Stock material or miscellaneous articles – Composite – Of polyamidoester
Patent
1997-06-17
1999-10-05
Cameron, Erma
Stock material or miscellaneous articles
Composite
Of polyamidoester
4284258, 428458, 428511, 524 88, B05D 706, B05D 702, B05D 716
Patent
active
059621435
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a coating composition for producing heat radiation-reflecting coatings, containing a binder, pigments and solvents and/or water, which reduces the heating effect due to solar radiation on materials and interiors coated therewith.
There is an increasing tendency to clad exteriors of buildings with glass and other transparent materials, with the result that in particular the dark surfaces of interiors are strongly heated by direct solar radiation and produce high room temperatures. Heating caused by solar radiation may in particular also occur in interiors of means of transport such as buses, trams, airplanes, etc., due to the dark-coloured surfaces. When using plastics for facade elements or window profiles, especially in dark colours, the heat that is generated can lead to damage such as cracks, reduction in gloss and colour fading.
In order to reduce or avoid such heating effects, especially in the case where dark colours are used, coating systems containing pigments have been developed that do not or only slightly absorb infrared radiation. Their action is based on the fact that a paint film containing such pigments is applied to a lighter background that reflects the radiation in the infrared wavelength region and this radiation is not completely absorbed and converted into heat by the pigments in the coating, with the result that only a small amount of heat is generated.
JP-A 53 21 159 describes the use of black pigments, in particular perylene and azomethine azo black with an IR reflection of more than 600 in a wavelength range from 900 to 1500 nm.
JP-A 42 46 478 describes IR-reflecting surfaces in connection with a coating material that contains, inter alia, perylene-based pigments or azo pigments. A degree of reflection of 80% is achieved.
For use in coating materials that are to have specific, accurately predetermined colours and a predetermined appearance, these pigments must be combined with other coloured pigments. This leads to absorption phenomena of visible and infrared radiation components at the boundaries of the various pigments, resulting in an increased heating and undesirable colour effects.
According to JP-A 52 93 434 a special combination of coloured pigments each having a specific characteristic value for the reflection is used to protect against heating caused by solar radiation. Only pigments that are red, orange and yellow have favourable values of over 40% of this defined characteristic value, with the result that only slight reflection effects are produced when the pigments are combined to form dark colours. Furthermore, here too there is the possibility of undesired absorption phenomena, especially of infrared radiation fractions, occurring at the boundaries of the various pigments.
According to U.S. Pat. No. 4,272,291 oxides of titanium, nickel, antimony and chromium are used as heat-reflecting pigments, blending agents such as talcum and dolomite also being employed.
WO 89/43 51 describes thermally insulating coloured compositions containing pigment mixtures of one or more oxides of zirconium, yttrium and indium. In addition further oxides such as titanium dioxide, barium oxide and silicon oxide may be included, crystalline structures being used. If dark colours are desired, corresponding dark pigments must in addition be added to the composition.
The use of the metal compounds described in both publications is greatly restricted on account of the harmful effects on health of these compounds. Moreover, they are generally extremely expensive. If appropriate pigments are mixed in to produce dark colours, there is the danger of undesired absorption phenomena at the boundaries of the pigments and thus of undesired side effects.
DE-A 40 35 062 discloses a general method according to which interiors are provided with a surface that reflects IR radiation. Titanium dioxide, aluminium platelet pigments and chromium oxide are mentioned as IR-reflecting pigments and as suitable IR-reflecting pigments for producing camouflage colours. The disadvantage is
REFERENCES:
patent: 4272291 (1981-06-01), Shtern et al.
Sep. 2, 1992, Derwent Pulblications Ltd., London, GB; XP002026368 (Abstract).
Gruner Christian
Huthmacher Gerd
Krauthauser Helmuth
Cameron Erma
Herberts GmbH
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