Modified polylactic acid composite material and application thereof

Abstract

This invention discloses a modified polylactic acid (PLA) composite material and its applications. By weight percentage, the raw materials of the modified PLA composite material include 15-50% PLA; 15-50% polybutylene succinate; 15-50% polybutylene adipate-terephthalate; 1-5% compatibilizer; 0.1-1% antioxidant; 0.1-5% release agent; 0.1-1% melt flow modifier; 0.1-5% nucleating agent; and 0.1-1% anti-hydrolysis agent. The compatibilizer includes elastomers containing epoxy groups, elastomers containing maleic anhydride groups, ethylene-methyl acrylate random copolymers, and ethylene-butyl acrylate copolymers, with the weight ratio of the elastomer containing epoxy groups to the elastomer containing maleic anhydride groups being 1:4 to 4:1. This modified PLA composite material exhibits good flowability and mechanical properties, making it suitable for injection molding to prepare cable ties.

Description

Technical Field

[0001] This invention belongs to the field of modified polylactic acid materials, and relates to a modified polylactic acid composite material and its application, particularly in the preparation of thin-walled products with a large aspect ratio (such as cable ties). Background Technology

[0002] Most civilian cable ties are disposable items and are often disposed of together with household waste through sanitary landfill, incineration power generation, composting, thermal oxidation, and microbial treatment. Biodegradable plastic cable ties can meet the requirements of these disposal methods, reducing the negative environmental impact of used cable ties and achieving carbon reduction and emission reduction in this specific sector, thus reducing the problem of white pollution.

[0003] Cable ties are thin-walled products with a high aspect ratio, typically manufactured through injection molding. Their production process demands very high material flowability and thermal stability. Furthermore, as application scenarios change, specific requirements arise for the product's mechanical properties, high and low temperature performance, and environmental humidity adaptability. In other words, current production technology cannot yet meet the needs of biodegradable plastics for cable ties. Summary of the Invention

[0004] The purpose of this invention is to provide a modified polylactic acid (PLA) composite material with good flowability and mechanical properties, suitable for injection molding to manufacture cable ties. This invention also provides an application of this modified PLA composite material in injection molding of thin-walled, high aspect ratio products.

[0005] The first aspect of the present invention provides a modified polylactic acid composite material, wherein the raw materials comprise, by weight percentage:

[0006] Polylactic acid 15-50%;

[0007] Polybutylene succinate 15-50%;

[0008] Polybutylene adipate terephthalate 15~50%;

[0009] Compatibilizer 1~8%;

[0010] Antioxidant 0.1-1%;

[0011] Release agent 0.1~5%;

[0012] Melt flow modifier 0.1~1%;

[0013] Nucleating agent 0.1-5%;

[0014] Anti-hydrolysis agent 0.1~1%;

[0015] The compatibilizer includes an elastomer containing epoxy groups, an elastomer containing maleic anhydride groups, an ethylene-methyl acrylate random copolymer, and an ethylene-butyl acrylate copolymer, wherein the weight ratio of the elastomer containing epoxy groups to the elastomer containing maleic anhydride groups is 1:4 to 4:1.

[0016] In a preferred embodiment, the compatibilizer comprises 2-5% by weight in the raw material, more preferably 2-4%. In a more preferred embodiment, the elastomer containing epoxy groups is selected from one or more combinations of ethylene-methyl acrylate-glycidyl methacrylate random terpolymer, ethylene-ethyl acrylate-glycidyl methacrylate, glycidyl methacrylate-polyolefin elastomer, glycidyl methacrylate-grafted ethylene-vinyl acetate copolymer, ethylene-butyl acrylate-glycidyl methacrylate terpolymer, and ethylene-glycidyl methacrylate random copolymer; the elastomer containing maleic anhydride groups is selected from one or more combinations of maleic anhydride-grafted styrene-ethylene / butene-styrene block copolymer, maleic anhydride-grafted polyolefin elastomer, maleic anhydride-grafted ethylene-vinyl acetate copolymer, maleic anhydride-grafted ethylene propylene diene monomer (EPDM) rubber, and maleic anhydride-grafted ethylene propylene diene monomer (EPDM) rubber.

[0017] In a preferred embodiment, the antioxidant comprises one or more combinations selected from antioxidant 1076, antioxidant 1010, antioxidant 626, and antioxidant 168. In a specific and preferred embodiment, the antioxidant comprises one selected from antioxidant 1076, antioxidant 1010, and antioxidant 626 combined with antioxidant 168 in a weight ratio of (0.5~2):1. More preferably, the weight ratio of one selected from antioxidant 1076, antioxidant 1010, and antioxidant 626 to antioxidant 168 is 1:1.

[0018] In a preferred embodiment, the release agent comprises 1-3% by weight of the raw material. More preferably, the release agent comprises one or more of pentaerythritol tristearate, vinyl bis-stearamide, calcium stearate, sodium stearate, magnesium stearate, and high-temperature lubricating dispersant 603A. In an even more preferred embodiment, the release agent comprises pentaerythritol tristearate and high-temperature lubricating dispersant 603A.

[0019] In a preferred embodiment, the melt flow conditioner comprises one or more combinations selected from hyperbranched polyester polymers, methylcellulose, hydroxypropylcellulose, and hydroxypropyl methylcellulose. In a specific and preferred embodiment, the melt flow conditioner is a hyperbranched polyester polymer, such as HyPer C181.

[0020] In a preferred embodiment, the nucleating agent is composed of an organic nucleating agent and an inorganic nucleating agent in a weight ratio of 2:1 to 10:1. In a more preferred embodiment, the weight ratio of the organic nucleating agent to the inorganic nucleating agent is 2:1 to 5:1.

[0021] In a more preferred embodiment, the organic nucleating agent comprises a combination of one or more selected from pentaerythritol, dipentaerythritol, and trimellipentaerythritol, and the inorganic nucleating agent comprises one or more selected from talc, nano-montmorillonite, organobentonite, talc, zeolite, palygorskite, hydropyrite, halloysite, kaolin, sepiolite, and carbon black, wherein the particle size of the inorganic nucleating agent is 1-5 micrometers. In a specific and preferred embodiment, the nucleating agent is composed of trimellipentaerythritol and talc or nano-montmorillonite in a weight ratio of 2:1 to 5:1.

[0022] In a preferred embodiment, the anti-hydrolysis agent comprises 0.1-0.5% by weight in the raw material. More preferably, the anti-hydrolysis agent includes one or more combinations of epoxy compounds, carbodiimides, isocyanates, oxazolines, acid anhydrides, and glycidyl ethers. Epoxy compounds include epoxy resins S720, Joncryl 4468, etc.; isocyanates include IPDI, TDI, MDI, HDI, etc.; and acid anhydrides include pyromellitic anhydride.

[0023] In a preferred embodiment, the raw material further includes calcium sulfate whiskers. In a more preferred embodiment, the calcium sulfate whiskers constitute 2-10% by weight of the raw material, preferably 3-5%. The weight percentage of calcium sulfate whiskers in the raw material can be, for example: 2%, 3%, 3.2%, 3.4%, 3.5%, 3.6%, 3.8%, 4%, 4.2%, 4.4%, 4.5%, 4.6%, 4.8%, 5%, 6%, 7%, 8%, 9%, or 10%.

[0024] In one embodiment, a modified polylactic acid composite material is provided, wherein the raw materials of the modified polylactic acid composite material include, by weight percentage:

[0025] Polylactic acid 15-50%

[0026] Polybutylene succinate 15-50%

[0027] Polybutylene adipate terephthalate 15~50%

[0028] Processing aids 5.1~15%;

[0029] The processing aids include nucleating agents, which constitute 0.1-5% of the raw materials by weight. The nucleating agents are composed of trimeric pentaerythritol and an inorganic nucleating agent in a weight ratio of 2:1-10:1. Further, the processing aids also include one or more combinations of compatibilizers, antioxidants, release agents, melt flow modifiers, and anti-hydrolysis agents.

[0030] In another embodiment, a modified polylactic acid composite material is provided, wherein the raw materials of the modified polylactic acid composite material include, by weight percentage:

[0031] Polylactic acid 15-50%

[0032] Polybutylene succinate 15-50%

[0033] Polybutylene adipate terephthalate 15~50%

[0034] Processing aids 5.1~15%;

[0035] The processing aids include compatibilizers, which constitute 1-8% of the raw materials by weight, preferably 2-5%. The compatibilizers comprise elastomers containing epoxy groups and elastomers containing maleic anhydride groups in a weight ratio of 1:4 to 4:1. Further, the processing aids also include one or more combinations of nucleating agents, antioxidants, release agents, melt flow modifiers, and anti-hydrolysis agents.

[0036] In another embodiment, a modified polylactic acid composite material is provided, wherein the raw materials of the modified polylactic acid composite material include, by weight percentage:

[0037] Polylactic acid 15-50%

[0038] Polybutylene succinate 15-50%

[0039] Polybutylene adipate terephthalate 15~50%

[0040] Processing aids 5.1~15%;

[0041] The processing aids include a release agent, which accounts for 0.1-5% of the raw material by weight. The release agent comprises a mixture selected from pentaerythritol tristearate and / or high-temperature lubricating dispersant 603A. Further, the processing aids also include one or more combinations of nucleating agents, antioxidants, compatibilizers, melt flow modifiers, and anti-hydrolysis agents.

[0042] A second aspect of the present invention provides the application of the modified polylactic acid composite material described above in injection-molded thin-walled articles with a large aspect ratio.

[0043] In a preferred embodiment, the thin-walled, high aspect ratio article includes cable ties.

[0044] In a specific and preferred embodiment, the cable tie is a fishbone cable tie. The fishbone cable tie has multiple pairs of lugs on its body, which are spaced apart along the length of the cable tie, forming an overall shape similar to a fishbone.

[0045] In another specific and preferred embodiment, the cable tie is a self-locking cable tie. The head of the self-locking cable tie has a locking hole through which its tail passes, and the locking hole has a locking tongue that engages with the teeth on the tail.

[0046] In one embodiment, the aspect ratio of the thin-walled article with a large aspect ratio is greater than 2:1, preferably 10:1 to 5000:1, more preferably 100:1 to 5000:1; the thickness is less than the width.

[0047] The present invention, by adopting the above technical solution, has the following beneficial effects:

[0048] The modified polylactic acid composite material of the present invention is based on polylactic acid, polybutylene succinate, and polybutylene adipate-terephthalate, with the addition of processing aids such as compatibilizers, release agents, nucleating agents, and melt flow modifiers. The compatibilizers are a combination of two types of compatibilizers: elastomers containing epoxy groups and elastomers containing maleic anhydride groups. This effectively improves the material's fluidity and thermal stability, shortens the molding cycle, and makes it suitable for preparing thin-walled products with a large aspect ratio (such as cable ties). The injection-molded cable ties have good toughness and high and low temperature performance, meeting the mechanical property requirements such as cable tie strength. Attached Figure Description

[0049] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 The experimental site photos show the fishbone cable ties prepared for this example.

[0051] Figure 2 The experimental photos show the self-locking cable ties prepared for this example. Detailed Implementation

[0052] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] Cable ties are thin-walled products with a high aspect ratio, typically manufactured through injection molding. Their production process demands very high material flowability and thermal stability. Furthermore, as application scenarios change, specific requirements arise for the product's mechanical properties, high and low temperature performance, and environmental humidity adaptability. The modified polylactic acid composite material described in the following embodiments significantly improves the material's flowability and thermal stability to a certain extent, resulting in injection-molded fishbone cable ties with good toughness and high and low temperature performance. Self-locking cable ties have even higher requirements for raw materials, particularly in terms of flowability, release properties, and ring tensile strength. The modified polylactic acid composite material described in the following embodiments can also meet the requirements of self-locking cable ties, enabling injection molding of compliant self-locking cable ties.

[0054] A biodegradable composition comprising:

[0055] Polylactic acid 15-50%

[0056] Polybutylene succinate 15-50%

[0057] Polybutylene adipate terephthalate 15~50%

[0058] Processing aids: 5.1-15%.

[0059] Processing aids may include: compatibilizers, nucleating agents, antioxidants, release agents, melt flow modifiers, and anti-hydrolysis agents. For example, the weight percentage of each aid in the raw material may be: calcium sulfate whiskers 2-10%, nucleating agent 0.1-5%, melt flow modifier 0.1-1%, compatibilizer 0.1-8%, antioxidant 0.1-1%, release agent 0.1-5%, and anti-hydrolysis agent 0.1-1%, etc. All percentages mentioned above refer to the weight percentage of the corresponding component in the raw material.

[0060] The compatibilizer is composed of an elastomer containing epoxy groups, an elastomer containing maleic anhydride groups, an ethylene-methyl acrylate random copolymer, and an ethylene-butyl acrylate copolymer. The mass ratio of the elastomer containing epoxy groups to the elastomer containing maleic anhydride groups is 1:4 to 4:1, preferably 1:2 to 2:1. The amount of compatibilizer in the composition is 1 to 8% of the total mass of the raw materials, preferably 2 to 5%. The elastomer containing epoxy groups is selected from two or more combinations of ethylene-methyl acrylate-glycidyl methacrylate random terpolymer (lotader® AX8900), ethylene-ethyl acrylate-glycidyl methacrylate (Elvaloy® PTW), glycidyl methacrylate-polyolefin elastomer, glycidyl methacrylate-grafted ethylene-vinyl acetate copolymer, ethylene-butyl acrylate-glycidyl methacrylate terpolymer (lotader® AX8700), and ethylene-glycidyl methacrylate random copolymer (lotader® AX8840). The elastomer containing maleic anhydride groups is selected from two or more combinations of maleic anhydride-grafted styrene-ethylene / butene-styrene block copolymers, maleic anhydride-grafted polyolefin elastomers, maleic anhydride-grafted ethylene-vinyl acetate copolymers, maleic anhydride-grafted ethylene propylene diene monomer (EPDM) rubber, and maleic anhydride-grafted ethylene propylene diene monomer (EPDM) rubber. Further, the compatibilizer includes both reactive and non-reactive compatibilizers. The elastomers containing epoxy groups and maleic anhydride groups described above are reactive compatibilizers, while the ethylene-methyl acrylate random copolymer (lotryl®29MA03) and ethylene-butyl acrylate copolymer (lotryl®35BA40) described above are non-reactive compatibilizers. The mass ratio of reactive to non-reactive compatibilizers is 1:1 to 3:1, preferably 3:2.

[0061] The antioxidant is a combination of one of antioxidants 1076, antioxidant 1010, and antioxidant 626 with antioxidant 168 in a 1:1 ratio.

[0062] The release agent is selected from one or more of pentaerythritol tristearate (PETS-3), vinyl bis-stearamide, calcium stearate, sodium stearate, magnesium stearate, and high-temperature lubricating dispersant 603A.

[0063] The melt flow modifier is selected from one or more combinations of hyperbranched polyester polymers, methylcellulose, hydroxypropylcellulose, and hydroxypropylmethylcellulose.

[0064] The nucleating agent is composed of an organic nucleating agent and an inorganic nucleating agent in a ratio of 2 to 10:1, with the preferred weight ratio being 2:1 to 5:1. The organic nucleating agent includes, but is not limited to, pentaerythritol, dimeric pentaerythritol, and trimermeric pentaerythritol, while the inorganic nucleating agent includes, but is not limited to, talc and nano-montmorillonite. The particle size of the inorganic nucleating agent is between 1 and 5 micrometers.

[0065] The anti-hydrolysis agent is selected from one or more combinations of epoxy compounds (epoxy resin S720, Joncryl 4468, etc.), carbodiimide, isocyanates (IPDI, TDI, MDI, HDI), oxazoline compounds, acid anhydrides (pyromellitic anhydride), and glycidyl ethers.

[0066] The raw materials for the modified polylactic acid composite material may include polylactic acid, polybutylene succinate, polybutylene adipate terephthalate and calcium sulfate whiskers, wherein the calcium sulfate whiskers account for 2 to 10% by weight of the raw materials, preferably 3 to 5%.

[0067] The raw materials for modified polylactic acid composite materials may include polylactic acid, polybutylene succinate, polybutylene adipate-terephthalate, and a nucleating agent. The nucleating agent is composed of an organic nucleating agent and an inorganic nucleating agent in a weight ratio of 2:1 to 10:1. Further, the organic nucleating agent includes a combination of one or more selected from pentaerythritol, dipentaerythritol, and trimerpentaerythritol, and the inorganic nucleating agent includes one or more selected from talc, nano-montmorillonite, organobentonite, talc, zeolite, palygorskite, hydropyrite, halloysite, kaolin, sepiolite, and carbon black, with a particle size of 1 to 5 micrometers. Even further, the nucleating agent is composed of trimerpentaerythritol and talc or nano-montmorillonite in a weight ratio of 2:1 to 5:1.

[0068] The raw materials for modified polylactic acid composites may include polylactic acid, polybutylene succinate, polybutylene adipate-terephthalate, and melt flow modifiers, including trimeric pentaerythritol.

[0069] In one embodiment, a modified polylactic acid composite material comprises, by weight percentage:

[0070] Polylactic acid 15-50%

[0071] Polybutylene succinate 15-50%

[0072] Polybutylene adipate terephthalate 15~50%

[0073] Processing aids 5.1~15%;

[0074] The processing aid includes a nucleating agent, which has a weight percentage of 0.1-5% in the raw material, preferably 1-3%, and more preferably 1-2%. The nucleating agent is composed of trimeric pentaerythritol and an inorganic nucleating agent in a weight ratio of 2:1 to 10:1. The weight ratio of the organic nucleating agent to the inorganic nucleating agent is preferably 2:1-5:1. The organic nucleating agent includes, but is not limited to, pentaerythritol, dimeric pentaerythritol, and trimeric pentaerythritol, while the inorganic nucleating agent includes, but is not limited to, talc and nano-montmorillonite, with a particle size between 1 and 5 micrometers. Further, the processing aid also includes one or more combinations of the above-mentioned compatibilizers, antioxidants, release agents, melt flow modifiers, and anti-hydrolysis agents.

[0075] In another embodiment, a modified polylactic acid composite material, by weight percentage, comprises the following raw materials:

[0076] Polylactic acid 15-50%

[0077] Polybutylene succinate 15-50%

[0078] Polybutylene adipate terephthalate 15~50%

[0079] Processing aids 5.1~15%;

[0080] The processing aid includes a compatibilizer, which has a weight percentage of 1-8% in the raw material, preferably 2-5%. The compatibilizer comprises an elastomer containing epoxy groups and an elastomer containing maleic anhydride groups in a weight ratio of 1:4-4:1. The weight ratio of the elastomer containing epoxy groups to the elastomer containing maleic anhydride groups is preferably 1:2-2:1. The elastomer containing epoxy groups is selected from two or more combinations of ethylene-methyl acrylate-glycidyl methacrylate random terpolymer (lotader® AX8900), ethylene-ethyl acrylate-glycidyl methacrylate (Elvaloy® PTW), glycidyl methacrylate-polyolefin elastomer, glycidyl methacrylate-grafted ethylene-vinyl acetate copolymer, ethylene-butyl acrylate-glycidyl methacrylate terpolymer (lotader® AX8700), and ethylene-glycidyl methacrylate random copolymer (lotader® AX8840). Elastomers containing maleic anhydride groups are selected from two or more combinations of maleic anhydride-grafted styrene-ethylene / butene-styrene block copolymers, maleic anhydride-grafted polyolefin elastomers, maleic anhydride-grafted ethylene-vinyl acetate copolymers, maleic anhydride-grafted ethylene propylene diene monomer (EPDM) rubber, and maleic anhydride-grafted ethylene propylene diene monomer (EPDM) rubber. Compatibilizers also include ethylene-methyl acrylate random copolymers (lotryl® 29MA03) and ethylene-butyl acrylate copolymers (lotryl® 35BA40).

[0081] Furthermore, processing aids also include one or more combinations of the above-mentioned nucleating agents, antioxidants, release agents, melt flow modifiers, and anti-hydrolysis agents.

[0082] In another embodiment, a modified polylactic acid composite material is provided, wherein the raw materials of the modified polylactic acid composite material include, by weight percentage:

[0083] Polylactic acid 15-50%

[0084] Polybutylene succinate 15-50%

[0085] Polybutylene adipate terephthalate 15~50%

[0086] Processing aids 5.1~15%;

[0087] The processing aids include a release agent, which has a weight percentage of 0.1-5% in the raw materials, preferably 0.2-3%, more preferably 0.2-2%, and further preferably 0.5-1%. The release agent includes pentaerythritol tristearate (PETS-3) and / or high-temperature lubricating dispersant 603A. Using pentaerythritol tristearate (PETS-3) in combination with inorganic nucleating agents, etc., pentaerythritol tristearate (PETS-3) has an independent hydroxyl group that can form hydrogen bonds with the matrix resin, resulting in better bonding, less migration, and better overall improvement of the composition's performance. The release agent also includes one or more combinations selected from vinyl bis-stearamide, calcium stearate, sodium stearate, and magnesium stearate. Further, the processing aids also include one or more combinations of the above-mentioned nucleating agents, antioxidants, compatibilizers, melt flow modifiers, and anti-hydrolysis agents.

[0088] In one embodiment, a cable tie is manufactured by injection molding from the aforementioned modified polylactic acid composite material. The cable tie is a herringbone cable tie or a self-locking cable tie.

[0089] Several typical implementation examples are listed below.

[0090] Raw materials:

[0091] Polylactic acid (PLA): Anhui Fengyuan Futailai Polylactic Acid Co., Ltd.

[0092] Polybutylene succinate (PBS): Lanshan Tunhe Polyester Co., Ltd.

[0093] Polybutylene adipate / terephthalate (PBAT): Lanshan Tunhe Polyester Co., Ltd.

[0094] Calcium sulfate whiskers (CSW): Henan Kaixiang Fine Chemical Co., Ltd.

[0095] AX8900: SK Chemicals

[0096] 29MA03: SK Chemicals

[0097] 35BA40: SK Chemicals

[0098] PTW: DuPont

[0099] POE-g-MA: Ningbo Nengzhiguang New Material Technology Co., Ltd.

[0100] Antioxidant 1076: Tianjin Lianlong New Materials Co., Ltd.

[0101] Antioxidant 168: Tianjin Lianlong New Material Co., Ltd.

[0102] High-Temperature Lubricating Dispersant 603A: Qingdao Sainuo New Materials Co., Ltd.

[0103] Calcium stearate: Anhui Shafeng New Materials Co., Ltd.

[0104] Pentaerythritol Tristearate (PETS-3): Jiaxing Zhongcheng Environmental Protection Technology Co., Ltd.

[0105] Hydroxypropyl cellulose: Tianjin Huasheng Chemical Reagent Co., Ltd.

[0106] Pentaerythritol Trimer: Yunnan Yuntianhua Co., Ltd.

[0107] Talc: Shenzhen Jinhaohui Industrial Development Co., Ltd.

[0108] Nano-montmorillonite: Zhejiang Fenghong New Material Co., Ltd.

[0109] Joncryl 4468: BASF

[0110] Hyperbranched polyester polymer HyPer C181: Wuhan Hyperbranched Resin Technology Co., Ltd.

[0111] Examples 1-10

[0112] Weigh and mix the raw materials according to Table 1, and extrude to obtain modified polylactic acid composite material. Use this composition to injection mold cable ties (all with specifications of 3.6mm × 205mm). Figure 1 and Figure 2 Photographs of fishbone cable ties and self-locking cable ties are shown respectively. Their performance is described in Table 2.

[0113] Table 1: Formulation Table of Examples

[0114]

[0115] Table 2: Performance Comparison of Examples

[0116]

[0117] In Table 2, small burrs can be eliminated through post-processing, while the flash appearing in the comparative examples below cannot be eliminated.

[0118] Comparative Examples 1-11

[0119] Weigh and mix the raw materials according to Table 3, and extrude to obtain modified polylactic acid composite material. Use this composition to injection mold cable ties (all with specifications of 3.6mm × 205mm). The properties are shown in Table 4.

[0120] Table 3: Comparative Formula Table

[0121]

[0122] Table 4: Comparison of Performance of Comparative Examples

[0123]

[0124] Test method:

[0125] The tensile property test method refers to ISO 527-2:1993 Determination of tensile properties of plastics, Part 2: Test conditions for molding and extrusion plastics;

[0126] The bending performance test method refers to ISO 178:2001 Plastics bending performance test;

[0127] Low-temperature brittleness test method: 20 samples are placed in a group, frozen at a set temperature for 4 hours, removed and quickly folded in half, and the percentage of samples that pass the test is calculated.

[0128] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements. The term "and / or" as used herein includes any combination of one or more of the associated listed items.

[0129] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0130] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. In the event of any contradiction or inconsistency between the definitions used herein and those contained in other published documents, the definitions used herein shall prevail.

[0131] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and they should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made according to the principles of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A modified polylactic acid composite material, characterized in that, By weight percentage, its raw materials include: Polylactic acid 15-50%; Polybutylene succinate 15-50%; Polybutylene adipate terephthalate 15~50%; Compatibilizer 1~8%; Antioxidant 0.1-1%; Release agent 0.1~5%; Melt flow modifier 0.1~1%; Nucleating agent 0.1~5%; Anti-hydrolysis agent 0.1~1%; The compatibilizer is composed of ethylene-methyl acrylate-glycidyl methacrylate random terpolymer, ethylene-methyl acrylate random copolymer, ethylene-butyl acrylate random copolymer, ethylene-butyl acrylate-glycidyl methacrylate random terpolymer and maleic anhydride-grafted POE in a weight ratio of 1:1:1:1:1:

1. The antioxidant is a combination of antioxidant 1076 and antioxidant 168 in a 1:1 weight ratio; The release agent is pentaerythritol tristearate, calcium stearate, and high-temperature resistant lubricating dispersant 603A; The nucleating agent is composed of an organic nucleating agent and an inorganic nucleating agent in a weight ratio of 2:1 to 10:

1. The organic nucleating agent is pentaerythritol, and the inorganic nucleating agent is talc or nano-montmorillonite. The anti-hydrolysis agent is Joncryl 4468; The melt flow modifier is a hyperbranched polyester polymer, HyPer C181.

2. The modified polylactic acid composite material according to claim 1, characterized in that, The raw materials also include calcium sulfate whiskers, with the calcium sulfate whiskers accounting for 2 to 10% of the weight percentage of the raw materials.

3. The application of a modified polylactic acid composite material as described in any one of claims 1 to 2 in injection molding articles having an aspect ratio of 10:1 to 5000:1 and a thickness less than the width.

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