A kind of liquid phase preparation method of regenerated rubber

Abstract

A liquid-phase preparation method of regenerated rubber provided in the present invention includes the steps of activation system preparation, rubber powder pretreatment, and liquid-phase step-by-step regeneration; the regenerated rubber produced by this technology has low crosslinking density and high cleanliness characteristics, no need to add compounding agent, the product itself has a low Mooney viscosity and excellent mechanical properties; it solves the uneven regeneration degree of reclaimed rubber produced in the prior art, the colloid contains a large amount of rubber compounding agent, and the reaction process needs The addition of inseparable swelling agents and regenerants affects the later use performance, long-term parking Mooney viscosity increases and many other problems; it fundamentally solves the problems of uneven rubber regeneration, macromolecular chains are easy to oxidize and degrade during the regeneration process, and the unregenerated parts cannot be separated. The problem of performance can greatly improve the performance of the product and the production conditions are mild; it can greatly improve the application range of recycled rubber.

Description

technical field [0001] The invention relates to the technical field of rubber material preparation, in particular to a liquid-phase preparation method of regenerated rubber. Background technique [0002] The regeneration of waste rubber refers to the use of physical, chemical or other methods to open the S-S bonds and S-C bonds in the cross-linked network to regain processability, and strive to reduce the main chain breaks to realize the reuse of rubber. The existing waste rubber recycling technologies are classified into physical methods, chemical methods and biological methods. The waste rubber regeneration methods commonly used in the prior art include high-temperature dynamic desulfurization method, atmospheric pressure high-temperature continuous method, microwave method and many other methods. The above regeneration methods are, without exception, the regeneration of waste rubber under high temperature, pressure and solid phase conditions. [0003] This type of react...

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Problems solved by technology

[0003] This type of reaction generally has the problem of limiting product performance; first, the reaction is carried out under high temperature and high pressure or high temperature, medium and low pressure conditions. When the cross-linking bonds of waste rubber are destroyed, the rubber macromolecular main chain is also broken and broken. Oxidative degradation; secondly, under solid state reaction conditions, the penetration of regenerants in waste rubber is limited, and the regenerated waste rubber generally has a high degree of surface regeneration or even oxidative degradation without regeneration inside, and the produced reclaimed rubber has The regenerated soft segment and the incompletely regenerated cross-linked hard segment are not conducive to the improvement of rubber performance; again, in order to improve the permeability of the regenerant and reduce the Mooney viscosity of the regenerated rubber, usually in the regeneration process of waste rubber Add softeners, common softeners include aromatic oils, naphthenic oils and other polluting additives or natural oils or natural additives extracted from fruit husks, no matter whether they are polluting or not, these additives will last for a long time after rubber regeneration The remaining in the rubber, although it will make the rubber have a lower Mooney viscosity and better tensile properties within a certain period of time; but after a long period of storage, such additives will gradually permeate from the regenerated rubber , or an oxidative hinge reaction occurs, which greatly increases the hardness and Mooney viscosity of the rubber, which is not conducive to the storage of regenerated rubber; The rubber cross-linking bond is destroyed, and the induced molecular chain activity increases

Finally, regenerated rubber is mostly used to replace other rubbers for blending. The oils that already exist in reclaimed rubber also affect the performance of other rubbers when used together with other rubbers such as natural rubber or other synthetic rubbers. At the same time, softeners The instability of the added amount leads to the need to adjust the additive formula of the rubber used at any time, which is not conducive to the continuous production

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