EP2285741A2 - Dispersion de silice - Google Patents

Dispersion de silice

Info

Publication number
EP2285741A2
EP2285741A2 EP08871855A EP08871855A EP2285741A2 EP 2285741 A2 EP2285741 A2 EP 2285741A2 EP 08871855 A EP08871855 A EP 08871855A EP 08871855 A EP08871855 A EP 08871855A EP 2285741 A2 EP2285741 A2 EP 2285741A2
Authority
EP
European Patent Office
Prior art keywords
insecticides
dispersion
acaricides
weight
methyl
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP08871855A
Other languages
German (de)
English (en)
Inventor
Jochen Scheffler
Wolfgang Lortz
Gabriele Perlet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Operations GmbH
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
Publication of EP2285741A2 publication Critical patent/EP2285741A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/113—Silicon oxides; Hydrates thereof
    • C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
    • C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
    • 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
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/02—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing liquids as carriers, diluents or solvents
    • A01N25/04—Dispersions, emulsions, suspoemulsions, suspension concentrates or gels
    • 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 silica 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 xanthan gum, sodium alginates or neutralized carboxyvinyl polymers, mixtures of these additives also being possible.
  • a distinct structural viscosity is exhibited when applying by spraying: during the spraying process, the viscosity of the dispersion is relatively low at the shear forces acting on it. After the dispersion drops impact the surface to be coated, the visocity again increases strongly, in order to avoid dripping/running off from in particular vertical surfaces .
  • Example 1 a density of only 0.6 g/ml is specified, i.e. that approximately 40% of the volume consists of air.
  • 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 agent .
  • This dispersion can be used as insecticide against insects and as acaricide against Arachnids, such as, e.g., mites.
  • the known dispersion has the disadvantage that it loses activity at high air humidity because, e.g., the mites then are not desiccated.
  • the known chemically active pesticides such as insecticides and in particular acaricides (pesticides for combating mites and ticks), are certainly highly active, even at high air humidities; unfortunately, relatively high residues of the pesticides can also be observed however, e.g. in uses in henhouses against the poultry red mite in the chicken and chicken eggs.
  • the object is accordingly to modify the silica dispersion so that the dispersion is active even at high air humidity, without resulting in major formation of organic pesticide residues .
  • a subject-matter of the invention is a dispersion comprising, in addition to water, from 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 agent, which is characterized in that it comprises, as additional component, at least one pesticide and/or acaracide .
  • the use of the dispersion according to the invention with markedly reduced organic pesticide concentration can furthermore result in a considerable reduction in the residue formation, e.g. with uses in henhouses against the poultry red mite in the chicken and in the egg.
  • the dispersion according to the invention comprises an active pesticide component with a damaging or lethal effect, it is also possible to combat harmful organisms which are resistant to desiccation, be it through a considerably denser surface than with mites or through the sheer size of the harmful organism, in which the surface to volume ratio is markedly smaller in comparison with the relatively small mites. Desiccation accordingly cannot be achieved or cannot be quickly achieved.
  • active substance groups can in particular be used as insecticides or acaricides, some exhibiting both insecticidal and acaricidal properties.
  • EMPC ethiofencarb fenethacarb fenobucarb isoprocarb methiocarb metolcarb mexacarbate promacyl promecarb propoxur trimethacarb XMC xylylcarb • diamide insecticides chlorantraniliprole flubendiamide
  • fluorine insecticides sulfluramid • formamidine insecticides amitraz chlordimeform formetanate formparanate • insect growth regulators o chitin synthesis inhibitors bistrifluron buprofezin chlorfluazuron cyromazine diflubenzuron flucycloxuron flufenoxuron hexaflumuron lufenuron novaluron noviflumuron penfluron teflubenzuron triflumuron o juvenile hormone mimics epofenonane fenoxycarb hydroprene kinoprene methoprene pyriproxyfen triprene o juvenile hormones juvenile hormone I juvenile hormone II juvenile hormone III o moulting hormone agonists chromafenozide halofenozide methoxyfenozide tebufenozide o moulting hormones ⁇ -ecdysone ecdysterone o
  • organochlorine insecticides bromo-DDT camphechlor DDT pp '-DDT ethyl-DDD HCH gamma-HCH lindane methoxychlor pentachlorophenol TDE o cyclodiene insecticides aldrin bromocyclen chlorbicyclen chlordan chlordecone dieldrin dilor endosulfan endrin
  • organophosphorus insecticides o organophosphate insecticides bromfenvinfos chlorfenvinphos crotoxyphos dichlorvos dicrotophos dimethylvinphos fospirate heptenophos methocrotophos mevinphos monocrotophos naled naftalofos phosphamidon propaphos TEPP tetrachlorvinphos organothiophosphate insecticides dioxabenzofos fosmethilan phenthoate ⁇ aliphatic organothiophosphate insecticides acethion amiton cadusafos chlorethoxyfos chlormephos demephion demephion-0 demephion-S demeton demeton-0 demeton-S demeton-methyl demeton-0-methyl demeton-S-methyl demeton-S-methylsulphon disulfoton ethion ethoprophos
  • IPSP isothioate malathion methacrifos oxydemeton-methyl oxydeprofos oxydisulfoton phorate sulfotep terbufos thiometon ⁇ aliphatic amide organothiophosphate insecticides amidithion cyanthoate dimethoate ethoate-methyl formothion mecarbam omethoate prothoate sophamide vamidothion
  • pyrethroid insecticides o pyrethroid ester insecticides acrinathrin allethrin bioallethrin barthrin bifenthrin bioethanomethrin cyclethrin cycloprothrin cyfluthrin beta-cyfluthrin cyhalothrin gamma-cyhalothrin lambda-cyhalothrin cypermethrin alpha-cypermethrin beta-cypermethrin theta-cypermethrin zeta-cypermethrin cyphenothrin deltamethrin dimefluthrin dimethrin empenthrin fenfluthrin fenpirithrin fenpropathrin fenvalerate esfenvalerate flucythrinate fluvalinate tau-fluvalinate furethrin imiprothrin metoflu
  • antibiotic insecticides allosamidin thuringiensin o macrocyclic lactone insecticides ⁇ avermectin insecticides abamectin doramectin emamectin eprinomectin ivermectin selamectin
  • organotin acaricides azocyclotin cyhexatin fenbutatin oxide
  • antibiotic acaricides nikkomycins thuringiensin o macrocyclic lactone acaricides tetranactin ⁇ avermectin acaricides abamectin doramectin eprinomectin ivermectin selamectin
  • the proportion of water can be from 68 to 99.4% by weight.
  • the specific density of the dispersion can be greater than 0.6 g/ml, preferably from 0.7 to 1.02 g/ml .
  • Use may be made, as hydrophobic silica, of a pyrogenically prepared hydrophobized silica. It can exhibit a BET surface of 20 to 600 m 2 /g.
  • the gelling or viscosity-increasing additive can be a biopolymer, such as, for example, xanthan gum, sodium alginate, locust bean flour, pectin, agar, carrageenans, alginates and/or neutralized carboxyvinyl polymers, or mixtures of these substances.
  • Use may be made, as preservatives, of preservatives approved for foods.
  • These can be: sorbic acid, sodium sorbate, potassium sorbate, calcium sorbate, benzoic acid, sodium benzoate, potassium benzoate, calcium benzoate, PHB ethyl ester, PHB ethyl ester sodium salt, PHB propyl ester, PHB propyl ester sodium salt, PHB methyl ester, PHB methyl ester sodium salt, sulphur dioxide, sodium sulphite, sodium hydrogensulphite, sodium disulphite, potassium disulphite, calcium disulphite, calcium hydrogensulphite, biphenyl, ortho-phenylphenol, sodium ortho-phenylphenolate, thiabendazole, nisin, natamycin, formic acid, sodium formate, calcium formate, hexamethylenetetramine, dimethyl dicarbonate, propionic acid, sodium propionate, calcium propionate, or potassium propionate
  • nitrates nitrites
  • carbon dioxide nitrites
  • chlorine nitrites
  • Use may be made, as surface-active agents, of ionic, nonionic and anionic surfactants.
  • An additional subject-matter of the invention is a process for the preparation of the dispersion according to the invention, which is characterized in that the individual components are dispersed, successively or together, in the water and, in this connection, the individual components are deaerated before and/or during the addition or the dispersion is deaerated during the individual dispersing stages. Residual dispersed air still present can finally be removed by further mixing under vacuum.
  • the deaerating can be carried out by means of application of vacuum.
  • a stable and active dispersion can be achieved which does not comprise extensive amounts of air.
  • This deaerated dispersion can be obtained by the dispersing of previously deaerated hydrophobic SiC>2.
  • a subsequent deaerating of the dispersions is admittedly possible technically but can only be achieved with great effort due to the increased viscosity of the homogeneous phase water (gelling agent as additive) .
  • At least the largest possible portion of the air which can be dispersed can be removed by deaeration measures before or during the dispersing.
  • any dispersing process is suitable which either makes possible prior deaerating of the powder to be dispersed or prevents air from being dispersed during the dispersing.
  • One embodiment of the deaerating and dispersing is the use of a vacuum dissolver.
  • water and the gelling additive to be briefly predispersed, for the entire amount of hydrophobic SiC>2 to be then added without stirring to the surface of the solution, for the mixture to be evacuated and only then for dispersing of the hydrophobic SiC>2 to be begun.
  • a PSI Mix® from Netzsch can also manage this deaerating of the powder.
  • deaerating units such as the Netzsch DA-VS vacuum deaerator from Netzsch, a vacuum thin-film rotation method.
  • the dispersion according to the invention can be used, for example, as pesticide or acaricide against house dust mite: Dermatophagoides pteronyssinus poultry red mite: Dermanyssus gallinae red flour beetle: Tribolium castaneum granary weevil: Sitophilus granarius

Landscapes

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

Abstract

L'invention porte sur une dispersion comprenant, en plus de l'eau, de 0,5 à 20 % en poids de silice hydrophobe, 0,01 à 10 % en poids d'un additif gélifiant ou d'augmentation de la viscosité, 0,1 à 1 % en poids d'un conservateur et 0 à 1 % en poids d'un agent tensioactif, qui comprend, comme composant supplémentaire, au moins un insecticide et/ou acaricide. Elle est préparée par dispersion des composants individuels, successivement ou conjointement, dans l'eau et, à cet égard, désaération des composants individuels avant et/ou pendant l'ajout ou la désaération de la dispersion pendant les étapes individuelles de dispersion. La dispersion peut être utilisée comme insecticide ou acaricide.
EP08871855A 2008-01-30 2008-12-30 Dispersion de silice Withdrawn EP2285741A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008006683A DE102008006683A1 (de) 2008-01-30 2008-01-30 Kieselsäuredispersion
PCT/EP2008/068339 WO2009095139A2 (fr) 2008-01-30 2008-12-30 Dispersion de silice

Publications (1)

Publication Number Publication Date
EP2285741A2 true EP2285741A2 (fr) 2011-02-23

Family

ID=40822005

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08871855A Withdrawn EP2285741A2 (fr) 2008-01-30 2008-12-30 Dispersion de silice

Country Status (4)

Country Link
EP (1) EP2285741A2 (fr)
JP (1) JP2011514312A (fr)
DE (1) DE102008006683A1 (fr)
WO (1) WO2009095139A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008006883A1 (de) * 2008-01-31 2009-08-13 Evonik Degussa Gmbh Siliciumdioxid-Dispersion
DE102010052152A1 (de) 2010-11-22 2012-05-24 Universität Hohenheim Vorrichtung und Verfahren zum Bekämpfen von Vogelparasiten
JPWO2015105128A1 (ja) * 2014-01-08 2017-03-23 アース製薬株式会社 トコジラミ駆除剤、トコジラミ駆除用組成物及びトコジラミ駆除方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1476633A (en) * 1973-10-03 1977-06-16 Unilever Ltd Dentifrice composition

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3835592A1 (de) * 1988-10-19 1990-04-26 Degussa Insektizide
WO1994009626A1 (fr) * 1992-11-03 1994-05-11 Sil-Tech International Corporation Compositions de lutte contre les insectes
CA2390146C (fr) * 1999-11-18 2011-01-18 Sorex Limited Compositions pesticides comprenant un gel aere qui renferme de la silice hydrophobe
EP1276377B1 (fr) * 2000-04-27 2004-03-03 Sorex Limited Compositions biocides comprenant un aerogel contenant du silice hydrophobe
DE102004021532A1 (de) 2004-05-03 2005-12-08 Degussa Ag Dispersion mit insektizider Wirkung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1476633A (en) * 1973-10-03 1977-06-16 Unilever Ltd Dentifrice composition

Also Published As

Publication number Publication date
JP2011514312A (ja) 2011-05-06
WO2009095139A3 (fr) 2009-11-19
WO2009095139A2 (fr) 2009-08-06
DE102008006683A1 (de) 2009-08-06

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