Using nitrile rubber and nitrile reclaimed rubber together to produce oil-resistant and wear-resistant rubber products can not only ensure product quality, but also reduce raw material costs. When using an open mill for plasticizing and mixing raw rubber, the mixing effect of nitrile rubber/reclaimed rubber and rubber directly affects the overall performance of the rubber product; then in actual production, nitrile rubber and nitrile reclaimed rubber are mixed with an open mill How to mix rubber better, and what issues should be paid attention to?
1. Plasticizing of nitrile raw rubber
The fluidity and plasticity of nitrile reclaimed rubber are obviously better than that of nitrile rubber. Usually, the raw nitrile rubber is fully plasticized and then mixed with nitrile reclaimed rubber. In actual production, nitrile rubber mostly chooses the two-stage mastication method for mastication. In the process of plasticizing nitrile rubber, generally control the roll temperature of the mill at 40-50℃, adjust the roll distance to about 0.5mm, and park after 15-20 passes; park for more than 10 hours and then follow the above method Carry out two-stage mastication; usually, the plasticity of the nitrile raw rubber mastication is controlled at about 0.4.
2. Mixing of nitrile rubber and nitrile reclaimed rubber
(1) Nitrile raw rubber/reclaimed rubber is evenly dispersed: After the nitrile rubber is fully plasticized, the nitrile plasticized rubber 2LLYY917 can be mixed with the nitrile reclaimed rubber according to the formula ratio. At this time, the roller temperature of the mill is generally controlled at 45℃, adjust the roller distance to 1mm, and hit the triangle bag until it is evenly dispersed. The number of times of the triangle bag is about 5-6.
(2) Raw rubber/reclaimed rubber mixing: After the nitrile rubber and nitrile reclaimed rubber are fully and evenly dispersed, adjust the roller pitch of the mill to about 4mm to wrap the rollers. At this time, there should be an appropriate amount of accumulated rubber in the gap of the roller. , And then mark the remaining glue, add the compounding ingredients in the order of addition, after the powder is eaten, perform the triangulation operation, thin and unload, and wait for subsequent processing.
(3) Timing of compounding agent addition: Generally, the compounding agent that is not easy to disperse and the compounding agent with a large amount are added first; activators such as zinc oxide and stearic acid are added first, and antioxidants and supplements are added after the rubber becomes soft. Strong agent, rubber filler and rubber oil; in order to improve the dispersion of carbon black in the nitrile rubber compound, it is recommended to add rubber oil after carbon black, and finally add sulfur and accelerator; because nitrile rubber is a polar rubber, sulfur It is difficult to disperse in rubber, so sulfur can be added in advance.
Use nitrile rubber and nitrile reclaimed rubber together to produce oil-resistant and wear-resistant rubber products. When choosing an open mill for rubber mixing, the mixing degree of the combined rubber directly affects the performance and service life of the oil-resistant products. Rubber product manufacturers must Proceeding from reality, appropriately adjust the rubber mixing process and the timing of compounding to provide a better foundation for the subsequent production process.
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