An Adhesive Material with Framework Structure Based on Ethylene⁃vinyl Acetate Copolymer Nanofibers

doi:10.19491/j.issn.1001-9278.2020.06.006

Abstract

Abstract:

In this study, a solution was offered for the difficulty in electrospinning of ethylene?vinyl acetate copolymer (EVA) nanofibers by introduction of inorganic salts, and an adhesive material with a framework structure was obtained based on this nanfibers. A series of composites was prepared by hot compression with an EVA nanofiber sheet between two polypropylene melt?blown nonwoven layers, and the effect of hot pressing temperature on their shear strength was investigated. Furthermore, the tensile properties and air filtration efficiency were evaluated for the composites obtained at the optimum temperature. The results indicated that the EVA nanofibers exhibited a good morphology when prepared at a spinning solution concentration of 6 wt%, a CHCl₃/THF mass ratio of 7/3, and a LiCl addition amount of 0.2 wt%. The composites achieved the maximum shear strength at the hot pressing temperature of 80 °C, and their air filtration efficiency reached over 98.71 %. Such a value was evidently greater than the filtration efficiency of the 4?layer commercial melt?blown mask cloth. Compared to uncompounded melt?blown fabrics, there is a significant improvement in the mechanical properties for the composites prepared in this work.

Key words: adhesive, electrospinning, ethylene?vinyl acetate copolymer, lithium chloride, filter

CLC Number:

TQ322

Man LI, Dingsheng WU, Jiali LI, Jinyan HU, Kefu WANG, Quan FENG. An Adhesive Material with Framework Structure Based on Ethylene⁃vinyl Acetate Copolymer Nanofibers[J]. China Plastics, 2020, 34(6): 34-39.

Figures/Tables 6

References 22

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纺丝液浓度/%	剪切速率/s^-1	黏度/Pa·s
2	21.50	0.0030
4	21.50	0.0732
6	21.50	0.1028
8	21.50	0.3848

纺丝液浓度/%	剪切速率/s^-1	黏度/Pa·s
2	21.50	0.0030
4	21.50	0.0732
6	21.50	0.1028
8	21.50	0.3848

样品	断裂强力/N	断裂伸长率/%
熔喷/EVA复合材料	31.18±1.31	20.35±0.47
双层熔喷布	18.10±0.231	22.71±0.39

样品	断裂强力/N	断裂伸长率/%
熔喷/EVA复合材料	31.18±1.31	20.35±0.47
双层熔喷布	18.10±0.231	22.71±0.39

样品	过滤效率/%	透气率/mm·s^-1
熔喷/EVA复合材料	98.71±0.95	73.82±0.46
双层熔喷布	72.15±6.63	114.82±6.78
商用4层熔喷口罩布	74.91±3.75	38.90±0.99