CN110067158B - Paper and preparation method and application thereof - Google Patents
Paper and preparation method and application thereof Download PDFInfo
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- CN110067158B CN110067158B CN201910431372.2A CN201910431372A CN110067158B CN 110067158 B CN110067158 B CN 110067158B CN 201910431372 A CN201910431372 A CN 201910431372A CN 110067158 B CN110067158 B CN 110067158B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 229920001046 Nanocellulose Polymers 0.000 claims abstract description 113
- 238000000034 method Methods 0.000 claims abstract description 68
- 239000006185 dispersion Substances 0.000 claims abstract description 61
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 46
- 230000014759 maintenance of location Effects 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 238000007865 diluting Methods 0.000 claims abstract description 14
- 239000011268 mixed slurry Substances 0.000 claims abstract description 8
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 26
- 239000011324 bead Substances 0.000 claims description 26
- 229910052726 zirconium Inorganic materials 0.000 claims description 26
- 229920002678 cellulose Polymers 0.000 claims description 20
- 239000001913 cellulose Substances 0.000 claims description 20
- 239000000835 fiber Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000006229 carbon black Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 14
- 238000011049 filling Methods 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 13
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical group O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 239000010902 straw Substances 0.000 claims description 9
- 239000003575 carbonaceous material Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 239000002109 single walled nanotube Substances 0.000 claims description 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 5
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 5
- 244000025254 Cannabis sativa Species 0.000 claims description 5
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 claims description 5
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 claims description 5
- 235000014676 Phragmites communis Nutrition 0.000 claims description 5
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 5
- 239000011425 bamboo Substances 0.000 claims description 5
- 235000009120 camo Nutrition 0.000 claims description 5
- 235000005607 chanvre indien Nutrition 0.000 claims description 5
- 229910021389 graphene Inorganic materials 0.000 claims description 5
- 239000011487 hemp Substances 0.000 claims description 5
- 239000002028 Biomass Substances 0.000 claims description 4
- 239000002041 carbon nanotube Substances 0.000 claims description 4
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000002048 multi walled nanotube Substances 0.000 claims description 3
- 229920000875 Dissolving pulp Polymers 0.000 claims description 2
- 239000002154 agricultural waste Substances 0.000 claims description 2
- 238000003763 carbonization Methods 0.000 claims description 2
- 238000005229 chemical vapour deposition Methods 0.000 claims description 2
- 239000003085 diluting agent Substances 0.000 claims description 2
- 238000010790 dilution Methods 0.000 claims description 2
- 239000012895 dilution Substances 0.000 claims description 2
- 239000002612 dispersion medium Substances 0.000 claims description 2
- 230000002687 intercalation Effects 0.000 claims description 2
- 238000009830 intercalation Methods 0.000 claims description 2
- 239000007791 liquid phase Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 239000000049 pigment Substances 0.000 claims description 2
- 238000007639 printing Methods 0.000 claims description 2
- 238000004227 thermal cracking Methods 0.000 claims description 2
- 238000004299 exfoliation Methods 0.000 claims 3
- 244000082204 Phyllostachys viridis Species 0.000 claims 1
- 238000005034 decoration Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 abstract description 6
- 238000005728 strengthening Methods 0.000 abstract description 3
- 235000010980 cellulose Nutrition 0.000 description 16
- 239000002245 particle Substances 0.000 description 12
- 230000000844 anti-bacterial effect Effects 0.000 description 6
- 230000009172 bursting Effects 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 241001330002 Bambuseae Species 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 238000007385 chemical modification Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229920002907 Guar gum Polymers 0.000 description 1
- 229920000168 Microcrystalline cellulose Polymers 0.000 description 1
- 244000061176 Nicotiana tabacum Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000006266 etherification reaction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 235000019813 microcrystalline cellulose Nutrition 0.000 description 1
- 239000008108 microcrystalline cellulose Substances 0.000 description 1
- 229940016286 microcrystalline cellulose Drugs 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 239000011208 reinforced composite material Substances 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/08—Filter 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
Landscapes
- Paper (AREA)
Abstract
The invention discloses paper and a preparation method and application thereof, wherein the preparation method comprises the following steps: (1) adding the micro-nano cellulose dispersion liquid into the paper pulp dispersion liquid, diluting and mixing to obtain mixed slurry without the retention aid; (2) papermaking is carried out on the mixed pulp to obtain paper without retention aid; the diameter of the micro-nano cellulose is 200-500 nm, and the length-diameter ratio is more than or equal to 50. The preparation method of the paper provided by the invention can improve the retention rate in the paper making process even without adding a retention agent, has a paper strengthening effect, obtains the paper with excellent breaking resistance, tensile strength and ring crush resistance, and is simple to operate and environment-friendly.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to paper and a preparation method and application thereof.
Background
Cellulose is a renewable biomass resource, and is closely related to the life of people. With the continuous development of nanotechnology, research and application of micro-nano cellulose derived from biomass resources are gradually paid attention to, and the micro-nano cellulose has the advantages of high strength, high specific surface area, good biocompatibility, biodegradability and the like, is widely applied to the fields of reinforced composite materials, adsorption materials, filtering materials, biomedical materials and the like, has important application value, and becomes a research hotspot in the field of cellulose science in recent years. The paper compounded by the micro-nano cellulose and the plant fiber can effectively improve the physical strength of the paper. In addition, with the help of the strong binding capacity of the micro-nano cellulose and the plant fibers, the functional characteristics of the micro-nano cellulose are improved through chemical modification of the micro-nano cellulose, and the paper is endowed with special functions, so that the paper has an ideal effect, but the micro-nano cellulose needs to be subjected to chemical modification treatment, a large amount of chemical reagents are needed in the modification process, the environment is polluted, the operation is complex, and in the paper making process, the retention rate is low, and the tensile property, the breakage resistance and other properties of the paper are affected.
CN102180979A discloses a cationization modification method of micro-nano cellulose and a preparation method of high-strength cigarette paper, wherein potassium hydroxide and an etherification reaction promoter are adopted to perform cationization modification on the micro-nano cellulose, the modified micro-nano cellulose is used as a retention aid and a reinforcing agent to prepare the high-strength cigarette paper, but a large amount of chemical reagents are used in the modification process of the micro-nano cellulose, so that environmental pollution is caused.
CN103114501A discloses a production process of antibacterial paper, which comprises the following steps: providing a pulp; adding anionic nano microcrystalline cellulose and quaternary ammonium salt into the paper pulp to prepare mixed pulp; and making the mixed pulp into paper. The invention also relates to the antibacterial paper produced by the process. Compared with the prior art, the production process of the antibacterial paper can ensure that the antibacterial agent added in the paper pulp has good retention rate, and the antibacterial paper produced according to the production process of the antibacterial paper has good paper strength and antibacterial capability, but the paper obtained by the method has poor properties of breaking resistance, tensile strength and the like.
CN107620222A discloses a method for improving retention rate and drainage performance of slurry of a papermaking tobacco sheet, which adopts cation micro-nano cellulose, guar gum and calcium carbonate, prepares solution with certain concentration, adopts different adding modes to improve retention performance of slurry drainage and filler, but the preparation method is complex, and adopts cation modified micro-nano cellulose to cause harmful influence on the surrounding environment in the reuse process of paper.
Therefore, the present invention provides a method for preparing paper with high retention rate, which is environmentally friendly, easy to operate, and the obtained paper has excellent tensile and bursting resistance properties.
Disclosure of Invention
The invention aims to provide a preparation method of paper, which comprises the following steps:
(1) adding the micro-nano cellulose dispersion liquid into the paper pulp dispersion liquid, diluting and mixing to obtain mixed slurry without the retention aid;
(2) papermaking is carried out on the mixed pulp to obtain paper without retention aid;
the diameter of the micro-nano cellulose is 200-500 nm, such as 210nm, 250nm, 300nm, 350nm, 400nm, 450nm and 480nm, and the length-diameter ratio is not less than 50, such as 53, 55, 58, 60, 62, 65 and the like.
According to the preparation method of the paper, no retention agent is added, the micro-nano cellulose with a special size is added, in the process of mixing the paper pulp, the micro-nano cellulose is wound on the surface of the fine fiber due to the special size of the micro-nano cellulose, the micro-nano cellulose is fully lapped with the paper pulp fiber, gaps among the paper pulp fibers are filled, the retention effect is achieved, the retention rate in the paper making process can be improved even if no retention agent is added, the paper strengthening effect is achieved, and the paper with excellent breaking resistance and tensile property is obtained.
Preferably, the diameter of the micro-nano cellulose is 300-450 nm, such as 320nm, 350nm, 400nm, 430nm and the like.
When the diameter of the micro-nano cellulose is 300-450 nm, the micro-nano cellulose is wound on the surface of the fine fiber to reach the optimal state, and the retention rate in the papermaking process is highest.
Preferably, the concentration of the micro-nano cellulose dispersion is 5-10 wt%, such as 6 wt%, 7 wt%, 8 wt%, 9 wt%, 9.5 wt%, and the like.
When the concentration of the micro-nano cellulose dispersion liquid is 5-10 wt%, the obtained paper has the most excellent tensile and bursting properties, the concentration is too low, the reinforcing effect of the micro-nano cellulose on the paper is not obvious, the concentration is too high, the flexibility of the paper is reduced, and the paper becomes brittle.
Preferably, the micro-nano cellulose has a dry weight of 0.1-30 wt.%, such as 0.5 wt.%, 1 wt.%, 5 wt.%, 10 wt.%, 15 wt.%, 20 wt.%, 25 wt.%, 28 wt.%, preferably 3 wt.% to 4 wt.%, of the dry weight of the pulp.
Preferably, the dispersion media of the pulp dispersion liquid and the micro-nano cellulose dispersion liquid are both water.
Preferably, the diluted concentration of the mixed slurry is 0.2 to 1 wt%, such as 0.3 wt%, 0.4 wt%, 0.5 wt%, 0.6 wt%, 0.7 wt%, 0.8 wt%, 0.9 wt%, etc.
Preferably, the diluent used for the dilution is water.
Preferably, the pulp dispersion has a concentration of 3 to 4 wt%, such as 3.1 wt%, 3.2 wt%, 3.3 wt%, 3.4 wt%, 3.5 wt%, 3.6 wt%, 3.7 wt%, 3.8 wt%, 3.9 wt%, and the like.
Preferably, the pulp comprises any one or at least two of wood pulp, straw pulp, hemp pulp, reed pulp, cane pulp, bamboo pulp and rag pulp.
Preferably, the mixing method in step (1) is defibering mixing.
Preferably, the rotation number of the defibering is 5000-30000 revolutions, 5500 revolutions, 6000 revolutions, 6500 revolutions, 6000 revolutions, 7000 revolutions, 8000 revolutions, 10000 revolutions, 12000 revolutions, 15000 revolutions, 17000 revolutions, 19000 revolutions, 22000 revolutions, 25000 revolutions, 28000 revolutions, 29000 revolutions and the like.
The rotational speed of the fluffer is 3000 +/-50 rpm, the number of revolutions refers to the total number of revolutions at the rotational speed, and the fluffer stops when the number of revolutions is reached.
Preferably, a carbon material is added to the mixed slurry before the step (2).
The carbon material is added in the papermaking process, so that the uniformity of paper pulp can be effectively promoted, the evenness, the strength and the surface smoothness of paper can be further improved, and fine fibers can be further generated.
Preferably, the carbon material includes any one or a combination of at least two of a graphene material, carbon nanotubes, and carbon black.
Preferably, the preparation method of the graphene material comprises any one or at least two combinations of a mechanical stripping method, a redox method, a thermal cracking method, an intercalation stripping method, a chemical vapor deposition method, a liquid phase stripping method and a biomass hydrothermal carbonization method.
Preferably, the carbon nanotubes comprise single-walled carbon nanotubes and/or multi-walled carbon nanotubes.
Preferably, the carbon black includes any one or at least two combinations of rubber carbon black, pigment carbon black, conductive carbon black and special carbon black.
Preferably, the carbon material is added in an amount of 0.01 to 0.5 wt% of the oven-dry amount of the pulp, for example, 0.02 wt%, 0.05 wt%, 0.08 wt%, 0.1 wt%, 0.15 wt%, 0.2 wt%, 0.25 wt%, 0.3 wt%, 0.35 wt%, etc.
Preferably, the preparation method of the micro-nano cellulose dispersion comprises the following steps:
(1) dispersing a cellulose raw material in water to obtain a raw material dispersion liquid;
(2) and homogenizing the raw material dispersion liquid to obtain the micro-nano cellulose dispersion liquid.
Preferably, the method of dispersing comprises sanding.
Preferably, in the sanding process, the particle size of the zirconium beads is 0.8-1.5 mm, such as 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, etc., the filling rate of the zirconium beads is 50-70%, such as 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, etc., and the rotational speed of the sand mill is 1000-3000 rpm, such as 1100rpm, 1200rpm, 1300rpm, 1400rpm, 1500rpm, 1600rpm, 1700rpm, 1900rpm, 2000rpm, 2400rpm, 2500rpm, 2600rpm, 2800rpm, 2900rpm, and the number of cycles of the sanding is greater than or equal to 1, such as 2 times, 3 times, 4 times, 5 times, 6 times, 7 times, 8 times, etc.
Preferably, the homogenization pressure is 60 to 150MPa, such as 61MPa, 65MPa, 70MPa, 75MPa, 80MPa, 85MPa, 90MPa, 95MPa, 100MPa, 110MPa, 120MPa, 130MPa, 140MPa, 145MPa, etc., preferably 100 to 130 MPa.
Preferably, the cellulose raw material comprises any one or at least two of furfural residue, bleached wood pulp, bleached straw pulp, cotton pulp, dissolving pulp, secondary fiber, unbleached wood pulp, unbleached straw pulp and agricultural waste.
Preferably, the concentration of the cellulosic raw material in the raw material dispersion is 2-10 wt.%, e.g., 3 wt.%, 4 wt.%, 5 wt.%, 6 wt.%, 7 wt.%, 8 wt.%, 9 wt.%, etc.
Preferably, the content of cellulose in the cellulosic raw material is > 95 wt.%, e.g. 96 wt.%, 96.5 wt.%, 97 wt.%, 97.5 wt.%, 98 wt.%, 98.5 wt.%, etc.
The second purpose of the invention is to provide a paper which is prepared according to the preparation method of the first purpose;
the paper does not contain retention aids.
The third object of the invention is to provide the use of the paper obtained by the preparation method described in the second object for packaging, filtering, decorating or printing.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the preparation method of the paper, no retention agent is added, the micro-nano cellulose with a special size is added, in the process of mixing the paper pulp, the micro-nano cellulose is wound on the surface of the fine fiber due to the special size of the micro-nano cellulose, the micro-nano cellulose is fully lapped with the paper pulp fiber, gaps among the paper pulp fibers are filled, the retention effect is achieved, the retention rate in the paper making process can be improved even if no retention agent is added, the paper strengthening effect is achieved, the paper with excellent breaking resistance and tensile property is obtained, and the method is simple to operate and environment-friendly.
Wherein the burst index of the paper is 3.46-4.33 KPa.m2The ring pressure index is 5.51-7.56 N.m/g, the tensile index is 58.93-80.69 N.m/g, and the retention rate is 94.6-98.6%.
(2) In the preferred scheme, micro-nano cellulose with the diameter of 300-450 nm is selected, so that the winding on the surface of the fine fiber reaches the optimal state, and the retention rate in the papermaking process is highest;
in another preferred scheme, the micro-nano cellulose dispersion liquid with the concentration of 5-10 wt% is selected, so that the obtained paper has the most excellent tensile and bursting properties, and the bursting index of the obtained paper is 3.73-4.33 KPa.m2The ring pressure index is 5.63-7.56 N.m/g, the tensile index is 61.23-80.69 N.m/g, and the retention rate is 95.1-98.6%;
in another preferred scheme, the carbon material is added in the papermaking process, so that the uniformity of paper pulp can be effectively promoted, the evenness, the strength and the surface smoothness of paper can be further improved, and meanwhile, the generation of fine fibers is further caused.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
A method for making paper comprises:
(1) preparing micro-nano cellulose:
adding 6g of furfural slag with the cellulose content of 96 wt.% into 94g of water, sanding for 30min (the particle size of zirconium beads is 1mm, the filling rate of the zirconium beads is 60%, the rotating speed of a sand mill is 2000rpm, circulation is carried out for 1 time), and homogenizing for 15min (the homogenizing pressure is 120MPa) to obtain the micro-nano cellulose dispersion with the concentration of 6 wt%, wherein the diameter of the micro-nano cellulose is 350nm, and the length-diameter ratio is 60.
(2) Preparing paper: adding 5.8g of the micro-nano cellulose dispersion into 100g of wood pulp dispersion with the concentration of 3.5 wt% (the absolute dry weight of the micro-nano cellulose is 10 wt% of the absolute dry weight of the wood pulp), defibering and mixing at the rotating speed of 3000rpm (the revolution is 10000 revolutions), adding 10.5mg of single-walled nanotubes (accounting for 0.3 wt% of the absolute dry weight of the wood pulp), diluting the obtained mixed pulp to the concentration of 0.6 wt%, and papermaking to obtain paper.
Example 2
The difference from the embodiment 1 is that the sanding time is 10min, the diameter of the micro-nano cellulose is 500nm, and the length-diameter ratio is 50.
Example 3
The difference from the embodiment 1 is that the sanding time is 40min, the diameter of the micro-nano cellulose is 200nm, and the length-diameter ratio is 80.
Example 4
The difference from the embodiment 1 is that the sanding time is 20min, the diameter of the micro-nano cellulose is 450nm, and the length-diameter ratio is 55.
Example 5
The difference from the embodiment 1 is that the sanding time is 35min, the diameter of the micro-nano cellulose is 300nm, and the length-diameter ratio is 70.
Example 6
A method for making paper comprises:
(1) preparing micro-nano cellulose:
adding 10g of furfural slag with the cellulose content of 96 wt.% into 90g of water, sanding for 30min (the particle size of zirconium beads is 1mm, the filling rate of the zirconium beads is 60%, the rotating speed of a sand mill is 2000rpm, circulation is carried out for 1 time), and homogenizing for 15min (the homogenizing pressure is 120MPa) to obtain the micro-nano cellulose dispersion liquid with the concentration of 10 wt%, wherein the diameter of the micro-nano cellulose is 300nm, and the length-diameter ratio is 60.
(2) Preparing paper: adding 3.5g of the micro-nano cellulose dispersion into 100g of wood pulp dispersion with the concentration of 3.5 wt% (the absolute dry weight of the micro-nano cellulose is 10 wt% of the absolute dry weight of the wood pulp), defibering and mixing at the rotating speed of 3000rpm (the revolution is 10000 revolutions), adding 10.5mg of single-walled nanotubes (accounting for 0.3 wt% of the absolute dry weight of the wood pulp), diluting the obtained mixed pulp to the concentration of 0.6 wt%, and papermaking to obtain paper.
Example 7
A method for making paper comprises:
(1) preparing micro-nano cellulose:
adding 5g of furfural slag with the cellulose content of 96 wt.% into 95g of water, sanding for 30min (the particle size of zirconium beads is 1mm, the filling rate of the zirconium beads is 60%, the rotating speed of a sand mill is 2000rpm, circulation is carried out for 1 time), and homogenizing for 15min (the homogenizing pressure is 120MPa) to obtain the micro-nano cellulose dispersion with the concentration of 5 wt%, wherein the diameter of the micro-nano cellulose is 350nm, and the length-diameter ratio is 60.
(2) Preparing paper: adding 7g of the micro-nano cellulose dispersion into 100g of wood pulp dispersion with the concentration of 3.5 wt% (the absolute dry weight of the micro-nano cellulose is 10 wt% of the absolute dry weight of the wood pulp), defibering and mixing at the rotating speed of 3000rpm (the rotating speed is 10000 revolutions), adding 10.5mg of single-walled nanotubes (accounting for 0.3 wt% of the absolute dry weight of the wood pulp), diluting the obtained mixed pulp to the concentration of 0.6 wt%, and papermaking to obtain paper.
Example 8
A method for making paper comprises:
(1) preparing micro-nano cellulose:
adding 3g of furfural slag with the cellulose content of 96 wt.% into 97g of water, sanding for 30min (the particle size of zirconium beads is 1mm, the filling rate of the zirconium beads is 60%, the rotating speed of a sand mill is 2000rpm, circulation is carried out for 1 time), and homogenizing for 15min (the homogenizing pressure is 120MPa) to obtain the micro-nano cellulose dispersion with the concentration of 3 wt%, wherein the diameter of the micro-nano cellulose is 350nm, and the length-diameter ratio is 60.
(2) Preparing paper: adding 11.7g of the micro-nano cellulose dispersion into 100g of wood pulp dispersion with the concentration of 3.5 wt% (the absolute dry weight of the micro-nano cellulose is 10 wt% of the absolute dry weight of the wood pulp), defibering and mixing at the rotating speed of 3000rpm (the revolution is 10000 revolutions), adding 10.5mg of single-walled nanotubes (accounting for 0.3 wt% of the absolute dry weight of the wood pulp), diluting the obtained mixed pulp to the concentration of 0.6 wt%, and papermaking to obtain paper.
Example 9
A method for making paper comprises:
(1) preparing micro-nano cellulose:
adding 15g of furfural slag with the cellulose content of 96 wt.% into 85g of water, sanding for 30min (the particle size of zirconium beads is 1mm, the filling rate of the zirconium beads is 60%, the rotating speed of a sand mill is 2000rpm, circulation is carried out for 1 time), homogenizing for 15min (the homogenizing pressure is 120MPa), and obtaining the micro-nano cellulose dispersion liquid with the concentration of 15 wt%, wherein the diameter of the micro-nano cellulose is 350nm, and the length-diameter ratio is 60.
(2) Preparing paper: adding 2.3g of the micro-nano cellulose dispersion into 100g of wood pulp dispersion with the concentration of 3.5 wt% (the absolute dry weight of the micro-nano cellulose is 10 wt% of the absolute dry weight of the paper pulp), defibering and mixing at the rotating speed of 3000rpm (the revolution is 10000 revolutions), adding 10.5mg of single-walled nanotubes (accounting for 0.3 wt% of the absolute dry weight of the wood pulp), diluting the obtained mixed pulp to the concentration of 0.6 wt%, and papermaking to obtain paper.
Example 10
The difference from example 1 is that the untwining revolutions were 5000 revolutions.
Example 11
The difference from example 1 is that the number of untwining revolutions is 30000 revolutions.
Example 12
The difference from example 1 is that the untwining revolutions were 4000 revolutions.
Example 13
The difference from example 1 is that the number of untwining revolutions is 31000 revolutions.
Example 14
A method for making paper comprises:
(1) preparing micro-nano cellulose:
adding 2g of bleached wood pulp with the cellulose content of 95 wt.% into 98g of water, sanding for 30min (the particle size of zirconium beads is 0.8mm, the filling rate of the zirconium beads is 50%, the rotating speed of a sand mill is 3000rpm, circulating for 1 time), and homogenizing for 15min (the homogenizing pressure is 60MPa), so as to obtain the micro-nano cellulose dispersion with the concentration of 2 wt%, wherein the diameter of the micro-nano cellulose is 350nm, and the length-diameter ratio is 50.
(2) Preparing paper: concentrating the micro-nano cellulose dispersion to 6 wt%, adding 0.05g of the concentrated micro-nano cellulose dispersion into 100g of wood pulp dispersion with the concentration of 3 wt% (the absolute dry weight of the micro-nano cellulose is 0.1 wt% of the absolute dry weight of the wood pulp), defibering and mixing at the rotating speed of 3000rpm (the revolution is 10000 revolutions), adding 0.3mg of multi-walled nanotubes (accounting for 0.01 wt% of the absolute dry weight of the wood pulp), diluting the obtained mixed pulp to the concentration of 0.2 wt%, and papermaking to obtain paper.
Example 15
(1) Preparing micro-nano cellulose:
adding 6g of cotton pulp with the cellulose content of 96 wt.% into 94g of water, sanding for 30min (the particle diameter of zirconium beads is 1.5mm, the filling rate of the zirconium beads is 70%, the rotating speed of a sand mill is 3000rpm, circulating for 1 time), and homogenizing for 15min (the homogenizing pressure is 150MPa), so as to obtain the micro-nano cellulose dispersion liquid with the concentration of 6 wt%, wherein the diameter of the micro-nano cellulose is 350nm, and the length-diameter ratio is 60.
(2) Preparing paper: adding 20g of the micro-nano cellulose dispersion into 100g of straw pulp dispersion with the concentration of 4 wt% (the oven dry weight of the micro-nano cellulose is 30 wt% of the oven dry weight of the straw pulp), defibering and mixing at the rotating speed of 3000rpm (the revolution is 10000 revolutions), adding 0.2g of graphene (accounting for 0.5 wt% of the oven dry weight of wood pulp) obtained by a mechanical stripping method, diluting the obtained mixed pulp to the concentration of 1 wt%, and papermaking to obtain paper.
Example 16
A method for making paper comprises:
(1) preparing micro-nano cellulose:
adding 6g of bleached straw pulp with the cellulose content of 96 wt.% into 94g of water, sanding for 10min (the particle diameter of zirconium beads is 1mm, the filling rate of the zirconium beads is 60%, the rotating speed of a sand mill is 2000rpm, circulation is carried out for 1 time), homogenizing for 15min (the homogenizing pressure is 100MPa), and obtaining the micro-nano cellulose dispersion with the concentration of 6 wt%, wherein the diameter of the micro-nano cellulose is 500nm, and the length-diameter ratio is 50.
(2) Preparing paper: adding 1.8g of the micro-nano cellulose dispersion into 100g of hemp pulp dispersion with the concentration of 3.5 wt% (the absolute dry weight of the micro-nano cellulose is 3 wt% of the absolute dry weight of the hemp pulp), defibering and mixing at the rotating speed of 3000rpm (the revolution is 10000 revolutions), adding 10.5mg of carbon black (accounting for 0.3 wt% of the absolute dry weight of the hemp pulp), diluting the obtained mixed pulp to the concentration of 0.6 wt%, and papermaking to obtain paper.
Example 17
A method for making paper comprises:
(1) preparing micro-nano cellulose:
adding 6g of dissolving slurry with the cellulose content of 96 wt.% into 94g of water, sanding for 30min (the particle diameter of zirconium beads is 1mm, the filling rate of the zirconium beads is 60%, the rotating speed of a sand mill is 2000rpm, circulation is carried out for 1 time), homogenizing for 15min (the homogenizing pressure is 130MPa), and obtaining the micro-nano cellulose dispersion with the concentration of 6 wt%, wherein the diameter of the micro-nano cellulose is 350nm, and the length-diameter ratio is 60.
(2) Preparing paper: adding 2.3g of the micro-nano cellulose dispersion into 100g of bamboo pulp dispersion with the concentration of 3.5 wt% (the absolute dry amount of the micro-nano cellulose is 4 wt% of the absolute dry amount of the bamboo pulp), defibering and mixing at the rotating speed of 3000rpm (the revolution is 10000 revolutions), adding 10.5mg of carbon black (accounting for 0.3 wt% of the absolute dry amount of the bamboo pulp), diluting the obtained mixed pulp to the concentration of 0.3 wt%, and papermaking to obtain paper.
Example 18
A method for making paper comprises:
(1) preparing micro-nano cellulose:
adding 6g of unbleached wood pulp with the cellulose content of 96 wt.% into 94g of water, sanding for 30min (the particle size of zirconium beads is 1mm, the filling rate of the zirconium beads is 60%, the rotating speed of a sand mill is 2000rpm, circulation is carried out for 1 time), homogenizing for 15min (the homogenizing pressure is 120MPa), and obtaining the micro-nano cellulose dispersion with the concentration of 6 wt%, wherein the diameter of the micro-nano cellulose is 350nm, and the length-diameter ratio is 60.
(2) Preparing paper: adding 5.8g of the micro-nano cellulose dispersion into 100g of reed pulp dispersion with the concentration of 3.5 wt% (the absolute dry weight of the micro-nano cellulose is 10 wt% of the absolute dry weight of the reed pulp), defibering and mixing at the rotating speed of 3000rpm (the revolution is 10000 revolutions), adding 10.5mg of carbon black (accounting for 0.3 wt% of the absolute dry weight of the reed pulp), diluting the obtained mixed pulp to the concentration of 0.8 wt%, and papermaking to obtain paper.
Example 19
A method for making paper comprises:
(1) preparing micro-nano cellulose:
adding 6g of secondary fibers with the cellulose content of 96 wt.% into 94g of water, sanding for 30min (the particle diameter of zirconium beads is 1mm, the filling rate of the zirconium beads is 60%, the rotating speed of a sand mill is 2000rpm, circulation is carried out for 1 time), homogenizing for 15min (the homogenizing pressure is 120MPa), and obtaining the micro-nano cellulose dispersion with the concentration of 6 wt%, wherein the diameter of the micro-nano cellulose is 350nm, and the length-diameter ratio is 60.
(2) Preparing paper: adding 5.8g of the micro-nano cellulose dispersion into 100g of cane pulp dispersion with the concentration of 3.5 wt% (the oven dry weight of the micro-nano cellulose is 10 wt% of the oven dry weight of the cane pulp), defibering and mixing at the rotating speed of 3000rpm (the revolution is 10000 revolutions), adding 10.5mg of carbon black (accounting for 0.3 wt% of the oven dry weight of the cane pulp), diluting the obtained mixed pulp to the concentration of 0.9 wt%, and papermaking to obtain paper.
Comparative example 1
The difference from the embodiment 1 is that the sanding time is 50min, the diameter of the micro-nano cellulose is 150nm, and the length-diameter ratio is 90.
Comparative example 2
The difference from the example 1 is that the grinding time is 8min, the diameter of the micro-nano cellulose is 550nm, and the length-diameter ratio is 40.
Performance testing
(1) The burst index was determined according to the procedures specified in GB/T454-2002.
(2) The ring pressure index was determined according to the procedures specified in GB/T454-2002.
(3) The tensile index was determined according to the procedures specified in GB/T453-2002.
(4) The retention was measured using a vimard retention meter.
The results of the performance tests are shown in table 1.
Table 1 summary of performance test results
As can be seen from table 1, in the embodiment, the mechanical property and the retention rate of the paper are better than the comparative example, the retention rate is higher than 10% of the comparative example, and the burst index, the ring crush index and the tensile index are all improved by 15% to 30%, because the special size of the micro-nano cellulose is added, in the process of mixing the paper pulp, the micro-nano cellulose is wound on the surface of the fine fiber, and is fully overlapped with the paper pulp fiber, and the gaps between the paper pulp fibers are also filled, so that the retention rate in the paper making process can be improved even if no retention agent is added, the effect of enhancing the paper is achieved, and the paper with excellent burst resistance and tensile property is obtained.
As can be seen from comparison of examples 1 to 5, when the diameter of the micro-nano cellulose is 300 to 450nm (examples 1, 4 and 5), the winding on the surface of the fine fiber is in the best state, and the retention rate and the mechanical property in the paper making process are best.
Comparing examples 1 and 6 to 9, it can be seen that when the concentration of the micro-nano cellulose dispersion is 5 to 10 wt% (examples 1, 6 and 7), the obtained paper has the most excellent tensile, breaking and ring crush resistant properties, the concentration is too low, the reinforcing effect of the micro-nano cellulose on the paper is not obvious, and the concentration is too high, so that the paper becomes brittle.
It is understood from comparison of examples 1, 10 and 13 that the tensile properties, bursting properties, ring crush properties and retention of the obtained paper sheets are further improved when the fluffing speed is 5000 to 30000 revolutions (examples 1, 10 and 11).
The present invention is illustrated in detail by the examples described above, but the present invention is not limited to the details described above, i.e., it is not intended that the present invention be implemented by relying on the details described above. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (24)
1. A method for making paper, comprising the steps of:
(1) adding the micro-nano cellulose dispersion liquid into the paper pulp dispersion liquid, diluting and mixing to obtain mixed slurry without the retention aid;
(2) adding a carbon material into the mixed slurry, and papermaking the mixed slurry to obtain paper without a retention aid;
the diameter of the micro-nano cellulose is 200-500 nm, and the length-diameter ratio is more than or equal to 50;
the concentration of the micro-nano cellulose dispersion liquid is 5-10 wt%;
the oven-dry amount of the micro-nano cellulose is 0.1-30 wt% of the oven-dry amount of the paper pulp;
the adding amount of the carbon material is 0.01-0.5 wt% of the absolute dry amount of the paper pulp;
the retention rate of the paper prepared by the method is 95.1-98.6%.
2. The preparation method according to claim 1, wherein the diameter of the micro-nano cellulose is 300-450 nm.
3. The preparation method according to claim 1, wherein the oven-dry amount of the micro-nano cellulose is 3-4 wt% of the oven-dry amount of the paper pulp.
4. The preparation method according to claim 1, wherein the dispersion medium of the pulp dispersion liquid and the micro-nano cellulose dispersion liquid is water.
5. The method according to claim 1, wherein the diluted mixed slurry has a concentration of 0.2 to 1 wt%.
6. The method according to claim 1, wherein the diluent used for the dilution is water.
7. The method according to claim 1, wherein the pulp dispersion has a concentration of 3 to 4 wt%.
8. The method according to claim 1, wherein the pulp comprises any one or a combination of at least two of wood pulp, straw pulp, hemp pulp, reed pulp, cane pulp, bamboo pulp and rag pulp.
9. The method of claim 1, wherein the mixing in step (1) is conducted by defibering.
10. The method according to claim 9, wherein the fluffing is performed at 5000 to 30000 revolutions.
11. The production method according to claim 1, wherein the carbon material includes any one or a combination of at least two of a graphene material, a carbon nanotube, and carbon black.
12. The method according to claim 11, wherein the graphene material is prepared by any one or a combination of at least two of a mechanical exfoliation method, a redox method, a thermal cracking method, an intercalation exfoliation method, a chemical vapor deposition method, a liquid phase exfoliation method, and a biomass hydrothermal carbonization method.
13. The method of claim 11, wherein the carbon nanotubes comprise single-walled carbon nanotubes and/or multi-walled carbon nanotubes.
14. The production method according to claim 11, wherein the carbon black includes any one or a combination of at least two of rubber carbon black, pigment carbon black, conductive carbon black and special carbon black.
15. The preparation method according to any one of claims 1 to 14, wherein the preparation method of the micro-nano cellulose dispersion comprises the following steps:
(1) dispersing a cellulose raw material in water to obtain a raw material dispersion liquid;
(2) and homogenizing the raw material dispersion liquid to obtain the micro-nano cellulose dispersion liquid.
16. The method of claim 15, wherein the dispersing comprises sanding.
17. The preparation method of claim 16, wherein the grain size of the zirconium beads in the sanding process is 0.8-1.5 mm, the filling rate of the zirconium beads is 50-70%, the rotation speed of the sand mill is 1000-3000 rpm, and the number of the sanding cycles is more than or equal to 1.
18. The method according to claim 15, wherein the homogenizing pressure is 60 to 150 MPa.
19. The method according to claim 18, wherein the homogenizing pressure is 100 to 130 MPa.
20. The method according to claim 15, wherein the cellulose raw material comprises any one or a combination of at least two of furfural residue, bleached wood pulp, bleached straw pulp, cotton pulp, dissolving pulp, secondary fiber, unbleached wood pulp, unbleached straw pulp and agricultural waste.
21. The production method according to claim 15, wherein the concentration of the cellulose raw material in the raw material dispersion liquid is 2 to 10 wt%.
22. The method of claim 15, wherein the cellulose content of the cellulosic feedstock is > 95 wt%.
23. A paper sheet produced by the production method according to any one of claims 1 to 22;
the paper does not contain retention aids.
24. Use of the paper obtained by the preparation method according to any one of claims 1 to 22, wherein the paper is used for packaging, filtration, decoration or printing.
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| CN110528305B (en) * | 2019-09-04 | 2021-11-09 | 齐鲁工业大学 | Preparation method of liquid crystal glass substrate spacer paper with seersucker structure |
| CN110528327B (en) * | 2019-09-12 | 2022-09-02 | 昆明纳太科技有限公司 | High-conductivity paper pulp/carbon nano tube composite paper and preparation method thereof |
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