CN117447759A - Method for preparing heat-insulating foam based on retired photovoltaic backboard and heat-insulating foam thereof - Google Patents
Method for preparing heat-insulating foam based on retired photovoltaic backboard and heat-insulating foam thereof Download PDFInfo
- Publication number
- CN117447759A CN117447759A CN202311480973.5A CN202311480973A CN117447759A CN 117447759 A CN117447759 A CN 117447759A CN 202311480973 A CN202311480973 A CN 202311480973A CN 117447759 A CN117447759 A CN 117447759A
- Authority
- CN
- China
- Prior art keywords
- retired
- photovoltaic back
- placing
- retired photovoltaic
- minutes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000006260 foam Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010791 quenching Methods 0.000 claims abstract description 21
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 229920002545 silicone oil Polymers 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 11
- 238000001291 vacuum drying Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000007731 hot pressing Methods 0.000 claims abstract description 5
- 238000010008 shearing Methods 0.000 claims abstract description 3
- 238000005187 foaming Methods 0.000 claims description 20
- 239000002937 thermal insulation foam Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 8
- -1 polydimethylsiloxane Polymers 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 2
- 239000011229 interlayer Substances 0.000 claims description 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000009738 saturating Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 abstract description 17
- 238000011161 development Methods 0.000 abstract description 3
- 229920006395 saturated elastomer Polymers 0.000 abstract 1
- 238000001878 scanning electron micrograph Methods 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 7
- 239000012634 fragment Substances 0.000 description 7
- 239000011521 glass Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 238000007790 scraping Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 6
- 229920000139 polyethylene terephthalate Polymers 0.000 description 6
- 239000005020 polyethylene terephthalate Substances 0.000 description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002313 adhesive film Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013012 foaming technology Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B2017/001—Pretreating the materials before recovery
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B2017/001—Pretreating the materials before recovery
- B29B2017/0015—Washing, rinsing
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/06—CO2, N2 or noble gases
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/08—Supercritical fluid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention provides a method for preparing heat-insulating foam based on retired photovoltaic back plates and the heat-insulating foam, which comprises the following steps: s1: mechanically separating the retired photovoltaic back plate from the photovoltaic module; s2: cleaning and shearing the retired photovoltaic backboard; s3: vacuum drying at 90deg.C for 12 hr; s4: placing the mixture into a hot press die for hot pressing for 20 minutes, and rapidly transferring the mixture for quenching; s5: annealing the quenched backboard material to obtain an annealed sample; s6: placing the annealed sample in a high-pressure reaction kettle, and introducing CO 2 The temperature is balanced at 32 ℃, and the pressure is increased to 7.5MPa, so that CO is obtained 2 Reach toIn a supercritical state, the foam is saturated for 72 hours, then the foam is quickly taken out and placed in silicone oil to be foamed for 20 seconds, and the foam is placed in cold water to be cooled and molded, so that the heat-insulating foam prepared by the method has good heat-insulating performance and has important significance for green sustainable development of the photovoltaic industry.
Description
Technical Field
The invention relates to the technical field of high polymer material foaming, in particular to a method for preparing heat insulation foam based on a retired photovoltaic backboard and heat insulation foam thereof.
Background
The photovoltaic backboard is used as a packaging material for back protection, is mainly used for resisting corrosion of environments such as damp heat to materials such as battery pieces and adhesive films, plays roles in corrosion resistance, oxidation resistance and insulation protection, can effectively prolong the service life of a component, and is generally divided into a fluorine-containing backboard and a non-fluorine-containing backboard, wherein the fluorine-containing backboard is TPT, TPE, TPC, CPC, and the non-fluorine-containing backboard is PET, PA/PO and the like.
When the photovoltaic module reaches the service life, the photovoltaic module needs to be recycled, and at present, the retired photovoltaic backboard is mainly recycled in modes of landfill, incineration, stacking and the like, which are mainly adopted in domestic and foreign treatment, aiming at the photovoltaic backboard in the photovoltaic module, and the retired photovoltaic backboard is mainly composed of polyethylene terephthalate (PET), so that the polyethylene terephthalate can be used for preparing foaming materials, and the prepared foaming materials have excellent heat resistance and mechanical properties and are widely applied to the fields of buildings, microwave containers, automobile inner plates, roof insulation, sports equipment, automobiles, aerospace industry and the like, so that a recycling treatment mode which is more environment-friendly for the retired photovoltaic board is needed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a method for preparing heat-insulating foam based on retired photovoltaic back plates and the heat-insulating foam thereof, and the prepared heat-insulating foam has good heat-insulating performance and has the advantage of great significance for green sustainable development of the photovoltaic industry.
The aim of the invention is achieved by the following technical scheme: a method for preparing heat insulation foam based on retired photovoltaic back plate comprises the following steps:
s1: mechanically separating the retired photovoltaic back plate from the photovoltaic module;
s2: cleaning and shearing the retired photovoltaic backboard;
s3: vacuum drying at 90deg.C for 12 hr;
s4: placing the mixture into a die, hot-pressing the mixture on a hot press for 20 minutes, and rapidly transferring the mixture to quench;
s5: annealing the quenched backboard material to obtain an annealed sample;
s6: placing the annealed sample in a high-pressure reaction kettle, and introducing CO 2 Heating to 32deg.C, pressurizing to 7.5MPa to make CO 2 And (3) reaching a supercritical state, saturating for 72 hours, rapidly taking out, placing in silicone oil, foaming for 10-20s, and placing in cold water for cooling and molding.
Preferably, in the step S1, the retired photovoltaic back plate is mechanically separated from the photovoltaic module by a hot knife device.
Preferably, the separated retired photovoltaic back sheet is used for removing the surface hard coating by a scraper.
Preferably, in S2, the size of the chopped retired photovoltaic back sheet is less than or equal to 2mm x 1mm (long x wide x high).
Preferably, in S4, the hot pressing specifically includes:
a. placing the dried retired photovoltaic backboard material into a mould, placing the mould on a hot press, and preheating for 10 minutes;
b. regulating the pressure of the hydraulic press to be less than or equal to 1MPa, prepressing for 2 minutes, releasing pressure, and repeating the prepressing action for 5 times;
c. pressurizing to 20MPa for 3min, rapidly transferring to quench, and taking out after 10s to obtain a quenched sample.
Preferably, in S5, the annealing specifically includes:
heating the oven to 100 ℃, putting the quenched sample and keeping for 10 minutes, and carrying out annealing treatment to obtain an annealed sample.
Preferably, in the step S6, the temperature of the silicone oil is in the range of 200-220 ℃.
Preferably, in S6, the silicone oil is polydimethylsiloxane.
The invention also discloses the heat-insulating foam prepared by the preparation method, which comprises the following raw materials: annealing the sample.
Preferably, the annealed sample is an interlayer PET material after retired photovoltaic back sheet stripping of the hardcoat.
In summary, the present invention includes at least one of the following beneficial technical effects:
1. according to the invention, waste utilization is carried out on the retired photovoltaic backboard, so that the waste of environmental resources is reduced, and the environment is protected;
2. according to the invention, the PET with higher purity is obtained as the recycling raw material through mechanically separating the retired photovoltaic backboard hard coating, so that the problem that mixed particles are difficult to foam and form after reprocessing due to low purity of backboard mixed particles obtained by a traditional broken retired photovoltaic module is avoided, and the supercritical CO is combined 2 The foaming technology and the heat treatment mode are adopted to successfully develop and prepare the heat insulation foam based on the retired photovoltaic backboard material by adopting a two-step method, the expansion rate of the obtained heat insulation foam can reach 5.3, and the heat conductivity coefficient is as low as 0.0473 W.m -1 K -1 。
3. The quenching and annealing operation can improve the melt strength of the retired photovoltaic back plate material, thereby being beneficial to subsequent foaming.
Drawings
FIG. 1 is a graph of rheological data of the present invention after quenching at 260℃test conditions and thermal annealing at different temperatures (100-115 ℃);
FIG. 2 is an SEM image of a rPET quenched sample of example 1 of the present invention at 220℃under 20s foaming conditions;
FIG. 3 is an SEM image of a rPET100℃annealed sample at 220℃under 20s foaming conditions in example 2 of the present invention;
FIG. 4 is an SEM image of a rPET100℃annealed sample at 210℃under 20s foaming conditions in example 2 of the present invention;
FIG. 5 is an SEM image of a rPET100℃annealed sample at 200℃under 20s foaming conditions in example 2 of the present invention;
FIG. 6 is an SEM image of a rPET100℃annealed sample at 220℃under 15s foaming conditions in example 2 of the present invention;
FIG. 7 is an SEM image of a rPET100℃annealed sample at 220℃under 10s foaming conditions in example 2 of the present invention;
FIG. 8 is an SEM image of a rPET100℃annealed sample of comparative example 1 of the present invention;
fig. 9 is an SEM micrograph of the invention prior to rPET processing.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without the benefit of the present disclosure, are intended to be within the scope of the present application based on the described embodiments.
Example 1:
s1, mechanically separating the photovoltaic back plate from the photovoltaic module by utilizing a thermal knife device for completely stripping the photovoltaic module back plate and glass on a platform, cleaning and wiping the photovoltaic back plate with clean water, scraping the hard coating with a scraper, and leaving an intermediate layer, namely rPET. Further cleaning rPET, cutting into fragments with the size smaller than 2mm, 2mm and 1mm (length, width and height), vacuum drying at 90 ℃ for 12h, putting a proper amount of rPET into a die with the size of 15mm, 10mm and 2mm, placing the die on a hot press, preheating for 10 minutes, then prepressing for 2 minutes without exceeding 1MPa, decompressing, repeating prepressing for 5 times, pressurizing to 20MPa, maintaining for 3 minutes, rapidly transferring and quenching, and fishing out after 10 seconds, thus obtaining a white blocky quenching sample.
S2, placing the quenched sample into a high-pressure reaction kettle, heating to 32 ℃ within 1 minute, and then introducing CO 2 Pressurizing to 7.5MPa within 3 minutes to ensure that C in the reaction kettle is formedO 2 And (3) reaching a supercritical state, standing for saturation for 72 hours, slowly releasing pressure, rapidly transferring to 220 ℃ silicone oil, foaming for 20 seconds, taking out, and cooling in cold water for molding. Foam samples were designated rPET-00.
Example 2:
s1, mechanically separating the photovoltaic back plate from the photovoltaic module by utilizing a thermal knife device for completely stripping the photovoltaic module back plate and glass on a platform, cleaning and wiping the photovoltaic back plate with clean water, scraping the hard coating with a scraper, and leaving an intermediate layer, namely rPET. Further cleaning rPET, cutting into fragments with the size smaller than 2mm, 2mm and 1mm (length, width and height), vacuum drying at 90 ℃ for 12h, putting a proper amount of rPET into a die with the size of 15mm, 10mm and 2mm, placing the die on a hot press, preheating for 10 minutes, then prepressing for 2 minutes without exceeding 1MPa, decompressing, repeating prepressing for 5 times, pressurizing to 20MPa, maintaining for 3 minutes, rapidly transferring and quenching, and fishing out after 10 seconds, thus obtaining a white blocky quenching sample. The oven was warmed to 100 ℃ and the quenched sample was held for 10 minutes.
S2, placing the annealed sample into a high-pressure reaction kettle, heating to 32 ℃ within 1 minute, and then introducing CO 2 Pressurizing to 7.5MPa within 3 minutes to enable CO in the reaction kettle to be discharged 2 And (3) reaching a supercritical state, standing for saturation for 72 hours, slowly releasing pressure, rapidly transferring to 220 ℃ silicone oil, foaming for 20 seconds, taking out, and cooling in cold water for molding. Foam samples were designated rPET-01.
Example 3:
s1, mechanically separating the photovoltaic back plate from the photovoltaic module by utilizing a thermal knife device for completely stripping the photovoltaic module back plate and glass on a platform, cleaning and wiping the photovoltaic back plate with clean water, scraping the hard coating with a scraper, and leaving an intermediate layer, namely rPET. Further cleaning rPET, cutting into fragments with the size smaller than 2mm, 2mm and 1mm (length, width and height), vacuum drying at 90 ℃ for 12h, putting a proper amount of rPET into a die with the size of 15mm, 10mm and 2mm, placing the die on a hot press, preheating for 10 minutes, then prepressing for 2 minutes without exceeding 1MPa, decompressing, repeating prepressing for 5 times, pressurizing to 20MPa, maintaining for 3 minutes, rapidly transferring and quenching, and fishing out after 10 seconds, thus obtaining a white blocky quenching sample. The oven was warmed to 100 ℃ and the quenched sample was held for 10 minutes.
S2, placing the annealed sample into a high-pressure reaction kettle, heating to 32 ℃ within 1 minute, and then introducing CO 2 Pressurizing to 7.5MPa within 3 minutes to enable CO in the reaction kettle to be discharged 2 And (3) reaching a supercritical state, standing for saturation for 72 hours, slowly releasing pressure, rapidly transferring to 210 ℃ silicone oil, foaming for 20 seconds, taking out, and cooling in cold water for molding. Foam samples were designated rPET-02.
Example 4:
s1, mechanically separating the photovoltaic back plate from the photovoltaic module by utilizing a thermal knife device for completely stripping the photovoltaic module back plate and glass on a platform, cleaning and wiping the photovoltaic back plate with clean water, scraping the hard coating with a scraper, and leaving an intermediate layer, namely rPET. Further cleaning rPET, cutting into fragments with the size smaller than 2mm, 2mm and 1mm (length, width and height), vacuum drying at 90 ℃ for 12h, putting a proper amount of rPET into a die with the size of 15mm, 10mm and 2mm, placing the die on a hot press, preheating for 10 minutes, then prepressing for 2 minutes without exceeding 1MPa, decompressing, repeating prepressing for 5 times, pressurizing to 20MPa, maintaining for 3 minutes, rapidly transferring and quenching, and fishing out after 10 seconds, thus obtaining a white blocky quenching sample. The oven was warmed to 100 ℃ and the quenched sample was held for 10 minutes.
S2, placing the annealed sample into a high-pressure reaction kettle, heating to 32 ℃ within 1 minute, and then introducing CO 2 Pressurizing to 7.5MPa within 3 minutes to enable CO in the reaction kettle to be discharged 2 And (3) reaching a supercritical state, standing for saturation for 72 hours, slowly releasing pressure, rapidly transferring to 200 ℃ silicone oil, foaming for 20 seconds, taking out, and cooling in cold water for molding. Foam samples were designated rPET-03.
Example 5:
s1, mechanically separating the photovoltaic back plate from the photovoltaic module by utilizing a thermal knife device for completely stripping the photovoltaic module back plate and glass on a platform, cleaning and wiping the photovoltaic back plate with clean water, scraping the hard coating with a scraper, and leaving an intermediate layer, namely rPET. Further cleaning rPET, cutting into fragments with the size smaller than 2mm, 2mm and 1mm (length, width and height), vacuum drying at 90 ℃ for 12h, putting a proper amount of rPET into a die with the size of 15mm, 10mm and 2mm, placing the die on a hot press, preheating for 10 minutes, then prepressing for 2 minutes without exceeding 1MPa, decompressing, repeating prepressing for 5 times, pressurizing to 20MPa, maintaining for 3 minutes, rapidly transferring and quenching, and fishing out after 10 seconds, thus obtaining a white blocky quenching sample. The oven was warmed to 100 ℃ and the quenched sample was held for 10 minutes.
S2, placing the annealed sample into a high-pressure reaction kettle, heating to 32 ℃ within 1 minute, and then introducing CO 2 Pressurizing to 7.5MPa within 3 minutes to enable CO in the reaction kettle to be discharged 2 And (3) reaching a supercritical state, standing for saturation for 72 hours, slowly releasing pressure, rapidly transferring to 220 ℃ silicone oil, foaming for 15 seconds, taking out, and cooling in cold water for molding. Foam samples were designated rPET-11.
Example 6:
s1, mechanically separating the photovoltaic back plate from the photovoltaic module by utilizing a thermal knife device for completely stripping the photovoltaic module back plate and glass on a platform, cleaning and wiping the photovoltaic back plate with clean water, scraping the hard coating with a scraper, and leaving an intermediate layer, namely rPET. Further cleaning rPET, cutting into fragments with the size smaller than 2mm, 2mm and 1mm (length, width and height), vacuum drying at 90 ℃ for 12h, putting a proper amount of rPET into a die with the size of 15mm, 10mm and 2mm, placing the die on a hot press, preheating for 10 minutes, then prepressing for 2 minutes without exceeding 1MPa, decompressing, repeating prepressing for 5 times, pressurizing to 20MPa, maintaining for 3 minutes, rapidly transferring and quenching, and fishing out after 10 seconds, thus obtaining a white blocky quenching sample. The oven was warmed to 100 ℃ and the quenched sample was held for 10 minutes.
S2, placing the annealed sample into a high-pressure reaction kettle, heating to 32 ℃ within 1 minute, and then introducing CO 2 Pressurizing to 7.5MPa within 3 minutes to enable CO in the reaction kettle to be discharged 2 And (3) reaching a supercritical state, standing for saturation for 72 hours, slowly releasing pressure, rapidly transferring to 220 ℃ silicone oil, foaming for 10 seconds, taking out, and cooling in cold water for molding. Foam samples were designated rPET-21.
Comparative example 1:
firstly, mechanically separating the photovoltaic backboard from the photovoltaic module by using a platform type thermal knife device for completely stripping the backboard and glass of the photovoltaic module, cleaning and wiping the photovoltaic backboard with clean water, scraping the hard coating with a scraper, and obtaining the rPET as the remained intermediate layer. Further cleaning rPET, cutting into fragments with the size smaller than 2mm, 1mm (length, width, height), vacuum drying at 90 ℃ for 12h, placing a proper amount of rPET into a die with the size of 15mm, 3mm on a hot press, preheating for 10 minutes, prepressing for 2 minutes without exceeding 1MPa, decompressing, repeating prepressing for 5 times, pressurizing to 20MPa, maintaining for 3 minutes, rapidly transferring and quenching, and fishing out after 10 seconds to obtain a white blocky quenching sample. The quenched sample was designated rPET-0.
Thermal conductivity refers to the ratio of the amount of heat transferred per unit area per unit time to the temperature gradient. During heat transfer, heat is transferred from a high temperature region to a low temperature region at a rate related to the thermal conductivity of the substance. The larger the thermal conductivity, the stronger the mass transfer capability and the faster the heat transfer rate.
The thermal conductivity was measured according to the ISO 22007-2 transient planar Heat Source method.
TABLE 1 Process conditions and thermal insulation Properties of examples and comparative examples according to the invention
FIG. 1 shows the rheological behavior of rPET quenched at 260oC and thermally annealed at different temperatures (100-115 oC), wherein (a) is apparent viscosity, (b) is storage modulus, (c) is loss modulus, and (d) is loss factor, and according to the analysis of rheological test data in FIG. 1, the preparation method disclosed by the invention effectively improves the melt strength of retired photovoltaic back sheet material, is more beneficial to subsequent foaming, and obtains more excellent heat insulation performance. In combination with the SEM micrographs of examples 1 to 6 and comparative example 1 of the thermal insulation foam prepared by the method of the present invention shown in fig. 2 to 8 and the contents shown in table 1, the thermal insulation foam obtained by the method of the present invention has a dense microcellular structure, and the formation of cells greatly reduces the thermal conductivity and has excellent thermal insulation properties, compared with the SEM micrograph contents of the rPET material before processing shown in fig. 9.
In summary, the preparation method adopted by the invention solves the problem of waste of a series of environmental problems and resources caused by the traditional treatment mode of the retired photovoltaic plate, and the prepared foaming material has the advantages of small heat conductivity coefficient and better heat insulation performance, and has important significance for green sustainable development of the photovoltaic industry.
The embodiments of the present invention are all preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (10)
1. The method for preparing the heat insulation foam based on the retired photovoltaic back plate is characterized by comprising the following steps of:
s1: mechanically separating the retired photovoltaic back plate from the assembly;
s2: cleaning and shearing the retired photovoltaic backboard;
s3: vacuum drying at 90deg.C for 12 hr;
s4: placing the mixture into a die, hot-pressing the mixture on a hot press for 20 minutes, and rapidly transferring the mixture to quench;
s5: annealing the quenched backboard material to obtain an annealed sample;
s6: placing the annealed sample in a high-pressure reaction kettle, and introducing CO 2 Heating to 32deg.C, pressurizing to 7.5MPa to make CO 2 And (3) reaching a supercritical state, saturating for 72 hours, rapidly taking out, placing in silicone oil, foaming for 10-20s, and placing in cold water for cooling and molding.
2. The method for preparing heat insulation foam based on the retired photovoltaic back plate according to claim 1, wherein in S1, a hot knife device is adopted to mechanically separate the retired photovoltaic back plate from the photovoltaic component.
3. The method for preparing heat insulation foam based on the retired photovoltaic back plate according to claim 2, wherein the separated retired photovoltaic back plate is removed of the surface hard coating by a scraper.
4. The method for preparing thermal insulation foam based on retired photovoltaic back plates according to claim 1, wherein in S2, the size of the retired photovoltaic back plates cut is less than or equal to 2mm x 1mm (length x width x height).
5. The method for preparing heat insulation foam based on retired photovoltaic back sheet according to claim 1, wherein in S4, the specific hot pressing steps are as follows:
a. placing the dried retired photovoltaic panel into a mould, placing the mould on a hot press, and preheating for 10 minutes;
b. regulating the pressure of the hydraulic press to be less than or equal to 1MPa, prepressing for 2 minutes, releasing pressure, and repeating the prepressing action for 5 times;
c. pressurizing to 20MPa for 3min, rapidly transferring to quench, and taking out after 10s to obtain a quenched sample.
6. The method for preparing heat insulation foam based on retired photovoltaic back sheet according to claim 1, wherein in S5, the annealing specific steps are as follows:
heating the oven to 100 ℃, putting the quenched sample and keeping for 10 minutes, and carrying out annealing treatment to obtain an annealed sample.
7. The method for preparing heat insulation foam based on retired photovoltaic back sheet according to claim 1, wherein in S6, the temperature of silicone oil is in the range of 200-220 ℃.
8. The method for preparing heat insulation foam based on retired photovoltaic back sheet according to claim 1 or 7, wherein in S6, the silicone oil is polydimethylsiloxane.
9. A thermal insulation foam prepared by the method of preparation of claim 1, wherein the thermal insulation foam comprises the following raw materials: annealing the sample.
10. The insulating foam of claim 9, wherein the annealed sample is an interlayer PET material after retired photovoltaic back sheet stripping of the hardcoat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311480973.5A CN117447759A (en) | 2023-11-08 | 2023-11-08 | Method for preparing heat-insulating foam based on retired photovoltaic backboard and heat-insulating foam thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311480973.5A CN117447759A (en) | 2023-11-08 | 2023-11-08 | Method for preparing heat-insulating foam based on retired photovoltaic backboard and heat-insulating foam thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117447759A true CN117447759A (en) | 2024-01-26 |
Family
ID=89596431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311480973.5A Pending CN117447759A (en) | 2023-11-08 | 2023-11-08 | Method for preparing heat-insulating foam based on retired photovoltaic backboard and heat-insulating foam thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117447759A (en) |
-
2023
- 2023-11-08 CN CN202311480973.5A patent/CN117447759A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114736493B (en) | Polyester glass polymer, foaming material and preparation method thereof | |
| CN106807425A (en) | Discarded carbon fiber resin matrix composite pyrolysis catalysts and recovery carbon fiber method | |
| CN108409985B (en) | Method for improving foaming ratio of polylactic acid through pre-isothermal cold crystallization treatment | |
| CN111704741A (en) | PVA (polyvinyl alcohol) foam material and foaming method thereof | |
| CN117447759A (en) | Method for preparing heat-insulating foam based on retired photovoltaic backboard and heat-insulating foam thereof | |
| CN113698888B (en) | High-temperature-resistant high-molecular industrial adhesive tape and preparation process thereof | |
| CN114148048A (en) | High-heat-dissipation aluminum-based copper-clad plate and preparation method thereof | |
| CN111793263B (en) | Rubber-plastic crosslinked foaming heat-insulating packaging box and injection molding process | |
| CN107778681A (en) | A kind of high insulating extruded board of low heat conduction and preparation method thereof | |
| CN104710659B (en) | The textile waste matrix damping vibration attenuation composite of collaborative hydridization and manufacture method thereof | |
| CN105754213A (en) | Straw-containing wood-plastic outdoor floor and production method thereof | |
| CN103382262B (en) | Method for preparing PPESK through super-critical CO2 foaming | |
| CN108275886B (en) | Aerogel heat preservation felt prepared from industrial solid waste and preparation method | |
| CN110511029A (en) | A kind of method that binder free graphene oxide prepares high orientation graphite block body | |
| CN115304824A (en) | Kapok fiber-based vacuum insulation panel and preparation method and application thereof | |
| CN112538177B (en) | Quick freezing preparation method of carbon material oriented heat-conducting interface material | |
| CN114683647B (en) | Shape memory polyimide plate and preparation method thereof | |
| CN109096632A (en) | A kind of polystyrene foam heat insulation material and preparation method | |
| CN104995759B (en) | Secondary cell liner | |
| CN111441139B (en) | Preparation method of liquid crystal polymer film | |
| CN102806673A (en) | Method for producing teflon-recycled turned plates | |
| CN109159237A (en) | A kind of production method of bath bucket timber | |
| CN109016028A (en) | A kind of manufacturing process of plate | |
| CN102367361B (en) | Novel capacitor aluminum casing film coating paint and preparation method thereof | |
| CN111635632A (en) | High-molecular chemical material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |