WO2022252755A1

WO2022252755A1 - Ribbon carrier film, preparation method therefor, and application thereof

Info

Publication number: WO2022252755A1
Application number: PCT/CN2022/081620
Authority: WO
Inventors: 韩晓航; 王磊; 胡求学; 李新军; 陈洪野; 吴小平
Original assignee: 苏州赛伍应用技术股份有限公司
Priority date: 2021-06-03
Filing date: 2022-03-18
Publication date: 2022-12-08
Also published as: CN113563812A

Abstract

Disclosed are a ribbon carrier film, a preparation method therefor, and an application thereof, the ribbon carrier film comprising a pre-crosslinked layer and a bonding layer, the matrix resin of the pre-crosslinked layer and the bonding layer being the same, the matrix resin being one or more of ethylene-vinyl acetate copolymer, polyolefin elastomer, ethylene acrylic acid copolymer, or ethyl methacrylate, the pre-crosslinking degree of the pre-crosslinked layer being 30-80%, the pre-crosslinking degree of the bonding layer being ≤1% and, after the ribbon carrier film is prepared into a photovoltaic module, the cross-linking degree of the bonding layer being 50-90%. The ribbon carrier film of the present application can be fused into one after being laminated, has no risk of delamination failure, and can avoid the risk of failure caused by the hot spot effect during use of the component; the overall material transmittance is high and haze is low, and the bonding layer reacts chemically during the process of being laminated with a battery plate, thereby increasing the bonding force between the carrier film and the battery plate, and further improving the long-term reliability of the product.

Description

A kind of welding tape carrier film, its preparation method and application

technical field

The embodiment of the present application relates to a solder tape carrier film, its preparation method and its application.

Background technique

At present, the development trend of photovoltaic industry components is from 3 busbars to 4 busbars, 5 busbars, and recently developed into the current multi-busbar. In recent years, busbar-free components have been proposed, which can save the amount of silver and reduce the shielding of the grid lines on the cells, and improve the power generation efficiency, such as the electrode interconnection structure of Taizhou Longji Solar CN201720080886.4 IBC battery, CN201710054876.8 an N-type Double-sided battery interconnection process; Shenzhen Laplace Energy Technology Co., Ltd. CN201720292907.9 Busbar-free solar cell module.

At present, there are two ways to fix the wires of the battery sheet without busbar components on the battery sheet: 1. By electroplating process, such as Suzhou Sunwell New Energy Co., Ltd., CN201820959124.6 A double-sided electroplating metallized solar cell sheet without busbar ; 2. Carry the wire through an adhesive film and fix it on the battery sheet during lamination, such as Huanghe Hydropower Photovoltaic Industry Technology Co., Ltd. CN201510933299.0 A preparation method for a busbar-free ribbon for solar cells.

At this stage, for conventional multi-layer adhesive film products, the general support layer is a crystalline polymer with a higher melting point, so as to ensure that the product will not bond with the equipment during the bonding process of the product and the battery sheet, and at the same time prevent lamination. During the process, the position of the solder strip is shifted; the bonding layer is a material with a lower melting point to ensure adhesion; the support layer material of this scheme is different from the packaging material, the performance is quite different, and the bonding with the packaging material is poor. At the same time, there is a large difference in modulus between the upper and lower layers of materials, and there is a certain difference in thermal expansion coefficient. During the use of the product, due to changes in the use environment, the welding ribbon may be pulled, causing the welding ribbon to detach from the electrode and affecting the power generation efficiency; at the same time, the crystalline support layer The light transmittance is relatively low, and the haze is relatively large, which also has a certain impact on the power generation efficiency.

Contents of the invention

The following is an overview of the topics described in detail in this article. This summary is not intended to limit the scope of the claims.

The present application provides a solder ribbon carrier film that is not easy to delaminate, has good temperature resistance, high transmittance and low haze.

The technical scheme that the embodiment of the present application adopts is:

On the one hand, the embodiment of the present application provides a carrier film for solder tape, which includes a pre-crosslinked layer and an adhesive layer, the pre-crosslinked layer is the same as the matrix resin of the adhesive layer, and the matrix resin is ethylene- One or more of vinyl acetate copolymer (EVA), polyolefin elastomer (POE), ethylene acrylic acid copolymer (EAA), or ethyl methacrylate (EMA), the pre-crosslinked layer The degree of cross-linking is 30% to 80%, and the pre-cross-linking degree of the adhesive layer is ≤1%;

Moreover, after the ribbon carrier film is prepared into a photovoltaic module, the crosslinking degree of the adhesive layer is 50%-90%.

In the present application, the pre-crosslinking refers to the degree of crosslinking of each layer in the finished ribbon carrier film.

In the present application, the cross-linking degree refers to the cross-linking degree of the bonding layer in the finished photovoltaic module obtained by using the finished ribbon carrier film to prepare a photovoltaic module.

Preferably, the degree of pre-crosslinking of the adhesive layer is zero, that is, in the finished product of the ribbon carrier film, the adhesive layer is not crosslinked.

Further preferably, the pre-crosslinking degree of the pre-crosslinked layer is 30%-60%, more preferably 40%-50%.

Further preferably, the degree of crosslinking of the adhesive layer is 65%-90%, more preferably 75%-90%.

Preferably, the added amount of the matrix resin in the pre-crosslinked layer is 60%-98% of the total mass of the raw materials of the pre-crosslinked layer, more preferably 70%-98%, more preferably 80% ~95%.

Preferably, the raw materials of the pre-crosslinked layer also include a cross-linking agent added in an amount of 1% to 8% of the total mass of the raw material formulation of the pre-crosslinked layer, more preferably 2% to 6%, more preferably 3% to 5%.

Preferably, the raw material of the pre-crosslinked layer also includes an ultraviolet photoinitiator added in an amount of 0.1 to 5% of the total mass of the raw material formulation of the pre-crosslinked layer, more preferably 1% to 5%, more preferably 1% to 3%.

Preferably, the addition amount of the matrix resin in the bonding layer is 50-98% of the total mass of the raw materials of the bonding layer, more preferably 60%-98%, more preferably 70%-95% %.

Preferably, the raw material of the adhesive layer also includes a crosslinking agent added in an amount of 1-8% of the total mass of the raw material of the adhesive layer, more preferably 1%-6%, more preferably 2%-4% %.

Preferably, the raw material of the bonding layer also includes a thermal initiator in an amount of 0.1% to 5% of the total mass of the raw material of the bonding layer, more preferably 1% to 5%, more preferably 1% to 3%.

Under normal processing temperature (usually 80 ℃ ~ 130 ℃) and high temperature lamination within a short period of time (within 1 minute), the adhesive layer will not be cross-linked, and the lamination temperature is usually above 130 ℃, the layer The pressing time is more than 5 minutes, which can cause the cross-linking reaction of the adhesive layer.

In some embodiments, the raw material of the adhesive layer further includes an ultraviolet photoinitiator, and based on the total mass of the raw material of the adhesive layer as 100%, the added amount of the ultraviolet light additive is ≤0.1%. A small amount of ultraviolet photoinitiator may be included in the raw materials of the adhesive layer, as long as the pre-crosslinking degree of the adhesive layer is guaranteed to be ≤ 1%.

Further preferably, the raw material of the pre-crosslinked layer also includes an anti-aging agent added in an amount of 0.1% to 3% of the total mass of the raw material formulation of the pre-crosslinked layer, still more preferably 0.5% to 3%, and more preferably Preferably it is 0.8% to 2%.

Further preferably, the raw material of the bonding layer also includes a coupling agent added in an amount of 0.1% to 2% of the total mass of the raw material of the bonding layer, still more preferably 0.1% to 1%, more preferably 0.3% % to 0.8%.

Further preferably, the raw material of the bonding layer also includes an anti-aging agent added in an amount of 0.1% to 3% of the total mass of the raw material of the bonding layer, still more preferably 0.1% to 1%, more preferably 0.3% % to 0.8%.

More preferably, the raw material of the pre-crosslinked layer also includes a tackifying resin added in an amount of 0.1% to 20% of the total mass of the raw material formulation of the pre-crosslinked layer, more preferably 5% to 15%, More preferably, it is 8% to 12%.

More preferably, the raw materials of the pre-crosslinked layer also include a coupling agent added in an amount of 0.005% to 2% of the total mass of the raw material formulation of the pre-crosslinked layer, still more preferably 0.01% to 1%, More preferably, it is 0.1%-0.5%.

More preferably, the raw material of the pre-crosslinked layer also includes a processing aid added in an amount of 0.001% to 1% of the total mass of the raw material formulation of the precrosslinked layer, still more preferably 0.05% to 1%, More preferably, it is 0.1% to 1%.

More preferably, the raw material of the pre-crosslinked layer also includes an anti-PID additive in an amount of 0.005% to 5% of the total mass of the raw material formulation of the precrosslinked layer, and further preferably 0.1% to 5%. , more preferably 0.1% to 1.5%.

More preferably, the raw material of the adhesive layer also includes a tackifying resin added in an amount of 0.1% to 30% of the total mass of the raw material of the adhesive layer, still more preferably 10% to 30%, more preferably 15% to 25%.

More preferably, the raw material of the adhesive layer also includes a processing aid added in an amount of 0.001% to 1% of the total mass of the raw material of the adhesive layer, still more preferably 0.1% to 1%, more preferably 0.3% to 0.8%.

More preferably, the raw material of the bonding layer also includes an anti-PID additive in an amount of 0.005% to 5% of the total mass of the raw material of the bonding layer, further preferably 0.1% to 5%, more preferably 1% to 5%.

Further preferably, the crosslinking agent is triallyl isocyanurate (TAIC), trimethallyl isocyanate (TMAIC), trimethylolpropane triacrylate (TMPTA), trimethylolpropane One or more of trimethacrylate (TMPTMA) or pentaerythritol triacrylate (PETA).

Further preferably, the ultraviolet photoinitiator is one or more of trimethylolpropane triacrylate, 2-trimethylolpropane tetraacrylate, 4-(dimethylamino) ethyl benzoate .

Further preferably, the thermal initiator is a peroxide initiator.

More preferably, the thermal initiator is ethoxylated trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, dicumyl peroxide One or more of (DCP), 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.

Further preferably, the tackifying resin is one or more of rosin, hydrogenated rosin, petroleum resin, hydrogenated petroleum resin, phenolic resin, or terpene resin.

Further preferably, the coupling agent is one or more of a silane coupling agent, a titanate coupling agent, or an aluminate coupling agent.

More preferably, the coupling agent is selected from 3-methacryloxypropylmethyltrimethoxysilane, 3-glycidylpropyltrimethoxysilane, vinyltrimethoxysilane, 3 - one of aminopropyltriethoxysilane, vinyltrimethoxysilane, isopropyl triisostearyl titanate, isopropyl tris (dioctyl pyrophosphate acyloxy) titanate or Various.

Further preferably, the anti-aging agent includes one or more of antioxidants, light stabilizers, or ultraviolet absorbers.

Even more preferably, the antioxidant is one or more of phenolic antioxidants, phosphite antioxidants and hindered amine antioxidants.

More preferably, the light stabilizer is selected from bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate (light stabilizer 770), polysuccinic acid ( 4-Hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol) ester, poly-{[6-[(1,1,3,3-tetramethylbutyl)-imino] -1,3,5-triazine-2,4-diyl][2-(2,2,6,6-tetramethylpiperidinyl)-nitro]-hexylene-[4-(2 , 2,6,6-tetramethylpiperidinyl)-amino] in one or more.

Further preferably, the processing aid is an antiblocking agent and/or a lubricant.

Even more preferably, the anti-PID additive is a metal ion scavenger.

Preferably, the thickness of the pre-crosslinked layer is 20-200 μm, more preferably 20-100 μm, still more preferably 20-80 μm, still more preferably 20-50 μm.

Preferably, the adhesive layer has a thickness of 20-200 μm, more preferably 20-100 μm, still more preferably 20-80 μm, and still more preferably 20-50 μm.

Preferably, a release film is provided on the outside of the pre-crosslinked layer.

Further preferably, the release film is a conventional release film, such as PE, PP, PET, etc., and the release film can be colored or colorless.

Preferably, the tape carrier film further includes one or more transition layers disposed between the pre-crosslinked layer and the adhesive layer, and the matrix resin includes ethylene-vinyl acetate copolymer, polyolefin One or more of elastomer, ethylene acrylic acid copolymer, or ethyl methacrylate, the transition layer is cross-linked or non-cross-linked, when the transition layer is cross-linked, the The pre-crosslinking degree of the transition layer is ≤1%, and after the ribbon carrier film is prepared into a photovoltaic module, the crosslinking degree of the transition layer is 1-90%.

In the present application, the pre-crosslinking degree of the transition layer also refers to the crosslinking degree of the transition layer in the finished product of the ribbon carrier film obtained.

Further preferably, the raw material of the transition layer includes a matrix resin added in an amount of 50% to 98% of the total mass of the raw material of the transition layer, more preferably 80% to 98%, more preferably 85% to 95% .

Further preferably, the raw material of the transition layer includes a crosslinking agent added in an amount of 1% to 8% of the total mass of the raw material of the transition layer, more preferably 1% to 8%, more preferably 2% to 5%. %.

Further preferably, the raw material of the transition layer includes a thermal initiator added in an amount of 0.1% to 5% of the total mass of the raw material of the transition layer, more preferably 0.1% to 5%, more preferably 0.5% to 3% .

In some embodiments, the raw material of the transition layer also includes an ultraviolet photoinitiator, based on the total mass of the raw material of the transition layer as 100%, the addition amount of the ultraviolet light additive is ≤0.1%, and the addition amount of the transition layer is ≤0.1%. The raw material may also include a small amount of ultraviolet photoinitiator, as long as the pre-crosslinking degree of the transition layer is guaranteed to be ≤1%.

Further preferably, the ultraviolet photoinitiator is one or more of trimethylolpropane triacrylate, 2-trimethylolpropane tetraacrylate, and ethyl 4-(dimethylamino)benzoate.

Still further preferably, the raw material of the transition layer also includes a tackifying resin added in an amount of 0.1% to 30% of the total mass of the raw material of the transition layer, still more preferably 10% to 30%, more preferably 15% ~25%.

Still further preferably, the raw material of the transition layer includes a coupling agent added in an amount of 0.1% to 2% of the total mass of the raw material of the transition layer, more preferably 0.1% to 1%, more preferably 0.5% to 1% %.

Still further preferably, the raw material of the transition layer includes an anti-aging agent added in an amount of 0.1% to 3% of the total mass of the raw material of the transition layer, more preferably 0.1% to 3%, more preferably 0.1% to 2% %.

Still further preferably, the raw material of the transition layer also includes a processing aid added in an amount of 0.001% to 1% of the total mass of the raw material of the transition layer, more preferably 0.1% to 1%, more preferably 0.1% ~0.6%.

Still further preferably, the raw material of the transition layer also includes an anti-PID additive in an amount of 0.005% to 5% of the total mass of the raw material of the transition layer, more preferably 0.1% to 5%, more preferably 0.1% %~3%.

The matrix resin of the transition layer is one or more of ethylene-vinyl acetate copolymer, polyolefin elastomer, ethylene acrylic acid copolymer, or ethyl methacrylate. In this application, the basic composition of the transition layer and the adhesive layer is similar, and the matrix resin is the same or different.

Further preferably, the thermal initiator is ethoxylated trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, dicumyl peroxide, One or more of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane.

Further preferably, the crosslinking agent is triallyl isocyanurate (TAIC), trimethallyl isocyanate (TMAIC), trimethylol propane triacrylate (TMPTA), trimethylolpropane trimethyl One or more of pentaerythritol triacrylate (PETA) or pentaerythritol triacrylate (TMPTMA).

Further preferably, the anti-aging agent is one or more of antioxidants, light stabilizers, or ultraviolet absorbers.

In the second aspect, the embodiment of the present application also provides a preparation method of the above-mentioned welding tape carrier film. The raw materials of each layer are mixed and granulated respectively, and then multi-layer co-extrusion casting is performed to form a film, and the film is irradiated by UV or electron beam pre-crosslinked layer.

Preferably, the electron beam irradiation dose is 10-25 kGy.

In a third aspect, the embodiment of the present application is also a solder ribbon composite, including the solder ribbon carrier film, and a solder ribbon adhered to the solder ribbon carrier film.

Preferably, at least 30% or more of the volume of the solder ribbon is exposed to the ribbon carrier film, so that the solder ribbon can be in good contact with the battery sheet while ensuring the bonding performance of the solder ribbon and the carrier film.

Further preferably, 30% to 70% of the volume of the welding ribbon exposes the welding ribbon carrier film, more preferably 40% to 60% of the volume of the welding ribbon exposes the welding ribbon carrier film .

In the fourth aspect, the embodiment of the present application also provides a preparation method of the solder ribbon complex, specifically: controlling the temperature at 80°C to 170°C, and adhering the solder ribbon to the solder ribbon by pressing On the carrier film, the pressing time is controlled to be 0.1s-1s, and the two adjacent carrier films are respectively located on both sides of the welding strip and distributed at intervals.

Preferably, the controlled temperature is 80°C-150°C, more preferably 80°C-130°C.

In the fifth aspect, the embodiment of the present application also provides a battery sheet composite, including a battery sheet, a welding ribbon in contact with the battery sheet, and a carrier for fixing the welding ribbon on the battery sheet film, the carrier film is the carrier film of the solder tape.

Preferably, the two sides of the cell sheet are respectively provided with the solder strip and the carrier film.

Further preferably, the cell is one of crystalline silicon cells, amorphous silicon cells, chemical solar cells, multi-component compound thin film solar cells, and the like.

In the sixth aspect, the embodiment of the present application also provides a method for preparing a cell composite, which specifically includes:

cutting the ribbon attached to the carrier film to form a ribbon complex unit, the ribbon composite unit is composed of the ribbon and two carrier films,

The temperature is controlled at 100° C. to 300° C., and the ribbon composite unit is pressed on the surface of the battery sheet, and the pressing time is controlled to be 0.2s to 3s.

Preferably, the controlled temperature is 100°C-200°C, more preferably 100°C-150°C, more preferably 100°C-130°C.

In a seventh aspect, the embodiment of the present application also provides an application of the ribbon carrier film, or the ribbon composite, or the cell assembly in a photovoltaic module.

In the eighth aspect, the embodiment of the present application also provides a method for preparing a photovoltaic module, specifically:

Laminate the back sheet, the lower layer of adhesive film, the cell complex, the upper layer of adhesive film, and the glass in sequence, and place them in a laminator to obtain a single-glass solar module.

Or stack the lower glass, the lower adhesive film, the cell complex, the upper adhesive film, and the upper glass in sequence, and place them in a laminator to obtain a double-glass solar module.

The lamination conditions are: lamination temperature 120°C-180°C, vacuum time 3-8min, lamination time 8-20min; the lamination temperature is further preferably 130°C-180°C, more preferably 135°C ~150°C.

Preferably, when a release film is provided on the carrier film, the release film is removed before lamination.

Due to the application of the above-mentioned technical solutions, the embodiment of the present application has the following advantages compared with related technologies:

In the embodiment of the present application, by optimizing the raw material formula of each layer of the carrier film, the compatibility between adjacent two layers is good, and they can be melted into one after lamination, without the risk of delamination failure; the failure caused by temperature changes during use is avoided. Risk; each layer is made of amorphous material, which has good compatibility with the packaging material, high transmittance of the overall material, low haze, and the same material as the packaging film, so the thickness of the packaging material can be reduced as appropriate to further reduce the component cost; at the same time Both the pre-crosslinked layer and the adhesive layer are cross-linked, which avoids the risk of failure due to the hot spot effect during the use of the module; the chemical reaction between the adhesive layer and the battery sheet will occur during the lamination process, which increases the carrier film and the battery. The adhesion between the cells further enhances the long-term reliability of the product.

Other aspects will be apparent to others upon reading and understanding the drawings and detailed description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solutions herein, and constitute a part of the description, and are used together with the embodiments of the application to explain the technical solutions herein, and do not constitute limitations to the technical solutions herein.

Accompanying drawing 1 is a kind of structural representation of the carrier film of the welding tape of the embodiment of the present application;

Accompanying drawing 2 is the second structure schematic diagram of the carrier film of the welding tape of the embodiment of the present application;

Accompanying drawing 3 is the third structure schematic diagram of the carrier film of the welding tape of the embodiment of the present application;

Among them, 1. Release film; 2. Pre-crosslinked layer; 3. Adhesive layer; 4. Transition layer.

Detailed ways

The present application will be further described below in conjunction with specific examples, but the present application is not limited to the following examples. The implementation conditions adopted in the examples can be further adjusted according to the different requirements of specific use, and the implementation conditions not indicated are the conventional conditions in this industry.

The parts of the raw materials in the following examples and comparative examples are all parts by mass.

The raw materials in the following examples and comparative examples are obtained commercially or by self-made.

POE resin: Dow 8450;

EVA resin: Hanwha 282;

Tackifying resin: Arakawa Chemical PR12603;

UV photoinitiator: BASF 1173;

Thermal Initiator: Arkema

TAEC;

Cross-linking agent: Sartomer SR454NS;

Coupling agent: Anhui Sibao GX171;

Anti-aging additive: Cytec B877;

Processing aid: 3M FX5920;

The anti-PID auxiliary agent is self-made according to the method of related technology.

Backplane: Cynagard 205A;

Upper film: Cybright T11;

Lower film: Cybright C11.

Example 1

The welding tape carrier film with structure as shown in accompanying drawing 1:

Release film layer: PET material, thickness 25μm

The raw material formula of the pre-crosslinking layer is: 92.5 parts of POE resin, 1 part of ultraviolet photoinitiator, 4 parts of crosslinking agent, 0.2 part of coupling agent, 1 part of anti-aging additive, 0.8 part of processing aid, and 0.5 part of anti-PID additive .

The raw material formula of the bonding layer is: 93 parts of POE resin, 1 part of thermal initiator, 3.5 parts of crosslinking agent, 0.5 part of coupling agent, 0.5 part of anti-aging additive, 0.5 part of processing aid, and 1 part of anti-PID additive.

Preparation method of ribbon carrier film:

The raw materials of each layer are mixed uniformly in a high-speed mixer, and then granulated by a twin-screw extruder to complete, and then multi-layer co-extrusion casting is performed to form a film, and the film is cast and laminated with a release film at the same time. Pre-crosslinking by electron beam irradiation is carried out after completion. The processing temperature is 80-100°C, and the electron beam irradiation dose is 16kGy. Form a three-layer structure of the welding tape carrier film, the release film is 1 25 μm, the pre-crosslinked layer is 2 40 μm, and the adhesive layer is 3 40 μm.

Preparation of photovoltaic modules:

Step 1. Control the temperature at 80-130°C, adhere the welding ribbon to the carrier film by pressing, control the pressing time to 0.1-1s, and the two adjacent carrier films are respectively located on both sides of the welding ribbon and spaced apart distributed;

Step 2, cutting the welding ribbon adhered to the carrier film to form a welding ribbon composite unit, the welding ribbon composite unit is composed of a welding ribbon and two carrier films;

Step 3. Control the temperature at 100-130°C, and press the ribbon composite unit on the surface of the battery sheet to form a battery sheet composite. The pressing time is controlled to be 0.2-3s, and the two sides of the battery sheet are respectively pressed with ribbons. complex unit;

Step 4. Laminate the back sheet, the lower layer of adhesive film, the cell complex, the upper layer of adhesive film, and the glass in sequence, and place them in a laminator to obtain a single-glass solar module.

Alternatively, the lower layer of glass, the lower layer of adhesive film, the cell complex, the upper layer of adhesive film, and the upper layer of glass are sequentially laminated, and placed in a laminator for lamination to obtain a double-glass solar module.

The lamination temperature is 145°C, the vacuum time is 3-8 minutes, and the lamination time is 15 minutes.

Example 2

Release film layer: PET material, thickness 25μm

The raw material formula of the pre-crosslinking layer is: 92.5 parts of EVA resin, 1.5 parts of ultraviolet photoinitiator, 3.5 parts of crosslinking agent, 0.2 part of coupling agent, 1 part of anti-aging additive, 0.3 part of processing aid, and 1 part of anti-PID additive .

The raw material formula of the adhesive layer is: 91.2 parts of EVA resin, 1.5 parts of thermal initiator, 3 parts of crosslinking agent, 0.5 part of coupling agent, 0.5 part of anti-aging additive, 0.3 part of processing aid, and 3 parts of anti-PID additive.

The preparation method of the ribbon carrier film is the same as in Example 1.

Form a three-layer structure of the welding tape carrier film, the release film is 1 25 μm, the pre-crosslinked layer is 2 40 μm, and the adhesive layer is 3 40 μm.

The preparation of the photovoltaic module is the same as in Example 1.

Example 3

Release film layer: PET material, thickness 25μm

The raw material formula of the pre-crosslinked layer is: 81 parts of POE resin, 10 parts of tackifying resin, 2 parts of ultraviolet photoinitiator, 4.5 parts of crosslinking agent, 0.2 part of coupling agent, 1 part of anti-aging additive, 0.8 part of processing aid, 0.5 part of anti-PID auxiliary agent.

The raw material formula of the bonding layer is: 71.5 parts of POE resin, 20 parts of tackifying resin, 2 parts of thermal initiator, 4 parts of crosslinking agent, 0.5 part of coupling agent, 0.5 part of anti-aging additive, 0.5 part of processing aid, anti-PID 1 part of auxiliary agent.

The preparation method of the ribbon carrier film is the same as in Example 1.

The preparation method of the photovoltaic module is the same as that in Example 1.

Example 4

The ribbon carrier film with structure as shown in accompanying drawing 3:

Release film layer: PET material, thickness 25μm.

The raw material formula of the transition layer is: 93.5 parts of POE resin, 1 part of thermal initiator, 3.5 parts of crosslinking agent, 0.5 part of anti-aging additive, 0.5 part of processing aid, and 1 part of anti-PID additive.

The preparation method of the ribbon carrier film is the same as in Example 1.

Form a four-layer structure of the welding tape carrier film, the release film is 1 25 μm, the pre-crosslinked layer is 2 25 μm, the transition layer is 4 30 μm, and the adhesive layer is 3 25 μm.

Example 5

The ribbon carrier film with structure as shown in accompanying drawing 3:

Release film layer: PET material, thickness 25μm.

The preparation method of the ribbon carrier film is the same as in Example 1.

A four-layer structure of the welding tape carrier film is formed, the release film is 1 25 μm, the pre-crosslinked layer is 2 40 μm, the transition layer is 4 30 μm, and the adhesive layer is 3 40 μm.

Comparative example 1

Support layer: pure PET film, thickness 40μm. (without pre-crosslinked layer)

The raw material formula of the bonding layer is: 91.2 parts of EVA resin, 1.5 parts of thermal initiator, 3 parts of crosslinking agent, 0.5 part of coupling agent, 0.5 part of anti-aging additive, 0.3 part of processing aid, 3 parts of anti-PID additive, thickness 40 μm.

In the high-speed mixer, all kinds of raw materials are mixed evenly, and then granulated by the twin-screw extruder, and then cast into a film. The cast film is directly poured on the PET film and then wound up. The temperature of the PET film surface is 25 -100°C.

Comparative example 2 (adhesive layer is not cross-linked)

The ribbon carrier film with structure as shown in accompanying drawing 3:

Release film layer: PET material, thickness 25μm.

The raw material formula of the bonding layer is: 94.2 parts of EVA resin, 1.5 parts of thermal initiator, 0.5 part of coupling agent, 0.5 part of anti-aging additive, 0.3 part of processing aid, and 3 parts of anti-PID additive.

The preparation method of the ribbon carrier film is the same as in Example 1.

The preparation method of the cell assembly is the same as in Example 1.

Comparative example 3 (the degree of precrosslinking of precrosslinked layer 2 is low)

The ribbon carrier film with structure as shown in accompanying drawing 3:

Release film layer: PET material, thickness 25μm.

The raw material formula of the pre-crosslinked layer is: 96.8 parts of EVA resin, 0.2 part of ultraviolet photoinitiator, 0.5 part of crosslinking agent, 0.2 part of coupling agent, 1 part of anti-aging additive, 0.3 part of processing aid, and 1 part of anti-PID additive .

The preparation method of the ribbon carrier film is the same as in Example 1.

The preparation method of the cell assembly is the same as in Example 1.

The carrier membranes prepared in the above examples and comparative examples were tested according to the following method, and the test results are shown in Table 1.

The detection and evaluation methods of each performance are as follows:

Pre-crosslinking degree/crosslinking degree: solvent method (xylene reflux at 145°C, 5h);

Transmittance: GB/T 2410-2008;

Haze: GB/T 2410-2008

Table 1

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present application, and the purpose is to enable those familiar with this technology to understand the content of the present application and implement it accordingly, and not to limit the protection scope of the present application. All equivalent changes or modifications made according to the spirit of the present application shall fall within the protection scope of the present application.

Claims

A carrier film for welding tape, which includes a pre-crosslinked layer and an adhesive layer, the pre-crosslinked layer is the same as the matrix resin of the adhesive layer, and the matrix resin is ethylene-vinyl acetate copolymer, polyolefin elastic One or more of polymers, ethylene acrylic acid copolymers, or ethyl methacrylates,

The pre-crosslinking degree of the pre-crosslinking layer is 30% to 80%, and the pre-crosslinking degree of the adhesive layer is ≤ 1%;

Moreover, after the ribbon carrier film is prepared into a photovoltaic module, the crosslinking degree of the adhesive layer is 50%-90%.
The ribbon carrier film of claim 1, wherein:

The addition amount of the matrix resin in the pre-crosslinked layer is 60% to 98% of the total mass of the raw materials of the pre-crosslinked layer, and the raw materials of the pre-crosslinked layer also include the addition amount of the pre-crosslinked layer. 1% to 8% of the crosslinking agent of the total mass of the raw material formulation of the interlinked layer, and an ultraviolet photoinitiator added in an amount of 0.1% to 5% of the total mass of the raw material formulation of the pre-crosslinked layer;

The addition amount of the matrix resin in the adhesive layer is 50% to 98% of the total mass of the raw materials of the adhesive layer, and the raw materials of the adhesive layer also include the raw materials added in an amount of the adhesive layer The cross-linking agent is 1%-8% of the total mass, and the thermal initiator is added in an amount of 0.1%-5% of the total mass of the raw materials of the bonding layer.
The welding tape carrier film according to claim 2, wherein: the raw material of the adhesive layer also includes an ultraviolet photoinitiator, and the total mass of the raw material of the adhesive layer is 100%, and the addition of the ultraviolet light additive Amount ≤ 0.1%.
The ribbon carrier film according to claim 2, wherein: the raw material of the pre-crosslinked layer further includes an anti-aging agent added in an amount of 0.1% to 3% of the total mass of the raw material formula of the pre-crosslinked layer;

The raw materials of the adhesive layer also include a coupling agent added in an amount of 0.1% to 2% of the total mass of the raw materials of the adhesive layer, and an added amount of 0.1% to 3% of the total mass of the raw materials of the adhesive layer. % anti-aging agent.
The welding tape carrier film according to claim 4, wherein: the raw materials of the pre-crosslinked layer also include a tackifying resin, an additive amount of 0.1% to 20% of the total mass of the raw material formula of the pre-crosslinked layer, A coupling agent whose amount is 0.005% to 2% of the total mass of the raw material formulation of the pre-crosslinked layer, a processing aid added in an amount of 0.001% to 1% of the total mass of the raw material formulation of the pre-crosslinked layer, and an additive An anti-PID additive in an amount of 0.005% to 5% of the total mass of the raw material formulation of the pre-crosslinked layer;

The raw materials of the adhesive layer also include a tackifying resin added in an amount of 0.1% to 30% of the total mass of the raw materials of the adhesive layer, and an added amount of 0.001% to 1% of the total mass of the raw materials of the adhesive layer processing aids, anti-PID additives added in an amount of 0.005% to 5% of the total mass of raw materials of the bonding layer;

The cross-linking agent is triallyl isocyanurate, trimethallyl isocyanate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, or pentaerythritol triacrylate. one or more;

Described ultraviolet photoinitiator is one or more in trimethylolpropane triacrylate, 2-trimethylolpropane tetraacrylate, 4-(dimethylamino) ethyl benzoate;

The thermal initiator is ethoxylated trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, dicumyl peroxide, 2,5- One or more of dimethyl-2,5-bis(tert-butylperoxy)hexane;

The tackifying resin is one or more of rosin, hydrogenated rosin, petroleum resin, hydrogenated petroleum resin, phenolic resin, or terpene resin;

The coupling agent is one or more of a silane coupling agent, a titanate coupling agent, or an aluminate coupling agent;

The anti-aging agent is one or more of antioxidants, light stabilizers, or ultraviolet absorbers;

The processing aid is an antiblocking agent and/or a lubricant.
The solder tape carrier film according to claim 1, wherein the thicknesses of the pre-crosslinked layer and the adhesive layer are independently 20-200 μm.
The welding tape carrier film according to claim 1, wherein: a release film is provided on the outside of the pre-crosslinked layer.
The ribbon carrier film according to any one of claims 1 to 7, wherein the ribbon carrier film further comprises one or more layers disposed between the pre-crosslinked layer and the adhesive layer transition layer, the transition layer is cross-linked or non-cross-linked,

When the transition layer is cross-linked, the pre-cross-linking degree of the transition layer is ≤ 1%, and after the ribbon carrier film is prepared into a photovoltaic module, the cross-linking degree of the transition layer is less than or equal to 90% %.
The welding ribbon carrier film according to claim 8, wherein: the raw materials of the transition layer include matrix resin in an amount of 50% to 98% of the total mass of the raw materials of the transition layer, and the addition amount of the transition layer is The cross-linking agent is 1-8% of the total mass of raw materials, and the thermal initiator is added in an amount of 0.1-5% of the total mass of raw materials of the transition layer.
The welding tape carrier film according to claim 9, wherein: the raw material of the transition layer also includes an ultraviolet photoinitiator, and the addition amount of the ultraviolet light additive is ≤ 0.1%;

The ultraviolet photoinitiator is one or more of trimethylolpropane triacrylate, 2-trimethylolpropane tetraacrylate, and 4-(dimethylamino) ethyl benzoate.
The welding ribbon carrier film according to claim 9, wherein: the raw material of the transition layer further includes a tackifying resin whose addition amount is 0.1% to 30% of the total mass of the transition layer raw material, and the addition amount is the transition layer The coupling agent of 0.1%～2% of the total mass of the raw materials of the layer, the anti-aging agent of 0.1%～3% of the total mass of the raw materials of the transition layer, the addition of 0.1%～3% of the total mass of the raw materials of the transition layer 0.001% to 1% of processing aids, and 0.005% to 5% of anti-PID additives added in an amount of 0.005% to 5% of the total mass of raw materials of the transition layer;

The matrix resin of the transition layer is one or more of ethylene-vinyl acetate copolymer, polyolefin elastomer, ethylene acrylic acid copolymer, or ethyl methacrylate;

The thermal initiator is ethoxylated trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, dicumyl peroxide, 2,5- One or more of dimethyl-2,5-bis(tert-butylperoxy)hexane;

The crosslinking agent is one of triallyl isocyanurate, trimethallyl isocyanate, propane trimethylol triacrylate, trimethylolpropane trimethacrylate, or pentaerythritol triacrylate or more;

The tackifying resin is one or more of rosin, hydrogenated rosin, petroleum resin, hydrogenated petroleum resin, phenolic resin, or terpene resin;

The coupling agent is one or more of a silane coupling agent, a titanate coupling agent, or an aluminate coupling agent;

The anti-aging agent is one or more of antioxidants, light stabilizers, or ultraviolet absorbers;

The processing aid is an antiblocking agent and/or a lubricant.
A method for preparing a ribbon carrier film as claimed in any one of claims 1 to 11, wherein: the raw materials of each layer are mixed and granulated respectively, and then formed into a film through multi-layer co-extrusion casting, and the film is formed by UV or electron The beam irradiates the pre-crosslinked layer, and the electron beam irradiation dose is 10kGy-25kGy.
A solder ribbon composite, comprising: the solder ribbon carrier film according to any one of claims 1 to 11, and a solder ribbon adhered to the solder ribbon carrier film.
A method for preparing a solder ribbon composite as claimed in claim 13, wherein: the temperature is controlled at 80°C to 170°C, and the solder ribbon is adhered to any one of claims 1 to 11 by pressing. On the carrier film described in Item 1, the pressing time is controlled to be 0.1 s to 1 s, and two adjacent carrier films are respectively located on both sides of the welding strip and distributed at intervals.
A battery sheet composite, wherein: comprising a battery sheet, a welding ribbon in contact with the battery sheet, and a carrier film for fixing the welding ribbon on the battery sheet, the carrier film is The ribbon carrier film according to any one of claims 1 to 11.
A method for preparing a ribbon composite as claimed in claim 15, comprising:

cutting the ribbon attached to the carrier film to form a ribbon complex unit, the ribbon composite unit is composed of the ribbon and two carrier films,

The temperature is controlled at 100° C. to 300° C., and the ribbon composite unit is pressed on the surface of the battery sheet, and the pressing time is controlled to be 0.2s to 3s.
An application of the ribbon carrier film as claimed in any one of claims 1 to 11, or the ribbon composite as claimed in claim 13, or the cell sheet composite as claimed in claim 15 in a photovoltaic module.
A method for preparing a photovoltaic module, wherein: the method for preparing a photovoltaic module is specifically:

The back sheet, the lower layer of adhesive film, the battery sheet complex described in claim 15, the upper layer of adhesive film, and the glass are sequentially laminated, placed in a laminator and laminated to obtain a single-glass solar module,

Or the lower layer of glass, the lower layer of adhesive film, the battery chip complex described in claim 15, the upper layer of adhesive film, and the upper layer of glass are sequentially laminated, placed in a laminator and laminated to obtain a double-glass solar module,

The lamination conditions are: lamination temperature 120°C-180°C, vacuum time 3-8min, lamination time 8-20min;

When the carrier film is provided with a release film, the release film is removed before lamination.