采用熔融共混法制备苯二甲酸-己二酸丁二醇酯(PBAT)、聚乳酸(PLA)、碳酸钙和不同种类抗氧剂的共混物,并探究了抗氧剂种类对于共混物力学性能与散发性能的影响。结果表明:单独引入0.1%的辅抗如RIANOX 168、ADK STAB PEP-36时,熔体流动指数有小幅度的下降,在辅抗的基础上进一步引入0.1%主抗氧剂,共混物的熔体流动指数进一步下降。结合撕裂强度、落镖冲击和拉伸测试的数据,0.1% 1790和0.1% RIANOX 168添加时,薄膜的综合力学性能最优。共混物中引入主抗氧剂时,气味没有降低,反而有不同程度的上升。引入抗氧剂后,甲苯、二甲苯和苯乙烯都无明显的变化,在引入了0.1% 1790和0.1% RIANOX 168时,样品的甲醛、乙醛和丙烯醛浓度分别下降了60%、41%和38%。对推广生物降解材料的应用有理论支撑,对塑料软包装领域的绿色转型有重要的研究价值。
The melt blending method was used to prepare blends of poly(butylene terephthalate adipate)(PBAT),polylactic acid (PLA),calcium carbonate and different kinds of antioxidants,and the effects of antioxidant types on the mechanical and emissive properties of the blends were investigated.The results showed that there was a small decrease in the melting index when 0.1% of auxiliary antioxidants such as RIANOX 168 and ADK STAB PEP-36 were introduced alone,and the melting index of the blends further decreased when 0.1% of the main antioxidants were further introduced on top of the auxiliary antioxidants.Combined with the data of tear strength,falling dart impact and tensile tests,the overall mechanical properties of the films were optimized when 0.1% of 1790 and 0.1% of 168 were added.When the main antioxidant was introduced into the blends,the odor did not decrease,but rather increased to varying degrees.There were no significant changes in toluene,xylene and phenylethylene after the introduction of the antioxidant,and the concentrations of formaldehyde,acetaldehyde and propionaldehyde in the samples decreased by 60%,41% and 38%,respectively,when 0.1% of 1790 and 0.1% of 168 were introduced.This study has theoretical support for the promotion of the application of biodegradable materials and has important research value for the green transformation of the plastic flexible packaging field.
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基金资助
国家自然科学基金(52371059)
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