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Photocatalytic coating

A photocatalytic and coating technology, which is applied in the application fields of roofing pellets and building materials, can solve the problems of reducing photoactivity and affecting the color of coated pellets, etc.

Inactive Publication Date: 2009-10-21
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can affect the color of the coated pellets and reduce their photoactivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1-3 and comparative example A

[0029] Working Examples 1-3 and Comparative Examples A and B

[0030] Samples of Working Example 1 were prepared as described below. Add 2.00g TiO to a 250ml container 2 (W2730X, 30% by weight, experimental product from Degussa AG, Dusseldorf, Germany), 31.80g deionized water, 1.44g potassium silicate (potassium silicate Kasil1, 28.91% by weight, containing 2.47% by weight ratio SiO 2 / K 2 O, obtained from PQ Corporation, Valley Forge, PA), and 18.20 g of a 0.5% by weight aqueous solution of orthoboric acid (99% pure, obtained from Sigma-Aldrich, St. Louis, MO), and stirred well. The resulting mixture was then slowly poured onto 1000 g of WA 7100 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 loos...

example 4-6

[0036] The samples of Working Examples 4-6 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 4-6 are listed in Table 2 (for comparison, the compositions of Comparative Examples A and B are also listed). Compared with Working Example 1, sodium tetraborate pentahydrate (borax pentahydrate) was used instead of orthoboric acid. Specifically, a 2% by weight aqueous solution of sodium tetraborate pentahydrate (Borax Pentahydrate ETIBOR 48, available from American Borate Company, Virginia Beach, Virginia) was used.

[0037] The durability of the coated pellets was measured and reported in Table 2 (for comparison, the durability of Comparative Examples A and B are also listed). The results show that the combination of sodium tetraborate pentahydrate (borax pentahydrate) and potassium silicate achieves good durability. Furthermore, the results showed that the use of sodium t...

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PUM

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Abstract

In one aspect, the present invention is directed to a coating composition. The coating composition comprises photocatalytic particles and an alkali metal silicate binder comprising a boric acid, borate, or combination thereof. In another aspect, the present invention is directed to a coated article. The coated article has a photocatalytic coating with improved durability on its external surface that is formed from the aforethe coating composition.

Description

technical field [0001] The present invention relates to coating compositions and coated articles having photocatalytic coatings formed from the coating compositions, especially for use in building materials, such as roofing pellets. Background technique [0002] Discoloration of building surfaces due to algae growth or other media has been a problem that has plagued the construction industry for many years. Discoloration is often caused by the presence of blue-green algae and other airborne pollutants such as soot and grease. [0003] One way to solve this problem is to coat the building surfaces with a composition comprising a photocatalyst and a binder, usually a silicate binder. Photocatalysts can photooxidize organic materials that cause discoloration when exposed to sunlight. [0004] Photocatalytic titanium dioxide (TiO 2 ) particles can be used to provide photocatalytic activity, for example in roofing pellets. In order to obtain long-term photocatalytic performan...

Claims

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Application Information

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IPC IPC(8): B01J2/00E04F13/08C09D7/61
CPCC04B20/1077C09D5/1618C04B28/26B01J37/0215B01J35/004C09D7/1216C04B2111/00827C04B2111/2061C08K3/22E04D7/005E04D13/002C09D1/02C04B41/5089C04B2111/00586C09D7/61Y02W30/91B01J35/39C04B14/30C04B14/305C04B22/0013C04B2103/54C04B41/5006C04B41/5041C04B14/14C04B18/14
Inventor 白峰拉克尔·A·T·古尔德马克·T·安德森
Owner 3M INNOVATIVE PROPERTIES CO
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