CN104698668A - Nano conducting particle doped PDLC (polymer dispersed liquid crystal) membrane and preparation method thereof - Google Patents
Nano conducting particle doped PDLC (polymer dispersed liquid crystal) membrane and preparation method thereof Download PDFInfo
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- CN104698668A CN104698668A CN201510145700.4A CN201510145700A CN104698668A CN 104698668 A CN104698668 A CN 104698668A CN 201510145700 A CN201510145700 A CN 201510145700A CN 104698668 A CN104698668 A CN 104698668A
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- pdlc
- liquid crystal
- film
- membrane
- nano conducting
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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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/54—Polymerisation initiated by wave energy or particle radiation by X-rays or electrons
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
Abstract
The invention provides a nano conducting particle doped PDLC (polymer dispersed liquid crystal) membrane. The nano conducting particle doped PDLC is prepared by stirring polyurethane modified by acrylic acid, a TMPTA (trimethylolpropane triacrylate) monomer thinner, grapheme nano conductive particles, an antifoaming agents and liquid crystal for 60-120 minutes under the constant temperature ranging from 100r/min to 300r/min and subjecting the same to radiation curing with an electron beam 150-300keV in energy for 0.1-0.3 seconds. The grapheme nano conduction particles are combined with a traditional PDLC membrane, driving voltage of the PDLC membrane is lowered from dielectric constant and liquid crystal orientation, main materials for preparing the PDLC membrane are not needed to be changed, original optical-electrical characteristics of the PDLC are guaranteed, the driving voltage of the PDLC membrane is low, good thermal stability and mechanical stability are achieved, and simpleness in preparation process is realized.
Description
Technical field
The present invention relates to a kind of PDLC film and preparation method thereof, be specifically related to a kind of PDLC film mixing nano conducting powders and preparation method thereof.
Background technology
Polymer Dispersed Liquid Crystal (Polymer Dispersed Liquid Crystal, be called for short PDLC) be a kind of liquid crystal is dispersed in polymer matrix Liquid Crystal/Polymer compound substance with droplet form, it has electric field-tunable control and good electro-optical characteristic, relative low price, be easy to processing, and be widely used, can be used as electrooptical window, liquid crystal light threshold, phase grating, hologram recording film etc., is the popular research topic in current display technique field.
It is generally acknowledged, the principle of work of PDLC is: PDLC is made up of polymeric matrix and liquid crystal droplet, wherein the optical axis of liquid crystal has electric field-tunable control, when adding enough driving voltages, liquid crystal optic axis presents consistent arranged in parallel by electric field action along direction of an electric field, thus liquid crystal molecule optical axis direction in all liquid crystal droplets is consistent, now liquid crystal droplet and refractive index polymer reach complete matching status, scattering is not had between high molecular polymer and liquid crystal molecule, therefore light transmission rate increases, if extra electric field field intensity is fully large, vertical transmitance will reach maximum, for ON state, when extra electric field disappears, due to the grappling effect between liquid crystal molecule and high molecular polymer interface, liquid crystal molecule optical axis is mixed and disorderly, all droplets are also unordered arrangements, because liquid crystal molecule has stronger optical anisotropy and dielectric anisotropy, the ordinary refraction index of liquid crystal droplet and refractive index polymer mismatch, therefore there is scattering process mutually between droplet and high molecular polymer, now the vertical transmitance of incident light is extremely low, PDLC appearance is opaque milky white state, is OFF state.
Based on the application of PDLC, due to fundamental research and process conditions, equipment aspect, be difficult to realize commercialization.The driving voltage that wherein PDLC is relatively high becomes it to be difficult to realize one of business-like reason, thus contrast and the driving voltage that can effectively reduce PDLC while the response time is being kept to become large difficult point and the focus improveing PDLC photoelectric properties, but the current technique improvement method for driving voltage mainly concentrates on the chemosynthesis replacement of liquid crystal and polymkeric substance itself, the research of film-forming process or the change of type of drive, these methods all have improvement to a certain degree to material photoelectric properties, but preparation process complicated operation is also higher to equipment requirement.
Summary of the invention
The object of the invention is to solve the deficiencies in the prior art, and provide a kind of and mix graphene nano conducting particles, PDLC film that driving voltage is low and preparation method thereof.
Realizing the technical scheme that the object of the invention adopts is, mix a PDLC film for nano conducting powders, be prepared from through mixing, solidification by the liquid crystal of the TMPTA monomer diluent of the acrylic acid modified polyurethane of 30 ~ 40 mass parts, 10 ~ 20 mass parts, the graphene nano conducting particles of 4 ~ 6 mass parts, the silicone defoaming agent of 2 ~ 3 mass parts and 40 ~ 50 mass parts.
The present invention is the corresponding preparation method providing the PDLC film mixing nano conducting powders also, comprises the steps:
(1) acrylic acid modified polyurethane, TMPTA monomer diluent, graphene nano conducting particles and defoamer are mixed obtain polymeric matrix, in polymeric matrix, add liquid crystal and stir 60 ~ 120 minutes with the rotating speed of 100 ~ 300r/min under normal temperature state, obtaining PDLC pre-polymerization slurry;
(2) adopting painting to scrape technique is coated in the release liners of surfacing by PDLC pre-polymerization slurry, coating thickness is 1 ~ 20mm, with after through energy be 150 ~ 300keV within electron beam radiation cured 0.1 ~ 0.3 second, make PDLC pre-polymerization slurry curing film forming, film is peeled off from release liners, obtains PDLC film.
As shown from the above technical solution, PDLC film provided by the invention is in polymeric matrix, be mixed with appropriate graphene nano conducting particles, and graphene nano conducting particles is dispersed in polymeric matrix, reduce the specific inductive capacity of polymeric matrix, because the specific inductive capacity being in the liquid crystal droplet in PDLC film together does not change, therefore during impressed voltage, the voltage that liquid crystal droplet is got increases, liquid crystal optic axis and direction of an electric field angle reduce, therefore under identical DC Electric Field, when other conditions such as materials chemistry component are all constant, compared to the PDLC film of nano conducting powders graphene-doped in liquid crystal and the PDLC film of not graphene-doped nano conducting powders, this in polymeric matrix the PDLC film of graphene-doped nano conducting powders be more easily subject to the effect of electric field, transmitance changes faster, therefore this PDLC film has lower driving voltage.
It is graphene nano conducting particles that PDLC film provided by the invention mixes nano conducting powders, Graphene is the radio frequency nano material that self dipole moment is comparatively large, can produce larger induce dipole moment, thus can turn under electric field change, the direction of optic axis of the liquid crystal droplet be scattered in equally in polymeric matrix can be helped, reduce the change time of transmitance, thus play the auxiliary effect reducing driving voltage; The silicone defoaming agent used has excellent flexibility and greasy property, and antifoam performance is good, is conducive to the quality of the PDLC film improving preparation.
The preparation method of PDLC film provided by the invention, before solidification, raw material is stirred 60 ~ 120 minutes with the rotating speed of 100 ~ 300r/min under normal temperature state, graphene nano conducting particles is made to be uniformly distributed in polymeric matrix, liquid crystal is droplets and is uniformly distributed in PDLC pre-polymerization slurry, finally adopt to be coated with and scrape technique PDLC pre-polymerization slurry coating is made it film-forming through electron beam radiation cured in the release liners of surfacing, the film after solidification is directly peeled off release liners and obtains this PDLC film.Research finds, large calorimetric is produced during UV photocuring PDLC pre-polymerization slurry, impact is had on the stock surface quality of PDLC film attachment, and then the PDLC film quality of impact preparation, the present invention adopts electron beam radiation cured preparation PDLC film, due to electron beam radiation cured not heat production, release liners therefore can be used as stock, solidify when the PDLC film that obtains is peeled off and do not need to use solvent or ultraviolet light, can directly peel off and the PDLC film thickness prepared thinner evenly.
Compared with prior art, the PDLC film mixing nano conducting powders provided by the invention, graphene nano conducting particles is combined with traditional PDLC film, the driving voltage of PDLC film is reduced from specific inductive capacity and liquid crystal aligning aspect, must not change preparation PDLC film body material used itself, thus ensure that the original photoelectric characteristic of PDLC film, the driving voltage of this PDLC film is low, and have good thermal stability and mechanical stability, preparation technology is simple.
Embodiment
Illustrate in detail the present invention below in conjunction with embodiment, content of the present invention is not limited to following examples.Embodiment 1:
Take following raw material for standby:
Above-mentioned raw materials is stirred with the rotating speed of 300r/min under normal temperature state and within 60 minutes, obtains PDLC pre-polymerization slurry, with after through hot-melt scrape release liners that PDLC pre-polymerization slurry to be coated in surfacing by machinery is coated with scrape to 20mm thick, then enter electron beam radiation cured equipment through electron beam radiation cured 0.1 second of energy 300keV, the film after solidification is peeled off from release liners and obtains required PDLC film.
Embodiment 2:
Take following raw material for standby:
Above-mentioned raw materials is stirred with the rotating speed of 200r/min under normal temperature state and within 120 minutes, obtains PDLC pre-polymerization slurry, with after through hot-melt scrape release liners that PDLC pre-polymerization slurry to be coated in surfacing by machinery is coated with scrape to 10mm thick, then enter electron beam radiation cured equipment through electron beam radiation cured 0.1 second of energy 200keV, the film after solidification is peeled off from release liners and obtains required PDLC film.
Embodiment 3:
Take following raw material for standby:
Above-mentioned raw materials is stirred with the rotating speed of 100r/min under normal temperature state and within 120 minutes, obtains PDLC pre-polymerization slurry, with after through hot-melt scrape release liners that PDLC pre-polymerization slurry to be coated in surfacing by machinery is coated with scrape to 20mm thick, then enter electron beam radiation cured equipment through electron beam radiation cured 0.3 second of energy 300keV, the film after solidification is peeled off from release liners and obtains required PDLC film.
Claims (3)
1. mix a PDLC film for nano conducting powders, it is characterized in that: PDLC film is prepared from through mixing, solidification by the liquid crystal of the TMPTA monomer diluent of the acrylic acid modified polyurethane of 30 ~ 40 mass parts, 10 ~ 20 mass parts, the graphene nano conducting particles of 4 ~ 6 mass parts, the defoamer of 2 ~ 3 mass parts and 40 ~ 50 mass parts.
2. the PDLC film mixing nano conducting powders according to claim 1, is characterized in that: described defoamer is silicone defoaming agent.
3. the preparation method mixing the PDLC film of nano conducting powders according to claim 1, is characterized in that, comprise the steps:
(1) acrylic acid modified polyurethane, TMPTA monomer diluent, graphene nano conducting particles and defoamer are mixed obtain polymeric matrix, in polymeric matrix, add liquid crystal and stir 60 ~ 120 minutes with the rotating speed of 100 ~ 300r/min under normal temperature state, obtaining PDLC pre-polymerization slurry;
(2) adopting painting to scrape technique is coated in the release liners of surfacing by PDLC pre-polymerization slurry, coating thickness is 1 ~ 20mm, with after through energy be 150 ~ 300keV within electron beam radiation cured 0.1 ~ 0.3 second, make PDLC pre-polymerization slurry curing film forming, film is peeled off from release liners, obtains PDLC film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510145700.4A CN104698668B (en) | 2015-03-30 | 2015-03-30 | A kind of PDLC film and preparation method thereof for mixing nano conducting powders |
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| CN201510145700.4A CN104698668B (en) | 2015-03-30 | 2015-03-30 | A kind of PDLC film and preparation method thereof for mixing nano conducting powders |
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| CN104698668A true CN104698668A (en) | 2015-06-10 |
| CN104698668B CN104698668B (en) | 2019-04-02 |
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| CN201510145700.4A Expired - Fee Related CN104698668B (en) | 2015-03-30 | 2015-03-30 | A kind of PDLC film and preparation method thereof for mixing nano conducting powders |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242440A (en) * | 2015-11-09 | 2016-01-13 | 深圳市华星光电技术有限公司 | PDLC film preparing method |
| CN105242437A (en) * | 2015-11-09 | 2016-01-13 | 深圳市华星光电技术有限公司 | PDLC display device manufacturing method and PDLC display device |
| CN109324433A (en) * | 2017-08-01 | 2019-02-12 | 北京大学 | A kind of polymer dispersed liquid-crystal film and preparation method thereof of dopen Nano particle |
| CN112631007A (en) * | 2020-12-18 | 2021-04-09 | 天津宝兴威科技股份有限公司 | Preparation method of liquid crystal light adjusting film |
| CN113004784A (en) * | 2021-03-29 | 2021-06-22 | 东莞市鹏威能源科技有限公司 | Graphene LCP composite material, preparation method and application thereof |
| WO2022033599A1 (en) * | 2020-08-11 | 2022-02-17 | 五邑大学 | Polymer-dispersed liquid crystal, preparation method therefor and use thereof |
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| CN102901047A (en) * | 2012-10-13 | 2013-01-30 | 江苏和成显示科技股份有限公司 | Photodiffusion film, backlight module and liquid crystal display with photodiffusion film |
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| WO2022033599A1 (en) * | 2020-08-11 | 2022-02-17 | 五邑大学 | Polymer-dispersed liquid crystal, preparation method therefor and use thereof |
| CN112631007A (en) * | 2020-12-18 | 2021-04-09 | 天津宝兴威科技股份有限公司 | Preparation method of liquid crystal light adjusting film |
| CN113004784A (en) * | 2021-03-29 | 2021-06-22 | 东莞市鹏威能源科技有限公司 | Graphene LCP composite material, preparation method and application thereof |
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| CN104698668B (en) | 2019-04-02 |
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