440 results about "Paraformaldehyde" patented technology

The invention provides antioxidant copper powder for low-temperature slurry, low-temperature sintered copper slurry and a preparation method of the low-temperature sintered copper slurry, and belongs to the technical field of slurry for heterojunction batteries. The antioxidant copper powder comprises copper powder and a coating agent coating the surface of the copper powder; wherein the coating agent comprises acrylic acid, oleic acid and paraformaldehyde. The anti-oxidation copper powder is formed by coating the surface of the copper powder with the coating agent formed by the acrylic acid, the oleic acid and the paraformaldehyde, and the low-temperature sintering copper paste formed by matching the anti-oxidation copper powder with other components can realize low-temperature sintering in air, does not need a protective atmosphere and has good conductivity.

The invention provides well killing fluid for preventing carbon dioxide gas channeling and a preparation method and application thereof, and relates to the technical field of oil and gas exploitation. The kill fluid for preventing carbon dioxide gas channeling comprises polyethylene glycol, sodium humate, sodium lignin sulfonate and paraformaldehyde, polyethylene glycol is used as a main raw material, sodium humate, sodium lignin sulfonate and paraformaldehyde are compounded, polyethylene glycol cannot be degraded after encountering carbon dioxide acid gas, and the carbon dioxide gas channeling is prevented. Paraformaldehyde plays a role of a cross-linking agent in a well killing fluid solution, other raw materials are cross-linked together to form gel with a net-shaped body structure, and the viscosity of the well killing fluid is increased to prevent gas channeling. The well killing fluid for preventing carbon dioxide gas channeling is not affected by acid-base gas and not limited by unbalanced formation pressure, and when the well killing fluid encounters carbon dioxide gas, carbon dioxide can be rapidly captured, reacts with other raw materials in the well killing fluid and blocks a gas channeling layer.

The invention provides slick water fracturing fluid as well as a preparation method and application thereof. The slick water fracturing fluid comprises chitosan, a polymer matrix, paraformaldehyde and a solvent. In the slick water fracturing fluid provided by the invention, the chitosan and the polymer are fully dissolved, and the main chains of the two polymers are physically interpenetrated and wound. In the presence of paraformaldehyde, a polymer main chain is chemically crosslinked with paraformaldehyde to form a primary network structure. Then, chitosan and molybdenum disulfide can form coordination cross-linking sites, a secondary network structure is obtained, then a multi-network structure which cannot be split is formed, and the viscosity is high; moreover, the components have good solubility in the solvent, are easy to mix on line and are relatively low in preparation cost.

In order to solve the problems of low yield, complex process and difficulty in purification in the existing preparation method of benzodifurandione, the invention provides a preparation method of benzodifurandione, which comprises the following operation steps: synthesis of benzodifurandione: mixing hydroquinone, paraformaldehyde, a transition metal catalyst and a ligand under an acidic condition to obtain a mixture A; introducing CO, reacting at the temperature of 120-150 DEG C to obtain a mixture containing benzodifuran diketone, cooling and filtering to obtain a benzodifuran diketone solid; and purification: purifying the benzodifuran diketone solid to obtain the benzodifuran diketone. The preparation method provided by the invention is simple and convenient to operate, the obtained monomer benzodifuran diketone raw material is high in purity and stable in quality, and large-scale production of polymers can be realized.

The invention discloses an oil field desulfurizer and a preparation method thereof. The preparation method comprises the following steps: dissolving 1, 3-propane sultone in toluene, dropwise adding equimolar 1-methylimidazole under an ice-water bath, and heating to room temperature for reaction after dropwise adding; separating out a product after the reaction is finished, and dropwise adding equimolar concentrated sulfuric acid to obtain imidazole ionic liquid; mixing the imidazole ionic liquid with a catalytic promoter to obtain a catalyst; the preparation method comprises the following steps: adding paraformaldehyde, a triazine compound and a catalyst into a solvent, heating to 50-90 DEG C, controlling a reflux reaction for 6-9 hours, and after the reaction is finished, carrying out reduced pressure distillation to remove the solvent and separate out the catalyst, thereby obtaining the oil field desulfurizer. The desulfurizer is a modified triazine compound with a novel structure, N and lateral branch functional groups on a triazine ring of the desulfurizer can react with hydrogen sulfide, and compared with a conventional triazine desulfurizer, a plurality of desulfurization points are added, so that the sulfur capacity is greatly improved.

The invention relates to the technical field of biology, in particular to a sample preservation solution for vagina micro-ecology detection and a preparation method of the sample preservation solution. The invention relates to a sample preservation solution for vaginal micro-ecology detection. The sample preservation solution comprises the following components in percentage by mass: 0.5-0.9% of paraformaldehyde, 0.08-0.12% of glutaraldehyde, 10-18% of a buffer solution, 0.1-0.4% of inositol, 1-10% of a stabilizer, 0.8-5% of a cell treatment agent and the balance of water, the stabilizing agent is prepared from sodium alginate, tween-20 and beta-cyclodextrin. The invention aims to solve the problems of high false negative and false positive rate or difficulty in interpretation caused by liquid-based cell accumulation, unstable subsequent dyeing and decoloration time and the like of a cell preservation solution in the prior art, so that the sample preservation solution for sample cells can keep the forms of cells, protozoa and the like unchanged, and ensures that gram staining negative and positive properties of bacteria and fungi are not changed. The staining and decoloring are relatively stable, the false negative and false positive rate of sample cell detection is effectively reduced, and the sample cell lesion detection and judgment are more accurate.

The invention discloses a recoverable benzoxazine / fiber composite material and a preparation method thereof, and belongs to the technical field of composite materials. The composite material is obtained by hot-pressing and curing degradable benzoxazine containing boric acid ester and fibers according to the mass ratio of 1: (0.1-0.8), the degradable benzoxazine containing the boric acid ester is obtained by reacting diphenol containing a boric acid ester structure, long-chain monoamine and paraformaldehyde according to a molar ratio of 1: 2: (4.1-4.4). The composite material prepared by the invention is obtained by hot-pressing and curing the degradable benzoxazine containing boric acid ester and the fiber, and the reversible boric acid ester bond endows the benzoxazine with excellent degradability and endows the composite material with excellent recoverability, so that the fiber can be reused. In addition, the composite material contains boron element, so that the composite material has excellent flame retardant property. The prepared composite material has wide application prospects in the fields of buildings, traffic, military industry and the like.

The invention discloses a halogen-free flame-retardant benzoxazine-epoxy / aramid fiber composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material is obtained by heating and curing main chain type phosphorus-containing benzoxazine, epoxy resin and aramid fiber according to the mass fraction ratio of (1%-50%): (40%-70%): (30%-70%); the main chain type phosphorus-containing benzoxazine is prepared by carrying out Mannich condensation reaction on phosphorus-containing diamine, bisphenol and paraformaldehyde according to the molar ratio of 1: 1: (4.1-4.4). According to the prepared composite material, main chain type phosphorus-containing benzoxazine modified epoxy resin serves as a matrix, the matrix and aramid fibers are subjected to heating curing to prepare the composite material, benzoxazine is crosslinked with the aramid fibers and the epoxy resin when subjected to ring opening polymerization, the interface bonding performance between the aramid fibers and the epoxy resin can be remarkably improved, and the composite material can be used for preparing the aramid fibers and the epoxy resin. The mechanical property of the composite material can be effectively improved; meanwhile, benzoxazine contains phosphorus, so that the flame retardant property of the composite material can be improved, and the application field of the aramid fiber composite material is expanded.

The invention relates to a high-temperature-resistant low-dielectric high-strength benzoxazine intermediate and a preparation method of benzoxazine, and belongs to the field of functional polymer materials. The method comprises the following steps: adding paraformaldehyde, unsaturated bond-containing dihydric phenol, a monohydric phenol compound and a diamine compound into a reactor, adding a solvent, reacting at 85-110 DEG C for 8-12 hours, after the reaction is finished, obtaining a benzoxazine intermediate through a purification process, and fully drying the benzoxazine intermediate for later use; and reacting the benzoxazine intermediate at 120-230 DEG C for 8-20 hours to obtain the polybenzoxazine resin.

The invention relates to the technical field of flame retardants, and discloses a halogen-free flame retardant, a preparation method and application of the halogen-free flame retardant in plastics. The preparation method comprises the following steps: synthesizing modified DOPO by taking DOPO, p-hydroxybenzaldehyde and phenol as raw materials, and mixing the modified DOPO with propargylamine and paraformaldehyde for reaction to obtain dialkynyl benzoxazine; the preparation method comprises the following steps: grafting dialkynyl benzoxazine and 1-azido adamantane through a click chemical reaction to obtain flame-retardant benzoxazine; the halogen-free flame retardant is obtained by carrying out in-situ polymerization on flame-retardant benzoxazine on the surface of the ammonium polyphosphate / molecular sieve composite material. The halogen-free flame retardant is excellent in flame retardant effect and good in compatibility in a matrix material, can effectively improve the flame retardant property and the mechanical property of the matrix material, and can be applied to plastic materials.

The present invention relates to the technical field of benzoxazine resins, and discloses a halogen-free copper-clad laminate substrate material containing flame-retardant modified benzoxazine resin and a preparation method thereof, wherein the present invention utilizes 1,2,4,5-benzenetetramine and phosphorus oxychloride to carry out chlorination reaction to obtain intermediate product 1, and then it is subjected to substitution reaction with p-hydroxybenzaldehyde to obtain intermediate product 2, and the aldehyde group contained therein is subjected to Schiff base reaction with 3-aminophenoxyphthalonitrile to obtain intermediate product 3, and under the catalytic reduction of Raney nickel, phosphorus-containing polyamine is obtained, and finally it is subjected to Manniene reaction with bisphenol A and polyformaldehyde to obtain a flame-retardant modified hyperbranched benzoxazine resin, and finally it is stirred and mixed evenly with E-51 epoxy resin, N, N-dimethylbenzylamine, etc., and coated on glass fiber cloth, and cured to obtain a halogen-free copper-clad laminate substrate material containing flame-retardant modified benzoxazine resin. The halogen-free copper-clad laminate substrate material prepared by the present invention has good flame retardancy, thermal stability and mechanical properties.

The invention discloses a lignin-based epoxy anticorrosive paint and a preparation method thereof. The anticorrosive paint is prepared by mixing a lignin-based epoxy anticorrosive paint component, a lignin-based phenolic amine curing agent and a diluent. According to the lignin-based epoxy anticorrosive paint disclosed by the invention, on one hand, a lignin epoxy resin acetylation modification method based on lipase is introduced, and the content of hydrophilic groups is reduced, so that formation of a compact lignin cross-linked network structure is promoted, and the barrier ability, heat resistance and aging resistance of an anticorrosive coating on a chemical medium are improved on the resin level; on the other hand, lignin and furfural are respectively used for partially replacing phenol and paraformaldehyde to prepare a lignin-based phenolic aldehyde amine curing agent with high chemical inertness, so that the protection effect of a coating in an extreme corrosion environment and the adhesive force to a metal base material are improved on the curing agent level. The lignin-based epoxy anticorrosive paint prepared by the invention has good corrosion resistance, aging resistance, thixotropy and adhesive force.

The invention discloses a fixing reagent and method for double-color fluorescence detection of an anti-NMDAR antibody and application, the fixing reagent comprises paraformaldehyde and a mixture of methanol and acetone, and the mixture comprises 10-25% by volume of methanol, 75-90% by volume of acetone, 10-25% by volume of paraformaldehyde, 10-25% by volume of paraformaldehyde and 10-25% by volume of paraformaldehyde. The fixing effect is better by adopting paraformaldehyde with the mass-volume ratio concentration of 4% and a mixture of methanol with the volume fraction of 15% and acetone with the volume fraction of 85% in two steps. By adopting the fixing liquid and the fixing method, the antigenicity of NMDAR cannot be damaged, obvious green fluorescence cells can be seen in a positive sample, red fluorescence quenching is avoided, and co-localization of red fluorescence and green fluorescence can be observed by using a fluorescence microscope.

The invention discloses a triazine desulfurizer and a preparation method thereof, and belongs to the technical field of gas purification. The triazine desulfurizer is mainly prepared from the following raw materials in percentage by weight: 20 to 50 weight percent of triazine derivative, 10 to 15 weight percent of sterically hindered amine, 3 to 7 weight percent of stabilizer, 1 to 3 weight percent of synergist, 0.5 to 1.5 weight percent of penetrant, 0.5 to 1.5 weight percent of inhibitor, 1 to 2 weight percent of additive and the balance of water, the preparation method of the triazine derivative comprises the following steps: adding 2-(diphenylphosphino) ethylamine into a toluene solvent, adding a paraformaldehyde aqueous solution in batches under a stirring condition, and reacting for 2-8 hours to obtain the triazine derivative. According to the triazine desulfurizer and the preparation method thereof provided by the invention, the triazine derivative and the sterically hindered amine are taken as a host, and the stabilizer, the synergist, the penetrant, the inhibitor and the assistant are compounded, so that the scaling trend of the triazine desulfurizer in an oil and gas well can be slowed down, the dissolution rate of hydrogen sulfide and the mass transfer rate in a solution are increased, and the desulfurization reaction is promoted; the desulfurization effect and the desulfurization rate are improved, and meanwhile, a very good scale inhibition effect is also achieved.

The invention provides a preparation method of 2, 5-disubstituted benzyl chloride, and belongs to the technical field of preparation of drug intermediates. The chloromethyl solution is prepared from concentrated hydrochloric acid and paraformaldehyde, the concentration of hydrochloric acid is gradually reduced along with the reaction, and the reaction progress is slow due to the reduction of the concentration of concentrated hydrochloric acid; therefore, the chloromethylation reaction is carried out on the chloromethyl liquid and the disubstituted benzene in the hydrogen chloride gas, and the hydrogen chloride gas is supplemented, so that the concentration of the hydrogen chloride is increased, and the chloromethylation reaction is accelerated; meanwhile, a gradient heating mode is adopted, disubstituted benzene and chloromethyl liquid are subjected to chloromethylation reaction for 2-3 hours at the temperature of 50-60 DEG C, and the temperature is increased to 70-80 DEG C after the concentration of hydrogen chloride is reduced, so that the chloromethylation reaction is accelerated again, and the yield of the product is increased. According to the method, the volatilization and consumption of concentrated hydrochloric acid can be reduced, the generation of wastewater is reduced, the reaction time is shortened, and meanwhile, the yield of 2, 5-disubstituted benzyl chloride is also improved.

The invention discloses a method for synthesizing 2-vinylpyridine by a one-pot method, which comprises the following step: by taking 2-methylpyridine and paraformaldehyde as raw materials and water as a solvent, synthesizing the 2-vinylpyridine by a one-pot reaction under the catalysis of a basic catalyst. According to the invention, 2-methylpyridine and paraformaldehyde are taken as initial raw materials, the raw materials are simple and easy to obtain, the production cost is reduced, and water is taken as a solvent, so that the use of a large amount of organic solvents is avoided, and the influence on environmental pollution is small. In the reaction, a basic catalyst such as triethylamine is used as a catalyst, a small amount of sodium hydroxide solid is added in the reaction process, the basic catalyst enables the whole system to be in an alkaline environment, and sodium hydroxide improves the depolymerization efficiency of paraformaldehyde and promotes the dehydration process of the reaction, so that the selectivity and yield of 2-vinylpyridine are improved.

The invention provides a continuous production method of chloromethyl ethyl ether, and relates to the field of chloromethyl ethyl ether. The continuous production method of the chloromethyl ethyl ether comprises the following steps: depolymerization, first-stage gas-liquid reaction, second-stage microchannel reaction and third-stage pipeline reaction. The continuous production method of chloromethyl ethyl ether effectively avoids the defects of low hydrogen chloride throughput, long reaction time and low production efficiency in the batch-type reaction process, and overcomes the problems of low mass transfer efficiency, low reaction speed and high production energy consumption of heterogeneous reaction of paraformaldehyde, ethanol and hydrogen chloride gas; and on the basis of realizing continuous production of the chloromethyl ethyl ether, the purity and the yield of the continuously prepared chloromethyl ethyl ether are further improved.

The invention discloses a preparation method of an intrinsically flame-retardant and toughened polystyrene copolymer. The preparation method comprises the following steps: firstly, preparing a phosphorus-nitrogen integrated functional compound from glycine, paraformaldehyde and dimethyl phosphite as raw materials; then carrying out acylating chlorination modification on the phosphorus-nitrogen integrated functional compound by using thionyl chloride; reacting the phosphorus-nitrogen integrated functional compound modified by acylating chlorination with phenolic hydroxyl cardanol to prepare a high-flexibility flame-retardant monomer; and finally, reacting the high-flexibility flame-retardant monomer with styrene to obtain the polystyrene copolymer. The copolymer has the dual advantages of flame retardance and toughening at the same time.

The invention discloses a strong acid and alkali resistant plastic material for fume hood surface decoration and a preparation method of the strong acid and alkali resistant plastic material, belongs to the technical field of plastic material processing, and aims at solving the technical problem that in the prior art, the acid and alkali resistance and the bending modulus of a plastic material for fume hood surface decoration need to be further improved. The preparation method specifically comprises the following steps: stirring amino-modified fluorosilicone resin, paraformaldehyde and 1, 4-dioxane in a reaction kettle, dropwise adding an anacardol solution, heating the reaction kettle to 85-95 DEG C, carrying out heat preservation reaction for 6-8 hours, and carrying out post-treatment to obtain the anacardol-based benzoxazine resin. Perfluoro-modified polysiloxane benzoxazine is prepared, naphthalene-containing epoxy resin and imidazole-modified silicon carbide microspheres are compounded, in-situ catalysis synergistic curing is carried out by using filler interface imidazole, a compact organic-inorganic hybrid interpenetrating network is constructed, and the strong acid and alkali corrosion resistance and bending modulus of the material are remarkably improved.

The invention relates to a preparation method of a polyester film based on full-hydroxyl column [5] arene. The polyester film with salt separation is prepared by taking full-hydroxyl column [5] arene as a water-phase monomer through an interfacial polymerization method. The method comprises the following steps: (1) synthesizing methoxy pillar [5] arene from 1, 4-dimethoxybenzene and paraformaldehyde under the catalysis of boron trifluoride diethyl etherate; (2) reacting the purified product with boron tribromide, and removing methyl groups to obtain full-hydroxyl column [5] arene; (3) dissolving the product in an aqueous solution containing triethylamine, and forming a two-phase solution of interfacial polymerization reaction with an n-hexane solution of trimesoyl chloride; and (4) sequentially coating the surface of the polyacrylonitrile ultrafiltration membrane with the aqueous phase solution and the organic phase solution, and carrying out interfacial polymerization reaction to obtain the polyester membrane. Based on the inherent cavity and polyhydroxy characteristics of the full-hydroxyl column [5] arene, compared with a traditional polyamide membrane, the obtained polyester membrane has high permeability and selectivity, can efficiently separate dye and inorganic salt, and is suitable for water treatment processes of printing and dyeing wastewater and the like.

The invention discloses a smoke-suppression flame-retardant ecological board and a preparation method thereof. The ecological board comprises a base material, a flame-retardant adhesive layer and a facing layer which are sequentially stacked, wherein the flame-retardant adhesive layer is prepared from the following raw materials: 100 parts of urea-formaldehyde resin, 10-15 parts of a phosphorus-nitrogen composite flame retardant and 5-10 parts of flame-retardant filler; the preparation method of the phosphorus-nitrogen composite flame retardant comprises the following steps: carrying out an aminomethylation reaction on p-hydroxybenzoic acid, ethanolamine and paraformaldehyde which are used as raw materials in a molar ratio of 1: (1-1.2): (2-2.2) to prepare a Mannich base intermediate; and carrying out substitution reaction on the Mannich base intermediate and phosphonitrilic chloride trimer serving as raw materials according to the molar ratio of (3-7): 1. The phosphorus-nitrogen flame retardant disclosed by the invention is high in content of phosphorus and nitrogen elements and uniform in distribution ratio, and has more excellent synergistic smoke suppression and flame retardant effects compared with an existing physical compound system.

The invention relates to the field of sponge materials, and provides a flame-retardant sponge material as well as a preparation method and application thereof. The flame-retardant flame-retardant coating is prepared from the following components: phosphorus-based flame retardant modified oxidized feather-shaped carbon nanotubes, phosphorus-containing diol modified silicon dioxide aerogel, polyurethane, aluminum hydroxide, ammonium tripolyphosphate, toluene diisocyanate, deionized water, cyclopentane, triethanolamine, dibutyltin dilaurate, epoxidized soybean oil, talcum powder, an antioxidant, a light stabilizer, pigment and antimony trioxide. The composite material is prepared from expanded graphite, a silicone oil surfactant, an isothiazolinone antibacterial agent and a phosphorus-based flame retardant modified oxidized feather-shaped carbon nanotube through wet oxidation and dimethyl methylphosphonate modification, and phosphorus-containing diol is prepared from diethyl phosphite, diethanol amine and paraformaldehyde through condensation. The sponge disclosed by the invention has excellent mechanical and flame-retardant properties, and is widely applied to the fields of buildings, home furnishing and transportation.

A preparation method of allyl hyperbranched benzoxazine modified bismaleimide resin belongs to the technical field of polymer material preparation, and comprises the following steps: reacting allyl-containing diphenol, a triamine compound and paraformaldehyde under certain conditions to synthesize allyl-containing diphenol-triamine type hyperbranched benzoxazine, and reacting to obtain the allyl-containing diphenol-triamine type hyperbranched benzoxazine modified bismaleimide resin. The allyl hyperbranched benzoxazine modified bismaleimide resin, a bismaleimide monomer and diallyl bisphenol A are subjected to copolymerization modification, and the toughened and modified allyl hyperbranched benzoxazine modified bismaleimide resin is prepared. Compared with traditional diallyl bisphenol A modified bismaleimide resin, the prepared allyl hyperbranched benzoxazine modified bismaleimide resin has the advantages that the tensile strength and the bending strength are improved, the toughness is improved, and meanwhile, the good heat resistance is kept.

The invention discloses a method for synthesizing loxoprofen sodium by using a resin catalyst, and belongs to the field of medical chemical synthesis. The preparation method comprises the following steps: synthesizing 2-methylene cyclopentanone through methylenation reaction of cyclopentanone, paraformaldehyde and amine; the preparation method comprises the following steps: reacting 4-halogenated phenylacetate with methyl iodide to synthesize 2-(4-halogenated phenyl) propionate; a target intermediate 2-(4-((5-oxocyclopentyl-1-alkenyl) methyl) phenyl) propionate is generated through a Heck coupling reaction; further reducing to 2-(4-((2-oxygen cyclopentyl) methyl) phenyl) propionate through a catalytic hydrogenation reaction; and finally, carrying out a salt forming reaction to obtain loxoprofen sodium. The method adopts the self-made resin catalyst, is efficient and environment-friendly, has good yield and purity, and is suitable for industrial production.

The invention discloses a phosphorus-nitrogen synergistic flame-retardant benzoxazine / epoxy resin composite material and a preparation method thereof. Firstly, a phenolic compound and DOPO react to generate an intermediate product, and then the intermediate product, an amine compound and paraformaldehyde are subjected to a dehydration condensation reaction to generate the phosphorus-nitrogen synergistic flame retardant benzoxazine. The phosphorus-nitrogen synergistic flame-retardant benzoxazine is added into epoxy resin for thermocuring to obtain the composite material. The prepared benzoxazine flame retardant contains phosphorus and nitrogen elements, the nitrogen-based flame retardant has the advantages of low pollution, low smoke, good compatibility with EP and the like, and a quenching effect, a dilution effect and a carbon layer barrier effect can be generated in the combustion process to prevent further combustion of flames. The composite material has better flame retardant property, can effectively reduce the risk of fire hazard caused by overheating or short circuit of equipment, and ensures the safe and stable operation of energy equipment.

The invention relates to a Zr-MOF-based functional flame retardant and a preparation method and application thereof, zirconium oxychloride, amino-containing dicarboxylic acid, organic acid and water are mixed, the molar ratio of zirconium oxychloride to amino-containing dicarboxylic acid is 1: 1, the mass ratio of organic acid to water is x: (100-x), 1 < = x < = 40, stirring reaction is carried out at 50-100 DEG C for 0.5-12 h, paraformaldehyde and a phosphorus-containing flame retardant are added, stirring reaction is carried out at 50-100 DEG C for 0.5-12 h, and the Zr-MOF-based functional flame retardant is obtained. Wherein the molar ratio of the amino-containing dicarboxylic acid to the paraformaldehyde to the phosphorus-containing flame retardant is 1: (1-2): (1-2), the molar ratio of the paraformaldehyde to the phosphorus-containing flame retardant is 1: 1, then continuously reacting for 4-8 hours at the temperature of 70-100 DEG C, and after the reaction is finished, filtering, washing and drying to obtain the Zr-MOF-based functional flame retardant.

The invention discloses fireproof flame-retardant phenolic resin and a preparation method thereof, and relates to the technical field of high polymer materials. When the fireproof flame-retardant phenolic resin is prepared, firstly, alkali lignin is depolymerized in a lithium bromide solution, and depolymerized lignin is prepared; carrying out multi-component reaction on the depolymerized lignin, amino-terminated polydimethylsiloxane, isonitrile diethyl methylphosphate and glacial acetic acid to prepare modified lignin; the preparation method comprises the following steps: carrying out reaction modification on montmorillonite and diisocyanate to prepare isocyanate modified montmorillonite; the isocyanate modified montmorillonite and 3-aminopropyltriethoxysilane are subjected to a reaction, and modified montmorillonite is prepared; and polymerizing phenol with the modified lignin, paraformaldehyde and modified montmorillonite, and discharging to obtain the fireproof flame-retardant phenolic resin. The prepared fireproof flame-retardant phenolic resin has the advantages of flame retardance, good toughness, high strength and aging resistance.

The invention relates to the technical field of organic catalysis, in particular to a method for preparing glycolaldehyde by catalyzing formaldehyde hydroformylation. The method comprises the following steps: introducing CO and H2 into a mixed solution of paraformaldehyde, a rhodium compound, a ligand and a solvent, and reacting to prepare glycolaldehyde, the ligands comprise a ligand 1 and a ligand 2; the ligand 1 is selected from one or more of compounds as shown in the following L1-L8: # imgabs0 #; the structural formula of the ligand 1 is as shown in the specification, the structural formula of the ligand 2 is as shown in the specification, namely # imgabs1 # or # imgabs2 #, R1 is H, (CH2) ACH3, O-(CH2) ACH3, X or CX3, the value range of A is 0-3, and X is a halogen atom. According to the method disclosed by the invention, different ligands are subjected to dominant combination and cooperate with the rhodium-based catalyst, so that glycolaldehyde is obtained with high conversion rate and high selectivity under relatively mild conditions.

The invention provides a method for preparing p-chloromethyl styrene, which comprises the following steps: (1) in the presence of a catalyst and an assistant, carrying out reaction on paraformaldehyde and hydrogen chloride to obtain a chloromethylation reagent; (2) reacting beta-halogenated ethyl benzene with the chloromethylation reagent obtained in the step (1) to obtain chloromethyl halogenated ethyl benzene; (3) adding an extracting agent into the chloromethyl halogenated ethylbenzene reaction liquid obtained in the step (2) for extraction to obtain an oil layer containing chloromethyl halogenated ethylbenzene and a water-containing acid layer, and crystallizing the oil layer to obtain purified p-chloromethyl halogenated ethylbenzene; and (4) in the presence of a solvent, carrying out elimination reaction on the purified p-chloromethyl halogenated ethyl benzene and alkali to obtain p-chloromethyl styrene.

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.