US20010022151A1 - Infrared reflective color pigment - Google Patents
Infrared reflective color pigment Download PDFInfo
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- US20010022151A1 US20010022151A1 US09/745,291 US74529100A US2001022151A1 US 20010022151 A1 US20010022151 A1 US 20010022151A1 US 74529100 A US74529100 A US 74529100A US 2001022151 A1 US2001022151 A1 US 2001022151A1
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- 239000000049 pigment Substances 0.000 title claims abstract description 62
- 239000006104 solid solution Substances 0.000 claims abstract description 51
- 229910052595 hematite Inorganic materials 0.000 claims abstract description 34
- 239000011019 hematite Substances 0.000 claims abstract description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 33
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000010936 titanium Substances 0.000 claims abstract description 16
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 16
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 15
- 239000002243 precursor Substances 0.000 claims abstract description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 14
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 13
- 239000011733 molybdenum Substances 0.000 claims abstract description 13
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 10
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 10
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 9
- 239000010941 cobalt Substances 0.000 claims abstract description 9
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 8
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- 229910052779 Neodymium Inorganic materials 0.000 claims abstract description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 5
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 5
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000011777 magnesium Substances 0.000 claims abstract description 5
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 5
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 5
- 229910052718 tin Inorganic materials 0.000 claims abstract description 5
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 claims abstract description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 4
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 4
- 229910052738 indium Inorganic materials 0.000 claims abstract description 4
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 4
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 239000010955 niobium Substances 0.000 claims abstract description 4
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011135 tin Substances 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 4
- 239000011701 zinc Substances 0.000 claims abstract description 4
- 150000001768 cations Chemical class 0.000 claims description 91
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 48
- 239000000843 powder Substances 0.000 claims description 22
- 238000001055 reflectance spectroscopy Methods 0.000 claims description 12
- 239000003086 colorant Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000004566 building material Substances 0.000 claims description 7
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical group C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 6
- 239000002478 γ-tocopherol Substances 0.000 claims description 6
- 239000011449 brick Substances 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims description 2
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims 1
- 238000001354 calcination Methods 0.000 abstract description 11
- 150000001875 compounds Chemical class 0.000 abstract description 8
- 238000002156 mixing Methods 0.000 abstract description 6
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 abstract description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 42
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 30
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 18
- 239000000126 substance Substances 0.000 description 18
- 239000004408 titanium dioxide Substances 0.000 description 18
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 17
- 229910052804 chromium Inorganic materials 0.000 description 16
- 239000011651 chromium Substances 0.000 description 16
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 16
- 239000003973 paint Substances 0.000 description 10
- 238000001228 spectrum Methods 0.000 description 10
- 238000002310 reflectometry Methods 0.000 description 9
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 8
- GEYXPJBPASPPLI-UHFFFAOYSA-N manganese(III) oxide Inorganic materials O=[Mn]O[Mn]=O GEYXPJBPASPPLI-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 235000019804 chlorophyll Nutrition 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 4
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 4
- 239000001023 inorganic pigment Substances 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000007792 addition Methods 0.000 description 3
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(III) oxide Inorganic materials O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 3
- 239000011656 manganese carbonate Substances 0.000 description 3
- 229910000016 manganese(II) carbonate Inorganic materials 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 201000002569 3-methylglutaconic aciduria type 5 Diseases 0.000 description 2
- VCBRBUKGTWLJOB-UHFFFAOYSA-N Chloranocryl Chemical compound CC(=C)C(=O)NC1=CC=C(Cl)C(Cl)=C1 VCBRBUKGTWLJOB-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 2
- 229910003437 indium oxide Inorganic materials 0.000 description 2
- IGUXCTSQIGAGSV-UHFFFAOYSA-K indium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[In+3] IGUXCTSQIGAGSV-UHFFFAOYSA-K 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 229940093474 manganese carbonate Drugs 0.000 description 2
- 235000006748 manganese carbonate Nutrition 0.000 description 2
- TYTHZVVGVFAQHF-UHFFFAOYSA-N manganese(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Mn+3].[Mn+3] TYTHZVVGVFAQHF-UHFFFAOYSA-N 0.000 description 2
- XMWCXZJXESXBBY-UHFFFAOYSA-L manganese(ii) carbonate Chemical compound [Mn+2].[O-]C([O-])=O XMWCXZJXESXBBY-UHFFFAOYSA-L 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 description 2
- 229910000480 nickel oxide Inorganic materials 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910002902 BiFeO3 Inorganic materials 0.000 description 1
- 229910019096 CoTiO3 Inorganic materials 0.000 description 1
- 229910005382 FeSn Inorganic materials 0.000 description 1
- 229910005451 FeTiO3 Inorganic materials 0.000 description 1
- 229910002244 LaAlO3 Inorganic materials 0.000 description 1
- 229910002254 LaCoO3 Inorganic materials 0.000 description 1
- 229910003327 LiNbO3 Inorganic materials 0.000 description 1
- 229910017676 MgTiO3 Inorganic materials 0.000 description 1
- 229910017017 MnSnO3 Inorganic materials 0.000 description 1
- 241000009328 Perro Species 0.000 description 1
- 229910009973 Ti2O3 Inorganic materials 0.000 description 1
- 229910007661 ZnSiO3 Inorganic materials 0.000 description 1
- 229910003122 ZnTiO3 Inorganic materials 0.000 description 1
- YJVBLROMQZEFPA-UHFFFAOYSA-L acid red 26 Chemical compound [Na+].[Na+].CC1=CC(C)=CC=C1N=NC1=C(O)C(S([O-])(=O)=O)=CC2=CC(S([O-])(=O)=O)=CC=C12 YJVBLROMQZEFPA-UHFFFAOYSA-L 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910021502 aluminium hydroxide Inorganic materials 0.000 description 1
- KVLCHQHEQROXGN-UHFFFAOYSA-N aluminium(1+) Chemical compound [Al+] KVLCHQHEQROXGN-UHFFFAOYSA-N 0.000 description 1
- 229940007076 aluminum cation Drugs 0.000 description 1
- -1 aluminum cations Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 229910052810 boron oxide Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052634 enstatite Inorganic materials 0.000 description 1
- QZQVBEXLDFYHSR-UHFFFAOYSA-N gallium(III) oxide Inorganic materials O=[Ga]O[Ga]=O QZQVBEXLDFYHSR-UHFFFAOYSA-N 0.000 description 1
- 229910001679 gibbsite Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- ZMFWDTJZHRDHNW-UHFFFAOYSA-N indium;trihydrate Chemical compound O.O.O.[In] ZMFWDTJZHRDHNW-UHFFFAOYSA-N 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910003455 mixed metal oxide Inorganic materials 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000011027 product recovery Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- GQUJEMVIKWQAEH-UHFFFAOYSA-N titanium(III) oxide Chemical compound O=[Ti]O[Ti]=O GQUJEMVIKWQAEH-UHFFFAOYSA-N 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C3/00—Treatment in general of inorganic materials, other than fibrous fillers, to enhance their pigmenting or filling properties
- C09C3/06—Treatment with inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/34—Compounds of chromium
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/50—Solid solutions
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
- C01P2002/82—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by IR- or Raman-data
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/60—Optical properties, e.g. expressed in CIELAB-values
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
Definitions
- the present invention concerns new solid solutions which are useful as inorganic color pigments. More particularly, the present invention concerns new solid solutions having a corundum-hematite crystalline structure which are useful as inorganic color pigments, some of which exhibit low Y CIE tri-stimulus values and high reflectivity in the near infrared portion of the electromagnetic spectrum.
- Chromium green-black hematite (basic chemical formula: Cr 2 O 3 ) is an inorganic color pigment, C.I. Pigment Green 17, having a corundum-hematite crystalline structure. It is commonly used to impart a green color to ceramics, paints, polymers, and other materials.
- C.I. Pigment Green 17 C.I. Pigment Green 17
- Iron brown hematite (basic chemical formula: Fe 2 O 3 ), is an inorganic pigment, C.I. Pigment Red 101 & 102, having a dark brown to black color and a corundum-hematite crystalline structure. See DCMA Classification and Chemical Description of the Complex Inorganic Color Pigments, Third Addition (1991). It is commonly used to impart dark brown to black color to ceramics, paints, plastics, and other material. Its composition may include any one or a combination of the modifiers Cr 2 O 3 (chrome oxide),, Fe 2 O 3 (iron oxide), Mn 2 O 3 (manganese oxide), or NiO (nickel oxide).
- Chromium green-black hematite is one of the principle pigments used in the manufacture of green shade military camouflage paint and netting.
- chromium green-black hematite is combined with cobalt bearing mixed metal oxides, such as cobalt containing spinel pigment V12600 available from Ferro Corporation of Cleveland, Ohio.
- This combination of pigments is effective in simulating the reflectivity of chlorophyl in the visible portion of the electromagnetic spectrum, being that portion of the spectrum which is viewable by the naked eye with wavelengths ranging from approximately 0.40 ⁇ m to 0.70 ⁇ m.
- Chlorophyl which is an organic pigment, generally exhibits a relatively uniform high degree of reflectivity in the near infrared, being that portion of the electromagnetic spectrum with wavelengths ranging from approximately 0.7 ⁇ m, to 2.5 ⁇ m. Cobalt, however, exhibits a strong absorption band (i.e., low reflectivity) in a portion of the near infrared with wavelengths ranging from approximately 1.2 ⁇ m to 1.6 ⁇ m.
- a substitute military green shade camouflage pigment which contains no cobalt and which closely matches the reflectivity of chlorophyl in the visible and near infrared is therefore highly desired.
- a substitute green shade camouflage pigment would have to exhibit a dark drab green appearance in the visible portion of the spectrum and would also have to simulate the reflectance curve for chlorophyl in the near infrared.
- known inorganic pigments which exhibit a low degree of reflectivity in the visible portion of the light spectrum i.e., dark drab colored pigments
- the present invention provides new solid solutions having a corundum-hematite crystalline structure which are useful as inorganic color pigments.
- Solid solutions according to the present invention are comprised of a host component having a corundum-hematite crystalline structure which contains as a guest component one or more elements from the group consisting of aluminum, antimony, bismuth, boron, chrome, cobalt, gallium, indium, iron, lanthanum, lithium, magnesium, manganese, molybdenum, neodymium, nickel, niobium, silicon, tin, titanium, vanadium, and zinc.
- Solid solutions according to the present invention are formed by thoroughly mixing compounds, usually metal oxides or precursors thereof, which contain the host and guest components and then calcining the compounds to form the solid solutions having the corundum-hematite crystalline structure.
- Some of the new solid solutions according to the present invention such as for example chrome oxide as a host component containing the elements iron, boron, and titanium as guest components, exhibit dark drab colors in the visible and high reflectivity in the near infrared portions of the electromagnetic spectrum.
- One of the primary uses for new solid solutions having these properties would be as inorganic color pigments in military camouflage paint or netting applications, which would permit the radiation signature of a painted or covered object to be tailored to match the reflectance curve of the background foliage in the visible and near infrared portions of the electromagnetic spectrum. Because many of these new solid solutions exhibit relatively high near infrared reflectance, they would also be suitable for use in the general paint and polymer markets, most specifically for architectural applications where increased near infrared reflectance would result in lower heat build-up and thus lower energy costs.
- FIG. 1 is a graph showing percent reflectance at wavelengths ranging from 0.6 ⁇ m to 2.5 ⁇ m for the infrared reflective color pigments embodied in Examples 1, 6, and 7 herein as compared to a standard chromium green-black hematite pigment.
- FIG. 2 is a graph showing percent reflectance at wavelengths ranging from 0.6 ⁇ m to 2.5 ⁇ m for the infrared reflective color pigments embodied in Examples 3, 4, and 5 herein as compared to a standard chromium green-black hematite pigment.
- FIG. 3 is a graph showing percent reflectance at wavelengths ranging from 0.6 ⁇ m to 2.5 ⁇ m for the infrared reflective color pigments embodied in Examples 8, 10, and 11 herein as compared to a standard chromium green-black hematite pigment.
- FIG. 4 is a graph showing Y CIE tri-stimulus values and percent reflectance as measured at a wavelength of 2.5 ⁇ m for the infrared reflective color pigments embodied in Examples 1 through 16 herein as compared to a standard chromium green-black hematite pigment.
- solid solutions having a corundum-hematite crystalline structure can be obtained by using metal oxides, or precursors thereof, which form corundum-hematite lattices as host components and incorporating into them as guest components such metal oxides, or precursors thereof, the cations of which possess radii which are comparable with the radii of the metal ions, or the statistical mean of the radii of the metal ions of the host components.
- the guest components are incorporated in such proportions relative to one another that the ratio of the sum of the added cations to the sum of the added anions, while preserving statistical electro-neutrality in the lattice, is substantially 2:3.
- the total proportion of the guest components may be of any value, but the amount is preferably not greater than approximately the total amount of the host components.
- these additions can be considered in a manner similar to the Hund crystalline solid solution patents, U.S. Pat. Nos. 3,022,186, 3,091,544, and 4,285,726, the specifications of which are hereby incorporated by reference.
- guest components or dopants can be added to the host component or crystalline lattice as long as the crystalline structure, charge, and cation sites of the host component are substantially conserved.
- Table 1 below sets forth some of the various compounds which have a corundum-hematite crystalline structure and comparable lattice constant ranges so as to be capable of forming solid solutions according to the present invention: TABLE 1 Representative Corundum-Hematite Crystalline Lattice Constants Formula A C JCPDS Card Number Cr 2 O 3 4.958 ⁇ 13.593 ⁇ 38-1479 Al 2 O 3 4.758 ⁇ 12.991 ⁇ 10-173 V 2 O 3 4.920 ⁇ 13.883 ⁇ 34-187 Ga 2 O 3 4.979 ⁇ 13.429 ⁇ 6-503 Fe 2 O 3 5.036 ⁇ 13.749 ⁇ 33-664 Mn 2 O 3 5.04 ⁇ 14.12 ⁇ 33-900 Ti 2 O 3 5.139 ⁇ 13.659 ⁇ 10-63 In 2 O 3 5.49 ⁇ 14.52 ⁇ 22-336 TiBO 3 4.67 ⁇ 14.90 ⁇ 17-310 NiTiO 3 5.032 ⁇ 13.791 ⁇ 33-961 MgTiO 3 5.054 ⁇ 13.898 ⁇ 6-494 CoTiO 3 5.068 ⁇ 13.922 ⁇
- Table 1 does not contain all of the possible compounds that can form solid solutions according to the present invention.
- molybdenum can be incorporated as a guest component into a chrome oxide host according to the present invention.
- CrMoO 3 would exist and be similar in crystal structure to FeMoO 3 , although CrMoO 3 is not shown in Table 1.
- Solid solutions according to the present invention are comprised of a host component having a corundum-hematite crystalline structure which contain as a guest component one or more elements from the group consisting of aluminum, antimony, bismuth, boron, chrome, cobalt, gallium, indium, iron, lanthanum, lithium, magnesium, manganese, molybdenum, neodymium, nickel, niobium, silicon, tin, titanium, vanadium, and zinc.
- a host component having a corundum-hematite crystalline structure which contain as a guest component one or more elements from the group consisting of aluminum, antimony, bismuth, boron, chrome, cobalt, gallium, indium, iron, lanthanum, lithium, magnesium, manganese, molybdenum, neodymium, nickel, niobium, silicon, tin, titanium, vanadium, and zinc.
- Solid solutions according to the present invention are prepared by thoroughly dry or wet mixing compounds containing the host and guest components and then calcining the components to form a solid solution.
- the host and guest components will both comprise metal oxides.
- precursors thereof, meaning compounds which at the calcining temperature are converted in the presence of an oxidizing atmosphere into metal oxides can also be used.
- Such precursors include, for example: aluminum hydrate (basic chemical formula: Al(OH) 3 )) which can be used as a precursor for aluminum oxide; manganese carbonate (basic chemical formula: MnCO 3 ) which can be used as a precursor for manganese sesquioxide (basic chemical formula: Mn 2 O 3 ); and indium hydroxide (basic chemical formula: In(OH) 3 ) which can be used as a precursor for indium oxide (basic chemical formula: In 2 O 3 ).
- aluminum hydrate basic chemical formula: Al(OH) 3
- MnCO 3 manganese carbonate
- Mn 2 O 3 manganese sesquioxide
- indium hydroxide basic chemical formula: In(OH) 3
- the host and guest components are preferably milled to a fine powder and then thoroughly mixed in the appropriate proportions. Milling fineness is not critical, but average particle size diameters from approximately 0.2 ⁇ m to about 5 ⁇ m are preferred. Standard pigment grade metal oxide powders and precursors currently available on the market can generally be used without additional milling prior to mixing. Mixing can occur in a dry state, or the powders can be mixed in solution, dried, and then milled again if necessary to break up any particle agglomerations. The mixture is then calcined to form crystalline solid solutions. Calcination can be achieved in a standard refractory sagger, kiln, or other suitable device to form the solid solutions.
- Calcination can also be achieved through the use of a rotary calciner. Calcination sufficient to form solid solutions generally occurs at a temperature of from about 1,750° F. to about 2,250° F. for about 0.5 to about 24 hours. However, it will be understood to those practicing the invention that a wide range of calcination temperatures and times can be used, and that so long as the temperature and length of time used is sufficient to form the solid solutions according to the present invention, the temperature and length of time of calcination is not per se critical.
- FIG. 1 is a graph showing percent reflectance at wavelengths ranging from 0.6 ⁇ m to 2.5 ⁇ m for infrared reflective color pigments prepared as described in Examples 1, 6, and 7 above as compared to a standard chromium green-black hematite pigment available as G-4099 from Elementis Pigments, Inc. of Fairview Heights, Ill. Percent reflectance measurements were made on neat pressed cup powder samples using a Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory.
- FIG. 1 shows that some of the infrared reflective color pigments according to the present invention exhibit significantly higher near infrared reflectance than known chromium green-black hematite pigments.
- FIG. 1 also shows that elements such as silicon and tin can be substituted for titanium in the crystal lattice structure of pigments according to the present invention.
- FIG. 2 is a graph showing percent reflectance at wavelengths ranging from 0.6 ⁇ m to 2.5 ⁇ m for infrared reflective color pigments prepared as described in Examples 3, 4, and 5 above as compared a standard chromium green-black hematite pigment available as G-4099 from Elementis Pigments, Inc. of Fairview Heights, Ill. Percent reflectance measurements were made on neat pressed cup powder samples using a Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory.
- FIG. 3 is a graph showing percent reflectance at wavelengths ranging from 0.6 ⁇ m to 2.5 ⁇ m for infrared reflective color pigments prepared as described in Examples 8, 10, and 11 above as compared to a standard chromium green-black hematite pigment available as G-4099 from Elementis Pigments, Inc. of Fairview Heights, Ill. Percent reflectance measurements were made on neat pressed cup powder samples using a Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory.
- FIG. 1 Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory.
- FIG. 4 is a graph showing Y CIE tri-stimulus values versus percent reflectance measured at a wavelength of 2.5 ⁇ m for the infrared reflective color pigments prepared as described in Examples 1 through 16 above as compared to a standard chromium green-black hematite pigment available as G-4099 from Elementis Pigments, Inc. of Fairview Heights, Ill.
- Y CIE tri-stimulus values were measured on neat pressed cup powder samples using a Diano Matchscan II Spectrophotometer using a 1931 CIE 2 degree observer with a C Illuminant in accordance with the procedures set forth in ASTM Standard E308 (1996), Standard Practice for Computing the Colors of Objects by Using the CIE System, the text of which can be purchased from the American Society for Testing and Materials of West Conshohocken, Pa.
- Percent reflectance measurements were made on neat pressed cup powder samples using a Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory.
- Y CIE tri-stimulus value refers to the lightness or darkness of a color, with a lower Y CIE tri-stimulus value correlating with a darker color.
- Table 2 lists the Y CIE tri-stimulus values, x and y CIE chromaticity coordinates, and percent reflectance at various wavelengths in the near infrared spectrum for the solid solutions embodied in Examples 1 through 16 as compared to a standard chromium green-black hematite pigment available as G-4099 from Elementis Pigments, Inc. of Fairview Heights, Ill.
- Y CIE tri-stimulus values and x and y CIE chromaticity coordinates were measured on neat pressed cup powder samples using a Diano Matchscan II Spectrophotometer using a 1931 CIE 2 degree observer with a C Illuminant in accordance with the procedures set forth in ASTM Standard E308 (1996), Standard Practice for Computing the Colors of Objects by Using the CIE System, the text of which can be purchased from the American Society for Testing and Materials of West Conshohocken, Pa.
- Percent reflectance measurements were made on neat pressed cup powder samples using a Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory.
- Table 3 lists the Y CIE tri-stimulus values, x and y CIE chromaticity coordinates, and percent reflectance at various wavelengths in the near infrared spectrum for the solid solutions embodied in Examples 17 through 21 as compared to a standard red hematite pigment available as R03097 from Harcross Pigments, Inc. of Easton, Pa.
- Y CIE tri-stimulus values and x and y CIE chromaticity coordinates were measured on neat pressed cup powder samples using a Diano Matchscan II Spectrophotometer using a 1931 CIE 2 degree observer with a C Illuminant accordance with the procedures set forth in ASTM Standard E308 (1996), Standard Practice for Computing the Colors of Objects by Using the CIE System, the test of which can be purchased from the American Society for Testing and Materials of West Conshohocken, Pa.
- Percent reflectance measurements were made on neat pressed cup powder samples using a Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory.
- One of the primary uses for new solid solutions according to the present invention which exhibit relatively low Y CIE tri-stimulus values and relatively high near infrared reflectance would be as inorganic pigments in military camouflage paint or netting applications.
- these pigments in place of known pigments which contain cobalt, the radiation signature of a camouflage painted or covered object can be tailored to match the background in the visible and near infrared portions of the electromagnetic spectrum.
- pigments according to the present invention are particularly useful in building material applications where heat reduction is desirable such as, for example, stucco, paint, vinyl siding, roofing tiles, roofing granules, roofing shingles, and brick.
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Abstract
Description
- This is a continuation-in-part of application Ser. No. 09/178,957, filed Oct. 26, 1998.
- The present invention concerns new solid solutions which are useful as inorganic color pigments. More particularly, the present invention concerns new solid solutions having a corundum-hematite crystalline structure which are useful as inorganic color pigments, some of which exhibit low Y CIE tri-stimulus values and high reflectivity in the near infrared portion of the electromagnetic spectrum.
- Chromium green-black hematite (basic chemical formula: Cr2O3) is an inorganic color pigment, C.I. Pigment Green 17, having a corundum-hematite crystalline structure. It is commonly used to impart a green color to ceramics, paints, polymers, and other materials. The DCMA Classification and Chemical Description of the Complex Inorganic Color Pigments, Third Addition (1991), published by the Dry Color Manufacturer's Association, states that its composition may include any one or a combination of the modifiers Al2O3 (alumina), Fe2O3 (iron oxide), or Mn2O3 (manganese oxide).
- Iron brown hematite (basic chemical formula: Fe2O3), is an inorganic pigment, C.I. Pigment Red 101 & 102, having a dark brown to black color and a corundum-hematite crystalline structure. See DCMA Classification and Chemical Description of the Complex Inorganic Color Pigments, Third Addition (1991). It is commonly used to impart dark brown to black color to ceramics, paints, plastics, and other material. Its composition may include any one or a combination of the modifiers Cr2O3 (chrome oxide),, Fe2O3 (iron oxide), Mn2O3 (manganese oxide), or NiO (nickel oxide).
- Chromium green-black hematite is one of the principle pigments used in the manufacture of green shade military camouflage paint and netting. In such applications, chromium green-black hematite is combined with cobalt bearing mixed metal oxides, such as cobalt containing spinel pigment V12600 available from Ferro Corporation of Cleveland, Ohio. This combination of pigments is effective in simulating the reflectivity of chlorophyl in the visible portion of the electromagnetic spectrum, being that portion of the spectrum which is viewable by the naked eye with wavelengths ranging from approximately 0.40 μm to 0.70 μm.
- Chlorophyl, which is an organic pigment, generally exhibits a relatively uniform high degree of reflectivity in the near infrared, being that portion of the electromagnetic spectrum with wavelengths ranging from approximately 0.7 μm, to 2.5 μm. Cobalt, however, exhibits a strong absorption band (i.e., low reflectivity) in a portion of the near infrared with wavelengths ranging from approximately 1.2 μm to 1.6 μm. In recent years, advancements in imaging technology have made it possible to contrast known military green shade camouflage painted or covered objects from the background foliage in that portion of the near infrared. A substitute military green shade camouflage pigment which contains no cobalt and which closely matches the reflectivity of chlorophyl in the visible and near infrared is therefore highly desired.
- In order to satisfy military specifications, a substitute green shade camouflage pigment would have to exhibit a dark drab green appearance in the visible portion of the spectrum and would also have to simulate the reflectance curve for chlorophyl in the near infrared. Generally speaking, known inorganic pigments which exhibit a low degree of reflectivity in the visible portion of the light spectrum (i.e., dark drab colored pigments) also tend to exhibit a correspondingly low degree of reflectivity (i.e., high absorption) in other portions of the light spectrum, including the near infrared. A chromium green-black hematite pigment manufactured by Bayer Corporation of Germany, product number AC 5303, was observed to exhibit a higher near infrared reflectance than other chromium green-black hematite sources (this pigment, however, does not have the desired dark drab appearance in the visible spectrum required for military green shade camouflage paint applications). It was found by chemical analysis that this pigment contained both alumina and titania (basic chemical formula: TiO2) as minor additives. A search failed to disclose any references teaching the use of alumina and titania to improve the near infrared reflectance of chromium green-black hematite pigments.
- The present invention provides new solid solutions having a corundum-hematite crystalline structure which are useful as inorganic color pigments. Solid solutions according to the present invention are comprised of a host component having a corundum-hematite crystalline structure which contains as a guest component one or more elements from the group consisting of aluminum, antimony, bismuth, boron, chrome, cobalt, gallium, indium, iron, lanthanum, lithium, magnesium, manganese, molybdenum, neodymium, nickel, niobium, silicon, tin, titanium, vanadium, and zinc. Solid solutions according to the present invention are formed by thoroughly mixing compounds, usually metal oxides or precursors thereof, which contain the host and guest components and then calcining the compounds to form the solid solutions having the corundum-hematite crystalline structure.
- Some of the new solid solutions according to the present invention, such as for example chrome oxide as a host component containing the elements iron, boron, and titanium as guest components, exhibit dark drab colors in the visible and high reflectivity in the near infrared portions of the electromagnetic spectrum. One of the primary uses for new solid solutions having these properties would be as inorganic color pigments in military camouflage paint or netting applications, which would permit the radiation signature of a painted or covered object to be tailored to match the reflectance curve of the background foliage in the visible and near infrared portions of the electromagnetic spectrum. Because many of these new solid solutions exhibit relatively high near infrared reflectance, they would also be suitable for use in the general paint and polymer markets, most specifically for architectural applications where increased near infrared reflectance would result in lower heat build-up and thus lower energy costs.
- The foregoing and other features of the invention are hereinafter more fully described and particularly pointed out in the claims, the following description setting forth in detail certain illustrative embodiments of the invention, these being indicative, however, of but a few of the various ways in which the principles of the present invention may be employed.
- FIG. 1 is a graph showing percent reflectance at wavelengths ranging from 0.6 μm to 2.5 μm for the infrared reflective color pigments embodied in Examples 1, 6, and 7 herein as compared to a standard chromium green-black hematite pigment.
- FIG. 2 is a graph showing percent reflectance at wavelengths ranging from 0.6 μm to 2.5 μm for the infrared reflective color pigments embodied in Examples 3, 4, and 5 herein as compared to a standard chromium green-black hematite pigment.
- FIG. 3 is a graph showing percent reflectance at wavelengths ranging from 0.6 μm to 2.5 μm for the infrared reflective color pigments embodied in Examples 8, 10, and 11 herein as compared to a standard chromium green-black hematite pigment.
- FIG. 4 is a graph showing Y CIE tri-stimulus values and percent reflectance as measured at a wavelength of 2.5 μm for the infrared reflective color pigments embodied in Examples 1 through 16 herein as compared to a standard chromium green-black hematite pigment.
- In accordance with the present invention, solid solutions having a corundum-hematite crystalline structure can be obtained by using metal oxides, or precursors thereof, which form corundum-hematite lattices as host components and incorporating into them as guest components such metal oxides, or precursors thereof, the cations of which possess radii which are comparable with the radii of the metal ions, or the statistical mean of the radii of the metal ions of the host components. The guest components are incorporated in such proportions relative to one another that the ratio of the sum of the added cations to the sum of the added anions, while preserving statistical electro-neutrality in the lattice, is substantially 2:3. The total proportion of the guest components may be of any value, but the amount is preferably not greater than approximately the total amount of the host components. Conceptually, these additions can be considered in a manner similar to the Hund crystalline solid solution patents, U.S. Pat. Nos. 3,022,186, 3,091,544, and 4,285,726, the specifications of which are hereby incorporated by reference. Essentially, guest components or dopants can be added to the host component or crystalline lattice as long as the crystalline structure, charge, and cation sites of the host component are substantially conserved.
- Table 1 below sets forth some of the various compounds which have a corundum-hematite crystalline structure and comparable lattice constant ranges so as to be capable of forming solid solutions according to the present invention:
TABLE 1 Representative Corundum-Hematite Crystalline Lattice Constants Formula A C JCPDS Card Number Cr2O3 4.958Å 13.593Å 38-1479 Al2O3 4.758Å 12.991Å 10-173 V2O3 4.920Å 13.883Å 34-187 Ga2O3 4.979Å 13.429Å 6-503 Fe2O3 5.036Å 13.749Å 33-664 Mn2O3 5.04Å 14.12Å 33-900 Ti2O3 5.139Å 13.659Å 10-63 In2O3 5.49Å 14.52Å 22-336 TiBO3 4.67Å 14.90Å 17-310 NiTiO3 5.032Å 13.791Å 33-961 MgTiO3 5.054Å 13.898Å 6-494 CoTiO3 5.068Å 13.922Å 15-866 ZnTiO3 5.078Å 13.927Å 25-1500 FeTiO3 5.088Å 14.093Å 29-733 MnTiO3 5.140Å 14.290Å 29-902 CrBO3 4.578Å 14.260Å 15-663 NiCrO3 4.925Å 13.504Å 22-748 FeBO3 4.613Å 14.470Å 21-423 FeMoO3 4.67Å 15.03Å 19-611 FeSn(BO3)2 4.733Å 15.08Å 18-657 BiFeO3 5.57Å 13.84Å 20-169 AlBO3 4.463Å 13.746Å 32-4 Mg3Al2Si3O12 4.755Å 13.360Å 30-788 NdAlO3 5.326Å 12.920Å 29-57 LaAlO3 5.344Å 13.110Å 31-22 MnSnO3 5.358Å 14.505Å 33-913 LiNbO3 5.149Å 13.862Å 20-631 LaCoO3 5.441Å 13.088Å 25-1060 MgSiO3 4.725Å 13.563Å 39-300 ZnSiO3 4.746Å 13.755Å 34-575 Mn(Sb,Fe)O3 5.226Å 14.325Å 20-699 - It should be noted that Table 1 does not contain all of the possible compounds that can form solid solutions according to the present invention. For example, molybdenum can be incorporated as a guest component into a chrome oxide host according to the present invention. One would reasonably expect that since iron and chrome have lattice constants which are very close, and both form extensive solid solutions, CrMoO3 would exist and be similar in crystal structure to FeMoO3, although CrMoO3 is not shown in Table 1. Solid solutions according to the present invention, irrespective of whether shown on Table 1, are comprised of a host component having a corundum-hematite crystalline structure which contain as a guest component one or more elements from the group consisting of aluminum, antimony, bismuth, boron, chrome, cobalt, gallium, indium, iron, lanthanum, lithium, magnesium, manganese, molybdenum, neodymium, nickel, niobium, silicon, tin, titanium, vanadium, and zinc.
- Solid solutions according to the present invention are prepared by thoroughly dry or wet mixing compounds containing the host and guest components and then calcining the components to form a solid solution. Generally, the host and guest components will both comprise metal oxides. However, precursors thereof, meaning compounds which at the calcining temperature are converted in the presence of an oxidizing atmosphere into metal oxides can also be used. Such precursors include, for example: aluminum hydrate (basic chemical formula: Al(OH)3)) which can be used as a precursor for aluminum oxide; manganese carbonate (basic chemical formula: MnCO3) which can be used as a precursor for manganese sesquioxide (basic chemical formula: Mn2O3); and indium hydroxide (basic chemical formula: In(OH)3) which can be used as a precursor for indium oxide (basic chemical formula: In2O3). It will be appreciated that a wide variety of precursors can be used to practice the invention, and that the selection of precursors is not per se critical.
- The host and guest components are preferably milled to a fine powder and then thoroughly mixed in the appropriate proportions. Milling fineness is not critical, but average particle size diameters from approximately 0.2 μm to about 5 μm are preferred. Standard pigment grade metal oxide powders and precursors currently available on the market can generally be used without additional milling prior to mixing. Mixing can occur in a dry state, or the powders can be mixed in solution, dried, and then milled again if necessary to break up any particle agglomerations. The mixture is then calcined to form crystalline solid solutions. Calcination can be achieved in a standard refractory sagger, kiln, or other suitable device to form the solid solutions. Calcination can also be achieved through the use of a rotary calciner. Calcination sufficient to form solid solutions generally occurs at a temperature of from about 1,750° F. to about 2,250° F. for about 0.5 to about 24 hours. However, it will be understood to those practicing the invention that a wide range of calcination temperatures and times can be used, and that so long as the temperature and length of time used is sufficient to form the solid solutions according to the present invention, the temperature and length of time of calcination is not per se critical.
- In most instances, it is unnecessary to mill or grind solid solutions formed according to the present invention after calcination. However, when a smaller average particle size is desired or when a particular application requires a strict avoidance of minor particle agglomerations, additional milling or grinding of the solid solutions can be performed.
- It should be apparent to those skilled in the art that the method of the present invention can be practiced to manufacture a wide variety of solid solutions having utility as inorganic pigments for use in ceramics, polymers, paints, and other materials. The selection of guest and host components used to form solid solutions can readily be made within the total specification disclosure. In similar fashion, it is to be appreciated that the process steps of the method, including mixing, calcination, and product recovery, are generally conventional and thus can be readily determined by those skilled in the art.
- The following examples are intended to illustrate the invention without limiting it in any way. All raw materials referenced in the examples are standard pigment grade powders unless otherwise indicated.
- 93.46 grams chrome oxide, 0.94 grams iron oxide, 2.38 grams aluminum oxide from aluminum hydrate and 1.88 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 93.02 grams chrome oxide, 0.93 grams iron oxide, 3.35 grams aluminum oxide from aluminum hydrate and 0.83 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 93.23 grams chrome oxide, 0.92 grams iron oxide, 0.43 grams molybdenum trioxide (basic chemical formula: MoO3), 3.11 grams aluminum oxide from aluminum hydrate and 0.57 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 95.49 grams chrome oxide, 0.96 grams iron oxide, 1.63 grams boron oxide (basic chemical formula: B2O3) and 1.92 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 86.79 grams chrome oxide, 0.96 grams iron oxide, 10.59 grams bismuth trioxide (basic chemical formula: Bi2O3) and 1.75 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 91.86 grams chrome oxide, 0.92 grams iron oxide, 2.42 grams aluminum oxide from aluminum hydrate and 3.56 grams tin oxide (basic chemical formula: SnO) were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 93.87 grams chrome oxide, 0.94 grams iron oxide, 2.39 grams aluminum oxide from aluminum hydrate and 1.45 grams silicon dioxide (basic chemical formula: SiO2) were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 93.05 grams chrome oxide, 0.93 grams manganese sesquioxide from manganese carbonate, 2.68 grams aluminum oxide from aluminum hydrate and 1.39 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 89.96 grams chrome oxide, 0.90 grams iron oxide, 6.13 grams indium oxide from indium hydroxide and 1.81 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 90.06 grams chrome oxide, 0.91 grams iron oxide, 7.22 grams lanthanum oxide (basic chemical formula: La2O3) and 1.81 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 89.85 grams chrome oxide, 0.90 grams iron oxide, 7.44 grams neodymium oxide (basic chemical formula: Nd2(SO4)3) and 1.81 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 95.08 grams chrome oxide, 0.96 grams iron oxide, 2.50 grams aluminum oxide from aluminum hydrate and 0.06 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 79.36 grams chrome oxide, 0.80 grams iron oxide, 9.98 grams aluminum oxide from aluminum hydrate and 4.27 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 99.06 grams chrome oxide and 0.94 grams iron oxide were thoroughly mixed in a Waring blender and calcined in a crucible at 2,000° F. for three hours.
- 93.15 grams chrome oxide, 0.88 grams iron oxide, 3.06 grams aluminum oxide from aluminum hydrate and 1.19 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 1,850° F. for three hours.
- 48.46 grams chrome oxide, 48.46 grams iron oxide, 1.58 grams aluminum oxide from aluminum hydrate and 0.61 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined in a crucible at 1,850° F. for three hours.
- FIG. 1 is a graph showing percent reflectance at wavelengths ranging from 0.6 μm to 2.5 μm for infrared reflective color pigments prepared as described in Examples 1, 6, and 7 above as compared to a standard chromium green-black hematite pigment available as G-4099 from Elementis Pigments, Inc. of Fairview Heights, Ill. Percent reflectance measurements were made on neat pressed cup powder samples using a
Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory. FIG. 1 shows that some of the infrared reflective color pigments according to the present invention exhibit significantly higher near infrared reflectance than known chromium green-black hematite pigments. FIG. 1 also shows that elements such as silicon and tin can be substituted for titanium in the crystal lattice structure of pigments according to the present invention. - FIG. 2 is a graph showing percent reflectance at wavelengths ranging from 0.6 μm to 2.5 μm for infrared reflective color pigments prepared as described in Examples 3, 4, and 5 above as compared a standard chromium green-black hematite pigment available as G-4099 from Elementis Pigments, Inc. of Fairview Heights, Ill. Percent reflectance measurements were made on neat pressed cup powder samples using a
Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory. FIG. 2 shows that elements such as bismuth, boron, and molybdenum can be substituted for the aluminum cation in the crystal lattice structure of pigments according to the present invention, allowing for adjustments of the visible color while retaining the preferable high near infrared reflectance. - FIG. 3 is a graph showing percent reflectance at wavelengths ranging from 0.6 μm to 2.5 μm for infrared reflective color pigments prepared as described in Examples 8, 10, and 11 above as compared to a standard chromium green-black hematite pigment available as G-4099 from Elementis Pigments, Inc. of Fairview Heights, Ill. Percent reflectance measurements were made on neat pressed cup powder samples using a
Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory. FIG. 3 shows that elements such as manganese, lanthanum, and neodymium can be substituted for the iron or aluminum cations in the crystal lattice structure of pigments according to the present invention, allowing for adjustments of the visible color while retaining the preferable high near infrared reflectance. By adjusting the quantity and identity of the combinations of cations in crystalline lattice structure in pigments according to the present invention, a wide range of colors can be produced. - FIG. 4 is a graph showing Y CIE tri-stimulus values versus percent reflectance measured at a wavelength of 2.5 μm for the infrared reflective color pigments prepared as described in Examples 1 through 16 above as compared to a standard chromium green-black hematite pigment available as G-4099 from Elementis Pigments, Inc. of Fairview Heights, Ill. Y CIE tri-stimulus values were measured on neat pressed cup powder samples using a Diano Matchscan II Spectrophotometer using a 1931 CIE 2 degree observer with a C Illuminant in accordance with the procedures set forth in ASTM Standard E308 (1996), Standard Practice for Computing the Colors of Objects by Using the CIE System, the text of which can be purchased from the American Society for Testing and Materials of West Conshohocken, Pa. Percent reflectance measurements were made on neat pressed cup powder samples using a
Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory. FIG. 4 shows that some of the new solid solutions according to the present invention, such as those embodied in Examples 1, 3, 4, 8, 10, 11, 13, and 16, exhibit relatively low Y CIE tri-stimulus values (13.53 or less) and relatively high near infrared reflectance at 2.5 μm (71.7% or higher). Generally speaking, the Y CIE tri-stimulus value refers to the lightness or darkness of a color, with a lower Y CIE tri-stimulus value correlating with a darker color. - Table 2 below lists the Y CIE tri-stimulus values, x and y CIE chromaticity coordinates, and percent reflectance at various wavelengths in the near infrared spectrum for the solid solutions embodied in Examples 1 through 16 as compared to a standard chromium green-black hematite pigment available as G-4099 from Elementis Pigments, Inc. of Fairview Heights, Ill. Y CIE tri-stimulus values and x and y CIE chromaticity coordinates were measured on neat pressed cup powder samples using a Diano Matchscan II Spectrophotometer using a 1931 CIE 2 degree observer with a C Illuminant in accordance with the procedures set forth in ASTM Standard E308 (1996), Standard Practice for Computing the Colors of Objects by Using the CIE System, the text of which can be purchased from the American Society for Testing and Materials of West Conshohocken, Pa. Percent reflectance measurements were made on neat pressed cup powder samples using a
Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory.TABLE 2 Color and % IR Reflectance (Pressed Cups) Example Y x y 0.72 μm 0.80 μm 0.90 μm 1.0 μm 1.5 μm 2.5 μm Standard 20.33 .315 .409 35.0 59.6 58.9 57.4 55.0 56.0 1 11.91 .328 .378 25.0 57.0 67.8 66.2 72.0 78.0 2 15.99 .331 .406 24.2 59.6 71.3 69.0 73.9 76.3 3 12.61 .333 .391 28.6 66.5 79.1 76.2 84.2 88.5 4 10.77 .323 .372 23.8 62.2 74.8 73.0 77.4 87.3 5 12.64 .332 .386 27.0 59.3 66.2 64.3 64.3 74.8 6 16.53 .326 .399 33.3 63.1 67.2 66.0 67.7 71.9 7 16.81 .326 .402 32.8 59.0 61.9 60.6 59.4 61.5 8 10.71 .321 .374 21.5 50.5 68.3 74.8 76.0 81.0 9 12.04 .331 .379 25.5 57.2 63.8 61.1 60.9 75.0 10 11.50 .330 .376 25.2 60.0 68.0 66.2 70.0 81.4 11 11.10 .326 .368 24.0 58.1 70.0 69.2 75.2 80.0 12 14.28 .330 .405 29.7 56.1 59.5 58.1 57.0 58.0 13 13.53 .334 .398 31.6 64.1 72.7 70.0 71.2 83.2 14 15.35 .334 .408 27.4 59.2 62.1 61.0 60.0 65.0 15 14.82 .330 .403 30.6 60.1 67.2 65.5 69.9 75.4 16 6.43 .328 .325 11.6 22.1 34.5 37.0 63.6 71.7 - 36.14 grams chrome oxide, 60.32 grams iron oxide, 1.61 grams of aluminum oxide from aluminum hydrate, 0.62 grams titanium dioxide and 0.40 grams molybdic oxide were thoroughly mixed in a Waring blender and calcined at 1750° F. for seven hours.
- 32.32 grams chrome oxide, 64.48 grams iron oxide, 1.44 grams of aluminum oxide from aluminum hydrate, 0.56 grams titanium dioxide and 0.40 grams molybdic oxide were thoroughly mixed in a Waring blender and calcined at 1750° F. for seven hours.
- 19.48 grams chrome oxide, 77.94 grams iron oxide, 1.12 grams of aluminum oxide from aluminum hydrate, 0.44 grams titanium dioxide and 0.40 grams molybdic oxide were thoroughly mixed in a Waring blender and calcined at 1900° F. for seven hours.
- 4.95 grams chrome oxide, 94.10 grams iron oxide, 0.28 grams of aluminum oxide from aluminum hydrate, 0.11 grams titanium dioxide and 0.40 grams molybdic oxide were thoroughly mixed in a Waring blender and calcined at 1900° F. for seven hours.
- 23.38 grams chrome oxide, 76.05 grams iron oxide, 0.24 grams of aluminum oxide from aluminum hydrate and 0.20 grams titanium dioxide were thoroughly mixed in a Waring blender and calcined at 1700 EF for four hours.
- Table 3 below lists the Y CIE tri-stimulus values, x and y CIE chromaticity coordinates, and percent reflectance at various wavelengths in the near infrared spectrum for the solid solutions embodied in Examples 17 through 21 as compared to a standard red hematite pigment available as R03097 from Harcross Pigments, Inc. of Easton, Pa. Y CIE tri-stimulus values and x and y CIE chromaticity coordinates were measured on neat pressed cup powder samples using a Diano Matchscan II Spectrophotometer using a 1931 CIE 2 degree observer with a C Illuminant accordance with the procedures set forth in ASTM Standard E308 (1996), Standard Practice for Computing the Colors of Objects by Using the CIE System, the test of which can be purchased from the American Society for Testing and Materials of West Conshohocken, Pa. Percent reflectance measurements were made on neat pressed cup powder samples using a
Perkin Lambda 19 Spectrophotometer equipped with a Labsphere RSA-PE-19 reflectance spectroscopy accessory.TABLE 3 Color and % IR Reflectance (Pressed Cups) Example Y x y 0.72 μm 0.80 μm 0.90 μm 1.0 μm 1.5 μm 2.5 μm Standard 11.64 .450 .342 36.3 27.0 28.4 43.1 44.5 28.6 17 8.31 .319 .320 15.3 17.8 26.2 27.2 56.8 64.3 18 6.66 .329 .316 12.1 19.9 26.9 32.4 73.1 71.6 19 9.27 .308 .312 11.4 16.2 21.1 29.8 59.0 68.8 20 10.03 .310 .308 16.5 18.9 20.2 34.0 54.3 61.4 21 7.01 .329 .315 16.8 28.5 32.1 44.7 76.5 79.0 - One of the primary uses for new solid solutions according to the present invention which exhibit relatively low Y CIE tri-stimulus values and relatively high near infrared reflectance would be as inorganic pigments in military camouflage paint or netting applications. By using these pigments in place of known pigments which contain cobalt, the radiation signature of a camouflage painted or covered object can be tailored to match the background in the visible and near infrared portions of the electromagnetic spectrum. Moreover, because many of these new solid solutions exhibit relatively high near infrared reflectance in a range of colors, they would also be suitable for use in the general paint and polymer markets, most specifically for architectural applications, such as vinyl siding, where increased near infrared reflectance would result in lower heat build-up and thus lower energy costs. Due to their high IR reflectivity, pigments according to the present invention are particularly useful in building material applications where heat reduction is desirable such as, for example, stucco, paint, vinyl siding, roofing tiles, roofing granules, roofing shingles, and brick.
- Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and illustrative examples shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.
Claims (23)
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Also Published As
Publication number | Publication date |
---|---|
US6454848B2 (en) | 2002-09-24 |
EP1141105A1 (en) | 2001-10-10 |
WO2000024817A1 (en) | 2000-05-04 |
US6174360B1 (en) | 2001-01-16 |
CA2347886A1 (en) | 2000-05-04 |
EP1141105A4 (en) | 2006-01-04 |
CA2347886C (en) | 2011-03-29 |
MX222931B (en) | 2004-09-24 |
MXPA01004150A (en) | 2002-06-04 |
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