Application of linear siloxanes and method for their manufacture
A kind of use, alkyl technology, applied in the field of linear polyether siloxane in the field of preparing polyester polyurethane, to achieve the effect of good flame retardancy and improved water absorption
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Embodiment 1
[0110] OH-terminated polyethers containing pure ethylene oxide units (EO) are reacted in the hydrosilylation reaction.
[0111] In a 2 L single-necked flask equipped with a stirrer, mix 775 g of α,ω-hydride-terminated polydimethylsiloxane with an average chain length of 9 Si, 724 g of hexamethyldisiloxane and 1.5 g of trifluoromethanesulfonic acid and stirred at room temperature for 3 days. Subsequently, 30 g of sodium bicarbonate was added to the equilibrium mixture, stirred at room temperature for 2 h and filtered. A siloxane balance is obtained.
[0112] In a 1-L three-necked flask equipped with a stirrer, high-efficiency condenser, heating mantle, thermometer and dropping funnel, 142 g of pure EO-containing polyether initiated by allyl alcohol (average molar mass 200 g / mol) were initially introduced , heated to 60° C. and mixed with Karstedt catalyst (platinum-divinyltetramethyldisiloxane complex from ABCR) such that platinum was present in the mixture at a concentration...
Embodiment 2
[0116] OH-terminated polyethers containing ethylene oxide units (EO) and propylene oxide units (PO) are reacted in the hydrosilylation reaction.
[0117] In a 2 L four-necked flask equipped with a stirrer, mix 1039 g of α,ω-hydride-terminated polydimethylsiloxane with an average chain length of 9 Si, 964 g of hexamethyldisiloxane and 2 g of trifluoromethanesulfonic acid, and stirred at room temperature for 24h. Subsequently, 40 g of sodium bicarbonate was added to the equilibrium mixture, stirred at room temperature for 4 h and filtered. A siloxane balance is obtained.
[0118]In a 1L three-necked flask equipped with a stirrer, a high-efficiency condenser, a heating mantle, a thermometer and a dropping funnel, initially introduce 216 g of polyether containing EO / PO initiated by allyl alcohol (average molar mass 600 g / mol , about 80% EO, 20% PO), heated to 90°C and mixed with Karstedt catalyst (platinum-divinyltetramethyldisiloxane complex from ABCR) so that based on the tota...
Embodiment 3
[0120] OH-terminated polyethers containing ethylene oxide units (EO) and propylene oxide units (PO) are reacted in the hydrosilylation reaction.
[0121] In a 2 L single-necked flask equipped with a stirrer, mix 775 g of α,ω-hydride-terminated polydimethylsiloxane with an average chain length of 9 Si, 724 g of hexamethyldisiloxane and 1.5 g of trifluoromethanesulfonic acid and stirred overnight at room temperature. Subsequently, 30 g of sodium bicarbonate was added to the equilibrium mixture, stirred at room temperature for 2 h and filtered. A siloxane balance is obtained.
[0122] In a 1L three-necked flask equipped with a stirrer, a high-efficiency condenser, a heating mantle, a thermometer and a dropping funnel, initially introduce 235 g of polyether containing EO / PO initiated by allyl alcohol (average molar mass 900 g / mol , about 70% EO, 30% PO), heated to 90°C and mixed with Karstedt catalyst (platinum-divinyltetramethyldisiloxane complex from ABCR) so that based on the...
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