Rubber composition
A rubber composition and rubber technology, applied in transportation and packaging, special tires, tire parts, etc., can solve the problems of reduced wet braking resistance and wet braking performance
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[0013] The preparation method of the softener containing the asphalt component is not particularly limited. In the traditional purification process of the hydrogenated naphthenic oil, the asphalt is mixed into the hydrogenated naphthenic oil in advance or the main components of the asphalt are added to the hydrogenated naphthenic oil in an appropriate ratio. In hydrogen naphthenic oil, softeners can be prepared by this. However, from the viewpoint of ease of preparation or economic reasons, a method for preparing a softener in which pitch is dissolved in a hydronaphthenic oil is preferred. When the softener is used for extended oil or mixed oil, the preparation method of the softener containing the bituminous component can be used.
[0014] In addition, it is preferable that the hydrogenated naphthenic oil contains a cycloalkane content of at least 30% CN as measured by ASTM D2140 (i.e., a common name for ring analysis). Naphthenic oils containing less than 3% by weight of PCA may...
preparation Embodiment 1
[0059] (B) Feasibility study: Preparation of rubber (raw polymer) Preparation Example 1 (SBR-1)
[0060] After purging the volume of a 1 liter pressure-resistant glass container with nitrogen, 256 g of cyclohexane, 21 g of styrene and 39 g of butadiene were added, and then 0.11 mmol of ditetrahydrofuran propane and 0.36 mmol of n-butyl were added. Lithium was polymerized at 50°C for 3 hours. After 3 hours, 0.5 ml of 2-propanol was added and the reaction stopped. A solution in which 0.5 g of 2,6-dibutyl-p-cresol was dissolved in 5 ml of isopropanol was added as an antioxidant to the above polymer solution. The results of analyzing the microstructure of the polymer with respect to a part of the obtained polymer solution are shown in Table 3.
preparation Embodiment 2
[0061] Preparation Example 2 (SBR-2)
[0062] After purging the volume of the 1 liter pressure-resistant glass container with nitrogen, 289 g of cyclohexane, 3 g of styrene and 57 g of butadiene were added, and then 0.55 mmol of ditetrahydrofuran propane and 0.36 mmol of n-butyl were added. Lithium was polymerized at 50°C for 3 hours. After 3 hours, 0.5 ml of 2-propanol was added and the reaction stopped. A solution in which 0.5 g of 2,6-dibutyl-p-cresol was dissolved in 5 ml of isopropanol was added as an antioxidant to the above polymer solution. The results of analyzing the microstructure of the polymer with respect to a part of the obtained polymer solution are shown in Table 3.
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