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Electrophoretic coating liquid and electrophoretic display layer and preparation methods thereof

A coating liquid and electrophoresis technology, applied in electrophoretic coatings, coatings, protein coatings, etc., can solve problems such as poor mechanical properties, damage, and poor leveling, achieve good mechanical properties and leveling, and reduce surface tension. , the effect of improving mechanical properties

Active Publication Date: 2014-06-04
GUANGZHOU OED TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in the electrophoretic coating solution prepared at present.
For example, due to the lack of reasonable selection of adhesives and microcapsules, it is difficult to achieve a balance between mechanical properties, coating properties, and photoelectric properties. , it is difficult to spread when coating, the appearance of the coating film is poor, and the electrophoretic display layer is easy to separate from the conductive layer; the shrinkage force is often insufficient during the drying process of the coating solution, which makes the capsules not easy to deform, the gaps between the capsules are large, and the microcapsules are obtained If it is not protected, it will be damaged, which will eventually cause problems such as poor photoelectric performance of the electrophoretic display layer.
[0004] The Chinese patent application whose publication number is CN102093785A and whose publication date is June 15, 2011 discloses an electrophoretic coating solution and its preparation method. The electrophoretic coating solution provided uses a water-soluble polymer compound solution as an adhesive , although this adhesive can reduce the agglomeration between microcapsules, it also has insufficient mechanical strength of the electrophoretic display layer, which may cause the risk of detachment from the conductive layer.

Method used

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  • Electrophoretic coating liquid and electrophoretic display layer and preparation methods thereof
  • Electrophoretic coating liquid and electrophoretic display layer and preparation methods thereof
  • Electrophoretic coating liquid and electrophoretic display layer and preparation methods thereof

Examples

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Comparison scheme
Effect test

preparation example Construction

[0036] Two preparation methods of microcapsules for reference are provided below.

[0037] Reference method 1:

[0038] Step 1: Prepare 20ml of gelatin (natural water-soluble polymer compound A) solution with a mass fraction of 2% and 20ml of gum arabic (natural water-soluble polymer compound B) solution with a mass fraction of 2%;

[0039] Step 2: Add 5mg of disperse blue BF dye and 5mg of polybutene succinamide PIBI to 5ml of tetrachlorethylene, disperse under ultrasonic at around 50°C for 60min; add 20ml of the prepared gum arabic solution under stirring at 700rpm , continue to stir for 3 minutes; then adjust the speed to 300rpm, add 20ml of gelatin solution that has been prepared; then adjust the pH to about 4 with 10% acetic acid solution, slowly cool down to below 10°C, add 5ml of acetic acid solution with a mass fraction of 5 % glutaraldehyde solution, stirred for 1 h.

[0040] Step 3: introduce the microcapsules prepared in step 2 into a vibrating sieve, and wash the...

Embodiment 1

[0047] Embodiment 1 (this example is the preparation example of electrophoretic coating solution)

[0048] Prepare electrophoretic coating liquid, adopt following steps to prepare:

[0049] (1) Prepare microcapsules according to the microcapsule preparation method of reference method 2 mentioned above, wherein the natural water-soluble polymer compounds A and B are gelatin and gum arabic respectively;

[0050] (2) Weigh 100 g of the microcapsules prepared in step (1) with a centrifuged solid content of 45%, and set aside;

[0051] (3) Dissolve 0.6g of gelatin (component A) in 2.4g of water, filter to obtain a gelatin solution, mix it with the microcapsules in step (2), stir at 250rpm for 1.0h, and mix well to get a preliminary Electrophoretic coating solution;

[0052] (4) Weigh 20 g of aqueous polyurethane solution (component B) into the preliminary electrophoretic coating solution prepared in step (3), and stir for 1.0 h to obtain the electrophoretic coating solution.

[...

Embodiment 26

[0058] Embodiment 26 (this example is the preparation example of electrophoretic display layer, see figure 1 )

[0059] The electrophoretic display layer is prepared by the following steps:

[0060] The prepared electrophoretic coating solution is coated on the ITO (indium tin oxide) transparent conductive layer 3 of the PET film 1 by using a coater, dried and cured to form the electrophoretic display layer 5 . A substrate 2 with several pixel electrodes is covered on the electrophoretic display layer 5, and the pixel electrodes on the substrate 2 and the electrophoretic display layer 5 are thermally pressed or glued together with transparent glue. In this embodiment, transparent glue is used to bond the pixel electrodes on the substrate 2 and the electrophoretic display layer 5 together, and a glue layer 4 is formed between the substrate 2 and the electrophoretic display layer 5 .

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Abstract

The invention provides an electrophoretic coating liquid and a preparation method thereof, the electrophoretic coating liquid includes an adhesive and a microcapsule dispersing in the adhesive, the microcapsule comprises a suspension and charged pigment particles dispersing in the suspension, the outer capsule wall of the microcapsule is prepared by use of a natural water-soluble polymer compound, and the adhesive comprises the water-soluble polymer compound and aqueous polyurethane. The invention also provides an electrophoretic display layer and a preparation method thereof, and the electrophoretic display layer is prepared by use of the electrophoretic coating liquid. The electrophoretic coating liquid achieves a good balance in mechanical properties, coating film properties, photoelectric properties and other aspects, and has the characteristic of being easy to coat a film, excellent in coating film appearance and the like, and the electrophoretic display layer prepared by use of the electrophoretic coating liquid has high mechanical performances and good photoelectric performances.

Description

technical field [0001] The invention relates to the technical field of electrophoretic display, in particular to an electrophoretic coating liquid and its preparation and application. Background technique [0002] Electrophoretic image display (EPID, that is, electrophoretic image display) is a phenomenon that uses colloidal dispersed particles to swim under the action of an electric field. Its advantages are high contrast, large viewing angle, high display brightness, low price, and easy realization of large flat display, etc. . Its disadvantages are poor reliability, and the threshold characteristics are not easy to control, especially the particles in the dispersion system are prone to agglomeration and precipitation, so the life of EPID display is relatively short. Japanese Patent JP2551783 discloses an electrophoretic display device, which proposes the concept of electronic ink (encapsulated electrophoretic ink), that is, microencapsulated electrophoretic display techn...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D101/26C09D103/02C09D103/18C09D193/00C09D189/00C09D105/00C09D129/04C09D171/08C09D133/26C09D139/06C09D5/44G02F1/167
Inventor 魏松丽罗裕杰张磊黄伟杰林秋慧
Owner GUANGZHOU OED TECH INC
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