Environment-friendly cigarette tow carton material and preparation method thereof
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN XINTIANCHENG ENVIRONMENTAL PROTECTION PACKAGING TECH CO LTD
- Filing Date
- 2025-04-10
- Publication Date
- 2026-05-29
Smart Images
Figure CN120311519B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of tobacco packaging materials technology, specifically to an environmentally friendly tobacco tow carton material and its preparation method. Background Technology
[0002] With increasing global environmental awareness and the growing acceptance of sustainable development concepts, all industries are actively seeking more environmentally friendly and sustainable production methods. As a traditional high-energy-consuming and high-emission industry, the tobacco industry is increasingly concerned about waste treatment and resource recycling. Tobacco stems, the stalks of tobacco plants, are one of the main wastes from tobacco production and have enormous recycling potential. However, due to the hydrophilic nature and high lignin content of tobacco stems, their direct application in the preparation of cardboard box materials presents many difficulties.
[0003] Environmentally friendly cigarette cardboard box material is a type of cardboard box material with high fiber content and good biodegradability, with waste tobacco stems as its main raw material. This cardboard box material is specifically designed for packing tobacco tow, meeting the specific packaging material requirements of tobacco products while embodying the concepts of environmental protection and sustainable development. Compared to traditional wooden cardboard box materials, environmentally friendly cigarette cardboard box material has significant advantages. First, tobacco stems, as a major waste product in the tobacco production process, have a huge annual output and abundant resources, providing a sufficient source of raw materials for the preparation of environmentally friendly cigarette cardboard box material. Second, using tobacco stems to prepare cardboard box material can not only reduce raw material costs but also reduce waste disposal costs, thereby lowering overall production costs. Furthermore, during the preparation process, components such as cellulose diacetate can be added to further improve the physical properties, durability, and stability of the cardboard box material.
[0004] Despite the numerous advantages of environmentally friendly cigarette cardboard materials, existing preparation methods still have some problems that limit their widespread application. Due to many uncertainties in the raw material pretreatment and biological treatment processes, the finished product performance of environmentally friendly cigarette cardboard materials is unstable, making it difficult to meet the high requirements of tobacco products for packaging materials. Based on this, this invention proposes an environmentally friendly cigarette tow cardboard material and its preparation method. Summary of the Invention
[0005] The purpose of this invention is to provide an environmentally friendly cigarette tow carton material and its preparation method, which has excellent mechanical properties and is easily degradable.
[0006] In a first aspect, the present invention provides a method for preparing an environmentally friendly cigarette tow carton material, comprising the following steps:
[0007] S1. After crushing the tobacco stems, soak them in a solution containing lignin-degrading enzyme for ultrasonic reaction, centrifuge them and then steam-explode them. After that, soak them in an ethanol solution of silane coupling agent, filter, wash and air-dry them until the moisture content is ≤5% to obtain the pretreated tobacco stems.
[0008] S2. Bamboo fiber and sugarcane bagasse fiber are soaked and washed in NaOH aqueous solution and then ground to 180-220 mesh to obtain pretreated bamboo fiber and pretreated sugarcane bagasse fiber.
[0009] S3. Premix the pretreated tobacco stems, pretreated bamboo fiber, pretreated sugarcane bagasse fiber and water, add chitosan and nanocellulose and stir to obtain a mixed pulp; after papermaking, environmentally friendly cigarette carton material is obtained.
[0010] Further, the preparation method of the solution containing lignin-degrading enzyme includes: taking 0.1-0.2M citric acid aqueous solution and 0.2-0.3M disodium hydrogen phosphate aqueous solution, mixing them at a volume ratio of 3-4:6-7, adjusting the pH to 4.5-5 to obtain a buffer solution, adding white rot fungus, laccase and xylanase to the buffer solution, and then adding polyethylene glycol 4000 and Tween 20 in sequence, and stirring magnetically for 25-35 minutes until completely dissolved.
[0011] Furthermore, the ratio of the white-rot fungus, laccase, xylanase, polyethylene glycol 4000, Tween 20 and buffer solution is (1-1.2)g:(0.5-0.7)g:(0.8-1)g:(2-3)g:(1-1.2)g:1L.
[0012] Furthermore, the laccase activity is 80,000-100,000 U / g; the xylanase activity is 60,000-80,000 U / g.
[0013] Furthermore, the steam explosion step includes: performing steam explosion at a pressure of 1-2 MPa for 5-7 minutes, and then rapidly reducing the pressure to 0.7-0.9 MPa and maintaining it for 2-3 minutes.
[0014] Furthermore, the weight ratio of polyvinyl alcohol, glycerol, seaweed extract and calcium silicate is 100:(4-6):(2-3):(8-10).
[0015] Further, the method for preparing the ethanol solution of the silane coupling agent includes: dispersing the silane coupling agent KH550 and nano-silica in ethanol, wherein the weight ratio of the silane coupling agent KH550, nano-silica and ethanol is (0.5-1):(0.2-0.4):100.
[0016] Furthermore, the weight ratio of the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, water, chitosan and nanocellulose is (4-5):(2-3):(1-2):(85-95):(1-2):(0.5-0.7).
[0017] Furthermore, the papermaking step includes: forming the mixed pulp through a wire paper machine and hot-pressing and drying it at a temperature of 100-110℃ and a pressure of 8-10MPa.
[0018] Furthermore, the mixed slurry also includes cellulose diacetate.
[0019] Furthermore, the preparation method of environmentally friendly cigarette tow cardboard box material includes the following steps:
[0020] S1. After crushing the tobacco stems, soak them in a solution containing lignin-degrading enzyme for ultrasonic reaction, centrifuge them and then steam-explode them. After that, soak them in an ethanol solution of silane coupling agent, filter, wash and air-dry them until the moisture content is ≤5% to obtain the pretreated tobacco stems.
[0021] S2. Bamboo fiber and sugarcane bagasse fiber are soaked and washed in NaOH aqueous solution and then ground to 180-220 mesh to obtain pretreated bamboo fiber and pretreated sugarcane bagasse fiber.
[0022] S3. Premix the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber and water, add chitosan, nanocellulose and diacetate fiber and stir to obtain a mixed pulp; after papermaking, environmentally friendly cigarette carton material is obtained.
[0023] Furthermore, the weight ratio of the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, water, chitosan, nanocellulose and diacetate fiber is (4-5):(2-3):(1-2):(85-95):(1-2):(0.5-0.7):(0.5-1).
[0024] Secondly, the present invention provides an environmentally friendly cigarette tow carton material, which is prepared using the aforementioned preparation method.
[0025] Thirdly, the present invention provides an environmentally friendly cigarette carton, which is prepared using the aforementioned environmentally friendly cigarette carton material. The environmentally friendly cigarette carton includes a carton top cover (1), a carton middle body (2), and a carton bottom cover (3) that are separately arranged.
[0026] The beneficial effects of this invention are as follows:
[0027] In this invention, a gradient steam explosion process is used during the pretreatment of tobacco stems. High-pressure explosion can rapidly release the steam pressure inside the fibers, destroying the lignin-carbohydrate complex in the fiber structure and dispersing the fiber bundles. The low-pressure maintenance stage helps to further separate the fiber microfibrils, increase the specific surface area and porosity of the fibers, thereby improving the bonding force between fibers and the overall mechanical properties of the cardboard material.
[0028] On the surface of pretreated tobacco stems, this invention employs a composite modification method using silane coupling agent KH550 and nano-silica to enhance the interfacial bonding between fibers and the matrix through a dual mechanism of chemical bonding and physical anchoring. The amino groups of the silane coupling agent KH550 can form covalent bonds with the hydroxyl groups of cellulose, thereby introducing active functional groups onto the fiber surface. Simultaneously, nano-silica, as an inorganic filler, can fill defects on the fiber surface, increasing the contact area and interaction forces between fibers. This composite modification method not only improves the bonding strength of the fiber-matrix interface but also enhances the puncture resistance of the cardboard material.
[0029] This invention utilizes a ternary enzyme system of white-rot fungi, laccase, and xylanase in the preparation of a solution containing lignin-degrading enzymes. Through synergistic action, this system achieves highly efficient degradation of lignin. White-rot fungi, as the raw material for producing active enzymes, generate lignin-degrading enzymes such as lignin-degrading enzymes, initiating the initial degradation of lignin. Laccase catalyzes the oxidative polymerization reaction of lignin, further disrupting its structure. Xylanase primarily acts on hemicellulose, reducing the binding force between fibers and promoting fiber dispersion. The ternary enzyme system (enzyme-producing white-rot fungi + laccase + xylanase) achieves highly efficient and targeted degradation of lignin through synergistic effects, thereby improving fiber dispersion and the mechanical properties of the cardboard material. Simultaneously, the removal of lignin also contributes to improving the biodegradability of the cardboard material. Attached Figure Description
[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.
[0031] Figure 1 This is a schematic diagram of an environmentally friendly cigarette carton according to the present invention. In the diagram, 1 is the top cover of the carton, 2 is the upper sealing plate, 3 is the middle body of the carton, 4 is the lower sealing plate, and 5 is the lower support cover of the carton.
[0032] Figure 2 These are four structural views of an environmentally friendly cigarette carton according to the present invention. In these views, 6 is the front view, 7 is the top view, 8 is the left view, and 9 is the right view. Detailed Implementation
[0033] The technical solution of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0034] It should be noted that the average particle size of the nano-silica in this invention is 20nm; the bamboo fiber and sugarcane bagasse fiber in this invention are obtained by air-drying bamboo and sugarcane and then pulverizing them to an average length of 2mm; the nanocellulose was purchased from Hubei Yamaide Biomedical Co., Ltd.; laccase CAS: 80498-15-3; xylanase CAS: 9025-57-4.
[0035] It should also be noted that the white-rot fungus in this invention is white-rot fungus WH-B-X3, with the deposit address in Wuhan, China, Wuhan University, and the deposit number CCTCC NO:M 2024884. It is classified and named as white-rot fungus WH-B-X3P l eurotusostreatus WH-B-X3.
[0036] Example 1
[0037] This embodiment provides a method for preparing an environmentally friendly cigarette tow cardboard box material, the steps of which include:
[0038] S1. After crushing the tobacco stems to a particle size ≤2mm, soak them in a solution containing lignin-degrading enzyme and sonicate them at 45℃ for 5.5h. After centrifugation, steam explosion is performed at a pressure of 1.5MPa for 6min, then the pressure is rapidly reduced to 0.8MPa and maintained for 2.5min. Subsequently, they are soaked in an ethanol solution of silane coupling agent for 11h, and then heated to 115℃ and maintained for 55min. After filtration, washing, and air drying to a moisture content of 5%, the pretreated tobacco stems are obtained.
[0039] The preparation method of the solution containing lignin-degrading enzyme includes: taking 0.15M citric acid aqueous solution and 0.25M disodium hydrogen phosphate aqueous solution, mixing them at a volume ratio of 3.5:6.5, adjusting the pH to 4.7 to obtain a buffer solution, adding white-rot fungus, laccase, and xylanase to the buffer solution, and then adding polyethylene glycol 4000 and Tween 20 in sequence, stirring magnetically for 30 minutes until completely dissolved; the volume ratio of white-rot fungus, laccase, xylanase, polyethylene glycol 4000, Tween 20, and buffer solution is 1.1g:0.6g:0.9g:2.5g:1.1g:1L;
[0040] The laccase activity is 90,000 U / g; the xylanase activity is 70,000 U / g.
[0041] The method for preparing the ethanol solution of the silane coupling agent includes: dispersing the silane coupling agent KH550 and nano-silica in ethanol, wherein the weight ratio of the silane coupling agent KH550, nano-silica and ethanol is 0.7:0.3:100.
[0042] S2. Bamboo fiber and sugarcane bagasse fiber were soaked in a 7% NaOH aqueous solution for 22 hours, washed with deionized water until neutral, and then ground to 200 mesh to obtain pretreated bamboo fiber and pretreated sugarcane bagasse fiber.
[0043] S3. Premix the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, and water. Add chitosan and nanocellulose and stir at 700 rpm for 2.5 hours to obtain a mixed slurry. Adjust the pH of the slurry to 7.7. The weight ratio of the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, water, chitosan, and nanocellulose is 4.5:2.5:1.5:90:1.5:0.6. Form the mixed slurry using a wire mesh paper machine and hot-press dry it at 105℃ and 9MPa to obtain the cigarette carton material.
[0044] Example 2
[0045] This embodiment provides a method for preparing an environmentally friendly cigarette tow cardboard box material, the steps of which include:
[0046] S1. After crushing the tobacco stems to a particle size ≤2mm, soak them in a solution containing lignin-degrading enzyme and sonicate them at 40℃ for 5h. After centrifugation, steam explosion is performed at a pressure of 1MPa for 5min, then the pressure is rapidly reduced to 0.7MPa and maintained for 2min. Subsequently, they are soaked in an ethanol solution of silane coupling agent for 10h, and then heated to 110℃ and maintained for 50min. After filtration, washing, and air drying to a moisture content of 5%, the pretreated tobacco stems are obtained.
[0047] The preparation method of the solution containing lignin-degrading enzyme includes: taking 0.1M citric acid aqueous solution and 0.2M disodium hydrogen phosphate aqueous solution, mixing them at a volume ratio of 3:7, adjusting the pH to 4.5 to obtain a buffer solution, adding white-rot fungi, laccase, and xylanase to the buffer solution, and then adding polyethylene glycol 4000 and Tween 20 in sequence, and stirring magnetically for 25 minutes until completely dissolved; the ratio of white-rot fungi, laccase, xylanase, polyethylene glycol 4000, Tween 20, and buffer solution is 1g:0.5g:0.8g:2g:1g:1L;
[0048] The laccase activity is 80,000 U / g; the xylanase activity is 60,000 U / g.
[0049] The method for preparing the ethanol solution of the silane coupling agent includes: dispersing the silane coupling agent KH550 and nano-silica in ethanol, wherein the weight ratio of the silane coupling agent KH550, nano-silica and ethanol is 0.5:0.2:100.
[0050] S2. Bamboo fiber and sugarcane bagasse fiber are soaked in a 5% NaOH aqueous solution for 20 hours, washed with deionized water until neutral, and then ground to 180 mesh to obtain pretreated bamboo fiber and pretreated sugarcane bagasse fiber.
[0051] S3. Premix the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, and water. Add chitosan and nanocellulose and stir for 2 hours at 600 rpm to obtain a mixed slurry. Adjust the pH of the slurry to 7.5. The weight ratio of the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, water, chitosan, and nanocellulose is 4:2:1:85:1:0.5. Form the mixed slurry using a wire paper machine and hot-press dry it at 100℃ and 8MPa to obtain the cigarette carton material.
[0052] Example 3
[0053] This embodiment provides a method for preparing an environmentally friendly cigarette tow cardboard box material, the steps of which include:
[0054] S1. After crushing the tobacco stems to a particle size ≤2mm, soak them in a solution containing lignin-degrading enzyme and sonicate them at 50℃ for 6h. After centrifugation, steam explosion is performed at a pressure of 2MPa for 7min, then the pressure is rapidly reduced to 0.9MPa and maintained for 3min. Subsequently, they are soaked in an ethanol solution of silane coupling agent for 12h, and then heated to 120℃ and maintained for 60min. After filtration, washing, and air drying to a moisture content of 5%, the pretreated tobacco stems are obtained.
[0055] The preparation method of the solution containing lignin-degrading enzyme includes: taking 0.2M citric acid aqueous solution and 0.3M disodium hydrogen phosphate aqueous solution, mixing them at a volume ratio of 4:6, adjusting the pH to 5 to obtain a buffer solution, adding white rot fungus, laccase and xylanase to the buffer solution, and then adding polyethylene glycol 4000 and Tween 20 in sequence, and stirring magnetically for 35 minutes until completely dissolved; the volume ratio of white rot fungus, laccase, xylanase, polyethylene glycol 4000, Tween 20 and buffer solution is 1.2g:0.7g:0.8g:2g:1g:1L;
[0056] The laccase activity is 100,000 U / g; the xylanase activity is 80,000 U / g.
[0057] The method for preparing the ethanol solution of the silane coupling agent includes: dispersing the silane coupling agent KH550 and nano silica in ethanol, wherein the weight ratio of the silane coupling agent KH550, nano silica and ethanol is 1:0.4:100.
[0058] S2. Bamboo fiber and sugarcane bagasse fiber are soaked in a 10% NaOH aqueous solution for 24 hours, washed with deionized water until neutral, and then ground to 220 mesh to obtain pretreated bamboo fiber and pretreated sugarcane bagasse fiber.
[0059] S3. Premix the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, and water. Add chitosan and nanocellulose and stir for 3 hours at 800 rpm to obtain a mixed slurry. Adjust the pH of the slurry to 8. The weight ratio of the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, water, chitosan, and nanocellulose is 5:3:2:95:2:0.7. Form the mixed slurry using a wire mesh paper machine and hot-press dry it at 110℃ and 10MPa to obtain the cigarette carton material.
[0060] Example 4
[0061] This embodiment provides a method for preparing an environmentally friendly cigarette tow cardboard box material, the steps of which include:
[0062] S1. After crushing the tobacco stems to a particle size ≤2mm, soak them in a solution containing lignin-degrading enzyme and sonicate them at 40℃ for 6h. After centrifugation, steam explosion is performed at a pressure of 1MPa for 7min, then the pressure is rapidly reduced to 0.7MPa and maintained for 3min. Subsequently, they are soaked in an ethanol solution of silane coupling agent for 10h, then heated to 120℃ and maintained for 50min. After filtration, washing, and air drying to a moisture content of 5%, the pretreated tobacco stems are obtained.
[0063] The preparation method of the solution containing lignin-degrading enzyme includes: taking 0.1M citric acid aqueous solution and 0.3M disodium hydrogen phosphate aqueous solution, mixing them at a volume ratio of 3:7, adjusting the pH to 4.5 to obtain a buffer solution, adding white-rot fungus, laccase, and xylanase to the buffer solution, and then adding polyethylene glycol 4000 and Tween 20 in sequence, and stirring magnetically for 35 minutes until completely dissolved; the ratio of white-rot fungus, laccase, xylanase, polyethylene glycol 4000, Tween 20, and buffer solution is 1g:0.5g:0.8g:3g:1.2g:1L;
[0064] The laccase activity is 80,000 U / g; the xylanase activity is 80,000 U / g.
[0065] The method for preparing the ethanol solution of the silane coupling agent includes: dispersing the silane coupling agent KH550 and nano silica in ethanol, wherein the weight ratio of the silane coupling agent KH550, nano silica and ethanol is 1:0.4:100.
[0066] S2. Bamboo fiber and sugarcane bagasse fiber are soaked in a 5% NaOH aqueous solution for 24 hours, washed with deionized water until neutral, and then ground to 180 mesh to obtain pretreated bamboo fiber and pretreated sugarcane bagasse fiber.
[0067] S3. Premix the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, and water. Add chitosan and nanocellulose and stir for 2 hours at 800 rpm to obtain a mixed slurry. Adjust the pH of the slurry to 8. The weight ratio of the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, water, chitosan, and nanocellulose is 4:3:2:95:2:0.7. Form the mixed slurry using a wire mesh paper machine and hot-press dry it at 100℃ and 10MPa to obtain the cigarette carton material.
[0068] Building upon Examples 1-4, the mixed slurry further includes cellulose diacetate.
[0069] The preparation method of this environmentally friendly cigarette tow cardboard box material includes the following steps:
[0070] S1. After crushing the tobacco stems, soak them in a solution containing lignin-degrading enzyme for ultrasonic reaction, centrifuge them and then steam-explode them. After that, soak them in an ethanol solution of silane coupling agent, filter, wash and air-dry them until the moisture content is ≤5% to obtain the pretreated tobacco stems.
[0071] S2. Bamboo fiber and sugarcane bagasse fiber are soaked and washed in NaOH aqueous solution and then ground to 180-220 mesh to obtain pretreated bamboo fiber and pretreated sugarcane bagasse fiber.
[0072] S3. Premix the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber and water, add chitosan, nanocellulose and diacetate fiber and stir to obtain a mixed pulp; after papermaking, environmentally friendly cigarette carton material is obtained.
[0073] The weight ratio of pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, water, chitosan, nanocellulose and diacetate fiber is (4-5):(2-3):(1-2):(85-95):(1-2):(0.5-0.7):(0.5-1).
[0074] Comparative Example 1
[0075] Based on Example 1, adjustments were made. Unlike Example 1, the pressure reduction to 0.8 MPa and the holding time for 2.5 min were omitted in Comparative Example 1.
[0076] Comparative Example 2
[0077] Based on Example 1, adjustments were made. Unlike Example 1, the steam explosion step was omitted in Comparative Example 2.
[0078] Comparative Example 3
[0079] Based on Example 1, adjustments were made. Unlike Example 1, nano-silica was not added to the ethanol solution of the silane coupling agent in Comparative Example 3.
[0080] Comparative Example 4
[0081] Based on Example 1, adjustments were made. The difference from Example 1 is that the impregnation step in the ethanol solution of the silane coupling agent was omitted in Comparative Example 4.
[0082] Comparative Example 5
[0083] Based on Example 1, adjustments were made. Unlike Example 1, KH570 silane was used instead of KH550 in Comparative Example 5.
[0084] Comparative Example 6
[0085] Based on Example 1, Comparative Example 6 was modified. Unlike Example 1, Comparative Example 6 only used a solution containing lignin-degrading enzymes prepared using white-rot fungi, and no laccase or xylanase was added during the preparation process.
[0086] The tobacco packaging materials prepared in Examples 1-4 and Comparative Examples 1-6 were tested:
[0087] 1. Tensile strength: Tested according to GB / T 12914-2018;
[0088] 2. Tear resistance: Tested according to ISO 1974;
[0089] 3. Puncture strength: Puncture strength shall be tested in accordance with GB / T 6544-2008.
[0090] 4. Degradation rate: Tested according to GB / T 39951-2021;
[0091] The test results are shown in Table 1.
[0092] Table 1 Test Results
[0093]
[0094]
[0095] Based on the above data, it can be seen that the tensile strength of Comparative Example 1 decreased by 17% and the degradation rate decreased by 6.5% compared to Example 1; the tensile strength of Comparative Example 2 was only 56% of that of Example 1, and the degradation rate decreased by 18.7%. This is because high-pressure explosion destroyed the lignin-carbohydrate complex, while low-pressure maintenance promoted the separation of fiber microfibrils; combined with ultrasound-assisted enzymatic hydrolysis, the lignin removal rate was improved; the puncture strength of Comparative Example 3 decreased by 8.7% compared to Example 1; the tear strength of Comparative Example 4 was only 70% of that of Example 1; the puncture strength of Comparative Example 5 was significantly lower than that of Example 1, indicating insufficient interfacial bonding. This is because the composite modification of KH550 and nano-SiO2 enhanced the interface through a dual mechanism of chemical bonding and physical anchoring. Among them, the amino groups of KH550 formed covalent bonds with the hydroxyl groups of cellulose, and nano-SiO2 filled the defects on the fiber surface, improving the puncture resistance; the epoxy group activity of KH570 was low, resulting in a decrease in the fiber-matrix interfacial bonding strength; the degradation rate of Comparative Example 6 decreased by 31% and the tensile strength decreased by 33% compared to Example 1. This is because the synergistic effect of the ternary enzyme compound achieved efficient degradation of lignin.
[0096] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention; those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention; and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.
Claims
1. A method for preparing an environmentally friendly cigarette tow carton material, characterized in that the steps include... include: S1. After crushing the tobacco stems, soak them in a solution containing lignin-degrading enzyme for ultrasonic reaction, centrifuge, and then perform steam explosion. The steam explosion step includes: performing steam explosion at a pressure of 1-2 MPa for 5-7 minutes, then rapidly reducing the pressure to 0.7-0.9 MPa and maintaining it for 2-3 minutes, followed by immersion in an ethanol solution of silane coupling agent. The ethanol solution of silane coupling agent is prepared by dispersing silane coupling agent KH550 and nano-silica in ethanol, wherein the weight ratio of silane coupling agent KH550, nano-silica, and ethanol is (0.5-1):(0.2-0.4):
100. After filtration, washing, and air drying until the moisture content is ≤5%, the pretreated tobacco stems are obtained. S2. Bamboo fiber and sugarcane bagasse fiber are soaked and washed in NaOH aqueous solution and then ground to 180-220 mesh to obtain pretreated bamboo fiber and pretreated sugarcane bagasse fiber. S3. Premix the pretreated tobacco stems, pretreated bamboo fiber, pretreated sugarcane bagasse fiber and water, add chitosan and nanocellulose and stir to obtain a mixed pulp; after papermaking, environmentally friendly cigarette carton material is obtained.
2. The method for preparing an environmentally friendly cigarette tow carton material according to claim 1, characterized in that, The preparation method of the lignin-degrading enzyme solution includes: taking 0.1-0.2M citric acid aqueous solution and 0.2-0.3M disodium hydrogen phosphate aqueous solution, mixing them at a volume ratio of 3-4:6-7, adjusting the pH to 4.5-5 to obtain a buffer solution, adding white rot fungus, laccase and xylanase to the buffer solution, and then adding polyethylene glycol 4000 and Tween 20 in sequence, and stirring magnetically for 25-35 minutes until completely dissolved.
3. The method for preparing an environmentally friendly cigarette tow carton material according to claim 2, characterized in that, The ratio of the amount of white rot fungus, laccase, xylanase, polyethylene glycol 4000, Tween 20 and buffer solution is (1-1.2)g:(0.5-0.7)g:(0.8-1)g:(2-3)g:(1-1.2)g:1L.
4. The method for preparing an environmentally friendly cigarette tow carton material according to claim 2, characterized in that, The laccase activity is 80,000-100,000 U / g; the xylanase activity is 60,000-80,000 U / g.
5. The method for preparing an environmentally friendly cigarette tow carton material according to claim 1, characterized in that, The weight ratio of the pretreated tobacco stems, pretreated bamboo fiber, pretreated bagasse fiber, water, chitosan and nanocellulose is (4-5):(2-3):(1-2):(85-95):(1-2):(0.5-0.7).
6. The method for preparing an environmentally friendly cigarette tow carton material according to claim 1, characterized in that, The mixed slurry also includes cellulose diacetate.
7. An environmentally friendly cigarette tow cardboard box material, characterized in that, It is prepared using the method for preparing environmentally friendly cigarette cardboard box material according to any one of claims 1-6.
8. An environmentally friendly cigarette cardboard box, made from the environmentally friendly cigarette cardboard box material prepared by the preparation method according to any one of claims 1-6 or the environmentally friendly cigarette cardboard box material according to claim 7, characterized in that, The environmentally friendly cigarette carton includes a separate carton top cover (1), a carton middle body (2), and a carton bottom cover (3).