Method for preparing scrimber by compounding basalt fiber with fast-growing poplar defibered fiber

Abstract

The invention relates to the field of material science, and discloses a method for preparing scrimber by compounding basalt fiber with fast-growing poplar defibered fiber, which comprises the following steps: carrying out gum dipping treatment twice on a wood fiber bundle, carrying out normal-pressure dipping on the wood fiber bundle with the gum solution concentration of the first gum dipping being 13-15% and the gum solution concentration of the second gum dipping being 30-35%; carrying out surface modification treatment on the basalt fiber, wherein the surface modification treatment comprises alkali treatment and silane coupling agent treatment; the modified basalt fibers are made into a net shape and combined with the defibered fibers, and the basalt fibers are controlled to account for 10%-12% of the total mass; and the light scrimber with the density of 0.65-0.75 g / cm < 3 > is prepared through a compression molding process of cold pressing and thermocuring. According to the method, small-diameter logs are rotationally cut into veneers with the thickness of 5-7 mm, the veneers are treated through the wet defibering process to obtain the net-shaped wood fiber bundles, and the fast-growing poplar which is a renewable resource is effectively utilized. And meanwhile, by introducing the basalt fibers subjected to alkali treatment and silane coupling agent treatment, not only is the performance of the material improved, but also the utilization of the natural basalt is increased.

Description

Technical Field

[0001] The invention relates to the technical field of material science, and in particular to a method for preparing reconstituted wood by combining basalt fiber with fast-growing poplar wood decomposed fiber. Background Art

[0002] With the increasing awareness of environmental protection and the need for resource conservation, the development and utilization of renewable resources and environmentally friendly materials have become a research hotspot. Fast-growing poplar wood is widely used in wood processing industries such as plywood, furniture, and wood flooring due to its short growth cycle, abundant resources, and easy processing. However, when traditional reconstituted wood materials pursue higher mechanical properties, they are often accompanied by a larger compression ratio and a higher consumption of raw wood per unit volume, resulting in high density of the finished product, high cost, and limited scope of application.

[0003] Basalt fiber, as a high-performance inorganic non-metallic material, is regarded as an effective substitute for carbon fiber and glass fiber due to its excellent mechanical properties, high temperature resistance, corrosion resistance, electrical insulation, environmental protection and sustainability. Although the application of basalt fiber is gradually expanding, there are relatively few studies on its application in wood composites, especially in combination with fast-growing poplar.

[0004] At present, wood decomposition technology mainly includes two forms: one is to obtain uneven wood fiber bundles through cooking and mechanical treatment; the other is to obtain uniform fiber bundles through a fine decomposition process after the small-diameter logs are peeled into thin boards. Although the latter provides more uniform fiber bundles, how to effectively improve the mechanical properties and durability of these fiber-based reconstructed woods is still a technical challenge.

[0005] In addition, although some research teams have tried to use basalt fiber to reinforce wood or wood composites to improve their mechanical properties, how to achieve effective composite of basalt fiber and fast-growing poplar fiber to create a reconstituted wood material that is both lightweight and high-performance, as well as how to simplify the production process and reduce costs, still requires further research.

[0006] Therefore, the present invention proposes a method for preparing reconstituted wood by combining basalt fiber with fast-growing poplar wood decomposed fiber to solve the shortcomings of the prior art. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a method for preparing reconstituted wood by combining basalt fiber with fast-growing poplar wood decomposed fiber, aiming to solve the problems of high density, increased cost and limited application scope of reconstituted wood materials in the prior art, while making full use of the high performance and environmental protection characteristics of basalt fiber. By studying the effective composite technology of basalt fiber and fast-growing poplar wood decomposed fiber, a new medium-density, lightweight, high-performance and environmentally friendly reconstituted wood material is developed, providing a new solution for the wood processing industry and environmental protection.

[0008] To achieve the above object, the present invention is realized through the following technical solutions: A method for preparing recombinant wood from basalt fiber composite fast-growing poplar wood defibrated fibers, comprising the following steps: Rotary cut small-diameter logs into veneers with a thickness of 5 mm - 7 mm, and process them through a wet defibration process, controlling the moisture content of the raw materials between 20% - 30% to obtain a reticular wood fiber bundle arranged longitudinally and connected transversely; Perform two impregnation treatments on the wood fiber bundle. The concentration of the first impregnation glue solution is 13% - 15%, and the concentration of the second impregnation glue solution is 30% - 35%, and perform atmospheric pressure impregnation; Perform surface modification treatment on the basalt fiber, including alkali treatment and silane coupling agent treatment; Make the modified basalt fiber into a net shape, combine it with the defibrated fibers, and control the basalt fiber to account for 10% - 12% of the total mass; Through a cold pressing and hot curing molding process, produce lightweight recombinant wood with a density of 0.65 g / cm³ - 0.75 g / cm³.

[0009] Preferably, the wood fiber bundle is dried to a moisture content of 6% - 8% before impregnation treatment.

[0010] Preferably, the surface modification treatment of the basalt fiber includes treating it in a 1% - 2% NaOH solution at 70°C - 80°C for 1 - 1.5 hours to increase the surface friction and ionophilic properties of the basalt fiber.

[0011] Preferably, the surface modification treatment of the basalt fiber further includes soaking it in a 1% concentration of KH550 silane coupling agent for 1.3 - 1.5 hours, and then drying it at 40°C to 50°C.

[0012] Preferably, for the directional molding process, the normal temperature molding pressure is 3 - 3.5 mpa, the curing temperature is 120°C - 140°C, and the curing time per millimeter of material thickness is 2 - 4 minutes.

[0013] Preferably, the impregnation treatment of the wood fiber bundle includes first negative pressure impregnation and second impregnation under atmospheric pressure to improve the adhesion between the wood fiber and the basalt fiber.

[0014] Preferably, the molding step includes adding a release agent in the mold to prevent the molding material from adhering to the mold, so as to improve the molding efficiency and the quality of the finished product. The release agent includes but is not limited to silicone oil, polytetrafluoroethylene coating, and paraffin.

[0015] Preferably, the application method of the produced recombinant wood includes using the recombinant wood for the manufacture of interior and exterior building walls, floors, or furniture.

[0016] The present invention provides a method for preparing recombinant wood from basalt fiber composite fast-growing poplar delignified fibers, with the following beneficial effects: 1. In the present invention, small-diameter logs are rotary cut into veneers with a thickness of 5 mm - 7 mm, and reticulated wood fiber bundles are obtained through wet delignification process. The present invention effectively utilizes the renewable resource of fast-growing poplar. Meanwhile, the introduction of basalt fibers treated with alkali treatment and silane coupling agent not only improves the performance of the material, but also increases the utilization of natural basalt. This inorganic non-metallic material has remarkable environmental friendliness.

[0017] 2. Through precisely controlled impregnation treatment (adjusting the moisture content to 6% - 8%, and the glue solution concentrations are 13% - 15% and 30% - 35% respectively) and the composite of basalt fibers and fast-growing poplar delignified fibers (controlling the basalt fibers to account for 10% - 12% of the total mass) in the present invention, the successfully prepared recombinant wood not only has a moderate density (0.65 g / cm³ - 0.75 g / cm³), but also has excellent bending resistance and weather resistance. This enables the recombinant wood material to have broad application potential in the fields of furniture, decorative and finishing materials, and outdoor structural and non-structural materials, etc.

[0018] 3. The one-step forming process adopted in the present invention (normal temperature molding pressure 3 - 3.5 mpa, curing temperature 120℃ - 140℃, and the curing time per millimeter is 2 - 4 minutes), as well as the use of release agent in the molding step, effectively improves the production efficiency and reduces the adhesion problem with the mold. This is of great significance for reducing production costs and enhancing industrial competitiveness.

[0019] 4. The technical solution of the present invention emphasizes the environmental protection characteristics of the production process. For example, by using environmentally friendly basalt fibers and optimizing the utilization efficiency of wood, it helps to reduce the environmental burden and support the sustainable development strategy. In addition, this method also promotes the cultivation of fast-growing wood, further strengthening its contribution to carbon sequestration and environmental protection goals.

[0020] 5. The present invention not only provides a new method for preparing recombinant wood, but also promotes the technological innovation and industrial upgrading of the wood processing and composite material industries by achieving the efficient composite of wood and basalt fibers. This technical solution can form new industrial chains and industrial alliances, with a complete set of technical systems with independent intellectual property rights, providing strong support for the adjustment of the forestry industrial structure and the cultivation of strategic emerging industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of the method for preparing recombinant wood from basalt fiber composite fast-growing poplar delignified fibers of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] Next, in combination with the accompanying drawings of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment: Please refer to the attached Figure 1 : Embodiment 1: Manufacturing of Outdoor Garden Furniture Steps: Select fast-growing poplar wood with a smaller diameter and veneer it into a 6-mm-thick single board.

[0024] The single board is processed by the wet pulping process, and the moisture content is adjusted to 25% to obtain a network of wood fiber bundles.

[0025] The wood fiber bundles are impregnated with glue. The concentration of the glue solution for the first impregnation is 13%, and the concentration of the glue solution for the second impregnation is 35%.

[0026] The basalt fibers are treated with a 1% NaOH solution for 1 hour, then soaked in a 1% concentration of KH550 silane coupling agent for 1.3 hours and dried at 45°C.

[0027] The basalt fibers and the wood fiber bundles are compounded in a ratio of 12%, and through the cold pressing and hot curing molding process, a recombinant wood with a density of 0.7 g / cm³ is prepared.

[0028] The prepared recombinant wood material is used for the manufacture of outdoor garden furniture.

[0029] Summary: The recombinant wood material prepared in this embodiment is suitable for outdoor use, has good weather resistance and a moderate density, and is an ideal choice for making garden furniture.

[0030] Embodiment 2: Manufacturing of Interior Decoration Boards Steps: Use 5-mm-thick fast-growing poplar wood veneer for wet pulping, and control the moisture content to 20%.

[0031] The concentration of the glue solution for the first impregnation of the wood fiber bundles is 15%, and the concentration of the glue solution for the second impregnation is 30%.

[0032] The basalt fibers are treated with a 2% NaOH solution for 1.5 hours, soaked in a 1% concentration of KH550 silane coupling agent for 1.5 hours, and dried at 50°C.

[0033] The basalt fibers and the wood fiber bundles are compounded in a ratio of 10%, and the molding process is adopted, and the density is set to 0.65 g / cm³.

[0034] The prepared recombinant wood material is used for interior decoration boards.

[0035] Summary: The recombinant wood of this example has a low density and good decorative properties, and is suitable as an interior decoration board, such as a wall covering material.

[0036] Example 3: Fabrication of high-strength structural boards Steps: Use fast-growing poplar veneers with a thickness of 7 mm, adjust the moisture content to 30%, and obtain wood fiber bundles through wet disintegration.

[0037] The wood fiber bundles are impregnated twice, and the impregnation concentrations are 15% and 35% respectively.

[0038] The basalt fibers are first treated in a 1% NaOH solution for 1 hour, then soaked in a 1% KH550 silane coupling agent for 1.5 hours, and dried at 40 °C.

[0039] The proportion of basalt fibers in the composite material is 12%, and it is formed by compression molding, and the density is adjusted to 0.75 g / cm³.

[0040] It is used to fabricate high-strength structural boards.

[0041] Summary: The recombinant wood provided in this example has a higher density and strength, and is particularly suitable for structural boards requiring load-bearing.

[0042] Example 4: Fabrication of interior floor materials Steps: The fast-growing poplar veneers are wet-disintegrated, with a moisture content of 20% and a thickness of 5 mm.

[0043] Double impregnation treatment, with concentrations of 13% and 30% respectively.

[0044] The basalt fibers are treated in a 1%-2% NaOH solution at 70 °C for 1 hour, then soaked in a 1% KH550 silane coupling agent for 1.3 hours, and dried at 45 °C.

[0045] The basalt fibers and wood fiber bundles are compounded at a ratio of 10%, and formed by compression molding process, and the density is set to 0.7 g / cm³.

[0046] The material is used for the fabrication of interior floors.

[0047] Summary: The recombinant wood floor material prepared in this example combines the high strength of basalt fibers and the natural beauty of wood fibers, and is suitable for indoor floor use.

[0048] Example 5: Fabrication of exterior wall covering materials Steps: The fast-growing poplar veneer with a thickness of 6.5 mm is obtained by rotary cutting, and the moisture content is adjusted to 30% through wet pulping.

[0049] The wood fiber bundles are impregnated with glue twice, and the concentrations are 15% and 35% respectively.

[0050] The basalt fibers are treated with alkali and silane coupling agent to increase the surface adhesion.

[0051] The basalt fibers and wood fiber bundles are compounded at a ratio of 12%, and the molding process is used to obtain the reconstituted wood with a density of 0.75 g / cm³.

[0052] This material is used for the exterior wall covering of buildings.

[0053] Summary: The reconstituted wood material in this embodiment has strong weather resistance, is suitable for use as an exterior wall covering material for buildings, and can withstand adverse external environmental conditions.

[0054] Summary These five embodiments demonstrate the diversity of the technical solutions of the present invention and the wide range of applications. By adjusting the ratio of basalt fibers and wood fiber bundles, the concentration of impregnation treatment, and the parameters of the molding process, reconstituted wood materials with different properties can be prepared according to different application requirements. Whether it is outdoor furniture, interior decoration, structural plates, floors or exterior wall covering materials, the present invention can provide excellent material solutions, reflecting the organic combination of environmental protection, high performance and economic benefits.

[0055] Comparative experiment: Comparative experiment 1: Comprehensive performance test Title of comparative experiment: Comprehensive performance test: The reconstituted wood material of the present invention and traditional reconstituted wood materials Composition of the existing technical solution: Traditional reconstituted wood: 100% fast-growing poplar fibers are used, and through conventional impregnation treatment (using a single 20% concentration glue solution), without basalt fiber composite or special surface treatment, and conventional compression molding.

[0056] Composition of the technical solution of the present invention: The present invention includes using fast-growing poplar veneers with a thickness of 5 mm - 7 mm, composite of basalt fibers treated with alkali and silane coupling agent, specific impregnation treatment and optimized molding process.

[0057] Experimental steps: Sample preparation: Traditional reconstituted wood: Select standard fast-growing poplar fibers, conduct conventional impregnation treatment (using 20% concentration glue solution), and compress and mold according to the traditional process.

[0058] Recombinant wood of the present invention: Prepare samples according to the steps described in the present invention, including the compounding of basalt fibers and fast-growing poplar wood fibers treated with alkali treatment and silane coupling agent treatment.

[0059] Density test: Measure the density of each sample using the volume displacement method.

[0060] Flexural strength test: Conduct a flexural strength test using a universal material testing machine according to ISO 178 standard.

[0061] Water absorption rate test: After soaking the sample in water for 24 hours, measure the mass difference before and after water absorption and calculate the water absorption rate.

[0062] Weather resistance test: Expose the sample to ultraviolet light for a certain period of time and measure the ΔE value using a color difference meter.

[0063] Cost calculation: Calculate the production cost per cubic meter of material based on the cost data of materials, processing, and production processes.

[0064] Experimental data table: Comparison itemsTraditional recombinant woodRecombinant wood of the present inventionDensity (g / cm³)0.80.7Flexural strength (MPa)3555Water absorption rate (%)128Weather resistance (ΔE value)106Production cost ($)250280 Comparison summary: The recombinant wood of the present invention maintains a lower density while significantly improving the flexural strength, reducing the water absorption rate, and showing better weather resistance. Although the production cost increases slightly (about 12%), due to the overall improvement in performance, the recombinant wood of the present invention has an obvious advantage in terms of cost performance.

[0065] Comparison experiment 2: Environmental protection and sustainability performance test Comparison experiment title: Environmental protection and sustainability test: Recombinant wood material of the present invention and traditional recombinant wood material Composition of the prior art solution: Traditional recombinant wood: Adopt 100% fast-growing poplar wood fibers, through conventional impregnation treatment (using a single 20% concentration glue solution), without basalt fiber compounding or special surface treatment, and conventional compression molding.

[0066] Composition of the technical solution of the present invention: The present invention includes the use of fast-growing poplar wood veneers with a thickness of 5 mm - 7 mm, the compounding of basalt fibers treated with alkali treatment and silane coupling agent treatment, specific impregnation treatment, and an optimized molding process.

[0067] CO2 emission calculation: Calculate the CO2 emissions according to the energy consumption in the production and processing of raw materials, referring to relevant standards (such as ISO14067).

[0068] Waste recovery rate assessment: Statistically analyze the amount of waste generated during the production process and the proportion of its recycling and treatment, and calculate the waste recoverable rate.

[0069] Experimental data table: Comparison items: Traditional reconstituted wood, Invention reconstituted wood. CO2 emissions (kg / cubic meter): 100, 70. Waste recoverable rate (%): 30, 60. Comparison summary: By optimizing the material composition and production process, the present invention significantly reduces CO2 emissions and also significantly improves the waste recoverable rate, demonstrating the significant advantages of the present invention in terms of environmental protection and sustainability.

[0070] Comparison experiment 3: Application field expandability test Comparison experiment title: Application field expandability test: The reconstituted wood material of the present invention and the traditional reconstituted wood material Composition of the prior art solution: Traditional reconstituted wood: Made of 100% fast-growing poplar wood fibers, through conventional impregnation treatment (using a single 20% concentration glue solution), without basalt fiber composite or special surface treatment, and formed by conventional compression.

[0071] Composition of the technical solution of the present invention: The present invention includes using fast-growing poplar veneers with a thickness of 5 mm - 7 mm, basalt fiber composite treated with alkali treatment and silane coupling agent, specific impregnation treatment, and optimized molding process.

[0072] Indoor decoration application test: Evaluate the aesthetics, processability, and decoration effect of the material, and score through the feedback of designers and users.

[0073] Outdoor furniture application test: Make outdoor furniture samples and conduct on-site tests, including weather resistance and durability tests, and score through user feedback.

[0074] Structural board application test: Make structural board samples and conduct load-bearing and stability tests, and score through engineer evaluation.

[0075] Experimental data table: Application field: Applicability of traditional reconstituted wood, Applicability of the reconstituted wood of the present invention. Indoor decoration: General, Excellent. Outdoor furniture: Poor, Excellent. Structural board: General, Excellent. Comparison summary: Due to its better physical and chemical properties, such as higher flexural strength and lower water absorption rate, the reconstituted wood material of the present invention performs excellently in multiple application fields such as indoor decoration, outdoor furniture, and structural boards, significantly superior to the traditional reconstituted wood material, demonstrating its wide application potential.

[0076] Summary summary Through the above comparative experiments, the recombinant wood material of the present invention exhibits significant advantages over traditional recombinant wood in terms of comprehensive performance, environmental protection and sustainability, and expandability of application fields. Although the production cost has increased, considering its comprehensive advantages in performance improvement, environmental protection contribution, and application potential, the present invention provides a new recombinant wood material solution with high cost performance, which meets the demand direction of the current and future markets and has broad application prospects and social value.

[0077] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing recombinant wood from basalt fiber composite fast-growing poplar wood defibrated fibers, characterized in that, It includes the following steps: Rotary cut small-diameter logs into veneers with a thickness of 5 mm - 7 mm, and process them through a wet disintegration process. Control the moisture content of the raw materials between 20% - 30% to obtain a network of wood fiber bundles arranged longitudinally and connected transversely; Conduct two impregnation treatments on the wood fiber bundles. The concentration of the first impregnation glue solution is 13% - 15%, and the concentration of the second impregnation glue solution is 30% - 35%. Conduct atmospheric pressure impregnation; Conduct surface modification treatment on basalt fibers, including alkali treatment and silane coupling agent treatment; Make the modified basalt fibers into a network and combine them with the disintegrated fibers, controlling the basalt fibers to account for 10% - 12% of the total mass; Through a cold pressing and hot curing molding process, produce lightweight recombined wood with a density of 0.65 g / cm³ - 0.75 g / cm³.

2. The method for preparing recombinant wood from basalt fiber composite fast-growing poplar delignified fibers according to claim 1, characterized in that, The wood fiber bundles are dried to a moisture content of 6% - 8% before the impregnation treatment.

3. The method for preparing recombinant wood from basalt fiber composite fast-growing poplar delignified fibers according to claim 1, characterized in that, The surface modification treatment of the basalt fibers includes treating them in a 1% - 2% NaOH solution at 70°C - 80°C for 1 - 1.5 hours to increase the surface friction and ionic affinity of the basalt fibers.

4. The method for preparing recombinant wood from basalt fiber composite fast-growing poplar delignified fibers according to claim 1, wherein The surface modification treatment of the basalt fibers further includes soaking them in a 1% concentration of KH550 silane coupling agent for 1.3 - 1.5 hours, and then drying them at 40°C to 50°C.

5. The method for preparing recombinant wood from basalt fiber composite fast-growing poplar wood defibrated fibers according to claim 1, characterized in that, For the directional molding process, use a normal temperature molding pressure of 3 - 3.5 mpa, a curing temperature of 120°C - 140°C, and a curing time of 2 - 4 minutes per millimeter of material thickness.

6. The method for preparing recombinant wood from basalt fiber composite fast-growing poplar delignified fibers according to claim 1, characterized in that, The impregnation treatment of the wood fiber bundles includes the first negative pressure impregnation and the second impregnation under atmospheric pressure to improve the adhesion between the wood fibers and the basalt fibers.

7. The method for preparing recombinant wood from basalt fiber composite fast-growing poplar defibrated fibers according to claim 1, characterized in that, The molding step includes adding a release agent in the mold to prevent the molding material from sticking to the mold, so as to improve the molding efficiency and the quality of the finished product. The release agent includes but is not limited to silicone oil, polytetrafluoroethylene coating, paraffin.

8. An application method of recombined wood produced by using the method according to claims 1 - 7, which includes using the recombined wood for the manufacture of interior and exterior building walls, floors or furniture.

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