(3) Surface modification of carbon black
The carboxyl group and the hydroxyl group on the surface of the carbon black are reacted with a low molecular compound to form an active point,
Further, graft polymerization is initiated to obtain a modified product having a high graft ratio. The carbon black particles are prevented from re-aggregating under the effect of their steric hindrance.
(4) Condensation grafting of carbon black surface with rubber macromolecular end groups
The sulfhydryl group and the light base on the surface of the carbon black are converted into highly reactive functional groups by reacting with a highly active substance, and then reacted with a hydroxyl group-containing polymer such as polyester to form a graft polymer chain on the surface of the carbon black to strengthen the direct The firmness of the connection.
(5) Grafting of free radicals on the surface of carbon black
The aromatic fused ring and the quinoid structure on the surface of the carbon black have a trapping function on the free radicals, and can generate a radical-bearing polymer substance, which easily reacts with the surface of the carbon black to form a graft with the surface of the carbon black. A typical example is the modification of carbon black with long-chain unsaturated fatty acids in the presence of dicumyl peroxide (DCP) to achieve a flexible bond between the rubber and the carbon black to make the rubber gasket The flexing resistance and fatigue resistance are greatly improved.
(6) Surface modification of carbon black
Carbon black undergoes surface oxidation treatment, and the type and amount of surface functional groups change. The activity and polarity of the surface are improved, thereby reducing the tendency of agglomeration and greatly improving its dispersibility in the rubber matrix.
(7) Halogenation modification of carbon black surface
The functional groups on the surface of the carbon black can all produce a halogenation reaction. If a more electronegative chlorine atom is introduced into the surface of the carbon black, the type and amount of these functional groups can be changed, and the surface activity of the carbon black can be increased, thereby greatly increasing the dispersion of the modified carbon black in the rubber matrix. .
In summary, the surface functional group of carbon black determines the surface activity of carbon black, which satisfies the high performance and practical value of the rubber gasket.
Type of modified carbon black Ⅱ
2019年4月21日
Rubber Molds FAQs
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(3) Surface modification of carbon black
The carboxyl group and the hydroxyl group on the surface of the carbon black are reacted with a low molecular compound to form an active point,
Further, graft polymerization is initiated to obtain a modified product having a high graft ratio. The carbon black particles are prevented from re-aggregating under the effect of their steric hindrance.
(4) Condensation grafting of carbon black surface with rubber macromolecular end groups
The sulfhydryl group and the light base on the surface of the carbon black are converted into highly reactive functional groups by reacting with a highly active substance, and then reacted with a hydroxyl group-containing polymer such as polyester to form a graft polymer chain on the surface of the carbon black to strengthen the direct The firmness of the connection.
(5) Grafting of free radicals on the surface of carbon black
The aromatic fused ring and the quinoid structure on the surface of the carbon black have a trapping function on the free radicals, and can generate a radical-bearing polymer substance, which easily reacts with the surface of the carbon black to form a graft with the surface of the carbon black. A typical example is the modification of carbon black with long-chain unsaturated fatty acids in the presence of dicumyl peroxide (DCP) to achieve a flexible bond between the rubber and the carbon black to make the rubber gasket The flexing resistance and fatigue resistance are greatly improved.
(6) Surface modification of carbon black
Carbon black undergoes surface oxidation treatment, and the type and amount of surface functional groups change. The activity and polarity of the surface are improved, thereby reducing the tendency of agglomeration and greatly improving its dispersibility in the rubber matrix.
(7) Halogenation modification of carbon black surface
The functional groups on the surface of the carbon black can all produce a halogenation reaction. If a more electronegative chlorine atom is introduced into the surface of the carbon black, the type and amount of these functional groups can be changed, and the surface activity of the carbon black can be increased, thereby greatly increasing the dispersion of the modified carbon black in the rubber matrix. .
In summary, the surface functional group of carbon black determines the surface activity of carbon black, which satisfies the high performance and practical value of the rubber gasket.