43results about How to "Facilitate redispersion" patented technology

A powdered polyurethane, preferably a powdered recycled polyurethane rigid foam is co-dried with a water insoluble film-forming polymer to obtain a redispersible polymer powder composite for use in hydraulic binders or cementitious compositions to improve performance of cementitious compositions or mortar, in applications such as cement based the adhesives (CBTA), or external thermal insulating composite systems (ETICS).

The invention discloses a dehydrogenation catalyst, which uses silica as a carrier, Pt as a dehydrogenation active component, Sn as a first aid, one or more metal of Cu, Fe, Co and Ni other as a second aid; and the catalyst comprises 0.1%-2% of the dehydrogenation active component, and calculated by the weight of the carrier 0.1-10 wt% of the first aid and 0.1-10 wt% of the second aid. A preparation method of the dehydrogenation catalyst is as below: loading the first aid Sn and the second aid, which is one or more selected from Cu, Fe, Co and Ni, and the active component Pt, by using silica gel as the carrier through an immersion method. This method can substantially increase the activity and stability of the catalyst and selectivity of alkene.

The invention relates to a preparation method of aqueous solution redispersible cellulose nano fibrils. The method comprises the following steps: firstly beating the plant fiber raw material, and then performing nano-homogeneous treatment on it to obtain a CNF suspension, adjusting the pH of the prepared CNF suspension, adding a certain amount of potassium chloride, and performing drying treatment. In the method of the present invention, a mechanical method is adopted to prepare CNF, and the yield is relatively high. In the method of the present invention, the pH is adjusted, and the CNF suspension treated with salt is easily redispersed in aqueous solution after vacuum drying, and the stability and other characteristics after redispersion are good, and the method can reduce the storage and transportation costs of cellulose nanofibrils , and the operation is simple, suitable for large-scale production. This provides new ideas and new methods for the high-value utilization of cellulose, and provides a new method for the preparation of aqueous solution redispersible CNF.

The invention relates to the field of catalysts, and specifically provides a method for regenerating a deactivated propane dehydrogenation catalyst, the method comprising: a) deactivating the dehydrogenation catalyst in a propane dehydrogenation reaction, first cooling it in an inert gas atmosphere to a temperature of 300 ℃ -500°C, at this temperature, perform regeneration treatment in a weakly oxidizing gas atmosphere; b) then continue to cool down to 200-300°C in an inert gas atmosphere, at this temperature, under the atmosphere containing oxygen, water vapor and inert gas Carry out regeneration treatment under a mixed gas atmosphere of at least two of them; c) after step b) finishes, replace the mixed gas with an inert gas to the inert atmosphere and drop the temperature to 50-100 ° C, at this temperature, in the presence of organic matter Carry out regeneration treatment; the dehydrogenation catalyst is a catalyst containing precious metals. The method of the invention can effectively restore the performance of the catalyst and improve the utilization rate of the catalyst.

The invention discloses a copolymerized nanocomposite material, a preparation method and application thereof. The preparation method of the copolymerized nanocomposite material comprises the following steps: 1) mixing amide monomers and benzenesulfonate monomers with a solvent, adding a crosslinking agent, and stirring to obtain a comonomer reaction system; 2) adjusting step 1 ) the pH value of the obtained comonomer reaction system, and add the inorganic nanophase, stir to obtain a reactant mixed system; 3) under anaerobic conditions, mix the reactant mixed system, oxidizing agent and reducing agent obtained in step 2) After stirring for a certain period of time, the temperature is raised to carry out a copolymerization reaction to obtain a copolymerized nanocomposite material. The invention also provides a copolymerized nanocomposite material and its application. The copolymerized nanocomposite material prepared by the method of the invention is more conducive to the redispersion of the agglomerates of nanoparticles in polymers in the actual industrial application process, so that the copolymerized nanocomposite material and its preparation method can realize industrial application.

The invention proposes a method for preparing and using a highly dispersed copper-zinc catalyst for carbon dioxide reduction. The method first synthesizes copper oxide nanoparticle precursors with uniform particle size, and then prepares copper oxide composite nanomaterials coated with ZIF-8 MOFs through liquid phase synthesis, and obtains nitrogen-doped carbon skeleton-coated composite nanomaterials after temperature-programmed calcination. Highly dispersed copper zinc catalyst. The feature of the present invention is that the method adds copper oxide nanoparticles in the process of preparing MOFs material ZIF-8, so that the copper oxide nanoparticles are evenly loaded in MOFs in situ, and the highly dispersed carbon skeleton coating is obtained after high-temperature calcination. At the same time as zinc, the reduction and redispersion of copper are also realized, and there are also a large amount of pyridine nitrogen in the carbon skeleton. A new preparation technology for highly dispersed copper-zinc catalysts supported by pyridine nitrogen doped carbon skeletons has been developed, and the The catalyst is used in the hydrogenation reduction reaction of carbon dioxide to prepare carbon monoxide, and has excellent catalytic activity. The highly dispersed copper-zinc active sites and the presence of a large amount of pyridinic nitrogen can greatly promote the improvement of catalytic activity.

The invention discloses a biodegradable polymer composite with high thermal conductivity. The biodegradable polymer composite comprises heat-conducting nanofiller and a biodegradable polymer with a shape memory characteristic, wherein the heat-conducting nanofiller is arranged in the biodegradable polymer in order. The heat-conducting nanofiller without chemical modification is mixed with the biodegradable polymer, by use of the shape memory characteristic of the polymer, the heat-conducting nanofiller is arranged in order by stretch induced self-assembly, meanwhile, the heat-conducting nanofiller arranged in order is used as a physical crosslinking site to maintain the orientation state of the material, after the obtained material is heated secondarily, the filler still keeps high orientation, a constructed orientated structure facilitates lap joint of an ordered filler network with a small quantity of heat-conducting nanofiller, so that the production cost is reduced, the material density is reduced, the strength and ductility of the material are enhanced, and the thermal conductivity of the material is improved.