Research progress and application of brucite powder to improve flame retardant properties of epoxy resin
Brucite powder, as an efficient and environmentally friendly inorganic flame retardant, has shown significant potential in improving the flame retardant properties of epoxy resins in recent years. This article comprehensively analyzes the effect of brucite powder on the flame retardant properties of epoxy resin and its mechanism of action, and reviews the latest research progress in related fields, aiming to provide new solutions for the flame retardant application of epoxy resin.
Flame retardant effect of brucite powder
Brucite powder (Mg(OH)2) can significantly enhance the flame retardant properties of epoxy resin due to its endothermic decomposition characteristics at high temperatures. Experimental data shows that when 30 parts of brucite powder is added, the carbon residual amount of the epoxy resin increases from the original 5% to 15%. This change is attributed to the fact that brucite powder releases moisture during the combustion process and forms a layer of magnesium oxide on the surface of the material, effectively slowing down the burning rate of the material.
Synergistic effect of brucite powder and zinc borate
Adding brucite powder and zinc borate (ZB) simultaneously to epoxy resin can significantly improve the flame retardant effect of the material. The epoxy resin composite containing 6 parts of ZB has a residual carbon content of 25%, and the initial decomposition temperature is higher than that of the sample containing only brucite powder, which proves that the addition of ZB helps to enhance the thermal stability of the composite. .
Surface modification of brucite powder
Surface modification is a key step to improve the compatibility between brucite powder and epoxy resin. Surface treatment of brucite powder with a silane coupling agent can not only improve its uniformity of dispersion in epoxy resin, but also enhance the mechanical properties and flame retardant efficiency of the composite material. Modified brucite powder can significantly improve the hardness and scratch resistance of epoxy resin.
The specific effect of brucite powder on the flame retardant properties of epoxy resin
The experimental results show that as the addition amount of brucite powder (MH) reaches 3wt.%, the peak heat release rate (pHRR), peak smoke generation rate (pSPR), Carbon monoxide production (pCOP) and carbon dioxide production (pCO2P) decreased by 62%, 47%, 71% and 63% respectively. These data show that an appropriate amount of one-dimensional brucite powder can greatly improve the flame retardancy and fire safety of epoxy resin.
Flame retardant mechanism of brucite powder
The main flame retardant mechanisms of brucite powder include: diluting the combustible gas and oxygen concentration in the flame area by releasing a large amount of water vapor; forming a protective layer of magnesium oxide, which acts as a barrier to heat transfer and preventing the inward transfer of heat; and converting the polymer The CO produced by decomposition is converted into CO2, reducing the emission of harmful gases.
Brucite powder is not only an effective environmentally friendly flame retardant, but also can significantly improve the basic physical properties of epoxy resin through appropriate surface modification and combined use with other flame retardants. Flame retardant performance. Future research and development work will focus on optimizing the addition ratio and modification technology of brucite powder in order to achieve better flame retardant effects.