The traditional rubber inner tube is processed with natural rubber as the main raw material, and the natural rubber/styrene butadiene rubber is used to produce the inner tube, which can further improve the heat resistance, wear resistance, aging resistance and vulcanization process performance of the rubber inner tube. With the continuous development of butyl rubber, the rubber innertube market is occupied by a large number of butyl innertubes. Butyl reclaimed rubber processed from waste butyl innertubes has excellent airtightness, watertightness, corrosion resistance, and chemical resistance. Stability, etc., can be recycled and reused in the production of rubber inner tubes.
1. The role of butyl reclaimed rubber in NR/SBR inner tube
Adding a certain proportion of butyl reclaimed rubber to the natural rubber/styrene butadiene rubber combined rubber can significantly improve the air permeability, heat resistance, and tear resistance of the rubber inner tube, and reduce the cost of raw materials. Under the condition that the amount of natural rubber/styrene-butadiene rubber 2LLYY93 remains unchanged, the amount of butyl reclaimed rubber directly affects the indicators of rubber inner tubes. Rubber product manufacturers should reasonably control the amount of butyl reclaimed rubber to ensure the performance and use of rubber inner tubes. life.
2. The fineness of butyl reclaimed rubber affects the air permeability resistance of NR/SBR inner tubes, etc.
When using butyl reclaimed rubber to improve the comprehensive performance of NR/SBR inner tubes and reduce the cost of raw materials, the inner tube has strict requirements on the fineness of butyl reclaimed rubber to ensure the smooth extrusion of the finished inner tube, smooth and bright surface, and avoid the appearance of particles on the inner tube surface. Scorch and other issues. Under normal circumstances, natural rubber/styrene butadiene rubber inner tubes use butyl reclaimed rubber with 80 mesh or more without any impurities, which can effectively avoid the above problems affecting the air tightness of the rubber inner tube and ensure the performance and life of the rubber inner tube.
3. The amount of butyl reclaimed rubber affects the physical and mechanical properties of NR/SBR inner tubes
When using butyl reclaimed rubber for NR/SBR inner tubes to reduce costs and improve performance, the amount of butyl reclaimed rubber has an impact on the physical and mechanical strength of the inner tube product. In the same vulcanization time, the tensile strength of NR/SBR innertubes increases first and then decreases with the increase in the amount of butyl reclaimed rubber. The changes in hardness, elongation at break, and tear strength are small, 300% fixed The tensile stress decreases with the increase in the amount of butyl reclaimed rubber. The more butyl reclaimed rubber is used, the permanent deformation of the inner tube will increase.
In actual production, the amount of butyl reclaimed rubber in NR/SBR inner tubes is generally controlled between 20-30 parts (the total amount of natural rubber and styrene-butadiene rubber is based on 100 parts). After more than 30 parts, the inner tube product will tear Indexes such as crack strength will be significantly reduced, resulting in a shortened service life of NR/SBR/R-IIR inner tubes.
In actual production, proper adjustment of the production process of NR/SBR inner tube containing butyl reclaimed rubber can further improve the product index of inner tube, further increase the amount of butyl reclaimed rubber, and reduce more raw material costs. Later editors will share with you the combined rubber compound Problems that need to be paid attention to in rubber mixing and vulcanization processes and the skills that must be mastered.
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