CN110176509B - Stainless steel substrate for flexible solar cell - Google Patents
Stainless steel substrate for flexible solar cell Download PDFInfo
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- CN110176509B CN110176509B CN201910508945.7A CN201910508945A CN110176509B CN 110176509 B CN110176509 B CN 110176509B CN 201910508945 A CN201910508945 A CN 201910508945A CN 110176509 B CN110176509 B CN 110176509B
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 67
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 67
- 239000000758 substrate Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 230000001070 adhesive effect Effects 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims description 52
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- 239000011888 foil Substances 0.000 claims description 33
- 239000002245 particle Substances 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 26
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 22
- 229910052700 potassium Inorganic materials 0.000 claims description 22
- 239000011591 potassium Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 20
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 18
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 18
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 18
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 18
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 18
- 239000012790 adhesive layer Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 16
- 238000001291 vacuum drying Methods 0.000 claims description 16
- 229920002379 silicone rubber Polymers 0.000 claims description 14
- 239000004945 silicone rubber Substances 0.000 claims description 14
- WZJUBBHODHNQPW-UHFFFAOYSA-N 2,4,6,8-tetramethyl-1,3,5,7,2$l^{3},4$l^{3},6$l^{3},8$l^{3}-tetraoxatetrasilocane Chemical compound C[Si]1O[Si](C)O[Si](C)O[Si](C)O1 WZJUBBHODHNQPW-UHFFFAOYSA-N 0.000 claims description 13
- STMDPCBYJCIZOD-UHFFFAOYSA-N 2-(2,4-dinitroanilino)-4-methylpentanoic acid Chemical compound CC(C)CC(C(O)=O)NC1=CC=C([N+]([O-])=O)C=C1[N+]([O-])=O STMDPCBYJCIZOD-UHFFFAOYSA-N 0.000 claims description 13
- HIHIPCDUFKZOSL-UHFFFAOYSA-N ethenyl(methyl)silicon Chemical compound C[Si]C=C HIHIPCDUFKZOSL-UHFFFAOYSA-N 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 13
- 229920001971 elastomer Polymers 0.000 claims description 10
- JZCCFEFSEZPSOG-UHFFFAOYSA-L copper(II) sulfate pentahydrate Chemical compound O.O.O.O.O.[Cu+2].[O-]S([O-])(=O)=O JZCCFEFSEZPSOG-UHFFFAOYSA-L 0.000 claims description 9
- 239000010410 layer Substances 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 239000003377 acid catalyst Substances 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000011541 reaction mixture Substances 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 3
- 239000007795 chemical reaction product Substances 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 239000007822 coupling agent Substances 0.000 claims description 3
- 239000002270 dispersing agent Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000006722 reduction reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000010409 thin film Substances 0.000 abstract description 9
- 239000010408 film Substances 0.000 abstract description 8
- 239000007864 aqueous solution Substances 0.000 description 9
- 239000008367 deionised water Substances 0.000 description 9
- 229910021641 deionized water Inorganic materials 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000000047 product Substances 0.000 description 6
- 238000004448 titration Methods 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000003760 magnetic stirring Methods 0.000 description 3
- 239000012046 mixed solvent Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 229910000366 copper(II) sulfate Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- RWLKLQMGXYQEOQ-UHFFFAOYSA-N N1C(CCC1)=O.[Cu] Chemical compound N1C(CCC1)=O.[Cu] RWLKLQMGXYQEOQ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000307 polymer substrate Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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Abstract
The invention relates to the technical field of preparation of flexible substrates for thin-film solar cells, and discloses a stainless steel substrate for a flexible solar cell. The invention solves the technical problem that the adhesive property between the stainless steel substrate for the flexible solar cell and the flexible film of the solar cell is not good enough so that the stainless steel substrate can not effectively meet the use requirement.
Description
Technical Field
The invention relates to the technical field of preparation of flexible substrates for thin-film solar cells, in particular to a stainless steel substrate for a flexible solar cell.
Background
The thin film solar cell belongs to a new generation solar cell and can be divided into a hard substrate and a flexible substrate according to the types of the substrates. In the past, flexible thin-film solar cells mainly use polymer PET and PEN as conductive substrates, but researches show that the preparation and the use of the cells are limited by the problems of low melting point, easy aging and the like of the polymer substrates. Therefore, the search for a suitable flexible material as a substrate for a solar cell has become an important issue in the research and development of flexible solar cell applications.
Among many materials, stainless steel is the preferred material for replacing PET and PEN as the flexible substrate of the thin-film solar cell in view of its advantages of high temperature resistance, corrosion resistance, excellent conductivity, good ductility, low cost, etc. However, the surface of stainless steel has relatively low roughness and is in a relatively smooth state, so that the adhesion between the stainless steel and a flexible film of a solar cell is not good enough, and the stainless steel cannot effectively meet the use requirement.
Researches find that the improvement of the surface roughness of the substrate is beneficial to improving the adhesion performance between the film and the substrate, while the rolling of the stainless steel substrate for the thin film solar cell is a complex forming process, and the requirements on the surface appearance (including surface roughness and surface texture) of the substrate are higher while strict requirements on the flatness of the substrate are met.
Therefore, how to effectively improve the adhesive property between the stainless steel substrate for the thin film solar cell and the flexible thin film of the solar cell is a problem which needs to be solved urgently at present.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a stainless steel substrate for a flexible solar cell, which solves the technical problem that the existing stainless steel substrate for the flexible solar cell has poor bonding property with a flexible film of the solar cell, so that the existing stainless steel substrate cannot effectively meet the use requirement.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme:
a stainless steel substrate for a flexible solar cell comprises a stainless steel foil, wherein a Cu-based elastic adhesion layer is compounded at the central part of one side surface of the stainless steel foil, and one side surface of the Cu-based elastic adhesion layer and one side surface of the stainless steel foil are in elastic connection in an integrated mode;
the preparation method of the stainless steel substrate comprises the following steps:
copper sulfate pentahydrate is used as a raw material, potassium borohydride is used as a reducing agent, copper polyvinylpyrrolidone is used as a dispersing agent, a liquid phase reduction reaction is carried out under a strong alkali condition to prepare nano Cu particles, the nano Cu particles are firstly mixed with raw methyl vinyl silicone rubber to form a uniform mixed system, then the mixed system is reacted with raw material tetramethylcyclotetrasiloxane, coupling agent allyl glycidyl ether, catalyst chloroplatinic acid and adhesive polymethyl methacrylate under the protection of nitrogen, the reaction product is decompressed and distilled to prepare viscous liquid, the viscous liquid is uniformly coated on the central part of one side surface of a stainless steel foil, and then drying and curing treatment are carried out under a vacuum condition to prepare a Cu-based elastic adhesive layer adhered to the surface of the stainless steel foil, so that the stainless steel substrate is prepared.
Preferably, the Cu-based elastic adhesive layer comprises the following raw materials in parts by weight: 13 parts of potassium borohydride, 0.1 part of sodium hydroxide, 12.5-25 parts of copper sulfate pentahydrate, 0.5-1.5 parts of polyvinylpyrrolidone, 25-40 parts of methyl vinyl silicone rubber crude rubber, 20-35 parts of tetramethylcyclotetrasiloxane, 10-20 parts of allyl glycidyl ether, 0.5 part of chloroplatinic acid and 5-10 parts of polymethyl methacrylate.
Preferably, the Cu-based elastic adhesive layer comprises the following raw materials in parts by weight: 13 parts of potassium borohydride, 0.1 part of sodium hydroxide, 18 parts of copper sulfate pentahydrate, 1 part of copper polyvinylpyrrolidone, 30 parts of raw rubber of methyl vinyl silicone rubber, 30 parts of tetramethylcyclotetrasiloxane, 15 parts of allyl glycidyl ether, 0.5 part of chloroplatinic acid catalyst and 8 parts of polymethyl methacrylate.
Preferably, the preparation method of the stainless steel substrate comprises the following steps:
the method comprises the following steps: mainly taking 13 parts of potassium borohydride, 0.1 part of sodium hydroxide, 12.5-25 parts of copper sulfate pentahydrate and 0.5-1.5 parts of copper polyvinylpyrrolidone as raw materials to prepare Cu particles with the average particle size of 50-100 nm;
step two: firstly, uniformly mixing 25-40 parts of methyl vinyl silicone rubber raw rubber and the prepared Cu particles in a torque rheometer, then carrying out heat treatment at 130-170 ℃ for 20-60 min, and cooling to room temperature to prepare a uniform mixed system;
step three: adding the prepared mixed system into a reactor provided with a stirring device, a heating device and a nitrogen protection device, introducing nitrogen for protection, sequentially adding 20-35 parts of tetramethylcyclotetrasiloxane, 10-20 parts of allyl glycidyl ether, 0.5 part of chloroplatinic acid catalyst and 5-10 parts of polymethyl methacrylate into the reactor at a stirring speed of 120-180 rpm, and stirring at 200-300 rpm;
then, reacting for 0.5h at the temperature of 20 ℃, heating to 50-70 ℃ at the speed of 2 ℃/min, reacting for 1-2 h, heating to 80-120 ℃ at the speed of 2 ℃/min, reacting for 1-3 h, and distilling the reaction mixture under reduced pressure at the temperature of 130-150 ℃ and the pressure of 4kPa until no low-boiling-point substance is evaporated out to prepare viscous liquid;
step four: uniformly coating the prepared viscous liquid on the central part of one side surface of a stainless steel foil with the thickness of 0.3mm, the width of 100mm and the length of 100mm, putting the stainless steel foil into a vacuum drying oven, and carrying out vacuum drying for 1-3 h at the temperature of 60-80 ℃ under the vacuum degree of 133Pa to prepare a Cu-based elastic adhesive layer adhered to the surface of the stainless steel foil, thereby preparing the stainless steel substrate.
(III) advantageous technical effects
Compared with the prior art, the invention has the following beneficial technical effects:
the invention uses blue vitriol (CuSO)4·5H2O) as raw material and potassium borohydride (KBH)4) As reducing agent, polyvinyl pyrrolidone copper (PVP) as dispersant, in strong alkali stripUnder the workpiece, carrying out liquid phase reduction reaction to prepare nano Cu particles, mixing the nano Cu particles with raw methyl vinyl silicone rubber to obtain a uniform mixed system, reacting with raw materials of tetramethylcyclotetrasiloxane, coupling agent allyl glycidyl ether, catalyst chloroplatinic acid and adhesive polymethyl methacrylate (PMMA) under the protection of nitrogen, carrying out reduced pressure distillation on a reaction product to prepare viscous liquid, uniformly coating the viscous liquid on the central part of one side surface of a stainless steel foil with the thickness of 0.3mm, the width of 100mm and the length of 100mm, and then carrying out drying and curing treatment under the vacuum condition to prepare a Cu-based elastic adhesive layer adhered to the surface of the stainless steel foil, thereby preparing the stainless steel substrate;
the volume resistivity of the Cu-based elastic adhesion layer on the stainless steel substrate prepared by the invention is 1.32-1.46 omega-cm, the peeling strength between the Cu-based elastic adhesion layer and the stainless steel foil is 147-154N/cm, the peeling strength between the Cu-based elastic adhesion layer and the flexible thin film (PI) is 136-139N/cm, and the rebound rate is 82-85%;
therefore, the stainless steel substrate prepared by the invention not only has excellent conductivity, but also has ideal bonding performance with a flexible film of a solar cell, and can effectively meet the use requirement of the flexible substrate of the solar cell.
Drawings
Fig. 1 is a front view of a stainless steel substrate for a flexible solar cell according to the present invention;
fig. 2 is a top view of a stainless steel substrate for a flexible solar cell according to the present invention.
The following are marked in the figure: 1-stainless steel foil, 2-Cu based elastic adhesive layer.
Detailed Description
The raw materials used in the following examples are as follows:
specification of stainless steel foil: the thickness is 0.3mm, the width is 100mm, and the length is 100 mm;
cupric sulfate pentahydrate (CuSO)4·5H2O), analytically pure, shanghai chemical reagents ltd;
copper polyvinylpyrrolidone (PVP), trade mark K30, nanjing ruize fine chemicals ltd;
potassium borohydride (KBH)4) Analytically pure, a fertile soil chemical company, Anhui province;
sodium hydroxide (NaOH), analytical grade, tianjin komi reagent ltd;
absolute ethyl alcohol (C)2H5OH), analytically pure, ansite biochemistry ltd, anhui;
raw methyl vinyl silicone rubber, 110 series raw rubber, jiahaixin silicone rubber ltd, shenzhen, city;
tetramethylcyclotetrasiloxane, industrial grade, shanghai silicalite, inc;
allyl glycidyl ether, technical grade, carlin chemical new materials ltd, qu fu city;
chloroplatinic acid, analytical grade, Shenyang nonferrous metals research institute;
polymethyl methacrylate (PMMA), technical grade, Chanshajiazhen Biotech limited;
a stainless steel substrate, see fig. 1 and fig. 2, comprising a stainless steel foil 1 with a thickness of 0.3mm, a width of 100mm and a length of 100mm, wherein a Cu-based elastic adhesive layer 2 is compounded at the central part of one side surface of the stainless steel foil 1, and one side surface of the Cu-based elastic adhesive layer 2 and one side surface of the stainless steel foil 1 are arranged in an integrally formed elastic connection manner;
the preparation method of the Cu-based elastic adhesive layer 2 comprises the following steps:
the first embodiment is as follows:
(1) preparing Cu particles with the average particle size of 50-100 nm:
a. first, 13g of potassium borohydride (KBH)4) Dissolving in 250mL of deionized water, adding 0.1g of sodium hydroxide particles into the potassium borohydride aqueous solution, adjusting the pH value to 12, and preparing to obtain an alkaline potassium borohydride aqueous solution;
b. firstly, a mixed solvent composed of 300mL of deionized water and 200mL of absolute ethyl alcohol is added into a reactor provided with a titration device and a magnetic stirring device, and 12.5g of blue vitriod (CuSO) is firstly added under the stirring speed of 120rpm4·5H2O) is added into a reactor, and then,then 0.5g of polyvinylpyrrolidone (PVP) is added into the reactor, and then the stirring is carried out for 30min at 300 rpm;
c. dropwise adding the prepared alkaline potassium borohydride aqueous solution into a reactor at a titration rate of 0.5mL/s under a stirring rate of 120rpm, and stirring for 10min at 200rpm after dropwise adding;
d. then, filtering, washing the generated product for 3 times by using deionized water, after washing, putting the product into a vacuum drying oven, and carrying out vacuum drying for 6 hours at the temperature of 60 ℃ and the vacuum degree of 133Pa to obtain Cu particles with the average particle size of 50-100 nm;
(2) firstly, uniformly mixing 25g of methyl vinyl silicone rubber raw rubber and the prepared Cu particles in a torque rheometer, then carrying out heat treatment at the temperature of 130 ℃ for 20min, and cooling to room temperature to prepare a uniform mixed system;
(3) adding the prepared mixed system into a reactor provided with a stirring device, a heating device and a nitrogen protection device, introducing nitrogen for protection, sequentially adding 20g of tetramethylcyclotetrasiloxane, 10g of allyl glycidyl ether, 0.5g of chloroplatinic acid catalyst and 5g of polymethyl methacrylate (PMMA) into the reactor at a stirring speed of 120rpm, and stirring at 200 rpm;
then, reacting for 0.5h at the temperature of 20 ℃, heating to 50 ℃ at the speed of 2 ℃/min, reacting for 1h, heating to 80 ℃ at the speed of 2 ℃/min, reacting for 1h, and distilling the reaction mixture at the temperature of 130 ℃ and under the pressure of 4kPa under reduced pressure until no low-boiling-point substances are evaporated out to prepare viscous liquid;
(4) uniformly coating the prepared viscous liquid on the central part of one side surface of a stainless steel foil 1 with the thickness of 0.3mm, the width of 100mm and the length of 100mm, putting the stainless steel foil 1 into a vacuum drying oven, and carrying out vacuum drying for 1h at the temperature of 60 ℃ under the vacuum degree of 133Pa to prepare a Cu-based elastic adhesive layer 2;
(5) the Cu-based elastic adhesive layer 2 prepared as described above was subjected to a performance test, and had a volume resistivity of 1.32. omega. cm, a peel strength with a stainless steel foil of 147N/cm, a peel strength with a flexible film (PI) of 136N/cm, and a spring back of 82%.
Example two:
(1) preparing Cu particles with the average particle size of 50-100 nm:
a. first, 13g of potassium borohydride (KBH)4) Dissolving in 250mL of deionized water, adding 0.1g of sodium hydroxide particles into the potassium borohydride aqueous solution, adjusting the pH value to 12, and preparing to obtain an alkaline potassium borohydride aqueous solution;
b. firstly, a mixed solvent composed of 300mL of deionized water and 200mL of absolute ethyl alcohol is added into a reactor provided with a titration device and a magnetic stirring device, and 18g of blue vitriod (CuSO) is firstly added under the stirring speed of 150rpm4·5H2O) is added into the reactor, 1g of polyvinylpyrrolidone (PVP) is added into the reactor, and then the stirring is carried out for 50min at 400 rpm;
c. dropwise adding the prepared alkaline potassium borohydride aqueous solution into a reactor at a titration rate of 0.5mL/s under a stirring rate of 160rpm, and stirring for 10min at 250rpm after dropwise adding;
d. then, filtering, washing the generated product for 5 times by using deionized water, after washing, putting the product into a vacuum drying oven, and carrying out vacuum drying for 7 hours at the temperature of 75 ℃ and the vacuum degree of 133Pa to obtain Cu particles with the average particle size of 50-100 nm;
(2) mixing 30g of methyl vinyl silicone rubber raw rubber and the prepared Cu particles uniformly in a torque rheometer, performing heat treatment at 150 ℃ for 40min, and cooling to room temperature to prepare a uniform mixed system;
(3) adding the prepared mixed system into a reactor provided with a stirring device, a heating device and a nitrogen protection device, introducing nitrogen for protection, sequentially adding 30g of tetramethylcyclotetrasiloxane, 15g of allyl glycidyl ether, 0.5g of chloroplatinic acid catalyst and 8g of polymethyl methacrylate (PMMA) into the reactor at a stirring speed of 150rpm, and stirring at 250 rpm;
then, reacting for 0.5h at the temperature of 20 ℃, heating to 60 ℃ at the speed of 2 ℃/min, reacting for 1.5h, heating to 100 ℃ at the speed of 2 ℃/min, reacting for 1-3 h, and distilling the reaction mixture at the temperature of 140 ℃ and under the pressure of 4kPa under reduced pressure until no low-boiling-point substances are evaporated out to prepare viscous liquid;
(4) uniformly coating the prepared viscous liquid on the central part of one side surface of a stainless steel foil 1 with the thickness of 0.3mm, the width of 100mm and the length of 100mm, putting the stainless steel foil 1 into a vacuum drying oven, and carrying out vacuum drying for 2h at the temperature of 70 ℃ under the vacuum degree of 133Pa to prepare a Cu-based elastic adhesive layer 2;
(5) the Cu-based elastic adhesive layer 2 prepared as described above was subjected to a performance test, and had a volume resistivity of 1.38. omega. cm, a peel strength with a stainless steel foil of 154N/cm, a peel strength with a flexible film (PI) of 139N/cm, and a spring back of 83%.
Example three:
(1) preparing Cu particles with the average particle size of 50-100 nm:
a. first, 13g of potassium borohydride (KBH)4) Dissolving in 250mL of deionized water, adding 0.1g of sodium hydroxide particles into the potassium borohydride aqueous solution, adjusting the pH value to 12, and preparing to obtain an alkaline potassium borohydride aqueous solution;
b. firstly, a mixed solvent composed of 300mL of deionized water and 200mL of absolute ethyl alcohol is added into a reactor provided with a titration device and a magnetic stirring device, and 25g of blue vitriod (CuSO) is firstly added under the stirring speed of 180rpm4·5H2O) is added into the reactor, 1.5g of polyvinylpyrrolidone (PVP) is added into the reactor, and then the stirring is carried out for 60min at 500 rpm;
c. dropwise adding the prepared alkaline potassium borohydride aqueous solution into a reactor at a titration rate of 0.5mL/s under a stirring rate of 180rpm, and stirring for 10min at 300rpm after dropwise adding;
d. then, filtering, washing the generated product for 6 times by using deionized water, after washing, putting the product into a vacuum drying oven, and carrying out vacuum drying for 8 hours at the temperature of 80 ℃ and the vacuum degree of 133Pa to obtain Cu particles with the average particle size of 50-100 nm;
(2) firstly, uniformly mixing 40g of methyl vinyl silicone rubber raw rubber and the prepared Cu particles in a torque rheometer, then carrying out heat treatment at the temperature of 170 ℃ for 60min, and cooling to room temperature to prepare a uniform mixed system;
(3) adding the prepared mixed system into a reactor provided with a stirring device, a heating device and a nitrogen protection device, introducing nitrogen for protection, sequentially adding 35g of tetramethylcyclotetrasiloxane, 20g of allyl glycidyl ether, 0.5g of chloroplatinic acid catalyst and 10g of polymethyl methacrylate (PMMA) into the reactor at a stirring speed of 180rpm, and stirring at 300 rpm;
then, reacting for 0.5h at the temperature of 20 ℃, heating to 70 ℃ at the speed of 2 ℃/min, reacting for 2h, heating to 120 ℃ at the speed of 2 ℃/min, reacting for 3h, and distilling the reaction mixture under reduced pressure at the temperature of 150 ℃ and the pressure of 4kPa until no low-boiling-point substance is evaporated out to prepare viscous liquid;
(4) uniformly coating the prepared viscous liquid on the central part of one side surface of a stainless steel foil 1 with the thickness of 0.3mm, the width of 100mm and the length of 100mm, putting the stainless steel foil 1 into a vacuum drying oven, and carrying out vacuum drying for 3h at the temperature of 80 ℃ and the vacuum degree of 133Pa to prepare a Cu-based elastic adhesive layer 2;
(5) the Cu-based elastic adhesive layer 2 prepared as described above was subjected to a performance test, and had a volume resistivity of 1.46. omega. cm, a peel strength with a stainless steel foil of 149N/cm, a peel strength with a flexible film (PI) of 137N/cm, and a spring back rate of 85%.
Claims (4)
1. The stainless steel substrate for the flexible solar cell is characterized by comprising a stainless steel foil (1), wherein a Cu-based elastic adhesion layer (2) is compounded at the central part of one side surface of the stainless steel foil (1), and one side surface of the Cu-based elastic adhesion layer (2) and one side surface of the stainless steel foil (1) are in elastic connection in an integrated forming mode;
the preparation method of the stainless steel substrate comprises the following steps:
copper sulfate pentahydrate is used as a raw material, potassium borohydride is used as a reducing agent, copper polyvinylpyrrolidone is used as a dispersing agent, a liquid phase reduction reaction is carried out under a strong alkali condition to prepare nano Cu particles, the nano Cu particles are firstly mixed with raw methyl vinyl silicone rubber to form a uniform mixed system, then the mixed system is reacted with raw material tetramethylcyclotetrasiloxane, coupling agent allyl glycidyl ether, catalyst chloroplatinic acid and adhesive polymethyl methacrylate under the protection of nitrogen, the reaction product is decompressed and distilled to prepare viscous liquid, the viscous liquid is uniformly coated on the central part of one side surface of a stainless steel foil (1), and then drying and curing treatment are carried out under a vacuum condition to prepare a Cu-based elastic adhesive layer (2) adhered to the surface of the stainless steel foil (1), so that the stainless steel substrate is prepared.
2. Stainless steel substrate according to claim 1, wherein said Cu-based elastic adhesion layer (2) comprises the following raw materials in parts by weight: 13 parts of potassium borohydride, 0.1 part of sodium hydroxide, 12.5-25 parts of copper sulfate pentahydrate, 0.5-1.5 parts of polyvinylpyrrolidone, 25-40 parts of methyl vinyl silicone rubber crude rubber, 20-35 parts of tetramethylcyclotetrasiloxane, 10-20 parts of allyl glycidyl ether, 0.5 part of chloroplatinic acid and 5-10 parts of polymethyl methacrylate.
3. Stainless steel substrate according to claim 1, wherein said Cu-based elastic adhesion layer (2) comprises the following raw materials in parts by weight: 13 parts of potassium borohydride, 0.1 part of sodium hydroxide, 18 parts of copper sulfate pentahydrate, 1 part of copper polyvinylpyrrolidone, 30 parts of raw rubber of methyl vinyl silicone rubber, 30 parts of tetramethylcyclotetrasiloxane, 15 parts of allyl glycidyl ether, 0.5 part of chloroplatinic acid catalyst and 8 parts of polymethyl methacrylate.
4. The stainless steel substrate according to claim 1, wherein said method for producing a stainless steel substrate comprises the steps of:
the method comprises the following steps: preparing Cu particles with the average particle size of 50-100 nm by using 13 parts of potassium borohydride, 0.1 part of sodium hydroxide, 12.5-25 parts of copper sulfate pentahydrate and 0.5-1.5 parts of copper polyvinylpyrrolidone as raw materials;
step two: firstly, uniformly mixing 25-40 parts of methyl vinyl silicone rubber raw rubber and the prepared Cu particles in a torque rheometer, then carrying out heat treatment at 130-170 ℃ for 20-60 min, and cooling to room temperature to prepare a uniform mixed system;
step three: adding the prepared mixed system into a reactor provided with a stirring device, a heating device and a nitrogen protection device, introducing nitrogen for protection, sequentially adding 20-35 parts of tetramethylcyclotetrasiloxane, 10-20 parts of allyl glycidyl ether, 0.5 part of chloroplatinic acid catalyst and 5-10 parts of polymethyl methacrylate into the reactor at a stirring speed of 120-180 rpm, and stirring at 200-300 rpm;
then, reacting for 0.5h at the temperature of 20 ℃, heating to 50-70 ℃ at the speed of 2 ℃/min, reacting for 1-2 h, heating to 80-120 ℃ at the speed of 2 ℃/min, reacting for 1-3 h, and distilling the reaction mixture under reduced pressure at the temperature of 130-150 ℃ and the pressure of 4kPa until no low-boiling-point substance is evaporated out to prepare viscous liquid;
step four: uniformly coating the prepared viscous liquid on the central part of one side surface of a stainless steel foil (1) with the thickness of 0.3mm, the width of 100mm and the length of 100mm, putting the stainless steel foil (1) into a vacuum drying oven, and carrying out vacuum drying for 1-3 h at the temperature of 60-80 ℃ under the vacuum degree of 133Pa to prepare a Cu-based elastic adhesive layer (2) adhered to the surface of the stainless steel foil (1), thereby preparing the stainless steel substrate.
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