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CN111421935B - Infrared reflection polyolefin film and preparation method and application thereof - Google Patents

Infrared reflection polyolefin film and preparation method and application thereof Download PDF

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Publication number
CN111421935B
CN111421935B CN202010377521.4A CN202010377521A CN111421935B CN 111421935 B CN111421935 B CN 111421935B CN 202010377521 A CN202010377521 A CN 202010377521A CN 111421935 B CN111421935 B CN 111421935B
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polyolefin film
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compound particles
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CN111421935A (en
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朱业玲
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Shanghai Zijiang Colour Printing & Packaging Co ltd
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Shanghai Zijiang Colour Printing & Packaging Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • 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
    • H01L31/049—Protective back sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • 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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  • Thermal Sciences (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides an infrared reflection polyolefin film and a preparation method and application thereof. The infrared reflection polyolefin film comprises a composite layer, a core layer and a heat sealing layer which are sequentially laminated; the preparation raw materials of the composite layer comprise: polyolefin resin and processing aid; the core layer is prepared from the following raw materials: polyolefin resin, infrared reflective pigment, ultraviolet light stabilizer and antioxidant; the preparation raw materials of the heat sealing layer comprise: polyolefin resin and processing aids. The infrared reflection polyolefin film has high reflectivity in an infrared region, the reflectivity of the backboard manufactured by the infrared reflection polyolefin film in a 780-1100nm waveband can reach 40-60%, and the backboard has excellent ultraviolet resistance and water blocking performance.

Description

Infrared reflection polyolefin film and preparation method and application thereof
Technical Field
The invention belongs to the technical field of packaging composite preparation raw materials, and particularly relates to an infrared reflection polyolefin film and a preparation method and application thereof.
Background
The spectrum of the solar light received on the earth can be divided into three major parts according to different wavelengths, the total energy proportion occupied by each part is different, and the ultraviolet region (UV): 280 nm-380 nm, and 5 percent of total solar energy received by the floor ball; visible light region (VIS): 380 and 780nm, wherein the total solar energy received by the floor ball is about 45 percent; infrared Region (IR): 780nm-2500nm, and the occupied ball receives 50% of the total solar energy, wherein most of the energy is concentrated in 780nm-1100nm, namely in the short wave near infrared region. The solar cell absorbs sunlight with the wavelength range of 400-1100nm to generate current, and with the requirement of people on energy conservation and environmental protection, how to utilize the solar energy with higher efficiency becomes a research direction of the photovoltaic industry all the time.
At present, a white back plate, a black back plate, a transparent back plate and the like are available on the market, the white back plate contains titanium dioxide which can reflect 90% of visible light and infrared light, sunlight can be effectively utilized, the temperature of the assembly is effectively reduced, and the color is too single. The application of the transparent back plate is limited too much at present, so the black back plate is favored by the market more and more, but the pigment used in the existing black back plate is almost all carbon black, and can absorb almost all visible light and infrared light, so that the temperature of the assembly is increased, and the power generation efficiency is reduced. To improve the reflectivity of the black back plate, the reflectivity of the visible light part cannot be improved, otherwise, the color of the back plate is changed, so that it is important to design a back plate capable of reflecting in the infrared region, especially the near infrared region.
CN109713069A provides a black high-reflection solar cell backboard and a preparation method thereof, and the black high-reflection solar cell backboard comprises a weather-resistant layer, a bonding layer, a PET substrate layer and a black functional coating layer which are arranged from top to bottom in sequence. Through the selection of the black functional coating layer and the PET substrate with different reflectivity, the infrared band has very high reflectivity while the attractive effect is achieved, the solar heat reflection efficiency is increased, the component temperature is reduced, and the power generation efficiency of the cell is improved. However, the moisture permeability and the ultraviolet resistance of the back sheet of the black high-reflection solar cell back sheet using the functional coating are to be further improved.
CN110861376A discloses a polyolefin film for transparent back sheet film and a preparation method thereof. The infrared reflection polyolefin film comprises a composite layer, a core layer and a heat sealing layer which are sequentially laminated; the polyolefin film has good mechanical property and processability, excellent ultraviolet resistance, high light transmittance and insulativity, high peeling strength with PET and good bonding strength with EVA. However, the polyolefin film for transparent back sheet film cannot reflect in the infrared region, particularly in the near infrared region.
Therefore, it is important to develop a back plate capable of reflecting in the infrared region, especially in the near infrared region, to improve the reflectivity of the black back plate.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an infrared reflection polyolefin film and a preparation method and application thereof, wherein the infrared reflection polyolefin film has high reflectivity in an infrared region, and the reflectivity of the prepared backboard in a 780-1100nm wave band can reach 40-60%, and the backboard has excellent ultraviolet resistance and water blocking performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an infrared reflective polyolefin film, comprising a composite layer, a core layer and a heat seal layer, which are sequentially stacked;
the preparation raw materials of the composite layer comprise: polyolefin resin and processing aid;
the core layer is prepared from the following raw materials: polyolefin resin, infrared reflective pigment, ultraviolet light stabilizer and antioxidant;
the preparation raw materials of the heat sealing layer comprise: polyolefin resin and processing aids.
In the invention, the infrared reflection polyolefin film comprises a composite layer, a core layer and a heat sealing layer which are sequentially laminated, wherein the composite layer is a polyolefin resin layer, the composite layer is compounded with PET (polyethylene terephthalate), proper surface tension is required, the composite strength is high enough, and high water vapor barrier property is provided; the middle core layer is a blending modified material of polyolefin resin, infrared reflection pigment and ultraviolet light stabilizer, so that the film has high reflectivity in an infrared region, excellent ultraviolet resistance and water vapor barrier property, and safe and stable use of the solar cell module in a high-humidity region is met; the heat sealing layer and the composite layer are polyolefin resin layers, so that the uniformity of the reflectivity of the infrared reflection polyolefin film in an infrared region is further ensured, the polyolefin resin is easy to seal, and the sealing strength is high.
Preferably, the infrared reflective polyolefin film has a thickness of 50 to 150 μm. For example, it may be 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, or the like.
Preferably, the thickness ratio of the composite layer to the core layer to the heat-sealing layer is 1 (2-3) to (1-2), and preferably 1 (2-3) to 1.
Wherein "2-3" can be, for example, 2, 2.2, 2.4, 2.6, 2.8, 3, etc.;
here, "1-2" may be, for example, 1, 1.2, 1.4, 1.6, 1.8, 2, etc.
Preferably, the raw materials for preparing the composite layer comprise the following components in percentage by mass, based on 100% of the total mass of the raw materials for preparing the composite layer: 80-99.9% of polyolefin resin and 0.1-20% of processing aid.
The content of the polyolefin resin is 80 to 99.9%, for example, 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 98%, 99%, 99.5%, 99.9%, etc., based on 100% by mass of the total raw materials for producing the composite layer.
The content of the processing aid is 0.1 to 20% based on 100% of the total mass of the raw materials for producing the composite layer, and may be, for example, 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, 2.5%, 3%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, or the like.
Preferably, the raw material for preparing the composite layer further comprises any one or a combination of at least two of an infrared reflection pigment, an ultraviolet light stabilizer and an antioxidant.
Preferably, the addition amount of the infrared reflective pigment is 1 to 10% of the total mass of the raw materials for preparing the composite layer, and may be, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or the like.
Preferably, the amount of the ultraviolet stabilizer added is 0.5 to 1% of the total mass of the raw materials for preparing the composite layer, and may be, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or the like.
Preferably, the antioxidant is added in an amount of 0.5 to 1% by mass, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% or the like, based on the total mass of the raw materials for preparing the composite layer.
Preferably, the core layer is prepared from the following raw materials by mass percent, based on 100% of the raw materials for preparing the core layer: 75-95% of polyolefin resin, 1-20% of infrared reflection pigment, 0.5-5% of ultraviolet light stabilizer and 0.5-1% of antioxidant.
The content of the polyolefin resin is 75 to 95%, for example, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95% or the like, based on 100% by mass of the raw material for producing the core layer.
The content of the infrared reflective pigment is 1 to 20% based on 100% by mass of the raw material for producing the core layer, and may be, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, or the like.
The content of the ultraviolet stabilizer is 0.5 to 5% by mass of 100% by mass of the raw material for producing the core layer, and may be, for example, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or the like.
The content of the antioxidant is 0.5 to 1%, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, etc., based on 100% by mass of the raw material for preparing the core layer.
Preferably, the heat-sealing layer comprises the following raw materials by mass percent, based on 100% of the heat-sealing layer, by mass percent: 60-99.9% of polyolefin resin and 0.1-40% of processing aid.
The content of the polyolefin resin is 60 to 99.9%, for example, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 99%, 99.9% or the like, based on 100% by mass of the raw material for producing the heat-seal layer.
The content of the processing aid is 0.1 to 40% by mass of 100% by mass of the raw material for producing the heat-sealable layer, and may be, for example, 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40% or the like.
Preferably, the raw materials for preparing the heat-sealing layer also comprise any one or a combination of at least two of infrared reflection pigments, ultraviolet light stabilizers or antioxidants.
Preferably, the infrared reflective pigment is added in an amount of 1 to 10% by mass based on the total mass of the raw materials for producing the heat-seal layer, and may be, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc.
The amount of the ultraviolet light stabilizer added is preferably 0.5 to 1% by mass based on the total mass of the raw materials for producing the heat-seal layer, and may be, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, or the like.
The antioxidant is preferably added in an amount of 0.5 to 1% by mass, for example, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% or the like, based on the total mass of the raw materials for producing the heat-seal layer.
Preferably, the polyolefin resin in the raw materials for preparing the composite layer, the core layer and the heat-seal layer is independently selected from any one of linear low density polyethylene, low density polyethylene or metallocene polyethylene or the combination of at least two of the linear low density polyethylene, the low density polyethylene or the metallocene polyethylene.
Preferably, the polyolefin resin is selected from the group consisting of a combination of linear low density polyethylene and low density polyethylene in a mass ratio of (6-9) to (1-4);
wherein "6 to 9" may be, for example, 6, 6.5, 7, 7.5, 8, 8.5, 9, etc.;
here, "1-2" may be, for example, 1, 1.2, 1.4, 1.6, 1.8, 2, etc.
Preferably, the polyolefin resin is selected from the group consisting of metallocene polyethylene and low density polyethylene in a mass ratio of (6-9) to (1-4);
wherein "6 to 9" may be, for example, 6, 6.5, 7, 7.5, 8, 8.5, 9, etc.;
here, "1 to 4" may be, for example, 1, 1.5, 2, 2.5, 3, 3.5, 4, etc.
Preferably, the polyolefin resin has a melt index of 1 to 5g/10min, and may be, for example, 1g/10min, 1.5g/10min, 2g/10min, 2.5g/10min, 3g/10min, 3.5g/10min, 4g/10min, 4.5g/10min, 5g/10min, or the like.
Preferably, the processing aid in the raw materials for the preparation of the composite layer and the heat seal layer is independently selected from PPA aids and/or openers.
Preferably, the opening agent is a silica opening agent.
Preferably, the infrared-reflective pigments in the raw materials for the preparation of the composite, core and heat-seal layers are independently selected from
Figure BDA0002480548040000061
Black、Black 10C909、
Figure BDA0002480548040000062
550 or
Figure BDA0002480548040000063
800, or a combination of at least two thereof. The infrared reflection pigment is a black pigment.
Preferably, the ultraviolet light stabilizers in the raw materials for the preparation of the composite layer, the core layer and the heat-seal layer are independently selected from UV3529 and/or light stabilizer 622.
In a second aspect, the present invention provides a method of making an infrared-reflective polyolefin film according to the first aspect, comprising the steps of:
(1) respectively blending the preparation raw materials of the composite layer, the core layer and the heat sealing layer to respectively obtain composite layer compound particles, core layer compound particles and heat sealing layer compound particles;
(2) and (2) carrying out melting plasticization, extrusion and sizing on the composite layer compound particles, the core layer compound particles and the heat sealing layer compound particles obtained in the step (1) to obtain the infrared reflection polyolefin film.
Preferably, the blending of step (1) is carried out in a twin screw extruder.
Preferably, the blending temperature in step (1) is 150-.
Preferably, the melt plasticization of step (2) is performed using a multilayer coextrusion casting apparatus and/or a film blowing apparatus.
Preferably, the temperature for the melt plasticizing in the step (2) is 170-.
Preferably, the shaping in the step (2) is cooling shaping.
Preferably, step (2) is followed by step (3): and carrying out corona treatment on the infrared reflection polyolefin film, and winding to obtain a finished product.
Preferably, the preparation method comprises the following steps:
(1) respectively mixing the preparation raw materials of the composite layer, the core layer and the heat sealing layer, and then performing blending modification granulation by a double-screw extruder at the temperature of 150-250 ℃ to respectively obtain composite layer compound particles, core layer compound particles and heat sealing layer compound particles;
(2) melting and plasticizing the composite layer compound particles, the core layer compound particles and the heat sealing layer compound particles obtained in the step (1) at the temperature of 170-250 ℃ by using multilayer coextrusion casting equipment and/or film blowing equipment, extruding by using a die head, and cooling and shaping to obtain the infrared reflection polyolefin film;
(3) and (3) carrying out corona treatment on the infrared reflection polyolefin film obtained in the step (2), and winding to obtain a finished product.
In a third aspect, the present invention provides a use of the infrared reflective polyolefin film according to the first aspect for preparing a black back sheet film of a solar cell.
Compared with the prior art, the invention has the following beneficial effects:
the infrared reflection polyolefin film has high reflectivity in an infrared region, the reflectivity of the prepared backboard in a 780-1100nm waveband can reach 40-60%, and the backboard has excellent ultraviolet resistance, wherein the ultraviolet resistance can reach 330kWh/m2Above, and excellent water-blocking performance, the water vapor transmission rate is only 2-5 g/(m)2·24h)。
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The sources of the raw materials of the components in the following examples are as follows: linear low density polyethylene (seiko LL0220AA), low density polyethylene (2420H mesolamella), metallocene polyethylene (M4707EP), PPA adjuvant (7M 1813).
Example 1
The embodiment provides an infrared reflection polyolefin film, which includes a composite layer, a core layer and a heat seal layer, which are sequentially stacked, wherein the thickness of the polyolefin film is 70 μm, the thickness of the composite layer is 20 μm, the thickness of the core layer is 30 μm, the thickness of the heat seal layer is 20 μm, and preparation raw materials of each layer specifically include the following components:
Figure BDA0002480548040000081
the preparation method of the infrared reflection polyolefin film provided by the embodiment comprises the following steps:
(1) respectively putting the preparation raw materials of the composite layer, the core layer and the heat sealing layer into a high-speed mixer for uniform mixing, and then respectively carrying out blending modification granulation at 180 ℃ through a double-screw extruder to obtain composite layer compound particles, core layer compound particles and heat sealing layer compound particles;
(2) melting and plasticizing the composite layer compound particles, the core layer compound particles and the heat sealing layer compound particles obtained in the step (1) in a multilayer coextrusion casting device at 230 ℃, extruding through a die head, and cooling and shaping to obtain the infrared reflection polyolefin film;
(3) and (3) carrying out corona treatment on the infrared reflection polyolefin film obtained in the step (2), and winding to obtain a finished product.
Example 2
The embodiment provides an infrared reflection polyolefin film, which includes a composite layer, a core layer and a heat seal layer, which are sequentially stacked, wherein the thickness of the polyolefin film is 60 μm, the thickness of the composite layer is 15 μm, the thickness of the core layer is 30 μm, the thickness of the heat seal layer is 15 μm, and preparation raw materials of each layer specifically include the following components:
Figure BDA0002480548040000091
Figure BDA0002480548040000101
the preparation method of the infrared reflection polyolefin film provided by the embodiment comprises the following steps:
(1) respectively putting the preparation raw materials of the composite layer, the core layer and the heat sealing layer into a high-speed mixer for uniformly mixing, and then respectively carrying out blending modification granulation at 200 ℃ by a double-screw extruder to obtain composite layer compound particles, core layer compound particles and heat sealing layer compound particles;
(2) melting and plasticizing the composite layer compound particles, the core layer compound particles and the heat sealing layer compound particles obtained in the step (1) in a multilayer coextrusion casting device at 230 ℃, extruding through a die head, and cooling and shaping to obtain the infrared reflection polyolefin film;
(3) and (3) carrying out corona treatment on the infrared reflection polyolefin film obtained in the step (2), and winding to obtain a finished product.
Example 3
The embodiment provides an infrared reflection polyolefin film, which includes a composite layer, a core layer and a heat seal layer, which are sequentially stacked, wherein the thickness of the polyolefin film is 100 μm, the thickness of the composite layer is 25 μm, the thickness of the core layer is 50 μm, the thickness of the heat seal layer is 25 μm, and preparation raw materials of each layer specifically include the following components:
Figure BDA0002480548040000102
the preparation method of the infrared reflection polyolefin film provided by the embodiment comprises the following steps:
(1) respectively putting the preparation raw materials of the composite layer, the core layer and the heat sealing layer into a high-speed mixer for uniform mixing, and then carrying out blending modification granulation by a double-screw extruder at 250 ℃ to obtain composite layer compound particles, core layer compound particles and heat sealing layer compound particles;
(2) melting and plasticizing the composite layer compound particles, the core layer compound particles and the heat sealing layer compound particles obtained in the step (1) in multilayer coextrusion film blowing equipment at 190 ℃, extruding through a die head, and cooling and shaping to obtain the infrared reflection polyolefin film;
(3) and (3) carrying out corona treatment on the infrared reflection polyolefin film obtained in the step (2), and winding to obtain a finished product.
Example 4
This example provides an infrared reflective polyolefin film, which is different from example 1 only in that the thickness of the composite layer is 15 μm, the thickness of the core layer is 40 μm, the thickness of the heat seal layer is 15 μm, and the content of raw materials for preparing each layer and the preparation method are the same as example 1.
Example 5
This example provides an infrared reflective polyolefin film, which is different from example 1 only in that metallocene polyethylene in the raw materials for preparing the composite layer is replaced by linear low density polyethylene, metallocene polyethylene in the raw materials for preparing the heat seal layer is replaced by linear low density polyethylene, and the content of other raw materials for preparing each layer and the preparation method are the same as those in example 1.
Example 6
This example provides an infrared reflective polyolefin film, which is different from example 1 only in that the linear low density polyethylene in the raw material for preparing the core layer is replaced by metallocene polyethylene, and the content of other raw materials for preparing each layer and the preparation method are the same as those of example 1.
Example 7
This example provides an infrared reflective polyolefin film, which is different from example 1 only in that the thickness of the composite layer is 10 μm, the thickness of the core layer is 50 μm, the thickness of the heat seal layer is 10 μm, and the content of raw materials for preparing each layer and the preparation method are the same as example 1.
Example 8
This example provides an infrared reflective polyolefin film, which is different from example 1 only in that the thickness of the composite layer is 20 μm, the thickness of the core layer is 20 μm, the thickness of the heat seal layer is 30 μm, and the content of raw materials for preparing each layer and the preparation method are the same as example 1.
Example 9
This example provides an infrared reflective polyolefin film, which is different from example 1 only in that metallocene polyethylene or linear low density polyethylene is not added to the raw material polyolefin resin for each layer of the infrared reflective polyolefin film, and only low density polyethylene is added, that is, the composite layer contains 93.5% of low density polyethylene, the core layer contains 89.5% of low density polyethylene, the heat seal layer contains 92.5% of low density polyethylene, and the content and preparation method of other raw materials for each layer are the same as those in example 1.
Example 10
This example provides an infrared reflective polyolefin film, which is different from example 1 only in that low density polyethylene or linear low density polyethylene is not added to the raw material polyolefin resin for each layer of the infrared reflective polyolefin film, and only metallocene polyethylene is added, that is, 93.5% of metallocene polyethylene is contained in the composite layer, 89.5% of metallocene polyethylene is contained in the core layer, 92.5% of metallocene polyethylene is contained in the heat seal layer, and the content and preparation method of other raw materials for each layer are the same as those in example 1.
Comparative example 1
This comparative example provides an infrared reflective polyolefin film, which is different from example 1 only in that the core layer does not contain an infrared reflective pigment, the content of the linear low density polyethylene is 70%, and the content of other preparation raw materials of each layer and the preparation method are the same as those of example 1.
Comparative example 2
This comparative example provides an infrared reflective polyolefin film, which differs from example 1 only in that the core layer does not contain an ultraviolet stabilizer, the linear low density polyethylene content is 60.5%, and the contents of other preparation raw materials and preparation methods of the layers are the same as those of example 1.
Comparative example 3
This comparative example provides an infrared reflective polyolefin film, which differs from example 1 only in that the composite layer, core layer and heat seal layer all contain no uv stabilizer, the polyolefin film has a thickness of 70 μm, the composite layer has a thickness of 20 μm, the core layer has a thickness of 30 μm, and the heat seal layer has a thickness of 20 μm, and the raw materials for preparing each layer specifically include the following components:
Figure BDA0002480548040000131
the infrared reflective polyolefin film provided in this comparative example was prepared in the same manner as in example 1.
Comparative example 4
This comparative example provides an infrared-reflective polyolefin film, which differs from example 1 only in that the composite layer, core layer and heat-seal layer all contain no infrared-reflective pigment, the polyolefin film has a thickness of 70 μm, the composite layer has a thickness of 20 μm, the core layer has a thickness of 30 μm, and the heat-seal layer has a thickness of 20 μm, and the respective layers are prepared from specifically the following ingredients:
Figure BDA0002480548040000141
the infrared reflective polyolefin film provided in this comparative example was prepared in the same manner as in example 1.
Test example 1
Back plate performance test
Coating glue on one side of 250-micron-thick PET with the reflectivity of 90%, and compounding 25-micron-thick polyvinyl fluoride (PVF) film; and glue is also coated on the other side, the polyolefin films prepared in the examples 1 to 10 and the polyolefin films prepared in the comparative examples 1 to 4 are compounded, and after curing, the solar cell back sheet is obtained, and the performance of the solar cell back sheet is measured. Wherein, the reflectivity: water vapor transmission rate, measured according to the regulations of IEC 62805-2: detecting according to the specification of GB/T26253, wherein the conditions of the ultraviolet aging test equipment are as follows: the ultraviolet spectral distribution of the ultraviolet test box in the photovoltaic industry standard accords with the related regulation of IEC 61215, and the test temperature is 65 ℃. Specific test results for the backsheet properties are shown in table 1.
TABLE 1
Figure BDA0002480548040000151
As can be seen from the test data in Table 1, the reflectivity of the backboard made of the infrared reflection polyolefin film in the 780-1100nm waveband can reach 40-60%, and the backboard has excellent ultraviolet resistance which can reach 330kWh/m2And excellent water-blocking performance, the water vapor transmission rate is 2-5 g/(m)2·24h)。
From a comparison of example 1 with examples 5 and 6, it is clear that the red according to the inventionWhen the polyolefin resins of the external reflection polyolefin film composite layer, the core layer and the heat sealing layer are compounded by metallocene polyethylene and low-density polyethylene, the water vapor transmission rate of the prepared back plate is obviously reduced, and the water blocking capability is obviously improved. It is seen from the comparison of example 1 with examples 7 and 8 that the layer thickness ratio causes fluctuations in the infrared reflectance and water vapor permeability properties. From a comparison of example 1 with example 9, an infrared reflective polyolefin film prepared using only low density polyethylene produced a backsheet having a water vapor transmission rate of 5.6 g/(m)224h), the water-blocking performance is poor. As can be seen from the comparison between example 1 and example 10, the average reflectivity of the back sheet prepared without low density polyethylene in the 780-1100nm wavelength band can reach 40%, but the infrared reflective pigment is not uniformly dispersed, which results in a poor film appearance, and the measured reflectivity at different points of the infrared reflective polyolefin film is not uniform. As can be seen from the comparison of example 1 with comparative examples 1 and 4, the reflectivity of the prepared back plate at 780-1100nm is obviously reduced in the absence of the infrared reflective pigment. As can be seen from the comparison of example 1 with comparative examples 2 and 3, the lack of the UV stabilizer results in a backsheet having a significantly reduced UV resistance.
The applicant states that the present invention is illustrated by the above examples of the infrared reflective polyolefin film of the present invention and the preparation method and application thereof, but the present invention is not limited to the above examples, i.e. it does not mean that the present invention must be implemented by the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (15)

1. The infrared reflection polyolefin film is characterized by comprising a composite layer, a core layer and a heat sealing layer which are sequentially stacked;
the composite layer comprises the following raw materials in percentage by mass, based on 100% of the total mass of the raw materials for preparing the composite layer: 80-96% of polyolefin resin, 0.1-16% of processing aid, 1-10% of infrared reflection pigment, 0.5-1% of ultraviolet light stabilizer and 0.5-1% of antioxidant;
the core layer is prepared from the following raw materials in percentage by mass of 100 percent: 75-95% of polyolefin resin, 1-20% of infrared reflection pigment, 0.5-5% of ultraviolet light stabilizer and 0.5-1% of antioxidant;
the heat-sealing layer comprises the following raw materials in percentage by mass, based on 100% of the mass of the raw materials for preparing the heat-sealing layer: 60-95% of polyolefin resin, 0.1-35% of processing aid, 1-10% of infrared reflection pigment, 0.5-1% of ultraviolet light stabilizer and 0.5-1% of antioxidant;
the processing aid in the raw materials for preparing the composite layer and the heat sealing layer is independently selected from PPA aid and/or an opening agent;
the infrared reflection pigment in the raw materials for preparing the composite layer, the core layer and the heat sealing layer is independently selected from SIOPAL®Black、Black 10C909、Altiris®550 and Altiris®800, or a combination of at least two thereof;
the thickness of the infrared reflection polyolefin film is 50-150 mu m;
the thickness ratio of the composite layer to the core layer to the heat sealing layer is 1 (2-3) to 1-2;
the polyolefin resin is selected from the combination of metallocene polyethylene and low density polyethylene, and the mass ratio of the metallocene polyethylene to the low density polyethylene is (6-9) to (1-4).
2. The infrared-reflective polyolefin film of claim 1, wherein the thickness ratio of the composite layer, core layer and heat-seal layer is 1 (2-3): 1.
3. The infrared-reflective polyolefin film according to claim 1, wherein the polyolefin resin has a melt index of 1 to 5g/10 min.
4. The infrared-reflective polyolefin film of claim 1 wherein the opening agent is a silica opening agent.
5. The infrared-reflective polyolefin film of claim 1 wherein the ultraviolet light stabilizers in the raw materials for making the composite, core and heat-seal layers are independently selected from the group consisting of UV3529 and/or light stabilizers 622.
6. The infrared-reflective polyolefin film of claim 1, wherein the antioxidants in the raw materials for preparing the composite, core and heat-seal layers comprise antioxidant 1076 and/or antioxidant 168.
7. The method of making an infrared-reflective polyolefin film of any of claims 1-6, comprising the steps of:
(1) blending the preparation raw materials of the composite layer, the core layer and the heat sealing layer respectively to obtain composite layer compound particles, core layer compound particles and heat sealing layer compound particles respectively;
(2) and (2) carrying out melting plasticization, extrusion and sizing on the composite layer compound particles, the core layer compound particles and the heat sealing layer compound particles obtained in the step (1) to obtain the infrared reflection polyolefin film.
8. The method of claim 7, wherein the blending of step (1) is performed in a twin-screw extruder.
9. The method as claimed in claim 7, wherein the blending temperature in step (1) is 150 ℃ to 250 ℃.
10. The production method according to claim 7, wherein the melt plasticization of the step (2) is performed by using a multilayer coextrusion casting apparatus or a film blowing apparatus.
11. The method as claimed in claim 7, wherein the temperature for the melt-plastication in step (2) is 170-250 ℃.
12. The method according to claim 7, wherein the setting in the step (2) is cooling setting.
13. The method according to claim 7, further comprising step (3) after step (2): and carrying out corona treatment on the infrared reflection polyolefin film, and winding to obtain a finished product.
14. The method of manufacturing according to claim 7, comprising the steps of:
(1) respectively mixing the preparation raw materials of the composite layer, the core layer and the heat sealing layer, and then performing blending modification granulation by a double-screw extruder at the temperature of 150-250 ℃ to respectively obtain composite layer compound particles, core layer compound particles and heat sealing layer compound particles;
(2) melting and plasticizing the composite layer compound particles, the core layer compound particles and the heat sealing layer compound particles obtained in the step (1) at the temperature of 250 ℃ by using multilayer coextrusion casting equipment or film blowing equipment, extruding the obtained product through a die head, and cooling and shaping the obtained product to obtain the infrared reflection polyolefin film;
(3) and (3) carrying out corona treatment on the infrared reflection polyolefin film obtained in the step (2), and winding to obtain a finished product.
15. Use of the infrared-reflective polyolefin film of any one of claims 1-6 for the preparation of a solar cell black back sheet film.
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CN104508836A (en) * 2012-04-19 2015-04-08 霍尼韦尔国际公司 Backsheets for photovoltaic modules using infrared reflective pigments
CN105538846A (en) * 2015-12-07 2016-05-04 永新股份（黄山）包装有限公司 PE composite film and preparation method thereof, and solar back panel containing PE composite film

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CN104508836A (en) * 2012-04-19 2015-04-08 霍尼韦尔国际公司 Backsheets for photovoltaic modules using infrared reflective pigments
CN104335362A (en) * 2012-06-07 2015-02-04 东洋铝株式会社 Solar battery rear face protection sheet
CN103642416A (en) * 2013-12-04 2014-03-19 常州回天新材料有限公司 PE (polyethylene) composite film prone to be used for repeat processing of solar backboard
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