60 results about "N-pentanol" patented technology

There is provided a method for preparing a surface-modified aerogel with hydrophobicity and a surface-modified aerogel prepared therefrom. The method includes: A) adding a water glass (sodium silicate) to 0.5-2N HCl at a room temperature until the pH of solution is adjusted to 3 to 4; B) forming a silica gel by adding 1.5-10 % (percent) by weight of a non-ionic surfactant to the resulting solution, based on the total weight of the finally prepared silica powder particles, and by adding water glass so that the solution is under an acidic condition of pH 4-6; C) washing the formed silica gel with distilled water and filtering the washed silica gel; D) adding a mixture solvent of 1-40 % (percent) by weight of n-pentanol and 99-60 % (percent) by weight of n-butanol to the silica gel and further adding a silylizing agent; E) putting the mixture solution of the silica gel, the mixture solvent and the silylizing agent into a reactor, separating the solvent and moisture while maintaining a pressure level of 200 to 30 mmHg (millimeter Hg) at a temperature of 45 to 6O DEG C (centigrade) in a reactor, and then removing the moisture and refluxing the solvent again, followed by repeating this process until the moisture is completely removed from the silica gel; and F) closing a reflux line when the moisture is removed from the silica gel, and drying the solvent from the silica gel until thesilica gel is prepared in the powder form. The method may be useful to prepare a silica aerogel in the form of permanently hydrophobic powder in a short time, wherein the a silica aerogel has a highspecific surface area and high functionality, and is prepared by subjecting a wet gel to a solvent exchange process and a silylizing process in a mixture solvent including a silylizing agent at the same time, the wet gel being prepared using a water glass as a raw material and adding a surfactant at a room temperature.

The invention provides a high efficiency liquid chromatography detection method for cis isomer in vitamin K2 medicines, which adopts a normal phase chromatography column stuffed by silica gel, and a flow phase formed by one low-polarity solvent selected from hexane, pentane, petroleum ether, cyclohexane, isooctane and heptane, and one high-polarity solvent selected from butyl ether, isopropanol, pentanol, n-pentanol, tetrahydrofuran, dichloromethane and ethanol. The high efficiency liquid chromatography detection method has high sensitivity and specialization, having simple operation, high repeatability, which is beneficial for controlling the quality of raw materials and agents in production.

The invention discloses a microsphere intelligent heat-insulated window membrane and a preparation method therefor. The method comprises the following steps: (1) adding nano vanadium dioxide particles into a reactor, and adding a solvent and a vinyl silane coupling agent into the reactor, so as to obtain nano vanadium dioxide particles, of which the surfaces are connected with vinyl groups; (2) pre-emulsifying the nano vanadium dioxide particles obtained in the step (1) with water, sodium lauryl sulfate and n-pentanol; then, dropwise adding a mixed solution of a monomer and trimethylolpropane trimethacrylate, which are in the ratio of 1: 1, into a reactor at a constant speed, and dropwise adding an aqueous solution of ammonium persulfate into reactor at a constant speed; and completing the dropwise adding, then, continuing to carry out heat preservation, carrying out cooling, and then, carrying out discharging and drying, thereby obtaining vanadium dioxide nanospheres; and (3) blending the vanadium dioxide nanospheres and a pressure-sensitive adhesive, and then, coating a PET (Polyethyleneglycol Terephthalate) base membrane with the blend. According to the window membrane disclosed by the invention, indoor temperature can be conditioned intelligently, the energy consumption of air conditioners is effectively lowered, and meanwhile, the contamination and damage to the surfaces of stuck objects caused by the migration of vanadium dioxide in the pressure-sensitive adhesive are avoided.

The object of the invention is to provide a method for preparing a fluorescent-yellow shell fabric. The method comprises the steps of firstly, carrying out cold plasma treatment on a dacron-cotton shell fabric by using a CGP-3 type plasma treatment instrument, then, putting 10-20 parts of natural fatty alcohol-polyoxyethylene ether, 12-30 parts of n-pentanol, 0.05-0.25 part of active fluorescent yellow dye FL, 0.01-0.15 part of disperse fluorescent yellow dye 10GN, 40-60 parts of supercritical CO2 and 0.01-6 parts of distilled water into a high-pressure vessel so as to prepare a reversed-micellar system, and finally, putting the dacron-cotton shell fabric subjected to the cold plasma treatment into the high-pressure vessel for dyeing, thereby obtaining the fluorescent-yellow dacron-cotton shell fabric. The fluorescent-yellow dacron-cotton shell fabric prepared by the method is bright in color and luster, high in color fastness, high in elasticity and good in mechanical properties and is soft and comfortable.