Roofing granules with high solar reflectance, roofing products with high solar reflectance, and process for preparing same

a technology of solar reflectance and roofing products, applied in the field of roofing granules and roofing products, can solve the problems of reducing the effective service life of such roofs, affecting the appearance of the roof, and affecting the service life of the roof,

Inactive Publication Date: 2011-09-15
CERTAINTEED CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020]The present invention provides asphalt-based roofing membranes with solar reflectance greater than 70 percent. The present invention also provides roofing granules having a solar heat reflectance of a...

Problems solved by technology

However, depending on location and climate, shingled roofs can experience very challenging environmental conditions, which tend to reduce the effective service life of such roofs.
One significant environmental stress is the elevated temperature experienced by roofing shingles under sunny, summer conditions, especially roofing shingles coated with dark colored roofing granules.
Although such roofs can be coated with solar reflective paint or coating material, such as a composition containing a significant amount of titanium dioxide pigment, in order to reduce such thermal stresses, this utilitarian approach will often prove to be aesthetically undesirable, especially for residential roofs.
Furthermore, except in the white or very light colors, there is typically only a very small amount of pigment in the conventional granule's color coating that reflects solar radiation well.
Absorption of solar heat may result in elevated temperatures at the shingle's surroundings, which can contribute to the so-called heat-island effects and increase the cooling load to its surroundings.
To achieve such high level of solar reflectance, it has been proposed to coat the roof with a reflective coating over granulated roofing products...

Method used

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  • Roofing granules with high solar reflectance, roofing products with high solar reflectance, and process for preparing same
  • Roofing granules with high solar reflectance, roofing products with high solar reflectance, and process for preparing same
  • Roofing granules with high solar reflectance, roofing products with high solar reflectance, and process for preparing same

Examples

Experimental program
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Effect test

example 1

[0099]140 Kg of slate granules (PN15 slate granules, available from ARTI-Groupe CARLAC Parc d'Entreprises I'Esplanade 7, rue Paul-Henri Spaak F-77462 Saint Thibault des Vignes, France,) were employed as base particles. A representative base particle is shown in the micrograph of FIG. 5. The base particles were encapsulated with a white coating material using a fluidized bed coater (Model 1800 with W18-3 plate and CPI-#2 tip spray nozzle, available from The Coating Place Inc., Verona, Wis.). A representative roofing granule is shown in the micrograph of FIG. 6. The highly reflective coating consisted of 35.7 Kg of sodium silicate (Grade 40 from OxiChem Corp, Dallas, Tex.), 59.4 Kg water, 30 Kg of titanium dioxide pigment (R101 from DuPont Corp., Wilmington, Del.), and 15 Kg of kaolin clay (AF grade Snobrite from Unimin Corp). The coating is prepared by blending the ingredients in a tank using an air-driven mechanical agitator with air pressure of 80 psi till reaching uniform dispersi...

example 2

[0101]The particle size distribution of a sample of the slate particles used to form coated roofing granules of Example 1 was determined using a CPA Haver videogranulometer (No. Serie 061). The measured particle size distribution is provided in Table 2 below.

TABLE 2MinimumMaximumSievepercentpercentsize (mm)remainingremaining3.150022.500162.0006141.60012201.00012190.80010170.6307150.500360.315260.2500201

example 3

[0102]The coated roofing granules of Example 1 were inspected and representative flakes were selected by eye. Particle shape was determined using an Olympus SZ-PT stereo microscope with 4× objective and 10× eyepiece, coupled with VIA-170 image system with pre-calibrated dimension measurement to measure the length (L), width (W), and thickness (T). The results of the measurements are reported in Table 3 below.

TABLE 3aspectaspectParticlewidthlength L,thicknessratioratioNo.W, mmmmT, mmL / WL / T12.13863.39850.46421.5891247.32119822.3542.68470.49011.1404845.47786232.21293.81020.60891.7218136.25751442.22773.17960.62191.4273025.11271952.71783.56930.2451.31330514.5685761.89363.17960.37131.679138.56342672.07923.28030.36391.5776749.0142982.3023.14451.06191.3659862.96120291.80452.24670.2451.2450549.170204101.3964.80.49013.4383959.79392111.96042.60150.28221.3270259.218639121.58171.83940.30451.1629266.040722130.95791.80440.34161.8837045.282201140.68321.27880.2451.871785.219592152.07923.24530.28221....

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Abstract

A solar heat-reflective roofing product includes a base sheet, and solar heat-reflective roofing granules on top of the base sheet. The granules have a base particle with a flake-like geometry covered by a uniform coating layer. The coating layer has a thickness of at least one mil and includes a coating binder and at least one solar heat-reflective pigment. The solar heat-reflective pigment provides a solar heat reflectance of greater than 70 percent to the granules and the roofing product. Roofing products including roofing shingles and roofing membranes are described.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority of U.S. Provisional Patent Application No. 61 / 313,911 filed Mar. 15, 2010, and incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present application relates to roofing granules and roofing products including roofing products, such as roofing shingles and roofing membranes.[0004]2. Brief Description of the Prior Art[0005]Asphalt shingles or bitumen roofing membranes are conventionally used in the United States and Canada as roofing and siding materials. Roofing granules are typically distributed over the upper or outer face of such shingles. The roofing granules, in general are formed from mineral materials, and serve to provide the shingle with durability. They protect the asphalt from the effects of the solar radiation (in particular from the degradative effects of ultraviolet rays) and of the environment (wind, precipitation, pollution, and the like),...

Claims

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Application Information

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IPC IPC(8): D06N7/04B32B5/16B05D7/00B05D1/00
CPCC04B20/1033Y10T428/2991C04B20/107C04B20/1085C04B33/14C04B35/62695C04B35/62807C04B35/62884C04B2111/00586C04B2235/3232C04B2235/349C04B2235/5292C04B2235/5296C04B2235/5427C04B2235/5463C04B2235/9661D06N5/003E04D7/005E04D2001/005C04B20/1051Y10T428/2993Y10T428/2438C04B14/108C04B20/1059C04B14/20C04B14/34E04D1/22Y02B80/00Y02A30/254E04B1/78
Inventor SHIAO, MING LIANGKALKANOGLU, HUSNU
Owner CERTAINTEED CORP
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