What are the junior high school problems with papermaking chemicals?

Many drugs are used in modern papermaking:

Classification of Fine Chemicals Used in Papermaking in China

I. Pulping chemicals

(1) Cooking aids-anthraquinone and green oxygen

(2) Deinking agent for waste paper

1. nonionic: alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, fatty alcohol cyclic ethylene propylene block polymer.

2. Anionic type: sodium alkylbenzene sulfonate, sodium alkyl ether sulfate and fatty acid soap.

3. Various surfactant selective compounds

(3) pulp bleaching agents-chlorine dioxide and hydrogen peroxide.

(4) Pulp bleaching auxiliaries-sulfamic acid and thiourea dioxide.

(5) fluff pulp release agent-quaternary ammonium salt compound.

B, papermaking process chemicals

(1) Retention and drainage AIDS-cationic starch, polyacrylamide, polyethyleneimine (PEI) and anionic starch

And a multi-element retention aid system.

(2) Defoamer-silicone type, polyether type or fatty amide type surfactant.

(3) Preservatives-triazine, isothiazolinone and organic bromine compounds.

(4) Flocculants-sodium polyacrylate, polyacrylamide and their modified products.

(5) Deposition control agent-cationic polyamide, etc.

(6) Fiber dispersant-polyethylene oxide, high molecular weight anionic polyacrylamide, etc.

C, functional chemicals

(1) Sizing agent in size

1. Acid papermaking uses: white rosin size, reinforced rosin size, anionic emulsion rosin size.

2. Near-neutral papermaking: cationic emulsified rosin size

3. Neutral papermaking: Alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), rosin neutral sizing agent and resin neutral sizing agent.

(2) Dry reinforcing agents-cationic starch, polyacrylamide (anionic, cationic, amphoteric), amphoteric starch, multivariate modified starch, etc.

(3) Wet reinforcing agents-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 * * * polymer, acrylic acid-styrene * * *

Polymer, CMC, etc.

(5) Whitening agents-VBL, APB-L, APC.

(6) Softening agents-imidazoline, betaine, etc.

(7) Flame retardants-sulfamate, ammonium polyphosphate, etc.

(8) Waterproofing agents-silicone and acrylate polymers.

(9) Oil repellent-fluorine-containing organic compounds

(10) fillers-talcum powder, light calcium carbonate, superfine heavy calcium carbonate, kaolin, titanium dioxide, etc.

D, coating chemicals used for processing paper

(1) coating adhesive (slurry)-carboxyl styrene-butadiene rubber, styrene-acrylic emulsion, CMC, modified starch, casein, etc.

(2) Pigments Inorganic pigments: kaolin, calcium carbonate (light and ultra-fine grinding), titanium dioxide, etc.

Organic pigments: urea-formaldehyde resin particles, polystyrene-acrylic polymer plastic pigments.

(3) Pigment dispersant-sodium hexametaphosphate, sodium polyacrylate (DC), acrylic acid and acrylamide (DA)

(4) Printing suitability improver-amphoteric polyamide polyurea resin

(5) Lubricant-calcium stearate dispersion (emulsion)

(6) Waterproofing agents-modified melamine formaldehyde resin, organic and inorganic zirconium salts, etc.

(7) Defoamer-polyether, silicone.

(8) Preservatives-triazine, isothiazolinone and organic bromine compounds.

E, water treatment chemicals

(anionic, cationic, amphoteric) polyacrylamide, chitosan compound, polyaluminum chloride, polyaluminum ferric chloride, aluminum sulfate,

Sodium polyacrylate, etc