Paints to Reflect Ultraviolet Light

Donald F. Wilcock, Walter Soller

The development of paints reflecting up to 70 per cent in the ultraviolet is described. The stages of development are (a) testing of reflection or transmission of possible paint materials, (b) testing of the simplest possible combinations of pigment and vehicle to determine those suitable, (c) determination of those resin-plasticizer combinations which form good films and have low ultraviolet absorption, and (d) accurate milling of the most likely formulations and testing of these for reflection and stability on exposure to ultraviolet light. For this purpose an apparatus was developed which measures accurately the integrated reflection factors and the transmission coefficients of substances in the band from 2800 to 3200 Å. This apparatus balances out fluctuations in source intensity, and its readings are independent of the amplification of its amplifier. An exact method of correcting for the multiple reflections between the surfaces of the windows in an absorption cell is described. © 1940, American Chemical Society. All rights reserved.

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Materials
Curve 1
Temperature Range, K: 298 Geometry θ'ω': 0 2π Composition (weight percent), Specifications and Remarks: Powder; packed in a shallow steel cell; data extracted for the band from 0.28 to 0.32 µm.
Curve 1
Temperature K: 298 Wavelength Range, µm: 0.28-0.32 Geometry θ': 0° 2π Composition (weight percent), Specifications, and Remarks: Powder packed in a shallow steel cell; data is the average over the band 0.28 to 0.32 µm.
Curve 1
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Magnesium carbonate in 60 ethylcellulose plus 40 Dow 7 binder; pigment volume 40%; milled; measured over the wavelength band 0.28 to 0.32 µm. [Authors' designation: No. G-10]
Curve 2
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to ultraviolet radiation (one ft from a GE S-1 sunlamp) for 7 days.
Curve 3
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to ultraviolet radiation (one ft from a GE S-1 sunlamp) for 15 days.
Curve 4
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to ultraviolet radiation (one ft from a GE S-1 sunlamp) for one mo.
Curve 5
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to ultraviolet radiation (one ft from a GE S-1 sunlamp) for two mo.
Curve 6
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to ultraviolet radiation (one ft from a GE S-1 sunlamp) for four mo.
Curve 7
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to ultraviolet radiation (one ft from a GE S-1 sunlamp) for eight mo.
Curve 8
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Similar to curve 1 specimen and conditions.
Curve 9
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except aged in air for 85 days.
Curve 1
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Magnesium Oxide in 60 ethylcellulose plus 40 Dow 7 binder; pigment volume 40%; milled; measured over the wavelength band 0.28 to 0.32 µm. [Authors' designation: No. G-9]
Curve 2
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to the ultraviolet radiation (1 ft from a GE S-1 sunlamp) for seven days.
Curve 3
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to the ultraviolet radiation (1 ft from a GE S-1 sunlamp) for 15 days.
Curve 4
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to the ultraviolet radiation (1 ft from a GE S-1 sunlamp) for one mo.
Curve 5
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to the ultraviolet radiation (1 ft from a GE S-1 sunlamp) for two mos.
Curve 6
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to the ultraviolet radiation (1 ft from a GE S-1 sunlamp) for four mos.
Curve 7
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except exposed to the ultraviolet radiation (1 ft from a GE S-1 sunlamp) for eight mos.
Curve 8
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Similar to curve 1 specimen and conditions.
Curve 9
Temperature Range, K: 298 Geometry θ θ' ω': 0° Reported Error, %: 2π Composition (weight percent), Specifications and Remarks: Above specimen and conditions except aged in air for 85 days.