CN105316003A - Flexibility solar heat preservation liquid-crystal-polymer thin film and preparing method thereof - Google Patents
Flexibility solar heat preservation liquid-crystal-polymer thin film and preparing method thereof Download PDFInfo
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- CN105316003A CN105316003A CN201510805839.7A CN201510805839A CN105316003A CN 105316003 A CN105316003 A CN 105316003A CN 201510805839 A CN201510805839 A CN 201510805839A CN 105316003 A CN105316003 A CN 105316003A
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Abstract
The invention discloses a flexibility solar heat preservation liquid-crystal-polymer thin film and a preparing method thereof. The thin film is prepared from 58.5% to 78.5% of liquid crystals, 1% to 3% of azo dye and 19.5% to 39.5% of polymers. The preparing method of the flexibility solar heat preservation liquid-crystal-polymer thin film includes the following steps that 1, the liquid crystals, the azo dye and polymer prepolymers are adequately and evenly mixed in a darkroom or under red light; 2, the mixture forms a liquid film with the thickness of 10 microns to 500 microns in a coating mode; 3, irradiating is carried out with ultraviolet light for 0.5 minute to 30 minutes, a polymerization reaction is triggered, the liquid crystals and the azo dye form micro-droplets distributed in the polymers, and the flexibility solar heat preservation liquid-crystal-polymer thin film is prepared. According to the prepared flexibility solar heat preservation liquid-crystal-polymer thin film, objects and air covered with the thin film can be heated under the irradiating of high-energy light of sunlight; when sunlight does not exist at night, infrared rays emitted by the objects covered with the thin film are reflected, energy losses are reduced accordingly, and the better heat preservation effect is achieved.
Description
Technical field
The present invention relates to a kind of flexible solar insulation liquid crystal polymer film and preparation method thereof, belong to solar utilization technique.
Background technology
The epoch of technology fast development now, increasing to the consumption of the energy, therefore more and more higher to the requirement of energy-conserving and environment-protective.Sun power is subject to extensive concern as reproducible clean energy.
A kind of mode of sun power is utilized to be the greenhouse plastic greenhouse of agriculture field at present, utilize sunlight intensification booth daytime, keep the temperature of plastic greenhouse by reducing convection current, but common plastics film cannot intercept the ir radiation of object in canopy at night, causes larger calorific loss.
The another kind of mode utilizing sun power is solar water heater, be heat energy by light energy conversion, save among the fluent meterials such as the larger water of specific heat, then be used, although utilize lagging material and vacuum etc. to reduce convection current and the conduction loss of heat, but to night, heat, by the ir radiation of thermal-collecting tube, still has larger calorific loss.
The Land use systems of this kind of sun power, due to the ir radiation of object, also exists larger calorific loss problem at night.
PDLC is the thin-film material of current a kind of common change optical reflectivity, by whether applying electric field in PDLC film both sides, what change the liquid crystal molecule in film in liquid crystal droplet is arranged with sequence, reach the object of control PDLC Film Optics reflectivity, there is manufacturing process complexity in this mode, cost is high, the light reflectance changing film needs control device, and application cost is high, control process exists the problems such as power consumption.
Under the effect of ambient light, can there is the behavior of molecule isomery in azo compound, namely under the irradiation of the high energy light such as UV-light, azo molecules meeting isomery is to high energy structure state, and certain form occurs molecular conformation; After high energy light disappears, by infrared light or hot relaxation, azo molecules can be returned to low-energy configuration state, and molecular conformation reverts to original form.
Summary of the invention
The object of the invention is to consider the problems referred to above and provide a kind of night can reflected infrared flexible solar insulation liquid crystal polymer film.
Another object of the present invention is to provide the making method of flexible solar insulation liquid crystal polymer film a kind of simple to operate, convenient and practical.
Technical scheme of the present invention is: flexible solar insulation film made of the present invention, includes following component: liquid crystal accounting 58.5% ~ 78.5%, azoic dyestuff accounting 1% ~ 3%, polymkeric substance accounting 19.5% ~ 39.5%.
The making method of flexible solar insulation film made of the present invention, comprises the steps:
1) liquid crystal, azoic dyestuff, polymkeric substance performed polymer are fully mixed in darkroom or under ruddiness;
2) liquid film that thickness is 10-500um is coated into;
3) with UV-irradiation 0.5-30 minute, initiated polymerization, makes liquid crystal and azoic dyestuff form droplet distribution in the polymer, obtained flexible solar insulation liquid crystal polymer film.
The present invention is directed to the calorific loss problem that ir radiation causes, the flexible solar insulation liquid crystal polymer film daytime using azobenzene liquid crystal polymer to prepare can transmission sunlight, realizes the intensification to plastic film covering object; Night can be reflected the ir radiation of covered object, ir radiation outwards can not be scattered and disappeared, thus realize better heat insulation effect.Flexible solar insulation liquid crystal polymer film of the present invention utilizes the high energy light in sunlight to carry out the transmittance and reflectance of switching film, self is without consumed energy, also the operating device added is not needed, convenient use on a large scale and promote, being particularly suitable for the application such as the plastic, thermal-insulation booth of agriculture production and solar water heater.
Available liquid crystal polymeric film is by liquid crystal with the fractions distribution of fine droplet in the polymer, utilizes the anisotropic feature of the optical index of liquid crystal material, realizes the transparent and opaque application of film when current field condition is different.Common liquid crystals polymeric film, the orientation of liquid crystal applies extra electric field by transparency electrode and controls, namely by being applied to the transparent rate of the voltage control film of electrode.
Azo-compound is a kind of material that the same molecular formula of intramolecule structural changes can occur under the irradiation of high energy light, and when high energy light does not exist, its interior molecules can return original state by relaxation.
Use flexible solar insulation film made prepared by azo, liquid crystal and polymkeric substance, under the irradiation of sunlight high energy light composition, realize the photo-isomerisable to azo molecules, liquid crystal molecule in induced polymer film in liquid crystal droplet produces order, azobenzene liquid crystal polymer film presents vitreous state for the sunlight of incidence, thus object under plastic film covering of heating and air; Night without sunlight time, azo molecules recovers original state, and the liquid crystal molecule in liquid crystal droplet loses order, azobenzene liquid crystal polymer film presents opaque state, the infrared rays distributed for object under plastic film covering reflects, thus reduces power loss, reaches better heat insulation effect.
Flexible solar insulation (liquid crystal) film that the present invention proposes irradiates azo material by the ultraviolet component in sunlight, the molecule isomery causing azo material realizes the tropism control of liquid crystal, therefore without the need to additional control device, automatically complete transparent and opaque conversion, greatly facilitate application implementation.
Accompanying drawing explanation
Figure 1 shows that common liquid crystals structured polymer film schematic diagram, 1 is isotropic transparent polymer, and 2 are in the liquid crystal droplet of lack of alignment for liquid crystal molecule, and 3 is the liquid crystal droplet of liquid crystal molecule ordered arrangement under electric field action, 4 is the liquid crystal molecule in liquid crystal droplet, and 5 is transparency conductive electrode.
Figure 2 shows that azobenzene liquid crystal polymer membrane structure schematic diagram of the present invention, 1 is isotropic transparent polymer, 6 is the liquid crystal droplet of liquid crystal molecule lack of alignment under low-energy state azo molecules, 7 is the liquid crystal droplet that the lower ordered liquid crystal molecule of high-energy state azo molecule induction arranges, 8 is the liquid crystal molecule in azo liquid crystal droplet, 9 is the azo molecule of low-energy state, and 10 is the azo molecule of high-energy state.
Figure 3 shows that azo compound photo-isomerisable schematic diagram in the present invention, 11 is the low-energy state of azo molecule, and 12 is the high-energy state of azo molecule, when azo molecules receives the irradiation of high energy light, light absorbing energy, molecular conformation changes, and isomery becomes high-energy state; When high energy light no longer irradiates, the azo molecule of high level form is replied as low-energy state under infrared low energy rayed or by the mode of hot relaxation.
Embodiment
Embodiment 1:
By following component: liquid crystal E7 accounting 68.5%, methyl red azoic dyestuff accounting 2%, polymkeric substance performed polymer (carrying light trigger) accounting 29.5%, stir at ruddiness or dark place; Be coated into the liquid film of thickness 50um; Use ultra violet lamp 10 minutes, complete the polyreaction of polymkeric substance, make flexible solar insulation liquid crystal polymer film.
Embodiment 2:
By following component: liquid crystal E7 accounting 74.5%, p-dimethylamino-azo-benzene azoic dyestuff accounting 1%, polymkeric substance performed polymer (carrying light trigger) accounting 24.5%, stir at ruddiness or dark place; Be coated into the liquid film of thickness 30um; Use ultra violet lamp 20 minutes, complete the polyreaction of polymkeric substance, make flexible solar insulation liquid crystal polymer film.
Embodiment 3:
By following component: liquid crystal E9 accounting 64%, methyl red azoic dyestuff accounting 1%, polymkeric substance performed polymer (carrying light trigger) accounting 35%, stir at ruddiness or dark place; Be coated into the liquid film of thickness 30um; Use ultra violet lamp 3 minutes, complete the polyreaction of polymkeric substance, make flexible solar insulation liquid crystal polymer film.
The flexible solar insulation film made that above embodiment is formed, replace common plastics film, by day through sunlight, night is opaque, and the ir radiation of the object covered is unlikely to be scattered and disappeared, thus more effectively utilizes sun power.
Above-described embodiment is used for explaining and the present invention is described, instead of limits the invention, and in the protection domain of spirit of the present invention and claim, any amendment make the present invention and change, all fall into protection scope of the present invention.
Claims (2)
1. a flexible solar insulation liquid crystal polymer film, is characterized in that including following component: liquid crystal accounting 58.5% ~ 78.5%, azoic dyestuff accounting 1% ~ 3%, polymkeric substance accounting 19.5% ~ 39.5%.
2. the making method of flexible solar insulation liquid crystal polymer film according to claim 1, is characterized in that comprising the steps:
1) liquid crystal, azoic dyestuff, polymkeric substance performed polymer are fully mixed in darkroom or under ruddiness;
2) liquid film that thickness is 10-500um is coated into;
3) with UV-irradiation 0.5-30 minute, initiated polymerization, makes liquid crystal and azoic dyestuff form droplet distribution in the polymer, obtained flexible solar insulation liquid crystal polymer film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510805839.7A CN105316003A (en) | 2015-11-20 | 2015-11-20 | Flexibility solar heat preservation liquid-crystal-polymer thin film and preparing method thereof |
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| CN201510805839.7A CN105316003A (en) | 2015-11-20 | 2015-11-20 | Flexibility solar heat preservation liquid-crystal-polymer thin film and preparing method thereof |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0434366A2 (en) * | 1989-12-22 | 1991-06-26 | Matsushita Electric Industrial Co., Ltd. | Polymer dispersed liquid crystal display |
| CN1276773A (en) * | 1997-10-15 | 2000-12-13 | Basf公司 | Thermal insulating coating |
| US6319424B1 (en) * | 1998-10-28 | 2001-11-20 | Korea Research Institute Of Chemical Technology | Polymer/liquid dispersion, composite film and method for producing same |
| EP1763702B1 (en) * | 2004-07-02 | 2007-12-12 | Hewlett-Packard Development Company, L.P. | Liquid crystal display device |
| US20100279125A1 (en) * | 2009-04-29 | 2010-11-04 | Kent State University | Film comprising substrate-free polymer dispersed liquid crystal; fiber, fabric, and device thereof; and methods thereof |
| WO2011068365A2 (en) * | 2009-12-03 | 2011-06-09 | Q-Sys Co., Ltd. | The method of a pdlc type light control body used light with long wavelength, the pdlc type light control body |
| CN202383391U (en) * | 2011-09-07 | 2012-08-15 | 3M创新有限公司 | Dimming insulation film |
| CN102898758A (en) * | 2012-08-21 | 2013-01-30 | 四川大学 | Polymer dispersed liquid crystal film and preparation method thereof |
| CN103885233A (en) * | 2012-12-21 | 2014-06-25 | 北京众智同辉科技有限公司 | Method for preparing color polymer dispersed liquid crystal films |
-
2015
- 2015-11-20 CN CN201510805839.7A patent/CN105316003A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0434366A2 (en) * | 1989-12-22 | 1991-06-26 | Matsushita Electric Industrial Co., Ltd. | Polymer dispersed liquid crystal display |
| CN1276773A (en) * | 1997-10-15 | 2000-12-13 | Basf公司 | Thermal insulating coating |
| US6319424B1 (en) * | 1998-10-28 | 2001-11-20 | Korea Research Institute Of Chemical Technology | Polymer/liquid dispersion, composite film and method for producing same |
| EP1763702B1 (en) * | 2004-07-02 | 2007-12-12 | Hewlett-Packard Development Company, L.P. | Liquid crystal display device |
| US20100279125A1 (en) * | 2009-04-29 | 2010-11-04 | Kent State University | Film comprising substrate-free polymer dispersed liquid crystal; fiber, fabric, and device thereof; and methods thereof |
| WO2011068365A2 (en) * | 2009-12-03 | 2011-06-09 | Q-Sys Co., Ltd. | The method of a pdlc type light control body used light with long wavelength, the pdlc type light control body |
| CN202383391U (en) * | 2011-09-07 | 2012-08-15 | 3M创新有限公司 | Dimming insulation film |
| CN102898758A (en) * | 2012-08-21 | 2013-01-30 | 四川大学 | Polymer dispersed liquid crystal film and preparation method thereof |
| CN103885233A (en) * | 2012-12-21 | 2014-06-25 | 北京众智同辉科技有限公司 | Method for preparing color polymer dispersed liquid crystal films |
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Application publication date: 20160210 |