CN111635707A - Photovoltaic white glue film - Google Patents

Photovoltaic white glue film Download PDF

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CN111635707A
CN111635707A CN202010538761.8A CN202010538761A CN111635707A CN 111635707 A CN111635707 A CN 111635707A CN 202010538761 A CN202010538761 A CN 202010538761A CN 111635707 A CN111635707 A CN 111635707A
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reflecting layer
white
reflectivity
square meter
photovoltaic
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CN111635707B (en
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仇桂芬
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/04—Homopolymers or copolymers of ethene
    • C09J123/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/04—Homopolymers or copolymers of ethene
    • C09J123/08—Copolymers of ethene
    • C09J123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C09J123/0853—Vinylacetate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/322—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of solar panels
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/33—Applications of adhesives in processes or use of adhesives in the form of films or foils for batteries or fuel cells
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • 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

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a photovoltaic white glue film, which consists of a white glue film reflecting layer I and a white glue film reflecting layer II which are arranged in a laminated manner, wherein the reflectivity of the reflecting layer I is 75-95%, and the reflectivity of the reflecting layer II is 10-85%; the reflectivity of the reflecting layer I is higher than that of the reflecting layer II. The two adhesive film reflecting layers are compounded through a compounding process, or: and laying the reflecting layer on the back of the battery piece, and laminating and pressing. The white adhesive film is added with a reflective filler; the reflective filler is selected from titanium dioxide, silicon dioxide, glass beads and the like. The composite photovoltaic white adhesive film can reduce the cost of the reflective filler (the addition amount of the reflective filler in the adhesive film with low reflectivity is lower, or the reflective adhesive film is prepared by adopting the reflective filler with low cost) on the premise of the same power gain, or obtain higher or the same power gain on the premise of the same or lower addition amount of the reflective filler, and has very high economic value and popularization value.

Description

Photovoltaic white glue film
Technical Field
The invention relates to a photovoltaic white adhesive film, and belongs to the technical field of photovoltaic adhesive films.
Background
With environmental pollution and energy crisis, efforts are being made to develop new renewable energy sources. The solar energy is more and more paid attention to the reasonable utilization of the solar energy because of inexhaustible renewable energy. Solar cells based on photoelectric conversion technology are an important direction. Therefore, it is a long-felt effort of researchers in this field to improve the photoelectric conversion efficiency of solar cells and reduce the cost, so that the solar cells have the cost equivalent to that of conventional energy sources such as coal power.
The high-reflection white glue film is a research hotspot, and light rays passing through the gap of the reflection battery piece can be reabsorbed by the battery, so that the power is improved. However, after the white reflective filler is added, the white reflective filler overflows to the surface of the battery piece during lamination, and through continuous improvement of industry researchers, the overflow of the white reflective filler can be avoided by various methods, but the white reflective filler with a good reflective effect is high in price, and the cost is increased. In the prior art, researches on white high-reflection adhesive films mostly focus on improving the reflectivity and the addition proportion of the white high-reflection adhesive films, how to realize higher power gain by using lower addition proportion, and the reflectivity and the power gain effect of the high-reflection adhesive films do not have an absolute linear relationship, so that related research results are few.
Disclosure of Invention
In view of the above prior art, the present invention provides a photovoltaic white glue film, which has higher output power and lower cost.
The invention is realized by the following technical scheme:
a photovoltaic white glue film comprises a white glue film reflecting layer I and a white glue film reflecting layer II which are arranged in a laminated mode, wherein the reflectivity of the reflecting layer I is 75% -95%, and the reflectivity of the reflecting layer II is 10% -85%; the reflectivity of the reflecting layer I is higher than that of the reflecting layer II (when the reflecting layer I is applied, the reflecting layer I is closer to the battery piece than the reflecting layer II).
Further, the white adhesive film reflecting layer is a layer of white adhesive film, and the main resin of the white adhesive film is white EVA (ethylene vinyl acetate) or/and white POE (polyolefin elastomer); or: the white glue film reflecting layer is composed of more than two layers of white glue films.
Further, the two reflective layers are compounded by a compounding process such as hot pressing, ultrasonic pressing, mechanical rolling, coating, adhesive bonding, co-extrusion compounding, or: when the battery is applied, the battery is directly laid on the back of the battery sheet for lamination, and the battery sheet is pressed by the temperature and pressure during lamination.
Further, the white adhesive film is added with an inorganic reflective filler, and the reflective filler is selected from any one or more than two of titanium dioxide, silicon dioxide, glass beads, calcium carbonate, barium sulfate, talcum powder, aluminum oxide, white carbon black, talcum powder, feldspar powder, zinc oxide, kaolin, montmorillonite and zirconia.
Further, the reflectivity of the reflecting layer I is 83% -92%; the reflectivity of the reflecting layer II is 10-82%.
Still further, the reflectivity of the reflecting layer I is 81% -90% or 90% -92%.
Furthermore, the reflectivity of the reflecting layer II is 10-28%, or 10-40%, or 10-57%, or 10-78%, or 10-82%, or 28-40%, or 28-57%, or 28-78%, or 28-82%, or 40-57%, or 40-78%, or 40-82%, or 57-78%, or 57-82%, or 78-82%.
Furthermore, the thickness of the reflecting layer I is less than or equal to half of the whole thickness of the photovoltaic white glue film.
The photovoltaic white adhesive film is applied to preparation/use as a solar photovoltaic cell packaging adhesive film.
The composite photovoltaic white adhesive film is composed of two layers, the whole adhesive film is white, the reflective filler is unevenly distributed in the adhesive film, the reflectivity of the surface close to the battery piece is high, and the reflectivity of the surface far away from the battery piece is low. When the packaging adhesive film is used, the overall reflectivity of the two layers is improved compared with that of a single layer, and compared with the existing same-gram-weight high-reflection white solar cell packaging adhesive film (generally, the single layer is added with white reflective filler, and the overall reflectivity is high), the overall reflectivity is low, but the obtained power gain effect is better. The main reasons may be: reflection stratum II is through adding the reflection of light filler of lower refracting index or reducing the quantity of reflection of light filler, though the reflectivity reduces, but light changes at its inside propagation path, and the light propagation angle that reflects back becomes more dispersed, and through the design of two-layer or above different reflection stratum, light has changed the reflection path of light in glued membrane inside like this for the light angle that reflects near the battery piece is more many units, more disperses, is absorbed by the battery piece more easily. Because the film has certain light absorption and blocking, the reflecting layer I is thinner on the premise of ensuring certain reflectivity, which is more favorable for reducing the reflected light propagation path of the reflecting layer II, so that the reflected light can reach the cell more easily.
In the prior art, the relation between the reflectivity and the power gain is rarely studied, and generally, the power gain is higher when the reflectivity is higher on the premise of overcoming the problem of glue overflow on the surface of a battery piece (the glue overflow can cause the local shielding of the battery piece and influence the power generation effect). However, the design obtained based on experiments can obtain a higher power gain effect under the condition of the same or lower reflectivity, can reduce the cost of the reflective filler on the premise of the same power gain (the addition amount of the reflective filler in the adhesive film with low reflectivity is lower, or the reflective adhesive film prepared by the reflective filler with low cost can reduce the cost no matter what the reflective adhesive film is, or can obtain higher or same power gain on the premise of the same or lower addition amount of the reflective filler, and has high economic value and popularization value.
The various terms and phrases used herein have the ordinary meaning as is well known to those skilled in the art. The English abbreviations such as EVA, POE, PE, PET, etc. have the meanings commonly used in the field, and have clear and unambiguous meanings.
Detailed Description
The present invention will be further described with reference to the following examples. However, the scope of the present invention is not limited to the following examples. It will be understood by those skilled in the art that various changes and modifications may be made to the invention without departing from the spirit and scope of the invention.
The instruments, reagents, materials and the like used in the following examples are conventional instruments, reagents, materials and the like in the prior art and are commercially available in a normal manner unless otherwise specified. Unless otherwise specified, the experimental methods, detection methods, and the like described in the following examples are conventional experimental methods, detection methods, and the like in the prior art.
The reflectivity test method comprises the following steps:
the test method refers to a spectrophotometer method with an integrating sphere in the standard GB/T29848 ethylene-vinyl acetate copolymer (EVA) adhesive film for packaging photovoltaic modules. And taking an average value of test data in a wavelength band of 400 nm-700 nm.
The maximum power test method comprises the following steps:
the test method refers to the design identification and design of crystalline silicon photovoltaic modules for ground in IEC 61215. In order to avoid power test deviation, the battery pieces are all made of the same batch of battery pieces of the same manufacturer. The test conditions were maintained at AM1.5, irradiance of 1000W/square meter, temperature 25 deg.C, and humidity 50%.
The reflective filler is mixed with EVA resin, and is extruded and granulated by a double screw to be processed into 70 percent EVA white master batch for use.
In order to avoid the glue film from overflowing and blocking the battery piece, thereby causing the power test to have deviation, the raw material selection and the process of the reflective layer refer to the prior art (for example, the technology disclosed in chinese patent CN 103865420A, CN 104745109 a), and are not described again. The raw materials are fully mixed, put into a screw, heated, melted and stirred, and then extruded, stretched, cooled and formed into a film.
In the embodiment, the naming mode of the reflecting layer is carried out according to the using method when the packaging adhesive film is laid, the reflecting layer directly contacted with the cell piece is named as a reflecting layer I, and the reflecting layer close to the reflecting layer I and far away from the cell piece is named as a reflecting layer II.
Example 1
The utility model provides a white glued membrane of photovoltaic, comprises white glued membrane reflection stratum I, white glued membrane reflection stratum II that range upon range of setting, wherein, reflection stratum I comprises two-layer white glued membrane: one layer of main raw material is white EVA, the addition amount of titanium dioxide is 30 percent (weight percentage, the same below), and the weight of each square meter is 40 g; the other layer of main raw material is white PE, the addition amount of titanium dioxide is 25%, and the weight per square meter is 40 g; the two films are arranged together in a co-extrusion mode (the two raw materials are respectively melted and stirred by a screw rod and co-extruded into a film at 160-170 ℃), the reflectivity of the co-extruded film (the reflecting layer I) is 90.8%, and the thickness of the co-extruded film is 76 microns. The main raw material of the reflecting layer II is white EVA, the adding amount of the hollow glass beads is 1%, the weight of each square meter is 300 g, and the reflectivity is 10%. The reflecting layer I and the reflecting layer II are arranged together in a hot pressing mode (a white PE film is in contact with the reflecting layer II), the heating temperature is 85 ℃, and the reflecting layer II is heated to the compounding temperature by means of an infrared lamp tube and then immediately pressed by a silica gel roller. The thickness after lamination was 332 μm.
Example 2
The utility model provides a white glued membrane of photovoltaic, comprises white glued membrane reflection stratum I, white glued membrane reflection stratum II that range upon range of setting, wherein, reflection stratum I comprises two-layer white glued membrane: one layer of main material is white EVA, the adding amount of titanium dioxide is 40%, and the weight of each square meter is 30 g; the other layer is a white PET film, the addition amount of titanium dioxide is 15%, and the weight of each square meter is 18 g, the white EVA film is arranged on the white PET film in a coating mode, after coating, the reflectivity of the reflecting layer I is 81%, and the thickness of the reflecting layer I is 49 micrometers. The reflecting layer II is a white EVA film, the addition amount of titanium dioxide is 2.4%, the weight per square meter is 332 g, and the reflectivity is 78%. The reflecting layer I is directly laid on the reflecting layer II (a white PET film is contacted with the reflecting layer II), and the two reflecting layers are combined into a whole by virtue of the pressure and the temperature during lamination. The total thickness of the reflecting layer I and the reflecting layer II is 330 microns.
Example 3
The utility model provides a white glued membrane of photovoltaic, comprises white glued membrane reflection stratum I, white glued membrane reflection stratum II that range upon range of setting, wherein, reflection stratum I comprises two-layer white glued membrane: the main raw material of the first layer is white EVA, the adding amount of titanium dioxide is 30%, and the weight per square meter is 40 g; the main raw material of the second layer is white EVA, the adding amount of titanium dioxide is 30%, and the weight per square meter is 40 g; the two films are arranged together in a co-extrusion mode (the two raw materials are respectively melted and stirred by a screw rod and co-extruded into a film at 160-170 ℃), the reflectivity of the co-extruded film (the reflecting layer I) is 91%, and the thickness of the co-extruded film is 74 micrometers. The main raw material of the reflecting layer II is white EVA, the adding amount of the hollow glass beads is 7%, the weight of each square meter is 300 g, and the reflectivity is 28%. The reflecting layer I and the reflecting layer II are arranged together in a hot pressing mode (the second white EVA film is in contact with the reflecting layer II), the heating temperature is 80 ℃, and the reflecting layer II is heated by the infrared lamp tube to the compounding temperature and then immediately pressed by a silica gel roller. The thickness after lamination was 332 μm. The main raw materials of the first layer, the second layer and the reflecting layer II are EVA resin, and the melt indexes are respectively as follows: 4. 0.35 and 0.7 (units are both g/10 min).
Example 4
The utility model provides a white glued membrane of photovoltaic, comprises white glued membrane reflection stratum I, white glued membrane reflection stratum II that range upon range of setting, wherein, reflection stratum I comprises two-layer white glued membrane: the main raw material of one layer is white EVA, the adding amount of titanium dioxide is 35%, and the weight per square meter is 40 g; the other layer of main raw material is white PE, the addition amount of titanium dioxide is 35%, and the weight per square meter is 40 g; the two films are arranged together in a co-extrusion mode (the two raw materials are respectively melted and stirred by a screw rod and co-extruded into a film at 160-170 ℃), the reflectivity of the co-extruded film (the reflecting layer I) is 92%, and the thickness of the co-extruded film is 74 micrometers. The main raw material of the reflecting layer II is white EVA, the addition amount of calcium carbonate is 16%, the weight per square meter is 300 g, and the reflectivity is 40%. The reflecting layer I and the reflecting layer II are arranged together in a hot pressing mode (a white PE film is in contact with the reflecting layer II), the heating temperature is 85 ℃, and the reflecting layer II is heated to the compounding temperature by means of an infrared lamp tube and then immediately pressed by a silica gel roller. The thickness after lamination was 268 μm.
Example 5
A photovoltaic white adhesive film comprises a white adhesive film reflecting layer I and a white adhesive film reflecting layer II which are arranged in a laminated mode, wherein the main material of the reflecting layer I is white EVA, the content of titanium dioxide is 33%, the weight per square meter is 90 g, the reflectivity of an individual test is 91.8%, and the thickness is 83 micrometers. The main material of the reflecting layer II is white EVA, the addition amount of calcium carbonate is 24%, the weight per square meter is 290 g, and the reflectivity of a single test is 57%. The reflecting layer I and the reflecting layer II are mechanically pressed by a roller with a steel nail shape, the steel nail is rolled into the reflecting layer II from the reflecting layer I, so that the two reflecting layers are combined together, and the combined thickness is 248 microns.
Example 6
A photovoltaic white adhesive film comprises a white adhesive film reflecting layer I and a white adhesive film reflecting layer II which are arranged in a laminated mode, wherein the main material of the reflecting layer I is white EVA, the content of titanium dioxide is 10%, the weight per square meter is 190 grams, the reflectivity of an individual test is 90%, and the thickness is 149 micrometers. The main material of the reflecting layer II is white EVA, the addition amount of calcium carbonate is 8%, the addition amount of titanium dioxide is 2%, the weight of each square meter is 190 g, the reflectivity of a single test is 82%, and the thickness is 162 micrometers. The reflecting layer I and the reflecting layer II are combined together through a co-extrusion process.
Comparative example 1: the white highly reflective coating film available in the market is available from several manufacturers, and can overcome the problems of overflow and wrinkle of the white EVA coating film, such as F806W from foster applied materials of hangzhou, B601W from pajama-hundredth-year-old thin film technologies of gmbh, and S201W from shanghai-hai-youwei new materials of gmbh. In the comparative example, Baijia B601W was selected and purchased, and the overflow phenomenon was avoided, and the tested titanium dioxide content was 8%, and the reflectivity was 93.5%. The white pigment is uniformly distributed in the adhesive film by microscope observation without layering treatment. The grammage (weight per square meter) was chosen to be 380 grams per square meter.
Comparative example 2: the back of the cell sheet is packaged by a fully transparent EVA adhesive film without any reflective filler, and the weight per square meter is 380 g.
Experiment of
The power test results of the module made of the Hongxi poly-PERC battery piece are shown in Table 1 (full-sheet module) by using the adhesive films of the examples and the comparative example 1 as the adhesive film on the back side of the battery piece, and the test results are completely consistent with those of the other materials. The output power of the assembly is tested for three times to obtain the average value, and the assembly is placed at the same position of the sunlight simulator during each test, so that the deviation caused by uneven light is avoided; the reflectivity test method is that 5 measurement areas in the four corners and the middle of a 1 square meter sample are taken for reflectivity test, and the average value is taken. The numerical difference caused by accidental factors or errors can be eliminated through multiple tests.
Watch 1 (double glass component)
Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative example 1
Overall reflectivity of cell face 91.30％ 90％ 92.10％ 92.80％ 93.1％ 93％ 93.50％
Component output power (W) 348.3 347.2 348.1 348.2 348.6 348.5 346.9
Overflow phenomenon Is free of Is free of Is free of Is free of Is free of Is free of Is free of
The price of the titanium dioxide is expensive, and particularly, the price of the titanium dioxide produced abroad is higher than that of the main resin of the packaging adhesive film. The price of the reflective filler calcium carbonate and the glass beads with lower refractive index used in the embodiment is lower than that of the main resin of the packaging adhesive film, and the reflective filler calcium carbonate and the glass beads with lower refractive index are added into the packaging adhesive film to replace the main resin of the packaging adhesive film and reduce the consumption of the main resin, so the embodiment has the effect of reducing the cost.
The market prices of various raw materials used in the examples and comparative examples of the present invention are, in order: the titanium dioxide is rutile type, the market price is 21000-25000 yuan/ton, and the price is calculated according to 25000 yuan/ton; the price of the resin raw material is 10000-16000 yuan/ton, and is calculated according to 14000 yuan/ton; the price of barium sulfate is about 5000-8000 yuan/ton, calculated according to 8000 yuan/ton; the price of the hollow glass micro-beads is about 7000 yuan/ton; the price of calcium carbonate is about 800 yuan/ton. The cost is shown in table 2.
TABLE 2
Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative example 1
Titanium dioxide dosage per square meter 22 22.67 24 28 29.7 22.8 30.4
Resin dosage per square meter 344 346 325 295 272 331 339
Glass bead dosage per square meter 3 0 21 0 0 0 0
Calcium carbonate dosage per square meter 0 0 0 48 69.6 15.2 0
Total cost per square meter 5.39 5.41 5.29 4.86 4.61 5.22 5.50
As is clear from Table 2, the cost per square meter of comparative example 1 is higher than that of examples 1, 2, 3, 4, 5 and 6. Although the cost per square meter is not obvious, the packaging adhesive film market volume in the industry is huge, and a little cost reduction can bring considerable economic benefits. Through continuous efforts in the field, the photovoltaic power generation cost approaches the traditional thermal power cost, the cost of each link of the industry is optimized, and even little cost reduction is difficult to achieve.
As can be seen from table 1, although the adhesive film of comparative example 1 has a higher total reflectance, the solar module does not exhibit a correspondingly higher output, but instead the solar module has a lower cost and a higher output of each of the examples having a lower total reflectance.
Examples 1, 2, 3, 4, 5, and 6 were improved by 1.4W (0.4%), 0.3W (0.09%), 1.2W (0.35%), 1.3W (0.37%), 1.7W (0.49%), and 1.6W (0.46%) respectively, as compared with comparative example 1. Although the difference between the output power of each example and the output power of comparative example 1 is small, in the field of developing mature solar photovoltaic cells, the output power is difficult to be increased, even the power increase of 0.1% is difficult, and the cost is also the same. Moreover, it can be expected that the content of titanium dioxide in each embodiment can be properly reduced, so that the final power effect is slightly reduced to be equal to that of comparative example 1, and the cost is further reduced on the basis of achieving the same power gain effect.
This phenomenon (lower reflectivity but higher output power for embodiments of the invention) is more pronounced in the half-chip module. The half-chip assembly has larger cell gap area, so that the reflection effect of the high-reflection packaging adhesive film is more obvious, and the power gain is higher. Table 3 shows the power test results of the half-chip module, the module model is a half-chip module with 166 dimensions, the adhesive films prepared in each example and comparative example are used as the back adhesive film of the battery chip, and other materials are completely consistent.
Watch 3 (Single glass component)
Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative example 1 Comparative example 2
Output power of the assembly 439W 438W 439.3W 439.4W 439.6W 439.6W 435.5W 431.3W
Overflow phenomenon Is free of Is free of Is free of Is free of Is free of Is free of Is free of -
Lifting amount of the catalyst in comparison with that in comparative example 1 3.5 2.5 3.8 3.9 4.1 4.1
Improvement rate of the comparative example 1 0.80％ 0.57％ 0.87％ 0.90％ 0.94％ 0.94％
Lifting amount of the catalyst in comparison with that in comparative example 2 7.7 6.7 8.0 8.1 8.3 8.3
Improvement rate of the comparative example 2 1.79％ 1.55％ 1.85％ 1.88％ 1.92％ 1.92％
As can be seen from table 3, the output powers of examples 1, 2, 3, 4, 5, and 6 are respectively increased by 3.5W (0.8%), 2.5W (0.57%), 3.8W (0.87%), 3.9W (0.9%), 4.1W (0.94%), and 4.1W (0.94%), compared with comparative example 1, by 7.7W (1.79%), 6.7W (1.55%), 8W (1.85%), 8.1W (1.88%), 8.3W (1.92%), and have a large increase range, a significant effect, and extremely high application value and popularization potential.
The above examples are provided to those of ordinary skill in the art to fully disclose and describe how to make and use the claimed embodiments, and are not intended to limit the scope of the disclosure herein. Modifications apparent to those skilled in the art are intended to be within the scope of the appended claims.

Claims (10)

1. A photovoltaic white glue film is characterized in that: the reflective coating comprises a white adhesive film reflecting layer I and a white adhesive film reflecting layer II which are arranged in a laminated manner, wherein the reflectivity of the reflecting layer I is 75% -95%, and the reflectivity of the reflecting layer II is 10% -85%; the reflectivity of the reflecting layer I is higher than that of the reflecting layer II.
2. The photovoltaic white glue film according to claim 1, characterized in that: the white adhesive film reflecting layer is a layer of white adhesive film; or: the white glue film reflecting layer is composed of more than two layers of white glue films;
the main resin of the white adhesive film is white EVA or/and white POE.
3. The photovoltaic white glue film according to claim 1 or 2, characterized in that: the two adhesive film reflecting layers are compounded through a compounding process, or: and laying the reflecting layer on the back of the battery piece, and laminating and pressing.
4. The photovoltaic white glue film according to claim 3, characterized in that: the composite process is selected from hot pressing, ultrasonic pressing, mechanical rolling, coating, adhesive bonding and co-extrusion.
5. The photovoltaic white glue film according to any one of claims 1 to 4, wherein: the white adhesive film is added with inorganic reflective filler; the reflective filler is selected from one or more than two of titanium dioxide, silicon dioxide, glass beads, calcium carbonate, barium sulfate, talcum powder, aluminum oxide, white carbon black, talcum powder, feldspar powder, zinc oxide, kaolin, montmorillonite, zirconia and the like.
6. The photovoltaic white glue film according to any one of claims 1 to 5, wherein: the reflectivity of the reflecting layer I is 83% -92%;
or/and: the reflectivity of the reflecting layer II is 10-82%.
7. The photovoltaic white glue film according to claim 1 or 6, characterized in that: the reflectivity of the reflecting layer I is 81% -90% or 90% -92%;
or/and: the reflectivity of the reflecting layer II is 10-28%, or 10-40%, or 10-57%, or 10-78%, or 10-82%, or 28-40%, or 28-57%, or 28-78%, or 28-82%, or 40-57%, or 40-78%, or 40-82%, or 57-78%, or 57-82%, or 78-82%.
8. The photovoltaic white glue film according to any one of claims 1 to 7, wherein: the thickness of the reflecting layer I is less than or equal to half of the whole thickness of the photovoltaic white glue film.
9. The photovoltaic white glue film according to any one of claims 1 to 8, wherein: the reflecting layer I is composed of two layers of white glue films: one layer of main raw material is white EVA, the addition amount of titanium dioxide is 30%, and the weight per square meter is 40 g; the other layer of main raw material is white PE, the addition amount of titanium dioxide is 25%, and the weight per square meter is 40 g; the two films are arranged together in a co-extrusion mode, the reflectivity of the reflecting layer I is 90.8%, and the thickness of the reflecting layer I is 76 microns; the main raw material of the reflecting layer II is white EVA, the adding amount of the hollow glass beads is 1%, the weight of each square meter is 300 g, and the reflectivity is 10%; the reflecting layer I and the reflecting layer II are arranged together in a hot pressing mode, and the thickness of the reflecting layer I and the reflecting layer II is 332 microns after the reflecting layer I and the reflecting layer II are pressed together;
or: the reflecting layer I is composed of two layers of white glue films: one layer of main material is white EVA, the adding amount of titanium dioxide is 40%, and the weight of each square meter is 30 g; the other layer is a white PET film, the addition amount of titanium dioxide is 15%, and the weight of each square meter is 18 g, the white EVA film is arranged on the white PET film in a coating mode, after coating, the reflectivity of the reflecting layer I is 81%, and the thickness of the reflecting layer I is 49 micrometers; the reflecting layer II is a white EVA film, the addition amount of titanium dioxide is 2.4%, the weight per square meter is 332 g, and the reflectivity is 78%; the reflecting layer I is directly laid on the reflecting layer II and is laminated and combined into a whole;
or: the reflecting layer I is composed of two layers of white glue films: the main raw material of the first layer is white EVA, the adding amount of titanium dioxide is 30%, and the weight per square meter is 40 g; the main raw material of the second layer is white EVA, the adding amount of titanium dioxide is 30%, and the weight per square meter is 40 g; the two films are arranged together in a co-extrusion mode, the reflectivity of the reflecting layer I is 91%, and the thickness of the reflecting layer I is 74 micrometers; the main raw material of the reflecting layer II is white EVA, the addition amount of the hollow glass beads is 7%, the weight of each square meter is 300 g, and the reflectivity is 28%; the reflecting layer I and the reflecting layer II are arranged together in a hot pressing mode;
or: the reflecting layer I is composed of two layers of white glue films: the main raw material of one layer is white EVA, the adding amount of titanium dioxide is 35%, and the weight per square meter is 40 g; the other layer of main raw material is white PE, the addition amount of titanium dioxide is 35%, and the weight per square meter is 40 g; the two films are arranged together in a co-extrusion mode, the reflectivity of the reflecting layer I is 92%, and the thickness of the reflecting layer I is 74 micrometers; the main raw material of the reflecting layer II is white EVA, the addition amount of calcium carbonate is 16%, the weight of each square meter is 300 g, and the reflectivity is 40%; the reflecting layer I and the reflecting layer II are arranged together in a hot pressing mode;
or: the main material of the reflecting layer I is white EVA, the content of titanium dioxide is 33%, the weight per square meter is 90 g, the reflectivity is 91.8%, and the thickness is 83 micrometers; the main material of the reflecting layer II is white EVA, the addition amount of calcium carbonate is 24%, the weight per square meter is 290 g, and the reflectivity is 57%; the reflecting layer I and the reflecting layer II are mechanically pressed together by means of a roller with a steel nail shape;
or: the main material of the reflecting layer I is white EVA, the content of titanium dioxide is 10%, the weight per square meter is 190 g, the reflectivity is 90%, and the thickness is 149 micrometers; the main material of the reflecting layer II is white EVA, the addition amount of calcium carbonate is 8%, the addition amount of titanium dioxide is 2%, the weight per square meter is 190 g, the reflectivity is 82%, and the thickness is 162 micrometers; the reflecting layer I and the reflecting layer II are combined together through a co-extrusion process.
10. The use of the photovoltaic white adhesive film of any one of claims 1 to 9 in the preparation/application of the photovoltaic white adhesive film as a solar photovoltaic cell packaging adhesive film.
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CN114854323A (en) * 2022-05-30 2022-08-05 盐城百佳年代薄膜科技有限公司 Four-layer high-reflection non-crosslinked photovoltaic adhesive film and preparation method thereof
CN114958240A (en) * 2021-06-30 2022-08-30 福斯特(嘉兴)新材料有限公司 Double-layer packaging adhesive film and photovoltaic module

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CN110837142A (en) * 2018-08-17 2020-02-25 宁波长阳科技股份有限公司 White reflective polyester film

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JP2015106028A (en) * 2013-11-29 2015-06-08 帝人デュポンフィルム株式会社 White reflective film for direct surface light source
CN103869393A (en) * 2013-12-13 2014-06-18 合肥乐凯科技产业有限公司 Reflective film for liquid crystal displayer
CN204029829U (en) * 2014-08-28 2014-12-17 陈晓征 A kind of photovoltaic module shady face packaging plastic
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CN114958240A (en) * 2021-06-30 2022-08-30 福斯特(嘉兴)新材料有限公司 Double-layer packaging adhesive film and photovoltaic module
CN114854323A (en) * 2022-05-30 2022-08-05 盐城百佳年代薄膜科技有限公司 Four-layer high-reflection non-crosslinked photovoltaic adhesive film and preparation method thereof

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