CN116333396A - Water-absorbing and water-retaining packaging material and preparation method and application thereof - Google Patents
Water-absorbing and water-retaining packaging material and preparation method and application thereof Download PDFInfo
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- CN116333396A CN116333396A CN202310053687.4A CN202310053687A CN116333396A CN 116333396 A CN116333396 A CN 116333396A CN 202310053687 A CN202310053687 A CN 202310053687A CN 116333396 A CN116333396 A CN 116333396A
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- 239000005022 packaging material Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims abstract description 42
- 235000012055 fruits and vegetables Nutrition 0.000 claims abstract description 30
- 239000011347 resin Substances 0.000 claims abstract description 29
- 229920005989 resin Polymers 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000002346 layers by function Substances 0.000 claims abstract description 22
- 239000000084 colloidal system Substances 0.000 claims abstract description 17
- 238000005507 spraying Methods 0.000 claims abstract description 17
- 239000004848 polyfunctional curative Substances 0.000 claims abstract description 16
- 239000002250 absorbent Substances 0.000 claims abstract description 11
- 238000003851 corona treatment Methods 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- -1 polyethylene Polymers 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- 238000010073 coating (rubber) Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229920002545 silicone oil Polymers 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 3
- 229920002554 vinyl polymer Polymers 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 150000001412 amines Chemical class 0.000 claims description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 2
- 229920000098 polyolefin Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 229920006300 shrink film Polymers 0.000 claims 1
- 238000004806 packaging method and process Methods 0.000 abstract description 22
- 230000029058 respiratory gaseous exchange Effects 0.000 abstract description 2
- 235000002566 Capsicum Nutrition 0.000 description 49
- 241000758706 Piperaceae Species 0.000 description 41
- 239000000306 component Substances 0.000 description 23
- 238000005516 engineering process Methods 0.000 description 9
- 239000006002 Pepper Substances 0.000 description 8
- 241000722363 Piper Species 0.000 description 8
- 235000016761 Piper aduncum Nutrition 0.000 description 8
- 235000017804 Piper guineense Nutrition 0.000 description 8
- 235000008184 Piper nigrum Nutrition 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 8
- 229920000092 linear low density polyethylene Polymers 0.000 description 6
- 239000004707 linear low-density polyethylene Substances 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000499 gel Substances 0.000 description 3
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000003020 moisturizing effect Effects 0.000 description 2
- 229920006280 packaging film Polymers 0.000 description 2
- 239000012785 packaging film Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229920006257 Heat-shrinkable film Polymers 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 229920006378 biaxially oriented polypropylene Polymers 0.000 description 1
- 239000011127 biaxially oriented polypropylene Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000004320 controlled atmosphere Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009447 edible packaging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010101 extrusion blow moulding Methods 0.000 description 1
- 235000021022 fresh fruits Nutrition 0.000 description 1
- 229920001002 functional polymer Polymers 0.000 description 1
- 239000000017 hydrogel Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 235000013311 vegetables Nutrition 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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D163/10—Epoxy resins modified by unsaturated compounds
-
- 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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
-
- 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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- 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
- C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
-
- 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
- C08J2463/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
- C08J2463/10—Epoxy resins modified by unsaturated compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Packages (AREA)
- Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
Abstract
The invention provides a water-absorbing and water-retaining packaging material, a preparation method and application thereof, and the water-absorbing and water-retaining packaging material comprises a base material and a functional layer, wherein the base material is a waterproof film, the functional layer is prepared from 10-30 parts by weight of a colloid A component, 10-40 parts by weight of a hardener B component, 10-30 parts by weight of ethyl acetate and 20-40 parts by weight of water-absorbing resin, and the functional layer is coated on the surface of the base material in a spraying mode. The invention can be used for storing fruits and vegetables, can enable water vapor generated by respiration of fruits and vegetables to be absorbed by the water-absorbent resin in the functional layer, and can slowly release the water vapor when the humidity of the water-absorbent resin containing the water is too low in the packaging bag, thereby ensuring that the packaging bag has proper humidity, and avoiding the conditions of rotting fruits and vegetables with too high humidity and water loss of fruits and vegetables with too low humidity.
Description
Technical Field
The invention relates to the technical field of film composite materials, in particular to a water-absorbing and water-retaining packaging material, a preparation method and application thereof.
Background
Along with the improvement of the living standard of people, besides the demands for the price and the quantity of fruits and vegetables, the clean, safe and nutritional of the fruits and vegetables are also the concern of consumers, and because the seasonality of the fruits and vegetables is obvious, the system technology of preservation, fresh-keeping, packaging and circulation is required to ensure the throughout-year market circulation and consumption demands of the fruits and vegetables, and if proper fresh-keeping methods and fresh-keeping packages are lacking, the fresh quality of the fruits and vegetables products cannot be protected, so that the market development is influenced. After the 21 st century, although high O was developed 2 Fresh-keeping technology, ice temperature storage and transportation technology, special chemical substance application technology (animal and plant source edible packaging material, growth regulating substance and the like), radiation technology, CAP (controlled atmosphere package) technology, high-pressure technology, microwave technology and the like effectively improve the safety quality of fresh fruit and vegetable products, but the requirements of people on functional fresh-keeping packaging materials for fruits and vegetables and the packaging treatment technology matched with the functional fresh-keeping packaging materials are higher and higher.
Under the premise of having a sterilization function, the functional fresh-keeping packaging material or the fresh-keeping packaging container can absorb redundant moisture in the package, so that the situations of rotting fruits and vegetables with overhigh humidity, water loss of fruits and vegetables with overhigh humidity and the like are prevented, and various researches on water-absorbing and water-retaining materials are carried out. For example, chinese patent publication No. CN102838769a discloses a method for preparing a moisture-absorbing packaging film material, which comprises forming a mixture solution with adhesive and film-forming properties from a mixture comprising polyvinyl alcohol resin, high molecular water-absorbing resin, methylcellulose, plasticizer, stripper and water, and forming an independent moisture-absorbing film with moisture-absorbing function by coating the mixture solution, wherein the polyvinyl alcohol material has water solubility and is easily dissolved in water when the temperature is increased; the Chinese patent publication No. CN105086066A discloses a moisture-absorbing and mildew-proof film for fine dried noodles packaging, which is characterized in that firstly, a filling master batch is prepared from water-absorbing resin and a surfactant, then, low-density polyethylene is dried, the filling master batch is added according to a certain proportion, the mixture is fully mixed and uniformly stirred, the modified resin is prepared by heating, shearing, extruding and granulating through a double-screw extruder, and finally, the modified resin is formed into a film through single-screw extrusion blow molding or tape casting, so that the moisture-absorbing and packaging film is prepared, the manufacturing process is complex, and the purpose of complete water absorption and water retention balance cannot be achieved when the moisture-absorbing and mildew-proof film is applied to fruit and vegetable packaging.
Disclosure of Invention
In order to solve the packaging problem of fruit and vegetable products, the invention provides the water-absorbing and water-retaining packaging material which can ensure that the interior of a packaging bag has proper humidity, avoid the conditions of rotting fruits and vegetables with overhigh humidity and dehydrating fruits and vegetables with overhigh humidity and has simple preparation process.
The technical scheme adopted by the invention is as follows:
the water absorbing and retaining packing material includes one waterproof film as the base material and one functional layer comprising colloid A component, hardening agent B component, ethyl acetate and water absorbing resin and coated onto the surface of the base material. Wherein, the proportion among each component of the functional layer is as follows: 10-30 parts of colloid A component, 10-40 parts of hardener B component, 10-30 parts of ethyl acetate and 20-40 parts of water-absorbent resin.
The colloid A component and the hardener B component can be hardened by mixing, and the hardening and forming are not needed by depending on temperature; ethyl acetate is colorless transparent liquid, and can also absorb part of water as a solvent; the water-absorbing resin is a functional polymer material with a large amount of hydrophilic groups, has a high water-absorbing function of absorbing water which is hundreds to thousands times heavier than the water-absorbing resin, has excellent water-retaining property, is difficult to separate water even if pressurized when the water-absorbing resin swells into hydrogel after water absorption, and has high water-absorbing capacity, high water-absorbing speed, high water-retaining capacity, strong water-absorbing capacity and good water-retaining capacity.
Wherein the substrate is one or more of polyethylene film, polypropylene film, polyvinyl chloride film, polyethylene terephthalate film, ethylene-vinyl acetate copolymer film and polyolefin heat-shrinkable film.
Wherein the colloid A component is preferably epoxy resin or acrylic acid modified epoxy resin, and the hardener B component is preferably modified amine; the colloid A component and the hardener B component can also be added with catalysts and other auxiliary agents.
Wherein, the water-absorbing resin can be SAP high molecular water-absorbing resin.
The invention also provides a preparation method of the water-absorbing and water-retaining packaging material, which comprises the following steps:
s1, uniformly mixing a colloid A component, a hardener B component, ethyl acetate and water-absorbent resin by using a mixing mill to serve as a functional layer;
s2, carrying out corona treatment on the base material, wherein the corona value of the base material after corona treatment is between 36 and 40 dynes;
s3, adding a connecting agent into the spray gun, and uniformly spraying the functional layer prepared in the step S1 onto the surface of the base material subjected to corona treatment by using the spray gun;
s4, placing the substrate containing the coating in the S3 on a heating plate, drying at 80-100 ℃, and then placing the substrate into a constant temperature box for curing at 45-80 ℃ for 48-72 hours to obtain a finished product.
The prepared finished product is separated out by gel after absorbing the water vapor in the air, the gel is the water-absorbent resin containing the moisture, and the gel can slowly release the water vapor when the humidity in the packaging bag is too low, so that the moisture in the packaging bag is maintained, and the water-absorbent resin also has the function of retaining the water while absorbing the water.
The S3 spraying mode is local spraying or integral spraying, and the local spraying mode can be round, fan-shaped or other shapes; an operator can control the humidity in the packaging bag by controlling the spraying area according to different requirements of different fruits and vegetables on humidity.
The connecting agent in S3 is a silicon rubber coating which is formed by catalytic reaction and takes vinyl silicone oil with the viscosity of 10000mPa & lts "as a main body, and is used for increasing the cohesiveness between the coating and a base layer.
The invention has the technical effects and advantages that:
(1) The preparation process is simple, the moisture loss condition of fruits and vegetables in the packaging bag can be effectively delayed, when fruits and vegetables are filled in the packaging material, water vapor generated by respiration of the fruits and vegetables can be absorbed by the water-absorbing resin, and the water-absorbing resin containing the moisture can slowly release the water vapor when the humidity in the packaging bag is too low, so that the packaging bag is ensured to have certain humidity, the conditions of rotting fruits and vegetables with too high humidity, water loss of fruits and vegetables with too low humidity and the like can be avoided, and the moisturizing function is more comprehensive;
(2) An operator can control the humidity in the packaging bag by controlling the spraying area of the functional layer according to different humidity requirements of different fruits and vegetables.
Detailed Description
Example 1:
1. and (3) preparing a water-absorbing and water-retaining packaging material:
34.5 parts by weight of a colloid A component, 4 parts by weight of a hardener B component, 46 parts by weight of ethyl acetate, 15.5 parts by weight of SAP (SAP high molecular weight absorbent resin (CAW-101, 200 meshes) and a linear low-density polyethylene film as a base material are prepared, and the preparation method comprises the following steps:
s1, uniformly mixing a colloid A component, a hardener B component, ethyl acetate and water-absorbent resin by using a mixing mill to serve as a functional layer;
s2, carrying out corona treatment on the base material, wherein the corona value of the base material after corona treatment is between 36 and 40 dynes;
s3, adding a connecting agent into the spray gun, uniformly and integrally spraying the functional layer prepared in the step S1 on the surface of the base material subjected to corona treatment by using the spray gun, wherein the connecting agent is a silicon rubber coating formed by catalytic reaction and takes vinyl silicone oil with viscosity of 10000mPa & lts as a main body;
s4, placing the substrate containing the coating in the S3 on a heating plate, drying at 80 ℃, and then placing the substrate into a constant temperature box for curing at 54 ℃ for 48 hours to obtain a finished product.
The prepared functional layer has good water absorption performance, and the water absorption capacity can reach 788.45g/m 2 /h。
2. And (3) fruit and vegetable water loss test in the packaging bag:
experiment group 1: the peppers are immersed in water for 5 seconds, fished out and put into the prepared packaging material, 5 peppers are put into each bag, the bags are weighed after being sealed, the peppers are stored at 17 ℃, the weight of the peppers is respectively weighed on days 3, 5, 8 and 11, the condition of the peppers in the bags is observed, and the recorded data are shown in table 1.
Control group 1: the peppers are immersed in water for 5 seconds, fished out and put into a fresh-keeping bag of linear low density polyethylene, 5 peppers are put into each bag, weighed after sealing, the peppers are stored at 17 ℃, the weight of the peppers is respectively weighed on days 3, 5, 8 and 11, the condition of the peppers in the bags is observed, and the recorded data are shown in table 2.
TABLE 1 Pepper weight detection data for Experimental group 1
TABLE 2 Pepper weight detection data for control group 1
Example 2:
1. and (3) preparing a water-absorbing and water-retaining packaging material:
37 parts by weight of a colloid A component, 4.5 parts by weight of a hardener B component, 50 parts by weight of ethyl acetate, 8.5 parts by weight of an SAP high molecular weight water-absorbing resin (CAW-101, 200 mesh) and a linear low density polyethylene film as a base material were prepared, and the preparation procedure was the same as in example 1. The water absorption capacity of the prepared finished functional layer is 199.04g/m 2 /h。
2. And (3) fruit and vegetable water loss test in the packaging bag:
experiment group 2: the peppers are immersed in water for 5 seconds, fished out and put into the prepared packaging material, 5 peppers are put into each bag, the bags are weighed after being sealed, the peppers are stored at 17 ℃, the weight of the peppers is respectively weighed on days 3, 5, 8 and 11, the condition of the peppers in the bags is observed, and the recorded data are shown in table 3.
Control group 2: the peppers were immersed in water for 5 seconds, then fished out and put into a fresh-keeping bag of linear low density polyethylene, 5 peppers were put into each bag, weighed after sealing, the peppers were stored at 17 ℃, the peppers were weighed on days 3, 5, 8 and 11 respectively, the peppers in the bags were observed, and the recorded data are shown in table 4.
TABLE 3 Pepper weight detection data for Experimental group 2
TABLE 4 Pepper weight detection data for control group 2
Example 3:
1. and (3) preparing a water-absorbing and water-retaining packaging material:
37 parts by weight of a colloid A component, 4.5 parts by weight of a hardener B component, 50 parts by weight of ethyl acetate, 8.5 parts by weight of SAP (SAP) high-molecular water-absorbing resin (CAW-101, 200 meshes) and a biaxially oriented polypropylene film were prepared as a base material, and the preparation steps were the same as those of example 1. The water absorption capacity of the prepared finished functional layer is 187.26g/m 2 /h。
2. And (3) fruit and vegetable water loss test in the packaging bag:
experiment group 3: the peppers are immersed in water for 5 seconds, fished out and put into the prepared packaging material, 5 peppers are put into each bag, the bags are weighed after being sealed, the peppers are stored at 17 ℃, the weight of the peppers is respectively weighed on days 3, 5, 8 and 11, the condition of the peppers in the bags is observed, and the recorded data are shown in table 5.
Control group 3: the peppers were immersed in water for 5 seconds, then fished out and put into a fresh-keeping bag of linear low density polyethylene, 5 peppers were put into each bag, weighed after sealing, the peppers were stored at 17 ℃, the peppers were weighed on days 3, 5, 8 and 11 respectively, the peppers in the bags were observed, and the recorded data are shown in table 6.
TABLE 5 Pepper weight detection data for Experimental group 3
TABLE 6 Pepper weight detection data for control group 3
Example 4:
1. and (3) preparing a water-absorbing and water-retaining packaging material:
37 parts by weight of a colloid A component, 4.5 parts by weight of a hardener B component, 50 parts by weight of ethyl acetate, 8.5 parts by weight of an SAP high molecular water-absorbing resin (CAW-101, 200 meshes) and a nylon film as a base material were prepared, and the preparation procedure was the same as in example 1. The water absorption capacity of the prepared finished functional layer is 183.39g/m 2 /h。
2. And (3) fruit and vegetable water loss test in the packaging bag:
experiment group 4: the peppers are immersed in water for 5 seconds, fished out and put into the prepared packaging material, 5 peppers are put into each bag, the bags are weighed after being sealed, the peppers are stored at 17 ℃, the weight of the peppers is respectively weighed on days 3, 5, 8 and 11, the condition of the peppers in the bags is observed, and the recorded data are shown in table 7.
Control group 4: the peppers are immersed in water for 5 seconds, fished out and put into a fresh-keeping bag of linear low density polyethylene, 5 peppers are put into each bag, weighed after sealing, the peppers are stored at 17 ℃, the weight of the peppers is respectively weighed on days 3, 5, 8 and 11, the condition of the peppers in the bags is observed, and the recorded data are shown in table 8.
TABLE 7 Pepper weight detection data for Experimental group 4
TABLE 8 Pepper weight detection data for control group 4
According to the four embodiments, the water absorption and retention packaging material can effectively delay the water loss condition of the peppers in the packaging bag, and the packaging bag is provided with proper humidity, so that the situations that fruits and vegetables with too high humidity are rotted and fruits and vegetables with too low humidity are dehydrated can be avoided, and the moisturizing function is more comprehensive.
Claims (11)
1. The water-absorbing and water-retaining packaging material is characterized by comprising a base material and a functional layer, wherein the base material is a waterproof film, the functional layer consists of a colloid A component, a hardener B component, ethyl acetate and water-absorbing resin, and the functional layer is coated on the surface of the base material in a spraying mode.
2. The water absorbing and retaining packaging material according to claim 1, wherein the functional layers comprise the following components in proportions: 10-30 parts of colloid A component, 10-40 parts of hardener B component, 10-30 parts of ethyl acetate and 20-40 parts of water-absorbent resin.
3. The water absorbing and retaining packaging material according to claim 1, wherein the substrate is one or more of polyethylene film, polypropylene film, polyvinyl chloride film, polyethylene terephthalate film, ethylene-vinyl acetate copolymer film, polyolefin heat shrink film.
4. The water absorbing and retaining packaging material according to claim 1, wherein the colloid a component is an epoxy resin or an acrylic modified epoxy resin.
5. The water absorbing and retaining packaging material of claim 1, wherein the hardener B component is a modified amine.
6. A water absorbing and retaining packaging material according to claim 1, characterized in that the spraying is performed by means of local spraying or by means of whole spraying.
7. The method for preparing the water-absorbing and water-retaining packaging material as claimed in claim 1, which is characterized by comprising the following steps:
s1, uniformly mixing a colloid A component, a hardener B component, ethyl acetate and water-absorbent resin by using a mixing mill to serve as a functional layer;
s2, carrying out corona treatment on the base material, wherein the corona value of the base material after corona treatment is between 36 and 40 dynes;
s3, adding a connecting agent into the spray gun, and uniformly spraying the functional layer prepared in the step S1 onto the surface of the base material subjected to corona treatment by using the spray gun;
s4, placing the substrate containing the coating in the S3 on a heating plate, drying at 80-100 ℃, and then placing the substrate into a constant temperature box for curing at 45-80 ℃ for 48-72 hours to obtain a finished product.
8. The method for producing a water-absorbing and water-retaining packing material according to claim 7, wherein the proportions of the respective components of the functional layer are as follows: 10-30 parts of colloid A component, 10-40 parts of hardener B component, 10-30 parts of ethyl acetate and 20-40 parts of water-absorbent resin.
9. The method for producing a water absorbing and retaining packaging material according to claim 7, wherein the S3 spraying is a local spraying or a whole spraying.
10. The method for preparing water-absorbing and water-retaining packaging material according to claim 7, wherein the connecting agent in S3 is a silicon rubber coating formed by catalytic reaction with vinyl silicone oil with viscosity of 10000 mPa' S as a main body.
11. The use of the water-absorbing and water-retaining packaging material according to claim 1 in fruit and vegetable storage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310053687.4A CN116333396A (en) | 2023-02-03 | 2023-02-03 | Water-absorbing and water-retaining packaging material and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310053687.4A CN116333396A (en) | 2023-02-03 | 2023-02-03 | Water-absorbing and water-retaining packaging material and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116333396A true CN116333396A (en) | 2023-06-27 |
Family
ID=86879816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310053687.4A Pending CN116333396A (en) | 2023-02-03 | 2023-02-03 | Water-absorbing and water-retaining packaging material and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116333396A (en) |
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2023
- 2023-02-03 CN CN202310053687.4A patent/CN116333396A/en active Pending
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