CN111235965A - Processing technology for reducing loss rate of paper pulp fibers in papermaking technology - Google Patents
Processing technology for reducing loss rate of paper pulp fibers in papermaking technology Download PDFInfo
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- CN111235965A CN111235965A CN202010160018.3A CN202010160018A CN111235965A CN 111235965 A CN111235965 A CN 111235965A CN 202010160018 A CN202010160018 A CN 202010160018A CN 111235965 A CN111235965 A CN 111235965A
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- 239000000835 fiber Substances 0.000 title claims abstract description 138
- 229920001131 Pulp (paper) Polymers 0.000 title claims abstract description 62
- 238000005516 engineering process Methods 0.000 title claims abstract description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 54
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 46
- 238000001035 drying Methods 0.000 claims abstract description 37
- 239000002105 nanoparticle Substances 0.000 claims abstract description 28
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000001914 filtration Methods 0.000 claims abstract description 21
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 12
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000007865 diluting Methods 0.000 claims abstract description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 29
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 18
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000012153 distilled water Substances 0.000 claims description 11
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 9
- JBIROUFYLSSYDX-UHFFFAOYSA-M benzododecinium chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 JBIROUFYLSSYDX-UHFFFAOYSA-M 0.000 claims description 8
- 230000007935 neutral effect Effects 0.000 claims description 8
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- 238000000967 suction filtration Methods 0.000 claims description 6
- 238000007605 air drying Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000008213 purified water Substances 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 4
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims 1
- 238000009775 high-speed stirring Methods 0.000 claims 1
- 238000001291 vacuum drying Methods 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 3
- 239000011229 interlayer Substances 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 230000003746 surface roughness Effects 0.000 abstract description 2
- 239000000123 paper Substances 0.000 description 15
- 239000010410 layer Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 238000001354 calcination Methods 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 238000000643 oven drying Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- -1 ammonium ions Chemical class 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000011105 molded pulp Substances 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 150000002892 organic cations Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000005588 protonation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/44—Products obtained from layered base-exchange silicates by ion-exchange with organic compounds such as ammonium, phosphonium or sulfonium compounds or by intercalation of organic compounds, e.g. organoclay material
-
- 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
-
- 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
-
- 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
- D21H21/50—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 form
- D21H21/52—Additives of definite length or shape
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- General Physics & Mathematics (AREA)
- Composite Materials (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
Abstract
The invention discloses a processing technology for reducing the loss rate of paper pulp fibers in a papermaking technology, which relates to the technical field of paper pulp fiber treatment, and specifically comprises the following steps: 1) pretreating the paper pulp fibers; 2) introducing ethylenediamine to the surface of the silicon dioxide nano-particles to obtain pretreated silicon dioxide nano-particles; 3) carrying out interlayer spacing expansion treatment on the nano-montmorillonite to obtain pretreated nano-montmorillonite; 4) preparing a paper pulp fiber treatment solution; 5) diluting the pretreated paper pulp fiber, adding the paper pulp fiber treatment solution, stirring at a high speed, grouting, suction filtering, and squeezing and drying to obtain the paper pulp fiber meeting the requirements. The processing technology can reduce the loss of the fine fibers in the dewatering process of the paper pulp, reduce the loss rate of the fibers, and avoid the technical defects of uneven dispersion of the fine fibers in the paper pulp and increased surface roughness of the paper pulp fibers in the prior art, so that the produced paper has high quality and excellent physical and chemical properties.
Description
Technical Field
The invention belongs to the technical field of paper pulp fiber treatment, and particularly relates to a processing technology for reducing the loss rate of paper pulp fibers in a papermaking technology.
Background
The stock used in papermaking is a complex, heterogeneous compound of fibres, fines, fillers and other additives, all of which have constantly changing properties, which can cause confusion during processing, and it is further complicated that the major part of the papermaking stock is not turned into paper when it is first conveyed through the line, but that the stock is dewatered on the forming wire, which results in the fines being lost through the wire along with the water, and thus low retention of fines in the pulp.
The fiber is an essential element for forming the paper, the paper is actually an assembly formed by interweaving the fiber, and a plurality of physical properties of the paper are represented by the functionality of the assembly formed by interweaving the fiber. Therefore, the performance of the paper can be effectively ensured by reducing the loss rate of the paper fiber, and the papermaking cost can also be effectively reduced. Therefore, how to control the reduction of the fiber amount of the paper, improve the physical properties of the paper and enhance the product quality is one of the technical problems faced by the paper industry at present. For example, chinese patent 2012105835164 discloses a method for increasing retention of molded pulp fibers, which comprises adding cationic polyacrylamide into pulp, pre-flocculating with the pulp fibers with polyacrylamide to form larger flocs, so that fine fibers in the pulp are not easily washed away by flowing water, thereby increasing retention of the pulp fibers, but the fine fibers in the pulp fibers are agglomerated to form a large amount of flocs, thereby reducing the uniformity of dispersion of the fine fibers in the pulp, and further causing technical defects that the performance and strength of the paper are difficult to control, so that the paper produced is smooth and flexible, and is easy to break, have holes and easily get powder; for example, chinese patent 2005100269254 discloses a calcium carbonate-coated pulp fiber, a method for preparing the same, and an application thereof in papermaking, wherein calcium carbonate is coated on the surface of the pulp fiber as a filler, thereby increasing the bonding force between the filler and the paper fiber, thereby reducing the loss of fine fibers and improving the quality of paper.
Disclosure of Invention
The invention aims to provide a processing technology for reducing the loss rate of paper pulp fibers in a papermaking technology aiming at the existing problems.
The invention is realized by the following technical scheme:
a processing technology for reducing the loss rate of paper pulp fibers in a papermaking technology comprises the following specific processing technologies:
1) filtering the pulp fiber to remove moisture, placing the pulp fiber in a forced air drying box, completely drying the pulp fiber at the temperature of 100-110 ℃, then placing the dried pulp fiber in a storage type liquid nitrogen container for processing for 1-3h, taking out the processed pulp fiber, and balancing for 20-30h at the room temperature with the relative humidity of 60-70 percent to obtain the pretreated pulp fiber; according to the invention, the ultralow temperature treatment is carried out on the pulp fiber by using liquid nitrogen, so that the crystallinity of the fiber is reduced, the amorphous area is increased, and the molecular hydrogen bond acting force of the amorphous area of the pulp fiber is weak, so that the gaps of fiber molecules are increased, the density of the pulp fiber is reduced, and the filling of inorganic nanoparticles in the pores of the pulp fiber in the subsequent treatment process is facilitated;
2) adding 10-15 parts of silane coupling agent and 3-7 parts of ethylenediamine into 300 parts of 200-90 ℃ methanol solution, reacting for 20-25h at 80-90 ℃ in nitrogen atmosphere, filtering, concentrating the obtained solution to 1/3-1/2 of the original volume for later use, dispersing the dendritic porous silica nanoparticles into toluene solution according to the mass-to-volume ratio of 1:10-15g/ml, adding the prepared concentrated solution, reacting for 20-30h at 105-115 ℃, extracting and washing with methanol after the reaction is finished, and drying in vacuum at 60-70 ℃ to obtain pretreated silica nanoparticles; according to the invention, through the action of a silane coupling agent, ethylenediamine is grafted to the surface of the silicon dioxide nano-particles, so that amino groups are introduced to the surface of the silicon dioxide nano-particles;
3) adding sodium-based montmorillonite into distilled water according to the mass-volume ratio of 1:20-30g/ml, performing ultrasonic dispersion for 20-30min under the condition of 500W of 300-500W, centrifuging and drying the upper-layer suspension, placing the upper-layer suspension in a muffle furnace for high-temperature roasting at the temperature of 500-600 ℃ for 1-2h, then dispersing the upper-layer suspension in 1-1.5mol/L hydrochloric acid solution under the same ultrasonic power, continuously stirring for 5-8h at the rotating speed of 200r/min at the temperature of 70-80 ℃ under the nitrogen atmosphere, filtering and washing to be neutral, drying to obtain purified nano-montmorillonite, then uniformly stirring the purified nano-montmorillonite and distilled water according to the mass-volume ratio of 1:5-10g/ml, heating to 80-90 ℃, adding dodecyl dimethyl benzyl ammonium chloride with the mass of 3-5% of the nano-based montmorillonite, reacting for 5-8h, standing for 20-30h after the reaction is finished, drying at 70-80 ℃ after filtering, and grinding and refining to obtain pretreated nano-montmorillonite with the average particle size of 10-20 um; in the invention, purified nano-montmorillonite is reacted with dodecyl dimethyl benzyl ammonium chloride, because the nano-montmorillonite is a silicate with a layered structure and exchangeable cations are arranged among layers, organic cations in the dodecyl dimethyl benzyl ammonium chloride can be embedded into the interlayer of the nano-montmorillonite through ion exchange reaction, so that the interlayer spacing is increased, and the insertion amount of pretreated silicon dioxide nanoparticles among the nano-montmorillonite layers in the subsequent process is favorably improved;
4) adding the obtained pretreated nano-montmorillonite into deionized water according to the mass-to-volume ratio of 1:40-50g/ml, stirring for 20-30min at 300r/min under 200-; in the invention, N atoms carried on ethylene diamine molecular chains introduced into the surfaces of pretreated silicon dioxide nano particles are in a protonation state under an acidic condition to form ammonium ions with positive charges, so that sodium ions between pretreated nano montmorillonite layers can be replaced and tight adsorption is formed, the pretreated silicon dioxide nano particles can be well inserted between the pretreated nano montmorillonite layers, and adjacent layers can be firmly adsorbed together by virtue of multipoint adsorption between the pretreated silicon dioxide nano particles and the pretreated nano montmorillonite layers, so that the hydration of the inner surfaces of the nano montmorillonite can be inhibited, the stability of the size of the nano montmorillonite is improved, the hydration expansion of suspended matters in the prepared paper pulp fiber treatment liquid is prevented, and the stability of the treatment liquid can be improved;
5) diluting the pretreated paper pulp fiber into paper pulp fiber with the mass concentration of 1-3% by adopting purified water, then adding paper pulp fiber treatment liquid into the paper pulp fiber according to 20-35% of the mass of the diluted paper pulp fiber, stirring for 2-5min at the speed of 1000 plus 1300r/min, injecting the obtained mixture into a paper pulp molding device, performing a grouting procedure for 5-8s and a suction filtration procedure for 25-35s, then squeezing the paper pulp fiber under the pressure of 4-6MPa, taking out, drying for 15-20min at the temperature of 70-90 ℃, and performing alternate squeezing-drying treatment for 4-5 times to obtain the paper pulp fiber meeting the requirements; according to the invention, the fiber treatment liquid is added into the pulp fibers for stirring treatment, solid suspended matters in the treatment liquid can be well filled in gaps of the pulp fibers, and dendritic porous silica nanoparticles are embedded in the suspended matters, so that raised multi-level dendritic antennae are formed on the surfaces of the suspended matters, and the formed antennae can well hook the pulp fibers and are fixed, so that the spiny ball-shaped suspended matters with the dendritic antennae are distributed and fixed at pores of the pulp fibers, and the fixed distributed spiny ball-shaped suspended matters can be utilized to enable the fibers to be hooked with each other through the protruded antennae of the suspended matters when the pulp is dewatered, thereby reducing the loss of fine fibers in the pulp dewatering process; by alternately carrying out squeezing and drying, the crystallinity of the paper pulp fiber can be improved, so that the damage to the crystallinity of the paper pulp fiber in the prior process can be compensated, and the quality of the paper which is made can meet the requirement.
Compared with the prior art, the invention has the following advantages:
according to the processing technology provided by the invention, the 'thorn ball' -shaped suspended particles with the 'tree-shaped tentacles' are embedded into the pores of the pulp fibers, and the 'tentacles' of the suspended particles and the 'tentacles' and the fibers can be hooked with each other, so that the fibers in the pulp can be fixed, the loss of fine fibers under the action of water flow scouring in the dewatering process of the pulp can be reduced, the fiber loss rate is effectively reduced, the technical defects that the fine fibers are not uniformly dispersed in the pulp and the surface roughness of the pulp fibers is increased in the prior art can be avoided, and the produced paper is high in quality and excellent in physical and chemical properties.
Detailed Description
The present invention will be further described with reference to specific embodiments.
Example 1
A processing technology for reducing the loss rate of paper pulp fibers in a papermaking technology comprises the following specific processing technologies:
1) filtering paper pulp fibers to remove moisture, placing the paper pulp fibers in a forced air drying oven, completely drying the paper pulp fibers at 100 ℃, then placing the dried paper pulp fibers in a storage type liquid nitrogen container, treating for 1h, taking out the treated paper pulp fibers, and balancing for 30h at room temperature with relative humidity of 60% to obtain pretreated paper pulp fibers;
2) adding 10 parts of silane coupling agent and 3 parts of ethylenediamine into 200 parts of methanol solution, reacting for 25 hours at 80 ℃ in the nitrogen atmosphere, filtering, concentrating the obtained solution to 1/3 of the original volume for later use, dispersing dendritic porous silica nanoparticles into toluene solution according to the mass-to-volume ratio of 1:10g/ml, adding the prepared concentrated solution, reacting for 30 hours at 105 ℃, after the reaction is finished, extracting and washing with methanol, and drying in vacuum at 60 ℃ to obtain pretreated silica nanoparticles;
3) adding sodium-based montmorillonite into distilled water according to the mass-to-volume ratio of 1:20g/ml, ultrasonic dispersing at 300W for 30min, centrifuging the upper suspension, oven drying, calcining at 500 deg.C in muffle furnace for 2 hr, then dispersing the nano montmorillonite in 1mol/L hydrochloric acid solution under the same ultrasonic power, continuously stirring for 8h at the rotating speed of 150r/min at 70 ℃ under the atmosphere of nitrogen, filtering, washing to be neutral, drying to obtain purified nano montmorillonite, then according to the mass-to-volume ratio of 1:5g/ml, uniformly stirring purified nano-montmorillonite and distilled water, heating to 80 ℃, adding dodecyl dimethyl benzyl ammonium chloride accounting for 3% of the mass of the nano-montmorillonite, reacting for 8 hours, standing for 30 hours after the reaction is finished, drying at 70 ℃ after filtering, and grinding and refining to obtain pretreated nano-montmorillonite with the average particle size of 10 um;
4) adding the obtained pretreated nano montmorillonite into deionized water according to the mass-to-volume ratio of 1:40g/ml, stirring for 30min at 200r/min, standing for 20h, adding pretreated silica nanoparticles accounting for 10% of the mass of the pretreated nano montmorillonite, adjusting the pH to 3 by using 0.1mol/L hydrochloric acid solution, stirring at a high speed of 700r/min for 40min, standing for 20h, centrifuging at 6000r/min for 25min, taking the lower precipitate, washing to be neutral, drying, dispersing in the deionized water, and preparing into 13% pulp fiber treatment liquid;
5) diluting the pretreated paper pulp fiber into paper pulp fiber with the mass concentration of 1% by adopting purified water, then adding paper pulp fiber treatment liquid into the paper pulp fiber according to 20% of the mass of the diluted paper pulp fiber, stirring for 5min at 1000r/min, injecting the obtained mixture into a paper pulp molding device, performing a grouting procedure for 5s and a suction filtration procedure for 25s, then squeezing the paper pulp fiber under the pressure of 4MPa, taking out, drying for 20min at 70 ℃, and performing alternate squeezing-drying treatment for 4 times to obtain the paper pulp fiber meeting the requirements.
Compared with the pulp fiber treated in the example 1 in the Chinese patent 2012105835164, the pulp fiber treated by the processing technology provided by the embodiment has the advantage that the loss rate of the fines can be reduced by 5.4% through papermaking and dehydration.
Example 2
A processing technology for reducing the loss rate of paper pulp fibers in a papermaking technology comprises the following specific processing technologies:
1) filtering the pulp fibers to remove moisture, placing the pulp fibers in a forced air drying oven, completely drying the pulp fibers at 105 ℃, then placing the dried pulp fibers in a storage type liquid nitrogen container for treatment for 2 hours, taking out the treated pulp fibers, and balancing the pulp fibers for 25 hours at room temperature with relative humidity of 65% to obtain pretreated pulp fibers;
2) adding 13 parts of silane coupling agent and 5 parts of ethylenediamine into 250 parts of methanol solution, reacting at 85 ℃ for 23 hours in the nitrogen atmosphere, filtering, concentrating the obtained solution to 1/3 of the original volume for later use, dispersing dendritic porous silica nanoparticles into toluene solution according to the mass-to-volume ratio of 1:12g/ml, adding the prepared concentrated solution, reacting at 110 ℃ for 25 hours, after the reaction is finished, extracting and washing with methanol, and drying at 65 ℃ in vacuum to obtain pretreated silica nanoparticles;
3) adding sodium-based montmorillonite into distilled water according to the mass-to-volume ratio of 1:25g/ml, ultrasonic dispersing at 400W for 25min, centrifuging the upper suspension, oven drying, calcining at 550 deg.C in muffle furnace for 1.5 hr, then the mixture is dispersed in 1.1mol/L hydrochloric acid solution under the same ultrasonic power, continuously stirring for 7h at 75 ℃ and the rotating speed of 180r/min under the nitrogen atmosphere, filtering, washing to be neutral, drying to obtain purified nano-montmorillonite, then according to the mass-to-volume ratio of 1:8g/ml, uniformly stirring purified nano-montmorillonite and distilled water, heating to 85 ℃, adding dodecyl dimethyl benzyl ammonium chloride accounting for 4% of the mass of the nano-montmorillonite, reacting for 6 hours, standing for 26 hours after the reaction is finished, drying at 75 ℃ after filtering, and grinding and refining to obtain pretreated nano-montmorillonite with the average particle size of 15 um;
4) adding the obtained pretreated nano montmorillonite into deionized water according to the mass-to-volume ratio of 1:45g/ml, stirring for 25min at 250r/min, standing for 23h, adding pretreated silicon dioxide nano particles accounting for 12% of the mass of the pretreated nano montmorillonite, adjusting the pH to 3.5 by using 0.2mol/L hydrochloric acid solution, stirring at high speed for 35min at 800r/min, standing for 24h, centrifuging for 20min at 7000r/min, taking the lower precipitate, washing to be neutral, drying, dispersing in deionized water, and preparing into 15% pulp fiber treatment liquid;
5) diluting the pretreated paper pulp fibers into paper pulp fibers with the mass concentration of 2% by adopting purified water, adding paper pulp fiber treatment liquid into the paper pulp fibers according to 30% of the mass of the diluted paper pulp fibers, stirring for 3min at 1200r/min, injecting the obtained mixture into a paper pulp molding device, performing a grouting procedure for 7s and a suction filtration procedure for 30s, then squeezing the paper pulp fibers under the pressure of 5MPa, taking out, drying for 17min at 80 ℃, and performing alternate squeezing-drying treatment for 4 times to obtain the paper pulp fibers meeting the requirements.
Compared with the pulp fiber treated in the example 1 in the Chinese patent 2012105835164, the pulp fiber treated by the processing technology provided by the embodiment has the advantage that the loss rate of the fines can be reduced by 5.3% through papermaking and dehydration.
Example 3
A processing technology for reducing the loss rate of paper pulp fibers in a papermaking technology comprises the following specific processing technologies:
1) filtering the pulp fibers to remove moisture, placing the pulp fibers in a forced air drying oven, completely drying the pulp fibers at 110 ℃, then placing the dried pulp fibers in a storage type liquid nitrogen container for treatment for 3 hours, taking out the treated pulp fibers, and balancing the pulp fibers for 20 hours at room temperature with relative humidity of 70% to obtain pretreated pulp fibers;
2) adding 15 parts of silane coupling agent and 7 parts of ethylenediamine into 300 parts of methanol solution, reacting for 20 hours at 90 ℃ in the nitrogen atmosphere, filtering, concentrating the obtained solution to 1/2 of the original volume for later use, dispersing dendritic porous silica nanoparticles into toluene solution according to the mass-to-volume ratio of 1:15g/ml, adding the prepared concentrated solution, reacting for 20 hours at 115 ℃, after the reaction is finished, extracting and washing with methanol, and drying in vacuum at 70 ℃ to obtain pretreated silica nanoparticles;
3) adding sodium-based montmorillonite into distilled water according to the mass-to-volume ratio of 1:30g/ml, ultrasonic dispersing at 500W for 20min, centrifuging the upper suspension, oven drying, calcining at 600 deg.C in muffle furnace for 1 hr, then the mixture is dispersed in 1.5mol/L hydrochloric acid solution under the same ultrasonic power, continuously stirring for 5h at 80 ℃ under nitrogen atmosphere at the rotating speed of 200r/min, filtering, washing to be neutral, drying to obtain purified nano-montmorillonite, then according to the mass-to-volume ratio of 1:10g/ml, uniformly stirring purified nano-montmorillonite and distilled water, heating to 90 ℃, adding dodecyl dimethyl benzyl ammonium chloride accounting for 5% of the mass of the nano-montmorillonite, reacting for 5 hours, standing for 30 hours after the reaction is finished, drying at 80 ℃ after filtering, and grinding and refining to obtain pretreated nano-montmorillonite with the average particle size of 20 um;
4) adding the obtained pretreated nano-montmorillonite into deionized water according to the mass-to-volume ratio of 1:50g/ml, stirring at 300r/min for 20min, standing for 30h, adding pretreated silica nanoparticles accounting for 15% of the mass of the pretreated nano-montmorillonite, adjusting the pH value to 4 by using 0.3mol/L hydrochloric acid solution, stirring at high speed at 900r/min for 30min, standing for 30h, centrifuging at 8000r/min for 15min, taking the lower precipitate, washing to be neutral, drying, dispersing in deionized water, and preparing into 18% pulp fiber treatment liquid;
5) diluting the pretreated paper pulp fiber into paper pulp fiber with the mass concentration of 3% by adopting purified water, then adding paper pulp fiber treatment liquid into the paper pulp fiber according to 35% of the mass of the diluted paper pulp fiber, stirring for 2min at 1300r/min, injecting the obtained mixture into a paper pulp molding device, performing a grouting procedure for 8s and a suction filtration procedure for 35s, then squeezing the paper pulp fiber under the pressure of 6MPa, taking out, drying for 15min at 90 ℃, and performing alternate squeezing-drying treatment for 5 times to obtain the paper pulp fiber meeting the requirements.
Compared with the pulp fiber treated in the example 1 in the Chinese patent 2012105835164, the pulp fiber treated by the processing technology provided by the embodiment has the advantage that the loss rate of the fines can be reduced by 5.6 percent through papermaking and dehydration.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention.
Claims (7)
1. A processing technology for reducing the loss rate of paper pulp fibers in a papermaking technology is characterized by comprising the following specific processing technologies:
1) filtering the pulp fiber to remove moisture, placing the pulp fiber in a forced air drying box, completely drying the pulp fiber at the temperature of 100-110 ℃, then placing the dried pulp fiber in a storage type liquid nitrogen container for processing for 1-3h, taking out the processed pulp fiber, and balancing for 20-30h at the room temperature with the relative humidity of 60-70 percent to obtain the pretreated pulp fiber;
2) adding a proper amount of silane coupling agent and ethylenediamine into a methanol solution, reacting for 20-25h at 80-90 ℃ in a nitrogen atmosphere, filtering, concentrating the obtained solution for later use, dispersing silicon dioxide nanoparticles into a toluene solution, adding the prepared concentrated solution, reacting for 20-30h at 105-115 ℃, extracting and washing with methanol after the reaction is finished, and drying in vacuum to obtain pretreated silicon dioxide nanoparticles;
3) uniformly stirring purified nano-montmorillonite with a proper amount of distilled water, heating to 80-90 ℃, adding a certain amount of dodecyl dimethyl benzyl ammonium chloride, reacting for 5-8h, standing for 20-30h after the reaction is finished, filtering, drying at 70-80 ℃, grinding and refining to obtain pretreated nano-montmorillonite;
4) adding the obtained pretreated nano-montmorillonite into deionized water, stirring for 20-30min, standing for 20-30h, adding a proper amount of pretreated silicon dioxide nanoparticles, adjusting the pH to 3-4, stirring at a high speed for 30-40min, standing for 20-30h, centrifuging for 15-25min at 6000-8000r/min, taking the lower precipitate, washing to neutrality, drying, dispersing in deionized water, and preparing into a paper pulp fiber treatment solution;
5) diluting the pretreated pulp fiber into pulp fiber with mass concentration of 1-3% by adopting purified water, then adding the pulp fiber treatment solution into the diluted pulp fiber, stirring for 2-5min at the speed of 1000-.
2. The process of claim 1, wherein in step 2), the volume ratio of the silane coupling agent to the ethylenediamine to the methanol solution is 10-15:3-7: 200-; the solution concentration is to concentrate the filtered solution to 1/3-1/2 of the original volume.
3. The process according to claim 1, wherein in step 2), the silica nanoparticles are dendritic porous silica nanoparticles, and the mass-to-volume ratio of the dendritic porous silica nanoparticles to the toluene solution is 1:10-15 g/ml; the temperature of the vacuum drying is 60-70 ℃.
4. The process of claim 1, wherein in step 3), the purified nanomontmorillonite is prepared by the following steps: adding sodium montmorillonite into distilled water according to the mass-to-volume ratio of 1:20-30g/ml, performing ultrasonic dispersion for 20-30min under the condition of 500W of 300-minus, centrifuging and drying the upper layer suspension, placing the upper layer suspension in a muffle furnace for high-temperature roasting at the temperature of 500-minus for 1-2h, then dispersing the upper layer suspension in 1-1.5mol/L hydrochloric acid solution under the same ultrasonic power, continuously stirring for 5-8h at the rotating speed of 200r/min at the temperature of 70-80 ℃ under the nitrogen atmosphere, filtering, washing to be neutral, and drying to obtain the purified nano montmorillonite.
5. The process of claim 1, wherein in step 3), the mass-to-volume ratio of the nanomontmorillonite to distilled water is 1:5-10 g/ml; the addition amount of the dodecyl dimethyl benzyl ammonium chloride is 3-5% of the mass of the nano-montmorillonite; the granularity of the pretreated nano-montmorillonite after grinding and refining is 10-20 um.
6. The process of claim 1, wherein in step 4), the mass-to-volume ratio of the pretreated nanomontmorillonite to deionized water is 1:40-50 g/ml; the rotating speed of the stirring is 200-300r/min, and the rotating speed of the high-speed stirring is 700-900 r/min; the addition amount of the pretreated silicon dioxide nano particles is 10-15% of the mass of the pretreated nano-montmorillonite; the solution for adjusting the pH is 0.1-0.3mol/L hydrochloric acid solution; the mass percentage of the pulp fiber treatment liquid is 13-18%.
7. The process of claim 1, wherein in step 5), the pulp fiber treatment solution is added in an amount of 20-35% of the mass of the diluted pulp fibers; the grouting procedure time is 5-8s, and the suction filtration procedure time is 25-35 s; the squeezing-drying treatment is to squeeze the pulp fiber after suction filtration under the pressure of 4-6MPa, then dry for 15-20min at 70-90 ℃, and treat for 4-5 times alternately.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113564951A (en) * | 2021-07-30 | 2021-10-29 | 漳州鑫圣源包装制品有限公司 | High-strength compression-resistant corrugated carton |
| CN116043610A (en) * | 2023-02-23 | 2023-05-02 | 武汉虹之彩包装印刷有限公司 | Preparation method of cigarette packaging paper |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113564951A (en) * | 2021-07-30 | 2021-10-29 | 漳州鑫圣源包装制品有限公司 | High-strength compression-resistant corrugated carton |
| CN116043610A (en) * | 2023-02-23 | 2023-05-02 | 武汉虹之彩包装印刷有限公司 | Preparation method of cigarette packaging paper |
| CN116043610B (en) * | 2023-02-23 | 2024-05-10 | 武汉虹之彩包装印刷有限公司 | Preparation method of cigarette packaging paper |
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