CN102675848A - Carbon fibre-reinforced flaky moulding material for shielding electromagnetic waves as well as preparation method and application - Google Patents
Carbon fibre-reinforced flaky moulding material for shielding electromagnetic waves as well as preparation method and application Download PDFInfo
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- CN102675848A CN102675848A CN201210153236XA CN201210153236A CN102675848A CN 102675848 A CN102675848 A CN 102675848A CN 201210153236X A CN201210153236X A CN 201210153236XA CN 201210153236 A CN201210153236 A CN 201210153236A CN 102675848 A CN102675848 A CN 102675848A
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Abstract
The invention discloses a carbon fibre-reinforced flaky moulding material for shielding electromagnetic waves as well as a preparation method and application. The flaky moulding material contains the following components according to parts by weight: 60 to 100 of matrix resin, 30 to 100 of carbon fibre, 30 to 50 of low shrinking agent, 2 to 10 of wave absorbing agent, 130 to 230 of inorganic mineral filler, 1 to 4 of curing agent, 1 to 5 of thickening agent and 2 to 10 of other components; and the carbon fibre is carbon fibre which is not treated by graphitization, and acts as the function of absorbing electromagnetic waves in the compound material. The flaky moulding material has excellent electromagnetic wave shielding performance and mechanical performance and can be used for the fields of electronic equipment, traffic, military affairs and the like. The carbon fibre-reinforced flaky moulding material for shielding the electromagnetic waves is used as materials, such as a wave absorbing material, a battery case of an electric automobile with a novel energy resource, and an invisible material.
Description
Technical field
The present invention relates to the electromagnetic shielding material field, specifically a kind of electromagnetic wave shielding thomel strengthens sheet molding compound and preparation method and application.
Background technology
Electromagnetic shielding material mainly contains two kinds of effects, and the one, the protection electronic circuit is avoided the interference of external electromagnetic waves, and the 2nd, prevent the inner interference wave that produces to external emission, promptly play electromagnetic effect inside and outside the isolation.The research of electromagnetic shielding material is current relatively more active field, and various type materials are high towards shielding efficiency, the direction of light weight develops.Plastics replace metallic substance to become the main raw of housing in a large number, must increase the capability of electromagnetic shielding of plastic casing.Thomel is the filamentary material with HS, light weight, and has higher conductivity, and the carbon fiber reinforced plastics electromagnetic shielding material is the case material of ideal structure and function one.
The thomel of comparing with metal charge has the advantage of light weight.Thomel is fibrous carbon material, and promptly carbon accounts for more than 90% of total mass in its chemical constitution.Elemental carbon can form crystal forms such as diamond, graphite, Cabbeen according to the difference of its atom combination.With the variation of precursor and heat-treat condition, density is at 1.6～2.0g/cm
3Change, its mechanical property also changes in certain limit.The most outstanding characteristics of thomel are that intensity is big little with modulus height, density, and the same with carbon materials have good heat-resistance, an erosion resistance.The intensity of thomel surpasses metal titanium and the strongest steel, and intensity only is inferior to PBO minority fibers such as (aromatic heterocycle superpolymer fibers), and modulus surpasses all metals, organic polymer and inorganic ceramic fiber.Thomel has fabulous heat, electrical coductivity, good flame retardancy, extremely low thermal expansivity, and also have low radiation absorptivity, non magnetic and do not magnetize, fabulous vibration damping property, creep resistance and anti-fatigue performance and biocompatibility.
Electromagnetic shielding plastic mainly contains the surface conduction type and fills compound two big types at present.The surface conduction type is to utilize methods such as pasting tinsel, metallikon and plated by electroless plating to make frosting obtain very thin conductive metal layer.Top coat and surperficial spraying plating are used widely, but these conductive layers are peeled off and delamination through application year in year out is easy.Carbon fiber reinforced plastics be applied to electromagnetic shielding material be mainly fill compound.Filling compound is in non-conductive material, to add conductive filler material, can divide into filled, matrix material type by moulding technology.Filling compound is with conductive filler material and the compound shielding material that is formed as one of resin matrix.Conductive filler material generally is to select the fibrous or flaky material of the good large size of conductivity for use, like steel fiber or thomel.Compare with surface conduction type shielding material, fill the compound one-time formed characteristics that have, therefore reliable in quality also is the shielding material that has development prospect most.The particularly adding of thomel not only can be given its conduction and shielding properties, and its mechanical property will be improved greatly.It is compound that the application of thomel in shielding material is mainly filling.
Summary of the invention
The purpose of this invention is to provide a kind of electromagnetic wave shielding thomel and strengthen sheet molding compound and preparation method and application, the present invention in thomel enhancing sheet molding compound, adds people's chopped carbon fiber or the long filament thomel improves the material conductive capability and improves mechanical property.Resistivity significantly descends, and shield effectiveness is fairly obvious, and use characteristics is good, can be pressed into the complicated clamshell of shape.
The objective of the invention is to realize through following technical scheme:
A kind of electromagnetic wave shielding thomel strengthens sheet molding compound, and it is characterized in that: said sheet molding compound contains the component of following weight fraction ratio: matrix resin 60-100, thomel 30-100, shrinking agent 30-50, wave absorbing agent 2-10, inorganic mineral filler 130-230, solidifying agent 1-4, thickening material 1-5, other components 2-10; But but said matrix resin is the unsaturated polyester of thickening or the Vinylite of thickening; Said thomel is to play the thomel without graphitization processing that absorbs the hertzian wave effect; Said wave absorbing agent is one or more in metal-powder, steel fiber, ferrite and the graphitized carbon black.
Among the present invention, said thomel is chopped carbon fiber or long filament thomel.Said shrinking agent is any among PVAc, PS or the PMMA; Said inorganic mineral filler is any or several kinds in lime carbonate, white lake, talcum powder, kaolin, wilkinite or the mica; Said solidifying agent is TBPB or TBPB and TBPO composite initiation system; Said thickening material is alkalimetal oxide or alkali metal hydroxide.Said other components are releasing agent, oxidation inhibitor, UV light absorber, toughner, wetting dispersing agent, one or more in stopper or the static inhibitor.
A kind of electromagnetic wave shielding thomel strengthens the preparation method of sheet molding compound, it is characterized in that: this preparation method comprises resin paste preparation and sheet forming twice technology, and is specific as follows:
(1) elder generation is dispersed into uniform resin paste with filler, solidifying agent, thickening material and other components of matrix resin, shrinking agent, wave absorbing agent, inorganic mineral with high speed dispersor;
(2) pass through scattered resin paste the long filament thomel to be cut into chopped carbon fiber evenly to fall on the uniform blade coating to two of the sheet material machine nylon membrane, the nylon membrane that scribbles resin paste up and down is pressed in the centre to thomel, has formed a kind of " sandwich " structure;
During (3) through Dilvar zone, resin paste and thomel fully squeeze the back rolling, put into drying room to sheet material at last and carry out slaking to setting viscosity, obtain the electromagnetic wave shielding thomel and strengthen sheet molding compound.
A kind of electromagnetic wave shielding thomel strengthens sheet molding compound in electronics, traffic, application of military field.The present invention has excellent electromagnetic wave shielding performance and can be applicable in absorbing material, New-energy electric vehicle battery case, the stealth material.
The present invention is that a kind of excellent electromagnetic wave shielding performance high-strength carbon fibre strengthens sheet molding compound, adds people's chopped carbon fiber or long filament thomel raising material conductive capability and improves mechanical property at SMC.Resistivity significantly descends, and shield effectiveness is fairly obvious, and use characteristics is good, can be pressed into the complicated clamshell of shape.
Description of drawings
Fig. 1 is the absorbing property graphic representation of embodiment 1 among the present invention.
Fig. 2 is the absorbing property graphic representation of embodiment 2 among the present invention.
Fig. 3 is comparative example's among the present invention an absorbing property graphic representation.
Embodiment
Embodiment 1:
A kind of excellent electromagnetic wave shielding performance high-strength carbon fibre strengthens sheet molding compound, and sheet molding compound contains the component of following weight fraction ratio: matrix resin 60, thomel 60, shrinking agent 35, wave absorbing agent 5, inorganic mineral filler 180, solidifying agent 2, thickening material 2, releasing agent 4; Wherein: matrix resin is the epoxy vinyl resin; Thomel is the thomel without graphitization processing; Shrinking agent is PVAc; Wave absorbing agent is a ferrite; Inorganic mineral filler is a white lake; Solidifying agent is TBPB or TBPB and TBPO composite initiation system, and wherein the weight proportion of TBPB/TBPO is 0.7/0.3; Thickening material is a Natural manganese dioxide; Releasing agent is a Zinic stearas.
Above-mentioned epoxy vinyl resin, shrinking agent, wave absorbing agent, the filler of inorganic mineral, releasing agent, solidifying agent are pressed formula ratio drop into fully stirring in the high speed shear mixing machine, rotating speed is controlled at 1000rpm, stirs 8 minutes; Drop into rapidly the Natural manganese dioxide thickening material,, promptly shift two storages that are discarded to the SMC unit fast and stick with paste in the grooves high-speed stirring 1 minute; The upper and lower polyvinylidene film of walking evenly is coated with and applies the thick resin paste of 2mm; Continuous carbon fibre switches to group through circle and is cut into 24mm length, and chopped carbon fiber evenly is scattered in lower-layer resin and pastes over, through the pressure rod; Resin paste and fiber are soaked into mix one; Through adjustment rod excluding air, wrap-up coiled SMC volume gets into 40 ℃ of curing chambers then and carries out fast thickening again; After 60 hours, reach resin and fully soak into thomel, promptly accomplish the preparation that a kind of excellent electromagnetic wave shielding performance high-strength carbon fibre of the present invention strengthens sheet molding compound.
The excellent electromagnetic wave shielding performance high-strength carbon fibre that obtains strengthens sheet molding compound, can be applicable in absorbing material, New-energy electric vehicle battery case, the stealth material.
The excellent electromagnetic wave shielding performance high-strength carbon fibre that present embodiment makes strengthens sheet molding compound, is pressed into standard strip test intensity, tensile strength 167Mpa, flexural strength 243Mpa with pressing machine.
Be pressed into specification sample: 180mm * 180mm*2mm to sheet stock with flat plate mold.N5230 type vector network analyzer is adopted in the absorbing property test of sample, and the test frequency range is 8～18 GHz.Absorbing property curve such as Fig. 1 of obtaining.
Embodiment 2:
A kind of excellent electromagnetic wave shielding performance high-strength carbon fibre strengthens sheet molding compound, and sheet molding compound contains the component of following weight fraction ratio: matrix resin 60, thomel 80, shrinking agent 35, wave absorbing agent 8, inorganic mineral filler 180, solidifying agent 2, thickening material 2, releasing agent 4; Wherein: matrix resin is the epoxy vinyl resin; Thomel is the thomel without graphitization processing; Shrinking agent is PVAc; Wave absorbing agent is a ferrite; Inorganic mineral filler is a white lake; Solidifying agent is TBPB or TBPB and TBPO composite initiation system, and wherein the weight proportion of TBPB/TBPO is 0.7/0.3; Thickening material is a Natural manganese dioxide; Releasing agent is a Zinic stearas.
Above-mentioned epoxy vinyl resin, shrinking agent, wave absorbing agent, the filler of inorganic mineral, releasing agent, solidifying agent are pressed formula ratio drop into fully stirring in the high speed shear mixing machine, rotating speed is controlled at 1000rpm, stirs 8 minutes; Drop into rapidly the Natural manganese dioxide thickening material,, promptly shift two storages that are discarded to the SMC unit fast and stick with paste in the grooves high-speed stirring 1 minute; The upper and lower polyvinylidene film of walking evenly is coated with and applies the thick resin paste of 2mm; Continuous carbon fibre switches to group through circle and is cut into 24mm length, and chopped carbon fiber evenly is scattered in lower-layer resin and pastes over, through the pressure rod; Resin paste and fiber are soaked into mix one; Through adjustment rod excluding air, wrap-up coiled SMC volume gets into 40 ℃ of curing chambers then and carries out fast thickening again; After 60 hours, reach resin and fully soak into thomel, promptly accomplish the preparation that a kind of excellent electromagnetic wave shielding performance high-strength carbon fibre of the present invention strengthens sheet molding compound.
The excellent electromagnetic wave shielding performance high-strength carbon fibre that present embodiment makes strengthens sheet molding compound, is pressed into standard strip test intensity, tensile strength 223Mpa, flexural strength 312Mpa with pressing machine.
Be pressed into specification sample: 180mm * 180mm*2mm to sheet stock with flat plate mold.N5230 type vector network analyzer is adopted in the absorbing property test of sample, and the test frequency range is 8～18 GHz.Fig. 2 is the absorbing property graphic representation of embodiment 2.
The comparative example
Do not add thomel, sheet molding compound contains the component of following weight fraction ratio: matrix resin 60, thomel 0, shrinking agent 35, wave absorbing agent 5, inorganic mineral filler 180, solidifying agent 2, thickening material 2, releasing agent 4; Wherein: matrix resin is the epoxy vinyl resin; Shrinking agent is PVAc; Wave absorbing agent is a ferrite; Inorganic mineral filler is a white lake; Solidifying agent is TBPB or TBPB and TBPO composite initiation system, and wherein the weight proportion of TBPB/TBPO is 0.7/0.3; Thickening material is a Natural manganese dioxide; Releasing agent is a Zinic stearas.
Above-mentioned epoxy vinyl resin, thomel, shrinking agent, wave absorbing agent, the filler of inorganic mineral, releasing agent, solidifying agent are pressed formula ratio drop into fully stirring in the high speed shear mixing machine, rotating speed is controlled at 1000rpm, stirs 8 minutes; Drop into rapidly the Natural manganese dioxide thickening material,, promptly shift two storages that are discarded to the SMC unit fast and stick with paste in the grooves high-speed stirring 1 minute; The upper and lower polyvinylidene film of walking evenly is coated with and applies the thick resin paste of 2mm, through the pressure rod, resin paste and fiber is soaked into mix one; Again through adjustment rod excluding air; Wrap-up coiled SMC volume gets into 40 ℃ of curing chambers then and carries out fast thickening, after 60 hours, takes out.
Be pressed into specification sample: 180mm * 180mm*2mm to sheet stock with flat plate mold.N5230 type vector network analyzer is adopted in the absorbing property test of sample, and the test frequency range is 8～18 GHz.Fig. 3 is comparative example's an absorbing property graphic representation.
Can be known by the graphic representation contrast: after adding the thomel without graphitization processing that plays the effect of absorption hertzian wave, resistivity significantly descends, and shield effectiveness is fairly obvious.
Embodiment 3:
Embodiment 3 compares with embodiment 1, and only composition is different.A kind of excellent electromagnetic wave shielding performance high-strength carbon fibre strengthens sheet molding compound, and sheet molding compound contains the component of following weight fraction ratio: matrix resin 80, thomel 30, shrinking agent 30, wave absorbing agent 2, inorganic mineral filler 130, solidifying agent 1, thickening material 1, releasing agent 2.
Embodiment 4:
Embodiment 3 and embodiment 4, resistivity significantly descends, and shield effectiveness is obvious, and use characteristics is good, can be pressed into the complicated clamshell of shape.
Claims (7)
1. an electromagnetic wave shielding thomel strengthens sheet molding compound, and it is characterized in that: said sheet molding compound contains the component of following weight fraction ratio: matrix resin 60-100, thomel 30-100, shrinking agent 30-50, wave absorbing agent 2-10, inorganic mineral filler 130-230, solidifying agent 1-4, thickening material 1-5, other components 2-10; But but said matrix resin is the unsaturated polyester of thickening or the Vinylite of thickening; Said thomel is to play the thomel without graphitization processing that absorbs the hertzian wave effect; Said wave absorbing agent is one or more in metal-powder, steel fiber, ferrite and the graphitized carbon black.
2. electromagnetic wave shielding thomel according to claim 1 strengthens sheet molding compound, and it is characterized in that: said thomel is chopped carbon fiber or long filament thomel.
3. electromagnetic wave shielding thomel according to claim 1 strengthens sheet molding compound, and it is characterized in that: said shrinking agent is any among PVAc, PS or the PMMA; Said inorganic mineral filler is any or several kinds in lime carbonate, white lake, talcum powder, kaolin, wilkinite or the mica; Said solidifying agent is TBPB or TBPB and TBPO composite initiation system; Said thickening material is alkalimetal oxide or alkali metal hydroxide.
4. electromagnetic wave shielding thomel according to claim 1 strengthens sheet molding compound, and it is characterized in that: said other components are releasing agent, oxidation inhibitor, UV light absorber, toughner, wetting dispersing agent, one or more in stopper or the static inhibitor.
5. the described electromagnetic wave shielding thomel of a claim 1 strengthens the preparation method of sheet molding compound, it is characterized in that: this preparation method comprises that resin paste prepares and sheet forming twice technology, and is specific as follows:
Filler, solidifying agent, thickening material and other components with matrix resin, shrinking agent, wave absorbing agent, inorganic mineral is dispersed into uniform resin paste with high speed dispersor earlier;
Through on the uniform blade coating to two of the sheet material machine nylon membrane, the long filament thomel is cut into scattered resin paste chopped carbon fiber evenly falls, the nylon membrane that scribbles resin paste up and down is pressed in the centre to thomel, has formed a kind of " sandwich " structure;
During through Dilvar zone, resin paste and thomel fully squeeze the back rolling, put into drying room to sheet material at last and carry out slaking to setting viscosity, obtain the electromagnetic wave shielding thomel and strengthen sheet molding compound.
6. the described electromagnetic wave shielding thomel of claim 1 strengthens sheet molding compound in electronics, traffic, application of military field.
7. electromagnetic wave shielding thomel according to claim 6 strengthens the application of sheet molding compound in absorbing material, New-energy electric vehicle battery case, stealth material.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103540104A (en) * | 2013-10-23 | 2014-01-29 | 江苏兆鋆新材料科技有限公司 | Graphene oxide reinforced vinyl ester composite material and preparation method thereof |
| CN103849119A (en) * | 2012-12-06 | 2014-06-11 | 禹州市远大塑料电器有限责任公司 | High-heat-resistance and low-expansion-coefficient carbon fiber vinyl ester composite material and preparation method thereof |
| CN104017334A (en) * | 2014-06-20 | 2014-09-03 | 江苏兆鋆新材料股份有限公司 | High-modulus sheet molding compound (SMC) and production method thereof |
| CN104861689A (en) * | 2015-06-10 | 2015-08-26 | 无锡澳明威环保新材料有限公司 | Production method and formula of high-strength and high-toughness laminar film plastic |
| CN106432776A (en) * | 2016-09-22 | 2017-02-22 | 冷纯廷 | Method for conducting modifying treatment on sheet molding compound (SMC) by means of carbon fiber powder |
| CN106633736A (en) * | 2016-09-29 | 2017-05-10 | 铜陵市超越电子有限公司 | Radiation-proof thin-film capacitor shell |
| CN108003568A (en) * | 2017-12-13 | 2018-05-08 | 江西伟普科技有限公司 | A kind of preparation method with the injection molding adhesion composite material for absorbing radio frequency electromagnetic |
| CN109334190A (en) * | 2018-09-14 | 2019-02-15 | 无锡新宏泰电器科技股份有限公司 | A kind of electromagnetic masking sheet molding compound and preparation method thereof |
| CN111907092A (en) * | 2020-07-22 | 2020-11-10 | 杭州卡涞复合材料科技有限公司 | RTM (resin transfer molding) method for sandwich structure of automobile composite material battery box |
| CN111907088A (en) * | 2020-07-22 | 2020-11-10 | 杭州卡涞复合材料科技有限公司 | Mass production method of sandwich structure of automobile composite material battery box |
| CN112384364A (en) * | 2018-07-11 | 2021-02-19 | 麦格纳外饰公司 | Fire resistant SMC laminate |
| CN114133706A (en) * | 2021-10-29 | 2022-03-04 | 金发科技股份有限公司 | PBT composite material and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103849119A (en) * | 2012-12-06 | 2014-06-11 | 禹州市远大塑料电器有限责任公司 | High-heat-resistance and low-expansion-coefficient carbon fiber vinyl ester composite material and preparation method thereof |
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| CN106432776A (en) * | 2016-09-22 | 2017-02-22 | 冷纯廷 | Method for conducting modifying treatment on sheet molding compound (SMC) by means of carbon fiber powder |
| CN106633736A (en) * | 2016-09-29 | 2017-05-10 | 铜陵市超越电子有限公司 | Radiation-proof thin-film capacitor shell |
| CN108003568A (en) * | 2017-12-13 | 2018-05-08 | 江西伟普科技有限公司 | A kind of preparation method with the injection molding adhesion composite material for absorbing radio frequency electromagnetic |
| CN108003568B (en) * | 2017-12-13 | 2019-12-17 | 江西伟普科技有限公司 | Preparation method of injection molding bonding composite material capable of absorbing radio frequency electromagnetic waves |
| CN112384364A (en) * | 2018-07-11 | 2021-02-19 | 麦格纳外饰公司 | Fire resistant SMC laminate |
| CN109334190A (en) * | 2018-09-14 | 2019-02-15 | 无锡新宏泰电器科技股份有限公司 | A kind of electromagnetic masking sheet molding compound and preparation method thereof |
| CN111907092A (en) * | 2020-07-22 | 2020-11-10 | 杭州卡涞复合材料科技有限公司 | RTM (resin transfer molding) method for sandwich structure of automobile composite material battery box |
| CN111907088A (en) * | 2020-07-22 | 2020-11-10 | 杭州卡涞复合材料科技有限公司 | Mass production method of sandwich structure of automobile composite material battery box |
| CN114133706A (en) * | 2021-10-29 | 2022-03-04 | 金发科技股份有限公司 | PBT composite material and preparation method and application thereof |
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