flame retardant, also known as flame retardant, fire retardant or fire retardant, can improve the safety of various materials. There are many types of flame retardants, and the mechanism of flame retardants is also different,Magnesium hydroxideIt is a new type of environmentally friendly inorganic flame retardant. Compared with other types of inorganic flame retardants, it not only has better smoke suppression effect, but also has multiple functions such as flame retardant, anti-drip, and filling.

Magnesium hydroxide flame retardant is very environmentally friendly. In use, it can neutralize the acidic and corrosive gases generated during combustion. Whether it is used, produced or discarded, magnesium hydroxide will not emit harmful substances during the entire process. Truly environmentally efficient. Therefore, magnesium hydroxide flame retardant has been widely used in all walks of life.

Magnesium hydroxide flame retardant environmental protection, high flame retardant efficiency, has been widely used. In the application, we also have some matters to pay attention:

1. magnesium hydroxide flame retardant must be fully mixed with polymer raw materials in proportion. For example, the use of magnesium hydroxide as a flame retardant to prepare flame retardantPPat the time of makingMg(0H): inPPUniform dispersion, available high-speed mixer, or booth kneader(BussKerlader), Or German-made twin-screw mixing extruder, or reciprocating single-screw mixing extruder to mix, and adopt a reasonable feeding mixing method. For example, allPPand toughening agent and required amount60%Mg(0H): Add the first time to the mixer, mix and mix for a few minutes, and then add the rest for the second time.Mg(0H):. If the mixer is used for mixing, yes.№(0H): In addition to the two-addition method, the charging rate should be accurately measured.87％～93% is better. When the charging rate is less, the mixing effect is poor, and when the charging rate is>95%, easy to causeMg(0H): Agglutination, difficult to disperse evenly.

The general amount of 2. magnesium hydroxide flame retardant is.50However, users can adjust the dosage ratio according to the requirements of different materials and specific flame retardant levels. It is recommended here that when the addition amount exceedsE80%, it can be used in conjunction with other inorganic flame retardants to seek the best synergistic flame retardant effect. For example30% of magnesium hydroxide and30% of aluminum hydroxide synergistic flame retardantPEThe effect is much better than the single use of a flame retardant.(For example, it can be mixed with antimony trioxide, zinc borate, red phosphorus, polyols, etc.).

3., because the molecular negative polarity of magnesium hydroxide is very strong, magnesium hydroxide powder is prone to agglomeration between particles. The result of this phenomenon directly causes magnesium hydroxide to be difficult to disperse and compatible in polymer materials, so ordinary magnesium hydroxide powder can not be used as flame retardant. Magnesium hydroxide used as a flame retardant for polymer materials must be subjected to ultrafine treatment and surface modification treatment by coating with a coupling agent.

4. magnesium hydroxide flame retardant has a strong ability to eliminate smoke. Smoke is the first and most lethal factor in fires and delays the timing of fires.80% is caused by suffocation, so contemporary“Flame retardant”Yes and“smoke suppression”On a par, and for certain polymers suchPVCin terms“smoke suppression”than“Flame retardant”More important. Halogen-containing polymers and halogen flame retardants and antimony compounds are the main sources of smoke, so in addition to the non-halogenation of flame retardants is the main way to reduce the amount of smoke.PVCThe use of halogen-containing polymers with the addition of smoke-eliminating agent hydroxide is another important measure to solve the problem of smoking. General addition amount30% can achieve good smoke suppression effect(If included30%Mg(0H)2ofPPThe smoke density is only non-flame retardantPPof aboutl/3).