Whether it is latex reclaimed rubber or tire reclaimed rubber, EPDM reclaimed rubber, nitrile reclaimed rubber or butyl reclaimed rubber, there is a problem that the Mooney viscosity increases during parking. This problem has plagued the reclaimed rubber factory and its use Reclaimed rubber production rubber products rubber products processing enterprises. Well, in the face of this thorny problem, how to solve it? We use latex reclaimed rubber as an example to analyze the reason why the viscosity of Mooney increases during the storage of reclaimed rubber.
Latex reclaimed rubber is a kind of reclaimed rubber made from used latex products as raw materials through crushing, desulphurization, disinfection, drying, filtration and other processes. It is mostly used to replace natural rubber to produce rubber products to reduce costs. Latex reclaimed rubber during the Mooney viscosity increase occurs during the main reasons are the following:
1, Reclaimed rubber will cut off CS or SS bond during regeneration process. After cutting, CS or SS bond will generate active free radicals. Due to molecular movement during storage, they will be cross-linked again and again to form a three-dimensional network structure with gradually increasing molecular weight Increase, so Mooney viscosity gradually increased again to generate elastomer;
2. Moisture and low-boiling volatiles in the poultice agent added to the reclaimed rubber gradually volatilized during storage, leading to the increase of the Mooney viscosity of the reclaimed rubber with the increase of the parking time.
3, the lower the Mooney viscosity of waste tire powder after regeneration, the powder contains a large number of reinforcing particles such as carbon black, white carbon black, these particles in the rubber matrix due to molecular heat movement and aggregation to form a filler network, in the regeneration process The packing network is constantly being broken and rebuilt, and its dispersion state has changed. During the parking process, the packing material remelted through the molecular thermal motion to form a filler network, resulting in an increase of the Mooney viscosity. (For tire reclaimed rubber)
For the above analysis of the reasons, we can solve the problem of reclaimed rubber Mooney viscosity increased during parking:
1, adding the right amount of free radical scavenger, such as phenols, alcohols, carboxyls, amines and other compounds with active hydrogen termination of free radicals in order to control the Mooney rebound;
Addition of DCP peroxide inhibits the increase of Mooney viscosity during the reclaimed rubber deposition. The principle of this method is that under the action of heat or mechanical action, free radicals are formed to terminate the formation of free radicals by breaking the CS or SS bonds of the vulcanizates, Thus controlling the regeneration rubber Mooney viscosity increase;
3, adding antioxidant 4010, 4010NA, RD or H activated powder, vulcanized rubber according to SBR rubber compound formula compared with non-activated rubber powder, the compression fatigue temperature decreased, the tensile strength also increased to some extent, and with Antioxidant RD activated rubber powder tread rubber significantly reduced wear; (for tire reclaimed rubber, butyl reclaimed rubber)
4, adding antioxidants such as antioxidants 246 and antioxidants such as phenols and polyphenols, clear γ-irradiation of polymer crosslinking and oxidation of free radicals, to prevent the recombination of free radicals, limiting oxidation damage to the rubber backbone, The plastic material from elastic to plastic, and maintain good physical and mechanical properties.
Hebei Hongyun reclaimed rubber factory reclaimed rubber parking workshop clean and tidy environment, dry and ventilated, you can well store reclaimed rubber products, rubber products companies can rest assured that use.
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