What is the difference between liquid coating and solid coating?

February 24, 2023
February 24, 2023 Longchang Chemical

What is the difference between liquid coating and solid coating?

1、Liquid coating coating technology

1.1、Brushing

Brush coating is the most widely used, but the coating efficiency is low, the production scale reaches a certain level, and the manufacturers who have certain requirements for production efficiency cannot tolerate this primitive coating method. And the quality of type core coating is not good, there are brush marks on the surface of the coating, and there is a big waste of paint, which requires high coating technology.

 

1.2、Spraying

Spraying is the most widely used coating technology in mechanical and electronic industry, and it is also the most polluting process among all coating processescoatingol.com. It is a method to make liquid paint atomized into mist and sprayed to the surface of the object to form a coating.

 

1.3、Dip coating

Dip coating is mainly applied to small type core. Dip coating is a coating method in which all the paint is immersed in a container with paint, and then removed from the tank after a short period of time, and the excess coating liquid is re-flowed back into the tank. There is no problem of “flying paint”, but there is a problem of solvent evaporation and a small amount of dripping paint on the ground.

 

1.4、Flow coating

Flow coating is widely used for sand core and small and medium-sized castings to apply coatings. Flow coating is to use the pump to squeeze out the paint from the nozzle with a pressure of 0.02MPa~0.2MPa and coat the workpiece on the conveyor. Excess paint, overflow dripping drops are returned to the storage tank for recycling. The flow coating has no brush marks, smooth surface, high surface quality, saves paint, low environmental pollution, and is not only suitable for sand core but also for casting.

 

1.5、roll coating

It is used for single-sided or double-sided high-speed continuous mechanical coating of thin plates or strips. It will be dipped in the paint of the rotating coating roller to “transfer” the paint to the surface of the workpiece, forming the required thickness of the paint film.

 

1.6、Curtain Coating

Curtain coating is mainly used for thin plate or strip coating. The paint is pumped or overflowed by gravity through adjustable gaps to form a “curtain” that coats the surface of the workpiece. Curtain coating is a high-speed coating process with minimal paint loss.

 

1.7、Roll coating or rotating drum coating

Roll coating or rotating drum coating can control the precision and flatness of the plate more effectively, and successfully eliminate the traditional cause of bump and wrinkle, so it is often used for small parts such as screws, nuts and small screws with a single weight less than 0.5kg. It is a process of spilling a certain amount of paint in the drum or rotating drum that holds the workpiece, so that the paint is evenly coated and glued to the surface of the workpiece.

 

1.8、Electrophoretic coating

Mainly refers to “cathodic electrophoretic coating”, which is widely used in the motor vehicle industry and promoted to the industrial fields such as building materials, light industry, household appliances and the surface corrosion and decoration of hardware and handicrafts. Cathodic electrophoresis is the movement of positively charged cationic resin to the cathode after electrification, and the cathodic coating is precipitated onto the specimen as the pH value near the cathode rises and particle exchange occurs.

 

2、Solid coating technology

 

Solid state coating is “powder coating”. It does not use solvents, but covers the workpiece with fine powder of coating material, and then melts it at a temperature exceeding the melting point of the powder to form a paint film on the workpiece. Powder coating includes three processes: “electrostatic spraying”, “fluid bed” and “electrostatic fluid bed”. Under the condition that the powder is collected and reused, the utilization rate of powder coating is almost 100%. “Electrostatic spraying” uses electrostatic adsorption to adsorb the powder coating onto the workpiece at room temperature, and then heats up and melts to form a paint film. “Fluid bed” is to place the workpiece, which has been preheated to above the melting temperature of the coating, into the fluidized suspended coating powder, and the coating powder in contact with the workpiece is melted and coated on the workpiece to form the coating film. “Electrostatic fluid bed” is to set the electrode in the powder chamber, so that the fluid bed coating powder negative charge adsorption on the grounded workpiece. Powder coating does not have the problem of solvent pollution, the main problem is the recycling of coating powder.

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