Screen surface spray treatment process and application thereof

Abstract

The present application belongs to the field of printing, especially relates to the field of B41C1 / 14, and more particularly relates to a screen printing plate surface spraying treatment process and application thereof. The steps of the screen printing plate surface spraying treatment process include: screen stretching, steel wire removing, cleaning, film pasting, laser engraving, surface spraying, screen printing plate inspection and packaging. The present application forms a uniform layer on the surface of the screen printing plate by using specific process steps for screen printing plate surface spraying, fills the cutting traces, makes the surface smooth, reduces the slurry accumulation in the printing process, increases the ink passing capacity, makes the printing smooth and the pattern complete, and is especially suitable for application in the production and manufacturing of solar photovoltaic cells.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of printing, especially relates to the field of B41C1 / 14, and more particularly relates to a screen surface spraying treatment process and application thereof. BACKGROUND

[0002] The conventional treatment method of the printing screen is as follows: after the stainless steel screen cloth is stretched, it is bonded to the screen frame, and then after a certain treatment to remove oil stains and impurities, coating is carried out, and a pattern is formed by laser engraving. The stainless steel screen is composed of stainless steel screen gauze with different aperture and screen gauze coated on the screen frame. The most concerned point in the preparation of the screen is the cost and the subsequent photoelectric conversion efficiency applied in the battery. Usually, one screen can print multiple solar cells. If the service life and preparation efficiency of the screen can be effectively improved, the production cost can be saved. Due to excellent stability and wear resistance, polyimide (PI) film is often applied in screen surface spraying treatment instead of photosensitive glue. The mainstream technology for preparing the screen used for printing photovoltaic cells at present is as follows: a certain thickness of PI film is attached to the surface of steel wire mesh with the required specification by hot pressing or other methods to make a semi-finished product, and then the PI film of the required pattern part is removed on the semi-finished product by laser melting cutting. The PI film of the pattern part is hollowed out, and only the steel wire mesh support is left as the ink transfer area.

[0003] The prior art for patent CN109094177 A discloses a preparation process of a screen printing screen without screen joints, mainly including seven steps of screen stretching, screen gauze arrangement, sand engraving treatment, degreasing, coating, plate exposure and development. The preparation process can avoid the problem of screen gauze breakage caused by the existence of joints, and also improves the energy consumption in the preparation process and the photoelectric conversion efficiency. However, it ignores the problem of scratches on the film after coating, which will have a certain impact on the subsequent printing. The prior art for patent CN112428659 A discloses a process for screen coating using photosensitive glue and PI, including pouring the photosensitive glue into a scraper, coating the photosensitive glue from the ink surface, flat-end scraping, and collecting residual glue. The screen prepared by the preparation method has the technical advantages of easy flatness, demolding and rework. However, the process only includes the film pasting process, and the subsequent coating process is not perfect. There may still be scratches on the surface after film pasting. Therefore, it has become a research hotspot to provide a process with better screen surface spraying treatment effect. SUMMARY

[0004] In order to solve the above problems, the present application provides a screen surface spraying treatment process, which at least includes the following steps:

[0005] S1, screen stretching: stretch the stainless steel wire mesh, paste it on the aluminum frame with glue, and get the stretched screen;

[0006] S2, removing steel wire: using laser equipment to remove the steel wire on the stretched screen according to the design drawing, so as to obtain the screen with removed steel wire;

[0007] S3, cleaning: applying the degreasing agent to the screen with removed steel wire to brush and remove oil from the steel wire;

[0008] S4, film pasting: pasting the PI film on the surface of the screen after cleaning and removing oil;

[0009] S5, laser engraving: performing laser engraving on the screen with pasted PI film;

[0010] S6, surface spraying: spraying a layer of surface material on the surface of the screen after laser engraving through the surface nano spraying technology, naturally air-drying and then drying, so that a uniform coating is formed on the surface of the screen after drying, and the cutting trace is filled flat;

[0011] S7, screen inspection: inspecting whether the screen after surface spraying is qualified;

[0012] S8, packaging: packaging the qualified screen.

[0013] Preferably, the mesh number of the stainless steel wire screen is 500-600.

[0014] Further preferably, the mesh number of the stainless steel wire screen is 520.

[0015] The mesh number of the stainless steel wire screen used in the application is preferably 500-600, and more preferably the mesh number of the stainless steel wire screen is 520. The present inventors have found in actual experiments that if the aperture is too large, the steel wire of the corresponding stainless steel wire screen will be thick. If the steel wire is too thick, it is difficult for the slurry to be directly printed on the stainless steel wire screen in subsequent actual production, or the plasticity of the slurry is deteriorated to affect the aspect ratio of the material. If the aperture is too small, the amount of sprayed slurry is large, which will increase the production cost. Only when the number of the stainless steel wire screen is 500-600, the slurry can be effectively printed on the steel plate, and the amount of sprayed slurry is appropriate, thereby reducing the production cost.

[0016] Preferably, the degreasing agent at least includes organic components and inorganic components.

[0017] Further preferably, the organic components at least include at least one of dodecanol polyoxyethylene ether, sodium dodecyl sulfate, sodium dodecyl sulfonate and ethanol.

[0018] Further preferably, the organic components at least include dodecanol polyoxyethylene ether and ethanol.

[0019] Further preferably, the inorganic components at least include water.

[0020] Further preferably, the mass ratio of the dodecanol polyoxyethylene ether, ethanol, and water is (1-3) : (5-9) : (20-40).

[0021] As an implementable case, the mass ratio of the dodecanol polyoxyethylene ether, ethanol, and water can include 2:7:30, 1:6:25, 3:9:30.

[0022] Preferably, the thickness of the PI film in the S4 step is 2.5-5.0 μm.

[0023] As an implementable case, the thickness of the PI film in the S4 step can include 2.5 μm, 3 μm, 3.5 μm, 4 μm, 4.5 μm, or 5 μm.

[0024] Preferably, the drying time in the S6 step is 30-60 min, and the drying temperature is 40-60°C.

[0025] Further preferably, the drying time in the S6 step is 45 min, and the drying temperature is 50°C.

[0026] Preferably, the preparation raw material of the surface material at least includes, in terms of mass percentage: 40-70% acrylate monomer, 10-20% acrylate organic silicon monomer, 3-5% additive, 0.8-1.5% initiator, and 10-45% organic solvent.

[0027] Further preferably, the acrylate monomer at least includes one of methyl acrylate, ethyl acrylate, n-butyl acrylate, hydroxyethyl acrylate, 2-methyl methyl acrylate, 2-methyl ethyl acrylate, 2-methyl n-butyl acrylate, and 2-methyl hydroxyethyl acrylate.

[0028] Further preferably, the acrylate organic silicon monomer at least includes triisopropyl silyl acrylate and organic silicon modified acrylate monomer.

[0029] Further preferably, the mass ratio of the triisopropyl silyl acrylate and the organic silicon modified acrylate monomer is 1: (1.2-1.5); as an implementable case, the mass ratio of the triisopropyl silyl acrylate and the organic silicon modified acrylate monomer can include 1:1.2, 1:1.3, 1:1.4, or 1:1.5.

[0030] Further preferably, the organic silicon modified acrylate monomer is an organic silicon epoxy modified acrylate resin; as an implementable case, the organic silicon epoxy modified acrylate resin is SJ-804 organic silicon epoxy modified acrylate resin.

[0031] Further preferably, the initiator at least includes one of t-butyl peroxyacetate, dibenzoyl peroxide, cumene hydroperoxide, azobisisobutyronitrile, and azobisisoheptyl nitrile.

[0032] Preferably, the assistant is a leveling agent and a defoaming agent.

[0033] Further preferably, the leveling agent is a fast leveling agent; as an implementable case, the fast leveling agent includes one of Lencolo 3002 fast leveling agent, fast leveling agent SHYT4408, and Dowsen FL21F.

[0034] Further preferably, the defoaming agent at least includes an organic silicon defoaming agent and an organic fluorine defoaming agent.

[0035] Further preferably, the mass ratio of the organic silicon defoaming agent and the organic fluorine defoaming agent is 1:(1.5-2); as an implementable case, the mass ratio of the organic silicon defoaming agent and the organic fluorine defoaming agent can include 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, or 1:2.

[0036] Further preferably, the organic silicon defoaming agent is an organic silicon polyether defoaming agent.

[0037] Further preferably, the organic fluorine defoaming agent is a fluorosilicon modified defoaming agent.

[0038] Further preferably, the organic solvent at least includes one of ethyl acetate, tetrahydrofuran, butyl acetate, and n-butanol.

[0039] Preferably, the surface material spraying thickness is 1-3 μm; as an implementable case, the surface material spraying thickness can include 1 μm, 1.5 μm, 1.8 μm, 2 μm, 2.5 μm, or 3 μm.

[0040] The second aspect of the present application provides an application of a screen surface spraying treatment process, and the screen surface spraying process is applied in the production and manufacturing of solar photovoltaic cells.

[0041] Advantages

[0042] (I) The present application uses a specific process step to spray the screen surface, forms a uniform surface material coating on the screen surface, fills in the cutting marks, smooths the surface, reduces the slurry accumulation in the printing process, increases the ink transfer capacity, makes the printing smooth, and the pattern complete, and is especially suitable for application in the production and manufacturing of solar photovoltaic cells, and can realize the fine line printing of conductive slurry within 15 microns.

[0043] (II) The present application can not only ensure that the paste is printed on the stainless steel wire mesh by selecting a specific pore size of the stainless steel wire mesh, but also has a suitable paste consumption, and the subsequent conductive paste consumption is further reduced, which can reduce the production cost without affecting the photoelectric conversion efficiency of the conductive paste sprayed on the present steel wire mesh.

[0044] (III) The present application can make the stainless steel wire mesh according to the actual spraying needs of the customer by using the step of removing the steel wire in the process step, so that the corresponding steel wire warp and weft can be removed, and different patterns can be printed on the stainless steel wire mesh.

[0045] (IV) In the present application, the substrate is prepared from specific raw materials. The crosslinking polymerization of the acrylate monomer and the acrylate organic silicon monomer in the solvent due to the initiation of the initiator can produce intermolecular hydrogen bonds with the ester organic components in the conductive silver paste, thereby ensuring the mechanical properties of the sprayed substrate film and the adhesion of the conductive silver paste. By dispersing the dispersing agent and the defoaming agent, the organic solvent can be better mixed, the surface flatness of the substrate after spraying is ensured, the subsequent conductive silver paste can be further sprayed on the surface of the stainless steel wire mesh, the line width and thickness of the spraying are reduced, the grid breakage is reduced, the preparation cost of the solar photovoltaic cell is reduced, the preparation efficiency is improved, and the printable times and service life of the stainless steel wire mesh are increased. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 An enlarged view of the surface of the stainless steel wire mesh treated in Example 1 after spraying. DETAILED DESCRIPTION

[0047] Example 1

[0048] The first aspect of the present embodiment provides a screen surface spraying treatment process, and the specific process steps are as follows:

[0049] S1, stretching the screen: stretch the 520-mesh stainless steel wire mesh tightly, and paste it on the aluminum frame using glue to obtain a stretched screen;

[0050] S2, removing the steel wire: use a laser device to partially remove the steel wire on the stretched screen according to the design drawing, thereby obtaining a screen with removed steel wire;

[0051] S3, cleaning: apply a degreasing agent to the screen with removed steel wire and brush it to remove oil from the steel wire;

[0052] S4, pasting the film: paste a PI film on the surface of the screen after cleaning and removing oil, and the thickness of the PI film is 3.5 μm;

[0053] S5, laser engraving: laser engrave the screen with pasted PI film;

[0054] S6, surface spraying: the surface nano-spraying technology is used to spray a layer of surface material on the screen surface, and then the screen surface is naturally dried and then baked for 45 min at 50℃, so that a uniform layer is formed on the screen surface to fill the cutting marks, and the spraying thickness of the surface material is 100 nm;

[0055] S7, screen inspection: the screen after laser treatment is inspected;

[0056] S8, packaging: the qualified screen is packaged.

[0057] The stainless steel wire screen is purchased from Japan ASADA.

[0058] The preparation raw materials of the degreasing agent are dodecanol polyoxyethylene ether, ethanol and water, and the mass ratio is 2:7:30; the amount of the degreasing agent is 0.12 g / cm2 according to the area of the stainless steel wire screen. 2 .

[0059] The preparation raw materials of the surface material are 60% acrylate monomer, 12% acrylate silicone monomer, 4% additive, 1.2% initiator and 22.8% organic solvent.

[0060] The acrylate monomer is 2-methyl methacrylate (CAS number: 80-62-6); the acrylate silicone monomer is triisopropylsilyl acrylate (CAS number: 157859-20-6) and silicone-modified acrylate monomer, and the mass ratio is 1:1.5; the silicone-modified acrylate monomer is SJ-804 silicone epoxy-modified acrylic resin, purchased from Jining Tangyi Chemical Co., Ltd.; the additive is a leveling agent and a defoaming agent, and the mass ratio of the leveling agent to the defoaming agent is 3:2; the leveling agent is a fast leveling agent Dowsen FL21F; the defoaming agent is a silicone defoaming agent and an organic fluorine defoaming agent, and the mass ratio is 1:1.5; the silicone defoaming agent is a silicone polyether defoaming agent F-521, purchased from Shanghai Fexier Industrial Technology Co., Ltd.; the organic fluorine defoaming agent is a fluorosilicon-modified defoaming agent, purchased from Hangzhou Baolide Silicone Co., Ltd.; the initiator is azobisisobutyronitrile (CAS number: 78-67-1); the organic solvent is ethyl acetate (CAS number: 141-78-6); and the spraying thickness of the surface material is 1.5 μm.

[0061] The enlarged view of the surface of the stainless steel wire screen treated in Example 1 after surface spraying is shown in Figure 1 .

[0062] The second aspect of the embodiment provides an application of the screen surface spraying treatment process, which is applied in the production and manufacturing of solar photovoltaic cells.

[0063] Example 2

[0064] The first aspect of the embodiment provides a screen surface spraying treatment process, and specific process steps are as follows:

[0065] S1, screen stretching: a 520-mesh stainless steel wire screen is stretched tightly and attached to an aluminum frame by using glue to obtain a stretched screen;

[0066] S2, steel wire removal: a laser device is used to remove the steel wire on the stretched screen according to a design drawing to obtain a screen with removed steel wire;

[0067] S3, cleaning: a degreasing agent is applied to the screen with removed steel wire and brushed to remove oil from the steel wire;

[0068] S4, film pasting: a PI film with a thickness of 3.5 μm is pasted on the surface of the screen after oil removal;

[0069] S5, laser engraving: laser engraving is performed on the screen with pasted PI film;

[0070] S6, surface spraying: a surface nano-spraying technology is used to spray a layer of surface material on the surface of the screen, and the screen is naturally dried and then baked for 40 min at a temperature of 40℃, so that a uniform layer is formed on the surface of the screen to fill the cutting marks, and the spraying thickness of the surface material is 100 nm;

[0071] S7, screen inspection: the screen with PI film after laser engraving is inspected;

[0072] S8, packaging: the qualified screen is packaged.

[0073] The stainless steel wire screen is purchased from Japan ASADA.

[0074] The preparation raw materials of the degreasing agent are dodecanol polyoxyethylene ether, ethanol and water, and the mass ratio of dodecanol polyoxyethylene ether, ethanol and water is 1:6:25; the amount of the degreasing agent is 0.12 g / cm2 according to the area of the stainless steel wire screen. 2 .

[0075] The preparation raw materials of the surface material are 55% acrylate monomer, 10% acrylate organic silicon monomer, 3% additive, 1% initiator and 31% organic solvent according to the mass percentage.

[0076] The acrylic ester monomer is 2-methyl methacrylate (CAS number: 80-62-6); the acrylic ester silicone monomer is triisopropylsilyl acrylate (CAS number: 157859-20-6) and a silicone-modified acrylic ester monomer, and the mass ratio is 1:1.5; the silicone-modified acrylic ester monomer is SJ-804 silicone epoxy-modified acrylic resin, which is purchased from Jining Tangyi Chemical Co., Ltd.; the auxiliary agent is a leveling agent and a defoaming agent, and the mass ratio of the leveling agent to the defoaming agent is 3:2; the leveling agent is a fast leveling agent Dowsen FL21F; the defoaming agent is a silicone defoaming agent and an organic fluorine defoaming agent, and the mass ratio is 1:1.5; the silicone defoaming agent is a silicone polyether defoaming agent F-521, which is purchased from Shanghai Fexier Industrial Technology Co., Ltd.; the organic fluorine defoaming agent is a fluorosilicon-modified defoaming agent, which is purchased from Hangzhou Baolide Silicone Co., Ltd.; the initiator is azobisisobutyronitrile (CAS number: 78-67-1); the organic solvent is ethyl acetate (CAS number: 141-78-6); and the spraying thickness of the surface material is 1.5 μm.

[0077] The second aspect of the embodiment provides an application of the screen surface spraying treatment process, which is applied in the production and manufacturing of solar photovoltaic cells.

[0078] Example 3

[0079] The first aspect of the embodiment provides a screen surface spraying treatment process, and the specific process steps are as follows:

[0080] S1, screen stretching: a 520-mesh stainless steel wire screen is stretched tightly and attached to an aluminum frame by using glue to obtain a stretched screen;

[0081] S2, steel wire removal: a laser device is used to remove the steel wire on the stretched screen according to a design drawing to obtain a screen with removed steel wire;

[0082] S3, cleaning: a degreasing agent is applied to the screen with removed steel wire and brushed to remove oil from the steel wire;

[0083] S4, film pasting: a PI film is pasted on the surface of the screen after oil removal, and the thickness of the PI film is 3.5 μm;

[0084] S5, laser engraving: laser engraving is performed on the screen with pasted PI film;

[0085] S6, surface spraying: a surface nano-spraying technology is used to spray a layer of surface material on the surface of the screen, and then natural air drying and drying are performed; the drying time is 55 min, the drying temperature is 55 ℃, and after drying, a uniform layer is formed on the surface of the screen, the cutting marks are filled, and the spraying thickness of the surface material is 1.5 μm;

[0086] S7, Screen inspection: inspect the screen after laser and PI film;

[0087] S8, Packaging: package the qualified screen.

[0088] The stainless steel wire mesh is purchased from Japan ASADA.

[0089] The preparation raw materials of the degreasing agent are dodecanol polyoxyethylene ether, ethanol, and water, with a mass ratio of 3:9:30; the amount of the degreasing agent is 0.12 g / cm2 according to the area of the stainless steel wire mesh. 2 .

[0090] The preparation raw materials of the surface material are 62% acrylate monomer, 14% acrylate silicone monomer, 4% auxiliary agent, 1.5% initiator, and 18.5% organic solvent.

[0091] The acrylate monomer is 2-methyl methacrylate (CAS number: 80-62-6); the acrylate silicone monomer is triisopropylsilyl acrylate (CAS number: 157859-20-6) and silicone-modified acrylate monomer, with a mass ratio of 1:1.5; the silicone-modified acrylate monomer is SJ-804 silicone epoxy-modified acrylic resin, purchased from Jining Tangyi Chemical Co., Ltd.; the auxiliary agent is a leveling agent and a defoaming agent, with a mass ratio of 3:2; the leveling agent is a fast leveling agent Dowsen FL21F; the defoaming agent is a silicone defoaming agent and an organic fluorine defoaming agent, with a mass ratio of 1:1.5; the silicone defoaming agent is a silicone polyether defoaming agent F-521, purchased from Shanghai Fexier Industrial Technology Co., Ltd.; the organic fluorine defoaming agent is a fluorosilicon-modified defoaming agent, purchased from Hangzhou Baolide Silicone Co., Ltd.; the initiator is azobisdimethylisobutyronitrile (CAS number: 78-67-1); the organic solvent is ethyl acetate (CAS number: 141-78-6); the spraying thickness of the surface material is 1.5 μm.

[0092] The second aspect of the embodiment provides an application of a screen surface spraying treatment process, which is applied in the production and manufacturing of solar photovoltaic cells.

[0093] Comparative Example 1

[0094] The first aspect of the embodiment provides a screen surface spraying treatment process, and the specific process steps are as follows:

[0095] S1, screen stretching: stretch the 520-mesh stainless steel wire mesh tightly and paste it on an aluminum frame using glue to obtain a stretched screen;

[0096] S2, removing steel wire: using laser equipment to remove the steel wire on the stretched screen according to the design drawing, thereby obtaining a screen with removed steel wire;

[0097] S3, cleaning: applying the degreasing agent to the screen with removed steel wire and brushing to remove oil from the steel wire;

[0098] S4, film pasting: pasting PI film on the surface of the screen after cleaning and removing oil, wherein the thickness of the PI film is 3.5 μm;

[0099] S5, laser engraving: performing laser engraving on the screen with pasted PI film;

[0100] S6, screen inspection: inspecting the screen with PI film after laser engraving;

[0101] S7, packaging: packaging the qualified screen.

[0102] The stainless steel wire screen is purchased from Japan ASADA.

[0103] The preparation raw materials of the degreasing agent are dodecanol polyoxyethylene ether, ethanol and water, and the mass ratio of dodecanol polyoxyethylene ether, ethanol and water is 2:7:30; the amount of the degreasing agent is 0.12 g / cm according to the area of the stainless steel wire screen. 2 .

[0104] Comparative Example 2

[0105] The first aspect of the present comparative example provides a screen surface spraying treatment process, and the specific process steps are as follows:

[0106] S1, stretching screen: stretching the 520-mesh stainless steel wire screen and pasting it on an aluminum frame using glue to obtain a stretched screen;

[0107] S2, removing steel wire: using laser equipment to remove the steel wire on the stretched screen according to the design drawing, thereby obtaining a screen with removed steel wire;

[0108] S3, cleaning: applying the degreasing agent to the screen with removed steel wire and brushing to remove oil from the steel wire;

[0109] S4, film pasting: pasting PI film on the surface of the screen after cleaning and removing oil, wherein the thickness of the PI film is 3.5 μm;

[0110] S5, laser engraving: performing laser engraving on the screen with pasted PI film;

[0111] S6, surface spraying: the surface nanometer spraying technology is used to spray a layer of surface material on the screen surface, and then natural air drying and drying are performed, the drying time is 45 min, the drying temperature is 50 DEG C, and after drying, a uniform layer is formed on the screen surface, the cutting trace is filled, and the spraying thickness of the surface material is 100 nm;

[0112] S7, screen inspection: the screen of the PI film after laser is inspected;

[0113] S8, packaging: the qualified screen is packaged.

[0114] The stainless steel wire screen is purchased from Japan ASADA.

[0115] The preparation raw materials of the degreasing agent are dodecanol polyoxyethylene ether, ethanol and water, and the mass ratio of dodecanol polyoxyethylene ether, ethanol and water is 2:7:30; the amount of the degreasing agent is 0.12 g / cm according to the area of the stainless steel wire screen. 2 .

[0116] The preparation raw materials of the surface material are 70% acrylate monomer, 4% additive, 1.2% initiator and 24.8% organic solvent according to the mass percentage.

[0117] The acrylate monomer is 2-methyl methacrylate (CAS number: 80-62-6); the additive is a leveling agent and a defoaming agent, and the mass ratio of the leveling agent and the defoaming agent is 3:2; the leveling agent is a fast leveling agent Dowsen FL21F; the defoaming agent is an organic silicon defoaming agent and an organic fluorine defoaming agent; the mass ratio is 1:1.5, the organic silicon defoaming agent is an organic silicon polyether defoaming agent F-521, which is purchased from Shanghai Fexier Industrial Technology Co., Ltd.; the organic fluorine defoaming agent is a fluorosilicon modified defoaming agent, which is purchased from Hangzhou Baolide Silicone Co., Ltd.; the initiator is azobisisobutyronitrile (CAS number: 78-67-1); the organic solvent is ethyl acetate (CAS number: 141-78-6); and the spraying thickness of the surface material is 1.5 μm.

[0118] Performance test

[0119] 1, conductive silver paste line width test

[0120] Test object: Example 1-3, Comparative Example 1-2, sprayed film stainless steel wire screen

[0121] Test method: the conductive silver paste of the downstream manufacturer is sprayed on the film stainless steel wire screen, a 3D profile instrument is used to measure the silver paste line width, and the test results are recorded in Table 1

[0122] 2, conductive silver paste break test

[0123] Test object: coated stainless steel wire mesh after spray treatment of Examples 1-3, Comparative Examples 1-2

[0124] Test method: Spray the conductive silver paste of the downstream manufacturer on the coated stainless steel wire mesh, visually observe whether the silver paste appears broken grid phenomenon, and record the test results in Table 1

[0125] 3. Test of conductive silver paste adhesion

[0126] Test object: coated stainless steel wire mesh after spray treatment of Examples 1-3, Comparative Examples 1-2

[0127] Test method: refer to GB / T 9286-1998, and record the test results in Table 1

[0128] Table 1

[0129] Line width test Break test Adhesion performance Example 1 13 mm No break Grade 1 Example 2 13 mm No break Grade 1 Example 3 13 mm No break Grade 1 Comparative Example 1 16 mm Break occurred Grade 3 Comparative Example 2 14 mm No break Grade 2

Claims

1. A screen surface spray treatment process characterized by: At least comprising the following steps: S1, tighten the net: tighten the stainless steel wire net, use glue to paste on the aluminum frame, get the tightened screen; S2, remove the steel wire: use laser equipment to remove the steel wire on the tightened screen according to the design drawing, that is, get the screen without steel wire; S3, cleaning: apply degreasing agent to the screen without steel wire and brush it, remove oil from the steel wire; S4, paste film: paste PI film on the surface of the screen after cleaning and removing oil; S5, laser engraving: laser engraving on the screen with PI film; S6, surface spraying: through surface nano spraying technology, spray a layer of surface material on the surface of the screen after laser engraving, naturally dry and then dry, form a uniform coating on the surface of the screen after drying, fill in the cutting marks; S7, screen inspection: inspect whether the screen after surface spraying is qualified; S8, packaging: package the qualified screen; The preparation raw materials of the surface material at least include: 40-70% acrylate monomer, 10-20% acrylate silicone monomer, 3-5% additive, 0.8-1.5% initiator, 10-45% organic solvent.

2. A screen surface spray treatment process according to claim 1, characterised in that: The degreasing agent at least includes organic components and inorganic components.

3. A screen surface spray treatment process according to claim 2, wherein: The organic components at least include dodecanol polyoxyethylene ether and ethanol; the inorganic components at least include water.

4. A screen surface spray treatment process according to claim 3, wherein: The mass ratio of dodecanol polyoxyethylene ether, ethanol and water is (1-3):(5-9):(20-40).

5. A screen surface spray treatment process according to claim 1 wherein: The thickness of PI film in S4 step is 2.5-5.0 μm.

6. A screen surface spray treatment process according to claim 5, wherein: The drying time in S6 step is 30-60 min, and the drying temperature is 40-60℃.

7. A screen surface spray treatment process according to claim 1 wherein: The acrylate monomer at least includes one of methyl acrylate, ethyl acrylate, n-butyl acrylate, hydroxyethyl acrylate, 2-methyl methacrylate, 2-methyl acrylate, 2-methyl n-butyl acrylate and 2-methyl hydroxyethyl acrylate; the acrylate silicone monomer includes triisopropyl silyl acrylate and silicone modified acrylate monomer; the additive is leveling agent and defoaming agent; the leveling agent is fast leveling agent; the defoaming agent at least includes silicone defoaming agent and organic fluorine defoaming agent.

8. A screen surface spray treatment process according to claim 7, wherein: The mass ratio of triisopropyl silyl acrylate and silicone modified acrylate monomer is 1:(1.2-1.5); the mass ratio of silicone defoaming agent and organic fluorine defoaming agent is 1:(1.5-2).

9. Use of a screen surface spray treatment process according to any one of claims 1-8, characterized in that: The screen surface spraying process is applied in the production and manufacturing of solar photovoltaic cells.

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