Method for preparing modified white carbon black
A white carbon black and modified technology, applied in the direction of fibrous filler, dyed low molecular organic compound treatment, dyed high molecular organic compound treatment, etc. Carbon black and coupling agent bond energy, complex process operability and other problems, to achieve the effect of low price, good dispersion and simple process
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[0026] A preparation method of modified silica includes the following steps:
[0027] Step 1: Add silica to the reaction kettle, vacuum, heat to 130-150°C, and stir for 2 to 3 hours;
[0028] Step 2: Use inert gas to increase the pressure to 4~6MPa, keep constant temperature, and shear for 1~1.5 hours; and
[0029] Step 3: Spray the modifier, heat up to 150-165°C, apply vacuum at the same time, stir, react for 1 to 2 hours, dry and discharge.
[0030] (1) Material source
[0031] White Carbon Black Rhodia
[0032] Modifier bis(triethoxysilylpropyl) tetrasulfide Degussa
[0033] Modifier γ-(2,3-epoxypropoxy)propyltrimethoxysilane Shanghai Jingrong Biotechnology Co., Ltd.
[0034] Modifier pentaerythritol Jinan Century Tongda Chemical Co., Ltd.
[0035] Rubber solution polymerized styrene butadiene rubber SSBR2557S Dushanzi Petrochemical Branch
[0036] Other additives are commonly used in the rubber industry.
[0037] (2) Analysis method
[0038] Characterization of silica structure: DBP absorp...
Example Embodiment
[0042] Example 1
[0043] (1) Add 1000 grams of white carbon black into the grafting reactor, evacuate, stir (rate 50r / min), heat to 135°C, and activate the white carbon black structure for 2 hours.
[0044] (2) Use inert gas to increase the pressure to 4MPa, constant temperature 140℃, strong shear (shear rate 950r / min), and structure dissociation for 1 hour.
[0045] (3) 80 grams of bis(triethoxysilylpropyl) tetrasulfide is slowly and uniformly sprayed in the form of spray, stirred (rate 90r / min), heated to 155°C, and vacuumed, and the grafting reaction is carried out for 1.5 hours .
[0046] (4) After drying and cooling, the grafted modified silica is obtained.
Example Embodiment
[0058] Example 2
[0059] (1) Add 1000 grams of white carbon black into the grafting reactor, evacuate, stir (rate 60r / min), heat to 135°C, and activate the white carbon black structure for 2 hours.
[0060] (2) Use inert gas to increase the pressure to 4MPa, constant temperature 140℃, strong shear (shear rate 1100r / min), and structure dissociation for 1.5 hours.
[0061] (3) 120 grams of γ-(2,3-glycidoxy)propyltrimethoxysilane, sprayed slowly and uniformly in the form of spray, stirred (rate 90r / min), heated to 155°C, and vacuumed at the same time, The grafting reaction was carried out for 1.5 hours.
[0062] (4) Dry and cool to obtain grafted modified silica.
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