120 results about "Melamine resin" patented technology

The invention belongs to the technical field of flame retardants, and particularly relates to a melamine hydrobromide flame retardant and a preparation method thereof. The flame retardant disclosed by the invention has a core-shell structure, the core is hydroxylated melamine hydrobromide subjected to surface modification by a silane coupling agent, and the shell is melamine resin synergistically enhanced by ammonium polyphosphate and oxidized cellulose nanofibrils; through silanization treatment, core-shell interface combination is enhanced, and space-time synergy of gas phase and condensed phase flame retardance is achieved through a composite shell; the obtained flame retardant is high in thermal stability in a polymer matrix, the limit oxygen index of a composite material can be remarkably increased after the flame retardant is added, and the flame retardant has a wide application prospect in the field of flame retardance of high polymer materials through a UL-94 V-0 grade test.

The application discloses a kind of high heat-conducting high endurance low-temperature phase change microcapsule preparation methods, comprising: step 1: using C7, C9 alkane preparation cryogenic phase change material emulsion;Step 2: using melamine resin prepolymer containing polyethylene glycol and hydrophobic silicon carbide powder containing nano silicon carbide preparation modified wall material prepolymer;Step 3: using cryogenic phase change material emulsion and modified wall material prepolymer preparation phase change microcapsule;Step 4: using silver mirror reaction to phase change microcapsule surface silver plating, obtain surface silver plating microcapsule.The low-temperature phase change microcapsule prepared, using C7, C9 low-temperature mixed alkane as microcapsule core material;Using melamine resin as microcapsule wall material, and wall material contains polyethylene glycol modified material, nano silicon carbide modified material to improve the toughness of microcapsule, thermal conductivity;Microcapsule surface silver plating to resist volatility, eliminate residual formaldehyde in wall material.The application solves the problem of low thermal conductivity and poor durability of cryogenic phase change material microcapsule.

The invention discloses a sound chamber module system which is provided with walls on four sides and comprises a door to create an internal space, a main body frame arranged on one side of the wall, a video device arranged in the center of the main body frame and a plurality of audio devices arranged on two sides of the periphery of the video device, and the wall comprises a concrete layer. The sound absorption material layer is installed on the concrete layer, and the sponge component is doped with ferrite components. The sound absorption material layer comprises a semi-non-combustible sheet layer in which water and melamine resin powder are dissolved.

The invention provides a melamine resin powder toughening granulation method and granulation equipment thereof, and relates to the technical field of thermosetting resin.The melamine resin powder toughening granulation method comprises the following preparation processes that firstly, thermoplastic resin powder is added into a solvent to prepare a thermoplastic resin solution; 2, wrapping inorganic rigid particles with a thermoplastic resin solution to obtain a mixture; 3, the mixture is subjected to spray drying and ground into superfine powder, and then the superfine powder is mixed with melamine powder to obtain composite particles; step 4, adding carboxymethyl cellulose and zinc stearate into the composite particle material, and carrying out double-roller pressing by virtue of a pelletizer, so as to obtain a flaky material; step 5, crushing and granulating the flaky material to obtain granules; sixthly, screening the particles through a screen to obtain finished particles; and 7, re-granulating the unqualified material until qualified uniform melamine resin particles are obtained. Through the technical improvement of the three steps of wrapping, spray drying and grinding, on the basis that the toughness and the flowability of the obtained granules are improved, the uniformity of products formed by compression molding is good.

sound insulation insert (10), which is designed in particular for the interior noise reduction of a residential ventilation system that can be installed in a wall opening and has at least one axial fan having a central motor hub, wherein the sound-insulating insert (10) is made essentially of an acoustically absorbing material at least on its surfaces in contact with the airflow, and wherein the sound-insulating insert (10) has an annular outer element (12) for insertion into a wall penetration duct, wherein the sound-insulating insert (10) has an inner element (14) in an area which, in the mounted position, adjoins the motor hub of the at least one axial fan in the residential ventilation system, which is connected to the outer element (12) via at least one web (16a-c), so that an annular gap-shaped passage for the airflow is formed between the outer and inner elements, which passes through the at least one The bridge (16a-c) is divided into sections (18a-c), characterized by the fact that the outer element (12), which includes at least one web (16a-c) and the inner element (14) are made of an acoustically absorbing rigid or soft foam material, in particular a melamine resin foam.

This invention discloses a two-step method for preparing nitrogen-doped three-dimensional network phenolic resin-based composite carbon materials and their applications. The method uses an alkaline environment provided by ammonia to induce addition condensation polymerization of phenol and formaldehyde to obtain a preliminary nitrogen-doped phenolic resin. This resin is then mixed with melamine resin to achieve a second step of nitrogen introduction, and after being composited with sodium alginate, it is cross-linked with CaCl2 to obtain a three-dimensional hydrogel precursor. After carbonization and activation treatment, a nitrogen-doped porous carbon material is obtained. This material possesses both micro- and mesoporous synergy and multiple types of nitrogen functional sites, exhibiting high specific surface area capacitance and excellent cycling stability in supercapacitors. Compared with existing schemes that only use NaOH without introducing dual-source nitrogen doping (such as CN119724955A), this invention achieves synergistic optimization of structure, chemical sites, and transport through ammonia pre-doping, secondary nitrogen doping with melamine resin, and a ternary interpenetrating network. The process is simple, uses inexpensive raw materials, and is suitable for large-scale production.

The invention relates to the technical field of coatings, in particular to a thin coating type low-gloss metal floor drain protective coating with good acid and alkali resistance and a preparation method of the thin coating type low-gloss metal floor drain protective coating. Functional matting resin, high-acid-value acrylic resin, melamine resin and epoxy resin are innovatively compounded to construct an extremely compact multiple cross-linked network, a special adhesion promoter and an anti-corrosion additive are supplemented to enhance interface protection, and a solvent and a process are optimized, so that the corrosion resistance of the coating is improved, and the corrosion resistance of the coating is improved. According to the invention, all the components play a supernormal synergistic effect in a coating with the thickness of 8-10 microns, so that organic unification of three key performances of thin coating, low gloss and high acid and alkali corrosion resistance is finally realized, and the technical problems that a metal floor drain is easy to corrode and poor in appearance under the thin coating condition are effectively solved.

The application provides a microcapsule and kaolin composite reinforced self-lubricating fabric gasket material and application thereof, and relates to the technical field of lubricating materials.The application provides a tung oil-methyl etherified melamine resin microcapsule, which comprises tung oil and methyl etherified melamine resin wrapped on the surface of the tung oil, and the methyl etherified melamine resin is formed by cross-linking polymerization of methyl etherified hexamethylol melamine.The tung oil is wrapped by the methyl etherified melamine resin, so that the excellent lubricating performance of the tung oil is retained, the dispersion problem of the tung oil in the resin is solved, and the oxidation reaction of the tung oil is inhibited.The tung oil-methyl etherified melamine resin microcapsule and amino kaolin are simultaneously introduced into the self-lubricating fabric gasket material, and the synergistic reinforcing effect of the tung oil-methyl etherified melamine resin microcapsule and the amino kaolin is exerted, so that the wear resistance and the lubricating performance of the self-lubricating fabric gasket material are effectively improved.

This invention discloses a high-barrier polyvinyl alcohol coated film and its preparation method. The coated film structure sequentially includes: a film substrate, a primer layer, and a high-barrier coating layer. The high-barrier coating layer is prepared and coated from the following raw materials in the indicated mass percentages: 4-10% water-resistant modified polyvinyl alcohol, 2-6% acidic aluminum sol, 0.2-0.5% melamine resin prepolymer, 0.5-1% stabilizer, 0.05-0.5% leveling agent, 0.05-0.1% defoamer, and 83-93% deionized water. This invention provides the market with a packaging film material suitable for boiling, possessing high oxygen barrier properties and transparency.

The utility model discloses a kind of moisture-proof composite corrugated paperboard, it is related to corrugated paperboard field, specifically a kind of moisture-proof composite corrugated paperboard, including bottom layer moisture-proof layer, inner layer corrugated core layer, intermediate barrier layer, outer layer corrugated core layer and surface layer moisture-proof layer from inside to outside are sequentially arranged;The bottom layer moisture-proof layer is PET film kraft paper, the surface layer moisture-proof layer is PE film kraft paper, the intermediate barrier layer is aluminum foil composite paper, the inner layer corrugated core layer is melamine resin modified corrugated paper, the utility model solves the current corrugated paperboard surface using coating single waterproof coating or using single layer plastic film film coating, the moisture-proof effect of this single coating processing mode is limited, and easily failure due to abrasion;Although single layer film can block part liquid water, it is difficult to solve water vapor penetration problem, and interlayer is mostly starch adhesive, swelling peeling after meeting water, cannot satisfy the long-term use demand of high humidity environment problem.

The application discloses a high-hardness cover bottom dian ink, which is used for coating on a substrate and curing, and raw materials of the high-hardness cover bottom dian ink include liquid polyester resin, solid polyester resin, bisphenol A type epoxy resin, etherified melamine resin, diluent, defoaming agent, leveling agent, filler, blocked aliphatic isocyanate, matting powder, coupling agent and organic tin catalyst; and a curing process of the ink comprises the following steps: coating the ink on the substrate, heating at a speed of 5-10 DEG C / min to 130-140 DEG C, and keeping the temperature for 10-12 min; heating at a speed of 5-10 DEG C / min to 175-185 DEG C and keeping the temperature for 10-12 min, and completing the curing. After the ink is cured, an island structure is formed, the etherified melamine resin and hydroxyl group are rapidly crosslinked to form a continuous three-dimensional rigid network, and the uniformly distributed polyurethane dispersed phase in the three-dimensional rigid network can prevent cracks from expanding in the rigid network, so that the burst edge phenomenon in the mesh test is avoided.

To provide a coating agent, a cured product and a laminate, in which the cured product exhibits good appearance.SOLUTION: A coating agent comprising methylated melamine resins, C4 to 8 aliphatic polyols and water.SELECTED DRAWING: None

The invention belongs to the field of mineral processing, and discloses application of an organic inhibitor applicable under neutral to alkaline conditions in a spodumene ore flotation process, and the organic inhibitor comprises at least one of a polycarboxylic acid high-performance water reducing agent, a sulfamate high-efficiency water reducing agent, a melamine resin high-efficiency water reducing agent and a ketoaldehyde condensate high-efficiency water reducing agent. The invention further discloses a flotation process of spodumene ore. The invention finds and verifies that at least one of PCE, ASF, SMF and SAF can be used as an efficient spodumene flotation organic inhibitor for the first time and belongs to a macromolecular organic inhibitor, and the macromolecular organic inhibitor has differentiated competitive adsorption capacity on the surfaces of spodumene and gangue minerals (feldspar and quartz); the method has the double advantages of enhanced separation in a high-alkali system and efficient flotation in a neutral system. A brand-new and non-traditional inhibitor selection is provided for separation of spodumene and gangue minerals, and the technical limitation of dependence on traditional inhibitors such as sodium carbonate for a long time is broken through.

[Problem] To provide a coating agent, a cured product, and a laminate. [Technical means] A coating agent comprising a methylated melamine resin, a C4-8 aliphatic polyol, and water.

A melamine utensil made from melamine composite material and a method of manufacturing the same are provided. Stir and mix 60-70 weight percentage (wt %) of a primary powder-like melamine material, 20-30 wt % of shards of a secondary melamine material, and 5-15 wt % of melamine resin glazing powder, or 49-59 wt % of the primary powder-like melamine material, 16-26 wt % of shards of the secondary melamine material, 12-22 wt % of pulp, and 6-10 wt % of the melamine resin glazing powder evenly to form a composite material. The composite material is pre-heated and mounted into a mold to produce the melamine utensil by hot pressing. The shards of the secondary melamine material with different shapes, sizes or colors are formed by crushing of the hot-pressed secondary melamine material. During the hot-pressing, the primary melamine material and the melamine resin glazing powder are melted and attached to the secondary melamine material.

The present disclosure provides a water-based paint composition which is a single-component, has excellent storage stability, and forms a coating film having excellent workability, crack resistance, and damage resistance. The water-based paint composition of the present disclosure contains a coating film-forming resin (A), a crosslinking agent (B), a sulfonic acid compound (C), and an amine compound (D), the coating film-forming resin (A) contains an acrylic resin (A1), the hydroxyl value of the coating film-forming resin (A) is 5 mgKOH / g or more and 35 mgKOH / g or less, the crosslinking agent (B) contains a peralkyl melamine resin (B1), and the neutralization rate of the acid group of the sulfonic acid compound (C) based on the amine compound (D) is 100% or more and 1,300% or less.

The invention relates to the technical field of building insulation boards, and particularly discloses an intelligent temperature-adjusting, insulation and decoration integrated board and a preparation method thereof. An intelligent temperature adjusting, heat preservation and decoration integrated plate sequentially comprises a thermochromic protective coating, a glass fiber reinforced cement decoration panel, a phase change microcapsule / polyurethane composite heat preservation core layer, an aluminum foil reflecting layer and a gypsum-based structural layer from the outdoor side to the indoor side. The phase-change microcapsule / polyurethane composite heat-preservation core layer is prepared by the following steps: uniformly mixing phase-change microcapsules with a polyurethane white material component A, then mixing with a polyurethane black material component B, pouring and foaming, and curing after foaming to obtain the phase-change microcapsule / polyurethane composite heat-preservation core layer; the core material of the phase change microcapsule is pentacosane, and the wall material is melamine resin. The intelligent temperature adjustment, heat preservation and decoration integrated plate can integrate multiple functions of efficient heat preservation, intelligent temperature adjustment, visual heat management indication and decoration.

The invention relates to the technical field of building materials, in particular to a low-creep anti-cracking sound insulation building material and a preparation method thereof. The low-creep anti-cracking sound insulation building material is prepared from 100 parts of epoxy resin, 30-50 parts of melamine resin, 10-20 parts of a polyamide curing agent, 5-15 parts of hollow glass beads, 3-8 parts of an additive A, 2-6 parts of an additive B and 0.5-2 parts of polyether modified polysiloxane, the raw materials of the additive A comprise betel nut shells, potassium hydroxide powder and powder; the additive B is prepared from the following raw materials: shellac resin, lipase, a phosphate buffer solution, basalt fibers and nano silicon dioxide. According to the invention, the additive A takes biochar as a skeleton, multilevel channels of the biochar can anchor polymer chain segments and limit slippage and rearrangement of molecular chains, so that the creep behavior of the material is inhibited, and the additive B forms a three-dimensional enhanced network at an interface through a biological and inorganic hybrid enhancement mechanism, so that the crack resistance of the material is effectively improved.

The application relates to the technical field of melamine resin polymer materials, in particular to a high-heat-resistance melamine resin composite material, which comprises a first component and a second component; the first component comprises modified melamine resin prepolymer, crosslinking accelerant, curing agent and first dispersant; the modified melamine resin prepolymer is prepared by modifying melamine resin prepolymer through lignosulfonate and modified nanocellulose whisker; the modified nanocellulose whisker is prepared by modifying nanocellulose whisker through a silane coupling agent; the second component comprises composite reinforcing material; the composite reinforcing material comprises carboxylated carbon nanotube, montmorillonite-graphene hybrid, second dispersant and nucleating agent; the carboxylated carbon nanotube is prepared by reacting carbon nanotube and strong acid; and the montmorillonite-graphene hybrid is prepared by reacting montmorillonite and graphene oxide. The melamine resin is modified by lignosulfonate and modified nanocellulose whisker, and the composite reinforcing material is combined to improve the heat resistance and mechanical properties of the melamine resin by using a gradient curing process.

The invention discloses high-flame-retardant low-VOC (volatile organic compound) acrylic acid composite resin and a preparation method thereof. The method comprises the following steps: reacting a melamine resin prepolymer, ammonium polyphosphate and a charring catalyst in an acidic water phase to prepare a microencapsulated synergistic flame retardant with a core-shell structure; then pentaerythritol, phosphorus oxychloride and hydroxyethyl methylacrylate are subjected to a reaction to synthesize a reaction type phosphorus flame-retardant monomer; finally, the monomer, methyl methacrylate, butyl acrylate, acrylic acid and the microencapsulated flame retardant are subjected to emulsion copolymerization in a water phase, and target resin is prepared. Through the synergistic effect of double mechanisms of reactive flame retardance and microencapsulation synergistic flame retardance, the limit oxygen index of the resin is larger than or equal to 32%, and flame-retardant components are stable and do not migrate; a water phase system is adopted in the whole process, the VOC source is controlled from the source, and the VOC content of the product is lower than 40 g / L. The obtained resin has excellent flame retardance, environmental protection property and good mechanical property, and is suitable for the field of high-end coatings and adhesives.

The invention belongs to the technical field of electrode paste preparation, and particularly relates to an efficient and environment-friendly electrode paste production process. A composite binder and a corncob powder-lignin composite carbonized precursor are prepared, hexamethylenetetramine-melamine resin is used as a composite cross-linking agent, the rigidity and thermal stability of boron modified phenolic resin in the composite binder are enhanced through a B-O bond, a phenolic hydroxyl group of the boron modified phenolic resin and plant pitch form a hydrogen bond, and the plant pitch is subjected to heat preservation and heat preservation. A hydrogen bond-covalent bond cross-linked network is formed under the action of the cross-linking agent, so that the high-temperature structure stability is guaranteed; the corncob powder fixes lignin through a porous framework, multistage pore channels are formed after carbonization, interface gaps are filled, the lignin is pyrolyzed at a high temperature to generate a carbon nano-whisker reinforced framework, thermal stress can be dispersed, interface bonding can be enhanced, and therefore the compactness and high-temperature stability of the electrode paste are improved. In addition, the bio-based composite binder is adopted to replace traditional petroleum-based asphalt, so that the emission of harmful substances is reduced from the source, and the environmental protection benefit and the high performance of the product are both considered.

A carrier foil for transferring a coating onto a substrate covered with a melamine resin film, wherein the carrier foil comprises a foil with an upper foil surface and a lower foil surface, wherein the lower foil surface facing the substrate has a roughness Rz of 0.1 μm up to 100 μm and the upper foil surface has a roughness Rz of 0.1 μm up to 100 μm. A transfer foil and corresponding methods and laminates are also described.

Melamine resin foam comprising a hindered amine light stabilizer as heat stabilizer The present invention relates to a use of a sterically hindered amine for stabilizing a melamine resin foam against heat; and to a melamine resin foam comprising a sterically hindered amine; and to a process for producing the melamine resin foam comprising heating and foaming an aqueous mixture M using microwave radiation, said mixture M comprising at least one melamine-formaldehyde precondensate, at least one sterically hindered amine, at least one curative, at least one surfactant and at least one blowing agent; and to a use of the melamine resin foam for acoustic and / or thermal insulation.

The application relates to a porous carbon-coated cobalt sulfide nanosheet catalyst and a preparation method and application thereof, and belongs to the field of electrocatalytic materials and renewable energy technologies. The application constructs a composite nanosheet structure of Co9S8 nanoparticles embedded in a porous carbon matrix, so as to solve the problems of insufficient activity and stability of a bifunctional oxygen catalyst. The preparation method comprises the following steps: 1, preparing hexagonal alpha-Co(OH)2 nanosheets; 2, preparing a uniformly dispersed alpha-Co(OH)2 nanosheet loaded surfactant micelle template solution; 3, preparing a mesoporous melamine resin coated alpha-Co(OH)2 nanosheet composite; and 4, placing the mesoporous melamine resin coated alpha-Co(OH)2 nanosheet composite obtained in the step 3 and a sulfur source in a tube furnace respectively, and carrying out two-step high-temperature treatment under a protective atmosphere, so that the catalyst is obtained. The catalyst shows excellent bifunctional oxygen catalytic activity in an alkaline medium: the overpotential of an oxygen evolution reaction is as low as 324 mV (10 mA cm ‑2 ), and the starting potential of an oxygen reduction reaction reaches 0.92 V.

One embodiment of the present application is a thermosetting release coating agent composition, which is a thermosetting release coating agent composition containing an alkyl-etherified melamine resin (A) and an acid catalyst (B), contains an ethyl ether group as an alkyl ether group contained in the alkyl-etherified melamine resin (A), and has a weight average molecular weight of the alkyl-etherified melamine resin (A) of 500 to 1,100.

This invention belongs to the field of battery materials technology. It provides a lithium / sodium-ion battery anode material and its preparation method. Melamine and formaldehyde are used as polymerization monomers, and hydrochloric acid is used as a catalyst. Melamine resin microsphere samples are prepared in a mixed system of ethanol and water. A suitable amount of the sample is carbonized at a temperature of 650-1000℃ to form hard carbon powder. The treated hard carbon powder is then composited with a high-molecular organic material, heat-treated, and sieved to obtain the hard carbon anode material. The battery prepared using the hard carbon anode material of this invention has an initial reversible specific capacity of over 320 mAh / g and an initial coulombic efficiency of over 88%.

This invention discloses a process for preparing modified polyamine resin. The process includes: first, reacting polytetramethylene ether glycol with isophorone diisocyanate to prepare an NCO-terminated polyurethane prepolymer; then, premixing methylated melamine resin with bisphenol A type epoxy resin in a certain proportion; subsequently, adding the polyurethane prepolymer, a blocked sulfonic acid catalyst, an epoxy silane coupling agent, and a cosolvent while cooling, dispersing evenly, and curing at 100-120°C for 30-40 minutes to form an epoxy-polyurethane-amino resin interpenetrating network structure. The mass fractions of each component are: 60-80 parts of methylated melamine resin, 20-40 parts of epoxy resin, 15-25 parts of polyurethane prepolymer, 0.5-1.2 parts of catalyst, and 0.5-2 parts of coupling agent. This invention reduces the curing temperature of traditional amino resins from 150-180°C to 100-120°C, significantly reducing energy consumption and making it suitable for heat-sensitive substrates; at the same time, it greatly improves the resin's flexibility, impact resistance and adhesion, and is a single-component latent curing system with excellent storage stability.

There is provided a biocidal composition comprising: a carrier comprising a polyurethane, a polyurethane precursor, an epoxy resin, an epoxy resin precursor, a melamine resin, or any combination thereof; a copper (I) salt; and a copper auxiliary additive different from the carrier, the copper auxiliary additive comprising a phosphite, a phosphine, or a combination thereof; and wherein the biocidal composition or the film thereof exhibits an antimicrobial efficacy of at least 3 logarithm killing after storage of the biocidal composition or the film thereof at ambient temperature and ambient relative humidity for 90 days. Further provided is a biocidal additive formulation comprising a copper (I) salt and a copper auxiliary additive wherein a biocidal composition comprising the biocidal additive formulation and a carrier or a film of the biocidal composition exhibits an antimicrobial efficacy of at least 3 logarithm killing, as measured by the EPA test.

The invention relates to the technical field of composite materials, and discloses a phosphate-melamine composite coating wall material which comprises an inner phosphate coating layer and an outer melamine coating layer, the inner-layer phosphate coating layer is composed of at least one of ammonium dihydrogen phosphate and zinc phosphate, the inner-layer phosphate coating layer is combined with the surfaces of the coated particles, and the thickness of the inner-layer phosphate coating layer is 0.5-5 [mu] m; the outer melamine coating layer is a continuous compact organic film and coats the outer surface of the inner phosphate coating layer, and the thickness of the outer melamine coating layer is 1-10 microns. By designing a specific double-layer composite structure of a phosphate inner layer and a melamine outer layer, the high temperature resistance and flame retardance of an inorganic phosphate framework and the compact water resistance and high toughness of an organic melamine resin film are ingeniously combined, and the problem of functional limitation of a single wall material is successfully solved; and the wall material has excellent high temperature resistance, water resistance and impact resistance at the same time.

The invention relates to the field of functional materials technology, specifically to a preparation method, product, and application of hydrophobic melamine resin foam. The preparation method of hydrophobic melamine resin foam includes the following steps: Vacuum-impregnate the melamine resin foam with a solution of poly(dimethyl diallyl ammonium chloride). Subsequently, immerse the cationic-coated melamine resin foam in a sodium polyacrylate solution. Next, immerse the anionic-coated melamine resin foam in a titanium dioxide mixed solution for cross-linking. After cross-linking, immerse the melamine resin foam in a solution of tridecafluoro-octyl triethoxysilane. After impregnation, dry the foam to obtain hydrophobic melamine resin foam. The preparation method of the invention is simple, cost-effective, and easy to scale up for industrial applications. The hydrophobic melamine resin foam prepared using this method can achieve a hydrophobic contact angle of up to 150° and exhibits excellent oil absorption performance.