CN109943040A - Double-layer structure transparent PET backboard and its processing method - Google Patents
Double-layer structure transparent PET backboard and its processing method Download PDFInfo
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- CN109943040A CN109943040A CN201910160321.0A CN201910160321A CN109943040A CN 109943040 A CN109943040 A CN 109943040A CN 201910160321 A CN201910160321 A CN 201910160321A CN 109943040 A CN109943040 A CN 109943040A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The present invention relates to the technical field of solar power generation more particularly to a kind of double-layer structure transparent PET backboards.Structure can be divided into air layer and EVA layer in transparent PET backboard, and air layer and EVA layer add compatilizer and carry out toughening, and the improvement of addition PE class polyolefin and EVA bonding force, no longer need to carry out pet sheet face coating processing in EVA layer.The disadvantage for overcoming the high cost of existing transparent back panel, xanthochromia, production yield lower, go out and modified PET technology by using double-layer coextrusion, remain the high intensity of PET, PE component is added in internal layer PET simultaneously, it solves the problems, such as Nian Jie with EVA, the water vapor transmittance and water absorption rate of PET are reduced simultaneously, improve the weather resistance of PET, backboard xanthochromia is effectively reduced, simple production process simultaneously, one-pass molding, cost is relatively low, wearability is good, can meet current photovoltaic module in some region use demands that have a moderate climate.
Description
Technical field
The present invention relates to a kind of PET backboard more particularly to a kind of double-layer structure transparent PET backboard and its processing methods.
Background technique
Solar cell module is by 5 layers of structure composition, photovoltaic glass, high transparency EVA, cell piece, ultraviolet high-barrier EVA,
Photovoltaic back；Encapsulating material of the photovoltaic back as component backboard, it is main to play insulation, water vapor rejection, increase reflection and other effects.
Conventional solar energy backboard is combined by multilayer material, is with the most common compound KPE fabric backplanes in the market
Example, structure are three layers, and outermost layer (backboard air contact surfaces) is PVDF, and middle layer of PET, inner layer material (EVA adhesive layer) is
Improved polyalkene film.Common photovoltaic back is white in the market, and outer layer and inner layer material add titanium dioxide, ultraviolet to obstruct
Line protects PET not by the destruction of ultraviolet light.
In recent years, as the increasingly mature of generating electricity on two sides technology is compared with conventional photovoltaic traditional components, the generating electricity on two sides back side
Battery can efficiently use the light scattered in air with backside reflection, realize the gain of component power.For generating electricity on two sides group
Part, the light transmittance at the back side are an important indexs, and used back board packaging material is mainly that photovoltaic glass (replaces opaque
Photovoltaic back), it is good that the advantage of glass is weather resistance, but finds in actual use, uses glass tape as back side material
Expect to carry out serious PID effect, module backside power attenuation reaches 15% ~ 20% or more, and uses the transparent of high molecular material preparation
Backboard is in assembly in application process without back side PID phenomenon；
Over several years recently, in the research for carrying out transparent photovoltaic backplane technology, primary structure is as follows for major backboard manufacturer:
| Air surface | Bonding plane | Middle layer | Bonding plane | The face EVA | |
| KPC(TPC) | PVDF(PVF) | PU | PET | / | Coating |
| CPC | Coating | / | PET | / | Coating |
| KPE(TPE) | PVDF(PVF) | PU | PET | PU | PE |
| KPK | PVDF | PU | PET | PU | PVDF |
However transparent photovoltaic backplane technology is immature, main problem is as follows:
1) backboard production yield is lower, high expensive；
2) backboard weatherability is poor, and aging post yellowing and mist degree are higher, influences light transmittance, reduction group valence generated output；
3) backboard is low with EVA bonding force.
Currently, CPC structured transparent, making technology is simple, but is applied to outer layer service life deficiency, while coating wear resistance
It is poor；It is preferable using PVF film properties weatherability, stability, but it is expensive, and it is not yet complete that pvdf membrane prepares transparent back panel technology
It is complete mature, phenomena such as glue xanthochromia occurs is easy to during burn-in test.
Summary of the invention
Present invention seek to address that the shortcomings that convention transparent backboard is at high cost, yield is low, weather resistance is poor, xanthochromia, provides one
Kind double-layer structure transparent PET backboard.
In order to overcome defect present in background technique, the technical solution adopted by the present invention to solve the technical problems is:
This double-layer structure transparent PET backboard includes the double-layer PET coextruded structure of air layer and EVA layer,
The air layer material composition, in terms of mass fraction, including following components:
70 ~ 90 parts of PET resin
1 ~ 10 part of compatilizer
0.5 ~ 10 part of polycarbodiimide
Heat stabilizer: 0.2 ~ 1 part
0.1 ~ 0.5 part of ultraviolet absorbing agent
0.1 ~ 1.5 part of UV light stabilizing agent
Other auxiliary agents: 0.5 ~ 1.5 part；
EVA layer, in terms of mass fraction, including following components:
40 ~ 60 parts of PET resin
5 ~ 20 parts of compatilizer
PE resinoid: 10 ~ 40 parts
0.5 ~ 10 part of anti-hydrolysis agent
Heat stabilizer: 0.2 ~ 1 part
0.1 ~ 0.5 part of ultraviolet absorbing agent
0.1 ~ 1.5 part of UV light stabilizing agent
Other auxiliary agents: 0.5 ~ 1.5 part.
It according to another embodiment of the invention, further comprise described 150 ~ 450 μm of PET backboard overall thickness, it is hollow
50 ~ 200 μm of gas pay thickness, 50 ~ 200 μm of EVA layer thickness.
It according to another embodiment of the invention, further comprise the air layer, PET resin used in EVA layer
Relative density is 1.36-1.37, and dynamic viscosity is 0.6-0.8Pa s, molecular weight 8000 ~ 40000.
According to another embodiment of the invention, further comprise PET resin trade mark phase in the air layer and EVA layer
It is same or different.
It according to another embodiment of the invention, further comprise compatilizer in the air layer and EVA layer into split-phase
It is same or different.
According to another embodiment of the invention, further comprise the compatilizer be copolymer compatilizer, structure are as follows:
With carboxyl, ester group, the vinyl monomer of amide based structures and PE copolymer, including but not limited to polycthylene grafted methyl-prop
E pioic acid methyl ester (PE-g-MMA), polycthylene grafted hydroxyethyl methacrylate (PE-g-HEMA), polycthylene grafted acryhic ethyl ester
(PE-g-EA), polycthylene grafted maleimide (PE-g-MI), (Ethylene/vinyl acetate) copolymer (E/VAC), (ethylene/
Acrylic acid) copolymer (EAA)；
Or the functional unit of functional structure containing phenyl ring and PE copolymer, including but not limited to such as: styrene/ethylene/butadiene/benzene
Ethylene) copolymer (SEBS), (styrene/ethylene/propylene) copolymer (S-EP), ethylene propylene diene rubber (EPDM), EP rubbers
(EPR), (polyethylene terephthalate/polyethylene) copolymer (PET-b-PE).
It according to another embodiment of the invention, further comprise that the anti-hydrolysis agent in the EVA layer is carbonized for long-chain is poly-
Diimine class.
It according to another embodiment of the invention, further comprise PE resin used in the EVA layer are as follows: polyethylene tree
Rouge, ingredient are type low density polyethylene resin, low density polyethylene (LDPE), metallocene PE, high density polyethylene (HDPE), ethylene-
One of acetate copolymer or its ethylene and copolymer of other alhpa olefins or at least two kinds combine, and melting point resin 60 ~
135 DEG C, 1 ~ 15g/10min of melt index (MI).
According to another embodiment of the invention, further comprise heat stabilizer used in the air layer and EVA layer
It is phosphorous acid bisphenol-A ester and/or four (2,4- di-tert-butyl-phenyl -4,4 '-xenyls) bis phosphoric acids to commonly use antioxidant in the market
Ester；
Ultraviolet absorbing agent used in the air layer and EVA layer is common ultraviolet absorbing agent；
UV light stabilizing agent used in the air layer and EVA layer is Polymeric hindered amine class light stabilizer；
Other auxiliary agents used in the air layer and EVA layer are that required opening agent, nucleation are processed in transparent PET backboard
Agent, chain extender, dispersing agent, fire retardant.
The processing method of double-layer structure transparent PET backboard includes:
The first step chooses air layer and EVA layer raw material according to weight percent；
The raw material of second step, air layer and EVA layer is mixed and is granulated, and after first sufficiently drying PET resin, is existed with other raw materials
It is uniformly mixed in mixing machine, mixed raw material is made；
The raw material of air layer and EVA layer is mixed and is respectively placed in double screw extruder, through melting extrusion, is granulated；
Third step after sufficiently drying EVA layer, air layer particle, is squeezed out by two screw extruders, in T-shaped mould first melt respectively
Extrusion molding is closed, backboard finished product is made.
The beneficial effects of the present invention are: double-layer structure transparent PET backboard, modified by PE compatilizer and common in the market
Transparent back panel structure is compared, and the program includes
1, use homogeneous PET as weathering layer, the cost of material is low, and weather resistance is good；
2, double-layer structure, without coating and compound working procedure, VOC free discharge produces simple energy conservation, and yield is high；
3, without polyurethane glue, yellowing resistance can be good；
4, pure PET construction, wearability is good, and water vapor rejection rate is high；
5, more environmentally friendly without fluorine structure, it is convenient to recycle；
6, internal layer PE is modified, reduces PET water absorption rate, and insulating properties improves.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is structural schematic diagram of the invention.
Specific embodiment
This double-layer structure transparent PET backboard includes the double-layer PET coextruded structure of air layer and EVA layer, and backboard is bilayer
PET coextruded structure is processed and formed at one time by the double-deck drooling extruder.
As shown in Figure 1, structure can be divided into air layer and EVA layer in transparent PET backboard, air layer and EVA layer add phase
Hold agent and carry out toughening, the improvement of addition PE class polyolefin and EVA bonding force, no longer need to carry out pet sheet face coating processing in EVA layer.
Air layer material is in terms of mass fraction, including following components:
70 ~ 90 parts of PET resin
1 ~ 10 part of compatilizer
0.5 ~ 10 part of polycarbodiimide
Heat stabilizer: 0.2 ~ 1 part
0.1 ~ 0.5 part of ultraviolet absorbing agent
0.1 ~ 1.5 part of UV light stabilizing agent
Other auxiliary agents: 0.5 ~ 1.5 part；
EVA layer, in terms of mass fraction, including following components:
40 ~ 60 parts of PET resin
5 ~ 20 parts of compatilizer
PE resinoid: 10 ~ 40 parts
0.5 ~ 10 part of anti-hydrolysis agent
Heat stabilizer: 0.2 ~ 1 part
0.1 ~ 0.5 part of ultraviolet absorbing agent
0.1 ~ 1.5 part of UV light stabilizing agent
Other auxiliary agents: 0.5 ~ 1.5 part.
150 ~ 450 μm of PET backboard overall thickness, wherein 50 ~ 200 μm of air layer thickness, 50 ~ 200 μm of EVA layer thickness.
The relative density of PET resin used in air layer, EVA layer is 1.36-1.37, dynamic viscosity 0.6-0.8Pa
S, molecular weight 8000 ~ 40000.
The PET resin trade mark in air layer and EVA layer is same or different.
Compatilizer ingredient in air layer and EVA layer is same or different.
Compatilizer is copolymer compatilizer,
With carboxyl, ester group, the vinyl monomer of amide based structures and PE copolymer, including but not limited to polycthylene grafted first
Base methyl acrylate (PE-g-MMA), polycthylene grafted hydroxyethyl methacrylate (PE-g-HEMA), polycthylene grafted acryhic
Ethyl ester (PE-g-EA), polycthylene grafted maleimide (PE-g-MI), (Ethylene/vinyl acetate) copolymer (E/VAC),
(ethylene/acrylic acid) copolymer (EAA)；
Or the functional unit of functional structure containing phenyl ring and PE copolymer, including but not limited to such as: styrene/ethylene/butadiene/benzene
Ethylene) copolymer (SEBS), (styrene/ethylene/propylene) copolymer (S-EP), ethylene propylene diene rubber (EPDM), EP rubbers
(EPR), (polyethylene terephthalate/polyethylene) copolymer (PET-b-PE).
Compatilizer preference
The compatilizer in compatilizer and EVA layer in air layer is all the functional unit of functional structure containing phenyl ring and PE copolymer, such as
Styrene/ethylene/butadiene/styrene) copolymer (SEBS), (styrene/ethylene/propylene) copolymer (S-EP).
Anti-hydrolysis agent in EVA layer is long-chain polycarbodiimide class.
PE resin used in EVA layer are as follows: polyvinyl resin, ingredient is type low density polyethylene resin, low-density is poly-
Ethylene, the copolymerization of metallocene PE, high density polyethylene (HDPE), ethylene-ethyl acetate copolymer or its ethylene and other alhpa olefins
One of object or at least two kinds combinations, 60 ~ 135 DEG C of melting point resin, 1 ~ 15g/10min of melt index (MI).
PE resin preference
LDPE or LLDPE.
Heat stabilizer used in air layer and EVA layer is to commonly use antioxidant in the market, be phosphorous acid bisphenol-A ester and/or
Four (2,4- di-tert-butyl-phenyl -4,4 '-xenyls) biphosphonates；
Ultraviolet absorbing agent used in air layer and EVA layer is common ultraviolet absorbing agent, structure can with benzophenone,
One of benzotriazole or triazines or at least two kinds combinations；
Ultraviolet absorbing agent preference
Triazine-based ultraviolet absorbent and benzotriazole.
UV light stabilizing agent used in air layer and EVA layer is Polymeric hindered amine class light stabilizer；
Other auxiliary agents used in air layer and EVA layer are that required opening agent, nucleating agent, expansion are processed in transparent PET backboard
Chain agent, dispersing agent, fire retardant.
In above-mentioned transparent PET backboard, in the case of no specified otherwise, air layer and EVA layer additive component and content can be with
It is identical, it can also be different.
Preference
Compatilizer in air layer is consistent with the compatilizer in EVA layer, and the compatilizer concentration in air layer is lower than the phase in EVA layer
Hold agent；
To obtain preferable antiageing effect, UV light stabilizing agent and UV absorbers concentration in air layer are higher than EVA layer.
The processing method of double-layer structure transparent PET backboard,
The first step chooses air layer and EVA layer raw material according to weight percent；
The raw material of second step, air layer and EVA layer is mixed and is granulated, and after first sufficiently drying PET resin, is existed with other raw materials
It is uniformly mixed in mixing machine, mixed raw material is made；
The raw material of air layer and EVA layer is mixed and is respectively placed in double screw extruder, through melting extrusion, is granulated；
Third step after sufficiently drying EVA layer, air layer particle, is squeezed out by two screw extruders, in T-shaped mould first melt respectively
Extrusion molding is closed, backboard finished product is made.
Embodiment:
1, air layer PET particle prepares (particle 1)
100 parts of PET resin
15 parts of compatilizer SEBS
4 parts of polycarbodiimide
1,010 0.2 parts of primary antioxidant
168 0.4 parts of auxiliary anti-oxidant
0.3 part of ultra-violet stabilizer UV1577
0.5 part of ultraviolet absorbing agent LA63P
0.2 part of nucleant agent N A05
0.3 part of SiO2
0.3 part of lubricant AX-71
0.2 part of white oil
Wherein the inherent viscosity of PET resin is 0.69, and nucleant agent N A05 is the production of Chinese mugwort Dicon A/S, Japan.
PET resin is dried into 8h or more at 120 DEG C, after removing moisture removal, SEBS and white oil is added, middling speed mixes 3 ~ 5 points
Other powder additives are added in clock, and middling speed mixes 5 ~ 15 minutes, will mix material by melting, mixing in double screw extruder
Refining squeezes out simultaneously water cooling, then pelletizing after drying, and air layer PET is made at 235-265 DEG C in each zone temperature of double screw extruder
Particle (particle 1)；
2. EVA layer PET particle prepares (particle 2)
100 parts of PET resin
20 parts of compatilizer SEBS
40 parts of LDPE resin
4 parts of polycarbodiimide
1,010 0.3 parts of primary antioxidant
168 0.3 parts of auxiliary anti-oxidant
0.3 part of ultraviolet absorbing agent UV1577
0.5 part of ultraviolet light stabilized LA63P
0.2 part of nucleant agent N A05
0.3 part of SiO2
0.3 part of lubricant AX-71
0.2 part of white oil
Wherein the inherent viscosity of PET resin is 0.69, and nucleant agent N A05 is the production of Chinese mugwort Dicon A/S, Japan, the melt of LDPE resin
Index is 5g/10min.
PET resin is dried into 8h or more at 120 DEG C, after removing moisture removal, SEBS, PE resin and white oil is added, middling speed is mixed
It closes 3 ~ 5 minutes, other powder additives is added in mass ratio, middling speed mixes 5 ~ 15 minutes, will mix material by twin-screw
It melted in extruder, be kneaded, squeeze out simultaneously water cooling, then pelletizing after drying, each zone temperature of double screw extruder is in 235-265
DEG C, air layer PET particle (particle 2) is made；
3. preparing transparent PET backboard
By particle 1 and particle 2 be respectively placed in 120 DEG C of baking ovens it is 24 hours dry after, respectively by two single screw extrusion machines 250 ~
It is squeezed out at 270 DEG C, adjusting extruder revolving speed makes internal layer outer layer PET thickness ratio 1:1, after T-die is hot-melted, through chill roll
After cooling, biaxial tension sizing is made transparent back panel finished product, and tests according to GB/T -31034-2014 photovoltaic back national standard,
Test result is as shown in table 1, table 2.
1 transparent PET backboard traditional performance of table tests table
2 transparent PET backboard traditional performance of table tests table
[1] 121 DEG C of PCT test condition, humidity 100%RH, testing time 48h；
[2] the saturating test equipment of infrared method water and condition are as follows: the saturating tester of U.S. film Kang Hongwaifashui, 38 DEG C of test temperature, 90%
RH；
[3] UV test equipment condition are as follows: photovoltaic industry standard ultraviolet testing chamber, ultraviolet spectra distribution meet IEC6121:2005
Relevant regulations, 65 DEG C of test temperature；
[4] UV+DH test equipment and condition: test temperature: 85 DEG C, ambient humidity 85%RH, ultraviolet light intensity and spatial distribution accord with
Close IEC61215:2005 relevant regulations；
[5] 150 DEG C of thermal ageing tests: 150 DEG C of test temperature, 20 times/h of ventilation volume, chest design meets GB/T-11026 correlation
Regulation.
The transparent PET backboard scheme provided in the present invention, relatively traditional backboard multi-layer compound structure have following more
Kind advantage:
1, high durable: PE toughening is used, the water absorption rate of PET is reduced, improves the anti-hydrolytic performance and water vapor barrier property of PET
Energy；It is used in combination simultaneously by ectonexine UV absorbent with light stabilizer, effectively absorbs ultraviolet light, ensure that material property is stablized,
Wearability and yellowing resistance are better than three-layer co-extruded PET in the market；
2, at low cost: backboard simple production process, disposable extrusion molding, yield are high；
3, environmental protection and energy saving:
1. produced by coextrusion mode, avoid that conventional backing plate is compound or coating procedure in organic solvent volatile emission；
2. energy saving: one-pass molding dries solvent without heat；
3. backboard can recycle after photovoltaic module reaches service life；
4. avoiding the waste of strategic resource fluorine, while avoiding pollution of the fluorine to environment.
4, high bonding: by internal layer PE, compatilizer and EVA hot melt adhesion, it ensure that the reliable firmness of material, avoid
Traditional transparent back panel internal layer coating and the weak defect of EVA bonding force.
5, high insulation: internal layer is blended using PE, is reduced water absorption rate, is improved the electrical insulation properties of PET material.
Claims (10)
1. a kind of double-layer structure transparent PET backboard, it is characterised in that: the double-layer PET coextruded structure including air layer and EVA layer,
The air layer material is in terms of mass fraction, including following components:
70 ~ 90 parts of PET resin
1 ~ 10 part of compatilizer
0.5 ~ 10 part of polycarbodiimide
Heat stabilizer: 0.2 ~ 1 part
0.1 ~ 0.5 part of ultraviolet absorbing agent
0.1 ~ 1.5 part of UV light stabilizing agent
Other auxiliary agents: 0.5 ~ 1.5 part；
EVA layer is in terms of mass fraction, including following components:
40 ~ 60 parts of PET resin
5 ~ 20 parts of compatilizer
10 ~ 40 parts of PE resinoid
0.5 ~ 10 part of anti-hydrolysis agent
0.2 ~ 1 part of heat stabilizer
0.1 ~ 0.5 part of ultraviolet absorbing agent
0.1 ~ 1.5 part of UV light stabilizing agent
0.5 ~ 1.5 part of other auxiliary agents.
2. double-layer structure transparent PET backboard as described in claim 1, it is characterised in that: the PET backboard overall thickness 150 ~
450 μm, wherein 50 ~ 200 μm of air layer thickness, 50 ~ 200 μm of EVA layer thickness.
3. double-layer structure transparent PET backboard as described in claim 1, it is characterised in that: used in the air layer, EVA layer
PET resin relative density be 1.36-1.37, dynamic viscosity be 0.6-0.8Pa s, molecular weight 8000 ~ 40000.
4. double-layer structure transparent PET backboard as described in claim 1, it is characterised in that: in the air layer and EVA layer
The PET resin trade mark is same or different.
5. double-layer structure transparent PET backboard as described in claim 1, it is characterised in that: the phase in the air layer and EVA layer
It is same or different to hold agent ingredient.
6. double-layer structure transparent PET backboard as described in claim 1, it is characterised in that: the compatilizer is that copolymer is compatible
Agent has the copolymer of carboxyl, ester group, the vinyl monomer of amide based structures and PE, including but not limited to: polycthylene grafted methyl
Methyl acrylate (PE-g-MMA), polycthylene grafted hydroxyethyl methacrylate (PE-g-HEMA), polycthylene grafted acryhic second
Ester (PE-g-EA), polycthylene grafted maleimide (PE-g-MI), (Ethylene/vinyl acetate) copolymer (E/VAC), (second
Alkene/acrylic acid) copolymer (EAA)；
Or the functional unit of functional structure containing phenyl ring and PE copolymer, including but not limited to such as: styrene/ethylene/butadiene/benzene
Ethylene) copolymer (SEBS), (styrene/ethylene/propylene) copolymer (S-EP), ethylene propylene diene rubber (EPDM), EP rubbers
(EPR), (polyethylene terephthalate/polyethylene) copolymer (PET-b-PE).
7. double-layer structure transparent PET backboard as described in claim 1, it is characterised in that: the anti-hydrolysis agent in the EVA layer is
Long-chain polycarbodiimide class.
8. double-layer structure transparent PET backboard as described in claim 1, it is characterised in that: PE resin used in the EVA layer
Are as follows: polyvinyl resin, ingredient are type low density polyethylene resin, low density polyethylene (LDPE), and metallocene PE, high density are poly-
One of ethylene, ethylene-ethyl acetate copolymer or its ethylene and copolymer of other alhpa olefins or at least two kinds combine,
60 ~ 135 DEG C of melting point resin, 1 ~ 15g/10min of melt index (MI).
9. double-layer structure transparent PET backboard as described in claim 1, it is characterised in that: the institute in the air layer and EVA layer
It is to commonly use antioxidant in the market with heat stabilizer, is phosphorous acid bisphenol-A ester and/or four (2,4- di-tert-butyl-phenyl -4,4 '-connection
Phenyl) biphosphonate；
Ultraviolet absorbing agent used in the air layer and EVA layer is common ultraviolet absorbing agent；
UV light stabilizing agent used in the air layer and EVA layer is Polymeric hindered amine class light stabilizer；
Other auxiliary agents used in the air layer and EVA layer are that required opening agent, nucleation are processed in transparent PET backboard
Agent, chain extender, dispersing agent, fire retardant.
10. the processing method of double-layer structure transparent PET backboard as described in claim 1, it is characterised in that: the processing method packet
It includes:
The first step chooses air layer and EVA layer raw material according to weight percent；
The raw material of second step, air layer and EVA layer is mixed and is granulated, and after first sufficiently drying PET resin, is existed with other raw materials
It is uniformly mixed in mixing machine, mixed raw material is made；
The raw material of air layer and EVA layer is mixed and is respectively placed in double screw extruder, through melting extrusion, is granulated；
4th step after sufficiently drying EVA layer, air layer particle, is squeezed out by two screw extruders, in T-shaped mould first melt respectively
Extrusion molding is closed, backboard finished product is made.
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| CN110667216A (en) * | 2019-09-30 | 2020-01-10 | 常州回天新材料有限公司 | Integrally formed PET co-extrusion transparent back plate |
| CN114106530A (en) * | 2022-01-26 | 2022-03-01 | 广东顺德顺炎新材料股份有限公司 | High CTI value halogen-free flame-retardant reinforced PET modified engineering plastic and preparation method and application thereof |
| CN114701229A (en) * | 2021-12-31 | 2022-07-05 | 浙江中聚材料有限公司 | Solar composite back plate with three-layer structure and preparation method thereof |
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