Preparation method of alkylated silica gel
A technology of alkylated silica gel and silica gel, applied in the directions of silica and silica, can solve the problems of uneven and regular surface polymerization layer, multi-layer structure, blockage of silica gel pores, etc., to achieve the best stability and anti-hydrolysis performance, operation Simple, low-labor effect
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Embodiment 1
[0025] The particle size of raw silica gel is 40-60 mesh, the average pore size is 11-12nm, and the surface area is 430m 2 / g, bulk density 0.43g / mL; chloropropyltrichlorosilane is the coupling agent, the molecular formula is Cl(CH 2 ) 3 SiCl 3 , at 20°C, the specific gravity r = 1.359-1.360; the synthesis method and preparation process of alkylated silica gel are as follows:
[0026]
[0027] 1. Preparation of activated silica gel: Add 200 grams of silica gel with a particle size of 40-60 mesh into the pickling kettle, add 800 mL of HNO with a concentration of 1 mol / L 3 The solution was boiled for 6 hours at boiling point temperature (bubble point temperature 103°C). After the pickling step, the reaction solution was immediately filtered through a sand core funnel, the silica gel was washed successively with pure water and methanol to make the pH reach 6, and then dried in an oven at 100°C to constant weight.
[0028] 2. Preparation of hydrated silica gel: Put the acti...
Embodiment 2
[0036]The particle size of raw silica gel is 16-80 mesh, the average pore diameter is 15nm, and the bulk density is 0.463g / mL; chloropropyltrichlorosilane is the coupling agent, and the molecular formula is Cl(CH 2 ) 3 SiCl 3 , at 20°C, the specific gravity r=1.359-1.360; the preparation process of alkylated silica gel is as follows:
[0037] 1. Preparation of activated silica gel: Add 10Kg of pre-dried microspherical silica gel directly into the enamel stirring pickling kettle with a volume of 50L, measure and add 40L of hydrochloric acid solution with a concentration of 1mol / L, and then add it at boiling point temperature and stirring speed of 54rpm. Boil at reflux for 6 hours. The acid-containing vapor evaporated from the pickling kettle is condensed by the glass condenser and returned to the pickling kettle in time. After filtering and washing, dry at 100~120°C until constant weight.
[0038] 2. Preparation of hydrated silica gel: put 10Kg of silica gel after pickling ...
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