A pre-coated colorant, a colored solder strip and application thereof

Abstract

The application belongs to the technical field of photovoltaic welding strips, and discloses a pre-coated colorant, a colored welding strip and application thereof.The pre-coated colorant disclosed by the application comprises 5-10 parts of rosin resin, 1-2.5 parts of polyamide resin, 1.8-2.7 parts of soldering active agent, 0.5-2 parts of surfactant, 1-5 parts of dyeing agent, 0.5-3 parts of corrosion inhibitor and 50-100 parts of solvent.The pre-coated colorant provided by the application can be attached to the surface of the welding strip, and different colors can be presented according to the color requirement of the welding strip for welding photovoltaic cell pieces, so that the color matching of the welding strip and the photovoltaic cell pieces is realized, the cumbersome steps of conventional film pasting are omitted, a large amount of processing cost is saved, the light receiving area of the cell pieces is completely released, the power generation efficiency of the BIPV assembly is greatly improved, and the blank in the field in China is filled.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of photovoltaic welding strips, and relates to a pre-coated colorant, a colored welding strip and application thereof. BACKGROUND

[0002] BIPV, building integrated photovoltaics, is a very important module of distributed photovoltaic power generation and also a very important branch field in the photovoltaic field. A BIPV component not only needs to play a basic power generation function as a photovoltaic product, but also needs to meet the building standards. Therefore, the appearance requirements of the BIPV component are quite different from those of the conventional component. Because the building appearance is various, the appearance requirements of the BIPV component are also colorful. In order to maintain the aesthetic appearance of the BIPV component, all BIPV components now use film pasting technology to realize color unification. Compared with IBC type components, the BIPV component has electrodes on the positive and negative poles, and therefore the front side will show complete welding strips. Since the welding strips are silver-white, a special color film is needed to cover all the welding strips.

[0003] However, in the actual film pasting process, the film cannot be too narrow, otherwise the film will be displaced due to the flow of EVA after melting in the laminating stage, and the originally covered welding strips will be exposed. Therefore, the film used for covering is often relatively wide, which will lead to a large area of the cell piece power generation area being covered, thereby affecting the power generation power of the cell piece. Under normal circumstances, the overall power of the component after pasting the film is only 70% to 80% of that of the conventional component of the same version, which is one of the biggest problems faced by the BIPV component at present. SUMMARY

[0004] In order to overcome the above technical problems, the application provides a pre-coated colorant and a colored welding strip. The pre-coated colorant can realize the deployment of different colors according to the requirements of the component, and also has a soldering function. When the welding strip covered with the pre-coated colorant is connected, no flux is needed, thereby eliminating the damage of the flux to the colored layer. More importantly, the film pasting step is omitted, and the power of the photovoltaic cell is greatly improved.

[0005] In a first aspect, the application provides a pre-coated colorant, which comprises the following components by weight,

[0006] By adopting the technical scheme, firstly, the pine resin itself has strong viscosity, and it is easy to stick after the solder strip is rolled in the solidification process of coating on the solder strip, thereby local film layer peeling occurs, so other components need to be used for solidification. After a large number of experiments, it is considered that the comprehensive performance of the polyamide resin is the most excellent, the resin has good mutual solubility with the pine resin, and the softening point temperature is slightly higher than that of the pine resin, so in the cooling process, the solid film is formed on the surface of the film layer first, and after complete drying, the polyamide resin is enriched on the surface of the film layer, thereby the surface viscosity is reduced. Secondly, the added dyeing agent can make the pre-coating colorant present various colors according to the requirements of the assembly, so as to meet the requirements of the solder strip for different colors, thereby the film pasting step of the solder strip in the welding process is omitted; thirdly, the added soldering active agent can make the pre-coating colorant also have the function of soldering.

[0007] Further, the pre-coating colorant includes the following components by weight: 5 parts of pine resin, 1 part of polyamide resin, 1.8 parts of soldering active agent, 0.5 part of surfactant, 1 part of dyeing agent, 0.5 part of corrosion inhibitor, and 50 parts of solvent.

[0008] Further, the pre-coating colorant includes the following components by weight: 7.5 parts of pine resin, 2 parts of polyamide resin, 2 parts of soldering active agent, 1 part of surfactant, 3 parts of dyeing agent, 2 parts of corrosion inhibitor, and 80 parts of solvent.

[0009] Further, the pre-coating colorant includes the following components by weight: 10 parts of pine resin, 2.5 parts of polyamide resin, 2.7 parts of soldering active agent, 2 parts of surfactant, 5 parts of dyeing agent, 3 parts of corrosion inhibitor, and 100 parts of solvent.

[0010] By adopting the technical scheme, the weight parts of various components of the pre-coating colorant have certain influence on the coloring degree and welding effect, etc. It is found through experimental exploration that the coloring effect of the pre-coating colorant can be more effectively ensured, the virtual welding rate is effectively reduced, and the welding tension is increased when the weight parts of various components in the pre-coating colorant are controlled within the above range.

[0011] Further, the weight part ratio of the pine resin to the polyamide resin is 4-6:1.

[0012] By adopting the technical scheme, the weight part ratio of the pine resin to the polyamide resin is controlled within the range of 4-6:1, so that the colorant with better anti-stickiness can be obtained.

[0013] Further, the soldering active agent includes organic acid and alcohol amine.

[0014] Further, the weight part ratio of the organic acid to the alcohol amine is 0.2-0.3:1.

[0015] By adopting the technical scheme, since the thermoplastic resin is used as the film-forming material in the pre-coated colorant, if the flux is used in the welding process, the film layer formed by the pre-coated colorant can be washed away by the solvent in the flux, and therefore, the flux cannot be additionally used in the welding process. In order to enable the pre-coated colorant to have the fluxing function, the organic acid and the alcohol amine substance are added as the fluxing active agent, and after the two are compounded, the reliability of the colored solder tape in the welding process can be obviously improved, and the false welding rate of the solder tape is greatly reduced.

[0016] Further, the alcohol amine is selected from one or more of triethanolamine, triisopropanolamine and N,N-dimethyl ethanolamine.

[0017] Further, the alcohol amine is selected from one or more of triethanolamine, triisopropanolamine and N,N-dimethyl ethanolamine.

[0018] By adopting the technical scheme, the triethanolamine, triisopropanolamine and N,N-dimethyl ethanolamine can effectively neutralize the organic acid as the pH buffer to give the pre-coated colorant system a good pH value.

[0019] Further, the organic acid is an organic dibasic acid, and preferably, the organic dibasic acid is selected from one or more of itaconic acid, adipic acid and maleic acid.

[0020] Further, the organic dibasic acid is composed of itaconic acid, adipic acid and maleic acid, and the weight ratio of the itaconic acid, the adipic acid and the maleic acid is 1:2-2.5:1.5-2.

[0021] By adopting the technical scheme, since the colorant of the application is suitable for the solder tape type above 160℃, the preheating temperature of the fluxing active agent is required to be 150-180℃, and the itaconic acid, the adipic acid and the maleic acid are selected, and the active temperatures of the three are all in the range, and the organic acid will not be decomposed to generate a large amount of gas in the welding process, avoiding the phenomenon that the film layer is damaged to cause the discoloration due to the decomposition of the active agent to generate a large amount of gas in the welding process.

[0022] Further, the surfactant is a non-ionic surfactant, and further, the non-ionic surfactant is selected from any one of fatty acid glycerol ester, trans-2,3-dibromo-2-butene-1,4-diol, 3-bromo-1,2-propanediol and 2,3-dibromo-1,4-butanediol.

[0023] By adopting the technical scheme, the non-ionic surfactant can wet the welding material to improve the deoxidation effect of the fluxing active agent, and can also reduce the surface tension of the welding material to improve the welding stability.

[0024] Further, the dyeing agent is an organic dyeing agent or a metal complex dye.

[0025] By adopting the above technical solution, organic dyes or metal complex dyes can be used in the colorant, which can be well compatible with the solvent. These dyes have a wide variety of colors, and the colors can be adjusted as needed during the coloring process to meet the different color requirements of photovoltaic modules and effectively ensure the color consistency with photovoltaic cells.

[0026] Furthermore, the corrosion inhibitor is an imidazole corrosion inhibitor, preferably benzotriazole or 2-phenyl-4,5-dihydroxymethylimidazolium.

[0027] Furthermore, the solvent comprises isopropanol and diethylene glycol monohexyl ether, wherein the weight ratio of isopropanol to diethylene glycol monohexyl ether is 4-8:1-3.

[0028] By adopting the above technical solution, using isopropanol as the main solvent and adding diethylene glycol monohexyl ether as a co-solvent, the solubility of each component in isopropanol is effectively enhanced, and the dispersibility of each component in the solution is improved.

[0029] Secondly, this application also provides a colored solder ribbon, the solder ribbon comprising a solder ribbon substrate and a pre-coated colorant provided in the first aspect of this application covering the surface of the solder ribbon substrate.

[0030] By adopting the above technical solution, colored solder ribbons can be prepared in a color similar to that of the solar cells as needed, and can be directly soldered to the solar cells, maintaining a consistent overall color tone of the module after soldering. Using such colored solder ribbons eliminates the need for film application, saving significant processing costs while fully maximizing the light-receiving area of ​​the solar cells, thus greatly improving the power generation efficiency of BIPV modules.

[0031] Furthermore, the substrate material for the welding strip is in the shape of a circle, a flat shape, a triangle, a trapezoid, etc.

[0032] Thirdly, this application also provides the application of the colored solder ribbon provided in the second aspect in the welding of photovoltaic cells.

[0033] By adopting the above technical solution, during the welding process, since the welding preheating temperature exceeds the softening temperature of both rosin resin and polyamide resin, the film layer does not hinder welding at all. The rosin resin and activator then begin to function, promoting the completion of welding. At the location where the solder ribbon contacts the battery cell, the original film layer is transferred to the gap between the solder ribbon and the battery cell, while the areas not in contact with the battery cell retain their original color. At this time, residual rosin resin and polyamide ester will coat the surface of the solder ribbon, maintaining tight adhesion between the dye and the solder ribbon, and protecting the dye from being transferred by the flowing EVA during subsequent lamination.

[0034] Compared with the prior art, this application has the following technical effects:

[0035] (1) The pre-coated colorant provided in this application is mainly composed of two resins: rosin resin and polyamide resin. Rosin resin has the function of fluxing, but rosin resin itself is very sticky. Polyamide resin is used to compound it, thereby reducing the surface stickiness and not affecting the fluxing function of rosin.

[0036] (2) The pre-coated colorant provided in this application uses thermoplastic resin as the film-forming material. If flux is used during the welding process, the film layer formed by the pre-coated colorant will be washed away by the solvent in the flux. Therefore, no additional flux can be used during the welding process. Meanwhile, to ensure the fluxing function of the pre-coated colorant, a flux activator composed of organic acids and alkanolamines is added. Since the colorant in this application is suitable for solder strips with solder temperatures above 160°C, the activation temperature of the flux activator also needs to be within this range to better exert its fluxing effect. During the welding process of the solder strip, rosin resin and the flux activator work together to promote welding completion, eliminating the need for flux during welding and thus eliminating the destructive effect of flux on the coloring layer.

[0037] (3) The pre-coated colorant provided in this application adds a dye to make it present different colors, which meets the needs of the welding strip for various colors in order to realize photovoltaic building integration, thereby replacing the existing film application technology and greatly saving costs.

[0038] (4) This application also provides a colored solder ribbon with pre-coated colorant attached. The solder ribbon can present different colors according to the needs of photovoltaic modules, realizing the same color between the solder ribbon and the photovoltaic cell. This eliminates the cumbersome steps of conventional film application, saves a lot of processing costs, and also fully releases the light-receiving area of ​​the cell, greatly improving the power generation efficiency of BIPV modules and filling the gap in this field in China. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below.

[0040] Figure 1 The finished colored solder ribbons obtained in Examples 1, 5, and 7.

[0041] Figure 2 This is a schematic diagram showing the relative positions of the solder ribbon coated with pre-coated colorant and the photovoltaic cell before welding.

[0042] Figure 3 This is a schematic diagram showing the relative positions of the solder ribbon coated with pre-coated colorant after welding and the photovoltaic cell.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1-Polyamide resin layer, 2-Rosin resin layer, 3-Kone base layer, 4-Solder layer, 5-Silver paste grid line, 6-Battery cell. Detailed Implementation

[0045] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions, conditions described in a laboratory manual, or conditions recommended by the manufacturer.

[0046] Example 1

[0047] This embodiment provides a pre-coated colorant comprising the following components by weight: 5 kg rosin resin, 2.5 kg polyamide resin, 0.06 kg itaconic acid, 0.12 kg adipic acid, 0.12 kg maleic acid, 1.5 kg triethanolamine, 0.5 kg fatty acid glycerides, 1 kg blue organic dye, 0.5 kg benzotriazole, 40 kg isopropanol, and 10 kg diethylene glycol monohexyl ether.

[0048] The method for preparing the pre-coated colorant provided in this embodiment includes the following steps:

[0049] S1. Place rosin resin in 20 kg of isopropanol, stir for 2 hours, let stand and filter; to obtain solution 1;

[0050] S2. Place the polyamide resin into 10 kg of isopropanol, stir for 2 hours, let stand and filter; to obtain solution 2;

[0051] S3. Add itaconic acid, adipic acid, maleic acid, monoethanolamine, fatty acid glycerides, benzotriazole, and diethylene glycol monohexyl ether to solution 1. Mix and stir for 1 hour, then let stand and filter to obtain solution 3.

[0052] S4. Dissolve the organic dye (if a corresponding dispersant is available) in 5 kg of isopropanol and stir for 30 minutes to disperse it evenly, to obtain dyeing solution 4.

[0053] S5. Pour the filtered solution 2 into solution 1, stir thoroughly, then pour in the filtered solution 3, add the remaining isopropanol, stir for 2 hours, and obtain flux resin 5.

[0054] S6. Add the dissolved dyeing solution 4 to the flux resin 5, stir with an ultrasonic vibrating mixer for 30 minutes, then let stand and filter to obtain a pre-coated colorant with fluxing function.

[0055] All the above steps use a sealed mixer at an ambient temperature of 20°C.

[0056] Example 2

[0057] The difference between Example 2 and Example 1 is that the organic dicarboxylic acid in the flux activator is itaconic acid, with a weight of 0.3 kg, while the weight of the remaining components and the preparation method are the same as in Example 1.

[0058] Example 3

[0059] The difference between Example 3 and Example 1 is that the organic dicarboxylic acid in the flux activator is adipic acid, with a weight of 0.3 kg, while the weight of the remaining components and the preparation method are the same as in Example 1.

[0060] Example 4

[0061] The difference between Example 4 and Example 1 is that the organic dicarboxylic acid in the flux activator is maleic acid, with a weight of 0.3 kg, while the weight of the remaining components and the preparation method are the same as in Example 1.

[0062] Example 5

[0063] The difference between Example 5 and Example 1 is that the alcohol amine in the flux activator is triethanolamine, weighing 1.5 kg, and the blue organic dye is replaced with a green organic dye. The weights of the remaining components and the preparation methods are the same as in Example 1.

[0064] Example 6

[0065] The difference between Example 6 and Example 1 is that the alcohol amines in the flux activator are...

[0066] N,N-dimethylethanolamine, weighing 1.5 kg, with the weights of the remaining components and the preparation method being the same as in Example 1.

[0067] Example 7

[0068] The difference between Example 7 and Example 1 is that the blue organic dye is replaced with...

[0069] The dye is a gold organic dye, the corrosion inhibitor is 2-phenyl-4-5-methylimidazole, the weight is 2.5 kg, and the weight and preparation method of the other components are the same as in Example 1.

[0070] Comparative Example

[0071] Comparative Example 1

[0072] The difference between Comparative Example 1 and Example 1 is that the amount of rosin resin used is 2.5 kg, while the rest is the same as Example 1.

[0073] Comparative Example 2

[0074] The difference between Comparative Example 2 and Example 1 is that the amount of rosin resin used is 30 kg, while the rest is the same as in Example 1.

[0075] Comparative Example 3

[0076] The difference between Comparative Example 3 and Example 1 is that the amount of polyamide resin used is 0.3 kg, while the rest is the same as Example 1.

[0077] Comparative Example 4

[0078] The difference between Comparative Example 4 and Example 1 is that the amount of polyamide resin used is 3 kg, while the rest is the same as Example 1.

[0079] Comparative Example 5

[0080] The difference between Comparative Example 5 and Example 1 is that no flux activator was added; otherwise, they are the same as Example 1.

[0081] Comparative Example 6

[0082] The difference between Comparative Example 6 and Example 1 is that the amount of each component of the flux activator is halved, namely itaconic acid 0.03 kg, adipic acid 0.06 kg, maleic acid 0.06 kg, and triethanolamine 0.75 kg, while the rest is the same as in Example 1.

[0083] Comparative Example 7

[0084] The difference between Comparative Example 7 and Example 1 is that the amount of each component of the flux activator is doubled, namely itaconic acid 0.12 kg, adipic acid 0.24 kg, maleic acid 0.24 kg, and triethanolamine 3 kg, while the rest is the same as in Example 1.

[0085] Comparative Example 8

[0086] The difference between Comparative Example 8 and Example 1 is that the amount of colored dye used is 0.5 kg, while the rest is the same as Example 1.

[0087] The difference between Comparative Example 9 and Example 1 is that the amount of colored dye used is 6 kg, while the rest is the same as Example 1.

[0088] Application Example 1-16

[0089] The pre-coated colorants obtained in Examples 1-7 and Comparative Examples 1-9 were coated onto Sn60Pb40 photovoltaic ribbons using the following method, with specific steps as follows.

[0090] S1. After the photovoltaic welding ribbon undergoes special surface roughening treatment, the prepared dyeing flux is applied to the surface of the welding ribbon using methods commonly used in the field, such as spraying, dipping, rolling, and printing.

[0091] S2. Place the solder strip obtained in S1 at 160°C and dry for 5 minutes to allow the pre-coated colorant to form a coloring film layer on the surface of the solder strip.

[0092] S3. Apply micro-wax powder to the surface of the solder strip to reduce resin viscosity and prevent reverse sticking.

[0093] S4. Rewind and place in a 50℃ drying room for 24 hours to obtain the finished colored welding strip.

[0094] Exemplary examples 1, 5, and 7 show the finished colored solder ribbons obtained as follows: Figure 1 As shown.

[0095] Example of effect

[0096] The finished colored solder ribbons prepared in Application Examples 1-16 are soldered to the solar cells at the module end, such as... Figure 2 The diagram shows the relative positions of the colored solder ribbon and the photovoltaic cell before welding. Then, a stringer is used to weld the photovoltaic panel with the solder ribbon at 220±5℃ for 2±0.5s, resulting in a panel with the solder ribbon welded on. Figure 3 As shown, the colorant on the solder strip after welding is compatible with the silver paste grid line 5 due to its fluxing function, and the color layer film that does not contact the silver paste grid line has integrity and maintains color consistency with the photovoltaic cell.

[0097] The solder ribbon was heated using a soldering iron at a set temperature, and its heat resistance was determined by observing the fading of the solder ribbon. The cold solder joint rate of the welded battery cell assembly was measured using an EL detector. The average power of the welded battery cell assembly was tested. A string welding machine was used for welding, followed by a welding tensile testing machine to test the welding force. Simultaneously, the thickness of the colorant film formed was measured. The test results are shown in Table 1.

[0098] Table 1 Test results of various performance indicators of the welding strip

[0099]

[0100]

[0101] As can be seen from the results of Application Examples 1-7, the colored solder ribbon prepared using this application has an average heat resistance temperature of 257.8℃, and its poor soldering rate is below 0.4%. In particular, the average power output remains above 600W. Generally, solder ribbons are coated with a film to ensure color consistency with the photovoltaic cells. However, since the photovoltaic cells are often shaded, their average power output is typically around 500W. Using the colored solder ribbon of this application eliminates the cumbersome step of conventional film coating and fully releases the light-receiving area of ​​the cells, significantly improving the power generation efficiency of BIPV modules. Simultaneously, the welding tensile strength of the prepared colored solder ribbon can reach 2.6 N / mm. 2 The film thickness can reach 5.7 μm or more. Therefore, the colorant and colored solder ribbon of this application can significantly improve the average power of photovoltaic cells while maintaining their overall performance.

[0102] As can be seen from the results of Application Examples 1 and 2-4, in Application Examples 2-4, the organic dicarboxylic acid in the flux activator was combined with an alcohol amine, resulting in a decrease in its performance in all aspects. Therefore, although itaconic acid, adipic acid, and maleic acid can be used in the flux activator to improve the average power of photovoltaic cells, it is not the optimal method. In this application, itaconic acid, adipic acid, and maleic acid are combined in a specific ratio to prepare the colorant, which allows the flux to fully perform its function and reduces its poor soldering rate.

[0103] The results from Application Examples 1 and 8-9 show that the failure rate in Application Example 8 increased significantly, while the average power and welding pull strength decreased significantly. Rosin resin is the main material for forming the coloring film of the pre-coated colorant. In Application Example 8, the amount of rosin resin was reduced, resulting in poor film-forming properties of the pre-coated colorant, directly affecting the welding effect of the solder strip. Furthermore, the thickness of the coloring film was only 2.3 μm, meaning the colorant could not completely cover the base color of the solder strip. Conversely, in Application Example 9, the amount of rosin resin was increased, resulting in an excessively thick coloring film that was difficult to dry, leading to back-adhesion and peeling, further reducing the welding pull strength to only 1.9 N / mm. 2 Therefore, the amount of rosin resin used must be within the range specified in this application to better achieve its effect and form a stable colored film layer.

[0104] The results from Application Examples 1 and 10-11 show that the heat resistance of the solder ribbon in Application Example 10 is significantly reduced. The role of the polyamide resin is to enhance the curing effect of the rosin resin. Due to the reduced amount of polyamide resin, the film formed by the colorant has high viscosity and low hardness, and its heat resistance temperature is also significantly reduced. In Application Example 11, the increased amount of polyamide resin leads to poorer dispersibility in the system, resulting in an uneven film layer and a significant reduction in welding tensile strength. Therefore, the amount of polyamide resin within the range set in this application can effectively cooperate with the rosin resin to ensure the curing effect of the coloring film and form a coloring film with suitable viscosity and a smooth appearance on the surface of the solder ribbon.

[0105] As can be seen from the results of Application Examples 1 and 12-14, because the pre-coated colorant uses a thermoplastic film-forming system, the film layer formed by the pre-coated colorant will be washed away by the solvent in the flux, and no additional flux can be used during the soldering process. In Application Example 12, no other flux components were used, yet the solder joint failure rate was as high as 72%, making soldering impossible. The soldering pull force was also very low, only 0.2 N / mm. 2 Although a small amount of flux activator was added in Application Example 13, the amount was too small, resulting in a very low weld strength and a high rate of incomplete welds (up to 5.8%). Simultaneously, the average power of the photovoltaic cell was only 545.34 W, and the weld strength was only 0.8 N / mm. 2In contrast, the amount of flux activator used in Application Example 14 was doubled, but due to the excessive amount, a large amount of flux residue appeared during the welding process, and a lot of gel clusters were precipitated, which also led to a decrease in its heat resistance and a decrease in welding tensile strength.

[0106] As can be seen from the results of Application Example 1 and Application Examples 15-16, the amount of dye added in Application Example 15 was too low, resulting in a light color and poor coloring of the coating film on the surface of the solder ribbon, which could not completely cover the silvery-white color of the solder ribbon itself. Conversely, the amount of dye added in Application Example 16, although it could make the solder ribbon present a high purity appearance color, resulted in poor dispersion of the dye in the resin material of the colorant, making it difficult to dry. The resulting colored film layer was unstable and easily faded during high-temperature processing, which significantly affected the appearance of the solder ribbon.

[0107] In summary, the pre-coated colorant of this application can fully exert its effects among its various components when used within a suitable dosage range. This allows the pre-coated colorant to not only have a coloring function but also to act as a flux. Without the addition of additional flux, it can make the solder ribbon present different colors and ensure the strength of the weld, thereby avoiding the need to cover the photovoltaic cells with a film and greatly improving the power generation of the photovoltaic cells.

[0108] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A pre-coated colorant, characterized in that, The pre-coated colorant comprises the following components in parts by weight: 5-10 parts of rosin resin 1-2.5 parts of polyamide resin 1.8-2.7 parts of flux activator Surfactant 0.5-2 parts 1-5 parts of dye Corrosion inhibitor 0.5-3 parts Solvent 50-100 parts; The fluxing agent comprises organic acids and alkanolamines, wherein the weight ratio of the organic acid to the alkanolamine is 0.2-0.3:1, and the organic acid is composed of itaconic acid, adipic acid and maleic acid, wherein the weight ratio of itaconic acid, adipic acid and maleic acid is 1:2-2.5:1.5-2. The dye is an organic dye or a metal complex dye.

2. The pre-coated colorant according to claim 1, characterized in that, The surfactant is a nonionic surfactant.

3. The pre-coated colorant according to claim 2, wherein the nonionic surfactant is any one of fatty acid glycerides, trans-2,3-dibromo-2-buten-1,4-diol, 3-bromo-1,2-propanediol, and 2,3-dibromo-1,4-butanediol.

4. The pre-coated colorant according to claim 1, characterized in that, The corrosion inhibitor is an imidazole-based corrosion inhibitor.

5. The pre-coated colorant according to claim 4, characterized in that, The imidazole corrosion inhibitor is benzotriazole or 2-phenyl-4,5-dihydroxymethylimidazolium.

6. The pre-coated colorant according to claim 1, characterized in that, The solvent includes isopropanol and diethylene glycol monohexyl ether, wherein the weight ratio of isopropanol to diethylene glycol monohexyl ether is 4-8:1-3.

7. A colored solder ribbon with fluxing function, characterized in that, The colored solder ribbon includes a solder ribbon substrate and a pre-coated colorant as described in any one of claims 1-6 covering the surface of the solder ribbon substrate.

8. The application of the colored solder ribbon as described in claim 7 in the welding of photovoltaic cells.

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