Nitrile reclaimed rubber has excellent oil resistance and can be used in oil media for a long time in the production of oil-resistant rubber shoes. It is a way for many oil-resistant rubber shoe manufacturers to reduce raw material costs. However, recently our customer service personnel received customer calls: the use of nitrile rubber reclaimed rubber production of oil-resistant shoes, shoe soles appear scorching problems, the sole surface uneven size of the pits, is not reclaimed rubber problems. Although the customer is asking a question, we also know that his implication is that the quality of the nitrile reclaimed rubber product causes the scorch of the rubber compound.
In this regard, our technical staff provided detailed answers for the customer and provided various measures to solve the scorch problem. Xiaobian shared with you:
The scorching refers to the early vulcanization that occurs during the rubber processing. In actual production, there are many reasons that cause scorch problems in the shoe sole of the nitrile rubber reclaimed rubber production. For example, the accelerator is not appropriate, the amount is too large, and the mixture is mixed. If the temperature is too high, the temperature of the rubber material is too high, and the parking time is too short, the scorching may be caused.
The design of vulcanization system of rubber shoes is unreasonable. The improper selection of accelerators and the excessive use of accelerators are the main causes of scorching. In order to reduce the frequency of scorch, rubber manufacturers in the design of nitrile rubber reclaimed rubber shoes vulcanization system, it is best to use the accelerator with a higher delay or critical temperature, or a combination of a variety of accelerator curing system. In order not to increase the vulcanization efficiency, it is not necessary to increase the amount of accelerator.
In the sole production process of nitrile regenerated rubber soles, the heating temperature is too high, exceeds the critical point of scorch, or the cooling and cooling time is too short can lead to the fatigue recovery of nitrile rubber reclaimed rubber compound can not be fully relieved, causing scorching, must strictly control the heating temperature After the rubber has cooled sufficiently, it enters the next process, but the parking time cannot be too long.
The use of nitrile rubber reclaimed rubber to produce oil-resistant shoes soles need to add a variety of chemical additives, if some of the additives in the rubber dispersion is not uniform, it will lead to local scorch soles, there are pits.
The role of the anti-scorching agent is to prevent scorch of the rubber material, improve the safety of operation, and prolong the storage period of the rubber material and the glue. In the production process of nitrile rubber reclaimed rubber shoes, in addition to reducing the process temperature and speed as much as possible within the allowable range of the process conditions, an appropriate amount of anti-scorching agent can be added to the cost, and the frequency of scorch phenomenon can be significantly reduced.
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