319 results about "Isocyanic acid" patented technology

The invention discloses a preparation method and application of a conductive polypyrrole compound. The preparation method comprises the following steps: (1) preparing an emulsion system; (2) adding an oxidizing agent; (3) diluting and dropwise adding monomer pyrrole, and reacting for 6-24 hours; and (4) washing the product, and applying the product to preparation of the foamed conductive polyurethane foam. Comprising the following steps: 1, filtering a conductive polypyrrole compound; 2, carrying out synthesis post-treatment on the conductive polypyrrole compound; 3, effectively mixing the polypyrrole compound with a commercial polyurethane foaming component (firstly premixing with an isocyanate-containing component or a polyol-containing component, and then effectively mixing with another polyol-containing component or an isocyanate-containing component); and 4, carrying out one-time forming foaming to obtain the conductive product. The preparation method has the advantages that better dispersion can be realized by synthesizing the conductive polypyrrole compound which is microcosmically in a nano-scale dendritic shape, and the use amount of a conductive material is reduced; the foamed conductive polyurethane foam is simple and convenient to construct, can be foamed instantly, has high foaming rate, retains the original mechanical properties by more than 50%, and has good conductivity.

Provided herein is a process for preparing compound A comprising (a) admixing 2-isopropyl-4-methylpyridin-3-amine (Compound B), or a salt thereof, a first base, and a reactive compound comprising phosgene or a phosgene equivalent in an organic solvent to form 3-isocyanato-2-isopropyl-4-methylpyridine (Compound C); (b) admixing Compound C and 2,6-dichloro-5-fluoronicotinamide (Compound D) to form 2,6-dichloro-5-fluoro-N-((2-isopropyl-4-methylpyridin-3-yl)carbamoyl)nicotinamide (Compound E); and (c) admixing Compound E and a second base to form a product mixture comprising Compound A and the second base. Also provided herein is a process for synthesizing AMG 510 comprising using Compound A prepared according to the disclosed processes

The invention relates to the field of plastic bags, and discloses a biodegradable plastic bag and a preparation method thereof, the biodegradable plastic bag comprises polylactic acid, poly (butylene adipate-co-terephthalate), a functional additive, modified starch, a lubricant and an antioxidant; the functional additive is prepared by grafting hydroxylated modified castor oil and isocyanated montmorillonite loaded titanium dioxide; the hydroxylation modified castor oil is prepared by modifying castor oil with chloroethyl isocyanate, then reacting with N-allylimidazole, and then reacting with 6-mercaptohexyl-1-alcohol; the isocyanated montmorillonite loaded titanium dioxide is prepared by reacting montmorillonite loaded titanium dioxide obtained by a sol-gel method with isophorone diisocyanate; the modified starch is prepared by reacting octadecanoyl chloride and acryloyl chloride with starch, then carrying out graft copolymerization with ethyl acrylate and further introducing glycidyl methacrylate, so that the plastic bag is endowed with excellent mechanical properties, biodegradability and antibacterial property.

The invention discloses a method for preparing dimethyl carbonate through reaction of CO and methyl nitrite, belongs to the technical field of preparation of dimethyl carbonate, and aims to solve the problem that in the prior art, in the process of preparing dimethyl carbonate through catalysis of reaction of CO and methyl nitrite, the reaction time is short. The preparation method specifically comprises the following steps: in an inert gas atmosphere, mixing and stirring isocyanatopropyltriethoxysilane and N, N-dimethylformamide, raising the temperature of a reaction system to 50-60 DEG C, carrying out a reaction for 1-2 hours, and carrying out a reaction for 1-2 hours, so as to obtain a reaction solution; and 3-aminopropionic acid is added into the reaction system. According to the method, silicon-aluminum coating, potassium modification and 18-crown-6-ether modification are sequentially performed after a halogen-free palladium-copper catalytic system is prepared, so that the conversion rate of impurities and the chromatic value of a product are reduced, the conversion rate of methyl nitrite is effectively increased, and the service life of the catalyst is effectively prolonged.

The invention relates to the technical field of high polymer materials, and discloses a wear-resistant and anti-slip plastic tray and a manufacturing method thereof. Comprising the following steps: S1, adding polytetrahydrofuran glycol and dihydroxyl-terminated polysiloxane into acetone, uniformly stirring, heating to 65-70 DEG C, adding isophorone diisocyanate and a tin catalyst, and stirring for 2-3 hours to obtain an isocyanato-terminated polyurethane prepolymer; adding a branching agent, reacting for 2-3 hours at the temperature of 60-70 DEG C, adding hydroxyethyl methylacrylate, stirring and reacting until the content of isocyanate groups in the system is not changed any more, and carrying out rotary evaporation to remove the solvent, so as to obtain modified polyurethane acrylate; s2, taking urethane acrylate, a photoinitiator, modified urethane acrylate, modified silicon dioxide and a diluent, and uniformly stirring to obtain a wear-resistant antiskid coating; and S3, the outer surface of the tray base body is coated with the wear-resistant and anti-skid coating, curing is conducted, and the wear-resistant and anti-skid plastic tray is obtained.

The invention discloses a thermoplastic polyurethane color-changing film which comprises a core layer, a first outer layer and a second outer layer, the first outer layer and the second outer layer are arranged on the two sides of the core layer respectively, and the core layer is a colored layer; the core layer, the first outer layer and the second outer layer all comprise TPU particles and functional master batches, raw materials of the functional master batches comprise a first TPU carrier and anti-ultraviolet particles, the anti-ultraviolet particles sequentially comprise inorganic anti-ultraviolet particles, a coating layer, a transition layer and an organic anti-ultraviolet outer layer from inside to outside, the transition layer is isocyanato-terminated polyurethane, and the organic anti-ultraviolet outer layer is an organic anti-ultraviolet outer layer. And the raw materials of the coating layer and the organic anti-ultraviolet outer layer both contain hydroxyl. The inorganic uvioresistant particles, the coating layer, the transition layer and the uvioresistant particles of the organic uvioresistant outer layer are sequentially arranged from inside to outside, and the dispersity of the uvioresistant particles in the film layer is improved through the transition layer made of aliphatic isocyanate; the inorganic uvioresistant particles and the organic uvioresistant outer layer are combined to improve the uvioresistant performance of the color changing film; the stability of the structure and performance of the anti-ultraviolet particles is improved through the transition layer.

The invention relates to the field of adhesives, and discloses an environmentally friendly urea-formaldehyde resin adhesive and a preparation method thereof. The environmentally friendly urea-formaldehyde resin adhesive comprises the following components in parts by weight: 45-60 parts of urea, 50-80 parts of formaldehyde solution, 10-25 parts of a modified additive, and 5-15 parts of modified polyvinyl alcohol; the modified additive is a modified additive prepared by grafting isophorone diisocyanate onto multi-walled carbon nanotubes loaded with nano-titanium dioxide and further sealing isocyanate with sodium bisulfite; the modified polyvinyl alcohol is modified polyvinyl alcohol grafted with sodium methyl silicate. The invention reduces the free formaldehyde content in the prepared urea-formaldehyde resin adhesive by adding the modified additive and the modified polyvinyl alcohol, and the prepared plywood has low formaldehyde release, is safe and environmentally friendly, and has excellent bonding strength and water resistance.

The invention discloses a single-component polyurethane liquid glue which comprises a hydroxyl-terminated polyurethane prepolymer, polyol and isocyanate, and the molar ratio of an isocyanate group to a hydroxyl group is (1.01-5): 1; the hydroxyl-terminated polyurethane prepolymer comprises aliphatic or / and alicyclic isocyanate and polyol, and the molar ratio of an isocyanate group to a hydroxyl group is (0.5-0.99): 1. The preparation method comprises the following steps: firstly, synthesizing a hydroxyl-terminated polyurethane prepolymer, and then taking the hydroxyl-terminated polyurethane prepolymer as a main material to react with a small part of polyhydric alcohols and isocyanate. The polyurethane liquid adhesive synthesized by the two-step method has the performance advantages of high initial adhesion and low hardness, meets the process requirement of normal-temperature coating, can replace an adhesive film product and a hot melt adhesive product, and is applied to composite bonding of fabrics in the textile industry.

The present disclosure provides a polymetallic-ore beneficiation and separation reagent, a preparation method therefor and use thereof. The preparation method for a polymetallic-ore beneficiation and separation reagent, includes following steps: (1) mixing a substance A, caustic soda, soda ash and sodium polysulfide, and then heating the same and performing a catalytic reaction, to render an intermediate product B, wherein the substance A includes one or more of urea, glycine, urea peroxide, ammonium cyanate and isocyanic acid; and (2) mixing the intermediate product B with trichloroisocyanuric acid, dichloroisocyanuric acid and 2-amino-3-(4-imidazolyl)propanoic acid, to render the polymetallic-ore beneficiation and separation reagent.

The invention discloses a phenolic resin material as well as a preparation method and application thereof in 3D printing, and relates to the technical field of high polymer materials. When the phenolic resin material is prepared, hydroxylated carbon nanotubes react with isocyanate propyl triethoxy silane to prepare pre-modified carbon nanotubes, and then the pre-modified carbon nanotubes react with 2-chloroethyl triethoxy silane to prepare modified carbon nanotubes; the preparation method comprises the following steps: reacting vanillin with 5-amino-1, 2-dihydro-2-methyl-3H-1, 2, 4-triazole-3-thioketone and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide in sequence, so as to obtain pre-modified vanillin; reacting the pre-modified vanillin with divinyl disulfide to obtain modified vanillin; the modified vanillin, phenol and formaldehyde react to prepare modified phenolic resin, and then the modified phenolic resin reacts with the modified carbon nanotubes to prepare the phenolic resin material. The phenolic resin material prepared by the invention has good flame retardance, heat resistance, aging resistance, self-repairing property and mechanical property.

The invention belongs to the technical field of coatings, and particularly relates to a two-component flexible road marking coating and a preparation method thereof. The two-component flexible road marking coating comprises a component A and a component B in a mass ratio of (2.5-3): 1, wherein the component A comprises 5-10 parts of bisphenol epoxy resin with the epoxy value of 0.4-0.55, 40-50 parts of polymer dihydric alcohol, 0.1-0.3 part of a catalyst, 10-15 parts of pigment, 15-20 parts of filler, 5-10 parts of an anti-skid material, 25-35 parts of internally mixed glass beads, 0.5-1 part of a dispersing agent, 0.5-1 part of a defoaming agent, 3-5 parts of a plasticizer and 30-60 parts of a solvent; the component B is a curing agent composed of modified isocyanate and an isocyanate tripolymer according to the mass ratio of (5-8): 1; the modified isocyanate is a compound which is prepared by carrying out hydrosilylation reaction on unsaturated isocyanate and siloxane with a silicon atom number of 2-4 and a hydrogen-containing terminal, and two ends of the modified isocyanate are isocyanato; the coating has excellent brittle fracture resistance, water resistance and wear resistance at low temperature.

The invention belongs to the technical field of polyurethane adhesives, and particularly relates to a two-component polyurethane structural adhesive as well as a preparation method and application thereof. The bi-component polyurethane structural adhesive comprises a component A and a component B which are independently stored, the component A comprises polyester polyol, polyether polyol, castor oil polyol and optional first filler, first molecular sieve, first plasticizer and first aid; the component B comprises an isocyanate compound, an isocyanate double-terminated polyurethane prepolymer and optional second filler, a second molecular sieve, a second plasticizer and a second aid; the first filler and the second filler are independently selected from filler modified by a silane coupling agent. The key of the invention lies in that polyester polyol, polyether polyol and castor oil polyol with long carbon chain structures are introduced as polyol raw materials, and a specific filler modified by a silane coupling agent is introduced, so that the obtained bi-component polyurethane structural adhesive has excellent interfacial shear strength and T peel strength at the same time.

The invention relates to a preparation method of a PET composite film, and belongs to the technical field of photovoltaic packaging assemblies. The preparation method of the PET composite film comprises the following steps: carrying out corona on the surface of the PET film; roller-coating a PVB (Polyvinyl Butyral) adhesive and drying; and hot-pressing and compounding with a flexible packaging adhesive film. The PVB adhesive contains a silane coupling agent of which the content is less than 10wt%. Particularly, when the silane coupling agent contains an amino group or an isocyanate group and the dosage of the silane coupling agent is 0.09-1.5 wt%, the bonding strength between the PET film and the flexible packaging adhesive film can be remarkably improved.

The invention relates to the field of protective films, and discloses a liquid crystal light guide plate high-transmittance tpe protective film and a preparation method thereof.The protective film comprises SEBS, polypropylene, modified halloysite nanotubes, modified silicon dioxide and auxiliaries; the modified halloysite nanotube is prepared by reacting a functional additive prepared by grafting an isocyanato antioxidant component and a modified benzothiazole-containing monomer with 3-chloropropyltrimethoxysilane, and then grafting on the surface of the halloysite nanotube; the isocyanated antioxidant component is prepared by reacting 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid with N-hydroxymethyl acrylamide, then reacting the product with 2-mercaptoethanol to obtain a hydroxylated antioxidant component, and then reacting the hydroxylated antioxidant component with isophorone diisocyanate; the modified benzothiazole-containing monomer is prepared by reacting 2-aminobenzothiazole with bromoacetyl bromide and then reacting with 3, 5-dihydroxybenzylamine, and the protective film prepared by the invention has good thermo-oxidative aging resistance, antibacterial property, heat resistance and tensile property.

The present invention belongs to the technical field of artificial boards, and relates to a curing agent for a formaldehyde-free substrate, which is composed of 5-10wt% of methyl ethyl ketone oxime, 20-30wt% of polyacrylamide, and the balance of water by weight percentage. A preparation method and application of the curing agent for the formaldehyde-free substrate are also disclosed. The curing agent for the formaldehyde-free substrate disclosed by the present invention has good sealing property, can reduce the viscosity of isocyanate, extend the application period, and improve the fluidity and dispersibility of spray glue. By sealing the free isocyanate group, the pre-curing during drying is reduced, and the isocyanate is unsealed during high-temperature hot pressing, and the isocyanate is cured quickly, the hot pressing efficiency is improved, the hot pressing time is shortened, and the water loss is reduced; more active isocyanate groups are retained in the adhesive, the bonding performance and water resistance are improved, the amount of isocyanate glue applied is reduced, and the reaction with water is reduced. The present invention can also effectively improve the production capacity of the formaldehyde-free floor substrate and reduce the cost; by increasing the moisture content, the expansion or contraction degree caused by the change of humidity in the external environment is reduced, and the dimensional stability is improved.

The invention discloses a low-free-monomer solvent-free polyurethane adhesive for aluminum-plastic compounding, which belongs to the technical field of chemical building materials, and is characterized in that the number of isocyanate groups contained in a prepolymer is reduced by improving a formula, so that the viscosity of the prepolymer is reduced, the adhesive is easier to spread and level on the aspect of a base material, and the service life of the adhesive is prolonged. Aromatic polyester polyol and modified polyether polyol with a core-shell structure are introduced, so that the high temperature resistance of the adhesive can be effectively improved, the adhesive is suitable for compounding of various plastic films and aluminum foils, the core-shell structure can increase the strength of the polyurethane adhesive, slippage is generated through the core-shell structure, stress is dispersed, and the adhesive has good adhesion. The adhesive is prevented from losing efficacy under pressure, so that the adhesive is suitable for compounding various plastic films and aluminum foils, and the bonding strength of the adhesive is improved.

The invention relates to the technical field of high-conductivity silver paste, in particular to low-solid-content high-conductivity silver paste for wind power generation and a preparation method of the low-solid-content high-conductivity silver paste. The invention discloses low-solid-content high-conductivity silver paste for wind power generation. The low-solid-content high-conductivity silver paste comprises the following substances in parts by weight: 20-50 parts of a conductive material; 3-5 parts of a blocked isocyanate curing agent; 3 to 10 parts of polyurethane; 58-70 parts of a solvent; 1-5 parts of a functional additive; the conductive material comprises silver coated copper powder and flake silver powder. The low-solid-content design is adopted, the cost is remarkably reduced, meanwhile, a composite conductive system of the silver-coated copper powder and the flaky silver powder is introduced, the low cost of the silver-coated copper powder and the high conductivity of the flaky silver powder are utilized, and the conductive performance is maintained while the silver consumption is reduced. Meanwhile, a low-temperature curing system is formed by combining polyurethane resin and a blocked isocyanate curing agent, the problem that an epoxy base material is damaged by high-temperature sintering of traditional silver paste is solved through the flexibility of polyurethane and the low-temperature reaction activity of the curing agent, and the vibration fatigue resistance of the coating is improved.

The invention belongs to the technical field of marine antifouling materials, and particularly relates to a marine antifouling polyurethane coating material based on zwitterionic resin and a synthesis method thereof.The synthesis method comprises the steps that the molar ratio R1 of isocyanato to hydroxyl is controlled to be 1.6-2.0, and a polyurethane prepolymer is synthesized through macromolecular polyol and aliphatic or alicyclic diisocyanate; the preparation method comprises the following steps: synthesizing zwitterionic polyol from N-methyldiethanolamine, triethanolamine, acid anhydride, sultone, a bisphenol compound and a polar solvent, then adding a prepolymer diluted by the polar solvent, and controlling the molar ratio of isocyanato hydroxyl to 1.6-2.0 to carry out chain extension so as to introduce a large amount of zwitterionic ions, thereby obtaining the product. The tensile shear strength of the coating is larger than 3.0 MPa, the 180-degree peel strength is larger than 10 N / cm, and the marine coupon antifouling performance score within 24 months is larger than 95. The zwitterionic polyol synthesis route raw materials are low in price and easy to obtain, the zwitterionic polyol is introduced into a polyurethane main chain, no organic or heavy metal ion antifouling agent needs to be added, the main chain contains hydrophilic and hydrophobic soft segment chains, the adhesion of an antifouling coating can be kept in dry and wet environments, and the anti-microbial effect of zwitterionic can be exerted; the marine antifouling paint has remarkable environmental protection and intrinsic long-acting marine antifouling characteristics.

The invention relates to the technical field of sponge production, in particular to a formula of a slow-rebound sponge material and a manufacturing process of the slow-rebound sponge material. 30 to 50 parts of hyperbranched polyether polyol; 3-8 parts of nano cellulose crystal; 2 to 5 parts of a Diels-Alder polysiloxane microsphere; 0.8 to 1.4 parts of a zinc-imidazole composite catalyst; 0.4 to 0.6 part of a delayed amine catalyst; 5-15 parts of a supercritical CO2 foaming agent; and 1-3 parts of a chain extender. According to the slow-rebound sponge material formula and the manufacturing process thereof, the performance of the sponge is remarkably improved through optimization of the raw material ratio and modification treatment.

The invention relates to the field of pipes, and discloses a high-strength CPVC pipe and a preparation method thereof.The pipe comprises CPVC resin, modified multi-walled carbon nanotubes, modified nano silicon dioxide and auxiliaries; the modified multi-walled carbon nanotubes are prepared by grafting phosphorus-containing cardanol derivative based benzoxazine and oxidized multi-walled carbon nanotubes; phosphorus-containing cardanol derivative benzoxazine reacts with 1, 5-naphthylenediamine to prepare an aldehyde cardanol intermediate, the aldehyde cardanol intermediate is prepared by reacting paraformaldehyde with hydrogenated cardanol, the obtained cardanol derivative and DOPO are subjected to addition, and then the obtained phosphorus-containing cardanol derivative reacts with paraformaldehyde and 3-aminopropyltriethoxysilane to prepare the flame retardant. The modified nano silicon dioxide is prepared by introducing polyethylene glycol into the surface of isocyanated nano silicon dioxide and grafting with 3, 5-bis (tert-butyl)-4-hydroxybenzene propionyl chloride, and the pipe prepared by the invention is high in tensile strength and impact strength and has good long-acting oxidation resistance, high temperature resistance and flame retardance.

The invention belongs to the technical field of marine corrosion protection, and particularly relates to a multi-metal flushing corrosion inhibitor and a preparation method thereof, benzotriazole and isocyanate propyl triethoxy silane or isocyanate propyl trimethoxy silane are used as raw materials, and a novel benzotriazole corrosion inhibitor containing a silane structure is synthesized through catalysis. The benzotriazole containing the silane structure is compounded with corrosion inhibitors such as organic acid salt, organic acid polymer and organosilane to form the multi-metal flushing corrosion inhibitor for steel, aluminum alloy and copper, which does not contain nitrite, phosphate and heavy metals (lead, cadmium and mercury). When in use, the corrosion inhibitor is diluted to 0.2-0.5%, the corrosion inhibitor is applied to flushing protection of offshore drilling platforms, marine investigation equipment and coastal facilities through flushing and spraying processes, a corrosion inhibitor protective film is formed on the basis of removing a surface salt film, corrosion of multiple metals such as steel, aluminum alloy and copper alloy in a marine atmospheric environment is effectively inhibited, and the corrosion inhibitor has good environmental friendliness.

The invention discloses a reaction kettle flow control device for methyl isocyanate production, and relates to the field of reaction containers, the reaction kettle flow control device comprises a reaction kettle, a stirrer, a guide cylinder, an atomizer and a flow control disc are arranged in the reaction kettle, the flow control disc is arranged above the guide cylinder, and the flow control disc can move in the axial direction of the reaction kettle to get close to or away from the guide cylinder; a plurality of conical holes with large upper parts and small lower parts are formed in the flow control disc in a penetrating manner, when liquid in the reaction kettle circularly flows, the liquid in the guide cylinder flows upwards and rushes out from the conical holes of the flow control disc, and the rushed liquid is in contact and mixed with atomized liquid drops sprayed by the atomizer; by arranging the flow control disc and the conical holes formed in the flow control disc, liquid in the flow guide cylinder flows upwards and rushes out of the conical holes of the flow control disc, so that the liquid level is reconstructed into a thick umbrella-shaped liquid film which is uniformly distributed on the premise of not influencing the stirring effect, the liquid level is effectively expanded, and the stirring effect is improved. The adding speed and the stirring speed of the atomizer are adjusted in real time according to the mixing process, and the absorption efficiency is improved.

The invention relates to the field of road asphalt, and discloses high-modulus modified asphalt for improving road performance and a preparation method thereof, the modified asphalt comprises matrix asphalt, coal liquefied asphalt, modified rubber seed oil, ethylene-vinyl acetate copolymer and modified carbon nanotubes; the modified rubber seed oil is prepared from epoxy rubber seed oil and a carboxylated flame-retardant component prepared by reaction of amino trimethylphosphonic acid, trimethylolpropane and malonic acid; the modified carbon nano tube is prepared from a toluene-2, 4-diisocyanate isocyanated carbon nano tube and an aminated modifier through a reaction; the amination modifier is prepared by performing acylating chlorination grafting on 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid by using thionyl chloride and then grafting with p-phenylenediamine. According to the invention, the coal liquefaction asphalt, the modified rubber seed oil, the ethylene-vinyl acetate copolymer and the modified carbon nanotube are added into the matrix asphalt; the high and low temperature performance, the flame retardant performance and the anti-aging performance of the asphalt material can be improved.

The present invention relates to a method for preparing a polyisocyanate based on 1,5-pentamethylene diisocyanate, comprising reacting an isocyanate component, containing at least 1,5-pentamethylene diisocyanate, in the presence of at least one catalyst and optionally in the presence of one or more co-reagents, comprising alcohols, amines, water and carbon dioxide, to obtain a raw polyisocyanate, characterised in that, in a further step, the raw polyisocyanate is distilled at a temperature range of 155 °C to 175 °C and, in a further step, the polyisocyanate based on pentamethylene diisocyanate is obtained. The invention also relates to a polyisocyanate based on 1,5-pentamethylene diisocyanate, a two-component system, the use thereof for the production of a coating on a substrate, the coating and the composite formed of the coating and the substrate.

The application provides a two-component polyurethane sealant suitable for automobile headlight structure bonding and a preparation method thereof, and relates to the technical field of polyurethane sealants. The two-component polyurethane sealant comprises component A and component B, and the mixing mass ratio of the component A and the component B is 1:1 to 1:5. The component A comprises the following raw materials: isocyanate group terminated organic silicon modified polyurethane prepolymer 80-120 parts, powder filler 15-40 parts, and auxiliary agent 0.5-2 parts. The component B comprises the following raw materials: polyol 100-160 parts, powder filler 50-200 parts, catalyst 0.01-0.1 parts, and auxiliary agent 0.1-20 parts. The polyurethane sealant prepared by using single-end double-hydroxyl alkyl polydimethylsiloxane composite polyol for the first time has better water resistance, better bonding force on low surface energy material (PP), better cold and hot impact resistance, better ultraviolet aging resistance, better elongation at break, and better shock resistance.

The invention discloses a high-solid-content fluorocarbon finish paint composition and a preparation method thereof. The high-solid-content fluorocarbon finish paint composition comprises a main agent and a curing agent, the main agent is prepared from the following components in percentage by mass: 30 to 60 percent of fluorocarbon resin, 1 to 15 percent of auxiliary resin, 10 to 25 percent of pigment, 0 to 20 percent of filler, 0.1 to 2.0 percent of wetting dispersant, 0.1 to 2 percent of thixotropic agent, 0 to 2 percent of UV-resistant aid and 0 to 20 percent of solvent; the curing agent is aliphatic isocyanate which comprises one of a tripolymer of hexamethylene diisocyanate, biuret or an addition product or a mixture of the tripolymer, the biuret and the addition product; the mass ratio of the main agent to the curing agent is (5: 1)-(10: 1). The fluorocarbon finish paint has the characteristics of high solid content, low VOC (volatile organic compound), low construction viscosity, easiness in spraying and the like, has excellent mechanical properties, water resistance, acid and alkali resistance, weather resistance and the like, and can be applied to various industrial environments such as bridge infrastructure petrochemical engineering and the like.

The present invention relates to the field of polyurethane technology, and discloses a carbon nanotube synergistic flame-retardant modified waterborne polyurethane coating and a preparation method thereof. The hydroxyl groups of the acidified carbon nanotubes serve as polymerization reaction sites, and 4,4'-methylenebis(phenyl isocyanate) and triphenylenediamine-based PEPA are subjected to an in-situ graft polymerization reaction to obtain PEPA-based polymer-grafted carbon nanotubes through covalent bonding. After polymer grafting modification, the carbon nanotubes have better compatibility with the waterborne polyurethane matrix and excellent dispersibility, thus playing a better reinforcing role and significantly improving the tensile strength, elongation at break, and tensile modulus of the polyurethane film. The grafted polymer molecular chain contains a PEPA phosphate flame-retardant structure and a urea-based nitrogen-containing structure, as well as a high-carbon triphenyl aromatic ring structure, forming a nitrogen-phosphorus-carbon expansion flame-retardant system, which enables the polyurethane to exhibit excellent flame retardant properties.

The application discloses a catalyst for isocyanate borohydration reaction and a preparation and application method thereof. When the catalyst is used for catalyzing the borohydration reaction of isocyanate and borane to synthesize borate, the catalyst has high catalytic activity, mild reaction conditions (the reaction can be carried out at room temperature), short reaction time, high product yield (≥99%), and the reaction is simple, controllable, and simple in post-treatment.

This invention belongs to the field of pharmaceutical chemical synthesis technology, specifically relating to a method for preparing dicyandiamide by urea pyrolysis with anti-scaling properties. The method includes a reaction process using urea, alkaline earth metal oxides, and a scale inhibitor dopant as raw materials. The scale inhibitor dopant includes at least one of silicon dioxide and titanium dioxide, and its weight accounts for 0.1% to 5% of the weight of the alkaline earth metal oxides. Experiments show that introducing a scale inhibitor dopant into the reaction system can alter the surface tension of the isocyanate melt, helping to improve the surface properties and rheological state of the intermediate melt. This reduces material adhesion and aggregation on the reactor wall, lowers the risk of scaling and clogging, and may even eliminate scale buildup on the reactor wall, thereby improving the stability of continuous production.