CN114316544A - Thermal-aging-resistant polylactic acid composite material and preparation method thereof - Google Patents
Thermal-aging-resistant polylactic acid composite material and preparation method thereof Download PDFInfo
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- CN114316544A CN114316544A CN202210008598.3A CN202210008598A CN114316544A CN 114316544 A CN114316544 A CN 114316544A CN 202210008598 A CN202210008598 A CN 202210008598A CN 114316544 A CN114316544 A CN 114316544A
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- polylactic acid
- polyethylene glycol
- terpene resin
- diblock copolymer
- diethyl tartrate
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- 229920000747 poly(lactic acid) Polymers 0.000 title claims abstract description 107
- 239000004626 polylactic acid Substances 0.000 title claims abstract description 107
- 239000002131 composite material Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000003878 thermal aging Methods 0.000 title claims abstract description 13
- 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
- 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 33
- 229920000359 diblock copolymer Polymers 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 21
- -1 polyethylene Polymers 0.000 claims abstract description 20
- 239000004698 Polyethylene Substances 0.000 claims abstract description 16
- 229920000573 polyethylene Polymers 0.000 claims abstract description 16
- 239000000314 lubricant Substances 0.000 claims abstract description 11
- 239000004014 plasticizer Substances 0.000 claims abstract description 11
- 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 abstract description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims description 21
- 229920001223 polyethylene glycol Polymers 0.000 claims description 21
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 12
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 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
- 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
- 238000000034 method Methods 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
- 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
- 239000000203 mixture 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
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims 4
- 235000014655 lactic acid Nutrition 0.000 claims 2
- 239000004310 lactic acid Substances 0.000 claims 2
- AXKZIDYFAMKWSA-UHFFFAOYSA-N 1,6-dioxacyclododecane-7,12-dione Chemical compound O=C1CCCCC(=O)OCCCCO1 AXKZIDYFAMKWSA-UHFFFAOYSA-N 0.000 claims 1
- 230000032683 aging Effects 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 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
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 239000004629 polybutylene adipate terephthalate Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 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
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 239000000126 substance 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
- 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 description 1
- 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
- 229920000168 Microcrystalline cellulose Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 241000190070 Sarracenia purpurea Species 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
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 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
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 235000019813 microcrystalline cellulose Nutrition 0.000 description 1
- 239000008108 microcrystalline cellulose Substances 0.000 description 1
- 229940016286 microcrystalline cellulose Drugs 0.000 description 1
- 238000011056 performance test Methods 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
- 238000011084 recovery Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention discloses a thermal aging-resistant polylactic acid composite material 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 (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. The polylactic acid material can be used in the food fields of lunch boxes, water cups and the like, has certain light aging resistance, can be applied in the fields of 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 thermal aging resistant polylactic acid composite material.
Background
The traditional plastic packaging material, plastic water cup and food box are usually made of polypropylene and polycarbonate, but the problem of difficult recovery and treatment after the plastic packaging material is used causes serious environmental pollution, and the environment-friendly high polymer material receives wide attention along with the enhancement of environmental awareness of people. Polylactic acid is a renewable resource, has good biodegradability and good mechanical strength and processability, and therefore has a wide application prospect in the field of plastic application.
However, the polylactic acid has a low glass transition temperature, so that the polylactic acid has a poor long-term heat resistance, and cannot meet the long-term use requirement in a hotter environment, which greatly limits the application range to a certain extent. Chinese patent CN201610711838.0 preparation method of heat-resistant durable polylactic acid composite material and heat-resistant durable polylactic acid composite material, disclose a through adding sisal fiber and shell micropowder after modifying, have improved the performance of polylactic acid, but its heat-resistant aging characteristic promotes apparently; chinese patent CN 201510253197.4A PLA resin toughening modification material and a preparation method thereof, which discloses that the heat aging resistance of polylactic resin is improved by adding a heat aging resistant agent, but the addition of a large amount of an auxiliary agent thereof has an influence on the degradability of the polylactic resin; chinese patent CN201610767037.6 discloses a PLA resin modified material and a preparation method thereof, which solves the problems of poor heat resistance and brittleness of polylactic acid by adding microcrystalline cellulose and a heat-resistant aging agent, but the heat-resistant aging performance of the polylactic acid is not obviously improved.
The disclosures of the above Chinese patents show that most of the methods for improving the thermal aging resistance of polylactic acid are realized by adding a thermal aging resistant agent in the prior art, so that the degradation property of polylactic acid is reduced, and the thermal aging resistance is not improved obviously.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a thermal-aging-resistant polylactic acid composite material and a preparation method thereof.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
a thermal ageing-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 adipate-terephthalate), 5-20% of diethyl tartrate modified terpene resin graft modified monomethoxypolyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer, 0.2-5% of plasticizer and 0.2-5% of lubricant.
Further, the preparation method of the monomethoxypolyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer is to prepare polylactic acid and monomethoxypolyethylene glycol into the monomethoxypolyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer by combining with the previous literature reports so as to improve the compatibility of 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 the polylactic acid for later use; 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 by using volatile organic solvents into 10-20% of polylactic acid solution and 10-20% of polyethylene glycol monomethyl ether solution in mass fraction, then adding 1-2% of tin catalyst in 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, then stirring at a high speed of 1000-2000r/min for 1-2h, then adding diethyl tartrate accounting for 2% -10% of the mass of the terpene resin, continuing stirring for 1-2h, and then cooling to room temperature to obtain the diethyl tartrate modified terpene resin.
Further, the preparation method of the diethyl tartrate modified terpene resin graft modified monomethoxypolyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer comprises the following steps: the preparation method comprises the following steps of melt blending diethyl tartrate modified terpene resin, monomethoxypolyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer, glycidyl methacrylate and tetrabutyl titanate, wherein 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 by melting, wherein the melting and mixing temperature is 160-200 ℃, the rotating speed is 500-1000r/min, and the diethyl tartrate modified terpene resin graft modified monomethoxy polyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer after chemical graft modification 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 a combination of two of tributyl citrate and polyethylene glycol.
Further, the lubricant is one or more of zinc stearate, erucamide and paraffin wax.
The preparation method of the thermal aging resistant polylactic acid composite material comprises the following steps: uniformly mixing polylactic acid, poly (butylene adipate-terephthalate), diethyl tartrate modified terpene resin graft modified monomethoxypolyethylene glycol-polylactic acid diblock copolymer, plasticizer and lubricant to obtain a mixed material; and then, melting and extruding the mixed material through a double-screw extruder at the extrusion temperature of 170-200 ℃, and cooling and granulating to obtain the thermal-aging-resistant polylactic acid composite material.
Further, before mixing, drying the polylactic acid, the polybutylene adipate-terephthalate and the diethyl tartrate modified terpene resin graft modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer at the drying temperature of 60-100 ℃ for 4-6 hours.
The polylactic acid composite material can be used in the food fields of lunch 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 resistance of the terpene resin is further improved by modifying the terpene resin with diethyl tartrate, and the heat-aging resistance of the polylactic acid composite material is improved by chemically grafting the modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer with the terpene resin modified with diethyl tartrate.
Detailed Description
The raw material information used in the examples and comparative examples is as follows:
| raw material | Manufacturer of the product |
| Polylactic acid L130 | Doudaro Bienboss |
| Poly (butylene adipate terephthalate) 801T | Tunchao of Lanshan Ltd |
| Polyethylene glycol monomethyl ether | Aladdin reagent |
| Tartaric acid diethyl ester | Hubeixing Hengshi science and technology Co., Ltd |
| Terpene resin | Hengfeng stone |
| Glycidyl methacrylate | Aladdin reagent |
| Tetrabutyl titanate | Aladdin reagent |
| Stannous octoate | Aladdin reagent |
| Ethanol | General commercial products |
The invention is further illustrated by the following specific embodiments, in which the tensile strengths in the examples and comparative examples are measured according to standard ISO 527, the bar dimensions are 170mm × 10mm × 4mm, and the tensile rate is 50 mm/min;
preparation example of diethyl tartrate modified terpene resin graft modified monomethoxypolyethylene glycol-polylactic acid diblock copolymer:
first, a monomethoxypolyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer was prepared: weighing 80% by mass of polylactic acid and 20% by mass of polyethylene glycol monomethyl ether, dissolving the polylactic acid and the polyethylene glycol monomethyl ether into 10% by mass of polylactic acid and 10% by mass of polyethylene glycol monomethyl ether solution respectively by using acetone and ethanol, then adding 1% by mass of stannous octoate catalyst 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, then adding 10% of polyvinyl alcohol into the molten terpene resin, then stirring at a high speed of 2000r/min for 2h, then adding diethyl tartrate with the mass fraction of 10% of the terpene resin, continuing stirring for 2h, and then cooling to room temperature to obtain the diethyl tartrate modified terpene resin.
Finally, preparing a diethyl tartrate modified terpene resin graft modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer: mixing the following components in percentage by mass: 40% of diethyl tartrate modified terpene resin, 40% of monomethoxypolyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer, 10% of glycidyl methacrylate and 10% of tetrabutyl titanate, and performing melt blending, wherein the melt mixing temperature is 180 ℃, the rotating speed is 500r/min, and the mixture is mixed for 10min to obtain the chemical grafting modified monomethoxypolyethylene glycol-polylactic acid (MPEG-PLA) diblock copolymer grafted by the diethyl tartrate modified terpene resin.
Example 1:
the components are as follows: 56% of polylactic acid, 20% of polybutylene adipate-terephthalate, 20% of diethyl tartrate modified terpene resin graft modified monomethoxypolyethylene 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 by a double-screw extruder at 180 ℃, 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 polybutylene adipate-terephthalate, 10% of diethyl tartrate modified terpene resin graft modified monomethoxypolyethylene 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 by a double-screw extruder at 180 ℃, 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 polybutylene adipate-terephthalate, 5% of diethyl tartrate modified terpene resin graft modified monomethoxypolyethylene 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 by a double-screw extruder at 180 ℃, 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 specimens, and the test specimens were subjected to a 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 |
| After 1000h of heat agingTensile Strength Retention% | 87.4 | 70.3 | 65.4 | 53.5 |
As can be seen from Table 1, the polylactic acid composite material prepared by the method has the advantages that the retention rate of the tensile strength after aging for 1000 hours at 85 ℃ is obviously improved, and the polylactic acid composite material has higher tensile strength.
It will be appreciated 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 in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A thermal aging resistant polylactic acid material is characterized in that: is prepared from 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.
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 or 2, wherein: the plasticizer is one or two of tributyl citrate and polyethylene glycol.
4. A polylactic acid material according to any of the claims 1 to 3, wherein: the lubricant is one or more of zinc stearate, erucamide and paraffin.
5. The polylactic acid material according to any one of claims 1 to 4, wherein: the preparation method of the diethyl tartrate modified terpene resin graft modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer comprises the following steps: the preparation method comprises the following steps of carrying out melt blending on diethyl tartrate modified terpene resin, monomethoxypolyethylene glycol-polylactic acid diblock copolymer, glycidyl methacrylate and tetrabutyl titanate, wherein 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 are melted, preferably, the melting and mixing temperature is 160-200 ℃, the rotating speed is 500-1000r/min, and the mixture is mixed for 10-30min to obtain the chemically grafted and modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer of the diethyl tartrate modified terpene resin.
6. The lactic acid material according to claim 5, characterized in that: the preparation method of the monomethoxy polyethylene glycol-polylactic acid diblock copolymer comprises the following 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 by using volatile organic solvents into 10-20% of polylactic acid solution and 10-20% of polyethylene glycol monomethyl ether solution in mass fraction, then adding 1-2% of tin catalyst in 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.
7. Lactic acid material according to claim 5 or 6, characterized in that: 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, then stirring at a high speed of 1000-2000r/min for 1-2h, then adding diethyl tartrate accounting for 2% -10% of the mass of the terpene resin, continuing stirring for 1-2h, and then cooling to room temperature to obtain the diethyl tartrate modified terpene resin.
8. The method for preparing a thermal aging-resistant polylactic acid material according to any one of claims 1 to 7, wherein: uniformly mixing polylactic acid, poly (butylene adipate-terephthalate), diethyl tartrate modified terpene resin graft modified monomethoxypolyethylene glycol-polylactic acid diblock copolymer, plasticizer and lubricant to obtain a mixed material; and then, melting and extruding the mixed material through a double-screw extruder at the extrusion temperature of 170-200 ℃, and cooling and granulating to obtain the thermal-aging-resistant polylactic acid composite material.
9. The method of claim 8, wherein: before mixing, respectively drying polylactic acid, poly (butylene adipate) -terephthalate and diethyl tartrate modified terpene resin graft modified monomethoxy polyethylene glycol-polylactic acid diblock copolymer at 60-100 ℃ for 4-6 hours.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114957932A (en) * | 2022-06-02 | 2022-08-30 | 广东高景太阳能科技有限公司 | Plastic plate for cutting photovoltaic solar silicon wafer and preparation method and application thereof |
| CN115678225A (en) * | 2022-10-27 | 2023-02-03 | 万华化学（宁波）有限公司 | High-heat-resistance polylactic acid composite material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| 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 |
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| 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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| US4994508A (en) * | 1987-07-16 | 1991-02-19 | Asahi Kasei Kogyo Kabushiki Kaisha | Specific hydrogenated block copolymer composition and process for producing the same |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114957932A (en) * | 2022-06-02 | 2022-08-30 | 广东高景太阳能科技有限公司 | Plastic plate for cutting photovoltaic solar silicon wafer and preparation method and application thereof |
| CN115678225A (en) * | 2022-10-27 | 2023-02-03 | 万华化学（宁波）有限公司 | High-heat-resistance polylactic acid composite material and preparation method thereof |
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