyamide-amine modified raw lacquer coating reaches grade 0; the measured gloss value is 91.8; the bending performance reaches 1 mm cylinder; the impact resistance performance reaches 70 cm; the pencil hardness is greater than or equal to 6H; acid and alkali resistance after 7 days There was no shedding or wrinkling in the salt test, and the alkali resistance was improved compared with pure raw lacquer.

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Abstract

The invention discloses a dendritic polyamide-amine modified raw lacquer coating and a preparation method thereof. The preparation method comprises the following steps: taking a natural polymer raw lacquer as a main body, adding dendritic polyamide-amine accounting for 0.2-5% of the mass of the raw lacquer into a raw lacquer solution, fully and uniformly mixing the dendritic polyamide-amine and the raw lacquer solution at room temperature in a magnetic stirring mode, and then coating various common carriers with the obtained mixture to form a film with the thickness of 75-100 [mu]m; and dryingthe film at 120 DEG C for 6 h to form the dendritic molecular modified raw lacquer coating. The dendritic molecular modified raw lacquer coating has the good corrosion resistance of the pure raw lacquer, improves the adhesion of the raw lacquer to plastics, metals, glass and the like through crosslinking of urushiol serving as the main component of the raw lacquer and dendritic polyamide-amine, improves the hardness and the elasticity of the raw lacquer, improves the glossiness of the raw lacquer, obviously improves the impact resistance of the raw lacquer, and improves the alkali resistanceof the raw lacquer.

Description

technical field [0001] The invention belongs to the field of wooden furniture coatings and external anti-corrosion coatings for equipment, in particular to a dendritic polyamide-amine modified raw lacquer coating and a preparation method thereof. Background technique [0002] Raw lacquer, commonly known as "earth lacquer", also known as "national lacquer" or "big lacquer", is a natural polymer substance, which is a milky white milky liquid that flows out from the cut of the phloem of the sumac tree. Raw lacquer components include: 60-65% of urushiol belonging to oils, 5-7% of water-soluble polysaccharides (colloids), about 0.1% of laccase, and glycoproteins (nitrogen-containing) that are insoluble in water and organic solvents. matter) 3 to 5%, and water 25 to 30%. These ingredients combine to form a water-in-oil spherical (W / O type) emulsion. When exposed to the air, its color changes from light to black due to oxidation, and condenses into a layer of black, bright and el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D193/00C09D5/08C09D7/65
CPCC09D5/08C09D193/00C09D7/65C08L79/02
Inventor 林枞张鼎林棋夏建荣
Owner FUZHOU UNIV
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