Inkjet decoration of architectural materials
View Patent ↗Embodiments of the invention involve printing a ceramic or metal oxide pigmented ink onto asphalt, bitumen, or rubberoid backed roofing materials. Additionally, embodiments of the invention allow for adhesion of the ink to TPO and PVC roofing substrates.
1. An inkjet ink for coloring architectural substrates, comprising:
30-50% wt. continuous phase consisting of any of fatty acid esters, water, glycol ethers, or hydrocarbons;
20-40% wt. pigment for coloration said pigment comprising an inorganic pigment dispersed in said aliphatic ester, glycol ether, water, or hydrocarbon continuous phase;
1-10% wt. hyperdispersant;
and
a binder which allows the ink to adhere to polyvinyl chloride (PVC) and thermoplastic olefin (TPO) roofing substrates, said binder including any of chlorinated hydrocarbons, chlorinated surfactants, and/or aromatic hydrocarbons, including toluene, alkylated benzenes, and alkylated napthalenes.
2. The ink of claim 1 , said hyperdispersant comprising:
one or more polymeric hyper-dispersants.
3. The ink of claim 1 , said continuous phase comprising:
silanes or aluminates present to achieve stable dispersions and/or substrate binding including any of alkoxy silanes, alkoxy aluminates, calcium aluminates, and colloidal silica.
4. The ink of claim 1 , said binder further comprising:
an inorganic binder to aid adhesion of the pigment to the substrate including any of colloidal silica, silicone derived materials, hydroxylated clays, calcium aluminates, and hydroxylated alumina.
5. The ink of claim 1 , said ink further comprising:
additives to help provide desirable properties for ink-jetting, including viscosity, thermal stability, mechanical stability, said additives including any of modified cellulose derivatives, silicone derived materials, colloidal silicas, clays, and/or surfactants, including quaternary amines, siloxanes surfactants, and fluorinated hydrocarbons.
6. The ink of claim 1 , further comprising;
a geopolymer binder applied to the substrate as any of a component in the ink or as a top-coat to improve light-fastness and long-term weatherability of the printed substrate.
7. The ink of claim 6 , said geopolymer further consisting of any of:
silica-oxide (—Si—O—Si—O—), silicaaluminate (—Si—O—Al—O—), ferro-silica-aluminate (—Fe—O—Si—O—Al—O—) or alumino-phosphate (—Al—O—P—O—), wherein sources of the geopolymer are derived from any of metakaolin, silica materials, and sol-gel derived materials.
8. A method for inkjet application of inorganic pigments to roofing substrates, comprising:
using non-impact inkjet printing methods to apply the inkjet ink of claim 1 to architectural materials.
9. The method of claim 8 , said architectural materials comprising any of:
aggregate/granule coated roofing materials, concrete, stone, and masonry substrates.
10. The method of claim 8 , further comprising;
applying said inkjet ink to said substrate in a predefined pattern.
11. The method of claim 10 , said predefined pattern comprising any of:
woodgrain and stone.
12. The inkjet ink of claim 1 , further comprising: up to 10% wt. geopolymer and/or binder.
13. The inkjet ink of claim 1 , further comprising:
up to 5% wt. surfactants.