CN1415649A - Granular composite material containing metal fiber and its mfg. method - Google Patents
Granular composite material containing metal fiber and its mfg. method Download PDFInfo
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- CN1415649A CN1415649A CN 01134255 CN01134255A CN1415649A CN 1415649 A CN1415649 A CN 1415649A CN 01134255 CN01134255 CN 01134255 CN 01134255 A CN01134255 A CN 01134255A CN 1415649 A CN1415649 A CN 1415649A
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Abstract
A granular polymer composition contains a bundle of metallic fibres parallel to each other, the first high-molecular material used as the first coated layer of each metallic fibre, and the second high-molecular material used as the second coated layer of each metallic fibre. It car be used as the raw material of plastic objects for low cost and higher antistatic and electromagnetic sheiding effect.
Description
Technical field
The present invention relates to a kind of particulate state polymer composite (granular polymer composite) and manufacture method thereof that includes steel fiber (metal fibers), and supply to do the made plastic article of moulding raw material (plastic article) about this granular composite material.
Background technology
The casing of existing electronic product and instrument etc. mostly adopts and comes moulding as macromolecular materials such as ABS, PU, PVC, PC, PC+ABS, nylon (Nylon), resin, rubber, in the hope of reaching light weight, inexpensive purpose.Yet, along with to electronic product and instrument need have antistatic and electromagnetic interference shield (electromagnetic interference shielding, EMI shielding) under the strict day by day situation, generally can stick tinsel, for example Copper Foil or aluminium foil in casing inside.Obviously, above-mentioned prior art was both time-consuming, and had significantly increased the manufacturing cost of electronic product and instrument.
In order to shorten the manufacturing time of the plastic article with EMI shield effectiveness, and reduce manufacturing cost, existing known technology utilization contains the particulate state polymer composite of electro-conductive fiber, as the raw material of plastic article moulding.Why above-mentioned plastic article has antistatic and the EMI shield effectiveness, and its reason is the electro-conductive fiber that has uniformly dispersing in this plastic article, and is configured to conductive network because of overlap joint phenomenon (bridging phenomenon) between electro-conductive fiber.As seen, whether the distribution of electro-conductive fiber in plastic article be even, and fiber and the interfibrous situation that is connected, and whether also promptly overlap phenomenon obvious, directly has influence on the effect of the EMI function of shielding of plastic article.Investigate and cause plastic article inner conductive fiber distribution uniformity coefficient and overlap joint rule to resemble whether obvious key, be to contain the particulate state polymer composite of electro-conductive fiber itself.
About containing the particulate state polymer composite of electro-conductive fiber, existing invention quite a lot is disclosed, now related art is listed below: Taiwan patent of invention notification number the 126th, No. 625, No. the 4th, 788,104, United States Patent (USP), United States Patent (USP) the 4th, 880, No. the 5th, 137,782, No. 679 and United States Patent (USP).Conclude prior art, owing to must consider between the plastic article shaping period, pulling force and shearing that electro-conductive fiber institute may bear, the therefore high steel fiber of employing rigidity mostly, just be unlikely and cause fiber between the plastic article shaping period, to rupture, reduce the EMI shield effectiveness.In addition, matrix material is to develop towards the direction that still can reach rational EMI shield effectiveness under low electro-conductive fiber content.In order to allow electro-conductive fiber scatter in plastic article evenly, in this plastic article moulding process, electro-conductive fiber must be kept a high proportion of original length (L), and the ratio (L/D ratio) of length and diameter (D) is necessary for a high value.Generally speaking, the L/D ratio must be more than or equal to 100.
In the prior art of the above-mentioned relevant particulate state polymer composite that contains electro-conductive fiber, raw material is done in the plastic grain confession that contains Stainless Steel Fibre (stainless steelfibers) of being researched and developed out with Belgian Bekaert company at present, and the antistatic and EMI shield effectiveness of the plastic article that moulding is made is preferable.Yet Bekaert still has some problems about the technology of the particulate state polymer composite of metal fiber, has to be overcome.Problem and the shortcoming of Bekaert about the technology of the particulate state polymer composite of metal fiber below will be described in detail in detail
At first, as shown in Figure 1, the plastic grain that contains Stainless Steel Fibre 10 that Bekaert researched and developed out, mainly be that the stainless steel continuous fibre of bunchy is imbedded in the macromolecular material on its manufacture method, make a matrix material thigh (strand), and then this matrix material thigh cut-out is made this plastic grain 10.What need emphasize is, in this plastic grain 10, macromolecular material 11 is the Stainless Steel Fibres 12 that coating bunchy, between Stainless Steel Fibre haply not composition from state.In practical application, the plastic grain that contains the Stainless Steel fiber of Bekaert must mix with the plastic grain that does not contain Stainless Steel Fibre, is made for the raw material of the injection molding (injection molding) of plastic article.Obviously, in the plastic article moulding process, Stainless Steel Fibre must partly migrate to the plastic grain that does not contain Stainless Steel Fibre from former plastic grain, and Stainless Steel Fibre reaches uniformly dispersing and by the overlap joint phenomenon, the EKI shield effectiveness of expection can be arranged.Be enough to illustrate the plastic grain that contains the Stainless Steel fiber of Bekaert thus, in the plastic article moulding process, allow Stainless Steel Fibre scatter and evenly just have obstacle in the sky earlier, that is exactly that Stainless Steel Fibre migrates to the plastic grain that does not contain Stainless Steel Fibre from former plastic grain.
Research according to Bekaert, for Stainless Steel Fibre can be scattered in the plastic article moulding process evenly, a branch of at least Stainless Steel Fibre need be processed to form curling shape in the multi beam Stainless Steel Fibre, with regard to Bekaert research staff's viewpoint, the curved Stainless Steel Fibre of rolling can allow the multi beam Stainless Steel Fibre of not imbedding as yet in the macromolecular material can become comparatively loose gathering.But just the present inventor's long term studies is found, the Stainless Steel Fibre of curling shape can scatter uniform effect contribution and little to Stainless Steel Fibre in the plastic article moulding process, can bring the shortening useful length to cause overlapping phenomenon on the contrary reduces, and curling shape Stainless Steel Fibre is entangled with easily in the manufacturing processed, and it is inhomogeneous to cause Stainless Steel Fibre to scatter on the contrary.Just why Bekaert is about containing the plastic grain of the shape Stainless Steel Fibre that curls for this, and its curling shape Stainless Steel Fibre only is the major cause that accounts for the part of multi beam Stainless Steel Fibre, and the researchist of Bekaert does not lay down a definition to this more.It must be emphasized that in addition even if the plastic grain of Bekaert contains the Stainless Steel Fibre of the shape that curls, it is still the raw material that must mix with the particle that does not contain Stainless Steel Fibre as the plastic article moulding.
Even to this day, when the plastic grain that contains Stainless Steel Fibre of Bekaert is used in injection molding, still must adopt expensive specific injection shaper, compare with the general single screw of injection shaper that adopts, price differs tens of times.If adopt the specific injection shaper, jointly, Stainless Steel Fibre will inevitably bear powerful shearing (Shear force) in the plastic material that melts that is heated, and then causes a large amount of Stainless Steel Fibre fractures.Well imagine that average L and L/D value significantly reduce, the overlap joint phenomenon is not obvious, and the EMI shield effectiveness also decreases.
Secondly, when the plastic grain that contains Stainless Steel Fibre of Bekaert was used in injection molding, if will allow the Stainless Steel Fibre uniformly dispersing in plastic article, its injection molding was created conditions and must be controlled very accurately.Therefore, it is quite low to utilize the plastic grain injection molding that contains Stainless Steel Fibre of Bekaert to produce the productivity of plastic article.Lay the blame on the polymer composite that contains steel fiber of using Bekaert, be difficult to produce the reason of the plastic article that can meet the EMI shield effectiveness, be that mainly Stainless Steel Fibre flocks together in its matrix material, be difficult for to each other disperseing, so that in the plastic article moulding process, Stainless Steel Fibre is difficult to separately carry out uniformly dispersing.What need emphasize is even if Bekaert has done curling shape processing with a branch of at least Stainless Steel Fibre in the multi beam Stainless Steel Fibre, expect to make Stainless Steel Fibre can become comparatively loose gathering before imbedding macromolecular material, but effect to be still not good.
Therefore, the object of the present invention is to provide a kind of polymer composite and manufacture method thereof that includes steel fiber, particularly, isolated by macromolecular material between steel fiber in this matrix material, and then at the raw material that is made for the plastic article moulding, between the plastic article shaping period, steel fiber reaches homodisperse extremely easily, the overlap joint phenomenon is obvious.Use the polymer composite of metal fiber of the present invention, can under the low situation of steel fiber content, can reach reasonably antistatic and EMI shield effectiveness.
In addition, for making every effort to reduce time and the cost that plastic article is made, another object of the present invention is to provide a kind of particulate state polymer composite that includes steel fiber, particularly, it can directly be made for the raw material that the plastic article moulding is used, and need not mix with the particulate state macromolecular material of metal fiber not to be made for the raw material that the plastic article moulding is used again.Manufacture method is easy, uses general easy injection moulding machine to achieve the goal.
In addition, in the polymer composite of metal fiber, the conduction property of steel fiber itself and magnetic conduction character, also influence is made for the effect of antistatic and EMI shielding of the plastic article of moulding.Therefore, another object of the present invention is to provide a kind of polymer composite and manufacture method thereof that includes the higher steel fiber of surface conductivity, and then promote the effect of the antistatic and EMI shielding of the plastic article that is made for moulding.
Summary of the invention
The object of the present invention is to provide a kind of granular composite material and manufacture method thereof that includes steel fiber.Particularly, isolated by macromolecular material between steel fiber in this kind matrix material, and then at the raw material that directly is made for the plastic article moulding, between the plastic article shaping period, steel fiber reaches homodisperse extremely easily, the overlap joint phenomenon is obvious.With the plastic article of the granular composite material institute moulding of metal fiber of the present invention, can under the low situation of steel fiber content, can reach reasonably antistatic and EMI shield effectiveness.
Another object of the present invention is to provide a kind of granular composite material and manufacture method thereof that includes the higher steel fiber of surface conductivity, and then promote the effect of the antistatic and EMI shielding of the plastic article that is made for moulding.
Above-mentioned purpose of the present invention is achieved in that
A kind of granular composite material of metal fiber is characterized in that, it comprises: a branch of steel fiber, and each the root steel fiber in this bundle steel fiber becomes to be arranged in parallel in essence; One first macromolecular material, this first macromolecular material forms a coating of each the root steel fiber in this bundle steel fiber; And one second macromolecular material, this second macromolecular material forms by a coating of this bundle steel fiber of this first macromolecular material lining.
A kind of manufacture method of granular composite material of metal fiber is characterized in that, comprises the following step:
(a) at least one continuous metal fiber carried out a dispersion treatment;
(b) guide this at least one continuous metal fiber of dispersive immerse a lining composition of forming by one first macromolecular material, cause this first macromolecular material to form a coating of each the root steel fiber in this at least one continuous metal fiber;
(c) this at least one continuous metal fiber of this first macromolecular material of oven dry lining;
(d) this at least one continuous metal fiber of set becomes one (strand);
(e) guide the lining composition that this burst immersion is made up of one second macromolecular material, cause this second macromolecular material to form a coating of this strand;
(f) this thigh of this second macromolecular material of oven dry lining; And
(g) cut off this strand of this second macromolecular material of lining and then obtain the granular composite material of this metal fiber.
Matrix material according to the present invention comprises a branch of steel fiber.Each root steel fiber in this bundle steel fiber becomes to be arranged in parallel in essence.This matrix material and comprise one first macromolecular material and one second macromolecular material.This first macromolecular material forms a coating of each the root steel fiber in this bundle steel fiber, and this second polymer material layer forms by a coating of this bundle steel fiber of this first macromolecular material lining.According to particulate state polymer composite of the present invention, the shared volume ratio scope of this bundle steel fiber is 1%～50%.About the preparation of steel fiber, mainly be that the Stainless Steel Fibre with the tool magnetic diffusivity is a heart yearn, further for promoting its surface conduction degree, at metallic substance such as the surface-coated copper of Stainless Steel Fibre, nickel, silver, gold and cobalts.In actual applications, the proportional range that is overlayed on the radius of the thickness on surface of Stainless Steel Fibre and Stainless Steel Fibre is 0.05 to 0.5.Stainless Steel Fibre adds the metallic substance of lining, and the diameter of whole fiber still must be in the scope of 5 μ m to 50 μ m.The surface conductivity of each root steel fiber is more than or equal to 0.08 ohm.
This granular composite material further is made for the raw material that a plastic article moulding is used, and whereby, the moulding of this plastic article is with low cost, and antistatic and effectiveness is good.
About the advantages and spirit of the present invention can by following detailed Description Of The Invention and shown in accompanying drawing be further understood.
Below, in conjunction with preferred embodiment and accompanying drawing thereof, feature of the present invention, spirit and advantage are described in further detail.
Description of drawings
Fig. 1 is plastic grain and the structure kenel synoptic diagram thereof that a prior art contains Stainless Steel Fibre;
Fig. 2 A and Fig. 2 B are according to the polymer composite of a preferred embodiment of the present invention and structure kenel synoptic diagram thereof;
Fig. 3 discloses the manufacturing processed of making polymer composite of the present invention.
Embodiment
The invention provides in a kind of granular composite material and the manufacture method thereof that includes steel fiber, particularly this kind matrix material and isolated by macromolecular material between steel fiber, and this steel fiber is the higher steel fiber of a surface conductivity.According to granular composite material of the present invention and then directly be made for the raw material of plastic article moulding, between the plastic article shaping period, steel fiber reaches homodisperse extremely easily, the overlap joint phenomenon is obvious.Use particulate state polymer composite of the present invention, can under the low situation of steel fiber content, can reach reasonably antistatic and EMI shield effectiveness.
Please refer to Fig. 2 A and Fig. 2 B, Fig. 2 A and Fig. 2 B are disclosed is structure kenel (morphology) according to a particulate state polymer composite 20 of a preferred embodiment of the present invention.Shown in Fig. 2 A and Fig. 2 B, this particulate state polymer composite 20 comprises a branch of steel fiber 21, one first macromolecular material 22 and one second macromolecular material 23.It is characterized in that each the root steel fiber in this bundle steel fiber 21 becomes to be arranged in parallel in essence.This first macromolecular material 22 forms a coating of each the root steel fiber in this bundle steel fiber 21.This second macromolecular material 23 forms by a coating of this bundle steel fiber of this first macromolecular material lining.
Shown in Fig. 2 A and Fig. 2 B, polymer composite 20 according to the present invention is substantially outward appearance and presents columned particulate state polymer composite.This bundle steel fiber 21 in this matrix material is that the end from this cylindrical particles shape matrix material extends to the other end.
Polymer composite 20 according to the present invention is made for the materials of a plastic article moulding, and the mode of moulding can be injection molding, extrusion molding (extrusion), pultrusion (pultrusion) or die cast (compression molding) etc.According to polymer composite 20 differences from prior art of the present invention, not with other not the macromolecule material particle materials and parts of metal fiber mix, but directly be made for the materials of this plastic article moulding.In one embodiment, the main component of this first macromolecular material 22 and this second macromolecular material 23 is identical with the main macromolecular material composition of this plastic article, also be that existing various electronic product and electronic machine extensively adopt moulding to manufacture the macromolecular material of casing, for example, ABS, PU, PVC, PC, PC+ABS, Nylon, thermoplastic resin, rubber etc.That is to say that according to polymer composite of the present invention, its first macromolecular material 22 and this second macromolecular material 23 need not prepare especially.
In one embodiment, at least a couplant is added in this first macromolecular material 22, for example, and organic silicide (silanes), zirconate (zirconate) and titanate (titanates) etc.Above-mentioned couplant be added with the absorption that is beneficial to 22 pairs of steel fiber 21 surfaces of this first macromolecular material.In another specific embodiment, each root steel fiber 21 surface is at least a couplant of lining earlier, and this first macromolecular material 22 that is covered again is beneficial to promote the absorption on 22 pairs of steel fiber 21 surfaces of this first macromolecular material.
According to polymer composite 20 of the present invention, its size need cooperate creating conditions of existing various shaper, therefore, and no specific standard on steel fiber number and the matrix material overall dimensions.By and large, for allowing steel fiber be easy to scatter evenly in this plastic article moulding process, the content of steel fiber can not be too high, and the general fibre number scope that adopts is 200 to 24,000 fibers.In one embodiment, to account for the overall volume of this matrix material 20 be 1%～50% than scope to this bundle steel fiber 21.
In one embodiment, the diameter range of each the root steel fiber in this bundle steel fiber 21 is 5 μ m to 50 μ m.In one embodiment, the average L/D value of this bundle steel fiber 21 is greater than 100.
In one embodiment, each the root steel fiber main component in this bundle steel fiber 21 is the Stainless Steel Fibre of a tool magnetic diffusivity.The preparation of the Stainless Steel Fibre of tool magnetic diffusivity, raw material can adopt austenite stainless steel (austentic stainless steel), for example, steel grades such as SUS302,304,316L, utilize boundling pull (bundle drawing) manufacture method, under suitable Fabrication parameters such as pull, can make the Stainless Steel Fibre of the marquensite phase that has changed the tool magnetic diffusivity substantially into, relevant prior art please refer to United States Patent (USP) the 2nd, 050, No. 298 and United States Patent (USP) the 3rd, 277, No. 564, detailed create conditions not do at this give unnecessary details.In addition, the preparation of the Stainless Steel Fibre of tool magnetic diffusivity, it is stainless steel (ferritic stainlesssteel) that raw material also can adopt ferrite, SUS430 steel grade for example, or adopting marquensite is stainless steel (martensiticstainless steel), for example SUS410 and 416 steel grades utilize boundling pull manufacture method to make.
Be the effect that the antistatic and EMI that promotes this plastic article shields, Stainless Steel Fibre can pass through pre-process, to promote its surface conduction degree.In one embodiment, Stainless Steel Fibre utilizes a deposition method for preparing, in preferable metallic substance of electroconductibility such as surface-coated copper, nickel, silver, gold.In another specific embodiment, Stainless Steel Fibre utilizes a deposition method for preparing, in the preferable metallic substance of magnetic diffusivity such as surface-coated cobalt.
In actual applications, the proportional range that is overlayed on the radius of the thickness on surface of Stainless Steel Fibre and Stainless Steel Fibre is 0.05 to 0.5.Stainless Steel Fibre adds the metallic substance of lining, and the diameter of whole fiber still must be in the scope of 5 μ m to 50 μ m.The surface conductivity of each root steel fiber is more than or equal to 0.08 ohm.
Below will be described in detail the manufacturing processed of particulate state polymer composite of the present invention.Ask for an interview manufacturing process shown in Figure 3, at first step S31 carries out a dispersion treatment with the continuous metal fiber for preparing, and for example, utilizes a vacuum take-off (vacuum suction) that each root continuous metal fiber is disperseed fully.
About the preparation of steel fiber, as previously mentioned, mainly be that the Stainless Steel Fibre with the tool magnetic diffusivity is a heart yearn, further for promoting its surface conduction degree, in metallic substance such as the surface-coated copper of Stainless Steel Fibre, nickel, silver, gold and cobalts.In actual applications, the proportional range that is overlayed on the radius of the thickness on surface of Stainless Steel Fibre and Stainless Steel Fibre is 0.05 to 0.5.Stainless Steel Fibre adds the metallic substance of lining, and the diameter of whole fiber still must be in the scope of 5 μ m to 50 μ m.The surface conductivity of each root steel fiber is more than or equal to 0.08 ohm
Then carry out step S32, guide this fully dispersive continuous metal fiber immerse a lining composition of forming by one first macromolecular material, cause this first macromolecular material to form a coating of each root continuous metal fiber.Proceed step S33, the continuous metal fiber of this first macromolecular material of oven dry lining.Then carry out step S34, assemble each root continuous metal fiber and become one (strand).Proceed step S35, guide the lining composition that this burst immersion is made up of one second macromolecular material, cause this second macromolecular material to form a coating of this strand.Then carry out step S36, this thigh of this second macromolecular material of oven dry lining.Carry out step S37 at last, cut off this thigh of this second macromolecular material of lining and then obtain this granular composite material.
In order to promote the absorption on 22 pairs of steel fiber 21 surfaces of this first macromolecular material, in one embodiment, between step S31 and step S32, guiding earlier this fully dispersive continuous metal fiber immerse in the couplant solution, cause surface-coated this couplant of each root steel fiber, the continuous metal fiber of this couplant of oven dry lining subsequently.In another specific embodiment, also insert at least one couplant in the composition of this first macromolecular material.
The EMI effect of the plastic article of application polymer composite of the present invention institute moulding then will be described, the main component that below will be plastic article with ABS is an example, the plastic grain that contains diameter 8 μ m 304 Stainless Steel Fibres with Bekaert that the market is sold (D.2mm, L:6mm) contain the plastic grain (D:2mm of diameter 8 μ m 304 Stainless Steel Fibres with the present invention, L:6mm) test sample book of difference injection molding gained is done EMI shield effectiveness test relatively.Sample is to adopt single screw of injection shaper to outpour moulding to make, and injection molding creating conditions is controlled at 240 ℃, spiro rod rate 30rpm, pressure 30pound, injection port diameter 5mm for: temperature.Test sample book is of a size of: 15cm * 15cm, thickness 3mm.The composition of various samples please be shown in Table 1.
Table 1
| Sample number | The raw material source | ABS content (Vol.%) | Stainless Steel Fibre content (Vol.%) |
| Sample A | ????Bekaert’s | ????80 | ????20 |
| Sample A ' | ????King’s | ????80 | ????20 |
| Sample B | ????Bekaert’s | ????85 | ????15 |
| Sample B ' | ????King’s | ????85 | ????15 |
| Sample C | ????Bekaert’s | ????95 | ????5 |
| Sample C ' | ????King’s | ????95 | ????5 |
The plastic grain of Bekaert ' s:Bekaert manufacturing
King ' s: the plastic grain of manufacturing according to the present invention
Need to prove; the plastic grain that contains Stainless Steel Fibre of Bekaert manufacturing is sold in the market; its Stainless Steel Fibre content 60～70Vol.%; therefore must mix the injection molding raw material that is made for test sample book with the plastic grain that does not contain Stainless Steel Fibre; then be prepared into composition as shown in table 1 according to plastic grain of the present invention, and directly be made for the injection molding raw material of test sample book.
EMI shield effectiveness test frequency interval range is between 0.3MHz to 3GHz, and list test frequency respectively at 900MHz, 1,800MHz, 1,900MHz and 2, the EMI shield effectiveness that the 450MHz place gets, as the comparative descriptions of the plastic grain of the present invention and Bekaert, DCO the results are shown in table 2.
Table 2
| Sample number | Stainless Steel Fibre content (Vol.%) | Test frequency (MHz) | EMI shield effectiveness (dB) |
| Sample A | 20 | ????900 | ??34.02 |
| ????1800 | ??38.08 | ||
| ????1900 | ??39.095 | ||
| ????2450 | ??39.60 | ||
| Sample A ' | 20 | ????900 | ??36.50 |
| ????1800 | ??40.05 | ||
| ????1900 | ??41.55 | ||
| ????2450 | ??42.10 | ||
| Sample B | 15 | ????900 | ??15.17 |
| ????1800 | ??21.21 | ||
| ????1900 | ??22.09 | ||
| ????2450 | ??21.50 | ||
| Sample B ' | 15 | ????900 | ??23.77 |
| ????1800 | ??28.87 | ||
| ????1900 | ??29.79 | ||
| ????2450 | ??29.62 |
| Sample C | ????5 | ????900 | ????7.00 |
| ????1800 | ????5.66 | ||
| ????1900 | ????6.39 | ||
| ????2450 | ????3.56 | ||
| Sample C ' | ????5 | ????900 | ????9.01 |
| ????1800 | ????7.70 | ||
| ????1900 | ????8.50 | ||
| ????2450 | ????5.50 |
Significantly, under the situation of various Stainless Steel Fibre content, all higher EMI shield effectiveness is arranged than the test sample book of Bekaert according to plastic grain of the present invention and then the test sample book made.Similarly EMI shield effectiveness test changes the test sample book main component into PU, PVC, PC, PC+ABS and Nylon respectively, occurs the test sample book of injecting according to plastic grain of the present invention too, and its EMI shield effectiveness comes highly than Bekaert's.In addition with regard to technological standpoint, the polymer composite method of sincere metal fiber provided by the present invention is applicable to other mentioned macromolecule components in patent specification not.Additionally must emphasize; plastic grain according to plastic grain of the present invention and Bekaert does not exist together; plastic grain of the present invention need not mix with the plastic grain that does not contain stainless steel metal fibre, directly is made for the injection molding raw material of test sample book, and manufacturing time has tangible shortening.
In addition, the plastic grain that the steel fiber (Stainless Steel Fibre) of the preferable metallic substance of the electroconductibility such as copper, nickel, metal plate, gold that are covered about application surface is made, and then the plastic article of injection molding gained, its EMI shield effectiveness and Bekaert and according to steel fiber in the plastic article of the present invention be not covered the preferable metal of electroconductibility EMI shield effectiveness test relatively, comparative result is listed in table 3.Sample B in the table 3 and sample B ', its raw material source, raw material form and create conditions all with table 1 in listed sample B and sample B ' identical.And listed sample B in the table 3 "; its raw material source, raw material are formed and are created conditions also and sample B ' roughly the same; difference is sample B " the 8 μ m304 Stainless Steel Fibres that adopted, and its surface and lining copper, the thickness of the copper that is covered is about 0.05 with Stainless Steel Fibre diameter ratio.Can obviously find out sample B from the data that table 3 is listed " and sample B ' the EMI shield effectiveness tangible lifting is arranged.
Table 3
| Sample number | Stainless Steel Fibre content (Vol.%) | Test frequency (MHz) | EMI shield effectiveness (dB) |
| Sample B | 15 | ????900 | ??15.17 |
| ????1800 | ??21.21 | ||
| ????1900 | ??22.09 | ||
| ????2450 | ??21.50 | ||
| Sample B ' | 15 | ????900 | ??23.77 |
| ????1800 | ??28.87 | ||
| ????1900 | ??29.79 | ||
| ????2450 | ??29.62 | ||
| Sample B " | 15 | ????900 | ??23.79 |
| ????1800 | ??30.12 | ||
| ????1900 | ??30.95 | ||
| ????2450 | ??31.62 |
It is emphasized that differently with prior art, it is used for the moulding of plastic article according to matrix material of the present invention, for example injection molding, and it need not change the existing injection moulding machine that adopts, for example existing single screw rod shaper that generally adopts.Steel fiber content is low, the macromolecular material composition is identical with the composition that was adopted in the past, and significantly, polymer composite according to the present invention is easy to be applied in the moulding of the casing of existing various electronic product and instrument.
Comprehensive above detailed description of the invention can be known the polymer composite of finding out metal fiber provided by the present invention, for the plastic article moulding, compare with prior art, its whole manufacturing cost is lower, shorten during worker, and the EMI shield effectiveness is higher.
By the above detailed description of preferred embodiments, be to wish to know more to describe feature of the present invention and spirit, and be not to come scope of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention desire application.
Claims (18)
1, a kind of granular composite material of metal fiber is characterized in that, it comprises:
A branch of steel fiber, each the root steel fiber in this bundle steel fiber becomes to be arranged in parallel in essence;
One first macromolecular material, this first macromolecular material forms a coating of each the root steel fiber in this bundle steel fiber; And
One second macromolecular material, this second macromolecular material form by a coating of this bundle steel fiber of this first macromolecular material lining.
2, matrix material as claimed in claim 1 is characterized in that, the overall volume that this bundle steel fiber accounts for this matrix material is 1%～50% than scope.
3, matrix material as claimed in claim 2 is characterized in that, the diameter range of each the root steel fiber in this bundle steel fiber is 5mm to 50mm.
4, matrix material as claimed in claim 3 is characterized in that, this matrix material is a granular composite material, and defines one first end and one second end, and wherein this bundle steel fiber extends to this second end from this first end.
5, matrix material as claimed in claim 4 is characterized in that, each the root steel fiber in this bundle steel fiber comprises a Stainless Steel Fibre and at least one metallic substance, this Stainless Steel Fibre tool magnetic diffusivity and surface-coated this at least one metallic substance.
6, matrix material as claimed in claim 5 is characterized in that, the proportional range that this at least one metallic substance is overlayed on the radius of the thickness on surface of this Stainless Steel Fibre and this Stainless Steel Fibre is 0.05 to 0.5.
7, matrix material as claimed in claim 6 is characterized in that, this at least one metallic substance comprises a metallic substance that is selected from the group that is made up of copper, nickel, silver, gold and cobalt.
8, matrix material as claimed in claim 7 is characterized in that, the surface conductivity of each root steel fiber is more than or equal to 0.08 ohm.
9, matrix material as claimed in claim 8 is characterized in that, this first macromolecular material inserts at least one couplant.
10, a kind of manufacture method of granular composite material of metal fiber is characterized in that, comprises the following step:
(a) at least one continuous metal fiber carried out a dispersion treatment;
(b) guide this at least one continuous metal fiber of dispersive immerse a lining composition of forming by one first macromolecular material, cause this first macromolecular material to form a coating of each the root steel fiber in this at least one continuous metal fiber;
(c) this at least one continuous metal fiber of this first macromolecular material of oven dry lining;
(d) this at least one continuous metal fiber of set becomes one;
(e) guide the lining composition that this burst immersion is made up of one second macromolecular material, cause this second macromolecular material to form a coating of this strand;
(f) this thigh of this second macromolecular material of oven dry lining; And
(g) cut off this strand of this second macromolecular material of lining and then obtain the granular composite material of this metal fiber.
11, method as claimed in claim 10 is characterized in that, to account for overall volume be 1% to 50% than scope to steel fiber in this granular composite material.
12, method as claimed in claim 11 is characterized in that, the diameter range of each root steel fiber is 5mm to 50mm.
13, method as claimed in claim 12 is characterized in that, each root steel fiber comprises a Stainless Steel Fibre and at least one metallic substance, this Stainless Steel Fibre tool magnetic diffusivity and surface-coated this at least one metallic substance.
14, method as claimed in claim 13 is characterized in that, the proportional range that this at least one metallic substance is overlayed on the radius of the thickness on surface of this Stainless Steel Fibre and this Stainless Steel Fibre is 0.05 to 0.5.
15, method as claimed in claim 14 is characterized in that, this at least one metallic substance comprises a metallic substance that is selected from the group that is made up of copper, nickel, silver, gold and cobalt.
16, method as claimed in claim 15 is characterized in that, the surface conductivity of each root steel fiber is more than or equal to 0.08 ohm.
17, method as claimed in claim 16 is characterized in that, further comprises the following step between step (a) and step (b):
(a1) guide this at least one continuous metal fiber of dispersive immerse a couplant, cause surface-coated this couplant of each root steel fiber;
(a2) this at least one continuous metal fiber of this couplant of oven dry lining.
18, method as claimed in claim 16 is characterized in that, this first macromolecular material inserts at least one couplant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01134255 CN1415649A (en) | 2001-10-29 | 2001-10-29 | Granular composite material containing metal fiber and its mfg. method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01134255 CN1415649A (en) | 2001-10-29 | 2001-10-29 | Granular composite material containing metal fiber and its mfg. method |
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| Publication Number | Publication Date |
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| CN1415649A true CN1415649A (en) | 2003-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 01134255 Pending CN1415649A (en) | 2001-10-29 | 2001-10-29 | Granular composite material containing metal fiber and its mfg. method |
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| CN (1) | CN1415649A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308477C (en) * | 2003-10-31 | 2007-04-04 | 烨联钢铁股份有限公司 | Rich granule iron series stainless steel with good hot work ability and antibacterial effect |
| CN101840745A (en) * | 2010-04-07 | 2010-09-22 | 湖南惠同新材料股份有限公司 | Preparation method of conductive plastics master batch containing stainless steel fibers |
| CN101151318B (en) * | 2005-03-30 | 2011-10-05 | 盖茨公司 | Metal-elastomer compound |
| CN102617986A (en) * | 2012-04-05 | 2012-08-01 | 天津大学 | Method for preparing stainless steel fiber resin matrix composite conductive plastics |
-
2001
- 2001-10-29 CN CN 01134255 patent/CN1415649A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1308477C (en) * | 2003-10-31 | 2007-04-04 | 烨联钢铁股份有限公司 | Rich granule iron series stainless steel with good hot work ability and antibacterial effect |
| CN101151318B (en) * | 2005-03-30 | 2011-10-05 | 盖茨公司 | Metal-elastomer compound |
| CN101840745A (en) * | 2010-04-07 | 2010-09-22 | 湖南惠同新材料股份有限公司 | Preparation method of conductive plastics master batch containing stainless steel fibers |
| CN102617986A (en) * | 2012-04-05 | 2012-08-01 | 天津大学 | Method for preparing stainless steel fiber resin matrix composite conductive plastics |
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