8results about How to "Enhanced 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.

The invention discloses a preparation method of inositol nicotinate tablets, and belongs to the technical field of pharmaceutical preparations. By optimizing the existing process and coating components, stable dissolution of drugs is realized, and the method comprises the following steps: dispersing inositol nicotinate in mixed oil to prepare an oil phase, mixing and emulsifying the oil phase and a water phase, performing spray drying to obtain drug milk powder, coating the drug milk powder with modified chitosan, and directly tabletting the coated drug milk powder and auxiliary materials. The preparation method comprises the following steps: uniformly dispersing inositol nicotinate in mixed oil to promote the inositol nicotinate to maintain the uniformity of the drug content in the subsequent process, and adsorbing solid particles on the surfaces of drug-containing oil drops through an emulsification technology to protect the drug components; coating components are reasonably designed, so that fixed-point release of the medicine is realized, the medicine is endowed with anti-pressure ability, and the medicine can be directly tableted; and the coated medicine particles are mixed with auxiliary materials and then are directly tableted, so that the process is simplified, and the coating structure of the medicine particles is protected at the same time. The preparation method can prepare the inositol nicotinate tablet with stable drug dissolution, and the inositol nicotinate tablet is good in taste and small in stimulation to gastric mucosa.

This invention discloses a surfactant composition, its preparation method, and its applications. The surfactant composition comprises a nonionic surfactant, an amphoteric surfactant, and optionally an anionic nonionic surfactant; wherein the nonionic surfactant is selected from at least one nonionic compound containing a hydrophobic hydrocarbon chain and two or more hydroxyl groups. The surfactant composition of this invention forms a bicontinuous phase structure through self-assembly, which is interconnected in all directions, thereby providing excellent mass transport properties and achieving rapid wetting. The use of a mixture of a polyhydroxy nonionic surfactant and an amphoteric surfactant enhances hydrogen bonding with water and the anions in the amphoteric surfactant, while the hydrophobic hydrocarbon chain enhances van der Waals forces, increasing the viscoelasticity of the coating under wetting conditions and thus enhancing its resistance to prolonged water misting.

This invention relates to the field of fertilizer technology and discloses a biomass fertilizer for improving the soil environment and its preparation method. The invention uses lignin graft copolymer and modified sodium alginate as raw materials, and prepares a composite hydrogel using the calcium ion in-situ gelation method. Biochar, urea, and potassium dihydrogen phosphate are then added to the hydrogel to obtain a biomass fertilizer for improving the soil environment. The pyrrole groups in the lignin graft copolymer and the nitrogen atoms in the Mannich base structure act as hydrogen bond acceptors, enhancing the hydrogen bonding with the hydrogel molecular chains and improving the water retention capacity of the fertilizer. The rigid structure of lignin itself also plays a role in the gel network, reducing the collapse of the cross-linked network, thereby forming a richer three-dimensional porous structure and enhancing the water retention capacity of the fertilizer. Quaternary ammonium salt groups can disrupt the bacterial cell membrane structure, leading to the extravasation of bacterial substances and enhancing the antibacterial effect of the fertilizer. Thiourea groups can bind to enzymes within bacterial cells, exerting an antibacterial effect.

The invention discloses an adsorption material with adjustable aperture, a preparation method, an RTO pretreatment device and an RTO pretreatment process, and belongs to the technical field of waste gas treatment, the adsorption material takes a hydrophobic porous adsorption material as a matrix, and the surface of the matrix is coated with a layer of MOFs filter membrane. Furthermore, in the adsorption material, the matrix is a hydrophobic Y molecular sieve, and the MOFs filter membrane is MILs. According to the method, the pore size of the MILs porous membrane is controlled by utilizing humidity and temperature, so that the adsorption capacity of the hydrophobic Y molecular sieve under different concentrations is controlled, a peak-reducing and thickening RTO pretreatment process is provided by utilizing the adsorption material with the adjustable pore size, and stable and safe operation of an RTO device is ensured.

The application belongs to the field of engineering technology and provides a preparation method of a nucleic acid separation device. The preparation method of the application prepares a hydrogel nucleic acid adsorption device through a photo-initiated radical polymerization reaction, avoiding the cumbersome limitations of traditional polymerization reactions which need to be carried out under anaerobic conditions. The preparation method is simple and fast, and does not depend on professional and precise instruments. The raw materials are cheap and easy to obtain. The method can efficiently load silica particles, effectively combine the plasticity of the hydrogel with the high specific surface area of the silica particles and the strong binding capacity of the nucleic acid, and further obtain a handheld nucleic acid extraction device which can change shape, size and quantity at any time according to application requirements, has a high specific surface area and excellent nucleic acid extraction performance. Compared with traditional processes, the preparation process is simpler, the application range is wider, and the application requirements of low resource environment are greatly met, and the application prospect in the field of outdoor and clinical nucleic acid extraction technology is broad.

The application discloses a kind of polylactic acid-based polyurethane and its preparation method and application, the polyurethane is with polyester polyol and L-lactide ring-opening polymerization to obtain diblock prepolymer, again with dicyclohexyl methane diisocyanate reaction and be prepared multi-block polyurethane;Wherein, the polyester polyol is PriplastTM 3238.The polyurethane body of the application has superior mechanical properties and excellent hydrophobic capacity, has excellent bonding performance after being used as adhesive and can be maintained bonding ability underwater.Solve the contradiction that existing polyurethane adhesive pollutes environment, the mechanical properties and adhesion of body cannot be taken into account, effectively prolong the service period of adhesive, make it show great application potential in many fields.

The present application relates to papermaking technical field, specifically to a kind of impact-resistant composite high-strength kraft paper and its preparation method, including the following raw materials: modified coniferous wood pulp fiber, modified core-shell structure styrene-butadiene latex, modified composite starch reinforcing agent, broadleaf wood pulp, waste paper pulp, retention aid, sizing agent, filler;Modified coniferous wood pulp fiber in the present application improves the single fiber strength, inter-fiber bonding force and wet-state water breaking tenacity;Modified core-shell structure styrene-butadiene latex enhances the interfacial adhesion between latex and fiber and the cohesive strength and water resistance of latex itself;Modified composite starch reinforcing agent improves the permeability, film strength and water resistance of starch glue solution;Three kinds of modified materials in paper sheet are synergized by multilevel chemical bonding and physical crosslinking of fiber, latex and starch, which promotes the interlaminar bonding strength, dynamic impact resistance and structural stability in high-humidity environment of kraft paper.