Carbon Black Applications-N220 N330 N550 N660

Carbon black is a kind of amorphous carbon. Light, loose and extremely fine black powder with a very large surface area, ranging from 10-3000m2/g, is a carbonaceous material (coal, natural gas, heavy oil, fuel oil, etc.) that undergoes incomplete combustion or thermal decomposition under the condition of insufficient air resulting product.


 

What is carbon black?

Carbon black is classified into "reinforcing carbon black", "conductive carbon black" and "wear-resistant carbon black" according to its performance. Carbon black can be used as a black dye for the manufacture of Chinese inks, inks, paints, etc., and is often used as a reinforcing agent for rubber production; carbon black is usually divided into carbon black for pigment, carbon black for rubber, and conductive carbon black according to different uses. and special carbon black.

In 1912, it was found that carbon black has a reinforcing effect on rubber, and since then carbon black has gradually become an indispensable raw material for the rubber industry.

Carbon black generally refers to simple carbon particles. Generally, due to insufficient combustion of organic matter, the hydrogen and oxygen elements in it are converted into water, and the carbon element is not fully burned, and it will be separated from the molecules to form carbon black. Carbon blacks of almost all particle size ranges can be obtained by the furnace black production process. The particle sizes of the same type of carbon black are not exactly the same, showing a particle size distribution range. Generally speaking, the varieties with finer particles have a narrower particle size distribution. The finer the pigment black, the more contact points between the carbon black aggregates, and as a result the stronger the cohesion between them. It will be large to separate the carbon black particles, and finally achieve the highest blackness and coloration.

There are two kinds of density of carbon black, one is true density, which is determined by the elements and structure (or crystal structure) that make up carbon black. Unless otherwise specified, the density of carbon black refers to true density; the other is The pour density or apparent density, which varies with the processing conditions of the carbon black, needs to be determined frequently. Apparent density mainly provides the basis for the volume calculation of engineering equipment and containers such as packaging, storage and transportation.

Carbon black with small particle size and high structure has low pour density. Carbon black with small particles, high structure, pure surface and large surface roughness has good conductivity. Rubber Technology Network has learned that when preparing conductive rubber compounds, the amount of carbon black should not be less than a certain critical value, otherwise too little carbon black in the rubber compound cannot form conductive channels or cause field emission, so that the conductivity of the rubber compound cannot be Meet the requirements.
 

The role of carbon black in rubber

1. Increase wear resistance and service life of rubber products (reinforcing agent)

2. Cost saving, general rubber products are two parts of rubber and one part of carbon black (filler)
 

What is the difference between the uses of various types of carbon black?

Carbon black by application

According to the purpose, it can be divided into two categories: carbon black for rubber and carbon black for pigment

1. Classification of carbon black for pigments

Internationally, according to the coloring ability of carbon black, it is usually divided into three categories, namely high-pigment carbon black, medium-pigment carbon black and low-pigment carbon black. This classification system is often represented by three English letters. The first two letters represent the coloring ability, the latter the production method

For example: high color channel black: HCC (high color channel)

High color furnace black HCF (high color furnace)

The classification of color-like pigments is mainly based on particle size and blackness. High-pigment slot black (10-14nm), medium-pigment slot black (15-27 nm), medium-pigment furnace black (17-27 nm), low-pigment furnace black (28-70 nm)

2. Classification of carbon black for rubber

The naming system takes into account factors such as the vulcanization rate and structure of carbon black compounds, and consists of four systems. The first letter represents the vulcanization rate of the rubber compound. N stands for normal (normal) cure rate, S stands for slow (slow) cure rate. The first letter of the next 3 letters represents the carbon black nitrogen surface area range. The second and third numbers reflect different degrees of structure.

Classification and application of carbon black for rubber

The naming system takes into account factors such as the vulcanization rate and structure of carbon black compounds, and consists of four systems. The first letter represents the vulcanization rate of the rubber compound. N stands for normal (normal) cure rate, S stands for slow (slow) cure rate. The first letter of the next 3 letters represents the carbon black nitrogen surface area range. The second and third numbers reflect different degrees of structure. (these are all set by national standards)

N220

N220 is suitable for all kinds of rubber, and its wear resistance is 10%-20% higher than that of N330. It can endow rubber particles with high tensile strength and tear strength, and has certain electrical conductivity. Mainly used for tread rubber for truck tires and passenger tires, and rubber products that require high strength and high wear resistance.

N234

The wear resistance of N234 is about 10% higher than that of N220, and it can show good wear resistance when used under high severity. Mainly used for high-speed tire tread rubber and high-quality rubber products.

N326

N326 has high tensile strength, tear strength, abrasion resistance and anti-cracking performance in natural rubber. It is mainly used for the tread compound of tires (including off-road tires) that require high strength and low heat generation. It is also suitable for conveyor belts, sealing products and other high-quality rubber industrial products.

N330

N330 is a kind of carbon black with good reinforcing properties, which can impart good tensile properties, tear resistance, abrasion resistance and elasticity to the colloidal particles. Mainly used for tire tread, cord rubber, sidewall and various rubber industrial products.

N339

The reinforcement performance, wear resistance and crack growth resistance of N339 in the tread compound are close to that of N220 carbon black, and it is especially suitable for the combined system of styrene-butadiene rubber and cis-butadiene rubber. Mainly used for passenger tires, truck tire tread rubber, conveyor belts, hoses and various rubber industrial products requiring high wear resistance.

N375

The performance of N375 is basically the same as that of N339, and the heat generation is slightly lower than that of N339. Mainly used for car tires, truck tires and off-road tire tread rubber.

N550

N550 is suitable for natural rubber and various synthetic rubbers. It is easy to disperse, and can impart high stiffness to the rubber compound. The extrusion speed is fast, the mouth expansion is small, and the extrusion surface is smooth. Vulcanized rubber has good high temperature performance and thermal conductivity, as well as better reinforcement performance, elasticity and recovery. Mainly used in tire cord rubber, sidewall, inner tube and extruded and calendered products.

N539

N539 is used in the rubber compound of this product, its extruded surface is smooth, and the mouth shape expansion is small. The tensile strength and elongation of vulcanizate are higher, the tensile stress is lower than that of N550, and the elasticity and fatigue resistance are better. It is mainly used in tire carcass compound, especially for the buffer layer compound mainly composed of natural rubber, and can also be used in tire base compound, tape covering and other rubber products as well as wire and cable sheathing materials.

N660

N660 This product is suitable for all kinds of rubber. Compared with semi-reinforced carbon black, it has a higher structure, finer particles, and is easy to disperse in the rubber compound. The tensile strength, tear strength and elongation stress of vulcanized rubber Higher, and the deformation is small, the heat generation is low, and the elasticity and buckling resistance are good. Mainly used for tire curtain tapes, inner tubes, bicycles, hoses, tapes, cables, footwear and calendered products, model products, etc.
 

Chemical and physical properties of carbon black
Grade	ASTM test	N-220	N-234	N-326	N-330	N-339	N-375	N-539	N-550	N-660
Iodine adsorp. No., g/kg	D 1510	121±5	120±5	82±5	82±5	90±5	90±5	43±5	43±6	36±5
Oil absorption 10-5m3/kg	D 2424	114±5	125±5	72±5	102±5	120±5	1114±5	111±5	121±7	90±5
CTAB absorp. m2/kg	D 3765	111±5	119±5	83±5	82±5	93±5	96±5	41±5	42±5	36±5
Heating loss at 125 °C	D 1509	1,0 max	1,0 max	1,0 max	1,0 max	1,0 max	1,0 max	1,0 max	1,0 max	1,0 max
Ash content %	D 1506	max 1.0	max 1.0	max 1.0	max 1.0	max 1.0	max 1.0	max 1.0	max 1.0	max 1.0
Sieve resiude	D 1514	0.001 max	0.001 max	0.001 max	0.001 max	0.001 max	0.001 max	0.001 max	0.001 max	0.001 max
45 mesh %
Sieve resiude		0.10 max	0.10 max	0.10 max	0.10 max	0.10 max	0.10 max	0.10 max	0.10 max	0.10 max
325 mesh %
Sieve resiude		0.02 max	0.02 max	0.02 max	0.02 max	0.02 max	0.02 max	0.02 max	0.02 max	0.02 max
100 mesh %
Fine Content %	D 1508	max 7	max 7	max 6	max 7	max 7	max 7	max 7	max 7	max 7
pour density kg/m3	D 1513	345±30	320±30	465±30	375±30	345±30	345±30	385±30	360±30	425±30
Sulphur content %	D 1619	1.1 max	1.1 max	1.1 max	1.1 max	1.1 max	1.1 max	1.1 max	1.1 max	1.1 max
Colour strength %	D 3265	115±5	124±5	112±5	103±5	110±5	115±5	-	-	-
Oil absorption 10-5m3/kg, after pressing .	D 3493	100±5	103±5	-	88±5	101±5	97±5	84±5		75±5
pH value	D 1512	7~10	7~10	7~10	7~10	7~10	7~10	7~10	7~10	7~10
Toluol extract%	D 1618	90 min	90 min	90 min	85 min	75 min	75 min	80 min		75 min
Pellet hardness g	D 3303	15-100	15-100	15-100	15-100	15-100	15-100	15-100	15-100	15-100
China selling price  (rmb/ton)	-	6800	7400	6400	6200	-	-	-	6500	6300

 

Carbon Black Processing Machine-HGM micro powder grinding mill

So far, the most suitable grinding mill for processing carbon black is HGM micro powder grinding mill, which can make 325-2500 mesh( 5-45 micron) size . Now we have so many carbon black processing project in India, Turkey, Vietnam, China ,Poland and so on.


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