CN116376249A - Super-tough PLA/SiR blend and preparation method thereof - Google Patents
Super-tough PLA/SiR blend and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention belongs to the technical field of high polymer materials, and particularly relates to a super-tough PLA/SiR blend and a preparation method thereof. Polylactic acid, silicon rubber and glycidyl methacrylate grafted silicon rubber (SiR-g-GMA) are used as raw materials to prepare the super-tough low-temperature impact resistant PLA/SiR blend. The SiR-g-GMA copolymer is used as a reactive compatibilizer, can be subjected to grafting reaction with hydroxyl ends and carboxyl groups in PLA molecular chains, and improves the acting force of a two-phase interface between PLA and SiR. The PLA/SiR blend has excellent low-temperature impact resistance, and the impact strength can reach 75kJ/m at the temperature of minus 20 DEG C 2 Greatly expandApplication scope of PLA/SiR blend. The invention has simple process, common equipment, easy realization of industrial production and wide sources of the used raw materials.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a super-tough PLA/SiR blend and a preparation method thereof.
Background
Polylactic acid (PLA) is an aliphatic polyester which is obtained by taking crop fruits or crop straws as raw materials, extracting and fermenting the raw materials to obtain lactic acid monomers, and then synthesizing the lactic acid monomers chemically, has good biocompatibility, can be completely degraded in nature, and the degraded end products are water and carbon dioxide, so that the environment is not polluted. Meanwhile, the polylactic acid has higher tensile strength (more than 60 MPa), is easy to process and mold and low in price, but the polylactic acid has poorer toughness and is easy to break, so that the application range of the polylactic acid is greatly limited.
SiR is polysiloxane formed by taking a silicon-oxygen bond as a framework, is the most widely studied and widely applied type of organosilicon compounds, and has the advantages of high thermal stability, excellent low-temperature performance, excellent electrical insulation, weather resistance, ozone resistance and air permeability, no toxicity and no smell.
Therefore, PLA and SiR are blended to prepare the super-tough material, and the advantages and disadvantages of the two materials are complemented. However, the polylactic acid and silicone rubber blend prepared by simple blending has poor compatibility and very limited improvement of toughness.
Disclosure of Invention
The invention aims to develop a super-tough PLA/SiR blend and a preparation method thereof.
The super-tough PLA/SiR blend comprises the following raw materials in parts by mass:
PLA (polylactic acid) comprises the following components in parts by mass: 100 parts of SiR mixed rubber: 10-25 parts of SiR-g-GMA copolymer, and the weight parts of SiR-g-GMA copolymer: 5-15 parts of vulcanizing agent: 0.1-1.0 parts.
The preparation method of SiR-g-GMA comprises the following steps:
100 parts of silicone rubber and 5-20 parts of Glycidyl Methacrylate (GMA) are accurately weighed and mixed uniformly in advance, the temperature is 160-185 ℃, the rotating speed is 30-50rpm, after 3 minutes of mixing, 0.1-1.0 part of DCP vulcanizing agent is added for carrying out grafting reaction and refining for 12 minutes, and then the products are collected, so that the grafted product SiR-g-GMA of the silicone rubber and the GMA is obtained.
The preparation method of the SiR rubber compound comprises the following steps:
firstly, an internal mixer is started, the temperature is 70 ℃, the rotating speed is 30-50rpm, and the internal mixer is accurately called100 parts of silicon rubber SiR, 10-50 parts of gas phase SiO 2 1-5 parts of hydroxyl silicone oil, and sequentially adding gas-phase SiO into a beaker 2 The mass fraction of the hydroxyl silicone oil is gas phase SiO 2 10% of (C). SiO in gas phase in a high-speed stirrer 2 Mixing with hydroxy silicone oil. After the temperature of the internal mixer reaches 180 ℃, adding silicon rubber SiR, uniformly pouring the mixture into the internal mixer for 8-30min, and collecting the product.
The invention also provides a preparation method of the PLA/SiR blend, which comprises the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer in proportion, carrying out melt mixing for 3-5min in the internal mixer, then adding a vulcanizing agent bis-di-penta (DBPMH) for reacting for 5-8min, and obtaining the PLA/SiR blend by heating at 180-195 ℃ and rotating at 30-50rpm.
The SiR-g-GMA and SiR rubber compound polymer prepared by the method is added into a PLA blending system, and the addition amount of the SiR-g-GMA and SiR rubber compound in the blending system is 15-40 parts.
The invention has the beneficial effects that:
1. according to the invention, PLA, siR-g-GMA and SiR rubber compound copolymer are melt blended, and SiR-g-GMA polymer is added into PLA/SiR blend, so that the compatibility of PLA and SiR is improved. When in melt blending, epoxy groups in GMA can react with hydroxyl and carboxyl in PLA molecular chains and methyl in silicone rubber, so that the acting force of PLA and SiR two-phase interfaces is improved, and the mechanical property of the polymer is obviously improved. The prepared PLA/SiR blend has high strength of PLA and better toughness and ductility of SiR.
2. PLA and SiR are both environmentally friendly materials, PLA has excellent biocompatibility and biodegradability, so PLA/SiR blends have great application potential in the field of disposable packaging.
Drawings
FIG. 1 is a quenched profile electron micrograph of the blend of example 16 (a) and comparative example 1 (b).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in connection with the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
100 parts of silicone rubber and 5 parts of GMA are weighed and mixed uniformly in advance, the mixture is poured into an internal mixer, the internal mixing temperature is 160 ℃, the rotating speed is 30rpm, 0.1 part of DCP is added after 3 minutes of blending for grafting reaction, and after 12 minutes of reaction, the products are collected, so that the grafted product SiR-g-GMA of the silicone rubber and the GMA is obtained.
Example 2
100 parts of silicone rubber and 10 parts of GMA are weighed and mixed uniformly in advance, the mixture is poured into an internal mixer, the internal mixing temperature is 170 ℃, the rotating speed is 40rpm, 0.5 part of DCP is added after 3 minutes of blending for grafting reaction, and after 12 minutes of reaction, the products are collected, so that the grafted product SiR-g-GMA of the silicone rubber and the GMA is obtained.
Example 3
100 parts of silicone rubber and 20 parts of GMA are weighed and mixed uniformly in advance, the mixture is poured into an internal mixer, the internal mixing temperature is 185 ℃, the rotating speed is 50rpm, 1 part of DCP is added after 3 minutes of blending for grafting reaction, and after 12 minutes of reaction, the products are collected, so that the grafted product SiR-g-GMA of the silicone rubber and the GMA is obtained.
Example 4
Firstly, an internal mixer is opened, the temperature is 70 ℃, the rotating speed is 30rpm, 100 parts of SiR and 10 parts of gas phase SiO are accurately weighed 2 Sequentially adding gas phase SiO into a beaker 2 1 part of hydroxyl silicone oil, wherein the mass fraction of the hydroxyl silicone oil is gas phase SiO 2 10% of (C). SiO in gas phase in a high-speed stirrer 2 Mixing with hydroxy silicone oil. After the temperature of the internal mixer reaches 180 ℃, siR is added first, then evenly and separately poured into the mixture, and after 8min of internal mixing, the product is collected.
Example 5
Firstly, an internal mixer is opened, the temperature is 70 ℃, the rotating speed is 30rpm, 100 parts of SiR and 20 parts of gas phase SiO are accurately weighed 2 Sequentially adding gas phase SiO into a beaker 2 2 parts of hydroxyl silicone oil, wherein the mass fraction of the hydroxyl silicone oil is gas phase SiO 2 10% of (C).SiO in gas phase in a high-speed stirrer 2 Mixing with hydroxy silicone oil. After the temperature of the internal mixer reaches 180 ℃, siR is added first, then evenly and separately poured into the mixture, and after 13min of internal mixing, the product is collected.
Example 6
Firstly, an internal mixer is opened, the temperature is 70 ℃, the rotating speed is 40rpm, 100 parts of SiR and 30 parts of gas phase SiO are accurately weighed 2 Sequentially adding gas phase SiO into a beaker 2 3 parts of hydroxyl silicone oil, wherein the mass fraction of the hydroxyl silicone oil is gas phase SiO 2 10% of (C). SiO in gas phase in a high-speed stirrer 2 Mixing with hydroxy silicone oil. After the temperature of the internal mixer reaches 180 ℃, siR is added first, then evenly and separately poured into the mixture, and after banburying for 18min, the product is collected.
Example 7
Firstly, an internal mixer is opened, the temperature is 70 ℃, the rotating speed is 50rpm, 100 parts of SiR and 40 parts of gas phase SiO are accurately weighed 2 Sequentially adding gas phase SiO into a beaker 2 4 parts of hydroxyl silicone oil, wherein the mass fraction of the hydroxyl silicone oil is gas phase SiO 2 10% of (C). SiO in gas phase in a high-speed stirrer 2 Mixing with hydroxy silicone oil. After the temperature of the internal mixer reaches 180 ℃, siR is added first, then evenly and separately poured into the mixture, and after banburying for 23min, the product is collected.
Example 8
Firstly, an internal mixer is opened, the temperature is 70 ℃, the rotating speed is 50rpm, 100 parts of SiR and 50 parts of gas phase SiO are accurately weighed 2 Sequentially adding gas phase SiO into a beaker 2 5 parts of hydroxyl silicone oil, wherein the mass fraction of the hydroxyl silicone oil is gas phase SiO 2 10% of (C). SiO in gas phase in a high-speed stirrer 2 Mixing with hydroxy silicone oil. After the temperature of the internal mixer reaches 180 ℃, siR is added first, then evenly and separately poured into the mixture, and after banburying for 30min, the product is collected.
Example 9
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight:
100 parts of PLA, 5 parts of SiR-g-GMA (example 1), 10 parts of SiR rubber compound (example 4) and 0.8 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 3min in the internal mixer, then adding 0.8 part of DBPMH for reaction for 5min, and obtaining the PLA/SiR blend by heating the internal mixer at 180 ℃ and rotating a rotor at 30 rpm.
Example 10
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight: 100 parts of PLA, 5 parts of SiR-g-GMA (example 1), 10 parts of SiR rubber compound (example 5) and 0.3 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 4min in the internal mixer, then adding 0.3 part of DBPMH for reaction for 8min, and obtaining the PLA/SiR blend by heating the internal mixer at 185 ℃ and rotating a rotor at 40 rpm.
Example 11
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight: 100 parts of PLA, 15 parts of SiR-g-GMA (example 1), 10 parts of SiR rubber compound (example 6) and 0.5 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 6min in the internal mixer, then adding 0.5 part of DBPMH for reaction for 7min, and obtaining the PLA/SiR blend by heating the internal mixer at 190 ℃ and the rotor rotating speed of 50rpm.
Example 12
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight:
100 parts of PLA, 10 parts of SiR-g-GMA (example 2), 10 parts of SiR rubber compound (example 6) and 0.5 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 3min in the internal mixer, then adding 0.5 part of DBPMH for reaction for 6min, and obtaining the PLA/SiR blend by heating the internal mixer at 190 ℃ and the rotor rotating speed of 40 rpm.
Example 13
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight:
100 parts of PLA, 5 parts of SiR-g-GMA (example 2), 10 parts of SiR rubber compound (example 7) and 0.8 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 5min in the internal mixer, then adding 0.8 part of DBPMH for reaction for 8min, and obtaining the PLA/SiR blend by heating the internal mixer at 185 ℃ and rotating a rotor at 40 rpm.
Example 14
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight: 100 parts of PLA, 10 parts of SiR-g-GMA (example 2), 10 parts of SiR rubber compound (example 8) and 1 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 3min in the internal mixer, then adding 1 part of DBPMH for reaction for 5min, and obtaining the PLA/SiR blend by heating the internal mixer at 185 ℃ and rotating a rotor at 40 rpm.
Example 15
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight: 100 parts of PLA, 15 parts of SiR-g-GMA (example 3), 10 parts of SiR rubber compound (example 8) and 0.3 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 4min in the internal mixer, then adding 0.3 part of DBPMH for reaction for 6min, and obtaining the PLA/SiR blend by heating the internal mixer at 185 ℃ and rotating a rotor at 40 rpm.
Example 16
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight: 100 parts of PLA, 10 parts of SiR-g-GMA (example 3), 20 parts of SiR rubber compound (example 7) and 0.3 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 5min in the internal mixer, then adding 0.3 part of DBPMH for reaction for 6min, and obtaining the PLA/SiR blend by heating the internal mixer at 185 ℃ and rotating a rotor at 50rpm.
The quench section morphology of example 16 is shown in FIG. 1, compared to a comparative example without SiR-g-GMA and silica addition; the phase interface between PLA and SiR in the PLA/SiR blend after compatibilization is blurred, the size of SiR domain is obviously reduced, and the compatibility is obviously improved.
Example 17
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight:
100 parts of PLA, 15 parts of SiR-g-GMA (example 1), 20 parts of SiR rubber compound (example 6) and 1 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 4min in the internal mixer, then adding 1 part of DBPMH for reaction for 6min, and obtaining the PLA/SiR blend by heating the internal mixer at 190 ℃ and rotating a rotor at 40 rpm.
Example 18
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight: 100 parts of PLA, 5 parts of SiR-g-GMA (example 2), 25 parts of SiR rubber compound (example 7) and 0.3 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 4min in the internal mixer, then adding 0.3 part of DBPMH for reaction for 6min, wherein the heating temperature of the internal mixer is 195 ℃, and the rotating speed of a rotor is 40rpm, so as to obtain the PLA/SiR blend.
Example 19
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight:
100 parts of PLA, 15 parts of SiR-g-GMA (example 2), 25 parts of SiR rubber compound (example 8) and 0.3 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 4min in the internal mixer, then adding 0.3 part of DBPMH for reaction for 6min, and obtaining the PLA/SiR blend by heating the internal mixer at 185 ℃ and rotating a rotor at 40 rpm.
Example 20
Super-tough PLA/SiR blend comprises the following raw materials in parts by weight: 100 parts of PLA, 15 parts of SiR-g-GMA (example 3), 25 parts of SiR rubber compound (example 8) and 0.3 part of vulcanizing agent.
Super-tough PLA/SiR blend is prepared by the following steps:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 4min in the internal mixer, then adding 0.3 part of DBPMH for reaction for 5min, and obtaining the PLA/SiR blend by heating the internal mixer at 190 ℃ and the rotor rotating speed of 50rpm.
Comparative example 1
PLA/SiR blend comprises the following raw materials in parts by weight: 100 parts of PLA (polylactic acid) and 20 parts of SiR (virgin rubber) by mass (without pretreatment), and 0.3 part of vulcanizing agent.
PLA/SiR blend, the preparation process is as follows:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA and SiR into an internal mixer, melting and mixing for 4min in the internal mixer, then adding 0.3 part of DBPMH for reaction for 5min, wherein the heating temperature of the internal mixer is 190 ℃, and the rotating speed of a rotor is 50rpm, so as to obtain the PLA/SiR blend.
Comparative example 2
PLA/SiR blend comprises the following raw materials in parts by weight: 100 parts of PLA, 10 parts of Castor Oil (COP), 20 parts of SiR aggregate colloid (example 7) and 0.3 part of vulcanizing agent.
PLA/SiR/COP blend, the preparation process is as follows:
PLA was dried in a vacuum oven at 70 ℃ for 2h. Adding the dried PLA, COP, siR coagulation glue into an internal mixer, carrying out melt mixing for 4min in the internal mixer, then adding 0.3 part of DBPMH for reaction for 5min, wherein the heating temperature of the internal mixer is 190 ℃, and the rotating speed of a rotor is 50rpm, so as to obtain the PLA/SiR/COP blend.
TABLE 1
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (8)
1. The super-tough PLA/SiR blend is characterized by comprising the following components in parts by weight: PLA:100 parts of SiR rubber compound: 10-25 parts of SiR-g-GMA copolymer: 5-15 parts of vulcanizing agent: 0.1-1.0 parts.
2. The super tough PLA/SiR blend of claim 1, characterized by: the preparation method of SiR-g-GMA comprises the following steps: accurately weighing silicon rubber (SiR) and Glycidyl Methacrylate (GMA), mixing uniformly in advance, adding a vulcanizing agent after blending for 3 minutes, carrying out grafting reaction for 12 minutes, and collecting products to obtain a grafted product SiR-g-GMA of the silicon rubber and the GMA.
3. The super tough PLA/SiR blend of claim 2, characterized by: the SiR-g-GMA is prepared from the following raw materials in parts by mass: 100 parts of silicone rubber, 5-20 parts of GMA and 0.1-1.0 parts of vulcanizing agent.
4. The super tough PLA/SiR blend of claim 2, characterized by: the vulcanizing agent is dicumyl peroxide (DCP); the blending temperature is 160-185 ℃ and the rotating speed is 30-50rpm.
5. The super tough PLA/SiR blend of claim 1, characterized by: the preparation method of the SiR rubber compound comprises the following steps: the internal mixer is opened, the temperature is 70 ℃, the rotating speed is 30-50rpm, and the silicon rubber (SiR) and the gas phase SiO are accurately weighed 2 Sequentially adding gas phase SiO into a beaker by using hydroxyl silicone oil 2 The mass fraction of the hydroxyl silicone oil is gas phase SiO 2 10% of (C) SiO in the gas phase in a high-speed stirrer 2 Mixing with hydroxy silicone oil; after the temperature of the internal mixer reaches 180 ℃, adding silicon rubber SiR, uniformly pouring the mixture into the internal mixer for 8-30min, and collecting the product.
6. The super tough PLA/SiR blend of claim 5, characterized by: the SiR rubber compound is prepared from the following raw materials in parts by mass: 100 parts of silicon rubber SiR and gas phase SiO 2 10-50 parts of hydroxyl silicone oil and 1-5 parts of hydroxyl silicone oil.
7. A method of preparing the super tough PLA/SiR blend of claim 1, characterized by: the preparation method of the PLA/SiR blend comprises the following steps: and (3) drying PLA for 2 hours at 70 ℃ in a vacuum drying oven, adding the dried PLA, siR mixed rubber and SiR-g-GMA polymer into an internal mixer, carrying out melt mixing for 3-5min in the internal mixer, and then adding a vulcanizing agent to react for 5-8min to obtain the PLA/SiR blend.
8. The method of preparing a super tough PLA/SiR blend according to claim 7, wherein: the vulcanizing agent is bis-di-penta (DBPMH) and the dosage of the vulcanizing agent is 0.1-1.0 part; the heating temperature of the internal mixer is 180-195 ℃ and the rotating speed of the rotor is 30-50rpm.
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