40 results about "Medium-density polyethylene" patented technology

A polyethylene composition comprising a metallocene catalysed multimodal medium density polyethylene (mMDPE) and 0.5 to 5 weight % carbon black; wherein the metallocene catalysed multimodal medium density polyethylene (mMDPE) comprises: (i) 48 to 55 wt%, based on the total weight of the mMDPE, of a first polyethylene component (A), and (ii) 45 to 52 wt%, based on the total weight of the mMDPE, of a second polyethylene component (B), wherein the first polyethylene component (A) has a density (ISO 1183) in the range of from 950 to 980 kg / m3, and a MFR2 (190°C, 2.16 kg, ISO 1133) in the range of from 20 to 500 g / 10 min; the second polyethylene component (B) has a density (ISO 1183) in the range of from 900 to 925 kg / m3, and wherein the polyethylene composition has a density of 945 to 960 kg / m3; and a MFR5 (190°C, 5.0 kg, ISO 1133) in the range from 0.5 to 3.0 g / 10min.

The invention discloses a weather-resistant medium-density polyethylene cable sheath material and a preparation method thereof. The cable sheath material comprises the following raw materials in parts by weight: 45-55 parts of high-density polyethylene, 30-40 parts of linear low-density polyethylene, 3-5 parts of metal organic framework composite resin, 1-3 parts of a compatilizer, 0-2 parts of a high-molecular-weight hindered amine light stabilizer, 0.5-2 parts of a lubricant, 0.4-0.6 part of a nano inorganic screening agent, 0.3-0.6 part of an ultraviolet light absorber, 0.5-1.5 parts of calcium carbonate and 0-3 parts of a coloring agent. Wherein the nano inorganic screening agent is layered double hydroxide. The sheath material can adapt to environment and climate changes of different areas, the mechanical performance is guaranteed, meanwhile, the appearance and the main performance of a product are stable, the weather resistance is excellent, and the problems of sheath color spots, color fading, cracking and the like can be avoided.

This application relates to the field of insulating materials, specifically disclosing a flexural insulating material, its preparation method, and a robot cable, comprising the following raw materials in parts by weight: 50-80 parts of low-density polyethylene, 30-40 parts of medium-density polyethylene, 30-40 parts of ethylene-tetrafluoroethylene-perfluoropropyl vinyl ether terpolymer, 1-20 parts of filler, 3-8 parts of compatibilizer, 0.1-5 parts of crosslinking agent, and 0.1-5 parts of co-crosslinking agent. This invention addresses the performance shortcomings of existing insulating materials, achieving a balance of flexural resistance, abrasion resistance, insulation stability, and excellent flexibility, thus meeting the stringent requirements of high-frequency cables used in robots / manipulators.

This invention relates to the field of insulation materials technology, specifically to a high-strength, tear-resistant, halogen-free, flame-retardant insulating material and its preparation method. The high-strength, tear-resistant, halogen-free, flame-retardant insulating material comprises the following components by weight: 70-90 parts EPDM rubber, 5-15 parts thermoplastic elastomer, 15-25 parts medium-density polyethylene, 10-20 parts ethylene-vinyl acetate copolymer, 3-5 parts triallyl isocyanate, 2-4 parts sulfur, 1-3 parts polyethylene wax, 3-5 parts zinc oxide, 1-3 parts antioxidant, 30-50 parts aluminum hydroxide, 20-40 parts modified silica, 0.2-0.5 parts ultraviolet absorber, 1-3 parts accelerator, and 2-4 parts silicone masterbatch. The high-strength, tear-resistant, halogen-free, flame-retardant insulating material prepared by this invention exhibits excellent tensile and tear resistance and flame-retardant properties, thereby extending its service life.

This invention relates to the field of plastic multilayer film molding technology, and discloses a co-extrusion molding method for coated multilayer polyethylene film, comprising: melting and extruding high-density polyethylene resin and medium-density polyethylene resin and molding them into a multilayer polyethylene co-extruded melt film; attaching it to the surface of a cooling roller and controlling the cooling to form a multilayer polyethylene base film; activating its surface by bombarding with a corona bombardment device to form an activated surface layer; coating the activated surface layer with an amide-based slip emulsion to form a wet coating and drying it. This invention reconstructs the cooling crystallization kinetics of the co-extruded melt, inhibits the crystallization of high-density polyethylene, forms a metastable amorphous skin layer with high free volume in situ on the outer surface, provides a sensitive target area for introducing polar groups, inhibits the crystal phase shear deformation of the film under high temperature conditions, blocks stress concentration, and ensures that the film maintains morphological stability in a high-temperature cooking environment.

This invention provides a bimodal medium-density polyethylene (MDPE) composition and a micro-irrigation drip tape comprising the MDPE composition. The MDPE composition can be extruded at high linear velocity while maintaining other desired properties. The MDPE composition comprises a high molecular weight (HMW) polyethylene component and a low molecular weight (LMW) polyethylene component. The MDPE composition has a molecular weight of 0.937 g / cm³. 3 Up to 0.946 g / cm 3 Density; high-load melt index (I21) of 7 g / 10 min to 20 g / 10 min; cross G' = G” of 30 kPa to 50 kPa; notched constant tensile load failure time greater than 700 hours at 30% yield stress as measured according to ASTM D5397; and strain hardening modulus greater than 65 MPa.

The present disclosure relates to a specific metallocene-catalysed multimodal medium density polyethylene (mMDPE), use of the multimodal medium density polyethylene (mMDPE) in film applications and a fim including the mMDPE.

The application belongs to the technical field of packaging materials, and particularly relates to an environment-friendly packaging material and a preparation method thereof. The packaging material comprises an inner layer and a surface layer arranged in sequence; the inner layer comprises the following raw materials in parts by weight: low-density polyethylene 65-85 parts, metallocene linear low-density polyethylene 20-30 parts, ethylene-vinyl alcohol copolymer 5-10 parts, and nano-zinc oxide 1-2 parts; and the surface layer comprises the following raw materials in parts by weight: low-density polyethylene 20-25 parts, medium-density polyethylene 60-70 parts, modified montmorillonite 8-12 parts, and sedum aizoon extract 1-5 parts. The environment-friendly packaging material has good barrier property, antibacterial property, and excellent mechanical property.

This application discloses a high puncture-resistant polyethylene geomembrane and its production apparatus and process, belonging to the field of geomembrane technology. The high puncture-resistant polyethylene geomembrane comprises, from top to bottom, an upper membrane, a first middle membrane, an inner membrane, a second middle membrane, and a lower membrane. By weight, the upper and lower membranes each comprise 90-100 parts of modified linear low-density polyethylene resin and 2-10 parts of dual-resistant black masterbatch; the first and second middle membranes each comprise 40-60 parts of medium-density polyethylene resin, 35-55 parts of metallocene high-density polyethylene resin, and 2-10 parts of dual-resistant black masterbatch; the inner membrane comprises 60-80 parts of medium-density polyethylene resin, 15-35 parts of linear low-density polyethylene resin, and 2-10 parts of dual-resistant black masterbatch. This application describes a polyethylene geomembrane with a symmetrical five-layer structure centered on the inner membrane. It specifically defines the components of each layer and the proportional relationship between the components, thereby simultaneously improving the puncture resistance and environmental stress cracking resistance of the polyethylene geomembrane to meet the needs of seepage prevention projects in harsh environments.

The present invention relates to a paper or paperboard based packaging laminate comprising: a paper or paperboard base layer, a tie layer, a metallized film layer, and a heat-sealing layer, wherein the base layer has an inner side and an outer side, the metallized film layer is attached to the inner side of the base layer by the tie layer, and the heat-sealing layer is attached to the metallized film layer, wherein the tie layer and the heat-sealing layer are formed of a polyethylene independently selected from the group consisting of a low-density polyethylene (LORE), a linear low-density polyethylene (LLDPE), a polyethylene ionomer, a polyethylene plastomer and combinations thereof, and wherein the metallized film layer comprises a metallization layer formed on a substrate film comprising a polyethylene selected from the group consisting of medium-density polyethylene (MOPE), high-density polyethylene (HOPE) and combinations thereof.

The gas barrier film is provided with a multilayer polyethylene film and a gas barrier layer, the multilayer polyethylene film has a surface layer, an intermediate layer, and an inner layer in this order, the surface layer is provided between the intermediate layer and the gas barrier layer, and the surface layer is composed of a medium-density polyethylene resin or a high-density polyethylene resin having a density of 0.926 g / cm3 or more. The composite elastic modulus of the surface layer and the inner layer is 1.45 GPa or more and less than 1.90 GPa, the composite elastic modulus of the intermediate layer is 1.80 GPa or more and less than 2.50 GPa, the ratio of the thickness of the intermediate layer to the total thickness of the surface layer and the inner layer is 0.5 or more, the temperature indicated by the maximum value of the melting peak of the multilayer polyethylene film exceeds 129 DEG C and less than 136 DEG C, and the thickness of the intermediate layer is 0.5 or more. The gas barrier layer has at least one of an inorganic oxide layer and a gas barrier coating layer.

The present invention relates to the technical field of composite films, and provides a PE light-sealing film and a preparation method thereof, as well as a light-sealing packaging bag composite film. The present invention uses low-density polyethylene and linear low-density polyethylene to blend in the outer layer, which has the characteristics of good processing performance and high composite strength; the middle layer uses medium-density polyethylene and metallocene low-density polyethylene to blend, which has the characteristics of high strength, good stiffness and easy processing; polyolefin-modified α-olefin copolymer is added to the inner layer, and the polyolefin-modified α-olefin copolymer is blended with polyolefin as a modifier, which can achieve the effect of controlling the heat-sealing strength of the film and realize the light-sealing function. The PE light-sealing film of the present invention is used to prepare a light-sealing packaging bag composite film, and the obtained composite film has the characteristics of low heat-sealing strength, easy to tear the seal, no drawing, and no residue, and can be used for the packaging of common daily necessities such as nuts, milk powder and cosmetics.

Metallocene-catalyzed multimodal medium-density polyethylene (mMDPE), the use of said multimodal medium-density polyethylene (mMDPE) in membrane applications, and membranes comprising the mMDPE of the present invention.

Embodiments of multilayer films are disclosed comprising a first layer comprising polyethylene, a second layer comprising a first medium density polyethylene; a barrier layer; a third layer comprising a second medium density polyethylene; and a fourth layer comprising polyethylene. The second layer may be positioned between the first layer and the barrier layer. The barrier layer may be positioned between the second layer and the third layer.

The application provides a food packaging recycled film regenerated geomembrane and a preparation method thereof. The food packaging recycled film regenerated geomembrane comprises an outermost layer, an intermediate layer and an innermost layer arranged in sequence. The outermost layer and the innermost layer are symmetrically distributed with the intermediate layer as an axis. The outermost layer and the innermost layer comprise, by weight percentage, 85.0-95.0% of high-density polyethylene, 1.0-10.0% of medium-density polyethylene, 1.0-5.0% of a first compatilizer and 0.5-2.0% of silane modified montmorillonite. The intermediate layer comprises 75.0-93.0% of food packaging recycled film, 5.0-20.0% of a second compatilizer and 2.0-8.0% of ethylene-vinyl acetate copolymer. On the basis of the silane modified montmorillonite, the PA and PET in the food packaging recycled film can improve the mechanical properties such as stiffness and strength of the geomembrane. Thus, the geomembrane has good performance in all aspects and can be used as a replacement product of the virgin geomembrane.

To provide a polyethylene multilayer substrate excellent in ink adhesion and interlaminar strength.SOLUTION: A polyethylene multilayer substrate is provided with a layer (A) containing medium-density polyethylene, two or more multilayer medium layers (B) each containing polyethylene, and a layer (C) containing medium density polyethylene in this order in a thickness direction, wherein the multilayer substrate is subjected to drawing treatment, and an absolute value of a difference between a density of polyethylene constituting a layer (1) and a density of polyethylene constituting a layer (2) is 0.030 g / cm3 or less when arbitrary polyethylene-containing layers adjacent to each other in the thickness direction in the multilayer substrate are described as the layer (1) and the layer (2).SELECTED DRAWING: Figure 1

A gas barrier film includes a multilayer polyethylene film and a gas barrier layer, in which the multilayer polyethylene film includes at least three layers of a front layer, an intermediate layer, and a rear layer in this order on the gas barrier layer side; the intermediate layer has a probe descent temperature which is higher than that of the front layer and is higher than or equal to that of the rear layer; the front layer is constituted of a medium-density polyethylene resin having a density of 0.926 g / cm3 or more, or a high-density polyethylene resin; and the gas barrier layer includes at least either of an inorganic oxide layer and a gas barrier coating layer.

This gas barrier film is provided with a multilayer polyethylene film and a gas barrier layer, the multilayer polyethylene film having at least a surface layer, an intermediate layer, and a rear surface layer in this order on the gas barrier layer side, and the probe drop temperature of the intermediate layer is higher than the probe drop temperature of the surface layer and is equal to or higher than the probe drop temperature of the rear surface layer. The surface layer is composed of a medium-density polyethylene resin or a high-density polyethylene resin having a density of 0.926 g / cm3 or more, and the gas barrier layer has at least one of an inorganic oxide layer and a gas barrier coating layer.

A metallocene-catalysed multimodal medium density polyethylene (mMDPE) is disclosed, with films and methods of use of the multimodal medium density polyethylene (mMDPE) in film applications, and a film including the mMDPE.

The application provides a high-temperature anti-fog film, a preparation method and a packaging bag. The film comprises an outer layer base film, a middle layer base film and an inner layer base film which are tightly attached from outside to inside. The outer layer base film comprises 20% by weight of a first low-density polyethylene, 50% by weight of a metallocene linear polyethylene, 29% by weight of a linear low-density polyethylene and 1% by weight of an anti-fog agent. The middle layer base film comprises 30% by weight of a medium-density polyethylene and 70% by weight of a metallocene linear polyethylene. The inner layer base film comprises 30% by weight of a second low-density polyethylene, 69% by weight of a metallocene linear low-density polyethylene and 1% by weight of an anti-fog agent. The high-temperature anti-fog film prepared by the above components and process has good high-temperature anti-fog performance on the inner and outer layers. The inner layer base film prepared by blending the second low-density polyethylene and the metallocene linear low-density polyethylene has a smooth surface and high toughness, and can ensure that water droplets automatically slide on the film surface even under internal pressure.

A composition is disclosed which includes a metallocene catalysed medium density polyethylene (MDPE) and a mixed-plastic-polyethylene recycling blend, with films and methods of use of the composition in film applications and films including the polymer composition.

The invention provides a waterproof material as well as a preparation method and application thereof, and belongs to the field of tunnels. The invention provides a waterproof material, which is prepared from the following raw materials in parts by mass: 20 to 40 parts of linear low density polyethylene; 40 to 50 parts of polypropylene; 10-20 parts of a thermoplastic polyester elastomer; 10 to 15 parts of polyolefin elastomer; 15 to 25 parts of medium density polyethylene; and 2-5 parts of an antioxidant. The temperature resistance of the waterproof material is improved by adjusting the components and dosage of the raw materials in the waterproof material.

This application relates to the field of thin film technology, and specifically discloses a blow-molded PE film with ultra-high gloss and ultra-low haze and its preparation process. The blow-molded PE film with ultra-high gloss and ultra-low haze successively includes an outer layer, a middle layer and an inner layer from outside to inside; the inner layer is made of the following raw materials: metallocene linear low density polyethylene, metallocene linear ultra-low density polyethylene, low density polyethylene, metallocene polyethylene, antiblocking agent, slip agent, PPA additive; the middle layer is made of the following raw materials: high density polyethylene, metallocene linear medium density polyethylene, polypropylene, PPA additive, nucleating agent; the outer layer is made of the following raw materials: metallocene linear low density polyethylene, metallocene linear ultra-low density polyethylene, low density polyethylene, metallocene polyethylene, PPA additive. The blow-molded PE film with ultra-high gloss and ultra-low haze of this application has the advantages of high gloss, low haze, excellent mechanical properties and strong barrier properties.

The invention relates to the technical field of photovoltaic cables, in particular to a multi-layer composite photovoltaic cable and a preparation method thereof. The photovoltaic cable comprises photovoltaic conductors which are sequentially arranged from inside to outside. The first fireproof layer wraps the outer side of the photovoltaic conductor and is formed by overlapping and wrapping a double-sided synthetic mica tape; the insulating layer coats the outer side of the first fireproof layer; the second fireproof layer coats the outer side of the insulating layer; the waterproof lining layer wraps the outer side of the second fireproof layer and is made of medium-density polyethylene; the liner layer wraps the outer side of the water-blocking lining layer and comprises a layered structure formed by wrapping a flame-retardant glass fiber tape; and the sheath layer coats the outer side of the liner layer. The photovoltaic cable provided by the invention has the advantages of fire prevention, water resistance, rat and ant prevention, long time efficiency, high environmental protection performance and the like, can stably operate in a fire or humid environment, and is beneficial to popularization and application of field laying.

This invention provides a halogen-free flame-retardant waterproof layer, a halogen-free flame-retardant waterproof membrane, and a method for preparing the same, belonging to the field of waterproof membranes and flame-retardant materials. The halogen-free flame-retardant waterproof layer comprises, by weight, 10-30 parts high-density polyethylene resin, 20-60 parts medium-density polyethylene resin, 0-10 parts linear low-density polyethylene resin, 5-20 parts ethylene-vinyl acetate copolymer resin, 5-10 parts ethylene-acrylic acid copolymer compatibilizer, 5-50 parts condensed-phase halogen-free flame retardant, 0.1-3 parts polyether block amide elastomer antistatic agent, 0.1-3 parts rare earth coupling agent, 0.1-1.5 parts dispersant, 0.1-1.5 parts antioxidant, and 0.1-1.5 parts light stabilizer; wherein the condensed-phase halogen-free flame retardant is selected from at least one of phosphorus-based flame retardants, phosphorus-nitrogen intumescent flame retardants, and silicon-based flame retardants. The waterproof membrane has a multi-layered structure, including a strong flame-retardant waterproof layer and a non-flame-retardant or weak flame-retardant waterproof layer, with the strong flame-retardant waterproof layer and the non-flame-retardant and / or weak flame-retardant waterproof layer being distributed alternately.

The invention relates to a nylon and medium density polyethylene composite flame-retardant inner sheath for a photovoltaic cable, which relates to the technical field of cable sheaths and comprises an inner layer, a first connecting layer, a middle layer, a second connecting layer and an outer layer. The composite material has the effects of high flame retardance and high mechanical property. The outer side of the inner layer is connected with the middle layer through the first connecting layer, the inner layer can provide high strength and wear resistance, provide structural support for the inner sheath, mechanically protect the cable and resist friction and bending stress during installation, and the middle layer can achieve the protection effect, resist external extrusion and serve as a flame-retardant carrier. And the mechanical strength and the flame-retardant effect of the inner sheath can be effectively improved, so that the protection effect on a cable line is improved, and the use requirements are met.

The invention provides a halogen-free flame-retardant waterproof layer, a halogen-free flame-retardant waterproof board and a preparation method of the halogen-free flame-retardant waterproof board, and belongs to the field of waterproof boards and flame-retardant materials. The invention discloses a halogen-free flame-retardant waterproof layer. The high-density polyethylene composite material comprises the following components in parts by weight: 10-30 parts of high-density polyethylene resin, 20-60 parts of medium-density polyethylene resin, 0-10 parts of linear low-density polyethylene resin, 5-20 parts of ethylene-vinyl acetate copolymer resin, 5-10 parts of an ethylene-acrylic copolymer compatilizer, 5-50 parts of a condensed-phase halogen-free flame retardant and 0.1-3 parts of a polyether block amide elastomer antistatic agent, 0.1-3 parts of a rare earth coupling agent, 0.1-1.5 parts of a dispersing agent, 0.1-1.5 parts of an antioxidant and 0.1-1.5 parts of a light stabilizer; wherein the condensed-phase halogen-free flame retardant is selected from at least one of a phosphorus-based flame retardant, a phosphorus-nitrogen intumescent flame retardant and a silicon-based flame retardant. The waterproof board is of a multi-layer laminated structure and comprises a strong flame-retardant waterproof layer and a non-flame-retardant waterproof layer or a weak flame-retardant waterproof layer, and the strong flame-retardant waterproof layer and the non-flame-retardant waterproof layer and / or the weak flame-retardant waterproof layer are distributed at intervals.

To provide a polyethylene multilayer base material excellent in ink adhesion and heat resistance.SOLUTION: A polyethylene multilayer base material includes: a first layer containing medium-density polyethylene and high-density polyethylene; a second layer containing medium-density polyethylene and linear low-density polyethylene; a third layer containing linear low-density polyethylene; a fourth layer containing medium-density polyethylene and linear low-density polyethylene; and a fifth layer containing medium-density polyethylene and high-density polyethylene, in this order in a thickness direction. The polyethylene multilayer base material is processed with a drawing treatment.SELECTED DRAWING: Figure 1

An intelligent mooring cable for an ocean wind power platform is mainly composed of a mooring cable body and cable connectors. The mooring cable body is formed by wrapping a medium-density polyethylene protective layer on a single-strand steel wire rope with the structure of 1 * 626, and the single-strand steel wire rope is formed by twisting a fiber bragg grating sensor for measuring stress and strain and 625 high-strength zinc-plated aluminum rare earth alloy steel wires, wherein the fiber bragg grating sensor is located in the dead center and used for measuring stress and strain. A sensor of the mooring cable body is connected with a submarine cable lead and is subjected to protective casting, and the intelligent mooring cable is manufactured after cooling. Full-time and full-domain stress-strain monitoring of the mooring cable for the ocean wind power platform can be achieved, intelligent development of the ocean engineering mooring field is promoted, the blank of the field is filled up, and the method has high application and prospects.

The application discloses a heat-shrinkable tube and a preparation method and application thereof. The heat-shrinkable tube comprises the following components in parts by weight: 40-60 parts of high-density polyethylene, 20-40 parts of medium-density polyethylene, 10-20 parts of elastomer and 0.1-0.5 parts of antioxidant. The heat-shrinkable tube provided by the application is excellent in rigidity and shrinkability and is non-toxic and harmless.