A kind of carbon black-filled natural rubber masterbatch and its preparation method and application

Abstract

The invention belongs to the technical field of preparation of carbon black natural rubber master batches, and particularly discloses a carbon black filled natural rubber master batch, and a preparation method and application thereof. The preparation method comprises the following steps: firstly, mixing and flocculating carbon black slurry and latex to obtain a condensate, and then dehydrating anddrying the condensate. A centrifugal dehydration and extrusion dehydration expansion drying integrated post-treatment technology is adopted, so compared with the conventional forced air drying, the preparation method has the following advantages: the drying time is greatly shortened, the shearing force in the extrusion dehydration process is relatively strong, the probability of re-aggregation ofthe carbon black in a wet flocculation product is reduced, the interaction between the carbon black and a rubber matrix is facilitated, and the higher content of the combined rubber is obtained, so that the carbon black master batch product with good carbon black dispersion and rubber / carbon black interaction is favorably obtained; and no surfactant is added, so that the defects that the surfaceactivity of carbon black is reduced, the content of binding rubber is reduced, the mechanical property of vulcanized rubber becomes poor and the like due to the addition of the surfactant are overcome.

Description

technical field [0001] The invention belongs to the technical field of preparation of natural rubber masterbatch, in particular to a kind of carbon black-filled natural rubber masterbatch and its preparation method and application. Background technique [0002] The technology of preparing rubber / carbon black compound (also known as: masterbatch) by wet method refers to a technical method for preparing rubber masterbatch containing carbon black based on latex / carbon black slurry mixing technology. Compared with dry rubber Due to the high viscosity of rubber and the extremely low viscosity of latex, carbon black is mixed with low-viscosity latex, followed by flocculation and drying to prepare carbon black-containing masterbatch, which is conducive to reducing the energy consumption of carbon black in rubber dispersion and improving carbon black in rubber. Therefore, it has been valued by the industry in recent years. [0003] At present, the disclosed technical route for prep...

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Problems solved by technology

[0006] For example, patent 02152077.1 proposes a preparation method of carbon black-filled powder rubber: carbon black is dispersed in water in the presence of an emulsifier (nonionic surfactant or anionic surfactant) to prepare carbon black slurry , and then mix it with latex, heat, flocculate, and dry to prepare a carbon black-filled powder rubber with a particle size of 0.2 to 1.0 mm; in this method, since a certain amount of surfactant is added as a carbon black dispersant , the surfactant remaining in the rubber may reduce the modulus and strength of the rubber, and the surfactant washed out may also cause waste water treatment costs

Patent publication 201410337186.X provides a method for preparing carbon black-filled styrene-butadiene rubber masterbatch that is suitable for non-contact pollution without adding surfactants. In the preparation stage of carbon black slurry, no addition is used to improve the dispersion of carbon black However, the patent does not state the prepared flocculation product (ie: containing carbon black / wet rubber mixture) Post-processing method

Patent Publication 201210266789.6 proposes a wet milling method for preparing natural rubber-carbon black rubber, in which a variety of water-soluble alcohols or ethers are added to the carbon black dispersion preparation stage, which increases to a certain extent It reduces the treatment cost of its wastewater, and has certain pollution to the environment

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