Light-storing bone-ash memorial and its stable dispersion preparation method

Abstract

This invention provides a photoluminescent cremated remains keepsake and its stable dispersion preparation method, belonging to the technical field of commemorative products. The keepsake comprises a composite system of cremated remains powder, a matrix binder, and a photoluminescent material. The photoluminescent material is selected from rare earth-doped, transition metal-doped sulfide, or all-inorganic metal halide systems, and can be uniformly dispersed in the bulk or selectively distributed on the functional surface layer, forming a composite structure of a substrate layer and a luminescent functional layer. The preparation method includes raw material pretreatment, premixing and dispersion protection, total mixing and molding, and post-curing treatment. Through premixing and dispersion protection combined with a step-by-step total mixing process, combined with anhydrous ethanol dispersion medium and precise process parameter control, stable bonding and uniform dispersion of the photoluminescent material and the cremated remains substrate are achieved. This invention overcomes the limitations of traditional cremated remains keepsakes with only one function. The product can emit a soft glow autonomously in a dark environment, combining emotional interaction and aesthetic value, and exhibits structural stability and long-lasting luminescence performance.

Description

Technical Field

[0001] This invention belongs to the field of commemorative items technology, and more specifically, relates to a photoluminescent cremated remains commemorative item and a method for its stable dispersion preparation. Background Technology

[0002] Cremated remains keepsakes, as a core carrier of remembrance, possess irreplaceable emotional value in social life. Current technologies for cremated remains keepsakes are mostly single-formed products such as urns, caskets, and plaques, whose function is limited to the storage and preservation of ashes. Not only are their functions singular, but they also lack the emotional interaction with those who mourn, resulting in low aesthetic value and failing to meet people's growing demands for personalized, emotional, and aesthetically pleasing keepsakes.

[0003] With the upgrading of commemorative concepts, phosphorescent and luminescent functions, due to their soft and tranquil visual qualities, have become an important direction for strengthening emotional connections. However, the combination of phosphorescent materials and cremated remains as keepsakes faces significant technical bottlenecks in the current technology: First, the composition of cremated remains substrates is complex (mainly containing calcium phosphate compounds such as hydroxyapatite and calcium phosphate) and has special particle characteristics. Existing phosphorescent materials are difficult to form a stable interface bonding system with cremated remains and commonly used matrix materials (natural binders, synthetic resins, inorganic cementing materials, etc.), easily leading to structural failures such as delamination and detachment. Second, phosphorescent materials are easily damaged by shear forces and high molding temperatures during the mixing process, resulting in damaged crystal structures, decreased luminescence performance, and difficulty in uniform dispersion, which cannot guarantee the stability and consistency of the luminescent effect. These problems directly limit the effective application of phosphorescent and luminescent functions in cremated remains as keepsakes. Therefore, there is an urgent need to develop a cremated remains keepake that can achieve a stable and uniform bonding between phosphorescent materials and cremated remains substrates, while also possessing emotional interaction and aesthetic value, along with corresponding preparation technologies. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a photoluminescent cremated remains keepsake and its stable dispersion preparation method. This solves the technical problems of traditional cremated remains keepsakes having limited functionality, lacking emotional interaction and aesthetic added value, as well as the poor bonding stability between existing photoluminescent materials and cremated remains substrates, easy delamination and detachment, and easy damage to the crystal structure, attenuation of luminescence performance, and uneven dispersion during mixing and molding.

[0005] A photoluminescent cremated remains keepsake, the raw materials of which include cremated remains powder, matrix binder and photoluminescent material.

[0006] Preferably, the raw material components are as follows by mass percentage: 30%-60% bone ash powder, 20%-50% matrix binder, and 5%-20% photoluminescent material.

[0007] Preferably, the photoluminescent material is selected from one or more of rare earth doped systems, transition metal doped sulfide systems, or all-inorganic metal halide systems; The rare-earth-doped photoluminescent material includes Eu. 2+ / Dy 3+ Co-doped strontium aluminate, Eu 2+ / Dy 3+ Co-doped strontium magnesium silicate, Eu 2+ / Dy 3+ Co-doped calcium magnesium silicate, Cr 3+ doped zinc germanium gallate, Pr 3+ / Al 3+ Co-doped calcium titanate; The transition metal doped sulfide system photoluminescent material includes Cu. 2+ / Co 2+ Co-doped zinc sulfide, Eu 2+ / Tm 3+ Co-doped calcium sulfide; The all-inorganic metal halide photoluminescent material is Cu. + Doped with silver rubidium bromide; The average particle size of the light-emitting material is 5-50 μm, and the emission color is yellow-green, blue-green, blue, or red.

[0008] Preferably, the light-emitting material is uniformly dispersed throughout the entire souvenir body, or dispersed in a specific functional surface layer of the souvenir.

[0009] Preferably, the matrix adhesive is selected from one or more of natural adhesives, synthetic organic resins, inorganic cementing materials, or inorganic-organic composite adhesives; The natural binders include animal glue, shellac, and dextrin; The synthetic organic resins include epoxy resins, polyurethane resins, phenolic resins, acrylic resins, and cyanoacrylates; The inorganic cementitious materials include cement, inorganic silicate binders, phosphate binders, and aluminate binders; The inorganic-organic composite binder is an epoxidized soybean oil-based bio-adhesive.

[0010] Another technical problem to be solved by the present invention is to provide a method for preparing photoluminescent cremated remains keepsakes, comprising the following steps: mixing photoluminescent material, cremated remains powder and matrix adhesive to form a composite mixture; molding and curing the composite mixture.

[0011] Preferably, the mixing step includes premixing and final mixing: first, the photoluminescent material is premixed with 1 / 3 to 1 / 2 of the mass of bone ash powder to obtain a premixed mixture; The premixed materials are then mixed with the matrix binder and the remaining bone ash powder to form a composite mixture.

[0012] Preferably, the specific process of premixing is as follows: add 3%-5% anhydrous ethanol as a dispersion medium to the mixture of photoluminescent material and 1 / 3-1 / 2 mass of bone ash powder, grind in a planetary low-speed ball mill at a speed of 50-80 r / min for 5-8 min, and then dry in an environment of 80-100℃ to remove anhydrous ethanol. The total mixing speed is 200-300 r / min, and the mixing time is 10-15 min.

[0013] Preferably, the molding method is die casting or molding, the molding temperature is 50-80℃, the molding pressure is 5-15MPa, the holding time is 3-8min, and the environmental conditions for the curing step are: temperature 25-50℃, relative humidity 40%-60%, and curing time 24-48h.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention, through the design of a composite system of cremated remains, matrix adhesive, and photoluminescent material, enables the keepsake to emit soft yellow-green, blue-green, blue, and red light autonomously in a dark environment. It breaks through the single-function limitation of traditional cremated remains keepsakes, which are only used for storage and preservation, and achieves a dual enhancement of emotional interaction and aesthetic value. It allows mourners to feel the "spiritual companionship" of the deceased in a dark environment, significantly enhancing the specialness of the memorial and the depth of emotional connection, and solving the problem of the lack of emotional interaction in existing products.

[0015] The innovative preparation method employs a pre-mixed dispersion protection + stepwise total mixing process. Combined with the introduction of anhydrous ethanol as the dispersion medium and precise control of parameters such as mixing speed, molding temperature (50-80℃), and pressure (5-15MPa), it effectively avoids crystal structure damage to the photoluminescent material during preparation and achieves uniform dispersion in the composite system. The product exhibits uniform luminescence brightness and an afterglow time of 8-12 hours. After thermal cycling tests, no delamination or peeling was observed, and the luminescence brightness decay rate is ≤5%. This completely solves the core pain points of existing technologies, such as unstable bonding between the photoluminescent material and the bone urn substrate and luminescence performance degradation.

[0016] The composite system has excellent compatibility and can flexibly adjust the content of each component, the type of photoluminescent material (rare earth doping, transition metal doping, all-inorganic metal halide, etc.), the type of matrix binder (natural, synthetic organic, inorganic, bio-based, etc.) and the luminescent color according to actual needs. It is suitable for various product forms such as commemorative plaques, commemorative ornaments, and small commemorative jewelry, and can meet the personalized commemorative needs in different scenarios, with a wide range of applications. Attached Figure Description

[0017] Figure 1 This is a schematic flowchart of the preparation method of the present invention. Detailed Implementation

[0018] The following detailed description of the photoluminescent cremated remains keepsake and its stable dispersion preparation method, with reference to specific embodiments, further illustrates the present invention. The scope of protection of the present invention is not limited by the following embodiments. All equivalent transformations or modifications made based on the technical solutions of the present invention fall within the scope of protection of the present invention.

[0019] Example 1: Eu 2+ / Dy 3+ Photoluminescent Cremation Urn Plaques Based on Co-doped Strontium Aluminate-Epoxy Resin System The photoluminescent cremated remains commemorative plaque prepared in this embodiment is a yellow-green luminescent plaque, using epoxy resin as the matrix adhesive, Eu 2+ / Dy 3+ Co-doped strontium aluminate is used as a light-generating material, as detailed below: 1. Raw material preparation (total mass 100g): Core commemorative ingredient: 45g of cremated remains powder (45% of total mass), which is made from the cremated remains of the deceased after pretreatment; Matrix adhesive: 35g of bisphenol A type epoxy resin (35% of the total mass), as a molding and bonding carrier; Photoluminescent component: Eu 2+ / Dy 3+ 20g of co-doped strontium aluminate photoluminescent material (accounting for 20% of the total mass) has an average particle size of 20μm and emits a yellow-green light. Dispersion medium: 1.5g of anhydrous ethanol, accounting for 4% of the total mass of the phosphorescent material and part of the bone ash mixture.

[0020] 2. Preparation steps: (1) Raw material pretreatment: Cremated bone ash pretreatment: The original cremated bone ash was placed in a vacuum drying oven at 90℃ and dried for 3 hours to reduce the moisture content to 1.2% (≤2% standard requirement); then the dried cremated bone ash was put into a planetary ball mill for pulverization, and after pulverization, it was passed through a 150-mesh standard sieve to collect cremated bone ash powder with uniform particle size for later use. Pretreatment of photoluminescent materials: Eu with an average particle size of 20 μm was selected. 2+ / Dy 3+ The co-doped aluminate photoluminescent material was pre-dried in a 110℃ forced-air drying oven for 2.5 hours to completely remove surface adsorbed water and residual impurities, thereby improving its interfacial compatibility and bonding strength with the cremation urn substrate, and then set aside for use.

[0021] (2) Premixed dispersion protection: 20g of pre-dried photoluminescent material and 15g of bone ash powder (accounting for 1 / 3 of the total bone ash mass) were added together into a planetary low-speed ball mill, followed by 1.5g of anhydrous ethanol as a dispersion medium. The ball mill speed was set to 60r / min, and the mixture was ground for 6min. The anhydrous ethanol reduced the agglomeration force between particles, while the bone ash powder formed a physical coating and protection for the photoluminescent material particles. After grinding, the mixture was placed in a 90℃ oven and dried for 40min to remove the anhydrous ethanol, resulting in a premixed mixture for later use.

[0022] (3) Overall mixing and molding: The premixed materials were transferred to a high-speed mixer, and 35g of bisphenol A epoxy resin and the remaining 30g of bone ash powder were added. The high-speed mixer was set to a speed of 250r / min and stirred for 12min to fully integrate the components and form a uniform composite mixture. According to the pre-designed shape and size of the commemorative plaque, the composite mixture was injected into a custom commemorative plaque mold and formed by die casting. During the molding process, the process parameters were strictly controlled: molding temperature 65℃ (lower than the heat resistance limit of the photoluminescent material), molding pressure 10MPa, and holding time 5min to ensure the compactness and structural stability of the blank.

[0023] (4) Post-curing treatment: The molded blank is placed in a constant temperature and humidity environment of 35℃ and 50% relative humidity for 36 hours to cure (meeting the curing time requirement of 24-48 hours); after curing, the post-processing steps are carried out in sequence: first, coarse grinding is performed with 800-grit sandpaper to remove obvious surface defects; then fine grinding is performed with 2000-grit sandpaper to refine the surface roughness; finally, polishing is performed to obtain a smooth yellow-green luminous commemorative plaque.

[0024] 3. Performance test results: Luminous performance: Self-luminous brightness in dark environments ≥150mcd / m² 2 The afterglow lasted for 11 hours; Structural stability: After 10 cycles of thermal cycling (-20℃ to 50℃), the commemorative plaque showed no delamination or peeling, and the luminous brightness attenuation rate was ≤5%; Appearance quality: The surface is smooth and flawless, the luminescent material is evenly dispersed, and the luminous effect is consistent.

[0025] Example 2: Cr 3+ Photoluminescent cremated remains in zinc gallate-germanium cement system The photoluminescent cremated remains keepsake prepared in this embodiment is a red-light luminescent ornament, using ordinary silicate cement as the matrix binder, Cr 3+ The use of zinc germanium gallate doping as a light-generating material is as follows: 1. Raw material preparation (total mass 100g): Core commemorative ingredient: 55g of cremated remains powder (55% of total mass), which is made from the cremated remains of the deceased after pretreatment; Matrix binder: 35g of ordinary Portland cement (35% of the total mass), as an inorganic cementitious molding carrier; Photoluminescent component: Cr 3+ 10g of zinc gallate germanium photoluminescent material (accounting for 10% of the total mass) has an average particle size of 30μm and emits red light. Dispersion medium: 0.8g anhydrous ethanol, accounting for 3% of the total mass of the phosphorescent material and part of the bone ash mixture; Auxiliary molding agent: 5g of deionized water, used to adjust the fluidity of the cement system.

[0026] 2. Preparation steps: (1) Raw material pretreatment: Cremated bone ash pretreatment: Place the original cremated bone ash in a vacuum drying oven at 100℃ for 2 hours to dry it until the moisture content is reduced to 0.8% (≤2% standard requirement); then put it into a planetary ball mill for pulverization, and after pulverization, pass it through a 120-mesh standard sieve to collect the uniformly sized cremated bone ash powder for later use; Pretreatment of photoluminescent materials: Cr with an average particle size of 30 μm was selected. 3+ The zinc gallate germanium photoluminescent material was pre-dried in a 120℃ forced-air drying oven for 2 hours to remove surface adsorbed water and improve interfacial adhesion, and then set aside for use.

[0027] (2) Premixed dispersion protection: 10g of pre-dried photoluminescent material and 27.5g of bone ash powder (accounting for 1 / 2 of the total bone ash mass) were added to a planetary low-speed ball mill, and 0.8g of anhydrous ethanol was added as a dispersion medium. The ball mill speed was set to 50r / min and the grinding was carried out for 8min to achieve the initial dispersion and physical encapsulation of the photoluminescent material. After grinding, the mixture was placed in a 100℃ oven and dried for 30min to remove the anhydrous ethanol, and the premixed material was obtained for later use.

[0028] (3) Overall mixing and molding: The premixed materials were transferred to a high-speed mixer, and 35g of ordinary Portland cement, the remaining 27.5g of bone ash powder and 5g of deionized water were added. The speed of the high-speed mixer was set to 200r / min, and the mixture was stirred for 15min to form a uniform composite mixture. The mixture was filled into the mold and molded by compression molding. The molding process parameters were controlled as follows: molding temperature 50℃, molding pressure 15MPa, and holding time 8min to ensure that the green body structure was dense.

[0029] (4) Post-curing treatment: The molded blank is placed in a constant temperature and humidity environment of 25℃ and 60% relative humidity for 48 hours to cure. After curing, it is subjected to coarse grinding, fine grinding and polishing in sequence to remove surface cracks and defects, and a red light luminous ornament is obtained.

[0030] 3. Performance test results: Luminous performance: Self-luminous brightness in dark environments ≥80mcd / m 2 Afterglow lasts for 8 hours; Mechanical properties: compressive strength ≥25MPa, meeting the structural strength requirements during the use of the ornament; Appearance and dispersibility: The surface is free of cracks, the light-gathering material is uniformly dispersed in the matrix, and the red light emission effect is stable and consistent.

[0031] Example 3: Cu + Photoluminescent miniature commemorative ornaments based on a silver bromide-rubidium rubidium-epoxy soybean oil bio-adhesive system The photoluminescent cremated remains keepsake prepared in this embodiment is a small blue-light luminescent ornament, using an epoxy soybean oil-based bio-adhesive as the matrix binder, Cu + Rubidium silver bromide, when used as a light-generating material, combines biocompatibility and aesthetics, as detailed below: 1. Raw material preparation (total weight 100g): Core commemorative ingredient: 30g of cremated remains powder (30% of total mass), which is made from the cremated remains of the deceased after pretreatment; Matrix binder: 55g of epoxidized soybean oil-based bio-binder (55% of total mass), with good biocompatibility and no release of toxic or harmful substances; Light storage functional component: Cu + 15g of silver bromide rubidium photoluminescent material (accounting for 15% of the total mass) with an average particle size of 10μm and emitted blue light; Dispersion medium: 1.2g of anhydrous ethanol, accounting for 5% of the total mass of the phosphorescent material and part of the bone ash mixture.

[0032] 2. Preparation steps: (1) Raw material pretreatment: Cremated bone ash pretreatment: The original cremated bone ash was placed in an 80℃ vacuum drying oven and dried for 3 hours to reduce the moisture content to 1.5% (≤2% standard requirement); then it was put into a planetary ball mill for pulverization, and after pulverization, it was passed through a 200-mesh standard sieve to collect ultrafine cremated bone ash powder with uniform particle size for later use. Pretreatment of photoluminescent materials: Cu with an average particle size of 10 μm was selected. + The silver bromide rubidium photoluminescent material is pre-dried in a 100℃ forced-air drying oven for 3 hours to completely remove surface adsorbed water and impurities, thereby improving its compatibility with bio-adhesives and bone ash, and is ready for use.

[0033] (2) Premixed dispersion protection: Add 15g of pre-dried photoluminescent material and 10g of bone ash powder (accounting for 1 / 3 of the total bone ash mass) to a planetary low-speed ball mill, and add 1.2g of anhydrous ethanol as a dispersion medium; set the ball mill speed to 80r / min and grind for 5min to achieve uniform dispersion and encapsulation protection of the photoluminescent material; after grinding, place the mixture in an 80℃ oven to dry for 50min to remove the anhydrous ethanol, and obtain the premixed material for later use.

[0034] (3) Overall mixing: The premixed materials were transferred to a high-speed mixer, and 55g of epoxidized soybean oil-based bio-adhesive and the remaining 20g of bone ash powder were added. The high-speed mixer was set to a speed of 300r / min and stirred for 10min to form a uniform composite mixture. The mixture was then injected into a small jewelry mold and formed by die casting. The molding process parameters were controlled as follows: molding temperature 80℃, molding pressure 5MPa, and holding time 3min, to meet the precision molding requirements of small jewelry.

[0035] (4) Post-curing treatment: The molded blank is placed in a constant temperature and humidity environment of 50℃ and 40% relative humidity for 24 hours to cure. After curing, it is finely polished to remove minor surface imperfections and obtain a smooth blue luminescent small commemorative ornament.

[0036] Performance test results: Luminous performance: Self-luminous brightness in dark environments ≥120mcd / m² 2 The afterglow lasts for 9 hours; Biocompatibility: Good biocompatibility, no release of toxic or harmful substances, and meets the safety requirements for the use of jewelry; Appearance quality: Surface smoothness ≥0.8μm, light-emitting material is uniformly dispersed, and blue light emission is soft and stable.

[0037] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the invention. In practical applications, the mass percentage of each raw material component, the type of phosphorescent material, the type of matrix adhesive, molding process parameters, and product form (such as commemorative plaques, ornaments, jewelry, etc.) can be flexibly adjusted according to commemorative needs. All equivalent transformations or modifications made based on the technical solution of the present invention fall within the protection scope of the present invention.

[0038] 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 photoluminescent cremated remains keepsake, characterized in that, Its raw materials include bone ash powder, matrix binder and photoluminescent material.

2. A method for preparing a photoluminescent cremated remains keepsake as described in claim 1, characterized in that, The process includes the following steps: mixing photoluminescent material, bone ash powder and matrix binder to form a composite mixture; molding and curing the composite mixture.

3. The photoluminescent cremated remains keepsake according to claim 1, characterized in that, The raw material components, by mass percentage, are: bone ash powder 30%-60%, matrix binder 20%-50%, and photoluminescent material 5%-20%.

4. The photoluminescent cremated remains keepsake according to claim 1 or 3, characterized in that, The photoluminescent material is selected from one or more of rare earth doped systems, transition metal doped sulfide systems, or all inorganic metal halide systems. The rare-earth-doped photoluminescent material includes Eu. 2+ / Dy 3+ Co-doped strontium aluminate, Eu 2+ / Dy 3+ Co-doped strontium magnesium silicate, Eu 2+ / Dy 3+ Co-doped calcium magnesium silicate, Cr 3+ doped zinc germanium gallate, Pr 3+ / Al 3+ Co-doped calcium titanate; The transition metal doped sulfide system photoluminescent material includes Cu. 2+ / Co 2+ Co-doped zinc sulfide, Eu 2+ / Tm 3+ Co-doped calcium sulfide; The all-inorganic metal halide photoluminescent material is Cu. + Doped with silver rubidium bromide; The average particle size of the light-emitting material is 5-50 μm, and the emission color is yellow-green, blue-green, blue, or red.

5. The photoluminescent cremated remains keepsake according to claim 1, characterized in that, The light-emitting material is uniformly dispersed throughout the entire souvenir body, or dispersed in a specific functional surface layer of the souvenir.

6. The photoluminescent cremated remains keepsake according to claim 1, characterized in that, The matrix adhesive is selected from one or more of natural adhesives, synthetic organic resins, inorganic cementitious materials, or inorganic-organic composite adhesives; The natural binders include animal glue, shellac, and dextrin; The synthetic organic resins include epoxy resins, polyurethane resins, phenolic resins, acrylic resins, and cyanoacrylates; The inorganic cementitious materials include cement, inorganic silicate binders, phosphate binders, and aluminate binders; The inorganic-organic composite binder is an epoxidized soybean oil-based bio-adhesive.

7. The preparation method according to claim 2, characterized in that, The mixing step includes premixing and final mixing: first, the photoluminescent material is premixed with 1 / 3 to 1 / 2 of the mass of bone ash powder to obtain a premixed mixture; The premixed materials are then mixed with the matrix binder and the remaining bone ash powder to form a composite mixture.

8. The preparation method according to claim 7, characterized in that, The specific process of premixing is as follows: add 3%-5% anhydrous ethanol as a dispersion medium to the mixture of photoluminescent material and 1 / 3-1 / 2 mass of bone ash powder, grind it in a planetary low-speed ball mill at a speed of 50-80 r / min for 5-8 min, and then dry it in an environment of 80-100℃ to remove the anhydrous ethanol. The total mixing speed is 200-300 r / min, and the mixing time is 10-15 min.

9. The preparation method according to claim 2, characterized in that, The molding method is die casting or molding, the molding temperature is 50-80℃, the molding pressure is 5-15MPa, and the holding time is 3-8min.

10. The preparation method according to claim 2, characterized in that, The environmental conditions for the curing step are: temperature 25-50℃, relative humidity 40%-60%, and curing time 24-48h.

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