阅读说明：本技术 一种全生物降解石墨烯基pbat包装袋的制备方法 (Preparation method of full-biodegradable graphene-based PBAT packaging bag ) 是由 孙友谊 欧康泰 于 2021-08-03 设计创作，主要内容包括：一种全生物降解石墨烯基PBAT包装袋的制备方法,属于新型碳材料石墨烯与生物可降解材料的交叉技术领域,本发明的目的在于提供一种PBAT在生物基材料中的应用,首先,设计合成一种生物可降解高分子修饰可再分散氧化石墨烯粉体,其次,基于自制改性石墨烯和改性碳酸钙,采用机械熔融共混法制得可生物降解石墨烯基PBAT母料,最后,将上述自制可生物降解石墨烯基PBAT母料采用吹膜工艺制得可生物降解石墨烯基PBAT包装袋。相对传统可降解包装袋,不仅拥有全生物降解和绿色环保特性,且含有的石墨烯对土壤具有优异的改良效果和肥效,同时制造成本低、包装袋强度和隔离性能好,制备过程简单,易于工业化生产和规模化推广。(The invention discloses a preparation method of a full-biodegradable graphene-based PBAT packaging bag, belongs to the technical field of crossing of novel carbon material graphene and a biodegradable material, and aims to provide an application of PBAT in a biological base material. Compared with the traditional degradable packaging bag, the degradable packaging bag has the characteristics of full biodegradation and environmental protection, the graphene contained in the degradable packaging bag has excellent improvement effect and fertilizer efficiency on soil, and meanwhile, the degradable packaging bag is low in manufacturing cost, good in strength and isolation performance of the packaging bag, simple in preparation process and easy for industrial production and large-scale popularization.)

1. A preparation method of a full-biodegradable graphene-based PBAT packaging bag is characterized by comprising the following steps: the method comprises the following steps:

first, preparation of redispersible graphene oxide

Adjusting the pH value of the graphene oxide dispersion liquid to 10-11 by ammonia water, then adding PVP (polyvinyl pyrrolidone), mechanically stirring at room temperature for 2 hours, then adding starch which can be dissolved at room temperature, continuously stirring for 2-4 hours, and finally, carrying out vacuum spray drying on the solution at the temperature of 60-70 ℃ to obtain the starch modified graphene oxide;

second, preparation of modified calcium carbonate

Dissolving a silane coupling agent in ethanol, blending the silane coupling agent with calcium carbonate by a wet method, naturally drying the mixture for 24 hours, further drying the mixture for 4 to 6 hours at the temperature of between 60 and 80 ℃, and then crushing the dried mixture by a crusher to obtain hydrophobic modified nano calcium carbonate;

thirdly, preparing the full-biodegradable graphene-based PBAT master batch

Dry blending the redispersible graphene oxide, maleic anhydride and PBAT master batch prepared in the first step by using a mechanical stirrer, wherein the stirring speed is 300-500 rpm, the stirring time is 0.5-1.0 h, further using a double-screw extruder, performing melt extrusion blending at the temperature of 155-;

fourthly, preparing the PBAT master batch modified by the fully biodegradable calcium carbonate

Dry blending the modified calcium carbonate prepared in the second step and the PBAT master batch by a mechanical stirrer at the stirring speed of 300rpm for 1.0h, further melting, extruding and blending by a double-screw extruder at the temperature of 155-;

fifthly, preparing the packaging bag by using a full-biodegradable graphene-based PBAT (poly (butylene adipate-co-terephthalate)) film blowing method

And (3) taking the graphene-based PBAT master batch prepared in the third step and the calcium carbonate modified PBAT master batch prepared in the fourth step, blending by a dry method by using a crushing and stirring machine, wherein the stirring speed is 300-500 rpm, the crushing time is 0.5h, using the blended material as a raw material, blowing a film by using a film blowing machine, and further using a bag making machine to prepare the packaging bag.

2. The preparation method of the fully biodegradable graphene-based PBAT packaging bag according to claim 1, characterized in that: in the first step, the starch is pre-gelatinized starch, and the mass ratio of the graphene oxide to the PVP to the starch is 1: 2-4: 15-100.

3. The preparation method of the fully biodegradable graphene-based PBAT packaging bag according to claim 1, characterized in that: the silane coupling agent in the second step includes any one of n-octyl triethoxysilane, phenyltrimethoxysilane, aminopropyltriethoxysilane, vinyltriethoxysilane, hexamethyldisilazane and vinyltrimethoxysilane.

4. The preparation method of the fully biodegradable graphene-based PBAT packaging bag according to claim 1, characterized in that: in the second step, the mass ratio of the calcium carbonate to the ethanol to the silane coupling agent is 100: 20-40: 1-5, and the particle size of the crushed modified nano calcium carbonate is 100-150 nm.

5. The preparation method of the fully biodegradable graphene-based PBAT packaging bag according to claim 1, characterized in that: in the third step, the mass ratio of the PBAT master batch to the redispersible graphene oxide to the maleic anhydride is 100: 5-20: 1-5, the granulated graphene-based PBAT master batch is in a disc shape, the diameter of the disc is 3-5 mm, and the height of the disc is 1-2 mm.

6. The preparation method of the fully biodegradable graphene-based PBAT packaging bag according to claim 1, characterized in that: and in the fourth step, the mass ratio of the PBAT master batch to the modified calcium carbonate is 1: 1-3, the granulated calcium carbonate modified PBAT master batch is in a disc shape, the diameter of the disc is 3-5 mm, and the height of the disc is 1-2 mm.

7. The preparation method of the fully biodegradable graphene-based PBAT packaging bag according to claim 1, characterized in that: and in the fifth step, the mass ratio of the graphene-based PBAT master batch to the calcium carbonate modified PBAT master batch is 1: 0.2-1.

8. The preparation method of the fully biodegradable graphene-based PBAT packaging bag according to claim 1, characterized in that: the thickness of the film in the fifth step is 0.01 mm-0.35 mm, the width of the packaging bag is 10-600 mm, and the length of the packaging bag is 100-800 mm.

Technical Field

The invention belongs to the technical field of intersection of novel carbon material graphene and biodegradable materials, and particularly relates to a preparation method of a full-biodegradable graphene-based PBAT packaging bag.

Background

The plastic shopping bags are consumable articles in daily life, and China consumes a large amount of plastic shopping bags every year. The plastic shopping bag provides convenience for consumers, and causes serious energy resource waste and environmental pollution due to excessive use, improper recycling treatment and the like. Particularly, the ultrathin plastic shopping bags are easy to damage, most of the ultrathin plastic shopping bags are randomly discarded, and the ultrathin plastic shopping bags become a main source of white pollution. More and more countries and regions have limited the production, sale, use of plastic shopping bags. These environmentally friendly shopping bag products are safe and environmentally friendly. In order to build a resource-saving and environment-friendly society, powerful measures are taken from the source to urge enterprises to produce durable and easily-degradable plastic shopping bags, so that the comprehensive utilization of resources is promoted, the ecological environment is protected, and the energy-saving and emission-reducing work is further promoted.

According to the source of raw materials, the biodegradable plastic comprises fossil-based biodegradable plastic and bio-based biodegradable plastic, the former is produced by coal, petroleum and natural gas raw materials, and the former mainly comprises dibasic acid and dihydric alcohol copolyester series (comprising PBAT, PBS and PBSA), Polycaprolactone (PCL), polyglycolic acid (PGA), polyvinyl alcohol (PVA) and CO₂Copolymers and the like; the latter is produced by using biomass raw materials, mainly including polylactic acid (PLA), Polyhydroxyalkanoate (PHA), full starch-based materials, cellulose materials and the like. The PBAT has the chemical name of Poly (butylene adipate)/terephthalate) and the English name of Poly (butylene-co-terephthalate), is a copolymer of the butylene adipate and the butylene terephthalate, has the characteristics of the PBA (Poly (butylene adipate) and the PBT (Poly (butylene terephthalate)), has better mechanical property, higher ductility and elongation at break and excellent biodegradability, and is a fully biodegradable plastic with excellent performance. As an important petroleum-based biodegradable plastic, PBAT production raw material sourceThe method is convenient and low in production cost, and is a hot spot concerned by the current industry.

However, PBAT has problems of poor crystallinity, low melt strength, and high price, compared to common plastics, and thus, its application in the fields of fibers and film materials is limited, and therefore, it is necessary to modify PBAT. The PBAT is used together with other degradable materials and inorganic fillers, so that the processing performance of the PBAT can be improved, the production cost can be reduced, the actual application requirements can be met, and the application range and the field of the PBAT can be widened. However, with the improvement of environmental requirements and the requirement of sustainable green development, the demand for degradable materials is more and more intense, and the development of high-performance and low-cost PBAT and composite materials thereof is a popular field for processing high polymer materials, and plays an important role in promoting the application of biodegradable materials in bio-based materials and realizing green development.

Disclosure of Invention

The invention provides a preparation method of a fully biodegradable graphene-based PBAT packaging bag, aiming at the problem that the PBAT is limited in application in the fields of fibers and membrane materials due to poor crystallinity, low melt strength, high price and the like.

The invention adopts the following technical scheme:

a preparation method of a full-biodegradable graphene-based PBAT packaging bag comprises the following steps:

first, preparation of redispersible graphene oxide

Adjusting the pH value of the graphene oxide dispersion liquid to 10-11 by ammonia water, then adding PVP (polyvinyl pyrrolidone), mechanically stirring at room temperature for 2 hours, then adding starch which can be dissolved at room temperature, continuously stirring for 2-4 hours, and finally, carrying out vacuum spray drying on the solution at the temperature of 60-70 ℃ to obtain the starch modified graphene oxide;

second, preparation of modified calcium carbonate

Dissolving a silane coupling agent in ethanol, blending the silane coupling agent with calcium carbonate by a wet method, naturally drying the mixture for 24 hours, further drying the mixture for 4 to 6 hours at the temperature of between 60 and 80 ℃, and then crushing the dried mixture by a crusher to obtain hydrophobic modified nano calcium carbonate;

thirdly, preparing the full-biodegradable graphene-based PBAT master batch

Dry blending the redispersible graphene oxide, maleic anhydride and PBAT master batch prepared in the first step by using a mechanical stirrer, wherein the stirring speed is 300-500 rpm, the stirring time is 0.5-1.0 h, further using a double-screw extruder, performing melt extrusion blending at the temperature of 155-;

fourthly, preparing the PBAT master batch modified by the fully biodegradable calcium carbonate

Dry blending the modified calcium carbonate prepared in the second step and the PBAT master batch by a mechanical stirrer at the stirring speed of 300rpm for 1.0h, further melting, extruding and blending by a double-screw extruder at the temperature of 155-;

fifthly, preparing the packaging bag by using a full-biodegradable graphene-based PBAT (poly (butylene adipate-co-terephthalate)) film blowing method

And (3) taking the graphene-based PBAT master batch prepared in the third step and the calcium carbonate modified PBAT master batch prepared in the fourth step, blending by a dry method by using a crushing and stirring machine, wherein the stirring speed is 300-500 rpm, the crushing time is 0.5h, using the blended material as a raw material, blowing a film by using a film blowing machine, and further using a bag making machine to prepare the packaging bag.

Further, in the first step, the starch is pre-gelatinized starch, and the mass ratio of the graphene oxide to the PVP to the starch is 1: 2-4: 15-100.

Further, the silane coupling agent in the second step includes any one of n-octyltriethoxysilane, phenyltrimethoxysilane, aminopropyltriethoxysilane, vinyltriethoxysilane, hexamethyldisilazane, and vinyltrimethoxysilane.

Furthermore, in the second step, the mass ratio of the calcium carbonate to the ethanol to the silane coupling agent is 100: 20-40: 1-5, and the particle size of the crushed modified nano calcium carbonate is 100-150 nm.

Further, in the third step, the mass ratio of the PBAT master batch to the redispersible graphene oxide to the maleic anhydride is 100: 5-20: 1-5, the pelletized graphene-based PBAT master batch is in a disc shape, the diameter of the disc is 3-5 mm, and the height of the disc is 1-2 mm.

Further, the mass ratio of the PBAT master batch to the modified calcium carbonate in the fourth step is 1: 1-3, the granulated calcium carbonate modified PBAT master batch is in a disc shape, the diameter of the disc is 3-5 mm, and the height of the disc is 1-2 mm.

Further, the mass ratio of the graphene-based PBAT master batch to the calcium carbonate modified PBAT master batch in the fifth step is 1: 0.2-1.

Further, the thickness of the film in the fifth step is 0.01 mm-0.35 mm, the width of the packaging bag is 10-600 mm, and the length of the packaging bag is 100-800 mm.

The invention has the following beneficial effects:

the invention firstly designs and synthesizes biodegradable high-molecular-weight-modified redispersible graphene oxide powder, secondly prepares biodegradable graphene-based PBAT master batch by adopting a mechanical melt blending method based on self-made modified graphene and modified calcium carbonate, and finally prepares the biodegradable graphene-based PBAT packaging bag by adopting a film blowing process on the self-made biodegradable graphene-based PBAT master batch. Compared with the traditional degradable packaging bag, the degradable packaging bag has the characteristics of full biodegradation and environmental protection, the graphene contained in the degradable packaging bag has excellent improvement effect and fertilizer efficiency on soil, and meanwhile, the degradable packaging bag is low in manufacturing cost, good in strength and isolation performance of the packaging bag, simple in preparation process and easy for industrial production and large-scale popularization.

Detailed Description

A preparation method of a full-biodegradable graphene-based PBAT packaging bag comprises the following steps:

first, preparation of redispersible graphene oxide

Adjusting the pH value of the graphene oxide dispersion liquid to 10-11 by ammonia water, then adding PVP (polyvinyl pyrrolidone), mechanically stirring at room temperature for 2 hours, then adding starch which can be dissolved at room temperature, continuously stirring for 2-4 hours, and finally, carrying out vacuum spray drying on the solution at the temperature of 60-70 ℃ to obtain the starch modified graphene oxide;

second, preparation of modified calcium carbonate

Dissolving a silane coupling agent in ethanol, blending the silane coupling agent with calcium carbonate by a wet method, naturally drying the mixture for 24 hours, further drying the mixture for 4 to 6 hours at the temperature of between 60 and 80 ℃, and then crushing the dried mixture by a crusher to obtain hydrophobic modified nano calcium carbonate;

thirdly, preparing the full-biodegradable graphene-based PBAT master batch

Dry blending the redispersible graphene oxide, maleic anhydride and PBAT master batch prepared in the first step by using a mechanical stirrer, wherein the stirring speed is 300-500 rpm, the stirring time is 0.5-1.0 h, further using a double-screw extruder, performing melt extrusion blending at the temperature of 155-;

fourthly, preparing the PBAT master batch modified by the fully biodegradable calcium carbonate

Dry blending the modified calcium carbonate prepared in the second step and the PBAT master batch by a mechanical stirrer at the stirring speed of 300rpm for 1.0h, further melting, extruding and blending by a double-screw extruder at the temperature of 155-;

fifthly, preparing the packaging bag by using a full-biodegradable graphene-based PBAT (poly (butylene adipate-co-terephthalate)) film blowing method

And (3) taking the graphene-based PBAT master batch prepared in the third step and the calcium carbonate modified PBAT master batch prepared in the fourth step, blending by a dry method by using a crushing and stirring machine, wherein the stirring speed is 300-500 rpm, the crushing time is 0.5h, using the blended material as a raw material, blowing a film by using a film blowing machine, and further using a bag making machine to prepare the packaging bag.

Example 1

Adjusting the pH value of 10.0g of graphene oxide dispersion liquid to be 10, then adding 20.0g of PVP, mechanically stirring at room temperature for 2h, then adding 200g of starch capable of being dissolved at room temperature, and continuously stirring for 4 h. And finally, carrying out vacuum spray drying on the solution at the low temperature of 70 ℃ to obtain the starch modified graphene oxide.

Dissolving 10.0g n-octyltriethoxysilane in 80ml ethanol, mixing with 100g calcium carbonate by wet method, naturally drying for 24h, further drying at 80 deg.C for 6h, and pulverizing with pulverizer to obtain hydrophobic modified nano calcium carbonate with particle size of 100 nm.

And dry blending the 10.0g of redispersible graphene oxide, 2.0g of maleic anhydride and 60.0g of PBAT master batch by using a mechanical stirrer, wherein the stirring speed is 300rpm, and the stirring time is 0.5 h. And further adopting a double-screw extruder, carrying out melt extrusion blending at the temperature of 155 ℃, and finally carrying out air cooling, wherein the obtained material is cut into a disk-shaped graphene-based PBAT master batch, the diameter of a disk is 5mm, and the height of the disk is 2 mm.

And dry blending the 30.0g of modified calcium carbonate and 70.0g of PBAT master batch by a mechanical stirrer at the stirring speed of 300rpm for 1.0 h. And further adopting a double-screw extruder, carrying out melt extrusion blending at the temperature of 165 ℃, and finally carrying out air cooling, wherein the cut particles are disk-shaped modified calcium carbonate filled PBAT master batch, the diameter of the disk is 5mm, and the height of the disk is 2 mm.

60.0g of graphene-based PBAT master batch and 40.0g of calcium carbonate modified PBAT master batch are taken, dry blending is carried out by a crushing and stirring machine, the stirring speed is 400rpm, the crushing time is 0.5h, the blended material is taken as a raw material, a film blowing machine is adopted to blow a film with the thickness of 0.1mm, and then a bag making machine is adopted to prepare a packaging bag with the width of 200mm and the length of 600 mm.

Example 2

Adjusting the pH value of 10.0g of graphene oxide dispersion liquid to be 10, then adding 0.4g of PVP, mechanically stirring at room temperature for 2h, then adding 150g of starch capable of being dissolved at room temperature, and continuously stirring for 4 h. And finally, carrying out vacuum spray drying on the solution at the low temperature of 70 ℃ to obtain the starch modified graphene oxide.

Dissolving 10.0g n-octyltriethoxysilane in 80ml ethanol, mixing with 100g calcium carbonate by wet method, naturally drying for 24h, further drying at 80 deg.C for 6h, and pulverizing with pulverizer to obtain hydrophobic modified nano calcium carbonate with particle size of 100 nm.

And dry blending the 10.0g of redispersible graphene oxide, 2.0g of maleic anhydride and 60.0g of PBAT master batch by using a mechanical stirrer, wherein the stirring speed is 300rpm, and the stirring time is 0.5 h. And further adopting a double-screw extruder, carrying out melt extrusion blending at the temperature of 155 ℃, and finally carrying out air cooling, wherein the obtained material is cut into a disk-shaped graphene-based PBAT master batch, the diameter of a disk is 5mm, and the height of the disk is 2 mm.

And dry blending the 30.0g of modified calcium carbonate and 70.0g of PBAT master batch by a mechanical stirrer at the stirring speed of 300rpm for 1.0 h. And further adopting a double-screw extruder, carrying out melt extrusion blending at the temperature of 165 ℃, and finally carrying out air cooling, wherein the cut particles are disk-shaped modified calcium carbonate filled PBAT master batch, the diameter of the disk is 5mm, and the height of the disk is 2 mm.

60.0g of graphene-based PBAT master batch and 40.0g of calcium carbonate modified PBAT master batch are taken, dry blending is carried out by a crushing and stirring machine, the stirring speed is 400rpm, the crushing time is 0.5h, the blended material is taken as a raw material, a film blowing machine is adopted to blow a film with the thickness of 0.1mm, and then a bag making machine is adopted to prepare a packaging bag with the width of 200mm and the length of 600 mm.

Example 3

Adjusting the pH value of 10.0g of graphene oxide dispersion liquid to be 10, then adding 0.4g of PVP, mechanically stirring at room temperature for 2h, then adding 200g of starch capable of being dissolved at room temperature, and continuously stirring for 4 h. And finally, carrying out vacuum spray drying on the solution at the low temperature of 70 ℃ to obtain the starch modified graphene oxide.

Dissolving 10.0g n-octyltriethoxysilane in 80ml ethanol, mixing with 100g calcium carbonate by wet method, naturally drying for 24h, further drying at 80 deg.C for 6h, and pulverizing with pulverizer to obtain hydrophobic modified nano calcium carbonate with particle size of 150 nm.

And dry blending the 10.0g of redispersible graphene oxide, 2.0g of maleic anhydride and 60.0g of PBAT master batch by using a mechanical stirrer, wherein the stirring speed is 300rpm, and the stirring time is 0.5 h. And further adopting a double-screw extruder, carrying out melt extrusion blending at the temperature of 155 ℃, and finally carrying out air cooling, wherein the obtained material is cut into a disk-shaped graphene-based PBAT master batch, the diameter of a disk is 3mm, and the height of the disk is 1 mm.

And dry blending the 30.0g of modified calcium carbonate and 70.0g of PBAT master batch by a mechanical stirrer at the stirring speed of 300rpm for 1.0 h. And further adopting a double-screw extruder, carrying out melt extrusion blending at the temperature of 165 ℃, and finally carrying out air cooling, wherein the cut particles are disk-shaped modified calcium carbonate filled PBAT master batch, the diameter of a disk is 3mm, and the height of the disk is 1 mm.

60.0g of graphene-based PBAT master batch and 40.0g of calcium carbonate modified PBAT master batch are taken, dry blending is carried out by a crushing and stirring machine, the stirring speed is 400rpm, the crushing time is 0.5h, the blended material is taken as a raw material, a film blowing machine is adopted to blow a film with the thickness of 0.1mm, and then a bag making machine is adopted to prepare a packaging bag with the width of 200mm and the length of 600 mm.

Example 4

Adjusting the pH value of 10.0g of graphene oxide dispersion liquid to be 10, then adding 0.4g of PVP, mechanically stirring at room temperature for 2h, then adding 200g of starch capable of being dissolved at room temperature, and continuously stirring for 4 h. And finally, carrying out vacuum spray drying on the solution at the low temperature of 70 ℃ to obtain the starch modified graphene oxide.

Dissolving 10.0g n-octyltriethoxysilane in 80ml ethanol, mixing with 100g calcium carbonate by wet method, naturally drying for 24h, further drying at 80 deg.C for 6h, and pulverizing with pulverizer to obtain hydrophobic modified nano calcium carbonate with particle size of 100 nm.

And dry blending the 10.0g of redispersible graphene oxide, 2.0g of maleic anhydride and 60.0g of PBAT master batch by using a mechanical stirrer, wherein the stirring speed is 300rpm, and the stirring time is 0.5 h. And further adopting a double-screw extruder, carrying out melt extrusion blending at the temperature of 155 ℃, and finally carrying out air cooling, wherein the obtained material is cut into a disk-shaped graphene-based PBAT master batch, the diameter of a disk is 5mm, and the height of the disk is 2 mm.

And dry blending the 40.0g of modified calcium carbonate and 60.0g of PBAT master batch by a mechanical stirrer at the stirring speed of 300rpm for 1.0 h. And further adopting a double-screw extruder, carrying out melt extrusion blending at the temperature of 165 ℃, and finally carrying out air cooling, wherein the cut particles are disk-shaped modified calcium carbonate filled PBAT master batch, the diameter of the disk is 5mm, and the height of the disk is 2 mm.

60.0g of graphene-based PBAT master batch and 40.0g of calcium carbonate modified PBAT master batch are taken, dry blending is carried out by a crushing and stirring machine, the stirring speed is 400rpm, the crushing time is 0.5h, the blended material is taken as a raw material, a film blowing machine is adopted to blow a film with the thickness of 0.1mm, and then a bag making machine is adopted to prepare a packaging bag with the width of 200mm and the length of 600 mm.

Example 5

Adjusting the pH value of 10.0g of graphene oxide dispersion liquid to be 10, then adding 0.4g of PVP, mechanically stirring at room temperature for 2h, then adding 200g of starch capable of being dissolved at room temperature, and continuously stirring for 4 h. And finally, carrying out vacuum spray drying on the solution at the low temperature of 70 ℃ to obtain the starch modified graphene oxide.

Dissolving 10.0g n-octyltriethoxysilane in 80ml ethanol, mixing with 100g calcium carbonate by wet method, naturally drying for 24h, further drying at 80 deg.C for 6h, and pulverizing with pulverizer to obtain hydrophobic modified nano calcium carbonate with particle size of 100 nm.

And dry blending the 10.0g of redispersible graphene oxide, 2.0g of maleic anhydride and 60.0g of PBAT master batch by using a mechanical stirrer, wherein the stirring speed is 300rpm, and the stirring time is 0.5 h. And further adopting a double-screw extruder, carrying out melt extrusion blending at the temperature of 155 ℃, and finally carrying out air cooling, wherein the obtained material is cut into a disk-shaped graphene-based PBAT master batch, the diameter of a disk is 5mm, and the height of the disk is 2 mm.

And dry blending the 30.0g of modified calcium carbonate and 70.0g of PBAT master batch by a mechanical stirrer at the stirring speed of 300rpm for 1.0 h. And further adopting a double-screw extruder, carrying out melt extrusion blending at the temperature of 165 ℃, and finally carrying out air cooling, wherein the cut particles are disk-shaped modified calcium carbonate filled PBAT master batch, the diameter of the disk is 5mm, and the height of the disk is 2 mm.

Taking 70.0g of graphene-based PBAT master batch and 30.0g of calcium carbonate modified PBAT master batch, blending by a dry method by using a crushing and stirring machine, wherein the stirring speed is 400rpm, the crushing time is 0.5h, taking the blend as a raw material, adopting a film blowing machine to blow a film with the thickness of 0.1mm, and further adopting a bag making machine to prepare a packaging bag with the width of 200mm and the length of 600 mm.

TABLE 1 Performance of bio-bags of different formulations (tested according to GB/T38082-2019 national Standard)