Butyl reclaimed rubber is processed from waste butyl inner tube as raw material, retaining most structural characteristics of butyl rubber, resistance to air permeability, heat resistance, water resistance, ozone resistance, acid and alkali resistance, electrical insulation properties, etc. Excellent,replaceable butyl rubber or butyl rubber used in the production of rubber products can significantly reduce the cost of raw materials; but it is precisely because of its unique molecular structure characteristics, but also for the butyl rubber / reclaimed rubber processing process to bring an impact, vulcanization The slow speed, low adhesion, weak interaction with reinforcing agents, etc., among which the reinforcing effect of reinforcing agent in butyl regenerated rubber products can significantly improve the comprehensive index of butyl regenerated rubber products.
Carbon black is the most commonly used reinforcing agent in the rubber industry. Xiaobian used carbon black as an example to discuss how to improve the reinforcing effect of reinforcing agents on butyl rubber/recycled rubber products. In the actual production, the surface properties and structure of the reinforcing filler represented by carbon black have a great influence on the reinforcing properties of butyl rubber/reclaimed rubber. Generally, the surface of carbon black has high oxygen content, and the butyl rubber The regenerated rubber has a large reinforcing property, and a low oxygen content leads to a poor overall performance of the butyl rubber/recycled rubber vulcanizate. Therefore, when rubber products manufacturers select butyl rubber/reclaimed rubber to produce rubber products, certain measures need to be taken to heat-treat the butyl rubber through poly-p-nitrobenzene, etc. to replace the oxygen on the filler surface to complete the reinforcing and filling. The reinforcing bond between the agent and butyl rubber.
Carbon black can be classified in channel black, furnace black, thermal black, etc. according to the production method. The surface of channel black itself contains a large amount of oxygen, and butyl can be used in an open mill or an internal mixer. Rubber, butyl reclaimed rubber and channel black are made in carbon black masterbatch. Before carbonization, the carbon black masterbatch is recycled several times at a certain temperature to prevent the addition of a vulcanizing agent after cooling to increase the butyl content. Rubber / reclaimed rubber vulcanizate performance. Furnace carbon black and thermal black carbon black do not contain oxygen. It is necessary to add polyparadinitrobenzene, hydrazine GMF, and N-methyl-N,4-dinitrosoaniline chemical modifiers for heat treatment. The reinforcing effect of reinforcing carbon black in butyl rubber/reclaimed rubber is increased; the surface of clay and white carbon is free of oxygen, and the heat treatment method is the same as above.
Different kinds of reinforcing agents are used in heat treatment with different methods, which are mainly divided in static method and dynamic method. The static method uses conventional methods to mix butyl rubber/reclaimed rubber, adding reinforcing agent, filler, Preparation of heat treatment agent masterbatch directly after heating in steam or hot air for 2-4 hours; dynamic law requires the use of high temperature around 150 degrees Celsius in the internal mixer for butyl rubber / reclaimed rubber reinforcing agent, filler Heat treatment (completed in about 10 minutes, add butyl rubber/reclaimed rubber after setting initial temperature—add half of reinforcing agent, filler and all heat treatment agent—add remaining reinforcing agent, filler, zinc oxide, stearic acid And so on - row glue). N-methyl-N,4-dinitrosoaniline has good effect, high processing safety, generally used as heat treatment agent in carbon black masterbatch; butyl rubber/recycled rubber compound with clay as filler Then use poly-2-nitrosobenzene.
Compared with the ordinary butyl rubber/recycled rubber compound, the heat-treated butyl compound has better wear resistance, resilience and processing performance, and the extrusion and rolling are smoother. When rubber products manufacturers process rubber products using butyl rubber or reclaimed rubber as raw materials, the above measures can improve the reinforcing properties of reinforcing agents and fillers in butyl rubber/recycled rubber products, and improve the synthesis of butyl products. Performance and service life.
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