CN114808524A - Paper and preparation method thereof - Google Patents
Paper and preparation method thereof Download PDFInfo
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- CN114808524A CN114808524A CN202210370002.4A CN202210370002A CN114808524A CN 114808524 A CN114808524 A CN 114808524A CN 202210370002 A CN202210370002 A CN 202210370002A CN 114808524 A CN114808524 A CN 114808524A
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- filler
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- initial slurry
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- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000000945 filler Substances 0.000 claims abstract description 181
- 125000002091 cationic group Chemical group 0.000 claims abstract description 73
- 229920002678 cellulose Polymers 0.000 claims abstract description 48
- 239000001913 cellulose Substances 0.000 claims abstract description 48
- 239000002002 slurry Substances 0.000 claims abstract description 44
- 229920000642 polymer Polymers 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims abstract description 30
- 230000014759 maintenance of location Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 15
- 229920001046 Nanocellulose Polymers 0.000 claims description 36
- 239000003795 chemical substances by application Substances 0.000 claims description 26
- 230000002209 hydrophobic effect Effects 0.000 claims description 25
- 229920001131 Pulp (paper) Polymers 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 229920002472 Starch Polymers 0.000 claims description 13
- 229920002401 polyacrylamide Polymers 0.000 claims description 13
- 239000008107 starch Substances 0.000 claims description 13
- 235000019698 starch Nutrition 0.000 claims description 13
- 239000011121 hardwood Substances 0.000 claims description 8
- 239000011122 softwood Substances 0.000 claims description 8
- VBIIFPGSPJYLRR-UHFFFAOYSA-M Stearyltrimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)C VBIIFPGSPJYLRR-UHFFFAOYSA-M 0.000 claims description 7
- -1 alkyl ketene dimer Chemical compound 0.000 claims description 7
- 125000000129 anionic group Chemical group 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 claims description 3
- 229920001519 homopolymer Polymers 0.000 claims description 3
- 229920000768 polyamine Polymers 0.000 claims description 3
- 239000005871 repellent Substances 0.000 claims description 3
- 230000002940 repellent Effects 0.000 claims description 3
- 229940014800 succinic anhydride Drugs 0.000 claims description 3
- 229920006158 high molecular weight polymer Polymers 0.000 claims 1
- 239000000123 paper Substances 0.000 description 85
- 238000003756 stirring Methods 0.000 description 38
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 12
- 238000007865 diluting Methods 0.000 description 12
- 229910000019 calcium carbonate Inorganic materials 0.000 description 10
- 239000000835 fiber Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000000084 colloidal system Substances 0.000 description 4
- 238000004513 sizing Methods 0.000 description 4
- 239000011436 cob Substances 0.000 description 3
- 125000001165 hydrophobic group Chemical group 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 239000002114 nanocomposite Substances 0.000 description 2
- 229920005615 natural polymer Polymers 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229940088417 precipitated calcium carbonate Drugs 0.000 description 2
- 239000012744 reinforcing agent Substances 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 1
- 101000880310 Homo sapiens SH3 and cysteine-rich domain-containing protein Proteins 0.000 description 1
- 102100037646 SH3 and cysteine-rich domain-containing protein Human genes 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
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
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/25—Cellulose
-
- 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
- D21H17/29—Starch cationic
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
- D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
-
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- 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
Abstract
The invention discloses paper and a preparation method thereof, wherein the preparation method of the paper comprises the following steps: obtaining a filler and an initial slurry; adding a cationic high-molecular polymer and nano-cellulose into a filler, and uniformly mixing to obtain a filler prepolymer; and adding the filler prepolymer into the initial slurry, and making paper to prepare paper. The method can reduce the problem of paper strength reduction caused by filler addition, and simultaneously, the filler retention rate can be greatly improved.
Description
Technical Field
The invention relates to the technical field of paper preparation, in particular to paper and a preparation method thereof.
Background
With the development of social civilization becoming faster and faster, the demand for paper also growing day by day, the main raw material of papermaking is paper pulp, and the resource of forest is limited, though the artificial afforestation development is very fast now, still can not catch up with the demand that papermaking increases rapidly. As one of means for reducing the amount of pulp added, the amount of pulp added to the paper can be reduced by increasing the filler to raise the ash content of the paper.
However, when the ash content of the paper is increased, the binding capacity of the filler and the fibers is poor, the retention performance of the system is also poor, the increase of the ash content inevitably causes the strength of the finished paper to be reduced, the white water concentration of the system is increased, and the operation of a paper machine and the printing performance of the paper are influenced.
At present, the paper pulp is mainly compensated by adding the reinforcing agent, but the reinforcing agent has a limit on the amplification of paper, the bottleneck is reached when a certain amplification is reached, otherwise, other problems can be caused, such as influence on the charge balance of a system, paper breakage and hole breakage caused by increase of stickies and the like.
Disclosure of Invention
The invention provides paper and a preparation method thereof, which aim to solve the problem of insufficient strength of the paper.
In order to solve the technical problem, the invention provides a preparation method of paper, which comprises the following steps: obtaining a filler and initial slurry; adding a cationic high-molecular polymer and nano-cellulose into a filler, and uniformly mixing to obtain a filler prepolymer; and adding the filler prepolymer into the initial slurry, and making paper to prepare paper.
The preparation method comprises the following steps of adding a filler prepolymer into initial slurry, and making paper, wherein the step of preparing paper comprises the following steps: adding the filler prepolymer into the initial slurry, and uniformly mixing; and respectively adding the cationic starch, the cationic retention aid and the anionic retention aid into the initial slurry, uniformly mixing, and making paper to prepare the paper.
The preparation method comprises the following steps of adding a cationic high molecular polymer and nano cellulose into a filler, and uniformly mixing to obtain a filler prepolymer, wherein the step of obtaining the filler prepolymer further comprises the following steps: the hydrophobizing agent is added to the filler and mixed homogeneously.
Wherein the hydrophobic agent comprises one or more of octadecyl trimethyl ammonium chloride, alkyl ketene dimer and alkenyl succinic anhydride; the amount of the hydrophobizing agent added is in the range of 0.1 to 1.0% relative to the oven dry weight of the filler.
Wherein the step of obtaining the filler and the initial slurry comprises: obtaining the filler with the concentration range of 10-30%; and obtaining an initial slurry comprising one or more of softwood pulp, hardwood pulp, and mechanical pulp.
Wherein the addition amount of the filler prepolymer is in the range of 10 to 50% relative to the oven dry amount of the initial slurry.
Wherein the amount of the nanocellulose added is in the range of 0.1 to 3.0% with respect to the oven dry amount of the initial slurry.
Wherein the cationic high molecular polymer comprises one or more of cationic polyacrylamide, cationic starch, cationic polyamine and dimethyl diallyl ammonium chloride homopolymer.
Wherein the cationic high molecular polymer is added in an amount ranging from 0.01 to 1.00% relative to the oven dry weight of the filler, and has a molecular weight ranging from 100 to 1000 ten thousand.
In order to solve the technical problems, the invention also provides paper which is prepared by the preparation method of any one of the paper.
The invention has the beneficial effects that: different from the situation of the prior art, the method comprises the steps of adding a cationic high molecular polymer, nano-cellulose and a hydrophobic agent into a filler, uniformly mixing to obtain a filler prepolymer, adding the filler prepolymer into initial slurry, papermaking to prepare paper, and simultaneously attracting the nano-cellulose and the filler with negative charges on the surfaces by utilizing the positive charges on the surface of the cationic high molecular polymer to obtain the filler prepolymer, so that the nano-cellulose and the filler can be well wrapped together in advance, and the bonding degree of the nano-cellulose and the filler is improved. Meanwhile, in order to avoid the influence of ash content improvement on the water resistance of the paper, the filler prepolymer is subjected to hydrophobic modification, so that the water resistance of the paper is improved.
Drawings
FIG. 1 is a schematic flow chart of one embodiment of a method of making paper according to the present invention;
FIG. 2 is a schematic flow chart of another embodiment of a process for making paper according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a method for making paper according to the present invention.
Step S11: a filler and an initial slurry were obtained.
The filler and initial slurry were obtained first. The filler may, among other things, comprise precipitated calcium carbonate PCC, ground calcium carbonate GCC or a mixture of precipitated and ground calcium carbonate. Ground calcium carbonate is naturally occurring calcium carbonate rock, while precipitated calcium carbonate is synthetically produced calcium carbonate.
And the starting Pulp includes Pulp composed of softwood Pulp (NBKP, Needle-beaten Kraft Pulp), hardwood Pulp (LBKP, Loaf beaten Kraft Pulp), mechanical Pulp (alkaline hydrogen peroxide mechanical Pulp APMP, Alkalineperoxide mechanical Pulp or wood chip Bleached groundwood BCTMP, Bleaached Chemical Thermal-mechanical Pulp) and the above Pulp mixture.
Here, the initial slurry is obtained just before step S13.
Step S12: and adding the cationic high-molecular polymer and the nano-cellulose into the filler, and uniformly mixing to obtain the filler prepolymer.
After the filler is obtained, adding the cationic high-molecular polymer and the nano-cellulose into the filler, and uniformly mixing to obtain the filler prepolymer.
The nano-cellulose as a novel material has excellent performances such as large specific surface area, high crystallinity, high mechanical property and the like, and can be compounded with other natural polymers or artificially synthesized materials to form a nano-composite material so as to improve the mechanical property and the physical property. The nano-cellulose-containing paper pulp is made of paper pulp raw materials, and can be tightly combined with paper pulp fibers when being added into the paper pulp, so that the binding force among the paper pulp fibers is improved, the problem of reduced paper strength caused by the filler can be solved to a certain extent by adding the nano-cellulose into the filler, and the strength of the paper is further improved.
However, the surfaces of unmodified nano-cellulose and the filler are negative charges, and the nano-cellulose and the filler cannot be directly and well wrapped together by the principle of like charges repulsion, so that the retention and strength improvement of the filler are limited.
Therefore, this embodiment adds cationic high molecular polymer and nanocellulose to the filler simultaneously, utilize the positive charge on cationic high molecular polymer surface to attract surface nanocellulose and filler for the negative charge simultaneously, obtain the filler prepolymer, make nanocellulose and filler just can wrap up together well in advance, improve the degree of combination of nanocellulose and filler, improve nanocellulose's effective utilization, thereby on the basis of the problem that the pertinence was solved the paper strength that the filler brought and is reduced, further improve the degree of consistency and the intensity of paper.
In addition, in the embodiment, before the filler is added into the initial slurry, the cationic high molecular polymer, the nanocellulose and the filler are mixed into the filler prepolymer in advance, so that the effective bonding rate between the nanocellulose and the filler can be improved, the ineffective dissociation of the nanocellulose is reduced, the effectiveness of the filler prepolymer is improved, and the strength of the finished paper is further improved.
Step S13: and adding the filler prepolymer into the initial slurry, and making paper to prepare paper.
And after the filler prepolymer is obtained, adding the filler prepolymer into the initial slurry, and making paper to prepare the paper.
Through the above steps, the method for preparing paper of this embodiment adds cationic high molecular polymer and nanocellulose to the filler, and mixing uniformly to obtain a filler prepolymer, adding the filler prepolymer into the initial slurry, making paper, to prepare paper, the problem of reduced paper strength caused by the filler can be solved to a certain extent by adding the nano-cellulose into the filler, the paper strength is improved, and the positive charges on the surface of the cationic high molecular polymer are utilized to simultaneously attract the nano-cellulose and the filler with negative charges on the surface to obtain a filler prepolymer, so that the nano-cellulose and the filler can be well wrapped together in advance, the effective utilization rate of the nano-cellulose is improved, therefore, the uniformity and the strength of the paper are further improved on the basis of pertinently solving the problem of the reduction of the paper forming strength caused by the filler.
Referring to fig. 2, fig. 2 is a schematic flow chart of another embodiment of the paper manufacturing method of the present invention.
Step S21: a filler and an initial slurry were obtained.
This step is the same as step S11 in the previous embodiment, and please refer to the foregoing description, which is not repeated herein.
Step S22: adding a cationic high-molecular polymer and nano-cellulose into the filler, uniformly mixing, adding a hydrophobic agent into the filler, and uniformly mixing to obtain the filler prepolymer.
After the filler is obtained, adding the cationic high molecular polymer and the nano-cellulose into the filler and uniformly mixing, and adding the hydrophobic agent into the filler and uniformly mixing to obtain the filler prepolymer.
The nano-cellulose as a novel material has excellent performances such as large specific surface area, high crystallinity, high mechanical property and the like, and can be compounded with other natural polymers or artificially synthesized materials to form a nano-composite material so as to improve the mechanical property and the physical property. The nano-cellulose fiber paper is made of paper pulp raw materials, and can be tightly combined with paper pulp fibers when being added into paper pulp, so that the bonding force among the paper pulp fibers is improved, and the problem of reduced paper strength caused by the filler can be solved to a certain extent by adding the nano-cellulose into the filler. However, the surfaces of unmodified nano-cellulose and the filler are negative charges, and the nano-cellulose and the filler cannot be directly and well wrapped together by the principle of like charges repulsion, so that the retention and strength improvement of the filler are limited.
Therefore, the embodiment adds cationic high molecular polymer and nanocellulose to the filler, utilizes the positive charge on the surface of the cationic high molecular polymer to attract the nanocellulose and the filler with negative charges on the surface simultaneously, obtains the filler prepolymer, so that the nanocellulose and the filler can be well wrapped together in advance, the effective utilization rate of the nanocellulose is improved, and the uniformity and the strength of the paper are further improved on the basis of solving the problem of the decrease of the paper strength caused by the filler in a targeted manner.
The order of adding the nanocellulose and the cationic high molecular polymer can be selected based on actual conditions, for example: adding the nano-cellulose and the cationic high molecular polymer at the same time; firstly adding nano cellulose and then adding a cationic high molecular polymer; firstly, adding the cationic high molecular polymer and then adding the nano cellulose. Preferably, in a specific application scenario, the nano-cellulose may be added and stirred uniformly, and then the cationic high molecular polymer is added and stirred uniformly to obtain the filler prepolymer. The effective polymerization of the cationic high molecular polymer to the nano cellulose and the filler can be improved by adding the nano cellulose and stirring uniformly, and then adding the cationic high molecular polymer into the uniformly mixed mixture of the filler and the nano cellulose, so that the combination degree of the nano cellulose and the filler is further improved.
In the step, in order to avoid the influence of ash lifting on the water resistance of paper, the filler prepolymer is subjected to hydrophobic modification, the hydrophilic and hydrophobic two-sided performance of the hydrophobic agent is utilized, the hydrophilic group of the hydrophobic agent is combined with the nanocellulose through hydroxyl, so that the hydrophobic agent is coated on the surface of the filler, the hydrophobic group of the hydrophobic agent is distributed outside the filler, the adsorption of the filler on a sizing agent in a system is reduced, and the influence of the increase of the filler on the water resistance of the paper is avoided.
In a specific embodiment, the filler concentration may be diluted to 10-30%, wherein the filler concentration of this embodiment is higher, so that the ash content of the paper is increased by the filler with higher concentration, and the amount of pulp used in the paper is reduced. Then adding nano cellulose with the addition amount ranging from 0.1 to 3.0 percent relative to the absolute dry weight of the initial slurry and cationic high molecular polymer with the addition amount ranging from 0.01 to 1.00 percent relative to the absolute dry weight of the filler, uniformly stirring, finally adding a hydrophobic agent with the addition amount ranging from 0.1 to 1.0 percent relative to the absolute dry weight of the filler into the filler, and uniformly mixing to obtain the filler prepolymer.
The concentration of the filler can be diluted to 10%, 12%, 15%, 16%, 20%, 24%, 28 or 30%, the addition amount of the nanocellulose can be 0.1%, 0.5%, 0.8%, 1.2%, 1.6%, 1.9%, 2.1%, 2.5%, 2.8% or 3.0%, the addition amount of the cationic high molecular polymer can be 0.01%, 0.09%, 0.15%, 0.24%, 0.36%, 0.42%, 0.51%, 0.68%, 0.75%, 0.88%, 0.95% or 1.00%, and the like. The amount of the water repellent to be added may be specifically 0.1%, 0.3%, 0.4%, 0.6%, 0.7%, 0.9%, 1.0%, or the like. The water repellent agent in the range can not only avoid the influence of the increase of the using amount of the filler on the water resistance of the paper, but also reduce the adsorption of the filler on the sizing agent in the system.
The cationic high molecular polymer comprises one or more of cationic polyacrylamide, cationic starch, cationic polyamine and dimethyl diallyl ammonium chloride homopolymer, the molecular weight range is 100-1000 ten thousand, the specific molecular weight can be 100-160-ten-thousand, 240-ten-thousand, 380-ten-thousand, 460-ten-550-680-ten-thousand, 770-ten-thousand, 830-ten-thousand, 950-ten-thousand or 1000-ten-thousand, and the like, and the cationic high molecular polymer in the molecular weight range can be effectively combined with the filler to form the filler prepolymer. The nano-cellulose can be prepared by a pure mechanical method, an alkali swelling method, a carboxyethyl method and the like. The carboxyl content of the nano-cellulose is in the range of 0.1-1.0mmol/g, specifically 0.1mmol/g, 0.3mmol/g, 0.4mmol/g, 0.6mmol/g, 0.7mmol/g, 0.9mmol/g or 1.0 mmol/g; the diameter is 10 nm-100 nm. Specifically, the wavelength of the light source can be 10nm, 24nm, 35nm, 42nm, 51nm, 68nm, 72nm, 84nm, 95nm, 100nm and the like; the length may be 0.5 to 20.0. mu.m, specifically, 0.5, 1.4, 2.6, 3.4, 4.6, 5.9, 7.2, 9.1, 13.5, 14.2, 15.6, 17.6, 18.4, 19.5, 20.0. mu.m. The nanocellulose within the range can be tightly combined with the pulp fibers, so that the combination force between the pulp fibers is improved.
The hydrophobic agent includes any one of octadecyl trimethyl ammonium chloride (STAC), Alkyl Ketene Dimer (AKD), and Alkenyl Succinic Anhydride (ASA).
The nano-cellulose and the filler are pretreated by the cationic high molecular polymer to form filler prepolymer (NaFi), the surface of the filler is coated with the nano-cellulose, and the nano-cellulose has a large specific surface area and a large number of carboxyl groups and can be tightly combined with paper pulp fibers, so that the problem of strength reduction caused by filler addition can be solved, and the filler retention rate can be greatly improved.
In the embodiment, before the filler is added into the initial slurry, the cationic high molecular polymer, the nano-cellulose and the filler are mixed into the filler prepolymer in advance, so that the effective bonding rate between the nano-cellulose and the filler can be improved, and the ineffective dissociation of the nano-cellulose is reduced, thereby improving the effectiveness of the filler prepolymer and further improving the strength of finished paper.
In addition, in the embodiment, a hydrophobic agent is added into the filler, and by utilizing the hydrophilic and hydrophobic two-sided properties of the hydrophobic agent, the hydrophilic group of the hydrophobic agent is combined with the nanocellulose through hydroxyl groups, so that the hydrophobic agent is coated on the surface of the filler, and the hydrophobic group of the hydrophobic agent is distributed outside the filler, thereby reducing the adsorption of the filler on the sizing agent in the system, and avoiding the influence of the increase of the filler amount on the water resistance of the paper.
Step S23: and adding the filler prepolymer into the initial slurry, uniformly mixing, respectively adding the cationic starch, the cationic retention aid and the anionic retention aid into the initial slurry, uniformly mixing, and papermaking to prepare the paper.
And after the filler prepolymer is obtained, adding the filler prepolymer into the initial slurry, uniformly mixing, then respectively adding the cationic starch, the cationic retention aid and the anionic retention aid into the initial slurry, uniformly mixing, and making to prepare the paper.
The addition amount of the filler prepolymer to the oven dry amount of the initial slurry is 10 to 50%, specifically 10%, 15%, 19%, 24%, 26%, 32%, 35%, 39%, 41%, 46%, 49%, 50%, and the like, and specifically may be set specifically based on the ash content of the paper.
The amount of the cationic starch added to the initial slurry oven-dried may be in the range of 0.5 to 1.5%, specifically 0.5%, 0.7%, 0.9%, 1.0%, 1.2%, 1.4%, 1.5% and the like, the amount of the cationic retention aid added to the initial slurry oven-dried may be in the range of 100-1000ppm, specifically 100ppm, 150ppm, 230ppm, 350ppm, 480ppm, 510ppm, 680ppm, 750ppm, 840ppm, 930ppm, 100ppm and the like, and the amount of the anionic retention aid added to the initial slurry oven-dried may be in the range of 1500-15000ppm, specifically 1500ppm, 1800ppm, 2300ppm, 3500ppm, 4600ppm, 5100ppm, 6900ppm, 7300ppm, 8500ppm, 9400ppm, 10300ppm, 11500ppm, 13600ppm, 14900ppm, 15000ppm and the like.
The cationic retention aid comprises cationic polyacrylamide, and the anionic retention aid comprises bentonite or Silica colloid (Silica), and the dosage of the retention aid can be properly adjusted according to the addition amount of the filler.
The preparation method and performance of the paper with the above ratio of the present invention will be examined by a plurality of specific examples.
Comparative example 1:
mixing softwood pulp, hardwood pulp and alkaline hydrogen peroxide mechanical pulp according to the proportion of 20% + 60% + 20% to obtain initial pulp, diluting the initial pulp to 4% concentration, adding ground calcium carbonate with the concentration of 30% while stirring, stirring uniformly, adding cationic starch with the dosage of 1%, stirring uniformly, diluting the pulp to 1% concentration, respectively adding 200ppm of cationic polyacrylamide and 3000ppm of silicon dioxide colloid under the stirring state, and stirring uniformly to obtain paper.
Comparative example 2:
pretreating nano-cellulose and a filler to form a nano-cellulose filler prepolymer (NaFi), which comprises the following specific steps: diluting the ground calcium carbonate to the concentration of 20%, adding 0.01% (calculated relative to the absolute dryness of the filler) of cationic polyacrylamide, uniformly stirring, adding 0.1% (calculated relative to the absolute dryness of the slurry) of nanocellulose, and uniformly stirring to obtain the NaFi-1.
Mixing softwood pulp, hardwood pulp and alkaline hydrogen peroxide mechanical pulp according to the proportion of 20% + 60% + 20% to obtain initial pulp, diluting the initial pulp to 4% concentration, adding 30% NaFi while stirring, stirring uniformly, adding 1% dosage of cationic starch, stirring uniformly, diluting the pulp to 1% concentration, respectively adding 200ppm cationic polyacrylamide and 3000ppm Silica under the stirring state, and papermaking to obtain paper after stirring uniformly.
Example 1:
pretreating nano-cellulose and a filler to form a nano-cellulose filler prepolymer (NaFi), which comprises the following specific steps: diluting ground calcium carbonate to 20% of concentration, adding 0.01% (calculated relative to the absolute dryness of the filler) of cationic polyacrylamide, uniformly stirring, adding 0.1% (calculated relative to the absolute dryness of the slurry) of nanocellulose, uniformly stirring, adding 0.1% of octadecyl trimethyl ammonium chloride (calculated relative to the absolute dryness of the filler), and uniformly stirring to obtain NaFi-2;
mixing softwood pulp, hardwood pulp and alkaline hydrogen peroxide mechanical pulp according to the proportion of 20% + 60% + 20% to obtain initial pulp, diluting the initial pulp to 4% concentration, adding 30% NaFi-2 while stirring, stirring uniformly, adding 1% of cationic starch, stirring uniformly, diluting the pulp to 1%, adding 200ppm of cationic polyacrylamide and 3000ppm of Silica respectively while stirring, and stirring uniformly to obtain paper.
Example 2:
pretreating nano-cellulose and a filler to form a nano-cellulose filler prepolymer (NaFi), which comprises the following specific steps: grinding calcium carbonate to dilute to the concentration of 20%, adding 0.05% of cationic polyacrylamide (calculated relative to the absolute dryness of the filler), uniformly stirring, adding 1% of nano cellulose (calculated relative to the absolute dryness of the slurry), uniformly stirring, adding 0.5% of octadecyl trimethyl ammonium chloride (calculated relative to the absolute dryness of the filler), and uniformly stirring to obtain NaFi-3;
mixing softwood pulp, hardwood pulp and alkaline hydrogen peroxide mechanical pulp according to the proportion of 20% + 60% + 20% to obtain initial pulp, diluting the initial pulp to 4% concentration, adding 40% NaFi-3 while stirring, stirring uniformly, adding 1% of cationic starch, stirring uniformly, diluting the pulp to 1%, adding 300ppm of cationic polyacrylamide and 4500ppm of silicon dioxide colloid respectively while stirring, and stirring uniformly to obtain paper.
Example 3:
pretreating nano-cellulose and a filler to form a nano-cellulose filler prepolymer (NaFi), which comprises the following specific steps: grinding calcium carbonate to dilute to the concentration of 20%, adding 0.1% of cationic polyacrylamide (calculated relative to the absolute dryness of the filler), uniformly stirring, adding 3% of nano cellulose (calculated relative to the absolute dryness of the slurry), uniformly stirring, adding 1% of octadecyl trimethyl ammonium chloride (calculated relative to the absolute dryness of the filler), and uniformly stirring to obtain NaFi-4;
mixing softwood pulp, hardwood pulp and alkaline hydrogen peroxide mechanical pulp according to the proportion of 20% + 60% + 20% to obtain initial pulp, diluting the initial pulp to 4% concentration, adding 50% NaFi-4 while stirring, stirring uniformly, adding 1% of cationic starch, stirring uniformly, diluting the pulp to 1%, adding 400ppm of cationic polyacrylamide and 6000ppm of silicon dioxide colloid respectively while stirring, and papermaking to obtain paper after stirring uniformly.
Results test data for the above examples and comparative examples are as follows:
from the test results of comparative example 1 and each example, it can be seen that the ash content of the paper is increased by 1.3-10.0% by the preparation method of the paper of the present example, and the tensile strength of the paper can be maintained or improved compared with the comparative example, while the COBB value of the paper can be seen that, compared with comparative example 2 and comparative example 1, because the filler prepolymer is not subjected to hydrophobic modification, the COBB value is increased from 40 to 46, which indicates that the water resistance of the paper is reduced, and the filler prepolymer is subjected to water-resistant modification in the present example, and the COBB value is substantially equivalent. Meanwhile, after the ash content is increased, the production cost of the paper is reduced to different degrees.
In the embodiment, the nanocellulose and the filler are pretreated by the cationic high molecular polymer to form the nanocellulose and filler prepolymer, so that the combination of the filler and the fiber and the retention rate of the filler in a system can be increased. Meanwhile, in order to avoid the influence of ash content improvement on the water resistance of the paper, the filler prepolymer is subjected to hydrophobic modification, so that the water resistance of the paper is improved.
Through the steps, the preparation method of the paper of the embodiment comprises the steps of firstly increasing ash content of the paper by using the filler with higher concentration, then adding the cationic high molecular polymer and the nano-cellulose into the filler, uniformly mixing, adding the hydrophobic agent into the filler, uniformly mixing to obtain the filler prepolymer, then adding the filler prepolymer into the initial slurry, and performing papermaking to prepare the paper, can solve the problem of reduced paper strength caused by the filler to a certain extent by adding the nano-cellulose into the filler, improves paper strength, and simultaneously attracts the nano-cellulose and the filler with negative charges on the surfaces by using positive charges on the surface of the cationic high molecular polymer to obtain the filler prepolymer, so that the nano-cellulose and the filler can be well wrapped together in advance, and the binding degree of the nano-cellulose and the filler is improved, the effective utilization rate of the nano-cellulose is improved, so that the uniformity of paper is improved on the basis of pertinently solving the problem of the reduction of the paper strength caused by the filler. And this embodiment still avoids the ash to promote the influence to paper water resistance, carries out hydrophobic modification to the filler prepolymer, utilizes the hydrophilic hydrophobic two-sided nature of hydrophobe, and the hydrophilic group and the nanocellulose of hydrophobe pass through the hydroxyl and combine for the hydrophobe cladding is on the filler surface, and the hydrophobic group distribution of hydrophobe is outside at the filler, reduces the absorption of filler to sizing agent in the system, thereby has avoided the filler quantity to increase the influence to paper water resistance. Based on the same inventive concept, the application also provides paper which is prepared by the preparation method of the paper in any embodiment, so that the problem of strength reduction of the paper caused by filler addition can be reduced, and meanwhile, the filler retention rate can be greatly improved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method of making paper, comprising:
obtaining a filler and an initial slurry;
adding a cationic high-molecular polymer and nano-cellulose into the filler, and uniformly mixing to obtain a filler prepolymer;
and adding the filler prepolymer into the initial slurry, and making paper to prepare the paper.
2. The method of producing paper according to claim 1, wherein the step of adding the filler prepolymer to the initial slurry and performing paper making to produce the paper comprises:
adding the filler prepolymer into the initial slurry, and uniformly mixing;
and respectively adding cationic starch, a cationic retention aid and an anionic retention aid into the initial slurry, uniformly mixing, and making paper to prepare the paper.
3. The method for preparing paper according to claim 1, wherein the step of adding the cationic high molecular polymer and the nanocellulose into the filler and uniformly mixing to obtain the filler prepolymer further comprises:
adding a water repellent agent to the filler and mixing uniformly.
4. A process for the preparation of paper as claimed in claim 3 wherein the hydrophobic agent comprises one or more of octadecyl trimethyl ammonium chloride, alkyl ketene dimer and alkenyl succinic anhydride;
the amount of the hydrophobizing agent added is in the range of 0.1 to 1.0% relative to the oven dry weight of the filler.
5. A method of making paper as claimed in claim 1 in which the step of obtaining filler and initial slurry comprises:
obtaining the filler with the concentration range of 10-30%; and
obtaining the initial slurry containing one or more of softwood pulp, hardwood pulp and mechanical pulp.
6. The method of claim 1, wherein the filler prepolymer is added in an amount ranging from 10% to 50% relative to the oven dry weight of the initial slurry.
7. The method of claim 1, wherein the nanocellulose is added in an amount ranging from 0.1 to 3.0% relative to the oven dry weight of the initial slurry.
8. A process for the preparation of paper as claimed in claim 1 wherein the cationic high molecular weight polymer comprises one or more of cationic polyacrylamide, cationic starch, cationic polyamine, dimethyldiallylammonium chloride homopolymer.
9. The method for producing paper according to claim 1,
the addition amount of the cationic high molecular polymer relative to the oven dry weight of the filler is 0.01-1.00%, and the molecular weight is 100-1000 ten thousand.
10. Paper, characterized in that it is obtained by a process for the preparation of paper according to any one of claims 1 to 9.
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| CN102439226A (en) * | 2009-04-29 | 2012-05-02 | 芬欧汇川集团公司 | Method for producing furnish, furnish and paper |
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Application publication date: 20220729 |