When using reclaimed rubber to produce rubber products, the reasonable design of vulcanization formula can meet the product performance requirements and processing technology requirements, give full play to the potential of raw materials, and achieve the economic benefits of high efficiency, low consumption and high performance. In actual production, the vulcanization formula of reclaimed rubber is a multi-system, and there are many types of raw materials, which can be classified according to their functions. Today, Xiaobian will share with you the functions and selection points of several types of compounding agents commonly used in the formulation of recycled rubber products.
1. Raw rubber and recycled rubber
Rubber raw materials are the main materials of recycled rubber vulcanization formula, mainly including raw rubber and reclaimed rubber, which can give the rubber basic mechanical properties and different special properties, such as natural rubber and latex reclaimed rubber E4LYY131 can give the rubber high mechanical strength, EPDM rubber and EPDM reclaimed rubber provide good high and low temperature resistance and anti-aging performance for the rubber, butyl rubber and butyl reclaimed rubber have good air tightness, heat resistance, chemical corrosion resistance, nitrile rubber and nitrile reclaimed rubber have excellent oil resistance, etc.
When selecting rubber raw materials for recycled rubber products, it is necessary to select the appropriate reclaimed rubber and original rubber according to the requirements of the main mechanical properties and special properties of the rubber compound, which can be used separately or combined to achieve a good comprehensive effect.
2. Vulcanization system
The vulcanization system compound in the vulcanization formula of recycled rubber can accelerate the vulcanization speed, reduce the vulcanization time, improve the production efficiency, and improve the mechanical properties of the reclaimed rubber vulcanized rubber. The vulcanization formula of reclaimed rubber needs to determine the vulcanization system according to the chemical structure characteristics of reclaimed rubber and original rubber and the main physical property requirements of rubber compounds. For multi-component products, the vulcanization system and vulcanization speed of each rubber compound should be different to ensure that the product achieves the consistency of vulcanization; When different varieties of raw rubber and recycled rubber are used together, the design of vulcanization system should consider the problem of co-vulcanization.
3. Anti-aging system
The main function of the anti-aging system in the recycled rubber vulcanization formula is to improve and enhance the aging resistance of the rubber compound, such as heat resistance, oxidation resistance, ozone resistance, etc., and prolong the service life of the product. To design the anti-aging system of reclaimed rubber products, it is necessary to select antioxidants and surface protective agents with good efficiency according to the use conditions of rubber materials, and pay attention to the influence of antioxidants on the vulcanization speed, such as p-phenylenediamine antioxidants.
4. Reinforcement filling system
The main function of the reinforcing filling system in the recycled rubber vulcanization formula is to improve the mechanical properties of the rubber compound, so that the rubber compound has higher quality and use value, and reduce the cost. Design the reinforcing filling system of reclaimed rubber products, and it is recommended to choose carbon black with good reinforcing performance for products with high performance or some parts of multi-component products, and different types of carbon black for different products or components; With the appropriate amount of inorganic filler, the cost can be reduced; When selecting the filler reinforcing agent, pay attention to the processability of the rubber compound.
5. Softening plasticizing system
The main function of the softening and plasticizing system in the recycled rubber vulcanization formula is to reduce the plasticizing and mixing time, reduce labor consumption and save energy; Improve the flexibility and self-adhesion of reclaimed rubber compounds, improve the processing technology properties of rubber compounds such as calendering, extrusion and molding, and also improve some physical and mechanical properties of rubber compounds. When designing the softening and plasticizing system of reclaimed rubber products, it is necessary to select different types of softeners according to the polarity of the original rubber and the reclaimed rubber to obtain better compatibility. According to the process conditions, whether to add plasticizers is considered to enhance the softening effect.
6. Special coordination system
Anti-scorching agents will also be used in the production of reclaimed rubber products, which can prolong the vulcanization induction period to delay scorching; An appropriate amount of tackifier can improve the adhesion among the reclaimed rubber compound and the skeleton material. According to the special requirements of reclaimed rubber products, different types and varieties of special compounding agents are selected.
Reasonable design of vulcanization formula of recycled rubber products can further improve the quality of rubber compounds, meet the physical property needs of more rubber products, reduce production costs, and effectively improve economic benefits.
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