Diamond nonstick coating composition and preparation method thereof

Abstract

The invention discloses a diamond nonstick coating composition and a preparation method thereof. The coating composition comprises a primer and a finishing coat, wherein the primer comprises the following components in percentage by weight: 1-5% of carbon black, 5-10% of a surfactant, 10-32% of polytetrafluoroethylene, 10-20% of N-methylpyrrolidone, 30-50% of water, 0-5% of diamond powder and 5-15% of bonding resin, totally 100%; the finishing coat comprises the following components in percentage by weight: 5-20% of a surfactant, 35-50% of polytetrafluoroethylene, 20-40% of water, 0-5% of diamond powder and 15-19% of an organic solvent, totally 100%; the percentages by weight of the diamond powder in the primer and finishing coat are not zero at the same time. The diamond nonstick coating composition disclosed by the invention has excellent coating pencil hardness, heat conductivity and wear resistance.

Description

technical field [0001] The invention belongs to the technical field of non-stick coating production, and relates to the production technology of water-based polytetrafluoroethylene non-stick coating, in particular to a diamond non-stick coating composition and a preparation method thereof. Background technique [0002] Non-stick coating is a special coating whose coating surface is not easily adhered by other sticky substances or easily removed after adhesion. This kind of coating is widely used in household appliances, cooking utensils, automobiles, machinery, chemical industry and other industries due to its anti-adhesive properties such as extremely low surface energy, small friction coefficient and easy sliding. Since DuPont of the United States successfully developed polytetrafluoroethylene (PTFE) non-stick coatings in 1938, it developed PVDF (polyvinylidene fluoride resin) resin construction fluorine coatings in the 1960s. Fluorine-containing resins with functional gr...

AI Technical Summary

Problems solved by technology

Since the non-stick coating uses polytetrafluoroethylene, polyvinylidene fluoride and other organic substances as the non-stick coating, the thermal conductivity is extremely poor. For example, the intrinsic thermal conductivity of polytetrafluoroethylene is 0.24w / m·K, so it is And during use, the thermal conductivity is poor, the heated object heats up slowly, and the energy consumption is high; in addition, polytetrafluoroethylene (PTFE) also has disadvantages such as large wear, large creep, large linear expansion coefficient, and unstable product size.

At present, the thermal conductivity of non-stick coatings is improved by adding fillers with good thermal conductivity such as aluminum powder, alumina powder, silicon carbide, etc. However, the above-mentioned metals, alloys or metal oxides have poor compatibility with solvents, and metals or alloys are easy to be Oxidation, making it have defects such as wear resistance and poor hardness

[0004] Through the search of the prior art, it is found that the patent CN 101717601A discloses a non-stick coating made of polytetrafluoroethylene as a film-forming substance, which is mainly composed of polytetrafluoroethylene, solvent gasoline, alkyd resin, surfactant, Grinding filler, but the PTFE coating has the disadvantages of poor wear resistance and easy scratching

Patent CN 102643582 A discloses a non-stick coating containing main film-forming fluororesin, acrylic emulsion and water, with or without additives. Although its surface has no pinholes and no yellowing defects, it also has wear resistance Insufficient problem

[0005] In summary, the existing PTFE non-stick coatings have problems such as poor thermal conductivity, insufficient hardness, and insufficient wear resistance, which limit their application.