20results about How to "Reduce hydrogen bonding" patented technology

The invention discloses a preparation method of plateau fibrillated Lyocell fibers, and belongs to the technical field of cellulose fiber preparation. The preparation method comprises the following steps: step SS1: adding propyl gallate, a crystallization promoting agent and a delustering agent into a solvent NMMO with the mass concentration of 65 + / -5%, and stirring and dispersing to obtain a mixture A; step SS2, adding wood pulp into the mixture A, and stirring to obtain a mixture B; step SS3, heating the mixture B, and carrying out reduced pressure evaporation dehydration until the cellulose is completely dissolved, so as to obtain a spinning solution with the cellulose concentration of 7-11wt%; and step SS4, extruding the spinning solution from the spinneret plate, cooling in a coagulating bath, drafting and forming to obtain the plateau fibrillated Lyocell fiber. According to the preparation method of the plateau fibrillated Lyocell fiber, the technical problems that plateau fibrillated fabric is tedious in processing flow, long in processing time, serious in scratching and large in influence on fabric quality are effectively solved.

The invention discloses a methyl modified hydrogel electrolyte, a preparation method thereof and application of the methyl modified hydrogel electrolyte in a zinc battery, and belongs to the field of secondary batteries. The hydrogel electrolyte is composed of acrylamide, methyl cellulose and zinc sulfate. The preparation method comprises the following steps: adding methyl cellulose and acrylamide into a zinc sulfate solution, uniformly mixing, then adding a potassium persulfate initiator and a cross-linking agent N, N '-methylene bisacrylamide, finally putting into a double-layer glass plate, sealing, and carrying out thermal polymerization. The methyl cellulose has zinc affinity and can convert an acrylamide proton polymer into an aprotic polymer to weaken intermolecular hydrogen bonds, so that free hydrogen bond receptors are released to participate in cationic solvation. The solubilization and recrystallization strategy can effectively adjust the gel electrolyte environment, cut off hydrogen bonds formed by binding water donors and participate in electrolyte salt dissolution, so that the electrolyte concentration is increased, and salting-out of the electrolyte is inhibited. When the gel electrolyte is applied to the zinc battery, zinc ion migration can be accelerated, and excellent cycle performance under a low-temperature condition is realized.

The invention discloses a thick oil emulsifying viscosity reducer composition which comprises alkyl amide propyl hydroxy sulfobetaine, a quaternary ammonium salt compound containing tertiary amine and hydroxyl and water, and the content of the alkyl amide propyl hydroxy sulfobetaine is 10%-40%, preferably 25%-30%, the content of the quaternary ammonium salt compound containing tertiary amine and hydroxyl is 10%-40%, preferably 25%-30%, and the content of the quaternary ammonium salt compound containing tertiary amine and hydroxyl is 10%-40%. 3%-15%, preferably 8%-10%, of a quaternary ammonium salt compound containing tertiary amine and hydroxyl. The thick oil emulsifying viscosity reducer with strong foaming performance provided by the invention can emulsify thick oil to form an oil-in-water emulsion, so that the viscosity of the thick oil is obviously reduced, and the fluidity of the thick oil is improved; and the viscosity reducer has good foaming performance and foam stabilizing performance, can effectively block high-permeability pore channels, reduces the water channeling degree, and improves the sweep efficiency of the viscosity reducer, thereby improving the recovery rate of heavy oil.

The invention relates to the technical field of chemical stabilizers, in particular to a transparent environment-friendly calcium-zinc heat stabilizer and a preparation method thereof.The transparent environment-friendly calcium-zinc heat stabilizer is prepared from, by weight, 10-25 parts of calcium salt, 10-25 parts of zinc salt, 6-8 parts of modified hydrotalcite, 4-6 parts of lubricant, 2-4 parts of antioxidant, 2-4 parts of ultraviolet light absorber and 2-4 parts of modified epoxidized soybean oil. The transparent environment-friendly calcium-zinc heat stabilizer prepared by the method has excellent heat resistance and stability.

The present invention discloses a modified cement slurry composite additive for mining and its preparation method and application, which relates to the field of mining grouting materials and is applied to the reinforcement and management of rock mass fissures in mines. The modified cement slurry composite additive for mining includes the following components by weight: 2-4 parts of modified water reducer, 4-6 parts of bentonite, 1-2 parts of polyaluminum sulfate, 0.5-1 parts of polyaluminum chloride, 4-6 parts of calcium sulfate, 0.5-0.7 parts of hydroxypropyl methylcellulose, 0.6-0.8 parts of modified microcapsules, and 25-35 parts of water. The synthesized modified water reducer includes polysiloxane chains and phenylalanine, has high thermal stability and has both water reduction and mud resistance, and improves the high temperature resistance and compressive strength of cement grouting materials prepared using the composite additive. The dispersibility, thermal stability and UV resistance of the modified polypropylene used in the synthesized modified microcapsules are improved, which enhances the self-healing ability of the cracks of the cement grouting materials prepared using the modified microcapsules.

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 discloses modified starch based on graft copolymerization, a preparation method and application in PBAT, and relates to the technical field of high polymer material modification, and the preparation method of the modified starch comprises the following steps: S1, gelatinizing starch; s2, adding the gelatinized starch in the S1 into a premixed solution of butenoyl chloride, triaminobenzyl alcohol and triethylamine, then adding an initiator for reaction, and after the reaction, precipitating, washing and drying to obtain grafted starch; and S3, blending the grafted starch in S2 with a composite plasticizer, uniformly mixing, and carrying out melt extrusion to obtain the modified starch. The starch and the grafting monomer are subjected to copolymerization reaction, an additional chain structure is introduced, the hydroxyl content on the surface of the starch is reduced, and the hydrophobicity is improved. The introduced chain structure has amido and ester functional groups which can generate new hydrogen-bond interaction with hydroxyl on the main chain of starch molecules, so that the plasticizing efficiency of the starch is improved, and the mechanical and thermal properties of the composite material are enhanced.

The invention discloses a polycaprolactone polyol modified acrylic emulsion, a preparation method thereof and a coating, and relates to the field of acrylic emulsion synthesis and coating research and development, the preparation method comprises the steps of preparing a branched monomer, preparing polycaprolactone polyol modified acrylic resin, and preparing the polycaprolactone polyol modified acrylic emulsion. According to the preparation method, the problem that the water resistance and medium resistance of resin are reduced due to direct introduction of polycaprolactone is solved, the prepared polycaprolactone polyol modified acrylic emulsion has a branched structure, the branched center is a polycaprolactone polyol unit, and the unit contains a large number of methylene groups and polyester bonds, so that the water resistance and medium resistance of the resin are improved. The emulsion can reduce the hydrogen-bond interaction between molecules, so that when the emulsion is used for coating preparation, the flexibility and impact resistance of a coating can be improved, the obtained coating has high elasticity and good wear resistance, and due to the fact that a main esterification group is located in a branched center, the stability of the coating is improved. Therefore, the coating prepared from the emulsion has good hydrolysis resistance and chemical resistance.

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.

The invention relates to a wear-resistant spraying-free PP material, and belongs to the technical field of spraying-free plastics. According to the invention, the modified surfactant is combined with the color master batch, so that the color master batch can be better dispersed and combined in the polymer while having oxidation resistance. By adding the plant nanofibers, the material is more wear-resistant, and the plant nanofibers are treated by the ionic liquid, so that the dispersity and compatibility of the plant nanofibers in a polymer are improved. The PP material provided by the invention has excellent wear resistance and good surface aesthetic property, does not need additional spraying treatment, realizes excellent mechanical properties and environmental friendliness through fine material proportioning and process optimization, and has good processability and stable color distribution at the same time.

The invention discloses a preparation method of aldehyde cellulose nanoparticles with high dispersion stability, which comprises the following steps: mixing cellulose nanocrystals with sodium periodate and zinc chloride to react in an acetic acid / sodium acetate buffer solution system with the reaction temperature of 40-45 DEG C and the pH value range of 3-4; and adjusting the reaction time to obtain the aldehyde cellulose nanoparticles with controllable size and high dispersion stability. The aldehyde cellulose nanoparticles obtained by the invention have excellent dispersion stability in water and a polar organic solvent, and the redispersion stability after freeze drying is obviously improved compared with the redispersion stability before modification.

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 present invention discloses a phosphorylated microcrystalline cellulose-modified molybdenum disulfide aerogel material and a preparation method and application thereof. The preparation method comprises the following steps: S1. adding phosphorylated cellulose and molybdenum disulfide nanosheets into an ionic liquid and mixing to obtain a mixture; S2. adding a cross-linking agent polyethyleneimine to react to obtain a hydrogel, removing impurities and freeze-drying to obtain a phosphorylated microcrystalline cellulose-modified molybdenum disulfide aerogel material. The present invention uses polyethyleneimine to form a stable gel network structure by cross-linking phosphorylated cellulose and molybdenum disulfide nanosheets, thereby achieving uniform dispersion and stabilization of molybdenum disulfide in the material; and polyethyleneimine contains many amino groups that are beneficial to the adsorption of organic matter, which can effectively improve the adsorption performance of the material. The aerogel material has a simple preparation process, can adjust the shape according to different working conditions, has the characteristics of high adsorption capacity, green environmental protection, and recyclability, and has good application prospects in dye wastewater treatment.

The invention discloses a method for improving the redispersion efficiency of nanofiber drying, and belongs to the field of nanofiber drying. The method for improving the redispersion efficiency of nanofiber drying provided by the invention comprises the following steps: (1) subjecting a nanocellulose / nano-chitin dispersion to drying treatment; (2) subjecting the dispersion to water swelling for 0.5h-12h; (3) finally subjecting the dispersion to redispersion treatment to obtain a stable nanocellulose / nano-chitin dispersion with high redispersion efficiency. Sodium lignin sulfonate can also be added to the nanofiber dispersion in step (1) to further improve the redispersion efficiency of the nanocellulose after drying. The redispersion nanofiber dispersion prepared by the invention has good stability, can maintain the transparency of the nanofiber dispersion before drying and the nanometer size of the nanofiber, and can improve the suspension stability of the fracturing fluid. The method of the invention is simple, easy to operate, and low in cost, and can reduce the storage and transportation costs of the nanofibers, which is conducive to the large-scale industrial application of the nanofibers.

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

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.

The invention provides lipidosome with sodium lauroyl lactylate as a substrate and a preparation method of the lipidosome, and belongs to the technical field of cosmetics. The liposome is prepared from the following components in percentage by weight: 5 to 20 percent of sodium lauroyl lactylate, 1 to 10 percent of cholesterol lauroyl glutamate, 15 to 25 percent of polyhydric alcohol, 1 to 5 percent of surfactant, 1 to 5 percent of auxiliary oil phase agent, 1 to 10 percent of active matter and the balance of buffer solution. The sodium lauroyl lactylate is used as a substrate, hydrogen bonds and hydrophobic interaction between proteins are reduced through interaction between lactoyl groups in the structure of the sodium lauroyl lactylate and the proteins in the cuticle of the skin, so that the viscosity of the cuticle is reduced, the permeability of the skin is improved, the sodium lauroyl lactylate is matched with the cholesteryl lauroyl glutamate, the lipid compatibility is improved, and the skin care effect is improved. Active matters in the skin care product can be promoted to more effectively permeate into the deep layer of the skin, so that the permeation efficiency of the active matters is improved.

The present invention relates to the technical field of polymer materials, and specifically to a block copolymer modified para-aramid polymer solution and a preparation method and application thereof, wherein the preparation method comprises: dissolving a solubilizing salt into an organic solvent under an inert gas atmosphere to obtain the polymer solution; adding a third monomer and terephthaloyl chloride to the polymer solution, controlling the reaction temperature to perform a pre-condensation reaction, and obtaining an amino-terminated oligomer system; adding p-phenylenediamine and terephthaloyl chloride to the oligomer system, and controlling the stirring reaction temperature to perform a block copolymerization reaction under stirring conditions; after the block copolymerization reaction is completed, adding a neutralizer to neutralize the acidic substances generated during the reaction, and finally obtaining a modified para-aramid polymer solution in a neutral environment. The polymer solution is applied to the field of lithium battery separators to obtain a modified aramid coated separator with excellent heat shrinkage performance, high film breaking temperature, porous structure, and high puncture resistance.