69 results about "Medium-density polyethylene" patented technology

The invention 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 which are sequentially arranged, the inner layer is prepared from the following raw materials in parts by weight: 65 to 85 parts of low-density polyethylene, 20 to 30 parts of metallocene linear low-density polyethylene, 5 to 10 parts of ethylene-vinyl alcohol copolymer and 1 to 2 parts of nano zinc oxide; the surface layer is prepared from the following raw materials in parts by weight: 20 to 25 parts of low-density polyethylene, 60 to 70 parts of medium-density polyethylene, 8 to 12 parts of modified montmorillonite and 1 to 5 parts of sedum sarmentosum extract. The environment-friendly packaging material has better barrier property and antibacterial property, and also has excellent mechanical property.

The invention discloses a high-puncture-resistance polyethylene geomembrane as well as a production device and a production process thereof, and belongs to the technical field of geomembranes. The high-puncture-resistance polyethylene geomembrane comprises an upper-layer membrane, a first middle-layer membrane, an inner-layer membrane, a second middle-layer membrane and a lower-layer membrane from top to bottom, each of the upper-layer film and the lower-layer film comprises the following components in parts by weight: 90-100 parts of modified linear low-density polyethylene resin and 2-10 parts of double-resistance black master batch; each of the first middle-layer film and the second middle-layer film comprises 40-60 parts of medium-density polyethylene resin, 35-55 parts of metallocene high-density polyethylene resin and 2-10 parts of double-resistance black master batch; and the inner-layer film comprises 60-80 parts of medium-density polyethylene resin, 15-35 parts of linear low-density polyethylene resin and 2-10 parts of double-resistance black master batch. The polyethylene geomembrane is of a symmetrical five-layer membrane structure with the inner layer membrane as the center, the components of all the layers and the proportional relation between the components are specifically limited, the puncture resistance and the environmental stress cracking resistance of the polyethylene geomembrane are synchronously improved, and the requirements of severe environment anti-seepage engineering are met.

To provide a biaxially stretched polyethylene film with superior heat resistance.SOLUTION: A biaxially stretched polyethylene film includes a polyethylene layer containing at least one polyethylene selected from high-density polyethylene and medium-density polyethylene.SELECTED DRAWING: None

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.

To provide a gas barrier film which has excellent processing stability when a gas barrier layer is provided, and excellent heat resistance to maintain gas barrier property even after heat sterilization treatment.SOLUTION: A gas barrier film has a multilayer polyethylene film and a gas barrier layer, wherein the multilayer polyethylene film has at least three layers including a surface layer, an intermediate layer and a rear layer in this order, a probe drop temperature of the intermediate layer is higher than a probe drop temperature of the surface layer and equal to or higher than a probe drop temperature of the rear 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.SELECTED DRAWING: Figure 1

To provide a polyethylene multilayer substrate excellent in ink adhesion and manufacturability.SOLUTION: A polyethylene multilayer substrate includes a first layer including a medium-density polyethylene, a second layer including a medium-density polyethylene, a third layer including a medium-density polyethylene and a linear low-density polyethylene, a fourth layer including a medium-density polyethylene, and a fifth layer including a medium-density polyethylene, in this order in a thickness direction. A drawing treatment is applied to the polyethylene multilayer substrate.SELECTED DRAWING: Figure 1

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 high-density polyethylene and medium-density polyethylene; a second layer containing medium-density polyethylene; a third layer containing linear low-density polyethylene and medium-density polyethylene; a fourth layer containing medium-density polyethylene; and a fifth layer containing high-density polyethylene and medium-density polyethylene, in this order in a thickness direction. The polyethylene multilayer base material is processed with a drawing treatment.SELECTED DRAWING: Figure 1

To provide a laminate which has excellent recyclability, excellent processing stability when a gas barrier layer is provided, and excellent heat resistance to maintain gas barrier property and adhesion even after heat sterilization treatment.SOLUTION: A laminate has a multilayer polyethylene film, an inorganic oxide layer, an adhesive layer, and a sealant layer, wherein the multilayer polyethylene film has at least three layers including a surface layer, an intermediate layer and a rear layer in this order on the sealant layer side, a probe drop temperature of the intermediate layer is higher than a probe drop temperature of the surface layer and equal to or higher than a probe drop temperature of the rear 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 a content of the polyethylene resin in the laminate is 90 mass% or more based on the total amount of the laminate.SELECTED DRAWING: Figure 1

To provide a polyethylene-based stretched substrate with superior gas barrier properties.SOLUTION: A stretched substrate comprises at least a first surface resin layer primarily composed of gas barrier resin, one or more polyethylene intermediate layers primarily composed of polyethylene, and a second surface resin layer primarily composed of gas barrier resin, in the stated order. In at least one polyethylene intermediate layer, the polyethylene includes at least one polyethylene selected from high-density polyethylene and medium-density polyethylene, or has a density of more than 0.930 g / cm3 to 0.960 g / cm3 or less.SELECTED DRAWING: None

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 utility model discloses a floor heating pipe convenient to install, relates to the field of mechanical equipment, and solves the problems of high installation difficulty and long construction period of floor heating pipes in the current market. A floor heating pipe convenient to install comprises a floor heating pipe body, a connecting piece, a fixing piece and a sealing ring. According to the floor heating pipe, the medium-density polyethylene or high-density polyethylene and silane crosslinking or peroxide crosslinking method is adopted, so that the tensile strength, heat resistance, aging resistance, stress cracking resistance and dimensional stability of the floor heating pipe are improved; according to the utility model, the HNBR O-shaped sealing ring with the characteristics of corrosion resistance, wear resistance, tear resistance and compressive deformation resistance is adopted to realize the sealing between the floor heating pipe body and the connecting piece; according to the floor heating pipe, quick installation is achieved through the connecting pieces and the fixing pieces, the construction period is shortened, and installation efficiency is improved.

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

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.

To provide a laminate which has excellent processing stability when a gas barrier layer is provided, excellent transparency, excellent heat resistance to maintain gas barrier property even after heat sterilization treatment, and excellent adhesion.SOLUTION: A laminate has a multilayer polyethylene film, an inorganic oxide layer, an adhesive layer, and a sealant layer in this order, wherein the multilayer polyethylene film has a surface layer, an intermediate layer and a rear layer in this order, the surface layer is provided between the intermediate layer and the inorganic oxide 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, composite elastic moduli of the surface layer and the rear layer are 1.45 GPa or more and less than 1.90 GPa, a composite elastic modulus of the intermediate layer is 1.80 GPa or more and less than 2.50 GPa, and an absolute value of a molecular orientation degree of the multilayer polyethylene film is less than 1.07.SELECTED DRAWING: Figure 1

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.