Properties of Polyurethane Containing New Phenolic Additives

For non-tar anticorrosive polyurethane coatings, polyurethane containing phenolic additives (i.e., phenol, styrene adducts with phenol ([St] n—Ph), and indene adducts with phenol ([In]n—Ph)) are prepared and the effusion properties are investigated. As an index on the effusion, the weight change of the polyurethane sheets soaked in water as a function of the soaking time and total organic carbon (TOC) in the water used for the soaking tests are measured. Only the weight of the polyurethane sheet containing [In]n—Ph did not decrease during the soaking test and the TOC was the least. Furthermore, the properties of the phenolic additives plasticizers or `antiplasticizer' are investigated. Although the density and the coefficient of thermal expansion of polyurethane containing [In]n—Ph are increased, since the tensile strength decreased and the elongation increased, [In]n—Ph will be regarded as a plasticizer rather than `antiplasticizer'.