CN114854181A - High-strength PBAT-PLA alloy material for external packaging and preparation method thereof - Google Patents
High-strength PBAT-PLA alloy material for external packaging and preparation method thereof Download PDFInfo
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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
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- 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
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- 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
-
- 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 relates to a high-strength PBAT-PLA alloy material for external packaging and a preparation method thereof, wherein the preparation method comprises the following steps: weighing 65-85 parts of dried PBAT, 10-30 parts of dried PLA, 5-15 parts of modified nano material, 0.3-0.6 part of chain extender, 0.1-0.2 part of coupling agent, 0.2-0.4 part of antioxidant and 1-2 parts of lubricant, uniformly mixing the components by a high-speed mixer, and conveying the mixture to a double-screw feeding hopper; the PBAT/PLA alloy material with high strength and full degradation is obtained by twin-screw extrusion granulation and drying. The processing production process of the alloy material is simple, the process is stable, the cost is low, the modified nano material is uniformly dispersed in the alloy material, the compatibility of the modified nano material and the alloy material is good, the modified nano material has excellent comprehensive performance, the modified nano material and the chain extender have a synergistic enhancement effect, and the modified nano material has wide application prospects in the fields of external packaging, films and the like.
Description
Technical Field
The invention relates to a high-strength PBAT-PLA alloy material for external packaging and a preparation method thereof, belonging to the technical field of polymer modification processing.
Technical Field
In recent years, the damage of the non-degradable polymer material to the ecological environment has attracted much attention, and with the emergence and development of the biodegradable polymer material, more and more researches are focused on improving the performance of the degradable material to meet the market demand. PLA, of which the technology is mature, occupies a considerable portion of the market, however the inherent brittleness of PLA itself limits its application. PBAT rapidly becomes an ideal material for toughening PLA, benefiting from the cost advantage of upstream raw materials, the maturity of synthetic technology and excellent biodegradability.
However, PBAT and PLA are two-phase incompatible systems, and simple blending extrusion cannot achieve the target performance, so that the applications of PBAT/PLA alloy materials in the daily field, especially packaging materials, must be ensured by improving the compatibility of the two phases or improving the interfacial bond strength of the two.
CN 111944287A discloses a preparation method of a high-transparency easy-tearing polylactic acid blown film, PBAT is used as a toughening agent, acetyl tri-n-butyl citrate is used as a plasticizer, and white carbon black is used as a nucleating agent, and the film is prepared by a blending method and aims to replace the traditional PE and PP films. CN 113861636A takes the calcium carbonate whisker of high aspect ratio as the packing, with the help of its own extreme high strength and aspect ratio, can obviously improve the strength and the deflection of PBAT/PLA alloy material. CN 113801350A prepares PLA-g-GMA through graft modification, and the PLA-g-GMA is used as a compatilizer to promote the interfacial bonding force of PBAT/PLA two phases, so that the mechanical property of the material is enhanced, and in addition, the added calcium carbonate plays a role of a nucleating agent and is beneficial to the crystallization of PBAT and PLA.
Although the PBAT/PLA alloy is prepared by the method and can be used for packaging materials, the phase separation phenomenon still exists in the two-phase interface of the PBAT/PLA alloy, the physical property of the alloy material is weaker, the application range of the alloy material is limited, and the method has the defects of high cost, complex process and the like, and is not beneficial to popularization and application of the PBAT/PLA alloy material.
Disclosure of Invention
The invention aims to provide a high-strength PBAT-PLA alloy material for external packaging, and the invention also aims to provide a preparation method of the high-strength PBAT-PLA alloy material, which greatly improves the crystallization speed and the crystallinity of the alloy material through the synergistic effect of chemical chain extension branching and physical nucleation, and is beneficial to the homogenization of a two-phase interface, so that the melt strength of the alloy material is improved, and the macroscopic expression is the improvement of the comprehensive mechanical property of the alloy material.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention has the technical advantages that: the surface treatment is carried out on the nano hydrotalcite by a coupling agent, the coupling agent is firstly hydrolyzed into silanol, then the silanol reacts with hydroxyl on the surface of nano powder particles to form hydrogen bonds and is condensed into-Si-M covalent bonds (M represents the surface of nano material particles), and simultaneously, association oligomerization is carried out among the silanol to form a film with a network structure to cover the surface of the particles, so that the inorganic particles are organized.
The invention has the following technical advantages: the chain extender such as an anhydride group on a styrene-maleic anhydride copolymer (SMA) can perform esterification reaction with terminal hydroxyl groups on PBAT and PLA to form a branched molecular structure, so that the molecular weight and the melt strength of the PBAT and the PLA are improved, and the compatibility of the PBAT and the PLA is effectively improved.
The invention has the following technical advantages: the nano-hydrotalcite surface-modified by the coupling agent can be uniformly distributed in the PBAT/PLA base material, meanwhile, the epoxy group of the coupling agent can continuously react with the unesterified terminal hydroxyl groups of the PBAT and the PLA to form a micro-crosslinking network, so that the binding force of the nano-hydrotalcite in the base material is enhanced, a strong sea-island distribution structure is formed, and the energy of the alloy material subjected to external stress is effectively slowly released.
The invention has the fourth technical advantage that: the nano hydrotalcite is an inorganic material with a special layered structure, and the intercalation property and the interlayer ion exchangeability of the nano hydrotalcite under the action of strong polar molecules can introduce substrate molecules into interlayer gaps, so that the crystallization center is increased, the heterogeneous nucleation effect is achieved, and the light transmittance and the mechanical property of the alloy material are improved.
The specific technical scheme of the invention is as follows: a high-strength PBAT-PLA alloy material which can be used for external packaging is characterized in that: the components and the parts by weight of each component are respectively as follows:
preferably, the PBAT is selected from blown film grade, and the density is 1.2-1.24 g/cm 3 The melt index is 4.5-5.5 g/10min (190 ℃/2.16 kg); the PLA is selected from blown film grade, and the density is 1.2-1.3 g/cm 3 The melt index is 2-10 g/10min (190 ℃/2.16 kg).
Preferably, the modified nano material is one or more of modified nano hydrotalcite, modified nano silicon dioxide or modified nano calcium carbonate; the grafting rate of the modified nano material subjected to surface modification is 0.8-1.5%.
Preferably, the chain extender is one or more of multifunctional epoxy oligomer (ADR-4370S), epoxy polymer chain extender (SAG-008) and styrene-maleic anhydride copolymer (SMA).
Preferably, the coupling agent is one or a plurality of compounds of gamma-aminopropyl triethoxysilane (KH-550), gamma-glycidoxypropyl trimethoxysilane (KH-560) or gamma-methacryloxypropyl trimethoxysilane (KH-570).
Preferably, the lubricant is one or a mixture of more of N, N' -Ethylene Bis Stearamide (EBS), calcium stearate, oleamide or polyethylene wax; the antioxidant is one or a plurality of antioxidant 1010, antioxidant 168, antioxidant 1098 or antioxidant 245.
The invention also provides a method for preparing the high-strength PBAT-PLA alloy material, which comprises the following steps: weighing 65-85 parts by weight of dry PBAT, 10-30 parts by weight of dry PLA, 5-15 parts by weight of dry modified nano material, 0.3-0.6 part by weight of chain extender, 0.1-0.2 part by weight of coupling agent, 0.2-0.4 part by weight of antioxidant and 1-2 parts by weight of lubricant, uniformly mixing by a high-speed mixer, pouring into a feeding hopper of a double-screw extruder, and performing double-screw melting, extrusion, cooling and granulation to obtain the high-strength PBAT-PLA alloy material for external packaging.
The modification method of the modified nano material refers to patents CN 108102141 a, CN 103772746a and the like, and the specific modification method comprises the following steps: the mass ratio of the coupling agent to the nano material is 1-2%, the modification equipment is selected to be a high-speed mixer, the rotating speed is 400-500 r/min, the temperature is set to be 70-80 ℃, the reaction time is 20-30 minutes, the required modified nano material is obtained, and the grafting rate of the modified nano material is 0.8-1.5%.
The PBAT, the PLA and the modified nano powder are dried for about 10 to 12 hours at the temperature of 75 to 85 ℃ generally, and the water in the PBAT, the PLA and the modified nano powder is removed.
The length-diameter ratio of the screws of the double-screw extruder is generally (40-48): 1, the temperature range from the zone 1 to the head is set to be 120-150 ℃, and the rotating speed is set to be 300-450 r/min.
The drying temperature of the twin-screw extrusion cooling granulation is 70-80 ℃, and the drying is carried out for 1-2 hours under the temperature environment condition.
Compared with the prior PBAT/PLA alloy material technology, the invention has the following advantages:
the processing and production process of the PBAT/PLA alloy material is simple, the process is stable, the cost is low, the compatibility of the PBAT and the PLA is good under the synergistic effect of chemical chain extension and physical nucleation, the comprehensive performance is excellent, the application field of the PBAT/PLA alloy is greatly widened, and the PBAT/PLA alloy material has wide application prospects in the fields of medical treatment, automobile accessories, tableware and the like.
Drawings
FIG. 1 is a diagram of an actual process for pelletizing a PBAT/PLA alloy;
table 1 shows the tensile properties data for the examples;
Detailed Description
The present invention will be described below with reference to specific examples, but the present invention is not limited theretoIn these embodiments. The PBAT described in the following examples is selected from blown film grade, and the density is 1.2-1.24 g/cm 3 The melt index is 4.5-5.5 g/10min (190 ℃/2.16 kg); the PLA is selected from blown film grade, and the density is 1.2-1.3 g/cm 3 The melt index is 2-10 g/10min (190 ℃/2.16 kg).
Example 1
The nano hydrotalcite modification process comprises the following steps: adding the nano-hydrotalcite and a silane coupling agent KH-560 into a high-speed mixer according to the mass ratio of 1%, wherein the particle size of the nano-hydrotalcite is 20 nanometers, the rotating speed of the mixer is 400r/min, the temperature is set to 80 ℃, and the reaction time is 20 minutes, so that the modified nano-hydrotalcite can be obtained, and the grafting ratio of the modified nano-material is 0.8%.
The implementation process comprises the following steps: drying PBAT (TH801T), PLA (REVODE190) and the modified nano hydrotalcite at 80 ℃ for 10 hours to remove water. Then, uniformly mixing 85 parts of dried PBAT (TH801T), 10 parts of PLA (REVODE190), 5 parts of modified hydrotalcite, 0.3 part of SMA, 0.1 part of KH-560, 0.2 part of composite antioxidant (1010:168 ═ 1:1) and 1 part of lubricant (EBS: calcium stearate ═ 1:1), adding the mixture into a double-screw feeding hopper, setting the screw rotation speed during extrusion granulation to be 300r/min, and setting the screw length-diameter ratio of an extruder to be 40: 1, setting the temperature from each machine barrel to the machine head to 120 ℃, 130 ℃, 140 ℃, 150 ℃ and 140 ℃, cooling by a water tank, and bracing and dicing to obtain the high-strength fully-degradable PBAT/PLA alloy material.
Drying the prepared PBAT/PLA alloy material for 1 hour at the temperature of 80 ℃, then preparing a sample strip on an injection molding machine, setting the injection molding temperature to be 300 ℃, and characterizing the related performance of the sample strip.
Example 2.
The nano hydrotalcite modification process comprises the following steps: adding the nano-hydrotalcite and a silane coupling agent KH-560 into a high-speed mixer according to the mass ratio of 1.2%, wherein the particle size of the nano-hydrotalcite is 30 nm, the rotating speed of the mixer is 450r/min, the temperature is set to 75 ℃, and the reaction time is 20 minutes, so that the modified nano-hydrotalcite can be obtained, and the grafting ratio of the modified nano-material is 1%.
The implementation process comprises the following steps: drying PBAT (TH801T), PLA (REVODE190) and the modified nano hydrotalcite at 80 ℃ for 10 hours to remove water. Then, uniformly mixing 70 parts of dried PBAT (TH801T), 20 parts of PLA (REVODE190), 10 parts of modified hydrotalcite, 0.3 part of SMA, 0.1 part of KH-560, 0.2 part of composite antioxidant (1010:168 ═ 1:1) and 1 part of lubricant (EBS: calcium stearate ═ 1:1), adding the mixture into a double-screw feeding hopper, setting the screw rotation speed during extrusion granulation to be 300r/min, and setting the screw length-diameter ratio of an extruder to be 45: 1, setting the temperature from each machine barrel to the machine head to 120 ℃, 130 ℃, 140 ℃, 150 ℃ and 140 ℃, cooling by a water tank, and bracing and dicing to obtain the high-strength fully-degradable PBAT/PLA alloy material.
Drying the prepared PBAT/PLA alloy material for 1 hour at the temperature of 80 ℃, then preparing a sample strip on an injection molding machine, setting the injection molding temperature to be 300 ℃, and characterizing the related performance of the sample strip.
Example 3
The nano hydrotalcite modification process comprises the following steps: adding the nano-hydrotalcite and a silane coupling agent KH-560 into a high-speed mixer according to the mass ratio of 1.5%, wherein the particle size of the nano-hydrotalcite is 50 nanometers, the rotating speed of the mixer is 500r/min, the temperature is set to 80 ℃, and the reaction time is 20 minutes, so that the modified nano-hydrotalcite can be obtained, and the grafting ratio of the modified nano-material is 1.2%.
The implementation process comprises the following steps: drying PBAT (TH801T), PLA (REVODE190) and the modified nano hydrotalcite at 80 ℃ for 10 hours to remove water. Then, uniformly mixing 75 parts of dried PBAT (TH801T), 10 parts of PLA (REVODE190), 15 parts of modified hydrotalcite, 0.4 part of SMA, 0.15 part of KH-560, 0.3 part of antioxidant (1098) and 1.5 parts of lubricant (EBS: calcium stearate 1:1), adding the mixture into a double-screw feeding hopper, setting the screw rotation speed during extrusion granulation to be 300r/min, and setting the length-diameter ratio of the screw of an extruder to be 40: 1, setting the temperature from each machine barrel to the machine head to 120 ℃, 130 ℃, 140 ℃, 150 ℃ and 140 ℃, cooling by a water tank, and bracing and dicing to obtain the high-strength fully-degradable PBAT/PLA alloy material.
Drying the prepared PBAT/PLA alloy material for 2 hours at 70 ℃, then preparing a sample strip on an injection molding machine, setting the injection molding temperature to be 300 ℃, and characterizing the related performance of the sample strip.
Example 4
The nano hydrotalcite modification process comprises the following steps: adding the nano hydrotalcite and a silane coupling agent KH-560 into a high-speed mixer according to the mass ratio of 2%, wherein the particle size of the nano hydrotalcite is 40 nm, the rotating speed of the mixer is 450r/min, the temperature is set to 75 ℃, and the reaction time is 20 minutes, so that the modified nano hydrotalcite can be obtained, and the grafting ratio of the modified nano material is 1.5%.
The implementation process comprises the following steps: drying PBAT (TH801T), PLA (REVODE190) and the modified nano hydrotalcite at 80 ℃ for 10 hours to remove water. Then, uniformly mixing 70 parts of dried PBAT (TH801T), 15 parts of PLA (REVODE190), 15 parts of modified hydrotalcite, 0.5 part of SMA, 0.15 part of KH-560, 0.3 part of antioxidant (245) and 1.5 parts of lubricant (EBS: calcium stearate 1:1), adding the mixture into a double-screw feeding hopper, setting the rotating speed of a screw during extrusion granulation to be 300r/min, and setting the length-diameter ratio of the screw of an extruder to be 40: 1, setting the temperature from each machine barrel to the machine head to 120 ℃, 130 ℃, 140 ℃, 150 ℃ and 140 ℃, cooling by a water tank, and bracing and dicing to obtain the high-strength fully-degradable PBAT/PLA alloy material.
Drying the prepared PBAT/PLA alloy material for 2 hours in an environment of 70 ℃, then preparing a sample strip on an injection molding machine, setting the injection molding temperature to be 300 ℃, and characterizing the related performance of the sample strip.
Example 5
The nano calcium carbonate modification process comprises the following steps: adding the nano calcium carbonate and a silane coupling agent KH-560 into a high-speed mixer according to the mass ratio of 1%, wherein the particle size of the nano calcium carbonate is 20 nanometers, the rotating speed of the mixer is 400r/min, the temperature is set to 70 ℃, and the reaction time is 30 minutes, so as to obtain the modified nano calcium carbonate, and the grafting ratio of the modified nano material is 0.8%.
The implementation process comprises the following steps: drying PBAT (TH801T), PLA (REVODE190) and the modified nano hydrotalcite at 85 ℃ for 10 hours to remove water. Then, uniformly mixing 75 parts of dried PBAT (TH801T), 15 parts of PLA (REVODE190), 10 parts of modified calcium carbonate, 0.6 part of SMA, 0.2 part of KH-560, 0.4 part of composite antioxidant (1010:168 is 1:1) and 2 parts of lubricant (polyethylene wax), adding the mixture into a double-screw feeding hopper, setting the rotating speed of a screw during extrusion granulation to be 300r/min, and setting the length-diameter ratio of the screw of an extruder to be 48: 1, setting the temperature from each machine barrel to the machine head to 120 ℃, 130 ℃, 140 ℃, 150 ℃ and 140 ℃, cooling by a water tank, and bracing and dicing to obtain the high-strength fully-degradable PBAT/PLA alloy material.
Drying the prepared PBAT/PLA alloy material for 1 hour at the temperature of 80 ℃, then preparing a sample strip on an injection molding machine, setting the injection molding temperature to be 300 ℃, and characterizing the related performance of the sample strip.
Example 6
The nano calcium carbonate modification process comprises the following steps: adding the nano calcium carbonate and a silane coupling agent KH-560 into a high-speed mixer according to the mass ratio of 2%, wherein the particle size of the nano calcium carbonate is 50 nanometers, the rotating speed of the mixer is 500r/min, the temperature is set to 80 ℃, and the reaction time is 20 minutes, so that the modified nano calcium carbonate can be obtained, and the grafting ratio of the modified nano material is 1.5%.
The implementation process comprises the following steps: drying PBAT (TH801T), PLA (REVODE190) and the modified nano hydrotalcite at 80 ℃ for 10 hours to remove water. Then, uniformly mixing 65 parts of dried PBAT (TH801T), 30 parts of PLA (REVODE190), 5 parts of modified calcium carbonate, 0.6 part of SMA, 0.2 part of KH-560, 0.4 part of composite antioxidant (1010:168 is 1:1) and 2 parts of lubricant (oleamide), adding the mixture into a double-screw feeding hopper, setting the screw rotation speed during extrusion granulation to be 300r/min, and setting the length-diameter ratio of a screw of an extruder to be 48: 1, setting the temperature from each machine barrel to the machine head to 120 ℃, 130 ℃, 140 ℃, 150 ℃ and 140 ℃, cooling by a water tank, and bracing and dicing to obtain the high-strength fully-degradable PBAT/PLA alloy material.
Drying the prepared PBAT/PLA alloy material for 1 hour at the temperature of 80 ℃, then preparing a sample strip on an injection molding machine, setting the injection molding temperature to be 300 ℃, and characterizing the related performance of the sample strip.
Example 7
Nano silicon dioxide: adding nano-silica and a silane coupling agent KH-550 into a high-speed mixer according to the mass ratio of 1%, wherein the particle size of the nano-silica is 20 nanometers, the rotating speed of the mixer is 450r/min, the temperature is set to be 70 ℃, and the reaction time is 30 minutes, so that the modified nano-silica can be obtained, and the grafting ratio of the modified nano-material is 0.9%.
Drying PBAT (TH801T), PLA (REVODE190) and the modified nano hydrotalcite at 80 ℃ for 10 hours to remove water. And then, uniformly mixing 85 parts of dried PBAT (TH801T), 10 parts of PLA (REVODE190), 5 parts of modified silicon dioxide, 0.3 part of ADR-4370S, 0.1 part of KH-550, 0.2 part of composite antioxidant (1010: 168: 1) and 1 part of lubricant (EBS: calcium stearate: 1), adding the mixture into a double-screw feeding hopper, setting the screw rotation speed during extrusion granulation to be 300r/min, setting the temperatures from the machine barrels to the machine head to be 120 ℃, 130 ℃, 140 ℃, 150 ℃ and 140 ℃, cooling by a water tank, drawing and cutting into granules, thus obtaining the high-strength fully degradable PBAT/PLA alloy material.
Drying the prepared PBAT/PLA alloy material for 1 hour at the temperature of 80 ℃, then preparing a sample strip on an injection molding machine, setting the injection molding temperature to be 300 ℃, and characterizing the related performance of the sample strip.
Example 8
The nano silicon dioxide modification process comprises the following steps: according to the mass ratio of 2%, adding the nano-silica and the silane coupling agent KH-570 into a high-speed mixer, wherein the particle size of the nano-silica is 50 nanometers, the rotating speed of the mixer is 500r/min, the temperature is set to 80 ℃, and the reaction time is 20 minutes, so that the modified nano-silica can be obtained, and the grafting ratio of the modified nano-material is 1.5%.
The implementation process comprises the following steps: drying PBAT (TH801T), PLA (REVODE190) and the modified nano hydrotalcite at 75 ℃ for 11 hours to remove water. Then, uniformly mixing 70 parts of dried PBAT (TH801T), 20 parts of PLA (REVODE190), 10 parts of modified silica, 0.3 part of SAG-008, 0.1 part of KH-570, 0.2 part of composite antioxidant (1010:168 is 1:1) and 1 part of lubricant (polyethylene wax), adding the mixture into a double-screw feeding hopper, setting the screw rotation speed during extrusion granulation to be 450r/min, and setting the screw length-diameter ratio of an extruder to be 48: 1, setting the temperature from each machine barrel to the machine head to 120 ℃, 130 ℃, 140 ℃, 150 ℃ and 140 ℃, cooling by a water tank, and bracing and dicing to obtain the high-strength fully-degradable PBAT/PLA alloy material.
Drying the prepared PBAT/PLA alloy material for 2 hours at 70 ℃, then preparing a sample strip on an injection molding machine, setting the injection molding temperature to be 300 ℃, and characterizing the related performance of the sample strip.
TABLE 1 tensile Properties of PBAT/PLA alloy materials of examples and comparative examples
Claims (9)
1. A high-strength PBAT-PLA alloy material which can be used for external packaging is characterized in that: the components and the parts by weight of each component are respectively as follows:
2. the high strength PBAT-PLA alloy material of claim 1, wherein: the PBAT is selected from blown film grade, and the density is 1.2-1.24 g/cm 3 The melt index is 4.5-5.5 g/10min (190 ℃/2.16 kg).
3. The high strength PBAT/PLA alloy material of claim 1, wherein: the PLA is selected from blown film grade, and the density is 1.2-1.3 g/cm 3 The melt index is 2-10 g/10min (190 ℃/2.16 kg).
4. The high strength PBAT/PLA alloy material of claim 1, wherein: the modified nano material is one or more of modified nano hydrotalcite, modified nano silicon dioxide or modified nano calcium carbonate; the grafting rate of the modified nano material is 0.8-1.5%.
5. The high strength PBAT-PLA alloy material of claim 1, wherein: the chain extender is one or more of a polyfunctional epoxy oligomer, an epoxy macromolecular chain extender and a styrene-maleic anhydride copolymer.
6. The high strength PBAT-PLA alloy material of claim 1, wherein: the coupling agent is one or more of gamma-aminopropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane or gamma-methacryloxypropyltrimethoxysilane.
7. The high strength PBAT-PLA alloy material of claim 1, wherein: the lubricant is one or a plurality of N, N' -ethylene bis stearamide, calcium stearate, oleamide or polyethylene wax; the antioxidant is one or a plurality of antioxidant 1010, antioxidant 168, antioxidant 1098 or antioxidant 245.
8. A method for preparing the high-strength PBAT-PLA alloy material as defined in claim 1, comprises the following steps: weighing 65-85 parts by weight of dry PBAT, 10-30 parts by weight of dry PLA, 5-15 parts by weight of dry modified nano material, 0.3-0.6 part by weight of chain extender, 0.1-0.2 part by weight of coupling agent, 0.2-0.4 part by weight of antioxidant and 1-2 parts by weight of lubricant, uniformly mixing by a high-speed mixer, pouring into a feeding hopper of a double-screw extruder, and carrying out double-screw melt extrusion, cooling and granulation to obtain the high-strength PBAT-PLA alloy material for external packaging.
9. The method of claim 8, wherein: the modification method of the modified nano material comprises the following steps: the mass ratio of the coupling agent to the nano material is 1-2%, the modification equipment is selected to be a high-speed mixer, the rotating speed is 400-500 r/min, the temperature is set to be 70-80 ℃, the reaction time is 20-30 minutes, the required modified nano material is obtained, and the grafting rate of the modified nano material is 0.8-1.5%.
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| KR102233979B1 (en) * | 2020-05-21 | 2021-04-01 | 주식회사 코리아에어캡 | Biodegradable air cap and preparation thereof |
| CN113652063A (en) * | 2021-08-02 | 2021-11-16 | 安徽瑞鸿新材料科技有限公司 | Calcium carbonate filled PBAT/PLA degradable film and preparation method thereof |
| CN113717508A (en) * | 2021-10-14 | 2021-11-30 | 新乐华宝卫材科技有限公司 | Degradable film for sanitary material packaging and preparation method thereof |
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| KR102233979B1 (en) * | 2020-05-21 | 2021-04-01 | 주식회사 코리아에어캡 | Biodegradable air cap and preparation thereof |
| CN113652063A (en) * | 2021-08-02 | 2021-11-16 | 安徽瑞鸿新材料科技有限公司 | Calcium carbonate filled PBAT/PLA degradable film and preparation method thereof |
| CN113717508A (en) * | 2021-10-14 | 2021-11-30 | 新乐华宝卫材科技有限公司 | Degradable film for sanitary material packaging and preparation method thereof |
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