One. How to accelerate the drying of industrial paints
1、Adding a certain amount of hardener to the paint will accelerate the drying process.
2. When painting in a dry environment, the drying speed will be faster, and autumn is also a good season for painting.
3. After applying paint, ensure adequate ventilation. You can use a fan to increase air circulation, which will help to speed up the drying process.
4、When painting, avoid applying too much paint at once. Applying in multiple coats can also speed up the drying process.
Two. What can be used to speed up the drying of paint?
There are six main methods for paint drying and hardening: air oxidation, solvent evaporation, polymerization, radiation (molecular fusion), melting, and infrared catalytic thermal reaction.
1、Air oxidation curing
Air oxidation curing: This refers to the process of using oxygen from the air to cause the coating to dry and form a film. The oxygen in the air reacts with the coating to form a dry coating film. Highly viscous, dry oils undergo this cross-linking reaction, but the reaction rate is very slow, and it may take several weeks to fully cure.
These coatings include oil-based paints and ester-based paints, among others. Key factors affecting film formation include temperature, ventilation, humidity, and catalysts, etc.
2、Curing through solvent evaporation
Solvent Evaporation and Curing: This process involves the evaporation of solvents through the coating surface, leaving behind the solid components of the coating and adhering them to the substrate surface, resulting in a dry solid coating film.
Types of coatings that solidify through solvent evaporation include: nitro paints, vinyl chloride paints, chlorinated rubber paints, acrylic paints (excluding those with active functional groups), and asphalt paints, etc. Factors controlling film formation include: temperature, ventilation, and humidity, etc.
3、Polymerization reaction curing
Heat-cured or chemically cured: These coatings cure through a chemical polymerization reaction upon heating or in the presence of a catalyst (including a co-catalyst). The various film-forming components within the coating merge and cross-link to form a three-dimensional network structure. After curing, these coatings are no longer soluble in solvents or softened by heat, and their physical and chemical properties are superior to those of solvent-based coatings.
Examples of such coatings include amine alcohol acid coatings, amine acrylic coatings, epoxy resin coatings, two-component polyurethane coatings, and fluorocarbon resin coatings. Factors affecting film formation include: catalyst (hardener), temperature, humidity, etc.
4、Radiation curing
Radiation-cured coatings: This refers to two types: ultraviolet (UV) curing and electron beam curing. The most commonly used radiation-cured coating is UV-cured coating. The coating material, upon exposure to ultraviolet light (wavelengths between 300-400nm), generates free radicals, which initiate polymerization and film formation.
Examples include: acrylate UV-curable coatings, polyester UV-curable coatings, and acrylate/epoxy UV-curable coatings. These coatings can be used on wood products, plastic products, rubber products, and metal products. Coating formation factors: UV light, electron beams, etc.
5、Fusion Curing
- Fused Solidification: Generally refers to coating products in the form of solid powder. Powder coatings melt upon heating, flow onto the coated surface, and then solidify into a film upon cooling.
These products can be applied using two methods: the first involves heating the coated surface to a specified temperature, followed by spraying or immersing the solid powder coating onto the surface, and then curing it to form a solid film according to the required specifications. The second method involves applying the solid powder coating to the surface using electrostatic spraying at ambient temperature, followed by baking at a specified temperature to cure and form the film.
Epoxy powder coatings, polyester powder coatings, and road fusion marking coatings fall into this category. Factors affecting film formation: temperature, humidity, etc.
6、Infrared catalytic thermal curing reaction
Infrared catalytic thermal curing: A method that utilizes the coating's ability to absorb infrared energy and convert it into heat to cure the coating film. The primary advantage of infrared curing is its ability to prevent the formation of orange peel and pinhole defects on the coating surface, as well as enhance the coating's gloss. The curing process proceeds from the inside out: during the curing of the inner layer, the outer layer remains in a liquid state. As the outer layer is fully cured, the solvent in the coating film has evaporated, preventing the formation of orange peel and pinholes, and enhancing the coating's gloss.
Three. important considerations for using industrial paints
1. Ensure adequate ventilation, and maintain a fire-free construction site. Welding is prohibited. Smoking is strictly forbidden.
2. Avoid contact with skin and eyes. When using, wear protective gear such as safety glasses, masks, and gloves.
3. If accidentally contacted with skin, wash thoroughly with neutral cleaning agent and warm water.
4、After opening, ensure proper sealing to prevent water contamination if not used completely.
5. Do not perform construction in rainy or windy weather. If the wall surface has been wet, it must be allowed to dry before construction.