CN1974399A - Rod hydrotalcite-like compound and its prepn process - Google Patents
Rod hydrotalcite-like compound and its prepn process Download PDFInfo
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- CN1974399A CN1974399A CN 200610070349 CN200610070349A CN1974399A CN 1974399 A CN1974399 A CN 1974399A CN 200610070349 CN200610070349 CN 200610070349 CN 200610070349 A CN200610070349 A CN 200610070349A CN 1974399 A CN1974399 A CN 1974399A
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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
The invention belongs to the inorganic lamellar material technical field, relate in particular to a kind of novel pattern-rod hydrotalcite-like compound and preparation method thereof.
Background technology
The pattern of particle and its physicochemical property are of close concern to each other, so the pattern regulation and control become a gordian technique of powder body material preparation process.
Houghite (Hydrotalcite-like compounds is abbreviated as HTlc) is called layered double hydroxide (Layered double hydroxides is abbreviated as LDHs) again, and its general structure is: [M
II (1-x)M
III x(OH)
2]
X+[A
N- X/n]
X-MH
2O, M in the formula
IIAnd M
IIIRefer to divalence and trivalent metal cation respectively, A
N-Be interlayer anion, x is M among every mole of HTlc
IIIMolar fraction, m is the mole number of interlayer crystal water among every mole of HTlc.
Houghite has the brucite laminated structure, and laminate is because trivalent metal ion isomorphous substitution divalent-metal ion and band structure positive charge, and interlayer exists tradable object negatively charged ion and laminate positive charge to balance each other.In recent years, houghite has caused people's extensive interest, because the structure of HTlc and performance have determined it that potential widely using value is arranged in the industrial and agricultural production field, as anionite, transmitter, ceramic forerunner, sorbent material, catalyzer and support of the catalyst, sewage-treating agent and farm chemical carrier etc., particularly recently HTlc enjoys people's attention as the inorganic carrier of range gene and drug molecule.
Coprecipitation method is the most popular method of synthesis hydrotalcite-like material, and the houghite that obtains is hexagonal plate, and single pattern will certainly limit its range of application; How its pattern is regulated and control, synthesized houghite, develop its new purposes, become one of research focus with novel pattern.
Summary of the invention
Have to the deficiency of hexagonal plate single shape particle at having technology of preparing now, the objective of the invention is to explore simple coprecipitation method, under the inducing of soft template, synthesize houghite with novel pattern.
Technical scheme of the present invention is to adopt traditional coprecipitation method, adds a certain amount of pattern adjusting control agent in precipitation process, obtains rod hydrotalcite-like compound.
Rod hydrotalcite-like compound of the present invention is characterized in that: have the crystalline structure of hydrotalcite, the chemical constitution general formula is:
[M
II (1-x)M
III x(OH)
2]
x+[A
n- x/n]
x-.mH
2O
Wherein: M
IIBe Mg
2+, Mn
2+, Fe
2+, Co
2+, N
2+, Cu
2+, Zn
2+, Ca
2+One of; M
IIIBe Al
3+, Cr
3+, Mn
3+, Fe
3+, Co
3+, Ni
3+, La
3+One of; A
N-Be CO
3 2-, SO
4 2-, Cl
-, NO
3 -, inorganic anion, organic anion it.
Preferred version is: described M
IIBe Mg
2+, Zn
2+One of; Described M
IIIBe Al
3+, Fe
3+One of.
The preparation method of above-mentioned rod hydrotalcite-like compound is characterized in that: adopt traditional coprecipitation method, synthesize rod hydrotalcite-like compound under soft template or pattern adjusting control agent are induced.
Wherein: described soft template or pattern adjusting control agent are tensio-active agent, inner complex or polymer substance, specifically are selected from one of following or its combination:
Sodium lauryl sulphate, sodium stearate, Sodium dodecylbenzene sulfonate, sodium tartrate, disodium EDTA (EDTA), trimethyl-glycine, partially hydrolyzed polyacrylamide, polyvinyl alcohol and modification derivant thereof, polyoxyethylene glycol.
Wherein: described pattern adjusting control agent preferably sodium dodecyl sulfate, sodium stearate.
The preparation method of rod hydrotalcite-like compound of the present invention, concrete steps are:
A. compound concentration is the pattern adjusting control agent solution of 0.1M～0.8M, and heating is controlled between 60 ℃～75 ℃ temperature;
B. prepare solubility divalent metal muriate and the muriatic mixing salt solution of solubility trivalent metal, divalence and trivalent metal ion mol ratio are 2-4: 1;
C. compound concentration is the alkaline solution of the NaOH of 1.0-3.0M;
D. after treating that step a solution reaches design temperature, step b solution is joined in the step a solution, obtain mixing solutions;
E. thereafter step c drips of solution is added in the above-mentioned mixing solutions; Perhaps step b and step c solution are added dropwise in the step a solution simultaneously; Stir and control pH scope is 9-11, drip finish after, 60 ℃～80 ℃ aging 3-24 hour, filter, water washing is to neutral, 80 ℃ of ageings 24～28 hours obtain rod hydrotalcite-like compound.
In stating the preparation method of rod hydrotalcite-like compound: the described divalent-metal ion of step b is preferably Mg
2+, Zn
2+One of; Described trivalent metal ion is preferably Al
3+, Fe
3+One of; Divalence and trivalent metal ion mol ratio are preferably 2: 1.
Be example with pattern adjusting control agent sodium stearate below, specifically narrate the preparation method of bar-shaped magnesia-alumina hydrotalcite:
A. compound concentration is 0.4M～0.6M sodium stearate solution, and heating is controlled between 60 ℃～75 ℃ temperature;
B. with Mg
2+/ Al
3+Mol ratio is 2: 1 ratio preparation MgCl
2With AlCl
3Mixing salt solution;
C. compound concentration is the NaOH solution of 2.0M;
D. after treating that step a solution reaches design temperature, step b solution is joined in the step a solution, obtain mixing solutions;
E. thereafter step c drips of solution is added in the mixing solutions of d, stirs and control pH scope is 9-11, drip finish after, 60 ℃～80 ℃ aging 3-18 hour, filter, water washing is to neutral, 80 ℃ of ageings 24～28 hours obtain bar-shaped magnesia-alumina hydrotalcite.
Among the preparation method of above-mentioned bar-shaped magnesia-alumina hydrotalcite: the preferred 0.5M of described sodium stearate solution concentration.
Among the preparation method of above-mentioned bar-shaped magnesia-alumina hydrotalcite: described sodium stearate solution Heating temperature preferably is controlled at 75 ℃.
Among the preparation method of above-mentioned bar-shaped magnesia-alumina hydrotalcite: the described pH of step e is preferably 10.
Among the preparation method of above-mentioned bar-shaped magnesia-alumina hydrotalcite: preferably 80 ℃ of the described aging temperatures of step e; Digestion time preferably 18 hours.
Among the preparation method of above-mentioned bar-shaped magnesia-alumina hydrotalcite: the described digestion time of step e preferably 24 hours.
The bar-shaped magnesia-alumina hydrotalcite that preparation method of the present invention is obtained carries out XRD, IR, elemental analysis shows, hydrotalcite layers is the stearate radical negatively charged ion.
Above-mentioned magnesia-alumina hydrotalcite is carried out TEM characterize, its pattern is bar-shaped, and the mean length of rod is tens microns, and mean diameter is tens to hundreds of nanometers.
The outstanding advantage that the present invention had is:
1. synthesize bar-shaped houghite.
2. the preparation method's technology that is adopted is simple, and cost is low, reaction temperature and.
The rod hydrotalcite-like compound of the inventive method gained rubber plastic additive, fire retardant, pesticide action-controlling system and
Fields such as oil-field development have important use to be worth.
Description of drawings
Fig. 1 be the bar-shaped magnesia-alumina hydrotalcite of embodiment 1 preparation TEM result (* 5.80K).
Fig. 2 be the bar-shaped magnesia-alumina hydrotalcite of embodiment 1 preparation TEM result (* 29.0K).
Fig. 3 is the X-ray powder diffraction figure of the bar-shaped magnesia-alumina hydrotalcite of embodiment 1 preparation.
Fig. 4 is the infrared spectrum of the bar-shaped magnesia-alumina hydrotalcite of embodiment 1 preparation.Have in addition simultaneously sodium stearate and interlayer anion be chlorion the magnesia-alumina hydrotalcite infrared spectrum as a comparison.
Embodiment
Embodiment 1
Step a: the sodium stearate of 3.83g (0.0125mol) is dissolved in the 250ml water, is heated to 75 ℃.
Step b: with the solid MgCl of 3.05g (0.015mol)
2.6H
2The solid AlCl of O and 1.81g (0.0075mol)
3.6H
2O is dissolved in the 45ml water.
Step c: 2.1gNaOH is dissolved in the alkaline solution that is made into 2.0M in the 27ml water.
Steps d: after treating that step a solution reaches 75 ℃ of temperature, step b solution joined in the step a solution obtain mixing solutions;
Step e: step c drips of solution is added in the above-mentioned mixing solutions thereafter, stir, control pH scope is 10, drip finish after, 80 ℃ aging 18 hours, filter, water washing is to neutral, 80 ℃ of ageings 24 hours obtain bar-shaped magnesia-alumina hydrotalcite material.
By TEM result (Fig. 1, Fig. 2) as can be known, the pattern of material be bar-shaped, the mean length of rod is tens microns, mean diameter is tens to hundreds of nanometers.
Show that by XRD spectra (Fig. 3), IR spectrogram (Fig. 4) and ultimate analysis hydrotalcite layers is the stearate radical negatively charged ion, its chemical formula consists of:
[Mg
0.70Al
0.30(OH)
2(C
17H
35COO
-)
0.82]Na
0.52。
Step a: the sodium lauryl sulphate of 4.32g (0.015mol) is dissolved in the 150ml water, is heated to 60 ℃.
Step b: with the solid Zn (NO of 8.91g (0.03mol)
3)
2.6H
2Solid Al (the NO of O and 5.64g (0.015mol)
3)
3.9H
2O is dissolved in the 40ml water.
Step c: 4.2g is dissolved in the alkaline solution that is made into 2.0M in the 54ml water.
Steps d: after treating that step a solution reaches 75 ℃ of temperature, simultaneously step b solution and step c solution dropwise are added in the step a solution simultaneously, the speed of reconciling both dropwises simultaneously, and regulating its pH scope then is 10.
Step e: with steps d gained slurries 70 ℃ aging 18 hours, filter, water washing is to neutral, 80 ℃ of ageings 24 hours obtain bar-shaped zinc-aluminum gavite material.
Embodiment 3
Step a: the sodium lauryl sulphate of 4.32g (0.015mol) is dissolved in the 150ml water, is heated to 65 ℃.
Step b: with the solid MgCl of 6.10g (0.03mol)
2.6H
2The solid FeCl of O and 4.05g (0.015mol)
3.6H
2O is dissolved in the 40ml water.
Step c: 4.2g is dissolved in the alkaline solution that is made into 2.0M in the 54ml water.
Steps d: after treating that step a solution reaches 75 ℃ of temperature, simultaneously step b solution and step c solution dropwise are added in the step a solution simultaneously, the speed of reconciling both dropwises simultaneously, and regulating its pH scope then is 10.5.
Step e: with steps d gained slurries 65 ℃ aging 18 hours, filter, water washing is to neutral, 80 ℃ of ageings 26 hours obtain bar-shaped magnesium iron houghite material.
Claims (10)
1. rod hydrotalcite-like compound, it is characterized in that: crystalline structure is the crystalline structure of hydrotalcite, and chemical formula is: [M
II (1-x)M
III x(OH)
2]
X+[A
N- X/n]
X-MH
2O; Wherein, MII is Mg
2+, Mn
2+, Fe
2+, Co
2+, Ni
2+, Cu
2+, Zn
2+, Ca
2+One of; MIII is Al
3+, Cr
3+, Mn
3+, Fe
3+, Co
3+, Ni
3+, La
3+One of; A
N-Be CO
3 2-, SO
4 2-, Cl
-, NO
3 -, one of inorganic anion, organic anion.
2. according to the described rod hydrotalcite-like compound of claim 1, it is characterized in that: described MII is Mg
2+, Zn
2+One of; Described M
IIIBe Al
3+, Fe
3+One of.
3. the preparation method of the described rod hydrotalcite-like compound of claim 1 is characterized in that: adopt traditional coprecipitation method, synthesize rod hydrotalcite-like compound under soft template or pattern adjusting control agent are induced.
4. according to the preparation method of the described rod hydrotalcite-like compound of claim 3, it is characterized in that: described soft template or pattern adjusting control agent are tensio-active agent, inner complex or polymer substance, specifically are selected from one of following or its combination:
Sodium lauryl sulphate, sodium stearate, Sodium dodecylbenzene sulfonate, sodium tartrate, disodium EDTA (EDTA), trimethyl-glycine, partially hydrolyzed polyacrylamide, polyvinyl alcohol and modification derivant thereof, polyoxyethylene glycol.
5. according to the preparation method of the described rod hydrotalcite-like compound of claim 4, it is characterized in that: described pattern adjusting control agent preferably sodium dodecyl sulfate, sodium stearate.
6. according to the preparation method of the described rod hydrotalcite-like compound of claim 3, step is:
A. compound concentration is the pattern adjusting control agent solution of 0.1M～0.8M, and heating is controlled between 60 ℃～75 ℃ temperature;
B. prepare solubility divalent metal muriate and the muriatic mixing salt solution of solubility trivalent metal, divalence and trivalent metal ion mol ratio are 2-4: 1;
C. compound concentration is the alkaline solution of the NaOH of 1.0-3.0M;
D. after treating that step a solution reaches design temperature, step b solution is joined in the step a solution, obtain mixing solutions;
E. thereafter step c drips of solution is added in the above-mentioned mixing solutions; Perhaps step b and step c solution are added dropwise in the step a solution simultaneously; Stir and control pH scope is 9-11, drip finish after, 60 ℃～80 ℃ aging 3-24 hour, filter, water washing is to neutral, 80 ℃ of ageings 24～28 hours obtain rod hydrotalcite-like compound.
7. according to the preparation method of the described rod hydrotalcite-like compound of claim 6, it is characterized in that: the described divalent-metal ion of step b is Mg
2+, Zn
2+One of; Described trivalent metal ion is Al
3+, Fe
3+One of; Divalence and trivalent metal ion mol ratio are 2: 1.
8. according to the preparation method of the described rod hydrotalcite-like compound of claim 6, it is characterized in that: the described pH of step e is 10.
9. according to the preparation method of the described rod hydrotalcite-like compound of claim 6, it is characterized in that: the described aging temperature of step e is 80 ℃; Digestion time is 18 hours.
10. according to the preparation method of the described rod hydrotalcite-like compound of claim 6, it is characterized in that: the described digestion time of step e is 24 hours.
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| US5075089A (en) * | 1990-03-20 | 1991-12-24 | Aluminum Company Of America | Method of making pillared hydrotalcites and associated products |
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| CN100542966C (en) | 2009-09-23 |
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