CN1478598A - Method of using isocyanate for modification and cladding nanometer particle surface - Google Patents
Method of using isocyanate for modification and cladding nanometer particle surface Download PDFInfo
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- CN1478598A CN1478598A CNA031397646A CN03139764A CN1478598A CN 1478598 A CN1478598 A CN 1478598A CN A031397646 A CNA031397646 A CN A031397646A CN 03139764 A CN03139764 A CN 03139764A CN 1478598 A CN1478598 A CN 1478598A
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- isocyanates
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Abstract
A process for modifying and coating the surface of nanoparticle by isocyanate includes such steps as dispersing the nanoparticles in acetone, adding isocyanate while stirring, laying aside, filtering, drying. The modified nano catalyst has high catalyzing effect to the combustion of solid propellant.
Description
Technical field
What the present invention relates to is nanoparticle surface modified and the method that coats, especially a kind of with isocyanates to method nanoparticle surface modified and that coat.
Background technology
Nanocatalyst has skin effect, particle diameter is little, specific area is big, the surface atom coordination is incomplete, causes the surface-active position to increase, and the surface has formed rough atomic steps, in solid propellant, can increase the contact area of it and oxidant and binding agent, enlarge its site of action, increase the interface catalytic effect, improve catalytic effect, improve the combustibility of novel propellant, improve combustion speed, reduce pressure index.Its catalytic effect is much larger than the regular grade catalyst.
Present studies show that, though nanocatalyst has catalytic effect preferably to SOLID PROPELLANT COMBUSTION, but still not ideal enough.Its reason is that nanoparticle surface can be high, easily reunite, the surface property of inorganic nano-particle and propellant organic component has bigger difference, both compatibilities are poor, in the hydrophobic environment of propellant, even the inorganic nano-particle of high degree of dispersion also can cause reunion, in propellant component, can not evenly disperse, so that can not give full play to the due catalytic efficiency of nanocatalyst.
Summary of the invention
The objective of the invention is deficiency, provide a kind of isocyanates method nanoparticle surface modified and that coat at above-mentioned nanocatalyst existence.It can effectively prevent the reunion of nano particle, can improve the stability and the surface-active of nano particle again.
To method nanoparticle surface modified and that coat, it is characterized in that: the nano particle that will modify and coat places container, extraordinarily goes into acetone solvent by 2 ~ 4 of nano particle weight with isocyanates in the present invention, and ultrasonic wave disperseed 5 ~ 20 minutes; Under agitation add 8 ~ 50% the isocyanates press nano particle weight; Continue to stir after 0.5 ~ 1 hour and placed 2 ~ 6 hours; Behind above-mentioned product filtration, airing, placed 80 ℃ of insulating boxs dry 2 ~ 5 hours, can make the nano particle that the surface is modified and coat.
Described nano particle can be nano-metal-oxide or nano-metal composite oxide powder.
Described isocyanates be following any: toluene di-isocyanate(TDI) (TDI), hexamethylene-diisocyanate (HMDI), methylene diphenyl isocyanates (MDI), IPDI (IPDI) and other all polyisocyanates.
The inventive method is carried out the nano particle of finishing and coating, and the weight of its surface coated organic layer accounts for 5 ~ 30% (wt) of nano particle gross weight.
Method of the present invention is applicable to various nano-metal-oxides or nano-metal composite oxide powder.
Nano particle connects organic group on the surface of nano particle, or forms the organic film of one deck with after the isocyanates finishing and coating, and both can effectively prevent the reunion of nano particle, improves the stability of nano particle again, and surface-active can be protected.Main is, form hydrophobic surface in nanoparticle surface, compatibility is preferably arranged, can obviously improve the dispersiveness of nano particle in the organic component of propellant with organic facies, the contact area of increase and propellant, thereby the catalytic action that improves nanocatalyst.
The nano particle of modifying and coating through method of the present invention has very high catalytic effect to the burning of double-basis or modified double base propellant.For example: with the nanometer copper-plumbum composite oxide powder of isocyanates finishing and coating, can make certain double base propellant combustion speed under low pressure improve 2 ~ 3 times, the pressure index descends, and platform and negative pressure index occur.
The present invention is provided by following examples concrete grammar nanoparticle surface modified and that coat in detail with isocyanates.
The specific embodiment
Embodiment: a kind of as follows to the concrete grammar that nanometer copper-Xi composite oxide powder surface is modified and coated with toluene di-isocyanate(TDI) (TDI):
With 50g nanometer copper-Xi CuO-SnO
2Composite oxide powder places the 500ml beaker of a drying, adds 150ml acetone (optical voidness), and ultrasonic wave disperseed 15 minutes, made nanometer CuO-SnO
2Be dispersed in the acetone soln.Under agitation add toluene di-isocyanate(TDI) 15ml, stirred 0.5 hour again, placed then 5 hours, filter with G4 bacterium funnel, product placed 80 ℃ of dryings of thermostatic drying chamber 3 hours behind airing, can make the CUO-SnO of surface modification and coating
2Composite oxide powder.
Nanometer copper-Xi CuO-SnO that the present embodiment method obtains
2The composite oxide powder particle is 20% (weight) with the content that thermogravimetric analysis (TG) records organic clad.
Claims (5)
1, a kind of with isocyanates to method nanoparticle surface modified and that coat, it is characterized in that: the nano particle that will modify and coat places container, extraordinarily goes into acetone solvent by 2 ~ 4 of nano particle weight, ultrasonic wave dispersion 5 ~ 20 minutes; Under agitation add 8 ~ 50% the isocyanates press nano particle weight; Continue to stir after 0.5 ~ 1 hour and placed 2 ~ 6 hours; Behind above-mentioned product filtration, airing, placed 80 ℃ of insulating boxs dry 2 ~ 5 hours, can make the nano particle that the surface is modified and coat.
2, according to claim 1 described with isocyanates to method nanoparticle surface modified and that coat, it is characterized in that: described nano particle can be nano-metal-oxide and nano-metal composite oxide powder.
3, according to claim 1 or 2 described with isocyanates to method nanoparticle surface modified and that coat, it is characterized in that: isocyanates is a kind of in toluene di-isocyanate(TDI) (TDI) or hexamethylene-diisocyanate (HMDI) or methylene diphenyl isocyanates (MDI) or IPDI (IPDI) or other all polyisocyanates.
4, according to claim 1 or 2 described with isocyanates to method nanoparticle surface modified and that coat, it is characterized in that: the addition of acetone solvent is 3 times of nano particle weight.
5, according to claim 1 or 2 described with isocyanates to method nanoparticle surface modified and that coat, it is characterized in that: through the nano particle of this method finishing and coating, the weight of its surface coated organic layer accounts for 5 ~ 30% (wt) of nano particle gross weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03139764 CN1216693C (en) | 2003-07-07 | 2003-07-07 | Method of using isocyanate for modification and cladding nanometer particle surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03139764 CN1216693C (en) | 2003-07-07 | 2003-07-07 | Method of using isocyanate for modification and cladding nanometer particle surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1478598A true CN1478598A (en) | 2004-03-03 |
| CN1216693C CN1216693C (en) | 2005-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03139764 Expired - Fee Related CN1216693C (en) | 2003-07-07 | 2003-07-07 | Method of using isocyanate for modification and cladding nanometer particle surface |
Country Status (1)
| Country | Link |
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| CN (1) | CN1216693C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101376101B (en) * | 2007-08-30 | 2013-01-02 | 中国科学院福建物质结构研究所 | Bitter earth nano-catalyst material capable of being used for high-energy solid propellant and synthetic method thereof |
| CN103038291A (en) * | 2010-09-24 | 2013-04-10 | 纳幕尔杜邦公司 | Coating composition for metal conductors |
-
2003
- 2003-07-07 CN CN 03139764 patent/CN1216693C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101376101B (en) * | 2007-08-30 | 2013-01-02 | 中国科学院福建物质结构研究所 | Bitter earth nano-catalyst material capable of being used for high-energy solid propellant and synthetic method thereof |
| CN103038291A (en) * | 2010-09-24 | 2013-04-10 | 纳幕尔杜邦公司 | Coating composition for metal conductors |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1216693C (en) | 2005-08-31 |
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