CN113801350A - Calcium carbonate filled PBAT/PLA biodegradable plastic film and preparation method thereof - Google Patents
Calcium carbonate filled PBAT/PLA biodegradable plastic film and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of high polymer materials, and particularly relates to a calcium carbonate filled PBAT/PLA biodegradable plastic film. The preparation method comprises the following steps: firstly, chemically modifying polylactic acid by glycidyl methacrylate and cumyl peroxide to prepare a compatibilizer A; and then melting, blending and granulating the poly (terephthalic acid) -adipate-butylene glycol ester, the polylactic acid, the calcium carbonate micro powder, the compatibilizer A and the auxiliary agent, and finally blowing a film to obtain the calcium carbonate filled PBAT/PLA biodegradable plastic film. The plastic film prepared by the invention has good mechanical properties through practical verification, has the transverse tensile strength of 15.3-20.2MPa, the transverse elongation at break of 497.1-614.2%, the longitudinal tensile strength of 20.4-24.4MPa, the longitudinal elongation at break of 390.4-460.7% and the heat sealing strength of 22.8-24.7N/15mm, and can be widely applied to various fields of shopping bags, garbage bags, food packaging, disposable packaging materials and the like.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a calcium carbonate filled PBAT/PLA biodegradable plastic film.
Background
With the advancement of technology and the increase of global population, plastic materials become one of the most widely used materials in life and industry, and the environmental pollution and the exhaustion of non-renewable natural resources caused by the large amount of plastic used are attracting public attention. Not only bring increasing solid waste, destroy environment and biological safety, but also greatly consume petroleum resources. Therefore, the replacement of petroleum-based plastics with bio-based and biodegradable polymers (bioplastics) is seen as an important transformation, thereby reducing the utilization of fossil fuels and the pressure on landfills.
Biodegradable plastics refer to plastic materials that can be completely decomposed into low molecular compounds by the action of microorganisms in nature, such as bacteria, fungi, and algae. Compared with the traditional non-degradable plastics, the biodegradable plastics have the advantages that: 1. the compost can be treated, and the natural environment is not harmed; 2. the volume of the garbage can be reduced through natural degradation, the service time of a garbage landfill is prolonged, and the garbage treatment cost is reduced; 3. the problem that the traditional non-degradable plastics need to be burnt is solved, and the emission of harmful gas is avoided.
CN 111944287A discloses a preparation method of a high-transparency easily-torn polylactic acid blown film, which comprises, by mass, 80-95 parts of polylactic acid, 4-19 parts of poly (terephthalic acid) -butanediol adipate, 0.1-5 parts of a plasticizer, 0.1-1 part of a lubricant, 0.1-1 part of a shedding agent and 0.1-0.5 part of a nucleating agent, wherein the polylactic acid, the polybutylene terephthalate-butanediol adipate, the plasticizer, the nucleating agent and the nucleating agent are blended and granulated by a double-screw extruder, and the mixture is cooled by a blowing method under a film blowing machine to prepare the biodegradable plastic film with higher transparency, and the biodegradable plastic film is used for replacing the traditional PE, PP and other films.
Palsikowski et al, in J Polymer Environ (2018, 26 (1): 330-341), found that the melt-prepared PLA/PBAT blends with different proportions have improved crystallinity and reduced degradation rate; when a compatilizer is added into the blending system, the biodegradation process is more complicated. Meanwhile, in order to improve the compatibility of PLA/PBAT, a compatibilizer or other polymers needs to be added into a blending system, so that the complexity of a biodegradation process is further improved.
CN 111793332A provides a preparation method of a biodegradable film material, which comprises, by weight, 60-90 parts of PBAT, 3-8 parts of PLA/PBS5-15 parts of modified starch, 10-30 parts of modified biological calcium powder, 2-10 parts of EAA, 0.1-1 part of a dispersant, 0.1-1 part of a chain extender, 0.1-1 part of erucamide, 0.1-1 part of a surfactant and 1-5 parts of glycerol/silicone oil.
Although the biodegradable film material is prepared by the method, the process is complex, the energy consumption is high, the mechanical capacity of the film material is weak, and the film material is easy to crack when bearing larger pressure, so that the application range of the film material is limited.
Disclosure of Invention
The invention aims to provide a calcium carbonate filled PBAT/PLA biodegradable plastic film, which is prepared by chemically modifying polylactic acid by glycidyl methacrylate and cumyl peroxide to obtain a compatibilizer A; and then melting and blending the poly (terephthalic acid) -butanediol adipate, the polylactic acid, the calcium carbonate micro powder, the compatibilizer A and the auxiliary agent, and finally blowing a film to obtain the calcium carbonate filled PBAT/PLA biodegradable plastic film.
The polylactic acid (PLA) is a green biodegradable material with good degradation capability, and is a degradable polymer derived from renewable resources such as plant starch or saccharides. The starch raw material is saccharified to obtain glucose, the glucose and certain strains are fermented to prepare high-purity lactic acid, and the polylactic acid with certain molecular weight is synthesized by a chemical synthesis method. But the toughness of PLA is low when the PLA is used alone, and the application of the PLA product is greatly restricted. In addition, when polylactic acid (PLA) is compounded with other high polymer materials, the compatibility of the PLA is poor, so that the mechanical property of the biodegradable composite material is reduced, and the daily application is not facilitated.
Therefore, polylactic acid (PLA) is modified by Glycidyl Methacrylate (GMA) and cumyl peroxide (DCP), and the polylactic acid is mixed uniformly at normal temperature, extruded and granulated to prepare the compatibilizer A so as to enhance the interface compatibility. GMA is a bifunctional monomer, contains epoxy groups and double bonds, can perform graft polymerization with PLA under the initiation of DCP to generate epoxy-group PLA, wherein the epoxy groups can not only enhance the interface compatibility of PBAT and PLA, but also can react with degradation products of PBAT or PLA in the processing process to play a role of a chain extender. The invention discovers that the using amount of GMA is too low, the grafting rate of the GMA and PLA reaction is low, the compatibilization effect is poor, and the self-polymerization reaction is easy to occur and the grafting reaction is not facilitated if the using amount of the GMA is too high, so that the experimental result shows that the result is better when the using amount of the GMA is 10-30 parts; similarly, when the DCP is used as an initiator, the initiation efficiency is low when the content is too low, the grafting rate is low, and excessive spark free radicals are generated when the content is too high, so that the self-polymerization reaction of the GMA is easily caused, the grafting reaction is not facilitated, and the experimental result shows that the effect is better when the dosage of the DCP is 0.5-1 part.
The prepared compatibilizer A can effectively improve the compatibility of poly (terephthalic acid-butylene adipate-terephthalate) (PBAT) and polylactic acid (PLA), calcium carbonate micro powder is used for filling a high-molecular compound, and finally, the commercial product can be prepared by simply blowing a film.
The calcium carbonate micropowder is cheap, the cost of a final product can be reduced, the calcium carbonate micropowder can be used as a reinforcing agent to enhance the mechanical strength of the blend to a certain degree, and in addition, the nanoscale calcium carbonate can be used as a nucleating agent in the modification process, so that the crystallization of PBAT and PLA is facilitated, and the mechanical property of the blend is further enhanced.
In a preferred embodiment, the chemical modification step of polylactic acid comprises the following raw materials in parts by weight: 10-30 parts of glycidyl methacrylate, 0.5-1 part of cumyl peroxide and 70-90 parts of polylactic acid, preferably 16-27 parts of glycidyl methacrylate, 0.6-0.8 part of cumyl peroxide and 73-84 parts of polylactic acid, and has better compatibilization effect.
In a preferred embodiment, the polylactic acid is selected from one or more of dextrorotatory polylactic acid (PDLA), levorotatory polylactic acid (PLLA) and racemic polylactic acid (PDLLA), the optical purity is 80-100%, and the weight-average molecular weight is 2000-30000.
In a preferred embodiment, the polybutylene terephthalate-adipate-butanediol ester is a film blowing grade raw material, the density is 1.18-1.3g/ml, the melt index is 3-5g/10min (the test temperature is 190 ℃, and the nominal load is 2.16kg), and researches show that the PBAT and the compatibilizer under the condition are better combined, so that the stability of the composite material can be enhanced, and the mechanical property of the material can be further enhanced;
in a preferred embodiment, the calcium carbonate micropowder has a particle size range selected from the group consisting of micron-sized, nano-sized, or mixtures thereof, preferably, nano-sized calcium carbonate; the nano calcium carbonate can play a role of a nucleating agent, is beneficial to crystallization of PBAT and PLA, and further enhances the mechanical property of the product.
In a preferred embodiment, the auxiliaries include coupling agents, plasticizers, lubricants, antioxidants, light stabilizers and chain extenders.
In a preferred embodiment, the melt blending step comprises the following raw materials in parts by weight: 50-70 parts of poly (terephthalic acid) -butanediol adipate, 0-30 parts of polylactic acid, 0-40 parts of calcium carbonate micro powder, 0-10 parts of compatibilizer A, 0.5-1 parts of coupling agent, 0.5-2 parts of plasticizer, 0.1-1 parts of lubricant, 0.1-1 parts of antioxidant, 0.1-1 parts of light stabilizer and 0-0.5 parts of chain extender;
preferably, 53-68 parts of polybutylene terephthalate-adipate, 10-25 parts of polylactic acid, 10-35 parts of calcium carbonate micropowder, 5-10 parts of compatibilizer A, 0.5-1 part of coupling agent, 0.8-1.5 parts of plasticizer, 0.5-0.8 part of lubricant, 0.3-0.8 part of antioxidant, 0.5-0.8 part of light stabilizer and 0.1-0.4 part of chain extender.
In a preferred embodiment, the coupling agent is selected from one or more of aluminate coupling agents and titanate coupling agents;
the plasticizer is selected from one or more of acetyl tributyl citrate (ATBC), polyethylene glycol 400(PEG400), glycerol, tetraoctyl pyromellitate and epoxidized soybean oil;
the lubricant is selected from one or more of Ethylene Bis Stearamide (EBS), erucamide, stearic acid, zinc stearate, calcium stearate and polyethylene wax;
the antioxidant is selected from one or more of antioxidant 264, antioxidant 1010 and antioxidant 168;
the light stabilizer is one or more of 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2-hydroxy-4-methoxybenzophenone and 2-hydroxy-4-octoxybenzophenone;
the chain extender is one or two of a BASF chain extender ADR4400 and ADR 4468.
The invention also aims to provide a preparation method of the calcium carbonate filled PBAT/PLA biodegradable plastic film, which only comprises the steps of uniformly mixing, extruding and blowing the film, wherein the uniformly mixing is performed at normal temperature, so that the energy consumption is reduced, the lower operation temperature is also used for extruding and blowing the film, the energy is saved, the emission is reduced, and the cost is reduced.
In order to realize the aim, the invention provides a preparation method of a calcium carbonate filled PBAT/PLA biodegradable plastic film, which comprises the following steps:
s1, polylactic acid chemical modification, namely drying polylactic acid, glycidyl methacrylate and cumene peroxide until the water content is lower than 0.5%, weighing the materials in proportion, stirring at normal temperature, uniformly mixing, performing melt extrusion by a double-screw extruder, bracing, air cooling, granulating and drying to obtain a compatibilizer A;
s2, preparing a calcium carbonate filled PBAT/PLA composite material: weighing the poly (terephthalic acid) -butanediol adipate, the polylactic acid, the calcium carbonate micro powder, the auxiliary agent and the compatibilizer A prepared in the step S1 according to a proportion, stirring and uniformly mixing at normal temperature, performing melt extrusion granulation by a double-screw extruder, and drying to obtain the calcium carbonate filled PBAT/PLA composite material;
s3, film blowing: and (5) putting the composite material prepared in the step S2 into a single-screw film blowing machine, blowing to form a film, and obtaining the calcium carbonate filled PBAT/PLA biodegradable plastic film at the extruder temperature of 140 ℃ and 170 ℃.
In a preferred embodiment, in the steps S1 and S2, the melt extrusion conditions are: length-diameter ratio of the twin-screw extruder 52: 1, the temperature of the extruder is 110-140 ℃, the screw rotation speed is 100-.
In a preferred embodiment, in step S1, the room temperature stirring conditions are: stirring for 5min at the rotating speed of 300-;
in the step S2, the normal temperature stirring conditions are: the mixture was stirred for 15min at 300-.
In addition, in the step of chemically modifying the polylactic acid, any common melt processing technology can be adopted, including but not limited to twin-screw extruder blending or internal mixer melt blending, as long as the blending effect can be achieved.
Compared with the prior art, the calcium carbonate filled PBAT/PLA biodegradable plastic film and the preparation method thereof have the following advantages:
1. in the scheme of the invention, PLA is subjected to melt modification by Glycidyl Methacrylate (GMA) and cumene peroxide (DCP) to prepare the compatibilizer, the method is simple, the cost is low, and the compatibility of a high polymer material can be obviously improved, so that the mechanical property of the composite material is improved.
2. The composite material is filled with the calcium carbonate micro powder, so that the cost is low, the raw materials are easy to obtain, the compatibility with the copolymer is good, the strength of the composite material is effectively improved, the quality of the blown film is higher, and the quality is firm and stable.
3. The preparation method has the advantages of simple preparation process, low energy consumption, short operation time and low technical requirement on workers, is particularly suitable for large-scale industrial production and preparation, and can realize large-batch continuous production.
4. The plastic film prepared by the invention has good mechanical properties through practical verification, has the transverse tensile strength of 15.3-20.2MPa, the transverse elongation at break of 497.1-614.2%, the longitudinal tensile strength of 20.4-24.4MPa, the longitudinal elongation at break of 390.4-460.7% and the heat sealing strength of 22.8-24.7N/15mm, can be widely applied to various fields of shopping bags, garbage bags, food packaging, disposable packaging materials and the like, and even can be applied to the technical fields of waterproof materials with high requirements on strength and the like.
5. Because the compatibilizer PLA-g-GMA is prepared firstly, the PLA on the PLA-g-GMA can be compatible with the PLA in the modification process of the PBAT/PLA, and the epoxy group on the GMA can enhance the interface compatibility between the PBAT and the PLA and enhance the effect. While the direct mixing of DCP, GMA, PLA and PBAT cannot achieve the effect of improving the interface compatibility.
Drawings
FIG. 1 is a process flow diagram according to the present invention.
Detailed Description
Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the raw materials used are commercially available.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In the present invention, the parts by weight may be in the units of μ g, mg, g, kg, etc. known in the art, or may be multiples thereof, such as 1/10, 1/100, 10, 100, etc.
Example 1
A calcium carbonate powder filled PBAT/PLA biodegradable plastic film comprises the following components in parts by weight:
the dosage formula of the compatibilizer A is as follows: 75 parts of polylactic acid, 25 parts of glycidyl methacrylate and 0.6 part of cumyl peroxide;
60 parts of PBAT, 20 parts of PLA, 30 parts of calcium carbonate with the wavelength of 40nm, 1 part of aluminate coupling agent, 10 parts of compatibilizer A, 1 part of PEG 4001 part, 0.6 part of erucamide, 10100.6 parts of antioxidant, 0.5 part of 2- (2-hydroxy-5-methylphenyl) benzotriazole and 44680.1 parts of ADR.
The preparation method comprises the following steps:
s1, polylactic acid chemical modification, namely drying polylactic acid (the water content is lower than 0.1%), glycidyl methacrylate and cumene peroxide, weighing the materials in proportion, stirring the materials for 5min at the normal temperature by using a high-speed stirrer at the rotating speed of 50rpm, uniformly mixing the materials, performing melt extrusion by using a double-screw extruder, stretching the materials into strips, performing air cooling and granulation, and drying the strips to obtain a compatibilizer A;
s2, preparing a calcium carbonate filled PBAT/PLA composite material: weighing the poly (terephthalic acid) -butanediol adipate, the polylactic acid, the calcium carbonate micro powder, other additives and the compatibilizer A prepared in the step S1 in proportion, stirring for 15min at a rotating speed of 300rpm by using a high-speed stirrer at normal temperature, performing melt extrusion, bracing, air cooling and granulation by using a double-screw extruder, and drying to obtain the calcium carbonate filled PBAT/PLA composite material;
s3, film blowing: and (5) putting the composite material prepared in the step S2 into a single-screw film blowing machine, blowing to form a film, and obtaining the calcium carbonate filled PBAT/PLA biodegradable plastic film at the extruder temperature of 140 ℃ and 170 ℃.
In steps S1 and S2, the temperature of the twin-screw extruder is 110-.
Example 2
A calcium carbonate powder filled PBAT/PLA biodegradable plastic film comprises the following components in parts by weight:
the dosage formula of the compatibilizer A is as follows: 80 parts of polylactic acid, 20 parts of glycidyl methacrylate and 1 part of cumyl peroxide;
55 parts of PBAT, 15 parts of PLA, 30 parts of calcium carbonate with the wavelength of 80nm, 0.7 part of aluminate coupling agent, 5 parts of compatibilizer A, 1 part of PEG 4001, 0.5 part of erucamide, 10100.5 parts of antioxidant, 0.4 part of 2- (2-hydroxy-5-methylphenyl) benzotriazole and 44680.3 parts of ADR.
The preparation method comprises the following steps:
in steps S1 and S2, the temperature of the twin-screw extruder is 110-.
The rest of the procedure was the same as in example 1.
Example 3
A calcium carbonate powder filled PBAT/PLA biodegradable plastic film comprises the following components in parts by weight:
the dosage formula of the compatibilizer A is as follows: 80 parts of polylactic acid, 20 parts of glycidyl methacrylate and 1 part of cumyl peroxide;
50 parts of PBAT, 10 parts of PLA, 5 mu m 25 parts of calcium carbonate, 0.5 part of aluminate coupling agent, 10 parts of compatibilizer A, 1 part of PEG 4001 part, 0.5 part of erucamide, 10100.5 parts of antioxidant, 0.4 part of 2- (2-hydroxy-5-methylphenyl) benzotriazole and 44680.1 parts of ADR.
The preparation method comprises the following steps:
in steps S1 and S2, the temperature of the twin-screw extruder is 110-.
The rest of the procedure was the same as in example 1.
Example 4
The dosage formula of the compatibilizer A is as follows: 75 parts of polylactic acid, 25 parts of glycidyl methacrylate and 1 part of cumyl peroxide;
70 parts of PBAT, 20 parts of PLA, 10 parts of calcium carbonate with the particle size of 40nm, 0.5 part of aluminate coupling agent, 10 parts of compatibilizer A, 1 part of ATBC, 0.5 part of erucamide, 10100.5 parts of antioxidant, 0.4 part of 2- (2-hydroxy-5-methylphenyl) benzotriazole and 44680.3 parts of ADR.
The procedure was as in example 1.
Example 5
The dosage formula of the compatibilizer A is as follows: 80 parts of polylactic acid, 20 parts of glycidyl methacrylate and 1 part of cumyl peroxide;
50 parts of PBAT, 25 parts of PLA, 5 parts of calcium carbonate with the particle size of 40nm, 5 mu m20 parts of calcium carbonate, 0.5 part of aluminate coupling agent, 10 parts of compatibilizer A, 1 part of ATBC, 0.5 part of erucamide, 10100.5 parts of antioxidant, 0.5 part of 2- (2-hydroxy-5-methylphenyl) benzotriazole and 44680.3 parts of ADR.
The procedure was as in example 1.
Comparative example 1
The paint comprises the following components in parts by weight:
60 parts of PBAT, 20 parts of PLA, 40 parts of calcium carbonate with the wavelength of 40nm, 1 part of aluminate coupling agent, 1 part of PEG 4001, 0.6 part of erucamide, 10100.6 parts of antioxidant, 0.5 part of 2- (2-hydroxy-5-methylphenyl) benzotriazole and 44680.1 parts of ADR.
The preparation method comprises the following steps:
s1, weighing the poly (terephthalic acid) -butylene adipate, the polylactic acid, the calcium carbonate micro powder and other auxiliary agents according to a proportion, stirring for 15min at a rotating speed of 300rpm by using a high-speed stirrer at normal temperature, performing melt extrusion, bracing, air cooling, granulation and drying by using a double-screw extruder to obtain a calcium carbonate filled PBAT/PLA composite material; the temperature of the double-screw extruder is 110-;
s2, putting the composite material into a single-screw film blowing machine, blowing to form a film, and obtaining the calcium carbonate filled PBAT/PLA biodegradable plastic film without the compatibilizer A at the extruder temperature of 140-.
Comparative example 2
The paint comprises the following components in parts by weight:
55 parts of PBAT, 15 parts of PLA, 30 parts of calcium carbonate with the wavelength of 80nm, 0.7 part of aluminate coupling agent, 1 part of PEG 4001, 0.5 part of erucamide, 10100.5 parts of antioxidant, 0.4 part of 2- (2-hydroxy-5-methylphenyl) benzotriazole and 44680.3 parts of ADR.
The preparation method comprises the following steps:
s1, weighing the poly (terephthalic acid) -butylene adipate, the polylactic acid, the calcium carbonate micro powder and other auxiliary agents according to a proportion, stirring for 15min at a rotating speed of 300rpm by using a high-speed stirrer at normal temperature, performing melt extrusion, bracing, air cooling, granulation and drying by using a double-screw extruder to obtain a calcium carbonate filled PBAT/PLA composite material; the temperature of the double-screw extruder is 110-;
s2, putting the composite material into a single-screw film blowing machine, blowing to form a film, and obtaining the calcium carbonate filled PBAT/PLA biodegradable plastic film without the compatibilizer A at the extruder temperature of 140-.
Examples of effects
The tensile properties of the materials were measured in accordance with GB/T1040-2006, and GB/T12026-2000 was used to test the heat-seal strength of the materials, and the biodegradable plastic films prepared according to test examples 1-3 and comparative examples 1-2 were as shown in Table 1:
TABLE 1
From example 1 and comparative example 1, and example 2 and comparative example 2, the tensile strength and elongation at break are significantly reduced and the heat seal strength is also reduced because the compatibilizer a prepared by modifying PLA with glycidyl methacrylate and cumene peroxide is not added, which indicates that the mechanical properties are reduced without adding the compatibilizer a and is not suitable for application scenes under high pressure. Examples 3-5 different tensile properties and heat seal strengths can be emphasized by varying the amounts of PBAT, PLA, calcium carbonate particles and compatibilizer a, as well as the particle size of the sodium carbonate particles. The formula, the dosage and the product prepared by the experimental method have stable mechanical effect.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (9)
1. A calcium carbonate filled PBAT/PLA biodegradable plastic film is characterized in that polylactic acid is chemically modified by glycidyl methacrylate and cumyl peroxide to prepare a compatibilizer A;
then melting, blending and granulating the poly terephthalic acid-adipate-butylene glycol ester, the polylactic acid, the calcium carbonate micro powder, the compatibilizer A and the auxiliary agent, and finally blowing a film to obtain the calcium carbonate filled PBAT/PLA biodegradable plastic film;
the polylactic acid is selected from one or more of PLLA, PDLA and PDLLA, the optical purity is 80-100%, and the weight average molecular weight is 2000-30000;
the poly terephthalic acid-adipic acid-butanediol ester selects a film blowing grade raw material, the density is 1.18-1.3g/ml, and the melt index is 3-5g/10min (190 ℃/2.16 kg).
2. The calcium carbonate filled PBAT/PLA biodegradable plastic film according to claim 1, wherein the chemical modification step of the polylactic acid comprises the following raw materials in parts by weight: 10-30 parts of glycidyl methacrylate, 0.5-1 part of cumyl peroxide and 70-90 parts of polylactic acid.
3. The calcium carbonate-filled PBAT/PLA biodegradable plastic film of claim 1, wherein the calcium carbonate micropowder has a particle size range selected from the group consisting of micron-sized, nano-sized, or a mixture thereof.
4. The calcium carbonate-filled PBAT/PLA biodegradable plastic film of claim 1, wherein the adjuvants comprise coupling agents, plasticizers, lubricants, antioxidants, light stabilizers, and chain extenders.
5. The calcium carbonate-filled PBAT/PLA biodegradable plastic film according to claim 4, wherein in the melt blending step, the calcium carbonate-filled PBAT/PLA biodegradable plastic film consists of the following raw materials in parts by weight: 50-70 parts of poly (terephthalic acid) -butanediol adipate, 0-30 parts of polylactic acid, 0-40 parts of calcium carbonate micro powder, 0-10 parts of compatibilizer A, 0.5-1 part of coupling agent, 0.5-2 parts of plasticizer, 0.1-1 part of lubricant, 0.1-1 part of antioxidant, 0.1-1 part of light stabilizer and 0-0.5 part of chain extender.
6. The calcium carbonate filled PBAT/PLA biodegradable plastic film as claimed in claim 5, wherein the coupling agent is selected from one or more of aluminate coupling agents and titanate coupling agents;
the plasticizer is selected from one or more of acetyl tributyl citrate (ATBC), polyethylene glycol 400(PEG400), glycerol, tetraoctyl pyromellitate and epoxidized soybean oil;
the lubricant is selected from one or more of Ethylene Bis Stearamide (EBS), erucamide, stearic acid, zinc stearate, calcium stearate and polyethylene wax;
the antioxidant is selected from one or more of antioxidant 264, antioxidant 1010 and antioxidant 168;
the light stabilizer is one or more of 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2-hydroxy-4-methoxybenzophenone and 2-hydroxy-4-octoxybenzophenone;
the chain extender is one or two of a BASF chain extender ADR4400 and ADR 4468.
7. The method for preparing the calcium carbonate filled PBAT/PLA biodegradable plastic film as claimed in any one of the claims 1 to 6, which is characterized by comprising the following steps:
s1, polylactic acid chemical modification, namely drying polylactic acid, glycidyl methacrylate and cumene peroxide until the water content is lower than 0.5%, weighing the materials in proportion, stirring at normal temperature, uniformly mixing, performing melt extrusion by a double-screw extruder, bracing, air cooling, granulating and drying to obtain a compatibilizer A;
s2, preparing a calcium carbonate filled PBAT/PLA composite material: weighing the poly (terephthalic acid) -butanediol adipate, the polylactic acid, the calcium carbonate micro powder, the auxiliary agent and the compatibilizer A prepared in the step S1 according to a proportion, stirring and uniformly mixing at normal temperature, performing melt extrusion granulation by a double-screw extruder, and drying to obtain the calcium carbonate filled PBAT/PLA composite material;
s3, film blowing: and (5) putting the composite material prepared in the step S2 into a single-screw film blowing machine, blowing to form a film, and obtaining the calcium carbonate filled PBAT/PLA biodegradable plastic film at the extruder temperature of 140 ℃ and 170 ℃.
8. The method for preparing calcium carbonate filled PBAT/PLA biodegradable plastic film according to claim 7, wherein in the steps S1 and S2, the melt extrusion conditions are: length-diameter ratio of the twin-screw extruder 52: 1, the temperature of the extruder is 110-140 ℃, the screw rotation speed is 100-.
9. The method for preparing the calcium carbonate filled PBAT/PLA biodegradable plastic film according to claim 7, wherein in the step S1, the stirring conditions at normal temperature are as follows: stirring for 5min at the rotating speed of 300-;
in the step S2, the normal temperature stirring conditions are: the mixture was stirred for 15min at 300-.
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