CN117126518A - Biological environment-friendly toughened strong-antioxidant antibacterial polylactic acid composite material and preparation method thereof - Google Patents
Biological environment-friendly toughened strong-antioxidant antibacterial polylactic acid composite material and preparation method thereof Download PDFInfo
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- 239000004626 polylactic acid Substances 0.000 title claims abstract description 70
- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 69
- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 43
- 239000003963 antioxidant agent Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 82
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 31
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 30
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- -1 polyphenol compounds Chemical class 0.000 claims abstract description 21
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims description 38
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000012986 modification Methods 0.000 claims description 9
- 230000004048 modification Effects 0.000 claims description 9
- 229940074391 gallic acid Drugs 0.000 claims description 7
- 235000004515 gallic acid Nutrition 0.000 claims description 7
- CWVRJTMFETXNAD-FWCWNIRPSA-N 3-O-Caffeoylquinic acid Natural products O[C@H]1[C@@H](O)C[C@@](O)(C(O)=O)C[C@H]1OC(=O)\C=C\C1=CC=C(O)C(O)=C1 CWVRJTMFETXNAD-FWCWNIRPSA-N 0.000 claims description 5
- PZIRUHCJZBGLDY-UHFFFAOYSA-N Caffeoylquinic acid Natural products CC(CCC(=O)C(C)C1C(=O)CC2C3CC(O)C4CC(O)CCC4(C)C3CCC12C)C(=O)O PZIRUHCJZBGLDY-UHFFFAOYSA-N 0.000 claims description 5
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- CWVRJTMFETXNAD-JUHZACGLSA-N chlorogenic acid Chemical compound O[C@@H]1[C@H](O)C[C@@](O)(C(O)=O)C[C@H]1OC(=O)\C=C\C1=CC=C(O)C(O)=C1 CWVRJTMFETXNAD-JUHZACGLSA-N 0.000 claims description 5
- 229940074393 chlorogenic acid Drugs 0.000 claims description 5
- FFQSDFBBSXGVKF-KHSQJDLVSA-N chlorogenic acid Natural products O[C@@H]1C[C@](O)(C[C@@H](CC(=O)C=Cc2ccc(O)c(O)c2)[C@@H]1O)C(=O)O FFQSDFBBSXGVKF-KHSQJDLVSA-N 0.000 claims description 5
- 235000001368 chlorogenic acid Nutrition 0.000 claims description 5
- BMRSEYFENKXDIS-KLZCAUPSSA-N cis-3-O-p-coumaroylquinic acid Natural products O[C@H]1C[C@@](O)(C[C@@H](OC(=O)C=Cc2ccc(O)cc2)[C@@H]1O)C(=O)O BMRSEYFENKXDIS-KLZCAUPSSA-N 0.000 claims description 5
- IPQKDIRUZHOIOM-UHFFFAOYSA-N Oroxin A Natural products OC1C(O)C(O)C(CO)OC1OC(C(=C1O)O)=CC2=C1C(=O)C=C(C=1C=CC=CC=1)O2 IPQKDIRUZHOIOM-UHFFFAOYSA-N 0.000 claims description 4
- IKIIZLYTISPENI-ZFORQUDYSA-N baicalin Chemical compound O1[C@H](C(O)=O)[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1OC(C(=C1O)O)=CC2=C1C(=O)C=C(C=1C=CC=CC=1)O2 IKIIZLYTISPENI-ZFORQUDYSA-N 0.000 claims description 4
- 229960003321 baicalin Drugs 0.000 claims description 4
- AQHDANHUMGXSJZ-UHFFFAOYSA-N baicalin Natural products OC1C(O)C(C(O)CO)OC1OC(C(=C1O)O)=CC2=C1C(=O)C=C(C=1C=CC=CC=1)O2 AQHDANHUMGXSJZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 229920001432 poly(L-lactide) Polymers 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
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- 150000008442 polyphenolic compounds Chemical group 0.000 description 6
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- 230000003064 anti-oxidating effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000004806 packaging method and process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000002292 Radical scavenging effect Effects 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920001817 Agar Polymers 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 240000003183 Manihot esculenta Species 0.000 description 1
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
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- 230000006978 adaptation Effects 0.000 description 1
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- 229920003232 aliphatic polyester Polymers 0.000 description 1
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- MGJZITXUQXWAKY-UHFFFAOYSA-N diphenyl-(2,4,6-trinitrophenyl)iminoazanium Chemical compound [O-][N+](=O)C1=CC([N+](=O)[O-])=CC([N+]([O-])=O)=C1N=[N+](C=1C=CC=CC=1)C1=CC=CC=C1 MGJZITXUQXWAKY-UHFFFAOYSA-N 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
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- 125000000524 functional group Chemical group 0.000 description 1
- 238000000338 in vitro Methods 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
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- 239000011846 petroleum-based material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 239000004416 thermosoftening plastic Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
-
- 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
- C08K9/12—Adsorbed ingredients, e.g. ingredients on carriers
-
- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
-
- 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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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material and a preparation method thereof, and belongs to the technical field of polylactic acid composite materials. According to the invention, natural polyphenol compounds are used as a modifier to modify calcium carbonate, the modified calcium carbonate and polylactic acid are premixed and then are melt-blended, and then the toughened strong antioxidant antibacterial polylactic acid composite material is obtained through hot press molding. The invention utilizes the structural characteristics and functional characteristics of the polyphenol compounds, and obtains the polylactic acid composite material which has good antioxidant and antibacterial properties, good mechanical properties, environmental protection and complete degradation through a simple preparation process.
Description
Technical Field
The invention relates to the technical field of polylactic acid composite materials, in particular to a biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material and a preparation method thereof.
Background
Along with the development of economy and society, the traditional petroleum-based materials rapidly occupy important roles in various fields of life production by virtue of the advantages of low price, excellent performance, multiple functions and the like, but the nondegradability of the traditional high polymer materials brings great convenience to people and brings great environmental protection burden. Therefore, the development of novel, green, safe and environment-friendly biodegradable materials becomes a hot spot problem in the current material field research. Polylactic acid (PLA) is a thermoplastic aliphatic polyester material which is prepared by taking natural plants such as corn, wheat, cassava and the like as raw materials and fermenting and polymerizing the raw materials. Polylactic acid products can be completely degraded into carbon dioxide and water by microorganisms in the nature under certain environment, and are novel biodegradable materials and recognized environment-friendly thermoplastic materials. The polylactic acid material has the characteristics of biodegradability, reproducibility, good biocompatibility, easy processing, good transparency and the like, so that the polylactic acid material has wide application in the fields of textile, food packaging, agricultural mulching films, daily necessities and the like, and has great market application prospect. But the problems of poor mechanical property, high production cost and the like limit the large-scale application of the material to a certain extent. Currently, the modification of inorganic nonmetallic powder such as calcium carbonate, barium sulfate, talcum powder and the like which are cheap and easy to obtain is a good way for enhancing the mechanical property and reducing the production cost. The problems of poor toughness, high production cost and the like of the method are solved to a certain extent, and the application of the method in the fields of plastics, fabrics, film products and the like is expanded. However, the polylactic acid material obtained by the modification has relatively large limitation in the field of food packaging with antioxidant and antibacterial requirements. In order to solve the problem, a method for preparing the polylactic acid composite material with good mechanical property and oxidation resistance and antibacterial activity is needed to expand the application of the polylactic acid material in the field of food packaging.
Disclosure of Invention
The invention aims to provide a biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material and a preparation method thereof, which are used for solving the technical problem that the conventional polylactic acid material cannot meet the requirements of antioxidant and antibacterial properties when used in the field of food packaging.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of a biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material, which comprises the following steps:
1) Adding natural polyphenol compounds into calcium carbonate, mixing and modifying to obtain modified calcium carbonate;
2) Mixing modified calcium carbonate and polylactic acid, and sequentially carrying out melt blending and hot press molding to obtain the biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material;
the polyphenol compound comprises one or more of gallic acid, chlorogenic acid and baicalin.
Furthermore, the addition amount of the natural polyphenol compound is 0.5-5% of the mass of the calcium carbonate.
Further, the particle size of the calcium carbonate is 2000-4000 meshes.
Further, in the step 1), the temperature of the mixing modification treatment is 300-350 ℃, and the time of the mixing modification treatment is 30-50 min.
Further, the addition amount of the modified calcium carbonate is 10-50% of the mass of the polylactic acid.
Further, the content of poly-L-lactic acid in the polylactic acid is not less than 98%.
Further, the temperature of the melt blending is 140-180 ℃, and the time of the melt blending is 10-30 min.
Further, the temperature of the hot press molding is 150-170 ℃, and the pressure of the hot press molding is 8-15 MPa.
The invention also provides a biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material.
The invention has the beneficial effects that:
according to the invention, the natural polyphenol compound with the structure containing both phenolic hydroxyl and carboxyl functional groups is used as a modifier, and the carboxyl groups are adsorbed on the surfaces of calcium carbonate particles, so that the hydrophilicity of the calcium carbonate is reduced, the hydrophobicity of the calcium carbonate is improved, and the compatibility of calcium carbonate powder and polylactic acid is improved when the calcium carbonate powder and the polylactic acid are blended, and the mechanical property of a polylactic acid material is improved. Meanwhile, the polyphenol structure introduced by modifying the calcium carbonate by the natural polyphenol compound can ensure that the composite material has good antioxidant and antibacterial properties. The polylactic acid composite material prepared by the method can be widely applied to the field of food packaging, such as preservative films, food bags, cutlery boxes and the like, and has wide market prospect.
The invention utilizes the structural properties of the natural polyphenol compound, namely the phenolic hydroxyl and the carboxyl, and the modified calcium carbonate powder is blended with the polylactic acid, so that the polylactic acid and the calcium carbonate powder have better compatibility, the production cost is reduced, the mechanical property of the composite material is improved, and the composite material has better antioxidant and antibacterial properties. Meanwhile, the polyphenol compound is an active ingredient of a natural medicinal material, is nontoxic and harmless, can be completely degraded together with polylactic acid, and has zero pollution. The invention utilizes the structural characteristics and functional characteristics of the polyphenol compounds, and obtains the polylactic acid composite material which has good antioxidant and antibacterial properties, good mechanical properties, environmental protection and complete degradation through a simple preparation process.
Detailed Description
The invention provides a preparation method of a biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material, which comprises the following steps:
1) Adding natural polyphenol compounds into calcium carbonate, mixing and modifying to obtain modified calcium carbonate;
2) Mixing modified calcium carbonate and polylactic acid, and sequentially carrying out melt blending and hot press molding to obtain the biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material;
the polyphenol compound comprises one or more of gallic acid, chlorogenic acid and baicalin.
In the present invention, the polyphenol compound is preferably gallic acid and/or chlorogenic acid, preferably gallic acid.
In the invention, the polyphenol compounds are all active ingredients of natural medicinal materials, are nontoxic and harmless, have polyphenol structures, and have the performances of antioxidation, antibiosis and the like.
In the present invention, the calcium carbonate was dried at 80 ℃ for 4 hours to eliminate moisture therein before mixing.
In the present invention, the amount of the natural polyphenol compound added is 0.5 to 5% by mass, preferably 1 to 4% by mass, and more preferably 2 to 3% by mass of calcium carbonate.
In the present invention, the particle size of the calcium carbonate is 2000 to 4000 mesh, preferably 2500 to 3500 mesh, and more preferably 3000 mesh.
In the present invention, in the step 1), the temperature of the mixing modification treatment is 300 to 350 ℃, preferably 310 to 340 ℃, and preferably 330 ℃; the time of the mixing modification treatment is 30-50 min, preferably 40min.
In the present invention, the amount of the modified calcium carbonate added is 10 to 50% by mass, preferably 20 to 40% by mass, and more preferably 30% by mass of the polylactic acid.
In the present invention, the content of poly-L-lactic acid in the polylactic acid is preferably not less than 98%.
In the present invention, the temperature of the melt blending is 140 to 180 ℃, preferably 150 to 170 ℃, and more preferably 160 ℃; the time for melt blending is 10 to 30 minutes, preferably 15 to 25 minutes, and more preferably 20 minutes.
In the invention, the temperature of the hot press molding is 150-170 ℃, preferably 160 ℃; the pressure of the hot press molding is 8-15 MPa, preferably 10-12 MPa.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
2800 mesh calcium carbonate was dried at 80 ℃ for 4 hours to eliminate moisture therein. Adding a certain amount of calcium carbonate into a high-speed stirrer, stirring at 300 ℃ for 10min, then adding 1% gallic acid, and continuously stirring for 30min to obtain calcium carbonate modified by natural polyphenols; premixing the obtained modified calcium carbonate and polylactic acid, wherein the adding amount of the modified calcium carbonate is 20% of the mass of the polylactic acid, adding the polylactic acid into a two-roll open mill for melt blending, and obtaining a blending product, wherein the melt blending temperature is 150 ℃ and the time is 20 min; the obtained blending product is hot-pressed and molded at 160 ℃ and 10MPa to obtain the biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material.
Example 2
2800 mesh calcium carbonate was dried at 80 ℃ for 4 hours to eliminate moisture therein. Adding a certain amount of calcium carbonate into a high-speed stirrer, stirring at 300 ℃ for 10min, then adding 2% chlorogenic acid, and continuously stirring for 30min to obtain calcium carbonate modified by natural polyphenols; premixing the obtained modified calcium carbonate and polylactic acid, wherein the adding amount of the modified calcium carbonate is 30% of the mass of the polylactic acid, adding the polylactic acid into a two-roll open mill for melt blending, and obtaining a blending product, wherein the melt blending temperature is 150 ℃ and the time is 20 min; the obtained blending product is hot-pressed and molded at 170 ℃ and 8MPa to obtain the biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material.
Example 3
2800 mesh calcium carbonate was dried at 80 ℃ for 4 hours to eliminate moisture therein. Adding a certain amount of calcium carbonate into a high-speed stirrer, stirring at 300 ℃ for 10min, then adding 3% of baicalin, and continuously stirring for 30min to obtain calcium carbonate modified by natural polyphenols; premixing the obtained modified calcium carbonate and polylactic acid, wherein the adding amount of the modified calcium carbonate is 40% of the mass of the polylactic acid, adding the polylactic acid into a two-roll open mill for melt blending, and obtaining a blending product, wherein the melt blending temperature is 150 ℃ and the time is 20 min; the obtained blending product is hot-pressed and molded at 150 ℃ and 15MPa to obtain the biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material.
Example 4
2800 mesh calcium carbonate was dried at 80 ℃ for 4 hours to eliminate moisture therein. Adding a certain amount of calcium carbonate into a high-speed stirrer, stirring at 300 ℃ for 10min, then adding 5% of gallic acid, and continuously stirring for 30min to obtain calcium carbonate modified by natural polyphenols; premixing the obtained modified calcium carbonate and polylactic acid, wherein the adding amount of the modified calcium carbonate is 20% of the mass of the polylactic acid, adding the polylactic acid into a two-roll open mill for melt blending, and obtaining a blending product, wherein the melt blending temperature is 150 ℃ and the time is 20 min; the obtained blending product is hot-pressed and molded at 160 ℃ and 15MPa to obtain the biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material.
The biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite materials obtained in the above examples 1 to 4 were respectively subjected to performance tests:
(1) Mechanical property test: the tensile strength and the elongation at break of the obtained composite material are tested according to GB/T1040.3-2006 standard, and the tensile speed is 50mm/min +/-10%; impact strength was measured on a tensile tester according to ASTM D638.
(2) And (3) oxidation resistance test: the oxidation resistance of the resulting composite was measured by characterization by DPPH radical scavenging rate.
(3) Antibacterial performance test: the antibacterial property of the obtained composite material is measured according to the standard GB/T20944.1-2007 by evaluating the in vitro antibacterial activity of E.coli by an agar diffusion method.
The test results are shown in table 1:
TABLE 1 mechanical Properties and antioxidant and antibacterial Properties of the composite Material
From the above embodiments, the invention provides a biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material and a preparation method thereof. The radical scavenging rate represents the oxidation resistance of the material, and the larger the value is, the better the oxidation resistance of the material is. From the results of the performance test described above, the addition of modified calcium carbonate powder resulted in some decrease in tensile strength of the resulting composite of examples 1-4, but less variation, compared to the pure PLA material. The elongation at break and the impact strength of the composite material are obviously improved, which indicates that the toughness of the composite material is obviously enhanced; meanwhile, the free radical clearance rate and the antibacterial rate of the composite material are both obviously improved, which shows that the composite material has better antioxidation and antibacterial properties, and compared with the examples 1-4, the antioxidation and antibacterial values of the composite material are obviously increased along with the increase of the content of the polyphenol compound in the composite material system, which is consistent with the stronger antioxidation and antibacterial properties of the polyphenol compound. Thus, the above test data can be combined to obtain: the natural polyphenol compound modified calcium carbonate is added into polylactic acid to obtain a composite material with toughening, strong antioxidation and antibacterial properties.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (9)
1. The preparation method of the biological environment-friendly toughened strong-antioxidant antibacterial polylactic acid composite material is characterized by comprising the following steps of:
1) Adding natural polyphenol compounds into calcium carbonate, mixing and modifying to obtain modified calcium carbonate;
2) Mixing modified calcium carbonate and polylactic acid, and sequentially carrying out melt blending and hot press molding to obtain the biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material;
the polyphenol compound comprises one or more of gallic acid, chlorogenic acid and baicalin.
2. The preparation method of the biological environment-friendly toughened strong antioxidant antibacterial polylactic acid composite material according to claim 1, wherein the addition amount of the natural polyphenol compound is 0.5-5% of the mass of calcium carbonate.
3. The method for preparing the biological environment-friendly toughened strong antioxidant and antibacterial polylactic acid composite material according to claim 1 or 2, wherein the particle size of the calcium carbonate is 2000-4000 meshes.
4. The method for preparing the biological environment-friendly toughened strong antioxidant and antibacterial polylactic acid composite material according to claim 3, wherein in the step 1), the temperature of the mixing modification treatment is 300-350 ℃, and the time of the mixing modification treatment is 30-50 min.
5. The method for preparing the biological environment-friendly toughened strong antioxidant and antibacterial polylactic acid composite material according to claim 1, 2 or 4, wherein the addition amount of the modified calcium carbonate is 10-50% of the mass of the polylactic acid.
6. The method for preparing the biological environment-friendly toughened strong-antioxidant antibacterial polylactic acid composite material according to claim 5, wherein the content of poly-L-lactic acid in the polylactic acid is not less than 98%.
7. The method for preparing the biological environment-friendly toughened strong antioxidant and antibacterial polylactic acid composite material according to claim 4 or 6, wherein the temperature of melt blending is 140-180 ℃, and the time of melt blending is 10-30 min.
8. The method for preparing the biological environment-friendly toughened strong antioxidant and antibacterial polylactic acid composite material according to claim 7, wherein the temperature of hot press molding is 150-170 ℃, and the pressure of hot press molding is 8-15 MPa.
9. The biological environment-friendly toughened, strong antioxidant and antibacterial polylactic acid composite material obtained by the preparation method of any one of claims 1-8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117822144A (en) * | 2023-12-28 | 2024-04-05 | 江南大学 | Chlorogenic acid-containing multifunctional polylactic acid textile and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117822144A (en) * | 2023-12-28 | 2024-04-05 | 江南大学 | Chlorogenic acid-containing multifunctional polylactic acid textile and preparation method thereof |
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