Nano carbon black with in-situ grafted organic compound and its producing method

Abstract

The present invention relates to a kind of nano carbon black with in-situ grafted organic compound and its preparation process. Under the action of mechanical shearing force field, carbon black and organic compound possessing or capable of producing active free radical are made to produce direct grafting reaction at the temperature over the smelting point forming the grafted carbon black. The obtained grafted carbon black has high dispersivity and compatibility, as well as nano effect common modified carbon black does not have. In addition, the said carbon black modifying process needs no solvent, has no pollution, simple procedure and low cost, and is suitable for continuous production.

Description

technical field [0001] The present invention relates to a kind of surface-modified carbon black used in fields such as rubber industry, plastics industry, printing ink, paint, dry battery and its preparation method, specifically, to a kind of nano-carbon black and a kind of in-situ grafted organic compound its preparation method. technical background [0002] Carbon black is widely used in many industries such as rubber, plastics, etc. due to its reinforcement, function-giving, improved processability and additive effect. There are few occasions where powdery or granular carbon black is used alone, and most of them are used by uniformly dispersing carbon black in solid substances (such as raw rubber, polymers such as plastics and fibers) or liquid substances (water or solvents, etc.) . However, due to the large specific surface area of ​​carbon black particles, it is very easy to agglomerate, and it is difficult to achieve its uniform dispersion in polymer matrix or organi...

AI Technical Summary

Problems solved by technology

However, the grafting reaction on the surface of these carbon blacks has some fatal defects.

First of all, the above three known carbon black surface graft modification reactions are all carried out in a solution system, which is not conducive to large-scale production, high cost, and easy to pollute the environment

Secondly, whether it is the direct grafting of polymer chains on the carbon black surface or the polymerization from the carbon black surface after monomer grafting, the structure of the modified layer on the carbon black surface is not easy to control.

When using polymer grafting modification, because the polymer has low reactivity and great steric hindrance, the grafting rate is low; and the grafting monomer is re-initiated, although the grafting rate is high, but the synthesis process More cumbersome, and the molecular weight of the grafted polymer is also difficult to control

The reaction between carbon black and macromolecules in method (3) can connect macromolecules with a specified structure, and it is easy to control the molecular weight and chain number of macromolecules grafted on the surface of carbon black. However, the types of macromolecules that can react with carbon black Limited (polymers with hydroxyl groups, amino epoxy groups and polymers), and only suitable for channel blacks with more oxygen-containing functional groups on the surface, for furnace blacks with fewer oxygen-containing functional groups on the surface (the leading species of carbon black, accounting for about %) is difficult to obtain satisfactory results

Third, the polymer grafting modification is carried out in the solution system, although ultrasonic dispersion treatment has also been done, but all failed to destroy its agglomeration structure (such as figure 1 , 2 shown), no monodisperse primary particles can be obtained

[0010] In summary, it is extremely difficult to prepare monodisperse nano-carbon black that can be uniformly dispersed in a polymer matrix or in water or organic solvents using existing technologies.

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