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(4) Modified bentonite by microwave method
①Microwave preparation of sodium-based bentonite modifier generally uses Na 2 CO 3 , NaF, and the sodiumization reaction methods include suspension method, yard sodiumization method, roller sodiumization method, extrusion sodiumization method, double helix sodiumization Method, supercritical treatment method, Raymond milling method, hydrothermal sodiumization process, etc.
, but the sodiumization reaction requires a certain temperature and time
.
Microwave sodiumization has a shorter time and higher efficiency than the above methods
Spray the ethanol aqueous solution with a quantitative sodium compound into the calcium bentonite powder to make it fully wet, then spread the wet material evenly into a thickness of 3-20mm, and place it in a microwave field with a frequency of 900-3000MHz for rapid heating reaction 2～ After 6min, the sodium bentonite can be obtained by crushing after the reaction is completed
.
The calcium-based montmorillonite was moistened with an ethanol solution dissolved in NaCl, and then placed in a microwave field for heating and drying for 3 minutes, and the cation exchange capacity reached 1.
②Microwave preparation of organic bentonite Microwave can also be used to prepare organic bentonite.
Compared with conventional methods, the preparation of organic montmorillonite by microwave method is not only simple and easy to operate, but also can greatly accelerate the reaction rate and shorten the reaction time
.
The preparation of double-positive organobentonite by microwave shows that the suitable conditions for preparing double-positive organobentonite by microwave method are that the total amount of two cationic surfactants is 100 CEC and the microwave irradiation energy is 210 J/mL
Use quaternary ammonium salts, organic amines and composite reagents to organicize sodium bentonite in a microwave field.
The organicization time is reduced from 2 to 3 hours to 15 minutes
.
XRD analysis shows that the interlayer spacing of montmorillonite increases from 1.
Using cetyl quaternary ammonium salt as the organic modifier, the organic bentonite with excellent performance was prepared by microwave radiation heating method.
Experimental research shows that the microwave method of organic modification greatly shortens the experimental operation time and simplifies the process The process reduces energy consumption and reduces the cost of products
.
Using Chengdu Shuangliu purification, sodium bentonite as raw material, using cetyltrimethylammonium bromide (CTAB) as intercalating agent, heating with a microwave power of 480W for 1 min, the organic montmorillonite can be made The volume rate of colloid reaches 98%, the interplanar spacing increases to 2.
Weigh 2.
31g of cetyltrimethylammonium bromide, dissolve it with ultrapure water, and transfer to a 100mL volumetric flask, dilute to the mark, and shake well
.
The prepared active agent has a mass concentration of 2.
③Pillared bentonite prepared by microwave.
Bentonite is a layered silicate mineral.
After nano-pillared, its d(001) can be increased from 1.
5nm to 1.
9～3.
6nm, and the specific surface area is increased by about 4 times.
Performance and affinity are significantly increased
.
The titanium pillared activated bentonite was prepared by microwave irradiation for 20 minutes.
Related Links: Inorganic/Organic Modification of Bentonite
