CN112721365A - Slow-release antibacterial packaging material and preparation method thereof - Google Patents
Slow-release antibacterial packaging material and preparation method thereof Download PDFInfo
- Publication number
- CN112721365A CN112721365A CN202011493663.3A CN202011493663A CN112721365A CN 112721365 A CN112721365 A CN 112721365A CN 202011493663 A CN202011493663 A CN 202011493663A CN 112721365 A CN112721365 A CN 112721365A
- Authority
- CN
- China
- Prior art keywords
- slow
- release antibacterial
- layer
- packaging material
- essential oil
- 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.)
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- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 143
- 239000005022 packaging material Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 239000000341 volatile oil Substances 0.000 claims abstract description 64
- 230000004888 barrier function Effects 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 42
- 150000001875 compounds Chemical class 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 48
- 239000011347 resin Substances 0.000 claims description 33
- 229920005989 resin Polymers 0.000 claims description 33
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 26
- 238000005266 casting Methods 0.000 claims description 24
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- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 claims description 22
- 229920013716 polyethylene resin Polymers 0.000 claims description 22
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Images
Classifications
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- Chemical & Material Sciences (AREA)
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Abstract
The invention provides a slow-release antibacterial packaging material and a preparation method thereof, and relates to the technical field of packaging materials. The slow-release antibacterial packaging material comprises an outer slow-release antibacterial layer, a first barrier layer, a middle film layer, a second barrier layer and an inner slow-release antibacterial layer from outside to inside; the preparation method comprises the steps of preparing an outer slow-release antibacterial layer material, preparing an inner slow-release antibacterial layer liquid and performing tape casting to form a film. According to the slow-release antibacterial packaging material, the first blocking layer and the second blocking layer enable the packaging material to keep impact resistance, flexibility and ductility, after the packaging material is covered on the outer surfaces of fruits and vegetables of food, the outer slow-release antibacterial layer adsorbs and removes external harmful gases such as ethylene, formaldehyde and sulfides, the cyclodextrin-essential oil inclusion compound in the inner slow-release antibacterial layer slowly releases volatile essential oil molecules, the internal harmful gases are adsorbed and removed, and the fragrance of the fruits and vegetables food is kept.
Description
Technical Field
The invention relates to the technical field of packaging materials, in particular to a slow-release antibacterial packaging material and a preparation method thereof.
Background
The antibacterial package can be divided into: release type, cure type, and absorption type. The antibacterial agent in the release type antibacterial package reaches the top space of the food or the package through diffusion to inhibit the growth of microorganisms, and the release type antibacterial package has strong sterilization performance and good immediate effect, and has the advantages that the antibacterial agent can be relatively uniformly dispersed in the package system compared with the non-release type antibacterial package, so that the packaging material does not need to be directly contacted with the food, and an ideal sterilization effect can be achieved; and the antibacterial package with the slow release performance can form long-acting sterilization, compared with short-time sterilization, most of tested microorganisms are more sensitive to the slow release effect, and the excellent long-acting sterilization effect can be exerted. However, most volatile antibacterial agents have poor thermal stability, and their use in antibacterial packaging is limited.
The existing antibacterial packaging film material can not slowly release antibacterial ingredients to achieve a lasting antibacterial effect, can not have good mechanical properties, and can not be produced industrially in a large scale.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a slow-release antibacterial packaging material and a preparation method thereof.
The invention solves the technical problems through the following technical means:
the invention provides a slow-release antibacterial packaging material which comprises an outer slow-release antibacterial layer, a first barrier layer, a middle film layer, a second barrier layer and an inner slow-release antibacterial layer from outside to inside;
the inner slow-release antibacterial layer is prepared from the following raw materials in parts by weight: 70-90 parts of metallocene polyethylene resin, 12-20 parts of high-density polyethylene resin, 26-38 parts of cyclodextrin-essential oil inclusion compound emulsion, 6-12 parts of plasticizer and 3-10 parts of sodium lignosulfonate.
The slow-release antibacterial packaging material comprises an outer slow-release antibacterial layer, a first barrier layer, a middle film layer, a second barrier layer and an inner slow-release antibacterial layer from outside to inside, wherein the first barrier layer and the second barrier layer enable the packaging material to keep impact resistance, flexibility and ductility, after the packaging material is covered on the outer surfaces of fruits and vegetables of food, the outer slow-release antibacterial layer adsorbs and removes external harmful gases such as ethylene, formaldehyde and sulfides, the inner slow-release antibacterial layer takes metallocene polyethylene resin and high-density polyethylene resin as main components and is matched with a plasticizer and a dispersant sodium lignosulfonate to enable a cyclodextrin-essential oil inclusion compound to slowly release volatile essential oil molecules and adsorb and remove internal harmful gases, and the fragrance of the fruits and vegetables of the food is kept.
Further, the preparation method of the cyclodextrin-essential oil inclusion compound emulsion comprises the following steps: dissolving beta-cyclodextrin in distilled water, stirring uniformly to obtain a beta-cyclodextrin aqueous solution with the concentration of 3-6wt%, heating in a water bath at 50-60 ℃ for 8-16min, naturally cooling to 35-40 ℃, adding an ethanol essential oil mixture with the mass of 3-8% of the beta-cyclodextrin aqueous solution, cooling to room temperature, and stirring for 20-30min to obtain the cyclodextrin-essential oil inclusion compound emulsion.
The cyclodextrin-essential oil inclusion compound emulsion is characterized in that beta-cyclodextrin is dissolved in water, an ethanol-essential oil mixture is coated by utilizing a cavity structure in the molecule of the beta-cyclodextrin, the ethanol has good solubility on essential oil, the compatibility of the beta-cyclodextrin and the essential oil is improved, the volatility of the essential oil is reduced, the cyclodextrin-essential oil inclusion compound emulsion is applied to an inner slow-release antibacterial layer, no harm is caused to food and fruits, and the slowly-released essential oil molecules achieve the long-acting antibacterial and fragrant effects.
Further, the ethanol and essential oil mixture is formed by uniformly mixing ethanol and essential oil according to the mass ratio of 3-5: 1.
Further, the essential oil is one or more of lemon essential oil, mint essential oil, chamomile essential oil, lime essential oil and rose essential oil.
Further, the outer slow-release antibacterial layer is prepared from the following raw materials in parts by weight: 65-80 parts of metallocene polyethylene resin, 15-26 parts of low-density polyethylene resin, 6-15 parts of diatomite and 0.6-3 parts of nano zinc oxide.
In the outer slow-release antibacterial layer, metallocene polyethylene resin and low-density polyethylene resin are used as main components, and the loose porous structure of the diatomite adsorbs the nano zinc oxide to play the slow-release antibacterial role of the nano zinc oxide; ethylene is decomposed into water and carbon dioxide through the reaction of the nano zinc oxide and oxygen, and the ethylene and the carbon dioxide have a slow release effect, so that the ethylene and the oxygen which cause putrefactive acidification can be reduced, and a fresh-keeping effect is achieved; the ethylene gas is continuously treated through the circulation of adsorption, decomposition and elimination, and the rotten mould and bacteria are continuously eliminated, so that the long-acting fresh-keeping effect is achieved.
Further, the plasticizer is one or more of glycerol, sorbitol, xylitol, mannitol, glucose, fructose and sucrose.
Further, the first barrier layer and the second barrier layer are prepared from linear low-density polyethylene resin and high-density polyethylene resin according to the mass ratio of 2-3: 1.
The invention also provides a preparation method of the slow-release antibacterial packaging material, which comprises the following steps:
s1, preparing an outer slow-release antibacterial layer material: uniformly mixing metallocene polyethylene resin, low-density polyethylene resin, diatomite and nano zinc oxide, and introducing into a double-screw extruder for mixing and granulating to obtain an outer slow-release antibacterial layer material for later use;
s2, preparing an inner slow-release antibacterial layer solution: mixing metallocene polyethylene resin, high density polyethylene resin and cyclodextrin-essential oil inclusion compound emulsion, heating to 60-70 ℃, stirring for 1-2 hours, adding plasticizer and sodium lignosulfonate, stirring for 2-3 hours at room temperature to obtain inner slow-release antibacterial layer liquid for later use;
s3, casting film forming: heating and melting the outer slow-release antibacterial layer material, then feeding the outer slow-release antibacterial layer material, the middle film layer material, the second barrier layer material and the inner slow-release antibacterial layer liquid into a casting machine for casting to form a film, and drying the film for 24 to 48 hours at 25 to 30 ℃ to obtain the slow-release antibacterial packaging material consisting of the outer slow-release antibacterial layer, the first barrier layer, the middle film layer, the second barrier layer and the inner slow-release antibacterial layer from outside to inside.
The preparation method of the slow-release antibacterial packaging material adopts the method that the outer slow-release antibacterial layer material is heated and melted, and then the outer slow-release antibacterial layer material, the first barrier layer material, the middle film layer material, the second barrier layer material and the inner slow-release antibacterial layer liquid are fed into a casting machine for casting to form the film, so that the processing is simple and efficient, the performance of the packaging material is stable, and the preparation method is suitable for large-scale industrial production.
Further, the rotating speed of the double-screw extruder is 80-120rpm, and the processing temperature of the casting machine is 150-180 ℃.
Furthermore, the thickness of the slow-release antibacterial packaging material is 0.2-0.3 mm.
The invention has the beneficial effects that:
(1) according to the slow-release antibacterial packaging material, the first blocking layer and the second blocking layer enable the packaging material to keep impact resistance, flexibility and ductility, after the packaging material is covered on the outer surfaces of fruits and vegetables of food, the outer slow-release antibacterial layer adsorbs and removes external harmful gases such as ethylene, formaldehyde and sulfides, the cyclodextrin-essential oil inclusion compound in the inner slow-release antibacterial layer slowly releases volatile essential oil molecules, the internal harmful gases are adsorbed and removed, and the fragrance of the fruits and vegetables food is kept.
(2) The preparation method of the slow-release antibacterial packaging material adopts the method that the outer slow-release antibacterial layer material is heated and melted, and then the outer slow-release antibacterial layer material, the first barrier layer material, the middle film layer material, the second barrier layer material and the inner slow-release antibacterial layer liquid are fed into a casting machine for casting to form the film, so that the processing is simple and efficient, the performance of the packaging material is stable, and the preparation method is suitable for large-scale industrial production.
Drawings
FIG. 1 is a hierarchical structure diagram of a slow release antibacterial packaging material of the present invention;
FIG. 2 is a flow chart of the preparation method of the slow-release antibacterial packaging material of the present invention.
In the figure: 1. an outer slow-release antibacterial layer; 2. a first barrier layer; 3. an intermediate film layer; 4. a second barrier layer; 5. an inner slow-release antibacterial layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Example 1
As shown in fig. 1-2, the slow-release antibacterial packaging material of the present embodiment includes, from outside to inside, an outer slow-release antibacterial layer 1, a first barrier layer 2, a middle film layer 3, a second barrier layer 4, and an inner slow-release antibacterial layer 5. The inner slow-release antibacterial layer 5 is prepared from the following raw materials in parts by weight: 85 parts of metallocene polyethylene resin, 18 parts of high-density polyethylene resin, 35 parts of cyclodextrin-essential oil inclusion compound emulsion, 11 parts of plasticizer sorbitol and 8 parts of sodium lignosulfonate. The first barrier layer 2 and the second barrier layer 4 are prepared from linear low-density polyethylene resin and high-density polyethylene resin according to a mass ratio of 2.5: 1.
The preparation method of the cyclodextrin-essential oil inclusion compound emulsion comprises the following steps: dissolving beta-cyclodextrin in distilled water, stirring uniformly to obtain a beta-cyclodextrin aqueous solution with the concentration of 5.2wt%, heating in a water bath at 55 ℃ for 13min, naturally cooling to 38 ℃, adding an ethanol essential oil mixture with the mass of 5% of the beta-cyclodextrin aqueous solution, cooling to room temperature, and stirring for 25min to obtain the cyclodextrin-essential oil inclusion compound emulsion. Wherein the ethanol essential oil mixture is formed by uniformly mixing ethanol and rose essential oil according to the mass ratio of 4.2: 1.
The outer slow-release antibacterial layer 1 is prepared from the following raw materials in parts by weight: 75 parts of metallocene polyethylene resin, 23 parts of low-density polyethylene resin, 12 parts of diatomite and 2.2 parts of nano zinc oxide.
The preparation method of the slow-release antibacterial packaging material comprises the following steps:
s1, preparing an outer slow-release antibacterial layer material: uniformly mixing metallocene polyethylene resin, low-density polyethylene resin, diatomite and nano zinc oxide, and then introducing the mixture into a double-screw extruder for mixing and granulation to obtain an outer slow-release antibacterial layer material for later use, wherein the rotating speed of the double-screw extruder is 100 rpm;
s2, preparing an inner slow-release antibacterial layer solution: mixing metallocene polyethylene resin, high density polyethylene resin and cyclodextrin-essential oil inclusion compound emulsion, heating to 66 ℃, stirring for 1.8 hours, adding sorbitol serving as a plasticizer and sodium lignosulfonate, and stirring for 2.6 hours at room temperature to obtain inner slow-release antibacterial layer liquid for later use;
s3, casting film forming: heating and melting the outer slow-release antibacterial layer material, then feeding the outer slow-release antibacterial layer material, the middle film layer material, the second barrier layer material and the inner slow-release antibacterial layer liquid into a casting machine for casting to form a film, and drying at 28 ℃ for 45 hours to obtain the slow-release antibacterial packaging material consisting of the outer slow-release antibacterial layer, the first barrier layer, the middle film layer, the second barrier layer and the inner slow-release antibacterial layer from outside to inside. The processing temperature of the casting machine is 170 ℃, and the thickness of the slow-release antibacterial packaging material is 0.26 mm.
Example 2
As shown in fig. 1-2, the slow-release antibacterial packaging material of the present embodiment includes, from outside to inside, an outer slow-release antibacterial layer 1, a first barrier layer 2, a middle film layer 3, a second barrier layer 4, and an inner slow-release antibacterial layer 5. The inner slow-release antibacterial layer 5 is prepared from the following raw materials in parts by weight: 83 parts of metallocene polyethylene resin, 17 parts of high-density polyethylene resin, 34 parts of cyclodextrin-essential oil inclusion compound emulsion, 10 parts of plasticizer glucose and 9 parts of sodium lignosulfonate. The first barrier layer 2 and the second barrier layer 4 are prepared from linear low-density polyethylene resin and high-density polyethylene resin according to a mass ratio of 2.5: 1.
The preparation method of the cyclodextrin-essential oil inclusion compound emulsion comprises the following steps: dissolving beta-cyclodextrin in distilled water, stirring uniformly to obtain a beta-cyclodextrin aqueous solution with the concentration of 5.2wt%, heating in a water bath at 60 ℃ for 15min, naturally cooling to 40 ℃, adding an ethanol essential oil mixture with the mass of 7% of the beta-cyclodextrin aqueous solution, cooling to room temperature, and stirring for 30min to obtain the cyclodextrin-essential oil inclusion compound emulsion. Wherein the ethanol essential oil mixture is formed by uniformly mixing ethanol and lemon essential oil according to the mass ratio of 4.6: 1.
The outer slow-release antibacterial layer 1 is prepared from the following raw materials in parts by weight: 72 parts of metallocene polyethylene resin, 24 parts of low-density polyethylene resin, 13 parts of diatomite and 2.5 parts of nano zinc oxide.
The preparation method of the slow-release antibacterial packaging material comprises the following steps:
s1, preparing an outer slow-release antibacterial layer material: uniformly mixing metallocene polyethylene resin, low-density polyethylene resin, diatomite and nano zinc oxide, and then introducing the mixture into a double-screw extruder for mixing and granulation to obtain an outer slow-release antibacterial layer material for later use, wherein the rotating speed of the double-screw extruder is 110 rpm;
s2, preparing an inner slow-release antibacterial layer solution: mixing metallocene polyethylene resin, high density polyethylene resin and cyclodextrin-essential oil inclusion compound emulsion, heating to 68 ℃, stirring for 1.6 hours, adding plasticizer glucose and sodium lignosulfonate, and stirring for 2.8 hours at room temperature to obtain inner slow-release antibacterial layer liquid for later use;
s3, casting film forming: heating and melting the outer slow-release antibacterial layer material, then feeding the outer slow-release antibacterial layer material, the middle film layer material, the second barrier layer material and the inner slow-release antibacterial layer liquid into a casting machine for casting to form a film, and drying at 30 ℃ for 36 hours to obtain the slow-release antibacterial packaging material consisting of the outer slow-release antibacterial layer, the first barrier layer, the middle film layer, the second barrier layer and the inner slow-release antibacterial layer from outside to inside. The processing temperature of the casting machine is 168 ℃, and the thickness of the slow-release antibacterial packaging material is 0.25 mm.
Example 3
As shown in fig. 1-2, the slow-release antibacterial packaging material of the present embodiment includes, from outside to inside, an outer slow-release antibacterial layer 1, a first barrier layer 2, a middle film layer 3, a second barrier layer 4, and an inner slow-release antibacterial layer 5. The inner slow-release antibacterial layer 5 is prepared from the following raw materials in parts by weight: 86 parts of metallocene polyethylene resin, 18 parts of high-density polyethylene resin, 35 parts of cyclodextrin-essential oil inclusion compound emulsion, 12 parts of plasticizer glycerol and 9 parts of sodium lignosulfonate. The first barrier layer 2 and the second barrier layer 4 are prepared from linear low-density polyethylene resin and high-density polyethylene resin according to a mass ratio of 2.8: 1.
The preparation method of the cyclodextrin-essential oil inclusion compound emulsion comprises the following steps: dissolving beta-cyclodextrin in distilled water, stirring uniformly to obtain a beta-cyclodextrin aqueous solution with the concentration of 6wt%, heating in a water bath at 60 ℃ for 12min, naturally cooling to 40 ℃, adding an ethanol essential oil mixture with the mass of 7% of the beta-cyclodextrin aqueous solution, cooling to room temperature, and stirring for 28min to obtain the cyclodextrin-essential oil inclusion compound emulsion. Wherein the ethanol essential oil mixture is formed by uniformly mixing ethanol and chamomile essential oil according to the mass ratio of 4.8: 1.
The outer slow-release antibacterial layer 1 is prepared from the following raw materials in parts by weight: 75 parts of metallocene polyethylene resin, 25 parts of low-density polyethylene resin, 10 parts of diatomite and 1.8 parts of nano zinc oxide.
The preparation method of the slow-release antibacterial packaging material comprises the following steps:
s1, preparing an outer slow-release antibacterial layer material: uniformly mixing metallocene polyethylene resin, low-density polyethylene resin, diatomite and nano zinc oxide, and then introducing the mixture into a double-screw extruder for mixing and granulation to obtain an outer slow-release antibacterial layer material for later use, wherein the rotating speed of the double-screw extruder is 100 rpm;
s2, preparing an inner slow-release antibacterial layer solution: mixing metallocene polyethylene resin, high density polyethylene resin and cyclodextrin-essential oil inclusion compound emulsion, heating to 70 ℃, stirring for 1.2 hours, adding plasticizer and sodium lignosulfonate, and stirring for 3 hours at room temperature to obtain inner slow-release antibacterial layer liquid for later use;
s3, casting film forming: and heating and melting the outer slow-release antibacterial layer material, then feeding the outer slow-release antibacterial layer material, the middle film layer material, the second barrier layer material and the inner slow-release antibacterial layer liquid into a casting machine for casting to form a film, and drying at 28 ℃ for 42 hours to obtain the slow-release antibacterial packaging material consisting of the outer slow-release antibacterial layer, the first barrier layer, the middle film layer, the second barrier layer and the inner slow-release antibacterial layer from outside to inside. The processing temperature of the casting machine is 172 ℃, and the thickness of the slow-release antibacterial packaging material is 0.28 mm.
Comparative example 1
The comparative example differs from example 1 in that the dextrin-essential oil inclusion complex emulsion in the inner sustained-release antibacterial layer is replaced by essential oil.
Comparative example 2
The comparative example is different from example 1 in that diatomaceous earth is not added to the outer sustained-release antibacterial layer.
Comparative example 3
The comparative example is different from example 1 in that the raw materials of the first barrier layer and the second barrier layer are linear low density polyethylene resins.
Performance testing
The slow-release antibacterial packaging materials prepared in examples 1-3 and comparative examples 1-3 are subjected to physical and mechanical property tests according to the national standard GB 10457-2009 plastic self-adhesive preservative film for food; the antibacterial performance test is to pour original bacteria liquid of escherichia coli and bacillus subtilis and 5mL culture solution into a 10mL centrifuge tube, shake-bed culture is carried out at 37 ℃ for 12h, the culture solution is yeast extract 0.5wt%, peptone 1wt%, sodium chloride NaCl 1wt% and deionized water 97.5wt%, the packaging material is cut into a square of 1cm x 1cm and then placed into the centrifuge tube, the sterilization rate after 12 hours, 24 hours and 36 hours is statistically calculated, and the specific test results are shown in the following table:
as can be seen from the table above, the mechanical properties of tensile strength and fracture nominal strain of the slow-release antibacterial packaging material prepared in the embodiment of the invention are superior to those of the comparative example, the sterilization rate of 36h can reach 98.7% at most, the sterilization rates of 12h, 24h and 36h are gradually improved, the dextrin-essential oil inclusion compound emulsion in the comparative example 1 is replaced by essential oil, and the slow-release antibacterial effect cannot be achieved due to the fact that diatomite is not added in the comparative example 2, and the antibacterial durability is poor.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The slow-release antibacterial packaging material is characterized by comprising an outer slow-release antibacterial layer (1), a first barrier layer (2), a middle film layer (3), a second barrier layer (4) and an inner slow-release antibacterial layer (5) from outside to inside;
the inner slow-release antibacterial layer (5) is prepared from the following raw materials in parts by weight: 70-90 parts of metallocene polyethylene resin, 12-20 parts of high-density polyethylene resin, 26-38 parts of cyclodextrin-essential oil inclusion compound emulsion, 6-12 parts of plasticizer and 3-10 parts of sodium lignosulfonate.
2. The slow release antimicrobial packaging material of claim 1 wherein the cyclodextrin-essential oil inclusion complex emulsion is prepared by the following method: dissolving beta-cyclodextrin in distilled water, stirring uniformly to obtain a beta-cyclodextrin aqueous solution with the concentration of 3-6wt%, heating in a water bath at 50-60 ℃ for 8-16min, naturally cooling to 35-40 ℃, adding an ethanol essential oil mixture with the mass of 3-8% of the beta-cyclodextrin aqueous solution, cooling to room temperature, and stirring for 20-30min to obtain the cyclodextrin-essential oil inclusion compound emulsion.
3. The slow-release antibacterial packaging material of claim 2, wherein the ethanol essential oil mixture is formed by uniformly mixing ethanol and essential oil according to a mass ratio of 3-5: 1.
4. The slow release antimicrobial packaging material of claim 3, wherein the essential oil is a combination of one or more of lemon essential oil, peppermint essential oil, chamomile essential oil, lime essential oil, rose essential oil.
5. The slow-release antibacterial packaging material according to claim 1, characterized in that the outer slow-release antibacterial layer (1) is prepared from the following raw materials in parts by weight: 65-80 parts of metallocene polyethylene resin, 15-26 parts of low-density polyethylene resin, 6-15 parts of diatomite and 0.6-3 parts of nano zinc oxide.
6. The slow release antimicrobial packaging material of claim 1, wherein the plasticizer is one or a combination of glycerin, sorbitol, xylitol, mannitol, glucose, fructose, sucrose.
7. The slow-release antibacterial packaging material according to claim 1, characterized in that the first barrier layer (2) and the second barrier layer (4) are prepared from linear low-density polyethylene resin and high-density polyethylene resin according to a mass ratio of 2-3: 1.
8. The method for preparing a slow release antibacterial packaging material according to any one of claims 1 to 7, characterized by comprising the steps of:
s1, preparing an outer slow-release antibacterial layer material: uniformly mixing metallocene polyethylene resin, low-density polyethylene resin, diatomite and nano zinc oxide, and introducing into a double-screw extruder for mixing and granulating to obtain an outer slow-release antibacterial layer material for later use;
s2, preparing an inner slow-release antibacterial layer solution: mixing metallocene polyethylene resin, high density polyethylene resin and cyclodextrin-essential oil inclusion compound emulsion, heating to 60-70 ℃, stirring for 1-2 hours, adding plasticizer and sodium lignosulfonate, stirring for 2-3 hours at room temperature to obtain inner slow-release antibacterial layer liquid for later use;
s3, casting film forming: heating and melting the outer slow-release antibacterial layer material, then feeding the outer slow-release antibacterial layer material, the middle film layer material, the second barrier layer material and the inner slow-release antibacterial layer liquid into a casting machine for casting to form a film, and drying the film for 24 to 48 hours at 25 to 30 ℃ to obtain the slow-release antibacterial packaging material consisting of the outer slow-release antibacterial layer, the first barrier layer, the middle film layer, the second barrier layer and the inner slow-release antibacterial layer from outside to inside.
9. The method for preparing the slow-release antibacterial packaging material as claimed in claim 8, wherein the rotation speed of the twin-screw extruder is 80-120rpm, and the processing temperature of the casting machine is 150-180 ℃.
10. The method for preparing a slow-release antibacterial packaging material according to claim 8, wherein the thickness of the slow-release antibacterial packaging material is 0.2-0.3 mm.
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| CN114905823A (en) * | 2022-06-02 | 2022-08-16 | 江林（贵州）高科发展股份有限公司 | Modified atmosphere composite packaging film for fresh bamboo fungus preservation and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114905823A (en) * | 2022-06-02 | 2022-08-16 | 江林（贵州）高科发展股份有限公司 | Modified atmosphere composite packaging film for fresh bamboo fungus preservation and preparation method thereof |
| CN114905823B (en) * | 2022-06-02 | 2023-08-08 | 江林（贵州）高科发展股份有限公司 | Spontaneous air-conditioning composite packaging film for fresh bamboo fungus preservation and preparation method thereof |
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