High-strength fast-curing two-component organic silicon sealant for photovoltaic module and preparation method of high-strength fast-curing two-component organic silicon sealant

Abstract

The invention discloses a high-strength fast-curing two-component organic silicon sealant for a photovoltaic module and a preparation method of the high-strength fast-curing two-component organic silicon sealant, and belongs to the technical field of two-component organic silicon sealants. The organic silicon sealant is composed of a component A and a component B in a volume ratio of 1: 1, the component A is composed of 35-80 parts by weight of alpha, omega-dihydroxy polydimethylsiloxane, 40-70 parts by weight of nano calcium carbonate, 1-15 parts by weight of MQ silicon resin, 1-10 parts by weight of a plasticizer, 1-5 parts by weight of white paste and 0.25-3 parts by weight of a deep curing agent, and the component B is composed of 30-60 parts by weight of alpha, omega-dihydroxy polydimethylsiloxane, 40-70 parts by weight of nano calcium carbonate and 0.25-3 parts by weight of a deep curing agent. The silicone rubber is prepared from the following components in parts by weight: 60-70 parts of alpha, omega-dihydroxy polydimethylsiloxane, 40-70 parts of nano calcium carbonate, 5-20 parts of a cross-linking agent, 5-15 parts of a silane coupling agent and 0.01-1 part of a catalyst. The organic silicon sealant has the advantages of high strength, fast curing and the like.

Description

Technical Field

[0001] The invention relates to the technical field of two-component silicone sealants, and in particular to a high-strength, fast-curing two-component silicone sealant for photovoltaic modules and a preparation method thereof. Background Art

[0002] In recent years, with the rapid development of artificial intelligence technology, it has brought a lot of convenience to our lives, but also brought huge electricity consumption. In the face of this challenge, sustainable green energy provides a solution to this problem. Solar energy is a green, clean and renewable energy. The photovoltaic power generation system converts solar energy into electrical energy through the "photoelectric effect". The key is the solar panel, which is composed of a group of crystalline silicon cells and a layer of ultra-thin, transparent, high-strength glass and a sealed bottom layer. Photovoltaic components are installed and fixed on the frame with sealants to form solar panels. Silicone sealants are an indispensable part of solar photovoltaic components and are used to bond the frame and photovoltaic panels.

[0003] The main chain of silicone sealant molecules is composed of silicon-oxygen bonds with high bond energy, so it has good high and low temperature resistance, weather resistance and electrical insulation properties. However, due to its weak intermolecular force, its mechanical properties are particularly poor. Unreinforced silicone sealants are basically of no use value. The reinforcement of silicone sealants has always been a hot issue. The introduction of some inorganic fillers can effectively improve the mechanical properties of silicone sealants. For example, the introduction of silica, carbon nanotubes, and cage-type silsesquioxanes can effectively improve the mechanical properties of silicone sealants. However, these fillers aggregate in the silicone adhesive matrix under the action of Brownian motion and van der Waals forces, making it difficult to disperse well in the silicone sealant matrix, and will cause the viscosity of the silicone adhesive to increase, affecting its production.

[0004] Shanghai Huitian Chemical New Materials Co., Ltd. has applied for a Chinese patent with the patent number CN200810201877.1. The mechanical properties of silicone sealants are improved by using mixed fillers such as white carbon black, quartz powder, and silicon powder. Although the mechanical properties of silicone sealants are improved. However, the price of fillers is high, which will increase the production cost of enterprises and is not conducive to large-scale production. Xu Xiaoming published "Preparation and Performance of Ketoximine Silane Chain Extension / Crosslinking Low Modulus Silicone Sealant" in the Journal of Polymer Materials and Engineering. By using homemade silane coupling agents containing cyano and secondary amine groups as thickeners, compared with traditional thickeners, homemade thickeners can effectively improve the mechanical properties and bonding strength of silicone sealants and shorten the surface drying time. However, the process of homemade thickeners is complicated, which is not conducive to continuous large-scale production of enterprises and increases the production and manufacturing costs of enterprises. Therefore, balancing production costs and mechanical properties has always been a difficult problem.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a high-strength, fast-curing two-component silicone sealant for photovoltaic modules and a preparation method thereof, thereby solving the above-mentioned technical problems existing in the prior art.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] A high-strength, fast-curing two-component silicone sealant for photovoltaic modules, the silicone sealant is composed of component A and component B in a volume ratio of 1:1, wherein:

[0009] Component A includes the following raw materials in parts by weight, each raw material is:

[0010]

[0011] Component B includes the following raw materials in parts by weight, each raw material is:

[0012]

[0013] A method for preparing the high-strength fast-curing two-component silicone sealant for photovoltaic modules comprises the following steps:

[0014] According to the formula of the high-strength and fast-curing two-component organic silicon sealant for photovoltaic modules of the present invention, raw materials of component A and component B are taken to prepare component A and component B respectively;

[0015] Preparation of component A: Add α,ω-dihydroxypolydimethylsiloxane, nano calcium carbonate, MQ silicone resin, plasticizer and white slurry in the raw materials of component A into a planetary mixer, heat to 120°C, evacuate to -0.09MPa, stir for 60-120min, cool to room temperature, add deep curing agent, stir for 60-120min, evacuate to -0.09MPa, and discharge to obtain component A;

[0016] Preparation of component B: Add α,ω-dihydroxypolydimethylsiloxane and nano calcium carbonate in the raw materials of component B into a planetary mixer, heat to 120°C, evacuate to -0.09MPa, stir for 60 to 120 minutes, then add a crosslinking agent and a coupling agent, stir for 30 to 60 minutes, finally add a catalyst, stir for 30 to 60 minutes, and discharge to obtain component B;

[0017] Preparation of organic silicon sealant: The component A and component B prepared above are mixed in a volume ratio of 1:1 to obtain a high-strength, fast-curing two-component organic silicon sealant for photovoltaic modules.

[0018] Compared with the prior art, the high-strength and fast-curing two-component silicone sealant for photovoltaic modules and the preparation method thereof provided by the present invention have the following beneficial effects:

[0019] (1) The mechanical properties of silicone sealant are enhanced by MQ silicone resin. Its rigid structure can increase the physical entanglement of the molecular chains of silicone sealant. The hydroxyl groups on its surface can condense with α, ω-dihydroxypolydimethylsiloxane, thereby enhancing the mechanical properties of silicone sealant through chemical and physical effects. Therefore, it has good mechanical properties and tensile strength ≥3MPa.

[0020] (2) One feature of the silicone sealant of the present invention is its high strength. Photovoltaic modules are exposed to relatively harsh conditions, such as deserts and oceans, which are subject to severe weather such as strong winds and rainstorms. Once the strength of the sealant is low, it will cause the sealant to tear and be damaged, which will eventually cause the photovoltaic module to fail or be damaged. The high strength of this product will reduce the occurrence of these situations and improve the reliability, stability and durability of photovoltaic modules.

[0021] (3) Because MQ silicone resin is obtained by condensation of hexamethyldisiloxane and tetraethyl silicate, its molecular chain contains a large number of hydroxyl groups. Compared with the α,ω-dihydroxypolydimethylsiloxane molecule, its molecular weight is relatively small. Therefore, MQ silicone resin acts as a catalyst during the curing process, thus accelerating the curing speed of silicone sealant.

[0022] (4) Another feature of the silicone sealant of the present invention is fast curing, wherein fast curing can improve the production efficiency of downstream component factories, reduce the area of ​​curing rooms, and ultimately reduce the manufacturing costs of customers.

[0023] (5) Compared with traditional products, the organic silicon sealant of the present invention can use the existing production line without adding new equipment, so the production cost of this product is consistent with that of traditional products. Finally, this product has the characteristics of low cost while improving product performance. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in combination with the specific content of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0025] First, the terms that may be used in this article are explained as follows:

[0026] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0027] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0028] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0029] The term "parts by mass" refers to the mass ratio relationship between multiple components. For example, if it is described that component X is x parts by mass and component Y is y parts by mass, then the mass ratio of component X to component Y is x:y. 1 part by mass can represent any mass, for example, 1 part by mass can be represented as 1 kg or 3.1415926 kg. The sum of the parts by mass of all components is not necessarily 100 parts, but can be greater than 100 parts, less than 100 parts or equal to 100 parts. Unless otherwise specified, the parts, proportions and percentages described herein are all measured by mass.

[0030] When concentration, temperature, pressure, size or other parameters are expressed in the form of a numerical range, the numerical range should be understood to specifically disclose all ranges formed by the pairing of any upper limit, lower limit, and preferred value in the numerical range, regardless of whether the range is explicitly stated; for example, if a numerical range of "2 to 8" is stated, the numerical range should be interpreted as including ranges such as "2 to 7", "2 to 6", "5 to 7", "3 to 4 and 6 to 7", "3 to 5 and 7", "2 and 5 to 7", etc. Unless otherwise specified, the numerical ranges stated herein include both their end values ​​and all integers and fractions within the numerical range.

[0031] The scheme provided by the present invention is described in detail below. The contents not described in detail in the embodiments of the present invention belong to the prior art known to professionals in the field. If the specific conditions are not specified in the embodiments of the present invention, they are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturers are not specified in the reagents or instruments used in the embodiments of the present invention, they are all conventional products that can be purchased commercially.

[0032] The embodiment of the present invention provides a high-strength and fast-curing two-component silicone sealant for photovoltaic modules. The silicone sealant is composed of component A and component B in a volume ratio of 1:1, wherein:

[0033] Component A includes the following raw materials in parts by weight, each raw material is:

[0034]

[0035]

[0036] Component B includes the following raw materials in parts by weight, each raw material is:

[0037]

[0038] Preferably, in the above-mentioned silicone sealant, the α,ω-dihydroxy polydimethylsiloxane in the component A and the component B is a terminal hydroxyl polydimethylsiloxane, and the viscosity at 25° C. is 20,000 to 80,000 mPa·s.

[0039] Preferably, in the above-mentioned silicone sealant, the particle size of the nano-calcium carbonate in the component A and the component B is 0.01-200 μm.

[0040] Preferably, in the above-mentioned organic silicone sealant, the molar ratio of the M group to the Q group in the MQ silicone resin in the A component is 0.6 to 0.8, and the number average molecular weight is 2000 to 4000.

[0041] Preferably, in the above-mentioned silicone sealant, the plasticizer in the component A is dimethyl silicone oil, and the viscosity at 25° C. is 100 to 500 mPa·s.

[0042] Preferably, in the above-mentioned silicone sealant, the deep curing agent in component A is one or more of deionized water, aqueous phosphate solution, and potassium glycerophosphate.

[0043] Preferably, in the above-mentioned silicone sealant, the crosslinking agent in the B component is one or more of methyl tributylacetonato oxime silane, vinyl tributylacetonato oxime silane, methyl triacetone oxime, and dimethyl dibutyl ketone oxime silane.

[0044] Preferably, in the above-mentioned silicone sealant, the silane coupling agent in the B component is one or two of γ-aminopropyltriethoxysilane, methyltriethoxysilane, vinyltriethoxysilane, and aminosilane polymer, and the catalyst includes one or more of dibutyltin dilaurate, dibutyltin dilaurate acetate, dibutyltin diacetylacetonate.

[0045] The embodiment of the present invention also provides a method for preparing the high-strength fast-curing two-component silicone sealant for photovoltaic modules, comprising the following steps:

[0046] According to the above formula of high-strength fast-curing two-component organic silicon sealant for photovoltaic modules, raw materials of component A and component B are taken to prepare component A and component B respectively;

[0047] Preparation of component A: Add α,ω-dihydroxypolydimethylsiloxane, nano calcium carbonate, MQ silicone resin, plasticizer and white slurry in the raw materials of component A into a planetary mixer, heat to 120°C, evacuate to -0.09MPa, stir for 60-120min, cool to room temperature, add deep curing agent, stir for 60-120min, evacuate to -0.09MPa, and discharge to obtain component A;

[0048] Preparation of component B: Add α,ω-dihydroxypolydimethylsiloxane and nano calcium carbonate in the raw materials of component B into a planetary mixer, heat to 120°C, evacuate to -0.09MPa, stir for 60 to 120 minutes, then add a crosslinking agent and a coupling agent, stir for 30 to 60 minutes, finally add a catalyst, stir for 30 to 60 minutes, and discharge to obtain component B;

[0049] Preparation of organic silicon sealant: The component A and component B prepared above are mixed in a volume ratio of 1:1 to obtain a high-strength, fast-curing two-component organic silicon sealant for photovoltaic modules.

[0050] In summary, the organic silicone sealant of the embodiment of the present invention has at least the following advantages:

[0051] (1) The mechanical properties of silicone sealant are enhanced by MQ silicone resin. Its rigid structure can increase the physical entanglement of the molecular chains of silicone sealant. The hydroxyl groups on its surface can condense with α, ω-dihydroxypolydimethylsiloxane, thereby enhancing the mechanical properties of silicone sealant through chemical and physical effects. Therefore, it has good mechanical properties and tensile strength ≥3MPa.

[0052] (2) Because MQ silicone resin is obtained by condensation of hexamethyldisiloxane and tetraethyl silicate, its molecular chain contains a large number of hydroxyl groups. Compared with the α,ω-dihydroxypolydimethylsiloxane molecule, its molecular weight is relatively small. Therefore, MQ silicone resin acts as a catalyst during the curing process, thus accelerating the curing speed of silicone sealant.

[0053] (3) One feature of the silicone sealant of the present invention is its high strength. Photovoltaic modules are exposed to relatively harsh conditions, such as deserts and oceans, which are subject to severe weather such as strong winds and rainstorms. Once the strength of the sealant is low, it will cause the sealant to tear and be damaged, which will eventually cause the photovoltaic module to fail or be damaged. The high strength of this product will reduce the occurrence of these situations and improve the reliability, stability and durability of photovoltaic modules.

[0054] (4) Another feature of the silicone sealant of the present invention is fast curing, wherein fast curing can improve the production efficiency of downstream component factories, reduce the area of ​​curing rooms, and ultimately reduce the manufacturing costs of customers.

[0055] (5) Compared with traditional products, the organic silicon sealant of the present invention can use the existing production line without adding new equipment, so the production cost of this product is consistent with that of traditional products. Finally, this product has the characteristics of low cost while improving product performance.

[0056] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the solution provided by the embodiment of the present invention is described in detail with specific embodiments below.

[0057] Examples 1 to 5 and Comparative Example 1

[0058] The raw materials used and the weight proportions of the raw materials of the high-strength, fast-curing two-component silicone sealant for photovoltaic modules provided in the embodiments and comparative examples are shown in Tables 1 and 2.

[0059] Table 1 shows the A component of Examples 1 to 5 and Comparative Example 1

[0060]

[0061] Table 2 shows the B component of Examples 1 to 5 and Comparative Example 1

[0062]

[0063] The preparation method of the high-strength fast-curing two-component silicone sealant for photovoltaic modules of this embodiment is as follows, comprising the following steps:

[0064] Take the raw materials of component A and component B according to Table 1 and Table 2 above, respectively, to prepare component A and component B;

[0065] Preparation of component A: Add α,ω-dihydroxypolydimethylsiloxane, nano calcium carbonate, plasticizer, MQ silicone resin and white slurry in the raw materials of component A into a planetary mixer, rotate at 1000 rpm, heat to 120°C, evacuate to -0.09 MPa, stir for 80 min, cool to room temperature, add deep curing agent, stir for 60 min, rotate at 1200 rpm, and discharge to obtain component A;

[0066] Preparation of component B: Add α,ω-dihydroxypolydimethylsiloxane and nano calcium carbonate in the raw materials of component B into a planetary mixer at a speed of 1000 rpm, heat to 120°C, evacuate to -0.09 MPa, stir for 80 min, cool to room temperature, add crosslinking agent and coupling agent and stir for 30 min at a speed of 1200 rpm, then add catalyst and stir for 40 min at a speed of 1200 rpm, and discharge to obtain component B;

[0067] The component A and the component B prepared above are mixed in a volume ratio of 1:1 to obtain a two-component organic silicone sealant for photovoltaic modules.

[0068] The silicone sealants of Examples 1 to 5 and Comparative Example 1 were tested for properties such as surface drying time, 2h curing depth, tensile strength, elongation at break, and aging. The test results are shown in Table 3.

[0069] Table 3 is the test results of Examples 1 to 5 and Comparative Example 1

[0070]

[0071] It can be seen from the data in Table 3 above that compared with Comparative Example 1, the tensile strength of Examples 1 to 5 of the present invention is greatly improved, indicating that the introduction of MQ silicone resin can effectively improve the mechanical properties of silicone sealant. From the data after aging, the addition of MQ silicone resin can effectively improve the aging resistance of silicone sealant. From the perspective of the curing depth of 2h, the addition of MQ silicone resin can effectively increase the curing rate of silicone sealant. The present invention provides a two-component silicone sealant for photovoltaic modules with relatively low cost, good mechanical properties and high curing rate.

[0072] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A high-strength, fast-curing two-component silicone sealant for photovoltaic modules, characterized in that: The organic silicon sealant is composed of component A and component B in a volume ratio of 1:1, wherein: Component A includes the following raw materials in parts by weight, each raw material is: Component B includes the following raw materials in parts by weight, each raw material is:

2. The high-strength, fast-curing two-component silicone sealant for photovoltaic modules according to claim 1, characterized in that: The α,ω-dihydroxy polydimethylsiloxane in the A component and the B component is a terminal hydroxyl polydimethylsiloxane, and the viscosity at 25° C. is 20000 to 80000 mPa·s.

3. The high-strength, fast-curing two-component silicone sealant for photovoltaic modules according to claim 1, characterized in that: The particle size of the nano calcium carbonate in the A component and the B component is 0.01-200 μm.

4. The high-strength two-component silicone sealant for photovoltaic modules according to any one of claims 1 to 3, characterized in that: The molar ratio of the M group to the Q group in the MQ silicone resin in the A component is 0.6-0.8, and the number average molecular weight is 2000-4000.

5. The high-strength two-component silicone sealant for photovoltaic modules according to any one of claims 1 to 3, characterized in that: The plasticizer in the component A is dimethyl silicone oil, and the viscosity at 25° C. is 100 to 500 mPa·s.

6. The high-strength two-component silicone sealant for photovoltaic modules according to any one of claims 1 to 3, characterized in that: The deep curing agent in the component A is one or more of deionized water, phosphate aqueous solution, and potassium glycerophosphate.

7. The high-strength two-component silicone sealant for photovoltaic modules according to any one of claims 1 to 3, characterized in that: The crosslinking agent in the B component is one or more of methyl tributylacetonato oxime silane, vinyl tributylacetonato oxime silane, methyl triacetone oxime, and dimethyl dibutyl ketone oxime silane.

8. The high-strength two-component silicone sealant for photovoltaic modules according to any one of claims 1 to 3, characterized in that: The silane coupling agent in the B component is one or two of γ-aminopropyltriethoxysilane, methyltriethoxysilane, vinyltriethoxysilane, and aminosilane polymer, and the catalyst includes one or more of dibutyltin dilaurate, dibutyltin dilaurate acetate, dibutyltin diacetate, and dibutyltin bisacetylacetonate.

9. A method for preparing the high-strength fast-curing two-component silicone sealant for photovoltaic modules according to any one of claims 1 to 9, characterized in that: The following steps are involved: According to the formula of the high-strength fast-curing two-component organic silicon sealant for photovoltaic modules according to any one of claims 1 to 9, the raw materials of component A and component B are taken to prepare component A and component B respectively; Preparation of component A: Add α,ω-dihydroxypolydimethylsiloxane, nano calcium carbonate, MQ silicone resin, plasticizer and white slurry in the raw materials of component A into a planetary mixer, heat to 120°C, evacuate to -0.09MPa, stir for 60-120min, cool to room temperature, add deep curing agent, stir for 60-120min, evacuate to -0.09MPa, and discharge to obtain component A; Preparation of component B: Add α,ω-dihydroxypolydimethylsiloxane and nano calcium carbonate in the raw materials of component B into a planetary mixer, heat to 120°C, evacuate to -0.09MPa, stir for 60 to 120 minutes, then add a crosslinking agent and a coupling agent, stir for 30 to 60 minutes, finally add a catalyst, stir for 30 to 60 minutes, and discharge to obtain component B; Preparation of organic silicon sealant: The component A and component B prepared above are mixed in a volume ratio of 1:1 to obtain a high-strength, fast-curing two-component organic silicon sealant for photovoltaic modules.

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