CN106079474A - A kind of naval vessel composite propeller blade preform and preparation method thereof - Google Patents
A kind of naval vessel composite propeller blade preform and preparation method thereof Download PDFInfo
- Publication number
- CN106079474A CN106079474A CN201610408962.XA CN201610408962A CN106079474A CN 106079474 A CN106079474 A CN 106079474A CN 201610408962 A CN201610408962 A CN 201610408962A CN 106079474 A CN106079474 A CN 106079474A
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- propeller blade
- fibre sleeving
- equal thickness
- thickness
- composite
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- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000000835 fiber Substances 0.000 claims abstract description 74
- 238000013461 design Methods 0.000 claims abstract description 29
- 238000009954 braiding Methods 0.000 claims abstract description 12
- 239000011162 core material Substances 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 17
- 239000004744 fabric Substances 0.000 claims description 13
- 239000006260 foam Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 7
- 239000004917 carbon fiber Substances 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 7
- 239000011521 glass Substances 0.000 claims description 3
- 230000008439 repair process Effects 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims 1
- 230000005494 condensation Effects 0.000 claims 1
- 230000032798 delamination Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 210000000744 eyelid Anatomy 0.000 description 4
- 239000011152 fibreglass Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 208000020442 loss of weight Diseases 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H1/00—Propulsive elements directly acting on water
- B63H1/02—Propulsive elements directly acting on water of rotary type
- B63H1/12—Propulsive elements directly acting on water of rotary type with rotation axis substantially in propulsive direction
- B63H1/14—Propellers
- B63H1/26—Blades
- B63H1/265—Blades each blade being constituted by a surface enclosing an empty space, e.g. forming a closed loop
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
- B29L2031/087—Propellers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Composite Materials (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
The present invention relates to a kind of naval vessel composite propeller blade preform and preparation method thereof, this composite propeller preform is compared to metal airscrew, composite propeller blade has lightweight, good corrosion resistance, hydrodynamic performance is superior, it can postpone the generation of cavity, reduces the corrosion of cavity, and its acoustic characteristic is excellent, reduce propeller noise, be conducive to improving the Stealth Fighter of naval vessels.In the present invention, fibre sleeving is main load carrier, fibre sleeving equal thickness designs and covers whole blade, the present invention is utilized effectively to achieve the quasi-two dimensionization of complex three-dimensional braiding, present invention effectively prevents the delamination at original blade guide margin and lagging edge and peel off problem, it not only reduces the difficulty of braiding, reduces cost, the deadweight of propeller blade can also be greatly reduced, improve the form accuracy of propeller blade.
Description
Technical field
The present invention relates to ship equipment design field, particularly relate to a kind of naval vessel composite propeller blade preform
And preparation method thereof.
Background technology
At present, the preparation technology of existing composite propeller is frequently with compression molding and RTM Shooting Technique.But mold
There is the problem of interlaminar strength in composite propeller prepared by moulding process, permanent be on active service lower easily initiation blade guide margin and lagging edge
The delamination at place is peeled off, and reduces work efficiency, even lost efficacy.RTM Shooting Technique is entered frequently with fiber cloth laying or weaving method
The making of row preform, can produce equally according to the mode of laying lead, delamination problems at lagging edge, and owing to being molded
Journey can make laying that trickle mobile change occurs, it is also difficult to ensures that all blade internal structures prepared by same mould are completely the same
Thus cause vibration noise problem；Additionally for the goods that this complex contour of marine propeller and required precision are higher, three-dimensional
The difficulty of braiding preform is relatively big, relatively costly.
Summary of the invention
The applicant, for above-mentioned existing issue, has carried out Improvement, it is provided that a kind of naval vessel composite propeller leaf
Sheet preform and preparation method thereof, not only avoid the delamination stripping problem of guide margin, lagging edge, also substantially reduces the difficulty of establishment
Degree, reduces cost, and propeller blade deadweight is greatly reduced.
The technical solution adopted in the present invention is as follows:
A kind of naval vessel composite propeller blade preform and preparation method thereof, comprises the following steps:
The first step: design equal thickness fibre sleeving, described equal thickness fibre sleeving according to the work loading conditions of propeller blade
Main load bearing component for composite propeller blade preform；
Second step: design according to the thickness of first step gained equal thickness fibre sleeving and make core；
3rd step: use braider to weave equal thickness fibre sleeving based on core；
4th step: cutting prepreg synusia is also pasted on the outer surface of equal thickness fibre sleeving and repairs, makes described pre-
Leaching material is revised to identical with propeller blade profile.
Its further technical scheme is:
Described equal thickness fibre sleeving thickness distribution is consistent；The design of described equal thickness fibre sleeving includes thickness design and fiber
Angle design, the design of described equal thickness fibre sleeving needs to meet the intensity of propeller blade and deformation requirements；
Blade face and the blade back of propeller blade are born normal direction skew by described core method for designing respectively along its surface；
Described offset distance is identical with fibre sleeving thickness；
The braiding of described fibre sleeving needs to reach the design requirement of fibre sleeving, and the design of described fibre sleeving requires to include fiber
The thickness requirement of set and fiber angles requirement；
In the 4th step, calculate the thickness distribution of propeller according to propeller blade profile offset, utilize three-dimensional modeling
Software on Drawing blade equal thickness distribution curve, is cut into the region shape of equal thickness distribution curve, each equal thickness by prepreg cloth
Region prepreg synusia quantity obtains according to area thickness and the prepreg cloth THICKNESS CALCULATION of equal thickness distribution curve, prepreg
The paving of sheet should be consistent to angle with the paving of fibre sleeving to angle；
Composite propeller blade preform includes internal for supporting the composite core film of establishment and being wrapped in
The equal thickness fibre sleeving of described composite core film, in the most bonding prepreg in periphery of described equal thickness fibre sleeving；
Described fibre sleeving material uses high intensity carbon fiber material to make, and described prepreg cloth is high-strength carbon fiber preimpregnation
Material cloth；
Described core is by numerical control cutting foam core material and one layer of glass laying being laid in described foam core material outer surface
Composition；
Beneficial effects of the present invention is as follows:
Compared to metal airscrew, composite propeller blade has lightweight, good corrosion resistance, and hydrodynamic performance is excellent
More, it can postpone the generation of cavity, reduces the corrosion of cavity, and its acoustic characteristic is excellent, reduces propeller noise, is conducive to carrying
The Stealth Fighter of high naval vessels.In the present invention, fibre sleeving is main load carrier, and fibre sleeving equal thickness designs and cover whole blade,
Utilize the present invention effectively to achieve the quasi-two dimensionization of complex three-dimensional braiding, present invention effectively prevents original blade guide margin and lagging edge
Problem is peeled off in the delamination at place, and it not only reduces the difficulty of braiding, reduces cost, moreover it is possible to propeller blade is greatly reduced
Deadweight, improves the form accuracy of propeller blade.
Accompanying drawing explanation
Fig. 1 is the structural representation of preform in the present invention.
Fig. 2 is the structural representation in preform cross section in the present invention.
Wherein: 1, equal thickness fibre sleeving；2, core；3, prepreg.
Detailed description of the invention
Below in conjunction with the accompanying drawings, the detailed description of the invention of the present invention is described.
As shown in Figure 1 and Figure 2, a kind of naval vessel composite propeller blade preform includes internal for supporting braiding
Composite core 2 and be wrapped in the equal thickness fibre sleeving 1 of composite core, the most viscous in the periphery of equal thickness fibre sleeving 1
Connect prepreg 3.The material of equal thickness fibre sleeving 1 uses high intensity modules carbon fibre material to make.Core 2 is by numerical control cutting foam
Core also lays one layer of glass laying in foam core material outer surface.
Embodiment 1:
As shown in Figure 1 and Figure 2, a kind of naval vessel composite propeller blade preform preparation method comprises the following steps:
The first step: utilize CFD software to calculate the hydrodynamic load under design conditions of propeller blade, and then design etc.
Thickness fibre sleeving 1, the thickness of above-mentioned equal thickness fibre sleeving 1 is 5mm, and fiber angles is [0/30/0/30] s.Through finite element software
Checking, the design of this equal thickness fibre sleeving 1 meets intensity and the deformation requirements of propeller blade.
Second step: design and make core according to the thickness of first step gained uniform thickness fibre sleeving 1, core method for designing is profit
(this offset distance is with above-mentioned with 3D sculpting software, along negative normal direction, propeller blade blade face and blade back to be offset 5mm respectively
The thickness of fibre sleeving 1 is identical), it is thus achieved that the profile (such as the appearance schematic diagram of Fig. 1 core mould 2) of core 2, and use outside foam core
The method applying fiberglass eyelid covering makes this core 2, and this core foam core material is PVC foam, and the fiberglass eyelid covering of external application is thick
Degree 0.5mm.
3rd step: using braider braiding equal thickness fibre sleeving on the basis of core 2, material is carbon fiber T700.Deng
The braiding of thickness fibre sleeving needs to reach the design requirement of fibre sleeving, i.e. equal thickness fibre sleeving thickness 5mm, and fiber angles is [0/
30/0/30]s。
4th step: first according to propeller blade profile offset in this step, utilizes 3D sculpting software to draw blade three
Dimension module, it is thus achieved that the equal thickness distribution curve of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm,
Carbon fiber prepreg cloth is cut into the region shape of described equal thickness distribution curve, each equal thickness region prepreg synusia quantity
The thickness 0.5mm calculating combining prepreg cloth according to this area thickness obtains, respectively 1～10 layer.The paving of synusia should be with to angle
The paving of fibre sleeving is consistent to angle, namely [0/30/0/30] s.Each synusia is pasted onto in order the outer surface of fibre sleeving, utilizes
This prepreg synusia correction preform profile, to identical with propeller blade profile, completes the making of preforming.
The preform completed, after RTM technique curing molding, has carried out profile measurement and strength test.After testing, leaf
Sheet profile meets 2 grades of tolerances of marine propeller physical dimension, its intensity and deformation and also meets requirement.And compared to aluminium alloy spiral
The deadweight of oar list blade 4.8kg, this composite propeller list blade deadweight 2.8kg, loss of weight 42%, and technique is simple, produces
Efficiency is higher.
Embodiment 2 (for the Design of Propeller of diameter 500mm):
As shown in Figure 1 and Figure 2, a kind of naval vessel composite propeller blade preform preparation method comprises the following steps:
The first step: utilize CFD software to calculate the hydrodynamic load under design conditions of propeller blade, and then design etc.
Thickness fibre sleeving 1, the thickness of above-mentioned equal thickness fibre sleeving 1 is 3mm, and fiber angles is [-30/0/45/-30/0/45] s.Through having
Limit meta software is checked, and the design of this equal thickness fibre sleeving 1 meets intensity and the deformation requirements of propeller blade.
Second step: design and make core according to the thickness of first step gained uniform thickness fibre sleeving 1, core method for designing is profit
(this offset distance is with above-mentioned with 3D sculpting software, along negative normal direction, propeller blade blade face and blade back to be offset 3mm respectively
The thickness of fibre sleeving 1 is identical), it is thus achieved that the profile (such as the appearance schematic diagram of Fig. 1 core mould 2) of core 2, and use outside foam core
The method applying fiberglass eyelid covering makes this core 2, and this core foam core material is PVC foam, and the fiberglass eyelid covering of external application is thick
Degree 0.1mm.
3rd step: using braider braiding equal thickness fibre sleeving on the basis of core 2, material is carbon fiber T300.Deng
The braiding of thickness fibre sleeving needs to reach the design requirement of fibre sleeving, i.e. equal thickness fibre sleeving thickness 3mm, fiber angles be [-
30/0/45/-30/0/45]s。
4th step: first according to propeller blade profile offset in this step, utilizes 3D sculpting software to draw blade three
Dimension module, it is thus achieved that the equal thickness distribution curve of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, is cut into described by prepreg cloth
The region shape of equal thickness distribution curve, each equal thickness region synusia quantity combines the thickness of prepreg cloth according to this area thickness
0.5mm calculates acquisition, respectively 1～6 layer.The paving of synusia should be consistent to angle with the paving of fibre sleeving to angle, namely [-30/0/45/-
30/0/45]s.Each synusia is pasted onto in order the outer surface of fibre sleeving, utilizes outside this prepreg synusia correction preform
Shape, to identical with propeller blade profile, completes the making of preforming.
The preform completed, after RTM technique curing molding, has carried out profile measurement and strength test.After testing, leaf
Sheet profile meets 2 grades of tolerances of marine propeller physical dimension, its intensity and deformation and also meets requirement.And compared to aluminium alloy spiral
The deadweight of oar list blade 3.2kg, this composite propeller list blade deadweight 1.7kg, loss of weight 47%, and technique is simple, produces
Efficiency is higher.
Above description is explanation of the invention, is not the restriction to invention, and limited range of the present invention sees right
Requirement, in the case of the basic structure of the present invention, the present invention can make any type of amendment.
Claims (10)
1. naval vessel composite propeller blade preform and preparation method thereof, it is characterised in that comprise the following steps:
The first step: designing equal thickness fibre sleeving according to the work loading conditions of propeller blade, described equal thickness fibre sleeving is multiple
The main load bearing component of condensation material propeller blade preform；
Second step: design according to the thickness of first step gained equal thickness fibre sleeving and make core；
3rd step: use braider to weave equal thickness fibre sleeving based on core.
2. the 4th step: cutting prepreg synusia is also pasted on the outer surface of equal thickness fibre sleeving and repairs, and makes described preimpregnation
Material is revised to identical with propeller blade profile.
3. a kind of naval vessel as claimed in claim 1 composite propeller blade preform and preparation method thereof, its feature
It is: described equal thickness fibre sleeving thickness distribution is consistent；The design of described equal thickness fibre sleeving includes thickness design and fiber angle
Degree design, the design of described equal thickness fibre sleeving needs to meet the intensity of propeller blade and deformation requirements.
4. a kind of naval vessel as claimed in claim 1 composite propeller blade preform and preparation method thereof, its feature
It is: blade face and the blade back of propeller blade are born normal direction skew by described core method for designing respectively along its surface.
5. a kind of naval vessel as claimed in claim 4 composite propeller blade preform and preparation method thereof, its feature
It is: described offset distance is identical with fibre sleeving thickness.
6. a kind of naval vessel as claimed in claim 1 composite propeller blade preform and preparation method thereof, its feature
Being: the braiding of described fibre sleeving needs to reach the design requirement of fibre sleeving, the design of described fibre sleeving requires to include fibre sleeving
Thickness requirement and fiber angles requirement.
7. a kind of naval vessel as claimed in claim 1 composite propeller blade preform and preparation method thereof, its feature
It is: in the 4th step, calculates the thickness distribution of propeller according to propeller blade profile offset, utilize 3D sculpting software
Draw blade equal thickness distribution curve, prepreg cloth is cut into the region shape of equal thickness distribution curve, each equal thickness region
Prepreg synusia quantity obtains according to area thickness and the prepreg cloth THICKNESS CALCULATION of equal thickness distribution curve, prepreg synusia
Paving should be consistent to angle with the paving of fibre sleeving to angle.
8. the composite propeller blade preform that as claimed in claim 1 prepared by method, it is characterised in that: include inside
For supporting the composite core film (2) of establishment and being wrapped in the equal thickness fibre sleeving (1) of described composite core film, in described
The most bonding prepreg in the periphery (3) of equal thickness fibre sleeving (1).
9. the composite propeller blade preform that as claimed in claim 6 prepared by method, it is characterised in that: described fiber
Cover material uses high intensity carbon fiber material to make, and described prepreg cloth is high-strength carbon fiber prepreg cloth.
10. the composite propeller blade preform that as claimed in claim 6 prepared by method, it is characterised in that: described core
Mould is by numerical control cutting foam core material and is laid in one layer of glass laying of described foam core material outer surface and forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610408962.XA CN106079474B (en) | 2016-06-12 | 2016-06-12 | A kind of naval vessel composite propeller blade preform and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610408962.XA CN106079474B (en) | 2016-06-12 | 2016-06-12 | A kind of naval vessel composite propeller blade preform and preparation method thereof |
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| Publication Number | Publication Date |
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| CN106079474A true CN106079474A (en) | 2016-11-09 |
| CN106079474B CN106079474B (en) | 2018-08-28 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106584883A (en) * | 2016-12-07 | 2017-04-26 | 中国人民解放军海军工程大学 | Underwater lightweight buoyancy compensating type composite material, solid-core, crash-proofing and energy absorbing structure unit |
| CN108192201A (en) * | 2017-12-25 | 2018-06-22 | 中广核俊尔新材料有限公司 | A kind of continuous fiber reinforced thermoplastic resin composite material quant blade and preparation method thereof |
| CN108466686A (en) * | 2018-03-29 | 2018-08-31 | 哈尔滨工业大学（威海） | A kind of propeller for watercraft blade and preparation method with piezo-electric damping |
| CN110815859A (en) * | 2019-11-29 | 2020-02-21 | 株洲时代新材料科技股份有限公司 | Design and manufacturing method of composite material blade and composite material blade |
| CN112519996A (en) * | 2020-12-10 | 2021-03-19 | 武汉理工大学 | Composite material propeller for underwater dynamic strain measurement and preparation method thereof |
| CN112937819A (en) * | 2021-03-30 | 2021-06-11 | 大连海事大学 | Corrosion-resistant and impact-resistant marine hybrid fiber composite propeller blade and preparation method thereof |
| CN114889153A (en) * | 2022-03-15 | 2022-08-12 | 云路复合材料(上海)有限公司 | Carbon fiber composite material unmanned aerial vehicle propeller preforming body weaving forming method |
| CN114889786A (en) * | 2022-05-17 | 2022-08-12 | 中国人民解放军海军工程大学 | Composite propeller blade |
| CN115258122A (en) * | 2022-07-07 | 2022-11-01 | 中国船舶重工集团公司第七一五研究所 | Light high-strength composite material alloy solid rudder plate and preparation method thereof |
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| CN106584883B (en) * | 2016-12-07 | 2019-06-18 | 中国人民解放军海军工程大学 | Underwater lightweight buoyancy offset-type composite material solid core crashworthiness endergonic structure unit |
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| CN110815859B (en) * | 2019-11-29 | 2022-03-29 | 株洲时代新材料科技股份有限公司 | Design and manufacturing method of composite material blade and composite material blade |
| CN112519996A (en) * | 2020-12-10 | 2021-03-19 | 武汉理工大学 | Composite material propeller for underwater dynamic strain measurement and preparation method thereof |
| CN112937819A (en) * | 2021-03-30 | 2021-06-11 | 大连海事大学 | Corrosion-resistant and impact-resistant marine hybrid fiber composite propeller blade and preparation method thereof |
| CN112937819B (en) * | 2021-03-30 | 2024-05-14 | 大连海事大学 | Corrosion-resistant impact-resistant marine hybrid fiber composite propeller blade and preparation method thereof |
| CN114889153A (en) * | 2022-03-15 | 2022-08-12 | 云路复合材料(上海)有限公司 | Carbon fiber composite material unmanned aerial vehicle propeller preforming body weaving forming method |
| CN114889786A (en) * | 2022-05-17 | 2022-08-12 | 中国人民解放军海军工程大学 | Composite propeller blade |
| CN115258122A (en) * | 2022-07-07 | 2022-11-01 | 中国船舶重工集团公司第七一五研究所 | Light high-strength composite material alloy solid rudder plate and preparation method thereof |
| CN115258122B (en) * | 2022-07-07 | 2023-09-08 | 中国船舶重工集团公司第七一五研究所 | Light high-strength composite alloy solid rudder plate and preparation method thereof |
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