CN103757977A - Inorganic powder mica paper and preparation method and use thereof - Google Patents
Inorganic powder mica paper and preparation method and use thereof Download PDFInfo
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- CN103757977A CN103757977A CN201410001645.7A CN201410001645A CN103757977A CN 103757977 A CN103757977 A CN 103757977A CN 201410001645 A CN201410001645 A CN 201410001645A CN 103757977 A CN103757977 A CN 103757977A
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Abstract
The invention discloses an inorganic powder mica paper, comprising the following components by weight percent: 7-30% of inorganic powder, 70-93% of mica, and less than 0.3% of water-soluble heat-resisting adhesive. In conclusion, the inorganic powder mica paper provided by the invention has the characteristics of being high in heat-conducting property and good in electrical insulation property; the heat conductivity coefficient of the mica paper can be improved to over 0.8W/m.K from 0.47W/m.K. Meanwhile, the tensile strength of the inorganic powder mica paper provided by the invention is further improved, a mica belt prepared from the inorganic powder mica paper is applied to large and medium-sized high-voltage generators and motors, and reduction of the volume of the motor, increase of the capacity and prolonging of the service life are facilitated.
Description
Technical field
The invention belongs to insulating materials technical field, relate to a kind of mica paper, be specifically related to a kind of inorganic particle mica paper and its production and use.
Background technology
Mica is the general name that the layer structure nonmetallic minerals such as potassium, aluminium, magnesium, iron, lithium contain aluminosilicate, and that it has industrial value most is muscovite KAl
2(AlSi
30
10) (OH)
2with phlogopite KMg
3(AlSi
3o
10) (OH)
2.In addition, also has artificial mica synthesis KMg
3(AlSi
3o
10) F
2.
Muscovite has very high electrical insulation capability and lower dielectric loss angle tangent, and the electrical property such as arc resistant, resistance to corona; There is again the physical and chemical performances such as mechanical strength is high, high temperature resistant, corrosion-resistant; And can divide to shell into and there is flexible transparent sheet.The maximum operation (service) temperature of muscovite can reach 600 ℃.The major insulation material that is mainly used in doing large power generating equipment and high-voltage motor, is also applied in nearly all modern industry, comprises the electrical apparatus insulation of national defence and Aeronautics and Astronautics leading-edge field.
The electrical property of phlogopite is lower than muscovite, but heat resistance is higher than muscovite, and light phlogopite is heated to 1000 ℃ and just occurs above thermal expansion, thus can be 1000 ℃ of following uses, as for 800 ℃ of following fire-resistant safety wire cables of heatproof etc.
The similar phlogopite of synthetic mica chemical constitution, maximum operation (service) temperature can reach 1100 ℃, as for temperature at fire-resistant safety wire cable below 1000 ℃ etc.
Above three kinds of micas can be processed into high-temperature insulation material and other industrial materials such as mica sheet, mica powder, mica paper, mica tape, micarex.
The manufacture of domestic mica paper is that to take the mica flake of muscovite or phlogopite or synthetic mica be raw material, with chemical pulping or hydraulic slurrying, on cylinder mould machine, with the slower speed of a motor vehicle, manufacture paper with pulp into calcinated type mica paper or non-calcinated type mica paper paper roll, then through cutting reel mica paper or the dull and stereotyped mica paper forming.
Heat-conducting insulation material is a kind of conventional functional material, conventionally with forms such as pottery, plastics, rubber, adhesive, coating, be widely used in microelectronics Packaging, motor, automobile, special cable, high-end Aero-Space military field etc., in modern high-tech field, have good application prospect.
In power industry, large and medium-sized high-voltage generator, motor can produce a large amount of heat in running, if derived not in time, to directly affect its operating efficiency, shorten the life-span, reduce its reliability, therefore motor conducts heat has become modern electrical machine technology urgent problem, is also the study hotspot of countries in the world insulating material.
We know, the major insulation of motor by after the wrapped resin-rich mica tape of motor coil by hot moulding curing process or to completing by vacuum pressure mass-impregnation (VPI) technique after the wrapped low resin mica tape of motor coil.Wherein, mica tape is the material of most critical, and it is to be comprised of mica paper (thermal conductivity factor 0.47～0.51W/mK), glass cloth (thermal conductivity factor 0.8～1.2W/mK) and adhesive (as epoxy adhesive, thermal conductivity factor 0.17～0.22W/mK) conventionally.Say on a macro scale, motor consists of metal material and insulating materials exactly.For insulating materials, owing to there is no the motion of electron stream, their thermal conductivity differs 500～1000 times than metal material.Therefore, the heat conductivility of raising insulating materials is the important channel of improving motor heat-conductive characteristic in service.
Because most of insulating polymeric materials are adiabatic substantially, its thermal conductivity factor is generally at 0.15～0.25W/mK, if epoxy glue is 0.2W/mK, silica gel 0.21W/mK, paulownia horse glue 0.18W/mK, catechol glutol 0.209W/mK, polytetrafluoroethylene (PTFE) 0.25W/mK ... generally can not remove to improve with macromolecular material the heat conductivility of insulating materials.
Correlative study shows: insulating materials thermal conductivity factor is brought up to 0.4W/mK from 0.25W/mK, and output power of motor will promote nearly 10%; For the air cooled generator of same size, in same temperature rise situation, if adopt high heat conductive insulating material can make one times of the highest lifting of its capacity.
How a kind of heat conduction mica paper is provided, and is the focus of current this area research.
Summary of the invention
The object of the invention is to solve the existing high-voltage motor heat conducting deficiency that is in operation, provide a kind of and obtain heat conduction mica paper by add inorganic particle in mica paper.The mica paper making has heat conductivility height and the good feature of electrical insulation properties.
Another object of the present invention is to provide a kind of preparation method of above-mentioned inorganic particle mica paper.
A further object of the present invention is to provide a kind of above-mentioned inorganic particle mica paper in the application in mica tape at high-voltage generator and motor.
For achieving the above object, the technical scheme that the present invention takes is: a kind of inorganic particle mica paper is provided, it is characterized in that, comprise the component of following percentage by weight: 7%～30% inorganic particle; 70%～93% mica; Be less than 0.3% water-soluble high-temperature resistance adhesive.
Inorganic particle can be Al
2o
3, AlN, SiO
2, MgO, SiC, BN, ZnO
w, Si
3n
4in at least one.
Water-soluble high-temperature resistance adhesive can be soluble epoxide adhesive or water-soluble organic silicon adhesive.
The soluble epoxide adhesive adopting in present specification, model is MU-618, is purchased from Shanghai Fu Lang chemical science and technology Development Co., Ltd.
The water-soluble organic silicon adhesive adopting in present specification, model is T19, is purchased from Shenzhen Han Long Science and Technology Development Co., Ltd..
Preferably, mica is muscovite.
The present invention also provides a kind of preparation method of inorganic particle mica paper, comprises the following steps:
Step a, the preparation of mica slurry: the raw material by after choosing and cleaning, through hydraulic crushing and beating, obtains mica flake; The mica flake obtaining is divided into-8 order～+ 60 orders and-60 orders～+ 180 order two parts with dehydration screen cloth; The mass concentration of these two-part slurries can be controlled at 36% left and right, but this concentration does not have how many impacts for the present invention, and the slurries of other mass concentrations also can be used.
The raw material of choosing in step a refers to that to choose area be 2cm
2～7cm
2, the mica sheet that thickness is 2mm～5mm is raw material, mica sheet size evenly, is conducive to making beating; Mica is muscovite.Can first use mechanical picker and hand picking, remove the exogenous impurities such as dust, quartz sand, tree root and scale mica, weathering mica, blotchy mica etc.Scale mica refers to that mica is subject to water logging erosion, the moisture absorption and air oxidation for a long time, and the FeO in mica crystal becomes Fe
2o
3, or near being subject to, iron ore becomes rusty water erosion institute extremely, and the redness of the skin or complexion spot occurring.Blotchy mica refers to that spot point footpath in mica sheet is greater than the mica of 3mm and comparatively dense.Weathering mica refers to long-term outdoor the banking up of mica, is subject to air, water, sunlight and other factors effect, its quality is fluffed soft, and nonelastic, partial properties changes.Exogenous impurity mainly refers in ore dressing, transportation, mix into wood chip, bamboo bits, charcoal, shredded paper, cloth waste, pericarp, hair, iron nail, iron wire, braid over braid fiber etc.
Cleaning raw material in step a comprises slightly to be washed and two processes of fine purifiation: slightly wash the mica flake referring to choosing and be placed in flotation cell, the flotation cell inventory of every cubic metre of volume is not more than 70Kg, rate of feeding is not more than 280Kg/h, add water agitator treating at least twice, then drop into material washing machine fine purifiation at least one times.After fine purifiation completes, sample and test.Mica flake after cleaning is put into the clear water of 4～5 times of mica flake quality, after stirring, water intaking checks that turbidity is not more than 12 °, and free from admixture be considered as qualified.
Mechanical Crushing making beating in step a refers to, can adopt 5 belt material deliverings with the speed of 0.4Kg/min left and right, mica flake to be sent in 5 pulpers respectively, with high-pressure hydraulic, mica sheet is broken into mica flake, and the pressure of water is 5.5～6.0MPa.And then inversion half trapezoidal flume through being connected as a single entity with pulper is with 10m
3the supply waterpower of/h is carried out gravity floatation.Wherein, mica flake radius-thickness ratio is little, and large mica splitting sinks to trapezoidal flume bottom and carries out high-pressure hydraulic fragmentation again, and what the large scale size of radius-thickness ratio was suitable overflows from trapezoidal flume top overfall.Through 8 order～16 object filter residues, screen out thick slag and mica sheets more than 8 orders again; Mica flake below 8 orders filters through 60 order～90 eye mesh screens, obtains-8 orders～+ (60-90) thick magma of order, and remaining liquid is again through 120 order～180 object screen filtrations, obtains-60 orders～+ (120-180) thin magma of object.Mica flake and water after dewatering screen filters are mixed into virgin pulp liquid, and the concentration of mica flake can be controlled at 36% left and right.By-8 orders～+ (60-90) the thick slurry of object and-60 orders～+ (120-180) object screened stock, with pipeline, be transported to respectively two deckered stock chests standby.
Step b, activated inorganic powder: activation processing is carried out in the surface of inorganic particle with coupling agent; The particle diameter of inorganic particle can be 60 order～180 orders, and coupling agent is silane coupler or chelating titanate coupling agent.Inorganic particle can be Al
2o
3, AlN, SiO
2, MgO, BN, SiC, ZnO
w, Si
3n
4in at least one.
The silane coupler adopting in present specification, model is KH-550 or KH-560, is purchased from Nanjing Pin Ning coupling agent Co., Ltd.
The chelating titanate coupling agent adopting in present specification, model is TM-200S, is purchased from Yizheng Tian Yang Chemical Co., Ltd..
Step c, with slurry :-8 orders～+ 60 object mica magma water is mixed with to the thick slurry that mass concentration is less than 1%; Inorganic particle by-60 orders～+ 180 object mica magma and after processing is according to solid matter mass ratio (0～1): 1 water is mixed with the screened stock that mass concentration is less than 1%, and adds water-soluble high-temperature resistance adhesive in screened stock.Water-soluble high-temperature resistance adhesive, refers to that operating temperature is not less than 155 ℃ (meeting F level and above heat-resisting requirement), and should be compatible with the adhesive in mica tape with motor.This water-soluble high-temperature resistance adhesive can be soluble epoxide adhesive, water-soluble polyamine-acid imide adhesive or water-soluble organic silicon adhesive.
Steps d, copy paper: above-mentioned screened stock and thick slurry are adopted to the cylinder mould machine moulding of manufacturing paper with pulp, through squeezing, dry, obtain inorganic particle mica paper.
In steps d, copy paper refers to, is superimposed on one by one on felt respectively from a plurality of cylinder moulds of cylinder mould machine slurries out after cylinder drainage, forms l Water Paper base, and l Water Paper base, through squeezing, dry, obtains inorganic particle mica paper; Described l Water Paper blank structure is middle thick slurry layer, the composite construction of upper and lower faces screened stock layer.
For example, paper machine can adopt 5 cylinder mould cylinder mould machines.Screened stock is piped in the stock tank of the 1st and the 5th cylinder mould of papermaking; To slightly starch in the stock tank of the 2nd, 3, the 4 middle several cylinder moulds that are piped to papermaking.Felt in paper machine system in accordance with regulations direction motion drives 5 cylinders to press equidirectional rotation.The rotation of cylinder is mica lodicule or granule band top felt, after the lodicule (or granule) the from the 1st to the 5th cylinder mould band is superimposed on felt one by one, forms two sides screened stock sheet (particle), the l Water Paper base of lodicule broad in the middle on felt.L Water Paper base is after pressure roller squeezing, and l Water Paper base is transferred on steam-heated drying cylinder and is dried, and after rolling, trimming on cutting machine, gets product.
The quantity of cylinder mould in the middle of the manufacture of thin paper can reduce.The quantity of cylinder mould in the middle of the manufacture of ground paper can increase.
In the present invention, for inorganic particle is uniformly dispersed in cylinder stock tank, in stock tank, do not precipitate, hydrodynamic(al) dispersal device can be installed in cylinder stock tank bottom.
In the present invention, introduce heat conduction inorganic particle in mica paper, than adding inorganic particle merely in mica tape glue, be more conducive to heat conduction particle in mica tape solidfied material and form heat conduction network chain, the propagation along passage of heat goes out thermal conductance by phonon to be conducive to heat.
In the present invention, than r-Al
2o
3, a-Al
2o
3to mica tape solidfied material thermal conductivity factor, promote higher; Than micropore SiO
2, spherical SiO
2to mica tape solidfied material thermal conductivity factor, promote higher; When powder content is lower in mica tape, bar-shaped r-Al
2o
3powder is more outstanding in raising mica tape solidfied material thermal conductivity.
In the present invention, in mica solidfied material, work as Al
2o
3content reaches at 1/3 o'clock, and the thermal conductivity factor of profiled insulation rises to 0.5W/mK by 0.2W/mK.But from glue, add inorganic particle, have powder sedimentation in glue, roll banding, layering, glue amount is on the low side, the series of problems such as not Easy Test of gel time, from mica paper, add heat conduction inorganic particle, many again approach that inorganic particle adds, thus improve the content of heat conduction powder in mica tape.
The thermal conductivity factor of inorganic heat conduction powder insulate in the present invention: Al
2o
3be 25～40W/mK; AlN is 80～320W/mK; BN(hexahedron) be 40～120W/mK; Si
3n
4be 16～58W/mK; MgO is 25～50W/mK; BN(cube) be 1300W/mK; ZnO is 20W/mK.Conventionally, add the inorganic particle of high thermal conductivity coefficient, be more conducive to improve the thermal conductivity factor of mica tape solidfied material.
In sum, inorganic particle mica paper provided by the invention has the high and good feature of electrical insulation properties of heat conductivility, the thermal conductivity factor of mica paper can from 0.47W/mK bring up to 0.8W/mK and more than.Meanwhile, the tensile strength of inorganic particle mica paper provided by the invention has also obtained further raising.The mica tape that inorganic particle mica paper is made is applied to large and medium-sized high-voltage generator and motor, is conducive to motor reduced volume, capacity increasing, life-extending.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present application, forms the application's a part, and the application's schematic description and description is used for explaining the application, does not form the improper restriction to the application.In the accompanying drawings:
Fig. 1 schematically shows the inorganic particle mica paper sectional schematic diagram according to an embodiment of the application.
In these accompanying drawings, with identical reference number, represent same or analogous part.
The specific embodiment
For making the application's object, technical scheme and advantage clearer, below in conjunction with specific embodiment, the application is described in further detail.
For the sake of simplicity, omitted in below describing and well known to a person skilled in the art some technical characterictic.
Embodiment 1
Selected high quality white mica is raw material, and mica sheet area is 3cm
2left and right, thickness is 2mm～5mm.Scale mica, weathering mica, blotchy mica, ore and exogenous impurity in raw material, have not been allowed.Raw material is dropped into floation tank and slightly wash, the floation tank inventory of every cubic metre of volume is not more than 70Kg, constantly in pond, adds water, constantly stirs stirring, and light impurity is gone by water surface floating, slightly must not wash and is less than 2 times.Raw material after slightly washing is dropped into the material washing machine water fine purifiation of rotary drum, inventory≤280Kg/h.By 5 belt material deliverings for washed mica raw material, with the speed of 0.4Kg/min, mica raw material is sent in 5 pulpers respectively, with high-pressure hydraulic, mica raw material is broken into mica flake, the pressure of water is 5.9MPa.And then the inverted half trapezoidal tank through being connected as a single entity with pulper is with 10m
3the supply waterpower of/h is carried out gravity floatation.Wherein, the little and heavy large mica splitting of mica flake radius-thickness ratio sinks to trapezoidal flume bottom and carries out high-pressure hydraulic fragmentation again; Large and suitable the overflowing from trapezoidal flume top overfall of scale size of radius-thickness ratio.Through 14 orders, every ballast screen, remove thick slag mica and large impurity more than 14 orders again; Then through 60 object scalpings, filter, obtain the thick magma of-14 order～+ 60 object, remaining liquid filters through 150 object dusting covers again, obtains the thin magma of-60 order～+ 150 object.The concentration of mica flake in water is in 32% left and right.Thick slurry and screened stock respectively two deckered stock chests of nature inflow are standby.Before slurrying with 2% KH-560 to 60 order～150 object Al
2o
3powder carries out surface activation process, dry rear standby.In two stock proportioners, carry out respectively dynamically with slurry: in a stock proportioner, object thick magma water in-14 orders～+ 60 is mixed with therein to the mica slurries of <1%, under dynamic equilibrium, utilizes potential difference slurries to be transported to respectively with pipeline in the stock tank of the 2nd, 3,4 cylinders of 5 cylinders of paper machine; Al at another stock proportioner by-60 orders～+ 150 order mica magma and after processing
2o
3inorganic particle is with 0.4:1(solid matter parts by mass) the dynamic equilibrium of ratio water under be made into the slurries of ﹤ 1%, containing water-soluble high temperature resistant epoxy adhesive in slurries (consumption is advisable with 0.3% of≤mica paper), utilizes potential difference the mixed serum preparing to be transported to respectively with pipeline in the stock tank of the 1st, the 5th cylinder of 5 cylinders of paper machine.The anti-settler of hydrodynamic(al) is arranged at the bottom of cylinder stock tank.5 cylinders are superimposed on sequentially on the felt of paper machine with sizing liquor simultaneously after cylinder drainage, form the l Water Paper base of two outside screened stock sheets (or particle), middle thick lodicule, again through squeezing, cylinder dried, rolling, trimming, thereby obtain adding the heat conduction mica paper of inorganic particle.This mica paper had both kept the specification requirement with mica paper with mica tape of original motor, and the thermal conductivity factor of mica paper has been brought up to 0.8W/mK by original 0.47W/mK simultaneously.
Selected high quality white mica is raw material, and mica sheet area is 3cm
2left and right, thickness is 2mm～5mm.Scale mica, weathering mica, blotchy mica, ore and exogenous impurity in raw material, have not been allowed.Raw material is dropped into floation tank and slightly wash, the floation tank inventory of every cubic metre of volume is not more than 70Kg, adds water and stirs, and slightly must not wash and is less than 2 times.Then at material washing machine fine purifiation, inventory≤280Kg/h.By 5 belt material deliverings for washed mica raw material, with the speed of 0.4Kg/min, mica raw material is sent in 5 pulpers respectively, with high-pressure hydraulic, mica raw material is broken into mica flake, the pressure of water is 5.7MPa.Use 11m
3the supply waterpower of/h is carried out after gravity floatation, crosses 12 orders and removes large mica splitting and impurity every ballast screen; With 80 object scalpings, filter, obtain the thick magma of-12 order～+ 80 object, remaining liquid filters through 160 object dusting covers again, obtains the thin magma of-80 order～+ 160 object.The concentration of mica flake in water is 36%.Thick magma and thin magma are utilized potential difference, and two deckered stock chests of nature inflow are standby respectively.Before slurrying, with 4% the p-80 order～160 object AlN in KH-550, carry out activation processing, dry rear standby.In two stock proportioners, carry out respectively with slurry: in a stock proportioner, object thick magma water in-14 orders～+ 80 is mixed with therein to the mica slurries of < 1%, with pipeline, is transported to respectively in the stock tank of the 2nd, 3,4 cylinders of cylinder; AlN inorganic particle at another stock proportioner by-80 orders～+ 160 order mica magma and after processing is with 0.6:1.0(solid matter parts by mass) ratio water be made into the slurries of < 1%, slurries containing water-soluble high temperature resistant epoxy adhesive (consumption with in mica paper≤0.3% be advisable), utilizes potential difference that the mixed serum preparing is transported to respectively in the stock tank of the 1st, the 5th cylinder of paper machine with pipeline.The anti-settler of hydrodynamic(al) is arranged at the bottom of cylinder stock tank.5 cylinders are superimposed on sequentially on the felt of paper machine with sizing liquor simultaneously after cylinder drainage, form the l Water Paper base of two outside screened stock sheets (or particle), middle thick lodicule, again through squeezing, cylinder dried, rolling, trimming, thereby obtain adding the heat conduction mica paper of inorganic particle.This mica paper had both kept the specification requirement with mica paper with mica tape of original motor, and the thermal conductivity factor of mica paper has been brought up to 1.2W/mK by original 0.47W/mK simultaneously.
Embodiment 3
Selected high quality white mica is raw material, and mica sheet area is 3cm
2left and right, thickness is 2mm～5mm.Scale mica, weathering mica, blotchy mica, ore and exogenous impurity in raw material, have not been allowed.Raw material is dropped into floation tank and slightly wash, the floation tank inventory of every cubic metre of volume is not more than 70Kg, constantly adds water and stirs, and slightly must not wash and is less than 2 times.Then drop into material washing machine water fine purifiation, inventory≤280Kg/h.With the speed of 0.4Kg/min, mica raw material is sent in 5 pulpers respectively, with high-pressure hydraulic, mica raw material is broken into mica flake, the pressure of water is 5.9MPa.Use 10m
3the supply waterpower of/h is carried out after gravity floatation, crosses 14 orders and removes large mica splitting and impurity every ballast screen; With 60 object scalpings, filter, obtain the thick magma of-14 order～+ 60 object, remaining liquid filters through 150 object dusting covers again, obtains the thin magma of-60 order～+ 150 object.The concentration of mica flake in water is 37%, and it is standby that thick magma and thin magma utilize potential difference difference nature to flow into two deckered stock chests.Before slurrying, with 3% KH-560,60 order～150 object MgO are carried out to activation processing, dry rear standby.In two stock proportioners, carry out respectively with slurry: in a stock proportioner, object thick magma water in-14 orders～+ 60 is mixed with therein to the mica slurries of ﹤ 1%, with pipeline, is transported to respectively in the stock tank of the 2nd, 3,4 cylinders of cylinder; MgO powder at another stock proportioner by-60 orders～+ 150 order mica magma and after processing is with 0.4:1.0(solid matter parts by mass) the dynamic equilibrium of ratio water under be made into the slurries of < 1%, containing water-soluble high temperature resistant silicone adhesives in slurries (consumption is advisable with 0.3% of≤mica paper), utilizes potential difference that the mixed serum preparing is transported to respectively in the stock tank of the 1st, the 5th cylinder of paper machine with pipeline.The anti-settler of hydrodynamic(al) is arranged at the bottom of cylinder stock tank.5 cylinders are superimposed on sequentially on the felt of paper machine with sizing liquor simultaneously after cylinder drainage, form the l Water Paper base of two outside screened stock sheets (or particle), middle thick lodicule, again through squeezing, cylinder dried, rolling, trimming, thereby obtain adding the heat conduction mica paper of inorganic particle.This mica paper had both kept the specification requirement with mica paper with mica tape of original motor, and the thermal conductivity factor of mica paper has been brought up to 0.9W/mK by original 0.47W/mK simultaneously.
As shown in Figure 1, centre is thick lodicule layer 2 to the mica paper structure making by embodiment 1～3, and both sides are screened stock lamella 1.Between each layer, without any need for adhesive, mainly by the vacuum state between intermolecular active force and mica flake, become paper, eliminated the possibility because of the bonding bad layering of adhesive.
Comparative example 1:
Selected high quality white mica is raw material, and mica sheet area is 3cm
2left and right, thickness is 2mm～5mm.Scale mica, weathering mica, blotchy mica, ore and exogenous impurity in raw material, have not been allowed.Raw material is dropped into floation tank and slightly wash, the floation tank inventory of every cubic metre of volume is not more than 70Kg, constantly adds water and stirs, and slightly must not wash and is less than 2 times.Then drop into material washing machine water fine purifiation, inventory≤280Kg/h.With the speed of 0.4Kg/min, mica raw material is sent in 5 pulpers respectively, with high-pressure hydraulic, mica raw material is broken into mica flake, the pressure of water is 5.9MPa.Use 10m
3the supply waterpower of/h is carried out after gravity floatation, crosses 14 orders and removes large mica splitting and impurity every ballast screen; With 60 object scalpings, filter, obtain the thick magma of-14 order～+ 60 object, remaining liquid filters through 150 object dusting covers again, obtains the thin magma of-60 order～+ 150 object.The concentration of mica flake in water is 37%, and it is standby that thick magma and thin magma utilize potential difference difference nature to flow into two deckered stock chests.In stock proportioner, water is made into magma in the mica slurries of ﹤ 1%, with pipeline, mica slurry is transported in 5 cylinder stock tanks of paper machine.5 cylinders simultaneously with on slurries after cylinder drainage, be superimposed on sequentially on the felt of paper machine, (screened stock on the 1st and the 5th cylinder; 2nd, on the 3rd, the 4th cylinder, slightly starch) form l Water Paper base, then through squeezing, cylinder dried, rolling, trimming, thereby obtain the mica paper that high-voltage motor is used with mica tape.
Comparative example 2:
Selected high quality white mica is raw material, and mica sheet area is 3cm
2left and right, thickness is 2mm～5mm.Scale mica, weathering mica, blotchy mica, ore and exogenous impurity in raw material, have not been allowed.Raw material is dropped into floation tank and slightly wash, the floation tank inventory of every cubic metre of volume is not more than 70Kg, constantly adds water and stirs, and slightly must not wash and is less than 2 times.Then drop into material washing machine water fine purifiation, inventory≤280Kg/h.With the speed of 0.4Kg/min, mica raw material is sent in 6 pulpers respectively, with high-pressure hydraulic, mica raw material is broken into mica flake, the pressure of water is 5.8MPa.Use 10M
3the supply waterpower of/h is carried out after gravity floatation, crosses 14 orders and removes large mica splitting and impurity every ballast screen; With 150 object screen filtrations, obtain-14 order～+ 150 object magma of 38% concentration.The Al of water by magma and after processing in stock proportioner
2o
3powder is with 0.16:1.0(solid matter parts by mass) the dynamic equilibrium of ratio water under be made into the slurries of < 1%, with pipeline, mica slurry is transported in 5 cylinder stock tanks of paper machine.5 cylinders simultaneously with on slurries after cylinder drainage, be superimposed on sequentially on the felt of paper machine, form l Water Paper base, then through squeezing, cylinder dried, rolling, trimming, thereby obtain the mica paper that high-voltage motor is used with mica tape.
Embodiment 1-3 and comparative example mica paper performance data are in Table 1.
Table 1 embodiment 1-3 and comparative example mica paper performance data
Note: embodiment 1-3 is the mica paper that adds heat conduction powder; Comparative example is not for adding the mica paper of heat conduction powder.
Performance data from table 1 can be found out: embodiment 1-3 is with respect to comparative example 1, the heat conductivility that has added the mica paper of inorganic particle is significantly improved with the heat conductivility that does not add the mica paper of inorganic particle, and similar with machinery and the electric property of mica paper that does not add inorganic particle; Also can find out the embodiment 2 that inorganic particle thermal conductivity factor is high, the thermal conductivity factor of its mica paper is also high simultaneously.Embodiment 1-3 is with respect to the traditional mixed sizing process of comparative example 2(), adopt the tensile strength of mica paper prepared by technique of the present invention to be significantly improved, while dielectric strength has also obtained obvious lifting.
In sum, adopt a kind of mica paper that adds inorganic particle of the inventive method production, both kept the mechanical electric performance of original mica paper, and good heat conductivity.
The embodiment that the foregoing is only the application, is not limited to the application, and for a person skilled in the art, the application can have various modifications and variations.All within the application's spirit and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in the application's claim scope.
Claims (10)
1. an inorganic particle mica paper, is characterized in that, comprises the component of following percentage by weight: 7%～30% inorganic particle; 70%～93% mica; Be less than 0.3% water-soluble high-temperature resistance adhesive.
2. inorganic particle mica paper according to claim 1, is characterized in that, described inorganic particle is Al
2o
3, AlN, SiO
2, MgO, SiC, BN, ZnO
w, Si
3n
4in at least one.
3. inorganic particle mica paper according to claim 1, is characterized in that, described water-soluble high-temperature resistance adhesive is soluble epoxide adhesive or water-soluble organic silicon adhesive.
4. a preparation method for inorganic particle mica paper, is characterized in that, comprises the following steps:
Step a, the preparation of mica slurry: the raw material by after choosing and cleaning, through hydraulic crushing and beating, obtains mica flake; The mica flake obtaining is divided into-8 order～+ 60 orders and-60 orders～+ 180 order two parts with dehydration screen cloth;
Step b, activated inorganic powder: activation processing is carried out in the surface of inorganic particle with coupling agent;
Step c, with slurry :-8 orders～+ 60 object mica magma water is mixed with to the thick slurry that mass concentration is less than 1%; Inorganic particle by-60 orders～+ 180 object mica magma and after processing is according to solid matter mass ratio (0～1): 1 water is mixed with the screened stock that mass concentration is less than 1%, and adds water-soluble high-temperature resistance adhesive in screened stock;
Steps d, copy paper: above-mentioned screened stock and thick slurry are adopted to the cylinder mould machine moulding of manufacturing paper with pulp, through squeezing, dry, obtain inorganic particle mica paper.
5. the preparation method of inorganic particle mica paper according to claim 4, is characterized in that, the raw material of choosing in described step a refers to that to choose area be 2cm
2～7cm
2, the mica sheet that thickness is 2mm～5mm is raw material; Described mica is muscovite.
6. the preparation method of inorganic particle mica paper according to claim 4, it is characterized in that, cleaning raw material in described step a refers to, the raw material of choosing is placed in to flotation cell, the flotation cell inventory of every cubic metre of volume is not more than 70Kg, rate of feeding is not more than 280Kg/h, adds water agitator treating at least twice, then drops into material washing machine and clean at least one times.
7. the preparation method of inorganic particle mica paper according to claim 4, it is characterized in that, Mechanical Crushing making beating in described step a refers to, to in the mica input pulper after cleaning, by the waterpower that pressure is 5.5Mpa～6.0Mpa, mica sheet be broken into mica flake, through tank, carry out gravity floatation again, after filtering with 8 order～14 orders, 60 order～80 orders, 120 order～180 object dewatering screens, dehydration 60%～70%, the mica flake obtaining is of a size of-8 order～+ 180 orders.
8. the preparation method of inorganic particle mica paper according to claim 4, is characterized in that, the particle diameter of described inorganic particle is 60 order～180 orders, and coupling agent is silane coupler or chelating titanate coupling agent.
9. the preparation method of inorganic particle mica paper according to claim 4, it is characterized in that, described copy paper refers to, from a plurality of cylinder moulds of cylinder mould machine slurries out, after cylinder drainage, be superimposed on one by one on felt respectively, form l Water Paper base, l Water Paper base, through squeezing, dry, obtains inorganic particle mica paper; Described l Water Paper blank structure is middle thick slurry layer, the composite construction of upper and lower faces screened stock layer.
10. the arbitrary described inorganic particle mica paper of claim 1-3 is in high-voltage generator and the application in mica tape for motor.
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