Powder coating is a new type of 100% solid powder coating does not contain solvents. There are two broad categories: thermoplastic and thermosetting powder coatings powder coatings. Coating consists of special resin, fillers, curing agent and other auxiliaries, mixed at a certain proportion, then by hot extrusion and crushing sieving process preparation. Them at room temperature, storage stability, the electrostatic spraying or fluidized bed dip coating, reheat continuous curing, the formation of smooth and shining permanent coating, to achieve the purpose of decoration and corrosion resistance.

A, the characteristics of powder coatings

1, this product contains no toxicity and contains no solvents and excluding volatile toxic substances, therefore, no toxicity, no fire, no pollution problems such as "three wastes" emissions, completely conform to the requirements of national environmental laws.

2, high utilization rate of raw materials, spray powder can be recycling, utilization rate of more than 99%.

3, after coating pretreatment, one-time construction, without bottom coating, can get enough thickness of coating, easy to realize automation, high production efficiency, reduces the cost.

4, coating density, adhesion, impact strength and toughness were good, edge horn coverage rate is high, it has excellent chemical corrosion resistance and electrical insulation properties.

5, powder coating storage, transport safety and convenience.

Second, the powder coating construction technology and requirements

The so-called powder electrostatic spraying is the principle of using high voltage electrostatic corona electric field. On the diversion standard spray gun head metal connected to high voltage anode, by spraying the workpiece grounding form the positive, between the gun and workpiece to form a strong static electric field. When compressed air as carrier gas, the powder coating powder for powder from the barrel of the pipe to the spray gun guide rod, because the guide rod connected to high voltage anode of corona discharge, near its produced negative charge, make the powder with negative charge, and entered into the field intensity high electrostatic field, under the dual role of electrostatic force and the carrier gas, powder evenly to ground surface formation thickness uniformity of powder layer, heat curing into durable coating.

Coating process flow: dealing with a dry remove moisture, spraying inspection before a baking a check a finished product

Three, the construction requirements

1, general powder coating construction requirements

(1) to make the characteristics of the powder coating can give full play to and prolong the service life of coating, broken coating surface first strictly before surface treatment.

(2) when spraying, the coated material is completely grounding, in order to increase the powder coating spray efficiency.

(3) to have larger surface defects of the coated material, scraping conductive coating must be bored with child, and to ensure that the coating level off and smooth feeling.

(4) after spraying objects objects require heating curing, curing conditions will be subject to powder product technical indicators but must fully ensure the curing temperature and time, avoid inadequate curing quality accident.

(5) powder immediately after inspection, if discover the defect should be handled in time, if finding defects after curing, the only local without affecting the smaller range, the coated surface decoration, color powder can be used with the acetone diluted to repair, if large range and influence the surface quality, use sand paper burnish, after spraying again or use the paint remover to remove coating, Suo powder again.

(6) after recovery powder must be filtered to remove impurities, according to certain proportion and the new powder mixing action.

(7) for powder barrels, powder spraying rooms and other different color powder recovery system should avoid pollution, therefore, must purge clean each time you change the color.

2, art type powder coating construction requirements: art type powder, with beautiful, stereo sense is strong, decorative effect rape etc., but the strict construction technology.

(1) powder when input pressure shoulds not be too big, general control in 0.5 1.5 kg/cm2. Too much pressure can cause poor pattern sharpness or produce some pitting. Electrostatic voltage is unfavorable and exorbitant, general control around 60-70 kv. Voltage is too high, can make the attached to the surface of powder ma pit rebound occur. Such problems as poor flow flat.

(2) powder attention should be paid to ensure that the thickness of the coating, general control between 70-100 microns can benefit form obvious pattern and large decorative pattern, thin film, decorative pattern is not obvious, and decorative pattern is small, can appear the defects such as pitting show at the same time

(3) must be in accordance with the provisions, the temperature and curing time for baking. If the temperature is too low for too short will cause the powder not form pattern, at the same time for curing not thorough mechanical properties are greatly decreased. In addition, because of the particularity of art type pattern powder production process, the recycled powder spray, the pattern will become smaller or not obvious changes, so the general recommendation art type powder recovery powder do not use. Want to use is subject to test. Seen from the above, though more strict with its construction, but believe that as long as the better grasp the above factors in the process of coating, is bound to achieve satisfactory effect.

Four, the storage and access of powder coatings

1, away from fire, prevent sun direct illuminate, should be placed in a well ventilated, temperature under 35 ℃.

2, avoid stored in vulnerable to water and organic solvents, the place of oil pollution and other materials.

3, powder coating after using your own dew in the air, shall, from time to time stamp or turn close mouth to avoid clutter.

4, avoid skin contact for a long time, attached to the skin powder soap water is rinsed clean, do not use solvents.

Five, the coating construction site safety

L, surfacc preparation equipment shall be in good condition of grounding is used to eliminate static electricity.

2, avoid coating machine discharge phenomenon

3, powder spraying indoor, floating dust concentration control below safe levels, as far as possible avoid dust explosion due to fire risk.