High-reliability photovoltaic 0BB dispensing glue and preparation method thereof

Abstract

The invention provides high-reliability photovoltaic OBB dispensing glue and a preparation method thereof. The high-reliability photovoltaic OBB dispensing glue specifically comprises glue consisting of 2D resin modified acrylate resin, an anti-yellowing acrylate monomer and a photoinitiator. 2D resin modified hydroxyethyl acrylate is added into the glue, so that the adhesive force, the water resistance and the chemical resistance of the glue are effectively improved; by introducing the yellowing-resistant acrylate monomer, the yellowing resistance and the comprehensive performance of the glue are enhanced; meanwhile, due to the optimal proportion of the photoinitiator, the curing rate of the glue is remarkably increased. The prepared photovoltaic OBB dispensing glue has the characteristics of high solid content, high stability, good weather resistance, excellent mechanical properties and the like, is particularly suitable for packaging application of photovoltaic modules, can keep excellent properties in a harsh environment, and meets environmental protection requirements.

Description

Technical Field

[0001] The invention relates to the field of preparation of photovoltaic dispensing glue, and more specifically to high-reliability photovoltaic OBB dispensing glue and a preparation method thereof. Background Art

[0002] With the continuous development and iteration of photovoltaic technology, TOPCon solar cells are gradually becoming the mainstream choice in the market. TOPCon cells are widely used in the field of photovoltaic power generation due to their high efficiency and excellent cost-effectiveness. In the application of TOPCon cell technology, 0BB (zero main grid) technology has gradually become one of the mainstream technologies in the industry because it can effectively reduce the shading of the cell surface and improve the light absorption efficiency, thereby significantly improving the overall power generation efficiency of photovoltaic modules.

[0003] At present, there are three main ways to implement the packaging and welding of 0BB cells, namely: coating technology, dispensing technology, and a technical solution combining dispensing and welding. Among them, the dispensing process has been widely used in 0BB technology packaging due to its advantages of simple operation and high efficiency. In particular, the use of UV light-curing glue for packaging can not only complete the curing in a short time and significantly improve production efficiency, but also has the advantages of low energy consumption, environmental protection, and low VOCs emissions. In addition, UV curing glue is easy to achieve large-scale industrial production and is suitable for the efficient manufacturing needs of the photovoltaic industry.

[0004] However, existing UV light-curing glues face some technical challenges when used in 0BB packaging. Traditional UV glues are prone to problems such as insufficient yellowing resistance and small molecule migration during long-term use, which affect the stability and reliability of the packaging. In order to meet the high requirements of the 0BB packaging process, the glue not only needs to have excellent yellowing resistance, but also needs to maintain strong adhesion, water resistance, acid and alkali resistance, solvent resistance and thermal stability under various complex environments. Therefore, the development of a highly reliable UV-curing packaging glue to meet the long-term stability requirements of photovoltaic modules has become a key technical issue in the current industry. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention proposes a novel high-reliability photovoltaic 0BB dispensing glue and a preparation method thereof, aiming to provide a UV curing glue with excellent weather resistance, chemical corrosion resistance and long-term thermal stability, providing a strong guarantee for the efficient and stable operation of photovoltaic modules. The specific scheme is as follows:

[0006] A high-reliability photovoltaic OBB dispensing glue, the OBB dispensing glue comprises the following components in parts by weight: 70-80 parts of 2D resin-modified acrylate resin, 10-20 parts of yellowing-resistant acrylate monomer, and 3-5 parts of photoinitiator; the 2D resin-modified acrylate resin comprises specific 2D resin, hydroxyethyl acrylate, sodium dodecyl sulfonate, p-toluenesulfonic acid, and hydroquinone; the specific 2D resin is a polyhydroxyl group resin product synthesized from glyoxal, urea, and NaOH.

[0007] Furthermore, the preparation method of the specific 2D resin comprises the following steps:

[0008] S1: Using NaOH, the pH value of 1.6 molar glyoxal solution was adjusted to weak acidity;

[0009] S2: Pour the raw material treated in S1 into a three-necked flask with a thermometer, weigh out 1 mol of urea, and add 2 / 3 of the total urea mass into the three-necked flask;

[0010] S3: Place the prepared solution in a constant temperature water bath and heat it to 75°C. After reacting for 2 hours, add the remaining 1 / 3 of the urea into a three-necked flask and continue to heat the reaction in a water bath;

[0011] S4: When the viscosity of the product reaches a certain standard, stop heating, adjust to neutral and cool to 30℃ before discharging.

[0012] Furthermore, the preparation method of the 2D resin modified acrylic resin is to use 2D resin as a soft segment polyol or a chain extender to modify hydroxyethyl acrylate, and the specific steps are as follows:

[0013] S1: Add 2 mol of a specific 2D resin into a four-necked flask, add 0.1% of the total mass of hydroquinone, 0.6% of the total mass of p-toluenesulfonic acid, and 5% of the total mass of sodium dodecyl sulfate;

[0014] S2: When the system temperature rises to 60°C, weigh 1 mol of hydroxyethyl acrylate, add hydroxyethyl acrylate dropwise, and control the addition rate to complete the addition within 0.5 h;

[0015] S3: Stir until the prepolymer viscosity reaches 103mm 2 / s, and then the temperature is lowered to stop the reaction, and the prepolymer preparation is completed and stored in a light-proof bottle to obtain a 2D resin-modified acrylate resin.

[0016] Furthermore, the yellowing-resistant acrylic ester monomer is a mixture of isobornyl acrylate, lauryl acrylate and tetrahydrofuran acrylate.

[0017] Furthermore, the photoinitiator is benzoin ethyl ether and 2-hydroxy-2-methyl-1-phenylpropanone; the mass ratio of benzoin ethyl ether to 2-hydroxy-2-methyl-1-phenylpropanone is 1:1.

[0018] Furthermore, the pH in S1 is adjusted to 6-7.

[0019] Furthermore, the viscosity of the product in S4 is 12.99-25.97 mm 2 / s stops.

[0020] A method for preparing high-reliability photovoltaic OBB dispensing glue, the preparation method comprising the following steps:

[0021] S1: weigh 70-80 parts of 2D resin modified acrylate resin, 10-20 parts of yellowing resistant acrylate monomer, and 3-5 parts of photoinitiator;

[0022] S2: Add the materials weighed in S1 into a constant temperature heated magnetic stirrer in sequence, evacuate to a vacuum degree of 0.08 MPa, set the speed to 800-1000 rpm, and stir for 0.5-2 hours;

[0023] S3: After stirring evenly, cool down to room temperature naturally, seal and store away from light.

[0024] Beneficial effects:

[0025] The present invention provides a high-reliability photovoltaic OBB dispensing glue and a preparation method thereof, which has the following advantages:

[0026] (1) By adding 2D resin-modified hydroxyethyl acrylate to UV curing adhesive, the adhesive's adhesion, water resistance and chemical resistance are effectively enhanced. The introduction of this modified resin structure not only improves the mechanical properties of conventional acrylates, but also significantly improves the stability of UV curing adhesives under various harsh conditions, making it exhibit excellent acid resistance, solvent resistance and thermal stability in photovoltaic 0BB packaging applications.

[0027] (2) The addition of specific anti-yellowing acrylic monomers, including isobornyl acrylate, lauryl acrylate, and tetrahydrofuran acrylate, significantly improves the yellowing resistance and overall performance of the glue. The introduction of these monomers can increase the carbon-carbon double bond density in the polymer and enhance the cross-linking degree of the UV curing reaction, so that the glue still maintains excellent transparency and physical properties after long-term use, thereby meeting the durability requirements of high-reliability photovoltaic applications.

[0028] (3) The present invention significantly improves the curing rate of UV curing adhesive by accurately proportioning and selecting different types and amounts of photoinitiators including benzoin ethyl ether and 2-hydroxy-2-methyl-1-phenylpropanone. This photoinitiator combination can not only ensure that the glue cures quickly under UV light, but also maintain the mechanical properties and durability of the glue after curing, thereby improving production efficiency, reducing processing costs, and meeting the rapid curing requirements of photovoltaic OBB packaging.

[0029] (4) The high solid content and high stability polymer resin designed by the present invention does not contain volatile organic compounds (VOCs), which meets the environmental protection requirements of green and low carbon. The UV curing adhesive system is evenly dispersed, has good storage stability, is suitable for long-term storage, and is not prone to performance degradation. The use of this environmentally friendly raw material makes the photovoltaic OBB encapsulation adhesive of the present invention not only meet the high-standard photovoltaic application requirements in performance, but also take into account the requirements of ecological environmental protection.

[0030] (5) The encapsulant of the present invention still exhibits excellent yellowing resistance and adhesion after testing. By adding specific functional acrylate monomers and photoinitiators, the UV curing reaction is sufficient and uniform, ensuring that the mechanical properties and chemical stability of the encapsulant are greatly improved, which can meet the extremely high requirements of high-reliability photovoltaic modules for encapsulation materials.

[0031] In summary, the high-reliability photovoltaic OBB dispensing glue of the present invention has excellent adhesion, water resistance, acid resistance, solvent resistance and thermal stability, which can not only improve production efficiency, but also conform to the development trend of environmental protection and low carbon, and is a high-performance UV-curing packaging material with broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is the reaction route of a specific 2D resin.

[0033] Figure 2 It is the reaction route of 2D resin modified acrylate resin.

[0034] Figure 3 It is a process flow chart for preparing high-reliability photovoltaic OBB dispensing glue. DETAILED DESCRIPTION

[0035] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0036] This embodiment provides a method for preparing high-reliability photovoltaic OBB dispensing glue, the steps of which include preparing a specific 2D resin, preparing a 2D resin-modified acrylate resin, and preparing glue. Figure 1 It is the reaction route of a specific 2D resin; Figure 2 It is the reaction route of 2D resin modified acrylate resin; Figure 3 This is a process flow chart for preparing high-reliability photovoltaic OBB dispensing glue, and the specific embodiments are as follows:

[0037] Embodiment 1:

[0038] A method for preparing high-reliability photovoltaic OBB dispensing glue comprises the following steps:

[0039] (1) Preparation of specific 2D resins:

[0040] The pH value of 1.6 mol glyoxal was adjusted to 6-7 using NaOH solution to maintain the weakly acidic environment of the solution.

[0041] Pour the treated glyoxal solution into a three-necked flask with a thermometer.

[0042] Weigh 1 mol of urea and add 2 / 3 of the total urea mass to the glyoxal solution.

[0043] The flask was placed in a 75°C constant temperature water bath and reacted for 2 hours.

[0044] After reacting for 2 hours, the remaining 1 / 3 of urea was added and the heating reaction was continued.

[0045] When the solution viscosity reaches 12.99~25.97mm 2 / s, stop heating, adjust the solution pH to neutral, and cool to 30°C to obtain the final 2D resin product.

[0046] (2) Preparation of 2D resin modified acrylate resin:

[0047] 2 mol of a specific 2D resin was placed in a four-necked flask, and 0.1% of hydroquinone, 0.6% of p-toluenesulfonic acid and 5% of sodium dodecyl sulfate were added to the total weight.

[0048] When heated to 60° C., 1 mol of hydroxyethyl acrylate was weighed and the dropping speed was controlled to complete the addition of hydroxyethyl acrylate within 0.5 hours.

[0049] Stir until the prepolymer viscosity reaches 103mm 2 / s, stop the reaction, cool down and store the prepolymer in a light-proof bottle to obtain 2D resin-modified acrylate resin.

[0050] (3) Glue preparation:

[0051] Weigh 75 parts of 2D resin-modified acrylate resin, 15 parts of yellowing-resistant acrylate monomer, and 4 parts of photoinitiator.

[0052] All materials were added into a constant temperature heating magnetic stirrer in sequence, the vacuum degree was set to 0.08 MPa, the stirring speed was 900 rpm, and stirring was continued for 1 hour.

[0053] After stirring, cool naturally to room temperature, seal and store away from light to obtain the final high-reliability photovoltaic OBB dispensing glue.

[0054] Embodiment 2:

[0055] A method for preparing high-reliability photovoltaic OBB dispensing glue comprises the following steps:

[0056] (1) Preparation of 2D resin:

[0057] The 2D resin was prepared by the same method as in Example 1, the pH was adjusted to 6.5, urea was added twice and the reaction temperature was controlled to 75°C, the reaction time was maintained for 2.5 hours, and the viscosity reached 15 mm 2 / s, stop heating and cool to 30°C to obtain the final 2D resin.

[0058] (2) Preparation of 2D resin modified acrylate resin:

[0059] In a four-necked flask, 2 mol of a specific 2D resin, 0.1% of hydroquinone, 0.5% of p-toluenesulfonic acid and 5% of sodium dodecyl sulfate were added.

[0060] The mixture was heated to 60°C and 1 mol of hydroxyethyl acrylate was added dropwise over 0.5 hours.

[0061] Stir until the viscosity reaches 103mm 2 / s, stop the reaction and store in a light-proof bottle.

[0062] Mix 10 parts of isobornyl acrylate, 5 parts of lauryl acrylate and 5 parts of tetrahydrofuran acrylate.

[0063] After stirring thoroughly, seal and store away from light for later use.

[0064] (3) Glue preparation:

[0065] Accurately weigh the following raw materials: 2D resin modified acrylate resin, 75g; IBOA, 10g; LA, 5g; THFA, 5g; photoinitiator benzoin ethyl ether, 2g; photoinitiator Irgacure1173, 2g; add the above materials into a constant temperature heating magnetic stirrer in turn, evacuate to a vacuum degree of -0.08MPa, stir at 800 rpm for 2 hours, stir evenly, and then naturally cool to room temperature to obtain packaging glue for photovoltaic 0BB technology, which can be sealed and stored away from light.

[0066] Embodiment 3:

[0067] A method for preparing high-reliability photovoltaic OBB dispensing glue comprises the following steps:

[0068] (1) Preparation of 2D resin:

[0069] The 2D resin was prepared by the method in Example 1. The pH value of the glyoxal solution was adjusted to 6.8, and urea was added in batches. The reaction temperature was maintained at 75°C, the reaction time was controlled to 2 hours, and the viscosity reached 20 mm 2 / s, stop heating and cool to 30℃.

[0070] (2) Preparation of 2D resin modified acrylate resin:

[0071] Add the same proportion of additives as in Example 1, heat to 60°C, and dropwise add hydroxyethyl acrylate within 0.5 hours until the viscosity reaches 100 mm 2 / s to stop the reaction and store away from light.

[0072] Mix benzoin ethyl ether and 2-hydroxy-2-methyl-1-phenylacetone in a mass ratio of 1:1, stir thoroughly, and seal to store away from light.

[0073] (3) Glue preparation:

[0074] Weigh 75 parts of 2D resin-modified acrylate resin, 10 parts of yellowing-resistant acrylate monomer, and 5 parts of photoinitiator.

[0075] The materials were added into the stirrer, the vacuum degree was set to 0.08 MPa, the stirring speed was 1000 rpm, and the stirring time was 2 hours.

[0076] After cooling to room temperature, the mixture is sealed and stored away from light to obtain an optimized photovoltaic OBB dispensing glue with high light-triggered efficiency.

[0077] The glue obtained in Example 2 was tested, and the test results were as follows:

[0078] The UV curing glue prepared through the above steps has a light curing time of only 52s; it can pass the yellowing resistance test at 200℃, 5H; the adhesion level can reach level 0; after water resistance and chemical resistance tests, there is no loss of gloss, discoloration, wrinkling, blistering or cracking, and it has good stability and reliability.

[0079] As a further improvement, the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high reliability photovoltaic OBB dispensing glue, characterized in that: The OBB dispensing glue comprises the following components in parts by weight: 70 to 80 parts of 2D resin-modified acrylate resin, 10 to 20 parts of yellowing-resistant acrylate monomer, and 3 to 5 parts of photoinitiator; the 2D resin-modified acrylate resin comprises specific 2D resin, hydroxyethyl acrylate, sodium dodecyl sulfonate, p-toluenesulfonic acid, and hydroquinone; the specific 2D resin is a polyhydroxyl group resin product synthesized from glyoxal, urea, and NaOH.

2. A high reliability photovoltaic OBB dispensing glue according to claim 1, characterized in that: The method for preparing the specific 2D resin comprises the following steps: S1: Using NaOH, the pH value of 1.6 molar glyoxal solution was adjusted to weak acidity; S2: Pour the raw material treated in S1 into a three-necked flask with a thermometer, weigh out 1 mol of urea, and add 2 / 3 of the total urea mass into the three-necked flask; S3: Place the prepared solution in a constant temperature water bath and heat it to 75°C. After reacting for 2 hours, add the remaining 1 / 3 of the urea into a three-necked flask and continue to heat the reaction in a water bath; S4: When the viscosity of the product reaches a certain standard, stop heating, adjust to neutral and cool to 30℃ before discharging.

3. A high reliability photovoltaic OBB dispensing glue according to claim 1, characterized in that: The preparation method of the 2D resin-modified acrylate resin is as follows: S1: Add 2 mol of a specific 2D resin into a four-necked flask, add 0.1% of the total mass of hydroquinone, 0.6% of the total mass of p-toluenesulfonic acid, and 5% of the total mass of sodium dodecyl sulfate; S2: When the system temperature rises to 60°C, weigh 1 mol of hydroxyethyl acrylate, add hydroxyethyl acrylate dropwise, and control the addition rate to complete the addition within 0.5 h; S3: Stir until the prepolymer viscosity reaches 103mm 2 / s, and then the temperature is lowered to stop the reaction, and the prepolymer preparation is completed and stored in a light-proof bottle to obtain a 2D resin-modified acrylate resin.

4. A high reliability photovoltaic OBB dispensing glue according to claim 1, characterized in that: The yellowing-resistant acrylic ester monomer is a mixture of isobornyl acrylate, lauryl acrylate and tetrahydrofuran acrylate.

5. A high reliability photovoltaic OBB dispensing glue according to claim 1, characterized in that: The photoinitiator is benzoin ethyl ether and 2-hydroxy-2-methyl-1-phenylacetone; the mass ratio of benzoin ethyl ether to 2-hydroxy-2-methyl-1-phenylacetone is 1:

1.

6. A high reliability photovoltaic OBB dispensing glue according to claim 2, characterized in that: The pH in S1 was adjusted to 6-7.

7. A high reliability photovoltaic OBB dispensing glue according to claim 2, characterized in that: The viscosity of the product in S4 is 12.99~25.97mm 2 / s stops.

8. A method for preparing high-reliability photovoltaic OBB dispensing glue, characterized in that: The preparation method comprises the following steps: S1: weigh 70-80 parts of 2D resin modified acrylate resin, 10-20 parts of yellowing resistant acrylate monomer, and 3-5 parts of photoinitiator; S2: Add the materials weighed in S1 into a constant temperature heated magnetic stirrer in sequence, evacuate to a vacuum degree of 0.08 MPa, set the speed to 800-1000 rpm, and stir for 0.5-2 hours; S3: After stirring evenly, cool down to room temperature naturally, seal and store away from light.

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