Rubber sealing products have simple structure, convenient use, and stable performance. They are mainly used in various mechanical devices. They can prevent leakage of fluid media under static or moving conditions, prevent impurities such as external dust and sand from entering the interior of the sealing mechanism, and play a good sealing role. There are many types of rubber sealing products, and different products use different types of rubber; As a major category of renewable rubber resources, latex reclaimed rubber can be reasonably blended into most rubber sealing products. I will discuss this issue with you today.
1. Performance requirements for rubber sealing products
Rubber sealing products are widely used in various machinery, requiring the rubber to have sufficient mechanical strength, good elasticity, and low compression set; The rubber used for rubber gaskets, gaskets, sealing strips, and O-rings used under static conditions should also have good resistance to compression permanent deformation, media resistance, and aging resistance; Rubber sealing products used under dynamic conditions should have good wear resistance, thermal conductivity, resistance to flexion, and resistance to media aging.
In practical production, latex reclaimed rubber is used to replace natural rubber in the production of various rubber sealing products in most cases, but is rarely used in the production of sealing products that are resistant to high temperature, aging, and oil.
2. Techniques for producing O-shaped rubber sealing rings using latex reclaimed rubber
In practical production, latex reclaimed rubber can be used together with natural rubber, styrene butadiene rubber, isoprene rubber, and other rubbers to produce general-purpose rubber O-ring seals. When designing an O-ring formula containing latex reclaimed rubber, it is recommended to use a low sulfur high acceleration or sulfur free 2SLYY324 vulcanization system to obtain better compression set resistance; Spray carbon black, high wear-resistant carbon black, trough carbon black, quick extrusion carbon black reinforcement, used alone or in combination.
When using latex reclaimed rubber to produce rubber O-rings working under dynamic conditions, graphite, molybdenum dioxide, polytetrafluoroethylene powder, etc. can be appropriately used to improve the abrasion resistance of the rubber compound; The use of carbon fiber can improve the abrasion resistance of the rubber while improving the thermal conductivity, preventing heat accumulation and accelerating the aging of the rubber. When using latex reclaimed rubber/natural rubber to produce high hardness O-rings, carbon black such as N11, N220, and fumed silica with small particle size, high structural degree, and good reinforcement effect are often used as reinforcement materials, or are obtained by using reinforcement resins, increasing the amount of vulcanizing agent, extending the curing time, and using plastics.
Latex reclaimed rubber can also be used together with natural rubber, styrene butadiene rubber, and other general purpose rubbers to produce rubber sealing products such as rubber sealing strips, sealing gaskets, and brake cups. Reasonable control of the proportion of latex reclaimed rubber and general purpose rubber used together, and appropriate adjustment of the formula can further optimize the performance of rubber sealing products and extend their service life while reducing costs.
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