6results about How to "Reduce hydrogen bonding" patented technology

This invention discloses an acid-triggered hydrogel plugging agent and its preparation method, comprising polyacrylamide, carboxylated tannic acid, and slow-release iron, wherein the mass ratio of polyacrylamide, carboxylated tannic acid, and slow-release iron is 10:0.03-0.06:0.005-0.01. This invention solves the problems of existing gel plugging agents being unable to remain stable in acidic environments for extended periods and being difficult to inject.

This invention relates to the field of transfer paper coating technology, specifically to a thermal sublimation transfer paper coating and its preparation method. The invention first coats a photothermal dual-curing polyurethane emulsion onto a substrate paper, curing it to form a hydrophobic layer. The photothermal dual-curing polyurethane emulsion is composed of an epoxy-terminated silicone polyurethane modified with hydroxyl-terminated polydimethylsiloxane and capped with propylene glycol diglycidyl ester, and a double-bond capped polyurethane obtained by chain extension with glycerol monoglycidyl ether and capping with hydroxyethyl acrylate. Next, an ink-absorbing coating containing mercapto-modified silica, acrylamide monomer, and sodium carboxymethyl cellulose is coated onto the hydrophobic layer, cross-linking to form an ink-absorbing layer. Finally, a polyvinyl alcohol solution is coated onto the ink-absorbing layer to form a surface layer. The thermal sublimation transfer paper coating designed by this invention exhibits strong adhesion and excellent transfer effect.

The invention provides a preparation method and application of a citric acid modified Cd-MOF material, and belongs to the technical field of metal organic framework materials. The citric acid modified beta-cyclodextrin metal organic framework (CA-beta-CD-MOF) is synthesized by adopting a chemical grafting and steam diffusion method, and the adsorption performance and the reusability of the citric acid modified beta-cyclodextrin metal organic framework (CA-beta-CD-MOF) are systematically researched. Parameters such as concentration, dosage, pH and the like of citric acid are associated, the adsorption effect of the citric acid on heavy elements in a portable solution is investigated, and the adsorption capacities of the citric acid on anionic dye Congo red (CR) and heavy metal ions (Cu < 2 + >) are as high as 900.9 and 287.4 mg.g <-1 > respectively. The citric acid modified beta-cyclodextrin metal organic framework (CA-beta-CD-MOF) obtained by the invention has the characteristics of being simple, green, environment-friendly and reusable, has excellent adsorption performance, and can be used for simultaneously removing organic dye and heavy metal ion pollution in water.

This invention proposes a method for preparing cobalt tetroxide and its application, relating to the field of battery materials technology. The preparation method includes the following steps: S1: preparing a base solution with a pH of 7.5-9.0, heating it, adding a cobalt source and an alkali for a first-stage reaction to obtain a mixed slurry; S2: adding hydrogen peroxide to the mixed slurry for a second-stage reaction, adjusting the pH to 9.5-11 after addition, and aging to obtain a cobalt tetroxide slurry; in step S1, the Co in the cobalt source... 2+ With the OH provided by the base ‑ The molar ratio is (0.52~0.68):1; in step S2, the hydrogen peroxide reacts with the Co in the cobalt source. 2+ Molar ratio: n(H2O2):n(Co) 2+ The ratio of cobalt oxide to cobalt tetroxide is 0.3-0.38:1. This invention prepares cobalt tetroxide in one step using a wet co-precipitation method by precisely controlling reaction parameters. The resulting product has characteristics such as high purity cobalt tetroxide phase, high BET concentration, and good dispersibility.

The application discloses a kind of aramid fiber beating pretreatment method, belong to aramid pulp preparation technical field.The application utilizes CaCl2 solution to aramid fiber pretreatment, obtains CaCl2 modified aramid fiber, then again through silane coupling agent ethanol solution treatment obtains pretreated aramid short fiber.The application utilizes CaCl2 solution to treat aramid fiber, both to aramid fiber has etching effect, improves specific surface area, while complexed Ca 2+ , weaken the hydrogen bond interaction between aramid molecules, thereby reducing beating time and energy consumption.CaCl2 solution to aramid fiber treatment both removes most of the oil agent on the surface of aramid fiber, and also plays a swelling effect on the fiber, saves the step of soaking the fiber before beating.After surface grafting by silane coupling agent, the active sites of aramid fiber are increased, so that the aramid pulp obtained by beating is more easily compounded with rubber matrix.

The application belongs to the technical field of polymer material transparent nylon, and discloses a preparation method of optical-grade transparent bio-based nylon 510 polymer. The preparation method comprises the following steps: mixing nylon 510 salt, a catalyst, an antioxidant, an imidazole ionic liquid and a solvent, and then sequentially performing pre-polymerization and melt polymerization, and then performing low-temperature treatment to obtain the optical-grade transparent bio-based nylon. The optical-grade transparent bio-based nylon 510 polymer prepared by the method has a light transmittance of 85-90%, and a tensile strength of 65-70 MPa, and has excellent mechanical strength and high transparency.