CN111849139A - High-strength and high-toughness fully biodegradable material and preparation method thereof - Google Patents
High-strength and high-toughness fully biodegradable material and preparation method thereof Download PDFInfo
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- C08L25/08—Copolymers of styrene
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Abstract
The invention discloses a high-strength and high-toughness fully biodegradable material and a preparation method thereof. The full-biodegradable material comprises matrix polylactic acid (PLA), poly adipic acid/butylene terephthalate (PBAT) and a double-comb compatibilizer; the double-comb compatibilizer is a polymer which takes a linear compatibilization polymer SG as a main chain and takes polylactic acid and polybutylene adipate/terephthalate (PBAT) which are opposite to the polylactic acid of a matrix in a stereoconfiguration as side chains; the polylactic acid with the opposite two structures has intermolecular hydrogen bond action so as to form an interface stereo composite crystal (SC), and the poly adipic acid/butylene terephthalate (PBAT) and a matrix PBAT are subjected to molecular chain entanglement. The material has excellent mechanical strength and excellent toughness, can be directly applied to the fields of food packaging, agricultural films and the like as a master batch, and the preparation method only needs common melting and mixing equipment, so that the industrial preparation is simple.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, relates to a full-biodegradable material with high strength and high toughness and a preparation method thereof, and particularly relates to a method for realizing high performance of a PLA/PBAT incompatible system by combining blending modification and stereo composite crystal of PLA.
Background
Polylactic acid (PLA) is a typical biodegradable polymer material, has characteristics of high mechanical strength, low price, and the like, and is receiving wide attention. However, because of the semi-rigid framework structure of PLA itself, the molecular motion capability of PLA is poor, so that the PLA has three performance defects of poor toughness, slow crystallization speed and low heat-resistant temperature, and the application range of the PLA is greatly limited. In response to these three major performance shortcomings of polylactic acid, a number of studies over the past 20 years have shown that: blending modification is the simplest and most effective way to toughen PLA and improve its heat resistance. However, according to the second law of thermodynamics, most of the components of the PLA-based polymer blending system are not thermodynamically compatible, and the materials can undergo phase separation on a macroscopic scale through simple physical blending, so that high performance is difficult to realize. Therefore, improving the interfacial compatibility of PLA with other components is a core scientific problem of polylactic acid blending research.
Reactive blending strategies have received considerable attention from both academic and industrial circles because of their ability to effectively improve the interfacial compatibility of incompatible blends. The PLA molecule contains terminal carboxyl, so that the PLA molecule has higher reactivity with an epoxy group. Therefore, a reactive compatibilizer is introduced into the blending system or PLA is directly blended with the component containing the epoxy group, and a graft or block copolymer can be generated in situ at the interface in the melt blending process, so that the interfacial tension is effectively reduced, the interphase adhesive force is improved, and the compatibilization effect is achieved. For example, Oyama et al have found that blending PLA with a reactive ethylene-glycidyl methacrylate copolymer (E-GMA) can produce a super tough PLA composite. This is because the (E-GMA) -g-PLLA graft copolymer generated in situ in melt blending helps to enhance the interphase adhesion of PLA-elastomer, so the material can effectively transfer stress from the PLA substrate to the micro-region of the elastic particles under tensile deformation, thereby significantly improving the toughness and impact performance of the blend.
Although the PLA-based blending material can be endowed with excellent mechanical properties through blending modification, the crystallization rate of PLA cannot be improved through simple blending modification, and the crystallinity of polylactic acid in the blend is low, so that the blending material still has the defects of poor heat resistance, no hydrolysis resistance, long forming period and the like.
The invention provides a method for simultaneously realizing compatibilization modification and improving the nucleation rate of PLA on a plurality of PLA-based incompatible blends under the condition of adding a small amount of PDLA. The PLLA/PBAT incompatible blending system is compatibilized by using double-comb compatibilizer molecules with SG as a main chain and PLA and PBAT as side chains, because PDLA and PLLA have opposite stereo structures and intermolecular hydrogen bond action, an interface stereo composite crystal (SC) is formed, and the SC can promote the crystallization rate of matrix PLA to improve the strength, modulus and heat resistance of the material.
Disclosure of Invention
The invention aims to provide a high-strength super-tough fully biodegradable material which has excellent strength modulus and good impact toughness.
The purpose of the invention is realized by the following technical scheme:
a high-strength super-tough full-biodegradable material is a blend, and comprises matrix polylactic acid (PLA), polybutylene adipate/terephthalate (PBAT) and a double-comb compatibilizer; the double-comb compatibilizer is a polymer which takes a linear compatibilization polymer SG as a main chain and takes polylactic acid and polybutylene adipate/terephthalate (PBAT) which are opposite to the polylactic acid of a matrix in a stereoconfiguration as side chains; the polylactic acid with the opposite two structures has intermolecular hydrogen bond action so as to form an interface stereo composite crystal (SC), and the poly adipic acid/butylene terephthalate (PBAT) and a matrix PBAT are subjected to molecular chain entanglement.
The blend comprises the following components in parts by weight: 20-80 parts of matrix polylactic acid, 20-80 parts of PBAT, 0.5-15 parts of polylactic acid which is opposite to the matrix polylactic acid in structure, and 0.5-15 parts of SG.
The PLLA and the PDLA are PLA with opposite structures, are biodegradable materials, have reactive groups at the tail ends, can react with SG under the melting condition, and have the number average molecular weight of 5000-200000;
preferably, the matrix polylactic acid is l-polylactic acid PLLA, and the polylactic acid having a stereoreversed structure to the matrix polylactic acid is d-polylactic acid PDLA.
The PBAT is a biodegradable material, the tail end of the PBAT is provided with a reactive group, the PBAT can react with SG under the melting condition, and the number average molecular weight range of the PBAT is 5000-150000.
The linear compatibilization polymer SG is styrene-glycidyl methacrylate, wherein the SG takes PS as a main chain and contains a large amount of epoxy functional groups with reactivity (the GMA range is 10-60%).
The invention also aims to provide a preparation method of the high-strength and super-tough fully biodegradable material, which comprises the following steps:
step (1), carrying out vacuum drying on a matrix PLA, PLA with a structure opposite to that of the matrix PLA, PBAT and SG at a temperature of 60-80 ℃ for 24-48 h;
step (2), adding the dried SG and PLA with opposite structure to the matrix PLA into a melt mixing device, and carrying out melt mixing at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min until the torque is not increased to obtain a product 1;
and (3) discharging the product 1 from the melt mixing equipment, cooling to normal temperature, physically and uniformly mixing the dried matrixes PLA and PBAT, adding the mixture into the melt mixing equipment, and carrying out melt mixing for 10-15 min at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min to obtain a product 2.
The melting and mixing equipment is an internal mixer, a single-screw extruder or a double-screw extruder.
The product 2 in the step (3) of the preparation method can be directly used as a master batch to be applied to the fields of food packaging, agricultural mulching films, biological medicines and the like.
The invention also aims to provide a compatibilizer for a PLA/PBAT incompatible system, which takes a linear compatibilization polymer SG as a main chain and takes polylactic acid and polybutylene adipate/terephthalate (PBAT) which are opposite to the polylactic acid of a matrix as side chains.
The invention has the beneficial effects that:
1) according to the invention, blending modification and interface stereo composite crystal are innovatively added into a blending system of polylactic acid (PLA) and poly adipic acid/polybutylene terephthalate (PBAT), so that the control of a bicontinuous microstructure of a PLA/PBAT incompatible system can be realized, and a good compatibilization effect is achieved, so that the high toughness of the material is achieved; on the other hand, the interfacial stereo composite crystal formed by reactive blending can effectively promote the nucleation of the matrix PLA, thereby achieving the high modulus and high strength of the material.
2) In PLLA/PBAT, a small amount of PDLA is added to form a stereo composite crystal on a two-phase interface, and the stereo composite crystal promotes nucleation of matrix polylactic acid on the premise that the compatibility of a blend is improved and the size of a phase region is small, so that the material has certain toughness and modulus; however, if the addition amount of the PDLA is too high, a large amount of interface stereo composite crystals can be caused to greatly improve the crystallization rate of the matrix polylactic acid, the crystallinity of the blend is greatly increased, the modulus of the material is obviously improved, and meanwhile, a large part of the toughness of the material is lost. The method for combining the well-dispersed interface stereo composite crystal and the interfacial compatibilization and interfacial nucleation of the PLA incompatible system by adding the PDLA in a small amount has not been reported before; in addition, the addition of the interface stereo composite crystal is ensured to greatly improve the phase interface of the polylactic acid blend, regulate and control the phase morphology, promote the PLA nucleation to improve the strength and toughness of the composite material, and can meet the actual requirements.
3) The invention only needs common melting and mixing equipment, and the industrial preparation is simple.
4) The polylactic acid composite material not only greatly improves the modulus of the blend, but also greatly improves the toughness of the polylactic acid blend, and can be applied to the fields of food packaging, agricultural mulching films, biological medicines and the like.
Drawings
FIG. 1 is a TEM image of comparative example 1(PLLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30)) and example 1(PDLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30), i.e., an interfacial stereocomplex crystal is introduced into an incompatible system), where a, b represent the internal micro-morphology of each sample, respectively, and 1, 2 represent TEM magnification of 2K and 10K, respectively;
FIG. 2 is a differential scanning calorimetry plot of materials prepared in comparative example 1 (PLLA-g-SG-g-PBAT-compatibilized PLLA/PBAT (70/30)) and example 1 (PDLA-g-SG-g-PBAT-compatibilized PLLA/PBAT (70/30), i.e., an interfacial stereocomplex crystal is introduced into an incompatible system) under a nitrogen atmosphere, wherein a is a plot of the temperature decrease of each sample after the thermal history is removed below the melting temperature of the stereocomplex crystal (<220 ℃), and b is a plot of the second temperature increase of each sample;
FIG. 3 is a graph of the rheology of materials prepared in comparative example 1(PLLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30)) and example 1(PDLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30), i.e., interfacial stereocomplex crystals were introduced into the incompatible system) at different test temperatures (200 ℃, 250 ℃) in a nitrogen atmosphere;
FIG. 4 is a graph of tensile data for materials prepared in comparative example 1(PLLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30)) and example 1(PDLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30), i.e., interfacial stereocomplex crystals were introduced into the incompatible system);
FIG. 5 is a graph of impact data for materials prepared in comparative example 1(PLLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30)) and example 1(PDLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30), i.e., interfacial stereocomplex crystals were introduced into the incompatible system).
Detailed Description
The invention is further analyzed with reference to the following figures and specific examples.
The PLLA and PDLA used in the following examples have number average molecular weights of 5000 to 200000, PBAT has number average molecular weight of 5000 to 150000, and SG is styrene-glycidyl methacrylate.
Comparative example 1.
Step (1), drying PLLA, PBAT and SG at 60-80 ℃ for 24-48 h in vacuum;
adding the dried SG and PLLA into melt mixing equipment, and carrying out melt mixing at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min until the torque does not rise to obtain a product 1;
and (3) discharging the product 1 from the melt mixing equipment, cooling to normal temperature, physically and uniformly mixing the product with the dried PLLA and PBAT, adding the mixture into the melt mixing equipment, and carrying out melt mixing for 10-15 min at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min to obtain a product 2.
The mass ratio of PLA/PBAT/SG in the polylactic acid compound prepared in comparative example 1 is 70: 30: 6.
example 1.
Step (1), carrying out vacuum drying on PLLA, PDLA, PBAT and SG at the temperature of 60-80 ℃ for 24-48 h;
adding the dried SG and PDLA into melt mixing equipment, and carrying out melt mixing at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min until the torque does not rise to obtain a product 1;
and (3) discharging the product 1 from the melt mixing equipment, cooling to normal temperature, physically and uniformly mixing the product with the dried PLLA and PBAT, adding the mixture into the melt mixing equipment, and carrying out melt mixing for 10-15 min at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min to obtain a product 2.
The mass ratio of PLLA/PBAT/SG/PDLA in the polylactic acid compound prepared in example 1 is 70: 30: 6: 3.
the samples from comparative example 1 and example 1 were hot-pressed into 0.5mm films and their micro-topography, thermal behavior and mechanical properties were characterized.
As shown in FIG. 1, SEM analysis of example 1(PDLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30), i.e., the interfacial stereocomplex crystal was introduced into the incompatible system) and comparative example 1(PLLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30)) shows that the addition of the interfacial stereocomplex crystal has a large effect on the micro-morphology of the PLA blend. The interfacial tension is reduced, the appearance is also changed from an island structure to a bicontinuous structure, and the formed interfacial stereo composite crystal (SC) has higher modulus, which is equivalent to providing a rigid interfacial layer. This also explains the more flat interface obtained in the SEM image of example 1. The special structure of the mutual connection of the PBAT disperse phases is more beneficial to the internal transmission of external stress, which explains the improvement of the toughness.
As shown in FIG. 2, Differential Scanning Calorimetry (DSC) analysis was performed on example 1(PDLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30), i.e., introducing interfacial stereocomplex crystals in the incompatible system) and comparative example 1(PLLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30)). We can see that the crystallization peak of PLA around 120 ℃ becomes more obvious in the cooling curve of example 1 in (a), which indicates that the addition of the interfacial stereo-composite crystal improves the crystallization rate of PLA; meanwhile, in the temperature rising curve of the embodiment 1 in the (b), the cold crystallization peak of the PLA at about 110 ℃ is obviously weakened, which shows that the crystallization degree of the embodiment 1 is more perfect, and the nucleation promoting effect of the interface stereo composite crystal on the PLA is also confirmed. This explains the high modulus, high strength of PLA blends in the following.
As shown in FIG. 3, example 1 the rheological behavior analysis at different test temperatures (200 ℃ C., 250 ℃ C.) was performed on example 1(PDLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30), i.e., introducing interfacial stereocomplex crystals into the incompatible system) and comparative example 1(PLLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30)). We can see that example 1 has a higher modulus than comparative example 1 at the 200 ℃ rheology test temperature. This indicates that the addition of the interfacial stereocomplex crystal can improve the modulus of the PLLA/PBAT blend to a certain extent; and for the sample prepared in example 1, two different rheological temperature tests of 200 ℃ and 250 ℃ are respectively carried out, and we can see that the modulus of the PLA/PBAT blend is reduced along with the melting of the interface stereo complex crystal under 250 ℃ (higher than the interface stereo complex crystal ≈ 220 ℃). This confirms that the high modulus and strength of the PLA/PBAT composite material are closely related to the interfacial stereo composite crystal formed by the in-situ reaction.
As shown in FIG. 4, example 1 (PDLA-g-SG-g-PBAT-compatibilized PLLA/PBAT (70/30), i.e., the introduction of interfacial stereocomplex crystals in the incompatible system) and comparative example 1 (PLLA-g-SG-g-PBAT-compatibilized PLLA/PBAT (70/30)) were subjected to tensile property analysis. We can see that both comparative example 1 and example 1 have better elongation at break, which is closely related to the phase region morphology of nanometer size in SEM picture. Except that example 1 has higher yield and fracture strength, which is mainly due to the nucleation of the interfacial stereo composite crystals on the matrix PLA.
As shown in FIG. 5, example 1(PDLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30), an incompatible systemIn which interfacial stereocomplex crystals were introduced) and comparative example 1(PLLA-g-SG-g-PBAT compatibilized PLLA/PBAT (70/30)). We can see that the impact strength of comparative example 1 is only about 8.4KJ/m2In the example 1, the interface stereo composite crystal is introduced, so that the micro-morphology of the system is changed. The continuous structure of the PBAT disperse phase is more beneficial to the internal transfer of external stress, so the impact strength is obviously improved to 53.0KJ/m2Therefore, the super-tough PLA-based biodegradable material is obtained.
Table 1 is a detailed data analysis of the mechanical properties of example 1 and comparative example 1:
example 2.
Step (1), carrying out vacuum drying on PLLA, PDLA, PBAT and SG at the temperature of 60-80 ℃ for 24-48 h;
adding the dried SG and PDLA into melt mixing equipment, and carrying out melt mixing at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min until the torque does not rise to obtain a product 1;
and (3) discharging the product 1 from the melt mixing equipment, cooling to normal temperature, physically and uniformly mixing the product with the dried PLLA and PBAT, adding the mixture into the melt mixing equipment, and carrying out melt mixing for 10-15 min at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min to obtain a product 2.
The mass ratio of PLLA/PBAT/SG/PDLA in the polylactic acid compound prepared in example 2 is 70: 30: 6: 6.
example 3.
Step (1), carrying out vacuum drying on PLLA, PDLA, PBAT and SG at the temperature of 60-80 ℃ for 24-48 h;
adding the dried SG and PDLA into melt mixing equipment, and carrying out melt mixing at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min until the torque does not rise to obtain a product 1;
and (3) discharging the product 1 from the melt mixing equipment, cooling to normal temperature, physically and uniformly mixing the product with the dried PLLA and PBAT, adding the mixture into the melt mixing equipment, and carrying out melt mixing for 10-15 min at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min to obtain a product 2.
The mass ratio of PLLA/PBAT/SG/PDLA in the polylactic acid compound prepared in example 3 is 70: 30: 6: 9.
example 4.
Step (1), carrying out vacuum drying on PLLA, PDLA, PBAT and SG at the temperature of 60-80 ℃ for 24-48 h;
adding the dried SG and PDLA into melt mixing equipment, and carrying out melt mixing at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min until the torque does not rise to obtain a product 1;
and (3) discharging the product 1 from the melt mixing equipment, cooling to normal temperature, physically and uniformly mixing the product with the dried PLLA and PBAT, adding the mixture into the melt mixing equipment, and carrying out melt mixing for 10-15 min at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min to obtain a product 2.
The mass ratio of PLLA/PBAT/SG/PDLA in the polylactic acid compound prepared in example 4 is 60: 40: 6: 3.
example 5.
Step (1), carrying out vacuum drying on PLLA, PDLA, PBAT and SG at the temperature of 60-80 ℃ for 24-48 h;
adding the dried SG and PDLA into melt mixing equipment, and carrying out melt mixing at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min until the torque does not rise to obtain a product 1;
and (3) discharging the product 1 from the melt mixing equipment, cooling to normal temperature, physically and uniformly mixing the product with the dried PLLA and PBAT, adding the mixture into the melt mixing equipment, and carrying out melt mixing for 10-15 min at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min to obtain a product 2.
The mass ratio of PLLA/PBAT/SG/PDLA in the polylactic acid compound prepared in example 5 is 80: 20: 6: 3.
example 6.
Step (1), carrying out vacuum drying on PLLA, PDLA, PBAT and SG at the temperature of 60-80 ℃ for 24-48 h;
adding the dried SG and PDLA into melt mixing equipment, and carrying out melt mixing at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min until the torque does not rise to obtain a product 1;
and (3) discharging the product 1 from the melt mixing equipment, cooling to normal temperature, physically and uniformly mixing the product with the dried PLLA and PBAT, adding the mixture into the melt mixing equipment, and carrying out melt mixing for 10-15 min at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min to obtain a product 2.
The mass ratio of PLLA/PBAT/SG/PDLA in the polylactic acid compound prepared in example 6 is 20: 80: 0.5: 0.5.
example 7.
Step (1), carrying out vacuum drying on PLLA, PDLA, PBAT and SG at the temperature of 60-80 ℃ for 24-48 h;
adding the dried SG and PDLA into melt mixing equipment, and carrying out melt mixing at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min until the torque does not rise to obtain a product 1;
and (3) discharging the product 1 from the melt mixing equipment, cooling to normal temperature, physically and uniformly mixing the product with the dried PLLA and PBAT, adding the mixture into the melt mixing equipment, and carrying out melt mixing for 10-15 min at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min to obtain a product 2.
The mass ratio of PLLA/PBAT/SG/PDLA in the polylactic acid compound prepared in example 7 is 70: 30: 15: 15.
the above embodiments are not intended to limit the present invention, and the present invention is not limited to the above embodiments, and all embodiments are within the scope of the present invention as long as the requirements of the present invention are met.
Claims (9)
1. A full-biodegradable material with high strength and high toughness is a blend and is characterized by comprising a matrix polylactic acid (PLA), a polybutylene adipate terephthalate (PBAT) and a double-comb compatibilizer; the double-comb compatibilizer is a polymer which takes a linear compatibilization polymer SG as a main chain and takes polylactic acid and polybutylene adipate/terephthalate (PBAT) which are opposite to the polylactic acid of a matrix in a stereoconfiguration as side chains; the polylactic acid with the opposite two structures has intermolecular hydrogen bond action so as to form an interface stereo composite crystal (SC), and the poly adipic acid/butylene terephthalate (PBAT) and a matrix PBAT are subjected to molecular chain entanglement.
2. The fully biodegradable material with high strength and high toughness according to claim 1, wherein the weight parts of the components are as follows: 20-80 parts of matrix polylactic acid, 20-80 parts of PBAT, 0.5-15 parts of polylactic acid which is opposite to the matrix polylactic acid in structure, and 0.5-15 parts of SG.
3. A high strength and high toughness completely biodegradable material according to any one of claims 1-2, characterized in that the number average molecular weight of polylactic acid is in the range of 5000 to 200000.
4. A high strength and high toughness completely biodegradable material according to any one of claims 1 to 3, wherein the matrix polylactic acid is L-polylactic acid PLLA and the polylactic acid which is opposite in structure to the matrix polylactic acid is D-polylactic acid PDLA.
5. A high strength and high toughness completely biodegradable material according to any one of claims 1 to 4, characterized in that the linear compatibilized polymer SG is styrene-glycidyl methacrylate.
6. A high strength and high toughness fully biodegradable material according to any one of claims 1-5, characterized in that the number average molecular weight of poly (butylene adipate terephthalate) (PBAT) ranges from 5000 to 150000.
7. A preparation method of a full-biodegradable material with high strength and high toughness is characterized by comprising the following steps:
step (1), carrying out vacuum drying on a matrix PLA, PLA with a structure opposite to that of the matrix PLA, PBAT and SG at a temperature of 60-80 ℃ for 24-48 h;
step (2), adding the dried SG and PLA with opposite structure to the matrix PLA into a melt mixing device, and carrying out melt mixing at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min until the torque is not increased to obtain a product 1;
and (3) discharging the product 1 from the melt mixing equipment, cooling to normal temperature, physically and uniformly mixing the product with the dried matrixes PLA and PBAT, adding the mixture into the melt mixing equipment, and carrying out melt mixing for 10-15 min at the mixing temperature of 180-210 ℃ and the rotor speed of 50-100 rpm/min.
8. The method for preparing a high strength and high toughness fully biodegradable material according to claim 7, wherein said melt-kneading equipment is an internal mixer and a single or twin screw extruder.
9. The compatibilizer for the PLA/PBAT incompatible system is characterized by taking a linear compatibilization polymer SG as a main chain and taking polylactic acid and polybutylene adipate/terephthalate (PBAT) which are opposite to the polylactic acid of a matrix in a steric mode as side chains.
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