CN114292551A - High-gloss tin-free coating of black bus bar and preparation method of black bus bar - Google Patents
High-gloss tin-free coating of black bus bar and preparation method of black bus bar Download PDFInfo
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- CN114292551A CN114292551A CN202111519581.6A CN202111519581A CN114292551A CN 114292551 A CN114292551 A CN 114292551A CN 202111519581 A CN202111519581 A CN 202111519581A CN 114292551 A CN114292551 A CN 114292551A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention discloses a high-gloss tin-free coating of a black bus bar and a preparation method of the black bus bar, wherein the high-gloss tin-free coating comprises the following components in parts by weight: 25-30 parts of water-based polyhydroxy acrylic emulsion, 3-10 parts of fluorine modified acrylic emulsion, 5-6 parts of carbon black, 5-10 parts of nano titanium dioxide, 15-25 parts of isobutanol, 10-15 parts of diethylene glycol monobutyl ether, 5-8 parts of water, 4-8 parts of water-based amino resin and 0.5-1 part of water-based leveling agent, by using the formula, the unprinted area is uniformly plated with tin-lead alloy during tin plating, and the tin-lead alloy can only slightly adhere to the printed area due to low surface energy and can be scraped off by an air knife when leaving a tin furnace, so that the surface of a coating is ensured to be clean, meanwhile, the highlight tin-free ink has excellent heat resistance compared with other inks, and the copper base has higher melting point, so that the copper base of a printing stock printed by the ink due to overhigh welding temperature is not melted, thereby avoiding the displacement of the ink layer and facilitating the use of customers.
Description
Technical Field
The invention relates to the field of photovoltaic materials, in particular to a high-gloss tin-free coating of a black bus bar and a preparation method of the black bus bar.
Background
Photovoltaic busbars are the primary devices for collecting the current generated by silicon cells and are of some importance in the photovoltaic industry. The conventional bus bar is mainly silver white of tin-lead alloy, and has a larger color difference with a silicon battery plate. To keep the color uniform, black bus bars were developed. In the traditional process, the black bus bar is realized by adopting a film pasting mode, and the method has the problem that the adhesive tape falls off after a long time. There are also black bus bars prepared by ink-jet methods, which have poor product properties, such as non-uniform color and non-uniform coating thickness. In addition, the black bus bar needs to be welded with the interconnection bar at high temperature, and after the black bus bar is printed by adopting common ink, the black bus bar can be brittle at high temperature and cannot be bent, or bad phenomena such as welding deinking, discoloration, foaming and the like can occur, so that the production of component customers is seriously influenced. In some patents, the black visual effect is realized by a laser etching method, but the process has high cost and is not beneficial to mass production.
Disclosure of Invention
The invention aims to provide a high-gloss tin-free coating of a black bus bar, which is uniform in thickness and free of tin-free coating.
The technical scheme adopted by the invention for solving the technical problems is as follows: a high-gloss tin-free coating of a black bus bar comprises the following components in parts by weight:
25-30 parts of water-based polyhydroxy acrylic emulsion, 3-10 parts of fluorine modified acrylic emulsion, 5-6 parts of carbon black, 5-10 parts of nano titanium dioxide, 15-25 parts of isobutanol, 10-15 parts of diethylene glycol monobutyl ether, 5-8 parts of water, 4-8 parts of water-based amino resin and 0.5-1 part of water-based leveling agent;
adding the above materials into a stirrer, and stirring for 25-35 min;
and (3) uniformly stirring and mixing, and then putting into a grinding machine for grinding for 1-3 h to obtain the water-based low-surface-energy high-gloss ink slurry.
Further, the method comprises the following steps: the particle size range of the nano-scale titanium dioxide is 50-150 nm.
Further, the method comprises the following steps: the water-based amino resin is Cyanote385 water-based amino resin.
Further, the method comprises the following steps: the water-based leveling agent is BYK-333 water-based leveling agent.
The invention also discloses a preparation method of the black bus bar, which comprises the high-gloss tin-free coating of the black bus bar, and comprises the following steps:
(1) after surface degreasing treatment is carried out on the rolled copper strips, the rolled copper strips are arranged on a high-temperature-resistant silicon adhesive tape at equal intervals by adopting a film covering device, the arrangement number of the copper strips is determined according to the width of the adhesive tape and the size of the copper strips, and the interval between the adjacent parallel copper strips is 4-10 mm;
(2) the coated copper strip is printed with a highlight tin-free coating through a bus bar coating control wheel device, the printed copper strip is baked through a high-temperature drying tunnel at the temperature of 160-200 ℃ for 3-7min, the dried copper strip is stripped through a film stripping machine, the stripped copper strip is respectively wound onto a hollow H-shaped shaft, and one copper strip corresponds to one hollow H-shaped shaft;
(3) and the printed copper strip is fixed on a tinning device, sequentially passes through a scaling powder tank and a tin melting furnace, scrapes out redundant tin-lead alloy through an air knife, and then is cooled and rolled to complete the manufacture of a finished product.
The invention has the beneficial effects that:
1) when the copper strip coated with the non-sticky tin ink is subjected to dip plating, the unprinted area is uniformly plated with the tin-lead alloy, and the tin-lead alloy can only slightly adhere to the printed area due to low surface energy and is scraped off by the air knife when the printed area is taken out of the tin furnace, so that the cleanness of the surface of the coating is ensured.
2) The high-gloss tin-free ink has better temperature resistance effect than other inks, and can meet the integrity of a coating during tin plating.
3) When the ink is printed on copper, the copper base cannot be melted during welding, the ink layer cannot be displaced, and the adhesive force of the coating cannot be obviously influenced. The assembly plant can rely on the performance to improve the temperature of the welding head and shorten the shorter welding time, thereby improving the production efficiency of the assembly.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The embodiment of the application discloses a preparation method of a high-gloss tin-free coating of a black bus bar, which comprises the following components in parts by weight:
25-30 parts of water-based polyhydroxy acrylic emulsion, 3-10 parts of fluorine modified acrylic emulsion, 5-6 parts of carbon black, 5-10 parts of nano titanium dioxide, 15-25 parts of isobutanol, 10-15 parts of diethylene glycol monobutyl ether, 5-8 parts of water, 4-8 parts of water-based amino resin and 0.5-1 part of water-based leveling agent.
Adding the above materials into a stirrer, and stirring for 25-35min, wherein the stirring time can be 25min, 30min, 35min, etc.
And (3) uniformly stirring and mixing, and then grinding in a grinder for 1-3 h to obtain the water-based low-surface-energy high-gloss ink slurry, wherein the specific grinding time can be 1h, 2h, 3h and the like.
Specifically, the particle size range of the nano-scale titanium dioxide is 50-150nm, and specifically can be 50nm, 120nm, 150nm and the like.
Specifically, the water-based amino resin is Cyanote 385 water-based amino resin, the water-based leveling agent is BYK-333 water-based leveling agent, and water-based amino resin and water-based leveling agent with other specifications can be selected according to requirements.
The functions of the components are respectively as follows:
the water-based polyhydroxy acrylic emulsion is a film-forming substance, can generate a crosslinking reaction with water-based amino resin at high temperature to form a compact coating, wraps pigments and fillers, and forms good adhesion with a copper base.
The fluorine modified acrylic emulsion has the function of reducing the surface energy of the coating. Carbon black is a coating pigment component that primarily imparts color to the coating.
The nano-scale titanium dioxide has self-cleaning performance, is mainly used as a functional filler in a coating system, improves the mechanical performance of the coating, and simultaneously plays a role in reducing the surface energy of the coating.
Isobutanol, diethylene glycol monobutyl ether and water are used as solvents, so that the dispersing effect is achieved, and the volatilization speed and the viscosity change of the slurry in the coating printing process are controlled.
The water-based amino resin is a cross-linking agent, is mainly cross-linked with a film-forming substance to form a network structure, and is self-polymerized at high temperature to provide a part of flexibility of the coating.
The aqueous leveling agent is used as an auxiliary agent, so that the leveling property of the sizing agent can be improved, and the aqueous system sizing agent is prevented from forming shrinkage cavities during printing to cause poor appearance.
The invention also discloses a preparation method of the black bus bar, which comprises the highlight tin-free coating and comprises the following steps:
step 1: after the surface degreasing treatment is carried out on the rolled copper strips, the rolled copper strips are arranged on a high-temperature-resistant silicon adhesive tape at equal intervals by adopting a film covering device, the arrangement number of the copper strips is determined according to the width of the adhesive tape and the size of the copper strips, and the interval between the adjacent parallel copper strips is about 4-10 mm.
Step 2: the coated copper strip is printed with a highlight tin-free coating through a bus bar coating control wheel device, the printed copper strip is baked through a high-temperature drying tunnel at the temperature of 160-200 ℃ for 3-7min, the dried copper strip is stripped through a film stripping machine, the stripped copper strip is respectively rolled onto an I-shaped hollow shaft, and one copper strip corresponds to one I-shaped hollow shaft.
And step 3: and the printed copper strip is fixed on a tinning device, sequentially passes through a scaling powder tank and a tin melting furnace, scrapes out redundant tin-lead alloy through an air knife, and then is cooled and rolled to complete the manufacture of a finished product.
By using the formula and the process, when the copper strip in the step 3 is subjected to dip plating, the unprinted area is uniformly plated with the tin-lead alloy, and the printed area is only slightly adhered to the tin-lead alloy due to low surface energy and is scraped off by an air knife when the copper strip is discharged from a tin furnace, so that the surface of the coating is ensured to be clean.
The following are specific examples and comparative examples:
example 1
(1) 26 parts of water-based acrylic resin emulsion, 5 parts of fluorine modified acrylic emulsion, 6 parts of carbon black, 5 parts of nano titanium dioxide, 18 parts of isobutanol, 12 parts of diethylene glycol monobutyl ether, 6 parts of water, 6 parts of cyante 385 water-based amino resin and 0.5 part of BYK-333 flatting agent are weighed. Adding the above materials into a stirrer, and stirring for 30 min. And grinding the mixture by a grinder for 1h after the mixture is uniformly mixed to obtain the water-based low-surface-energy high-gloss ink slurry.
(2) After the surface degreasing treatment is carried out on the rolled copper strips, the rolled copper strips are arranged on the high-temperature-resistant silicon adhesive tape at equal intervals by adopting a film covering device. The arrangement number of the copper strips is determined according to the width of the adhesive tape and the size of the copper strips, and the distance between the adjacent parallel copper strips is about 5 mm. And (3) printing the copper strip coated with the film by highlight tin-free ink through a printing device of a bus bar coating control wheel device, and baking the printed copper strip through a high-temperature baking channel at the temperature of 180 ℃ for 4 min. The dry film thickness is 15um, the copper strips after drying are peeled off by the adhesive tape through the film uncovering machine, and the peeled copper strips are respectively rolled on the H-shaped hollow shaft. And the printed copper strip is fixed on a tinning device, sequentially passes through a scaling powder tank and a tin melting furnace, scrapes out redundant tin-lead alloy through an air knife, and then is cooled and rolled to complete the manufacture of a finished product.
Example 2
(1) Weighing 26 parts of water-based acrylic resin emulsion, 9 parts of fluorine modified acrylic emulsion, 6 parts of carbon black, 5 parts of nano titanium dioxide, 21 parts of isobutanol, 13 parts of diethylene glycol monobutyl ether, 6 parts of water, 6 parts of cyante 385 water-based amino resin and 0.8 part of BYK-333 flatting agent. Adding the above materials into a stirrer, and stirring for 30 min. And grinding the mixture by a grinder for 1h after the mixture is uniformly mixed to obtain the water-based low-surface-energy high-gloss ink slurry.
(2) After the surface degreasing treatment is carried out on the rolled copper strips, the rolled copper strips are arranged on the high-temperature-resistant silicon adhesive tape at equal intervals by adopting a film covering device. The arrangement number of the copper strips is determined according to the width of the adhesive tape and the size of the copper strips, and the distance between the adjacent parallel copper strips is about 5 mm. The copper strip after film covering is printed by highlight tin-free ink through a printing device of a bus bar coating control wheel device, the printed copper strip is baked through a high-temperature drying tunnel, the temperature of the drying tunnel is 200 ℃, the baking time is 4min, the thickness of a dry film is 18 mu m, the baked copper strip is stripped through a film stripping machine, and the stripped copper strip is respectively rolled onto a hollow H-shaped shaft. And the printed copper strip is fixed on a tinning device, sequentially passes through a scaling powder tank and a tin melting furnace, scrapes out redundant tin-lead alloy through an air knife, and then is cooled and rolled to complete the manufacture of a finished product.
Example 3
(1) 26 parts of water-based acrylic resin emulsion, 5 parts of fluorine modified acrylic emulsion, 6 parts of carbon black, 8 parts of nano titanium dioxide, 18 parts of isobutanol, 12 parts of diethylene glycol monobutyl ether, 8 parts of water, 6 parts of cyante 385 water-based amino resin and 0.8 part of BYK-333 flatting agent are weighed. Adding the above materials into a stirrer, and stirring for 30 min. And grinding the mixture by a grinder for 1h after the mixture is uniformly mixed to obtain the water-based low-surface-energy high-gloss ink slurry.
(2) After the surface degreasing treatment is carried out on the rolled copper strips, the rolled copper strips are arranged on the high-temperature-resistant silicon adhesive tape at equal intervals by adopting a film covering device. The arrangement number of the copper strips is determined according to the width of the adhesive tape and the size of the copper strips, and the distance between the adjacent parallel copper strips is about 5 mm. And (3) printing the copper strip coated with the film by highlight tin-free ink through a printing device of a bus bar coating control wheel device, and baking the printed copper strip through a high-temperature baking channel at the temperature of 180 ℃ for 6 min. The dry film thickness is 14um, the copper strips after drying are stripped through a film stripping machine, and the stripped copper strips are respectively rolled on an I-shaped hollow shaft. And the printed copper strip is fixed on a tinning device, sequentially passes through a scaling powder tank and a tin melting furnace, scrapes out redundant tin-lead alloy through an air knife, and then is cooled and rolled to complete the manufacture of a finished product.
Example 4
(1) Weighing 30 parts of water-based acrylic resin emulsion, 8 parts of fluorine modified acrylic emulsion, 6 parts of carbon black, 10 parts of nano titanium dioxide, 20 parts of isobutanol, 13 parts of diethylene glycol monobutyl ether, 8 parts of water, 7 parts of cyanite 385 water-based amino resin and 1 part of BYK-333 flatting agent. Adding the above materials into a stirrer, and stirring for 30 min. And grinding the mixture by a grinder for 1h after the mixture is uniformly mixed to obtain the water-based low-surface-energy high-gloss ink slurry.
(2) After the surface degreasing treatment is carried out on the rolled copper strips, the rolled copper strips are arranged on the high-temperature-resistant silicon adhesive tape at equal intervals by adopting a film covering device. The arrangement number of the copper strips is determined according to the width of the adhesive tape and the size of the copper strips, and the distance between the adjacent parallel copper strips is about 5 mm. And (3) printing the coated copper strip by highlight tin-free ink through a printing device of a bus bar coating control wheel device, and baking the printed copper strip through a high-temperature baking channel at the temperature of 190 ℃ for 5 min. The dry film thickness is 15um, the copper strips after drying are peeled off by the adhesive tape through the film uncovering machine, and the peeled copper strips are respectively rolled on the H-shaped hollow shaft. And the printed copper strip is fixed on a tinning device, sequentially passes through a scaling powder tank and a tin melting furnace, scrapes out redundant tin-lead alloy through an air knife, and then is cooled and rolled to complete the manufacture of a finished product.
Comparative example 1
(1) 26 parts of water-based acrylic resin emulsion, 6 parts of carbon black, 18 parts of isobutanol, 12 parts of diethylene glycol monobutyl ether, 6 parts of water, 6 parts of cyante 385 water-based amino resin and 0.5 part of BYK-333 leveling agent are weighed. Adding the above materials into a stirrer, and stirring for 30 min. And grinding the mixture by a grinder for 1h after the mixture is uniformly mixed to obtain the water-based low-surface-energy high-gloss ink slurry.
(2) And (4) degreasing the surface of the rolled copper strip. And (3) spraying in a spraying mode, and baking the sprayed copper strip through a high-temperature baking channel at the temperature of 200 ℃ for 5 min. The thickness of the dry film is 15um, and the dried copper strips are respectively rolled on an I-shaped hollow shaft. And the printed copper strip is fixed on a tinning device, sequentially passes through a scaling powder tank and a tin melting furnace, scrapes out redundant tin-lead alloy through an air knife, and then is cooled and rolled to complete the manufacture of a finished product.
Comparative example 2
(1) Weighing 30 parts of water-based acrylic resin emulsion, 5 parts of carbon black, 18 parts of isobutanol, 15 parts of diethylene glycol monobutyl ether, 7 parts of water, 5 parts of cyante 385 water-based amino resin and 0.5 part of BYK-333 flatting agent. Adding the above materials into a stirrer, and stirring for 30 min. And grinding the mixture by a grinder for 1h after the mixture is uniformly mixed to obtain the water-based low-surface-energy high-gloss ink slurry.
(2) And (4) degreasing the surface of the rolled copper strip. And (3) spraying in a spraying mode, and baking the sprayed copper strip through a high-temperature baking channel at the temperature of 200 ℃ for 8 min. The dry film thickness is 14um, and the copper strips after drying are respectively rolled up to the I-shaped hollow shaft. And the printed copper strip is fixed on a tinning device, sequentially passes through a scaling powder tank and a tin melting furnace, scrapes out redundant tin-lead alloy through an air knife, and then is cooled and rolled to complete the manufacture of a finished product.
The following are the experimental results of the above examples:
and (4) conclusion:
(1) by comparing examples 1-4 with comparative examples 1-2, it can be seen that the coating water contact angle is increased significantly by using the non-wetting ink, the nano titanium dioxide and the fluorine modified acrylic resin have the function of reducing the surface energy of the coating, when the copper strip coated with the non-wetting ink is subjected to dip plating, the unprinted area is uniformly plated with tin-lead alloy, and the printed area is slightly adhered with the tin-lead alloy due to low surface energy and is scraped off by an air knife when the copper strip is taken out of a tin furnace, so that the surface cleanness of the coating is ensured.
(2) By comparing examples 1-4 with comparative examples 1-2, it can be seen that the high-gloss tin-free ink has better temperature resistance than other inks, and can satisfy the integrity of the coating during tin plating.
(3) From examples 1 to 4, it can be seen that the soldering performance of the ink printed directly on the copper substrate is also significantly improved and the ink can withstand higher temperature, because the tin under the black coating of the double-sided tin-plated black bus tape used at present is also melted by heating during soldering, so that the coating is slightly displaced along with the melted tin layer. When the ink is printed on copper, the copper base can not be melted during welding, the ink layer can not be displaced, and the adhesive force of the coating can not be obviously influenced. The assembly factory can improve the temperature of the welding head by means of the performance, shorten shorter welding time and improve the production efficiency of the assembly.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The high-gloss tin-free coating of the black bus bar is characterized by comprising the following components in parts by weight:
25-30 parts of water-based polyhydroxy acrylic emulsion, 3-10 parts of fluorine modified acrylic emulsion, 5-6 parts of carbon black, 5-10 parts of nano titanium dioxide, 15-25 parts of isobutanol, 10-15 parts of diethylene glycol monobutyl ether, 5-8 parts of water, 4-8 parts of water-based amino resin and 0.5-1 part of water-based leveling agent.
2. The high light tin non-stick coating of the black bus bar of claim 1, wherein the nano-sized titanium dioxide has a particle size ranging from 50 to 150 nm.
3. The high gloss tin-free coating for a black bus bar according to claim 1, wherein the aqueous amino resin is cyante 385 aqueous amino resin.
4. The high-gloss tin-free coating layer of a black bus bar according to claim 1, wherein a BYK-333 aqueous leveling agent is used as the aqueous leveling agent.
5. A method for producing a black bus bar, comprising the high light tin-repellent coating layer of the black bus bar according to any one of claims 1 to 4, comprising the steps of:
(1) after surface degreasing treatment is carried out on the rolled copper strips, the rolled copper strips are arranged on a high-temperature-resistant silicon adhesive tape at equal intervals by adopting a film covering device, the arrangement number of the copper strips is determined according to the width of the adhesive tape and the size of the copper strips, and the interval between adjacent parallel copper strips is 4-10 mm;
(2) the coated copper strip is printed with a highlight tin-free coating through a bus bar coating control wheel device, the printed copper strip is baked through a high-temperature drying tunnel at the temperature of 160-200 ℃ for 3-7min, the dried copper strip is stripped through a film stripping machine, the stripped copper strip is respectively wound onto a hollow H-shaped shaft, and one copper strip corresponds to one hollow H-shaped shaft;
(3) and the printed copper strip is fixed on a tinning device, sequentially passes through a scaling powder tank and a tin melting furnace, scrapes out redundant tin-lead alloy through an air knife, and then is cooled and rolled to complete the manufacture of a finished product.
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| CN112259628A (en) * | 2020-10-26 | 2021-01-22 | 杨磊 | Preparation method of colored photovoltaic tin-coated copper strip |
| CN112958395A (en) * | 2021-01-30 | 2021-06-15 | 江苏威腾新材料科技有限公司 | Manufacturing method of photovoltaic coating solder strip and painting automation device thereof |
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2021
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| US20060046005A1 (en) * | 2004-08-24 | 2006-03-02 | Mcgee Dennis E | Coating for polymeric labels |
| JP2011117049A (en) * | 2009-12-04 | 2011-06-16 | Kobe Steel Ltd | Copper material and copper alloy material for laser welding |
| CN103275581A (en) * | 2013-06-19 | 2013-09-04 | 国家电网公司 | Ice coating prevention paint for power transmission cable and preparation method thereof |
| CN109337487A (en) * | 2018-09-21 | 2019-02-15 | 武汉同发科技有限公司 | A kind of water soluble acrylic acid amino-stoving varnish |
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