TCEP flame retardant in the fire is how to achieve flame retardant

In recent years, plastic, rubber, synthetic fiber and other polymeric materials and their products have developed rapidly, but they are mostly flammable and combustible. Once a fire occurs, they often suffer heavy losses and are accompanied by casualties. During incineration, the release rate is large, the calorific value is high, the flame spreads fast, it is not easy to extinguish, and sometimes there are toxic gases. Therefore, it is important to add TCEP flame retardant to these combustible materials for flame retardant treatment, let's understand how TCEP flame retardant achieves flame retardant in fire!

Flame retardant principle of TCEP flame retardant

TCEP flame retardant, also known as halogen-free flame retardant, flame retardant to give flammable polymer flame retardant functional additives are mainly designed for the flame retardant polymer materials. The principle is to add flame retardants in the production of various products to effectively prevent the spread of flames and reduce the speed of fire.

TCEP flame retardants play three main roles in fire:

1. The role of coverage

TCEP flame retardant is added to combustible materials, which is to prevent the further thermal decomposition of the polymer on the one hand, and on the other hand to prevent the internal thermal decomposition products from participating in the combustion process of the gas phase, which can be isolated from oxygen in a crystalline state at high temperatures. It has the effects of heat insulation, oxygen isolation, and preventing the escape of combustible gases to achieve the purpose of flame retardant.

2. Inhibit chain reaction

According to the reaction theory of the combustion chain, what is needed to sustain combustion is free radicals. For halogen flame retardants, the evaporation temperature is the same as or close to the decomposition temperature of the polymer. After the polymer is decomposed by heat, the flame retardant volatilizes at the same time, captures the free radicals in the combustion reaction, and prevents the flame from spreading. The environmentally friendly flame retardant can be used in the gas phase combustion zone to prevent the flame from spreading, reduce the flame density in the combustion zone, reduce the combustion reaction speed, reduce the flame density in the combustion zone, and reduce the combustion reaction speed until the end.

3. Aphyxiation without the use of gases

The thermal decomposition of TCEP flame retardant is not conducive to the combustion gas. By reducing the concentration of combustible gas below the lower limit of combustion, the oxygen concentration in the combustion zone is diluted to prevent the combustion from continuing, and the flame retardant effect is achieved.

What are the factors that affect the flame retardant effect of TCEP flame retardant:

One. human factors

The addition amount of the flame retardant in the extrusion molding plate is very small, generally less than 10%. In order to uniformly distribute the flame retardant in the material, stirring is an important part. In order to make every 100 grams of raw materials evenly contain about 5 grams of flame retardant, and the upper machine, despite stirring, but in a short period of time it can only form a small area of dispersion, need a lot of artificial mixing or special mixer mixing, many manufacturers directly spray flame retardant on the surface of raw materials directly into the upper machine.

II. Equipment Elements

Different equipment manufacturers have different design technologies for screw packing clearance, advancing speed, and plasticizing and dispersing screw blocks, and the plasticizing, dispersing, and residence time of the material in the screw packing are also different.

Three. flame retardant factor

There are mainly two kinds of flame retardants produced in China: powder and particles. Most of them precipitate at the bottom of the mixing equipment along the particle gap, resulting in uneven dispersion of the flame retardant. The powder adsorbed on the surface of the particles first contacts with the screw barrel and decomposes seriously. Due to the different density and PS particles, the powder flame retardant can only adsorb a small part through friction and electrostatic adsorption during the mixing process. During the decomposition, free bromine reacts with the screw barrel to cause iron bromide to fall off, it is highly corrosive to the equipment and is not recommended.