A novel strategy to simultaneously electrochemically prepare and functionalize graphene with a multifunctional flame retardant

Review on flammability of biofibres and biocomposites.

In situ growth of 0D silica nanospheres on 2D molybdenum disulfide nanosheets: Towards reducing fire hazards of epoxy resin

Recent advances for microencapsulation of flame retardant

Firstly cobalt-based metal-organic framework material (Co-MOF) was designed and synthesized; its composition was studied by fourier transform infrared spectroscopy (FTIR) and energy dispersion spectrum (EDS), and the micrographs were observed by scanning electron microscope (SEM). Several burning test results showed that the flame retardant of TPU was obviously improved by the help of combination of 4.5 wt% APP/1.5 wt% Co-MOF. TPU is easily flammable with severe molten drops, so its limited oxygen index (LOI) is only 21.7 and cannot pass any UL-94 grade in vertical burning test. Whereas in TPU/6.0 wt% (4.5APP/1.5Co-MOF) composites, LOI raised to 28.2 and no dripping was produced in vertical burning test, so it passed UL-94 V-0 grade. Similarly, TPU released a large amount of heat and smoke in cone test, peak heat release rate (pHRR) reached 1359 kW m−2 and smoke production rate (SPR) was 0.11 m−2 s−1; however, in TPU/6.0 wt% (4.5APP/1.5Co-MOF) composites, pHRR reduced sharply to 257 kW m−2 and SPR dropped to 0.04  m−2 s−1. Most of all, some mechanical loss caused by the APP were partly recovered by substitutional use of Co-MOF.

Preparation of cobalt-based metal organic framework and its application as synergistic flame retardant in thermoplastic polyurethane (TPU)

A novel and efficient halogen-free composite flame retardant (CFR) consisting of a brucite core and a fine zinc borate [Zn6O(OH)(BO3)3] hierarchical nanostructure shell was designed and synthesized via a facile nanoengineering route. It had been demonstrated that this unique hybrid structure possessed a high BET specific surface area (65 m2/g) and could significantly enhance the interfacial interaction when mixing with ethylene-vinyl acetate (EVA). This improved the transfer of stress between CFR particles and EVA matrix and increased the viscosity of EVA/EVA blends, which was beneficial for droplet inhibition and char forming. The mechanical properties and flammability behaviors of the EVA/CFR blends had been compared with the EVA/physical mixture (PM, with the given proportion of brucite and Zn6O(OH)(BO3)3). The mechanical properties of EVA/CFR blends, especially the tensile strength (TS), presented a remarkable increase reaching at least a 20% increment. Meanwhile, with the same 45 wt % of fillers, the...

Controllable Fabrication of Zinc Borate Hierarchical Nanostructure on Brucite Surface for Enhanced Mechanical Properties and Flame Retardant Behaviors

Nanoengineering of brucite@SiO2 for enhanced mechanical properties and flame retardant behaviors

Nanoengineering core/shell structured brucite@polyphosphate@amine hybrid system for enhanced flame retardant properties

Controllable fabrication of high purity Mg(OH)2 nanoneedles via direct transformation of natural brucite

The invention belongs to the technical field of inorganic functional materials, and provides a preparation method of a synergetic silicon-magnesium composite fire retardant with a core-shell structure. The provided high efficient composite fire retardant with a core-shell structure can be obtained by depositing and coating silicon dioxide with a special nano structure on the surface of a magnesium fire retardant with a size of 1000 to 8000 meshes, and has the advantages of large specific surface area, and stable structure and property. The preparation method has the advantages of simple process, convenient operation, low cost, and easily-controlled technical conditions, moreover, the size of the composite fire retardant particles is adjustable, the nano structure of the surface of the fire retardant particles is controllable, and the mechanical properties and fire retardant performance of the polymer composite material can be prominently improved even if the filling amount is low. When the filling amount is less than 60 wt%, the fire retardant is applied to EVA, the tensile strength is larger than 10.00 MPa, the break elongation is more than 150%, and the national requirements on cable sheath materials can be met. When the filling amount is 50 wt%, EVA can reach the fire retardant UL94-V0 grade, and at the same time, the heat releasing speed of EVA composite material is greatly reduced at the same time.

Xuesong Wang

Papers

Controllable Fabrication of Zinc Borate Hierarchical Nanostructure on Brucite Surface for Enhanced Mechanical Properties and Flame Retardant Behaviors

Nanoengineering of brucite@SiO2 for enhanced mechanical properties and flame retardant behaviors

Nanoengineering core/shell structured brucite@polyphosphate@amine hybrid system for enhanced flame retardant properties

Controllable fabrication of high purity Mg(OH)2 nanoneedles via direct transformation of natural brucite

Preparation method of synergetic silicon-magnesium composite fire retardant with core-shell structure