Preparation method of wear-resistant water-resistant noctilucent recombined bamboo for road guardrail

Abstract

The invention relates to the technical field of recombined bamboos, and discloses a preparation method of wear-resistant and water-resistant noctilucent recombined bamboos for road guardrails, which comprises the following steps: 1) preparing bamboo bundle fibers; 2) bamboo bundle fiber pretreatment; (3) bamboo bundle function strengthening treatment: noctilucent treatment; 4) recombining and forming: 4.1) assembling and designing; (4.2) hot press molding is conducted, specifically, the plate blanks are fed into a hot press, the adhesives between the bamboo bundles and the veneers are promoted to be solidified, and all layers are tightly combined; and (5) post-treatment is conducted, specifically, the wear-resistant and water-resistant noctilucent recombined bamboo for the road guardrail is manufactured and cut and machined according to the guardrail size requirement, and then the bamboo can be used for road guardrail installation. According to the preparation method of the wear-resistant and water-resistant noctilucent recombined bamboo for the road guardrail, resin with a noctilucent function is obtained through compounding of a long afterglow material and novolac epoxy resin; and then bamboo bundle fibers are impregnated with the resin adhesive, and the high-performance recombined bamboo which is resistant to abrasion and water and has the noctilucent function is prepared through a hot-pressing curing composite technology.

Description

Technical Field

[0001] The invention relates to the technical field of recombinant bamboo, in particular to a method for preparing wear-resistant, water-resistant and luminous recombinant bamboo for road guardrails. Background Art

[0002] As a renewable biomass natural material, bamboo has significant advantages in resource advantages, physical and mechanical properties, and aesthetic value. Based on the excellent characteristics of bamboo, reconstructed bamboo processed from bamboo as raw material has been used in the field of road guardrails. However, due to the poor wear resistance and water resistance of reconstructed bamboo, its service life is greatly shortened under relatively harsh outdoor environmental conditions. In addition, the reconstructed bamboo road guardrail itself does not have luminous properties, which also limits its application.

[0003] Phenolic epoxy resin is used in reconstructed bamboo, which can significantly improve the mechanical properties of reconstructed bamboo, making it have high strength, high rigidity and good toughness, and can withstand greater external force and weight and resist impact. It can also greatly enhance the water resistance and wear resistance of reconstructed bamboo. The dense structure formed after curing can effectively prevent water intrusion, reduce hygroscopicity, and reduce deformation, cracking and mildew caused by moisture. At the same time, it gives reconstructed bamboo good wear resistance, making it not easy to wear during long-term use and friction. In addition, the resin has good thermal stability; good chemical stability, resistance to erosion by chemical media such as acid, alkali, and salt, strong anti-aging performance, and can maintain appearance and performance during long-term use; its low volatile organic compound release meets environmental protection requirements and has little impact on the environment and human health.

[0004] Long afterglow luminescent material is abbreviated as long afterglow material, also known as luminous material. It is a material that relies on external field force to stimulate stored energy and has a long-term delayed luminescence phenomenon after stopping the excitation. Among them, silicate-based long afterglow materials have excellent luminescence performance, high initial brightness and long afterglow time, stable physical and chemical properties, good chemical stability, strong thermal stability, good weather resistance; high safety, non-radioactive, non-toxic and harmless. Long afterglow materials are used in reconstructed bamboo, which can make the reconstructed bamboo have the characteristics of self-luminescence at night or in the dark, increase its beauty and uniqueness, and provide more creativity and visual effects for indoor and outdoor decoration, landscape design, etc.

[0005] Therefore, the present invention provides a method for preparing wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrails, which mainly includes the preparation of bamboo bundle fibers, pretreatment of bamboo bundle fibers, bamboo bundle function strengthening treatment, and embryo design and hot pressing molding. It is mainly used to solve the shortcomings of traditional road guardrail materials in terms of wear resistance, water resistance and night visibility, and optimize the structure and performance of reconstituted bamboo to increase the service life of the guardrail. Summary of the invention

[0006] The object of the present invention is to provide a method for preparing wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrails, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a method for preparing wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrails, comprising the following steps:

[0008] 1) Preparation of bamboo bundle fiber: Use a bamboo splitting machine to remove the green and yellow bamboo, and then send the bamboo segments to the bamboo brooming and debonding equipment. After 5-7 times of rolling and debonding, a bamboo bundle structure with continuous longitudinal fibers and moderately loose transverse fibers is formed. The bamboo bundles are woven into bamboo bundle veneers using a weaving machine to facilitate subsequent operations;

[0009] 2) Pretreatment of bamboo fiber: Use strong alkali dilute solution to treat for a period of time to remove some extracts and lignin in the bamboo bundle, reduce the distance between the crystalline regions of cellulose macromolecules; at the same time, the cell wall adsorption force is enhanced, thereby increasing the bamboo bundle's absorption of adhesives and other functionalized inorganic particles; by controlling the softening process parameters such as water temperature, immersion time, alkali concentration, etc., the extracts and lignin are removed to varying degrees; then, according to the use conditions, soak or spray functional substances with different effects;

[0010] 3) Functional enhancement treatment of bamboo bundles: Luminous treatment, first mix phenolic epoxy resin with 10% by weight of the curing agent diethylenetriamine (DETA) of the pure resin, then mix the long afterglow luminous powder (SrAl2O4:Eu2+,Dy3+, 10-40 mesh) with the resin in a ratio of 1:2-1:3, and make the bamboo bundles evenly adhere to the luminous paint by dipping. After dipping for 20 minutes, shield from light and store for later use;

[0011] 4) Recombination molding:

[0012] 4.1) Assembly design: Two layers of treated luminous, wear-resistant and water-resistant bamboo veneers are used as the outer layer, with a layer of bamboo veneer impregnated with phenolic epoxy resin in the middle. The whole board is symmetrically laid to ensure the overall performance and structural stability;

[0013] 4.2) Hot Pressing: The slab is sent into a hot press to solidify the adhesive between the bamboo bundles and the veneer, so that each layer is tightly bonded;

[0014] 5) Post-processing: The wear-resistant, water-resistant and luminous reconstructed bamboo for road guardrail is produced, which can be cut and processed according to the size requirements of the guardrail and can be used for road guardrail installation.

[0015] Furthermore, the immersion time in step 2) is set to 1-3 hours.

[0016] Furthermore, the alkali concentration in step 2) is set to 15%-20%.

[0017] Furthermore, the immersion method in step 2) is specifically to immerse the bamboo bundle in an adhesive with a solid content diluted to 30%-40%.

[0018] Furthermore, in step 4.2), the temperature of the hot press is set to 135-145° C., the hot pressing time is 1 mm / min, and the pressure is 10-15 MPa.

[0019] Furthermore, after the hot press in step 4.2) is completed, cooling water is introduced to cool the press for 30 minutes at a pressure of 10 MPa.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the preparation method of the wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrails obtains a resin with luminous function by compounding a long afterglow material with a phenolic epoxy resin; the bamboo bundle fiber is then impregnated with the resin adhesive, and after a hot pressing and curing composite process, a high-performance reconstituted bamboo that is wear-resistant, water-resistant and has a luminous function is made; this is not only an effective way to efficiently utilize bamboo materials, but also realizes the high performance and multifunctionality of guardrails. At the same time, the use of renewable bamboo resources is also of great significance to environmental protection; the overall structural design of the reconstituted bamboo core bearing layer and the functional strengthening layer, the thickness ratio of each layer, the material distribution method and the interlayer bonding technology ensure that the reconstituted bamboo forms a coherent and efficient protection system from the inside to the outside. The specific effects are as follows:

[0021] In terms of material properties:

[0022] High performance: The reconstructed bamboo prepared by this method exhibits excellent wear resistance and water resistance, and can effectively resist vehicle collision, friction and long-term erosion in outdoor environment (such as wind, rain, sun and rain), thereby significantly extending the service life of road guardrails and reducing the cost and resource waste caused by frequent replacement.

[0023] Multifunctionality: The unique luminous property enables the reconstructed bamboo to clearly show the outline and position of the guardrail at night, providing clear warnings and guidance for pedestrians and vehicles, greatly improving the safety of the road at night. At the same time, this feature also gives the guardrail a beautiful decorative function, enhancing the road landscape effect.

[0024] In terms of resources and environment:

[0025] Efficient use of bamboo: This patent uses abundant bamboo as the main raw material and achieves high added value of bamboo through innovative preparation technology. Bamboo that may have been idle or inefficiently used is transformed into high-performance road guardrail materials, which improves the utilization rate of bamboo, reduces resource waste, and meets the requirements of sustainable development.

[0026] Environmental protection is of great significance: Bamboo, as a renewable resource, has the characteristics of short growth cycle and strong renewable capacity. During its growth, bamboo can also play an ecological role such as purifying the air and conserving water and soil. Compared with traditional road guardrail materials, the preparation method of this patent has less pollution to the environment during the production process, reduces energy consumption and pollutant emissions, and is conducive to the protection of the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0028] Figure 1 This is a schematic diagram of the overall structural design of the reconstructed bamboo core bearing layer and the function strengthening layer of the present invention. DETAILED DESCRIPTION

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1

[0033] A method for preparing wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrails, the specific process is as follows:

[0034] a. Raw materials preparation:

[0035] Select 4-6 year old bamboo with a breast diameter of 6-8cm and strong growth. After felling, transport it to the processing site quickly and cut it into 2m long bamboo segments with electric saws. Prepare specific types of phenolic epoxy resin, diethylenetriamine (DETA), long afterglow luminous powder with excellent luminous performance (SrAl2O4:Eu2+,Dy3+, 10-40 mesh), and various types of processing equipment, and adjust them to the best working state.

[0036] b. Bamboo fiber preparation:

[0037] The bamboo green and yellow are removed by a bamboo splitting machine, and the thickness is controlled at 6-8mm. The bamboo segments are sent to the bamboo brooming and debonding equipment for rolling and debonding to form ideal bamboo bundle fibers. The bamboo bundles are then woven into bamboo bundle veneers using a weaving machine to obtain bamboo bundle veneers of about 1m×2m.

[0038] c. Bamboo fiber pretreatment:

[0039] Prepare 16% sodium hydroxide (NaOH) solution and immerse the bamboo veneers in batches for 2.5 hours. After completion, wash them to neutrality and dry them in a drying oven at 60°C for 4 hours to a moisture content of about 9%.

[0040] d. Bamboo bundle functional enhancement treatment - luminous treatment:

[0041] Mix phenolic epoxy resin and 10% DETA and stir for 30 minutes. Mix long afterglow luminous powder and resin in a ratio of 1:2 and stir for 20 minutes to obtain compound luminous resin. Immerse bamboo veneer in adhesive diluted to 40% solid content for 20 minutes and store in a dark place after drying.

[0042] e. Recombination molding-assembly design:

[0043] Two layers of 8mm thick luminous treated bamboo veneer are used as the outer layer, with a 5mm thick layer of bamboo veneer impregnated with phenolic epoxy resin (impregnated for 30 minutes) in the middle. They are symmetrically laid, and each set is 2.5m long, 0.5m wide, 0.5m wide and 37mm thick.

[0044] f. Recombination molding-hot pressing molding:

[0045] The slab is put into a hot press and hot pressed at 120℃ and 13MPa for 30min, and then put into a cold press and cold pressed at 10MPa for 30min.

[0046] g. Post-processing:

[0047] Grind, saw and cut according to the size of the guardrail. Test the waterproof, wear-resistant and luminous properties of the board.

[0048] Embodiment 2

[0049] A method for preparing wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrails, the specific process is as follows:

[0050] a. Raw materials preparation:

[0051] Select 4-6 year old bamboo with a breast diameter of 6-8cm and strong growth. After felling, transport it to the processing site quickly and cut it into 2m long bamboo segments with electric saws. Prepare specific types of phenolic epoxy resin, diethylenetriamine (DETA), long afterglow luminous powder with excellent luminous performance (SrAl2O4:Eu2+,Dy3+, 10-40 mesh), and various types of processing equipment, and adjust them to the best working state.

[0052] b. Bamboo fiber preparation:

[0053] The bamboo green and yellow are removed by a bamboo splitting machine, and the thickness is controlled at 6-8mm. The bamboo segments are sent to the bamboo brooming and debonding equipment for rolling and debonding to form ideal bamboo bundle fibers. The bamboo bundles are then woven into bamboo bundle veneers using a weaving machine to obtain bamboo bundle veneers of about 1m×2m.

[0054] c. Bamboo fiber pretreatment:

[0055] Prepare 16% sodium hydroxide (NaOH) solution and immerse the bamboo veneers in batches for 2.5 hours. After completion, wash them to neutrality and dry them in a drying oven at 60°C for 4 hours to a moisture content of about 9%.

[0056] d. Bamboo bundle functional enhancement treatment - luminous treatment:

[0057] Mix phenolic epoxy resin and 10% DETA and stir for 30 minutes. Mix long afterglow luminous powder and resin in a ratio of 1:2 and stir for 20 minutes to obtain compound luminous resin. Immerse bamboo veneer in adhesive diluted to 30% solid content for 20 minutes. After impregnation and drying, store in a dark place.

[0058] e. Recombination molding-assembly design:

[0059] Two layers of 5mm thick luminous treated bamboo veneer are used as the outer layer, with an 11mm thick layer of bamboo veneer impregnated with phenolic epoxy resin (impregnated for 30 minutes) in the middle. They are symmetrically laid, and each set is 2.5m long, 0.5m wide, 0.5m wide and 31mm thick.

[0060] f. Recombination molding-hot pressing molding:

[0061] The slab is put into a hot press and hot pressed at 120℃ and 13MPa for 30min, and then put into a cold press and cold pressed at 10MPa for 30min.

[0062] g. Post-processing:

[0063] Grind, saw and cut according to the size of the guardrail. Test the waterproof, wear-resistant and luminous properties of the board.

[0064] Embodiment 3

[0065] A method for preparing wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrails, the specific process is as follows:

[0066] a. Raw materials preparation:

[0067] Select 4-6 year old bamboo with a breast diameter of 6-8cm and strong growth. After felling, transport it to the processing site quickly and cut it into 2m long bamboo segments with electric saws. Prepare specific types of phenolic epoxy resin, diethylenetriamine (DETA), long afterglow luminous powder with excellent luminous performance (SrAl2O4:Eu2+,Dy3+, 10-40 mesh), and various types of processing equipment, and adjust them to the best working state.

[0068] b. Bamboo fiber preparation:

[0069] The bamboo green and yellow are removed by a bamboo splitting machine, and the thickness is controlled at 6-8mm. The bamboo segments are sent to the bamboo brooming and debonding equipment for rolling and debonding to form ideal bamboo bundle fibers. The bamboo bundles are then woven into bamboo bundle veneers using a weaving machine to obtain bamboo bundle veneers of about 1m×2m.

[0070] c. Bamboo fiber pretreatment:

[0071] Prepare 16% sodium hydroxide (NaOH) solution and immerse the bamboo veneers in batches for 2.5 hours. After completion, wash them to neutrality and dry them in a drying oven at 60°C for 4 hours to a moisture content of about 9%.

[0072] d. Bamboo bundle functional enhancement treatment - luminous treatment:

[0073] Mix phenolic epoxy resin and 10% DETA and stir for 30 minutes. Mix long afterglow luminous powder and resin in a ratio of 1:2 and stir for 20 minutes to obtain compound luminous resin. Immerse bamboo veneer in adhesive diluted to 30% solid content for 20 minutes. After impregnation and drying, store in a dark place.

[0074] e. Recombination molding-assembly design:

[0075] Two layers of 5mm thick luminous treated bamboo veneer are used as the outer layer, with an 11mm thick layer of bamboo veneer impregnated with phenolic epoxy resin (impregnated for 30 minutes) in the middle. They are symmetrically laid, and each set is 2.5m long, 0.5m wide, 0.5m wide and 31mm thick.

[0076] f. Recombination molding-hot pressing molding:

[0077] The slab is put into a hot press and hot pressed at 120℃ and 13MPa for 30min, and then put into a cold press and cold pressed at 10MPa for 30min.

[0078] g. Post-processing:

[0079] The pressed composite boards are stacked for two weeks to release stress and prevent cracking and deformation. Then they are sawed, coarse sanded, fine sanded, and dusted for use; polished, sawed, and tenoned according to the size of the road guardrail. The boards are tested for waterproof, wear-resistant, and luminous properties.

[0080] The physical and mechanical properties of the materials of Examples 1, 2 and 3 were tested with reference to GB / T17657-2022 Test Method for Physical and Chemical Properties of Artificial Boards and Facing Artificial Boards, and the structure is as follows:

[0081]

[0082] In summary, compared to traditional road guardrail materials, such as pure metal or concrete, the present invention focuses on the in-depth development and utilization of bamboo. By compounding the long afterglow material with the phenolic epoxy resin, a resin with luminous function is obtained. Subsequently, the bamboo material is compounded with the luminous resin using hot pressing technology. The resulting composite board not only retains the toughness and light weight advantages of the bamboo material itself, but also has excellent wear resistance and water resistance, as well as luminous function to ensure nighttime driving safety. This innovation has greatly broadened the application scope of recombinant bamboo composite materials and brought new possibilities for road guardrail materials.

[0083] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrails, characterized in that: The following steps are involved: 1) Preparation of bamboo bundle fiber: Use a bamboo splitting machine to remove the green and yellow bamboo, and then send the bamboo segments to the bamboo brooming and debonding equipment. After 5-7 times of rolling and debonding, a bamboo bundle structure with continuous longitudinal fibers and moderately loose transverse fibers is formed. The bamboo bundles are woven into bamboo bundle veneers using a weaving machine to facilitate subsequent operations; 2) Pretreatment of bamboo fiber: Use strong alkali dilute solution to treat for a period of time to remove some extracts and lignin in the bamboo bundle, reduce the distance between the crystalline regions of cellulose macromolecules; at the same time, the cell wall adsorption force is enhanced, thereby increasing the bamboo bundle's absorption of adhesives and other functionalized inorganic particles; by controlling the softening process parameters such as water temperature, immersion time, alkali concentration, etc., the extracts and lignin are removed to varying degrees; then, according to the use conditions, soak or spray functional substances with different effects; 3) Functional enhancement treatment of bamboo bundles: Luminous treatment, first mix phenolic epoxy resin with 10% by weight of the curing agent diethylenetriamine (DETA) of the pure resin, then mix the long afterglow luminous powder (SrAl2O4:Eu2+,Dy3+, 10-40 mesh) with the resin in a ratio of 1:2-1:3, and make the bamboo bundles evenly adhere to the luminous paint by dipping. After dipping for 20 minutes, shield from light and store for later use; 4) Recombination molding: 4.1) Assembly design: Two layers of treated luminous, wear-resistant and water-resistant bamboo veneers are used as the outer layer, with a layer of bamboo veneer impregnated with phenolic epoxy resin in the middle. The whole board is symmetrically laid to ensure the overall performance and structural stability; 4.2) Hot Pressing: The slab is sent into a hot press to solidify the adhesive between the bamboo bundles and the veneer, so that each layer is tightly bonded; 5) Post-processing: The wear-resistant, water-resistant and luminous reconstructed bamboo for road guardrail is produced, which can be cut and processed according to the size requirements of the guardrail and can be used for road guardrail installation.

2. The method for preparing the wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrail according to claim 1, characterized in that: The immersion time in step 2) is set to 1-3 hours.

3. The method for preparing the wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrail according to claim 1, characterized in that: In the step 2), the alkali concentration is set to 15%-20%.

4. The method for preparing the wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrail according to claim 1, characterized in that: The dipping method in step 2) is specifically to immerse the bamboo bundle in an adhesive with a solid content diluted to 30%-40%.

5. The method for preparing the wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrail according to claim 1, characterized in that: In step 4.2), the temperature of the hot press is set to 135-145° C., the hot pressing time is 1 mm / min, and the pressure is 10-15 MPa.

6. The method for preparing the wear-resistant, water-resistant and luminous reconstituted bamboo for road guardrail according to claim 1, characterized in that: After the hot press in step 4.2) is completed, cooling water is introduced into the hot press for 30 minutes at a pressure of 10 MPa.

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