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Abstract

Water-blown polyurethane rigid foams have serious disadvantages like, friability and resulting lower adhesion strength. To solve these problems, maleate is added to a polyol premix containing water or to polyisocyanate. Maleate does not react with either of them.

In spite of the high stability of the maleate-containing polyol premix or polyisocyanate, when the polyol premix and the polyisocyanate are mixed, maleate reacts immediately with the primary amine, generated by the reaction of isocyanate and water, to yield a secondary amine. Then the secondary amine reacts with another isocyanate to form ‘substituted-urea linkage,’ having moderate cohesive property related to the bulky maleate residue.

By the addition of maleate, the friability and the adhesiveness improves considerably. Furthermore, the dimensional stability of the modified rigid foam does not deteriorate by the addition of enough maleate to improve the friability. Computer simulation substantiates that the reactions that start from maleate and primary amine occurs during the foam preparation.

Thus, water-blown polyurethane rigid foam with improved friability and adhesiveness can be provided by mixing of inexpensive maleate alone.

Keywords

polyurethane rigid foam water-blowing adhesion strength friability maleate substituted urea linkage computer simulation

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Water-blown Polyurethane Rigid Foam Modified with Maleate

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