CN117430926A - PLA-PBAT composite material with enhanced synergistic effect and preparation method thereof - Google Patents
PLA-PBAT composite material with enhanced synergistic effect and preparation method thereof Download PDFInfo
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- 229920001896 polybutyrate Polymers 0.000 title claims abstract description 34
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 230000002195 synergetic effect Effects 0.000 title claims abstract description 13
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 239000004626 polylactic acid Substances 0.000 claims abstract description 36
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000002105 nanoparticle Substances 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 8
- -1 polybutylene adipate terephthalate Polymers 0.000 claims abstract description 8
- 239000000314 lubricant Substances 0.000 claims abstract description 5
- 239000004629 polybutylene adipate terephthalate Substances 0.000 claims abstract description 5
- 238000001125 extrusion Methods 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 14
- 239000004094 surface-active agent Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 9
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical group [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 8
- 239000008116 calcium stearate Substances 0.000 claims description 8
- 235000013539 calcium stearate Nutrition 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 230000035484 reaction time Effects 0.000 claims description 8
- 238000001291 vacuum drying Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 239000002086 nanomaterial Substances 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 5
- 238000002715 modification method Methods 0.000 claims description 4
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 208000034530 PLAA-associated neurodevelopmental disease Diseases 0.000 abstract description 13
- 230000005501 phase interface Effects 0.000 abstract description 5
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- 238000010899 nucleation Methods 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000006116 polymerization reaction Methods 0.000 abstract description 2
- 230000006355 external stress Effects 0.000 abstract 1
- 230000035882 stress Effects 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 52
- 229910000019 calcium carbonate Inorganic materials 0.000 description 26
- 238000003756 stirring Methods 0.000 description 12
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- 238000012986 modification Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
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- 238000010438 heat treatment Methods 0.000 description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
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- 230000009471 action Effects 0.000 description 2
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- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920002988 biodegradable polymer Polymers 0.000 description 1
- 239000004621 biodegradable polymer Substances 0.000 description 1
- 150000001718 carbodiimides Chemical class 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
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- 238000011049 filling Methods 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 229920005621 immiscible polymer blend Polymers 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- 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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/24—Crystallisation aids
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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 relates to a PLA-PBAT composite material with enhanced synergistic effect and a preparation method thereof. The raw material components and the mass parts of the components are respectively 30-35 parts of polylactic acid; 65-70 parts by mass of polybutylene adipate terephthalate; 1-3 parts by mass of compatibilizer; 0.3 to 1 mass part of modified nano particles; 0.2 to 0.4 part by mass of lubricant. The modified particles form new stable phase through nucleation to enhance the interfacial compatibility of PLA/PBAT materials and the chemical bonding chain extension polymerization of the reactive compatibilizer and PLA-PBAT. PCDI is taken as a main chain, PLA and PBAT are grafted on the main chain to form PLA-PCDI-PBAT copolymer which is taken as a base material, the interfacial adhesiveness of a phase interface is improved by PCDI reaction bonding, and then nano modified particles are further added to fill phase interface gaps to improve phase interface compatibility, so that the stress transfer efficiency of a disperse phase and a continuous phase is effectively improved when external stress is applied, and the mechanical property of the material is further improved.
Description
Technical Field
The invention belongs to the field of high polymer material modification processing, and particularly relates to a synergistic enhanced PLA-PBAT composite material and a preparation method thereof.
Technical Field
Polylactic acid (PLA) is a relatively common biodegradable polymer with excellent mechanical properties and biocompatibility, but its inherent toughness drawbacks limit its development and application. The most commonly used way of toughening and reinforcing is to add an elastic material to blend with it. But generally because of the difference in molecular chain structure between the two polymers, this results in poor compatibility between the two polymers. The polybutylene adipate-terephthalic acid copolymer (PBAT) combines the performance of an elastic material, has excellent biodegradability, endows PLA with good toughness, is a very promising material for toughening and modifying PLA, but also avoids the problem of poor compatibility. Therefore, how to improve the compatibility of PLA and PBAT blends is an urgent issue to be addressed.
Methods of improving the compatibility of immiscible PLA/PBAT blends using reactive blending have been widely studied. The chain extender and the free radical crosslinking agent which are used for chain extension through chemical reaction with PLA/PBAT are adopted to form the macromolecular copolymer PLA-g-PBAT, so that the interfacial adhesion of the PLA/PBAT material can be effectively enhanced, and the interfacial compatibility is improved. Nanoparticles (NPs) also contribute significantly in immiscible polymer blends. In the Hajin diffusion equation, NPs are dispersed at the phase interface or the phase inside of PLA/PBAT, and different particle dispersion conditions can cause the phase morphology of the composite material to be greatly changed so as to influence the performance of the material.
The combination of the reactive modifier and the micro-nano particles can generate a synergistic effect, and effectively improve the performance of the material. The epoxy castor oil used as the chain extension compatilizer of the composite material in combination with the calcium carbonate in the CN116675956A has better performance and interface compatibility improving effect on the overall material within a certain addition limit. Zhao XiOn the basis of research of compatibilizer ADR on PBAT/PLA, a carbon nano tube is further added into a slope (International Journal of Biological Macromolecules,2023, 250:126204.) and the like, the tensile strength of the PBAT/PLA material is further improved to 42.8MPa on the basis of 40.8MPa of ADR through the synergistic effect of the carbon nano tube and the ADR, and the impact strength is 29.6kJ/m 2 Lifting to 35.3kJ/m 2 . Thus, the synergistic effect of the micro-nano particles and the reactive compatibilizer can further improve the performance of the material.
Disclosure of Invention
The invention mainly aims to provide a PLA-PBAT composite material with synergistic effect, and another aim of the invention is to provide a preparation method of the PLA-PBAT composite material.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a synergistic enhanced PLA-PBAT composite, characterized by: the raw material comprises the following components in parts by mass:
preferably, the compatibilizer is a polycondensate PCDI of polycarbodiimide.
Preferably, the modified nanoparticle is a CaCO modified by a surfactant 3 Wherein the surfactant is a silane coupling agent KH550.
Preferably, the lubricant is calcium stearate.
The invention also provides a method for preparing the PLA-PBAT composite material, which comprises the following specific steps:
a, modifying the nano particles by using a surfactant;
weighing polylactic acid and polybutylene adipate terephthalate, and drying in a vacuum drying oven; and then uniformly mixing the dried polylactic acid and polybutylene terephthalate, the compatibilizer, the modified particles and the lubricant in a high-speed mixer, putting into a feeding funnel of a double-screw extruder, carrying out melt blending by adopting the double-screw extruder, carrying out extrusion molding, cooling, drying and granulating to obtain the PLA-PBAT composite material.
The modification method of the preferred step A is as follows: the mass ratio of the surfactant to the nano material is 2-3%, the nano material is added into a container, stirred and heated in an oil bath, wherein the rotating speed is 400-500 r/min, the temperature is set to 60-80 ℃, and the reaction time is 30-40 minutes, so that the required modified nano material is obtained. The modification method of nano calcium carbonate refers to patent CN 108102141A.
Preferably, the melt blending in the step B is co-rotating twin-screw blending extrusion, and the extrusion temperature is 180-190 ℃.
B, preferably, the drying temperature of the vacuum drying oven in the step B is 60-80 ℃, and the vacuum drying oven is dried for 8-12 hours; the mass percentage concentration of the moisture of the dried raw materials of polylactic acid and polybutylene adipate-terephthalate is between 0.3 percent and 1.5 percent.
The length-diameter ratio of the screw of the double screw extruder is generally (40-48) 1, the melt blending temperature is 180-190 ℃, and the rotating speed is set to 150r/min.
The beneficial effects are that: compared with the prior art, the modification method has the following advantages:
PCDI is used as an active carboxyl end chain extender, can fully react with carboxyl end groups on PBAT and PLA chains in situ to generate a PBAT-b-PLA-like copolymerized macromolecular chain, and the PLA and the PBAT are connected to a PCDI main chain so as to improve the molecular weight of the PLA-PBAT blend, thereby improving the material performance. And PCDI as a polycondensate of carbodiimide can adjust the polymerization of new materials by adjusting the molecular weight of PCDI.
2. Nano CaCO 3 The price is low, the crystallization performance of the PLA material can be improved through heterogeneous nucleation, a new stable phase is generated in a PLA-PBAT system in a metastable system, the PLA-PBAT composite material has toughening and reinforcing effects, and the PLA-PBAT composite material is a filler which is inorganic rigid particles and can improve the rigidity and toughness of the material. It can produce further synergy with PCDI after filling the interface, further enhancing two-phase adhesion at PLA and PBAT interfaces, increasing interfacial adhesion and the ability to dissipate energy and transfer stress.
Drawings
FIG. 1 is a SEM image of the notched face of the PLA-PBAT blend at the ratio of comparative example 4 (a), the PLA-PBAT blend at the ratio of comparative example 1 (b), the PLA-PBAT blend at the ratio of example 1 (d), and the PLA-PBAT blend at the ratio of example 5 (c).
Detailed Description
The present invention will be described with reference to specific examples, but the present invention is not limited to the examples. The raw material PBAT (brand TH 801T) has a melt index of 7.0-8.3 g/10min (190 ℃/2.16 kg); PLA (4032D) with a melt index of 6-11 g/10min (190 ℃/2.16 kg).
Example 1
The modification process of nano calcium carbonate comprises the following steps: according to the mass ratio of 2%, adding nano calcium carbonate and a silane coupling agent KH-550 into a three-neck flask, stirring and heating in an oil bath, wherein the rotation speed of a stirring paddle is 450r/min, the temperature is set to 60 ℃, and the reaction time is 30 minutes, so that the modified nano calcium carbonate can be obtained.
The PLA and PBAT raw materials were dried in a vacuum oven at 80℃for 12 hours with a moisture content of 0.3%. Weighing 30 parts by mass of PLA, 70 parts by mass of PBAT, 0.5 part by mass of modified nano calcium carbonate, 2 parts by mass of PCDI and 0.2 part by mass of calcium stearate, putting the ingredients into a high-speed mixer, uniformly mixing, putting into a feeding hopper of a double-screw extruder, setting a screw rod to be 150r/min during extrusion and granulation, setting the length-diameter ratio of the extruder screw rod to be 40:1, blending and extrusion temperature to be 180 ℃, slightly cooling an extrusion material brace by cooling water, cooling and blow-drying by a blower, and granulating and forming by a granulator to obtain the PLA-PBAT composite material.
Example 2
The modification process of nano calcium carbonate comprises the following steps: according to the mass ratio of 2.5 percent, adding nano calcium carbonate and a silane coupling agent KH-550 into a three-neck flask, stirring and heating in an oil bath, wherein the rotating speed of a stirring paddle is 500r/min, the temperature is set to 80 ℃, and the reaction time is 30 minutes, so that the modified nano calcium carbonate can be obtained.
And drying the PLA and PBAT raw materials for 8 hours at the temperature of 60 ℃ in a vacuum drying oven, wherein the water content is 0.65%. Weighing 35 parts by mass of PLA, 65 parts by mass of PBAT, 0.3 part by mass of modified nano calcium carbonate, 2 parts by mass of PCDI and 0.2 part by mass of calcium stearate, putting the ingredients into a high-speed mixer, uniformly mixing, putting into a feeding hopper of a double-screw extruder, setting a screw rod to be 150r/min during extrusion and granulation, setting the length-diameter ratio of the extruder screw rod to be 40:1, blending and extrusion temperature to be 180 ℃, slightly cooling an extrusion material brace by cooling water, cooling and blow-drying by a blower, and granulating and forming by a granulator to obtain the PLA-PBAT composite material.
Example 3
The modification process of nano calcium carbonate comprises the following steps: according to the mass ratio of 3%, adding nano calcium carbonate and a silane coupling agent KH-550 into a three-neck flask, stirring and heating in an oil bath, wherein the rotation speed of a stirring paddle is 400r/min, the temperature is set to 60 ℃, and the reaction time is 40 minutes, so that the modified nano calcium carbonate can be obtained.
The PLA and PBAT raw materials are dried for 12 hours in a vacuum drying oven at 60 ℃, and the water content is 0.88 percent. Weighing 30 parts by mass of PLA, 70 parts by mass of PBAT, 0.5 part by mass of modified nano calcium carbonate, 1 part by mass of PCDI and 0.4 part by mass of calcium stearate, putting the ingredients into a high-speed mixer, uniformly mixing, putting the ingredients into a feeding hopper of a double-screw extruder, setting a screw rod to be 150r/min during extrusion and granulation, setting the length-diameter ratio of the extruder screw rod to be 40:1, blending and extrusion temperature to be 190 ℃, cooling an extrusion material brace slightly by cooling water, cooling and blow-drying by a fan, and granulating and forming by a granulator to obtain the PLA-PBAT composite material.
Example 4
The modification process of nano calcium carbonate comprises the following steps: according to the mass ratio of 2%, adding nano calcium carbonate and a silane coupling agent KH-550 into a three-neck flask, stirring and heating in an oil bath, wherein the rotation speed of a stirring paddle is 400r/min, the temperature is set to 80 ℃, and the reaction time is 30 minutes, so that the modified nano calcium carbonate can be obtained.
The PLA and PBAT raw materials were dried in a vacuum oven at 80deg.C for 8h with a water content of 1.1%. 30 parts by mass of PLA, 70 parts by mass of PBAT, 1 part by mass of nano calcium carbonate, 3 parts by mass of PCDI and 0.4 part by mass of calcium stearate are weighed, then the ingredients are put into a high-speed mixer to be mixed uniformly, and then are put into a feeding hopper of a double-screw extruder, the screw is set to 150r/min during extrusion and granulation, the length-diameter ratio of the extruder screw is 40:1, the blending extrusion temperature is 190 ℃, and the extrusion material bracing piece is cooled slightly by cooling water and dried by a blower fan, and then is granulated and molded by a granulator, so that the PLA-PBAT composite material can be obtained.
Example 5
The modification process of nano calcium carbonate comprises the following steps: according to the mass ratio of 2%, adding nano calcium carbonate and a silane coupling agent KH-550 into a three-neck flask, stirring and heating in an oil bath, wherein the rotation speed of a stirring paddle is 400r/min, the temperature is set to 80 ℃, and the reaction time is 30 minutes, so that the modified nano calcium carbonate can be obtained.
The PLA and PBAT raw materials were dried in a vacuum oven at 80℃for 12 hours with a water content of 1.5%. Weighing 30 parts by mass of PLA, 70 parts by mass of PBAT, 0.5 part by mass of modified nano calcium carbonate, 3 parts by mass of PCDI and 0.2 part by mass of calcium stearate, putting the ingredients into a high-speed mixer, uniformly mixing, putting into a feeding hopper of a double-screw extruder, setting a screw rod to be 150r/min during extrusion and granulation, setting the length-diameter ratio of the extruder screw rod to be 40:1, blending and extrusion temperature to be 180 ℃, slightly cooling an extrusion material brace by cooling water, cooling and blow-drying by a blower, and granulating and forming by a granulator to obtain the PLA-PBAT composite material.
Comparative example 1
The modification process of nano calcium carbonate comprises the following steps: according to the mass ratio of 3%, adding nano calcium carbonate and a silane coupling agent KH-550 into a three-neck flask, stirring and heating in an oil bath, wherein the rotation speed of a stirring paddle is 400r/min, the temperature is set to 60 ℃, and the reaction time is 40 minutes, so that the modified nano calcium carbonate can be obtained.
The PLA and PBAT raw materials were dried in a vacuum oven at 80℃for 12 hours with a water content of 0.5%. Weighing 30 parts by mass of PLA, 70 parts by mass of PBAT, 0.5 part by mass of nano calcium carbonate and 0.4 part by mass of calcium stearate, putting the ingredients into a high-speed mixer, uniformly mixing, putting into a feeding hopper of a double-screw extruder, setting a screw to be 150r/min during extrusion granulation, setting the length-diameter ratio of the extruder screw to be 40:1, blending and extrusion at 180 ℃, slightly cooling an extrusion material brace by cooling water, cooling and blow-drying by a blower, and granulating and forming by a granulator to obtain the PLA/PBAT composite material.
Comparative example 2
The difference from comparative example 1 is that forNano CaCO 3 Different surfactants, sodium dodecyl sulfate as surfactant is used for modifying nano CaCO 3 。
Comparative example 3
The difference from comparative example 1 is that for nano CaCO 3 Different surfactants, the surfactant stearic acid is used for modifying nano CaCO 3 。
Comparative example 4
And (3) drying the PLA and PBAT raw materials in a vacuum drying oven at 80 ℃ for 12 hours, wherein the water content is 1%. Weighing 30 parts by mass of PLA and 70 parts by mass of PBAT, putting the ingredients into a high-speed mixer to be mixed uniformly, putting the mixture into a feeding hopper of a double-screw extruder, setting a screw rod to be 150r/min during extrusion and granulation, setting the length-diameter ratio of the extruder screw rod to be 40:1, blending and extrusion temperature to be 180 ℃, slightly cooling an extrusion material brace by cooling water, cooling and blow-drying by a fan, and granulating and forming by a granulator to obtain the PLA/PBAT composite material.
The invention performs mechanical property test and tensile test on the PBAT-PLA materials obtained in the examples 1-5 and the comparative examples 1-4, and measures the tensile according to the national standards GB/T17037.2-2020 and GB/T17037.3-2003, and the international standard ISO 179-1 measures the impact energy to characterize the technical effects of the invention. The test results were as follows:
the test data result indicated above shows that:
(1) From the mechanical property test data of examples 1-5 and comparative examples 1-4, it is known that in the modified PBAT-PLA material of the present invention, the increase in PLA addition can enhance the rigidity of the material, and the increase in PBAT content can enhance the toughness of the material. The use of different surfactants has a great influence on the overall synergistic effect, and the silane coupling agent KH550 adopted by the invention has the best action effect.
(2) The properties of the PBAT-PLA material with the modified nanoparticles alone were increased from 27.563MPa (comparative example 4) to 30.041MPa. After the method of combining the modified particles and the compatibilizer PCDI is adopted, the mechanical properties of the PBAT-PLA material can reach 37.256MPa and 826.436 percent respectively, and the impact strength of the PBAT-PLA material reaches 47MPa in the embodiment 1, because a more stable phase interface structure and interface compatibility are formed under the combined action of a bond-forming chain-extending effect and a particle nucleation effect, so that the dispersion and the transfer of external force are more effective. As shown in (c) and (d) of FIG. 1, the SEM image phase structure of PLA/PBAT incision surface under the synergistic effect is distributed continuously, and the connectivity is good.
(3) The above measurement also shows that PCDI acts as an active terminal carboxyl chain extender and can react with the terminal carboxyl groups on the PBAT and PLA chains in situ during melt blending, and the PLA and PBAT are connected to the PCDI main chain, so that the molecular weight of the PLA-PBAT blend is improved, and the material performance is improved. And plays a role in further optimization under the synergistic effect of further adding inorganic particles. The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and the scope of the present invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A synergistic enhanced PLA-PBAT composite, characterized by: the raw material comprises the following components in parts by mass:
2. the PLA-PBAT composite of claim 1, wherein: the compatibilizer is a polycondensate PCDI of polycarbodiimide.
3. The PLA-PBAT composite of claim 1, wherein: the modified nano particles are CaCO modified by a surfactant 3 Wherein the surfactant is a silane coupling agent KH550.
4. The PLA-PBAT composite of claim 1, wherein: the lubricant is calcium stearate.
5. A method of making the PLA-PBAT composite of claim 1, comprising the steps of: a, modifying the nano particles by using a surfactant;
weighing polylactic acid and polybutylene adipate terephthalate, and drying in a vacuum drying oven; and then uniformly mixing the dried polylactic acid and polybutylene terephthalate, the compatibilizer, the modified particles and the lubricant in a high-speed mixer, then putting into a feed hopper of a double-screw extruder, carrying out melt blending by adopting the double-screw extruder, carrying out extrusion molding, cooling, drying and granulating to obtain the PLA-PBAT composite material.
6. The method of claim 4, wherein: the modification method in the step A comprises the following steps: the mass ratio of the surfactant to the nano material is 2-3%, the nano material is added into a container, stirred and heated in an oil bath, wherein the rotating speed is 400-500 r/min, the temperature is set to 60-80 ℃, and the reaction time is 30-40 minutes, so that the required modified nano material is obtained.
7. The method of claim 4, wherein: and B, the melt blending is co-rotating twin-screw blending extrusion, and the extrusion temperature is 180-190 ℃.
8. The method of claim 4, wherein: b, drying the materials in the vacuum drying oven at the temperature of 60-80 ℃ for 8-12 h; the mass percentage concentration of the moisture of the dried raw materials of polylactic acid and polybutylene adipate-terephthalate is between 0.3 percent and 1.5 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311588110.XA CN117430926A (en) | 2023-11-27 | 2023-11-27 | PLA-PBAT composite material with enhanced synergistic effect and preparation method thereof |
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