191 results about "Polyoxymethylene" patented technology

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.

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 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.

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.

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 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.

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.

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.

The invention discloses a multi-polymer composite material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The multi-polymer composite material comprises the following components in parts by mass: 30-70 parts of a polymer A, 20-40 parts of a polymer B and 10-30 parts of a polymer C. According to the invention, three different polymers are compounded to prepare the multi-polymer composite material; wherein the polymer A comprises at least one of polyamide, polylactic acid and polyformaldehyde, serves as a structural framework and provides mechanical strength; the polymer A comprises at least one of thermoplastic polyurethane, ethylene-vinyl acetate copolymer and polycaprolactone, the polymer B comprises at least one of thermoplastic polyurethane, ethylene-vinyl acetate copolymer and polycaprolactone, the polymer C comprises at least one of polyether-ether-ketone and polysulfone, and the polymer B, the polymer C and the polymer A are compounded, so that the mechanical property of the multi-polymer composite material can be ensured, and the mechanical property of the multi-polymer composite material can be improved. And the processability of the multi-polymer composite material is improved.

This invention relates to a weather-resistant polyoxymethylene (POM) automotive sun visor material and its preparation method, belonging to the field of polymer materials technology. The weather-resistant POM automotive sun visor material prepared by this invention possesses excellent mechanical properties, UV aging resistance, and color fastness. This invention synthesizes an aging-resistant additive containing phosphate ester groups, triazine rings, morpholine rings, and tert-butyl groups. This additive can simultaneously exert peroxide decomposition, UV absorption, free radical scavenging, and steric stabilization effects, achieving efficient and in-situ synergistic effects at the molecular scale, solving the problems of component separation and asynchronous action in traditional systems. Furthermore, the aging-resistant additive synthesized in this invention, due to its polarity matching, can form uniform and strong intermolecular interactions (such as hydrogen bonds) with the POM matrix, serving as a dynamically reversible physical crosslinking point. This effectively improves the material's rigidity and strength while enhancing impact toughness through an energy dissipation mechanism.

The application provides a preparation method of 3,7-dinitro-1,3,5,7-tetraazabicyclononane, comprising the following steps: 1) feeding a first material comprising urea and concentrated sulfuric acid and a second material comprising fuming nitric acid and concentrated sulfuric acid into a microchannel reactor to perform a first-stage nitration reaction, to obtain a first-stage nitration reaction liquid; 2) feeding the first-stage nitration reaction liquid into a first tubular reactor to perform a second-stage nitration reaction, to obtain a second-stage nitration reaction liquid; 3) feeding the second-stage nitration reaction liquid and water into a second tubular reactor to perform a hydrolysis reaction, to obtain a hydrolysis liquid; 4) feeding the hydrolysis liquid and a third material comprising polyoxymethylene and ammonia water into a third tubular reactor to perform a condensation cyclization reaction, to obtain 3,7-dinitro-1,3,5,7-tetraazabicyclononane. The preparation method has the advantages of high safety, less waste pollution and simple operation.

The present invention relates to isocyanate-terminated prepolymers based on polyoxymethylene-polyoxyalkylene block copolymers, to a process for their preparation, and to the use of these isocyanate-terminated prepolymers as isocyanate components in 1- and 2-component systems for coatings, adhesives and sealants.

The application discloses a kind of nano-modified polyformaldehyde plastic particles, contain 60-80% polyformaldehyde resin, 5-15% by boron nitride nanosheet, metal organic framework, nanocellulose Composition of nano composite filler, and environmental protection auxiliary agent and 0.5-2% MXene two-dimensional nanometer material by weight percentage.The present application is to provide a kind of nano-modified polyformaldehyde plastic particles, by the compounding of nanometer material and special preparation process, solve the single performance of traditional polyformaldehyde material, environmental unfriendliness is poor and the problems such as difficult dispersion of nano filler, realize the improvement of polyformaldehyde material in heat conduction, flame retardant, antistatic, adsorption and so on Many aspects of performance, while meeting environmental regulations requirements.

This invention relates to a process for preparing compounds having formula (I): R 1 ‑C(=O)‑O‑CH2‑O‑C(=O)‑R 2 (I), where R 1 and R 2 Each of the terms represents an alkyl, cycloalkyl, or aryl group independently, wherein the alkyl, cycloalkyl, or aryl group is optionally substituted; the process includes step i) reacting the following substances: compound A selected from: trioxane, polyoxymethylene without a hydroxyl terminal group; compound (II): R 1 -C(=O)-O-C(=O)-R 2 (II); and perfluorosulfonic acid; wherein step i) is carried out at a temperature T1 of at least 50°C, wherein the molar ratio of compound (II) to compound A is 1:1 to 1.2:1.

To provide a passenger conveyor capable of more stable operation. [Solution] The passenger conveyor comprises a handrail 7, a drive roller, and a handrail guide 18. The handrail 7 includes a canvas 14 and a main body 12 that is an extrusion molded body of thermoplastic elastomer and has the canvas 14 as a lining. The drive roller contacts the canvas 14 to move the handrail 7 in a circular motion. The handrail guide 18 contacts the canvas 14 to guide the movement of the handrail 7 in the longitudinal direction. The handrail guide 18 is made of a polymer alloy of polyethylene and polyacetal. The polymer alloy does not contain an adhesion inhibitor as an additive.

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

The title of the invention is' Controllable extension of flexible oligomeric glycols and methods thereof '. Disclosed is an extended diol composition comprising: a first component comprising a diol oligomer; and a second component comprising a bis (dimethylaminosilane) species wherein the first component is in a molar excess relative to the second component, and wherein the diol oligomer has a number average molecular weight Mn of from about 500 g / mol to about 5,000 g / mol. The diol oligomer may be alpha, omega hydroxyl terminated, or further includes an R group that is a polyether, such as a perfluoropolyether, polyoxymethylene, polyethylene glycol, polytetramethylene glycol, or poly (propylene glycol); or a polyester, such as poly (caprolactone), poly (lactic acid), or poly (glycolic acid). The bis (dimethylamino) silane species may include R1 and R2, which may include CH3, a vinyl group, and a phenyl group. A method for preparing the extended diol composition is also disclosed.

The invention relates to the technical field of organic synthesis, and provides a synthesis method of an important organic synthesis intermediate methyl diethyl phosphonate. Comprising the following steps: firstly, adding paraformaldehyde and alkali into a solvent, heating and stirring, and filtering to obtain an intermediate solution; and adding cation exchange resin and the intermediate solution into a reaction flask, dropwise adding diethyl phosphite, carrying out a heat preservation reaction after dropwise adding is completed, filtering to remove the cation exchange resin (which can be recycled for multiple times) after the reaction is completed, and carrying out reduced pressure distillation to remove the solvent and a trace amount of diethyl phosphite residue, so as to obtain the product. The method has the main advantage that paraformaldehyde is used as a methylation reagent and reacts with diethyl phosphite in one step under the action of a catalyst to obtain a target product.

This invention discloses the preparation of a high-efficiency paraformaldehyde sulfonic acid catalyst and its application in the catalytic synthesis of C14 secondary alcohols, relating to the field of olefin catalytic hydration technology. The catalyst is prepared by high-temperature polymerization of p-toluenesulfonic acid and paraformaldehyde under concentrated sulfuric acid catalysis. C14 olefins, the paraformaldehyde sulfonic acid catalyst, isopropanol, and deionized water are added to a reactor, and a catalytic reaction is carried out at a certain temperature. The product conversion rate is 0.46%, and the selectivity is >99%. The catalyst of this invention is simple to prepare, has a well-developed mesoporous structure and sufficient acidic sites, provides mild catalytic hydration reaction conditions, exhibits good olefin conversion and secondary alcohol selectivity, and is easily recoverable and reusable. The process is green and environmentally friendly, with high atom economy, and is beneficial for the industrial conversion and application of high-value utilization of Fischer-Tropsch olefins from coal-to-oil.

The invention relates to an additive manufacturing technology of a refractory metal material, and provides an induction heating degreasing method for 3D pure tungsten printing, which comprises the following steps of: preparing a binder system by taking polystyrene and polyformaldehyde as main binders, polymethyl methacrylate as a secondary binder and stearic acid as a surfactant; a pure tungsten precursor is obtained through a powder extrusion printing technology, and a high-density blocky tungsten sample is prepared through a high-temperature sintering technology after induction heating degreasing. According to the method, the high-performance, high-density and high-uniformity tungsten material can be prepared through the method that the pure tungsten precursor is prepared through the binder capable of being rapidly thermally decomposed and then induction heating degreasing is conducted, the efficiency of traditional thermal degreasing is greatly improved, and it is ensured that the material stably works in the high-temperature and high-radiation environment; the material is suitable for the fields of aerospace, nuclear industry and high-temperature application.

The invention discloses a high-toughening wear-resistant low-noise polyformaldehyde compound and a preparation method thereof, the compound comprises the following raw material components: copolyformaldehyde, thermoplastic polyurethane and organic silicon mixed resin, and the mass ratio of the copolyformaldehyde to the thermoplastic polyurethane to the organic silicon mixed resin is (74-88): (10-20): (1-5). The thermoplastic polyurethane and the organic silicon mixed resin are added and have a synergistic effect, so that the polyformaldehyde composite material has excellent toughness and wear resistance, and meanwhile, the formaldehyde adsorbent, the antioxidant and an extruder vacuum system jointly act, so that the toughness and wear resistance of the polyformaldehyde composite material are improved, and the service life of the polyformaldehyde composite material is prolonged. And free radicals and unstable small molecules generated in the system can be effectively absorbed and eliminated from the system, and internal defects of the polyformaldehyde mixture are reduced, so that the toughness and wear resistance of the polyformaldehyde compound material are improved, and the noise of the polyformaldehyde compound material is reduced.

The present application provides a kind of recovery method and device of dilute aldehyde, the recovery method of dilute aldehyde includes the following steps: adding neutralizing agent to dilute aldehyde raw material liquid, the pH value of dilute aldehyde raw material liquid is 6.2-6.8, then rectification recovery treatment is carried out, obtains trioxymethylene material and heavy component material;Dehydration treatment is carried out to heavy component material, obtains dilute formaldehyde material and waste water material;It can recover the dilute aldehyde generated in trioxymethylene production, improve the recovery efficiency of trioxymethylene and formaldehyde in dilute aldehyde, reduce production cost.