Teflon spray process

       

Teflon spray process

1. Dispersion coating

 

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

 

The processing steps of dispersion coating are divided into the following steps:

 

1. Preparation of the workpiece

 

2. Wet dispersion coating spraying

 

3. Dry

 

4. Sintering

 

Workpiece preparation

 

In order to obtain sufficient surface adhesion on the surface of the workpiece, all the grease on the surface to be coated must first be removed. We use organic solvents to dissolve the grease and heat it to about 400°C to completely volatilize it. The next step is to clean the workpiece and make the surface rough by mechanical means of sandblasting. The bonding ability of the coating with the surface layer of the workpiece can be improved by applying bonding additives and primers.

 

Wet dispersion coating spraying

 

The spray coating material must be uniform. The thickness of the coating depends on the coating system used. The thickness of the coating may vary from a few microns to 200 microns-0.2 mm.

 

The wet coating is heated in the oven, and the temperature is controlled below 100°C until most of the solvent has evaporated. The sintering step is to heat the workpiece to a higher temperature until an irreversible reaction occurs. The coating material melts with the bonding agent to form a network structure.

 

2. Powder coating

 

The powder coating processing method is a dry processing? The coating material used here is in the form of extremely fine solid particles. The use of this coating method avoids the use of solvents and subsequent divergence that occurs when the coating is attached. The processing adopts a proper method to make the micro-powder-like coating particles adhere to the workpiece, and then the coated micro-powder is melted in the oven.

 

The powder coating processing procedure is divided into the following steps:

 

1. Preparation of the workpiece

 

2. Powder spraying

 

3. Powder melting

 

Workpiece preparation

 

In order to obtain sufficient surface adhesion on the surface of the workpiece, all the grease on the surface to be coated must be removed first. We use organic solvents to dissolve the grease and heat it to about 400°C to completely volatilize it. The next step is to clean the workpiece and make the surface rough by mechanical means of sandblasting. The bonding ability of the coating with the surface layer of the workpiece can be improved by applying the bonding agent primer.

 

Powder spraying

 

The powdery particles are blown out of the trap by compressed air. On their way to the nozzle of the spray gun, there is an area charged with static electricity. Because the particles have the same electric charge, they repel each other on their flight paths and form a uniform cloud-like spray. The workpiece to be sprayed is grounded so that an electrostatically charged area is formed between the spray gun and the workpiece. The powdery particles are attracted to the workpiece and adhere to it.

 

Powder melting

 

There are principle differences between high-temperature spraying and low-temperature spraying in coating technology. If the temperature of the high-temperature spraying substrate is higher than the melting temperature of the powder material, the powdery particles are coated on it, so that the fine powder is melted during the spraying process. The processing method of low temperature spraying is that the temperature of the substrate is lower than the melting temperature of the powder material. The melting is then carried out in an oven.