Rubber composition for belt, and rubber belt
A technology of rubber composition and belt, which is applied in the field of rubber composition for belts and rubber belts, can solve the problems of increased specific gravity of the compound and unsuitability for light weight, and achieve good physical properties, excellent durability, and low energy loss.
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[0074] The present invention has been specifically described using the shown Examples and Comparative Examples. In Examples and Comparative Examples, the physical properties of the raw rubber of the vinyl cis-polybutadiene rubber, and the physical properties of the compound and the vulcanized compound of the resulting rubber composition were measured as follows. The physical properties of the complexes and sulfides were evaluated based on indices calculated on the basis of Comparative Example 1 given as 100.
[0075] Physical properties of raw rubber
[0076] Based on JIS-K6300, the Mooney viscosity (ML 1+4 , 100°C) value.
[0077] The intrinsic viscosity [η] is a numerical value derived from the following expression. In this case, 0.1 g of sample rubber and 100 mL of toluene were supplied into the Erlenmeyer flask and completely dissolved at 30°C. Thereafter, 10 mL of the solution was added to a Cannon-Fenske dynamic viscometer placed in a constant temperature water tank ...
manufacture example 1
[0103] Production example 1 (vinyl cis-polybutadiene rubber: production of sample A-1)
[0104] A stainless steel reactor equipped with a stirrer having an internal volume of 5 L purged with nitrogen was prepared, and 3.5 L of a polymerization solution (butadiene: 30% by mass, cyclohexane: 70% by mass) was supplied thereto. In addition, 5.3 mmol of water, 10.5 mmol of diethylaluminum chloride, 1.8 mmol of carbon disulfide, 32 mmol of cyclooctadiene, and 0.03 mmol of cobalt octoate were added, followed by stirring at 50°C for 30 minutes to carry out cis-1,4 polymerization (a- 1). Further, 10% by mass (relative to the obtained vinyl cis-polybutadiene rubber) of polyisoprene (IR) (ML=87, cis-1,4 structure=98 mol%) was supplied to the obtained polymerization product solution, This was followed by stirring at 50°C for 1 hour. Thereafter, 560 mL of butadiene, 4.5 mmol of water, 13.4 mmol of triethylaluminum chloride, and 0.07 mmol of cobalt octoate were added, followed by stirring...
manufacture example 2
[0105] Production example 2 (vinyl cis-polybutadiene rubber: production of sample A-2)
[0106] Except that the hydrocarbon solvent was changed from cyclohexane to benzene and polyisoprene (unsaturated polymer substance) was not added, vinyl cis-polybutanediene was similarly produced by the production method of sample A-1. vinyl rubber (A-2).
[0107] The physical properties of Sample A-1 and Sample A-2 are shown in Table 1.
[0108] [Table 1]
[0109]
[0110]
[0111] * 1: The number of crystal fibers with a fiber length of 200 nm or less
[0112] Next, the natural rubber, carbon black, and silica shown in the compounding table in Table 2, and the compounding ingredients shown in Table 4 other than the vulcanization accelerator and sulfur were supplied to the above-mentioned sample A-1. The mixture was mixed / kneaded for 4 minutes using a Bunbury mixer, and then an open mill was used to compound the vulcanization accelerator and sulfur to obtain the compounds of Exa...
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