Natural composite adhesive based on raw lacquer and hardwood carving layered inlaying process thereof

Abstract

The invention relates to the technical field of artwork processing, and discloses a natural composite adhesive based on raw lacquer and a hardwood carving layered inlaying process thereof, the natural composite adhesive comprises a modified raw lacquer adhesive, a pigment, a precious metal dispersion, a diluent and a protective agent, the pigment is a natural plant pigment, and the pigment is a natural plant pigment. The modified raw lacquer adhesive comprises the following raw materials in parts by weight: 60-85 parts of dehydrated raw lacquer; 5-8 parts of rosin; 1-5 parts of beewax; the raw urushiol polymer has super-long durability, the raw urushiol polymer is resistant to hydrolysis and oxidation, and the accelerated aging equivalent life is longer than or equal to 200 years; the produced product has extremely strong artistic expressive force, so that the environmental protection property of the product is greatly improved, and molecular-level combination of color and metal is realized; the layering controllable curing process solves the problems of cracking and falling of a traditional paint layer.

Description

Technical Field

[0001] The present invention relates to the technical field of artwork processing, in particular to a natural composite adhesive based on raw lacquer and a hardwood carving layered inlaying process thereof. Background Art

[0002] Layered inlay, a complex technique that combines materials science, aesthetics, and precision machining, is widely used in jewelry, high-end furniture, artwork, and decorative materials. Its core principle is to combine different materials (such as metal, wood, gemstones, and ceramics) in precise geometric or artistic structures through layered stacking and inlaying techniques, creating works with a strong sense of three-dimensionality and rich visual depth.

[0003] With the passage of time, modern art has gradually discovered flaws in its craftsmanship. During the process of carving, gluing, and polishing, artists discovered numerous problems with adhesives. Chemical synthetic adhesives used in the layered inlay of hardwood carvings have been found to be incompatible with natural wood. After completion, they release organic volatiles, which pose health risks to the artist and can easily fail environmental standards. The prolonged evaporation process can lead to aging and failure, especially in ultraviolet light and humid heat. They can easily yellow and become brittle, leading to cracking between layers. Furthermore, due to the significant shrinkage differences between chemical synthetic adhesives and materials like metal, temperature fluctuations generate internal stress, leading to debonding. Traditional lacquer, used in the process, requires multiple applications, resulting in long drying times and low production efficiency. Inadequate control during the multi-layer inlay process can also affect the craftsmanship. Furthermore, lacquer's poor adhesion to precious metals can easily lead to problems such as peeling from the metal surface, cracking, and edge lift.

[0004] In order to further improve the layered inlay process, a natural composite adhesive based on raw lacquer and a hardwood carved layered inlay process are disclosed to solve the above problems. Summary of the Invention

[0005] The invention aims to provide a natural composite adhesive based on raw lacquer and a hardwood carving layered inlaying process thereof.

[0006] The scheme of the present invention is: A natural composite adhesive based on raw lacquer, comprising a modified raw lacquer adhesive, a pigment, a precious metal dispersion, a diluent and a protective agent, wherein the pigment is a natural plant pigment, and the modified raw lacquer adhesive comprises the following raw materials in parts by weight: 60-85 parts of dehydrated lacquer; 5-8 parts of rosin; 1 to 5 parts of beeswax.

[0007] As a preferred technical solution, the modified raw lacquer adhesive also includes additives, which include modified nano-scale titanium dioxide and modified carbon nanotubes. The usage of the modified carbon nanotubes accounts for 0.05-0.1% of the raw lacquer usage; the usage of the modified titanium dioxide accounts for 0.1-0.5% of the raw lacquer usage.

[0008] As a preferred technical solution, the viscosity of the modified raw lacquer adhesive is controlled at 1500-2000 cP at 25°C.

[0009] As a preferred technical solution, the diluent is turpentine and the protective agent is tung oil.

[0010] The present invention also discloses a natural composite adhesive based on raw lacquer applied to a hardwood carving layered inlay process, comprising the following steps: 1) Material preparation: dehydrate raw lacquer at a low temperature of 40-50°C to obtain dehydrated raw lacquer, add 5-8 parts of rosin and 1-5 parts of beeswax to 60-85 parts by weight of the dehydrated raw lacquer, and filter to a particle size of ≤50 μm to obtain a modified raw lacquer adhesive; extract the desired natural plant pigment using an ethanol-water gradient extraction system and concentrate to a color value of ≥100 to obtain a natural plant pigment; premix the desired precious metal powder with the modified raw lacquer adhesive in proportion, and ultrasonically disperse to form a stable suspension at 20 kHz for 30 minutes to obtain a precious metal dispersion; 2) Pre-treatment of hardwood carving: The base material is selected to be hardwood with a density of ≥0.75g / cm³ and a moisture content of 8% to 10%. The carving process is manual carving with computer numerical control (CNC)-assisted positioning and a gradient depth design. After the pre-treatment is completed, the carving is obtained. 3) Layered inlaying: The sculpture from step 2) is subjected to bottom layer penetration, wherein the bottom layer penetration is performed by diluting the modified lacquer adhesive from step 1) with a diluent, applying the diluted material, and curing the material for 24 hours in an environment with a relative humidity of 60% to form a porous adsorption layer; the sculpture is then subjected to middle layer color inlay, wherein the middle layer color inlay is performed by mixing the natural plant pigment from step 1) with the modified lacquer adhesive in a certain proportion, applying the material layer by layer, and accelerating the curing with ultraviolet light; the sculpture is then subjected to surface metal reinforcement, wherein the surface metal reinforcement is performed by applying a precious metal dispersion to the metal layer of the sculpture through three steps of inlaying and grinding; the three steps of inlaying and grinding are performed in sequence, followed by inlaying, air drying, and polishing with 800-grit wet sandpaper, and the cycle is repeated until the metal layer thickness is ≥30 μm; 4) Finishing and durability treatment: The sculpture coated with the metal layer is subjected to surface sealing. The surface sealing is performed by mixing the modified raw lacquer adhesive and the protective agent in proportion to obtain a mixed liquid, coating with the mixed liquid, and thermally polymerizing at 50° C. for 72 hours to obtain the finished sculpture.

[0011] As a preferred technical solution, in step 1), the particle size of the precious metal powder is ≤1 μm, the mass ratio of the precious metal powder to the modified raw lacquer adhesive is 1:3; and the particle size of the precious metal powder agglomerates in the precious metal dispersion formed after ultrasound is ≤5 μm.

[0012] As a preferred technical solution, in step 2), the hardwood is red sandalwood or huanghuali wood, and the depth of the pattern is designed to be 0.2-1 mm for the shallow layer and 2-3 mm for the deep layer.

[0013] As a preferred technical solution, in step 3), the modified raw lacquer adhesive is diluted with a diluent, the diluent is turpentine, and the mass ratio of the modified raw lacquer adhesive to the turpentine is 7:3; the natural plant pigment and the modified raw lacquer adhesive are mixed in a mass ratio of 1:5; each layer in the middle layer filling is ≤0.1mm, and the ultraviolet light accelerated curing is 365nm, 10W / m², 5min / layer.

[0014] As a preferred technical solution, the protective agent in step 4) is tung oil, and the modified raw lacquer adhesive and tung oil are mixed in a mass ratio of 9:1; step 4) also includes anti-aging verification, and the sculpture is subjected to an accelerated aging test in a UV aging test chamber (QUV). After 3000 hours, ΔE≤1.5 (color difference) and the adhesion remains at level 0.

[0015] QUV accelerated aging test is carried out according to ISO 4892-3 standard, and adhesion test is carried out according to ASTM D3359 standard.

[0016] As a preferred technical solution, in step 1), the dispersion of modified carbon nanotubes and modified nano-scale titanium dioxide is slowly added to the raw lacquer, mechanically stirred at 500 rpm for 1 hour, and circulated for 3-5 times using a three-roll mill, and then dehydrated.

[0017] The modified carbon nanotube preparation method comprises placing single-walled carbon nanotubes in 95% sulfuric acid at a volume ratio of 3:1, ultrasonically treating at 60°C for 2 hours to introduce -COOH groups to enhance compatibility, washing to neutrality, vacuum drying at 60°C, reacting aminosilane with carboxylated carbon nanotubes in ethanol at a ratio of 1:0.5-1, reacting in ethanol at 60°C for 4 hours to obtain modified carbon nanotubes, adding the modified carbon nanotubes to anhydrous ethanol, and ultrasonically treating at 300W for 30 minutes to obtain a modified carbon nanotube dispersion.

[0018] The preparation method of the modified nano-scale titanium dioxide comprises the following steps: coating a 5-10 nm thick silicon dioxide layer on the surface of the titanium dioxide by a sol-gel method to reduce degradation of photocatalytic activity; dissolving methacryloxysilane in ethanol, dissolving 1 g of methacryloxysilane in 30 ml of ethanol, adding 1 drop of acetic acid, and stirring at room temperature for 30 minutes to generate a silanol solution; dispersing the coated titanium dioxide in ethanol, dissolving 10 g of the coated titanium dioxide in 200 ml of ethanol, ultrasonically treating the solution for 30 minutes at a power of 300 W, then slowly adding the silanol solution, and stirring at 70° C. for 4 hours; centrifuging at 8000 rpm for 10 minutes, collecting the modified titanium dioxide, washing it with ethanol for 2-3 times to remove unreacted silane, and vacuum drying it at 80° C. for 12 hours to obtain the modified nano-scale titanium dioxide; adding the modified nano-scale titanium dioxide into ethanol, ball milling it for 4 hours with ZrO2 balls at 200 rpm to obtain a modified nano-scale titanium dioxide dispersion.

[0019] The application of modified raw lacquer adhesive in hardwood carving, its layered curing process makes the paint film stress ≤0.5MPa.

[0020] Due to the adoption of the above-mentioned technical scheme, the natural composite adhesive based on raw lacquer and the hardwood carving layered inlay process thereof include modified raw lacquer adhesive, pigment, precious metal dispersion, diluent and protective agent. The pigment is a natural plant pigment. The modified raw lacquer adhesive includes the following raw materials in parts by weight: 60 to 85 parts of dehydrated raw lacquer; 5 to 8 parts of rosin; and 1 to 5 parts of beeswax.

[0021] Advantages of the present invention: The modified lacquer adhesive of the present invention makes the product have ultra-long durability after use. The lacquer phenol polymer is resistant to hydrolysis and oxidation. The accelerated aging equivalent life of the polymer is calculated to be ≥200 years according to the Arrhenius model. The products produced have strong artistic expression, good refractive index gradient design, enhanced visual mechanism, multi-layer refractive effect (refractive index of each layer is 1.55~1.62), which produces three-dimensional visual level, presents color gradient, avoids opalescence turbidity, and maintains high light transmittance.

[0022] The graded use of natural composite adhesives has greatly improved the environmental friendliness of the product. There are no synthetic chemicals in the whole process and it complies with the EN71-3 toy safety standard.

[0023] The present invention improves permeability by modifying raw lacquer and combines nano-level precious metal dispersion technology to achieve molecular-level combination of color and metal.

[0024] The process of the invention of the controlled layered curing solves the problems of cracking and falling off of the traditional paint layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a photo of the completed product in Example 7 of the present invention; Figure 2 This is a partially enlarged photo of the product in Example 7 of the present invention Figure 3 This is a photo of the product after completion in Example 8 of the present invention; Figure 4 This is a partially enlarged photograph of the product in Example 8 of the present invention. DETAILED DESCRIPTION

[0027] In order to make up for the above deficiencies, the present invention provides a natural composite adhesive based on raw lacquer and a hardwood carving layered inlaying process thereof to solve the problems in the above background technology.

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0029] Example 1 The raw lacquer is dehydrated at low temperature to obtain dehydrated raw lacquer, wherein the low temperature is 40° C. 5 parts of rosin and 1 part of beeswax are added to 60 parts by weight of the dehydrated raw lacquer, and the mixture is filtered to a particle size of ≤50 μm to obtain a modified raw lacquer adhesive, i.e., a natural grade modified raw lacquer adhesive.

[0030] Example 2 The raw lacquer is dehydrated at low temperature to obtain dehydrated raw lacquer, wherein the low temperature is 50° C. 8 parts of rosin and 5 parts of beeswax are added to 85 parts by weight of the dehydrated raw lacquer, and the mixture is filtered to a particle size of ≤50 μm to obtain a modified raw lacquer adhesive, i.e., a natural grade modified raw lacquer adhesive.

[0031] Example 3 The raw lacquer is dehydrated at low temperature to obtain dehydrated raw lacquer, wherein the low temperature is 40° C. 6 parts of rosin and 2 parts of beeswax are added to 70 parts by weight of the dehydrated raw lacquer, and the mixture is filtered to a particle size of ≤50 μm to obtain a modified raw lacquer adhesive, i.e., a natural grade modified raw lacquer adhesive.

[0032] Example 4 Slowly add the dispersion of modified carbon nanotubes and modified nano-scale titanium dioxide into the raw lacquer, mechanically stir at 500 rpm for 1 hour, and circulate the mixture for 3 to 5 times using a three-roll grinder. Then dehydrate the mixture to obtain dehydrated raw lacquer. The low temperature is 40°C. 5 parts of rosin and 1 part of beeswax are added to 60 parts by weight of the dehydrated raw lacquer. The mixture is filtered to a particle size of ≤50 μm to obtain a modified raw lacquer adhesive.

[0033] The usage of the modified carbon nanotubes accounts for 0.05% of the usage of the raw lacquer; the usage of the modified titanium dioxide accounts for 0.1% of the usage of the raw lacquer.

[0034] Example 5 Slowly add the dispersion of modified carbon nanotubes and modified nano-scale titanium dioxide to the raw lacquer, mechanically stir at 500 rpm for 1 hour, and circulate the mixture for 3-5 times using a three-roll mill, and then dehydrate to obtain a dehydrated raw lacquer. The low temperature is 50° C., and 8 parts of rosin and 5 parts of beeswax are added to 85 parts by weight of the dehydrated raw lacquer, and filtered to a particle size of ≤50 μm to obtain a modified raw lacquer adhesive. The usage of the modified carbon nanotubes accounts for 0.1% of the usage of the raw lacquer; the usage of the modified titanium dioxide accounts for 0.5% of the usage of the raw lacquer.

[0035] Example 6 Slowly add the dispersion of modified carbon nanotubes and modified nano-scale titanium dioxide into the raw lacquer, mechanically stir at 500 rpm for 1 hour, and circulate the treatment for 3-5 times using a three-roll grinder, and then dehydrate to obtain dehydrated raw lacquer. The low temperature is 45°C. 7 parts of rosin and 2 parts of beeswax are added to 70 parts by weight of the dehydrated raw lacquer, and filtered to a particle size of ≤50 μm to obtain a modified raw lacquer adhesive.

[0036] The usage of the modified carbon nanotubes accounts for 0.08% of the usage of the raw lacquer; the usage of the modified titanium dioxide accounts for 0.2% of the usage of the raw lacquer.

[0037] Example 7 1) Material preparation: Dehydrated lacquer is obtained by low-temperature dehydration at 40°C. 6 parts of rosin and 2 parts of beeswax are added to 70 parts by weight of the dehydrated lacquer, and the mixture is filtered to a particle size of ≤50 μm to obtain a modified lacquer adhesive. The desired natural plant pigment is extracted with an ethanol-water gradient system and concentrated to a color value of ≥100 to obtain a natural plant pigment. The desired precious metal powder is premixed with the modified lacquer adhesive in a certain proportion and ultrasonically dispersed to form a stable suspension at 20 kHz for 30 minutes to obtain a precious metal dispersion. The metal powder is 999 pure gold powder. 2) Pre-treatment of hardwood carving: Rosewood is the base material. The carving process is hand-carved with computer numerical control (CNC)-assisted positioning. The inlaid gold-inlaid pen holder pattern is designed with a depth gradient, with a shallow depth of 0.5mm and a deep depth of 2-3mm. After the pre-treatment, the carving is completed. 3) Layered inlaying: The sculpture from step 2) is subjected to bottom layer penetration, wherein the bottom layer penetration is performed by diluting the modified lacquer adhesive from step 1) with a diluent, applying the diluted material, and curing the material for 24 hours in an environment with a relative humidity of 60% to form a porous adsorption layer; the sculpture is then subjected to middle layer color inlay, wherein the middle layer color inlay is performed by mixing the natural plant pigment from step 1) with the modified lacquer adhesive in a certain proportion, applying the material layer by layer, and accelerating the curing with ultraviolet light; the sculpture is then subjected to surface metal reinforcement, wherein the surface metal reinforcement is performed by applying a precious metal dispersion to the metal layer of the sculpture through three steps of inlaying and grinding; the three steps of inlaying and grinding are performed in sequence, followed by inlaying, air drying, and polishing with 800-grit wet sandpaper, and the cycle is repeated until the metal layer thickness is ≥30 μm; 4) Finishing and durability treatment: The sculpture coated with the metal layer is subjected to surface sealing. The surface sealing is performed by mixing the modified raw lacquer adhesive and the protective agent in proportion to obtain a mixed liquid, coating with the mixed liquid, and thermally polymerizing at 50° C. for 72 hours to obtain the finished sculpture.

[0038] In the step 1), the particle size of the precious metal powder is ≤1 μm, and the mass ratio of the precious metal powder to the modified raw lacquer adhesive is 1:3; and the particle size of the precious metal powder agglomerates in the precious metal dispersion formed after ultrasonic treatment is ≤5 μm.

[0039] In step 3), the modified raw lacquer adhesive is diluted with a diluent, the diluent is turpentine, and the mass ratio of the modified raw lacquer adhesive to the turpentine is 7:3; the natural plant pigment and the modified raw lacquer adhesive are mixed in a mass ratio of 1:5; each layer of the middle layer filling is ≤0.1mm, and the ultraviolet light accelerated curing is 365nm, 10W / m², 5min / layer.

[0040] The protective agent in step 4) is tung oil, and the modified raw lacquer adhesive and tung oil are mixed in a mass ratio of 9:1. Step 4) also includes anti-aging verification, and the sculpture is subjected to an accelerated aging test in a UV aging test chamber (QUV). After 3000 hours, ΔE≤1.5 (color difference) and the adhesion remains at level 0.

[0041] QUV accelerated aging test is carried out according to ISO 4892-3 standard, and adhesion test is carried out according to ASTM D3359 standard.

[0042] The obtained product has the following inlay layers: 3 layers of base color (cinnabar + the modified raw lacquer adhesive) and 2 layers of stamens (gold powder complex).

[0043] The finished product has no cracking after 100 times of heat cycle at -30 ~ 80℃.

[0044] Raw lacquer is a natural lacquer secreted by carefully selected lacquer trees, with a solid content ≥65% and a moisture content ≤30%.

[0045] Example 8 1) Material preparation: Dehydrated lacquer is obtained by low-temperature dehydration at 40°C. 6 parts of rosin and 2 parts of beeswax are added to 70 parts by weight of the dehydrated lacquer, and the mixture is filtered to a particle size of ≤50 μm to obtain a modified lacquer adhesive. The desired natural plant pigment is extracted with an ethanol-water gradient system and concentrated to a color value of ≥100 to obtain a natural plant pigment. The desired precious metal powder is premixed with the modified lacquer adhesive in a certain proportion and ultrasonically dispersed to form a stable suspension at 20 kHz for 30 minutes to obtain a precious metal dispersion. The metal powder is 999 pure gold powder. 2) Hardwood carving pretreatment: Rosewood is the base material. The carving process is hand-carved with computer numerical control (CNC)-assisted positioning. The persimmon tree and bird patterns are designed with a gradient depth. The carving is completed after pretreatment. The carving depth is 0.5mm for the shallow layer and 2-3mm for the deep layer. 3) Layered inlaying: The sculpture from step 2) is subjected to bottom layer penetration, wherein the bottom layer penetration is performed by diluting the modified lacquer adhesive from step 1) with a diluent, applying the diluted material, and curing the material for 24 hours in an environment with a relative humidity of 60% to form a porous adsorption layer; the sculpture is then subjected to middle layer color inlay, wherein the middle layer color inlay is performed by mixing the natural plant pigment from step 1) with the modified lacquer adhesive in a certain proportion, applying the material layer by layer, and accelerating the curing with ultraviolet light; the sculpture is then subjected to surface metal reinforcement, wherein the surface metal reinforcement is performed by applying a precious metal dispersion to the metal layer of the sculpture through three steps of inlaying and grinding; the three steps of inlaying and grinding are performed in sequence, followed by inlaying, air drying, and polishing with 800-grit wet sandpaper, and the cycle is repeated until the metal layer thickness is ≥30 μm; 4) Finishing and durability treatment: The sculpture coated with the metal layer is subjected to surface sealing. The surface sealing is performed by mixing the modified raw lacquer adhesive and the protective agent in proportion to obtain a mixed liquid, coating with the mixed liquid, and thermally polymerizing at 50° C. for 72 hours to obtain the finished sculpture.

[0046] In the step 1), the particle size of the precious metal powder is ≤1 μm, and the mass ratio of the precious metal powder to the modified raw lacquer adhesive is 1:3; and the particle size of the precious metal powder agglomerates in the precious metal dispersion formed after ultrasonic treatment is ≤5 μm.

[0047] In step 3), the modified raw lacquer adhesive is diluted with a diluent, the diluent is turpentine, and the mass ratio of the modified raw lacquer adhesive to the turpentine is 7:3; the natural plant pigment and the modified raw lacquer adhesive are mixed in a mass ratio of 1:5; each layer of the middle layer filling is ≤0.1mm, and the ultraviolet light accelerated curing is 365nm, 10W / m², 5min / layer.

[0048] The protective agent in step 4) is tung oil, and the modified raw lacquer adhesive and tung oil are mixed in a mass ratio of 9:1. Step 4) also includes anti-aging verification, and the sculpture is subjected to an accelerated aging test in a UV aging test chamber (QUV). After 3000 hours, ΔE≤1.5 (color difference) and the adhesion remains at level 0.

[0049] QUV accelerated aging test is carried out according to ISO 4892-3 standard, and adhesion test is carried out according to ASTM D3359 standard.

[0050] The basic principles, main features, and advantages of the present invention are shown and described above. 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 illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to 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 natural composite adhesive based on raw lacquer, characterized in that: The modified lacquer adhesive comprises a modified raw lacquer adhesive, a pigment, a precious metal dispersion, a diluent and a protective agent. The pigment is a natural plant pigment. The modified raw lacquer adhesive comprises the following raw materials in parts by weight: 60-85 parts of dehydrated lacquer; 5-8 parts of rosin; 1 to 5 parts of beeswax.

2. The natural composite adhesive based on raw lacquer according to claim 1, characterized in that : The modified raw lacquer adhesive also includes additives, which include modified nano-scale titanium dioxide and modified carbon nanotubes. The usage of the modified carbon nanotubes accounts for 0.05 to 0.1% of the raw lacquer usage; the usage of the modified titanium dioxide accounts for 0.1 to 0.5% of the raw lacquer usage.

3. The natural composite adhesive based on raw lacquer according to claim 1, characterized in that: The viscosity of the modified raw lacquer adhesive is controlled at 1500-2000 cP at 25°C.

4. The natural composite adhesive based on raw lacquer according to claim 1, characterized in that: The diluent is turpentine oil, and the protective agent is tung oil.

5. A natural composite adhesive based on raw lacquer as claimed in any one of claims 1 to 4, applied to the process of hardwood carving and layered inlaying, characterized in that: The following steps are involved: 1) Material preparation: dehydrate raw lacquer at a low temperature of 40-50°C to obtain dehydrated raw lacquer, add 5-8 parts of rosin and 1-5 parts of beeswax to 60-85 parts by weight of the dehydrated raw lacquer, and filter to a particle size of ≤50 μm to obtain a modified raw lacquer adhesive; extract the desired natural plant pigment using an ethanol-water gradient system and concentrate to a color value of ≥100 to obtain a natural plant pigment; premix the desired precious metal powder with the modified raw lacquer adhesive in proportion, and ultrasonically disperse to form a stable suspension at 20 kHz for 30 minutes to obtain a precious metal dispersion; 2) Pre-treatment of hardwood carving: The base material is selected to be hardwood with a density of ≥0.75g / cm³ and a moisture content controlled at 8% to 10%. The carving process is CNC-assisted positioning followed by manual fine carving, with a depth gradient design for the pattern. After the pre-treatment is completed, the carving is obtained. 3) Layered inlaying: The sculpture from step 2) is subjected to bottom layer penetration, wherein the bottom layer penetration is performed by diluting the modified lacquer adhesive from step 1) with a diluent, applying the diluted material, and curing the material for 24 hours in an environment with a relative humidity of 60% to form a porous adsorption layer; the sculpture is then subjected to middle layer color inlay, wherein the middle layer color inlay is performed by mixing the natural plant pigment from step 1) with the modified lacquer adhesive in a certain proportion, applying the material layer by layer, and accelerating the curing with ultraviolet light; the sculpture is then subjected to surface metal reinforcement, wherein the surface metal reinforcement is performed by applying a precious metal dispersion to the metal layer of the sculpture through three steps of inlaying and grinding; the three steps of inlaying and grinding are performed in sequence, followed by inlaying, air drying, and polishing with 800-grit wet sandpaper, and the cycle is repeated until the metal layer thickness is ≥30 μm; 4) Finishing and durability treatment: The sculpture coated with the metal layer is subjected to surface sealing. The surface sealing is performed by mixing the modified raw lacquer adhesive and the protective agent in proportion to obtain a mixed liquid, coating with the mixed liquid, and thermally polymerizing at 50° C. for 72 hours to obtain the finished sculpture.

6. The lacquer-based natural composite adhesive according to claim 5 is applied to the hardwood carving layered inlay process, characterized in that: In the step 1), the particle size of the precious metal powder is ≤1 μm, and the mass ratio of the precious metal powder to the modified raw lacquer adhesive is 1:3; and the particle size of the precious metal powder agglomerates in the precious metal dispersion formed after ultrasonic treatment is ≤5 μm.

7. The lacquer-based natural composite adhesive according to claim 5 is applied to the hardwood carving layered inlay process, characterized in that: In the step 2), the hardwood is red sandalwood or huanghuali wood, and the depth of the pattern is designed to be 0.2-1 mm for the shallow layer and 2-3 mm for the deep layer.

8. The lacquer-based natural composite adhesive according to claim 5 is applied to the hardwood carving layered inlay process, characterized in that: In step 3), the modified raw lacquer adhesive is diluted with a diluent, wherein the diluent is turpentine, and the mass ratio of the modified raw lacquer adhesive to the turpentine is 7:3; the natural plant pigment and the modified raw lacquer adhesive are mixed in a mass ratio of 1:5; each layer of the middle layer filling is ≤0.1mm, and the ultraviolet light accelerated curing is 365nm, 10W / m², and 5min / layer.

9. The lacquer-based natural composite adhesive according to claim 5 is applied to the hardwood carving layered inlay process, characterized in that: The protective agent in step 4) is tung oil, and the modified raw lacquer adhesive and tung oil are mixed in a mass ratio of 9:1; step 4) also includes anti-aging verification, the sculpture is subjected to QUV accelerated aging test, after 3000 hours, ΔE≤1.5, and the adhesion remains at level 0.

10. The lacquer-based natural composite adhesive according to claim 5 is applied to the hardwood carving layered inlay process, characterized in that: In the step 1), the dispersion of modified carbon nanotubes and modified nano-scale titanium dioxide is slowly added to the raw lacquer, mechanically stirred at 500 rpm for 1 hour, and circulated for 3-5 times using a three-roll mill, and then dehydrated.

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