Paint thinner is a kind of thinner that is used to reduce the viscosity of paint. A liquid substance with good miscibility with paint film-forming substances added to improve its construction performance. Most of these diluents are actually organic solvents. The English name of thinner is "Thinner", so some people also call it "Thinner water", which is based on its English pronunciation. But thinner is not the same as "banana water" or "rosin water" because "banana water" usually refers to the thinner of nitrocellulose paint, while "rosin water" usually refers to the thinner of alkyd paint.
Diluent is divided into active diluent and inactive diluent. Reactive diluents participate in the chemical reaction in the paint film-forming process (only used in some special paints). Most non-reactive diluents evaporate during the paint film-forming process. Therefore, diluents are also an important component of VOC (volatile organic compounds), and are therefore also targets for air pollution prevention and emission reduction.
The role of thinner In addition to reducing the viscosity of paint to improve construction performance, it is sometimes used to remove grease from the surface to be painted and clean painting equipment. Therefore, consumption in this area should also be considered when estimating the purchase amount.
The amount of thinner that needs to be added to the paint has a great relationship with the construction method and the construction equipment used, because different construction methods and equipment have different viscosity requirements for the paint. And construction There are many types of methods and equipment and different principles, so it is difficult to give a very accurate dosage.
Generally, paint manufacturers set the factory viscosity of anti-corrosion paint so that it can be applied by high-pressure airless spraying without adding diluent (but applicable The nozzle and total output fluid pressure vary depending on the type of paint). However, the actual nozzles and total output fluid pressure used at the construction site may not necessarily meet the requirements. Therefore, it is sometimes necessary to add diluent to adjust the construction performance to meet the actual construction process requirements.
Generally, The usage amount (weight ratio) of thinner under different construction methods is as follows:
—Roller or brush application: 5-10% of paint volume. If the required coating thickness is very thin, add more thinner accordingly.
— High-pressure airless spraying: 5-10% of the paint volume. The lower the total output fluid pressure used, the more diluent required.
— Air-mixed spraying: 10-20% of the paint volume.
—Air spraying: 20-50% of the paint volume. Air spray equipment is the most diverse and requires different amounts of diluent. Generally speaking, siphon-fed spray guns require a low viscosity paint, which requires the addition of more diluent. Pressure-fed air spray equipment, on the other hand, can spray thicker paint and therefore requires less thinner.
In addition, by adjusting the amount of thinner , and can also prevent and cure some paint diseases during the painting process. For example:
—Poor atomization: Increase the amount of diluent added
—sagging : Reduce the amount of diluent added
- High-pressure airless spraying: 5-10% of the paint volume. The smaller the total output fluid pressure used, the more diluent is required.
—Mixed air spraying: 10-20% of the paint volume.
—Air spraying: 20-50% of the paint volume. Air spray equipment is the most diverse and requires different amounts of diluent. Generally speaking, siphon-fed spray guns require a low viscosity paint, which requires the addition of more diluent. Pressure-fed air spray equipment, on the other hand, can spray thicker paint and therefore requires less thinner.
In addition, by adjusting the amount of thinner , and can also prevent and cure some paint diseases during the painting process. Examples are as follows:
—Poor atomization: Increase the amount of diluent added
—sagging : Reduce the amount of diluent added
—干 Spray: Increase the amount of thinner added
etc. wait.
Considering that the diluent will eventually evaporate, it is guaranteed to When the paint film is well formed, its use should be minimized to save costs and reduce environmental pollution.
etc.
Considering that the diluent will eventually evaporate, it is guaranteed to When the paint film is well formed, its use should be minimized to save costs and reduce environmental pollution.
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