CN115538208B - Preparation process of environment-friendly recycled paper - Google Patents
Preparation process of environment-friendly recycled paper Download PDFInfo
- Publication number
- CN115538208B CN115538208B CN202211219672.2A CN202211219672A CN115538208B CN 115538208 B CN115538208 B CN 115538208B CN 202211219672 A CN202211219672 A CN 202211219672A CN 115538208 B CN115538208 B CN 115538208B
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- China
- Prior art keywords
- waste paper
- reaction
- paper
- water
- cationic
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- 238000002360 preparation method Methods 0.000 title claims abstract description 43
- 239000010893 paper waste Substances 0.000 claims abstract description 71
- 125000002091 cationic group Chemical group 0.000 claims abstract description 53
- 239000002994 raw material Substances 0.000 claims abstract description 51
- 239000000945 filler Substances 0.000 claims abstract description 44
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000853 adhesive Substances 0.000 claims abstract description 34
- 230000001070 adhesive effect Effects 0.000 claims abstract description 34
- 238000001035 drying Methods 0.000 claims abstract description 34
- 239000012535 impurity Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000004537 pulping Methods 0.000 claims abstract description 30
- 238000012216 screening Methods 0.000 claims abstract description 15
- 238000003490 calendering Methods 0.000 claims abstract description 7
- 239000002761 deinking Substances 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 238000004513 sizing Methods 0.000 claims abstract description 7
- 238000003860 storage Methods 0.000 claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims description 58
- 238000006243 chemical reaction Methods 0.000 claims description 51
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 40
- 239000000843 powder Substances 0.000 claims description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 30
- 229920006320 anionic starch Polymers 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 26
- 239000000344 soap Substances 0.000 claims description 23
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Natural products OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 22
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 21
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 20
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 20
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 18
- 235000019353 potassium silicate Nutrition 0.000 claims description 18
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 18
- 235000010413 sodium alginate Nutrition 0.000 claims description 16
- 239000000661 sodium alginate Substances 0.000 claims description 16
- 229940005550 sodium alginate Drugs 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 15
- 239000004113 Sepiolite Substances 0.000 claims description 14
- 229910052624 sepiolite Inorganic materials 0.000 claims description 14
- 235000019355 sepiolite Nutrition 0.000 claims description 14
- 238000005507 spraying Methods 0.000 claims description 13
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 12
- GXBYFVGCMPJVJX-UHFFFAOYSA-N Epoxybutene Chemical compound C=CC1CO1 GXBYFVGCMPJVJX-UHFFFAOYSA-N 0.000 claims description 11
- 229920002472 Starch Polymers 0.000 claims description 11
- VAYGXNSJCAHWJZ-UHFFFAOYSA-N dimethyl sulfate Chemical compound COS(=O)(=O)OC VAYGXNSJCAHWJZ-UHFFFAOYSA-N 0.000 claims description 11
- 239000003999 initiator Substances 0.000 claims description 11
- 235000006408 oxalic acid Nutrition 0.000 claims description 11
- 239000008107 starch Substances 0.000 claims description 11
- 235000019698 starch Nutrition 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 11
- 235000019441 ethanol Nutrition 0.000 claims description 10
- 230000007062 hydrolysis Effects 0.000 claims description 10
- 238000006460 hydrolysis reaction Methods 0.000 claims description 10
- QVDTXNVYSHVCGW-ONEGZZNKSA-N isopentenol Chemical compound CC(C)\C=C\O QVDTXNVYSHVCGW-ONEGZZNKSA-N 0.000 claims description 10
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 9
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 7
- 229940047670 sodium acrylate Drugs 0.000 claims description 7
- JLTDJTHDQAWBAV-UHFFFAOYSA-N N,N-dimethylaniline Chemical compound CN(C)C1=CC=CC=C1 JLTDJTHDQAWBAV-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- QDCPNGVVOWVKJG-VAWYXSNFSA-N 2-[(e)-dodec-1-enyl]butanedioic acid Chemical compound CCCCCCCCCC\C=C\C(C(O)=O)CC(O)=O QDCPNGVVOWVKJG-VAWYXSNFSA-N 0.000 claims description 5
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 3
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical group C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 3
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 3
- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 claims description 3
- WVRNUXJQQFPNMN-VAWYXSNFSA-N 3-[(e)-dodec-1-enyl]oxolane-2,5-dione Chemical compound CCCCCCCCCC\C=C\C1CC(=O)OC1=O WVRNUXJQQFPNMN-VAWYXSNFSA-N 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 239000012467 final product Substances 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 33
- 239000000047 product Substances 0.000 description 29
- 229910000275 saponite Inorganic materials 0.000 description 7
- 150000001768 cations Chemical class 0.000 description 5
- 239000003093 cationic surfactant Substances 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229920001131 Pulp (paper) Polymers 0.000 description 3
- 239000003945 anionic surfactant Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 125000001453 quaternary ammonium group Chemical group 0.000 description 3
- 150000001450 anions Chemical class 0.000 description 2
- 239000010428 baryte Substances 0.000 description 2
- 229910052601 baryte Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical group O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 229940072056 alginate Drugs 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000007942 carboxylates Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005956 quaternization reaction Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000002444 silanisation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/06—Mineral fibres, e.g. slag wool, mineral wool, rock wool
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/26—Macromolecular compounds or prepolymers
- C03C25/32—Macromolecular compounds or prepolymers obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
-
- 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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/36—Inorganic fibres or flakes
- D21H13/38—Inorganic fibres or flakes siliceous
-
- 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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/06—Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
-
- 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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/13—Silicon-containing compounds
-
- 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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/14—Carboxylic acids; 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
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
-
- 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
- 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
- D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or paper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Abstract
The invention discloses a preparation process of environment-friendly recycled paper, which comprises the following steps: (1) pretreatment of waste paper raw materials: placing the waste paper raw material into a fluidized bed to remove free impurities, cutting the waste paper, humidifying the waste paper by adopting an ethanol solution, then entering an airflow stirrer, and adding a cationic filler to remove adhesive impurities; (2) pulping: inputting the pretreated waste paper raw materials into a pulper, pulping, deinking, screening and purifying, discharging impurities, and enabling the obtained pulp to enter a pulp storage tank; (3) papermaking: pulping, regulating pulp, screening, squeezing, drying, surface sizing, drying and calendaring to obtain the final product. The process of the invention not only can effectively remove the adhesive in the waste paper, but also can improve the paper performance.
Description
Technical Field
The invention belongs to the technical field of recycled paper, and particularly relates to a preparation process of environment-friendly recycled paper.
Background
The regenerated paper is paper produced by using waste paper as raw material and through crushing, decolorizing and pulping. 80% of the raw materials are derived from the recycled waste paper and are called low-energy-consumption and light-pollution environment-friendly paper.
Among them, the removal of stickies during the papermaking process is a major challenge. The stickies are all materials which are different in sources and have permanent or temporary viscosity in the waste paper recycling process, and can cause problems and reduce the quality of products in the papermaking process. The physical and chemical properties of the adhesive mainly relate to aspects of viscosity, lipophilicity, deformability, surface electronegativity and the like. The adhesive contains pressure-sensitive adhesives, coating adhesives, resins and other components, and the components generally have low surface energy, so that the components have high viscosity, are easily mutually aggregated into large particles and are adhered to the surface of hydrophobic equipment.
The harm of the adhesive is mainly expressed as follows: (1) Deposited on the forming net to block the meshes, so that water filtering is difficult, and the shutdown cleaning time is increased; (2) The paper sheet is deposited on the press felt and the press roller, so that the service life of the felt is shortened, and the paper sheet dehydration is affected; (3) adhering to the dryer surface causing paper breaks in the paper machine; (4) remain in the sheet to form a stain.
The invention patent CN107938421B discloses a manufacturing method of recycled paper and the recycled paper, wherein the adhesive is removed by adopting a pure mechanical method, and the adhesive removing effect is difficult to ensure. Most of the existing processes try to remove the adhesive in the waste paper in the pulping or papermaking process, all the processes of dissolving, dispersing, adhering, depositing and the like of the adhesive in water are involved, the property of the adhesive in water is variable, and great challenges are brought to the problem of the adhesive.
In summary, how to design an environment-friendly recycled paper preparation process, which can remove the adhesive by combining pretreatment of waste paper raw materials with mechanical methods in pulping and papermaking processes, and improve the product quality of the recycled paper is a problem which needs to be solved at present.
Disclosure of Invention
The invention aims to solve the technical problems, and provides an environment-friendly recycled paper preparation process, which can comprehensively improve the product quality of the recycled paper by removing adhesives through a pretreatment dry method of waste paper raw materials and adding functional fibers and anionic starch in the papermaking process.
The invention realizes the above purpose through the following technical scheme:
an environment-friendly recycled paper preparation process comprises the following steps:
(1) Pretreatment of waste paper raw materials: placing waste paper raw material into a fluidized bed to remove free impurities, cutting the waste paper, humidifying the waste paper by adopting an ethanol solution (the volume concentration is 30-80%, and the dosage is 3-6% of the mass of the waste paper), and then stirring the waste paper in an airflow stirrer (the air inlet amount per unit section of a groove body is 0.4-0.8 m) 3 /(min•m 2 ) Adding a cationic filler to remove the adhering impurities, and then separating the impurities from the filler;
(2) Pulping: inputting the pretreated waste paper raw materials into a pulper, pulping, deinking, screening and purifying, discharging impurities, and enabling the obtained pulp to enter a pulp storage tank;
(3) Papermaking: pulping, regulating pulp, screening, squeezing, drying, surface sizing, drying and calendaring to obtain the final product.
The preparation method of the cationic filler comprises the following steps:
s1, uniformly mixing 3-aminopropyl triethoxysilane, acetic acid and water, stirring for 30-60 min to obtain a hydrolysis solution, drying nano soap stone powder, heating to 100-110 ℃, adding the hydrolysis solution in an atomized form, and stirring for reaction for 3-5 h;
s2, adding toluene into the material obtained in the step S2, then adding N, N-dimethyl oxalic acid, stirring at 120-130 ℃ for reaction for 4-5 hours, adding isopropanol into the product after the toluene is distilled off under reduced pressure, then dropwise adding dimethyl sulfate, reacting at 80-85 ℃ for 1-3 hours, and distilling off the isopropanol under reduced pressure to obtain cationic soap powder;
s3, spraying water glass (with Baume degree of 0.4-0.6 and modulus of 2.5-3) on the surface of the dried barite powder, spraying cationic soap powder on the surface of the water glass, and curing at normal temperature to obtain the cationic filler.
Further, the addition amount of the cationic filler is 4-10% of the mass of the humidified waste paper, and the molar ratio of the 3-aminopropyl triethoxysilane, the N, N-dimethyl oxalic acid and the dimethyl sulfate is 1: (1-1.2): (1-1.1).
Further, in step S1, the mass ratio of 3-aminopropyl triethoxysilane, acetic acid, and water is 1: (0.1-0.2): (0.3-0.8), the mass ratio of the 3-aminopropyl triethoxysilane to the nano soap powder is (0.5-1.5): 100.
further, in the step S3, the mass ratio of the barite powder, the water glass and the cationic soap powder is 1: (0.2-0.4): (0.1-0.3).
The invention also provides a functional fiber in the preparation process of the environment-friendly regenerated paper, the functional fiber is added in the step (3) of pulp mixing, and the preparation method comprises the following steps:
A. carrying out polyaddition reaction on 3, 4-epoxy-1-butene and isopentenol under the action of an initiator, wherein the reaction temperature is 60-80 ℃ and the reaction time is 4-6 h, so as to obtain a polyaddition product;
B. dissolving sodium alginate in water, then adjusting the pH value to 9-9.5 by sodium hydroxide, adding the polyaddition product obtained in the step A, stirring at 55-65 ℃ for reacting for 2-3 h, and separating out by using absolute ethyl alcohol to obtain modified sodium alginate;
C. uniformly mixing modified sodium alginate with water, adding sepiolite fiber, stirring and adsorbing for 1-2 h, slowly introducing into a calcium chloride solution (30 ℃ and concentration of 5%), standing for 30-40 min, filtering out liquid, washing with water, and drying to obtain the functional fiber.
Further, the addition amount of the functional fiber is 3-8% of the mass of the pretreated waste paper raw material, and the molar ratio of the 3, 4-epoxy-1-butene, the isopentenol and the sodium alginate is 1: (0.4-1): (1-3).
In the step A, the initiator is benzoyl peroxide/N, N-dimethylaniline, azodiisoheptonitrile or diisopropyl peroxydicarbonate, and the addition amount of the initiator is 0.2-0.4% of the mass of the reaction raw material.
Further, in the step B, the mass ratio of sodium alginate to water is 1: (25-35); in the step C, the mass ratio of the modified sodium alginate to the water to the sepiolite fiber is 1: (20-40): (18-40), the mole ratio of the modified sodium alginate to the calcium chloride is 1: (0.5-1).
The invention also provides the anionic starch in the preparation process of the environment-friendly regenerated paper, the anionic starch is added in the step (3) of size mixing, and the preparation method comprises the following steps:
and (3) carrying out polyaddition reaction on sodium acrylate and dodecenyl succinic acid under the condition of triggering potassium persulfate, uniformly mixing the obtained product with starch and sodium carbonate, introducing the mixture into a ball mill for reaction for 2-3 h at the temperature of 60-70 ℃, washing the obtained product with 90% ethanol, and then drying to obtain the anionic starch.
Further, the addition amount of the anionic starch is 2-5% of the mass of the pretreated waste paper raw material, and the molar ratio of the sodium acrylate to the dodecenyl succinic anhydride is 1: (1-1.2), wherein the addition amount of the potassium persulfate is 0.1-0.2% of the total mass of the reaction raw materials; the mass ratio of starch, sodium carbonate and the product obtained by the polyaddition reaction is 1: (0.05-0.07): (0.6-1).
The invention has the beneficial effects that:
(1) Before papermaking, the waste paper raw material is pretreated, and free impurities and adhesive impurities in the waste paper are sequentially removed, so that the impurity content in the waste paper raw material is reduced, and the influence of the impurities on the papermaking process and the quality of the regenerated paper is avoided.
(2) The adhesive impurities in the waste paper raw materials are mainly adhesive substances, and the surface of the waste paper is generally present, and the adhesive impurities are removed by adopting a dry method in the pretreatment stage of the waste paper, so that the adhesive substances in the adhesive impurities can be prevented from entering water and equipment in the subsequent process, causing deposition and affecting the quality of the regenerated paper.
(3) The cation filler disclosed by the invention adopts barite as a matrix, the weight of the filler is increased, so that the cation filler can be separated from paper after adsorbing impurities, then the surface of the barite is bonded with the cation saponite powder through water glass, the saponite powder is strong in adsorptivity, and the cation saponite powder can effectively adsorb the adhesive impurities in the waste paper raw materials.
(4) When the cationic soapstone powder is prepared, the nano soapstone powder sequentially carries out silanization reaction, condensation reaction and quaternization reaction with 3-aminopropyl triethoxysilane, N-dimethyl oxalic acid and dimethyl sulfate, and compared with the method that the nano soapstone powder is directly subjected to cationic surfactant treatment, the cationic soapstone powder obtained by the method is more stable.
(5) The invention prepares the regenerated paper by using the functional fiber and the waste paper, and can effectively improve the strength and the folding endurance of the paper.
(6) The functional fiber is prepared by taking sepiolite fiber as a matrix and then forming sodium alginate gel on the surface and pores of the sepiolite fiber, so that the strength of the functional fiber can be effectively improved, and the strength of paper is improved.
(7) In the preparation of the functional fiber, the polymer grafting modification is also carried out on the sodium alginate, and the gel formed by the obtained modified sodium alginate can further enhance the mechanical property of the functional high fiber.
(8) In order to prevent the modified sodium alginate from being influenced by gel caused by reduced hydrophilicity caused by the introduction of the polymer, the invention introduces an unsaturated compound with hydroxyl during the polyaddition reaction, so that the hydrophilicity of the modified sodium alginate is improved.
(9) Because the cationic filler is adopted in the pretreatment stage of the waste paper, the cationic filler is easy to be partially adsorbed on the surface of the paper to enter the papermaking process, and the surface of the functional fiber added in the invention forms sodium alginate gel containing carboxyl, so that charge attraction exists between the functional fiber and the cationic filler to influence the dispersion of the functional fiber in paper pulp. Therefore, it is necessary to add an anionic substance to alleviate the attraction of the cationic filler to the functional fiber, and a common anionic surfactant has weak adsorptivity and difficulty in stably exerting its dispersing action on the functional fiber although it contains anions and has good dispersibility.
In the papermaking process, the anionic starch is also added, so that stable adsorption can be formed with the cationic filler in the paper pulp, the dispersion influence of the cationic filler on the functional fibers can be counteracted, the dispersion of the functional fibers can be further promoted, and the quality of the regenerated paper is improved.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The embodiment provides a preparation process of environment-friendly recycled paper, which comprises the following steps:
(1) Pulping: inputting the pretreated waste paper raw materials into a pulper, pulping, deinking, screening and purifying, discharging impurities, and enabling the obtained pulp to enter a pulp storage tank;
(2) Papermaking: pulping, regulating pulp, screening, squeezing, drying, surface sizing, drying and calendaring to obtain the final product.
The screening and purifying steps are divided into a coarse screen and a fine screen, wherein the screening temperature is 40 ℃, the coarse screen adopts a pressure screen with a seam width of 0.20-0.4 mm, and the fine screen adopts a pressure screen with a seam width of 0.10-0.14 mm.
Example 2
The embodiment provides a preparation process of environment-friendly recycled paper, which comprises the following steps:
(1) Pretreatment of waste paper raw materials: placing waste paper raw materials into a fluidized bed to remove free impurities, cutting the waste paper, humidifying the waste paper by adopting an ethanol solution (the volume concentration is 30%, and the dosage is 3% of the mass of the waste paper), then, entering an airflow stirrer, adding a cationic filler to remove adhesive impurities, and then separating impurities from the filler;
(2) Pulping: inputting the pretreated waste paper raw materials into a pulper, pulping, deinking, screening and purifying, discharging impurities, and enabling the obtained pulp to enter a pulp storage tank;
(3) Papermaking: pulping, regulating pulp, screening, squeezing, drying, surface sizing, drying and calendaring to obtain the final product.
The cationic filler is added in an amount of 4% of the mass of the humidified waste paper, and the preparation method comprises the following steps:
s1, according to the mass ratio of 1:0.1:0.3, uniformly mixing 3-aminopropyl triethoxysilane, acetic acid and water, stirring for 30min to obtain a hydrolysis solution, drying nano-saponite powder, heating to 100 ℃, adding the hydrolysis solution in an atomized form, and stirring for reaction for 3h; the mass ratio of the 3-aminopropyl triethoxysilane to the nano soap powder is 0.5:100;
s2, adding toluene into the material obtained in the step S2, then adding N, N-dimethyl oxalic acid, stirring at 120 ℃ for reaction for 4 hours, adding isopropanol into the product after the toluene is distilled off under reduced pressure, then dropwise adding dimethyl sulfate, reacting at 80 ℃ for 1 hour, and distilling off the isopropanol under reduced pressure to obtain cationic soap powder;
s3, spraying water glass on the surface of the dried barite powder, spraying cationic soap powder on the surface of the water glass, and curing at normal temperature to obtain the cationic filler. The mass ratio of the barite powder to the water glass to the cationic soap powder is 1:0.2:0.1.
wherein, the mole ratio of the 3-aminopropyl triethoxysilane, the N, N-dimethyl oxalic acid and the dimethyl sulfate is 1:1:1.
the remainder was the same as in example 1.
Example 3
On the basis of the embodiment 2, the embodiment also provides a functional fiber in the preparation process of the environment-friendly recycled paper, wherein the functional fiber is added in the pulp mixing in the step 3, the adding amount of the functional fiber is 3% of the mass of the pretreated waste paper raw material, and the preparation method comprises the following steps:
A. carrying out polyaddition reaction on 3, 4-epoxy-1-butene and isopentenol under the action of an initiator (benzoyl peroxide/N, N-dimethylaniline, wherein the addition amount of the initiator is 0.2% of the mass of the reaction raw materials), and obtaining a polyaddition product, wherein the reaction temperature is 60 ℃ and the reaction time is 4 hours;
B. according to the mass ratio of 1:25 dissolving sodium alginate in water, then adjusting the pH value to 9 by using sodium hydroxide, then adding the polyaddition product obtained in the step A, stirring and reacting for 2 hours at 55 ℃, and then precipitating by using absolute ethyl alcohol to obtain modified sodium alginate;
C. uniformly mixing modified sodium alginate with water, adding sepiolite fiber, stirring and adsorbing for 1h, slowly introducing into a calcium chloride solution (30 ℃ and 5% concentration), standing for 30min, filtering out liquid, washing with water, and drying to obtain the functional fiber. The mass ratio of the modified sodium alginate to the water to the sepiolite fiber is 1:20:18, the mole ratio of the modified sodium alginate to the calcium chloride is 1:0.5.
wherein, the mole ratio of 3, 4-epoxy-1-butene, isopentenol and sodium alginate is 1:0.4:1.
the remainder was the same as in example 2.
Example 4
On the basis of the embodiment 3, the embodiment provides the anionic starch in the preparation process of the environment-friendly recycled paper, wherein the anionic starch is added in the step (3) of pulping, the adding amount of the anionic starch is 2% of the mass of the pretreated waste paper raw material, and the preparation method comprises the following steps:
according to the mole ratio of 1:1, carrying out polyaddition reaction on sodium acrylate and dodecenyl succinic acid under the initiation condition of potassium persulfate (the addition amount is 0.1% of the total mass of the reaction raw materials), uniformly mixing the obtained product with starch and sodium carbonate, introducing the mixture into a ball mill for reaction for 2 hours at the temperature of 60 ℃, washing the obtained product with 90% ethanol, and then drying to obtain the anionic starch.
Wherein, the mass ratio of the starch, sodium carbonate and the product obtained by the polyaddition reaction is 1:0.05:0.6.
the remainder was the same as in example 3.
Example 5
The embodiment provides a preparation process of environment-friendly recycled paper, which comprises the following steps:
(1) Pretreatment of waste paper raw materials: placing waste paper raw materials into a fluidized bed to remove free impurities, cutting the waste paper, humidifying the waste paper by adopting an ethanol solution (the volume concentration is 55%, and the dosage is 4.5% of the mass of the waste paper), then entering an airflow stirrer, adding a cationic filler to remove adhesive impurities, and then separating impurities and the filler;
(2) Pulping: inputting the pretreated waste paper raw materials into a pulper, pulping, deinking, screening and purifying, discharging impurities, and enabling the obtained pulp to enter a pulp storage tank;
(3) Papermaking: pulping, regulating pulp, screening, squeezing, drying, surface sizing, drying and calendaring to obtain the final product.
The cationic filler is added in an amount of 7% of the mass of the humidified waste paper, and the preparation method comprises the following steps:
s1, according to the mass ratio of 1:0.15:0.5, uniformly mixing 3-aminopropyl triethoxysilane, acetic acid and water, stirring for 45min to obtain a hydrolysis solution, drying nano-saponite powder, heating to 105 ℃, adding the hydrolysis solution in an atomized form, and stirring for reaction for 4h; the mass ratio of the 3-aminopropyl triethoxysilane to the nano soap powder is 1:100;
s2, adding toluene into the material obtained in the step S2, then adding N, N-dimethyl oxalic acid, stirring at 125 ℃ for reaction for 4.5 hours, adding isopropanol into the product after the toluene is distilled off under reduced pressure, then dropwise adding dimethyl sulfate for reaction for 2 hours at 83 ℃, and distilling off the isopropanol under reduced pressure to obtain cationic soap powder;
s3, spraying water glass on the surface of the dried barite powder, spraying cationic soap powder on the surface of the water glass, and curing at normal temperature to obtain the cationic filler. The mass ratio of the barite powder to the water glass to the cationic soap powder is 1:0.3:0.2.
wherein, the mole ratio of the 3-aminopropyl triethoxysilane, the N, N-dimethyl oxalic acid and the dimethyl sulfate is 1:1.1:1.05.
the embodiment also provides a functional fiber in the preparation process of the environment-friendly recycled paper, the addition amount of the functional fiber is 5.5% of the mass of the pretreated waste paper raw material, and the preparation method comprises the following steps:
A. carrying out polyaddition reaction on 3, 4-epoxy-1-butene and isopentenol under the action of an initiator (azodiisoheptonitrile, the addition amount of which is 0.3% of the mass of the reaction raw materials), wherein the reaction temperature is 70 ℃ and the reaction time is 5 hours, so as to obtain a polyaddition product;
B. according to the mass ratio of 1:30, dissolving sodium alginate in water, then adjusting the pH value to 9.2 by using sodium hydroxide, adding the polyaddition product obtained in the step A, stirring at 60 ℃ for reacting for 2.5 hours, and separating out modified sodium alginate by using absolute ethyl alcohol;
C. and uniformly mixing the modified sodium alginate with water, adding sepiolite fibers, stirring and adsorbing for 1.5 hours, slowly introducing into a calcium chloride solution, standing for 35 minutes, filtering out liquid, washing with water, and drying to obtain the functional fibers. The mass ratio of the modified sodium alginate to the water to the sepiolite fiber is 1:30:29, the mole ratio of the modified sodium alginate to the calcium chloride is 1:0.75.
wherein, the mole ratio of 3, 4-epoxy-1-butene, isopentenol and sodium alginate is 1:0.7:2.
the invention also provides the anionic starch in the preparation process of the environment-friendly regenerated paper, the addition amount of the anionic starch is 3.5% of the mass of the pretreated waste paper raw material, and the preparation method comprises the following steps:
according to the mole ratio of 1:1.1, carrying out polyaddition reaction on sodium acrylate and dodecenyl succinic acid under the initiation condition of potassium persulfate (the addition amount is 0.15% of the total mass of the reaction raw materials), uniformly mixing the obtained product with starch and sodium carbonate, introducing the mixture into a ball mill for reaction for 2.5 hours at the temperature of 65 ℃, washing the obtained product with 90% ethanol, and then drying to obtain the anionic starch.
Wherein, the mass ratio of the starch, sodium carbonate and the product obtained by the polyaddition reaction is 1:0.06:0.8.
the remainder was the same as in example 4.
Example 6
The embodiment provides a preparation process of environment-friendly recycled paper, which comprises the following steps:
(1) Pretreatment of waste paper raw materials: placing waste paper raw materials into a fluidized bed to remove free impurities, cutting the waste paper, humidifying the waste paper by adopting an ethanol solution (the volume concentration is 80%, and the dosage is 6% of the mass of the waste paper), then, entering an airflow stirrer, adding a cationic filler to remove adhesive impurities, and then separating impurities from the filler;
(2) Pulping: inputting the pretreated waste paper raw materials into a pulper, pulping, deinking, screening and purifying, discharging impurities, and enabling the obtained pulp to enter a pulp storage tank;
(3) Papermaking: pulping, regulating pulp, screening, squeezing, drying, surface sizing, drying and calendaring to obtain the final product.
The addition amount of the cationic filler is 10% of the mass of the humidified waste paper, and the preparation method comprises the following steps:
s1, according to the mass ratio of 1:0.2:0.8, uniformly mixing 3-aminopropyl triethoxysilane, acetic acid and water, stirring for 60min to obtain a hydrolysis solution, drying nano-saponite powder, heating to 110 ℃, adding the hydrolysis solution in an atomized form, and stirring for reacting for 5h; the mass ratio of the 3-aminopropyl triethoxysilane to the nano soap powder is 1.5:100;
s2, adding toluene into the material obtained in the step S2, then adding N, N-dimethyl oxalic acid, stirring at 130 ℃ for reaction for 5 hours, adding isopropanol into the product after the toluene is distilled off under reduced pressure, then dropwise adding dimethyl sulfate for reaction for 3 hours at 85 ℃, and distilling off the isopropanol under reduced pressure to obtain cationic soap powder;
s3, spraying water glass on the surface of the dried barite powder, spraying cationic soap powder on the surface of the water glass, and curing at normal temperature to obtain the cationic filler. The mass ratio of the barite powder to the water glass to the cationic soap powder is 1:0.4:0.3.
wherein, the mole ratio of the 3-aminopropyl triethoxysilane, the N, N-dimethyl oxalic acid and the dimethyl sulfate is 1:1.2:1.1.
the embodiment also provides a functional fiber in the preparation process of the environment-friendly recycled paper, the addition amount of the functional fiber is 8% of the mass of the pretreated waste paper raw material, and the preparation method comprises the following steps:
A. carrying out polyaddition reaction on 3, 4-epoxy-1-butene and isopentenol under the action of an initiator (diisopropyl peroxydicarbonate, the addition amount of which is 0.4% of the mass of the reaction raw materials), wherein the reaction temperature is 80 ℃ and the reaction time is 6 hours, so as to obtain a polyaddition product;
B. according to the mass ratio of 1:35 dissolving sodium alginate in water, then adjusting the pH value to 9.5 by using sodium hydroxide, then adding the polyaddition product obtained in the step A, stirring at 65 ℃ for reaction for 3 hours, and then precipitating by using absolute ethyl alcohol to obtain modified sodium alginate;
C. and uniformly mixing the modified sodium alginate with water, adding sepiolite fibers, stirring and adsorbing for 2 hours, slowly introducing into a calcium chloride solution, standing for 40 minutes, filtering out liquid, washing with water, and drying to obtain the functional fibers. The mass ratio of the modified sodium alginate to the water to the sepiolite fiber is 1:40:40, the mole ratio of the modified sodium alginate to the calcium chloride is 1:1.
wherein, the mole ratio of 3, 4-epoxy-1-butene, isopentenol and sodium alginate is 1:1:3.
the invention also provides the anionic starch in the preparation process of the environment-friendly regenerated paper, the addition amount of the anionic starch is 5% of the mass of the pretreated waste paper raw material, and the preparation method comprises the following steps:
according to the mole ratio of 1:1.2, carrying out polyaddition reaction on sodium acrylate and dodecenyl succinic acid under the initiation condition of potassium persulfate (the addition amount is 0.2% of the total mass of the reaction raw materials), uniformly mixing the obtained product with starch and sodium carbonate, introducing the mixture into a ball mill for reaction for 3 hours at the temperature of 70 ℃, washing the obtained product with 90% ethanol, and then drying to obtain the anionic starch.
Wherein, the mass ratio of the starch, sodium carbonate and the product obtained by the polyaddition reaction is 1:0.07:1.
the remainder was the same as in example 4.
Comparative example 1
The difference between this comparative example and example 4 is that the cationic filler is talc treated with a quaternary ammonium cationic surfactant.
Comparative example 2
The difference between this comparative example and example 4 is that the cationic filler is soapstone powder treated with a quaternary ammonium cationic surfactant.
Comparative example 3
The difference between this comparative example and example 4 is that the cationic filler is barite powder treated with a quaternary ammonium cationic surfactant.
Comparative example 4
The present comparative example differs from example 4 in that the cationic filler is cationic saponite powder prepared by the method of example 4.
Comparative example 5
The comparative example differs from example 4 in that the cationic filler is changed to a filler containing no cations, and the preparation method is as follows: and (3) drying the barite powder, spraying water glass on the surface of the barite powder, spraying nano soap powder on the surface of the water glass, and curing at normal temperature to obtain the filler.
Comparative example 6
The difference between this comparative example and example 5 is that the functional fiber is alginate fiber, which is extruded directly through a spinneret orifice into a coagulation bath of calcium chloride solution through a sodium alginate solution to form a solid fiber tow.
Comparative example 7
The present comparative example differs from example 5 in that the functional fiber is sepiolite fiber.
Comparative example 8
The present comparative example differs from example 5 in that the functional fiber was added at the beginning of the pulping in step (2).
Comparative example 9
The difference between this comparative example and example 5 is that the functional fiber does not contain sepiolite fiber, and the preparation method step C is: mixing the modified sodium alginate with water uniformly, sucking the solution by a syringe, spraying the solution into a coagulating bath of 30 ℃ calcium chloride solution, standing for 35min, filtering out liquid, washing with water, and drying to obtain the functional fiber.
Comparative example 10
The difference between this comparative example and example 5 is that the preparation method of the functional fiber comprises the following steps: and (3) carrying out polyaddition reaction on 3, 4-epoxy-1-butene under the action of an initiator, wherein the reaction temperature is 70 ℃, and the reaction time is 5 hours, so as to obtain a polyaddition product.
Comparative example 11
This comparative example differs from example 6 in that the anionic starch is changed to ordinary starch.
Comparative example 12
This comparative example differs from example 6 in that the anionic starch is changed to a common sulfonate anionic surfactant.
Comparative example 13
This comparative example differs from example 6 in that the anionic starch is changed to a common carboxylate anionic surfactant.
1. Control of stickies in the slurry obtained by the pulping process
The adhesive content in the pulp obtained after the pulping process of examples 1 to 6 and comparative examples 1 to 5 of the present invention was measured by an area method, and the adhesive deposition on the forming wire and press felt in the subsequent papermaking process was observed, and the results are shown in table 3.
The specific detection method comprises the following steps: the paper pulp materials obtained by pulping processes in different examples and comparative examples are taken, uniformly stirred, made into paper with the same quantitative, spread the paper sheet after sheet making, uniformly brush a layer of ink to make the paper surface black, place a piece of release paper on the paper sheet after ink coating, then place between a smooth pressing plate and a pressing block, dry for 10min in a drying oven at 100 ℃, immediately take out the pressing plate, the pressing block and the release paper, brush white aluminum oxide powder over the black area, be stuck in places with adhesive, and the powder in non-stick places can be directly brushed off by a brush. And (3) placing release paper on the surface of the brushed paper, placing the release paper between a smooth pressing plate and a pressing block, drying the release paper in a drying oven at 110 ℃ for 15min, taking out the pressing plate and the pressing block, and brushing redundant powder.
And (3) scanning an image of a black part on the paper by using an SEM scanning electron microscope, calculating the black area by using image analysis software, and recording the value of the adhesive area, wherein the adhesive content is = (adhesive area/measurement area) multiplied by 100%.
TABLE 1
As can be seen from the results of Table 1, the paper stock of examples 2 to 6 of the present invention has a lower stickies content of only 2.04 to 2.10 cm compared to the conventional papermaking process of example 1 2 /m 2 No obvious adhesive deposit exists on the forming wire and the press felt, which indicates that the cationic filler can obviously reduce the adhesive content after the cationic filler is added into the treated waste paper.
Comparative examples 1 to 5, compared with example 4, changed the raw material composition and the preparation method of the cationic filler, respectively, as a result of which the content of stickies was significantly increased, and a small or medium amount of stickies deposition also occurred on the forming wire and the press felt.
2. The basic performance of the environment-friendly recycled paper prepared by the invention
The paper properties of the recycled papers prepared in examples 1 to 6 and comparative examples 6 to 13 of the present invention were tested with reference to the corresponding national standards, and the results are shown in Table 2.
TABLE 2
As is clear from Table 2, compared with the conventional papermaking process of example 1, the paper properties such as folding endurance, tearing strength, tensile index, bursting strength and the like of the recycled paper prepared in examples 4 to 6 of the present invention are significantly improved, which indicates that the present invention can obtain recycled paper with excellent quality.
In example 2, the paper properties were slightly improved after pretreatment of the waste paper raw material with the cationic filler, compared with example 1; on the basis of example 2, after the functional fiber is added in example 3, the dispersion of the functional fiber is influenced by residual cationic filler in the system, so that the improvement of the paper performance is not obvious. On the basis of example 3, the problem of dispersibility of functional fibers is solved after the anionic starch is introduced in example 4, so that the performance of the paper is obviously improved.
Comparative examples 6 to 10 respectively changed the preparation raw materials, the preparation methods and the addition processes of the functional fiber as compared with example 5; comparative examples 11 to 13 each changed the type of anions as compared with example 6. As a result, the paper properties of comparative examples 6 to 13 were lowered to different extents.
The invention has the beneficial effects that: according to the preparation process of the environment-friendly recycled paper, provided by the invention, the cationic filler is adopted to pretreat the waste paper raw material, and the functional fiber and the anionic starch are added in the papermaking process, so that the adhesive in the waste paper can be effectively removed, and the product quality of the recycled paper is comprehensively improved.
Finally, it should be noted that the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited to the above-mentioned embodiment, but may be modified or some of the technical features thereof may be replaced by other technical solutions described in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The preparation process of the environment-friendly recycled paper is characterized by comprising the following steps of: the method comprises the following steps:
(1) Pretreatment of waste paper raw materials: placing the waste paper raw material into a fluidized bed to remove free impurities, cutting the waste paper, humidifying the waste paper by adopting an ethanol solution, then entering an airflow stirrer, and adding a cationic filler to remove adhesive impurities;
(2) Pulping: inputting the pretreated waste paper raw materials into a pulper, pulping, deinking, screening and purifying, discharging impurities, and enabling the obtained pulp to enter a pulp storage tank;
(3) Papermaking: pulping, pulp mixing, net part pressing, drying, surface sizing, drying and calendaring to obtain a finished product;
the preparation method of the cationic filler comprises the following steps:
s1, uniformly mixing 3-aminopropyl triethoxysilane, acetic acid and water, stirring for 30-60 min to obtain a hydrolysis solution, drying nano soap stone powder, heating to 100-110 ℃, adding the hydrolysis solution in an atomized form, and stirring for reaction for 3-5 h;
s2, adding toluene into the material obtained in the step S2, then adding N, N-dimethyl oxalic acid, stirring at 120-130 ℃ for reaction for 4-5 hours, adding isopropanol into the product after the toluene is distilled off under reduced pressure, then dropwise adding dimethyl sulfate, reacting at 80-85 ℃ for 1-3 hours, and distilling off the isopropanol under reduced pressure to obtain cationic soap powder;
s3, spraying water glass on the surface of the dried barite powder, spraying cationic soap powder on the surface of the water glass, and curing at normal temperature to obtain cationic filler;
the addition amount of the cationic filler is 4-10% of the mass of the humidified waste paper, and the molar ratio of the 3-aminopropyl triethoxysilane to the N, N-dimethyl oxalic acid to the dimethyl sulfate is 1: (1-1.2): (1-1.1);
in the step S1, the mass ratio of the 3-aminopropyl triethoxysilane to the acetic acid to the water is 1: (0.1-0.2): (0.3-0.8), the mass ratio of the 3-aminopropyl triethoxysilane to the nano soap powder is (0.5-1.5): 100;
in the step S3, the mass ratio of the barite powder to the water glass to the cationic soap powder is 1: (0.2-0.4): (0.1-0.3).
2. The process for preparing environment-friendly recycled paper according to claim 1, which is characterized in that: the regenerated paper also comprises functional fibers, the functional fibers are added during the pulp mixing in the step (3), and the preparation method comprises the following steps:
A. carrying out polyaddition reaction on 3, 4-epoxy-1-butene and isopentenol under the action of an initiator, wherein the reaction temperature is 60-80 ℃ and the reaction time is 4-6 h, so as to obtain a polyaddition product;
B. dissolving sodium alginate in water, then adjusting the pH value to 9-9.5 by sodium hydroxide, adding the polyaddition product obtained in the step A, stirring at 55-65 ℃ for reacting for 2-3 h, and separating out by using absolute ethyl alcohol to obtain modified sodium alginate;
C. uniformly mixing the modified sodium alginate with water, adding sepiolite fibers, stirring and adsorbing for 1-2 h, slowly introducing into a calcium chloride solution, standing for 30-40 min, filtering out liquid, washing with water, and drying to obtain the functional fibers.
3. The process for preparing environment-friendly recycled paper according to claim 2, which is characterized in that: the addition amount of the functional fiber is 3-8% of the mass of the pretreated waste paper raw material, and the mole ratio of the 3, 4-epoxy-1-butene, the isopentenol and the sodium alginate is 1: (0.4-1): (1-3).
4. The process for preparing environment-friendly recycled paper according to claim 2, which is characterized in that: in the step A, the initiator is benzoyl peroxide/N, N-dimethylaniline, azodiisoheptonitrile or diisopropyl peroxydicarbonate, and the addition amount of the initiator is 0.2-0.4% of the mass of the reaction raw materials.
5. The process for preparing environment-friendly recycled paper according to claim 2, which is characterized in that: in the step B, the mass ratio of sodium alginate to water is 1: (25-35); in the step C, the mass ratio of the modified sodium alginate to the water to the sepiolite fiber is 1: (20-40): (18-40), the mole ratio of the modified sodium alginate to the calcium chloride is 1: (0.5-1).
6. The process for preparing environment-friendly recycled paper according to claim 1, which is characterized in that: the regenerated paper also comprises anionic starch, wherein the anionic starch is added in the step (3) of pulping, and the preparation method of the anionic starch comprises the following steps:
and (3) carrying out polyaddition reaction on sodium acrylate and dodecenyl succinic acid under the condition of triggering potassium persulfate, uniformly mixing the obtained product with starch and sodium carbonate, introducing the mixture into a ball mill for reaction for 2-3 h at the temperature of 60-70 ℃, washing the obtained product with 90% ethanol, and then drying to obtain the anionic starch.
7. The process for preparing environment-friendly recycled paper according to claim 6, wherein the process comprises the following steps: the addition amount of the anionic starch is 2-5% of the mass of the pretreated waste paper raw material, and the molar ratio of the sodium acrylate to the dodecenyl succinic anhydride is 1: (1-1.2), wherein the addition amount of the potassium persulfate is 0.1-0.2% of the total mass of the reaction raw materials; the mass ratio of starch, sodium carbonate and the product obtained by the polyaddition reaction is 1: (0.05-0.07): (0.6-1).
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