48 results about "Mannich reaction" patented technology

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 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 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 discloses a hyperbranched modifier containing a benzoxazine phosphate structure, a flame-retardant composite material and application of the hyperbranched modifier and the flame-retardant composite material, and belongs to the technical field of organic chemistry. Daidzein, alkanolamine, paraformaldehyde and an organic solvent are mixed and dissolved and then subjected to a Mannich reaction at 90-120 DEG C for 8-24 h, a polyhydroxy benzoxazine intermediate is prepared and obtained, and then the hyperbranched modifier containing the benzoxazine phosphate structure, the flame-retardant composite material containing the benzoxazine phosphate structure and the flame-retardant composite material containing the benzoxazine phosphate structure are prepared. And uniformly mixing the polyhydroxy benzoxazine intermediate, triethylamine and an organic solvent, adding phosphorus oxychloride, and reacting at 0-30 DEG C for 24-48 hours to obtain the hyperbranched modifier containing the benzoxazine phosphate structure, which can improve the flame retardant property of the epoxy resin. An epoxy resin precursor, a hyperbranched modifier containing a benzoxazine phosphate structure and a curing accelerator are subjected to heating gradient curing to obtain a flame-retardant composite material cured product with the flame-retardant grade reaching V-0 grade and excellent impact resistance.

The application provides a lignin-based sulfur-supporting material for a lithium-sulfur battery and a preparation method and application thereof. The preparation method of the lignin-based sulfur-supporting material for the lithium-sulfur battery is as follows: first, grafting an amine compound with high nitrogen content into a lignin molecule through a Mannich reaction to obtain an aminated lignin; then, compounding the aminated lignin with CNTs and a transition metal salt, and carrying out high-temperature activation treatment on the obtained composite material to obtain a hierarchical porous transition metal / nitrogen co-doped lignin carbon-carbon nanotube composite material. The obtained composite material is applied to a lithium-sulfur battery, so that the cycle performance and rate performance of the battery are both significantly improved.

The application provides a rosin-based bio-based benzoxazine, a high-thermal-conductivity liquid crystal benzoxazine resin and a preparation method and application thereof. First, a binary phenol, an amine and paraformaldehyde are used as raw materials to obtain a double benzoxazine through a Mannich reaction; the double benzoxazine is subjected to an amidation reaction with an amino-containing rosin derivative to obtain a bio-based benzoxazine monomer. The bio-based benzoxazine monomer is subjected to thermal curing to obtain a benzoxazine resin containing a rosin side group. The benzoxazine resin containing the rosin side group has a liquid crystal structure, high heat resistance and high thermal conductivity, and has a good application prospect in the fields of integrated circuits, (LED) lighting and the like. The synthesis process of the application is simple, the reaction condition is mild, the yield is high, the equipment requirement is low, and the application is suitable for large-scale production.

The application relates to the technical field of insulating materials, and discloses a high-temperature-resistant polyvinyl chloride insulating material and application thereof in cables, which is prepared from p-chloroaniline, formaldehyde, bisphenol S, diethanolamine, phthalic anhydride and the like as raw materials through Mannich reaction, substitution reaction and ring-opening polymerization reaction to obtain phthalic anhydride polyester polyol, and then the phthalic anhydride polyester polyol, 4,4-diphenyl methane diisocyanate and 1,4-butanediol are used as raw materials to obtain modified thermoplastic polyurethane; the modified thermoplastic polyurethane is initiated and crosslinked with polyvinyl chloride resin and the like, is uniformly mixed, and the high-temperature-resistant polyvinyl chloride insulating material is obtained; and the polyvinyl chloride insulating material prepared by the application has good high-temperature resistance and wear resistance.

The invention relates to the technical field of high polymer materials, in particular to a one-step sequence-controlled hydroxy acid block copolyester preparation method, which comprises: carrying out amine catalysis on mandelic acid and bromoacetyl bromide in acetonitrile to form ester, cyclizing with sodium bicarbonate in N, N-dimethylformamide, and recrystallizing to obtain PDD; the preparation method comprises the following steps: carrying out Mannich reaction on 2, 4-di-tert-butylphenol to obtain a ligand H3L, complexing the ligand H3L with zirconium alkoxide, and carrying out methyl lactate treatment to obtain [ONOO]-Zr; pDD and epsilon-caprolactone are heated and polymerized in the presence of a [ONOO]-Zr catalyst, benzoic acid is terminated, and precipitation and purification are performed to obtain sequence-controlled block copolyester P (PDD-b-CL). Compared with other sequence-controlled block copolymer synthesis methods, the one-step sequence-controlled hydroxy acid block copolyester preparation method provided by the invention has the advantages of mild reaction conditions and simplicity and convenience in operation.

The invention relates to a scratch-resistant automobile film and a preparation method thereof, and belongs to the technical field of composite film materials. The vehicle film is of a multi-layer composite structure and sequentially comprises a pressure-sensitive adhesive layer, a TPU base film, a functional coating and a release film from inside to outside. The innovation is that the functional coating is formed by curing slurry containing a specific self-repairing anti-scratch agent, and the anti-scratch agent is prepared by reacting hydroxyl-terminated silicone oil with dichloromethylvinylsilane to form an alkenylation intermediate, then introducing an aldehyde group through mercaptoacetaldehyde click addition, and finally carrying out Mannich reaction with aminophenyl POSS (Polyhedral Oligomeric Silsesquioxane). Therefore, a composite structure of'POSS rigid core-dynamic imine bond-flexible thioether chain 'is constructed on an organic silicon side chain. Due to the structure, the coating has excellent scratch resistance, high light transmittance and efficient thermal stimulation response self-repairing capability.

The present invention relates to the technical field of camptothecin derivative preparation, particularly to a camptothecin derivative synthesis method, which uses 2-nitroacetophenone and isopropylamine as raw materials, and the camptothecin derivative is obtained through a Mannich reaction, a methylsulfonylation reaction, a nitro reduction reaction and a ring closing reaction. According to the synthetic method of the camptothecin derivative, the complex camptothecin derivative is split into two segments 1-(2-aminophenyl)-3-(N-isopropyl-N-methylsulfonylamino) propan-1-one and a compound V which are easy to prepare, and finally, a plurality of rings and chemical bonds are constructed simultaneously through one-step efficient ring closing reaction. The yield attenuation caused by progressive multiplication of the yield in the traditional linear synthesis is avoided, and the total yield is improved.

The invention relates to the technical field of chemical fertilizer anti-caking agents, and discloses an attapulgite-based chemical fertilizer anti-caking agent and a preparation method thereof.The preparation method specifically comprises the steps that urea, dimethyl phosphite, a formaldehyde aqueous solution, itaconic acid and tripotassium citrate serve as raw materials, and a Mannich reaction, a dehydration reaction and an esterification reaction are conducted in sequence to prepare an alkenyl nitrogen phosphorus potassium compound nutrition component; the preparation method comprises the following steps: carrying out ring-opening reaction on hydroxyl groups on the surface of attapulgite and epoxy groups in allyl glycidyl ether to prepare alkenylated attapulgite; the preparation method comprises the following steps: by taking alkenylated attapulgite and an alkenylated nitrogen-phosphorus-potassium compound nutrient component as main raw materials and N, N-methylenebisacrylamide as a cross-linking agent, preparing functionalized attapulgite by adopting a solution polymerization method under the action of an initiator; functionalized attapulgite and fatty alcohol-polyoxyethylene ether are used as raw materials and are mixed, ground and sieved to prepare the chemical fertilizer anti-caking agent. The fertilizer prepared by adding the chemical fertilizer anti-caking agent prepared by the invention shows excellent anti-caking performance.

This invention discloses an emodin-modified amine curing agent and its preparation method, as well as a long-lasting anti-corrosion coating based on bulk rust conversion, its preparation method, and its application. It relates to the field of anti-corrosion coating technology. The preparation method of the emodin-modified amine curing agent of this invention includes: subjecting raw materials including 2-hydroxyemodin, formaldehyde, and 1,5-pentanediamine to a Mannich reaction to obtain the emodin-modified amine curing agent. The emodin-modified amine curing agent used in this invention has a certain rust conversion ability and forms a stable chelate with iron ions, eliminating the need for rust conversion agents and allowing direct application to corroded surfaces. By using a suitable resin and curing agent system ratio, this invention can prepare a high-performance, low-surface-treatment, long-lasting anti-corrosion coating based on bulk rust conversion, applicable to manually cleaned surfaces (St2 / St3, ISO 8501-1), old coatings, high-pressure water jetting, and wet sandblasting substrate surfaces.

A method of reducing deposits in a diesel engine, the method comprising combusting in the engine a diesel fuel composition comprising a detergent additive which is not a quaternary ammonium salt or a Mannich reaction product; and a quaternary ammonium salt additive comprising the reaction product of nitrogen containing species having at least one tertiary amine group and a quaternizing agent; wherein the nitrogen containing species is selected from:(i) the reaction product of a hydrocarbyl-substituted acylating agent and a compound comprising at least one tertiary amine group and a primary amine, secondary amine or alcohol group;(ii) a Mannich reaction product comprising a tertiary amine group; and(v) a polyalkylene substituted amine having at least one tertiary amine group.

The invention belongs to the field of derivatization of natural products, and relates to a curcumin mannich hydrophilic derivative and a preparation method thereof. According to the method, dioxane / water is used as a reaction mixed solvent, amino acid is used as a hydrophilic structure to carry out hydrophilic modification of Mannich reaction on curcumin, and the purposes of improving the water solubility of curcumin, reducing the degradation degree and retaining an active structure are achieved. Dioxane can provide a mild Mannich reaction environment while serving as a good solvent to efficiently dissolve curcumin, so that the dual purposes of hydrophilic structure grafting and curcumin degradation degree reduction are achieved.

The invention relates to the technical field of high polymer materials, in particular to a high-temperature-resistant polymer material composition and application thereof. The composition comprises monomers such as polyethylene glycol (200) dimethacrylate, isobornyl acrylate and the like, Sadama UV (Ultraviolet) resin, a photoinitiator TPO (Thermoplastic Polyolefin) and a core functional molecule ((2-(5, 5, 5-trifluoro-1-methacrylamidopent-2-yl)-1H-benzo [d] imidazole-1-yl) methyl) phosphonic acid. The core functional molecules are prepared step by step through condensation cyclization, Michael addition, Mannich reaction, catalytic hydrogenation acylation and acidic hydrolysis, the composition and a main matrix material are mixed, a polymer microcrystalline layer with the thickness of 20 microns is formed through UV curing, and then the 3MDT dimming film is prepared. The film has excellent high-temperature-resistant stability, strong interface adhesion, rapid dimming response and good mechanical properties, can keep a stable dimming effect in a high-temperature environment, and is suitable for high-end scenes such as buildings and automobiles.

The application discloses a benzoxazine-containing amine curing agent, which comprises repeated daidzein-based benzoxazine structural units and can be prepared through a Mannich reaction. The application also discloses an epoxy resin composition, which comprises an epoxy resin precursor, the above-mentioned benzoxazine-containing amine curing agent and a curing accelerator. After gradient curing, the epoxy resin composition obtains an epoxy resin cured product. Compared with an epoxy resin cured product prepared by using a commonly used curing agent (4,4-diaminodiphenyl methane), the epoxy resin cured product prepared by using the benzoxazine-containing amine curing agent has a higher limiting oxygen index and reaches a V-0 level, and has excellent flame-retardant performance. Meanwhile, in a combustion experiment, the epoxy resin cured product prepared by using the benzoxazine-containing amine curing agent has a small total smoke release amount, a small maximum smoke density and a low CO generation amount, has a low smoke and toxicity characteristic, and is suitable for application fields with high heat resistance, high strength and flame-retardant low smoke and toxicity requirements.

The invention belongs to the technical field of carbon capture, and particularly relates to a high-efficiency low-energy-consumption carbon capture absorbent and a preparation method thereof. The preparation method comprises the following steps: protecting aminopyridine by using di-tert-butyl dicarbonate to obtain protected aminopyridine, then carrying out Mannich reaction on the protected aminopyridine, 2, 2, 3, 3, 4, 4, 5, 5-octafluorovaleraldehyde and 3-aminopropyltrimethoxysilane under the catalysis of acetic acid, and removing amino protection to generate an active agent; and grafting the active agent with the carrier through a silane chain segment to obtain the high-efficiency low-energy-consumption carbon capture absorbent. According to the invention, the adsorption capacity and the regeneration efficiency are synchronously improved, and the stability and the water vapor interference resistance of the adsorbent are also enhanced.

The invention discloses a preparation method of a piperidone compound. Specifically, the invention discloses a preparation method of a compound as shown in a formula III, which comprises the following step: in a solvent, under the action of organic alkali, carrying out Mannich reaction as shown in the specification on a compound as shown in a formula II, paraformaldehyde and methylamine salt to prepare the compound as shown in the formula III. According to the preparation method disclosed by the invention, the 2-methyl acetoacetate with low price is used as a raw material, the piperidone compound can be prepared at a relatively high yield under the condition of hectogram-level amplification, subsequent preparation of [(S)-(E)-4-fluoroalkenyl-1-methyl-3-methyl-3-piperidyl) methanol is facilitated, and the preparation method is suitable for industrial production.

The application belongs to the technical field of drilling fluid viscosity reducer, and particularly relates to a sulfonated crown ether-lignin copolymer and application thereof in drilling fluid viscosity reducer. The preparation method of the sulfonated crown ether-lignin copolymer comprises the following steps: sulfonated crown ether-lignin, propylene sulfonate and allyl polyethylene glycol are reacted in the presence of an initiator to obtain the sulfonated crown ether-lignin copolymer. Firstly, the nitrogen heterocyclic crown ether and the lignin are combined together through aldehyde by means of Mannich reaction, then the crown ether-lignin is sulfonated by means of sulfite, finally, the copolymerization reaction of the crown ether-lignin with propylene sulfonate and allyl polyethylene glycol is carried out, and finally the sulfonated crown ether-lignin copolymer is formed. The copolymer can improve the chelation of the system to calcium ions, and has good high-temperature stability, can greatly improve the resistance to divalent salt and temperature resistance of the filtrate reducer, can resist 8.0wt% CaCl2, and the temperature resistance can reach 240 DEG C.

The invention discloses a preparation method of a lignin supramolecular derived carbonaceous bimetallic compound, which comprises the following steps: modifying lignin by using ethylenediamine and formaldehyde through Mannich reaction to synthesize aminated lignin; enabling the aminated lignin, melamine and trithiocyanuric acid to form a lignin supramolecular precursor; and boric acid is added into the lignin supramolecular precursor for boron doping, then the vanadium-manganese compound is added, and then the lignin supramolecular derived carbonaceous bimetallic compound is obtained through hydrothermal treatment and carbonization. According to the invention, supramolecular synthesis, nonmetal doping and metal loading are realized, the electronic structure and the pore structure of the material are optimized, the ion diffusion resistance can be effectively reduced, the ion transmission efficiency is improved, and the comprehensive electrochemical performance of the lignin-derived carbon material in an aqueous zinc ion energy storage system is improved.

The application discloses ashless dispersants and a preparation method and application thereof. The ashless dispersant is a compound prepared through a Mannich reaction of a multifunctional polar crosslinking agent A containing multiple reaction sites, a single-hanging fatty amine type polyisobutylene succinimide B and / or a single-hanging polyether amine type polyisobutylene succinimide C, and a polyformaldehyde compound D. The ashless dispersant prepared by the application has a star-shaped structure as a whole, and the polyisobutylene olefin chain grafted at multiple sites makes the dispersant have stronger suspension capacity in oil products. In addition, the ashless dispersant prepared by the application has excellent dispersing performance, oxidation resistance and high-temperature detergency, and has excellent storage stability after being adjusted into oil products.

The invention relates to the field of dust removal filter bags, and discloses a polyester fiber dust removal filter bag and a preparation method thereof.The dust removal filter bag is prepared from modified polyester fibers and reinforced fibers through needling, the modified polyester fibers are prepared from PET slices and composite material through melt spinning, and the composite material uses DOPO-based benzoxazine derivatives as a matrix and graphene oxide as a reinforcement body; and chalcone-based benzoxazine is used as a coupling agent, and a solution blending method is adopted to prepare the composite material. The DOPO-based benzoxazine derivative is prepared by carrying out nucleophilic addition reaction on double-bond benzoxazine liquid and DOPO, wherein the double-bond benzoxazine liquid is prepared by carrying out Mannich reaction on allylamine, paraformaldehyde and cardanol; according to the chalcone benzoxazine, paeonol and terephthalaldehyde are subjected to a Claisen-Schmidt reaction to prepare a chalcone intermediate, and then the chalcone intermediate, gamma-aminopropyltriethoxysilane and paraformaldehyde are subjected to a Mannich reaction to prepare the chalcone benzoxazine. The dust removal filter bag prepared by the invention has good mechanical properties, high temperature resistance, flame retardance, antibacterial property and hydrophobicity.

The invention relates to the technical field of oilfield development, in particular to a purine Mannich base corrosion inhibitor, a completion fluid and preparation and application of the purine Mannich base corrosion inhibitor and the completion fluid. The preparation method of the purine Mannich base corrosion inhibitor comprises the following steps: adding aldehyde, ketone and purine into methanol, fully mixing and dissolving, adding concentrated hydrochloric acid into a reaction system, adjusting the pH value of the reaction system to 1-4, and carrying out Mannich reaction; and after the Mannich reaction is finished, cooling the reaction system to room temperature, removing the solvent in the system, recrystallizing and filtering to obtain the purine Mannich base corrosion inhibitor. The purine Mannich base corrosion inhibitor can adapt to the high-temperature condition of 200 DEG C or above, and has important significance on well completion operation of high-temperature deep wells and ultra-deep wells.

The invention discloses a composite phosphorus-free corrosion and scale inhibitor as well as a preparation method and application thereof, and relates to the technical field of scale inhibitor materials. The preparation method comprises the following steps: firstly, carrying out Mannich reaction on formaldehyde, bis (methoxysilylpropyl) amine and 7-hydroxycoumarin-3-carboxylic acid ethyl ester in an ethanol medium to prepare coumarin Mannich base, and then carrying out grafting reaction on the coumarin Mannich base and allyl glycidyl ether in methanol to prepare grafted coumarin Mannich base; finally, the intermediate, acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid are copolymerized in deionized water with ammonium persulfate-ferrous sulfate as a redox initiation system, and the composite phosphorus-free corrosion and scale inhibitor is prepared, has efficient corrosion and scale inhibition performance, can achieve comprehensive protection on carbon steel, brass and stainless steel, and has good corrosion and scale inhibition performance. The scale inhibitor is suitable for working conditions of high-hardness and high-alkalinity industrial circulating water, is phosphorus-free and environment-friendly, effectively overcomes the defects that a traditional phosphorus-free agent is single in function, poor in synergism, unstable in structure and poor in inhibition effect on scale types difficult to treat, and is excellent in industrial applicability.

This disclosure provides an epoxy resin-based curing agent that can be cured in humid environments and its preparation method. The preparation method includes: obtaining the epoxy resin-based curing agent by reacting cashew nut shell powder, formaldehyde source, m-phenylenediamine, and another amine compound through a Mannich reaction; wherein the other amine compound is triethylenetetramine or 2-methylpentanediamine. This invention uses cashew nut shell powder as the sole phenolic source, ensuring that Mannich substitution mainly occurs at the ortho / para positions while retaining the phenolic hydroxyl sites. Through its unique meta-15-carbon unsaturated straight chain (C15 chain), it greatly improves the enrichment degree of long-chain hydrophobic flexible side groups at the substitution ends and the interfacial water displacement capacity at the molecular level.

This invention discloses an active lignin, its preparation method, and its applications, belonging to the field of biomass polymer materials technology. Through the Mannich reaction, this invention successfully grafts highly reactive terminal amino polyether segments onto the phenylpropane backbone of lignin, fundamentally solving the application bottleneck of lignin and realizing the transformation from an "inert filler" to an "active monomer." On the one hand, the introduced flexible polyether chains improve the toughness and compatibility of lignin; on the other hand, the introduced primary amine group (-NH2) has much higher reactivity than the lignin's own hydroxyl group (-OH), and can participate as a highly efficient chain extender in the subsequent polyurea formation reaction. The active lignin is chemically bonded into the polymer network, not only fundamentally solving the compatibility and dispersibility problems, but also synergistically enhancing the mechanical properties and weather resistance of the final coating by utilizing the rigid aromatic ring structure of lignin and the newly introduced flexible segments.