1, broad-spectrum, kill a variety of fungi and yeast. Environmentally friendly, in line with EU requirements.
2, low toxicity, easy to operate, applicable to a wide range of pH, 5 ~ 9 can be used.
3, evenly dispersed, heat stable, non-combustible, easy to transport, stable under strong UV and acid rain conditions.
4, Passed ASTM E-1428-99 PINK STAIN and ASTM G-21-96 MIXED FUNGI test.
The miscibility of this type of leveling agent with the coating is an important property that affects the leveling of the coating film and other surface conditions. A leveling agent with too good compatibility will not form a monomolecular layer on the surface to provide a leveling effect. A leveling agent with poor compatibility will cause the coating film to fog, reduce gloss or lose gloss and other unfavorable surface phenomena carnauba wax edible. Acrylate homopolymers have poor compatibility with film-forming polymers such as epoxy resins, polyesters or polyurethanes, so acrylate copolymers are often used, and different acrylate monomers are used to participate in the copolymerization to adjust their miscibility with coatings. , And its glass transition temperature can be adjusted to lower than -20°C to have good fluidity at room temperature.
When acrylate homopolymer or copolymer is used as a leveling agent, its molecular weight and molecular weight distribution have a great influence on the surface state of the coating film. The molecular weight has an applicable range, usually the number average relative molecular weight is between 2500 and 30,000. , And the molecular weight distribution is as narrow as possible, which is beneficial to migrate to the surface of the coating film to form a monomolecular layer, and uniformly control the flow and leveling of the surface. If the molecular weight is too low, the leveling agent will completely float on the surface of the coating film and cause changes in the physical properties of the coating film; on the contrary, if the molecular weight is too high, the leveling property will decrease or even disappear.
The use of polyacrylate leveling agent is safer than modified silicone leveling agent. Even if it is added too much, it will not affect the recoatability or interlayer adhesion, but it may cause film shrinkage or fogging. , Loss of gloss and other defects. From the relationship between polyacrylate leveling agent dosage and film shrinkage, orange peel and surface tension reflected in Figure 8-10~Figure 8-12, it can be seen that as the amount of leveling agent increases, the shrinkage cavity decreases and the vividness Increase, the surface tension decreases, but when the dosage continues to increase, these variables tend to be constant. In other words, excessive use of leveling agents does not help to further improve the leveling, on the contrary, it will bring side effects. In addition, the amount of leveling agent is also related to the type of film-forming polymer. For different resins, to achieve the same leveling effect, the amount is different, and the maximum amount usually does not exceed 2% of the total amount of coating. Therefore, when using this type of leveling agent, care should be taken to determine the most compatible variety and the best dosage through the test meter.
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