CN216473040U

CN216473040U - Back plate film

Info

Publication number: CN216473040U
Application number: CN202123229199.XU
Authority: CN
Inventors: 王磊; 程孝春; 韩晓航; 胡求学; 闫烁; 陈洪野; 吴小平
Original assignee: Cybrid Technologies Inc
Current assignee: Cybrid Technologies Inc
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-05-10
Anticipated expiration: 2031-12-21

Abstract

The utility model discloses a backplate membrane. The utility model discloses a backplate membrane, include from last to the adhesive coating, the polyethylene glycol terephthalate layer that set gradually down, first adhesive coating, first resin layer, second resin layer, third resin layer, the second adhesive coating, the polyethylene glycol terephthalate layer that blocks water, the thickness on polyethylene glycol terephthalate layer is 30-50 mu m. The utility model discloses a backplate membrane does not contain fluorine material, under the thinner condition of PET layer thickness, has good water blocking performance and mechanical strength, has reduced the use amount of PET material and then has reduced the cost of backplate membrane material.

Description

Back plate film

Technical Field

The utility model belongs to the technical field of the backplate membrane, concretely relates to backplate membrane.

Background

The solar cell is prepared by laminating low-iron toughened glass, a silicon wafer, EVA glue and a back plate film. Since the solar cell is directly exposed to air and is easily corroded by water vapor, acid gas, high and low temperature, ultraviolet rays and the like, and the photoelectric conversion performance of the solar cell is attenuated, the protection function of the solar cell back plate film is important. The solar cell back plate film is positioned on the back of the solar cell panel, plays a role in protecting and supporting the cell piece, and has reliable insulativity, water resistance and aging resistance.

The structure of the back plate membrane commonly used is TPT and TPE type, wherein P is PET (polyester), T is the fluoroplastic membrane, E is PE or EVA generally, this kind of back plate is to PET film hydrolysis resistance, uvioresistant and separation requirement higher, present PET film performance is all not ideal in this respect on the market, especially need improve the water blocking performance of PET membrane, secondly this kind of back plate top layer is fluorine-containing material, fluorine-containing material is serious to environmental pollution, and the price is expensive, in addition, along with PET membrane price rises, in order to pursue the cost reduction of back plate, only rely on the raw materials of PET material itself to reduce the price unrealistic, if in order to save PET material, attenuate its thickness, the intensity and the electrical property of membrane also can reduce simultaneously. In order to improve the water-blocking performance of the PET film, a common method in the prior art is to coat a layer of silicon oxide on the PET material, but the prepared film material has poor adhesive performance.

CN103594537A discloses a polyester solar cell back panel film and a preparation method thereof. The polyester solar cell back plate film comprises a middle film layer and an outer surface film layer compounded on the upper surface and the lower surface of the middle film layer; the raw material components of the outer film layer comprise: 15-95 parts of polyethylene terephthalate, 5-90 parts of polyethylene naphthalate and 2-30 parts of functional master batch; the raw material components of the intermediate film layer comprise: 70-98 parts of polyethylene terephthalate and 2-30 parts of functional master batch. The polyester solar cell back plate film obtained by the invention has good weather resistance and hydrolysis resistance, excellent barrier property and long service life; the preparation method is simple, environment-friendly and low in cost. However, the invention still uses more PET materials, and the water blocking performance of the prepared back sheet film needs to be further improved.

Therefore, the market urgently needs an environment-friendly non-fluorine back panel film material with good water-blocking performance and low cost.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model aims to provide a backplate membrane does not contain fluorine material, under the thinner condition of PET layer thickness, has good water blocking performance and mechanical strength, has reduced the use amount of PET material and then has reduced the cost of backplate membrane material.

To achieve the purpose, the utility model adopts the following technical proposal:

a back plate film comprises an adhesive coating, a polyethylene terephthalate layer, a first water-blocking adhesive coating, a first resin layer, a second resin layer, a third resin layer, a second water-blocking adhesive coating and a polyethylene terephthalate layer which are sequentially arranged from top to bottom, wherein the thickness of the polyethylene terephthalate layer is 30-50 mu m.

The utility model discloses a backplate membrane, the first resin layer that sets up between the two-layer polyethylene terephthalate layer, the second resin layer, the third resin layer, the use of pure polyethylene terephthalate has been replaced, when the cost is reduced, the reduction of the water blocking performance and the intensity that leads to because of the attenuate on polyethylene terephthalate layer has been improved, adhesive coating, the first adhesive coating that blocks water, the second blocks water adhesive coating and has guaranteed the good cohesiveness between each layer, the backplate membrane that finally makes has good mechanical properties and the performance of blocking water.

The two layers of the polyethylene terephthalate layer of the present invention are made of the same material, and have a thickness of 30-50 μm, such as 30 μm, 31 μm, 32 μm, 33 μm, 34 μm, 35 μm, 36 μm, 37 μm, 38 μm, 39 μm, 40 μm, 41 μm, 42 μm, 43 μm, 44 μm, 45 μm, 46 μm, 47 μm, 48 μm, 49 μm, or 50 μm.

The adhesive coating is one of a fluorocarbon coating, an acrylic coating, a polyester coating, an acrylic coating, a fluorine modified acrylic coating and a polyester modified acrylic resin coating, has good adhesive performance with an EVA adhesive film or a POE adhesive film, and has a thickness of 1-50 μm, such as 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm.

The first water-blocking adhesive coating is one of a polyvinyl alcohol coating, an ethylene-vinyl alcohol copolymer coating and a polyvinylidene chloride resin coating, so that the good water-blocking performance of the back panel film is realized, and the thickness of the first water-blocking adhesive coating is 1-50 μm, such as 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm.

Wherein the first resin layer is one of PE layer, PP layer, POE layer, EVA layer, EMA layer, silane grafted POE layer, maleic anhydride grafted POE layer and GMA grafted POE layer, the thickness of the first resin layer is 50-300 μm, such as 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm, 270 μm, 280 μm, 290 μm or 300 μm.

Wherein the second resin layer is one of PE layer, POE layer, EVA layer, COC layer or COP layer, and the thickness of the second resin layer is 50-300 μm, such as 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, 210 μm, 220 μm, 230 μm, 240 μm, 250 μm, 260 μm, 270 μm, 280 μm, 290 μm or 300 μm.

Wherein the third resin layer is one of a PE layer, a PP layer, a POE layer, an EVA layer, an EMA layer, a silane grafted POE layer, a maleic anhydride grafted POE layer, and a GMA grafted POE layer, and the thickness of the third resin layer is 50-200 μm, such as 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, or 200 μm.

The second water-blocking adhesive coating is one of a polyvinyl alcohol coating, an ethylene-vinyl alcohol copolymer coating and a polyvinylidene chloride resin coating, so that the good water-blocking performance of the back panel film is realized, and the thickness of the second water-blocking adhesive coating is 1-50 μm, such as 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm.

The back plate film comprises a bonding coating, a polyethylene terephthalate layer, a first water-blocking bonding coating, a first resin layer, a second resin layer, a third resin layer, a second water-blocking bonding coating, a polyethylene terephthalate layer and a UV blocking coating, wherein the bonding coating, the polyethylene terephthalate layer, the first water-blocking bonding coating, the first resin layer, the second resin layer, the third resin layer, the second water-blocking bonding coating, the polyethylene terephthalate layer and the UV blocking coating are sequentially arranged from top to bottom. The UV blocking coating improves the weather resistance of the back plate film material.

The UV blocking coating is one of a polyurethane modified acrylic resin coating, a polyester modified acrylic resin coating, an acrylic resin coating, a silicone modified acrylic resin coating and an unsaturated polyester coating, and the thickness of the UV blocking coating is 1-50 μm, such as 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm.

The utility model discloses a preparation method of backplate membrane does: the first layer of polyethylene glycol terephthalate is sequentially coated with the adhesive coating and the first water-blocking adhesive coating and then wound, and the second layer of polyethylene glycol terephthalate is coated with the second water-blocking adhesive layer and then wound. And co-extruding the first resin layer, the second resin layer and the third resin layer in a co-extrusion extruder for forming, after die head stripping, compounding with two layers of polyethylene terephthalate coated previously at three rollers, or compounding a layer of UV (ultraviolet) blocking coating, and compounding and cooling to obtain the product.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a backplate membrane does not contain fluorine material, under the thinner condition of PET layer thickness, has good water blocking performance and mechanical strength, has reduced the use amount of PET material and then has reduced the cost of backplate membrane material. Specifically, the water vapor permeability is 0.08-0.3g/m2 day, the tensile strength is 65-85MPa, the delta YI after UV300kwh is 1.15-2.45, and the cost can be reduced by 10-20%.

Drawings

Fig. 1 is a schematic structural view of a backsheet film according to example 1 of the present invention;

fig. 2 is a schematic structural view of a back sheet film according to example 6 of the present invention;

wherein the reference numbers are as follows:

1-bond coat; a 2-polyethylene terephthalate layer; 3-a first water-blocking adhesive coating; 4-a first resin layer; 5-a second resin layer; 6-a third resin layer; 7-a second water-blocking adhesive coating; a layer of 8-polyethylene terephthalate; 9-UV blocking coating.

Detailed Description

The technical solution of the present invention is further explained by the specific embodiments in conjunction with fig. 1-2.

The utility model discloses a backplate membrane, include from last to the adhesive coating, the polyethylene glycol terephthalate layer that set gradually down, first adhesive coating, first resin layer, second resin layer, third resin layer, the second adhesive coating that blocks water, the polyethylene glycol terephthalate layer that blocks water, the thickness on polyethylene glycol terephthalate layer is 30-50 mu m.

Example 1

The back sheet film of the embodiment includes, from top to bottom, an adhesive coating 1, a polyethylene terephthalate layer 2, a first water-blocking adhesive coating 3, a first resin layer 4, a second resin layer 5, a third resin layer 6, a second water-blocking adhesive coating 7, and a polyethylene terephthalate layer 8, which are sequentially disposed, and a schematic structural diagram of the back sheet film is shown in fig. 1.

Specifically, the bonding coating 1 is a polyester coating with the thickness of 4 μm; the thickness of the polyethylene terephthalate layer 2 was 30 μm; the first water-resistant adhesive coating 3 is an ethylene-vinyl alcohol copolymer coating with the thickness of 10 mu m; the first resin layer 4 is an EVA layer with the thickness of 50 μm; the second resin layer 5 is a PP layer with the thickness of 100 mu m; the third resin layer 6 is an EMA layer with a thickness of 50 μm; the second water-blocking adhesive coating 7 is a polyvinyl alcohol coating with the thickness of 10 mu m; the thickness of the polyethylene terephthalate layer 8 was 30 μm.

The preparation method of the back sheet film of this example is as follows:

the first layer of polyethylene glycol terephthalate is sequentially coated with the adhesive coating and the first water-blocking adhesive coating and then wound, and the second layer of polyethylene glycol terephthalate is coated with the second water-blocking adhesive layer and then wound. And co-extruding the first resin layer, the second resin layer and the third resin layer in a co-extrusion extruder for forming, after die head stripping, compounding with the two layers of polyethylene terephthalate coated previously at the three rollers, and performing compounding cooling to obtain the product.

Example 2

The back sheet film of the embodiment comprises an adhesive coating 1, a polyethylene terephthalate layer 2, a first water-blocking adhesive coating 3, a first resin layer 4, a second resin layer 5, a third resin layer 6, a second water-blocking adhesive coating 7 and a polyethylene terephthalate layer 8 which are sequentially arranged from top to bottom.

Specifically, the bonding coating 1 is an acrylic coating with the thickness of 4 μm; the thickness of the polyethylene terephthalate layer 2 was 30 μm; the first water-blocking adhesive coating 3 is a polyvinyl alcohol coating with the thickness of 10 mu m; the first resin layer 4 is an EVA layer with the thickness of 50 μm; the second resin layer 5 is a PP layer with the thickness of 200 mu m; the third resin layer 6 is an EMA layer with a thickness of 50 μm; the second water-blocking adhesive coating 7 is a polyvinyl alcohol coating with the thickness of 10 mu m; the thickness of the polyethylene terephthalate layer 8 was 30 μm.

Example 3

Specifically, the bonding coating 1 is a fluorocarbon coating with the thickness of 4 μm; the thickness of the polyethylene terephthalate layer 2 was 50 μm; the first water-blocking adhesive coating 3 is polyvinyl alcohol and has the thickness of 10 mu m; the first resin layer 4 is an EVA layer with the thickness of 50 μm; the second resin layer 5 is a PP layer with the thickness of 200 mu m; the third resin layer 6 is an EMA layer with a thickness of 50 μm; the second water-blocking adhesive coating 7 is a polyvinyl alcohol layer with the thickness of 10 mu m; the thickness of the polyethylene terephthalate layer 8 was 50 μm.

Example 4

Specifically, the bonding coating 1 is a fluorine modified acrylic coating with the thickness of 4 μm; a polyethylene terephthalate layer 2 having a thickness of 50 μm; the first water-blocking adhesive coating 3 is a polyvinyl alcohol layer with the thickness of 10 mu m; the first resin layer 4 is an EVA layer with the thickness of 50 μm; the second resin layer 5 is a PP layer with the thickness of 200 mu m; the third resin layer 6 is an EMA layer with a thickness of 50 μm; the second water-blocking adhesive coating 7 is a polyvinyl alcohol coating with the thickness of 10 mu m; the thickness of the polyethylene terephthalate layer 8 was 50 μm.

Example 5

Specifically, the bonding coating 1 is fluorine modified acrylic acid, and the thickness is 4 μm; a polyethylene terephthalate layer 2 having a thickness of 50 μm; the first water-blocking adhesive coating 3 is a polyvinyl alcohol coating with the thickness of 10 mu m; the first resin layer 4 is an EVA layer with the thickness of 50 μm; the second resin layer 5 is a COC layer with the thickness of 100 mu m; the third resin layer 6 is an EMA layer with a thickness of 50 μm; the second water-blocking adhesive coating 7 is a polyvinyl alcohol coating with the thickness of 10 mu m; the polyethylene terephthalate layer 8 had a thickness of 50 μm.

Example 6

The back sheet film of the embodiment includes, from top to bottom, an adhesive coating 1, a polyethylene terephthalate layer 2, a first water-blocking adhesive coating 3, a first resin layer 4, a second resin layer 5, a third resin layer 6, a second water-blocking adhesive coating 7, a polyethylene terephthalate layer 8, and a UV blocking coating 9, and the structural schematic diagram of the back sheet film is shown in fig. 2.

Specifically, the bonding coating 1 is an acrylic coating with the thickness of 4 μm; the polyethylene terephthalate layer 2 is 30 μm thick; the first water-resistant adhesive coating 3 is an ethylene-vinyl alcohol copolymer coating with the thickness of 10 mu m; the first resin layer 4 is an EVA layer with the thickness of 50 μm; the second resin layer 5 is a PP layer with the thickness of 100 mu m; the third resin layer 6 is an EMA layer with a thickness of 50 μm; the second water-resistant adhesive coating 7 is an ethylene-vinyl alcohol copolymer coating with the thickness of 10 mu m; the thickness of the polyethylene terephthalate layer 8 is 50 μm; the UV blocking coating 9 is a polyurethane modified acrylic resin coating with a thickness of 4 μm.

Comparative example 1

This comparative example is different from example 1 in that it does not contain the first water-blocking adhesive coating 3, the first resin layer 4, the second resin layer 5, the third resin layer 6, the second water-blocking adhesive coating 7, i.e., it comprises an adhesive coating and a polyethylene terephthalate layer arranged in this order from top to bottom, the thickness of the polyethylene terephthalate layer is 280 μm, and the type and thickness of the adhesive coating are the same as those of example 1.

Comparative example 2

This comparative example differs from example 1 in that the first water-blocking adhesive coating and the second water-blocking adhesive coating are both replaced with adhesive coating 1, and are otherwise the same as example 1.

Comparative example 3

This comparative example is different from example 1 in that it comprises a bond coat layer and a polyethylene terephthalate layer in this order from top to bottom, the thickness of the polyethylene terephthalate layer is 200 μm, and the type and thickness of the bond coat layer are the same as those of example 1.

The backsheet films obtained in examples 1 to 6 and comparative examples 1 to 3 were subjected to performance tests, and the results of the tests are shown in table 1.

The test standard of the water vapor transmittance is carried out according to GB/T26253-2010, the test of the tensile strength is carried out according to the ASTM D-882 standard, and the test of the yellowing index after the weather resistance UV300kwh is carried out according to ASTM E313.

TABLE 1

As can be seen from table 1, the utility model discloses a backplate membrane does not contain fluorine material, under the thinner condition of PET layer thickness, has excellent water blocking performance and good mechanical strength, has reduced the use amount of PET material and then has reduced the cost of backplate membrane material. Specifically, the water vapor permeability is 0.08-0.3g/m2 day, the tensile strength is 65-85MPa, the delta YI after UV300kwh is 1.15-2.45, and the cost can be reduced by 10-20%.

Example 6 the backsheet films of examples 1-5 have improved weatherability.

Comparative example 1 did not contain the first water-blocking adhesive coating, the first resin layer, the second resin layer, the third resin layer, the second water-blocking adhesive coating, and the water permeation of the backsheet film was poor.

Comparative example 2 the first water-blocking adhesive coating and the second water-blocking adhesive coating were replaced with adhesive coatings, and the water vapor transmission rate was increased, indicating that the water-blocking coating promoted the water-blocking performance of the entire backsheet.

Comparative example 3 PET was thinned so that the water permeability was increased and the tensile strength was greatly reduced.

The present invention is described in detail by the above embodiments, but the present invention is not limited to the above detailed process equipment and process flow, i.e. not meaning the present invention must rely on the above detailed process equipment and process flow to implement. It should be clear to those skilled in the art that any improvement of the present invention, to the equivalent replacement of each raw material of the present invention, the addition of auxiliary components, the selection of specific modes, etc., all fall within the protection scope and disclosure scope of the present invention.

The above detailed description describes the preferred embodiments of the present invention, but the present invention is not limited to the details of the above embodiments, and the technical idea of the present invention can be within the scope of the present invention, and can be right to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and in order to avoid unnecessary repetition, the present invention does not need to describe any combination of the features.

In addition, various embodiments of the present invention can be combined arbitrarily, and the disclosed content should be regarded as the present invention as long as it does not violate the idea of the present invention.

Claims

1. The back plate film is characterized by comprising a bonding coating, a polyethylene terephthalate layer, a first water-blocking bonding coating, a first resin layer, a second resin layer, a third resin layer, a second water-blocking bonding coating and a polyethylene terephthalate layer which are sequentially arranged from top to bottom, wherein the thickness of the polyethylene terephthalate layer is 30-50 mu m.

2. The backsheet film of claim 1, wherein the tie coat is one of a fluorocarbon coating, an acrylic coating, a polyester coating, an acrylic coating, a fluorine modified acrylic coating, and a polyester modified acrylic resin coating, and the tie coat has a thickness of 1 to 50 μm.

3. The backsheet film of claim 1, wherein the first water-blocking adhesive coating is one of a polyvinyl alcohol coating, an ethylene-vinyl alcohol copolymer coating, and a polyvinylidene chloride resin coating, and has a thickness of 1 to 50 μm.

4. The backsheet film according to claim 1, wherein the first resin layer is one of a PE layer, a PP layer, a POE layer, an EVA layer, an EMA layer, a silane-grafted POE layer, a maleic anhydride-grafted POE layer, and a GMA-grafted POE layer, and the thickness of the first resin layer is 50 to 200 μm.

5. The backsheet film of claim 1, wherein the second resin layer is one of a PE layer, a PP layer, a POE layer, an EVA layer, a COC layer, or a COP layer, and the thickness of the second resin layer is 50 to 300 μm.

6. The backsheet film of claim 1, wherein the third resin layer is one of a PE layer, a PP layer, a POE layer, an EVA layer, an EMA layer, a silane-grafted POE layer, a maleic anhydride-grafted POE layer, and a GMA-grafted POE layer, and the thickness of the third resin layer is 50 to 200 μm.

7. The backsheet film of claim 1, wherein the second water-blocking adhesive coating is one of a polyvinyl alcohol coating, an ethylene-vinyl alcohol copolymer coating, and a polyvinylidene chloride resin coating, and has a thickness of 1 to 50 μm.

8. The backsheet film of claim 1, further comprising a UV-blocking coating, wherein the backsheet film comprises, in order from top to bottom, a tie coat, a polyethylene terephthalate layer, a first water-blocking tie coat, a first resin layer, a second resin layer, a third resin layer, a second water-blocking tie coat, a polyethylene terephthalate layer, and a UV-blocking coating.

9. The backsheet film of claim 8, wherein the UV-blocking coating is one of a polyurethane-modified acrylic coating, a polyester-modified acrylic coating, an acrylic coating, a silicone-modified acrylic coating, and an unsaturated polyester coating, and has a thickness of 1 to 50 μm.