139 results about "Mannich reaction" 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.

The invention relates to the technical field of well cementation materials and provides well cementation cement stone based on water-based benzoxazine resin as well as a preparation method and application of the well cementation cement stone. The well cementation cement stone is prepared from the following components in parts by mass: 400-600 parts of quartz sand, 4-6 parts of a retarder, 4-6 parts of a fluid loss agent, 1-2 parts of a suspension stabilizer, 1-2 parts of a dispersant, 4-6 parts of a high-temperature-resistant water-based benzoxazine monomer and 40-50 parts of water, and the high-temperature-resistant water-based benzoxazine monomer is prepared from a phenolic compound, primary amine and formaldehyde through Mannich reaction. Resin formed by the prepared benzoxazine monomer has improved mechanical properties at a high temperature of 150-200 DEG C, the mechanical properties and high temperature resistance of well cementation cement at a high temperature are significantly improved by filling pores of set cement and optimizing cement components, the benzoxazine monomer in a cement slurry system does not affect the fluidity of cement slurry, and the well cementation cement has a good application prospect. Meanwhile, the high-temperature strength of set cement can be remarkably enhanced, and the cement is suitable for well cementation of high-temperature deep wells.

The invention relates to the technical field of polyurethane coatings, and discloses a preparation method of an antibacterial wear-resistant waterborne polyurethane coating, which comprises the following steps: taking concentrated hydrochloric acid, p-phenylenediamine, sodium nitrite, paraformaldehyde, amino-modified nano silicon dioxide and hexamethylene diisocyanate as raw materials; the preparation method comprises the following steps: taking 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide as a raw material, carrying out diazotization coupling reaction, substitution reaction, Mannich reaction and addition reaction to prepare modified polyisocyanate, then taking 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and ((2-aminoethyl) azadiyl) dimethanol as raw materials, carrying out substitution reaction to prepare DOPO-based dihydric alcohol, and carrying out reaction to prepare the DOPO-based dihydric alcohol. Finally, the modified polyisocyanate, DOPO-based dihydric alcohol and polyethylene glycol 400 are used as raw materials, an antibacterial wear-resistant polyurethane emulsion is prepared through a prepolymerization reaction and a chain extension reaction, and the prepared polyurethane coating has good antibacterial, anti-ultraviolet, flame-retardant and wear-resistant properties.

The invention relates to the technical field of coatings, in particular to a corrosion-resistant coating material and a preparation method thereof. The corrosion-resistant coating material comprises the following components in parts by mass: 80-100 parts of epoxy resin, 5-20 parts of a modified phenolic aldehyde amine curing agent, 2-5 parts of a waterproof agent, 5-10 parts of a corrosion inhibitor and 40-55 parts of a lubricant. The modified phenolic aldehyde amine curing agent is obtained by carrying out Mannich reaction on phenol, thymol, aliphatic polyamine and formaldehyde. The phenol provides a rigid benzene ring structure, and endows a cured product with good heat resistance and chemical resistance. Thymol improves the flexibility and adhesive force of the cured product and enhances the hydrophobicity of the cured product at the same time. The epoxy resin and the modified phenolic aldehyde amine curing agent are polymerized, the waterproof agent, the corrosion inhibitor and the lubricant are wrapped, and the obtained coating material has good adhesive force and corrosion resistance.

The invention relates to the field of macromolecular surfactants, and discloses an agricultural macromolecular surfactant and a preparation method thereof. The preparation method comprises the following steps: introducing a plurality of hydrophilic polyethylene glycol side chains into sodium lignin sulfonate molecules by adopting an electrophilic substitution reaction to prepare novel anionic sodium lignin sulfonate polyoxyethylene ether, introducing a tetramethyl piperidylamine monomer by virtue of a Mannich reaction to synthesize novel hindered amine grafted sodium lignin sulfonate polyoxyethylene ether, the stable agricultural polymer surfactant is prepared by mixing a cationic surfactant hexadecyl trimethyl ammonium bromide and the cationic surfactant hexadecyl trimethyl ammonium bromide, and the agricultural polymer surfactant has strong surface activity, dispersing performance and photolysis resistance.

The invention relates to the technical field of insulating materials, and discloses a high-temperature-resistant polyvinyl chloride insulating material and application thereof in a cable, parachloroaniline, formaldehyde, bisphenol S, diethanol amine, phthalic anhydride and the like are used as raw materials, a Mannich reaction, a substitution reaction and a ring-opening polymerization reaction are performed to obtain phthalic anhydride polyester polyol, and the phthalic anhydride polyester polyol, 4, 4 '-diphenyl-1, 3-pentanediol, 4, 4'-diphenyl-1, 3-pentanediol and 4, 4 '-diphenyl-1, 3-pentanediol are used as raw materials to prepare the high-temperature-resistant polyvinyl chloride insulating material. The high-temperature-resistant polyvinyl chloride insulation material is prepared by taking 1, 4-diphenylmethane diisocyanate and 1, 4-butanediol as raw materials to obtain modified thermoplastic polyurethane, initiating crosslinking of the modified thermoplastic polyurethane, polyvinyl chloride resin and the like, and uniformly mixing the modified thermoplastic polyurethane, the polyvinyl chloride resin and the like to obtain the high-temperature-resistant polyvinyl chloride insulation material, and the prepared polyvinyl chloride insulation material has relatively good high-temperature resistance and wear resistance.

The invention discloses a preparation method of compound polysaccharide microspheres capable of releasing NO. The preparation method comprises the following steps: cross-linking swallow polysaccharide with L-ARG, and preparing L-ARG-containing swallow polysaccharide hydrogel through a Mannich reaction; then loading EGCG (epigallocatechin gallate) onto the L-ARG-containing swallow polysaccharide hydrogel through a Schiff base reaction, and obtaining the compound polysaccharide microspheres capable of releasing NO by utilizing an emulsification method. The invention also discloses an application thereof. The hydrogel microsphere capable of targeting the colon is prepared, and the hydrogel microsphere can be accurately exploded at the colon part after being swallowed. A dextran sodium sulfate (DSS)-induced IBD mouse model is established to test the drug effect, and the result shows that the compound polysaccharide microspheres have a remarkable treatment effect on DSS-induced ulcerative colitis, can obviously improve the symptoms of ulcerative colitis, and provides a theoretical basis and a clinical basis for new drugs for clinically preventing and treating ulcerative colitis.

The invention relates to the technical field of glass fiber reinforced plastics, and discloses a corrosion-resistant composite glass fiber reinforced plastic and a preparation method thereof. The preparation method comprises the following steps: carrying out Mannich reaction, reduction reaction and addition reaction on 2, 4 ', 4'-methylene triphenol, 5-aminoisophthalonitrile, formaldehyde, RaneyNi, 3-isocyanatopropyltriethoxysilane and the like which serve as raw materials to obtain benzoxazine polysilane, carrying out surface modification on basalt fibers and carbon fibers by using the benzoxazine polysilane to obtain modified hybrid fibers, and carrying out surface modification on the basalt fibers and the carbon fibers by using the modified hybrid fibers. P-fluorobenzaldehyde and aminopropyltriethoxysilane are used as raw materials, fluorine-containing silane is obtained through a Schiff base reaction, the fluorine-containing silane and hydroxyl on the surface of graphene oxide are subjected to a hydrolytic condensation reaction, fluorine-containing modified graphene oxide is obtained, finally, a curing agent, the modified hybrid fibers and the fluorine-containing modified graphene oxide are added into epoxy resin to be stirred and mixed to be uniform, curing is conducted, and the modified hybrid fibers are obtained. The corrosion-resistant composite glass fiber reinforced plastic is obtained. The composite glass fiber reinforced plastic prepared by the invention has excellent corrosion resistance, heat resistance and mechanical properties.

The invention relates to the technical field of adhesives, and discloses a preparation method of an epoxy resin adhesive, which comprises the following steps: reacting p-aminophenol with diphenyl dichlorosilane under the catalysis of triethanolamine to obtain di (p-aminophenoxy) diphenyl silane; the preparation method comprises the following steps: carrying out Mannich reaction on amino in di (p-aminophenoxy) diphenyl silane, amino in polyether amine, formaldehyde and phenol to obtain the silane-containing polyether amine type benzoxazine intermediate. And finally, uniformly mixing the silane-containing polyether amine type benzoxazine intermediate and epoxy resin, and curing to obtain the epoxy resin adhesive. The prepared silane-containing polyether amine benzoxazine intermediate contains a silane structure and a benzoxazine structure, both the silane structure and the benzoxazine structure have excellent heat resistance, and the epoxy resin adhesive prepared by adding the silane-containing polyether amine benzoxazine intermediate into epoxy resin has excellent heat resistance.

The invention relates to the technical field of polyurethane thermal insulation materials, and discloses a preparation method of a nano silicon dioxide modified polyurethane thermal insulation material.The preparation method comprises the steps that 4-chloro-1-butylamine, formaldehyde and bisphenol A serve as raw materials and are subjected to a Mannich reaction to obtain an intermediate 1, and the intermediate 1 and PEPA are subjected to a substitution reaction under catalysis of pyridine to obtain benzoxazine-based double PEPA. Taking N, N-diethyl-aminopropyl methyl dimethoxy silane as a bridge, carrying out quaternization reaction with the intermediate 1, and then carrying out condensation reaction with nano silicon dioxide to obtain the benzoxazine-based double-nano silicon dioxide. Finally, polyether polyol, benzoxazine-based double nano-silica, benzoxazine-based double PEPA, a curing agent and the like are used as raw materials, stirred and mixed to be uniform, foaming forming is conducted, and the nano-silica modified polyurethane thermal insulation material is obtained. The nano silicon dioxide modified polyurethane thermal insulation material prepared by the preparation method disclosed by the invention has relatively good flame-retardant effect, antibacterial effect, mechanical property and thermal stability.

The invention relates to the field of sedimentation flocculants, in particular to an emulsion type polymeric flocculant for aluminum oxide red mud sedimentation and a preparation method of the emulsion type polymeric flocculant. Utilizing Mannich reaction to access the intermediate, and bridging and cross-linking the intermediate between macromolecular chains; and carrying out hydroximation modification to obtain a complex cross-linked network structure polymer emulsion containing a bis-dithiocarbamate group, a hydroxamic acid group, an amide group and a carboxyl group. Hydroxamic acid groups adsorb iron ions in the red mud, bis-dithiocarbamate groups are introduced into an intermediate to strongly adsorb iron oxide and other metals in the red mud, and a bridging effect enables emulsion polymer chains to be crosslinked to form a more complex three-dimensional network conformation; through bridging adsorption, surface adsorption and charge adsorption, the solid-liquid separation efficiency in red mud sedimentation is greatly improved, and the sedimentation speed is remarkably improved.

The invention provides a high-toughness epoxy resin sizing material and a preparation method thereof. The sizing material comprises the following components: 100 parts of epoxy resin, 10-20 parts of a modified toughening agent, 5-20 parts of a modified curing agent, 10-20 parts of a diluent and 0.1-4 parts of an accelerant, the modified toughening agent is obtained by sequentially carrying out graft modification on the toughening agent by diisocyanate and an alcohol substance; the modified curing agent is obtained by modifying the curing agent through Mannich reaction of long-chain phenol and formaldehyde or paraformaldehyde; the modified curing agent and the modified toughening agent are connected through chemical bonds, so that a load absorption-transfer-resistance synergistic mechanism can be further formed, and the toughness and tensile strength of the epoxy resin are greatly improved.

The invention discloses lignin-based hard carbon and a preparation method thereof.The preparation method comprises the steps that triethylene tetramine is grafted to the surface of lignin through Mannich reaction, then dithio-amino is grafted to the surface of the lignin through esterification reaction, and the lignin-based hard carbon is obtained by grafting dithio-amino groups to the surface of the lignin. On one hand, the adsorption capacity of the lignin to metal ions is improved, and on the other hand, the electrochemical performance of the lignin is improved by doping N and S elements into the lignin; the rate capability of the hard carbon is related to the electronic conductivity of the hard carbon and the transmission rate of Na < + > in the hard carbon, the carbonization material and the crystalline flake graphite powder are blended, the electronic conductivity is improved, meanwhile, the layered structure of the crystalline flake graphite powder is beneficial to the transmission of Na < + >, and the performance of the hard carbon is improved. Furthermore, the electrochemical performance of the lignin-based hard carbon is further improved.

A method of reducing the emission of NOx, nitrogen oxide and / or nitrogen dioxide, from a diesel engine, comprising dosing a nitrogen containing detergent into diesel fuel. The nitrogen containing dete

The invention discloses a preparation method and application of a double-biomass carbon source coated ammonium polyphosphate intumescent flame retardant with a core-shell structure. Ammonium polyphosphate is used as a core, composite coating of chitosan and zinc stannate is achieved through an ion exchange reaction and a chelation reaction, then a lignin shell layer is introduced through a Mannich reaction, and the lignin and chitosan double-carbon-source coated intumescent flame-retardant antibacterial synergist is obtained. The flame retardant disclosed by the invention is simple and convenient in preparation process and high in safety, most of the raw materials are derived from green renewable biomass materials with low cost, and the flame retardant has environment-friendly characteristic and excellent polymer compatibility. The microcapsule surface modification technology enhances the interfacial interaction between the additive and the polymer matrix, systematic optimization of the flame retardant property of the composite material is realized, and when the flame retardant is used for modifying the TPU material, the molten drop phenomenon and a large amount of dense smoke generated in the combustion process can be effectively inhibited, and the TPU composite material can be endowed with excellent long-acting antibacterial property.

The invention discloses a chitin-based fluorescent film for Zr < 4 + > detection and a preparation method thereof. The material takes a chitin film as a substrate and is chemically modified in situ by a one-pot method. The method comprises the following steps: firstly, dissolving chitin in an alkali / urea system, preparing a chitin film through a tape casting method, and washing the film with deionized water until the pH value is neutral; then, a multi-component Mannich reaction is adopted, the chitin thin film obtained after hot pressing reacts with quercetin molecules and aldehyde compounds, and the modified covalent grafted chitin-based fluorescent thin film is obtained. Through introduction of quercetin molecules, the chitin film is endowed with fluorescence performance, and meanwhile, carbonyl and polyhydroxy structures of quercetin have the capability of easily forming strong complexes with metal ions, so that the modified chitin-based fluorescent film has the characteristic of quantitatively detecting the metal ions. The preparation method disclosed by the invention accords with green chemistry, is simple to operate and stable in performance, and can be used for rapidly and highly selectively detecting zirconium (IV) ions.

The present application relates to the technical field of polysaccharide modification, and specifically discloses amino acid modified astragalus polysaccharide, a preparation method thereof and antibacterial application. The present application uses astragalus polysaccharide, formaldehyde and specific amino acids as raw materials, and prepares amino acid grafted modified astragalus polysaccharide through a Mannich reaction. The amino acid grafting site only occurs on the fifth carbon of the sugar ring. Not only does this retain the amino and carboxyl groups of the amino acid, so that the biological activity of the amino acid is retained, but also the active carboxyl group of the astragalus polysaccharide can be retained, so that the antibacterial property of the synthesized amino acid modified astragalus polysaccharide is significantly improved, and broad-spectrum antibacterial property can be achieved. The amino acid modified astragalus polysaccharide has excellent antibacterial activity on gram-positive bacteria and gram-negative bacteria, is a green new type of efficient antibacterial material, and is expected to become a substitute for antibiotics. The amino acid modified astragalus polysaccharide has important significance for solving the problems of increasing bacterial drug resistance and environmental accumulation caused by antibiotics, and has good application prospect.

The invention discloses a lignin-based composite condensation water pipeline corrosion inhibition agent as well as a preparation method and application thereof. The lignin-based composite condensation water pipeline corrosion inhibition agent is prepared from the following raw materials: alkali lignin, a formaldehyde solution, an amine monomer, sodium molybdate and ethanolamine ascorbic acid. The preparation method comprises the following steps: dissolving alkali lignin in a solvent, adding a formaldehyde solution, sufficiently and uniformly mixing, slowly dropwise adding an amine monomer, carrying out Mannich reaction on the alkali lignin and the amine monomer at a certain temperature to obtain aminated lignin, and then cooling; after cooling is completed, sodium molybdate, ethanolamine and ascorbic acid are added into a system, continuous stirring is conducted, an obtained reaction solution is dried, and the lignin-based composite condensation water pipeline corrosion inhibition agent is prepared. The lignin-based composite corrosion inhibition agent for the condensed water pipeline is applied to be added into the condensed water pipeline to regulate and control the quality of condensed water, and a passive film is generated on the inner wall of the condensed water pipeline, so that the corrosion prevention of the condensed water pipeline is realized.

The invention relates to the technical field of fireproof materials, and discloses a thermoplastic polyurethane fireproof material and a preparation method thereof.The preparation method comprises the steps that 2-chloro-5, 5-dimethyl-1, 3, 2-dioxophosphoryl-2-oxide and hydroxyethyl acrylate are subjected to a substitution reaction under catalysis of triethylamine, and phosphorus-containing acrylate is obtained; the preparation method comprises the following steps: carrying out Mannich reaction on 4, 4 '-(1, 2, 4, 5-tetrazine-3, 6-diyl) diphenylamine, paraformaldehyde and o-allylphenol to obtain divinyl tetrazine benzoxazine; the preparation method comprises the following steps: carrying out a reaction on phosphorus-containing acrylate and divinyl tetrazine benzoxazine under the initiation copolymerization of ammonium persulfate to obtain the poly (phosphate-tetrazine benzoxazine) flame retardant. And finally, blending the poly (phosphate-tetrazine benzoxazine) flame retardant with polyurethane, and carrying out hot pressing to obtain the thermoplastic polyurethane fireproof material. The flame retardant prepared by the preparation method disclosed by the invention is applied to polyurethane and has excellent flame retardant property.

The present invention relates to the field of Mannich base synthesis, and specifically relates to a pyrazole-based ionic liquid 1,2-dibenzyl-3,5-dimethylpyrazolium salt and its synthesis method, and provides a method for catalyzing the Mannich reaction therewith; at room temperature, the pyrazole ionic liquid is used as a catalyst and a solvent, and an aromatic aldehyde, an aromatic amine and cyclohexanone are subjected to a three-component Mannich reaction, and the product and the catalyst are separated with ethanol to obtain the Mannich base β-aminoketone; by screening the types of ionic liquids, solvents, the molar ratios of reactants, the dosage of ionic liquids and reaction temperatures, a series of Mannich bases with higher yields are obtained under the optimized conditions, and the yields are in the range of 77% - 93%. Moreover, the catalyst used is green and effective, has good thermal stability, can catalyze the synthesis of Mannich bases in a short time, the product and the catalyst are easily separated, and the catalyst can be recycled multiple times without obvious reduction in activity.

The invention relates to a preparation method of a diformaldehyde gemini surfactant. Mannich reaction is adopted, a long-chain fatty amine component, glyoxal and sodium hydrogen sulfite are used as reaction raw materials, a single variable method is used for controlling reaction conditions, and the optimal conditions of the reaction are explored as follows: the reaction temperature is 60 DEG C, the reaction time is 5 h, and the molar ratio of glyoxal to sodium hydrogen sulfite is 1: 2.3. Then, all products are dissolved with trichloromethane, ethyl acetate is added into the solution to separate out the products, the products are treated through a secondary crystallization method, the product calculation yield is obtained, and the content of 1, 2-bis (dodecyl amino) ethane-1, 2-sodium disulfonate, 1, 2-bis (tetradecyl amino) ethane-1, 2-sodium disulfonate, 1, 2-bis (hexadecyl amino) ethane-1, 2-sodium disulfonate, 1, 2-bis (hexadecyl amino) ethane-1, 2-sodium disulfonate and 1, 2-bis (hexadecyl amino) ethane-1, 2-sodium disulfonate is measured. The synthetic yields of the 1, 2-sodium disulfonate are 65.8%, 67.5% and 76.8% respectively. And characterization is carried out through a nuclear magnetic resonance spectrometer and an infrared spectrometer.

The invention belongs to the technical field of catalysis, and particularly relates to a method for regulating and controlling water-phase Mannich reaction activity and enantiomer selectivity based on a Pickering emulsion interface. According to the method, a molecular catalyst is anchored on the surface of a solid emulsifier to form a stable Pickering emulsion system, and the activity and enantioselectivity of a water-phase Mannich catalytic reaction can be regulated and controlled by utilizing the interface characteristics of the Pickering emulsion system. According to the method, efficient utilization of the catalyst and precise regulation and control of the spatial configuration of the chiral product are achieved through the interfacial effect, the method is simple and easy to implement, the substrate application range is wide, and a new strategy is provided for green synthesis of chiral drugs and fine chemicals.

The invention relates to the technical field of coatings, and discloses a preparation method of a modified epoxy insulating coating, benzoxazinyl binary thiol is prepared through Mannich reaction, Michael addition reaction and esterification reaction, the benzoxazinyl binary thiol is novel in structure and good in symmetry, the benzoxazinyl binary thiol is used as a curing agent of epoxy resin, and the modified epoxy insulating coating can be used as a curing agent of epoxy resin. Compared with a common commercially available curing agent, the benzoxazine-based binary thiol prepared by the invention has better adhesion effect and high-temperature-resistant effect because the benzoxazine structure and the siloxane structure contained in the benzoxazine-based binary thiol improve the high-temperature-resistant performance of a coating, and the siloxane structure contained in the benzoxazine-based binary thiol is utilized to improve the adhesive force of a material; the wollastonite and the epoxy resin which are uniformly dispersed form an insulating network structure, so that the insulating property of the coating is improved, and the epoxy insulating coating prepared by the method has a wide application value in electronic equipment.

The invention discloses a water-based modified amine curing agent and a preparation method thereof. Cardanol is first epoxidized, then sodium bisulfite is used as a sulfonating agent to sulfonate the epoxidized cardanol, and then the sulfonated modified cardanol, polyamine, silane coupling agent KH-550 modified nano-silica and formaldehyde are subjected to a Mannich reaction to obtain a water-based modified amine curing agent. The water-based modified amine curing agent of the present invention is suitable for a water-based epoxy coating system, has the characteristics of good dispersibility and fast curing speed, and the coating formed after curing has excellent mechanical properties and anti-corrosion properties.

The present application belongs to the field of medicinal chemistry and pharmacotherapy, and particularly relates to a chalcone mannich base compound, a pharmaceutical composition and a preparation method and application thereof. The present application takes paeonol as a raw material, and obtains corresponding 3-substituted and 5-amino-methyl-substituted paeonol mannich base through mannich reaction of paeonol, polyoxymethylene and different organic amines. After the 3-substituted and 5-substituted paeonol mannich base is separated through column chromatography, the chalcone mannich base compound is obtained through Claisen-Schmidt reaction of the 3-substituted and 5-substituted paeonol mannich base and benzaldehyde containing different substituents. Experiments prove that the chalcone mannich base compound improves the physical and chemical properties of the chalcone mannich base and improves the drug efficacy, can solve the problem of poor water solubility, and has good anti-tumor cell proliferation activity.

The invention relates to the field of mineral processing, in particular to an ammoniated lignin biomass collecting agent and a preparation method and application thereof. The preparation method comprises the following steps: pretreatment, modification and extraction. The modification method comprises the following steps: stirring a lignin mixed solution, primarily heating to 50-60 DEG C, adding amino alkane (an amino alkane compound with a carbon chain length of 3-6), heating to 70-90 DEG C, dropwise adding an aldehyde additive for reaction, and cooling to obtain an ammoniated lignin modified solution. According to the preparation method, lignin is pretreated and activated through strong base, then treatment of'low-temperature amine adding-high-temperature aldehyde adding 'is carried out, it is guaranteed that the Mannich reaction is smoothly carried out, and therefore the ammoniated lignin biomass collecting agent is prepared. The modified lignin can significantly improve the collecting rate and selectivity of spodumene through electrostatic attraction and a synergistic effect of forming a chelate with aluminum ions on the surface of spodumene, has the advantages of environmental protection and low cost, and is suitable for a flotation separation process of spodumene ore.

The invention relates to the field of coatings, and discloses a high-temperature-resistant protective coating for an alloy surface and a preparation method of the high-temperature-resistant protective coating. The protective coating is prepared from waterborne epoxy resin, high-temperature-resistant filler, cardanol-based modified benzoxazine resin, a hyperbranched modifier, a curing agent and auxiliaries; according to the cardanol-based modified benzoxazine resin, paraformaldehyde is utilized to introduce an aldehyde group into a hydrogenated cardanol matrix to prepare a cardanol-based aldehyde-containing intermediate, then the cardanol-based aldehyde-containing intermediate reacts with 1, 5-naphthalene diamine, and then the cardanol-based aldehyde-containing intermediate reacts with gamma-aminopropyltriethoxysilane and paraformaldehyde through Mannich reaction to prepare the cardanol-based modified benzoxazine resin. The hyperbranched modifier is prepared by carrying out addition on 2, 4-dihydroxybenzophenone and isocyanatopropyltriethoxysilane, initiating hydrolytic condensation by utilizing a sol-gel method and then introducing triglycidyl isocyanurate to carry out a ring-opening reaction, and the protective coating prepared by the preparation method is strong in adhesive force, high in mechanical strength, good in wear resistance, good in wear resistance, good in wear resistance and good in wear resistance. Meanwhile, good corrosion resistance, high temperature resistance, ultraviolet aging resistance and flame retardance are achieved.

The application relates to the field of high-molecular surfactants, and discloses an agricultural high-molecular surfactant and a preparation method thereof. The preparation method comprises the following steps: introducing multiple hydrophilic polyethylene glycol side chains into a sodium lignosulfonate molecule by using an electrophilic substitution reaction to prepare a novel anionic sodium lignosulfonate polyoxyethylene ether, introducing a tetramethylpiperidinamine monomer by using a Mannich reaction to synthesize a novel hindered amine grafted sodium lignosulfonate polyoxyethylene ether, mixing a cationic surfactant hexadecyl trimethyl ammonium bromide with the hindered amine grafted sodium lignosulfonate polyoxyethylene ether to obtain a stable agricultural high-molecular surfactant, and the agricultural high-molecular surfactant has strong surface activity, dispersing performance and photolysis resistance.

A high-performance benzoxazine composite material and its preparation method are disclosed, relating to the design and manufacturing of flame-retardant benzoxazine composite materials. The composite material comprises a benzoxazine-based phase change material and a silane-crosslinked melamine-isonicotinic acid supramolecular aerogel (Si-MA / IA) encapsulating the benzoxazine-based phase change material. The benzoxazine-based phase change material is prepared by a Mannich reaction of phenolic compounds, octadecylamine, and paraformaldehyde. The Si-MA / IA is prepared by a crosslinking reaction of melamine (MA), isonicotinic acid (IA), and silica sol precursor, followed by freeze-drying. This invention prepares benzoxazine-based phase change materials (BZ-PCMs) through a Mannich reaction and encapsulates them in a silane-crosslinked melamine-isonicotinic acid supramolecular aerogel (Si-MA / IA). This composite material can form a stable char layer at high temperatures to prevent leakage, exhibits excellent synergistic flame-retardant effects, meets the requirements of sustainable development, and has broad application prospects.

The invention relates to the technical field of polyurethane foam materials, in particular to a preparation method of a phenolic hydroxyl-rich lignin derivative polyurethane flame-retardant foam material. The preparation method comprises the following steps: demethylating industrial lignin through an acidic molten salt system to obtain phenolic hydroxyl-rich lignin, carrying out Mannich reaction on the phenolic hydroxyl-rich lignin and 2NH2DOPO to prepare a DOPO lignin flame retardant LF, further pre-polymerizing the lignin flame retardant and PEG-400, carrying out condensation polymerization with 4, 4-MDI, foaming, and curing to prepare the polyurethane foam. According to the method, the phenolic hydroxyl concentration of the demethylated lignin derivative is regulated and controlled through an acidic molten salt system, and the Mannich reaction addition capacity of the lignin and 2NH2DOPO and the condensation capacity of the lignin as a reactive flame retardant are further evaluated according to the phenolic hydroxyl content of the lignin. The prepared polyurethane foam not only has flame-retardant and heat-insulating effects, but also has a certain pressure deformation recovery effect. Not only is the application prospect of the polyurethane foam material developed, but also a new way for renewable and sustainable high-value utilization of lignin is opened up.