313 results about "Melamine formaldehyde resin" patented technology

The invention belongs to the technical field of asphalt pavement repairing materials, and particularly relates to a micro-crack self-repairing microcapsule as well as a preparation method and application thereof. The microcapsule comprises a capsule wall and a capsule core, the capsule wall is prepared from methylated melamine-formaldehyde resin and a modifier, and the modifier is selected from nano carbon powder. The microcapsule has excellent wave-absorbing and temperature-rising performance, has relatively good thermal stability and mechanical properties, and can efficiently repair pavement microcracks.

The invention relates to the technical field of organic materials, and discloses an organic long-afterglow material as well as a preparation method and application thereof. The compounds (I)-VI are rigid aromatic organic compounds containing heteroatoms O, S or N, can be applied to organic long-afterglow materials and serve as guest components of the long-afterglow materials. When a substance containing melamino-formaldehyde resin is used as a main component of the organic long-afterglow material, a cross-linked structure of the organic long-afterglow material can effectively prevent a phosphorescence quenching behavior of water and oxygen on guest molecules; the organic long-afterglow material is long in afterglow luminescence life, good in long-afterglow performance stability, high in phosphorescence quantum yield and high in luminescence efficiency; the polymer film prepared by taking the organic long afterglow material as the raw material can be excited by ultraviolet in sunlight, can generate response under extremely low ultraviolet intensity, and has ultraviolet detection potential.

The invention relates to the field of temperature-adjusting fibers, and particularly discloses a preparation method of a phase-change temperature-adjusting fiber. The phase-change temperature-adjusting fiber is of a core-shell composite structure, a core layer is a lyocell fiber with wood pulp as a raw material, phase-change microcapsules are arranged on the fiber, octadecane serves as a phase-change material, and the phase-change microcapsules are formed by wrapping melamine-formaldehyde resin formed by condensation of melamine and formaldehyde. The outer layer is a shell fiber which is formed by blending polyacrylonitrile and cellulose acetate, the surface of the shell fiber contains structures such as pores, micropores and cracks, and nano titanium dioxide particles capable of absorbing ultraviolet rays are attached to the shell fiber. Experiments prove that the phase-change temperature-regulating fiber not only has a phase-change temperature-regulating function, but also has the effects of ultraviolet resistance, moisture permeability and sweat releasing. The phase-change temperature-adjusting fiber is used as a raw material, and is blended and woven with other fibers to prepare the temperature-adjusting functional fabric.

The present invention belongs to the technical field of composite materials, and specifically relates to a high-strength, durably flame retardant, seawater corrosion-resistant plastic-wood composite material, and a preparation method. The plastic-wood composite material of the present invention is primarily made of modified wood powder, a melamine formaldehyde resin, polyvinyl chloride and a binary hydroxyl-modified vinyl resin. The modified wood powder used in the present invention first undergoes a modification reaction using a melamine and formaldehyde solution on the surface of the wood powder under the catalytic action of citric acid, and is then dried. The modified wood powder enhances compatibility with the melamine formaldehyde resin. When preparing the plastic-wood composite material of the present invention, during a molding process, polyvinyl chloride partially self-crosslinks to form crosslinked polyvinyl chloride, causing the final product to have excellent static bending strength and tensile strength, and have durable flame retardancy. The flame retardancy performance does not significantly decrease after boiling in simulated seawater for 172 hours, and there is no obvious change on the surface. It is suitable for boardwalks in seaside scenic spots, etc.

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 invention relates to an ultra-low VOC baking type quick-drying coating and a preparation method thereof, and belongs to the technical field of coatings. The coating is prepared from the following components: composite hybrid resin, methylated melamine formaldehyde resin, neopentyl glycol diglycidyl ether, trimethylolpropane triacrylate, composite filler, zinc fatty acid, fumed silica, a silane coupling agent KH-560, aminoethyl aminopropyl polydimethylsiloxane and the like. The composite hybrid resin is prepared by adopting a special method; the composite hybrid resin is matched with methylated melamine formaldehyde resin, neopentyl glycol diglycidyl ether, trimethylolpropane triacrylate, a composite filler, zinc fatty acid, fumed silica, a silane coupling agent KH-560, aminoethyl aminopropyl polydimethylsiloxane and other components according to a certain proportion for use, and has the advantages of low VOC emission, quick drying during baking, high heat resistance, high heat resistance, high heat resistance, high heat resistance, high heat resistance, high heat resistance and the like. Meanwhile, the adhesive force is good, the hardness and the flexibility are balanced, and the chemical resistance is excellent.

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 belongs to the technical field of carbon materials and new energy materials, and particularly relates to a modified resin-based nitrogen-containing hard carbon material as well as a preparation method and application thereof. Melamine is introduced into a phenolic resin system to synthesize phenol-melamine-formaldehyde resin, triazacyclo-covalently polymerized resin molecules are formed, an organic pore-forming agent is synchronously used for adjusting the pore channel structure of the material, and after high-temperature carbonization, the high-temperature carbonization is performed to obtain the high-temperature-resistant phenolic resin. And the hard carbon negative electrode material for the sodium ion battery, which is high in nitrogen doping, rich in closed pore structure and disordered in microstructure, is prepared. After melamine participates in the reaction, a triazacyclo ring with a stable structure is introduced into a resin molecular structure, and the nitrogen-doped hard carbon material is formed after carbonization. Nitrogen elements are uniformly distributed in the carbon material and on the surface of the carbon material, abundant active sites are provided, and the reversible capacity of sodium ion storage can be improved.

The invention discloses self-repairing UHPC (Ultra High Performance Concrete). The self-repairing UHPC comprises a UHPC matrix, magnetic induction microcapsules and a hydrophilic modified heat-shrinkable fiber net, wherein the magnetic induction microcapsules and the hydrophilic modified heat-shrinkable fiber net are distributed in the UHPC matrix; wherein the magnetic induction self-repairing microcapsule comprises a core material and a wall material, the core material adopts isophorone diisocyanate, and the wall material comprises melamine formaldehyde resin and a rubidium magnet; the hydrophilic modified thermal shrinkage fiber net is a woven net formed by hydrophilic modified polypropylene fibers and hydrophilic modified nylon fibers. The hydrophilic modified heat-shrinkable fiber net and the electromagnetic induction self-repairing microcapsule are simultaneously introduced into a UHPC concrete matrix, a synergistic effect is exerted to repair cracks, the overall performance of the concrete can be effectively improved, the toughness, crack resistance, impact resistance and the like of the obtained concrete are remarkably improved, and the service life of the concrete is prolonged. And meanwhile, on-demand release of the repairing material in the self-repairing microcapsule can be realized, the utilization efficiency of the repairing agent is improved, and the applicability is wide.

The invention relates to an oxygen reduction catalyst and a preparation method thereof, and relates to the technical field of oxygen reduction catalysts. The preparation method comprises the following steps: 1, obtaining melamine-formaldehyde resin microspheres, dispersing the melamine-formaldehyde resin microspheres in water, adding a pyrrole solution and an iron salt aqueous solution, carrying out a stirring reaction, and carrying out centrifugal washing and drying to obtain a catalyst precursor with a core-shell structure; 2, mixing the catalyst precursor with a first pyrolyzable nitrogen-containing organic matter, and calcining in nitrogen-doped inert gas flow to obtain an oxygen reduction catalyst; the nitrogen-doped inert gas is doped with a nitrogen-containing component, and the average content of the nitrogen element in the nitrogen-doped inert gas ranges from 50 mg / L to 1500 mg / L. The preparation method of the oxygen reduction catalyst can improve the performance of the oxygen reduction catalyst.

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 discloses a hyperbranched polyamide modifier, modified melamino-formaldehyde resin and application, and belongs to the technical field of modification of melamino-formaldehyde resin. The modifier is prepared from tetraethylenepentamine, ethylenediaminetetraacetic acid, a catalyst and water; the molar ratio of the tetraethylenepentamine to the ethylenediaminetetraacetic acid is 1: (0.3-1); the dosage of the catalyst is 0.5-1.5 wt% of the total mass of the tetraethylenepentamine and the ethylenediaminetetraacetic acid. The hyperbranched polyamide modifier prepared by the invention can be blended and compatible with melamine formaldehyde resin, the toughness is improved, and the formaldehyde release is properly reduced.

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 present invention relates to a slow-release antibacterial impregnated adhesive, adhesive film paper, decorative panel and a preparation method thereof. A mixed material of melamine formaldehyde resin and Ag-MOF@CNF is used as an impregnated adhesive, and the impregnated adhesive is impregnated on paper impregnated with urea-formaldehyde glue to obtain a slow-release antibacterial impregnated adhesive film paper; the impregnated adhesive film paper and plywood or blockboard are hot-pressed to obtain an impregnated adhesive film paper decorative panel. The obtained impregnated adhesive film paper or decorative panel has excellent antibacterial performance, can reach the grade I strong antibacterial grade standard, and has good durability and has no effect on the surface performance of paper / decorative panel.

The utility model discloses a system for continuously producing methylated melamino-formaldehyde resin, which comprises a raw material storage tank A and a raw material storage tank B. The raw material storage tank A is connected with a micro-channel reactor A. A discharge port of the micro-channel reactor A is connected with a precooling pipe. A discharge port of the pre-cooling pipe and a discharge port of the raw material storage tank B are respectively connected with the micro-channel reactor B, and a discharge port of the micro-channel reactor B is connected with the receiving storage tank. According to the utility model, the reaction is continuously carried out in the micro-channel reactor, the raw material can be a high-solid-content raw material, the energy consumption and the raw material consumption are low, the quality difference of products among batches is small, and the production cost is reduced.

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.

The invention relates to the technical field of polyolefin copolymers, in particular to a high-hardness high-internal-density polyethylene propylene butylene copolymer and a preparation method thereof. The problems of low hardness and insufficient cohesion of the copolymer in the prior art are solved. The preparation method comprises the following steps: preparing an alkenyl-terminated dimethyl polysiloxane modified propylene matrix to obtain modified polypropylene; carrying out copolymerization on the modified nano calcium carbonate, 1-butene and 2-butene to obtain modified polybutene; the preparation method comprises the following steps: modifying acrylic acid and acrylamide to obtain modified polyethylene, mixing the components according to a specific ratio, carrying out polymerization reaction under the action of a composite initiator, adding melamine formaldehyde resin for crosslinking, and carrying out extrusion molding and heat treatment to obtain the copolymer. Ethylene, propylene and butylene monomers are modified, and siloxane and nano calcium carbonate are added, so that the cohesive energy of the copolymer is improved; and a three-dimensional cross-linked network is constructed by utilizing the synergistic effect of all the modified components, so that the hardness of the copolymer is improved.

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.