| 摘要 |
<p>Preparing polyether polyols having n number of blocks (E n) respectively comprising at least 75 wt.% oxyethylene units, and m number of blocks (A m) which are different from the (E n) blocks, and at least one starter compound having at least one Zerevitinov-active hydrogen atom and a melting point of >= 40[deg] C, comprises: reacting at least one starter compound with ethylene oxide and at least one additional alkylene oxide compound in the presence of a catalyst. The blocks (E n) are metered under specific condition. Preparing polyether polyols having n number of blocks (E n) respectively comprising at least 75 wt.% oxyethylene units, and m number of blocks (A m) which are different from the (E n) blocks, and at least one starter compound having at least one Zerevitinov-active hydrogen atom and a melting point of >= 40[deg] C, comprises: reacting at least one starter compound with ethylene oxide and at least one additional alkylene oxide compound in the presence of a catalyst. The blocks (E n) are metered under the condition which is represented by an equation comprising ((T nx x(cat)x t n)/ (x n(EO))) (I) which is greater than 2.9 in [deg] Cx hours, where n and m are equal to 1-10, T n is mean reaction temperature in [deg] C during the metered addition of the ethylene oxide for the (E n) blocks, x(cat) is the amount of catalyst used in mole, t n is metering time for the ethylene oxide in the (E n) blocks in hours, x n(EO) is defined amount of ethylene oxide metered in for (E n) blocks in mole, The total content of oxyethylene units in the polyether polyols, based on the total mass of all the alkylene oxides metered, is 5-85 wt.%.</p> |
