Two-component potting adhesive, its preparation method, and photovoltaic module

Abstract

The present application relates to a two-component potting adhesive, a preparation method thereof, and a photovoltaic module. The two-component potting adhesive comprises component A and component B capable of curing component A; by mass parts, component A comprises the following components: 42-60 parts of hydroxyl-terminated polydimethylsiloxane, 40-50 parts of aluminum hydroxide, and 2-9 parts of surfactant-modified molybdenum disulfide flakes; the mass proportion of the surfactant-modified molybdenum disulfide flakes in component A is 3%-7%. By combining the surfactant-modified molybdenum disulfide flakes with aluminum hydroxide and acting with hydroxyl-terminated polydimethylsiloxane, and controlling specific proportions among the components, the salt spray resistance of the two-component potting adhesive can be effectively improved on the basis of ensuring that the curing hardness and tensile strength are basically not affected.

Description

Technical Field

[0001] The present application relates to the technical field of materials, and particularly to a two-component potting adhesive, a preparation method thereof, and a photovoltaic module. Background Art

[0002] In recent years, offshore photovoltaics have received extensive attention due to the advantages of not occupying land resources, having high power generation and high added value. However, offshore photovoltaic projects also face many difficulties and challenges in the actual application process. For example, there are a large number of corrosive ions in marine salt spray and seawater, such as chloride ions, sodium ions, etc. If these corrosive ions enter the diode area of the component junction box, they will seriously corrode the diode, causing the diode to fail and thus affecting the normal use of the component. Summary of the Invention

[0003] Based on this, the present application provides a two-component potting adhesive with good salt spray resistance, a preparation method thereof, and a photovoltaic module.

[0004] The technical solutions of the present application for solving the above technical problems are as follows.

[0005] In the first aspect of the present application, a two-component potting adhesive is provided, which includes component A and component B that can cure component A; by mass, component A includes the following components: 42-60 parts of hydroxyl-terminated polydimethylsiloxane, 40-50 parts of aluminum hydroxide, and 2-9 parts of surfactant-modified molybdenum disulfide flakes; the mass ratio of the surfactant-modified molybdenum disulfide flakes in component A is 3%-7%.

[0006] In some embodiments, in the two-component potting adhesive, by mass, component A includes the following components:

[0007] 48-52 parts of hydroxyl-terminated polydimethylsiloxane, 42-48 parts of aluminum hydroxide, and 3-7 parts of surfactant-modified molybdenum disulfide flakes.

[0008] In some embodiments, in the two-component potting adhesive, the surfactant in the surfactant-modified molybdenum disulfide flakes includes a cationic surfactant.

[0009] In some embodiments, in the two-component potting adhesive, the cationic surfactant includes at least one of cetylpyridinium chloride, cetyltrimethylammonium bromide, octadecyltrimethylammonium bromide, tetradecyltrimethylammonium bromide, and dodecylpyridinium chloride.

[0010] In some embodiments, in the two-component potting adhesive, the lateral dimension of the surfactant-modified molybdenum disulfide flakes is 10 nm-500 nm, and the thickness is 1 nm-100 nm.

[0011] In some of these embodiments, in the two-component potting adhesive, the specific surface area of the surfactant-modified molybdenum disulfide flakes is 75.5 m 2 / g to 98.6 m 2 / g.

[0012] In some of these embodiments, in the two-component potting adhesive, the component A satisfies at least one of the following characteristics:

[0013] (1) The viscosity of the hydroxyl-terminated polydimethylsiloxane at 25°C is 2000 cps to 6000 cps;

[0014] (2) The particle size D50 of the aluminum hydroxide is 1 μm to 10 μm.

[0015] In some of these embodiments, in the two-component potting adhesive, by mass, the component B includes the following components:

[0016] Dimethyl silicone oil 50 to 60 parts, silane crosslinking agent 35 to 45 parts, silane coupling agent 3 to 8 parts, and organotin catalyst 0.1 to 0.5 part.

[0017] In some of these embodiments, in the two-component potting adhesive, by mass, the component B includes the following components:

[0018] Dimethyl silicone oil 53 to 57 parts, silane crosslinking agent 39 to 41 parts, silane coupling agent 4 to 6 parts, and organotin catalyst 0.1 to 0.2 part.

[0019] In some of these embodiments, in the two-component potting adhesive, the component B satisfies at least one of the following characteristics:

[0020] (1) The viscosity of the dimethyl silicone oil at 25°C is 300 cps to 800 cps;

[0021] (2) The silane crosslinking agent includes at least one of tetraethyl orthosilicate and methyltrimethoxysilane;

[0022] (3) The silane coupling agent includes at least one of γ-aminopropyltrimethoxysilane oligomer, γ-aminopropyltriethoxysilane oligomer, and γ-glycidoxypropyltrimethoxysilane oligomer;

[0023] (4) The organotin catalyst includes at least one of dibutyltin dilaurate and stannous octoate.

[0024] In some of these embodiments, in the two-component potting adhesive, the mass ratio of the component A to the component B in use is 4.9 to 5.5:1.

[0025] The second aspect of the present application provides a method for preparing a two-component potting adhesive, comprising the following steps:

[0026] Provide raw materials according to the above two-component potting adhesive;

[0027] Mix the hydroxyl-terminated polydimethylsiloxane, aluminum hydroxide, and surfactant-modified molybdenum disulfide flakes to prepare Component A;

[0028] Provide Component B capable of curing Component A.

[0029] In some embodiments, in the method for preparing a two-component potting adhesive, the preparation of the surfactant-modified molybdenum disulfide flakes comprises the following steps:

[0030] Perform surface treatment on molybdenum disulfide flakes with a surfactant to prepare surfactant-modified molybdenum disulfide flakes.

[0031] In some embodiments, in the method for preparing a two-component potting adhesive, the preparation of the molybdenum disulfide flakes comprises the following steps:

[0032] Mix molybdenum disulfide powder and urea and then perform ball milling to prepare the molybdenum disulfide flakes.

[0033] The third aspect of the present application provides the application of the above two-component potting adhesive or the two-component potting adhesive prepared by the above preparation method in the preparation of photovoltaic modules.

[0034] The fourth aspect of the present application provides a photovoltaic module, comprising the above two-component potting adhesive or the application of the two-component potting adhesive prepared by the above preparation method in the preparation of photovoltaic modules.

[0035] Compared with the prior art, the two-component potting adhesive of the present application has the following beneficial effects:

[0036] The two-component potting adhesive of the present application includes Component A and Component B capable of curing Component A. Among them, in Component A, the surfactant-modified molybdenum disulfide flakes are combined with aluminum hydroxide and act with hydroxyl-terminated polydimethylsiloxane, and the specific ratio between the components is controlled. After mixing and curing with Component B, on the basis of ensuring that the curing hardness and tensile strength are basically not affected, the salt spray resistance of the two-component potting adhesive is effectively improved. Detailed Description of the Invention

[0037] Reference will now be provided in detail to embodiments of the invention, one or more examples of which are described below. Each example is provided by way of explanation and not limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment can be used in another embodiment to yield a still further embodiment.

[0038] Therefore, it is intended that the present invention covers such modifications and variations that fall within the scope of the appended claims and their equivalents. Other objects, features and aspects of the present invention are disclosed in or are obvious from the following detailed description. Those of ordinary skill in the art will appreciate that this discussion is only a description of exemplary embodiments and is not intended to limit the broader aspects of the present invention.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0040] The term "comprises", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "comprising one..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements. The indefinite articles "a kind of" and "an" before the elements or components of the present invention are not restrictive to the quantity requirements (i.e., the number of occurrences) of the elements or components. Therefore, "a" or "a kind of" should be interpreted as including one or at least one, and the elements or components in the singular form also include the plural form, unless the number clearly refers only to the singular form. The meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] The weight of the relevant components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also indicate the weight ratio between the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the description of the embodiments of the present invention, it is within the scope disclosed in the description of the embodiments of the present invention. Specifically, the weight described in the description of the embodiments of the present invention may be a mass unit known in the chemical industry such as μg, mg, g, kg, etc.

[0042] Except as otherwise shown in the operating examples or otherwise indicated, all numbers used in the specification and claims to indicate amounts of ingredients, physical and chemical properties, etc. are to be understood as being modified in all instances by the term "about". For example, thus, unless otherwise stated, the numerical parameters set forth in the above specification and the appended claims are approximations, and those skilled in the art can, using the teachings disclosed herein, seek to obtain the desired properties and appropriately vary these approximations. The use of a numerical range expressed with endpoints includes all numbers within that range and any range within that range. For example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4, and 5, and so on.

[0043] One embodiment of the present application provides a two-component potting adhesive, comprising component A and component B capable of curing component A; by mass parts, component A comprises the following components: 42 to 60 parts of hydroxyl-terminated polydimethylsiloxane, 40 to 50 parts of aluminum hydroxide, and 2 to 9 parts of surfactant-modified molybdenum disulfide flakes; the mass proportion of the surfactant-modified molybdenum disulfide flakes in component A is 3% to 7%.

[0044] The two-component potting adhesive of the present application comprises component A and component B capable of curing component A. In component A, the surfactant-modified molybdenum disulfide flakes are combined with aluminum hydroxide and act on the hydroxyl-terminated polydimethylsiloxane, and the specific proportions between the components are controlled. After mixing and curing with component B, on the basis that the curing hardness and tensile strength are basically not affected, the salt spray resistance performance of the two-component potting adhesive is effectively improved, and the thermal conductivity is relatively high.

[0045] The surface of the surfactant-modified molybdenum disulfide flakes has a variety of functional groups and is relatively easy to disperse. After surface treatment with a surfactant, a large number of active lipophilic groups will exist on its surface, and its compatibility with the base rubber hydroxyl-terminated polydimethylsiloxane is good and it can be evenly dispersed in the base rubber. After the surfactant-modified molybdenum disulfide flakes in a specific proportion are evenly dispersed in the base rubber, due to its flaky shape, a large-area protective layer can be formed to block the intrusion of corrosive medium ions in the salt spray, effectively improving the salt spray resistance performance of the two-component potting adhesive. However, if the proportion of the surfactant-modified molybdenum disulfide flakes is added improperly, the effect of improving the salt spray resistance performance cannot be achieved.

[0046] It can be understood that, by mass parts, in component A, the hydroxyl-terminated polydimethylsiloxane includes, but is not limited to, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 parts, 49 parts, 50 parts, 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 49 parts, 60 parts; the aluminum hydroxide includes, but is not limited to, 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 parts, 49 parts, 50 parts; the surfactant-modified molybdenum disulfide flakes include, but is not limited to, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts; the mass proportion of the surfactant-modified molybdenum disulfide flakes in component A includes, but is not limited to, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%; in some examples, it can be within the range formed by any two of these point values as the end values, and the same applies hereinafter.

[0047] In some of these examples, in the two-component potting adhesive, by mass parts, component A includes the following components:

[0048] 45 to 55 parts of hydroxyl-terminated polydimethylsiloxane, 41 to 49 parts of aluminum hydroxide, and 2.5 to 8 parts of surfactant-modified molybdenum disulfide flakes.

[0049] In some of these examples, in the two-component potting adhesive, by mass parts, component A includes the following components:

[0050] 48 to 52 parts of hydroxyl-terminated polydimethylsiloxane, 42 to 48 parts of aluminum hydroxide, and 3 to 7 parts of surfactant-modified molybdenum disulfide flakes.

[0051] It can be understood that, in some of these examples, in the two-component potting adhesive, by mass percentage, component A includes the following components:

[0052] 48 wt% to 52 wt% of hydroxyl-terminated polydimethylsiloxane, 42 wt% to 48 wt% of aluminum hydroxide, and 3 wt% to 7 wt% of surfactant-modified molybdenum disulfide flakes.

[0053] In some of these examples, in the two-component potting adhesive, the mass proportion of the surfactant-modified molybdenum disulfide flakes in component A is 3% to 6%.

[0054] In some of these examples, in the two-component potting adhesive, the surfactant in the surfactant-modified molybdenum disulfide flakes includes cationic surfactants.

[0055] In some of these examples, in the two-component potting adhesive, the cationic surfactant includes at least one of cetylpyridinium chloride, cetyltrimethylammonium bromide, octadecyltrimethylammonium bromide, tetradecyltrimethylammonium bromide, and dodecylpyridinium chloride.

[0056] In some of these examples, in the two-component potting adhesive, the surfactant-modified molybdenum disulfide flakes are surfactant-modified molybdenum disulfide nanosheets.

[0057] In some of these examples, in the two-component potting adhesive, the lateral size of the surfactant-modified molybdenum disulfide flakes is 10 nm to 500 nm, and the thickness is 1 nm to 100 nm.

[0058] It can be understood that the lateral size of the surfactant-modified molybdenum disulfide flakes includes but is not limited to 10 nm, 20 nm, 50 nm, 80 nm, 100 nm, 120 nm, 150 nm, 180 nm, 200 nm, 220 nm, 250 nm, 280 nm, 300 nm, 320 nm, 350 nm, 380 nm, 400 nm, 420 nm, 450 nm, 480 nm, 500 nm, and the thickness includes but is not limited to 1 nm, 10 nm, 15 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, 100 nm.

[0059] Optionally, the lateral size of the surfactant-modified molybdenum disulfide flakes is 200 nm to 400 nm, and the thickness is 10 nm to 100 nm. Further, the lateral size of the surfactant-modified molybdenum disulfide flakes is 300 nm to 350 nm, and the thickness is 10 nm to 40 nm.

[0060] By controlling the lateral size and thickness of the surfactant-modified molybdenum disulfide flakes, the salt spray resistance performance of the potting adhesive can be further improved.

[0061] In some of these examples, in the two-component potting adhesive, the specific surface area of the surfactant-modified molybdenum disulfide flakes is 75.5 m 2 / g to 98.6 m 2 / g.

[0062] By controlling the specific surface area of the surfactant-modified molybdenum disulfide flakes, the salt spray resistance performance of the potting adhesive can be further improved.

[0063] It can be understood that the specific surface area of the surfactant-modified molybdenum disulfide flakes includes but is not limited to 75.5 m 2 / g, 77 m 2 / g, 78.5 m 2 / g, 80 m 2 / g, 80.5 m 2 / g, 82.5 m 2 / g, 84.5 m 2 / g, 85 m 2 / g, 86.5 m 2 / g, 88.5 m 2 / g, 90 m 2 / g, 90.5 m 2 / g, 92.5 m 2 / g, 94.5 m 2 / g, 95 m 2 / g, 96.5 m 2 / g, 98.5 m 2 / g.

[0064] In some of these examples, in the two-component potting adhesive, the viscosity of the hydroxyl-terminated polydimethylsiloxane at 25 °C is 2000 cps to 6000 cps.

[0065] It can be understood that the viscosity of the hydroxyl-terminated polydimethylsiloxane at 25 °C includes but is not limited to 2000 cps, 3000 cps, 4000 cps, 5000 cps, 6000 cps.

[0066] Optionally, the viscosity of the hydroxyl-terminated polydimethylsiloxane at 25 °C is 3000 cps to 5000 cps.

[0067] In some of these examples, in the two-component potting adhesive, the D50 particle size of aluminum hydroxide is 1 μm to 10 μm.

[0068] It can be understood that the D50 particle size of aluminum hydroxide includes but is not limited to 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm.

[0069] Optionally, the D50 particle size of aluminum hydroxide is 2 μm to 6 μm.

[0070] In some of these examples, in the two-component potting adhesive, by mass fraction, component B includes the following components:

[0071] 50 to 60 parts of dimethyl silicone oil, 35 to 45 parts of silane crosslinking agent, 3 to 8 parts of silane coupling agent, and 0.1 to 0.5 part of organotin catalyst.

[0072] It can be understood that in Component B, by mass parts, the dimethyl silicone oil includes but is not limited to 51 parts, 52 parts, 53 parts, 54 parts, 55 parts, 56 parts, 57 parts, 58 parts, 49 parts, 60 parts; the silane crosslinking agent includes but is not limited to 35 parts, 36 parts, 37 parts, 38 parts, 39 parts, 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts; the silane coupling agent includes but is not limited to 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts; the organotin catalyst includes but is not limited to 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part.

[0073] In some of these examples, in the two-component potting adhesive, by mass parts, Component B includes the following components:

[0074] 53 - 57 parts of dimethyl silicone oil, 39 - 41 parts of silane crosslinking agent, 4 - 6 parts of silane coupling agent, and 0.1 - 0.2 part of organotin catalyst.

[0075] In some of these examples, in the two-component potting adhesive, the viscosity of the dimethyl silicone oil at 25°C is 300 cps - 800 cps.

[0076] It can be understood that the viscosity of the dimethyl silicone oil at 25°C includes but is not limited to 300 cps, 400 cps, 500 cps, 600 cps, 700 cps, 800 cps.

[0077] Optionally, the viscosity of the dimethyl silicone oil at 25°C is 500 cps - 700 cps.

[0078] In some of these examples, in the two-component potting adhesive, the silane crosslinking agent includes at least one of tetraethyl orthosilicate and methyltrimethoxysilane.

[0079] Optionally, the silane crosslinking agent includes tetraethyl orthosilicate and methyltrimethoxysilane.

[0080] Furthermore, the mass ratio of tetraethyl orthosilicate to methyltrimethoxysilane is 6 - 15:1.

[0081] It can be understood that the mass ratio of tetraethyl orthosilicate to methyltrimethoxysilane includes but is not limited to 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1.

[0082] In some of these examples, in the two-component potting adhesive, the silane coupling agent includes at least one of γ-aminopropyltrimethoxysilane oligomer (KH540), γ-aminopropyltriethoxysilane oligomer (KH550), and γ-glycidoxypropyltrimethoxysilane oligomer (KH560).

[0083] Optionally, the silane coupling agent includes γ-aminopropyltrimethoxysilane oligomer, γ-aminopropyltriethoxysilane oligomer, and γ-glycidyletheroxypropyltrimethoxysilane oligomer.

[0084] Furthermore, the mass ratio of γ-aminopropyltrimethoxysilane oligomer, γ-aminopropyltriethoxysilane oligomer, and γ-glycidyletheroxypropyltrimethoxysilane oligomer is 1-3:1-3:1.

[0085] It can be understood that the mass ratio of γ-aminopropyltrimethoxysilane oligomer, γ-aminopropyltriethoxysilane oligomer, and γ-glycidyletheroxypropyltrimethoxysilane oligomer includes but is not limited to 1:1:1, 2:1:1, 3:1:1, 1:2:1, 1:3:1, 2:2:1, 2:3:1, 3:2:1, 3:3:1.

[0086] In some examples, in the two-component potting adhesive, the organotin catalyst includes at least one of dibutyltin dilaurate and stannous octoate.

[0087] In some examples, in the two-component potting adhesive, the mass ratio of component A to component B in use is 4.9-5.5:1.

[0088] It can be understood that the mass ratio of component A to component B in use includes but is not limited to 4.9:1, 5:1, 5.1:1, 5.2:1, 5.3:1, 5.4:1, 5.5:1.

[0089] One embodiment of the present application provides a preparation method of a two-component potting adhesive, including the following steps:

[0090] Provide raw materials according to the above two-component potting adhesive;

[0091] Mix hydroxyl-terminated polydimethylsiloxane, aluminum hydroxide, and surfactant-modified molybdenum disulfide flakes to prepare component A;

[0092] Provide component B that can cure component A.

[0093] It can be understood that the preparation method of the two-component potting adhesive provided by the present application can prepare the above two-component potting adhesive, and the above two-component potting adhesive can be prepared by the preparation method of the two-component potting adhesive provided by the present application.

[0094] Furthermore, it can be understood that the preparation method of the two-component potting adhesive provided by the present application and the characteristics of the provided two-component potting adhesive can be mutually applicable.

[0095] In some of these examples, in the preparation method of the two-component potting adhesive, when preparing the A component, the hydroxyl-terminated polydimethylsiloxane, aluminum hydroxide, and surfactant-modified molybdenum disulfide flakes are placed in a planetary mixer and stirred evenly under vacuum, and the vacuum degree is -0.085 Mpa to -0.05 Mpa. Further, the stirring time is 0.5 h to 3 h.

[0096] In some of these examples, in the preparation method of the two-component potting adhesive, the preparation of the surfactant-modified molybdenum disulfide flakes includes the following steps:

[0097] The molybdenum disulfide flakes are surface-treated with a surfactant to prepare the surfactant-modified molybdenum disulfide flakes.

[0098] In some of these examples, in the preparation method of the two-component potting adhesive, the surface treatment includes the following steps:

[0099] The surfactant, molybdenum disulfide flakes, and solvent are mixed and ultrasonically dispersed.

[0100] In some of these examples, in the surface treatment step, the solvent includes ethanol.

[0101] In some of these examples, the surface treatment includes the following steps:

[0102] The surfactant and solvent are mixed to prepare a surfactant solution, and then the surfactant solution and molybdenum disulfide flakes are mixed.

[0103] In some of these examples, in the surface treatment step, the mass concentration of the surfactant solution is 3% to 8%.

[0104] It can be understood that the mass concentration of the surfactant solution includes but is not limited to 3%, 4%, 5%, 6%, 7%, 8%.

[0105] In some of these examples, in the surface treatment step, the temperature of the ultrasonic dispersion is 20°C to 30°C.

[0106] In some of these examples, in the surface treatment step, after ultrasonic dispersion, it further includes the steps of washing, drying, and grinding the dispersion liquid.

[0107] In some of these examples, in the preparation method of the two-component potting adhesive, the preparation of the molybdenum disulfide flakes includes the following steps:

[0108] The molybdenum disulfide powder and urea are mixed and then ball-milled to prepare the molybdenum disulfide flakes.

[0109] Urea is mixed with molybdenum disulfide powder and ground to form molybdenum disulfide flakes, which is beneficial to increase the specific surface area of molybdenum disulfide, increase hydrogen bonds at the same time, and introduce active groups of hydroxyl and amino groups on the surface of molybdenum disulfide nanosheets, so that metal ions can be effectively adsorbed when passing through in salt spray, thereby further improving the salt spray resistance of the two-component potting adhesive.

[0110] If a surfactant is used to modify molybdenum disulfide powder to obtain surfactant-modified molybdenum disulfide powder, and then further combined with aluminum hydroxide and reacted with hydroxyl-terminated polydimethylsiloxane, due to the smaller specific surface area of molybdenum disulfide powder compared with nanosheets, it cannot effectively adsorb ions and has poor salt spray resistance.

[0111] In some of these examples, in the preparation step of molybdenum disulfide flakes, the mass ratio of molybdenum disulfide powder to urea is 1:3 to 8.

[0112] It can be understood that the mass ratio of molybdenum disulfide powder to urea includes but is not limited to 1:3, 1:4, 1:5, 1:6, 1:7, 1:8.

[0113] In some of these examples, in the preparation step of molybdenum disulfide flakes, the rotation speed of ball milling is 1600 rpm to 2000 rpm, and the time is 6 h to 10 h.

[0114] It can be understood that the rotation speed of ball milling includes but is not limited to 1600 rpm, 1700 rpm, 1800 rpm, 1900 rpm, 2000 rpm, and the time includes but is not limited to 6 h, 7 h, 8 h, 9 h, 10 h.

[0115] In some of these examples, in the preparation step of molybdenum disulfide flakes, the mixture of molybdenum disulfide powder and urea is placed in an agate jar and ball milled using a planetary ball mill.

[0116] In some of these examples, in the preparation step of molybdenum disulfide flakes, after the ball milling step, it further includes subjecting the material obtained by ball milling to liquid-phase ultrasonic treatment.

[0117] In some of these examples, the liquid-phase ultrasonic treatment includes the following steps:

[0118] The material obtained by ball milling, water and an organic solvent are mixed and dispersed to obtain a dispersion;

[0119] After removing the molybdenum disulfide powder that has settled at the bottom of the dispersion, the dispersion is successively subjected to suction filtration, washing and drying to obtain molybdenum disulfide flakes.

[0120] It is understood that in the obtained dispersion, there are molybdenum disulfide flakes, unflaked molybdenum disulfide powder, and urea. The molybdenum disulfide flakes float on the liquid surface, the unflaked molybdenum disulfide powder sinks to the bottom of the dispersion, and urea dissolves in water.

[0121] In some of these examples, in the liquid-phase ultrasonic treatment step, the volume ratio of water to the organic solvent is 1:0.5 to 2.

[0122] It is understood that the volume ratio of water to the organic solvent includes but is not limited to 1:0.5, 1:1, and 1:2.

[0123] In some of these examples, in the liquid-phase ultrasonic treatment step, the organic solvent includes isopropanol.

[0124] In some of these examples, in the liquid-phase ultrasonic treatment step, the dispersion step includes:

[0125] Mix the materials obtained by ball milling, water, and the organic solvent, and then perform ultrasonic dispersion and centrifugation in sequence.

[0126] Optionally, the temperature of ultrasonic dispersion is 20°C to 30°C, and the time is 1 h to 3 h. Further, the temperature of ultrasonic dispersion is 25°C, and the time is 2 h.

[0127] Optionally, the rotation speed of centrifugation is 1000 r / min to 3000 r / min, and the time is 10 min to 30 min. Further, the rotation speed of centrifugation is 2000 r / min, and the time is 20 min.

[0128] In some of these examples, in the liquid-phase ultrasonic treatment step, the washing reagent includes ethanol.

[0129] In some of these examples, in the liquid-phase ultrasonic treatment step, the drying temperature is 50°C to 70°C, and the time is 6 h to 10 h. Optionally, the drying temperature is 60°C, and the time is 8 h.

[0130] In some of these examples, in the preparation method of the two-component potting adhesive, the preparation of component B includes the following steps:

[0131] Mix 50 to 60 parts of dimethyl silicone oil, 35 to 45 parts of silane cross-linking agent, 3 to 8 parts of silane coupling agent, and an organotin catalyst.

[0132] Further, place the dimethyl silicone oil, silane cross-linking agent, silane coupling agent, and organotin catalyst in a planetary stirrer and perform vacuum stirring until uniform. The vacuum degree is -0.085 Mpa to -0.05 Mpa. Further, the stirring time is 0.5 h to 3 h.

[0133] The two-component potting adhesive prepared by the preparation method of the two-component potting adhesive of the present application has good salt spray resistance performance.

[0134] One embodiment of the present application provides the application of the above two-component potting adhesive or the two-component potting adhesive prepared by the above preparation method in the preparation of photovoltaic modules. Another embodiment of the present application provides a photovoltaic module, comprising the above two-component potting adhesive or the two-component potting adhesive prepared by the above preparation method.

[0135] Since the photovoltaic module includes the above two-component potting adhesive or the two-component potting adhesive prepared by the above preparation method, it can endow the photovoltaic module with good salt spray resistance performance, especially effectively extend the service life of the offshore photovoltaic products.

[0136] It can be understood that the photovoltaic module can be applied in photovoltaic power stations, such as ground power stations, rooftop power stations, water surface power stations, etc., and can also be applied to devices or apparatuses that use solar energy for power generation, such as user solar power supplies, solar street lamps, solar cars, solar buildings, etc. It can also be understood that the application scenarios of the photovoltaic system include but are not limited to this, that is to say, the photovoltaic system can be applied in all fields that require solar power generation. Taking the photovoltaic power generation system network as an example, the photovoltaic system can include a photovoltaic array, a busbar box, and an inverter. The photovoltaic array can be an array combination of multiple photovoltaic modules. For example, multiple photovoltaic modules can form multiple photovoltaic arrays. The photovoltaic array is connected to the busbar box, and the busbar box can collect the current generated by the photovoltaic array. After the collected current flows through the inverter and is converted into alternating current required by the commercial power grid, it is connected to the commercial power grid to achieve solar power supply.

[0137] The photovoltaic module provided by the present application can be used but is not limited to electrical devices such as vehicles, ships, or aircraft.

[0138] An embodiment of the present application provides an electrical device, which can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0139] The following will further describe the present application in detail in conjunction with specific embodiments, but the embodiments of the present application are not limited thereto.

[0140] Example 1

[0141] Prepare surfactant-modified molybdenum disulfide flakes:

[0142] (1) Weigh 10 g of molybdenum disulfide powder and 50 g of urea, mix them and put them into an agate pot. Use a planetary ball mill to grind at a speed of 1600 rpm for 8 h to obtain a white sample;

[0143] (2) Add the white sample obtained in step (1) to 150 mL of a mixed solution of isopropanol / water (volume ratio 1:1). Ultrasonically disperse it at 25 °C for 2 h, then centrifuge the obtained dispersion at a speed of 2000 r / min for 20 min to obtain a dispersion liquid. Then vacuum filter the dispersion liquid through a 0.20 μm microporous filter membrane, wash it with absolute ethanol, and vacuum dry it at 60 °C for 8 hours to obtain molybdenum disulfide nanosheets;

[0144] (3) Ultrasonically disperse 150 mL of a 5% cetylpyridinium chloride absolute ethanol solution and 5 g of the molybdenum disulfide nanosheets prepared in step (2) at room temperature for 2 h. After cleaning, drying, and grinding, surfactant-modified molybdenum disulfide sheets are obtained, with a lateral size of 300 nm - 350 nm and a thickness of 15 nm - 20 nm.

[0145] Preparation of component A of the two-component potting adhesive:

[0146] (4) Weigh 50.0 parts by mass of hydroxyl-terminated polydimethylsiloxane (viscosity at 25 °C is 4000 cps), 46.0 parts by mass of aluminum hydroxide, and 4.0 parts by mass of the surfactant-modified molybdenum disulfide sheets prepared in step (3), and add them to a planetary stirrer. Stir evenly in a vacuum in the planetary stirrer, with a vacuum degree of -0.085 MPa to -0.05 Mpa, and discharge after 1.5 h. The mass ratio of the surfactant-modified molybdenum disulfide sheets in component A is 4%.

[0147] Preparation of component B of the two-component potting adhesive:

[0148] (5) Weigh 53.9 parts of dimethyl silicone oil (viscosity at 25 °C is 600 cps), 36.0 parts by mass of tetraethyl orthosilicate, 4.0 parts by mass of methyltrimethoxysilane, 2.0 parts by mass of γ-aminopropyltrimethoxysilane (KH540) oligomer, 2.0 parts by mass of γ-aminopropyltriethoxysilane (KH550) oligomer, 2.0 parts by mass of γ-glycidoxypropyltrimethoxysilane (KH560) oligomer, and 0.1 part of dibutyltin dilaurate catalyst. Add them to the planetary stirrer in sequence, stir evenly in a vacuum in the planetary stirrer, with a vacuum degree of -0.085 Mpa to -0.05 Mpa, and discharge after 1 h.

[0149] Example 2

[0150] Basically the same as Example 1, except that in the preparation of Component A of the two-component potting adhesive in step (4), the hydroxyl-terminated polydimethylsiloxane is 50.0 parts by mass, the aluminum hydroxide is 44.0 parts by mass, and the surfactant-modified molybdenum disulfide flakes prepared in step (3) are 6.0 parts by mass. The mass ratio of the surfactant-modified molybdenum disulfide flakes in Component A is 6%.

[0151] Example 3

[0152] Basically the same as Example 1, except that in the preparation of Component A of the two-component potting adhesive in step (4), the hydroxyl-terminated polydimethylsiloxane is 50.0 parts by mass, the aluminum hydroxide is 47.0 parts by mass, and the surfactant-modified molybdenum disulfide flakes prepared in step (3) are 3.0 parts by mass. The mass ratio of the surfactant-modified molybdenum disulfide flakes in Component A is 3%.

[0153] Example 4

[0154] Basically the same as Example 1, except that in the preparation of Component A of the two-component potting adhesive in step (4), the hydroxyl-terminated polydimethylsiloxane is 50.0 parts by mass, the aluminum hydroxide is 43.0 parts by mass, and the surfactant-modified molybdenum disulfide flakes prepared in step (3) are 7.0 parts by mass. The mass ratio of the surfactant-modified molybdenum disulfide flakes in Component A is 7%.

[0155] Example 5

[0156] Basically the same as Example 1, except that in step (3) for preparing the surfactant-modified molybdenum disulfide flakes, the 5% cetylpyridinium chloride anhydrous ethanol solution in Example 1 is replaced with an equal volume of 5% cetyltrimethylammonium bromide anhydrous ethanol solution

[0157] Example 6

[0158] Basically the same as Example 1, except that in the preparation of Component A of the two-component potting adhesive in step (4), the hydroxyl-terminated polydimethylsiloxane is 56.0 parts by mass, the aluminum hydroxide is 40.0 parts by mass, and the surfactant-modified molybdenum disulfide flakes prepared in step (3) are 4.0 parts by mass. The mass ratio of the surfactant-modified molybdenum disulfide flakes in Component A is 4%.

[0159] Example 7

[0160] Basically the same as Example 1, except that in the preparation of the surfactant-modified molybdenum disulfide flakes, the planetary ball mill grinds at a speed of 800 rpm for 8 h to obtain a white sample, and the finally obtained surfactant-modified molybdenum disulfide flakes have a lateral size of 300 nm - 350 nm and a thickness of 70 nm - 100 nm.

[0161] Comparative Example 1

[0162] It is basically the same as Example 1, except that in the preparation of Component A of the two-component potting adhesive in step (4), surfactant-modified molybdenum disulfide flakes are not added, 50.0 parts by mass of hydroxyl-terminated polydimethylsiloxane, and 50.0 parts by mass of aluminum hydroxide.

[0163] Comparative Example 2

[0164] It is basically the same as Example 1, except that in the preparation of Component A of the two-component potting adhesive in step (4), 50.0 parts by mass of hydroxyl-terminated polydimethylsiloxane, 48.0 parts by mass of aluminum hydroxide, and 2.0 parts by mass of surfactant-modified molybdenum disulfide flakes prepared in step (3) are used. The mass ratio of the surfactant-modified molybdenum disulfide flakes in Component A is 1%.

[0165] Comparative Example 3

[0166] It is basically the same as Example 1, except that in the preparation of Component A of the two-component potting adhesive in step (4), 50.0 parts by mass of hydroxyl-terminated polydimethylsiloxane, 42.0 parts by mass of aluminum hydroxide, and 8.0 parts by mass of surfactant-modified molybdenum disulfide flakes prepared in step (3) are used. The mass ratio of the surfactant-modified molybdenum disulfide flakes in Component A is 10%.

[0167] Comparative Example 4

[0168] (1) 5 g of molybdenum disulfide powder and 150 mL of 5% cetylpyridinium chloride anhydrous ethanol solution were ultrasonically dispersed at room temperature for 2 h, and after washing, drying, and grinding, surfactant-modified molybdenum disulfide powder was obtained.

[0169] Preparation of Component A of the two-component potting adhesive:

[0170] (4) Weigh 50.0 parts by mass of hydroxyl-terminated polydimethylsiloxane, 46.0 parts by mass of aluminum hydroxide, and 4.0 parts by mass of surfactant-modified molybdenum disulfide powder and add them to a planetary mixer, and stir evenly in a vacuum in the planetary mixer, with the vacuum degree being -0.085 MPa to -0.05 MPa, and discharge after 1.5 h.

[0171] The preparation of Component B of the two-component potting adhesive is the same as step (5) of Example 1.

[0172] Comparative Example 5

[0173] It is basically the same as Example 1, except that in the preparation of Component A of the two-component potting adhesive in step (4), weigh 50.0 parts by mass of hydroxyl-terminated polydimethylsiloxane, 46.0 parts by mass of aluminum hydroxide, and 4.0 parts by mass of molybdenum disulfide flakes prepared in step (2) of the example and stir evenly in a vacuum in a planetary mixer, with the vacuum degree being -0.085 MPa to -0.05 MPa, and discharge after 1.5 h.

[0174] Mix the component A and component B prepared in Examples 1 - 7 and Comparative Examples 1 - 5 in a mass ratio of 5.0:1.0; mix the component A and component B prepared in Example 1 in a mass ratio of 5.4:1.0, denoted as Example 8; mix the component A and component B prepared in Comparative Example 1 in a mass ratio of 5.4:1.0, denoted as Comparative Example 6.

[0175] Partial parameters of each example and comparative example are shown in Table 1.

[0176] Table 1

[0177]

[0178] In Table 1, "modified MoS 2 " refers to surfactant - modified molybdenum disulfide nanosheets in component A; "base gum" refers to hydroxyl - terminated polydimethylsiloxane; "A:B" refers to the mixing mass ratio of component A and component B.

[0179] Perform performance tests on each example and comparative example respectively.

[0180] Curing hardness (GB / T 531.1 - 2008), thermal conductivity (GB / T11205), tensile strength (GB / T 528 - 2009); The test specimens and experimental procedures for the salt spray test are as follows: The test specimens are all steel plates with dimensions of 150 mm×100 mm×1 mm. Remove the oil stain on the surface with a solvent and polish it clean with sandpaper. Apply the two - component potting adhesive mixed in each example and comparative example on the steel plate, and use a thickness controller to evenly apply the mixed two - component potting adhesive on the front, back, and side surfaces of the steel plate so that the potting adhesive completely covers the steel plate. The thickness of the potting adhesive is controlled at (150 ± 10) μm. After curing for 14 days under the standard test conditions of "temperature (23 ± 2)°C, relative humidity (50 ± 5)%", conduct the salt spray experiment, and note to ensure that the potting adhesive is completely cured. The salt spray test is carried out according to GB / T 1771—2007.

[0181] The results are shown in Table 2.

[0182] Table 2

[0183]

[0184] As can be seen from Table 2, the two-component potting adhesive prepared in the examples has good salt spray resistance, and has relatively high curing hardness and tensile strength. In Comparative Example 1 and Comparative Example 6, surfactant-modified molybdenum disulfide flakes were not added. In Comparative Example 2 and Comparative Example 3, the addition ratio of surfactant-modified molybdenum disulfide flakes was inappropriate, and rusting occurred during the salt spray test. In Comparative Example 4, molybdenum disulfide was not ball-milled into nanosheets, and the surfactant-modified molybdenum disulfide powder was directly reacted with hydroxyl-terminated polydimethylsiloxane and aluminum hydroxide, and rust spots or rusting occurred during the 400-hour salt spray test. In Comparative Example 5, molybdenum disulfide flakes were not first modified with a surfactant when preparing Component A, but were directly added to Component A. During the 400-hour salt spray test, the colloid cracked and rusting occurred.

[0185] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0186] The above-described embodiments only represent several implementation manners of the present application, which are convenient for understanding the technical solutions of the present application specifically and in detail, but should not be construed as a limitation on the protection scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments based on the technical solutions provided in the present application are all within the protection scope of the appended claims of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the content of the appended claims, and the description can be used to explain the content of the claims.

Claims

1. A two-component potting adhesive, characterized in that: The invention comprises a component A and a component B capable of curing the component A; the component A comprises the following components by weight: 42 to 60 parts of terminal hydroxyl polydimethylsiloxane, 40 to 50 parts of aluminum hydroxide and 2 to 9 parts of surfactant-modified molybdenum disulfide sheets; the mass proportion of the surfactant-modified molybdenum disulfide sheets in the component A is 3% to 7%, the surfactant in the surfactant-modified molybdenum disulfide sheets comprises a cationic surfactant, and the lateral size of the surfactant-modified molybdenum disulfide sheets is 10 nm to 500 nm, and the thickness is 1 nm to 100 nm; The B component includes the following components by mass: 50-60 parts of dimethyl silicone oil, 35-45 parts of silane crosslinking agent, 3-8 parts of silane coupling agent and 0.1-0.5 parts of organic tin catalyst.

2. The two-component potting adhesive according to claim 1, characterized in that: Calculated by mass, the A component includes the following components: 48-52 parts of terminal hydroxyl polydimethylsiloxane, 42-48 parts of aluminum hydroxide and 3-7 parts of surfactant-modified molybdenum disulfide sheets.

3. The two-component potting adhesive according to claim 1, characterized in that: The mass proportion of the surfactant-modified molybdenum disulfide sheets in the component A is 3% to 6%.

4. The two-component potting adhesive according to claim 1, characterized in that: The cationic surfactant includes at least one of cetylpyridinium chloride, cetyltrimethylammonium bromide, octadecyltrimethylammonium bromide, tetradecyltrimethylammonium bromide and dodecylpyridinium chloride.

5. The two-component potting adhesive according to claim 1, characterized in that: The specific surface area of ​​the surfactant-modified molybdenum disulfide sheet is 75.5 m 2 / g~98.6m 2 / g.

6. The two-component potting adhesive according to claim 1, characterized in that: The surfactant-modified molybdenum disulfide sheet has a lateral size of 200nm to 400nm and a thickness of 10nm to 100nm.

7. The two-component potting adhesive according to any one of claims 1 to 6, characterized in that: The A component satisfies at least one of the following characteristics: (1) The viscosity of the terminal hydroxyl polydimethylsiloxane at 25° C. is 2000 cps to 6000 cps; (2) The particle size D50 of the aluminum hydroxide is 1 μm to 10 μm.

8. The two-component potting adhesive according to any one of claims 1 to 6, characterized in that: The B component includes the following components by mass: 53-57 parts of dimethyl silicone oil, 39-41 parts of silane crosslinking agent, 4-6 parts of silane coupling agent and 0.1-0.2 parts of organic tin catalyst.

9. The two-component potting adhesive according to any one of claims 1 to 6, characterized in that: The B component meets at least one of the following characteristics: (1) The viscosity of the dimethyl silicone oil at 25° C. is 300 cps to 800 cps; (2) the silane crosslinking agent comprises at least one of ethyl orthosilicate and methyltrimethoxysilane; (3) The silane coupling agent includes at least one of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane; (4) The organic tin catalyst includes at least one of dibutyltin dilaurate and stannous octoate.

10. The two-component potting adhesive according to any one of claims 1 to 6, characterized in that: The mass ratio of the component A to the component B is 4.9-5.5:

1.

11. A method for preparing a two-component potting compound, characterized in that: The following steps are involved: Providing raw materials according to the two-component potting adhesive according to any one of claims 1 to 10; The terminal hydroxyl polydimethylsiloxane, aluminum hydroxide and surfactant-modified molybdenum disulfide flakes are mixed to prepare component A; A B component is provided which is capable of curing the A component.

12. The preparation method according to claim 11, characterized in that: The preparation of the surfactant-modified molybdenum disulfide sheet comprises the following steps: The surface of the molybdenum disulfide sheet is treated by using a surfactant to prepare the surfactant-modified molybdenum disulfide sheet.

13. The preparation method according to claim 12, characterized in that: The preparation of the molybdenum disulfide sheet comprises the following steps: The molybdenum disulfide sheet is prepared by mixing molybdenum disulfide powder and urea and then ball milling.

14. A photovoltaic module, characterized in that: The invention comprises the two-component potting adhesive as claimed in any one of claims 1 to 10 or the two-component potting adhesive prepared by the preparation method as claimed in any one of claims 11 to 13.

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