906 results about "Polypropylene composites" patented technology

The invention discloses a polypropylene composite material based on rare earth element modification and a preparation method and application thereof, and belongs to the technical field of medical instruments, and the polypropylene composite material comprises the following raw materials in parts by weight: 100 parts of medical grade PP, 3-8 parts of a rare earth organic complex, 5-10 parts of nano-hydroxyapatite, 2-5 parts of a maleic anhydride grafted PP compatilizer and 0.3-0.5 part of an antioxidant, the invention also provides specific preparation steps and application thereof. According to the invention, oxide + salt bimorphological rare earth and an organic ligand are complexed to form a rare earth organic complex, so that the problem of poor dispersity of inorganic rare earth is solved, and meanwhile, the material is endowed with antibacterial and antistatic functions; through a melt blending-in-situ fiber forming process, the rare earth complex forms gradient distribution in a polypropylene matrix, the surface layer is enriched with antibacterial components, and the inner layer is enhanced in mechanical property, so that a low-cost solution with high strength, antibacterial property and biocompatibility is provided for high-end medical instruments, and the market blank is filled.

The invention relates to the technical field of flame-retardant polypropylene composite materials, in particular to a flame-retardant reinforced polypropylene composite material containing flame-retardant modified glass fibers and a preparation method of the flame-retardant reinforced polypropylene composite material. The flame-retardant modified glass fiber-containing flame-retardant reinforced polypropylene composite material is prepared from the following raw materials: 30 to 60 parts of polypropylene, 5 to 60 parts of flame-retardant modified glass fiber, 5 to 20 parts of piperazine pyrophosphate, 5 to 20 parts of melamine polyphosphate, 0.5 to 5 parts of flame-retardant synergist, 1 to 6 parts of maleic anhydride ester-grafted polypropylene, 0.5 to 3 parts of coupling agent, 0.3 to 3 parts of lubricant and 0.2 to 0.5 part of antioxidant. The flame-retardant modified glass fibers are glass fibers subjected to surface modification by using a focused piperazine phosphate-melamine polyphosphate random copolymer. According to the technical scheme, the problem that the mechanical property and flame retardant property of glass fiber reinforced polypropylene in the prior art are difficult to optimize at the same time can be solved, and the glass fiber reinforced polypropylene has ideal popularization and application prospects.

The invention relates to the technical field of high polymer materials, and particularly discloses a high-strength polypropylene composite material for a filter plate and a preparation method of the high-strength polypropylene composite material. The preparation method of the polypropylene composite material comprises the following steps: uniformly mixing polypropylene, polyimide, maleic anhydride grafted polypropylene, nylon 6, a maleic anhydride grafted styrene-butadiene-styrene copolymer, aminated calcium carbonate, modified glass fiber, an antioxidant and a lubricant according to a mass ratio of 100: (12-18): (2-5): (1-2): (3-5): (3-7): (6-10): (0.2-0.5): (0.1-0.3), carrying out melt blending, extruding, cooling, granulating, and carrying out extrusion molding to obtain the polypropylene composite material. Through the synergistic effect of the nano calcium carbonate and the glass fibers, the mechanical property of polypropylene is improved, all the raw materials are crosslinked to form a uniform network structure, more energy is absorbed when a matrix is impacted by external force, and it is guaranteed that the filter pressing plate is not damaged when deforming under the high-temperature and high-pressure conditions; the obtained polypropylene composite material is high in strength, good in heat resistance and excellent in comprehensive performance.

The invention relates to the technical field of polypropylene, and discloses a high-strength polypropylene composite material as well as a preparation method and application thereof in an automobile bumper. The high-strength polypropylene composite material comprises the following components in parts by weight: 70-90 parts of polypropylene resin, 10-30 parts of polycarbonate resin, 25-40 parts of glass fibers, 3-10 parts of an allyl carbonate grafted polypropylene compatilizer and the like. The compatilizer contains carbonate groups similar to polycarbonate, so that the compatibility between polypropylene resin and polycarbonate resin is improved, and the compatilizer has higher mechanical properties. Moreover, the compatilizer contains carboxyl and can form interaction with the surface of the glass fiber, so that the compatibility between the glass fiber and the polypropylene resin is improved, the glass fiber has a better reinforcing effect, the tensile strength, the impact strength and the bending strength of the composite material are remarkably improved, and the compatilizer has good practical application in the aspects of automobile bumpers and the like.

The invention discloses a corrosion-resistant and anti-aging plastic packaging film and a preparation method thereof, and is used for solving the technical problem that the corrosion resistance and ultraviolet aging resistance of a packaging film in the prior art need to be further improved. The polypropylene composite material comprises the following raw materials in parts by weight: 60-80 parts of modified polypropylene resin, 1-2 parts of a compound nucleating agent, 10-15 parts of a modified filler, 1-2 parts of an antioxidant, 1-2 parts of an ultraviolet light absorber, 1-2 parts of a light stabilizer and 3-5 parts of a plasticizer, the tensile property of the material is improved through crystal form remolding, and the flame retardant property of the material is improved through synergistic cooperation of an internal phosphate structure, an aluminum element and thiocyanuric acid and siloxane chain segments in the material; and the ultraviolet light absorber cross-linked by the compound nucleating agent, the modified filler and the siloxane chain segment are synergistically matched, so that the ultraviolet aging resistance of the material is remarkably improved.

The invention discloses a talcum powder filled regenerated polypropylene composite material and a preparation method thereof, and relates to the technical field of regenerated polypropylene. The talcum powder filled regenerated polypropylene composite material comprises the following raw materials in parts by mass: 100 parts of regenerated polypropylene, 15-18 parts of a nucleating agent, 8-10 parts of a cross-linking agent, 0.1-0.3 part of an initiator, 0.5-1 part of an antioxidant, 0.5-0.7 part of a light stabilizer and 1-2 parts of a lubricant. The regenerated polypropylene comprises a regenerated polypropylene master batch and a modified polypropylene master batch in a mass ratio of 1: (1-2); the nucleating agent comprises modified talcum powder and an organic carboxylate nucleating agent in a mass ratio of 50: (1-2). According to the regenerated polypropylene composite material provided by the invention, the mechanical property of regenerated polypropylene is remarkably improved, and the generation of volatile irritant gas after processing is reduced.

The invention discloses a carbon fiber / polypropylene composite material as well as a preparation method and application thereof, and belongs to the technical field of composite materials. The invention aims to regulate and control the interface structure and the adhesive property of the carbon fiber / polypropylene composite material. The preparation method comprises the following steps: firstly preparing a polyethyleneimine solution to soak carbon fibers, then preparing a suspension of a modified material to treat the carbon fibers, and carrying out temperature-controlled crystallization to prepare the carbon fiber / polypropylene composite material. The polyethyleneimine solution treatment is the key for the modified material to be adhered to the surface of the carbon fiber, the interface structure of the carbon fiber / polypropylene composite material can be effectively regulated and controlled by selecting the appropriate suspension concentration of the modified material, the interface bonding strength and the mechanical property of the composite material are improved, and the industrial application requirements are better met.

The invention relates to the technical field of fan shell materials, in particular to an antibacterial PP (polypropylene) fan shell material and a preparation method thereof. The polypropylene composite material is prepared from the following components in parts by weight: 80 to 90 parts of polypropylene composite material, 1 to 3 parts of polyethylene glycol grafted maleic anhydride, 1 to 5 parts of modified lignin, 8 to 15 parts of nano modified montmorillonite, 1 to 4 parts of silver nitrate, 1 to 3 parts of coupling agent KH550, 0.1 to 0.5 part of calcium stearate and 0.3 to 0.6 part of antioxidant, through double modification of lignin and three-step modification of montmorillonite, the dispersity and interface bonding strength of the filler are remarkably improved, the tensile strength of the material is improved by 37% or above, and meanwhile good toughness is kept; a multi-component synergistic system realizes the persistence of the antibacterial performance, and the antibacterial efficiency of 95% or above is still kept after 7 days. Thirdly, through the synergistic effect of the modified lignin and the nano-montmorillonite, the thermal stability of the material is remarkably improved, and the initial degradation temperature is increased by 20-35 DEG C.

The invention discloses an interface covalently bonded core-shell structure boron nitride polypropylene composite dielectric material and a method. The interface covalently bonded core-shell structure boron nitride polypropylene composite dielectric material comprises a maleic anhydride grafted polypropylene matrix and a core-shell structure filler dispersed in the maleic anhydride grafted polypropylene matrix, the core-shell structure filler comprises hydroxylated boron nitride nanoparticles covalently grafted on a polymer shell layer on the surface of the core-shell structure filler; the polymer shell layer is polyglycidyl methacrylate; the epoxy group of the polymer shell layer reacts with the anhydride group of the maleic anhydride grafted polypropylene matrix to form a covalent bond. The invention has the characteristics of strong interface bonding force, uniform filler dispersion, and excellent comprehensive electrical properties and processability.

The invention provides a creep-resistant polypropylene composite material, a preparation method and application, the creep-resistant polypropylene composite material comprises 60-80 parts of composite polypropylene resin, 10-30 parts of glass fiber, 1-5 parts of an MOF filler, 2-5 parts of a compatilizer, 0.1-1 part of an antioxidant and 0.1-0.5 part of a nucleating agent, and the MOF filler is a silane coupling agent modified MOF filler. MOF with good thermal conductivity and thermal stability is introduced into a glass fiber reinforced polypropylene system and is subjected to silane modification, so that the MOF is uniformly distributed in polypropylene and acts together with glass fibers to form more heat conduction channels and effectively transfer loads; meanwhile, due to interaction of special metal clusters and organic ligands of the MOF, stress mismatching between the polypropylene and the glass fibers can be balanced through microstructure changes, so that the creep resistance of the material is improved; in addition, the MOF filler has a large specific surface area and a porous structure, so that the lightweight characteristic of the material is effectively improved.

The invention provides a flame-retardant high-modulus polypropylene composite material and a preparation method thereof, and relates to the technical field of composites.The flame-retardant high-modulus polypropylene composite material comprises a matrix phase, and the matrix phase comprises, by weight, 50-60 parts of polypropylene, 30-40 parts of a phosphorus-nitrogen flame retardant, 3-5 parts of a compatilizer and 0.5-1.5 parts of a dispersing agent; wherein the matrix phase comprises the following components in parts by weight: 0.5 to 1.5 parts of a scratch-resistant agent and 0.1 to 0.5 part of an antioxidant, the dispersing agent is an imidized isobutylene-maleic anhydride copolymer, the compatilizer is a polystyrene-oxazoline graft polymer, and the matrix phase further comprises the following components in parts by weight: 0.5 to 1.5 parts of a scratch-resistant agent and 0.1 to 0.5 part of an antioxidant. The flame-retardant high-modulus polypropylene composite material disclosed by the invention can comprehensively improve the flame-retardant property and the scratch resistance of the flame-retardant high-modulus polypropylene composite material.

The invention relates to the technical field of polypropylene, and discloses a high-barrier polypropylene composite material and a preparation method thereof, the high-barrier polypropylene composite material comprises 55-80 parts by weight of polypropylene, 20-45 parts by weight of cardanol modified polystyrene, and 1.2-2 parts by weight of maleic anhydride grafted polypropylene; according to the invention, an alkyl long chain of cardanol is introduced into a side chain of polystyrene, and the alkyl long chain and polypropylene are subjected to a physical chain winding effect, so that a tight physical crosslinking is formed, the crosslinking density of a polypropylene molecular chain is improved, the water vapor permeability is reduced, and the barrier property is improved. The cardanol modified polystyrene contains hydroxyl groups and reacts with the compatilizer maleic anhydride grafted polypropylene, so that the compatibility between the polystyrene and the polypropylene is improved, the polystyrene and the polypropylene form an alloy system, higher mechanical properties are shown, and the tensile strength and the bending strength are improved.

The invention belongs to the technical field of composite materials, and particularly discloses a polypropylene composite material, a preparation method thereof and automobile interior and exterior ornaments.The polypropylene composite material is prepared from, by weight, 40-60 parts of first polypropylene resin, 15-25 parts of second polypropylene resin, 6-25 parts of flexibilizer, 18-23 parts of talcum powder, 0.1-1.5 parts of weather-proof agent and 1.5-3 parts of antioxidant; wherein the melt index of the first polypropylene resin is smaller than that of the second polypropylene resin; the mesh number of the talcum powder is 2250 to 5000. The polypropylene composite material has relatively high low-temperature impact resistance and relatively high rigidity, and can improve the safety performance of an automobile when being applied to interior and exterior ornaments of the automobile.

The invention discloses a nanofiber-containing polymer composite material and a preparation method thereof, and the nanofiber-containing polymer composite material is prepared from the following raw materials in parts by weight: 90-100 parts of polypropylene, 10-15 parts of nylon 6, 13-16 parts of a modified flame retardant, 4-7 parts of modified carbon nanotubes, 3-5 parts of a compatilizer, 0.5-0.8 part of an antioxidant and 0.3-0.5 part of a lubricant. According to the composite material, polypropylene and nylon 6 are blended, and a modified flame retardant prepared by a formulated method, a modified carbon nanotube, a synergistic compatilizer and other assistants are added, so that the defects that an existing polypropylene material is easy to degrade and inflammable, a traditional flame retardant and an antioxidant are easy to migrate and lose efficacy and the like are effectively overcome; according to the polypropylene composite material, the mechanical property of the material is maintained and improved while efficient flame retardance and excellent weather resistance and aging resistance (especially ultraviolet aging resistance) are achieved, the problem that in the prior art, performance in multiple aspects is difficult to consider is solved, and the application range of the polypropylene composite material is widened.

The invention discloses a bio-based polypropylene composite material, a preparation method of a vehicle door interior decorative plate structure, the vehicle door interior decorative plate structure and a vehicle, and relates to the technical field of vehicles, and the bio-based polypropylene composite material comprises, by mass, 38-42 parts of bio-based polypropylene; 35 to 40 parts by mass of homo-polypropylene; 7-10 parts by mass of a toughening agent; 2-3 parts by mass of a reinforcing agent; 10-20 parts by mass of a filler; 3-5 parts by mass of a compatilizer; and 0.3 to 0.5 part by mass of a lubricant. According to the technical scheme provided by the invention, the density of the decorative plate body can be reduced under the condition that the strength and the rigidity are ensured, namely, the weight of the decorative plate body is reduced, so that the carbon emission of the decorative plate body can be reduced while the light weight of the decorative plate body is realized.

The invention relates to the technical field of high polymer materials, and discloses a low-VOC (volatile organic compound) polypropylene composite material and a preparation process thereof, the low-VOC polypropylene composite material comprises the following raw materials: polypropylene, maleic anhydride grafted polypropylene, fluorenyl silicone oil, benzophenone coated talcum powder, activated carbon, an antioxidant, a plasticizer and a lubricant; the interface bonding force between a siloxane long-chain flexible structure and a polypropylene matrix material is improved by preparing fluorenyl silicone oil, the thermal stability of the composite material is effectively improved by combining fluorene rings, thermal decomposition products are reduced, VOC components are physically adsorbed and captured through a multilevel porous structure of activated carbon, VOC volatilization can be effectively reduced, and the environmental protection capacity of the composite material can be enhanced. Meanwhile, benzophenone-coated talcum powder is added into the polypropylene composite material matrix, so that the wear resistance and ultraviolet resistance of the polypropylene composite material matrix are enhanced, and the service life of the polypropylene composite material is effectively prolonged.

The invention discloses a high-thermal-conductivity polypropylene composite material and a preparation method thereof, and belongs to the technical field of high polymer material modification. The high-thermal-conductivity polypropylene composite material comprises the following components in parts by mass: 70-80 parts of polypropylene resin; 20 to 30 parts of graphene oxide; 0.1 to 0.5 part of a double-walled carbon nanotube; 5 parts of maleic anhydride grafted polypropylene; and 1 part of an auxiliary agent. Wherein the adopted graphene oxide has a two-position structure, the double-walled carbon nanotube has a one-dimensional structure, and both the graphene oxide and the double-walled carbon nanotube have very high heat conductivity coefficients; when the two materials are added into polypropylene at the same time, the micro-content of the double-walled carbon nanotube with the one-dimensional structure plays a role in lapping in the melt blending process, and forms a network structure together with the graphene oxide with the two-dimensional structure, so that the heat-conducting property of the polypropylene composite material is greatly improved.

The invention relates to a biaxially oriented polypropylene composite film for a capacitor and a preparation method of the biaxially oriented polypropylene composite film. The biaxially oriented polypropylene composite film is of an ABA three-layer structure; wherein the layer A is prepared from the following raw materials: PP, a nucleating agent and a composite filler of MAH-g-PP and nanoparticles; the layer B is prepared from the following raw materials: PET master batch, modified silicon dioxide and a brush polymer. According to the preparation method, the three-layer structure composite film is prepared, the layers are firmly combined through covalent bonds, hydrogen-bond interaction and the like, and the interlayer peel strength is remarkably improved; a nano particle filler with a high dielectric constant is introduced into the A-layer structure, so that the dielectric strength of the film is improved, and meanwhile, the film has relatively high anti-breakdown strength; and the layer B effectively improves the mechanical stability of the film material, and has higher mechanical property and material rigidity compared with the traditional PP film.

The invention provides a calcium carbonate modified polypropylene composite material and a preparation method thereof.The preparation method comprises the steps that calcium carbonate powder and a surfactant containing double bonds are mixed and stirred at the high temperature for preset time, and surface modified calcium carbonate is obtained; and mixing the surface modified calcium carbonate with polypropylene and an initiator, stirring for a preset time, and carrying out melt extrusion at 170-210 DEG C to obtain the calcium carbonate modified polypropylene composite material. The preparation method provided by the invention has the advantages of rapid activation and simple process, and the prepared surface modified calcium carbonate powder has the advantages of concentrated size distribution, uniform particle size and high activation degree, has good compatibility with polyolefin materials, can enhance the tensile strength and other mechanical properties of a composite material when being filled into a polymer, and has good application prospects. And good economic benefits are achieved.

The invention discloses a polypropylene composite material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials, the polypropylene composite material comprises the following components in parts by weight: 100 parts of polypropylene resin, 14-32 parts of acrylate monomer, 0.14-0.32 part of chain transfer agent, 0.14-0.32 part of initiator, 0.9-11 parts of 3-methacryloyldopamine-maleic anhydride copolymer and 0.04-0.32 part of nucleating agent; the mass percentage content of 3-methacryloyl dopamine in the 3-methacryloyl dopamine-maleic anhydride copolymer is 5 to 25 percent. The polypropylene composite material has excellent coating adhesive force and aging resistance, is very suitable for preparing automobile parts, and is especially suitable for preparing automobile bumpers.

The invention relates to the technical field of production of fiber-reinforced thermoplastic composite prepreg and composite laminated plates thereof, in particular to a production method of high-strength polypropylene fiber-reinforced polypropylene resin unidirectional prepreg and a composite material. The method mainly comprises the following steps: straightly and tightly arranging and unfolding a certain number of polypropylene fibers, extruding a casting film from polypropylene resin through a screw, laminating and infiltrating the polypropylene resin and the polypropylene fibers, and pressing and coiling through a cold pressing roller to prepare the unidirectional belt. The one-way prepreg of the polypropylene self-reinforced composite material is paved according to a certain paving direction and thickness and then is subjected to hot pressing to prepare a polypropylene self-reinforced composite material laminated plate with a certain size and thickness. Or slitting the polypropylene self-reinforced composite material unidirectional prepreg, weaving the slit unidirectional prepreg with relatively narrow width, cutting and paving according to a certain size, or mixing and paving with a single-line prepreg tape, and performing hot pressing to form the polypropylene composite material laminated plate.

The invention relates to the technical field of polypropylene composite materials, and discloses a high-strength antibacterial polypropylene composite material and a preparation method thereof, the polypropylene composite material comprises 60-90 parts by weight of polypropylene, 10-40 parts by weight of nylon 6, 2-8 parts by weight of maleic anhydride grafted polypropylene, 0.5-2 parts by weight of an arginine antibacterial agent and the like. The arginine antibacterial agent has good compatibility with polypropylene and nylon 6, is uniformly dispersed in the composite material, has little influence on the mechanical properties of the material, and can maintain very high tensile strength and impact strength. A side chain of the arginine antibacterial agent contains a large number of guanidyl antibacterial groups, and the arginine antibacterial agent is good in heat resistance, not prone to thermal decomposition, uniformly dispersed in a composite material matrix and capable of effectively killing staphylococcus aureus and escherichia coli, so that the composite material has very high antibacterial performance.

The invention discloses a polypropylene composite material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The invention provides a polypropylene composite material. The polypropylene composite material comprises the following components in parts by weight: 40-80 parts of copolymerized PP (polypropylene), 5-25 parts of POE (polyolefin elastomer), 5-25 parts of polyisobutene and 10-30 parts of filler, the number-average molecular weight of the polyisobutene is greater than 600. The POE elastomer, the polyisobutene and the filler are introduced into the copolymerized PP, so that the polypropylene composite material with low sink mark characteristic and good mechanical property can be obtained.

The invention discloses a preparation technology for preparing a high-strength PP composite material based on waste plastic regeneration, and belongs to the technical field of regenerated PP composite materials. Cleaning and crushing the separated polypropylene plastic, adding the crushed polypropylene plastic, the maleic anhydride grafted polypropylene, the composite flame-retardant powder, the reinforcing agent, the modified organic silicon resin and the antioxidant 1010 into an internal mixer, carrying out melt blending, and discharging to obtain the high-strength polypropylene composite material. The polypropylene fragments, the composite flame-retardant powder, the reinforcing agent and the modified organic silicon resin are subjected to melt blending, so that the flame retardance, the oxidation resistance, the tensile strength and the cantilever beam notch impact strength of the regenerated polypropylene are further improved.

The present invention belongs to the technical field of polymer modified materials, and specifically relates to an aging-resistant, flame-retardant polypropylene composite material, and a preparation method and application thereof. The aging-resistant, flame-retardant polypropylene composite material of the present invention comprises the following raw materials in parts by weight: 20 to 60 parts of polypropylene resin; 1 to 10 parts of compatibilizer; 5 to 25 parts of EPDM rubber recycled material; 5 to 30 parts of smoke suppression flame retardant; 0.1 to 2 parts of light stabilizer; 0.1 to 2 parts of antioxidant; 10 to 40 parts of glass fiber. The aging-resistant, flame-retardant polypropylene composite material of the present invention has excellent mechanical properties, as well as light and heat aging resistance; tensile strength>85MPa, bending modulus>6000MPa, cantilever beam notched impact strength>165J / m, and strength is higher than that of wood. The injection-molded building formwork will not break when it falls vertically from a height of 3m, and can reach the B2 level of combustion performance of building materials and their products.

A formula of the reinforced and toughened carbon nanotube modified polypropylene resin comprises a carbon nanotube filler, hexadecyl trimethyl ammonium bromide, chopped glass fibers, polyvinylpyrrolidone, gamma-aminopropyltriethoxysilane, an ethylene-octylene copolymer, 3, 3 ', 5, 6-tetramethyl-3, 5, 6-tetramethyl-3, 5, 6-tetramethyl-3, 5, 6-tetramethyl-3, 5, 6-tetramethyl-3, 5, 6-tetramethyl-3, 5, 6-tetramethyl-3, 6-tetramethyl-3, 5, 6-tetramethyl-3, 6-tetramethyl-3, 6-tetramethyl-3, the invention discloses a polypropylene composite material, which is composed of a carbon nanotube filler, a polypropylene matrix, 2, 3 ', 5, 5'-tetramethyl benzidine and maleic anhydride grafted polypropylene, the carbon nanotube filler is subjected to surface modification by hexadecyl trimethyl ammonium bromide to form a carbon nanotube reinforcement with a surface hydrophilic layer, and chopped glass fibers are arranged in an oriented manner in an extrusion direction in a melt blending process to synergistically enhance the mechanical strength of the polypropylene matrix; the ethylene-octylene copolymer is subjected to melt blending to form toughening particles, 3, 3 ', 5, 5'-tetramethyl benzidine induces a polypropylene matrix to form rod-like long-grain beta crystals, and high toughness of the matrix is achieved synergistically; the synthesized polypropylene matrix can be used for preparing a fiber composite material. The fiber composite material prepared by the invention has excellent mechanical strength, and the toughness and impact resistance are remarkably improved.

The invention discloses a toughened flame-retardant polypropylene composite material based on grading synergy and a preparation method thereof. The polypropylene composite material comprises the following raw materials in parts by weight: 100 parts of polypropylene, 10-15 parts of composite inorganic rigid particles, 15-18 parts of a composite flame retardant, 3-5 parts of an elastic interface agent, 0-3 parts of a toughening agent, 0.5-1 part of a dispersing agent and 0.3-0.5 part of a nucleating agent, the elastic interface agent is used for dispersing and coating the graded inorganic rigid particles and the graded flame retardant to form an elastic modified material with a core-shell structure, and the elastic modified material is used for polypropylene, so that the microcrack propagation direction during impact can be effectively changed, interface fracture caused by overlarge local stress during impact yield is prevented, and the impact resistance of the material is greatly improved. The flame retardant is uniformly dispersed in polypropylene through interface modification, so that a good flame retardant effect is achieved, and the problem that the mechanical property of the material is reduced due to addition of the flame retardant is avoided.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a low-odor polypropylene composite material as well as a preparation method and application thereof. The low-odor polypropylene composite material comprises the following components: PP resin, a filler, an antioxidant, a lubricant and a deodorant COF (at) ZnO composite material, the COF material has a porous structure and regular pore channels, shows high porosity and high surface area, is rich in benzene ring structure, and adsorbs benzene series and other small molecular substances generated during melt extrusion of polypropylene by conjugate action and physical action; nano ZnO is dispersed on the surface of the COF material and can play a role in photocatalysis and degradation of VOCs substances, meanwhile, a COF framework can accelerate electron transfer to promote catalysis, odor improvement is achieved through the synergistic effect of nano ZnO and COF framework, and the problem that in the prior art, a polypropylene material volatilizes odorous gas is solved.

The invention discloses a polypropylene composite material and a preparation method thereof, the polypropylene composite material comprises the following raw material components by weight: 65-85 parts of polypropylene, 5-15 parts of maleic anhydride grafted polypropylene, 5-12 parts of a filler, 1-3 parts of a plasticizer, 0.5-1.5 parts of a lubricant, 0.5-2 parts of an anti-aging agent, and 1-5 parts of glass fiber, and the filler is composite modified palygorskite. The invention also provides a preparation method of the polypropylene composite material, and the polypropylene composite material is prepared by mixing and melting the raw material components, extruding by a twin-screw extruder and granulating. Compared with the prior art, the polypropylene composite material prepared by the invention not only has excellent flame retardant property, but also has better tensile strength and lower molding shrinkage rate.

The invention discloses a modified multi-walled carbon nanotube, a preparation method thereof and a conductive polypropylene composite material containing the modified multi-walled carbon nanotube, and the preparation method of the modified multi-walled carbon nanotube comprises the following steps: S1, taking lauryl sodium sulfate, adding the lauryl sodium sulfate into water, and fully dissolving to prepare a lauryl sodium sulfate solution with the concentration of 3-5mmol / L; s2, adding a multi-walled carbon nanotube into the solution, and stirring for 5-6 hours; s3, adding a pyrrole monomer into the mixed solution in the step S2, and stirring for 1-3 hours; and then adding an initiator ammonium persulfate into the solution, and carrying out stirring reaction at 20-30 DEG C for 4-6 hours to prepare the polypyrrole-coated multi-walled carbon nanotube. The prepared modified multi-walled carbon nanotube has an excellent coating effect, and the dispersing performance and the conductivity of the modified multi-walled carbon nanotube in a polypropylene material can be improved, so that the conductive polypropylene composite material is endowed with a stable and excellent conductive effect under the condition that the addition amount is reduced, and the modified multi-walled carbon nanotube has practical application significance.