CN117511047B - Antibacterial and mildew-proof polypropylene edible fungus bag film and preparation method thereof - Google Patents
Antibacterial and mildew-proof polypropylene edible fungus bag film and preparation method thereof Download PDFInfo
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 45
- -1 polypropylene Polymers 0.000 title claims abstract description 45
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 45
- 241000233866 Fungi Species 0.000 title claims abstract description 40
- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 183
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 67
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 64
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 42
- 239000003607 modifier Substances 0.000 claims abstract description 41
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 22
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 21
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000000243 solution Substances 0.000 claims description 97
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 66
- 239000003795 chemical substances by application Substances 0.000 claims description 39
- 238000003756 stirring Methods 0.000 claims description 35
- 238000001035 drying Methods 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000000498 ball milling Methods 0.000 claims description 29
- 238000005406 washing Methods 0.000 claims description 27
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 18
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 18
- 238000010096 film blowing Methods 0.000 claims description 18
- 239000004115 Sodium Silicate Substances 0.000 claims description 17
- ICAKDTKJOYSXGC-UHFFFAOYSA-K lanthanum(iii) chloride Chemical compound Cl[La](Cl)Cl ICAKDTKJOYSXGC-UHFFFAOYSA-K 0.000 claims description 17
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 17
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 16
- NGDQQLAVJWUYSF-UHFFFAOYSA-N 4-methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride Chemical compound S1C(S(Cl)(=O)=O)=C(C)N=C1C1=CC=CC=C1 NGDQQLAVJWUYSF-UHFFFAOYSA-N 0.000 claims description 15
- 229910052746 lanthanum Inorganic materials 0.000 claims description 15
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 15
- 239000001509 sodium citrate Substances 0.000 claims description 15
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 238000009210 therapy by ultrasound Methods 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000007664 blowing Methods 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 12
- 235000021355 Stearic acid Nutrition 0.000 claims description 10
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 10
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 10
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 10
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 10
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 10
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 10
- 239000008117 stearic acid Substances 0.000 claims description 10
- 229920001661 Chitosan Polymers 0.000 claims description 9
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 9
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 9
- 239000007853 buffer solution Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 claims description 9
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 9
- 239000012286 potassium permanganate Substances 0.000 claims description 9
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000000967 suction filtration Methods 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 4
- 230000035699 permeability Effects 0.000 abstract description 7
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 15
- 230000000694 effects Effects 0.000 description 11
- 239000008055 phosphate buffer solution Substances 0.000 description 6
- 238000011068 loading method Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 3
- 241000588724 Escherichia coli Species 0.000 description 2
- OJMOMXZKOWKUTA-UHFFFAOYSA-N aluminum;borate Chemical compound [Al+3].[O-]B([O-])[O-] OJMOMXZKOWKUTA-UHFFFAOYSA-N 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 240000006499 Flammulina velutipes Species 0.000 description 1
- 235000016640 Flammulina velutipes Nutrition 0.000 description 1
- 240000000588 Hericium erinaceus Species 0.000 description 1
- 235000007328 Hericium erinaceus Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 235000019794 sodium silicate Nutrition 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- 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
- C08J2323/08—Copolymers of ethene
-
- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—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
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/08—Oxygen-containing compounds
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
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- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
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- C08K9/08—Ingredients agglomerated by treatment with a binding agent
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to the technical field of edible fungi bag films, and in particular discloses an antibacterial and mildew-proof polypropylene edible fungi bag film which comprises the following raw materials in parts by weight: 25-30 parts of linear low-density polyethylene, 15-20 parts of polypropylene, 8-12 parts of nano silver, 6-10 parts of nano calcium carbonate, 15-20 parts of nano silicon dioxide treatment solution and 7-11 parts of coordination modifier. The antibacterial and mildew-proof polypropylene edible fungus bag film adopts the linear low-density polyethylene and the polypropylene to be matched with the nano silver and the nano calcium carbonate, and the added nano silicon dioxide treatment liquid and the coordination modifier are mutually coordinated by mutual coordination, so that the antibacterial and mildew-proof performance and the moisture permeability of the product are mutually coordinated, the performance of the product is improved in a coordinated manner, the tearing strength performance of the product is excellent, and the performance synergistic enhancement of the product can be realized.
Description
Technical Field
The invention relates to the technical field of edible fungus bag films, in particular to an antibacterial and mildew-proof polypropylene edible fungus bag film and a preparation method thereof.
Background
At present, three modes of box loading, bed loading and bag loading exist for edible fungi, but the bag loading mode is widely used, such as mushrooms, hericium erinaceus, black fungus, flammulina velutipes and the like, and in edible fungi bag cultivation, the common fungus bag is used together with a plastic lantern ring and a cotton plug in the fungus bag processing process.
The existing edible fungus bag film has poor moisture permeability, influences the growth of edible fungi, and meanwhile, in order to improve the moisture permeability of the product, the edible fungi are easy to pollute by bacteria, and the product has poor antibacterial and mildew-proof properties.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an antibacterial and mildew-proof polypropylene edible fungus bag film and a preparation method thereof, so as to solve the problems in the background art.
The invention solves the technical problems by adopting the following technical scheme:
The invention provides an antibacterial mildew-proof polypropylene edible fungus bag film, which comprises the following raw materials in parts by weight:
25-30 parts of linear low-density polyethylene, 15-20 parts of polypropylene, 8-12 parts of nano silver, 6-10 parts of nano calcium carbonate, 15-20 parts of nano silicon dioxide treatment solution and 7-11 parts of coordination modifier.
Preferably, the linear low density polyethylene has a melt index of 1-2g/10min; the melt index of the polypropylene is 0.5-1.5g/10min; the grain diameter of the nano calcium carbonate is 50-60nm; the grain diameter of the nano silver is 20-30nm.
Preferably, the preparation method of the nano silicon dioxide treatment fluid comprises the following steps:
S01: heat treating nanometer silicon dioxide at 150-170deg.C for 5-10min, heating to 255-265deg.C at 2-5deg.C/min, maintaining for 2-5min, cooling to 55deg.C at 1-3deg.C/min, and maintaining;
S02: adding 3-5 parts of sodium dodecyl benzene sulfonate and 1-3 parts of silane coupling agent KH560 into 10-15 parts of ethanol solvent, then adding 2-4 parts of sodium citrate solution and 1-2 parts of yttrium nitrate solution, and stirring and mixing uniformly to obtain treating agent liquid;
s03: mixing the nano silicon dioxide treated by the S01 and the whisker regulator according to the weight ratio of 1:3, performing ultrasonic treatment, washing and drying to obtain the whisker-regulated nano silicon dioxide;
s04: the whisker-regulated nano silicon dioxide agent and the treating agent liquid are uniformly mixed according to the weight ratio of 2:5, so as to obtain the nano silicon dioxide treating liquid.
Preferably, the yttrium nitrate solution has a mass fraction of 4-7%; the mass fraction of the sodium citrate solution is 10-15%.
Preferably, the ultrasonic power of the mixed ultrasonic treatment is 350-400W, and the treatment time is 1-2h.
Preferably, the preparation method of the whisker regulator comprises the following steps:
Placing the calcium sulfate whisker into a lanthanum chloride solution with the total amount of 3-5 times of the calcium sulfate whisker, uniformly stirring, and then carrying out suction filtration and drying to obtain a lanthanum-treated calcium sulfate whisker agent;
3-5 parts of lanthanum-treated calcium sulfate whisker agent, 5-7 parts of sodium silicate solution, 1-3 parts of sodium carboxymethyl cellulose and 0.35-0.45 part of stearic acid, mixing and ball milling treatment, wherein the ball milling rotating speed is 1000-1500r/min, ball milling is carried out for 1-2 hours, and the whisker regulator is obtained after ball milling.
Preferably, the mass fraction of the lanthanum chloride solution is 3-5%; the mass fraction of the sodium silicate solution is 10-15%.
Preferably, the preparation method of the coordination modifier comprises the following steps:
S101: placing diatomite into a potassium permanganate solution with the mass fraction of 5% which is 2-3 times of that of the diatomite, uniformly stirring, washing with water, drying, uniformly stirring in a hydrochloric acid solution with the mass fraction of 2% which is 3-5 times of that of the diatomite, washing with water, and drying;
The dried diatomite is sent to 310-320 ℃ for heat treatment for 10-15min, then cooled to 165-175 ℃ at the speed of 2-5 ℃/min, kept for 5-10min, and finally cooled to room temperature at the speed of 1-3 ℃/min;
s102: 10-15 parts of diatomite treated by S101, 30-35 parts of deionized water, 2-5 parts of chitosan solution with mass fraction of 5%, 1-3 parts of sodium lignin sulfonate and 1-2 parts of phosphoric acid buffer solution are stirred and mixed uniformly, and finally the mixture is washed with water and dried to obtain the coordination modifier.
Preferably, the pH of the phosphate buffer solution is 5.0.
The invention also provides a preparation method of the antibacterial and mildew-proof polypropylene edible fungus bag film, which comprises the following steps:
Stirring and mixing nano silver, nano calcium carbonate, a coordination modifier and nano silicon dioxide treatment liquid uniformly, washing with water, drying, fully mixing with linear low density polyethylene and polypropylene, extruding and granulating in a double-screw extruder at 190-200 ℃, and then blowing a film for forming, wherein a film blowing machine is adopted for blowing a film, and the length-diameter ratio of a screw is 30:1; the film blowing temperature is 160-180 ℃, and the film blowing is finished to obtain the edible fungus bag film.
Compared with the prior art, the invention has the following beneficial effects:
1. According to the antibacterial and mildew-proof polypropylene edible fungus bag film, the linear low-density polyethylene and the polypropylene are matched with the nano silver and the nano calcium carbonate, and the raw materials are coordinated with each other, so that the added nano silicon dioxide treatment liquid and the coordination modifier are coordinated with each other to mutually coordinate, the antibacterial and mildew-proof performance and the moisture permeability of the product are improved in a coordinated manner, the tearing strength performance of the product is excellent, and the performance of the product is enhanced in a coordinated manner;
2. The nano silicon dioxide treatment fluid adopts nano silicon dioxide to heat treat for 5-10min at 150-170 ℃, then heats up to 255-265 ℃ at the speed of 2-5 ℃/min, keeps the temperature for 2-5min, then cools down to 55 ℃ at the speed of 1-3 ℃/min, obtains the nano silicon dioxide with strong activity stability through the steps, heats up and processes in a constant temperature cooling mode, and then cooperates with whisker regulator for ultrasonic treatment, the adopted whisker regulator takes calcium sulfate whisker as a matrix, cooperates with nano silicon dioxide in a whisker-like structure dispersion system, thereby enhancing the interfacial effect of the raw materials of the system in the whisker-like structure dispersion system, and the obtained lanthanum-treated calcium sulfate whisker agent is mixed with sodium silicate solution, sodium carboxymethylcellulose and stearic acid for ball milling treatment, so that the synergistic effect with the nano silicon dioxide is further enhanced;
3. the treated whisker-regulated nano silicon dioxide agent is matched with a treating agent liquid obtained by adding sodium dodecyl benzene sulfonate, a silane coupling agent KH560, a sodium citrate solution and a yttrium nitrate solution, and the raw materials are mutually blended and reinforced together, so that the nano silver and the nano calcium carbonate of the system and the coordination modifier are better cooperated with the raw materials of the product of the system, the antibacterial property and the moisture permeability of the obtained product are further improved in a coordinated manner, and the tearing strength performance of the product is obviously enhanced;
4. the coordination modifier is prepared by treating diatomite with potassium permanganate solution and hydrochloric acid solution, the activity and the dispersity of the obtained diatomite are enhanced, then the diatomite is matched with the heat treatment at 310-320 ℃ for 10-15min, then the diatomite is cooled to 165-175 ℃ at the speed of 2-5 ℃/min, the temperature is kept for 5-10min, finally the diatomite is cooled to room temperature at the speed of 1-3 ℃/min, the activity effect of the diatomite is further optimized, the coordination modifier and the nano silicon dioxide treatment solution are further enhanced by the coordination improvement of chitosan solution, sodium lignin sulfonate and phosphoric acid buffer solution, and the performance of the product is obviously improved.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The antibacterial and mildew-proof polypropylene edible fungus bag film comprises the following raw materials in parts by weight:
25-30 parts of linear low-density polyethylene, 15-20 parts of polypropylene, 8-12 parts of nano silver, 6-10 parts of nano calcium carbonate, 15-20 parts of nano silicon dioxide treatment solution and 7-11 parts of coordination modifier.
The linear low density polyethylene of this example has a melt index of 1-2g/10min; the melt index of the polypropylene is 0.5-1.5g/10min; the grain diameter of the nano calcium carbonate is 50-60nm; the grain diameter of the nano silver is 20-30nm.
The preparation method of the nano silicon dioxide treatment fluid in the embodiment comprises the following steps:
S01: heat treating nanometer silicon dioxide at 150-170deg.C for 5-10min, heating to 255-265deg.C at 2-5deg.C/min, maintaining for 2-5min, cooling to 55deg.C at 1-3deg.C/min, and maintaining;
S02: adding 3-5 parts of sodium dodecyl benzene sulfonate and 1-3 parts of silane coupling agent KH560 into 10-15 parts of ethanol solvent, then adding 2-4 parts of sodium citrate solution and 1-2 parts of yttrium nitrate solution, and stirring and mixing uniformly to obtain treating agent liquid;
s03: mixing the nano silicon dioxide treated by the S01 and the whisker regulator according to the weight ratio of 1:3, performing ultrasonic treatment, washing and drying to obtain the whisker-regulated nano silicon dioxide;
s04: the whisker-regulated nano silicon dioxide agent and the treating agent liquid are uniformly mixed according to the weight ratio of 2:5, so as to obtain the nano silicon dioxide treating liquid.
The mass fraction of the yttrium nitrate solution in the embodiment is 4-7%; the mass fraction of the sodium citrate solution is 10-15%.
The ultrasonic power of the mixed ultrasonic treatment of the embodiment is 350-400W, and the treatment time is 1-2h.
The preparation method of the whisker regulator in the embodiment comprises the following steps:
Placing the calcium sulfate whisker into a lanthanum chloride solution with the total amount of 3-5 times of the calcium sulfate whisker, uniformly stirring, and then carrying out suction filtration and drying to obtain a lanthanum-treated calcium sulfate whisker agent;
3-5 parts of lanthanum-treated calcium sulfate whisker agent, 5-7 parts of sodium silicate solution, 1-3 parts of sodium carboxymethyl cellulose and 0.35-0.45 part of stearic acid, mixing and ball milling treatment, wherein the ball milling rotating speed is 1000-1500r/min, ball milling is carried out for 1-2 hours, and the whisker regulator is obtained after ball milling.
The mass fraction of the lanthanum chloride solution in the embodiment is 3-5%; the mass fraction of the sodium silicate solution is 10-15%.
The preparation method of the coordination modifier comprises the following steps:
S101: placing diatomite into a potassium permanganate solution with the mass fraction of 5% which is 2-3 times of that of the diatomite, uniformly stirring, washing with water, drying, uniformly stirring in a hydrochloric acid solution with the mass fraction of 2% which is 3-5 times of that of the diatomite, washing with water, and drying;
The dried diatomite is sent to 310-320 ℃ for heat treatment for 10-15min, then cooled to 165-175 ℃ at the speed of 2-5 ℃/min, kept for 5-10min, and finally cooled to room temperature at the speed of 1-3 ℃/min;
s102: 10-15 parts of diatomite treated by S101, 30-35 parts of deionized water, 2-5 parts of chitosan solution with mass fraction of 5%, 1-3 parts of sodium lignin sulfonate and 1-2 parts of phosphoric acid buffer solution are stirred and mixed uniformly, and finally the mixture is washed with water and dried to obtain the coordination modifier.
The pH of the phosphate buffer solution of this example was 5.0.
The preparation method of the antibacterial and mildew-proof polypropylene edible fungus bag film comprises the following steps:
Stirring and mixing nano silver, nano calcium carbonate, a coordination modifier and nano silicon dioxide treatment liquid uniformly, washing with water, drying, fully mixing with linear low density polyethylene and polypropylene, extruding and granulating in a double-screw extruder at 190-200 ℃, and then blowing a film for forming, wherein a film blowing machine is adopted for blowing a film, and the length-diameter ratio of a screw is 30:1; the film blowing temperature is 160-180 ℃, and the film blowing is finished to obtain the edible fungus bag film.
Example 1.
The antibacterial and mildew-proof polypropylene edible fungus bag film comprises the following raw materials in parts by weight:
25 parts of linear low-density polyethylene, 15 parts of polypropylene, 8 parts of nano silver, 6 parts of nano calcium carbonate, 15 parts of nano silicon dioxide treatment fluid and 7 parts of coordination modifier.
The linear low density polyethylene of this example has a melt index of 1g/10min; the melt index of the polypropylene is 0.5g/10min; the grain diameter of the nano calcium carbonate is 50nm; the grain diameter of the nano silver is 20-30nm.
The preparation method of the nano silicon dioxide treatment fluid in the embodiment comprises the following steps:
S01: heat-treating nano silicon dioxide at 150 ℃ for 5min, then heating to 255 ℃ at the speed of 2 ℃/min, preserving heat for 2min, then cooling to 55 ℃ at the speed of 1 ℃/min, and preserving heat for later use;
S02: adding 3 parts of sodium dodecyl benzene sulfonate and 1 part of silane coupling agent KH560 into 10 parts of ethanol solvent, then adding 2 parts of sodium citrate solution and 1 part of yttrium nitrate solution, and stirring and mixing uniformly to obtain treating agent liquid;
s03: mixing the nano silicon dioxide treated by the S01 and the whisker regulator according to the weight ratio of 1:3, performing ultrasonic treatment, washing and drying to obtain the whisker-regulated nano silicon dioxide;
s04: the whisker-regulated nano silicon dioxide agent and the treating agent liquid are uniformly mixed according to the weight ratio of 2:5, so as to obtain the nano silicon dioxide treating liquid.
The mass fraction of the yttrium nitrate solution in the embodiment is 4%; the mass fraction of the sodium citrate solution is 10%.
The ultrasonic power of the mixed ultrasonic treatment of this example was 350W and the treatment time was 1h.
The preparation method of the whisker regulator in the embodiment comprises the following steps:
Placing the calcium sulfate whisker into a lanthanum chloride solution with the total amount of 3 times of the calcium sulfate whisker, uniformly stirring, and then carrying out suction filtration and drying to obtain a lanthanum-treated calcium sulfate whisker agent;
3 parts of lanthanum-treated calcium sulfate whisker agent, 5 parts of sodium silicate solution, 1 part of sodium carboxymethyl cellulose and 0.35 part of stearic acid, mixing and ball milling treatment, wherein the ball milling rotating speed is 1000r/min, ball milling is carried out for 1h, and the whisker regulator is obtained after ball milling.
The mass fraction of the lanthanum chloride solution in the embodiment is 3%; the mass fraction of the sodium silicate solution is 10%.
The preparation method of the coordination modifier comprises the following steps:
S101: placing diatomite into a potassium permanganate solution with the mass fraction of 5% which is 2 times that of the diatomite, uniformly stirring, washing with water, drying, uniformly stirring in a hydrochloric acid solution with the mass fraction of 2% which is 3 times that of the diatomite, washing with water, and drying;
The dried diatomite is sent to 310 ℃ for heat treatment for 10min, then cooled to 165 ℃ at the speed of 2 ℃/min, kept for 5min, and finally cooled to room temperature at the speed of 1 ℃/min;
S102: 10 parts of diatomite treated by S101, 30 parts of deionized water, 2 parts of chitosan solution with mass fraction of 5%, 1 part of sodium lignin sulfonate and 1 part of phosphoric acid buffer solution are stirred and mixed uniformly, and finally washed with water and dried to obtain the coordination modifier.
The pH of the phosphate buffer solution of this example was 5.0.
The preparation method of the antibacterial and mildew-proof polypropylene edible fungus bag film comprises the following steps:
Stirring and mixing nano silver, nano calcium carbonate, a coordination modifier and nano silicon dioxide treatment liquid uniformly, washing with water, drying, fully mixing with linear low density polyethylene and polypropylene, extruding and granulating in a double-screw extruder at 190-200 ℃, and then blowing a film for forming, wherein a film blowing machine is adopted for blowing a film, and the length-diameter ratio of a screw is 30:1; the film blowing temperature is 160-180 ℃, and the film blowing is finished to obtain the edible fungus bag film.
Example 2.
The antibacterial and mildew-proof polypropylene edible fungus bag film comprises the following raw materials in parts by weight:
30 parts of linear low-density polyethylene, 20 parts of polypropylene, 12 parts of nano silver, 10 parts of nano calcium carbonate, 20 parts of nano silicon dioxide treatment fluid and 11 parts of coordination modifier.
The linear low density polyethylene of this example has a melt index of 2g/10min; the melt index of the polypropylene is 1.5g/10min; the grain diameter of the nano calcium carbonate is 60nm; the particle size of the nano silver is 30nm.
The preparation method of the nano silicon dioxide treatment fluid in the embodiment comprises the following steps:
S01: heat-treating nano silicon dioxide at 170 ℃ for 10min, heating to 265 ℃ at a rate of 5 ℃/min, preserving heat for 5min, cooling to 55 ℃ at a rate of 3 ℃/min, and preserving heat for later use;
S02: adding 5 parts of sodium dodecyl benzene sulfonate and 3 parts of silane coupling agent KH560 into 15 parts of ethanol solvent, then adding 4 parts of sodium citrate solution and 2 parts of yttrium nitrate solution, and stirring and mixing uniformly to obtain treating agent liquid;
s03: mixing the nano silicon dioxide treated by the S01 and the whisker regulator according to the weight ratio of 1:3, performing ultrasonic treatment, washing and drying to obtain the whisker-regulated nano silicon dioxide;
s04: the whisker-regulated nano silicon dioxide agent and the treating agent liquid are uniformly mixed according to the weight ratio of 2:5, so as to obtain the nano silicon dioxide treating liquid.
The mass fraction of the yttrium nitrate solution in the embodiment is 7%; 15% of sodium citrate solution.
The ultrasonic power of the mixed ultrasonic treatment of this example was 400W and the treatment time was 2h.
The preparation method of the whisker regulator in the embodiment comprises the following steps:
placing the calcium sulfate whisker into a lanthanum chloride solution with the total amount of 5 times of the calcium sulfate whisker, uniformly stirring, and then carrying out suction filtration and drying to obtain a lanthanum-treated calcium sulfate whisker agent;
5 parts of lanthanum-treated calcium sulfate whisker agent, 7 parts of sodium silicate solution, 3 parts of sodium carboxymethylcellulose and 0.45 part of stearic acid, mixing and ball milling treatment, wherein the ball milling rotating speed is 1500r/min, ball milling is carried out for 2 hours, and the whisker regulator is obtained after ball milling.
The mass fraction of the lanthanum chloride solution in the embodiment is 5%; the mass fraction of the sodium silicate solution was 15%.
The preparation method of the coordination modifier comprises the following steps:
S101: placing diatomite into a potassium permanganate solution with the mass fraction of 5% which is 3 times that of the diatomite, uniformly stirring, washing with water, drying, uniformly stirring in a hydrochloric acid solution with the mass fraction of 2% which is 5 times that of the diatomite, washing with water, and drying;
The dried diatomite is sent to 320 ℃ for heat treatment for 15min, then cooled to 175 ℃ at the speed of 5 ℃/min, kept for 10min, and finally cooled to room temperature at the speed of 3 ℃/min;
s102: 15 parts of diatomite treated by S101, 35 parts of deionized water, 5 parts of chitosan solution with mass fraction of 5%, 3 parts of sodium lignin sulfonate and 2 parts of phosphoric acid buffer solution are stirred and mixed uniformly, and finally the mixture is washed with water and dried to obtain the coordination modifier.
The pH of the phosphate buffer solution of this example was 5.0.
The preparation method of the antibacterial and mildew-proof polypropylene edible fungus bag film comprises the following steps:
Stirring and mixing nano silver, nano calcium carbonate, a coordination modifier and nano silicon dioxide treatment liquid uniformly, washing with water, drying, fully mixing with linear low density polyethylene and polypropylene, extruding and granulating in a double-screw extruder at 190-200 ℃, and then blowing a film for forming, wherein a film blowing machine is adopted for blowing a film, and the length-diameter ratio of a screw is 30:1; the film blowing temperature is 160-180 ℃, and the film blowing is finished to obtain the edible fungus bag film.
Example 3.
The antibacterial and mildew-proof polypropylene edible fungus bag film comprises the following raw materials in parts by weight:
27.5 parts of linear low-density polyethylene, 17.5 parts of polypropylene, 10 parts of nano silver, 8 parts of nano calcium carbonate, 17.5 parts of nano silicon dioxide treatment solution and 9 parts of coordination modifier.
The linear low density polyethylene of this example has a melt index of 1.5g/10min; the melt index of the polypropylene is 1.0g/10min; the grain diameter of the nano calcium carbonate is 55nm; the particle size of the nano silver is 25nm.
The preparation method of the nano silicon dioxide treatment fluid in the embodiment comprises the following steps:
S01: heat-treating nano silicon dioxide at 160 ℃ for 7.5min, then heating to 260 ℃ at the speed of 3.5 ℃/min, preserving heat for 3.5min, then cooling to 55 ℃ at the speed of 2 ℃/min, and preserving heat for later use;
S02: adding 4 parts of sodium dodecyl benzene sulfonate and 2 parts of silane coupling agent KH560 into 12.5 parts of ethanol solvent, then adding 3 parts of sodium citrate solution and 1.5 parts of yttrium nitrate solution, and stirring and mixing uniformly to obtain treating agent liquid;
s03: mixing the nano silicon dioxide treated by the S01 and the whisker regulator according to the weight ratio of 1:3, performing ultrasonic treatment, washing and drying to obtain the whisker-regulated nano silicon dioxide;
s04: the whisker-regulated nano silicon dioxide agent and the treating agent liquid are uniformly mixed according to the weight ratio of 2:5, so as to obtain the nano silicon dioxide treating liquid.
The mass fraction of the yttrium nitrate solution in the embodiment is 5.5%; 12.5% of sodium citrate solution.
The ultrasonic power of the mixed ultrasonic treatment of this example was 370W and the treatment time was 1.5h.
The preparation method of the whisker regulator in the embodiment comprises the following steps:
Placing the calcium sulfate whisker into a lanthanum chloride solution with the total amount of 4 times of the calcium sulfate whisker, uniformly stirring, and then carrying out suction filtration and drying to obtain a lanthanum-treated calcium sulfate whisker agent;
4 parts of lanthanum-treated calcium sulfate whisker agent, 6 parts of sodium silicate solution, 2 parts of sodium carboxymethylcellulose and 0.40 part of stearic acid, mixing and ball milling treatment, wherein the ball milling rotating speed is 1250r/min, ball milling is carried out for 1.5 hours, and the whisker regulator is obtained after ball milling.
The mass fraction of the lanthanum chloride solution in this example was 4%; the mass fraction of the sodium silicate solution was 12.5%.
The preparation method of the coordination modifier comprises the following steps:
s101: placing diatomite into a potassium permanganate solution with the mass fraction of 5% which is 2.5 times that of the diatomite, uniformly stirring, washing with water, drying, uniformly stirring in a hydrochloric acid solution with the mass fraction of 2% which is 4 times that of the diatomite, washing with water, and drying;
The dried diatomite is sent to 315 ℃ for heat treatment for 12.5min, then cooled to 170 ℃ at the speed of 3.5 ℃/min, kept for 7.5min, and finally cooled to room temperature at the speed of 2 ℃/min;
s102: and (3) uniformly stirring and mixing 12.5 parts of diatomite treated by S101, 32.5 parts of deionized water, 3.5 parts of chitosan solution with the mass fraction of 5%, 2 parts of sodium lignin sulfonate and 1.5 parts of phosphoric acid buffer solution, and finally washing and drying to obtain the coordination modifier.
The pH of the phosphate buffer solution of this example was 5.0.
The preparation method of the antibacterial and mildew-proof polypropylene edible fungus bag film comprises the following steps:
Stirring and mixing nano silver, nano calcium carbonate, a coordination modifier and nano silicon dioxide treatment liquid uniformly, washing with water, drying, fully mixing with linear low density polyethylene and polypropylene, extruding and granulating in a double-screw extruder at 190-200 ℃, and then blowing a film for forming, wherein a film blowing machine is adopted for blowing a film, and the length-diameter ratio of a screw is 30:1; the film blowing temperature is 160-180 ℃, and the film blowing is finished to obtain the edible fungus bag film.
Comparative example 1.
The difference from example 3 is that no nano-silica treatment solution was used.
Comparative example 2.
The difference from example 3 is that the treatment of the nano silica treatment solution was not performed by the step S01.
Comparative example 3.
The difference from example 3 is that in step S01, no heating to 260℃at a rate of 3.5℃per minute was employed, and the temperature was kept for 3.5 minutes.
Comparative example 4.
The difference from example 3 is that the nano silica treatment liquid treatment was not treated with whisker controlling agent.
Comparative example 5.
The difference from example 3 is that the sodium citrate solution and the yttrium nitrate solution are not added into the treating agent liquid in the nano-silica treating liquid treatment.
Comparative example 6.
The difference from example 3 is that sodium dodecylbenzene sulfonate and silane coupling agent KH560 are not added to the treating agent liquid in the treatment of the nano silica treating liquid.
Comparative example 7.
The difference from example 3 is that no co-modifier is added.
Comparative example 8.
The difference from example 3 is that the preparation of the co-ordinated modifier is not carried out by heat treatment at 315℃for 12.5min, then cooling to 170℃at a rate of 3.5℃per min, incubating for 7.5min and finally cooling to room temperature at a rate of 2℃per min.
Comparative example 9.
The difference from example 3 is that the preparation of the coordination modifier is not carried out by placing the coordination modifier in a potassium permanganate solution with the mass fraction of 5% which is 2.5 times of that of diatomite, stirring uniformly, washing with water, drying, stirring uniformly in a hydrochloric acid solution with the mass fraction of 2% which is 4 times of that of diatomite, washing with water, and drying.
Comparative example 10.
The difference from example 3 is that no chitosan solution, sodium lignin sulfonate and phosphate buffer solution were added in the preparation of the co-ordination modifier.
Examples 1 to 3 and comparative examples 1 to 10 were tested for antibacterial properties, and E.coli was used as an example, and the products were tested for 24 hours, 72 hours and the antibacterial rate as measured, and also for moisture permeability and right angle tear strength, as shown in the following results
From examples 1 to 3 and comparative examples 1 to 10,
The product of the embodiment 3 of the invention has excellent durability of the antibacterial rate of the escherichia coli, and simultaneously the moisture permeability, the right-angle tear strength and the antibacterial mildew-proof effective period can realize the effect of improving coordination, so that the performance of the product is integrally improved;
As shown in comparative examples 1-6 and example 3, the performance of the product is remarkably deteriorated, the nano silicon dioxide treatment liquid is not treated in the step S01, the temperature is not raised to 260 ℃ at the speed of 3.5 ℃/min in the step S01, the temperature is kept for 3.5min, the whisker regulator is not treated in the nano silicon dioxide treatment liquid, the sodium citrate solution, the yttrium nitrate solution and the sodium dodecyl benzene sulfonate and the silane coupling agent KH560 are not added in the treatment agent liquid in the nano silicon dioxide treatment liquid, the performance of the product is deteriorated, the whisker regulator is not treated in the nano silicon dioxide treatment liquid, the performance deterioration of the product is obvious, and the nano silicon dioxide treatment liquid prepared by the method, the whisker regulator matched with the method and the nano silicon dioxide treatment liquid matched with the step S01 of the method has the most obvious effect of improving the performance of the product;
as shown in comparative examples 1, 7 and 3, one of the coordination modifier and the nano silicon dioxide treatment liquid is not added, the performance of the product is obviously poor, and the product has the most obvious performance effect by adopting the cooperation of the coordination modifier and the nano silicon dioxide treatment liquid;
From comparative examples 7 to 10 and example 3, the preparation of the coordination modifier is carried out without heat treatment at 315 ℃ for 12.5min, then cooled to 170 ℃ at the speed of 3.5 ℃/min, kept for 7.5min, finally cooled to room temperature at the speed of 2 ℃/min, the preparation of the coordination modifier is carried out without stirring uniformly in a potassium permanganate solution with the mass fraction of 5% which is 2.5 times that of diatomite, then washed and dried, and then stirred uniformly in a hydrochloric acid solution with the mass fraction of 2% which is 4 times that of diatomite, and then washed and dried, wherein chitosan solution, sodium lignin sulfonate and phosphoric acid buffer solution are not added in the preparation of the coordination modifier, so that the performance of the product is deteriorated, and only the coordination modifier prepared by the method of the invention is matched with the nano silicon dioxide treatment liquid for treatment, and the performance effect of the product is most remarkable;
based on the above test, the invention finds that the whisker regulator has a larger trend of influencing the performance of the product, and based on the trend, the invention further explores the whisker regulator.
The preparation method of the whisker regulator comprises the following steps:
Placing the calcium sulfate whisker into a lanthanum chloride solution with the total amount of 4 times of the calcium sulfate whisker, uniformly stirring, and then carrying out suction filtration and drying to obtain a lanthanum-treated calcium sulfate whisker agent;
4 parts of lanthanum-treated calcium sulfate whisker agent, 6 parts of sodium silicate solution, 2 parts of sodium carboxymethylcellulose and 0.40 part of stearic acid, mixing and ball milling treatment, wherein the ball milling rotation speed is 1250r/min, ball milling is carried out for 1.5 hours, and the whisker regulator is obtained after ball milling; the mass fraction of the lanthanum chloride solution is 4%; the mass fraction of the sodium silicate solution was 12.5%.
Experimental example 1.
Except that the whisker conditioner was prepared without treatment with lanthanum chloride solution, as in example 3.
Experimental example 2.
The only difference from example 3 is that sodium carboxymethylcellulose and stearic acid were not added in the preparation of whisker regulator.
Experimental example 3.
The only difference from example 3 is that the sodium silicate solution is replaced with deionized water.
Experimental example 4.
The same as in example 3, except that the calcium sulfate whisker was replaced with an aluminum borate whisker.
From experimental examples 1-4, the preparation of the whisker regulator does not adopt lanthanum chloride solution treatment, the product performance change trend is the greatest, the lanthanum chloride solution treatment plays a leading role in the preparation of the whisker regulator, sodium carboxymethyl cellulose, stearic acid and sodium silicate solution are not added in the preparation of the whisker regulator, deionized water is adopted to replace the whisker regulator, calcium sulfate whisker is adopted to replace the whisker, and the product performance all has a variation trend;
The calcium sulfate whisker is replaced by aluminum borate whisker, the performance of the product is prone to deterioration, different raw materials are used for replacement, and the performance of the product is prone to deterioration, so that the preparation of the whisker regulator only adopts the raw material proportion and the preparation process of the invention, the performance effect of the product is best, and the effect of the invention cannot be achieved by adopting other raw materials for matching.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. The antibacterial mildew-proof polypropylene edible fungus bag film is characterized by comprising the following raw materials in parts by weight:
25-30 parts of linear low-density polyethylene, 15-20 parts of polypropylene, 8-12 parts of nano silver, 6-10 parts of nano calcium carbonate, 15-20 parts of nano silicon dioxide treatment fluid and 7-11 parts of coordination modifier; the preparation method of the nano silicon dioxide treatment fluid comprises the following steps:
S01: heat treating nanometer silicon dioxide at 150-170deg.C for 5-10min, heating to 255-265deg.C at 2-5deg.C/min, maintaining for 2-5min, cooling to 55deg.C at 1-3deg.C/min, and maintaining;
S02: adding 3-5 parts of sodium dodecyl benzene sulfonate and 1-3 parts of silane coupling agent KH560 into 10-15 parts of ethanol solvent, then adding 2-4 parts of sodium citrate solution and 1-2 parts of yttrium nitrate solution, and stirring and mixing uniformly to obtain treating agent liquid;
s03: mixing the nano silicon dioxide treated by the S01 and the whisker regulator according to the weight ratio of 1:3, performing ultrasonic treatment, washing and drying to obtain the whisker-regulated nano silicon dioxide;
s04: uniformly mixing the whisker-regulated nano silicon dioxide agent and the treating agent liquid according to the weight ratio of 2:5 to obtain nano silicon dioxide treating liquid;
The preparation method of the whisker regulator comprises the following steps:
Placing the calcium sulfate whisker into a lanthanum chloride solution with the total amount of 3-5 times of the calcium sulfate whisker, uniformly stirring, and then carrying out suction filtration and drying to obtain a lanthanum-treated calcium sulfate whisker agent;
3-5 parts of lanthanum-treated calcium sulfate whisker agent, 5-7 parts of sodium silicate solution, 1-3 parts of sodium carboxymethyl cellulose and 0.35-0.45 part of stearic acid, mixing and ball milling treatment, wherein the ball milling rotating speed is 1000-1500r/min, ball milling is carried out for 1-2 hours, and the whisker regulator is obtained after ball milling;
The preparation method of the coordination modifier comprises the following steps:
S101: placing diatomite into a potassium permanganate solution with the mass fraction of 5% which is 2-3 times of that of the diatomite, uniformly stirring, washing with water, drying, uniformly stirring in a hydrochloric acid solution with the mass fraction of 2% which is 3-5 times of that of the diatomite, washing with water, and drying;
The dried diatomite is sent to 310-320 ℃ for heat treatment for 10-15min, then cooled to 165-175 ℃ at the speed of 2-5 ℃/min, kept for 5-10min, and finally cooled to room temperature at the speed of 1-3 ℃/min;
s102: 10-15 parts of diatomite treated by S101, 30-35 parts of deionized water, 2-5 parts of chitosan solution with mass fraction of 5%, 1-3 parts of sodium lignin sulfonate and 1-2 parts of phosphoric acid buffer solution are stirred and mixed uniformly, and finally the mixture is washed with water and dried to obtain the coordination modifier.
2. The antibacterial and mildewproof polypropylene edible fungus bag film as claimed in claim 1, wherein the linear low density polyethylene has a melt index of 1-2g/10min; the melt index of the polypropylene is 0.5-1.5g/10min; the grain diameter of the nano calcium carbonate is 50-60nm; the grain diameter of the nano silver is 20-30nm.
3. The antibacterial and mildew-proof polypropylene edible fungus bag film according to claim 1, wherein the mass fraction of the yttrium nitrate solution is 4-7%; the mass fraction of the sodium citrate solution is 10-15%.
4. The antibacterial and mildew-proof polypropylene edible fungus bag film according to claim 1, wherein the ultrasonic power of the mixed ultrasonic treatment is 350-400W, and the treatment time is 1-2h.
5. The antibacterial and mildew-proof polypropylene edible fungus bag film according to claim 1, wherein the lanthanum chloride solution is 3-5% by mass; the mass fraction of the sodium silicate solution is 10-15%.
6. The antibacterial and mildewproof polypropylene edible fungus bag film as claimed in claim 1, wherein the pH value of the phosphoric acid buffer solution is 5.0.
7. A method for preparing the antibacterial and mildew-proof polypropylene edible fungus bag film according to any one of claims 1 to 6, which comprises the following steps:
stirring and mixing nano silver, nano calcium carbonate, a coordination modifier and nano silicon dioxide treatment liquid uniformly, washing with water, drying, fully mixing with linear low density polyethylene and polypropylene, extruding and granulating in a double-screw extruder at 190-200 ℃, and then blowing a film for forming, wherein a film blowing machine is adopted for blowing a film, and the length-diameter ratio of a screw is 30:1; the film blowing temperature is 160-180 ℃, and the film blowing is finished to obtain the edible fungi bag film.
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| CN111363245A (en) * | 2020-04-26 | 2020-07-03 | 江门市瑞祥复合材料研究院有限公司 | Waterproof and breathable polypropylene composite material and preparation method and application thereof |
| CN116462976A (en) * | 2023-06-09 | 2023-07-21 | 广州市瑞合新材料科技有限公司 | Food-grade antibacterial silicone rubber and preparation method thereof |
| CN116675930A (en) * | 2023-08-04 | 2023-09-01 | 苏州亚通生物医疗科技有限公司 | Polypropylene material for PCR (polymerase chain reaction) plate and preparation method thereof |
| CN116751573A (en) * | 2023-08-21 | 2023-09-15 | 大庆科讯油田技术服务有限公司 | Petroleum nanometer blocking remover and preparation method thereof |
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