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A special liquid crystal composition for handwriting board and flexible handwriting film based on it

A technology of liquid crystal composition and handwriting tablet, which is applied in liquid crystal materials, nonlinear optics, instruments, etc., can solve the problems of inability to realize flexible display and large size, affect the degree of freedom of liquid crystal molecules, and general erasing sensitivity, and achieve yellowing resistance Excellent variable effect, low square resistance, good fluidity

Active Publication Date: 2020-11-13
合肥微晶材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the liquid crystal handwriting boards on the market are all prepared based on ITO conductive film. When used on large-size writing boards, the flexibility is poor and the erasing sensitivity is average, which is not conducive to the production and preparation of large-scale
[0004] Patent CN107236551 proposes a liquid crystal composition and a liquid crystal handwriting film prepared therefrom. A large amount of UV monomer is used in the liquid crystal composition. Although the UV monomer has a longer carbon chain, it still has a certain rigidity after curing. Unable to achieve high flexibility, affecting the degree of freedom of liquid crystal molecules, thereby reducing display brightness
At the same time, ITO is brittle and has high square resistance, which cannot realize flexible display and large size

Method used

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  • A special liquid crystal composition for handwriting board and flexible handwriting film based on it
  • A special liquid crystal composition for handwriting board and flexible handwriting film based on it
  • A special liquid crystal composition for handwriting board and flexible handwriting film based on it

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of liquid crystal composition: Add 30g of hyperbranched resin HP6919 and 7g of UV monomer trimethylolpropane formal acrylate into the dispersion tank, stir for 30min with a tetrafluoroethylene stirring rod at 1000r / min; then adjust the stirring speed to 500r / min min, gradually add 53.7g nematic liquid crystal C70 / 02CN, continue stirring for 30min; finally add 8g chiral dopant R1011, 0.9g photoinitiator Irgacure127 and 0.4g light stabilizer Tinuvin5151, and continue stirring for 30min to obtain liquid crystal composition;

[0030] (2) The liquid crystal composition prepared by step (1) is uniformly coated in the middle of two layers of nano-silver wire transparent conductive films, and is cured by UV (500mJ / cm 2 , 3s), and rolled to prepare a flexible handwriting film.

Embodiment 2

[0032] (1) Preparation of liquid crystal composition: Add 40 g of hyperbranched resin HP6919 and 7 g of UV monomer trimethylolpropane formal acrylate into the dispersion tank, and stir for 30 min with a tetrafluoroethylene stirring rod at 1000 r / min. Then adjust the stirring speed to be 500r / min, gradually add 43.4g nematic liquid crystal C70 / 02CN, continue to stir for 30min, and finally add 8g chiral dopant R1011, 1.2g photoinitiator Irgacure127 and 0.4g light stabilizer Tinuvin5151 successively, Stirring was continued for 30 minutes to obtain a liquid crystal composition;

[0033] (2) The liquid crystal composition prepared by step (1) is uniformly coated in the middle of two layers of nano-silver wire transparent conductive films, and is cured by UV (500mJ / cm 2 , 3s), and rolled to prepare a flexible handwriting film.

Embodiment 3

[0035] (1) Preparation of liquid crystal composition: Add 50g of hyperbranched resin HP6919 and 7g of UV monomer trimethylolpropane formal acrylate into the dispersion tank, stir with a tetrafluoroethylene stirring rod at 1000r / min for 30min; then adjust the stirring speed to 500r / min min, gradually add 33.1g nematic liquid crystal C70 / 02CN, continue to stir for 30min, finally add 8g chiral dopant R1011, 1.5g photoinitiator Irgacure127 and 0.4g light stabilizer Tinuvin5151, and continue stirring for 30min to obtain liquid crystal composition;

[0036] (2) The liquid crystal composition prepared by step (1) is uniformly coated in the middle of two layers of nano-silver wire transparent conductive films, and is cured by UV (500mJ / cm 2 , 3s), and rolled to prepare a flexible handwriting film.

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Abstract

The invention discloses a special liquid crystal composition for a writing pad and a flexible writing film based on the special liquid crystal composition. The special liquid crystal composition is characterized in that a nematic-phase liquid crystal, a chiral doping agent, hyperbranched resin, a photoinitiator, a light stabilizer and a UV (Ultraviolet) monomer are uniformly mixed to prepare the liquid crystal composition; the liquid crystal composition is uniformly coated between two layers of nano-silver wire transparent conductive membranes and is subjected to UV curing to prepare the flexible writing film. According to the flexible writing film prepared by the invention, the hyperbranched resin is utilized so that the writing film has high brightness, rapid response and excellent flexibility; the photoinitiator with excellent yellowing-resisting performance and the light stabilizer are utilized and the durability of the writing film is improved; the nano-silver wire transparent conductive membranes with low square resistance are utilized so that the liquid crystal composition is more suitable for preparing large-size flexible writing films; furthermore, the flexible writing film is simple in structure and industrialized production is easy to realize.

Description

technical field [0001] The invention relates to the field of liquid crystal display, in particular to the technical field of handwriting boards, and more specifically to a special liquid crystal composition for handwriting boards and a flexible handwriting film based thereon. Background technique [0002] With the development of the times and social progress, the demand for LCD handwriting boards in education, teaching, conferences, painting, design, etc. is increasing. For example, using LCD handwriting boards to replace traditional blackboards can solve the problem of chalk dust, and at the same time it can achieve paperless Teaching, and it requires no energy to maintain the display content, and the energy consumption is extremely low. Due to the increasing demand for handwriting boards and the expansion of application scope, the requirements for handwriting boards are also gradually increasing. For example, when they are used in conferences or classrooms, the space is la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/54G02F1/1333
CPCC09K19/54C09K19/542C09K2019/546G02F1/13338
Inventor 吕鹏张梓晗杨锦张运奇聂彪
Owner 合肥微晶材料科技有限公司