AN OZONE-RESISTANT POLYURETHANE COMPOSITION AND ASSOCIATED METHOD OF PRODUCTION
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United States of America Patent
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Issued Date -
Nov 14, 2013
app pub date -
Nov 10, 2011
filing date -
Nov 22, 2010
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Abandoned
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Abstract
The ozone-resistant polyurethane composition according to the present invention, which is for the linings of valves, pipes or ozone contactors used in advanced water-treatment plants, comprises: 100 parts by weight of a polyurethane prepolymer consisting of toluene diisocyanate and poly(tetramethylene ether)glycol; from 8 to 14 parts by weight of 6-methyl-2,4-bis(methylthio)phenylene-1,3-diamine; and from 0.8 to 2.8 parts by weight of benzophenone or benzotriazole. Also, the production method for the ozone-resistant polyurethane composition according to the present invention, which is for the linings of valves, pipes or ozone contactors used in advanced water treatment plants, comprises the steps of: mixing from 0.8 to 2.8 parts by weight of benzophenone or benzotriazole in 100 parts by weight of a polyurethane prepolymer consisting of toluene diisocyanate and poly(tetramethylene ether)glycol, and stirring for between 25 and 35 minutes at between 90 and 100° C.; and mixing from 8 to 14 parts by weight of 6-methyl-2,4-bis(methylthio)phenylene-1,3-diamine into the stirred liquid.
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