Anti-fouling composition comprising an aerogel

an aerogel and composition technology, applied in the direction of biocides, peptide/protein ingredients, coatings, etc., can solve the problems that the coatings, however, are toxic to marine organisms, and achieve the effects of small pore size, high porosity, and large surface area

Inactive Publication Date: 2010-10-28
ENPROS AS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0028]Xerogel: A xerogel is a solid formed from a gel by drying with unhindered shrinkage. Xerogel usually retains high porosity (25%) and enormous surface area (150-900 m2 / g), along with very small pore size (1-10 nm). When solvent removal occurs under hypercritical (supercritical) conditions, the network does not shrink and a highly porous, low-density material known as an aerogel is produced. Heat treatment of a xerogel at elevated temperature produces viscous sintering and effectively transforms the porous gel into a dense glass.

Problems solved by technology

Coatings, however, have been found to be toxic to marine organisms.
The ban of organotins such as TBT and triphenyltin (TPT), and other toxic biocides in marine coatings is a severe problem for the shipping industry; it presents a major challenge for the producers of coatings to develop alternative technologies to prevent fouling on ship hulls.

Method used

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  • Anti-fouling composition comprising an aerogel
  • Anti-fouling composition comprising an aerogel

Examples

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example 1

[0450]The aerogel comprises siliciumoxid. The aerogel is obtained by hydrolysis of tetraalkoxysiloxane dissolved in alcohol. The alcohol is subsequently removed from the generated network by exchange with supercritical CO2. This solvent can be evaporated without collaps of the aerogel.

[0451]The aerogel is obtained by drying of a wet gel. During this process the liquid is removed from the nanopores in the gel. The drying is performed in the presence of supercritical CO2 or another supercritical solvent. It is important to go directly from the liquid phase to a supercritical phase and subsequently directly from the supercritical phase to a gas phase. An alternative to the supercritic drying is use of DCCA (Drying Control Chemical Additives), ambient pressure drying and freeze drying.

[0452]The wet gel is obtained by a SOL-GEL process. The SOL-GEL process is typically performed at temperatures lower than 100° C. For preparation of in-organic gells, typically metaloxides, the reaction ty...

example 2

[0453]The aerogel is obtained as described in example 1. The aerogel further comprises one or more enzymes and / or one or more other bioactive agents. The one or more enzymes and / or the one or more other bioactive agents are added to the alcohol during the generation of the network. This process results in encapsulation of the one or more enzymes and / or the one or more other bioactive agents in the aerogel. The process described in example 1 may be interrupted after preparation of colloid particles containing an enzyme as described in example 2. Completion of the network may be performed under addition of one or more different active components. Hereby the control of spatically distributed actiove compounds can be obtained

example 3

[0454]The aerogel is obtained as described in example 1 or 2. The aerogel further comprises 1-10% dimethyldialkoxysiloxane to adjust the hydrophobicity of the aerogel. Other alkoxysiloxanes may me used to obtain similar adjustments in hydrophobicity.

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Abstract

The present invention also relates to an anti-fouling composition comprising one or more aerogels. In one embodiment the aerogel encapsulate one or more bioactive agents. The one or more encapsulated bioactive agents can in one preferred embodiment be released from the aerogel over time. In one embodiment the encapsulated bioactive agents comprise one or more enzymes. In one preferred embodiment the anti-fouling composition comprising one or more aerogels is a coating composition.

Description

[0001]This application is a non-provisional of U.S. provisional application Ser. No. 60 / 987,221 filed 12 Nov. 2007, which is hereby incorporated by reference in its entirety.[0002]All patent and non-patent references cited in the application, or in the present application, are also hereby incorporated by reference in their entirety.BACKGROUND OF INVENTION[0003]Aerogels[0004]Aerogel is a low-density solid-state material derived from gel in which the liquid component of the gel has been replaced with gas. The result is a low density solid with several characteristic properties such as its effectiveness as an insulator.[0005]Aerogel was first created by Steven Kistler in 1931. Aerogels are in general produced by extracting the liquid component of a gel through supercritical drying. This allows the liquid to be slowly drawn off without causing the solid matrix in the gel to collapse from capillary action, as would happen with conventional evaporation. The first aerogels were produced fr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D5/16C09D7/61C09D7/65
CPCB01J13/0091C08K3/22C08K3/34A61K38/482C09D5/1687C09D7/1291A61K9/48C09D5/1637C09D7/70C09D7/61C09D7/65
Inventor TOFTE JESPERSEN, HENRIKALLERMANN, KNUDSCHNEIDER, IBSCHAUMBURG, KJELD
Owner ENPROS AS
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