Supported molecular sieve, method for preparing the same, method for preparing isocyanate prepolymer, and purification method

Abstract

The present application relates to a kind of supported molecular sieve and its preparation method, the preparation method and purification method of isocyanate prepolymer, wherein the supported molecular sieve includes molecular sieve and the blocking agent chemically bonded on the molecular sieve by coupling agent, the blocking agent is selected from at least one of phenolic compound, alcohol compound, oxime compound, ketone compound, amine compound, sulfite, active methylene compound or hydrocyanic acid, and the supported molecular sieve is used to remove free monomer in isocyanate prepolymer.The supported molecular sieve of the present application can remove free monomer in isocyanate prepolymer more efficiently and completely by combining physical adsorption and chemical adsorption, and the supported molecular sieve can be recycled after being released;At the same time, the removal process does not need too harsh removal conditions such as high temperature and high vacuum, and only needs simple adsorption and filtration device, equipment and operation method are simple, energy consumption and cost are low.

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