Basic knowledge of water-based paint and seven con

2022-07-22
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Basic knowledge and seven construction skills of water-based paint

Introduction to water-based paint

all coatings using water as solvent or dispersion medium can be called water-based coatings. Water based coatings include water-soluble coatings, water dilution coatings and water dispersible coatings (latex coatings). Water soluble coatings take water-soluble resin as film-forming material and polyvinyl alcohol and its various modifiers as representatives. In addition, there are water-soluble alkyd resin, water-soluble epoxy resin and inorganic polymer water-based resin

advantages of water-based paint

1 Water based coatings use water as solvent, which saves a lot of resources; The water-based coating eliminates the fire hazard during construction; Reduce air pollution; Only a small amount of low toxic alcohol ether organic solvents are used in water-based coatings, which improves the working environmental conditions

2. Water based coatings can be applied directly on wet surfaces and in wet environments; The water-based coating has good adaptability to the material surface and strong coating adhesion

3. Water based coating tools can be cleaned with water, greatly reducing the consumption of cleaning solvent

spraying method is one of the most important methods in the construction of water-based coatings. Coating the surface of objects with spraying method can obtain a thin and uniform film. For a few places with different shapes, small holes, gaps and uneven, the coating can be evenly distributed; For spraying large surfaces, this method is faster and more useful than painting

but it is also necessary to master some operating tricks when using spraying method for construction:

1

first, adjust the paint to the viscosity suitable for spraying with clean water, and measure it with tu-4 viscometer. The suitable viscosity is generally 20 ~ 30 seconds. If there is no viscometer at the moment, visual inspection method can be used: stir the paint evenly with a rod (iron rod or mallet) and lift it to a height of 20cm to stop for observation. If the paint solution does not line in a short time (a few seconds), it is too thick; If the line breaks as soon as it leaves the top edge of the barrel, it is too thin. When you want to stay at a height of 20 cm, the paint liquid forms a straight line, which will stop flowing and become dripping in an instant. This viscosity is more suitable

2

second, the air pressure is best controlled at 0.3~0.4 MPa (3~4 kgf/cm2). If the pressure is too small, the paint liquid atomizes poorly, and the appearance will form pitting; Excessive pressure is easy to flow and hang, and the paint mist is too large, which not only wastes the paint, but also affects the health of operators

3

third, the spacing between the nozzle and the object surface is generally 300 mm ~ 400 mm. When it is too close, the paint film is easy to flow and hang; If the paint mist is too far away, it is uneven, easy to show pockmarks, and the nozzle is far from the surface of the object, so the paint mist will consume materials if it flies away on the way. The specific size of the interval should be properly adjusted according to the variety, viscosity and air pressure of the coating. The spraying interval of slow drying paint can be longer, and the spraying interval of fast drying paint can be closer; When the viscosity is thick, it can be closer, and when the viscosity is thin, it can be farther; When the air pressure is high, the interval can be farther, and when the pressure is small, it can be closer; The so-called closer and farther means a small range of adjustment between 10mm and 50mm. If it goes beyond this range, it is difficult to obtain a better paint film

4

fourth, the spray gun can move up and down, left and right. It is best to operate evenly at a speed of 10~12 M/min. the nozzle should be straight to the surface of the object for spraying, and oblique spraying should be reduced as far as possible. When spraying on both ends of the surface, the hand that pulls the trigger of the spray gun should be quickly loosened to reduce the paint mist. Because both sides of the surface often need to be sprayed more than twice, it is the easiest place to form sagging

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fifth, when spraying, the next layer should press 1/3 or 1/4 of the previous one, so as not to show the phenomenon of missing spraying. When spraying quick drying paint, it needs to be sprayed in sequence at one time, and the effect of supplementary spraying is generally unsatisfactory

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sixth, when spraying outdoors in an empty place, pay attention to the wind direction (it is not suitable to work in strong wind). The operator should stand in the downwind direction to prevent the paint mist from being blown by the wind to the sprayed paint film to form an ugly granular appearance

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seventh, the spraying order is: difficult first, easy second, inside first, and then outside. High place first and then low place, small area first and then large area, so that the sprayed paint mist will not splash on the sprayed paint film and damage the sprayed paint film

Shandong Penglai Luyuan paint industry Co., Ltd., founded in 1998, is a high-tech enterprise in Shandong Province specializing in the R & D, production and sales of environmental friendly water-based paint in China. With "infinite flower" as the registered brand, Luyuan paint industry has always taken water-based paint and related products as the main direction of enterprise development for more than a decade, reaching a high level of industrial development in focus, and has become a domestic professional manufacturer of water-based paint for a very early time A full range of manufacturers. After 17 years of steady and innovative development, the company covers an area of nearly 60000 square meters, the plant area is 32000 square meters, and has more than 140 staff, including 15 technical engineers, 2 doctoral students, and more than 20 staff with bachelor's degree or above

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