Nanyang explosion-proof motor | How to better improve the quality of coating

2023-11-23 05:27:18

Explosion-proof motors are commonly used in various industries. When environmental conditions are poor, rust stains are prone to occur. Therefore, the quality of coating materials on explosion-proof motors is particularly important. What is the process flow? Now, the Nanyang explosion-proof motor manufacturer will provide you with a detailed explanation:

After the assembly test of the explosion-proof motor is qualified, the topcoat coating is generally carried out using the spraying process. Small motors are easy to use for hanging chain drying operations, while larger motors typically use a single spray drying machine for natural drying.

Paint Type Selection

1. Primer

The current use is epoxy ester primer, which is made of epoxy ester resin, body pigments, rust prevention pigments, combustion aids, drying agents, organic solutions, etc., including iron red, zinc yellow, etc. It belongs to the epoxy anti-corrosion coating series of anti-corrosion coatings. The characteristics are: the paint film is tough and durable, with good adhesion, water resistance, and rust resistance. It has better moisture and salt spray resistance than alkyd primer. Epoxy ester primer is suitable for metal materials and mechanical surfaces as an anti rust primer. It is used for the primer coating of explosion-proof motors and has good adhesion, rust resistance, moisture resistance, and corrosion resistance. The paint used for dipping and spraying can be used, but the viscosity of the paint needs to be adjusted.

2. Topcoat

The current use is acrylic polyurethane enamel, which is a two component acrylic polyurethane paint composed of hydroxyl containing acrylic resin, pigments, additives, solvents, and other components, with hexamethylene diisocyanate (HDI) as the component. The characteristics are: fast drying speed, high gloss, and good leveling; Physical and mechanical properties and adhesion; The paint film is tough and has good wear resistance; Good chemical resistance, water and gasoline resistance; It can be self dried or dried at low temperature. Applied to the surface coating of explosion-proof motors, it has good corrosion resistance, wear resistance, and aesthetics. The paint type does not need to change with the season, but the diluent changes with the ambient temperature.

3. Primer spraying process Spraying process:

Pre degreasing degreasing rust removal cleaning phosphating surface treatment paint mixing spraying drying inspection spraying equipment: degreasing tank, cleaning tank, phosphating tank, paint mixing (bucket), Ford cup, spray gun.

The size of the pool should be matched according to the size of the components.

Parts should be inspected before spraying, and any defects such as cracks, dents, etc. need to be addressed.

The components must be cleaned before spraying. The residual grease of steel plate components after stamping requires degreasing, cleaning, and phosphating treatment.

4. Single spray topcoat and natural drying process painting process:

Preliminary inspection: degreasing, degreasing, drying, paint mixing, rough coating, fine coating, preliminary inspection, drying, inspection.

Painting equipment. Spray gun, paint mixing bucket, Ford cup, crane, lifting appliance.

The basic operation of spraying is the same as above, and it is also divided into coarse coating and fine coating.

The coating under the motor should be lifted by a crane.

The fan hood can be sprayed along with the entire machine or painted separately.

The inspection and other processes are consistent with the suspension chain topcoat coating.

5. The impact of painting process on painting quality: Surface treatment before painting:

Before applying the primer, degreasing, rust removal, and phosphating treatment should be carried out. Otherwise, the grease, rust, dust on the surface of the components, as well as oil stains and sweat stains on the operator's hands, not only hinder the formation of the phosphating film, but also affect the adhesion and corrosion resistance of the primer layer.

The formulation of coatings must comply with regulations, such as the ratio of paint to curing agent, viscosity of paint solution, etc. These factors can affect the drying time, smoothness, fullness, and uniformity of the paint film, directly affecting the appearance of the motor. In addition, the primer and topcoat, as well as the paint and diluent, must be matched, otherwise it may cause paint film detachment, discoloration, and other phenomena.

Painting technique: When spraying, the operator's technique is very important. Improper technique can cause uneven color, sagging, and uneven film thickness.

The impact of drying temperature on coating quality: Improper drying temperature or facilities often lead to unnecessary defects in the paint film, such as decreased adhesion, color differences, insufficient or excessive hardness, and reduced durability. If the drying temperature is too low and the time is too short, incomplete crosslinking and curing reaction of the coating will occur, seriously affecting the mechanical strength and adhesion of the paint film; Excessive drying can also affect the mechanical properties of the paint film, leading to discoloration, loss of gloss, and aging.

The above content is provided by Nanyang explosion-proof motor for your reference, and we hope it will be helpful to you!