TH30133B - Improved inverse carbon black and methods for its production. - Google Patents

Abstract

DC60 (02/06/53) Inverse carbon black and methods for its production have been revealed. Inverse carbon black exhibits lower rolling resistance with similar or improved wet sliding behavior. The particle size distribution contains a smaller proportion of larger diameter particles. This leads to improved abrasion behavior in the rubber compound layers prepared using these carbon blacks. Inverse carbon black can be produced in conventional carbon black reactors with controlled combustion in the combustion chamber in such a way that the carbon black nuclei are formed and immediately introduced into contact with the carbon black raw material. The carbon black will exhibit a lower proportion of larger particles if the addition of combustion air and carbon black raw material is appropriately increased. Inverse carbon black and methods for its production have been revealed. Inverse carbon black exhibits lower rolling resistance with similar or improved wet sliding behavior. The particle size distribution contains a smaller proportion of larger diameter particles. This leads to improved abrasion behavior in the rubber compound layers prepared using these carbon blacks. Inverse carbon black can be produced in commonly used carbon black reactors with controlled combustion in the combustion chamber in such a way that the carbon black nuclei are arranged to be immediately introduced into contact with the carbon black feedstock. The carbon black will exhibit a lower proportion of larger particles if the addition of combustion air and carbon black feedstock is done in an appropriate manner.

Claims (4)

1. Carbon black from the kiln with a CTAB value of 20-190 m²/g and an absorption of 24 M4-DBT of 40-140 mm/100g, with a ratio (formula) such that when used in combination with an SSBR/BR rubber compound that conforms to the relationship (formula), the value of (formula) is lower than that for ASTM carbon black with the same CTN surface area and 24 M4-DBT absorption, where the particle size distribution curve has an absolute slope of less than 400,000 nm3, where the absolute slope (AS) is determined by the following formula from the measured particle size distribution of the carbon black mass: (formula), where Hi represents the frequency at which particle diameter Xi occurs, x- is the particle diameter of the mass corresponding to the weight of the average particle weight of the carbon black mass. The sum will be in the range of 1 nanometer to 3000 nanometers in spaces with equal spacing for each meter. 2. The method for the production of carbon black from a blast furnace conforming to claim 1 in a packed (axial) carbon black reactor with a combustion zone, reaction zone, and termination zone, comprising: the generation of hot waste gases in the combustion zone by combustion of primary carbon black feedstock in oxygen-containing gas; the feeding of these hot waste gases from the combustion zone through the reaction zone into the termination zone; the incorporation of secondary carbon black feedstock into the hot gases in the reaction zone; the shaping of the carbon black to be completed in the termination zone by atomization with water, where oil, an oil/natural gas mixture, or natural gas alone are used as primary carbon black feedstock; and the combustion of the primary carbon black feedstock to be nucleated, with immediate contact of these nuclei with the secondary carbon black feedstock; the addition of combustion air to the primary and secondary carbon black feedstocks in such a way that the resulting absolute slope of the particle size distribution curve of the shaped carbon black is less than 400,000 nm.3 3. The carbon black from the kiln was produced using the method described in Claim 2. 4. Rubber packed with carbon black from a furnace that conforms to claim 1.