Method for testing the effective protection duration of a barrier material and use thereof

Abstract

The application belongs to the technical field of optical module manufacturing, and specifically provides an effective protection duration test method of barrier material, which comprises the following steps: S1, the barrier material is made into a container, the container is filled with a solute, and the container is sealed; S2, the initial mass of the container is weighed, and the container is placed in a set temperature for environmental aging experiment; S3, the mass of the container at different times is recorded, and the corresponding volatile mass is calculated; S4, according to the volatile mass and the surface area of the container, the change relationship of the volatile mass per unit area with time is obtained; S5, according to the preset failure concentration of the container and the surface area of the container, the failure volatile mass per unit area is calculated; S6, according to the change relationship of the volatile mass per unit area with time and the failure volatile mass per unit area, the effective protection duration of the barrier material is obtained. The method can accurately capture the slight penetration of the solute, avoid the harm caused by the large amount of volatilization of the solute, and save the amount of solute. The mold opening step is omitted, and the verification cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of optical module manufacturing technology, specifically relating to a method for testing the effective protection duration of barrier materials and its application. Background Technology

[0002] In recent years, with the rise of AI, data centers have also experienced rapid development. Traditional air cooling can no longer meet the ever-increasing heat dissipation requirements of servers, leading to the emergence of liquid-cooled data centers. Liquid cooling requires optical modules to be completely immersed in a heat-dissipating solute, which is liquid and often highly volatile. The light emitted by the laser inside the optical module propagates through the air and is then received. It is essential to isolate the optical path from the external heat-dissipating solute to prevent its evaporation and penetration, ensuring the normal operation of the optical module. Selecting a barrier material that can withstand and block the liquid heat-dissipating solute to seal the optical path of the optical module, preventing solute intrusion and module failure under immersion conditions, is a major challenge in the development of liquid-cooled data centers.

[0003] The protective effect of polymeric barrier materials against organic liquid cooling solutes involves two aspects: the reactivity between the two and the penetration and diffusion of organic solutes through the material itself. Solutes are typically inert solutions and do not react with most sealing materials. However, various sealing and barrier polymeric materials have gaps, making it impossible to eliminate the penetration and diffusion of organic solutes. The key to barrier material protection lies in minimizing the penetration and diffusion of organic solutes through the sealing material itself; currently, this can only be achieved by increasing the thickness. Therefore, the thickness of the polymeric material plays a crucial role in the sealing durability of optical modules. Furthermore, optical modules have fixed protocol dimensions and limited internal sealing space; therefore, determining the type and thickness of the sealing barrier material is a critical issue in liquid cooling.

[0004] Currently, the optical module industry primarily manufactures optical modules of varying thicknesses using mold making. These modules are then immersed in open solute tanks filled with liquid-cooled solute for extended periods to verify the sealing effectiveness of different thicknesses of sealing materials. The industry requires optical modules to operate stably for 5-10 years. Even with accelerated verification through temperature and pressure, assessing the durability of already sealed optical modules requires at least six months of immersion testing, resulting in significant solute consumption, large errors in weighing the immersed material, and difficulty in detecting trace permeation. Furthermore, a 50L open solute tank can hold approximately 40 optical module samples. While a larger opening facilitates sampling and testing, it also leads to substantial evaporation, reaching around 15L per week, causing environmental pollution and posing health risks to operators. Additionally, the mold making cost for a single solution is around 15,000 RMB, with the total cost proportional to the thickness gradient and material type. Moreover, the mold making cycle typically takes 2-4 weeks, resulting in high costs and low efficiency, failing to meet the demands of rapidly evolving data centers. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of high cost, long cycle and low accuracy in the existing technology of testing the effective protection time of barrier materials.

[0006] Therefore, the present invention provides a method for testing the effective protection time of barrier materials, comprising the following steps:

[0007] S1. Make a container from the barrier material, fill the container with the solute, and seal the container;

[0008] S2. Weigh the initial mass of the container and place the container at the set temperature for an environmental aging test.

[0009] S3. Record the container mass at different times and calculate the corresponding evaporation mass;

[0010] S4. Based on the volatile mass and the container surface area, obtain the relationship between the volatile mass per unit area and time.

[0011] S5. Calculate the mass of volatilization per unit area based on the preset container failure concentration and container surface area.

[0012] S6. Based on the relationship between the volatile mass per unit area and time and the volatile mass per unit area at failure, the effective protection time of the barrier material is obtained.

[0013] Specifically, for thermoplastic barrier materials, step S1 is as follows: 1. Make a mold with a preset thickness; 2. Place the mold on a heating table and adjust the temperature of the heating table to be higher than the melting point of the thermoplastic barrier material; 3. Add the thermoplastic barrier material to the mold until it melts and fills the entire mold; 4. Remove the mold and cool it to demold, obtaining a sheet material; 5. Assemble the sheet material into a container, and fuse the seams at high temperature before cooling and solidifying; 6. Inject the solute into the container using a syringe, fill the container, and seal the injection port.

[0014] Specifically, for thermosetting barrier materials, step S1 is as follows: make a mold with a preset thickness, put the thermosetting barrier material into the mold, scrape off the excess material that is higher than the mold, cure the material in the mold to obtain a sheet material; splice the sheet material into a container, and use the same material to splice the seams; inject the solute into the container with a syringe, fill the container, and seal the injection port.

[0015] Specifically, in step S1 above, light-curing adhesive is used to seal the injection port.

[0016] Specifically, in step S2 above, the container is placed at a constant temperature to conduct an accelerated environmental aging experiment.

[0017] Specifically, step S6 above involves: obtaining the protection duration of the barrier material at a constant temperature based on the relationship between the volatile mass per unit area and time and the volatile mass per unit area at failure; and calculating the actual effective protection duration of the barrier material at ambient temperature based on the temperature acceleration factor.

[0018] Specifically, the formula for calculating the temperature acceleration factor is lnAF = -Ea / RT; where AF is the temperature acceleration factor, Ea is the activation energy of the barrier material, R is the Boltzmann constant, and T is the ambient Kelvin temperature.

[0019] The method for testing the effective protection duration of barrier materials provided by this invention can be used in the fabrication of optical modules.

[0020] This invention also provides a method for screening optical module blocking materials, comprising the following steps:

[0021] S1. Prepare containers of different thicknesses from different types of barrier materials, fill each container with solute, and seal the container.

[0022] S2. Weigh the initial mass of the container and place the container at the set temperature for an environmental aging test.

[0023] S3. Record the container mass at different times and calculate the corresponding evaporation mass;

[0024] S4. Based on the volatile mass and container surface area, obtain the relationship between the volatile mass per unit area and time for different types and thicknesses of containers.

[0025] S5. Calculate the failure volatile mass per unit area of ​​the optical module housing based on the failure concentration and size of the optical module housing.

[0026] S6. Based on the relationship between the volatilization mass per unit area of ​​each container and the volatilization mass per unit area of ​​the optical module shell, the effective protection time of different thicknesses and types of barrier materials is obtained.

[0027] S7. Based on the required protection time of the optical module housing, select appropriate thickness and type of barrier material to prepare the optical module housing.

[0028] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0029] The effective protection duration testing method for barrier materials provided by this invention involves sealing the immersion solute in a container prepared from the barrier material, and using a precision electronic balance. The mass of the solute in a single sealed container does not exceed 100g, and the total volatilization during long-term immersion does not exceed 3g. This allows for precise capture of trace amounts of solute permeating through the sealed barrier material, avoiding environmental pollution and health hazards caused by large-scale solute volatilization, and saving solute usage and testing equipment resources. Furthermore, sheets of the same thickness can be used to quickly evaluate the sealing performance of barrier materials of different materials, providing a reference for liquid-cooled sealing. Simultaneously, it effectively transfers module-level evaluation to material-level evaluation, omitting module design and mold-making steps, saving verification time, and reducing verification costs.

[0030] The optical module barrier material screening method provided by this invention can measure the effective protection time of sealing barrier materials of different thicknesses in a short time, thereby obtaining the effective protection thickness of the optical module housing sealing barrier material. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Although representative embodiments of the present invention have been described in detail, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the embodiments, but should be defined by the appended claims and their equivalents.

[0032] This invention provides a method for testing the effective protection time of barrier materials, comprising the following steps:

[0033] S1. Make a container from the barrier material, fill the container with the solute, and seal the container.

[0034] For thermoplastic barrier materials, the container manufacturing process is as follows: A mold of a predetermined thickness is made; the mold is placed on a heating platform, and the temperature of the heating platform is adjusted to be higher than the melting point of the thermoplastic barrier material. The thermoplastic barrier material is added to the mold until it melts and fills the entire mold. After removing the mold, it is cooled and demolded to obtain sheet material; the sheet material is spliced ​​together to form a container, and the seams are fused at high temperature and then cooled and solidified; the solute is injected into the container using a syringe, and the container is filled and the injection port is sealed.

[0035] For thermosetting barrier materials, the container manufacturing process is as follows: a mold of a predetermined thickness is made, the thermosetting barrier material is placed in the mold, excess material protruding above the mold is scraped off, and the material inside the mold is cured to obtain sheet material; the sheet material is spliced ​​together to form a container, with the seams spliced ​​using the same type of material; the solute is injected into the container using a syringe, and the container is filled and the injection port is sealed.

[0036] It is preferable to use light-curing adhesive to seal the injection port.

[0037] The dimensions of a sealing container are determined by the hardness or softness of the barrier material: rigid materials are best made into cubes, but can also be made into equilateral tetrahedrons; soft materials, in addition to cubes and tetrahedrons, can also be made into cylinders or cones. When evaluating the sealing performance of the same material at different thicknesses, the thickness of the sealing container needs to be empirically determined and verified. The suitable thickness for polymer materials is usually between 0.8-5 mm.

[0038] When the optical module sealing material comes into contact with the immersion solute, the permeation is a liquid-polymer contact type of permeation, not the permeation of solute vapor. During the fabrication of the sealed container, it is necessary to completely fill the container with the solute, removing as much air as possible to ensure that the inner surface of the container is filled with liquid, thereby eliminating test errors caused by gas permeation through the interface.

[0039] In a more detailed embodiment, the method for manufacturing a mold with a preset thickness is as follows: a steel plate is used as a carrier substrate, and a plate frame of a specific size is formed on the carrier substrate using strip-shaped stainless steel sheets of a preset thickness. The connecting steel sheets of the frame are fixed with high-temperature resistant tape. A release agent is sprayed onto the carrier substrate and the strip-shaped stainless steel sheets to obtain a mold of the corresponding size.

[0040] By using the above method, it is possible to manufacture sealed containers of different thicknesses with specific materials simply by changing the thickness of the strip stainless steel sheet and the type of barrier material.

[0041] S2. Weigh the initial mass of the container and place it at the set temperature for an environmental aging test.

[0042] Since the permeation and volatilization experiment progresses slowly at ambient temperature, the container can be placed at a constant aging temperature for accelerated environmental aging experiments, thus shortening the experimental time. The constant aging temperature can be designed according to the aging test temperature required for the actual test material, generally selected as 75-90℃, with 85℃ being preferred.

[0043] S3. Record the container mass at different times and calculate the evaporation mass corresponding to each time.

[0044] S4. Based on the volatile mass and the container surface area, obtain the relationship between the volatile mass per unit area and time.

[0045] S5. Calculate the mass of volatiles per unit area based on the preset container failure concentration and container surface area.

[0046] The container failure concentration is the minimum amount of solute vapor that can cause the optical module to fail. Experimental tests have verified that the mass concentration of solute vapor in the optical module reaches 0.0001 mol / cm³. 3 At this point, the optical module fails. The mass of volatiles per unit area is obtained by dividing the failure concentration by the container surface area.

[0047] S6. Based on the relationship between the volatile mass per unit area and time and the volatile mass per unit area at failure, the effective protection time of the barrier material is obtained.

[0048] When high temperature is used for accelerated testing, the protection time of the barrier material under the aging temperature environment is obtained based on the relationship between the volatilization mass per unit area and time and the failure volatilization mass per unit area. Multiplying this time by the corresponding temperature acceleration factor, the actual effective protection time of the barrier material under the ambient temperature can be calculated.

[0049] The formula for calculating the temperature acceleration factor is lnAF = -Ea / RT; where AF is the temperature acceleration factor, Ea is the activation energy of the barrier material, R is the Boltzmann constant, and T is the ambient Kelvin temperature, which is generally 25℃, and T is taken as 298.15K.

[0050] This invention also provides a method for screening optical module blocking materials, comprising the following steps:

[0051] S1. Prepare containers of different thicknesses from different types of barrier materials, fill each container with solute, and seal the container.

[0052] The raw materials and thickness of the container are selected according to actual needs. When the barrier material is fixed, containers of different thicknesses can be made from the same type of barrier material to screen the thickness of the optical module barrier material; when the thickness is fixed, containers of the same thickness can be made from different types of barrier materials to screen the raw materials of the optical module barrier material.

[0053] S2. Weigh the initial mass of the container and place the container at the set temperature for an environmental aging test.

[0054] S3. Record the container mass at different times and calculate the corresponding evaporation mass;

[0055] S4. Based on the volatile mass and container surface area, obtain the relationship between the volatile mass per unit area and time for different types and thicknesses of containers.

[0056] S5. Calculate the failure volatile mass per unit area of ​​the optical module housing based on the failure concentration and size of the optical module housing.

[0057] S6. Based on the relationship between the volatilization mass per unit area of ​​each container and the volatilization mass per unit area of ​​the optical module shell, the effective protection time of different thicknesses and types of barrier materials is obtained.

[0058] S7. Based on the required protection time of the optical module housing, select appropriate thickness and type of barrier material to prepare the optical module housing.

[0059] Specifically, the effective protection time of barrier materials of different thicknesses and types was obtained using the aforementioned test method for the effective protection time of barrier materials.

[0060] Based on the relative protocol dimensions of the optical modules, the packaging dimensions of different types of optical modules are determined. The penetration surface area of ​​the barrier material is estimated and set according to the specific barrier scheme and module protocol dimensions. By matching the required protection time of the optical module with the effective protection time of barrier materials of different thicknesses, a barrier material of appropriate thickness is selected to prepare the optical module shell, ensuring that the protection time of the optical module meets the requirements.

[0061] The following specific embodiments illustrate the effective protection duration testing method of the barrier material of the present invention and its application effects.

[0062] Example 1:

[0063] This embodiment provides a method for testing the effective protection time of barrier materials of the same material (polyamide hot melt adhesive) with different thicknesses, including the following steps:

[0064] S1. Prepare a sealed container filled with solute.

[0065] A 5mm thick steel plate is selected as the carrier substrate, and a 12mm thick rectangular frame is formed using 1mm thick stainless steel strips. The frame is fixed to the carrier substrate with high-temperature tape. A release agent is sprayed onto the carrier substrate and the stainless steel strips to obtain a square mold with dimensions of 10mm*10mm*1mm. Since the melting temperature of polyamide hot melt adhesive is 160℃, the heating table temperature is set to 190℃, and the square mold is placed on the heating table. When the temperature reaches 190℃, hot melt adhesive granules are added to the square mold sequentially, taking care not to accumulate too many granules or add them too quickly to avoid exceeding the mold's capacity and causing excessive overflow that is difficult to clean. Once the mold is full, the excess adhesive is scraped off with a flat blade, and the entire mold is then transferred to a low-temperature location to cool. After complete cooling, the mold is demolded, and edge burrs are removed to obtain a 1mm thick sheet. Following this method, six hot melt adhesive sheets are made. The prepared hot melt adhesive sheets are cut into squares of the same size, and the side lengths of the squares are accurately measured. The cube is supported by splicing the six hot melt adhesive sheets in pairs. The seams are sealed with a high-temperature soldering iron. Note that the thickness of the seams needs to be greater than the set thickness of the individual sheets.

[0066] Following the steps above, hot melt adhesive sheets with thicknesses of 0.8mm, 1.0mm, and 1.2mm were made sequentially, and corresponding cubic containers were constructed. The actual side length of the cube was tested to be 10.85mm.

[0067] The cooled solute hexafluoropropylene trimer (molar mass of 450 g / mol) is injected sequentially into the prepared sealed container using a syringe, filling the container as much as possible and cleaning off any overflowing cooled solute. Then, the injection port is sealed with EMI 3408, a photothermal dual-curing adhesive with a high glass transition temperature, to obtain the test container.

[0068] S2. Weigh the initial mass of the container, place the container in a high-temperature aging chamber for baking, set the oven temperature to 85℃, and conduct a temperature-accelerated environmental aging experiment.

[0069] S3. Test the mass of the test container every 168 hours, record the mass of the container at different times, and calculate the evaporation mass (mass loss) corresponding to each time.

[0070] S4, Container surface area S = 1.085cm² * 1.085cm² * 6 = 7.06cm² 2 Based on the volatile mass and the container surface area, the relationship between the volatile mass per unit area and time was obtained, and the results are shown in Table 1-3.

[0071] Table 1. Variation of evaporation over time in containers made of 0.8mm thick polyamide hot melt adhesive.

[0072]

[0073] Table 2. Variation of evaporation over time for 1.0 mm thick polyamide hot melt adhesive containers.

[0074]

[0075] Table 3. Variation of evaporation over time in containers made of 1.2 mm thick polyamide hot melt adhesive.

[0076]

[0077] S5. Based on actual testing, the failure concentration of the module is set to 0.00001 mol / cm³. 3 Taking the current solution as an example, the area of ​​the device that needs to be sealed is calculated according to the dimensions specified in the industry standard protocol of the module, and the permeable surface area is 1.5 cm². 2 ;

[0078] Based on the existing plan, the actual area of ​​the device that needs to be sealed is approximately 1 cm long, 1.2 cm wide, and 0.2 cm thick; the total sealing area is approximately but does not exceed S (cavity) = 0.2 cm * 1 cm * 1.2 cm = 0.24 cm. 3 .

[0079] At 85℃, the failure volatile amount per unit area of ​​the module is M = 0.00001 mol / cm³. 3 *0.24cm 3 *450g / mol=0.00108g.

[0080] The mass of volatile material released per unit area is M' = 0.0108 g / 1.5 cm². 2 =0.00072g / cm 2 .

[0081] The protective duration of polyamide hot melt adhesive materials of various thicknesses was obtained through actual testing, and the closest value, less than 0.00072 g / cm³, was selected from Tables 1-3. 2 The cumulative mass loss per unit area should be calculated based on the immersion time, and the expected effective protection time of the polyamide hot melt adhesive material at various thicknesses is obtained. The results are shown in Table 4.

[0082] Table 4 Effective protection time of polyamide hot melt adhesive materials of various thicknesses

[0083]

[0084] Although the effective protection time obtained by testing and calculating according to the method of the present invention differs from the effective protection time obtained by actual testing, the results are relatively close and can be used as a valid reference in the optical module manufacturing process.

[0085] The required lifespan of optical modules under ambient temperature is at least 5-10 years. Based on the temperature acceleration factor calculation formula lnAF = -Ea / RT, it is estimated that the reaction rate doubles for every 10°C increase in temperature. The actual application temperature of optical modules is generally calculated at 35°C; at 85°C, the acceleration factor AF = 32.

[0086] When the required protection duration is 5 years, the required protection duration at 85℃ is: T(85℃) = 5 × 365 × 24 / 32 = 1368.75 H; when the required protection duration is 10 years, the required protection duration at 85℃ is: T(85℃) = 10 × 365 × 24 / 32 = 2737.5 H.

[0087] Based on the required protection time at 85℃ and the effective protection time of polyamide hot melt adhesive materials of different thicknesses in Table 4, select a material of appropriate thickness to manufacture the module. For a protection time of 5 years, a thickness of 1.15mm (840<1368.75<1680) is selected, and for 10 years, a thickness of 1.26mm (1680<2737.5<3024) is selected.

[0088] Example 2:

[0089] This embodiment provides a method for testing the effective protection time of three barrier materials of the same thickness but different materials, including the following steps:

[0090] S1. Prepare a sealed container filled with solute.

[0091] A 5mm thick steel plate is selected as the carrier substrate, and a 1mm thick strip of stainless steel is used to form a square frame with an outer side length of 12mm. The square frame is fixed to the carrier substrate with high-temperature resistant tape. A release agent is sprayed on the carrier substrate and the strip of stainless steel to obtain a square mold with dimensions of 10mm*10mm*1mm.

[0092] To make an epoxy potting compound container: Pour epoxy potting compound into a square mold, using a scraper to pull it from one side to the other, filling the entire mold while removing excess compound. Place the square mold in a 100℃ oven for curing for 1 hour, then remove and let cool before demolding. Trim the edges with a cutter to obtain a square epoxy potting compound sheet with sides of 12mm and a thickness of 1mm. Make 6 sheets in total, or make one large sheet and cut it into 6 smaller squares of the same size. Sew the sheets together in pairs to form the epoxy potting compound sealing container, using adhesive to bond the seams. Note that the thickness of the seams must be greater than 1mm. Once assembled, the epoxy potting compound container is complete.

[0093] To make a polyamide hot melt adhesive container: Place a square mold on a heating table. When the temperature reaches 190℃, add hot melt adhesive granules one by one into the square mold. Be careful not to pile up too many granules, and do not add them too quickly to avoid exceeding the mold's capacity and causing excessive overflow that is difficult to clean. Once the mold is full, scrape off any excess adhesive with a flat blade, then transfer the entire mold to a low-temperature location to cool. After complete cooling, demold the mold, remove any burrs from the edges, and you will obtain a 1mm thick sheet. Following the above procedure, make 6 hot melt adhesive sheets. Cut the prepared hot melt adhesive sheets into squares of the same size, and accurately measure the side length of each square. Join the 6 hot melt adhesive sheets in pairs to support a cube, sealing the seams with a high-temperature soldering iron. Note that the thickness of the seam needs to be greater than the set thickness of a single sheet. Once assembled, you will have a polyamide hot melt adhesive container.

[0094] Manufacturing silicone sealant containers: The manufacturing method is similar to that of epoxy potting compound containers, except that high-temperature baking and curing is replaced with room temperature curing for 24 hours.

[0095] The cooled solute hexafluoropropylene trimer (molar mass of 450 g / mol) was injected sequentially into the three prepared sealed containers using a syringe, filling the containers as much as possible and cleaning off any overflowing cooled solute. Then, the injection port was sealed with EMI 3408, a photothermal dual-curing adhesive with a high glass transition temperature, to obtain the test container.

[0096] S2. Weigh the initial mass of the container, place the container in a high-temperature aging chamber for baking, set the oven temperature to 85℃, and conduct a temperature-accelerated environmental aging experiment.

[0097] S3. Test the mass of the test container every 168 hours, record the mass of the container at different times, and calculate the evaporation mass (mass loss) corresponding to each time.

[0098] S4, Container surface area S = 1.085cm² * 1.085cm² * 6 = 7.06cm² 2 Based on the volatile mass and the container surface area, the relationship between the volatile mass per unit area and time was obtained, and the results are shown in Table 5-7.

[0099] Table 5. Variation of volatile matter content over time in a 1.0 mm thick epoxy potting compound container.

[0100]

[0101] Table 6. Variation of volatile matter over time in containers made of 1.0 mm thick polyamide hot melt adhesive.

[0102]

[0103] Table 7. Variation of evaporation over time for 1.0 mm thick silicone sealant containers.

[0104]

[0105] S5. Based on actual testing, the failure concentration of the module is set to 0.00001 mol / cm³. 3 Taking the current solution as an example, the area of ​​the device that needs to be sealed is calculated according to the dimensions specified in the industry standard protocol of the module, and the permeable surface area is 1.5 cm². 2 ;

[0106] Based on the existing plan, the actual area of ​​the device that needs to be sealed is approximately 1 cm long, 1.2 cm wide, and 0.2 cm thick; the total sealing area is approximately but does not exceed S (cavity) = 0.2 cm * 1 cm * 1.2 cm = 0.24 cm. 3 .

[0107] At 85℃, the failure volatile amount per unit area of ​​the module is M = 0.00001 mol / cm³. 3 *0.24cm 3 *450g / mol=0.00108g.

[0108] The mass of volatile material released per unit area is M' = 0.0108 g / 1.5 cm². 2 =0.00072g / cm 2 .

[0109] The protection duration of various materials was obtained through actual testing, and the closest value, less than 0.00072 g / cm³, was selected from Table 5-7. 2 The cumulative mass loss per unit area should be calculated based on the immersion time, and the expected effective protection time of barrier materials of the same thickness but different materials is obtained. The results are shown in Table 8.

[0110] Table 8 Effective protection duration of each material

[0111]

[0112] The effective protection time obtained by testing epoxy potting compounds and polyamide hot melt adhesives using the method described in this invention is close to the effective protection time obtained by actual product testing, proving the effectiveness of the method. However, the effective protection time obtained by testing silicone sealants using the method described in this invention differs significantly from the effective protection time obtained by actual product testing, suggesting that air bubbles may have been introduced during sample preparation, leading to inaccurate test results. After testing, the silicone sealant film was removed and X-ray scanned. The spectrum showed that air bubbles were indeed present in the silicone sealant sample, confirming the air bubble hypothesis.

[0113] The required lifespan of optical modules under ambient temperature is at least 5-10 years. Based on the temperature acceleration factor calculation formula lnAF = -Ea / RT, it is estimated that the reaction rate doubles for every 10°C increase in temperature. The actual application temperature of optical modules is generally calculated at 35°C; at 85°C, the acceleration factor AF = 32.

[0114] When the required protection duration is 5 years, the required protection duration at 85℃ is: T(85℃) = 5 × 365 × 24 / 32 = 1368.75 H; when the required protection duration is 10 years, the required protection duration at 85℃ is: T(85℃) = 10 × 365 × 24 / 32 = 2737.5 H.

[0115] Based on the required protection time at 85℃ and the effective protection time of different materials in Table 8, select appropriate barrier materials to make modules. For a protection time of 5 years, use polyamide hot melt adhesive (504<1368.75<1848); for 10 years, use 1.26mm (1848<2737.5<3360).

[0116] The above examples are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A method for testing the effective protection time of an optical module blocking material, characterized in that, Includes the following steps: S1. Make a container from the barrier material, fill the container with the cooled solute, and seal the container; S2. Weigh the initial mass of the container and place the container at the set temperature for an environmental aging test. S3. Record the container mass at different times and calculate the corresponding evaporation mass; S4. Based on the volatile mass and the container surface area, obtain the relationship between the volatile mass per unit area and time. S5. Obtain the failure volatilization mass based on the preset failure concentration and volume of the device sealing area, and calculate the failure volatilization mass per unit area based on the failure volatilization mass and the surface area of ​​the device sealing area. S6. Based on the relationship between the volatile mass per unit area and time, select the time corresponding to the volatile mass per unit area that is closest to and less than the failure volatile mass per unit area to obtain the effective protection duration of the barrier material.

2. The method for testing the effective protection time of the optical module blocking material as described in claim 1, characterized in that, For thermoplastic barrier materials, step S1 specifically involves: making a mold with a preset thickness; placing the mold on a heating table, adjusting the temperature of the heating table to be higher than the melting point of the thermoplastic barrier material, adding the thermoplastic barrier material into the mold until the thermoplastic barrier material melts and fills the entire mold, removing the mold and cooling it to obtain a sheet material; splicing the sheet material into a container, fusing the seams at high temperature and then cooling and solidifying them; injecting the cooled solute into the container with a syringe, filling the container, and sealing the injection port.

3. The method for testing the effective protection time of the optical module blocking material as described in claim 1, characterized in that, For thermosetting barrier materials, step S1 specifically involves: making a mold with a preset thickness, placing the thermosetting barrier material into the mold, scraping off the excess material above the mold, curing the material inside the mold to obtain sheet material; splicing the sheet material into a container, with the seams spliced ​​using the same material; injecting the cooled solute into the container using a syringe, filling the container, and sealing the injection port.

4. The method for testing the effective protection duration of the optical module blocking material as described in any one of claims 2 or 3, characterized in that: The injection port is sealed with UV-curable adhesive.

5. The method for testing the effective protection time of the optical module blocking material as described in claim 1, characterized in that: In step S2, the container is placed at a constant aging temperature for accelerated environmental aging experiments.

6. The method for testing the effective protection time of the optical module blocking material as described in claim 5, characterized in that, Specifically, step S6 involves: based on the relationship between the volatile mass per unit area and time, selecting the time corresponding to the volatile mass per unit area that is closest to and less than the volatile mass per unit area failure, and obtaining the protection duration of the barrier material at a constant aging temperature; and calculating the actual effective protection duration of the barrier material at ambient temperature based on the temperature acceleration factor.

7. The method for testing the effective protection time of the optical module blocking material as described in claim 6, characterized in that: The formula for calculating the temperature acceleration factor is lnAF = -Ea / RT; where AF is the temperature acceleration factor, Ea is the activation energy of the barrier material, R is the Boltzmann constant, and T is the ambient Kelvin temperature.

8. A method for screening optical module blocking materials, characterized in that, Includes the following steps: S1. Prepare containers of different thicknesses from different types of barrier materials, fill each container with cooled solute, and seal the container. S2. Weigh the initial mass of the container and place the container at the set temperature for an environmental aging test. S3. Record the container mass at different times and calculate the corresponding evaporation mass; S4. Based on the volatile mass and container surface area, obtain the relationship between the volatile mass per unit area and time for different types and thicknesses of containers. S5. Obtain the failure volatilization mass based on the preset failure concentration and volume of the device sealing area, and calculate the failure volatilization mass per unit area based on the failure volatilization mass and the surface area of ​​the device sealing area. S6. Based on the relationship between the volatilization mass per unit area of ​​each container and time, select the time corresponding to the volatilization mass per unit area that is closest to and less than the failure volatilization mass per unit area to obtain the effective protection duration of barrier materials of different thicknesses and types. S7. Based on the required protection time of the device's sealing area, select a suitable thickness and type of barrier material to prepare the device's sealing area.

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