Photocatalytic coating
A photocatalytic and coating technology, which is applied in the application field of roofing pellets and building materials, can solve the problems of affecting the color of coated pellets and reducing photoactivity
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Examples
example 1 and comparative example A-D
[0031] Samples of Working Example 1 were prepared as described below. 1.50g TiO 2 (STS-21, obtained from Ishihara Sangyo Kaisha, Japan), 50.59g deionized water, 0.75g sodium silicate (sodium silicate PD (Sodium Silicate PD), 37% by weight, containing 2.75% by weight of SiO 2 / Na 2 O, obtained from PQ Corporation, Valley Forge, PA), and a dispersion of 8.66 g of freshly prepared tetraethoxysilane (TEOS, 98%, obtained from Sigma-Aldrich, St. Louis, MO) in ethanol / water ( The molar ratio of the dispersion is TEOS:EtOH:H 2 O=1:40.7:53.6) was added into a 250mL container and stirred evenly. The resulting mixture was then slowly poured onto 1000 g of WA5100 pellets (untreated, available from 3M Company, St. Paul, MN) that had been preheated to 210°F (about 99°C) for one hour and being stirred. While pouring, stir the pellets to ensure an even coating. Continue to agitate the pellets for about 2 minutes. The pellets were then heated with a heat gun until they appeared dry and ...
example 2-5
[0039] The samples of Working Examples 2-5 were prepared by the same procedure as that of the sample of Working Example 1 was prepared. The compositions of the photocatalytic coatings of Working Examples 2-5 are listed in Table 2. In contrast to Working Example 1, Grade No. 11 uncoated pellets (available from 3M Company, St. Paul, MN) were used in Working Examples 2-5. In addition, the samples of Working Examples 3 and 5 were fired at 400°F (about 204°C) instead of 800°F.
[0040] The durability of the coated pellets was measured and reported in Table 2. The results also show that the use of tetraethoxysilane (TEOS) in combination with sodium silicate significantly increases durability.
[0041] Table 2
[0042] Composition of Photocatalytic Coatings of Working Examples 2-5 and Durability of Coated Pellets .
[0043] example
example 6-9
[0045] The samples of Working Examples 6-9 were prepared by the same procedure as that of the sample of Working Example 1 was prepared. The compositions of the photocatalytic coatings of Working Examples 6-9 are listed in Table 3. In contrast to Working Example 1, Grade No. 11 uncoated pellets were used in Working Examples 6-9. In addition, TEOS acidic aqueous solution was used in Working Examples 6-9. Prepare this solution by mixing 43.20 g of deionized water, 10.00 g of 98% TEOS, and a drop of 68 to 70% analytical nitric acid (HNO 3 ) (available from EM Industries, Gibbstown, NJ) was added to a 100 mL glass bottle and stirred magnetically for 60 minutes at room temperature. In addition, potassium silicate was used in Working Examples 7 and 8 instead of sodium silicate. In addition, the samples of Working Examples 8 and 9 were fired at 500°F (260°C) instead of 800°F.
[0046] The durability of the coated pellets was measured and reported in Table 3. The results show that...
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Abstract
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