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Novel Thermoset Siloxane-Urethane Fouling Release Coatings

Technology Benefits

These self-stratifying coatings, phase separate into a low surface energy, low modulus top layer, with a tougher lower layer design. These systems are cross-linked, which results in the locking of the structure in place and resulting in a conformation that does not rearrange on exposure to water.

Detailed Technology Description

The exploration of numerous variables involved in the design of novel crosslinked siloxane-urethane coatings was carried out using combinatorial methods. Libraries of coatings that explored the effect of siloxane level, solvent, and their variables were prepared and characterized for their surface energy and pseudobarnacle pull-off adhesion. Stability of the coatings was determined by measuring the surface energy after aging the coatings in water and re-measuring the surface energy. Coatings compositions and formulations were identified that had stable hydrophobic surfaces and also had low pseudobarnacle adhesion values.

Supplementary Information

Patent Number: US7989074B2
Application Number: US2007810696A
Inventor: Webster, Dean C. | Pieper, Robert J. | Ekin, Abdullah
Priority Date: 9 Jun 2006
Priority Number: US7989074B2
Application Date: 6 Jun 2007
Publication Date: 2 Aug 2011
IPC Current: C08L008308
US Class: 428447 | 4284231 | 428450 | 525100 | 525102 | 525123 | 525165 | 525185 | 525190 | 525446 | 528038 | 528044 | 528083 | 528085
Assignee Applicant: NDSU Research Foundation,Fargo
Title: Thermoset siloxane-urethane fouling release coatings
Usefulness: Thermoset siloxane-urethane fouling release coatings
Summary: Polymeric material is used as coating for substrate for inhibiting fouling on surface exposed to aquatic condition (both claimed) such as boat hull.
Novelty: Polymeric material used as coating for substrate for inhibiting fouling on surface exposed to aquatic condition, is prepared by reacting mixture comprising amino functional polyorganosiloxane, polyisocyanate, and polyol

Industry

Environmental/Green Technology

Sub Category

Anti-Fouling

*Abstract

The adherence of organisms to surfaces exposed to aquatic environments (fouling) is a major economic concern, particularly in the maritime shipping industry. Fouling on ships can increase fuel consumption by up to 40%. Coatings that prevent fouling currently exist but are an environmental concern due to their release of toxic levels of tin and copper.Scientists at NDSU have invented a novel non-toxic, cross-linked thermoset polysiloxane-polyurethane coating that exhibits properties as foul release (FR) coating and allows organisms to be sloughed off by shear forces obtained at a shipΓÇÖs cruising speed. In addition to exhibiting its fouling release behavior, these coatings have been demonstrated to provide improved durability to its coating surface.

*Principal Investigator

Name: Dean Webster

Department:

Country/Region

USA