What is powder coating curing agent

Powder coating is a new type of solvent-free 100% solid powder coating. It has two major categories: thermoplastic powder coatings and thermosetting powder coatings. The coating is made of special resins, pigments, fillers, curing agents and other auxiliaries, mixed in certain proportions, and then prepared by hot extrusion, sifting and sieving. They are stored at room temperature, stable, electrostatic spraying or fluidized bed dip coating, and then heated and baked to melt solidification, so that the formation of a smooth and permanent film, to achieve the purpose of decoration and corrosion. characteristic:

1. The product is non-toxic, solvent-free and contains no volatile and toxic substances. Therefore, there is no poisoning, no fire, no "three wastes" emissions and other public hazard problems, in full compliance with the requirements of the national environmental protection law.

2. The utilization rate of raw materials is high, overspray powder can be recycled, and the utilization rate is over 99%.

3. After the pretreatment of the object to be coated, one-time construction, without primer, can get a sufficient thickness of the coating film, easy to achieve automation, high production efficiency, can reduce costs.

4, coating density, adhesion, impact strength and toughness are good, high corner coverage, with excellent resistance to chemical corrosion and electrical insulation properties.

5, powder coating storage, transportation safety and convenience.

Powder spraying construction process and requirements: The so-called powder electrostatic spraying is the principle of using high-voltage electrostatic corona electric field. A high-voltage negative electrode is connected to the metal deflector on the spray gun head, and the workpiece is grounded to form a positive electrode, so that a strong electrostatic field is formed between the spray gun and the workpiece. When compressed air as a carrier gas, the powder coating is sent from the powder supply tank through the powder pipe to the spray bar of the spray gun, a dense negative charge is generated in the vicinity due to the corona discharge generated when the flow bar is connected to the high voltage negative electrode. The powder carries a negative charge and enters an electrostatic field with a high electric field strength. Under the double action of the electrostatic force and the carrier gas, the powder uniformly flies toward the surface of the grounded workpiece to form a thick and uniform powder layer, which is then heated and cured into a Durable coating. Painting Construction Process Before Treatment One Drying Remove Water One Spray One Inspection One Bake One Inspection One Finished Construction Requirement General Powder Spraying Construction Requirement

(1) In order to give full play to the characteristics of powder coating and extend the service life of the coating, the surface of the coating is first strictly treated

(2) When spraying, the object must be completely grounded to increase the spraying efficiency of the powder coating.

(3) For objects with large surface defects, conductive putty should be coated to ensure a smooth and smooth coating film.

(4) After spraying, the object object must be heated and cured. The conditions for curing should be based on the technical specifications of the powder product. However, the curing temperature and time must be fully ensured to avoid quality failure caused by insufficient curing.

(5) Check immediately after dusting. If defects are found, they should be treated in time. If defects are found after solidification, the scope is small and local without affect. The surface of the object to be coated can be repaired by diluting the same color powder with acetone, if the scope is large. It also affects the surface quality. After polishing with sandpaper, it is sprayed once or the paint remover is used to remove the coating and re-powdered.

(6) After the recycling powder is screened to remove impurities, it is mixed with a new powder in a certain proportion.

(7) The powder supply tank, powder spray room and recovery system should avoid the pollution of other different color powders, so be sure to blow clean every time you change color.

2. Art powder spraying construction requirements: Fine art powder, beautiful appearance, strong three-dimensional effect, decorative effect, etc., but its construction process requirements are strict.

(1) The input air pressure during dusting should not be too large, and the general control is 0.5-1.5kg/cm2. Too much pressure will result in poor visibility or some pitting. Static voltage should not be too high, generally controlled at about 60-70Kv. If the voltage is too high, the powder attached to the surface of the workpiece will bounce back and appear pitted. Poor leveling and other defects.

(2) Spraying powder should pay attention to ensure that the thickness of the coating film is generally controlled between 70-100μm in order to facilitate the formation of obvious patterns and larger patterns. The thin film is not obvious, and the pattern is also small. There are pit defects and other defects

(3) Baking must be performed at the prescribed temperature and time when curing. If the temperature is too low for too long, the powder will not be patterned, and at the same time, the mechanical properties will be greatly reduced due to incomplete curing. In addition, due to the particularity of the art pattern powder production process, after the re-spraying with the recycled powder, the pattern will be smaller or not obvious changes, so it is generally recommended not to use recycled powder of art-type powder. To use must also be tested. Although the requirements for construction are stricter from the above perspective, it is believed that as long as the above factors are well grasped in the coating process, the desired satisfactory results will be achieved. Storage and use of powder coatings

1, away from the fire source, to avoid direct sunlight, should be placed in a well-ventilated, temperature below 35 °C places.

2. Avoid storing in locations that are vulnerable to water, organic solvents, oil, and other materials.

3, after the powder coating is not exposed to the air, should be stamped or tightly closed at any time to avoid mixed materials.

4. Avoid prolonged skin contact. The powder adhered to the skin should be rinsed with soapy water. Do not use solvents. Painting site construction safety

l. The equipment used in the painting operation must be completely grounded to eliminate static electricity.

2. Avoid the phenomenon of no-end discharge of the coating machine

3. In the dusting room, the concentration of floating dust should be controlled below the safe concentration as far as possible to avoid the danger of dust explosion.

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