环氧改性有机硅聚合物的制备及其在发动机叶片防飞溅涂层中的应用

Synthesis of a Silicone Polymer Modified by Epoxy Resin and Its Application as Anti-Spatter Coating of Engine Blade for Laser Drilling

通过液体环氧树脂与羟基硅油在有机锡催化下反应,合成一种环氧(树脂)改性有机硅聚合物。利用FT-IR表征了该聚合物的化学结构,并且通过TG法测试了该聚合物的耐热性。羟基硅油占环氧改性聚合物质量分数的70%,即使加热到500℃以上,残余物质量分数也不低于30%。将该聚合物作为成膜物,进一步配制一种室温可固化的可剥性防飞溅耐高温保护涂料。测试了该涂料制备的涂层在吹气条件下激光加工发动机叶片的防飞溅性能,结果发现该涂层既能有效地发挥防飞溅作用,又不被气流掀起,起到了很好的保护作用,有效提高了发动机叶片激光打孔的质量。

A silicone polymer modified by epoxy resin was synthesized via the reaction of a liquid epoxy resin with a α,ω-dihydroxyl silicone under catalysis of dibutyltin dilaurate. Chemical structure of the modified silicone polymer was characterized by FT-IR, while heat-resistant of the polymer was tested by the thermogravimetry. The modified silicone polymer containing 70%(mass fraction) α, ω-dihydroxyl silicone shows excellent heat-resistant, which possesses residue of more than 30%(mass fraction) when heated at ≥ 500℃. A peelable heat-resistant coating cured at room temperature was used as anti-spatter coating under laser drilling, which was prepared with the modified silicone polymer as the film-former. The anti-spatter property of the coating on the engine blades was tested by exposing to laser drilling under air blowing conditions. The coating exhibits optimizing anti-spatter property which keeps adhered to the substrate after the laser drilling process. It has played a very good protective role and effectively improved the quality of laser drilling of engine blades.