Reclaimed rubber activator plays a catalytic role in the production of reclaimed rubber. Its catalytic principle is that when the crosslinking agent of the reclaimed rubber material is broken, it can combine with the free radicals produced by the cracking of the vulcanizate to prevent the broken rubber molecular chain Combined, shorten the regeneration time. There are many types of reclaimed rubber activators, different activators have different effects.
Reclaimed rubber activators are mainly thiophenols, aromatic disulfides, polyalkyl phenol disulfides, naphthols, phenols sulfoxides, aniline sulfides, amines, stearic acids, complex and then Life and other agents. One disulfide type reclaimed rubber activator is the most widely used in our country. Such as diphenyl disulfide (DPDS) commonly used in natural rubber vulcanized rubber and waste tire rubber powder, can reduce the regeneration temperature (170 ~ 190); diallyl disulfide (DADS) can reduce the crosslinking density of reclaimed rubber; activator 420,450,480 is the largest amount of regenerative activator in the industrialized production of reclaimed rubber at home. Can improve the tensile strength of reclaimed rubber, elongation at break, reduce the Mooney viscosity of reclaimed rubber and improve the operability.
The activity of the thio-phenol reclaimed rubber activator is high, but the quality is unstable and the toxicity is high. The activity of the thionol zinc salts is low and the preparation process is complicated. The aromatic disulfide activity is high, the preparation process is simple, and the toxicity is relatively small. Polyalkylphenol disulfides and phenol sulfoxides have higher activity, but the preparation process is complex, and the price is higher.
Amine reclaimed rubber activator can not only make the cross-linking bond break, but also act as activator for the vulcanizing agent. When the formation and breaking of the cross-linking bond reach equilibrium, the reclaiming rubber regeneration process is over. Commonly used amines regeneration activator mainly hexadecylamine, hexamethylenetetramine, tetraethylenepentamine and superplasticizer and so on. Generally, the reclaimed rubber with the amine regenerant activator has good comprehensive performance, among which: hexadecylamine (HAD) is usually used as a regenerative activator of the ethylene propylene diene sulfide rubber; hexamethylenetetramine Ethylpentylamine commonly used in tire rubber tire, the amount of 0.5% recycled rubber products the best performance, excessive dosage will promote cross-linking of rubber powder, thereby increasing the reclaimed rubber Mooney viscosity; Thiourea - ethanolamine is usually used at room temperature machinery Chemical regeneration method, in the open mill shear force for the regeneration of vulcanized natural rubber.
Common polysulfide regenerant activators are TMTD, DM, MBTS, among them: TMTD, MBTS are usually used in the regeneration of tire rubber powder to improve the content of recycled rubber sol, reduce the cross-linking density of reclaimed rubber and improve the processing of recycled rubber Performance, improve the overall performance of recycled rubber.
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