Buried rubber hose is generally processed with natural rubber and styrene-butadiene rubber as the main raw materials. A small amount of low-density polyethylene can significantly improve the mechanical strength of rubber products. Therefore, rubber and plastic are often used for buried rubber hoses. At present, when many rubber product manufacturers use styrene-butadiene rubber, natural rubber and PE blend materials to produce buried rubber hoses, they will add a certain amount of recycled rubber to the formula. Why? What is the role of recycled rubber in rubber and plastic buried rubber hose? What should I pay attention to when adding?
1. The role of recycled rubber in rubber and plastic buried rubber hose
In terms of production cost, the price of recycled rubber is much lower than natural rubber, styrene-butadiene rubber, and PE materials. The use of recycled rubber in rubber and plastic buried rubber hoses can reduce the cost of raw materials; from the perspective of process performance, the addition of recycled rubber can increase rubber Viscosity, strong elongation performance and dimensional stability of the finished product, so as to achieve the2LLYY0109 purpose of extending the service life of the buried rubber hose.
2. The amount of recycled rubber is different in different layers of buried rubber hoses.
The functions of different rubber layers of buried rubber hoses are different, and there are certain differences in the performance requirements of the rubber material used. For example, the inner rubber directly contacts the conveying medium, the outer rubber directly contacts the working environment such as the ground, and the amount of recycled rubber in the outer rubber. It is much higher than the amount of recycled rubber in the inner layer of buried rubber. In general, the amount of recycled rubber in the inner layer of rubber-plastic buried rubber hose can be controlled between 50-100 parts, and the amount of recycled rubber in the outer layer can be increased to 100-120 parts or more.
3. Formulation design skills of buried rubber hose with recycled rubber
In actual production, rubber-plastic buried wire rubber hoses containing recycled rubber are mostly sulfur vulcanized. The outer rubber of the hose requires higher mechanical strength and abrasion resistance of the rubber used. Sulfur vulcanization can be used and the amount of sulfur can be appropriately increased to increase vulcanization. Rubber cross-linking density; appropriately reduce the amount of calcium carbonate to ensure the mechanical strength of buried rubber hoses; coordinate the physical indicators of recycled rubber / natural rubber / styrene-butadiene rubber / PE blending materials with the appropriate amount of softener.
When using recycled rubber to reduce the raw material cost of rubber and plastic buried rubber, you must always pay attention to the production process of the hose and adjust the rubber mixing process and vulcanization process parameters. Generally, natural rubber and styrene-butadiene rubber are fully plasticized before being mixed with recycled rubber. Refining to improve the physical properties of the buried rubber hose with recycled rubber and extend the service life.
The use of recycled rubber in rubber and plastic buried rubber hoses can not only reduce the cost of raw materials, but also improve the comprehensive indicators of buried rubber hoses. Reasonably design the formula of rubber and plastic buried rubber hoses containing recycled rubber to further optimize product quality and reduce more production costs.