38results about How to "Effectively control the reaction rate" patented technology

The invention relates to a production device for preparing titanium hydroxide sol. The production device comprises a storing tank (1) which is connected with a first buffer tank (3) through a first pipeline (2), the first buffer tank is connected with a second buffer tank (5) through a second pipeline (4), the second buffer tank is connected with a vacuum pump (7) through a third pipeline (6), the first buffer tank is further connected with a reaction kettle (9) through a fourth pipeline (8), the reaction kettle is filled with pure water (20), and the reaction kettle is further connected with an alkali solution storing tank (11) through a fifth pipeline (10). The production device has the advantages that the problem that acid mist is generated in the hydrolytic process of a titanium source solution like a titanium tetrachloride solution or a titanyl sulfate solution is solved, the rate of the reaction of the titanium source solution and an alkali solution is effectively controlled, the leakage of reaction solutions is avoided, the temperature in the kettle, the vacuum degree of the vacuum pump and operation of all levels of valves are effectively controlled, and the safe production operation for preparing the titanium hydroxide sol through hydrolysis of the titanium source solution like the titanium tetrachloride solution or the titanyl sulfate solution is achieved.

The invention relates to a preparation method for a coated grinding tool, and discloses a preparation method for green shallow-cured phenolic resin coated grinding tool. The preparation method includes steps of treating a base fabric; preparing impregnation liquid; adding from 30 to 50 grams of water-soluble thermosetting phenolic resin and from 70 to 170 grams of water into every 100 grams of PVAC (polymer vinyl acetate) emulsion; realizing once or twice impregnation for the base fabric by the aid of the impregnation liquid, drying and ironing the base fabric after impregnation, realizing press polish, and scratching paste according to conventional process; applying primer; planting sand for a substrate according to conventional process after the primer is applied, drying the substrate planted with the sand at the temperature ranging from 50 DEG C to 60 DEG C for 20 to 25 minutes, then drying the substrate at the temperature ranging from 80 DEG C to 90 DEG C for 15 to 20 minutes and then drying the substrate at the temperature ranging from 100 DEG C to 108 DEG C for 30 to 60 minutes; and gluing again. The primer applied at first consists of components including, by weight percentage, from 20 to 25% of packing, from 45 to 50% of water-soluble thermosetting phenolic resin and from 30 to 35% of water, and primer for the step of gluing comprises components including, by weight percentage, from 50 to 60% of water-soluble thermosetting phenolic resin, from 20 to 30% of calcium carbonate, from 0 to 5% of iron oxide and from 15 to 20% of water. The preparation method has the advantages that cost can be lowered, curing temperature is reduced, curing period is shortened, an adhesion performance is improved, and color is light.

The invention relates to the technical field of reactors and particularly belongs to a control method of a reformed alkali production reactor. CO2 is introduced into a telescopic rod moving cavity through a CO2 inlet channel and is then guided to a reaction cavity through a right channel; CO2 reacts with an aqueous solution of ammonia gas to generate NH4HCO3; a telescopic rod drives a conical plugto continuously descend until the conical plug presses the bottom of a cylindrical baffle bracket; an Nacl solution flows from an Nacl cavity into the reaction cavity; a filtering device filters outNH4cl, and NH4cl flows into the telescopic rod moving cavity through the right channel and then flows out through an NH4cl outlet pipeline; the NaHCO3 precipitate is left in the reaction cavity and decomposed; and CO2 enters a CO2 storage tank through a CO2 outlet channel for use in the next reaction. The method provided by invention has the advantages that the self-control advancement of reactionprocesses can be realized, the reaction rate can be effectively controlled, and multiple steps of reactions can be completed in one device.

The invention belongs to the technical field of nano-materials, and particularly relates to a mono-disperse hollow Prussian blue nano-sphere, a preparation method thereof and an application of the nano-sphere. The Fe2O3 nano-sphere is prepared by a solvothermal method, serves as a chemical template and is compounded with K4[Fe(CN)6], remained Fe2O3 is removed by acid to prepare the mono-disperse hollow Prussian blue nano-sphere (HPB NSs) which is uniform in appearance, and the shell layer thickness and the inner cavity size of the nano-sphere can be controlled. The preparation method is simple in process, convenient to operate and low in cost investment, and the prepared mono-disperse hollow Prussian blue nano-sphere is high in stability, biological safety, loading capacity and photo-thermal conversion efficiency and good in biocompatibility and has important application values in the field of drug carriers.

The invention discloses a preparation method of a waterborne peelable protecting film composition. The preparation method comprises the following procedures: (1) preparing an epoxy resin-butanone solution; (2) adding isophorone diisocyanate and the like into a first reaction kettle at the room temperature, so as to obtain a primary product; (3) sequentially adding dimethylolpropionic acid and triethylamine into the primary product, so as to obtain an epoxy-modified aliphatic polyurethane emulsion; (4) adding silica sol and the aliphatic waterborne polyurethane emulsion into a third reaction kettle at the room temperature, so as to obtain a mixed emulsion; (5) adding a proper amount of acrylic copolymer sylvite and the like into a fourth reaction kettle containing distilled water, so as to obtain a mixed base solution; and (6) adding the mixed emulsion into the mixed base solution, so as to obtain the waterborne peelable protecting film composition. The protecting film composition prepared by virtue of the preparation method has excellent water tolerance, relatively strong cohesion, good peelable property and relatively high paint film strength.

The invention discloses a porous titanium dioxide photocatalyst film and a preparation method thereof. A substrate participates in an oxidizing reaction, an ionic liquid is taken as a template agent, and the reaction speed is controlled, so that a pure anatase phase titanium oxide film can be directly obtained on the surface of a titanium sheet. The preparation method comprises the following steps of: preparing a mixed solution of a hydrogen peroxide solution and an ionic liquid, i.e., 1-butyl-3-methylimidazolium tetrafluoroborate; soaking a metal titanium sheet into a reaction liquid for reacting in a baking oven of 80 DEG C for couple hours; and taking the reacted titanium sheet out, and baking to obtain a titanium dioxide film. The preparation method has the advantages of readily-available raw materials, simple process, easiness for controlling conditions, short preparing period and easiness for amplifying on a large scale. The prepared pure anatase structure titanium dioxide film high the advantages of high crystallinity, high purity, firm combination with the substrate, high stability and repeatability.