Liquid crystal membrane capable of being repeatedly processed and manufacturing method thereof

A technology of repeated processing and manufacturing methods, applied in optics, instruments, nonlinear optics, etc., can solve the problems of liquid crystal particles of different sizes, light-adjustable liquid crystal films that cannot be repeatedly bonded/processed, and light leakage, etc., to achieve good adhesion /Effect of processability, repeatability/processability

Inactive Publication Date: 2010-08-04
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It is known that the liquid crystal film used in electrically adjustable glass is a polymer dispersed liquid crystal film (Polymer dispersed liquid crystal film; PDLC film), which will leak light when it is twisted or pressed, so it is not suitable for use on curved surfaces (such as car window glass), the reason may be that liquid crystal particles of different sizes are produced when the monomer is polymerized to discharge the liquid crystal
In addition, known dimming liquid crystal films cannot be laminated / processed repeatedly, and cannot be produced by a roll-to-roll continuous production process (Roll-to-Roll process)

Method used

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  • Liquid crystal membrane capable of being repeatedly processed and manufacturing method thereof
  • Liquid crystal membrane capable of being repeatedly processed and manufacturing method thereof
  • Liquid crystal membrane capable of being repeatedly processed and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The microencapsulated liquid crystal particles of the synthesis example and 20% polyvinyl alcohol aqueous solution are uniformly mixed according to the ratio of 1:1.5 (weight ratio) at room temperature, and the liquid crystal coating can be prepared. The viscosity of the coating is 1000-1100cps (25°C), The solids content is about 42%. The weight average molecular weight of the polyvinyl alcohol used above is 27000-32000, the degree of polymerization is 550-650, and the sodium ion content is lower than 60ppm.

[0041] by figure 2 In the device shown, the PET-ITO film is coated with liquid crystal coating through the slit coating head (the coating width is 1.1 meters), and then enters the five-stage oven (temperature 40-90 ° C) to dry at a line speed of about 4 Move at a moving speed of m / min, and finally pass through a hot bonding wheel at about 100°C to bond with another PET-ITO film to continuously generate an electrically adjustable liquid crystal film with a thickn...

Embodiment 2

[0043] Same as Example 1, but wherein the liquid crystal coating is changed into microencapsulated liquid crystal particles and 20% polyvinyl alcohol aqueous solution, 20% polyurethane (PU) aqueous solution according to 1: 1.29: 0.21 (weight ratio) at room temperature uniformly mixed, the viscosity of coating It is 800-900cps (25°C), and the solid content is about 42%.

[0044] 【Optoelectronic Analysis of Electrically Dimmable Liquid Crystal Films】

[0045] The electro-dimmable glass produced by cutting the electro-dimmable liquid crystal film in rolls of Examples 1 and 2 and then going through the glass gluing process has a size of 1.1 meters in width and 3 meters in length. Measure its photoelectric property with clarity instrument (the instrument of EDTM company), its result is as follows Figure 5 As shown, the electrically adjustable liquid crystal film of Example 1 has high light transmittance (T%=65%@45V) which is better than the commercially available product Polyvisi...

Embodiment 3

[0056] With embodiment 1, but wherein use ion content to be lower than 60ppm respectively and ion content is higher than two kinds of 20% polyvinyl alcohol aqueous solutions of 3600ppm to prepare coating, and utilize scraper to coat on PET-ITO film, enter baking oven ( The temperature is 80-90°C) and dried for 7 minutes, and finally bonded with another PET-ITO film by a heat laminating machine at about 100°C to produce an electrically adjustable liquid crystal film with a thickness of 8 μm and 15 μm.

[0057] [Optoelectronic analysis of electrically tunable liquid crystal films made of 20% PVA aqueous solutions with different ion contents]

[0058] Measure the light transmittance of the electric dimmable film sample that uses low ion content (≤60ppm) and high ion content (≥3600ppm) 20% polyvinyl alcohol aqueous solution to make of embodiment 3 to the voltage relation figure, and its result is as follows Figure 10 As shown, the light transmittance of the electric dimmable film...

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Abstract

The invention provides a liquid crystal membrane capable of being repeatedly processed, which comprises a first substrate, a first conductive layer and a liquid crystal layer, wherein the first conductive layer is arranged on the first substrate; the liquid crystal layer is arranged on the first conductive layer; and the liquid crystal layer contains microencapsulated liquid crystal particles dispersed in a thermoplastic macromolecule. The invention also provides a manufacturing method for the liquid crystal membrane.

Description

technical field [0001] The invention relates to a liquid crystal film, and in particular to an electrically adjustable liquid crystal film which can be repeatedly processed. Background technique [0002] Electrically switchable glass (electrically switchable glass), also known as smart glass, is one of the special glasses for architectural decoration. There is a liquid crystal film in the middle. Using the characteristics of liquid crystal, the light transmission can be adjusted by changing the current through electric control. The rate can realize the conversion of glass from transparent to opaque. Electronically controlled dimming glass has been widely used in high-end offices, businesses, hospitals, residences, computer rooms, automobiles, aerospace and other fields, and can also be used as a projector screen. [0003] The dimming principle of electric dimmable glass is: in the natural state (power off without electric field), the arrangement of its internal liquid cryst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1334G02F1/1333
Inventor 金志龙吴家宏刘仕贤郑功龙张义和陈哲阳陈青佑
Owner IND TECH RES INST
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