Solar-radiation-absorbing formulations and related apparatus and methods

摘要

Paint formulations having a high absorptivity with respect to solar radiation are disclosed herein. The disclosed paint formulations are also thermally and mechanically durable, thereby enabling the paint formulations to be used on components in solar thermal applications where exposure to high temperatures and environmental conditions may be an issue. The paint formulation can include an oxide-based pigment, an organic binder, one or more additives, an inorganic filler, and/or an organic solvent. The pigment can have a relatively high absorptivity with respect to light having a wavelength in the range from 250 nm to 3000 nm. Curing of the paint formulation can irreversibly convert the organic binder into an inorganic binder.

主权项

1. A paint formulation comprising:
a) an oxide-based pigment at a concentration between 5% (wt/wt) and 30% (wt/wt), the pigment includes at least one selected from the group consisting of a manganese ferrite black spinel, a chromium cobalt iron black spinel, a copper chromite black spinel, and a nickel iron chromite black spinel; b) an organic binder at a concentration between 10% (wt/wt) and 80% (wt/wt), the binder includes at least one component selected from the group consisting of a methyl polysiloxane, a phenyl polysiloxane, a phenylmethyl silicone resin, and an emulsion of a phenylmethyl polysiloxane resin; c) a boron-based glass additive in the form of particles having a size between 80 μm and 140 μm, and at a concentration between 1% (wt/wt) and 20% (wt/wt), the additive includes at least one component selected from the group consisting of boric acid, boron oxide, metal borides, and boron salts; d) an inorganic filler in the form of particles having a size less than 30 μm, and including at least one component selected from the group consisting of mica, talc, and clay; and e) an organic solvent at a concentration between 10% (wt/wt) and 60% (wt/wt), the solvent including at least one component selected from the group consisting of a glycol ether, an aromatic naphtha solvent, butyl acetate, toluene, and a member of the xylene family,wherein said oxide-based pigment and/or the paint formulation have an absorptivity of at least 70% with respect to light having a wavelength in the range from 250 nm to 3000 nm.