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摘要
以聚对苯二甲酸-己二酸丁二醇酯(PBAT)、碳酸钙(CaCO3)、聚乳酸(PLA)为原料,通过添加不同种类助剂,采用熔融共混法制备了PBAT/PLA/CaCO3共混薄膜,研究了助剂种类对共混薄膜力学性能和延时边封性能的影响。结果表明:引入抗水解剂HYMAX 210后共混薄膜的拉伸强度达到最大,纵向、横向拉伸强度分别为25.3MPa和23.1MPa,与对比样相比分别提升了10%和18.5%;引入扩链剂ADR-4468以及抗水解剂HYMAX 210的共混薄膜其初始边封强度最高,随着薄膜放置时间的延长,延时边封强度快速下降;而引入单硬脂酸甘油酯ST-101的共混薄膜样品随着薄膜放置时间的延长,延时边封强度下降幅度较小,第9d的延时边封强度保持率为61.5%。引入单硬脂酸甘油酯ST-101的薄膜表面CaCO3的暴露程度明显低于对比样,CaCO3不团聚。原因是引入单硬脂酸甘油酯的共混体系流动性提升,对于CaCO3的浸润与包裹效果提升。引入抗水解剂HYMAX 210的共混薄膜,放置9d后,薄膜表面CaCO3的暴露最为严重,并且伴随着大颗粒CaCO3团聚的现象。
Abstract
Using poly(butylene adipate-co-terephthalate)(PBAT),calcium carbonate (CaCO3),and polylactic acid (PLA) as raw materials,PBAT/PLA/CaCO3 blended films were prepared via melt-blending method with the addition of different types of additives.The effects of additive types on the mechanical properties and delayed edge sealing performance of the blended films were investigated.The results revealed that the tensile strength of the films reached its maximum when the hydrolysis stabilizer HYMAX 210 was introduced,with longitudinal and transverse tensile strengths of 25.3MPa and 23.1MPa,respectively,representing increase of 10% and 18.5% compared to the blank sample.The film containing the chain extender ADR-4468 and HYMAX 210 exhibited the highest initial edge sealing strength,but the delayed edge sealing strength decreased rapidly with prolonged storage time.In contrast,the film modified with glycerol monostearate (ST-101) showed a smaller reduction in delayed edge sealing strength over time,retaining 61.5% of its delayed edge sealing strength after 9 days of storage.The ST-101-modified film also demonstrated significantly less surface exposure of CaCO3 particles compared to the blank sample,with no agglomeration of CaCO3.This improvement was attributed to the enhanced fluidity of the blended system with the introduction of ST-101,which improved the wetting and encapsulation of CaCO3.However,the film containing HYMAX 210 displayed severe surface exposure of CaCO3 after 9 days of storage,accompanied by agglomeration of large CaCO3 particles.
关键词
聚对苯二甲酸己二酸丁二醇酯
/
碳酸钙
/
助剂
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延时边封
Key words
poly(butylene adipate-co-terephthalate)
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calcium carbonate
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additives
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delayed edge seal
助剂种类对PBAT/PLA/CaCO3共混薄膜力学和延时边封性能的影响研究[J].
化工新型材料, 2025, 53(11): 215-219 DOI:10.19817/j.cnki.issn1006-3536.2025.11.011
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基金资助
国家自然科学基金面上项目(52371059);广州市教育局高校科研项目(2024312143)
