Paper sizing agent PAC white powder is high-purity polyaluminum chloride. It consists of a series of different degrees of polymerization of inorganic polymer compounds .The main composition is Al13O4 (OH) 24 (H2O) 127+ highly charged poly-aluminum ions chain.
Despite aluminium sulphate is is widely to for paper sizing , however, in recent years as neutral sizing technology developed, aluminium sulphate showed negative effects obviously, such as equipment corrosion, paper strength declined, anti-aging performance poor and limitation usage of calcium carbonate.
Paper sizing agent PAC white powder is made of pure aluminum hydroxide and high-pure hydrochloric acid, after high temperature and high pressure step, we delete FE content to get high-purity polyaluminum chloride products.By this way, the basicity canbe controlled,the color is white, without affecting the color of white paper.
Compared with the aluminum sulfate, polyaluminum chloride has the following characteristics: 1) a large number of multi-core with a positive charge, shape stability of hydroxy aluminum complexes, can effectively promote flocculation, sizing. 2) white color, low content of iron, can meet the needs of manufacturing high quality paper. 3) poly-aluminum chloride hydrolysis is relatively low , pulp pH value gap decline smaller than the aluminum sulfate. 4) aluminum sulfate is only suitable for acid sizing and polymeric aluminum chloride can glue in acidic and neutral environment, corrosion of the system decreased significantly, white water treatment easier. 5) calcium carbonate can be used. not only reduces production cost and improve the whiteness of the paper and folding, while overcoming the synthetic plastic material (such as AKD) inevitable shortcomings (such as skidding, sizing is difficult to control, and so on). 6) pulp retention and drainage AIDS in greatly increased. 7) paper performance addition to the breaking length, other indicators improved.
UsageMake solid powder to 10% solution ,then add 1.5-3% liquid to pulp and mix. Compared with aluminium sulphate , the dosage is only one third of it. For dry paper, the dosage is 2-3%.
