A degradable plant-based adhesive tape and a preparation method thereof

Abstract

The present application relates to a kind of degradable plant-based adhesive tape, including substrate layer, release layer and plant adhesive layer, release layer is set to substrate layer back, plant adhesive layer is set to substrate layer front, substrate layer and plant adhesive layer between being provided with connecting layer, connecting layer includes the polylactic acid fiber that is diamond-shaped distribution on substrate layer;Substrate layer includes maltodextrin, plant glue and polylactic acid fiber.By using the above technical solution, the prepared adhesive tape is degradable, and the damage to the environment is reduced;Diamond-shaped distribution improves tensile strength;Adopt polylactic acid fiber, complete biodegradation, can be obtained from grain and does not need special equipment and operating process, low in cost, and have good biocompatibility and absorbability;With substrate layer and plant adhesive layer are fully adhered, and have certain heat resistance and tensile strength.

Description

Technical Field

[0001] This invention belongs to the field of adhesive tape, specifically relating to a biodegradable plant-based adhesive tape and its preparation method. Background Technology

[0002] In today's production and daily life, packaging sealing tape is widely used due to its convenience, and it is widely used in industries such as manufacturing and express logistics.

[0003] Traditional express delivery tapes are mostly transparent film-type tapes. Their base layer primarily consists of polymers such as polypropylene, polyvinyl chloride, and polyethylene terephthalate. These polymers are non-biodegradable, and their extensive use causes environmental pollution and a processing burden, while also hindering the recycling of cardboard boxes. While traditional kraft paper tape is biodegradable, its poor tensile strength makes it unsuitable for sealing heavier objects (poor load-bearing capacity, easily broken). Currently, over 95% of the tapes used in packaging are non-biodegradable ordinary BOPP film tapes, with kraft paper tape being used less frequently. Because ordinary film tapes are difficult to degrade, increasing recycling costs and causing environmental pollution, the government is strongly advocating for the use of biodegradable tapes. Larger logistics and express delivery companies are actively responding and promoting their use, indicating a promising market outlook. Summary of the Invention

[0004] In summary, to overcome the shortcomings of existing products, this invention provides a biodegradable plant-based tape and its preparation method.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a biodegradable plant-based tape, comprising a substrate layer, a release layer, and a plant adhesive layer, wherein the release layer is disposed on the back side of the substrate layer, the plant adhesive layer is disposed on the front side of the substrate layer, and a connecting layer is disposed between the substrate layer and the plant adhesive layer, the connecting layer comprising polylactic acid fibers distributed in a rhombic pattern on the substrate layer; the substrate layer comprises maltodextrin, plant adhesive, and polylactic acid fibers.

[0006] By adopting the above technical solution, using a substrate layer and a plant-based adhesive layer, the tape removal steps can be reduced when recycling cardboard boxes, making the resulting tape easily degradable and recyclable along with the cardboard boxes. This reduces cardboard box recycling costs, increases recycling rates, and reduces the consumption of natural resources. Simultaneously, the diamond-patterned connecting layer enhances the tape's tensile strength, giving it excellent tensile properties. The polylactic acid fiber used is completely biodegradable, does not emit toxic gases when burned, and causes no pollution (environmentally friendly). It can be obtained from grains and can be spun without special equipment or processes, resulting in low cost. It has the highest melting point, high crystallinity, good transparency, and excellent biocompatibility and bioabsorbability, allowing for strong adhesion to the substrate layer and plant-based adhesive layer. Furthermore, its high crystallinity and high orientation result in high heat resistance and high strength.

[0007] The present invention further comprises: the substrate layer including a first substrate layer and a second substrate layer, and a plurality of connecting units are provided between the first substrate layer and the second substrate layer. Each connecting unit includes a connecting post arranged in a regular hexagon at the hexagonal corner. One end of the connecting post is disposed in the first substrate layer and the other end is disposed in the second substrate layer.

[0008] By adopting the above technical solution, a double-layer composite substrate is used to enhance the strength of the substrate layer, giving it excellent tensile properties to meet the strength requirements for encapsulation using the tape. Connecting units are set up, with connecting posts in each unit arranged in a regular hexagonal pattern at the hexagonal corners to resist deformation. The hexagonal distribution also ensures a more uniform distribution of connecting posts between adjacent units, improving connection strength. The connecting posts are made of plant-based adhesive, while the substrate layer material is primarily composed of maltodextrin and plant-based adhesive. The connecting posts and the substrate layer have similar structural units, allowing the plant-based adhesive to be absorbed into both the first and second substrate layers after coating, thus improving the adhesion between the two substrate layers.

[0009] The present invention further comprises: the release layer is disposed on the back side of the first substrate layer, the first substrate layer is a waterproof layer, the second substrate layer is a tensile layer, and the first substrate layer is arranged in a fish scale pattern.

[0010] By adopting the above technical solution, the first substrate layer and the second substrate layer are treated differently according to different needs (by adjusting the materials or performing other processes), thereby enhancing the performance of the substrate layer, so that it meets the requirements of biodegradability and the strength requirements of the tape, thus enhancing its practicality; the first substrate layer is arranged in a fish scale pattern, which enhances waterproof performance and ensures strength while making it easy to tear along the fish scale joints, and also makes it easy to observe the tear position, making it convenient to use.

[0011] The present invention further comprises the following components in parts by weight: 60-90 parts maltodextrin, 45-60 parts plant gum, 15-25 parts polylactic acid fiber, 3.0-5.0 parts coupling agent, 0.3-0.5 parts lubricant, and 0.3-0.5 parts stabilizer.

[0012] By adopting the above technical solution, the main material of the substrate layer is maltodextrin and plant gum. The active groups of maltodextrin and plant gum can cross-link and exhibit a multidimensional network reaction, thereby forming the skeleton of the substrate layer. Polylactic acid fiber is distributed between maltodextrin and plant gum, mainly used to improve the strength of the prepared substrate layer, so that it has excellent tensile properties and meets the strength requirements for encapsulation using this tape.

[0013] Furthermore, the substrate layer exhibits optimal tensile properties when it comprises the following components in parts by weight: 80 parts maltodextrin; 50 parts plant gum; 20 parts polylactic acid cellulose; 3 parts coupling agent; 2 parts plasticizer; 0.3 parts lubricant; and 0.3 parts stabilizer.

[0014] The present invention further includes: the plant gum includes one or both of locust bean gum and seaweed gum.

[0015] By adopting the above technical solutions, seaweed gum has significant advantages in terms of thickening, stability, gelling, shape retention, and film forming properties. Locust bean gum and seaweed gum have a good gel synergistic effect. When used in combination, the dosage can be reduced and the gel structure can be improved.

[0016] The present invention further comprises the following components in parts by weight: 6-12 parts of locust bean gum and 3-6 parts of seaweed gum.

[0017] By adopting the above technical solution, the two plant gums are mixed in a certain proportion to achieve mutual interaction and promote modification, so that the mixed plant gum has highly active groups, and then reacts with maltodextrin. At the same time, both are biodegradable and more environmentally friendly.

[0018] The present invention further comprises the following components in parts by weight: the plant adhesive layer comprises the following components in parts by weight: 15-20 parts of locust bean gum, 6-12 parts of seaweed gum, 3-5 parts of carrageenan gum, 3-5 parts of glutinous rice gum, and 260-320 parts of water.

[0019] By adopting the above technical solution, the raw materials of the plant adhesive layer of the present invention are the same locust bean gum and seaweed gum as the plant gum of the substrate layer. The locust bean gum and seaweed gum of the substrate layer can be integrated with the locust bean gum and seaweed gum of the plant adhesive layer by utilizing the principle of like dissolves like, thereby improving the adhesion between the plant adhesive layer and the substrate layer.

[0020] This invention also provides a method for preparing a biodegradable plant-based adhesive tape substrate layer, comprising the following steps: Step 1: Prepare materials according to the specified proportions, dissolve the plant adhesive in water for 16h to 24h, stir evenly, and obtain a first mixture; Step 2: Heat the prepared maltodextrin, polylactic acid fiber, coupling agent, plasticizer, and the first mixture to 80℃ to 100℃ and mix and stir for 10min to 20min, then mix with lubricant and stabilizer and stir evenly to obtain a second mixture; Step 3: Extrude and blown film the second mixture to obtain the substrate layer.

[0021] This invention also provides a method for preparing a biodegradable plant-based adhesive tape material, comprising the following steps: Step S1: Prepare materials according to the specified proportions, mix seaweed gum and glutinous rice gum in water at 50-80°C, then seal and shield from light for 26-30 hours to obtain a first adhesive solution; Step S2: Mix locust bean gum with an acidic solution with pH 5.0-6.5 and let stand for 12-15 hours to obtain a second adhesive solution; Step S3: Mix carrageenan with an alkaline solution with pH 10.5-12.0 and let stand for 12-15 hours to obtain a third adhesive solution; Step S4: Mix the second adhesive solution and the third adhesive solution for 20-30 minutes, adjust the pH to 6.5-7.5, and then add the first adhesive solution to obtain the plant-based adhesive tape material.

[0022] The advantages of this invention are: the materials are widely available, no special operating process is required, the preparation is simple, the cost is low, and it is renewable, biodegradable, and environmentally friendly.

[0023] This invention also provides a method for preparing biodegradable plant-based adhesive tape, comprising the following steps: Step 1: Waterproofing and abrasion-resistant treatment of the substrate layers to form a first substrate layer and a second substrate layer; Step 2: Using a specially designed perforating wheel, pressing multiple 100-300µm holes into the first and second substrate layers respectively; Step 3: Applying plant-based adhesive between the first and second substrate layers; Step 4: Composite the first and second substrate layers; Step 5: Applying a release agent to the waterproof layer; Step 6: Soaking polylactic acid fibers in castor oil and adding diacid anhydride, allowing it to stand for 1-3 hours, and then removing it for later use; Step 7: After the first adhesive application, mixing and stirring the prepared polylactic acid fibers with the plant-based adhesive layer material, and then applying it in a diamond pattern onto the composite substrate layer, followed by a second adhesive application and drying; Step 8: Cutting.

[0024] The advantages of this invention are: after pressing multiple 100-300µm holes into the first and second substrate layers using a specially designed perforating wheel, plant adhesive is coated between the first and second substrate layers and then laminated. After the plant adhesive penetrates into the holes of the first and second substrate layers, it solidifies and forms connecting pillars, which greatly enhances the tensile strength of the substrate layers and improves the strength of the tape. Furthermore, polylactic acid fibers are soaked in castor oil and diacid anhydride is added and left to stand before use. The diacid anhydride has a modifying effect on polylactic acid fibers, enhancing their tensile properties. This invention has the advantages of good toughening effect, being environmentally friendly, and low cost.

[0025] The embodiments describe specific implementations of the present invention. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the adhesive tape according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the connection layer structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the connecting column in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the second substrate layer in an embodiment of the present invention; Figure 5 This is a partial process diagram illustrating the preparation of the composite substrate layer in an embodiment of the present invention; Figure 6 A material ratio table (by weight) for the substrate layer in an embodiment of the present invention; Figure 7 Here is a material ratio table (by weight) for the plant-based adhesives in embodiments of the present invention. Figure 8 This is a comparison chart of tape parameters in embodiments of the present invention; Reference numerals: 1. Substrate layer, 11. First substrate layer, 12. Second substrate layer, 2. Release layer, 3. Plant adhesive layer, 4. Connecting layer, 41. Polylactic acid fiber, 5. Connecting unit, 51. Plant connecting column. Detailed Implementation

[0027] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0028] See appendix Figure 1-8This embodiment discloses a biodegradable plant-based tape, comprising a substrate layer, a release layer, and a plant adhesive layer. The release layer is disposed on the back side of the substrate layer, and the plant adhesive layer is disposed on the front side of the substrate layer. A connecting layer is disposed between the substrate layer and the plant adhesive layer. The connecting layer comprises polylactic acid fibers distributed in a diamond pattern on the substrate layer. The substrate layer comprises maltodextrin, plant adhesive, and polylactic acid fibers.

[0029] This embodiment further includes the following configuration: the substrate layer comprises a first substrate layer and a second substrate layer, and a plurality of connecting units are provided between the first substrate layer and the second substrate layer. Each connecting unit includes a connecting post in the shape of a regular hexagon disposed at the hexagonal corner. The connecting post is formed by the coagulation of plant adhesive. One end of the connecting post is disposed in the first substrate layer and the other end is disposed in the second substrate layer.

[0030] In this embodiment, the release layer is further configured such that it is disposed on the back side of the first substrate layer, the first substrate layer is a waterproof layer, the second substrate layer is a tensile layer, and the first substrate layer is configured in a fish-scale pattern.

[0031] This embodiment further specifies that the substrate layer comprises the following components in parts by weight: 60-90 parts maltodextrin, 45-60 parts plant gum, 15-25 parts polylactic acid fiber, 3.0-5.0 parts coupling agent, 0.3-0.5 parts lubricant, and 0.3-0.5 parts stabilizer.

[0032] This embodiment further specifies that the plant gum includes one or both of locust bean gum and seaweed gum.

[0033] This embodiment further specifies that the plant gum comprises the following components in parts by weight: 6-12 parts of locust bean gum and 3-6 parts of seaweed gum.

[0034] This embodiment further specifies that the plant adhesive layer comprises the following components in parts by weight: 15-20 parts locust bean gum, 6-12 parts seaweed gum, 3-5 parts carrageenan gum, 3-5 parts glutinous rice gum, and 260-320 parts water.

[0035] This invention also provides a method for preparing a biodegradable plant-based adhesive tape substrate layer, comprising the following steps: Step 1: Prepare materials according to the specified proportions, dissolve the plant adhesive in water for 16h to 24h, stir evenly, and obtain a first mixture; Step 2: Heat the prepared maltodextrin, polylactic acid fiber, coupling agent, plasticizer, and the first mixture to 80℃ to 100℃ and mix and stir for 10min to 20min, then mix with lubricant and stabilizer and stir evenly to obtain a second mixture; Step 3: Extrude and blown film the second mixture to obtain the substrate layer.

[0036] This invention also provides a method for preparing a biodegradable plant-based adhesive tape material, comprising the following steps: Step S1: Prepare materials according to the specified proportions, mix seaweed gum and glutinous rice gum in water at 50-80°C, then seal and shield from light for 26-30 hours to obtain a first adhesive solution; Step S2: Mix locust bean gum with an acidic solution with pH 5.0-6.5 and let stand for 12-15 hours to obtain a second adhesive solution; Step S3: Mix carrageenan with an alkaline solution with pH 10.5-12.0 and let stand for 12-15 hours to obtain a third adhesive solution; Step S4: Mix the second adhesive solution and the third adhesive solution for 20-30 minutes, adjust the pH to 6.5-7.5, and then add the first adhesive solution to obtain the plant-based adhesive tape material.

[0037] This invention also provides a method for preparing biodegradable plant-based adhesive tape, comprising the following steps: Step 1: Waterproofing and abrasion-resistant treatment of the substrate layers to form a first substrate layer and a second substrate layer; Step 2: Using a specially designed perforating wheel, pressing multiple 100-300µm holes into the first and second substrate layers respectively; Step 3: Applying plant-based adhesive between the first and second substrate layers; Step 4: Composite the first and second substrate layers; Step 5: Applying a release agent to the waterproof layer; Step 6: Soaking polylactic acid fibers in castor oil and adding diacid anhydride, allowing it to stand for 1-3 hours, and then removing it for later use; Step 7: After the first adhesive application, mixing and stirring the prepared polylactic acid fibers with the plant-based adhesive layer material, and then applying it in a diamond pattern onto the composite substrate layer, followed by a second adhesive application and drying; Step 8: Cutting.

[0038] The above description is only a preferred embodiment and implementation of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A biodegradable plant-based adhesive tape, characterized in that: The material comprises a substrate layer, a release layer, and a plant-based adhesive layer. The release layer is disposed on the back side of the substrate layer, and the plant-based adhesive layer is disposed on the front side of the substrate layer. A connecting layer is disposed between the substrate layer and the plant-based adhesive layer. The connecting layer comprises polylactic acid fibers distributed in a rhombic pattern on the substrate layer. The substrate layer comprises a first substrate layer and a second substrate layer. Multiple connecting units are disposed between the first substrate layer and the second substrate layer. Each connecting unit comprises a plant-based connecting column arranged in a regular hexagon at the hexagonal corner. The plant-based connecting column is formed by the coagulation of plant-based adhesive. One end of the plant-based connecting column is disposed in the first substrate layer, and the other end is disposed in the second substrate layer. The release layer is disposed on the back side of the first substrate layer. The first substrate layer is a waterproof layer, and the second substrate layer is a tensile layer. The first substrate layer is arranged in a fish-scale pattern. The substrate layer comprises the following components in parts by weight: 60-90 parts maltodextrin, 45-60 parts plant-based adhesive, 15-25 parts polylactic acid fibers, 3.0-5.0 parts coupling agent, and 0.3-0.5 parts lubricant. The plant gum comprises 0.3 to 0.5 parts of a stabilizer; the plant gum includes one or both of locust bean gum and seaweed gum; the plant gum adhesive layer comprises the following components in parts by weight: 15 to 20 parts of locust bean gum, 6 to 12 parts of seaweed gum, 3 to 5 parts of carrageenan gum, 3 to 5 parts of glutinous rice gum, and 260 to 320 parts of water.

2. A biodegradable plant-based adhesive tape as described in claim 1, characterized in that, The method for preparing the substrate layer The process includes the following steps: Step 1: Prepare the materials according to the specified proportions, dissolve the plant gum in water for 16-24 hours, stir evenly, and obtain the first mixture; Step 2: Heat the prepared maltodextrin, polylactic acid fiber, coupling agent, plasticizer, and the first mixture to 80-100°C and stir for 10-20 minutes, then mix with lubricant and stabilizer and stir evenly to obtain the second mixture; Step 3: Extrude the second mixture into a blown film to obtain the substrate layer.

3. A biodegradable plant-based adhesive tape as described in claim 1, characterized in that, The preparation method of the plant adhesive layer material includes the following steps: Step S1: Prepare materials according to the proportions, mix seaweed gum and glutinous rice gum in water at 50-80℃, then seal and shield from light for 26-30 hours to obtain a first adhesive solution; Step S2: Mix locust bean gum with an acidic solution with pH 5.0-6.5 and let stand for 12-15 hours to obtain a second adhesive solution; Step S3: Mix carrageenan with an alkaline solution with pH 10.5-12.0 and let stand for 12-15 hours to obtain a third adhesive solution; Step S4: Stir the second adhesive solution and the third adhesive solution for 20-30 minutes, adjust the pH to 6.5-7.5, and then add the first adhesive solution to obtain the plant adhesive layer material.

4. A method for preparing the biodegradable plant-based adhesive tape as described in claim 1, characterized in that, Includes the following steps: Step Step 1: Waterproofing and abrasion-resistant treatments are applied to the substrate layers to form a first substrate layer and a second substrate layer; Step 2: Multiple 100-300μm holes are pressed into the first and second substrate layers using specially designed punching wheels. Step 3: Apply plant-based adhesive between the first and second substrate layers; Step 4: Lay the first and second substrate layers together; Step 5: Apply release agent to the waterproof layer; Step 6: Soak polylactic acid fibers in castor oil and add diacid anhydride, let stand for 1-3 hours, then remove and set aside; Step 7: After the first adhesive application, mix the prepared polylactic acid fibers with the plant-based adhesive layer material, stir, and apply in a diamond pattern to the composite substrate layer, then apply a second adhesive application and dry; Step 8: Cut.

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