CN114316544B - Heat aging-resistant polylactic acid composite material and preparation method thereof - Google Patents
Heat aging-resistant polylactic acid composite material and preparation method thereof Download PDFInfo
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- CN114316544B CN114316544B CN202210008598.3A CN202210008598A CN114316544B CN 114316544 B CN114316544 B CN 114316544B CN 202210008598 A CN202210008598 A CN 202210008598A CN 114316544 B CN114316544 B CN 114316544B
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- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 112
- 239000004626 polylactic acid Substances 0.000 title claims abstract description 112
- 230000032683 aging Effects 0.000 title claims abstract description 24
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 47
- 229920005989 resin Polymers 0.000 claims abstract description 47
- 150000003505 terpenes Chemical class 0.000 claims abstract description 43
- 235000007586 terpenes Nutrition 0.000 claims abstract description 43
- -1 polyethylene Polymers 0.000 claims abstract description 32
- 239000004698 Polyethylene Substances 0.000 claims abstract description 31
- 229920000359 diblock copolymer Polymers 0.000 claims abstract description 31
- 229920000573 polyethylene Polymers 0.000 claims abstract description 31
- YSAVZVORKRDODB-WDSKDSINSA-N diethyl tartrate Chemical compound CCOC(=O)[C@@H](O)[C@H](O)C(=O)OCC YSAVZVORKRDODB-WDSKDSINSA-N 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000000314 lubricant Substances 0.000 claims abstract description 11
- 239000004014 plasticizer Substances 0.000 claims abstract description 11
- 239000002202 Polyethylene glycol Substances 0.000 claims description 22
- 229920001223 polyethylene glycol Polymers 0.000 claims description 22
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 9
- JQYSLXZRCMVWSR-UHFFFAOYSA-N 1,6-dioxacyclododecane-7,12-dione;terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1.O=C1CCCCC(=O)OCCCCO1 JQYSLXZRCMVWSR-UHFFFAOYSA-N 0.000 claims description 6
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims description 6
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- ZFOZVQLOBQUTQQ-UHFFFAOYSA-N Tributyl citrate Chemical compound CCCCOC(=O)CC(O)(C(=O)OCCCC)CC(=O)OCCCC ZFOZVQLOBQUTQQ-UHFFFAOYSA-N 0.000 claims description 4
- 125000004177 diethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims description 3
- 230000000379 polymerizing effect Effects 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 2
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 239000003960 organic solvent Substances 0.000 claims description 2
- 239000012188 paraffin wax Substances 0.000 claims description 2
- 239000012974 tin catalyst Substances 0.000 claims description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- UZBRNILSUGWULW-UHFFFAOYSA-N 3,8-dioxabicyclo[8.2.2]tetradeca-1(12),10,13-triene-2,9-dione;hexanedioic acid Chemical compound OC(=O)CCCCC(O)=O.O=C1OCCCCOC(=O)C2=CC=C1C=C2 UZBRNILSUGWULW-UHFFFAOYSA-N 0.000 abstract description 2
- 239000012785 packaging film Substances 0.000 abstract description 2
- 229920006280 packaging film Polymers 0.000 abstract description 2
- 229920000704 biodegradable plastic Polymers 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920001707 polybutylene terephthalate Polymers 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 description 2
- 244000198134 Agave sisalana Species 0.000 description 1
- YSAVZVORKRDODB-UHFFFAOYSA-N Diethyl tartrate Chemical compound CCOC(=O)C(O)C(O)C(=O)OCC YSAVZVORKRDODB-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229920000168 Microcrystalline cellulose Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
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- 229940016286 microcrystalline cellulose Drugs 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004629 polybutylene adipate terephthalate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000379 polypropylene carbonate Polymers 0.000 description 1
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- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Biological Depolymerization Polymers (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a polylactic acid composite material with heat aging resistance and a preparation method thereof, which relate to the technical field of biodegradable plastics and are prepared from the following components in percentage by weight: 20-80% of polylactic acid, 10-50% of poly (adipic acid-butylene terephthalate), 5-20% of diethyl tartrate modified terpene resin grafting modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer, 0.2-5% of plasticizer and 0.2-5% of lubricant. The polylactic acid material can be used in the food fields such as cutlery boxes, water cups and the like, has certain light aging resistance, can be applied to the fields such as mulching films, food packaging films and the like, and expands the application field of polylactic acid materials.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a heat aging-resistant polylactic acid composite material.
Background
The traditional plastic packaging material, the plastic cup and the cutlery box are usually made of polypropylene and polycarbonate, but the plastic cup and the cutlery box have the problem of difficult recovery and treatment after use, so that serious environmental pollution is caused, and the environment-friendly polymer material receives wide attention along with the enhancement of environmental awareness of people. Polylactic acid is taken as a renewable resource, has good biodegradability, and also has good mechanical strength and processability, so that the polylactic acid has wide application prospect in the field of plastic application.
However, polylactic acid has a low glass transition temperature and poor long-term heat resistance, and cannot meet the long-term use requirement in a hotter environment, so that the application range of the polylactic acid is greatly limited to a certain extent. The preparation method of the heat-resistant durable polylactic acid composite material of Chinese patent CN201610711838.0 and the heat-resistant durable polylactic acid composite material, disclosed is that the performance of polylactic acid is improved by adding modified sisal fiber and shell micro powder, but the heat-resistant aging characteristic of the polylactic acid is not obviously improved; chinese patent CN201510253197.4 relates to a PLA resin toughening modified material and a preparation method thereof, and discloses a method for improving the heat aging resistance of polylactic acid resin by adding a heat aging resistant agent, but the addition of a large amount of auxiliary agents has an influence on the degradability of the polylactic acid resin; chinese patent CN201610767037.6 discloses a PLA resin modified material and a preparation method thereof, and discloses a method for solving the problems of poor heat resistance and brittleness of polylactic acid by adding microcrystalline cellulose and a heat-resistant aging agent, but the improvement of the heat-resistant aging performance of the polylactic acid is not obvious.
Through the above Chinese patent publication, most of the methods for improving the heat aging resistance of the polylactic acid are realized by adding the heat aging resistance agent conventionally, so that the degradation characteristic of the polylactic acid is reduced, and the heat aging resistance is not obviously improved.
Disclosure of Invention
The invention aims at solving the problems in the prior art and provides a polylactic acid composite material with heat aging resistance and a preparation method thereof.
In order to achieve the aim of the invention, the invention is realized by the following technical scheme:
the heat aging resistant polylactic acid composite material is prepared from the following components in percentage by weight: 20-80% of polylactic acid, 10-50% of poly (butylene terephthalate), 5-20% of diethyl tartrate modified terpene resin graft modified monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer, 0.2-5% of plasticizer and 0.2-5% of lubricant.
Further, the preparation method of the monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer is that, in combination with the previous literature report, the polylactic acid and the monomethoxy polyethylene glycol are prepared into the monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer so as to improve the compatibility of the polylactic acid, and specifically comprises the following steps: taking polylactic acid and polyethylene glycol monomethyl ether as raw materials, dissolving the polyethylene glycol monomethyl ether in ethanol, removing water and filtering for later use; drying polylactic acid for standby; weighing polylactic acid and polyethylene glycol monomethyl ether, wherein the polylactic acid and polyethylene glycol monomethyl ether comprise the following components in percentage by weight: 10% -90% of polylactic acid and 10% -90% of polyethylene glycol monomethyl ether, respectively dissolving the polylactic acid and the polyethylene glycol monomethyl ether into a polylactic acid solution with the mass fraction of 10% -20% and a polyethylene glycol monomethyl ether solution with the mass fraction of 10% -20% by using volatile organic solvents, then adding a tin catalyst with the mass fraction of 1% -2% into the polylactic acid solution, uniformly adding the polyethylene glycol monomethyl ether solution while stirring, and polymerizing for 10-30min under the vacuum condition of 10-50Pa to obtain the methoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer.
Further, the preparation method of the diethyl tartrate modified terpene resin comprises the following steps: heating terpene resin to a molten state, preserving heat for 20-40min, adding polyvinyl alcohol accounting for 2% -10% of the mass of the terpene resin into the molten terpene resin, stirring at a high speed of 1000-2000r/min for 1-2h, adding diethyl tartrate accounting for 2% -10% of the mass of the terpene resin, continuously stirring for 1-2h, and cooling to room temperature to obtain diethyl tartrate modified terpene resin.
Further, the preparation method of the diethyl tartrate-modified terpene resin grafting modified monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer comprises the following steps: diethyl tartrate modified terpene resin, monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer, glycidyl methacrylate and tetrabutyl titanate are melt blended, and the weight percentages of the components are as follows: 20-60% of diethyl tartrate modified terpene resin, 20-60% of monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer, 10-20% of glycidyl methacrylate and 10-20% of tetrabutyl titanate, wherein the melting and mixing temperature is 160-200 ℃, the rotating speed is 500-1000r/min, and the chemical grafting modified diethyl tartrate modified terpene resin grafting modified monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer is obtained after mixing for 10-30 min.
Further, the weight average molecular weight of the polylactic acid is 100000-200000.
Further, the plasticizer is one or the combination of two of tributyl citrate and polyethylene glycol.
Further, the lubricant is one or a combination of more of zinc stearate, erucamide and paraffin.
The preparation method of the heat aging resistant polylactic acid composite material comprises the following steps: uniformly mixing polylactic acid, poly (butylene adipate-terephthalate) and diethyl tartrate modified terpene resin grafted modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer, plasticizer and lubricant to obtain a mixed material; and then the mixed material is melted and extruded by a double screw extruder, the extrusion temperature is 170-200 ℃, and the heat aging resistant polylactic acid composite material can be obtained by cooling and granulating.
Further, the polylactic acid, the poly (butylene adipate-terephthalate) and the diethyl tartrate modified terpene resin are subjected to branch grafting modification of the monomethoxy polyethylene glycol-polylactic acid diblock copolymer to be dried before mixing, wherein the drying temperature is 60-100 ℃ and the drying time is 4-6 hours.
The polylactic acid composite material can be used in the food fields of cutlery boxes, water cups and the like, has certain light aging resistance, can be applied to the fields of mulching films, food packaging films and the like, and expands the application field of polylactic acid materials.
According to the heat-aging-resistant polylactic acid composite material provided by the invention, the toughness of the polylactic acid composite material is improved by adding the adipic acid-butylene terephthalate, the compatibility of polylactic acid is improved by preparing the monomethoxy polyethylene glycol-polylactic acid diblock copolymer, the heat-aging-resistant performance of the terpene resin is further improved by modifying the terpene resin with diethyl tartrate, and the monomethoxy polyethylene glycol-polylactic acid diblock copolymer is chemically grafted and modified by using the terpene resin modified with diethyl tartrate, so that the heat-aging-resistant characteristic of the polylactic acid composite material is improved.
Detailed Description
The raw material information used in the examples and comparative examples is as follows:
| raw materials | Manufacturer' s |
| Polylactic acid L130 | Daerke bi en gong si |
| Polybutylene adipate-terephthalate 801T | Blue mountain Tun river Co Ltd |
| Polyethylene glycol monomethyl ether | Ara Ding Shiji |
| Tartaric acid diethyl ester | Hubei Xingzheng science and technology Co Ltd |
| Terpene resin | Hengfeng petrochemical plant |
| Glycidyl methacrylate | Ara Ding Shiji |
| Tetrabutyl titanate | Ara Ding Shiji |
| Stannous octoate | Ara Ding Shiji |
| Ethanol | Products of general commercial market |
The invention is further illustrated in the following embodiments in which the tensile strength in examples and comparative examples is measured according to standard ISO 527, the spline dimensions being 170mm by 10mm by 4mm, the tensile rate being 50mm/min;
examples of preparation of diethyl tartrate-modified terpene resin graft-modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer:
first, a monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer was prepared: weighing polylactic acid with the mass fraction of 80% and polyethylene glycol monomethyl ether with the mass fraction of 20%, respectively dissolving the polylactic acid and the polyethylene glycol monomethyl ether into polylactic acid with the mass fraction of 10% and polyethylene glycol monomethyl ether solution with the mass fraction of 10% by using acetone and ethanol, then adding stannous octoate catalyst with the mass fraction of 1% into the polylactic acid solution, uniformly adding the polyethylene glycol monomethyl ether solution while stirring, and polymerizing for 30min under the vacuum condition of 10Pa to obtain the methoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer.
Secondly, preparing diethyl tartrate modified terpene resin: heating terpene resin with the mass fraction of 80% to a molten state, preserving heat for 30min, adding 10% of polyvinyl alcohol into the molten terpene resin, stirring at a high speed of 2000r/min for 2h, adding diethyl tartrate with the mass fraction of 10% of the terpene resin, continuing stirring for 2h, and cooling to room temperature to obtain diethyl tartrate modified terpene resin.
Finally, preparing diethyl tartrate modified terpene resin grafting modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer: the mass fraction is as follows: 40% of diethyl tartrate modified terpene resin, 40% of monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer, 10% of glycidyl methacrylate and 10% of tetrabutyl titanate, and carrying out melt blending, wherein the melt mixing temperature is 180 ℃, the rotating speed is 500r/min, and the chemical grafting modified diethyl tartrate modified terpene resin grafting modified monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer is obtained after mixing for 10 min.
Example 1:
the components are as follows: 56% of polylactic acid, 20% of poly (butylene terephthalate), 20% of diethyl tartrate modified terpene resin graft modified monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer, 2% of plasticizer and 2% of lubricant, drying the materials at 80 ℃ for 4 hours, uniformly mixing, melting, extruding and granulating at 180 ℃ by a double screw extruder, and drying at 80 ℃ for 4 hours to obtain the polylactic acid composite material.
Example 2:
the components are as follows: 66% of polylactic acid, 20% of poly (butylene terephthalate), 10% of diethyl tartrate modified terpene resin graft modified monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer, 2% of plasticizer and 2% of lubricant, drying the materials at 80 ℃ for 4 hours, uniformly mixing, melting, extruding and granulating at 180 ℃ by a double screw extruder, and drying at 80 ℃ for 4 hours to obtain the polylactic acid composite material.
Example 3:
the components are as follows: 71% of polylactic acid, 20% of poly (butylene terephthalate), 5% of diethyl tartrate modified terpene resin graft modified monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer, 2% of plasticizer and 2% of lubricant, drying the materials at 80 ℃ for 4 hours, uniformly mixing, melting and extruding the materials at 180 ℃ by a double screw extruder, granulating, and drying at 80 ℃ for 4 hours to obtain the polylactic acid composite material.
Comparative example:
the components are as follows: 76% of polylactic acid, 20% of poly (butylene adipate-terephthalate), 2% of plasticizer and 2% of lubricant, drying the materials at 80 ℃ for 4 hours, uniformly mixing, melting, extruding and granulating at 180 ℃ by a double-screw extruder, and drying at 80 ℃ for 4 hours to obtain the polylactic acid composite material.
The polylactic acid composite materials prepared in the above examples 1 and 2 and comparative example 1 were molded by an injection molding machine to obtain test bars, which were subjected to performance test after being stabilized at 85 ℃ for 1000 hours, and the test results are shown in table 1.
Table 1:
| example 1 | Example 2 | Example 3 | Comparative example 1 | |
| Tensile strength MPa | 35.8 | 32.4 | 31.2 | 29.8 |
| Tensile strength MPa after 1000h heat aging | 31.3 | 22.8 | 21.0 | 15.9 |
| Tensile strength retention after 1000h heat aging% | 87.4 | 70.3 | 65.4 | 53.5 |
As can be seen from Table 1, the tensile strength retention rate of the polylactic acid composite material prepared by the method is obviously improved after aging for 1000 hours at 85 ℃, and the polylactic acid composite material has higher tensile strength.
It should be noted that although embodiments of the present invention have been shown and described herein, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims (8)
1. A heat aging resistant polylactic acid material is characterized in that: the preparation method comprises the following components in percentage by weight: 20-80% of polylactic acid, 10-50% of poly (butylene adipate-terephthalate), 5-20% of diethyl tartrate-modified terpene resin graft modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer, 0.2-5% of plasticizer and 0.2-5% of lubricant, and the preparation method of the diethyl tartrate-modified terpene resin graft modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer comprises the following steps: diethyl tartrate modified terpene resin, monomethoxy polyethylene glycol-polylactic acid diblock copolymer, glycidyl methacrylate and tetrabutyl titanate are melt blended, and the weight percentages of the components are as follows: 20% -60% of diethyl tartrate modified terpene resin, 20% -60% of monomethoxy polyethylene glycol-polylactic acid diblock copolymer, 10% -20% of glycidyl methacrylate and 10% -20% of tetrabutyl titanate, wherein the melt blending temperature is 160 ℃ -200 ℃, the rotating speed is 500-1000r/min, and the chemical grafting modified diethyl tartrate modified terpene resin grafting modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer is obtained after mixing for 10-30 min.
2. The polylactic acid material according to claim 1, wherein: the weight average molecular weight of the polylactic acid is 100000-200000.
3. The polylactic acid material according to claim 1, wherein: the plasticizer is one or two of tributyl citrate and polyethylene glycol.
4. The polylactic acid material according to any one of claims 1 to 3, wherein: the lubricant is one or more of zinc stearate, erucamide and paraffin.
5. The polylactic acid material according to claim 1, wherein: the preparation method of the monomethoxy polyethylene glycol-polylactic acid diblock copolymer comprises the steps of weighing polylactic acid and polyethylene glycol monomethyl ether, wherein the polylactic acid and the polyethylene glycol monomethyl ether comprise the following components in percentage by weight: 10% -90% of polylactic acid and 10% -90% of polyethylene glycol monomethyl ether, respectively dissolving the polylactic acid and the polyethylene glycol monomethyl ether into a polylactic acid solution with the mass fraction of 10% -20% and a polyethylene glycol monomethyl ether solution with the mass fraction of 10% -20% by using volatile organic solvents, then adding a tin catalyst with the mass fraction of 1% -2% into the polylactic acid solution, uniformly adding the polyethylene glycol monomethyl ether solution while stirring, and polymerizing for 10-30min under the vacuum condition of 10-50Pa to obtain the methoxy polyethylene glycol-polylactic acid diblock copolymer.
6. The polylactic acid material according to claim 5, wherein: the preparation method of the diethyl tartrate modified terpene resin comprises the following steps: heating terpene resin to a molten state, preserving heat for 20-40min, adding polyvinyl alcohol accounting for 2% -10% of the mass of the terpene resin into the molten terpene resin, stirring at a high speed of 1000-2000r/min for 1-2h, adding diethyl tartrate accounting for 2% -10% of the mass of the terpene resin, continuously stirring for 1-2h, and cooling to room temperature to obtain diethyl tartrate modified terpene resin.
7. The method for producing a heat aging resistant polylactic acid material according to any one of claims 1 to 6, characterized in that: uniformly mixing polylactic acid, poly (butylene adipate-terephthalate) and diethyl tartrate modified terpene resin grafted modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer, plasticizer and lubricant to obtain a mixed material; and then the mixed material is melted and extruded by a double screw extruder, the extrusion temperature is 170-200 ℃, and the heat aging resistant polylactic acid composite material can be obtained by cooling and granulating.
8. The method according to claim 7, wherein: respectively drying polylactic acid, poly (butylene adipate-terephthalate) and diethyl tartrate modified terpene resin grafted modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer at 60-100 ℃ for 4-6 hours before mixing.
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| US4994508A (en) * | 1987-07-16 | 1991-02-19 | Asahi Kasei Kogyo Kabushiki Kaisha | Specific hydrogenated block copolymer composition and process for producing the same |
| JP2004250698A (en) * | 2003-01-30 | 2004-09-09 | Dainippon Ink & Chem Inc | Polylactic acid composition |
| CN111303392A (en) * | 2020-04-03 | 2020-06-19 | 浙江工业大学 | Preparation method of amphiphilic block copolymer based on polyethylene glycol terminal group modification |
| CN111777750A (en) * | 2020-07-07 | 2020-10-16 | 江西师范大学 | Preparation method of polyethylene glycol-polylactic acid block copolymer and method for regulating and controlling crystallization behavior of polylactic acid |
| CN112094488A (en) * | 2020-09-25 | 2020-12-18 | 长春工业大学 | High-toughness high-heat-resistance polylactic acid composite material and preparation method thereof |
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