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Energy efficient construction surfaces

A technology of outer surface and reflective layer, applied in the direction of building, sustainable building, building structure, etc., can solve problems such as loss of reflectivity

Inactive Publication Date: 2010-10-27
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While lighter colors may meet initial solar reflectance standards (such as those required for "Energy Star" labeling), lighter colors tend to age over time as dirt and microbes accumulate. loses its reflectivity with the passage of

Method used

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  • Energy efficient construction surfaces
  • Energy efficient construction surfaces
  • Energy efficient construction surfaces

Examples

Experimental program
Comparison scheme
Effect test

test approach 1

[0045] Reflectance measurements were performed using a Perkin Elmer Lambda 900 spectrophotometer equipped with a PELA-1000 integrating sphere accessory. The ball has a diameter of 150 mm (6 inches) and complies with ASTM methods E903, D1003, and E308 contained in "ASTM Standards on Color and Appearance Measurement" (Third Edition), published by ASTM in 1991. Optical diffuse reflectance (DLR) is measured in the 250-2500nm spectral range. UV-Vis integration was set at 0.44 seconds. The slit width is 4 nm. Use a "trap" to eliminate problems caused by specular reflectivity.

[0046] All measurements were performed with a clean, optically flat fused silica (quartz) plate placed in front of the sample or a standard white plate. A cup with a diameter of about 50 mm and a depth of about 10 mm is filled with the particles to be characterized.

test approach 2

[0048] The L * a * b * For colour, the use of traversing rollers is to ensure an even level of preparation for measurement. The container is filled to a depth of about 5 mm to ensure that the measured value is due to the particles. For a more detailed description of sample containers and sample preparation, see US Patent No. 4,582,425.

test approach 3

[0050] The particles to be tested are sieved to obtain a size class which passes through a 16 mesh and remains on a 20 mesh US Standard sieve drum. Measure 15 g of sieved granules in a 31 mm diameter open cup (Spex CertiPrep, Metuchen, NJ, USA) with polyethylene split ring and adjustment ring initial copper content. The bottom of the assembled sample cup was lined with a 0.2 mil (5 micron) thick, 2 7 / 8 inch (7.3 cm) wide polypropylene window film (Spex CertiPrep, Metuchen, NJ, USA) . Taking care not to tap or otherwise cause the particles to rearrange in the cup, place the cup on the probe of an XMET880 X-ray fluorescence (XRF) instrument equipped with a surface analysis probe (produced by Metorex, Ewing, NJ, USA). , the surface analysis probe is immobilized with a 60 mCi Cm-244 excitation source. The sampling time was set to 20 seconds. The instrument has been calibrated with a series of particles of known copper content and data are reported in grams per metric ton.

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Abstract

The present invention provides a non-white construction surface comprising a substrate, a first reflective coating on at least a portion of an outer surface of a substrate, such that the substrate with this first reflective coating exhibits a minimum direct solar reflectance value of at least about 25%, and a second reflective coating on at least a portion of the first reflective coating, whereinthe combination of the first reflective coating and the second reflective coating provide the substrate with a reflectivity of at least about 20% at substantially all points in the wavelength range between 770 and 2500 nm.

Description

technical field [0001] The present invention relates to reflective coatings for use on exterior surfaces such as asphalt shingle roofs, roof tiles and other exterior surfaces for increasing solar reflectance and for prolonging the effective use of such coatings period method. Background technique [0002] To conserve energy, it is increasingly desirable to reflect solar energy off roofs and other exterior surfaces. Absorbed solar energy increases the building's cooling energy bill. In addition, in densely populated areas such as large urban areas, the absorption of solar energy will increase the ambient temperature. The main absorber of solar energy is building roof. It is very common for ambient air temperatures in metropolitan areas to be 10°F or more higher than surrounding rural areas. This phenomenon is commonly referred to as the urban heat island effect. Reflecting solar energy instead of absorbing it reduces cooling bills and thus energy bills in buildings. Add...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B1/00E04D1/22G02B5/08
CPCG02B5/0816E04D1/22E04D2001/005Y02B80/34Y10T428/24372Y02A30/254Y02B80/00E04D1/28
Inventor 马克·T·安德森彼得·B·弗莱明拉克尔·A·T·古尔德克里斯托夫·L·格罗斯小丹尼尔·B·彭德格拉斯
Owner 3M INNOVATIVE PROPERTIES CO