What kinds of fillers and frequency materials are commonly used in wood coating, and what are their characteristics?
Commonly used fillers and pigments for wood coating are:
(1) old fan
The main ingredient is calcium carbonate, white, with very low hiding power and small tinting power. It is often used in primers, top coats and putties. Used as filler.
(2) Gypsum powder
The main ingredient is calcium sulfate, which is white and has high water absorption. It is only used in small amounts in putty, putty, and primer.
(3) Talc powder
The main ingredient is magnesium magnetite, which is slightly green in block form and white after being ground into powder, with low hiding power and small tinting power. Adding it to the paint can reduce sagging and reduce the brightness of the paint film.
(4) Iron oxide red
The main component is ferric oxide, which is an economical red pigment with good light fastness. Its advantages are strong tinting power and hiding power, stable chemical properties, heat and alkali resistance. The disadvantage is that the color is boring and not bright enough.
(5) Iron oxide black
The main component is ferric oxide. It is a black pigment with strong hiding power and tinting power. The disadvantage is that it will be oxidized in the atmosphere and turn iron red.
(6) Iron oxide brown
Also known as haba powder, it is a mixture of iron oxide red and iron oxide black, which is brown in color.
(7) Iron oxide yellow
It is ferric oxide containing crystal water. Good tinting power and hiding power, very good light fastness, stable chemical properties in the atmosphere. The disadvantage is that it is not acid-resistant, and it will turn red when it encounters acid.
