505 results about "Hydrogen bonded network" patented technology

The invention discloses a self-repairing polymer electrolyte, a preparation method and application thereof, and a polymer lithium battery, the self-repairing polymer electrolyte comprises the following preparation raw materials by mass: 50-100 parts of polysiloxane diacrylate, 1-10 parts of disulfide diacrylate, 10-40 parts of a cross-linking agent, 60-120 parts of a plasticizer, 60-120 parts of a lithium salt, and 1-10 parts of a photoinitiator. According to the self-repairing polymer electrolyte disclosed by the invention, a thiol-ene click reaction can be carried out between carbon-carbon double bonds in polysiloxane diacrylate and disulfide diacrylate and sulfydryl of the cross-linking agent, so that a dynamic disulfide bond and hydrogen bond network structure is endowed to the self-repairing polymer electrolyte; and the dynamic disulfide bond and the hydrogen bond can enable the electrolyte membrane to realize self-healing at room temperature without external stimulation.

The invention provides a preparation method of a self-repairing waterborne polyurethane coating based on a synergistic effect of a dynamic disulfide bond and a pH response microcapsule. The preparation method comprises the following steps: step 1, preparing a dynamic disulfide bond-containing waterborne polyurethane (D-WPU) emulsion; step 2, preparing a pH response microcapsule; step 3, preparing a self-repairing waterborne polyurethane coating; a dynamic disulfide bond of the self-repairing waterborne polyurethane coating rapidly repairs macrocracks at 50-60 DEG C through mercaptan catalysis, and pH < lt > is caused by local corrosion of a pH response microcapsule; when the pH value is 4.0, cysteine is released, sulfydryl accelerates recombination of dynamic bonds, and amino enhances cohesive force of the coating and neutralizes H < + >. And in combination with a hydrogen bond network of the nanocellulose, the coating has low-temperature repair (the mechanical strength recovery rate is greater than or equal to 90%), high toughness (the water absorption rate is less than or equal to 2.1%) and long-acting corrosion resistance (the salt spray resistance life is greater than or equal to 600 hours), and is suitable for severe environments such as ocean engineering and new energy equipment.

The invention discloses a compound containing a urea structure as well as a preparation method and application of the compound in a color developing agent, and relates to the technical field of color developing agents. The compound containing the urea structure is a # imgabs0 # structure as shown in a formula 1. The compound containing the urea structure is synthesized through multiple steps of Suzuki reaction, bromination reaction and substitution reaction. The compound is used as an electron donor to be applied to a thermosensitive color development system and forms a color development composition with a phenolic compound and an acidic material, and the activation temperature is as low as 60-120 DEG C. The ureido structure stabilizes a reaction intermediate through a hydrogen bond network, enhances the electron transfer efficiency, and significantly improves the color developing sensitivity; the aryl / heteroaryl substituent optimizes the color contrast through the conjugation effect, and meanwhile, the synergistic effect of the hot-melt filler ensures the stability of the system. Compared with a traditional color developing agent, the color developing agent has the advantages of low-temperature activation, high color developing intensity and excellent weather resistance, is suitable for the fields of thermal printing, anti-counterfeiting materials and the like, and overcomes the defects of high reaction temperature and insufficient stability in the prior art.

The invention provides a preparation method of a high-adhesion transparent self-healing super-smooth coating. Polydimethylsiloxane is taken as a matrix, a three-arm type dynamic hydrogen bond network structure is constructed, and 2-ureido-4-pyrimidone (UPy unit) is taken as a crosslinking node to be connected with a siloxane main chain, so that the crosslinking density and the interface binding energy are remarkably improved. According to the invention, a UPy unit is innovatively introduced into a main chain or a side chain to construct two topological structures of (SUP) 2TD or (MUP) 2TD. Compared with (MUP) 2TD, the (SUP) 2TD shows excellent tensile property and self-healing property in both air and underwater environments. The enhancement of this performance is attributed to the improvement of chain displacement capability in (SUP) 2TD. Through interface dynamics, a UPy unit is guided to an interface and interacts with an interface group, and a very strong adhesion effect is obtained. In addition, the coating shows excellent self-healing performance.

The invention belongs to the field of flexible electronic devices, and discloses a preparation method of a high-performance strain sensor based on a nano-silver nano-cellulose seepage network. According to the hydrogel, polyvinyl alcohol is used as a matrix, a seepage network formed by polydopamine anchored nano-silver / nano-cellulose PCNF is used as a conductive phase, glycerin is used as an anti-freezing humectant, and through the synergistic effect of a three-dimensional seepage conductive network and a dynamic hydrogen bond network, the defects that traditional hydrogel is poor in sensing stability, poor in environmental stability and low in mechanical strength are overcome. The preparation process is simple, the conductive hydrogel is high in tensile strength, high in sensitivity and good in cycling stability and has an antibacterial function, and an assembled strain sensor can monitor a human motion signal in real time and is suitable for the fields of wearable equipment, electronic skin and medical monitoring in an extreme environment. Through material system and process innovation, integration of high performance and multiple functions is achieved, and wide application prospects are achieved.

The invention provides a perovskite solar cell, a preparation method thereof and a photovoltaic module. The perovskite solar cell comprises a first electrode, a hole transport layer, a perovskite layer, an electron transport layer and a second electrode which are stacked in sequence. The material of the hole transport layer comprises a biomolecular material which is fixed on a self-assembly monomolecular layer material through an intermolecular force, and the biomolecular material comprises one or more of guanine, adenine, thymine, uracil, cytosine, hydroxymethylcytosine, xanthine, hypoxanthine, 6-mercaptopurine and corrin. According to the perovskite cell provided by the invention, the biomolecular material with a plurality of nitrogen heterocyclic structures and amino groups is added to generate multipoint hydrogen-bond interaction and pi-pi accumulation with the tail end of the SAM, so that the orderliness of molecular arrangement is improved, and the dipole direction and strength of the whole interface are regulated and controlled; and a coordination bond or hydrogen bond network is formed by the coordination compound and uncoordinated cations or anions in perovskite, so that interface defects are effectively passivated, and the thermal stability and the humid and hot life of a device are enhanced.

The invention provides a hole transport layer precursor solution, a hole transport layer, a preparation method and application of the hole transport layer, and a perovskite cell, and belongs to the technical field of hole transport layers. The hole transport layer precursor solution comprises a self-assembled single molecule and an organic solvent; the organic solvent comprises a solvent A, a solvent B and a solvent C; the solvent A comprises more than one of a phosphate ester solvent and an alcohol ether solvent; the solvent A contains four hydrogen bond receptors; the boiling point of the solvent A is 215-290 DEG C; the solvent B comprises more than one of ethanol, isopropanol, normal propyl alcohol, butanol, ethylene glycol and N, N-dimethylformamide; the solvent C comprises more than one of ethyl acetate and normal hexane. A ternary hydrogen bond network is formed through the solvent A, the solvent B and the solvent C, the agglomeration degree of SAM molecules is remarkably reduced, and the device performance is improved.

The invention relates to the technical field of polymer composite materials, and discloses a refining treatment method of a bamboo fiber ultra-nano micro powder and natural polymer blended material, which comprises the following steps: (a) premixing bamboo fiber ultra-nano micro powder and a deep eutectic solvent to obtain a premix and realize in-situ activation; (b) adding the premix and a natural polymer matrix from a main feed port of a double-screw extruder; and (c) in the melt blending process, adding a dynamic interface locking agent through a side feeding port arranged at the downstream of the main feeding port, and then extruding and granulating. A staged dynamic compatibilization process is adopted, a hydrogen bond network of bamboo fibers is destroyed by using a deep eutectic solvent to promote shearing dispersion of the bamboo fibers in the front section, and stable interface bonding is constructed in the rear section through a dynamic interface locking agent after dispersion is completed. The method synergistically solves the conflict between dispersion and interfacial compatibilization, so that the composite material has good comprehensive performance.

The invention discloses an aqueous zinc ion battery electrolyte as well as a preparation method and application thereof, and belongs to the technical field of zinc ion batteries. The vanadic acid additive takes a Zn-sulfonated hydrogen bond organic framework as a carrier, and 4-6wt% of vanadate is loaded on the surface of the carrier. Sulfonic acid groups contained in the carrier can cooperate with vanadate to preferentially adsorb free water molecules in an aqueous electrolyte, the erosion activity of the water molecules on the positive electrode material is reduced, a hydrogen bond network structure of the hydrogen bond organic framework can selectively intercept active water molecules, and the water molecules are prevented from participating in oxidation reduction dissolution of the vanadium-based positive electrode material. Meanwhile, the zinc metal ions doped in the carrier can cooperate with the strong polarity of the sulfonic group, regulate and control the solvation structure, reduce the interface impedance and inhibit the growth of zinc dendrites, so that the long-term stability of the aqueous zinc ion battery is improved, and the aqueous zinc ion battery electrolyte capable of inhibiting the dissolution of a positive electrode and stabilizing a zinc negative electrode is obtained.

The invention belongs to the technical field of automotive coatings, and particularly relates to finishing-free water-based plain finish paint and a preparation method thereof. The water-based blocked isocyanate and the water-based hydroxyl acrylate are crosslinked to form a carbamate bond and construct a three-dimensional hydrogen bond network, so that the mechanical strength, the sagging resistance and the chemical resistance of the finish paint are remarkably improved; amino resin is modified through dialdehyde lignin, hydrophilic groups in the amino resin are eliminated, reversible imine bonds are generated, and the acid-base hydrolysis resistance of the finish paint is enhanced; the polyether-polysiloxane is grafted with the water-based blocked isocyanate, so that the storage stability of the finish paint is ensured, the sagging phenomenon of a vertical surface is inhibited, the surface tension of the finish paint is reduced, orange peel is eliminated, and the integrated performance improvement of high weather resistance, sagging resistance and low orange peel of the finish paint is realized.

The invention discloses a preparation method and application of a sulfonylurea structure thermosensitive color developing agent, and relates to the technical field of color developing agents. The core of the thermosensitive color developing agent is a # imgabs0 # compound in a formula 1 containing a sulfonylurea structure. The preparation method comprises the following three steps: synthesizing an intermediate 1 through esterification of raw materials, obtaining an intermediate 2 through boric acidification, and synthesizing a target compound through Suzuki reaction. Through the synergistic effect of sulfonyl and ureido, hydrogen bond network regulation and electron transfer efficiency optimization are realized, and the technical bottlenecks of high-temperature activation requirements and insufficient color development stability of a traditional thermosensitive color developing agent are solved.

The invention belongs to the technical field of membrane separation, and particularly relates to a preparation method and application of a high-permeability polyamide reverse osmosis membrane. According to the invention, the problems of high energy consumption and poor water production quality caused by non-ideal flux and rejection rate of the current reverse osmosis membrane product are solved, tetrabutylammonium bromide and acyl chloride form ion pairs to reduce hydrophobicity, a hydrogen bond network of urea destroys a hydrophobic barrier of an organic phase, and migration of acyl chloride to a water phase interface is promoted; the eutectic solvent is adsorbed on a water phase interface to form a'catalytic microenvironment ', amido of an amine monomer is attracted to be close to the interface, and the concentration of a reaction area is increased. During reaction, tetrabutylammonium bromide enables an amine monomer to stably attack a transition state of acyl chloride through electrostatic interaction, and reaction activation energy is reduced; urea and sodium hydroxide in a water phase can be jointly used as an acid-binding agent to neutralize generated hydrochloric acid so as to prevent amido protonation inactivation. The method is simple to operate and suitable for large-scale production.

The application belongs to the technical field of deep eutectic solvents, and particularly relates to a ternary deep eutectic solvent and preparation and application thereof. The ternary deep eutectic solvent is composed of choline chloride, 5-sulfosalicylic acid and gamma valerolactone according to a molar ratio of 1:4:(3-25). The strong hydrogen bond network structure between the green solvent system first destroys the ester bond between lignin and hemicellulose, then cuts off the beta-O-4 bond between lignin molecules, so as to separate lignin. Meanwhile, the deep eutectic solvent can improve the stability of carbon cations due to the conjugation effect between the lone pair electrons on the heteroatom oxygen and the central carbon in the molecular structure of gamma valerolactone, so as to inhibit the condensation reaction of lignin.

The invention discloses a method for improving moso bamboo cellulase hydrolysis conversion efficiency through amino acid-based deep eutectic solvent pretreatment, and belongs to the technical field of biomass recycling. The method comprises the following steps: mixing an L-cysteine solid and a formic acid solution, performing water bath heating to prepare an acidic eutectic solvent, performing microwave-assisted eutectic solvent pretreatment on moso bamboos, and performing filtration separation and enzymolysis; wherein the molar ratio of the L-cysteine to the formic acid is 1: (4-5). A deep eutectic solvent formed by formic acid and cysteine has a strong hydrogen bond network and an acid environment, beta-O-4 ether bonds in lignin are promoted to be broken, sulfydryl of cysteine participates in nucleophilic attack, a lignin-carbohydrate complex is further destroyed, formic acid can hydrolyze acetyl and glucosidic bonds in hemicellulose, and the lignin-carbohydrate complex is further destroyed. And degrading into an oligomer or monosaccharide. The phyllostachys pubescens components are efficiently separated, the cellulose enzymolysis saccharification capacity is improved, and effective utilization of all the phyllostachys pubescens components is facilitated.

The invention provides a high-safety flexible pole piece, a preparation method and a flexible lithium ion battery, the pole piece comprises a current collector and a coating arranged on the surface of the current collector, the coating comprises a flexible isolation structure and a plurality of electrode units, the flexible isolation structure constructs a plurality of accommodating areas isolated from each other on the surface of the current collector, the number of the electrode units is multiple, and the flexible isolation structure is arranged in the accommodating areas. The plurality of electrode units are respectively and independently arranged in different accommodating areas. According to the invention, accurate prevention and control of thermal runaway are realized through the electrode structure design of partition isolation and a material system with multiple hydrogen bonds synergistic effect. The electrode is divided into independent units by the flexible isolation structure, so that heat spreading is effectively blocked; and a hydrogen bond network formed by the hydroxyl-containing comonomer I, PI, PET and hexaphenoxy cyclotriphosphazene significantly enhances the interface stability and flame retardant efficiency of the electrode and the isolation structure, and improves the intrinsic safety of the battery while ensuring the flexibility of the battery.

The invention discloses a polyether polyurethane solid polymer, a preparation method thereof and application of the polyether polyurethane solid polymer in a solid electrolyte, and belongs to the technical field of polymer electrolytes and preparation of the polymer electrolytes. The problems that an existing solid polymer electrolyte is low in ionic conductivity and poor in interface stability are solved. According to the invention, polyether amine and cyclic carbonate are subjected to an in-situ polymerization reaction to synthesize a series of polyether polyurethane solid polymer electrolytes with different molecular weights and monomer proportions. The obtained polyether polyurethane solid polymer electrolyte contains rich carbamate groups, hydroxyl groups, fluorine ions and the like, and can form a strong reversible hydrogen bond network, so that the electrolyte has excellent mechanical properties, can be used as a self-supporting electrolyte membrane, and does not need an additional diaphragm. Meanwhile, a large number of dynamic reversible hydrogen bonds also enable the solid polymer electrolyte to have excellent self-healing ability, and can be self-repaired when the battery is damaged by external force in the operation process, so that the structural stability of the solid polymer electrolyte is remarkably improved.

The invention relates to the technical field of electrochemical energy storage materials, and discloses a gel polyelectrolyte, a preparation method and application and an aqueous zinc metal battery. The electrolyte is of a micron-sized micropore three-dimensional internet porous structure, and the three-dimensional internet porous structure is formed by copolymerization of polymer monomers; the polymer monomers are acrylamide and zinc 2-acrylamide-2-methylpropanesulfonate, the acrylamide provides a hydrophilic amide group, the hydrophilic amide group and a sulfonate group in the zinc 2-acrylamide-2-methylpropanesulfonate form a dynamic hydrogen bond network, the sulfonate group is covalently anchored to a polymer main chain, and the polymer main chain is covalently anchored to form a dynamic hydrogen bond network. And a main carrier Zn < + > is coordinated with-O-and-N-atoms on a polymer chain. According to the invention, salt-free single ion conduction is realized, concentration polarization is inhibited by sulfonate covalent anchoring, a dynamic hydrogen bond network provides excellent water-retaining property, the problem of moisture evaporation of traditional gel is solved, the interface stability is enhanced by coordination of Zn < + > and a polymer chain, the dendritic crystal inhibition effect is remarkable, and the ion transference number is far greater than that of traditional double-ion electrolyte.

The invention relates to the technical field of high polymer materials, in particular to a corrosion-resistant cable sheath material and a preparation method thereof. The sheath material is prepared by taking an ethylene-octylene copolymer as a matrix and compounding functional fillers such as an aminated magnesium ion exchange A type molecular sieve, dopamine shell silicon dioxide nanoparticles and phenylboronic acid / octadecyl double-grafted silicon dioxide nanoparticles. Wherein the aminated Mg-A molecular sieve is used for efficiently capturing and fixing chloride ions through an ion-dipole effect and a hydrogen bond network; the dopamine shell layer silicon dioxide enhances the interface bonding strength through dual active groups of catechol and amido; phenylboronic acid / octadecyl double-grafted silicon dioxide constructs a dynamic boric acid ester cross-linked network and a hydrophobic barrier, and synergistic protection of crack self-healing and moisture barrier is achieved. The sheath material remarkably improves the long-term corrosion resistance and mechanical stability of the cable in a severe environment.

The invention discloses a blue-light perovskite light-emitting diode based on a hydrogen bond network and a preparation method thereof, 3-(5-fluoropyridine-2-yl) acrylic acid hydrochloride molecules are added into a perovskite precursor solution, non-radiative recombination is reduced by passivating defects, and the molecules cooperate with ligands and octahedrons to construct the hydrogen bond network in the crystallization process, so that the blue-light perovskite light-emitting diode based on the hydrogen bond network is obtained. The stability of the octahedral framework is enhanced, ion migration is effectively inhibited, the high-efficiency and high-stability blue-light PeLED is finally obtained, and the external quantum efficiency and the operation stability of the blue-light PeLED are remarkably improved.

The invention belongs to the technical field of dynamic simulation, and discloses a construction method of a molecular dynamic model for different bubble contents of ice and methane hydrate, and the method comprises the following specific steps: 1, selecting a crystal structure of the ice and methane hydrate as a model basis for initial structure construction; by constructing a molecular dynamic model of an ice and methane hydrate coexistence system, the problem of extensive quantitative regulation and control of bubble content is solved, accurate association of microscopic molecule removal and macroscopic volume fraction is realized, force field parameter suitability of a cross-phase interface is optimized, interaction of a hydrogen bond network and molecules at an ice and methane hydrate interface is accurately described, and the method has the advantages of simple operation and low cost. The simulation precision of the molecular diffusion behavior and the structural stability of the interface area is improved, meanwhile, the bubble form diversity and the temperature and pressure coupling environment are comprehensively considered, a multi-dimensional experimental verification system is established, and the influences of different bubble contents on the thermodynamic property, the dynamic behavior and the mechanical property of the system can be systematically evaluated.

The invention discloses high-toughness self-repairing polyurethane based on a ureido / disulfide bond dual dynamic network and a preparation method of the high-toughness self-repairing polyurethane, and belongs to the technical field of self-repairing high polymer materials. The structural formula of the thermal stimulation repairing polyurethane is shown in the specification. The polyurethane is formed by mixing and polycondensing polyether amine, diaminodiphenyl disulfide and dicyclohexylmethane diisocyanate. According to the invention, polyether amine is used as a raw material, green synthesis without a catalyst is realized, ureido generated by the reaction forms a hydrogen bond network with extremely strong dynamic property and cooperates with a disulfide bond, a repair process is completed at 50 DEG C, the toughness can reach 40.55 MJ / m < 3 >, the fast recovery capability is realized, the material can be stretched to be 20 times of the original length, and the service life of the material is prolonged. Good network dynamic property is achieved at the room temperature, and high self-repairing efficiency is achieved at the room temperature.

The invention relates to the technical field of microcapsule preparation, and particularly discloses a microcapsule composition with a slow release function and a preparation method and application of the microcapsule composition. Soybean protein provided by the invention is subjected to three-stage hydrolysis to generate small molecule peptide and amino acid, and the small molecule peptide and amino acid can be interwoven with maltodextrin in a network structure; therefore, a compact and coherent composite wall material network structure is jointly constructed, erosion of gastric acid can be effectively resisted, and physical isolation protection is provided for probiotics. When the microcapsule enters an environment from neutral to alkalescent intestinal tracts, the pH value in the intestinal tracts is increased, and an original hydrogen bond network structure among molecules is damaged, so that an original compact gel network structure becomes loose and is greatly swelled; meanwhile, the hydrolyzed soybean protein can be further hydrolyzed under the action of intestinal trypsin and the like, the wall material structure of the microcapsule is gradually loosened, thalli are gradually released in the swelling-disintegration process, targeted slow release of the intestinal tract is achieved, and therefore the probiotic function of the microcapsule is achieved.

The invention relates to the technical field of medical biological materials, and discloses a preparation method of a medical dressing for sterilization and hemostasis, and the method comprises the following steps: preparing a solution A containing a cationic polymer; dissolving anionic polysaccharide, plant polyphenol and a divalent cation source in water, and adjusting the pH value to 4.5-6.0 to prepare a solution B; the solution A and the solution B are mixed to form a liquid precursor, and after the precursor is in contact with a physiological pH environment, the pH value of the precursor rises to trigger in-situ gelation. The gelation is quickly completed by electrostatic attraction among the cationic polymer, anionic polysaccharide and plant polyphenol, coordination cross-linking among divalent cations and the polymers and a hydrogen bond network synergistic effect. The dressing prepared by the invention can be quickly gelated in situ, is tightly attached to a wound surface, has the dual functions of efficient sterilization and hemostasis, and can be removed as required without damage through an unlocking liquid containing a chelating agent.

The invention discloses an anti-aging polyurethane adhesive based on a polyurethane synthesis technology and a preparation method, and relates to the related field of adhesives, a UPy reversible polymer is introduced into an anti-aging polyurethane adhesive system, a dynamic quadruple hydrogen bond network can be constructed in a molecular structure, and the anti-aging polyurethane adhesive is prepared. The adhesive has excellent self-repairing capability and environmental adaptability, the structure can rapidly dissociate, recombine and repair microscopic cracks when subjected to ultraviolet, thermal oxidation or mechanical damage, the aging process is effectively delayed, the service life of the material is prolonged, the reliability of the material is improved, meanwhile, the UPy structure enhances the intermolecular acting force, the bonding strength and toughness are remarkably improved, and the service life of the adhesive is prolonged. And the adhesive layer is prevented from brittle rupture and falling.

The invention discloses a recoverable high-enthalpy-value solid-solid phase change material and a preparation method thereof. Solid phase constraint of a liquid phase change material is achieved through a topological entanglement effect generated by a hydrogen bond network and polymer macromolecules. The coupling effect of the two limits the movement between low-molecular-weight phase change material molecules at the phase change temperature, and high-temperature solid-solid phase transformation is achieved. The solid-solid phase change material prepared by the method has a high enthalpy value and also has recoverability. In addition, due to the excellent light absorption capacity of the graphene oxide sheet, the graphene oxide sheet has a potential excellent function in the aspect of solar photo-thermal conversion.

This invention discloses a cross-linked copolymer coating for negative electrodes, its preparation method, and its application, relating to the field of solid-state battery negative electrode protection technology. The coating is formed by in-situ copolymerization of a precursor composition consisting of carbonate monomers with unsaturated double bonds, hydroxyl-rich natural polymer derivatives, lithium salts, and an initiator. The rigid cellulose skeleton in the copolymer regulates the degree of polymerization of the carbonate monomers through a hydrogen bond network, forming a protective layer with a rigid-flexible block structure, resulting in a uniform and dense SEI film. The hydrogen bond anchoring effect of high-density hydroxyl and carbonyl groups inhibits polycarbonate segment degradation and improves interfacial chemical stability. The three-dimensional hydrogen bond network endows the coating with excellent mechanical strength and flexibility, synergistically buffering volume changes and inhibiting lithium dendrite growth. This preparation process is simple and controllable, effectively reducing the probability of battery short circuits and improving safety performance and cycle stability.

This application relates to the field of veterinary drug technology, and discloses a transdermal absorption-enhancing ointment and its preparation process. The ointment components include white petrolatum, anhydrous lanolin, caprylic / capric triglycerides, hydrophobic fumed silica, and a highly fluid active permeation-enhancing phase. The permeation-enhancing phase contains active drugs and soybean lecithin, which self-assemble to form an inverse micelle aggregate. Soybean lecithin cross-links with the silanol groups on the surface of silica to form an intermolecular hydrogen bond network, constructing a sterically hindered framework within a continuous lipid matrix to prevent the polar drug-loaded phase from permeating and separating upon heating. Simultaneously, the inverse micelle structure effectively improves the transdermal absorption rate of the drug. The preparation process controls the lipid crystallization kinetics through slow cooling under negative pressure and micro-shear dynamic rheology. This invention solves the problems of easy precipitation upon heating, low transdermal efficiency, and poor rheological properties in traditional ointments, resulting in a product with a stable physical structure and good pseudoplastic texture.

The invention discloses a transparent polyurethane elastomer as well as a preparation method and application thereof, and the preparation method comprises the following steps: reacting diisocyanate with polyester polyol under the action of a catalyst to generate an isocyanato-terminated polyurethane prepolymer; and reacting the polyurethane prepolymer with 2, 2 '-dithiobis (acethydrazide) in a first solvent, evaporating the first solvent, and curing to generate the transparent polyurethane elastomer. Through multiple synergistic effects of increasing molecular entanglement, inhibiting hard phase aggregation, promoting supramolecular network crosslinking, a compact hydrogen bond network and a high-hardness hard domain, the polyurethane elastomer has excellent mechanical strength and toughness and has certain self-repairing performance.

The invention relates to the field of lubrication of ball screws, in particular to long-life creep-resistant lubricating grease for a high-precision ball screw, which comprises the following components in parts by weight: 65 parts of polyolefin, 5-10 parts of pentaerythritol ester, 5-10 parts of isocyanate, 2-5 parts of amine chain extender, 5 parts of PTFE (polytetrafluoroethylene), 1.0-1.5 parts of diphenylamine, 0.1-0.5 part of 2, 4-diphenyl-1, 3-pentanediol monoisobutyrate, 0.1-0.5 part of antioxidant, 0.1-0.5 part of antioxidant and 0.1-0.5 part of lubricant. The composite material is prepared from the following components in parts by weight: 0.5 to 1 part of 2, 6-butylated hydroxytoluene, 1.5 to 2 parts of molybdenum isocaprylate, 0.5 to 1 part of molybdenum bis (2-ethylhexyl) dithiocarbamate, 1 to 2 parts of zinc dialkyl dithiophosphate, 3 parts of calcium petroleum sulfonate, 1 to 1.5 parts of polyisobutene, 0.2 to 0.5 part of benzotriazole and 0.1 to 0.3 part of polymethacrylate. The isocyanate comprises HDI and IPDI, and the amine chain extender comprises TETA and TEPA. According to the invention, isocyanate and the amine chain extender react to form a polyurea macromolecular chain, and a high-energy hydrogen bond network is formed, so that the lubricating grease has relatively high creep resistance; the anti-creep performance is further enhanced through cooperation with the PTFE particles; meanwhile, through cooperation with diphenylamine, the oxidation resistance is promoted, the consumption is reduced, and the service life of the lubricating grease is longer.

The present application relates to the technical field of concrete admixtures, in particular to a shrinkage-reducing admixture for concrete, a preparation method and application thereof.The preparation process of the present application overcomes the problems of poor alkali resistance of traditional admixtures and easy cracking of solidified concrete.The present application comprises the following steps: preparing a reducing initiator, a chain transfer agent, an unsaturated acid monomer, a shrinkage-reducing functional monomer and an amide functional monomer solution by step-by-step preparation, controlling the polymerization conditions under nitrogen protection, and obtaining a water reducing agent; using alkyl glycoside as a starter, step-by-step polymerizing propylene oxide and ethylene oxide to obtain a low-foaming polyether; mixing the water reducing agent and the low-foaming polyether with an alkali-resistant additive to obtain a shrinkage-reducing admixture; and significantly improving the water-reducing rate, flow retention and compressive strength of concrete, optimizing the setting time, reducing the dry shrinkage rate and the influence of alkali erosion, and improving the compactness and durability of concrete through hydrogen bond network, low surface tension and alkali resistance protection.The viscosity of the concrete admixture is moderate, which is suitable for concrete application, and the process is stable and easy to industrialize.