CN114808543A - Preparation method of high-performance food oil-proof paper base material containing nano-fibril cellulose composite coating - Google Patents
Preparation method of high-performance food oil-proof paper base material containing nano-fibril cellulose composite coating Download PDFInfo
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- CN114808543A CN114808543A CN202210337733.9A CN202210337733A CN114808543A CN 114808543 A CN114808543 A CN 114808543A CN 202210337733 A CN202210337733 A CN 202210337733A CN 114808543 A CN114808543 A CN 114808543A
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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
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
- D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
- D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
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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
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/34—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising cellulose or derivatives thereof
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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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Abstract
The invention discloses a preparation method of a high-performance food oil-proof paper-based material containing a nanofibril cellulose composite coating, which comprises the following steps: (1) a nanofibrillar cellulose suspension prepared by a Tempo oxidative homogenization method; (2) adding propylene glycol alginate into water, and uniformly mixing to obtain a propylene glycol alginate solution with the mass volume percentage concentration of 1-2%; (3) 1-3% of nanocellulose suspension by mass volume percentage and 1-2% of propylene glycol alginate solution by mass percentage according to the mass ratio of nanofibril cellulose to propylene glycol alginate of 1: 1-3, uniformly stirring, dispersing for 10-20min under ultrasonic waves, and removing bubbles to obtain a coating with good dispersibility; (4) uniformly coating the coating liquid on the surface of the food packaging base paper; (5) and fully drying the coated paper at room temperature to obtain the food oil-resistant packaging paper. The invention can simultaneously improve the oil resistance, the mechanical property and the barrier property of paper.
Description
(I) technical field
The invention belongs to the technical field of packaging paper, and particularly relates to a preparation method of an oil-proof food paper base material.
(II) technical background
The oil-proof paper is used for preventing oil on food outer packages, and with the development of economy, the problem of food safety is not slow, so that the packaging paper safety problem closely related to food is solved. Ordinary paper is piled up by vegetable cellulose fibre and forms, and cellulose itself is oleophylic, and the surface tension of cellulose is far greater than the surface tension of oil for grease can soak the cellulose, and has a large amount of holes between fibre and the fibre, and grease can permeate through paper through capillary action, therefore ordinary paper does not have grease proofing performance. The oil-proof paper can be simply understood as a paper obtained by coating common paper with an oil-proof coating, and can be used as food packaging paper for resisting oil penetration, such as cake paper, McDongkenkedlike hamburger packaging paper and the like.
Patent CN106368047A discloses a biopolymer type oil-proof paper prepared from sodium alginate and isolated soy protein, which has good oil-proof performance. However, these biopolymers are very hydrophilic, which limits the use of grease-proof papers. Patent CN112982028A discloses a preparation method of biodegradable hydrophobic oil-proof paper, which comprises slowly adding nano microfibril and micro-nano bamboo powder into polyvinyl alcohol solution, dispersing and ultrasonically treating to obtain polyvinyl alcohol/nano microfibril/micro-nano bamboo powder coating, and coating the coating on the surface of base paper to obtain the hydrophobic oil-proof paper. But poor mechanical properties and barrier properties limit the use of the biodegradable hydrophobic oilproof paper.
CN 110195373A discloses a preparation method of food oil-proof paper, which comprises the steps of coating a sodium alginate solution on base paper, drying to obtain coated paper, then spraying a propylene glycol alginate solution on the coated paper, and drying to obtain the food oil-proof paper. The oil-proof paper prepared by the method is environment-friendly, and the hydrophobicity of the oil-proof paper is enhanced on the basis of ensuring the oil-proof performance of the paper. However, the sodium alginate solution coating has strong polarity and low density, and after being coated on base paper and dried, paper fibers become loose, and the mechanical property is poor.
According to the invention, the mechanical property of the base paper can be enhanced after the coating mixed with the nanofibrillar cellulose is coated and sized; the propylene glycol alginate solution and the nano-cellulose suspension prepared by the Tempo oxidation homogenization method are compounded, and then the surface of the compounded solution is coated on the dry paper after sizing, so that the grease resistance and the barrier property of the paper are improved. The preparation technology is green and environment-friendly, and the application of the extensible oil-proof paper in food packaging can be realized.
Disclosure of the invention
Aiming at the problems, the invention aims to provide a preparation method of green and efficient food oil-resistant wrapping paper, which can simultaneously improve the oil resistance, the mechanical property and the barrier property of the paper, expand the application range of the oil-resistant paper and prolong the storage and use period.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a preparation method of a food oil-proof paper-based material containing a nanofibril cellulose composite coating, which comprises the following steps:
(1) nanofibrillar cellulose suspension prepared by Tempo oxidative homogenization: diluting softwood pulp in a beaker by using deionized water to obtain slurry with the mass volume percentage concentration of 1-3% (w/v, the unit is g/mL), stirring for 0.5-1.5h at the rotating speed of 300-700r/min, sequentially adding TEMPO, NaBr and NaClO, continuously stirring for 1.5-2.5h, dropwise adding NaOH aqueous solution (preferably with the concentration of 0.8-1mol/L) to adjust the pH of the slurry to 10-10.5, when the pH value is maintained at 10-10.5, adding absolute ethyl alcohol to stop the reaction, performing suction filtration on the reacted slurry by using a vacuum filtration device, fully washing filter residues by using deionized water to obtain clean slurry, adding water to adjust the mass volume percentage concentration of the slurry to 1-3% (w/v), pouring the slurry into a high-pressure homogenizer to process for 4-6 times at the pressure of 80-100bar to obtain a nanofibrillar cellulose suspension with the mass volume percentage concentration of 1-3% (w/v); wherein the feeding mass ratio of the softwood pulp, TEMPO, NaBr and NaClO is 6-10 g: 0.10-0.14 g: 0.6-1.0 g: 6-10 g;
(2) adding propylene glycol alginate into water, and uniformly mixing to obtain a propylene glycol alginate solution with the mass volume percentage concentration of 1-2%;
(3) 1-3% of nanocellulose suspension by mass volume percentage and 1-2% of propylene glycol alginate solution by mass percentage according to the mass ratio of nanofibril cellulose to propylene glycol alginate of 1: 1-3, uniformly stirring, dispersing for 10-20min under ultrasonic waves, and removing bubbles to obtain a coating with good dispersibility;
(4) uniformly coating the coating liquid on the surface of the food packaging base paper, wherein the coating weight (based on the mass of the coating liquid coated on the food packaging base paper per unit area) is controlled to be 1-5g/m 2 ；
(5) And fully drying the coated paper at room temperature (preferably 23 +/-2 ℃) to obtain the food oil-proof paper base material containing the nano-fibril cellulose composite coating.
Preferably, in the step (1), the charging mass ratio of the softwood pulp, the TEMPO, the NaBr and the NaClO is 8 g: 0.12 g: 0.8 g: 8 g.
As a further preference, step (1) is carried out as follows: diluting softwood pulp in a beaker by using deionized water to obtain 1-3% (w/v) slurry, stirring for 1h at the rotating speed of 500r/min, sequentially adding TEMPO, NaBr and NaClO, continuously stirring for 2h, dropwise adding NaOH aqueous solution to adjust the pH of the slurry to 10-10.5, adding absolute ethyl alcohol to terminate the reaction when the pH is maintained at 10-10.5, performing suction filtration on the reacted slurry by using a vacuum suction filtration device, sufficiently washing filter residues by using deionized water to obtain clean slurry, adding water to adjust the mass volume percentage concentration of the slurry to 1-3% (w/v), pouring the slurry into a high-pressure homogenizer to treat for 5 times at the pressure of 90bar, and obtaining a nanofibril cellulose suspension with the mass volume percentage concentration of 1-3% (w/v); wherein the feeding mass ratio of the softwood pulp, TEMPO, NaBr and NaClO is 8 g: 0.12 g: 0.8 g: 8 g.
Preferably, in the step (3), the mass volume percentage of the nano cellulose suspension with the mass concentration of 1-3% and the mass percentage of the propylene glycol alginate solution with the mass concentration of 1-2% are in a ratio that the mass ratio of the nano fibril cellulose to the propylene glycol alginate is 1: 1 and mixing.
In step (4) of the present invention, there is no particular requirement for the coating method as long as "uniform coating" can be achieved, and the following operations can be generally performed: the food packaging base paper is arranged on a coating machine, fixed by a coating rod, a certain volume of coating liquid is taken from one end of the paper, and the coating machine is started to uniformly coat the coating liquid on the paper.
Preferably, the mass volume percentage concentration of the nano-cellulose suspension is 1%, the mass percentage concentration of the propylene glycol alginate solution is 1%, and the mass ratio of the nano-cellulose suspension to the propylene glycol alginate solution is 1: 1 preparing a coating by mixing, and controlling the coating amount in the step (4) to be 2g/m 2 。
By adopting the technology, compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, propylene glycol alginate and nanocellulose are used as oil-resistant functional components, and the oil-resistant coating with strong oil resistance and good air permeability is prepared by compounding the two components, so that the oil resistance of the coated paper can be greatly improved by using the coating, and the application value of the paper is improved.
In particular, nanocellulose can form hydrogen bonds between molecules or with water molecules, so that nanocellulose suspensions have excellent rheological properties of shear thinning. Therefore, the nanocellulose suspension can be coated on paper to prepare the food oil-proof paper with the effects of blocking grease and solvent penetration. However, nanocellulose has a large surface energy, which deteriorates the air permeability of paper, and a polar portion in the surface energy is low, which causes a decrease in oil resistance. The alginic acid propylene glycol ester is used as a low surface energy oleophobic substance and is oil repellent, the surface energy of the compound is reduced after the alginic acid propylene glycol ester is compounded with the nano-cellulose, the oil resistance and the air permeability of the paper are improved, and the oil resistance and the air permeability of the paper are improved
2. The mechanical strength and the barrier property of the paper base can be improved by coating the composite liquid with the mixed liquid of the propylene glycol alginate and the nano-cellulose, so that the application range of the oil-resistant paper is expanded, and the service life of the oil-resistant paper is prolonged.
In particular, the propylene glycol alginate has compact molecular chain arrangement, high crystallinity and good grease resistance, and is very suitable for being applied to food grease-resistant packaging. However, the propylene glycol alginate has a small molecular weight, so that when the propylene glycol alginate is directly used, the difference between the mechanical property and the traditional paper-plastic material is large, and the application range is greatly limited. After the sodium alginate and the nano-cellulose are compounded, intermolecular hydrogen bonds can be formed, so that molecular chains in a system are staggered and lengthened, and the mechanical property of the paper base material can be improved. In addition, the nanofibrillar cellulose in the biomass brings large specific surface area by virtue of small-size effect, has higher tensile strength and Young modulus than ordinary cellulose, and can be used for preparing a paper base material with good barrier property and high strength after being coated.
(IV) description of the drawings
FIG. 1 is a scanning electron micrograph of the surface and cross-section of the oil-repellent barrier paper prepared in examples 1 to 3.
FIG. 2 is a contact angle of diiodomethane and water on the surface of the oil-resistant barrier paper prepared in example and comparative example;
FIG. 3 is a transmission electron micrograph of nanofibrillar cellulose prepared according to example and comparative example 3.
(V) detailed description of the preferred embodiments
The following examples are set forth in order to provide a thorough understanding of the invention and to provide a further understanding of the invention. However, the present invention is not limited by the following examples.
Experimental materials: softwood pulp and food packaging base paper are provided by henda new materials, ltd; TEMPO, NaBr, NaClO, NaOH, absolute ethyl alcohol, propylene glycol alginate and other reagents are analytically pure and are provided by Shanghai Mielin Biotechnology Co., Ltd.
Example 1
(1) Nanofibrillar cellulose suspension prepared by Tempo oxidative homogenization: taking 8g of softwood pulp, diluting the softwood pulp into 1% (w/v) pulp by using deionized water in a 1500mL beaker, stirring for 1h at 500r/min, sequentially adding 0.12g of TEMPO, 0.8g of NaBr and 80mL of 10% NaClO solution, continuously stirring for 2h, dropwise adding 0.5mol/L of NaOH to adjust the pH of the pulp to 10-10.5, adding 5mL of absolute ethyl alcohol to stop the reaction when the pH is maintained at 10-10.5, carrying out suction filtration on the reacted pulp by using a vacuum filtration device, washing filter residue by using the deionized water, repeating for 3 times to obtain clean pulp, adding water to adjust the mass volume percentage concentration of the pulp to 1% (w/v), pouring the pulp into a high-pressure homogenizer, and processing for 5 times at 90bar pressure to obtain the nanofibrillar cellulose suspension with the mass volume percentage concentration of 1%.
(2) Adding 1.5g of propylene glycol alginate into 100mL of water, and uniformly mixing to obtain a propylene glycol alginate solution with the mass volume percentage concentration of 1.5%;
(3) mixing 1% of nano cellulose suspension and 1.5% of propylene glycol alginate solution in a volume ratio of 1: 1, mixing and stirring uniformly, dispersing for 15min under ultrasonic waves, and removing bubbles to obtain the coating with good dispersibility.
(4) Uniformly coating the coating liquid on the surface of food packaging base paper, wherein the coating weight is controlled to be 2g/m 2 ；
(5) And fully drying the coated paper at room temperature (23 +/-2 ℃) to obtain the oil-resistant packaging paper.
Example 2
(1) Nanofibrillar cellulose suspension prepared by Tempo oxidative homogenization: taking 8g of softwood pulp, diluting the softwood pulp to 2% (w/v) pulp by using deionized water in a 1500mL beaker, stirring for 1h at 500r/min, sequentially adding 0.14g of TEMPO, 1.0g of NaBr and 100mL of 10% NaClO solution, continuously stirring for 2h, dropwise adding 0.5mol/L of NaOH to adjust the pH value of the pulp to 10-10.5, adding 5mL of absolute ethyl alcohol to stop the reaction when the pH value is maintained at 10-10.5, carrying out suction filtration on the reacted pulp by using a vacuum suction filtration device, washing filter residue by using the deionized water, repeating for 3 times to obtain clean pulp, adding water to adjust the mass volume percentage concentration of the pulp to 2% (w/v), pouring the pulp into a high-pressure homogenizer, and processing for 5 times at 90bar pressure to obtain the nanofibrillar cellulose suspension with the mass volume percentage concentration of 2%.
(2) Adding 1g of propylene glycol alginate into 100g of water, and uniformly mixing to obtain a propylene glycol alginate solution with the mass volume percentage concentration of 1%;
(3) mixing a 2% nano cellulose suspension and a 1% propylene glycol alginate solution in a volume ratio of 1: 3, mixing, uniformly stirring, dispersing for 15min under ultrasonic waves, and removing bubbles to obtain the coating with good dispersibility.
(4) Uniformly coating the coating liquid on the surface of food packaging base paper, wherein the coating weight is controlled to be 2g/m 2 ；
(5) And fully drying the coated paper at room temperature (23 +/-2 ℃) to obtain the oil-resistant packaging paper.
Example 3
(1) Nanofibrillar cellulose suspension prepared by Tempo oxidative homogenization: taking 8g of softwood pulp, diluting the softwood pulp into 1% (w/v) pulp by using deionized water in a 1500mL beaker, stirring for 1h at 500r/min, sequentially adding 0.12g of TEMPO, 0.8g of NaBr and 80mL of 10% NaClO solution, continuously stirring for 2h, dropwise adding 0.5mol/L of NaOH to adjust the pH of the pulp to 10-10.5, adding 5mL of absolute ethyl alcohol to stop the reaction when the pH is maintained at 10-10.5, carrying out suction filtration on the reacted pulp by using a vacuum filtration device, washing filter residue by using the deionized water, repeating for 3 times to obtain clean pulp, adding water to adjust the mass volume percentage concentration of the pulp to 1% (w/v), pouring the pulp into a high-pressure homogenizer, and processing for 5 times at 90bar pressure to obtain the nanofibrillar cellulose suspension with the mass volume percentage concentration of 1%.
(2) Adding 1.5g of propylene glycol alginate into 100g of water, and uniformly mixing to obtain a propylene glycol alginate solution with the mass volume percentage concentration of 1.5%;
(3) mixing 1% of nano cellulose suspension and 1.5% of propylene glycol alginate solution in a volume ratio of 1: 1, mixing and stirring uniformly, dispersing for 15min under ultrasonic waves, and removing bubbles to obtain the coating with good dispersibility.
(4) Uniformly coating the coating liquid on the surface of food packaging base paper, wherein the coating amount is controlled to be 4g/m 2 ；
(5) And fully drying the coated paper at room temperature (23 +/-2 ℃) to obtain the oil-resistant packaging paper.
Comparative example 1:
(1) nanofibrillar cellulose suspension prepared by Tempo oxidative homogenization: taking 8g of softwood pulp, diluting the softwood pulp in a 1500mL beaker by using deionized water to obtain 1% (w/v) pulp, stirring for 1h at 500r/min, sequentially adding 0.12g of TEMPO, 0.8g of NaBr and 80mL of 10% NaClO solution, continuously stirring for 2h, dropwise adding 0.5mol/L of NaOH to adjust the pH of the pulp to 10-10.5, adding 5mL of absolute ethyl alcohol to stop the reaction when the pH is maintained at 10-10.5, carrying out suction filtration on the reacted pulp by using a vacuum filtration device, washing filter residue by using the deionized water, repeating for 3 times to obtain clean pulp, adding water to adjust the pulp to 1% (w/v), pouring the pulp into a high-pressure homogenizer, and treating for 5 times at 90bar pressure to obtain the nanofibrillar cellulose suspension with the mass volume percentage concentration of 1%.
(2) Mixing 1% of nano-cellulose suspension and deionized water in a volume ratio of 1: 1, mixing and stirring uniformly, dispersing for 15min under ultrasonic waves, and removing bubbles to obtain the coating with good dispersibility.
(3) Uniformly coating the coating liquid on the surface of food packaging base paper, wherein the coating weight is controlled to be 2g/m 2 ；
(4) And fully drying the coated paper at room temperature (23 +/-2 ℃) to obtain the oil-resistant packaging paper.
Comparative example 2:
(1) adding 1.5g of propylene glycol alginate into 100mL of water, and uniformly mixing to obtain a propylene glycol alginate solution with the mass volume percentage concentration of 1.5%;
(2) mixing 1.5% propylene glycol alginate solution with deionized water in a volume ratio of 1: 1, mixing and stirring uniformly, dispersing for 15min under ultrasonic waves, and removing bubbles to obtain the coating with good dispersibility.
(3) Uniformly coating the coating liquid on the surface of food packaging base paper, wherein the coating weight is controlled to be 2g/m 2 ；
(4) And fully drying the coated paper at room temperature (preferably 23 +/-2 ℃) to obtain the oil-resistant packaging paper.
Comparative example 3:
(1) nanofibrillar cellulose suspension prepared by Tempo oxidative homogenization: taking 5g of softwood pulp, diluting the softwood pulp into 1% (w/v) pulp by using deionized water in a 1500mL beaker, stirring for 1h at 500r/min, sequentially adding 0.16g of TEMPO, 1.2g of NaBr and 40mL of 10% NaClO solution, dropwise adding 0.5mol/L of Na OH to adjust the pH value of the pulp to 11-12, continuously stirring for 2h, adjusting the pH value of the pulp to 10, adding 5mL of absolute ethyl alcohol to stop the reaction when the pH value is maintained at 10, carrying out suction filtration on the reacted pulp by using a vacuum filtration device, washing filter residue by using the deionized water, repeating for 3 times to obtain clean pulp, adding water to adjust the mass volume percentage concentration of the pulp to 1% (w/v), pouring the pulp into a high-pressure homogenizer, and processing for 5 times at 90bar pressure to obtain the nanofibrillar cellulose suspension with the mass volume percentage concentration of 1%.
(2) Adding 1g of propylene glycol alginate into 100mL of water, and uniformly mixing to obtain a propylene glycol alginate solution with the mass volume percentage concentration of 1.5%;
(3) mixing 1% of nano cellulose suspension and 1.5% of propylene glycol alginate solution in a volume ratio of 1: 1, mixing and stirring uniformly, dispersing for 15min under ultrasonic waves, and removing bubbles to obtain the coating with good dispersibility.
(4) Uniformly coating the coating liquid on the surface of food packaging base paper, wherein the coating weight is controlled to be 2g/m 2 ；
(5) And fully drying the coated paper at room temperature (23 +/-2 ℃) to obtain the oil-resistant packaging paper.
The oil-resistant wrapping papers prepared in the examples and comparative examples were tested as follows:
1. and (3) testing mechanical properties:
the paper to be tested is sampled according to GB/T450-2008, and the sample is balanced for at least 24h under the conditions of 25 ℃ and 50% RH.
Ring crush strength: referring to GB/T2679.8-1995, the ring crush strength of paper sheets was measured by a ring crush strength compression apparatus and expressed as a ring crush strength index, and three groups were made for each sample and averaged.
The ring crush strength index Rd is 1000R/W, wherein Rd represents the ring crush index (N.m/g); r represents ring crush strength (kN/m); w represents the quantitative amount (g/m) of the sample 2 )
Burst strength: with reference to GB/T454-.
2. Smoothness testing:
with reference to GB/T456-2002, smoothness of paper is measured by a smoothness tester, and three sets of smoothness values are obtained for each sample, and the average value is represented by s.
3. And (3) testing air permeability:
according to the standard GB/T458-2008,using L&The Bendtsen air permeability of the paper is measured by a W air permeability tester, and the measurement area is 10cm 2 。
4. Oil resistance test:
the oil repellency rating of the coated paper was determined according to the specifications in the latest standard TAPPI 559cm-02, representing the oil repellency of the paper as an oil repellency rating.
5. Contact angle measurement:
the contact angle was measured using a contact angle surface analyzer, and other contact angle measurements were made by dropping 3 μ L of a water drop and diiodomethane. And (4) analyzing results:
the results of the scanning electron microscope tests on the oil-proof wrapping paper prepared in examples 1 to 3 are shown in fig. 1. The image shows that the coating is uniformly coated on the paper, the fiber of the coated paper is criss-cross, and the flocculent filler is more. The coating can fill a large number of gaps between the paper fibers, so that the oil is prevented from permeating the paper through the capillary action of the fiber gaps, and the reason why the oil-proof coating has the oil-proof effect is realized. The oilproof paper prepared in example 1 has almost all covered surfaces without gaps and dense cross sections, and such a microstructure enhances the oilproof performance. The profile of several large fibers can be seen on the surface of example 2, the fiber surface is almost completely covered, but the section has larger pores, because the prepared nanofibrillar cellulose has larger size, so that the compactness of the coating is poor. The surface of example 3 is obviously flocculent filler and has gaps, and the cross section has more holes. This is because excessive coating application can cause the coated paper fibers to break down during the drying stage and the coating can also agglomerate.
The oil contact angle and water contact angle of the oilproof papers of the prepared examples and comparative examples are shown in fig. 2. The maximum values of the oil contact angle and the water contact angle of example 1 indicate the best oil and water repellency, while the oil contact angle and the water contact angle of comparative example 2 are relatively small. This demonstrates that the small size of nanofibrillar cellulose and propylene glycol alginate improves the oil and water repellency properties of paper.
FIG. 3 shows TEM images of nanofibrillar cellulose prepared in examples 1 to 3 and comparative example 3. The nanofibrillar cellulose of examples 1 and 3 is similar in morphology and size, and the nanofibrillar cellulose of example 2 is slightly larger in size and has long rods that are cross. The nanofibrillar cellulose of comparative example 3 is significantly increased in size and is in a sheet form. This shows that when preparing nanofibrillar cellulose using the Tempo oxidative homogenization method, the ratio between Tempo, NaBr, NaClO and the reaction pH have a large influence on the size and morphology of nanofibrillar cellulose.
The mechanical properties, smoothness, air permeability and oil resistance rating of the prepared examples and comparative examples are shown in table 1. The ring crush strength index represents the compressive strength of the whole paper, and the burst strength represents the single-point compressive strength of the paper. The mechanical properties of the oilproof papers of the examples are higher than the comparative examples and much better than the paper based materials, with the best performance of example 1. The appropriate ratio of coating and smaller size of nanofibrillar cellulose increases the smoothness of the paper, showing that 1% nanocellulose suspension with 1.5% propylene glycol alginate solution in a 1: 1 hybrid coating application the oilproof paper of example 1 prepared had the highest smoothness and oil resistance rating. Air permeability is related to the surface and internal cellulose gaps of the paper, with the air permeability of example 1 being the best, consistent with the results observed in fig. 1.
TABLE 1
Claims (5)
1. A preparation method of food oil-proof paper base material containing a nanofibril cellulose composite coating comprises the following steps:
(1) diluting softwood pulp in a beaker by using deionized water to obtain slurry with the mass volume percentage concentration of 1-3%, stirring at the rotating speed of 300-700r/min for 0.5-1.5h, sequentially adding TEMPO, NaBr and NaClO, continuously stirring for 1.5-2.5h, dropwise adding NaOH aqueous solution to adjust the pH of the slurry to 10-10.5, adding absolute ethyl alcohol to stop the reaction when the pH is maintained at 10-10.5, performing suction filtration on the reacted slurry by using a vacuum filtration device, fully washing filter residues by using deionized water to obtain clean slurry, adding water to adjust the mass volume percentage concentration of the slurry to 1-3%, and then pouring the slurry into a high-pressure homogenizer to process for 4-6 times at the pressure of 80-100bar to obtain a nanofibrillar cellulose suspension with the mass volume percentage concentration of 1-3%; wherein the feeding mass ratio of the softwood pulp, TEMPO, NaBr and NaClO is 6-10 g: 0.10-0.14 g: 0.6-1.0 g: 6-10 g;
(2) adding propylene glycol alginate into water, and uniformly mixing to obtain a propylene glycol alginate solution with the mass volume percentage concentration of 1-2%;
(3) 1-3% of nanocellulose suspension by mass volume percentage and 1-2% of propylene glycol alginate solution by mass percentage according to the mass ratio of nanofibril cellulose to propylene glycol alginate of 1: 1-3, uniformly stirring, dispersing for 10-20min under ultrasonic waves, and removing bubbles to obtain a coating with good dispersibility;
(4) uniformly coating the coating liquid on the surface of food packaging base paper, wherein the coating amount is controlled to be 1-5g/m 2 ；
(5) And fully drying the coated paper at room temperature to obtain the food oil-proof paper base material containing the nano-fibril cellulose composite coating.
2. The method of claim 1, wherein: in the step (1), the feeding mass ratio of the softwood pulp, TEMPO, NaBr and NaClO is 8 g: 0.12 g: 0.8 g: 8 g.
3. The method of claim 1, wherein: the step (1) is implemented as follows: diluting softwood pulp in a beaker by using deionized water to obtain slurry with the mass volume percentage concentration of 1-3%, stirring for 1h at the rotating speed of 500r/min, sequentially adding TEMPO, NaBr and NaClO, continuing stirring for 2h, dropwise adding NaOH aqueous solution to adjust the pH of the slurry to 10-10.5, adding absolute ethyl alcohol to terminate the reaction when the pH is maintained at 10-10.5, performing suction filtration on the reacted slurry by using a vacuum suction filtration device, sufficiently washing filter residues by using deionized water to obtain clean slurry, adding water to adjust the mass volume percentage concentration of the slurry to 1-3%, pouring the slurry into a high-pressure homogenizer, and treating for 5 times at 90bar pressure to obtain a nanofibril cellulose suspension with the mass volume percentage concentration of 1-3%; wherein the mass ratio of the softwood pulp to the TEMPO to the NaBr to the NaClO is 8 g: 0.12 g: 0.8 g: 8 g.
4. The method of any one of claims 1 to 3, wherein: in the step (3), mixing 1-3% by mass volume of the nano cellulose suspension and 1-2% by mass of the propylene glycol alginate solution according to the mass ratio of the nano fibril cellulose to the propylene glycol alginate of 1: 1 and mixing.
5. The method of any one of claims 1 to 3, wherein: the mass volume percentage concentration of the nano cellulose suspension is 1%, the mass percentage concentration of the propylene glycol alginate solution is 1%, and the mass ratio of the nano cellulose suspension to the propylene glycol alginate solution is 1: 1 preparing a coating material by mixing, and controlling the coating amount in the step (4) to be 2g/m 2 。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116084209A (en) * | 2023-02-07 | 2023-05-09 | 江南大学 | Preparation method of fluorine-free degradable waterproof and oilproof packaging paper |
| CN116607352A (en) * | 2023-05-16 | 2023-08-18 | 浙江科技学院 | Method for preparing fluorine-free food oil-proof paper by adopting amidated modified nanocellulose |
| CN116607351A (en) * | 2023-05-22 | 2023-08-18 | 海南椰国食品有限公司 | Nanometer bacterial cellulose hydrophobic oil-proof paper and preparation method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1448427A (en) * | 2003-04-23 | 2003-10-15 | 中国科学院广州化学研究所 | Water dispersible nanometer avicel, its prep.and colloid therefrom |
| CN103889856A (en) * | 2011-08-19 | 2014-06-25 | 斯托拉恩索公司 | Process for providing a surface with a barrier and a substrate being produced according to the process |
| CN105568730A (en) * | 2015-12-21 | 2016-05-11 | 同济大学 | Method for preparing renewable nano-celluloses |
| CN107208378A (en) * | 2014-12-18 | 2017-09-26 | 斯道拉恩索公司 | The method of the substrate including cellulose fibre coated for producing |
| CN109152394A (en) * | 2016-02-24 | 2019-01-04 | 寰科创新有限公司 | Cellulosic material and its preparation and application |
| CN110195373A (en) * | 2019-05-31 | 2019-09-03 | 华南理工大学 | A kind of food greaseproof and preparation method thereof |
| CN110453526A (en) * | 2019-08-19 | 2019-11-15 | 东北林业大学 | A method of utilizing edible used additives building automatically cleaning and super hydrophobic functional paper |
| CN113914140A (en) * | 2021-10-29 | 2022-01-11 | 北京林业大学 | Biodegradable high-barrier coated paper and preparation method and application thereof |
-
2022
- 2022-03-31 CN CN202210337733.9A patent/CN114808543B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1448427A (en) * | 2003-04-23 | 2003-10-15 | 中国科学院广州化学研究所 | Water dispersible nanometer avicel, its prep.and colloid therefrom |
| CN103889856A (en) * | 2011-08-19 | 2014-06-25 | 斯托拉恩索公司 | Process for providing a surface with a barrier and a substrate being produced according to the process |
| CN107208378A (en) * | 2014-12-18 | 2017-09-26 | 斯道拉恩索公司 | The method of the substrate including cellulose fibre coated for producing |
| CN105568730A (en) * | 2015-12-21 | 2016-05-11 | 同济大学 | Method for preparing renewable nano-celluloses |
| CN109152394A (en) * | 2016-02-24 | 2019-01-04 | 寰科创新有限公司 | Cellulosic material and its preparation and application |
| CN110195373A (en) * | 2019-05-31 | 2019-09-03 | 华南理工大学 | A kind of food greaseproof and preparation method thereof |
| CN110453526A (en) * | 2019-08-19 | 2019-11-15 | 东北林业大学 | A method of utilizing edible used additives building automatically cleaning and super hydrophobic functional paper |
| CN113914140A (en) * | 2021-10-29 | 2022-01-11 | 北京林业大学 | Biodegradable high-barrier coated paper and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 盛俊娇: "海藻酸钠及聚乳酸涂覆纸张防油性能的研究", 《 中国优秀硕士论文电子期刊网》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116084209A (en) * | 2023-02-07 | 2023-05-09 | 江南大学 | Preparation method of fluorine-free degradable waterproof and oilproof packaging paper |
| CN116084209B (en) * | 2023-02-07 | 2024-02-27 | 江南大学 | Preparation method of fluorine-free degradable waterproof and oilproof packaging paper |
| CN116607352A (en) * | 2023-05-16 | 2023-08-18 | 浙江科技学院 | Method for preparing fluorine-free food oil-proof paper by adopting amidated modified nanocellulose |
| CN116607351A (en) * | 2023-05-22 | 2023-08-18 | 海南椰国食品有限公司 | Nanometer bacterial cellulose hydrophobic oil-proof paper and preparation method thereof |
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|---|---|
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