阅读说明：本技术 一种光伏组件层压用定位胶带 (Positioning adhesive tape for laminating photovoltaic module ) 是由 季志超 吕松 黄宝玉 张刚 徐炜琴 刘俊 陈书亮 杨求平 吴斌 吴丰华 于 2021-09-03 设计创作，主要内容包括：本发明属于光伏制造领域,公开了一种光伏组件层压用定位胶带,包括与光伏封装胶膜接触具有高粘接性的下层,对电池片具有高粘接力的上层,所述下层包括乙烯共聚物树脂。所述上层为常温下具有一定粘性的胶黏剂,所述上层是通过转印的方法转移至下层。所述下层为热熔型树脂,所述树脂同时添加了一定比例的抗氧剂,光稳定剂。本发明结构简单,下层具有一定的强度,在高温下对电池具有一定的约束性,可有效防止组件层压过程中电池的偏移。同时层压后对封装胶膜及电池均具有较高的粘接性及可靠性,可避免层压后由于封装胶膜与胶带不粘导致的鼓包现象。(The invention belongs to the field of photovoltaic manufacturing, and discloses a positioning adhesive tape for laminating a photovoltaic module. The upper layer is an adhesive with certain viscosity at normal temperature, and the upper layer is transferred to the lower layer by a transfer printing method. The lower layer is hot-melt resin, and the resin is added with an antioxidant and a light stabilizer in a certain proportion. The invention has simple structure, the lower layer has certain strength and certain constraint on the battery at high temperature, and can effectively prevent the battery from deviating in the lamination process of the assembly. Meanwhile, the laminated packaging adhesive film and the battery have high adhesion and reliability, and the phenomenon of bulging caused by the fact that the packaging adhesive film and the adhesive tape are not adhered after lamination can be avoided.)

1. A positioning adhesive tape for laminating a photovoltaic module is characterized by comprising a lower layer which is in contact with a photovoltaic packaging adhesive film and has high adhesiveness and an upper layer which is in contact with a cell slice and has high adhesiveness, wherein the lower layer comprises ethylene copolymer resin.

2. The positioning tape for laminating a photovoltaic module according to claim 1, wherein the thickness of the lower layer is in the range of 5 to 70 μm.

3. The positioning tape for laminating a photovoltaic module according to claim 1, wherein the thickness of the upper layer is in the range of 5 to 30 μm.

4. The positioning tape for laminating a photovoltaic module according to claim 1, wherein the ethylene copolymer resin comprises at least one of an ethylene-vinyl acetate copolymer, an ethylene-alpha olefin copolymer, and an ethylene-methyl methacrylate copolymer.

5. The positioning adhesive tape for laminating the photovoltaic module as claimed in claim 1 or 4, wherein the lower layer further comprises an additive, and the additive comprises the following components in percentage by mass based on the total mass of the raw materials of the lower layer: 0.1-4% of coupling agent, 0.03-0.1% of peroxide, 0.01-5% of light stabilizer and 0.03-0.1% of antioxidant.

6. The positioning tape for laminating a photovoltaic module according to claim 5, wherein the coupling agent is one or more of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltris (b-methoxyethoxy) silane, gamma-methacryloxypropyltrimethoxysilane and vinyltriisopropoxysilane.

7. The positioning adhesive tape for laminating a photovoltaic module as claimed in claim 5, wherein the peroxide is one or more of dicumyl peroxide, di-tert-butylperoxydiisopropylbenzene, tert-butyl peroxy-2-ethyl hexyl carbonate, 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane and tert-butyl peroxy-2-ethylhexyl carbonate.

8. The positioning adhesive tape for laminating a photovoltaic module as claimed in claim 5, wherein the light stabilizer is one or more of 3, 5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester, bis (2,2,6, 6-tetramethylpiperidyl) sebacate, tris (1,2,2,6, 6-pentamethyl-4-piperidyl) phosphite and bis (1-octyloxy-2, 2,6, 6-tetramethyl-4-piperidyl) sebacate; the antioxidant is one or more of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid N-octadecyl ester, N '-bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine, 2, 6-di-tert-butyl-p-cresol, 4' -thiobis (3-methyl-6-tert-butylphenol), dilaurate thiodipropionate and tris (2, 4-di-tert-butylphenyl) phosphite.

9. The positioning adhesive tape for laminating a photovoltaic module according to claim 5, wherein the preparation method of the lower layer comprises: mixing ethylene copolymer resin with 0.1-4% of coupling agent and 0.03-0.1% of peroxide, extruding, mixing and granulating, adding 0.01-5% of light stabilizer and 0.03-0.1% of antioxidant, and uniformly mixing to prepare the film.

10. The positioning adhesive tape for laminating a photovoltaic module according to claim 1, wherein the upper layer is an adhesive layer, and the upper layer is transferred to the lower layer by transfer printing.

Technical Field

The invention relates to a photovoltaic manufacturing technology, in particular to a positioning adhesive tape for laminating a photovoltaic module.

Background

The photovoltaic module is in the encapsulation process, divide into evacuation and lamination two processes. During the vacuum-pumping process, the battery will shift due to the suction force, and during the laminating process, the packaging adhesive film will undergo further shifting behavior accompanied by the flowing of the adhesive film under a certain pressure due to insufficient crosslinking. The finished assembly end of the assembly becomes a poor battery string deviation, and even two strings of batteries are contacted to cause short circuit. The existing market mainly uses a PET as a base material adhesive tape, but the PET surface energy is lower, the adhesive force with a packaging adhesive film is smaller, and the problem of the adhesive film matched with the crosslinking rate is smaller. However, in recent years, the cross-linking rate of the packaging adhesive film required by the client is high, so that the adhesive force between the packaging adhesive film and the PET substrate is poor easily at high temperature, and the packaging adhesive film and the PET substrate are layered after lamination or under high-temperature baking, and serious or even bulge is generated, thereby reducing the service life of the component.

Disclosure of Invention

In order to overcome at least one of the technical problems, the invention provides a positioning adhesive tape for laminating a photovoltaic module.

In order to achieve the above purpose, the invention adopts the technical scheme that: a positioning adhesive tape for laminating a photovoltaic module comprises a lower layer which is in contact with a photovoltaic packaging adhesive film and has high adhesion, and an upper layer which is in contact with a cell slice and has high adhesion force, wherein the lower layer comprises ethylene copolymer resin.

Preferably, the thickness of the lower layer ranges from 5 microns to 70 microns.

Preferably, the thickness range of the upper layer is 5-30 microns.

Preferably, the ethylene copolymer resin includes at least one of an ethylene-vinyl acetate copolymer, an ethylene-alpha olefin copolymer, and an ethylene-methyl methacrylate copolymer.

Preferably, the lower layer further comprises an additive, and the additive comprises the following components in percentage by mass based on the total mass of the raw materials of the lower layer: 0.1-4% of coupling agent, 0.03-0.1% of peroxide, 0.01-5% of light stabilizer and 0.03-0.1% of antioxidant.

Preferably, the coupling agent is one or more of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltris (b-methoxyethoxy) silane, gamma-methacryloxypropyltrimethoxysilane and vinyltriisopropoxysilane.

Preferably, the peroxide is one or more of dicumyl peroxide, di-tert-butylperoxy diisopropylbenzene, tert-butyl peroxy-2-ethylhexyl carbonate, 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane and tert-butyl peroxy-2-ethylhexyl carbonate.

Preferably, the light stabilizer is one or more of 3, 5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester, bis (2,2,6, 6-tetramethylpiperidyl) sebacate, tris (1,2,2,6, 6-pentamethyl-4-piperidyl) phosphite and bis (1-octyloxy-2, 2,6, 6-tetramethyl-4-piperidyl) sebacate; the antioxidant is one or more of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid N-octadecyl ester, N '-bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine, 2, 6-di-tert-butyl-p-cresol, 4' -thiobis (3-methyl-6-tert-butylphenol), dilaurate thiodipropionate and tris (2, 4-di-tert-butylphenyl) phosphite.

Preferably, the preparation method of the lower layer comprises: mixing ethylene copolymer resin with 0.1-4% of coupling agent and 0.03-0.1% of peroxide, extruding, mixing and granulating, adding 0.01-5% of light stabilizer and 0.03-0.1% of antioxidant, and uniformly mixing to prepare the film.

Preferably, the upper layer is an adhesive layer, and the upper layer is transferred to the lower layer by transfer printing.

The invention has the advantages that:

a positioning adhesive tape for laminating a photovoltaic module comprises a lower layer having high adhesiveness in contact with a photovoltaic encapsulation adhesive film, and an upper layer having high adhesiveness to a cell sheet, the lower layer comprising an ethylene copolymer resin. The upper layer is an adhesive with certain viscosity at normal temperature, the upper layer is transferred to the lower layer by a transfer printing method, the manufacturing process is simple, and the upper layer and the lower layer are combined stably and are not easy to layer. The lower layer is hot-melt resin, and the resin is added with an antioxidant and a light stabilizer in a certain proportion. The invention has simple structure, the lower layer has certain strength and certain constraint on the battery at high temperature, can effectively prevent the battery from deviating in the lamination process of the assembly, has higher adhesion and reliability on the packaging adhesive film and the battery after lamination, and can avoid the bulge phenomenon caused by the non-adhesion of the packaging adhesive film and the adhesive tape after lamination. The lower layer has good adhesion with POE and EVA packaging adhesive films, and the upper layer has good adhesion with PERC batteries and HJT batteries, and has universality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

in the figure: 1. a lower layer; 2. and (4) an upper layer.

Detailed Description

The raw materials used in the invention are all commercial products except self-made raw materials.

A positioning adhesive tape for laminating a photovoltaic module comprises a lower layer 1 which is in contact with a photovoltaic packaging adhesive film and has high adhesion, and an upper layer 2 which is in contact with a cell piece and has high adhesion force, wherein the lower layer 1 comprises ethylene copolymer resin. The thickness range of the lower layer 1 is 5-70 microns, and the thickness range of the upper layer 2 is 5-30 microns. The ethylene copolymer resin comprises at least one of ethylene-vinyl acetate copolymer, ethylene-alpha olefin copolymer and ethylene-methyl methacrylate copolymer. The lower layer 1 also comprises an additive, wherein the additive comprises the following components in percentage by mass of the total mass of the raw materials of the lower layer 1: 0.1-4% of coupling agent, 0.03-0.1% of peroxide, 0.01-5% of light stabilizer and 0.03-0.1% of antioxidant.

The coupling agent is one or more of vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tri (b-methoxyethoxy) silane, gamma-methacryloxypropyl trimethoxysilane and vinyl triisopropoxysilane. The silane coupling agent is economical and environment-friendly. Adding the silane coupling agent, and modifying the lower layer into silane grafted and modified hot-melt resin.

The peroxide is one or more of dicumyl peroxide, di-tert-butylperoxy diisopropylbenzene, tert-butyl peroxy-2-ethylhexyl carbonate, 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane and tert-butyl peroxy 2-ethylhexyl carbonate. The peroxide is a component for graft-polymerizing the silane coupling agent to the ethylene copolymer resin. The oxygen radicals generated by the thermal decomposition of the peroxide have the property of abstracting hydrogen of the ethylene copolymer resin, thereby promoting the silane coupling agent to be more stable for grafting the ethylene copolymer resin.

The mass ratio of the coupling agent to the total raw materials of the lower layer is controlled within 0.1-4%, because the mass ratio is less than 0.1%, the proportion of the ethylene copolymer resin grafting coupling agent is small, and the grafting effect cannot be achieved, and the mass ratio is more than 4%, the coupling agent can be partially self-polymerized, meanwhile, part of the coupling agent is remained and cannot be grafted to the ethylene copolymer resin, so that the subsequent micromolecules are remained and migrated, and the bonding is adversely affected. Meanwhile, the mass ratio of the peroxide to the total raw materials at the lower layer is controlled to be 0.03-0.1%, so that the effect of the grafting reaction is ensured.

The light stabilizer is one or more of 3, 5-di-tert-butyl-4-hydroxy-benzoic acid hexadecyl ester, bis (2,2,6, 6-tetramethyl piperidyl) sebacate, tris (1,2,2,6, 6-pentamethyl-4-piperidyl) phosphite ester and bis (1-octyloxy-2, 2,6, 6-tetramethyl-4-piperidyl) sebacate; the antioxidant is one or more of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid N-octadecyl ester, N '-bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexanediamine, 2, 6-di-tert-butyl-p-cresol, 4' -thiobis (3-methyl-6-tert-butylphenol), dilaurate thiodipropionate and tris (2, 4-di-tert-butylphenyl) phosphite. The combined action of the light stabilizer and the antioxidant can inhibit the yellowing of the positioning adhesive tape.

A positioning adhesive tape for laminating a photovoltaic module is prepared by the following steps:

1. the preparation method of the lower layer 1:

s1, granulating: mixing ethylene copolymer resin with 0.1-4% of coupling agent and 0.03-0.1% of peroxide, and then extruding, mixing and granulating, wherein the contents of the components are the mass fractions of the total raw materials, and the balance is the ethylene copolymer resin; extrusion compounding granulation can be accomplished by passing through a twin screw extruder. The particle melt flow rate is 1-16 g/10min, and the melting point is 80-110 ℃.

S2, adding 0.01-5% of light stabilizer and 0.05-5% of antioxidant into the particles, and uniformly mixing to prepare the film. The film forming method may be film forming by a single screw extruder, or film forming by blow molding to obtain the lower layer 1.

2. Combining the upper layer with the lower layer:

the upper layer 2 is an adhesive layer which has certain viscosity at normal temperature and is transferred to the lower layer 1 through transfer printing.

Example 1:

the present embodiment includes a lower layer 1 and an upper layer 2. The whole thickness of the positioning adhesive tape is 50 microns, the thickness of the upper layer 2 is 20 microns, the structure of the upper layer 2 is a net structure, and the thickness of the lower layer 1 is 30 microns. The lower layer 1 includes an EVA resin (ethylene-vinyl acetate copolymer resin).

The manufacturing method of the lower layer comprises the following steps: firstly, uniformly mixing EVA resin with 9 percent of VA content and 98 ℃ of melting point, 0.03 percent of tert-butyl peroxy-2-ethyl hexanoate and 2 percent of gamma-methacryloxypropyl trimethoxy silane coupling agent, and then extruding and granulating by a double screw at the temperature of 130 ℃ to obtain particles with the melt flow rate of 7g/10 min. Then 0.02% of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and 0.2% of hexadecyl 3, 5-di-tert-butyl-4-hydroxy-benzoate are added, and the mixture is uniformly mixed and cast into a film.

Compounding an upper layer and a lower layer: the adhesive of the upper layer 2 is made into a 20-micron reticular film, and then the film is transferred to the lower layer 1.

Example 2:

the present embodiment includes a lower layer 1 and an upper layer 2. The whole thickness of the positioning adhesive tape is 80 microns, the thickness of the upper layer 2 is 10 microns, the structure of the upper layer 2 is a net structure, and the thickness of the lower layer 1 is 70 microns. The lower layer includes a PO resin.

The preparation method of the lower layer comprises the following steps: PO resin (ethylene-alpha olefin copolymer resin) having a melting point of 89 ℃ was uniformly mixed with 0.1% of 2, 5-dimethyl-2, 5-bis (t-butylperoxy) hexane and 4% of vinyltriethoxysilane, and then pelletized by twin-screw extrusion at a temperature of 170 ℃ to obtain particles having a melt flow rate of 7g/10 min. Then 0.015 percent of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid n-octadecyl ester and 0.3 percent of bis (2,2,6, 6-tetramethyl piperidyl) sebacate are added and evenly mixed to form a film by tape casting.

Compounding an upper layer and a lower layer: the adhesive of the upper layer 2 is made into a 10-micron reticular film, and then the film is transferred to the lower layer 1.

Example 3:

the present embodiment includes a lower layer 1 and an upper layer 2. The overall thickness of the positioning adhesive tape is 10 microns, the thickness of the upper layer 2 is 5 microns, and the thickness of the lower layer 1 is 5 microns. The lower layer 1 includes EVA resin.

The preparation method of the lower layer comprises the following steps: firstly, EVA resin with 15 percent of VA content and 89 ℃ of melting point is uniformly mixed with 0.05 percent of tert-butyl peroxy-2-ethylhexanoate, 2 percent of vinyl tri (b-methoxyethoxy) silane and 2 percent of gamma-methacryloxypropyl trimethoxy silane, and then the mixture is extruded and granulated by a double screw at 140 ℃ to obtain particles with 15/10min of melt flow rate. Then, 0.03% of N, N' -bis- (3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine and 0.1% of tris (1,2,2,6, 6-pentamethyl-4-piperidyl) phosphite are added, and the mixture is uniformly mixed and cast into a film.

The adhesive of the upper layer 2 is made into a film of 5 micrometers, and then the film is transferred to the lower layer 1.

Comparative example:

the present embodiment includes a lower layer 1 and an upper layer 2. The overall thickness of the positioning tape was 10 microns and the thickness of the upper layer 2 was 5 microns. The lower layer 1 is EVA resin, the melt flow rate is 15g/10min, the VA content is 15%, and the melting point is 89 ℃. In the lower layer 1, 0.2% of vinyltris (b-methoxyethoxy) silane, 0.03% of N, N' -bis- (3- (3, 5-di-t-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine and 0.1% of tris (1,2,2,6, 6-pentamethyl-4-piperidinyl) phosphite were added.

The adhesive of the upper layer 2 is made into a film of 5 micrometers, and then the film is transferred to the lower layer 1.

The positioning tapes of examples 1 to 3 and comparative examples were tested for adhesion to POE, EVA encapsulant, PERC cell, and HJT cell, and the encapsulant was observed for delamination of the lower layer 1 and the upper layer 2 after 24h immersion in ethanol solution. Specific test data are shown in table 1.

Test data sheet

Experimental project	Example 1	Example 2	Example 3	Comparative example	Test standards or methods
						The adhesive force with POE is N/cm	145	160	130	96	ASTMD903-98
The adhesive force with EVA is N/cm	185	179	168	160	ASTMD903-98
						The bonding force with the PERC battery is N/cm	87	67	72	37	ASTMD903-98
The bonding force with the HJT battery is N/cm	113	92	110	25	ASTMD903-98
						Soaking in ethanol for 24 hr	Not layering	Not layering	Not layering	Layering	\

As can be seen from Table 1, the adhesion force between the lower layer 1 and the POE adhesive film is greater than 130N/cm, the adhesion force between the lower layer 1 and the EVA adhesive film is greater than 160N/cm, the adhesion force between the upper layer 2 and the PERC battery is greater than 60N/cm, and the adhesion force between the upper layer 2 and the HJT battery is greater than 90N/cm. In addition, the packaging adhesive film bonded with the positioning adhesive tape is not layered after being put into the ethanol solution for 24 hours, and long-term use is ensured in practical application.

The foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention, which is defined in the claims of the present application, and any other technical entity or method implemented by another person is encompassed by the claims, if it is identical to or equivalent to the definition of the claims of the present application.