The characteristics of powder coatings and the construction process

First, the characteristics of powder coating 1 The product is not toxic, does not contain solvents and does not contain volatile toxic substances, so there is no poisoning, no fire, no "three waste" emissions and other public hazards, in full compliance with the requirements of the National Environmental Protection Law. 2 High utilization rate of raw materials, over-sprayed powder recyclable, utilization rate of more than 99%. 3 After pre-treatment of the coating, one-time construction, without the need for the bottom coating, you can get a sufficient thickness of the coating film, easy to achieve automated operation, high production efficiency, can reduce costs
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. 4 The coating is dense, adhesive, impact-resistant and tough, with high corner coverage, excellent chemical corrosion resistance and electrical insulation. 5 Powder coating storage, transportation safety and convenience. Second, powder spraying construction process and the requirements of the so-called powder electrostectrulation spraying is the use of high-voltage electrostration corona electric field principle. The high-pressure negative is connected to the metal conduction mark of the head of the spray gun, and the ground of the sprayed work piece forms a positive pole, which makes a strong electrostation field between the spray gun and the work piece. When the compressed air as a carrying gas, the powder coating from the powder barrel through the powder pipe to the gun's conduction rod, due to the conduction rod connected to the high-pressure negative electrode generated by the corona discharge, in its vicinity produced a dense negative charge, so that the powder on the negative charge, and entered the electrostature field with high electrostatist intensity, in the static electricity and carrying gas under the dual action, the powder evenly flew to the surface of the grounding parts to form a thick, uniform coating, and then heating into a solidified film. Coating construction process: pre-treatment of a dry removal of water one spray one inspection one baking one inspection one finished product three, construction requirements 1 general powder spray construction requirements (1) in order to make the special properties of powder coating to give full play to and extend the service life of the coating, the surface of the coating first strictly pre-surface treatment. (2) When spraying, the coating must be completely grounded to increase the spray efficiency of powder coating. (3) For coatings with large surface defects, the conductive putty should be scraped to ensure the smoothness and smoothness of the coating film. (4) After spraying, the objects shall be heated and cured, and the curing conditions shall be based on the technical indicators of the powder product, but the curing temperature and time must be fully guaranteed to avoid quality accidents caused by insufficient curing. (5) powder immediately after inspection, if found defects should be treated in a timely manner, if cured after the discovery of defects, its scope is small only local without impact, the surface decoration of the coating, can be diluted with the same color powder with acetone for repair, if the range is large and affect the surface quality, then sandpaper polished, then sprayed once or with paint remover coating, and then re-spray powder. (6) Recycled powder must be screened to remove debris, according to a certain proportion of the new powder mixed effect. (7) Powder barrels, powder spray rooms and recycling systems should avoid contamination of other different color powders, so every time the color change must be blown clean. 2, art-type powder spray construction requirements: art-type powder, with beautiful, strong three-dimensional sense, decorative effect and so on, but its construction process requirements are strict. (1) when spraying powder input air pressure should not be too large, generally controlled at 0.5-1. 5kg/cm2 is good. Too much air pressure can cause poor pattern clarity or produce some hemp points. Static voltage should not be too high, generally controlled at 60-70Kv or so. The voltage is too high, which causes the powder attached to the surface of the work piece to bounce back into a puddle. Defects such as poor leveling. (2) Powder should pay attention to ensure the thickness of the coating film, generally controlled between 70-100 m can be conducive to the formation of obvious patterns and larger patterns, coating thin pattern is not obvious, and the pattern is small, at the same time there will be defects such as hemp bottom (3) curing must be baked according to the prescribed temperature and time. If the temperature is too low for too short a time will cause the powder shape is not patterned, and due to curing incomplete mechanical performance is also greatly reduced. In addition, due to the particularity of the art-type pattern powder production process, with recycled powder re-sprayed, its pattern will become smaller or less obvious changes, so it is generally recommended that the art-type powder recycling powder should not be used. To be used, it must also be tested. From the above point of view, although its construction requirements are more stringent, but I believe that the coating process as long as a better grasp of the above factors, will certainly achieve the ideal satisfactory results. 4. The storage and access of powder coating 1 away from the source of fire, to avoid direct sunlight, should be placed in a well-ventilated, temperature below 35 degrees C. 2 Avoid storage in sites susceptible to contamination by water, organic solvents, oils and other materials. 3 Powder coating should not be exposed to the air at will, should be covered or tightened bag mouth at any time to avoid debris mixed in. 4 Avoid long-term skin contact, adhere to the skin powder is rinsed with soapy water, do not use solvents. V. The safety of the coating construction site 1 The equipment used in the coating operation should be well grounded to eliminate static electricity. 2 Avoid unprovoked discharge of the coating machine