Two-component pouring sealant for sediment-resistant photovoltaic module and preparation method thereof

Abstract

The application discloses a kind of two-component pouring sealant for sedimentation-resistant photovoltaic module and a preparation method thereof.The two-component pouring sealant for photovoltaic module includes component A and component B.Component A includes the following raw materials: alpha, omega-dihydroxypolydimethylsiloxane, modified reinforcing filler and deep curing agent.Component B includes the following raw materials: silicone oil, coupling agent, crosslinking agent and catalyst.Compared with traditional two-component pouring sealant, the application significantly improves the sedimentation resistance of silicone pouring sealant and prolongs the storage time of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pouring sealant processing, and particularly relates to a two-component pouring sealant for a sedimentation-resistant photovoltaic module and a preparation method thereof. BACKGROUND

[0002] Silicone rubber is an organic polysiloxane polymer. Due to its chemical structure, it has both organic and inorganic properties. Two-component pouring sealants have a wide range of applications in photovoltaic module junction boxes due to their low viscosity, flowability, and fast curing. They can effectively protect electronic components from the intrusion of external water molecules. However, the low polarity of organic silicon and the inorganic powder may settle to the bottom of the container under long-term static conditions, which may adversely affect the use of the pouring sealant.

[0003] Currently, the main method for resisting sedimentation on the market is to use two different particle sizes of powder in combination. However, this may result in a large viscosity of the glue, which is not conducive to the operation of the glue machine and has certain limitations. SUMMARY

[0004] The present application aims to provide a two-component pouring sealant for a sedimentation-resistant photovoltaic module and a preparation method thereof. Through chemical modification, the powder has both organic and inorganic properties, which can solve the problem of poor sedimentation performance and improve the stability of the product.

[0005] A two-component pouring sealant for a sedimentation-resistant photovoltaic module, comprising A component and B component; the A component comprises, by weight fraction, 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 20.5-105 parts of modified reinforcing filler, and 0.5-5 parts of deep curing agent.

[0006] The B component comprises, by weight fraction, 20-100 parts of silicone oil, 0.5-5 parts of coupling agent, 0.5-20 parts of crosslinking agent, and 0.1-10 parts of catalyst.

[0007] The modified reinforcing filler is prepared by coating the reinforcing filler with an anti-settling agent.

[0008] The preparation process of the modified reinforcing filler is as follows: the anti-settling agent and the reinforcing filler are blended and dried to obtain the modified reinforcing filler; the mass ratio of the anti-settling agent to the reinforcing filler is 0.5-5:20-100.

[0009] The viscosity of the alpha, omega-dihydroxy polydimethylsiloxane in the A component at 25 DEG C is 1500-10000 mpa·s, preferably 1500 mpa·s.

[0010] The silicone oil in the B component is one or a combination of methyl silicone oil, hydroxyl silicone oil, vinyl silicone oil or amino silicone oil, preferably methyl silicone oil with viscosity of 10-200 mpa·s at 25℃, more preferably methyl silicone oil with viscosity of 50 mpa·s at 25℃.

[0011] The reinforcing filler is one or a combination of montmorillonite, nano calcium carbonate, aluminum hydroxide, fumed silica, silicon powder or quartz powder; preferably, the reinforcing filler contains 40-60% aluminum hydroxide by mass percentage, and the rest is one or a combination of fumed silica or magnesium hydroxide.

[0012] The anti-settling agent is one or a combination of stearic acid, amino silicone oil emulsion, SBR emulsion, hexamethyldisilazane or polyamide wax; preferably, stearic acid is compounded with polyamide wax or SBR emulsion is compounded with hexamethyldisilazane, more preferably, stearic acid is compounded with polyamide wax at a mass ratio of 4:1 or SBR emulsion is compounded with hexamethyldisilazane at a mass ratio of 3:1.

[0013] The deep curing agent is one or a combination of soda ash, copper vitriol, green vitriol or white vitriol.

[0014] The coupling agent is one or a combination of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, vinyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane or vinyltrimethoxysilane, preferably at least two of γ-aminopropyltriethoxysilane, vinyltrimethoxysilane or γ-aminopropyltrimethoxysilane;

[0015] The cross-linking agent is one or a combination of tetraethyl orthosilicate, tetramethyl orthosilicate, n-propyltrimethoxysilane, vinyltriacetyloxy silane, polymethyl triethoxysilane or ethyltriacetyloxy silane;

[0016] The catalyst is one or a combination of chelated tin, stannous octoate, stannous isooctoate, dibutyltin dilaurate or dibutyltin diacetate.

[0017] A preparation method of a two-component pouring sealant for a non-settling photovoltaic module, comprising the following steps:

[0018] Preparation of component A: the anti-settling agent is blended with the reinforcing filler and dried to obtain a modified reinforcing filler; the modified reinforcing filler and the deep curing agent are sequentially added to α, ω-dihydroxypolydimethylsiloxane, mixed and stirred, vacuum degassed to obtain component A;

[0019] Preparation of component B: the silicone oil, coupling agent, cross-linking agent and catalyst are mixed and stirred, vacuum degassed to obtain component B.

[0020] The anti-settling agent and the reinforcing filler are blended at a temperature of 80-90 DEG C for 30-45 min at a stirring speed of 180-200 r / min; during preparation of the components A and B, the mixing and stirring time is 25-60 min, and the vacuum degree is -0.09 to -0.06 MPa.

[0021] The mass ratio of the component A to the component B is 4-6:1, preferably 6:1.

[0022] The application has the following beneficial effects:

[0023] The two-component pouring sealant of the application adopts a special modification method, i.e. the reinforcing filler is physically coated by the anti-settling agent, which improves the compatibility between the filler and the silicone oil, effectively avoids the settling phenomenon caused by the difference in density and polarity, and not only ensures the uniform surface drying of the pouring sealant, but also effectively avoids the viscosity rise of the pouring sealant.

[0024] The preparation process is simplified by optimizing the formula and process parameters during preparation of the pouring sealant, which is beneficial to workshop operation. DETAILED DESCRIPTION

[0025] The embodiments of the application will be described in detail below with reference to the examples, but those skilled in the art will understand that the following examples are only used to illustrate the application and should not be regarded as limiting the scope of the application.

[0026] The viscosity of the alpha, omega-dihydroxypolydimethylsiloxane used in the following examples and comparative examples at 25 DEG C is 1500 mpa.s, and the viscosity of the methyl silicone oil at 25 DEG C is 150 mpa.s.

[0027] Example 1

[0028] Preparation of modified aluminum hydroxide: 2 parts of stearic acid and 0.5 parts of polyamide wax are compounded, and then mixed with 10 parts of aluminum hydroxide, stirred at 80 DEG C for 45 min at a stirring speed of 180 r / min, the stearic acid and the polyamide wax jointly coat the aluminum hydroxide to obtain the modified aluminum hydroxide;

[0029] Preparation of modified magnesium hydroxide: 2 parts of stearic acid and 0.5 parts of polyamide wax are compounded, and then mixed with 10 parts of magnesium hydroxide, stirred at 80 DEG C for 45 min at a stirring speed of 180 r / min, the stearic acid and the polyamide wax jointly coat the magnesium hydroxide to obtain the modified magnesium hydroxide;

[0030] Preparation of A component: the modified aluminum hydroxide and modified magnesium hydroxide prepared above were added into 100 parts of α, ω-dihydroxy polydimethylsiloxane, 1 part of copperas was added, and stirring was carried out at 40°C for 45 min by using a planetary machine under a vacuum degree of -0.09 MPa to obtain A component;

[0031] Preparation of B component: 100 parts of methyl silicone oil, 0.5 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of vinyltrimethoxysilane, 0.5 parts of γ-aminopropyltriethoxysilane, 0.5 parts of ethyl silicate and 0.5 parts of chelated tin were added into a planetary machine, stirring was carried out at 23°C for 30 min under a vacuum degree of -0.09 MPa, and vacuum degassing was carried out to obtain B component.

[0032] Example 2

[0033] Different from example 1, the modified reinforcing filler in A component only added modified magnesium hydroxide, and the amount of modified magnesium hydroxide was twice that of example 1.

[0034] Preparation of A component: the modified magnesium hydroxide was added into 100 parts of α, ω-dihydroxy polydimethylsiloxane, 1 part of copperas was added, and stirring was carried out at 40°C for 45 min by using a planetary machine under a vacuum degree of -0.09 MPa to obtain A component;

[0035] Preparation of B component: 100 parts of methyl silicone oil, 0.5 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of vinyltrimethoxysilane, 0.5 parts of γ-aminopropyltriethoxysilane, 0.5 parts of ethyl silicate and 0.5 parts of chelated tin were added into a planetary machine, stirring was carried out at 23°C for 30 min under a vacuum degree of -0.09 MPa, and vacuum degassing was carried out to obtain B component.

[0036] Example 3

[0037] Different from example 1, the modified reinforcing filler in A component only added modified aluminum hydroxide, and the amount of modified aluminum hydroxide was twice that of example 1.

[0038] Preparation of A component: the modified aluminum hydroxide was added into 100 parts of α, ω-dihydroxy polydimethylsiloxane, 1 part of copperas was added, and stirring was carried out at 40°C for 45 min by using a planetary machine under a vacuum degree of -0.09 MPa to obtain A component;

[0039] Preparation of B component: 100 parts of methyl silicone oil, 0.5 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of vinyltrimethoxysilane, 0.5 parts of γ-aminopropyltriethoxysilane, 0.5 parts of ethyl silicate and 0.5 parts of chelated tin were added into a planetary machine, stirring was carried out at 23°C for 30 min under a vacuum degree of -0.09 MPa, and vacuum degassing was carried out to obtain B component.

[0040] Example 4

[0041] Different from example 1, the anti-settling agent is selected as SBR emulsion and hexamethyldisilazane, which are compounded in a mass ratio of 3:1.

[0042] Preparation of modified aluminum hydroxide: 1.5 parts of SBR emulsion and 0.5 parts of hexamethyldisilazane are compounded, and then mixed with 10 parts of aluminum hydroxide. Stirring is carried out at 80℃ for 45 min at a stirring speed of 180 r / min. SBR and hexamethyldisilazane are used to coat aluminum hydroxide together to obtain modified aluminum hydroxide.

[0043] Preparation of modified magnesium hydroxide: 1.5 parts of SBR emulsion and 0.5 parts of hexamethyldisilazane are compounded, and then mixed with 10 parts of magnesium hydroxide. Stirring is carried out at 80℃ for 45 min at a stirring speed of 180 r / min. SBR and hexamethyldisilazane are used to coat magnesium hydroxide together to obtain modified magnesium hydroxide.

[0044] Preparation of component A: The modified aluminum hydroxide and modified magnesium hydroxide prepared above are all added into 100 parts of α,ω-dihydroxypolydimethylsiloxane, and then 1 part of green vitriol is added. Stirring is carried out at 40℃ for 45 min by using a planetary machine under a vacuum degree of-0.09 MPa to obtain component A.

[0045] Preparation of component B: 100 parts of methyl silicone oil, 0.5 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of vinyltrimethoxysilane, 0.5 parts of γ-aminopropyltriethoxysilane, 0.5 parts of tetraethyl orthosilicate, and 0.5 parts of chelated tin are added into a planetary machine. Stirring is carried out at 23℃ for 30 min under a vacuum degree of-0.09 MPa to obtain component B.

[0046] Example 5

[0047] Different from example 1, the deep curing agent is selected as green vitriol.

[0048] Preparation of component A: The modified aluminum hydroxide and modified magnesium hydroxide prepared in example 1 are all added into 100 parts of α,ω-dihydroxypolydimethylsiloxane, and then 1 part of green vitriol is added. Stirring is carried out at 40℃ for 45 min by using a planetary machine under a vacuum degree of-0.09 MPa to obtain component A.

[0049] Preparation of component B: 100 parts of methyl silicone oil, 0.5 parts of γ-aminopropyltrimethoxysilane, 0.5 parts of vinyltrimethoxysilane, 0.5 parts of γ-aminopropyltriethoxysilane, 0.5 parts of tetraethyl orthosilicate, and 0.5 parts of chelated tin are added into a planetary machine. Stirring is carried out at 23℃ for 30 min under a vacuum degree of-0.09 MPa to obtain component B.

[0050] Example 6

[0051] Different from example 1, the coupling agent is 1 part of γ-aminopropyl trimethoxysilane and 0.5 parts of γ-aminopropyl triethoxysilane.

[0052] Preparation of component A: the modified aluminum hydroxide and modified magnesium hydroxide prepared in example 1 are all added into 100 parts of α, ω-dihydroxy polydimethylsiloxane, 1 part of copperas is added, and a planetary machine is used to stir at 40℃ for 45 min under a vacuum degree of-0.09 MPa to obtain component A;

[0053] Preparation of component B: 100 parts of methyl silicone oil, 0.5 parts of γ-aminopropyl trimethoxysilane, 0.5 parts of γ-aminopropyl triethoxysilane, 0.5 parts of tetraethyl orthosilicate and 0.5 parts of chelated tin are added into a planetary machine, stirred at 23℃ for 30 min under a vacuum degree of-0.09 MPa, and vacuum degassed to obtain component B.

[0054] Comparative example 1

[0055] Different from example 1, the aluminum hydroxide and aluminum hydroxide are not pre-modified, and both are directly added into 100 parts of α, ω-dihydroxy polydimethylsiloxane together with stearic acid and polyamide wax.

[0056] The components A and B of the above examples and comparative examples are mixed uniformly according to a mass ratio of 6:1, and tested according to GB / T29595-2013. The initial surface dry time, gel time, tensile strength, viscosity of component A and hardness of the two-component pouring sealant are tested, and the results are shown in Table 1.

[0057] Table 1: Performance test results of pouring sealant prepared in examples and comparative examples

[0058]

[0059] From the above data, it can be seen that the two-component pouring sealant provided by the application has better anti-settling property than the pouring sealant prepared from unmodified powder, and can also improve the viscosity of the system, promote deep curing of the glue, and reduce the influence of water vapor in the environment on the glue. According to examples 1, 4 and comparative example 1, the use of stearic acid and polyamide wax in combination and SBR emulsion and hexamethyldisilazane in combination can significantly improve the mechanical strength of the glue. According to the data of examples 1, 2 and 3, the use of modified aluminum hydroxide and modified magnesium hydroxide in combination can further improve the anti-settling effect. In addition, the pouring sealant prepared from unmodified powder also has the problem of too long surface dry time, which affects the actual use of the pouring sealant.

Claims

1. A two-component pouring sealant for a sedimentation-resistant photovoltaic module, comprising a component A and a component B, characterized in that the component A comprises, by weight fraction, 100 parts of alpha, omega-dihydroxypolydimethylsiloxane, 20.5-105 parts of modified reinforcing filler, and 0.5-5 parts of deep curing agent; the component B comprises, by weight fraction, 20-100 parts of silicone oil, 0.5-5 parts of coupling agent, 0.5-20 parts of crosslinking agent, and 0.1-10 parts of catalyst; the modified reinforcing filler is prepared by coating a reinforcing filler with an anti-sedimentation agent; the anti-sedimentation agent is a compound of stearic acid and polyamide wax or a compound of SBR emulsion and hexamethyldisilazane; the preparation process of the modified reinforcing filler comprises blending and drying the anti-sedimentation agent and the reinforcing filler to obtain the modified reinforcing filler; the mass ratio of the anti-sedimentation agent to the reinforcing filler is 0.5-5:20-100; the anti-sedimentation agent and the reinforcing filler are blended at a temperature of 80-90°C for 30-45 min at a stirring speed of 180 r / min-200 r / min; the alpha, omega-dihydroxypolydimethylsiloxane in the component A has a viscosity of 1500-10000 mPa·s at 25°C; the silicone oil in the component B is one or a combination of methyl silicone oil, hydroxyl silicone oil, vinyl silicone oil, and amino silicone oil; the reinforcing filler is one or a combination of montmorillonite, nano calcium carbonate, aluminum hydroxide, fumed silica, silicon powder, and quartz powder; the reinforcing filler contains 40-60% aluminum hydroxide by mass percentage, and the rest is one or a combination of fumed silica and magnesium hydroxide; the anti-sedimentation agent is a compound of stearic acid and polyamide wax at a mass ratio of 4:1 or a compound of SBR emulsion and hexamethyldisilazane at a mass ratio of 3:1; the deep curing agent is one or a combination of soda ash, copper vitriol, green vitriol, and white vitriol; the coupling agent is one or a combination of gamma-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, gamma-glycidyl ether propyltrimethoxysilane, gamma-methacryloyloxypropyltrimethoxysilane, vinyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and vinyltrimethoxysilane; the crosslinking agent is one or a combination of tetraethyl orthosilicate, tetramethyl orthosilicate, n-propyltrimethoxysilane, vinyltriacetyloxy silane, polymethyl triethoxysilane, and ethyltriacetyloxy silane; the catalyst is one or a combination of chelated tin, stannous octoate, stannous isooctoate, dibutyltin dilaurate, and dibutyltin diacetate; the coupling agent is at least a combination of gamma-aminopropyltriethoxysilane, vinyltrimethoxysilane, and gamma-aminopropyltrimethoxysilane; the alpha, omega-dihydroxypolydimethylsiloxane in the component A has a viscosity of 1500 mPa·s at 25°C; the silicone oil in the component B is methyl silicone oil with a viscosity of 10-200 mPa·s at 25°C; the silicone oil in the component B is methyl silicone oil with a viscosity of 50 mPa·s at 25°C; and the steps are as follows: ​ ​ ​ ​ ​ ​ 2. The two-component pouring sealant for a sedimentation-resistant photovoltaic module according to claim 1, characterized by, ​ ​ 3. The two-component pouring sealant for a sedimentation-resistant photovoltaic module according to claim 1, characterized in that, ​ 4. The two-component pouring sealant for a sedimentation-resistant photovoltaic module according to claim 1, characterized by, ​ 5. The two-component pouring sealant for a sedimentation-resistant photovoltaic module according to claim 1, characterized by, ​ 6. The two-component pouring sealant for a sedimentation-resistant photovoltaic module according to claim 1, characterized in that, ​ 7. The two-component pouring sealant for a sedimentation-resistant photovoltaic module according to claim 1, characterized in that, ​ ​ ​ 8. The two-component pouring sealant for a sedimentation-resistant photovoltaic module according to claim 1, characterized by, ​ 9. The two-component pouring sealant for a sedimentation-resistant photovoltaic module according to claim 1, characterized in that, ​ 10. The two-component pouring sealant for a sedimentation-resistant photovoltaic module according to claim 1, characterized by, ​ 11. The two-component pouring sealant for a sedimentation-resistant photovoltaic module according to claim 1, characterized in that, ​ 12. The method for preparing a two-component pouring sealant for a sedimentation-resistant photovoltaic module according to any one of claims 1 to 11, characterized in that, ​ Preparation of A component: the anti-settling agent is blended with the reinforcing filler to dry to obtain a modified reinforcing filler; the modified reinforcing filler and the deep curing agent are sequentially added into the α, ω-dihydroxypolydimethylsiloxane, mixed and stirred, vacuum degassed to obtain A component; Preparation of B component: the silicone oil, the coupling agent, the crosslinking agent and the catalyst are mixed and stirred, vacuum degassed to obtain B component.

13. The method of claim 12, wherein the method further comprises: In the preparation process of A and B components, the mixing and stirring time is 25-60 min, and the vacuum degree is -0.09 to -0.06 MPa. ​ 14. The method of claim 12, wherein the two-component potting adhesive for a photovoltaic module resistant to sedimentation is prepared by mixing the first component and the second component in a weight ratio of 1:1 to 1:

2. The mass ratio of A component to B component is 6:1.

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