Preparation and performance of alkali lignin-PVA crosslinked blend slow-release acetaniprid film.
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摘要: 以聚乙烯醇(PVA)和碱木质素为原料,交联剂为乙二醛,采用流延法制备碱木质素交联PVA共混啶虫脒缓释薄膜。采用傅里叶红外光谱方法对薄膜的化学结构进行分析,并表征薄膜的透气性和力学性能。通过单因素试验探索碱木质素与PVA质量比、乙二醛用量、啶虫脒用量对啶虫脒薄膜啶虫脒释放率的影响。结果表明:碱木质素与PVA成功交联,啶虫脒薄膜透氧气量增大,透二氧化碳量降低;啶虫脒薄膜的拉伸强度和断裂伸长率均比交联薄膜低。采用流延成膜法制备啶虫脒薄膜的最佳条件为碱木质素与PVA质量比3∶7、乙二醛用量1.5 mL、啶虫脒用量0.5 g,所制啶虫脒薄膜的啶虫脒释放率为31.8%。药水比例、温度对啶虫脒薄膜的释药快慢有一定影响。Abstract: With alkali lignin and PVA as raw material, glyoxal as crosslinker,the alkali lignin-PVA crosslinked blend slow-release pesticide film was prepared by tape casting. The chemical structure of the film was analyzed by FT-IR. The gas permeability and mechanical properties were characterized. The results showed that alkali lignin had been crosslinked with PVA successfully. Compared with non-acetaniprid crosslinked film, oxygen transmission of the acetaniprid slow-release film increased, its carbon dioxide transmission reduced, and its tensile strength and elongation at break decreased. The optimum preparation conditions of acetaniprid slow-release film were the mass ratio of alkali lignin and PVA 3∶7, glyoxal dosage 1.5 mL, acetaniprid dosage 0.5 g, and the release amount of acetaniprid 31.8%. The water solving method indicated that there is certain effect of potion proportion and temperature on the cumulative release rate of acetaniprid-loaded film.
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Keywords:
- lignin /
- polyvinyl alcohol /
- glyoxal /
- acetaniprid /
- slow release
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