An Environmentally Friendly Nanohybrid Flame Retardant with Outstanding Flame-Retardant Efficiency for Polypropylene

Abstract

A facile method to fabricate nanohybrid flame retardants has become increasingly important to enhance the flame-retardant efficiency and adhesion in interfaces between polymer matrix and the flame retardants. Polypropylene (PP) is a vital thermoplastic polymer family member; however, its flame retardancy remains a big challenge because of its other seriously deteriorated properties. In this present work, an environmentally friendly nanohybrid expandable graphite (nHEG) has been successfully designed and synthesized in situ via a one-pot strategy of the first flame-retardant PP by introducing nano-SiO2 particles into the surface and interlamination of graphite lamellas. The performance of PP composites is modulated through regulating nHEG content and nano-SiO2 distribution as the catalytic charring agent, and expandable graphite (EG) is used to be the flame-retardant unit in the synthesis process. PP composites obtain the UL-94 V0 rating by the UL-94 test. The enhanced flame retardancy can be attributable to the formation of continuous and tight char residues. The sample with the highest flame retardancy maintains a tensile strength of 32.7 MPa and 9.3 kJ/m2 of notched impact strength, respectively. Therefore, the nanohybrid flame-retardant PP composites show extensive applications.

Synthesis of a Reactive Template-Induced Core–Shell PZS@ZIF-67 Composite Microspheres and Its Application in Epoxy Composites

“…In addition, the phosphorus and nitrogen compounds and carbonized aromatic networks formed during the EP/PZS@ZIF-67 combustion process endow the residual char with higher thermal stability and compactness. EP/PZS@ZIF-67 composites show the higher graphitized and more residual char, which is considered an ideal protective barrier layer to effectively suppress the gas and thermal energy exchange between the interior matrix and exterior environment [ 47 , 48 ]. The designed PZS@ZIF-67 core–shell structure presents a large specific surface area, which may increase the interaction area with pyrolysis products that promote physical and chemical adsorption and catalytic reactions.…”

“…interior matrix and exterior environment [47,48]. The designed PZS@ZIF-67 core-shell structure presents a large specific surface area, which may increase the interaction area with pyrolysis products that promote physical and chemical adsorption and catalytic reactions.…”

Effect of environment‐friendly intercalated Coal and coal gangue on flame‐retardant, antistatic, and mechanical properties of poly(vinyl chloride)/acrylonitrile–styrene–acrylate composites

“…Generally, a higher carbon yield is necessary to exert better flame-retardant properties on materials. [35] In addition, the final char yield was significantly improved after the incorporation of M-Coal and A-Coal. PVC/A-SA/15A-Coal possessed a higher carbonizing ability than PVC/ASA/15M-Coal.…”

Flame Retardant Properties and Mechanical Properties of Polypropylene with Halogen and Halogen-Free Flame Retardant System

“…Polypropylene (PP) is a versatile plastic that is used in a wide range of industries such as construction materials, household goods, automobiles and electrical and electronic appliances. As polymeric materials, they have many advantages that are incomparable to other materials, but one significant disadvantage limits their application: they are flammable materials, especially when used as construction materials and electronic and electrical materials, and are a serious potential fire hazard [1]. The main brominated flame retardants commonly used in the market for flame retardant modified polypropylene are decabromodiphenyl oxide (DBDPO) and tetrabutylammonium bromide (TBAB).…”