PTFE coatings (polytetrafluoroethylene) are non-stick, fluoropolymer containing high temperature coatings, they have a single coating system or a double coating system of primer and top coat, and have a variety of properties. The Teflon spray process is an important surface treatment that gives objects outstanding properties. With the right preparation, spraying procedures and techniques, Teflon sprayed coatings of high quality can be achieved.

So, do you know how Teflon paint is sprayed? What are the spraying methods of Teflon paint? What are the advantages of Teflon paint?

Spray-Painted Method

There are two main spraying methods for Teflon coatings: dispersion coating and powder coating.

Dispersion coating

The processing method of dispersion coating is a wet processing method in which the coating material is evenly distributed in the solvent to form a dispersion liquid (solid substance mixed in the liquid). This mixture is atomized by high-pressure air and sprayed on the surface of the workpiece.

The specific spraying process is divided into several steps: preparation of workpiece - spraying of wet dispersion coating - drying - sintering.

(1) Wet dispersion coating spraying: spraying coating materials must be uniform; And depending on the coating system used, the coating thickness can vary from a few microns to 200 microns.

(2) Drying is to heat the wet coating in an oven at a temperature controlled below 100°C until most of the solvent has evaporated.

(3) Sintering is to heat the workpiece to a higher temperature until an irreversible reaction occurs and the coating material melts with the bonding agent to form a network structure.

Powder Coating

The powder coating is a dry process in which the powder particles are attached to the workpiece and then the coated powder is melted in the oven. The coating material used here is in the form of small solid particles. The use of this coating method avoids the divergence phenomenon that occurs when the solvent is used and the subsequent coating is attached.

The processing of powder coating is divided into the preparation of the workpiece - powder spraying - powder melting steps, among which, powder spraying refers to the powder particles blown out of the collector by compressed air, there is a section of electrostatic area on the way to the spray gun nozzle, the powder particles are attracted by the workpiece and attached to it.

But no matter what kind of spraying method, one thing needs to be done first in the spraying process - the preparation of the workpiece, that is, in order to obtain sufficient surface adhesion of the workpiece surface, it is necessary to remove all the grease on the surface to be coated.

We use organic solvents to dissolve oils and fats and heat them to about 400°C to completely volatilize them. Next, the mechanical way of sandblasting is used to clean the parts and make the surface rough, and the bonding ability of the coating and the surface of the workpiece can be improved by applying bonding additives and primer.

Advantages of spraying ‍

Heat resistance

Teflon industrial coatings work continuously at temperatures up to 260°C/500°F; Under the condition of ensuring adequate ventilation, the short-term service temperature can reach 315°C/600°F.

Low friction coefficient

The coefficient of friction of Teflon coatings is generally in the range of 0.05 to 0.20, depending on the load, sliding speed, and the specific Teflon coating type used.

Low temperature stability

Many Teflon industrial coatings can withstand harsh extreme temperature conditions without damaging their physical properties. Teflon industrial coatings can be used at low temperatures as low as -270°C/-454°F.

Non-wettability

Since teflon coated surfaces are both oil - and hydrophobic, they are not easily wetted. Cleaning is easier and more thorough - in many cases, these surfaces can be self-cleaning.

Unique electrical properties

Over a wide frequency range, teflon coatings have very high insulation strength, very low dielectric constant, and very high surface resistance. With special techniques, the material can even be electrically conductive enough to be used as an antistatic coating.

Chemical resistance

Normally, teflon is not affected by the chemical environment. The only two chemicals known to affect industrial coatings on teflon are molten alkali metals and highly reactive fluorinating agents.

Teflon coatings have the highest operating temperature of any fluoropolymer at 500°F, low coefficient of friction, and good chemical and wear resistance, making them widely used. In addition to its applications in cookware, industrial Teflon coatings are often used in the automotive industry, wiring materials, optical devices, pharmaceutical applications, pipes, valves, etc.