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A copolyester-limestone composite fabricated with selective laser sintering technology is a potential material for the repair of ancient brick structures damaged by the sun and rain, however the weather resistance of this material must be improved. Herein, UV-236 and UV-328 were employed as UV stabilizers and added into the composite. The results show that the addition of UV-326 and UV-328 effectively inhibited the degradation of CH and ester groups and the formation of hydroxyl, carbonyl, and carboxyl groups. Thus, the stabilizers significantly reduced the color change and decline in mechanical properties of the composite under sun and rain conditions. The proposed strategy can be used for the repair of damaged precious brick buildings.

Improvement of the Weather Resistance of a Selective Laser-Sintered Copolyester–Limestone Composite Using UV-326 and UV-328