Review on Water Stability of Polyurethane and Its Mixture
A systematic review was conducted on the research progress of water stability of polyurethane and its mix-tures.Firstly,the basic characteristics of polyurethane such as morphological structure,synthesis mechanism were introduced.The water resistance of polyurethane adhesive was studied to clarify that polyurethane is a block polymer composed of soft and hard segments.In order to achieve excellent water resistance,the selection of soft and hard segments is crucial.That polyether polyols was taken as soft segments and aromatic Isocyanate as hard segments can enhance the water resistance of polyurethane.Secondly,the influence of water on polyurethane mixtures was ana-lyzed.It was found that regardless of the type of polyurethane mixture,its relevant indicators such as freeze-thaw splitting strength and immersion Marshall stability decreased significantly after water stability testing.This is mainly because polyurethane undergoes hydrolysis under the influence of water,,which affects the performance of polyurethane and its mixtures.Finally,a review was conducted on the research on improving the water stability of polyurethane mixtures,three measures were summarized to improve the water stability of polyurethane mixtures,namely adjust the composition of the soft and hard segments of polyurethane adhesives,change the mix proportion of polyurethane mixtures,and add modifiers.This study can provide reference for the subsequent research on the water stability of polyurethane mixtures.
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