8results about How to "Preparation method is stable" patented technology

This invention relates to a method for manufacturing a polyacetal copolymer, comprising: a step of copolymerizing 100 parts by mass of trioxymethylene (A), 0.05 to 5 parts by mass of a cyclic acetal compound (B), and 0.001 to 1 parts by mass of an aliphatic glycidyl ether compound (C) with a chlorine content of 1 to 500 ppm by mass in the presence of a linear dimethoxymethane compound (D) as a molecular weight regulator; wherein in this step, when the total mass (g) of (A) to (C) is set as a, the number of moles of (D) is set as b, and the total number of moles of water and methanol contained in (A) to (C) are set as c and d respectively, the method is set to satisfy (b+c+d) / a = 1.5 to 7 μmol / g.

The present application relates to the technical field of mineral material microcharacterization, and in particular to a method for dispersing clay mineral monolayer suitable for transmission electron microscope observation. The method for dispersing clay mineral monolayer based on stage alcohol intercalation and exfoliation comprises the following steps: dispersing clay mineral in deionized water to obtain a clay mineral suspension system by stirring; adding small molecule alcohol to the suspension system first and then adding macromolecular alcohol, and stirring to obtain a dilute dispersion system; performing ultrasonic treatment to make the clay mineral form a dispersion system mainly in monolayer or few-layer structure; dropping onto a carrier film for transmission electron microscope to make the lamella spread on the surface of the carrier film; and observing by using a transmission electron microscope. The present application is conducive to obtaining clay mineral monolayer samples with good dispersion and complete structure, and is suitable for morphology and structure characterization under transmission electron microscope.

The application belongs to the technical field of polyether preparation, and discloses a solid superbase catalyst and a method for preparing isomeric alcohol polyether by using the same. The solid superbase catalyst comprises a catalyst carrier and a strong base loaded on the catalyst carrier; the strong base is at least one selected from CH3OK, CH3ONa, KOH and NaOH; and the catalyst carrier comprises one of MgO, ZrO2 and Al2O3. The solid superbase catalyst provided by the application is composed of a catalyst carrier and a strong base loaded on the catalyst carrier, and has high catalytic activity and high reaction efficiency. When the solid superbase catalyst is used as a catalyst, isomeric alcohol polyether with low odor, narrow molecular weight distribution and few by-products can be prepared.

This application discloses a method for preparing a supported molecular sieve catalyst, the catalyst prepared therefrom, and its application. The molecular sieve is supported on Ni and ruthenium nitride, wherein the mass content of Ni is 0.5-2 wt%, the mass content of ruthenium nitride is 0.5-2 wt%, and the remainder is molecular sieve; the method includes the following steps: (1) immersing the molecular sieve in a solution containing nickel salt, drying, calcining, and reducing with hydrogen to obtain a Ni-supported molecular sieve; (2) immersing the Ni-supported molecular sieve in a ruthenium nitride complex solution, evaporating to dryness, to obtain the supported molecular sieve catalyst; the molecular sieve is selected from at least one of ZSM-5 molecular sieve, MOR molecular sieve, MCM-41 molecular sieve, and Beta molecular sieve.

The invention relates to silver powder internally provided with holes and a preparation method of the silver powder. The preparation method comprises the steps that a reducing solution containing a reducing agent, a dispersing agent, a surface modifying agent and nanocrystalline seeds and a silver solution containing silver nitrate are prepared; in the stirring state, the reducing solution is added into the silver solution for a reaction, after the reaction is conducted for a first preset time, a coating agent is added, after the reaction is continued for a second preset time, the reaction is ended, silver powder slurry is obtained, and the second preset time is longer than the first preset time; the silver powder slurry is subjected to solid-liquid separation, solids obtained through separation are cleaned, the cleaned solids are subjected to rinsing, secondary coating and drying, and the silver powder with the holes inside is obtained, so that the preparation method of the silver powder with the multiple holes inside is provided, the prepared silver powder has higher sintering activity, and the prepared silver powder has the good sintering performance. The preparation method is more suitable for the field of photovoltaic conductive silver paste, and the preparation method is simple and rapid, does not need complex subsequent treatment, is stable in reaction, and is beneficial to large-scale and continuous mass production.

This application discloses a nitrogen-containing catalyst for the dehydrogenation of cyclohexane to benzene, its preparation method, and its application. The catalyst comprises a hierarchical porous molecular sieve and a nitride supported on the surface of the sieve; the nitride is selected from FeN and / or Fe₂N. The catalyst provided in this application can be applied to the dehydrogenation reaction of cyclohexane to produce benzene and improves the conversion rate of cyclohexane and the selectivity of the benzene produced. The preparation method is stable, controllable, and reproducible. The method for the dehydrogenation reaction of cyclohexane to produce benzene provided in this application uses the catalyst provided in this application, resulting in a fast reaction rate, high yield, and applicability to large-scale production.

The present application relates to a kind of rare earth complex light stabilizer and its preparation method and use, the rare earth complex light stabilizer includes [Ce (triRNTB) 2]X3 And / or RE (BP) 3, the rare earth complex light stabilizer includes 40-100 parts by weight of [Ce (triRNTB) 2]X3 And 0-60 parts by weight of RE (BP) 3.The present application uses the rare earth complex as new functional additive is introduced into organic fluorescent dye light conversion system.By constructing "light conversion-stable" dual functional composite system, both can solve the light stability bottleneck of small molecule dye, also can realize light conversion efficiency compensation using the light-induced luminescence enhancement effect of complex.The strategy provides innovative material design ideas for developing long life, high stability blue light conversion film, and has important practical significance for promoting the technology upgrading of light conversion material.

This invention relates to the field of interlayer technology in laminated glass, and particularly to a binary composite plasticized gradient structure PVB interlayer, its preparation method, and laminated glass. The interlayer has a three-layer gradient structure, consisting of a first surface layer, a middle sound-insulating layer, and a second surface layer from the outside in. Both the first and second surface layers contain a first PVB resin and a first composite plasticizer, which includes diethylene glycol dibenzoate and 3GO. The middle sound-insulating layer contains a second PVB resin and a second composite plasticizer, which includes a mixture of diethylene glycol dibenzoate and 3GH. This invention, through innovative material formulation and structural design, provides a PVB interlayer solution that balances high weather resistance, excellent sound insulation, strong adhesion, low plasticizer migration tendency, and additional heat insulation functions. It also includes a stable and efficient preparation method, effectively overcoming the limitations of existing technologies where performance cannot be synergistically improved.