The desire for faster line speeds has fueled the development of internal mold release compounds for the pultrusion industry. In this study, several new phosphate ester-based mold releases were tested along with a commercially available product. Partial compositions in the products included zinc neutralized phosphate esters, amine neutralized phosphate esters, and additive zinc oleate. Pultrusion data showed that zinc neutralized phosphate esters dramatically reduce the pull force in clay filled systems by 75%. When line speed increased from 36 to 48 in/min, pull force decreased by 70% over the other types of release agents. Importantly, mechanical strength was not affected by using the new IMRs. Corrosion inhibition, exotherm temperatures, gel times, and cure times were better than the standard for most of the experimental systems. Calcium carbonate filled systems were also evaluated.
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