CN1923355A - Method for preparing nano hollow inorganic microsphere - Google Patents
Method for preparing nano hollow inorganic microsphere Download PDFInfo
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- CN1923355A CN1923355A CNA200510029273XA CN200510029273A CN1923355A CN 1923355 A CN1923355 A CN 1923355A CN A200510029273X A CNA200510029273X A CN A200510029273XA CN 200510029273 A CN200510029273 A CN 200510029273A CN 1923355 A CN1923355 A CN 1923355A
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- emulsifying agent
- silane
- inorganic
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Abstract
The invention relates to a method for preparing nanometer hollow inorganic microball. Wherein, it uses special silane emulsion to form micro emulsion, uses inorganic silane to absorb, hydrolyze, polycondensate, and treat at oil/water interface, to paper nanometer hollow inorganic microball with certain thickness and strength. The invention uses micro emulsion to obtain the hollow inorganic microball with controllable size and thickness. And the can avoid solvent dissolution or sinter. And the invention has simple process and adjustable size and thickness.
Description
Technical field
The present invention is the relevant method for preparing the hollow nano inorganic microsphere, by the method for microemulsion, at the interface of oil/water hydrolysis, polycondensation reaction takes place more precisely, prepares the method for the hollow nano microballoon with certain shell thickness and intensity.
Background technology
The hollow inorganic microballoon receives great concern in recent years, its reason is to compare with organic hollow microsphere, the inorganic microsphere of hollow has very high heat, light, electricity, machinery and stability sour, alkali, at the controlled transportation and the delivery systme that are widely used in medicine, dyestuff, cosmetics, sensitiveness reagent such as enzyme and protein etc. as microencapsulation material, also can be used as the filler of lightweight, high selection type catalyst or catalyst carrier, and also have extremely important value at aspects such as artificial cell, medicals diagnosis on disease.
Up to now, the hollow of bibliographical information has much for trying to achieve the preparation method, mainly is template.This method is to utilize polymer microballoon such as polystyrene microsphere to be template, this microsphere surface has positive charge, the precursor that can adsorb inorganic oxide, surface at microballoon is hydrolyzed, polycondensation, the gel that the formation inorganic oxide is, calcination by muffle furnace then, or dissolve the nuclear of polymer microballoon, thus can obtain the hollow microsphere of inorganic polymer.Though this method can successfully prepare hollow microsphere, step is various, and reunites easily in the calcination process simultaneously, and its application prospect is subjected to certain limitation, and this method also is difficult to carry out large-scale production.
Emulsion is a two-phase system, mainly contains oil/water (O/W) system and water/oil (W/O) system.Because the two-phase nature difference is bigger, has many these two-phase interfaces that are reflected to carry out.By what emulsion method prepared hollow microsphere bibliographical information being arranged also, is matrix but these microballoons mostly are organic polymer greatly.For example, recently people such as Qunhui Sun " Journal of American Chemical Society " 2005 the 127th volumes the 23rd phase 8274-8275 page or leaf reported method by inverse emulsion polymerization in the two-phase interface prepared in reaction poly-(N-N-isopropylacrylamide) (PNIPAM) microballoon of hollow.
Also occurred preparing by the method for emulsion the report of inorganic hollow microballoon recently, for example people such as Masahiro Fujiwara has reported the hollow microsphere that has prepared silica by the interfacial reaction of water/oil/aqueous emulsion at " Chemistry of Materials " the 16th phase 5420-5426 page or leaf in 2004.This method is to utilize sodium metasilicate and suitable precipitating reagent to obtain silica in the interfacial reaction of two-phase.People such as RoyaleS.Underhill have reported that at " Chemistry of Materials " the 14th phase 4919-4926 in 2002 with neutral emulsifying agent Brij97 be emulsifying agent, are that decentralized photo, normal heptane are the reverse micro emulsion that continuous phase has formed water/oil type with water.Hydrolysis takes place at water/oily interface in octadecyl trimethoxy silane and ethyl orthosilicate, thereby polycondensation reaction forms nano level silica hollow microsphere.
Though these preparation methods can both prepare inorganic hollow microsphere, the hollow microsphere diameter that people's such as Masahiro Fujiwara method obtains big (5～20um), be difficult to the hollow microsphere that the preparation nanoscale disperses.People's such as Royale S.Underhill method is the neutral emulsifying agent that gets owing to what use, and octadecyl trimethoxy silane and ethyl orthosilicate all are oil-soluble presomas, be difficult in oil/water termination preceding picked absorption and hydrolysis takes place, therefore, be adsorbed on the presoma limited amount of oil/water termination, presoma still in oil phase, therefore obtains the silica hollow Nano microsphere of certain shell thickness and intensity very much mostly.
Summary of the invention
The purpose of this invention is to provide a kind of easy, method that can scale preparation hollow nano inorganic microsphere, to overcome the defective that prior art exists.
Technical conceive of the present invention is such:
The microemulsion that the present invention utilizes a kind of special silane emulsifying agent to form utilizes the absorption of inorganic matter presoma in oil/water termination, hydrolysis, polycondensation and post processing, the hollow nano inorganic microsphere that preparation has certain shell thickness and intensity.
Method of the present invention comprises the steps:
With emulsifiers dissolve in water, under agitation, the oil phase that is dissolved with the inorganic matter presoma is added in the above-mentioned aqueous solution, obtains the positive microemulsion, make most inorganic matter presomas be adsorbed on oil/aqueous phase interface, hydrolysis condensation reaction under 20～95 ℃ temperature, the hydrolytie polycondensation time is 6～90 hours, also can add catalyst during hydrolytie polycondensation, and slaking is 1～72 hour then, vacuum drying then can obtain the nanometer titanium dioxide micro-sphere of hollow.Particle diameter is 10～500 nanometers.
Part by weight is:
Water: oil phase: emulsifying agent=60～98: 2～40: 2～40.
Said oil phase is selected from the organic liquid immiscible with water, preferred alkane such as normal heptane, kerosene, hydrogenated kerosene, diesel oil, benzene, toluene or dimethylbenzene etc.;
The inorganic matter presoma is selected from ethyl orthosilicate, tetrabutyl titanate, isopropyl titanate etc.
Said catalyst be selected from organic or inorganic acid as: hydrochloric acid, acetic acid, oxalic acid etc. or organic or inorganic alkali such as ammoniacal liquor, triethylamine, pyridine etc., addition is 0.001～5% of an inorganic matter presoma weight;
Said emulsifying agent is selected from silane emulsifying agent or silane emulsifying agent and other common cations, the mixture of nonionic or anion emulsifier;
The silane emulsifying agent comprises the silane emulsifying agent of cationic silicon alkane emulsifying agent, nonionic silane emulsifying agent or anionic;
Cationic silane emulsifying agent structure is as follows:
R(3-n)Xn?Si?R′N
+R
2″RY
+
In the formula: n=1～3; R is CH
3-, CH
3CH
2-or phenyl;
X is a halogen atom, as Cl, and Br, the alkoxyl of I, C1～C4, acyloxy are as CH
3COO or CH
3CH
2COO etc.;
R ' is-(CH
2)
2～8
R " is CH
3(CH
2)
0～8-;
R is (CH
2)
1～30Z, wherein Z is-CH
3,-OH ,-SH or-CH=CH
2Deng functional group;
Y is a halogen atom, as Cl, and Br, I;
Or cationic silane emulsifying agent structure is as follows:
R(3-n)XnSiCH
2CHR′COZ(CH
2)m?N+R
2″RY
In the formula: n=1～3;
R is CH
3-or CH
3CH
2-etc.;
X is halogen atom such as Cl, Br, the alkoxyl of I, C1～C4, acyloxy such as CH
3COO or CH
3CH
2COO etc.;
R ' is H or CH
3(CH
2)
0～8Deng;
Z is O or NH etc.;
m＝1～10；
R " is CH
3(CH
2)
0～8-;
R is (CH
2)
1～30Z; Wherein Z is CH
3Or-OH, functional groups such as-SH;
Y is halogen atom such as Cl, Br, I etc.
In use, cationic silane emulsifying agent is not limited only to the described compound of above structure, and the cationic silane compound of other structures is available too, the cationic silane compound or the similar structures of following structure:
Or be:
R(3-n)XnSi(CH
2)m(CH
2CH
2O)
lY
The structure of nonionic silane emulsifying agent is as follows:
In the formula: n=1～3, m=1～10, l=1～40;
R is CH
3-or CH
3CH
2-;
X is halogen atom such as Cl, Br, the alkoxyl of I, C1～C4 or acyloxy acyloxy such as CH
3COO, CH
3CH
2COO etc.;
Y is H, CH
3, CH
3CH
2Deng.
Or the structure of nonionic silane emulsifying agent is as follows:
R(3-n)XnSiCH
2CHZCOO(CH
2CH
2O)
lY
In the formula: n=1～3; L=1～40;
R is CH
3-or CH
3CH
2-etc.;
X is halogen atom such as Cl, Br, the alkoxyl of I, C1～C4 or acyloxy acyloxy such as CH
3COO, CH
3CH
2COO etc.;
Z is H, CH
3(CH
2)
0～8Deng;
Y is H, CH
3, CH
3CH
2Deng.
The structure of anion silane emulsifying agent is as follows:
R(3-n)XnSi(CH
2)mYM
+
Or be:
In the formula: n=1～3; M=3～36
R is CH
3-or CH
3CH
2-etc.;
X is halogen atom such as Cl, Br, the alkoxyl of I, C1～C4 or acyloxy acyloxy such as CH
3COO, CH
3CH
2COO etc.;
Y is SO
3 -, COO
-, SO
4 2-Deng group;
M is NH4
+, Na
+, K
+, Li
+, Mg
2+Deng cation.
Said silane emulsifying agent can adopt the laboratory synthetic method to be prepared, or adopts the commercially available prod, as the product B rij97 of Aldrich Chemical Co. company production.
The cation emulsified C that is selected from that other are common
3～C
36Long chain alkyl ammonium salt or C
3～C
36Chain alkyl quaternary alkylphosphonium salt etc.;
Other common nonionic emulsifier kinds are a lot, mainly are some low PEOs, the ester of the oligomer of oxirane and expoxy propane copolymerization or ether etc., and the commercial product of this class mainly contains the soil temperature class, spans etc.;
Other common anion emulsifiers are selected from C
3～C
36Sulfate, sulfonate or the carboxylate etc. of chain alkyl, as the sour sodium of dodecyl sulphur (sulphur), the sour sodium of detergent alkylate sulphur (sulphur), potassium or ammonia etc.;
The present invention can be according to the weight concentration that is dissolved in the inorganic matter presoma in the oil phase, control the thickness of the hollow microsphere shell that will prepare, when needs preparations thicker the hollow microsphere shell time, can improve the weight concentration of the inorganic matter presoma in the oil phase, otherwise, then reduce concentration, preferred weight concentration is 0.5～10%.
The present invention can be according to the ratio of oil phase/water/emulsifying agent, the size of control microballoon, and preferred part by weight is:
Oil phase: water: emulsifying agent=60～98: 2～40: 2～40.
The present invention in the mechanism of preparation hollow inorganic microballoon is, silane emulsifying agent itself is arranged, or silane emulsifying agent and other emulsifying agents share the stability with good microemulsion, silane emulsifying agent itself can hydrolysis, form silicon hydroxyl (Si-OH) in oil/water termination, thereby this group runs into the inorganic matter presoma generation polycondensation that is dissolved in the oil phase and attracts more inorganic matter presoma at the interface, by the diffusion of hydrone at the interface, thus constantly the thickening ever that causes oil/water termination.Another mechanism of the cationic silane emulsifying agent that the present invention uses is that the electropositive of silane can effectively be adsorbed the inorganic matter presoma, can better obtain the controlled inorganic hollow microballoon of shell thickness in conjunction with above-mentioned mechanism simultaneously.
Characteristics of the present invention are that one step of method by microemulsion directly obtains particle size, the controlled hollow inorganic microballoon of shell thickness.Avoided needing at first synthetic polymer microsphere template by template.Because polymer template absorption inorganic matter presoma is limited in one's ability, the thickness of the inorganic matter shell of feasible absorption is little, and the intensity of the hollow microsphere that obtains is low.The need of having save polymer template simultaneously by the method for dissolution with solvents or calcination remove loaded down with trivial details.Therefore, the present invention prepares the hollow inorganic microballoon to have simply, is easy to do, and particle size and the adjustable advantage of shell thickness.
Below in conjunction with specific embodiment method involved in the present invention and technology are described, in following examples, the form that the structure of used silane emulsifying agent is seen below.
The specific embodiment
Among the embodiment,, be weight portion as not specified.
Embodiment 1
10 parts of anionic silane emulsifying agents (close at chlordene by trimethoxy silane and 1-ethene undecanoic acid sodium under the catalysis of platinic acid 90 ℃ make by the silicon addition reaction) are dissolved in 100 parts of water, under vigorous stirring, 15 parts the cyclohexanes that are dissolved with 10 parts of ethyl orthosilicates slowly are added drop-wise in the above-mentioned aqueous solution, up to forming with the translucent positive microemulsion that has little blueness, at room temperature continue then to stir 2 days, slaking is 12 hours then, filter, can obtain the nano silica microsphere of hollow 80 ℃ of vacuum drying in 24 hours.The average grain diameter of silane emulsifying agent and gained hollow microsphere sees Table 1.
Embodiment 2
With 4 parts of cationic silane emulsifying agents-3 (available from Aldrich company, chemical name: 3-(Trimethoxysilyl) propyl) octadecyldimethylammonium chloride) and 6 parts of CTABs be dissolved in 100 parts of water, under vigorous stirring, 15 parts the normal heptanes that are dissolved with 10 parts of tetrabutyl titanates slowly are added drop-wise in the above-mentioned aqueous solution, up to forming with the translucent positive microemulsion that has little blueness, at room temperature continue then to stir 2 days, slaking is 24 hours then, filter, can obtain the nanometer titanium dioxide micro-sphere of hollow 80 ℃ of vacuum drying in 24 hours.The average grain diameter of silane emulsifying agent and gained hollow microsphere sees Table 1.
Embodiment 3
4 parts of neutral silane emulsifying agents (trimethoxy silane and methacrylic acid undecyl methoxypolyethylene glycol ester close at chlordene under the catalysis of platinic acid and make by the silicon addition reaction at 120 ℃) and 6 parts of neutral emulsifying agent Brij97 (Aldrich Chemical Co.) are dissolved in 100 parts of water, under vigorous stirring, 15 parts the normal heptanes that are dissolved with 10 parts of ethyl orthosilicates slowly are added drop-wise in the above-mentioned aqueous solution, up to forming with the translucent positive microemulsion that has little blueness, at room temperature continue then to stir 2 days, slaking is 12 hours then, filter, can obtain the nano silica microsphere of hollow 80 ℃ of vacuum drying in 24 hours.The average grain diameter of silane emulsifying agent and gained hollow microsphere sees Table 1.
Subordinate list 1
Claims (6)
1. a method for preparing the hollow nano inorganic microsphere is characterized in that, comprises the steps:
Emulsifiers dissolve in water, under agitation, is added to the oil phase that is dissolved with an amount of inorganic precursor in the above-mentioned aqueous solution, obtain the positive microemulsion, after microemulsion is stable, splash into proper catalyst then, and keep stirring, impel presoma in two-phase interface generation hydrolysis, polycondensation reaction.Hydrolysis condensation reaction under 20～95 ℃ temperature, the hydrolytie polycondensation time is 6～90 hours, also can add catalyst during hydrolytie polycondensation, slaking is 1～72 hour then, filters, vacuum drying then, can obtain the inorganic matter microballoons such as nano titanium oxide of hollow;
Said oil phase is selected from the organic liquid immiscible with water;
Said emulsifying agent is selected from silane emulsifying agent or silane emulsifying agent and other common cations, the mixture of nonionic or anion emulsifier.
2. method according to claim 1 is characterized in that said oil phase is selected from normal heptane, kerosene, hydrogenated kerosene, diesel oil, benzene, toluene or dimethylbenzene.
3. method according to claim 1, it is characterized in that, add catalyst during hydrolytie polycondensation, said catalyst be selected from organic or inorganic acid as: hydrochloric acid, acetic acid, oxalic acid etc. or organic or inorganic alkali, addition is 0.001～5% of an inorganic matter presoma weight.
4. method according to claim 1 is characterized in that, it is the inorganic precursor of inorganic matter that the inorganic matter presoma is selected from ethyl orthosilicate, tetrabutyl titanate, isopropyl titanate or other hydrolyzable.
5. method according to claim 1 is characterized in that, the silane emulsifying agent comprises the silane emulsifying agent of cationic silicon alkane emulsifying agent, nonionic silane emulsifying agent or anionic;
Cationic silane emulsifying agent structure is as follows:
R
(3-n)X
nSiR′N
+R
2″RY
-
In the formula: n=1～3; R is CH
3-, CH
3CH
2-or phenyl;
X is alkoxyl, the acyloxy of halogen atom, C1～C4;
R ' is-(CH
2)
2～8
R " is CH
3(CH
2)
0～8-;
R is (CH
2)
1～30Z, wherein Z is-CH
3,-OH ,-SH or-CH=CH
2
Y is a halogen atom;
Or cationic silane emulsifying agent structure is as follows:
R
(3-n)X
nSiCH
2CHR′COZ(CH
2)
mN
+R
2″RY
In the formula: n=1～3;
R is CH
3-or CH
3CH
2-;
X is alkoxyl, the acyloxy of halogen atom, C1～C4;
R ' is H or CH
3(CH
2)
0～8
Z is O or NH;
m＝1～10；
R " is CH
3(CH
2)
0～8-;
R is (CH
2)
1～30Z; Wherein Z is CH
3Or-OH ,-SH;
Y is a halogen atom;
Or the cationic silane compound or the similar structures of following structure:
Or be:
R
(3-n)X
nSi(CH
2)
m(CH
2CH
2O)
lY
The structure of nonionic silane emulsifying agent is as follows:
In the formula: n=1～3, m=1～10, l=1～40;
R is CH
3-or CH
3CH
2-;
X is alkoxyl or the acyloxy acyloxy of halogen atom, C1～C4;
Y is H, CH
3, CH
3CH
2
Or the structure of nonionic silane emulsifying agent is as follows:
R
(3-n)X
nSiCH
2CHZCOO(CH
2CH
2O)
lY
In the formula: n=1～3; L=1～40;
R is CH
3-or CH
3CH
2-;
X is halogen atom such as Cl, Br, the alkoxyl of I, C1～C4 or acyloxy acyloxy;
Z is H, CH
3(CH
2)
0～8
Y is H, CH
3, CH
3CH
2
The structure of anion silane emulsifying agent is as follows:
R
(3-n)X
nSi(CH
2)
mYM
+
Or be:
In the formula: n=1～3; M=3～36
R is CH
3-or CH
3CH
2-etc.;
X is halogen atom such as Cl, Br, the alkoxyl of I, C1～C4 or acyloxy acyloxy such as CH
3COO, CH
3CH
2COO etc.;
Y is SO
3 -, COO
-, SO
4 2-Deng group;
M is NH4
+, Na
+, K
+, Li
+, Mg
2+Deng cation.
The cation emulsified C that is selected from that other are common
3～C
36Long chain alkyl ammonium salt or C
3～C
36The chain alkyl quaternary alkylphosphonium salt;
Other common nonionic emulsifiers are selected from the ester or the ether of the oligomer of low PEO or oxirane and expoxy propane copolymerization;
Other common anion emulsifiers are selected from C
3～C
36Sulfate, sulfonate or the carboxylate of chain alkyl.
6. according to each described method of claim 1～5, it is characterized in that the weight concentration of the inorganic matter presoma in the oil phase is 0.5～10%, oil phase: water: emulsifying agent=60～98: 2～40: 2～40, weight ratio.
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Family Cites Families (5)
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| WO2003086609A1 (en) * | 2002-04-05 | 2003-10-23 | University Of Florida | Oil-filled nanocapsules from microemulsions utilizing cross-linkable surfactants |
| JP2004310050A (en) * | 2003-03-26 | 2004-11-04 | Daicel Chem Ind Ltd | Microcapsule and its producing method |
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