CN205386970U - Sandwich structure combined material board - Google Patents

Sandwich structure combined material board Download PDF

Info

Publication number
CN205386970U
CN205386970U CN201620049103.1U CN201620049103U CN205386970U CN 205386970 U CN205386970 U CN 205386970U CN 201620049103 U CN201620049103 U CN 201620049103U CN 205386970 U CN205386970 U CN 205386970U
Authority
CN
China
Prior art keywords
layer
composite material
sandwich structure
retardant
fire
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.)
Active
Application number
CN201620049103.1U
Other languages
Chinese (zh)
Inventor
黄险波
陈大华
范欣愉
孙雅杰
黄有平
周虎
秦永利
肖彦
刘玲
金思宇
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.)
GUANGZHOU KINGFA CARBON FIBER NEW MATERIAL DEVELOPMENT Co Ltd
Original Assignee
GUANGZHOU KINGFA CARBON FIBER NEW MATERIAL DEVELOPMENT 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.)
Filing date
Publication date
Application filed by GUANGZHOU KINGFA CARBON FIBER NEW MATERIAL DEVELOPMENT Co Ltd filed Critical GUANGZHOU KINGFA CARBON FIBER NEW MATERIAL DEVELOPMENT Co Ltd
Priority to CN201620049103.1U priority Critical patent/CN205386970U/en
Application granted granted Critical
Publication of CN205386970U publication Critical patent/CN205386970U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Laminated Bodies (AREA)

Abstract

The utility model discloses a sandwich structure combined material board, including the laminboard layer to and respectively with the laminboard layer about surface bonding fire -retardant combined material layer as an organic whole, and respectively with fire -retardant combined material layer about surface bonding sticky dielectric layer as an organic whole, still including respectively with sticky dielectric layer about surface bonding autohension polyvinylidene fluoride thin layer as an organic whole. Sandwich structure combined material board, glue the upper and lower surface of covering in sandwich structure combined material board simultaneously with autohension polyvinylidene fluoride film, make sandwich structure combined material board have splendid ageing resistance, wear -resisting, heat -resisting, corrosion -resistant to have characteristics such as high mechanical strength, high tenacity, high dielectric strength, can be applicable to the open air, in the ultraviolet environment that excels in, because the laminboard layer adopts fire -retardant thermoplastic resin board or fire -retardant one -way preimpregnation piece to retrieve broken material extruded plate, can make sandwich structure combined material board realize subtracting heavy 10wt%~60wt% and reduce cost's purpose simultaneously.

Description

A kind of sandwich structure composite material plate
Technical field
This utility model relates to composite panel field, particularly relates to a kind of sandwich structure composite material plate.
Background technology
Continuous fiber reinforced polypropylene composite material plate has high-strength light, corrosion-resistant, shock resistance, easy-formation because of it, the advantage such as recyclable, it is widely used in transportation, building, energy field, instead of a lot of traditional material, but after there is ageing resistace difference and dose flame-retardant composition in polypropylene material, the problems such as easy xanthochromia, limit its application on more areas.
Patent CN103507348A discloses a kind of flame-proof weather-resisting continuous fiber reinforcement thermoplastic composite board and preparation method thereof, and this composite plate is made up of the first weatherability film, flame-proof composite material layer and the second weatherability film.Described weatherability film is the polyolefin film being added with antioxidant, the steady agent of light or coloring agent, is overlying on flame-proof composite material layer by this thin film.But owing to matrix material is polyolefin, weatherability is poor, anti-ageing function short-term is effective, also can there is the problem such as xanthochromia, air slaking at life-time service, use still limited in high-strength ultraviolet environment.Although the product structure of this patent avoids the reaction failure phenomenon between fire retardant and antioxidant, but due to composition non-antiflaming in weatherability film, causes that flame retarding efficiency reduces.
Patent CN204431858U discloses a kind of anti-flammability lining of railway boxcar plate, and this interior lining panel has flame-retardant layer, upper and lower epidermis, and fire-retardant central layer forms.The main material of described flame-retardant layer is PVC material, this PVC film is overlying on upper and lower surface, plays fire-retardant and certain aging resistance effect.But PVC material is all toxic to the mankind and environment.
Utility model content
For solving the problems referred to above, this utility model aims to provide a kind of high-strength light, has aging resistance concurrently and the sandwich structure composite material plate of fire-retardant dual-use function.
A kind of sandwich structure composite material plate described in the utility model, including laminboard layer, and the flame-proof composite material layer of one it is bonded as respectively with laminboard layer upper and lower surface, and adhesive media layer integrally it is bonded as respectively with flame-proof composite material layer upper and lower surface, also include the self-adhesive polyvinylidene fluoride thin film layer being bonded as one respectively with adhesive media layer upper and lower surface.
Sandwich structure composite material plate described in the utility model, self-adhesive polyvinylidene fluoride thin film is covered simultaneously in the upper and lower surface of sandwich structure composite material plate, sandwich structure composite material plate is made to have splendid ageing resistance, wear-resisting, heat-resisting, corrosion-resistant, and there is the features such as high mechanical properties, high tenacity, high dielectric strength, it is possible to suitable in open air, high-strength ultraviolet environment;Simultaneously because laminboard layer adopts fire-retardant thermoplastic resin plate or fire-retardant unidirectional preliminary-dip piece to reclaim broken material extrusion board, compare with the full sheet material composite panel of same thickness, it is possible to make sandwich structure composite material plate realize loss of weight 10wt% ~ 60wt% and reduce the purpose of cost;It addition, the upper and lower surface at laminboard layer has covered flame-proof composite material layer simultaneously, there is aging resistance and fire-retardant feature;Additionally, the upper and lower surface at flame-proof composite material layer has covered adhesive media layer simultaneously, it is possible to improve the peel strength between self-adhesive polyvinylidene fluoride thin film layer and flame-proof composite material layer.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Wherein: 1-laminboard layer;2-flame-proof composite material layer;3-adhesive media layer;4-self-adhesive polyvinylidene fluoride thin film layer.
Detailed description of the invention
Further illustrating this utility model below by detailed description of the invention, following example are this utility model preferably embodiment, but embodiment of the present utility model is not by the restriction of following embodiment.
A kind of sandwich structure composite material plate, as shown in Figure 1, including laminboard layer 1, and the flame-proof composite material layer 2 of one it is bonded as respectively with laminboard layer 1 upper and lower surface, and adhesive media layer 3 integrally it is bonded as respectively with flame-proof composite material layer 2 upper and lower surface, also include the self-adhesive polyvinylidene fluoride thin film layer 4 being bonded as one respectively with adhesive media layer 3 upper and lower surface.
Wherein, described self-adhesive polyvinylidene fluoride thin film layer 4 includes the polyvinylidene fluoride layer and the glued membrane that connect as one, and thickness is 0.15mm ~ 0.8mm.Too thick cost is high, crosses thin aging resistance function and is deteriorated, and not easily film forming, processing cost is high.
Wherein, described adhesive film is ethylene-vinyl acetate copolymer EVA, polyolefin elastomer or thermoplastic polyurethane TPU.These several adhesive films are prone to postorder processing, and temperature is close with the processing temperature of polyolefin panels product.
Wherein, described adhesive media layer 3 is selected from glass mat and/or non-woven fabrics, and surface density is 30g/m2~300g/m2;Described non-woven fabrics is spun-laced nonwoven fabric, needle punched non-woven fabrics or spun-bonded non-woven fabrics;The material of described non-woven fabrics is PET, PA or viscose fiber.The surface density of adhesive media layer 3 is too small, and adhesive strength is low;Adhesive media aspect density is excessive, no matter is glass mat or non-woven fabrics, and interlayer performance all can be deteriorated.
Wherein, described flame-proof composite material layer 2 is made up of 2 layers ~ 4 layers fire-retardant unidirectional preliminary-dip piece;The ply stacking angle of described fire-retardant unidirectional preliminary-dip piece is [90 °/0 °]TOr [0 °/90 °]T、[90°/0°/90°]TOr [0 °/90 °/0 °]T、[90°/0°]2TOr [0 °/90 °]2T、[90°/0°]2sOr [0 °/90 °]2s;Carry out symmetric layups, anti-buckling deformation.
Wherein, described fire-retardant unidirectional preliminary-dip piece is continuous fiber reinforced thermoplastic resin composite material sheet material, and thickness is 0.2mm ~ 1mm, and surface density is 200g/m2~2000g/m2;Described continuous fiber reinforced thermoplastic resin composite material sheet material is made up of continuous fiber and fire-retardant thermoplastic resin;Based on the gross weight of continuous fiber reinforced thermoplastic resin composite material sheet material, continuous fiber percentage by weight is 40wt% ~ 80wt%;Described continuous fiber is alkali-free glass fibre, medium-alkali glass fibre, high alkali glass fibre, carbon fiber, aramid fiber, basalt fibre or silicon carbide fibre, and continuous fiber diameter is 5 μm ~ 20 μm;Described fire-retardant thermoplastic resin is made up of 12wt% ~ 20wt% fire retardant and 80wt% ~ 88wt% thermoplastic resin, and described fire retardant is selected from halogen-free flame retardants and/or bromide fire retardant;Preferably without halogen fire retardant.Wherein, described halogen-free flame retardants is selected from organic phosphorus flame retardants such as Phos flame retardant, phosphite ester, phosphate ester, heterocyclic such as the magnalium fire retardant such as magnesium hydroxide, aluminium hydroxide, disodium hydrogen phosphate, lithium phosphate, sodium phosphate, diammonium phosphate, phosphoric acid antimony, APPs (APP);Nitrogenated flame retardant, the IFR-CFA(IFR such as tripolycyanamide, melamine cyanurate (MCA) they are a kind of complex intumescent flame retardant being main component with nitrogen phosphorus, and CFA is into charcoal foaming agent) one or more in halogen-free expansible composite flame-retardant agent;Described bromide fire retardant in bromination imines, brominated polycarbonate, brominated Polystyrene, brominated polystyrene, brominated epoxy, brominated triazine, tetrabromobisphenol A, eight bromo ether, eight bromine S ethers, deca-BDE, the TDE one or more;One or more in polyethylene, polypropylene, polyethylene reclaimed materials, the polypropylene reclaimed material of described thermoplastic resin with arbitrarily than combination.
Wherein, described laminboard layer 1 is fire-retardant thermoplastic resin plate or fire-retardant unidirectional preliminary-dip piece recovery broken material extrusion board, and thickness is 1mm ~ 2mm.
Embodiment 1
As shown in Figure 1, a kind of sandwich structure composite material plate, including laminboard layer 1, and the flame-proof composite material layer 2 of one it is bonded as respectively with laminboard layer 1 upper and lower surface, and adhesive media layer 3 integrally it is bonded as respectively with flame-proof composite material layer 2 upper and lower surface, also include the self-adhesive polyvinylidene fluoride thin film layer 4 being bonded as one respectively with adhesive media layer 3 upper and lower surface;Described laminboard layer 1 is the polypropylene flame redardant plate that thickness is 1mm, and described polypropylene flame redardant plate is made up of 9wt%APP101 and 3wt%IFR-CFA halogen-free expansible composite flame-retardant agent and 88wt% acrylic resin;Described flame-proof composite material layer 2 is by 3 layers, according to [0 °/90 °/0 °]TThe fire-retardant unidirectional preliminary-dip piece composition of laying, the thickness of described fire-retardant unidirectional preliminary-dip piece is 0.3mm, and surface density is 450g/m2, by continuous alkali-free glass fibre through melted flame retardant resin systems, abundant preimpregnation, the continuous glass fiber reinforced polypropylene composite material sheet material that cooling is made;Based on the gross weight of continuous alkali-free glass fibre reinforced polypropylene compound material sheet material, continuous alkali-free glass fibre percentage by weight is 50wt%, and the diameter of continuous alkali-free glass fibre is 17 μm;Based on the gross weight of continuous alkali-free glass fibre reinforced polypropylene compound material sheet material, halogen-free flame retardants APP101 and IFR-CFA percentage by weight respectively 12wt% and 3wt%;Described adhesive media layer 3 is 50g/m for surface density2Spun lacing PET non-woven fabrics;The thickness of described self-adhesive polyvinylidene fluoride thin film layer 4 is 0.3mm, adopts the thin film including polyvinylidene fluoride layer and adhesive film prepared by multi-layer co-extruded technique, and described adhesive film is ethylene-vinyl acetate copolymer EVA;Above-mentioned laminboard layer 1, the flame-proof composite material layer 2 of laminboard layer 1 upper and lower surface, the adhesive media layer 3 of flame-proof composite material layer 2 upper and lower surface, adhesive media layer 3 upper and lower surface self-adhesive polyvinylidene fluoride thin film layer 4 in order, and with laminboard layer for benchmark, after symmetric layups, it is placed in press, sequentially pass through hot pressing, cold pressing, cut, obtain the sandwich structure composite material plate that thickness is 3mm;Wherein hot pressing temperature is 180 DEG C ~ 250 DEG C, and hot pressing pressure is 1MPa ~ 5MPa, and hot pressing time is 2min ~ 10min;Temperature of colding pressing is 20 DEG C ~ 30 DEG C, and pressure of colding pressing is 2MPa ~ 10MPa, and cold pressing time 2min ~ 10min.The sandwich structure composite material plate that the thickness obtained is 3mm is as shown in table 1 through ageing properties test result.
Embodiment 2
As shown in Figure 1, a kind of sandwich structure composite material plate, including laminboard layer 1, and the flame-proof composite material layer 2 of one it is bonded as respectively with laminboard layer upper and lower surface, and adhesive media layer 3 integrally it is bonded as respectively with flame-proof composite material layer upper and lower surface, also include the self-adhesive polyvinylidene fluoride thin film layer 4 being bonded as one respectively with adhesive media layer upper and lower surface;Described laminboard layer 1 reclaims broken material extrusion board for the fire-retardant unidirectional preliminary-dip piece that thickness is 1.8mm, and this broken material extrusion board is made up of 4.8wt%APP101 and 1.2wt%IFR-CFA halogen-free flame retardants and 34wt% acrylic resin and 60wt% alkali-free glass fibre;Described flame-proof composite material layer 2 is by 2 layers, according to [0 °/90 °]TThe fire-retardant unidirectional preliminary-dip piece composition of laying, described fire-retardant unidirectional preliminary-dip piece thickness is 0.3mm, and surface density is 480g/m2, by continuous alkali-free glass fibre through melted flame retardant resin systems, abundant preimpregnation, the continuous glass fiber reinforced polypropylene composite material sheet material that cooling is made.Based on the gross weight of continuous alkali-free glass fibre reinforced polypropylene compound material sheet material, continuous alkali-free glass fibre percentage by weight is 60wt%, and the diameter of continuous alkali-free glass fibre is 15 μm;Based on the gross weight of continuous alkali-free glass fibre reinforced polypropylene compound material sheet material, halogen-free flame retardants APP101 and IFR-CFA percentage by weight respectively 12wt% and 3wt%;Described adhesive media layer 3 is 80g/m for surface density2Glass mat;The thickness of described self-adhesive polyvinylidene fluoride thin film layer 4 is 0.2mm, adopts the thin film including polyvinylidene fluoride layer and adhesive film prepared by multi-layer co-extruded technique, and described adhesive film is polyolefin elastomer;Above-mentioned laminboard layer 1, the flame-proof composite material layer 2 of laminboard layer 1 upper and lower surface, the adhesive media layer 3 of flame-proof composite material layer 2 upper and lower surface, adhesive media layer 3 upper and lower surface self-adhesive polyvinylidene fluoride thin film layer 4 in order, and with laminboard layer for benchmark, after symmetric layups, it is placed in press, sequentially pass through hot pressing, cold pressing, cut, obtain the sandwich structure composite material plate that thickness is 3mm;Wherein hot pressing temperature is 180 DEG C ~ 250 DEG C, and hot pressing pressure is 1MPa ~ 5MPa, and hot pressing time is 2min ~ 10min;Temperature of colding pressing is 20 DEG C ~ 30 DEG C, and pressure of colding pressing is 2MPa ~ 10MPa, and cold pressing time 2min ~ 10min.The sandwich structure composite material plate that the thickness obtained is 3mm is as shown in table 1 through ageing properties test result.
Embodiment 3
Described laminboard layer 1 reclaims broken material extrusion board for the fire-retardant unidirectional preliminary-dip piece that thickness is 1.5mm;This broken material extrusion board is made up of 4.8wt%APP101 and 1.2wt%IFR-CFA halogen-free flame retardants and 34wt% acrylic resin and 60wt% alkali-free glass fibre;Described flame-proof composite material layer 2 is by 4 layers, according to [90 °/0 °]2sThe fire-retardant unidirectional preliminary-dip piece composition of laying, thickness is 0.2mm, and surface density is 320g/m2For continuous alkali-free glass fibre RPP reclaimed materials composite material sheet, based on the gross weight of continuous alkali-free glass fibre RPP reclaimed materials composite material sheet, continuous alkali-free glass fibre percentage by weight is 60wt%, and described adhesive media layer 3 is 40g/m for surface density2Acupuncture PA non-woven fabrics;The thickness of described self-adhesive polyvinylidene fluoride thin film layer 4 is 0.15mm;The other the same as in Example 1.The sandwich structure composite material plate that the thickness obtained is 3mm is as shown in table 1 through ageing properties test result.
The sandwich structure composite material plate of table 1 embodiment 1 ~ 3 is through ageing properties test result

Claims (7)

1. a sandwich structure composite material plate, including laminboard layer (1), and the flame-proof composite material layer (2) of one it is bonded as respectively with laminboard layer (1) upper and lower surface, and the adhesive media layer (3) of one it is bonded as respectively with flame-proof composite material layer (2) upper and lower surface, it is characterized in that, also include the self-adhesive polyvinylidene fluoride thin film layer (4) being bonded as one respectively with adhesive media layer (3) upper and lower surface.
2. sandwich structure composite material plate according to claim 1, it is characterised in that described self-adhesive polyvinylidene fluoride thin film layer (4) includes the polyvinylidene fluoride layer and the adhesive film that connect as one, thickness is 0.15mm ~ 0.8mm.
3. sandwich structure composite material plate according to claim 2, it is characterised in that described adhesive film is ethylene-vinyl acetate copolymer EVA, polyolefin elastomer or thermoplastic polyurethane TPU.
4. sandwich structure composite material plate according to claim 1, it is characterised in that described adhesive media layer (3) is glass mat and/or non-woven fabrics, and surface density is 30g/m2~300g/m2;Described non-woven fabrics is spun-laced nonwoven fabric, needle punched non-woven fabrics or spun-bonded non-woven fabrics;The material of described non-woven fabrics is PET, PA or viscose fiber.
5. sandwich structure composite material plate according to claim 1, it is characterised in that described flame-proof composite material layer (2) is made up of 2 layers ~ 4 layers fire-retardant unidirectional preliminary-dip piece;The ply stacking angle of described fire-retardant unidirectional preliminary-dip piece is [90 °/0 °]TOr [0 °/90 °]T、[90°/0°/90°]TOr [0 °/90 °/0 °]T、[90°/0°]2TOr [0 °/90 °]2T、[90°/0°]2sOr [0 °/90 °]2s
6. sandwich structure composite material plate according to claim 5, it is characterised in that described fire-retardant unidirectional preliminary-dip piece is continuous fiber reinforced thermoplastic resin composite material sheet material, and thickness is 0.2mm ~ 1mm, and surface density is 200g/m2~2000g/m2;Described continuous fiber is alkali-free glass fibre, medium-alkali glass fibre, high alkali glass fibre, carbon fiber, aramid fiber, basalt fibre or silicon carbide fibre;Described thermoplastic resin is polyethylene, polypropylene, polyethylene reclaimed materials or polypropylene reclaimed material.
7. the sandwich structure composite material plate according to claim 1 or 6, it is characterised in that described laminboard layer (1) reclaims broken material extrusion board for fire-retardant thermoplastic resin plate or fire-retardant unidirectional preliminary-dip piece, and thickness is 1mm ~ 2mm.
CN201620049103.1U 2016-01-19 2016-01-19 Sandwich structure combined material board Active CN205386970U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620049103.1U CN205386970U (en) 2016-01-19 2016-01-19 Sandwich structure combined material board

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620049103.1U CN205386970U (en) 2016-01-19 2016-01-19 Sandwich structure combined material board

Publications (1)

Publication Number Publication Date
CN205386970U true CN205386970U (en) 2016-07-20

Family

ID=56382274

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201620049103.1U Active CN205386970U (en) 2016-01-19 2016-01-19 Sandwich structure combined material board

Country Status (1)

Country Link
CN (1) CN205386970U (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018006450A1 (en) * 2016-07-04 2018-01-11 广州金发碳纤维新材料发展有限公司 Composite material plate and preparation method therefor
CN109177352A (en) * 2018-07-10 2019-01-11 嘉兴领科材料技术有限公司 A kind of high-strength thermoplasticity light composite board and preparation method thereof
CN112549679A (en) * 2020-12-23 2021-03-26 广州金发碳纤维新材料发展有限公司 Thermoplastic composite board
CN113665104A (en) * 2021-08-02 2021-11-19 华东理工大学 Selective laser sintering forming process of nanoparticle synergistic macromolecular expansion flame-retardant TPU (thermoplastic polyurethane) workpiece

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018006450A1 (en) * 2016-07-04 2018-01-11 广州金发碳纤维新材料发展有限公司 Composite material plate and preparation method therefor
CN109177352A (en) * 2018-07-10 2019-01-11 嘉兴领科材料技术有限公司 A kind of high-strength thermoplasticity light composite board and preparation method thereof
CN112549679A (en) * 2020-12-23 2021-03-26 广州金发碳纤维新材料发展有限公司 Thermoplastic composite board
CN113665104A (en) * 2021-08-02 2021-11-19 华东理工大学 Selective laser sintering forming process of nanoparticle synergistic macromolecular expansion flame-retardant TPU (thermoplastic polyurethane) workpiece

Similar Documents

Publication Publication Date Title
CN205386970U (en) Sandwich structure combined material board
CN205467724U (en) Composite plate
CN104842619B (en) High tenacity sandwich construction prepreg manufacturing process
KR101436159B1 (en) Fiber reinforced thermoplastic sheets with surface coverings
CN108022989B (en) Double-sided glass photovoltaic building material component and preparation method thereof
CN105818471B (en) A kind of continuous fiber reinforced thermoplastic resin composite sheet and its application
US7446064B2 (en) Impact resistant building panels
CN103507348A (en) Flame-retardant and weather-resistant continuous fiber reinforced thermoplastic composite plate and preparation method thereof
CN210110803U (en) Light backboard for photovoltaic module and light photovoltaic module applying light backboard
CN202831273U (en) Anti-flaming type heat preservation board
US20130260078A1 (en) Core material for a vacuum insulation panel formed of a phenolic resin-cured foam and vacuum insulation panel using same, and method for manufacturing same
WO2011052836A1 (en) Production method for a hot-melt film recycling air-bag scraps for shoes, and a hot-melt film produced using the method
CN102738280A (en) Solar cell back membrane
CN218548444U (en) Light fireproof photovoltaic module and photovoltaic power generation system
CN111775531A (en) Multilayer extrusion type transparent solar photovoltaic back plate
CN104369491A (en) PA/VMPET/Al/PE membrane material and preparation method thereof
CN114407479B (en) Flexible fireproof and explosion-proof plate and preparation method thereof
CN103707583A (en) Reinforced polypropylene composite board and production method thereof
CN115674847A (en) Production process of hot-pressing flame-retardant aerogel heat-insulating plate
US5418050A (en) Fire/heat barrier laminates
CN115954403A (en) Packaging backboard for photovoltaic module and photovoltaic module
CN216373659U (en) PVC film with good flame resistance
CN213167269U (en) Multilayer extrusion type transparent solar photovoltaic back plate
CN108611007A (en) A kind of polyvinyl fluoride weather-resistant glue band
WO2013107098A1 (en) High-barrier composite film for vacuum thermal insulation panel and manufacturing method therefor

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant