Polyvinyl chloride (PVC) is a widely used chemical raw materials, generally divided into soft plastic polyethylene and hard plastic polyethylene two kinds.Among them, the hard plastic polyethylene itself has self-extinguishing, but the soft plastic polyethylene because a lot of plasticizer is added to improve the production and processing performance indicators and toughness and plasticity, so that the system can greatly reduce the level of flame retardancy.
In addition, the product incineration process will also produce a lot of harmful smoke, threatening the safety of our lives and property.Inorganic halogen free flame retardant technology is the development ideal pollution-free halogen-free flame retardants, halogen-free flame retardant type magnesium hydroxide as one important product, with non-toxic, smoke suppression and less volatile corrosion, good heat resistance and does not produce the advantages of the exhaust gas, apply the present stage of halogen free flame retardant efficiency, flame retardant grade, low smoke, low toxicity weiwei.
Magnesium hydroxide is widely used in the flame retardant grade industry of high polymer compounds due to its high decomposition heat and high efficiency in promoting the carbonization effect of basic material materials and strong acid removal level.Because of the small amount of magnesium hydroxide powder, the affinity between it and the polyethylene system is poor, resulting in poor dispersibility, which greatly reduces the mechanical properties of the mechanical materials of the system.
Besides, after modification, the surface layer of the modified m-level powder will be covered with an extra layer of organic compounds, which can improve the adaptability of the polyethylene system and thus improve the mechanical properties of the system's mechanical materials on the corresponding layer level.
In addition, due to the small fineness and high thermal conductivity of magnesium hydroxide in unmodified nanotechnology, it is very easy to agglomerate and produce agglomerates. As a result, the ratio of magnesium hydroxide powder in the polyethylene system is not even, and the flame retardant level of magnesium hydroxide is lower than that of the non-modified and modified magnesium hydroxide halogen free flame retardant in the polyethylene system.
The modified nano-tech magnesium hydroxide powder solves the defect of easy agglomeration due to its reduced thermal conductivity, which promotes magnesium hydroxide to have a good dispersion in the polyethylene system. Therefore, the flame retardant level is increased. Although the adverse effect of mechanical properties of mechanical materials is greatly reduced, it shows the advantages of nano powder.Nanotechnology magnesium hydroxide powder and magnesium hydroxide powder both have different laminating degrees on the mechanical properties and flame retardant level of the polyethylene system.
After surface modification of magnesium hydroxide by nanotechnology, the adaptability and dispersity of the magnesium hydroxide in the polyvinyl chloride system were improved on the corresponding laminar degree, thus improving the flame retardant rating of the system.In addition, it can reduce the adverse effect on mechanical properties of mechanical materials.