Method for continuously preparing liquid reclaimed rubber by aid of screw extruder
A technology of screw extrusion and reclaimed rubber, which is applied in the field of desulfurization and regeneration of waste rubber, can solve the problems of discontinuity and large pollution, and achieve the effects of reducing smoke pollution, reducing energy consumption, and significant economic benefits
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Embodiment 1
[0016] Example 1: Use 100 parts of waste tire tread rubber powder with a particle size of 0.1 mm, add 20 parts of pine tar, 4 parts of rosin, 6 parts of dipentene, and 0.5 part of disulfide alkylphenol (activator 420) for regeneration agent, mixed and stirred in the mixer at 60°C for 30min, then stood at 80°C for 6h, and then fed it into the co-rotating twin-screw extruder (D=30mm, L / D=52 / 1, 6 pieces Heating section): the screw speed is 100r / min. The temperature of each heating section is set to 120°C, 150°C, 200°C, 250°C, 150°C, 100°C respectively, and the maximum pressure reaches 4.5MPa. After reacting for 12 minutes, extrude through the die of a screw extruder to obtain liquid reclaimed rubber. Its properties as asphalt are as follows: softening point 50.3°C, penetration (0.1mm) 64.3, ductility at 15°C > 100cm. After being used with 50 parts of base asphalt, the properties are as follows: softening point 49.6°C, penetration (0.1mm) 66.9, ductility at 15°C > 100cm.
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Embodiment 2
[0018] Embodiment 2: 100 parts of waste tire tread rubber powder with a particle size of 1 mm are used, 6 parts of pine tar, 4 parts of naphthenic oil, 0.5 part of phenyl mercaptan, and 0.5 part of n-butylamine are used as regenerants, and 100 parts in a mixer After mixing and stirring for 10 min at ℃, place it at 50 ℃ for 36 h. Then it is added into a co-rotating twin-screw extruder (D=30mm, L / D=52 / 1, six heating sections) by a feeding device: the screw speed is 150r / min, so that the temperature of each heating section is respectively Set to 120°C, 180°C, 230°C, 280°C, 150°C, 100°C, change the internal thread composition of the screw and add right-handed thread elements to make the maximum pressure reach 7.5Mpa. After reacting for 5 minutes, extrude through the die of the screw extruder to obtain liquid reclaimed rubber. Its properties as asphalt are as follows: softening point 50.7°C, penetration (0.1mm) 61.9, ductility at 15°C > 100cm. After being used with 50 parts of ba...
Embodiment 3
[0020] Example 3: Use 100 parts of waste ethylene-propylene rubber with a particle size of 1 mm, add 15 parts of paraffin oil, 5 parts of paraffin oil, and 1 part of alkylphenol disulfide as a regenerant, mix and stir in a mixer at 150 ° C for 15 minutes, and then place it at 120 ° C Let stand for 36h. It was then fed into a co-rotating twin-screw extruder (D=30 mm, L / D=52 / 1, six heating zones) through a feeding device. The screw speed is 120r / min. The temperature of each heating section is set to 140°C, 200°C, 280°C, 380°C, 200°C, 150°C respectively, and the maximum pressure reaches 6.0MPa. After reacting for 10 minutes, the liquid ethylene-propylene reclaimed rubber can be obtained after extruding from the die of the screw extruder. It is used together with 20 parts of pure ethylene-propylene rubber, and the properties are as follows: tensile strength 12.8Mpa, elongation at break 350%, aging in hot air (80°C×168h) tensile strength change rate -25%, elongation at break Rat...
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