Nitrile rubber has excellent oil resistance, chemical corrosion resistance, heat resistance and aging resistance, and is widely used in manufacturing various industrial rubber rolls. Recycled nitrile rubber is processed from waste nitrile rubber and waste nitrile rubber products such as nitrile gloves. It retains the basic performance characteristics of nitrile rubber and has a large oil resistance coefficient. It can replace the appropriate proportion of nitrile rubber to produce rubber rolls, effectively reducing the raw material cost and production energy consumption of rubber rolls.
1. Main application fields of nitrile rubber in rubber roller
In actual production, nitrile rubber can be used alone or in combination with nitrile rubber to produce rubber roller products used in papermaking, printing, textile, printing and dyeing, tanning, steel and other fields. High hardness cots, low hardness cots, paper making cots, textile cots and ironmaking industrial cots can be appropriately mixed with nitrile rubber, and meet the special requirements of different cots' working environment and physical and mechanical strength requirements through reasonable formula design.
2. Key points of rubber roller formula design mixed with nitrile rubber
When using nitrile rubber or nitrile rubber/reclaimed rubber to produce rubber roller, it is necessary to fully consider the load that the roller system needs to bear during the working process, the roller surface speed, wear resistance, oil resistance, pollution resistance, and chemical resistance requirements of the rubber roller, and reasonably select the vulcanization system, reinforcement filling system, softening and plasticizing system, etc.
When producing rubber rolls from nitrile rubber and nitrile rubber/reclaimed rubber, the sulfur - accelerator system is preferred. The sulfur can be used together with accelerator DM, accelerator TS, etc. When the rubber rolls require high heat resistance, it is recommended to use accelerator TT with sulfur. The use of fine-particle furnace black, easy-mixed tank black, semi-reinforced carbon black for reinforcement, and the filling of clay, black ointment, etc., can give the nitrile rubber 2SLYY28 rubber roller higher mechanical strength and better processing performance. The use of 5-10 phr of liquid nitrile or plasticizer in the formula of rubber roller containing nitrile reclaimed rubber is beneficial to improve the rubber calendering operation and increase viscosity.
3. Skills of producing high hardness rubber roll with nitrile rubber
In actual production, the paper industry and chemical industry departments mostly use high hardness rubber rolls that are resistant to oil and chemical corrosion. When producing high hardness rubber rolls with nitrile rubber, nitrile rubber reclaimed rubber, nitrile rubber/nitrile rubber reclaimed rubber, the rubber shrinkage during vulcanization and deep cracking in the transverse direction of the rubber roll are common problems. In this regard, it is recommended to increase the amount of filler appropriately to make the film smoother and more flexible. During vulcanization, shrinkage can be properly controlled to reduce the cracking of high-hardness nitrile rubber roll.
It is worth mentioning that compared with nitrile rubber, the regenerated nitrile rubber has good fluidity and high plasticity. When used together with the original rubber, it can act as a lubricant, and then improve the rubber calendering, extrusion speed, tablet and tablet pressing processes; The expansion and shrinkage of unvulcanized rubber mixed with recycled rubber during processing is much smaller than that of unvulcanized rubber with only new rubber. It is easy to process, and the shape and size of the finished product are accurate.
There are still many problems to be noticed when using nitrile rubber to replace a proper amount of nitrile rubber to produce rubber roll products. The following small editor will continue to discuss relevant issues with you.
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