CN102166848A - Electromagnetic shielding composite material and preparation method thereof - Google Patents
Electromagnetic shielding composite material and preparation method thereof Download PDFInfo
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- CN102166848A CN102166848A CN2010106119105A CN201010611910A CN102166848A CN 102166848 A CN102166848 A CN 102166848A CN 2010106119105 A CN2010106119105 A CN 2010106119105A CN 201010611910 A CN201010611910 A CN 201010611910A CN 102166848 A CN102166848 A CN 102166848A
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Abstract
The invention provides an electromagnetic shielding composite material and a preparation method thereof, wherein the electromagnetic shielding composite material comprises a base material and a wire mesh, wherein the wire mesh is embedded into the base material. The technical scheme provided by the invention solves the problems that the electromagnetic shielding material in the related technology has poor stability, higher cost and relatively complicated process and is difficult to adapt to outdoor severe environments and the like, thereby achieving the effects that the electromagnetic shielding material provided by the invention has good environmental suitability, lower cost and simple machining process and is suitable for mass production.
Description
Technical field
The present invention relates to electronic communication field, in particular to a kind of electromagnetic shielding composite material and preparation method thereof.
Background technology
Fast development along with the industry of hyundai electronics electrical equipment, various wireless communication systems and electronic device quantity sharply increase, and cause electromagnetic interference and electromagnetic compatibility phenomenon serious day by day, and the electromagnetic pollution problem is outstanding day by day, therefore, industry is more and more paid attention to the electromagnetic compatibility of electronic electric equipment.Simultaneously, some electronic electric equipments are carried out electromagnetic shielding, can reduce environment to equipment or equipment radiation interference to environment, make equipment adapt to the complex work environment, guarantee that equipment normally realizes design function, the reliability of raising equipment, security, but also can alleviate electromagnetic pollution to natural environment.
At present, one of main method of electromagnetic shielding is to adopt various shielding materials that electromagnetic radiation is effectively intercepted and loss.Shielding is a transmission channel of utilizing shield (material with particular characteristic) prevention or decay electromagnetic interference energy, thereby suppresses electromagnetic interference.Shielding has two purposes: the electromagnetic energy of restricted internal radiation leaks; Prevent that external radiation interference from entering.
For realizing above-mentioned shielding purpose, often adopt metal material to make gauze screen in the correlation technique, mesh is closeer, and the effect of shielding is better.Adopt whole metal-back, the best results of shielding.But material therefor can the more increase along with the density of mesh like this, simultaneously, has also increased the weight of screen layer.Yet the decay resistance of metal material is relatively poor relatively, can not satisfy outdoor such as peracid, environment such as high-alkali or maritime.
Along with the continuous progress of science and technology, various novel shielding materials have appearred.The macromolecule shielding material is outstanding person wherein.The macromolecule shielding material utilizes conducting particles in the macromolecule matrix or conduction, the magnetic conduction particle in the doping people macromolecule matrix to play shielding action.Therefore, also often be called the filled-type shielding material.It is present most widely used filled with metal type shielding material that shielding material is filled by nickel system, and electric conductivity is good, moderate; Carbon is that nonmetal filling shielding material light weight, price are low, but its electric conductivity is relatively poor relatively; Composite filled type shielding material more and more is subjected to the market favor because of having better comprehensive performance.The shielding less stable of this class material, non-refractory, UV resistant can not satisfy the carrying demand of load greatly, can not be used for adverse circumstances such as high soda acid.
In addition, also have membrane shield material, conduction high polymer shielding material, nano shielding material.Nano composite material has characteristics such as absorption band is wide, multi-functional, light weight, thin thickness.The multilayer screen structural material is greatly improved aspect the shielding properties with respect to the single-layer shield structural material.But these materials cost an arm and a leg because of it, and reasons such as stability are difficult to realize large-scale application.
All there is certain limitation in some aspects in the above various current material, and is particularly relatively poor to the outdoor environment adaptive capacity.At the problems referred to above in the correlation technique, effective solution is not proposed as yet at present.
Summary of the invention
In correlation technique, existing electromagnetic shielding material, less stable, cost are higher, technology is complicated and be difficult to adapt to problem such as outdoor adverse circumstances, the invention provides a kind of electromagnetic shielding composite material and preparation method thereof, one of to address the above problem at least.
According to an aspect of the present invention, provide a kind of electromagnetic shielding composite material, comprising: base material and woven wire, wherein, this woven wire is embedded in the above-mentioned base material.
According to another aspect of the present invention, provide a kind of preparation method of electromagnetic shielding composite material, comprising: base material is shared in the mould; With the woven wire of well cutting, share above the base material in the mould; Will be to the mould closure, the heating pressurization, compression moulding up to base material being flowed and being full of die cavity to mould, obtains electromagnetic shielding composite material.
Among the present invention, by adopting woven wire to be embedded in the described base material, solved that electromagnetic shielding material less stable, the cost in the correlation technique is higher, technology is complicated and has been difficult to adapt to problem such as outdoor adverse circumstances, and then it is good to have reached the electromagnetic shielding material environmental suitability, cost is lower, processing technology is simple, is fit to the effect of producing in enormous quantities.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the electromagnetic shielding composite material generalized section of embodiment according to the present invention 1;
Fig. 2 is the woven wire exposed surface schematic diagram of the electromagnetic shielding composite material of embodiment according to the present invention 2;
Fig. 3 is electromagnetic shielding composite material preparation method schematic diagram according to the preferred embodiment of the invention.
The specific embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
A kind of electromagnetic shielding composite material comprises: base material and woven wire, wherein, above-mentioned woven wire is embedded in the base material.In concrete application process, because the shielding properties of electromagnetic shielding composite material is to realize by the shield effectiveness of woven wire, and above-mentioned woven wire can be embedded in the base material, therefore stability and the service life that has strengthened above-mentioned electromagnetic shielding composite material.
Preferably, base material is sheet molding compound (Sheet Moulding Compound abbreviates SMC an as) material.Because base material is the SMC material, the SMC material is high temperature resistant, anticorrosive, ageing-resistant, the high voltage protection performance is good, electrical insulating property is strong, therefore above-mentioned electromagnetic shielding composite material can adapt to various adverse circumstances such as strong acid, highly basic.
Preferably, woven wire is communication zinc plated mild carbon steel silk.
Preferably, woven wire is embedded in base material outer surface or base material inside.Can realize the flexibility of electrically conducting manner like this.
Preferably, a woven wire part is embedded in the base material outer surface, and remainder is embedded in base material inside.Can realize the flexibility of electrically conducting manner like this.
By the foregoing description as can be seen, adopt SMC material and method, material proportion is lighter, and environmental suitability is good, stable performance, and cost is lower, and the pressing molding cycle is short, is fit to produce in enormous quantities.
For understanding the foregoing description better, describe in detail below in conjunction with instantiation.
Example 1
Fig. 1 is the electromagnetic shielding composite material generalized section of embodiment according to the present invention 1.As shown in Figure 1, electromagnetic shielding composite material is made up of SMC basic unit 101, woven wire and SMC basic unit binder course 102, oven wire mesh blanket 103.Wherein, when oven wire mesh blanket 103 is pressed into or is embedded in SMC basic unit 101 when inner, individualism oven wire mesh blanket 103 not then, electromagnetic shielding composite material only are made up of SMC basic unit 101 and woven wire and SMC basic unit binder course 102.
Example 2
Fig. 2 is the woven wire exposed surface schematic diagram of the electromagnetic shielding composite material of embodiment according to the present invention 3.As shown in Figure 2, electromagnetic shielding composite material comprises SMC base material 201 and woven wire 202.After the formed product, woven wire 202 is embedded in the SMC base material 201, forms one deck screen layer.Woven wire 202 can be embedded into different depth or position in the SMC basic unit 201 as required.
In this example, electromagnetic shielding composite material can be according to demand, by the mould design woven wire added bundle and expose etc. in internal layer, top layer, part, realizes various conduction demands flexibly.
Example 3
This example provides SMC and woven wire compression molding.Wherein, the density of SMC is 1.75～1.95g/cm3, the about 10000MPa of tensile modulus of elasticity, and the about 65MPa of tensile stress at break, the about 9500MPa of the modulus of elasticity in static bending, the about 155MPa of bending strength belongs to duroplastic moulding materials, sheet.Woven wire can be selected flexibly by the electromagnetic shielding requirement, comprises the material, wire net mesh number of woven wire etc.The composite lighter weight, the SMC corrosion resistance is strong, and the outdoor products application life can reach 20 years.
By this example as can be seen, this example provides the composite of a kind of lighter weight, fine corrosion resistance, has solved existing metal electromagnetic shielding material---problems such as quality is heavier, corrosion resistance is relatively poor in the correlation technique.Simultaneously because shielding properties guarantees stable performance by the oven wire mesh blanket that SMC embeds.SMC is high temperature resistant, anticorrosive, ageing-resistant, the high voltage protection performance is good, electrical insulating property is strong, can adapt to various adverse circumstances such as strong acid, highly basic.
The embodiment of the invention also provides a kind of preparation method of electromagnetic shielding composite material, comprising:
Base material is shared in the mould;
With the woven wire of well cutting, share above the base material in the mould;
Will be to the mould closure, the heating pressurization, compression moulding up to base material being flowed and being full of die cavity to mould, obtains electromagnetic shielding composite material.
Preferably, base material is a sheet molding compound SMC material.
Preferably, woven wire is communication zinc plated mild carbon steel silk.
Preferably, woven wire is pressed into certain depth in the base material, makes the woven wire in the electromagnetic shielding composite material be embedded in base material outer surface or base material inside.
Preferably, woven wire is pressed into certain depth in the base material, makes the woven wire part in the electromagnetic shielding composite material be embedded in base layer exterior surface, remainder is embedded in basic unit inside.
Describe above-mentioned preferred implementation in detail below in conjunction with Fig. 3 and example 3.
Example 3
In this example, select the electric fiber reinforcement unsaturated polyester die plastic of using as the SMC base material, use zinc plated mild carbon steel silk 19# (several 19 orders of standard mesh, screen size 1.00mm) as the mold pressing basic material with communicating by letter, and according to production engineering specifications cutting some and shape.Wherein, electric with fiber reinforcement unsaturated polyester die plastic employing GB SMC-UP (GF30+MD40), Q, FR/130, wherein, SMC represents sheet molding compound, and UP represents unsaturated polyester resin, and GF30 represents glass fiber content 27.5%～32.5%, MD40 represents breeze content 42.5%～47.5%, Q represents compression moulding process, and FR represents fire-retardant, 130 expression humidity index 〉=130 ℃.As shown in Figure 3, this method comprises:
The first, with 304 designs of metal die die 301 and punch, completion of processing;
The second, with a certain amount of sheet SMC base material 302, share in the metal negative 301;
The 3rd, with the woven wire 303 of well cutting, share in the metal negative 301 above the sheet SMC base material 302;
The 4th, metal die 304 is displaced downwardly to woven wire 303 contacts, heating (160 ℃), pressurization (18MPa), then, punch 304 continues to move down, and realizes the closure of punch 304 and die 301, finishes compression moulding;
The 5th, under this temperature (160 ℃) and this pressure (18MPa), make punch 304 and die 301 keep the 180s closure, make 302 plasticizings of sheet SMC base material, flow and be full of die cavity, make woven wire 303 be pressed into certain depth in the sheet SMC base material 302, and make products solidifying, obtaining resultant articles is electromagnetic shielding composite material.
In this example, the SMC technological process of production mainly comprises the resin paste preparation, goes up processes such as sticking with paste operation, fiber cutting sedimentation, dipping, multiviscosisty, film-making, because above-mentioned technological process can be inquired about in correlation technique and learn, repeats no more herein.Then sheet SMC is spread in the mould, and on request woven wire is also spread in the mould, last, processing is finished in heating, pressurization, excipient, insulation.Properties of product are stable, and technology is simple, and cost is lower.
It is pointed out that in this example that above-mentioned SMC base material can be selected other similar material for use, be not limited to adopt GB SMC-UP (GF30+MD40), Q, FR/130.
Comprehensive the foregoing description, the shielding properties of electromagnetic shielding composite material are to realize by the shield effectiveness of woven wire, and environmental suitability determines by the SMC material properties.Woven wire and SMC material product maturation, processing technology is simple, and cost is lower, thereby determines that this electromagnetic shielding composite material cost is lower.Woven wire and SMC mass density are all less, and the composite mass density is also less.The flexibility of electrically conducting manner can distribute and adds that the bundle mode realizes and control by the mould design by the layer of woven wire in composite.Solved the electromagnetic shielding material in the correlation technique, less stable, cost are higher, technology is complicated and be difficult to adapt to problem such as outdoor adverse circumstances, and then it is good to have reached the electromagnetic shielding material environmental suitability, and cost is lower, processing technology is simple, is fit to the effect of producing in enormous quantities.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an electromagnetic shielding composite material is characterized in that, comprising: base material and woven wire, wherein,
Described woven wire is embedded in the described base material.
2. composite according to claim 1 is characterized in that, described base material is a sheet molding compound SMC material.
3. composite according to claim 1 is characterized in that, described woven wire is communication zinc plated mild carbon steel silk.
4. according to each described composite of claim 1 to 3, it is characterized in that described woven wire is embedded in the inside of the outer surface or the described base material of described base material.
5. according to each described composite of claim 1 to 3, it is characterized in that a described woven wire part is embedded in described base material outer surface, remainder is embedded in described base material inside.
6. the preparation method of an electromagnetic shielding composite material is characterized in that, comprising:
Base material is shared in the mould;
With the woven wire of well cutting, share described on the base material in the mould;
To the mould closure, heating is pressurizeed with described, and compression moulding up to described base material being flowed and being full of described die cavity to mould, obtains electromagnetic shielding composite material.
7. method according to claim 6 is characterized in that, described base material is a sheet molding compound SMC material.
8. method according to claim 6 is characterized in that, described woven wire is communication zinc plated mild carbon steel silk.
9. according to each described method of claim 6 to 8, it is characterized in that, also comprise: described woven wire is pressed into certain depth in the described base material, makes the described woven wire in the described electromagnetic shielding composite material be embedded in described base material outer surface or described base material inside.
10. according to each described method of claim 6 to 8, it is characterized in that, also comprise: described woven wire is pressed into certain depth in the described base material, make the described woven wire part in the described electromagnetic shielding composite material be embedded in described base material outer surface, remainder is embedded in described base material inside.
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| CN2010106119105A CN102166848A (en) | 2010-12-29 | 2010-12-29 | Electromagnetic shielding composite material and preparation method thereof |
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| CN2010106119105A CN102166848A (en) | 2010-12-29 | 2010-12-29 | Electromagnetic shielding composite material and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106541640A (en) * | 2015-09-22 | 2017-03-29 | 中国科学院长春应用化学研究所 | A kind of electric machine room housing composite and preparation method thereof |
| CN112218512A (en) * | 2020-08-31 | 2021-01-12 | 河南工程学院 | Polymer-based electromagnetic shielding composite material with gradient structure and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04110278A (en) * | 1990-08-30 | 1992-04-10 | Isuzu Motors Ltd | Molding of electromagnetic shield type resin outer plate |
| CN101009995A (en) * | 2007-01-19 | 2007-08-01 | 青岛大学 | A method for making the electromagnetic radiation prevention electrical appliance shell |
-
2010
- 2010-12-29 CN CN2010106119105A patent/CN102166848A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04110278A (en) * | 1990-08-30 | 1992-04-10 | Isuzu Motors Ltd | Molding of electromagnetic shield type resin outer plate |
| CN101009995A (en) * | 2007-01-19 | 2007-08-01 | 青岛大学 | A method for making the electromagnetic radiation prevention electrical appliance shell |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106541640A (en) * | 2015-09-22 | 2017-03-29 | 中国科学院长春应用化学研究所 | A kind of electric machine room housing composite and preparation method thereof |
| CN112218512A (en) * | 2020-08-31 | 2021-01-12 | 河南工程学院 | Polymer-based electromagnetic shielding composite material with gradient structure and preparation method thereof |
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Application publication date: 20110831 |