| 摘要 |
PURPOSE: Provided are fine-particle rubber powder comprising rubber containing carbon black powder and existing in organic solvent and a method for producing the same and a use thereof. CONSTITUTION: The fine particle rubber powder is produced by preparing the rubber in an organic solvent solution by solution polymerization: (a) firstly suspending a carbon black in an appropriate amount as a filler for the rubber in water by means of a high-shear mixing device, without any other additives, and setting the solids content of the suspension to 0.5-15%; (b) separating some of the suspended carbon black from the main amount of carbon black, the amount of carbon black separated (in suspension) in this step ranging from 0.5-20%, based on the total amount of carbon black in the finished product; (c) finally heating the suspension which comprises most of the carbon black to a temperature approximately equal to the boiling point of the organic solvent in which the polymer has been dissolved; (d) introducing the rubber solution into the carbon black suspension, with stirring, and simultaneously removing solvent by distillation at atmospheric pressure or in vacuo, and removing the organic phase by distillation in water to transfer the rubber into the aqueous carbon black suspension and form the rubber/filler composite, followed by removal of the solvent; (e) mixing the aqueous suspension comprising the product with the carbon black suspension retained in (b), with stirring; (f) treating the suspension of (d) and (e) with 1-15 parts of a rubber emulsion, based on a total of 100 parts of rubber; (g) adjusting the pH of the suspension of (f) with a Bronsted or Lewis acid to 2-7.
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