A method for decorating a precious metal surface with mother-of-pearl and applications thereof

Abstract

This invention discloses a method and application for mother-of-pearl inlay on precious metal surfaces, relating to the field of precious metal jewelry processing technology. The mother-of-pearl inlay method includes the following steps: pre-reserving a groove on the surface of the precious metal for attaching the mother-of-pearl piece; applying a glazing agent to the groove; placing the mother-of-pearl piece in the groove to adhere it to the glazing agent; the glazing agent consists of 40-65% glaze and 35-60% fusion agent by mass, the fusion agent consisting of 95-98% dimethyl-4,4-methylenedicyclohexylamine and 2-5% ethyl methanesulfonate by mass; baking the precious metal with the mother-of-pearl piece attached in an environment of 50-60°C for 8-12 hours; and cooling it in an environment of 23-25°C and 35-40% humidity for 2-3 hours to obtain the finished product. The precious metal surface mother-of-pearl inlay method of the present invention can firmly bond the precious metal and the mother-of-pearl sheet, and the composite layer formed by the combination of the mother-of-pearl sheet and the gilding material will not produce appearance defects such as bubbles and color difference, and has good light transmittance, so that the gilding of the bottom layer can be seen through the mother-of-pearl sheet.

Description

Technical Field

[0001] This invention relates to the field of precious metal jewelry processing technology, and in particular to a method and application of mother-of-pearl inlay on precious metal surfaces. Background Technology

[0002] Mother-of-pearl inlay, also known as snail shell inlay, snail-filled inlay, inlaid inlay, clam shell inlay, and garland snail inlay, is a unique traditional Chinese art treasure. Mother-of-pearl inlay refers to the decorative technique of using thin pieces of mother-of-pearl and seashells, ground into shapes resembling figures, flowers, birds, geometric patterns, or characters, which are then inlaid onto the surface of objects according to the design. Because mother-of-pearl is a natural material with an inherently beautiful appearance and a strong visual impact, it is one of the most common traditional decorative arts, widely used in lacquerware, furniture, musical instruments, screens, boxes, dishes, wood carvings, and related handicrafts.

[0003] The gilding technique is an ancient traditional painting technique that incorporates modern and rich color materials. The gilding material is applied to the surface of precious metals at room temperature or by heating, enhancing the surface decoration and showcasing more colorful, vibrant, and long-lasting colors.

[0004] The jewelry market is increasingly demanding diverse colors. To enhance the design and production of jewelry with multiple elements and dimensions, applying mother-of-pearl or gilding to precious metals is one way to meet consumer needs and improve the aesthetics of jewelry. For example, patent CN117284020A discloses a processing technique for mother-of-pearl shell flowers, which involves melting a hot-melt film and then attaching the shell flower pattern to the mother-of-pearl body to be processed. CN117652759A discloses a method for processing gold gilded jewelry, which involves coating a mixture of colored resin onto gold and baking it to solidify and form gilded stones. In addition, there are some jewelry pieces on the market that combine mother-of-pearl and gilding. They are generally made using the following two methods: 1) Gilding is first applied to the surface of the precious metal. After the gilding is baked and cured, mother-of-pearl pieces are glued to the surface of the gilding layer with an adhesive. With this manufacturing process, the mother-of-pearl pieces on the jewelry do not need to go through the baking process, which can avoid the problem of deformation of the mother-of-pearl pieces during the baking process. However, jewelry made with this process has no halo on the decorative parts and presents a matte state. Moreover, the adhesive layer between the gilding and the mother-of-pearl pieces will affect the light transmittance of the gilding. In addition, jewelry made with this process also has problems such as the adhesive layer oxidizing and turning black, weakening adhesion, poor corrosion resistance, easy color difference, and even excessive levels of harmful substances. 2) Adding an adhesive to the glaze creates an adhesive glaze, which is then applied to the surface of precious metal. Mother-of-pearl pieces are then attached to the glaze and baked to cure. While this process avoids the light transmission problem caused by the adhesive layer between the glaze and the mother-of-pearl, the glaze usually cannot meet the adhesion requirements for bonding both precious metal and mother-of-pearl simultaneously. Furthermore, air bubbles are prone to appearing in the glaze, resulting in poor appearance. In addition, if the adhesive is not selected properly, the glaze may oxidize and turn black after prolonged wear, and it may also have poor corrosion resistance.

[0005] Therefore, how to combine mother-of-pearl and gilding on precious metals to solve the above problems and ensure the long-term wear effect for consumers is a technical challenge for precious metal jewelry. Summary of the Invention

[0006] This invention provides a method for manufacturing a composite layer of mother-of-pearl and gilding techniques on the surface of precious metal jewelry. Research has revealed that this manufacturing process has high requirements for the gilding material, composed of glaze and binder. On one hand, the gilding material determines the adhesion between the gilding material and the precious metal and mother-of-pearl pieces; on the other hand, it determines the baking and curing temperature. If the curing temperature is too high, the mother-of-pearl pieces are prone to deformation during baking. If low-temperature or room-temperature curing is used, production efficiency is low and adhesion is unstable. When the compatibility of the glaze and binder is low, problems such as oxidation and blackening, and poor corrosion resistance still exist. Furthermore, in this manufacturing process, the cooling conditions significantly affect the color difference and the formation of bubbles in the composite layer formed by the combination of mother-of-pearl and gilding techniques.

[0007] The objective of this invention is achieved through the following technical solution: providing a method for mother-of-pearl inlay on a precious metal surface, comprising the following steps in sequence:

[0008] The abalone shell or snail shell is heated and softened, then flattened and polished into a thin sheet with a thickness of 0.1-0.3mm. The thin sheet is then cut into mother-of-pearl pieces of the desired shape.

[0009] A groove for attaching mother-of-pearl pieces is pre-reserved on the surface of a precious metal; a gilding pigment is applied into the groove, and the mother-of-pearl pieces are placed in the groove to adhere to the gilding pigment; the gilding pigment consists of 40-65% glaze and 35-60% fusion agent by mass, and the fusion agent consists of 95-98% dimethyl-4,4-methylenebicyclohexylamine and 2-5% ethyl methanesulfonate by mass.

[0010] The precious metal to which the mother-of-pearl is attached is baked in an environment of 50-60°C for 8-12 hours; preferably 8-10 hours.

[0011] After baking, place the product in an environment with a temperature of 23-25℃ and a humidity of 35-40% for 2-3 hours to cool and obtain the finished product.

[0012] Preferably, the fusion agent consists of 94% by mass of dimethyl-4,4-methylenebicyclohexylamine and 4% by mass of ethyl methanesulfonate.

[0013] The preparation method of gilded pigment includes the following steps: According to the preparation amount, the fusion agent is poured into a container, the corresponding glaze is added, and the mixture is stirred with a glass rod until the glaze and fusion agent are completely mixed until there are no air bubbles on the surface and inside, thus obtaining the gilded pigment. In actual production, the effective time of the gilded pigment is 30 minutes; it cannot be used after 30 minutes.

[0014] Furthermore, the glaze is a red glaze, and the gilding material is composed of 50% red glaze and 50% binder by mass.

[0015] Alternatively, the glaze is a blue glaze, and the gilding material is composed of 40% blue glaze and 60% binder by mass.

[0016] Alternatively, the glaze is a green glaze, and the glazing material is composed of 40% green glaze and 60% binder by mass.

[0017] Alternatively, the glaze is a celadon glaze, and the gilding material is composed of 60% celadon glaze and 40% binder by mass.

[0018] Alternatively, the glaze is a mixed color glaze, and the glaze is composed of 65% mixed color glaze and 35% binder by mass; the mixed color glaze is made by mixing blue glaze, green glaze and cyan glaze.

[0019] Preferably, the mixed glaze is made by mixing blue glaze, green glaze and cyan glaze in a mass ratio of 1:(1-2):(1-2).

[0020] Furthermore, the heating softening specifically refers to softening in water at 50-60℃ for 4-6 hours.

[0021] Preferably, the thickness of the sheet is 0.15-0.25 mm. More preferably, the thickness of the sheet is 0.2 ± 0.02 mm.

[0022] Preferably, the grinding is performed using a grinding wheel machine.

[0023] Preferably, the precious metal is gold, platinum, or gold.

[0024] The present invention also provides a precious metal ornament, the surface of which is provided with mother-of-pearl inlay using the above-described mother-of-pearl inlay method.

[0025] This invention relates to a method for mother-of-pearl inlay on precious metal surfaces, employing a composite process of mother-of-pearl inlay and gilding. The selected gilding material, after baking and cooling, exhibits strong oxidation and corrosion resistance, enabling it to firmly bond the precious metal and mother-of-pearl sheets and prevent the mother-of-pearl sheets from falling off. Furthermore, through the selection of the gilding material and the control of baking and cooling conditions, the composite layer formed by the combination of the mother-of-pearl sheets and the gilding material will not produce defects such as bubbles or color differences, and has good light transmittance, allowing the gilding of the underlying layer to be seen through the mother-of-pearl sheets. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0027] Figure 1The thin slice of abalone shell after grinding in Example 9 of this invention.

[0028] Figure 2 This refers to the mother-of-pearl sheet in Embodiment 9 of the present invention.

[0029] Figure 3 This is the gold bracelet before mother-of-pearl inlay in Embodiment 9 of the present invention.

[0030] Figure 4 This is a gold bracelet after being coated with gilded pigment in Embodiment 9 of the present invention.

[0031] Figure 5 This is a gold bracelet with mother-of-pearl inlay attached, as shown in Embodiment 9 of the present invention.

[0032] Figure 6 This is the gold bracelet mother-of-pearl inlaid ornament of Embodiment 9 of the present invention.

[0033] Figure 7 These are photographs of the mother-of-pearl 1.0 sample before and after the fracture strength test of the present invention.

[0034] Figure 8 These are photographs of the mother-of-pearl 2.0 sample before and after the fracture strength test of the present invention.

[0035] Figure 9 The gold mother-of-pearl inlaid ornaments of Example 10 and Comparative Example 14. Detailed Implementation

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0038] In the following embodiments, abalone shells were ground into thin slices using a grinding wheel. The glaze was selected from 200-mesh ultrafine cloisonné enamel glaze. The preparation method of the glazing agent was as follows: dimethyl-4,4-methylenedicyclohexylamine and ethyl methanesulfonate were mixed in a specific mass ratio to prepare a fusing agent; the fusing agent was measured according to the preparation amount and poured into a container, followed by the corresponding glaze. A glass rod was used to stir the mixture until there were no air bubbles on the surface or inside, thus obtaining the glazing agent. In actual production, the effective time for the glazing agent is 30 minutes; it cannot be used after 30 minutes.

[0039] Example 1

[0040] The abalone shells are heated and softened, then flattened and polished into thin sheets with a thickness of 0.1mm. The sheets are then cut into mother-of-pearl pieces of the desired shape.

[0041] A groove for attaching mother-of-pearl pieces is made on the gold surface; a gilding pigment is applied to the groove, and the mother-of-pearl pieces are placed in the groove while the gilding pigment is semi-dry, so that the mother-of-pearl pieces adhere to the gilding pigment; the gilding pigment consists of 40% blue glaze and 60% fusion agent by mass, wherein the fusion agent consists of 95% dimethyl-4,4-methylenebicyclohexylamine and 5% ethyl methanesulfonate by mass.

[0042] The gold with the attached mother-of-pearl pieces was baked at 50°C for 12 hours.

[0043] After baking, place the product in an environment with a temperature of 24±1℃ and a humidity of 35-40% for 2 hours to cool and obtain gold mother-of-pearl inlaid jewelry.

[0044] Example 2

[0045] The abalone shells are heated and softened, then flattened and polished into thin sheets with a thickness of 0.3mm. The sheets are then cut into mother-of-pearl pieces of the desired shape.

[0046] A groove for attaching mother-of-pearl pieces is made on the platinum surface; a gilding enamel is applied to the groove, and the mother-of-pearl pieces are placed in the groove while the gilding enamel is semi-dry, so that the mother-of-pearl pieces adhere to the gilding enamel; the gilding enamel consists of 40% green glaze and 60% fusion agent by mass, wherein the fusion agent consists of 98% dimethyl-4,4-methylenebicyclohexylamine and 2% ethyl methanesulfonate by mass.

[0047] Platinum with attached mother-of-pearl pieces was baked at 60°C for 8 hours.

[0048] After baking, place the product in an environment with a temperature of 24±1℃ and a humidity of 35-40% for 3 hours to cool and obtain platinum mother-of-pearl jewelry.

[0049] Example 3

[0050] The abalone shells are heated and softened, then flattened and polished into thin sheets with a thickness of 0.2mm. The sheets are then cut into mother-of-pearl pieces of the desired shape.

[0051] A groove for attaching mother-of-pearl pieces is made on a platinum surface; a gilding enamel is applied to the groove, and the mother-of-pearl pieces are placed in the groove while the gilding enamel is semi-dry, so that the mother-of-pearl pieces adhere to the gilding enamel; the gilding enamel consists of 60% by mass of blue glaze and 40% by mass of a binder, wherein the binder consists of 96% by mass of dimethyl-4,4-methylenebicyclohexylamine and 4% by mass of ethyl methanesulfonate;

[0052] Platinum with attached mother-of-pearl pieces was baked at 55°C for 9 hours.

[0053] After baking, place the product in an environment with a temperature of 24±1℃ and a humidity of 35-40% for 2.5 hours to cool and obtain platinum mother-of-pearl jewelry.

[0054] Example 4

[0055] The abalone shells are heated and softened, then flattened and polished into thin sheets with a thickness of 0.15mm. The sheets are then cut into mother-of-pearl pieces of the desired shape.

[0056] A groove for attaching mother-of-pearl pieces is made on the gold surface; a gilding pigment is applied to the groove, and the mother-of-pearl pieces are placed in the groove while the gilding pigment is semi-dry, so that the mother-of-pearl pieces adhere to the gilding pigment; the gilding pigment consists of 65% by mass of mixed color glaze and 35% by mass of a binder, the mixed color glaze is made by mixing blue glaze, green glaze and cyan glaze in a mass ratio of 1:1:1, and the binder consists of 97% by mass of dimethyl-4,4-methylenebicyclohexylamine and 3% by mass of ethyl methanesulfonate;

[0057] The gold with the attached mother-of-pearl pieces was baked at 58°C for 10 hours.

[0058] After baking, place the product in an environment with a temperature of 24±1℃ and a humidity of 35-40% for 3 hours to cool and obtain gold mother-of-pearl inlaid jewelry.

[0059] Example 5

[0060] The abalone shells are heated and softened, then flattened and polished into thin sheets with a thickness of 0.1mm. The sheets are then cut into mother-of-pearl pieces of the desired shape.

[0061] A groove for attaching mother-of-pearl pieces is made on the gold surface; a gilding pigment is applied to the groove, and the mother-of-pearl pieces are placed in the groove while the gilding pigment is semi-dry, so that the mother-of-pearl pieces adhere to the gilding pigment; the gilding pigment consists of 40% red (silver coral red) glaze and 60% fusion agent by mass, wherein the fusion agent consists of 95% dimethyl-4,4-methylene dicyclohexylamine and 5% ethyl methanesulfonate by mass;

[0062] The gold with the attached mother-of-pearl pieces was baked at 50°C for 12 hours.

[0063] After baking, place the product in an environment with a temperature of 24±1℃ and a humidity of 35-40% for 2 hours to cool and obtain gold mother-of-pearl inlaid jewelry.

[0064] Example 6

[0065] The abalone shells are heated and softened, then flattened and polished into thin sheets with a thickness of 0.3mm. The sheets are then cut into mother-of-pearl pieces of the desired shape.

[0066] A groove for attaching mother-of-pearl pieces is made on the gold surface; a gilding enamel is applied to the groove, and the mother-of-pearl pieces are placed in the groove while the gilding enamel is semi-dry, so that the mother-of-pearl pieces adhere to the gilding enamel; the gilding enamel consists of 40% red (silver coral red) glaze and 60% fusion agent by mass, wherein the fusion agent consists of 98% dimethyl-4,4-methylene dicyclohexylamine and 2% ethyl methanesulfonate by mass.

[0067] The gold with the attached mother-of-pearl pieces was baked at 60°C for 8 hours.

[0068] After baking, place the product in an environment with a temperature of 24±1℃ and a humidity of 35-40% for 3 hours to cool and obtain gold mother-of-pearl inlaid jewelry.

[0069] Example 7

[0070] The abalone shells are heated and softened, then flattened and polished into thin sheets with a thickness of 0.2mm. The sheets are then cut into mother-of-pearl pieces of the desired shape.

[0071] A groove for attaching mother-of-pearl pieces is made on the gold surface; a gilding pigment is applied to the groove, and the mother-of-pearl pieces are placed in the groove while the gilding pigment is semi-dry, so that the mother-of-pearl pieces adhere to the gilding pigment; the gilding pigment consists of 60% red (silver coral red) glaze and 40% fusion agent by mass, wherein the fusion agent consists of 96% dimethyl-4,4-methylene dicyclohexylamine and 4% ethyl methanesulfonate by mass;

[0072] The gold with the attached mother-of-pearl pieces was baked at 55°C for 9 hours.

[0073] After baking, place the product in an environment with a temperature of 24±1℃ and a humidity of 35-40% for 2.5 hours to cool and obtain the gold mother-of-pearl inlaid jewelry.

[0074] Example 8

[0075] The abalone shells are heated and softened, then flattened and polished into thin sheets with a thickness of 0.15mm. The sheets are then cut into mother-of-pearl pieces of the desired shape.

[0076] A groove for attaching mother-of-pearl pieces is made on the gold surface; a gilding enamel is applied to the groove, and the mother-of-pearl pieces are placed in the groove while the gilding enamel is semi-dry, so that the mother-of-pearl pieces adhere to the gilding enamel; the gilding enamel consists of 65% red (silver coral red) glaze and 35% fusion agent by mass, wherein the fusion agent consists of 97% dimethyl-4,4-methylene dicyclohexylamine and 3% ethyl methanesulfonate by mass.

[0077] The gold with the attached mother-of-pearl pieces was baked at 58°C for 10 hours.

[0078] After baking, place the product in an environment with a temperature of 24±1℃ and a humidity of 35-40% for 3 hours to cool and obtain gold mother-of-pearl inlaid jewelry.

[0079] Example 9

[0080] The abalone shells are heated to soften them, then flattened and polished into thin slices with a thickness of 0.12 mm (e.g., ...). Figure 1 As shown), then cut the thin sheet into the desired shape of mother-of-pearl (as shown). Figure 2 (as shown);

[0081] Recesses for attaching mother-of-pearl pieces are created on the surface of the gold bracelet (such as...). Figure 3 (as shown); apply glazing pigment (such as...) into the groove. Figure 4 As shown), when the gilding pigment is semi-dry, place the mother-of-pearl piece in the groove to allow the mother-of-pearl piece to adhere to the gilding pigment (as shown). Figure 5 (As shown); the glazing material consists of 50% red (silver coral red) glaze and 50% fusion agent by mass, wherein the fusion agent consists of 96% dimethyl-4,4-methylene dicyclohexylamine and 4% ethyl methanesulfonate by mass.

[0082] The gold bracelet with attached mother-of-pearl pieces was baked at 55°C for 10 hours.

[0083] After baking, cool in an environment with a temperature of 24±1℃ and a humidity of 35-40% for 2 hours to obtain gold bracelet mother-of-pearl inlaid jewelry (such as...). Figure 6 (As shown).

[0084] 1) Fracture strength test

[0085] Test samples: mother-of-pearl sheets (thickness 0.15mm)*2; gilded pigment (Example 9).

[0086] Testing instrument: Universal testing machine.

[0087] The test results are shown in Table 1 below:

[0088] Table 1

[0089]

[0090]

[0091] Photos of the mother-of-pearl 1.0 sample before and after testing are as follows: Figure 7 As shown; photos of the mother-of-pearl 2.0 sample before and after testing are as follows. Figure 8 As shown.

[0092] 2) Neutral salt spray test (96h)

[0093] Test method: Refer to GB / T 10125-2021.

[0094] 3) High temperature resistance test

[0095] Test conditions: 40-80℃, bake for 10 minutes at every 10℃, observe the decorative area of ​​the sample. If the mother-of-pearl pieces are not deformed or fall off, and the composite layer formed by the combination of mother-of-pearl pieces and gilding material is free from discoloration, bubbles, fogging, or (edge) blackening, it is considered to pass.

[0096] The mother-of-pearl ornaments of Examples 1-9 were subjected to neutral salt spray test and high temperature resistance test, and the results are shown in Table 2 below.

[0097] Table 2

[0098]

[0099] The test results in Table 2 above show that the mother-of-pearl inlaid jewelry made using the mother-of-pearl inlay method of this invention has strong high-temperature resistance and corrosion resistance. Therefore, even after long-term wear, it will not deform, fall off, change color, bubble, fog, or turn black, ensuring the long-term wear effect for consumers.

[0100] 4) Detection of total harmful elements and leaching amount of harmful elements in mother-of-pearl.

[0101] The total amount of harmful elements in the mother-of-pearl inlaid gold bracelet sample from Example 9 was tested for the amount of harmful elements leached out.

[0102] Testing Unit: Shenzhen Institute of Metrology and Quality Inspection

[0103] Report Number: WT20103241003581WT1

[0104] Inspection period: January 9, 2024 to January 16, 2024

[0105] Testing environmental conditions: Temperature (15~25)℃, Humidity (40~60)%RH

[0106] Judgment basis: Refer to the provisions of GB 28480-2012 on the limits of harmful elements in jewelry.

[0107] Testing standards: GB / T 28021-2011 Determination of harmful elements in jewelry - Spectroscopic method; GB / T28019-2011 Determination of hexavalent chromium in jewelry - Diphenylcarbazide spectrophotometric method.

[0108] The test results are shown in Tables 3 and 4 below.

[0109] Table 3 Total content of harmful elements

[0110] Total content of harmful element hexavalent chromium mg / kg ≤1000 Not detected conform to Total content of harmful element arsenic mg / kg ≤1000 Not detected conform to Total content of harmful element cadmium mg / kg ≤100 Not detected conform to Total content of harmful element mercury mg / kg ≤1000 Not detected conform to Total content of harmful element lead mg / kg ≤1000 Not detected conform to

[0111] Table 4. Leaching Amount of Harmful Elements

[0112] Leaching amount of harmful element antimony (Sb) mg / kg ≤60 Not detected conform to Leaching amount of harmful element arsenic (As) mg / kg ≤25 Not detected conform to leachation of harmful element barium (Ba) mg / kg ≤1000 Not detected conform to Leaching amount of harmful element cadmium (Cd) mg / kg ≤75 Not detected conform to Leaching amount of harmful element chromium (Cr) mg / kg ≤60 Not detected conform to Leaching amount of harmful element lead (Pb) mg / kg ≤90 Not detected conform to Dissolution of harmful element mercury (Hg) mg / kg ≤60 Not detected conform to Leaching amount of harmful element selenium (Se) mg / kg ≤500 Not detected conform to

[0113] During the development of this process, comparative experiments were also conducted on other gold jewelry under different process conditions, as detailed below.

[0114] Comparative Example 1: The mother-of-pearl sheet thickness is 0.4 mm, and the other steps are the same as in Example 9.

[0115] Comparative Example 2: The glazing material consists of 30% red (silver coral red) glaze and 70% fusion agent by mass, and the other steps are the same as in Example 9.

[0116] Comparative Example 3: The glaze consists of 70% red (silver coral red) glaze and 30% fusion agent by mass, and the other steps are the same as in Example 9.

[0117] Comparative Example 4: The fusion agent consisted of 90% by mass of dimethyl-4,4-methylenebicyclohexylamine and 10% by mass of ethyl methanesulfonate, and the other steps were the same as in Example 9.

[0118] Comparative Example 5: The fusion agent consisted of 99% dimethyl-4,4-methylenebicyclohexylamine and 1% ethyl methanesulfonate by mass, and the other steps were the same as in Example 9.

[0119] Comparative Example 6: The fusion agent was dimethyl-4,4-methylenebicyclohexylamine, and the other steps were the same as in Example 9.

[0120] Comparative Example 7: Gold jewelry with mother-of-pearl attached was baked at 70°C for 10 hours, with other steps being the same as in Example 9.

[0121] Comparative Example 8: Gold jewelry with mother-of-pearl attached was baked at 45°C for 12 hours, with other steps the same as in Example 9.

[0122] Comparative Example 9: After baking, the product was placed in an environment with a temperature of 24±1℃ and a humidity of 60-70% to cool for 2 hours. Other steps were the same as in Example 9.

[0123] Comparative Example 10: After baking, the product was placed in an environment with a temperature of 24±1℃ and a humidity of 25-30% to cool for 2 hours. Other steps were the same as in Example 9.

[0124] Comparative Example 11: After baking, the product was placed in an environment with a temperature of 15±1℃ and a humidity of 35-40% to cool for 1 hour. Other steps were the same as in Example 9.

[0125] Comparative Example 12: After baking, the product was placed in an environment with a temperature of 30±1℃ and a humidity of 35-40% to cool for 2 hours. Other steps were the same as in Example 9.

[0126] The mother-of-pearl ornaments of Comparative Examples 1-15 were compared with the mother-of-pearl ornament of Example 9 to evaluate the light transmission effect of the mother-of-pearl decorative area (i.e., the lower layer gilding effect presented through the mother-of-pearl sheet; if the light transmission effect was not as good as that of Example 9, it was considered unacceptable). The mother-of-pearl ornaments of Comparative Examples 1-15 were subjected to neutral salt spray test and high temperature resistance test, and the results are as follows: 5.

[0127] Table 5

[0128]

[0129]

[0130] Example 10 and Comparative Example 14

[0131] Example 10 is a gold mother-of-pearl inlaid ornament made according to the process of Example 9 of the present invention, such as... Figure 9 As shown in the upper left. Comparative Example 14 shows existing mother-of-pearl inlaid ornaments on the market (the surface is coated with gilding, and after the gilding is baked and cured, the mother-of-pearl pieces are glued to the surface of the gilding layer with adhesive), such as... Figure 9 As shown in the lower right corner, the existing mother-of-pearl inlaid ornaments have inferior light transmission and luster compared to the gold mother-of-pearl inlaid ornaments produced by the process of Example 9 of this invention.

[0132] The above test results show that the precious metal surface mother-of-pearl inlay method of the present invention uses a gilding material with strong oxidation resistance and corrosion resistance after baking and cooling, which can firmly bond the precious metal and the mother-of-pearl sheet and prevent the mother-of-pearl sheet from falling off. Moreover, by selecting the gilding material and controlling the baking and cooling conditions, the composite layer formed by the combination of the mother-of-pearl sheet and the gilding material will not produce appearance defects such as bubbles or color difference. It has good light transmittance and can show the gilding of the bottom layer through the mother-of-pearl sheet, ensuring the long-term wearing effect for consumers.

[0133] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for mother-of-pearl inlay on a precious metal surface, characterized in that, The steps are as follows: The abalone shells are heated and softened, then flattened and polished into thin sheets with a thickness of 0.1-0.3mm. The sheets are then cut into mother-of-pearl pieces of the desired shape. A groove is pre-reserved on the surface of the precious metal for attaching mother-of-pearl pieces; a gilding enamel is applied into the groove, and the mother-of-pearl pieces are placed in the groove so that they adhere to the gilding enamel; the gilding enamel is composed of 40-65% glaze and 35-60% fusion agent by mass, the fusion agent is composed of 95-98% dimethyl-4,4-methylene dicyclohexylamine and 2-5% ethyl methanesulfonate by mass, and the glaze is selected from 200-mesh ultra-fine cloisonné enamel glaze; Place the precious metal with the mother-of-pearl attached in an environment of 50-60℃ and bake for 8-12 hours; After baking, place the product in an environment with a temperature of 23-25℃ and a humidity of 35-40% for 2-3 hours to cool and obtain the finished product.

2. The method for mother-of-pearl inlay on precious metal surfaces according to claim 1, characterized in that, The fusion agent consists of 96% by mass of dimethyl-4,4-methylenebicyclohexylamine and 4% by mass of ethyl methanesulfonate.

3. The method for mother-of-pearl inlay on precious metal surfaces according to claim 2, characterized in that, The glaze is a red glaze, and the gilding material is composed of 50% red glaze and 50% binder by mass. Alternatively, the glaze is a blue glaze, and the gilding material is composed of 40% blue glaze and 60% binder by mass. Alternatively, the glaze is a green glaze, and the glazing material is composed of 40% green glaze and 60% binder by mass. Alternatively, the glaze is a celadon glaze, and the enamel is composed of 60% celadon glaze and 40% binder by mass. Alternatively, the glaze is a mixed color glaze, and the glaze is composed of 65% mixed color glaze and 35% binder by mass; the mixed color glaze is made by mixing blue glaze, green glaze and cyan glaze.

4. The method for mother-of-pearl inlay on precious metal surfaces according to claim 1, characterized in that, The heating and softening process specifically involves softening the water at 50-60℃ for 4-6 hours.

5. The method for mother-of-pearl inlay on precious metal surfaces according to claim 4, characterized in that, The thickness of the sheet is 0.15-0.25 mm.

6. The method for mother-of-pearl inlay on precious metal surfaces according to claim 5, characterized in that, The thickness of the sheet is 0.2 ± 0.02 mm.

7. The method for mother-of-pearl inlay on precious metal surfaces according to claim 6, characterized in that, The grinding process is performed using a grinding wheel machine.

8. The method for mother-of-pearl inlay on precious metal surfaces according to claim 1, characterized in that, The precious metal mentioned is gold, platinum, or gold.

9. A precious metal ornament, characterized in that, Its surface is provided with mother-of-pearl inlay using the mother-of-pearl inlay method as described in any one of claims 1-8.

Images