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    Home > Coatings News > Paints and Coatings Market > What is a water-based coating

    What is a water-based coating

    • Last Update: 2020-11-29
    • Source: Internet
    • Author: User
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    What is a water-based coating
    As the name implies, water-based paint is a kind of coating with water as a solvent or dispersion medium, water-based coatings can be divided into three categories: water-soluble coatings, water-diluted coatings, water-dispersed coatings, that is, often called latex coatings.
    water-based coatings in the industry has a wide range of applications, all internal and external wall coatings, metal paint, automotive paint, etc. have the corresponding water-based paint products. Water-based wood paint, wood coatings in the technical difficulty and the highest technical content of products,
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    Advantages of water-based coatings
    ★ Water-based coatings use water as a dispersion medium, using only a small amount of low toxic alcohol ether organic solvents, safe and environmental protection, save resources, eliminate the risk of fire during construction, is conducive to reducing air pollution.
    ★ water-based coatings are very adaptable to the surface of the material, and can also be constructed in wet environments, with strong coating adhesion.
    ★ water-based coating containers and tools can be cleaned with water, and unsopened coatings can be stored in a cool place, saving paint resources and reducing the consumption of cleaning solvents.
    ★ Water-based paint electrophoresis coating film uniform, flattening good, small gaps and corners can be coated with a certain thickness of coating film, construction convenience, good protection performance
    3
    the shortcomings of water-based coating

    ★ is difficult to wet, not soluble, evaporation is susceptible to temperature and humidity, the boiling point of the solvent can control its volatility rate, water-based coatings are more difficult to control.
    ★ water-based coatings are more prone to hang-up than solvent-based coatings. In the construction must control the temperature, humidity, and viscosity of the coating, to ensure that spraying will not occur hanging
    ★ water-based paint in the baking process will appear bubbles, should be imported in the water-based paint preheat (P/H) process, to prevent the baking process such as bubbles, volume shrinkage caused by the flow hanging and other problems.
    4
    operating techniques
    1, with clean water to adjust the paint to the appropriate spray viscosity, to apply -4 viscosity meter measurement, the appropriate viscosity is generally 20 to 30 seconds. If there is no viscosity meter for a while, you can use visual method: with a stick (iron rod or wooden stick) to stir the paint to 20 cm high to stop observation, such as paint liquid in a short period of time (seconds) constant line, it is too thick;
    2, air pressure is best controlled at 0.3-0.4 megapa (3-4 kg force/cm2). The pressure is too small, the paint liquid atomization is bad, the surface will form a numbing point, the pressure is too large and the paint fog is too large, both waste material and affect the health of the operator.
    3, the distance between the nozzle and the surface is generally 300-400 mm is appropriate. Too near easy to hang, too far paint fog is not uniform, easy to appear numb spots, and nozzles far away from the surface paint fog in the way caused waste. The specific size of the distance should be adjusted according to the type of coating, viscosity and the size of the air pressure. Slow dry paint spray distance can be a little far, fast dry paint spray, a little closer, viscosity thick can be closer, viscosity can be a little farther, air pressure can be a little farther, pressure hours can be closer, so-called closer point refers to a small range of adjustment between 10 mm-50 mm, if beyond this range, it is difficult to obtain the ideal paint film.
    4, spray gun can be up and down, left and right movement, it is best to 10-12 meters / minute speed even operation, nozzle to be straight on the surface spray, to minimize oblique spraying. When sprayed to both ends of the surface, the hand of the trigger to quickly loosen, so that the paint fog is reduced, because the two ends of the surface, often to accept more than two spray, is the easiest place to cause hanging.
    5, spraying to the next one to press the next 1/3 or 1/4, so that there will be no leakage phenomenon. When spraying fast dry paint, it needs to be sprayed sequentially at once. The re-injection effect is not ideal.
    6, when spraying in an open place outside, pay attention to the wind direction (high winds should not be suitable for operation), the operator should stand in the direction of the wind, to prevent paint mist from being blown to the sprayed paint film caused by ugly grainy surface.
    7, spraying order is: first difficult, then easy, first in and out. First high and then low, first small area and then large area. This will not cause the sprayed paint mist to splash on the sprayed paint film, destroying the sprayed paint film.
    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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