TWI869176B - Biodegradable material containing plant fiber and its manufacturing method - Google Patents

Abstract

The present invention provides a plant fiber-containing biodegradable material and a manufacturing method thereof. The plant fiber-containing biodegradable material comprises: PBAT within a specific content range, plant fiber powder, a degradation aid and a biodegradation adjuvant. The manufacturing method comprises the following steps: preparing manufacturing equipment, the manufacturing equipment comprising an electric mixer, a first combination to a fourth combination of material bin barrels each equipped with a vector scale metering machine, and a granulation host; the granulation host comprises a parallel twin-screw extruder and a discharge port die. The above raw materials are added to the corresponding first combination to the fourth combination respectively, and then transported to the parallel twin-screw extruder after being measured and proportioned by the vector scale metering machine, and the materials in the parallel twin-screw extruder are mixed and passed through the discharge port die to obtain the plant fiber-containing biodegradable material.

Description

Biodegradable material containing plant fiber and its manufacturing method

The present invention relates to the technical field of biodegradable materials, and in particular to a biodegradable material containing plant fibers that can be used in agricultural mulching film or paper and a method for manufacturing the same.

Traditional paper materials are mostly made from wood. As forest resources become increasingly scarce, the raw materials for papermaking are greatly limited, causing production costs to continue to rise. In addition, the traditional papermaking process using wood as raw material requires the use of sulfides to accelerate the decomposition of fibers in the raw materials, and the cooking wastewater in the pulping process often contains strong acids or strong alkalis that are toxic to aquatic organisms. If not properly handled, it may cause serious environmental pollution problems.

In addition, the most common agricultural films (also known as ground films) are usually made of synthetic resins, such as polyethylene or polypropylene, because they have advantages such as light weight and good barrier properties. However, they are difficult to decompose during waste disposal after use, causing white pollution. Alternatively, they may decompose into plastic particles, causing soil and environmental pollution, and even affecting the yield of crops.

With the increasing awareness of environmental protection, in order to solve the problems of traditional plastic agricultural films, products mainly using polylactic acid (PLA) as agricultural films have been developed on the market. However, although it has advantages such as biodegradability and recyclability, PLA itself has defects such as high cost and poor ductility. Therefore, agricultural films mainly made of PLA have not been successfully promoted to various agricultural films, or even other film products or paper.

In view of the technical defects of the above-mentioned existing technologies, the purpose of the present invention is to provide a biodegradable material that can save energy and reduce production costs; in addition, the paper or agricultural film made from the above-mentioned biodegradable material can be degraded and returned to nature after disposal to reduce land and environmental pollution, and has the advantages of being environmentally friendly. It can also increase soil nutrients and be easily absorbed and utilized by plants, so as to achieve sustainable development of resource recycling, and has good ecological and economic benefits.

In addition, another purpose of the present invention is to provide a biodegradable material, the agricultural film made from which can have dynamic and multi-directional adjustment functions, and can easily meet the temperature, moisture, air permeability and other requirements of various crops with different growth periods.

To achieve the above-mentioned object, the present invention provides a plant fiber-containing biodegradable material, which comprises: based on the total weight of the plant fiber-containing biodegradable material, 15 weight percentage (weight percentage, wt%) to 50 weight% of polybutylene adipate terephthalate (PBAT); 30 weight% to 65 weight% of plant fiber powder; 0.1 weight% to 10 weight% of a degradation aid; and 2 weight% to 10 weight% of a biodegradation adjuvant. The raw materials of the plant fiber powder include bamboo, cassava or a combination thereof; the degradation aid includes a water-resistant agent, a bulking agent, an antioxidant, an anti-ultraviolet agent, a dispersant or a combination thereof; the biodegradable adjuvant includes polybutylene succinate (PBS), polyhydroxyalkanoates (PHAs), polylactic acid or a combination thereof.

The plant fiber-containing biodegradable material of the present invention is added with a specific plant fiber powder of a specific content and a specific degradable base resin (PBAT) of a specific content range and a specific material as an auxiliary agent, so that the agricultural film or paper made from the plant fiber-containing biodegradable material can be degraded into carbon dioxide (CO ₂ ) and water (H ₂ O) under appropriate water and oxygen conditions. Therefore, after the harvest of crops, the agricultural film can be directly turned into the soil by a farm machine and wait for it to degrade into fertilizer by itself, which can save the manpower and expenses of farmers. Furthermore, the raw materials of the plant fiber powder mainly come from bamboo and food-grade cassava. Since cassava and bamboo grow fast and do not require much care, they are easy to obtain raw materials, so the overall production cost can be reduced, which is suitable for diversified subsequent applications. In addition, the agricultural film or paper made from the plant fiber-containing biodegradable material will not generate toxic gas during the degradation process, will not harm the health of organisms, and can protect the environment, which is in line with the trend of sustainable development.

Preferably, based on the total weight of the plant fiber-containing biodegradable material, the content of PBAT is 20wt% to 45wt%; the content of the plant fiber powder is 35wt% to 60wt%; the content of the degradation aid is 0.5wt% to 10wt%; and the content of the biodegradation adjuvant is 3wt% to 10wt%.

According to the present invention, the PBAT is a thermoplastic biodegradable material with good ductility and elongation at break, excellent biodegradability, and the advantages of low cost and easy availability, but not limited thereto. In addition, since the growth cycles of various crops are different, the amount of PBAT can be adjusted to meet the needs of various crops. On the one hand, when the content of PBAT is 30wt% to 50wt%, it is suitable for crops with a shorter growth cycle; on the other hand, when the content of PBAT is 15wt% to 28wt%, it is suitable for crops with a longer growth cycle.

According to the present invention, the anti-ultraviolet agent is a light stabilizer that can inhibit or weaken the degradation of the agricultural film by light, and can prevent the agricultural film from being harmed by ultraviolet light, thereby effectively inhibiting light degradation. The antioxidant is a kind of agent that prevents the agricultural film from being easily oxidized in the atmosphere, so it can inhibit the premature corrosion of the agricultural film. Accordingly, by using the anti-ultraviolet agent and the antioxidant in combination, the functional period of the agricultural film can be further extended and the stability of the agricultural film can be maintained. Preferably, based on the total weight of the plant fiber-containing biodegradable material, the content of the antioxidant is 0.1wt% to 0.5wt%, and the content of the anti-ultraviolet agent is 0.1wt% to 0.5wt%, but not limited thereto.

According to the present invention, the water-resistant agent can resist the destructive power of water, so it can further make the agricultural film less likely to be penetrated by water, and meet the temperature, moisture, air permeability and other requirements of the covered crops. In addition, the dispersant can be, but is not limited to, maleic anhydride, which can increase the compatibility and dispersibility between different raw materials, so that the plant fiber-containing biodegradable material can be more tightly combined as a whole.

In some embodiments, the degradation aid may include a combination of the water-resistant agent, the extender, the antioxidant, the UV-resistant agent, and the dispersant, but is not limited thereto.

According to the present invention, the biodegradable adjuvant can be used as a secondary carrier to assist PBAT. The PBS has excellent degradation performance, good mechanical properties and heat resistance, but is not limited to this. The PHA has biodegradability and biocompatibility, and is therefore considered an environmentally friendly material, but is not limited to this. The PLA is a new type of bio-based renewable biodegradable material, but is not limited to this.

In some embodiments, the plant fiber-containing biodegradable material can be used to manufacture agricultural films or papers. Specifically, the agricultural film made from the plant fiber-containing biodegradable material can have an average thickness of 5 micrometers (μm) to 100 μm, but is not limited thereto.

The present invention also provides a method for preparing the aforementioned biodegradable material containing plant fibers, which does not require felling trees, making wood pulp, washing with water, or strong acid, strong alkali, or bleaching agent. Therefore, the process can reduce water consumption and waste gas, and will not generate wastewater discharge or pollute water resources. It can not only preserve forest resources and reduce production costs, but also reduce secondary pollution generated in the papermaking process. Moreover, the preparation process is simple and can improve production efficiency.

The manufacturing method of the plant fiber-containing biodegradable material comprises the following steps: Step (S1): a manufacturing device is prepared; the manufacturing device comprises an electric mixer, four groups of material storage barrels each equipped with a vector scale metering machine, and a granulation host; wherein, a plurality of feeders are arranged on one side of the electric mixer; the four groups of material storage barrels each equipped with a vector scale metering machine are the first group to the fourth group; in each group, the vector scale metering machine is arranged at the outlet of the material storage barrel; the granulation host comprises It comprises a main motor, a parallel twin-screw extruder and a discharge die, one side of the parallel twin-screw extruder is connected to the main motor, and the other side of the parallel twin-screw extruder is connected to the discharge die; the parallel twin-screw extruder is arranged downstream of the vector scale metering machine of the material bin barrel; Step (S2): adding PBAT to the first combination, after the vector scale metering machine in the first combination measures the proportion, it is then transported to the parallel twin-screw extruder; Step (S3): preparing the plants The plant fiber powder is added to the second combination, and after being measured and proportioned by the vector scale measuring machine in the second combination, it is then transported to the parallel twin-screw extruder; wherein the raw material of the plant fiber powder comprises bamboo, cassava or a combination thereof; step (S4): adding a degradation agent to the third combination, and after being measured and proportioned by the vector scale measuring machine in the third combination, it is then transported to the parallel twin-screw extruder; wherein the degradation agent comprises a water-resistant agent, a volume expander, an antioxidant, an anti-ultraviolet light agent, agent, dispersant or a combination thereof; step (S5): adding a biodegradable adjuvant to the fourth combination, after being measured and proportioned by the vector scale meter in the fourth combination, it is then transported to the parallel twin-screw extruder; wherein the biodegradable adjuvant comprises polybutylene succinate, polyhydroxy fatty acid ester, polylactic acid or a combination thereof; and step (S6): mixing the materials in the parallel twin-screw extruder and then outputting them through the discharge die to obtain the aforementioned plant fiber-containing biodegradable material.

The present invention measures and proportions plant fiber powder, base resin (PBAT, which can be used as the main carrier) and other specific raw materials through a material bin equipped with a vector scale metering machine, and then inputs them into a parallel twin-screw extruder for full mixing before outputting. The entire manufacturing process does not require felling of trees, washing with water, or the use of strong acids, strong alkalis and bleaching agents. It does not generate wastewater discharge, water resource pollution or exhaust gas emission problems, so it does not cause pollution to the environment, water resources and air, and can achieve energy saving and carbon reduction. In addition, the manufacturing method can effectively simplify the control points of the overall process and has the advantages of simple process. In addition, the agricultural film or paper produced in the end can be degraded in the natural environment, so it will not accumulate waste like plastic products after use, and has good ecological and economic benefits.

According to the present invention, the plant fiber powder can be prepared using commercially available products or known raw materials. For example, the plant fiber powder can be obtained by the following method: the raw materials of the plant fiber powder (i.e. bamboo and/or cassava) are ground into fine powder with an average particle size of 100 mesh to 2000 mesh to obtain the plant fiber powder. In some embodiments, when the raw materials include the bamboo, fresh bamboo can be selected first, and then the skin and some segments of the outer layer of the bamboo can be removed; then, the bamboo can be cut into a plurality of small segments, each of which is about 1 cm to 2 cm in length, and then the small segments are dried in the sun; finally, the dried bamboo is ground with a stone mill to the above average particle size. Alternatively, the above fine powder can be processed in other known ways, but is not limited thereto. According to the present invention, the average particle size of the fine powder is defined as D90; D90 refers to the particle size corresponding to 90% of the cumulative particle size distribution of a sample. In some embodiments, in order to activate the aforementioned plant fiber powder, the fine powder can be placed in the heated electric mixer and stirred for 30 minutes to 60 minutes to complete the activation process to obtain activated plant fiber powder (i.e., activated cassava powder or activated bamboo powder). Alternatively, the aforementioned fine powder is activated in other known ways, but is not limited thereto.

Preferably, the plant fiber powder is a food grade ingredient, for example, commercially available food grade products can be used, so the obtained plant fiber-containing biodegradable material is also a food grade product.

Preferably, the temperature of the parallel twin-screw extruder in the step (S6) is 100°C to 150°C. Specifically, the parallel twin-screw extruder can be divided into 11 temperature zones. In the step (S6), the temperatures of the 11 temperature zones of the parallel twin-screw extruder are 100°C-110°C-120°C-130°C-140°C-140°C-135°C-130°C-120°C-120°C-120°C in sequence, but not limited thereto.

In some embodiments, the granulation main machine may further include a main machine feed port and at least one side feeder; the main machine feed port is respectively connected to a part of the vector scale metering machine in the combination and the parallel twin-screw extruder; the feed port of the at least one side feeder is connected to the vector scale metering machine in one of the remaining parts of the combination, and the feed port of the at least one side feeder is connected to the parallel twin-screw extruder.

Specifically, in the manufacturing equipment, the granulation host machine may further include a host machine feed port and two sets of side feeders. In some embodiments, the host machine feed port is respectively connected to the vector scale measuring machines of the first combination and the third combination, and the host machine feed port is connected to the parallel twin-screw extruder; the feed ports of the two sets of side feeders are respectively connected to the vector scale measuring machines of the second combination and the fourth combination, and the feed ports of the two sets of side feeders are connected to the parallel twin-screw extruder, but not limited to this.

Preferably, the discharge die head can be equipped with a vector scale measuring machine.

Preferably, the accuracy of the aforementioned vector scale measuring machines is 0.1%, but not limited to this.

In some embodiments, the discharge die head may be a stripe die head or a flat die head, but is not limited thereto. When the discharge die head is a stripe die head, the obtained biodegradable material containing plant fibers is in the form of granules; when the discharge die head is a flat die head, the obtained biodegradable material containing plant fibers is in the form of sheets (i.e., it can be directly used as a sheet-shaped agricultural film and/or paper). In addition, the granular biodegradable material containing plant fibers can be blown into the agricultural film and/or packaging film bag by a film blowing machine, but is not limited thereto.

In some embodiments, the manufacturing equipment may further include a conveyor belt and a cutter. One end of the conveyor belt is connected to the discharge die head; the other end of the conveyor belt is connected to the cutter; wherein the discharge die head is a hole die head. Preferably, the manufacturing equipment may further include a vibrating screening machine and a finished product warehouse; wherein the other side of the cutter (relative to one side of the discharge die head) is connected to one side of the vibrating screening machine, and the other side of the vibrating screening machine is connected to the finished product warehouse.

In other embodiments, the manufacturing equipment may further include a pull-tab host; the pull-tab host includes a pull-tab device and a film rolling machine; the discharge die is connected to one side of the pull-tab device, and the other side of the pull-tab device is connected to the film rolling machine; wherein the discharge die is a flat die.

The agricultural film (e.g., 10 μm thick) made of the plant fiber-containing biodegradable material of the present invention can be degraded to more than 90% after being covered in the farmland for 80 days.

The agricultural film (e.g., 15 μm thick) made of the plant fiber-containing biodegradable material of the present invention is used to cultivate crops in greenhouses. For example, covering tomatoes with the aforementioned agricultural film can retain water, moisture, and increase the fungal nutrients in the soil, thereby improving the productivity of crops.

Furthermore, the paper made from the plant fiber-containing biodegradable material of the present invention can be cut into different sizes and thicknesses according to needs, and the raw materials can be food-grade raw materials (non-toxic and free of heavy metals) and will not harm health. Therefore, it is suitable for use in edible utensils such as tea cups, coffee cups, straws, etc. and packaging materials for daily necessities or for use by children.

In summary, the plant fiber-containing biodegradable material of the present invention has dynamic and multi-directional adjustment functions, and the degradation time of the agricultural film produced can be adjusted by adjusting each component within the aforementioned range, so that the temperature, moisture, air permeability and other requirements of different crops or the same crops in different growth periods can be met. However, despite the different degradation cycles, they can all achieve complete biodegradation, so the agricultural film or paper produced by the present invention can not only be biodegraded but also composted, which can effectively combat white pollution. Furthermore, the plant fiber-containing biodegradable material of the present invention does not contain eight heavy metals; does not contain 6P plastics (PE, PP, PVC, PS, PET, PC), etc. Therefore, when the agricultural film or paper produced is disposed of by landfill after disposal, it will not cause soil pollution and has good ecological and economic benefits.

1: Manufacturing equipment

10: Electric mixer

11: Loading machine

20: Granulation host machine

21: Main engine motor

22: Parallel twin screw extruder

23: Discharge port die head

24: Main machine unloading port

25: Side feeder

30: Material storage barrel

31: Vector scale measuring machine

40: Conveyor belt

50: Cutting machine

60: Vibration screening machine

70: Finished product warehouse

80: Pull tab host

81: Pull tab device

82: Film winding machine

Figure 1 is a schematic diagram of the manufacturing equipment in the manufacturing method of plant fiber-containing biodegradable materials in Example 1.

Figure 2 is a schematic diagram of the manufacturing equipment in the manufacturing method of plant fiber-containing biodegradable materials in Example 2.

In the following, several preparation examples are listed to illustrate the implementation methods for making the present invention. The technical personnel in this field can easily understand the advantages and effects that the present invention can achieve through the content of the following embodiments. Therefore, it should be understood that the description provided herein is only used to illustrate the preferred implementation method and is not used to limit the scope of the present invention. Various modifications and changes can be made to implement or apply the content of the present invention without departing from the spirit and scope of the present invention.

In the description of the present invention, it should be noted that if the directions or positional relationships indicated by "upper", "lower", "inner", "outer", "left", "right" and the like are used, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and do not mean or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the specific direction cannot be understood as a limitation of the present invention.

Example 1

As shown in FIG. 1 , the manufacturing equipment 1 used in the manufacturing method of the plant fiber-containing biodegradable material of this embodiment includes: an electric mixer 10, a granulation host machine 20, four sets of material bin barrels 30 each equipped with a vector scale metering machine 31 (i.e., the first set to the fourth set), a conveyor belt 40, a material cutter 50, a vibrating screen inspection machine 60, and a finished product bin 70.

Four sets of loading machines 11 are installed on one side of the electric mixer 10, and the raw materials for manufacturing the biodegradable materials containing plant fibers are respectively injected into the material storage barrels 30 as described in the following steps (S2) to (S5). Among them, the four sets of material storage barrels 30 each equipped with a vector scale metering machine 31 are the first to fourth sets; in each set, each vector scale metering machine 31 is installed at the outlet of each corresponding material storage barrel 30 to measure and proportion the above-mentioned raw materials.

The granulation host machine 20 includes a host motor 21, a parallel twin-screw extruder 22 and a discharge die 23. One side (left side) of the parallel twin-screw extruder 22 is connected to the host motor 21, and the other side (right side) of the parallel twin-screw extruder 22 is connected to the discharge die 23. The parallel twin-screw extruder 22 is arranged downstream of the vector scale metering machine 31 matched with the material storage barrel 30, and is used to receive and mix the raw materials measured and outputted from the vector scale metering machine 31 of the material storage barrel 30.

Furthermore, the granulation host 20 further includes a host feed port 24 and two sets of side feeders 25. The vector scale measuring machine 31 in the first combination and the third combination corresponds to and is connected to the host feed port 24; the vector scale measuring machine 31 in the second combination and the fourth combination corresponds to and is connected to the feed ports of the two sets of side feeders 25, respectively. Moreover, the host feed port 24 and the feed ports of the two sets of side feeders 25 are both connected to the parallel twin-screw extruder 22.

In addition, the discharge die head 23 in this embodiment is a strip hole die head; the discharge die head 23 is connected to one end (left end) of the conveyor belt 40, and the other end (right end) of the conveyor belt 40 is connected to one side (left side) of the cutter 50. The other side (right side) of the cutter 50 is connected to one side (upper side) of the vibrating screen inspection machine 60, and the other side (lower side) of the vibrating screen inspection machine 60 is connected to the finished product bin 70.

Specifically, the manufacturing method of the plant fiber-containing biodegradable material of the present embodiment comprises the following steps: step (S1): preparing the aforementioned manufacturing device 1; step (S2): adding PBAT to the first combination, and then conveying it to the parallel twin-screw extruder 22 after measuring the ratio by the vector scale measuring machine 31 in the first combination; step (S3): preparing plant fiber powder, and adding the plant fiber powder to the second combination, and then conveying it to the parallel twin-screw extruder 22 after measuring the ratio by the vector scale measuring machine 31 in the second combination; step (S4): ): adding the degradation aid into the third combination, after the vector scale metering machine 31 in the third combination measures the proportion, and then conveying it to the parallel twin-screw extruder 22; step (S5): adding the biodegradable adjuvant into the fourth combination, after the vector scale metering machine 31 in the fourth combination measures the proportion, and then conveying it to the parallel twin-screw extruder 22; and step (S6): mixing the materials in the parallel twin-screw extruder 22, and then conveying them through the discharge die 23, and after the drying process, finally obtaining the plant fiber-containing biodegradable material of Example 1. Since the discharge die 23 of this embodiment is a strip hole die, the obtained plant fiber-containing biodegradable material is in granular form.

In steps (S1) to (S5), each vector scale meter 31 is started, and its accuracy is 0.1%. In steps (S1) and (S5), the vector scale meter 31 of the material bin barrel 30 used in steps (S1) and (S5) corresponds to and is connected to the feed ports of the two sets of side feeders 25, respectively, so that the plant fiber powder and the biodegradable adjuvant are fed from the side and transported to the parallel twin-screw extruder 22. The parallel twin-screw extruder 22 is divided into 11 temperature zones. In step (S6), the temperatures of the 11 temperature zones of the parallel twin-screw extruder 22 are 100℃-110℃-120℃-130℃-140℃-140℃-135℃-130℃-120℃-120℃-120℃ from left to right.

Based on the total weight of the plant fiber-containing biodegradable material, the plant fiber-containing biodegradable material comprises 40wt% PBAT, 43wt% plant fiber powder, 7wt% degradation aid and 10wt% biodegradation auxiliary agent; wherein the degradation aid comprises a combination of a water-resistant agent, a bulking agent, an antioxidant (product number Everaox®1010), an anti-ultraviolet agent (product number Everaox®168) and a dispersant; the biodegradation auxiliary agent comprises polyhydroxy fatty acid ester. wherein the content of the antioxidant and the anti-ultraviolet agent is 0.5wt% each; the dispersant is a dispersant used for organic synthetic fiber intermediates.

The plant fiber powder of this embodiment is obtained by grinding bamboo or cassava into fine powder with an average particle size of 100 to 2000 meshes. In addition, in other embodiments, the plant fiber powder can also be directly purchased from commercial food-grade cassava powder.

Example 2

The manufacturing method of the plant fiber-containing biodegradable material used in Example 2 is very similar to the manufacturing method of the plant fiber-containing biodegradable material used in Example 1, and the main difference is that the manufacturing equipment of the two is not exactly the same. Specifically, the discharge die head 23 included in the manufacturing equipment and manufacturing method of this embodiment is a flat die head instead of a strip hole die head, and the manufacturing equipment of this embodiment includes a pull tab host machine, but does not include a conveyor belt 40, a cutting machine 50, a vibrating screen inspection machine 60 and a finished product warehouse 70.

Specifically, as shown in FIG. 2 , the manufacturing equipment 1 in the manufacturing method of the plant fiber-containing biodegradable material of this embodiment includes: an electric mixer 10, a granulation host 20, four sets of material bin barrels 30 each equipped with a vector scale metering machine 31 (i.e., the first set to the fourth set) and a pull tab host 80.

Four sets of loading machines 11 are installed on one side of the electric mixer 10, and the raw materials for manufacturing the biodegradable materials containing plant fibers are respectively injected into the material storage barrels 30 as described in the aforementioned steps (S2) to (S5). Among them, the four sets of material storage barrels 30 each equipped with a vector scale metering machine 31 are the first to fourth sets; in each set, each vector scale metering machine 31 is installed at the outlet of each corresponding material storage barrel 30 to measure and proportion the aforementioned raw materials.

The granulation host machine 20 includes a host motor 21, a parallel twin-screw extruder 22 and a discharge die 23. One side (left side) of the parallel twin-screw extruder 22 is connected to the host motor 21, and the other side (right side) of the parallel twin-screw extruder 22 is connected to the discharge die 23. The parallel twin-screw extruder 22 is located downstream of the vector scale metering machine 31 matched with the material storage barrels 30, and is used to receive and mix the raw materials measured and output from the vector scale metering machine 31 of the material storage barrels 30.

Furthermore, the granulation host machine 20 further includes a host machine feed port 24 and two sets of side feeders 25. The vector scale measuring machine 31 in the first combination and the third combination corresponds to and is connected to the host machine feed port 24; the vector scale measuring machine 31 in the second combination and the fourth combination corresponds to and is connected to the feed ports of the two sets of side feeders 25, respectively. Moreover, the host machine feed port 24 and the feed ports of the two sets of side feeders 25 are both connected to the parallel twin-screw extruder 22.

The tab host machine 80 includes a tab device 81 and a film reel 82. The discharge die 23 is connected to one side (left side) of the tab device 81, and the other side (right side) of the tab device 81 is connected to the film reel 82. Since the discharge die 23 of this embodiment is a flat die, the obtained plant fiber-containing biodegradable material is in sheet form.

The plant fiber-containing biodegradable material of the present invention is obtained by grinding plant fiber into powder and adding biodegradable resin carrier and additives, which meets the environmental degradation requirements, and is low-priced, high-quality paper (can be used for paper tableware) or agricultural film. In addition, the present invention does not cut down trees, which can save a lot of wood and protect the natural ecology; and because it does not contain wood pulp, it does not need to add strong acid, strong alkali, bleaching agent and other chemical raw materials in the process, so it does not produce wastewater, waste residue and toxic and harmful gas emissions and other pollution problems. Therefore, the plant fiber-containing biodegradable material produced by the present invention is a green and environmentally friendly product. Furthermore, the fiber paper made from the biodegradable material containing plant fibers of the present invention can be used for straws, lunch boxes, tea cups, coffee cups, etc., which are all non-toxic products that will not harm the health of users; the agricultural film made from the biodegradable material containing plant fibers of the present invention can have dynamic and multi-directional adjustment functions, which can easily meet the temperature, moisture, air permeability and other requirements of various crops with different growth periods, and can be directly turned into the soil after use and wait for it to be degraded into water, carbon dioxide and fertilizer and return to nature, etc., so it can avoid white pollution or soil pollution caused by plastic particles, realize resource recycling, and have good ecological and economic benefits.

The above-mentioned embodiments are only given for the convenience of explanation, but the embodiments are not used to limit the scope of the patent application of the present invention; any other changes, modifications, etc. that do not deviate from the disclosure of the present invention should be included in the scope of the patent covered by the present invention.

1: Manufacturing equipment

10: Electric mixer

11: Loading machine

20: Granulation host machine

21: Main engine motor

22: Parallel twin screw extruder

23: Discharge port die head

24: Main machine unloading port

25: Side feeder

30: Material storage barrel

31: Vector scale measuring machine

40: Conveyor belt

50: Cutting machine

60: Vibration screening machine

70: Finished product warehouse

Claims (9)

A plant fiber-containing biodegradable material, comprising: based on the total weight of the plant fiber-containing biodegradable material, 20 to 45 weight percent of polybutylene adipate-terephthalate; 35 to 60 weight percent of plant fiber powder; 0.5 to 10 weight percent of degradation aid; and 3 to 10 weight percent of biodegradation adjuvant; wherein the raw material of the plant fiber powder comprises bamboo, cassava or a combination thereof; the average particle size of the raw material of the plant fiber powder is 100 to 2000 mesh; the average particle size is defined by D90; the degradation aid comprises a water-resistant agent, a bulking agent, an antioxidant, an anti-ultraviolet agent, a dispersant or a combination thereof; the biodegradation adjuvant comprises polyhydroxy fatty acid ester. As in claim 1, the biodegradable material containing plant fibers is used to manufacture agricultural films or papers. A method for producing a biodegradable material containing plant fibers comprises the following steps: Step (S1): a production device is prepared, the production device comprising an electric mixer, four groups of material storage barrels each equipped with a vector scale metering machine, and a granulation host; wherein a plurality of feeders are arranged on one side of the electric mixer; the four groups of material storage barrels each equipped with a vector scale metering machine are the first group to the fourth group; in each group, the vector scale metering machine is arranged at the outlet of the material storage barrel; the granulation host comprises a host motor, a parallel twin-screw extruder and a discharge die head, one side of the parallel twin-screw extruder is connected to the main motor, and the other side of the parallel twin-screw extruder is connected to the discharge die head; the parallel twin-screw extruder is arranged downstream of the vector scale metering machine of the material bin barrel; step (S2): adding polybutylene adipate-terephthalate-adipate to the first combination, after the vector scale metering machine in the first combination measures the proportion, and then transporting it to the parallel twin-screw extruder; step (S3): preparing plant fiber powder, and adding the plant fiber powder to the second combination, and after the second combination measures the proportion, The vector scale metering machine in the third combination measures the proportion and then transports it to the parallel twin-screw extruder; wherein the raw material of the plant fiber powder comprises bamboo, cassava or a combination thereof; wherein the plant fiber powder is obtained by the following method: grinding the raw material of the plant fiber powder into fine powder with an average particle size of 100 mesh to 2000 mesh to obtain the plant fiber powder; step (S4): adding a degradation agent to the third combination, and after the vector scale metering machine in the third combination measures the proportion, transports it to the parallel twin-screw extruder; wherein the degradation agent comprises a water-resistant agent, A bulking agent, an antioxidant, an anti-ultraviolet agent, a dispersant or a combination thereof; step (S5): adding a biodegradable adjuvant to the fourth combination, after being measured and proportioned by the vector scale meter in the fourth combination, the biodegradable adjuvant is then transported to the parallel twin-screw extruder; wherein the biodegradable adjuvant comprises polybutylene succinate, polyhydroxy fatty acid ester, polylactic acid or a combination thereof; and step (S6): mixing the materials in the parallel twin-screw extruder and then outputting them through the discharge die to obtain the plant fiber-containing biodegradable material as described in claim 1 or 2. The manufacturing method of claim 3, wherein the temperature of the parallel twin-screw extruder in step (S6) is 100°C to 150°C. As in the manufacturing method of claim 4, the parallel twin-screw extruder is divided into 11 temperature zones; in the step (S6), the temperatures of the 11 temperature zones of the parallel twin-screw extruder are 100℃-110℃-120℃-130℃-140℃-140℃-135℃-130℃-120℃-120℃-120℃ in sequence. The manufacturing method as described in claim 3, wherein in the manufacturing equipment, the granulating main machine further comprises a main machine feed port and two sets of side feeders; The main machine feed port is respectively connected to the vector scale measuring machines of the first combination and the third combination, and the main machine feed port is connected to the parallel twin-screw extruder; the feed ports of the two sets of side feeders are respectively connected to the vector scale measuring machines of the second combination and the fourth combination, and the feed ports of the two sets of side feeders are connected to the parallel twin-screw extruder. The manufacturing method as described in claim 3, wherein in the step (S4), the degradation aid is a combination of the water-resistant agent, the bulking agent, the antioxidant, the anti-ultraviolet agent and the dispersant. A manufacturing method as described in any one of claims 3 to 7, wherein the manufacturing equipment further comprises a conveyor belt and a cutter; one end of the conveyor belt is connected to the discharge die; the other end of the conveyor belt is connected to the cutter; wherein the discharge die is a hole die. A manufacturing method as described in any one of claims 3 to 7, wherein the manufacturing equipment further comprises a pull-tab host; the pull-tab host comprises a pull-tab device and a film rolling machine; the discharge die is connected to one side of the pull-tab device, and the other side of the pull-tab device is connected to the film rolling machine; wherein the discharge die is a flat die.

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