Method for preparing boron-containing ceramic slurry

Abstract

The embodiment of the present application provides a preparation method of ceramic slurry containing boron elements, which comprises the following steps: in the slurry sanding process, the boron elements in the slurry are pretreated, so that the boron elements no longer crosslink with the PVA binder; before and after the end of the slurry sanding, different concentrations of PVA solution are added into the slurry respectively, and the stirring is continued, so that the preparation of the ceramic slurry containing boron elements is completed. The scheme solves the problems of flocculation, stratification and easy settlement of the slurry.

Description

Technical Field

[0001] This invention relates to the field of ceramic slurry technology, and in particular to a method for preparing a boron-containing ceramic slurry. Background Technology

[0002] In the preparation of boron-containing ceramic slurries, PVA-based adhesives are used. PVA-based adhesives are the most widely used adhesives in water-based ceramic slurry systems. These PVA-based adhesives will undergo a cross-linking reaction with borate ions in the ceramic slurry, leading to slurry flocculation, increased viscosity, and rapid stratification and sedimentation of the slurry without stirring, or even failure. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a method for preparing boron-containing ceramic slurry to solve the technical problems of flocculation, stratification, and sedimentation in the preparation process of boron-containing ceramic slurry in the prior art. The method includes: During the slurry grinding process, the boron element in the slurry is pretreated to prevent the boron element from undergoing a cross-linking reaction with PVA-based adhesives. Before and after the slurry sand milling was completed, PVA solutions of different concentrations were added to the slurry and stirred continuously to complete the preparation of boron-containing ceramic slurry.

[0004] Compared with the prior art, the beneficial effects achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this specification include at least the following: Pre-treatment of the boron element in the slurry during the slurry milling process prevents the boron element from undergoing a cross-linking reaction with PVA-based adhesives, thus avoiding adverse problems such as slurry flocculation, increased viscosity, stratification, and sedimentation, and even failure caused by the cross-linking reaction between boron and PVA-based adhesives; furthermore, before and after the slurry milling is completed, different concentrations of PVA solution are added to the slurry and continuously stirred to reduce the degree of reaction, further preventing the cross-linking reaction between boron and PVA-based adhesives. The above-mentioned method for preparing boron-containing ceramic slurry achieves the maintenance of the stability of the ceramic slurry during the preparation process without changing the ceramic formula components and retaining the use of PVA as a binder, preventing failure phenomena such as flocculation, stratification, and sedimentation. This solves the problems of slurry flocculation, stratification, and easy sedimentation, and facilitates the smooth progress of subsequent processes. Attached Figure Description

[0005] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0006] Figure 1 This is a flowchart of a method for preparing a boron-containing ceramic slurry according to an embodiment of the present invention. Detailed Implementation

[0007] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0008] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0009] In this embodiment of the invention, a method for preparing a boron-containing ceramic slurry is provided, such as... Figure 1 As shown, the method includes: Step S101: During the slurry sand milling process, the boron element in the slurry is pretreated so that the boron element no longer undergoes a cross-linking reaction with the PVA adhesive; Step S102: Before and after the slurry sand milling is completed, PVA solution of different concentrations is added to the slurry and stirred continuously to complete the preparation of boron-containing ceramic slurry.

[0010] In specific implementation, in order to prevent boron from undergoing a cross-linking reaction with PVA adhesives, this application proposes to pretreat the boron in the slurry. Specifically, the pretreatment process can be to chemically or physically treat the boron in the slurry to achieve the goal of preventing it from undergoing a cross-linking reaction with PVA adhesives. For example, a preset substance can be added to the slurry to encapsulate or neutralize the boron, thus preventing it from undergoing a cross-linking reaction with PVA adhesives.

[0011] For example, the preset substance can be an alkanolamine. When an alkanolamine is added to the slurry, the nitrogen atom and the adjacent hydroxyl group in the alkanolamine coordinate with the boron atom in the slurry to form a chelate, so that the boron atom no longer undergoes a cross-linking reaction with the PVA adhesive.

[0012] Specifically, during the slurry grinding process, 0.5-2% of alkanolamines are added to the slurry. The nitrogen atoms and adjacent hydroxyl groups of the alkanolamines coordinate with boron atoms to form stable chelates, which can effectively shield boron from cross-linking with PVA.

[0013] For example, the preset material can be an aluminum gel-like material. When an aluminum gel-like material is added to the slurry, under an alkaline environment, the hydroxyl complex formed by the hydrolysis of aluminum ions in the aluminum gel-like material undergoes a complexation reaction with borate ions in the slurry to form an aluminum borooxide complex anion, which prevents borate ions from undergoing a cross-linking reaction with PVA-like adhesives.

[0014] Specifically, during the slurry grinding process, 1-2.5% of aluminum gel-like substances are added to the slurry. Under alkaline conditions (such as pH>9), the aluminum ions of the aluminum gel-like substances hydrolyze to form various hydroxyl complexes ([Al(OH)]-). The aluminum hydroxyl complexes will undergo a complexation reaction with the borate ions in the slurry to form aluminum borooxide complex anions, thereby consuming the boron ions in the slurry and preventing the boron ions from undergoing cross-linking reactions with PVA.

[0015] In practice, to further avoid cross-linking reactions between boron and PVA adhesives, this application proposes adding different concentrations of PVA solution to the slurry before and after sand milling, and continuously stirring to reduce the degree of reaction.

[0016] For example, within 30 minutes before the end of sand milling, add 0.3-0.6% of a low-polymerization-degree PVA solution to the slurry and reduce the mill speed to 800-1000 rpm to ensure uniform dispersion and pre-coating of solid particles in the slurry. This can reduce slurry flocculation caused by the cross-linking reaction between boron and PVA hydroxyl groups.

[0017] Then, during the homogenization process after the slurry is milled, a high degree of polymerization PVA solution is slowly added to the slurry and stirred continuously for more than 2 hours to ensure the pressing performance of the granulated powder.

[0018] The embodiments of this invention achieve the following technical effects: Pre-treatment of boron in the slurry during the sand milling process prevents boron from undergoing a cross-linking reaction with PVA-based adhesives, thus avoiding adverse problems such as slurry flocculation, increased viscosity, stratification, and sedimentation, and even failure caused by the cross-linking reaction between boron and PVA-based adhesives. Furthermore, before and after the sand milling process, different concentrations of PVA solution are added to the slurry, with continuous stirring to reduce the degree of reaction and further prevent cross-linking reactions between boron and PVA-based adhesives. The above-mentioned method for preparing boron-containing ceramic slurry maintains the stability of the ceramic slurry during preparation without altering the ceramic formulation and retaining PVA as a binder, preventing flocculation, stratification, sedimentation, and other failure phenomena. This solves the problems of slurry flocculation, stratification, and easy sedimentation, ensuring the smooth progress of subsequent processes.

[0019] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, various modifications and variations can be made to the embodiments of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a boron-containing ceramic slurry, characterized in that, include: During the slurry grinding process, the boron element in the slurry is pretreated to prevent the boron element from undergoing a cross-linking reaction with PVA-based adhesives. Before and after the slurry sand milling was completed, PVA solutions of different concentrations were added to the slurry and stirred continuously to complete the preparation of boron-containing ceramic slurry.

2. The method as described in claim 1, characterized in that, Pretreatment of the boron element in the slurry to prevent it from undergoing crosslinking reactions with PVA-based adhesives includes: A preset substance is added to the slurry. The preset substance encapsulates or neutralizes boron, so that boron no longer undergoes a cross-linking reaction with PVA-based adhesives.

3. The method as described in claim 2, characterized in that, A pre-defined substance is added to the slurry. This pre-defined substance encapsulates or neutralizes boron, preventing boron from undergoing a cross-linking reaction with PVA-based adhesives. This includes: An alkanolamine is added to the slurry, and the nitrogen atom and adjacent hydroxyl group in the alkanolamine coordinate with the boron atom in the slurry to form a chelate, so that the boron atom no longer undergoes a cross-linking reaction with the PVA adhesive.

4. The method as described in claim 3, characterized in that, The addition of alkanolamines to the slurry includes: Add 0.5-2% of an alkanolamine to the slurry.

5. The method as described in claim 2, characterized in that, A pre-defined substance is added to the slurry. This pre-defined substance encapsulates or neutralizes boron, preventing boron from undergoing a cross-linking reaction with PVA-based adhesives. This includes: When aluminum gel-like substances are added to the slurry, under alkaline conditions, the hydroxyl complexes formed by the hydrolysis of aluminum ions in the aluminum gel-like substances undergo a complexation reaction with borate ions in the slurry to form aluminum borooxide complex anions, thereby preventing borate ions from undergoing cross-linking reactions with PVA-type adhesives.

6. The method as described in claim 5, characterized in that, An aluminum gel-like substance is added to the slurry, including: Add 1-2.5% aluminum gel to the slurry.

7. The method as described in claim 5, characterized in that, The pH of the alkaline environment is greater than 9.

8. The method according to any one of claims 1 to 7, characterized in that, Before and after the slurry milling process, PVA solutions of different concentrations were added to the slurry, including: Within 30 minutes before the end of the slurry sand milling, add 0.3-0.6% of low-polymerization-degree PVA solution to the slurry and reduce the speed of the sand mill to 800-1000 rpm.

9. The method according to any one of claims 1 to 7, characterized in that, Before and after the slurry milling process, PVA solutions of different concentrations were added to the slurry, including: During the homogenization process after the slurry is sand-milled, a high-polymerization-degree PVA solution is added to the slurry and stirred continuously until homogeneous.

10. The method as described in claim 9, characterized in that, Stir continuously for at least 2 hours.

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