CN1776483A - Method for manufacturing liquid crystal polarizer capable of realizing wide wave reflection - Google Patents
Method for manufacturing liquid crystal polarizer capable of realizing wide wave reflection Download PDFInfo
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- CN1776483A CN1776483A CN 200510086996 CN200510086996A CN1776483A CN 1776483 A CN1776483 A CN 1776483A CN 200510086996 CN200510086996 CN 200510086996 CN 200510086996 A CN200510086996 A CN 200510086996A CN 1776483 A CN1776483 A CN 1776483A
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Abstract
Mixed liquid crystal is prepared by mixing liquid crystal in cholesteryl phase, light enable polymerizing monomer and photoinitiator. Pitch of liquid crystal in cholesteryl phase is changed as variety of temperature. The prepared mixed liquid crystal is injected to liquid crystal box or thin film, which does not receive surface treatment or orientation treatment along surface. The liquid crystal is in state of transparent plane texture, and mixed liquid crystal is still in cholesteryl phase. Ultraviolet irradiation is carried out to cross link the monomer to form macromolecule network; and after irradiation, heating up or down it obtains polarizing film of liquid crystal in broadband. Advantages are: obtaining reflective polarizing film of liquid crystal in broadband, and different reflective widths dependent on temperature. Thus, the invention is applicable to energy saving glass for example since reflective wave band can be adjusted by temperature.
Description
Technical field
The invention belongs to lcd technology, a kind of method for manufacturing liquid crystal polarizer that can realize wide wave reflection particularly is provided, make cholesteric liquid crystal realize the manufacturing of the liquid crystal polarizer of wide wave reflection.
Background technology
Liquid crystal is a kind of specific form that the occurring in nature material exists.The difference of itself and crystal and common liq is that in liquid crystal state the barycenter of liquid crystal molecule is unordered (crystal is orderly), and its sensing is orderly (common liq is unordered).Thereby liquid crystal is a kind of optically anisotropic substance of external field sensitive.Because this special structure, liquid crystal can be modulated light, thereby is widely used in the demonstration field.
Cholesteric liquid crystal is the nematic liquid crystal that has chirality.Two kinds of sources are generally arranged: the one, itself has chiral radicals liquid crystal molecule, thereby damage is the nematic phase that has helical structure, i.e. cholesteric phase naturally; Another kind of situation is to mix chipal compounds in nematic liquid crystal, makes to the structure of lising to be distorted, and obtains cholesteric phase.In a single-domain body, cholesteric phase molecule and screw axis homeotropic alignment in the plane perpendicular to screw axis, can be thought nematic phase; On the direction of screw axis, continuous change takes place in the sensing of cholesteric liquid crystal molecule, when it revolves three-sixth turn the length of screw axis of process be called as pitch (representing) with P.
Because this special structure, cholesteric liquid crystal can be to satisfying bragg's formula: the light selective reflecting of λ=nP (n is the mean refractive index of liquid crystal).The width of reflectance spectrum is: | n
eP-n
oP|, wherein n
eAnd n
oBe respectively the refractive index of liquid crystal extraordinary ray and ordinary light.Indication " wide ripple " is exactly the width of reflectance spectrum herein, and it specifically is defined as respective wavelength poor that reflection reaches maximum reflectivity 50% in the bands of a spectrum.In visible-range, the width of general reflectance spectrum is about 100nm.If think further to increase reflection bandwidth, under existing condition, can only set about from P.Therefore the method that various realization pitch uneven distributions occurred.People such as Chen Yuwen (CN03131368.X) utilize the method that produces inhomogeneous field on electrode, and the liquid crystal pitch near electrode is increased, and constant substantially away from the liquid crystal pitch of electrode, thereby reflection bandwidth is increased.The main deficiency of this kind method is to need electrode and is the electrode of special shape, introduce its optical property of electrode pair and exert an influence in reflectance coating, and electrode also is difficult to processing.People such as D.J.Broer (CN97191106.1) use the composite system (comprising photopolymerization cholesterol acrylate, photopolymerization nematic phase acrylate, fuel etc.) of photopolymerization, and (radiation intensity is less than 0.05mW/cm to utilize very weak ultraviolet ray
2) shine, make monomer have adequate time to spread, form pitch gradient, thereby obtain polaroid whole visible light wave range (more than the bandwidth 300nm) selective reflecting.Because the degree that monomer spreads in liquid crystal is relevant with UV radiation intensity, therefore the formed bandwidth of this method is very responsive to ultraviolet irradiation intensity, therefore in manufacture process, to use the monochromatic light sensor that polaroid is detected, in case reach required bandwidth, will improve ultraviolet irradiation intensity at once.Its equipment is complicated, difficult control.
Summary of the invention
The object of the present invention is to provide a kind of method for manufacturing liquid crystal polarizer that can realize wide wave reflection, by fairly simple technology, make a kind of liquid crystal polarizer that can realize wide wave reflection, it is complicated to have overcome equipment, problem more rambunctious.
The concrete technology of manufacturing of the present invention is:
1, mixed liquid crystal: by mixing of the temperature variant cholesteric liquid crystal of a kind of pitch, photopolymerizable monomer and light trigger.Its cholesteric liquid crystal is mixed by nematic liquid crystal and chipal compounds, and wherein the content of chipal compounds is: 1%-30%.This cholesteric liquid crystal is the 10%-90% or the 110%-1000% of its irradiation temperature pitch in the pitch of serviceability temperature.The content of photopolymerizable monomer in the liquid crystal that finally uses is 0.1%-30%, and the content of light trigger is the 0.1%-10% of photopolymerizable monomer.
2, will inject liquid crystal cell or the film of doing the surface processing or doing planar orientation processing (available rubbing manipulation, Vacuum Coating method, chemical method etc.) by the liquid crystal that mentioned component is mixed, liquid crystal is in transparent planar texture (planartexture) state, sees Figure 1A; Be lower than serviceability temperature 1-100 ℃ or be higher than serviceability temperature 1-100 ℃ temperature, and mixed system still is under the state of cholesteric phase, carries out ultraviolet irradiation, makes the monomer crosslinked one-tenth macromolecule network of photopolymerizable, see Figure 1B, according to the different exposure intensities of material be: 0.001-100mW/cm
2Heat up after the irradiation or be cooled to serviceability temperature, obtain broadband liquid crystal polarizer.
Different according to irradiation temperature with the height of serviceability temperature, and cholesteric liquid crystal varies with temperature the difference of trend, the thermodynamic equilibrium pitch of serviceability temperature may be greater than (Fig. 1 C) or less than the balance pitch of (Fig. 1 D) irradiation temperature, broadens to | n thereby can access reflected waveband
eP
2-n
oP
1|, can obtain the liquid crystal polarizer that reflection wavelength broadened and please refer to Fig. 2.Certainly, this is at the positivity liquid crystal, if negative liquid crystal, then reflected waveband broaden to: | n
oP
2-n
eP
1|.
The present invention uses the temperature variant cholesteric liquid crystal of aforesaid pitch; Irradiation temperature is different with serviceability temperature, thereby the pitch of these two temperature is also different; Make the pitch of irradiation temperature be aggregated remaining of thing network portion by ultraviolet irradiation; Thereby, will return to the pitch of this temperature away from the zone of network in serviceability temperature, and then near the pitch of irradiation temperature, thereby form the pitch difference of zones of different near the zone of polymkeric substance, the wavelength of polaroid reflection is broadened.
Chipal compounds of the present invention also can be cholesterol and derivant, cellulose and derivant thereof etc., and its helically twisted power increases with the reduction of temperature or reduce, thereby causes its pitch to change by aforementioned range.
The active function groups of photopolymerizable monomer of the present invention can be acryloyl group, methacryl, vinyl, styryl, diacetyl etc., and the quantity of active function groups can 1～5.
Light trigger of the present invention can be selected from following material: dibenzoyl peroxide, dilauroyl peroxide, azoisobutyronitrile, ABVN, di-isopropyl peroxydicarbonate, di-cyclohexylperoxy di-carbonate etc.
Constituent of the present invention is except that above-mentioned several compositions: photo-polymerizable liquid crystal monomer, liquid crystal, chipal compounds, the light trigger, also can be according to selected composition, technology and actual demand, and whether decision adds other components such as polymerization inhibitor, dyestuff.
Advantage or good effect
Can realize broadband reflective liquid crystal polaroid, and the reflection width of this polaroid is different with the difference of serviceability temperature, therefore can be applied in some need utilize the temperature occasion of accommodation reflex wave band voluntarily, as energy-conservation glass etc.In addition, this method is not very sensitive to UV intensity, and the wide sensitivity to temperature of institute's reflection wave depends on chipal compounds or the cholesteric liquid crystal itself that is mixed, and does not have much relations with UV intensity, thereby process equipment is simple.
Description of drawings
Fig. 1 utilizes the present invention to make the concrete grammar synoptic diagram of the liquid crystal polarizer of wide wave reflection.Figure 1A is not for passing through the liquid crystal synoptic diagram of the planar texture state that is in of UV radiation, Figure 1B is the process UV radiation, monomer forms the synoptic diagram of polymer network, Fig. 1 C is under serviceability temperature, liquid crystal pitch away from polymer network becomes big synoptic diagram, Fig. 1 D is under serviceability temperature, the synoptic diagram that diminishes away from the liquid crystal pitch of polymer network.Wherein, the polymer network 4 that substrate 1, the cholesteric liquid crystal 2 that is in the planar texture state, ultraviolet source 3, photopolymerizable monomer are cross-linked to form, under serviceability temperature, liquid crystal pitch away from polymkeric substance, it becomes big greater than the pitch 5 that is aggregated the fixing irradiation temperature of thing, pitch, under serviceability temperature, away from the liquid crystal pitch of polymkeric substance, it is less than the pitch 6 that is aggregated the fixing irradiation temperature of thing.
The schematic diagram that Fig. 2 broadens for the liquid crystal polarizer reflected waveband.Wherein, n
oBe ordinary refraction index, n
eBe the extraordinary ray refractive index,
Be mean refractive index, P
1Be less pitch, P
2Be bigger pitch.
Fig. 3 has illustrated the structure of some compounds.Wherein, A is a kind of photopolymerizable monomer, and B is the chipal compounds that a kind of helically twisted power raises and increases with temperature, and C, D are the chipal compounds that two kinds of helically twisted power raise and reduce with temperature.
Embodiment
Below with several reasonable embodiment concrete method for making of the present invention is described.
The E48 that uses Merck company is as nematic liquid crystal, and chipal compounds uses the B compound among Fig. 3, content from 10 to 30 all can, decide on required reflected waveband.The content of preferred B is weight ratio 23% herein.The helically twisted power of compd B raises with temperature and increases, and the liquid crystal pitch of therefore sneaking into this compound raises with temperature and reduces.In this preferred embodiment, the pitch of potpourri is 1.7um about 0 degree centigrade, and is 0.4um in the time of 50 degrees centigrade, and its pitch descends significantly.In potpourri, sneak into 4% monomer A (Fig. 3) and 0.8% light trigger (2,2-dimethoxy-2-phenyl-acetophenone).Potpourri is made the thick liquid crystal cell of 80um, under the state of planar texture, use 365nm, 0.1mW/cm
2Ultraviolet light in the time of 5 degrees centigrade, shone about 20 minutes, polymer network will be fixed up a part of liquid crystal molecule and pitch thereof.Like this, in the time of 5 degrees centigrade, the wavelength of this polaroid reflection is between 2050-2400nm; The rising temperature, the fixing pitch of a part of low temperature will continue to keep, and in the time of 40 degrees centigrade, reflected range is between the 950-2400nm; Under 50 degrees centigrade, reflected range is between the 800-2400nm.Therefore, its reflection wavelength is sent out along with the difference of serviceability temperature to go up and is changed, and the waveband width of reflection significantly increases.Certainly, utilize this potpourri, also the mode that can adopt serviceability temperature to be lower than processing temperature is processed.As shining at 40 degrees centigrade, its method is identical with preceding method, and at this moment its reflected waveband is cooled to 5 degrees centigrade with it after the irradiation between 700-880nm, and then reflected waveband increases to 800-2400nm.
Lifting one below again uses helically twisted power with the raise preferred version of the chipal compounds that reduces of temperature.Employed chipal compounds can be C or the D among Fig. 3.Employed liquid crystal is the SLC-1717 of strength gram, and polymerisable monomer still uses compd A, and it is general 184 or 651 that light trigger adopts, and content is the 1%-10% of content of monomer.These two kinds of compounds mix the back liquid crystal with liquid crystal pitch all increases with the temperature rising, and in preferred example, the content of chipal compounds C is 5.2%, and monomer A content is 5%, and light trigger adopts 184, and content is 0.5%, thickness of liquid crystal box 50um.The pitch of liquid crystal is 0.96um in the time of 30 degrees centigrade, and the pitch of liquid crystal is 1.38um in the time of 80 degrees centigrade.At 30 degrees centigrade, the ultraviolet of 365nm, 0.01mW/cm
2Under shone 30 minutes.Then 30 when spending, and the wavelength band of its reflection is 1340-1530nm, if rising temperature to 80 degree, then its reflected range becomes 1350-2200nm, and width is about 850nm.Use the example of compd B identical with last one, also can shine at high temperature, low temperature uses, and as carrying out ultraviolet irradiation at 80 degree, 30 degree are tested the reflection width that also will obtain about 800nm.Adopting an example of Compound D is when its content is 8% left and right sides, and irradiation temperature is 80 degree, and serviceability temperature is under the situation of 30 degree, can obtain the reflection width of about 450nm.Certainly, if reduce the content of D, its width will further increase, but may be at the region of ultra-red of 3000nm.
Claims (3)
1, a kind of method for manufacturing liquid crystal polarizer that can realize wide wave reflection is characterized in that: concrete manufacturing process is:
A, mixed liquid crystal: by mixing of the temperature variant cholesteric liquid crystal of a kind of pitch, photopolymerizable monomer and light trigger; Its cholesteric liquid crystal is mixed by nematic liquid crystal and chipal compounds, and wherein the content of chipal compounds is: 1%-30%; This cholesteric liquid crystal is the 10%-90% or the 110%-1000% of its irradiation temperature pitch in the pitch of serviceability temperature; The content of photopolymerizable monomer in the liquid crystal that finally uses is 0.1%-30%, and the content of light trigger is the 0.1%-10% of photopolymerizable monomer;
B, the liquid crystal that will be mixed by mentioned component inject to be done the surface and handles or make liquid crystal cell or the film that planar orientation is handled, and liquid crystal is in transparent planar texture state; Be lower than serviceability temperature 1-100 ℃ or be higher than serviceability temperature 1-100 ℃ temperature, and mixed system still is under the state of cholesteric phase, carry out ultraviolet irradiation, make the monomer crosslinked one-tenth macromolecule network of photopolymerizable, according to the different exposure intensities of material be: 0.001-100mW/cm
2Heat up after the irradiation or be cooled to serviceability temperature, obtain broadband liquid crystal polarizer.
2, in accordance with the method for claim 1, it is characterized in that: described planar orientation is handled and is adopted rubbing manipulation, Vacuum Coating method or chemical method.
3, in accordance with the method for claim 1, it is characterized in that: described chipal compounds is cholesterol and derivant or cellulose and derivant thereof, and its helically twisted power increases with the reduction of temperature or reduces; The active function groups of described photopolymerizable monomer is acryloyl group, methacryl, vinyl, styryl, diacetyl, and the quantity of active function groups is 1～5; Described light trigger is selected dibenzoyl peroxide, dilauroyl peroxide, azoisobutyronitrile, ABVN, di-isopropyl peroxydicarbonate or di-cyclohexylperoxy di-carbonate.
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Cited By (7)
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|---|---|---|---|---|
| CN102621617A (en) * | 2012-02-29 | 2012-08-01 | 北京科技大学 | Production method for nano-doped electric field controlled liquid crystal round polaroid |
| CN102722053A (en) * | 2012-06-15 | 2012-10-10 | 合肥工业大学 | Cholesteric liquid crystal display device with adjustable reflection bandwidth |
| CN103144581A (en) * | 2013-03-29 | 2013-06-12 | 苏州启智机电技术有限公司 | Cooling structure for vehicle |
| CN104046368A (en) * | 2014-06-09 | 2014-09-17 | 京东方科技集团股份有限公司 | Liquid crystal thin film and preparation method thereof, temperature response apparatus and circular polarizer |
| CN104199215A (en) * | 2014-08-21 | 2014-12-10 | 深圳市华星光电技术有限公司 | Polarized light modulation device and manufacturing method thereof |
| CN113391492A (en) * | 2021-06-23 | 2021-09-14 | 北京科技大学 | Near-infrared light shielding film material, preparation method and application |
| CN115093588A (en) * | 2022-07-14 | 2022-09-23 | 华南师范大学 | Cellulose nanocrystalline film and preparation method and application thereof |
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2005
- 2005-11-25 CN CN 200510086996 patent/CN1776483A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621617B (en) * | 2012-02-29 | 2014-03-26 | 北京科技大学 | Production method for nano-doped electric field controlled liquid crystal round polaroid |
| CN102621617A (en) * | 2012-02-29 | 2012-08-01 | 北京科技大学 | Production method for nano-doped electric field controlled liquid crystal round polaroid |
| CN102722053B (en) * | 2012-06-15 | 2015-04-01 | 合肥工业大学 | Cholesteric liquid crystal display device with adjustable reflection bandwidth |
| CN102722053A (en) * | 2012-06-15 | 2012-10-10 | 合肥工业大学 | Cholesteric liquid crystal display device with adjustable reflection bandwidth |
| CN103144581A (en) * | 2013-03-29 | 2013-06-12 | 苏州启智机电技术有限公司 | Cooling structure for vehicle |
| CN104046368A (en) * | 2014-06-09 | 2014-09-17 | 京东方科技集团股份有限公司 | Liquid crystal thin film and preparation method thereof, temperature response apparatus and circular polarizer |
| CN104046368B (en) * | 2014-06-09 | 2016-02-24 | 京东方科技集团股份有限公司 | A kind of liquid crystal film and preparation method thereof and temperature response device, circular polarizing disk |
| US9631143B2 (en) | 2014-06-09 | 2017-04-25 | Boe Technology Group Co., Ltd. | Liquid crystal film, method for preparing the film, temperature-responsive device comprising the film, and circular polarizer made therefrom |
| CN104199215A (en) * | 2014-08-21 | 2014-12-10 | 深圳市华星光电技术有限公司 | Polarized light modulation device and manufacturing method thereof |
| CN104199215B (en) * | 2014-08-21 | 2017-03-15 | 深圳市华星光电技术有限公司 | A kind of polarization optic modulating device and preparation method thereof |
| CN113391492A (en) * | 2021-06-23 | 2021-09-14 | 北京科技大学 | Near-infrared light shielding film material, preparation method and application |
| CN115093588A (en) * | 2022-07-14 | 2022-09-23 | 华南师范大学 | Cellulose nanocrystalline film and preparation method and application thereof |
| CN115093588B (en) * | 2022-07-14 | 2023-11-03 | 华南师范大学 | Cellulose nanocrystalline film and preparation method and application thereof |
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