CN108587018A - A kind of special polyvinyl alcohol preservative film of strawberry packaging - Google Patents
A kind of special polyvinyl alcohol preservative film of strawberry packaging Download PDFInfo
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- CN108587018A CN108587018A CN201810520638.6A CN201810520638A CN108587018A CN 108587018 A CN108587018 A CN 108587018A CN 201810520638 A CN201810520638 A CN 201810520638A CN 108587018 A CN108587018 A CN 108587018A
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J2329/00—Characterised by the use 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; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C08J2469/00—Characterised by the use of polycarbonates; Derivatives of polycarbonates
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2489/00—Characterised by the use of proteins; Derivatives thereof
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C08K2201/011—Nanostructured additives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K3/346—Clay
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K3/36—Silica
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/101—Esters; Ether-esters of monocarboxylic acids
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
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Abstract
The invention discloses a kind of strawberries to pack special polyvinyl alcohol preservative film, and raw material includes by weight：100 parts of polyvinyl alcohol, 25 40 parts of soybean protein, 8 23 parts of poly (propylene carbonate), 12 parts of fluororesin powder, 28 parts of medical stone, 29 parts of zeolite, 25 parts of nano-titanium dioxide, 0.5 1.8 parts of nano silicon dioxide, 12 parts of nano-calcium carbonate, 14 parts of bentonite, modified 39 parts of methyl jasmonate, 26 parts of plant antimicrobial, 15 parts of beta cyclodextrin, 0.5 1.5 parts of sorbic acid, 13 parts of glycerine, 0.3 1.2 parts of sodium alginate, 0.4 1.3 parts of polyvinylpyrrolidone.Strawberry proposed by the present invention packs special polyvinyl alcohol preservative film, and anti-microbial property is excellent, high mechanical strength, and the packaging for strawberry can inhibit a variety of harmful microbes to grow and breed, and the quality for strawberry of having guaranteed the quality extends the shelf life of strawberry.
Description
Technical field
The present invention relates to postharvest technology of fruits and vegetables fields more particularly to a kind of strawberry to pack special polyvinyl alcohol preservative film.
Background technology
Strawberry is delicious red tender, pulp succulence, and containing special strong fruit aroma, nutritive value is high, containing abundant vitamin
The effect of C, helpful digestion, at the same time, strawberry, can also consolidate gums, and fresh breath, moisten throat.But because of its water content
Height, tissue is delicate, breathing is vigorous, moisture loss is fast, under normal circumstances, places after strawberry harvesting 1-2 days and tarnishes, fruit face
It shrinks, quality declines, and to lose commodity value, therefore, the fresh-keeping packaging of strawberry is most important.Preservative film packaging due at
This is low, popularization is wide, and market acceptance is higher, is to apply wide strawberry preservation method in recent years.
The simple production process of polyvinyl alcohol film, and barrier property, physical mechanical property and biodegradability are good
It is good, noxious material will not be released during normal use, safety and environmental protection, while penetrability is good, when vegetables and fruits are packed in film
Droplet will not be condensed, has been widely used at present.But traditional its antibiotic property of polyvinyl alcohol preservative film is not fine, is being carried out
There are the defects of antibacterial and mouldproof poor performance during vegetable and fruit packaging, while mechanical performance is less desirable.
Invention content
Technical problems based on background technology, it is fresh-keeping that the present invention proposes a kind of special polyvinyl alcohol of strawberry packaging
Film, anti-microbial property is excellent, high mechanical strength, and the packaging for strawberry can inhibit a variety of harmful microbes to grow and breed,
It has guaranteed the quality the quality of strawberry, has extended the shelf life of strawberry.
A kind of strawberry proposed by the present invention packs special polyvinyl alcohol preservative film, and raw material includes by weight：Polyethylene
100 parts of alcohol, 25-40 parts of soybean protein, 8-23 parts of poly (propylene carbonate), 1-2 parts of fluororesin powder, 2-8 parts of medical stone, zeolite 2-
9 parts, it is 2-5 parts of nano-titanium dioxide, 0.5-1.8 parts of nano silicon dioxide, 1-2 parts of nano-calcium carbonate, 1-4 parts of bentonite, modified
3-9 parts of methyl jasmonate, 2-6 parts of plant antimicrobial, 1-5 parts of beta-cyclodextrin, 0.5-1.5 parts of sorbic acid, 1-3 parts of glycerine, seaweed
Sour sodium 0.3-1.2 parts, 0.4-1.3 parts of polyvinylpyrrolidone.
Preferably, the average grain diameter of the medical stone is 10-20 μm；The average grain diameter of the zeolite is 10-15 μm；It is described
The average grain diameter of nano-titanium dioxide is 25-35nm；The average grain diameter of the nano silicon dioxide is 40-65nm；The nanometer
The average grain diameter of calcium carbonate is 50-80nm.
Preferably, the modified methyl jasmonate is prepared according to following technique：Aqueous acetic acid is added in chitosan
In, it is uniformly mixing to obtain material A；Methyl jasmonate is added in absolute ethyl alcohol, is stirring evenly and then adding into material A, stirring is equal
It is even to obtain material B；Material B is added in the mixture of atoleine and Tween-80, stirs to get emulsion, is then added fragrant
Oxalaldehyde aqueous solution, is stirred at room temperature 5-9h, centrifuges, washs, being dried to obtain the modified methyl jasmonate.
Preferably, in the preparation process of modified methyl jasmonate, chitosan used, methyl jasmonate, vanillic aldehyde weight
Amount is than being 3-8：1-18：0.4-1.
Preferably, the plant antimicrobial is the mixture of pomelo peel, luffa, purple stem boneset extract, plants essential oil.
Preferably, in the plant antimicrobial, pomelo peel, luffa, purple stem boneset extract, plants essential oil weight ratio
For 2-5：3-9：1-2：0.5-1.
Preferably, the plants essential oil is clove oil.
Purple stem boneset extract of the present invention is prepared according to following technique：By Eupatorium adenophorum crushed after being dried, mistake
Then sieve is added in absolute ethyl alcohol, 20-30h is extracted at 30-45 DEG C, filter, be concentrated to give the purple stem boneset extract.
Strawberry of the present invention packs special polyvinyl alcohol preservative film, in raw material, using polyvinyl alcohol as major ingredient, simultaneously plus
Entered soybean protein, poly (propylene carbonate), fluororesin powder and its coordinate, and specifically control four ratio be 100：25-
40：8-23：1-2 plays best performance synergistic effect, it is excellent to assign preservative film to make four to have excellent compatibility
Mechanical performance and moisture-inhibiting oxygen permeability；In nano-titanium dioxide addition system, the nothing in soybean protein can be evenly placed
In regular domain, meanwhile, nano-titanium dioxide surface easily forms Ti positive ions, the nitrogen-atoms with protein peptide chain in soybean protein
Certain coordination effect occurs, induction of the variation of peptide chain structure in amorphous domain in preservative film, promotes peptide chain by crimping
Structure becomes foldable structure so that more peptide chains are locally arranged in an orderly manner, the crystallinity of molecule are increased, with wheat meal
Stone, zeolite, nano silicon dioxide, nano-calcium carbonate, bentonite cooperation, increase the tensile strength and elongation at break of preservative film
Etc. mechanical performances, make gained preservative film tensile strength reach 6.35MPa or more, elongation at break increases to 94.83% or more,
Meanwhile making the hydroxyl in system that can not improve the resistance to of preservative film with the hydroxy combining in soybean protein, polyvinyl alcohol at hydrogen bond
It is aqueous, that is, its water absorption rate is reduced, its water absorption rate is made to be reduced to 28.3% hereinafter, improving caused by the addition of soybean protein
The high defect of bad mechanical strength, water absorption rate assigns preservative film excellent stability；In the preparation process of modified methyl jasmonate
In, using chitosan, methyl jasmonate and vanillic aldehyde as raw material, by controlling the condition of reaction, make the part of hydroxyl in chitosan
Hydrogen bond is formed with vanillic aldehyde, part of hydroxyl forms contracting urea structure with vanillic aldehyde, is obtained to which protoconch glycan has been carried out crosslinking
Chitosan microball, while methyl jasmonate being successfully wrapped in the crosslinked chitosan microball of vanillic aldehyde, obtain chitosan
The methyl jasmonate of package, i.e., modified methyl jasmonate, is added into system, has long-acting antibacterial action, be added simultaneously
The plant antimicrobial of pomelo peel, luffa, purple stem boneset extract, plants essential oil composition, hydroxyl present in plant antimicrobial
Base can form intermolecular hydrogen bonding effect with the hydroxyl in polyvinyl alcohol, improve compatibility of the plant antimicrobial in system,
With modified methyl jasmonate cooperation preservative film is assigned on the basis of ensureing fresh-keeping film dynamic performance, hot property, permeability
Long-acting excellent antibiotic property, the packaging for strawberry can inhibit a variety of harmful microbes to grow, and maintain nutrition inside strawberry
The content of substance extends the shelf life of strawberry 2-4 days.
Specific implementation mode
In the following, technical scheme of the present invention is described in detail by specific embodiment.
Embodiment 1
A kind of strawberry proposed by the present invention packs special polyvinyl alcohol preservative film, and raw material includes by weight：Polyethylene
100 parts of alcohol, 40 parts of soybean protein, 8 parts of poly (propylene carbonate), 2 parts of fluororesin powder, 2 parts of medical stone, 9 parts of zeolite, nano-silica
Change 2 parts of titanium, 1.8 parts of nano silicon dioxide, 1 part of nano-calcium carbonate, 4 parts of bentonite, modified 3 parts of methyl jasmonate, plants antimicrobial
6 parts of agent, 1 part of beta-cyclodextrin, 1.5 parts of sorbic acid, 1 part of glycerine, 1.2 parts of sodium alginate, 0.4 part of polyvinylpyrrolidone.
Embodiment 2
A kind of strawberry proposed by the present invention packs special polyvinyl alcohol preservative film, and raw material includes by weight：Polyethylene
100 parts of alcohol, 25 parts of soybean protein, 23 parts of poly (propylene carbonate), 1 part of fluororesin powder, 8 parts of medical stone, 2 part, nanometer two of zeolite
5 parts of titanium oxide, 0.5 part of nano silicon dioxide, 2 parts of nano-calcium carbonate, 1 part of bentonite, modified 9 parts of methyl jasmonate, Genes For Plant Tolerance
2 parts of microbial inoculum, 5 parts of beta-cyclodextrin, 0.5 part of sorbic acid, 3 parts of glycerine, 0.3 part of sodium alginate, 1.3 parts of polyvinylpyrrolidone.
Embodiment 3
A kind of strawberry proposed by the present invention packs special polyvinyl alcohol preservative film, and raw material includes by weight：Polyethylene
100 parts of alcohol, 38 parts of soybean protein, 9 parts of poly (propylene carbonate), 1.8 parts of fluororesin powder, 3 parts of medical stone, 8 part, nanometer two of zeolite
3 parts of titanium oxide, 1.3 parts of nano-calcium carbonate, 3.2 parts of bentonite, modified 4 parts of methyl jasmonate, is planted at 1.5 parts of nano silicon dioxide
5.2 parts of object antiseptic, 1.8 parts of beta-cyclodextrin, 1.3 parts of sorbic acid, 1.5 parts of glycerine, 1 part of sodium alginate, polyvinylpyrrolidone
0.7 part；
Wherein, the average grain diameter of the medical stone is 10 μm；The average grain diameter of the zeolite is 15 μm；The nano-silica
The average grain diameter for changing titanium is 25nm；The average grain diameter of the nano silicon dioxide is 65nm；The average grain of the nano-calcium carbonate
Diameter is 50nm；
The modified methyl jasmonate is prepared according to following technique：Chitosan is added in aqueous acetic acid, stirring
Uniformly obtain material A；Methyl jasmonate is added in absolute ethyl alcohol, is stirring evenly and then adding into material A, is uniformly mixing to obtain object
Expect B；Material B is added in the mixture of atoleine and Tween-80, stirs to get emulsion, it is water-soluble that vanillic aldehyde is then added
5h is stirred at room temperature in liquid, centrifuges, washs, being dried to obtain the modified methyl jasmonate；
In the preparation process of modified methyl jasmonate, chitosan used, methyl jasmonate, vanillic aldehyde weight ratio be 8：
1：1；
The plant antimicrobial is the mixture of pomelo peel, luffa, purple stem boneset extract, plants essential oil；
In the plant antimicrobial, pomelo peel, luffa, purple stem boneset extract, plants essential oil weight ratio be 2：9：
1：1；
The plants essential oil is clove oil.
Embodiment 4
A kind of strawberry proposed by the present invention packs special polyvinyl alcohol preservative film, and raw material includes by weight：Polyethylene
100 portions of alcohol, 21 parts of poly (propylene carbonate), 1.3 parts of fluororesin powder, 7.2 parts of medical stone, 4 parts of zeolite, is received 27 parts of soybean protein
4.7 parts of titanium dioxide of rice, 0.7 part of nano silicon dioxide, 1.8 parts of nano-calcium carbonate, 1.2 parts of bentonite, modified methyl jasmonate 8
Part, 3 parts of plant antimicrobial, 4.3 parts of beta-cyclodextrin, 0.7 part of sorbic acid, 2.7 parts of glycerine, 0.7 part of sodium alginate, polyvinyl pyrrole
1.1 parts of alkanone；
Wherein, the average grain diameter of the medical stone is 20 μm；The average grain diameter of the zeolite is 10 μm；The nano-silica
The average grain diameter for changing titanium is 35nm；The average grain diameter of the nano silicon dioxide is 40nm；The average grain of the nano-calcium carbonate
Diameter is 80nm；
The modified methyl jasmonate is prepared according to following technique：Chitosan is added in aqueous acetic acid, stirring
Uniformly obtain material A；Methyl jasmonate is added in absolute ethyl alcohol, is stirring evenly and then adding into material A, is uniformly mixing to obtain object
Expect B；Material B is added in the mixture of atoleine and Tween-80, stirs to get emulsion, it is water-soluble that vanillic aldehyde is then added
9h is stirred at room temperature in liquid, centrifuges, washs, being dried to obtain the modified methyl jasmonate；
In the preparation process of modified methyl jasmonate, chitosan used, methyl jasmonate, vanillic aldehyde weight ratio be 3：
18：0.4；
The plant antimicrobial is the mixture of pomelo peel, luffa, purple stem boneset extract, plants essential oil；
In the plant antimicrobial, pomelo peel, luffa, purple stem boneset extract, plants essential oil weight ratio be 5：3：
2：0.5；
The plants essential oil is clove oil.
Embodiment 5
A kind of strawberry proposed by the present invention packs special polyvinyl alcohol preservative film, and raw material includes by weight：Polyethylene
100 parts of alcohol, 32 parts of soybean protein, 17 parts of poly (propylene carbonate), 1.5 parts of fluororesin powder, 5 parts of medical stone, zeolite 6 part, nanometer
3.2 parts of titanium dioxide, 1 part of nano silicon dioxide, 1.5 parts of nano-calcium carbonate, 2.3 parts of bentonite, modified methyl jasmonate 6.2
Part, 4.3 parts of plant antimicrobial, 3.2 parts of beta-cyclodextrin, 0.9 part of sorbic acid, 2 parts of glycerine, 0.8 part of sodium alginate, polyvinyl pyrrole
0.9 part of alkanone；
Wherein, the average grain diameter of the medical stone is 15 μm；The average grain diameter of the zeolite is 12 μm；The nano-silica
The average grain diameter for changing titanium is 30nm；The average grain diameter of the nano silicon dioxide is 55nm；The average grain of the nano-calcium carbonate
Diameter is 60nm；
The modified methyl jasmonate is prepared according to following technique：Chitosan is added in aqueous acetic acid, stirring
Uniformly obtain material A；Methyl jasmonate is added in absolute ethyl alcohol, is stirring evenly and then adding into material A, is uniformly mixing to obtain object
Expect B；Material B is added in the mixture of atoleine and Tween-80, stirs to get emulsion, it is water-soluble that vanillic aldehyde is then added
7h is stirred at room temperature in liquid, centrifuges, washs, being dried to obtain the modified methyl jasmonate；
In the preparation process of modified methyl jasmonate, chitosan used, methyl jasmonate, vanillic aldehyde weight ratio be 5：
11：0.6；
The plant antimicrobial is the mixture of pomelo peel, luffa, purple stem boneset extract, plants essential oil；
In the plant antimicrobial, pomelo peel, luffa, purple stem boneset extract, plants essential oil weight ratio be 3：7：
1.5：0.7；
The plants essential oil is clove oil.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of strawberry packs special polyvinyl alcohol preservative film, which is characterized in that its raw material includes by weight：Polyvinyl alcohol
100 parts, 25-40 parts of soybean protein, 8-23 parts of poly (propylene carbonate), 1-2 parts of fluororesin powder, 2-8 parts of medical stone, zeolite 2-9
Part, 2-5 parts of nano-titanium dioxide, 0.5-1.8 parts of nano silicon dioxide, 1-2 parts of nano-calcium carbonate, 1-4 parts of bentonite, modified jasmine
3-9 parts of jasmine acid methyl esters, 2-6 parts of plant antimicrobial, 1-5 parts of beta-cyclodextrin, 0.5-1.5 parts of sorbic acid, 1-3 parts of glycerine, alginic acid
0.3-1.2 parts of sodium, 0.4-1.3 parts of polyvinylpyrrolidone.
2. strawberry packs special polyvinyl alcohol preservative film according to claim 1, which is characterized in that the medical stone is averaged
Grain size is 10-20 μm；The average grain diameter of the zeolite is 10-15 μm；The average grain diameter of the nano-titanium dioxide is 25-
35nm；The average grain diameter of the nano silicon dioxide is 40-65nm；The average grain diameter of the nano-calcium carbonate is 50-80nm.
3. strawberry according to claim 1 or claim 2 packs special polyvinyl alcohol preservative film, which is characterized in that the modified jasmine
Sour methyl esters is prepared according to following technique：Chitosan is added in aqueous acetic acid, material A is uniformly mixing to obtain；By jasmine
Sour methyl esters is added in absolute ethyl alcohol, is stirring evenly and then adding into material A, is uniformly mixing to obtain material B；Liquid is added in material B
In the mixture of paraffin and Tween-80, emulsion is stirred to get, vanillic aldehyde aqueous solution is then added, 5-9h is stirred at room temperature,
It centrifuges, wash, being dried to obtain the modified methyl jasmonate.
4. strawberry packs special polyvinyl alcohol preservative film according to claim 3, which is characterized in that in modified methyl jasmonate
Preparation process in, chitosan used, methyl jasmonate, vanillic aldehyde weight ratio be 3-8：1-18：0.4-1.
5. packing special polyvinyl alcohol preservative film according to any one of the claim 1-4 strawberries, which is characterized in that the plant
Object antiseptic is the mixture of pomelo peel, luffa, purple stem boneset extract, plants essential oil.
6. strawberry packs special polyvinyl alcohol preservative film according to claim 5, which is characterized in that the plant antimicrobial
In, pomelo peel, luffa, purple stem boneset extract, plants essential oil weight ratio be 2-5：3-9：1-2：0.5-1.
7. packing special polyvinyl alcohol preservative film according to the strawberry of claim 5 or 6, which is characterized in that the plants essential oil
For clove oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810520638.6A CN108587018A (en) | 2018-05-28 | 2018-05-28 | A kind of special polyvinyl alcohol preservative film of strawberry packaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810520638.6A CN108587018A (en) | 2018-05-28 | 2018-05-28 | A kind of special polyvinyl alcohol preservative film of strawberry packaging |
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| CN108587018A true CN108587018A (en) | 2018-09-28 |
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ID=63629212
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111777834A (en) * | 2020-07-10 | 2020-10-16 | 浙江大学山东工业技术研究院 | Food preservative film based on polyvinyl alcohol and preparation method thereof |
| WO2021130767A1 (en) * | 2019-12-23 | 2021-07-01 | Greenpod Labs Private Limited | A composition for activating plant's natural defense mechanisms to extend the shelf life and methods thereof |
-
2018
- 2018-05-28 CN CN201810520638.6A patent/CN108587018A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021130767A1 (en) * | 2019-12-23 | 2021-07-01 | Greenpod Labs Private Limited | A composition for activating plant's natural defense mechanisms to extend the shelf life and methods thereof |
| CN111777834A (en) * | 2020-07-10 | 2020-10-16 | 浙江大学山东工业技术研究院 | Food preservative film based on polyvinyl alcohol and preparation method thereof |
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