The role and classification of carbon black in the rubber industry

The role of carbon black in rubber

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

2, cost savings, the general rubber products are two parts of a piece of carbon black (filler)

What is the difference in the use of various types of carbon black?

Carbon black is classified by use

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

1. Classification of carbon black for pigments

Internationally, according to the coloring ability of carbon black, it is generally classified into three types, namely, high pigment carbon black, medium pigment carbon black, and low pigment carbon black. This classification system is usually represented by three English letters. The first two letters indicate the coloring ability, and the latter one indicates the production method.

High pigment furnace black HCF (high color furnace)

Classification of pigments is mainly based on particle size and blackness. High pigmentation groove black (10-14nm), medium pigmentation groove black (15-27 nm), medium pigmentation furnace black (17-27 nm), low pigmentation furnace black (28-70 nm)

2. Classification of carbon black for rubber

The naming system takes into account the vulcanization rate and structure of the carbon black compound and is composed of four systems. The first letter represents the English letter representing the vulcanization rate of the compound. N represents the normal vulcanization rate and S represents the slow vulcanization rate. The first three letters of the letter represent the range of carbon black nitrogen surface area. The second and third numbers are the degree of structure that reacts differently.

Classification and use of rubber carbon black:

The naming system takes into account the vulcanization rate and structure of the carbon black compound and is composed of four systems. The first letter represents the English letter representing the vulcanization rate of the compound. N represents the normal vulcanization rate and S represents the slow vulcanization rate. The first three letters of the letter represent the range of carbon black nitrogen surface area. The second and third numbers are the degree of structure that reacts differently. (These are all made by national standards)

N220 is suitable for all kinds of rubbers. Its wear resistance is 10%-20% higher than that of N330. It can impart high tensile strength and tear strength to rubber particles and has certain conductivity. It is mainly used for tread rubber for heavy-duty tires and passenger tires, and for rubber products requiring high strength and high wear resistance.

N234 wear resistance is about 10% higher than N220. It can be used under high severity and shows good wear resistance. Mainly used for high-speed tire surface glue and high-quality rubber products.

N326 has high tensile strength, tear strength, abrasion resistance and cleavage resistance in natural rubber. It is mainly used for tires (including off-road tires) with high strength and low heat generation. It is also suitable for conveyor belts, sealing products and other high quality rubber industrial products.

N330 is a carbon black with good reinforcing properties, which can give the rubber particles better tensile strength, tear resistance, abrasion resistance and elasticity. Mainly used in tire tread, cord rubber, sidewall and various rubber industrial products.

N339's reinforcing performance, wear resistance and crack growth resistance in tread rubber are close to N220 carbon black, especially suitable for the combination of styrene-butadiene rubber and butadiene rubber. Mainly used for passenger tires, truck tire tread rubber, conveyor belts, hoses and various rubber industrial products requiring high abrasion resistance.

N375 and N339 have basically the same performance, 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 is suitable for natural rubber and various synthetic rubbers. It is easy to disperse and can impart high stiffness to the rubber compound. It has a fast extrusion speed, small mouth expansion and smooth surface. The vulcanized rubber has good high-temperature properties and thermal conductivity, and is also excellent in reinforcing properties, elasticity and recovery. Mainly used in tire cord rubber, sidewall, inner tube and extruded, calendered product compound.

N539 is used in the compound of this product, and its extrusion surface is smooth, and the mouth shape is small. The vulcanized rubber has higher tensile strength and elongation, lower tensile stress than N550, and better elastic and fatigue resistance. It is mainly used for tire carcass compound, especially for natural rubber-based cushioning compound. It can also be used in tire base rubber, tape covering and other rubber products and wire and cable sheathing materials.

N660 is suitable for all kinds of rubber. Compared with semi-reinforcing carbon black, it has a high structure, fine particles, easy to disperse in rubber compound, tensile strength, tear strength and modulus of vulcanizate. Higher, less deformation, low heat generation, good elasticity and resistance to flexing. Mainly used for tire curtain tape, inner tube, bicycle, hose, tape, cable, shoes and rolled products, model products.