EVOH树脂薄膜制备及其保温性能的红外光谱研究

摘要

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 μtm wavelength range, it is just 9. 03％ in 7～14 μtm 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.%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7～14μm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.