Photovoltaic module gap synergistic positioning adhesive tape and preparation method thereof

Abstract

The invention discloses a photovoltaic module gap synergistic positioning adhesive tape and a preparation method thereof. The photovoltaic module gap synergistic positioning adhesive tape comprises a base material layer, a functional layer and a bonding layer which are sequentially compounded from top to bottom. The gap synergistic positioning adhesive tape for the photovoltaic module is mainly applied between battery pieces and strings of the photovoltaic module, has a positioning function, and can improve the power generation power of the photovoltaic module through the light reflection performance; under the lamination temperature of 120-150 DEG C, a sufficient buffering effect is provided through the functional layer, so that the subfissure and fragment of the battery are prevented; the bonding layer is made of a polyethylene glycol oligomer containing t-butyloxycarboryl, and when the photovoltaic module needs to be repaired, the bonding layer can be heated by an infrared lamp to quickly lose viscosity, so that the photovoltaic module is easy to repair, more cell pieces are prevented from being broken when the positioning adhesive tape is torn off, and the service life of the photovoltaic module is prolonged. Meanwhile, by adopting the t-butyloxycarboryl polyethylene glycol oligomer, the raw materials can be promoted to be uniformly dispersed, and the viscosity and the reflectivity of the gap synergistic positioning adhesive tape for the photovoltaic module can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic modules, and in particular relates to a photovoltaic module gap enhancement positioning tape and a preparation method thereof. Background Art

[0002] Photovoltaic modules are made of photovoltaic glass, packaging materials, batteries, backplane (or glass) and other layers, which are put into the photovoltaic laminator and laminated under the lamination conditions of 120-150℃. During the lamination process of the modules, positioning tape is required to fix the battery string to prevent problems such as paralleling of battery cells and displacement between strings.

[0003] The structure of the most common positioning tape is composed of transparent PET and acrylic glue coated on its surface. Positioning tape is generally transparent and is only pasted at a few fixed positions between the battery cell strings. As the modules become larger and larger, the positioning effect of the positioning tape is also getting worse, especially when the POE encapsulation film is encapsulated, a large displacement will occur, resulting in unstable position between the strings, and there is a risk of short circuit caused by parallel cells. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a photovoltaic module gap enhancement positioning tape and a preparation method thereof. In addition to having a positioning function, the photovoltaic module gap enhancement positioning tape can also improve the power generation power of the photovoltaic module through its reflective performance.

[0005] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:

[0006] A photovoltaic module gap enhancement positioning tape comprises a substrate layer, a functional layer and an adhesive layer which are compounded in sequence from top to bottom, wherein the adhesive layer is a thermoplastic elastomer pressure-sensitive adhesive layer containing an activatable material.

[0007] Furthermore, the raw materials for preparing the bonding layer include, by weight, 30-80 parts of thermoplastic elastomer copolymer, 5-25 parts of reflective filler, 0.1-3 parts of activatable material, 10-25 parts of tackifying resin, 5-15 parts of plasticizer and 0.1-5 parts of auxiliary agent.

[0008] Furthermore, the activatable material is one or a combination of tert-butoxycarbonyl-hexapolyethylene glycol-bromide, tert-butoxycarbonyl-octapolyethylene glycol-bromide, tert-butoxycarbonyl-nonapolyethylene glycol-bromide, and tert-butoxycarbonyl-pentadecaprolactone.

[0009] Furthermore, the thermoplastic elastomer copolymer is at least one of styrene-butadiene ternary block copolymer, styrene-isoprene-styrene ternary block copolymer, and epoxidized styrene-isoprene-styrene ternary block copolymer; the tackifying resin is one or a combination of rosin, rosin resin, terpene resin, C5 petroleum resin, coumarone resin, aromatic petroleum resin, PS resin, terpene phenolic resin, and aromatic petroleum resin; the plasticizer is one or a combination of cyclohexane oil, polyisobutylene, liquid paraffin, and phthalate; and the auxiliary agent is one or a combination of ultraviolet absorbers, antioxidants, and cross-linking agents.

[0010] Furthermore, the raw materials for preparing the substrate layer include 67-95 parts of polymer resin A, 5-35 parts of reflective filler and 0.1-3 parts of additives in parts by weight.

[0011] Furthermore, the polymer resin A is one or a combination of polypropylene, polyethylene terephthalate, polyimide, polycarbonate, polyphenylene ether, polyamide, and polyethylene.

[0012] Furthermore, the raw materials for preparing the functional layer include 72-95 parts of polymer resin B, 5-25 parts of reflective filler and 0.1-3 parts of additives in parts by weight.

[0013] Furthermore, the polymer resin B is an ethylene copolymer with a melting point of 70-120° C., and the ethylene copolymer is one or a combination of ethylene-butene copolymer, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, and ethylene-methacrylate copolymer.

[0014] Furthermore, the reflective filler is one or a combination of titanium dioxide, talcum powder, calcium carbonate, barium sulfate, and zinc oxide; and the additive is one or a combination of antioxidants, light stabilizers, and ultraviolet absorbers.

[0015] The present invention also discloses a method for preparing a photovoltaic module gap enhancement positioning tape, comprising the following steps:

[0016] 1) By weight, 67-95 parts of polymer resin A, 5-35 parts of reflective filler and 0.1-3 parts of additives are put into a twin-screw extruder and mixed evenly, and extruded into granules at 100-200° C., and then dried at 50-80° C. for 2-5 hours to obtain a masterbatch of the substrate layer;

[0017] 2) According to weight, 72-95 parts of polymer resin B, 5-25 parts of reflective filler and 0.1-3 parts of additives are put into a twin-screw extruder and mixed evenly, and extruded into granules at 100-200° C., and then dried at 50-80° C. for 2-5 hours to obtain functional layer masterbatch;

[0018] 3) putting the base material layer masterbatch and the functional layer masterbatch into a multi-layer casting extruder, casting at 100-200° C. to obtain a film with a thickness of 50-200 μm, wherein the film comprises a base material layer and a functional layer compounded in sequence from top to bottom, the base material layer has a thickness of 40-150 μm, and the functional layer has a thickness of 10-50 μm;

[0019] 4) 30-80 parts by weight of thermoplastic elastomer copolymer are put into a hot melt adhesive coating machine, heated to 100-250° C. to melt, then 5-25 parts of reflective filler, 0.1-3 parts of activatable material, 10-25 parts of tackifying resin, 5-15 parts of plasticizer and 0.1-5 parts of auxiliary agent are added and mixed evenly, and then coated on the functional layer obtained in step 3) to form a bonding layer with a thickness of 10-50 μm;

[0020] There is no order of precedence for steps 1) and 2).

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The invention discloses a photovoltaic module gap enhancement positioning tape and a preparation method thereof. The photovoltaic module gap enhancement positioning tape comprises a substrate layer, a functional layer and an adhesive layer which are compounded in sequence from top to bottom. The functional layer is made of an ethylene copolymer with a melting point of 70-120°C. Under a lamination temperature of 120-150°C, the functional layer can provide sufficient buffering effect to prevent hidden cracks and fragments of batteries. The adhesive layer is made of an activatable material, which is a polyethylene glycol oligomer containing tert-butyloxycarbonyl. When the photovoltaic module needs to be repaired, the adhesive layer can be quickly heated by an infrared lamp to lose its viscosity, thereby facilitating repair and avoiding more battery cells from being broken when the positioning tape is torn off. At the same time, the use of the polyethylene glycol oligomer containing tert-butyloxycarbonyl can promote uniform dispersion of raw materials, which is beneficial to improving the viscosity and reflectivity of the photovoltaic module gap enhancement positioning tape. The photovoltaic module gap enhancement positioning tape is mainly used between battery cells and strings of photovoltaic modules. In addition to having a positioning effect, it can also improve the power generation power of the photovoltaic module through its reflective performance. DETAILED DESCRIPTION

[0023] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0024] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0025] The invention discloses a photovoltaic component gap enhancement positioning tape, which comprises a substrate layer, a functional layer and an adhesive layer which are compounded in sequence from top to bottom.

[0026] The raw materials for preparing the substrate layer include 67-95 parts of polymer resin A, 5-35 parts of reflective filler and 0.1-3 parts of additives.

[0027] The polymer resin A is one or a combination of polypropylene, polyethylene terephthalate, polyimide, polycarbonate, polyphenylene ether, polyamide and polyethylene.

[0028] The raw materials for preparing the functional layer include 72-95 parts of polymer resin B, 5-25 parts of reflective filler and 0.1-3 parts of additives.

[0029] The polymer resin B is an ethylene copolymer with a melting point of 70-120° C., and the ethylene copolymer is one or a combination of ethylene-butene copolymer, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, and ethylene-methacrylate copolymer.

[0030] The raw materials for preparing the bonding layer include 30-80 parts of thermoplastic elastomer copolymer, 5-25 parts of reflective filler, 0.1-3 parts of activatable material, 10-25 parts of tackifying resin, 5-15 parts of plasticizer and 0.1-5 parts of auxiliary agent.

[0031] The thermoplastic elastomer copolymer is at least one of styrene-butadiene terblock copolymer, styrene-isoprene-styrene terblock copolymer and epoxidized styrene-isoprene-styrene terblock copolymer; the auxiliary agent is one or a combination of antioxidants, crosslinking agents and ultraviolet absorbers.

[0032] The activatable material is a polyethylene glycol oligomer containing a tert-butoxycarbonyl group, and the polyethylene glycol oligomer containing a tert-butoxycarbonyl group is one or a combination of tert-butoxycarbonyl-hexapolyethylene glycol-bromide, tert-butoxycarbonyl-octapolyethylene glycol-bromide, tert-butoxycarbonyl-nonapolyethylene glycol-bromide, and tert-butoxycarbonyl-pentadecaprolactone.

[0033] The reflective filler is one or a combination of titanium dioxide, talcum powder, calcium carbonate, barium sulfate and zinc oxide.

[0034] The additive is one or a combination of antioxidants, light stabilizers and ultraviolet absorbers.

[0035] The tackifying resin is one or a combination of rosin, rosin resin, terpene resin, C5 petroleum resin, coumarone resin, aromatic petroleum resin, PS resin, terpene phenolic resin, and aromatic petroleum resin.

[0036] The plasticizer is one or a combination of naphthenic oil, polyisobutylene, liquid paraffin and phthalate.

[0037] The auxiliary agent is one or a combination of ultraviolet absorber, antioxidant and crosslinking agent.

[0038] The ultraviolet absorber is at least one of UV320, UV234, UV944, UV328, UV1130, UV770, and UV BP-4.

[0039] The antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 1098, antioxidant AO-80, antioxidant 412S, antioxidant 245, antioxidant 168, zinc N,N-dibutylsulfonated aminobenzoate, and zinc ethylphenyldithiocarbamate.

[0040] The present invention also discloses a method for preparing a photovoltaic module gap enhancement positioning tape, comprising the following steps:

[0041] 1) By weight, 67-95 parts of polymer resin A, 5-35 parts of reflective filler and 0.1-3 parts of additives are put into a twin-screw extruder and mixed evenly, and extruded into granules at 100-200° C., and then dried at 50-80° C. for 2-5 hours to obtain a masterbatch of the substrate layer;

[0042] 2) According to weight, 72-95 parts of polymer resin B, 5-25 parts of reflective filler and 0.1-3 parts of additives are put into a twin-screw extruder and mixed evenly, and extruded into granules at 100-200° C., and then dried at 50-80° C. for 2-5 hours to obtain functional layer masterbatch;

[0043] 3) putting the base material layer masterbatch and the functional layer masterbatch into a multi-layer casting extruder, casting at 100-200° C. to obtain a film with a thickness of 50-200 μm, wherein the film comprises a base material layer and a functional layer compounded in sequence from top to bottom, the base material layer has a thickness of 40-150 μm, and the functional layer has a thickness of 10-50 μm;

[0044] 4) By weight, 30-80 parts of thermoplastic elastomer copolymer are put into a hot melt adhesive coating machine, heated to 100-250°C to melt, then 5-25 parts of reflective filler, 0.1-3 parts of activatable material, 10-25 parts of tackifying resin, 5-15 parts of plasticizer and 0.1-5 parts of auxiliary agent are added and mixed evenly, and then coated on the functional layer obtained in step 3) to form a bonding layer with a thickness of 10-50 μm.

[0045] There is no order of precedence for steps 1) and 2).

[0046] The present invention also discloses a method for preparing a photovoltaic module, comprising the following steps:

[0047] Lay the front glass → lay the adhesive film → lay the battery → paste the photovoltaic module gap enhancement positioning tape → lay the adhesive film → lay the back plate or back plate glass → test EL → return for repair if there is any defect, otherwise enter the laminator for lamination;

[0048] In case of repair, you can use an infrared lamp to heat the position that needs repair to 180-200℃. The activatable material in the adhesive layer will be activated, and the photovoltaic module gap enhancement positioning tape at that position will lose its adhesion. Tear off the photovoltaic module gap enhancement positioning tape, and after the repair is completed, re-adhere the photovoltaic module gap enhancement positioning tape.

[0049] Example 1

[0050] Based on 100 parts by weight, the raw materials for preparing the substrate layer include:

[0051] 69.4 parts of polymer resin A polypropylene, 25 parts of reflective filler titanium dioxide, 5 parts of reflective filler talc, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020.

[0052] Based on 100 parts by total weight, the raw materials for preparing the functional layer include:

[0053] 74.4 parts of ethylene-octene copolymer with a melting point of 82°C, 25 parts of reflective filler titanium dioxide, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020.

[0054] Based on 100 parts by weight, the raw materials for preparing the bonding layer include:

[0055] 27.7 parts of styrene-butadiene ternary block copolymer, 16 parts of styrene-isoprene-styrene ternary block copolymer, 1 part of activatable material tert-butyloxycarbonyl-octaethylene glycol-brominated, 25 parts of reflective filler titanium dioxide, 20 parts of terpene phenolic resin, 10 parts of plasticizer polyisobutylene, 0.1 parts of antioxidant ethylphenyl dithiocarbamate zinc, and 0.2 parts of ultraviolet absorber UV320.

[0056] A method for preparing a photovoltaic module gap enhancement positioning tape comprises the following steps:

[0057] 1) By weight, 69.4 parts of polymer resin A polypropylene, 25 parts of reflective filler titanium dioxide, 5 parts of reflective filler talc, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020 were put into a twin-screw extruder and mixed evenly, and extruded into granules at 200° C., and then dried at 80° C. for 5 hours to obtain a substrate layer masterbatch;

[0058] 2) By weight, 74.4 parts of ethylene-octene copolymer with a melting point of 82° C., 25 parts of reflective filler titanium dioxide, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020 were put into a twin-screw extruder and mixed evenly, and extruded into granules at 120° C., and then dried at 50° C. for 5 hours to obtain a functional layer masterbatch;

[0059] 3) putting the base material layer masterbatch and the functional layer masterbatch into a multi-layer casting extruder, casting at 200° C. to obtain a film with a thickness of 120 μm, wherein the film comprises a base material layer and a functional layer compounded in sequence from top to bottom, the base material layer has a thickness of 90 μm, and the functional layer has a thickness of 30 μm;

[0060] 4) By weight, 27.7 parts of styrene-butadiene ternary block copolymer and 16 parts of styrene-isoprene-styrene ternary block copolymer are put into a hot melt adhesive coating machine, heated to 250° C. to melt, then 1 part of activatable material tert-butyloxycarbonyl-octaethylene glycol-brominated, 25 parts of reflective filler titanium dioxide, 20 parts of terpene phenolic resin, 10 parts of plasticizer polyisobutylene, 0.1 part of antioxidant ethylphenyl dithiocarbamate zinc, and 0.2 part of ultraviolet absorber UV320 are added and mixed evenly, and then coated on the functional layer obtained in step 3) to form a bonding layer with a thickness of 20 μm;

[0061] There is no order of precedence for steps 1) and 2).

[0062] Example 2

[0063] Based on 100 parts by weight, the raw materials for preparing the substrate layer include:

[0064] 69.4 parts of polymer resin A polypropylene, 25 parts of reflective filler titanium dioxide, 5 parts of reflective filler talc, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020.

[0065] Based on 100 parts by total weight, the raw materials for preparing the functional layer include:

[0066] 74.4 parts of ethylene-vinyl acetate copolymer with a melting point of 76°C, 25 parts of reflective filler titanium dioxide, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020.

[0067] Based on 100 parts by weight, the raw materials for preparing the bonding layer include:

[0068] 26.7 parts of styrene-butadiene ternary block copolymer, 16 parts of styrene-isoprene-styrene ternary block copolymer, 2 parts of activatable material tert-butyloxycarbonyl-pentadecapolyethylene glycol-brominated, 25 parts of reflective filler titanium dioxide, 20 parts of terpene phenolic resin, 10 parts of plasticizer polyisobutylene, 0.1 parts of antioxidant ethylphenyl dithiocarbamate zinc, and 0.2 parts of ultraviolet absorber UV320.

[0069] A method for preparing a photovoltaic module gap enhancement positioning tape comprises the following steps:

[0070] 1) By weight, 69.4 parts of polymer resin A polypropylene, 25 parts of reflective filler titanium dioxide, 5 parts of reflective filler talc, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020 were put into a twin-screw extruder and mixed evenly, and extruded into granules at 200° C., and then dried at 80° C. for 5 hours to obtain a substrate layer masterbatch;

[0071] 2) By weight, 74.4 parts of ethylene-vinyl acetate copolymer with a melting point of 76° C., 25 parts of reflective filler titanium dioxide, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020 were put into a twin-screw extruder and mixed evenly, and extruded into granules at 120° C., and then dried at 50° C. for 5 hours to obtain a functional layer masterbatch;

[0072] 3) putting the base material layer masterbatch and the functional layer masterbatch into a multi-layer casting extruder, casting at 150° C. to obtain a film with a thickness of 80 μm, wherein the film comprises a base material layer and a functional layer compounded in sequence from top to bottom, the base material layer has a thickness of 50 μm, and the functional layer has a thickness of 30 μm;

[0073] 4) By weight, 26.7 parts of styrene-butadiene ternary block copolymer and 16 parts of styrene-isoprene-styrene ternary block copolymer are put into a hot melt adhesive coating machine and heated to 180°C for melting. Subsequently, 2 parts of activatable material tert-butyloxycarbonyl-pentadecapolyethylene glycol-bromide, 25 parts of reflective filler titanium dioxide, 20 parts of terpene phenolic resin, 10 parts of plasticizer polyisobutylene, 0.1 parts of antioxidant ethylphenyl dithiocarbamate zinc, and 0.2 parts of ultraviolet absorber UV320 are added and mixed evenly, and then coated on the functional layer obtained in step 3) to form a bonding layer with a thickness of 20 μm.

[0074] There is no order of precedence for steps 1) and 2).

[0075] Example 3

[0076] Based on 100 parts by weight, the raw materials for preparing the substrate layer include:

[0077] 69.4 parts of polymer resin A polypropylene, 25 parts of reflective filler titanium dioxide, 5 parts of reflective filler talc, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020.

[0078] Based on 100 parts by total weight, the raw materials for preparing the functional layer include:

[0079] 74.4 parts of polymer resin B (ethylene-methacrylate copolymer with a melting point of 110°C), 25 parts of reflective filler titanium dioxide, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020.

[0080] Based on 100 parts by weight, the raw materials for preparing the bonding layer include:

[0081] 26.7 parts of styrene-butadiene ternary block copolymer, 16 parts of epoxidized styrene-isoprene-styrene ternary block copolymer, 2 parts of activatable material tert-butyloxycarbonyl-octaethylene glycol-brominated, 25 parts of reflective filler titanium dioxide, 20 parts of terpene phenolic resin, 10 parts of plasticizer polyisobutylene, 0.1 parts of antioxidant ethylphenyl dithiocarbamate zinc, and 0.2 parts of ultraviolet absorber UV320.

[0082] A method for preparing a photovoltaic module gap enhancement positioning tape comprises the following steps:

[0083] 1) By weight, 69.4 parts of polymer resin A polypropylene, 25 parts of reflective filler titanium dioxide, 5 parts of reflective filler talc, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020 were put into a twin-screw extruder and mixed evenly, and extruded into granules at 200° C., and then dried at 80° C. for 5 hours to obtain a substrate layer masterbatch;

[0084] 2) By weight, 74.4 parts of ethylene-methacrylate copolymer with a melting point of 110° C. of polymer resin B, 25 parts of reflective filler titanium dioxide, 0.1 parts of antioxidant 1010, and 0.5 parts of light stabilizer 2020 were put into a twin-screw extruder and mixed evenly, extruded into granules at 120° C., and then dried at 50° C. for 5 hours to obtain a functional layer masterbatch;

[0085] 3) putting the base material layer masterbatch and the functional layer masterbatch into a multi-layer casting extruder, casting at 150° C. to obtain a film with a thickness of 80 μm, wherein the film comprises a base material layer and a functional layer compounded in sequence from top to bottom, the base material layer has a thickness of 50 μm, and the functional layer has a thickness of 30 μm;

[0086] 4) By weight, 26.7 parts of styrene-butadiene ternary block copolymer and 16 parts of epoxidized styrene-isoprene-styrene ternary block copolymer are put into a hot melt adhesive coating machine and heated to 250°C for melting. Subsequently, 2 parts of activatable material tert-butyloxycarbonyl-octaethylene glycol-bromide, 25 parts of reflective filler titanium dioxide, 20 parts of terpene phenolic resin, 10 parts of plasticizer polyisobutylene, 0.1 parts of antioxidant ethylphenyl dithiocarbamate zinc, and 0.2 parts of ultraviolet absorber UV320 are added and mixed evenly, and then coated on the functional layer obtained in step 3) to form a bonding layer with a thickness of 20 μm.

[0087] There is no order of precedence for steps 1) and 2).

[0088] Comparative Example 1

[0089] The difference between this comparative example and Example 1 is that the raw material for preparing the adhesive layer of this comparative example does not use an activatable material.

[0090] The rest is the same as in Example 1.

[0091] Comparative Example 2

[0092] The difference between this comparative example and Example 1 is that the functional layer of this comparative example uses ethylene-vinyl acetate copolymer with a melting point of 65° C. instead of ethylene-octene copolymer with a melting point of 82° C. in Example 1.

[0093] The rest is the same as in Example 1.

[0094] Comparative Example 3

[0095] The difference between this comparative example and Example 1 is that the functional layer of this comparative example uses polyethylene with a melting point of 125° C. instead of the ethylene-octene copolymer with a melting point of 82° C. in Example 1.

[0096] The rest is the same as in Example 1.

[0097] Comparative Example 4

[0098] Commercially available positioning tape.

[0099] The following tests were performed on Examples 1-3 and Comparative Examples 1-4:

[0100] Reflectivity is tested according to IEC62788-2-1, with a test band of 400-1100nm;

[0101] The method for testing the adhesion to the battery is to cut the sample into 1cm wide strips, paste them on the battery, and use a tensile machine to test the peel strength with the battery. The adhesion to the battery after lamination is to put the glass / encapsulation film / battery / positioning film / release paper into the laminator in the order from bottom to top for lamination. The lamination temperature is 120℃ for the first chamber and 140℃ for the second chamber. The lamination time is 18min. After lamination, the peel strength with the battery is tested with a tensile machine.

[0102] The adhesion after activation is to stick a 1 cm strip to the battery, and then use an infrared lamp to irradiate for 10" at 180°C, and then test the peel strength with the battery. After irradiation with the infrared lamp, the activation material in the embodiment is activated, so that the positioning film can be easily torn off during repair, and the battery will not be damaged when the positioning film is torn off;

[0103] The samples of Examples 1-3 and Comparative Examples 1-4 were cut into 0.5 cm strips and pasted between module sheets and strings. With other materials unchanged, modules were prepared and the module power was tested.

[0104] The test results are shown in Table 1.

[0105] Table 1

[0106]

[0107] From the data in Table 1, we can see that:

[0108] The reflectivity of Examples 1-3 is above 92%, while the reflectivity of Comparative Example 1 without adding activatable materials is only 86.51%, indicating that adding activatable materials can improve the reflectivity. Comparative Example 4 is a commercially available positioning tape, which is a light-transmitting material and has basically no reflective effect;

[0109] The adhesion to the battery before lamination, when comparing Examples 1-3 with Comparative Example 1, is significantly higher than that of Comparative Example 1 without adding the activation material, indicating that adding the activatable material can improve the adhesion performance of the adhesive layer;

[0110] Photovoltaic cells are usually very thin and fragile, and the positioning tape needs to be torn off to remove the cells during repair. In Example 1, an activatable material is added. Under the heating of an infrared lamp, the activating material is activated and releases gas, causing the adhesive force of the adhesive layer to drop instantly. In this way, the positioning tape can be easily torn off the cell during repair without damaging the cell. After irradiation of the infrared lamp at 180°C for 10″, the adhesive force of Examples 1-3 dropped to 0.5N / cm or less, and they were easily torn off. Comparative Examples 1 and 4 without adding activating materials had no activation effect;

[0111] The power comparison is positively correlated with the reflectivity. The module power of Examples 1-3 is higher than that of Comparative Examples 1 and 4. The module appearance of Comparative Example 2 has jagged edges and flanges, which is due to the low melting point of the functional layer, resulting in poor appearance caused by the flow of the functional layer during lamination. Comparative Example 3 has hidden cracks in the battery, which is due to the high melting point of the functional layer, which does not play a buffering role during lamination, thus damaging the battery.

[0112] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0113] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A photovoltaic module gap enhancement positioning tape, characterized in that: The invention comprises a substrate layer, a functional layer and a bonding layer which are compounded in sequence from top to bottom. The bonding layer is a thermoplastic elastomer pressure-sensitive adhesive layer containing an activatable material.

2. The photovoltaic module gap enhancement positioning tape according to claim 1, characterized in that: By weight, the raw materials for preparing the bonding layer include 30-80 parts of thermoplastic elastomer copolymer, 5-25 parts of reflective filler, 0.1-3 parts of activatable material, 10-25 parts of tackifying resin, 5-15 parts of plasticizer and 0.1-5 parts of auxiliary agent.

3. A photovoltaic module gap enhancement positioning tape according to claim 1 or 2, characterized in that: The activatable material is one or a combination of tert-butyloxycarbonyl-hexapolyethylene glycol-bromide, tert-butyloxycarbonyl-octapolyethylene glycol-bromide, tert-butyloxycarbonyl-nonapolyethylene glycol-bromide, and tert-butyloxycarbonyl-pentadecaprolactone.

4. The photovoltaic module gap enhancement positioning tape according to claim 2, characterized in that: The thermoplastic elastomer copolymer is at least one of styrene-butadiene ternary block copolymer, styrene-isoprene-styrene ternary block copolymer, and epoxidized styrene-isoprene-styrene ternary block copolymer; the tackifying resin is one or a combination of rosin, rosin resin, terpene resin, C5 petroleum resin, coumarone resin, aromatic petroleum resin, PS resin, terpene phenolic resin, and aromatic petroleum resin; the plasticizer is one or a combination of cyclohexane oil, polyisobutylene, liquid paraffin, and phthalate; and the auxiliary agent is one or a combination of ultraviolet absorbers, antioxidants, and crosslinking agents.

5. The photovoltaic module gap enhancement positioning tape according to claim 1, characterized in that: In parts by weight, the raw materials for preparing the substrate layer include 67-95 parts of polymer resin A, 5-35 parts of reflective filler and 0.1-3 parts of additives.

6. The photovoltaic module gap enhancement positioning tape according to claim 5, characterized in that: The polymer resin A is one or a combination of polypropylene, polyethylene terephthalate, polyimide, polycarbonate, polyphenylene ether, polyamide, and polyethylene.

7. The photovoltaic module gap enhancement positioning tape according to claim 1, characterized in that: In terms of weight, the raw materials for preparing the functional layer include 72-95 parts of polymer resin B, 5-25 parts of reflective filler and 0.1-3 parts of additives.

8. The photovoltaic module gap enhancement positioning tape according to claim 7, characterized in that: The polymer resin B is an ethylene copolymer with a melting point of 70-120° C., and the ethylene copolymer is one or a combination of ethylene-butene copolymer, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, and ethylene-methacrylate copolymer.

9. A photovoltaic module gap enhancement positioning tape according to claim 2, 5 or 7, characterized in that: The reflective filler is one or a combination of titanium dioxide, talcum powder, calcium carbonate, barium sulfate, and zinc oxide; the additive is one or a combination of antioxidants, light stabilizers, and ultraviolet absorbers.

10. A method for preparing a photovoltaic module gap enhancement positioning tape according to any one of claims 1 to 9, characterized in that: The following steps are involved: 1) By weight, 67-95 parts of polymer resin A, 5-35 parts of reflective filler and 0.1-3 parts of additives are put into a twin-screw extruder and mixed evenly, and extruded into granules at 100-200° C., and then dried at 50-80° C. for 2-5 hours to obtain a masterbatch of the substrate layer; 2) According to weight, 72-95 parts of polymer resin B, 5-25 parts of reflective filler and 0.1-3 parts of additives are put into a twin-screw extruder and mixed evenly, and extruded into granules at 100-200° C., and then dried at 50-80° C. for 2-5 hours to obtain functional layer masterbatch; 3) putting the base material layer masterbatch and the functional layer masterbatch into a multi-layer casting extruder, casting at 100-200° C. to obtain a film with a thickness of 50-200 μm, wherein the film comprises a base material layer and a functional layer compounded in sequence from top to bottom, the base material layer has a thickness of 40-150 μm, and the functional layer has a thickness of 10-50 μm; 4) 30-80 parts by weight of thermoplastic elastomer copolymer are put into a hot melt adhesive coating machine, heated to 100-250° C. to melt, then 5-25 parts of reflective filler, 0.1-3 parts of activatable material, 10-25 parts of tackifying resin, 5-15 parts of plasticizer and 0.1-5 parts of auxiliary agent are added and mixed evenly, and then coated on the functional layer obtained in step 3) to form a bonding layer with a thickness of 10-50 μm; There is no order of precedence for steps 1) and 2).

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