Golden-silk nanmu ebony processing treatment process

Abstract

The invention discloses a golden-silk nanmu ebony processing technology, and belongs to the technical field of wood processing. A golden-silk nanmu ebony processing technology comprises the steps that after the surface is sanded, vacuum impregnation is conducted through a composite solution containing nano-silicon dioxide and an acrylate copolymer, and drying is conducted in cooperation with a nano-zinc oxide-waterborne polyurethane sealing agent; the temperature, the frequency band and the humidity are controlled by stages through a multi-frequency-band electromagnetic resonance drying kiln, so that the moisture content is stabilized at 12 + / -1%; bamboo fibers and modified starch glue containing nanocellulose are made into a reinforcing sheet, and the tenon-and-mortise structure is reinforced through hot pressing; core-shell particles with cyclodextrin-loaded titanium dioxide as a core and polydimethylsiloxane as a shell are dispersed in UV resin, primer and finish paint are sprayed, and UV curing is carried out. The water content of the wood is stable, the mortise and tenon joint strength is remarkably improved, the surface aging resistance is enhanced, and the method has both environmental protection and economical efficiency and is suitable for the fields of high-end furniture, ancient building repair and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of wood processing, and in particular relates to a processing technology for golden nanmu ebony. Background Art

[0002] As a rare wood, golden nanmu ebony has an irreplaceable position in high-end furniture, handicrafts and other fields due to its unique golden silk texture, corrosion resistance and cultural value. As the scarcity of resources increases, efficient and high-quality processing to maximize its value has become a key demand in the industry. However, the natural structure of golden nanmu ebony is rich in ducts and the moisture content is unevenly distributed, and traditional processing technology faces multiple challenges.

[0003] The current existing technologies have the following shortcomings: drying treatment defects. Traditional drying methods, such as natural drying or single hot air drying, are time-consuming and difficult to accurately control the moisture content, which can easily cause wood to crack and deform, and are especially unable to effectively deal with the free water and bound water in its ducts; the mortise and tenon structure has insufficient strength, and the mortise and tenon joints of natural wood are prone to loosening due to stress concentration during long-term use. Traditional adhesives are not only environmentally friendly, but also have limited bonding with wood fibers; the surface protection performance is weak, and conventional coatings cannot take into account weather resistance, antibacterial properties and texture retention. They are prone to yellowing under ultraviolet radiation, and the adhesion between the coating and the wood substrate is insufficient; processing efficiency and environmental protection issues, some processes rely on organic solvents, such as traditional paints, which not only pollute the environment, but also may destroy the natural texture of the wood, and the processing accuracy of complex structures is difficult to guarantee.

[0004] Therefore, there is an urgent need for a systematic processing technology to solve the problems of poor wood stability, insufficient mechanical properties and environmental defects in the existing technology, so as to achieve efficient utilization and performance improvement of golden nanmu ebony. Summary of the Invention

[0005] In response to the above-mentioned pain points, the present invention provides a processing technology for golden nanmu ebony, which achieves a comprehensive improvement in wood stability, mortise and tenon strength and surface protection performance through composite solution vacuum impregnation and ultrasonic synergistic treatment, multi-band electromagnetic resonance staged drying, bamboo fiber-modified starch glue reinforcement of mortise and tenon structure, and core-shell structure UV curing coating staged spraying.

[0006] The scheme of the present invention is as follows: A processing technology for golden nanmu ebony, characterized by comprising the following steps: S1. Providing a golden nanmu ebony log, pre-sanding its surface, and then vacuum impregnating it in a composite solution containing nano-silica and an acrylate copolymer by weight; spraying a sealant on the wood surface, wherein the sealant contains nano-zinc oxide and a water-based polyurethane resin by weight; after spraying, drying and curing the wood at 25±5°C; S2. Place the wood treated in step S1 in a multi-band electromagnetic resonance drying kiln, and perform drying treatment by controlling the temperature, electromagnetic wave frequency, and ambient humidity in stages, so that the final moisture content of the wood is stabilized at 12±1%; S3, performing mortise and tenon processing on the wood dried in step S2 to form a joint surface between the tenon and the mortise; mixing bamboo fiber with modified starch glue to form a reinforcing sheet, wherein the modified starch glue contains nanocellulose; adhering the reinforcing sheet to the surface of the tenon and the inner wall of the mortise, and performing a hot pressing process; S4. On the surface of the wood product treated in step S3, core-shell structured particles are prepared, each comprising a core layer formed by titanium dioxide particles supported by cyclodextrin and a shell layer formed by polydimethylsiloxane coating; the core-shell structured particles are dispersed in a UV curable resin to form a coating; the coating is first sprayed on the wood surface as a primer layer, and then sprayed as a topcoat layer after curing, and UV curing is performed in stages.

[0007] Preferably, in step S1: The composite solution comprises, based on 100% by total weight, 3.2% of nano-silicon dioxide with an average particle size of 15 to 20 nm, 5% of an acrylic acid ester copolymer, and the balance is deionized water; The sealing agent comprises 8% of nano zinc oxide with an average particle size of 50 nm, 12% of waterborne polyurethane resin, and the balance is deionized water, based on the total weight of 100%; The conditions of the vacuum impregnation treatment are: vacuum degree -0.08 MPa, temperature 25±2° C., time 30 minutes, and simultaneous application of ultrasonic waves with a frequency of 40 kHz and a power of 200 W.

[0008] Preferably, during the vacuum impregnation treatment, the acoustic cavitation effect of 40kHz ultrasound is used to promote the composite solution to penetrate into the golden nanmu ebony conduit and form a directional flow.

[0009] Preferably, the drying process in step S2 includes the following three stages: Stage 1: Temperature 35±2°C, electromagnetic wave frequency 0.5 to 1.0 GHz, and ambient humidity controlled at 75% to 85% RH; Phase II: Temperature 45±2°C, electromagnetic wave frequency 1.0 to 1.8 GHz, and ambient humidity controlled at 65% to 75% RH; Phase 3: Temperature 55±2°C, electromagnetic wave frequency band 1.8 to 2.5 GHz, and ambient humidity controlled at ≤15% RH.

[0010] Preferably, the electromagnetic waves in the first stage with a frequency band of 0.5 to 1.0 GHz act on the free water in the wood cell cavity; the electromagnetic waves in the second stage with a frequency band of 1.0 to 1.8 GHz act on the migration of water adsorbed on the cell wall; and the electromagnetic waves in the third stage with a frequency band of 1.8 to 2.5 GHz act on the directional discharge of water bound by microcapillaries.

[0011] Preferably, in step S3: The bamboo fiber has a length of 0.5 to 1 mm and its volume accounts for 40% of the total volume of the reinforced sheet made by mixing the bamboo fiber and modified starch glue; The amount of nanocellulose added to the modified starch glue is 3% of the weight of the modified starch glue; The thickness of the reinforced sheet is 0.3±0.05 mm, and the hot pressing treatment conditions are: temperature 120±5° C., pressure 8±1 MPa, and time 30 minutes.

[0012] Preferably, nanocellulose is grafted onto the surface of the bamboo fiber, and the nanocellulose forms a hydrogen bond network with the hydroxyl groups on the surface of the bamboo fiber and the aldehyde groups of the modified starch glue through the hydroxyl groups to enhance the binding force.

[0013] Preferably, in step S4, the shell thickness of the core-shell structure particles is 10 to 20 nm, and the dispersion concentration of the particles in the UV curable resin is 15 to 20 wt %; the coating is subjected to ultrasonic dispersion treatment at a power of 300 W, a frequency of 40 kHz, and a time of 20 min. Preferably, in step S4: When spraying the primer layer, a diluent is added to the paint to reduce the viscosity to 30-50 mPa·s (25° C.), and a coating with a thickness of 50 to 80 μm is formed by spraying; When spraying the topcoat, the coating viscosity is maintained at 70-90 mPa·s (25°C), and the coating thickness is 30 to 50 μm. UV curing is then carried out in steps.

[0014] Preferably, the UV curing process includes: The primer layer is irradiated with 365nm wavelength ultraviolet light, and the curing energy is controlled at 300±50mJ / cm 2 ; The topcoat layer is irradiated with 365nm wavelength ultraviolet light, and the curing energy is controlled at 800±50mJ / cm 2 .

[0015] Compared with the prior art, the advantages of the present invention are: (1) In the present invention, a composite solution containing nano-silica and acrylate copolymer is used for vacuum impregnation treatment, and ultrasonic synergistic effect is used to promote the solution to penetrate deeply into the wood ducts, effectively filling the pore structure of the wood. Then, a water-based polyurethane sealant containing nano-zinc oxide is sprayed on the surface to form a protective layer. Under the dual effects, the intrusion of external moisture is isolated, and the deformation resistance of the wood is significantly enhanced. The moisture content after subsequent drying treatment is stably maintained in the ideal range, which fundamentally solves the problem of cracking and deformation of wood caused by uneven moisture content in traditional processes.

[0016] (2) In the present invention, a multi-band electromagnetic resonance drying process is innovatively applied, and electromagnetic waves of different frequency bands are used in stages to treat the free water in the wood cell cavity, the adsorbed water on the cell wall and the bound water in the microcapillary. Compared with the traditional drying method, the processing time is greatly shortened, and the uniformity of the moisture content is improved, and the damage caused by drying stress is avoided. In the strengthening process of the mortise and tenon structure, bamboo fiber and modified starch glue with added nanocellulose are used to make a reinforcing sheet. The bamboo fiber and the colloid are formed into a high-strength interface through hot pressing treatment. The hydrogen bonding between the hydroxyl group of nanocellulose and the bamboo fiber and the adhesive is used to significantly improve the shear strength of the mortise and tenon connection. In addition, the entire strengthening process abandons harmful substances such as formaldehyde, which meets the requirements of environmentally friendly processing.

[0017] (3) In the present invention, core-shell structured protective particles with cyclodextrin-loaded titanium dioxide as the core layer and polydimethylsiloxane as the shell layer are constructed, which are uniformly dispersed in ultraviolet curing resin to form a composite coating. By spraying primer and topcoat in stages and controlling the curing conditions, a protective film with both density and flexibility is formed on the wood surface; the core layer titanium dioxide plays a photocatalytic antibacterial and ultraviolet absorption role, and the shell layer polydimethylsiloxane improves the wear resistance and anti-aging performance of the coating. The staged curing process ensures that the coating is tightly combined with the wood matrix, which not only significantly improves the ultraviolet protection ability, but also effectively retains the natural texture of golden nanmu ebony, achieving dual optimization of protective performance and decorative effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a schematic diagram of the process of processing golden nanmu ebony. DETAILED DESCRIPTION

[0019] The technical solutions of the embodiments of the present invention will be explained and described below, but the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0020] Example 1: 1. Process steps: S1. Raw material pretreatment and vacuum impregnation: select a 20cm diameter golden nanmu ebony log, use 80 mesh sandpaper for surface sanding, and then change to 120 mesh sandpaper for fine grinding until the surface is smooth; prepare a composite solution, weigh 3.2% nano-silica and 5% acrylate copolymer by weight, and the remaining components are composed of deionized water, stir evenly and set aside; put the log into a vacuum tank, inject the composite solution, turn on the vacuum pump to make the vacuum degree reach -0.08MPa, maintain the temperature at 25±2℃, and apply ultrasonic waves with a frequency of 40kHz and a power of 200W. After impregnation for 30 minutes, release the pressure; after the impregnation is completed, prepare a sealant, weigh 8% nano-zinc oxide and 12% water-based polyurethane resin by weight, and the rest is deionized water, mix evenly and spray it on the wood surface with a high-pressure spray gun, and the spraying amount is controlled at 180g / m 2 Then dry and cure at 25±5℃ for 4 hours.

[0021] S2. Multi-band electromagnetic resonance drying: The treated wood is placed in a multi-band electromagnetic resonance drying kiln and dried in three stages: in the first stage, the temperature is controlled at 35±2°C, the electromagnetic wave frequency band is 0.5 to 1.0GHz, and the ambient humidity is maintained at 75% to 85%RH for 12 hours; in the second stage, the temperature is raised to 45±2°C, the electromagnetic wave frequency band is adjusted to 1.0 to 1.8GHz, and the ambient humidity is reduced to 65% to 75%RH for 8 hours; in the third stage, the temperature reaches 55±2°C, the electromagnetic wave frequency band is 1.8 to 2.5GHz, and the ambient humidity is controlled at ≤15%RH, until the final moisture content of the wood stabilizes at 12±1%, and the multi-point detection range does not exceed 0.5%.

[0022] S3. Mortise and tenon reinforcement processing: bamboo fiber is processed to a length of 0.5 to 1 mm and mixed with modified starch glue to prepare a reinforcement sheet; 3% by weight of nanocellulose is added to the modified starch glue, and the volume of bamboo fiber accounts for 40% of the total volume of the reinforcement sheet; the mixture is rolled into a sheet with a thickness of 0.3±0.05 mm, cut and pasted on the surface of the tenon and the inner wall of the mortise, and hot-pressed for 30 minutes using a hot press at a temperature of 120±5°C and a pressure of 8±1 MPa.

[0023] S4. Coating preparation and curing: Prepare core-shell structure particles, use cyclodextrin as a carrier to load titanium dioxide particles to form a core layer, and coat them with polydimethylsiloxane to form a shell layer, with the shell layer thickness controlled at 10 to 20 nm; disperse the core-shell structure particles in a UV curable resin at a concentration of 15 to 20 wt%, and prepare a coating by ultrasonic dispersion treatment at a power of 300 W, a frequency of 40 kHz, and a time of 20 min; when spraying the primer layer, add a diluent to reduce the viscosity of the coating to 30-50 mPa·s (25°C), spray to form a coating with a thickness of 50-80 μm, and use 365 nm wavelength ultraviolet irradiation, and control the curing energy to 300±50 mJ / cm 2 After curing, spray the topcoat layer. The viscosity of the coating is maintained at 70-90mPa·s (25℃). Spray to form a coating with a thickness of 30-50μm. Then irradiate with 365nm wavelength ultraviolet light. The curing energy is controlled at 800±50mJ / cm 2 .

[0024] 2. Performance verification: Moisture content: 12.0%; Shear strength: 13.2MPa; Pencil hardness: 4H; Xenon lamp aging: ΔE =0.9; wood weight gain rate: 12.8%; cracking index: level 0.

[0025] Example 2: 1. Process steps: Compared with Example 1, only the concentration of nano-SiO2 in the composite solution was increased to 4.5%, and the ultrasonic power was increased to 250W. The remaining steps and parameters were the same as those in Example 1.

[0026] 2. Performance verification: Moisture content: 12.1%; Shear strength: 13.0MPa; Pencil hardness: 5H; Xenon lamp aging: ΔE =1.0; Wood weight gain rate: 13.5%; Cracking index: Level 0.

[0027] Example 3: 1. Process steps: The temperature in the third drying stage is raised to 60°C, and the frequency band and humidity parameters in the remaining drying stages are the same as those in Example 1.

[0028] 2. Performance verification: Moisture content: 11.9%; Shear strength: 12.5MPa; Pencil hardness: 4H; Xenon lamp aging: ΔE =1.1; Wood weight gain rate: 12.7%; Cracking index: Level 1.

[0029] Example 4: 1. Process steps: the volume proportion of bamboo fiber is increased to 50%, and the rest is the same as Example 1.

[0030] 2. Performance verification: Moisture content: 12.2%; Shear strength: 12.8MPa; Pencil hardness: 4H; Xenon lamp aging:ΔE =0.9; wood weight gain rate: 12.6%; cracking index: level 0.

[0031] Example 5: 1. Process steps: The concentration of core-shell particles was increased to 25%, and the rest was the same as in Example 1.

[0032] 2. Performance verification: Moisture content: 12.0%; Shear strength: 13.1MPa; Pencil hardness: 4H; Xenon lamp aging: ΔE =1.2; Wood weight gain rate: 12.8%; Cracking index: Level 0.

[0033] Example 6: 1. Process steps: S1 composite solution uses 500nm silicon dioxide, and the rest is the same as Example 1.

[0034] 2. Performance verification: Moisture content: 12.3%; Shear strength: 11.5MPa; Pencil hardness: 3H; Xenon lamp aging: ΔE =1.5; Wood weight gain rate: 7.0%; Cracking index: Level 1.

[0035] Example 7: 1. Process steps: first perform S2 drying, then perform S1 impregnation, and the rest are the same as in Example 1.

[0036] 2. Performance verification: Moisture content: 12.1%; Shear strength: 12.0MPa; Pencil hardness: 4H; Xenon lamp aging: ΔE =1.0; Wood weight gain rate: 12.5%; Cracking index: Level 2.

[0037] Comparative Example 1: 1. Process steps: The composite solution does not contain nano-SiO2, and the rest is the same as in Example 1.

[0038] 2. Performance verification: Moisture content: 12.0%; Shear strength: 12.9MPa; Pencil hardness: 2H; Xenon lamp aging: ΔE =1.8; wood weight gain rate: 12.7%; cracking index: level 0.

[0039] Comparative Example 2: 1. Process steps: vacuum impregnation, except for the elimination of ultrasound, and the rest are the same as in Example 1.

[0040] 2. Performance verification: Moisture content: 12.2%; Shear strength: 12.1MPa; Pencil hardness: 4H; Xenon lamp aging: ΔE =1.0; Wood weight gain rate: 5.7%; Cracking index: Level 2.

[0041] Comparative Example 3: 1. Process steps: 2.5 GHz drying was used throughout the process, and the rest was the same as in Example 1.

[0042] 2. Performance verification: Moisture content: 12.5%; Shear strength: 12.3MPa; Pencil hardness: 4H; Xenon lamp aging: ΔE =1.1; wood weight gain rate: 12.6%; cracking index: level 1.

[0043] Comparative Example 4: 1. Process steps: S2 only performs the first and third drying stages, and the rest are the same as in Example 1.

[0044] 2. Performance verification: Moisture content: 12.8%; Shear strength: 11.8MPa; Pencil hardness: 4H; Xenon lamp aging: ΔE =1.2; wood weight gain rate: 12.7%; cracking index: level 3.

[0045] Comparative Example 5: 1. Process steps: The modified starch glue does not contain nanocellulose, and the rest is the same as in Example 1.

[0046] 2. Performance verification: Moisture content: 12.0%; Shear strength: 8.3MPa; Pencil hardness: 4H; Xenon lamp aging: ΔE =0.9; wood weight gain rate: 12.8%; cracking index: level 0.

[0047] Comparative Example 6: 1. Process steps: The bamboo fiber is not grafted with nanocellulose, and the rest are the same as in Example 1.

[0048] 2. Performance verification: Moisture content: 12.1%; Shear strength: 11.2MPa; Pencil hardness: 4H; Xenon lamp aging: ΔE =1.0; Wood weight gain rate: 12.6%; Cracking index: Level 1.

[0049] Comparative Example 7: 1. Process steps: The coating does not contain core-shell structure particles, and the rest is the same as Example 1.

[0050] 2. Performance verification: Moisture content: 12.0%; Shear strength: 13.0MPa; Pencil hardness: 4H; Xenon lamp aging: ΔE =3.8; wood weight gain rate: 12.8%; cracking index: level 0.

[0051] Comparative Example 8: 1. Process steps: primer and topcoat are cured simultaneously, and the rest are the same as in Example 1.

[0052] 2. Performance verification: Moisture content: 12.0%; Shear strength: 12.9MPa; Pencil hardness: 2H; Xenon lamp aging:ΔE =1.5; wood weight gain rate: 12.7%; cracking index: level 1.

[0053] Performance test comparison 1. Test standards and methods 1-1. Moisture content: According to GB / T 1931-2009, the wood sample is dried at 103±2°C to constant weight using the oven-drying method. The moisture content is calculated and the average and range are obtained from multiple point tests. 1-2. Shear strength: Prepare mortise and tenon specimens according to GB / T 17517-2022. Load the specimens at a speed of 2 mm / min on an electronic universal testing machine. Record the failure load and calculate the shear strength. 1-3. Pencil hardness: According to GB / T 6739-2018, use a 4H to 6H pencil and scratch the coating at a 45° angle with a 1kg load. Observe the scratch depth and damage. 1-4. Xenon lamp aging: According to GB / T 1865-2020, a xenon arc lamp aging test chamber is used with an irradiance of 1.0W / ㎡ (300-800nm), a blackboard temperature of 65°C, and color difference is detected after 600 hours of testing; 1-5. Wood weight gain rate: According to GB / T 1934-2009, the wood sample is weighed before and after immersion, and the weight gain percentage is calculated to reflect the solution penetration effect; 1-6. Cracking index, based on ISO 15998:2014, is determined by observing the length, width, and number of cracks on the wood surface using an optical microscope. It is graded on a scale of 0-5, with grade 0 indicating no cracking.

[0054] 2. Performance test data comparison table

[0055] 3. Summary of performance test results 3-1. Performance consistency verification of examples: Examples 1-5 all meet the qualified values ​​of all performance indicators, among which Example 1 is a full-process standard process, with a moisture content controlled at 12.0%, a shear strength of 13.2 MPa, a coating pencil hardness of 4H, and a xenon lamp aging ΔE =0.9, demonstrating the feasibility and stability of the claimed process. Examples 2-5 show that by adjusting single parameters, such as nano-SiO concentration and bamboo fiber ratio, all indicators remain within the qualified range, verifying the robustness of the process parameters.

[0056] 3-2. Proof of Necessity of Core Technical Features: Effect of nanomaterials: After replacing nano-SiO2 with 500nm micron-sized particles in Example 6, the wood weight gain rate dropped to 7.0%, while that in Example 1 was 12.8%, and the pencil hardness dropped to H, proving the key role of nanoparticle size in penetration and surface properties; after the nano-SiO2 was missing in Comparative Example 1, the pencil hardness was only 2H, and the xenon lamp aging ΔE =1.8, highlighting the necessity of nano-SiO2 for hardness and weather resistance; Ultrasonic waves and drying process: After the ultrasonic wave was removed from Comparative Example 2, the wood weight gain rate was only 5.7%, and the cracking index rose to level 2. Comparative Example 3 used a single frequency band for drying, and the moisture content was as low as 3.2%, which verified the irreplaceable effect of multi-frequency band staged drying for uniform moisture removal. Mortise and tenon reinforcement process: When there is no nanocellulose in comparative example 5, the shear strength drops to 8.3 MPa, which is 37% lower than that in example 1, proving that nanocellulose improves the interface bonding force through the hydrogen bond network; when the bamboo fiber in comparative example 6 is not grafted with nanocellulose, the shear strength drops to 11.2 MPa, which is 15% lower than that in example 1, and the interface debonding rate increases significantly, indicating that the grafting process is indispensable for enhancing the bonding force between the sheet and the mortise and tenon interface; after the core-shell structure is missing in comparative example 7, the xenon lamp aging ΔE =3.8, which is 2.5 times higher than the qualified value, indicating that the core-shell particles have a significant effect on improving weather resistance.

[0057] 3-3. Verification of process integrity: In Example 7, the cracking index increased to Level 2 after adjusting the process sequence, first drying and then impregnation, while the cracking index of the standard example was Level 0, demonstrating the necessity of the "impregnation first, then drying" process sequence for crack prevention; after omitting the second drying stage in Comparative Example 4, the cracking index reached Level 3, further verifying the indispensability of the staged drying step.

[0058] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A processing technology for golden nanmu ebony, characterized in that: The following steps are involved: S1. Providing a golden nanmu ebony log, pre-sanding its surface, and then vacuum impregnating it in a composite solution containing nano-silica and an acrylate copolymer by weight; spraying a sealant on the wood surface, wherein the sealant contains nano-zinc oxide and a water-based polyurethane resin by weight; after spraying, drying and curing the wood at 25±5°C; S2. Place the wood treated in step S1 in a multi-band electromagnetic resonance drying kiln, and perform drying treatment by controlling the temperature, electromagnetic wave frequency, and ambient humidity in stages, so that the final moisture content of the wood is stabilized at 12±1%; S3, performing mortise and tenon processing on the wood dried in step S2 to form a joint surface between the tenon and the mortise; mixing bamboo fiber with modified starch glue to form a reinforcing sheet, wherein the modified starch glue contains nanocellulose; adhering the reinforcing sheet to the surface of the tenon and the inner wall of the mortise, and performing a hot pressing process; S4. For the surface of the wood product treated in step S3, preparing core-shell structure particles with a core layer formed by titanium dioxide particles loaded as a carrier and a shell layer formed by polydimethylsiloxane coating; The core-shell structure particles are dispersed in UV curing resin to form a coating; the coating is first sprayed on the wood surface as a primer layer, and then sprayed as a topcoat layer after curing, and UV curing is performed in stages.

2. The processing technology of golden nanmu ebony according to claim 1, characterized in that: In step S1: The composite solution comprises, based on 100% by total weight, 3.2% of nano-silicon dioxide with an average particle size of 15 to 20 nm, 5% of an acrylic acid ester copolymer, and the balance is deionized water; The sealing agent comprises 8% of nano zinc oxide with an average particle size of 50 nm, 12% of waterborne polyurethane resin, and the balance is deionized water, based on the total weight of 100%; The conditions of the vacuum impregnation treatment are: vacuum degree -0.08 MPa, temperature 25±2° C., time 30 minutes, and simultaneous application of ultrasonic waves with a frequency of 40 kHz and a power of 200 W.

3. A processing technology for golden nanmu ebony according to claim 2, characterized in that: During the vacuum impregnation treatment, the acoustic cavitation effect of 40kHz ultrasonic waves is used to promote the composite solution to penetrate into the golden nanmu ebony conduit and form a directional flow.

4. The processing technology of golden nanmu ebony according to claim 1 is characterized in that: The drying process in step S2 includes the following three stages: Stage 1: Temperature 35±2°C, electromagnetic wave frequency 0.5 to 1.0 GHz, and ambient humidity controlled at 75% to 85% RH; Phase II: Temperature 45±2°C, electromagnetic wave frequency 1.0 to 1.8 GHz, and ambient humidity controlled at 65% to 75% RH; Phase 3: Temperature 55±2°C, electromagnetic wave frequency band 1.8 to 2.5 GHz, and ambient humidity controlled at ≤15% RH.

5. A processing technology for golden nanmu ebony according to claim 4, characterized in that: In the first stage, electromagnetic waves in the frequency band of 0.5 to 1.0 GHz act on the free water in the wood cell cavity; in the second stage, electromagnetic waves in the frequency band of 1.0 to 1.8 GHz act on the migration of water adsorbed on the cell wall; and in the third stage, electromagnetic waves in the frequency band of 1.8 to 2.5 GHz act on the directional discharge of water bound by microcapillaries.

6. The processing technology of golden nanmu ebony according to claim 1 is characterized in that: In step S3: The bamboo fiber has a length of 0.5 to 1 mm and its volume accounts for 40% of the total volume of the reinforced sheet made by mixing the bamboo fiber and modified starch glue; The amount of nanocellulose added to the modified starch glue is 3% of the weight of the modified starch glue; The thickness of the reinforced sheet is 0.3±0.05 mm, and the hot pressing treatment conditions are: temperature 120±5° C., pressure 8±1 MPa, and time 30 minutes.

7. The processing technology of golden nanmu ebony according to claim 6 is characterized in that: Nanocellulose is grafted onto the surface of the bamboo fiber, and the nanocellulose forms a hydrogen bond network with the hydroxyl groups on the surface of the bamboo fiber and the aldehyde groups of the modified starch glue through the hydroxyl groups to enhance the binding force.

8. The process for processing golden nanmu ebony according to claim 1, characterized in that: In step S4, the shell thickness of the core-shell structured particles is 10 to 20 nm, and the dispersion concentration of the particles in the UV curable resin is 15 to 20 wt %; the coating is subjected to ultrasonic dispersion treatment at a power of 300 W, a frequency of 40 kHz, and a time of 20 min.

9. The process for processing golden nanmu ebony according to claim 1, characterized in that: In step S4: When spraying the primer layer, a diluent is added to the paint to reduce the viscosity to 30-50 mPa·s (25° C.), and a coating with a thickness of 50 to 80 μm is formed by spraying; When spraying the topcoat, the coating viscosity is maintained at 70-90 mPa·s (25°C), and the coating thickness is 30 to 50 μm. UV curing is then carried out in steps.

10. The process for processing golden nanmu ebony according to claim 9, characterized in that: The UV curing process includes: The primer layer is irradiated with 365nm wavelength ultraviolet light, and the curing energy is controlled at 300±50mJ / cm 2 ; The topcoat layer is irradiated with 365nm wavelength ultraviolet light, and the curing energy is controlled at 800±50mJ / cm 2 .

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