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2. Preparation of paint Because the polyester coating is a reactive coating, the curing agent is mixed with the coating liquid, and after mixing, the chemical reaction is started. Therefore, attention should be paid when using the coating. Uniform, exhausted paint must not be poured back into the original packaging. After the paint has been dispensed overnight, the viscosity will rise due to chemical reactions until it is gelled and cannot be used.
3, the use of thinners The use of thinners should be based on different coating methods are different, the specific coating method can refer to the instructions, in the case of spraying, thinner can be suitable for adjustment, but pay attention to viscosity, can not dilute.
4. After the interval between paintings is finished, before painting the next coat of paint, be sure to confirm whether it has reached the specified interval between paintings. Otherwise, paint cannot be applied.
5, abnormal coating In the wet weather coating will appear pinholes, small bubbles and Other abnormalities, affect the corrosion resistance of the coating, should avoid construction in wet weather if the above situation occurs, the paint film carefully polished and recoated.
6. The complete curing of the paint film is not the final formation of the paint film after the paint film is dry and dry. It must be placed at room temperature for 7 days. After the paint film is fully cured, it can be put into use.
7. Preparation before painting (1) Before coating, it is necessary to check whether the type, model, and specification of all the paints meet the requirements for construction technical conditions.
(2) Before coating, understand the basic composition, performance, and construction method of the coating, and select and determine the coating tool according to the construction requirements of the coating.
(3) The paint must be stirred until it is completely uniform. If paint or granules are found, it should be filtered using a 80-120 mesh screen.
(4) If the mixing ratio is wrong, the drying performance and adhesion performance will be affected, and the wrinkling will be serious and the film will be whitishly delaminated. Cross-linked curing paint, after the two components of A and B are mixed, it needs to stand still for 15-20 minutes before it can be used. Therefore, it should be calculated according to the coating area and then used to prepare the coating.
(5) The amount of paint and the actual amount of paint used for coating vary depending on the thickness of the paint film, the loss of the paint, the method of coating, and the rough condition of the surface to be coated. When estimating the actual consumption of paint, it should generally be calculated in addition to the theoretical amount of use, depending on the amount of material used.
(6) Safety matters
1. In order to prevent the paint from splashing on the skin or in the eyes, work clothes, gloves, and protective glasses must be worn during construction. If the paint splashes on the skin, wash it with soap and water. It is best not to use solvents. If paint splashes into your eyes, flush it with clean water for at least 10 minutes. Then go to the doctor immediately.
2. If operators feel uncomfortable with dizziness, headache, nausea, vomiting, etc., they should immediately go to the place where there is fresh air, until the ventilation at the work place is improved before painting can continue. If you are fainted by inhalation of excessive gas or paint mist, you should immediately move it to a fresh air place to gradually recover, but do not perform forced exercise.
Matters needing attention when painting construction
1. In addition to the climatic conditions, the surface of the substrate and the front lacquer should be clean and dry, but also pay attention to the substrate and the air humidity so as to prevent the humidity of the substrate from affecting the adhesion of the paint. Generally speaking, the relative situation is 85%. The construction temperature of the substrate and the ambient temperature are basically the same. Therefore, if the relative humidity is lower than 5%, the construction is performed. If the ambient temperature is lower than 5oC, the curing reaction tends to stop, so the construction cannot be performed. When the humidity is higher than 85%, pinholes and bubbles are likely to occur, and the construction humidity should be less than 85%. When the surface is affected by rain, painting cannot be performed. Avoid whitening of the paint film. When working under harsh conditions of 30oC or more, the solvent evaporates quickly. During spraying, the solvent in the paint evaporates between the spray gun and the surface of the material to form a dry spray. In order to avoid dry spraying, the gun should be controlled as much as possible from the gun distance, while spraying as far as possible, if there is still dry spray after taking this measure, an appropriate amount of thinner can be added for dilution to solve.