The structure is one of the basic properties of carbon black, and the other two properties are particle size and surface properties. It refers to the aggregation state and degree of carbon black elementary particles, and is also a general term for primary structure and secondary structure. Most of the carbon black varieties have a particle size within the nanometer size range (<100 nm), and their surfaces are rich in active groups. Therefore, there is inevitably more or less tendency of aggregation between particles, which is the origin of the structural concept.
The carbon black manufacturing process is always under high temperature conditions, and adjacent particles are simultaneously formed, mutually melted into a chain, and occupy a space of three degrees, which is called a primary structure. In the post-processing stage, a relatively loose structure is formed between the structures due to physical adsorption or van der Waals force or static electricity, which is called a secondary structure.
The fastness of the primary structure is strong and it is not easy to be damaged in the processing of the rubber stopper. This property has a great influence on the vulcanized rubber.
Relatively speaking, the secondary structure is susceptible to damage by mechanical forces during processing, so it is also called a temporary structure.
The influence of the carbon black structure on the performance of the rubber plugs can be divided into two aspects: Firstly, in terms of the physical properties of the vulcanizate, the high carbon black has a good effect on hardness, tensile stress and electrical conductivity. Secondly, the structure also plays a key role in the rubber processing performance. The higher the structure, the more difficult it is to disperse in the rubber and the greater the heat generation.
The height of the carbon black structure can be measured by the oil absorption value, which is the adsorption volume (mL/g) of the oil per unit mass (usually dibutyl phthalate, DBP) per unit mass. According to the level of the oil absorption, the structure of the carbon black can be determined.
In order to obtain the carbon black of the desired structure, it can be regulated in the carbon black manufacturing process. To improve the structure, a feedstock oil with a high aromatic content can be used; to reduce the structure, a metal salt can be added to the feedstock oil and a smaller burner spray angle can be used.
Carbon black structure
2019年4月13日
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The structure is one of the basic properties of carbon black, and the other two properties are particle size and surface properties. It refers to the aggregation state and degree of carbon black elementary particles, and is also a general term for primary structure and secondary structure. Most of the carbon black varieties have a particle size within the nanometer size range (<100 nm), and their surfaces are rich in active groups. Therefore, there is inevitably more or less tendency of aggregation between particles, which is the origin of the structural concept.
The carbon black manufacturing process is always under high temperature conditions, and adjacent particles are simultaneously formed, mutually melted into a chain, and occupy a space of three degrees, which is called a primary structure. In the post-processing stage, a relatively loose structure is formed between the structures due to physical adsorption or van der Waals force or static electricity, which is called a secondary structure.
The fastness of the primary structure is strong and it is not easy to be damaged in the processing of the rubber stopper. This property has a great influence on the vulcanized rubber.
Relatively speaking, the secondary structure is susceptible to damage by mechanical forces during processing, so it is also called a temporary structure.
The influence of the carbon black structure on the performance of the rubber plugs can be divided into two aspects: Firstly, in terms of the physical properties of the vulcanizate, the high carbon black has a good effect on hardness, tensile stress and electrical conductivity. Secondly, the structure also plays a key role in the rubber processing performance. The higher the structure, the more difficult it is to disperse in the rubber and the greater the heat generation.
The height of the carbon black structure can be measured by the oil absorption value, which is the adsorption volume (mL/g) of the oil per unit mass (usually dibutyl phthalate, DBP) per unit mass. According to the level of the oil absorption, the structure of the carbon black can be determined.
In order to obtain the carbon black of the desired structure, it can be regulated in the carbon black manufacturing process. To improve the structure, a feedstock oil with a high aromatic content can be used; to reduce the structure, a metal salt can be added to the feedstock oil and a smaller burner spray angle can be used.