Multifunctional smart particles
OwnerXuenjun Zhang, Benjamin Pearmaninventors
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Abstract
The present invention provides multifunctional particulates that release one or more functional compounds in response to environmental triggers and whose external surface modification imparts secondary functionalities to a selected coating composition. For example, disclosed are hydrophobic particles having a smart release mechanism for anticorrosion compounds that release the anticorrosion compounds upon exposure to the local pH changes induced by corrosion processes. Formulations are disclosed for multifunctional smart particles having antimicrobial effects and protections as well.
Claims17
A multifunctional smart particle having an exterior particle surface, composition that comprises:
- core particles comprising dissociable complexes that are within a porous structural matrix at least a portion of whose outer surface has been modified with a hydrophobic compound or an antimicrobial compound;
- wherein said dissociable complexes comprise:
- (i) a first functional agent comprising a complexing agent;
- and (ii) a second functional agent that interacts with said first functional agent to form weakly-bonded complexes comprising non- covalent electrostatic interactions;
- wherein the second functional agent comprises a corrosion inhibitor and/or an antimicrobial agent;
- wherein the first functional agent and the second functional agent are attracted to one another in the weakly-bonded complexes so that a local pH change near said core particles breaks the attraction therebetween and releases the first and second functional agents from said complex;
- wherein said dissociable complex has been made with:
- (a) benzotriazole or benzotriazole-methanol;
- (b) benzisothiazoline;
- (c) 1,3,4-thiadiazole-2,5-dithiol;
- (d) lithium, sodium, or potassium nitrite;
- (e) lithium, sodium, or potassium molybdate;
- or
- (f) polyacrylic acid.
A multifunctional smart particle having a hydrophobic exterior particle surface intended for protection of a metal substrate prone to corrosion, wherein said composition comprises:
- core particles comprising dissociable complexes that are within a porous structural matrix whose outer surface has been modified with a hydrophobic compound;
- wherein said dissociable complexes comprise:
- (i) a first functional agent;
- and (ii) a second functional agent that interacts with said first functional agent to form weakly-bonded complexes comprising non-covalent electrostatic interactions;
- wherein at least one of the first functional agent and the second functional agent comprise (i) a complexing agent and (ii) a corrosion inhibitor and/or an antimicrobial agent;
- wherein the first functional agent and the second functional agent are attracted to one another in the weakly-bonded complexes so that a local pH change due to substrate corrosion near said core particles breaks the attraction between the functional agents and releases the first and second functional agents from said complex;
- wherein said dissociable complex has been made with:
- (a) benzotriazole or benzotriazole-methanol;
- (b) benzisothiazoline;
- (c) 1,3,4-thiadiazole-2,5-dithiol;
- (d) lithium, sodium, or potassium nitrite;
- (e) lithium, sodium, or potassium molybdate;
- or
- (f) polyacrylic acid.
Dependencies are inferred from the claim text.