5results about How to "Solve the swelling problem" patented technology

The invention discloses a long-time strong-adhesion tissue repair patch and a preparation method thereof, and the preparation method comprises the following steps: adding an adhesion component, an anti-swelling component and alpha-ketoglutaric acid into a colloidal aqueous solution of a patch matrix material to obtain a precursor solution; and pouring the precursor solution into a patch mold, carrying out ultraviolet curing, and drying the obtained gel to obtain the patch. From the selection of materials and chemical bonds, physical and chemical bonds such as amido bonds, disulfide bonds and catechol groups are combined, so that the adhesion strength is improved, the adhesion duration is prolonged, and the adhesive has excellent anti-swelling performance and mechanical performance, can effectively isolate external saliva, food residues and the like when being applied to the oral cavity, reduces infection of ulcer wounds, and has a good application prospect. The dental ulcer healing is accelerated, and the method also has a relatively good application prospect in the field of tissue repair.

The invention belongs to the technical field of hydrogen fuel cells, and particularly relates to a membrane electrode for a hydrogen fuel cell vehicle, a preparation method and application. The fuel cell membrane electrode comprises an anode gas diffusion layer, a catalyst coating proton membrane (CCM), a cathode gas diffusion layer and a sealing frame, the CCM is prepared by taking an ePTFE (expanded polytetrafluoroethylene) membrane with a reticular porous structure as a transfer medium through an indirect transfer printing method. According to the invention, the flexible design of the catalyst coating structure of the catalyst coating proton membrane CCM can be realized, the three-phase reaction interface of the fuel cell can be increased, the efficient transfer of protons in the catalyst layer and the use efficiency of the catalyst can be improved, and the dosage of the noble metal catalyst can be obviously reduced; the problem of swelling of the perfluorosulfonic acid type proton exchange membrane caused by a direct coating method is effectively solved, and the method is suitable for batch production and preparation of fuel cell membrane electrodes.

The present invention discloses a method for preparing a fuel cell membrane electrode catalyst layer, belonging to the field of fuel cell technology. The preparation method firstly mixes a catalyst and resin particles to form a catalyst layer powder, the powder is charged and adsorbed on the surface of a transfer substrate under the action of high voltage electricity, and then transferred to the membrane surface under heating conditions to form a catalyst layer, and finally the catalyst layer is further cured by hot pressing. Compared with the traditional wet method for preparing a fuel cell membrane electrode catalyst layer, the preparation method of the present invention does not use any organic or inorganic solvents, thus avoiding problems such as membrane swelling, environmental pollution, solvent waste and extra energy consumption.

This invention belongs to the field of fuel cell technology, and particularly relates to a catalyst slurry spraying process and a method for preparing a fuel cell CCM. The spraying path includes an interdigitated serpentine path I and a serpentine path II, both of which include straight paths and turning paths. This invention controls the spraying speed and slurry flow rate during the catalyst layer spraying process, employs an interdigitated serpentine path for spraying, and controls the temperature of the drying platform in zones. This makes the spraying speed of the turning path 1.1-2 times faster than that of the straight path, and the flow rate of the turning path is 0.1-0.9 times that of the straight path. A blank area is left between the two sequentially sprayed straight paths to avoid slurry accumulation during the turning path spraying, thus solving the problem of excessively thick catalyst layer at the catalyst layer edge caused by traditional uniform speed / uniform flow rate spraying.

The invention belongs to the field of MOF films, and particularly relates to a continuous MOF film with a three-dimensional grid interface and a preparation method and application of the continuous MOF film. The preparation method comprises the following steps: diffusing a PVA-cobalt ion aqueous solution from the polydimethylsiloxane layer into the base membrane, diffusing a first ligand solution from the non-woven fabric layer into the base membrane to coordinate with cobalt ions, and forming an alpha-Co (OH) 2 grid layer on the surface of the polydimethylsiloxane layer to obtain a membrane with the alpha-Co (OH) 2 grid layer; the film with the alpha-Co (OH) 2 grid layer is soaked in a metal salt solution, metal ions in the metal salt solution are riveted to the alpha-Co (OH) 2 grid layer, the film is taken out and dried, then the film is soaked in a second ligand solution for a reaction, and the continuous MOF film with the three-dimensional grid interface is obtained. According to the preparation method, the problems that different types of continuous defect-free MOF membranes are difficult to prepare on a polymer support body and the interfacial compatibility is poor are solved.