Liquid amonia pressurized precipitation and hydrothermal modification process for preparing magnesium hydroxide fire retardant
Title：
Liquid amonia pressurized precipitation and hydrothermal modification process for preparing magnesium hydroxide fire retardant
Application Number：
 200510086473
Application Date：
 2005/09/23
Announcement Date：
 2006/03/01
Pub. Date：
Publication Number：
 1740269
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 C09K 21/02, C01F 5/20
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Xiang Lan, Zhang Yingcai, Wu Qingliu, Wei Fei
Key Words：
 Liquid amonia,pressurized precipitation,hydrothermal modification,magnesium hydroxide fire retardant
Abstract：
 The present invention belongs to the field of inorganic chemical technology, and proposes one kind of liquid ammonia pressurized precipitation and hydrothermal modification process for preparing magnesium hydroxide fire retardant. Through the first precipitation reaction of magnesium chloride material with liquid ammonia as precipitant at 15-90 deg.c and sealed and pressurized conditions to synthesize magnesium hydroxide, and the subsequent modification of the normal temperature synthesized magnesium hydroxide at 100-250 deg.c in the presence of dispersant of 0.01-0.1 % for 1-6 hr, magnesium hydroxide fire retardant is prepared, which has primary granularity of 0.3-2.0 micron, average coagulation particle size of 1.0-4.0 micron, specific surface area of 5-30 sq m/g, and magnesium hydroxide content over 98 %. The magnesium hydroxide fire retardant may be used in rubber, plastic, building material, etc.
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2008-4-17
  Selected patents owned by Tsinghua University filed in 2005 are loaded.
2008-3-31
  Selected patents owned by Tsinghua University filed in 2006 and 2007 are load.







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