A liquid crystal composition and a handwriting film with variable handwriting based on it

A technology of liquid crystal composition and liquid crystal molecules, which is applied in the field of handwriting film, and can solve problems such as rising costs, low production yield, and poor adhesion

Active Publication Date: 2020-11-13
ZHUHAI SINGYES NEW MATERIALS TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, in order to achieve a bright state, the current handwriting film on the market has a very high content of cholesteric liquid crystal molecules, generally as high as 75-90%. It is relatively low, and the subsequent processing is difficult, and the overall cost has increased significantly, which limits its wide application

Method used

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  • A liquid crystal composition and a handwriting film with variable handwriting based on it
  • A liquid crystal composition and a handwriting film with variable handwriting based on it
  • A liquid crystal composition and a handwriting film with variable handwriting based on it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method of handwriting variable handwriting film comprises the following steps:

[0043] Step 1: Select a transparent frosted conductive film with a thickness of 125 μm, with a square resistance of 500Ω, a haze of 25%, and a transmittance of 89%. Among them, the type of transparent frosted conductive film can be selected according to actual needs, and can be made of PET transparent Composite base film and conductive layer;

[0044] Step 2: Select an opaque black conductive film with a thickness of 188 μm and a square resistance of 500Ω; the type of opaque black conductive film can be selected according to actual needs, and can be composed of PET opaque black base film and conductive layer;

[0045] Step 3: Prepare liquid crystal composition

[0046] 1. Preparation of cholesteric liquid crystal molecules: select high birefringence nematic liquid crystal with Δn of 0.25, according to high birefringence nematic liquid crystal: R811 chiral agent: R6N chiral ...

Embodiment 2

[0052] The preparation method of handwriting variable handwriting film comprises the following steps:

[0053] Step one to step two are the same as embodiment 1;

[0054] Step 3: Prepare liquid crystal composition

[0055] 1. Preparation of cholesteric liquid crystal molecules: select high birefringence nematic liquid crystal with Δn of 0.27, according to high birefringence nematic liquid crystal: S2011 chiral agent: S5011 chiral agent = 91:7:2 The proportion of the preparation of cholesteric liquid crystal molecules;

[0056] 2. Preparation of ultraviolet curable optical glue: Add 45% of polydipentaerythritol hexaacrylate, 27% of pentaerythritol triacrylate, 25% of (iso)decyl (meth)acrylate, 2% of specific resin and 1-Hydroxycyclohexyl phenyl ketone 1%;

[0057] 3. Add the above prepared cholesteric liquid crystal molecules and ultraviolet curable optical glue in a ratio of 65:35. The microbeads have a particle size of 5 μm, and the ratio is the total amount of cholesteric...

Embodiment 3

[0061] Step one to step two are the same as embodiment 1;

[0062] Step 3: Prepare liquid crystal composition

[0063] 1. Preparation of cholesteric liquid crystal molecules: select high birefringence nematic liquid crystal with Δn of 0.25, according to high birefringence nematic liquid crystal: S811 chiral agent: S5011 chiral agent = 94:5:1 The proportion of the preparation of cholesteric liquid crystal molecules;

[0064] 2. Preparation of UV-curable optical glue: Add 51.5% of poly-dipentaerythritol hexaacrylate, 20% of modified trimethylolpropane tri(meth)acrylate, and 21% of hydroxyethyl methacrylate according to the following component ratios , specific resin 7% and 2-hydroxy-2-methyl-1-phenyl-1-propanone 0.5%;

[0065] 3. Add the above prepared cholesteric liquid crystal molecules and ultraviolet curable optical glue in a ratio of 60:40. The microbeads have a particle size of 5 μm, and the ratio is the total amount of cholesteric liquid crystal molecules and ultraviole...

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Abstract

The invention relates to a liquid crystal composition. The composition is prepared from cholesteric liquid crystal molecules, an ultraviolet hardened optical adhesive and microspheres, wherein the dosage ratio of the cholesteric liquid crystal molecules to the ultraviolet hardened optical adhesive is (55-70):(30-45), and the microspheres are 3-6%o of the total weight of the cholesteric liquid crystal molecules and the ultraviolet hardened optical adhesive. The cholesteric liquid crystal molecules are prepared from, by mass, 90-95% of high birefringence nematic liquid crystals, 4-7% of a low HTP value chiral reagent and 1-3% of a high HTP value chiral reagent; the ultraviolet hardened optical adhesive is prepared from, by mass, 40-60% of a hexafunctional denatured acrylic monomer, 18-30% ofa trifunctional acrylic monomer, 20-25% of a mono-functional acrylic monomer, 1-8% of specific resin and 0.5-1% of a photoinitiator combination. According to the liquid crystal composition, a handwriting film can be variable in handwriting, good in adhesion, high in contrast and relatively low in cost. The invention further provides the handwriting-variable handwriting film prepared through the liquid crystal composition.

Description

technical field [0001] The invention relates to the technical field of handwriting film, in particular to a liquid crystal composition and a handwriting film with variable handwriting based on it. Background technique [0002] The handwriting film is two substrates with a conductive layer filled with mixed monomers or prepolymers, liquid crystals and related liquid crystal compositions (chiral dopants\ optical active agent), the liquid crystal composition is mainly used to adjust the helical pitch of the cholesteric liquid crystal to achieve the effect of adjusting its Bragg reflection, specifically, the difference in visible light reflectance of the liquid crystal in different stable states is used to display handwriting. [0003] After the handwriting film is connected to the refresh circuit for refreshing, the cholesteric liquid crystal is in the steady state FC state, and when pressure is applied to the handwriting film, the cholesteric liquid crystal will flip to the st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/52C09K19/58G02F1/137G02F1/1334
CPCC09K19/52C09K19/586G02F1/1334G02F1/13718G02F1/13345
Inventor 吴琴李唯孙金礼汤立文
Owner ZHUHAI SINGYES NEW MATERIALS TECH CO LTD
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