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What are the chemicals used in papermaking

2021-09-26

A. Chemicals for pulping
(1) Cooking aids-anthraquinone, green oxygen
(2) Waste paper deinking agent
1. Non-ionic type: alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, fatty alcohol cycloethyl cyclopropyl block copolymer
2. Anionic type: sodium alkylbenzene sulfonate, sodium alkyl ether sulfate, fatty acid soaps
3. Selective compound of multiple surfactants
(3) Pulp bleaching agent-chlorine dioxide, hydrogen peroxide
(4) Pulp bleaching aids-sulfamic acid, thiourea dioxide
(5) Fluff pulp release agent—a compound of quaternary ammonium salt
B. Papermaking process chemicals
(1) Retention and drainage aids-cationic starch, polyacrylamide, polyethyleneimine (PEI), anionic starch and multiple retention aid systems
(2) Defoaming agent-silicone type, polyether type or fatty amide type surfactant
(3) Preservatives-s-triazines, isothiazolinones, organic bromine compounds
(4) Flocculant-sodium polyacrylate, polyacrylamide and its modified products
(5) Sediment control agent-cationic polyamide, etc.
(6) Fiber dispersant-polyethylene oxide, high molecular weight anionic polyacrylamide, etc.
C. Functional chemicals
(1) Internal sizing agent
1. For acid papermaking: white rosin glue, reinforced rosin glue, anionic emulsion rosin glue
2. Near-neutral papermaking: cationic emulsion rosin glue
3. For neutral papermaking: alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), rosin-based neutral sizing agent, resin-based neutral sizing agent
(2) Dry strengthening agent-cationic starch, polyacrylamide (anionic, cationic, amphoteric), amphoteric starch, multiple modified starch, etc.
(3) Wet strengthening agent-melamine formaldehyde resin (MF), urea formaldehyde resin (UF), polyamide epichlorohydrin resin (PPE), etc.
(4) Surface sizing agent—polyvinyl alcohol, oxidized starch, high retention cationic starch, styrene maleic anhydride copolymer, acrylic acid-styrene copolymer, CMC, etc.
(5) Brighteners—VBL, APB-L, APC
(6) Softeners-imidazolines, betaine, etc.
(7) Flame retardants-sulfamate, ammonium polyphosphate, etc.
(8) Waterproofing agent-silicone, acrylate copolymer
(9) Anti-oil agent-fluorine-containing organic compound
(10) Filling (color) material-talcum powder, light calcium carbonate, superfine ground heavy calcium carbonate, kaolin, titanium dioxide, etc.
D. Chemicals for coating and processing paper
(1) Coating adhesive (sizing material)-carboxyl styrene butadiene rubber, styrene-acrylic copolymer emulsion and CMC, modified starch, casein, etc.
(2) Pigments Inorganic pigments: kaolin, calcium carbonate (lightweight, ultra-fine grinding), titanium dioxide, etc.
Organic pigments: urinary formaldehyde resin particles, polystyrene acrylic polymer plastic pigments
(3) Pigment dispersant-sodium hexametaphosphate, sodium polyacrylate (DC), acrylic acid and acrylamide copolymer (DA)
(4) Printability improver-amphoteric polyamide polyurea resin
(5) Lubricant-calcium stearate dispersion (emulsion)
(6) Water repellent-modified melamine formaldehyde resin, organic and inorganic zirconium salts, etc.
(7) Defoamer-polyether, silicone
(8) Preservatives-s-triazines, isothiazolinones, organic bromine compounds
E. Water treatment chemicals

(Anionic, cationic, amphoteric) polyacrylamide, chitosan compounds, polyaluminum chloride, polyaluminum ferric chloride, aluminum sulfate, sodium polyacrylate, etc.

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