WO2009095142A1 - Dispersion de dioxyde de silicium - Google Patents

Dispersion de dioxyde de silicium Download PDF

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Publication number
WO2009095142A1
WO2009095142A1 PCT/EP2008/068348 EP2008068348W WO2009095142A1 WO 2009095142 A1 WO2009095142 A1 WO 2009095142A1 EP 2008068348 W EP2008068348 W EP 2008068348W WO 2009095142 A1 WO2009095142 A1 WO 2009095142A1
Authority
WO
WIPO (PCT)
Prior art keywords
dispersion
spray
silicon dioxide
aerosil
alkyl
Prior art date
Application number
PCT/EP2008/068348
Other languages
English (en)
Inventor
Jochen Scheffler
Dirk Schäffner
Gabriele Perlet
Wolfgang Lortz
Original Assignee
Evonik Degussa Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Evonik Degussa Gmbh filed Critical Evonik Degussa Gmbh
Priority to JP2010544608A priority Critical patent/JP2011511749A/ja
Priority to EP08871664A priority patent/EP2234495A1/fr
Publication of WO2009095142A1 publication Critical patent/WO2009095142A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds

Definitions

  • the invention relates to a silicon dioxide dispersion, to a process for the preparation thereof and to the use thereof.
  • Pulverulent hydrophobic silica is used to combat sucking insects, the application taking place by means of dusting (DE 38 35 592) .
  • aqueous dispersions likewise described in DE 38 35 592, which consist of a hydrophobic silica and water, do not exhibit satisfactory stability.
  • US 5 830 512 describes a dispersion in which satisfactory stability is achieved by addition of hydrophilic substances, such as, for example, silicas. However, the active hydrophobic component is through this diluted by a hydrophilic substance. Furthermore, only a very low stability of the dispersion, from hours to a few days, is achieved.
  • hydrophilic substances such as, for example, silicas.
  • EP 1 250 048 describes stabilizing the dispersion of hydrophobic silicon dioxide through gelling additives, such as, for example, xanthan gum, sodium alginates or neutralized carboxyvinyl polymers, mixtures of these additives also being possible.
  • gelling additives such as, for example, xanthan gum, sodium alginates or neutralized carboxyvinyl polymers, mixtures of these additives also being possible.
  • DE 10 2004 021 532 describes a dispersion which, in addition to water, comprises 0.5 to 20% by weight of hydrophobic silica, 0.01 to 10% by weight of a gelling or viscosity-increasing additive, 0.1 to 1% by weight of a preservative and 0 to 1% by weight of a surface-active substance .
  • This dispersion can be used as insecticide against mites and other insects.
  • pump spray bottles are not suitable because the necessary spraying pressure of more than 3 bar usually cannot be achieved. Accordingly, a good spray mist cannot be achieved and accordingly also a uniform covering of the cage area to be sprayed/treated cannot be achieved.
  • This dispersion consists of an aqueous dispersion of a few percent of hydrophilic silica.
  • This dispersion has the disadvantage that it takes too long to dry. Furthermore, it has an excessively high viscosity and also excessively poor spray formation.
  • the spray can has to be lacquered on the inside .
  • the object was accordingly to prepare a dispersion with an insecticidal action which can be satisfactorily sprayed on small surfaces and also can quickly develop its action.
  • a subject-matter of the invention is a dispersion comprising hydrophobic pyrogenically prepared silicon dioxide, alcohol and at least one additive which promotes the dispersing.
  • hydrophobic pyrogenically prepared silicon dioxide of: Aerosil® R805, Aerosil® R974, Aerosil® R202, Aerosil® R812, Aerosil® R812S and Aerosil® R8200.
  • Aerosil® R812S Use may in particular be made of Aerosil® R812S.
  • alcohol methanol, ethanol, propanol, isopropanol, 1-butanol, 2-methyl-l-propanol, 2-butanol and 2-methyl-2-propanol .
  • Use may in particular be made of low-boiling-point alcohols, such as, for example, ethanol.
  • HMDS hexamethyldisilazane
  • HMDS results, by this additional silanization, in a virtually perfect surface modification, through which a considerably lower viscosity is achieved. If appropriate, any excess HMDS can be converted by alcoholysis to give trimethylethoxysilane, trimethylsilanol or hexamethyldi- siloxane, and NH 3 .
  • Use may furthermore be made, as additive which promotes the dispersion, of other silanes which are likewise in a position to react with Si-OH groups still present on the Aerosil surface.
  • any silane is suitable which exhibits a satisfactory hydrophobic group but which in this connection does not introduce, through the silanization, any accessible additional silanol group.
  • This can be achieved by having present only one group in the silane molecule capable of reacting with the SiOH group of the surface, thus an ROH or X group.
  • the hydrophobic "residue" of the silane molecule can have such a strong sterically shielding effect that an unreacted SiOH group of the silane molecule is not accessible.
  • the silane used should exhibit a high reaction rate. A satisfactory reaction rate may possibly be achieved by an increase in temperature.
  • Silazanes and here in particular hexamethyldisilazane, have, due to the basic nature of the silazane group, a high affinity for SiOH surface groups. Only in the subsequent step is the trimethylsilyl group transferred. Trimethyl- silyl groups not reacted with SiOH surface groups are themselves inactivated by dimerization .
  • silanes can be used as additional silanes: a) organosilanes of the (RO) 3 Si(C n H 2n+I ) and (RO) 3 Si(C n H 2n -I) type
  • R alkyl, such as, for example, methyl, ethyl, n-propyl, isopropyl or butyl
  • R' alkyl, such as, for example, methyl, ethyl, n-propyl, isopropyl or butyl
  • X Cl, Br
  • R' alkyl, such as, for example, methyl, ethyl, n-propyl, isopropyl or butyl
  • R' alkyl, such as, for example, methyl, ethyl, n-propyl, isopropyl or butyl
  • R' methyl, aryl (for example -C 6 H 5 , substituted phenyl radicals) -C 4 F 9 , OCF 2 -CHF-CF 3 , -C 6 F 13 , -0-CF 2 -CHF 2
  • R' methyl, aryl (for example -C 6 H 5 , substituted phenyl radicals) -C 4 F 9 , -OCF 2 -CHF-CF 3 , -C 6 F 13 , -0-CF 2 -CHF 2
  • R' methyl, aryl (for example -C 6 H 5 , substituted phenyl radicals)
  • R' methyl, aryl (e.g. -C 6 H 5 , substituted phenyl radicals)
  • R' methyl, aryl (e.g. -C 6 H 5 , substituted phenyl radicals)
  • cyclic polysiloxanes of the D3, D4 and D5 type D3, D4 and D5 being understood as meaning cyclic polysiloxanes with 3, 4 or 5 units of the -O-Si (CH 3 ) 2 - type.
  • octamethylcyclotetrasiloxane D4
  • Hydrophobic pyrogenically prepared silicon dioxides can be very well dispersed in alcohols since these are wetted with alcohols.
  • Rheology-modifying additives can be added for satisfactory adhesion of the Aerosil to the surfaces/cage areas to be covered and in order to prevent the sprayed-on dispersion from flowing off.
  • Such additives can be alcohol-soluble modified celluloses.
  • Hydroxypropylcellulose can in particular be used for this since it is satisfactorily soluble in alcohols.
  • the hydroxypropylcellulose can exhibit a molecular weight of less than 1 000 000.
  • the hydroxypropylcellulose can exhibit a molecular weight of 5000 to 500 000, in particular 80 000 ⁇ 20 000.
  • the amounts of the rheology-modifying agent used also affects the activity of the dispersion.
  • This amount used can be limited by the product of the average molecular weight of the hydroxypropylcellulose and the concentration in % by weight. It can be less than 250 000.
  • HPC with an excessively high molecular weight of more than 1 000 000 results in a high structural viscosity which not only leads to a poor ability to be sprayed but also contributes to a reduction in the mortality.
  • the dispersion according to the invention can be composed of hydrophobic pyrogenically prepared silicon dioxide, alcohol and an additive which promotes the dispersion. If appropriate, the preferred dispersion can additionally comprise a rheology-modifying additive.
  • the dispersion according to the invention can be used as insecticide, in particular for combating mites.
  • the dispersions according to the invention can be satisfactorily sprayed with propellent gas sprays.
  • An additional advantage of the alcoholic dispersion according to the invention is caused by the fact that the alcohol does not have a corrosive effect on the metals used in spray cans. Internal lacquering of the cans can accordingly be dispensed with.
  • An additional subject-matter of the invention is a spray can which comprises the dispersion according to the invention .
  • This spray can additionally comprise a propellent.
  • Use may be made, as propellent, of propane, butane or a mixture of propane and butane with a proportion of propellent gas of 10 to 80%.
  • Nitrogen or nitrous oxide can be used as propellent gas.
  • the pressure necessary for the spraying can be produced by a pump system.
  • the viscosity of the dispersions produced was determined using a rotational rheometer from Physica Model 300 and the measuring cup CC 27 at 25°C.
  • HMDS hexamethyldisilazane
  • Aerosil® R812S hexamethyldisilazane
  • HPC hydroxypropyl cellulose with a molar mass M of approximately 80 000 from Sigma-Aldrich
  • the mixture is subsequently diluted with an additional 327 g of ethanol to an Aerosil® R812S content of 15%. Finally, the mixture is dispersed at 1000 rpm for 15 minutes, resulting in the dissolution of the hydroxypropyl cellulose.
  • This dispersion is bottled in spray bottles and placed under pressure with a propane/butane mixture. Good spray formation can be produced. This means that a uniform coating of a surface is possible.
  • Aerosil® R812S used is a pyrogenically prepared silicon dioxide with the physicochemical characteristics given in Table 1.
  • HMDS hexamethyldisilazane
  • Aerosil® R812S hexamethyldisilazane
  • HPC hydroxypropyl cellulose with a molar mass M of approximately 370 000 from Sigma-Aldrich
  • the mixture is subsequently diluted with an additional 329.7 g of ethanol to an Aerosil® R812S content of 15%.
  • the mixture is dispersed at 1000 rpm for 15 minutes, resulting in the dissolution of the hydroxypropyl cellulose.
  • This dispersion is now bottled in spray bottles and placed under pressure with a propane/butane mixture. Good spray formation can be produced. This means that a uniform coating of a surface is possible.
  • Aerosil® R812S hexamethyldisilazane
  • 200 g of Aerosil® R812S are then incorporated with stirring using a high-speed laboratory stirrer (jacketed dispersion containers, Dispermat® dissolver from VMA-Getzmann GmbH, toothed disc with a diameter of 70 mm) and subsequently dispersed at 2200 rpm for 15 minutes.
  • 1.66 g of HPC hydroxypropyl cellulose with a molar mass M of approximately 1 000 000 from Sigma-Aldrich
  • the mixture is subsequently diluted with an additional 332 g of ethanol to an Aerosil® R812S content of 15%.
  • the mixture is dispersed at 1000 rpm for 15 minutes, resulting in the dissolution of the hydroxypropyl cellulose.
  • This dispersion is now bottled in spray bottles and placed under pressure with a propane/butane mixture. Good spray formation can be produced. This means that a uniform coating of a surface is possible.
  • This spray was used for the spraying of cage areas occupied by mites.
  • HMDS hexamethyldisilazane
  • Dispermat® dissolver from VMA-Getzmann GmbH, toothed disc with a diameter of 70 mm) and subsequently dispersed at 2200 rpm for 15 minutes. 6.66 g of HPC (hydroxypropyl cellulose with a molar mass M of approximately 1 000 000 from Sigma-Aldrich) are now added. The mixture is subsequently diluted with an additional 327 g of ethanol to an Aerosil® R812S content of 15%. Finally, the mixture is dispersed at 1000 rpm for 15 minutes and the HPC is dissolved.
  • HPC hydroxypropyl cellulose with a molar mass M of approximately 1 000 000 from Sigma-Aldrich
  • This dispersion is now bottled in spray bottles and placed under pressure with a propane/butane mixture. Due to the high viscosity, good spray formation cannot be achieved. This means that a uniform coating of a surface is not possible .

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Agronomy & Crop Science (AREA)
  • Inorganic Chemistry (AREA)
  • Pest Control & Pesticides (AREA)
  • Plant Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Silicon Compounds (AREA)

Abstract

L'invention concerne une dispersion comprenant du dioxyde de silicium hydrophobe préparé par pyrogénation, un alcool et au moins un additif qui favorise la dispersion. La dispersion peut être emballée dans des atomiseurs et utilisée comme acaricide et insecticide.
PCT/EP2008/068348 2008-01-31 2008-12-30 Dispersion de dioxyde de silicium WO2009095142A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2010544608A JP2011511749A (ja) 2008-01-31 2008-12-30 二酸化ケイ素分散液
EP08871664A EP2234495A1 (fr) 2008-01-31 2008-12-30 Dispersion de dioxyde de silicium

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810006884 DE102008006884A1 (de) 2008-01-31 2008-01-31 Siliciumdioxid-Dispersion
DE102008006884.5 2008-01-31

Publications (1)

Publication Number Publication Date
WO2009095142A1 true WO2009095142A1 (fr) 2009-08-06

Family

ID=40532590

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/068348 WO2009095142A1 (fr) 2008-01-31 2008-12-30 Dispersion de dioxyde de silicium

Country Status (4)

Country Link
EP (1) EP2234495A1 (fr)
JP (1) JP2011511749A (fr)
DE (1) DE102008006884A1 (fr)
WO (1) WO2009095142A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009095141A2 (fr) * 2008-01-31 2009-08-06 Evonik Degussa Gmbh Dispersion contenant du dioxyde de silicium

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3080741B1 (fr) * 2018-05-04 2020-07-31 Ab7 Innovation Composition insecticide contenant une silice hydrophobe
JPWO2021112206A1 (fr) * 2019-12-06 2021-06-10

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004104154A2 (fr) * 2003-05-23 2004-12-02 Degussa Ag Melange pulverulent comprenant du peroxyde d'hydrogene et du dioxyde de silicium hydrophobe
WO2005104851A2 (fr) * 2004-05-03 2005-11-10 Degussa Ag Dispersion presentant des proprietes insecticides

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1542748A1 (de) * 1964-12-30 1970-07-30 Degussa Schaedlingsbekaempfungsmittel
DE3835592A1 (de) 1988-10-19 1990-04-26 Degussa Insektizide
US5830512A (en) 1992-11-03 1998-11-03 Vrba; Cenek H. Insect control compositions
BR0015676A (pt) 1999-11-18 2002-08-06 Sorex Ltd Composição pesticida, método para controlar pestes, e, uso de uma composição de gel aerado estável em armazenamento
DE10231757A1 (de) * 2002-07-13 2004-01-22 Creavis Gesellschaft Für Technologie Und Innovation Mbh Verfahren zur Herstellung einer tensidfreien Suspension auf wässriger basis von nanostrukturierten, hydrophoben Partikeln und deren Verwendung
US20040062783A1 (en) * 2002-09-27 2004-04-01 Xavier De Sloovere Composition for combating insects and parasites
DE10250328A1 (de) * 2002-10-29 2004-05-13 Creavis Gesellschaft Für Technologie Und Innovation Mbh Herstellung von Suspensionen hydrophober Oxidpartikel
DE10315128A1 (de) * 2003-04-03 2004-10-14 Creavis Gesellschaft Für Technologie Und Innovation Mbh Verfahren zur Unterdrückung von Schimmelbildung unter Verwendung hydrophober Stoffe sowie ein schimmelpilzhemmendes Mittel für Gebäudeteile

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004104154A2 (fr) * 2003-05-23 2004-12-02 Degussa Ag Melange pulverulent comprenant du peroxyde d'hydrogene et du dioxyde de silicium hydrophobe
WO2005104851A2 (fr) * 2004-05-03 2005-11-10 Degussa Ag Dispersion presentant des proprietes insecticides

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009095141A2 (fr) * 2008-01-31 2009-08-06 Evonik Degussa Gmbh Dispersion contenant du dioxyde de silicium
WO2009095141A3 (fr) * 2008-01-31 2010-09-23 Evonik Degussa Gmbh Dispersion contenant du dioxyde de silicium

Also Published As

Publication number Publication date
DE102008006884A1 (de) 2009-08-06
JP2011511749A (ja) 2011-04-14
EP2234495A1 (fr) 2010-10-06

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