339 results about "Polyoxymethylene" patented technology

The invention discloses an injection molding high-density alloy steel sintering integrated preparation process, which comprises the steps of alloy raw material proportioning, feed preparation, injection molding, continuous thermal desorption sintering treatment and enhanced heat treatment, and comprises the following steps: selecting gas atomization pure iron powder subjected to vacuum reduction treatment, and matching with chromium, nickel, molybdenum, vanadium, carbon, silicon, manganese and iron powder multi-component alloy proportioning; a phenolic resin-polyformaldehyde composite binder is adopted, 0.5-1.5% of a lubricating additive is added, internal mixing parameters are controlled under the protection of inert gas according to the powder-to-rubber ratio of 72-77%: 23-28%, and the problem that the compatibility of a single binder and alloy powder is poor is solved; three-section gradient temperature control injection molding and a continuous atmosphere furnace sectional degreasing-sintering integrated process are combined, and strengthening heat treatment is matched, so that sufficient diffusion of elements and densification of a green body are realized, and defects are avoided. The technology effectively solves the technical problems that traditional raw materials are high in impurity content and insufficient in element diffusion, and therefore the alloy steel sintering preparation efficiency can be improved.

The invention discloses an application of an ionic liquid in extraction of trioxymethylene, in the process of generating trioxymethylene by acid-catalyzed condensation of a formaldehyde aqueous solution, the ionic liquid is added as an extraction agent to extract and separate the trioxymethylene generated by reaction, and the ionic liquid is methyl tributyl phosphonium bis (trifluoromethanesulfonyl) imide salt; when the ionic liquid is used for extracting trioxymethylene, a ternary azeotropic system of trioxymethylene, water and methylene glycol can be broken, the ionic liquid and trioxymethylene are subjected to nonpolar Van der Waals' force interaction so as to realize extraction, and methylene glycol and water are left in a water phase through hydrogen-bond interaction, so that high-purity trioxymethylene with the purity of more than or equal to 99.5 wt.% is obtained.

The invention discloses piperonyl butoxide and a preparation method thereof. The preparation method comprises the following steps: carrying out mixing reaction on dihydrosassafras oil, acetyl chloride and trioxymethylene in the presence of concentrated hydrochloric acid; after the reaction is finished, chloromethyl material reaction liquid is obtained; mixing and reacting the chloromethyl material reaction liquid with sodium hydroxide and diethylene glycol monobutyl ether to obtain a product containing piperonyl butoxide. According to the preparation method of piperonyl butoxide, the dihydrosassafras oil, acetyl chloride and trioxymethylene are subjected to chloromethylation reaction in the presence of a small amount of concentrated hydrochloric acid, so that the use of a large amount of concentrated hydrochloric acid in the traditional process is avoided, and the problem of waste acid generated in the chloromethylation reaction process is solved; and meanwhile, the content of piperonyl butoxide in the product can be increased, and the content of piperonyl butoxide is ensured to be greater than 98%.

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 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 provides a binder system for beryllium-titanium alloy powder injection molding and application, and relates to the technical field of metal powder injection molding. The adhesive system consists of the following components in percentage by weight: 76 to 84 percent of polyformaldehyde, 7 to 9 percent of high-density polyethylene, 5 to 7 percent of ethylene-vinyl acetate copolymer, 3 to 5 percent of paraffin, 0.1 to 0.5 percent of stearic acid, 0.1 to 1.5 percent of polyethylene glycol and 0.1 to 1 percent of BASF antioxidant. The feed preparation method based on the system comprises the steps of powder pretreatment, binder preparation, banburying mixing and cooling granulation, and uniform coating and dispersion of beryllium-titanium powder can be achieved. According to the system, the problems that in beryllium-titanium alloy injection molding, powder is prone to oxidation, poor in fluidity and low in size precision are solved, the viscosity of the prepared feed at 180 DEG C is 88-101 Pa.S, and the oxygen content is smaller than or equal to 0.24 wt%; the relative density of a finished product is larger than or equal to 96.5%, the size precision is + / -1% / in-+ / -2% / in, and the method is suitable for industrial production of beryllium-titanium alloy complex parts in the fields of spaceflight and nuclear energy.

The invention provides a composite solid electrolyte, a preparation method thereof and a battery, the composite solid electrolyte comprises a lithium salt, polyformaldehyde, a plasticizer and an inorganic filler, and the mass ratio of the plasticizer to the polyformaldehyde is 1: 50-1: 4. When the plasticizer accounts for a relatively small amount, crystallization of polyformaldehyde cannot be effectively inhibited, and the ionic conductivity of the composite solid electrolyte is relatively low; and when the plasticizer accounts for a large amount, the mechanical property of the electrolyte is poor. Therefore, the ionic conductivity of the polyformaldehyde-based electrolyte can be improved by a proper amount of plasticizer, and meanwhile, the electrolyte keeps good mechanical properties. The room-temperature ionic conductivity of the polyformaldehyde-based composite solid electrolyte provided by the invention can reach 1.43 mS / cm.

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.

A dematerialized information handling system display stand supports a display assembly with vertical adjustments using a single injection molded polyoxymethylene (POM) sliding member inserted in an extruded aluminum riser. A compression spring locks the sliding member in place with torsional force that releases to enable vertical movement. A hinge member couples to the sliding member to accept a display support that extends out of the riser and couples to the display assembly. Vertical sliding movement is provided with an assembly that uses only one screw for ease of assembly and disassembly.

The invention discloses a polyphenyl ether modified epoxy resin-based copper-clad plate, and particularly relates to the technical field of copper-clad plates, the polyphenyl ether modified epoxy resin-based copper-clad plate comprises a glue solution, an electronic glass fabric and a copper foil, and the glue solution comprises the following raw materials: modified polyphenyl ether, an inorganic filler, a curing agent, a flame retardant and the balance of epoxy resin. The bisphenol A epoxy resin, toluene and benzoyl peroxide are utilized to treat polyphenyl ether, the molecular weight of the polyphenyl ether can be reduced, the crosslinking property of the polyphenyl ether and the epoxy resin is better, then paraformaldehyde is utilized to catalyze and modify the polyphenyl ether, the terminal of the polyphenyl ether is grafted with hydroxymethyl, and the polyphenyl ether is grafted with polyphenyl ether. The compatibility and interface bonding force of the obtained hydroxymethylated polyphenyl ether and epoxy resin are good, the dielectric loss performance and toughness of the copper-clad plate can be effectively improved, and anhydrous aluminum silicate of an amorphous layered gap structure formed through specific activation treatment can be formed during temperature-controlled calcination of kaolin. The dielectric constant and the dielectric loss of the copper-clad plate can be obviously reduced.

The invention discloses quick heat-conducting precoated sand and a preparation process thereof, and relates to the technical field of precoated sand, the quick heat-conducting precoated sand comprises the following raw materials by weight: 100-105 parts of crude sand, 6-8 parts of a modified resin prepolymer, 2-4 parts of modified POE, 3.5-4.5 parts of a lubricant, and 3-5 parts of nano silicon nitride. The modified POE has a relatively strong high-temperature toughening effect on the modified resin prepolymer, can also form chemical crosslinking with the modified resin prepolymer, and has relatively strong compatibility with other raw materials in the precoated sand. The modified resin prepolymer is obtained by heating and ring-opening polymerization of a benzoxazine monomer obtained by reaction of 5-nitrosalicylaldehyde, 2, 4-bis (trifluoromethyl)-5-pyrimidinyl ethyl formate, paraformaldehyde, furfuryl amine and the like, the curing temperature of the modified resin prepolymer is reduced, the thermal stability is improved, and improvement of the high temperature resistance of the precoated sand is facilitated.

The invention relates to anti-corrosion micro-expansion self-compacting concrete for a steel pipe pile. Each cubic meter of the concrete is prepared from the following components in parts by mass: 250 to 300 parts of cement, 100 to 120 parts of recycled micro powder, 800 to 830 parts of recycled fine aggregate, 940 to 980 parts of recycled coarse aggregate, 20 to 32 parts of expanding agent, 0.15 to 0.25 part of graphene oxide, 4 to 6 parts of glass fiber, 1.5 to 4 parts of polyformaldehyde fiber, 10 to 13 parts of water reducing agent and 150 to 170 parts of water. The anti-corrosion micro-expansion self-compacting concrete has anti-corrosion, micro-expansion and self-compacting properties, can be suitable for underwater steel pipe pile construction, and remarkably improves the service life and reliability of the steel pipe pile in ocean and water-rich environments.

The invention relates to polyformaldehyde fiber concrete based on a stud area of a steel box girder, and belongs to the technical field of building materials. The polyformaldehyde fiber concrete comprises the following components in parts by weight: 400-550 parts of cement; 80 to 180 parts of water; 1000 to 1100 parts of coarse aggregate; 700 to 780 parts of fine aggregate; the surface of the calcium sulfate whisker is coated with a silane coupling agent. The polyformaldehyde fibers and the calcium sulfate whiskers are added into the concrete at the same time, the calcium sulfate whiskers are doped to provide a framework support for the concrete, after the calcium sulfate whiskers are wrapped by the cement paste, the calcium sulfate whiskers and other materials jointly form a three-dimensional supporting structure, and concrete pores can be filled with part of the whiskers, so that the compactness and compressive strength of the concrete are enhanced. The polyformaldehyde fibers are added, so that stress can be effectively dispersed, when the concrete is pressed, the polyformaldehyde fibers and a cement matrix bear loads together, the stress concentration phenomenon is reduced, and the compressive strength of the concrete is further improved.

The invention provides a treatment device and a treatment method for formaldehyde-containing wastewater. The treatment device comprises an adjusting unit, a degradation pretreatment unit and an anaerobic membrane biological reaction unit, the anaerobic membrane biological reaction unit comprises an anaerobic digestion sludge reaction zone, a membrane separation zone and a reconnection piece, the anaerobic digestion sludge reaction zone is communicated with the membrane separation zone, one end of the reconnection piece is communicated with the membrane separation zone, and the other end of the reconnection piece is communicated with the anaerobic digestion sludge reaction zone. The method can effectively remove formaldehyde, COD and other pollutants in the polyformaldehyde wastewater, effectively resists to-be-treated wastewater pollutant concentration fluctuation and violent water quantity and water quality impact, and has the advantages of low sludge yield, stable treatment and up-to-standard effluent quality.

The invention provides a beryllium-titanium alloy injection molding feed and a preparation method thereof, and relates to the technical field of metal injection molding. The beryllium-titanium alloy injection molding feed is prepared by mixing composite beryllium-titanium alloy powder and a catalytic degreasing binder according to the mass ratio of (70-80): (20-30), the composite beryllium-titanium alloy powder is composed of, by mass, 40% of spherical beryllium powder, 30% of spherical titanium powder and 30% of irregular beryllium powder. The D90 of the spherical beryllium powder and the spherical titanium powder is 60-80 [mu] m, and the D90 of the irregular beryllium powder is 6-10 [mu] m; the catalytic degreasing binder is prepared from the following components in parts by mass: 76 to 84 parts of polyformaldehyde, 7 to 9 parts of high-density polyethylene, 5 to 7 parts of ethylene-vinyl acetate copolymer, 3 to 5 parts of paraffin, 0.1 to 1.5 parts of stearic acid, 0.1 to 1.5 parts of polyethylene glycol and 0.1 to 1 part of BASF antioxidant. The spherical powder and the irregular powder are reasonably proportioned, so that the powder stacking density and sintering compactness are improved, and meanwhile, the flowability is considered.

This invention discloses a method for synergistic surface modification of tungsten-copper powder to inhibit the decomposition of polyoxymethylene (POM), belonging to the field of polymer material anti-degradation modification technology. This invention addresses the problem that tungsten-copper powder easily catalyzes the severe degradation of POM during PIM tungsten-copper feedstock mixing and injection molding, leading to poor feedstock flowability, injection instability, large fluctuations in product size and weight, and low yield. First, the tungsten-copper powder is activated by low-temperature plasma etching to construct a reaction interface. Then, a silica barrier film is prepared using tetraethyl orthosilicate as the silicon source and modified with fluorosilicone, loaded with a metal soap neutralizer, grafted with a hindered phenolic antioxidant, and simultaneously introduced with epoxy active groups to construct a multi-component synergistic degradation inhibition system. This invention, through multi-step synergistic modification, precisely controls the modification process, comprehensively inhibiting POM decomposition. When the modified powder is blended with POM, a capping reaction occurs, blocking the unzipping degradation pathway of POM, improving the compatibility of the filler and the matrix, and ensuring the continuous and stable preparation and injection molding of PIM tungsten-copper feedstock.

The invention relates to the technical field of formaldehyde copolymer production, and discloses a trioxymethylene static crystallization separation method which comprises the following steps: S1, cooling crystallization: the crystallization temperature is 25-30 DEG C, and the crystallization time is 3-4 hours; s2, discharging mother liquor; s3, sweating, wherein the sweating temperature is 50-55 DEG C, and the sweating time is 2-2.5 h; and S4, melting to obtain a high-purity product. According to the invention, the characteristic that the solubility of trioxymethylene is reduced along with temperature reduction is utilized, and separation and purification are realized through temperature gradient regulation and control. The content of trioxymethylene in the prepared finished product reaches 94-96% and is higher than that in the prior art by 90-92%, the formaldehyde content is only 0.1-0.2%, and the impurity content is lower.

To provide a polyacetal resin composition which can further improve physical properties such as mechanical strength and hot water resistance, while using a modified cross-section glass fiber, when being colored by black, particularly, carbon black.SOLUTION: A polyacetal resin composition contains, with respect to 100 pts.mass of (A) a polyacetal resin, 1 to 100 pts.mass of (B) a modified cross-section glass fiber which is surface-treated with (B1) at least one selected from at least one isocyanate compound selected from the group consisting of a blocked isocyanate compound and a polyurethane resin, an amino silane coupling agent, an epoxy resin, and an acid copolymer, and (B2) a boric acid compound, and 0.001 to 3 pts.mass of (C) at least one binder selected from the group consisting of an organometallic compound containing a metal selected from Sn, Zn and PB, a boric acid compound and a quaternary onium salt compound.SELECTED DRAWING: None

The object of the present invention is to provide a polyacetal resin composition that can suppress the amount of formaldehyde released from a molded part and exhibits excellent impact strength and excellent tensile creep properties under high temperatures and high stresses. The polyacetal resin composition comprises, based on 100 parts by mass (A) polyacetal resin, 0.05 to 0.25 parts by mass (B) ethylene urea, and 0.0005 to 0.2 parts by mass (C) boron nitride.

The present application relates to the technical field of chemical process equipment control, and particularly relates to a polyformaldehyde polymerization auxiliary agent feeding system, which comprises a collection module, a buffer module, a metering module, a control module, a conveying module, a blocking module and a connecting module. The collection module acquires auxiliary agent attribute parameters and environmental data in real time; the buffer module maintains a micro-positive-pressure inert environment through a nitrogen sealing unit to prevent material oxidation; the metering module generates high-precision data by monitoring quality changes using a liquid loss balance; the control module dynamically adjusts the conveying rate based on a fuzzy PID algorithm; the conveying module uses a micro gear pump to reduce internal leakage; the blocking module absorbs fluid pulsation through a pulse damping unit; and the connecting module has a flexible pipeline structure to block mechanical vibration transmission. The modules cooperate to realize the precise conveying of several milliliters to tens of milliliters of auxiliary agent per hour, improve the feeding stability and precision, and ensure the polyformaldehyde polymerization reaction effect.

The invention discloses high-strength and high-ductility concrete and a preparation method thereof. The high-strength and high-ductility concrete is prepared from the following raw materials in parts by weight: 950-1300 parts of a cementing material, 350-550 parts of aggregate, 30-120 parts of steel fibers, 3-15 parts of high-modulus organic fibers, 8-16 parts of an additive, 10-20 parts of a viscosity-adjusting reinforcing agent and 200-260 parts of water, the cementing material comprises the following components in percentage by mass: 40-50% of cement, 35-45% of fly ash microspheres, 6-10% of silica fume and 6-8% of an expanding agent; the expanding agent is a calcium-magnesium composite II-type expanding agent; the admixture adopts a polycarboxylate superplasticizer; the high-modulus organic fiber is one or more of polypropylene fiber, polyvinyl alcohol fiber, polyolefin fiber and polyformaldehyde fiber; by introducing the fly ash microspheres, the silica fume and the viscosity-adjusting enhancer, the workability of the concrete is effectively improved, and the compressive strength of the concrete is also remarkably improved; and through the synergistic effect of the expanding agent and the multi-scale fibers, the ductility and crack resistance of the concrete are further enhanced.

The application discloses a preparation method of energy storage long-cycle COPNA carbon material, and belongs to the technical field of lithium battery energy storage materials, and is characterized by comprising the following steps: first, composite carbonaceous raw materials are heated to 100 DEG C, and after being uniformly stirred, a compounded crosslinking agent and a compounded catalyst are added, and the stirring is continued for 10-15 min until the mixture is uniformly mixed, and then a crosslinking reaction is carried out at 120 DEG C-160 DEG C, and the reaction time is 4-6 h, so that COPNA resin is obtained; the obtained COPNA resin is carbonized at 460 DEG C-520 DEG C, so that COPNA carbon material is obtained. The application has the beneficial effects that: oil slurry pitch, coking wax oil and ethylene tar are used as the composite carbonaceous raw materials, the proportion of the three is controlled to accurately control the polarizing structure proportion of the COPNA carbon material, the structural stability of the material is improved, and the long-cycle requirement is adapted; the COPNA carbon material can consider the conductivity and the regularity of the layered orientation by using the furfural-polyformaldehyde compounded crosslinking agent and the compounded catalyst, and the structure damage or the conductivity decline in the long-term cycle process is avoided.

This disclosure relates to the field of chemical production technology, and in particular to a production apparatus and method for trioxymethylene. The trioxymethylene production apparatus includes: a reaction unit, a separation unit, a first formic acid absorption unit, and a product distillation unit. The outlet of the reaction unit is connected to the inlet of the separation unit; the gas phase outlet of the separation unit is connected to the inlet of the first formic acid absorption unit; the outlet of the first formic acid absorption unit is connected to the inlet of the product distillation unit; and the liquid phase outlet of the separation unit is connected to the inlet of the reaction unit. The reaction unit is used to convert formaldehyde into trioxymethylene under the action of a catalyst. The separation unit is used to separate the gas phase product from the reaction unit into a liquid stream containing recycled formaldehyde and a gas phase stream containing trioxymethylene. The trioxymethylene production apparatus and method provided by this disclosure are used to remove formic acid, a byproduct in the trioxymethylene production process, and reduce equipment corrosion.

This invention relates to the field of polymer materials technology, specifically disclosing the application of low melt flow index (MFI) polyoxymethylene (POM) in improving the spinning performance of POM. Using heteropolyacids as catalysts, and controlling the polymerization temperature and the amount of heteropolyacid catalyst added, low MFI POM with a melt flow index of 0.1 g / 10 min to 2.5 g / 10 min was prepared. After compounding this low MFI POM with a heat-stabilizing agent in a certain proportion, it was blended with general-purpose POM and extruded into granules. Unexpectedly, the thermal stability of the POM was significantly improved, and it also exhibited moderate rheological properties. When applied to the melt spinning process, the spinnability of the POM was significantly improved. Compared with the POM without the addition of this low MFI, the draw ratio increased by approximately 1.4 times, and the tensile strength of the POM fiber reached 6–8 g / d, a maximum increase of approximately 1.4 times. The yield and strength of the finished fiber product were significantly improved.

The utility model discloses a small plastic aerosol pressure container with high sealing performance, which relates to the technical field of pressure containers, and comprises a bottle body with external threads, a bottle cap component in threaded connection and a three-stage sealing system, the threads are meshed to form first-stage sealing, and an elastic sealing ring at the bottom end of the bottle cap component and the end face of a bottle opening form second-stage end face sealing. And the O-shaped sealing ring in the through hole of the valve rod realizes three-stage radial sealing. The valve mechanism adopts the design that a polyformaldehyde valve rod is linked with a reset spring, and the stroke of the valve rod is controlled through a guide limiting ring and a buffer gasket. A positioning boss on the inner side of the bottle cap assembly is in clearance fit with a bottle body H8 / f7 to ensure the coaxiality. Through multi-stage sealing cooperation, structural mechanics optimization and material-process matching, the problems that a traditional container is poor in sealing performance and prone to deformation are solved, the cost is reduced through the full-plasticization design, and the container is environmentally friendly, recoverable and suitable for safe storage and accurate release of high-pressure aerosol in the fields of medical treatment, fire fighting and the like.

The invention discloses a manufacturing method of a double-spiral-line HDPE pipe, and relates to the technical field of double-spiral-line pipe manufacturing. Comprising the following steps: step 1, preparing raw materials, namely preparing a special material for the outer wall of the pipe, namely preparing a mixture of 60-80 parts of high-density polyethylene, 2-5 parts of a defoaming agent, 5-10 parts of an elastomer material, 2-5 parts of a lubricant, 1-2 parts of a stabilizer, 10-15 parts of carbon fibers, 7-10 parts of asphalt, 8-10 parts of polyformaldehyde plastic and 2-3 parts of color masterbatch, the special material for the inner wall of the pipe comprises the following components in parts by weight: 60-80 parts of high-density polyethylene, 2-5 parts of a defoaming agent and 5-10 parts of an elastomer material. The carbon fiber, the asphalt, the polyformaldehyde plastic, the polyethylene resin and the butadiene rubber in different parts are added and compounded with the high-density polyethylene to obtain the composite pipe, and the performance of the composite pipe is enhanced.

This invention relates to a polyoxymethylene-based halide composite solid electrolyte, comprising polyoxymethylene, lithium / sodium salt, halide, plasticizer, and organic solvent; the mass ratio of polyoxymethylene, lithium / sodium salt, halide, plasticizer, and organic solvent is 1:0.08~2:0.001~0.55:0.01~1:6~120. This invention introduces a suitable formulation ratio to achieve a balance between the mechanical strength and ion conduction of the solid electrolyte. Polyoxymethylene, as the main material, provides mechanical strength, ensuring the self-support of the structure, thermal stability, and inhibiting dendrite growth. Small amounts of halide, plasticizer, and organic solvent do not affect the overall mechanical strength and significantly improve lithium-ion migration efficiency, broaden the electrochemical stability window, and enhance ionic conductivity.

This invention discloses a method for preparing furanyl diisocyanate and its applications, relating to the field of organic polymer compounds. Under nitrogen atmosphere, furoic acid is added to concentrated sulfuric acid and mixed, followed by the addition of paraformaldehyde and a temperature-controlled reaction to obtain bis(5-formic acid-2-furan)methane. An organic base is added to a solvent containing bis(5-formic acid-2-furan)methane, and diphenyl azide phosphate is added dropwise to react and obtain bis(5-acyl azide-2-furan)methane. The bis(5-acyl azide-2-furan)methane is dissolved in an organic solvent and reacted to obtain furanyl diisocyanate. This invention provides a high-yield, high-selectivity one-step method for obtaining the intermediate bis(5-formic acid-2-furan)methane, shortening the synthetic route, improving synthetic efficiency, avoiding the use of sodium azide, increasing safety, and reducing production costs. The production of bio-based polyurethane is environmentally friendly, economical, and industrially applicable, and can be used to develop environmentally friendly coatings, adhesives, and sealants.

The present application relates to the technical field of formaldehyde production, in particular to a polyoxymethylene recovery equipment for formaldehyde production and a use method thereof, which comprises a tank body, an inlet and outlet mechanism is arranged on the tank body, a feeding mechanism is arranged on the tank body, a stirring mechanism is arranged on the feeding mechanism, a transmission mechanism is arranged in the tank body, a temperature rising mechanism is arranged in the tank body, and a support seat is fixedly connected to the bottom of the tank body; through the feeding mechanism and the stirring mechanism, the corresponding lye can be added into the tank body in time, the polyoxymethylene is promoted to react to formaldehyde under the condition of strong alkali, and the reaction is more sufficient; through the transmission mechanism, the desalted water added into the tank body is stirred to accelerate the mixing; through the temperature rising mechanism, the polyoxymethylene particles deposited in the bottom of the tank body are heated, and the raw materials in the bottom of the tank body are further stirred and mixed, so that the deposition of polyoxymethylene is reduced.

A film-forming thermoset coating composition includes: (a) an aqueous medium; and Option 1 and / or Option 2 as follows: Option 1: (b1) polyurethane-acrylate core-shell particles including a polymeric acrylic core at least partially encapsulated by a polymeric shell including urethane linkages, where the polymeric shell includes an acid functional group and two or more hydrazide functional groups, where the polymeric shell is covalently bonded to at least a portion of the polymeric core; and (c1) (i) formaldehyde; (ii) polyformaldehyde; and / or (iii) a compound that generates formaldehyde; Option 2: (b2) polyurethane-acrylate core-shell particles including a polymeric acrylic core at least partially encapsulated by a polymeric shell including urethane linkages, where the polymeric shell includes an acid functional group and two or more N-methylolated hydrazide functional groups, where the polymeric shell is covalently bonded to at least a portion of the polymeric core.