Method of preparing a light-absorbing coating
View Patent ↗A method of preparing a light-absorbing layer applied to a lamp vessel of an electric lamp. At least a part of the lamp vessel is provided with a light-absorbing coating which has stabilized pigments incorporated in a sol-gel matrix. In order to stabilize the pigments, an aminosilane is added.
1. A method of preparing a light-absorbing layer for use in a lamp, said method at least comprising:
preparing a pigment dispersion by mixing said pigment with an alcohol-comprising liquid and adding a stabilizer which includes an aminosilane, wherein the pigment is an inorganic pigment;
preparing a hydrolysis mixture comprising a silane which is subjected to a sol-gel process;
mixing the pigment dispersion and the hydrolysis mixture to form said light-absorbing layer; and
applying the mixed pigment dispersion and hydrolysis mixture to at least a portion of a lamp vessel to form the light-absorbing layer;
wherein said aminosilane is selected from the group consisting of dimethylaminopropylsilane, (N,N,-dimethylaminopropyl)trialkoxysilane, and a salt of a trimethylaminopropylsilane.
2. A method as claimed in claim 1 , wherein the alcohol-comprising liquid comprises a water/ethanol mixture.
3. A method of preparing a light-absorbing layer for use in a lamp, said method at least comprising:
preparing a pigment dispersion by mixing said pigment with an alcohol-comprising liquid and adding a stabilizer which includes an aminosilane;
preparing a hydrolysis mixture comprising a silane which is subjected to a sol-gel process;
mixing the pigment dispersion and the hydrolysis mixture; and
applying the mixed pigment dispersion and hydrolysis mixture to at least a portion of a lamp vessel to form the light-absorbing layer;
wherein said aminosilane is selected from the group consisting of dimethylaminopropylsilane, (N,N-dimethylaminopropyl)trimethoxysilane, and (N,N-dimethylaminopropyl)triethoxysilane.
4. The method of claim 1 , further comprising applying the light-absorbing layer over said lamp, wherein a thickness tc of the light-absorbing coating is tc≧1.5 μm.
5. The method of claim 1 , further comprising applying the light-absorbing layer over said lamp, wherein a thickness tc of the light-absorbing coating is tc≧4 μm.
6. A method of preparing a light-absorbing layer for use in a lamp, said method at least comprising:
preparing a pigment dispersion by mixing said pigment with an alcohol-comprising liquid and adding a stabilizer which includes an aminosilane;
preparing a hydrolysis mixture comprising a silane which is subjected to a sol-gel process;
mixing the pigment dispersion and the hydrolysis mixture to form said light-absorbing layer; and
applying the mixed pigment dispersion and hydrolysis mixture to at least a portion of a lamp vessel to form the light-absorbing layer;
wherein the pigment is selected from the group consisting of iron oxide, iron oxide doped with phosphor, zinc-iron oxide, cobalt aluminate, neodymium oxide, bismuth vanadate, zirconium praseodymium silicate and mixtures thereof; wherein said aminosilane is selected from the group consisting of dimethylaminopropylsilane, (N,N,-dimethylaminopropyl)trialkoxysilane, and a salt of a trimethylaminopropylsilane.
7. A method of manufacturing an electric lamp vessel comprising:
preparing a pigment dispersion by mixing a pigment with a liquid and adding a stabilizer, the stabilizer including an aminosilane, wherein the pigment is an inorganic pigment;
preparing a hydrolysis mixture comprising a sol-gel precursor;
mixing the pigment dispersion and the hydrolysis mixture; and
applying the mixed pigment dispersion and hydrolysis mixture to at least a portion of the lamp vessel to form a light-absorbing layer;
wherein said aminosilane is selected from the group consisting of dimethylaminopropylsilane, (N,N,-dimethylaminopropyl)trialkoxysilane, and a salt of a trimethylaminopropylsilane.
8. A method of manufacturing an electric lamp comprising:
preparing a pigment dispersion by mixing a pigment with a liquid and adding a stabilizer, the stabilizer including an aminosilane, wherein the pigment is an inorganic pigment;
preparing a hydrolysis mixture comprising a sol-gel precursor;
mixing the pigment dispersion and the hydrolysis mixture;
applying the mixed pigment dispersion and hydrolysis mixture to at least a portion of a lamp vessel to form a light-absorbing layer; and
assembling the electric lamp including the lamp vessel;
wherein said aminosilane is selected from the group consisting of dimethylaminopropylsilane, (N,N,-dimethylaminopropyl)trialkoxysilane, and a salt of a trimethylaminopropylsilane.
9. The method of claim 1 , wherein said (N,N,-dimethylaminopropyl)trialkoxysilane includes (N,N-dimethylaminopropyl)trimethoxysilane, or (N,N-dimethylaminopropyl)triethoxysilane.
10. The method of claim 6 , wherein said (N,N,-dimethylaminopropyl)trialkoxysilane includes (N,N-dimethylaminopropyl)trimethoxysilane, or (N,N-dimethylaminopropyl)triethoxysilane.
11. The method of claim 7 , wherein said (N,N,-dimethylaminopropyl)trialkoxysilane includes (N,N-dimethylaminopropyl)trimethoxysilane, or (N,N-dimethylaminopropyl)triethoxysilane.
12. The method of claim 8 , wherein said (N,N,-dimethylaminopropyl)trialkoxysilane includes (N,N-dimethylaminopropyl)trimethoxysilane, or (N,N-dimethylaminopropyl)triethoxysilane.