A bio-based high-barrier, water and oil repellent paper-based packaging material and a method for its preparation

Abstract

This invention discloses a bio-based high-barrier, waterproof, and oil-resistant paper-based packaging material and its preparation method, belonging to the field of packaging material technology. This invention uses bio-based green and environmentally friendly materials such as natural latex or epoxidized natural latex and nanocellulose to prepare a coating. Further, metal ions are used to ion-crosslink the coating to obtain a crosslinked coating layer. Natural rubber or epoxidized natural rubber provides good water resistance; nanocellulose provides excellent gas and oil resistance; and ion crosslinking further enhances the barrier properties of the coating, thus producing a high-barrier, waterproof, and oil-resistant paper-based packaging material. The raw materials of the high-barrier, waterproof, and oil-resistant paper-based packaging material provided by this invention are all derived from bio-based materials, are biodegradable, do not pollute the environment, and have a simple manufacturing method, making them suitable for large-scale industrial applications.

Description

Technical Field

[0001] This invention relates to a packaging material, and more particularly to a bio-based high-barrier, waterproof and oil-resistant paper-based packaging material and its preparation method, belonging to the field of packaging material technology. Background Technology

[0002] The concept of "replacing plastic with paper" for sustainable development has received more attention. However, paper has poor barrier properties and water resistance, especially its performance deteriorates rapidly in high humidity environments. Therefore, it is usually necessary to surface-coat it or combine it with other materials to improve its barrier properties, water and oil resistance, and thus meet the needs of high-barrier applications.

[0003] To avoid compromising the bio-based and biodegradable properties of paper packaging, the use of bio-based and biodegradable materials in coating preparation is currently a key focus of research and attention in related fields. Natural latex or epoxidized natural rubber are bio-based renewable polymers derived from plants. As a non-polar material, they have wide applications in waterproof coatings and adhesives. However, natural rubber has poor gas barrier properties, making it unsuitable for use alone as a coating for paper-based packaging materials. Cellulose is one of the most abundant biomass materials known on Earth, with wide availability, and is renewable and biodegradable. Nanocellulose extracted from cellulose is a novel nanomaterial with excellent mechanical properties and biocompatibility. Furthermore, due to the strong hydrogen bonding between nanocellulose molecules, nanocellulose membranes exhibit excellent gas barrier properties, thus showing broad application prospects in advanced functional materials and food packaging. However, due to its hydrophilic nature, nanocellulose has poor water barrier properties, and its various properties decline sharply under high humidity conditions. In addition, existing technologies require screening and filtering of raw materials, as well as crushing to prevent internal particles from becoming unbreakable. To address these issues, a bio-based high-barrier, waterproof and oil-resistant paper-based packaging material and its preparation method are designed. Summary of the Invention

[0004] The main objective of this invention is to provide a bio-based high-barrier, waterproof and oil-resistant paper-based packaging material and its preparation method.

[0005] The objective of this invention can be achieved by adopting the following technical solution:

[0006] A bio-based high-barrier, waterproof and oil-resistant paper-based packaging material, comprising base paper and a high-barrier, waterproof and oil-resistant coating;

[0007] The high-barrier waterproof and oil-resistant coating comprises the following raw materials in parts by weight: 100 parts natural rubber or epoxidized natural rubber, 5-60 parts nanocellulose, and 0.5-20 parts ion crosslinking agent.

[0008] Preferably, the natural rubber or epoxidized natural rubber is derived from latex, with a solid content of 15-60%, and the epoxidation degree of the epoxidized natural rubber is 10-50%.

[0009] The nanocellulose is one or both of cellulose nanocrystals and cellulose nanofibers;

[0010] The ionic crosslinking agent is one or more of ferric chloride, calcium chloride, and zinc chloride.

[0011] A method for preparing a bio-based high-barrier, waterproof, and oil-resistant paper-based packaging material, characterized in that:

[0012] The preparation steps include the following:

[0013] S1. Add the nanocellulose dispersion to natural latex or epoxidized natural latex, mechanically stir and then use ultrasonic dispersion to make the nanocellulose and rubber latex evenly mixed;

[0014] S2. Dissolve 0.5-20 parts of ionic crosslinking agent in water, add dropwise to the mixed dispersion obtained in S1 and disperse evenly to obtain a bio-based high-barrier waterproof and oil-proof coating;

[0015] S3. The bio-based high-barrier, waterproof and oil-proof coating obtained in S2 is uniformly coated on the surface of kraft paper, and after drying, the bio-based high-barrier, waterproof and oil-proof paper-based packaging material is obtained.

[0016] Preferably, the amount of nanocellulose used is 10-50% of the rubber mass;

[0017] The coating process is one or more of dip coating, scraping coating, or spraying.

[0018] Preferably, in S1, an automatic dosing device is used when adding natural latex or epoxidized natural latex. This automatic dosing device includes a protective shell at the upper end of the weighing device, a connecting plate slidably connected to the inner front side of the protective shell, a storage tank fixedly connected to the upper end of the protective shell, a storage cover movably connected to the upper end of the storage tank, a first drain channel fixedly connected to the lower end of the storage tank, a first crushing block movably connected to the inner side of the first drain channel, a second drain channel fixedly connected to the lower end of the first drain channel, a second crushing block movably connected to the inner side of the second drain channel, a diversion channel fixedly connected below the second drain channel, a first diversion port at the lower end of the diversion channel, a first locking tooth at the lower end of the connecting plate, a baffle plate movably connected to the first locking tooth, a second baffle plate above the first baffle plate, the second baffle plate sliding at the lower end of the storage tank, and the first baffle plate sliding at the lower end of the diversion channel.

[0019] Preferably, two sets of first movable blocks are fixedly connected to the outside of the storage tank, and a second movable block is movably connected between the two sets of first movable blocks via a rotating shaft. One end of the second movable block is fixedly connected to the storage cover, and a handle is fixedly connected to the upper end of the storage cover.

[0020] A second support plate is provided on one side of the storage tank. A first diversion plate with a certain inclination angle is fixedly connected to the lower end of the storage tank. The first diversion plate is fixedly connected to the first leakage channel. A first support plate is provided on one side of the first leakage channel. A second diversion plate with a certain inclination angle is fixedly connected to the lower end of the first leakage channel. The second diversion plate is fixedly connected to the second leakage channel. The hole on the second leakage channel is smaller than the hole on the first leakage channel.

[0021] Preferably, both the second support plate and the first support plate are fixedly connected to the protective shell. A limiting groove is formed on the inner side of the front end of the protective shell. The first connecting plate slides in the limiting groove. A first connecting rope and a second connecting rope are fixedly connected to the upper end of the first connecting plate. A handle is fixedly connected to the front end of the first connecting plate. A connecting block is fixedly connected to the rear end of the first connecting plate. The connecting block is fixedly connected to the first locking tooth. The first connecting plate is L-shaped.

[0022] The first connecting rope passes through the upper side of the second support plate and is fixedly connected to the first crushing block. The second connecting rope passes through the upper side of the first support plate and is fixedly connected to the second crushing block. The first crushing block is adapted to the first trough, and the second crushing block is adapted to the second trough.

[0023] Preferably, a first sliding groove is provided on the outer side of the front end of the protective shell, and a second sliding groove is provided on the inner wall of the front end of the protective shell. The handle slides inside the first sliding groove, and the connecting block is slidably connected to the second sliding groove.

[0024] A fixing plate is fixedly connected between one side of the protective shell and the drainage channel. Rotating rod one and rotating rod two are rotatably connected to the fixing plate. The fixing plate is L-shaped.

[0025] A first gear is engaged on one side of the first locking tooth. The first gear is fixedly connected to a rotating rod. A second gear is fixedly connected to one end of the rotating rod through a fixing plate. A third gear is engaged at the lower end of the second gear. The third gear is fixedly connected to a rotating rod. A fourth gear is fixedly connected to one end of the rotating rod through a fixing plate. A second locking tooth is engaged on one side of the fourth gear. The second locking tooth is fixedly connected to a baffle.

[0026] Preferably, a connecting plate 2 is fixedly connected to one side of the second locking tooth and the first baffle. The connecting plate 2 is fixedly connected to the second baffle. A third sliding groove and a fourth sliding groove are provided on the inner wall of the rear end of the protective shell. The second baffle slides inside the third sliding groove, and the second locking tooth and the first baffle slide inside the fourth sliding groove. A limiting groove 2 is provided on the inner side of the rear end of the protective shell, and the connecting plate 2 slides inside the limiting groove 2.

[0027] The baffle is provided with a second drainage port, which is the same size as the first drainage port.

[0028] Beneficial technical effects of the present invention:

[0029] This invention provides a bio-based high-barrier, waterproof, and oil-resistant paper-based packaging material and its preparation method. By grasping and pulling the handle downwards, the handle causes the connecting plate to slide downwards. Simultaneously, the connecting plate pulls out the first and second crushing blocks from the first and second drainage channels, respectively. The downward movement of the connecting plate also causes the first locking tooth to move downwards, meshing with the first gear and rotating it. The first gear is fixedly connected to the second gear, allowing the second gear to rotate as well. The second gear meshes with the third gear, causing it to rotate. The third gear is fixedly connected to the fourth gear, causing the fourth gear to rotate as well. The fourth gear, through meshing, moves the second locking tooth, moving the second inlet on the fixedly connected baffle to below the first inlet. Simultaneously, the baffle moves from below the storage tank, allowing the raw materials stored in the storage tank to flow into the first drainage channel along the first inlet plate. Releasing the handle causes the first crushing block to fall into the first drainage channel due to its own weight. Simultaneously, the connecting plate 1 is moved upwards, and the first locking tooth fixedly connected to the connecting plate 1 also moves upwards, causing the baffle 2 to move back below the storage tank and block it, preventing the raw material from flowing out. The first crushing block falls into the first trough, crushing the raw material in the first trough. Pulling the handle 1 downwards again, the crushed raw material falls from the hole along the second guide plate into the second trough. Releasing the handle 1, the second crushing block falls into the second trough due to its gravity, crushing the raw material again, and the crushed raw material flows out from the hole. The material gathers in the drainage trough and flows into the container when the first and second drainage ports are aligned. When not in use, the second drainage port will move away from below the first drainage port, and the baffle will block the first drainage port to prevent the material from flowing out, keeping the material in a sealed space to avoid contamination. The first and second crushing blocks can crush the material, making it convenient to use and preventing clumping. The weighing device can weigh the material. This process is repeated until the required weight of material is taken out.

[0030] The raw materials used in this invention are all bio-based, renewable, and biodegradable. No organic solvents are used in the entire process, making it environmentally friendly and highly safe to use.

[0031] This invention leverages the synergistic effect of the water-blocking properties of bio-based rubber and the gas-blocking properties of nanocellulose, further enhancing the overall performance of the coating through cross-linking, thereby achieving the preparation of high-barrier, waterproof, and oil-resistant paper-based packaging materials. Simultaneously, the bio-based latex in the coating also acts as an adhesive, avoiding the need for bonding processes and reducing production costs.

[0032] This invention employs a simple physical mixing process, and the preparation method is simple, efficient, practical, and easy to promote. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 This is a partial structural cross-sectional view of the present invention;

[0035] Figure 3 This is a partial structural cross-sectional view of the present invention;

[0036] Figure 4 This is a partial structural cross-sectional view of the present invention;

[0037] Figure 5 This is a partial structural schematic diagram of the present invention;

[0038] Figure 6 This is a partial structural cross-sectional view of the present invention;

[0039] Figure 7 This is a partial structural schematic diagram of the present invention;

[0040] Figure 8 This is an enlarged structural diagram of part A of the present invention;

[0041] Figure 9 This is an enlarged structural diagram of part B of the present invention;

[0042] Figure 10 Scanning electron microscope (SEM) images of the surfaces of Examples 1 and 2;

[0043] Figure 11 Scanning electron microscope (SEM) images of the surfaces of Examples 3 and 4;

[0044] Figure 12 This is a scanning electron microscope image of the surface of Comparative Example 1;

[0045] Figure 13 The oil resistance properties of the base paper, Comparative Example 1, and different embodiments are shown.

[0046] In the diagram: 1. Weighing device; 2. Protective shell; 3. First slide groove; 4. Storage tank; 5. Storage cover; 6. First diversion plate; 7. First leakage groove; 8. Support plate one; 9. Second diversion plate; 10. Second leakage groove; 11. Diversion groove; 12. First diversion port; 13. Support plate two; 14. Limiting groove one; 15. Connecting plate one; 16. Handle one; 17. Second slide groove; 18. Connecting block; 19. First locking tooth; 20. Rotating rod one; 21. First gear; 22. 23. Second gear; 24. Third gear; 25. Rotating rod 2; 26. Fourth gear; 27. Second locking tooth; 28. First baffle; 29. ​​Second drain port; 30. Second connecting plate; 31. Second connecting rope; 32. Second connecting rope; 33. First crushing block; 34. Second crushing block; 35. Third slide groove; 36. Fourth slide groove; 37. Fixed plate; 38. Second limiting groove; 39. Second handle; 40. First movable block; 41. Second movable block. Detailed Implementation

[0047] To enable those skilled in the art to understand the technical solution of the present invention more clearly, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0048] Raw material information used in the examples and comparative examples:

[0049] Cellulose nanofibers (CNC): purchased from Qihong Technology, with a diameter of 4-10nm, a length of 100-500nm, and a solid content of 4%; Cellulose nanofibers (CNF): purchased from Qihong Technology, with a diameter of 4-10nm, a length of 1-3µm, and a solid content of 1%.

[0050] Epoxidized natural latex: Commercially available, with epoxidation degrees of 24%, 30%, and 40% (abbreviated as ENR-24, ENR-30, and ENR-40 respectively), and a solids content of 20%.

[0051] Ferric chloride hexahydrate (FeCl3·6H2O): analytical grade, purchased from Fuchen Chemical Reagent Co., Ltd.

[0052] Kraft paper: Provided by the laboratory, 80g / m² 2 .

[0053] Specific experimental steps or conditions not specified in the embodiments can be performed according to conventional operations or conditions described in the literature in this field. All raw materials or instruments used are commercially available conventional products, including but not limited to those used in the embodiments of this application.

[0054] Example 1

[0055] This embodiment provides a bio-based high-barrier, waterproof and oil-resistant paper-based packaging material and its preparation method, including the following steps:

[0056] S1. Weigh 50g of ENR-40 with a solid content of 20%, and slowly add 75g of CNC with a solid content of 4% (equivalent to 30% of the mass of ENR) under mechanical stirring. Continue stirring for 1 hour to achieve uniform dispersion.

[0057] S2. Weigh 0.1g of FeCl3·6H2O, dissolve it in 10mL of water, and slowly add it to the composite emulsion prepared in step S1 with continuous stirring using a dropper. Continue stirring for 30 minutes, and then place it at 50 degrees Celsius to evaporate the water while stirring, so that the final solid content in the mixed dispersion is 10%. Finally, ultrasonically disperse for 30 minutes and remove bubbles to obtain a uniformly dispersed bio-based high barrier coating.

[0058] S3. Apply the bio-based high-barrier coating obtained in S2 evenly to the surface of kraft paper using a scraping method, ensuring the coating thickness remains consistent. After drying, apply the coating again. Repeat this step 5 times to obtain the bio-based high-barrier, waterproof and oil-proof paper-based packaging material.

[0059] Example 2

[0060] This embodiment provides a bio-based high-barrier, waterproof and oil-resistant paper-based packaging material and its preparation method, including the following steps:

[0061] S1. Weigh 50g of ENR-40 with a solid content of 20%, and slowly add 75g of CNC with a solid content of 4% (equivalent to 30% of the mass of ENR) under mechanical stirring. Continue stirring for 1 hour to achieve uniform dispersion.

[0062] S2. Weigh 0.3g of FeCl3·6H2O, dissolve it in 10mL of water, and slowly add it to the composite emulsion prepared in step S1 with continuous stirring using a dropper. Continue stirring for 30 minutes, and then place it at 50 degrees Celsius to evaporate the water while stirring, so that the final solid content in the mixed dispersion is 10%. Finally, ultrasonically disperse for 30 minutes and remove bubbles to obtain a uniformly dispersed bio-based high-barrier coating.

[0063] S3. Apply the bio-based high-barrier coating obtained in S2 evenly to the surface of kraft paper using a scraping method, ensuring the coating thickness remains consistent. After drying, apply the coating again. Repeat this step 5 times to obtain the bio-based high-barrier, waterproof and oil-proof paper-based packaging material.

[0064] Example 3

[0065] This embodiment provides a bio-based high-barrier, waterproof and oil-resistant paper-based packaging material and its preparation method, including the following steps:

[0066] S1. Weigh 50g of ENR-40 with a solid content of 20%, and slowly add 25g of CNC with a solid content of 4% (equivalent to 10% of the mass of ENR) under mechanical stirring. Continue stirring for 1 hour to achieve uniform dispersion.

[0067] S2. Weigh 0.1g of FeCl3·6H2O, dissolve it in 10mL of water, and slowly add it to the composite emulsion prepared in step S1 with continuous stirring using a dropper. Continue stirring for 30 minutes, and then place it at 50 degrees Celsius to evaporate the water while stirring, so that the final solid content in the mixed dispersion is 10%. Finally, ultrasonically disperse for 30 minutes and remove bubbles to obtain a uniformly dispersed bio-based high barrier coating.

[0068] S3. Apply the bio-based high-barrier coating obtained in S2 evenly to the surface of kraft paper using a scraping method, ensuring the coating thickness remains consistent. After drying, apply the coating again. Repeat this step 5 times to obtain the bio-based high-barrier, waterproof and oil-proof paper-based packaging material.

[0069] Example 4

[0070] This embodiment provides a bio-based high-barrier, waterproof and oil-resistant paper-based packaging material and its preparation method, including the following steps:

[0071] S1. Weigh 50g of ENR-40 with a solid content of 20%, and slowly add 100g of CNF with a solid content of 1% (equivalent to 10% of the mass of ENR) under mechanical stirring. Continue stirring for 1 hour to achieve uniform dispersion.

[0072] S2. Weigh 0.1g of FeCl3·6H2O, dissolve it in 10mL of water, and slowly add it to the composite emulsion prepared in step S1 with continuous stirring using a dropper. Continue stirring for 30 minutes, and then place it at 50 degrees Celsius to evaporate the water while stirring, so that the final solid content in the mixed dispersion is 10%. Finally, ultrasonically disperse for 30 minutes and remove bubbles to obtain a uniformly dispersed bio-based high barrier coating.

[0073] S3. Apply the bio-based high-barrier coating obtained in S2 evenly to the surface of kraft paper using a scraping method, ensuring the coating thickness remains consistent. After drying, apply the coating again. Repeat this step 5 times to obtain the bio-based high-barrier, waterproof and oil-proof paper-based packaging material.

[0074] Example 5

[0075] This embodiment provides a bio-based high-barrier, waterproof and oil-resistant paper-based packaging material and its preparation method, including the following steps:

[0076] S1. Weigh 50g of ENR-24 with a solid content of 20%, and slowly add 75g of CNC with a solid content of 4% (equivalent to 30% of the mass of ENR) under mechanical stirring. Continue stirring for 1 hour to achieve uniform dispersion.

[0077] S2. Weigh 0.1g of FeCl3·6H2O, dissolve it in 10mL of water, and slowly add it to the composite emulsion prepared in step S1 with continuous stirring using a dropper. Continue stirring for 30 minutes, and then place it at 50 degrees Celsius to evaporate the water while stirring, so that the final solid content in the mixed dispersion is 10%. Finally, ultrasonically disperse for 30 minutes and remove bubbles to obtain a uniformly dispersed bio-based high barrier coating.

[0078] S3. Apply the bio-based high-barrier coating obtained in S2 evenly to the surface of kraft paper using a scraping method, ensuring the coating thickness remains consistent. After drying, apply the coating again. Repeat this step 5 times to obtain the bio-based high-barrier, waterproof and oil-proof paper-based packaging material.

[0079] Example 6

[0080] This embodiment provides a bio-based high-barrier, waterproof and oil-resistant paper-based packaging material and its preparation method, including the following steps:

[0081] S1. Weigh 50g of ENR-40 with a solid content of 20%, and slowly add 75g of CNC with a solid content of 4% (equivalent to 30% of the mass of ENR) under mechanical stirring. Continue stirring for 1 hour to achieve uniform dispersion.

[0082] S2. Weigh 0.1g of FeCl3·6H2O, dissolve it in 10mL of water, and slowly add it to the composite emulsion prepared in step S1 with continuous stirring using a dropper. Continue stirring for 30 minutes, and then place it at 50 degrees Celsius to evaporate the water while stirring, so that the final solid content in the mixed dispersion is 10%. Finally, ultrasonically disperse for 30 minutes and remove bubbles to obtain a uniformly dispersed bio-based high barrier coating.

[0083] S3. Apply the bio-based high-barrier coating obtained in S2 evenly to the surface of kraft paper using a scraping method, ensuring the coating thickness remains consistent. After drying, apply the coating again. Repeat this step three times to obtain the bio-based high-barrier, waterproof, and oil-proof paper-based packaging material.

[0084] Comparative Example 1

[0085] This comparative example provides a coating containing only bio-based rubber and its preparation method, including the following steps:

[0086] S1. Add 50g of water to 50g of ENR-40 emulsion with a solid content of 20%, stir mechanically for 30 minutes, then ultrasonically disperse and defoam for 1 hour to ensure uniform dispersion of epoxidized natural rubber and obtain bio-based rubber coating.

[0087] S2. The bio-based rubber coating obtained in S1 is uniformly coated onto the surface of kraft paper using a scraping method, ensuring that the coating thickness remains consistent. After drying, the next coating is applied. This step is repeated 5 times to obtain a paper-based packaging material coated with bio-based rubber.

[0088] Comparative Example 2

[0089] This comparative example provides a coating containing only CNF and its preparation method, including the following steps:

[0090] S1. Add 50g of water to 50g of CNF dispersion with a solid content of 1%, stir for 30 minutes, then ultrasonically disperse and defoam for 1 hour to make CNF uniformly dispersed and obtain nanocellulose coating.

[0091] S2. The nanocellulose coating obtained in S1 is uniformly coated onto the surface of kraft paper using a scraping method, ensuring that the coating thickness remains consistent. After drying, the next coating is applied. This step is repeated 5 times to obtain nanocellulose-coated paper-based packaging material.

[0092] Performance testing

[0093] The bio-based high-barrier, waterproof and oil-proof paper-based packaging materials obtained in the examples and comparative examples were subjected to performance tests, and the test results are shown in Table 1.

[0094] Table 1. Performance Indicators of Bio-based High-Barrier Waterproof and Oil-Resistant Food Packaging Paper

[0095]

[0096]

[0097] As shown in Table 1, compared with the base paper, the coatings of pure epoxidized natural rubber and pure nanocellulose in the comparative example can improve the barrier properties of the paper to a certain extent. Furthermore, the comparison with the comparative example shows that the water vapor transmission rate, Cobb water value, and Cobb oil value of the coated paper base material all decreased significantly. This indicates that the synergistic effect of rubber and nanocellulose, and the cross-linking by metal ions, can increase the density of the molecular chain arrangement of the coating, thereby improving the barrier properties and stability of the coated paper.

[0098] It should be noted that the bio-based high-barrier, waterproof, and oil-resistant paper-based packaging material provided by this invention is not merely a coating, but rather a product of special design and consideration. Natural rubber is a natural polymer compound with characteristics such as high elasticity, high elongation, hydrophobicity, and environmental friendliness. When used as a coating on paper surfaces, it can improve the mechanical strength and water barrier properties of the paper. However, because paper is a hydrophilic material, natural rubber has poor affinity with paper, and the two cannot bond tightly together. Therefore, epoxidation modification of natural rubber introduces epoxy groups, increasing molecular polarity and facilitating the entry of natural rubber into the paper to form a tight cross-linked network, improving affinity with the paper and avoiding the need for an adhesive layer. Nanocellulose is a hydrophilic substance with high affinity for paper. When added to epoxidized natural rubber, it can also bind with it, facilitating the entry of nanocellulose into the paper to fill the gaps and block the permeation of water vapor and oxygen. Therefore, the cross-linking and coating of nanocellulose and epoxidized natural rubber onto the paper surface greatly improves the paper's barrier properties against oxygen and water vapor, and significantly enhances its waterproof and oil-resistant properties.

[0099] The automatic feeding device includes a weighing device 1. A protective shell 2 is provided at the upper end of the weighing device 1. A connecting plate 15 is slidably connected to the inner side of the front end of the protective shell 2. A storage tank 4 is fixedly connected to the upper end of the protective shell 2. A storage cover 5 is movably connected to the upper end of the storage tank 4. A first trough 7 is fixedly connected to the lower end of the storage tank 4. A first crushing block 33 is movably connected to the inner side of the first trough 7. A second trough 10 is fixedly connected to the lower end of the first trough 7. A second crushing block 34 is movably connected to the inner side of the second trough 10. A diversion trough 11 is fixedly connected to the lower part of the second trough 10. A first diversion port 12 is opened at the lower end of the diversion trough 11. A first locking tooth 19 is provided at the lower end of the connecting plate 15. A baffle 27 is movably connected to the first locking tooth 19. A baffle 30 is provided above the baffle 27. The baffle 30 slides at the lower end of the storage tank 4. The baffle 27 slides at the lower end of the diversion trough 11.

[0100] In this embodiment, two sets of first movable blocks 40 are fixedly connected to the outside of the storage tank 4, and a second movable block 41 is movably connected between the two sets of first movable blocks 40 through a rotating shaft. One end of the second movable block 41 is fixedly connected to the storage cover 5, and a handle 39 is fixedly connected to the upper end of the storage cover 5.

[0101] Specifically, by opening the storage cover 5 with handle 2 39, the raw material is placed in the storage tank 4, and the storage cover 5 is placed on top of the storage tank 4 to seal the raw material and prevent it from contacting the outside world.

[0102] In this embodiment, a support plate 13 is provided on one side of the storage tank 4, and a first diversion plate 6 with a certain inclination angle is fixedly connected to the lower end of the storage tank 4. The first diversion plate 6 is fixedly connected to the first leakage channel 7. A support plate 8 is provided on one side of the first leakage channel 7, and a second diversion plate 9 with a certain inclination angle is fixedly connected to the lower end of the first leakage channel 7. The second diversion plate 9 is fixedly connected to the second leakage channel 10, and the hole on the second leakage channel 10 is smaller than the hole on the first leakage channel 7.

[0103] Specifically, the raw materials in the storage tank 4 can be moved into the first drain tank 7 by the first diversion plate 6, and the raw materials in the first drain tank 7 can be moved into the second drain tank 10 by the second diversion plate 9.

[0104] In this embodiment, both support plate 2 13 and support plate 1 8 are fixedly connected to the protective shell 2. A limiting groove 14 is opened on the inner side of the front end of the protective shell 2. The connecting plate 15 slides in the limiting groove 14. The upper end of the connecting plate 15 is fixedly connected to the first connecting rope 31 and the second connecting rope 32. The front end of the connecting plate 15 is fixedly connected to the handle 16. The rear end of the connecting plate 15 is fixedly connected to the connecting block 18. The connecting block 18 is fixedly connected to the first locking tooth 19. The connecting plate 15 is L-shaped.

[0105] The first connecting rope 31 passes through the upper side of the second support plate 13 and is fixedly connected to the first crushing block 33. The second connecting rope 32 passes through the upper side of the first support plate 8 and is fixedly connected to the second crushing block 34. The first crushing block 33 is adapted to the first trough 7, and the second crushing block 34 is adapted to the second trough 10.

[0106] The protective shell 2 has a first groove 3 on the outer front side and a second groove 17 on the inner front wall. The handle 16 slides inside the first groove 3 and the connecting block 18 is slidably connected to the second groove 17.

[0107] Specifically, by grasping the handle 16 and pulling it downwards, the handle 16 will cause the connecting plate 15 to slide downwards. As the connecting plate 15 moves downwards, it will pull the first crushing block 33 and the second crushing block 34 out of the first trough 7 and the second trough 10, respectively. The downward movement of the connecting plate 15 will also cause the first locking tooth 19 to move downwards.

[0108] In this embodiment, a first gear 21 is engaged on one side of the first locking tooth 19. The first gear 21 is fixedly connected to the rotating rod 20. One end of the rotating rod 20 passes through the fixing plate 37 and is fixedly connected to the second gear 22. The lower end of the second gear 22 is engaged with the third gear 23. The third gear 23 is fixedly connected to the rotating rod 24. One end of the rotating rod 24 passes through the fixing plate 37 and is fixedly connected to the fourth gear 25. A second locking tooth 26 is engaged on one side of the fourth gear 25. The second locking tooth 26 is fixedly connected to the baffle 27.

[0109] Specifically, the first locking tooth 19 meshes with the first gear 21 to make it rotate. The first gear 21 is fixedly connected to the second gear 22, and the second gear 22 will rotate accordingly. The second gear 22 meshes with the third gear 23 to drive it to rotate. The third gear 23 is fixedly connected to the fourth gear 25, and the fourth gear 25 will also rotate. The fourth gear 25 will drive the second locking tooth 26 to move through meshing.

[0110] In this embodiment, a connecting plate 29 is fixedly connected to one side of the second locking tooth 26 and the first baffle 27. The connecting plate 29 is fixedly connected to the second baffle 30. The inner wall of the rear end of the protective shell 2 is provided with a third sliding groove 35 and a fourth sliding groove 36. The second baffle 30 slides inside the third sliding groove 35, and the second locking tooth 26 and the first baffle 27 slide inside the fourth sliding groove 36. A limiting groove 38 is provided on the inner side of the rear end of the protective shell 2, and the connecting plate 29 slides inside the limiting groove 38.

[0111] Specifically, as the first baffle 27 moves, the second baffle 30 also moves out from under the storage slot 4.

[0112] In this embodiment, a second drainage port 28 is provided on the baffle 27, and the second drainage port 28 is the same size as the first drainage port 12.

[0113] Specifically, when the raw material flows into the container through the first inlet 12 and the second inlet 28, the weighing device will weigh the raw material.

[0114] During operation, the raw materials are stored in the storage tank 4. The container is placed above the weighing device 1 and below the baffle 27. The handle 16 is grasped and pulled downwards. The handle 16 will cause the connecting plate 15 to slide downwards. As the connecting plate 15 moves downwards, it will pull the first crushing block 33 and the second crushing block 34 out of the first trough 7 and the second trough 10, respectively. The downward movement of the connecting plate 15 will also cause the first locking tooth 19 to move downwards. At the same time, the first locking tooth 19 will mesh with the first gear 21 and rotate. The first gear 21 and the second gear 22 are fixed. When connected, the second gear 22 will rotate, meshing with the third gear 23 and causing it to rotate. The third gear 23 is fixedly connected to the fourth gear 25, which will also rotate. The fourth gear 25, through meshing, will drive the second retaining tooth 26 to move, moving the second inlet 28 on the baffle 1 27, which is fixedly connected to it, below the first inlet 12. At the same time as the baffle 1 27 moves, the baffle 2 30 will also move out from below the storage tank 4. The raw materials stored in the storage tank 4 will flow into the first drain trough 7 along the first inlet plate 6. Release handle 16, and the first crushing block 33 falls into the first trough 7 due to its own weight. Simultaneously, it moves the connecting plate 15 upwards, causing the first locking tooth 19, which is fixedly connected to the connecting plate 15, to also move upwards. This causes the baffle 30 to move back below the storage tank 4, blocking it and preventing the material from flowing out. The first crushing block 33 falls into the first trough 7, crushing the material inside. Pull handle 16 downwards again, and the crushed material falls from the hole along the second guide plate 9 into the second trough 10. Release handle 16, and the second crushing block 34... Its weight falls into the second trough 10, crushing the raw material again. The crushed raw material flows out of the hole and gathers in the diversion trough 11. When the first diversion port 12 and the second diversion port 28 are aligned, it flows into the container. The weighing device will weigh the raw material. This process is repeated until the required weight of raw material is taken out. When not in use, the second diversion port 28 will be moved away from below the first diversion port 12, and the baffle 27 will block the first diversion port 12 to prevent the raw material from flowing out, keeping the raw material in a closed space to prevent personnel from contaminating the raw material.

[0115] The above description is merely a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A process for the preparation of a bio-based high-barrier, water- and oil- resistant paper-based packaging material, characterized by: An automatic dosing device is used in the addition of natural latex or epoxidized natural latex. The automatic dosing device includes a protective shell (2) at the upper end of the weighing device (1). A connecting plate (15) is slidably connected to the inner side of the front end of the protective shell (2). A storage tank (4) is fixedly connected to the upper end of the protective shell (2). A storage cover (5) is movably connected to the upper end of the storage tank (4). A first drain (7) is fixedly connected to the lower end of the storage tank (4). A first crushing block (33) is movably connected to the inner side of the first drain (7). A second drain is fixedly connected to the lower end of the first drain (7). The second drain (10) is movably connected to the inner side of the second drain (10) and a second crushing block (34). A diversion trough (11) is fixedly connected to the lower part of the second drain (10). A first diversion port (12) is opened at the lower end of the diversion trough (11). A first locking tooth (19) is provided at the lower end of the connecting plate (15). A baffle (27) is movably connected to the first locking tooth (19). A baffle (30) is provided above the baffle (27). The baffle (30) slides at the lower end of the storage trough (4). The baffle (27) slides at the lower end of the diversion trough (11). Two sets of first movable blocks (40) are fixedly connected to the outside of the storage tank (4). A second movable block (41) is movably connected between the two sets of first movable blocks (40) through a rotating shaft. One end of the second movable block (41) is fixedly connected to the storage cover (5). A handle (39) is fixedly connected to the upper end of the storage cover (5). A second support plate (13) is provided on one side of the storage tank (4). A first diversion plate (6) with a certain inclination angle is fixedly connected to the lower end of the storage tank (4). The first diversion plate (6) is fixedly connected to the first leakage channel (7). A first support plate (8) is provided on one side of the first leakage channel (7). A second diversion plate (9) with a certain inclination angle is fixedly connected to the lower end of the first leakage channel (7). The second diversion plate (9) is fixedly connected to the second leakage channel (10). The hole on the second leakage channel (10) is smaller than the hole on the first leakage channel (7). The second support plate (13) and the first support plate (8) are both fixedly connected to the protective shell (2). The protective shell (2) has a limiting groove (14) on the inner side of the front end. The first connecting plate (15) slides in the limiting groove (14). The upper end of the first connecting plate (15) is fixedly connected to the first connecting rope (31) and the second connecting rope (32). The front end of the first connecting plate (15) is fixedly connected to the first handle (16). The rear end of the first connecting plate (15) is fixedly connected to the connecting block (18). The connecting block (18) is fixedly connected to the first locking tooth (19). The first connecting plate (15) is L-shaped. The first connecting rope (31) passes through the upper side of the second support plate (13) and is fixedly connected to the first rolling block (33). The second connecting rope (32) passes through the upper side of the first support plate (8) and is fixedly connected to the second rolling block (34). The first rolling block (33) is adapted to the first trough (7), and the second rolling block (34) is adapted to the second trough (10).

2. A process for the preparation of a bio-based high barrier, water and oil repellent paper-based packaging material according to claim 1, characterized in that: The protective shell (2) has a first sliding groove (3) on the outer side of its front end, and a second sliding groove (17) on the inner wall of its front end. The handle (16) slides inside the first sliding groove (3), and the connecting block (18) is slidably connected to the second sliding groove (17). A fixing plate (37) is fixedly connected between one side of the protective shell (2) and the drainage channel (11). A rotating rod one (20) and a rotating rod two (24) are rotatably connected on the fixing plate (37). The fixing plate (37) is L-shaped. The first gear (21) is engaged with one side of the first locking tooth (19). The first gear (21) is fixedly connected to the first rotating rod (20). One end of the first rotating rod (20) is fixedly connected to the second gear (22) through the fixing plate (37). The lower end of the second gear (22) is engaged with the third gear (23). The third gear (23) is fixedly connected to the second rotating rod (24). One end of the second rotating rod (24) is fixedly connected to the fourth gear (25) through the fixing plate (37). The second locking tooth (26) is engaged with one side of the fourth gear (25). The second locking tooth (26) is fixedly connected to the first baffle (27).

3. A process for the preparation of a bio-based high barrier, water and oil repellent paper-based packaging material according to claim 2, characterized in that: A connecting plate 2 (29) is fixedly connected to one side of the second locking tooth (26) and the first baffle (27). The connecting plate 2 (29) is fixedly connected to the second baffle (30). The inner wall of the rear end of the protective shell (2) is provided with a third sliding groove (35) and a fourth sliding groove (36). The second baffle (30) slides inside the third sliding groove (35). The second locking tooth (26) and the first baffle (27) slide inside the fourth sliding groove (36). The inner side of the rear end of the protective shell (2) is provided with a limiting groove 2 (38). The connecting plate 2 (29) slides inside the limiting groove 2 (38). The baffle (27) is provided with a second drain port (28), which is the same size as the first drain port (12).

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