OIT is a broad-spectrum, non-formaldehyde-releasing dry film mold inhibitor for protection against bacteria, yeast and fungi in waterborne coatings after film formation.BEK-560 will not affect the long-term stability of dry film paints, nor will it cause yellowing, color loss, chalking or cracking of dry film paints. It also prevents the growth of mold and other microorganisms in emulsion paints, waterborne industrial paints, waterborne adhesives, leather textiles, and wood.
OIT is also suitable for water-based emulsions, coatings, adhesives, finishes, leather, polymers, nonwovens, artificial leather, microfiber, canvas, wood and paper, and is a low-toxicity, high-efficiency, broad-spectrum product with strong killing effect on mold and mildew, which can achieve the ideal fungicidal effect. It is water-soluble and compatible with most systems. It meets European and American standards and is free of formaldehyde, carson and TCMTB.
The relationship between surface tension and the wettability of the coating to the substrate
(1) Wetting of the solid surface by the liquid When the liquid is dropped on the solid surface, a contact angle of 0 is formed at the junction of the solid, liquid, and gas phases, as shown in Figure 8-2. In the figure, 7i is the surface tension of the droplet, it tries to reduce its surface area: ys is the surface tension of the solid, it tries to spread the liquid on its surface; YsL is the interfacial tension between the liquid/solid, it tries to reduce the droplet The interface area when in contact with the solid surface, when the three forces reach equilibrium, the relationship between the contact angle and the contact angle can be expressed by the wetting equation:
Wetting and spreading of liquid droplets on solid surface
When the contact angle is 0=0, the liquid droplets are completely spread on the solid surface, that is, the surface tension of the liquid is very close to the surface tension of the solid. The surface tension of the liquid is the critical surface tension of the solid, expressed by Yc, that is, ye=ys-YsL , Then the wetting equation can be written as: Ye=YLc osd
It can be seen from the wetting equation that when the surface tension of the liquid is less than the critical surface tension of the solid, the liquid can completely wet the substrate. For the solid surface, the liquid with low surface tension is easier to wet the solid surface. For example, the critical surface tension of glass is 70mN/m, and most liquids can easily wet it, while the critical surface tension of untreated steel plates, polypropylene, polyethylene, and especially polytetrafluoroethylene is low, so There are many liquids that cannot wet these surfaces.
(2) Spreading of liquid on solid surface The liquid whose surface tension is Y, is coated on the surface and the solid surface can be Ei, and its surface energy is Ea. There is a surface energy difference △E on the surface before and after coating. , Also known as spread coefficient S. Because Er-ys, Ei=Yu+Ysl.
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