Study on application performance of polyethylene/CaSO4 nanoparticle composite flexible packaging

doi:10.19491/j.issn.1001-9278.2022.06.003

Abstract

Abstract:

A new type of green， low?carbon and degradable eco?friendly composite film was prepared by melt co?extrusion based on the composition of 49 wt % polyethylene （PE） and 51 wt % CaSO₄ nanoparticles， and its application performance as flexible packaging was investigated by comparing with the PE/CaCO₃ composite film at the same loading. The application performance， hygienic performance， degradation performance， carbon content of the PE/CaSO₄ composite film were measured using tensile testing machine， high temperature gel chromatograph， xenon lamp sun aging test chamber， and total organic carbon analyzer. The results indicated that the composite film obtained better tensile strength and elongation at break of the PE/CaSO₄ composite film than the PE/CaCO₃ one at the same loading of filler. Its total migration， including water， 4 % acetic acid， 20 % ethanol， 95 % ethanol， isooctane， the consumption of potassium permanganate， and heavy metals did not exceed the limit requirements of national standards. Under accelerated aging conditions， the tensile properties and weight?average molecular weight of the composite film could meet the requirements of photodegradable plastics， and its carbon content was much lower than other plastic films. The promotion and applications of the PE/CaSO₄ composite flexible packaging can offer an important guiding significance for the promotion of national carbon reduction and emission reduction policies.

Key words: calcium sulfate, polyethylene, physical property, sanitary performance, degradation behavior, carbon content

CLC Number:

TQ325.1⁺2

WU Xiongjie, ZHU Dongbo, SUN Jiangbo, GAO Longmei, CHU Yu, CHENG Jinsong, XIE Aidi. Study on application performance of polyethylene/CaSO₄ nanoparticle composite flexible packaging[J]. China Plastics, 2022, 36(6): 10-15.

Figures/Tables 7

References 18

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检测项目	PE	PE/CaSO₄	PE/CaCO₃
拉伸强度（纵向）/MPa	63	27	25
拉伸强度（横向）/MPa	45	14	11
断裂伸长率（纵向）/ %	449	393	284
断裂伸长率（横向）/ %	532	511	500

检测项目	PE	PE/CaSO₄	PE/CaCO₃
拉伸强度（纵向）/MPa	63	27	25
拉伸强度（横向）/MPa	45	14	11
断裂伸长率（纵向）/ %	449	393	284
断裂伸长率（横向）/ %	532	511	500

样品	总迁移量（70 ℃，2 h）/mg·dm^-2					高锰酸钾消耗量/mg·kg^-1	重金属/mg·kg^-1
样品	水	4 %乙酸	20 %乙醇	95 %乙醇	异辛烷	高锰酸钾消耗量/mg·kg^-1	重金属/mg·kg^-1
PE	0.78	2.0	1.9	2.4	1.5	0.98	＜1
PE/CaSO₄	5.4	6.7	3.1	4.2	5.8	1.2	＜1
PE/CaCO₃	0.83	142.0	2.3	4.1	4.6	1.1	＜1

样品	总迁移量（70 ℃，2 h）/mg·dm^-2					高锰酸钾消耗量/mg·kg^-1	重金属/mg·kg^-1
样品	水	4 %乙酸	20 %乙醇	95 %乙醇	异辛烷	高锰酸钾消耗量/mg·kg^-1	重金属/mg·kg^-1
PE	0.78	2.0	1.9	2.4	1.5	0.98	＜1
PE/CaSO₄	5.4	6.7	3.1	4.2	5.8	1.2	＜1
PE/CaCO₃	0.83	142.0	2.3	4.1	4.6	1.1	＜1

检测项目	PE/CaSO₄	PE/CaCO₃
拉伸断裂伸长率保留率（纵向）/ %	1.1	1.6
拉伸断裂伸长率保留率（横向）/ %	0.2	0.3
重均相对分子质量下降率/ %	81.5	71.7
光降解后重均相对分子质量＜ 10 000的分子百分含量/ %	33.2	16.1

Study on application performance of polyethylene/CaSO₄ nanoparticle composite flexible packaging

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