Two-component fast-curing photovoltaic sealant with low water vapor transmittance

Abstract

The invention discloses a low water vapor transmittance two-component fast curing photovoltaic sealant which is composed of a component A and a component B. The mixing mass ratio of the component A to the component B is 10: 1. The component A is prepared from the following components in parts by weight: A1. 100 parts of alpha, omega-dihydroxy polydimethylsiloxane; a2, 10 to 20 parts of dimethyl silicone oil; a3, 50 to 150 parts of polyisobutene; a4, 50 to 150 parts of reinforcing filler; a5, 10 to 50 parts of barrier filler; a6, 0.1 to 2 parts of a deep curing agent; the component B is prepared from the following components in parts by weight: B1, 100 parts of dimethyl silicone oil; b2, 50 to 150 parts of reinforcing filler; b3, 15 to 50 parts of a cross-linking agent; b4, 10 to 30 parts of a silane coupling agent; b5, 0.1 to 2 parts of a catalyst; the polyisobutene resin and the barrier filler are introduced into the organic silicon sealant, the good hydrophobicity and water vapor barrier property of polyisobutene and the water blocking function of a lamellar structure of the barrier filler are utilized, the water vapor barrier property of the sealant is reduced through combination of the polyisobutene resin and the barrier filler, and the organic silicon sealant has the advantages of aging resistance, high and low temperature resistance, electrical insulation and good adhesion.

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a low water vapor permeability two-component fast-curing photovoltaic sealant. Background Art

[0002] Two-component silicone sealant is made of silicone resin as the base resin, mixed with cross-linking agent, filler, catalyst and other components. Each component is stored in two different packages. When used, it can be cross-linked and cured into an elastomer by mixing in a certain ratio. Two-component silicone sealant has the advantages of stable storage, fast curing speed, and low requirements for external environmental temperature and humidity. It is especially suitable for photovoltaic components, electronics, home appliances and other industries that have high production rhythm requirements. The main component of two-component silicone sealant is silicone resin. Thanks to the high bond energy and flexibility of the silicone resin molecular chain, silicone sealant has excellent high and low temperature resistance, insulation performance and weather resistance, so it is especially suitable for photovoltaic components that need to work outdoors for a long time.

[0003] One of the most worrying issues when photovoltaic modules are working outdoors is the impact of water vapor. Once water vapor penetrates into the module, it will first cause the cell packaging material to react and degrade, producing acidic byproducts that corrode the cell. Secondly, water vapor will also react with the cell to cause the cell performance to deteriorate. At present, the conventional sealing material for photovoltaic modules is silicone sealant, but the moisture permeability of silicone rubber sealant is 60g / m 2 ·d(@1mm), the barrier effect on water vapor is insufficient, and it is difficult to form a strict protection for photovoltaic modules.

[0004] In addition, with the emergence of a new generation of high-performance batteries such as HJT and perovskite batteries, they are more sensitive to water vapor, and photovoltaic modules have also put forward higher requirements on the water vapor permeability of sealing materials. The current conventional silicone sealants cannot meet the requirements of these emerging technologies. Summary of the invention

[0005] The object of the present invention is to provide a two-component fast-curing photovoltaic sealant with low water vapor transmission rate to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A two-component fast-curing photovoltaic sealant with low water vapor transmission rate, the sealant consists of a component A and a component B, and the mixing mass ratio of the component A to the component B is 10:1.

[0008] The component A is composed of the following components by weight:

[0009] A1. 100 parts of α, ω-dihydroxy polydimethylsiloxane;

[0010] A2. 10-20 parts of dimethyl silicone oil;

[0011] A3. 50 to 150 parts of polyisobutylene;

[0012] A4. 50 to 150 parts of reinforcing filler;

[0013] A5. 10 to 50 parts of barrier filler;

[0014] A6. Deep curing agent 0.1-2 parts;

[0015] The B component is composed of the following components by weight:

[0016] B1. 100 parts of dimethyl silicone oil;

[0017] B2. 50 to 150 parts of reinforcing filler;

[0018] B3. 15 to 50 parts of a cross-linking agent;

[0019] B4. 10 to 30 parts of silane coupling agent;

[0020] B5. 0.1 to 2 parts of catalyst;

[0021] The A1 component is α,ω-dihydroxy polydimethylsiloxane, and its molecular structure is HO[(CH3)2SiO] n H, viscosity is 5000~50000mpa·s.

[0022] The A2 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] n Si(CH3)3, viscosity is 100~1000mPa·s.

[0023] The A3 component is a polyisobutylene resin with a molecular weight of 500 to 100,000.

[0024] The A4 component is a reinforcing filler, which is selected from at least one of fumed silica, precipitated silica, nano calcium carbonate, silica powder, and white corundum, or a combination of several fillers.

[0025] The A5 component is a barrier filler, which is selected from at least one of molecular sieve, montmorillonite, and mica powder, or a combination of several fillers.

[0026] The A6 component is a deep curing agent, and pure water is selected.

[0027] The B1 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] nSi(CH3)3, viscosity is 1000~20000mPa·s.

[0028] The B2 component is a reinforcing filler, which is selected from at least one of fumed silica, precipitated silica, nano calcium carbonate, silica powder, and white corundum, or a combination of several fillers.

[0029] The B3 component is a crosslinking agent, which is selected from at least one of methyltrimethoxysilane, vinyltrimethoxysilane, methyl orthosilicate, ethyl orthosilicate, propyl orthosilicate and partial hydrolyzates of the above crosslinking agents or a combination of several thereof.

[0030] The B4 component is a silane coupling agent, which is a reactant of one or more coupling agents selected from amino silane coupling agents, epoxy silane coupling agents, mercapto silane coupling agents, acrylate silane coupling agents, etc.

[0031] The B5 component is a catalyst, which is an organic tin or organic titanium catalyst, and is selected from at least one of dibutyltin dilaurate, dibutyltin diacetate, dibutyltin oxide, tetra-tert-butyl titanate, tetraisobutyl titanate, and tetraisopropyl titanate.

[0032] The preparation method of component A comprises the following steps: adding components A1, A2, A3, A4 and A5 in the above-mentioned weight proportions into a stirring kettle, dehydrating for 2 to 4 hours at 110 to 130° C. and -0.09 to -0.1 MPa vacuum conditions, then cooling to 40° C., adding component A6, and stirring for 10 minutes at -0.09 to -0.1 MPa vacuum conditions until the mixture is uniform and free of bubbles.

[0033] The preparation method of component B comprises the following steps: adding components B1 and B2 in the above-mentioned weight proportions into a stirring kettle, dehydrating for 2 to 4 hours at 110 to 130° C. and under vacuum conditions of -0.09 to -0.1 MPa, then cooling to 40° C., adding component B3, stirring for 10 minutes at vacuum conditions of -0.09 to -0.1 MPa, and finally adding components B4 and B5, stirring for 10 minutes at vacuum conditions of -0.09 to -0.1 MPa until the mixture is uniform and free of bubbles.

[0034] A two-component fast-curing photovoltaic sealant with low water vapor transmission rate is prepared by the following method: after component A and component B are prepared, they are mixed at a volume ratio of 10:1, the mixing is carried out by a static mixing tube, and the finished product is obtained after the mixing is uniform.

[0035] In summary, due to the adoption of the above technology, the beneficial effects of the present invention are:

[0036] The present invention introduces polyisobutylene resin and barrier filler into the silicone sealant, utilizes the good hydrophobicity and water vapor barrier of polyisobutylene, and the water barrier function of the barrier filler sheet structure, and combines the two to reduce the water vapor barrier of the sealant, while having the advantages of aging resistance, high and low temperature resistance, electrical insulation, and good adhesion. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0038] Example 1

[0039] A low water vapor transmission rate two-component fast-curing photovoltaic sealant, the sealant consists of component A and component B, and the mixing volume ratio of component A to component B is 10:1;

[0040] The component A is composed of the following components by weight:

[0041] A1. 100 parts of α, ω-dihydroxy polydimethylsiloxane;

[0042] A2. 18 parts of dimethyl silicone oil;

[0043] A3. 90 parts of polyisobutylene;

[0044] A4. 130 parts of reinforcing filler;

[0045] A5. 40 parts of barrier filler;

[0046] A6. 0.5 parts of deep curing agent;

[0047] The B component is composed of the following components by weight:

[0048] B1. 100 parts of dimethyl silicone oil;

[0049] B2. 110 parts of reinforcing filler;

[0050] B3. 35 parts of cross-linking agent;

[0051] B4. 15 parts of silane coupling agent;

[0052] B5. 0.3 parts of catalyst.

[0053] The A1 component is α,ω-dihydroxy polydimethylsiloxane, and its molecular structure is HO[(CH3)2SiO] n H, viscosity is 5000mpa·s.

[0054] The A2 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] n Si(CH3)3, viscosity is 100mpa·s.

[0055] The A3 component is a polyisobutylene resin with a molecular weight of 500.

[0056] The A4 component is a reinforcing filler, and nano calcium carbonate is selected;

[0057] The A5 component is a barrier filler, and a molecular sieve is selected;

[0058] The A6 component is a deep curing agent, and pure water is selected.

[0059] The B1 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] n Si(CH3)3, viscosity is 10000mPa·s;

[0060] The B2 component is a reinforcing filler, and nano calcium carbonate is selected;

[0061] The B3 component is a cross-linking agent, and tetraethyl orthosilicate is selected;

[0062] The B4 component is a silane coupling agent, and γ-aminopropyltriethoxysilane is selected.

[0063] The B5 component is a catalyst, and dibutyltin dilaurate is selected.

[0064] The preparation method of component A comprises the following steps: adding components A1, A2, A3, A4 and A5 in the above-mentioned weight proportions into a stirring kettle, dehydrating for 2 hours at 110° C. and -0.09 MPa vacuum conditions, then cooling to 40° C., adding component A6, and stirring for 10 minutes at -0.09 MPa vacuum conditions until the mixture is uniform and free of bubbles.

[0065] The preparation method of component B comprises the following steps: adding components B1 and B2 in the above-mentioned weight proportions into a stirring kettle, dehydrating for 2 hours at 110° C. and -0.09 MPa vacuum conditions, then cooling to 40° C. and adding component B3, stirring for 10 minutes at -0.09 MPa vacuum conditions, and finally adding components B4 and B5, stirring for 10 minutes at -0.09 MPa vacuum conditions until uniform and free of bubbles.

[0066] After component A and component B are prepared, they are mixed at a volume ratio of 10:1. The mixing is performed using a static mixing tube, and the finished product is obtained after the mixture is evenly mixed.

[0067] Example 2

[0068] A low water vapor transmission rate two-component fast-curing photovoltaic sealant, the sealant consists of component A and component B, and the mixing volume ratio of component A to component B is 10:1;

[0069] The component A is composed of the following components by weight:

[0070] A1. 100 parts of α, ω-dihydroxy polydimethylsiloxane;

[0071] A2. 15 parts of dimethyl silicone oil;

[0072] A3. 70 parts of polyisobutylene;

[0073] A4. 100 parts of reinforcing filler;

[0074] A5. 30 parts of barrier filler;

[0075] A6. 0.8 parts of deep curing agent;

[0076] The B component is composed of the following components by weight:

[0077] B1. 100 parts of dimethyl silicone oil;

[0078] B2. 120 parts of reinforcing filler;

[0079] B3. 40 parts of cross-linking agent;

[0080] B4. 25 parts of silane coupling agent;

[0081] B5. 0.2 parts of catalyst.

[0082] The A1 component is α,ω-dihydroxy polydimethylsiloxane, and its molecular structure is HO[(CH3)2SiO] n H, viscosity is 20000mpa·s.

[0083] The A2 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] n Si(CH3)3, viscosity is 1000mpa·s.

[0084] The A3 component is a polyisobutylene resin with a molecular weight of 100,000.

[0085] The A4 component is a reinforcing filler, and silicon powder is selected;

[0086] The A5 component is a barrier filler, and mica powder is selected;

[0087] The A6 component is a deep curing agent, and pure water is selected.

[0088] The B1 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] n Si(CH3)3, viscosity is 20000mpa·s.

[0089] The B2 component is a reinforcing filler, and silicon powder is selected;

[0090] The B3 component is a crosslinking agent, and vinyl trimethoxy silane is selected;

[0091] The B4 component is a silane coupling agent, and γ-aminopropyltrimethoxysilane is selected.

[0092] The B5 component is a catalyst, and dibutyltin diacetate is selected.

[0093] The preparation method of component A comprises the following steps: adding components A1, A2, A3, A4 and A5 in the above-mentioned weight proportions into a stirring kettle, dehydrating for 4 hours at 130° C. and -0.1 MPa vacuum conditions, then cooling to 40° C., adding component A6, and stirring for 10 minutes at -0.1 MPa vacuum conditions until the mixture is uniform and free of bubbles.

[0094] The preparation method of component B comprises the following steps: adding components B1 and B2 in the above-mentioned weight proportions into a stirring kettle, dehydrating at 130° C. and -0.1 MPa vacuum conditions for 4 hours, then cooling to 40° C. and adding component B3, stirring at -0.1 MPa vacuum conditions for 10 minutes, and finally adding components B4 and B5, stirring at -0.1 MPa vacuum conditions for 10 minutes until the mixture is uniform and free of bubbles.

[0095] After component A and component B are prepared, they are mixed at a volume ratio of 10:1. The mixing is performed using a static mixing tube, and the finished product is obtained after the mixture is evenly mixed.

[0096] Example 3

[0097] A low water vapor transmission rate two-component fast-curing photovoltaic sealant, the sealant consists of component A and component B, and the mixing volume ratio of component A to component B is 10:1;

[0098] The component A is composed of the following components by weight:

[0099] A1. 100 parts of α, ω-dihydroxy polydimethylsiloxane;

[0100] A2. 18 parts of dimethyl silicone oil;

[0101] A3. 100 parts of polyisobutylene;

[0102] A4. 60 parts of reinforcing filler;

[0103] A5. 40 parts of barrier filler;

[0104] A6. 0.6 parts of deep curing agent;

[0105] The B component is composed of the following components by weight:

[0106] B1. 100 parts of dimethyl silicone oil;

[0107] B2. 80 parts of reinforcing filler;

[0108] B3. 40 parts of cross-linking agent;

[0109] B4. 20 parts of silane coupling agent;

[0110] B5. 0.5 parts of catalyst.

[0111] The A1 component is α,ω-dihydroxy polydimethylsiloxane, and its molecular structure is HO[(CH3)2SiO] n H, viscosity is 20000mpa·s.

[0112] The A2 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] n Si(CH3)3, viscosity is 1000mpa·s.

[0113] The A3 component is a polyisobutylene resin with a molecular weight of 100,000.

[0114] The A4 component is a reinforcing filler, and silicon powder is selected;

[0115] The A5 component is a barrier filler, and talcum powder is selected;

[0116] The A6 component is a deep curing agent, and pure water is selected.

[0117] The B1 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] n Si(CH3)3, viscosity is 10000mpa·s.

[0118] The B2 component is a reinforcing filler, and is selected from precipitated silica;

[0119] The B3 component is a crosslinking agent, and vinyl trimethoxy silane is selected;

[0120] The B4 component is a silane coupling agent, and γ-aminopropyltrimethoxysilane is selected.

[0121] The B5 component is a catalyst, and dibutyltin diacetate is selected.

[0122] The preparation method of component A comprises the following steps: adding components A1, A2, A3, A4 and A5 in the above-mentioned weight proportions into a stirring kettle, dehydrating for 4 hours at 130° C. and -0.1 MPa vacuum conditions, then cooling to 40° C., adding component A6, and stirring for 10 minutes at -0.1 MPa vacuum conditions until the mixture is uniform and free of bubbles.

[0123] The preparation method of component B comprises the following steps: adding components B1 and B2 in the above-mentioned weight proportions into a stirring kettle, dehydrating at 130° C. and -0.1 MPa vacuum conditions for 4 hours, then cooling to 40° C. and adding component B3, stirring at -0.1 MPa vacuum conditions for 10 minutes, and finally adding components B4 and B5, stirring at -0.1 MPa vacuum conditions for 10 minutes until the mixture is uniform and free of bubbles.

[0124] After component A and component B are prepared, they are mixed at a volume ratio of 10:1. The mixing is performed using a static mixing tube, and the finished product is obtained after the mixture is evenly mixed.

[0125] Comparative Example 1

[0126] A low water vapor transmission rate two-component fast-curing photovoltaic sealant, the sealant consists of component A and component B, and the mixing volume ratio of component A to component B is 10:1;

[0127] The component A is composed of the following components by weight:

[0128] A1. 100 parts of α, ω-dihydroxy polydimethylsiloxane;

[0129] A2. 20 parts of dimethyl silicone oil;

[0130] A3. 150 parts of reinforcing filler;

[0131] A4. 2 parts of deep curing agent;

[0132] The B component is composed of the following components by weight:

[0133] B1. 100 parts of dimethyl silicone oil;

[0134] B2. 150 parts of reinforcing filler;

[0135] B3. 50 parts of cross-linking agent;

[0136] B4. 30 parts of silane coupling agent;

[0137] B5. 2 parts of catalyst.

[0138] The A1 component is α,ω-dihydroxy polydimethylsiloxane, and its molecular structure is HO[(CH3)2SiO] n H, viscosity is 50000mpa·s.

[0139] The A2 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] n Si(CH3)3, viscosity is 1000mpa·s.

[0140] The A3 component is a reinforcing filler, and nano calcium carbonate is selected;

[0141] The A4 component is a deep curing agent, and pure water is selected.

[0142] The B1 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] n Si(CH3)3, viscosity is 20000mpa·s.

[0143] The B2 component is a reinforcing filler, and nano calcium carbonate is selected;

[0144] The B3 component is a cross-linking agent, and propyl orthosilicate is selected;

[0145] The B4 component is a silane coupling agent, and γ-aminopropyltrimethoxysilane is selected.

[0146] The B5 component is a catalyst, and dibutyltin dilaurate is selected.

[0147] The preparation method of component A comprises the following steps: adding components A1, A2, A3, A4 and A5 in the above-mentioned weight proportions into a stirring kettle, dehydrating for 4 hours at 130° C. and -0.1 MPa vacuum conditions, then cooling to 40° C., adding component A6, and stirring for 10 minutes at -0.1 MPa vacuum conditions until the mixture is uniform and free of bubbles.

[0148] The preparation method of component B comprises the following steps: adding components B1 and B2 in the above-mentioned weight proportions into a stirring kettle, dehydrating at 130° C. and -0.1 MPa vacuum conditions for 4 hours, then cooling to 40° C. and adding component B3, stirring at -0.1 MPa vacuum conditions for 10 minutes, and finally adding components B4 and B5, stirring at -0.1 MPa vacuum conditions for 10 minutes until the mixture is uniform and free of bubbles.

[0149] The low water vapor transmission rate two-component fast curing photovoltaic sealant prepared in the above Example 1 has the following performance indicators:

[0150]

[0151] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0152] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Claims

1. A two-component fast-curing photovoltaic sealant with low water vapor transmission rate, characterized in that: The sealant is composed of component A and component B, and the mixing volume ratio of component A to component B is 10:1; The component A is composed of the following components by weight: A1. 100 parts of α, ω-dihydroxy polydimethylsiloxane; A2. 10-20 parts of dimethyl silicone oil; A3. 50 to 150 parts of polyisobutylene; A4. 50-150 parts of reinforcing filler; A5. 10 to 50 parts of barrier filler; A6. Deep curing agent 0.1-2 parts; The B component is composed of the following components by weight: B1. 100 parts of dimethyl silicone oil; B2. 50 to 150 parts of reinforcing filler; B3. 15 to 50 parts of a cross-linking agent; B4. 10 to 30 parts of silane coupling agent; B5. 0.1 to 2 parts of catalyst.

2. A two-component fast-curing photovoltaic sealant with low water vapor transmission rate according to claim 1, characterized in that: The A1 component is α,ω-dihydroxy polydimethylsiloxane, and its molecular structure is HO[(CH3)2SiO] n H, viscosity is 5000~50000mpa·s.

3. The low water vapor transmission rate two-component fast curing photovoltaic sealant according to claim 1, characterized in that: The A2 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] n Si(CH3)3, viscosity is 100~1000mPa·s.

4. The low water vapor transmission rate two-component fast curing photovoltaic sealant according to claim 1, characterized in that: The A3 component is a polyisobutylene resin with a molecular weight of 500 to 100,000.

5. The low water vapor transmission rate two-component fast curing photovoltaic sealant according to claim 1, characterized in that: The A4 component is a reinforcing filler, which is selected from at least one of fumed silica, precipitated silica, nano calcium carbonate, silica powder, and white corundum, or a combination of several fillers.

6. The A5 component is a barrier filler, which is selected from at least one of molecular sieve, montmorillonite, and mica powder, or a combination of several fillers; The A6 component is a deep curing agent, and pure water is selected.

7. The low water vapor transmission rate two-component fast curing photovoltaic sealant according to claim 1, characterized in that: The B1 component is dimethyl silicone oil, and its molecular structure is (CH3)3SiO[(CH3)2SiO] n Si(CH3)3, viscosity is 1000~20000mPa·s.

8. The low water vapor transmission rate two-component fast curing photovoltaic sealant according to claim 1, characterized in that: The B3 component is a crosslinking agent, which is selected from at least one of methyltrimethoxysilane, vinyltrimethoxysilane, methyl orthosilicate, ethyl orthosilicate, propyl orthosilicate and partial hydrolyzates of the above crosslinking agents or a combination of several thereof; The B4 component is a silane coupling agent, which is a reactant of one or more coupling agents selected from amino silane coupling agents, epoxy silane coupling agents, mercapto silane coupling agents, acrylate silane coupling agents, etc.; The B5 component is a catalyst, which is an organic tin or organic titanium catalyst, and is selected from at least one of dibutyltin dilaurate, dibutyltin diacetate, dibutyltin oxide, tetra-tert-butyl titanate, tetraisobutyl titanate, and tetraisopropyl titanate.

9. The low water vapor transmission rate two-component fast curing photovoltaic sealant according to claim 1, characterized in that: The preparation method of component A comprises the following steps: adding components A1, A2, A3, A4 and A5 in the above-mentioned weight proportions into a stirring kettle, dehydrating for 2 to 4 hours at 110 to 130° C. and -0.09 to -0.1 MPa vacuum conditions, then cooling to 40° C., adding component A6, and stirring for 10 minutes at -0.09 to -0.1 MPa vacuum conditions until the mixture is uniform and free of bubbles.

10. The low water vapor transmission rate two-component fast curing photovoltaic sealant according to claim 1, characterized in that: The preparation method of component B comprises the following steps: adding components B1 and B2 in the above-mentioned weight proportions into a stirring kettle, dehydrating for 2 to 4 hours at 110 to 130° C. and under vacuum conditions of -0.09 to -0.1 MPa, then cooling to 40° C., adding component B3, stirring for 10 minutes at vacuum conditions of -0.09 to -0.1 MPa, and finally adding components B4 and B5, stirring for 10 minutes at vacuum conditions of -0.09 to -0.1 MPa until the mixture is uniform and free of bubbles.

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