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Preparation and Application of Partially Delaminated Stearic Acid Montmorillonite

Author: GaoChengXiang
Tutor: TongZhangFa；WeiTengYou
School: Guangxi University
Course: Chemical processes
Keywords: Part exfoliated montmorillonite stearate Preparation Characterization Paraffin wax
CLC: TB321
Type: Master's thesis
Year: 2008
Downloads: 110
Quote: 2
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Abstract


In this paper, prepared by boiling some refluxing exfoliated montmorillonite stearate (Partially delaminated stearic acid montmorillonite, STA-MMT). Univariate analysis method, effects of reaction time , stearic acid , ethanol dispersant additive amount of dispersant , dropping temperature, the anion exchange capacity , alkaline soil particle size and other factors on the part of exfoliated stearic Mongolia montmorillonite organic LOI impact . The optimum preparation conditions were: the 0.076 mm alkaline calcium bentonite 5.00 g compound dispersed in 75 mL of solvent (V ethanol : V cyclohexane = 1 : 9), in the modified at 50 ℃ solution was added dropwise (4.50 g stearic acid was dissolved in 60 mL of cyclohexane ) the reaction 1.5 h, the obtained organic acid content of 36.25% soil . Using XRD, FTIR, SEM, TG / DTA, DTS samples were characterized by means of experimental results show that , stearate inserted montmorillonite ; With the expansion of the interlayer spacing , montmorillonite partial peeling laminate structure . This section exfoliated montmorillonite stearate can be dispersed in ethanol to 300 nm. Comparative STA-MMT and cetyl trimethyl ammonium bromide in the performance of the modified montmorillonite was found STA-MMT gel with better performance , greater than the surface area, small particle size , and in most organic solvent dispersion . In addition, this paper synthetic STA-MMT as precursors by introducing hydrophobic solid paraffin STA-MMT interlayer prepared paraffin / STA-MMT composites investigated using single factor method best paraffin loading process conditions : 3.00 g STA-MMT was dispersed in 200 mL of ethanol mixed solvent of cyclohexane agent (V ethanol : V cyclohexane = 9:1) in the 5.00 g of solid paraffin and 55 ℃ added to the dispersion , the reaction temperature was stirred for 5 hours to obtain optimum organic loading of 71.55% , which was 36.30% paraffin loadings . X-ray diffraction and differential scanning calorimetry analysis of the main means of paraffin / STA-MMT composite structure and melting point of wax change before and after modification . Analytical testing indicated that the adsorption process , some paraffin into the montmorillonite interlayer spacing increases caused by montmorillonite , indicating that STA-MMT and paraffin has good compatibility. The differential thermal analysis also found that the modified material melting point than paraffin increased 60.7 ℃.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Non-metallic materials > Non-organic materials
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