Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method of preparing nanometer magnesium oxide using uniform precipitation-supercritical carbon dioxide drying method

A nano-magnesium oxide, uniform precipitation technology, applied in the direction of magnesium oxide, can solve the problem of serious agglomeration, achieve good adsorption performance, lower operating temperature and pressure, and easy control

Inactive Publication Date: 2005-03-23
DALIAN UNIV OF TECH
View PDF0 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When preparing nano-magnesium oxide by liquid phase method, adding an appropriate dispersant can solve the problem of agglomeration in the liquid phase reaction stage, but the agglomeration is still very serious when the powder is dried by ordinary drying methods

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of preparing nanometer magnesium oxide using uniform precipitation-supercritical carbon dioxide drying method
  • Method of preparing nanometer magnesium oxide using uniform precipitation-supercritical carbon dioxide drying method
  • Method of preparing nanometer magnesium oxide using uniform precipitation-supercritical carbon dioxide drying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] (1) 101.5 grams of magnesium chloride hexahydrate, 120.0 grams of urea and 250 grams of water are put into a three-necked flask of 1000 milliliters, and 1.0 grams of polyethylene glycol-1000 and 0.8 grams of polyethylene glycol-400 are added simultaneously, and the water bath is heated to 363K, React for 4 hours, age for 5 hours, filter with suction, wash with deionized water until no chloride ion is detected by silver nitrate solution.

[0028] (2) The precipitate was washed 10 times with absolute ethanol, then soaked for 24 hours, filtered with suction, and washed 6 times to ensure that the water was completely replaced.

[0029] (3) The product obtained in (2) is put into a supercritical dryer, and the CO from the steel cylinder 2 After the gas is liquefied by the condenser, pressurized by the high-pressure pump and heated by the heater, the gas reaches a supercritical state, and maintains a constant temperature and pressure at 16MPa and 333K for 3 hours. When the et...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A process for preparing nano-magnesium oxide by uniform deposition-supercritical CO2 drying method includes such steps as preparing magnesium hydroxide deposit in aqueous solution by uniform deposition method, displacing water from the deposit by alcohol, removing alcohol from deposit by supercritical CO2 drying method, separating alcohol for recovering it, cyclic use of CO2, and calcining the dried magnesium hydroxide.

Description

technical field [0001] The invention belongs to the technical field of nano material preparation, in particular to a new process for preparing nano MgO powder. Background technique [0002] Nano-magnesium oxide is a new type of inorganic functional material, which has broad application prospects in ceramics, enamel, medicine, cosmetics, paint, paper and aviation. The combination of nano-magnesia and high polymer or other materials has good microwave absorption function. Nano-magnesium oxide can be sintered at low temperature without sintering aids to make dense fine-grained ceramics. This kind of ceramics is expected to be developed into a cutting-edge material used under high temperature and high corrosion conditions. At the same time, nano-magnesia can be used as a sintering aid and stabilizer for preparing high-quality nano-phase zirconia ceramics, alumina ceramics, and iron oxide ceramics. Nano magnesium oxide can also be used as lipolytic agent and pharmaceutical poli...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01F5/02
Inventor 王宝和于才渊张文博张伟
Owner DALIAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com