Classfication and Application of Carbon Black

 

Classfication

The classification of various carbon black is often related to its production methods, such as channel black, furnace black and thermal black.

 

Furnace carbon black production process: carbon black is generated by incomplete combustion or pyrolysis of natural gas or high aromatic oil in the reactor. This kind of carbon black is called furnace black, which is the largest and most variety of carbon black varieties. The significant difference between furnace black and channel black and thermal black is that the degree of fusion or coalescence of the particles can be adjusted according to different uses. Therefore, the furnace black of the same particle size range is divided into several derivative varieties with different structures. In addition, the oxygen content of furnace black is usually lower than that of channel black (less than 1%), and the surface is neutral or weakly alkaline.

 

 

Furnace Black

 

The characteristic of furnace black production is that the fuel is burned in the reactor to provide the heat required for the cracking of the feedstock. Combustion and pyrolysis processes occur simultaneously. According to the different forms of raw materials used, the production of furnace black can be divided into gas furnace method and oil furnace method. The raw material and fuel used in the gas furnace process are natural gas. The fuel of the oil furnace process can be natural gas, coke oven gas, or liquid hydrocarbon, and the raw material is high aromatic oil, such as ethylene tar and anthracene oil. In the furnace black production process (see figure), the reactor is the core equipment. The production of different kinds of furnace black requires the use of different structure and size of the reactor. Air and fuel are burned in the reactor, the raw material is atomized into the burning flame, and the carbon black is generated by high temperature pyrolysis. Black carbon is suspended in the residual gas to form smoke. After the flue gas is quenched, it is sent to the air preheater and the oil preheater for further cooling, and finally into the bag filter, and the separated carbon black is sent to the granulator for granulation, and then dried in the dryer.

 

Channel Black

Channel carbon black production process: with natural gas as the main raw material, with channel steel as the flame contact surface to produce carbon black, such carbon black is called channel black. Compared with furnace black and thermal black, the particles are finer and the specific surface area is larger. At the same time, due to the use of specific production methods, its surface is oxidized and contains more oxygen-containing functional groups and becomes acidic. The degree of coalescence of such carbon black particles is low. Because it contains more oxygen-containing functional groups, it can delay the vulcanization rate of rubber, improve the weather resistance of polyolefin, and give the ink good fluidity and printing performance.

 

Thermal Black

Thermal cracking carbon black production process: Natural gas, coke oven gas or heavy liquid hydrocarbons as raw materials, in the absence of oxygen, flame, through high temperature pyrolysis to produce carbon black, called thermal cracking black. It is the lowest type of specific surface area of carbon black varieties, basically exists as a single spherical particle, does not fuse or gather into aggregates, and its surface oxygen content is also very small (0.1% ~ 0.3%). There are three main varieties of thermal black: medium thermal black, non-polluting medium thermal black and fine thermal black. The specific surface area of nitrogen adsorption is 6 ~ 10m2/g for medium thermal black and 10 ~ 15m2g for fine thermal black.

 

The Difference in Application

It is mainly used as a reinforcing agent and filler for rubber, and its consumption is about half of the rubber consumption, and the carbon black for rubber accounts for 94% of the total carbon black, of which about 60% is used for tire manufacturing. In addition, it is also used as a colorant for inks, coatings and plastics, and as a UV screen agent for plastic products. It is also an important additive in many other products, such as electrodes, dry batteries, resistors, explosives, cosmetics and polishing pastes.

 

 

 

Rubber Carbon Black

The carbon black used in the rubber industry accounts for about 90% of the total carbon black production. Mainly used in automobile tires, tractor tires, aircraft tires, power tires, bicycle tires and other kinds of tires. Each typical car tire requires about 10 kilograms of carbon black. About three-quarters of rubber carbon black is used in tire manufacturing, and the rest is used in other rubber products, such as tape, hose, rubber shoes, etc. In the rubber products industry, the amount of carbon black accounts for about 40 to 50% of the amount of rubber. Carbon black is used so much in the field of rubber because of its excellent "reinforcing" ability.

Color Black

Pigment carbon black can generally be better colored plastic, can be selected according to the pigment carbon black coloring characteristics or physical and chemical properties, the choice of carbon black coloring variety is basically with the blackness of the finished product must be achieved.

Sealant: Special for automotive sealant, construction sealant, Marine sealant, container sealant, industrial sealant, etc.

Color paste: black synthetic leather color paste, printing color paste, water color paste, paper printing color paste, apple bag paper, PVC color paste, PU color paste, oily color paste.

 

Ink type: high-pigment carbon black integrated machine ink, high-pigment carbon black ink ink, pigment carbon black plastic bag ink, pigment carbon black plastic ink, pigment carbon black plastic composite ink, pigment carbon black plastic gravure ink, pigment carbon black gravure ink, pigment carbon black screen printing ink.

 

Paint category: pigment carbon black metal paint, pigment carbon black plastic paint, pigment carbon black automotive paint, pigment carbon black Marine paint.

 

Paint: pigment carbon black motorcycle paint automotive paint, pigment carbon black high temperature resistant paint, pigment carbon black epoxy floor paint, pigment carbon black anti-corrosion paint, pigment carbon black insulating paint, pigment carbon black heat resistant paint, pigment carbon black alkyd paint, pigment carbon black weather resistant paint, etc.

Mill Recommendation

How to choose carbon black crusher:

 

Jaw crusher: processing fineness in 10 ~ 105mm, maximum processing capacity of 90 t/h.

 

Hammer crusher: processing fineness below 25mm, maximum processing capacity 45 t/h.

 

Box crusher: maximum feed size 600-800mm, fineness of finished products below 50mm, maximum processing capacity of 160 t/h.

 

Mill Selection

 

 

YGM high pressure suspension roll Raymond mill: the output is 0.2~50t/h, and the processing fineness is between 15-325 mesh (fineness can be adjusted at will).

 

HGM three-ring medium-speed micro-grinding: the output is 0.5~45t/h, and the processing fineness is between 325-3000 mesh (fineness can be adjusted at will).