材料期刊网

采用硅微粉和氢氧化镁分别作为导热及阻燃填料，与软质PVC基体熔融共混，制备出具有导热和阻燃功能的PVC复合材料，并对其热导率、垂直燃烧、拉伸强度以及热失重等进行测试和分析。结果表明：硅微粉和氢氧化镁两者之间在导热和阻燃性上存在相互协效促进的作用，制得的复合材料具有较高的热导率、良好的阻燃性能和综合性能。当添加125份硅微粉和25份氢氧化镁时，复合材料的热导率为0.77 W/(m·K)，燃烧等级达到FV-0级，烟密度等级低至65，体积电阻率为9.8×1010Ω·m，拉伸强度为11.8 MPa，断裂伸长率为170%。

A kind of PVC composite with thermal conductive and flame retardancy was prepared by melt blending method from silica powder, magnesium hydroxide, and soft PVC, and its thermal conductivity, vertical flammability, tensile strength, and thermal weight loss were tested and analyzed. The results show that the silica and magnesium hydroxide have synergistic promoting effect in thermal conductive and flame retardancy. The PVC composite has high thermal conductivity and good falme retardancy and com-prehensive properties. When the addtion amount of silica powder and magnesium hydroxide is 125 phr and 25 phr respectively, the thermal conductivity of the composite is 0.77 W/(m·K), the vertical flammabil-ity reaches FV-0, the smoke density is 65, the volume resistivity is 9.8 × 1010Ω·m, the tensile strength is 11.8 MPa, and the elongation at break is 170%.