阅读说明：本技术 散热太阳能电池背板及其制备方法 (Heat dissipation solar cell backboard and preparation method thereof ) 是由 潘俊 胡玉婷 陆秀洋 刘松瑞 俞明华 居俊杰 崔根香 于 2021-07-19 设计创作，主要内容包括：本发明属于太阳能电池背板技术领域,具体涉及一种散热太阳能电池背板及其制备方法；其中,所述散热太阳能电池背板包括：基材层；以及散热涂层,其涂覆于所述基材层的朝向电池片的表面；其中所述散热涂层中含有桥连结构的氮化硼。本发明通过将桥连结构的氮化硼加入聚丙烯基材料中,以在聚丙烯基材料中形成三维空间的导热网络,散热效果更佳；通过减少导热填料的添加量,从而保证了散热材料的熔体强度,降低了散热材料的加工难度；本发明将桥连结构的氮化硼添加到散热涂层中,以提高散热太阳能电池背板的散热性能。(The invention belongs to the technical field of solar cell back plates, and particularly relates to a heat dissipation solar cell back plate and a preparation method thereof; wherein the heat dissipating solar cell backsheet comprises: a substrate layer; the heat dissipation coating is coated on the surface, facing the battery piece, of the base material layer; wherein the heat dissipation coating contains boron nitride with a bridging structure. According to the invention, boron nitride with a bridging structure is added into the polypropylene-based material, so that a three-dimensional heat-conducting network is formed in the polypropylene-based material, and the heat-radiating effect is better; the addition amount of the heat-conducting filler is reduced, so that the melt strength of the heat-radiating material is ensured, and the processing difficulty of the heat-radiating material is reduced; according to the invention, boron nitride with a bridging structure is added into the heat dissipation coating so as to improve the heat dissipation performance of the heat dissipation solar cell backboard.)

1. A heat dissipating solar cell backsheet, comprising:

a substrate layer; and

the heat dissipation coating is coated on the surface, facing the battery piece, of the base material layer; wherein

The heat dissipation coating contains boron nitride with a bridging structure.

2. The heat dissipating solar cell backsheet of claim 1,

the boron nitride of the bridging structure is formed by connecting flaky boron nitride by taking gold nanoparticles as targets and gold nanorods as bridges.

3. A preparation method of a heat dissipation solar cell backboard is characterized by comprising the following steps:

step S1, magnetic stirring, ultrasonic compounding, washing and drying are carried out on the water solution of boron nitride, gold nano particles and gold nano rods to prepare a pretreated filler composition;

step S2, adding the pretreated filler composition and polypropylene into a mixer, adding an auxiliary agent, and stirring to obtain a raw material composition;

step S3, adding the raw material composition into an extruder, extruding, grinding and sieving to obtain polypropylene-based heat dissipation powder;

step S4, adding the polypropylene-based heat dissipation powder into a solvent to prepare polypropylene-based heat dissipation coating liquid;

and step S5, coating the polypropylene-based heat dissipation coating liquid on one surface, facing the battery piece, of the base material layer to obtain the heat dissipation solar battery back plate.

4. The method according to claim 3,

the gold nanorods, the gold nanoparticles, the boron nitride and the polypropylene are respectively prepared from the following components in parts by weight: 1 part, 1.0-3.0 parts, 1.0-10 parts and 5-80 parts.

5. The method according to claim 3,

the auxiliary agent comprises the following components in parts by mass:

antioxidant: 0.2-0.8 part;

coupling agent: 0.3-1.0 part;

a compatilizer: 0.5-1.5 parts;

lubricant: 0.3 to 1.2 portions.

6. The method according to claim 5,

the antioxidant comprises at least one of antioxidant 1076, antioxidant 2246, antioxidant DLTP and antioxidant 1010.

7. The method according to claim 5,

the coupling agent comprises at least one of coupling agent A-171, NDZ-605, KH-550 and KH-570.

8. The method according to claim 5,

the compatilizer comprises at least one of styrene-maleic anhydride graft copolymer, maleic anhydride graft polypropylene, styrene-methacrylic acid graft copolymer and ionic polymer.

9. The method according to claim 5,

the lubricant comprises at least one of fatty acid anhydride, calcium stearate, fatty alcohol and ethylene bis-stearic acid amide.

Technical Field

The invention belongs to the technical field of solar cell back plates, and particularly relates to a heat dissipation solar cell back plate and a preparation method thereof.

Background

In the face of the difficult problems of exhaustion of fossil energy and environmental pollution caused by the exhaustion of fossil energy, the photovoltaic industry which can convert inexhaustible light energy into electric energy is developed like spring bamboo shoots after rain. And the photovoltaic module needs to resist ultraviolet, high temperature and water vapor in the use process. The back plate plays an especially important role in packaging and protecting the photovoltaic module, and the back plate can protect the photovoltaic module only by having the performances of corrosion resistance, breakdown resistance, weather resistance and the like, so that the service life of the back plate can be as long as 25 years.

Along with the photoelectric conversion of the crystalline silicon solar cell, the temperature in the module can be obviously increased, the power generation efficiency is sharply reduced due to the excessively high temperature, meanwhile, the stability of the packaging material is affected due to the generated high temperature, the aging of the module is accelerated, the service life of the module is difficult to meet, and even the fire hazard is caused. The back plate is generally formed by compounding several polymer materials, and the heat conductivity coefficient of the polymer materials is generally low, so that effective heat dissipation cannot be performed. Therefore, it is particularly important to prepare a back plate with good heat dissipation effect and performances of weather resistance, insulation and the like.

In order to improve the heat dissipation of the backplane material, the following methods are mainly adopted at present:

adopting a full metal back plate (CN200820200742.9, CN 201120084141.8); the defect is that the requirement of the backboard material on long-time insulation can not be well met only by depending on the oxide layer on the surface, so that the assembly faces the safety problem.

Replacing the substrate layer with a metal heat conduction layer made of copper, tin, aluminum and stainless steel (CN 201510371714.8); the disadvantages are that the assembly is too heavy to transport and install, has poor ductility and poor long-term aging capability.

Disclosure of Invention

The invention provides a heat dissipation solar cell back plate and a preparation method thereof.

In order to solve the above technical problem, the present invention provides a heat dissipation solar cell back sheet, including: a substrate layer; the heat dissipation coating is coated on the surface, facing the battery piece, of the base material layer; wherein the heat dissipation coating contains boron nitride with a bridging structure.

In another aspect, the invention further provides a preparation method of the heat dissipation solar cell back plate, which comprises the following steps: step S1, magnetic stirring, ultrasonic compounding, washing and drying are carried out on the water solution of boron nitride, gold nano particles and gold nano rods to prepare a pretreated filler composition; step S2, adding the pretreated filler composition and polypropylene into a mixer, adding an auxiliary agent, and stirring to obtain a raw material composition; step S3, adding the raw material composition into an extruder, extruding, grinding and sieving to obtain polypropylene-based heat dissipation powder; step S4, adding the polypropylene-based heat dissipation powder into a solvent to prepare polypropylene-based heat dissipation coating liquid; and step S5, coating the polypropylene-based heat dissipation coating liquid on one surface of the base material facing the battery piece to obtain the heat dissipation solar battery back plate.

The polypropylene-based material has the beneficial effects that the boron nitride with the bridging structure is added into the polypropylene-based material to form a three-dimensional heat-conducting network in the polypropylene-based material, so that the heat-radiating effect is better; the addition amount of the heat-conducting filler is reduced, so that the melt strength of the heat-radiating material is ensured, and the processing difficulty of the heat-radiating material is reduced; according to the invention, boron nitride with a bridging structure is added into the heat dissipation coating so as to improve the heat dissipation performance of the heat dissipation solar cell backboard.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

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

Fig. 1 is a schematic structural diagram of a heat dissipation solar cell back sheet of the present invention;

FIG. 2 is a schematic structural view of boron nitride in a bridged structure of the present invention;

fig. 3 is an SEM image of boron nitride of a bridged structure of the present invention.

In the figure:

1-polypropylene; 2-gold nanoparticles; 3-gold nanorods; 4-boron nitride; 5-a substrate layer; 6-heat dissipation coating.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The existing polypropylene-based heat dissipation material is mainly prepared by adding two-dimensional flaky heat conduction fillers such as graphene nanosheets and the like, but the polypropylene-based heat dissipation material can only realize heat conduction in the same parallel dimension and cannot realize heat conduction in a three-dimensional space; the addition amount of the heat-conducting filler can reach 40% or more to realize the obvious improvement of the heat-conducting effect, and the excessively high addition amount of the heat-conducting filler can reduce the melt strength of the material and improve the processing difficulty.

In order to reduce the amount of the heat conductive filler and the processing difficulty, as shown in fig. 1, the invention provides a heat dissipation solar cell back plate, which comprises: a base material layer 5; the heat dissipation coating 6 is coated on the surface, facing the battery piece, of the base material layer 5; wherein the heat dissipation coating 6 contains boron nitride with a bridging structure.

Wherein, optionally, the substrate layer 5 may be but not limited to a PET layer.

Specifically, boron nitride with a bridging structure is added into the polypropylene-based material to form a heat-conducting network in a three-dimensional space, so that the heat-radiating effect is better; the addition amount of the heat-conducting filler is reduced, so that the melt strength of the heat-radiating material is ensured, and the processing difficulty of the heat-radiating material is reduced; according to the invention, boron nitride with a bridging structure is added into the heat dissipation coating 6, so that the heat dissipation performance of the heat dissipation solar cell backboard is improved.

When the gold nanorods and the polymer are directly mixed, the gold nanorods are easy to agglomerate; in the invention, after the gold nanorods are linearly arranged, the gold nanoparticles and the flaky boron nitride are added, so that a net structure is formed in the polymer, the heat conduction of a three-dimensional space is realized, and the heat dissipation performance of the polymer is improved.

Optionally, as shown in fig. 2 and fig. 3, the boron nitride of the bridging structure is formed by connecting the flaky boron nitride 4 with the gold nanoparticles 2 as target points and the gold nanorods 3 as bridges.

Specifically, the direction F in fig. 2 is the direction of heat through the boron nitride of the bridging structure. Connecting the flaky boron nitride 4 to form boron nitride with a bridging structure by taking the gold nanorods 3 as a bridge and the gold nanoparticles 2 as targets; boron nitride with a bridging structure is added into the polypropylene 1 matrix as a filler, so that components in the filler are uniformly distributed in the polypropylene 1 matrix, and the components are prevented from being added independently to form agglomeration to form an isolated island.

Further, the invention also provides a preparation method of the heat dissipation solar cell backboard, which comprises the following steps: step S1, magnetic stirring, ultrasonic compounding, washing and drying are carried out on the water solution of boron nitride, gold nano particles and gold nano rods to prepare a pretreated filler composition; step S2, adding the pretreated filler composition and polypropylene into a mixer, adding an auxiliary agent, and stirring to obtain a raw material composition; step S3, adding the raw material composition into an extruder, extruding, grinding and sieving to obtain polypropylene-based heat dissipation powder; step S4, adding the polypropylene-based heat dissipation powder into a solvent to prepare polypropylene-based heat dissipation coating liquid; and step S5, coating the polypropylene-based heat dissipation coating liquid on one surface, facing the battery piece, of the base material layer to obtain the heat dissipation solar battery back plate.

Optionally, the polypropylene-based heat dissipation coating liquid contains 1.5-3.5 wt% of polypropylene-based heat dissipation powder.

Specifically, gold nanorods are magnetically stirred in deionized water, so that the gold nanorods are linearly arranged in the same direction; adding gold nanoparticles into the gold nanorod solution, and continuing to perform magnetic stirring to disperse the gold nanoparticles among the gold nanorods which are linearly arranged to form a network target; adding flaky boron nitride for ultrasonic compounding to insert the flaky boron nitride among the gold nanoparticles in a penetrating way to form boron nitride with a bridging structure, and preparing a pretreated filler composition; adding the pretreated filler composition and polypropylene into a mixer, sequentially adding various auxiliaries, and stirring at the speed of 50-120 r/min for 1-3 h to uniformly mix the raw materials to obtain a raw material composition; and adding the raw material composition into an extruder, extruding, grinding and sieving to obtain the polypropylene-based heat dissipation powder.

Wherein, optionally, the screw section of the extruder is heated at least in four sections, the temperature range is 170-220 ℃, and the temperature of the die head section is 170-200 ℃.

Optionally, the parts by weight of the gold nanorods, the gold nanoparticles, the boron nitride and the polypropylene may be, but are not limited to: 1 part, 1.0-3.0 parts, 1.0-10 parts and 5-80 parts.

Optionally, the auxiliary agent may include, but is not limited to, the following components in parts by mass: antioxidant: 0.2-0.8 part; coupling agent: 0.3-1.0 part; a compatilizer: 0.5-1.5 parts; lubricant: 0.3 to 1.2 portions.

Wherein, optionally, the antioxidant may include, but is not limited to, at least one of antioxidant 1076([ beta-3, 5-di-tert-butyl-4-hydroxyphenylpropionic acid ] octadecyl ester), antioxidant 2246 (4-methyl-6-tert-butylphenol), antioxidant DLTP (dilauryl thiodipropionate), antioxidant 1010 (pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ]).

Alternatively, the coupling agent may include, but is not limited to, at least one of coupling agent A-171 (vinyltrimethoxysilane), NDZ-605 (vinyltriethoxysilane), KH-550 (gamma-aminopropyltriethoxysilane), KH-570 (methacryloxypropyltrimethoxysilane).

Alternatively, the compatibilizer may include, but is not limited to, at least one of styrene-maleic anhydride graft copolymer (PS-g-MAH), maleic anhydride graft polypropylene (PP-g-MAH), styrene-methacrylic acid graft copolymer (PS-g-MAA), and ionomer.

Alternatively, the lubricant may include, but is not limited to, at least one of ethylene bis stearamide.

Example 1

Placing boron nitride in a vacuum drying oven at 60 ℃ for 12 hours, adding 6 parts by mass of boron nitride, 1 part by mass of gold nanorods and 1.5 parts by mass of gold nanoparticles into 85 parts by mass of deionized water, carrying out magnetic stirring for 4 hours and ultrasonic compounding for 4 hours, cooling to room temperature after the completion of the magnetic stirring and ultrasonic compounding, washing with deionized water, filtering and drying to obtain the pretreated filler composition.

Drying polypropylene particles at 60 ℃ for 12h, adding the pretreated filler composition and 68 parts by mass of polypropylene into a mixer, sequentially adding 0.27 part by mass of antioxidant 1076, 0.3 part by mass of KH-570, 0.07 part by mass of PP-g-MAH and 0.3 part by mass of calcium stearate, and stirring at the speed of 60r/min for 2h to prepare a raw material composition; adding the raw material composition into a double-screw extruder for extrusion, wherein the screw section of the extruder is heated at least in four sections, the extrusion temperature is 200 ℃, and the temperature of a die head section is 190 ℃; and cooling, grinding and sieving the extruded material to obtain the polypropylene-based heat dissipation powder.

And coating a polypropylene-based heat dissipation coating prepared from 2.2 wt% of the polypropylene-based heat dissipation powder on one surface, facing the battery piece, of the substrate layer to obtain the heat dissipation solar battery back plate.

Example 2

The preparation method was the same as in example 1, except that the amounts of gold nanorods, gold nanoparticles and boron nitride added were 1 part by mass, 1 part by mass and 5 parts by mass, respectively.

Example 3

The preparation method was the same as in example 1, except that the amounts of gold nanorods, gold nanoparticles and boron nitride added were 1 part by mass, 2 parts by mass and 7 parts by mass, respectively.

Example 4

The preparation method was the same as in example 1, except that the amounts of gold nanorods, gold nanoparticles and boron nitride added were 1 part by mass, 1.5 parts by mass and 10 parts by mass, respectively.

Example 5

The preparation method was the same as in example 1, except that the amounts of gold nanorods, gold nanoparticles and boron nitride added were 1 part by mass, 2 parts by mass and 5 parts by mass, respectively.

Example 6

The preparation method was the same as in example 1, except that the amount of polypropylene added was 21.25 parts by mass, and the subsequent steps were performed after the raw material composition was sufficiently stirred.

Example 7

The preparation method was the same as in example 1, except that the amount of polypropylene added was 42.5 parts by mass, and the subsequent steps were performed after the raw material composition was sufficiently stirred.

Example 8

The preparation method was the same as in example 1, except that the amount of polypropylene added was 85 parts by mass, and the subsequent steps were performed after the raw material composition was sufficiently stirred.

Example 9

The preparation method was the same as in example 1, except that the amount of polypropylene added was 110.5 parts by mass, and the subsequent steps were performed after the raw material composition was sufficiently stirred.

Example 10

The preparation method was the same as in example 1, except that the amount of polypropylene added was 136 parts by mass, and the subsequent steps were performed after the raw material composition was sufficiently stirred.

Example 11

The preparation was as in example 1, except that the antioxidant was 1010.

Example 12

The preparation method was the same as in example 1, except that the amount of the antioxidant 1076 added was 0.46 part by mass.

Example 13

The preparation was carried out as in example 1, except that the coupling agent was KH-550.

Example 14

The preparation method was the same as in example 1, except that the amount of KH-570 added was 0.54 parts by mass.

Example 15

The preparation was as in example 1, except that the compatibilizing agent was PS-g-MAH.

Example 16

The preparation method was as in example 1, except that the amount of PP-g-MAH was 0.54 part by mass.

Example 17

The procedure is as in example 1 except that the lubricant is ethylene bis stearamide.

Example 18

The preparation method was the same as in example 1, except that the amount of calcium stearate added was 0.54 part by mass.

The heat dissipation solar cell back sheets prepared in the above examples 1 to 18 were subjected to related performance tests, and the test results are summarized in table 1.

The test method of the yellowing PCT60 comprises the following steps: the laminated glass plate was placed in a high temperature and high pressure environment of 120 ℃ for 60H, and then the back sheet was tested for yellowing.

Table 1 performance test data of heat dissipation solar cell back panel

As can be seen from the data in table 1, the heat dissipation solar cell back sheet prepared in each example has a high thermal conductivity, and can maintain a high peel strength with respect to the photovoltaic adhesive film.

In conclusion, the boron nitride with the bridging structure is added into the polypropylene-based material, so that the heat-conducting network in a three-dimensional space is realized, and the heat-radiating effect is better; the addition amount of the heat-conducting filler is reduced, so that the melt strength of the heat-radiating material is ensured, and the processing difficulty of the heat-radiating material is reduced; the invention provides a method for improving the heat dissipation performance of a heat dissipation solar cell backboard by adding boron nitride with a bridging structure into a heat dissipation coating 6.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.