CN109734939A - A method of preparation food-grade polylactic acid film is dissolved using glacial acetic acid - Google Patents
A method of preparation food-grade polylactic acid film is dissolved using glacial acetic acid Download PDFInfo
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- CN109734939A CN109734939A CN201910050853.9A CN201910050853A CN109734939A CN 109734939 A CN109734939 A CN 109734939A CN 201910050853 A CN201910050853 A CN 201910050853A CN 109734939 A CN109734939 A CN 109734939A
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- polylactic acid
- film
- glacial acetic
- acetic 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
Abstract
The invention discloses a kind of methods that preparation food-grade polylactic acid film is dissolved using glacial acetic acid, and this method dissolves particles of polylactic acid using food-grade glacial acetic acid, then lysate is poured on glass plate or stainless steel plate and is formed a film.This method film-forming process is simple, obtained polylactic acid film belongs to food-grade, not only there is good toughness and degradability, and there is good gas-premeable, it can be used as fresh-keeping packaging material use, for extending the storage life of the food such as cold fresh meat, fruits and vegetables, toughness is better than existing preservative film.
Description
Technical field
The present invention relates to a kind of methods for preparing degradable polylactic acid film, are dissolved more particularly to a kind of using glacial acetic acid
The method for preparing food-grade polylactic acid film.
Background technique
Polylactic acid (PLA) film is a kind of novel biodegradation material, has the fundamental characteristics of biodegradable plastic,
Any harmful substance can will not be generated by safe disposal after use, compared to polyethylene (polyethylene, PE) film,
PLA film has high film build, high transparency and high water vapor permeability, and raw material sources are extensive.In addition, PLA film is also
With printing performance identical with traditional thin film materials.
At present PLA film mainly use the material of solid-state or semisolid state by the modes such as extruding, stretching, blow molding at
Film, since forming medium does not have mobility, film-forming process is more complex, it is therefore necessary to provide a kind of film-forming process letter
It is single, and the film made has the preparation method of the food-grade polylactic acid film of good toughness and degradability.
Summary of the invention
The purpose of the present invention is to provide a kind of film-forming process, polylactic acid film simple and obtained has excellent toughness
The method of preparation food-grade polylactic acid film is dissolved using glacial acetic acid.
It is provided by the invention it is a kind of using glacial acetic acid dissolve preparation food-grade polylactic acid film method the following steps are included:
(1) it mixes: particles of polylactic acid is mixed in proportion with glacial acetic acid, be stirred in mixing, obtain mixed liquor；
(2) thermosol: mixed liquor is placed under 40~60 DEG C of constant temperature and shakes dissolution, be completely dissolved polylactic acid, obtain
Lysate；
(3) it forms a film: the smooth glass plate in surface or stainless steel plate being heated, and keep certain time, lysate is poured on
On glass plate or stainless steel plate, and smear uniform；
(4) shape: after the polylactic acid film forming on glass plate or stainless steel plate is dry, by polylactic acid film and glass plate or
Stainless steel plate separation；
(5) dry: by the polylactic acid film naturally dry after separation up to polylactic acid film.
Further, the purity of glacial acetic acid described in step (1) is 99.5%, and particles of polylactic acid and purity are 99.5%
Glacial acetic acid is mixed in the ratio that 15~30 milliliters of glacial acetic acids are added in 1 gram of particles of polylactic acid, and mixing, the time stirred are 1~5min,
Particles of polylactic acid uses the particles of polylactic acid of the model 4032D of U.S. Nature Works production.
Further, the time of concussion dissolution is 10~30min in step (2).
Further, be additionally added antimicrobial component in step (2) in mixed liquor, the antimicrobial component be tea polyphenols or he
Mycin.
Further, glass plate or stainless steel plate are heated to 25~40 DEG C in step (3), first in glass plate or stainless steel
One layer of anti-adhesive agent film is applied on plate, then lysate is poured on glass plate or stainless steel plate.
Further, polylactic acid film is separated described in step (4) with glass plate or stainless steel plate and is referred to glass plate
Or stainless steel plate impregnate into the water after polylactic acid film is torn from glass plate or stainless steel plate.
The present invention also provides food-grade polylactic acid films prepared by the above method.
The present invention is film-made using polar organic solvent glacial acetic acid dissolution particles of polylactic acid, and particles of polylactic acid is gathered by lactic acid molecules
It closes, there is structure identical with the carbonyloxy group in glacial acetic acid molecule.After glacial acetic acid is mixed with particles of polylactic acid, according to phase
Like compatibility principle, glacial acetic acid can make particles of polylactic acid be dissolved into solution and have mobility.Since glacial acetic acid molecule has volatilization
Property, it can volatilize at a certain temperature, after glacial acetic acid volatilization, polylactic acid molecule reassembles and forms film.Due to ice used
Acetic acid is food-grade, and remains after polylactic acid film forming without acetic acid that plasticizer, lubricant etc. are not added yet in film-forming process, and other have
Evil substance, therefore obtained polylactic acid film has good foodsafety, can directly contact with food, will not generate increasing
Mould the residual such as agent, lubricant.
Film-forming process of the present invention is simple, and obtained polylactic acid film belongs to food-grade, not only have good toughness and
Degradability, and there is good gas-premeable, it can be used as fresh-keeping packaging material use, for extending cold fresh meat, fruit
The storage life of the food such as vegetable, toughness are better than existing preservative film.
Specific embodiment
Embodiment 1
It is provided in this embodiment using glacial acetic acid dissolve preparation food-grade polylactic acid film method the following steps are included:
(1) it mixes: 15 milliliters of ice is added by 1 gram of particles of polylactic acid in the glacial acetic acid that particles of polylactic acid and purity are 99.5%
The ratio of acetic acid mixes, and stirs in mixing, so that lactic acid particles is dissolved 1min in whipping process, obtain mixed liquor；The poly- cream
Granulates use the particles of polylactic acid of the model 4032D of U.S. Nature Works production；
(2) thermosol: mixed liquor is placed in 60 DEG C of concussion dissolution 10min in water-bath constant temperature oscillator, keeps polylactic acid completely molten
Solution, obtains lysate；
(3) it forms a film: glass plate being heated to 25 DEG C, and keeps the temperature certain time, on a glass by lysate,
And it smears uniform；
(4) it shapes: after glass plate is impregnated into the water that polylactic acid is thin after the polylactic acid film forming on glass plate is dry
Film is torn from glass plate；
(5) dry: by the polylactic acid film naturally dry torn up to polylactic acid film.
Polylactic acid film made from the present embodiment can be used as preservative film use.
Embodiment 2
It is provided in this embodiment using glacial acetic acid dissolve preparation food-grade polylactic acid film method the following steps are included:
(1) it mixes: 22 milliliters of ice is added by 1 gram of particles of polylactic acid in the glacial acetic acid that particles of polylactic acid and purity are 99.5%
The ratio of acetic acid mixes, and stirs in mixing, so that lactic acid particles is dissolved 3min in whipping process, obtain mixed liquor；The poly- cream
Granulates use the particles of polylactic acid of the model 4032D of U.S. Nature Works production；
(2) thermosol: being added tea polyphenols in mixed liquor, and additional amount is the 35% of particles of polylactic acid quality, then will mix
It closes liquid and is placed in 50 DEG C of concussion dissolution 20min in water-bath constant temperature oscillator, be completely dissolved polylactic acid, obtain lysate；
(3) it forms a film: glass plate being heated to 32 DEG C, and keeps the temperature certain time, then apply one layer on a glass
Vaseline, then by lysate be poured on glass plate or on, and smear uniform；
(4) it shapes: after glass plate is impregnated into the water that polylactic acid is thin after the polylactic acid film forming on glass plate is dry
Film is torn from glass plate；
(5) dry: by the polylactic acid film naturally dry torn up to polylactic acid film.
Polylactic acid film made from the present embodiment can be used as preservative film use.
Embodiment 3
It is provided in this embodiment using glacial acetic acid dissolve preparation food-grade polylactic acid film method the following steps are included:
(1) it mixes: 30 milliliters of ice is added by 1 gram of particles of polylactic acid in the glacial acetic acid that particles of polylactic acid and purity are 99.5%
The ratio of acetic acid mixes, and stirs in mixing, so that lactic acid particles is dissolved 5min in whipping process, obtain mixed liquor；The poly- cream
Granulates use the particles of polylactic acid of the model 4032D of U.S. Nature Works production；
(2) thermosol: mixed liquor is placed in 40 DEG C of concussion dissolution 30min in water-bath constant temperature oscillator, keeps polylactic acid completely molten
Solution, obtains lysate；
(3) it forms a film: stainless steel plate being heated to 40 DEG C, and keeps the temperature certain time, is then applied on stainless steel
One layer of vaseline, then on stainless steel by lysate, and smear uniform；
(4) it shapes: after the polylactic acid film forming on stainless steel plate is dry, by poly- cream after stainless steel plate is impregnated into the water
Sour film stainless steel plate is torn；
(5) dry: by the polylactic acid film naturally dry torn up to polylactic acid film.
Polylactic acid film made from the present embodiment can be used as preservative film use.
Claims (10)
1. a kind of method for dissolving preparation food-grade polylactic acid film using glacial acetic acid, it is characterised in that the following steps are included:
(1) it mixes: particles of polylactic acid is mixed in proportion with glacial acetic acid, be stirred in mixing, obtain mixed liquor；
(2) thermosol: mixed liquor is placed under 40~60 DEG C of constant temperature and shakes dissolution, be completely dissolved polylactic acid, must dissolve
Liquid；
(3) it forms a film: the smooth glass plate in surface or stainless steel plate being heated, and keep certain time, lysate is poured on glass
On plate or stainless steel plate, and smear uniform；
(4) it shapes: after the polylactic acid film forming on glass plate or stainless steel plate is dry, by polylactic acid film and glass plate or stainless
Steel plate separation；
(5) dry: by the polylactic acid film naturally dry after separation up to polylactic acid film.
2. the method according to claim 1 for dissolving preparation food-grade polylactic acid film using glacial acetic acid, it is characterised in that:
The purity of glacial acetic acid described in step (1) is 99.5%, and the glacial acetic acid that particles of polylactic acid is 99.5% with purity presses 1 gram of polylactic acid
The ratio mixing of 15~30 milliliters of glacial acetic acids is added in particle.
3. the method according to claim 1 or 2 for being dissolved preparation food-grade polylactic acid film using glacial acetic acid, feature are existed
In: mixing, the time stirred are 1~5min in step (1).
4. the method according to claim 1 for dissolving preparation food-grade polylactic acid film using glacial acetic acid, it is characterised in that:
The time of concussion dissolution is 10~30min in step (2).
5. the method according to claim 4 for dissolving preparation food-grade polylactic acid film using glacial acetic acid, it is characterised in that:
Antimicrobial component has been additionally added in mixed liquor.
6. the method according to claim 5 for dissolving preparation food-grade polylactic acid film using glacial acetic acid, it is characterised in that:
The antimicrobial component is tea polyphenols or Natamycin.
7. the method according to claim 1 for dissolving preparation food-grade polylactic acid film using glacial acetic acid, it is characterised in that:
Glass plate or stainless steel plate are heated to 25~40 DEG C in step (3).
8. the method according to claim 1 or claim 7 for being dissolved preparation food-grade polylactic acid film using glacial acetic acid, feature are existed
In: one layer of anti-adhesive agent film is first applied in step (3) on glass plate or stainless steel plate, then lysate is poured on glass plate or stainless
On steel plate.
9. the method according to claim 1 for dissolving preparation food-grade polylactic acid film using glacial acetic acid, it is characterised in that:
Polylactic acid film is separated with glass plate or stainless steel plate described in step (4) and is referred to glass plate or stainless steel plate into the water
Polylactic acid film is torn from glass plate or stainless steel plate after immersion.
10. a kind of food-grade polylactic acid film as made from any one method in claim 1~9.
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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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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 |
-
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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