CN114619730B - Packaging film and preparation method thereof - Google Patents
Packaging film and preparation method thereof Download PDFInfo
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- CN114619730B CN114619730B CN202210142563.9A CN202210142563A CN114619730B CN 114619730 B CN114619730 B CN 114619730B CN 202210142563 A CN202210142563 A CN 202210142563A CN 114619730 B CN114619730 B CN 114619730B
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- 239000012785 packaging film Substances 0.000 title claims abstract description 35
- 229920006280 packaging film Polymers 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 229920002678 cellulose Polymers 0.000 claims abstract description 132
- 239000001913 cellulose Substances 0.000 claims abstract description 132
- 239000002159 nanocrystal Substances 0.000 claims abstract description 30
- 239000002131 composite material Substances 0.000 claims abstract description 27
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 14
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 14
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims abstract description 12
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims abstract description 12
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims description 16
- 238000007731 hot pressing Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000010030 laminating Methods 0.000 claims description 9
- 239000012528 membrane Substances 0.000 claims description 7
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- DQYBDCGIPTYXML-UHFFFAOYSA-N ethoxyethane;hydrate Chemical compound O.CCOCC DQYBDCGIPTYXML-UHFFFAOYSA-N 0.000 claims description 2
- 239000002121 nanofiber Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 3
- 238000003475 lamination Methods 0.000 claims 2
- 239000002994 raw material Substances 0.000 abstract description 4
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- 229920001131 Pulp (paper) Polymers 0.000 description 4
- 238000005903 acid hydrolysis reaction Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000005022 packaging material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000502 dialysis Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000000053 physical method Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- JHJLBTNAGRQEKS-UHFFFAOYSA-M sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 2
- 229920002749 Bacterial cellulose Polymers 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 239000005016 bacterial cellulose Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/04—Cellulosic plastic fibres, e.g. rayon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/716—Degradable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
Abstract
The invention discloses a packaging film and a preparation method thereof. The packaging film comprises a first cellulose nano-filament film, a cellulose nano-filament-cellulose nanocrystalline composite film and a second cellulose nano-filament film which are sequentially laminated and attached, wherein the cellulose nano-filament film is formed by interweaving cellulose nano-filaments, and the cellulose nano-filament-cellulose nanocrystalline composite film comprises polyvinyl alcohol, hydroxypropyl cellulose, cellulose nano-filaments and cellulose nanocrystals. The packaging film disclosed by the invention has the advantages of high strength, greenness, degradability and the like, and the raw materials for preparation are wide in source, green and environment-friendly, and suitable for large-scale production and application.
Description
Technical Field
The invention relates to the technical field of packaging materials, in particular to a packaging film and a preparation method thereof.
Background
In recent years, plastic packages and plastic package products have been increasingly sold in the market, and are widely used in the fields of food, medicine, chemical industry and the like. With the improvement of living standard, people have correspondingly higher requirements on the packaging of products. Although the plastic packaging material has the advantages of light weight, high strength, low price and the like, most of the existing plastic packaging materials are difficult to degrade, bring convenience to life of people, generate a large amount of waste, cause underground water and soil pollution and have great harm to the ecological environment and human health.
The nano-cellulose is obtained by using common cellulose as a raw material and treating the raw material by a chemical method, a physical method, a biological method or a combination of the chemical method, the physical method and the biological method, has the advantages of wide source, low cost, good biocompatibility, reproducibility, degradability and the like, and has good application prospect in the field of plastic packaging. However, the film material prepared from the nano-cellulose has generally poor mechanical strength, and is easy to tear, stretch and puncture, so that the further use of the film material in composite packaging films is limited.
Therefore, the development of a green degradable packaging film with high strength is of great significance.
Disclosure of Invention
The invention aims to provide a packaging film and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
a packaging film comprises a first cellulose nano-fibril film, a cellulose nano-fibril-cellulose nanocrystalline composite film and a second cellulose nano-fibril film which are laminated and attached in sequence; the cellulose nano-fibril film is formed by interweaving cellulose nano-fibrils; the cellulose nano-fibril-cellulose nano-crystal composite membrane comprises polyvinyl alcohol, hydroxypropyl cellulose, cellulose nano-fibrils and cellulose nano-crystals.
Preferably, the aspect ratio of the cellulose nanofibrils is 200.
Preferably, the cellulose nanofibrils are selected from at least one of wood pulp based cellulose nanofibrils and bacterial cellulose nanofibrils.
Preferably, the cellulose nanocrystals are rod-shaped and have a length of less than 200nm.
Preferably, the cellulose nanocrystals are wood pulp-based cellulose nanocrystals.
Preferably, the thickness of the cellulose nanofiber membrane is 15 to 25 μm.
Preferably, the mass ratio of polyvinyl alcohol, hydroxypropyl cellulose, cellulose nanofibrils and cellulose nanocrystals in the cellulose nanofibril-cellulose nanocrystal composite membrane is (8) 1.8-2.2.
Preferably, the polyvinyl alcohol has a number average molecular weight of 16000g/mol to 20000g/mol.
Preferably, the thickness of the cellulose nanofibril-cellulose nanocrystal composite membrane is 35 to 45 micrometers.
The preparation method of the packaging film comprises the following steps:
1) Dispersing cellulose nano fibrils in a solvent to prepare a film forming solution I, and dispersing polyvinyl alcohol, hydroxypropyl cellulose, cellulose nano fibrils and cellulose nanocrystals in the solvent to prepare a film forming solution II;
2) Filtering the film forming solution I to prepare a cellulose nano-fibril film, and filtering the film forming solution II to prepare a cellulose nano-fibril-cellulose nanocrystalline composite film;
3) And sequentially laminating the cellulose nano-fibril film, the cellulose nano-fibril-cellulose nanocrystalline composite film and the cellulose nano-fibril film, and performing hot-pressing and laminating to obtain the packaging film.
Preferably, the solvent in step 1) is at least one selected from water, ethanol and diethyl ether.
Preferably, the hot-pressing bonding in the step 3) is carried out at the temperature of 70-90 ℃ and the pressure of 0.8-1.2 MPa, and the hot-pressing time is 5-15 min.
The beneficial effects of the invention are: the packaging film disclosed by the invention has the advantages of high strength, environmental friendliness, degradability and the like, and the preparation raw materials are wide in source, environment-friendly and suitable for large-scale production and application.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
a packaging film, the preparation method of which comprises the following steps:
1) Adding water into 10g of wood pulp-based cellulose powder to disperse to prepare cellulose powder suspension, respectively adding water into 0.16g of 2, 6-tetramethylpiperidine oxide (heated and dissolved at 50 ℃) and 1g of sodium bromide to dissolve, then pouring the solution into the cellulose powder suspension in sequence, gradually adding 100mL of 13% by mass sodium hypochlorite solution into the cellulose powder suspension under continuous stirring, controlling the pH of the cellulose powder suspension to be within a range of 10-10.5 through 0.5mol/L sodium hydroxide solution in the whole process, adding 1mL of ethanol to terminate the reaction when the pH of the solution is not changed any more, then carrying out suction filtration and washing on the suspension for at least 3 times, then adding filtrate into a high-pressure homogenizer, and carrying out circulating homogenization for 8 times under the condition that the pressure is 180MPa to obtain 1% by mass cellulose nano-fibril (the length-diameter ratio is 200-500;
2) Adding 10g of wood pulp-based cellulose powder into 200mL of 65% sulfuric acid solution, reacting for 2h at 50 ℃, adding water to terminate the reaction, performing repeated refrigerated centrifugation, setting the rotation speed of a centrifuge to 10000rpm, setting the time of each centrifugation to 10min, putting the centrifuged supernatant into a dialysis bag (with the molecular weight cutoff of 14000 g/mol) to perform dialysis in water until the pH of the dialysate is neutral, and obtaining 1% cellulose nanocrystal (rod-shaped, length less than 200 nm) dispersion liquid;
3) Mixing polyvinyl alcohol (with the number average molecular weight of 18000 g/mol), hydroxypropyl cellulose and water according to a mass ratio of 4;
4) Filtering the film forming solution I under the pressure of 0.5MPa to prepare a cellulose nano-fibril film (the thickness of the control film is 20 mu m +/-5 mu m), and filtering the film forming solution II under the pressure of 2MPa to prepare a cellulose nano-fibril-cellulose nano-crystal composite film (the thickness of the control film is 40 mu m +/-5 mu m);
5) Sequentially laminating the cellulose nano-fibril film, the cellulose nano-fibril-cellulose nanocrystalline composite film and the cellulose nano-fibril film, and hot-pressing and attaching for 10min at the temperature of 80 ℃ and the pressure of 1MPa to obtain the packaging film.
Example 2:
a packaging film, the preparation method of which comprises the following steps:
1) Preparing a dispersion (i.e., a film-forming solution I) of cellulose nanofibrils (aspect ratio 200: 1-500;
2) Preparing a dispersion of 1% by mass of cellulose nanocrystals (length less than 200 nm) by acidolysis (same as example 1);
3) Mixing polyvinyl alcohol (with the number average molecular weight of 16000 g/mol), hydroxypropyl cellulose and water according to the mass ratio of 4;
4) Filtering the film-forming solution I under the pressure of 0.5MPa to prepare a cellulose nano-fibril film (the thickness of the control film is 20 mu m +/-5 mu m), and filtering the film-forming solution II under the pressure of 2MPa to prepare a cellulose nano-fibril-cellulose nano-crystal composite film (the thickness of the control film is 40 mu m +/-5 mu m);
5) Sequentially laminating the cellulose nano-fibril film, the cellulose nano-fibril-cellulose nanocrystalline composite film and the cellulose nano-fibril film, and hot-pressing and attaching for 10min at the temperature of 80 ℃ and the pressure of 1MPa to obtain the packaging film.
Example 3:
a packaging film, the preparation method of which comprises the following steps:
1) Preparing a dispersion (i.e., a film-forming solution I) of cellulose nanofibrils (aspect ratio 200: 1-500;
2) Preparing a dispersion of 1% by mass of cellulose nanocrystals (length less than 200 nm) by an acid hydrolysis method (same as example 1);
3) Mixing polyvinyl alcohol (with the number average molecular weight of 18000 g/mol), hydroxypropyl cellulose and water according to a mass ratio of 4;
4) Filtering the film-forming solution I under the pressure of 0.5MPa to prepare a cellulose nano-fibril film (the thickness of the control film is 20 mu m +/-5 mu m), and filtering the film-forming solution II under the pressure of 2MPa to prepare a cellulose nano-fibril-cellulose nano-crystal composite film (the thickness of the control film is 40 mu m +/-5 mu m);
5) Sequentially laminating the cellulose nano-fibril film, the cellulose nano-fibril-cellulose nanocrystalline composite film and the cellulose nano-fibril film, and hot-pressing and attaching for 10min at the temperature of 80 ℃ and the pressure of 1MPa to obtain the packaging film.
Example 4:
a packaging film, the preparation method of which comprises the following steps:
1) Preparing a dispersion (i.e., a film-forming solution I) of cellulose nanofibrils (aspect ratio 200: 1-500;
2) Preparing a dispersion of 1% by mass of cellulose nanocrystals (length less than 200 nm) by an acid hydrolysis method (same as example 1);
3) Mixing polyvinyl alcohol (with the number average molecular weight of 18000 g/mol), hydroxypropyl cellulose and water according to a mass ratio of 4;
4) Filtering the film-forming solution I under the pressure of 0.5MPa to prepare a cellulose nano-fibril film (the thickness of the control film is 20 mu m +/-5 mu m), and filtering the film-forming solution II under the pressure of 2MPa to prepare a cellulose nano-fibril-cellulose nano-crystal composite film (the thickness of the control film is 40 mu m +/-5 mu m);
5) Sequentially laminating the cellulose nano-fibril film, the cellulose nano-fibril-cellulose nanocrystalline composite film and the cellulose nano-fibril film, and hot-pressing and attaching for 10min at the temperature of 80 ℃ and the pressure of 1MPa to obtain the packaging film.
Example 5:
a packaging film, the preparation method of which comprises the following steps:
1) Preparing a dispersion (i.e., a film-forming solution I) of cellulose nanofibrils (aspect ratio 200: 1-500;
2) Preparing a dispersion of 1% by mass of cellulose nanocrystals (length less than 200 nm) by an acid hydrolysis method (same as example 1);
3) Mixing polyvinyl alcohol (with the number average molecular weight of 18000 g/mol), hydroxypropyl cellulose and water according to a mass ratio of 4;
4) Filtering the film-forming solution I under the pressure of 0.5MPa to prepare a cellulose nano-fibril film (the thickness of the control film is 20 mu m +/-5 mu m), and filtering the film-forming solution II under the pressure of 2MPa to prepare a cellulose nano-fibril-cellulose nano-crystal composite film (the thickness of the control film is 40 mu m +/-5 mu m);
5) Sequentially laminating the cellulose nano-fibril film, the cellulose nano-fibril-cellulose nanocrystalline composite film and the cellulose nano-fibril film, and hot-pressing and attaching for 10min at the temperature of 80 ℃ and the pressure of 1MPa to obtain the packaging film.
Comparative example:
a packaging film, the preparation method of which comprises the following steps:
1) Preparing a dispersion (i.e., a film-forming solution I) of cellulose nanofibrils (aspect ratio 200: 1-500;
2) Preparing a dispersion of 1% by mass of cellulose nanocrystals (length less than 200 nm) by an acid hydrolysis method (same as example 1);
3) Mixing the cellulose nano fibril dispersion liquid obtained in the step 1) and the cellulose nano crystal dispersion liquid obtained in the step 2) according to a mass ratio of 1;
4) Filtering the film-forming solution I under the pressure of 0.5MPa to prepare a cellulose nano-fibril film (the thickness of the control film is 20 mu m +/-5 mu m), and filtering the film-forming solution II under the pressure of 2MPa to prepare a cellulose nano-fibril-cellulose nano-crystal composite film (the thickness of the control film is 40 mu m +/-5 mu m);
5) Sequentially laminating the cellulose nano-fibril film, the cellulose nano-fibril-cellulose nanocrystalline composite film and the cellulose nano-fibril film, and hot-pressing and bonding for 10min at the temperature of 80 ℃ and the pressure of 1MPa to obtain the packaging film.
And (4) performance testing:
the packaging films of examples 1 to 5 and comparative example were subjected to a performance test, and the test results are shown in the following table:
table 1 results of performance test of the packaging films of examples 1 to 5 and comparative example
| Test items | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Comparative example |
| Film thickness (μm) | 52.3 | 54.6 | 53.1 | 51.4 | 53.9 | 61.8 |
| Tensile Strength (MPa) | 172 | 163 | 176 | 179 | 168 | 144 |
Note:
tensile strength: the packaging film samples were cut into rectangular strips of size 8mm × 60mm, placed in a constant temperature and humidity environment (temperature 23 ℃, relative humidity 50%) for 48h, the thickness of each rectangular strip was measured by a thickness gauge (L & W251, sweden), and the tensile strength of the rectangular strips was measured by a tensile compression tester (INSTRON 5565, usa) at a test speed of 20mm/min with an initial gap of 20mm, 3 repeated measurements were made for each packaging film sample and the average value was recorded.
As can be seen from Table 1: the wrap films of examples 1 to 5 all had higher tensile strength at a lower thickness than the wrap film of the comparative example.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.
Claims (4)
1. A packaging film characterized by: the packaging film comprises a first cellulose nano-fibril film, a cellulose nano-fibril-cellulose nanocrystalline composite film and a second cellulose nano-fibril film which are sequentially laminated and attached; the cellulose nano-fibril membrane is formed by interweaving cellulose nano-fibrils; the cellulose nano fibril-cellulose nano crystal composite membrane comprises polyvinyl alcohol, hydroxypropyl cellulose, cellulose nano fibrils and cellulose nano crystals; the aspect ratio of the cellulose nanofibrils is 200; the cellulose nanocrystal is rod-shaped, and the length of the cellulose nanocrystal is less than 200nm; the thickness of the cellulose nano-fiber membrane is 15-25 mu m; the mass ratio of polyvinyl alcohol, hydroxypropyl cellulose, cellulose nanofibrils and cellulose nanocrystals in the cellulose nanofibril-cellulose nanocrystal composite film is 8; the number average molecular weight of the polyvinyl alcohol is 16000 g/mol-20000 g/mol; the thickness of the cellulose nano fibril-cellulose nanocrystalline composite film is 35-45 μm.
2. The method for producing a packaging film according to claim 1, comprising the steps of:
1) Dispersing cellulose nano fibrils in a solvent to prepare a film forming solution I, and dispersing polyvinyl alcohol, hydroxypropyl cellulose, cellulose nano fibrils and cellulose nanocrystals in the solvent to prepare a film forming solution II;
2) Filtering the film forming solution I to prepare a cellulose nano-fibril film, and filtering the film forming solution II to prepare a cellulose nano-fibril-cellulose nanocrystalline composite film;
3) And sequentially laminating the cellulose nano-fibril film, the cellulose nano-fibril-cellulose nanocrystalline composite film and the cellulose nano-fibril film, and performing hot-pressing lamination to obtain the packaging film.
3. The method for producing a packaging film according to claim 2, characterized in that: the solvent in the step 1) is at least one selected from water, ethanol and diethyl ether.
4. The method for producing a packaging film according to claim 2 or 3, characterized in that: and 3) performing hot-pressing lamination under the conditions that the temperature is 70-90 ℃ and the pressure is 0.8-1.2 MPa, wherein the hot-pressing time is 5-15 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210142563.9A CN114619730B (en) | 2022-02-16 | 2022-02-16 | Packaging film and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210142563.9A CN114619730B (en) | 2022-02-16 | 2022-02-16 | Packaging film and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114619730A CN114619730A (en) | 2022-06-14 |
| CN114619730B true CN114619730B (en) | 2022-12-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014218579A (en) * | 2013-05-08 | 2014-11-20 | 凸版印刷株式会社 | Coating liquid for forming gas barrier layer and manufacturing method thereof, gas barrier laminate and packaging material |
| WO2017089508A1 (en) * | 2015-11-27 | 2017-06-01 | Tetra Laval Holdings & Finance S.A. | Laminated packaging material, packaging containers manufactured therefrom |
| CN209258748U (en) * | 2018-05-31 | 2019-08-16 | 美罗迪亚有限公司 | Multi-layer articles |
| CN111300918A (en) * | 2020-03-16 | 2020-06-19 | 齐鲁工业大学 | Optical nano cellulose membrane and preparation method and application thereof |
| CN112236299A (en) * | 2018-05-31 | 2021-01-15 | 美罗迪亚有限公司 | Multilayer article |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2014218579A (en) * | 2013-05-08 | 2014-11-20 | 凸版印刷株式会社 | Coating liquid for forming gas barrier layer and manufacturing method thereof, gas barrier laminate and packaging material |
| WO2017089508A1 (en) * | 2015-11-27 | 2017-06-01 | Tetra Laval Holdings & Finance S.A. | Laminated packaging material, packaging containers manufactured therefrom |
| CN209258748U (en) * | 2018-05-31 | 2019-08-16 | 美罗迪亚有限公司 | Multi-layer articles |
| CN112236299A (en) * | 2018-05-31 | 2021-01-15 | 美罗迪亚有限公司 | Multilayer article |
| CN111300918A (en) * | 2020-03-16 | 2020-06-19 | 齐鲁工业大学 | Optical nano cellulose membrane and preparation method and application thereof |
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