2. Poslex - Unsaturated Polyester Resin Additive


POSLEX is not equivalent to hydroquinone. Hydroquinone provides the protection of polyester against the oxygen in the air. The oxygen in the air is an initiator for polyesters. Hydroquinone binds the oxygen by giving quinone. POSLEX is irrelevant with oxygen. POSLEX prevents the formation of new radical or the radicals which formed in waiting period by the oxygen in the air. Because of that reason and the less usage of POSLEX instead of hydroquinone.

POSLEX doesn’t affect the forming time of “curing” during the polyester usage. However, hydroquinone and its derivatives are oxygen absorbents and they combine with peroxide giving quinone and they increase the quantity of peroxide needed for polymerization. In another way, hydroquinone prolongs the time of “curing”, whereas POSLEX does not.

TESTING METHOD: POSLEX is dissolved in ethylene glycol or methanol for preparing 20% solution of it. 100g of unsaturated polyester resin is taken into a glass bottle with a lid. 0,5-5g of the prepared POSLEX solution is added into the resin and mixed well. Then, the mixture is put into oven at 125 °C. Gelling control is done at half an hour intervals. Every hour corresponds to a month.

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