Rubber has high elasticity, high viscosity, and has remarkable effects on buffering, shock absorption and dynamic sealing. The shock absorbing rubber parts made of natural rubber as the main material have good hysteresis and damping performance, and can undergo large reversible deformation, and are widely used in isolation in various occasions. Vibration and shock absorption. In actual production, the shape and size of natural rubber shock absorbing products vary greatly in different occasions. Among them, natural rubber thick rubber products for shock absorption are very different from thin shock absorbing products in terms of raw materials, formulations and processes.
1. Reference formula for thick rubber products used in natural rubber production for shock absorption
70 parts of natural rubber, 30 parts of styrene-butadiene rubber, 20 parts of zinc oxide, 2 parts of stearic acid, 50 parts of high wear-resistant carbon black, 10 parts of precipitated silica, 1.5 parts of paraffin, 5 parts of aromatic oil, 1010NA antioxidant 1.5 parts, 2.5 parts of antioxidant RD, 2 parts of accelerator OTOS, 1 part of accelerator CZ, 0.5 part of sulfur; total: 196 parts.
2. The main raw material of thick rubber products used in natural rubber production for shock absorption
When using natural rubber to produce thick rubber products for shock absorption, appropriate addition of styrene-butadiene rubber can further improve the wear resistance, heat resistance and aging resistance of the vulcanizate. In order to reduce the production cost of rubber shock absorption products, it is recommended to use an appropriate amount of reclaimed rubber 2ELYY422 or reclaimed rubber powder in the formula. The reclaimed rubber is preferably latex reclaimed rubber and tire reclaimed rubber; the waste tire rubber powder in the reclaimed rubber powder can be used as filler. It is added to the production of thick shock-absorbing rubber products to improve the wear resistance and tear resistance of the rubber compound and reduce the cost of raw materials.
The use of reclaimed rubber in thick rubber products for natural rubber shock absorption can not only reduce production costs, but also improve the plasticity, fluidity, dimensional stability, and small expansion and shrinkage of rubber materials; the addition of reclaimed rubber can also reduce natural rubber vulcanization. craft.
3. Formula design of thick rubber products for shock absorption in natural rubber production
When natural rubber is used as the main raw material to produce thick products for shock absorption, the thick products need to be vulcanized for a long time. Therefore, the design of the vulcanization system is particularly important. It is recommended to use the accelerator OTOS/CZ/sulfur system. In the reinforcement filling system, it is recommended to increase the amount of metal oxide reinforcement fillers as much as possible under the premise of performance to improve the heat aging resistance and enhance heat conduction. The anti-aging system uses a variety of anti-aging agents that can produce synergistic effects together, which has better protection effect and is not easy to spray.
4. The key points of natural rubber production process of thick rubber products for shock absorption
When natural rubber produces thick products for shock absorption, the vulcanization pressure is too small or the pressure holding time is too short, and the pressure in the mold cavity is insufficient, which makes it difficult to remove the rubber compound, compounding agent and volatile substances generated during the production process, and form inside the thick product. Micropores directly affect the performance and service life of rubber products. The problems of lack of glue, lack of pressure and lack of sulfur in the production process of thick rubber products for shock absorption are difficult to find and need to be strictly guarded against.
For thick natural rubber products, high-temperature vulcanization is difficult to make the inner and outer rubber compounds reach a flat range at the same time, resulting in under-sulfur inside when the outer part of the product is being vulcanized; In order to ensure the uniform vulcanization of thick rubber products for shock absorption, it is recommended that the vulcanization temperature should be lower in terms of vulcanization conditions, or the operation method of gradually increasing temperature should be adopted.
In actual production, selecting appropriate rubber raw and auxiliary materials, rationally designing the formula of thick rubber products for shock absorption of natural rubber, and strictly controlling the production process, especially the vulcanization process conditions and degree of vulcanization, can further improve the comprehensive performance of thick rubber products for shock absorption. , reducing further costs.
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