CN102582092B - Vacuum infusion molding method for thick-size carbon fiber product - Google Patents
Vacuum infusion molding method for thick-size carbon fiber product Download PDFInfo
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- CN102582092B CN102582092B CN201210054977.2A CN201210054977A CN102582092B CN 102582092 B CN102582092 B CN 102582092B CN 201210054977 A CN201210054977 A CN 201210054977A CN 102582092 B CN102582092 B CN 102582092B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 52
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000000465 moulding Methods 0.000 title claims abstract description 36
- 238000009755 vacuum infusion Methods 0.000 title claims abstract description 26
- 239000003292 glue Substances 0.000 claims abstract description 29
- 230000010412 perfusion Effects 0.000 claims description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 25
- 229910052799 carbon Inorganic materials 0.000 claims description 25
- 239000004744 fabric Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000010409 thin film Substances 0.000 abstract 2
- 229920000742 Cotton Polymers 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 239000002131 composite material Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 230000037452 priming Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 210000002615 epidermis Anatomy 0.000 description 2
- 238000005429 filling process Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Abstract
The invention relates to a vacuum infusion molding method for a thick-size carbon fiber product, which comprises the following steps of: adopting vacuum infusion molding and manufacturing the large-size and thick-carbon fiber product by utilizing a vacuum infusion process; paving a rigid porous plate on a carbon fiber product mold; paving glue suction cotton on the upper surface of the porous plate and sealing the lower part of a vacuum suction nozzle by using a VAP thin film; and controlling the negative gradient of a filling body by using the VAP thin film and vacuum-pumping the carbon fiber product module so as to finish the vacuum infusion molding.
Description
Technical field
The present invention relates to a kind of preparation method of composite, refer in particular to a kind of thick size carbon fiber composite vacuum perfusion molding method, is technical field of composite material molding, is mainly used in thick size carbon fiber composite vacuum perfusion molding process.
Technical background
Carbon fibre composite is widely used in each fields such as space flight, aviation, wind electricity blade with its high specific strength and high ratio modulus, and thick size carbon fiber composite material element can alleviate product weight greatly as structure member.
Vacuum perfusion process is as the topmost moulding process of composite, quick with its moulding, pollutes low and is applicable to prepare the advantages such as large component and was widely studied and applied in recent years.When vacuum infusion molding, mainly use glass fibre to carry out the form of bottling body, glass fiber single filament diameter is between 18-25 μ m, in the corpus fibrosum of piling up after vacuum debulk, have larger space, such space, as same flow guide system, is conducive to the mobile perfusion of glue; Tradition method for filling makes glue flow on flow-guiding screen along injected rubber hose direction by flow-guiding screen, then in mobile process, carry out again longtitudinal dispersion, and this kind of inapplicable carbon fiber perfusion of method, because carbon fiber filament diameter is at 6-8 μ m, after vacuum debulk carbon fibrous body, system internal pore is much smaller than fiber glass body, such condition still can be carried out carrying out thin plate perfusion smallclothes, can not realize vacuum perfusion process if carry out large product slab perfusion.Be used for the gelatin viscosity of priming by vacuum generally at 160mPa.s-300mPa.s, the carbon fiber sheet that uses the runner that generally uses at present and laying design to be less than 10mm at perfusion thickness can be realized little product perfusion, if but the carbon fibre composite perfusion of using the large-sized structural component of thick size is just difficult to realize vacuum perfusion process moulding.
At present carbon fiber is as in the production of large-sized structural component or hot setting moulding under vacuum systems after using carbon fiber pieces of cloth laying with prepreg complete, its solidification temperature is generally more than 110 DEG C, because carbon fiber prepreg needs low-temperature transport and low temperature storage, and the production cost of prepreg also will be attached in material cost, higher solidification temperature all can be brought impact to mould and energy consumption, so carbon fiber prepreg uses more separately the price of carbon fiber and glue moulding to want high, also can there is the waste material wastes such as leftover pieces in prepreg in use, using like this prepreg to produce product can bring the production cost of product high.On moulding process, prepreg is owing to being the film with viscosity higher, after laying because so film can not absolutely be pasted product and can have certain hole and the phenomenon of local delamination, can bring impact to the mechanical property of product and reliability like this, therefore necessary this be improved.
Summary of the invention
The object of the invention is to for the problems referred to above, propose a kind of pouring and molding method that is applicable to the large product carbon fibrous body of thick size vacuum infusion molding.This forming method neither can bring impact to the mechanical property of product and reliability, and can reduce the consumptive material of material.
The technical scheme that the present invention takes is:
A kind of thick size carbon fiber product vacuum infusion molding method, adopts vacuum infusion molding, utilizes vacuum perfusion process to make large scale, thick carbon fiber product; On carbon fiber part forming die, lay rigidity porous flat plate; Lay and inhale collodion at porous flat plate upper surface again, and under vacuum slot, use VAP film to seal, by using the suction gradient of VAP film control bottling body, carbon fiber part forming die is vacuumized, thereby complete vacuum infusion molding.
Further, described vacuum perfusion process is below carbon fiber laying, to lay flow-guiding screen and release cloth, by being laid on the flow-guiding screen of corpus fibrosum bottom, glue is passed through after flow-guiding screen rapid dispersion, then along vertical laying direction glue rapid osmotic from the bottom to top; Because so carbon fiber is non axial cannot stressed woven cloth very loose, in the time carrying out vacuum suction, carbon fiber laying can be made to form in the axial direction deep mixed fold by vacuum bag extruding, therefore the present invention is by using rigidity porous flat plate to be laid on carbon fiber laying upper surface, ensures that carbon fibrous body is not extruded distortion and ensures the flatness of upper surface under vacuum pressure.And seal vacuum slot with VAP film and ensure that glue is not drawn in vacuum tube infiltrating after upper surface, finally reaches whole carbon fibrous body form; VAP film has the ventilative not function of seep through, this material price is expensive and be disposable consumptive material, traditional use VAP film seals vacuum to whole perfusion part and can make VAP film use in a large number, by the consumption that is used in conjunction with this and greatly reduces VAP film of VAP film and vacuum slot.The present invention seals vacuum slot with VAP film and ensures that glue is not drawn in vacuum tube after infiltration upper surface, finally reaches whole carbon fibrous body form.The described suction collodion using between rigidity porous flat plate and VAP film is mainly to provide the continuous zone of negaive pressure at bottling body upper surface, avoids reducing after being close to because of vacuum bag film and rigidity porous flat plate the vacuum of upper epidermis.
Described flow-guiding screen undersized is in carbon fiber laying, and flow-guiding screen is apart from carbon fibrous body edge 20mm-40mm, and described release cloth is for sloughing the flow-guiding screen after solidifying; Rigidity porous media is laid on carbon fibrous body top, described rigidity porous media is for ensureing the flatness of carbon fibrous body upper surface, on rigidity porous media, lay and inhale collodion, after vacuumizing, inhale collodion and can ensure the vacuum of upper surface, being used in conjunction with of VAP film and vacuum slot ensures that glue is not drawn in vacuum tube penetrating into after upper surface.In this laying, lay vacuum bag film, described vacuum bag film is for providing the vacuum of whole perfusion system.
The invention has the advantages that: product is owing to adopting vacuum infusion molding, and product is homogeneous, at the bubble of eliminating to greatest extent in product, has ensured the quality of product.The vacuum infusion molding that the present invention makes full use of carbon fiber can, 70 DEG C of curing features, adopt the mode of vacuum glue perfusion, can pour into according to the size of bottling body, there will not be unnecessary waste, and cost of manufacture is lower; Priming by vacuum can ensure the porosity that goods are minimum in addition, can greatly improve like this product properties, has realized carbon fiber and has adopted priming by vacuum, is suitable for very much the carbon fiber product of large scale, thick product.The present invention can realize the vacuum infusion molding of large scale, thick product carbon fibrous body, in filling process, glue flows evenly, after perfusion, corpus fibrosum glue content can be controlled at 28%-32%, because glue is to infiltrate from the bottom to top corpus fibrosum to ensure in filling process to realize the supervision to whole perfusion part, whether described supervision method can observe carbon fiber and infiltrated by glue by rigidity porous flat plate being opened to the square osculum of several 20mm at diverse location.The carbon fibrous body maximum ga(u)ge of priming by vacuum can reach 70mm, almost can realize the form of all carbon fiber composite structure parts goods.Form has the advantages such as the high and product cost of low porosity, low solidification temperature, product mechanical performance is low compared with carbon fiber prepreg moulding process.
Brief description of the drawings
Fig. 1 is thick size carbon fiber product vacuum infusion molding process for compound water conservancy diversion schematic diagram in embodiment;
Fig. 2 is thick size carbon fiber product vacuum infusion molding process for compound water conservancy diversion diagrammatic top view in embodiment;
Fig. 3 is rigidity porous flat plate schematic diagram in the embodiment of the present invention;
Fig. 4 is vacuum slot schematic diagram in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described, apparently, embodiment in the following describes and accompanying drawing are only part examples of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing and embodiment.
Can find out by accompanying drawing the thick size carbon fiber product vacuum infusion molding method in one that the present invention relates to, adopt vacuum infusion molding, utilize vacuum perfusion process to make large scale, thick carbon fiber product; On carbon fiber part forming die, lay rigidity porous flat plate; Lay and inhale collodion at porous flat plate upper surface again, and under vacuum slot, use VAP film to seal, by using the suction gradient of VAP film control bottling body, carbon fiber part forming die is vacuumized, thereby complete vacuum infusion molding.
Further, described vacuum perfusion process is, below carbon fiber laying, lay flow-guiding screen and release cloth, by being laid on the flow-guiding screen of corpus fibrosum bottom, glue is passed through after flow-guiding screen rapid dispersion, then along vertical laying direction glue rapid osmotic from the bottom to top; Because so carbon fiber is non axial cannot stressed woven cloth very loose, in the time carrying out vacuum suction, carbon fiber laying can be made to form in the axial direction deep mixed fold by vacuum bag extruding, therefore the present invention is by using rigidity porous flat plate to be laid on carbon fiber laying upper surface, under vacuum pressure, ensure that carbon fibrous body is not extruded distortion, ensures the flatness of upper surface.And seal vacuum slot with VAP film and ensure that glue is not drawn in vacuum tube infiltrating after upper surface, finally reaches whole carbon fibrous body form; VAP film has the ventilative not function of seep through, this material price is expensive and be disposable consumptive material, traditional use VAP film seals vacuum to whole perfusion part and can make VAP film use in a large number, by the consumption that is used in conjunction with this and greatly reduces VAP film of VAP film and vacuum slot.The present invention seals vacuum slot with VAP film and ensures that glue is not drawn in vacuum tube after infiltration upper surface, finally reaches whole carbon fibrous body form.The described suction collodion using between rigidity porous flat plate and VAP film is mainly to provide the continuous zone of negaive pressure at bottling body upper surface, avoids reducing after being close to because of vacuum bag film and rigidity porous flat plate the vacuum of upper epidermis.
Described flow-guiding screen is arranged in the bottom of carbon fiber laying, the glue of injected rubber hose is guided to glue the bottom of fiber laying fast by flow-guiding screen, require the thickness of flow-guiding screen to be not less than 2mm, can meet the demands by increasing the flow-guiding screen number of plies if water conservancy diversion thickness does not meet the demands.Described flow-guiding screen undersized is in carbon fiber laying, and flow-guiding screen is apart from carbon fibrous body edge 20mm-40mm, and described release cloth is for sloughing the flow-guiding screen after solidifying; Rigidity porous media is laid on carbon fibrous body top, described rigidity porous media is for ensureing the flatness of carbon fibrous body upper surface, on rigidity porous media, lay and inhale collodion, after vacuumizing, inhale collodion and can ensure the vacuum of upper surface, being used in conjunction with of VAP film and vacuum slot ensures that glue is not drawn in vacuum tube penetrating into after upper surface.In this laying, lay vacuum bag film, described vacuum bag film is for providing the vacuum of whole perfusion system.
Described carbon fiber knit is loose, and while vacuumizing, upper surface can form the fold along machine direction, and its rigidity porous flat plate is laid on the flatness of carbon fibrous body upper surface by atmospheric pressure guarantee carbon fiber upper surface, makes product upper surface smooth.Described rigidity porous flat plate is the rigid materials such as aluminium alloy, steel plate, and aperture is at 2mm-4mm, and hole density is at 15mm-25mm.
Described rigidity porous flat plate needs to use in releasing agent effects on surface and aperture before use to be processed, and needs the glue-line of rigidity porous flat plate to remove after use, reuses to facilitate.
The suction collodion of described rigidity porous media upper surface forms the continuous zone of negaive pressure one at perfusion part upper surface also can be mainly used in providing carbon fiber perfusion for flow-guiding screen time.
Being used in conjunction with of described VAP film and vacuum slot; VAP film is expensive, and the present invention is used in conjunction with to greatly reduce by VAP film with VAP film and vacuum slot provides negative pressure protection to perfusion part envelope vacuum.
Described negative pressure provides for vavuum pump, and negative pressure requires to reach in plains region-more than 0.09MPa pour into, and the requirement of highlands after according to every hundred meters of Pressure Drops controlled.
The present invention is that runner lay improves in traditional vacuum pouring and forming process, make glue not to be taken away in the process of bleeding by the advantage of this film of VAP film, simultaneously according to the direction of arranging that VAP film can controlled pressure gradient, and then control the flow direction of glue in the time carrying out priming by vacuum.
Embodiment:
The expensive large area use of VAP film value can cause product cost to rise, by being lowered into product cost with being used in conjunction with of vacuum slot.The present embodiment is the carbon fibrous body form example at 50mm to the wide 0.5m maximum ga(u)ge of long 58m.
Below in conjunction with accompanying drawing, the present invention is described further:
Runner general layout method as shown in Figure 1, laying method is: flow-guiding screen 9 is laid on to perfusion mould 1 surface, and flow-guiding screen 9 is slightly less than bottling body 6, apart from bottling body 6 inward flange 20mm-70mm, on flow-guiding screen 9, cover release cloth 7, on release cloth 7, lay on request carbon cloth, bottling body 6 is poured on carbon cloth, and bottling body 6 outer surfaces are laid release cloth 5, injected rubber hose 8 is located at the side of flow-guiding screen 9, and pours into toward bottling body 6 by flow-guiding screen 9, lay rigidity porous flat plate 4 at release cloth 5 upper surfaces, rigidity porous flat plate 4 areas are slightly less than release cloth 5 top surface edge 20mm-30mm, on rigidity porous flat plate 4, be equipped with and inhale collodion or vacuumize flow-guiding screen 11 for providing negative pressure of vacuum layer to bottling body upper surface, inhale collodion or vacuumizing flow-guiding screen 11 upper surfaces placement vacuum slots 2, the bottom of vacuum slot 2 is used VAP film 10 to seal, glue and vaccum suction pipe are intercepted vacuumizing while being whole bottling body in perfusion VAP film after glue penetrates into upper surface from the bottom to top like this, ensure the perfusion of carbon fiber bottling body.
Accompanying drawing 2 is vacuum infusion molding process for compound water conservancy diversion diagrammatic top view, on the flow-guiding screen 9 of exposed fiber laying, be provided with and prevent anti-injected rubber hose 12, be provided with and prevent winding pipe 13 in other 3 directions of bottling body, wherein VAP film parcel for winding pipe outer wall, finally at the outer bag film sealed vacuum of really having time of laying of shell 3, ensure to pour into after the vacuum of whole system, after cure and demold, form carbon fibre composite part.
Accompanying drawing 3, for the middle rigidity porous flat plate schematic diagram of perfusion mould 1, is evenly equipped with pod apertures 14 on rigidity porous flat plate 4, pod apertures 14 apertures are at 2mm-4mm, and hole density is at 15mm-25mm; Rigidity porous flat plate 4 is that the rigid materials such as aluminium alloy, steel plate are made.
Accompanying drawing 4 is vacuum slot schematic diagram, vacuum slot 2 is conical horn structure, the top of vacuum slot 2 is for vacuumizing suction inlet 15, vacuumizing suction inlet 15 is a conical horn suction nozzle 16, the bottom of conical horn suction nozzle 16 is connected with a filter 17, on filter 17, have groove 18, in groove 18, be provided with capillary sucker 19.
Claims (5)
1. a thick size carbon fiber product vacuum infusion molding method, adopt vacuum infusion molding, utilize vacuum perfusion process to make large scale, thick carbon fiber product, it is characterized in that: flow-guiding screen is laid on to perfusion die surface, flow-guiding screen is slightly less than bottling body, apart from bottling body inward flange 20mm-70mm, on flow-guiding screen, cover release cloth, on release cloth, lay on request carbon cloth, bottling body is poured on carbon cloth, and bottling body outer surface is laid release cloth, injected rubber hose is located at the side of flow-guiding screen, and pours into toward bottling body by flow-guiding screen, lay rigidity porous flat plate at release cloth upper surface, rigidity porous flat plate area is slightly less than release cloth top surface edge 20mm-30mm, on rigidity porous flat plate, be equipped with and inhale collodion or vacuumize flow-guiding screen for providing negative pressure of vacuum layer to bottling body upper surface, inhale collodion or vacuumizing flow-guiding screen upper surface placement vacuum slot, the bottom of vacuum slot is used VAP film to seal, glue and vaccum suction pipe are intercepted vacuumizing while being whole bottling body in perfusion VAP film after glue penetrates into upper surface from the bottom to top like this, ensure the perfusion of carbon fiber bottling body, being used in conjunction with of described VAP film and vacuum slot, vacuum slot is conical horn structure, the top of vacuum slot is for vacuumizing suction inlet, vacuumizing suction inlet is a conical horn suction nozzle, the bottom of conical horn suction nozzle is connected with a filter, on filter, have groove, in groove, be provided with capillary sucker.
2. thick size carbon fiber product vacuum infusion molding method as claimed in claim 1, it is characterized in that: described flow-guiding screen is arranged in the bottom of carbon fiber laying, the glue of injected rubber hose is guided to glue the bottom of fiber laying fast by flow-guiding screen, the thickness of flow-guiding screen is not less than 2mm.
3. thick size carbon fiber product vacuum infusion molding method as claimed in claim 1, it is characterized in that: described rigidity porous flat plate needs to use in releasing agent effects on surface and aperture before use to be processed, after use, need the glue-line of rigidity porous flat plate to remove, reuse to facilitate.
4. thick size carbon fiber product vacuum infusion molding method as claimed in claim 1, it is characterized in that: described negative pressure provides for vavuum pump, negative pressure requires to reach in plains region-more than 0.09MPa pour into, and the requirement of highlands after according to every hundred meters of Pressure Drops controlled.
5. thick size carbon fiber product vacuum infusion molding method as claimed in claim 1, is characterized in that: on described rigidity porous flat plate, be evenly equipped with pod apertures, pod apertures aperture is at 2mm-4mm, and hole density is at 15mm-25mm; Rigidity porous flat plate is that aluminium alloy or steel plate rigid material are made.
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| CN201210054977.2A CN102582092B (en) | 2012-03-05 | 2012-03-05 | Vacuum infusion molding method for thick-size carbon fiber product |
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| CN201210054977.2A CN102582092B (en) | 2012-03-05 | 2012-03-05 | Vacuum infusion molding method for thick-size carbon fiber product |
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| CN103568849B (en) * | 2012-08-10 | 2016-01-20 | 江苏恒神股份有限公司 | A kind of carbon fiber composite pantograph air guide sleeve |
| CN104416920A (en) * | 2013-08-28 | 2015-03-18 | 上海艾郎风电科技发展有限公司 | Method for infusing wind turbine blade girder |
| TWI577844B (en) * | 2013-09-05 | 2017-04-11 | Porous composite powder | |
| CN103817832B (en) * | 2013-09-26 | 2016-08-24 | 上海飞机制造有限公司 | Mould and use the method that this mould carries out vacuum infusion molding |
| CN104044278B (en) * | 2014-05-30 | 2017-01-18 | 江苏中陆航星航空工业有限公司 | Vacuum adsorption joint and use method thereof |
| CN106142593B (en) * | 2015-04-10 | 2019-11-26 | 科思创德国股份有限公司 | The method for manufacturing article of fiber reinforced plastics |
| CN105690799B (en) * | 2016-03-23 | 2018-06-01 | 航天材料及工艺研究所 | The preparation method of carbon fiber enhancement resin base composite material rail vehicle headstock hood |
| CN105946249B (en) * | 2016-06-15 | 2017-12-12 | 保定华翼风电叶片研究开发有限公司 | A kind of preparation facilities and method tested with composite board sample |
| CN107053704B (en) * | 2017-03-31 | 2019-04-19 | 郑州磨料磨具磨削研究所有限公司 | High speed and ultrahigh speed grinding wheel base body molding vacuumizing joint and molding machine |
| CN107187080B (en) * | 2017-05-25 | 2020-03-31 | 中材科技(萍乡)风电叶片有限公司 | Vacuum infusion forming process method for thick composite material part |
| CN108312573B (en) * | 2018-02-01 | 2020-04-07 | 上海同磊土木工程技术有限公司 | Machining method of GFRP panel |
| CN110722709B (en) * | 2019-09-12 | 2021-09-14 | 保山隆基硅材料有限公司 | Carbon-carbon preform and preparation method thereof |
| CN111604230B (en) * | 2020-05-20 | 2024-03-19 | 魔方氢能源科技(江苏)有限公司 | Porous expanded graphite plate impregnating device and method |
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| US7060156B2 (en) * | 2001-07-23 | 2006-06-13 | Vrac, Llc | Three-dimensional spacer fabric resin interlaminar infusion media process and vacuum-induced reinforcing composite laminate structures |
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Effective date of registration: 20240111 Address after: 412007 Haitian Road, Tianyuan District, Zhuzhou, Hunan Province, No. 18 Patentee after: ZHUZHOU TIMES NEW MATERIAL TECHNOLOGY Co.,Ltd. Patentee after: National University of Defense Technology Address before: 412007 Haitian Road, Tianyuan District, Zhuzhou, Hunan Province, No. 18 Patentee before: ZHUZHOU TIMES NEW MATERIAL TECHNOLOGY Co.,Ltd. |