Preparation method of color kinescope color screen glass batch

Abstract

The invention relates to a preparation method of a batch for color screen glass of a color kinescope, which is characterized by comprising the following steps: before a coloring agent is mixed with the batch for preparing the color screen glass, premixing and diluting the coloring agent by using a diluent to obtain a premixed and diluted material; the diluent is selected from zircon powder or quartz powder; the coloring agent and the diluting agent in the premixed diluting material comprise the following components in percentage by weight in the batch for preparing the color screen glass: 0.001 to 0.003 percent of cobalt oxide, 0.006 to 0.02 percent of nickel oxide, 0 to 0.02 percent of iron oxide and 0.06 to 0.2 percent of diluting agent. According to the method, the coloring agent can be uniformly mixed, the content is stable, and the adhesion phenomenon is avoided, so that the adverse effect on the product quality caused by the fluctuation of the transmittance is avoided.

Description

Technical Field

[0001] The invention relates to the field of color screen glass production for color picture tubes, and in particular to a method for preparing a color screen glass batch material for color picture tubes. Background Art

[0002] The chromaticity coordinates and transmittance of the color screen of the display image are important parameters in the production of color cathode ray tubes, and there are strict requirements in the glass shell production process. The color of glass is caused by the absorption of light by glass. If transparent glass can absorb light in all wavelengths when white light passes through, it will appear colorless. If it only absorbs light of certain wavelengths and transmits light of another part of the wavelength, it will show the color corresponding to the part of the transmitted light. Therefore, the color of glass is a physical quantity related to the distribution of spectral transmittance, which is produced by the selective absorption of visible light passing through the glass by certain components in the glass. Therefore, the glass can usually be colored by introducing transition metal or rare earth metal ions into the glass, or certain elements or compounds can be distributed in the glass in a colloidal state, and the glass can show a certain color by dispersing or absorbing visible light.

[0003] The coloring of the color screen glass of the color picture tube generally adopts the ion coloring process, that is, certain ions are introduced into the glass to make it selectively absorb light. The mechanism of the above action is that the ions or ion groups as colorants, under the excitation of light energy, can jump from the low-energy orbit to the high-energy orbit, and absorb photons of a certain wavelength of light, so as to achieve the purpose of selective absorption of light. Colorants should generally have the characteristics of stable color, strong coloring ability, and low price. The coloring of color picture tube glass generally uses nickel oxide, cobalt oxide, and iron oxide as colorants. By adjusting their ratio, the surface of the glass presents a light blue-gray color. The increase in the content of colorants will make the color of the glass darker and the transmittance lower. The coloring effect and transmittance are closely related to the dosage of the colorant, the mixing uniformity of the colorant, and the ratio of the colorant.

[0004] In actual production, the amount of colorant varies according to the required transmittance of the color screen glass. However, no matter what transmittance of the color screen glass is produced, the amount of colorant added to the glass material is small. A slight change in the amount of colorant will affect the transmittance of the color screen glass and the quality of the color screen image.

[0005] In the past, when the glass shell industry produced color screen glass, it used the method of directly weighing and mixing the raw materials of colorants such as iron oxide, nickel oxide and cobalt oxide. That is, in the mixing process of the raw materials for manufacturing color screen glass, the colorants and other raw materials were weighed separately according to the required proportions, and then all the raw materials including the colorants were directly mixed in the mixer. Although this mixing method is simple to operate, it may lead to two problems: one is that since the amount of colorants used accounts for a small proportion of the entire glass batch, it is difficult to be evenly dispersed in the entire glass batch in the mixer, and it cannot meet the requirements for the uniformity of glass batches in the production of color screen glass; the other problem is that since the colorants have strong adhesion, it is difficult to avoid sticking or loss during the weighing and transportation process, resulting in unstable colorant content in each batch of glass batches, causing fluctuations in transmittance, and even exceeding the control specifications.

[0006] These problems affect the stability and improvement of the quality of color screen glass. Therefore, it is necessary to improve the existing mixing method to ensure that the colorant is evenly mixed, the content is stable and no adhesion occurs, so as to ensure a stable color screen glass transmittance. Summary of the invention

[0007] The present invention aims to provide a method for preparing a color screen glass batch material for a color picture tube, comprising pre-mixing and diluting the colorant with a diluent before mixing the colorant with other raw materials for preparing the color screen glass.

[0008] The present invention adopts the following technical solutions: A method for preparing a color screen glass batch material for a color picture tube, comprising preparing a color screen glass batch material, and adding a colorant in a specified proportion to the batch material, wherein the colorant is cobalt oxide, nickel oxide, and iron oxide, and the method is characterized in that: Before the colorant is mixed with the batch material for preparing the color screen glass, the colorant is premixed and diluted with a diluent to obtain a premixed diluted material; The diluent is selected from zircon powder or quartz powder; The weight percentages of the colorant and diluent in the premixed diluent in the preparation of the color screen glass batch are 0.001-0.003% of cobalt oxide, 0.006-0.02% of nickel oxide, 0-0.02% of iron oxide and 0.06-0.2% of diluent respectively.

[0009] On the basis of the above technical solutions, there are the following further technical solutions: First, add part of the diluent to the pre-mixer, then add all the colorants required for the glass batch, and finally add the remaining diluent; preferably, the amount of the diluent added twice is equal.

[0010] The particle size of the premixed diluent does not differ from the particle size of the colorant by more than ±10%.

[0011] The premixed diluted material can also be put into the colorant silo for standby use, and then mixed with other raw materials in the glass batch according to the requirements of the glass batch for producing the desired color screen glass.

[0012] The diluent mentioned in the present invention refers to a substance used to dilute the colorant. The diluent can improve the distribution uniformity of the colorant in the raw material for preparing the color screen glass without affecting the properties of the colorant itself. The diluent used in the colorant premixing method of the present invention is one of the raw materials for preparing the color screen glass, and the particle size of the diluent should be close to that of the colorant, and preferably the particle size difference between the two does not exceed ±10%. Generally, too large a difference in particle size will lead to uneven mixing of the colorant and the diluent. Commonly used diluents include, for example, zircon powder, quartz powder or other raw materials for preparing color screen glass.

[0013] The present invention has certain restrictions on the premixing time of premixing dilution. If the time is too short, it is easy to cause uneven mixing. If the time is too long, it is easy to cause the hardness and dosage of the raw materials to cause the materials that have been mixed evenly to be stratified again, thereby causing uneven mixing. In addition, the mixing efficiency needs to be considered. The premixing time of the colorant is related to the mixing amount and the structure of the premixer. The premixing time should generally be controlled within 10 minutes. For a spiral premixer, the premixing time is preferably 6 minutes, and for a disc stirring premixer, the premixing time is preferably 3 minutes.

[0014] The advantage of the premixing method of the present invention is that it can prevent the colorant from sticking to the hopper and the chute to the greatest extent. In addition, the method of premixing and diluting the colorant and then mixing it with other raw materials can ensure the uniform distribution of trace colorants in the glass batch material, meeting the requirements of glass batch material production in the color picture tube color screen glass industry.

[0015] The following are specific examples of embodiments of the present invention, but the present invention is not limited to the following examples. DETAILED DESCRIPTION Example

[0016] According to the output and product transmittance, the required weight of cobalt oxide with a particle size of less than 105µm, nickel oxide with a particle size of less than 105µm, iron oxide with a particle size of less than 105µm, and zircon powder with a particle size of less than 116µm or quartz powder with a particle size of less than 149µm is calculated and accurately weighed, and the weights are shown in Table 1 and Table 2. Half of the zircon powder (or quartz powder) is added to the premixer through the feeding port, and then the cobalt oxide, nickel oxide and iron oxide are concentrated together and added to the premixer, and then the other half of the zircon powder or quartz powder is added for premixing. After premixing, the colorant is put into the colorant silo through the discharge gate for standby use. For specific premixing conditions and effects, please refer to the table below: Table 1: Premixed Example of Medium Transparency Color Screen Glass Colorant

[0017] *Uniformity: The uniformity of distribution of each component in the glass batch after the glass raw materials are accurately weighed and mixed according to the batching list to form the batch. Uniformity is measured using the conductivity method.

[0018] Note: 1. In the prior art, the uniformity of the colorant distribution in the glass batch is 90-93%. 2. The adhesion data of the colorant in the glass batch in the prior art is 5-10%, while the adhesion data of the colorant in the glass batch of the present invention is 0.5-1%.

[0019] Table 2: Premixed Example of Low Transmittance Glass Colorant

[0020] Note: 1. In the prior art, the uniformity of the colorant distribution in the glass batch is 90-93%. 2. The adhesion data of the colorant in the glass batch in the prior art is 5-10%, while the adhesion data of the colorant in the glass batch of the present invention is 0.5-1%.

Claims

1. A method for preparing a color screen glass batch material for a color picture tube, comprising preparing a color screen glass batch material, and adding a colorant in a specified proportion to the batch material, wherein the colorant is cobalt oxide, nickel oxide, and iron oxide, and characterized in that: Before the colorant is mixed with the batch material for preparing the color screen glass, the colorant is premixed and diluted with a diluent to obtain a premixed diluted material; The diluent is selected from zircon powder or quartz powder; The weight percentages of the colorant and diluent in the premixed diluent in the preparation of the color screen glass batch are 0.001-0.003% of cobalt oxide, 0.006-0.02% of nickel oxide, 0-0.02% of iron oxide and 0.06-0.2% of diluent respectively.

2. The method for preparing a color screen glass batch material for a color picture tube according to claim 1, characterized in that First add part of the diluent to the pre-mixer, then add all the colorants required for the glass batch, and finally add the rest of the diluent.

3. The method for preparing a color screen glass batch material for a color picture tube according to claim 2, characterized in that The amount of diluent added twice is equal.

4. A method for preparing a color screen glass batch material for a color picture tube according to claim 1, 2 or 3, characterized in that The particle size of the premixed diluent does not differ from the particle size of the colorant by more than ±10%.

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