Abstract: UV accelerated aging test was applied to analyze the influence of ageing conditions on the morphology, adhesion classification, fire resistance and char formation of amino transparent intumescent fire-retardant coatings. The results showed that the coatings appear obvious cracks and bubbles after ageing treatment, accompanying with the degradation of structural integrity and fire resistance. The incorporation of polyethylene glycol borate（PEG -BA）is beneficial to decrease the cracking, blistering and powdering of the coatings, thus imparting superior durability of fire resistance to the resulting coatings. The aging resistance performance of the coatings depends on the content of PEG -BA. When 20% PEG -BA is added, the resulting coating shows the adhesion classification of 2B rating and the equilibrium backside temperature of 184.1 ℃ after 11 aging cycles, corresponding to the best anti-aging performance.

Key words: transparent intumescent fire -retardant coatings, polyethylene glycol borate, fire-resistance time, anti-aging property, adhesion classification