Papermaking chemicals refer to the general term for various chemical agents and additives used in the papermaking process. Their purpose is to improve paper quality and production efficiency, improve operating conditions, reduce manufacturing costs, increase economic benefits and develop new paper types. They are essential key technical products in the papermaking industry.
There are many kinds of papermaking chemicals. According to their different purposes and functions, they can be divided into two categories: functional chemicals and process chemicals:
Process chemicals
1. Retention and drainage aids: cationic starch, polyacrylamide, polyethyleneimine, anionic starch and multi-retention systems
2. Defoamers: silicones, polyethers or fatty alcohols
3. Preservatives: s-triazine, isothiazolinone, organic bromine compounds, etc.
4. Flocculants: polyaluminium chloride, sodium polyacrylate, polyacrylamide and its modified products
5. Sediment control agents: cationic polyamide, etc.
6. Fiber dispersants: polyethylene oxide, high molecular weight anionic polyacrylamide, etc.
Functional chemicals
1. In-stock sizing agents: rosin sizing agents, alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), resin-type neutral sizing agents
2. Drying strength enhancers: cationic starch, polyacrylamide (anionic, cationic, amphoteric), amphoteric starch, multi-modified starch, guar gum, etc.
3. Wetting strength enhancers: melamine formaldehyde resin (MF), urea-formaldehyde resin (UF), polyamide epichlorohydrin resin (PPE), polyethyleneimine, dialdehyde starch, etc.
4. Surface sizing agents: polyvinyl alcohol, oxidized starch, cationic starch, styrene maleic anhydride copolymer, acrylic acid-styrene copolymer, CMC, etc.
5. Brighteners: VBL, APB-L, APC
6. Softeners: surfactants, high carbon alcohols, polymer wax, silicone polymer, etc.
7. Flame retardants: aminosulfonates, ammonium polyphosphate, etc.
8. Waterproofing agents: silicone, fluorine-containing organic compounds, etc.
9. Fillers: talc, light calcium carbonate, heavy calcium carbonate, kaolin, titanium dioxide, etc.
