Coloring process for solar photovoltaic welding strip

Abstract

The invention discloses a solar photovoltaic welding strip coloring process, and relates to the technical field, and the solar photovoltaic welding strip coloring process comprises the following steps: preparing: selecting a coloring agent, and preparing into coloring slurry; cleaning: cleaning the surface of the photovoltaic welding strip to remove oil stains and oxides on the surface; spraying: spraying the coloring slurry on the surface of the photovoltaic welding strip through spraying equipment; and curing: putting the sprayed photovoltaic welding strip into a curing oven to obtain a welding strip finished product. By using the coloring agent, the method not only is environment-friendly, but also has good weather resistance and color stability. Biodegradable materials such as a blueberry extract, a carrot extract and a turmeric extract and natural minerals such as hematite, pyrite and chlorite are not easy to degrade in the natural environment, and the color brightness can be kept for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of welding strips, in particular to a solar photovoltaic welding strip coloring process. Background Art

[0002] As the global demand for renewable energy grows, solar photovoltaic power generation has been widely used as a clean and efficient form of energy. The soldering ribbon in the photovoltaic module is a key component for connecting the cells, and its performance directly affects the power generation efficiency and service life of the photovoltaic module. Traditional photovoltaic soldering ribbons are mostly silver-white or black, with a single appearance, which cannot meet the market's demand for beauty and diversity. In addition, traditional soldering ribbons are easily affected by environmental factors such as ultraviolet rays, humidity, temperature changes, etc. during long-term outdoor use, resulting in fading and peeling of the soldering ribbon surface, affecting the appearance and performance of the photovoltaic module. Summary of the invention

[0003] In view of the problems existing in the coloring of the existing solar photovoltaic welding strips, the present invention is proposed.

[0004] Therefore, the problem to be solved by the present invention is that the traditional photovoltaic welding strip is easily affected by environmental factors during long-term outdoor use, resulting in fading, peeling and other problems on the surface of the welding strip.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a solar photovoltaic welding strip coloring process, which comprises the following steps:

[0007] Preparation: Select colorant and make it into coloring slurry;

[0008] Cleaning: Clean the surface of the photovoltaic ribbon to remove oil and oxides on the surface;

[0009] Spraying: Spray the coloring slurry onto the surface of the photovoltaic ribbon through the spraying equipment;

[0010] Curing: Place the sprayed photovoltaic ribbon into a curing furnace to obtain the finished ribbon.

[0011] As a preferred solution of the solar photovoltaic welding belt coloring process of the present invention, wherein: the colorant comprises one or more of pigments extracted from plants and natural mineral powders;

[0012] The plant-extracted pigment is selected from one or more of blueberry extract, carrot extract, and turmeric extract;

[0013] The natural mineral powder is selected from one or more of hematite, pyrite and chlorite.

[0014] As a preferred solution of the solar photovoltaic welding strip coloring process of the present invention, the coloring slurry has the following raw material components in weight ratio:

[0015] Colorant: 80-90 parts;

[0016] Antioxidant: 0.5-1 part;

[0017] Photoprotectant: 0.5-1 part;

[0018] Brightener: 1 to 3 parts;

[0019] Stabilizer: 0.8-4.5 parts.

[0020] As a preferred solution of the solar photovoltaic welding strip coloring process described in the present invention, the brightener is a mixture of one or more of cyclohexyl benzoimidazoline quaternary ammonium salt substances, cyclohexyl imidazole compounds or aromatic imidazole salt substances.

[0021] As a preferred solution of the solar photovoltaic welding strip coloring process of the present invention, the stabilizer is a mixture of one or more of nano silicon dioxide or nano aluminum oxide;

[0022] The particle size of the stabilizer is 10-100 nanometers;

[0023] The ratio of the stabilizer to the colorant is 1 to 5:100.

[0024] As a preferred solution of the solar photovoltaic welding strip coloring process of the present invention, wherein: the antioxidant is selected from one or more of vitamin C, vitamin E, and BHT;

[0025] The light protectant is selected from one or more of the ultraviolet absorber UV-531 and the hindered amine light protectant HALS.

[0026] As a preferred solution of the solar photovoltaic welding belt coloring process of the present invention, wherein: the colorant also includes a dispersant and an anti-settling agent;

[0027] The dispersant is selected from one or more of sodium polyacrylate and polyvinyl alcohol, and the added amount is 0.5% to 2% of the weight of the colorant;

[0028] The anti-settling agent is selected from one or more of fumed silica and hydrogenated castor oil, and the added amount is 0.1% to 1% of the weight of the colorant.

[0029] As a preferred solution of the solar photovoltaic welding strip coloring process of the present invention, when the surface of the photovoltaic welding strip is cleaned, an ultrasonic cleaning machine is used to clean it at a frequency of 40-60kHz, wherein the cleaning time is: 10 to 20 minutes;

[0030] During the spraying process, the nozzle diameter of the spraying equipment used is 0.2-0.5 mm, the spraying pressure is 0.2-0.5 MPa, and the spraying speed is 0.5-1.0 m / min.

[0031] As a preferred solution of the solar photovoltaic welding strip coloring process of the present invention, the preparation steps of the coloring slurry include:

[0032] The colorant and the stabilizer are mixed in proportion, deionized water is added, and the mixture is stirred with a stirrer, wherein the speed of the stirrer is 1000 to 3000 rpm for 10 to 30 minutes;

[0033] Add antioxidant and light protectant and continue stirring for 5 to 10 minutes;

[0034] Finally, add the brightener and set the mixer speed to 1000-1500 rpm for 10-15 minutes;

[0035] Filter the stirred mixture through a 200-400 mesh filter;

[0036] The solid content and pH value of the coloring slurry are set, and the solid content and pH value of the obtained coloring slurry are at the set values.

[0037] As a preferred solution of the solar photovoltaic welding strip coloring process described in the present invention, the solid content of the coloring slurry is 20% to 40%, and the pH value of the coloring slurry is 6.0 to 8.0.

[0038] The beneficial effects of the present invention are:

[0039] The use of colorants is not only environmentally friendly, but also has good weather resistance and color stability. Biodegradable materials such as blueberry extract, carrot extract, turmeric extract, etc., natural minerals such as hematite, pyrite, chlorite, etc., these materials are not easy to degrade in the natural environment and can maintain the brightness of the color for a long time.

[0040] Adding nano-silicon dioxide or nano-alumina as a stabilizer to the colorant effectively improves the stability and uniformity of the coloring slurry, avoiding precipitation and stratification during the spraying process; and by optimizing the spraying and curing process parameters, the uniform thickness and good adhesion of the coloring layer are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0042] Figure 1 Flow chart of the solar photovoltaic ribbon coloring process. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0044] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Example 1

[0048] Reference Figure 1 , which is the first embodiment of the present invention, provides a solar photovoltaic welding strip coloring process, comprising the following steps:

[0049] S1. Select a colorant and make it into a coloring slurry.

[0050] The colorant and the stabilizer are mixed in proportion, deionized water is added, and the mixture is stirred with a stirrer, wherein the speed of the stirrer is 1000 to 3000 rpm for 10 to 30 minutes;

[0051] Add antioxidant and light protectant and continue stirring for 5 to 10 minutes;

[0052] Finally, add the brightener and set the mixer speed to 1000-1500 rpm for 10-15 minutes;

[0053] Filter the stirred mixture through a 200-400 mesh filter;

[0054] The solid content and pH value of the coloring slurry are set, and the solid content and pH value of the obtained coloring slurry are at the set values.

[0055] The solid content of the coloring slurry is 20% to 40%, and the pH value of the coloring slurry is 6.0 to 8.0.

[0056] The colorant comprises one or more of pigments extracted from plants and natural mineral powders;

[0057] The plant-extracted pigment is selected from one or more of blueberry extract, carrot extract, and turmeric extract;

[0058] The natural mineral powder is selected from one or more of hematite, pyrite and chlorite.

[0059] The coloring slurry has the following raw material components in weight ratio:

[0060] Colorant: 80-90 parts;

[0061] Antioxidant: 0.5-1 part;

[0062] Light protectant: 0.5-1 part;

[0063] Brightener: 1 to 3 parts;

[0064] Stabilizer: 0.8-4.5 parts.

[0065] The brightener is a mixture of one or more of cyclohexyl benzoimidazoline quaternary ammonium salt substances, cyclohexyl imidazole compounds or aromatic imidazole salt substances.

[0066] The stabilizer is a mixture of one or more nano-silicon dioxide or nano-aluminum oxide;

[0067] The particle size of the stabilizer is 10-100 nanometers;

[0068] The ratio of the stabilizer to the colorant is 1 to 5:100.

[0069] The antioxidant is selected from one or more of vitamin C, vitamin E, and BHT;

[0070] The light protectant is selected from one or more of the ultraviolet absorber UV-531 and the hindered amine light protectant HALS.

[0071] The colorant also includes a dispersant and an anti-settling agent;

[0072] The dispersant is selected from one or more of sodium polyacrylate and polyvinyl alcohol, and the added amount is 0.5% to 2% of the weight of the colorant;

[0073] The anti-settling agent is selected from one or more of fumed silica and hydrogenated castor oil, and the added amount is 0.1% to 1% of the weight of the colorant.

[0074] S1. Clean the surface of the photovoltaic welding ribbon to remove oil and oxides on the surface.

[0075] When cleaning the surface of the photovoltaic welding strip, an ultrasonic cleaning machine is used for cleaning at a frequency of 40-60kHz, wherein the cleaning time is: 10 to 20 minutes.

[0076] S1. Spray the coloring slurry onto the surface of the photovoltaic ribbon through a spraying device.

[0077] During the spraying process, the nozzle diameter of the spraying equipment used is 0.2-0.5 mm, the spraying pressure is 0.2-0.5 MPa, and the spraying speed is 0.5-1.0 m / min.

[0078] S1. Place the sprayed photovoltaic welding strip into a curing furnace to obtain a finished welding strip.

[0079] Example 2

[0080] The second embodiment of the present invention provides a new composition description:

[0081] Colorant: carrot extract (40%) + pyrite powder (10%);

[0082] Stabilizer: nano-alumina (3%);

[0083] Antioxidants: Vitamin E (0.8%);

[0084] Light protectant: hindered amine light protectant HALS (0.8%);

[0085] Dispersant: polyvinyl alcohol (1.5%);

[0086] Anti-settling agent: hydrogenated castor oil (0.8%)

[0087] This embodiment also provides a new process parameter:

[0088] Mixing: The mixer speed is 2000 rpm and the duration is 25 min;

[0089] Filtration: 350 mesh filter;

[0090] Solid content: 35%;

[0091] pH: 7.5;

[0092] Cleaning: Ultrasonic cleaning machine at a frequency of 40kHz, cleaning time is 10min; Spraying: nozzle diameter 0.4mm, spraying pressure 0.4MPa, spraying speed 0.7m / min Curing: curing oven temperature is 130℃, time is 25min.

[0093] Example 3

[0094] The third embodiment of the present invention provides a new composition description:

[0095] Colorant: blueberry extract (50%);

[0096] Stabilizer: nano silicon dioxide (2%);

[0097] Antioxidants: Vitamin C (0.5%);

[0098] Light stabilizer: UV absorber UV-531 (0.5%);

[0099] Dispersant: sodium polyacrylate (1%);

[0100] Anti-settling agent: fumed silica (0.5%).

[0101] This embodiment also provides a new process parameter:

[0102] Mixing: The mixer speed is 1500 rpm and the duration is 20 min;

[0103] Filtration: 300 mesh filter;

[0104] Solid content: 30%;

[0105] pH: 7.0;

[0106] Cleaning: Ultrasonic cleaning machine at a frequency of 50kHz, cleaning time is 15min; Spraying: nozzle diameter 0.3mm, spraying pressure 0.3MPa, spraying speed 0.8m / min Curing: curing oven temperature is 120℃, time is 20min.

[0107] Example 4

[0108] This is the fourth embodiment of the present invention, which provides a new ingredient description: colorant: turmeric extract (30%) + chlorite powder (20%);

[0109] Stabilizer: nano silicon dioxide (4%);

[0110] Antioxidant: BHT (1%);

[0111] Light stabilizer: UV absorber UV-531 (1%);

[0112] Dispersant: sodium polyacrylate (2%);

[0113] Anti-settling agent: fumed silica (1%).

[0114] This embodiment also provides a new process parameter:

[0115] Mixing: The mixer speed is 2500 rpm and the duration is 30 min;

[0116] Filtration: 400 mesh filter;

[0117] Solid content: 40%;

[0118] pH: 8.0;

[0119] Cleaning: Ultrasonic cleaning machine at a frequency of 60kHz, cleaning time is 20min; Spraying: nozzle diameter 0.5mm, spraying pressure 0.5MPa, spraying speed 0.6m / min Curing: curing oven temperature is 150℃, time is 30min.

[0120] Comparative Example 1:

[0121] Colorant: organic dye (50%);

[0122] Dispersant: sodium polyacrylate (1%);

[0123] Anti-settling agent: fumed silica (0.5%).

[0124] Process parameters

[0125] Mixing: The mixer speed is 1500 rpm and the duration is 20 min;

[0126] Filtration: 300 mesh filter;

[0127] Solid content: 30%;

[0128] pH: 7.0;

[0129] Cleaning: Ultrasonic cleaning machine at a frequency of 50kHz, cleaning time is 15min; Spraying: nozzle diameter 0.3mm, spraying pressure 0.3MPa, spraying speed 0.8m / min; Curing: curing oven temperature is 120℃, time is 20min.

[0130] Comparative Example 2:

[0131] Colorant: metal oxide (50%);

[0132] Stabilizer: nano silicon dioxide (2%);

[0133] Dispersant: polyvinyl alcohol (1.5%);

[0134] Anti-settling agent: hydrogenated castor oil (0.8%).

[0135] Process parameters Mixing: mixer speed 2000 rpm, duration 25 min;

[0136] Filtration: 350 mesh filter;

[0137] Solid content: 35%;

[0138] pH: 7.5;

[0139] Cleaning: Ultrasonic cleaning machine at a frequency of 50kHz, cleaning time is 15min;

[0140] Spraying: nozzle diameter 0.4 mm, spraying pressure 0.4 MPa, spraying speed 0.7 m / min;

[0141] Curing: The curing oven temperature is 130°C and the duration is 25 minutes.

[0142] Table 1: Schematic diagram of the effects of different parameters

[0143] Color uniformity ΔE Adhesion grade Weathering aging time Color change rate after aging Example 2 0.6 0-1 1000h 1.3％ Example 3 0.6 0-1 1000h 1.2％ Example 4 0.5 0-1 1000h 1.5％ Comparative Example 1 1.5 2-3 1000h 6.4％ Comparative Example 2 1.1 2-3 1000h 5.8％

[0144] Examples 2 to 4 use biodegradable materials or natural minerals as colorants and combine them with nano-silicon dioxide as a stabilizer to effectively improve the stability and uniformity of the coloring slurry, so that the color uniformity reaches ΔE=0.6, 0.6 and 0.5. Comparative Example 1 uses organic dyes, which are prone to precipitation and stratification, resulting in poor color uniformity. Although Comparative Example 2 uses metal oxides, the color selection range is limited and the cost is relatively high.

[0145] The method of the present application ensures good adhesion between the coloring layer and the welding strip substrate by optimizing the spraying and curing process parameters, with an adhesion grade of 0-1. The adhesion of comparative examples 1 and 2 is poor, with an adhesion grade of 2-3, and they are easy to fall off in outdoor environments.

[0146] The method of the present application further improves the weather resistance and service life of the coloring layer by adding antioxidants and light stabilizers to the coloring slurry. The weather resistance of Example 1 is poor, and the color change rate after 1000 hours of aging is as high as 6.4%. The weather resistance of Example 2 is better, but the color change rate is still 5.8%, which is not as good as the method of the present application.

[0147] In summary: the use of colorants is not only environmentally friendly, but also has good weather resistance and color stability. Biodegradable materials such as blueberry extract, carrot extract, turmeric extract, etc., natural minerals such as hematite, pyrite, chlorite, etc., these materials are not easy to degrade in the natural environment and can maintain the brightness of the color for a long time.

[0148] Adding nano-silicon dioxide or nano-alumina as a stabilizer to the colorant effectively improves the stability and uniformity of the coloring slurry, avoiding precipitation and stratification during the spraying process; and by optimizing the spraying and curing process parameters, the uniform thickness and good adhesion of the coloring layer are ensured.

[0149] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A solar photovoltaic welding belt coloring process, characterized in that: The following steps are included: Preparation: Select colorant and make it into coloring slurry; Cleaning: Clean the surface of the photovoltaic ribbon to remove oil and oxides on the surface; Spraying: Spray the coloring slurry onto the surface of the photovoltaic ribbon through the spraying equipment; Curing: Place the sprayed photovoltaic ribbon into a curing furnace to obtain the finished ribbon.

2. The solar photovoltaic welding ribbon coloring process according to claim 1, characterized in that: The colorant comprises one or more of pigments extracted from plants and natural mineral powders; The plant-extracted pigment is selected from one or more of blueberry extract, carrot extract, and turmeric extract; The natural mineral powder is selected from one or more of hematite, pyrite and chlorite.

3. The solar photovoltaic welding strip coloring process according to claim 2, characterized in that: The coloring slurry has the following raw material components in weight ratio: Colorant: 80-90 parts; Antioxidant: 0.5-1 part; Photoprotectant: 0.5-1 part; Brightener: 1 to 3 parts; Stabilizer: 0.8-4.5 parts.

4. The solar photovoltaic welding strip coloring process as claimed in claim 3, characterized in that: The brightener is a mixture of one or more of cyclohexyl benzoimidazoline quaternary ammonium salt substances, cyclohexyl imidazole compounds or aromatic imidazole salt substances.

5. The solar photovoltaic welding ribbon coloring process as claimed in claim 4, characterized in that: The stabilizer is a mixture of one or more nano-silicon dioxide or nano-aluminum oxide; The particle size of the stabilizer is 10-100 nanometers; The ratio of the stabilizer to the colorant is 1 to 5:

100.

6. The solar photovoltaic welding strip coloring process as claimed in claim 5, characterized in that: The antioxidant is selected from one or more of vitamin C, vitamin E, and BHT; The light protectant is selected from one or more of the ultraviolet absorber UV-531 and the hindered amine light protectant HALS.

7. The solar photovoltaic welding strip coloring process according to claim 6, characterized in that: The colorant also includes a dispersant and an anti-settling agent; The dispersant is selected from one or more of sodium polyacrylate and polyvinyl alcohol, and the added amount is 0.5% to 2% of the weight of the colorant; The anti-settling agent is selected from one or more of fumed silica and hydrogenated castor oil, and the added amount is 0.1% to 1% of the weight of the colorant.

8. The solar photovoltaic welding ribbon coloring process according to claim 7, characterized in that: When cleaning the surface of the photovoltaic welding ribbon, use an ultrasonic cleaning machine at a frequency of 40-60kHz, where the cleaning time is: 10 to 20 minutes; During the spraying process, the nozzle diameter of the spraying equipment used is 0.2-0.5 mm, the spraying pressure is 0.2-0.5 MPa, and the spraying speed is 0.5-1.0 m / min.

9. The solar photovoltaic welding ribbon coloring process according to claim 8, characterized in that: The steps of preparing the coloring slurry include: The colorant and the stabilizer are mixed in proportion, deionized water is added, and the mixture is stirred with a stirrer, wherein the speed of the stirrer is 1000 to 3000 rpm for 10 to 30 minutes; Add antioxidant and light protectant and continue stirring for 5 to 10 minutes; Finally, add the brightener and set the mixer speed to 1000-1500 rpm for 10-15 minutes; Filter the stirred mixture through a 200-400 mesh filter; The solid content and pH value of the coloring slurry are set, and the solid content and pH value of the obtained coloring slurry are at the set values.

10. The solar photovoltaic welding ribbon coloring process according to claim 9, characterized in that: The solid content of the coloring slurry is 20% to 40%, and the pH value of the coloring slurry is 6.0 to 8.0.

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