Welcome to the official website of Weifang Haililong Magnesium Industry Co., Ltd.

CN  EN  |  

氢氧化镁

contact us

National Service Hotline:

+86-536-7262862 

Weifang Haililong Magnesium Industry Co., Ltd.

Sales Dept. 1

Mr. Liu:+86-15866145532   

E-mail:15863672679@163.com

Sales Dept. 2

Mr. Bi:+86-15864580750   

E-mail:15864580750@163.com

Foreign Trade Dept.

Mr. Han:+86-15866145532   

E-mail:15866145532@163.com

Tel:+86-536-7262862

Fax:+86-536-7262861

Factory address:Hetan Industrial Park, Hanting District, Weifang City, Shandong Province

Marketing department address:Block B, Chenshuo Building, Commercial Street, Hanting District, Weifang City, Shandong

Website:www.hellonmy.com

Website:en.hellonmy.com

current position: home >> News >> Knowledge tips

A small solution to the knowledge of Helilong-basic requirements flame retardant mechanism of flame retardants

2020-04-02 17:10:14
Times

Basic requirements for flame retardants


The flame retardant efficiency is high, the amount needed to obtain the unit flame retardant efficiency is small. That is, the performance/price ratio is high.


It is low almost non-toxic. The amount of toxic corrosive gases generated during combustion is as small as possible, it is environmentally friendly.


It has good compatibility with the flame-retardant substrate is easy to migrate ooze. The flame retardant materials can be recycled recycled.


It has a sufficiently high thermal stability does decompose at the processing temperature of the flame-retardant substrate, but the decomposition temperature should be too high, preferably between 250 400°C.


Do excessively deteriorate the processing performance of the flame-retardant substrate the physical-mechanical electrical properties of the final product. The flame retardant with excellent performance reasonable flame retardant formula is to find a harmonious unity between the flame retardancy practicality of the material.


With acceptable light stability.


The source of raw materials is sufficient, the manufacturing process is simple, the price is low.


Flame retardant mechanism


The flame retardant exerts its flame retardant effect through several mechanisms, such as endothermic effect, covering effect, chain reaction inhibition, suffocation effect of non-combustible gas, etc. Most flame retardants achieve the purpose of flame retardant through a combination of mechanisms.


(1) Endothermic effect


The heat released during the heating process heats up the raw materials quickly reaches the ignition point. The principle of endothermic flame retardant is that the material needs to absorb a lot of heat during the combustion process, which can reduce the heating process of the material, so that the gasified combustible molecules are cracked It is difficult for the free radicals to reach the ignition point, thus inhibiting the combustion to a certain extent.


(2) Coverage


The high temperature generated when the material burns causes the flame retardant to form a glass-like stable foam coating to isolate oxygen,


This will only insulate heat oxygen, but also prevent the combustible gas overflowing, so as to achieve the purpose of flame retardancy. Organic phosphazene flame retardants crosslink form a carbonized layer when heated. In this way, on the one hand, it can prevent the polymer further pyrolysis, on the other hand, it can prevent the internal heat decomposition products entering the gas phase to participate in the combustion.


(3) Inhibition of chain reaction


According to the chain reaction theory of combustion, it is free radicals that are needed to maintain combustion. The flame retardant can act on the gas-phase combustion zone to capture the free radicals in the combustion reaction, thereby preventing the flame spreading, reducing the flame density in the combustion zone, finally terminating the combustion reaction rate.


(4) Suffocation effect of incombustible gas


The flame retardant decomposes non-combustible gas when heated, dilutes the concentration of combustible gas decomposed by combustibles below the lower limit. At the same time, it also has a dilution effect on the oxygen concentration in the combustion zone, preventing the continuation of combustion achieving the effect of flame retardancy.


Magnesium hydroxide, as an inorganic flame retardant, achieves the purpose of flame retardancy through the combined effects of heat absorption, covering asphyxiation of non-combustible gas.



氢氧化镁阻燃剂

label

Recently Viewed:

Contact us
WeChat

氧化镁

Mobile

氢氧化镁

Address: Block B, Chenshuo Building, Commercial Street, Hanting District, Weifang City, Shandong

+86-536-7262862