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

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...