CN106646985A - Waveband tunable infrared reflector and production method thereof - Google Patents
Waveband tunable infrared reflector and production method thereof Download PDFInfo
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- CN106646985A CN106646985A CN201611008519.XA CN201611008519A CN106646985A CN 106646985 A CN106646985 A CN 106646985A CN 201611008519 A CN201611008519 A CN 201611008519A CN 106646985 A CN106646985 A CN 106646985A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
- G02F1/13345—Network or three-dimensional gels
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Dispersion Chemistry (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a waveband tunable infrared reflector and a production method thereof. The method mixes a chiral dopant, photopolymerizable liquid crystal monomers, a photoinitiator and negative liquid crystal and obtains a liquid crystal mixture. Two transparent substrates are filled with the liquid crystal mixture, and voltage can be introduced into the two transparent substrates. The photoinitiator initiates polymerization of the photopolymerizable liquid crystal monomers into a polymer network under the effect of ultraviolet light. The chiral dopant drives the negative liquid crystal to form cholesteric liquid crystal of a helical structure. The cholesteric liquid crystal has a unique pitch, and a specific pitch structure reflects a waveband of infrared light of a specific wavelength. The polymer network can capture impurity cations. When the transparent substrates are electrified, the impurity cations move towards the transparent substrates electrically connected with a power supply negative electrode. The polymer network drives the cholesteric liquid crystal to move, so that the pitch of the cholesteric liquid crystal changes and the infrared reflection bandwidth becomes wider.
Description
Technical field
The present invention relates to infrared external reflection device, and in particular to a kind of band tunable infrared external reflection device and its preparation side
Method.
Background technology
Modern architecture gives people class and creates office, study, the indoor environment of life, the comfort level of indoor environment and people
Life health is closely bound up.The widely used refrigeration of building, automobile or heating combined equipment are same with this keeping the comfort level of environment
When, the discharge of pernicious gas cannot be estimated for the injury that the mankind and environment bring.With the change of weather, the need of people
Ask and be constantly occurring change, and traditional mechanical heat-insulated, refrigeration modes, for example：Shutter, air-conditioning equipment can not reach with
The intelligent control of the change of people's demand and weather.
The content of the invention
The technical problem to be solved is to provide a kind of band tunable infrared external reflection device and its preparation side
Method.
The technical solution used in the present invention is：
A kind of band tunable infrared external reflection device, including the first transparent substrates and the second transparent substrates that are oppositely arranged
And power supply module, the positive pole of first transparent substrates and the power supply module is electrically connected with, second transparent substrates with
The negative pole of the power supply module is electrically connected with, and encapsulation between first transparent substrates and second transparent substrates is formed and adjusted
Liquid crystal compound is filled with area, the regulatory region, the liquid crystal compound includes that negative liquid crystal, chiral dopant, light draw
Agent and polymer network are sent out, the polymer network is by the light trigger initiation photo-polymerizable liquid crystal monomer polymerization
Into network shaped polymer, the negative liquid crystal is scattered in the polymer network, in first transparent substrates and described
In the state of second transparent substrates are not powered on, the negative liquid crystal is the cholesteric liquid crystal with single pitch, the polymer
Network can capture the impurity cationic in the liquid crystal compound, logical in first transparent substrates and second transparent substrates
In the state of electricity, the cation is moved under electric field action to second transparent substrates, drive the polymer network to
The second transparent substrates movement so that the pitch of the cholesteric liquid crystal changes.
In some specific embodiments, in the state that first transparent substrates and second transparent substrates are powered
Under, the cation is moved under electric field action to second transparent substrates, drives the polymer network to described second
Transparent substrates are moved, and become big near the pitch of the cholesteric liquid crystal of first transparent substrates, near second transparent substrates
The pitch of cholesteric liquid crystal diminish.
In some specific embodiments, two pieces of relative surfaces of the transparent substrates are provided with parallel both alignment layers.
In some specific embodiments, the photopolymerizable monomer is RM82 or RM257.
In some specific embodiments, the negative liquid crystal is LC-2079 or BL109.
In some specific embodiments, the chiral dopant is S811 or S1011.
In some specific embodiments, the light trigger is Irgacure-369 or Irgacure-651.
Present invention also offers a kind of preparation method of band tunable infrared external reflection device, comprises the following steps：
S1：Prepare the first transparent substrates and the second transparent substrates, first transparent substrates and second transparent substrates
It is oppositely arranged；
S2：The spin coating both alignment layers on the relative surface of first transparent substrates and second transparent substrates, and rub
Orientation；
S3：First transparent substrates and second transparent substrates are prepared into liquid crystal cell；
S4：Negative liquid crystal, chiral dopant, photo-polymerizable liquid crystal monomer, light trigger mixing are weighed, heating turns liquid crystal
It is changed into isotropic liquid, obtains liquid crystal compound；
S5：The liquid crystal compound is injected into the liquid crystal cell, the chiral monomer and the chiral dopant cause institute
State negative liquid crystal and form cholesteric helix structure；
S6：The positive pole of first transparent substrates and the power supply module is electrically connected with, second transparent substrates and institute
The negative pole for stating power supply module is electrically connected with.
In some specific embodiments, with liquid crystal cell described in ultraviolet light, the light trigger initiation is described can
Photopolymerizable liquid crystals monomer is polymerized to form polymer network.
In some specific embodiments, the both alignment layers are parallel both alignment layers.
It is negative liquid crystal described in the liquid crystal compound, chiral dopant, phtotpolymerizable in some specific embodiments
Close liquid crystal monomer, the mass ratio of light trigger is (80-90)：(3-13)：(5-15)：(0.1-0.8).
The invention has the beneficial effects as follows：
The present invention mixes chiral dopant, photo-polymerizable liquid crystal monomer, light trigger with negative liquid crystal, has obtained liquid crystal
Mixture, liquid crystal compound is filled into the transparent substrates of two pieces of accessible voltage, and light trigger is under the action of uv light
The photo-polymerizable liquid crystal monomer is caused to aggregate into polymer network, the chiral dopant causes the negative liquid crystal to form spiral shell
The cholesteric liquid crystal of rotation structure, cholesteric liquid crystal has single pitch, specific pitch structural response specific wavelength it is infrared
The wave band of light.Ester group on polymer network can catch the impurity cationic in liquid crystal mixed material, described first
In the state of transparent substrates and second transparent substrates are powered, the polymer network adsorbs in the mixed liquid crystal material
Impurity cationic is moved under electric field action to second transparent substrates electrically connected with power cathode, near power cathode
Polymer network drives the pitch of cholesteric liquid crystal to diminish, and the polymer network near positive source drives the spiral shell of cholesteric liquid crystal
It is big away from becoming, so as to produce certain pitch gradient, so that infrared external reflection bandwidth is broadened by narrow.Led by adjusting two pieces of printing opacities
Voltage swing between electric substrate, can regulate and control pitch gradient size, so as to adjust the size of infrared external reflection bandwidth.
Description of the drawings
Fig. 1 is the sectional view schematic diagram of band tunable infrared external reflection device.
Fig. 2 is band tunable infrared external reflection device schematic partial cross-sectional view under unpowered state.
Fig. 3 is band tunable infrared external reflection device schematic partial cross-sectional view in the energized state.
Fig. 4 is Infrared Reflective Spectra figure of the band tunable infrared external reflection device under different voltages.
Specific embodiment
Embodiment 1：
With reference to Fig. 1, Fig. 1 is the sectional view schematic diagram of band tunable infrared external reflection device, the invention provides a kind of
Including the first transparent substrates 1 and the second transparent substrates 2 and power supply module 3 that are oppositely arranged, it is characterised in that described first is saturating
The positive pole of photopolymer substrate 1 and the power supply module 3 is electrically connected with, the negative electricity of second transparent substrates 2 and the power supply module 3
Property connection, between first transparent substrates 1 and second transparent substrates 2 by packaging adhesive frame 6 encapsulation form regulatory region 4,
It is filled with liquid crystal compound, the regulatory region 4 in the regulatory region 4 and is additionally provided with for supporting the infrared external reflection device thickness
Introns 5, the height of the introns 5 is equal to the thickness of the regulatory region 4.First transparent substrates 1 and described second
Transparent substrates 2 are equipped with parallel both alignment layers 7 on relative surface.
With reference to Fig. 2, Fig. 2 is band tunable infrared external reflection device schematic partial cross-sectional view under unpowered state, institute
Stating liquid crystal compound includes negative liquid crystal, chiral dopant, light trigger and polymer network 9, state polymer network 9 be by
The light trigger causes the network shaped polymer that the photo-polymerizable liquid crystal monomer is polymerized, in first transparent substrates
1 and in the state of second transparent substrates 2 are not powered on, the negative liquid crystal is the cholesteric liquid crystal of helically structure 10, institute
State cholesteric liquid crystal and there is single pitch, it is described poly- containing impurity cationic 11 and impurity anions 8 in the liquid crystal compound
Polymeric network 9 can capture the impurity cationic 11 in the liquid crystal compound.
With reference to Fig. 3, Fig. 3 is band tunable infrared external reflection device schematic partial cross-sectional view in the energized state, in institute
State in the state of the first transparent substrates 1 and second transparent substrates 2 are powered, the cation 11 is under electric field action to described
Second transparent substrates 2 are moved, and drive the polymer network 9 to move to second transparent substrates 2 so that the cholesteric phase liquid
Brilliant pitch changes, and becomes big near the pitch of the cholesteric liquid crystal of first transparent substrates 1, near second printing opacity
The pitch of the cholesteric liquid crystal of substrate 2 diminishes.According to below equation：λ=P × n, wherein, P represents the finger of chiral nematic phase liquid crystal
Rotate the spacing of 2 π in helical axis directions to arrow, i.e., one pitch, λ is the cholesteric liquid crystal reflection wavelength of single pitch, and n is
The average optical index of liquid crystal；Δ λ=(ne-no) × P=Δ n × P, wherein, Δ λ is reflection spectrum bandwidth, and Δ n is birefringence
Rate；When P values become a scope by single value, the wavelength and the frequency range of reflection that liquid crystal compound is reflected also can become therewith
It is wide.
Above-mentioned band tunable infrared external reflection device is prepared by following steps：Prepare the first transparent substrates and
Two transparent substrates, first transparent substrates and second transparent substrates are oppositely arranged；In first transparent substrates and institute
State the parallel both alignment layers of spin coating on the relative surface of the second transparent substrates, and friction orientation；By first transparent substrates and described
Second transparent substrates are prepared into liquid crystal cell；Prepare liquid crystal compound, weigh 81.4 mass parts negative liquid crystal LC-2079,12.6
The chiral dopant S811 of mass parts, the photo-polymerizable liquid crystal monomer RM82 of 5 mass parts, the light trigger of 1 mass parts
Irgacure-651 mixes, the negative liquid crystal LC-2079, its dielectric constant Δ ε=- 6.7, birefringence Δ n=0.15,
The structural formula of chiral dopant S811 is
The structural formula of the liquid crystal monomer RM82 is
The structural formula of the light trigger Irgacure-651 isThen thermal station with 50r/s, 60 DEG C
Stirring 5min, treats that it is well mixed, and obtains liquid crystal mixed material；Under the conditions of gold-tinted, mixed liquid crystal material is heated into 60 DEG C,
Liquid crystal mixed material is set to be changed into cholesteric liquid crystal mixture；The liquid crystal compound is injected into the liquid crystal cell, the chirality
Monomer and the chiral dopant cause the negative liquid crystal to form cholesteric helix structure；First transparent substrates with it is described
The positive pole of power supply module is electrically connected with, and second transparent substrates are electrically connected with the negative pole of the power supply module；Use ultraviolet light
The liquid crystal cell is irradiated, the light trigger causes the photo-polymerizable liquid crystal monomer to be polymerized to form polymer network.
Embodiment 2：
The present embodiment is substantially the same manner as Example 1, and difference is：The photopolymerizable monomer be RM257, its structure
Formula isThe negative liquid crystal
For BL109, its dielectric constant Δ ε=- 6～-14, birefringence Δ n=0.1～0.15, the chiral dopant is
S1011, its structural formula isThe light trigger
For Irgacure-369, its structural formula is
Claims (10)
1. a kind of band tunable infrared external reflection device, including the first transparent substrates and the second transparent substrates being oppositely arranged with
And power supply module, it is characterised in that first transparent substrates are electrically connected with the positive pole of the power supply module, and described second is saturating
Photopolymer substrate is electrically connected with the negative pole of the power supply module, encapsulates between first transparent substrates and second transparent substrates
Formed and be filled with regulatory region, the regulatory region liquid crystal compound, the liquid crystal compound includes negative liquid crystal, chiral doping
Agent, light trigger and polymer network, the polymer network is to cause the photo-polymerizable liquid crystal list by the light trigger
The network shaped polymer that body is polymerized, the negative liquid crystal is scattered in the polymer network, in the first printing opacity base
In the state of plate and second transparent substrates are not powered on, the negative liquid crystal is the cholesteric liquid crystal with single pitch, institute
The impurity cationic that polymer network can be captured in the liquid crystal compound is stated, in first transparent substrates and described second saturating
In the state of photopolymer substrate is powered, the cation is moved under electric field action to second transparent substrates, drives the polymerization
Thing network to second transparent substrates are moved so that the pitch of the cholesteric liquid crystal changes.
2. band tunable infrared external reflection device according to claim 1, it is characterised in that in the first printing opacity base
In the state of plate and second transparent substrates are powered, the cation is moved under electric field action to second transparent substrates
It is dynamic, drive the polymer network to move to second transparent substrates, near the cholesteric liquid crystal of first transparent substrates
Pitch become big, the pitch near the cholesteric liquid crystal of second transparent substrates diminishes.
3. band tunable infrared external reflection device according to claim 1, it is characterised in that two pieces of transparent substrates
Relative surface is provided with parallel both alignment layers.
4. band tunable infrared external reflection device according to claim 1, it is characterised in that the photopolymerizable monomer
For RM82 or RM257.
5. band tunable infrared external reflection device according to claim 1, it is characterised in that the negative liquid crystal is
LC-2079 or BL109.
6. band tunable infrared external reflection device according to claim 1, it is characterised in that the chiral dopant is
S811 or S1011.
7. band tunable infrared external reflection device according to claim 1, it is characterised in that the light trigger is
Irgacure-369 or Irgacure-651.
8. a kind of preparation method of band tunable infrared external reflection device, it is characterised in that comprise the following steps：
S1：The first transparent substrates and the second transparent substrates are prepared, first transparent substrates and second transparent substrates are relative
Arrange；
S2：The spin coating both alignment layers on the relative surface of first transparent substrates and second transparent substrates, and friction orientation；
S3：First transparent substrates and second transparent substrates are prepared into liquid crystal cell；
S4：Negative liquid crystal, chiral dopant, photo-polymerizable liquid crystal monomer, light trigger mixing are weighed, heating makes the liquid crystalline transition be
Isotropic liquid, obtains liquid crystal compound；
S5：The liquid crystal compound is injected into the liquid crystal cell, the chiral monomer and the chiral dopant cause described negative
Property Formation of liquid crystals cholesteric helix structure；
S6：The positive pole of first transparent substrates and the power supply module is electrically connected with, second transparent substrates and the electricity
The negative pole of source component is electrically connected with.
9. preparation method according to claim 8, it is characterised in that with liquid crystal cell described in ultraviolet light, the light draws
Sending out agent causes the photo-polymerizable liquid crystal monomer to be polymerized to form polymer network.
10. preparation method according to claim 8, it is characterised in that the both alignment layers are parallel both alignment layers.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611008519.XA CN106646985B (en) | 2016-11-16 | 2016-11-16 | Infrared reflecting device with tunable wave band and preparation method thereof |
| PCT/CN2017/109809 WO2018090858A1 (en) | 2016-11-16 | 2017-11-08 | Infrared reflection device with tunable wave band, and manufacturing method therefor |
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| CN201611008519.XA CN106646985B (en) | 2016-11-16 | 2016-11-16 | Infrared reflecting device with tunable wave band and preparation method thereof |
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| CN106997133A (en) * | 2017-05-17 | 2017-08-01 | 华南师范大学 | A kind of preparation method of infrared external reflection device |
| CN107272277A (en) * | 2017-06-15 | 2017-10-20 | 华南师范大学 | A kind of adjustable infrared external reflection device of reflection ratio |
| CN107346084A (en) * | 2017-07-21 | 2017-11-14 | 华南师范大学 | A kind of ATR-FTIR reflection device and preparation method thereof |
| WO2018090858A1 (en) * | 2016-11-16 | 2018-05-24 | 深圳市国华光电科技有限公司 | Infrared reflection device with tunable wave band, and manufacturing method therefor |
| CN108319059A (en) * | 2018-01-25 | 2018-07-24 | 华南师范大学 | A kind of infrared external reflection device of electroresponse |
| CN108363237A (en) * | 2018-03-15 | 2018-08-03 | 京东方科技集团股份有限公司 | Reflectance coating and preparation method thereof, reflection subassembly and display device |
| CN108398825A (en) * | 2018-03-06 | 2018-08-14 | 合肥工业大学 | A kind of the liquid crystal light modulation device and its preparation process of tunable IR |
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| CN107346084B (en) * | 2017-07-21 | 2020-10-16 | 华南师范大学 | Total reflection infrared reflection device and preparation method thereof |
| CN108319059A (en) * | 2018-01-25 | 2018-07-24 | 华南师范大学 | A kind of infrared external reflection device of electroresponse |
| WO2019144648A1 (en) * | 2018-01-25 | 2019-08-01 | 华南师范大学 | Electrically-responsive infrared reflective device |
| CN108319059B (en) * | 2018-01-25 | 2020-01-07 | 华南师范大学 | Electric response infrared reflection device |
| CN108398825A (en) * | 2018-03-06 | 2018-08-14 | 合肥工业大学 | A kind of the liquid crystal light modulation device and its preparation process of tunable IR |
| CN108363237A (en) * | 2018-03-15 | 2018-08-03 | 京东方科技集团股份有限公司 | Reflectance coating and preparation method thereof, reflection subassembly and display device |
| CN109001930A (en) * | 2018-07-13 | 2018-12-14 | 华南师范大学 | A kind of electroresponse infrared external reflection device and preparation method thereof |
| CN109001930B (en) * | 2018-07-13 | 2021-11-02 | 华南师范大学 | Electric response infrared reflection device and preparation method thereof |
| CN109143623A (en) * | 2018-08-27 | 2019-01-04 | 华南师范大学 | A kind of infrared external reflection device and preparation method thereof |
| CN109143623B (en) * | 2018-08-27 | 2021-08-10 | 华南师范大学 | Infrared reflection device and preparation method thereof |
| CN110373016A (en) * | 2019-06-25 | 2019-10-25 | 东南大学 | A kind of liquid crystal polyacrylate-liquid crystal polyurethane interpenetrating networks liquid crystal elastic body |
| WO2022142103A1 (en) * | 2020-12-31 | 2022-07-07 | 华南师范大学 | Polymer-stabilized liquid crystal laser, preparation method therefor, and device |
| CN113311625A (en) * | 2021-03-16 | 2021-08-27 | 合肥工业大学 | Polymer stabilized cholesteric liquid crystal color-changing glass and preparation method and application thereof |
| CN113655653A (en) * | 2021-07-29 | 2021-11-16 | 华南师范大学 | Liquid crystal dimming device and preparation method and application thereof |
| CN113641015A (en) * | 2021-07-30 | 2021-11-12 | 华南师范大学 | Infrared reflector and preparation method and application thereof |
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| Publication number | Publication date |
|---|---|
| WO2018090858A1 (en) | 2018-05-24 |
| CN106646985B (en) | 2021-06-22 |
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