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Flame Retardant Introduction

Flame Retardant Introduction

Comparison of flame retardant performance of ATH and MH

Comparison of flame retardant performance of ATH and MH

  • 2020-04-22

Magnesium hydroxide is an inorganic flame retardant and smoke suppressant with high loading and addition. Its flame retardant mechanism is: when magnesium hydroxide is heated at 340-490℃, it will decompose and absorb the heat on the surface of the combustion to achieve the flame retardant effect; at the same time, it releases a lot of water to dilute the oxygen on the surface of the combustion, and the activated magnesium oxide generated by decomposition Will adhere to the surface of combustibles, further preventing the progress of combustion. In the entire flame retardant process, magnesium hydroxide did not produce any harmful substances, and the decomposed products can absorb a large amount of harmful gases and smoke generated by the combustion of polymers such as plastics and rubber while being flame retardant. Activated magnesium oxide continuously absorbs the incompletely burnt molten residue, while quickly preventing combustion, eliminating smoke and preventing molten droplets, it is an emerging environmentally friendly inorganic flame retardant. Magnesium hydroxide is a non-toxic, odorless, non-corrosive white powder with a thermal decomposition temperature of 390-430°C. It is widely used in PP, PVC, PE, PS, PA, PC, ABS, EVA and other plastic rubbers. It is widely used in flame retardant insulation and sheath materials for wire and cable, fireproof fillers, injection molding master batch, etc. It is also used in paints, coatings and unsaturated polyesters.

Hefei Zhongke flame retardant new materials Co.,ltd as a professional filling flame retardant manufacturer, produce kinds of grades magnesium hydroxide with 99% purity, particle size 1-5 micron.

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Aluminum Hydroxide (ATH), also known as alumina trihydrate, has a relative density of 2.42 and a relative mass of 78.00. It is a non-toxic and odorless white powder. Above 200℃, it will lose water and become alumina, insoluble in water or alcohol, soluble in hot sulfuric acid, hydrochloric acid and alkali. At 230 ~ 330℃, aluminum hydroxide is dehydrated by heat, and the precipitation of crystal water is divided into three stages. In the first stage, the endothermic peak is around 230℃, which is equivalent to the partial dehydration of alumina trihydrate converted into monohydrate alumina; in the second stage, the endothermic peak is around 300℃, which is equivalent to the further dehydration transition of alumina monohydrate It forms crystalline alumina; in the third stage, the endothermic peak is around 500℃, which is equivalent to the further decomposition and conversion of alumina monohydrate into Al2O3. Aluminum hydroxide is widely used in flame retardant PE, PP, EVA, HIPS, PVC, ABS, epoxy resin, acrylate, unsaturated polyester, flexible polyurethane foam, coating, rubber, latex, etc. Used as PA flame retardant.

Aluminum hydroxide often needs to be used in combination with other flame retardants when it is flame retardant. The flame retardant efficiency of a single aluminum hydroxide is not enough, but for substrates with strict addition requirements, a large amount of aluminum hydroxide will affect the substrate Flame retardant performance and other properties have an impact.

Final theory

First agreed that aluminum hydroxide and magnesium hydroxide are two important inorganic flame retardants, and their common characteristics are environmentally friendly, flame retardant, smoke suppression and filling functions. However, aluminum hydroxide is one of the earliest inorganic flame retardants. As a flame retardant, aluminum hydroxide has the characteristics of good stability, non-toxicity, no corrosive gas, long-lasting flame retardant effect, and high whiteness of the product. The main difference between magnesium hydroxide and aluminum hydroxide is that magnesium hydroxide has a high decomposition temperature and can be used under conditions where the processing temperature is high. Its anti-reduction ability and strength are better than aluminum hydroxide, but its flame retardant is slightly weaker than aluminum hydroxide.

Hefei Zhongke flame retardant new materials Co.,Ltd has 17 years experience for manufacturing flame retardant materials including ATH, MH,welcome to visit our factory or

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