CN114892449A - Preparation method of fluorine-free antibacterial oilproof paper - Google Patents
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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
- D21H27/10—Packing paper
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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
- 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
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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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
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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
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
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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
- 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
-
- 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
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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
- 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
- D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a preparation method of fluoride-free antibacterial oil-proof paper. The oil-proof paper prepared by the invention has no fluorine oil-proof substance, has non-toxic, antibacterial and oil-proof effects, and is convenient to obtain the coating and low in cost.
Description
Technical Field
The invention relates to the technical field of oil-proof paper, in particular to a preparation method of fluorine-free antibacterial oil-proof paper.
Background
The oil-proof paper is paper for preventing oil absorption and penetration, and is mainly prepared by internal sizing and surface coating of an oil-proof agent. The oil-proof paper is mainly used as a packaging material containing substances, and particularly comprises bread, cream, fried food, hamburger and the like in the aspect of food. Oil-repellent agents containing fluorine-based surfactants have good oil-repellent properties and water resistance and are therefore often used as oil-repellent coatings for paper. Along with the continuous progress of society and the continuous improvement of human living standard, human attaches more and more importance to the problems of environmental protection and food health, and the fluorine-free oil-proof paper and the degradable oil-proof paper are concerned more and more. Under severe epidemic conditions, the demand of antibacterial packaging materials is further increasing, and especially packaging materials for food have raised higher requirements on antibacterial effect. Therefore, the preparation of the fluorine-free, antibacterial and biodegradable oil-proof paper by a simple process is of great significance.
Disclosure of Invention
The invention aims to provide a preparation method of fluorine-free antibacterial oilproof paper. The oil-proof paper prepared by the invention has no fluorine oil-proof substance, has non-toxic, antibacterial and oil-proof effects, and is convenient to obtain the coating and low in cost.
The technical scheme of the invention is as follows: a preparation method of fluorine-free antibacterial oilproof paper is characterized by comprising the following steps: firstly, surface coating is carried out on base paper by using a chitosan solution, single-layer coating oilproof paper is obtained through drying and calendaring treatment, then secondary coating is carried out on the single-layer coating oilproof paper by using a zein solution, and a finished product is obtained through drying and calendaring treatment.
According to the preparation method of the fluorine-free antibacterial oilproof paper, the mass concentration of the chitosan solution is 0.2-3%.
In the preparation method of the fluorine-free antibacterial oilproof paper, the chitosan solution is prepared by adding chitosan into an acetic acid solution with a volume fraction of 1%, and then stirring for 0.5-2 h.
In the preparation method of the fluorine-free antibacterial oilproof paper, the mass concentration of the zein solution is 1-5%.
In the preparation method of the fluorine-free antibacterial oilproof paper, the zein solution is prepared by dissolving zein in an ethanol solution with a volume fraction of 80%, and then stirring for 20-40 min.
In the preparation method of the fluorine-free antibacterial oilproof paper, the base paper is prepared by mixing the nano cellulose suspension and the paper pulp fibers, and then making the paper with a quantitative content of 20-60g/m 2 The handsheet is pressed and dried to obtain base paper, wherein the dosage of the nano-cellulose is 1-20% of the quantitative amount of the finished paper.
The preparation method of the fluorine-free antibacterial oilproof paper comprises the steps of soaking pulp in citric acid-sodium citrate buffer solution with the pH value of 5.2 to obtain pulp mixed solution with the fiber mass fraction of 3-8%, treating the pulp mixed solution with endoglucanase, stirring the pulp mixed solution with the enzyme dosage of 1-5mg per gram at the temperature of 40-60 ℃ for 0.5-2h, inactivating, diluting until the fiber mass fraction is 1%, performing high-pressure homogenization treatment at the pressure of 5000-20000psi, and performing cyclic homogenization for 1-10 times to obtain the nano-cellulose suspension.
In the preparation method of the fluorine-free antibacterial oilproof paper, the coating weight of the chitosan solution is 0.5-5g/m 2 The calendering temperature of drying and calendering after coating is 100-200 ℃ and the pressure is 10-30 psi.
In the preparation method of the fluorine-free antibacterial oilproof paper, the coating weight of the zein solution is 0.5-5g/m 2 The calendering temperature of the drying and calendering after coating is 20-60 ℃, and the pressure is 10-30 psi.
Compared with the prior art, the raw paper is coated by taking the chitosan solution and the zein solution as coating raw materials, and fluorine-containing oil-proof substances are not used in the coating raw materials and the preparation process, so that the prepared fluorine-free oil-proof substance of the oil-proof paper has the effects of no toxicity, antibiosis and oil resistance, and the oil-proof paper product is safer. In addition, the preparation process of the coating is simpler, and in addition, the chitosan, nano-cellulose and alcohol soluble protein composite coating endows the oil-proof paper with good antibacterial, mechanical strength and oil-proof and water-proof effects, thereby providing favorable conditions for the application of the oil-proof paper in the field of food packaging. The preparation of the nano-cellulose in the base paper adopts an optimal method, so that the nano-cellulose can be well dispersed, and the nano-cellulose enters the base paper to enhance the antibacterial property and the mechanical strength of the base paper. The coating used by the invention is fluorine-free, degradable and renewable biomass material, and the prepared oil-proof paper has excellent antibacterial and oil-proof effects and can be used in the fields of food, medicine packaging and the like.
Detailed Description
The following examples further illustrate the invention but are not to be construed as limiting the invention.
Example 1: a preparation method of fluoride-free antibacterial oil-proof paper comprises the steps of firstly using a chitosan solution with the mass concentration of 3% to carry out surface coating on base paper, carrying out drying and press polishing treatment to obtain single-layer coated oil-proof paper, then using a zein solution with the mass concentration of 5% to carry out secondary coating on the single-layer coated oil-proof paper, and carrying out drying and press polishing treatment to obtain a finished product. The chitosan solution is prepared by adding chitosan into acetic acid solution with volume fraction of 1%, and then stirring for 1 h. The zein solution is prepared by dissolving zein in 80% ethanol solution, and stirring for 30 min. The coating weight of the chitosan solution is 3g/m 2 The calendering temperature after coating and dry calendering was 150 ℃ and the pressure was 20 psi. The coating weight of the zein solution is 3g/m 2 The calendering temperature after coating and dry calendering was 40 ℃ and the pressure was 20 psi. In the embodiment, the national standard GB/T22805.2-2008 is adopted to detect the oilproof paper, and the oil resistance grade of the detection result is 11 grade.
Example 2: fluorine-free antibacterial oilproof paperThe preparation method comprises the steps of firstly coating the surface of base paper by using a chitosan solution with the mass concentration of 0.5%, drying and press polishing to obtain single-layer coated oilproof paper, then coating the single-layer coated oilproof paper for the second time by using a zein solution with the mass concentration of 4%, and drying and press polishing to obtain a finished product. The chitosan solution is prepared by adding chitosan into acetic acid solution with volume fraction of 1%, and then stirring for 1 h. The zein solution is prepared by dissolving zein in 80% ethanol solution, and stirring for 30 min. The coating weight of the chitosan solution is 5g/m 2 The calendering temperature after coating and dry calendering was 180 ℃ and the pressure was 25 psi. The coating weight of the zein solution is 4g/m 2 The calendering temperature after coating and drying calendering was 50 ℃ and the pressure was 15 psi. In the embodiment, the national standard GB/T22805.2-2008 is adopted to detect the oilproof paper, and the oil resistance grade of the detection result is 12 grade.
Example 3: a preparation method of fluorine-free antibacterial oilproof paper comprises the steps of firstly using a chitosan solution with the mass concentration of 1% to carry out surface coating on base paper, carrying out drying and press polishing treatment to obtain single-layer coated oilproof paper, then using a zein solution with the mass concentration of 2% to carry out secondary coating on the single-layer coated oilproof paper, and carrying out drying and press polishing treatment to obtain a finished product. The chitosan solution is prepared by adding chitosan into acetic acid solution with volume fraction of 1%, and then stirring for 1 h. The zein solution is prepared by dissolving zein in 80% ethanol solution, and stirring for 30 min. The coating weight of the chitosan solution is 5g/m 2 The calendering temperature after coating and dry calendering was 180 ℃ and the pressure was 25 psi. The coating weight of the zein solution is 4g/m 2 The calendering temperature after coating and drying calendering was 50 ℃ and the pressure was 15 psi. In the embodiment, the national standard GB/T22805.2-2008 is adopted to detect the oilproof paper, and the oil resistance grade of the detection result is 12 grade.
Example 4 a method of making a fluorine-free antimicrobial oilproof paper: the method comprises the following steps:
(1) adding 1g of chitosan into 100mL of acetic acid solution with volume fraction of 1%, and stirring for 1h to obtain chitosan solution with chitosan concentration of 1%.
(2) Dissolving 1g of zein in 100mL of 80% ethanol solution by volume fraction, and stirring for 30min to obtain a zein solution with the mass fraction of 1%.
(3) Soaking the pulp in a citric acid-sodium citrate buffer solution with the pH value of 5.2, wherein the mass fraction of the fiber is 5%, treating the pulp by using endoglucanase with the enzyme dosage of 2mg/g (mass ratio to the pulp mixed solution), and stirring for 1h at the temperature of 50 ℃. And (3) diluting the inactivated nano-cellulose to obtain a suspension with the fiber mass fraction of 1%, then performing high-pressure homogenization treatment with the pressure of 10000psi, and circularly homogenizing for 5 times to obtain the nano-cellulose suspension.
(4) According to the following steps of 1: 9 the nano-cellulose and the pulp fiber are mixed according to the proportion, and the papermaking quantitative amount is 40g/m 2 The handsheet of (1) was pressed and dried to obtain a base paper.
(5) Coating the chitosan solution on the surface of base paper with the coating weight of 1g/m 2 And obtaining the single-layer coated oil-proof paper. And calendering the chitosan single-coating oilproof paper by using a calender, wherein the calendering temperature is 100 ℃, and the pressure is 10psi, so as to obtain the calendered single-coating oilproof paper.
(6) Performing secondary coating on the surface of the single-coating oilproof paper obtained in the step (5) by using a zein solution, wherein the coating weight is 1g/m 2 And obtaining the double-layer coated oil-proof paper. And (3) calendering the double-layer coated oilproof paper by using a calender, wherein the calendering temperature is 20 ℃, and the pressure is 10psi, so that the oilproof paper with excellent antibacterial and oilproof effects is obtained.
The oilproof paper is detected by using the national standard GB/T22805.2-2008, and the oil resistance grade of the measured result of the oilproof paper in the embodiment is 11.
Example 5: a preparation method of fluorine-free antibacterial oilproof paper comprises the following steps: the method comprises the following steps:
(1) adding 1g of chitosan into 100mL of acetic acid solution with volume fraction of 1%, and stirring for 1h to obtain chitosan solution with chitosan concentration of 1%.
(2) Dissolving 2g of zein in 100mL of 80% ethanol solution by volume fraction, and stirring for 30min to obtain a zein solution with the mass fraction of 2%.
(3) The pulp is taken to be soaked in citric acid-sodium citrate buffer solution with the pH value of 5.2, the mass fraction of the fiber is 5 percent, the pulp is treated by endoglucanase, the dosage of the endoglucanase is 5mg/g (mass ratio to the pulp), and the pulp is stirred for 1 hour at the temperature of 50 ℃. And (3) diluting the inactivated nano-cellulose to a suspension with the fiber mass fraction of 1%, and then performing high-pressure homogenization treatment at the pressure of 20000psi for 5 times to obtain the nano-cellulose suspension.
(4) According to the following steps of 1: 9 the nano-cellulose and the paper pulp fiber are mixed according to the proportion, and the papermaking quantitative rate is 40g/m 2 The handsheet of (1) was pressed and dried to obtain a base paper.
(5) Coating the chitosan solution on the surface of base paper with the coating weight of 1g/m 2 And obtaining the single-layer coated oil-proof paper. And calendering the chitosan single-coating oilproof paper by using a calender, wherein the calendering temperature is 150 ℃ and the pressure is 20psi, so as to obtain the calendered single-coating oilproof paper.
(6) Performing secondary coating on the surface of the single-coating oilproof paper obtained in the step (5) by using a zein solution, wherein the coating weight is 2g/m 2 And obtaining the double-layer coated oil-proof paper. And (3) calendering the double-layer coated oilproof paper by using a calender, wherein the calendering temperature is 50 ℃ and the pressure is 20psi, so that the oilproof paper with excellent antibacterial and oilproof effects is obtained.
The oil-proof paper is detected by adopting the national standard GB/T22805.2-2008, and the oil-proof grade of the detection result is 12 grade.
Example 6: a preparation method of fluorine-free antibacterial oilproof paper comprises the following steps: the method comprises the following steps:
(1) adding 1g of chitosan into 100mL of acetic acid solution with volume fraction of 1%, and stirring for 1h to obtain chitosan solution with chitosan concentration of 1%.
(2) Dissolving 2g of zein in 100mL of 80% ethanol solution by volume fraction, and stirring for 30min to obtain a zein solution with the mass fraction of 2%.
(3) Soaking the pulp in citric acid-sodium citrate buffer solution with pH of 5.2 to obtain fiber with mass fraction of 5%, treating the pulp with endoglucanase with enzyme amount of 5mg/g (by mass ratio to the pulp), and stirring at 50 deg.C for 1 hr. And (3) diluting the inactivated nano-cellulose to a suspension with the fiber mass fraction of 1%, and then performing high-pressure homogenization treatment at the pressure of 20000psi for 10 times of circulating homogenization to obtain the nano-cellulose suspension.
(4) According to the following steps: 8, mixing the nano-cellulose and the paper pulp fibers in proportion, and making the basis weight of the mixture to be 60g/m 2 The handsheet of (1) was pressed and dried to obtain a base paper.
(5) Coating the chitosan solution on the surface of base paper, wherein the coating weight is 2g/m 2 And obtaining the single-layer coated oil-proof paper. And calendering the chitosan single-coating oilproof paper by using a calender, wherein the calendering temperature is 150 ℃ and the pressure is 20psi, so as to obtain the calendered single-coating oilproof paper.
(6) Performing secondary coating on the surface of the single-coating oilproof paper obtained in the step (5) by using a zein solution, wherein the coating weight is 2g/m 2 And obtaining the double-layer coated oil-proof paper. And (3) calendering the double-layer coated oilproof paper by using a calender, wherein the calendering temperature is 50 ℃ and the pressure is 20psi, so that the oilproof paper with excellent antibacterial and oilproof effects is obtained.
The oilproof paper is detected by using the national standard GB/T22805.2-2008 'determination of the grease resistance of paper and paperboard', and the oil resistance grade of the determination result is 12 grade.
Comparative example: conventional grease-proof paper.
Further, in order to verify the antibacterial effect of the oil-proof paper prepared by the invention, an antibacterial test is carried out by using the national standard GB/T21510-2008 'detection method for antibacterial performance of nano inorganic materials', and the results are shown in the following table:
TABLE 1
As can be seen from the above table, the antibacterial oil-proof paper prepared by the invention has better antibacterial and antibacterial effects than the common oil-proof paper in the comparative example, because chitosan is a natural polysaccharide substance and has antibacterial broad spectrum. One of the antibacterial mechanisms is that the chitosan forms polycation natural macromolecules after being protonated, and the polycation natural macromolecules can be covalently connected with negatively charged bacterial cell walls, so that the passage of ions passing through the outer layer surface is influenced, and cells cannot carry out normal metabolism. Secondly, chitosan can penetrate through multiple layers of bacterial cell walls and cytoplasmic membranes, combines with DNA to organize DNA transcription and interrupt the synthesis of mRNA and protein, destroys the metabolism of cells and leads to apoptosis. The chitosan, nano-cellulose and alcohol soluble protein composite coating in the preparation process of the coating endows the oil-proof paper with good antibacterial, mechanical strength and oil-proof and water-proof effects, and provides favorable conditions for the application of the oil-proof paper in the field of food packaging. According to the food paper prepared by blending the nano-cellulose and the paper pulp fibers, due to the addition of the nano-cellulose, a gap structure formed by cross winding of large fibers is reduced, and the roughness of the surface of the paper is improved. And then the chitosan is coated and calendered to further fill a gap structure, so that the surface of the paper is smoother, and the chitosan has good film-forming property and is a natural oil-proof material, so that the obtained food paper has a good oil-proof effect. However, the chitosan macromolecular chain has hydrophilic amino and hydroxyl, so that the water-proof effect of the food paper is poor if only the chitosan coating is used, and the zein is plant protein which is insoluble in water and has good film-forming property, so that the food paper prepared by combining the zein coating has good oil-proof and water-proof effects. The preparation of the nano-cellulose in the base paper adopts an optimal method, so that the nano-cellulose can be well dispersed, and the nano-cellulose enters the base paper to enhance the antibacterial property and the mechanical strength of the base paper. The coating used by the invention is fluorine-free, degradable and renewable biomass material, and the prepared oil-proof paper has excellent antibacterial and oil-proof effects and can be used in the fields of food, medicine packaging and the like.
Claims (9)
1. A preparation method of fluorine-free antibacterial oilproof paper is characterized by comprising the following steps: firstly, surface coating is carried out on base paper by using a chitosan solution, single-layer coating oilproof paper is obtained through drying and calendaring treatment, then secondary coating is carried out on the single-layer coating oilproof paper by using a zein solution, and a finished product is obtained through drying and calendaring treatment.
2. The method for preparing the fluorine-free antibacterial oilproof paper according to claim 1, characterized in that: the mass concentration of the chitosan solution is 0.2-3%.
3. The method for preparing the fluorine-free antibacterial oilproof paper according to claim 2, characterized in that: the chitosan solution is prepared by adding chitosan into 1% acetic acid solution by volume fraction, and then stirring for 0.5-2 h.
4. The method for preparing the fluorine-free antibacterial oilproof paper according to claim 1, characterized in that: the mass concentration of the zein solution is 1-5%.
5. The method for preparing the fluorine-free antibacterial oilproof paper according to claim 4, characterized in that: the zein solution is prepared by dissolving zein in 80% ethanol solution, and stirring for 20-40 min.
6. The method for preparing the fluorine-free antibacterial oilproof paper according to claim 1, characterized in that: the base paper is prepared by mixing nano cellulose suspension with paper pulp fibers, and then making paper with a fixed quantity of 20-60g/m 2 The handsheet is pressed and dried to obtain base paper, wherein the dosage of the nano-cellulose is 1-20% of the quantitative amount of the finished paper.
7. The method for preparing the fluorine-free antibacterial oilproof paper according to claim 6, characterized in that: the preparation method of the nano-cellulose suspension comprises the steps of soaking pulp in citric acid-sodium citrate buffer solution with the pH value of 5.2 to obtain pulp mixed solution with the fiber mass fraction of 3-8%, treating the pulp mixed solution by using endoglucanase, wherein the enzyme dosage in each gram of the pulp mixed solution is 1-5mg, stirring for 0.5-2h at the temperature of 40-60 ℃, inactivating, diluting until the fiber mass fraction is 1%, performing high-pressure homogenization treatment at the pressure of 5000-20000psi, and circularly homogenizing for 1-10 times to obtain the nano-cellulose suspension.
8. The method for preparing the fluorine-free antibacterial oilproof paper according to claim 1, characterized in that: the coating weight of the chitosan solution is 0.5-5g/m 2 The calendering temperature of drying and calendering after coating is 100-200 ℃ and the pressure is 10-30 psi.
9. The method for preparing the fluorine-free antibacterial oilproof paper according to claim 1, characterized in that: the coating weight of the zein solution is 0.5-5g/m 2 The calendering temperature of the drying and calendering after coating is 20-60 ℃, and the pressure is 10-30 psi.
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