| 摘要 |
<p>Presently, multifunctional carboxylic acids, such as 1,2,3,4-butanetetracarboxylic acid (BTCA) are used to bond a hydroxyl-functional organophosphorous oligomer to cotton fabric in the presence of a catalyst, such as sodium hypophosphite (NaH2PO2). However, the free carboxylic acid groups bound to the cotton fabric form a calcium salt during home laundering, thus diminishing the flame retardant properties of the treated cotton fabric. Disclosed herein is a new catalyst system consisting of hypophosphorous acid (H3PO2) and a nitrogen-containing organic base such as triethanol amine (TEA). When the catalyst system is present together with the polycarboxylic acid, TEA esterifies the free carboxylic acid groups under curing conditions, thus reducing calcium concentration on the fabric during home laundering. It also provides nitrogen-phosphorous synergism to enhance the flame retardant performance of the organophosphorous compound. The cotton fabric treated with BTCA and the hydroxyl-functional organophosphorous oligomer in the presence of this new catalyst system demonstrate flame retardant properties superior to that treated with NaH2PO2 as a catalyst.</p> |
