178 results about "Melamine formaldehyde resin" patented technology

The invention provides a preparation method of high-viscosity water-soluble melamine formaldehyde resin, which comprises the following steps: adding a first part of formaldehyde solution and water into a reaction kettle, fully and uniformly stirring, adjusting the pH value of the system in the reaction kettle, and controlling the reaction temperature in the reaction kettle at 25-30 DEG C; adding polyvinyl alcohol into the reaction kettle, raising the temperature in the reaction kettle to 48-52 DEG C, and keeping the temperature for 10-30 minutes; slowly raising the temperature in the reaction kettle to 90 DEG C, adding melamine and an environment-friendly accelerant into the reaction kettle, stirring and preserving heat for 8-12 minutes, and adding a melamine prepolymer modifier into the reaction kettle; adding a first part of formaldehyde solution into the reaction kettle, controlling the reaction temperature in the reaction kettle to be 92-95 DEG C, adding a second part of formaldehyde solution into the reaction kettle after reacting for 10 minutes, continuously stirring, and controlling the reaction temperature in the reaction kettle to be quickly reduced to 58-62 DEG C; and adding urea into the reaction kettle, naturally cooling to room temperature, and discharging glue. The melamino-formaldehyde resin prepared by the invention has the advantages of high viscosity, good water solubility, low free formaldehyde and longer storage life.

The invention provides a polyurethane material for leaking stoppage of a coal mine and a preparation method of the polyurethane material, and belongs to the technical field of polyurethane. The preparation method comprises the following steps: preparing melamine formaldehyde resin balls and ZnAl-LDHs, mixing and reacting the melamine formaldehyde resin balls and the ZnAl-LDHs to prepare LDH-MF composite balls, dipping in an iron salt solution, calcining to prepare composite balls, chloridizing with thionyl chloride, reacting with an ionic liquid and hyperbranched polyester to prepare IL / G composite balls, mixing with polyether polyol and a catalyst, adding into water, adding a foaming agent and silicone oil, heating, stirring and mixing, transferring into a mold, and carrying out extrusion molding to obtain a finished product. And adding diisocyanate, foaming, cooling to room temperature, drying and curing to obtain the polyurethane material for leaking stoppage of the coal mine. The prepared polyurethane material for leaking stoppage of the coal mine has good mechanical property, high temperature resistance and antibacterial property, good flexibility, good antistatic property and obviously improved flame retardance, and has a wide application prospect.

The low-VOC modified melamine formaldehyde resin is prepared from the following components in parts by weight: 80 to 100 parts of melamine formaldehyde resin, 5 to 10 parts of hydroxyl-terminated hyperbranched polyester, 8 to 15 parts of epoxy-terminated polybutadiene, 1 to 3 parts of fumed silica, 5 to 15 parts of polyvinyl butyral, 0.1 to 0.2 part of a coupling agent, 1 to 3 parts of a catalyst and 2 to 5 parts of a cross-linking agent, the preparation method comprises the following steps: in a stirring state, adding hydroxyl-terminated hyperbranched polyester, epoxy-terminated polybutadiene, a polyvinyl butyral resin solution and coupling agent modified fumed silica into a melamino-formaldehyde resin solution, heating to 50-70 DEG C, and adding a catalyst and a cross-linking agent; the melamine modified resin prepared by the components and the preparation method has the characteristics of low formaldehyde volatilization, high toughness and durability.

The invention discloses water-based colored paint for automobiles as well as a preparation method and application of the water-based colored paint. The water-based colored paint is prepared from the following raw materials in parts by weight: 10 to 15 parts of water-based polyurethane dispersion, 5 to 9 parts of water-based hydroxy acrylic acid dispersion, 4 to 8 parts of melamine formaldehyde resin, 2 to 4 parts of color paste, 1 to 2 parts of aluminum paste, 2 to 3 parts of pearlescent pigment, 15 to 30 parts of deionized water and an organic solvent, the organic solvent comprises 6-8 parts of a high-boiling-point alcohol ether solvent and 2-4 parts of a swelling type solvent. The water-based colored paint for the automobile, provided by the invention, is generally used for coating an outer plate and an inner plate of an automobile body, and can be used for well improving the appearance of a coating film formed by spraying the inner plate and overcoming the problems of gloss loss and the like of the coating film when a static-free compressed air machine arm is used for spraying the inner plate of the automobile body.

The invention discloses a method for catalyzing melamino-formaldehyde resin methylation reaction by solid acid. According to the invention, epoxy silane coupling agent grafted modified nanocellulose is introduced into sulfonated styrene-divinyl benzene cross-linked copolymer microspheres for in-situ crystal cross-linking, so that the problems that the traditional sulfonated polystyrene resin is poor in mechanical strength and solution solubility resistance, low in cycle index, easy to swell and fall off and the like are effectively solved; the prepared solid acid resin has the characteristics of high reaction activity, high proton transfer rate, high mechanical strength, high cyclicity and easiness in solid-liquid separation, and by utilizing the solid acid resin to catalyze the etherification reaction of the melamino-formaldehyde resin, the reaction temperature and the production energy consumption are reduced, the reaction time is shortened, the product quality and the production efficiency are improved, and the production cost is reduced. The problems of environmental protection and energy consumption caused by the generation of a large amount of VOCs in the etherification reaction of the traditional liquid catalyst for synthesizing the high-etherified melamine formaldehyde resin and the by-product inorganic salt in the subsequent process are solved.

The invention discloses a micro-fluidic technology-based double-shell microcapsule fire extinguishing agent and a preparation method thereof, and belongs to the technical field of fire extinguishing agents. A low-boiling-point liquid fire extinguishing agent serves as a capsule core, a polyurethane material prepared through the microfluidic technology serves as a first layer shell, flame-retardant materials such as melamine formaldehyde resin serve as a second layer shell, the capsule core is coated with the first layer shell, the first layer shell is coated with the second layer shell, and the double-shell microcapsule fire extinguishing agent based on the microfluidic technology is obtained. Microencapsulation of the low-boiling-point liquid fire extinguishing agent can be well achieved through the micro-fluidic technology, the obtained single-shell-layer microcapsule fire extinguishing agent is complete in structure, compact in shell layer, uniform in particle size and good in dispersity, the good flame retardant effect can be achieved through introduction of the second-layer shell resin type flame retardant material, and the heat stability of the microcapsule fire extinguishing agent is improved.

The invention relates to the technical field of traffic engineering, in particular to a self-repairing type warm-mixing flame-retardant microcapsule and an asphalt mixture, and the microcapsule comprises a core material and a shell material; the composite material is characterized in that the core material comprises a self-repairing component and a warm mixing functional component, the self-repairing component is at least one of sulfur, epoxy resin or recycled asphalt, the warm mixing functional component is an organic wax-montmorillonite composite component, and montmorillonite is modified by a silane coupling agent; the shell material is at least one of ammonium polyphosphate, melamine formaldehyde resin or nano aluminum hydroxide, and nano silicon dioxide particles of which the surfaces are grafted with azobenzene groups are loaded on the surface of the shell material; through cooperation of multiple components, a light, mild and stress triple triggering mechanism is constructed, core material release is accurately regulated, warm mixing, self-repairing and flame-retardant components are mutually promoted, the repairing efficiency and flame-retardant durability are improved, efficient function coupling is achieved, and the pavement performance is optimized.

The invention discloses a rare earth element doped composite phase change material and a preparation method thereof. The preparation method comprises the following steps: mixing yttrium nitrate with a dysprosium nitrate solution, adjusting the pH value to 10, and heating and precipitating to prepare rare earth doped nanoparticles; the preparation method comprises the following steps: dissolving a polyurethane prepolymer and a rare earth coordination compound in dimethylformamide, and stirring to form a uniform solution; melting paraffin, adding nanoparticles and a surfactant, and carrying out ultrasonic dispersion; mixing the mixture with a disulfide bond-containing polyurethane solution, and adding a cross-linking agent to form a precursor; and finally, carrying out microencapsulation on the melamine-formaldehyde resin to obtain the composite material. The latent heat capacity of the material reaches 175-182J / g, the thermal conductivity is 0.40-0.46 W / (m.K), the mechanical strength is 11.8-12.5 MPa, and the thermal cycle stability is 93-96%.

The invention discloses a polyolefin cable material for an energy storage cable and a preparation method thereof, and relates to the technical field of cable materials, the polyolefin cable material comprises the following preparation raw materials by mass: 30-55 parts of matrix resin, 40-70 parts of a flame retardant, 2-10 parts of a compatible flexibilizer, 1-8 parts of a smoke suppressant and 1.0-5.0 parts of a processing aid; the flame retardant comprises coated aluminum hypophosphite and ceramic powder; the ceramic powder is mullite powder treated by amino silicon oil, and the coated aluminum hypophosphite is aluminum hypophosphite coated by ammonium polyphosphate and melamine-formaldehyde resin. The preparation method comprises the following steps: S1, preparing the raw materials according to the required ratio, premixing the matrix resin, and thermally mixing the other preparation raw materials to obtain a premix; and S2, carrying out melt blending, extrusion, cooling and grain-sized dicing on the premix to obtain the polyolefin cable material for the energy storage cable. The polyolefin cable material for the energy storage cable has the advantages of being high in toughness and free of molten drops on the basis of being high in flame retardance and low in fuming property.

The invention relates to a microencapsulated thermochromic material. The microencapsulated thermochromic material comprises an inner core and a shell coating the inner core, the shell is prepared from melamine formaldehyde resin and anti-ultraviolet composite particles according to the volume ratio of (70 to 60) to (30 to 40); the inner core is a mixture of an electron transfer type organic compound and an inorganic phase change reinforcing agent, and the inorganic phase change reinforcing agent is composed of TiO2 loaded with 5-15 wt% of AgI nanoparticles; the anti-ultraviolet composite particles are formed by grafting silane coupling agent modified nano zinc oxide and a benzotriazole ultraviolet absorbent. The invention further relates to a color-changing floor prepared from the microencapsulated thermochromic material, and the color-changing floor is good in weather resistance and high in heat stability and temperature sensitivity.

The invention discloses an adsorption material for high-humidity and high-temperature iodine-containing aerosol and a preparation method thereof.According to the prepared adsorption material, polymers such as melamino-formaldehyde resin serve as a three-dimensional porous framework, and the adsorption material is prepared through a mild one-step solution processing method; an ionic polyimine network based on a lysine salt ionic liquid and carbonyl-rich polyvinylpyrrolidone are compounded on a skeleton in situ to form a porous adsorbent, and the porous adsorbent realizes efficient capture of elemental iodine (I2), methyl iodide (CH3I) and iodine aerosol through a synergistic mechanism of electrostatic induced adsorption and in-situ packaging and curing, so that the adsorption efficiency is improved, and the adsorption efficiency is improved. Under the harsh industrial conditions that the temperature is 100 DEG C or above and the relative humidity is 90% or above, the dynamic adsorption capacity to iodine reaches up to 160.7 wt%, the filtering efficiency is kept 99.8% or above, meanwhile, excellent iodine retention stability, recoverability and large-scale preparation potential are achieved, and an efficient, low-cost and practical solution is provided for treatment of radioactive iodine in nuclear waste gas.

This invention belongs to the field of wastewater treatment technology and discloses a mechanical catalytic treatment method and system for wastewater and contaminated groundwater. The mechanical catalytic treatment method for wastewater and contaminated groundwater includes the following steps: adding a treatment agent to the wastewater to be treated, mixing and reacting, filtering, and completing the wastewater treatment; wherein, the treatment agent includes at least one of piezoelectric catalytic material and magnetic resin; the mixing reaction is carried out under ultrasonic cavitation and / or spiral aeration conditions; the piezoelectric catalytic material includes a porous plant cellulose fiber carrier and a C3N5 functional layer in situ grown on the surface of the carrier; the magnetic resin includes a benzo-melamine-formaldehyde resin matrix with sulfonic acid groups bonded to a benzene ring and Fe3O4 magnetic nanoparticles uniformly dispersed in the resin matrix. This invention eliminates the need for chemical agents in wastewater treatment, avoids secondary pollution, effectively treats complex water bodies while reducing operating costs, and possesses good environmental friendliness and practicality.

This application relates to a highly acid and alkali resistant pigment, Red 48:1, and its preparation process, belonging to the field of chemical pigment manufacturing technology. The pigment is prepared from 2B acid, sodium nitrite, 2,3 acid, a barium-lanthanum-calcium multimetallic salt component, aminotrimethylenephosphonic acid, zirconium salt, melamine-formaldehyde resin prepolymer, epoxy resin emulsion, silane coupling agent, and surfactant. The preparation process includes sequential diazotization and coupling reactions, followed by a co-lake reaction with the addition of multimetallic salts; then interfacial anchoring via aminotrimethylenephosphonic acid, and inorganic deposition hybridization via droplet addition of zirconium salt; finally, a staged crosslinking coating reaction is performed with the aforementioned resin and coupling agent. This invention constructs an inorganic-organic hybrid coating layer in situ on the pigment core surface of the multimetallic lake, physically blocking the penetration pathways of acid and alkali ions, thus improving the pigment's resistance to acid and alkali bleeding and its resistance to ultraviolet aging.

The present invention discloses a method for using a hollow mesh flexible carbon sponge transition layer to assist in the brazing of fiber-reinforced composite materials or ceramics with metals. The present invention utilizes vacuum rapid carbonization to treat melamine formaldehyde resin foam to obtain a carbon sponge material with a low thermal expansion coefficient, high mechanical flexibility, and a hollow network structure. During the brazing process using the carbon sponge material as a transition layer, the liquid solder will spontaneously perform capillary infiltration on the carbon sponge and completely fill it, forming an in-situ composite core-sheath structure in which a continuous network of carbon sponge (shell) wraps the solder alloy (core). This structure combines the advantages of the carbon sponge material's low thermal expansion coefficient, high elastic strain energy, and good plasticity of the metal material, giving the transition layer an overall excellent plastic toughness. This method can effectively improve the interface structure, increase the plastic toughness of the brazing seam, and reduce the thermal expansion coefficient of the brazing seam, significantly improving the mechanical properties of the fiber-reinforced composite material or ceramic and metal joints.

The invention discloses melamine formaldehyde resin and a production process thereof, and belongs to the technical field of high polymer materials. The production process comprises the following steps: carrying out a reaction on melamine and 2, 5-furandicarbonyl chloride to generate an intermediate, carrying out a condensation polymerization reaction on the intermediate, the melamine and formaldehyde, and adding a polyvinyl alcohol-metal complex for common condensation polymerization to form the melamine formaldehyde resin. 2, 5-furandicarbonyl chloride of a biological source is used for replacing part of formaldehyde, the content of methanol is reduced, meanwhile, a hydroxymethyl crosslinking site at one end of a furan ring can be closed, the crosslinking density is reduced, and the toughness is improved. Under the condition that the reaction energy is reduced by the metal ions, the polyvinyl alcohol and the formaldehyde are subjected to aldolization to block free formaldehyde; the coordination effect of metal ions and furan rings further promotes the crosslinking of polyvinyl alcohol and melamino-formaldehyde molecular chains, and the flexible long chain of the introduced polyvinyl alcohol reduces the brittleness of the resin material.

The invention relates to the technical field of coatings, in particular to a boiling-resistant bisphenol-A-free stoving varnish protective coating for a vacuum cup and a preparation method of the boiling-resistant bisphenol-A-free stoving varnish protective coating. Polyester resin and methylated melamino-formaldehyde resin are adopted to form a compact main network, and nano silicon dioxide reinforcing slurry permeates into the network; according to the present invention, based on the two dimensions of the body permeation resistance and the interface stripping resistance, the excellent boiling resistance is achieved, and the coating does not have the blistering or shedding phenomenon after the boiling test.

The invention relates to a paraffin modified organic silicon pressure-sensitive adhesive with viscosity switching triggered by temperature, and belongs to the technical field of pressure-sensitive adhesives. The preparation method comprises the following steps: by taking high-temperature wax as a core material and melamine-formaldehyde resin and a KH-550 modified nano boron nitride hybrid shell layer as wall materials, obtaining a phase change microcapsule by adopting an in-situ polymerization method, and then grafting Mal-PEG2-COOH to obtain a modified phase change microcapsule; the preparation method comprises the following steps: forming an intermediate from isocyanate propyl triethoxy silane and furfuryl amine, hydrolyzing to modify an organic silicon pressure-sensitive base adhesive, and preparing the organic silicon pressure-sensitive adhesive from the modified organic silicon pressure-sensitive base adhesive and the modified phase-change microcapsules. The DA reaction is performed at normal temperature to form a covalent cross-linked network, so that the pressure-sensitive adhesive is endowed with high-strength adhesive property; during heating, paraffin melting and DA reverse reaction cooperate to reduce viscosity, and viscosity switching triggered by temperature is achieved; and the modified nano boron nitride can accelerate temperature response and enhance the mechanical property of the microcapsule. The organic silicon pressure-sensitive adhesive prepared by the invention has the effect of temperature-triggered viscosity switching.

The invention discloses a high-strength paper packaging material and a preparation method thereof, and relates to the technical field of paper pulp molding.The preparation method comprises the following steps that waste paper is crushed and then mixed with bamboo fibers and nanocellulose for pulping, a chitosan solution, melamino-formaldehyde resin, gamma-aminopropyltriethoxysilane, alums and glycerinum are added to prepare forming slurry, and the forming slurry is prepared; performing vacuum adsorption to form a wet blank, preheating a hot press, putting the wet blank into a hot pressing mold, covering the wet blank with the polyvinyl alcohol-sodium alginate composite film, setting pressure and hot pressing time, and after hot pressing is finished, slowly relieving pressure to obtain a formed blank; and putting the formed blank into a blast oven, drying, taking out a dried sample, and standing at room temperature to balance moisture, so as to obtain the high-strength paper packaging material.

The invention discloses a preparation method of anti-cracking impregnated bond paper and application of the anti-cracking impregnated bond paper in a core-board. The preparation method comprises the following steps: adding water and a formaldehyde solution into a reaction kettle, adding melamine while stirring, adjusting the pH value to an alkaline range, heating for polycondensation to reach the standard, cooling, and adding a water-soluble mixture to obtain anti-cracking impregnated bond; and after the pre-impregnated gummed paper is impregnated with the anti-cracking impregnating adhesive twice and is subjected to segmented drying, the surface layer is coated with a glue solution containing a curing agent and a release agent in a rolling manner, and the anti-cracking impregnated paper is obtained after drying. Aiming at the problems that the impregnated decorative paper for artificial board decoration is easy to break, the storage life of the impregnating adhesive is short, the veneer artificial board is easy to crack and the like, the toughening type melamine formaldehyde resin is prepared by adopting a compounding technology and is applied to melamine paper and the veneer artificial board, and the method is simple and easy to implement.

The invention relates to the technical field of functional coatings, and particularly discloses a preparation method of a low-temperature self-repairing water-based coating. The method comprises the following steps: preparing a repairing microcapsule which takes dehydrated castor oil as a capsule core and gelatin and Arabic gum as wall materials; preparing a heating microcapsule which takes the composite phase change material as a capsule core and urea resin or melamino-formaldehyde resin as a wall material; and mixing the two microcapsules with a water-based resin emulsion, an auxiliary agent and water according to a specific ratio to prepare the coating. When the coating is damaged at low temperature, the heating microcapsules are broken to release phase change latent heat, the low-temperature fluidity of the repairing agent is remarkably improved, activation energy is provided for curing reaction, the heating microcapsules and a catalyst in the repairing microcapsules cooperatively drive rapid curing, and the problems that in the low-temperature environment, the fluidity of the repairing agent is poor, and the curing reaction is difficult to start are effectively solved. Meanwhile, the microcapsule wall material effectively isolates active substances, so that the coating keeps good storage stability while having excellent low-temperature self-repairing capability.

The invention discloses a flame-retardant exposed liquid coiled material and a preparation method and application thereof, and belongs to the technical field of liquid coiled materials, ZIF-8 grows on ammonium polyphosphate in situ, anchoring is achieved through the ion exchange effect of zinc ions and NH4 < + > in an ammonium polyphosphate molecular chain, then coordination reaction with 2-methylimidazole is carried out, and the flame-retardant exposed liquid coiled material is obtained. Ammonium polyphosphate is added into ZIF-8 to form molecular-level coating of the ZIF-8 on the ammonium polyphosphate, so that the hydrophilicity of the ammonium polyphosphate is reduced, the precipitation risk in a humid and hot environment is reduced, the compatibility of the ammonium polyphosphate and a polymer matrix is improved, agglomeration is avoided, the ammonium polyphosphate and a charring agent melamine-formaldehyde resin form a synergistic flame-retardant system, and through the phosphorus-nitrogen synergistic effect, the flame-retardant property of the ammonium polyphosphate is improved. The flame retardant can be used for promoting the formation of a compact expanded carbon layer during combustion, so that the dual effects of gas-phase flame retardance and condensed-phase flame retardance are realized, the problem that the flame-retardant structure of a traditional product is damaged due to a humid and hot environment is effectively solved, and the flame-retardant grade and the long-term effect are remarkably improved.

This invention discloses a method for preparing superhydrophobic aerogels under ambient pressure based on framework regulation and its application. The invention involves a multi-component composite of carboxymethyl cellulose, aramid fiber, carboxylated nitrile rubber, melamine-formaldehyde resin, modified montmorillonite, hydrophobic silica, and an organosilicon waterproofing agent. A vertical pore template is constructed through directional freezing, followed by gradient solvent displacement and ambient pressure drying to finally solidify the superhydrophobic-superoleophilic aerogel. This invention successfully overcomes the core challenge of structural collapse caused by capillary forces during ambient pressure drying through the synergistic enhancement of the organic-inorganic hybrid framework and surface energy regulation, achieving a balance between low shrinkage, high porosity, and stable superwetting properties. The aerogel of this invention possesses excellent mechanical strength and elasticity, and its functionality can be expanded by introducing photothermal fillers. The process equipment is simple and energy-efficient, providing an economical and feasible technical path for the large-scale preparation of high-performance superhydrophobic aerogels.

The application discloses a heavy metal chelating agent and a preparation method thereof. The heavy metal chelating agent is obtained by controlling the synthesis of melamine formaldehyde resin prepolymer and introducing a dithiocarbamate salt group with a chelating function into the structure of the melamine formaldehyde resin prepolymer. The heavy metal chelating agent has the characteristics of high efficiency and stability, high heavy metal removal rate, fast settling speed of chelation products, low leaching, and low cost, and is suitable for industrialized treatment of heavy metal pollution in fly ash and industrial wastewater.

The invention relates to solvent-borne one-pack clearcoat material, characterized in that it comprises i.) one or more hydroxy functional polymers (A), at least one of which is a poly(meth)acrylate (A1), possessing a) a glass transition temperature below -15 °C as determined by differential scanning calorimetry; b) a hydroxyl value in the range from 130 mg KOH / g to 300 mg KOH / g; and c) a weight-average molecular weight determined by gel permeation chromatography using a polystyrene standard; ii.) one or more crosslinking agents (B), at least one of which is a melamine-formaldehyde resin possessing methoxymethyl groups (B1); and iii.) a catalyst system (C) comprising one or more amine-blocked sulfonic acids (C1); and one or more phosphoric acid catalysts (C2). The invention further related to a multilayer coating system comprising a clearcoat layer formed from said clearcoat material, a method of preparing such multilayer coating system and a thus coated substrate, as well as the use of the solvent-borne one-pack clearcoat material for coating uncoated or precoated substrates, preferably vehicle bodies or parts thereof in OEM or repair coating.

The application belongs to the technical field of bamboo processing, and particularly relates to a preparation method of improved reconstituted bamboo, wherein the defibrated bamboo bundle is stepwise impregnated by preparing etherified melamine formaldehyde resin and modified phenolic resin. First, the bamboo bundle is impregnated by the etherified melamine formaldehyde resin with small molecular size, low viscosity and good water solubility, so that the etherified melamine formaldehyde resin can deeply enter the cell wall and the inner part of the micropore of the bamboo, fully fill the pores and block the hydrophilic channels, and meanwhile, the mildewproof agent is uniformly delivered to the inner part of the bamboo. Further, the bamboo bundle is impregnated by the phenolic resin with large molecular size and modified by flexible sugar ring units, so that the phenolic resin can be enriched on the surface of the bamboo bundle and the bonding interface, a flexible bonding layer is formed, the flexible molecular chain can buffer the residual stress of the interface, the bonding layer flexibility and the bonding strength of the bamboo bundle are improved, and the structural stability of the reconstituted bamboo during long-term use is further ensured.

This application relates to the field of adhesives, and more specifically, to a UV hydrolyzable adhesive and its preparation method. It comprises the following raw materials by weight percentage: 40-58% modified polyurethane acrylate, 10-20% tackifier and absorbent polymer, 1-3% photoinitiator, and the balance being an active diluent; the tackifier and absorbent polymer is composed of a polyurethane associative thickener, methanol-etherified melamine-formaldehyde resin, absorbent fibers, and hydroxyl acrylate. By specifically selecting the polyurethane associative thickener, methanol-etherified melamine-formaldehyde resin, absorbent fibers, and hydroxyl acrylate as the main components of the tackifier and absorbent polymer, and optimizing their ratio, the adhesion strength and hydrolysis detachment effect of the UV hydrolyzable adhesive on the surfaces of lightweight composite materials such as carbon fiber composites and glass fiber reinforced plastics are significantly improved.

The present application relates to the technical field of molding compound preparation, specifically disclosing a melamine-formaldehyde molding compound and a preparation method thereof. A melamine-formaldehyde molding compound comprises the following components in weight percentage: 40-60% modified melamine-formaldehyde resin; 10-20% inorganic fiber; 20-40% filler; and 1-2% curing agent. The modified melamine-formaldehyde resin is prepared by the following method: mixing 4,4-diphenylmethane diisocyanate with aminopolyethylene glycol hydroxy to obtain a mixture A; mixing cellulose with mixture A, allowing the mixture to react at a temperature of 100°C to obtain a mixture B; cooling the mixture, adding the mixture to anhydrous ethanol, and precipitating the mixture to obtain an aminopolyethylene glycol hydroxy-cellulose graft copolymer; adjusting the pH of the formaldehyde to alkaline, adding melamine and the aminopolyethylene glycol hydroxy-cellulose graft copolymer, heating the mixture to react, and vacuum dehydrating the mixture to obtain the modified melamine-formaldehyde resin.

The invention discloses anti-corrosion marine concrete and a preparation method thereof, and relates to the technical field of marine concrete. Comprising the following raw materials in parts by weight: 270 to 290 parts of low-alkali ordinary Portland cement, 130 to 150 parts of slag powder, 110 to 130 parts of fly ash, 50 to 70 parts of high-density silica fume, 1100 to 1200 parts of aggregate, 110 to 125 parts of copper-plated microfilament steel fiber, 16 to 20 parts of ion shielding type silane grafted modified emulsion, 3 to 6 parts of melamine-formaldehyde resin coated calcium nitrite microcapsule, 0.05 to 0.1 part of modified cellulose ether and 6 to 8 parts of polycarboxylic acid high-performance water reducing agent. The water-binder ratio of the anticorrosive marine concrete is controlled to be 0.26-0.30. By constructing an organic and inorganic chemical bonding system and rheology regulation and control, uniform dispersion and stable film formation of the emulsion are realized, the interface bonding force is improved, the gradient vibration process is matched, the distribution of functional components is locked, layering and damage are avoided, and the concrete is endowed with excellent mechanical properties and self-repairing capability.

The invention provides a high-temperature-resistant slow-release fragrant curtain and a preparation method thereof. The preparation method comprises the following steps: (1) fixing fragrance essential oil in pore channels of mesoporous silica through capillary acting force to obtain composite powder; (2) placing the composite powder in a molten phase change material, and adding an emulsifier and water to form a stable emulsion; (3) dropwise adding a melamine-formaldehyde resin prepolymer solution into the emulsion, and carrying out condensation polymerization on a water-oil interface to form a shell-core type sustained-release capsule; and (4) immersing the fabric subjected to surface treatment into a water-based working solution containing shell-core type slow-release capsules and a water-based adhesive, drying and curing to obtain the high-temperature-resistant slow-release fragrant curtain. Curtain fragrance molecules obtained through the preparation method need to be sequentially taken out from mesoporous channels, penetrate through the fused or solid PCM, then diffuse to penetrate through the polymer wall material and finally released into the environment, the curtain fragrance molecules are not sensitive to temperature changes, fragrance release is slow, and the fragrance release period is prolonged.