Finishing coat of aqueous non-viscous paint

Abstract

The invention provides a finishing coat of aqueous non-viscous paint, which comprises the following raw materials in percentage by weight: (1) 50-71% of fluorine-carbon polymer, (2) 1.5-5% of surfactant, (3) 2-6% of solvent, (4) 0.2-0.6% of thickening agent, (5) 0.5-5% of colour filler and (6) the balance of purified water. The finishing coat of the aqueous non-viscous paint is hardly influenced by the performance fluctuation of the fluorine-carbon polymer, especially the finishing coat of the aqueous non-viscous paint, which uses the following fluorine-carbon polymers, can also obtain favorable paint storage stability and spraying application performance and enhances the chemical prevention performance, the durability, the spraying thickness and the filming compactness of a coating. The invention can adopt PFOA which is popularized at home and abroad now and a fluorine-carbon polymer of salt thereof as main resin and fluorine-carbon polymers with more economy.

Description

technical field [0001] The present invention relates to a kind of topcoat of water-based non-stick coating, especially refers to the use of fluorocarbon polymer containing slightly perfluorooctanoic acid (PFOA) and its salt which is being promoted at home and abroad as the main resin; and more economical fluorocarbon polymer Under certain circumstances, it can also obtain good coating storage stability and spray application performance, improve the chemical resistance and durability of the coating, sprayable thickness and film-forming compact water-based non-stick coating topcoat. Background technique [0002] Supporting and developing the use of more environmentally friendly and healthy fluorocarbon polymers mainly refers to the fluorocarbon polymers that are currently being promoted at home and abroad that contain slightly perfluorooctanoic acid (PFOA) and its salts. [0003] Perfluorooctanoic acid and its salts, especially ammonium salts, such as ammonium perfluorooctanoa...

AI Technical Summary

Problems solved by technology

[0010] ①The storage stability of the paint has dropped significantly, especially the shelf life under the 49°C test environment is only about three months, which is nearly half of the original

[0011] ② There are many defects in the construction process, such as spraying construction, which is easy to produce spray particles or block the spray gun

Most of the economical PTFE, due to the difference in resin polymerization, dispersion, formula or process, has a certain gap in terms of chemical resistance compared with high-end products.

[0014] In addition, considering that its main raw material polytetrafluoroethylene (PTFE) has an obvious defect: because its melt viscosity is very high, leveling is difficult, and the coating film is easy to form pinholes

This will cause the gravity sinking of the fluorocarbon polymer and filler in the coating, the aggregation of the particles, the abnormal viscosity, and as the storage time of the coating prolongs, precipitation will form, harden and gel, making it difficult to redisperse. Until the paint is scrapped

During the application of such coatings, the spraying gun will be blocked, the surface of the sprayed workpiece will have coarse particles, and the viscosity will be abnormal, resulting in poor leveling or sagging of the coating.

Affects the construction of the coating, the appearance and application performance of the coating

[0017] 2. The maximum constructable thickness (critical cracking thickness) is too low, usually only about 15 microns. If it exceeds this thickness, the coating may crack during the baking process; it is far below the 40-60 of similar high-end products micron level of excellence

[0018] 3. Because the thickness can only be lower than the standard construction, the chemical resistance of the coating is reduced

The maximum constructable thickness of the coating (critical cracking thickness) is too low, resulting in poor melt leveling and poor compactness of the coating film; the coating film will appear bulky, pinholes, cracks or cracks

Images