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Rod hydrotalcite-like compound and its prepn process

A hydrotalcite and rod-shaped technology, which is applied in the field of new morphology-rod-like hydrotalcite and its preparation, to achieve the effects of low cost, simple process and mild reaction

Inactive Publication Date: 2007-06-06
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiency that the existing preparation technology only obtains hexagonal flake-shaped particles with a single shape, the purpose of the present invention is to explore the use of a simple co-precipitation method to synthesize hydrotalcite-like particles with novel shapes under the induction of soft templates

Method used

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  • Rod hydrotalcite-like compound and its prepn process
  • Rod hydrotalcite-like compound and its prepn process
  • Rod hydrotalcite-like compound and its prepn process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Step a: Dissolve 3.83g (0.0125mol) of sodium stearate in 250ml of water and heat to 75°C.

[0047] Step b: 3.05g (0.015mol) of solid MgCl 2 .6H 2 O and 1.81 g (0.0075 mol) of solid AlCl 3 .6H 2O was dissolved in 45ml of water.

[0048] Step c: Dissolve 2.1g NaOH in 27ml water to prepare 2.0M alkaline solution.

[0049] Step d: After the solution in step a reaches a temperature of 75°C, add the solution in step b to the solution in step a to obtain a mixed solution;

[0050] Step e: Add the solution of step c to the above-mentioned mixed solution dropwise, stir, and control the pH range to 10. After the dropwise addition, age at 80°C for 18 hours, filter, wash with water until neutral, and age at 80°C for 24 hours, a rod-shaped magnesium-aluminum hydrotalcite material is obtained.

[0051] From the TEM results (Fig. 1 and Fig. 2), it can be seen that the morphology of the obtained material is rod-like, the average length of the rods is tens of microns, and the aver...

Embodiment 2

[0055] Step a: Dissolve 4.32g (0.015mol) of sodium lauryl sulfate in 150ml of water and heat to 60°C.

[0056] Step b: 8.91g (0.03mol) of solid Zn(NO 3 ) 2 .6H 2 O and 5.64g (0.015mol) of solid Al(NO 3 ) 3 .9H 2 O was dissolved in 40ml of water.

[0057] Step c: Dissolve 4.2g in 54ml of water to prepare a 2.0M alkaline solution.

[0058] Step d: After the solution of step a reaches the temperature of 75°C, simultaneously add the solution of step b and the solution of step c to the solution of step a dropwise, adjust the speed of both to complete the dropwise addition, and then adjust the pH range to 10.

[0059] Step e: aging the slurry obtained in step d at 70° C. for 18 hours, filtering, washing with water until neutral, and aging at 80° C. for 24 hours to obtain a rod-shaped zinc-aluminum hydrotalcite material.

Embodiment 3

[0061] Step a: Dissolve 4.32g (0.015mol) of sodium lauryl sulfate in 150ml of water and heat to 65°C.

[0062] Step b: 6.10 g (0.03 mol) of solid MgCl 2 .6H 2 O and 4.05 g (0.015 mol) of solid FeCl 3 .6H 2 O was dissolved in 40ml of water.

[0063] Step c: Dissolve 4.2g in 54ml of water to prepare a 2.0M alkaline solution.

[0064] Step d: After the solution of step a reaches the temperature of 75°C, simultaneously add the solution of step b and step c to the solution of step a dropwise, adjust the speed of both to complete the dropwise addition, and then adjust the pH range to 10.5.

[0065] Step e: aging the slurry obtained in step d at 65° C. for 18 hours, filtering, washing with water until neutral, and aging at 80° C. for 26 hours to obtain a rod-shaped mafic-iron hydrotalcite material.

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Abstract

The present invention discloses rod-shaped magnesia alumina hydrotalcite-like compound (HTlc) as one new shaped hydrotalcite-like compound. The rod-shaped magnesia alumina hydrotalcite-like compound has the crystal structure of hydrotalcite and chemical expression of [MII(1-x)MIIIx(OH)2]x+[An-x / n]x-mH2O, where, MII and MIII are bivalent and trivalent metal cation separately, An- is interlayer anion, x is the molar fraction of MIII in HTlc, m is the molar fraction of interlayer crystalline water. It is prepared through a traditional co-precipitation process under the induction of soft template or shape regulating agent sodium stearate. It has simple preparation process and low cost, and may be used as rubber and plastic additive, fire retardant, pesticide release controlling agent, etc.

Description

technical field [0001] The invention belongs to the technical field of inorganic layered materials, and in particular relates to a new shape-rod-like hydrotalcite and a preparation method thereof. Background technique [0002] The morphology of particles is closely related to their physical and chemical properties, so morphology control has become a key technology in the preparation of powder materials. [0003] Hydrotalcite-like compounds (HTlc for short) are also known as layered double hydroxides (LDHs for short), and their general structural formula is: [M II (1-x) m III x (OH) 2 ] x+ [A n- x / n ] x- mH 2 O, where M II and M III refer to divalent and trivalent metal cations, respectively, A n- is the interlayer anion, x is M in each mole of HTlc III The mole fraction of , m is the number of moles of interlayer crystallization water per mole of HTlc. [0004] Hydrotalcite-like has a brucite sheet structure, and the laminates are positively charged due to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G1/00B01J20/06B01J21/00B01J23/00B01J32/00
Inventor 侯万国刘春霞
Owner SHANDONG UNIV
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