CN107167268A - Resistance with pressure change pressure sensor - Google Patents
Resistance with pressure change pressure sensor Download PDFInfo
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- CN107167268A CN107167268A CN201710460819.XA CN201710460819A CN107167268A CN 107167268 A CN107167268 A CN 107167268A CN 201710460819 A CN201710460819 A CN 201710460819A CN 107167268 A CN107167268 A CN 107167268A
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- pulp layer
- layer
- carbon
- carbon pulp
- pressure sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
Abstract
A kind of resistance with pressure change pressure sensor, including the contact carbon pulp layer of a pair of pet layers, the silver slurry layer being separately positioned on each pet layer, the silver paste for covering layer bonded by two-sided tape, the two-sided tape contacted between carbon pulp layer is provided with hollow structure, carbon pulp layer is contacted provided with interval carbon pulp layer, is characterized in that：The interval carbon pulp layer is provided with grid.It has the advantages that rational in infrastructure, pressure sensitivity data output precision height, low cost, service life length, applied widely.
Description
Technical field
The present invention relates to thin film switch sensor field, specifically a kind of resistance with pressure change pressure sensor.
Background technology
Most of existing thin film switch product belongs to single resistance value output type, i.e., when pressure reaches minimum
The resistance of thin film switch is by disconnecting（Infinite）To connection（Produce certain resistance value）, resistance value will not be with pressure
Increase and change or knots modification very little.And this kind of thin film switch is applied to sensor field, it is basic that the sensor is exported
It is single logical ＆ break signals, it is impossible to which realize needs resistance value corresponding thereto to export for different pressures, that is, realizes real meaning
The output of the pressure sensitivity data of justice.For example, the intelligent running shoe-pad that the scientific ＆ technical corporation that runs releases in June, 2016, although sensing
The sensing unit of device is arranged on sole main pressure point such as five toes and heel etc., but the pressure sensitivity number of each sensing unit
It is single according to output valve, it is impossible to which that whether recognize wearer is same people.If above-mentioned technical proposal is used for into Intelligent worn device, work(
Can be excessively single.In addition, people can cause great temporary impact when running to sole, for existing thin film switch sensor
For structure, the impulsive force easily causes the fracture of silver slurry layer, causes data unstable, and the service life of the product was at 1 year or so
Shortcoming.
The content of the invention
It is an object of the invention to provide a kind of pressure sensor of resistance with pressure change, above-mentioned ask fundamentally is solved
Topic, it has the advantages that rational in infrastructure, pressure sensitivity data output precision height, low cost, service life length, applied widely.
To achieve the above object, the invention provides following technical scheme：The resistance with pressure change pressure sensor
Including the contact of a pair of pet layers, the silver slurry layer being separately positioned on each pet layer, the silver paste for covering layer bonded by two-sided tape
Two-sided tape between carbon pulp layer, contact carbon pulp layer is provided with hollow structure, and contact carbon pulp layer is provided with interval carbon pulp layer, its technology
Main points are：The interval carbon pulp layer is provided with grid.
Further, the grid is distributed in the carbon pulp layer of interval.
Further, provided with protection carbon pulp layer between silver paste layer and pet layer.
Further, the protection carbon pulp layer or interval carbon pulp layer are prepared from by following raw material according to percentage by weight：
3 ~ 5wt% of coiled carbon fibers；18 ~ 20wt% of conductive black；2 ~ 5wt% of expanded graphite；Silica 1 ~ 2wt%；10 ~ 25wt% of resin；
42 ~ 64wt% of resin solvent；0.2 ~ 1wt% of auxiliary agent；
Resin is selected from thermoplastic polyurethane（TPU）, polyurethane（PU）Or natural emulsion（NR）One or more of；
Resin solvent is selected from more than one of dimethylformamide, cyclohexanone, butanone, dibasic ester, n-propyl acetate or water；
Auxiliary agent is selected from more than one of 0.2 ~ 0.3wt% of 0.2 ~ 0.3wt% of dispersant or levelling infusion；Dispersant is selected from linear alkyl
Amide-type or branch type polycarboxylic acid, sodium laurate, polyvinyl alcohol, polyethylene glycol monolaurate more than one；Levelling froth breaking
Agent is selected from Siloxane-Oxyalkylene Copolymers.
Further, the weight ratio of the coiled carbon fibers, conductive black, expanded graphite and resin is 1.2 ~ 5.0：4.0~
10.0：0.8~5.0：10.0.
Present invention also offers a kind of resistance with the interval carbon pulp layer of the pressure sensor of pressure change or protection carbon pulp layer
Preparation method, be characterized in that, comprise the following steps：
Step 1）Resin is completely dissolved in solvent, under rotating speed >=2000rpm stirring conditions, silica is sequentially added,
Auxiliary agent, conductive helical carbon fiber, conductive black, expanded graphite；
Step 2）Conductive helical carbon fiber prepares coiled carbon fibers using general catalyzing acetylene pyrolysismethod, then 2000 DEG C of graphite
Change is handled；
Step 3）≤ 60 μm are ground to through three-roll grinder after component is well mixed, then is obtained with ball mill grinding to≤30 μm
To 30 ~ 50PaS of viscosity ink.
Invention additionally provides using footwear of the above-mentioned resistance with the pressure sensor of pressure change, including some it is arranged on
Sensing unit in wherein one footwear, sensing unit include by two-sided tape bond a pair of pet layers, be separately positioned on respectively
Two-sided tape between silver slurry layer, the contact carbon pulp layer of silver paste for covering layer on pet layer, contact carbon pulp layer is provided with hollow structure,
Carbon pulp layer is characterized in that provided with interval carbon pulp layer：The interval carbon pulp layer is provided with grid, and silver slurry layer is provided with some
Magnetic induction loop is simultaneously connected with rectification module and power module, and the magnetic of some magnetic field line cutting magnetic induction coils is provided with another footwear
Bar.
Further, the pressure sensor structure is separately positioned on position corresponding with tiptoe, arch of the foot or/and heel
On.Tiptoe specifically may include five regions, i.e. first metatarsal bone region, second and os metatarsale tertium head region, first
Metatarsal root region, os metatarsale tertium root region and fifth metatarsal bone root region；Arch of the foot specifically refers to cuboid
Region；Heel specifically refers to heel bone region.
Beneficial effects of the present invention：And grid cell is set in relevant position according to foot, then can be according to stress position
Matching relationship between the difference put, forced position output current, output total current and corresponding time circulation point etc. this
A little pressure sensitivity data obtain unique identity information, so as to be used as the test side of identity recognition device.For example, in tiptoe, arch of the foot
It is provided with the sensing unit of network respectively with heel portion, someone walks or running posture hair in special time unit
It is raw to change, then the active force that the specific sensing unit position of specific sensor can periodically be applied by people foot, so that special
This group of output current A1 ~ An, total output current I and time quantum particular point in time T1 ~ Tn is circulated on fixed sensing unit
Data are in cyclically-varying, and by setting adaptation function f（T）=aAn*bI*cTn, then can obtain using time T as abscissa, with
F (T) is the indicatrix of ordinate.Pass through the different chronological cyclic loading feelings in sensing unit position of detection sensor
Condition, you can influence of the different walking postures to foot bottom stress is obtained, so as to obtain unique identity.
Further, people is typically to be contacted according to the order of heel, arch of the foot, tiptoe with ground, according to pin when on foot
Leave ground to complete circulation of once marking time with, the order of arch of the foot, tiptoe.And according to body weight, foot size, leg flesh
The difference of meat, custom etc. of walking, can cause foot ad-hoc location to the Subtle differences of midsole compression.In running, on following
State outside rule, foot is to ground to lower punch power, sole（Heel, arch of the foot, tiptoe）Differed with the contact area of sole.And
Using existing sensing unit, it is typically only capable to detect single signal, for example, detects what is contacted in particular point in time with ground
Foot position.If wanting to export a variety of current signals, need to set the sensing unit of a myriad of, thus result in the need for the letter of complexity
Number reception system and high manufacturing cost, and due to the limitation of sensing unit minimum area, it is difficult to accomplish that accurate signal is defeated
Go out.As shown in figure 4, for example applying pressure in the upper left corner of a certain sensing unit, thin film switch of the prior art is then with upper left
Angle be center of effort to edge-diffusion, the contact carbon pulp layer in portion of center of effort is completely attached to, the contact carbon at center of effort's outer rim
Exposure level is gradually reduced pulp layer from inside to outside, is changed although thus will not actually produce in theory according to stress degree
Current signal, and can not accurately determine actual loading size, due to the unconquerable factor of thin flexible film, will necessarily exist
Maximum error, it is impossible to this high-precision purposes for identification.
The present invention only by being provided with the interval carbon pulp layer of network between the contact carbon pulp layer of sensing unit,
On the premise of hardly changing manufacturing cost, deforming contact when the contact carbon slurry at grid is squeezed, you can be substantially reduced
The constant interval of output signal, improves precision.Although part contact carbon pulp layer can not be contacted due to the barrier of grid, not shadow
Ring the sensing unit and export different current signals.In addition, by the setting of network interval carbon pulp layer, network will foot
The impulsive force in portion is disperseed, so as to improve the toughness of silver slurry layer and contact carbon pulp layer.
Further, in the formula of interval carbon pulp layer, 3 ~ 5wt% of coiled carbon fibers consumption can effectively lift the pressure of ink
Elasticity.Spiral conductive carbon fibres peacekeeping expanded graphite powder has good compression resilience, with conductive black, silica island chain knot
Structure forms obvious compression effect in high resiliency resin together, and this compression changes conductive network in protection carbon pulp layer
Compactness extent, and then the electric conductivity of this carbon slurry has the characteristic that is changed with the change of pressure value.Will be this
Carbon slurry makes the structure of the shapes such as grid between contact carbon pulp layer, on the one hand can improve the wear-resisting, flexible of contact carbon pulp layer
Performance, and cause sensing unit output current value produced with the change of contact carbon pulp layer pressing contact part it is different defeated
Go out signal, on the other hand become the interval carbon pulp layer of conductive characteristic of resistance with pressure changeable in the process of generation elastic deformation that is pressurized
In, can be with sequential change interval carbon pulp layer with contacting the exposure level between carbon pulp layer and contact carbon pulp layer so that pass
Feel the output resistance of unit（Or electric current）Value is with keeping continuity corresponding to be changed, that is, improve sensor by during different pressures with
The precision of its corresponding output valve.
Because silver slurry layer fragility is high, the easy fracture in bending.And people significantly increases when running to the impulse force of shoe-pad, punching
Great instantaneous deformation amount can then be produced by hitting moment, according to the existing thin film sensor with large area silver slurry layer, then pole
Frangibility, this obviously limits use of the thin film switch in the field.And being set between silver slurry layer and PET has compression rebound
Property protection carbon pulp layer, then can improve the toughness of notable silver slurry layer, so as to improve its service life, expand the scope of application.Specifically
For, contact carbon pulp layer is separately positioned on silver slurry layer both sides with protection carbon pulp layer, it can't be influenceed normally to use, protection carbon slurry
Layer is located between silver slurry layer and pet layer, it is to avoid silver slurry layer is directly contacted with pet layer.When pressure sensor receives foot impacts, protect
Shield carbon pulp layer absorbs momentum, is disperseed momentum due to the material property of its compression rebound, it is to avoid it directly acts on silver paste
Layer, is thus remarkably improved the service life of pressure sensor.
Pressure sensor needs to set independent power supply, and wearable smart machine frequency of use is high, then needs to use
Rechargable power supplies, still suffer from certain inconvenience when using.The present invention in footwear by setting magnetic induction loop and producing magnetic induction line
Permanent magnetism magnetic stripe, can during human body walking or running self-generating, and electricity is stored in power supply mould after rectification module
In block.On the one hand, because pressure sensor power consumption is relatively low；On the other hand, due to there is wireless charging device in footwear, then it can ensure
Unrestrictedly used in the case where need not periodically remove power source charges, so as to improve the convenience used.Can wherein one
Magnetic induction loop is set in footwear, permanent magnetism magnetic stripe is set in another footwear.Certainly, magnetic induction loop also can be simultaneously set in the footwear of left and right
And magnetic stripe, on the premise of usage comfort is not influenceed.
In addition, according to variable resistance scope it is wide the characteristics of.The behavior act of people can be also judged according to different pressures, is applied to
The vivid effect in VR fields, further lifting smart machine.
Brief description of the drawings
Fig. 1 is decomposition texture schematic diagram of the invention；
Fig. 2 is cross section structure diagram of the invention；
Fig. 3 is use state schematic diagram of the invention；
Fig. 4 is the operation principle schematic diagram of sensing unit of the present invention；
Fig. 5 is the operation principle schematic diagram of inventive sensor；
Fig. 6 is another schematic diagram for contacting carbon pulp layer structure of the present invention.
Description of reference numerals：1 pet layer, 2 protection carbon pulp layer, 3 silver slurry layer I, 4 contact carbon pulp layer, 5 interval carbon pulp layer, 6 pairs
Face adhesive tape layer, 7 silver slurry layer II, 8 through holes, 9 magnetic stripes, 10 magnetic induction loops, 11 rectification modules, 12 processor modules, 13 power modules,
14 sensing units, 15RF modules.
Embodiment
Below in conjunction with Fig. 1 ~ 6, present disclosure is described in detail by specific embodiment.The resistance with pressure change pressure
Force snesor includes a pair of the pet layers 1 bonded by two-sided tape, the silver slurry layer I 3 being separately positioned on each pet layer and silver paste
Two-sided tape between layer II 7, silver paste for covering layer contact carbon pulp layer 4, contact carbon pulp layer is provided with through hole 8 is formed
Hollow structure, contact carbon pulp layer 4 is provided with network provided with interval carbon pulp layer 5, interval carbon pulp layer.It is preferred that, grid is uniform
In the carbon pulp layer 5 of interval.Provided with protection carbon pulp layer 2 between silver slurry layer I 3 or silver slurry layer II 7 and pet layer 1.Be spaced carbon pulp layer with
Protection carbon pulp layer employs identical raw material and method is prepared from, and employs and existing thin film switch conductive carbon paste layer（Or
Contact carbon pulp layer）The different carbon slurry formulas with rebound characteristics, the carbon pulp layer side Standard resistance range being made of the formula：50k
Ω~1000kΩ/sq。
As shown in Fig. 2 contact carbon pulp layer is not due to using the component with obvious rebound characteristics, upper and lower contact carbon pulp layer 4
If not being spaced carbon pulp layer when contacting under pressure, generally in this case as technical background above is introduced, only
The basic single resistance value export technique effect of thin film switch product, i.e., the thin film switch when pressure reaches minimum can be reached
Resistance by disconnecting（Infinite）To connection（Produce certain resistance value）, resistance value will not change with the increase of pressure
Become or knots modification very little.Acted on because the interval carbon pulp layer with network provides resilient protection for contact carbon pulp layer,
On the one hand the abrasion resistance properties between upper and lower contact carbon pulp layer face are added, that is, prevent contact layer from directly contacting long-time stress
Gradually wearing out causes contact resistance unstable, influences the accuracy of detection of pressure sensitivity data；On the other hand, due to the net of interval carbon pulp layer
Lattice structure and its elastic characteristic so that sensor unit is pressurized after connection, with the increase of pressure, contact carbon pulp layer（Such as Fig. 4 institutes
Show）Through the contact area of grid（Module）Also corresponding increase, the resistance value of generation also respective change, i.e., with the increasing of pressure
Plus, resistance value is also corresponded to and changed, and produces the technique effect that pressure changeable becomes resistance output.And due to interval carbon pulp layer in itself
Nonisulated to have higher sheet resistance value, between insulation and general contact carbon slurry, it collectively forms conduction with contacting carbon pulp layer
Carbon pulp layer, adds the resistance output of different pressures scope so that this sensing list of the interval carbon pulp layer with network
The reaction of member is more sensitive.Further, since employing the protection carbon pulp layer and interval carbon pulp layer with rebound characteristics, pressure is improved
The overall flexibility of force snesor, further extends the service life of silver slurry layer and contact carbon pulp layer.
Protection carbon pulp layer with compression resilience is prepared from by following raw material according to percentage by weight：Coiled carbon fibers
3~5wt%；18 ~ 20wt% of conductive black；2 ~ 5wt% of expanded graphite；Silica 1 ~ 2wt%；10 ~ 25wt% of resin；Resin solvent 42
~64wt%；0.2 ~ 1wt% of auxiliary agent；
Resin is selected from thermoplastic polyurethane（TPU）, polyurethane（PU）Or natural emulsion（NR）One or more of.
Wherein, the coiled carbon fibers that spiral conductive carbon fibre is prepared using general catalyzing acetylene pyrolysismethod, are then carried out
2000 DEG C of graphitization processings so that coiled carbon fibers electrical conductivity is lifted, spiral carbon, which receives the consumption of fiber 3~5%, effectively to be carried
Rise the compression elasticity of ink.The Ω m of the preferred resistivity of conductive black≤2, such as Holland AKZO（Aksu Nobels）The section of company
Black Ketjenblack EC300J, 600JD type of qin, the Printex XE-2B of Degussa companies of Germany and Cabot companies of the U.S.
BP2000（Black Pearls 2000）Deng.The too low ink resistance of the mass percent of conductive black can be higher, and ratio is too high
Ink adhesion can be caused to decline, 18wt% ~ 20wt% ratios are relatively more suitable.3wt%~4wt% expanded graphite powder is commercially available
Highly expanded rate graphite be crushed to about 40 μm through high speed gas grinding machine after powder, compression elasticity and resistance for coordinating ink,
The change that can optimize ink using the proportioning is resistive.Silica is the aerosil of granularity≤10 μm.Resin can select
10wt% ~ 25wt% elastomeric thermoplastic polyurethane（TPU）, polyurethane（PU）Or natural emulsion（NR）One or more of,
After the proportioning of the other materials of the commensurate in scope, cross net and ink is optimal.Resin solvent be selected from dimethylformamide, cyclohexanone,
Butanone, dibasic ester, n-propyl acetate or water more than one.Auxiliary agent be selected from 0.2 ~ 0.3wt% of dispersant or levelling infusion 0.2 ~
0.3wt% more than one, the ratio range can ensure good froth breaking and levelability.Dispersant is selected from linear alkyl amide-type
Or branch type polycarboxylic acid, sodium laurate, polyvinyl alcohol, polyethylene glycol monolaurate more than one.Levelling defoamer is selected from
Siloxane-Oxyalkylene Copolymers.
It is preferred that, coiled carbon fibers, conductive black, the weight ratio of expanded graphite and resin are 1.2 ~ 5.0：4.0~10.0：
0.8~5.0：10.0.
Above-mentioned resistance can be prepared with the protection carbon pulp layer of the pressure sensor of pressure change using following methods：
Step 1）Resin is completely dissolved in solvent, under rotating speed >=2000rpm stirring conditions, silica is sequentially added,
Auxiliary agent, conductive helical carbon fiber, conductive black, expanded graphite；
Step 2）Conductive helical carbon fiber prepares coiled carbon fibers using general catalyzing acetylene pyrolysismethod, then 2000 DEG C of graphite
Change is handled；
Step 3）≤ 60 μm are ground to through three-roll grinder after component is well mixed, then is obtained with ball mill grinding to≤30 μm
To 30 ~ 50PaS of viscosity ink.
Above-mentioned pressure sensor is used for Intelligent worn device, such as footwear product can use following structure.The intelligent shoe bag
Some pressure sensors being disposed therein in a footwear are included, pressure sensor includes a pair of the PET bonded by two-sided tape
Double faced adhesive tape between layer, the silver slurry layer being separately positioned on each pet layer, the contact carbon pulp layer of silver paste for covering layer, contact carbon pulp layer
Band is provided with hollow structure, and contact carbon pulp layer is provided with interval carbon pulp layer, and interval carbon pulp layer is provided with network, silver slurry layer with
Provided with protection carbon pulp layer between pet layer.Silver slurry layer is provided with some magnetic induction loops 10, is connected respectively with each magnetic induction loop two ends
Rectification module 11, the power module 13 connected with rectification module, power module 13 is in parallel with each sensing unit 14, while power supply mould
Block is connected with RF modules 15 and processor module 12.The magnetic stripe 9 of some magnetic field line cutting magnetic induction coils is provided with another footwear.For
Service precision is improved, sensing unit is separately positioned on position corresponding with tiptoe, arch of the foot or/and heel.Tiptoe is preferably included
Five regions, i.e. first metatarsal bone region, second and os metatarsale tertium head region, first metatarsal bone root region,
Os metatarsale tertium root region and fifth metatarsal bone root region, the preferred cuboid region of arch of the foot, the preferred heel of heel
Bone region.
In use, being powered from power module to processor module, processor module is defeated to each sensing unit according to time point
Go out pulse current, because the contact area of the corresponding moment contact carbon pulp layer of each sensing unit is different, produced resistance is different, enters
And different size of current signal is generated, the current signal is sent after processor carries out pressure sensitivity data processing by RF modules
To smart machine receiving terminal, such as smart mobile phone.
For example, when walking, the not sensing unit of relevant position in the same time（By taking A ~ G as an example, in actual use, it is considered to open
Cost and production difficulty are sent out, can suitably increase and decrease or change position）Output current it is as shown in table 1：
Table 1
Note：T1 ~ t6 is first time pulse cycle, and wherein t1 moment right crus of diaphragm landing is as supporting part, and left foot is hanging；T2 moment left foots
Heel is contacted with ground, and other positions are not yet contacted with ground；T3 moment heel is contacted with ground simultaneously with cuboid, other positions
Not yet contacted with ground, but now heel stress is obviously reduced；T4 moment distal metatarsal head is contacted with ground simultaneously with cuboid, heel
Turn forward liftoff, tiptoe will be contacted with ground, cuboid stress is obviously reduced；T5 moment metatarsal front ends are with end while and ground
Contact, cuboid just leans forward liftoff, and distal metatarsal head stress is obviously reduced；T6 moment distal metatarsal heads lean forward it is liftoff, metatarsal front end by
Gradually lean forward liftoff, left foot completes circulation of once marking time.
Because the posture of walking of different wearers is different, therefore produced electric current Ia ~ Ig during t1 ~ t6 can also be present
Difference.Thus, unique correspondence encoded radio can be obtained respectively at t1 ~ t6 each moment respectively, and after each encoded radio is merged, you can
Obtain the specific identity identification coding similar to encrypted code（Code totally eight, corresponds to T, A ~ G respectively, that is, the
When unitary code T is continuous, A ~ G have unique corresponding coding, and ability program is proceeding after whole code matches）.This
Outside, even same wearer, it is also possible to produce difference when the speed of travel is different, rising for data acquisition now should then be set
Time beginning and end time, and the repeatedly measurement sample in the collection is interval, obtain Trendline or obtain each current signal can
Letter is interval, so as to avoid decoding data excessively single the problem of lead to not identification.
In addition, further to improve accuracy of identification, and inclined-plane knot as shown in Figure 6 will be set between two contact carbon pulp layer
Structure, the technical scheme of above-mentioned identification in actual applications, may have following possibility：The electric current output of each sensing unit
Only with to contact the contact area of carbon pulp layer relevant, therefore, even if diverse location on a sensor, as long as contact area is identical still
Exportable same electric current causes misidentification.To solve the problem, and the contact carbon pulp layer with ramp structure is used, due to inclined-plane
Setting, different current signals are inherently exported in the different contact position of contact carbon pulp layer, so as to avoid misidentification.For side
Just the laying of carbon pulp layer is spaced, one of contact carbon pulp layer is generally set to inclined-plane, another contact carbon pulp layer is set to plane.
It is unfavorable even if setting inclined-plane also will not produce other to the normal function of sensing unit substantially because contact carbon pulp layer thickness is smaller
Influence, but can effectively solve the above problems.Other structures or the parts, this area skill such as interval carbon pulp layer are not showed that in Fig. 6
Art personnel should can be with the beyond all doubt structure for being inferred to the sensor unit with ramp structure according to the design of the present invention.
And the spacing distance between contact carbon pulp layer is distributed in the asymmetric gradient shown in Fig. 6, between the deeper contact carbon pulp layer of color
Gap it is smaller, gap minimum value for interval carbon pulp layer thickness.
During access time point t1 ~ tn, it is proposed that using taking at equal intervals a little, on the one hand it is easy to design pulse output routine, it is another
Aspect can make data acquisition and recognizer more simple.Certainly, also can using time interval not wait take a method, further carry
The specificity of high identity coding.
Embodiment 1
TPU 25g is first completely dissolved in cyclohexanone and dimethylformamide in the case where 40 DEG C are stirred
1：In 1 75g solvents.Then under 3000rpm high-speed stirred in be gradually added 2g silica, 0.2g icosa alkene bases successively
Octadecyl amide, 3.5g conductive helicals carbon fiber, 20g conductive blacks, 4g expanded graphites.Run under this high shear agitation
2h, fineness is ground to less than 60 μm after finally component is well mixed through three-roll grinder, then low to fineness with ball mill grinding
In 30 μm.
In the present embodiment, each parameter of gained ink is under the material rate：Viscosity 45PaS, sheet resistance, which become, turns to 50k Ω
~1000kΩ/sq（It is screen printed onto in PET film, 18 μm ± 1.8 μm of thickness）, film hardness 80A.
Embodiment 2
First by waterborne polyurethane resin 25g stirring at normal temperature in the case of, be completely dissolved in 75g butanone.Then 2000rpm's
2.5g hydrophilic silicon oxides, 0.2g sodium laurates, 3g conductive helicals carbon fiber, 18g are gradually added under high-speed stirred successively
Conductive black, 4g expanded graphites.1h is run under this high shear agitation, through three-roll grinder after finally component is well mixed
It is ground to fineness and is less than 30 μm less than 60 μm, then with ball mill grinding to fineness.
In the present embodiment, each parameter of gained ink is under the material rate：Viscosity 34PaS, sheet resistance, which become, turns to 50k Ω
~ 1000k Ω/sq (are screen printed onto in PET film, 15 μm ± 1.5 μm of thickness), film hardness 75A.
Embodiment 3
It under natural emulsion 5g and aqueous polyurethane 20g stirring at normal temperature, will first be sufficiently mixed and be dissolved in 75g arbitrary proportions are mixed two
In the mixed solution of valency acid esters and n-propyl acetate.Then under 2000rpm high-speed stirred in be gradually added successively 1.5g parent
Aqueous silica, 0.2g polyethylene glycol monolaurates, 4g conductive helicals carbon fiber, 20g conductive blacks, 2g expanded graphites
Powder.1h is run under this high shear agitation, fineness≤60 μm are ground to through three-roll grinder after finally component is well mixed,
Again with ball mill grinding to fineness≤30 μm.
In the present embodiment, each parameter of gained ink is under the material rate：Viscosity 36PaS, sheet resistance, which become, turns to 50k Ω
~ 1000k Ω/sq (are screen printed onto in PET film, 12 μm ± 1.2 μm of thickness), film hardness 70A.
Claims (7)
1. a kind of resistance is with the pressure sensor of pressure change, including bonded by two-sided tape a pair of pet layers, set respectively
Two-sided tape between silver slurry layer, the contact carbon pulp layer of silver paste for covering layer on each pet layer, contact carbon pulp layer is provided with hollow knot
Structure, contact carbon pulp layer is provided with interval carbon pulp layer, it is characterised in that：The interval carbon pulp layer is provided with grid.
2. resistance according to claim 1 is with the pressure sensor of pressure change, it is characterised in that：The grid is distributed on
It is spaced in carbon pulp layer.
3. resistance according to claim 1 or 2 is with the pressure sensor of pressure change, it is characterised in that：The contact carbon
Ramp structure is provided between pulp layer.
4. resistance according to claim 3 is with the pressure sensor of pressure change, it is characterised in that：Silver paste layer with
Provided with protection carbon pulp layer between pet layer.
5. resistance according to claim 4 is with the pressure sensor of pressure change, it is characterised in that the protection carbon pulp layer
It is prepared from by following raw material according to percentage by weight：3 ~ 5wt% of coiled carbon fibers；18 ~ 20wt% of conductive black；Expanded graphite 2 ~
5wt%；Silica 1 ~ 2wt%；10 ~ 25wt% of resin；42 ~ 64wt% of resin solvent；0.2 ~ 1wt% of auxiliary agent；
Resin is selected from thermoplastic polyurethane（TPU）, polyurethane（PU）Or natural emulsion（NR）One or more of；
Resin solvent is selected from more than one of dimethylformamide, cyclohexanone, butanone, dibasic ester or n-propyl acetate；
Auxiliary agent is selected from more than one of 0.2 ~ 0.3wt% of 0.2 ~ 0.3wt% of dispersant or levelling infusion；Dispersant is selected from linear alkyl
Amide-type or branch type polycarboxylic acid, sodium laurate, polyvinyl alcohol, polyethylene glycol monolaurate more than one；Levelling froth breaking
Agent is selected from Siloxane-Oxyalkylene Copolymers.
6. resistance according to claim 5 is with the pressure sensor of pressure change, it is characterised in that：The spiral carbon is fine
Dimension, conductive black, the weight ratio of expanded graphite and resin are 1.2 ~ 5.0：4.0~10.0：0.8~5.0：10.0.
7. a kind of resistance is with the interval carbon pulp layer of the pressure sensor of pressure change or the preparation method of protection carbon pulp layer, its feature
It is, comprises the following steps：
Step 1）Resin is completely dissolved in solvent, under rotating speed >=2000rpm stirring conditions, silica is sequentially added,
Auxiliary agent, conductive helical carbon fiber, conductive black, expanded graphite；
Step 2）Conductive helical carbon fiber prepares coiled carbon fibers using general catalyzing acetylene pyrolysismethod, then 2000 DEG C of graphite
Change is handled；
Step 3）≤ 60 μm are ground to through three-roll grinder after component is well mixed, then is obtained with ball mill grinding to≤30 μm
To 30 ~ 50PaS of viscosity ink.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710460819.XA CN107167268A (en) | 2017-06-18 | 2017-06-18 | Resistance with pressure change pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710460819.XA CN107167268A (en) | 2017-06-18 | 2017-06-18 | Resistance with pressure change pressure sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112294572A (en) * | 2019-07-26 | 2021-02-02 | 美宸科技股份有限公司 | Air cushion device and air cushion system for medical care |
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