CN118029193A - Sizing agent and application thereof in preparation of anti-sticking oil-resistant baking paper - Google Patents
Sizing agent and application thereof in preparation of anti-sticking oil-resistant baking paper Download PDFInfo
- Publication number
- CN118029193A CN118029193A CN202410232792.9A CN202410232792A CN118029193A CN 118029193 A CN118029193 A CN 118029193A CN 202410232792 A CN202410232792 A CN 202410232792A CN 118029193 A CN118029193 A CN 118029193A
- Authority
- CN
- China
- Prior art keywords
- sizing agent
- parts
- agent
- paper
- sizing
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- Pending
Links
- 238000004513 sizing Methods 0.000 title claims abstract description 128
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 108
- 239000011088 parchment paper Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000003921 oil Substances 0.000 claims abstract description 26
- 229920002545 silicone oil Polymers 0.000 claims abstract description 26
- 238000000576 coating method Methods 0.000 claims abstract description 25
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 18
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims abstract description 17
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- 239000000839 emulsion Substances 0.000 claims abstract description 15
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 14
- 238000011049 filling Methods 0.000 claims abstract description 14
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims abstract description 14
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims abstract description 14
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 11
- 239000000123 paper Substances 0.000 claims description 51
- 239000000243 solution Substances 0.000 claims description 20
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 17
- 229920001131 Pulp (paper) Polymers 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 14
- 229920002554 vinyl polymer Polymers 0.000 claims description 13
- 238000003490 calendering Methods 0.000 claims description 9
- 230000014759 maintenance of location Effects 0.000 claims description 9
- 229920002401 polyacrylamide Polymers 0.000 claims description 9
- 239000004115 Sodium Silicate Substances 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 8
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 8
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 8
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 7
- 239000000378 calcium silicate Substances 0.000 claims description 6
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 6
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 6
- 239000011241 protective layer Substances 0.000 claims description 6
- 239000012744 reinforcing agent Substances 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- HIHIPCDUFKZOSL-UHFFFAOYSA-N ethenyl(methyl)silicon Chemical compound C[Si]C=C HIHIPCDUFKZOSL-UHFFFAOYSA-N 0.000 claims description 5
- 229920002050 silicone resin Polymers 0.000 claims description 5
- 229920002907 Guar gum Polymers 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000004111 Potassium silicate Substances 0.000 claims description 4
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 239000000665 guar gum Substances 0.000 claims description 4
- 235000010417 guar gum Nutrition 0.000 claims description 4
- 229960002154 guar gum Drugs 0.000 claims description 4
- 239000011121 hardwood Substances 0.000 claims description 4
- 239000000391 magnesium silicate Substances 0.000 claims description 4
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 4
- 235000019792 magnesium silicate Nutrition 0.000 claims description 4
- ZADYMNAVLSWLEQ-UHFFFAOYSA-N magnesium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[Mg+2].[Si+4] ZADYMNAVLSWLEQ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 4
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- 239000011122 softwood Substances 0.000 claims description 4
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000004952 Polyamide Substances 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 claims description 3
- 239000011135 tin Substances 0.000 claims description 3
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical group CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229920000881 Modified starch Polymers 0.000 claims description 2
- 239000004368 Modified starch Substances 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- 229920002472 Starch Polymers 0.000 claims description 2
- 239000000440 bentonite Substances 0.000 claims description 2
- 229910000278 bentonite Inorganic materials 0.000 claims description 2
- 235000012216 bentonite Nutrition 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 2
- 125000002091 cationic group Chemical group 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000005470 impregnation Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000011133 lead Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 239000011859 microparticle Substances 0.000 claims description 2
- 235000019426 modified starch Nutrition 0.000 claims description 2
- 239000012266 salt solution Substances 0.000 claims description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 239000008107 starch Substances 0.000 claims description 2
- 235000019698 starch Nutrition 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 17
- 238000000034 method Methods 0.000 description 12
- 235000013305 food Nutrition 0.000 description 10
- 238000005507 spraying Methods 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 239000007787 solid Substances 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- 238000010907 mechanical stirring Methods 0.000 description 4
- 238000004537 pulping Methods 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 241000287828 Gallus gallus Species 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000001164 aluminium sulphate Substances 0.000 description 1
- 235000011128 aluminium sulphate Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 235000021185 dessert Nutrition 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000004434 industrial solvent Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
- D21H17/26—Ethers thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/59—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/62—Rosin; Derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/001—Release paper
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
Abstract
The invention provides a sizing agent and application thereof in preparing anti-sticking oil-resistant baking paper, wherein the sizing agent consists of a surface sizing agent and/or an internal sizing agent, and the surface sizing agent comprises the following components in parts by weight: 100 parts of silicone oil emulsion, 1-10 parts of sodium carboxymethyl cellulose, 1.5-5 parts of cross-linking agent, 5-10 parts of catalyst, 30-70 parts of filling auxiliary agent and 250-400 parts of water; the internal sizing agent comprises the following components in parts by weight: 1 part of rosin size and 4-8 parts of aluminum sulfate. The sizing agent is beneficial to improving the anti-sticking and oil-resistant properties of the baking paper, is applied to the preparation of the baking paper, can simplify the coating process, improves the production efficiency and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a sizing agent and application thereof in preparing anti-sticking oil-resistant baking paper.
Background
The baking paper is also called silicone oil paper, is prepared by coating silicone oil on the surface of baking base paper, is food paper, can be widely used for dessert baking, food microwave, food packaging and the like, is mainly used for isolating baking trays from food (such as bread or cakes) during baking or baking at present, can keep the taste of the food, is clean and convenient, can replace part of baking tin paper (also called aluminum foil paper), and is low in cost and environment-friendly. The paper is used abroad earlier, and along with the improvement of the living standard of substances in recent years in China, the self-health care consciousness and the environmental protection consciousness of people are continuously enhanced, and the demand of the paper is increased year by year.
The organosilicon release agent used for baking paper sold at present is mainly solvent type and solvent-free type. The solvent type organic silicon release agent usually contains industrial solvent toluene, is likely to be inconsistent with food national safety standard GB9685-2016 (food safety national standard food contact materials and additive use standards for products), has higher potential safety hazard, is not suitable for in-machine production of baking paper, and needs secondary processing after taking off the machine. Although the solid content of the solvent-free release agent is 100%, expensive coating equipment is generally required to accurately control the coating amount in the production process, at present, some baking paper manufacturers use food-grade solvents to dilute solvent-free release agent products, the effect of controlling the coating amount is achieved under the condition of using economical coating equipment, but the potential safety hazard of inflammability and explosiveness still exists in the whole production process of the baking paper, and meanwhile, the method is not suitable for in-machine production of the baking paper.
Patent 201610009208.9 discloses an off-machine production and processing technology of silicone oil paper, wherein the coating is prepared by mixing emulsion silicone oil, a catalyst and a crosslinking agent in proportion, and is rolled after coating, drying, rewetting, secondary drying, calendaring and slitting. However, the oil resistance is not mentioned, and the coating process is an off-machine coating process, and the secondary processing brings about a great increase in production efficiency and production cost. If the process of the patent is directly changed into an in-machine coating mode, the base paper is open, loose and porous because the base paper is not subjected to surface sizing and calendaring treatment; and the base paper is not completely cooked, so that the water absorption is higher. The release agent permeates more into the base paper, resulting in lower anti-sticking and oil resistance. The solution is to increase the coating amount to improve the anti-sticking and oil-resistant properties of the baked paper, but the cost is increased obviously, so the patent method is not suitable for being changed into an in-machine coating mode, and has no competitive advantage compared with an out-machine coating mode.
Patent 201811112182.6 discloses a food-grade baking paper and a method for making the same, which uses an in-machine coating method to apply Tu Jiaoye to a second positive press section, a first negative press section and a surface sizing section, respectively. This treatment does improve the oil resistance to some extent, but has two drawbacks: firstly, when sizing is carried out at a squeezing position, the surface retention rate of glue solution is low, so that the efficiency in actual production is low, the cost is high, and the popularization and the application are difficult; secondly, the process of applying for many times is complex, which is equivalent to improving the oil resistance of the baking paper through losing the efficiency and the cost, but is rather not lost.
From the above analysis, the existing technical scheme for obtaining the oil-resistant baking paper comprises the following steps: complicated coating process, large equipment investment, high production power consumption and the like. Therefore, there is an urgent need to develop a simple and easy-to-implement sizing agent and coating process, and to apply to the preparation of baking paper.
Disclosure of Invention
The invention aims to provide a sizing agent and application thereof in preparing anti-sticking oil-resistant baking paper, the sizing agent is favorable for improving the anti-sticking and oil-resistant properties of the baking paper, and is applied to the preparation of the baking paper, and the sizing agent can simplify the coating process, improve the production efficiency and reduce the production cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a sizing agent, which is composed of a surface sizing agent and/or an internal sizing agent, the surface sizing agent comprising, in parts by weight: 100 parts of silicone oil emulsion, 1-10 parts of sodium carboxymethyl cellulose, 1.5-5 parts of cross-linking agent, 5-10 parts of catalyst, 30-70 parts of filling auxiliary agent and 250-400 parts of water; the internal sizing agent comprises the following components in parts by weight: 1 part of rosin size and 4-8 parts of aluminum sulfate.
Preferably, the filling aid is selected from: at least one of vinyl silicone oil, methyl vinyl silicone resin, sodium silicate, potassium silicate, aluminum silicate, calcium silicate, magnesium silicate and silane coupling agent; further preferably, the molecular weight of the vinyl silicone oil is 300-30000, wherein the mass content of vinyl is 2-5%; further preferably, the methyl vinyl silicone resin has a molecular weight of 500-20000, wherein the mass content of vinyl is 1-3%; further preferably, the silane coupling agent is gamma-aminopropyl triethoxysilane; further preferably, the filling auxiliary agent is at least one selected from sodium silicate, potassium silicate, aluminum silicate, calcium silicate and magnesium silicate and is compounded with a silane coupling agent.
Preferably, the preparation method of the surface sizing agent comprises the following steps:
(1) According to the weight parts of the surface sizing agent, firstly, mixing silicone oil emulsion, sodium carboxymethyl cellulose, a cross-linking agent, a catalyst and 50% of water to obtain a mixed solution A;
(2) Mixing a filling auxiliary agent with the residual water to obtain a mixed solution B;
(3) And mixing the mixed solution A and the mixed solution B to obtain the surface sizing agent.
In a second aspect, the invention provides the use of said sizing agent in the preparation of baking paper.
In a third aspect, the present invention provides a baking paper having a protective layer on the surface thereof, the protective layer being formed on the surface of the base paper by the sizing agent according to any one of claims 1 to 3.
In a fourth aspect, the invention provides a preparation method of anti-sticking oil-resistant baking paper, which adopts the sizing agent, and the sizing agent comprises the following components: surface sizing agents and internal sizing agents; the preparation method comprises the following steps:
Step 1, mixing wood pulp, retention and drainage aids, reinforcing agents and sizing agents in the pulp, carrying out papermaking forming treatment, and sequentially carrying out squeezing dehydration and primary drying treatment to obtain wet paper sheets with 85-99% of water;
Step 2, carrying out double-sided sizing treatment on the wet paper sheet by adopting the surface sizing agent;
Step 3, sequentially carrying out secondary drying, calendaring and curling treatment on the paper sheet subjected to the double-sided sizing treatment to obtain the baking paper; the secondary drying temperature is 120-130 ℃.
Preferably, the wood pulp comprises the following components in percentage by weight: 30-70% of softwood pulp and 30-70% of hardwood pulp.
Preferably, in the step 1, the mass ratio of wood pulp, retention and drainage aid, reinforcing agent and rosin size in the internal sizing agent is 100: 0.02-0.03: 0.5 to 0.8: 0.5-2.
Preferably, the retention and drainage aid is at least one of polyacrylamide, cationic starch, guar gum, bentonite and silica sol microparticle combined system; and/or the reinforcing agent is at least one of modified starch, polyamide epichlorohydrin resin and guar gum.
Preferably, the absolute dry coating weight of the surface sizing agent is 0.3-2 g/m < 2 >; further preferably, the sizing means is a die transfer or two roll impregnation means.
Preferably, the preparation method further comprises: the wet paper sheet is sprayed with at least one of metal salt solutions of aluminum, lead, iron, tin, silver, aluminum and copper, more preferably an aluminum sulfate solution, and even more preferably an aluminum sulfate solution having a mass concentration of 10% before the double-sided sizing treatment.
The invention has the technical effects that:
After the surface sizing agent in the sizing agent disclosed by the invention is coated on paper, silicone oil and a crosslinking agent in the surface sizing agent can be crosslinked under the action of a catalyst at a high temperature of secondary drying so as to form a protective layer, and silicon atoms in the surface sizing agent have low surface energy so as to play a good role in preventing adhesion. The addition of sodium carboxymethyl cellulose can increase the viscosity and water-retaining property of the sizing agent, has certain oil resistance, and can reduce the penetration of the sizing agent into the base paper. In addition, a filling aid is added: the filling auxiliary agent can be filled in the gap of the protective layer to further improve the oil resistance. The internal sizing agent adopts rosin size and aluminum sulfate, the proportion of the rosin size to the aluminum sulfate is 1:4-8, and excessive aluminum sulfate added or sprayed on the surface of the paper is used for making the rosin size stay on the surface of the paper in a large amount, and the sodium carboxymethyl cellulose in the coating is combined to seal the surface of the paper in a film mode, so that the penetration of the sizing agent can be further reduced, the retention rate of emulsion silicon on the surface is improved, and the effective retention of the emulsion silicon is beneficial to improving the oil resistance.
On the other hand, the preparation method of the baking paper disclosed by the invention has the advantage that the obtained baking paper has excellent anti-sticking and oil-resistant properties through only one-time in-machine coating process.
Drawings
Fig. 1 is a physical view of a baking paper 1 according to the present invention.
Detailed Description
In the description of the present invention, it is to be noted that the specific conditions are not specified in the examples, and the description is performed under the conventional conditions or the conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In the examples and comparative examples of the present invention, the release properties were measured by: the temperature of the test box is set to 220 ℃, and the paper sample wrapped with the chicken wings is put on a baking tray of the test box to be baked for 30min. Taking out the baking tray, placing the baking tray in a constant temperature and humidity laboratory, cooling for 60min, and checking whether the chicken wings are adhered to the sample.
The method for measuring the oil resistance comprises the following steps: the detection method refers to Tappi UM 557 standard, and the oil-proof grade (12 grades in total) of the paper sample is examined.
In the embodiment of the invention, the catalyst used for preparing the surface sizing agent is platinum, and the cross-linking agent is hydrogen-containing silicone oil.
The technical solution of the present invention will be clearly and fully described in conjunction with the following detailed description, but the following examples are only limited to a part of the study of the present invention, and are merely illustrative of the present invention, and should not be construed as limiting the scope of the present invention. Based on this, other embodiments, which can be obtained by a person skilled in the art without making any inventive effort, fall within the scope of protection of the present invention. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
The embodiment provides a sizing agent, which consists of a surface sizing agent and an internal sizing agent, wherein the surface sizing agent comprises the following components in parts by weight: 100 parts of silicone oil emulsion, 3 parts of sodium carboxymethyl cellulose, 5 parts of cross-linking agent, 5 parts of catalyst, 60 parts of vinyl silicone oil with the molecular weight of 500-20000 (the mass content of vinyl is 3 percent), and 400 parts of water; the internal sizing agent comprises the following components in parts by weight: rosin size 1 part and aluminum sulfate 6 parts. The preparation method of the sizing agent comprises the following steps:
Adding 50% of water into the dissolving tank A, starting mechanical stirring, slowly adding sodium carboxymethylcellulose, continuing stirring for 30min after the adding is finished until the dissolving is complete, then adding silicone oil emulsion, a catalyst and a crosslinking agent, and uniformly mixing for later use; adding residual water into the dissolving tank B, adding vinyl silicone oil while stirring, and uniformly stirring for later use; and mixing the solution in the dissolving tank A with the solution in the dissolving tank B, and mechanically stirring for 10min to obtain the composite surface sizing solution, wherein the solution A and the solution B need to be used as soon as possible after being compounded. The resulting surface sizing agent had a solids content of 15% and a viscosity of 65Cp.
Example 2
The embodiment provides a sizing agent, which consists of a surface sizing agent and an internal sizing agent, wherein the surface sizing agent comprises the following components in parts by weight: 100 parts of silicone oil emulsion, 5 parts of sodium carboxymethyl cellulose, 3 parts of cross-linking agent, 5 parts of catalyst, 60 parts of sodium silicate and 400 parts of water; the internal sizing agent comprises the following components in parts by weight: rosin size 1 part and aluminum sulfate 6 parts. The sizing agent was prepared in the same manner as in example 1. The surface sizing agent obtained had a solids content of 18% and a viscosity of 120Cp.
Example 3
The embodiment provides a sizing agent, which consists of a surface sizing agent and an internal sizing agent, wherein the surface sizing agent comprises the following components in parts by weight: 100 parts of silicone oil emulsion, 5 parts of sodium carboxymethyl cellulose, 3 parts of cross-linking agent, 5 parts of catalyst, 60 parts of sodium silicate, 5 parts of silane coupling agent and 400 parts of water; the internal sizing agent comprises the following components in parts by weight: rosin size 1 part and aluminum sulfate 6 parts. The sizing agent was prepared in the same manner as in example 1. The surface sizing agent obtained had a solids content of 18% and a viscosity of 120Cp.
Example 4
The sizing agent of this example differs from that of example 1 in that: the filling aid was replaced with methyl vinyl silicone resin having a molecular weight of 5000 to 20000 (wherein the mass content of vinyl groups is 3%), otherwise the same as in example 1.
Example 5
The sizing agent of this example differs from that of example 2 in that: the filling aid was replaced by sodium silicate and calcium silicate (mass ratio 1:1) otherwise as in example 2.
Example 6
The sizing agent of this example differs from that of example 3 in that: sodium silicate is replaced by calcium silicate, otherwise as in example 3.
Example 7
The sizing agent of this example differs from that of example 3 in that: the amount of aluminum sulfate was 4 parts, and the same as in example 3 was repeated.
Example 8
The sizing agent of this example differs from that of example 3 in that: the amount of aluminum sulfate used was 8 parts, and the same as in example 3 was repeated.
Comparative example 1
The sizing agent of this comparative example differs from that of example 1 in that: the procedure of example 1 was followed except that the filler-free auxiliary was used, and the amount of the crosslinking agent was 3 parts. The preparation method of the sizing agent comprises the following steps:
Adding water into the dissolving tank A, starting mechanical stirring, slowly adding sodium carboxymethylcellulose, continuing stirring for 30min after the adding is finished until the dissolving is complete, and then adding silicone oil emulsion, a catalyst and a crosslinking agent, and uniformly mixing for later use.
Comparative example 2
The sizing agent of this comparative example differs from that of example 1 in that: the internal sizing agent comprises the following components in parts by weight: rosin size 1 part and aluminum sulfate 3 parts.
Comparative example 3
The sizing agent of this comparative example differs from that of example 1 in that: the vinyl silicone oil is 25 parts and the cross-linking agent is 4 parts.
Comparative example 4
The sizing agent of this comparative example differs from that of example 1 in that: the dosage of the vinyl silicone oil is 90 parts, and the dosage of the cross-linking agent is 6 parts.
Examples 1-8 and comparative examples 1-4 were prepared as follows:
Step 1, wood pulp (the pulping and pulp preparation treatment process of the wood pulp is the same as that of comparative example 5), polyacrylamide (PAM), polyamide epichlorohydrin resin (PAE) and an internal sizing agent are mixed, and then the pulp is manufactured and molded, the speed of the pulp is 300m/min, and then the pulp is sequentially subjected to squeezing and dehydration, and primary drying treatment is carried out at 105 ℃ to obtain paper with 85-99% of water content; the mass ratio of rosin size in the wood pulp, PAM, PAE and internal sizing agent is as follows: 100:0.02:0.5:1.5;
Step 2, using a film transfer sizing machine, and adopting a surface sizing agent to carry out double-sided sizing treatment on the wet paper sheet; wherein the front side application amount of the paper sheet is 0.6g/m 2, and the back side application amount is 0.8g/m 2;
And 3, sequentially carrying out secondary drying, calendaring and curling treatment on the paper sheet subjected to the double-sided sizing treatment at 125 ℃ to obtain the baking paper (examples 1-8 sequentially correspond to the baking paper 1-8 and comparative examples 1-4 sequentially correspond to the baking paper 12-15), wherein a real object of the baking paper 1 is shown in fig. 1.
Example 3 was prepared as follows for batches of baking paper:
Step 1, wood pulp (the pulping and pulp preparation treatment process of the wood pulp is the same as that of comparative example 5), PAM, PAE and an internal sizing agent are mixed, and then the pulp is manufactured and formed, the speed of the pulp is 300m/min, and then the pulp is sequentially subjected to squeezing dehydration and primary drying treatment at 105 ℃ to obtain paper with 85-99% of water; the mass ratio of rosin size in the wood pulp, PAM, PAE and internal sizing agent is as follows: 100:0.02:0.06:1.0;
Step 2, spraying 10% aluminum sulfate solution (other batches are replaced by 10% copper chloride solution or 5% ferric sulfate solution) on the wet paper, wherein the spraying amount is 2g/m 2 of each surface;
Step 3, using a film transfer sizing machine, and adopting a surface sizing agent to carry out double-sided sizing treatment on the wet paper sheet; wherein the front side application amount of the paper sheet is 0.6g/m 2, and the back side application amount is 0.8g/m 2;
Step 4, the paper sheet after the double-sided sizing treatment is subjected to secondary drying, calendaring and curling treatment at 125 ℃ in sequence, so that the baking paper is obtained (aluminum sulfate spraying corresponds to the baking paper 9, copper chloride spraying corresponds to the baking paper 10 and ferric sulfate spraying corresponds to the baking paper 11)
Comparative example 5
This comparative example provides the inventors with an initial search for a method of preparing a baking paper, specifically as follows:
step 1, pulping softwood pulp and hardwood pulp to 75+/-1 DEG SR respectively, and carrying out pulp blending according to the proportion of 50:50, wherein the addition amount of the auxiliary agent is as follows: PAM (0.02%), PAE (0.5%), rosin gum (1.5%), aluminum sulfate (4.5%), based on 100% wood pulp.
Step 2, adding 200 parts of water into the dissolution tank A, starting mechanical stirring, slowly adding 3 parts of sodium carboxymethylcellulose, continuing stirring for 30min after the addition is finished until the dissolution is complete, and then adding 100 parts of emulsion silicone oil, 5 parts of catalyst and 3 parts of cross-linking agent, and uniformly mixing for later use; the resulting surface size had a solids content of 15% and a viscosity of 85Cp.
Step 3, manufacturing paper pulp on a paper machine, squeezing, and drying at 105 ℃ before obtaining a wet paper sheet;
Step 4, spraying 10% aluminum sulfate solution on the wet paper, wherein the spraying amount is 2g/m 2 of each surface;
And 5, carrying out surface sizing treatment by using a film transfer sizing machine, wherein the application amount of the front composite surface sizing solution is 1.0g/m 2, the application amount of the back composite surface sizing solution is 1.2g/m 2, and drying, calendaring and curling at 125 ℃ to obtain oil-resistant baking paper (corresponding to baking paper 16).
Comparative example 6
This comparative example provides the inventors with an initial search for a method of preparing a baking paper, specifically as follows:
step 1, pulping softwood pulp and hardwood pulp to 75+/-1 DEG SR respectively, and carrying out pulp blending according to the proportion of 50:50, wherein the addition amount of the auxiliary agent is as follows: PAM (0.02%), PAE (0.5%), rosin gum (1.5%), aluminum sulfate (4.5%), based on 100% wood pulp.
Step 2, adding 200 parts of water into the dissolution tank A, starting mechanical stirring, slowly adding 3 parts of sodium carboxymethylcellulose, continuing stirring for 30min after the addition is finished until the dissolution is complete, and then adding 100 parts of emulsion silicone oil, 5 parts of catalyst and 3 parts of cross-linking agent, and uniformly mixing for later use; the resulting surface size had a solids content of 15% and a viscosity of 85Cp.
Step 3, manufacturing paper pulp on a paper machine, squeezing, and drying at 105 ℃ before obtaining a wet paper sheet;
And 4, carrying out surface sizing treatment by using a film transfer sizing machine, wherein the application amount of the front composite surface sizing solution is 1.0g/m 2, the application amount of the back composite surface sizing solution is 1.2g/m 2, and drying, calendaring and curling at 125 ℃ to obtain oil-resistant baked paper (corresponding to baking paper 17).
The inventor finds that in the experimental process, the aqueous release agent system is directly used for in-machine coating, and as the base paper is not subjected to surface sizing and calendaring treatment, the base paper is relatively open, loose and porous; and the base paper is not completely cooked, so that the water absorption is higher. The release agent permeates into the base paper more, so that the oil resistance is lower. Proper thickening of the coating can reduce penetration but with limited improvement. The excessive aluminum sulfate is added into the base paper, so that the paint is obviously thickened and the oil-proof performance is improved. The inventors have further found that if added too much (e.g. up to 10 times the amount of rosin size) the paper becomes acidic and brittle, whereas the surface coating with aluminium sulphate avoids such problems and the oil repellency improvement is more pronounced. And after the filling auxiliary agent is added, the oil resistance can be further improved.
The results of all the above cases are shown in table 1.
Table 1 summary of experimental results
From the data in table 1, it can be seen that the baking paper 9 has the best anti-adhesion and oil-resistant comprehensive performance, and the baking paper 11 is the next, and other baking papers 1-8 and 10 of the invention can also have relatively good anti-adhesion and oil-resistant comprehensive performance, and the paper thickness is moderate. In addition, in the preparation process of the invention, the application amount of the surface sizing agent is significantly reduced.
In addition, the baking paper meets various regulations in GB 9685-2016 national food safety Standard food contact Material and additive use Standard for products.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (11)
1. A sizing agent characterized in that: the surface sizing agent consists of a surface sizing agent and/or an internal sizing agent, wherein the surface sizing agent comprises the following components in parts by weight: 100 parts of silicone oil emulsion, 1-10 parts of sodium carboxymethyl cellulose, 1.5-5 parts of cross-linking agent, 5-10 parts of catalyst, 30-70 parts of filling auxiliary agent and 250-400 parts of water; the internal sizing agent comprises the following components in parts by weight: 1 part of rosin size and 4-8 parts of aluminum sulfate.
2. The sizing agent of claim 1, wherein: the filling aid is selected from the group consisting of: at least one of vinyl silicone oil, methyl vinyl silicone resin, sodium silicate, potassium silicate, aluminum silicate, calcium silicate, magnesium silicate and silane coupling agent; preferably, the molecular weight of the vinyl silicone oil is 300-30000, wherein the mass content of vinyl is 2-5%; preferably, the molecular weight of the methyl vinyl silicone resin is 500-20000, wherein the mass content of vinyl is 1-3%; preferably, the silane coupling agent is gamma-aminopropyl triethoxysilane; preferably, the filling auxiliary agent is at least one selected from sodium silicate, potassium silicate, aluminum silicate, calcium silicate and magnesium silicate and is compounded with a silane coupling agent.
3. The sizing agent of claim 1, wherein: the preparation method of the surface sizing agent comprises the following steps:
(1) According to the weight parts of the surface sizing agent, firstly, mixing silicone oil emulsion, sodium carboxymethyl cellulose, a cross-linking agent, a catalyst and 50% of water to obtain a mixed solution A;
(2) Mixing a filling auxiliary agent with the residual water to obtain a mixed solution B;
(3) And mixing the mixed solution A and the mixed solution B to obtain the surface sizing agent.
4. Use of the sizing agent according to any one of claims 1 to 3 for the preparation of baking paper.
5. A baking paper, characterized in that: the surface of the baking paper is provided with a protective layer, and the protective layer is formed by the sizing agent according to any one of claims 1-3 on the surface of the base paper.
6. A preparation method of anti-sticking oil-resistant baking paper is characterized by comprising the following steps: the sizing agent according to any one of claims 1 to 3 is used, and the sizing agent comprises the following components: surface sizing agents and internal sizing agents; the preparation method comprises the following steps:
Step 1, mixing wood pulp, retention and drainage aids, reinforcing agents and sizing agents in the pulp, carrying out papermaking forming treatment, and sequentially carrying out squeezing dehydration and primary drying treatment to obtain wet paper sheets with 85-99% of water;
Step 2, carrying out double-sided sizing treatment on the wet paper sheet by adopting the surface sizing agent;
Step 3, sequentially carrying out secondary drying, calendaring and curling treatment on the paper sheet subjected to the double-sided sizing treatment to obtain the baking paper; the secondary drying temperature is 120-130 ℃.
7. The method of manufacturing according to claim 6, wherein: the wood pulp comprises the following components in percentage by weight: 30-70% of softwood pulp and 30-70% of hardwood pulp.
8. The preparation method according to claim 6 or 7, characterized in that: in the step 1, the mass ratio of wood pulp, retention and drainage aid, reinforcing agent and rosin size in the internal sizing agent is 100: 0.02-0.03: 0.5 to 0.8: 0.5-2.
9. The method of manufacturing according to claim 8, wherein: the retention and drainage aid is at least one of polyacrylamide, cationic starch, guar gum, bentonite and silica sol microparticle combined system; and/or the reinforcing agent is at least one of modified starch, polyamide epichlorohydrin resin and guar gum.
10. The preparation method according to any one of claims 6 to 9, characterized in that: the absolute dry coating weight of the surface sizing agent is 0.3-2 g/m 2; preferably, the sizing is a die transfer or two-roll impregnation.
11. The preparation method according to any one of claims 6 to 10, characterized in that: the preparation method further comprises the following steps: the wet paper sheet is sprayed with at least one of metal salt solutions of aluminum, lead, iron, tin, silver, aluminum and copper, preferably an aluminum sulfate solution, and more preferably an aluminum sulfate solution with a mass concentration of 10% before the double-sided sizing treatment.
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