The role of thinners in epoxy resin coatings

” >Thinner is a liquid substance with good miscibility with the resin that is added to reduce the viscosity of the resin and improve its process performance. There are reactive diluents and inactive diluents respectively. Commonly used inactive diluents in epoxy resin coatings include acetone, methyl ethyl ketone, cyclohexanone, benzene, toluene, xylene, n-butanol, styrene, etc.

” >Epoxy coatings have different compositions and use different diluents. Even the same coating has different diluent compositions due to different seasonal climates, such as in summer , the paint thinner will be adjusted to be slower drying, while in winter, the paint thinner will be adjusted to be slightly faster drying. Therefore, summer thinner products should not be used in winter, otherwise, they will cause paint film problems such as bottom biting due to slow drying.

” >Thinner of poor quality not only seriously affects the health of construction workers, but also easily causes the following paint film pathologies: span>

” >1. Poor covering power: film thickness is too thin , the color of the underlying surface can be seen through the paint film.

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” >2. Loss of gloss: The paint film has full luster before drying, but lacks gloss after drying or the gloss of the paint film gradually disappears in the future.

” >3. Orange peel: The surface of the paint film is uneven, similar to the appearance of orange peel or grapefruit peel.

” >4. Clouding/spotting (small spots of silver paint): The color of the silver paint changes, forming patches of dark or light color spots, often along the spray paint Directions form stripes of different colors.

” >5. Pinholes (potholes): Due to the rapid evaporation of thinner after painting, the paint liquid has no time to replenish, and Pinhole-like holes or leather-like pores are produced.

6. Prickly heat (solvent bubbles): due to the evaporation of thinner Soon, water vapor penetrates into the paint film, causing small bubbles and bubble marks in the topcoat.

” >7. Blurry/fogging: The surface of the paint film presents a milky white haze.

” >8. Dripping, drooping, and weeping: During the drying process of paint, excess paint on the vertical surface forms sagging from top to bottom or the lower edge of the paint film. The phenomenon of thickening.

” >So, choose the right matchingdilution The agent can not only make the paint film have a good appearance, but also because its evaporation speed matches the paint, it can ensure the appearance of the paint film after painting, while avoiding some disadvantages caused by construction.