Rubber damping pad for high-speed rail
A shock-absorbing pad and rubber technology, which is applied in the direction of shock absorbers, springs/shock absorbers, shock absorbers, etc., can solve the problems affecting the service life and migration of rubber pads, and achieve good processing, good anti-aging performance, The effect of high tensile strength
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preparation example Construction
[0027] The pretreated natural rubber, the preparation method comprises the following steps:
[0028] (1) in reactor, add 15g natural rubber and 10mL tetrahydrofuran, magnetic stirring 30min;
[0029] (2) at 65 DEG C, the 20mL tetrahydrofuran solution containing 1g of 3-mercapto-1-propanol and 0.4g of dimethyl azobisisobutyrate was added dropwise to the reactor of step (1), and the reaction was performed for 100min;
[0030] (3) 3 mL of tetrahydrofuran solution containing 0.1 g of 2,6-di-tert-butyl-4-methylphenol was added to the reaction mixture of step (2), heating and stirring were stopped; tetrahydrofuran was removed by rotary evaporation, and then methanol Liquid separation is carried out to obtain pretreated natural rubber.
[0031] Since the molecular chain of natural rubber contains carbon-carbon unsaturated double bonds, 3-mercapto-1-propanol is used as the modifier, and the molecular chain of natural rubber contains multiple hydroxyl groups through the mercapto-ene c...
Embodiment 1
[0059] A rubber shock-absorbing pad for high-speed rail, in parts by weight, its raw materials include 65 parts of natural rubber, 25 parts of butadiene rubber BR9000, 20 parts of epoxidized natural rubber ENR25, 2.5 parts of paraffin, 18 parts of modified filler, and carbon black N550 50 parts, 5 parts aromatic oil, 3 parts vulcanizing agent sulfur, 3 parts accelerator.
[0060] The natural rubber included 20 wt% pretreated natural rubber and 80 wt% untreated natural rubber. The pretreated natural rubber, the preparation method comprises the following steps:
[0061] (1) in reactor, add 15g natural rubber and 10mL tetrahydrofuran, magnetic stirring 30min;
[0062] (2) at 65 ℃, the 20mL tetrahydrofuran solution containing 1g of 3-mercapto-1-propanol and 0.4g of dimethyl azobisisobutyrate was added dropwise to the reactor of step (1), and the reaction was performed for 100min;
[0063] (3) 3 mL of tetrahydrofuran solution containing 0.1 g of 2,6-di-tert-butyl-4-methylphenol w...
Embodiment 2
[0071] A rubber shock-absorbing pad for high-speed rail, in parts by weight, its raw materials include 50 parts of natural rubber, 20 parts of butadiene rubber BR9000, 15 parts of epoxidized natural rubber ENR25, 1 part of paraffin, 15 parts of modified filler, and carbon black N550 40 parts, 2 parts of aromatic oil, 2 parts of vulcanizing agent sulfur, 1 part of accelerator.
[0072] The specific components of the natural rubber are the same as those in Example 1.
[0073] The specific components of the modified filler are the same as those in Example 1.
[0074] The specific components of the accelerator are the same as those in Example 1.
[0075] The specific steps of the preparation method of the rubber shock-absorbing pad are the same as those in Example 1.
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Abstract
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