Body paper based on biomass conversion material and preparation method thereof
By reacting modified biomass fibers with modifying reagents and modifying them with inorganic fillers, and combining them with adhesive components and other additives, the problem of poor compatibility between biomass fibers and auxiliary materials has been solved, and high-performance, low-cost biomass conversion material base paper has been prepared, which is suitable for packaging, printing and other fields.
Patent Information
- Application Number
- CN202610265302.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-05
- Publication Date
- 2026-05-15
AI Technical Summary
Existing base paper based on biomass conversion materials suffers from poor compatibility between biomass fibers and auxiliary materials, making it difficult for additives to exert their effects, increasing the difficulty and cost of preparation, and having insufficient performance and limited application scope.
Modified biomass fibers are prepared by reacting modified biomass fibers with modifying reagents, and inorganic fillers are modified. Combined with adhesive components, defoamers, preservatives and softeners, a stable composite system is formed to improve the fiber bonding strength and mechanical properties.
The prepared base paper has good green environmental protection and biodegradability, excellent mechanical properties and water resistance, wide range of applications, low cost, and is suitable for industrial production.
Smart Images
Figure CN122039481A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of papermaking technology, and in particular to a base paper based on biomass conversion materials and its preparation method. Background Technology
[0002] Paper is a basic raw material for packaging, printing and other fields. Traditional production mainly relies on wood fiber, but wood resources have a long renewable cycle and high cost. Long-term mining not only damages the ecology, but also makes it difficult to adapt to the needs of green and low-carbon development.
[0003] To address the aforementioned contradictions, the industry has gradually adopted agricultural waste such as crop straw and bamboo hemp, as well as forestry by-products, to produce biomass conversion materials for use in paper production. This approach not only enables the high-value utilization of waste and reduces reliance on wood, but also reduces pollution and promotes environmental friendliness, thus gradually becoming a research hotspot in the industry.
[0004] Currently, some progress has been made in the preparation of base paper based on biomass conversion materials, but some shortcomings still limit its industrial application. These shortcomings are mainly: first, the biomass conversion materials have poor compatibility with auxiliary materials, making it difficult for the additives to play their role, increasing the difficulty and cost of preparation; second, the prepared base paper often has various performance deficiencies, limiting its application range.
[0005] Therefore, developing an environmentally friendly, efficient, and high-performance base paper and its preparation method is of great practical significance and industrial value. Summary of the Invention
[0006] To address the shortcomings of existing technologies, this application provides a base paper based on biomass conversion materials and its preparation method. This study prepares modified biomass fibers by reacting biomass fibers with modifying reagents, and then modifies inorganic fillers to obtain modified filler components. Subsequently, these two modified materials are combined with adhesive components, defoamers, preservatives, and softeners to successfully develop a base paper based on biomass conversion materials. The main raw material of this base paper is derived from biomass conversion materials, exhibiting good environmental friendliness and biodegradability. It also demonstrates excellent mechanical and water resistance properties, possessing high potential for widespread application.
[0007] To achieve the above objectives, this application adopts the following technical solution:
[0008] In a first aspect, this application provides a base paper based on biomass conversion materials, the raw materials of which include modified biomass fibers, adhesive components, modified filler components, defoamers, preservatives and softeners; the modified biomass fibers are obtained by reacting biomass fibers with modifying reagents; the modifying reagents include any one of 4-carboxyphenylacetic acid and 3-(4-carboxyphenyl)propionic acid; the modified filler components are obtained by modifying inorganic fillers.
[0009] In the raw materials of the base paper provided in this application, the modifying reagents 4-carboxyphenylacetic acid and 3-(4-carboxyphenyl)propionic acid both contain dicarboxyl functional groups and benzene rings. One of the carboxyl groups undergoes an esterification reaction with the hydroxyl groups on the surface of the biomass fiber, realizing carboxyl grafting to obtain modified biomass fiber; the other free carboxyl group can form hydrogen bonds or covalent bonds with active groups such as hydroxyl groups in other raw material components, significantly improving the bonding strength between the modified biomass fiber and other raw material components, and improving the paper strength. Moreover, introducing a benzene ring structure into the modified biomass fiber, which is the main component of the base paper, can further enhance the mechanical properties and water resistance of the obtained base paper.
[0010] In addition, after the inorganic filler in the raw material is modified by the titanate coupling agent, the surface becomes more organic-friendly, so it can be more uniformly dispersed in the three-dimensional network of biomass fiber and form a stable composite system with fiber and adhesive components. This also improves the mechanical properties of the resulting base paper and avoids problems such as filler shedding and excessively high porosity of paper caused by poor interfacial compatibility.
[0011] Defoamers, preservatives, and softeners are specifically designed to address issues such as foaming, mildew, and insufficient softness that may occur during the pulping / paper-making process. They are compatible with modified biomass fibers, adhesive components, and modified filler components, and do not compromise the stability of the main system.
[0012] In one feasible implementation, the mass ratio of the modified biomass fiber, adhesive component, modified filler component, defoamer, preservative and softener is (70-80): (5-8): (12-20): (0.1-1): (0.1-0.5): (0.5-2).
[0013] In this application, by controlling the proportions of each raw material, the modified biomass fiber is used as the core skeleton of the base paper, the adhesive component is used in sufficient quantity to achieve bonding between the components, the modified filler component improves the smoothness and whiteness of the finished base paper without reducing its mechanical properties, and other functional additives are used in trace amounts to perform their corresponding functions. This fixed mass ratio ensures that the resulting base paper has stable performance and is repeatable for industrial production.
[0014] In one feasible implementation, the biomass fiber includes any one or more of straw fiber, corn cob fiber, and bagasse fiber.
[0015] The biomass fibers used in this application are all derived from agricultural and forestry waste or byproducts, belonging to biomass conversion materials. These materials are widely available and inexpensive, which can significantly reduce the raw material cost of paper production and realize the resource utilization of waste. Moreover, the surface of these fibers is rich in hydroxyl groups, which can undergo esterification reactions with the modifying reagents used in this application, and the modification process is simple. In addition to straw fiber, corn cob fiber, and bagasse fiber, other biomass fibers such as cotton and linen fibers can also be used.
[0016] In one feasible implementation, the adhesive component includes an adhesive material and an auxiliary adhesive material; the adhesive material includes any one or more of pregelatinized starch, rosin, pectin, and gum arabic; the auxiliary adhesive material includes any one or two of alkenyl succinic anhydride and alkyl ketene dimers; the amount of the auxiliary adhesive material is 5-10% of the total mass of the adhesive material.
[0017] When adhesive materials and auxiliary adhesive materials are combined in an optimized ratio, the adhesive effect can be greatly improved, and the other components can be fully compatible with biomass fibers.
[0018] In one feasible implementation, the defoamer comprises any one or more of polydimethylsiloxane, glycerol polyether, and trimethylolpropane polyether; the preservative comprises any one or two of methylisothiazolinone and methylchloroisothiazolinone; and the softener comprises any one or more of dihydrogenated tallow dimethylammonium chloride, dodecyltrimethylammonium chloride, and polydiallyl dimethylammonium chloride.
[0019] The functional additives used in this application have good compatibility with other raw materials, are not prone to chemical reactions, and do not damage the main structure and properties of the prepared base paper.
[0020] Secondly, this application provides a method for preparing base paper based on biomass conversion materials, comprising the following steps:
[0021] S1. After crushing the biomass fiber, add it to deionized water, and then pulp it using a pulping machine to prepare a biomass fiber mixture.
[0022] S2. Add the modifying agent to the biomass fiber mixture, then adjust the pH of the system, stir the reaction at a constant temperature for the first time, and after the reaction is completed, cool the system to room temperature, filter and wash the filter cake with deionized water.
[0023] S3. Dry the washed filter cake to constant weight, crush and grind it to obtain modified biomass fiber, and seal it for later use.
[0024] S4. Add the inorganic filler to the high-speed mixer, start stirring at the set temperature, and add the titanate coupling agent in the form of spray while stirring. Then continue stirring under the same conditions for a second time. The modified filler component is then discharged and sealed for later use.
[0025] S5. Add the modified biomass fiber to the slurry mixing tank, then add deionized water to prepare the modified biomass fiber slurry. Start stirring at room temperature, and then add the adhesive component and the modified filler component in sequence while stirring. After each component is added, continue stirring for a third time.
[0026] S6. Finally, after adding defoamer, preservative and softener in sequence, continue stirring for four hours to obtain the paper forming pulp.
[0027] S7. The prepared base paper forming pulp is fed into a wire paper machine for papermaking, and after further pressing and dewatering, it is dried and post-processed to obtain the base paper based on biomass conversion materials.
[0028] In one feasible implementation, in S1, the average particle size of the pulverized biomass fiber ranges from 40 to 60 mesh; and the beating degree of the biomass fiber mixture is 35-45%.
[0029] After being pulverized, biomass fibers exhibit better dispersibility, with no coarse residue and less tendency to agglomerate or smear, thus providing a larger contact area in subsequent modification reactions. A freeness of 35-45% enables moderate fiber swelling and filament separation, which not only improves the efficiency of the modification reaction but also ensures the entanglement of fibers, providing basic mechanical strength for paper production.
[0030] In one feasible implementation, in S2, the system pH is 4.0-5.0; the reaction temperature is 60-70°C; the stirring rate is 300-400 rpm; the first duration is 2-4 h; and the filter cake is washed with deionized water until the pH of the washing liquid is 7.0-7.5.
[0031] The pH control of the system can avoid the hydrolysis and fragmentation of biomass fibers due to excessively low acidity, while ensuring high conversion and grafting rates in the modification reaction. Appropriate reaction temperature, stirring rate, and duration allow the modifying reagent to fully contact the biomass fibers, resulting in high mass transfer efficiency and a complete modification reaction.
[0032] In one feasible implementation, in S4, the inorganic filler includes any one or more of calcium carbonate, kaolin, and talc; the average particle size of the inorganic filler is in the range of 2-10 μm; the set temperature is 70-80℃; the stirring speed is 900-1200 rpm; the titanate coupling agent includes any one of triisostearyl titanate isopropyl, isopropyltrioleyloxytitanate, and isopropyltris(dioctylpyrophosphateoxy)titanate; the amount of titanate coupling agent added is 1-5% of the mass of the inorganic filler; and the second duration is 10-20 min.
[0033] High temperature and high speed stirring conditions allow the titanate coupling agent to quickly and uniformly coat the surface of the inorganic filler, and it is not easy to generate excessive agglomeration, thereby achieving a better modification effect and enabling the modified filler component to be better dispersed with the modified biomass fiber and other components.
[0034] In one feasible implementation, in S5, the mass of the deionized water is 3-5 times the mass of the modified biomass fiber; the stirring rate is 400-500 rpm; the third duration is 20-30 min; and in S6, the fourth duration is 10-15 min.
[0035] By adjusting the above parameters, we can ensure that the components are evenly dispersed, while avoiding excessive foam regeneration and fiber entanglement caused by prolonged stirring. Ultimately, this will stabilize the performance of the forming pulp and make the appearance and performance of the paper produced uniform and stable.
[0036] Beneficial technical effects:
[0037] In the biomass-based conversion material-based base paper prepared in this application, modified biomass fibers are obtained by reacting modified reagents 4-carboxyphenylacetic acid and 3-(4-carboxyphenyl)propionic acid with biomass fibers. All the modified reagents used contain dicarboxyl functional groups and benzene rings. One carboxyl group undergoes esterification with the hydroxyl groups on the surface of the biomass fibers, achieving carboxyl grafting; the other free carboxyl group can form hydrogen bonds or covalent bonds with other active groups such as hydroxyl groups in other raw material components, significantly improving the bonding strength between the modified biomass fibers and other raw material components, and improving the paper strength. Furthermore, introducing a benzene ring structure into the modified biomass fibers, which are the main component of the base paper, can further enhance the mechanical properties and water resistance of the resulting base paper. In addition, by modifying the inorganic filler with a titanate coupling agent, the obtained modified filler components can be more uniformly dispersed in the three-dimensional network of biomass fibers, forming a stable composite system with the fibers and adhesive components, which also improves the mechanical properties of the resulting base paper and avoids problems such as filler detachment and excessively high paper porosity caused by poor interfacial compatibility. The main raw material of the paper provided in this application comes from biomass conversion materials, which have good green environmental protection and biodegradability, and also perform well in terms of mechanical properties and water resistance. Attached Figure Description
[0038] Figure 1 This is a physical image of the base paper based on biomass conversion materials provided in Embodiment 1 of this application.
[0039] Figure 2 This is a schematic diagram of the preparation method of base paper based on biomass conversion materials provided in this application. Detailed Implementation
[0040] To facilitate understanding of the content described in this application, the technical solutions described herein are further explained below with reference to specific embodiments; however, this application is not limited thereto. All equivalent transformations or simple substitutions made based on the substantive content of this application should fall within the protection scope of this application.
[0041] The singular forms “for,” “or,” “a,” “any,” and “the” used in this application are intended to include the plural forms unless the context clearly indicates otherwise.
[0042] The following will describe in detail the preparation method of the base paper based on biomass conversion materials provided in this application, with reference to different embodiments.
[0043] Example 1
[0044] like Figure 2 As shown, a method for preparing base paper based on biomass conversion materials includes the following steps:
[0045] S1. Crush the straw fiber to 40 mesh, then add it to deionized water, and pulp it using a pulping machine to prepare a biomass fiber mixture with a pulping degree of 35%.
[0046] S2. Add 4-carboxyphenylacetic acid to the biomass fiber mixture, then adjust the pH of the system to 4.0, stir at 400 rpm for 2 h at 60 °C, after the reaction is completed, cool the system to room temperature, filter and wash the filter cake with deionized water until the pH of the washing liquid is 7.0.
[0047] S3. Dry the washed filter cake to constant weight, crush and grind it to obtain modified biomass fiber, and seal it for later use.
[0048] S4. Add calcium carbonate with an average particle size of 2μm to a high-speed mixer, start stirring at 70℃, and add triisostearyl titanate isopropyl ester (1% of the mass of calcium carbonate) in the form of spray while stirring at a stirring rate of 1200rpm. Then continue stirring under the same conditions for 10min. The modified filler component is then discharged and sealed for later use.
[0049] S5. Add the modified biomass fiber to the slurry preparation tank, and then add 3 times the mass of the modified biomass fiber with deionized water to prepare the modified biomass fiber slurry. Start stirring at room temperature, and then add the adhesive component and the modified filler component in sequence while stirring at a stirring speed of 400 rpm. Continue stirring for 30 minutes after each component is added.
[0050] The adhesive component includes an adhesive material and an auxiliary adhesive material. The adhesive material is pregelatinized starch, and the auxiliary adhesive material is alkenyl succinic anhydride. The amount of the auxiliary adhesive material is 5% of the total mass of the adhesive material.
[0051] S6. Finally, add defoamer, preservative and softener in sequence and continue stirring for 10 minutes to obtain the paper forming pulp.
[0052] The defoamer is polydimethylsiloxane, the preservative is methylisothiazolinone, and the softener is dihydrotallow dimethylammonium chloride.
[0053] S7. The prepared base paper forming pulp is fed into a fourdrinier paper machine for further pressing and dewatering, followed by drying and post-treatment to obtain the base paper based on biomass conversion materials. The physical product is as follows: Figure 1 As shown.
[0054] In the preparation process of the above-mentioned base paper based on biomass conversion materials, the mass ratio of the modified biomass fiber, adhesive component, modified filler component, defoamer, preservative and softener is 72:5:20:0.5:0.5:2.
[0055] Example 2
[0056] like Figure 2 As shown, a method for preparing base paper based on biomass conversion materials includes the following steps:
[0057] S1. Crush corn cob fiber to 60 mesh, add it to deionized water, and pulp it using a pulper to prepare a biomass fiber mixture with a pulping degree of 45%.
[0058] S2. Add 3-(4-carboxyphenyl)propionic acid to the biomass fiber mixture, then adjust the pH of the system to 5.0, stir at 300 rpm for 4 h at 70 °C. After the reaction is complete, cool the system to room temperature, filter and wash the filter cake with deionized water until the pH of the washing liquid is 7.2.
[0059] S3. Dry the washed filter cake to constant weight, crush and grind it to obtain modified biomass fiber, and seal it for later use.
[0060] S4. Add kaolin with an average particle size of 4μm to a high-speed mixer, start stirring at 80℃, and add isopropyltrioleoyl oxytitanate (5% of the mass of kaolin) in the form of spray while stirring at a stirring rate of 900rpm. Then continue stirring under the same conditions for 20min. The modified filler component is then discharged and sealed for later use.
[0061] S5. Add the modified biomass fiber to the slurry preparation tank, and then add 5 times the mass of the modified biomass fiber with deionized water to prepare the modified biomass fiber slurry. Start stirring at room temperature, and then add the adhesive component and the modified filler component in sequence while stirring at a stirring speed of 500 rpm. Continue stirring for 20 minutes after each component is added.
[0062] The adhesive component includes an adhesive material and an auxiliary adhesive material. The adhesive material is rosin, and the auxiliary adhesive material is an alkyl ketene dimer. The amount of the auxiliary adhesive material is 10% of the total mass of the adhesive material.
[0063] S6. Finally, add defoamer, preservative and softener in sequence and continue stirring for 15 minutes to obtain the paper forming pulp.
[0064] The defoamer is glycerol polyether, the preservative is methylchloroisothiazolinone, and the softener is dodecyltrimethylammonium chloride;
[0065] S7. The prepared base paper forming pulp is fed into a wire paper machine for papermaking, and after further pressing and dewatering, it is dried and post-processed to obtain the base paper based on biomass conversion materials.
[0066] In the preparation process of the above-mentioned base paper based on biomass conversion materials, the mass ratio of the modified biomass fiber, adhesive component, modified filler component, defoamer, preservative and softener is 75:7:15:0.8:0.2:2.
[0067] Example 3
[0068] like Figure 2 As shown, a method for preparing base paper based on biomass conversion materials includes the following steps:
[0069] S1. Crush bagasse fiber to 50 mesh, add it to deionized water, and pulp it using a pulper to prepare a biomass fiber mixture with a freeness of 40%.
[0070] S2. Add 4-carboxyphenylacetic acid to the biomass fiber mixture, then adjust the pH of the system to 4.5, stir at 350 rpm for 3 h at 65 °C. After the reaction is complete, cool the system to room temperature, filter and wash the filter cake with deionized water until the pH of the washing liquid is 7.3.
[0071] S3. Dry the washed filter cake to constant weight, crush and grind it to obtain modified biomass fiber, and seal it for later use.
[0072] S4. Add talc powder with an average particle size of 5μm to a high-speed mixer, start stirring at 75℃, and add isopropyl tris(dioctyl pyrophosphoryloxy) titanate (3% of the mass of talc powder) in the form of spray while stirring at a stirring rate of 1000rpm. Then continue stirring under the same conditions for 15min. The modified filler component is then discharged and sealed for later use.
[0073] S5. Add the modified biomass fiber to the slurry preparation tank, and then add 4 times the mass of the modified biomass fiber with deionized water to prepare the modified biomass fiber slurry. Start stirring at room temperature, and then add the adhesive component and the modified filler component in sequence while stirring at a stirring speed of 450 rpm. Continue stirring for 25 minutes after each component is added.
[0074] The adhesive component includes an adhesive material and an auxiliary adhesive material. The adhesive material is pectin, and the auxiliary adhesive material is alkenyl succinic anhydride. The amount of the auxiliary adhesive material is 7% of the total mass of the adhesive material.
[0075] S6. Finally, add defoamer, preservative and softener in sequence and continue stirring for 12 minutes to obtain the paper forming pulp.
[0076] The defoamer is trimethylolpropane polyether, the preservative is methylisothiazolinone, and the softener is polydiallyl dimethylammonium chloride.
[0077] S7. The prepared base paper forming pulp is fed into a wire paper machine for papermaking, and after further pressing and dewatering, it is dried and post-processed to obtain the base paper based on biomass conversion materials.
[0078] In the preparation process of the base paper based on biomass conversion materials, the mass ratio of the modified biomass fiber, adhesive component, modified filler component, defoamer, preservative and softener is 78:6:13:0.8:0.2:2.
[0079] Example 4
[0080] like Figure 2 As shown, a method for preparing base paper based on biomass conversion materials includes the following steps:
[0081] S1. Crush the straw fiber to 45 mesh, then add it to deionized water, and pulp it using a pulping machine to prepare a biomass fiber mixture with a pulping degree of 38%.
[0082] S2. Add 3-(4-carboxyphenyl)propionic acid to the biomass fiber mixture, then adjust the pH of the system to 4.2, stir the mixture at 300 rpm at 60°C for 2.5 h. After the reaction is complete, cool the system to room temperature, filter it, and wash the filter cake with deionized water until the pH of the washing liquid is 7.5.
[0083] S3. Dry the washed filter cake to constant weight, crush and grind it to obtain modified biomass fiber, and seal it for later use.
[0084] S4. Add talc powder with an average particle size of 6μm to a high-speed mixer, start stirring at 70℃, and add triisostearyl titanate isopropyl ester (2% of the mass of talc powder) in the form of spray while stirring at a stirring rate of 1050rpm. Then continue stirring under the same conditions for 12min. The modified filler component is then discharged and sealed for later use.
[0085] S5. Add the modified biomass fiber to the slurry mixing tank, then add 3.5 times the mass of the modified biomass fiber and deionized water to prepare the modified biomass fiber slurry. Start stirring at room temperature, and then add the adhesive component and modified filler component in sequence while stirring at a stirring speed of 420 rpm. Continue stirring for 22 minutes after each component is added.
[0086] The adhesive component includes an adhesive material and an auxiliary adhesive material. The adhesive material is gum arabic, and the auxiliary adhesive material is an alkyl ketene dimer. The amount of the auxiliary adhesive material is 6% of the total mass of the adhesive material.
[0087] S6. Finally, add defoamer, preservative and softener in sequence and continue stirring for 11 minutes to obtain the paper forming pulp.
[0088] The defoamer is polydimethylsiloxane, the preservative is methylchloroisothiazolinone, and the softener is dihydrotallow dimethylammonium chloride.
[0089] S7. The prepared base paper forming pulp is fed into a wire paper machine for papermaking, and after further pressing and dewatering, it is dried and post-processed to obtain the base paper based on biomass conversion materials.
[0090] In the preparation process of the above-mentioned base paper based on biomass conversion materials, the mass ratio of the modified biomass fiber, adhesive component, modified filler component, defoamer, preservative and softener is 73:6:18:1.0:0.3:1.7.
[0091] Example 5
[0092] like Figure 2 As shown, a method for preparing base paper based on biomass conversion materials includes the following steps:
[0093] S1. Crush corn cob fiber to 55 mesh, add it to deionized water, and pulp it using a pulper to prepare a biomass fiber mixture with a pulping degree of 42%.
[0094] S2. Add 4-carboxyphenylacetic acid to the biomass fiber mixture, then adjust the pH of the system to 4.8, stir at 360 rpm at 68°C for 3.5 h. After the reaction is complete, cool the system to room temperature, filter and wash the filter cake with deionized water until the pH of the washing liquid is 7.4.
[0095] S3. Dry the washed filter cake to constant weight, crush and grind it to obtain modified biomass fiber, and seal it for later use.
[0096] S4. Add kaolin with an average particle size of 8μm to a high-speed mixer, start stirring at 78℃, and add isopropyl tris(dioctyl pyrophosphoryloxy) titanate (4% of the mass of talc powder) in the form of spray while stirring at a stirring rate of 1100rpm. Then continue stirring under the same conditions for 18min. The modified filler component is then discharged and sealed for later use.
[0097] S5. Add the modified biomass fiber to the slurry preparation tank, and then add 4.5 times the mass of the modified biomass fiber deionized water to prepare the modified biomass fiber slurry. Start stirring at room temperature, and then add the adhesive component and the modified filler component in sequence while stirring at a stirring speed of 480 rpm. Continue stirring for 24 minutes after each component is added.
[0098] The adhesive component includes an adhesive material and an auxiliary adhesive material. The adhesive material is pregelatinized starch, and the auxiliary adhesive material is alkenyl succinic anhydride. The amount of the auxiliary adhesive material is 9% of the total mass of the adhesive material.
[0099] S6. Finally, add defoamer, preservative and softener in sequence and continue stirring for 11 minutes to obtain the paper forming pulp.
[0100] The defoamer is glycerol polyether, the preservative is methylisothiazolinone, and the softener is dodecyltrimethylammonium chloride;
[0101] S7. The prepared base paper forming pulp is fed into a wire paper machine for papermaking, and after further pressing and dewatering, it is dried and post-processed to obtain the base paper based on biomass conversion materials.
[0102] In the preparation process of the above-mentioned base paper based on biomass conversion materials, the mass ratio of the modified biomass fiber, adhesive component, modified filler component, defoamer, preservative and softener is 77:5:15:0.6:0.4:2.
[0103] Example 6
[0104] like Figure 2 As shown, a method for preparing base paper based on biomass conversion materials includes the following steps:
[0105] S1. Crush bagasse fiber to 40 mesh, add it to deionized water, and pulp it using a pulper to prepare a biomass fiber mixture with a freeness of 45%.
[0106] S2. Add 3-(4-carboxyphenyl)propionic acid to the biomass fiber mixture, then adjust the pH of the system to 4.0, stir at 300 rpm for 4 h at 70 °C, after the reaction is completed, cool the system to room temperature, filter and wash the filter cake with deionized water until the pH of the washing liquid is 7.1.
[0107] S3. Dry the washed filter cake to constant weight, crush and grind it to obtain modified biomass fiber, and seal it for later use.
[0108] S4. Add calcium carbonate with an average particle size of 10 μm to a high-speed mixer, start stirring at 70°C, and add isopropyltrioleoyl oxytitanate (5% of the mass of talc powder) to it in the form of spray while stirring at a stirring rate of 1200 rpm. Then continue stirring under the same conditions for 10 min. The modified filler component is then discharged and sealed for later use.
[0109] S5. Add the modified biomass fiber to the slurry preparation tank, and then add 5 times the mass of the modified biomass fiber with deionized water to prepare the modified biomass fiber slurry. Start stirring at room temperature, and then add the adhesive component and the modified filler component in sequence while stirring at a stirring speed of 500 rpm. Continue stirring for 20 minutes after each component is added.
[0110] The adhesive component includes an adhesive material and an auxiliary adhesive material. The adhesive material is rosin, and the auxiliary adhesive material is an alkyl ketene dimer. The amount of the auxiliary adhesive material is 8% of the total mass of the adhesive material.
[0111] S6. Finally, add defoamer, preservative and softener in sequence and continue stirring for 11 minutes to obtain the paper forming pulp.
[0112] The defoamer is trimethylolpropane polyether, the preservative is methylchloroisothiazolinone, and the softener is polydiallyldimethylammonium chloride.
[0113] S7. The prepared base paper forming pulp is fed into a wire paper machine for papermaking, and after further pressing and dewatering, it is dried and post-processed to obtain the base paper based on biomass conversion materials.
[0114] In the preparation process of the above-mentioned base paper based on biomass conversion materials, the mass ratio of the modified biomass fiber, adhesive component, modified filler component, defoamer, preservative and softener is 80:5:12:0.5:0.5:2.
[0115] Comparative Example 1
[0116] This comparative example provides a method for preparing base paper based on biomass conversion materials. The difference from Example 1 is that the biomass fibers used in the base paper based on biomass conversion materials prepared in this comparative example are not modified, while other process parameters and operating steps are exactly the same as in Example 1.
[0117] Comparative Example 2
[0118] This comparative example provides a method for preparing base paper based on biomass conversion materials. The difference from Example 1 is that the inorganic filler used in the base paper based on biomass conversion materials prepared in this comparative example is not modified, while other process parameters and operating steps are exactly the same as in Example 1.
[0119] Comparative Example 3
[0120] This comparative example provides a method for preparing base paper based on biomass conversion materials. The difference from Example 1 is that the biomass fibers and inorganic fillers used in the base paper based on biomass conversion materials prepared in this comparative example are not modified, while other process parameters and operating steps are exactly the same as in Example 1.
[0121] The mechanical properties of the biomass-converted base paper were demonstrated by testing its tensile strength in each embodiment and comparative example; its water resistance was demonstrated by testing its water contact angle in each embodiment and comparative example. The test results of the biomass-converted base paper prepared in each embodiment and comparative example are statistically shown in Table 1.
[0122] Table 1. Test results of the biomass conversion material-based base paper prepared in the examples and comparative examples.
[0123]
[0124] As shown in Table 1, the tensile strength and water resistance of the biomass conversion-based base paper prepared in Examples 1 to 6 are better than those of the biomass conversion-based base paper prepared in Comparative Examples 1 to 3.
[0125] The main reason is that in the biomass-based base paper prepared in Examples 1 to 6, modified biomass fibers were obtained by reacting the modified reagents 4-carboxyphenylacetic acid and 3-(4-carboxyphenyl)propionic acid with biomass fibers. The modified reagents used all contain dicarboxyl functional groups and benzene rings. One carboxyl group undergoes esterification with the hydroxyl groups on the surface of the biomass fibers, achieving carboxyl grafting; the other free carboxyl group can form hydrogen bonds or covalent bonds with other active groups such as hydroxyl groups in the raw material components, significantly improving the bonding strength between the modified biomass fibers and other raw material components, and improving the paper strength. Furthermore, introducing a benzene ring structure into the modified biomass fibers, which are the main component of the base paper, can further enhance the mechanical properties and water resistance of the resulting base paper. Furthermore, by modifying the inorganic filler with a titanate coupling agent, the resulting modified filler component can be more uniformly dispersed in the three-dimensional network of biomass fibers, forming a stable composite system with the fibers and adhesive components. This also improves the mechanical properties of the resulting base paper and avoids problems such as filler detachment and excessively high paper porosity caused by poor interfacial compatibility. The base paper provided in this application is mainly derived from biomass conversion materials, exhibiting good green environmental protection and biodegradability, while also demonstrating excellent mechanical and water resistance properties.
[0126] In contrast, the base paper prepared in Comparative Example 1 did not use modified biomass fibers, thus lacking the grafting of carboxyl groups and benzene ring structures. As a result, the binding force of each component decreased and the hydrophobicity was insufficient. Consequently, the tensile strength was significantly lower than that of the Example, and the water contact angle also decreased significantly.
[0127] The base paper prepared in Comparative Example 2 did not use modified inorganic fillers, resulting in uneven dispersion and easy shedding of the fillers. However, the modified biomass fibers still played a part. Therefore, although the tensile strength and water contact angle were reduced, the overall performance was still the best among the comparative examples.
[0128] The base paper prepared in Comparative Example 3 did not use modified biomass fibers or modified inorganic fillers, and for the same reasons mentioned above, its overall performance was the worst.
[0129] The above results demonstrate and describe the basic principles and main features of this application, as well as its advantages.
[0130] Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this application as claimed. The scope of protection of this application is defined by the equivalents of the appended claims.
Claims
1. A base paper based on biomass conversion materials, characterized in that, The raw materials used include modified biomass fibers, adhesive components, modified filler components, defoamers, preservatives, and softeners; the modified biomass fibers are obtained by reacting biomass fibers with modifying reagents; the modifying reagents include any one of 4-carboxyphenylacetic acid and 3-(4-carboxyphenyl)propionic acid; the modified filler components are obtained by modifying inorganic fillers.
2. The base paper based on biomass conversion materials according to claim 1, characterized in that, The mass ratio of the modified biomass fiber, adhesive component, modified filler component, defoamer, preservative and softener is (70-80): (5-8): (12-20): (0.1-1): (0.1-0.5): (0.5-2).
3. The base paper based on biomass conversion materials according to claim 1, characterized in that, The biomass fiber includes any one or more of straw fiber, corn cob fiber, and bagasse fiber.
4. The base paper based on biomass conversion materials according to claim 1, characterized in that, The adhesive component includes adhesive materials and auxiliary adhesive materials; the adhesive materials include any one or more of pregelatinized starch, rosin, pectin and gum arabic; the auxiliary adhesive materials include any one or two of alkenyl succinic anhydride and alkyl ketene dimers; the amount of the auxiliary adhesive materials is 5-10% of the total mass of the adhesive materials.
5. The base paper based on biomass conversion materials according to claim 1, characterized in that, The defoamer includes any one or more of polydimethylsiloxane, glycerol polyether, and trimethylolpropane polyether; the preservative includes any one or two of methylisothiazolinone and methylchloroisothiazolinone; and the softener includes any one or more of dihydrogenated tallow dimethylammonium chloride, dodecyltrimethylammonium chloride, and polydiallyl dimethylammonium chloride.
6. A method for preparing a base paper based on biomass conversion materials as described in any one of claims 1-5, comprising the following steps: S1. After crushing the biomass fiber, add it to deionized water, and then pulp it using a pulping machine to prepare a biomass fiber mixture. S2. Add the modifying agent to the biomass fiber mixture, then adjust the pH of the system, stir the reaction at a constant temperature for the first time, and after the reaction is completed, cool the system to room temperature, filter and wash the filter cake with deionized water. S3. Dry the washed filter cake to constant weight, crush and grind it to obtain modified biomass fiber, and seal it for later use. S4. Add the inorganic filler to the high-speed mixer, start stirring at the set temperature, and add the titanate coupling agent in the form of spray while stirring. Then continue stirring under the same conditions for a second time. The modified filler component is then discharged and sealed for later use. S5. Add the modified biomass fiber to the slurry mixing tank, then add deionized water to prepare the modified biomass fiber slurry. Start stirring at room temperature, and then add the adhesive component and the modified filler component in sequence while stirring. After each component is added, continue stirring for a third time. S6. Finally, after adding defoamer, preservative and softener in sequence, continue stirring for four hours to obtain the paper forming pulp. S7. The prepared base paper forming pulp is fed into a wire paper machine for papermaking, and after further pressing and dewatering, it is dried and post-processed to obtain the base paper based on biomass conversion materials.
7. The method for preparing base paper based on biomass conversion materials according to claim 6, characterized in that, In S1, the average particle size of the pulverized biomass fiber ranges from 40 to 60 mesh; the beating degree of the biomass fiber mixture is 35-45%.
8. The method for preparing base paper based on biomass conversion materials according to claim 6, characterized in that, In S2, the system pH is 4.0-5.0; the reaction temperature is 60-70℃; the stirring rate is 300-400 rpm; the first duration is 2-4 h; and the filter cake is washed with deionized water until the pH of the washing liquid is 7.0-7.
5.
9. A method for preparing base paper based on biomass conversion materials according to claim 6, characterized in that, In step S4, the inorganic filler includes any one or more of calcium carbonate, kaolin, and talc; the average particle size of the inorganic filler ranges from 2 to 10 μm; the set temperature is 70-80℃; the stirring speed is 900-1200 rpm; the titanate coupling agent includes any one of triisostearyl titanate isopropyl, isopropyltrioleyloxytitanate, and isopropyltris(dioctylpyrophosphateoxy)titanate; the amount of titanate coupling agent added is 1-5% of the mass of the inorganic filler; the second time duration is 10-20 min.
10. A method for preparing base paper based on biomass conversion materials according to claim 6, characterized in that, In S5, the mass of the deionized water is 3-5 times the mass of the modified biomass fiber; the stirring rate is 400-500 rpm; the third duration is 20-30 min; in S6, the fourth duration is 10-15 min.