采用平挤上吹成膜工艺制备了EVOH, PE, EVA薄膜, 并利用红外光谱仪、 透光率/雾度测定仪等分别研究了以EVOH, PE, EVA树脂为基材生产的薄膜的透光率、 雾度、 红外阻隔率和温室增温、 保温性能的关系。 结果表明在光学性能上, EVOH树脂薄膜比常用的PE和EVA农膜的雾度分别下降10%和5%左右; 从红外透射率来看, EVOH薄膜的透射率较PE农膜和EVA农膜低很多, 尤其在辐射能量集中的7～14 μm波长范围内, EVOH的透射率仅为9.03%, 比EVA农膜低27%左右, 远远小于PE农膜, 说明其红外阻隔性能远远好于PE和EVA。 因此, EVOH薄膜的直射光透过率和红外阻隔效果更好, 作为农膜使用更有利于温室的升温和保温。

EVOH, PE and EVA films were prepared by extrusive blowing techniques, the optic capability, transmittance, haze, infrared anti-transmittance and heat preservation of the films were studied by IR spectroscopy and optic block. The result indicated that the haze degree of the EVOH film decreased about 10% and 5% compared to PE film and EVA film respectively, EVOH film’s transmission of IR is much less than other films in the 2.5～25 μm wavelength range, it is just 9.03% in 7～14 μm wavelength range, and about 27% less than EVA film, while much less than PE film. It was found that EVOH film has much better capability of infrared anti-transmittance and point-blank light transmission than other two kinds of films. It was good for calefaction and heat preservation of greenhouse.