Preparation method of spherical potassium hexatitanate
By adjusting the ratio of titanium and potassium and adding additives in the preparation of potassium hexititate, and using high-temperature calcination process, the existing problems of poor fluidity and dispersion of potassium hexititate were solved, and spherical potassium hexitititate was prepared, suitable for Composite materials and heat-resistant insulation materials avoid fiber generation and improve the performance and cost-effectiveness of the material.
Patent Information
- Application Number
- CN202411416534.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2024-12-20
AI Technical Summary
In the existing preparation methods for potassium hexattitanate, the materials produced are mostly whiskers or powders with irregular shapes, resulting in poor fluidity and dispersion, and may produce potassium titanate fibers that are harmful to the human body when used in friction materials. It is difficult to meet the needs of composite materials and heat-resistant insulation materials.
By mixing titanium-containing raw materials and potassium-containing raw materials in a specific proportion, and adding stearic acid as an auxiliary agent, after grinding, granulation and high-temperature calcining, the heating rate and cooling rate are controlled to obtain spherical potassium hexatolidate to ensure the powder The spherical morphology and chemical structure remain unchanged.
The preparation of spherical potassium hexatoliticate is realized, which improves the flowability and dispersion of the powder, is suitable for the reinforcement of composite materials, ceramics and metals, and does not produce fibers during friction, which improves the cost-effectiveness and performance of the material.
Smart Images
Figure CN119160933A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to potassium hexatitanate, and in particular to a preparation method of spherical potassium hexatitanate. Background Art
[0002] Potassium titanate refers to a substance with the chemical formula K2O·nTiO2 (n=2, 4, 6, 8) that is crystalline after being tested by a rotating target X-ray powder diffractometer. Potassium titanate has different structures and properties depending on n and is used in different fields. Potassium dititanate has an unstable structure and can be used to prepare precursors for potassium hexatitanate and potassium octatitanate. Potassium tetratitanate has ion exchange capacity and high chemical properties, and is mainly used as a precursor for ion exchange agents and nuclear waste treatment; potassium hexatitanate and potassium octatitanate have similar structures, high mechanical properties, good chemical stability, heat insulation and wear resistance, high cost performance, and a large specific surface area. They are mainly used to reinforce composite materials, modify engineering plastics, reinforce ceramics, metals, and friction materials. They can also be used for heat insulation and heat-resistant materials, catalyst carriers, thermal spraying, and infrared reflective coatings.
[0003] The potassium hexatitanate disclosed in the existing patents is basically whiskers and irregularly shaped materials. The surface morphology of the spherical powder particles is regular, which can greatly improve the fluidity and dispersibility of the powder, eliminate the influence of agglomeration to the greatest extent, and at the same time, the defects inside the powder can also be improved; when used as a friction material, it will not produce potassium titanate fibers that are harmful to the human body. Summary of the invention
[0004] The purpose of the present invention is to provide a method for preparing spherical potassium hexatitanate, wherein titanium-containing raw materials and potassium-containing raw materials are simultaneously added with an auxiliary agent, and spherical potassium hexatitanate is obtained through grinding, mixing, calcining at high temperature, washing, drying, and classification. The present invention obtains spherical potassium hexatitanate by changing the ratio of titanium and potassium, adding an auxiliary agent, and calcining at high temperature.
[0005] To achieve the above object, the present invention provides the following technical solutions.
[0006] The embodiment of the present application discloses a preparation method of spherical potassium hexatitanate, which comprises the following steps in sequence: mixing a titanium-containing raw material and a potassium-containing raw material at a ratio of Ti / K2=5-8, adding 3-8% stearic acid to the mixture for mixing, grinding and crushing the mixed materials and mixing them evenly, then granulating the raw materials, placing the granulated raw materials in a high-temperature furnace for calcining, setting the calcining temperature to 800-1000°C, the heating rate to 5-10°C / min, calcining for 4-8 hours, then cooling to room temperature at a rate of 2-5°C / min, and washing and drying the calcined product to obtain a spherical potassium hexatitanate product.
[0007] Preferably, in the above-mentioned method for preparing spherical potassium hexatitanate, the titanium-containing raw material is one or more of rutile titanium oxide, anatase titanium oxide, brookite titanium oxide or metatitanic acid.
[0008] Preferably, in the above-mentioned method for preparing spherical potassium hexatitanate, the potassium-containing raw material is potassium carbonate.
[0009] The synthesis process of the invention is simple. The spherical potassium titanate only changes the particle morphology of the powder, while the chemical composition structure is not changed. The powder has a spherical structure and the best fluidity. It is used for reinforcing composite materials, modifying engineering plastics, reinforcing ceramics, metals, and friction materials, and will not generate fibers during friction. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0011] Figure 1 Shown is a SEM photo of the product obtained in a specific embodiment of the present invention;
[0012] Figure 2 Shown is the XRD spectrum of the product obtained in a specific embodiment of the present invention. DETAILED DESCRIPTION
[0013] The technical solutions in the embodiments of the present invention are described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Specific embodiments
[0015] The titanium-containing raw material (the titanium-containing raw material is titanium dioxide with a content of more than 97%) and the potassium-containing raw material are mixed according to the ratio of Ti / K2=6.0 and the mass fraction of stearic acid is 5%, and then the mixed raw materials are mechanically granulated; the granulated raw materials are placed in a high-temperature furnace for calcination, the sintering temperature is set to 1000°C, the heating rate is: 5°C / min, the sintering time is 6 hours, and then cooled to room temperature at 3°C / min. The sintered product is washed with water for 1-3 hours and dried at 100-200°C to obtain a spherical potassium hexatitanate product.
[0016] See the SEM photos and XRD patterns of the products. Figure 1 Right now Figure 2 .
[0017] This implementation mode is only an exemplary description of this patent and does not limit its protection scope. Personnel in this field may also make partial changes to it. As long as it does not exceed the spirit of this patent, it shall be regarded as an equivalent replacement of this patent and shall be within the protection scope of this patent.
Claims
1. A method for preparing spherical potassium hexatitanate, characterized in that: The method comprises the following steps in sequence: mixing titanium-containing raw materials and potassium-containing raw materials at a ratio of Ti / K2=5-8, adding 3-8% stearic acid into the mixture for mixing, grinding and crushing the mixed materials and mixing them evenly, granulating the raw materials, placing the granulated raw materials into a high-temperature furnace for calcining, setting the calcining temperature to 800-1000°C, heating rate to 5-10°C / min, calcining for 4-8 hours, then cooling to room temperature at a rate of 2-5°C / min, washing the calcined product with water, and drying it to obtain a spherical potassium hexatitanate product.
2. The method for preparing spherical potassium hexatitanate according to claim 1, characterized in that: The titanium-containing raw material is one or more of rutile titanium oxide, anatase titanium oxide, brookite titanium oxide or metatitanic acid.
3. The method for preparing spherical potassium hexatitanate according to claim 1, characterized in that: The potassium-containing raw material is potassium carbonate.