MIT防霉聚乙烯保鲜膜研究

Study on anti-mildew polyethylene plastic added with MIT

以线性低密度聚乙烯／低密度聚乙烯（LLDPE／LDPE）（3：1）为基材，添加具有防霉功能的MIT（2-甲基-4-异噻唑啉-3-酮，2-methyl-4-isothiazolin-3-ketone）分子，制备了厚度为0．016～0．017mm，灰分含量为0．20％～024％，浓度为0．10％、0．15％、0．20％、0．25％和0．30％（w／w）的MIT防霉聚乙烯（PE）保鲜膜。结果表明：添加MIT的保鲜膜抑制灰霉菌效果均达到QB／T2591—2003标准的1级水平；添加MIT能够降低保鲜膜的断裂伸长率和透明度，0．30％MIT保鲜膜的断裂伸长率比空白膜降低了36．23％；随着MIT的增多，拉伸强度和热合强度不断增加，0．30％MIT保鲜膜的拉伸强度和热合强度分别比空白膜增加了18.41％和54．65％；在8℃条件下，用不同浓度的MIT防霉聚乙烯保鲜膜和空白对照保鲜膜对油莱包装贮藏12d，发现MIT保鲜膜包装的油莱黄化率和腐烂率明显比空白对照保鲜膜包装的油莱黄化率（13．2％）和腐烂率（1.36％）低，0．30％MIT保鲜膜的黄化率（7-3％）和腐烂率（0．56％）分别比空白对照显著降低44．70％和58皇2％（P〈0．05）。

The LLDPE/LDPE（3 ： 1 ） material as a substrate and MIT（2- methyl-4-isothiazolin-3- ketone） as an organic anti-mildew filler were combined to improve mildew proof PE films. The film with thickness of 0.016 0.0]Tmm ,ash content of 0.20% to 0.24%, MIT concentration of 0.10% ,0.15% ,0.20% ,0.25% and 0.30% （w/w）was prepared.Results indicated that all samples with MIT reached the level 1 based on the QB/T259!-2003.Compared with control films, samples with 0.30% MIT had an 36.2.3% decreasing in elongation break rate and lower transparency.With the increase of MIT amount,the tensile strength and heat sealing of samples were reinforced significantly.And the tensile strength and heat sealing of 0.30% MIT was higher than the blank films ]8.41% and 54.65%, respectively.After packaged with samples at 8℃ for 12 days,the etiolated rate and decay rate of the rapes decreased with the increasing of MIT amount.The etiolated rate and decay rate rape packaged with 0.30% MIT/PE （7.3% and 0.56% ）were markedly lower than the packaged with controls（ 13.2% and 1.36% ）44.70% and 58.82%, respectively.