Study on Synthesis of Ultra-High Molecular Weight Polyether Polyols for MS Adhesive
Polyether polyols with molecular weights of 12 000 g/mol and 18 000 g/mol were synthesized with propylene glycol as starting agent and bimetallic cyanide complex(DMC)as catalyst.The structure of the product was characterized by Fourier transform infrared spectroscopy(FTIR),hydrogen nuclear magnetic resonance spectroscopy(1H-NMR)and gel permeation chromatography(GPC).Ultra high molecular weight polyether polyols have the characteristics of narrow molecular weight distribution and low unsaturation.The effects of initiator moisture content,feed rate,polymerization temperature and stirring speed on polymerization activity and product indexes were discussed.When the water content of propylene glycol initiator is≤0.06%,the PO feed rate is 220～250 g/h,the polymerization temperature is controlled between 130～135℃,and the catalyst concentration is 30 mg/kg,the product quality can be ensured.Silane modified polyether resin(MS resin)was synthesized from the prepared ultra high molecular weight polyether polyol and MS glue was prepared.The results show that MS resin has moderate viscosity and excellent properties.
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