CN115926669A - Light EVA (ethylene-vinyl acetate) adhesive film for packaging solar cell - Google Patents
Light EVA (ethylene-vinyl acetate) adhesive film for packaging solar cell Download PDFInfo
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- CN115926669A CN115926669A CN202310134314.XA CN202310134314A CN115926669A CN 115926669 A CN115926669 A CN 115926669A CN 202310134314 A CN202310134314 A CN 202310134314A CN 115926669 A CN115926669 A CN 115926669A
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- adhesive film
- eva
- solar cell
- light
- antioxidant
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- 239000005038 ethylene vinyl acetate Substances 0.000 title claims abstract description 138
- 239000002313 adhesive film Substances 0.000 title claims abstract description 106
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 43
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 title abstract description 138
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 title abstract description 137
- 229920005989 resin Polymers 0.000 claims abstract description 59
- 239000011347 resin Substances 0.000 claims abstract description 59
- 239000004743 Polypropylene Substances 0.000 claims description 52
- 238000002156 mixing Methods 0.000 claims description 48
- 239000002994 raw material Substances 0.000 claims description 48
- 239000004611 light stabiliser Substances 0.000 claims description 28
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 claims description 23
- 239000003963 antioxidant agent Substances 0.000 claims description 22
- 230000003078 antioxidant effect Effects 0.000 claims description 22
- 238000005187 foaming Methods 0.000 claims description 21
- 238000002360 preparation method Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 18
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 17
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 16
- 239000003431 cross linking reagent Substances 0.000 claims description 16
- 239000012530 fluid Substances 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 238000010894 electron beam technology Methods 0.000 claims description 9
- 239000003292 glue Substances 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 9
- FIYMNUNPPYABMU-UHFFFAOYSA-N 2-benzyl-5-chloro-1h-indole Chemical compound C=1C2=CC(Cl)=CC=C2NC=1CC1=CC=CC=C1 FIYMNUNPPYABMU-UHFFFAOYSA-N 0.000 claims description 8
- 238000005538 encapsulation Methods 0.000 claims description 8
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 7
- 230000001678 irradiating effect Effects 0.000 claims description 7
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 6
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 5
- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 claims description 4
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 4
- 239000004641 Diallyl-phthalate Substances 0.000 claims description 3
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 claims description 3
- OKKRPWIIYQTPQF-UHFFFAOYSA-N Trimethylolpropane trimethacrylate Chemical compound CC(=C)C(=O)OCC(CC)(COC(=O)C(C)=C)COC(=O)C(C)=C OKKRPWIIYQTPQF-UHFFFAOYSA-N 0.000 claims description 3
- QUDWYFHPNIMBFC-UHFFFAOYSA-N bis(prop-2-enyl) benzene-1,2-dicarboxylate Chemical compound C=CCOC(=O)C1=CC=CC=C1C(=O)OCC=C QUDWYFHPNIMBFC-UHFFFAOYSA-N 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 150000007970 thio esters Chemical class 0.000 claims description 2
- 229940124543 ultraviolet light absorber Drugs 0.000 claims 1
- 238000003475 lamination Methods 0.000 abstract description 9
- 238000003466 welding Methods 0.000 abstract description 7
- 238000013012 foaming technology Methods 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract description 2
- 230000001070 adhesive effect Effects 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 229920001155 polypropylene Polymers 0.000 description 47
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 40
- 229910002092 carbon dioxide Inorganic materials 0.000 description 20
- 239000001569 carbon dioxide Substances 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 13
- 239000004698 Polyethylene Substances 0.000 description 11
- 238000001125 extrusion Methods 0.000 description 11
- 229920000573 polyethylene Polymers 0.000 description 11
- 238000001723 curing Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 238000005266 casting Methods 0.000 description 8
- 238000007493 shaping process Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910000679 solder Inorganic materials 0.000 description 5
- -1 polypropylene Polymers 0.000 description 4
- 239000012528 membrane Substances 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 150000008301 phosphite esters Chemical class 0.000 description 3
- 239000005341 toughened glass Substances 0.000 description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- JKBYAWVSVVSRIX-UHFFFAOYSA-N octadecyl 2-(1-octadecoxy-1-oxopropan-2-yl)sulfanylpropanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)SC(C)C(=O)OCCCCCCCCCCCCCCCCCC JKBYAWVSVVSRIX-UHFFFAOYSA-N 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 235000010354 butylated hydroxytoluene Nutrition 0.000 description 1
- 238000001227 electron beam curing Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 150000003254 radicals Chemical group 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Laminated Bodies (AREA)
Abstract
The invention belongs to the technical field of adhesives, and particularly relates to a light EVA (ethylene vinyl acetate) adhesive film for packaging a solar cell. When the low gram weight EVA adhesive film is practically applied in the photovoltaic industry, the thickness of the EVA adhesive film is reduced, and the welding strip can protrude to burst the adhesive film during lamination, so that the solar cell is easy to crack and lose efficacy. Aiming at the problems, the invention provides a light EVA adhesive film for packaging a solar cell, which is prepared by modifying EVA resin and adopting a foaming technology, so that the light EVA adhesive film with reliable quality is obtained, the lamination thickness of the EVA adhesive film is increased under the condition of not increasing the weight of the EVA adhesive film, and the condition that a welding strip breaks the adhesive film to cause the failure of the solar cell or the reduction of the whole service life can be effectively prevented.
Description
Technical Field
The invention belongs to the technical field of adhesives, and particularly relates to a light EVA (ethylene vinyl acetate) adhesive film for packaging a solar cell.
Background
The outermost two layers of the rigid solar cell are generally made of toughened glass, the middle layer of the rigid solar cell is made of an EVA (ethylene vinyl acetate) material and a cell piece, solar energy can be absorbed and converted into electric energy, the service life of the rigid solar cell is 25 years, but the conventional rigid solar cell is heavy in weight, a support is required during installation, the rigid solar cell is not easy to install and move, and therefore the light weight of the rigid solar cell is a future development trend.
An ethylene-vinyl acetate copolymer (EVA) adhesive film is a polymer adhesive film which is relatively widely applied at present and is an important component of a photovoltaic cell module. The core function of the glue film is as follows: (1) The buffer protection function is realized on the battery piece, and the stress hidden crack of the battery piece in the lamination process or the use process of the assembly is prevented; (2) insulating and blocking effects; and (3) bonding. Under the requirement of weight reduction of the rigid solar cell, development of an EVA adhesive film with low gram weight is one of important means for weight reduction of the rigid solar cell.
In the production of the solar cell module, a welding strip is arranged between every two solar cells, and the solar cell module adopts an EVA adhesive film with low gram weight and can meet the following problems:
the EVA adhesive film has a buffering effect in the laminating and production line circulation processes of the solar cell module. Theoretically, the thickness of the EVA adhesive film needs to be larger than the total thickness of the cell and the solder strip. If the grammes per square metre of EVA glued membrane reduces, lamination pressure is unchangeable, and EVA glued membrane thickness can reduce thereupon, and the welding strip is very likely to burst EVA glued membrane and toughened glass contact during the lamination, and under huge pressure, the cracked risk increase of battery. In addition, after the thickness of the EVA adhesive film is reduced, the solder strip is easily exposed, the glass and the solder strip are easily layered, poor appearance is generated, and meanwhile, under the action of cold and hot circulation, the stress between the solar cell and the solder strip is not effectively buffered to generate hidden crack, so that the output power of the solar cell module is greatly reduced. Therefore, the difficulty in developing the low gram weight EVA film is to have a low gram weight, and to prevent the solder strip from being exposed and breaking the EVA film to contact with the toughened glass.
The foaming technology is a common means for reducing the weight of high polymer materials, and EVA foaming products are mature and widely applied in the fields of light weight, sound insulation, buffering and shock absorption; however, the problem that the foaming EVA is limited to be further developed at present is that the melting range of the EVA is low, the maximum outdoor temperature of the solar cell panel in summer can reach about 70 ℃ (DEG C), and the melting temperature of most foaming EVA products is about 70 ℃, and even lower.
Disclosure of Invention
The problems in the prior art are that: when the low gram weight EVA adhesive film is practically applied in the photovoltaic industry, the thickness of the EVA adhesive film is reduced, and the welding strip can protrude to burst the adhesive film during lamination, so that the solar cell is easy to crack and lose efficacy. Aiming at the problems, the invention provides a light EVA adhesive film for packaging a solar cell, which is obtained by modifying EVA resin and adopting a foaming technology and has reliable quality, and the specific technical scheme is as follows:
a light EVA adhesive film for solar cell packaging comprises the following raw materials in parts by weight:
100 parts of EVA/PP resin;
0.5-2 parts of a silane coupling agent;
0.5-3 parts of a crosslinking agent;
0.5-2 parts of a light stabilizer;
0.1-0.5 part of antioxidant.
Preferably, the preparation method of the EVA/PP resin comprises the following steps:
(1) Uniformly mixing EVA resin, polypropylene (PP) and an antioxidant 1010, adding the mixture into an internal mixer, mixing for 5 minutes (min) at the temperature of 175-185 ℃, adding triallyl isocyanurate, continuously mixing for 5min, discharging to obtain a mixture, and standing for 24 hours (h);
(2) Placing the mixture after standing on a vulcanizing press at 175-185 ℃, preheating for 5min, maintaining the pressure for 5min, and keeping the pressure at 2MPa (MPa), then cold-pressing to room temperature, and demoulding to obtain a sheet of 10 millimeters (mm) x 10mm x 1mm, sealing the sheet with a Polyethylene (PE) film, and irradiating with an electron beam accelerator to obtain a target product;
the weight ratio of the EVA resin to the PP to the antioxidant 1010 to the triallyl isocyanurate is (75-85) g (g): (15-25) g:0.2g:2g of the total weight.
Preferably, the EVA resin has a Vinyl Acetate (VA) content of 28%.
Preferably, the electron beam accelerator irradiates 50-150 kilograys (kGy) with an irradiation time of 10-30 seconds(s).
Preferably, the silane coupling agent includes at least one of 3- (methacryloyloxy) propyltrimethoxysilane, vinyltrimethoxysilane, and vinyltris (2-methoxyethoxy) silane.
Preferably, the crosslinking agent comprises one or more of tert-butyl peroxy-2-ethylhexyl carbonate, dicumyl peroxide, triallyl isocyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate or diallyl phthalate.
Preferably, the light stabilizer comprises at least one of a light stabilizer UV292, a light stabilizer UV770, or an ultraviolet absorber UVB-2.
Preferably, the antioxidant comprises one or more of a phenol antioxidant, a thioester antioxidant and a phosphite antioxidant.
The preparation method of the light EVA adhesive film for packaging the solar cell comprises the following steps:
s1: sequentially adding EVA/PP resin, a silane coupling agent, a crosslinking agent, a light stabilizer and an antioxidant raw material into a mixer according to the formula amount, and mixing and stirring for 2-3h at the temperature of 80 ℃ and the rotating speed of 50-100 revolutions per minute (rpm) to obtain a mixed raw material;
s2: placing the mixed raw material obtained from S1 in a double-screw extruder, melting, blending and extruding at 90-110 deg.C and 45-50rpm, and continuously injecting carbon dioxide (CO) into the second section of the extruder barrel 2 ) Until the materials in the extruder are discharged and cast through a cast film die head, and a primary foaming glue film is obtained by molding, CO 2 The gas injection flow rate of the supercritical fluid is 0.01 (milliliters per minute) mL/min; the diameter of a screw of the extruder is 35 millimeters (mm), and the length-diameter ratio is 40/1;
s3: and (3) drawing the primary foaming adhesive film obtained in the step (S2) to a drawing roller for longitudinal drawing, cooling the primary foaming adhesive film to be shaped and solidified by a cooling roller, and cutting and rolling to obtain the light EVA adhesive films with different thicknesses for packaging the solar cells.
The invention has the beneficial effects that:
(1) According to the invention, PP modified EVA resin is adopted, so that on one hand, the melting temperature of the modified EVA resin can be increased, and the obtained EVA adhesive film has good high and low temperature cycle resistance;
(2) The invention passes CO 2 The EVA adhesive film obtained by the supercritical foaming technology can improve the lamination thickness of the EVA adhesive film under the condition of not increasing the weight of the EVA adhesive film, and effectively solves the problems that a welding strip can be protruded to burst the adhesive film during lamination to cause the failure of a solar cell or the reduction of the whole service life;
(3) According to the invention, the EVA/PP with the EVA and PP cross-linked resin structure is obtained by adopting an electron beam curing technology, the method is clean and efficient, the obtained EVA adhesive film has no free radical residue, the curing is faster and more thorough, and the stability of the obtained EVA adhesive film is better;
(4) The light weight of the foamed product can prolong the service life of the foamed product on a solar cell, and the invention uses CO 2 The EVA adhesive film prepared by the method has uniform pores, is pollution-free, can be realized at a lower temperature, has better supporting and reinforcing effects, and uniform microcells, so that other auxiliary components in the formula of the EVA adhesive film can be more uniformly dispersed, the fisheye phenomenon of the EVA adhesive film in the laminating process can be reduced, the mechanical properties such as the tensile strength of the obtained EVA adhesive film can be improved, and the service stability and the service life of a solar cell module can be further improved.
Detailed Description
The present invention will be described in detail with reference to examples. It is to be understood, however, that the following examples are illustrative of embodiments of the present invention and are not to be construed as limiting the scope of the invention.
The EVA resin used in the following examples and comparative examples of the present invention was manufactured by Korea corporation under the designation E282PV;
the PP resin used in the following examples of the invention is the brand 1300 produced by Yanshan petrochemical company;
the phosphite used in the following examples and comparative examples of the present invention was antioxidant 1010.
The PE film for sealing during irradiation of the EVA/PP resin sheet is purchased from Xinrunu protective film Co., ltd, no. XR201803011010.
The twin-screw extruders used in the following examples and comparative examples of the present invention had a screw diameter of 35mm and a length-to-diameter ratio of 40/1.
Example 1
A light EVA adhesive film for packaging a solar cell comprises the following raw materials in parts by weight:
100 parts of EVA/PP resin;
1.2 parts of 3- (methacryloyloxy) propyltrimethoxysilane;
1.5 parts of tert-butyl peroxy-2-ethylhexyl carbonate;
1 part of triallyl isocyanurate;
light stabilizer UV292 parts;
phosphite 0.3 part.
The preparation method of the light EVA adhesive film for packaging the solar cell comprises the following steps:
s1: according to the formula amount, sequentially adding EVA/PP resin, silane coupling agent, cross-linking agent, light stabilizer and antioxidant raw materials into a mixer, and mixing and stirring at the temperature of 80 ℃ and the rotating speed of 100rpm for 2 hours to obtain a mixed raw material;
s2: placing the mixed raw material obtained in the step S1 into a double-screw extruder, carrying out melt blending and extrusion at the rotating speed of 50rpm, wherein the zone temperatures of all sections of the double-screw extruder are respectively 90 ℃, 100 ℃ and 110 ℃, and in the extrusion process, continuously injecting supercritical fluid CO into the second section of a charging barrel of the extruder 2 Until the material in the extruder is discharged and cast through a cast film die head, and a primary foaming glue film is obtained by molding, wherein CO is 2 Supercritical fluidThe gas injection flow of the body is 0.01mL/min; the diameter of a screw of the extruder is 35mm, and the length-diameter ratio is 40/1;
s3: and (3) drawing the primary foamed adhesive film obtained in the step (S2) to a drawing roller for longitudinal drawing, cutting and rolling after the primary foamed adhesive film is shaped and solidified by a cooling roller, and obtaining the light EVA adhesive film for packaging the solar cell with the thickness of 600 micrometers (mum).
The preparation method of the EVA/PP resin comprises the following steps:
uniformly mixing EVA resin, PP and antioxidant 1010, and adding the mixture into an internal mixer, wherein the weight ratio of the EVA resin to the PP to the antioxidant 1010 to triallyl isocyanurate is 80g:20g:0.2g:2g, mixing for 5min at 180 ℃, adding triallyl isocyanurate, continuing mixing for 5min, and discharging; standing for 24h, placing the blend on a flat vulcanizing machine at 180 ℃, preheating for 5min, maintaining the pressure for 5min, keeping the pressure at 2MPa, then cold-pressing to room temperature, demoulding to obtain a sheet with the thickness of 10mm multiplied by 1mm, sealing the sheet by a Polyethylene (PE) film, and then placing the sheet in an electron beam accelerator for irradiation with the irradiation dose of 75kGy and the irradiation time of 22s to obtain a target product with the gel content of 31.4%.
Example 2
A light EVA adhesive film for solar cell packaging is composed of the following raw materials in parts by weight:
100 parts of EVA/PP resin;
0.5 part of vinyl tri (2-methoxyethoxy) silane;
1.5 parts of tert-butyl peroxy-2-ethylhexyl carbonate;
1.5 parts of diallyl phthalate;
0.5 part of light stabilizer UV 770;
0.1 part of phosphite ester.
A light EVA adhesive film for packaging a solar cell is prepared by the following steps:
s1: according to the formula amount, sequentially adding EVA/PP resin, silane coupling agent, cross-linking agent, light stabilizer and antioxidant raw materials into a mixer, and mixing and stirring at the temperature of 80 ℃ and the rotating speed of 50rpm for 3 hours to obtain a mixed raw material;
s2: putting the mixed raw material obtained in the step S1 into a double-screw extruder, and carrying out melt blending at the rotating speed of 45rpm,Extruding, wherein the zone temperature of each section of the double-screw extruder is respectively 90 ℃, 100 ℃, 110 ℃ and 110 ℃, and in the extruding process, supercritical fluid CO is continuously injected into the second section of the charging barrel of the extruder 2 Until the material in the extruder is discharged and cast through a cast film die head, and a primary foaming glue film is obtained by molding, wherein CO is 2 The gas injection flow rate of the supercritical fluid is 0.01mL/min; the diameter of a screw of the extruder is 35mm, and the length-diameter ratio is 40/1;
s3: and (3) drawing the primary foamed adhesive film obtained in the step (S2) onto a drawing roller for longitudinal drawing, shaping and curing by a cooling roller, and cutting and rolling to obtain the light EVA adhesive film with the thickness of 600 mu m for packaging the solar cell.
The preparation method of the EVA/PP resin comprises the following steps:
uniformly mixing EVA resin, PP and antioxidant 1010, and adding the mixture into an internal mixer, wherein the weight ratio of EVA, PP, antioxidant 1010 and triallyl isocyanurate is 75g:25g of: 0.2g:2g, mixing for 5min at 185 ℃, adding triallyl isocyanurate, continuously mixing for 5min, and discharging; standing for 24h, placing the blend on a vulcanizing press at 185 ℃, preheating for 5min, maintaining the pressure for 5min, and then cold pressing to room temperature and demoulding to obtain a sheet with the thickness of 10mm × 10mm × 1mm, sealing the sheet with a PE film, and irradiating with an electron beam accelerator for 20s at an irradiation dose of 90kGy to obtain a target product with the gel content of 30.8%.
Example 3
A light EVA adhesive film for solar cell packaging is composed of the following raw materials in parts by weight:
100 parts of EVA/PP resin;
2 parts of vinyl trimethoxy silane;
1 part of dicumyl peroxide;
1 part of trimethylolpropane trimethacrylate;
2 parts of ultraviolet absorber UVB-2;
0.4 part of 2, 6-di-tert-butyl-p-cresol;
phosphite 0.1 part.
The preparation method of the light EVA adhesive film for packaging the solar cell comprises the following steps:
s1: according to the formula amount, sequentially adding EVA/PP resin, silane coupling agent, cross-linking agent, light stabilizer and antioxidant raw materials into a mixer, and mixing and stirring for 3 hours at the temperature of 80 ℃ and the rotating speed of 60rpm to obtain a mixed raw material;
s2: placing the mixed raw material obtained in the step S1 into a double-screw extruder, carrying out melt blending and extrusion at the rotating speed of 50rpm, wherein the zone temperatures of all sections of the double-screw extruder are respectively 90 ℃, 100 ℃ and 100 ℃, and in the extrusion process, supercritical fluid CO is continuously injected into the second section of a charging barrel of the extruder 2 Until the materials in the extruder are discharged and cast through a cast film die head, and a primary foaming glue film is obtained by molding, CO 2 The gas injection flow rate of the supercritical fluid is 0.01mL/min; the diameter of a screw of the extruder is 35mm, and the length-diameter ratio is 40/1;
s3: and (3) drawing the primary foamed adhesive film obtained in the step (S2) onto a drawing roller for longitudinal drawing, shaping and curing by a cooling roller, and cutting and rolling to obtain the light EVA adhesive film with the thickness of 600 mu m for packaging the solar cell.
The preparation method of the EVA/PP resin comprises the following steps:
uniformly mixing EVA resin, PP and antioxidant 1010, and adding the mixture into an internal mixer, wherein the weight ratio of the EVA resin to the PP to the antioxidant 1010 to the triallyl isocyanurate is 85g:15g:0.2g:2g, mixing for 5min at 175 ℃, adding triallyl isocyanurate, continuing mixing for 5min, and discharging; standing for 24h, placing the blend on a vulcanizing press at 175 ℃, preheating for 5min, maintaining the pressure for 5min, and then cold pressing to room temperature and demoulding to obtain a sheet with the thickness of 10mm × 10mm × 1mm, sealing the sheet with a PE film, and irradiating with an electron beam accelerator for 30s at an irradiation dose of 50kGy to obtain a target product with the gel content of 33.7%.
Example 4
A light EVA adhesive film for packaging a solar cell comprises the following raw materials in parts by weight:
100 parts of EVA/PP resin;
1 part of vinyl trimethoxy silane;
0.5 part of dicumyl peroxide;
0.7 part of light stabilizer UV 770;
phosphite 0.2 part.
The preparation method of the light EVA adhesive film for packaging the solar cell comprises the following steps:
s1: sequentially adding EVA/PP resin, a silane coupling agent, a crosslinking agent, a light stabilizer and an antioxidant raw material into a mixer according to the formula amount, and mixing and stirring for 2 hours at the temperature of 80 ℃ and the rotating speed of 90rpm to obtain a mixed raw material;
s2: placing the mixed raw material obtained in the step S1 into a double-screw extruder, carrying out melt blending and extrusion at the rotating speed of 45rpm, wherein the zone temperatures of all sections of the double-screw extruder are respectively 90 ℃, 100 ℃, 110 ℃ and 110 ℃, and in the extrusion process, continuously injecting supercritical fluid CO into the second section of a charging barrel of the extruder 2 Until the material in the extruder is discharged and cast through a cast film die head, and a primary foaming glue film is obtained by molding, wherein CO is 2 The gas injection flow rate of the supercritical fluid is 0.01mL/min; the diameter of a screw of the extruder is 35mm, and the length-diameter ratio is 40/1;
s3: and (3) drawing the primary foamed adhesive film obtained in the step (S2) onto a drawing roller for longitudinal drawing, shaping and curing by a cooling roller, and cutting and rolling to obtain the light EVA adhesive film with the thickness of 600 mu m for packaging the solar cell.
The preparation method of the EVA/PP resin comprises the following steps:
uniformly mixing EVA resin, PP and antioxidant 1010, and adding the mixture into an internal mixer, wherein the weight ratio of EVA, PP, antioxidant 1010 and triallyl isocyanurate is 78g:22g:0.2g:2g, mixing for 5min at 180 ℃, adding triallyl isocyanurate, continuing mixing for 5min, and discharging; and standing for 24 hours, placing the blend on a flat vulcanizing machine at 180 ℃, preheating for 5 minutes, maintaining the pressure for 5 minutes, keeping the pressure at 2MPa, then cold-pressing to room temperature, demolding to obtain a sheet with the thickness of 10mm, 10mm and 1mm, sealing the sheet by using a PE (polyethylene) film, and irradiating by using an electron beam accelerator with the irradiation dose of 150kGy for 10s to obtain a target product with the gel content of 38.5%.
Example 5
A light EVA adhesive film for solar cell packaging is composed of the following raw materials in parts by weight:
100 parts of EVA/PP resin;
1.5 parts of vinyl tri (2-methoxyethoxy) silane;
0.5 part of dicumyl peroxide;
1.5 parts of ultraviolet absorber UVB-2;
0.4 part of dioctadecyl thiodipropionate.
The preparation method of the light EVA adhesive film for packaging the solar cell comprises the following steps:
s1: sequentially adding EVA/PP resin, a silane coupling agent, a crosslinking agent, a light stabilizer and an antioxidant raw material into a mixer according to the formula amount, and mixing and stirring for 2.5 hours at the temperature of 80 ℃ and the rotating speed of 70rpm to obtain a mixed raw material;
s2: placing the mixed raw material obtained in S1 in a double-screw extruder, melting, blending and extruding at the temperature of 90 ℃, 100 ℃, 105 ℃ and the rotating speed of 50rpm in each section, and continuously injecting supercritical fluid CO into the second section of a charging barrel of the extruder 2 Until the material in the extruder is discharged and cast through a cast film die head, and a primary foaming glue film is obtained by molding, wherein CO is 2 The gas injection flow rate of the supercritical fluid is 0.01mL/min; the diameter of a screw of the extruder is 35mm, and the length-diameter ratio is 40/1;
s3: drawing the primary foaming adhesive film obtained in the step (S2) onto a drawing roller for longitudinal drawing, cooling the primary foaming adhesive film by a cooling roller for shaping and curing, and cutting and rolling to obtain a light EVA adhesive film with the thickness of 600 mu m for packaging the solar cell;
the preparation method of the EVA/PP resin comprises the following steps:
uniformly mixing EVA resin, PP and antioxidant 1010, and adding the mixture into an internal mixer, wherein the weight ratio of EVA, PP, antioxidant 1010 and triallyl isocyanurate is 82g:18g:0.2g:2g, mixing for 5min at 178 ℃, adding triallyl isocyanurate, continuously mixing for 5min, and discharging; standing for 24h, placing the blend on a flat vulcanizing machine at 178 ℃, preheating for 5min, maintaining the pressure for 5min, and then cold pressing to room temperature and demoulding to obtain a sheet with the thickness of 10mm multiplied by 1mm, sealing the sheet with a PE film, and irradiating with an electron beam accelerator for 15s with the irradiation dose of 130kGy to obtain a target product with the gel content of 37.8%.
Example 6
A light EVA adhesive film for packaging a solar cell comprises the following raw materials in parts by weight:
100 parts of EVA/PP resin;
1.2 parts of vinyl trimethoxy silane;
1 part of dicumyl peroxide;
0.5 part of trimethylolpropane triacrylate;
light stabilizer UV292 parts;
0.4 part of dioctadecyl thiodipropionate.
The preparation method of the light EVA adhesive film for packaging the solar cell comprises the following steps:
s1: sequentially adding EVA/PP resin, a silane coupling agent, a crosslinking agent, a light stabilizer and an antioxidant raw material into a mixer according to the formula amount, and mixing and stirring for 2.5 hours at the temperature of 80 ℃ and the rotating speed of 80rpm to obtain a mixed raw material;
s2: placing the mixed raw material obtained in the step S1 into a double-screw extruder, carrying out melt blending and extrusion at the rotating speed of 50rpm, wherein the zone temperatures of all sections of the double-screw extruder are respectively 90 ℃, 100 ℃ and 110 ℃, and in the extrusion process, continuously injecting supercritical fluid CO into the second section of a charging barrel of the extruder 2 Until the material in the extruder is discharged and cast through a cast film die head, and a primary foaming glue film is obtained by molding, wherein CO is 2 The gas injection flow rate of the supercritical fluid is 0.01mL/min; the diameter of a screw of the extruder is 35mm, and the length-diameter ratio is 40/1;
s3: and (3) drawing the primary foamed adhesive film obtained in the step (S2) onto a drawing roller for longitudinal drawing, shaping and curing by a cooling roller, and cutting and rolling to obtain the light EVA adhesive film with the thickness of 600 mu m for packaging the solar cell.
The preparation method of the EVA/PP resin comprises the following steps:
uniformly mixing EVA resin, PP and antioxidant 1010, and adding the mixture into an internal mixer, wherein the weight ratio of the EVA resin to the PP to the antioxidant 1010 to the triallyl isocyanurate is 80g:20g:0.2g:2g, mixing for 5min at 182 ℃, adding triallyl isocyanurate, continuing mixing for 5min, and discharging; standing for 24h, placing the blend on a flat vulcanizing machine at 182 ℃, preheating for 5min, maintaining the pressure for 5min, and then cold pressing to room temperature and demoulding to obtain a sheet with the thickness of 10mm multiplied by 1mm, sealing the sheet with a PE film, and irradiating with an electron beam accelerator for 20s with the irradiation dose of 100kGy to obtain a target product with the gel content of 35.6%.
Comparative example 1
An EVA adhesive film for packaging a solar cell comprises the following raw materials in parts by weight:
100 parts of EVA resin;
1.2 parts of 3- (methacryloyloxy) propyltrimethoxysilane;
1.5 parts of tert-butyl peroxy-2-ethylhexyl carbonate;
1 part of triallyl isocyanurate;
light stabilizer UV292 parts;
phosphite 0.3 part.
The preparation method of the EVA adhesive film for packaging the solar cell comprises the following steps:
s1: according to the formula amount, sequentially adding EVA resin, silane coupling agent, cross-linking agent, light stabilizer and antioxidant raw materials into a mixer, and mixing and stirring at the temperature of 80 ℃ and the rotating speed of 100rpm for 2 hours to obtain a mixed raw material;
s2: placing the mixed raw material obtained in the step S1 into a double-screw extruder, carrying out melt blending and extrusion at the rotating speed of 50rpm, wherein the partition temperature of each section of the double-screw extruder is respectively 90 ℃, 100 ℃ and 110 ℃, and carrying out discharge casting through a casting film die head to obtain a primary adhesive film through molding;
s3: and (3) drawing the primary adhesive film obtained in the step (S2) onto a drawing roller for longitudinal drawing, cooling the primary adhesive film by a cooling roller for shaping and curing, and slitting and rolling the primary adhesive film to obtain the EVA adhesive film for packaging the solar cell with the thickness of 600 mu m.
Comparative example 2 the same as example 1 except that comparative example 2 replaces the EVA/PP resin of example 1 with the same parts by weight of the EVA resin and PP resin composition, the weight ratio of EVA resin to PP resin being 4.
Comparative example 3
An embossed EVA adhesive film for packaging a solar cell comprises the following raw materials in parts by weight:
100 parts of EVA resin;
1.2 parts of 3- (methacryloyloxy) propyltrimethoxysilane;
1.5 parts of tert-butyl peroxy-2-ethylhexyl carbonate;
1 part of triallyl isocyanurate;
light stabilizer UV292 parts;
phosphite 0.3 part.
The preparation method of the embossed EVA adhesive film for packaging the solar cell comprises the following steps:
s1: adding raw materials of EVA resin, silane coupling agent, cross-linking agent, light stabilizer and antioxidant into a mixer according to the weight ratio according to the formula amount, and mixing and stirring for 2 hours at the temperature of 80 ℃ and the rotating speed of 100rpm to obtain a mixed raw material;
s2: placing the mixed raw material obtained in the step S1 into a double-screw extruder, carrying out melt blending and extrusion at the rotating speed of 50rpm, wherein the partition temperature of each section of the double-screw extruder is respectively 90 ℃, 100 ℃ and 110 ℃, and carrying out discharge casting through a casting film die head to obtain a primary adhesive film through molding;
s3: and (3) drawing the primary adhesive film obtained in the step (2) onto a drawing roller for longitudinal drawing, carrying out hot pressing, embossing when the film temperature reaches 70 ℃, then carrying out setting and curing on a cooling roller, slitting and rolling to obtain the embossed EVA adhesive film for packaging the solar cell with the thickness of 600 mu m.
Comparative example 4 the same as example 1, except that comparative example 4 did not inject CO into the extruder barrel 2 A supercritical fluid.
Comparative example 5
A light EVA adhesive film for packaging a solar cell comprises the following raw materials in parts by weight:
100 parts of EVA/PP resin;
1.2 parts of 3- (methacryloyloxy) propyltrimethoxysilane;
1.5 parts of tert-butyl peroxy-2-ethylhexyl carbonate;
1 part of triallyl isocyanurate;
light stabilizer UV292 parts;
0.3 part of phosphite ester;
6.5 parts of AC foaming agent.
The preparation method of the light EVA adhesive film for packaging the solar cell comprises the following steps:
s1: according to the formula amount, sequentially adding raw materials of EVA/PP resin, silane coupling agent, cross-linking agent, light stabilizer, antioxidant and foaming agent into a mixer, and mixing and stirring for 2 hours at the temperature of 80 ℃ and the rotating speed of 100rpm to obtain a mixed raw material;
s2: placing the mixed raw material obtained in the step S1 into a double-screw extruder, carrying out melt blending and extrusion at the rotating speed of 50rpm, wherein the partition temperature of each section of the double-screw extruder is 160 ℃, 175 ℃, 190 ℃ and 200 ℃, and carrying out discharge casting through a casting film die head to obtain a primary foaming adhesive film through molding;
s3: and (3) drawing the primary foamed adhesive film obtained in the step (S2) onto a drawing roller for longitudinal drawing, shaping and curing by a cooling roller, and cutting and rolling to obtain the light EVA adhesive film with the thickness of 600 mu m for packaging the solar cell.
The preparation method of the EVA/PP resin is the same as that of the specific example 1.
Comparative example 6
A foaming EVA adhesive film for packaging a solar cell is composed of the following raw materials in parts by weight:
100 parts of EVA resin;
1.2 parts of 3- (methacryloyloxy) propyltrimethoxysilane;
1.5 parts of tert-butyl peroxy-2-ethylhexyl carbonate;
1 part of triallyl isocyanurate;
light stabilizer UV292 parts;
0.3 part of phosphite ester.
The preparation method of the foaming EVA adhesive film for packaging the solar cell comprises the following steps:
s1: according to the formula amount, sequentially adding EVA resin, silane coupling agent, cross-linking agent, light stabilizer and antioxidant raw materials into a mixer, and mixing and stirring at the temperature of 80 ℃ and the rotating speed of 100rpm for 2 hours to obtain a mixed raw material;
s2: placing the mixed raw material obtained in the step S1 into a double-screw extruder, melting, blending and extruding at the rotating speed of 50rpm, wherein the zone temperature of each section of the double-screw extruder is 70 ℃, 80 ℃ and 90 ℃, and supercritical fluid CO is continuously injected into the second section of a charging barrel of the extruder 2 Discharging and casting the materials in the extruder through a casting film die head, and forming to obtain a primary foaming adhesive film, CO 2 The gas injection flow rate of the supercritical fluid is 0.008mL/min;
s3: and (3) drawing the primary foamed adhesive film obtained in the step (S2) onto a drawing roller for longitudinal drawing, cooling the primary foamed adhesive film by a cooling roller for shaping and curing, and cutting and rolling to obtain the foamed EVA adhesive film with the thickness of 600 mu m for packaging the solar cell.
Performance testing
The light weight EVA adhesive films for solar cell encapsulation obtained in examples 1 to 6 and comparative examples 1 to 6 of the present invention were subjected to the relevant performance tests, and the test results are shown in Table 1.
The test method comprises the following steps:
(1) Unit gram weight: the weight per unit area of the EVA adhesive film with the thickness of 600 mu m.
(2) Water vapor transmission rate: the tests were carried out with reference to the method described in GB/T1037-2021.
(3) Melting temperature: the DSC test is adopted, and the test method comprises the following steps: weighing 5-10mg of sample, placing the sample in a crucible, keeping the temperature for 3min, then cooling to 30 ℃ at the cooling rate of 10 ℃/min, then heating to 180 ℃ at the rate of 10 ℃/min, and recording a DSC temperature rise and fall curve.
(4) Elongation at break, tensile strength: the test speed is 500mm/min according to the test of a GB/T1040-2018 plastic tensile test method.
TABLE 1
| Performance of | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 |
| Unit gram weight (g/m) 2 ) | 317 | 315 | 318 | 316 | 318 | 317 | 576 | 322 | 528 | 570 | 407 | 311 |
| Water vapor transmission rate (g/(m) 2 ·24h)) | 9.3 | 8.9 | 9.7 | 9.9 | 9.5 | 9.5 | 14.1 | 13.8 | 14.1 | 9.2 | 9.9 | 14.6 |
| Melting temperature (. Degree.C.) | 93.7 | 95.2 | 90.8 | 92.1 | 90.3 | 91.1 | 69.8 | 78.3, double Tg Peak | 70.0 | 95.2 | 92.6 | 66.4 |
| Elongation at Break (%) | 374 | 356 | 383 | 344 | 359 | 331 | 898 | 289 | 754 | 664 | 304 | 433 |
| Tensile Strength (MPa) | 19.8 | 20.0 | 17.5 | 17.1 | 17.6 | 17.6 | 15.5 | 14.1 | 14.9 | 21.2 | 17.3 | 14.6 |
The data in table 1 show that the light EVA adhesive film for packaging the solar cell, provided by the invention, not only solves the problems that when the low-gram-weight EVA adhesive film in the prior art is actually applied in the photovoltaic industry, the thickness of the EVA adhesive film is reduced, and a welding strip is protruded to burst the adhesive film during lamination, so that the solar cell is invalid or the overall service life is reduced. The light EVA adhesive film for packaging the solar cell, which is obtained by the invention, has higher melting temperature and is very beneficial to prolonging the service life of the solar cell.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (8)
1. The light EVA adhesive film for packaging the solar cell is characterized by comprising the following raw materials in parts by weight:
100 parts of EVA/PP resin;
0.5-2 parts of a silane coupling agent;
0.5-3 parts of a crosslinking agent;
0.5-2 parts of light stabilizer;
0.1-0.5 part of antioxidant;
the preparation method of the EVA/PP resin comprises the following steps:
(1) Uniformly mixing EVA resin, PP and antioxidant 1010, adding the mixture into an internal mixer, mixing for 5min at 175-185 ℃, adding triallyl isocyanurate, continuously mixing for 5min, discharging to obtain a mixture, and standing for 24h;
(2) Placing the mixture after standing on a vulcanizing press at 175-185 ℃, preheating for 5min, maintaining the pressure for 5min, keeping the pressure at 2MPa, then cold-pressing to room temperature, demoulding to obtain a sheet with the thickness of 10mm multiplied by 1mm, sealing the sheet with a PE film, and irradiating with an electron beam accelerator to obtain a target product;
the weight ratio of EVA, PP, antioxidant 1010 and triallyl isocyanurate is (75-85) g: (15-25) g:0.2g:2g of the total weight.
2. The light EVA adhesive film for solar cell encapsulation according to claim 1, wherein: the VA content in the EVA resin is 28%.
3. The light EVA adhesive film for solar cell encapsulation according to claim 1, wherein: the irradiation dose is 50-150kGy, and the irradiation time is 10-30s.
4. The light EVA adhesive film for solar cell encapsulation according to claim 1, wherein: the silane coupling agent comprises at least one of 3- (methacryloyloxy) propyl trimethoxy silane, vinyl trimethoxy silane and vinyl tri (2-methoxyethoxy) silane.
5. The light EVA adhesive film for solar cell encapsulation according to claim 1, wherein: the cross-linking agent comprises one or more of tert-butyl peroxy-2-ethylhexyl carbonate, dicumyl peroxide, triallyl isocyanurate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate or diallyl phthalate.
6. The light EVA adhesive film for solar cell encapsulation according to claim 1, wherein: the light stabilizer comprises at least one of a light stabilizer UV292, a light stabilizer UV770 or an ultraviolet light absorber UVB-2.
7. The light EVA adhesive film for solar cell encapsulation according to claim 1, wherein: the antioxidant comprises one or more of phenol antioxidant, thioester antioxidant and phosphite antioxidant.
8. The light EVA adhesive film for solar cell encapsulation according to any one of claims 1 to 7, wherein: the preparation method comprises the following steps:
s1: sequentially adding EVA/PP resin, a silane coupling agent, a crosslinking agent, a light stabilizer and an antioxidant raw material into a mixer according to the formula amount, and mixing and stirring for 2-3h at the temperature of 80 ℃ and the rotating speed of 50-100rpm to obtain a mixed raw material;
s2: placing the mixed raw material obtained in the step S1 in a double-screw extruder, melting, blending and extruding at the temperature of 90-110 ℃ and the rotating speed of 45-50rpm, and continuously injecting CO into the second section of a charging barrel of the extruder 2 Until the material in the extruder is discharged and cast through a cast film die head, and a primary foaming glue film is obtained by molding, wherein CO is 2 The gas injection flow rate of the supercritical fluid is 0.01mL/min; the diameter of a screw of the extruder is 35mm, and the length-diameter ratio is 40/1;
s3: and (3) drawing the primary foaming adhesive film obtained in the step (S2) to a drawing roller for longitudinal drawing, cooling the primary foaming adhesive film to be shaped and solidified by a cooling roller, and cutting and rolling to obtain the light EVA adhesive films with different thicknesses for packaging the solar cells.
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| CN116855191A (en) * | 2023-09-01 | 2023-10-10 | 苏州弘道新材料有限公司 | High-impact adhesive film and preparation method thereof |
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| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: No. 5399 Jiaotong Road, Wujiang District, Suzhou City, Jiangsu Province, 215000 Patentee after: Suzhou Yisheng Optical Materials Co.,Ltd. Address before: No. 168 Jiaotong North Road, Wujiang Economic and Technological Development Zone, Suzhou City, Jiangsu Province Patentee before: Suzhou Yisheng Optical Materials Co.,Ltd. |