CN101402256B - Compression moulding forming method with wet-process for wave-suction composite material - Google Patents
Compression moulding forming method with wet-process for wave-suction composite material Download PDFInfo
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- CN101402256B CN101402256B CN2008101412910A CN200810141291A CN101402256B CN 101402256 B CN101402256 B CN 101402256B CN 2008101412910 A CN2008101412910 A CN 2008101412910A CN 200810141291 A CN200810141291 A CN 200810141291A CN 101402256 B CN101402256 B CN 101402256B
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Abstract
The invention provides a wet compression molding forming method for wave-absorbing composite materials. The method comprises the following technological steps: firstly, a resin glue solution is prepared and uniformly dispersed; secondly, fabrics and the prepared resin glue solution undergo wet contact molding, namely wet ply stacking setting, and air bubbles generated during the ply stacking process are exhausted; and thirdly, the wave-absorbing composite materials after wet ply stacking undergo die stamping and solidifying on a platen-press, and the means of die stamping and solidifying is as follows: the composite materials after setting undergo solidified forming on the platen-press which is preheated to 40 DEG C, heat insulation at a constant temperature of 40 DEG C for 30 to 40 minutes, heat insulation for 40 to 60 minutes after the temperature is continuously raised to 80 DEG C and stabilized, and then undergo demoulding after a heating device of the press is closed and the temperature is naturally reduced to below 50 DEG C when the pressure is maintained, and the wave-absorbing composite materials can be obtained; and 1 to 2 MPa is exerted during the whole die stamping process. The wet compression molding forming method can make up for the limitation of the prior forming method, improve the marine environment resistance of the wave-absorbing composite materials, and improve the reproducibility and the designability of the wave-absorbing composite materials.
Description
Technical field
The invention belongs to stealthy technical field of function materials, mainly propose a kind of compression moulding forming method with wet-process of Wave suction composite material, relate to the Wave suction composite material moulding of using under the marine environment and improve one's methods.
Background technology
Wave suction composite material is made up of the resin matrix with different electric magnetic property and mechanical property, fortifying fibre, absorbent etc., and generally absorbent being dispersed in according to certain rule becomes a kind of multi-gradient functional material that carries and inhale the ripple dual-use function that has concurrently in fiber (glass fibre, aramid fiber, quartz fibre etc.) the enhancing resin matrix.What gradient-structure was general is designed to: outermost layer has good wave penetrate capability, and bottom is a total reflection layer to stop radar beam incident internal body, and is middle for absorbing the consumption layer that looses.Each part is all carried out Electromagnetic Design and mechanical property design effectively according to dielectric gradient, then optimum organization and then form an electromagnetic resulting structure of absorption loss.Wave suction composite material possesses certain bearing capacity simultaneously, can be shaped to the structure of a lot of complicacies, can use as the structure member of naval vessel or aircraft.With compared with metal, this material has remarkable advantages, becomes one of main developing direction in present Radar Stealth Materials technical development field.
The present forming method of Wave suction composite material mainly contains contactmolding and prepreg compression molding method.These two kinds of methods all have comparatively significantly limitation.The contactmolding advantage is can absorbent be scattered in the matrix resin comparatively equably, and shortcoming is that influenced by human factor very big, and prepared composite property discreteness is big, can't satisfy the long-term instructions for use under the severe rugged environment (like marine environment); General conductive reinforcement fibers and the resin with differing dielectric constant of adopting of prepreg compression molding method made prepreg, and the gradation of solid microwave absorption adds in the prepreg then.This method advantage is that influenced by human factor less, and prepared Wave suction composite material has good reappearance and anti-severe rugged environment performance, and shortcoming is that the solid microwave absorption adds difficulty, needs repeatedly to fill.As: rolled up in the 1st phase " National University of Defense technology's journal " in 2005 27; People such as Cao Yi have made the conductive fiber of three kinds of different resistivity by oneself and have been made into the quadrature plain; Select for use phenolic resins to add a small amount of absolute ethyl alcohol wiring solution-forming, three kinds of plains are immersed in the solution, dry and process prepreg; Spread layer, mold pressing then, curing obtains Wave suction composite material under 180 ℃.Obtained Wave suction composite material bending strength is 173MPa, and bending modulus is 12.5GPa, can be in 8.4GHz～18GHz scope behind the adding aluminium plate backing absorption of realization-10dB; Taiwan patent " the multiple material radar-wave absorbing structure and the manufacturing approach thereof of shell the form " (patent No.: I258293) propose at first to make a kind of continuous fiber preimpregnation cloth; In continuous fiber preimpregnation cloth, adopt the way of repeatedly adding absorbent then; Methods such as employing heating are therebetween permeated in preimpregnation cloth absorbent; Reach 10～25% until absorbent volume content, last warming and pressurizing obtains the multiple material of shell shape.The multiple material thickness 0.5mm～5mm of prepared absorbent structure, absorption frequency is between 0.5～20GHz.Can know that by above analysis contactmolding and prepreg compression molding method are made Wave suction composite material and had separately advantage and limitation.
Summary of the invention
The object of the invention promptly is the compression moulding forming method with wet-process that proposes a kind of Wave suction composite material, to remedy the existing existing limitation of forming method, improves the anti-marine environment performance of Wave suction composite material, improves the reappearance and the designability of Wave suction composite material.
Its processing step of the compression moulding forming method with wet-process of Wave suction composite material proposed by the invention is:
1, preparation resin adhesive liquid, and be uniformly dispersed;
2, also be the wet lamination typing with fabric and the resin adhesive liquid wet method contact moudling for preparing, in the layer process of shop the bubble that produces discharged;
3, the Wave suction composite material behind the wet lamination is carried out mold pressing, curing on platen-press; Its molded curing mode is: at first composite materials after setting is being preheated to curing molding on 40 ℃ the platen-press, 40 ℃ of stable insulations 30～40 minutes, is continuing to be warming up to 80 ℃; Stable back insulation 40～60 minutes; Close the press heater, under the constant situation that keep-ups pressure, the demoulding when being cooled to below 50 ℃ naturally; Can obtain Wave suction composite material, the mold process whole process 1～2MPa that exerts pressure.
Said resin adhesive liquid is fully to be disperseed to form through equipment such as high speed dispersion device or ultrasonic separating apparatus by resin, intermediate temperature setting agent and different types of radar wave absorbing agent.
Said resin, intermediate temperature setting agent, radar wave absorbing agent and component proportioning are and are adopted in the present Wave suction composite material; Can adopt vinyl ester resin like resin; The intermediate temperature setting agent can be adopted methyl ethyl ketone peroxide, cyclohexanone peroxide etc., and radar wave absorbing agent can be ferrite, carbonyl iron dust, polycrystal iron fiber, CNT etc.
In the molded curing system of forming method of the present invention, the purposes that 40 ℃ of insulation platforms are provided with: the abundant preheating of resin in the reinforcing material, viscosity reduces, and under certain pressure, unnecessary resin is discharged from and absorbent is retained in the material system to greatest extent; After 30～40 minutes, resin and absorbent contents tend towards stability in the composite.
40 ℃～80 ℃ pressurize temperature rise periods: it is constant to keep solidifying pressure, and temperature rises to 80 ℃ by 40 ℃, and in this process, the part resin continues to be extruded, along with temperature raises, and the slow crosslinked sclerosis of beginning in the molecular resin, this time in stage is 20～25min;
80 ℃ of insulation platform area, resin stops to flow fully, and the interior crosslink density of molecular resin increases composite system gradually and can fully solidify, and makes the interface stability of reinforcing material and interlaminar resin, improves the anti-marine environment performance of material, and this time in stage is 40～60min;
Back cure stage is closed the press heater, under the constant situation that keep-ups pressure, naturally cools to below 50 ℃, and this moment, composite fully obtained solidifying, and performance tends towards stability, and this time in stage is 80～100min.
The wet method compression molding method that the present invention adopts is that contact moudling and the compression molding extensively adopted are at present combined; Overcome the limitation of two kinds of methods; Not only can accurately control the distribution of absorbent in matrix material; Be beneficial to the design of Wave suction composite material, and the composite that makes have excellent mechanical property and the abominable marine environment performance of anti-complicacy.
The specific embodiment
Embodiment 1
With vinyl ester resin, cyclohexanone peroxide, absorbent 94RC according to table 1 mixing of weighing, through high speed dispersor be uniformly dispersed (3000r/min, 40min).(be of a size of: 300mm * 300mm) the shop layer is finalized the design, and spreads in the layer process the bubble that produces discharge as far as possible with the strong glass fabric of 25 floor heights that has cut then.Typing back composite is being preheated to curing molding on 40 ℃ the platen-press.In the time of 40 ℃, be incubated 30 minutes, be warming up to 80 ℃ then, treat to be incubated 40 minutes behind the temperature stabilization.Close the press heater at last, the demoulding when naturally cooling to below 50 ℃ can get Wave suction composite material.Remain pressure 1MPa therebetween.Prepared Wave suction composite material thickness is 4mm, and hot strength is 420MPa, and bending strength is 331MPa, and the wet flexural strength retention rate is 88.6%, and under 8～18GHz, RCS reflectivity mean value is-5dB.
Table 1
Embodiment 2
Vinyl ester resin, cyclohexanone peroxide, absorbent CB33 are stipulated to weigh mixing according to table 2; Be uniformly dispersed through ultrasonic separating apparatus; (be of a size of: 320mm * 320mm) the shop layer is finalized the design, and spreads in the layer process the bubble that produces discharge as far as possible with cutting the strong glass fabric of 82 floor heights then.Typing back composite is being preheated to curing molding on 40 ℃ the platen-press.In the time of 40 ℃, be incubated 40 minutes, be warming up to 80 ℃ then, treat to be incubated 60 minutes behind the temperature stabilization.Close the press heater at last, the demoulding when naturally cooling to below 50 ℃ can get Wave suction composite material.Remain pressure 2MPa therebetween.Prepared Wave suction composite material thickness is 14mm, and hot strength is 432MPa, and bending strength is 367MPa, and the wet flexural strength retention rate is 89.2%, and under 8～18GHz, RCS reflectivity mean value is-10dB.
Table 2
Claims (1)
1. Wave suction composite material compression moulding forming method with wet-process, it is characterized in that: processing step of the present invention is:
(1), the preparation resin adhesive liquid, and be uniformly dispersed;
(2), also be the wet lamination typing with fabric and the contact moudling of prepared resin glue solution wet method, in the layer process of shop the bubble that produces is discharged;
(3), the Wave suction composite material behind the wet lamination is carried out mold pressing, curing on platen-press; Its molded curing mode is: composite materials after setting is being preheated to curing molding on 40 ℃ the platen-press, 40 ℃ of stable insulations 30～40 minutes, is continuing to be warming up to 80 ℃; Stable back insulation 40～60 minutes; Close the press heater, under the constant situation that keep-ups pressure, the demoulding when being cooled to below 50 ℃ naturally; Can obtain Wave suction composite material, mold process whole process applies 1～2MPa.
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| CN101402256B true CN101402256B (en) | 2012-08-15 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101902898B (en) * | 2009-12-02 | 2012-05-30 | 安泰科技股份有限公司 | Multilayer type electromagnetic wave absorber and manufacturing method thereof |
| CN102316711B (en) * | 2011-06-22 | 2014-04-02 | 东华大学 | Wave-absorbing stealthy material with active carbon-fiber felt screen (ACFFS) structure and preparation method thereof |
| CN105269911A (en) * | 2014-05-27 | 2016-01-27 | 深圳光启创新技术有限公司 | Wave absorbing material and forming method thereof |
| CN104029459B (en) * | 2014-05-28 | 2016-01-27 | 中国船舶重工集团公司第七二五研究所 | A kind of resistance to marine environment and the preparation method of low weightening finish Wave suction composite material |
| CN108252114B (en) * | 2018-02-09 | 2020-12-29 | 青海大学 | Silicon carbide fiber cloth reinforced polyimide resin-based structural wave-absorbing material and preparation method thereof |
| CN111844804B (en) * | 2020-07-20 | 2022-08-30 | 中国人民解放军火箭军工程大学 | Microwave curing process and device for fiber winding composite material |
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| CN1528806A (en) * | 2003-10-21 | 2004-09-15 | 中国航空工业第一集团公司北京航空材 | Method for preparing thermoplastic blended resin based composite material |
| CN1872768A (en) * | 2005-06-03 | 2006-12-06 | 上海瑞欣装饰材料有限公司 | Method for fabricating decorative board for anti double high tension and extra high tension |
| CN1923481A (en) * | 2006-09-12 | 2007-03-07 | 张力新 | Bamboo filament fibre board and bamboo filament, method for making bamboo filament fibre board |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1528806A (en) * | 2003-10-21 | 2004-09-15 | 中国航空工业第一集团公司北京航空材 | Method for preparing thermoplastic blended resin based composite material |
| CN1872768A (en) * | 2005-06-03 | 2006-12-06 | 上海瑞欣装饰材料有限公司 | Method for fabricating decorative board for anti double high tension and extra high tension |
| CN1923481A (en) * | 2006-09-12 | 2007-03-07 | 张力新 | Bamboo filament fibre board and bamboo filament, method for making bamboo filament fibre board |
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