CN102053417A - Polymer dispersed liquid crystal three steady-state membrane and preparation method thereof - Google Patents
Polymer dispersed liquid crystal three steady-state membrane and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a polymer dispersed liquid crystal three steady-state membrane and a preparation method thereof. The polymer dispersed liquid crystal three steady-state membrane comprises two layers of flexible transparent conductive thin membranes and a polymer dispersed liquid crystal layer arranged between the flexible transparent conductive thin membranes. Transparent conductive thin membrane layer electrodes are arranged on the inner surfaces of the flexible transparent conductive thin membranes. The polymer dispersed liquid crystal layer is mainly prepared by mixing a prepolymer, a chiral double-frequency liquid crystal material and a gasket material uniformly and adequately; and therefore, the polymer dispersed liquid crystal membrane made of the polymer dispersed liquid crystal layer has the advantages of three steady states of scattering Off state, semi-transparent On state and visible light scattering and infrared Bragg reflection Off state.
Description
Technical field
The present invention relates to a kind of polymer dispersed liquid crystal film, especially relate to a kind of Polymer Dispersed Liquid Crystal three-stable state film and preparation method thereof.
Background technology
Polymer Dispersed Liquid Crystal (Polymer Dispersed Liquid Crystal, PDLC) be that polymkeric substance and nematic phase (nematic) liquid crystal and wadding are mixed with certain ratio, be clipped between two flexible transparent conductive films, through being separated, nematic liquid crystal is separated out the formation liquid crystal droplet from polymkeric substance, polymer cure is wrapped in liquid crystal droplet wherein, a kind of composite membrane of formation.Composite membrane is during added electric field, because the refractive index of polymkeric substance do not match with the refractive index of nematic liquid crystal, so can cause light scattering, composite membrane is to OFF state only; Composite membrane is after applying electric field, and the refractive index of polymkeric substance and the refractive index of nematic liquid crystal are complementary, and cause transmittance, and composite membrane is to ON state only; Scattering OFF state that this composite membrane has and transmission ON state, these two stable states all null field are stable, and this composite membrane also has trans mode of operation, and be not transparent during added electric field, scattering on the contrary during added electric field.Pdlc film is the high-tech product of the invention eighties in 20th century, obtain increasing the application in top-grade building finishing field as dimming glass, and having using value in many fields such as large screen display, holographic grating, Electronic Paper, also still is the heat subject that the liquid crystal device researcher pays close attention to now.Cholesteric liquid crystal bistable state (Bistable State of Cholesteric Liquid Crystal) is that the plane attitude of cholesteric liquid crystal has visible light Prague selection bright attitude of reflection and burnt awl attitude is the dark attitude of scattering, these two attitudes can be stablized by null field, are a kind of technology that is applied on the Electronic Paper.In research to pdlc film, people have also obtained polymer dispersed cholesteric liquid crystal (PolymerDispersed Cholesteric Liquid Crystal, PDCLC) bi-stable membrane, it has Bragg reflection OFF state and transmission ON state, Prague selects reflection wavelength to be adjusted in visible light wave range, therefore not being at infrared band, is to absorb and transmission to infrared light, can not play convertible Energy Saving Windows function.Cholesteric liquid crystal can be formed by cholesteric ester and halogenide
Liquid crystal, also can be the liquid crystal that forms mutually by chiral nematic.Chiral molecules is if be divided into two halves, it half and second half can be not overlapping, just these two halves can not be mutually mirror, just say that it has chirality, molecule with this character just is chiral molecules, the liquid crystal that contains chiral molecules just makes chiral liquid crystal, chiral liquid crystal (cholesteric liquid crystal) have optical characteristics such as optical activity, Prague selection reflection.Dual-frequency liquid crystal (Dual-frequency liquidcrystal) is a dielectric conversion liquid crystal, is rendered as positivity liquid crystal (Δ ε=ε under low-frequency voltage drives
||-ε
⊥＞0), applies behind the electric field liquid crystal molecule and be parallel to direction of an electric field and arrange, and under HF voltage drives, be rendered as negative liquid crystal (Δ ε=ε
||-ε
⊥＜0), apply electric field after liquid crystal molecule arrange perpendicular to direction of an electric field.The chirality dual-frequency liquid crystal is a polymkeric substance chirality dual-frequency liquid crystal, and it is to add the cholesteric liquid crystal with dielectric conversion character that the chirality agent makes in dual-frequency liquid crystal.
Summary of the invention
Technical matters to be solved by this invention provides a kind ofly to be had scattering OFF state, translucent ON state and visible light scattering and adds Polymer Dispersed Liquid Crystal three-stable state film of three kinds of stable states of infrared light Bragg reflection OFF state and preparation method thereof.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of Polymer Dispersed Liquid Crystal three-stable state film, it is characterized in that comprising the two sheets of flexible transparent conductive film and be arranged at polymer dispersed liquid crystal layer between the described flexible transparent conductive film, the inner surface of described flexible transparent conductive film is provided with the electrically conducting transparent thin layer electrode, and described polymer dispersed liquid crystal layer mainly is to be stirred by prepolymer, chirality dual-frequency liquid crystal material and gasket material to be mixed and made into.
The thickness of described polymer dispersed liquid crystal layer is 30 μ m, and the weight ratio of described prepolymer and described chirality dual-frequency liquid crystal material is 1: (1～3), the content of described gasket material in described polymer dispersed liquid crystal layer is 1～10/mm
2
Described prepolymer mainly is made up of polymerisable monomer, chain-transferring agent and light trigger, and the percentage by weight of each component is: polymerisable monomer propoxyl group nonyl phenyl acrylate is 15～25%, the polymerisable monomer trimethylolpropane triacrylate is 65～75%, the chain-transferring agent decanedioic acid is 3～5%, light trigger 1173 is 3～5%.
The percentage by weight of described polymerisable monomer, described chain-transferring agent and described light trigger is: polymerisable monomer propoxyl group nonyl phenyl acrylate is 20%, the polymerisable monomer trimethylolpropane triacrylate is 70%, the chain-transferring agent decanedioic acid is 5%, light trigger 1173 is 5%.
Described chirality dual-frequency liquid crystal material mainly is formulated by S811 liquid crystal chiral adjuvant and dual-frequency liquid crystal, and the mass ratio of described S811 liquid crystal chiral adjuvant and described dual-frequency liquid crystal is 1: 9; Described dual-frequency liquid crystal is for being that 20% MBBA liquid crystal and mass percent are the potpourri that 80% DT91 liquid crystal is mixed with by mass percent.
The pitch of described chirality dual-frequency liquid crystal material is 0.5～2 μ m, and the Bragg reflection optical wavelength of described chirality dual-frequency liquid crystal material is 0.75～3 μ m.
Described gasket material is that diameter is the plastic microsphere of 30 μ m.
The refractive index of the refractive index of the refractive index of polymkeric substance, liquid crystal ordinary light, the non-ordinary light of liquid crystal is respectively 1.5～1.55,1.5～1.55,1.7～1.75 in the described polymer dispersed liquid crystal layer.
A kind of preparation method of Polymer Dispersed Liquid Crystal three-stable state film is characterized in that may further comprise the steps:
1. by weight 1: (1～3) takes by weighing prepolymer and chirality dual-frequency liquid crystal material, and with 1～10/mm
2Content add gasket material, at normal temperatures prepolymer, chirality dual-frequency liquid crystal material and gasket material are stirred mixing;
Described prepolymer mainly is made up of polymerisable monomer, chain-transferring agent and light trigger, and the percentage by weight of each component is: polymerisable monomer propoxyl group nonyl phenyl acrylate is 15～25%, the polymerisable monomer trimethylolpropane triacrylate is 65～75%, the chain-transferring agent decanedioic acid is 3～5%, light trigger 1173 is 3～5%;
Described chirality dual-frequency liquid crystal material mainly is formulated by S811 liquid crystal chiral adjuvant and dual-frequency liquid crystal, and the mass ratio of described S811 liquid crystal chiral adjuvant and described dual-frequency liquid crystal is 1: 9; Described dual-frequency liquid crystal is for being that 20% MBBA liquid crystal and mass percent are the potpourri that 80% DT91 liquid crystal is mixed with by mass percent;
2. on the inner surface of two sheets of flexible transparent conductive film, etch the electrically conducting transparent thin layer electrode respectively;
The potpourri transfer printing that 3. will evenly mix brushes between the two sheets of flexible transparent conductive film;
4. the two sheets of flexible transparent conductive film that utilizes the pressing machine will be printed with potpourri is squeezed into composite membrane;
5. composite membrane is separated, liquid crystal is fully separated out from polymkeric substance, forming mean diameter is the liquid crystal droplet of 3～5 μ m, solidifies liquid crystal droplet simultaneously.
Described Polymer Dispersed Liquid Crystal three-stable state film has scattering OFF state, translucent ON state and visible light scattering and adds three kinds of stable states of infrared light Bragg reflection OFF state, when between the electrically conducting transparent thin layer electrode, applying low frequency or DC electric field, after removing low frequency or DC electric field fast then, Polymer Dispersed Liquid Crystal three-stable state film presents the scattering OFF state; When between the electrically conducting transparent thin layer electrode, applying low frequency or DC electric field, fall after voltage system removes low frequency or DC electric field with ladder then, Polymer Dispersed Liquid Crystal three-stable state film presents translucent ON state; When between the electrically conducting transparent thin layer electrode, applying high-frequency electric field, fall after voltage system removes low frequency or DC electric field with ladder then, Polymer Dispersed Liquid Crystal three-stable state film presents the visible light scattering and adds infrared light Bragg reflection OFF state.
Compared with prior art, the invention has the advantages that and utilize prepolymer, chirality dual-frequency liquid crystal material and gasket material, be mixed and made into polymer dispersed liquid crystal layer by stirring, the polymer dispersed liquid crystal film that uses this polymer dispersed liquid crystal layer to make has scattering OFF state, translucent ON state and visible light scattering and adds three kinds of stable states of infrared light Bragg reflection OFF state.
Polymer Dispersed Liquid Crystal three-stable state film of the present invention is in the cholesteric liquid crystal box, for the transmittance T of green wavelength
Little farmland＜40%, T
Big farmland＞75%, T in the PDCLC box of big liquid crystal droplet
Little farmland＜10%, T
Big farmland～50%, and the little farmland of burnt awl attitude is two different stable states with big farmland, adds that the plane attitude also is a stable state, so constituted three-stable state.
Polymer Dispersed Liquid Crystal three-stable state film of the present invention has three kinds of stable states, that is: the little farmland scattering of burnt awl attitude OFF state, Jiao bore the translucent ON state in the big farmland of attitude, the visible light scattering of the big farmland of plane attitude and infrared light reflection OFF state, when applying the present invention to the Energy Saving Windows field, be driven into the big farmland of burnt awl attitude and realize translucent ON state; Be driven into the little farmland of burnt awl attitude in winter and realize the scattering OFF state, again infrared transmission can be arranged; Be driven into attitude big farmland in plane in summer and realize visible light scattering OFF state, again infrared light reflection can be arranged, although the wavelength coverage of solar radiation is very wide, but most concentration of energy are at the wave band of 0.22～4 μ m, account for 99% of gross energy, visible light accounts for 43%, infrared light accounts for 48.3%, and ultraviolet light accounts for 8.7%, and infrared light has significant thermal effect, launch the part infrared light summer on Energy Saving Windows, just reduced infrared transmission, reached purpose, allowed winter in the infrared light inlet chamber again to room temperature lowering, just increased infrared transmission, reached purpose again to indoor intensification.
Description of drawings
Fig. 1 is the structural representation of Polymer Dispersed Liquid Crystal three-stable state film of the present invention;
Fig. 2 a turns to direction of an electric field initial arrangement view for liquid crystal molecule after applying about 25 volts low-frequency current field between the electrode;
Fig. 2 b is the scattering OFF state synoptic diagram that Polymer Dispersed Liquid Crystal three-stable state film of the present invention presents;
Fig. 2 c is the translucent ON state synoptic diagram that Polymer Dispersed Liquid Crystal three-stable state film of the present invention presents;
Fig. 2 d shows up for liquid crystal after applying high-frequency electric field between the electrode is driven and causes nematic phase along face arrangement attitude synoptic diagram;
Fig. 2 e is that the scattering that Polymer Dispersed Liquid Crystal three-stable state film of the present invention presents adds Bragg reflection OFF state synoptic diagram.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one:
A kind of Polymer Dispersed Liquid Crystal three-stable state film, as shown in Figure 1, it comprises two sheets of flexible transparent conductive film 101,105 and is arranged at polymer dispersed liquid crystal layer 103 between the two sheets of flexible transparent conductive film 101,105, the inner surface of flexible transparent conductive film 101 is provided with electrically conducting transparent thin layer electrode 102, the inner surface of flexible transparent conductive film 105 is provided with electrically conducting transparent thin layer electrode 104, the thickness of polymer dispersed liquid crystal layer 103 is 30 μ m, and the mean diameter of the liquid crystal droplet 106 in the polymer dispersed liquid crystal layer 103 is 3～5 μ m; Polymer dispersed liquid crystal layer 103 mainly is to be stirred by prepolymer, chirality dual-frequency liquid crystal material and gasket material to be mixed and made into, the weight ratio of prepolymer and chirality dual-frequency liquid crystal material is 1: (1～3), the gasket material content in polymer dispersed liquid crystal layer is 1～10/mm
2, prepolymer, chirality dual-frequency liquid crystal material and gasket material specifically can be according to the actual conditions proportionings.The thickness of polymer dispersed liquid crystal layer of the present invention is got 30 μ m, be for better scattering states is arranged, this is because the big scattering number of times of liquid crystal droplet is few, and the thickness that increases polymer dispersed liquid crystal layer just can increase the number of the liquid crystal droplet that runs on the propagation path of light, has also just increased the scattering number of times.
In this specific embodiment, prepolymer mainly is made up of polymerisable monomer, chain-transferring agent and light trigger, and the percentage by weight of each component is: polymerisable monomer propoxyl group nonyl phenyl acrylate is 15～25%, the polymerisable monomer trimethylolpropane triacrylate is 65～75%, the chain-transferring agent decanedioic acid is 3～5%, light trigger 1173 (C
10H
12O
2, 2-hydroxy-2-methyl-1-propiophenone) and be 3～5%.When actual proportioning, can be 20% in polymerisable monomer propoxyl group nonyl phenyl acrylate, the polymerisable monomer trimethylolpropane triacrylate is 70%, the chain-transferring agent decanedioic acid is 5%, light trigger 1173 is that 5% ratio is carried out proportioning.
In this specific embodiment, the chirality dual-frequency liquid crystal material mainly is formulated by S811 liquid crystal chiral adjuvant and dual-frequency liquid crystal, and the mass ratio of S811 liquid crystal chiral adjuvant and dual-frequency liquid crystal is 1: 9; Dual-frequency liquid crystal is for being that 20% MBBA liquid crystal and mass percent are the potpourri that 80% DT91 liquid crystal is mixed with by mass percent; The pitch of chirality dual-frequency liquid crystal material is 0.5～2 μ m, and the Bragg reflection optical wavelength of chirality dual-frequency liquid crystal material is 0.75～3 μ m.The chirality dual-frequency liquid crystal material when low frequency dielectric anisotropy for just greater than 2; When frequency was 20kHz, dielectric anisotropy was zero; When frequency was 50kHz, dielectric anisotropy was-2.3.
In this specific embodiment, the refractive index n of polymkeric substance in the polymer dispersed liquid crystal layer 103
p, the liquid crystal ordinary light refractive index n
o, the non-ordinary light of liquid crystal refractive index n
eBe respectively 1.5～1.55,1.5～1.55,1.7～1.75; As being chosen as 1.517,1.517 and 1.717 respectively.
The little broken farmland of three-dimensional burnt awl attitude, the two dimension burnt awl big farmland of attitude and the three kinds of null field rock-steady structures in the big farmland of plane attitude are arranged in the liquid crystal droplet in the Polymer Dispersed Liquid Crystal three-stable state film of the present invention, optical characteristics is that the little broken farmland of three-dimensional burnt awl attitude has more intense scattering to incident light, is the scattering OFF state; There is more intense transmission on the big farmland of two dimension burnt awl attitude to incident light, is the transmission ON state; There is more intense selection Bragg reflection on attitude big farmland in plane to incident light, is the reflection OFF state.Principle of work with Polymer Dispersed Liquid Crystal three-stable state film of these three kinds of stable states is: apply about 25 volts low-frequency current field (as 25V between the electrically conducting transparent thin layer electrode, 50kHz), liquid crystal is rendered as the positivity cholesteric liquid crystal, being driven shows up causes nematic phase vertical plane arrangement original state, even liquid crystal molecule turns to direction of an electric field initial arrangement state 201, shown in Fig. 2 a; Remove electric field fast, at polymer drops chamber border restraint conditions and S811 liquid crystal chiral adjuvant is under master's the effect, the little broken farmland of three-dimensional burnt awl attitude configuration is arranged in formation along interface, polymer drops chamber, liquid crystal droplet promptly is not isotropic normal transparent liquid, neither anisotropy single axial birefringence crystal, incident light there is more intense scattering, makes Polymer Dispersed Liquid Crystal three-stable state film present scattering OFF state 202, shown in Fig. 2 b; Between the electrically conducting transparent thin layer electrode, apply about 25 volts low-frequency current field, slowly (falling voltage system with ladder) removes electric field then, under the effect of electric field restraint conditions and S811 liquid crystal chiral adjuvant and border, ball chamber restraint conditions, single liquid crystal droplet forms a big single domain configuration of burnt awl attitude, different liquid crystal droplets form the burnt awl of two dimension attitude in the whole Polymer Dispersed Liquid Crystal three-stable state film, and the big single domain of burnt awl attitude can be regarded as a big molecule of liquid crystal, the light vibration component parallel with screw axis is just perpendicular to liquid crystal molecule, so refractive index n
||=n
o, and the liquid crystal molecule of the light vibration component corresponding rotation vertical with screw axis, so refractive index n
⊥=(n
o+ n
e)/2, the refractive index of polymkeric substance and one of burnt awl attitude refractive index n
||=n
oCoupling is with n
⊥Do not match, incident light is had more intense transmission, make Polymer Dispersed Liquid Crystal three-stable state film be in translucent ON state 203, shown in Fig. 2 c; Between the electrically conducting transparent thin layer electrode, apply high-frequency electric field, liquid crystal is rendered as the negativity cholesteric liquid crystal, being driven shows up causes nematic phase along face arrangement attitude 204, shown in Fig. 2 d, slowly remove electric field, at electric field and S811 liquid crystal chiral adjuvant is that each liquid crystal droplet all forms the big farmland of plane attitude configuration under master's the effect, and plane attitude equivalent refractive index is (n
o+ n
e)/2, do not match with the refractive index of polymkeric substance, it is thicker to add Polymer Dispersed Liquid Crystal three-stable state film, can run into a plurality of liquid crystal droplets on the propagation path of light, so being in the visible light scattering, incident light Polymer Dispersed Liquid Crystal three-stable state film adds infrared light Bragg reflection OFF state 205, shown in Fig. 2 e.Therefore, Polymer Dispersed Liquid Crystal three-stable state film of the present invention can obtain special application in fields such as construction and decorations, sweltering heat OFF state in summer is in the plane attitude, reflects infrared light, winter, OFF state was in little farmland burnt awl attitude, scatter visible light and infrared light become the Energy Saving Windows new technology of the function dimming glass with energy-conserving and environment-protective notion, the new application.
The propoxyl group nonyl phenyl acrylate of above-mentioned use is the product that the special special surface of U.S.'s cyanogen technology company produces; Trimethylolpropane triacrylate is the product that the Tianjin Tianjiao Chemical Industry Co., Ltd produces; The chain-transferring agent decanedioic acid is the product that the chemical plant, Quzhou produces; Light trigger 1173 is products that the Beijing Yingli Technology Development Co.,Ltd produces; Dual-frequency liquid crystal is the dual-frequency liquid crystal product that Hebei Milestone Electronic Material Co., Ltd. provides, and the refractive index of its liquid crystal ordinary light is 1.517, and the refractive index of the non-ordinary light of its liquid crystal is 1.717; Flexible transparent conductive film is the transparent ITO conducting film product that Hunan Sancai Photoelectric Information Material Co., Ltd. produces; Gasket material adopts Shenzhen to receive the product that little scientific ﹠ technical corporation produces, and it is the plastic microsphere of 30 μ m for diameter.
Embodiment two:
Preparation embodiment one described Polymer Dispersed Liquid Crystal three-stable state film is to carry out in the workshop of ultrapurification, and the preparation method mainly may further comprise the steps:
1. by weight 1: (1～3) takes by weighing prepolymer and chirality dual-frequency liquid crystal material, and with 1～10/mm
2Content add gasket material, at normal temperatures prepolymer, chirality dual-frequency liquid crystal material and gasket material are stirred mixing; At this, prepolymer, chirality dual-frequency liquid crystal material and gasket material specifically can be according to the actual conditions proportionings.
Prepolymer mainly is made up of polymerisable monomer, chain-transferring agent and light trigger, and the percentage by weight of each component is: polymerisable monomer propoxyl group nonyl phenyl acrylate is 20%, the polymerisable monomer trimethylolpropane triacrylate is 70%, the chain-transferring agent decanedioic acid is 5%, light trigger 1173 is 5%.
The chirality dual-frequency liquid crystal material mainly is formulated by S811 liquid crystal chiral adjuvant and dual-frequency liquid crystal, and the mass ratio of S811 liquid crystal chiral adjuvant and dual-frequency liquid crystal is 1: 9; Dual-frequency liquid crystal is for being that 20% MBBA liquid crystal and mass percent are the potpourri that 80% DT91 liquid crystal is mixed with by mass percent.
2. on the inner surface of two sheets of flexible transparent conductive film, etch the electrically conducting transparent thin layer electrode respectively.
The potpourri transfer printing that 3. will evenly mix brushes between the two sheets of flexible transparent conductive film.
4. the two sheets of flexible transparent conductive film that utilizes the pressing machine will be printed with potpourri is squeezed into composite membrane.
5. the UV-irradiation composite membrane 1～3 minute that uses medium tenacity (about 25mW) fully separates out liquid crystal so that composite membrane is separated from polymkeric substance, forming mean diameter is the liquid crystal droplet of 3～5 μ m, solidifies liquid crystal droplet simultaneously.At this, be separated and solidify processing and can adopt UV-curing technology, also can adopt the heat curing technology.
Above-mentioned preparation method prepares Polymer Dispersed Liquid Crystal three-stable state film to be had scattering OFF state, translucent ON state and visible light scattering and adds three kinds of stable states of infrared light Bragg reflection OFF state, when between the electrically conducting transparent thin layer electrode, applying low frequency or DC electric field, after removing low frequency or DC electric field fast then, Polymer Dispersed Liquid Crystal three-stable state film presents the scattering OFF state; When between the electrically conducting transparent thin layer electrode, applying low frequency or DC electric field, fall after voltage system removes low frequency or DC electric field with ladder then, Polymer Dispersed Liquid Crystal three-stable state film presents translucent ON state; When between the electrically conducting transparent thin layer electrode, applying high-frequency electric field, fall after voltage system removes low frequency or DC electric field with ladder then, Polymer Dispersed Liquid Crystal three-stable state film presents the visible light scattering and adds infrared light Bragg reflection OFF state.
Claims (10)
1. Polymer Dispersed Liquid Crystal three-stable state film, it is characterized in that comprising the two sheets of flexible transparent conductive film and be arranged at polymer dispersed liquid crystal layer between the described flexible transparent conductive film, the inner surface of described flexible transparent conductive film is provided with the electrically conducting transparent thin layer electrode, and described polymer dispersed liquid crystal layer mainly is to be stirred by prepolymer, chirality dual-frequency liquid crystal material and gasket material to be mixed and made into.
2. a kind of Polymer Dispersed Liquid Crystal three-stable state film according to claim 1, the thickness that it is characterized in that described polymer dispersed liquid crystal layer is 30 μ m, the weight ratio of described prepolymer and described chirality dual-frequency liquid crystal material is 1: (1～3), the content of described gasket material in described polymer dispersed liquid crystal layer is 1～10/mm
2
3. a kind of Polymer Dispersed Liquid Crystal three-stable state film according to claim 1 and 2, it is characterized in that described prepolymer mainly is made up of polymerisable monomer, chain-transferring agent and light trigger, the percentage by weight of each component is: polymerisable monomer propoxyl group nonyl phenyl acrylate is 15～25%, the polymerisable monomer trimethylolpropane triacrylate is 65～75%, the chain-transferring agent decanedioic acid is 3～5%, light trigger 1173 is 3～5%.
4. a kind of Polymer Dispersed Liquid Crystal three-stable state film according to claim 3 is characterized in that the percentage by weight of described polymerisable monomer, described chain-transferring agent and described light trigger is: polymerisable monomer propoxyl group nonyl phenyl acrylate is 20%, the polymerisable monomer trimethylolpropane triacrylate is 70%, the chain-transferring agent decanedioic acid is 5%, light trigger 1173 is 5%.
5. a kind of Polymer Dispersed Liquid Crystal three-stable state film according to claim 3, it is characterized in that described chirality dual-frequency liquid crystal material mainly is formulated by S811 liquid crystal chiral adjuvant and dual-frequency liquid crystal, the mass ratio of described S811 liquid crystal chiral adjuvant and described dual-frequency liquid crystal is 1: 9; Described dual-frequency liquid crystal is for being that 20% MBBA liquid crystal and mass percent are the potpourri that 80% DT91 liquid crystal is mixed with by mass percent.
6. a kind of Polymer Dispersed Liquid Crystal three-stable state film according to claim 5, the pitch that it is characterized in that described chirality dual-frequency liquid crystal material is 0.5～2 μ m, the Bragg reflection optical wavelength of described chirality dual-frequency liquid crystal material is 0.75～3 μ m.
7. a kind of Polymer Dispersed Liquid Crystal three-stable state film according to claim 5 is characterized in that described gasket material is that diameter is the plastic microsphere of 30 μ m.
8. a kind of Polymer Dispersed Liquid Crystal three-stable state film according to claim 1 is characterized in that the refractive index of polymkeric substance in the described polymer dispersed liquid crystal layer, the refractive index of liquid crystal ordinary light, the refractive index of the non-ordinary light of liquid crystal are respectively 1.5～1.55,1.5～1.55,1.7～1.75.
9. the preparation method of a Polymer Dispersed Liquid Crystal three-stable state film is characterized in that may further comprise the steps:
1. by weight 1: (1～3) takes by weighing prepolymer and chirality dual-frequency liquid crystal material, and with 1～10/mm
2Content add gasket material, at normal temperatures prepolymer, chirality dual-frequency liquid crystal material and gasket material are stirred mixing;
Described prepolymer mainly is made up of polymerisable monomer, chain-transferring agent and light trigger, and the percentage by weight of each component is: polymerisable monomer propoxyl group nonyl phenyl acrylate is 15～25%, the polymerisable monomer trimethylolpropane triacrylate is 65～75%, the chain-transferring agent decanedioic acid is 3～5%, light trigger 1173 is 3～5%;
Described chirality dual-frequency liquid crystal material mainly is formulated by S811 liquid crystal chiral adjuvant and dual-frequency liquid crystal, and the mass ratio of described S811 liquid crystal chiral adjuvant and described dual-frequency liquid crystal is 1: 9; Described dual-frequency liquid crystal is for being that 20% MBBA liquid crystal and mass percent are the potpourri that 80% DT91 liquid crystal is mixed with by mass percent;
2. on the inner surface of two sheets of flexible transparent conductive film, etch the electrically conducting transparent thin layer electrode respectively;
The potpourri transfer printing that 3. will evenly mix brushes between the two sheets of flexible transparent conductive film;
4. the two sheets of flexible transparent conductive film that utilizes the pressing machine will be printed with potpourri is squeezed into composite membrane;
5. composite membrane is separated, liquid crystal is fully separated out from polymkeric substance, forming mean diameter is the liquid crystal droplet of 3～5 μ m, solidifies liquid crystal droplet simultaneously.
10. the preparation method of Polymer Dispersed Liquid Crystal three-stable state film according to claim 9, it is characterized in that described Polymer Dispersed Liquid Crystal three-stable state film has scattering OFF state, translucent ON state and visible light scattering and adds three kinds of stable states of infrared light Bragg reflection OFF state, when between the electrically conducting transparent thin layer electrode, applying low frequency or DC electric field, after removing low frequency or DC electric field fast then, Polymer Dispersed Liquid Crystal three-stable state film presents the scattering OFF state; When between the electrically conducting transparent thin layer electrode, applying low frequency or DC electric field, fall after voltage system removes low frequency or DC electric field with ladder then, Polymer Dispersed Liquid Crystal three-stable state film presents translucent ON state; When between the electrically conducting transparent thin layer electrode, applying high-frequency electric field, fall after voltage system removes low frequency or DC electric field with ladder then, Polymer Dispersed Liquid Crystal three-stable state film presents the visible light scattering and adds infrared light Bragg reflection OFF state.
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| CN109917594A (en) * | 2019-03-19 | 2019-06-21 | 华南师范大学 | A kind of secret protection infrared external reflection smart window and preparation method thereof |
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