126 results about "Melamine cyanurate" patented technology

The invention relates to the technical field of insulating materials, in particular to insulating powder and a preparation method thereof. The invention discloses a flame-retardant coating which comprises the following components in parts by weight: 15-25 parts of epoxy resin, 10-20 parts of aluminum hydroxide, 5-12 parts of nano boron nitride, 1-3 parts of a silane coupling agent KH-560, 3-8 parts of polytetrafluoroethylene micro powder, 2-6 parts of fluorine-modified montmorillonite, 4-9 parts of melamine cyanurate, 2-5 parts of nano titanium dioxide, 1-4 parts of a fluorine-modified graphene oxide-polyaniline composite material and 0.5-2 parts of pentaerythritol stearate. The anti-corrosion coating is prepared from the following components in parts by weight: 1 to 3 parts of nano zinc oxide, 5 to 10 parts of glass fiber, 2 to 5 parts of polyhedral oligomeric silsesquioxane-polyimide copolymer, 1 to 4 parts of ferrocenyl epoxy resin and 0.5 to 2 parts of perfluorooctyltriethoxysilane. The insulation powder is high in corrosion resistance, excellent in insulation, heat dissipation and mechanical performance, environmentally friendly in processing, good in adaptability, capable of prolonging the service life of equipment and reducing the cost, suitable for special environments and wide in popularization prospect.

The invention relates to a composite powder explosion suppressant for suppressing aluminum hydride explosion and a preparation method of the composite powder explosion suppressant, belongs to the technical field of explosion suppressants, and solves the problems of single action mechanism, high required explosion suppression concentration, low efficiency and the like of a traditional explosion suppressant. According to the solution, the composite powder explosion suppressant for suppressing aluminum hydride explosion is prepared through raw material pretreatment, powder mixing and drying in sequence, and the composite powder explosion suppressant is prepared from the following components in parts by mass: 10.2 to 30.2 parts of melamine cyanurate, 20.4 to 40.6 parts of monopotassium phosphate, 15.2 to 25.2 parts of potassium bicarbonate, 8.4 to 13.2 parts of aluminum hydroxide, 6.8 to 11.1 parts of zinc borate, 5.0 to 9.0 parts of fumed silica and 2.0 to 5.3 parts of calcium silicate. The explosion suppressant can act on different combustion areas and combustion stages in the aluminum hydride explosion process, the physical and chemical explosion suppression effects of all the components of the explosion suppressant are fully exerted, and meanwhile, efficient explosion suppression of aluminum hydride explosion can be achieved through the synergistic effect of all the components.

The invention belongs to the technical field of polymer composite materials, and particularly relates to an efficient flame-retardant low-toxic-gas-release silicone rubber composite material and a preparation method thereof. The high-efficiency flame-retardant low-toxic-gas-release silicone rubber composite material comprises the following components in parts by weight: 100 parts of methyl vinyl silicone rubber; 10 to 20 parts of ZIF-67 modified by polysiloxane; 5-10 parts of modified nano molybdenum oxide; 5 to 10 parts of melamine cyanurate; 40 to 50 parts of mesoporous SiO2 aerogel; 1-3 parts of hydroxyl silicone oil; 0.5 to 1.5 parts of a vulcanizing agent; and 0-5 parts of an auxiliary agent. The flame-retardant and smoke-suppression performance of the silicone rubber composite material is remarkably improved through material technology innovation, and meanwhile, the mechanical property and the high temperature resistance are improved.

The invention discloses a polyester film for a blue adhesive tape, which is used for binding and packaging a battery of a new energy electric vehicle. The polyester film is prepared from 70-85 parts by weight of high-viscosity polyethylene glycol terephthalate, 5-12 parts by weight of thermoplastic polyurethane, 2-4 parts by weight of siloxane resin powder, 1-3 parts by weight of melamine cyanurate, 2-5 parts by weight of organic modified montmorillonite, 1-3 parts by weight of a coupling agent and 1-3 parts by weight of a coupling agent. 1-3 parts by weight of aromatic polyimide micro powder and 0.3-0.5 part by weight of ethylene glycol monostearate. The invention also discloses a preparation method of the polyester film. The polyester film for the blue adhesive tape is excellent in dielectric strength, flexibility, puncture resistance and flame retardance, the characteristics directly correspond to strict requirements of automobile lithium battery shell packaging, and comprehensive guarantee is provided for safety, reliability and environmental adaptability.

The invention discloses an environment-friendly halogen-free efficient flame-retardant composition, a flame retardant, a preparation method and application, and relates to the field of flame retardants, and the environment-friendly halogen-free efficient flame-retardant composition specifically comprises piperazine pyrophosphate, melamine cyanurate, organic phosphonate and polytetrafluoroethylene. The flame-retardant efficiency is improved. By introducing the silane coupling agent, the compatibility of the flame-retardant composition and polyolefin is improved, the processability of the flame retardant and a polyolefin substrate is improved, the precipitation of the flame retardant is reduced, and the flame-retardant composition can continuously and stably exist in a double-85 environment for more than 1000 hours without precipitation. The halogen-free flame retardant prepared by the method can reduce the use cost, solves the problem that most of the halogen-free flame retardants of the scorched piperidine system in the market are easy to separate out, is high in universality, and has a better flame-retardant effect in flame retardance of various types of polyolefins such as polypropylene and polyethylene.

The invention relates to the technical field of composite coating preparation materials for battery diaphragms, in particular to a composite coating for a battery diaphragm as well as a preparation method and application. The invention discloses a graphene quantum dot / carbon nanotube composite material, which is prepared from the following components in percentage by weight: 3 to 8 percent of aminated graphene oxide-polydopamine graft, 10 to 18 percent of polyimide-polyetheretherketone-nano SiO2 hybrid, 2 to 5 percent of hydroxyapatite-montmorillonite core-shell particles, 0.5 to 3 percent of zinc borate-melamine cyanurate compound, 1 to 3 percent of graphene quantum dot-carbon nanotube hybrid, 2 to 6 percent of sodium carboxymethyl cellulose and 50 to 70 percent of deionized water. 0.5 to 2 percent of barium strontium titanate nanocrystalline or 1 to 3 percent of polyethylene glycol-polypropylene glycol segmented copolymer can also be added. All the components are combined through molecular-level reaction to construct a high-performance protection network. The composite coating is good in high temperature resistance and mechanical strength, high in ionic conduction efficiency, excellent in flame retardant effect and good in interfacial compatibility, the preparation process is environmentally friendly and easy to industrialize, the composite coating is suitable for various batteries, and the comprehensive performance of the composite coating is superior to that of a traditional coating.

The invention discloses a halogen-free flame-retardant polyphenyl ether composite material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The composite material is prepared from the following components in parts by weight: 40-70 parts of polyphenyl ether resin, 10-30 parts of high impact polystyrene resin, 4-8 parts of SEBS (Styrene-Ethylene-Butylene-Styrene) resin, 5-10 parts of organic and inorganic composite flame retardant, 3-8 parts of phosphate flame retardant, 1-5 parts of polyborosiloxane and auxiliaries. The core of the organic-inorganic composite flame retardant is that the organic-inorganic composite flame retardant is a core-shell structure particle which takes magnesium-aluminum hydrotalcite and nano silicon dioxide as a core and melamine cyanurate as a shell according to a specific proportion. Through the synergistic effect of all the components, especially the core-shell structure, the dispersity and interfacial compatibility are effectively improved, so that the material achieves excellent flame retardance while maintaining high impact strength and heat resistance, and the UL-94 V-0 grade can still be met even under the condition of a 0.8 mm thin wall. The material is particularly suitable for preparing thin-wall electronic and electrical appliance shells and new energy automobile parts with harsh performance requirements.

The invention discloses a halogen-free flame-retardant nylon composite material and a preparation method thereof. The composite material comprises 61.5-90% of nylon resin, 0.2-1.5% of a phosphorus-nitrogen-silicon flame retardant, 5-20% of a silicate and beta-nucleating agent compound, 5-15% of a dynamically vulcanized elastomer, 0.1-2% of a light stabilizer and 1-3% of a nanoscale inorganic filler. The phosphorus-nitrogen-silicon flame retardant is composed of ammonium polyphosphate, melamine silicate and nano silicon dioxide, and melamine cyanurate is synthesized in situ in the twin-screw extrusion process. The preparation method comprises the steps of precise temperature control extrusion, three-zone in-situ reaction, nanofiller vacuum dehydration and NIRS real-time drying monitoring. The material has high flame retardance, excellent electrical property and mechanical strength, is suitable for electric vehicle battery shells, rail transit high-voltage connectors and aerospace interior trim parts, and meets the requirements of high safety and high reliability.

The invention discloses an adsorbent material for removing perfluorinated and polyfluoroalkyl substances in water and a preparation method thereof, and belongs to the technical field of adsorption separation. The preparation method of the adsorbent material for removing perfluorinated and polyfluorinated alkyl substances in water comprises the following five steps: preparing melamine cyanurate in-situ coated lignin, preparing a precursor, carbonizing, activating with water vapor, and performing hydrothermal secondary activation. The specific surface area of the adsorbent material for removing perfluorinated and polyfluoroalkyl substances in water is 1109-1205m < 2 > / g, the average pore size is 24.2-30.7 nm, and the saturated adsorption capacities of the adsorbent material for PFOS, PFOA and PFBA are respectively 158-183mg / g, 163-177mg / g and 161-170mg / g.

The invention discloses a low-smoke halogen-free environment-friendly flame retardant, and relates to the technical field of flame retardants. The invention discloses a low-smoke halogen-free environment-friendly flame retardant. The graphene quantum dot composite material is prepared from the following raw materials in parts by weight: 8 to 12 parts of novel phosphorus-nitrogen heterocyclic compound, 5 to 9 parts of silane-terminated polyether, 2 to 5 parts of graphene quantum dot dispersion liquid, 6 to 10 parts of pentaerythritol diphosphate melamine salt, 5 to 8 parts of melamine cyanurate, 3 to 6 parts of zinc borate, 8 to 12 parts of magnesium hydroxide, 10 to 15 parts of ammonium polyphosphate, 3 to 7 parts of modified polycarbonate and 4 to 8 parts of aluminum diethylphosphinate. The invention relates to a high-temperature-resistant anti-aging coating which is prepared from the following components in parts by weight: 2-4 parts of an organic silicon elastomer, 0.2-0.5 part of triphenyl phosphate, 0.3-0.6 part of polyethylene wax, 0.3-0.8 part of a silane coupling agent KH-550 and 25-35 parts of deionized water. The low-smoke halogen-free environment-friendly flame retardant disclosed by the invention has remarkable advantages, adopts various environment-friendly raw materials, and is green, safe and free of halogen pollution. Through the unique formula design, all the components have a synergistic effect, the flame retardant property is excellent, and the fire risk can be effectively reduced. The added graphene quantum dots and other components also improve the thermal stability and mechanical properties of the product, and the application prospect is wide.

The invention provides a high-wear-resistance halogen-free low-smoke flame-retardant polyolefin cable material and a preparation method and application thereof, and the high-wear-resistance halogen-free low-smoke flame-retardant polyolefin cable material comprises the following raw material components in parts by weight: 80-120 parts of a polyolefin base material; the composite material comprises the following components in parts by weight: 5-10 parts of a hydrogenated styrene-butadiene block copolymer (SEBS), 10-20 parts of a radiation grafting compatilizer, 1.5-3 parts of a self-made wear-resistant agent, 1-3 parts of silicone master batches and 60-80 parts of an inorganic flame retardant comprising magnesium hydroxide or / and aluminum hydroxide. The composite material is prepared from the following components in parts by weight: 3 to 5 parts of hexaphenoxy cyclotriphosphazene, 5 to 10 parts of aluminum diethylhypophosphite, 10 to 20 parts of melamine cyanurate (MCA), 3 to 6 parts of composite antioxidant and 1.0 to 2.5 parts of crosslinking sensitizer powder. 3-5 parts of a processing aid and 4-6 parts of environment-friendly orange master batch. The cable material has the advantages that the cable material is halogen-free, low-smoke and flame-retardant, the shore hardness is 85A, the tensile strength and the elongation at break retention rate after short-term aging are greater than or equal to 80%, the elongation at break after long-term aging is greater than or equal to 50% and the like, and other properties meet the T / CAS356-2019 standard requirements.

This invention discloses an MPP pipe for power cables and its preparation method, relating to the field of polymer materials technology. The invention comprises, by weight, 80-90 parts of a toughening nucleating agent; 40-45 parts of an insulating nucleating agent obtained by in-situ composite and gradient temperature imidization treatment of a polyamic acid prepolymer prepared from hexagonal boron nitride nanosheets (prepared by surface modification with dopamine hydrochloride, followed by modification with octyltriethoxysilane) to obtain a silanized boron nitride suspension; 40-45 parts of melamine cyanurate; 2.1-2.4 parts of an antioxidant; 2.6-3 parts of a light stabilizer; 8-9 parts of a lubricant; and 1340-1500 parts of polypropylene. The introduction of the toughening nucleating agent and insulating nucleating agent in this invention effectively improves the flame retardancy, low-temperature rigidity-toughness balance, and aging resistance of the MPP pipe.

The application belongs to the field of polymer composites, and particularly relates to a synergistic flame-retardant composite material for fireproof doors and a preparation method thereof; aiming at the problem that excessive addition of a flame retardant can cause the mechanical property of a composite material to decrease; the application improves the dispersibility of nano-zinc oxide in a PVC matrix through citric acid / phytic acid composite modification, and forms a high-efficiency synergistic flame-retardant system by compounding with aluminum diethyl phosphinate and melamine cyanurate; by constructing a gradient functional structure of a high-flame-retardant region and a low-flame-retardant region, and cooperating with a co-extrusion process, the damage of the flame retardant to the mechanical property of the matrix is reduced while the overall excellent flame-retardant property of the material is ensured.

The invention relates to the technical field of high-voltage cables, in particular to a crosslinked polyethylene insulated high-voltage direct-current cable, which is characterized in that an insulating layer contains a crosslinked polyethylene base material, a composite modifier, an antioxidant compound system, a nano nucleating agent, a tracking-resistant agent, a compatilizer and a smoke suppressant, the composite modifier is prepared by compounding an ethylene-vinyl acetate copolymer and a methyl methacrylate-butadiene-styrene copolymer, the antioxidant is prepared by compounding hindered phenol and phosphite ester, the nano nucleating agent is prepared from silane coupling agent KH-550 modified talcum powder and calcium carbonate, the tracking-resistant agent is prepared from melamine cyanurate and stearic acid activated magnesium hydroxide, and the lubricant is prepared from a lubricant and a lubricant. The compatilizer is maleic anhydride grafted polyethylene, and the smoke suppressant is compounded by ammonium molybdate and tin oxide. The components synergistically improve the flexibility, aging resistance and dielectric property of the insulating layer, the tracking resistance and smoke suppression are balanced, and the preparation process solves the problem of additive agglomeration, accurately controls the crosslinking degree, reduces the internal stress and improves the performance uniformity.

The invention discloses a sulfur-free FR-4 copper-clad plate and a preparation method thereof, and belongs to the technical field of copper-clad plates. The copper-clad plate is prepared from sulfur-free epoxy resin, a sulfur-free curing agent, a sulfur-free flame retardant, organic silicon hybrid macromolecules, tetrafunctional epoxy resin, linear phenolic resin, microencapsulated ammonium polyphosphate, melamine cyanurate, surface grafting modified boehmite nanorods and filler. Through the design of a sulfur-free system, the sulfur content of the product is lower than 50 ppm, and the problems of contact resistance increase, unstable signal transmission and the like caused by sulfide migration of a traditional FR-4 copper-clad plate in a high-temperature and high-humidity environment are thoroughly solved. Meanwhile, the organic silicon hybrid macromolecules and the high-functionality epoxy resin have a synergistic effect, so that the balance of high glass transition temperature and high toughness is realized. The copper-clad plate has excellent dielectric property, flame retardant property and long-term reliability, and meets the development requirements of high reliability and high performance of electronic products.

The application provides an antistatic flexible connection and a preparation method, and the antistatic flexible connection comprises a flange and a connecting piece connected with the flange, and the connecting piece is composed of a middle buffer layer and antistatic functional layers arranged on both sides of the middle buffer layer; the antistatic functional layer is composed of the following components in parts by weight: 5-10 parts of a conductive polymer, 2-5 parts of an interface modifier, 1-3 parts of a self-made antioxidant, 35-45 parts of inorganic filler modified polyurethane elastomer, 10-18 parts of functional fillers, 3-6 parts of fluorosilicone, 5-9 parts of melamine cyanurate, 8-12 parts of nano kaolin and 2-5 parts of polyethylene glycol diacrylate. Through reasonable collocation and synergistic effect of the components, the antistatic flexible connection has excellent performance in antistatic property, mechanical property, flame retardancy, aging resistance and the like, and meets the use requirements under complex working conditions.

The invention provides a high-strength collision-resistant cable and a preparation method thereof. The high-strength collision-resistant cable comprises an oxygen-free copper conductor, a modified insulating layer, a multifunctional buffer layer, a high-strength armor layer and a wear-resistant outer sheath which are sequentially arranged from inside to outside, the invention relates to a preparation method of an anti-aging agent. The high-strength collision-resistant cable is prepared from the following raw materials: 35 to 45 parts of modified crosslinked polyethylene, 12 to 18 parts of polyisobutene grafted maleic anhydride-nano boron nitride compound, 8 to 15 parts of modified high-performance polypropylene-graphene quantum dot compound, 3 to 6 parts of nano titanium dioxide, 7 to 12 parts of aramid staple fiber, 5 to 10 parts of melamine cyanurate and 0.8 to 1.5 parts of calcium stearate. 0.5 to 1.0 part of a silane coupling agent, 6 to 10 parts of polycaprolactone and 0.3 to 0.8 part of an antioxidant. The obtained cable has excellent comprehensive performance of high strength, impact resistance, insulation, flame retardance and weather resistance.

The invention discloses a flame-retardant toughening agent for a polypropylene material and a preparation method of the flame-retardant toughening agent, and relates to the technical field of flame-retardant toughening agents. The flame-retardant toughening agent for the polypropylene material is prepared from the following raw materials: a polypropylene carrier, ethylene-octylene elastomer grafted maleic anhydride, a modified polypropylene compatilizer, modified ammonium polyphosphate, pentaerythritol, melamine cyanurate, a zinc oxide-zinc borate compound synergist, polytetrafluoroethylene micro powder, nano silicon dioxide and a hindered phenol antioxidant. The composition comprises a phosphate antioxidant, oxidized polyethylene wax, calcium stearate, a nucleating agent and an ammonium molybdate smoke suppressant. According to the invention, a polypropylene carrier is taken as a matrix, ethylene-octylene elastomer grafted maleic anhydride and a modified polypropylene compatilizer are introduced synergistically to construct a plurality of raw materials such as a polar gradient interface, so that synergic improvement of flame retardance and toughening performance is realized on the premise of not significantly sacrificing flow and strength; it is expected that a stable vertical combustion rating and higher carbon layer integrity and impact resistance retention rate can be obtained.

The invention relates to the technical field of polymer composite materials, in particular to a phenolic melt-blown fabric applied to tunnel fire prevention and a preparation method of the phenolic melt-blown fabric. 5-18 parts of a space-time adaptive heterogeneous flame retardant topological agent; 10 to 25 parts of dynamic self-adaptive strain energy storage ceramic microspheres; 10 to 20 parts of ammonium polyphosphate; 5 to 10 parts of melamine cyanurate; 3-8 parts of a modified triazine charring agent; 1 to 3 parts of plasma modified two-dimensional transition metal sulfide nanosheets; 0.5 to 2 parts of fluoroalkyl silane modifier steam; 2 to 6 parts of a microencapsulated silicate ester self-repairing agent; 50 to 100 parts of deionized water; 1 to 5 parts of sodium carboxymethyl cellulose; and 1 to 5 parts of sodium polyacrylate. Intelligent flame retardance is realized through phase change and network reconstruction of the space-time adaptive heterogeneous flame retardant topological agent at high temperature, so that the material has excellent adaptive fire resistance, high mechanical strength, damage self-repairing and super-hydrophobic characteristics.

The application provides a fire-retardant immersion type cooling liquid for high-multiplicity lithium iron phosphate battery packs and a preparation method thereof, raw materials of the fire-retardant immersion type cooling liquid include, in percentage by weight, 85-95% fluorine compound base carrier, 5-15% phosphorus-nitrogen composite fire retardant; the fluorine compound base carrier contains low-boiling-point hydrofluoroether, branched-chain perfluoropolyether and h-BN nanosheet, and the fire retardant is a microencapsulated ammonium polyphosphate and melamine cyanurate compound system. The preparation is completed through carrier mixing, nanosheet composite dispersion, fire retardant compounding and vacuum degassing. The application realizes high heat dissipation, high insulation, UL94 V-0 level halogen-free fire retardancy and more than 6 months of stable performance, solves problems such as high viscosity, slow heat dissipation, poor fire retardancy, environmental protection hidden danger and insufficient stability of traditional cooling liquids, and adapts to the safety cooling demand of high-multiplicity lithium iron phosphate battery packs.

This invention discloses a heat-absorbing layer for a metal oxide varistor. A thermally protected metal oxide varistor (TMOV) device includes: an MOV chip; a first electrode disposed on a first side of the MOV chip; a second electrode disposed on a second side of the MOV chip opposite to the first side; a conductive first lead connected to the first electrode; a heat-absorbing layer bonded to the second electrode by a heat-absorbing paste formed from a mixture of silica sand, melamine cyanurate, and silicone resin, wherein the heat-absorbing paste is formed from a mixture of melamine cyanurate and silicone resin; a thermal cutoff (TCO) element extending through pores in the heat-absorbing layer and having a first end electrically connected to the second electrode by a certain amount of solder having a melting temperature lower than the melting temperature of the TCO element; and a conductive second lead electrically connected to the second end of the TCO element.

The invention belongs to the technical field of coatings, and particularly relates to a fireproof coating material for a color-coated aluminum plate strip and a preparation method thereof, the fireproof coating material comprises the following raw materials by weight: 35-40 parts of an epoxy resin base material, 25-30 parts of a composite modified flame retardant, 5-10 parts of a modified reinforcing filler, 3-6 parts of a char forming accelerator, 1-2 parts of a dispersant, 0.5-1 part of an antifoaming agent, 15-20 parts of a solvent, and 2-4 parts of a wear-resistant auxiliary agent; wherein the composite modified flame retardant is prepared by firstly modifying melamine cyanurate, then reacting with a prepolymer synthesized by diethanol amine and adipic acid, and adding ammonium polyphosphate and expandable graphite; the modified reinforcing filler is prepared by treating silicon dioxide with a silane coupling agent and then reacting with chitosan and zinc nitrate. The coating material has excellent fire resistance, adhesive force, corrosion resistance and bending resistance through the synergistic effect of all the components, is suitable for surface protection of the color-coated aluminum plate strip, and can effectively improve the fire resistance rating and prolong the service life of the aluminum plate strip.

This invention discloses a nitrogen-phosphorus flame retardant, a composition and composite material containing the flame retardant, its preparation method, and its application. The flame retardant has a structure as shown in formula (I), where n is an integer from 100 to 150. The preparation method of the flame retardant includes: synthesizing bis(4-formylphenyl) phenylphosphonate and bis(4-aminophenyl)phenylphosphonate, reacting the two to generate a Schiff base, and then reacting it with 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide to obtain the nitrogen-phosphorus flame retardant PCNPO. This flame retardant, when compounded with melamine cyanurate (MCA), can be used to prepare flame-retardant nylon 6 composite materials. This invention, through the synergistic effect of PCNPO and MCA, enables nylon 6 to achieve the UL94 V-0 flame retardant standard at a low addition level, while maintaining excellent mechanical properties and processing stability, and exhibiting strong charring ability, simple process, and environmental friendliness. (I)

The invention relates to the technical field of single-phase immersion type liquid cooling liquid, and particularly provides single-phase immersion type composite cooling liquid for high-power electronic equipment and a preparation method, and the composite cooling liquid is composed of poly-alpha-olefin, a composite heat conduction component, a composite flame-retardant system and a functional auxiliary agent. The method comprises the following steps: mixing nano boron nitride, graphene and a silane coupling agent which accounts for 1-2% of the total mass of the nano boron nitride and the graphene, and stirring to finish surface modification; heating poly-alpha-olefin, adding the modified composite heat-conducting component, and continuously stirring at a high speed to obtain a mixture; after the heat-conducting phase is dispersed, cooling the mixture, adding a composite flame-retardant system composed of phosphate and melamine cyanurate, and stirring; adding a functional auxiliary agent, and continuously stirring until the functional auxiliary agent is completely dissolved and uniformly dispersed; the finished cooling liquid is obtained. Through collaborative optimization of all the components, the comprehensive performance of high heat conductivity, strong flame retardance, excellent chemical stability and wide material compatibility is achieved at the same time.

This invention discloses a polyolefin flame-retardant masterbatch and its preparation method, which is prepared from 60-80 parts of polyolefin, 10-16 parts of melamine cyanurate, 2-4 parts of zinc aluminate, and 0.1-0.3 parts of antioxidant in parts by weight. The zinc aluminate in the polyolefin flame-retardant masterbatch prepared by this invention produces alumina during decomposition, which can promote the carbonization of the polyolefin resin matrix. Furthermore, the zinc aluminate forms an interwoven network structure in the polyolefin matrix, resulting in a continuous, flocculent protective char layer with a network structure on the surface of the polyolefin material during combustion. Therefore, it can increase the final char residue of the polyolefin composite material, achieving a flame-retardant effect.

The invention provides an environment-friendly flame-retardant master batch based on copolymerization and in-situ polymerization, a preparation method of the environment-friendly flame-retardant master batch and an application method of the environment-friendly flame-retardant master batch in a polyamide material. Pyridine heterocyclic ring-containing amide salt, melamine cyanurate and a polyamide monomer are subjected to copolymerization and in-situ polymerization to obtain the environment-friendly flame-retardant master batch. The environment-friendly flame-retardant master batch and a polyamide material are subjected to melt blending to obtain the flame-retardant modified polyamide material. According to the environment-friendly flame-retardant master batch, based on the double synergistic effect of chemical quenching and physical dilution of an efficient nitrogen-nitrogen synergistic mechanism, the limit oxygen index and the flame-retardant efficiency of a polyamide material are remarkably improved, and the effect of rapid self-extinguishing under the condition of relatively low addition amount is achieved.

The application provides a preparation method of melamine cyanurate coated phosphorus flame retardant and application of the flame retardant in flame-retardant water-based polyurethane artificial leather. In the preparation method, melamine cyanurate is coated on the surface of phosphorus flame retardant powder in an in-situ polymerization manner, and a solvent containing no ethanol is used as a reaction medium in the reaction process, so that the advantages of environmental protection, safety, high yield and high conversion rate are achieved, and the melamine cyanurate coated phosphorus flame retardant has a synergistic effect on the flame-retardant performance.

The invention provides a polyethylene composition as well as a preparation method and application thereof, and the polyethylene composition comprises the following components in parts by weight: 54-71 parts of low-density polyethylene, 9-16 parts of linear low-density polyethylene, 15-35 parts of a composite flame retardant, 0.1-1 part of an antioxidant and 0.1-1 part of an anti-dripping aid, wherein the composite flame retardant comprises a phosphoric acid flame retardant, an inorganic zinc salt flame retardant, melamine polyphosphate and melamine cyanurate; the polyethylene composition provided by the invention has high flame retardancy, high toughness and high flow processability under the conditions of no halogen-containing flame retardancy, safety and environmental protection.

The invention discloses a tin coating protective agent and a local gold removing and tin coating process for a multi-row high-density pin connector. The tin coating protective agent is prepared from the following components in parts by mass: 40 to 50 parts of waterborne acrylic emulsion, 10 to 20 parts of organic silicon resin, 0.5 to 2 parts of fumed silica, 0.1 to 0.5 part of defoaming agent, 5 to 10 parts of filler, 0.1 to 1 part of flatting agent, 0.1 to 0.5 part of thickening agent, 1 to 5 parts of melamine cyanurate and 1 to 3 parts of cellulose ether. The multi-row high-density pin connector local gold removing and tin coating process comprises the following steps that S1, the protective agent is applied to a non-tin coating part needing to be protected, and curing is carried out to form a protective film; s2, immersing the pin part which needs to be subjected to gold removal and tin coating into a tin pot, removing a gold layer and forming a uniform tin layer; s3, carrying out repair welding treatment on the tin-connected pins; s4, removing the applied protective agent; through the process, unnecessary part tinning is avoided.

The invention relates to the technical field of melamine cyanurate production, in particular to a high-quality MCA production process and a high-quality MCA production device, the high-quality MCA production process comprises a tank body and a mixing assembly arranged in the middle of the tank body, and the mixing assembly comprises a material pushing part arranged in the middle of the tank body and a dispersing part arranged in the tank body; a mixing assembly is arranged in the tank body on the outer side of the material pushing part, when two solutions need to be mixed, the two solutions are put into the dispersing part and the tank body respectively, the material pushing part is started, the material pushing part disperses the solutions in the dispersing part into the tank body at a constant speed, and meanwhile the material pushing part drives the mixing assembly to continuously stir the solutions in the tank body; perfect regulation and control on mixing of the two solutions are realized.