22results about How to "Enhanced hydrogen bonding" patented technology

The invention discloses a water-soluble phosphonated polybenzimidazole polymer and a preparation method thereof, and particularly, under the protection of nitrogen flow, 3, 3 '-diaminobenzidine and diphosphonic acid substituted aromatic dicarboxylic acid react for 6-30 hours at 180-250 DEG C by taking polyphosphoric acid as a medium, and the phosphonated polybenzimidazole polymer is obtained through polycondensation. The phosphonated polybenzimidazole polymer disclosed by the invention has good solubility in water under an alkaline condition, can be used as a solvent in subsequent processing, has the characteristics of no pollution and environmental protection, is easy to recover and has a wide application prospect.

The invention belongs to the technical field of high polymer materials, and particularly relates to a graphene nano composite material and a preparation method thereof. The graphene nano composite material is prepared from the following components: graphite powder, APTES (Aminopropyltriethoxysilane), polyvinyl alcohol, nano TiO2, polyethylene glycol dihydric alcohol, trimethylolpropane and isocyanate. The specific preparation steps of the graphene nano composite material are as follows: S1: preparation of graphene oxide; s2, introducing an amino silane group into the graphene oxide; s3, grafting polyvinyl alcohol and nano titanium dioxide; s4, carrying out in-situ polymerization grafting on the modified graphene oxide and polyurethane polyol to obtain a graphene nano composite material; according to the preparation method, the dispersity of graphene in a polyurethane matrix is enhanced through APTES functionalization and PVA grafting, and agglomeration is prevented; the APTES and the polyurethane form a covalent bond, so that the interface bonding is enhanced; pVA increases steric hindrance and improves toughness; tiO2 nanoparticles are stably dispersed, so that the impact resistance and the tensile strength are improved.

The invention discloses a method for delaying aging and retrogradation of refrigerated rice by combining a cooking-prior-to-steaming process with a magnetic field, and belongs to the technical field of food processing. The method comprises the following steps; treating the raw materials, boiling, steaming, and refrigerating with assistance of a magnetic field. According to the method, a certain amount of starch is washed away through a cooking process, water is promoted to permeate into rice grains to participate in starch gelatinization, finished rice with fluffy rice grains and tender taste is obtained through a steaming process, and the retrogradation and rearrangement process of rice starch molecules in the refrigeration process is delayed through magnetic field assisted refrigeration. The cooking and steaming process is combined with the magnetic field to assist refrigeration for cooperative treatment, and aging and retrogradation of the rice in the refrigeration process can be effectively delayed. The method disclosed by the invention is simple in process, and the prepared rice has lower retrogradation degree under the same storage condition, and has the advantages of low hardness, good viscosity, better taste quality and longer shelf life.

The invention discloses a nano-particle type thick oil viscosity reducer as well as a preparation method and application thereof, and belongs to the technical field of thick oil chemical additives. The preparation method comprises the following steps: dissolving 1 part of anhydrous citric acid, 2-2.7 parts of benzylamine and 0.3-1 part of octadecylamine in an ethanol solution according to a molar ratio, and uniformly stirring; then putting the mixture into a reaction kettle to react at a constant temperature of 180 DEG C, and cooling to obtain a crude product; and concentrating, dialyzing and purifying the crude product, and drying to obtain the nano-particle type thick oil viscosity reducer. According to the thick oil viscosity reducer, a polymer with a good viscosity reduction effect is formed through molecular design, and due to the fact that the molecular weight of the polymer is small, the polymer is in a nano-particle form on the microscopic scale, and based on the surface effect and the high specific surface area of nano-particles, the polymer has good dispersing performance and infiltration capacity; the nanometer effect further promotes the functional groups in the viscosity reducer molecules to depolymerize asphaltene aggregates in the thickened oil, and the viscosity reducer shows a good viscosity reduction effect. And the process is simple and easy to control, does not use toxic solvents, and is very environment-friendly.

The present application discloses a nanoparticle type heavy oil viscosity reducer and its preparation method and application, which belongs to the technical field of heavy oil chemical additives. The preparation method is to take 1 part of anhydrous citric acid, 2 to 2.7 parts of benzylamine and 0.3 to 1 part of octadecylamine in molar ratio, dissolve them in ethanol solution, and stir them evenly; then put them into a reactor for constant temperature reaction at 180°C, and obtain a crude product after cooling; the crude product is concentrated and purified by dialysis, and the nanoparticle type heavy oil viscosity reducer is obtained after drying. The heavy oil viscosity reducer provided by the present application forms a polymer with good viscosity reduction effect through molecular design, and due to its small molecular weight, it presents a nanoparticle form at the microscopic level. Based on the surface effect and high specific surface area of ​​nanoparticles, it has good dispersibility and penetration ability; the nano effect further promotes the depolymerization of asphaltene aggregates in heavy oil by the functional groups in the viscosity reducer molecules, showing a good viscosity reduction effect. And the process is simple and easy to control, does not use toxic solvents, and is very environmentally friendly.

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 veneer-based laminated flame-retardant tough material and a preparation method and application thereof.The preparation method comprises the following steps that hydroxyl-containing inorganic flame-retardant particles are immersed in an aromatic dicarboxylic acid solution to obtain modified flame-retardant particles, the modified flame-retardant particles and ammonium polyphosphate are added into a sodium alginate solution to be mixed to be uniform, and the veneer-based laminated flame-retardant tough material is obtained. Pre-polymerization liquid is obtained; and S2, immersing delignified balsa wood veneers into the pre-polymerization liquid obtained in the step S1, stacking the balsa wood veneers layer by layer, immersing the balsa wood veneers into a calcium ion solution, and drying the balsa wood veneers after polymerization to form the veneer-based laminated flame-retardant tough material. According to the invention, ammonium polyphosphate is used as a flame-retardant material, delignification treatment is carried out on cork wood, carboxylic acid modification is carried out on hydroxyl-containing inorganic flame-retardant particles, and polymerization is carried out on sodium alginate and calcium ions, so that the material with excellent flame-retardant property and high mechanical strength is prepared.

The invention discloses an organosilicone marine antifouling paint with self-adhesion property, which is prepared by the following steps: sequentially carrying out free radical copolymerization and carboxyl and amido reaction through a two-step method to obtain a modified polysiloxane copolymer; and blending the modified polysiloxane copolymer with hydrophobic polysiloxane resin, and carrying out a cross-linking reaction to obtain the organosilicone marine antifouling paint. A large number of dynamic covalent bonds and non-covalent bonds introduced through acrylamide and acrylic acid structures interact to realize hydrogen-bond interaction, high acidity of carboxyl ensures that the hydrogen-bond interaction is more obvious, reduction of hydrogen-bond strength caused by secondary electrostatic repulsion is effectively eliminated, and meanwhile, extra high-density hydrogen-bond sites are realized through introduction of a catechol structure, so that the preparation method is simple and convenient. And the hydrogen-bond interaction is further strengthened to enhance the autohension of the coating. The prepared coating has an excellent bonding effect on various substrates, and meanwhile, the surface of the cured coating prepared by blending and crosslinking is still enriched with a flexible methyl siloxane structure with low surface free energy, so that the coating still keeps an excellent antifouling effect.

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.

The present invention belongs to the technical field of functional polymer materials and waterborne polyurethane coating preparation, and discloses a highly wear-resistant single-component waterborne polyurethane and its emulsion or dispersion, and a preparation method and application of a coating. The present invention catalyzes a polyol, a small molecule diol, a catalyst and a diisocyanate, adds a crosslinking agent with a ditriazine structure to react, neutralizes, emulsifies and disperses to obtain a waterborne polyurethane emulsion or dispersion, and obtains a coating after coating and drying. The present invention introduces a ditriazine structure into the waterborne polyurethane, thereby improving the crosslinking degree of the polyurethane and the hydrogen bonding effect between molecules, giving the coating excellent wear resistance, hardness and mechanical properties, being easy to use, and having high cost performance, and having a wide range of uses in automobiles, electronic appliances, chemicals, leather finishing, engineering machinery, construction and other related fields.

The present invention belongs to the technical field of intelligent new materials, and discloses a strong and transparent polyvinyl alcohol composite hydrogel and a preparation method thereof; the preparation method is: dispersing polyvinyl alcohol in water, stirring and heating to ≥90°C to obtain solution A; dispersing cellulose nanofibers in water to obtain solution B; mixing solution A and solution B and then irradiating to obtain a hydrogel matrix; annealing the hydrogel matrix and immersing it in water for soaking, and taking it out after the soaking is completed, so as to obtain a strong and transparent polyvinyl alcohol composite hydrogel. The present invention improves the crystallinity and greatly improves the tensile strength and toughness of the hydrogel by annealing on the basis of radiation cross-linking of polyvinyl alcohol. The preparation process is simple to operate and can be used as a candidate material for tissue engineering such as artificial joint cartilage.

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.

The invention discloses a polypropylene carbonate-based composite film and a preparation method thereof, and belongs to the field of packaging film material preparation. The composite film based on polypropylene carbonate comprises a PBAT heat sealing layer, a modified PPC layer and a PLA layer, the PBAT heat sealing layer and the modified PPC layer are bonded through a first bonding layer, and the modified PPC layer and the PLA layer are bonded through a second bonding layer. By optimizing the preparation raw materials of the PBAT heat sealing layer, the first bonding layer, the modified PPC layer, the second bonding layer and the PLA layer and the ratio of the preparation raw materials, the compatibility among the raw materials is increased, the overall high barrier property, thermal stability and mechanical property are shown, and the composite film is biodegradable, can be well applied to the field of environment-friendly functional packaging materials and has wide application prospects. The market use requirements are met.

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 a heat-resistant PVC (polyvinyl chloride) pneumatic membrane and a preparation method thereof, and relates to the field of PVC materials, and the heat-resistant PVC pneumatic membrane comprises the following raw materials in parts by weight: 80-120 parts of PVC; 10 to 20 parts of modified aluminum hydroxide; 10 to 30 parts of ABS resin; 2-6 parts of a stabilizer; the aluminum hydroxide is prepared from the following raw materials: corn fiber, distilled water, absolute ethyl alcohol, stearic acid, starch, glycerol and aluminum hydroxide. The heat-resistant PVC pneumatic membrane has the advantage that heat resistance of the PVC pneumatic membrane is improved.

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 invention relates to the technical field of synthetic leather composite materials, and particularly discloses a preparation method of a glass fiber prepreg and PU composite material, which comprises the following steps: pre-impregnating a dopamine / boron nitride modified glass fiber cloth with polyurethane synthesized by polybutylene adipate glycol, polypropylene oxide glycol and diphenylmethane diisocyanate as a resin matrix; the prepreg is filled with fillers such as silicon dioxide modified titanium dioxide, the composite material formed by hot-pressing and compounding the prepreg and the PU synthetic leather is excellent in performance, a hot melt adhesive film is not needed in the forming process, the technological process is simplified, the production efficiency is improved, errors caused by manual lamination are reduced, the percent of pass is improved, and the production cost is saved.

The invention discloses an electromagnetic shielding material and a preparation method and application thereof.The preparation method comprises the steps that firstly, a cotton fabric is placed in a saturated NaOH solution of bivalent copper salt to be subjected to an impregnation reaction, and a modified cotton fabric is prepared; and washing and drying the modified cotton fabric, and carbonizing to obtain the electromagnetic shielding material. The method is simple in process and reasonable in design, the electromagnetic shielding material with excellent performance can be obtained only through simple dipping and carbonization treatment, the method is suitable for industrial expanded application, and meanwhile the product has good electromagnetic shielding effectiveness based on the copper elementary substance and the carbonaceous material.

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.

The invention discloses a fluid loss additive for drilling fluid and a preparation method thereof, and relates to the technical field of fluid loss reduction of drilling fluid. The invention relates to a filtrate reducer for drilling fluid. Comprising the following components in percentage by weight: 7%-15% of acrylamide, 4%-8% of 2-acrylamide-2-methylpropanesulfonic acid, 4%-8% of N-vinyl pyrrolidone, 2%-6% of acryloyloxyethyl trimethyl ammonium chloride, 0.8%-1.6% of a phenolic aldehyde composite cross-linking agent, 0.2%-0.8% of a zircon salt cross-linking agent, 0.1%-0.6% of an initiator, 0.3%-0.9% of an emulsifier and the balance of water. 3%-8% of hybrid zirconium diboride whiskers, 6%-16% of polyvinyl alcohol and the balance of water. The filtrate reducer disclosed by the invention can be firmly adsorbed with clay particles, shows good high-temperature and high-salt resistance and filtrate reduction performance, can resist the temperature up to 220 DEG C, can resist NaCl to be saturated, can resist Mg < 2 + > up to 20000 mg / L or above, and can resist Ca < 2 + > up to 40000 mg / L or above.