A process for stripping germanium-coated lenses

Abstract

The present invention provides a process for de-filming germanium-coated lenses, comprising the following steps: A) washing the lens with water to obtain a pre-treated lens; B) soaking the pre-treated lens in an ammonium bifluoride solution to obtain an ammonium bifluoride-soaked lens; C) soaking the soaked lens in a hydrochloric acid solution to obtain a hydrochloric acid-soaked lens; D) washing the hydrochloric acid-soaked lens, taking it out, and drying it. The present invention de-films discarded coated lenses through the above-mentioned treatment process, saving lens processing costs and avoiding damage to the germanium itself; at the same time, the de-filmed lenses within the size are returned to the previous process for processing, and the other returned single crystal lenses are returned to the furnace for refining in the workshop, which can effectively reduce the cost of germanium materials and greatly save processing time. The process of the present invention has a high yield rate and little film residue.

Description

Technical Field

[0001] The present invention relates to the technical field of optical processing, and in particular to a film removal process for germanium-coated lenses. Background Art

[0002] Germanium metal is a rare and precious metal. With its widespread application, its unit price has now exceeded that of silver. The unit price of coated germanium lenses formed after intensive processing will increase by more than three times. Coated germanium lenses are affected by the external environment after long-term use and need to be replaced after a few years depending on the quality of the coating. At the same time, due to the influence of many uncontrollable factors during the coating process, batches of poorly coated germanium lenses will appear after coating. Therefore, the repair and recycling of germanium lenses are particularly important in all walks of life.

[0003] Germanium-coated lenses can also be used on infrared lenses. When lens coatings fail, the traditional treatment method is to sandblast the unqualified products, which wastes material and time costs.

[0004] Therefore, it is very necessary to provide a process method to strip the coating of unqualified germanium lenses. The lenses that are within the size can be returned to the previous process for processing, and the other returned single crystals can be returned to the single crystal workshop for refining. This can effectively reduce the cost of germanium materials and greatly save processing time. Summary of the Invention

[0005] In view of this, the present invention provides a germanium-coated lens de-filming process. The process of the present invention can de-film scrapped coated lenses, saving lens processing costs, with high yield and less film residue.

[0006] The present invention provides a process for stripping a germanium-coated lens, comprising the following steps:

[0007] A) heating and cleaning the lens with water to obtain a pretreated lens;

[0008] B) soaking the pretreated lens in an ammonium bifluoride solution to obtain an ammonium bifluoride-soaked lens;

[0009] C) soaking the soaked lens in a hydrochloric acid solution to obtain a hydrochloric acid-soaked lens;

[0010] D) After washing the lens soaked in hydrochloric acid, take it out and dry it.

[0011] Preferably, in step A), the water is heated at a temperature of 60-70° C. for 10-15 minutes.

[0012] Preferably, the concentration of the ammonium bifluoride solution in step B) is 1.2 wt% to 1.5 wt%.

[0013] Preferably, the immersion temperature of the ammonium bifluoride solution is 70-80° C., and the immersion time is 10-15 minutes.

[0014] Preferably, in step C), the concentration of the hydrochloric acid solution is 1.0 mol / L; the soaking temperature is 90-100° C.; and the soaking time is 1.5-2 h.

[0015] Preferably, in step D), the cleaning is performed by using water to clean the hydrochloric acid and film residues on the lens surface.

[0016] Preferably, the removing in step D) specifically includes: removing and observing whether the film layer is completely removed. If there are lenses that are not completely removed, the process will be returned to step A) to perform the film removal process again.

[0017] Preferably, the drying in step D) is specifically performed by baking at 90-95° C. for 1-2 hours.

[0018] The present invention provides a germanium-coated lens, and uses the film stripping process described in the above technical solution to process lenses with unqualified coating.

[0019] Compared with the prior art, the present invention provides a de-filming process for germanium-coated lenses, comprising the following steps: A) washing the lens with water to obtain a pre-treated lens; B) soaking the pre-treated lens in an ammonium bifluoride solution to obtain an ammonium bifluoride-soaked lens; C) soaking the soaked lens in a hydrochloric acid solution to obtain a hydrochloric acid-soaked lens; D) washing the hydrochloric acid-soaked lens, taking it out, and drying it. The present invention de-films discarded coated lenses through the above-mentioned treatment process, saving the processing cost of the lenses and avoiding damage to the germanium itself; at the same time, the de-filmed lenses within the size are returned to the previous process for processing, and the other returned single crystal lenses are returned to the furnace for refining in the workshop, which can effectively reduce the cost of germanium materials and greatly save processing time. The process of the present invention has a high yield rate and little film residue. DETAILED DESCRIPTION

[0020] The present invention provides a process for de-coating germanium-coated lenses. Those skilled in the art can draw upon the disclosure herein and appropriately modify the process parameters to achieve this goal. It is particularly important to note that all similar substitutions and modifications will be readily apparent to those skilled in the art and fall within the scope of protection of the present invention. The methods and applications of the present invention have been described through preferred embodiments. It is readily apparent that those skilled in the art will be able to modify, alter, and combine the methods and applications herein to implement and apply the technology of the present invention without departing from the content, spirit, and scope of the present invention.

[0021] The present invention provides a process for stripping a germanium-coated lens, comprising the following steps:

[0022] A) heating and cleaning the lens with water to obtain a pretreated lens;

[0023] B) soaking the pretreated lens in an ammonium bifluoride solution to obtain an ammonium bifluoride-soaked lens;

[0024] C) soaking the soaked lens in a hydrochloric acid solution to obtain a hydrochloric acid-soaked lens;

[0025] D) After washing the lens soaked in hydrochloric acid, take it out and dry it.

[0026] The germanium-coated lens de-filming process provided by the present invention firstly cleans the lens by heating it with water to obtain a pre-treated lens.

[0027] The lens here refers to a germanium lens with unqualified coating, and the present inventor does not limit this, and it is well known to those skilled in the art.

[0028] The water heating temperature of the present invention is preferably 60-70° C.; more preferably 62-68° C.; the heating time is preferably 10-15 min; more preferably 11-14 min.

[0029] In one preferred embodiment of the present invention, a container containing 10L of pure water is heated to 60-70°C, the lenses to be de-filmed are placed in a cleaning basket in order, and then the cleaning basket is placed in the container and boiled for 10-15 minutes.

[0030] This step is to clean the dirt on the lens.

[0031] The pretreated lens is soaked in an ammonium bifluoride solution to obtain an ammonium bifluoride soaked lens.

[0032] The concentration of the ammonium bifluoride solution of the present invention is preferably 1.2wt% to 1.5wt%; more preferably 1.2wt% to 1.4wt%; the immersion temperature of the ammonium bifluoride solution is 70 to 80°C; more preferably 72 to 78°C; and the immersion time is preferably 11 to 14 minutes.

[0033] The preparation method of the ammonium bifluoride solution of the present invention is preferably as follows: prepare a container and put 10L of pure water, add 120-150g of ammonium bifluoride and stir evenly to form a solution, and then filter it once with a homemade filter after stirring evenly. The homemade filter of the present invention is a 300 mesh gauze.

[0034] In some preferred embodiments of the present invention, a container containing ammonium bifluoride is heated, and lenses that have been boiled in pure water are placed in the container and heated and soaked. This step serves to loosen the film layer.

[0035] The soaked lens is soaked in a hydrochloric acid solution to obtain a hydrochloric acid soaked lens.

[0036] The concentration of the hydrochloric acid solution of the present invention is 1.0 mol / L; the soaking temperature is preferably 90-100° C., more preferably 92-98° C.; the soaking time is preferably 1.5-2 h, more preferably 2 h.

[0037] In some preferred embodiments of the present invention, a third container is prepared, 5 L of standard hydrochloric acid solution is added, and heated to 90-100 degrees Celsius. The lenses cooked in the second container are placed in this container and soaked for 2 hours.

[0038] After cleaning the lens soaked in hydrochloric acid, take it out and dry it.

[0039] The cleaning method of the present invention is to use water to clean the hydrochloric acid and film residues on the surface of the lens.

[0040] That is: put the soaked lens into clean pure water and clean it to remove the hydrochloric acid and film residue on the lens surface.

[0041] The removing of the lens in the present invention is specifically as follows: taking out and observing whether the film layer is removed completely. If there are lenses that are not removed completely, the process will be returned to step A) to perform the film removal process again.

[0042] The drying method of the present invention specifically includes: transferring the spin-dried lenses to a dedicated drying machine that can ensure cleanliness, arranging them in an orderly manner, closing the drying machine door, setting the drying machine temperature to 90-95°C and baking for 1-2 hours to remove surface moisture. More preferably, the drying method specifically includes baking at 95°C for 2 hours.

[0043] The lenses that have been cleaned and tested to be within the size range will be returned to the previous process for reprocessing, otherwise they will be returned to the single crystal workshop for remelting.

[0044] The present invention provides a germanium-coated lens, and uses the film stripping process described in the above technical solution to process lenses with unqualified coating.

[0045] The present invention provides a process for de-filming germanium-coated lenses, comprising the following steps: A) washing the lens with water to obtain a pre-treated lens; B) soaking the pre-treated lens in an ammonium bifluoride solution to obtain an ammonium bifluoride-soaked lens; C) soaking the soaked lens in a hydrochloric acid solution to obtain a hydrochloric acid-soaked lens; D) washing the hydrochloric acid-soaked lens, taking it out, and drying it. The present invention de-films discarded coated lenses through the above-mentioned treatment process, saving lens processing costs and avoiding damage to the germanium itself; at the same time, the de-filmed lenses within the size are returned to the previous process for processing, and the other returned single crystal lenses are returned to the furnace for refining in the workshop, which can effectively reduce the cost of germanium materials and greatly save processing time. The process of the present invention has a high yield rate and little film residue.

[0046] In order to further illustrate the present invention, a film stripping process for a germanium-coated lens provided by the present invention is described in detail below with reference to examples.

[0047] Example 1

[0048] Prepare a container with 10L of pure water, heat it to 60 degrees Celsius, put the lenses that need to be stripped into the cleaning basket in order, and then put the cleaning basket into the container and boil it for 15 minutes. This step is to clean the dirt on the lens.

[0049] Prepare another container and put in 10L of pure water, add 120 grams of ammonium bifluoride and stir evenly to form a solution. After stirring evenly, filter it once with a homemade filter.

[0050] Heat the container containing ammonium bifluoride to 80 degrees Celsius, put the lens boiled in pure water into the container, and heat and soak for 10 minutes. This step is to loosen the film layer.

[0051] Prepare a third container, add 5L of hydrochloric acid standard solution, heat it to 90 degrees Celsius, put the lens cooked in the second container into this container, and soak for about 2 hours.

[0052] Place the soaked lens in clean pure water and clean it to remove the hydrochloric acid and film residue on the lens surface.

[0053] Take out the washed lenses and check whether the film has been removed cleanly. If there are lenses that have not been removed cleanly, pick out these lenses and remove the film together with the next batch of lenses.

[0054] Drying: After drying, transfer the lenses to a dedicated drying machine that can ensure cleanliness and arrange them in an orderly manner. Close the drying machine door, set the drying machine temperature to 95℃ and bake for 2 hours to remove surface moisture.

[0055] The lenses that have been cleaned and tested to be within the size range will be returned to the previous process for reprocessing, otherwise they will be returned to the single crystal workshop for remelting.

[0056] The film stripping yield rate of Example 1 of the present invention is 100%.

[0057] Example 2

[0058] Prepare a container with 10L of pure water, heat it to 65 degrees Celsius, put the lenses that need to be stripped into the cleaning basket in order, and then put the cleaning basket into the container and boil it for 10min-15min. This step is to clean the dirt on the lens.

[0059] Prepare another container and put in 10L of pure water, add 130 grams of ammonium bifluoride and stir evenly to form a solution. After stirring evenly, filter it once with a homemade filter.

[0060] Heat the container containing ammonium bifluoride to 75 degrees Celsius, put the lens boiled in pure water into the container, and heat and soak for 12 minutes. This step is to loosen the film layer.

[0061] Prepare a third container, add 5L of hydrochloric acid standard solution, heat it to 95 degrees Celsius, put the lens cooked in the second container into this container, and soak for about 2 hours.

[0062] Place the soaked lens in clean pure water and clean it to remove the hydrochloric acid and film residue on the lens surface.

[0063] Take out the washed lenses and check whether the film has been removed cleanly. If there are lenses that have not been removed cleanly, pick out these lenses and remove the film together with the next batch of lenses.

[0064] Drying: After drying, transfer the lenses to a dedicated drying machine that can ensure cleanliness and arrange them in an orderly manner. Close the drying machine door, set the drying machine temperature to 95℃ and bake for 2 hours to remove surface moisture.

[0065] The lenses that have been cleaned and tested to be within the size range will be returned to the previous process for reprocessing, otherwise they will be returned to the single crystal workshop for remelting.

[0066] The film removal yield of Example 2 of the present invention is 100%.

[0067] Example 3

[0068] Prepare a container with 10L of pure water, heat it to 70 degrees Celsius, put the lenses that need to be stripped into the cleaning basket in order, and then put the cleaning basket into the container and boil it for 10min-15min. This step is to clean the dirt on the lens.

[0069] Prepare another container and put in 10L of pure water, add 150 grams of ammonium bifluoride and stir evenly to form a solution. After stirring evenly, filter it once with a homemade filter.

[0070] Heat the container containing ammonium bifluoride to 70 degrees Celsius, put the lens boiled in pure water into the container, and heat and soak for 15 minutes. This step is to loosen the film layer.

[0071] Prepare a third container, add 5L of hydrochloric acid standard solution, heat it to 100 degrees Celsius, put the lens cooked in the second container into this container, and soak for about 2 hours.

[0072] Place the soaked lens in clean pure water and clean it to remove the hydrochloric acid and film residue on the lens surface.

[0073] Take out the washed lenses and check whether the film has been removed cleanly. If there are lenses that have not been removed cleanly, pick out these lenses and remove the film together with the next batch of lenses.

[0074] Drying: After drying, transfer the lenses to a dedicated drying machine that can ensure cleanliness and arrange them in an orderly manner. Close the drying machine door, set the drying machine temperature to 95℃ and bake for 2 hours to remove surface moisture.

[0075] The lenses that have been cleaned and tested to be within the size range will be returned to the previous process for reprocessing, otherwise they will be returned to the single crystal workshop for remelting.

[0076] The film stripping yield of Example 3 of the present invention is 100%.

[0077] Comparative Example 1

[0078] 1. Prepare a container with 10L of pure water, heat it to 60 degrees Celsius, put the lenses that need to be stripped into the cleaning basket in order, and then put the cleaning basket into the container and boil it for 15 minutes. This step is to clean the dirt on the lens.

[0079] 4. Prepare a third container and add 5L of hydrochloric acid standard solution, heat it to 90 degrees Celsius, put the lens cooked in the second container into this container, and soak for about 2 hours.

[0080] 5. Place the soaked lens in clean pure water and clean it to remove the hydrochloric acid and film residue on the lens surface.

[0081] 6. Take out the washed lenses and observe whether the film has been removed cleanly. If there are lenses that have not been removed cleanly, pick out these lenses and remove the film together with the next batch of lenses.

[0082] 7. Drying: After drying, transfer the lenses to a dedicated drying machine that can ensure cleanliness and arrange them in an orderly manner. Close the drying machine door, set the drying machine temperature to 95℃ and bake for 2 hours to remove surface moisture.

[0083] 8. The cleaned lenses that are tested and within the size range will be returned to the previous process for reprocessing, otherwise they will be returned to the single crystal workshop for remelting.

[0084] In the case where the second and third steps are missing from Comparative Example 1 relative to Example 1, the yield rate drops to 90%.

[0085] Comparative Example 2

[0086] 1. Prepare a container with 10L of pure water, heat it to 65 degrees Celsius, put the lenses that need to be stripped into the cleaning basket in order, and then put the cleaning basket into the container and boil it for 10min-15min. This step is to clean the dirt on the lens.

[0087] 2. Prepare another container and put in 10L of pure water, add 130g of ammonium bifluoride and stir evenly to form a solution. After stirring evenly, filter it with a homemade filter.

[0088] 3. Heat the container containing ammonium bifluoride to 75 degrees Celsius, place the lens boiled in pure water into the container, and heat and soak for 12 minutes. This step is to loosen the film layer.

[0089] 5. Place the soaked lens in clean pure water and clean it to remove the hydrochloric acid and film residue on the lens surface.

[0090] 6. Take out the washed lenses and observe whether the film has been removed cleanly. If there are lenses that have not been removed cleanly, pick out these lenses and remove the film together with the next batch of lenses.

[0091] 7. Drying: After drying, transfer the lenses to a dedicated drying machine that can ensure cleanliness and arrange them in an orderly manner. Close the drying machine door, set the drying machine temperature to 95℃ and bake for 2 hours to remove surface moisture.

[0092] 8. The cleaned lenses that are tested and within the size range will be returned to the previous process for reprocessing, otherwise they will be returned to the single crystal workshop for remelting.

[0093] In Comparative Example 2, in which the fourth step is omitted relative to Example 1, the yield drops to 20%.

[0094] Comparative Example 3

[0095] 1. Prepare a container with 10L of pure water, heat it to 70 degrees Celsius, put the lenses that need to be stripped into the cleaning basket in order, and then put the cleaning basket into the container and boil it for 10min-15min. This step is to clean the dirt on the lens.

[0096] 2. Prepare another container and put in 10L of pure water, add 100g of ammonium bifluoride and stir evenly to form a solution. After stirring evenly, filter it with a homemade filter.

[0097] 3. Heat the container containing ammonium bifluoride to 50 degrees Celsius, put the lens boiled in pure water into the container, and heat and soak it for 10 minutes. This step is to loosen the film layer.

[0098] 4. Prepare a third container and add 5L of hydrochloric acid standard solution, heat it to 80 degrees Celsius, put the lens cooked in the second container into this container, and soak it for about 1 hour.

[0099] 5. Place the soaked lens in clean pure water and clean it to remove the hydrochloric acid and film residue on the lens surface.

[0100] 6. Take out the washed lenses and observe whether the film has been removed cleanly. If there are lenses that have not been removed cleanly, pick out these lenses and remove the film together with the next batch of lenses.

[0101] 7. Drying: After drying, transfer the lenses to a dedicated drying machine that can ensure cleanliness and arrange them in an orderly manner. Close the drying machine door, set the drying machine temperature to 95℃ and bake for 2 hours to remove surface moisture.

[0102] 8. The cleaned lenses that are tested and within the size range will be returned to the previous process for reprocessing, otherwise they will be returned to the single crystal workshop for remelting.

[0103] In comparative example 3, the yield rate dropped to 80%.

[0104] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A process for stripping a germanium-coated lens, characterized in that: The steps include: A) heating the lens with water to clean it to obtain a pretreated lens; the water is heated to a temperature of 60 to 70° C. for 10 to 15 minutes; B) soaking the pretreated lens in an ammonium bifluoride solution to obtain an ammonium bifluoride-soaked lens; the concentration of the ammonium bifluoride solution is 1.2 wt% to 1.5 wt%; The immersion temperature of the ammonium bifluoride solution is 70-80°C; the immersion time is 10-15 minutes; C) soaking the soaked lens in a hydrochloric acid solution to obtain a hydrochloric acid-soaked lens; the concentration of the hydrochloric acid solution is 1.0 mol / L; the soaking temperature is 90 to 100° C.; and the soaking time is 1.5 to 2 hours; D) cleaning the lens after soaking in hydrochloric acid, taking it out, and drying it. The drying step specifically includes baking it at 90-95° C. for 1-2 hours.

2. The process according to claim 1, characterized in that In step D), the cleaning step is to use water to clean the hydrochloric acid and film residues on the lens surface.

3. The process according to claim 1, characterized in that The specific process of removing the lens in step D) is as follows: removing the lens and observing whether the film layer is completely removed. If there are lenses that are not completely removed, the process returns to step A) to perform the film removal process.

4. A germanium-coated lens, characterized in that: The process described in any one of claims 1 to 3 is used to treat lenses with unqualified coatings.