CN117604820A - Oil-absorbing type oil-proof paper and preparation method thereof - Google Patents
Oil-absorbing type oil-proof paper and preparation method thereof Download PDFInfo
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- CN117604820A CN117604820A CN202311675168.8A CN202311675168A CN117604820A CN 117604820 A CN117604820 A CN 117604820A CN 202311675168 A CN202311675168 A CN 202311675168A CN 117604820 A CN117604820 A CN 117604820A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 36
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- 230000007704 transition Effects 0.000 claims abstract description 39
- 238000010521 absorption reaction Methods 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 25
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 20
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 3
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- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 2
- 229910021536 Zeolite Inorganic materials 0.000 claims description 2
- 125000005907 alkyl ester group Chemical group 0.000 claims description 2
- 125000005192 alkyl ethylene group Chemical group 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 2
- 235000013539 calcium stearate Nutrition 0.000 claims description 2
- 239000008116 calcium stearate Substances 0.000 claims description 2
- 239000004927 clay Substances 0.000 claims description 2
- 229910052570 clay Inorganic materials 0.000 claims description 2
- 229940087101 dibenzylidene sorbitol Drugs 0.000 claims description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
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- 238000002203 pretreatment Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000010457 zeolite Substances 0.000 claims description 2
- 239000002250 absorbent Substances 0.000 claims 3
- 244000082204 Phyllostachys viridis Species 0.000 claims 1
- 239000011121 hardwood Substances 0.000 claims 1
- 239000004519 grease Substances 0.000 abstract description 25
- 235000013305 food Nutrition 0.000 abstract description 13
- 229920002678 cellulose Polymers 0.000 abstract description 11
- 239000001913 cellulose Substances 0.000 abstract description 11
- 239000003795 chemical substances by application Substances 0.000 abstract description 7
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- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
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- 241001330002 Bambuseae Species 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
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- 239000000194 fatty acid Substances 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 239000010902 straw Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
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- 238000009792 diffusion process Methods 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 229920005610 lignin Polymers 0.000 description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
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- ODLMAHJVESYWTB-UHFFFAOYSA-N propylbenzene Chemical group CCCC1=CC=CC=C1 ODLMAHJVESYWTB-UHFFFAOYSA-N 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
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- 229920001897 terpolymer Polymers 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229920001661 Chitosan Polymers 0.000 description 1
- 229920000168 Microcrystalline cellulose Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
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- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
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- 239000002985 plastic film Substances 0.000 description 1
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- 229920001567 vinyl ester resin Polymers 0.000 description 1
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Classifications
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- 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
-
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H11/18—Highly hydrated, swollen or fibrillatable fibres
-
- 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
Landscapes
- Paper (AREA)
Abstract
The invention discloses oil-absorbing type oil-proof paper and a preparation method thereof. The method comprises the steps of firstly preparing nano-cellulose with different sizes and carboxyl contents, mixing the nano-cellulose with a fiber raw material to serve as a permeation layer raw material, mixing the nano-cellulose with the fiber raw material and an oil absorption material to serve as an oil storage layer raw material, and independently using the nano-cellulose as a transition layer and an oil prevention layer. Then sequentially spraying out by adopting a dynamic forming method to form a wet paper web, and then carrying out vacuum dehydration and drying by a dryer to obtain the oil-absorbing type oil-proof paper with the ration of 20-100g/m 2 The oil absorption of the oil absorption surface is 20-500g/m 2 The oil-proof surface kit has an oil-proof grade of 10-12 and is resistant to heat oil. The preparation method provided by the invention has simple process and can be used for large-scale production. The oil-proofing agent is oil-proofing agentThe paper can absorb the superfluous grease on the surface of the fried food, reduce the feeding amount of the grease, has excellent grease-proof performance, and is suitable for packaging high-grease food such as deep-fried twisted dough sticks, french fries, fried chickens and the like.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to oil-absorbing type oil-proof paper and a preparation method thereof.
Background
Fried foods such as deep-fried twisted dough sticks, fried chicken, french fries, fried breads and the like are generally packaged with a grease-resistant paper in order to avoid staining during storage and eating. The surface of the oil-proof paper is provided with a layer of plastic film or is coated with an oil-proof agent, so that the penetration and absorption of grease can be prevented. The oil-repellent agent mainly includes fluorine-containing oil-repellent agent and non-fluorine-containing oil-repellent agent. In recent years, research has found that fluorine-containing oil-proofing agents can bring harm to human health. Therefore, non-fluorine-containing oil-repellent agents have been widely paid attention to and studied. In addition, the oil content of the fried food is high, and a layer of oil absorbing paper is usually filled under the fried food to absorb redundant grease, but the oil absorbing paper does not prevent grease, and the grease still can pollute the tableware or the container under through the oil absorbing paper. Therefore, there is a need to develop a paper which can absorb oil and prevent grease, on one hand, can prevent grease from penetrating, and can keep the appearance clean; on the other hand, by absorbing excessive grease, the intake of oil can be reduced, which is relatively healthier.
Patent CN108999024a discloses an oil-absorbing type oil-proof paper, which comprises base paper, wherein a hydrophobic oil storage layer is arranged on the base paper, the hydrophobic oil storage layer is a composite film layer formed by two compositions of a vinyl alcohol-ethylene-vinyl acetate terpolymer, a vinyl alcohol-ethylene-fatty acid vinyl ester terpolymer, cationic starch and polyvinyl alcohol and hydrophobic oil storage particles, and the hydrophobic oil storage particles are formed by coupling modification of lamellar inorganic matters and one or two of stearic acid, stearate and stearate. The mass of the oil storage layer on the base paper per square meter is 0.1-1.8g. According to the invention, grease is effectively prevented from entering the base paper through the hydrophilicity of the hydrophilic resin in the hydrophobic oil storage layer, and the base paper has the characteristics of remarkable oil absorption and grease diffusion prevention, and has a good oil-proof effect. Patent CN109056409a discloses a degradable oil-absorbing type oil-proof paper, which comprises base paper, wherein a hydrophobic oil storage layer is arranged on the base paper, the hydrophobic oil storage layer is a composite membrane layer formed by hydrophobic oil storage particles and composite resin, and the hydrophobic oil storage particles are formed by coupling and modifying inorganic matters with one or two of fatty acid, fatty acid salt and fatty acid ester; the composite resin is formed by two compositions of chitosan, carboxymethyl cellulose, sodium alginate and cationic starch and polyvinyl alcohol-microcrystalline cellulose. The mass of the oil storage layer on the base paper per square meter is 0.3-2.0g. The invention utilizes the hydrophobic oil storage layer formed by the hydrophobic oil storage particles and the composite resin, has the characteristics of remarkable oil absorption, oil diffusion resistance and degradability,the oil-proof effect is good, and can be used for packaging high-fat fried foods and the like. However, both of the oil-absorbing papers disclosed in these patents have a reservoir mass of 2.0g/m 2 In the past, the absorption capacity of grease is very limited, and the oil absorption and prevention performance mainly depends on the coating, so that the base paper cannot absorb or prevent oil.
Therefore, how to improve the oil absorption and the oil resistance of the base paper is a technical problem to be solved in the technical field of oil absorption type oil-proof paper.
Disclosure of Invention
The invention aims to provide oil-absorbing type oil-proof paper and a preparation method thereof. The oil-absorbing type oil-proof paper can be prepared through a paper making process, surface coating is not needed, oil absorption and oil proofing effects can be achieved only by a base paper material, the oil absorption is large, the kit oil-proof level is high, and the oil-proof paper is resistant to hot oil.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an oil-absorbing type oil-proof paper and a preparation method thereof are characterized by comprising the following steps:
(1) Preparation of nanocellulose: mechanically dissociating the fiber raw material P1 to obtain nano cellulose N1, chemically pre-treating the fiber raw material P2 and mechanically dissociating the fiber raw material P2 to obtain nano cellulose N2, and further dissociating the N2 to obtain nano cellulose N3;
(2) Raw material preparation: mixing and diluting a fiber raw material P3 and nano cellulose N1 according to a certain proportion to obtain a permeation layer raw material, mixing and diluting the fiber raw material P3 and an oil absorption material and nano cellulose N2 according to a certain proportion to obtain an oil storage layer raw material, diluting the nano cellulose N2 to obtain a transition layer raw material, and diluting the nano cellulose N3 to obtain an oil-proof layer raw material;
(3) And (5) forming by papermaking: sequentially spraying the permeable layer raw material, the oil storage layer raw material, the transition layer raw material and the oil-proof layer raw material by adopting a dynamic paper sheet former at a certain drum speed and under a certain rotary spraying pressure to form a wet paper sheet, and then carrying out vacuum dehydration and drying by a drying cylinder to obtain the oil-proof paper capable of absorbing oil;
the obtained oil-absorbing oil can absorb oilThe oil-proof paper comprises a permeation layer, an oil storage layer, a transition layer and an oil-proof layer, and has a weight of 20-100g/m 2 Wherein the osmotic layer is 2-5g/m 2 The oil reservoir occupies 16.5 to 91g/m 2 The transition layer occupies 1g/m to 3g/m 2 The oil-proof layer is 0.5-1g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the One side of the oil-proof paper absorbs oil, and the oil absorption is 20-500g/m 2 The other side was oil-repellent, kit oil-repellent rated 10-12, and the hot oil droplets were impermeable after 10 minutes on the surface.
The fiber raw material P1 is bleached or unbleached needle pulp, and the fiber raw material P2 is bleached or unbleached broadleaf pulp; the average diameter of the nano cellulose N1 fiber is 500-1000nm, and the average length is 100-500 mu m; the average diameter of the nano cellulose N2 fiber is 200-500nm, the average length is 100-500 mu m, and the carboxyl content is 0.6-1.0mmol/g; the average diameter of the nano cellulose N3 fiber is 10-100nm, the average length is 1-10 mu m, and the carboxyl content is 1.2-2.0mmol/g.
The mechanical dissociation equipment adopted by the nanocellulose N1 comprises: one or more of a conical refiner, a cylindrical refiner, a disc refiner and a high-consistency refiner; the chemical pretreatment method adopted by the nanocellulose N2 and the nanocellulose N3 is one of a TEMPO oxidation method, a carboxymethylation method and a carboxyethylation method, and the adopted dissociation mechanical equipment comprises: one or more combinations of disc mills, fine mills, ball mills, high pressure homogenizers.
The fiber raw material P3 is one or a combination of a plurality of unbleached broad-leaved wood machine pulp, bamboo machine pulp, wheat straw pulp, reed pulp and sugarcane pulp; the oil absorbing material is one or a combination of more of wood dust, talcum powder, clay, calcium carbonate, silicon dioxide, zeolite, dibenzylidene sorbitol, magnesium stearate, calcium stearate, polypropylene fiber, polyethylene fiber, polyester fiber, alkyl ethylene polymer fiber, methyl acrylic acid long chain alkyl ester fiber and polyurethane foam particles.
The mass ratio of each component of the permeable layer is as follows: 95-99% of P3, 1-5% of N1, 100% of the sum of the mass percentages of the components, and 0.1-0.5% of dilution mass concentration; the mass ratio of each component of the oil reservoir is as follows: 30-68% of P3, 30-50% of oil absorption material, 2-10% of N2, 100% of the sum of the mass percentages of the components, and 0.1-1.0wt% of dilution concentration; the dilution concentration of the transition layer N2 is 0.05-0.2wt%; the dilution concentration of the oil-proof layer N3 is 0.05-0.3wt%.
The speed of the rotary drum is 800-1500m/min, and the rotary spraying pressure is 0.1-0.3Mpa. The drying temperature is 80-120deg.C, and the drying time is 1-10min.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the oil-absorbing type oil-proof paper and the preparation method thereof provided by the invention are manufactured by dynamic forming without surface sizing or surface coating process, have simple process, can be amplified to be operated on a paper machine with multi-layer net forming, and are suitable for mass production. The oil-absorbing type oil-proof paper obtained by the method has one oil absorption surface and the other oil absorption surface, and the oil absorption is 20-500g/m 2 The kit oil-proof grade is 10-12 grade, and has heat oil resistance.
2. According to the oil-absorbing type oil-proof paper and the preparation method thereof, the oil-absorbing type oil-proof paper is composed of the permeable layer, the oil storage layer, the transition layer and the oil-proof layer, and the oil absorption and oil-proof performances can be regulated and controlled by regulating the content and the proportion of each layer of the oil-absorbing type oil-proof paper, so that the packaging requirements of different fried foods can be met. The oil absorbing surface can absorb the excessive grease of the fried food, reduce the feeding amount of the grease and is relatively healthier. The oil-proof surface can prevent grease from penetrating and keep the container or hands clean.
3. According to the oil-absorbing type oil-proof paper and the preparation method thereof, the main raw material P3 adopted by the permeable layer of the oil-absorbing type oil-proof paper is one or a combination of a plurality of unbleached broad-leaf lignification machine pulp, bamboo lignification machine pulp, wheat straw pulp, reed pulp and sugarcane pulp, the lignin content in the raw material is high, and lipophilic groups such as phenylpropane in the lignin can reduce the surface tension of grease on paper surface, so that the wetting and penetration of grease are facilitated; secondly, the paper pulp with higher lignin content is relatively stiff, and the paper after making has higher bulk and porosity, which is also beneficial to the penetration and absorption of grease; moreover, the paper made from the raw materials is yellow in color, which is helpful for distinguishing the white oil absorption surface from the visual; in addition, a small amount of slender nanocellulose N1 is added into the permeable layer in order to increase strength, and the nanocellulose in the form can not only increase hydrogen bonding between fiber raw materials, but also can not block meshes of a forming wire, and also can not reduce porosity of the permeable layer. Besides the function of facilitating grease permeation and inward absorption, the permeable layer also plays a role of isolation, so that direct contact between food and oil-absorbing materials is avoided, and meanwhile, the oil-absorbing materials are prevented from overflowing and being stained on the food, so that the oil-absorbing type oil-proof paper is safer and healthier.
4. According to the oil-absorbing type oil-proof paper and the preparation method thereof provided by the invention, the oil storage layer of the oil-absorbing type oil-proof paper is composed of the fiber raw material P3, the oil-absorbing material and the nano cellulose N2, the three-dimensional network structure formed by the fiber raw material P3 on the layer can effectively contain and disperse the oil-absorbing material, and the pores among the fibers of the oil-absorbing type oil-proof paper provide channels for further penetration and diffusion of grease. The nano cellulose N2 plays a role in reinforcing, compared with the nano cellulose N1, the nano cellulose N2 has smaller size and higher carboxyl content, is favorable for bonding the oil absorbing material and the fiber raw material P3 together, and has more remarkable reinforcing effect compared with the nano cellulose N1. The three-dimensional network structure provided by the fiber raw material P3 and the nano cellulose N2 have the bonding effect that the mass percentage of the oil absorbing material in the oil storage layer can be up to 30-50%, and the oil absorbing type and the dosage of the oil absorbing material are regulated and controlled to prepare the oil absorbing type oil-proof paper with high oil absorption.
5. According to the oil-absorbing type oil-proof paper and the preparation method thereof provided by the invention, the transition layer of the oil-absorbing type oil-proof paper is composed of the nanocellulose N2, the transition layer mainly plays a role in transition between the oil storage layer and the oil-proof layer, the nanocellulose N2 has rich hydroxyl and carboxyl hydrophilic groups, the dense network structure formed by the nanocellulose N2 can reduce the penetration of grease into the oil-proof layer, and meanwhile, the dense structure fills larger pores on the surface of the oil storage layer, so that the consumption of the oil-proof layer material is reduced.
6. According to the oil-absorbing type oil-proof paper and the preparation method thereof, the oil-proof layer of the oil-absorbing type oil-proof paper is composed of the nano cellulose N3, and compared with the nano cellulose N2, the nano cellulose N3 is smaller in size and higher in carboxyl content, so that a more compact film structure can be formed, oil permeation is blocked, the oil-proof grade is high, the oil-absorbing type oil-proof paper can absorb oil and is not permeable, and the oil-absorbing type oil-proof paper is favorable for packaging fried foods with high oil.
7. The oil-absorbing type oil-proof paper and the preparation method thereof provided by the invention adopt a dynamic paper sheet forming method to construct a four-layer structure of the oil-absorbing type oil-proof paper in the same equipment, no additional sizing or surface coating is needed in the process, and the adopted vacuum dehydration and drying cylinder drying are common methods in the papermaking industry, so that the oil-absorbing type oil-proof paper can be amplified to a paper machine with multi-layer net forming for operation, and is suitable for large-scale production.
8. According to the oil-absorbing type oil-proof paper and the preparation method thereof, two adjacent layers of the oil-absorbing type oil-proof paper are tightly combined together through hydrogen bonds formed by interweaving fibers, the layers are firmly combined, layering is avoided even if the oil-absorbing type oil-proof paper is folded and rubbed in the use process, and oil absorption and oil proofing effects are not affected. In addition, the obtained oil-absorbing type oil-proof paper can be in contact with food, is healthy and safe, can absorb redundant grease, has excellent oil-proof effect, and is suitable for packaging high-grease food such as deep-fried twisted dough sticks, fries, fried chickens and the like.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, but are not to be construed as limiting the invention. In the drawings:
fig. 1 is a schematic structural view of oil-absorbable type oil-proof paper.
The names of the parts indicated by the numerical references in the drawings are as follows: 1-permeable layer, 2-oil storage layer, 3-transition layer, 4-oil-proof layer, and 21-oil absorption material.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but is not limited thereto.
Example 1
(1) Preparation of nanocellulose: mechanically dissociating the unbleached needle pulp by a high-concentration pulp grinder to obtain nano cellulose N1, wherein the average diameter of the fiber is 800nm, and the average length is 300 mu m; carboxyethylation pretreatment is carried out on unbleached broadleaf pulp, and mechanical dissociation is carried out by a fine grinder to obtain nano cellulose N2, wherein the average diameter of the fiber is 300nm, the average length is 200 mu m, and the carboxyl content is 0.8mmol/g; further dissociating N2 by a high-pressure homogenizer to obtain nanocellulose N3, wherein the average diameter of the fiber is 100nm, the average length is 5 mu m, and the carboxyl content is 1.4mmol/g;
(2) Raw material preparation: mixing unbleached broad-leaved wood pulp and nano-cellulose N1 according to the mass ratio of 96:4 and diluting to 0.3wt% to be used as a permeation layer raw material, mixing unbleached broad-leaved wood pulp and polypropylene fiber according to the mass ratio of 48:50:2 and diluting to 0.5wt% to be used as an oil storage layer raw material, diluting nano-cellulose N2 to 0.2wt% to be used as a transition layer raw material, and diluting nano-cellulose N3 to 0.1wt% to be used as an oil-proof layer raw material;
(3) And (5) forming by papermaking: sequentially spraying the permeable layer raw material, the oil storage layer raw material, the transition layer raw material and the oil-proof layer raw material by adopting a dynamic paper sheet former at a drum speed of 1500m/min and a rotary spraying pressure of 0.2Mpa to form a wet paper sheet, and then carrying out vacuum dehydration and drying for 15min by a 105 ℃ dryer to obtain the oil-proof paper capable of absorbing oil;
the oil-absorbing type oil-proof paper consists of a permeable layer, an oil storage layer, a transition layer and an oil-proof layer, and the ration is 100g/m 2 Wherein the osmotic layer occupies 3g/m 2 The oil reservoir occupies 94g/m 2 The transition layer occupies 2g/m 2 The oil-resistant layer accounts for 1g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the One side of the oil-proof paper absorbs oil, and the oil absorption is 500g/m 2 The other side was oil-repellent, kit oil-repellent rated 12 and the hot oil droplets were impervious to 10 minutes after being placed on the surface.
Example 2
(1) Preparation of nanocellulose: mechanically dissociating the bleached needle pulp by a disc refiner to obtain nano cellulose N1, wherein the average diameter of the fiber is 500nm, and the average length is 200 mu m; the bleached broadleaf pulp is subjected to carboxymethylation pretreatment and is mechanically dissociated by a ball mill to obtain nanocellulose N2, wherein the average diameter of the fiber is 200nm, the average length of the fiber is 100 mu m, and the carboxyl content is 1.0mmol/g; further dissociating N2 by a high-pressure homogenizer to obtain nanocellulose N3, wherein the average diameter of the fiber is 60nm, the average length is 1 mu m, and the carboxyl content is 1.6mmol/g;
(2) Raw material preparation: mixing unbleached bamboo pulp and nano cellulose N1 according to the mass ratio of 95:5 and diluting to 0.4wt% to be used as a permeation layer raw material, mixing unbleached bamboo pulp, talcum powder and nano cellulose N2 according to the mass ratio of 55:40:5 and diluting to 0.3wt% to be used as an oil storage layer raw material, diluting nano cellulose N2 to 0.15wt% to be used as a transition layer raw material, and diluting nano cellulose N3 to 0.2wt% to be used as an oil-proof layer raw material;
(3) And (5) forming by papermaking: sequentially spraying the permeable layer raw material, the oil storage layer raw material, the transition layer raw material and the oil-proof layer raw material by adopting a dynamic paper sheet former at a drum speed of 1000m/min and a rotary spraying pressure of 0.1Mpa to form a wet paper sheet, and then carrying out vacuum dehydration and drying for 5min by a 105 ℃ dryer to obtain the oil-proof paper capable of absorbing oil;
the oil-absorbing type oil-proof paper consists of a permeable layer, an oil storage layer, a transition layer and an oil-proof layer, and the ration is 50g/m 2 Wherein the osmotic layer comprises 5g/m 2 The oil reservoir occupies 43g/m 2 The transition layer occupies 1g/m 2 The oil-resistant layer accounts for 1g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the One side of the oil-proof paper absorbs oil, and the oil absorption is 100g/m 2 The other side was oil-repellent, kit oil-repellent rated 12 and the hot oil droplets were impervious to 10 minutes after being placed on the surface.
Example 3
(1) Preparation of nanocellulose: mechanically dissociating the bleached needle pulp by a conical pulping machine to obtain nano cellulose N1, wherein the average diameter of the fiber is 800nm, and the average length is 300 mu m; carrying out oxidation pretreatment on unbleached broadleaf pulp TEMPO and mechanically dissociating the unbleached broadleaf pulp by a disc grinder to obtain nano cellulose N2, wherein the average diameter of the fiber is 400nm, the average length is 200 mu m, and the carboxyl content is 0.9mmol/g; further dissociating N2 by a ball mill to obtain nano cellulose N3, wherein the average diameter of the fiber is 80nm, the average length is 2 mu m, and the carboxyl content is 1.8mmol/g;
(2) Raw material preparation: mixing unbleached wheat straw pulp and nano cellulose N1 according to the mass ratio of 97:3 and diluting to 0.3wt% to be used as a permeation layer raw material, mixing unbleached wheat straw pulp, magnesium stearate and nano cellulose N2 according to the mass ratio of 62:35:3 and diluting to 0.2wt% to be used as an oil storage layer raw material, diluting nano cellulose N2 to 0.1wt% to be used as a transition layer raw material, and diluting nano cellulose N3 to 0.1wt% to be used as an oil-proof layer raw material;
(3) And (5) forming by papermaking: sequentially spraying the permeable layer raw material, the oil storage layer raw material, the transition layer raw material and the oil-proof layer raw material by adopting a dynamic paper former at a drum speed of 1200m/min and a rotary spraying pressure of 0.3Mpa to form a wet paper web, and then carrying out vacuum dehydration and drying for 1min by a 110 ℃ dryer to obtain the oil-proof paper capable of absorbing oil;
the oil-absorbing type oil-proof paper consists of a permeable layer, an oil storage layer, a transition layer and an oil-proof layer, and the ration is 20g/m 2 Wherein the osmotic layer comprises 2g/m 2 The oil reservoir occupies 15g/m 2 The transition layer occupies 2g/m 2 The oil-resistant layer accounts for 1g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the One side of the oil-proof paper absorbs oil, and the oil absorption is 50g/m 2 The other side was oil-repellent, kit oil-repellent rated 12 and the hot oil droplets were impervious to 10 minutes after being placed on the surface.
Example 4
(1) Preparation of nanocellulose: mechanically dissociating the unbleached needle pulp by a cylindrical pulping machine to obtain nano cellulose N1, wherein the average diameter of the fiber is 600nm, and the average length is 500 mu m; carboxyethylation pretreatment is carried out on bleached broadleaf pulp, and the bleached broadleaf pulp is mechanically dissociated by a high-pressure homogenizer to obtain nanocellulose N2, wherein the average diameter of the fiber is 300nm, the average length is 400 mu m, and the carboxyl content is 0.6mmol/g; further dissociating N2 by a ball mill to obtain nano cellulose N3, wherein the average diameter of the fiber is 100nm, the average length is 5 mu m, and the carboxyl content is 1.2mmol/g;
(2) Raw material preparation: mixing unbleached reed pulp and nano cellulose N1 according to the mass ratio of 96:4 and diluting to 0.4wt% to be used as a permeation layer raw material, mixing unbleached reed pulp, wood dust and nano cellulose N2 according to the mass ratio of 45:45:10 and diluting to 0.3wt% to be used as an oil storage layer raw material, diluting nano cellulose N2 to 0.2wt% to be used as a transition layer raw material, and diluting nano cellulose N3 to 0.1wt% to be used as an oil-proof layer raw material;
(3) And (5) forming by papermaking: sequentially spraying the permeable layer raw material, the oil storage layer raw material, the transition layer raw material and the oil-proof layer raw material by adopting a dynamic paper sheet former at the drum speed of 1400m/min and the rotary spraying pressure of 0.2Mpa to form a wet paper sheet, and then carrying out vacuum dehydration and drying for 2min by a 120 ℃ dryer to obtain the oil-proof paper capable of absorbing oil;
the oil-absorbing type oil-proof paper consists of a permeable layer, an oil storage layer, a transition layer and an oil-proof layer, and the quantitative ratio of the oil-absorbing type oil-proof paper to the oil-proof paper is 40g/m 2 Wherein the osmotic layer occupies 3g/m 2 The oil reservoir occupies 34.5g/m 2 The transition layer occupies 2g/m 2 The oil-resistant layer accounts for 0.5g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the One side of the oil-proof paper absorbs oil, and the oil absorption is 80g/m 2 The other side was oil-repellent, kit oil-repellent rated 11 and the hot oil droplets were impervious to 10 minutes after being placed on the surface.
Example 5
(1) Preparation of nanocellulose: mechanically dissociating the bleached needle pulp by a disc refiner to obtain nano cellulose N1, wherein the average diameter of the fiber is 700nm, and the average length is 400 mu m; carrying out carboxymethylation pretreatment on unbleached broadleaf pulp and mechanically dissociating the unbleached broadleaf pulp by a fine grinder to obtain nano cellulose N2, wherein the average diameter of the fiber is 400nm, the average length of the fiber is 500 mu m, and the carboxyl content is 0.7mmol/g; further dissociating N2 through a disc grinder to obtain nanocellulose N3, wherein the average diameter of the fiber is 100nm, the average length of the fiber is 10 mu m, and the carboxyl content is 1.3mmol/g;
(2) Raw material preparation: mixing unbleached sugarcane pulp and nano cellulose N1 according to the mass ratio of 95:5 and diluting to 0.2wt% to be used as a permeation layer raw material, mixing unbleached sugarcane pulp, long-chain alkyl methacrylate fiber and nano cellulose N2 according to the mass ratio of 45:50:5 and diluting to 0.2wt% to be used as an oil storage layer raw material, diluting nano cellulose N2 to 0.1wt% to be used as a transition layer raw material, and diluting nano cellulose N3 to 0.05wt% to be used as an oil-proof layer raw material;
(3) And (5) forming by papermaking: sequentially spraying the permeable layer raw material, the oil storage layer raw material, the transition layer raw material and the oil-proof layer raw material by adopting a dynamic paper sheet former at a drum speed of 1500m/min and a rotary spraying pressure of 0.3Mpa to form a wet paper sheet, and then carrying out vacuum dehydration and drying for 5min by a 90 ℃ dryer to obtain the oil-proof paper capable of absorbing oil;
the oil-absorbing type oil-proof paper consists of a permeable layer, an oil storage layer, a transition layer and an oil-proof layer, and the ration is 60g/m 2 Wherein the osmotic layer comprises 4.5g/m 2 The oil reservoir occupies 54g/m 2 The transition layer occupies 1g/m 2 The oil-resistant layer accounts for 0.5g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the One side of the oil-proof paper absorbs oil, and the oil absorption is 300g/m 2 The other side was oil-repellent, kit oil-repellent rated 10 and the hot oil droplets were not penetrated after 10 minutes on the surface.
Example 6
(1) Preparation of nanocellulose: mechanically dissociating the unbleached needle pulp by a disc refiner to obtain nano cellulose N1, wherein the average diameter of the fiber is 500nm, and the average length is 150 mu m; carrying out TEMPO pretreatment on unbleached broad-leaved pulp and mechanically dissociating the pulp by a ball mill to obtain nano cellulose N2, wherein the average diameter of the fiber is 200nm, the average length of the fiber is 100 mu m, and the carboxyl content is 0.9mmol/g; further dissociating N2 by a high-pressure homogenizer to obtain nanocellulose N3, wherein the average diameter of the fiber is 10nm, the average length is 2 mu m, and the carboxyl content is 1.9mmol/g;
(2) Raw material preparation: mixing unbleached broad-leaved wood pulp and nano-cellulose N1 according to the mass ratio of 96:4 and diluting to 0.1wt% to be used as a permeation layer raw material, mixing unbleached broad-leaved wood pulp, silicon dioxide and nano-cellulose N2 according to the mass ratio of 66:30:4 and diluting to 0.1wt% to be used as an oil storage layer raw material, diluting nano-cellulose N2 to 0.1wt% to be used as a transition layer raw material, and diluting nano-cellulose N3 to 0.05wt% to be used as an oil-proof layer raw material;
(3) And (5) forming by papermaking: sequentially spraying the permeable layer raw material, the oil storage layer raw material, the transition layer raw material and the oil-proof layer raw material by adopting a dynamic paper sheet former at the drum speed of 1250m/min and the rotary spraying pressure of 0.2Mpa to form a wet paper sheet, and then carrying out vacuum dehydration and drying for 7min by a drying cylinder at 80 ℃ to obtain the oil-proof paper capable of absorbing oil;
the oil-absorbing type oil-proof paper consists of a permeable layer, an oil storage layer, a transition layer and an oil-proof layer, and the quantitative ratio is 80g/m 2 Wherein the osmotic layer comprises 4.8g/m 2 The oil reservoir occupies 74g/m 2 The transition layer occupies 1g/m 2 The oil-resistant layer accounts for 0.5g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the One side of the oil-proof paper absorbs oil, and the oil absorption is 140g/m 2 The other side was oil-repellent, kit oil-repellent rated 11 and the hot oil droplets were impervious to 10 minutes after being placed on the surface.
The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this invention will occur to those skilled in the art, and are intended to be within the spirit and scope of the invention.
Claims (6)
1. An oil-absorbing type oil-proof paper and a preparation method thereof are characterized by comprising the following steps:
(1) Preparation of nanocellulose: mechanically dissociating the fiber raw material P1 to obtain nano cellulose N1, chemically pre-treating the fiber raw material P2 and mechanically dissociating the fiber raw material P2 to obtain nano cellulose N2, and further dissociating the N2 to obtain nano cellulose N3;
(2) Raw material preparation: mixing and diluting a fiber raw material P3 and nano cellulose N1 according to a certain proportion to obtain a permeation layer raw material, mixing and diluting the fiber raw material P3 and an oil absorption material and nano cellulose N2 according to a certain proportion to obtain an oil storage layer raw material, diluting the nano cellulose N2 to obtain a transition layer raw material, and diluting the nano cellulose N3 to obtain an oil-proof layer raw material;
(3) And (5) forming by papermaking: sequentially spraying the permeable layer raw material, the oil storage layer raw material, the transition layer raw material and the oil-proof layer raw material by adopting a dynamic paper sheet former at a certain drum speed and under a certain rotary spraying pressure to form a wet paper sheet, and then carrying out vacuum dehydration and drying by a drying cylinder to obtain the oil-proof paper capable of absorbing oil;
the oil-absorbing type oil-proof paper comprises a permeable layer, an oil storage layer, a transition layer and an oil-proof layer, and has a quantitative ratio of 20-100g/m 2 Wherein the osmotic layer is 2-5g/m 2 The oil reservoir occupies 16.5 to 91g/m 2 The transition layer occupies 1g/m to 3g/m 2 The oil-proof layer is 0.5-1g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the One side of the oil-proof paper absorbs oil, and the oil absorption is 20-500g/m 2 Oil is prevented from being discharged from the other surface, the kit oil-proof grade is 10-12, and hot oil drops are separated from the surface by 10 minutesImpermeable after the clock.
2. The oil-absorbent paper and the preparation method thereof according to claim 1, wherein in the step (1), the fiber raw material P1 is bleached or unbleached needle pulp, and the fiber raw material P2 is bleached or unbleached broadleaf pulp; the average diameter of the nano cellulose N1 fiber is 500-1000nm, and the average length is 100-500 mu m; the average diameter of the nano cellulose N2 fiber is 200-500nm, the average length is 100-500 mu h, and the carboxyl content is 0.6-1.0mmol/g; the average diameter of the nano cellulose N3 fiber is 10-100nm, the average length is 1-10 mu m, and the carboxyl content is 1.2-2.0mmol/g.
3. The oil-absorbent paper and the method for preparing the same according to claim 1, wherein the mechanical dissociation device for nanocellulose N1 in step (1) comprises: one or more of a conical refiner, a cylindrical refiner, a disc refiner and a high-consistency refiner; the chemical pretreatment method adopted by the nanocellulose N2 and the nanocellulose N3 is one of a TEMPO oxidation method, a carboxymethylation method and a carboxyethylation method, and the adopted dissociation mechanical equipment comprises: one or more combinations of disc mills, fine mills, ball mills, high pressure homogenizers.
4. The oil-absorbent paper and the preparation method thereof according to claim 1, wherein the fiber raw material P3 in the step (2) is one or a combination of a plurality of unbleached hardwood pulp, bamboo pulp, wheat pulp, reed pulp and sugarcane pulp; the oil absorbing material is one or a combination of more of wood dust, talcum powder, clay, calcium carbonate, silicon dioxide, zeolite, dibenzylidene sorbitol, magnesium stearate, calcium stearate, polypropylene fiber, polyethylene fiber, polyester fiber, alkyl ethylene polymer fiber, methyl acrylic acid long chain alkyl ester fiber and polyurethane foam particles.
5. The oil-absorbing and oil-proof paper and the preparation method thereof according to claim 1, wherein the permeable layer in the step (2) comprises the following components in mass ratio: 95-99% of P3, 1-5% of N1, 100% of the sum of the mass percentages of the components, and 0.1-0.5% of dilution mass concentration; the mass ratio of each component of the oil reservoir is as follows: 30-68% of P3, 30-50% of oil absorption material, 2-10% of N2, 100% of the sum of the mass percentages of the components, and 0.1-1.0wt% of dilution concentration; the dilution concentration of the transition layer N2 is 0.05-0.2wt%; the dilution concentration of the oil-proof layer N3 is 0.05-0.3wt%.
6. The oil-absorbing and oil-proof paper and the preparation method thereof according to claim 1, wherein the drum speed in the step (3) is 800-1500m/min, and the rotary spraying pressure is 0.1-0.3Mpa. The drying temperature is 80-120deg.C, and the drying time is 1-10min.
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