341 results about "Linear low-density polyethylene" patented technology

The invention discloses a large-current-carrying-capacity flexible power cable, which belongs to the technical field of cable preparation, is used for solving the technical problem that the flame retardant property and the mechanical property of the power cable need to be further improved in the prior art, and specifically comprises a cable core, a wrapping layer, an insulating layer and a sheath layer which are sequentially arranged from inside to outside. The preparation method comprises the following steps: preparing alkoxy silane containing a benzocyclobutene group, preparing flame-retardant particles by using a sol-gel method, preparing modified polyurethane by using modified polysiloxane and 2, 5-furandimethanol as soft segments, naphthalene diisocyanate as a hard segment and trimethylolpropane as a chain extender, and preparing the flame-retardant flame-retardant polyurethane. The linear low-density polyethylene, the MAH-g-PE, the modified polyurethane, the flame-retardant particles and the auxiliary additive are melted and extruded outside the wire core to form the insulating layer, so that the power cable is obtained, the flame-retardant property of the power cable is effectively improved, and the mechanical property and the current-carrying stability of the power cable are also improved.

An extreme-cold resistant low-fume halogen-free flame-retardant polyolefin sheath, a preparation method therefor, and a cable. The sheath comprises the following raw materials in parts by mass: 4-16 parts of an ethylene-vinyl acetate copolymer, 7-13 parts of a phosphate group functionalized linear low-density polyethylene, 9-15 parts of an ethylene-octene copolymer, 5-10 parts of a maleic anhydride-grafted ethylene-methyl methacrylate copolymer, 10-15 parts of magnesium hydroxide, 40-50 parts of aluminum hydroxide, etc. The preparation method for the phosphate group functionalized linear low-density polyethylene comprises: adding a catalyst to a pre-cooled ethylene monomer, adding a vinyl phosphate ester and an initiator after the reaction, and reacting for 1-2 hours at a temperature of 65-75°C and a pressure of 15-35 Mpa and then terminating the reaction, thereby obtaining the phosphate group functionalized linear low-density polyethylene. Compared with unfunctionalized polyethylene, the phosphate group functionalized polyethylene used has greatly improved low-temperature and flame-retardant performance, and can improve the overall flame-retardant and low-temperature performance of the formula.

The invention relates to the technical field of polymer functional material processing, and particularly discloses a polyethylene waterproof breathable film using PTFE micro powder as an opening agent and a preparation method of the polyethylene waterproof breathable film. The waterproof breathable film is prepared from the following components in parts by weight: 50-70 parts of linear low-density polyethylene, 10-40 parts of PTFE (Polytetrafluoroethylene) micro powder, 3-8 parts of a modified compatilizer and an auxiliary agent. The preparation method comprises the following steps: S1, activating PTFE micro-powder by a silane coupling agent and coating the PTFE micro-powder with polyethylene wax to obtain modified micro-powder; s2, uniformly mixing all the components; s3, carrying out melt extrusion at 180-210 DEG C through a double-screw extruder, and carrying out tape casting to form a cast sheet; s4, the casting piece is heated to 90-115 DEG C for two-way stretching, and micropores are formed through interface stripping between the PTFE particles and the base body; and S5, carrying out heat setting at 120-130 DEG C, cooling, and rolling to form the film. Through the synergistic effect of the self-made compatilizer and the pretreatment process, the interface anchoring force is enhanced, the problems of powder falling and water leakage of highly-filled PTFE are solved, and meanwhile, high moisture permeability, high hydrostatic pressure resistance and high mechanical property are taken into account.

The invention relates to the technical field of high polymer materials, and particularly discloses a B1-grade low-smoke halogen-free flame-retardant polyethylene cable material and an extrusion molding process thereof. The invention discloses a B1-grade low-smoke halogen-free flame-retardant polyethylene cable material. The cable material is prepared from the following raw material components in parts by weight: 50 to 70 parts of linear low-density polyethylene, 50 to 70 parts of ethylene-vinyl acetate copolymer, 40 to 60 parts of nanoscale magnesium hydroxide, 5 to 8 parts of microencapsulated red phosphorus, 10 to 15 parts of intumescent flame retardant, 3 to 5 parts of zinc borate and 2 to 4 parts of carbon nanotubes. According to the cable material, the ethylene-vinyl acetate copolymer can improve the dispersing performance of the inorganic filler, the composite flame retardant composed of the nanoscale magnesium hydroxide, the microencapsulated red phosphorus and the intumescent flame retardant is utilized, and the synergistic effect of the zinc borate and the carbon nanotubes is matched, so that the obtained cable material has better flame retardance, and the release of smoke is less.

A polymer processing aid (PPA) reduces melt defects in extruded polyolefins in the absence of fluoropolymers. A polymer processing aid comprising a block copolymer having polyamide blocks and polyether blocks reduces melt defects well in a thermoplastic polyolefin such as a linear low density polyethylene (LLDPE). Inclusion of an adjuvant PPA comprised of polycaprolactone, or polycaprolactone diol polymer further improves the melt fracture behavior in a thermoplastic and in the absence of fluoropolymers.

The invention discloses an intelligent early warning cable and a preparation method of the intelligent early warning cable, and belongs to the technical field of cables. The flame-retardant polyolefin composite material is prepared from the following raw materials in parts by weight: 5 to 10 parts of ethylene-vinyl acetate copolymer, 10 to 20 parts of linear low-density polyethylene, 10 to 15 parts of ethylene-octylene copolymer, 3 to 8 parts of compatilizer, 15 to 20 parts of organic modified vanadium dioxide, 30 to 40 parts of ionic liquid modified aluminum hydroxide, 1 to 1.5 parts of cross-linking agent and 1 to 2 parts of lubricant. Organic modified vanadium dioxide is introduced into a sheath layer material to serve as an intelligent early warning material, the cable sheath layer is endowed with the temperature change characteristic, when the local temperature of the cable is abnormally increased due to overload and other reasons, the material can trigger color change, and therefore a striking visual mark is formed in a complex wire harness, and the early warning effect is improved. And the problems of lag, low efficiency and existence of blind areas of the traditional monitoring means are solved.

The invention discloses a high-barrier antibacterial plastic packaging film and a preparation method thereof, belongs to the technical field of film processing, and aims to solve the technical problem that the antibacterial property and barrier property of a plastic packaging film need to be further improved in the prior art. The composite material specifically comprises the following components in parts by weight: 60-80 parts of linear low-density polyethylene, 10-15 parts of a modified compatibilizer, 4-6 parts of a modified antibacterial capsule and 1-3 parts of an auxiliary additive. The preparation method comprises the following steps: oxidizing 2-methyl-2-acrylic acid-2, 2, 6, 6-tetramethyl-4-piperidinyl ester with sodium hypochlorite to obtain a modified precursor, and carrying out free radical polymerization reaction on the modified precursor, low-density polyethylene, glycidyl methacrylate and vinyl heptafluorobutyrate to form a compatibilizer with a block structure. The antibacterial property and barrier property of the plastic packaging film are improved, and the mechanical property of the plastic packaging film is also improved.

The application belongs to the technical field of waterproofing of building engineering, and provides a high-strength puncture-resistant railway tunnel waterproofing and draining plate and a preparation method thereof, according to mass percentages, raw materials include: 30-35 wt% polyolefin elastomer POE, 40-45 wt% high-density polyethylene, 20-30 wt% antioxidant reinforcing master batch; the antioxidant reinforcing master batch includes, by weight parts: 6-8 parts of nano-SiO2, 20-28 parts of EPDM-g-MS, 60-70 parts of linear low-density polyethylene, 1-3 parts of antioxidant, and 1-3 parts of ultraviolet resistance agent. The railway tunnel waterproofing and draining plate provided by the application not only satisfies all the performances specified in Q / CR562.3-2018, but also has more excellent tensile properties and puncture resistance.

The invention discloses an anti-aging waterproof coiled material and a preparation process thereof, and relates to the technical field of waterproof coiled materials prepared from high-molecular compounds. According to the waterproof coiled material, linear low-density polyethylene serves as a matrix, and an antioxidant, a light stabilizer, an ultraviolet absorbent, a synergistic agent, a rare earth cerium complex, carbon black and other components are added in a matched mode. The preparation process comprises the steps of mixing ingredients, premixing and melting, extrusion molding, online rheology monitoring and temperature dynamic adjustment, cooling and shaping and the like. According to the invention, through construction of a multi-component synergistic anti-aging system, the components play a protection role in different stages and different paths of polymer degradation, and a three-dimensional protection network is formed; the prepared waterproof coiled material has excellent ultraviolet aging resistance and thermo-oxidative aging resistance, the product quality stability is high, the comprehensive performance is balanced, the service life is long, and the waterproof coiled material has good application prospects and economic value.

The present invention relates to a multilayer film comprising: an inner layer system comprising a first surface and a second surface; a first skin layer adhered to the inner layer system at the first surface of the inner layer system; and a second skin layer adhered to the inner layer system at the second surface of the inner layer system; wherein the inner layer system consists of a polymer formulation (A), wherein the polymer formulation (A) comprises: > 60.0 and < 90.0 wt% of a first ethylene-based polymer which is a linear low density polyethylene A (LLDPE A); and > 10.0 and < 40.0 wt% of a high density polyethylene (HDPE) having a density > 940 and < 970 kg / m 3 , preferably > 955 and < 970 kg / m 3 ; measured according to ASTM D792 (2008); and the first and / or second skin layer is a sealing layer comprising a second ethylene-based polymer which is a linear low density polyethylene B (LLDPE B) comprising polymerized moieties derived from ethylene and 1-octene or 1-hexene having a density > 890 and < 915 kg / m 3 , preferably > 900 and < 915 kg / m 3 , measured according to ASTM D792 (2008); preferably, wherein the sealing layer comprises > 70.0 wt% of the second ethylene-based polymer, or wherein the sealing layer consists of the second ethylene-based polymer; wherein the multilayer film is a biaxially oriented film, wherein the biaxial orientation is introduced in solid state. This film allows the production of a sealed package having a sufficiently high seal strength at reduced sealing temperature (also referred to as seal initiation temperature) which at the same time has improved tensile properties, such as an improved tensile modulus in machine and transverse direction and an improved tensile strength in machine and transverse direction, which has proven.

To provide a sealing sheet that has a desirable level of molding properties and heat resistance for use as a sealing sheet for solar cell modules. [Solution] A sealing sheet for solar cell modules, wherein the base resin is a polyolefin resin, and the polyolefin resin is a linear low-density polyethylene resin composed of at least one selected from the group consisting of α-olefin with 4 carbon atoms, α-olefin with 6 carbon atoms, and α-olefin with 8 carbon atoms, the α-olefin content is 12 to 13 mol%, and the Vicat softening point is 35°C or higher and 40°C or lower.

The application relates to the technical field of packaging materials, and discloses a high-impact multilayer heavy packaging film composition and a multilayer heavy packaging film and application thereof. The composition comprises an outer layer material, a core layer material and an inner layer material, wherein the core layer material contains linear low-density polyethylene, polypropylene and optional metallocene polyethylene; the components of the outer layer material and the components of the inner layer material are the same or different, and each contains linear low-density polyethylene, metallocene polyethylene, high-density polyethylene and ethylene-vinyl acetate copolymer or polyolefin elastomer. The multilayer heavy packaging film can improve the dart impact performance of the multilayer heavy packaging film.

The invention relates to the field of plastic products and preparation, and particularly discloses a breathable stretch-resistant flat pocket and a preparation method thereof. The breathable stretch-resistant flat bag comprises a high-density polyethylene-polypropylene composite film, a nanofiber net and linear low-density polyethylene which are sequentially compounded, wherein the nanofiber net is a PET nanofiber net; in addition, the preparation method has the advantages that the tensile property of the pocket is improved, and the air permeability of the pocket is not affected.

The invention provides a high-flame-retardant polyolefin sheath material and a preparation method thereof, a cable sheath and a cable product. The high-flame-retardant polyolefin sheath material comprises the following raw materials in parts by weight: 3-5 parts of an ethylene-vinyl acetate copolymer; 2-5 parts of linear low density polyethylene; 15 to 19 parts of a flexible binary polyolefin material; 3-6 parts of a compatilizer; 43-63 parts of a first flame retardant; 10 to 15 parts of a second flame retardant; 0.5 to 1 part of silicone master batch; 0.5-1 part of a rheological agent; 0.5 to 1 part of a coupling agent; 1-2 parts of a lubricant; and 1.5 to 2.5 parts of a weather-resistant material. The cable sheath material solves the problems of poor flame retardant property, poor melt flowability in the forming process, poor processability and insufficient weather resistance of the cable sheath material in the prior art.

The invention provides a low-smoke halogen-free high-flame-retardant power cable and a preparation method thereof, and the low-smoke halogen-free high-flame-retardant power cable comprises a conductor, an insulating layer and a sheath layer. The sheath layer is prepared from the following raw materials: 25 to 40 parts of ethylene-vinyl acetate copolymer, 15 to 25 parts of linear low-density polyethylene, 5 to 15 parts of metallocene polyethylene, 8 to 15 parts of reactive phosphorus-nitrogen-silicon hybrid compatibilizer, 12 to 22 parts of low-temperature sintered ceramic composite powder, 30 to 45 parts of surface-treated magnesium hydroxide, 15 to 25 parts of surface-treated aluminum hydroxide, 3 to 6 parts of organic modified montmorillonite and 1.5 to 2.5 parts of triallyl isocyanurate. 1.0 to 2.0 parts of a composite antioxidant, 1.0 to 2.5 parts of a calcium-zinc stabilizer and 0.5 to 1.5 parts of silicone master batch. The prepared low-smoke halogen-free high-flame-retardant power cable has excellent flexibility, mechanical property, heat resistance and processability, is stable in flame retardant property and stable in size, and is suitable for safety protection of power cables.

A multilayer film suitable for manufacturing a stretch hood used to secure palletized goods during shipment and transport. The multilayer film comprises at least three layers and includes a first layer comprising a linear low density polyethylene resin having a melt index within the range of 0.20 and 0.60 dg / min and a density within the range of 0.910 to 0.914 g / cm3, a second layer comprising a linear low density polyethylene resin having a melt index within the range of 0.20 and 0.60 dg / min and a density within the range of 0.910 to 0.914 g / cm3, and at least one intermediate layer in between the first and second layers, the intermediate layer or layers including a linear low density polyethylene resin having a fractional melt index and a thermoplastic polyolefin having a melt index within the range of 0.30 and 0.70 dg / 10 min and a density within the range of 0.870 to 0.890 g / cm. The multilayer film having a total thickness between 4.85 and 6.7 mils and a density between 0.909 and 0.913 g / cm3. A stretch hood fabricated from such multilayer film exhibits exceptionally high holding force and, provides robust stability when utilized on palletized goods during transport. A method of manufacture of such multilayer film is also provided.

The invention relates to the technical field of cables, in particular to a high-strength light weather-proof cable for an unmanned aerial vehicle and a preparation process of the high-strength light weather-proof cable. According to the invention, the insulating layer, the aramid silicone grease sheath layer and the polyethylene sheath layer are sequentially coated outside the conductor, so that the finished high-strength light weather-proof cable for the unmanned aerial vehicle is obtained. The preparation process of the polyethylene sheath comprises the following steps: mixing linear low-density polyethylene, an irradiation cross-linking agent and flame-retardant POSS (Polyhedral Oligomeric Silsesquioxane), and pre-irradiating to obtain pre-treated polyethylene; and mixing the pretreated polyethylene, high-density polyethylene resin, polyolefin elastomer resin, weather-resistant modified carbon nanotubes and magnesium calcium carbonate, and carrying out high-temperature blending and extrusion molding to obtain the polyethylene sheath. The finished product prepared by the invention has excellent weather resistance and flame retardance, and also has high strength, bending resistance and electromagnetic interference resistance, thereby having wide application prospects in the technical field of cables.

The invention belongs to the technical field of packaging materials, and particularly relates to an aluminum foil cover film with high stripping force and high acid resistance and a production process of the aluminum foil cover film. The aluminum foil cover film is formed by sequentially compounding a PET layer, an aluminum foil layer and a film blowing PE layer in a dry mode, the film blowing PE layer is composed of a layer A, a layer B and a layer C which are sequentially connected, and the aluminum foil layer is connected with the layer A through an adhesive; the layer A consists of first linear low-density polyethylene and second linear low-density polyethylene; the layer B is prepared from first linear low-density polyethylene, second linear low-density polyethylene and high-density polyethylene; and the layer C consists of first linear low-density polyethylene, third linear low-density polyethylene and an anti-blocking agent. The aluminum foil cover film prepared by the invention has relatively high stripping force, can effectively prevent layering and bag breaking when being used in a high-temperature and high-humidity environment, and has excellent acid resistance.

The invention provides a flame-retardant polyethylene master batch filled with magnesium hydroxide and a preparation method of the flame-retardant polyethylene master batch, and relates to the field of flame-retardant materials. The flame-retardant polyethylene master batch filled with magnesium hydroxide comprises the following raw materials in parts by mass: 8-20 parts of linear low-density polyethylene, 3-6 parts of an ethylene-octylene copolymer, 60-80 parts of modified magnesium hydroxide powder, 8-12 parts of montmorillonite powder, 3-5 parts of zinc borate, 2-5 parts of graphite powder, 1-4 parts of a lubricant, 4-8 parts of a coupling agent, 2-4 parts of barium stearate and 0.5-2 parts of an antioxidant. Compared with a common polyethylene material, the flame-retardant polyethylene master batch filled with magnesium hydroxide prepared by the invention has higher flame retardance, smoke suppression and carbon forming properties, also improves the dripping resistance of the polyethylene material, and can be used for preparing products such as polyethylene wires and cables, polyethylene foam boards, polyethylene pipes and the like.

The invention discloses a PE composite freshness protection package for preventing and controlling cold chain temperature loss and a preparation method and application thereof.The freshness protection package is a polyethylene film of a three-layer co-extrusion composite structure and sequentially comprises a heat insulation layer A, a gas adjusting layer B and a dehumidification layer C from outside to inside, the heat insulation layer A is formed by blending low-density polyethylene LDPE and heat insulation functional filler, and the gas adjusting layer B is formed by blending low-density polyethylene LDPE and heat insulation functional filler; the gas adjusting layer B is formed by blending linear low density polyethylene LLDPE and a gas adsorption adjusting functional filler; the dehumidification layer C is formed by blending low-density polyethylene (LDPE) and a moisture absorption functional filler; the preparation method of the PE composite fresh-keeping bag for preventing and controlling the cold chain temperature dropping damage comprises the following steps: (1) preparing the functional master batch; (2) three-layer co-extrusion film blowing; and (3) post-treatment. The invention further discloses application of the PE composite preservation bag in perishable fruit and vegetable packaging. The system has the advantages of active prevention and control, multifunctional cooperation, intelligent adjustment, processing technology advancement and reliability, safety, environmental protection and the like.

The invention discloses a polyolefin grafted maleic anhydride compatilizer and a preparation method thereof, the polyolefin grafted maleic anhydride compatilizer takes maleic anhydride as a grafting monomer, and the polyolefin grafted maleic anhydride compatilizer comprises the following raw materials: polyolefin, the grafting monomer and an initiator; the polyolefin is a polyolefin elastomer, high-density polyethylene, low-density polyethylene or linear low-density polyethylene. The polyolefin grafted maleic anhydride compatilizer can overcome the problem that the processing application range is limited due to low grafting rate and grafting efficiency in the prior art, and has the characteristics of high grafting rate and high grafting efficiency at the same time.

The invention relates to the technical field of high polymer materials, in particular to a pumice powder modification-based linear low-density polyethylene master batch and a preparation method thereof. The problem that an existing pumice powder modified polyethylene master batch is poor in aging resistance when being used for preparing a film is solved. The master batch disclosed by the invention is prepared from linear low-density polyethylene resin, pumice powder modified by KH-560 and a light stabilizer 944, activated nano zinc oxide, maleic anhydride grafted polyethylene, polydimethylsiloxane, a composite antioxidant and zinc stearate. During preparation, the modified pumice powder and the activated nano zinc oxide are prepared through hydrolytic condensation and loading processes, and then the linear low-density polyethylene master batch is obtained through high-speed premixing and twin-screw reaction extrusion granulation. Finally, a film prepared from the linear low-density polyethylene master batch has good aging resistance.

To provide a sealing sheet that has a desirable level of molding properties and heat resistance for use as a sealing sheet for solar cell modules. [Solution] A sealing sheet for solar cell modules, wherein the base resin is a polyolefin resin, the polyolefin resin is a linear low-density polyethylene resin composed of α-olefins having 4 or 6 carbon atoms, the α-olefin content is 12 to 13 mol%, the melting point is 45°C to 60°C, the temperature difference between the extracellular melting initiation temperature and the melting point is 11°C or less, and the resin component contains a crosslinking agent in a proportion of 0.1% to 1.2% by mass.

The application discloses a high-opening transparent polyethylene film, which is prepared from the following raw materials: 100 parts by mass of linear low-density polyethylene, 0.025-0.055 parts by mass of a compounded opening agent, 0.05-0.20 parts by mass of a slip agent and 0.05-0.20 parts by mass of an antioxidant; the compounded opening agent is compounded from silane-modified silicon dioxide, hydrated magnesium silicate and a cyclic olefin polymer, the mass ratio of the silicon dioxide, the hydrated magnesium silicate and the cyclic olefin polymer is 1:1:2-3:3:1, the slip agent is erucic acid amide, and the melt mass flow rate of the cyclic olefin polymer at 230 DEG C and under a load of 2.16KG is 3-10 g / 10min. By compounding the three opening agents, the amount of the silicon dioxide used is greatly reduced compared with the prior art.

Page 1 of 1 Summary of the invention. The current invention involves a composite polymer element. a) Bi- or multimodal LLDPE b) Compounds according to the following formula (I): chemical formula where Each group of R1, R2, R3, R4, R5, R6, R7, R8, R9, and R10 was selected independently from... Hydrogen and C1 to C10 groups, hydrocarbil; In this way, two groups from R3 to R10, located on adjacent carbon atoms, can be fused together. To form a cyclic hydrocarbilization structure; M was selected from a group consisting of calcium, strontium, lithium, zinc, magnesium, and... Monobasic aluminum; n is 1 or 2; z is 1 or 2; The sum of n+z is 3. Films made from such materials utilize polymer components that are bi- or multi-molecule. LLDPE, which is crystallized for agricultural film applications and the use of the compounds mentioned. The above is for increasing the spherical PAR transmittance of the film and / or reducing the F-scatter value. For use on films and / or for reducing film turbidity.

A plastic masterbatch is characterized by comprising the following components: linear low-density polyethylene, fluorocarbon-modified talc, polypyrrole-modified talc, a foaming agent, and a dispersant. The invention also discloses a method for preparing the plastic masterbatch. The addition of modified talc significantly improves the conductivity and wear resistance of the plastic masterbatch.

The invention discloses an environment-friendly film for a milk tea heat preservation bag and a preparation process of the environment-friendly film. In the invention, the inner functional adsorption layer adopts a partitioned design of a core adsorption area and an auxiliary adsorption area, the core area takes linear low-density polyethylene as a base material and is matched with high-proportion food-grade diatomite and modified activated carbon, and liquid and sugar generated during milk tea leakage can be quickly captured by utilizing porous structures and microporous adsorption capacities of the two; liquid is prevented from remaining on the film surface; in the auxiliary adsorption area, the flexibility of the film layer is improved through a proper amount of thermoplastic elastomer, meanwhile, dispersed trace liquid is subjected to secondary adsorption in cooperation with a small amount of adsorbent, and the outer barrier layer takes polyethylene glycol terephthalate as a main body and is supplemented with linear low-density polyethylene to enhance the interlayer binding force; the influence of external moisture and temperature change on the adsorption effect in the film can be blocked, the overall structural strength of the film material can be kept, deformation or damage caused by liquid adsorption is avoided, and the sticky feeling when the hand touches the film is fundamentally reduced.

The present application relates to the technical field of power cable, in particular to a double flame-retardant power cable for fire fighting and a preparation method thereof, which comprises a circular conductor, an insulation shielding layer, a metal layer, a metal armor layer and a polyethylene flame-retardant outer protective layer arranged from inside to outside; the polyethylene flame-retardant outer protective layer is prepared by mixing P / N / S / Si quaternary modified boron nitride flame retardant and linear low-density polyethylene in a mixing mill, heating and melting, and extruding; the preparation of the flame retardant comprises: preparing P / N / S / Si quaternary flame-retardant material by substitution reaction of P / N / S three flame-retardant element modified DOPO containing amine groups and bis(chloropropyl)tetramethyl disiloxane; obtaining P / N / S / Si quaternary modified boron nitride flame retardant by substitution reaction of Cl groups of P / N / S / Si quaternary flame-retardant material and hydroxylated boron nitride; the present application enables the power cable to maintain good flame retardancy under long-term humid heat aging conditions.

This invention discloses an antistatic and high-toughness plastic packaging film and its preparation method, belonging to the field of polymer composite materials technology. The packaging film uses linear low-density polyethylene as the matrix resin, compounded with carbon nanotubes modified by methanesulfonic acid activation, silane coupling agent KH-570 grafting, and PEG-PLA block copolymer, supplemented with antioxidants, lubricants, and tributyl citrate. In the preparation process, the carbon nanotubes are first mildly acidified and activated, and then modified with multiple components. The raw materials are then premixed, extruded using a twin-screw extruder, and formed using casting stretching or blown film processes. This invention solves the problem of carbon nanotube agglomeration through composite modification, improving its interfacial bonding with the matrix, and reducing the surface resistivity of the resulting packaging film to 4×10⁻⁶. 7 With an Ω·cm content, it combines excellent antistatic properties with high toughness, overcoming the shortcomings of traditional carbon nanotube modified packaging films where antistatic and mechanical properties are difficult to coordinate, and is suitable for packaging fields such as food and electronic components.

To provide a laminate and packaging bag capable of improving pinhole resistance. [Solution] The laminate forming the packaging bag comprises a first surface resin layer 11 formed using a multilayer film, an adhesive resin layer laminated on one side of the first surface resin layer 11 and made of low-density polyethylene, an intermediate layer laminated on the side of the adhesive resin layer opposite to the side facing the first surface resin layer 11 and made of nylon, and a second surface resin layer laminated on the side of the intermediate layer opposite to the side facing the adhesive resin layer and made of linear low-density polyethylene. The multilayer film forming the first surface resin layer 11 is a laminate formed by laminating an outer tough layer 20 and a core layer 23, which are tough layers with a density of a predetermined value or higher, and an outer flexible layer 21, an inner first flexible layer 25, and an inner second flexible layer 26, which are flexible layers with a density of less than a predetermined value.