Bacteria blocking type shiitake mushroom packaging material and production process thereof
By introducing modified tourmaline and illite into the packaging material of shiitake mushrooms, a negative ion and stable antibacterial system is formed, which solves the problems of insufficient air permeability and antibacterial properties of shiitake mushroom packaging bags and achieves high efficiency in antibacterial performance and mechanical property improvement.
Patent Information
- Application Number
- CN202411434692.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-01-14
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing shiitake mushroom packaging bags have poor air permeability, making it impossible to effectively dissipate endogenous formaldehyde, and they also lack antibacterial and antimicrobial properties, leading to bacterial growth and affecting the quality of shiitake mushrooms.
A type of antibacterial packaging material for shiitake mushrooms is used, comprising a meltblown fabric layer and an antibacterial inner layer. The antibacterial inner layer is composed of EVA, low-density polyethylene, modified tourmaline, modified illite, modified polyethylene glycol, etc. Through modification treatment, negative ions and a stable antibacterial system are formed, improving air permeability and antibacterial performance.
It achieves good air permeability and strong antibacterial properties in shiitake mushroom packaging materials, which can kill and block bacteria, improve the mechanical properties of packaging materials, and significantly improve the preservation quality of shiitake mushrooms.
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Figure CN119305273A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of stamping, and in particular relates to a bacteria-blocking mushroom packaging material and a production process thereof. Background Art
[0002] Shiitake mushrooms are delicious, have high nutritional value, and contain a variety of biologically active substances such as polysaccharides, antioxidants, dietary fiber, ergosterol, VB1, VB2, folic acid, niacin and minerals. They are a very precious edible fungus that can be used as both medicine and food, and have a large market both at home and abroad.
[0003] At present, shiitake mushrooms are mostly packaged in packaging bags. The existing packaging bags have poor air permeability, which is not conducive to the emission of endogenous formaldehyde in shiitake mushrooms, and do not have antibacterial and antibacterial properties. During the subsequent storage process, bacteria may enter, causing bacterial growth and affecting the quality of shiitake mushrooms. Summary of the invention
[0004] The present invention provides a bacteria-blocking mushroom packaging material and a production process thereof, aiming to solve the above-mentioned problems.
[0005] The present invention is implemented as follows: a bacteriostatic mushroom packaging material comprises a meltblown cloth layer and an antibacterial inner layer, the thickness ratio of the two is 2-4:1, and the antibacterial inner layer comprises the following raw materials in parts by weight: 80-100 parts of EVA, 30-40 parts of low-density polyethylene, 25-40 parts of linear low-density polyethylene, 6-10 parts of modified tourmaline, 5-10 parts of modified illite, 10-15 parts of modified polyethylene glycol, 1-5 parts of zinc stearate, and 2-4 parts of sodium lignin sulfonate.
[0006] Preferably, the antibacterial inner layer comprises the following raw materials in parts by weight: 85-95 parts of EVA, 33-37 parts of low-density polyethylene, 30-35 parts of linear low-density polyethylene, 7-9 parts of modified tourmaline, 6-9 parts of modified illite, 11-14 parts of modified polyethylene glycol, 2-4 parts of zinc stearate, and 2.5-3.5 parts of sodium lignin sulfonate.
[0007] Preferably, the antibacterial inner layer comprises the following raw materials in parts by weight: 90 parts of EVA, 35 parts of low-density polyethylene, 32.5 parts of linear low-density polyethylene, 8 parts of modified tourmaline, 7.5 parts of modified illite, 12.5 parts of modified polyethylene glycol, 3 parts of zinc stearate, and 3 parts of sodium lignin sulfonate.
[0008] Preferably, the preparation method of the modified tourmaline is as follows: Weigh 10-15 parts by weight of tourmaline, clean the surface, dry and then grind it preliminarily; Place the mixture in a muffle furnace and heat it to 600-700°C, calcine it at a constant temperature for 1-2 hours, and grind it to a particle size of 300-400 meshes after cooling to obtain tourmaline powder; Add 10-20 times the weight of 25-35vt% hydrochloric acid solution to the tourmaline powder, soak for 3-5 hours, filter and wash with deionized water 2-3 times; The cleaned tourmaline powder is ground to a particle size of 100-200 mesh, mixed with 1-2 parts by weight of tea polyphenols, 0.5-1 parts by weight of hydroxypropyl methylcellulose, and 20-30 parts by weight of deionized water, stirred at a speed of 400-500 r / min for 50-60 minutes, filtered, and dried at 80-90° C. to obtain modified tourmaline.
[0009] Tourmaline can produce negative ions, which can kill and block bacteria. By roasting tourmaline, water in different states in the tourmaline crystal structure is removed, making the internal structure loose and porous, increasing the specific surface area, and then the surface of the tourmaline is modified by hydrochloric acid corrosion, so that a stable porous structure is formed on the surface of the tourmaline particles. It is further modified by tea polyphenols and hydroxypropyl methylcellulose, which can improve the antibacterial properties of tourmaline on the one hand, and improve the dispersibility of tourmaline and the interface compatibility with other components on the other hand, so that the modified tourmaline is evenly dispersed to form an antibacterial layer, and combined with other components to form a stable system, thereby improving the mechanical properties of the packaging material.
[0010] Preferably, the cleaned tourmaline powder is subjected to fermentation treatment and then ground, and the fermentation treatment process is: the cleaned tourmaline powder is spread flat with a thickness of 0.1-0.3 cm, irradiated with ultraviolet rays for 10-20 minutes, then loaded into a culture vessel and injected with bacterial cellulose fermentation liquid with Acetobacter xylinum as the strain, wrapped, and cultured at 25-28°C for 3-5 days, and the culture product is rinsed with deionized water, the residual culture liquid is removed, and it is filtered after soaking in deionized water for 1-2 days. The fermentation treatment allows the bacterial cellulose to grow into the pores of the tourmaline, forming an interlaced interpenetrating network with it, thereby improving the antibacterial ability and biocompatibility of the tourmaline, and at the same time having a large adsorption space, fully adsorbing and combining the modified substance, and improving the modification efficiency.
[0011] Preferably, the preparation method of the bacterial cellulose fermentation liquid with Acetobacter xylinum as the strain is as follows: inoculating Acetobacter xylinum strains into the culture liquid, stirring at a stirring speed of 120-180r / min for 3-5min, and then culturing at 25-28°C for 36-48h to obtain seed liquid; inoculating the seed liquid with a volume of 10-15% of the culture liquid into the culture liquid, mixing and setting aside to obtain bacterial cellulose fermentation liquid.
[0012] Preferably, the preparation method of the modified illite is as follows: Take 10-14 parts by weight of illite, grind it to a particle size of 100-200 mesh, then add 100-150 parts by weight of 5-10% HCl solution, stir at 400-500r / min for 1-2h in a constant temperature water bath of 50-60°C, let it stand, cool to room temperature, and then filter to obtain illite powder; The illite powder is mixed with 150-200 parts by weight of an isopropanol aqueous solution with a concentration of 40-50% and 1-2 parts by weight of hexadecyltrimethylammonium bromide, reacted in a microwave oven at 70-80° C. for 60-80 minutes, allowed to stand to room temperature, centrifuged at 4500-5000 r / min for 5-8 minutes, and the fixed particles after centrifugation are dried at a constant temperature of 80-90° C. to obtain a preliminary modified illite powder; The preliminarily modified illite powder is mixed with 3-5 parts by weight of chitosan and 50-60 parts by weight of deionized water, stirred at room temperature for 50-60 minutes at 2000-3000 r / min, then filtered, washed with deionized water 2-3 times, and dried at a constant temperature of 80-90° C. to obtain the modified illite powder.
[0013] Illite has physical antibacterial function and can kill bacteria. It is first acid-washed to form a stable porous structure on the surface of the illite particles, and then modified by a cationic modifier, hexadecyltrimethylammonium bromide, so that organic groups cover the surface of the illite or insert between its layers, thereby changing its surface energy and increasing the interlayer spacing, changing from hydrophilic to lipophilic, and forming a uniform nano-level dispersion to form a stable antibacterial system. At the same time, the mechanical properties of the packaging material are improved. Finally, chitosan and illite form an intercalation structure, the specific surface area is further expanded, and chitosan can further improve the antibacterial effect.
[0014] Preferably, the preparation method of the modified polyethylene glycol is as follows: Take 15-20 parts by weight of polyethylene glycol and dissolve it in 120-150 parts by weight of deionized water; Then add 2-4 parts by weight of 3-amino-1,2-propylene glycol and stir at 60-80°C for 40-60 minutes; Then, 1-2 parts by weight of cardanol is added, and stirring is continued for 30-50 minutes to obtain modified polyethylene glycol.
[0015] First, the activity of polyethylene glycol is improved by grafting amino groups on the ends of polyethylene glycol, and then cardanol is added to further improve the antibacterial properties of polyethylene glycol. At the same time, the modified polyethylene glycol forms a three-dimensional network system with other components to improve the mechanical properties of the packaging material.
[0016] Preferably, the antibacterial inner layer further comprises 3-7 parts of modified nano titanium dioxide, and the preparation method of the modified nano titanium dioxide is as follows: Take 10-14 parts by weight of nano titanium dioxide and put it into 70-80 parts by weight of anhydrous ethanol with a pH value of 5-6, containing 10-15% triethanolamine and 5-10% sodium dodecyl sulfate for 2-3 minutes; Add 3-5 parts of resveratrol, place in a 70-80°C water bath and stir for 30-40 minutes, then irradiate with ultraviolet light for 3-5 minutes while stirring, then filter, wash with deionized water 2-3 times, dry at 70-80°C, and grind to obtain modified nano titanium dioxide.
[0017] First, the nano-peptide titanium dioxide is modified by triethanolamine and sodium dodecyl sulfate to improve the dispersibility and compatibility of titanium dioxide. Then, by adding resveratrol and ultraviolet irradiation, the photocatalytic properties of titanium dioxide are enhanced, thereby improving the formaldehyde removal and antibacterial properties.
[0018] The present invention also provides a production process of the above-mentioned bacteria-blocking mushroom packaging material, comprising the following steps: Prepare meltblown cloth; Prepare various raw materials for the antibacterial inner layer; The raw materials of the antibacterial inner layer are mixed, and then the antibacterial inner layer is made by extrusion, casting, stretching and heat setting; specifically, the temperature of the feeding section and the homogenizing section in the extrusion step is 180-210° C., the die head temperature is 200-220° C., the cooling roller temperature in the casting step is 20-40° C., the stretching ratio of the film in the stretching step is 1.2-2, and the heat setting temperature is 65-70° C.; The antibacterial inner layer and the meltblown cloth are hot-pressed and then naturally cooled to obtain the antibacterial mushroom packaging material.
[0019] Compared with the prior art, the embodiments of the present application have the following beneficial effects: The antibacterial mushroom packaging material provided by the present invention comprises a meltblown cloth layer and an antibacterial inner layer, has good air permeability and antibacterial properties, and by adding modified tourmaline to the raw material of the antibacterial inner layer, negative ions can be generated, which can kill and block bacteria, and by adding modified illite, it is evenly dispersed at the nanometer level to form a stable antibacterial system, and by adding modified polyethylene glycol, other components form a three-dimensional network system, thereby improving the antibacterial properties and the mechanical properties of the packaging material. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 The present invention provides a production process flow chart of a bacteria-blocking shiitake mushroom packaging material. DETAILED DESCRIPTION
[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.
[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0023] Example 1 The embodiment of the present invention provides a bacterium-blocking mushroom packaging material, such as Figure 1 As shown, it includes a meltblown cloth layer and an antibacterial inner layer, and the thickness ratio of the two is 2:1. The antibacterial inner layer includes the following raw materials in parts by weight: 80 parts of EVA, 30 parts of low-density polyethylene, 25 parts of linear low-density polyethylene, 6 parts of modified tourmaline, 5 parts of modified illite, 10 parts of modified polyethylene glycol, 1 part of zinc stearate, and 2 parts of sodium lignin sulfonate. The production process of the packaging material includes the following steps: Prepare meltblown cloth; Prepare various raw materials for the antibacterial inner layer; The raw materials of the antibacterial inner layer are mixed, and then the antibacterial inner layer is made by extrusion, casting, stretching and heat setting; specifically, the temperature of the feeding section and the homogenizing section in the extrusion step is 180° C., the die head temperature is 200° C., the cooling roller temperature in the casting step is 20° C., the stretching ratio of the film in the stretching step is 1.2, and the heat setting temperature is 65° C.; The antibacterial inner layer and the meltblown cloth are hot-pressed and then naturally cooled to obtain the antibacterial mushroom packaging material.
[0024] Wherein, the preparation method of the modified tourmaline is as follows: Weigh 10 parts by weight of tourmaline, clean the surface, dry and then preliminarily crush; Place the mixture in a muffle furnace and heat it to 600°C, calcine it at a constant temperature for 1 hour, and grind it to a particle size of 300 meshes after cooling to obtain tourmaline powder; Add 10 times the weight of 25vt% hydrochloric acid solution to the tourmaline powder, soak for 3 hours, filter and wash twice with deionized water; The cleaned tourmaline powder was ground to a particle size of 100 mesh, mixed with 1 part by weight of tea polyphenols, 0.5 parts by weight of hydroxypropyl methylcellulose, and 20 parts by weight of deionized water, stirred at a speed of 400 r / min for 50 minutes, filtered, and dried at 80° C. to obtain modified tourmaline.
[0025] Furthermore, the preparation method of the modified illite is as follows: Take 10 parts by weight of illite, grind it to a particle size of 100 mesh, then add 100 parts by weight of 5% HCl solution, stir at 400 r / min for 1 hour in a 50°C constant temperature water bath, let it stand, cool to room temperature, and then filter to obtain illite powder; Illite powder was mixed with 150 parts by weight of an isopropanol aqueous solution with a concentration of 40% and 1 part by weight of hexadecyltrimethylammonium bromide, reacted at 70° C. in a microwave oven for 60 minutes, allowed to stand to room temperature, centrifuged at 4500 r / min for 5 minutes, and the fixed particles after centrifugation were dried at a constant temperature of 80° C. to obtain a preliminary modified illite powder; The preliminarily modified illite powder was mixed with 3 parts by weight of chitosan and 50 parts by weight of deionized water, stirred at room temperature for 50 minutes at 2000 r / min, then filtered, washed twice with deionized water, and dried at a constant temperature of 80° C. to obtain the modified illite powder.
[0026] In this embodiment, the preparation method of the modified polyethylene glycol is as follows: Take 15 parts by weight of polyethylene glycol and dissolve it in 120 parts by weight of deionized water; Then, 2 parts by weight of 3-amino-1,2-propanediol were added and stirred at 60° C. for 40 min; Then, 1 part by weight of cardanol was added, and stirring was continued for 30 minutes to obtain modified polyethylene glycol.
[0027] Example 2 The embodiment of the present invention provides a bacterium-blocking mushroom packaging material, such as Figure 1 As shown, it includes a meltblown cloth layer and an antibacterial inner layer, and the thickness ratio of the two is 2:1. The antibacterial inner layer includes the following raw materials in parts by weight: EVA 85 parts, low-density polyethylene 33 parts, linear low-density polyethylene 30 parts, modified tourmaline 7 parts, modified illite 6 parts, modified polyethylene glycol 11 parts, zinc stearate 2 parts, sodium lignin sulfonate 2.5 parts. The production process of the packaging material includes the following steps: Prepare meltblown cloth; Prepare various raw materials for the antibacterial inner layer; The raw materials of the antibacterial inner layer are mixed, and then the antibacterial inner layer is made by extrusion, casting, stretching and heat setting; specifically, the temperature of the feeding section and the homogenizing section in the extrusion step is 180° C., the die head temperature is 200° C., the cooling roller temperature in the casting step is 20° C., the stretching ratio of the film in the stretching step is 1.2, and the heat setting temperature is 65° C.; The antibacterial inner layer and the meltblown cloth are hot-pressed and then naturally cooled to obtain the antibacterial mushroom packaging material.
[0028] Wherein, the preparation method of the modified tourmaline is as follows: Weigh 10 parts by weight of tourmaline, clean the surface, dry and then preliminarily crush; Place the mixture in a muffle furnace and heat it to 600°C, calcine it at a constant temperature for 1 hour, and grind it to a particle size of 300 meshes after cooling to obtain tourmaline powder; Add 10 times the weight of 25vt% hydrochloric acid solution to the tourmaline powder, soak for 3 hours, filter and wash twice with deionized water; The cleaned tourmaline powder was ground to a particle size of 100 mesh, mixed with 1 part by weight of tea polyphenols, 0.5 parts by weight of hydroxypropyl methylcellulose, and 20 parts by weight of deionized water, stirred at a speed of 400 r / min for 50 minutes, filtered, and dried at 80° C. to obtain modified tourmaline.
[0029] Furthermore, the preparation method of the modified illite is as follows: Take 10 parts by weight of illite, grind it to a particle size of 100 mesh, then add 100 parts by weight of 5% HCl solution, stir at 400 r / min for 1 hour in a 50°C constant temperature water bath, let it stand, cool to room temperature, and then filter to obtain illite powder; Illite powder was mixed with 150 parts by weight of an isopropanol aqueous solution with a concentration of 40% and 1 part by weight of hexadecyltrimethylammonium bromide, reacted at 70° C. in a microwave oven for 60 minutes, allowed to stand to room temperature, centrifuged at 4500 r / min for 5 minutes, and the fixed particles after centrifugation were dried at a constant temperature of 80° C. to obtain a preliminary modified illite powder; The preliminarily modified illite powder was mixed with 3 parts by weight of chitosan and 50 parts by weight of deionized water, stirred at room temperature for 50 minutes at 2000 r / min, then filtered, washed twice with deionized water, and dried at a constant temperature of 80° C. to obtain the modified illite powder.
[0030] In this embodiment, the preparation method of the modified polyethylene glycol is as follows: Take 15 parts by weight of polyethylene glycol and dissolve it in 120 parts by weight of deionized water; Then, 2 parts by weight of 3-amino-1,2-propanediol were added and stirred at 60° C. for 40 min; Then, 1 part by weight of cardanol was added, and stirring was continued for 30 minutes to obtain modified polyethylene glycol.
[0031] Example 3 The embodiment of the present invention provides a bacterium-blocking mushroom packaging material, such as Figure 1 As shown, it includes a meltblown cloth layer and an antibacterial inner layer, and the thickness ratio of the two is 3:1. The antibacterial inner layer includes the following raw materials in parts by weight: 90 parts of EVA, 35 parts of low-density polyethylene, 32.5 parts of linear low-density polyethylene, 8 parts of modified tourmaline, 7.5 parts of modified illite, 12.5 parts of modified polyethylene glycol, 3 parts of zinc stearate, and 3 parts of sodium lignin sulfonate. The production process of the packaging material includes the following steps: Prepare meltblown cloth; Prepare various raw materials for the antibacterial inner layer; The raw materials of the antibacterial inner layer are mixed, and then the antibacterial inner layer is made by extrusion, casting, stretching and heat setting; specifically, the temperature of the feeding section and the homogenizing section in the extrusion step is 195° C., the die head temperature is 210° C., the cooling roller temperature in the casting step is 30° C., the stretching ratio of the film in the stretching step is 1.6, and the heat setting temperature is 68° C.; The antibacterial inner layer and the meltblown cloth are hot-pressed and then naturally cooled to obtain the antibacterial mushroom packaging material.
[0032] Wherein, the preparation method of the modified tourmaline is as follows: Weigh 12.5 parts by weight of tourmaline, clean the surface, dry and then preliminarily crush; Place the mixture in a muffle furnace and heat it to 650°C, calcine it at a constant temperature for 1.5 hours, and grind it to a particle size of 300 meshes after cooling to obtain tourmaline powder; Add 15 times the weight of 30vt% hydrochloric acid solution to the tourmaline powder, soak for 4 hours, filter and wash twice with deionized water; The cleaned tourmaline powder was ground to a particle size of 100 mesh, mixed with 1.5 parts by weight of tea polyphenols, 0.8 parts by weight of hydroxypropyl methylcellulose, and 25 parts by weight of deionized water, stirred at a speed of 450 r / min for 55 minutes, filtered, and dried at 85° C. to obtain modified tourmaline.
[0033] Furthermore, the preparation method of the modified illite is as follows: 12 parts by weight of illite were taken and ground to a particle size of 100 mesh, then 125 parts by weight of a 7.5% HCl solution was added, and the mixture was stirred at 450 r / min for 1.5 h in a 55° C. constant temperature water bath, and then allowed to stand and cooled to room temperature and filtered to obtain illite powder; Illite powder was mixed with 175 parts by weight of an isopropanol aqueous solution with a concentration of 45% and 1.5 parts by weight of hexadecyltrimethylammonium bromide, reacted at 75° C. in a microwave oven for 70 minutes, allowed to stand to room temperature, centrifuged at 4750 r / min for 6.5 minutes, and the fixed particles after centrifugation were dried at a constant temperature of 85° C. to obtain a preliminary modified illite powder; The preliminarily modified illite powder was mixed with 4 parts by weight of chitosan and 55 parts by weight of deionized water, stirred at room temperature for 55 minutes at 2500 r / min, then filtered, washed twice with deionized water, and dried at a constant temperature of 85° C. to obtain the modified illite powder.
[0034] In this embodiment, the preparation method of the modified polyethylene glycol is as follows: Take 17.5 parts by weight of polyethylene glycol and dissolve it in 135 parts by weight of deionized water; Then add 3 parts by weight of 3-amino-1,2-propanediol and stir at 70°C for 50 minutes; Then, 1.5 parts by weight of cardanol was added, and stirring was continued for 40 minutes to obtain modified polyethylene glycol.
[0035] Example 4 The embodiment of the present invention provides a bacterium-blocking mushroom packaging material, such as Figure 1 As shown, it includes a meltblown cloth layer and an antibacterial inner layer, and the thickness ratio of the two is 4:1. The antibacterial inner layer includes the following raw materials in parts by weight: 95 parts of EVA, 37 parts of low-density polyethylene, 35 parts of linear low-density polyethylene, 9 parts of modified tourmaline, 9 parts of modified illite, 14 parts of modified polyethylene glycol, 4 parts of zinc stearate, and 3.5 parts of sodium lignin sulfonate. The production process of the packaging material includes the following steps: Prepare meltblown cloth; Prepare various raw materials for the antibacterial inner layer; The raw materials of the antibacterial inner layer are mixed, and then the antibacterial inner layer is made by extrusion, casting, stretching and heat setting; specifically, the temperature of the feeding section and the homogenizing section in the extrusion step is 210° C., the die head temperature is 220° C., the cooling roller temperature in the casting step is 40° C., the stretching ratio of the film in the stretching step is 1.2, and the heat setting temperature is 70° C.; The antibacterial inner layer and the meltblown cloth are hot-pressed and then naturally cooled to obtain the antibacterial mushroom packaging material.
[0036] Wherein, the preparation method of the modified tourmaline is as follows: Weigh 15 parts by weight of tourmaline, clean the surface, dry and then preliminarily crush; Place the mixture in a muffle furnace and heat it to 700°C, calcine it at a constant temperature for 2 hours, and grind it to a particle size of 400 meshes after cooling to obtain tourmaline powder; Add 20 times the weight of 35vt% hydrochloric acid solution to the tourmaline powder, soak for 5 hours, filter and wash with deionized water three times; The cleaned tourmaline powder was ground to a particle size of 200 mesh, mixed with 2 parts by weight of tea polyphenols, 0.1 parts by weight of hydroxypropyl methylcellulose, and 30 parts by weight of deionized water, stirred at a speed of 500 r / min for 60 minutes, filtered, and dried at 90° C. to obtain modified tourmaline.
[0037] Furthermore, the preparation method of the modified illite is as follows: 14 parts by weight of illite were taken and ground to a particle size of 200 meshes, then 150 parts by weight of a 10% HCl solution was added, and the mixture was stirred at 500 r / min for 2 h in a 60° C. constant temperature water bath, and then allowed to stand and cooled to room temperature before filtering to obtain illite powder; Illite powder was mixed with 200 parts by weight of an isopropanol aqueous solution with a concentration of 50% and 2 parts by weight of hexadecyltrimethylammonium bromide, reacted at 80° C. in a microwave oven for 80 minutes, allowed to stand to room temperature, centrifuged at 5000 r / min for 8 minutes, and the fixed particles after centrifugation were dried at a constant temperature of 90° C. to obtain a preliminary modified illite powder; The preliminarily modified illite powder was mixed with 5 parts by weight of chitosan and 60 parts by weight of deionized water, stirred at room temperature for 60 minutes at 3000 r / min, then filtered, washed with deionized water for 3 times, and dried at a constant temperature of 90° C. to obtain the modified illite powder.
[0038] In this embodiment, the preparation method of the modified polyethylene glycol is as follows: Take 20 parts by weight of polyethylene glycol and dissolve it in 150 parts by weight of deionized water; Then add 4 parts by weight of 3-amino-1,2-propanediol and stir at 80°C for 60 minutes; Then, 2 parts by weight of cardanol were added, and stirring was continued for 50 minutes to obtain modified polyethylene glycol.
[0039] Example 5 The embodiment of the present invention provides a bacterium-blocking mushroom packaging material, such as Figure 1 As shown, it includes a meltblown cloth layer and an antibacterial inner layer, and the thickness ratio of the two is 4:1. The antibacterial inner layer includes the following raw materials in parts by weight: 100 parts of EVA, 40 parts of low-density polyethylene, 40 parts of linear low-density polyethylene, 10 parts of modified tourmaline, 10 parts of modified illite, 15 parts of modified polyethylene glycol, 5 parts of zinc stearate, and 4 parts of sodium lignin sulfonate. The production process of the packaging material includes the following steps: Prepare meltblown cloth; Prepare various raw materials for the antibacterial inner layer; The raw materials of the antibacterial inner layer are mixed, and then the antibacterial inner layer is made by extrusion, casting, stretching and heat setting; specifically, the temperature of the feeding section and the homogenizing section in the extrusion step is 210° C., the die head temperature is 220° C., the cooling roller temperature in the casting step is 40° C., the stretching ratio of the film in the stretching step is 1.2, and the heat setting temperature is 70° C.; The antibacterial inner layer and the meltblown cloth are hot-pressed and then naturally cooled to obtain the antibacterial mushroom packaging material.
[0040] Wherein, the preparation method of the modified tourmaline is as follows: Weigh 15 parts by weight of tourmaline, clean the surface, dry and then preliminarily crush; Place the mixture in a muffle furnace and heat it to 700°C, calcine it at a constant temperature for 2 hours, and grind it to a particle size of 400 meshes after cooling to obtain tourmaline powder; Add 20 times the weight of 35vt% hydrochloric acid solution to the tourmaline powder, soak for 5 hours, filter and wash with deionized water three times; The cleaned tourmaline powder was ground to a particle size of 200 mesh, mixed with 2 parts by weight of tea polyphenols, 0.1 parts by weight of hydroxypropyl methylcellulose, and 30 parts by weight of deionized water, stirred at a speed of 500 r / min for 60 minutes, filtered, and dried at 90° C. to obtain modified tourmaline.
[0041] Furthermore, the preparation method of the modified illite is as follows: 14 parts by weight of illite were taken and ground to a particle size of 200 meshes, then 150 parts by weight of a 10% HCl solution was added, and the mixture was stirred at 500 r / min for 2 h in a 60° C. constant temperature water bath, and then allowed to stand and cooled to room temperature before filtering to obtain illite powder; Illite powder was mixed with 200 parts by weight of an isopropanol aqueous solution with a concentration of 50% and 2 parts by weight of hexadecyltrimethylammonium bromide, reacted at 80° C. in a microwave oven for 80 minutes, allowed to stand to room temperature, centrifuged at 5000 r / min for 8 minutes, and the fixed particles after centrifugation were dried at a constant temperature of 90° C. to obtain a preliminary modified illite powder; The preliminarily modified illite powder was mixed with 5 parts by weight of chitosan and 60 parts by weight of deionized water, stirred at room temperature for 60 minutes at 3000 r / min, then filtered, washed with deionized water for 3 times, and dried at a constant temperature of 90° C. to obtain the modified illite powder.
[0042] In this embodiment, the preparation method of the modified polyethylene glycol is as follows: Take 20 parts by weight of polyethylene glycol and dissolve it in 150 parts by weight of deionized water; Then add 4 parts by weight of 3-amino-1,2-propanediol and stir at 80°C for 60 minutes; Then, 2 parts by weight of cardanol were added, and stirring was continued for 50 minutes to obtain modified polyethylene glycol.
[0043] Example 6 (the difference from Example 3 is that the cleaned tourmaline powder is fermented and then ground) The embodiment of the present invention provides a bacterium-blocking mushroom packaging material, such as Figure 1 As shown, it includes a meltblown cloth layer and an antibacterial inner layer, and the thickness ratio of the two is 3:1. The antibacterial inner layer includes the following raw materials in parts by weight: 90 parts of EVA, 35 parts of low-density polyethylene, 32.5 parts of linear low-density polyethylene, 8 parts of modified tourmaline, 7.5 parts of modified illite, 12.5 parts of modified polyethylene glycol, 3 parts of zinc stearate, and 3 parts of sodium lignin sulfonate. The production process of the packaging material includes the following steps: Prepare meltblown cloth; Prepare various raw materials for the antibacterial inner layer; The raw materials of the antibacterial inner layer are mixed, and then the antibacterial inner layer is made by extrusion, casting, stretching and heat setting; specifically, the temperature of the feeding section and the homogenizing section in the extrusion step is 195° C., the die head temperature is 210° C., the cooling roller temperature in the casting step is 30° C., the stretching ratio of the film in the stretching step is 1.6, and the heat setting temperature is 68° C.; The antibacterial inner layer and the meltblown cloth are hot-pressed and then naturally cooled to obtain the antibacterial mushroom packaging material.
[0044] Wherein, the preparation method of the modified tourmaline is as follows: Weigh 12.5 parts by weight of tourmaline, clean the surface, dry and then preliminarily crush; Place the mixture in a muffle furnace and heat it to 650°C, calcine it at a constant temperature for 1.5 hours, and grind it to a particle size of 300 meshes after cooling to obtain tourmaline powder; Add 15 times the weight of 30vt% hydrochloric acid solution to the tourmaline powder, soak for 4 hours, filter and wash twice with deionized water; The cleaned tourmaline powder is spread flat to a thickness of 0.1-0.3 cm, irradiated with ultraviolet light for 10-20 minutes, then placed in a culture vessel and injected with bacterial cellulose fermentation liquid of Acetobacter xylinum as the strain, wrapped, and cultured at 25-28°C for 3-5 days, the culture product is rinsed with deionized water, the residual culture liquid is removed, and the product is soaked in deionized water for 1-2 days and then filtered; The fermented tourmaline powder was ground to a particle size of 100 mesh, mixed with 1.5 parts by weight of tea polyphenols, 0.8 parts by weight of hydroxypropyl methylcellulose, and 25 parts by weight of deionized water, stirred at a speed of 450 r / min for 55 minutes, filtered, and dried at 85° C. to obtain modified tourmaline.
[0045] Furthermore, the preparation method of the modified illite is as follows: 12 parts by weight of illite were taken and ground to a particle size of 100 mesh, then 125 parts by weight of a 7.5% HCl solution was added, and the mixture was stirred at 450 r / min for 1.5 h in a 55° C. constant temperature water bath, and then allowed to stand and cooled to room temperature and filtered to obtain illite powder; Illite powder was mixed with 175 parts by weight of an isopropanol aqueous solution with a concentration of 45% and 1.5 parts by weight of hexadecyltrimethylammonium bromide, reacted at 75° C. in a microwave oven for 70 minutes, allowed to stand to room temperature, centrifuged at 4750 r / min for 6.5 minutes, and the fixed particles after centrifugation were dried at a constant temperature of 85° C. to obtain a preliminary modified illite powder; The preliminarily modified illite powder was mixed with 4 parts by weight of chitosan and 55 parts by weight of deionized water, stirred at room temperature for 55 minutes at 2500 r / min, then filtered, washed twice with deionized water, and dried at a constant temperature of 85° C. to obtain the modified illite powder.
[0046] In this embodiment, the preparation method of the modified polyethylene glycol is as follows: Take 17.5 parts by weight of polyethylene glycol and dissolve it in 135 parts by weight of deionized water; Then add 3 parts by weight of 3-amino-1,2-propanediol and stir at 70°C for 50 minutes; Then, 1.5 parts by weight of cardanol was added, and stirring was continued for 40 minutes to obtain modified polyethylene glycol.
[0047] In a specific implementation, the preparation method of the bacterial cellulose fermentation liquid with Acetobacter xylinum as the strain is as follows: inoculate Acetobacter xylinum strain into the culture liquid, stir at a stirring speed of 120-180r / min for 3-5min, and then culture at 25-28°C for 36-48h to obtain seed liquid; inoculate the seed liquid with a volume of 10-15% of the culture liquid into the culture liquid, mix well for standby use, and obtain bacterial cellulose fermentation liquid.
[0048] Example 7 (the difference from Example 3 is that the antibacterial inner layer also includes modified nano titanium dioxide) The embodiment of the present invention provides a bacterium-blocking mushroom packaging material, such as Figure 1 As shown, it includes a meltblown cloth layer and an antibacterial inner layer, and the thickness ratio of the two is 3:1. The antibacterial inner layer includes the following raw materials in parts by weight: 90 parts of EVA, 35 parts of low-density polyethylene, 32.5 parts of linear low-density polyethylene, 8 parts of modified tourmaline, 7.5 parts of modified illite, 12.5 parts of modified polyethylene glycol, 3 parts of zinc stearate, 3 parts of sodium lignin sulfonate, and 5 parts of modified nano titanium dioxide. The production process of the packaging material includes the following steps: Prepare meltblown cloth; Prepare various raw materials for the antibacterial inner layer; The raw materials of the antibacterial inner layer are mixed, and then the antibacterial inner layer is made by extrusion, casting, stretching and heat setting; specifically, the temperature of the feeding section and the homogenizing section in the extrusion step is 195° C., the die head temperature is 210° C., the cooling roller temperature in the casting step is 30° C., the stretching ratio of the film in the stretching step is 1.6, and the heat setting temperature is 68° C.; The antibacterial inner layer and the meltblown cloth are hot-pressed and then naturally cooled to obtain the antibacterial mushroom packaging material.
[0049] Wherein, the preparation method of the modified tourmaline is as follows: Weigh 12.5 parts by weight of tourmaline, clean the surface, dry and then preliminarily crush; Place the mixture in a muffle furnace and heat it to 650°C, calcine it at a constant temperature for 1.5 hours, and grind it to a particle size of 300 meshes after cooling to obtain tourmaline powder; Add 15 times the weight of 30vt% hydrochloric acid solution to the tourmaline powder, soak for 4 hours, filter and wash twice with deionized water; The cleaned tourmaline powder was ground to a particle size of 100 mesh, mixed with 1.5 parts by weight of tea polyphenols, 0.8 parts by weight of hydroxypropyl methylcellulose, and 25 parts by weight of deionized water, stirred at a speed of 450 r / min for 55 minutes, filtered, and dried at 85° C. to obtain modified tourmaline.
[0050] Furthermore, the preparation method of the modified illite is as follows: 12 parts by weight of illite were taken and ground to a particle size of 100 mesh, then 125 parts by weight of a 7.5% HCl solution was added, and the mixture was stirred at 450 r / min for 1.5 h in a 55° C. constant temperature water bath, and then allowed to stand and cooled to room temperature and filtered to obtain illite powder; Illite powder was mixed with 175 parts by weight of an isopropanol aqueous solution with a concentration of 45% and 1.5 parts by weight of hexadecyltrimethylammonium bromide, reacted at 75° C. in a microwave oven for 70 minutes, allowed to stand to room temperature, centrifuged at 4750 r / min for 6.5 minutes, and the fixed particles after centrifugation were dried at a constant temperature of 85° C. to obtain a preliminary modified illite powder; The preliminarily modified illite powder was mixed with 4 parts by weight of chitosan and 55 parts by weight of deionized water, stirred at room temperature for 55 minutes at 2500 r / min, then filtered, washed twice with deionized water, and dried at a constant temperature of 85° C. to obtain the modified illite powder.
[0051] In this embodiment, the preparation method of the modified polyethylene glycol is as follows: Take 17.5 parts by weight of polyethylene glycol and dissolve it in 135 parts by weight of deionized water; Then add 3 parts by weight of 3-amino-1,2-propanediol and stir at 70°C for 50 minutes; Then, 1.5 parts by weight of cardanol was added, and stirring was continued for 40 minutes to obtain modified polyethylene glycol.
[0052] In this embodiment, the preparation method of the modified nano titanium dioxide is as follows: Take 10-14 parts by weight of nano titanium dioxide and put it into 70-80 parts by weight of anhydrous ethanol with a pH value of 5-6, containing 10-15% triethanolamine and 5-10% sodium dodecyl sulfate for 2-3 minutes; Add 3-5 parts of resveratrol, place in a 70-80°C water bath and stir for 30-40 minutes, then irradiate with ultraviolet light for 3-5 minutes while stirring, then filter, wash with deionized water 2-3 times, dry at 70-80°C, and grind to obtain modified nano titanium dioxide.
[0053] Comparative Example 1: Compared with Example 3, the modified tourmaline is replaced by ordinary tourmaline.
[0054] Comparative Example 2: Compared with Example 3, the modified illite is replaced by ordinary illite.
[0055] Comparative Example 3: Compared with Example 3, the modified polyethylene glycol was replaced by ordinary polyethylene glycol.
[0056] Comparative Example 4: Compared with Example 3, the modified tourmaline was replaced by ordinary tourmaline, the modified illite was replaced by ordinary illite, and the modified polyethylene glycol was replaced by ordinary polyethylene glycol.
[0057] Comparative Example 5: Compared with Example 7, the modified tourmaline was replaced by ordinary tourmaline.
[0058] Comparative Example 6: Compared with Example 7, the modified nano-titanium dioxide is replaced by ordinary nano-titanium dioxide.
[0059] Comparative Example 7: Compared with Example 7, the modified tourmaline is replaced by ordinary tourmaline and the modified nano-titanium dioxide is replaced by ordinary nano-titanium dioxide.
[0060] Comparative Example 8: A commercially available shiitake mushroom packaging material.
[0061] experiment 1. Antibacterial tests were performed on the packaging materials of Examples 1-7 and Comparative Examples 1-4 to obtain the antibacterial rates against Escherichia coli and Staphylococcus aureus. The results are shown in Table 1 below: Grouping Escherichia coli (%) Staphylococcus aureus (%) Example 1 98.0 98.6 Example 2 98.3 98.8 Example 3 98.6 99.1 Example 4 98.4 99.0 Example 5 98.3 98.8 Example 6 99.9 99.9 Example 7 99.9 99.9 Comparative Example 1 80.1 81.4 Comparative Example 2 81.3 81.8 Comparative Example 3 79.5 80.6 Comparative Example 4 60.2 62.5 It can be seen from the above results that the packaging material of the present invention has excellent antibacterial properties, especially by adding modified tourmaline, modified illite and modified polyethylene glycol, the three have a synergistic effect and can improve the antibacterial properties.
[0062] 2. The packaging materials of Example 7 and Comparative Examples 5-7 were placed in the same closed environment (formaldehyde concentration was 1 mg / m3). After testing, the formaldehyde concentration of the environment was tested 3 hours later. The results are shown in Table 2: Grouping Formaldehyde concentration (㎎ / m3) Example 7 0.35 Comparative Example 5 0.62 Comparative Example 6 0.65 Comparative Example 7 0.82 From the above results, it can be seen that the packaging bag of the present invention has excellent performance in removing formaldehyde, especially through modified tourmaline and modified nano titanium dioxide, both of which can adsorb and decompose formaldehyde, and have a synergistic effect, thereby improving the performance of removing endogenous formaldehyde from shiitake mushrooms.
[0063] It should be noted that, for the above embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described order of actions, because according to the present invention, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.
[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.
Claims
1. A bacteria-blocking mushroom packaging material, characterized in that: It includes a meltblown cloth layer and an antibacterial inner layer, and the thickness ratio of the two is 2-4:
1. The antibacterial inner layer includes the following raw materials in parts by weight: 80-100 parts of EVA, 30-40 parts of low-density polyethylene, 25-40 parts of linear low-density polyethylene, 6-10 parts of modified tourmaline, 5-10 parts of modified illite, 10-15 parts of modified polyethylene glycol, 1-5 parts of zinc stearate, and 2-4 parts of sodium lignin sulfonate.
2. The antibacterial mushroom packaging material according to claim 1, characterized in that: The antibacterial inner layer comprises the following raw materials in parts by weight: 85-95 parts of EVA, 33-37 parts of low-density polyethylene, 30-35 parts of linear low-density polyethylene, 7-9 parts of modified tourmaline, 6-9 parts of modified illite, 11-14 parts of modified polyethylene glycol, 2-4 parts of zinc stearate, and 2.5-3.5 parts of sodium lignin sulfonate.
3. The antibacterial mushroom packaging material according to claim 2, characterized in that: The antibacterial inner layer includes the following raw materials in parts by weight: 90 parts of EVA, 35 parts of low-density polyethylene, 32.5 parts of linear low-density polyethylene, 8 parts of modified tourmaline, 7.5 parts of modified illite, 12.5 parts of modified polyethylene glycol, 3 parts of zinc stearate, and 3 parts of sodium lignin sulfonate.
4. The antibacterial mushroom packaging material according to claim 1, characterized in that: The preparation method of the modified tourmaline is as follows: Weigh 10-15 parts by weight of tourmaline, clean the surface, dry and then grind it preliminarily; Place the mixture in a muffle furnace and heat it to 600-700°C, calcine it at a constant temperature for 1-2 hours, and grind it to a particle size of 300-400 meshes after cooling to obtain tourmaline powder; Add 10-20 times the weight of 25-35vt% hydrochloric acid solution to the tourmaline powder, soak for 3-5 hours, filter and wash with deionized water 2-3 times; The cleaned tourmaline powder is ground to a particle size of 100-200 mesh, mixed with 1-2 parts by weight of tea polyphenols, 0.5-1 parts by weight of hydroxypropyl methylcellulose, and 20-30 parts by weight of deionized water, stirred at a speed of 400-500 r / min for 50-60 minutes, filtered, and dried at 80-90° C. to obtain modified tourmaline.
5. The antibacterial mushroom packaging material according to claim 4, characterized in that: The cleaned tourmaline powder is subjected to fermentation treatment and then ground. The fermentation treatment process is as follows: the cleaned tourmaline powder is spread flat with a thickness of 0.1-0.3 cm, irradiated with ultraviolet rays for 10-20 minutes, then placed in a culture vessel and injected with bacterial cellulose fermentation liquid with Acetobacter xylinum as the strain, wrapped, and cultured at 25-28° C. for 3-5 days, the culture product is rinsed with deionized water, the residual culture liquid is removed, and the product is filtered after being soaked in deionized water for 1-2 days.
6. The antibacterial mushroom packaging material according to claim 5, characterized in that: The preparation method of the bacterial cellulose fermentation liquid with Acetobacter xylinum as the strain is as follows: inoculating Acetobacter xylinum strains into a culture liquid, stirring at a stirring speed of 120-180 r / min for 3-5 minutes, and then statically culturing at 25-28° C. for 36-48 hours to obtain a seed liquid; inoculating the seed liquid with a volume of 10-15% of the culture liquid into the culture liquid, mixing and setting aside to obtain a bacterial cellulose fermentation liquid.
7. The antibacterial mushroom packaging material according to claim 1, characterized in that: The preparation method of the modified illite is as follows: Take 10-14 parts by weight of illite, grind it to a particle size of 100-200 mesh, then add 100-150 parts by weight of 5-10% HCl solution, stir at 400-500r / min for 1-2h in a constant temperature water bath of 50-60°C, let it stand, cool to room temperature, and then filter to obtain illite powder; The illite powder is mixed with 150-200 parts by weight of an isopropanol aqueous solution with a concentration of 40-50% and 1-2 parts by weight of hexadecyltrimethylammonium bromide, reacted in a microwave oven at 70-80° C. for 60-80 minutes, allowed to stand to room temperature, centrifuged at 4500-5000 r / min for 5-8 minutes, and the fixed particles after centrifugation are dried at a constant temperature of 80-90° C. to obtain a preliminary modified illite powder; The preliminarily modified illite powder is mixed with 3-5 parts by weight of chitosan and 50-60 parts by weight of deionized water, stirred at room temperature for 50-60 minutes at 2000-3000 r / min, then filtered, washed with deionized water 2-3 times, and dried at a constant temperature of 80-90° C. to obtain the modified illite powder.
8. The antibacterial mushroom packaging material according to claim 1, characterized in that: The preparation method of the modified polyethylene glycol is as follows: Take 15-20 parts by weight of polyethylene glycol and dissolve it in 120-150 parts by weight of deionized water; Then add 2-4 parts by weight of 3-amino-1,2-propylene glycol and stir at 60-80°C for 40-60 minutes; Then, 1-2 parts by weight of cardanol is added, and stirring is continued for 30-50 minutes to obtain modified polyethylene glycol.
9. The antibacterial mushroom packaging material according to claim 1, characterized in that: The antibacterial inner layer also includes 3-7 parts of modified nano titanium dioxide, and the preparation method of the modified nano titanium dioxide is as follows: Take 10-14 parts by weight of nano titanium dioxide and put it into 70-80 parts by weight of anhydrous ethanol with a pH value of 5-6, containing 10-15% triethanolamine and 5-10% sodium dodecyl sulfate for 2-3 minutes; Add 3-5 parts of resveratrol, place in a 70-80°C water bath and stir for 30-40 minutes, then irradiate with ultraviolet light for 3-5 minutes while stirring, then filter, wash with deionized water 2-3 times, dry at 70-80°C, and grind to obtain modified nano titanium dioxide.
10. The production process of the antibacterial mushroom packaging material according to any one of claims 1 to 9, characterized in that: The steps include: Prepare meltblown cloth; Prepare various raw materials for the antibacterial inner layer; The raw materials of the antibacterial inner layer are mixed, and then the antibacterial inner layer is made by extrusion, casting, stretching and heat setting; The antibacterial inner layer and the meltblown cloth are hot-pressed and then naturally cooled to obtain the antibacterial mushroom packaging material.