Low molecular liquid rubber preparation device

Abstract

The invention discloses a low molecular liquid rubber preparation device. The low molecular liquid rubber preparation device comprises a solid-state rubber crushing section, a rubber heating softeningsection, a rubber high-temperature degrading section and a liquid-state rubber cooling section; the solid-state rubber crushing section can crush rubber as small particles; a heating cavity is formedin the side surface of a spiral cylinder of the rubber heating softening section; the rubber is heated and softened in the heating cavity under the effect of an extrusion screw rod; a small-outer-diameter extrusion section is arranged at an outlet end of the rubber heating softening section, so that softened rubber ultralong molecular chains are ruptured to become viscous pasty rubber; the rubberhigh-temperature degrading section comprises a degrading screw rod; a variable shaft diameter extrusion section is arranged at an inlet end of the degrading screw rod; a degrading shaft section is arranged at the middle part of the degrading screw rod; the viscous pasty rubber is extruded on the degrading shaft section to heat to the degrading temperature and to degrade as low molecular liquid rubber; and the liquid-state rubber cooling section is provided with a nitrogen protecting system. All process steps for producing the low molecular liquid rubber are realized by using the extrusion screw rod; and the low molecular liquid rubber preparation device is suitable for continuous industrial production.

Description

technical field [0001] The invention belongs to the field of production and preparation of low-molecular liquid rubber. Background technique [0002] Low molecular liquid natural rubber is a new type of natural rubber, which can be used in processing aids, reactive plasticizers, adhesives and other fields. So far, the methods for producing low-molecular liquid natural rubber include oxidation-reduction method, photocatalytic method, high-temperature degradation method, ozonolysis method, and microbial degradation method, all of which have shortcomings. [0003] Redox method: This method utilizes organic base catalysts such as phenylhydrazine, pyridine, etc. to degrade natural rubber latex, and the degradation effect is very good. However, phenylhydrazine is highly toxic and harmful to the environment; and because it can only degrade latex, the applicable raw materials are relatively simple, and it is the most commonly used method for preparing low-molecular liquid rubber in...

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problems of long reaction time, high energy consumption, high cost, environmental pollution, poor output performance, low output rate, and non-continuous production in the existing low-molecular liquid natural rubber production process, the present invention proposes a Low-molecular liquid rubber preparation device, according to the technological process, it sequentially includes a solid rubber crushing section 1, a rubber heating and softening section 2, a rubber high-temperature degradation section 3, and a liquid rubber cooling section 4, and the solid rubber crushing section 1 and the rubber heating and softening section 2 Share one extruding screw 11, the solid rubber crushing section 1 can crush large blocks or flakes of rubber into small particles, and the side of the spiral barrel of the rubber heating and softening section 2 is provided with an outwardly bulging heating chamber 21, small Granular rubber is temporarily stored, accumulated, extruded and softened by heating in the heating chamber 21 under the action of the extrusion screw 11. The outlet end of the rubber heating and softening section 2 is provided with a small outer diameter extrusion section 22, which can make the softened rubber The rubber ultra-long molecular chain breaks and becomes viscous paste rubber. The rubber high-temperature degradation section 3 includes a degradation screw 31. The inlet end of the degradation screw 31 is provided with a variable shaft diameter extrusion section 32, and the variable shaft diameter extrusion section 32 to make the viscous paste rubber temperature continue to rise, the middle part of the degradation screw 31 is provided with a degradation shaft section 33, and the surface of the degradation shaft section 33 is provided with forward and reverse spiral grooves, and the gap between the degradation shaft section 33 and the spiral barrel is very large Small, viscous paste rubber is extruded at the degradation shaft section 33 and heated to the degradation temperature and degraded into low-molecular liquid rubber. The outlet end of the degradation screw 31 is provided with a pressure-stabilizing section 34 with a smaller diameter, and the pressure-stabilizing section 34 The front end is provided with a pressure regulating valve 35, and the liquid rubber cooling section 4 is provided with a water cooling system 41 and a nitrogen protection system 42

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