The combination of butyl rubber and butyl recycled rubber in the right proportion can not only ensure the performance and service life of butyl rubber products, but also significantly reduce the cost of raw materials. In actual production, butyl rubber products mostly choose sulfur vulcanization or resin vulcanization, and there are certain differences in the physical properties of butyl rubber materials after vulcanization of different vulcanization systems. When using butyl rubber/recycled rubber and rubber to produce rubber products, the blending ratio of butyl rubber/recycled rubber is directly related to the vulcanization system.
1. The best ratio of butyl rubber to recycled rubber when sulfur vulcanization
(1) Amount of vulcanizing agent: When butyl rubber and butyl regenerated rubber are selected with sulfur vulcanization with rubber, the tensile strength and tearing elongation of vulcanized rubber decrease slightly with the increase of butyl regenerated rubber; the constant elongation stress, permanent deformation and hardness of butyl vulcanized glue increase; tearing strength 2LLYY915WFM shows a curve of first increasing and then decreasing with the increase of butyl regenerated rubber, and the peak occurs at about 40 parts, and the comprehensive performance of the blended rubber is better.
(2) Vulcanized rubber performance: the proportion of regenerative rubber added in the sulfur vulcanized butyl rubber/recycled rubber blend compound is controlled at about 30-60 parts, and the specific dosage is determined according to the performance needs of rubber products and the rubber content of butyl recycled rubber. It should be noted that butyl regenerative rubber can also appear in the form of butyl rubber products in the form of fillers, at this time, sulfur vulcanization is selected, butyl regenerative rubber filling capacity is controlled at about 40-60 parts, butyl sulfide rubber comprehensive physical properties index is better.
2. The best ratio of butyl rubber to recycled rubber when resin vulcanization
(1) Amount of vulcanizing agent: In actual production, after the resin vulcanization is selected with the rubber of butyl rubber and the rubber, the tensile strength, tearing elongation, fixed tensile stress and other indicators of the blend decrease with the increase of the amount of regenerated glue, the hardness is basically unchanged, and the permanent deformation and tear strength are increased. When the amount of butyl recycled rubber is controlled at about 30 parts, the comprehensive performance of butyl rubber/recycled rubber and rubber is better. When butyl regenerative rubber appears in the formulation of butyl rubber products in the form of fillers, the amount of butyl regenerative rubber in resin vulcanized butyl rubber can be controlled between 20-80 parts.
(2) Vulcanized rubber performance: the use of resin vulcanized butyl rubber / recycled rubber vulcanized rubber internal crosslinking density is higher, the product aging resistance, bending resistance is better. When using 2402 phenolic resin vulcanization, with the increase of resin consumption, the tensile strength and constant elongation stress of butyl rubber/recycled rubber vulcanized rubber increase slightly, the hardness increases, the tensile elongation and tear strength decrease, the amount of resin is controlled at about 7 parts, and the comprehensive performance of vulcanized rubber is better. In the common vulcanization system composed of phenolic resin/tin chloride, the increase in the amount of tin chloride can improve the vulcanization performance of butyl regenerated rubber, and too much will affect the physical and mechanical properties of the vulcanized rubber.
Compared with butyl rubber, butyl recycled rubber has better heat resistance and aging resistance, and its air tightness is comparable to that of butyl rubber. Mixing butyl recycled rubber in butyl rubber, selecting a suitable vulcanization system, and reasonably controlling the ratio of butyl rubber and butyl recycled rubber can improve the processing performance of butyl rubber and the performance of products, and effectively reduce the cost of raw materials.
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