Spraying method is one of the most important methods in the construction of waterborne resin coating. It is easy to coat the surface of the object by spraying method. It can obtain thin and uniform coating film. For the different geometrical shapes, there are holes, cracks and ruggedness. Can be distributed evenly; for spraying large surface, this method is more rapid and effective brushing. But with the spray method for construction also need to master some operational skills:

First, with a clean water to adjust the paint to the appropriate viscosity of the coating to test -4 viscometer measurement, the appropriate viscosity is generally 20 seconds to 30 seconds.

The gun can be used up and down, left and right movement, preferably 10 to 12 m / min speed uniform operation, the nozzle should be flat in the surface spray, try to reduce the oblique spray. When sprayed at both ends of the surface, the button to pull the gun to quickly loose, because the ends of the object, often to accept more than two times the spray, is the most likely to cause sagging place.

Fifth, when spraying, the next one to suppress on a 1/3 or 1/4, so that it will not leak phenomenon. Spray fast-drying paint, the need to spray the order in a row, filling effect is usually not ideal.

Sixth, in the outdoor open place to spray, pay attention to the wind (the wind is not suitable for work), the operator should stand in the direction of the wind, to prevent the mist from being blown to the sprayed film caused by ugly granular surface.

Seventh, spray the order is: first difficult after the first, after the first outside. The first high after the low, the first small area after a large area, so that will not cause the spray after the spray fog spray has been sprayed on the film, the damage has been sprayed good film.

Although water-based coatings are currently being used more and more widely, there are still some problems to be optimized and addressed, such as long film-forming time, moderate sensitivity to ambient temperature, low solids content relative to conventional solvent-based coatings, Water dispersion coating for a long time storage difficulties.

As the surface tension of sleep is higher, the construction of water-based paint is different from the solvent-based coating, the substrate surface cleanliness, construction environment, high temperature and humidity requirements, through the formulation of technical improvements and the adjustment of the construction process to solve The

Water-based paint also need to solve the contradiction between the hydrophilicity and water resistance of the coating. Water-based coating film containing a large number of hydrophilic groups and hydrophilic substances, if not converted or treated, will inevitably affect the water resistance of the coating, the water resistance if the rain-based coating, which is water-based paint in the use of Subject to the constraints of the main factors.

Most waterborne resins are present in the form of water emulsified or water dispersible, and the gloss and fullness of the film after film formation are not as good as solvent-based coatings, which makes most of the aqueous coatings unusable in applications requiring high gloss coatings.

In addition, some water-soluble paints and adjuvants are still required in some water-based paints. Some solvents or cosolvents are more toxic and more harmful to the body than the solvents used in the solvent-based coatings. Big. Therefore, environmental protection, health and safety is still the future of water-based paint research and development, production and development process should pay attention to the problem.

1, waterproof:
Waterproof performance of the most important performance is to use a semi-wet cloth wipe paint, poor water resistance paint will fade. If the paint is applied to the kitchen, bathroom and other places where the water vapor, water resistance can prevent the wall paint damp powder.

2, alkali:
Paint with alkali resistance is very important, because the concrete wall of the concrete is very high, in the above painted wall paint will appear after the anti-alkali, so that wall paint flowers. Although the wall will be putty putty treatment, but now with the waterproof putty is also high alkaline PH value can reach more than 10, so anti-alkali function is very necessary.

3, mildew:
Although the north is relatively dry, but in certain circumstances there will be wall moldy phenomenon. For example, the phenomenon of condensation of the wall, the humidity reached 70% or more, the temperature reached 25 ℃ when there will be moldy phenomenon. But the Chinese new paint network need to remind you that in this wall with the use of mildew wall paint can reduce the probability of mold, can not be completely eliminated.

4, crack resistance:
Mainly against the paint due to shrinkage caused by chapped, this should be the basic function of qualified products. As for the crack resistance of the paint can cover the wall of small cracks, the industry pointed out that this function is mainly reflected in the old house on the second decoration, in the case of not completely putty layer can be eradicated in the case of very fine chapped cover Live, but can play a very limited role. In the new house decoration, the wall completely reprocessing the case, this performance cracking paint on the little effect.

From the composition and environmental protection, said:
The main varieties of water-based architectural coatings are latex paints. Latex paint is mainly composed of water, lotion, pigments and fillers and four kinds of additives; and solvent-based paint composition is resin, pigments and fillers, solvents and various additives composed of four parts. It can be seen: the dispersion of water-based paint medium is water, paint construction, from the coating of volatile water and a small amount of additives, with environmental protection, safety and other properties; and solvent-based paint dispersion medium is organic solvents (generally referred to VOC), from the coating of volatile organic solvents are toxic and hazardous substances, not only harm the human body, but also the natural environment pollution.

From the physical and chemical properties of the coating speaking:
Some of the physical and chemical properties of waterborne coatings are less than solvent-based coatings, such as chemical resistance, weatherability, stain resistance and the like. So the use of water-based paint without solvent-based paint long. But the water-based paint also has some high-grade products: such as water-based silicone C coatings, fluorocarbon coatings, the service life can reach l0 a l5 years.

From the construction environment point of view:
In the construction environment, the construction of water-based paint generally requires more than 5 ℃ construction, solvent-based paint can also be constructed in the O ℃, so the northern region, close to the winter can use solvent-based paint for construction.

From the requirements of the grass-roots level:
Water-based paint construction of the grass-roots moisture content should be less than l0%, solvent-based coating construction base water content should be less than 8%. Water-based paint permeability is better, the grass-roots water vapor can spread outside; and solvent-based coating film dense, if the grass-roots moisture content, water vapor can not be volatile from the film, easy to blister.

As can be seen from the above, water-based paint than the solvent-based coatings in environmental protection has more advantages, but the physical and construction environment, the water-based paint is less than solvent-based paint. On the current domestic paint market trends, water-based paint more long-term development advantages, more in line with sustainable development.