CN117447821A - High-performance multifunctional PLA/PBAT-based composite membrane and preparation method and application thereof - Google Patents
High-performance multifunctional PLA/PBAT-based composite membrane and preparation method and application thereof Download PDFInfo
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- CN117447821A CN117447821A CN202311215282.2A CN202311215282A CN117447821A CN 117447821 A CN117447821 A CN 117447821A CN 202311215282 A CN202311215282 A CN 202311215282A CN 117447821 A CN117447821 A CN 117447821A
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- 239000002131 composite material Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 229920001896 polybutyrate Polymers 0.000 title claims 8
- 239000012528 membrane Substances 0.000 title description 4
- 229920002472 Starch Polymers 0.000 claims abstract description 44
- 239000008107 starch Substances 0.000 claims abstract description 43
- 235000019698 starch Nutrition 0.000 claims abstract description 43
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 16
- 235000013305 food Nutrition 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000007613 environmental effect Effects 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 238000004806 packaging method and process Methods 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 39
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 29
- 239000002159 nanocrystal Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 14
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 11
- HCUARRIEZVDMPT-UHFFFAOYSA-N Indole-2-carboxylic acid Chemical compound C1=CC=C2NC(C(=O)O)=CC2=C1 HCUARRIEZVDMPT-UHFFFAOYSA-N 0.000 claims description 9
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims description 9
- 229960003280 cupric chloride Drugs 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- MPTQRFCYZCXJFQ-UHFFFAOYSA-L copper(II) chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Cu+2] MPTQRFCYZCXJFQ-UHFFFAOYSA-L 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 229920002261 Corn starch Polymers 0.000 claims description 4
- 239000008120 corn starch Substances 0.000 claims description 4
- 238000009210 therapy by ultrasound Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000002520 smart material Substances 0.000 claims 1
- 239000004626 polylactic acid Substances 0.000 abstract description 56
- 229920000747 poly(lactic acid) Polymers 0.000 abstract description 55
- 239000000463 material Substances 0.000 abstract description 22
- 230000008859 change Effects 0.000 abstract description 9
- 230000004044 response Effects 0.000 abstract description 8
- 241000143060 Americamysis bahia Species 0.000 abstract description 4
- 235000013372 meat Nutrition 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 238000003860 storage Methods 0.000 abstract description 4
- WSQZNZLOZXSBHA-UHFFFAOYSA-N 3,8-dioxabicyclo[8.2.2]tetradeca-1(12),10,13-triene-2,9-dione Chemical compound O=C1OCCCCOC(=O)C2=CC=C1C=C2 WSQZNZLOZXSBHA-UHFFFAOYSA-N 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 6
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 239000012767 functional filler Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000009472 formulation Methods 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 235000010676 Ocimum basilicum Nutrition 0.000 description 1
- 240000007926 Ocimum gratissimum Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003115 biocidal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- -1 polybutylene terephthalate-adipate Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- 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
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/04—Starch derivatives
- C08J2403/06—Esters
-
- 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
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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 belongs to the technical field of polymer composite materials, and in particular relates to a high-performance multifunctional PLA/PBAT (polylactic acid/Poly-butylene terephthalate) based composite film, and a preparation method and application thereof, wherein the composite film is prepared from the following raw materials: PLA, PBAT, functionalized modified nano starch. The invention also provides a preparation method of the PLA/PBAT-based composite material, the prepared composite film material has excellent mechanical strength, elongation at break, toughness, ultraviolet obstruction, high-energy blue light obstruction, water vapor obstruction, ammonia response color change, biodegradability and other performances, can maintain higher visible light transparency, can be used as an intelligent indication material for effectively indicating the freshness change condition of meat foods such as shrimps in the storage process in time, and has a simple preparation process and wide application value in the fields of food packaging, intelligent materials, ammonia detection, environmental monitoring, safety and the like.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a high-performance multifunctional PLA/PBAT (polylactic acid/Poly-butylene terephthalate) based composite film and a preparation method and application thereof.
Background
In recent years, biodegradable materials are rapidly developed, and polybutylene terephthalate-adipate (PBAT) and polylactic acid (PLA) are two biodegradable materials which are widely researched, and are widely applied to the fields of agricultural mulching films, packaging materials, disposable tableware and the like. PBAT has excellent toughness and impact properties, but low tensile strength, flexural strength. PLA has high tensile and flexural properties, but has high brittleness and a low crystallization rate. Blending PBAT and PLA is expected to make up for the respective deficiencies. However, PBAT, PLA have limited compatibility during blending, such that the properties are below target values. The filler is introduced into the PBAT/PLA blend, so that the interfacial compatibility can be enhanced, and the mechanical property of the product is improved. Meanwhile, the PLA/PBAT composite material also lacks the functions of ammonia response, ultraviolet blocking, antibiosis and the like, so that the PLA/PBAT composite material is limited in practical application. Starch nanocrystals are a class of bio-based nanomaterials derived from starch and characterized by green, edible, high specific surface area, high crystallinity, etc., and are often used as "nanofillers" for biodegradable films. However, hydrophilic starch nanocrystals are difficult to disperse effectively in organic solvents (such as chloroform) as well as hydrophobic PLA/PBAT matrices, which is detrimental to the modification of PLA/PBAT composites by starch nanocrystals, thereby limiting the use of starch nanocrystals as "nanofillers" for PLA/PBAT composites. The invention uses the functionalized modified nano starch as the functional filler, can be effectively dispersed in the hydrophobic PLA/PBAT matrix, so as to improve the performances of the PLA/PBAT composite material such as mechanical strength, elongation at break, toughness, ultraviolet blocking, high-energy blue light blocking, water vapor blocking, ammonia response color change and the like, develop the high-performance multifunctional PLA/PBAT matrix composite film, and widen the application of the composite film in the fields of food packaging, intelligent materials, ammonia detection, environmental monitoring, safety and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-performance multifunctional PLA/PBAT-based composite membrane, and a preparation method and application thereof. The composite material has the advantages of excellent mechanical strength, elongation at break, toughness, ultraviolet obstruction, high-energy blue light obstruction, water vapor obstruction, ammonia response color change and the like, can maintain higher visible light transparency, can be used as an intelligent indicating material for timely and effectively indicating the change condition of freshness of meat foods (such as shrimps and the like) in the storage process, and has simple preparation process, environmental protection, low cost and suitability for amplified production.
The technical scheme of the invention is as follows:
the invention provides a high-performance multifunctional PLA/PBAT-based composite film which is characterized by comprising the following components in parts by weight: 90 parts of PLA, 10 parts of PBAT and 2-4 parts of functionalized modified nano starch;
the preparation method of the functionalized modified nano starch comprises the following steps:
(1) Adding 200 parts of corn starch into 5000 parts of deionized water, stirring for 30min at 90 ℃ to obtain a starch solution, then adding 5000 parts of ethanol, continuously stirring for 75min at 90 ℃, cooling to room temperature, and then sequentially carrying out centrifugal separation, ethanol washing and drying to obtain white starch nanocrystals for later use;
(2) Weighing 40 parts of the starch nanocrystal obtained in the step (1), adding the starch nanocrystal into 3000 parts of methanol, and stirring for 30min at room temperature to obtain uniform starch nanocrystal dispersion liquid for later use;
(3) Taking 16.5 parts of copper dichloride dihydrate, and dissolving the copper dichloride in 1000 parts of methanol to obtain a uniform copper dichloride solution for later use;
(4) Adding the copper dichloride solution obtained in the step (3) into the starch nanocrystal dispersion liquid obtained in the step (2), and stirring for 120 min at room temperature to obtain a uniform blending liquid for later use;
(5) Dissolving 32.2 parts of 2-indolecarboxylic acid and 11.2 parts of potassium hydroxide in 2000 parts of methanol to obtain a uniform solution for later use;
(6) Adding the solution obtained in the step (5) into the blending solution obtained in the step (4), stirring at room temperature to react 12 and h, and then sequentially carrying out centrifugal separation, methanol washing and drying to obtain the functionalized modified nano starch.
The invention also provides a preparation method of the high-performance multifunctional PLA/PBAT-based composite film, which comprises the following steps:
(1) Dissolving 90 parts of PLA in 1500 parts of chloroform, simultaneously dissolving 10 parts of PBAT in 500 parts of chloroform, then adding the PBAT solution into the PLA solution, and stirring for 30min at room temperature to obtain a uniform blending solution for later use;
(2) Adding 2-4 parts of functionalized modified nano starch into 500 parts of chloroform, performing ultrasonic treatment at room temperature for 30min, and then stirring for 30min to obtain uniform dispersion liquid for later use;
(3) Adding the dispersion liquid obtained in the step (2) into the blending liquid obtained in the step (1), and stirring for 2 hours at room temperature to obtain uniform film forming liquid for later use;
(4) Pouring the film forming liquid obtained in the step (3) into a flat-bottom glass dish, and drying 12 h in an oven at 45 ℃ to obtain the high-performance multifunctional PLA/PBAT-based composite film.
The application of the high-performance multifunctional PLA/PBAT-based composite film can be used in the fields of food packaging, intelligent materials, ammonia gas detection, environmental monitoring, safety and the like.
Compared with the prior art, the invention has the following beneficial effects:
the invention uses the functionalized modified nano starch as the functional filler, and can be effectively dispersed in the hydrophobic PLA/PBAT matrix to obtain uniform and compact high-performance multifunctional PLA/PBAT matrix composite film material; in addition, the PLA/PBAT based composite film prepared by the invention has excellent mechanical strength, elongation at break, toughness, ultraviolet obstruction, high-energy blue light obstruction, water vapor obstruction, ammonia response discoloration, biodegradability and other performances, can also maintain higher visible light transparency, can be used as an intelligent indication material for timely and effectively indicating the change condition of freshness of meat foods (such as shrimps and the like) in the storage process, has simple preparation process, environment friendliness and low cost, is suitable for amplified production, and has wide application value in the fields of food packaging, intelligent materials, ammonia detection, environmental monitoring, safety and the like.
Drawings
Fig. 1 (a) is a scanning electron microscope image of a starch nanocrystal according to the present invention, and fig. 1 (b) is a scanning electron microscope image of a functionalized modified nano starch according to the present invention;
fig. 2 is a physical photograph of a PLA/PBAT composite film prepared in the comparative example of the present invention and a high-performance multifunctional PLA/PBAT-based composite film sample material prepared in the example.
Detailed Description
The present invention will now be described in more detail by way of examples, which are given by way of illustration only and are not to be construed as limiting the scope of the invention, which is defined by the appended claims.
In the following specific examples and comparative examples formulation, preparation methods, the PLA (CAS number: 9063-38-1) was a product supplied by Roen reagent Co., ltd; the PBAT (CAS number 55231-08-8) was a product offered by Roun reagent Co., ltd; corn starch (CAS number 9005-25-8) is a product offered by Aba Ding Shiji Co., ltd; copper dichloride dihydrate (CAS number 10125-13-0) is an analytically pure reagent supplied by Shanghai Yi En chemical technology Co., ltd; potassium hydroxide (CAS number 1310-58-3) is an analytically pure reagent supplied by the company of the sciences, gmbH, basil; methanol (CAS number 1477-50-5) is an analytically pure reagent supplied by the company West Shake sciences Co., ltd; 2-indolecarboxylic acid is an analytically pure reagent supplied by Hua Weirui family chemical industry Co., ltd.
In the following specific examples and comparative examples, formulations, preparation methods, the preparation method of the functionalized modified nano starch comprises the following steps:
(1) Adding 200 parts of corn starch into 5000 parts of deionized water, stirring for 30min at 90 ℃ to obtain a starch solution, then adding 5000 parts of ethanol, continuously stirring for 75min at 90 ℃, cooling to room temperature, and then sequentially carrying out centrifugal separation, ethanol washing and drying to obtain white starch nanocrystals for later use;
(2) Weighing 40 parts of the starch nanocrystal obtained in the step (1), adding the starch nanocrystal into 3000 parts of methanol, and stirring for 30min at room temperature to obtain uniform starch nanocrystal dispersion liquid for later use;
(3) Taking 16.5 parts of copper dichloride dihydrate, and dissolving the copper dichloride in 1000 parts of methanol to obtain a uniform copper dichloride solution for later use;
(4) Adding the copper dichloride solution obtained in the step (3) into the starch nanocrystal dispersion liquid obtained in the step (2), and stirring for 120 min at room temperature to obtain a uniform blending liquid for later use;
(5) Dissolving 32.2 parts of 2-indolecarboxylic acid and 11.2 parts of potassium hydroxide in 2000 parts of methanol to obtain a uniform solution for later use;
(6) Adding the solution obtained in the step (5) into the blending solution obtained in the step (4), stirring at room temperature to react 12 and h, and then sequentially carrying out centrifugal separation, methanol washing and drying to obtain the functionalized modified nano starch.
Example 1
The high-performance multifunctional PLA/PBAT-based composite film is characterized by comprising the following components in parts by weight: 90 parts of PLA, 10 parts of PBAT and 2 parts of functionalized modified nano starch;
the preparation method comprises the following steps:
(1) Dissolving 90 parts of PLA in 1500 parts of chloroform, simultaneously dissolving 10 parts of PBAT in 500 parts of chloroform, then adding the PBAT solution into the PLA solution, and stirring for 30min at room temperature to obtain a uniform blending solution for later use;
(2) Adding 2 parts of functionalized modified nano starch into 500 parts of chloroform, performing ultrasonic treatment at room temperature for 30min, and then stirring for 30min to obtain uniform dispersion liquid for later use;
(3) Adding the dispersion liquid obtained in the step (2) into the blending liquid obtained in the step (1), and stirring for 2 hours at room temperature to obtain uniform film forming liquid for later use;
(4) Pouring the film forming liquid obtained in the step (3) into a flat-bottom glass dish, and drying 12 h in an oven at 45 ℃ to obtain the high-performance multifunctional PLA/PBAT-based composite film.
Example 2
The high-performance multifunctional PLA/PBAT-based composite film is characterized by comprising the following components in parts by weight: 90 parts of PLA, 10 parts of PBAT and 4 parts of functionalized modified nano starch;
the preparation method comprises the following steps:
(1) Dissolving 90 parts of PLA in 1500 parts of chloroform, simultaneously dissolving 10 parts of PBAT in 500 parts of chloroform, then adding the PBAT solution into the PLA solution, and stirring for 30min at room temperature to obtain a uniform blending solution for later use;
(2) Adding 4 parts of functionalized modified nano starch into 500 parts of chloroform, performing ultrasonic treatment at room temperature for 30min, and then stirring for 30min to obtain uniform dispersion liquid for later use;
(3) Adding the dispersion liquid obtained in the step (2) into the blending liquid obtained in the step (1), and stirring for 2 hours at room temperature to obtain uniform film forming liquid for later use;
(4) Pouring the film forming liquid obtained in the step (3) into a flat-bottom glass dish, and drying 12 h in an oven at 45 ℃ to obtain the high-performance multifunctional PLA/PBAT-based composite film.
Comparative example
As a comparative standard to the above examples, the present invention provides PLA/PBAT composite films prepared without functionalized modified nano-starches, comprising the steps of:
(1) Dissolving 90 parts of PLA in 1500 parts of chloroform, simultaneously dissolving 10 parts of PBAT in 500 parts of chloroform, then adding the PBAT solution into the PLA solution, and stirring for 30min at room temperature to obtain a uniform blending solution for later use;
(2) Adding 500 parts of chloroform into the blending liquid obtained in the step (1), and stirring for 2 hours at room temperature to obtain uniform film forming liquid for later use;
(3) Pouring the film forming liquid obtained in the step (2) into a flat-bottom glass dish, and drying 12 h in an oven at 45 ℃ to obtain the PLA/PBAT composite film.
Structure and performance testing:
the PLA/PBAT composite film prepared by the comparative example and the high-performance multifunctional PLA/PBAT-based composite film prepared by the embodiment are subjected to structure and performance test, wherein ultraviolet visible performance is tested by adopting an ultraviolet visible spectrometer (Lamdba 365, platinum Elmer instrument company), and the average transmittance of ultraviolet is calculated by referring to GB/T18830-2009; tensile properties were tested according to GB/T1040-2006; the water vapor transmission coefficient was measured according to ASTM E96; the ammonia response test method is as follows: the sample film material was exposed to an ammonia atmosphere, and the color change of the sample film material was observed.
The above performance test data are shown in table 1.
Table 1 sample performance test data
| Group of | Example 1 | Example 2 | Comparative example |
| Ultraviolet average transmittance (%) | 0.24 | 0.18 | 0.51 |
| High energy blue light averagingTransmittance (%) | 1.30 | 1.01 | 1.82 |
| Tensile Strength (MPa) | 25.08 | 24.82 | 24.42 |
| Elongation at break (%) | 11.03 | 7.94 | 6.38 |
| Toughness (MJ/m) 3 ） | 2.42 | 1.41 | 1.23 |
| Coefficient of vapor permeation (10) -8 g/m∙h∙Pa） | 5.09 | 4.60 | 5.48 |
The ammonia response test experiment result proves that the PLA/PBAT composite film material prepared by the comparative example is colorless and transparent, and has no color change or colorless and transparent optical property after being exposed to ammonia environment; the high-performance multifunctional PLA/PBAT-based composite film material prepared in the embodiment 1 is light green, and the color of the composite film material changes into light blue after the composite film material is exposed to an ammonia environment; the high performance multifunctional PLA/PBAT based composite film material prepared in example 2 was green and changed to blue after exposure to ammonia gas.
In a word, the invention uses the functionalized modified nano starch as the functional filler, and can be effectively dispersed in the hydrophobic PLA/PBAT matrix to obtain uniform and compact high-performance multifunctional PLA/PBAT matrix composite membrane material; in addition, the high-performance multifunctional PLA/PBAT-based composite film material prepared by the invention has the advantages of excellent mechanical strength, elongation at break, toughness, ultraviolet blocking, high-energy blue light blocking, water vapor blocking, ammonia response color changing, biodegradability and other performances, can maintain higher visible light transparency, can be used as an intelligent indication material for timely and effectively indicating the change condition of freshness of meat foods such as shrimps in the storage process, has simple preparation process, is environment-friendly and low in cost, is suitable for amplified production, and has wide application value in the fields of food packaging, intelligent materials, ammonia detection, environmental monitoring, safety and the like.
The content of the invention is not limited to the examples listed, and any equivalent transformation to the technical solution of the invention that a person skilled in the art can take on by reading the description of the invention is covered by the claims of the invention.
Claims (3)
1. The high-performance multifunctional PLA/PBAT-based composite film is characterized by comprising the following components in parts by weight: 90 parts of PLA, 10 parts of PBAT and 2-4 parts of functionalized modified nano starch;
the preparation method of the functionalized modified nano starch comprises the following steps:
(1) Adding 200 parts of corn starch into 5000 parts of deionized water, stirring for 30min at 90 ℃ to obtain a starch solution, then adding 5000 parts of ethanol, continuously stirring for 75min at 90 ℃, cooling to room temperature, and then sequentially carrying out centrifugal separation, ethanol washing and drying to obtain white starch nanocrystals for later use;
(2) Weighing 40 parts of the starch nanocrystal obtained in the step (1), adding the starch nanocrystal into 3000 parts of methanol, and stirring for 30min at room temperature to obtain uniform starch nanocrystal dispersion liquid for later use;
(3) Taking 16.5 parts of copper dichloride dihydrate, and dissolving the copper dichloride in 1000 parts of methanol to obtain a uniform copper dichloride solution for later use;
(4) Adding the copper dichloride solution obtained in the step (3) into the starch nanocrystal dispersion liquid obtained in the step (2), and stirring for 120 min at room temperature to obtain a uniform blending liquid for later use;
(5) Dissolving 32.2 parts of 2-indolecarboxylic acid and 11.2 parts of potassium hydroxide in 2000 parts of methanol to obtain a uniform solution for later use;
(6) Adding the solution obtained in the step (5) into the blending solution obtained in the step (4), stirring at room temperature to react 12 and h, and then sequentially carrying out centrifugal separation, methanol washing and drying to obtain the functionalized modified nano starch.
2. The method for preparing a high-performance multifunctional PLA/PBAT-based composite film according to claim 1, characterized by comprising the steps of:
(1) Dissolving 90 parts of PLA in 1500 parts of chloroform, simultaneously dissolving 10 parts of PBAT in 500 parts of chloroform, then adding the PBAT solution into the PLA solution, and stirring for 30min at room temperature to obtain a uniform blending solution for later use;
(2) Adding 2-4 parts of functionalized modified nano starch into 500 parts of chloroform, performing ultrasonic treatment at room temperature for 30min, and then stirring for 30min to obtain uniform dispersion liquid for later use;
(3) Adding the dispersion liquid obtained in the step (2) into the blending liquid obtained in the step (1), and stirring for 2 hours at room temperature to obtain uniform film forming liquid for later use;
(4) Pouring the film forming liquid obtained in the step (3) into a flat-bottom glass dish, and drying 12 h in an oven at 45 ℃ to obtain the high-performance multifunctional PLA/PBAT-based composite film.
3. The use of the high performance multifunctional PLA/PBAT based composite film according to claim 1, for the fields of food packaging, smart materials, ammonia detection, environmental monitoring and safety.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311215282.2A CN117447821A (en) | 2023-09-20 | 2023-09-20 | High-performance multifunctional PLA/PBAT-based composite membrane and preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311215282.2A CN117447821A (en) | 2023-09-20 | 2023-09-20 | High-performance multifunctional PLA/PBAT-based composite membrane and preparation method and application thereof |
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| CN117447821A true CN117447821A (en) | 2024-01-26 |
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| CN202311215282.2A Pending CN117447821A (en) | 2023-09-20 | 2023-09-20 | High-performance multifunctional PLA/PBAT-based composite membrane and preparation method and application thereof |
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2023
- 2023-09-20 CN CN202311215282.2A patent/CN117447821A/en active Pending
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