Rubber O-rings have the characteristics of simple structure, small size, light weight, simple process, easy disassembly, good sealing effect, and low friction resistance. The rubber is required to have good tensile strength, constant tensile strength, low compression set deform, and some products also require the rubber to have good oil resistance, wear resistance, heat resistance and aging properties; Nitrile rubber is an ideal raw material for the production of rubber O-rings; Nitrile recycled rubber retains the basic performance characteristics of nitrile rubber, with good oil resistance, wear resistance, water resistance, and good adhesion, which can replace nitrile rubber to produce rubber O-rings and reduce raw material costs.
1. The addition ratio of nitrile recycled rubber to rubber O-ring compound
When using nitrile rubber as the main raw material to produce rubber O-rings, using part of nitrile recycled rubber instead of raw rubber can effectively reduce the cost of raw materials under the premise of ensuring the performance of the finished product. The doping ratio of nitrile recycled rubber in rubber O-ring compound is determined according to the physical property index of recycled rubber and the specific needs of O-ring, and is generally controlled among 20% and 40%; For rubber O-rings with low performance requirements, nitrile recycled rubber can be completely used to effectively control production costs.
2. Key points of the design of rubber O-ring vulcanization system for the production of nitrile recycled rubber
When using nitrile recycled rubber or nitrile rubber/nitrile recycled rubber and using rubber to produce rubber O-shaped sealing rings, a sulfur-accelerator system can be commonly used, and a low-sulfur and high-vulcanization system can be used, and the vulcanized rubber has better compression permanent deformation resistance and better heat resistance. The compound E5LYY33 vulcanized in the peroxide vulcanization system has better heat aging resistance and lower compression set deformation. Nitrile recycled rubber O-ring compound can also be used in combination with peroxide to balance the mechanical strength of vulcanized rubber with heat resistance and compression set.
3. Key points of the design of rubber O-ring reinforcement filling system for the production of nitrile recycled rubber
The working pressure of rubber O-rings is different, and the hardness of O-ring compounds is different. When using nitrile rubber, nitrile recycled rubber and their combined rubber materials to produce rubber O-rings, generally, high-hardness compounds should be selected for high working pressure, and low-hardness compounds should be selected for low working pressure.
Nitrile recycled rubber, nitrile rubber/recycled rubber and glue are used to prepare high-hardness rubber, generally using carbon black with small particle size, high structure and good reinforcement effect as reinforcing agents, such as carbon black N110, N220, vapor phase silica, etc., and reinforcing resin can be used when necessary. Appropriate increase in the amount of vulcanizing agent, extend the vulcanization time, and use plastics can also improve the hardness of nitrile recycled rubber O-ring compound.
It is recommended to use spray carbon black with high wear resistance carbon black, trough carbon black and fast pressed carbon black to prepare high-hardness nitrile recycled rubber O-ring compound with small compression deformation, good wear resistance and large elongation.
4. Key points of the design of the rubber O-ring softening system for the production of nitrile recycled rubber
When using nitrile recycled rubber, nitrile rubber/nitrile recycled rubber and using glue to prepare rubber O-ring compounds, it is also necessary to reasonably select softeners, commonly used ester softeners such as dibutyl phthalate (DBP), dioctyl phthalate (DOP), dioctyl sebacate (DOS) (excellent cold resistance), liquid nitrile rubber, coumaron resin (improve adhesion), etc.
Hongyun 75% oil-resistant nitrile recycled rubber has a large oil resistance coefficient, good feel elasticity, high fineness, no impurities, smooth and bright surface of the product, high plasticity, wear resistance, good aging resistance, all or part of the replacement of nitrile original rubber to produce nitrile O-rings, which can reduce the average raw material cost of about 30% and about 10% of the production cost.
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