Study on Preparation and Performance of Silane-terminated Polyether Resin for Sealant.

Using 3-isocyanatopropyl dimethoxysilane, polypropylene glycol (PPG), N-(βaminoethyl)-γ-aminopropyltrimethoxysilane as the main raw materials, silane-terminated polyether resins with different R values (molar ratio of isocyanate groups to hydroxyl groups) were prepared by polyaddition reaction. The structure of the product was characterized by infrared spectroscopy and hydrogen nuclear magnetic resonance spectroscopy, and the properties of the cured products were tested. The results show that with the increase of R value, the tensile strength of the cured silane-terminated polyether resin increases from 0.29 MPa to 0.63 MPa, the Shore A hardness increases from 12 to 33, and the elongation at break increases from 476.3 % to 127.2% ; the temperature drops when the mass loss rate is 10% and 30%, and the temperature rises when the mass loss rate is 50%, 80%, and at the end of thermal decomposition. The water absorption rate after immersing in deionized water for 7 days is changed from 15. 8% to 9.2% ; the silane-terminated polyether resin has good mechanical properties, thermal stability and water resistance, and can be used in the field of sealants. [ABSTRACT FROM AUTHOR]