A kind of preparation method of infrared shielding film

A technology of infrared shielding and thin film, which is applied in the direction of sustainable manufacturing/processing, climate sustainability, chemical industry, etc., can solve the problems that cannot meet the requirements of the application, improve the light scattering ability, strong light scattering effect, and broaden the selection The effect of sexual reflection wave width

Active Publication Date: 2017-03-15
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the helical pitch of the cholesteric liquid crystal is constant, when the reflection wavelength and bandwidth are adjusted by adjusting the refractive index, since the maximum birefringence of the cholesteric liquid crystal is about 0.3, the reflection spectral bandwidth in the visible light band is usually below 100nm, which cannot be achieved. application requirements

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  • A kind of preparation method of infrared shielding film
  • A kind of preparation method of infrared shielding film
  • A kind of preparation method of infrared shielding film

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of an infrared shielding film, said method comprising the following steps:

[0030] 1) In terms of weight percentage, 50% of the side chain polymer liquid crystal with a nematic phase and a cholesteric phase side group ratio of 17:3 and 50% of ethylene-vinyl acetate copolymer are co-dissolved in methylene chloride , then add glass microspheres with a particle size of 12 μm accounting for 1% of the total mass of the solution system, stir at room temperature for 4 hours to obtain a uniform solution, drop the uniform solution on the glass substrate and volatilize at room temperature for 6 hours, and then cover the upper glass substrate , apply 200g / cm2 in vacuum oven 2 Under the pressure of 120 ℃ for 5 hours, cooled to room temperature to obtain a film;

[0031] 2) In terms of weight percentage, 50% of the side chain polymer liquid crystal with a nematic phase and a cholesteric side group ratio of 4:1 and 50% of ethylene-vinyl acetate copolymer are co...

Embodiment 2

[0039] A preparation method of an infrared shielding film, said method comprising the following steps:

[0040] 1) In terms of weight percentage, 40% of the side chain polymer liquid crystal with a nematic phase and a cholesteric phase side group ratio of 17:3 and 60% of ethylene-vinyl acetate copolymer are co-dissolved in methylene chloride , then add glass microspheres with a particle size of 10 μm accounting for 5% of the total mass of the solution system, stir at room temperature for 3 hours to obtain a uniform solution, drop the uniform solution on the glass substrate and volatilize at room temperature for 6 hours, and then cover the upper glass substrate , apply 300g / cm2 in vacuum oven 2 Under the pressure of 120 ℃ for 4 hours, cooled to room temperature to obtain a film;

[0041]2) In terms of weight percentage, 40% of the side chain polymer liquid crystal with a nematic phase and a cholesteric phase side group ratio of 4:1 and 60% of ethylene-vinyl acetate copolymer a...

Embodiment 3

[0045] A preparation method of an infrared shielding film, said method comprising the following steps:

[0046] 1) In terms of weight percentage, 60% of side chain macromolecular liquid crystals with a nematic phase and a cholesteric phase side group ratio of 17:3 and 40% of ethylene-vinyl acetate copolymer are co-dissolved in methylene chloride , then add glass microspheres with a particle size of 12 μm accounting for 3% of the total mass of the solution system, stir at room temperature for 5 hours to obtain a uniform solution, drop the uniform solution on the glass substrate and volatilize at room temperature for 6 hours, and then cover the upper glass substrate , apply 250g / cm2 in vacuum oven 2 Under the pressure of 120 ℃ for 6 hours, cooled to room temperature to obtain film 1;

[0047] 2) In terms of weight percentage, 60% of the side chain polymer liquid crystal with a nematic phase and a cholesteric phase side group ratio of 4:1, and 40% of ethylene-vinyl acetate copol...

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Abstract

The invention discloses a method for preparing an infrared shielding film. The method comprises the following steps of 1) jointly dissolving 40-60% side-chain polymeric liquid crystals in which the ratios of side groups of a nematic phase to side groups of a cholesteric phase are respectively 4:1, 17:3 and 9:1 and 60-40% ethylene-vinyl acetate copolymer in dichloromethane, respectively adding glass beads which account for 1-5% of the total mass of the solution system, stirring at room temperature for 3-5 hours, preparing a film by virtue of a solvent evaporation method, drying and pulverizing to obtain powder of three different compounds; and 2) evenly mixing powder of three different compounds obtained in step 1), preparing the film by virtue of a coating method and carrying out pressurized heat treatment on the film to obtain the infrared shielding film. By virtue of the infrared shielding film disclosed by the invention, the width of the selective reflection wave is widened to achieve the purpose of saving energy by shielding light in a near-infrared region.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal application, in particular, the invention relates to a preparation method of an infrared shielding film. Background technique [0002] The infrared shielding film can achieve its effect by applying the selective reflection property of the cholesteric liquid crystal. However, the infrared shielding film prepared by the existing method has disadvantages such as complicated process and insufficient selective reflection wave width. When the cholesteric liquid crystal is planarly aligned, its molecules are arranged according to the planar texture. Molecules present a regular spatial periodic arrangement along the direction perpendicular to the substrate. The molecular preferential orientation direction of each layer is defined as the director n (parallel to the substrate direction), because the +n and -n directions are parallel and equivalent, and the molecular arrangement space period length ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08J5/18C08L23/08C08L33/14C08K7/20
CPCY02P20/10
Inventor杨槐高延子张兰英姚雯还李辰悦宋平郭姝萌王萌于美娜
OwnerPEKING UNIV