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Method for fixing metal oxide by using polyurea microcapsule

A technology of oxides and microcapsules, which is applied in the direction of microcapsule preparations, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high preparation costs, unseen metal oxide-containing polyurea microcapsules, and microcapsule breakage rate and the size is difficult to control, etc., to achieve the effect of simple preparation method, stable activity and low equipment requirements

Inactive Publication Date: 2008-08-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method still needs two steps just to form microcapsules, and needs to use expensive polymer containing cyanide bond and other types of polymers, the preparation cost is higher, and the breakage rate and size of prepared microcapsules are difficult to control (Ley, S.V., et al, Org. Lett. 2003, 5, 185)
So far, there have been no reports of one-step preparation of polyurea microcapsules containing metal oxides.

Method used

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  • Method for fixing metal oxide by using polyurea microcapsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 3.0g of styrene-maleic anhydride copolymer (SMA) and dissolve it in 40mL of deionized water to prepare solution A; add 4.0g of toluene 2,4-diisocyanate (TDI) to 15mL of cyclohexane, 2.0g of Span- 80 (i.e. sorbitan monooleate) and 0.1g magnesium oxide, ultrasonically dispersed for 20 minutes to prepare suspension B; then 2 As a carrier gas, use a peristaltic pump (BTW50 / JY1015) to pump suspension B into a nebulizer (WNA-4-1F2B2, the inner capillary diameter of the nebulizer is 400 μm) at a flow rate of 4 mL / min, and spray into solution A after nebulization A stable O / W emulsion was formed in the medium, and a rapid interfacial polymerization reaction occurred at the same time; after the reaction was carried out for 6 hours, the resulting suspension was concentrated under reduced pressure to obtain a solid powder. The obtained solid powder was washed successively with 95% ethanol and acetone, and air-dried naturally to obtain microcapsules (MgOEn) immobilized with m...

Embodiment 2

[0028] Weigh 2.0g SMA and dissolve it in 10mL deionized water to prepare solution A; add 3.5g TDI, 1.5g Span-80 and 0.1g titanium oxide to 10mL cyclohexane, and ultrasonically disperse for 20 minutes to prepare suspension B; then to N 2 As a carrier gas, use a peristaltic pump to pump the suspension B into the nebulizer at a flow rate of 10 mL / min (the inner capillary diameter of the nebulizer is 500 μm), and spray it into the solution A after atomization to form a stable O / W emulsion. A rapid interfacial polymerization reaction occurred; after the reaction was carried out for a certain period of 6 hours, the resulting suspension was concentrated under reduced pressure to obtain a solid powder. The obtained solid powder is washed with 95% ethanol and acetone in sequence, and air-dried to obtain microcapsules immobilized with titanium oxide.

Embodiment 3

[0030] Weigh 10.0g SMA and dissolve in 50mL deionized water to prepare solution A; add 10.0g isophorone diisocyanate IPDI, 5.0g Span-80 and 0.5g ruthenium dioxide to 30mL cyclohexane, and ultrasonically disperse for 20 minutes Suspension B was prepared; then with N 2 As a carrier gas, use a peristaltic pump to pump the suspension B into the nebulizer at a flow rate of 10 mL / min (the diameter of the inner capillary of the nebulizer is 450 μm), and spray it into the solution A after atomization to form a stable O / W emulsion. A rapid interfacial polymerization reaction occurred; after the reaction was carried out for a certain period of 6 hours, the resulting suspension was concentrated under reduced pressure to obtain a solid powder. The obtained solid powder is washed with 95% ethanol and acetone in sequence, and air-dried to obtain microcapsules immobilized with ruthenium dioxide.

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Abstract

The invention discloses a method for fixing metal oxide by using polyurea microcapsules, the steps of the method are provided as follows: forming solution A by adding 1 to 10 weight parts of surfactant I into 10 to 50 volume parts of deionized water; forming suspension B by ultrasonically dispersing for 20 to 30 minutes after adding 1 to 10 weight parts of diisocyanate, 0.1 to 1 weight parts of metal oxide and 1 to 10 weight parts of surfactant II into 5 to 30 volume parts of organic solvent; pumping the suspension B into a sprayer with a peristaltic pump by taking N2 as the carrier gas, and forming stable O / W emulsion liquid by spraying the solution A after the atomization and simultaneously fast interfacial polymerization happens; obtaining solid powders through vacuum concentration; washing the solid powders in ethanol and acetone, thus obtaining the polyurea microcapsules of the fixed metal oxide after natural drying. The method of the invention has the advantages of simple process, easy operation, low cost, low damage rate and the controllable particle size of the microcapsules of 2 to 60 Mum, etc.

Description

technical field [0001] The invention relates to a method for immobilizing metal oxides, in particular to a method for using polyurea microcapsules to immobilize metal oxides. Background technique [0002] Immobilized metal oxides are widely used in catalysis, medicine, petrochemical and other fields due to their improved stability and mechanical properties. The traditional metal oxide immobilization method is to immobilize the metal salt on a porous carrier such as Al by adsorption. 2 o 3 , SiO 2 And activated carbon, etc., and then synthesize metal oxides on the carrier, there are problems such as complex process, harsh operating conditions, and easy leaching of metal oxides. [0003] Microencapsulation technology has become a very effective method for immobilizing metal oxides because of its simple process, low cost, and effective improvement of the stability of active species. [0004] El-Aaser et al disclosed a TiO 2 immobilization method, the method is to contain T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/16B01J37/00B01J35/02B01J35/00
Inventor 纪红兵刘正平裴丽霞
Owner SOUTH CHINA UNIV OF TECH
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