The combined use of butyl virgin rubber and butyl reclaimed rubber in an appropriate ratio 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 after vulcanization with different vulcanization systems. When using butyl rubber/reclaimed rubber to produce rubber products, the blending ratio of butyl rubber/reclaimed rubber is directly related to the vulcanization system.
1. The best ratio of butyl rubber to reclaimed rubber during sulfur vulcanization
(1) The amount of vulcanizing agent: when butyl rubber and butyl reclaimed rubber are used together with sulfur vulcanization, the tensile strength and elongation at break of the vulcanized rubber decrease slightly with the increase of the amount of butyl reclaimed rubber; The tensile stress, permanent deformation and hardness of the vulcanized rubber increased; the tear strength of 2LLYY915 showed a curve that first increased and then decreased with the increase of the amount of butyl reclaimed rubber, and the peak appeared at about 40 parts. The overall performance of the material is better.
(2) Performance of vulcanized rubber: It is advisable to select sulfur-vulcanized butyl rubber/reclaimed rubber blends and control the proportion of reclaimed rubber at about 30-60 parts. The specific amount depends on the performance requirements of rubber products and the content of butyl reclaimed rubber. The amount is determined. It should be noted that butyl reclaimed rubber can also appear in butyl rubber products in the form of fillers. At this time, sulfur vulcanization is selected, and the filling amount of butyl reclaimed rubber is controlled at about 40-60 parts. The comprehensive physical properties of butyl vulcanized rubber better.
2. The best ratio of butyl rubber to reclaimed rubber during resin vulcanization
(1) The amount of vulcanizing agent: In actual production, after vulcanization of butyl rubber and reclaimed rubber, the tensile strength, elongation at break, and tensile stress of the blend will increase with the increase in the amount of reclaimed rubber. Decrease, hardness basically unchanged, permanent deformation and tear strength increased. When the amount of butyl reclaimed rubber is controlled at about 30 parts, the combined performance of butyl rubber/reclaimed rubber is better. When butyl reclaimed rubber appears as a filler in the formulation of butyl rubber products, the amount of butyl reclaimed rubber in the resin-vulcanized butyl rubber compound can be controlled between 20-80 parts.
(2) Vulcanized rubber performance: The internal cross-linking density of butyl rubber/reclaimed rubber vulcanized rubber vulcanized with resin is higher, and the product has better aging resistance and flex resistance. When using 2402 phenolic resin to vulcanize, with the increase of the amount of resin, the tensile strength and permanent deformation of butyl rubber/reclaimed rubber vulcanizates slightly increase, the hardness increases, and the elongation at break and tear strength decrease. , The amount of resin is controlled at about 7 parts, and the overall performance of the vulcanizate is better. In the common phenolic resin/tin chloride vulcanization system, increasing the amount of tin chloride can improve the vulcanization performance of butyl reclaimed rubber, and too much usage will affect the physical and mechanical properties of the vulcanized rubber.
Compared with butyl virgin rubber, butyl reclaimed rubber has better heat resistance and aging resistance, and its air tightness is comparable to that of butyl virgin rubber. Blending butyl reclaimed rubber with butyl rubber, choosing a suitable vulcanization system, and reasonably controlling the ratio of butyl rubber to butyl reclaimed rubber can improve the processing performance and product performance of butyl rubber, and effectively reduce the cost of raw materials.
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