CN111073115A - Preparation method of efficient mildew-proof and bacteria-proof polyethylene film - Google Patents
Preparation method of efficient mildew-proof and bacteria-proof polyethylene film Download PDFInfo
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0024—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Glucans; (beta-1,3)-D-Glucans, e.g. paramylon, coriolan, sclerotan, pachyman, callose, scleroglucan, schizophyllan, laminaran, lentinan or curdlan; (beta-1,6)-D-Glucans, e.g. pustulan; (beta-1,4)-D-Glucans; (beta-1,3)(beta-1,4)-D-Glucans, e.g. lichenan; Derivatives thereof
- C08B37/0027—2-Acetamido-2-deoxy-beta-glucans; Derivatives thereof
- C08B37/003—Chitin, i.e. 2-acetamido-2-deoxy-(beta-1,4)-D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan, i.e. deacetylated product of chitin or (beta-1,4)-D-glucosamine; Derivatives thereof
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
- C08J7/16—Chemical modification with polymerisable compounds
- C08J7/18—Chemical modification with polymerisable compounds using wave energy or particle radiation
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- 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
- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
- C08J2405/08—Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
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- 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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
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- 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
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- 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
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- 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
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- 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
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- 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
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
Abstract
The invention discloses a preparation method of a high-efficiency mildew-proof and bacteria-proof polyethylene film, which comprises the steps of preparing a polyethylene plastic master batch antibacterial modifier, preparing antibacterial particles and mixing and blowing a film. The preparation method of the efficient mildew-proof and antibacterial polyethylene film is ingenious, the modifier, the antibacterial particles and the polyethylene plastic master batch are mixed and then extruded, granulated and blown to form the film, the double-layer antibacterial and mildew-proof effect is achieved, the breeding of mildew can be prevented, bacteria can be killed, the preservation effect on vegetables and fruits is outstanding, and the economic benefit is great.
Description
Technical Field
The invention belongs to the technical field of food packaging, and particularly relates to a preparation method of a high-efficiency mildew-proof and bacteria-proof polyethylene film.
Background
The plastic film is the most widely applied packaging material for fresh fruits and vegetables at present, and has wide application prospect due to the transparency, moisture retention, air permeability, good sealing property and low price. The mildew-proof preservative film can reduce or eliminate cross infection of microorganisms such as bacteria, mold and the like between people and objects, between people and between objects. The preservative film sold in the market is mainly made of PE (polyethylene), does not contain any plasticizer (polyethylene has good toughness), is generally accepted as the safest, and has good shock resistance and corrosion resistance. However, when the packaging material is used for packaging vegetables and fruits, food decay and deterioration are accelerated due to the infection of microorganisms, the food preservation difficulty is increased, or the potential safety hazard of food is caused by the pollution of pathogenic bacteria. In recent years, nanocomposites have been widely used in food packaging applications due to their advantages such as low moisture permeability and good barrier properties against carbon dioxide and oxygen.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of a high-efficiency mildew-proof and bacteria-proof polyethylene film.
The invention is realized by the following technical scheme:
the preparation method of the high-efficiency mildew-proof and bacteria-proof polyethylene film comprises the steps of preparing the polyethylene plastic master batch antibacterial modifier, preparing the antibacterial particles and mixing and blowing the film, and specifically comprises the following steps:
the method comprises the following steps: preparing a polyethylene plastic master batch antibacterial modifier: (1) mixing and stirring chitosan, potassium hydroxide and isopropanol, heating to 45-55 ℃, and performing microwave alkalization for 1-1.2 h to obtain chitosan liquid; the mass ratio of the chitosan to the potassium hydroxide to the isopropanol is 4: 5: 7; (2) dropwise adding bromoethane into the chitosan liquid to react for 5-6 h to obtain a reaction liquid A; (3) adding methanol into the reaction solution, uniformly mixing to obtain a reaction solution B, adjusting the pH value of the reaction solution B to 7 by using a 0.015 mol/L hydrochloric acid solution to obtain a reaction solution C, and adding acetone into the reaction solution C to obtain a reaction solution D; (4) standing the reaction solution D for 1.2-1. h, precipitating, filtering to obtain filter residue, washing the filter residue with acetone and diethyl ether for multiple times, and drying to obtain alkylated chitosan; (5) mixing alkylated chitosan, nano titanium dioxide, a coupling agent and deionized water, carrying out ultrasonic treatment for 1.5-2.5 hours to obtain a mixed solution, filtering the mixed solution, and drying filter residues to obtain a modifier;
step two: preparing antibacterial particles: preparing a silver ammonia solution: weighing silver nitrate, dissolving the silver nitrate in ultrapure water, and uniformly stirring to prepare a silver nitrate solution with the concentration of 2.10-2.15 mg/ml; taking a certain amount of silver nitrate solution according to the volume ratio of 1:8, adding ultrapure water to dilute into solution, and dropwise adding ammonia water to obtain 190ppm silver-ammonia solution; (2) adding SiO2 nanopowder into the obtained silver ammonia solution, and placing in an oscillator for oscillation for 0.5-1.2 h; wherein the mass-to-volume ratio of the SiO2 nanopowder to the silver ammonia solution is 0.085:52 (g/mL); (3) centrifuging after the oscillation is finished and the material is taken out; after the centrifugation is finished, taking out the precipitate and drying to obtain antibacterial particles;
step three: and (3) mixed film blowing: uniformly mixing the modifier prepared in the step one, the antibacterial particles prepared in the step two, attapulgite, polyethylene plastic master batch and a coupling agent, and then mixing and granulating by a double-screw extruder; and (3) blowing a film by a film blowing machine after granulation at the film blowing temperature of 150-160 ℃ to obtain the high-efficiency mildew-proof and bacteria-proof polyethylene film, wherein the mass ratio of the modifier to the antibacterial particles to the attapulgite to the polyethylene plastic master batch to the coupling agent is 10: 8: 5:50:2.
Preferably, acrylic acid, benzophenone and deionized water are uniformly mixed to obtain a modified solution; and (3) putting the film prepared in the third step into the modifying liquid, irradiating the film for 30min by using ultraviolet rays, taking out the film, and drying the film to obtain the efficient mildew-proof and bacteria-proof polyethylene film with the antifogging function. The reason is that after acrylic acid is grafted by ultraviolet light, the surface of the film becomes rough, the hydrophilicity of the film is improved, and moisture in the environment forms a layer of uniform water film on the surface of the preservative film, so that the transmittance of light is ensured, the appearance is not influenced, the moisture is not condensed into liquid drops to fall onto a substance to be preserved, the substance to be preserved is wetted to cause bacteria breeding, the antifogging capability is realized, and the preservation effect is also improved.
Preferably, in step three, the coupling agent is ethylene bisstearamide.
Preferably, in the third step, the screw extrusion conditions are adjusted as follows: the rotation speed of the screw is 80-100r/min, and the temperatures of all sections of the extruder are respectively set to be 110-.
The invention has the beneficial effects that:
the preparation method of the efficient mildew-proof and antibacterial polyethylene film is ingenious, the modifier, the antibacterial particles and the polyethylene plastic master batch are mixed and then extruded, granulated and blown to form the film, the double-layer antibacterial and mildew-proof effect is achieved, the breeding of mildew can be prevented and bacteria can be killed, the preservation effect on vegetables and fruits is remarkable, the economic benefit is great, and the preparation method particularly has the following advantages:
1. in the modifier, after the chitosan is subjected to alkylation treatment, the chitosan has a hydrophilic main chain and a hydrophobic branched chain at the same time, and is aggregated into a microsphere form with hydrophilic outside and hydrophobic inside in water, so that the adhesive microspheres can load nano titanium dioxide to form a microsphere structure with nano titanium dioxide as a core and chitosan as an outer net; the chitosan has an antibacterial effect, and the coated nano titanium dioxide can decompose pollutants through photocatalysis and kill microorganisms to prevent the film from being infected by mould;
2. the film added with the antibacterial particles has better antibacterial property and more obvious inhibition effect on mould, and the physical property, the mechanical property, the air permeability, the moisture permeability and the stability of the film are also greatly improved.
Detailed Description
The preparation method of the high-efficiency mildew-proof and bacteria-proof polyethylene film comprises the steps of preparing a polyethylene plastic master batch antibacterial modifier, preparing antibacterial particles and mixing and blowing the film, and specifically comprises the following steps:
the method comprises the following steps: preparing a polyethylene plastic master batch antibacterial modifier: (1) mixing and stirring chitosan, potassium hydroxide and isopropanol, heating to 45-55 ℃, and performing microwave alkalization for 1-1.2 h to obtain chitosan liquid; the mass ratio of the chitosan to the potassium hydroxide to the isopropanol is 4: 5: 7; (2) dropwise adding bromoethane into the chitosan liquid to react for 5-6 h to obtain a reaction liquid A; (3) adding methanol into the reaction solution, uniformly mixing to obtain a reaction solution B, adjusting the pH value of the reaction solution B to 7 by using a 0.015 mol/L hydrochloric acid solution to obtain a reaction solution C, and adding acetone into the reaction solution C to obtain a reaction solution D; (4) standing the reaction solution D for 1.2-1. h, precipitating, filtering to obtain filter residue, washing the filter residue with acetone and diethyl ether for multiple times, and drying to obtain alkylated chitosan; (5) mixing alkylated chitosan, nano titanium dioxide, a coupling agent and deionized water, carrying out ultrasonic treatment for 1.5-2.5 hours to obtain a mixed solution, filtering the mixed solution, and drying filter residues to obtain a modifier;
step two: preparing antibacterial particles: preparing a silver ammonia solution: weighing silver nitrate, dissolving the silver nitrate in ultrapure water, and uniformly stirring to prepare a silver nitrate solution with the concentration of 2.10-2.15 mg/ml; taking a certain amount of silver nitrate solution according to the volume ratio of 1:8, adding ultrapure water to dilute into solution, and dropwise adding ammonia water to obtain 190ppm silver-ammonia solution; (2) adding SiO2 nanopowder into the obtained silver ammonia solution, and placing in an oscillator for oscillation for 0.5-1.2 h; wherein the mass-to-volume ratio of the SiO2 nanopowder to the silver ammonia solution is 0.085:52 (g/mL); (3) centrifuging after the oscillation is finished and the material is taken out; after the centrifugation is finished, taking out the precipitate and drying to obtain antibacterial particles;
step three: and (3) mixed film blowing: uniformly mixing the modifier prepared in the step one, the antibacterial particles prepared in the step two, attapulgite, polyethylene plastic master batch and a coupling agent, and then mixing and granulating by a double-screw extruder; and (3) blowing a film by a film blowing machine after granulation at the film blowing temperature of 150-160 ℃ to obtain the high-efficiency mildew-proof and bacteria-proof polyethylene film, wherein the mass ratio of the modifier to the antibacterial particles to the attapulgite to the polyethylene plastic master batch to the coupling agent is 10: 8: 5:50:2.
Uniformly mixing acrylic acid, benzophenone and deionized water to obtain a modified solution; and (3) putting the film prepared in the third step into the modifying liquid, irradiating the film for 30min by using ultraviolet rays, taking out the film, and drying the film to obtain the efficient mildew-proof and bacteria-proof polyethylene film with the antifogging function. The reason is that after acrylic acid is grafted by ultraviolet light, the surface of the film becomes rough, the hydrophilicity of the film is improved, and moisture in the environment forms a layer of uniform water film on the surface of the preservative film, so that the transmittance of light is ensured, the appearance is not influenced, the moisture is not condensed into liquid drops to fall onto a substance to be preserved, the substance to be preserved is wetted to cause bacteria breeding, the antifogging capability is realized, and the preservation effect is also improved.
In the third step, the coupling agent is ethylene bis stearamide.
In the third step, the extrusion conditions of the adjusting screw are as follows: the rotation speed of the screw is 80-100r/min, and the temperatures of all sections of the extruder are respectively set to be 110-.
The preparation method of the efficient mildew-proof and antibacterial polyethylene film is ingenious, the modifier, the antibacterial particles and the polyethylene plastic master batch are mixed and then extruded, granulated and blown to form the film, the double-layer antibacterial and mildew-proof effect is achieved, the breeding of mildew can be prevented and bacteria can be killed, the preservation effect on vegetables and fruits is remarkable, the economic benefit is great, and the preparation method particularly has the following advantages:
1. in the modifier, after the chitosan is subjected to alkylation treatment, the chitosan has a hydrophilic main chain and a hydrophobic branched chain at the same time, and is aggregated into a microsphere form with hydrophilic outside and hydrophobic inside in water, so that the adhesive microspheres can load nano titanium dioxide to form a microsphere structure with nano titanium dioxide as a core and chitosan as an outer net; the chitosan has an antibacterial effect, and the coated nano titanium dioxide can decompose pollutants through photocatalysis and kill microorganisms to prevent the film from being infected by mould;
2. the film added with the antibacterial particles has better antibacterial property and more obvious inhibition effect on mould, and the physical property, the mechanical property, the air permeability, the moisture permeability and the stability of the film are also greatly improved.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (4)
1. The preparation method of the high-efficiency mildew-proof and bacteria-proof polyethylene film is characterized by comprising the steps of preparing a polyethylene plastic master batch antibacterial modifier, preparing antibacterial particles and mixing and blowing the film, and specifically comprises the following steps:
the method comprises the following steps: preparing a polyethylene plastic master batch antibacterial modifier: (1) mixing and stirring chitosan, potassium hydroxide and isopropanol, heating to 45-55 ℃, and performing microwave alkalization for 1-1.2 h to obtain chitosan liquid; the mass ratio of the chitosan to the potassium hydroxide to the isopropanol is 4: 5: 7; (2) dropwise adding bromoethane into the chitosan liquid to react for 5-6 h to obtain a reaction liquid A; (3) adding methanol into the reaction solution, uniformly mixing to obtain a reaction solution B, adjusting the pH value of the reaction solution B to 7 by using a 0.015 mol/L hydrochloric acid solution to obtain a reaction solution C, and adding acetone into the reaction solution C to obtain a reaction solution D; (4) standing the reaction solution D for 1.2-1. h, precipitating, filtering to obtain filter residue, washing the filter residue with acetone and diethyl ether for multiple times, and drying to obtain alkylated chitosan; (5) mixing alkylated chitosan, nano titanium dioxide, a coupling agent and deionized water, carrying out ultrasonic treatment for 1.5-2.5 hours to obtain a mixed solution, filtering the mixed solution, and drying filter residues to obtain a modifier;
step two: preparing antibacterial particles: preparing a silver ammonia solution: weighing silver nitrate, dissolving the silver nitrate in ultrapure water, and uniformly stirring to prepare a silver nitrate solution with the concentration of 2.10-2.15 mg/ml; taking a certain amount of silver nitrate solution according to the volume ratio of 1:8, adding ultrapure water to dilute into solution, and dropwise adding ammonia water to obtain 190ppm silver-ammonia solution; (2) adding SiO2 nanopowder into the obtained silver ammonia solution, and placing in an oscillator for oscillation for 0.5-1.2 h; wherein the mass-to-volume ratio of the SiO2 nanopowder to the silver ammonia solution is 0.085:52 (g/mL); (3) centrifuging after the oscillation is finished and the material is taken out; after the centrifugation is finished, taking out the precipitate and drying to obtain antibacterial particles;
step three: and (3) mixed film blowing: uniformly mixing the modifier prepared in the step one, the antibacterial particles prepared in the step two, attapulgite, polyethylene plastic master batch and a coupling agent, and then mixing and granulating by a double-screw extruder; and (3) blowing a film by a film blowing machine after granulation at the film blowing temperature of 150-160 ℃ to obtain the high-efficiency mildew-proof and bacteria-proof polyethylene film, wherein the mass ratio of the modifier to the antibacterial particles to the attapulgite to the polyethylene plastic master batch to the coupling agent is 10: 8: 5:50:2.
2. The preparation method of the high-efficiency mildew-proof and bacteria-proof polyethylene film as claimed in claim 1, wherein acrylic acid, benzophenone and deionized water are uniformly mixed to obtain a modified solution; and (3) putting the film prepared in the third step into the modifying liquid, irradiating the film for 30min by using ultraviolet rays, taking out the film, and drying the film to obtain the efficient mildew-proof and bacteria-proof polyethylene film with the antifogging function.
3. The method for preparing the high-efficiency mildew-proof and bacteria-proof polyethylene film as claimed in claim 1, wherein in the third step, the coupling agent is ethylene bisstearamide.
4. The preparation method of the high-efficiency mildew-proof and bacteria-proof polyethylene film as claimed in claim 1, wherein in the third step, the extrusion conditions of the adjusting screw are as follows: the rotation speed of the screw is 80-100r/min, and the temperatures of all sections of the extruder are respectively set to be 110-.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103044748A (en) * | 2012-12-17 | 2013-04-17 | 上海普利特复合材料股份有限公司 | Efficient antibacterial polyethylene film and production method thereof |
| CN105968489A (en) * | 2016-05-16 | 2016-09-28 | 汕头市虹桥包装实业有限公司 | Preparation method of polyethylene antimicrobial packaging film |
| CN106543540A (en) * | 2016-10-28 | 2017-03-29 | 南京财经大学 | A kind of SiO2Carry the preparation method of silver-colored anti-mildew fresh-keeping packaging bag |
| CN109181076A (en) * | 2018-09-20 | 2019-01-11 | 黄旭东 | A kind of preparation method of mould proof antifog polyethylene preservative film |
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2019
- 2019-12-31 CN CN201911409883.0A patent/CN111073115A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103044748A (en) * | 2012-12-17 | 2013-04-17 | 上海普利特复合材料股份有限公司 | Efficient antibacterial polyethylene film and production method thereof |
| CN105968489A (en) * | 2016-05-16 | 2016-09-28 | 汕头市虹桥包装实业有限公司 | Preparation method of polyethylene antimicrobial packaging film |
| CN106543540A (en) * | 2016-10-28 | 2017-03-29 | 南京财经大学 | A kind of SiO2Carry the preparation method of silver-colored anti-mildew fresh-keeping packaging bag |
| CN109181076A (en) * | 2018-09-20 | 2019-01-11 | 黄旭东 | A kind of preparation method of mould proof antifog polyethylene preservative film |
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Application publication date: 20200428 |