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Aqueous polyurethane emulsion as well as application thereof on electrophoretic display coating liquid and display device

A water-based polyurethane, electrophoretic display technology, used in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, coatings, etc. The effect of improving tensile strength and cohesion, good adhesion and film strength, and improving volume resistivity

Active Publication Date: 2013-04-24
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 currently prepared electrophoretic display devices.
One of them is that the adhesive used in the electrophoretic coating solution is often weak in viscosity and low in volume resistivity, resulting in poor mechanical properties of the electrophoretic display layer, detachment of the coating film from the conductive layer, insufficient contrast, and poor photoelectric performance.

Method used

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  • Aqueous polyurethane emulsion as well as application thereof on electrophoretic display coating liquid and display device
  • Aqueous polyurethane emulsion as well as application thereof on electrophoretic display coating liquid and display device
  • Aqueous polyurethane emulsion as well as application thereof on electrophoretic display coating liquid and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An aqueous polyurethane emulsion is prepared according to the following preparation steps:

[0038] 1) Weigh the first part of the raw materials, that is, weigh 18 polyester diols, 40 polyether diols (number average molecular weight Mn is 500), 13 polyethylene glycols, and 3 small molecules by weight. The dihydric alcohol chain extender and the diisocyanate of 26 were put into the reaction pot and stirred at 85°C for 4 hours to form the reaction mixture I;

[0039] 2) When the reaction mixture I in step 1) becomes viscous, add the low-boiling solvent acetone of the second part of the raw material, the amount of which is 1-1.2:2 compared with the total weight of the first part of the raw material, and lower the temperature to 50°C, Stir until the reaction mixture I is completely dissolved to form the reaction mixture II; the method for judging that the reaction mixture I becomes viscous is to prepare a 50% DMF (N,N-dimethylformamide) solution of the reaction mixture I, 2...

Embodiment 2

[0043] An aqueous polyurethane emulsion is prepared according to the following preparation steps:

[0044] 1) Weigh the first part of the raw materials, that is, weigh 20 polyester diols, 48 ​​polyether diols (number average molecular weight Mn is 800), 15 polyethylene glycols, and 6 small molecules by weight. Polyamine chain extender and 23 diisocyanate, put them into the reaction pot, and stir at 85 ° C for 5 hours to form reaction mixture I;

[0045] 2) When the reaction mixture I in step 1) becomes viscous, add the second part of the raw material low-boiling solvent butanone in an amount of 1.4:2 compared to the total weight of the first part of the raw material, lower the temperature to 58°C, and stir. Until the reaction mixture I is completely dissolved, the reaction mixture II is formed; the method for judging that the reaction mixture I becomes viscous is to prepare a 50% DMF solution of the reaction mixture I. At 25°C, the measured viscosity is greater than 50,000 mPa...

Embodiment 3

[0049] An aqueous polyurethane emulsion is prepared according to the following preparation steps:

[0050] 1) Weigh the first part of the raw materials, that is, weigh 9 polyester diols, 36 polyether diols (number average molecular weight Mn is 1000), 10 polyethylene glycols, and 2 small molecules by weight. Polyol chain extender and 20% aliphatic diisocyanate, put them into the reaction pot, and stir at 70°C for 2 hours to form reaction mixture I;

[0051] 2) When the reaction mixture I in step 1) becomes viscous, add the low-boiling solvent acetone of the second part of the raw material, the amount of which is 1:2 compared with the total weight of the first part of the raw material, lower the temperature to 45°C, and stir until The reaction mixture I is completely dissolved to form the reaction mixture II; the method for judging that the reaction mixture I becomes viscous is to prepare a 50% DMF solution of the reaction mixture I, and the measured viscosity is greater than 5...

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Abstract

The invention provides an aqueous polyurethane emulsion as well as application thereof on electrophoretic display coating liquid and an electrophoretic display device. The aqueous polyurethane emulsion is prepared from the following three parts of raw materials: a first part of raw materials comprising the following components in parts by weight: 9-20 parts of polyester diol, 36-48 parts of polyether diol, 10-15 parts of polyethylene glycol, 2-6 parts of micromolecular chain extender and 20-26 parts of diisocyanate; a second part of raw material comprising a low-boiling point solvent, wherein the ratio of the dose of the second part of raw material to the total weight of the first part of raw materials is (1-1.4):2; and a third part of raw material being deionized water, wherein the ratio of the dose of the third part of the raw material to the total weight of the first part of raw materials and the second part of raw material is (1-1.3):1.2. The obtained aqueous polyurethane emulsion has the characteristics of being high in viscosity, high in volume resistivity, odourless and environment-friendly and the like. When the obtained aqueous polyurethane emulsion is applicable to the electrophoretic display coating liquid and the electrophoretic display device, an electrophoretic display layer is high in peel strength and the prepared electrophoretic display device is good in photoelectric property.

Description

technical field [0001] The invention relates to an aqueous polyurethane emulsion and its application in the technical field of electrophoresis display. Background technique [0002] Electrophoretic image display (EPID, namely electrophoretic image display) is a reflective display technology that utilizes the phenomenon of colloidal dispersed particles migrating under the action of an electric field. Its advantages are high contrast ratio, large viewing angle, high display brightness, low price, easy Realize large flat display and so on. Japanese patent JP2551783 discloses an electrophoretic display device, in which the concept of electronic ink (encapsulated electrophoretic ink) is proposed, that is, microencapsulated electrophoretic display technology (encapsulated electrophoretic display). Using the principle of electrophoresis display, the pigment particles and dark dye solutions are innovatively wrapped in microcapsules, and electrophoresis display is realized in the mi...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32C09D175/06C09D175/08C09J175/06C09J175/08G02F1/167
Inventor 罗裕杰魏松丽张磊崔德慈黄伟杰
Owner GUANGZHOU OED TECH INC
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