Method for preparing nano-spherical barium titanate through micro-channel continuous process

A continuous method, nano-scale technology, applied in the direction of titanate, nanotechnology, alkaline earth metal titanate, etc., can solve the problems of long reaction cycle, cumbersome feeding operation, etc., and achieve the effect of accelerating reaction efficiency and shortening reaction cycle

Inactive Publication Date: 2019-07-23
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"A process for continuously preparing barium titanate powder" (CN 101434407) discloses a method for preparing BaTiO2 using a continuous synthesis reactor. 3 Due to the cumbersome material feeding operation, the minimum inner diameter of the reactor used is 20-30mm of the heating part, which is a casing heat exchanger with an internal inlet temperature higher than 180°C heat transfer oil, and the material needs to be kept warm Part of the reaction tube stays for 150-300min, the reaction cycle is longer

Method used

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  • Method for preparing nano-spherical barium titanate through micro-channel continuous process
  • Method for preparing nano-spherical barium titanate through micro-channel continuous process
  • Method for preparing nano-spherical barium titanate through micro-channel continuous process

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Experimental program
Comparison scheme
Effect test

Embodiment

[0036] The experiment uses cheap soluble barium salt as BaCl 2 2H 2 O, analytically pure; soluble titanium salt is TiCl 4 , analytically pure; the precipitating agent used was NaOH, analytically pure; the constant temperature water bath was set to 90°C before the experiment.

example 1

[0038] Stir the 3mol / L NaOH solution evenly and cool it down to room temperature as liquid A. At the same time, prepare 0.15mol / L BaCl 2 solution; according to the Ba / Ti molar ratio of 1.10, the TiCl 4 Add it dropwise into deionized water to obtain the same amount of Ti liquid, and then mix the two evenly to obtain B liquid. Put liquid A and liquid B at a flow rate of 1mL / min into the T-type mixer through a convection pump, flow through a microchannel pipeline with a length of 5m and an inner diameter of 1mm, centrifuge the white precipitate obtained at the outlet of the pipeline, and wash it several times After drying in an oven at 80°C for 12 hours, spherical BaTiO with an average particle size of 40 nm was obtained. 3 Powder.

example 2

[0040] Stir the 3mol / L NaOH solution evenly and cool it down to room temperature as liquid A. At the same time, prepare 0.15mol / L BaCl 2 solution; according to the Ba / Ti molar ratio of 1.0, the TiCl 4 Add it dropwise into deionized water to obtain the same amount of Ti liquid, and then mix the two evenly to obtain B liquid. Pour liquid A and liquid B into the T-type mixer through a convection pump at a flow rate of 2 mL / min, flow through a microchannel pipeline with a length of 5 m and an inner diameter of 0.5 mm, and centrifuge the white precipitate obtained at the outlet of the pipeline for several times. After washing, dry in an oven at 80°C for 12 hours to obtain spherical BaTiO with an average particle size of 100 nm 3 Powder.

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Abstract

The invention relates to a method for preparing nanoscale spherical barium titanate by a micro-channel continuous method. The method comprises the following steps: (1) preparing a Ba solution, a Ti solution and alkali liquor; (2) pumping the mixed solution of the Ba solution and the Ti solution and alkali liquor into a T-shaped or Y-shaped mixer, and performing a reaction at a given temperature, wherein the mixer is provided with micro pipelines with the inner diameter of 0.5-1 mm. According to the method, the shape and the particle size of the spherical BaTiO3 powder can be improved for laying good foundation for industrial continuous production.

Description

technical field [0001] The invention belongs to the field of preparing spherical barium titanate, and in particular relates to a method for preparing nanoscale spherical barium titanate by a microchannel continuous method. Background technique [0002] Barium titanate (BaTiO) with a perovskite structure 3 ) In addition to electrical properties such as dielectric and piezoelectric, it also has the characteristics of good biocompatibility, high reflectivity, high whiteness, uniform microscopic particle size, etc., and can be used as a medical dry film for rapid detection of human health indicators Raw materials for the diffusion layer. Therefore, the preparation of spherical barium titanate powder is one of the key technologies in the field of medical testing. [0003] At present, the solid-phase method and the liquid-phase method are the two methods to prepare BaTiO 3 The main method of powder. Preparation of BaTiO by Solid Phase Method 3 is through the raw material BaCO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00B82Y40/00
CPCB82Y40/00C01G23/006C01P2002/72C01P2004/03C01P2004/32C01P2004/62C01P2004/64
Inventor 靳海波张宝丹郭晓燕杨索和何广湘马磊张荣月
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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