Rare earth (RES) display raw material for electronic paper and preparation method thereof

Abstract

The invention discloses a rare earth RES display raw material for electronic paper and a preparation method, and belongs to the technical field of rare earth display materials. The invention relates to a rare earth (RES) display raw material for electronic paper. The RES display raw material comprises the following raw materials in parts by mass: 80-95 parts of a component A; 5 to 20 parts of a component B; by using the specific combination of cerium sulfide and sodium sulfide or praseodymium carbonate and chromium oxide and the like, excellent red and green display can be realized, and compared with the traditional electronic paper color developing material, the color variety of the electronic paper is effectively enriched, so that the electronic paper can present richer and brighter colors, the color rendition degree and saturation degree are effectively improved, and the electronic paper color developing material is suitable for popularization and application. The visual experience is improved; meanwhile, the rare earth material is added into the display material, so that the chemical stability and the optical stability of the display material can be effectively improved, it is ensured that the electronic paper can continuously provide a high-quality display effect in various complex environments, and the service life of the electronic paper product is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of rare earth display materials, and in particular to a rare earth (RES) display raw material for electronic paper and a preparation method thereof. Background Art

[0002] In the current digital age, electronic paper, as a new display technology, has been widely used in many fields such as e-readers, electronic price tags, wearable devices, etc. because of its advantages such as paper-like visual effects, low power consumption, and eye protection.

[0003] Traditional e-paper color display materials have a limited variety of colors, and their color reproduction and vividness are insufficient, making it difficult to meet users' needs for high-quality color display. For example, common black-and-white e-paper can only present simple black and white colors and cannot display rich images and color information. Although some color e-paper can display a variety of colors, compared with traditional display screens, their color saturation and contrast are still far behind, and the image display effect may not be vivid and realistic enough. In addition, under different environmental conditions, such as temperature and humidity changes and after long-term use, the display color of e-paper is prone to change, which may lead to a decline in display quality and affect the user experience. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems raised in the above background technology and to propose a rare earth RES display raw material for electronic paper and a preparation method.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: a rare earth RES display raw material for electronic paper, comprising the following raw materials in parts by weight: component A: 80-95 parts; component B: 5-20 parts.

[0006] Preferably, the component A is cerium sulfide, and the component B is sodium sulfide.

[0007] Preferably, the component A is praseodymium carbonate, and the component B is chromium oxide.

[0008] A method for preparing rare earth RES display raw materials for electronic paper, comprising the following steps: A1. Dissolving cerium carbonate: adding cerium carbonate and a strong acid to water and stirring thoroughly to dissolve the cerium carbonate to obtain a cerium carbonate solution; A2. Generating cerium sulfide sol: mixing the prepared cerium carbonate solution and sodium sulfide solution, stirring and reacting to obtain cerium sulfide sol; A3. Doping with sodium sulfide: adding sodium sulfide to the cerium sulfide sol; A4. Filtration and washing: Filter the generated cerium sulfide sol to separate the solid precipitate, and then wash the solid precipitate with deionized water to remove residual sodium sulfate and impurities; A5. Drying: Dry the washed cerium sulfide precipitate in a drying furnace to remove moisture; A6. High temperature calcination: Take out the dried cerium sulfide and place it in a calcination furnace for 2-4 hours; A7. Grinding: The calcined cerium sulfide is taken out and placed in a ball mill for grinding to obtain rare earth particle raw materials.

[0009] A method for preparing rare earth RES display raw materials for electronic paper, comprising the following steps: B1. Dissolving praseodymium carbonate and chromium carbonate: adding praseodymium carbonate and chromium carbonate to deionized water, then adding strong acid, stirring thoroughly to dissolve to obtain a mixed solution; B2. Precipitation reaction: add a precipitant and a crystal form control agent to the mixed solution, stir thoroughly to react and produce a precipitate; B3. Filter and wash to filter out the precipitate produced by the reaction and rinse with deionized water to remove residual ammonium sulfate and impurities on the surface; B4. Drying: Place the washed precipitate in a drying oven to dry it to remove moisture; B5. High temperature sintering: Place the dried precipitate in a sintering furnace and sinter for 2-4 hours; B6. Grinding: The sintered precipitate is placed in a ball mill for grinding to obtain rare earth particle raw materials.

[0010] Furthermore, the drying temperature of the drying furnace is 60-80°C.

[0011] Furthermore, the particle size of the ground rare earth particle raw material is less than or equal to 300 nm.

[0012] Furthermore, the strong acid is any one of sulfuric acid, hydrochloric acid and nitric acid.

[0013] Furthermore, the calcination temperature of the calcination furnace is 800-1000°C.

[0014] Furthermore, the sintering temperature of the sintering furnace is 900-1100°C.

[0015] Compared with the prior art, the present invention provides a rare earth RES display raw material for electronic paper and a preparation method thereof, which has the following beneficial effects: The present invention can achieve excellent red and green display by using specific combinations such as cerium sulfide and sodium sulfide or praseodymium carbonate and chromium oxide. Compared with traditional electronic paper color-developing materials, it effectively enriches the color types of electronic paper, enables electronic paper to present richer and brighter colors, effectively improves color reproduction and saturation, and enhances the visual experience; at the same time, by adding rare earth materials to the display material, the chemical stability and optical stability of the display material can be effectively improved, ensuring that the electronic paper can continue to provide high-quality display effects in various complex environments, thereby extending the service life of the electronic paper product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a flow chart for preparing rare earth raw materials in Example 1 of the present invention; Figure 2 This is a flow chart for preparing rare earth raw materials in Example 2 of the present invention. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0018] Example 1: A rare earth RES display material for electronic paper, comprising the following materials: Cerium sulfide: 90 parts Sodium sulfide: 10 parts.

[0019] Reference Figure 1 , in the specific preparation, the steps are as follows: Dissolving cerium carbonate: Add 500 mL of deionized water to a reactor equipped with a stirring device, then weigh 90 g of cerium carbonate and add it to the water. Then slowly add 50 mL of 3 mol / L hydrochloric acid. Turn on the stirrer and stir at 300 rpm for 2 hours to fully dissolve the cerium carbonate to obtain a cerium carbonate solution. Generating cerium sulfide sol: dissolving 10 g of sodium sulfide in 200 mL of deionized water to prepare a sodium sulfide solution; slowly adding the sodium sulfide solution dropwise to the above cerium carbonate solution while maintaining a stirring speed of 200 r / min and controlling the addition time to about 30 minutes. After the addition is completed, continue stirring and reacting for 1 hour to obtain a cerium sulfide sol; Doping with sodium sulfide: add 10g of sodium sulfide to the cerium sulfide sol and continue stirring for 30min to evenly dope the sodium sulfide into the cerium sulfide sol; Filtration and washing: Filter the cerium sulfide sol using a vacuum filtration device to obtain a solid precipitate, and then wash the solid precipitate multiple times with deionized water. Add 200 mL of deionized water each time, stir for 10 minutes, and then filter. Repeat the washing three times to remove residual sodium sulfate and other impurities. Drying: Transfer the washed cerium sulfide precipitate to a drying oven, set the drying temperature to 70°C, and the drying time to 12 hours to remove moisture from the precipitate; High temperature calcination: take out the dried cerium sulfide and put it into the calcination furnace, and calcine it at 900℃ for 3h; Grinding: The calcined cerium sulfide is taken out and placed in a ball mill, an appropriate amount of zirconium oxide balls are added, and the ball mill is ground at a speed of 400 r / min for 6 hours to obtain a rare earth particle raw material with a particle size of less than or equal to 300 nm.

[0020] Example 2: A rare earth RES display material for electronic paper, comprising the following materials: Praseodymium carbonate: 85 parts; Chromium oxide: 15 parts.

[0021] Reference Figure 2 , in the specific preparation, the steps are as follows: Dissolving praseodymium carbonate and chromium carbonate: Add 600 mL of deionized water to a reactor, weigh 85 g of praseodymium carbonate and 15 g of chromium carbonate, add them to the water, then slowly add 60 mL of 2.5 mol / L nitric acid, turn on the stirrer, and stir at 350 rpm for 2.5 h to fully dissolve the praseodymium carbonate and chromium carbonate to obtain a mixed solution; Precipitation reaction: Weigh 20g of ammonium bicarbonate as a precipitant and 2g of aminoacetic acid as a crystal form control agent, dissolve them in 100mL of deionized water to prepare a mixed solution; slowly add the mixed solution dropwise to the above mixed solution while maintaining the stirring speed at 250r / min. The addition time is controlled to be about 40min. After the addition is completed, continue stirring and react for 1.5h to produce a precipitate; Filtration and washing: Use a centrifuge to centrifuge the reaction solution to obtain a precipitate; then rinse the precipitate with deionized water, adding 250 mL of deionized water each time, stirring for 15 minutes, and then centrifuging again. Repeat the rinse four times to remove residual ammonium sulfate and other impurities on the surface; Drying: Transfer the washed precipitate to a drying oven, set the drying temperature to 65°C, and the drying time to 15 hours to remove moisture from the precipitate; High temperature sintering: put the dried precipitate into the sintering furnace and sinter it at 1000℃ for 3h; Grinding: Place the sintered precipitate into a ball mill, add an appropriate amount of alumina balls, and grind at a speed of 450 r / min for 7 hours to obtain rare earth particle raw materials with a particle size of less than or equal to 300 nm.

[0022] Example 3: A rare earth RES display material for electronic paper, which is basically the same as Example 1, except that it includes the following raw materials: Cerium sulfide: 80 parts; Sodium sulfide: 20 parts.

[0023] Example 4: A rare earth RES display material for electronic paper, which is basically the same as Example 1, except that it includes the following raw materials: Cerium sulfide: 95 parts; Sodium sulfide: 5 parts.

[0024] Example 5: A rare earth RES display material for electronic paper, which is basically the same as Example 2, except that it includes the following raw materials: Praseodymium carbonate: 90 parts; Chromium oxide: 10 parts.

[0025] Example 6: A rare earth RES display material for electronic paper, which is basically the same as Example 2, except that it includes the following raw materials: Praseodymium carbonate: 95 parts; Chromium oxide: 5 parts.

[0026] The present invention can achieve excellent red and green display by using specific combinations such as cerium sulfide and sodium sulfide or praseodymium carbonate and chromium oxide. Compared with traditional electronic paper color-developing materials, it effectively enriches the color types of electronic paper, enables electronic paper to present richer and brighter colors, effectively improves color reproduction and saturation, and enhances the visual experience; at the same time, by adding rare earth materials to the display material, the chemical stability and optical stability of the display material can be effectively improved, ensuring that the electronic paper can continue to provide high-quality display effects in various complex environments, thereby extending the service life of the electronic paper product.

[0027] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A rare earth RES display material for electronic paper, characterized in that: Including the following raw materials by weight: Component A: 80-95 parts; Component B: 5-20 parts.

2. The rare earth RES display material for electronic paper according to claim 1, characterized in that: The component A is cerium sulfide, and the component B is sodium sulfide.

3. The rare earth RES display material for electronic paper according to claim 1, characterized in that: The component A is praseodymium carbonate, and the component B is chromium oxide.

4. A method for preparing the rare earth RES display material for electronic paper according to claim 2, characterized in that: Here are the steps: A1. Dissolving cerium carbonate: adding cerium carbonate and a strong acid to water and stirring thoroughly to dissolve the cerium carbonate to obtain a cerium carbonate solution; A2. Generating cerium sulfide sol: mixing the prepared cerium carbonate solution and sodium sulfide solution, stirring and reacting to obtain cerium sulfide sol; A3. Doping with sodium sulfide: adding sodium sulfide to the cerium sulfide sol; A4. Filtration and washing: Filter the generated cerium sulfide sol to separate the solid precipitate, and then wash the solid precipitate with deionized water to remove residual sodium sulfate and impurities; A5. Drying: Dry the washed cerium sulfide precipitate in a drying furnace to remove moisture; A6. High temperature calcination: Take out the dried cerium sulfide and place it in a calcination furnace for 2-4 hours; A7. Grinding: The calcined cerium sulfide is taken out and placed in a ball mill for grinding to obtain rare earth particle raw materials.

5. A method for preparing the rare earth RES display material for electronic paper according to claim 3, characterized in that: Here are the steps: B1. Dissolving praseodymium carbonate and chromium carbonate: adding praseodymium carbonate and chromium carbonate to deionized water, then adding strong acid, stirring thoroughly to dissolve to obtain a mixed solution; B2. Precipitation reaction: add a precipitant and a crystal form control agent to the mixed solution, stir thoroughly to react and produce a precipitate; B3. Filter and wash to filter out the precipitate produced by the reaction and rinse with deionized water to remove residual ammonium sulfate and impurities on the surface; B4. Drying: Place the washed precipitate in a drying oven to dry it to remove moisture; B5. High temperature sintering: Place the dried precipitate in a sintering furnace and sinter for 2-4 hours; B6. Grinding: The sintered precipitate is placed in a ball mill for grinding to obtain rare earth particle raw materials.

6. The method for preparing a rare earth RES display raw material for electronic paper according to any one of claims 4-5, characterized in that: The drying temperature of the drying furnace is 60-80°C.

7. The method for preparing a rare earth RES display material for electronic paper according to any one of claims 4-5, characterized in that: The particle size of the ground rare earth particle raw material is less than or equal to 300 nm.

8. The method for preparing a rare earth RES display material for electronic paper according to any one of claims 4-5, characterized in that: The strong acid is any one of sulfuric acid, hydrochloric acid and nitric acid.

9. The method for preparing a rare earth RES display material for electronic paper according to claim 4, characterized in that: The calcination temperature of the calcination furnace is 800-1000°C.

10. The method for preparing a rare earth RES display material for electronic paper according to claim 5, characterized in that: The sintering temperature of the sintering furnace is 900-1100°C.

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