TWI862349B - Biodegradable stone paper material and its manufacturing method - Google Patents

Abstract

The present invention provides a biodegradable stone paper material, a manufacturing method thereof and a manufacturing equipment thereof. The biodegradable stone paper material comprises: PBAT within a specific content range, activated calcium carbonate, a degradation aid, a biodegradable carrier and a reinforcing filler. The manufacturing method comprises the following steps: respectively adding the above raw materials into a corresponding combination of a material bin barrel equipped with a vector scale metering machine, then transporting them to a parallel twin-screw extruder, and outputting them through a discharge die after kneading. The manufacturing equipment comprises: an electric high-speed mixer, a plurality of material bin barrels equipped with a vector scale metering machine and a granulation host; the feeder of the electric high-speed mixer injects each raw material into the material bin barrel, each vector scale metering machine performs metering and proportioning on each raw material, and the parallel twin-screw extruder of the granulation host is used to receive and mix each raw material.

Description

Biodegradable stone paper material and its manufacturing method

The present invention relates to the field of paper technology, and in particular to a biodegradable paper material containing stone powder, a manufacturing method thereof, and a manufacturing device thereof.

Traditional paper materials are mostly made from plant fibers such as 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 plant fibers as raw materials requires the use of sulfides to accelerate the decomposition of the 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 packaging material is multi-layer or composite plastic, which has the advantages of light weight, strong plasticity, good mechanical strength, and good barrier properties. However, its recycling after use is very troublesome. Moreover, plastic is not only difficult to decompose, but also often decomposes into plastic particles after disposal, which is also one of the important factors causing soil and environmental pollution.

With the rapid development of science and technology, papermaking technology is also changing with each passing day. It is a degradable stone paper technology that uses the most abundant mineral resources in the earth's crust (such as calcium carbonate) as the main raw material, polymer materials and/or various inorganic substances as auxiliary raw materials, and uses polymer interface chemistry principles and filling modification technology. It is processed through a special process; in short, stone paper is a new type of material between paper and plastic, which can replace some traditional functional papers, professional papers, and most traditional plastic packaging materials. Therefore, stone paper, which does not require cutting down trees and uses inorganic mineral powder and organic resin as its main raw materials, can reduce water consumption and exhaust gas in its production process, and can not only preserve forest resources and reduce production costs, but also reduce secondary pollution generated in the papermaking process. Therefore, it has become one of the new forms of papermaking as environmental sustainability awareness continues to increase. Furthermore, from the perspective of replacing some traditional plastic packaging materials, stone paper has the advantages of being lightweight (compared to other recyclable materials such as metal or glass), biodegradable, and recyclable.

The stone paper currently on the market is mainly made by mixing a large amount of inorganic fillers with organic polymer materials such as polyethylene (PE), polypropylene (PP) and other plastics, and then making them through processes such as calendering or film blowing. However, this kind of stone paper with PE and PP as the base resin is difficult to recycle because the base resin itself is not degradable, resulting in a low actual recycling rate. Therefore, it will still cause white pollution when it is discarded.

In view of the technical defects of the above-mentioned stone paper material, the purpose of the present invention is to provide a biodegradable stone paper material, which can save energy and reduce production costs; in addition, the stone paper can be degraded and returned to nature after disposal, which has the advantage of being environmentally friendly and can achieve sustainable development of resource recycling.

In addition, another purpose of the present invention is to provide a biodegradable stone paper material, the stone paper made from it has the advantages of good mechanical properties and non-flammability.

To achieve the above-mentioned object, the present invention provides a biodegradable stone paper material, which comprises: based on the total weight of the biodegradable stone paper material, 15 weight percentage (weight percentage, wt%) to 35 weight% of polybutylene adipate terephthalate (PBAT); 58 weight% to 70 weight% of activated calcium carbonate; 1 weight% to 10 weight% of a degradation aid; 2 weight% to 10 weight% of a biodegradable carrier; and 2 weight% to 15 weight% of a reinforcing filler. The degradation aid comprises a hardener, a bulking agent, a nucleating agent, a dispersant or a combination thereof; the biodegradable carrier comprises poly(butylene succinate) (PBS), polyhydroxyalkanoates (PHAs), polylactic acid (PLA) or a combination thereof; the reinforcing filler comprises talc, mica, illite powder, bamboo powder or a combination thereof.

The biodegradable stone paper material of the present invention is used to produce new paper with similar functional properties to wood pulp paper by adding more than half of the total weight of mineral raw materials (calcium carbonate) and matching a specific content range of specific degradable base resin (PBAT) and specific materials as additives. The stone paper made from the biodegradable stone paper material of the present invention has both biodegradability and good mechanical properties. It is not only suitable for subsequent diversified applications, such as notebooks, paper bags, food utensils, lunch boxes and packaging materials, but also the waste derived after use can be degraded and returned to nature without specific environmental conditions, which protects the environment and does not harm the health of organisms, which is in line with the trend of sustainable development.

Preferably, based on the total weight of the biodegradable stone paper material, the content of PBAT is 20 wt% to 30 wt%; the content of the active calcium carbonate is 60 wt% to 65 wt%; the content of the degradation aid is 3 wt% to 7 wt%; the content of the biodegradable carrier is 3 wt% to 7 wt%; and the content of the reinforcing filler is 3 wt% to 10 wt%.

The present invention also provides a method for manufacturing biodegradable stone paper materials, which does not require felling trees, making wood pulp, washing with water, or strong acids, strong alkalis, or bleaching agents, and therefore will not cause wastewater discharge or pollute water resources. Moreover, the preparation process is simple and can improve production efficiency.

The manufacturing method of the biodegradable stone paper material comprises the following steps: Step (S1): adding PBAT to the first combination of the material storage barrel equipped with a vector scale metering machine, after the vector scale metering machine in the first combination measures the proportion, and then transports it to the parallel twin-screw extruder; Step (S2): preparing activated calcium carbonate, and adding the activated calcium carbonate to the second combination of the material storage barrel equipped with a vector scale metering machine, after the vector scale metering machine in the second combination measures the proportion, and then transports it to the parallel twin-screw extruder; Step (S3): adding the degradation aid to the third combination of the material storage barrel equipped with a vector scale metering machine, after the vector scale metering machine in the third combination measures the proportion, and then transports it to the parallel twin-screw extruder. After being metered and proportioned by the machine, the materials are then transported to the parallel twin-screw extruder; step (S4): adding the biodegradable carrier to the fourth combination of the material bin barrel equipped with the vector scale metering machine, after being metered and proportioned by the vector scale metering machine in the fourth combination, the materials are then transported to the parallel twin-screw extruder; step (S5): adding the reinforced filler to the fifth combination of the material bin barrel equipped with the vector scale metering machine, after being metered and proportioned by the vector scale metering machine in the fifth combination, the materials are then transported to the parallel twin-screw extruder; and step (S6): mixing the materials in the parallel twin-screw extruder and then outputting them through the discharge port die to obtain the biodegradable stone paper material as described above.

The present invention measures and proportions mineral raw materials, base resin (PBAT, which can be used as the main carrier) and other specific raw materials through a material storage barrel equipped with a vector scale metering machine, and then inputs them into a parallel twin-screw extruder for full mixing and output. 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 stone paper produced can be recycled or degraded in the natural environment, so it will not accumulate waste like plastic products after use, which can be said to meet the main characteristics of environmentally friendly paper.

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 to this.

According to the present invention, the activated calcium carbonate can be prepared using commercially available products or known raw materials. For example, the activated calcium carbonate can be obtained by the following method: grinding the calcium carbonate in the white ore into a fine powder with an average particle size of 1500 to 3000 meshes; then, in order to activate the aforementioned calcium carbonate, the fine powder can be placed in a heated electric high-speed mixer and stirred for 30 to 60 minutes to complete the pre-plasticization activation process to obtain the activated calcium carbonate. Alternatively, the aforementioned fine powder can be activated 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.

According to the present invention, the biodegradable carrier 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. The present invention extracts the base resin PBAT, which can be used as the main carrier. It has low cost and is easy to obtain among degradable materials.

Preferably, the temperature of the parallel twin-screw extruder in the step (S6) is 110°C to 170°C. Specifically, the parallel twin-screw extruder can be divided into 12 temperature zones. In the step (S6), the temperatures of the 12 temperature zones of the parallel twin-screw extruder are 110°C-120°C-130°C-140°C-150°C-160°C-170°C-160°C-150°C-140°C-130°C-130°C in sequence, but not limited thereto.

The present invention also provides a biodegradable stone paper material manufacturing equipment, which includes: an electric high-speed mixer, a plurality of material storage barrels and a granulation host; wherein each of the material storage barrels is equipped with a vector scale metering machine, and the vector scale metering machine is arranged at the outlet of each material storage barrel to measure and proportion each raw material for manufacturing the biodegradable stone paper material; a plurality of feeders are arranged on one side of the electric high-speed mixer to feed the biodegradable stone paper material to the granulation host; The raw materials of paper materials are respectively injected into the material storage barrels; the granulation main machine includes a main machine motor, a parallel twin-screw extruder and a discharge die head, one side of the parallel twin-screw extruder is connected to the main machine 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 storage barrels, and is used to receive and mix the raw materials output from the vector scale metering machine of the material storage barrels.

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 measuring machine of the material bin barrels and the parallel twin-screw extruder; the feed port of the at least one side feeder is connected to the vector scale measuring machine of one of the remaining parts of the material bin barrels, and the feed port of the at least one side feeder is connected to the parallel twin-screw extruder.

Preferably, each of the silo barrels is equipped with a vector scale measuring machine, which is located between each silo barrel and the feed port of the host machine, or between the feed port of at least one side feeder. Preferably, the accuracy of each vector scale measuring machine is 0.1%, but not limited to this.

For example, the manufacturing equipment of the biodegradable stone paper material has five sets of the feeders and corresponding five sets of the material bin barrels and vector scale metering machine combinations, which respectively correspond to the PBAT, activated calcium carbonate, degradation aid, biodegradable carrier and reinforced filler being measured and transported to the parallel twin-screw extruder through the vector scale metering machine. Furthermore, in some embodiments, the vector scale metering machines of three sets of material bin barrels are connected to the feed port of the host machine, and the vector scale metering machines of the remaining two sets of material bin barrels are respectively connected to two sets of side feeders. For example, the aforementioned side feeder can be responsible for transporting activated calcium carbonate and reinforced filler, but is not limited to this.

Preferably, the discharge die head can be equipped with a vector scale measuring machine. In some embodiments, the discharge die head can be a strip hole die head or a flat die head, but is not limited thereto. When the discharge die head is a strip hole die head, the biodegradable stone paper material produced is in the form of particles; when the discharge die head is a flat die head, the biodegradable stone paper material produced is in the form of sheets.

In some embodiments, the manufacturing equipment of the biodegradable stone paper material may further include 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 strip hole die. Preferably, the manufacturing equipment of the biodegradable stone paper material may further include a vibrating screening machine and a finished product bin; wherein the other side of the cutter (relative to one side of the discharge die) 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 bin.

In other embodiments, the manufacturing equipment of the biodegradable stone paper material further includes 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.

More than 50 wt% of the carbon in the biodegradable stone paper material of the present invention comes from nature and is a circular degradable material. In addition, the biodegradable stone paper material of the present invention does not contain eight heavy metals; does not contain 6P plastics (PE, PP, PVC, PS, PET, PC) and EVA, etc.; and when the stone paper produced by the present invention is disposed of by landfill after disposal, 50% of carbon dioxide emissions can be reduced. Furthermore, the raw material source can be food-grade raw materials (non-toxic and heavy metal-free), so it is very suitable to be used in food packaging. In addition, the stone paper produced by the present invention can be directly degraded in the natural environment without having to be degraded in a special environment, and no toxic gas will be produced during the degradation process; in addition, if under composting conditions, the stone paper produced by the present invention can be decomposed into carbon dioxide, water and organic fertilizer by microorganisms within 180 days. In short, the stone paper produced by the present invention is not only biodegradable but also compostable, which can effectively combat white pollution. In addition, the biodegradable stone paper material is an emerging granular material that has a wide range of applications in life. Through known injection molding, blister molding, pull-tab and other processes, it can be first made into a paper roll and then used as paper. It can be especially used in the packaging of lunch boxes, drink cups, and straws, and can basically replace traditional paper raw materials. In addition, the manufacturing method of the present invention will not produce serious pollution during the manufacturing process, or the manufacturing equipment of the present invention will not produce serious pollution during implementation, and has the advantages of saving energy, reducing carbon emissions, and protecting the natural environment.

1: Manufacturing equipment for biodegradable stone paper materials

10: Electric high-speed 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 of the biodegradable stone paper material of Example 1.

Figure 2 is a schematic diagram of the manufacturing equipment of the biodegradable stone paper material of Example 4.

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 rather than 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

Please refer to Figure 1, the biodegradable stone paper material manufacturing equipment 1 of this embodiment can be used in conjunction with the biodegradable stone paper material manufacturing method of the present invention to produce the biodegradable stone paper material of the present invention.

The manufacturing equipment 1 of the biodegradable stone paper material of this embodiment comprises an electric high-speed mixer 10, a granulating main machine 20, a combination of 5 sets of material bin barrels 30 each equipped with a vector scale metering machine 31, a conveyor belt 40, a material cutter 50, a vibrating screen inspection machine 60, and a finished product bin 70. Five sets of loading machines 11 are arranged on one side of the electric high-speed mixer 10, and the raw materials for manufacturing the biodegradable stone paper material are respectively injected into the material bin barrels 30 as described in the following steps (S1) to (S5). Among them, each vector scale metering machine 31 is arranged at the outlet of each corresponding material bin barrel 30 to measure and proportion the raw materials for manufacturing the biodegradable stone paper material. The granulation host machine 20 includes a host motor 21, a parallel twin-screw extruder 22 and a discharge die 23. The left side of the parallel twin-screw extruder 22 is connected to the host motor 21, and the 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 of the material storage barrel 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 barrel 30.

Furthermore, the granulation host 20 further includes a host feed port 24 and two sets of side feeders 25. The vector scale weighing machines 31 of the three material bin barrels 30 correspond to and are connected to the host feed port 24, and the vector scale weighing machines 31 of each of the three material bin barrels 30 are located between the material bin barrel 30 and the host feed port 24; the vector scale weighing machines 31 of the other two sets of material bin barrels 30 correspond to and are connected to the feed ports of the two sets of side feeders 25, and the vector scale weighing machines 31 of the two sets of material bin barrels 30 are located between the material bin barrels 30 and the feed ports of the two sets of side feeders 25. Furthermore, the main 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.

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.

The manufacturing method of the biodegradable stone paper material of the present embodiment comprises the following steps: Step (S1): adding PBAT to the first combination of the material storage barrel 30 equipped with the vector scale metering machine 31, after the vector scale metering machine 31 in the first combination measures the proportion, and then transports it to the parallel twin-screw extruder 22; Step (S2): preparing activated calcium carbonate, and adding the activated calcium carbonate to the second combination of the material storage barrel 30 equipped with the vector scale metering machine 31, after the vector scale metering machine 31 in the second combination measures the proportion, and then transports it to the parallel twin-screw extruder 22; Step (S3): adding the degradation aid to the third combination of the material storage barrel 30 equipped with the vector scale metering machine 31, after the vector scale metering machine 31 in the third combination measures the proportion, and then transports it to the parallel twin-screw extruder 22. After the proportion is measured, the mixture is transported to the parallel twin-screw extruder 22; Step (S4): the biodegradable carrier is added to the fourth combination of the material bin barrel 30 equipped with the vector scale metering machine 31, and after the proportion is measured by the vector scale metering machine 31 in the fourth combination, the mixture is transported to the parallel twin-screw extruder 22; Step (S5): the reinforced filler is added to the material bin barrel 30 equipped with the vector scale metering machine 31, and the reinforced filler is transported to the parallel twin-screw extruder 22; Step (S6): the reinforced filler is added to the material bin barrel 30 equipped with the vector scale metering machine 31, and the reinforced filler is transported to the parallel twin-screw extruder 22; Step (S7): the reinforced filler is added to the material bin barrel 30 equipped with the vector scale metering machine 31, and the reinforced filler is transported to the parallel twin-screw extruder 22; Step (S8): the reinforced filler is added to the material bin barrel 30 equipped with the vector scale metering machine 31, and the reinforced filler is transported to the parallel twin-screw extruder 22; Step (S9): the reinforced filler is added to the material bin barrel 30 equipped with the vector scale metering machine 31, and the reinforced filler is transported to the parallel twin-screw extruder 22; Step (S10): the reinforced filler is added to the material bin barrel 30 equipped with the vector scale metering machine 31, and the reinforced filler is transported to the parallel twin-screw extruder 22; Step (S11): the reinforced filler is added to the material bin barrel 30 equipped with the vector scale metering machine 31, and the reinforced filler is transported to the parallel twin-screw extruder 22; Step (S12): the reinforced filler is added The material is then transported to the parallel twin-screw extruder 22 after being weighed by the vector scale metering machine 31 in the fifth combination of the material storage barrel 30 of the machine 31; and step (S6): the material in the parallel twin-screw extruder 22 is mixed and then output through the discharge die 23, and after the drying process, the biodegradable stone paper material of Example 1 is finally obtained. Since the discharge die 23 of this embodiment is a strip hole die, the biodegradable stone paper material obtained is in granular form.

In steps (S1) to (S5), each vector scale meter 31 is started, and its accuracy is 0.1%. In steps (S2) and (S5), the vector scale meter 31 of the material bin barrel 30 used is respectively corresponding to and connected with the feed ports of the two sets of side feeders 25, so that the activated calcium carbonate and the reinforced filler are fed from the side and transported to the parallel twin-screw extruder 22. The parallel twin-screw extruder 22 is divided into 12 temperature zones. In step (S6), the temperatures of the 12 temperature zones of the parallel twin-screw extruder 22 are 110℃-120℃-130℃-140℃-150℃-160℃-170℃-160℃-150℃-140℃-130℃-130℃ from left to right.

Based on the total weight of the biodegradable stone paper material, the biodegradable stone paper material comprises 25 wt% of polybutylene adipate-terephthalate, 60 wt% of active calcium carbonate, 5 wt% of a degradation aid, 5 wt% of a biodegradable carrier and 5 wt% of a reinforcing filler; wherein the degradation aid comprises a hardener, a bulking agent, a nucleating agent and a dispersant; the biodegradable carrier comprises polyhydroxy fatty acid ester; and the reinforcing filler comprises bamboo powder.

Among them, the activated calcium carbonate of this embodiment is obtained by grinding calcium carbonate in white ore into fine powder with an average particle size of 1500 mesh; then the fine powder is placed in a heated electric high-speed mixer 10 and stirred for 30 minutes to complete the pre-plasticization activation process to obtain the activated calcium carbonate. In addition, in other embodiments, the activated calcium carbonate can also be obtained from fine powder with an average particle size of 1500 mesh through other activation processes, or directly purchased from commercially available activated calcium carbonate.

Example 2

The manufacturing equipment of the biodegradable stone paper material used in Example 2 is the same as the manufacturing equipment 1 of the biodegradable stone paper material used in Example 1, and the manufacturing method of the biodegradable stone paper material in Example 2 is similar to the manufacturing method of the biodegradable stone paper material in Example 1. The difference lies mainly in that the preparation method of the activated calcium carbonate used in step (S2) of Example 2 is slightly different; that is, the activated calcium carbonate in this example is to grind the calcium carbonate in the white ore into a fine powder with an average particle size of 2500 mesh; then the fine powder is placed in a heated electric high-speed mixer 10 and stirred for 50 minutes to complete the pre-plasticization activation process to obtain the activated calcium carbonate.

Implementation Example 3

The manufacturing equipment of the biodegradable stone paper material used in Example 3 is the same as the manufacturing equipment 1 of the biodegradable stone paper material used in Example 1, and the manufacturing method of the biodegradable stone paper material in Example 3 is similar to the manufacturing method of the biodegradable stone paper material in Example 1. The difference lies mainly in that the preparation method of the activated calcium carbonate used in step (S2) of Example 3 is slightly different; that is, the activated calcium carbonate in this example is to grind the calcium carbonate in the white ore into a fine powder with an average particle size of 3000 mesh; then the fine powder is placed in a heated electric high-speed mixer 10 and stirred for 60 minutes to complete the pre-plasticization activation process to obtain the activated calcium carbonate.

Example 4

The manufacturing equipment and manufacturing method of the biodegradable stone paper material used in Example 4 are similar to the manufacturing equipment 1 and manufacturing method of the biodegradable stone paper material used in Example 1, with the main differences being: the discharge port die 23 included in the manufacturing equipment and manufacturing method of this embodiment is a flat die instead of a strip hole die, and the manufacturing equipment of this embodiment includes a pull tab host machine, but does not include a conveyor belt 40, a material cutter 50, a vibrating screen inspection machine 60, and a finished product warehouse 70.

Specifically, as shown in FIG. 2 , the manufacturing equipment 1 of the biodegradable stone paper material of the present embodiment 4 comprises an electric high-speed mixer 10, a granulation host 20, a combination of 5 sets of material bin barrels 30 each equipped with a vector scale metering machine 31, and a pull-tab host 80. Five sets of loading machines 11 are arranged on one side of the electric high-speed mixer 10, and the raw materials for manufacturing the biodegradable stone paper material are respectively injected into the material bin barrels 30 as described in the aforementioned steps (S1) to (S5). Among them, each vector scale metering machine 31 is arranged at the outlet of each corresponding material bin barrel 30 to measure and proportion the raw materials for manufacturing the biodegradable stone paper material. The granulation host machine 20 includes a host motor 21, a parallel twin-screw extruder 22 and a discharge die 23. The left side of the parallel twin-screw extruder 22 is connected to the host motor 21, and the 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 of the material storage barrel 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 barrel 30.

Furthermore, the granulation host 20 further includes a host feed port 24 and two sets of side feeders 25. Among them, the vector scale weighing machines 31 of the three material bin barrels 30 correspond to and are connected to the host feed port 24, and the vector scale weighing machines 31 of each of the three material bin barrels 30 are located between the material bin barrel 30 and the host feed port 24; the vector scale weighing machines 31 of the other two sets of material bin barrels 30 correspond to and are connected to the feed ports of the two sets of side feeders 25, and the vector scale weighing machines 31 of the two sets of material bin barrels 30 are located between the material bin barrels 30 and the feed ports of the two sets of side feeders 25. Furthermore, the main 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 biodegradable stone paper material produced is in sheet form.

The biodegradable stone paper material of the present invention is made by grinding stone minerals into powder and adding biodegradable resin carriers and additives, and the main component is more than 60% of the mineral (stone powder). In particular, the aforementioned mineral can be selected from calcium carbonate in white stone, and then combined with PBAT, etc. to carry out the processes of compatible mixing of various raw materials, granulation, drawing into sheets, paper rolls, etc., and successfully developed a low-cost, high-quality paper material that meets the requirements of environmental degradation, so it can replace the current high-end and high-priced paper products. In addition, the present invention does not use plant fibers or cut down trees, which can save a lot of wood and protect the natural ecology. Since it does not contain wood pulp, it is not necessary to add chemical raw materials such as strong acid, strong alkali, and bleaching agent in the process, so it does not produce wastewater, waste residue, and toxic and harmful gas emissions. Pollution problems, so the biodegradable stone paper material produced by the present invention is a green environmentally friendly product. Furthermore, the stone paper produced by the biodegradable stone paper material of the present invention has the advantages of good mechanical properties, waterproof, moisture-proof, moth-proof, folding-resistant, tear-resistant, oil-resistant, non-toxic, odorless, pollution-free, stable geometric dimensions, high printing clarity, good effect, etc., and can be naturally degraded into water and carbon dioxide after disposal and returned to nature, so it can achieve a low-consumption, low-emission, and high-efficiency circular economic model. Accordingly, the stone paper made from the biodegradable stone paper material of the present invention is very suitable for application in various daily necessities such as food packaging, paper boxes, bags, cards, tags, notebooks, loose-leaf paper, calendars, desk calendars, posters, books, etc.

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 for biodegradable stone paper materials

10: Electric high-speed 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 (5)

A biodegradable stone paper material, comprising: based on the total weight of the biodegradable stone paper material, 15 to 35 weight percent of poly (butylene adipate-terephthalate); 58 to 70 weight percent of active calcium carbonate; 1 to 10 weight percent of a degradation aid; 2 to 10 weight percent of a biodegradable carrier; and 2 to 15 weight percent of a wherein the active calcium carbonate is prepared by pre-plasticizing and activating calcium carbonate fine powder having an average particle size of less than or equal to 1500 mesh and less than 2500 mesh; the degradation aid comprises a hardener, a bulking agent, a nucleating agent, a dispersant or a combination thereof; the biodegradable carrier comprises polybutylene succinate, polyhydroxy fatty acid ester, polylactic acid or a combination thereof; the reinforcing filler comprises talc, mica, illite powder, bamboo powder or a combination thereof. A method for producing biodegradable stone paper material comprises the following steps: Step (S1): adding polybutylene adipate-terephthalate-butylene adipate into a first combination of a material storage barrel equipped with a vector scale metering machine, and then conveying it to a parallel twin-screw extruder after the vector scale metering machine in the first combination measures the proportion; Step (S2): preparing activated calcium carbonate and mixing the activated calcium carbonate into a Calcium is added to the second combination of the material bin barrel equipped with a vector scale metering machine, and after being measured and proportioned by the vector scale metering machine in the second combination, it is transported to the parallel twin-screw extruder; wherein the activated calcium carbonate is prepared by pre-plasticization activation process of calcium carbonate fine powder with an average particle size of less than or equal to 1500 mesh and less than 2500 mesh; Step (S3): Add the degradation aid to the second combination of the material bin barrel equipped with a vector scale metering machine, and then transport it to the parallel twin-screw extruder; wherein the activated calcium carbonate is prepared by pre-plasticization activation process of calcium carbonate fine powder with an average particle size of less than or equal to 1500 mesh and less than 2500 mesh; Step (S3): Add the degradation aid to the second combination of the material bin barrel equipped with a vector scale metering machine The biodegradable carrier is added into the third combination of the material bin barrel of the weighing machine, and after being weighed and proportioned by the vector weighing machine in the third combination, it is then transported to the parallel twin-screw extruder; Step (S4): adding the biodegradable carrier into the fourth combination of the material bin barrel equipped with the vector weighing machine, and after being weighed and proportioned by the vector weighing machine in the fourth combination, it is then transported to the parallel twin-screw extruder; Step (S 5): Add the reinforced filler into the fifth combination of the material storage barrel equipped with a vector scale metering machine, and after being measured and proportioned by the vector scale metering machine in the fifth combination, it is transported to the parallel twin-screw extruder; and step (S6): Mix the materials in the parallel twin-screw extruder and then output them through the discharge die to obtain the biodegradable stone paper material as described in claim 1. The manufacturing method of claim 2, wherein the temperature of the parallel twin-screw extruder in step (S6) is 110°C to 170°C. As in the manufacturing method of claim 3, wherein the parallel twin-screw extruder is divided into 12 temperature zones; in the step (S6), the temperatures of the 12 temperature zones of the parallel twin-screw extruder are 110℃-120℃-130℃-140℃-150℃-160℃-170℃-160℃-150℃-140℃-130℃-130℃ in sequence. The manufacturing method of any one of claims 2 to 4, wherein the activated calcium carbonate in step (S2) is obtained by the following method: grinding the calcium carbonate in the white ore into a fine powder with an average particle size of less than or equal to 1500 mesh and less than 2500 mesh; then placing the fine powder in a heated electric high-speed mixer and stirring for 30 minutes to 60 minutes to complete the pre-plasticization activation process to obtain the activated calcium carbonate.

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