CN109734939B - Method for preparing food-grade polylactic acid film by dissolving glacial acetic acid - Google Patents
Method for preparing food-grade polylactic acid film by dissolving glacial acetic acid Download PDFInfo
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- CN109734939B CN109734939B CN201910050853.9A CN201910050853A CN109734939B CN 109734939 B CN109734939 B CN 109734939B CN 201910050853 A CN201910050853 A CN 201910050853A CN 109734939 B CN109734939 B CN 109734939B
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- polylactic acid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/90—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in food processing or handling, e.g. food conservation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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Abstract
The invention discloses a method for preparing a food-grade polylactic acid film by dissolving glacial acetic acid. The method has simple film making process, the prepared polylactic acid film belongs to food grade, not only has good toughness and degradability, but also has good gas permeability, can be used as a fresh-keeping packaging material and used for prolonging the storage life of foods such as chilled meat, fruits and vegetables, and the toughness of the polylactic acid film is superior to that of the existing fresh-keeping film.
Description
Technical Field
The invention relates to a method for preparing a degradable polylactic acid film, in particular to a method for preparing a food-grade polylactic acid film by dissolving glacial acetic acid.
Background
Polylactic acid (PLA) film is a novel biodegradable material, has the basic characteristics of biodegradable plastics, can be safely disposed of after use, does not produce any harmful substance, has high film-forming properties, high transparency and high water vapor permeability compared to Polyethylene (PE) film, and has a wide range of raw material sources. In addition, PLA films also have the same printing properties as traditional film materials.
At present, a PLA film is mainly formed by adopting a solid or semi-solid material through modes of extrusion, stretching, blow molding and the like, and a forming medium does not have fluidity, so that the film forming process is complex, and therefore, a preparation method of a food-grade polylactic acid film which is simple in film forming process and has good toughness and degradability is needed to be provided.
Disclosure of Invention
The invention aims to provide a method for preparing a food-grade polylactic acid film by dissolving with glacial acetic acid, which has simple film preparation process and good toughness.
The invention provides a method for preparing a food-grade polylactic acid film by dissolving glacial acetic acid, which comprises the following steps:
(1) mixing: mixing polylactic acid particles and glacial acetic acid in proportion, and stirring while mixing to obtain a mixed solution;
(2) hot melting: placing the mixed solution at a constant temperature of 40-60 ℃ to shake and dissolve the mixed solution, so that the polylactic acid is completely dissolved to obtain a dissolved solution;
(3) film forming: heating a glass plate or a stainless steel plate with a smooth surface, keeping for a certain time, pouring the solution on the glass plate or the stainless steel plate, and uniformly coating;
(4) forming: after the polylactic acid on the glass plate or the stainless steel plate is formed into a film and dried, separating the polylactic acid film from the glass plate or the stainless steel plate;
(5) and (3) drying: and naturally airing the separated polylactic acid film to obtain the polylactic acid film.
Further, the purity of the glacial acetic acid in the step (1) is 99.5%, the polylactic acid particles and the glacial acetic acid with the purity of 99.5% are mixed according to the proportion that 15-30 ml of glacial acetic acid is added into 1 g of polylactic acid particles, the mixing and stirring time is 1-5 min, and the polylactic acid particles adopt 4032D polylactic acid particles produced by Nature Works in the United states.
Further, the shaking and dissolving time in the step (2) is 10-30 min.
Further, an antibacterial component is also added into the mixed solution in the step (2), and the antibacterial component is tea polyphenol or natamycin.
Further, in the step (3), the glass plate or the stainless steel plate is heated to 25-40 ℃, an anti-adhesive film is coated on the glass plate or the stainless steel plate, and then the solution is poured on the glass plate or the stainless steel plate.
Further, the step (4) of separating the polylactic acid film from the glass plate or the stainless steel plate means that the polylactic acid film is torn from the glass plate or the stainless steel plate after the glass plate or the stainless steel plate is soaked in water.
The invention also provides the food-grade polylactic acid film prepared by the method.
The invention utilizes a polar organic solvent glacial acetic acid to dissolve polylactic acid particles to prepare a film, and the polylactic acid particles are formed by polymerizing lactic acid molecules and have the same structure with carbonyloxy in the glacial acetic acid molecules. When glacial acetic acid is mixed with polylactic acid particles, the glacial acetic acid will dissolve the polylactic acid particles into a solution to have fluidity according to a similar compatibility principle. Because the glacial acetic acid molecules have volatility and can volatilize at a certain temperature, the polylactic acid molecules are re-aggregated to form a film after the glacial acetic acid is volatilized. The glacial acetic acid is food grade, no acetic acid residue is left after the polylactic acid is formed into a film, and other harmful substances such as a plasticizer, a lubricant and the like are not added in the film forming process, so that the prepared polylactic acid film has good food safety, can be directly contacted with food, and does not generate residues of the plasticizer, the lubricant and the like.
The film preparation process is simple, the prepared polylactic acid film belongs to food grade, not only has good toughness and degradability, but also has good gas permeability, can be used as a fresh-keeping packaging material and used for prolonging the storage life of foods such as chilled meat, fruits and vegetables, and the toughness of the polylactic acid film is superior to that of the existing fresh-keeping film.
Detailed Description
Example 1
The method for preparing the food-grade polylactic acid film by dissolving with glacial acetic acid provided by the embodiment comprises the following steps:
(1) mixing: mixing polylactic acid particles and glacial acetic acid with the purity of 99.5% according to the proportion that 1 g of polylactic acid particles is added into 15 ml of glacial acetic acid, and stirring while mixing to dissolve the lactic acid particles for 1min in the stirring process to obtain a mixed solution; the polylactic acid particles are produced by Nature Works in the United states and have the model of 4032D;
(2) hot melting: placing the mixed solution in a water bath constant temperature oscillator, and shaking and dissolving at 60 deg.C for 10min to completely dissolve polylactic acid to obtain a solution;
(3) film forming: heating the glass plate to 25 ℃, keeping the temperature for a certain time, pouring the solution on the glass plate, and uniformly coating the solution;
(4) forming: after the polylactic acid film on the glass plate is dried, putting the glass plate into water for soaking, and tearing off the polylactic acid film from the glass plate;
(5) and (3) drying: and naturally airing the torn polylactic acid film to obtain the polylactic acid film.
The polylactic acid film prepared by the embodiment can be used as a preservative film.
Example 2
The method for preparing the food-grade polylactic acid film by dissolving with glacial acetic acid provided by the embodiment comprises the following steps:
(1) mixing: mixing polylactic acid particles and glacial acetic acid with the purity of 99.5% according to the proportion that 1 g of polylactic acid particles is added into 22 ml of glacial acetic acid, stirring while mixing, and dissolving the lactic acid particles for 3min in the stirring process to obtain a mixed solution; the polylactic acid particles are produced by Nature Works in the United states and have the model of 4032D;
(2) hot melting: adding tea polyphenol 35% of polylactic acid particles, and dissolving the mixture in a water bath constant temperature oscillator at 50 deg.C for 20min to dissolve polylactic acid completely to obtain solution;
(3) film forming: heating the glass plate to 32 ℃, keeping the temperature for a certain time, then coating a layer of vaseline on the glass plate, pouring the solution on the glass plate or the glass plate, and uniformly coating the solution;
(4) forming: after the polylactic acid film on the glass plate is dried, putting the glass plate into water for soaking, and tearing off the polylactic acid film from the glass plate;
(5) and (3) drying: and naturally airing the torn polylactic acid film to obtain the polylactic acid film.
The polylactic acid film prepared by the embodiment can be used as a preservative film.
Example 3
The method for preparing the food-grade polylactic acid film by dissolving with glacial acetic acid provided by the embodiment comprises the following steps:
(1) mixing: mixing polylactic acid particles and glacial acetic acid with the purity of 99.5% according to the proportion that 1 g of polylactic acid particles is added into 30 ml of glacial acetic acid, stirring while mixing, and dissolving the lactic acid particles for 5min in the stirring process to obtain a mixed solution; the polylactic acid particles are produced by Nature Works in the United states and have the model of 4032D;
(2) hot melting: placing the mixed solution in a water bath constant temperature oscillator, and shaking and dissolving at 40 deg.C for 30min to completely dissolve polylactic acid to obtain a solution;
(3) film forming: heating a stainless steel plate to 40 ℃, keeping the temperature for a certain time, then coating a layer of vaseline on the stainless steel plate, pouring the dissolved solution on the stainless steel plate, and uniformly coating the dissolved solution;
(4) forming: after the polylactic acid on the stainless steel plate is formed into a film and dried, putting the stainless steel plate into water for soaking, and tearing off the polylactic acid film stainless steel plate;
(5) and (3) drying: and naturally airing the torn polylactic acid film to obtain the polylactic acid film.
The polylactic acid film prepared by the embodiment can be used as a preservative film.
Claims (9)
1. A method for preparing a food-grade polylactic acid film by dissolving glacial acetic acid is characterized by comprising the following steps:
(1) mixing: mixing polylactic acid particles and glacial acetic acid with the purity of 99.5% according to the proportion that 1 g of polylactic acid particles is added into 15-30 ml of glacial acetic acid, and stirring while mixing to obtain a mixed solution; the polylactic acid particles are produced by Nature Works in the United states and have the model of 4032D;
(2) hot melting: placing the mixed solution at a constant temperature of 40-60 ℃ to shake and dissolve the mixed solution, so that the polylactic acid is completely dissolved to obtain a dissolved solution;
(3) film forming: heating a glass plate or a stainless steel plate with a smooth surface, keeping for a certain time, pouring the solution on the glass plate or the stainless steel plate, and uniformly coating;
(4) forming: after the polylactic acid on the glass plate or the stainless steel plate is formed into a film and dried, separating the polylactic acid film from the glass plate or the stainless steel plate;
(5) and (3) drying: and naturally airing the separated polylactic acid film to obtain the polylactic acid film.
2. The method for preparing a food grade polylactic acid film by using glacial acetic acid dissolution according to claim 1, which comprises the following steps: the mixing and stirring time in the step (1) is 1-5 min.
3. The method for preparing a food grade polylactic acid film by using glacial acetic acid dissolution according to claim 1, which comprises the following steps: the shaking and dissolving time in the step (2) is 10-30 min.
4. The method for preparing a food grade polylactic acid film by using glacial acetic acid dissolution according to claim 3, which comprises the following steps: the mixed solution is also added with antibacterial components.
5. The method for preparing food grade polylactic acid film by using glacial acetic acid dissolution according to claim 4, characterized in that: the antibacterial component is tea polyphenol or natamycin.
6. The method for preparing a food grade polylactic acid film by using glacial acetic acid dissolution according to claim 1, which comprises the following steps: in the step (3), the glass plate or the stainless steel plate is heated to 25-40 ℃.
7. The method for preparing a food grade polylactic acid film by using glacial acetic acid dissolution according to claim 1 or 6, wherein: in the step (3), a layer of anti-adhesive film is coated on the glass plate or the stainless steel plate, and then the solution is poured on the glass plate or the stainless steel plate.
8. The method for preparing a food grade polylactic acid film by using glacial acetic acid dissolution according to claim 1, which comprises the following steps: the step (4) of separating the polylactic acid film from the glass plate or the stainless steel plate means that the polylactic acid film is torn off from the glass plate or the stainless steel plate after the glass plate or the stainless steel plate is soaked in water.
9. A food grade polylactic acid film prepared by the method of any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910050853.9A CN109734939B (en) | 2019-01-20 | 2019-01-20 | Method for preparing food-grade polylactic acid film by dissolving glacial acetic acid |
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| CN201910050853.9A CN109734939B (en) | 2019-01-20 | 2019-01-20 | Method for preparing food-grade polylactic acid film by dissolving glacial acetic acid |
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| CN109734939B true CN109734939B (en) | 2021-03-02 |
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Citations (6)
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| JP2003169967A (en) * | 2001-12-07 | 2003-06-17 | Asahi Kasei Corp | Fiber for hair of doll |
| CN1829764A (en) * | 2003-07-30 | 2006-09-06 | 三菱树脂株式会社 | Injection molded article, production method thereof and pellets used for injection molded article |
| CN101824160A (en) * | 2010-03-30 | 2010-09-08 | 东华大学 | Preparation method of chitosan/polyvinyl alcohol/polylactic acid blended porous membrane |
| JP2012012322A (en) * | 2010-06-30 | 2012-01-19 | Toray Ind Inc | Lactic acid and method for producing lactic acid |
| CN107936505A (en) * | 2017-11-22 | 2018-04-20 | 厦门理工学院 | A kind of polylactic acid antibacterial film and preparation method thereof |
| CN107973962A (en) * | 2017-12-11 | 2018-05-01 | 洛阳名力科技开发有限公司 | A kind of PE preservative films and preparation method thereof |
-
2019
- 2019-01-20 CN CN201910050853.9A patent/CN109734939B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003169967A (en) * | 2001-12-07 | 2003-06-17 | Asahi Kasei Corp | Fiber for hair of doll |
| CN1829764A (en) * | 2003-07-30 | 2006-09-06 | 三菱树脂株式会社 | Injection molded article, production method thereof and pellets used for injection molded article |
| CN101824160A (en) * | 2010-03-30 | 2010-09-08 | 东华大学 | Preparation method of chitosan/polyvinyl alcohol/polylactic acid blended porous membrane |
| JP2012012322A (en) * | 2010-06-30 | 2012-01-19 | Toray Ind Inc | Lactic acid and method for producing lactic acid |
| CN107936505A (en) * | 2017-11-22 | 2018-04-20 | 厦门理工学院 | A kind of polylactic acid antibacterial film and preparation method thereof |
| CN107973962A (en) * | 2017-12-11 | 2018-05-01 | 洛阳名力科技开发有限公司 | A kind of PE preservative films and preparation method thereof |
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