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Paper chemicals refer to the general term for various chemical agents and additives used in the papermaking process. It covers a wide range of contents, including four categories: pulping chemicals (such as cooking aids, deinking agents, etc.), papermaking chemicals (such as sizing agents, wet strength agents, etc.), paper processing chemicals (such as fungicides, defoamers, coating agents), and pollution control chemicals. Its purpose is to improve the quality and production efficiency of paper, improve operating conditions, reduce manufacturing costs, increase economic benefits, and develop new paper varieties.

Magnetic powder, a hard magnetic single domain particle. It is made into magnetic slurry with adhesives, solvents, etc., and coated on the surface of plastic or metal substrate (support body) to make magnetic recording materials such as magnetic tapes, magnetic disks, and magnetic cards. Magnetic powder is the core component of magnetic coatings and the main factor determining the magnetic properties of magnetic recording media. Magnetic powder has a significant impact on the properties of magnetic recording materials. Therefore, there are certain requirements for magnetic particles: ① specific saturation magnetization σ S and coercivity Hc should be larger; ② The particles are finely needle shaped and uniform; ③ High dispersibility and filling ability in magnetic slurry; ④ Magnetically stable. It is difficult for magnetic powder to meet all the above requirements simultaneously. Commonly used magnetic particles include oxide magnetic particles and metal magnetic particles.

Iron oxide pigment is a type of pigment with good dispersibility, excellent light resistance, and weather resistance. Iron oxide pigments mainly refer to four types of coloring pigments, namely iron oxide red, iron yellow, iron black, and iron brown, based on iron oxides. Among them, iron oxide red is the main pigment (accounting for about 50% of iron oxide pigments), and mica iron oxide used as anti rust pigments and magnetic iron oxide used as magnetic recording materials also belong to the category of iron oxide pigments. Iron oxide is the second largest inorganic pigment after titanium dioxide and also the largest colored inorganic pigment. More than 70% of all consumed iron oxide pigments are prepared by chemical synthesis methods, known as synthetic iron oxide. Synthetic iron oxide is widely used in fields such as building materials, coatings, plastics, electronics, tobacco, pharmaceuticals, rubber, ceramics, inks, magnetic materials, papermaking, etc. due to its high synthesis purity, uniform particle size, wide chromatography, multiple colors, low cost, non-toxic properties, excellent coloring and application performance, and UV absorption performance.