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Modified spacer powder, preparation method thereof and liquid crystal handwriting board

A modification, liquid crystal layer technology, applied in liquid crystal materials, chemical instruments and methods, nonlinear optics, etc., can solve the problems of handwriting burrs, uneven force of spacer powder, poor smoothness, etc., and achieve good compatibility , the effect of improving smoothness

Active Publication Date: 2020-08-25
SHENZHEN POLICRAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The incompatibility between the spacer powder and the liquid crystal and polymer network in the liquid crystal tablet leads to the uneven force of the spacer powder and the sliding in the liquid crystal layer due to the external writing pressure when writing on the tablet, resulting in uneven edges of the writing , the smoothness is not good, and there are burrs around the handwriting

Method used

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  • Modified spacer powder, preparation method thereof and liquid crystal handwriting board
  • Modified spacer powder, preparation method thereof and liquid crystal handwriting board
  • Modified spacer powder, preparation method thereof and liquid crystal handwriting board

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preparation example Construction

[0028] The present invention also provides a preparation method of the modified spacer powder described in the above technical scheme, comprising the following steps:

[0029] The spacer powder is subjected to corona discharge treatment to obtain a surface-modified spacer powder;

[0030] The surface-modified spacer powder, anhydrous aluminum chloride, photoinitiator and tetrahydrofuran are mixed, grafting reaction is carried out under strict anhydrous and oxygen-free conditions, purification and drying are carried out to obtain the modified spacer powder.

[0031] In the invention, the spacer powder is subjected to corona discharge treatment to obtain the surface-modified spacer powder.

[0032] In the present invention, the voltage of the corona discharge treatment is preferably 2-200kV, more preferably 10-25kV; the frequency is preferably 2-10kHz, more preferably 3-5kHz.

[0033] The present invention uses corona discharge treatment to generate carbonyl, carboxyl and other...

Embodiment 1

[0054] Preparation method of modified spacer powder

[0055] PS microspheres (particle size 2-7μm, specific gravity 1.08g / cm 3 , with a refractive index of 1.59 and a thermal decomposition temperature of 340°C) was subjected to corona discharge treatment under conditions of 2kV and 3kHz to obtain surface-modified polystyrene microspheres;

[0056] Mix 15g of surface-modified polystyrene microspheres, 15g of anhydrous aluminum chloride and 10g of benzoin methyl ether in tetrahydrofuran, perform grafting reaction at room temperature for 135min under strict anhydrous and oxygen-free conditions, purify and dry to obtain modified spacer powder.

[0057] Preparation of liquid crystal tablet:

[0058] The first ITO conductive layer and the second ITO conductive layer with a thickness of 100nm are sequentially attached on the first substrate (made of PET) and the second substrate (made of PET) with a thickness of 50 μm;

[0059] Mix 2 parts by weight of modified spacer powder, 30 pa...

Embodiment 2

[0061] Preparation method of modified spacer powder

[0062] PMMA microspheres (particle size 5-7μm, refractive index 1.49, thermal decomposition temperature 280°C, specific gravity 2.03g / cm 3 ) Corona discharge treatment is carried out conditionally at 2kV, 3kHz to obtain surface-modified PMMA microspheres;

[0063] Mix 15g of surface-modified PMMA microspheres, 15g of anhydrous aluminum chloride and 10g of Irgacure 651 in tetrahydrofuran, perform a strict anhydrous and anaerobic grafting reaction at room temperature for 2.5 hours, obtain modified spacer powder after purification and drying.

[0064] Preparation of liquid crystal tablet:

[0065] The first ITO conductive layer and the second ITO conductive layer with a thickness of 100nm are sequentially attached on the first substrate (made of PET) and the second substrate (made of PET) with a thickness of 100 μm;

[0066] Mix 2 parts by weight of modified spacer powder, 30 parts by weight of polymerized liquid crystalline...

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Abstract

The invention provides modified spacer powder, a preparation method thereof and a liquid crystal handwriting board, and belongs to the technical field of liquid crystal materials. The modified spacerpowder provided by the invention is photoinitiator grafted spacer powder, a photoinitiator is benzoin methyl ether or Irgacure 651, and the spacer powder is polystyrene microspheres or polymethyl methacrylate microspheres; and the photoinitiator is connected with the spacer powder through a covalent bond. The modified spacer powder provided by the invention has good compatibility with liquid crystal in liquid crystal layer feed liquid, and the smoothness of handwriting of the liquid crystal handwriting board is improved. Moreover, the photoinitiator grafted on the modified spacer powder can initiate polymerization of polymeric monomers in the liquid crystal layer feed liquid, and finally, the spacer powder can be inserted into a polymer network, so that the polymer network close to the spacer powder microspheres is dense. The purpose of controlling the density of polymer networks in the liquid crystal handwriting board is achieved by controlling the amount of the photoinitiator graftedon the spacer powder microspheres, and then the handwriting thickness of the handwriting board is controlled.

Description

technical field [0001] The invention relates to the technical field of liquid crystal materials, in particular to a modified spacer powder, a preparation method thereof, and a liquid crystal tablet. Background technique [0002] Existing liquid crystal tablet, the spacer powder that adopts is inorganic material or organic polymer material, and its structure is as follows: figure 1 as shown, figure 1 It is the topography diagram of the microspherical spacer powder used in the existing liquid crystal writing board; it only plays the role of separating the upper and lower substrates of the writing board. Such spacer powder is not compatible with the liquid crystal and polymer network in the liquid crystal tablet, such as figure 2 and image 3 as shown, figure 2 It is a schematic diagram of the structure of the existing liquid crystal tablet (before the monomer is not polymerized), image 3 It is a structural schematic diagram of an existing liquid crystal tablet (after m...

Claims

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Application Information

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IPC IPC(8): C08J7/12C09K19/52G02F1/1333C08L25/06C08L33/12
CPCC08J7/12C08J7/123C08J2325/06C08J2333/12C09K19/52C09K2019/523G02F1/13338
Inventor 夏亮陆红波吴飞沈隆军
Owner SHENZHEN POLICRAL TECH CO LTD
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