Natural mineral bone ash composite memorial and method for manufacturing the same

Abstract

The application provides a natural mineral bone ash composite memorial product and a preparation method thereof, and belongs to the technical field of life memorial products. The memorial product is prepared by mixing natural mineral powder and purified bone ash in a specific ratio as a base, using a mussel biomimetic composite adhesive containing an ortho-diphenol group as a binding phase, and adding a natural mineral toner. The preparation method comprises the following steps: base material pretreatment, vacuum stirring and slurry preparation, mold cavity pouring and shaping, constant temperature and humidity curing and activation, preliminary drying, ultraviolet light induced crosslinking, and segmented heat curing. The application effectively solves the problem of layering of traditional bone ash memorial product base materials, and the product has good mechanical strength, toughness and outstanding weather resistance, and is rich in cultural texture of natural minerals, and is suitable for various long-term memorial scenes indoors and outdoors. The application solves the technical problems of existing bone ash memorial products, such as easy layering of base materials, poor mechanical properties, weak weather resistance, insufficient cultural connotation, and poor product quality and consistency caused by extensive forming process.

Description

Technical Field

[0001] This invention belongs to the field of memorial products for the deceased, and more specifically, relates to a natural mineral cremated remains composite memorial and its preparation method. Background Technology

[0002] Currently, cremation keepsakes on the market (such as cremation crystals, cremation sculptures, etc.) generally suffer from the following technical defects: Poor substrate adhesion: Most of them use general-purpose resins such as unsaturated polyester resin and epoxy resin as binders. These resins have poor chemical compatibility with the surface of hydroxyapatite, the main component of bone ash, and various natural mineral powders. The interfacial bonding force is weak, which makes the finished product prone to delamination and cracking. The overall mechanical properties are low, the compressive strength is usually less than 20MPa, and it is brittle and difficult to preserve stably for a long time.

[0003] Insufficient durability: The general-purpose resins used generally have poor weather resistance. Under the long-term effects of outdoor ultraviolet radiation, alternating temperature and humidity changes, they are prone to yellowing, surface powdering, cracking, and even structural degradation, failing to meet the requirements for long-term outdoor placement or heirloom collection.

[0004] Limited cultural value: The base materials of existing products are mostly made of cheap quartz sand, ordinary stone powder or single mineral raw materials, lacking natural precious mineral components with traditional cultural connotations and aesthetic value. This limits the commemorative attributes and artistic collection value of the products, making it difficult to meet consumers' dual needs for emotional expression and cultural connotation.

[0005] The molding process is crude: the molding process mostly adopts atmospheric pressure stirring, which makes it difficult to completely remove air bubbles in the slurry, resulting in low density of the finished product and easy presence of internal defects; the curing process is simple and crude, making it difficult to accurately control the reaction process, resulting in poor product dimensional accuracy and surface smoothness (usually surface roughness Ra>1.0μm), and making it impossible to guarantee the consistency of product performance in mass production.

[0006] Although mussel-inspired adhesives have attracted attention in fields such as biomaterials due to their excellent wet adhesion, they have not yet been systematically applied to solve the problems of interfacial bonding and durability in composite keepsakes made from cremated remains and natural minerals. Furthermore, there is a lack of a systematic preparation process that can achieve high density and high precision molding, which limits the improvement of the quality and value of cremated remains keepsakes. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a natural mineral cremated remains composite keepsake and its preparation method, which solves the technical problems of existing cremated remains keepsakes, such as easy delamination of the substrate, poor mechanical properties, weak weather resistance, insufficient cultural connotation, and poor product quality and consistency due to rough molding processes.

[0008] A natural mineral cremated remains composite keepsake, comprising the following components by weight: 50-65 parts natural mineral powder, 30-40 parts purified cremated remains, 12-18 parts mussel biomimetic composite adhesive, and 0.3-1.5 parts natural mineral colorant. The natural mineral powder is composed of organic gemstone powder and inorganic gemstone powder mixed in a mass ratio of 1:1.2-1.8; The organic gemstone powder is selected from at least one of crystal, coral, giant clam shell, amber, and pearl, with a particle size of 120-180 mesh; The inorganic gemstone powder is selected from at least one of the following: Hetian jade, jadeite, turquoise, agate, ruby, sapphire, emerald, tourmaline, lapis lazuli, malachite, Dushan jade, Xiuyan jade, quartzite jade, Huanglong jade, Shoushan stone, and chicken blood stone, with a particle size of 150-200 mesh. The mussel-inspired composite adhesive is composed of the following components in parts by weight: 88 parts of premixed mother liquor, 6 parts of silane coupling agent KH-5603-, and 4-8 parts of nano-hydroxyapatite; The premixed mother liquor is composed of the following components in parts by weight: 40 parts of 3,4-dihydroxyphenylmethacrylamide, 25 parts of isooctyl acrylate, 30 parts of isobornyl methacrylate, 1-2 parts of composite photoinitiator, 0.5-1 part of antioxidant, and 0.5-1 part of ultraviolet absorber; The nano-hydroxyapatite has a particle size of 50-80 nm.

[0009] Preferably, the composite photoinitiator is a mixture of 2-hydroxy-2-methyl-1-phenyl-1-propanone and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide in a mass ratio of 1:1.

[0010] Preferably, the antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; and the ultraviolet absorber is 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole.

[0011] Preferably, the natural mineral colorant is selected from one or more of ochre, azurite, and malachite, with a particle size of 200-250 mesh.

[0012] Preferably, the method for preparing the purified cremated remains includes the following steps: drying the original cremated remains at 105-120℃ for 2-3 hours, pulverizing them to 180-220 mesh, soaking them in 0.5mol / L hydrochloric acid solution for 30-40 minutes, repeatedly washing them with deionized water until neutral, and then drying them at 110℃ for 1-2 hours.

[0013] Another technical problem to be solved by the present invention is to provide a method for preparing natural mineral cremated remains composite keepsakes, comprising the following steps: (1) Substrate pretreatment: After the natural mineral powder is mixed evenly, it is dried in a vacuum drying oven at 60-70℃ for 2-3 hours; the purified bone ash and natural mineral colorant are mixed in a high-speed mixer at 3000r / min for 5 minutes to obtain composite substrate powder; (2) Vacuum mixing and slurry preparation: The composite substrate powder is put into a double planetary vacuum mixer, the vacuum is drawn to -0.08MPa, and the mixture is pre-mixed at 350-450r / min for 5-8 minutes. After injecting the mussel biomimetic composite adhesive, the speed is adjusted to 200-250r / min and the mixture is continuously stirred for 18-22 minutes. During this period, 2-4% of the total mass of the raw materials is added in 2-3 batches of anhydrous ethanol. The viscosity of the slurry is adjusted to 6000-9000mPa・s. After maintaining the vacuum and standing for 3 minutes, the material is discharged. (3) Molding and molding: Inject the slurry into the composite mold, smooth the surface, and let it stand at 20-25℃ for 10-15 minutes; (4) Biomimetic cross-linking curing: The process involves constant temperature and humidity curing activation, preliminary drying, ultraviolet light-induced cross-linking, and segmented thermal curing. (5) Post-processing and finishing: After demolding and drying, wet grinding and polishing are performed. Laser engraving or pattern engraving can be performed to obtain the finished product.

[0014] Preferably, in step (4): the conditions for constant temperature and humidity curing and activation are a temperature of 55-65℃, a relative humidity of 85-95%, and a time of 24-30 hours; The preliminary drying conditions are a temperature of 40-50℃, a well-ventilated environment, and a time of 1-2 hours; The ultraviolet light-induced crosslinking is performed using an ultraviolet lamp with a dominant wavelength of 365 nm and an irradiation intensity of 800-1000 mW / cm². 2 Irradiation distance: 5-8cm; duration: 10-15 minutes; The segmented thermosetting process involves first pre-curing at 28-32℃ for 5-6 hours, and then raising the temperature to 55-65℃ for a second curing of 18-24 hours.

[0015] Compared with the prior art, the present invention has the following beneficial effects: Using a specially formulated mussel-inspired composite adhesive, the catechol groups in its core component, 3,4-dihydroxyphenylmethylacrylamide (DMA), can form strong intermolecular forces with acid-washed and purified bone ash (hydroxyapatite) and the surfaces of various minerals. Combined with the bridging effect of silane coupling agents, this effectively improves the problem of easy delamination and cracking of bone ash and minerals in traditional products, significantly enhancing the integrity of the product's internal structure.

[0016] The compressive strength of the product of this invention can reach over 22 MPa, while the elongation at break remains within a reasonable range of 8%-20%, exhibiting good balance between rigidity and toughness and overcoming the brittleness of traditional products. The antioxidants and UV absorbers compounded in the adhesive, together with their stable chemical structure, endow the product with excellent weather resistance. After undergoing thermal cycling at -40℃ to 60℃ and long-term UV aging tests, the product's appearance and key mechanical properties remain stable, meeting the stringent requirements for long-term outdoor storage.

[0017] The raw material system innovatively integrates dozens of natural and precious minerals from two major categories: organic gemstones (crystal, coral, giant clam, etc.) and inorganic gemstones and jade (Hetian jade, jadeite, tourmaline, etc.). The materials themselves have rich traditional cultural connotations and collection value, and the composite will produce unique textures and color changes, making each product have a unique artistic beauty, greatly enhancing the cultural added value and emotional carrying function of souvenirs.

[0018] The developed systematic molding process of "vacuum stirring and defoaming—constant humidity activation of the interface—preliminary drying—photo-initiated crosslinking—segmented thermosetting" achieves precise control over the density of the slurry, the degree of interfacial reaction, and the curing process. This process effectively reduces defects such as internal bubbles in the product, ensuring high consistency and reliability of product performance. The finished product has a high surface smoothness and clear details, solving the problem of unstable product quality caused by the roughness of traditional processes.

[0019] The product combines excellent durability with elegant artistry, and can be flexibly made into various forms such as commemorative plaques, commemorative ornaments, and reliefs according to needs. It can be used in outdoor memorial venues or as indoor family heirlooms, significantly expanding the application scenarios of cremated remains keepsakes and meeting the needs of different consumers. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the embodiments of this invention are described in further detail below with reference to specific examples and relevant testing standards. These embodiments are only for explaining this invention and are not intended to limit the scope of protection of this invention.

[0022] The natural mineral-cremation urn of this invention uses natural mineral powder and purified cremation urn as the matrix, mussel biomimetic composite adhesive as the binding phase, and natural mineral colorant as the coloring component. It is prepared through a systematic process of "substrate pretreatment—vacuum stirring and pulping—mold filling and molding—biomimetic cross-linking curing—post-treatment finishing." The following two specific embodiments illustrate this in detail. All raw materials used meet the quality standards specified in the technical solution, and all equipment is conventional industrial-grade equipment, ensuring process repeatability.

[0023] General requirements for raw material pretreatment: Preparation of natural mineral powders: Organic gemstone powders (crystal, coral, etc.) are coarsely crushed by a jaw crusher and finely crushed by a ball mill. They are then screened through a standard inspection sieve to obtain 120-180 mesh powders and dried until the moisture content is ≤0.5%. Inorganic gemstone powders (Hetian jade, jadeite, etc.) undergo the same crushing and grinding process, and are screened to obtain 150-200 mesh powders. They are then dried until the moisture content is ≤0.5% and mixed evenly at a mass ratio of 1:1.2-1.8 for later use.

[0024] Preparation of purified cremated remains: Take the original cremated remains and place them in an electric thermostatic drying oven. Dry them at 105-120℃ for 2-3 hours to remove moisture and volatile organic compounds. After pulverizing them with a high-speed pulverizer, sieve them through a 180-220 mesh standard sieve and collect the powder that passes through the sieve. Place the powder in an acid-resistant container and add 0.5mol / L hydrochloric acid solution, ensuring the liquid level is 5-10cm above the powder. Soak for 30-40 minutes, stirring every 10 minutes to remove organic impurities and soluble salts. Wash the powder repeatedly with deionized water until the pH of the washing solution is 6.8-7.2 (neutral). Finally, place it in an electric thermostatic drying oven at 110℃ and dry for 1-2 hours. After cooling, seal and store for later use.

[0025] Preparation of Mussel Bionic Composite Adhesive: According to the technical scheme, a premixed mother liquor was first prepared: 40 parts of 3,4-dihydroxyphenylmethacrylamide, 25 parts of isooctyl acrylate, and 30 parts of isoborneol methacrylate were added to a reaction vessel and stirred for 30 minutes at 50°C under nitrogen protection until completely mixed; then 1-2 parts of a composite photoinitiator (a 1:1 mixture of 2-hydroxy-2-methyl-1-phenyl-1-propanone and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide) and an antioxidant tetrakis[β- 0.5-1 part of pentaerythritol ester (3,5-di-tert-butyl-4-hydroxyphenyl)propionate and 0.5-1 part of benzotriazole, an ultraviolet absorber, were stirred for 20 minutes to obtain a premixed mother liquor. 3-6 parts of silane coupling agent KH-560 and 4-8 parts of nano-hydroxyapatite (particle size 50-80 nm) were added to 88 parts of the premixed mother liquor. The mixture was dispersed in a high-speed disperser at 2000 r / min for 30 minutes and then sealed and stored in the dark for later use.

[0026] Natural mineral colorants: After crushing ochre, azurite or malachite raw materials, they are screened through a 200-250 mesh standard sieve and dried until the moisture content is ≤0.3% for later use. Specific implementation examples: Example 1: Plum blossom-shaped commemorative plaque (specifications: diameter 80mm, thickness 10mm) 1. Raw material ratio (by mass parts):

[0028] 2. Preparation steps: (1) Substrate pretreatment: Natural mineral powder processing: Mix the organic gemstone powder and inorganic gemstone powder in the above proportion evenly, put them in a vacuum drying oven, set the temperature to 65℃ and the vacuum degree to -0.08MPa, dry for 2.5 hours to remove moisture and volatile impurities, and cool to room temperature for later use.

[0029] Preparation of composite substrate powder: 35 parts of purified bone ash and 0.8 parts of ochre powder were put into a high-speed mixer, the speed was set to 3000 r / min, and the mixture was mixed for 5 minutes to obtain a composite substrate powder with uniform color (natural ochre color). After discharge, the powder was sealed and stored to prevent moisture absorption.

[0030] (2) Slurry preparation: Equipment preparation: Select a double planetary vacuum mixer (model: SFM-50), and clean the vessel body in advance to ensure that there are no impurities remaining.

[0031] Feeding and pre-mixing: The pretreated natural mineral powder and composite substrate powder are fed into the mixer body, the kettle door is closed, the vacuum pump is started to draw a vacuum to -0.08MPa, the vacuum state is maintained, the speed is set to 400r / min, and the mixture is pre-mixed for 6 minutes to make the powder fully dispersed and loose, and to break up the agglomerates.

[0032] Adhesive injection and mixing: Slowly inject 15 parts of mussel biomimetic composite adhesive through a metering pump. The injection process should last for 5 minutes to avoid generating air bubbles. After injection, adjust the stirring speed to 220 r / min and continue stirring for 20 minutes to allow the adhesive to fully impregnate and combine with the powder.

[0033] Viscosity adjustment: When stirring for 10 minutes and 15 minutes, add 1.5% of the total mass of raw materials in anhydrous ethanol in two batches (total addition amount 3%). After each addition, continue stirring until the ethanol is completely dispersed. Finally, adjust the slurry viscosity to 8000 mPa·s (using a rotational viscometer, model: NDJ-8S, test temperature 25℃).

[0034] Settling and Discharging: After mixing, maintain vacuum and let stand for 3 minutes to allow residual air bubbles in the slurry to float to the surface and be discharged; then transfer the uniform and dense slurry to a sealed storage tank through the pressurized discharge port (pressure 0.3MPa) for later use.

[0035] (3) Cavity casting type: Mold preparation: Select a composite mold consisting of a silicone inner mold (surface roughness Ra=0.5μm) and an aluminum alloy outer mold. The mold cavity is shaped like a plum blossom. Clean the cavity in advance, apply a layer of release agent (silane release agent), and let it dry for later use.

[0036] Slurry pouring: The slurry in the storage tank is injected into the mold cavity through the pouring funnel. The pouring height is controlled to be 2.5mm below the edge of the mold opening to avoid slurry overflow.

[0037] Smoothing and shaping: Use a stainless steel scraper to scrape away excess slurry horizontally along the open plane of the mold to make the slurry surface smooth; place the mold on a horizontal workbench and let it stand for 12 minutes in an environment of room temperature (23℃) and relative humidity of 50% to make the slurry initially set by the thixotropic properties of the adhesive, forming a green body with weak strength (compressive strength ≥0.5MPa) for easy subsequent transfer.

[0038] (4) Biomimetic cross-linking curing: Constant temperature and humidity curing activation: The mold after shaping is sent into a constant temperature and humidity curing chamber (model: HSX-150), the temperature is set at 60℃ and the relative humidity at 90%, and the curing time is 28 hours to activate the catechol groups in the adhesive and promote their pre-reaction with the hydroxyl groups on the substrate surface.

[0039] Preliminary drying: After curing, remove the mold and gently absorb the condensate on the surface of the mold with a lint-free cloth (do not touch the billet to prevent damage to the billet); place the mold in a ventilated drying oven, set the temperature to 45℃ and the wind speed to 1.5m / s, and dry for 1.5 hours to remove free moisture from the surface and near-surface of the billet, so that the moisture content of the billet is reduced to below 10%.

[0040] UV-induced crosslinking: Keep the mold open and place it under a UV curing machine. Use a UV lamp with a main wavelength of 365nm and adjust the irradiation intensity to 900mW / cm². 2 Irradiation distance 6cm, irradiation for 12 minutes, to initiate the copolymerization reaction of active monomers in the adhesive, forming a preliminary three-dimensional network structure and fixing the basic shape of the product.

[0041] Segmented thermosetting: After UV irradiation, the mold is transferred to an electric thermostatic oven. First, the temperature is set to 30℃ and pre-cured for 6 hours to allow the reaction to proceed slowly and remove residual gas. Then, the temperature is raised to 60℃ (heating rate 5℃ / h) and a second curing is carried out for 22 hours to ensure that the cross-linking reaction is completely completed and the network structure is densified. After curing, the oven is closed and allowed to cool naturally to room temperature.

[0042] (5) Post-processing finishing: Demolding: First remove the aluminum alloy outer mold, then use a plastic pry bar to gently pry along the gap between the silicone inner mold and the blank to slowly remove the blank, avoiding violent demolding that could cause the blank to crack or break at the edges.

[0043] Drying: Place the removed green body into a vacuum drying oven, set the temperature to 65℃ and the vacuum degree to -0.08MPa, and dry for 5 hours to completely remove residual moisture, so that the moisture content of the green body is ≤0.5%.

[0044] Wet sanding: Select 1000 grit, 1200 grit, and 1500 grit wet sandpaper in sequence and perform wet sanding on the sander. The sanding pressure is 0.2 MPa. During sanding, continuously spray deionized water to avoid dust generation. Sand with 1000 grit sandpaper until there are no obvious defects on the surface of the blank, sand with 1200 grit sandpaper until the surface is smooth, and sand with 1500 grit sandpaper until there are no sanding marks on the surface.

[0045] Polishing: Place the polished blank into a polishing machine, select a wool wheel, apply diamond polishing paste (1μm grit), set the speed to 1500r / min, and polish for 30 minutes until the surface gloss reaches 86GU (using a gloss meter, test angle 60°).

[0046] Laser engraving: Based on customer needs, fiber laser engraving machines are used to engrave the deceased's name, date of birth and death, and commemorative inscriptions on the surface of souvenirs. The engraving depth is 0.1mm, and the font is clear, beautiful, and burr-free.

[0047] 3. Performance Testing and Results: The finished product was tested according to the following standards, and the results are as follows:

[0048] Example 2: Oval Commemorative Ornament (Dimensions: Length 120mm × Width 80mm × Thickness 15mm) 1. Raw material ratio (by mass parts):

[0049] 2. Preparation steps: (1) Substrate pretreatment: Natural mineral powder processing: Mix tourmaline powder, amber powder, jade powder, and agate powder evenly, place them in a vacuum drying oven, dry at 65℃ and -0.08MPa for 2 hours, and cool to room temperature for later use.

[0050] Preparation of composite substrate powder: 40 parts of purified bone ash and 0.5 parts of azurite powder were put into a high-speed mixer and mixed at 3000r / min for 5 minutes to obtain a uniform blue composite substrate powder, which was then sealed and stored.

[0051] (2) Slurry preparation: Referring to the equipment and process in Example 1, the parameters were adjusted as follows: pre-stirring speed 380 r / min, time 7 minutes; after the binder was injected, stirring speed 230 r / min, time 21 minutes; anhydrous ethanol 3% of the total mass of raw materials was added in 3 batches, and the final slurry viscosity was adjusted to 7500 mPa·s (25℃); after vacuuming and standing for 3 minutes, the material was discharged.

[0052] (3) Cavity casting type: An elliptical composite mold (silicone inner mold Ra=0.4μm, aluminum alloy outer mold) was selected. After applying the release agent, the slurry was poured in, with the pouring height 2mm lower than the edge of the mold opening. After smoothing, the mold was left to stand for 14 minutes in an environment with a room temperature of 25℃ and a relative humidity of 55% to complete the initial shaping.

[0053] (4) Biomimetic cross-linking curing: Constant temperature and humidity curing: Temperature 62℃, relative humidity 88%, curing time 26 hours; Preliminary drying: temperature 50℃, wind speed 1.8m / s, drying for 1 hour; UV light-induced crosslinking: UV lamp irradiation intensity 850mW / cm 2 Irradiation distance 7cm, irradiation time 14 minutes; Segmented thermosetting: Pre-curing at 30℃ for 5.5 hours, secondary curing at 58℃ for 20 hours, and then naturally cooling to room temperature.

[0054] (5) Post-processing finishing: Demolding and drying: Same as in Example 1, drying temperature 65℃, time 4.5 hours; Wet sanding: Same as in Example 1, sanding with 1000 grit, 1200 grit, and 1500 grit wet sandpaper in sequence; Edge chamfering: A chamfering machine (model: DJ-30) is used to chamfer the edges of the blank to a 1.5mm × 45° angle, ensuring smooth edges without sharp corners; Polishing: Wool wheel polishing, final surface gloss 84 GU; Laser engraving: According to customer requirements, floral patterns are engraved on the front of the ornament (accuracy 0.01mm) and words are engraved on the back to complete the finished product.

[0055] 3. Performance Testing and Results:

[0056] As demonstrated by the two embodiments above, the natural mineral-cremation urn composite keepsake of the present invention, through precise control of raw material ratios and preparation processes, can stably produce products with a compressive strength ≥22MPa, elongation at break 8%-20%, and surface gloss ≥84GU. Furthermore, its performance remains stable after weather resistance testing, solving the problems of delamination, poor mechanical properties, and weak weather resistance found in traditional cremation urn keepsakes. Simultaneously, the use of a raw material system combining organic gemstones and inorganic jade imbues the product with profound cultural connotations and unique artistic beauty, allowing it to be crafted into various forms of commemorative items suitable for both indoor and outdoor long-term memorial occasions.

[0057] Those skilled in the art can adjust the types of natural minerals, the type of colorant, and the shape of the mold within the range of raw material ratios and process parameters defined in the claims of this invention, according to actual needs, and all can achieve the technical effects of this invention.

[0058] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A natural mineral cremated remains composite keepsake, characterized in that, By weight, it includes the following components: 50-65 parts natural mineral powder, 30-40 parts purified bone ash, 12-18 parts mussel biomimetic composite adhesive, and 0.3-1.5 parts natural mineral colorant.

2. The natural mineral cremated remains composite keepsake according to claim 1, characterized in that, The natural mineral powder is made by mixing organic gemstone powder and inorganic gemstone powder in a mass ratio of 1:1.2-1.

8.

3. The natural mineral cremated remains composite keepsake according to claim 2, characterized in that, The organic gemstone powder is selected from at least one of crystal, coral, giant clam shell, amber, and pearl, with a particle size of 120-180 mesh; The inorganic gemstone powder is selected from at least one of the following: Hetian jade, jadeite, turquoise, agate, ruby, sapphire, emerald, tourmaline, lapis lazuli, malachite, Dushan jade, Xiuyan jade, quartzite jade, Huanglong jade, Shoushan stone, and chicken blood stone, with a particle size of 150-200 mesh.

4. The natural mineral cremated remains composite keepsake according to claim 1, characterized in that, The mussel-inspired composite adhesive is composed of the following components in parts by weight: 88 parts of premixed mother liquor, 6 parts of silane coupling agent KH-5603-, and 4-8 parts of nano-hydroxyapatite; The premixed mother liquor is composed of the following components in parts by weight: 40 parts of 3,4-dihydroxyphenylmethacrylamide, 25 parts of isooctyl acrylate, 30 parts of isobornyl methacrylate, 1-2 parts of composite photoinitiator, 0.5-1 part of antioxidant, and 0.5-1 part of ultraviolet absorber; The nano-hydroxyapatite has a particle size of 50-80 nm.

5. The natural mineral cremated remains composite keepsake according to claim 4, characterized in that, The composite photoinitiator is a mixture of 2-hydroxy-2-methyl-1-phenyl-1-propanone and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide in a mass ratio of 1:

1.

6. The natural mineral cremated remains composite keepsake according to claim 4, characterized in that, The antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; the ultraviolet absorber is 2-(2'-hydroxy-3',5'-di-tert-pentylphenyl)benzotriazole.

7. The natural mineral cremated remains composite keepsake according to claim 1, characterized in that, The natural mineral colorant is selected from one or more of ochre, azurite, and malachite, with a particle size of 200-250 mesh.

8. The natural mineral cremated remains composite keepsake according to claim 1, characterized in that, The method for preparing purified cremated remains includes the following steps: drying the original cremated remains at 105-120℃ for 2-3 hours, pulverizing them to 180-220 mesh, soaking them in 0.5mol / L hydrochloric acid solution for 30-40 minutes, repeatedly washing them with deionized water until neutral, and then drying them at 110℃ for 1-2 hours.

9. A method for preparing a natural mineral cremated remains composite keepsake as described in any one of claims 1-8, characterized in that, Includes the following steps: (1) Substrate pretreatment: After the natural mineral powder is mixed evenly, it is dried in a vacuum drying oven at 60-70℃ for 2-3 hours; the purified bone ash and natural mineral colorant are mixed in a high-speed mixer at 3000r / min for 5 minutes to obtain composite substrate powder; (2) Vacuum mixing and slurry preparation: The composite substrate powder is put into a double planetary vacuum mixer, the vacuum is drawn to -0.08MPa, and the mixture is pre-mixed at 350-450r / min for 5-8 minutes. After injecting the mussel biomimetic composite adhesive, the speed is adjusted to 200-250r / min and the mixture is continuously stirred for 18-22 minutes. During this period, 2-4% of the total mass of the raw materials is added in 2-3 batches of anhydrous ethanol. The viscosity of the slurry is adjusted to 6000-9000mPa・s. After maintaining the vacuum and standing for 3 minutes, the material is discharged. (3) Molding and molding: Inject the slurry into the composite mold, smooth the surface, and let it stand at 20-25℃ for 10-15 minutes; (4) Biomimetic cross-linking curing: The process involves constant temperature and humidity curing activation, preliminary drying, ultraviolet light-induced cross-linking, and segmented thermal curing. (5) Post-processing and finishing: After demolding and drying, wet grinding and polishing are performed. Laser engraving or pattern engraving can be performed to obtain the finished product.

10. The preparation method according to claim 9, characterized in that, In step (4): the conditions for constant temperature and humidity curing and activation are a temperature of 55-65℃, a relative humidity of 85-95%, and a time of 24-30 hours; The preliminary drying conditions are a temperature of 40-50℃, a well-ventilated environment, and a time of 1-2 hours; The ultraviolet light-induced crosslinking is performed using an ultraviolet lamp with a dominant wavelength of 365 nm and an irradiation intensity of 800-1000 mW / cm². 2 Irradiation distance: 5-8cm; duration: 10-15 minutes; The segmented thermosetting process involves first pre-curing at 28-32℃ for 5-6 hours, and then raising the temperature to 55-65℃ for a second curing of 18-24 hours.

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