62 results about "Ethylenediamine" patented technology

The invention belongs to the technical field of underground engineering grouting materials, and discloses an anti-dispersion solid waste grouting filling material and a preparation method and application thereof. The slurry A is prepared from the following components in parts by mass: 400 to 1000 parts of fly ash, 500 to 1000 parts of blast furnace slag, 100 to 500 parts of Portland cement, 250 to 1200 parts of water, 5 to 50 parts of sodium hydroxide and 10 to 50 parts of PolyFure-I; the polyFure-I comprises acrylamide and N, N, N ', N'-tetramethylethylenediamine, and the polyFure-I comprises acrylamide and N, N, N ', N'-tetramethylethylenediamine; the slurry B is prepared from the following components in parts by mass: water glass and PolyFure-II; the PolyFure-II is prepared from water glass, an ammonium persulfate solution, xanthan gum and carboxymethyl cellulose. The flowing water dispersion resistance of the grouting material is effectively improved, the blocking effect of flowing water is enhanced, and the problem of insufficient blocking of a traditional grouting material is solved.

The invention belongs to the technical field of flame-retardant materials, and particularly relates to a preparation method of a P-N synergistic halogen-free flame-retardant curing agent and application of the P-N synergistic halogen-free flame-retardant curing agent in epoxy resin. Phosphorus oxychloride reacts with a phenolic compound containing an aldehyde group to obtain a polyaldehyde compound containing phospholipid, and then the polyaldehyde compound containing phospholipid reacts with N-methylethylenediamine to obtain a halogen-free flame-retardant curing agent containing phosphorus and nitrogen elements, and the halogen-free flame-retardant curing agent containing phosphorus and nitrogen elements is used for curing epoxy resin, so that the reaction type halogen-free flame-retardant epoxy resin material is prepared. Due to the synergistic effect of phosphorus and nitrogen elements, the material has excellent char forming performance and flame retardant property.

This invention discloses a polyoxometalate that catalyzes the Knoevenagel reaction, its preparation method, and its applications. The chemical formula of the polyoxometalate that catalyzes the Knoevenagel reaction is: H3[K(H2O)6][K2(H2O) 10 ]2[Cu(en)2(H2O)2][Cu(en)2(Nb6O 19 Cu(en))2·24H2O, where en = ethylenediamine; the polyoxometalate crystals catalyzing the Knoevenagel reaction belong to the triclinic crystal system with space group P-1; the polyoxometalates catalyzing the Knoevenagel reaction prepared in this invention exhibit excellent heterogeneous catalytic performance in the highly efficient Knoevenagel condensation reaction, showing high yield and high stability under isothermal conditions at a 1:1 substrate ratio and over a wide substrate range. The superior catalytic ability of the polyoxometalates catalyzing the Knoevenagel reaction can be attributed to the presence of dense and effective basic sites on the surface of the heteropolycationic chain, and the increased contact frequency between the organic-inorganic hybrid catalyst and the substrate.

The present invention discloses a preparation method of chrome-free tanned upper leather, comprising the following steps: Step 1: Re-wetting Add the prepared aqueous solution of sodium chloride and sodium bicarbonate into a drum machine, and then put in the raw hide, and rotate for 10 - 30 min; Step 2: Water washing Immerse the re-wetted raw hide in pure water and wash for 10 - 30 min; Step 3: Tanning Add water, a catalyst, and a modified tanning agent into the drum machine, and run the drum machine for tanning for 200 - 360 min; Step 4: Alkali raising Add sodium bicarbonate into the drum machine, adjust the pH to 8.0, raise the temperature to 35 °C, rotate for 4 h, stand for 5 - 20 h, and dry to obtain the upper leather; The modified tanning agent is formed by the reaction of starch, trimethylolethane triglycidyl ether, tetramethylethylenediamine, N-(2-hydroxyethyl)guanidine, and epoxypropionic acid. The purpose of the present invention is to provide a preparation method of chrome-free tanned upper leather.

The invention provides a solar cell and a preparation method thereof, and a photovoltaic module, the solar cell comprises a substrate, and a hole transport layer, a perovskite layer, a passivation layer and an electron transport layer which are sequentially arranged on the substrate, and the passivation layer is located between the perovskite layer and the electron transport layer; and the passivation layer comprises a mercaptopyridine compound and ethanediamine diiodide, so that the surface defects of the perovskite layer are reduced, and the interface recombination of the top interface between the perovskite layer and the electron transport layer is reduced, thereby improving the photoelectric conversion efficiency of the solar cell.

This invention discloses a method for preparing a composite for treating acrylonitrile production wastewater, comprising: dispersing an oxidant in an aqueous solution, then adding graphite material, heating the system and stirring to react, maintaining the temperature after the reaction, adding an aqueous solution of β-glycerophosphate and stirring until homogeneous, then naturally cooling to room temperature, allowing it to stand, removing the graphite material, and performing conventional washing, drying, and pulverizing to obtain modified graphite powder with a particle size of 200-400 mesh; dissolving a polyol in water, then heating to a certain temperature, adding N1,N2-bis(2,3-dihydroxy-4,6-disulfonic acid benzyl)ethylenediamine and stirring, then adding polyacrylamide until completely dissolved, then adding the modified graphite powder obtained above and stirring until homogeneous, maintaining the temperature and reacting under ultraviolet light, and cooling to room temperature after the reaction to obtain the final product. The composite of this invention can effectively treat pollutants in wastewater, and the process is simple and low-cost.

The invention discloses a synthesis method and application of urolithin A and urolithin B derivatives, and discloses several novel urolithin A and urolithin B derivatives and related activity information. A series of novel urolithin A and urolithin B derivatives are obtained by respectively taking urolithin A and urolithin B as parent bodies and carrying out alkylation reaction on the parent bodies and halogenated hydrocarbon. In an alkaline environment, the urolithin and halogenated hydrocarbon are subjected to an alkylation reaction to generate a target derivative. And further purifying and separating a crude product obtained by the reaction, and determining a target structure by using nuclear magnetic spectrum. The invention discloses a synthesis method of two types of urolithin derivatives, structural information and anti-inflammatory and anti-oxidation effect results on ZEA-OGCs (Zinc Ethylenediamine-Oriented Growth Cells). A reference is provided for exploring wider structural modification of urolithin substances; rich structure types provide a structural basis for activity research of urolithin substances.

The invention relates to the technical field of wastewater treatment, and particularly provides a method for improving the anaerobic ammonia oxidation denitrification effect of high-ammonia-nitrogen wastewater. The method is realized by adding one or more enhancer combinations into a reaction system, wherein the enhancer is selected from vitamin B6, siderophore catechin (CAT) and siderophore hydroxyethyl ethylenediamine triacetic acid (HEDTA). By adding the enhancer, the inhibition effect of a high-ammonia-nitrogen environment on anaerobic ammonium oxidation functional flora can be effectively relieved, and the metabolic activity and the proliferation rate of the anaerobic ammonium oxidation flora are remarkably enhanced. The method is simple and convenient to operate and low in cost, can greatly improve the denitrification efficiency and operation stability of the system under high ammonia nitrogen load on the premise of not changing the structure of the existing reaction system, and is suitable for treating high ammonia nitrogen wastewater such as mine leaching tail water, landfill leachate and the like.

The invention belongs to the field of organic solar cell acceptor material preparation, and discloses a preparation method of an organic non-fullerene acceptor intermediate, which comprises the following steps: taking dichloromethane as a solvent, mixing and stirring a compound 1 and a compound A, adding metal chloride in batches, reacting to obtain a compound 2, taking alpha as a solvent, and reacting to obtain the organic non-fullerene acceptor intermediate. Reacting the compound 2, the compound B and alkali liquor, and extracting to obtain a compound 3; taking monohydric alcohol as a solvent, reacting the compound 3 with sodium hydroxide, removing the solvent, adding water, adjusting the pH value to 1-2, stirring, filtering and drying to obtain a compound 4; taking beta as a solvent, reacting the compound 4, tetramethylethylenediamine and cuprous oxide to the end point, adding an acidifying agent, extracting with petroleum ether, filtering the obtained organic phase with diatomite, washing a filter cake with petroleum ether, removing the organic solvent under reduced pressure, and drying to obtain a compound 5; taking tetrahydrofuran as a solvent, reacting the compound 5, extracting with petroleum ether, and removing the organic solvent under reduced pressure to obtain a compound 6;

The invention discloses a chiral tripyridine-bis (sulfonylation) imidazoline ligand Tpy-bisulidine and a preparation method of the chiral tripyridine-bis (sulfonylation) imidazoline ligand Tpy-bisulidine. According to the invention, corresponding sulfonylation (R, R)-diphenylethylenediamine 1 and tripyridine-dicarboxaldehyde 2 are subjected to a condensation reaction, and a final product, namely the chiral tripyridine-bis-sulfonylation imidazoline ligand (Tpy-bis-sulfonylation imidazoline), is generated. The ligand contains a tripyridine group and an imidazoline group (a nitrogen group of tripyridine and a tertiary amine nitrogen atom of imidazoline belong to electron-rich coordination sites, and N-H of imidazoline can participate in hydrogen-bond interaction), and can form five-membered ring coordination with Lewis metal, so that a chiral ligand metal compound is generated, and the chiral ligand metal compound is used for preparing a chiral ligand. The compound can be used as a chiral ligand in an asymmetric catalytic reaction. Therefore, the method has important application value in the field of asymmetric catalytic synthesis, and the synthesis method is very economical, simple and convenient. And the compound also has good air stability and wide applicability, and has good compatibility with various substituent groups.

The invention provides an azo dye adsorbent preparation method, which comprises: S1, carrying out alkali treatment on a pyrolytic coke raw material to obtain porous pyrolytic coke; s2, introducing inert gas into the organic amine solution to obtain inert gas carrying organic amine; the organic amine comprises at least one of diethanol amine, hydroxyethyl ethylenediamine and diethylenetriamine; and S3, placing the porous pyrolytic coke in a reactor, then introducing inert gas carrying organic amine into the reactor, and carrying out organic amine modification on the porous pyrolytic coke by adopting a low-temperature plasma technology to obtain the azo dye adsorbent. According to the method, the pyrolytic coke is adopted as the raw material, resource utilization of the waste heat pyrolytic coke is achieved while pollution is reduced, the waste heat pyrolytic coke obtains the use value again through recycling and reprocessing, and resource waste is effectively reduced. The azo dye adsorbent obtained by adopting the preparation method disclosed by the invention has an excellent adsorption effect and has a good application prospect in azo dye wastewater treatment.

The present invention provides a class of novel chiral benzene-ring framework phosphine-1,2-diphenylethylenediamine ligands, their preparation methods, and their applications in asymmetric hydrogenation reactions. 2-Diphenylphosphinobenzaldehyde and 1,2-diphenylethylenediamine are added to a Schlenk flask in a molar ratio of 1:1.2. After filling with nitrogen, methanol (0.2 M) is added. The resulting mixture is refluxed at 80 °C for 1-2 hours. After cooling to room temperature, 2 equiv. of NaBH4 is added, and then the mixture is refluxed again at 80 °C for 3-4 hours. After cooling to room temperature, water is added to the reaction solution, and then extracted with dichloromethane, dried over anhydrous sodium sulfate. After removing the solvent, the desired chiral benzene-ring framework phosphine-1,2-diphenylethylenediamine ligand is obtained by column chromatography. The catalysts formed by the chiral ligands of the present invention and metal precursors such as Ir- and Ru- have excellent catalytic activity and stereoselectivity in the catalytic asymmetric hydrogenation reactions of C=C, C=N, and C=O double bonds, with an enantioselectivity of up to 99% ee and a TON of up to 100,000.

The present invention discloses a solar heat-absorbing material and a preparation method thereof, belonging to the technical field of preparation of heat-absorbing materials. The raw materials for preparing the heat-absorbing material in the present invention mainly include silicon carbide powder, silica sol, silane coupling agent KH550, tetramethylethylenediamine, calcium carbonate, porous graphene, and polyvinylidene fluoride. In order to avoid problems such as environmental pollution and low density of the material itself existing in the existing preparation methods, the present invention first prepares a kind of porous graphene, and then uses the porous graphene to prepare the solar heat-absorbing material, so that the adhesion between the porous graphene and the foam ceramic slurry is firm, and the solar heat-absorbing material is obtained by sintering and heat preservation. Through the above steps, not only the properties such as hardness and porosity of the solar heat-absorbing material are improved, but also the environmental pollution caused by the release of organic gases during sintering in the traditional method is reduced.

The invention discloses a chiral bipyridine-bis (sulfonylation) imidazoline'crab 'type ligand (Bpy-Bisulidine) and a preparation method of the chiral bipyridine-bis (sulfonylation) imidazoline'crab' type ligand (Bpy-Bisulidine). According to the invention, corresponding sulfonylation (R, R)-diphenylethylenediamine 1 and dipyridyl-dicarboxaldehyde 2 are subjected to a condensation reaction, and a final product, namely the chiral bipyridyl-bis-sulfonylation imidazoline'crab '-shaped ligand (Bpy-Bisulidine), is generated. The ligand contains a bipyridine group and an imidazoline group, and can form five-membered ring coordination with Lewis metal, so that a chiral ligand metal compound is generated, and the chiral ligand metal compound is applied as a chiral ligand in an asymmetric catalytic reaction. Therefore, the method has important application value in the field of asymmetric catalytic synthesis, and the synthesis method is very economical, simple and convenient. And the compound also has good air stability and wide applicability, and has good compatibility with various substituent groups.

The application provides a kind of full solid waste geopolymer grouting material and preparation method thereof, relate to solid waste resource utilization and geopolymer grouting material preparation technical field.The full solid waste geopolymer grouting material includes the following weight parts of raw materials: full solid waste mixture 100-200 parts, alkaline activator 40-50 parts, early strength agent 0.1-0.5 parts, water reducing agent 0.5-1 part, modifier 3-7 parts, water 70-90 parts;The full solid waste material includes slag powder, steel slag powder, phosphogypsum, fly ash;The modifier includes aluminum dihydrogen phosphate, vinyl triacetoxy silane, ethylenediamine terminated polyethylene imine.The full solid waste geopolymer grouting material provided by the application has good working performance, high early strength, micro-expansibility and other characteristics.

The invention belongs to the technical field of hydrogen bond organic framework materials, and relates to a chiral luminescent ionic hydrogen bond organic framework material, the chemical formula is [(H2CBS) 4 (R / S-DPEN) 4. (EtOH) 2 (H2O) 18] n, n is a positive integer, H2CBS is 4, 4 '-bis (2-sulfostyryl) biphenyl, and R / S-DPEN is R / S-diphenylethylenediamine. The structural unit belongs to a triclinic system, the space group is P1, and the molecular formula is C177H222N8O50S8. The preparation method comprises the following steps: dissolving an H2CBS ligand and an R / S-DPEN ligand in a mixed solution of water and ethanol to obtain a reaction solution; and carrying out sealed heat preservation on the reaction liquid at 5-8 DEG C to obtain colorless transparent rod-like crystals, filtering and drying to obtain the chiral luminous ionic hydrogen bond organic framework material. The material has high light-emitting quantum yield and good structural stability and reversibility, and has important application value in the fields of organic light-emitting diodes (OLEDs), biological imaging, photoelectric devices and the like.

A rare earth-based electrolytic coloring method, electrolyte, and alloy product are provided, where the method includes: after an oxide film is formed on a workpiece subjected to anodic oxidation in the electrolyte, rapidly increasing a voltage, and by using a constant-voltage mode, breaking down, melting, sintering, and reforming the oxide film cyclically multiple times under conditions of high frequency, a high voltage, and instantaneous high temperature, to generate a ceramic film layer metallurgically bonded to a substrate. The oxide film has a greater thickness and lower reflectance, and an appearance as a matte black anode, and has good color consistency and no chromatic aberration. Components of the electrolyte include sodium silicate at a concentration of 5-70 g / L, sodium tungstate at a concentration of 1-18 g / L, disodium ethylenediamine tetraacetic acid at a concentration of 2-10 g / L, and rare earth salts at concentrations of 1-2 g / L.

The invention discloses a low-nicotine tobacco extract and a preparation method thereof. The preparation method comprises the following steps: mixing tobacco leaves and a solvent, and standing; heating and refluxing the mixed solution, and extracting to obtain a tobacco extracting solution; crushing bamboos to obtain bamboo powder particles; placing the bamboo powder particles in phosphoric acid ethylenediamine, and performing ultrasonic oscillation to obtain activated bamboo powder particles; heating and dehydrating, and then sealing and pressurizing; the treated bamboo powder particles are heated and pyrolyzed, obtained bamboo charcoal is sieved and then washed until a washing solution is clear and colorless and the pH value is kept unchanged, and a porous bamboo charcoal material is obtained through air drying; soaking the porous bamboo charcoal material in NaOH, filtering and cleaning until the pH value of filtrate is not changed, and drying to obtain a modified porous bamboo charcoal material; and mixing the modified porous bamboo charcoal adsorption material with a tobacco extracting solution, and concentrating to obtain the low-nicotine tobacco extract. The preparation method of the low-nicotine tobacco extract is easy to operate, raw materials are low in cost, and the low-nicotine tobacco extract is non-toxic and renewable; meanwhile, nicotine can be better adsorbed. The low-nicotine tobacco extract can obviously soften smoke and reduce dry feeling and irritation.

The invention relates to the technical field of ceramics, in particular to a method for combining silicon carbide nanowires with silicon carbide ceramics. The preparation method comprises the following steps: 1, putting an ethanol solution into a container, adding acrylamide and N, N-methylene bisacrylamide, and dissolving to form a premixed solution; 2, Si powder and activated carbon are ground, and mixed powder is obtained; step 3, adding the mixed powder in the step 2 into the premixed solution in the step 1, then adding an ammonium persulfate solution and N, N, N, N-tetramethylethylenediamine, immediately pouring into a silica gel mold, and standing at room temperature; and step 4, after demolding, placing the product in a nitriding furnace for heat treatment to obtain the silicon carbide nanowire combined silicon carbide porous ceramic. The product has high porosity of 60%, compressive strength of 2.6 MPa, good electromagnetic wave absorption performance, minimum reflection loss (RLmin) of 50.2 dB, maximum effective absorption bandwidth (EABmax) of 9.6 GHz and low heat conductivity coefficient of 0.074 W / (m.K).

The invention relates to the technical field of soldering flux, and particularly discloses a water-soluble normal-temperature solidification type soldering flux for an aluminum soldering tin wire and a preparation method of the soldering flux. The invention relates to a water-soluble normal-temperature solidification type soldering flux for an aluminum soldering tin wire. The soldering flux comprises the following components in parts by mass: 16-24 parts of polyethylene glycol; 16 to 24 parts of fluoboric acid; 15 to 31 parts of tri-n-octylamine; 14 to 26 parts of tetramethylethylenediamine; 8 to 12 parts of water-soluble zinc salt; 2 to 8 parts of water-soluble stannous salt; 0.4 to 1 part of a surfactant; and 0.6-2 parts of a slow release agent. The water-soluble soldering flux has the advantages that the water-soluble soldering flux which is in a solid state at normal temperature can better improve the welding strength, and the residual color after welding is relatively light.

The oversleeve with the gel cold insulation structure comprises a cover protection containing assembly, a tight fit positioning assembly, an opening and closing switching assembly, a gel cold insulation assembly and an embedded connection assembly, the gel cold insulation assembly arranged on the oversleeve provides a cold insulation effect through an internal gel piece, an arm can be cooled for a long time, and the cold insulation effect is good. The oversleeve is suitable for occasions needing cooling or cold compress, such as outdoor high-temperature environments or occasions where the body surface temperature needs to be rapidly reduced after exercises, the cover protection containing assembly is matched with the shape of an arm and can be tightly attached to the arm, cold air loss is reduced, the cold insulation effect is improved, the tight fit positioning assembly can conduct positioning according to the shape of the arm, stable wearing of the oversleeve is guaranteed, and the service life of the oversleeve is prolonged. Acrylic acid and sodium hydroxide are adopted as main raw materials, a low-temperature initiator sodium hydrogen sulfite, tetramethylethylenediamine, a cross-linking agent and other auxiliaries are added, a gel sheet is manufactured through a low-temperature self-polymerization production process, complex procedures such as manual bubble discharging and hot press molding are not needed, and the production cost is reduced.

The invention discloses a CsCu3S2 semiconductor material, a CsCu3S2 / Ga2O3 heterojunction and application of the CsCu3S2 / Ga2O3 heterojunction in photoelectric detection, and the CsCu3S2 semiconductor material and the CsCu3S2 / Ga2O3 heterojunction comprises the following steps: weighing cuprous sulfide, thiourea and cesium hydroxide monohydrate, and adding the cuprous sulfide, the thiourea and the cesium hydroxide monohydrate into a polytetrafluoroethylene liner; adding ethidene diamine into the polytetrafluoroethylene liner, sealing the polytetrafluoroethylene liner, then loading the polytetrafluoroethylene liner into a reaction kettle, and pressurizing to form a closed self-pressure system; placing the reaction kettle in a drying oven for heating and heat preservation, and naturally cooling to room temperature; sequentially carrying out cleaning and centrifugal treatment on the cooled reaction product; and removing the centrifuged supernatant, and carrying out vacuum drying on the precipitate to obtain CsCu3S2 nano-particle powder. The CsCu3S2 nano-particles prepared by the method are high in purity, good in crystallinity, high in light absorption activity and uniform in morphology; meanwhile, a CsCu3S2 sheet is used as a light absorption layer to be combined with Ga2O3 to form a heterojunction, and the heterojunction is combined with a silver paste electrode to form the photoelectric detector with excellent self-power-supply characteristics.

The invention provides a lead-tin perovskite precursor material, a lead-tin perovskite solar cell and application, and relates to the technical field of solar cells, and the lead-tin perovskite precursor material comprises the following components: a lead-tin perovskite material base solution and ethylenediamine diacetate (EDAAc for short, no longer described in the following); wherein the lead-tin perovskite material base solution comprises a semiconductor compound solution. According to the invention, the EDAAc solution is used as an ionic liquid type additive, and the lead-tin perovskite precursor material obtained through the introduction of the ionic liquid type additive is used for preparing a uniform and compact perovskite light absorption layer, improving the energy level distribution on the surface of perovskite, enhancing the surface hydrophobicity of a thin film, and improving the efficiency and stability of a device.

A rare earth-based electrolytic coloring method, electrolyte, and alloy product are provided, where the method includes: after an oxide film is formed on a workpiece subjected to anodic oxidation in the electrolyte, rapidly increasing a voltage, and by using a constant-voltage mode, breaking down, melting, sintering, and reforming the oxide film cyclically multiple times under conditions of high frequency, a high voltage, and instantaneous high temperature, to generate a ceramic film layer metallurgically bonded to a substrate. The oxide film has a greater thickness and lower reflectance, and an appearance as a matte black anode, and has good color consistency and no chromatic aberration. Components of the electrolyte include sodium silicate at a concentration of 5-70 g / L, sodium tungstate at a concentration of 1-18 g / L, disodium ethylenediamine tetraacetic acid at a concentration of 2-10 g / L, and rare earth salts at concentrations of 1-2 g / L.

Described herein are cleaning compositions comprising an alkali metal bicarbonate, an alkali metal carbonate, an acid source, an antibacterial composition comprising sodium percarbonate and tetraacetylethylenediamine, and wherein the sodium percarbonate is present in an amount ranging from about 2 wt% to about 15 wt% based on the total weight of the cleaning composition, and the amount of tetraacetylethylenediamine is in the range of about 1 wt% to about 7 wt% based on the total weight of the cleaning composition.

The invention discloses a super-long carbon nanotube-silicon nitride composite material and a preparation method and application thereof.The method comprises the steps that polysilazane, acetone and ferrocene are mixed and cured, and a sample A is formed; grinding the sample A into powder, and spreading the powder on the surface of carbon paper for heat treatment to obtain a silicon nitride nanowire film; placing the silicon nitride nanowire film in a deposition furnace, and introducing nitrogen and natural gas for reaction to obtain a silicon nitride nanowire film coated with a carbon layer on the surface; and placing the silicon nitride nanowire film coated with the carbon layer on the surface in a chemical vapor deposition furnace, injecting a mixed solution of ferrocene, ethanol and ethidene diamine, and reacting to prepare the super-long carbon nanotube-silicon nitride composite material. According to the method, the carbon layer is constructed on the surface of the silicon nitride nanowire, the surface structure of the silicon nitride nanowire is improved, the reaction activity of the substrate is improved, a proper nucleation site is provided for promoting rapid generation of the carbon nanotube, and then the super-long carbon nanotube is rapidly constructed on the surface of the silicon nitride nanowire through chemical vapor infiltration.

This invention discloses a cyanide-free gold plating solution with a photoresist-protective sulfite system and its application method, belonging to the field of microelectronic packaging electroplating technology. The gold plating solution comprises a gold sulfite main salt, a sulfite main complexing agent, an ethylenediamine auxiliary complexing agent, a maleimide-based polyethylene glycol derivative, and a pH buffer system, which can stably maintain the pH value of the plating solution at 6.5-7.5. This invention relies on the coordination mechanism of in-situ reaction, interface enrichment, and barrier formation to block the erosion of photoresist by free ethylenediamine, resolving the contradiction between ethylenediamine dosage and plating solution stability and photoresist compatibility, and can reduce the amount of ethylenediamine used by 10%-30%. This gold plating solution exhibits excellent long-term stability, completely avoiding photoresist swelling, peeling, and plating defects. The resulting plating layer is bright, dense, and has good flatness. Key performance characteristics meet semiconductor packaging requirements, and it is suitable for high-precision photolithographic patterning electroplating with fine pitch <20μm. The process is simple and can effectively improve packaging yield.

The alkali precipitation desalting method comprises the following steps: S1, taking the distilled amine wastewater, slowly adding a certain amount of caustic soda flakes into the distilled amine wastewater, stirring and dissolving in a water bath at 50 DEG C, then cooling to 25 DEG C, and standing for 30 minutes; s2, the solution obtained after standing is further subjected to centrifugal separation and precipitation, upper-layer alkali liquor and precipitates are obtained, and the upper-layer alkali liquor can be circularly used for neutralization reaction liquid to serve as an alkaline raw material for producing tetramethylethylenediamine; and S3, washing the precipitate with deionized water, pouring the washed precipitate into a Buchner funnel, carrying out suction filtration, and carrying out vacuum drying treatment on a filter cake to obtain a pure sodium salt product. Compared with a traditional desalting method, the alkali precipitation desalting method for the amine steaming wastewater has the advantages that the cost is saved, steam distillation is avoided, the upper-layer alkali liquor can still be used as alkali to neutralize reaction liquid before amine steaming, the replacement desalting efficiency is high, the recycled salt can be recycled, the production cost is reduced, environmental protection and economical efficiency are both considered, and the alkali precipitation desalting method is suitable for industrial popularization and application.

The invention discloses a preparation method of a 3D printing polyimine thermosetting material and a method for realizing room-temperature connection, and relates to a preparation method of a 3D printing material and a connection method of the material. The method aims at solving the technical problems that the environment is harsh, the operation is complicated, and the assembly of parts with complicated configurations is difficult to realize in the connecting process of the existing polyimine material. The method comprises the following steps: 1, preparing modified vanillin; 2, preparing an imine precursor; 3, preparing printing resin; 4, performing 3D printing on the green body; and 5, cleaning to obtain the 3D printing polyimine thermosetting material. The connection method at room temperature comprises the following steps: contacting the to-be-connected surfaces of the to-be-connected polyimine thermosetting material, and dropwise adding an aqueous solution of a connecting agent, the connecting agent being triethylene tetramine, decamethylene diamine, p-phenylenediamine, ethylenediamine or diethylenetriamine; and standing at room temperature to complete the connection of the polyimine thermosetting material. And the connection process is simple to operate, the conditions are mild, and the connection efficiency is 88-99.5%. The method can be used in the field of modular 3D printing.