聚乙烯/水滑石保温复合薄膜的制备及性能研究

Preparation and Properties of Polyethylene/Hydrotalcite Thermal Insulation Composite Films

采用国内外3种不同的水滑石(LDH)(国产A、B和进口C)分别与聚乙烯(PE)进行熔融共混,通过挤出吹塑工艺制备了PE/LDH复合薄膜。利用扫描电子显微镜、傅里叶变换红外光谱、拉伸强度、差示扫描量热等测试对比分析了3种LDH对复合薄膜结构和性能的影响。结果表明,LDH含量为8%(质量分数,下同)时,复合薄膜在1 428.6~714.3 cm^(-1)的吸光度积分面积较PE膜分别提升了183%(A)、177%(B)和77.1%(C),国产LDH对远红外线阻隔率明显优于进口LDH;加入国产LDH的复合薄膜的力学性能更为优异,趋于各向同性;复合薄膜的透光率均高于89%,雾度以进口LDH最小;3种LDH对复合薄膜的疏水性、热性能等方面改善相差不大;综合性能表明,国外进口LDH与国产LDH相比优点并不突出,国产LDH的性价比更高。

Polyethylene(PE)/hydrotalcites(LDH)composite films were prepared through extrusion blow molding using three types of LDH,including the domestic products A and B,and imported product C.The effects of three types of LDH on the structure,heat preservation,mechanical properties,light transmittance,hydrophobicity,moisture retention and thermal properties of the composite films were investigated comparatively.When 8%LDH were incorporated,the infrared absorbance integral area of the composite films increases by 183%for the product A,177%for the product B and 77.1%for the product C compared to pristine PE film.Mechanical analysis indicated that the composite films containing the domestic LDH achieved much better tensile strength and elongation at break and tended to be isotropic.All of the composite films presented the light transmittance higher than 89%,and the haze of the composite films containing the imported LDH was smallest.Furthermore,there are no significant difference between the hydrophobicity and thermal properties of three types of composite films.Performance investigation indicated that the advantages of the imported LDH did not have outstanding comprehensive performance compared to the domestic ones.However,the domestic LDH are more cost⁃effective.