CN103788594A - Formula of bidirectional stretched polyester film for solar backboard and preparation method thereof - Google Patents

Formula of bidirectional stretched polyester film for solar backboard and preparation method thereof Download PDF

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Publication number
CN103788594A
CN103788594A CN201310731940.3A CN201310731940A CN103788594A CN 103788594 A CN103788594 A CN 103788594A CN 201310731940 A CN201310731940 A CN 201310731940A CN 103788594 A CN103788594 A CN 103788594A
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CN
China
Prior art keywords
formula
polyester film
sun power
way stretch
power backboard
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
Application number
CN201310731940.3A
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Chinese (zh)
Inventor
赵烨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
QINGDAO RINENG STRECH FILM TECHNOLOGY Co Ltd
Original Assignee
QINGDAO RINENG STRECH FILM TECHNOLOGY Co Ltd
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by QINGDAO RINENG STRECH FILM TECHNOLOGY Co Ltd filed Critical QINGDAO RINENG STRECH FILM TECHNOLOGY Co Ltd
Priority to CN201310731940.3A priority Critical patent/CN103788594A/en
Publication of CN103788594A publication Critical patent/CN103788594A/en
Pending legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/88Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911Cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/04Particle-shaped
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/78Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/875Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling for achieving a non-uniform temperature distribution, e.g. using barrels having both cooling and heating zones
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/88Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91Heating, e.g. for cross linking
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/92Measuring, controlling or regulating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92504Controlled parameter
    • B29C2948/92704Temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92819Location or phase of control
    • B29C2948/92857Extrusion unit
    • B29C2948/92876Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895Barrel or housing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92819Location or phase of control
    • B29C2948/92923Calibration, after-treatment or cooling zone

Abstract

The invention discloses a formula of a bidirectional stretched polyester film for a solar backboard and a preparation method of the polyester film. The formula consists of special master batch and polyethylene glycol terephthalate and is characterized in that the special master batch comprises the following components in parts by weight: 60-80 parts of polyethylene glycol terephthalate, 20-30 parts of coloring agent, 0.5-5 parts of filling agent and 1-5 parts of nucleating agent. The formula is improved in the term of the master batch, keeps the physical property of an ordinary formula; the polyester film has high strength, high temperature resistance and high weather resistance, is convenient to use, highlights the characteristics of a solar backboard film, has the characteristics of low water permeation rate and insulation property, and is tear resisting, non-toxic, corrosion resisting, flame retarding, safe and environment-friendly, and the properties cooperate and complement with one another with remarkable effects in the application process.

Description

A kind of formula for two-way stretch sun power backboard polyester film and preparation method thereof
Technical field
The invention belongs to the technical field of compositions of macromolecular compound, be specifically related to a kind of formula for two-way stretch sun power backboard polyester film and preparation method thereof.
Technical background
Sun power backboard is positioned at the back side of solar panel, and cell piece is played to protection and supporting role, has reliable insulativity, water preventing ability, ageing resistance.Generally have three-decker, outer protective layer PVDF has good anti-environmental attack ability, and middle layer is that PET mylar has good insulating property, and internal layer PVDF and EVA have good adhesiveproperties.
Biaxially oriented polyester film, be utilize and have light material (also claiming has greatly light material, is to be 0.1% at starting material polyester slice content of titanium dioxide, through super-dry, melting, extrude, the high-grade film of slab and vertically and horizontally stretching, of many uses).Biaxially oriented polyester film has that intensity is high, good rigidly, transparent, glossiness high; Odorless, tasteless, colourless, nontoxic, outstanding obdurability; Its tensile strength is PC film, nylon membrane 3 times, and shock strength is high, has fabulous wear resistance, folding resistance, pinhole resistance and tear strength etc.; Heat-shrinkable is minimum, at 120 ℃, after 15 minutes, only shrinks 1.25%; There is good static resistance, easily carry out vacuum aluminum-coatedly, can be coated with PVDC, thereby improve the sticking power of its heat sealability, barrier and printing; Biaxially oriented polyester film also has boiling resistance, the low temperature resistant freezing property of good thermotolerance, excellence, good oil-proofness and chemical-resistant etc.Biaxially oriented polyester film is except oil of mirbane, chloroform, phenylcarbinol, and most of chemical all can not make it dissolve.But, biaxially oriented polyester film can be subject to the erosion of highly basic, when use, should note.
Titanium dioxide belongs to the material of Heat stability is good, and good insulating property, just meets the requirement of blooming thermostability, is best tinting material.Light calcium carbonate powder can improve the insulation effect of film, and talcum powder can improve PET Tc, meets the requirement of blooming prolongation crystallization time.Because biaxially oriented polyester film can be widely used in the compound critical material of sun power backboard, be mainly used in solar cell industry, because present this series products is mainly by import, there is at home the wide market space.
Two-way stretch sun power backboard mylar batching is critical process, directly affects processing plasticizing performance and weather resisteant energy.Require the continuity of high-precision mixing equipment and feed batch mixing.Want continous batching batch mixing feed, in the time occurring that feed interrupts, will isolate in time the product of producing between the date of retirement.On expressing technique, emphasis is technological temperature, and it will directly affect the plasticizing quality of melt.General technology temperature can be different because of the difference of forcing machine plasticizing capacity and screw form.Moulding slab is also two-way stretch sun power backboard mylar critical process, because crystallization rate directly affects optical property, how to make slab degree of crystallinity reach the requirement of sun power backboard membrane, is the technical problem to be solved in the present invention.
summary of the invention:
In order to make biaxially oriented film meet the requirement of sun power backboard purposes, the object of the present invention is to provide one for two-way stretch sun power backboard polyester film, can increase the saturating rate of insulating property, anti-hydrolytic performance and water and the ageing-resistant performance of two-way stretch sun power backboard mylar.
The technical scheme that the present invention takes is:
For a formula for two-way stretch sun power backboard polyester film, formed by dedicated parent material and polyethylene terephthalate, it is characterized in that, the each component of dedicated parent material is composed as follows according to weight part:
Polyethylene terephthalate 60-80 part, tinting material 20-30 part, weighting agent 0.5-5 part, nucleator 1-5 part.
Above-mentioned a kind of formula for two-way stretch sun power backboard polyester film, is characterized in that, adopts the section of polyethylene terephthalate particle, and the particle of 5-30% is for the formula of dedicated parent material.
Above-mentioned tinting material is titanium dioxide, and formal name used at school is rutile titanium dioxide.
Above-mentioned weighting agent is light calcium carbonate powder.
Above-mentioned nucleator is talcum powder.
For a making method for two-way stretch sun power backboard polyester film formula, it is characterized in that, comprise the steps:
(1) dedicated parent material mixes: will get polyethylene terephthalate pellet abrasive dust according to composition of raw materials, and add tinting material by formula requirement, and weighting agent, nucleator, and with being mixed evenly under dedicated mixer normal temperature;
(2) granulation: mixing raw material obtained above is dropped into dual-screw pelletizer, control prilling temperature: 225 ° of C of preheating section, 265 ° of transportation sections C, 275 ° of C of homogenizing zone, 265 ° of C of nozzle, carry out granulation, and after cold process is dry, warehouse-in is for masking.
In above-mentioned step (3), extrusion temperature is set as 255 ° of C of preheating section, 265 ° of transportation sections C, 275 ° of C of homogenizing zone, 265 ° of C of melt pipe, 265 ° of C of die head.
25 ° of C of slab temperature in above-mentioned step (3).
In above-mentioned step (3), the each district of longitudinal stretching temperature is: 75 ° of preheating zones C, 83 ° of drawing zones, 25 ° of C shaping areas C, 18 ° of cooling zones C.
In above-mentioned step (3), the each district of cross directional stretch temperature is: 125 ° of preheating zones C, 130 ° of drawing zones, 225 ° of C shaping areas C, 35 ° of cooling zones C.
The step of making polyester film by above-mentioned formula is: get dedicated parent material and polyethylene terephthalate pellet input material-compound tank according to weight ratio 3:7, after mixing, static mixer enters twin screw extruder fusion plastification, extrude slab, longitudinal stretching, cross directional stretch.
Beneficial effect of the present invention is:
1, the present invention is on the basis of traditional two-way stretch mylar formula, on masterbatch, is improved, and has kept the physical property of regular convention formula, has high strength, high temperature resistant, high weather resisteant energy.
2, there is good insulating performance.The present invention fills a prescription, and to produce biaxially oriented polyester film insulating property outstanding, and on same production unit, the product that this formula is produced more than electrical strength reaches 65v/um frequently, meets sun power backboard membrane characteristic completely.
3, easy to use, the present invention, only to masterbatch modification, does not affect the normal use of other operations of production line.
4, give prominence to the characteristic of sun power backboard membrane, there is the feature of low permeability rate and insulating property, resistance to tearing, nontoxic, corrosion-resistant, fire-retardant, safety and environmental protection.
5, formula of the present invention is in application process, the mutual cooperative compensating of performance, and titanium dioxide and light calcium carbonate powder are good insulating material, nucleator extends crystallization time, uses together successful.
Embodiment
embodiment 1:
Get the required starting material of formula ready, and polyethylene terephthalate pellet abrasive dust.Claim 73 parts of polyethylene terephthalates, eliminate 20 parts, white powder, light calcium carbonate powder accounts for 2 parts, 5 parts of talcum powder.With mixing under dedicated mixer normal temperature.Drop into again dual-screw pelletizer and carry out granulation, prilling temperature: 225 ° of C of preheating section; 265 ° of transportation sections C; 275 ° of C of homogenizing zone; 265 ° of C of nozzle.Masterbatch good granulation is sent to storage silo after cold process is dry.Get again 30 parts of these dedicated parent materials and 70 parts of polyethylene terephthalate pellets and drop into material-compound tanks enter twin screw extruder fusion plastification after static mixer mixes, extrude slab, longitudinal stretching, cross directional stretch.Extrusion temperature is set as 255 ° of C of preheating section; 265 ° of transportation sections C; 275 ° of C of homogenizing zone; 265 ° of C of melt pipe; 265 ° of C of die head.25 ° of C of slab temperature, the each district of longitudinal stretching temperature is: 75 ° of preheating zones C, 83 ° of drawing zones, 25 ° of C shaping areas C, 18 ° of cooling zones C.The each district of cross directional stretch temperature is: 125 ° of preheating zones C, 130 ° of drawing zones, 225 ° of C shaping areas C, 35 ° of cooling zones C.
embodiment 2:
Get the required starting material of formula ready, and polyethylene terephthalate pellet abrasive dust.Claim 68 parts of polyethylene terephthalates, eliminate 25 parts, white powder, 2 parts, light calcium carbonate powder, 5 parts of talcum powder.With mixing under dedicated mixer normal temperature.Drop into again dual-screw pelletizer and carry out granulation, prilling temperature: 225 ° of C of preheating section; 265 ° of transportation sections C; 275 ° of C of homogenizing zone; 265 ° of C of nozzle.Masterbatch good granulation is sent to storage silo after cold process is dry.Get again 30 parts of these dedicated parent materials and 70 parts of polyethylene terephthalate pellets and drop into material-compound tanks enter twin screw extruder fusion plastification after static mixer mixes, extrude slab, longitudinal stretching, cross directional stretch.Extrusion temperature is set as 255 ° of C of preheating section; 265 ° of transportation sections C; 275 ° of C of homogenizing zone; 265 ° of C of melt pipe; 265 ° of C of die head.25 ° of C of slab temperature, the each district of longitudinal stretching temperature is: 75 ° of preheating zones C, 83 ° of drawing zones, 25 ° of C shaping areas C, 18 ° of cooling zones C.The each district of cross directional stretch temperature is: 125 ° of preheating zones C, 130 ° of drawing zones, 225 ° of C shaping areas C, 35 ° of cooling zones C.
embodiment 3:
Get the required starting material of formula ready, and polyethylene terephthalate pellet abrasive dust.Claim 63 parts of polyethylene terephthalates, eliminate 30 parts, white powder, light calcium carbonate powder accounts for 2 parts, 5 parts of talcum powder.With mixing under dedicated mixer normal temperature.Drop into again dual-screw pelletizer and carry out granulation, prilling temperature: 225 ° of C of preheating section; 265 ° of transportation sections C; 275 ° of C of homogenizing zone; 265 ° of C of nozzle.Masterbatch good granulation is sent to storage silo after cold process is dry.Get again 30 parts of these dedicated parent materials and 70 parts of polyethylene terephthalate pellets and drop into material-compound tanks enter twin screw extruder fusion plastification after static mixer mixes, extrude slab, longitudinal stretching, cross directional stretch.Extrusion temperature is set as 255 ° of C of preheating section; 265 ° of transportation sections C; 275 ° of C of homogenizing zone; 265 ° of C of melt pipe; 265 ° of C of die head.25 ° of C of slab temperature, the each district of longitudinal stretching temperature is: 75 ° of preheating zones C, 83 ° of drawing zones, 25 ° of C shaping areas C, 18 ° of cooling zones C.The each district of cross directional stretch temperature is: 125 ° of preheating zones C, 130 ° of drawing zones, 225 ° of C shaping areas C, 35 ° of cooling zones C.

Claims (10)

1. for a formula for two-way stretch sun power backboard polyester film, be made up of dedicated parent material and polyethylene terephthalate, it is characterized in that, the each component of dedicated parent material is composed as follows according to weight part:
Polyethylene terephthalate 60-80 part, tinting material 20-30 part, weighting agent 0.5-5 part, nucleator 1-5 part.
2. a kind of formula for two-way stretch sun power backboard polyester film according to claim 1, is characterized in that, adopts the section of polyethylene terephthalate particle, and the particle of 5-30% is for the formula of dedicated parent material.
3. a kind of formula for two-way stretch sun power backboard polyester film according to claim 1, is characterized in that, described tinting material is titanium dioxide, and formal name used at school is rutile titanium dioxide.
4. a kind of formula for two-way stretch sun power backboard polyester film according to claim 1, is characterized in that, described weighting agent is light calcium carbonate powder.
5. a kind of formula for two-way stretch sun power backboard polyester film according to claim 1, is characterized in that, described nucleator is talcum powder.
6. for a making method for two-way stretch sun power backboard polyester film formula, it is characterized in that, comprise the steps:
(1) dedicated parent material mixes: will get polyethylene terephthalate pellet abrasive dust according to composition of raw materials, and add tinting material by formula requirement, and weighting agent, nucleator, and with being mixed evenly under dedicated mixer normal temperature;
(2) granulation: mixing raw material obtained above is dropped into dual-screw pelletizer, control prilling temperature: 225 ° of C of preheating section, 265 ° of transportation sections C, 275 ° of C of homogenizing zone, 265 ° of C of nozzle, carry out granulation, and after cold process is dry, warehouse-in is for masking.
7. a kind of making method for two-way stretch sun power backboard polyester film formula according to claim 6, is characterized in that, in described step (3), extrusion temperature is set as 255 ° of C of preheating section, 265 ° of transportation sections C, 275 ° of C of homogenizing zone, 265 ° of C of melt pipe, 265 ° of C of die head.
8. a kind of making method for two-way stretch sun power backboard polyester film formula according to claim 6, is characterized in that 25 ° of C of slab temperature in described step (3).
9. a kind of making method for two-way stretch sun power backboard polyester film formula according to claim 6, it is characterized in that, in described step (3), the each district of longitudinal stretching temperature is: 75 ° of preheating zones C, 83 ° of drawing zones, 25 ° of C shaping areas C, 18 ° of cooling zones C.
10. a kind of making method for two-way stretch sun power backboard polyester film formula according to claim 6, it is characterized in that, in described step (3), the each district of cross directional stretch temperature is: 125 ° of preheating zones C, 130 ° of drawing zones, 225 ° of C shaping areas C, 35 ° of cooling zones C.
CN201310731940.3A 2013-12-27 2013-12-27 Formula of bidirectional stretched polyester film for solar backboard and preparation method thereof Pending CN103788594A (en)

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Application Number Priority Date Filing Date Title
CN201310731940.3A CN103788594A (en) 2013-12-27 2013-12-27 Formula of bidirectional stretched polyester film for solar backboard and preparation method thereof

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105038156A (en) * 2015-08-28 2015-11-11 佛山杜邦鸿基薄膜有限公司 Solar cell backboard polyester film with high reflectivity and preparing method of solar cell backboard polyester film
CN107682766A (en) * 2017-09-19 2018-02-09 合肥惠科金扬科技有限公司 A kind of connection component of bluetooth earphone
CN107864445A (en) * 2017-09-19 2018-03-30 合肥惠科金扬科技有限公司 A kind of manufacturing process of the connection component of bluetooth earphone
CN108976725A (en) * 2018-07-30 2018-12-11 合肥尚强电气科技有限公司 A kind of preparation method suitable for electrical industry high-performance polyester film

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN102529258A (en) * 2010-10-20 2012-07-04 苏州尚善新材料科技有限公司 Improved solar cell assembly back plate and manufacturing method thereof
CN202319195U (en) * 2011-11-25 2012-07-11 宁波长阳科技有限公司 Solar cell backplane

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Publication number Priority date Publication date Assignee Title
CN102529258A (en) * 2010-10-20 2012-07-04 苏州尚善新材料科技有限公司 Improved solar cell assembly back plate and manufacturing method thereof
CN202319195U (en) * 2011-11-25 2012-07-11 宁波长阳科技有限公司 Solar cell backplane

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105038156A (en) * 2015-08-28 2015-11-11 佛山杜邦鸿基薄膜有限公司 Solar cell backboard polyester film with high reflectivity and preparing method of solar cell backboard polyester film
CN107682766A (en) * 2017-09-19 2018-02-09 合肥惠科金扬科技有限公司 A kind of connection component of bluetooth earphone
CN107864445A (en) * 2017-09-19 2018-03-30 合肥惠科金扬科技有限公司 A kind of manufacturing process of the connection component of bluetooth earphone
CN108976725A (en) * 2018-07-30 2018-12-11 合肥尚强电气科技有限公司 A kind of preparation method suitable for electrical industry high-performance polyester film

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Application publication date: 20140514