摘要
以淀粉、聚乙烯醇为基本原料,甲醛为交联剂,甘油为增塑剂,用浇铸法经PVC疏水化处理后制备了聚乙烯醇—淀粉生物降解膜材料。研究了原料配比、疏水化处理对膜性能的影响。结果表明,淀粉含量增加,提高了材料的生物降解性能和伸长率,但拉伸强度下降;疏水化处理明显提高了湿强度,在水中浸泡16天仍具有较高的强度(未处理膜在水中浸泡数分钟便完全失去强度);与PE膜对比,机械性能较好,透光率、保温性相当,透氧率略低,由于具有较好的吸湿性,膜内形成微细雾滴,从而提高了防病虫害功能。在土中堆埋4个月后,膜降解成脆片。
With starch and polyvinyl alcohol as basic materials, formaldehyde as crosslinking agent, glycerol as plasticizer, polyvinylalcohol-starch biodegradable agriplast film materials were prepared by casting process, through PVC hydrophobic processing.The effects of compounding ratio and hydrophobic processing on the film property were studied. The results showed that thebiodegradability and elongation of the film increased with the increase of the starch, but the tensile strength decreased, thestrength obviously increased after the hydrophobic processing, having a high strength even after being immersed in water for 16days (while the film not being processed lost its strength when immersed in water for a few minutes). Compared with PE film,the mechanical properties of the film was better, the light transmission and thermal insulating properties were as good as those ofPE film, but the oxygen permeability was decreased. The insect preventing ability was improved because of the forming ofdroplet and good hygroscopicity of the film. The film would degrade into embrittled pieces after being laid into the earth for 4months.
出处
《塑料工业》
CAS
CSCD
北大核心
1990年第3期44-47,共4页
China Plastics Industry
