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Preparation method of pillared hydrotalcite

A hydrotalcite and pillared technology, which is applied in chemical instruments and methods, oxide/hydroxide preparation, tungsten compounds, etc., can solve the problems that pillared hydrotalcite is easy to agglomerate, and the preparation method takes a long time to synthesize.

Inactive Publication Date: 2012-01-11
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem of easy agglomeration of existing pillared hydrotalcites and the long synthesis time of the preparation method, and provides a preparation method of pillared hydrotalcites

Method used

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  • Preparation method of pillared hydrotalcite
  • Preparation method of pillared hydrotalcite
  • Preparation method of pillared hydrotalcite

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specific Embodiment approach 1

[0009] Specific embodiment one: the pillared hydrotalcite of the present embodiment, the general molecular formula of hydrotalcite is: [M 2+ 1-x m 3+ x (OH) 2 ] x+ [A n- ] x / n ·zH 2 O, where the laminate body M 2+ for Mg 2+ 、Ni 2+ , Zn 2+ 、Co 2+ 、Cd 2+ 、Cu 2+ or Mn 2+ , laminate body M 3+ for Al 3+ , Fe 3+ 、Cr 3+ , Ga 3+ or Co 3+ , the interlayer anion A n- for WO 4 2- , B 4 o 7 2- , SiO 3 2- , (PO 3 ) 6 6- 、PO 4 3- 、C 6 h 5 SO 3 - 、C 2 o 4 2- 、C 4 h 4 o 6 2- 、C 6 h 5 o 7 3- or H 5 P(W 2 o 7 ) 8 2- ; 0.20≤x≤0.34, n is the interlayer anion A n- The number of charges, the value of crystal water z=1-3x / 2+d, where d=0.125.

[0010] The pillared hydrotalcite of this embodiment is surface-modified by introducing larger inorganic ions, organic anions and heteropolyacid ions to passivate the surface, which can effectively prevent the generation of hard agglomerates and improve The physical and chemical properties of its surface ca...

specific Embodiment approach 2

[0011] Embodiment 2: This embodiment differs from Embodiment 1 in that: 0.23≤x≤0.30. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: x=0.26. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses pillared hydrotalcite and a preparation method thereof, relates to hydrotalcite and a preparation method thereof, and solves the problems of easy agglomeration and long preparation time of the conventional pillared hydrotalcite. The structural formula of the pillared hydrotalcite is [M2+1-xM3+x(OH)2]x+[An-]x / n.zH2O, wherein M2+ and M3+ are laminar main body ions, An- is aninterlayer ion, x is more than or equal to 0.20 and less than or equal to 0.34, and z is the number of crystal water. The method comprises the following steps of: dripping aqueous solution of mixed salt containing M2+ and M3+ and aqueous solution of alkali sodium carbonate into the stirring water, and obtaining a bimetallic composite oxide by microwave crystallization and sintering; and preparingreduction solution from the bimetallic composite oxide, sodium hydroxide and soluble salt of the interlayer ion An-, and performing microwave crystallization and sintering on the reduction solution to obtain the pillared hydrotalcite. The pillared hydrotalcite of the invention is difficult to agglomerate, the exchange time of the interlayer negative ions is only 10 to 20 minutes, and the pillaredhydrotalcite can be used in the macromolecular flame-retardant field.

Description

technical field [0001] The present invention relates to the preparation method of hydrotalcite. Background technique [0002] Layered double hydroxides, also known as layered double hydroxides (LDHs for short), are composed of metal double hydroxides with a positively charged laminate body, anion guests are filled between the laminates, and host-guest passages Supramolecular force (electrostatic force and hydrogen bond) is a kind of lamellar crystal. This unique structure endows it with many special properties, such as alkalinity, acidity, thermal stability, memory effect, etc. These special properties make it a new type of inorganic functional material with great potential in adsorption, ion exchange, catalysis, and functional additives, and has attracted widespread attention. The interlayer anions of the existing pillared hydrotalcites are mostly inorganic anions, because the hydrotalcites contain -OH, which is easy to form hydrogen bonds, and then condenses to produce ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01B13/14C01G41/00
Inventor 陈春霞赵汉青彭进松许茸
Owner NORTHEAST FORESTRY UNIVERSITY
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