5results about How to "Keep hydrophilic" patented technology

The application discloses a preparation method of a graphene / hexagonal boron nitride heterojunction. The target substrate is subjected to cleaning treatment, and then the surface of the cleaned target substrate is changed into hydrophilicity, so that the film can be well laid on the surface of the substrate, and the wrinkles are reduced. A layer of hexagonal boron nitride is arranged on the surface of the hydrophilic target substrate. A layer of PMMA is spin-coated on the surface of the graphene film to be transferred, and then the graphene film is floated in deionized water. Under the surface force of the deionized water, the graphene film can be stretched based on the PMMA. Then, the target substrate with the surface provided with the hexagonal boron nitride is used to be combined with the graphene film with the PMMA layer spin-coated on the surface in the deionized water, so that the target substrate and the graphene film are combined flatly. Then, drying and heating are carried out at a stepped temperature, the distance between the substrate and the sample is shortened, and the crack area is reduced. Finally, through annealing treatment, not only the PMMA residue is reduced, but also the film can be more closely contacted with the substrate.

This invention provides a silicone / polyurethane / epoxy resin composite emulsion, its preparation method, and its application. It is prepared by the following steps: (1) after dehydration of polyethylene glycol and hydroxyl silicone oil, diisocyanate is added, and the mixture is heated to prepare a silicone / polyurethane prepolymer; (2) a hydrophilic chain extender is added to continue the reaction, resulting in a hydrophilic silicone / polyurethane prepolymer; (3) a diluent and epoxy resin are added, and the reaction yields a silicone / polyurethane / epoxy resin composite resin system; (4) a neutralizing agent is added after cooling; (5) water is added under high-speed stirring to form a silicone / polyurethane / epoxy resin composite emulsion; (6) the diluent is removed by vacuum distillation. The silicone / polyurethane / epoxy resin composite emulsion provided by this invention, when combined with a water-based curing agent, can be used to reinforce glass fiber filter media for lubricating oil filtration. The reinforced filter media can meet the requirements of pleating processes and high-temperature lubricating oil applications at 220℃.

The invention provides a method for directionally constructing a micro-nano porous structure between fibers of a fabric so as to enhance the radiation cooling performance of the cotton fabric. In particular to a Janus knitted fabric with radiation refrigeration and one-way moisture conduction functions and a preparation method and application thereof, the front side of the Janus knitted fabric is hydrophilic cotton yarns, and the back side of the Janus knitted fabric is synthetic fibers; after weaving is completed, the reverse side of the Janus knitted fabric is coated with a polymer solution containing inorganic micro-nano particles, and the distance gt of the synthetic fibers is regulated and controlled; the diameter of the inorganic micro-nano particles and the spacing of the synthetic fibers are gt The polymer solution is directionally distributed to the cotton yarn layer due to the spacing of the hydrophilic cotton fibers, and then a micro-nano porous structure is formed among the cotton fibers through non-solvent induced phase separation. According to the Janus knitted fabric prepared by the invention, a micro-nano porous structure is formed in situ between cotton fibers, the surface texture and macrostructure characteristics of the fabric are not influenced, the original hand feeling and hydrophilicity of the fabric are kept, and the Janus knitted fabric has an excellent radiation cooling function.

The application discloses a preparation method of a quaternary ammonium and sulfonated polyether sulfone ultrafiltration membrane, and the preparation method comprises the following steps: 1) sulfonating chloromethylated polyether sulfone by using chlorosulfonic acid as a sulfonating reagent to prepare sulfonated polyether sulfone; 2) preparing sulfonated and chloromethylated polyether sulfone by using 1,4-dichloromethoxy butane as a chloromethylating reagent and concentrated sulfuric acid as a solvent; 3) dissolving the sulfonated and chloromethylated polyether sulfone and a pore-forming agent in a solvent, scraping a film after preparing a casting solution; and 4) immersing the finished membrane in a trimethylamine solution by using trimethylamine as a quaternary ammonium reagent to obtain the quaternary ammonium and sulfonated polyether sulfone ultrafiltration membrane. The prepared ultrafiltration membrane has the advantages of high flux and anti-pollution due to the introduction of quaternary ammonium groups and sulfonated groups.

The application discloses a gradient-wetting Janus ceramic membrane and a preparation method and application thereof. In the preparation, a porous ceramic substrate with hydrophilic double main surfaces is taken, one main surface of the porous ceramic substrate is treated with a solution containing a hydrophobic modifier (without contacting the other main surface), a photocatalyst is loaded on the treated surface, and at least three continuous sub-regions are divided, different-length activation radiation is applied to each sub-region to form a gradient-wetting region with a water contact angle gradually changing along a preset direction, and finally, the photocatalyst is removed and dried. The obtained membrane has an asymmetric structure, one side has precisely regulated gradient-wetting, and the other side remains hydrophilic. When the membrane is applied to scenes such as carbon capture and regeneration of waste heat recovery of gas, the surface wettability of the membrane can be accurately matched with a local thermodynamic and concentration environment along the way, heat and mass transfer can be strengthened, surface self-cleaning can be realized, the performance of the membrane is superior to that of a traditional membrane, and the energy-saving and consumption-reducing potential is great.