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Do water-based/water-soluble/solvent based coatings need to add substrate wetting agents
Normally, the surface tension of water is very high at around 72 dynes. The surface tension of most of our substrates, whether they are metal, plastic, cement, etc., is lower than, or even much lower than, the surface tension of water. Just like when we drop a drop of water onto a substrate, the ...Read more -
What are the causes of paint “sagging” and how to prevent it
It is a phenomenon where the paint film on the inclined or vertical surface of the workpiece becomes locally thicker, wavy, or has a shallow single shape after application. Usually appearing in the vertical plane, we call it a vertical curtain like fluidization, which appears at the edges and cor...Read more -
Why restrict PFAS and accelerate global decarbonization efforts
Because perfluorinated and polyfluoroalkyl substances are extremely stable chemicals, almost completely non degradable, and can accumulate in the environment, animals, and humans, they are also known as eternal chemicals. PFAS can damage the human immune system and is associated with related dise...Read more -
Stable basis of dispersants
The dispersion of pigments is actually divided into three processes: The first step is wetting, which means removing the air on the surface of the pigment to facilitate the anchoring of our dispersant on the surface of the pigment. The second step is actually the process of dispersion. The proces...Read more -
What are the preparation methods of colorants and what are the differences
There are roughly four types of methods for preparing colorants. The first type is co grinding, also known as color mixing grinding. Co grinding is the process of adding different pigments, such as white, black, blue, etc., together and into the grinding slurry. Then, after stirring and dispersin...Read more -
Differences, advantages and disadvantages, and application scenarios between primary and secondary dispersions
We all know that PUD and PUA are secondary dispersions, while many single component lotion are primary dispersions. The primary and secondary dispersions we are discussing here mainly refer to water-based hydroxypropionic acid resins. These primary and secondary dispersions appear milky white in ...Read more -
Can defoamers have both good compatibility and defoaming properties
As a defoamer substance, it must meet the following two conditions. The first is the ability to maintain long-term compatibility and limited system compatibility. The second one is lower than the surface tension of the system. Defoamers and systems are definitely incompatible. If the defoamer has...Read more -
How to determine if the pigment is well dispersed
The first consideration is to measure the fineness, and it is even believed that as long as the fineness meets the requirements, it means that the dispersion is good. Actually, it’s not right. Once the pigment is truly dispersed, there will be significant improvements in the gloss and vivid...Read more -
The difference and application of controlled flocculation and deflocculation dispersants
A controlled flocculation dispersant that uses a special structure to allow one end of the dispersant to bond with the surface of the pigment. On the other end, it will form hydrogen bonds with another dispersant. In this way, the pigment particles are flocculated and brought closer together, but...Read more -
How to solve the reasons for thickening after coating
In the paint industry, post thickening is one of the most headache inducing problems in research and production. It usually refers to the abnormal increase in viscosity of the paint after 24 hours of preparation or within a few weeks of storage, even resulting in tofu residue and clumping, making...Read more -
Water based industrial paint flash rust, reasons, and how to prevent flash rust
The main reason for the rusting of water-based coatings during the drying process of flash rust test strips is that water-based coatings are conductors. Generate current between different regions with positioning differences. Under the combined action of water and oxygen, metal substrates undergo...Read more -
The causes of paint film shrinkage and how to solve the shrinkage problem
Shrinking edge, also known as fat edge or thick edge, frame, etc. After the coating film is formed, the area of contact between the edge of the paint film and the air is larger than the other middle parts. At the edge, it contacts all three sides, with only one side in the middle. So the evaporat...Read more
