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Technical characteristics and application of automatic painting equipment spraying technology
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Information source: Date of this site: 2015-05-07
Plastic Network News: The base material is not limited, it can be metal and non-metal. It can spray a wide range of coating materials on various base materials. Thermal spray technology can be used to spray almost all solid engineering materials, such as hard Alloys, ceramics, metals, graphite, etc .; the base material has a small temperature rise during the spraying process without stress and deformation; the operation process is flexible and convenient, and is not restricted by the shape of the workpiece, and the construction is convenient; the coating thickness can be from 0.01 to a few millimeters; the coating Various performances, can form coatings with various special functions such as wear resistance, corrosion resistance, heat insulation, oxidation resistance, insulation, conductivity, and radiation protection; strong adaptability and good economic benefits. . Whitening, low temperature, easy to form surface moisture of substrate, relative humidity> 85 °%, moisture content of board> 12% will be whitening.
1. Add 3-10 white water to the diluent and mix after construction; wipe off the moisture accumulated on the surface of the substrate with a dry towel before construction; properly extend the recoating time during the wet-to-wet process construction, and the recoating time must be sufficient It does not exceed 2 hours in 60 minutes, and can only be used for wet-on-wet process construction at a time. After that, the paint film must be completely dry after sanding and then applied; after water-milling, it must be dried for 12 hours and then recoated; after the board is purchased It must be closed once with Bottom Depot, which can effectively prevent the moisture in the board from penetrating into the paint film;
2. Pinholes, air bubbles, deep wooden eyes on the surface of the wood, poorly sealed paints dry slowly and easily form pinholes from sinking in the wooden eyes; deep wooden eyelets contain air, and the paint penetrates downward to squeeze out air to produce paint film bubbles. Solution: After the board is purchased, it must be closed again with bottom Depot, which can effectively prevent the paint from sinking and forming pinholes; bottom Depot can penetrate the strong squeeze air to solve the paint film bubbles.
3. If water-polishing is required, the surface of the board must be completely dry (48 hours in summer and 96 hours in winter) before it can be polished, otherwise the paint film can not be expected to obtain the mist. The construction temperature of wall latex paint is <5 ° C. The phenomenon of paint disease that is caused by slow drying when painting wood paint in a warm environment is: sagging, slow-drying or non-drying, sticking back, bottoming, wrinkling, whitening, Pinholes, air bubbles. When windy and foggy weather occurs, the temperature is <5 °, and the relative humidity is> 85 °. Sagging ---- The paint is flowing due to low temperature and slow drying, forming uneven thickness of the paint film, such as hanging curtains, and light, such as beaded tear marks.
： Solution :
Use winter thinner to speed up the drying of the paint; do not apply thickly, but should be applied twice or more; extend the recoating time, wait for the upper paint to dry thoroughly before applying the next paint; add a little thinner appropriately To increase paint viscosity. Slow-drying or non-drying, sticking back, biting the bottom, wrinkling, the temperature is too low, the solvent cannot be completely evaporated, resulting in poor curing of the paint film. Solution: Use winter thinner to speed up paint drying; properly increase the coating curing agent ratio of the coating equipment (increase within 20%, otherwise the paint film becomes brittle), and promote fast curing of the paint film; ensure good ventilation, Allow the solvent method to completely evaporate to prevent sticking; extend the recoating time and wait for the upper paint to dry completely before applying the next paint; so as to avoid the thinner dissolving the upper paint and causing bite when the next paint is not cured. Bottom, wrinkled. Relative humidity> 85 °%, oilers are required to stop construction, otherwise it will cause powdering, paint film loss of light, water shadow and other phenomena due to poor film formation.
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