235 results about "Mercaptopropionic acid" patented technology

The invention relates to the field of quantum dot ink, and discloses diffusion plate printing quantum dot ink and a preparation method thereof.The diffusion plate printing quantum dot ink comprises acrylic resin, hyperbranched polyester resin, a quantum dot material, modified boron nitride, a reactive diluent, a photoinitiator, a wetting agent and a defoaming agent; the hyperbranched polyester resin is prepared by reacting hyperbranched polyester acrylate and a sulfydryl-terminated silicon-containing reaction monomer, wherein the hyperbranched polyester acrylate is prepared by reacting pentaerythritol with 2, 2-dimethylolpropionic acid and then carrying out esterification reaction with acrylic acid; the sulfydryl-terminated silicon-containing reaction monomer is prepared by reacting eugenol with 1, 1, 3, 3-tetramethyldisiloxane and then carrying out esterification reaction with 3-mercaptopropionic acid; the modified boron nitride is prepared by modifying a cationic polymer which is prepared by carrying out a Mannich reaction on triethylene tetramine, formaldehyde and acetone and then carrying out a condensation polymerization reaction with formaldehyde. After the ink prepared by the invention is cured, a coating film is high in hardness, adhesive force and heat conductivity coefficient, and good in flexibility, heat resistance and migration barrier property.

A flame-retardant laminated solid wood composite floor and a manufacturing method therefor. The manufacturing method comprising: first reacting dopamine hydrochloride with acryloyl chloride to generate a dopamine acrylamide monomer; by means of a double bond in the dopamine acrylamide monomer, carrying out a click reaction with a phosphate monomer containing a sulfydryl group, so as to introduce a catechol group into a side chain of the phosphate monomer and obtain a flame-retardant monomer containing the double bond; and then mixing pentaerythritol tetra(3-mercaptopropionate), pentaerythritol triacrylate, perfluorodecanethiol and the flame-retardant monomer containing the double bond to obtain a photocurable coating material. The coating material is photocured after being coated on the surface of a wood veneer, thus effectively improving the flame-retardant performance of the wood veneer; moreover, the adhesion between the coating layer and the wood veneer is excellent. The wood veneers are laminated in multiple layers, are glued and assembled into a layered structure, and then hot-pressed to form the solid wood composite floor, thus improving the comprehensive performance.

The invention relates to a hyaluronic acid-polyurethane composite material based on a double dynamic network and a preparation method and application thereof, and the preparation method comprises the following steps: carrying out hydrophobic modification reaction on hyaluronic acid and aminophenylboronic acid to obtain aminophenylboronic acid modified hyaluronic acid; the preparation method comprises the following steps: mixing polytetrahydrofuran ether glycol, polyethylene glycol and isophorone diisocyanate, carrying out a primary reaction, adding trimethylolpropane tri (3-mercaptopropionic acid) ester, carrying out a secondary reaction, adding tannic acid, and carrying out a third reaction to obtain tannic acid-terminated dynamic thionocarbamate polyurethane; and mixing the amino phenylboronic acid modified hyaluronic acid with the tannic acid terminated dynamic thionocarbamate polyurethane for reaction to obtain the hyaluronic acid-polyurethane composite material with the double dynamic networks. Compared with the prior art, by introducing a'thionocarbamate-borate 'double-dynamic network, high toughness, high strength, good self-repairability and repeatable processability in an extreme environment are realized, and the material is particularly suitable for manufacturing and repairing of key components in an LNG ship body and a heat insulation system thereof.

The invention relates to the technical field of polyurethane adhesives, and provides a heat-conducting polyurethane structural adhesive and a preparation and use method thereof.The heat-conducting polyurethane structural adhesive comprises a first component and a second component, and the first component comprises modified bio-based polyol, polythiol, heat-conducting filler, a first water removal agent, a thixotropic agent, a first catalyst and a second catalyst; the second component comprises epoxy resin, diisocyanate, polyisocyanate, a heat-conducting filler, a coupling agent, a second dewatering agent, a dispersing agent and a retarder; the modified bio-based polyol is selected from at least one of modified castor oil polyol, modified grease polyol and modified cashew nut shell oil polyol; the polythiol is selected from at least one of trimethylolpropane tri (3-mercaptopropionic acid ester), pentaerythritol tetra (3-mercaptopropionic acid ester), butanediol mercaptopropionic acid ester and polythiol. Through the arrangement, the heat-conducting polyurethane structural adhesive has relatively long openable time, and is rapidly cured at room temperature within a short time to generate relatively high initial curing strength.

The invention relates to the technical field of waterproof materials, and particularly discloses a high-elasticity waterproof emulsion and a preparation method thereof. The invention discloses a high-elasticity waterproof emulsion. The water-based paint is prepared from the following raw materials in parts by mass: 40 to 60 parts of modified acrylic resin emulsion, 25 to 40 parts of waterborne polyurethane, 3 to 6 parts of hydroxyethyl methylacrylate, 0.5 to 1 part of mercaptopropionic acid, 6 to 8 parts of fluorinated mica sheet, 3 to 6 parts of organic silicon emulsion, 2 to 4 parts of fluorocarbon surfactant, 0.8 to 1.5 parts of adipic dihydrazide, 0.3 to 0.8 part of dynamic cross-linking agent, 3 to 8 parts of compatilizer, 0.5 to 1 part of antioxidant, 0.5 to 1 part of anti-aging agent, 0.5 to 1.5 parts of defoaming agent and 40 to 55 parts of solvent. The modified acrylic resin emulsion is prepared from a monomer comprising diacetone acrylamide. The high-elasticity waterproof emulsion prepared by the invention has relatively good elasticity, waterproof performance and aging resistance.

The invention relates to the technical field of vacuum bag films for aeronautical manufacturing, and discloses an eleven-layer co-extruded film for aeronautical use and a preparation process thereof, and the preparation process specifically comprises the following steps: carrying out grafting modification treatment on polyamide acid by using a monoalkenyl diepoxy composite flexible compound through a carboxyl-epoxy ring-opening reaction to prepare alkenyl functionalized processable polyimide; the preparation method comprises the following steps: carrying out modification treatment on nylon 6 resin by using 3-mercaptopropionic acid through an amino-carboxyl condensation reaction to prepare mercapto functionalized nylon; under the hot melting condition, alkenyl functionalized processable polyimide and sulfydryl functionalized nylon are induced to be subjected to reactive compounding through a free radical initiator, PA-PI alloy master batch is prepared, the master batch serves as a functional modification component of copolymerized polyamide 6 / 66 resin, an eleven-layer co-extrusion film is prepared through an eleven-layer co-extrusion blow molding process, and the eleven-layer co-extrusion film is used as a functional modification component of the copolymerized polyamide 6 / 66 resin. The film product has excellent comprehensive performance and can be used as a high-temperature-resistant vacuum bag film for curing aviation composite materials.

The invention discloses a super-retarding type polycarboxylic acid water reducing agent and a preparation method and application thereof, and belongs to the field of concrete water reducing agents. The preparation method comprises the following steps: taking acrylic acid AA, isobutenol polyoxyethylene ether HPEG and hydroxyethyl acrylate HEA as monomers, taking mercaptopropionic acid MPA as a chain transfer agent, taking hydrogen peroxide H2O2 and L-ascorbic acid Vc, and mixing in proportion to serve as an initiator; preparing a first and second monomer mixed solution; adding bottom water into the reaction kettle, and carrying out stepwise polymerization reaction; and cooling the reaction liquid, adjusting the pH value, filtering, and discharging to obtain the product. According to the invention, an ester functional monomer hydroxyethyl acrylate HEA is introduced, and a step-by-step polymerization technology is adopted to control the dispersion process of water reducing agent molecules on cement particles, so that the water reducing agent molecules continuously disperse the cement particles within a certain period of time; the problem that the slump loss is too fast due to long-time and long-distance transportation of concrete or transportation in high-temperature weather is effectively relieved.

The invention relates to the technical field of building, chemical engineering and energy heat preservation, and discloses a silicon-based aerogel composite material and a preparation method and application thereof. The invention relates to a light-emitting diode (LED) photo-curing agent, which is prepared from tetraethyl orthosilicate, methyltrimethoxysilane, allyltriethoxysilane, pentaerythritol tetra (3-mercaptopropionate), N-(3-(triethoxysilyl) propyl) furfuryl amine, N-(3-(triethoxysilyl) propyl) maleimide, a photoacid generator and a photoinitiator. The composite material has a three-dimensional porous silicon dioxide network skeleton and a polymer interpenetrating network, the three-dimensional porous silicon dioxide network skeleton is formed by copolymerization of tetraethyl orthosilicate and methyltrimethoxysilane, and the polymer interpenetrating network is formed by reaction of pentaerythritol tetra (3-mercaptopropionate) and allyltriethoxysilane. The preparation method comprises the steps of sol preparation, light curing, solvent replacement, surface hydrophobic modification and normal-pressure drying. The material shows excellent thermal insulation and mechanical properties in the fields of building heat insulation, pipeline heat preservation and cryogenic heat insulation.

The invention belongs to the field of intelligent materials, and discloses a nematic phase liquid crystal elastomer fiber and a method for optimizing the thermal shrinkage performance of the nematic phase liquid crystal elastomer fiber. According to the method, the mass ratio of a cross-linking agent pentaerythritol tetra (3-mercaptopropionate) (PETMP) to a chain extender 2, 2 '-[1, 2-ethanediyl bis (oxygen)] bis (ethanethiol) (EDDET) in an LCE spinning solution is accurately controlled through a wet spinning technology, and drafting and heat treatment processes are combined, so that the LCE fiber with adjustable and controllable heat shrinkage performance and mechanical performance is prepared. The invention aims to overcome the limitations of low response speed, low shrinkage rate, insufficient environmental stability and the like of the existing LCE fiber. The reversible thermal shrinkage rate of the fiber can reach up to 35%, the maximum shrinkage deformation can be completed within 2 seconds at the soonest at the temperature of 80 DEG C, and the maximum tensile strength can reach 170 MPa. And the catalyst has excellent oxidation stability (the mass retention rate is about 97%), and can maintain efficient thermal response in a water environment. And a new way is provided for development of high-performance intelligent materials.

The invention relates to the field of inorganic material preparation, and particularly discloses pseudo-boehmite and a preparation method thereof. A preparation method of pseudo-boehmite comprises the following steps: (1) mixing an aluminum salt solution and an aluminate solution, adding a crystal form regulating agent, and stirring for reaction to obtain a sol system; the crystal form regulating agent is ZnS quantum dots modified by thiohydracrylic acid; (2) adding a pore diameter guiding agent into the sol system, and aging for 6-8 hours; the pore diameter guiding agent is a compound of a polyethylene glycol-polypropylene glycol-polyethylene glycol triblock copolymer and sodium citrate; and (3) carrying out solid-liquid separation on the aged sol system, and washing and drying the obtained solid to obtain the pseudo-boehmite. The proportion of 5-10nm pores of the pseudo-boehmite prepared by the preparation method disclosed by the invention reaches 90% or above, so that the pore distribution requirement of a fine catalytic reaction on the pseudo-boehmite can be met, and the efficient catalytic reaction is favorably realized.

The invention discloses a self-repairing composite floor for a clean room and a preparation method of the self-repairing composite floor, and the preparation method comprises the following steps: carrying out amination treatment on nano silicon dioxide and carbon quantum dots by using a silane coupling agent, and sulfonating polyethersulfone ketone by using concentrated sulfuric acid; the preparation method comprises the following steps: carrying out curing treatment on epoxy resin, an amine curing agent, N-hydroxyethyl maleimide and tetrakis (3-mercaptopropionic acid) pentaerythritol ester to obtain epoxy-mercaptan resin; the preparation method comprises the following steps: carrying out prepolymerization reaction on vacuum dehydrated polyester polyol, tetrahydroxyethyl ethylenediamine, furanpropanol, diisocyanate, a catalyst, 2, 2 '-thiodiethanol and hydroxyl silicone oil to obtain a star-shaped polyurethane prepolymer, adding epoxy-thiol resin, glyceryl borate, sulfonated polyethersulfone ketone, aminated silicon dioxide, aminated carbon quantum dots and an auxiliary agent, carrying out ultrasonic treatment, and carrying out drying to obtain the star-shaped polyurethane resin. The self-repairing coating material is obtained; and coating the self-repairing coating material on the surface of a base plate, and performing hot-pressing curing molding to obtain the self-repairing composite floor for the clean room.

This application relates to the field of polyurethane adhesive technology, and provides a thermally conductive polyurethane structural adhesive and its preparation and application methods. The thermally conductive polyurethane structural adhesive includes a first component and a second component. The first component includes a modified bio-based polyol, a polythiol, a thermally conductive filler, a first dehydrating agent, a thixotropic agent, a first catalyst, and a second catalyst. The second component includes an epoxy resin, a diisocyanate, a polyisocyanate, a thermally conductive filler, a coupling agent, a second dehydrating agent, a dispersant, and a retarder. The modified bio-based polyol is selected from at least one of modified castor oil polyol, modified oil polyol, and modified cashew nut shell oil polyol. The polythiol is selected from at least one of trimethylolpropane tris(3-mercaptopropionate), pentaerythritol tetra(3-mercaptopropionate), butanediol mercaptopropionate, and polythiol. This configuration allows the thermally conductive polyurethane structural adhesive to have a longer open time and to rapidly cure at room temperature in a short time, resulting in high initial strength.

The present invention relates to improved cellulose nanocrystal fillers for rubber compositions, and more particularly to the grafting of disulfides and thioesters onto cellulose nanocrystals to improve performance as fillers in rubber compositions. At least one embodiment describes a method of grafting a thiol or disulfide on a CNC surface by, for example, esterification of 3-mercapto-propionic acid (MPA), 3-(acetylthio) propionic acid (APA), or dithiodipropionic acid (DTDPA). The reaction can be carried out on CNC that is highly dispersed in a suitable solvent and the reaction conditions are improved to achieve an advantageous degree of substitution DS. Embodiments further disclose how the surface thiol groups may then be protected in a second step as thio esters or asymmetric disulfides to modulate the hydrophobicity of CNC to improve compatibility with styrene-butadiene, SBR or natural rubber.

The invention discloses yellowing-resistant light-cured organic silicon resin and a preparation method thereof, and belongs to the technical field of light-cured resin. The resin is prepared from the following raw materials in parts by weight: 80 to 100 parts of vinyl-terminated polysiloxane, 15 to 25 parts of trimethylolpropane tri (3-mercaptopropionate), 1 to 3 parts of yellowing-resistant aid, 2 to 4 parts of photoinitiator and 0.5 to 1 part of flatting agent. When the resin is prepared, the raw materials are uniformly mixed under a dark condition, and the resin is obtained after vacuum defoaming. Wherein the yellowing-resistant auxiliary agent is a benzotriazole ultraviolet light absorber and is synthesized through a multi-step reaction, the structure simultaneously contains a benzotriazole ring and anthryl, and the benzotriazole ring and the anthryl have a synergistic effect so that ultraviolet rays can be efficiently absorbed and yellowing can be inhibited. The obtained resin has excellent yellowing resistance and high curing speed, and is suitable for the fields of coatings, printing ink, adhesives, electronic packaging and the like.

The present invention belongs to the technical field of synthesizing and preparing organic polymer optical materials, and specifically relates to a method for preparing a pentaerythritol tetramercaptocarboxylate composition. The method comprises the following two steps: first, an addition reaction of thiourea with acrylic acid under photocatalysis to generate mercaptopropionic acid in situ; and second, a lipase-catalyzed esterification reaction of mercaptopropionic acid with pentaerythritol to obtain colorless, transparent, high-purity pentaerythritol tetramercaptocarboxylate. Simultaneously, a polymerizable modified polyurethane optical material containing the pentaerythritol tetramercaptocarboxylate is prepared, characterized by low cost, high light transmittance, and adjustable refractive index.

The present invention provides a flotation depressant for separating chalcopyrite and molybdenite, and a chalcopyrite and molybdenite beneficiation method, specifically relating to the field of mineral processing technology. The flotation depressant comprises sodium thioglycolate, a hydroxycarboxylic acid homologue, and a reducing agent in a mass ratio of (20-60):(1-5):(1-5). The hydroxycarboxylic acid homologue comprises at least one of 3-mercaptopropionic acid, β-mercaptopropionic acid, thiopropanoic acid, mercaptopropionic acid, and thiolactic acid. The flotation depressant provided by the present invention is economical to use and easy to add, effectively achieving efficient separation of molybdenite and chalcopyrite. Furthermore, the flotation depressant successfully solves the problem of excessive copper impurities in molybdenum concentrate when using only sodium thioglycolate, thereby reducing the overall cost of the depressant during flotation. The flotation depressant is not only highly efficient, but also clean and safe, effectively solving the difficulties in the separation of chalcopyrite and molybdenite.

The invention provides a preparation method of a magnetic recoverable catalyst and a method for synthesizing 3-mercaptopropionic acid, and mainly solves the problem that a large amount of acid and alkali solutions are needed in the existing acrylonitrile-sodium hydrosulfide and acrylic acid-thiourea process routes. The thiohydracrylic acid synthesis catalyst is prepared. The use conditions of the catalyst are as follows: the temperature is 30-80 DEG C, the reaction pressure is 0.5-3 MPa, the mass ratio of the acrylic acid to the solvent is 0.1-5, and the mass ratio of the acrylic acid to the catalyst is 0.2-20. Compared with the prior art, the catalyst disclosed by the invention is used as a synthetic catalyst for preparing thiohydracrylic acid through reaction of acrylic acid and hydrogen sulfide, a solid catalyst and a liquid reaction system can be completely separated by adopting simple methods such as filtration, centrifugation or magnetic separation, and a complicated pickling step is not needed; and the problem that a homogeneous catalyst is difficult to rectify after salification in the use process is avoided.

The invention discloses a rapid bacterium detection and counting method based on thiohydracrylic acid quantum dot fluorescence labeling, and the labeling method comprises the following steps: carrying out water-soluble modification on oil-phase quantum dots to obtain water-soluble quantum dot solids, uniformly dispersing the water-soluble quantum dot solids in water, and adjusting the pH value to 12-13 to obtain a water-phase quantum dot solution, the method for water-soluble modification of the oil-phase quantum dots comprises the following steps: dissolving solid oil-phase quantum dots in toluene, uniformly dispersing to obtain a quantum dot solution, adding thiohydracrylic acid into the quantum dot solution, carrying out oscillation reaction, standing, and drying precipitates obtained by centrifugation after precipitates are generated to obtain water-soluble quantum dot solids; and adding the aqueous-phase quantum dot solution into the bacterial liquid, and standing for reaction to finish marking. The bacteria marked by the solid oil phase quantum dots can be quickly imaged through a fluorescence microscope, and counting and morphological analysis of the bacteria can be quickly completed in combination with image analysis software capable of automatically identifying and counting the bacteria.

The invention relates to the technical field of plates and discloses a method for preparing an antibacterial and waterproof composite plate. The method uses mercaptopropionic acid and 2,2-dihydroxymethylpropionic acid as raw materials to prepare a product A, which is reacted with geraniol, nano-silver-loaded titanium dioxide, and tridecafluorooctanol in sequence to obtain bismercaptogeranyl ester, bismercapto nano-silver-loaded titanium dioxide, and bismercapto tridecafluorooctyl ester. The three products are added to polyvinyl chloride for reaction to obtain modified polyvinyl chloride, and the modified polyvinyl chloride is finally added to polyvinyl chloride, chlorinated polyethylene, and dioctyl phthalate and mixed uniformly to obtain an antibacterial and waterproof composite plate. The prepared composite plate has excellent antibacterial properties, waterproof properties, and mechanical properties.

The invention discloses a composition for relieving, repairing and promoting skin regeneration as well as a preparation method and application of the composition. The composition is prepared from the following raw materials in parts by weight: 0.1 to 5 parts of mandelic acid, 0.5 to 10 parts of a cynanchum atratum extract, 1 to 8 parts of a xylitol compound, 0.5 to 15 parts of regenerated silicon, 1 to 10 parts of a starfish regeneration repair factor, 0.3 to 1.5 parts of trimethylolpropane tri (3-mercaptopropionic acid) ester, 0.05 to 0.5 part of calcium chloride, 0.1 to 1 part of an additive, 0.2 to 2 parts of chitosan-polycaprolactone, 0.2 to 1 part of a pH regulator and 5 to 15 parts of a solvent. 0.3 to 0.8 part of an antioxidant and 3 to 10 parts of a humectant; the additive is hyaluronic acid or formylated hyaluronic acid. Through a multi-channel synergistic effect, the effects of relieving, repairing and promoting skin regeneration are improved.

The invention relates to the technical field of high polymer materials, and particularly discloses a high-strength polyurethane adhesive as well as a preparation method and application thereof. The adhesive is prepared by compounding a double-bond-terminated polyurethane prepolymer monomer and a multi-sulfydryl cross-linking agent. And the prepolymer monomer is synthesized by reacting 4, 4-diisocyanate dicyclohexylmethane and hydroxyethyl (meth) acrylate according to a molar ratio of 1: 2. The polythiol cross-linking agent is tetrakis (3-mercaptopropionic acid) pentaerythritol ester or tetrakis (2-mercaptoacetic acid) pentaerythritol ester. When in use, the two components are mixed and then coated on a base material, and the mixture is cured at 30-100 DEG C for 0.5-5 hours. The adhesive disclosed by the invention forms a compact network through multiple crosslinking mechanisms such as sulfydryl-alkene Michael addition, so that the adhesive has extremely high shear strength (up to more than 30MPa) and excellent heat resistance and aging resistance on metal, glass, glass fiber plates and the like.

The invention discloses a preparation method of an MOF material for food detection, and relates to the technical field of food detection materials. The MOF material for food detection comprises the following raw materials in parts by weight: 15-25 parts of zinc nitrate, 12-18 parts of modified terephthalic acid, 8-12 parts of 2-aminoterephthalic acid, 10-14 parts of cobalt nitrate hexahydrate and 180-220 parts of N, N-dimethylformamide. The graphene quantum dot / graphene quantum dot composite material is prepared from the following raw materials in parts by weight: 100 parts of N, N-dimethylformamide, 130 to 170 parts of absolute ethyl alcohol, 180 to 220 parts of deionized water, 4 to 6 parts of polyvinylpyrrolidone, 0.008 to 0.012 part of modified graphene quantum dots, 4 to 6 parts of mercaptopropionic acid, 2 to 4 parts of dopamine, 1.5 to 2.5 parts of aminated multi-walled carbon nanotubes, 7 to 11 parts of triethylamine, 1 to 3 parts of montmorillonite nanosheets, 0.5 to 1.5 parts of gold nanoparticles and 2 to 4 parts of chitosan. The MOF material prepared by the invention is endowed with high selectivity, high sensitivity, quick response and strong stability through deep modification of terephthalic acid and graphene quantum dots. By combining a multi-step composite process, the material can be used for widely detecting various harmful substances such as heavy metals and pesticide residues, is adaptive to complex food matrixes and has industrial application potential.

The invention discloses a carbon nanotube / cadmium selenide quantum dot heterojunction photoelectric catalyst as well as a preparation method and application thereof. The method comprises the following steps: activating single-wall and / or multi-wall carbon nanotubes by aqua regia at room temperature, dispersing the single-wall and / or multi-wall carbon nanotubes in an aqueous solution containing CdCl2. 5H2O, adding a Na2SeSO3 selenium source and 3-mercaptopropionic acid, and reacting at 110-150 DEG C, so that CdSe quantum dots with the particle size of 1-5 nm are subjected to in-situ nucleation growth on the surfaces and / or the interiors of the carbon nanotubes and form a heterojunction interface. The obtained catalyst and Nafion are prepared into ink drops, the ink drops are coated on conductive glass to construct a photocathode, in an H-type electrolytic tank with a light path, a high-purity CO2 saturated bicarbonate aqueous solution is used as an electrolyte, Ag / AgCl is used as a reference electrode, and under irradiation of an LED light source with the maximum wavelength being 450 nm and bias voltage ranging from-0.1 V (vs. RHE) to-1.0 V (vs. RHE), CO is generated through water-phase photoelectrocatalysis CO2 reduction. The photoelectrocatalyst has the characteristics of simple synthesis method and excellent photoelectrocatalytic reduction effect of carbon dioxide.

The application discloses a preparation method of nano copper powder and belongs to the technical field of nano copper powder preparation. The method comprises the following steps: S1, preparing a mercaptopropionic acid-ethanol solution; S2, preparing surface carboxylated quantum dots; S3, preparing an enzyme solution; S4, preparing an enzyme solution in which surface carboxyl groups are converted into active esters; S5, preparing a surface carboxylated quantum dot solution; S6, preparing a quantum dot-biomolecule mixture; S7, preparing a copper salt solution and adjusting the pH to 5-6; and S8, preparing nano copper powder. In the method, copper ions in the copper salt solution are reduced into copper atoms by the quantum dot-biomolecule mixture to prepare the nano copper powder. The prepared nano copper powder can accurately control the nucleation rate and quantity of the nano copper powder, and has low preparation cost and high preparation efficiency.

The invention belongs to the technical field of nano materials, and particularly relates to a polyoxazoline coated gold nano cage and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: (1) heating an ethylene glycol solution, then adding sodium hydrosulfide, hydrochloric acid, polyvinylpyrrolidone and silver trifluoroacetate for reaction, then standing the mixture to prepare silver nanocubes (AgNc), and washing the obtained AgNc with acetone and deionized water; (2) adding tetrachloroauric acid into the obtained AgNc solution, carrying out an electric replacement reaction to generate a gold nanocage (AuNc), and washing with ethanol and ultrapure water to remove impurities after the reaction is completed; and (3) adding 3-thiohydracrylic acid into the obtained AuNc solution to enable gold and sulfydryl to form a coordinate bond, and then adding poly (2-ethyl-2-oxazoline) to coat AuNc to form a final product, namely the polyoxazoline coated gold nanocage (AuNc (at) PEtOx). The preparation method of AuNc (at) PEtOx provided by the invention is simple, convenient and efficient; in addition, AuNc (at) PEtOx has good photo-thermal characteristics when exposed to laser with the wavelength of 808 nm.

The present invention relates to the field of environmental protection, and more particularly to a method for preparing an energy-saving new material from photovoltaic waste. The present invention uses modified phenolic resin as a raw material to prepare resin porous carbon, and conducts a mercapto-olefin addition reaction between the mercapto-silicon-containing phenolic resin and methacryloyloxy silicon powder. The volume expansion of silicon nanoparticles is suppressed, thereby maintaining the structural stability of a silicon negative electrode and reducing side reactions at the interface between an electrolyte and silicon. The steam generated by heating 2-mercaptopropionic acid and monosilane introduce silicon elements into the resin porous carbon, and vinylguanamine provides a nitrogen source, thereby helping to avoid silicon element agglomeration and improving the uniformity of silicon element distribution, thereby helping to increase the specific capacity of the negative electrode material. The present invention recycles waste materials from the photovoltaic industry to prepare an energy-saving new material, which can be used to produce lithium-ion battery negative electrodes, thus realizing the transformation of waste into treasure.

The present invention relates to the technical field of coatings, and specifically relates to a wear-resistant coating and a preparation method thereof, comprising the following raw materials: a solvent, a modified resin, a filler, a dispersant, an antifoaming agent, a hardening agent, and a curing agent; the modified resin is prepared from oil-repellent particles, B resin, and a silane coupling agent; the oil-repellent particles are prepared from silicon dioxide, tetraethyl orthosilicate, 1H,1H,2H,2H-heptadecafluorodecyltrichlorosilane, and diatomaceous earth, and it can improve the oil resistance of the coating; the filler is obtained by mixing modified graphite, silicon carbide, silicon dioxide, molybdenum disulfide, and iron(III) oxide in a specific ratio, and it can improve the self-lubricity, mechanical properties, and oil resistance of the coating; the hardening agent is pentaerythritol tetrakis(3-mercaptopropionate) grafted with 1H,1H,2H,2H-heptadecafluorodecyl acrylate, and it will undergo chemical cross-linking with other components to improve the wear resistance of the coating; therefore, the wear-resistant coating of the present invention has good oil resistance, wear resistance, and broad application prospects.

The application discloses a preparation method of a semi-interpenetrating network hydrogel based on an amino-succinimide ring-opening reaction, which comprises the following steps: firstly, a hydrophilic compound containing amino groups, such as trishydroxymethylaminomethane, is used to modify polysuccinimide to obtain water-soluble polysuccinimide polymer; N-vinylcaprolactam and 3-mercaptopropionic acid are reacted to obtain poly-N-vinylcaprolactam polymer with terminal carboxyl groups; and the polymer is used to graft hydroxypropyl methyl cellulose to obtain macromolecular hydroxypropyl methyl cellulose derivative. The water-soluble polysuccinimide, the polymer containing amino groups and the hydroxypropyl methyl cellulose derivative are dissolved in water, and the amino-succinimide ring-opening reaction is utilized to obtain the hydrogel; the hydrogel is soaked in water to remove uncrosslinked components; and after drying, the semi-interpenetrating network hydrogel is obtained. The preparation process is simple, the conditions are mild, and the reaction speed is fast; and the prepared hydrogel has pH / temperature sensitivity and can be used in many fields such as tissue engineering, drug release, water treatment and the like.

The present invention relates to the technical field of heavy metal adsorbents, and specifically relates to a renewable adsorbent for removing heavy metal ions and a preparation method thereof. The renewable adsorbent comprises the following raw materials in parts by weight: 10-15 parts of modified loofah sponge, 8-12 parts of salicylaldehyde thiosemicarbazide triazine; the preparation raw materials of the modified loofah sponge are made from loofah sponge, epichlorohydrin and pentaerythritol tetra(3-mercaptopropionate), and the preparation raw materials of the salicylaldehyde thiosemicarbazide triazine comprise the following components in parts by weight: 2-3 parts of 5-chloromethyl salicylaldehyde, 1.2-1.6 parts of thiosemicarbazide, 6.5-9.7 parts of cyanuric chloride. The renewable adsorbent prepared by the present invention has a high adsorption capacity and good cycling performance.

The application relates to the field of biological medicine, and discloses an active oxygen response thione aldehyde linker as well as a preparation method and application thereof. The thione aldehyde linker structure is a thione aldehyde structure with a p-hydroxyphenyl as a center. The thione aldehyde carbon atom is connected with two -CH2CH2COOH groups through a sulfur atom. The preparation method of the active oxygen response thione aldehyde linker comprises the following steps: dissolving 3-mercapto propionic acid and p-hydroxybenzaldehyde in ethyl acetate, adding trifluoroacetic acid as a catalyst, stirring and reacting at room temperature, and after the reaction is completed, the thione aldehyde linker is obtained through separation and purification. The thione aldehyde linker can respond to the increased ROS level in a tumor microenvironment, is broken under a high ROS condition, and thus realizes the release of a drug molecule connected therewith, which is beneficial to realizing the specific release of the drug at a tumor site.