CN106800792B - Degradable antibacterial film based on corn husks and preparation method thereof - Google Patents
Degradable antibacterial film based on corn husks and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
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- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention relates to a degradable antibacterial film based on corn husks and a preparation method thereof, the degradable antibacterial film based on the corn husks is prepared by 4-9% of corn husk powder, 12-16% of sodium hydroxide, 3-5% of konjac glucomannan, 1.0-1.6% of chitosan, 7.0-9.0% of acetic acid, 2-4% of Arabic gum, 4-5% of allyl isothiocyanate and 10-15% of deionized water according to the mass-volume ratio, wherein the corn husk powder is 270-mesh corn husk powder; the degradable antibacterial film based on the corn bran has the film thickness of 60-140 um, the tensile strength of 35.9-46.7 MP, the elongation at break of 21.6-30 percent and the folding endurance of 20-26 times. According to the invention, the fine corn bran powder particles and the antibacterial substance are uniformly distributed in the material, so that the prepared packaging film has strong mechanical property and barrier property, and the film can be heated and sealed.
Description
One, the technical field
The invention relates to the technical field of packaging films, in particular to a degradable antibacterial film based on corn husks and a preparation method thereof.
Second, background Art
The packaging film is widely applied, but because the packaging film is generally not degradable, the packaging film is usually not applied for the second time after being disassembled from a package, but is discarded to form non-degradable garbage, thereby polluting the environment.
Corn is one of the main crops in China and is used as a main raw material in the starch industry. Corn husks are one of the major byproducts of corn starch processing, with a yield of about 20% of the corn feedstock. However, most of the corn husks are not fully utilized for a long time, and the corn husks are mainly used as livestock feed at present and have low economic value. Compared with other cereal husks, the corn husks contain abundant cellulose and hemicellulose, and also contain more starch, a certain amount of glucose, fat and protein and a small amount of B vitamins, so that the corn husks are a good dietary fiber source. The existing research shows that the corn bran active polysaccharide has obvious functions of reducing blood sugar, losing weight and blood fat and resisting constipation, and can also be used as an auxiliary means for treating colon cancer. However, it is difficult to show the physiological activity of the active polysaccharide component of corn bran before biological, chemical and physical processing, which has been confirmed by foreign research. The degradable antibacterial film prepared by taking corn husks as a matrix material has no literature and patent report.
Third, the invention
An object of the present invention is to provide a degradable antibacterial film based on corn husks, which is used to solve the problems of environmental pollution caused by the difficulty in degradation of plastic packaging films and composite packaging films in the prior art and to improve the added value of corn husks, and another object of the present invention is to provide a method for preparing the degradable antibacterial film based on corn husks.
In order to achieve the purpose, the invention adopts the following specific technical scheme: the degradable antibacterial film based on the corn husks is prepared from 4-8% of corn husk powder, 12-16% of sodium hydroxide, 3-5% of konjac glucomannan, 1.0-1.6% of chitosan, 7.0-9.0% of acetic acid, 2-4% of Arabic gum, 4-5% of allyl isothiocyanate and 10-15% of deionized water in percentage by mass and volume, wherein the corn husks are 270-mesh corn husk powder; the degradable antibacterial film based on the corn bran has the advantages of 68-136 um of film thickness, 35.9-46.7 MP of tensile strength, 21.6-28.6 percent of elongation at break and 20-26 times of folding endurance.
The preparation method of the degradable antibacterial film based on the corn husks comprises the following steps:
step one, selecting corn husks without mildew or worm damage, soaking the corn husks in deionized water for 24 hours, and then drying the corn husks in an electrothermal blowing drying oven at 70 ℃ for 20 minutes;
step two, crushing the dried corn bran into 270-mesh corn bran powder, and preparing according to the mass-volume ratio: 4-8% of corn husk powder, 12-16% of sodium hydroxide, 3-5% of konjac glucomannan, 1.0-1.6% of chitosan, 7.0-9.0% of acetic acid, 2-4% of acacia gum, 4-5% of allyl isothiocyanate and 10-15% of deionized water;
step three, according to the mixture ratio in the step two: adding the corn bran powder into a 12-16% sodium hydroxide solution, stirring for 12-18 minutes, adding 1.0-1.6% chitosan into 7.0-9.0% acetic acid, stirring in a magnetic stirrer until the chitosan is completely dissolved, adding the mixture into a mixed solution of the corn bran powder and the sodium hydroxide, adding 3-5% konjac glucomannan and 2-4% Arabic gum, stirring in a water bath kettle at the temperature of 40-50 ℃ for 40-50 minutes until the konjac glucomannan and the Arabic gum are uniformly mixed, adding 4-5% allyl isothiocyanate while stirring, and cooling;
step four, homogenizing under high pressure at 20-26 ℃ and under 115-125 MPa under 3 circulation conditions;
and step five, casting the film on a PC board to form a film, horizontally placing the film in an electrothermal blowing drying oven for drying, wherein the drying time is 180-300 min, the temperature is 40-60 ℃, and then cooling to room temperature to remove the film from the PC board, so as to obtain the degradable antibacterial film based on the corn husks.
Has the advantages that:
1. the invention takes corn bran as a main raw material and is assisted by various auxiliary agents to prepare the degradable antibacterial film of the corn bran. The high-pressure homogenization technology is applied to the film preparation process, so that the corn husk powder fine particles and the antibacterial substances are uniformly distributed in the material, the prepared packaging film has strong mechanical property and barrier property, and the film can be heated and sealed.
2. The raw materials used by the invention are all green packaging materials, do not cause pollution to the environment, and simultaneously have antibacterial property and degradability.
3. The invention greatly improves the economic value and the added value of the corn bran, and the film preparation method is simple, has low cost and is suitable for large-scale production.
Fourth, detailed description of the invention
The invention is further illustrated below:
example 1:
the degradable antibacterial film based on the corn husks is prepared from 4% of corn husk powder, 12% of sodium hydroxide, 3% of konjac glucomannan, 1.0% of chitosan, 7.0% of acetic acid, 2% of acacia, 4% of allyl isothiocyanate and 10% of deionized water in percentage by mass and volume, wherein the corn husk powder is 270-mesh corn husk powder. The mass-volume ratio is the ratio of all the component volumes of the mass of a certain component, and the all the component volumes are the total volumes of the corn husk powder, the sodium hydroxide, the konjac glucomannan, the chitosan, the acetic acid, the Arabic gum, the allyl isothiocyanate and the deionized water, for example, the mass-volume ratio of the corn husk powder is the ratio of the mass of the corn husk powder to the total volume, and the following is the same.
The preparation method of the degradable antibacterial film based on the corn husks comprises the following steps:
(1) selecting corn husks without mildew or worm damage, soaking the corn husks in deionized water for 24 hours, and then drying the corn husks in an electrothermal blowing drying oven at 70 ℃ for 20 minutes;
(2) crushing the dried corn bran into corn bran powder;
(3) adding 4% (w/v) of corn bran powder into 12% (w/v) of sodium hydroxide solution, stirring for 12 minutes, adding 1.0% (w/v) of chitosan into 7.0% (w/v) of acetic acid, stirring in a magnetic stirrer until the chitosan is completely dissolved, adding the mixture into a mixed solution of the corn bran powder and the sodium hydroxide, adding 3% (w/v) of konjac gum and 2% (w/v) of arabic gum, stirring for 40 minutes in a water bath kettle at 40 ℃ until the mixture is uniform, adding 4% (w/v) of allyl isothiocyanate while stirring, and cooling;
(4) homogenizing under high pressure at 20 deg.C under 115MPa for 3 cycles;
(5) casting the mixture on a PC board to form a film, horizontally placing the film in an electrothermal blowing dry box for drying (the time is 180min and the temperature is 60 ℃), and cooling the film to room temperature to remove the film from the PC board.
The obtained film has the thickness of 68 mu m, the tensile strength of 35.9MP, the elongation at break of 21.6 percent and the folding endurance of 26 times, has excellent degradability when the weight loss rate reaches about 90 percent in a soil burying degradation test after 90 days, and has heat sealability and good antibacterial performance.
Example 2:
the degradable antibacterial film based on the corn husks is prepared from 6% of corn husk powder, 14% of sodium hydroxide, 4% of konjac glucomannan, 1.3% of chitosan, 8.0% of acetic acid, 3% of acacia, 4.5% of allyl isothiocyanate and 12% of deionized water in percentage by mass and volume, wherein the corn husk powder is 270-mesh corn husk powder.
The preparation method of the degradable antibacterial film based on the corn husks comprises the following steps:
(1) selecting corn husks without mildew or worm damage, soaking the corn husks in deionized water for 24 hours, and drying the corn husks in an electrothermal blowing drying oven at 80 ℃ for 18 minutes;
(2) crushing the dried corn bran into corn bran powder;
(3) adding 6% (w/v) of corn bran powder into 14% (w/v) of sodium hydroxide solution, stirring for 15 minutes, adding 1.3% (w/v) of chitosan into 8% (w/v) of acetic acid, stirring in a magnetic stirrer until the chitosan is completely dissolved, adding the mixture into a mixed solution of the corn bran powder and the sodium hydroxide, adding 4% (w/v) of konjac glucomannan and 3% (w/v) of Arabic gum, stirring for 50 minutes in a water bath kettle at 45 ℃ until the konjac glucomannan and the Arabic gum are uniformly mixed, adding 4.5% (w/v) of allyl isothiocyanate while stirring, and cooling;
(4) homogenizing under high pressure at 23 deg.C under 120MPa for 3 cycles;
(5) casting the mixture on a PC board to form a film, horizontally placing the film in an electrothermal blowing dry box for drying (the time is 240min and the temperature is 50 ℃), and cooling the film to room temperature to remove the film from the PC board.
The obtained film has the thickness of 95 mu m, the tensile strength of 40.2MP, the elongation at break of 23.4 percent and the folding endurance of 22 times, has excellent degradability when the weight loss rate reaches about 90 percent in a soil burying degradation test after 90 days, and has heat sealability and good antibacterial performance.
Example 3:
the degradable antibacterial film based on the corn husks is prepared from 8% of corn husk powder, 16% of sodium hydroxide, 5% of konjac glucomannan, 1.6% of chitosan, 9.0% of acetic acid, 4% of Arabic gum, 5% of allyl isothiocyanate and 15% of deionized water in a mass-volume ratio, wherein the corn husk powder is 270-mesh corn husk powder.
The preparation method of the degradable antibacterial film based on the corn husks comprises the following steps:
(1) selecting corn husks without mildew or worm damage, soaking the corn husks in deionized water for 24 hours, and then drying the corn husks in an electrothermal blowing drying oven at 90 ℃ for 16 minutes;
(2) crushing the dried corn bran into corn bran powder;
(3) adding 8% (w/v) of corn bran powder into 16% (w/v) of sodium hydroxide solution, stirring for 18 minutes, adding 1.6% (w/v) of chitosan into 9.0% (w/v) of acetic acid, stirring in a magnetic stirrer until the chitosan is completely dissolved, adding the mixture into a mixed solution of the corn bran powder and the sodium hydroxide, adding 5% (w/v) of konjac gum and 4% (w/v) of Arabic gum, stirring in a water bath kettle at 50 ℃ for 40 minutes until the mixture is uniform, adding 5% (w/v) of allyl isothiocyanate while stirring, and cooling;
(4) homogenizing under high pressure at 26 deg.C under 125MPa for 3 cycles;
(5) casting the mixture on a PC board to form a film, horizontally placing the film in an electrothermal blowing dry box for drying (the time is 300min, the temperature is 40 ℃), and cooling the film to room temperature to remove the film from the PC board.
The obtained film has the thickness of 136 mu m, the tensile strength of 46.7MP, the elongation at break of 28.6 percent and the folding endurance of 20 times, has excellent degradability when the weight loss rate reaches about 90 percent in a soil burying degradation test after 90 days, and has heat sealability and good antibacterial performance.
The corn bran degradable film provided by the invention can be completely degraded in a natural environment after being discarded, has no pollution and harm to the environment, reduces the application proportion of plastic packaging materials, plays a role in restraining and reducing white pollution, can replace part of paper product packaging, saves a large amount of forest resources, reduces the consumption of non-renewable energy sources, and avoids the pollution harm of industrial wastewater generated by papermaking to the environment.
Claims (1)
1. A degradable antibacterial film based on corn husks is characterized in that: the degradable antibacterial film based on the corn husks is prepared from 4-8% of corn husk powder, 12-16% of sodium hydroxide, 3-5% of konjac glucomannan, 1.0-1.6% of chitosan, 7.0-9.0% of acetic acid, 2-4% of Arabic gum, 4-5% of allyl isothiocyanate and 10-15% of deionized water in a mass-volume ratio, wherein the corn husk powder is 270-mesh corn husk powder; the degradable antibacterial film based on the corn bran has the thickness of 68-136 um, the tensile strength of 35.9-46.7 MP, the elongation at break of 21.6-28.6 percent and the folding endurance of 20-26 times;
the preparation method of the degradable antibacterial film based on the corn bran comprises the following steps:
step one, selecting corn husks without mildew or worm damage, soaking the corn husks in deionized water for 24 hours, and then drying the corn husks in an electrothermal blowing drying oven at 70 ℃ for 20 minutes;
step two, crushing the dried corn bran into 270-mesh corn bran powder, and preparing according to the mass-volume ratio: 4-8% of corn husk powder, 12-16% of sodium hydroxide, 3-5% of konjac glucomannan, 1.0-1.6% of chitosan, 7.0-9.0% of acetic acid, 2-4% of acacia gum, 4-5% of allyl isothiocyanate and 10-15% of deionized water;
step three, according to the mixture ratio in the step two: adding the corn bran powder into a 12-16% sodium hydroxide solution, stirring for 12-18 minutes, adding 1.0-1.6% chitosan into 7.0-9.0% acetic acid, stirring in a magnetic stirrer until the chitosan is completely dissolved, adding the mixture into a mixed solution of the corn bran powder and the sodium hydroxide, adding 3-5% konjac glucomannan and 2-4% Arabic gum, stirring in a water bath kettle at the temperature of 40-50 ℃ for 40-50 minutes until the konjac glucomannan and the Arabic gum are uniformly mixed, adding 4-5% allyl isothiocyanate while stirring, and cooling;
step four, homogenizing under high pressure at 20-26 ℃ and under 115-125 MPa under 3 circulation conditions;
and step five, casting the film on a PC board to form a film, horizontally placing the film in an electrothermal blowing drying oven for drying, wherein the drying time is 180-300 min, the temperature is 40-60 ℃, and then cooling to room temperature to remove the film from the PC board, so as to obtain the degradable antibacterial film based on the corn husks.
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CN110272558A (en) * | 2019-06-28 | 2019-09-24 | 武汉龙顺达新材料有限公司 | A kind of Modified Membrane cloth and preparation method thereof |
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WO2006118109A1 (en) * | 2005-04-27 | 2006-11-09 | Nihon University | Polysaccharide composite material |
CN102504350A (en) * | 2011-10-11 | 2012-06-20 | 福建农林大学 | Degradable food packaging paper and preparation method thereof |
CN102775647A (en) * | 2012-07-30 | 2012-11-14 | 昆明理工大学 | Preparation method of hemicellulose based edible film |
CN105968405A (en) * | 2016-05-30 | 2016-09-28 | 天津工业大学 | Antimicrobial moisturizing degradable porous gel preservative film and preparation method and application thereof |
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WO2006118109A1 (en) * | 2005-04-27 | 2006-11-09 | Nihon University | Polysaccharide composite material |
CN102504350A (en) * | 2011-10-11 | 2012-06-20 | 福建农林大学 | Degradable food packaging paper and preparation method thereof |
CN102775647A (en) * | 2012-07-30 | 2012-11-14 | 昆明理工大学 | Preparation method of hemicellulose based edible film |
CN105968405A (en) * | 2016-05-30 | 2016-09-28 | 天津工业大学 | Antimicrobial moisturizing degradable porous gel preservative film and preparation method and application thereof |
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