CN116855046A - PLA/PPC-based biodegradable material and preparation method thereof - Google Patents
PLA/PPC-based biodegradable material and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229920000379 polypropylene carbonate Polymers 0.000 claims abstract description 73
- 239000004626 polylactic acid Substances 0.000 claims abstract description 61
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 59
- 239000000203 mixture Substances 0.000 claims abstract description 53
- -1 polypropylene carbonate Polymers 0.000 claims abstract description 31
- 235000012424 soybean oil Nutrition 0.000 claims abstract description 9
- 239000003549 soybean oil Substances 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims description 21
- 239000003963 antioxidant agent Substances 0.000 claims description 20
- 230000003078 antioxidant effect Effects 0.000 claims description 20
- 239000003999 initiator Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 239000002981 blocking agent Substances 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 4
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 3
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 claims description 2
- OFHGRWFJFOTSBD-UHFFFAOYSA-N C(C1=CC=CC=C1)(=O)NNC(C1=CC=CC=C1)=O.C(CCCCC(=O)O)(=O)O Chemical compound C(C1=CC=CC=C1)(=O)NNC(C1=CC=CC=C1)=O.C(CCCCC(=O)O)(=O)O OFHGRWFJFOTSBD-UHFFFAOYSA-N 0.000 claims description 2
- YIVJZNGAASQVEM-UHFFFAOYSA-N Lauroyl peroxide Chemical compound CCCCCCCCCCCC(=O)OOC(=O)CCCCCCCCCCC YIVJZNGAASQVEM-UHFFFAOYSA-N 0.000 claims description 2
- UWJRJUDLJQOQSP-UHFFFAOYSA-N N=C=O.N=C=O.CC1=CC=CC(C)=C1C Chemical compound N=C=O.N=C=O.CC1=CC=CC(C)=C1C UWJRJUDLJQOQSP-UHFFFAOYSA-N 0.000 claims description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 2
- 235000010354 butylated hydroxytoluene Nutrition 0.000 claims description 2
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 2
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 claims 1
- 239000004593 Epoxy Substances 0.000 abstract description 5
- 208000034530 PLAA-associated neurodevelopmental disease Diseases 0.000 abstract description 5
- 125000000524 functional group Chemical group 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 abstract description 4
- 239000012752 auxiliary agent Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000009257 reactivity Effects 0.000 abstract description 3
- 238000007142 ring opening reaction Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 31
- 230000000052 comparative effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 238000000520 microinjection Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 238000001746 injection moulding Methods 0.000 description 3
- 229920001896 polybutyrate Polymers 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 238000002411 thermogravimetry Methods 0.000 description 2
- 239000004368 Modified starch Substances 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 229920006125 amorphous polymer Polymers 0.000 description 1
- 239000003519 biomedical and dental material Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 229920006237 degradable polymer Polymers 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil 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
- 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
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
-
- 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
- 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
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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 biodegradable material based on PLA/PPC and a preparation method thereof, and relates to a biodegradable material and a preparation method thereof, wherein the epoxidized soybean oil micromolecular auxiliary agent is used for improving the compatibility of the material, and the high reactivity after the ring opening of an epoxy functional group is utilized for further improving the toughness and the thermal stability of the material and well maintaining the rigidity, the processing fluidity and the optical performance of the material; the dried polylactic acid (PLA), the polypropylene carbonate (PPC) and the Epoxidized Soybean Oil (ESO) are subjected to a melting reaction by a double-screw extruder, so that a strong intermolecular force is formed between the PLA and the PPC, the compatibility between the PLA and the PPC is fully improved, and the obtained blend has excellent impact strength, elongation at break and thermal stability compared with a pure PLA/PPC system; meanwhile, the process has strong operability, is easy for industrialized mass production, and has good economic benefit and wide application prospect.
Description
Technical Field
The invention relates to a degradable material and a preparation method thereof, in particular to a PLA/PPC-based biodegradable material and a preparation method thereof.
Background
Polylactic acid (PLA) is a completely degradable polymer which is friendly to the environment, has good processing performance, is nontoxic and harmless to human bodies, can be used as a biomedical material, and has wide application prospect. However, PLA has disadvantages of high rigidity, poor toughness, etc., which limit its further popularization and use.
The polypropylene carbonate (PPC) is amorphous polymer with flexible molecular chains in an amorphous state, is a biodegradable material, and is degraded into carbon dioxide and water, so that the degradation products can not harm organs in the body after entering the human body. Therefore, the comprehensive performance of the polylactic acid can be improved by adopting a polymer blending means with good flexibility and strong crystallization capability.
The invention patent application of the published patent number CN 101724250A discloses a preparation method of a blend of PPC, PBAT, PLA and PBS, wherein the performance of the PPC is improved by adding the PBAT, PLA and PBS, the blend takes PPC as a main matrix, the addition amount of the PBAT, PLA and PBS is 5-50%, but a compatibilizer is not used in the preparation process, and phase separation is easy to occur between the blend.
The invention patent application of the published patent number CN 103254596A discloses a PLA/PPC biodegradable composite material and a preparation method thereof, wherein the PLA/PPC biodegradable composite material is obtained by mixing polylactic acid, carbon dioxide and propylene oxide copolymer, modified starch, ethylene-vinyl acetate copolymer, polylactic acid graft copolymer and vegetable oil polyol, and then adding the mixture into a double-screw extruder for melt blending. The mechanical property of the obtained composite material is effectively improved. However, the method has the disadvantages of excessive raw materials, complex operation process, extremely severe requirements on the preparation process and difficult industrialized popularization.
Disclosure of Invention
The invention aims to provide a PLA/PPC-based biodegradable material and a preparation method thereof, wherein the epoxidized soybean oil micromolecular auxiliary agent is used for improving the compatibility of the material, the toughness and the thermal stability of the material are further improved by utilizing the high reactivity of the epoxy functional group after ring opening, the rigidity, the processing fluidity and the optical performance of the material are well maintained, the required raw materials are easy to obtain, the production cost is low, and the operation steps are simple.
The invention aims at realizing the following technical scheme:
a PLA/PPC-based biodegradable material, the material consisting of:
60-90 parts of polylactic acid;
0-50 parts of polypropylene carbonate;
1-6 parts of end capping agent;
1-10 parts of compatibilizer;
0.1-0.5 part of initiator;
0.1-0.5 part of antioxidant.
The end capping agent is one or more of glycidyl methacrylate, maleic anhydride and dibenzoyl peroxide.
The compatibilizer is one or more of epoxidized soybean oil, 4-xylyl methane diisocyanate and adipic acid dibenzoyl hydrazine based on PLA/PPC biodegradable materials;
the initiator is one or more of dibenzoyl peroxide, lauroyl peroxide and dicumyl peroxide;
the antioxidant is one or more of pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], n-stearyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate and 2, 6-di-tert-butyl-4-methylphenol.
A preparation method of a biodegradable material based on PLA/PPC, which comprises the following preparation processes:
(1) Uniformly mixing the dried polypropylene carbonate and a blocking agent, adding the mixture into a double-screw extruder for blocking treatment, setting the heating temperature of the double-screw extruder to be 150-190 ℃ and the rotating speed to be 20-80 r/min, taking materials, drying and reserving for use;
(2) Uniformly mixing the end-capped polypropylene carbonate obtained in the step (1), the dried polylactic acid, the compatibilizer, the initiator and the antioxidant, and adding the mixture into a double-screw extruder, wherein the heating temperature of the double-screw extruder is set to be 150-190 ℃ and the rotating speed of the double-screw extruder is set to be 20-80 revolutions per minute.
The invention has the advantages and effects that:
1. the raw materials used in the invention are all biodegradable materials, so that the problem of white pollution is relieved. The invention has low cost and simple process, and widens the application range of the polylactic acid composite material in industry.
2. The epoxidized soybean oil is introduced, and the high reactivity of the epoxy functional group after ring opening is utilized, so that the toughness and the thermal stability of the material are improved, the rigidity, the processing fluidity and the optical performance of the blend are well maintained, and the epoxy modified soybean oil blend has wide application prospect.
3. According to the invention, the epoxidized soybean oil with epoxy functional groups is used for improving the compatibility and mechanical properties of the PLA/PPC blend, and the maleic anhydride and dicumyl peroxide are added as the auxiliary agents to promote the reaction to be fully carried out, so that the toughness of the material is improved, the operation flow is simplified, and the cost is reduced.
Description of the embodiments
The present invention will be described in detail with reference to specific embodiments, but the present invention is not limited to these specific embodiments, and those skilled in the art can make some insubstantial improvements and modifications of the present invention based on the contents of the above-described invention.
Comparative example 1
70 parts of polylactic acid
30 parts of polypropylene carbonate
1 part of end capping agent
Initiator 0.15 part
0.15 part of antioxidant
(1) Uniformly mixing the dried polypropylene carbonate and a blocking agent, adding the mixture into a double-screw extruder for blocking treatment, setting the heating temperature of the double-screw extruder to 170 ℃, setting the rotating speed to 60 revolutions per minute, taking materials, and drying for later use;
(2) Uniformly mixing the capped polypropylene carbonate obtained in the step (1), the dried polylactic acid, an initiator and an antioxidant, and adding the mixture into a double-screw extruder, wherein the heating temperature of the double-screw extruder is set to be 150-190 ℃, and the rotating speed of the double-screw extruder is 20-80 r/min, so as to obtain the PLA/PPC blend.
(3) And adding the final PLA/PPC blend sample into a micro injection molding machine, setting the temperature of a charging barrel to 170 ℃, setting the temperature of a mold to 50 ℃, maintaining the pressure for 10s, and performing injection molding on the sample according to the national standard GB/T1040.2-2006 to form a tensile spline. And (3) adding the dried sample into a micro injection molding machine, setting the temperature of a charging barrel to 170 ℃, setting the temperature of a mold to 50 ℃, and maintaining the pressure for 10s, and performing injection molding on the sample according to the national standard GB/T1843-2008 to obtain an impact spline. The inventors tested the elongation at break and impact strength of the materials according to GB/T1040.2-2006 and GB/T1043.1-2008 test standards, respectively. Samples of PLA/PPC blend (6-8 mg) were placed in a crucible for DSC thermal performance testing. The resulting PLA/PPC blend sample (about 15 mg) was heated from room temperature to 500℃under flowing nitrogen (100 mL/min) for thermogravimetric analysis. Samples of the PLA/PPC blend were pressed into films about 80 μm thick using a flat vulcanizing machine and the haze and transmittance of the material were measured using a haze meter (CS-700). The flow properties of the blends were determined according to test standard ASTM D1238-2013 using a melt flow Rate apparatus (GT-7100-MH) at 190℃under a load of 2.16 kg.
Example 1
70 parts of polylactic acid
30 parts of polypropylene carbonate
Compatibilizer 1 part
1 part of end capping agent
Initiator 0.15 part
0.15 part of antioxidant
(1) Uniformly mixing the dried polypropylene carbonate and a blocking agent, adding the mixture into a double-screw extruder for blocking treatment, setting the heating temperature of the double-screw extruder to 170 ℃, setting the rotating speed to 60 revolutions per minute, taking materials, and drying for later use;
(2) Uniformly mixing the capped polypropylene carbonate obtained in the step (1), dried polylactic acid, a compatibilizer, an initiator and an antioxidant, and adding the mixture into a double-screw extruder, wherein the heating temperature of the double-screw extruder is set to be 150-190 ℃ and the rotating speed of the double-screw extruder is set to be 20-80 revolutions per minute, so as to obtain a PLA/PPC/ESO blend sample.
Example 2
70 parts of polylactic acid
30 parts of polypropylene carbonate
2 parts of compatibilizer
1 part of end capping agent
Initiator 0.15 part
0.15 part of antioxidant
(1) Uniformly mixing the dried polypropylene carbonate and a blocking agent, adding the mixture into a double-screw extruder for blocking treatment, setting the heating temperature of the double-screw extruder to 170 ℃, setting the rotating speed to 60 revolutions per minute, taking materials, and drying for later use;
(2) Uniformly mixing the capped polypropylene carbonate obtained in the step (1), dried polylactic acid, a compatibilizer, an initiator and an antioxidant, and adding the mixture into a double-screw extruder, wherein the heating temperature of the double-screw extruder is set to be 150-190 ℃ and the rotating speed of the double-screw extruder is set to be 20-80 revolutions per minute, so as to obtain a PLA/PPC/ESO blend sample.
Example 3
70 parts of polylactic acid
30 parts of polypropylene carbonate
3 parts of compatibilizer
1 part of end capping agent
Initiator 0.15 part
0.15 part of antioxidant
(1) Uniformly mixing the dried polypropylene carbonate and a blocking agent, adding the mixture into a double-screw extruder for blocking treatment, setting the heating temperature of the double-screw extruder to 170 ℃, setting the rotating speed to 60 revolutions per minute, taking materials, and drying for later use;
(2) Uniformly mixing the capped polypropylene carbonate obtained in the step (1), dried polylactic acid, a compatibilizer, an initiator and an antioxidant, and adding the mixture into a double-screw extruder, wherein the heating temperature of the double-screw extruder is set to be 150-190 ℃ and the rotating speed of the double-screw extruder is set to be 20-80 revolutions per minute, so as to obtain a PLA/PPC/ESO blend sample.
Example 4
70 parts of polylactic acid
30 parts of polypropylene carbonate
4 parts of compatibilizer
1 part of end capping agent
Initiator 0.15 part
0.15 part of antioxidant
(1) Uniformly mixing the dried polypropylene carbonate and a blocking agent, adding the mixture into a double-screw extruder for blocking treatment, setting the heating temperature of the double-screw extruder to 170 ℃, setting the rotating speed to 60 revolutions per minute, taking materials, and drying for later use;
(2) Uniformly mixing the capped polypropylene carbonate obtained in the step (1), dried polylactic acid, a compatibilizer, an initiator and an antioxidant, and adding the mixture into a double-screw extruder, wherein the heating temperature of the double-screw extruder is set to be 150-190 ℃ and the rotating speed of the double-screw extruder is set to be 20-80 revolutions per minute, so as to obtain a PLA/PPC/ESO blend sample.
Example 5
70 parts of polylactic acid
30 parts of polypropylene carbonate
5 parts of compatibilizer
1 part of end capping agent
Initiator 0.15 part
0.15 part of antioxidant
(1) Uniformly mixing the dried polypropylene carbonate and a blocking agent, adding the mixture into a double-screw extruder for blocking treatment, setting the heating temperature of the double-screw extruder to 170 ℃, setting the rotating speed to 60 revolutions per minute, taking materials, and drying for later use;
(2) Uniformly mixing the capped polypropylene carbonate obtained in the step (1), dried polylactic acid, a compatibilizer, an initiator and an antioxidant, and adding the mixture into a double-screw extruder, wherein the heating temperature of the double-screw extruder is set to be 150-190 ℃ and the rotating speed of the double-screw extruder is set to be 20-80 revolutions per minute, so as to obtain a PLA/PPC/ESO blend sample.
Example 6
70 parts of polylactic acid
30 parts of polypropylene carbonate
Compatibilizer 6 parts
1 part of end capping agent
Initiator 0.15 part
0.15 part of antioxidant
(1) Uniformly mixing the dried polypropylene carbonate and a blocking agent, adding the mixture into a double-screw extruder for blocking treatment, setting the heating temperature of the double-screw extruder to 170 ℃, setting the rotating speed to 60 revolutions per minute, taking materials, and drying for later use;
(2) Uniformly mixing the capped polypropylene carbonate obtained in the step (1), dried polylactic acid, a compatibilizer, an initiator and an antioxidant, and adding the mixture into a double-screw extruder, wherein the heating temperature of the double-screw extruder is set to be 150-190 ℃ and the rotating speed of the double-screw extruder is set to be 20-80 revolutions per minute, so as to obtain a PLA/PPC/ESO blend sample.
Effect examples 1 to 6
The inventors respectively added PLA/PPC/ESO blend samples prepared in examples 1-6 of the present invention into a micro injection molding machine, set the barrel temperature at 170 ℃, the mold temperature at 50 ℃ and the dwell time at 10s, and injection-molded the samples into tensile bars according to national standard GB/T1040.2-2006. And (3) adding the dried sample into a micro injection molding machine, setting the temperature of a charging barrel to 170 ℃, setting the temperature of a mold to 50 ℃, and maintaining the pressure for 10s, and performing injection molding on the sample according to the national standard GB/T1843-2008 to obtain an impact spline. The inventors tested the impact strength, tensile strength and elongation at break of the material according to GB/T1043.1-2008 and GB/T1040.2-2006 test standards, respectively.
From the table data, it can be found that the impact strength, tensile strength and elongation at break in the specific examples are all improved compared with those in the comparative examples, and the introduction of the epoxidized soybean oil well combines the toughness and rigidity of the blend.
Effect examples 7 to 12
The inventors placed samples (6-8 mg) of PLA/PPC/ESO blends prepared in examples 1-6 of the invention into a crucible, respectively, for DSC thermal performance testing.
| T g1 (℃) | T g2 (℃) | ΔT g (℃) | |
| Comparative example 1 | 56.42 | 34.37 | 22.05 |
| Effect example 7 | 56.36 | 34.71 | 21.65 |
| Effect example 8 | 55.03 | 34.93 | 20.10 |
| Effect example 9 | 55.63 | 35.64 | 19.99 |
| Effect example 10 | 53.95 | 34.90 | 19.05 |
| Effect example 11 | 53.89 | 36.00 | 17.89 |
| Effect example 12 | 54.06 | 34.58 | 19.48 |
From the data in the table, it can be seen that the PLA phase glass transition temperature (T) after the ESO was introduced g1 ) Glass transition temperature (T) with PPC phase g2 ) Difference (DeltaT) g ) Smaller, indicating that the introduction of ESO can increase the compatibility of PLA with PPC.
Effect examples 13 to 18
The inventors performed thermogravimetric analyses on samples of PLA/PPC/ESO blends prepared in examples 1-6 of the present invention, respectively.
| T 5% (℃) | T max (℃) | |
| Comparative example 1 | 319.32 | 474.57 |
| Effect example 13 | 324.41 | 475.46 |
| Effect example 14 | 338.10 | 505.03 |
| Effect example 15 | 348.34 | 499.34 |
| Effect example 16 | 351.67 | 489.59 |
| Effect example 17 | 354.59 | 501.91 |
| Effect example 18 | 362.18 | 498.20 |
From the data in the table, it can be seen that the temperature (T 5% ) And the maximum loss rate temperature (T) max ) The temperature of the blend is improved to a certain extent compared with that of the comparative example, which shows that the introduction of ESO improves the thermal stability of the blend to a certain extent.
Effect examples 19 to 24
The inventors pressed samples of PLA/PPC/ESO blends prepared in examples 1-6 of the invention, respectively, into films about 80 μm thick and tested the haze and transmittance of the blends using a haze meter (CS-700).
| Haze (%) | Transmittance (%) | |
| Comparative example 1 | 42.51 | 92.83 |
| Effect example 19 | 29.61 | 92.42 |
| Effect example 20 | 29.10 | 92.71 |
| Effect example 21 | 28.71 | 92.60 |
| Effect example 22 | 32.55 | 92.55 |
| Effect example 23 | 35.89 | 92.46 |
| Effect example 24 | 37.71 | 92.01 |
From the data in the table, it can be seen that the haze of the PLA/PPC blend can be reduced while maintaining the high transmittance of the blend after the ESO is incorporated therein, and the blend as a whole exhibits superior optical properties.
Effect examples 25 to 30
The inventors placed samples of PLA/PPC/ESO blends prepared in examples 1-6 of the invention into a melt flow Rate apparatus (GT-7100-MH) at 190℃under a load of 2.16 kg to determine the Melt Flow Rate (MFR) of the blend.
| MFR(g/10min) | |
| Comparative example 1 | 2.72 |
| Effect example 25 | 2.65 |
| Effect example 26 | 2.59 |
| Effect example 27 | 2.56 |
| Effect example 28 | 2.43 |
| Effect example 29 | 2.20 |
| Effect example 30 | 2.40 |
From the data in the table, it can be seen that after the introduction of ESO in the PLA/PPC blend, no major fluctuations in the melt flow rate of the blend occurred, indicating that the introduction of ESO did not have a significant effect on the processing flowability of the material.
Claims (6)
1. A PLA/PPC-based biodegradable material, characterized in that the material consists of the following raw materials:
60-90 parts of polylactic acid;
0-50 parts of polypropylene carbonate;
1-6 parts of end capping agent;
1-10 parts of compatibilizer;
0.1-0.5 part of initiator;
0.1-0.5 part of antioxidant.
2. The PLA/PPC-based biodegradable material according to claim 1, wherein said end-capping agent is one or more of glycidyl methacrylate, maleic anhydride, dibenzoyl peroxide.
3. The biodegradable PLA/PPC-based material according to claim 1, wherein said compatibilizer is one or more of epoxidized soybean oil, 4-xylyl methane diisocyanate, adipic acid dibenzoyl hydrazine.
4. The PLA/PPC-based biodegradable material according to claim 1, wherein the initiator is one or more of dibenzoyl peroxide, lauroyl peroxide and dicumyl peroxide.
5. The PLA/PPC-based biodegradable material according to claim 1, wherein the antioxidant is one or more of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], n-stearyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate and 2, 6-di-tert-butyl-4-methylphenol.
6. A preparation method of a biodegradable material based on PLA/PPC, which is characterized by comprising the following preparation processes:
(1) Uniformly mixing the dried polypropylene carbonate and a blocking agent, adding the mixture into a double-screw extruder for blocking treatment, setting the heating temperature of the double-screw extruder to be 150-190 ℃ and the rotating speed to be 20-80 r/min, taking materials, drying and reserving for use;
(2) Uniformly mixing the end-capped polypropylene carbonate obtained in the step (1), the dried polylactic acid, the compatibilizer, the initiator and the antioxidant, and adding the mixture into a double-screw extruder, wherein the heating temperature of the double-screw extruder is set to be 150-190 ℃ and the rotating speed of the double-screw extruder is set to be 20-80 revolutions per minute.
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