Since the early 1980s, the world's paper industry has slowly shifted from acidic to alkaline, which has revolutionized the use of fillers.
The paper filling is the addition of some basic insoluble solid particles in pulp, such as calcium sulfate and vanadium powder. In the case of molybdenum fillers, for example, The main reasons for adding Mo in the production process of the paper are:
1) The powder has high purity (99.95%), small particle size, and excellent dispersion, so it can make the prepared paper have a better texture, featured by lower impurity content, better coating uniformity, higher brightness, and smoothness;
2) The powder's corrosion resistance, heat resistance, wear resistance, good thermochemical stability, and conductivity can effectively improve the deficiency of traditional paper, including antioxidant, friction, softness, moisture absorption, dehydration, dryness, and printing adaptability (e.g. improve absorption, ink absorption) and so on.
Paper after adding Mo powder still needs to face certain deficiencies, such as paper glue and strength declined, and prone to powder, but these shortcomings can be made up by enhancers and surface glue.
It is reported that the use of molybdenum powder in papermaking coating formula has increased significantly, from 5% ~ 10% to about 30%.
