CN114410042A - Polyvinyl alcohol/polyamide slow water-soluble food packaging film - Google Patents
Polyvinyl alcohol/polyamide slow water-soluble food packaging film Download PDFInfo
- Publication number
- CN114410042A CN114410042A CN202210103980.2A CN202210103980A CN114410042A CN 114410042 A CN114410042 A CN 114410042A CN 202210103980 A CN202210103980 A CN 202210103980A CN 114410042 A CN114410042 A CN 114410042A
- Authority
- CN
- China
- Prior art keywords
- polyamide
- polyvinyl alcohol
- water
- film
- food packaging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004372 Polyvinyl alcohol Substances 0.000 title claims abstract description 63
- 229920002451 polyvinyl alcohol Polymers 0.000 title claims abstract description 63
- 239000004952 Polyamide Substances 0.000 title claims abstract description 58
- 229920002647 polyamide Polymers 0.000 title claims abstract description 58
- 235000013305 food Nutrition 0.000 title claims abstract description 45
- 239000012785 packaging film Substances 0.000 title claims abstract description 32
- 229920006280 packaging film Polymers 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 238000000576 coating method Methods 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 28
- 239000007864 aqueous solution Substances 0.000 claims abstract description 25
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 42
- 239000000243 solution Substances 0.000 claims description 27
- 238000006136 alcoholysis reaction Methods 0.000 claims description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 18
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Natural products OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 18
- -1 citric acid ester Chemical class 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 14
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 10
- 239000004327 boric acid Substances 0.000 claims description 10
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 9
- 239000007822 coupling agent Substances 0.000 claims description 9
- 239000003085 diluting agent Substances 0.000 claims description 9
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 9
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 9
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 9
- 239000004305 biphenyl Substances 0.000 claims description 8
- 235000010290 biphenyl Nutrition 0.000 claims description 8
- 125000006267 biphenyl group Chemical group 0.000 claims description 8
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 8
- 229920001296 polysiloxane Polymers 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 abstract description 16
- 239000002699 waste material Substances 0.000 abstract description 11
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 8
- 235000013372 meat Nutrition 0.000 abstract description 4
- 235000013410 fast food Nutrition 0.000 abstract description 3
- 231100000252 nontoxic Toxicity 0.000 abstract description 3
- 230000003000 nontoxic effect Effects 0.000 abstract description 3
- 235000013399 edible fruits Nutrition 0.000 abstract description 2
- 235000014594 pastries Nutrition 0.000 abstract description 2
- 230000008635 plant growth Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000009967 tasteless effect Effects 0.000 abstract description 2
- 235000015895 biscuits Nutrition 0.000 abstract 1
- 235000011869 dried fruits Nutrition 0.000 abstract 1
- 235000012054 meals Nutrition 0.000 abstract 1
- 235000014347 soups Nutrition 0.000 abstract 1
- 239000010408 film Substances 0.000 description 49
- 238000009501 film coating Methods 0.000 description 15
- 239000007888 film coating Substances 0.000 description 14
- 238000012360 testing method Methods 0.000 description 13
- 238000002360 preparation method Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 239000003921 oil Substances 0.000 description 6
- 235000019198 oils Nutrition 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000002791 soaking Methods 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 235000015112 vegetable and seed oil Nutrition 0.000 description 4
- 235000013311 vegetables Nutrition 0.000 description 4
- 235000019483 Peanut oil Nutrition 0.000 description 3
- 235000015278 beef Nutrition 0.000 description 3
- 239000004359 castor oil Substances 0.000 description 3
- 235000019438 castor oil Nutrition 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 239000002655 kraft paper Substances 0.000 description 3
- 239000010699 lard oil Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000005022 packaging material Substances 0.000 description 3
- 239000000312 peanut oil Substances 0.000 description 3
- 239000003549 soybean oil Substances 0.000 description 3
- 235000012424 soybean oil Nutrition 0.000 description 3
- 239000003760 tallow Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000007539 photo-oxidation reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 229920002160 Celluloid Polymers 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000012010 growth Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 238000009463 water soluble packaging Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2429/00—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
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/11—Esters; Ether-esters of acyclic polycarboxylic acids
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/521—Esters of phosphoric acids, e.g. of H3PO4
Abstract
The invention provides a polyvinyl alcohol/polyamide slow water-soluble food packaging film which is prepared by coating a coating liquid prepared from polyvinyl alcohol and polyamide. The film can be directly used for packaging foods, meats, fruits, dried fruits, fast food, food pastries and biscuits, and can also be used for packaging hot dishes, hot meals, hot soup and the like by using a film with hot water resistance, and belongs to a nontoxic, tasteless and environment-friendly film. The waste after the film is used can be immersed in water with different temperatures according to the water solubility and can be directly discharged after being changed into water soluble substances, or can be taken out after water absorption and kneaded into a ball shape (or a cake shape) for recycling, so that the white pollution of the waste is solved. The aqueous solution can also be discharged directly and contribute to plant growth.
Description
Technical Field
The invention belongs to the technical field of new film materials, and particularly relates to a polyvinyl alcohol/polyamide slow water soluble food packaging film.
Background
Along with the improvement of living standard of people, the consumption of plastic packaging film products in food processing industry and food retail industry is increasing day by day, food packaging bags, food shopping bags, fish meat, vegetables, fast food industry and food bags which are used in daily life are made of polyolefin materials, and packaging materials which do not meet the food safety requirements are also mixed into the market, some of the edible films are nontoxic, some of the edible films are toxic, can not be quickly dissolved in water in a short time after being discarded and belong to water-insoluble films, so that wastes are caused to float with wind in garbage yards and natural environments, serious pollution is caused to urban environments, natural environments, rivers, lakes and seas, white pollution caused by waste plastics is urgently solved, and the performance and the degradability of the original food packaging films, the requirements of environmental protection are far from being met.
Disclosure of Invention
The invention aims to provide a polyvinyl alcohol/polyamide slow water-soluble food packaging film to solve the existing problems.
The polyvinyl alcohol/polyamide slow water-soluble food packaging film provided by the invention is prepared by coating polyvinyl alcohol/polyamide blend liquid, wherein the blended coating liquid comprises the following components in percentage by mass:
40% -55% of polyvinyl alcohol aqueous solution;
30% -50% of polyamide ethanol solution;
1% -3% of citric acid ester;
0.5 to 1 percent of chelating titanate coupling agent;
1% -5% of polyvinylpyrrolidone;
0.2% -1% of diphenyl polysiloxane;
0.05 to 0.5 percent of tributyl phosphate;
0.2% -0.8% of silicon dioxide;
3% -5% of boric acid aqueous solution;
the rest of the diluent;
wherein the diluent is prepared from the following components in parts by mass: 10 of water and ethanol.
The invention has the advantages that:
the water-soluble substance of the polyvinyl alcohol/polyamide slow water-soluble food packaging film belongs to a nontoxic, tasteless and degradable material, is harmless to soil and plants, and can be quickly degraded by microorganisms in a natural environment.
The waste of the polyvinyl alcohol/polyamide slow water-soluble food packaging film can be quickly photodegraded and hydrolyzed after being wetted by illumination and water in the nature. The film quickly becomes fragmented and granular, eliminating "white contamination".
The hydrolysate of the waste of the polyvinyl alcohol/polyamide slow water-soluble food packaging film in nature has no harm to water and soil, and the polyvinyl alcohol has the functions of moisturizing, water retention and aggregation on the soil, thereby being beneficial to plant growth.
The polyvinyl alcohol/polyamide slow water soluble food packaging film also has good barrier property to oxygen and carbon dioxide, and under the environment with the environment temperature of 25 ℃, the oxygen transmittance is almost zero, and the carbon dioxide transmittance is only 0.02 g/square meter, so the film also has the functions of keeping food fresh and quality.
Detailed Description
The invention relates to a polyvinyl alcohol/polyamide slow water-soluble food packaging film, which is prepared by taking a mixed solution of a polyvinyl alcohol aqueous solution and an alcohol-soluble polyamide solution as a coating solution and coating the coating solution.
The coating liquid comprises the following components in percentage by mass:
40% -55% of polyvinyl alcohol aqueous solution; 30% -50% of polyamide ethanol solution; 1% -3% of citric acid ester; 0.5 to 1 percent of chelating titanate coupling agent; 1% -5% of polyvinylpyrrolidone; 0.2% -1% of diphenyl polysiloxane; 0.05 to 0.5 percent of tributyl phosphate; 0.2% -0.8% of silicon dioxide; 3% -5% of boric acid aqueous solution; the rest of the diluent; wherein the diluent is prepared from the following components in parts by mass: 10 of water and ethanol.
Preferably: the film coating liquid component comprises 40-50% of polyvinyl alcohol aqueous solution, preferably 42-50%, more preferably 45-48%.
Preferably: the alcoholysis degree of the polyvinyl alcohol in the polyvinyl alcohol aqueous solution comprises 87-89%, 75-80% and 99-99.8%, the molecular weight is 30000-60000, the solid content of the aqueous solution is 40-50%, and the Brookfield viscosity is 100 MPa.s-500 MPa.s. Preferably, the alcoholysis degree is 87.5-88.5%, 77-78% and 99.5-99.6%, the molecular weight is 40000-50000, the solid content of the aqueous solution is 43-45%, and the Brookfield viscosity is 100-250 MPa-s.
Preferably: the film coating liquid comprises 30-50% of polyamide ethanol solution, preferably 35-45%, and more preferably 38-42%. The polyamide is preferably low in melting point and is alcohol soluble, the specific viscosity is 1.6-1.8, the fineness is 40-80 meshes, the moisture content is less than 3%, and in the embodiment of the invention, the polyamide is purchased from Shanghai celluloid company products, and other similar products can be selected.
Preferably: the film coating liquid component comprises 1% -3% of citric acid ester, preferably 1.5% -2.8%, and more preferably 2% -2.5%.
Preferably: the film coating liquid comprises 0.5-1% of chelating titanate coupling agent, preferably 0.6-0.9%, more preferably 0.7-0.8%.
Preferably: the film coating liquid component comprises 1% -5% of polyvinylpyrrolidone, preferably 1.5% -4%, more preferably 2% -3%.
Preferably: the film coating liquid component comprises 0.2-1% of diphenyl polysiloxane, preferably 0.4-0.9%, and more preferably 0.5-0.8%.
Preferably: the film coating liquid component comprises 0.05-0.5% of tributyl phosphate, preferably 0.1-0.4%, and more preferably 0.3-0.35%.
Preferably: the thin film coating liquid component comprises 0.2-0.8% of silicon dioxide, preferably 0.3-0.7%, and more preferably 0.4-0.6%.
Preferably: the film coating liquid comprises 3% -5% of boric acid aqueous solution, preferably 4% -4.5%, and more preferably 4.2% -4.3%.
Preferably: the film coating liquid component comprises a diluent, and the diluent component comprises 90% of water and 10% of ethanol which are blended solutions. The water is ionized water or distilled water, the ethanol is industrial ethanol, and the alcohol degree is 95%.
The preparation methods of the polyvinyl alcohol aqueous solution and the polyamide ethanol solution are well known to those skilled in the art and are not described in detail herein.
Preparation of coating liquid:
adding the polyamide ethanol solution into the polyvinyl alcohol aqueous solution, starting a mixer, mixing for 10-20 min at the speed of 120r/min, and fully and uniformly mixing. Then, sequentially adding citric acid, chelating titanate coupling agent, polyvinylpyrrolidone, diphenyl polysiloxane, silicon dioxide and boric acid aqueous solution under stirring, heating to 40-50 ℃, and continuously mixing for 30-60 min. Adding a proper amount of solvent (water: ethanol: 9: 10), mixing for 5min-10min, adjusting the solid content of the coating liquid to 40% -50%, preferably 45%, adding tributyl phosphate, mixing at the same speed for 10min, stopping mixing, and standing for 2h-3 h. And filtering to obtain the coating liquid of the polyvinyl alcohol/polyamide slow water soluble packaging film.
In the present invention, the polyvinyl alcohol/polyamide slow water soluble type food packaging film is prepared by a film coating process well known to those skilled in the art. The process is not particularly limited.
Preferably: the coating thickness of the polyvinyl alcohol/polyamide slow water-soluble food packaging film is 20-50 um. In the present embodiment, the film coating thickness is preferably 20um, 25um, 30um, 35um, 40um, 45um, 50um.
Preferably: the polyvinyl alcohol/polyamide slow water-soluble food packaging film is characterized in that three water-soluble films are respectively coated according to alcoholysis degree of polyvinyl alcohol, wherein the three water-soluble films are respectively as follows:
1. the film with alcoholysis degree of 87-89% is a cold water and hot water soluble film.
2. The film with 75-80% alcoholysis degree is only soluble in cold water and insoluble in hot water.
3. The film with alcoholysis degree of 99-99.8% can only be dissolved in hot water with temperature above 95 ℃ and not dissolved in cold water.
Preferably: the polyvinyl alcohol/polyamide slow water soluble food packaging film finished product is rewound and dried at the drying temperature of 40 +/-3 ℃, after drying, trimming, rolling, packaging and packaging are carried out, the film is placed still for 72 hours at the normal temperature of 20-30 ℃ before packaging, the inner layer of the packaging material is moistureproof wax-coated kraft paper, and the outer layer of the packaging material is PP film sealed packaging.
The invention tests the water solubility of the three water-soluble films, and the test method comprises the following steps: the polyvinyl alcohol/polyamide slow water soluble type film with alcoholysis degree of 87% -89% was attached to the plastic frame at four sides, immersed in cold water and hot water containers, respectively, the water soluble condition was observed, and the test results were recorded as table (one). Four sides of the polyvinyl alcohol/polyamide slow water-soluble film with 75% -80% alcoholysis degree are attached to a plastic frame, and the film is respectively immersed into a cold water container and a hot water container, the water-soluble condition is observed, and the test results are recorded as shown in the table (II). Four sides of the polyvinyl alcohol/polyamide slow water-soluble film with the alcoholysis degree of 99-99.8% are attached to a plastic frame, the film is respectively immersed in a cold water container and a hot water container, the water-soluble condition is observed, and the test result is recorded as shown in the table (III).
Water solubility test results for films with alcoholysis degree of 87% -89%
| Thickness of film | Water temperature deg.C | 15h | 17 h | 20 h | 25 h | 30 h | 35 h | 40 h | 45 h | 50 h |
| 20um | 15℃ | 20% | 40% | 60% | 80% | Dissolving in water | ||||
| 35um | 15℃ | 20% | 35% | 53% | 68% | 80% | Dissolving in water | |||
| 50um | 15℃ | 20% | 35% | 50% | 65% | 75% | 85% | Dissolving in water | ||
| 20um | 80℃ | Dissolving in water | ||||||||
| 35um | 80℃ | Dissolving in water | ||||||||
| 50um | 80℃ | Dissolving in water |
Film water solubility test results with 75% -80% of epi (di) alcoholysis degree
| Thickness of film | Water temperature deg.C | 15h | 17 h | 20 h | 25 h | 30 h | 35 h | 40 h | 45 h | 50 h |
| 20um | 15℃ | 20% | 40% | 60% | 80% | Dissolving in water | ||||
| 35um | 15℃ | 20% | 35% | 50% | 60% | 80% | Dissolving in water | |||
| 50um | 15℃ | 20% | 35% | 48% | 70% | 80% | 90% | 95% | Dissolving in water | |
| 20um | 35℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 35um | 35℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 50um | 35℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 20um | 75℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 35um | 75℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 50um | 75℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Film water solubility test result with 99% -99.8% of surface (tri) alcoholysis degree
| Thickness of film | Water temperature deg.C | 15h | 10h | 15h | 20h | 25h | 30h | 35h | 40h | 45h | 50h |
| 20um | 15℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 35um | 15℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 50um | 15℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 20um | 65℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 35um | 65℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 50um | 65℃ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 20um | 95℃ | 50% | 80% | Dissolving in water | Dissolving in water | Dissolving in water | |||||
| 35um | 95℃ | 46% | 80% | 90% | Dissolving in water | Dissolving in water | |||||
| 50um | 95℃ | 40% | 70% | 80% | 90% | Dissolving in water |
The test results show that:
1. when the alcoholysis degree of the polyvinyl alcohol in the film component is 87% -89%, the water absorption of the film with the thickness of 20-50 um is 100% in cold water for 30-40 h, and 100% in hot water at 75 ℃ for 15-17 h, and the film is completely dissolved in the water to become a water-soluble substance. That is, films with a degree of alcoholysis of polyvinyl alcohol of 87% to 89% are soluble in both cold and hot water.
2. When the alcoholysis degree of polyvinyl alcohol in the film component is 75-80%, soaking the film with the thickness of 20-50 um in hot water at 75 ℃ for 50h, wherein the water absorption rate is 0; soaking in water at 35 ℃ for 50h to absorb O; soaking in cold water at 15 ℃ for 25-45 h, wherein the water absorption rate is 10O%; and all dissolved in water to become a water-soluble substance. The film with 75% -80% alcoholysis degree is only dissolved in cold water.
3. When the alcoholysis degree of polyvinyl alcohol in the film component is 99-99.8%, soaking the film with the thickness of 20-50 um in cold water and hot water at 15-65 ℃ for 50h, wherein the water absorption rate is 0; soaking in 95 deg.C water for 15-25 h to obtain water soluble extract. The film with alcoholysis degree of 99-99.8% is only dissolved in hot water with temperature above 95 ℃.
And (3) carrying out oil resistance test on the polyvinyl alcohol film, wherein the test method comprises the following steps: films of different thickness were immersed in oil separately for oil absorption.
Oil solubility test results for film
| Thickness of film | Ambient temperature | Vegetable oil | Animal oil | 2 days | 4 days | 6 days | 8 days | 10 days | 12 days | 15 days |
| 20um | 30℃ | Soybean oil | 0.003 | 0.01 | 0.03 | 0.06 | 0.07 | 0.08 | 0.1 | |
| 35um | 30℃ | Soybean oil | 0.003 | 0.01 | 0.03 | 0.06 | 0.07 | 0.08 | 0.1 | |
| 50um | 30℃ | Soybean oil | 0.003 | 0.01 | 0.03 | 0.06 | 0.07 | 0.08 | 0.1 | |
| 20um | 30℃ | Peanut oil | 0.003 | 0.01 | 0.03 | 0.07 | 0.09 | 0.12 | 0.14 | |
| 35um | 30℃ | Peanut oil | 0.003 | 0.01 | 0.03 | 0.07 | 0.09 | 0.12 | 0.14 | |
| 50um | 30℃ | Peanut oil | 0.003 | 0.01 | 0.03 | 0.07 | 0.09 | 0.12 | 0.14 | |
| 20um | 30℃ | Vegetable seed oil | 0.002 | 0.005 | 0.01 | 0.05 | 0.07 | 0.08 | 0.1 | |
| 35um | 30℃ | Vegetable seed oil | 0.002 | 0.005 | 0.01 | 0.05 | 0.07 | 0.08 | 0.1 | |
| 50um | 30℃ | Vegetable seed oil | 0.002 | 0.005 | 0.01 | 0.05 | 0.07 | 0.08 | 0.1 | |
| 20um | 30℃ | Castor oil | 0.001 | 0.003 | 0.005 | 0.008 | 0.01 | 0.04 | 0.07 | |
| 35um | 30℃ | Castor oil | 0.001 | 0.003 | 0.005 | 0.008 | 0.01 | 0.04 | 0.07 | |
| 50um | 30℃ | Castor oil | 0.001 | 0.003 | 0.005 | 0.008 | 0.01 | 0.04 | 0.07 | |
| 20um | 50℃ | Lard oil | 0.004 | 0.005 | 0.006 | 0.007 | 0.0075 | 0.008 | 0.01 | |
| 35um | 50℃ | Lard oil | 0.004 | 0.005 | 0.006 | 0.007 | 0.0075 | 0.008 | 0.01 | |
| 50um | 50℃ | Lard oil | 0.004 | 0.005 | 0.006 | 0.007 | 0.0075 | 0.008 | 0.01 | |
| 20um | 50℃ | Beef tallow | 0.004 | 0.005 | 0.006 | 0.007 | 0.0075 | 0.008 | 0.01 | |
| 35um | 50℃ | Beef tallow | 0.004 | 0.005 | 0.006 | 0.007 | 0.0075 | 0.008 | 0.01 | |
| 50um | 50℃ | Beef tallow | 0.004 | 0.005 | 0.006 | 0.007 | 0.0075 | 0.008 | 0.01 | |
| 20um | 50℃ | Mutton fat | 0.004 | 0.005 | 0.006 | 0.007 | 0.0075 | 0.008 | 0.01 | |
| 35um | 50℃ | Mutton fat | 0.004 | 0.005 | 0.006 | 0.007 | 0.0075 | 0.008 | 0.01 | |
| 50um | 50℃ | Mutton fat | 0.004 | 0.005 | 0.006 | 0.007 | 0.0075 | 0.008 | 0.01 |
In the above tests, only the film having a film thickness of 20um to 50um was tested. As can be seen from the test results, the overall oil absorption was low and the film thickness had substantially no effect on oil absorption. The results were the same by testing films of different degrees of alcoholysis. Therefore, the film can be used for packaging oily food.
After the polyvinyl alcohol/polyamide slow water-soluble food packaging film is used, the polyvinyl alcohol/polyamide slow water-soluble food packaging film can be dissolved in water at different water temperatures according to the water-soluble property of different alcoholysis degrees, and water-soluble substances can be directly discharged. In nature, the waste film can also be naturally degraded by photooxidation or by microorganisms, thus preventing 'white pollution'.
The foregoing are merely exemplary embodiments of the present invention and are not to be construed as limiting the scope of the invention.
To further illustrate the present invention, the present invention will now be described in detail by way of examples 1 to 3.
Example 1 to example 3
The polyvinyl alcohol/polyamide slow water-soluble food packaging film comprises the following coating liquid formula components in percentage by mass:
| formulation components | Range of ratios | Example 1 | Example 2 | Example 3 |
| Aqueous polyvinyl alcohol solution | 40%—55% | 55% | 45% | 40% |
| Polyamide ethanol solution | 30%—50% | 30% | 40% | 50% |
| Citric acid esters | 1%—3% | 3% | 1.5% | 1% |
| Chelate titanate coupling agent | 0.5%—1% | 0.5% | 1% | 0.7% |
| Polyvinylpyrrolidone | 1%—5% | 5% | 3.5% | 1% |
| Diphenylpolysiloxanes | 0.2%—1% | 0.2% | 1% | 0.5% |
| Phosphoric acid tributyl ester | 0.05%—0.5% | 0.05% | 1% | 0.45% |
| Silicon dioxide | 0.2%—0.8% | 0.8% | 0.5% | 0.2% |
| Boric acid aqueous solution (30% strength) | 3%—5% | 3% | 4% | 5% |
| Diluent (water: ethanol ═ 90: 10) | Proper amount of | Proper amount of | Proper amount of | Proper amount of |
Example 1
In example 1, the aqueous polyvinyl alcohol solution had a solids content of 40%, a molecular weight of 40000 and a degree of alcoholysis of 87% to 89%. The polyamide aqueous solution had a solid content of 30%. The film coating thickness was 30 um.
Example 1 coating liquid preparation and film preparation:
55 parts of a polyvinyl alcohol aqueous solution was placed in a mixer, and 30 parts of a polyamide ethanol solution was slowly injected and mixed at a rate of 120r/min for 10 min. Then adding 3 parts of citric acid ester, 0.5 part of chelating titanate coupling agent, 5 parts of polyvinylpyrrolidone, 0.2 part of diphenyl polysiloxane, 0.8 part of silicon dioxide and 3 parts of boric acid aqueous solution in sequence, continuously mixing for 30min at the mixing temperature of 40 ℃, adjusting the solid content of the solution to be 40% (heating by adopting an interlayer and strictly heating by steam), and adding a proper amount of water until the solution is qualified. Finally, the viscosity of the solution is adjusted to 40s/25 ℃ (coating-4 cups), and finally, 0.05 part of tributyl phosphate is added, mixed for 5min and kept stand for 120min to obtain the coating liquid.
Preparing the coating liquid into a polyvinyl alcohol/polyamide slow water-soluble food packaging film with the thickness of 30 mu m by adopting a coating method, standing for 72h, cutting edges, rolling, packaging the inner layer by using waxed kraft paper, and sealing and packaging the outer layer by using PP plastic.
Example 2
In example 2, the aqueous polyvinyl alcohol solution had a solid content of 42%, a molecular weight of 35000, and a degree of alcoholysis of 75% to 80%. The polyamide aqueous solution had a solids content of 40%. The film coating thickness was 35 um.
Example 2 coating liquid preparation and film preparation:
45 parts of an aqueous polyvinyl alcohol solution was placed in a mixer, and 40 parts of a polyamide ethanol solution was slowly injected and mixed at a rate of 150r/min for 10 min. Then sequentially adding 1.5 parts of citric acid ester, 1 part of chelating titanate coupling agent, 3.5 parts of polyvinylpyrrolidone, 1 part of diphenyl polysiloxane, 0.5 part of silicon dioxide and 4 parts of boric acid aqueous solution, continuously mixing for 35min at the mixing temperature of 42 ℃, adjusting the temperature of the mixture (interlayer heating and steam heating strictly forbidden) to 42% of solid content and viscosity of 42s/25 ℃ (coating in 4 cups), finally adding 1 part of tributyl phosphate, mixing for 5min, and standing for 120min to obtain the coating liquid.
Preparing the coating liquid into a polyvinyl alcohol/polyamide slow water-soluble food packaging film with the thickness of 35 mu m by a coating method, standing for 72h, cutting edges, rolling, packaging the inner layer by using waxed kraft paper, and sealing and packaging the outer layer by using PP plastic.
Example 3
In example 3, the aqueous polyvinyl alcohol solution had a solids content of 47%, a molecular weight of 45000, and a degree of alcoholysis of 99% to 99.8%. The solid content of the aqueous polyamide solution was 50%. The film coating thickness was 45 um.
Example 3 coating liquid preparation and film preparation:
40 parts of an aqueous polyvinyl alcohol solution was placed in a mixer, and 50 parts of a polyamide ethanol solution was slowly injected and mixed at a rate of 180r/min for 5 min. Then sequentially adding 1 part of citric acid ester, 0.7 part of chelating titanate coupling agent, 1 part of polyvinylpyrrolidone, 0.5 part of diphenyl polysiloxane, 0.2 part of silicon dioxide and 5 parts of boric acid aqueous solution, continuously mixing for 37min, adjusting the mixing temperature to 45 ℃ (interlayer heating and steam heating strictly), adjusting the solid content to 45% and the viscosity to 45s/25 ℃ (coating in 4 cups), finally adding 0.45 part of tributyl phosphate, mixing for 5min, and standing for 120min to obtain the coating liquid.
Preparing the coating liquid into a polyvinyl alcohol/polyamide slow water-soluble food packaging film with the thickness of 40um by a coating method, standing for 72 hours, and then cutting edges, rolling and packaging.
The performance tests of the embodiments 1 to 3 fall into the values shown in the tables (i) to (iv), and are not described herein again.
The polyvinyl alcohol/polyamide slow water soluble food packaging film is widely applicable to packaging of direct contact food in the food industry, the retail food industry, beverages, pastries, meat, cooked meat food and the like and manufacturing of various convenient bags. It is also suitable for packaging dry food and dry fruit, and is also suitable for packaging various fast food industry, and has wide application.
The waste after the polyvinyl alcohol/polyamide slow water-soluble food packaging film is used can be soaked into water at corresponding temperature according to the water-soluble property of different alcoholysis degrees to be dissolved into water-soluble substances for discharge. Or taking out the mixture after swelling and kneading the mixture into a ball shape for recycling, wherein the recovered product can be directly ground into powder and added into the water-based wall paint for use.
The polyvinyl alcohol/polyamide slow water-soluble food packaging film waste can be rapidly degraded in nature through photooxidation and hydrolysis, and the water-soluble substance of the waste has no harm to soil and plants, and can store water in the soil and promote growth of valuable substances.
The polyvinyl alcohol/polyamide slow water-soluble food packaging film disclosed by the invention is harmless to equipment environment and users in the production process, eliminates white pollution by wastes, is harmless to the environment, and belongs to an environment-friendly product.
The above are only specific embodiments of the present invention, and it is obvious to those skilled in the art that several modifications and improvements can be made, and these should be considered as falling within the protection scope of the present invention.
Claims (6)
1. A polyvinyl alcohol/polyamide slow water-soluble food packaging film is characterized in that: the film is prepared by blending polyvinyl alcohol and polyamide and then coating;
the blended coating liquid comprises the following components in percentage by mass:
40% -55% of polyvinyl alcohol aqueous solution;
30% -50% of polyamide ethanol solution;
1% -3% of citric acid ester;
0.5 to 1 percent of chelating titanate coupling agent;
1% -5% of polyvinylpyrrolidone;
0.2% -1% of diphenyl polysiloxane;
0.05 to 0.5 percent of tributyl phosphate;
0.2% -0.8% of silicon dioxide;
3% -5% of boric acid aqueous solution;
the rest of the diluent;
wherein the diluent is prepared from the following components in parts by mass: 10 of water and ethanol.
2. The polyvinyl alcohol/polyamide slow water soluble food packaging film of claim 1, wherein: the alcoholysis degree of the polyvinyl alcohol in the polyvinyl alcohol aqueous solution comprises the following steps: 87% -89%; 75-80% and 99-99.8%; molecular weight is 30000-60000; the solid content of the aqueous solution is 40-50%, and the Brookfield viscosity is 100MPa s-500MPa s.
3. The polyvinyl alcohol/polyamide slow water soluble food packaging film of claim 1, wherein: the melting point of polyamide in the polyamide ethanol solution is less than 130 ℃, the polyamide in the polyamide ethanol solution is alcohol-soluble, the specific viscosity is 1.6-1.8, the fineness is 40-80 meshes, and the water content is less than 3%.
4. The polyvinyl alcohol/polyamide slow water soluble food packaging film of claim 1, wherein: the concentration of the aqueous boric acid solution was 30%.
5. The polyvinyl alcohol/polyamide slowly water soluble film of claim 1, wherein: the solid content of the coating liquid is 40-50%, and the Brookfield viscosity is 100MPa s-300MPa s.
6. The polyvinyl alcohol/polyamide slowly water soluble film of claim 1, wherein: the coating thickness of the film is 20um-50 um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210103980.2A CN114410042A (en) | 2022-01-28 | 2022-01-28 | Polyvinyl alcohol/polyamide slow water-soluble food packaging film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210103980.2A CN114410042A (en) | 2022-01-28 | 2022-01-28 | Polyvinyl alcohol/polyamide slow water-soluble food packaging film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114410042A true CN114410042A (en) | 2022-04-29 |
Family
ID=81279608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210103980.2A Pending CN114410042A (en) | 2022-01-28 | 2022-01-28 | Polyvinyl alcohol/polyamide slow water-soluble food packaging film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114410042A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845185A (en) * | 2009-03-25 | 2010-09-29 | 刘建林 | PVA alloy capable of being processed with thermoplasticity method and manufacture technology thereof |
| US20180360055A1 (en) * | 2015-09-01 | 2018-12-20 | Obschestvo S Ogranichennoi Otvetstvennostyu "Proizvodstvenno-Kommercheskaya Firma "Atlantis-Pak" | Single- or multilayer film comprising bonded polyvinyl alcohol |
| CN109181284A (en) * | 2018-07-10 | 2019-01-11 | 武汉工程大学 | A kind of complete biodegradable high-barrier polyamide-based composite film material and preparation method thereof |
| CN109517378A (en) * | 2018-11-13 | 2019-03-26 | 上海耐特复合材料制品有限公司 | A kind of barrier property blend, molded article and its preparation method and application |
-
2022
- 2022-01-28 CN CN202210103980.2A patent/CN114410042A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845185A (en) * | 2009-03-25 | 2010-09-29 | 刘建林 | PVA alloy capable of being processed with thermoplasticity method and manufacture technology thereof |
| CN102361930A (en) * | 2009-03-25 | 2012-02-22 | 刘建林 | Thermoplastically processable polyvinyl alcohol alloy and preparation method thereof |
| US20180360055A1 (en) * | 2015-09-01 | 2018-12-20 | Obschestvo S Ogranichennoi Otvetstvennostyu "Proizvodstvenno-Kommercheskaya Firma "Atlantis-Pak" | Single- or multilayer film comprising bonded polyvinyl alcohol |
| CN109181284A (en) * | 2018-07-10 | 2019-01-11 | 武汉工程大学 | A kind of complete biodegradable high-barrier polyamide-based composite film material and preparation method thereof |
| CN109517378A (en) * | 2018-11-13 | 2019-03-26 | 上海耐特复合材料制品有限公司 | A kind of barrier property blend, molded article and its preparation method and application |
Non-Patent Citations (2)
| Title |
|---|
| 吴嘉威: "尼龙610／聚 乙 烯醇生质共 混材料相容、 阻隔与活性包装性能研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》, vol. 1, no. 4, pages 020 - 103 * |
| 彭治汉等: "《塑料工程手册（上、下册）》", vol. 1, 中国医药科技出版社, pages: 114 - 103 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112280067B (en) | Preparation method of edible antibacterial film | |
| CN108070103B (en) | Degradable antibacterial composite preservative film and preparation method thereof | |
| CN102643554B (en) | Edible fishskin collagen antibiosis membrane and preparing method thereof | |
| CN103275358A (en) | Method for preparing chitosan-based composite preservative film or coating | |
| CN102020790B (en) | Natural polymer film material with adjustable degradation rate and preparation method | |
| CN110964331A (en) | Naturally biodegradable composite edible water-soluble packaging film and preparation method thereof | |
| CN101177494A (en) | Method for preparing chitosan complex film using glycerin and stearic acid as plasticizer | |
| CN109258645B (en) | Antibacterial fresh-keeping gel containing betaine and preparation method thereof | |
| CN102334545B (en) | Aspergillus flavus infection-resistant peanut-coating storage method | |
| CN101999441A (en) | Preparation method of fruit and vegetable coating preservative | |
| CN105585803A (en) | Breathable fresh-keeping film with degrading capability and preparation method of breathable fresh-keeping film | |
| CN111011874A (en) | Natural biodegradable composite edible tubular product and preparation method thereof | |
| CN109233001A (en) | A kind of edible food packaging film and preparation method thereof | |
| CN110747071A (en) | Fruit and vegetable pesticide residue cleaning agent and preparation method thereof | |
| CN107245185A (en) | A kind of nano-antimicrobial preservative film for fruits and vegetables and preparation method thereof | |
| CN112409615A (en) | Preservative film containing peanut coat procyanidine inclusion compound and preparation method thereof | |
| CN113045802A (en) | Edible blueberry anthocyanin composite film and preparation method thereof | |
| CN107581448A (en) | Natural anti-mildew antistaling coating and its preparation method and application | |
| CN114410042A (en) | Polyvinyl alcohol/polyamide slow water-soluble food packaging film | |
| CN114573884A (en) | Preparation method and application of natural edible fruit and vegetable fresh-keeping packaging film | |
| US20220289999A1 (en) | Biodegradable material | |
| CN108342042A (en) | A kind of preservative film and preparation method thereof | |
| CN106750569A (en) | A kind of compound edible film of polysaccharide/tara gum and preparation method thereof | |
| CN111423679A (en) | Preparation method of degradable food fresh-keeping bag with fish scale gelatin as matrix | |
| CN109463433A (en) | A kind of preparation method with inoxidizability emulsion film agent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |