Treatment method for improving durability of silver ornament

Abstract

The invention relates to the technical field of silver ornament processing, in particular to a treatment method for improving durability of silver ornaments.The treatment method comprises the steps that the silver ornamentsare cleaned, dried and soaked in epoxy resin, the silver ornamentsare soaked in transparent film liquid, and the silver ornamentsare placed in an ultraviolet lamp box with the humidity ranging from 66% to 88% to be subjected to bilateral UV irradiation reaction and dried. According to the method, the silver ornament and the external environment are effectively isolated, the silver ornament is prevented from being damaged and collided by collision external force when the silver ornament is worn, and sweat and microbial secretions on the skin surface are prevented from eroding the silver ornament and affecting the appearance of the silver ornament. Moreover, the film layer with excellent mechanical quality can avoid or reduce the damage of the silver ornament even if the silver ornament is obviously rubbed or scratched during transportation and storage, so that the modeling lines of the silver ornament are well protected, and the use value and the artistic value of the silver ornament are continued.

Description

Technical Field

[0001] The invention relates to the technical field of silver ornament processing, and in particular to a processing method for improving the durability of silver ornaments. Background Art

[0002] Silver jewelry is a kind of jewelry made of metal silver. It has a smooth texture and rich luster. It is a common type of ethnic handicraft. It is mainly divided into earrings, necklaces, hand jewelry, foot jewelry and clothing. Silver jewelry has high artistic value and economic value. Since silver is a relatively active precious metal, it is very easy to react with sulfur or hydrogen sulfide in the air to generate black silver sulfide, which causes the silver jewelry to turn black after use. In addition, the blackening phenomenon is more serious due to the friction on the surface of silver jewelry used for a long time. The value of silver jewelry after blackening and wear is reduced. Therefore, in order to ensure the appearance of silver jewelry, it is necessary to take a variety of measures. The existing technology mainly includes the following: (1) Surface treatment: This is an industrial method that is not easy for individuals to adopt and is prone to wear and tear of the surface pattern of silver jewelry; (2) Surface coating treatment: A layer of transparent varnish film is applied to the surface of the jewelry to isolate the silver from the outside air. Ordinary wearers can use colorless and transparent nail polish to apply a coating on the jewelry. This method is particularly simple and does not affect the luster of silver jewelry. It is a relatively common way to protect silver jewelry. However, the current coating liquid used in silver jewelry has insufficient tension and low strength. In actual storage or transportation of silver jewelry, it is easy to cause the film to rupture, resulting in the silver jewelry being exposed to the air, causing the surface of the silver jewelry to become black and worn. Therefore, how to protect silver jewelry needs further research. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings existing in the prior art. In view of the problems existing in the prior art, a processing method for improving the durability of silver jewelry is provided. By constructing a film with high strength and good stability on the surface of the silver jewelry, the silver jewelry can be completely isolated from the air during use and storage, thereby ensuring that the appearance of the silver jewelry remains unchanged for a long time.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for improving the durability of silver ornaments comprises the following steps:

[0006] (1) Wash and dry the silver ornaments, pour epoxy resin into a container, immerse the silver ornaments in the epoxy resin, soak for 1-2 seconds, take them out, and dry them to fix the shape;

[0007] (2) soaking the silver ornaments in the transparent film liquid for 10-15 seconds; the preparation method of the transparent film liquid is as follows: taking 80-90 parts by mass of isocyanate-terminated polyurethane, 1-2 parts of aziridine, 3-5 parts of sorbitol glycidyl ether, 10-17 parts of resistant particles, 0.1-0.27 parts of 1-hydroxycyclohexyl phenyl ketone, and 0.2-0.34 parts of pentamethyldiethylenetriamine, mixing the mixture with 100-120 parts of dichloromethane, and stirring the mixture at 80-88° C. for 19-22 minutes;

[0008] (3) placing the silver ornaments in a UV light box with a humidity of 66%-88% for double-sided UV irradiation reaction, and then drying to obtain treated silver ornaments.

[0009] Furthermore, the silver ornament is any one of a bracelet, an anklet, and a necklace.

[0010] Furthermore, the method for preparing the resistant particles is as follows:

[0011] In parts by mass, 1-3 parts of yttrium nitrate, 12-24 parts of aluminum chloride, 3-5 parts of potassium chloride, 8-10 parts of magnesium chloride, and 8-10 parts of zinc chloride are added to 300-400 parts of pure water, heated until dissolved, stirred for 8-9 minutes, 50-80 parts of boron nitride nanotubes and 20-36 parts of graphene are added, and stirring is continued for 15-18 minutes; under magnetic stirring, 80-100 parts of calcium hydroxide solution are added, and after the reaction is stable, the upper solution is discarded, leaving the precipitate; the precipitate is washed with pure water 2-3 times;

[0012] Under vacuum, calcine the precipitate at 300-450°C for 80-90 min to obtain dried powder, continue to heat the powder to 1200-1300°C, calcine for 3-4 h, put the calcined powder into a ball mill, and ball mill for 7-8 h;

[0013] The ball mill slurry was dried at 100-120°C, cooled to room temperature, and then γ-glycidyloxypropyltrimethoxysilane was added and stirred at 30-33°C for 20-26 minutes.

[0014] Furthermore, the magnetic stirring speed is 130-150 rpm.

[0015] Furthermore, the calcium hydroxide solution is a saturated solution.

[0016] Furthermore, the solvent used in the ball milling is ethanol.

[0017] Furthermore, the amount of the γ-glycidyloxypropyltrimethoxysilane used is 3-6% of the mass of the powder.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The method of the present invention forms a complete and stable film layer on the surface of silver jewelry, effectively isolating the silver jewelry from the external environment, preventing the silver jewelry from being damaged or knocked by external forces when wearing the silver jewelry, and preventing sweat and microbial secretions on the skin surface from corroding the silver jewelry and affecting the appearance of the silver jewelry. Moreover, the film layer with excellent mechanical quality can prevent or reduce the damage of the silver jewelry even if it is subjected to obvious friction or scratches during transportation and storage, so that the shape and texture of the silver jewelry are well protected, and the use value and artistic value of the silver jewelry are continued.

[0020] The present invention cleans and dries the silver ornaments and soaks and shapes them in epoxy resin to form a preliminary film layer, which is conducive to the subsequent adsorption and wall hanging of the film liquid, so that the film layer on the surface of the silver ornaments has more buffer space to cope with the impact of external factors on the silver ornaments; then the silver ornaments are soaked in a transparent film liquid to form a final stable film layer, and the two layers have good fusion and high fit, providing good protection for the silver ornaments. In the preparation of the transparent film liquid, isocyanate-terminated polyurethane, aziridine, sorbitol glycidyl ether, resistant particles, 1-hydroxycyclohexyl phenyl ketone, pentamethyldiethylenetriamine, and dichloromethane are used to form a stable and uniform film liquid, so that the silver ornaments can be well contacted with the film layer molecular network, and a complete film layer is formed on the surface. The silver ornaments are dried by double-sided UV irradiation reaction in an ultraviolet light box, and the surface film layer is firmly shaped, so that the surface of the silver ornaments has a film body with good mechanical properties. The silver ornaments of the present invention are any one of bracelets, anklets, and collars, mainly because these silver ornaments are simple in shape, which is convenient for film liquid wrapping and molding.

[0021] In the preparation of the resistant particles of the present invention, yttrium nitrate, aluminum chloride, potassium chloride, magnesium chloride and zinc chloride are added to pure water to form a salt solution, and boron nitride nanotubes and graphene are added to fully adsorb so that various raw materials are evenly mixed; under magnetic stirring, calcium hydroxide solution is added, and after the reaction is stable, an alkaline precipitate is formed, and an oxide is obtained after heating, and the calcination is continued to obtain ceramic resistant particles, which are put into a ball mill and ball-milled into nano-scale resistant powder, and γ-glycidyloxypropyltrimethoxysilane is added to make the resistant powder and the membrane liquid mixed more evenly, so that the integrity of the prepared membrane is higher and the wrapping of the silver ornaments is tighter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a test diagram of the wear resistance of the surface film of the silver ornaments of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Example 1

[0025] A method for improving the durability of silver ornaments comprises the following steps:

[0026] (1) washing and drying the silver ornaments, pouring epoxy resin into a container, soaking the silver ornaments in the epoxy resin, soaking for 1 second, taking them out, and drying them to shape; the silver ornaments are bracelets;

[0027] (2) soaking the silver ornaments in the transparent film liquid for 10 seconds; the preparation method of the transparent film liquid is as follows: by weight, 80 parts of isocyanate-terminated polyurethane, 1 part of aziridine, 3 parts of sorbitol glycidyl ether, 10 parts of resistant particles, 0.1 parts of 1-hydroxycyclohexyl phenyl ketone, and 0.2 parts of pentamethyldiethylenetriamine are mixed, mixed with 100 parts of dichloromethane, and stirred at 80° C. for 19 minutes;

[0028] The method for preparing the resistant particles is as follows:

[0029] In parts by mass, 1 part of yttrium nitrate, 12 parts of aluminum chloride, 3 parts of potassium chloride, 8 parts of magnesium chloride, and 8 parts of zinc chloride are added to 300 parts of pure water, heated until dissolved, stirred for 8 minutes, 50 parts of boron nitride nanotubes and 20 parts of graphene are added, and stirring is continued for 15 minutes; under magnetic stirring, 80 parts of calcium hydroxide solution are added, and after the reaction is stable, the upper solution is discarded, leaving the precipitate; the precipitate is washed twice with pure water;

[0030] Under vacuum, the precipitate was calcined at 300°C for 80 min to obtain a dried powder, and the powder was further heated to 1200°C and calcined for 3 h. The calcined powder was placed in a ball mill and ball-milled for 7 h.

[0031] The ball mill slurry was dried at 100°C, cooled to room temperature, and γ-glycidyloxypropyltrimethoxysilane was added, and stirred at 30°C for 20 min;

[0032] The magnetic stirring speed is 130 rpm, the calcium hydroxide solution is a saturated solution, and the solvent used in the ball milling is ethanol; the amount of γ-glycidyloxypropyltrimethoxysilane is 3% of the powder mass;

[0033] (3) The silver ornaments are placed in a UV light box with a humidity of 66% for double-sided UV irradiation reaction, and then dried to obtain treated silver ornaments.

[0034] Example 2

[0035] A method for improving the durability of silver ornaments comprises the following steps:

[0036] (1) washing and drying the silver ornaments, pouring epoxy resin into a container, soaking the silver ornaments in the epoxy resin, soaking for 2 seconds, taking them out, and drying them to shape; the silver ornaments are any one of bracelets, anklets, and necklaces;

[0037] (2) soaking the silver ornaments in the transparent film liquid for 15 seconds; the preparation method of the transparent film liquid is as follows: by weight, 90 parts of isocyanate-terminated polyurethane, 2 parts of aziridine, 5 parts of sorbitol glycidyl ether, 17 parts of resistant particles, 0.27 parts of 1-hydroxycyclohexyl phenyl ketone, and 0.34 parts of pentamethyldiethylenetriamine are mixed, mixed with 120 parts of dichloromethane, and stirred at 88° C. for 22 minutes;

[0038] The method for preparing the resistant particles is as follows:

[0039] In parts by mass, 3 parts of yttrium nitrate, 24 parts of aluminum chloride, 5 parts of potassium chloride, 10 parts of magnesium chloride, and 10 parts of zinc chloride are added to 400 parts of pure water, heated until dissolved, stirred for 9 minutes, 80 parts of boron nitride nanotubes and 36 parts of graphene are added, and stirring is continued for 18 minutes; under magnetic stirring, 100 parts of calcium hydroxide solution are added, and after the reaction is stable, the upper solution is discarded, leaving the precipitate; the precipitate is washed 3 times with pure water;

[0040] Under vacuum, the precipitate was calcined at 450°C for 90 min to obtain a dried powder, the powder was further heated to 1300°C and calcined for 4 h, the calcined powder was placed in a ball mill and ball milled for 8 h;

[0041] The ball mill slurry was dried at 120°C, cooled to room temperature, and γ-glycidyloxypropyltrimethoxysilane was added, and stirred at 33°C for 26 minutes;

[0042] The magnetic stirring speed is 150 rpm, the calcium hydroxide solution is a saturated solution, and the solvent used in the ball milling is ethanol; the amount of γ-glycidyloxypropyltrimethoxysilane used is 6% of the powder mass;

[0043] (3) The silver ornaments are placed in an ultraviolet light box with a humidity of 88% for double-sided UV irradiation reaction, and then dried to obtain treated silver ornaments.

[0044] Example 3

[0045] A method for improving the durability of silver ornaments comprises the following steps:

[0046] (1) washing and drying the silver ornaments, pouring epoxy resin into a container, soaking the silver ornaments in the epoxy resin, soaking for 2 seconds, taking them out, and drying them to shape; the silver ornaments are necklaces;

[0047] (2) soaking the silver ornaments in the transparent film liquid for 13 seconds; the preparation method of the transparent film liquid is as follows: by weight, taking 88 parts of isocyanate-terminated polyurethane, 2 parts of aziridine, 4 parts of sorbitol glycidyl ether, 17 parts of resistant particles, 0.27 parts of 1-hydroxycyclohexyl phenyl ketone, and 0.2 parts of pentamethyldiethylenetriamine, mixing them with 120 parts of dichloromethane, and stirring at 88° C. for 19 minutes;

[0048] The method for preparing the resistant particles is as follows:

[0049] In parts by mass, 3 parts of yttrium nitrate, 12 parts of aluminum chloride, 5 parts of potassium chloride, 10 parts of magnesium chloride, and 8 parts of zinc chloride were added to 400 parts of pure water, heated until dissolved, stirred for 8 minutes, 80 parts of boron nitride nanotubes and 20 parts of graphene were added, and stirring was continued for 18 minutes; under magnetic stirring, 80 parts of calcium hydroxide solution were added, and after the reaction was stable, the upper solution was discarded, leaving the precipitate; the precipitate was washed with pure water 3 times;

[0050] Under vacuum, the precipitate was calcined at 450°C for 80 min to obtain a dried powder, the powder was further heated to 1300°C and calcined for 3 h, the calcined powder was placed in a ball mill and ball milled for 8 h;

[0051] The ball mill slurry was dried at 120°C, cooled to room temperature, and γ-glycidyloxypropyltrimethoxysilane was added, and stirred at 30°C for 26 minutes;

[0052] The magnetic stirring speed is 130 rpm, the calcium hydroxide solution is a saturated solution, and the solvent used in the ball milling is ethanol; the amount of γ-glycidyloxypropyltrimethoxysilane used is 6% of the powder mass;

[0053] (3) The silver ornaments are placed in a UV light box with a humidity of 78% for double-sided UV irradiation reaction, and then dried to obtain treated silver ornaments.

[0054] Example 4

[0055] A method for improving the durability of silver ornaments comprises the following steps:

[0056] (1) washing and drying the silver ornaments, pouring epoxy resin into a container, soaking the silver ornaments in the epoxy resin, soaking for 1 second, taking them out, and drying them to shape; the silver ornaments are bracelets;

[0057] (2) soaking the silver ornaments in the transparent film liquid for 10 seconds; the preparation method of the transparent film liquid is as follows: by weight, 80 parts of isocyanate-terminated polyurethane, 2 parts of aziridine, 5 parts of sorbitol glycidyl ether, 17 parts of resistant particles, 0.27 parts of 1-hydroxycyclohexyl phenyl ketone, and 0.34 parts of pentamethyldiethylenetriamine are mixed, mixed with 120 parts of dichloromethane, and stirred at 88° C. for 22 minutes;

[0058] The method for preparing the resistant particles is as follows:

[0059] In parts by mass, 3 parts of yttrium nitrate, 24 parts of aluminum chloride, 5 parts of potassium chloride, 10 parts of magnesium chloride, and 8 parts of zinc chloride are added to 300 parts of pure water, heated until dissolved, stirred for 8 minutes, 50 parts of boron nitride nanotubes and 20 parts of graphene are added, and stirring is continued for 15 minutes; under magnetic stirring, 80 parts of calcium hydroxide solution are added, and after the reaction is stable, the upper solution is discarded, leaving the precipitate; the precipitate is washed twice with pure water;

[0060] Under vacuum, the precipitate was calcined at 450°C for 90 min to obtain a dried powder, the powder was further heated to 1300°C and calcined for 4 h, the calcined powder was placed in a ball mill and ball milled for 8 h;

[0061] The ball mill slurry was dried at 120°C, cooled to room temperature, and γ-glycidyloxypropyltrimethoxysilane was added, and stirred at 33°C for 26 minutes;

[0062] The magnetic stirring speed is 150 rpm, the calcium hydroxide solution is a saturated solution, and the solvent used in the ball milling is ethanol; the amount of γ-glycidyloxypropyltrimethoxysilane used is 6% of the powder mass;

[0063] (3) The silver ornaments are placed in an ultraviolet light box with a humidity of 85% for double-sided UV irradiation reaction, and then dried to obtain treated silver ornaments.

[0064] Experimental example

[0065] 1. In order to verify the stability of the film of the present invention, comparative example 1 is set, in which boron nitride nanotubes are replaced with nano silicon nitride in the preparation of the resistant particles, and other operations are the same as those in Example 1; comparative example 2 is set, in which yttrium nitrate is not used in the preparation of the resistant particles, and other operations are the same as those in Example 1. Epoxy resin is sprayed on a glass plate, and after drying and curing, the transparent film liquid of Examples 1-4 and Comparative Examples 1-2 is sprayed on the epoxy resin layer, and the film layer is peeled off after curing according to the operation, and the wear resistance of the film is tested. The test standard is GB / T 1768-2006, and the unit is mg / 1000r; 5 film samples are prepared in each group.

[0066] The epoxy resin used is a highly transparent epoxy resin provided by Wenzhou Wangtai New Materials Co., Ltd.; the boron nitride is provided by Angxing New Carbon Materials Changzhou Co., Ltd.

[0067] Depend on Figure 1 It can be seen that the wear amount of Examples 1-4 prepared according to the method of the present invention is significantly lower than that of Comparative Examples 1 and 2. Obviously, the film layer structure used in the silver jewelry of the present invention is more stable, has a good steady-state structure in actual use, can isolate the silver jewelry from the external environment, and effectively protect the silver jewelry.

[0068] Since yttrium has very good stability to high temperatures, it can enhance the hardness and strength of ceramics and improve their fracture toughness. It has good stability to acids, alkalis and other chemical substances and can enhance the corrosion resistance of ceramics. In Comparative Example 2, yttrium nitrate was not used, resulting in no incorporation of yttrium oxide in the subsequent production of resistant particles. The high-temperature stability, hardness and strength of the resistant particles were affected, resulting in reduced stability of the transparent film liquid and reduced wear resistance after film formation. Therefore, the test results are significantly lower than those of Examples 1-4.

[0069] Boron nitride nanotubes have a very high elastic modulus. Due to the low activation energy of defects, boron nitride nanotubes have stable mechanical qualities even when environmental factors such as temperature change dramatically. Therefore, using them to make ceramicized resistant particles can significantly improve the resistance of particles in a changing environment. In addition, the hydrophobicity of the resistant particles can be significantly improved, so that the wear resistance of the film layer of the prepared film-protected silver jewelry can still be maintained at an excellent level in actual use even when the temperature rises and falls sharply. It can also be shielded when encountering water wetting intrusion, acid and alkali and other water-soluble corrosive components to ensure that the silver jewelry is not corroded; in addition, nanotube boron nitride can adsorb molecular chains and ceramic powders to form a stable network structure. Therefore, due to the lack of boron nitride nanotubes in Comparative Example 1, its wear resistance is significantly reduced.

[0070] In the manufacturing process of ceramics, adding yttrium can improve the processing performance of ceramics. By adding yttrium, the sintering temperature and time of ceramics can be reduced, and the energy consumption and time cost in ceramic processing can be reduced.

[0071] 1. Practical use test of the present invention

[0072] Three users aged 55-58 were selected to protect the Zhenhui Silver 999 pure silver according to Example 1 of the present invention. The bracelet weighed 34g. The users wore the bracelet on their right hands for no less than 25 days per month to avoid external damage. After wearing for 8 months, the bracelet was taken back for inspection. Sweat stains and dandruff accumulated on the surface of the bracelet, but the surface film of all the bracelets was not broken, and the surface of the silver ornaments was still as bright as before.

[0073] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for improving the durability of silver jewelry, characterized in that: The steps include: (1) Wash and dry the silver ornaments, pour epoxy resin into a container, immerse the silver ornaments in the epoxy resin, soak for 1-2 seconds, take them out, and dry them to fix the shape; (2) soaking the silver ornaments in the transparent film liquid for 10-15 seconds; the preparation method of the transparent film liquid is as follows: taking 80-90 parts by mass of isocyanate-terminated polyurethane, 1-2 parts of aziridine, 3-5 parts of sorbitol glycidyl ether, 10-17 parts of resistant particles, 0.1-0.27 parts of 1-hydroxycyclohexyl phenyl ketone, and 0.2-0.34 parts of pentamethyldiethylenetriamine, mixing the mixture with 100-120 parts of dichloromethane, and stirring the mixture at 80-88° C. for 19-22 minutes; (3) placing the silver ornaments in a UV light box with a humidity of 66%-88% for double-sided UV irradiation reaction, and then drying to obtain treated silver ornaments.

2. The method for improving the durability of silver jewelry according to claim 1, characterized in that: The silver ornaments are any one of a bracelet, an anklet, and a necklace.

3. The method for improving the durability of silver jewelry according to claim 1, characterized in that: The method for preparing the resistant particles is as follows: In parts by mass, 1-3 parts of yttrium nitrate, 12-24 parts of aluminum chloride, 3-5 parts of potassium chloride, 8-10 parts of magnesium chloride, and 8-10 parts of zinc chloride are added to 300-400 parts of pure water, heated until dissolved, stirred for 8-9 minutes, 50-80 parts of boron nitride nanotubes and 20-36 parts of graphene are added, and stirring is continued for 15-18 minutes; under magnetic stirring, 80-100 parts of calcium hydroxide solution are added, and after the reaction is stable, the upper solution is discarded, leaving the precipitate; the precipitate is washed with pure water 2-3 times; Under vacuum, calcine the precipitate at 300-450°C for 80-90 min to obtain dried powder, continue to heat the powder to 1200-1300°C, calcine for 3-4 h, put the calcined powder into a ball mill, and ball mill for 7-8 h; The ball mill slurry was dried at 100-120°C, cooled to room temperature, and then γ-glycidyloxypropyltrimethoxysilane was added and stirred at 30-33°C for 20-26 minutes.

4. The method for improving the durability of silver ornaments according to claim 3, characterized in that: The magnetic stirring speed is 130-150 rpm.

5. The method for improving the durability of silver ornaments according to claim 3, characterized in that: The calcium hydroxide solution is a saturated solution.

6. The method for improving the durability of silver ornaments according to claim 3, characterized in that: The solvent used in the ball milling is ethanol.

7. The method for improving the durability of silver ornaments according to claim 3, characterized in that: The amount of the γ-glycidyloxypropyltrimethoxysilane used is 3-6% of the mass of the powder.

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