PROPERTIES OF COMPOSITE BASED ON HIGH DENSITY POLYETHYLENE/ETHYLENE VINYL ACETATE BLEND AND A NOVEL ORGANIC MODIFIED WASTE GYPSUM

Tran Huu Trung, Mai Duc Huynh, Do Van Cong, Nguyen Vu Giang

Abstract


In this study, waste gypsum (WGS) was used as the filler in blend of high density polyethylene (HDPE) and ethylene vinyl acetate copolymer (EVA) in order to improve the flame resistance of this composite. After modification by ethylene bis stearamide (EBS), modified gypsum (EGS) at various contents was dispersed into HDPE/EVA blend by melt-mixing method to obtain EGS/HDPE/EVA composites. The IR analysis of the EGS showed the interaction between EBS and gypsum. The difference in morphology of HDPE/EVA/EGS and HDPE/EVA/OGS composites was also observed in SEM images. By adding EGS and small amounts of flame retardant additives such as ammonia polyphosphate and zinc borate, the thermal stability and the flame resistance of HDPE/EVA/EGS composites have improved and classified at V2 grade of UL94 standard. Moreover, the second self extinguishing time (t2) of EGS composite is shorter than that of unmodified gypsum (OGS) composite because of the quality char forming after the fist burning and it plays a role as thermal barriers to protect material from heat of the second ignition. About mechanical properties, both tensile strength and elongation at break of the composite decreased with increasing the gypsum content and flame retardant additives because of filler aggregation.


Keywords


waste gypsum, HDPE, EVA, flame resistance, ethylene bis stearamide

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References


Hanan Tayibi et al., Envionmental impact and management of phosphogypsum, Journal of Environmental Management 90 (2009) 2377-2386.

Suarez, S., Roca, X., Gasso, S., - Product-specific life cycle assessment of recycled gypsum as a replacement for natural gypsum in ordinary Portland cement, J. Clean. Prod. 117 (2016) 150-159.

Nisti M.B. et al., Lixiviation of natural radionuclides and heavy metals in tropical soils amended with phosphogypsum. Journal of Environmental Radioactivity 144 (2015) 120 126.

Rodrigo H. Geraldo et al. Gypsum plaster waste recycling: A potential environmental and industrial solution, Journal of Cleaner Production 164 (2017) 288-300.

Myung Yul Kim et al., Mechanical Properties of PVC Complex Using Waste-Gypsum Fillers, Joural of KASBIR, 4 (2003) 92-97.

Thai Hoang, Tran Huu Trung, Nguyen Vu Giang, Weathering and combustion resistance of modified waste gypsum and high density polyethylene composite, 50 (6B) (2012) 167-170.

Thai Hoang et al., Preparation and study on properties, structure of composite based on polyethylene and organic modified phosphogypsum , Vietnam Journal of Chemitrsy 49 (3) (2011) 291-295.

Khuong Viet Ha et al., Study on properties and morphology of polyethylene /ethylene vinyl acetate copolymer/sodium dodecyl sulphate modified gypsum 54 (1A) (2016) 72-79.

Yang Chen et al., Melting and crystallization behavior of partially miscible high densitypolyethylene/ethylene vinyl acetate copolymer (HDPE/EVA) blends, Thermo Chimica Acta 586 (2014) 1-8.

O. Tugb et al., Thermal degradationmechanisms of aluminium phosphinate, melamine polyphosphate and zincborate in poly(methyl methacrylate), Polymer Degradation and Stability 96 (10) (2011)1780–1787.

L.L.Pan et al., Fire retardant mechanism analysis between ammonium phosphate and triphenyl phosphate in unsaturated polyester resin, Polymer degradation and stability 97 (2012) 1801-1806.

Test for Flammability of Plastic Materials for Parts and Devices and Appliances, North brook, IL: Underwriters Laboratories Inc. United States Patent, 1997.




DOI: https://doi.org/10.15625/2525-2518/56/3B/12915

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