112 results about "FORMALDEHYDE SOLUTION" patented technology

The invention provides a polyglutamic acid granular fertilizer and a preparation method thereof, and the preparation method comprises the following steps: S1, dissolving lignin in an alkaline solution, and heating until the lignin is dissolved; adding epsilon-polylysine fermentation liquor, mixing, heating, adding a formaldehyde solution, and carrying out grafting reaction to obtain epsilon-polylysine grafted lignin; s2, mixing the epsilon-polylysine grafted lignin solution and the gamma-polyglutamic acid solution, adding N-hydroxysuccinimide, standing at a low temperature, adding 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, and mixing; carrying out gradient temperature reaction to obtain lignin grafted epsilon-polylysine / gamma-polyglutamic acid hydrogel; and S3, homogenizing the lignin-grafted epsilon-polylysine / gamma-polyglutamic acid hydrogel, carrying out normal-temperature high-pressure airflow crushing, and spraying the crushed hydrogel to the surfaces of particles obtained by granulating a basic material through high-pressure electrostatic spraying, so as to obtain the polyglutamic acid granular fertilizer. The obtained polyglutamic acid granular fertilizer has relatively strong water-retaining and slow-release (releasing water, urea and the like) effects.

The invention provides a microcapsule type self-early-warning and self-repairing epoxy coating as well as a preparation method and application thereof, and belongs to the technical field of anticorrosive coatings. The method comprises the following steps: mixing urea, resorcinol, ammonium chloride and a polyethylene grafted maleic anhydride aqueous solution, and adjusting the pH value of the mixed solution to obtain a water phase; mixing the PU prepolymer, DCF, TO and ethyl phenylacetate to obtain an oil phase; the water phase and the oil phase are mixed, a formaldehyde solution is added into the mixed solution for a reaction, and microcapsules are obtained; and adding the microcapsule into the epoxy coating to obtain the microcapsule type self-early-warning and self-repairing epoxy coating. According to the microcapsule, PU / UF serves as a shell of DCF and TO, DCF serves as an early warning agent, and TO serves as a repairing agent; the DT coated PU / UF microcapsule has good dispersibility in the coating, when the coating is damaged, the microcapsule is broken to release DCF and TO, the self-early warning and self-repairing performance of the coating is achieved, and metal corrosion is delayed.

The invention relates to a water-soluble ultraviolet absorbent 4-disubstituted aminobenzyl subunit camphorsulfonic acid and a synthesis method and application thereof, and the synthesis method comprises the following steps: in a toluene-methanol mixed solvent, carrying out heating reflux reaction on camphorsulfonic acid and 2 equivalent weight of sodium methoxide, and after enolation conversion is completed, carrying out reduced pressure distillation to obtain the 4-disubstituted aminobenzyl subunit camphorsulfonic acid. Slowly dropwise adding a corresponding 4-disubstituted aminobenzaldehyde solution with the molar weight equal to that of camphorsulfonic acid, continuously heating and stirring to react for 6-12 hours, adding water to terminate the reaction, acidifying the reaction solution by using hydrochloric acid or sulfonic acid type cation exchange resin, separating to remove methylbenzene, adjusting the pH value of a water phase to about 6.5, performing rotary evaporation dehydration under reduced pressure, and extracting a crude product by using a conventional method; a target product can be obtained through column chromatography purification, and the target product not only has water solubility, but also has the characteristic of absorbing UVA and UVB ultraviolet light at the same time; the composition can be applied to sun-screening agent products, cosmetics or home care products, and also can be applied to various industrial products such as paint, varnish, plastics, textiles and rubber to improve the light resistance of the industrial products.

The invention belongs to the technical field of synthesis of extraction agents, and particularly relates to a preparation method and application of amido diphosphinic acid. The preparation method comprises the following steps: (1) mixing a solvent, primary amine, cyclohexylphosphinic acid and inorganic acid, and heating until the solution is clear and transparent; (2) adding a formaldehyde solution or paraformaldehyde into the clear and transparent solution for reaction; and (3) removing a water phase from the mixture obtained after the reaction in the step (2) is finished, dissolving jelly obtained after the water phase is removed by using dichloromethane, and carrying out washing, rotary evaporation and drying to obtain the amido diphosphinic acid.

The invention belongs to the technical field of magnesium ion batteries, and particularly relates to an in-situ synthesized aqueous magnesium ion battery organic composite negative electrode material, a preparation method and a negative electrode. The negative electrode material provided by the invention is a negative electrode material PDBM (at) KB obtained by introducing a formaldehyde solution into a suspension liquid of 2, 5-dihydroxy-1, 4-benzoquinone and conductive carbon which are uniformly mixed, carrying out quinone-aldehyde condensation polymerization under the catalysis of glacial acetic acid and carrying out in-situ synthesis; meanwhile, the distribution of KB in the negative electrode material PDBM (at) KB is further improved through the technological means of ultrasonic dispersion, vacuum infiltration and the like, a rapid ion transmission channel is constructed, the utilization rate of PDBM active substances is remarkably increased, and the aqueous magnesium ion battery with the PDBM / KB as the negative electrode shows high capacity, long circulation, high rate performance and high power performance; therefore, the technical problem that an existing magnesium ion battery electrode material is low in performance is solved.

The application discloses a carbon carrier material for relieving sodium dendrite growth, rich in micropores and closed pore structure, and a preparation method and application thereof, and belongs to the technical field of low-dimensional material energy storage devices. The preparation method comprises the following steps: SO1, cross-linking reaction of a phenol source, a cross-linking catalyst and a formaldehyde solution; SO2, obtaining an impurity-containing sample through a high-temperature carbonization reaction; and SO3, adding the impurity-containing sample into a solvent for soaking, suction filtration, washing and drying to obtain the carbon carrier material. The carbon carrier material prepared by the application is uniformly distributed, the selection and pore size of the pores are adjustable, can effectively provide rich sodium-philic sites for inducing uniform deposition of sodium, and can inhibit the dendrite growth of a sodium metal battery in a cycle process; the pores serve as three-dimensional Na + Transmission channels are beneficial to forming a good ion migration path, reducing the current density of a local material, reducing the possibility of forming dendrites, and improving the safety and service life of the energy storage device.

The invention discloses a photocatalyst for hydrogen production by reforming a formaldehyde solution and a preparation method of the photocatalyst, and belongs to the crossing field of catalyst preparation and a hydrogen energy technology. The photocatalyst is a bimetallic structure material with different Mn and Ni molar ratios, and the molecular formula of the photocatalyst is MnxNiy / C3N4. The preparation method comprises the following steps: adding manganese acetate and nickel chloride in different proportions to adjust the feeding ratio of Mn to Ni in the catalyst, uniformly dispersing the mixture in deionized water containing C3N4, dropwise adding a sodium borohydride solution, continuously stirring to obtain a precursor, and calcining in a hydrogen atmosphere to obtain the catalyst. The photocatalyst can synchronously realize formaldehyde degradation and stable hydrogen production, and the hydrogen production rate can reach 134.53 mmol.h <-1 >. G <-1 >. The photocatalyst shows excellent photocatalytic formaldehyde reforming hydrogen production performance under the mild reaction condition without a sacrificial agent, the problem that a traditional catalyst depends on the sacrificial agent can be solved, and the dual benefits of pollutant degradation and clean energy preparation can be achieved through efficient conversion of formaldehyde.

The invention provides a synthesis method of [1, 3, 5]-triazinane-1, 3, 5-trimethyl triacetate, which comprises the following steps: reacting glycine methyl ester hydrochloride with alkali in a solvent, and separating the generated product to obtain glycine methyl ester and salt; the preparation method comprises the following steps: carrying out efficient cyclization on glycine methyl ester and a formaldehyde solution under the catalysis of a catalyst to generate [1, 3, 5]-triazinane-1, 3, 5-trimethyl triacetate; and gradient separation of the solvent, the by-product and the product is realized through a gradient separation process, so that the high-content trimethyl [1, 3, 5]-triazinane-1, 3, 5-triacetate is obtained.

The application belongs to the technical field of diamine and polyamine of diphenylmethane series, and particularly relates to a preparation method of diamine and polyamine (DAM) of diphenylmethane series, that is, before a condensation reaction, a mixing characteristic parameter 1.0<=M<=1.5 of a pre-reaction liquid for the condensation reaction is controlled; the pre-reaction liquid is a mixed liquid formed after a mixture of a formaldehyde solution and aniline hydrochloride or a mixture of the formaldehyde solution and aniline hydrochloride / condensation reaction liquid is pre-mixed. In the method, the mixing characteristic parameter M is controlled in a suitable range, so that the content of N-methyl impurities and the content of macromolecular polymers in the DAM product can be maximally reduced, and the running stability of a production device and the quality of downstream products can be improved.

The application belongs to the technical field of electronic materials, and particularly relates to a high-conductivity silver / graphene composite solute and a preparation method thereof. The method comprises the following steps: acidizing graphene to obtain an acidized graphene dispersion liquid; mixing the acidized graphene dispersion liquid with a formaldehyde solution to perform an aldehyde reaction, and obtaining an aldehyde graphene dispersion liquid; mixing the aldehyde graphene dispersion liquid with a silver-ammonia solution to perform a silver mirror reaction, and obtaining a silver / graphene composite solute. The graphene is subjected to acidization and aldehyde treatment, and then is subjected to a silver mirror reaction with a silver-ammonia solution to form a silver / graphene composite solute. A small amount of the prepared silver / graphene composite solute is added to commercial silver paste, which not only optimizes the conductive path of the silver paste, but also effectively reduces the porosity problem in the sintering process, thereby significantly enhancing the electron transmission performance, greatly improving the conductivity of the silver paste, and finally promoting the solar cell to achieve higher photoelectric conversion efficiency.

The invention provides a method for synchronously preparing adsorption materials with different functions by modifying waste straws, and belongs to the technical field of material science. The method comprises the following steps: mixing straw, an alkali solution 1 and a formaldehyde solution to obtain a first mixture, and then heating to carry out a reaction 1; after the reaction 1 is finished, adding a sodium sulfite solution into the reaction system to obtain a second mixture, and then heating to carry out a reaction 2; after the reaction 2 is finished, carrying out solid-liquid separation to respectively obtain a first solid and a first liquid; mixing the first solid with an alkali solution 2 to obtain a third mixture, and then heating for reaction 3; after the reaction 3 is finished, adding a first reaction solution into the reaction system, and heating for reaction 4 to obtain resin; and adding a second reaction solution into the first liquid, and heating for reaction 5 to obtain the hydrosol. According to the method, the waste liquid is subjected to solution polymerization by utilizing the solvent characteristic of straw pretreatment, so that all-component utilization of the straw and modification of the waste liquid are realized.

This application provides a continuous titration method for the sulfuric acid and ammonium nitrate content of silicon etching solution. The continuous titration method includes the following steps: weigh m grams of silicon etching solution sample into a sample bottle, add phenolphthalein indicator, titrate with a first sodium hydroxide standard solution of concentration C1 until a pink color is achieved, and record the volume consumed V1. Calculate the sulfuric acid content. Add neutral formaldehyde solution to the same solution and let it stand for a first preset time to generate a free acid solution. Continue titrating the free acid solution with a second sodium hydroxide standard solution of concentration C2 until the solution turns pink. Gently heat the solution to a preset temperature and maintain this temperature for a second preset time. If the pink color persists, the titration endpoint is determined, and the volume consumed V2 is recorded. Calculate the ammonium nitrate content. This method achieves continuous titration of two components with a single sample, eliminates mutual interference between components, optimizes the endpoint determination method, and thus achieves a simple operation, high accuracy, low sample consumption, and high detection efficiency.

The invention belongs to the technical field of melamine modified urea-formaldehyde rubber powder, and particularly relates to ENF-grade melamine modified urea-formaldehyde rubber powder as well as a preparation method and application thereof. The ENF-grade melamine modified urea-formaldehyde rubber powder is prepared from the following components in parts by weight: 50 to 60 parts of urea, 90 to 110 parts of a formaldehyde solution, 10 to 15 parts of melamine, 0.2 to 0.5 part of hyperbranched polyglycerol and 10 to 20 parts of a cellulose porous material. The specific hyperbranched polyglycerol and cellulose porous material are adopted, under the specific preparation method, the melamine modified urea-formaldehyde glue powder with the low free formaldehyde content can be obtained, the formaldehyde emission of the prepared plywood is smaller than 0.025 mg / m, the ENF-level requirement is met, and meanwhile the plywood has the excellent bonding strength and water resistance.

A process for the preparation of N-methylmorpholine comprising continuously feeding morpholine, a formaldehyde solution and hydrogen to at least one reactor containing a heterogeneous hydrogenation catalyst comprising cobalt and copper, and subjecting the morpholine and formaldehyde to reductive amination to obtain N-methylmorpholine wherein the fed formaldehyde solution is a formaldehyde methanol solution.

Provided in the present invention is a preparation method for monodisperse nanometer beryllium oxide, comprising the following steps: (S1) uniformly mixing urea and an aqueous formaldehyde solution, adjusting the pH with an organic amine to be weakly alkaline, and adding hydroxyalkyl (meth)acrylate, C12-16 alkyl (meth)acrylate and polyethylene glycol diacrylate to obtain a premix; (S2) adding a water-soluble beryllium salt to the premix, and under an inert atmosphere, adding a water-soluble initiator and slowly raising the temperature to 60-80°C for reaction to obtain a gel precursor; and (S3) after the gel precursor is dried, calcining same, washing same, and filtering same to obtain monodisperse nanometer beryllium oxide. The present invention involves a simple process and low costs, and the obtained beryllium oxide is nanoscale and has a monodisperse particle size.

The invention discloses a method for visual detection of formaldehyde by using double-nitrogen-source-doped fluorescent carbon quantum dots, which comprises the following steps: pre-treating Cunninghamia lanceolata as a precursor material; adding urea and o-phenylenediamine as nitrogen sources, and preparing the pretreated precursor material into a spruce carbon quantum dot solution through a hydrothermal synthesis method; filtering, centrifuging, dialyzing and freeze-drying the spruce carbon quantum dot solution to obtain carbon quantum dot solid powder; the method comprises the following steps: mixing carbon quantum dot solid powder with deionized water to obtain a carbon quantum dot detection solution, adding formaldehyde solutions with different concentrations into the carbon quantum dot detection solution, and emitting light with different colors under an ultraviolet lamp to realize visual detection of formaldehyde. According to the method, common biomass raw materials are used for preparing the carbon quantum dots, the method has the advantages of being environmentally friendly and high in formaldehyde reaction speed, the defects that an existing formaldehyde detection equipment method is high in cost, low in detection speed and poor in visualization are overcome, and a brand new thought is developed for formaldehyde visual detection.

The present application belongs to the technical field of polymer porous foaming material and semiconductor precision cleaning consumables, and particularly relates to a PVA porous foaming material, a preparation method and a semiconductor wafer cleaning brush. The preparation method provided by the present application does not need to use solid particle pore-forming medium, polyvinyl alcohol is dissolved in water to form a glue solution, a surfactant and an acidic catalyst are added to adjust pH and filter, inert gas is introduced for foaming, a formaldehyde solution is added, and the product is obtained through gradient temperature solidification, demolding cleaning and drying. The PVA porous foaming material prepared by the present application has a regular and uniform multi-stage pore structure, the main foam holes are nearly spherical and interconnected to form a three-dimensional network structure. The prepared semiconductor wafer cleaning brush has excellent hydrophilicity, flexibility, high elasticity and high rebound characteristics, no particle precipitation and debris shedding occur in the use process, can meet the ultra-high cleanliness requirement of high-end semiconductor processes, simultaneously simplifies the production process, reduces the environmental protection cost, and has a good industrial application prospect.

The utility model discloses a sterilizer based on ozone strengthening after steam formaldehyde primary elimination, which belongs to the technical field of formaldehyde sterilization equipment, and comprises a box body, a sterilization cavity is arranged on the box body, one side of the sterilization cavity is connected with a baffle plate, and a groove is arranged on the baffle plate. The formaldehyde sterilization device has the beneficial effects that the formaldehyde delivery pump, the formaldehyde solution storage tank, the steam generator and the softened water tank are arranged, and a formaldehyde solution is put into the air outlet pipe connected with the steam generator, so that the formaldehyde solution is vaporized into gas through steam, and the sterilization effect on put articles is better; the sterilization cavity can be rapidly filled with discharged steam, formaldehyde and ozone due to the special shape, ozone can be conveniently put into the sterilization cavity after steam formaldehyde sterilization by arranging the ozone generation equipment and the oxygen storage tank, so that articles put into the sterilization cavity are sterilized in a reinforced manner, and the put formaldehyde is treated.

The application discloses a processing technology of ethyl dicyanopropionate, and comprises the following specific steps: S1, preparing raw materials, storing liquid raw materials uniformly for standby, and placing solid raw material ethyl cyanoacetate in a humid environment with certain humidity to make it lump; S2, pre-treating the lumped ethyl cyanoacetate by using a pre-treatment device, and then crushing the lumped ethyl cyanoacetate after component separation; S3, mixing the ethyl cyanoacetate with a potassium cyanide solution, and then slowly adding a formaldehyde solution into the mixture for reaction; S4, separating the organic layer from the reaction liquid, extracting the water layer by using a solvent dimethyl sulfoxide, mixing the organic layers, and finally obtaining ethyl dicyanopropionate finished products after drying and desolventizing; in the step S2, the pre-treatment device comprises a storage mechanism, a high-frequency vibration device and an ejection mechanism; the processing technology of ethyl dicyanopropionate disclosed by the application has the effect of reducing the exposure amount of dust, thereby providing effective protection for the personal safety of workers.

The invention discloses a chemical crosslinking modified cellulose-based hard carbon material and a preparation method and application thereof.The preparation method comprises the steps that cellulose I is placed in a formaldehyde solution to be subjected to chemical crosslinking treatment, then multi-stage continuous carbonization is conducted in an inert atmosphere, and the chemical crosslinking modified cellulose-based hard carbon material is obtained and used for preparing a sodium-ion battery negative electrode material. Cellulose I in a specific crystal form is used as a raw material, formaldehyde is used as a cross-linking agent, a linear molecular chain structure in the cellulose I is modified into a cross-linked network structure, long-range graphitization of a carbon layer in the carbonization process is hindered, bending of the carbon layer is induced, and the hard carbon material rich in closed pore structure is obtained. Rich active sites are provided for storage of sodium ions under low voltage, the low-voltage platform capacity of hard carbon in the battery charging and discharging process is improved, and the requirement of a high-energy-density sodium ion battery for high-performance hard carbon is met.

This invention relates to the field of adhesive technology and discloses an anti-aging phenolic resin-based urea-formaldehyde adhesive and its preparation method. The adhesive is composed of 95-100 parts phenol, 120-160 parts 37% formaldehyde solution, 80-110 parts urea, 3-4.5 parts modifier, 1.5-1.8 parts curing agent, and 1.8-2.2 parts anti-aging agent. The preparation method includes four steps: preparation of phenolic resin prepolymer, preparation of urea-formaldehyde resin prepolymer, composite modification, and post-treatment. This invention, through the synergistic effect of composite modification and anti-aging agent, solves the defects of traditional urea-formaldehyde adhesives, such as high formaldehyde release, poor anti-aging performance, and insufficient water resistance, while possessing excellent environmental friendliness, adhesion, and durability, making it suitable for fields such as the production of engineered wood products.

The invention belongs to the technical field of activated carbon, and particularly relates to a preparation method of high-specific-capacitance activated carbon for a supercapacitor. The preparation method comprises the following steps: carbonizing coconut shells, crushing, uniformly mixing the obtained carbonized crushed material with an alkali activator, pre-activating, and grinding to obtain a pre-activated material; the pre-activation condition is inert atmosphere, the temperature is 450-550 DEG C, and the temperature is kept for 0.5-1.5 h; the preparation method comprises the following steps: dissolving phenolated lignin in alkali liquor, adding pyridine diamine and a formaldehyde solution, uniformly mixing and reacting to obtain phenolated lignin modified amine; adding phenolated lignin modified amine, dialdehyde and a catalyst into an organic solvent, uniformly mixing, adding the pre-activated material, performing ultrasonic dispersion, and performing heating reflux reaction to obtain a coated modified pre-activated material; and activating the coated modified pre-activated material, pickling, washing and drying to obtain the high-specific-capacitance activated carbon for the supercapacitor. The phenolated lignin modified amine and the dialdehyde are cured and crosslinked on the inner wall and the surface of the pores of the pre-activated material, and the nitrogen-doped mesoporous carbon is formed through activation, so that the situation that nitrogen functional groups are introduced into pseudocapacitance due to excessive etching of the initial pores of the pre-activated material is avoided.

The invention belongs to the technical field of adsorption materials, and particularly relates to a preparation method and application of a novel adsorption material. The preparation process of the novel adsorption material provided by the invention comprises the following steps: dissolving chitosan in an acetic acid solution to prepare a chitosan-acetic acid solution, then adding the chitosan-acetic acid solution into a sodium hydroxide solution to form gel beads, and further pre-crosslinking the formed gel beads in a formaldehyde solution, and crosslinking in a sodium tripolyphosphate solution. The novel adsorption material provided by the invention is low in cost, can be used for treating heavy metal-containing pollutants such as RR24 in a water body, has double adsorption effects of physical adsorption and chemical adsorption, and has the advantages of large adsorption capacity, high material strength, strong stability and the like, and the obtained product is a gel bead, is convenient to recover and is suitable for industrial production. The method has a good application prospect in the field of water environment treatment.

This utility model discloses a leak-proof double-layer formaldehyde solution ton container, relating to the technical field of formaldehyde solution ton containers. It includes an inner container with a protective mechanism on its outer side. The protective mechanism includes an outer container, with a gas storage tank fixedly connected to its top. A warning light is fixedly connected to the upper surface of the gas storage tank. A safety valve is fixedly connected to the top of the inner container, and a discharge pipe is fixedly connected to the output end of the safety valve. The end of the discharge pipe away from the safety valve is fixedly connected to the right side of the gas storage tank. An inlet is fixedly connected to the top of the inner container, with a sealing cap threaded onto its outer surface. Several identical first buffer plates are fixedly connected to the outer surface of the inner container. Through its double-layer structure design, the inner container directly holds the formaldehyde solution, while the outer container acts as a secondary protective barrier. Even if the inner container is accidentally damaged, the outer container can temporarily contain the leaked solution, preventing direct leakage to the outside, thus structurally reducing the risk of formaldehyde leakage.

This invention discloses a non-destructive testing method and system for formaldehyde residue in aquatic products, belonging to the field of formaldehyde detection technology. The method includes the following steps: Raman spectroscopy is performed on aquatic product samples soaked in formaldehyde solutions of different concentrations to determine the formaldehyde residue and construct a formaldehyde residue dataset; different models are used to classify the Raman spectral formaldehyde residue data, and the model performance is evaluated by classification accuracy, with the InceptionTime model selected as the classification model; Raman spectroscopy is performed on aquatic product samples soaked in formaldehyde-like substances, and a selective dataset is constructed using mixed data; the selective dataset is used to verify the selectivity of the classification model for formaldehyde; the optimal spectral preprocessing method is selected to optimize the model structure; and the classification results of the classification model are verified and analyzed. This invention uses deep learning to provide an accurate, simple, and economical method for detecting formaldehyde in aquatic products, with broader application prospects in food safety.

The utility model relates to a biological specimen material pool which comprises a pool body, the pool body is provided with a containing cavity, and a pool opening is formed in the upper portion of the pool body. The drain pipe is communicated below the tank body; the tank cover is hinged above the tank body; the driving structure is arranged on the pool body and connected with the pool body, and the driving structure drives the pool cover to cover the pool opening or the pool cover is turned over relative to the pool body to open the pool opening; the blending tank is provided with a first liquid inlet and a second liquid inlet, the first liquid inlet is used for adding a formaldehyde solution into the blending tank, and the second liquid inlet is used for adding water into the blending tank; a communicating pipe is arranged at the bottom of the blending tank, the communicating pipe is communicated with the accommodating cavity of the tank body, and a switch valve is arranged on the communicating pipe; the stirring mechanism is arranged in the blending tank; and after the materials are uniformly blended, the materials enter the accommodating cavity of the tank body through the communicating pipe.

The invention discloses environment-friendly melamine decorative paper and a preparation method thereof, and belongs to the technical field of impregnated paper. The method comprises the following steps: pulping composite plant fibers, adding aminated nanocellulose, modified zeolite powder, polyamide epichlorohydrin resin and polyacrylamide, and carrying out papermaking to obtain functional base paper; the preparation method comprises the following steps: reacting a formaldehyde solution with melamine, and adding castor oil-based polyol, a formaldehyde catching agent and a cross-linking accelerant to prepare modified melamine formaldehyde resin; functional base paper is soaked in the resin, and a finished product is obtained through drying and hot pressing. The formaldehyde emission of the obtained decorative paper is as low as 0.004 mg / L, the tensile strength is remarkably improved, the decorative paper has high strength and good toughness and is excellent in wear resistance and water resistance, and the process is compatible with an existing production line, environmentally friendly and suitable for industrial production.

The invention relates to the technical field of adhesives for coated abrasive tools, and discloses a preparation method of a bio-based composite adhesive, an adhesive composition and abrasive cloth, the adhesive is prepared from the following raw materials in parts by mass: phenol, a formaldehyde solution, enzymatic hydrolysis lignin, ethylene glycol, sodium hydroxide, ammonia water, urea, boric acid, other auxiliaries and water; the preparation method comprises the steps of pre-swelling and resin synthesis. Through a pre-swelling process that ammonia water and sodium hydroxide are matched to control alkalinity, not only can complete activation of enzymatic hydrolysis lignin be achieved, but also the characteristic of low ash content of the enzymatic hydrolysis lignin can be matched, it is ensured that the adhesive has extremely low ion mobility and stable dielectric constant, the requirement of an electrostatic sand planting process is met, and accurate orientation of abrasive particles is achieved in a matched mode. The reduction of the use amount of sodium hydroxide also avoids the reduction of moisture absorption and thermal creep resistance of an adhesive layer caused by alkali metal ion residues, and solves the problem that conventional lignin is difficult to apply to the adhesive for high-precision abrasive cloth.

The utility model relates to the technical field of urea formaldehyde compound fertilizer production, and discloses a urea formaldehyde preparation system, which comprises a reaction tank and an intermediate tank, the reaction tank is communicated with a water inlet pipe, an air inlet pipe, a feed inlet and a liquid outlet pipe; a first conveying pump is arranged on the liquid outlet pipe; the other end of the liquid outlet pipe is communicated with a middle tank, the middle tank is communicated with a discharging pipe, a second conveying pump is arranged on the discharging pipe, a plurality of spray heads are arranged at the other end of the discharging pipe, and the spray heads extend into a secondary dryer or a granulator. According to the scheme, urea and formaldehyde react to form the urea formaldehyde solution, and then the urea formaldehyde solution is sprayed on the surface of the compound fertilizer to form the urea formaldehyde slow-release compound fertilizer, so that the coating uniformity of urea formaldehyde on the surface of the compound fertilizer is effectively improved, and the slow-release uniformity of the urea formaldehyde compound fertilizer is improved.

This utility model discloses a formaldehyde solution purification storage tank equipped with a filtration structure. This utility model relates to the technical field of formaldehyde solution storage equipment. The formaldehyde solution purification storage tank with a filtration structure includes a tank body. A fixed connecting pipe is fixedly connected to the right side of the outer circumference of the tank body, and the fixed connecting pipe communicates with the tank body. This utility model, through the filtration mechanism and the internally embedded filter screen assembly, forms a filtration structure that can effectively filter formaldehyde solution, improve the filtration effect, ensure the purity of the formaldehyde solution, and meet the demand for high-quality formaldehyde solution storage. Through the cooperation of the guide rail assembly, adjusting push rod, and moving bracket, the insertion ring assembly on the outside of the movable joint can be easily separated from the positioning slot of the filtration mechanism, thereby easily removing the filtration structure for cleaning or replacement. The operation is simple and convenient, avoiding a significant decrease in filtration capacity after long-term use.