Exploiting high phosphorus content of phytic acid, it was grafted onto magnesium hydroxide (MH) by neutralization reaction to obtain MGPA, a flame retardant. A current study investigated the effect of MGPA on hydrophobicity, flame retardancy, and mechanical properties of MGPA-linear lowdensity polyethylene (LLDPE) composites. The LLDPE composite with 50 parts of MGPA has the better flame retardancy and thermal stability with a limiting oxygen index of 23.3%, which is higher than that of neat LLDPE (17%). In addition, MGPA could effectively promoted LLDPE to form a continuous and compact char residue during combustion, which reduce the peak of heat release rate and total smoke production value of LLDPE composite by 70% and 36%, respectively, and the char residue rate increase to 67.5%. Furthermore, the maximum of loss-rate showed by LLDPE composite with MGPA reduce to 1.25%/min while the value of LLDPE composite with MH is 1.8%/min. Meanwhile, the LLDPE composite with MGPA show remarkable elongation at break and hydrophobicity, which are 398% and 99 , respectively. In addition, this study presents a substantial flame retardancy and interfacial compatibility of MGPA for extending the applications of flame-retardant LLDPE composites.

In this paper, a new bio‐based flame retardant MHPA was prepared by the reaction of magnesium hydroxide (MH) and phytic acid (PA). Then the crosslinked high‐density polyethylene (HDPE) flame‐retardant composite was prepared by adding it and silicone rubber (SR) into HDPE and using electron beam irradiation. The test results of limiting oxygen index (LOI) and cone calorimeter test (CCT) show that the combination of MHPA and SR can increase the flame retardancy and smoke suppression performance of HDPE. The LOI of HDPE composite with 10 parts of SR is 28.3%, and its pHRR, THR and TSP values are reduced to 454.1 kW/m2, 99.7 MJ/m2 and 8.3 m2, respectively, which is because MHPA and SR jointly promote the formation of continuous and high‐density carbon slag in the combustion process of HDPE and inhibit the penetration of flame. In addition, the HDPE composite with 10 parts of SR has significant tensile strength, elongation breaking strength and tear strength, because SR can produce continuous stable structure with HDPE after irradiation and crosslinking. Therefore, this study verified that MHPA and SR together can effectively improve the flame retardancy, smoke suppression and mechanical properties of HDPE composite.

In this article, ethylene vinyl acetate/aluminum hydroxide/melamine cyanurate (EVA/ATH/MCA) composites were prepared by melt blending, and the crosslinking ability of EVA composites was improved by electron beam irradiation. When the ratio of ATH to MCA is 2:3, compared with the sample added with MCA only, the peak heat release rate, total heat release, and total smoke production of EVA composites are reduced by 30%, 45.9%, and 42%, respectively, and the residue content is increased to 18.1%. At the same time, CO production and CO 2 production are reduced, limiting oxygen index and UL-94 are increased to 27.3% and V-1 level. The flame-retardant effect is significantly improved. In the combustion process, the gas generated by MCA decomposition can act as a "foaming agent," which expands the thermal insulation layer composed of aluminum oxide and carbon residue generated by ATH decomposition, and enhances the flame-retardant effect of condensed phase. In addition, compared with the samples before irradiation, the mechanical properties and wear resistance of EVA composites after irradiation crosslinking are improved. When the addition ratio of ATH and MCA is 2:3, the maximum tensile strength can reach 16.5 MPa.

A novel bio-based flame retardant, MHPA, was synthesized with magnesium hydroxide (MH) and phytic acid (PA) and was added to low-density polyethylene (LDPE) with melamine cyanurate (MCA) to investigate the flame retardant, mechanical property and thermal stability of the LDPE composites. The limit oxygen index (LOI) and cone calorimeter test (CCT) results showed that the combination of MHPA and MCA can increase the LOI of LDPE composite to 21.6%, and its peak of heat release rate (pHRR), total heat release (THR) and total smoke production (TSP) values reduced by 46.8%, 20%, and 31.6% respectively compared with pure LDPE, while the residue after CCT was increased to 24.4%. Moreover, the addition of MCA can effectively improve the thermal stability of LDPE/MHPA composites and suppress their early decomposition.

In this article, MHPA, a novel bio-based flame retardant, was prepared by a reaction of magnesium hydroxide (MH) and phytic acid (PA). Then, MHPA was added into high-density polyethylene (HDPE) to prepare flame-retardant HDPE composite. This work aims to add MHPA into HDPE to flame-retardant HDPE composites by melt blending to significantly reduce the smoke and toxic gases produced during combustion. The limiting oxygen index (LOI) and cone calorimeter test (CCT) results show that the flame retardancy and smoke suppression of HDPE can be improved by the mixture of MHPA and MH. The LOI of HDPE/MHPA/MH was 26.3%, and its peak heat release rate (pHRR), total heat release (THR) and total smoke production (TSP) values decreased by 38.6%, 27.3%, and 65.2%, respectively, compared with pure HDPE. In addition, HDPE/ MHPA/MH composites have significant tensile strength, elongation breaking strength, and tear strength because of the interface compatibility of bio-based MHPA. Therefore, this study verified that the flame retardancy, smoke suppression, and mechanical properties of HDPE composites could be effectively improved when MHPA and MH are added to HDPE simultaneously.