A single component room temperature curing sealant with excellent weather resistance is prepared by using silane modified polyether as the base polymer and adding a composite light stabilizer(UV-326+UV-770).Through natural exposure to sunlight and UV accelerated aging tests,it is found that composite light stabilizers are superior to single light stabilizers in improving the weather resistance of the sealants.When the amount of light stabilizer added is not saturated,the weather resistance of the sealant increases with the increasing of the amount added;after exceeding the saturation point,further increase in dosage will no longer significantly improve weather resistance and may lead to other performance declines and cost increases.
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