381 results about "Polyethylene membrane" patented technology

A multi-layer, microporous polyethylene membrane having at least three layers comprising (a) a first microporous layer amount of a polyethylene resin and constituting at least both surface layers, and (b) at least one second microporous layer made of a polyethylene resin, a heat-resistant resin having a melting point or glass transition temperature of 150°C or higher and a filler, and sandwiched by both surface layers.

The invention relates to the technical field of high molecular material, in particular to a light weight polyethylene film. In order to solve the technical problem, the invention discloses the light weight polyethylene film which is prepared through the following raw materials by weight portion: 2 to 50 portions of polyethylene film composite parent material, and 50 to 98 portions of polyethylene, wherein the polyethylene film composite parent material is prepared through the following raw materials by weight portion: 80 to 100 portions of filler, 5 to 25 portions of polyolefin, 10 to 15 portions of poly-modifier, 11 to 15 portions of fatty acid, 2 to 8 portions of mineral oil, 2 to 3 portions of coupling agent, and 0.1 to 0.08 portions of crosslinking agent. The specific gravity of the light weight polyethylene film is between 0.8 and 0.95g / cm. The key physical properties of the light weight polyethylene film are not reduced while the cost of the finished product film is reduced simultaneously. The fracture elongation rate is more than or equal to 150 percent; the tensile property is more than or equal to 25MPa; and the thermal sealing strength is more than or equal to 6.0.

A microporous polyethylene membrane having well-balanced permeability, mechanical properties, heat shrinkage resistance, compression resistance, electrolytic solution absorbability, shutdown properties and meltdown properties, with an average pore diameter changing in a thickness direction is produced by melt-blending a polyethylene resin and a membrane-forming solvent to prepare a solution A having a resin concentration of 25 to 50% by mass and a solution B having a resin concentration of 10 to 30% by mass, the resin concentration in the solution A being higher than that in the solution B, (a) simultaneously extruding the resin solutions A and B through a die, cooling the resultant extrudate to provide a gel-like sheet in which the resin solutions A and B are laminated, and removing the membrane-forming solvent from the gel-like sheet, or (b) extruding the resin solutions A and B through separate dies, removing the membrane-forming solvent from the resultant gel-like sheets A and B to form microporous polyethylene membranes A and B, and alternately laminating the microporous polyethylene membranes A and B, while easily controlling the average pore diameter distribution in the microporous polyethylene membrane in a thickness direction.

PROBLEM TO BE SOLVED: To provide a microporous polyethylene membrane exhibiting little change in thickness and air permeability during compression and having a rapid electrolyte-absorption rate, and to provide its production method and a battery separator formed by such microporous polyethylene membrane.SOLUTION: The microporous polyethylene membrane is made of a polyethylene resin comprising ≤15 mass% of ultra-high molecular weight polyethylene having a mass-average molecular weight of ≥1 x 10<SP POS="POST">6< / SP>. The microporous polyethylene membrane is a single film that has a densely-structured layer comprising an average pore diameter of 0.01-0.05 μm and a coarsely-structured layer having an average pore diameter larger by 1.2-5.0 times than that of the densely-structured layer, both structured layers being adjacent to each other in a thickness direction, wherein a coarsely-structured layer is formed at least on one surface.

The invention relates to the technical field of high molecular material, in particular to a polyethylene film composite parent material. The invention discloses the polyethylene film composite parent material which is prepared through the following raw materials by weight portion: 80 to 100 portions of filler, 5 to 25 portions of polyolefin, 10 to 15 portions of poly-modifier, 11 to 15 portions of fatty acid, 2 to 8 portions of mineral oil, 2 to 3 portions of coupling agent, and 0.1 to 0.08 portion of crosslinking agent. The specific gravity of the light weight polyethylene film prepared from the polyethylene film composite parent material is between 0.8 and 0.95g / cm<3>. The key physical properties of the light weight polyethylene film are not reduced while the cost of the finished product film is reduced simultaneously. The fracture elongation rate is more than or equal to 150 percent; the tensile property is more than or equal to 25MPa; and the thermal sealing strength is more than or equal to 6.0.

A polyethylene microporous film which is composed of a linear copolymeric polyethylene having a melt index (MI) of less than 0.1 and a propylene unit content of 0.1 to 4 mol % and which has a fuse temperature of less than 136° C. A polyethylene microporous film which is composed of a mixture of a linear copolymeric polyethylene having a melt index (MI) of less than 0.1 and a propylene unit content of 0.1 to 4 mol % and a high density polyethylene having a comonomer unit content of less than 0.1 mol %, said mixture having a weight average molecular weight of 250,000 to 700,000 and a propylene unit content of 0.1 to 4 mol %, and which has a fuse temperature of less than 136° C.

The invention relates to an antifogging agent composition and a transparent antifogging window membrane formed from the composition. The antifogging agent composition consists of 9-14wt% of hydrophilic resin, 55-76wt% of propylene glycol methyl ether, 3-10wt% of dimethyl methylamine, 1-5wt% of triethylenediamine, 1-5wt% of a levelling agent, 5-26wt% of isopropanol, and 5-24wt% of ethanol. The antifogging window membrane is composed of an antifogging agent coating (1), a transparent polyester membrane or transparent polyethylene membrane base material (2), an acrylic adhesive layer (3) and a release membrane (4), and all layers are integrated. The antifogging agent coating (1) is formed by the antifogging agent composition, while the acrylic adhesive layer (3) is formed by a mixture of an acrylic adhesive, a curing agent, toluene and butanone. The transparent antifogging window membrane has effective antifogging function and high light transmittance, as well as a protection effect.

The invention relates to a tear-resistant polyethylene film, a composite membrane and a preparation method thereof. The polyethylene film comprises a corona layer, a middle layer and a heat sealing layer, wherein the corona layer and the middle layer are each composed of first metallocene PE, octa-carbon LLDPE and processing aids, and the heat sealing layer is composed of the first metallocene PE, second metallocene PE, silicone, a slipping agent and an opening agent. The composite membrane is formed by a PET printing membrane layer, a first extruded PE membrane layer, an aluminum foil layer, a second extruded PE membrane layer and a polyethylene membrane layer which are sequentially fitted in the membrane layer thickness direction; the extruded PE membrane layer comprises a first adhesive layer in fit with the aluminum foil layer and a second adhesive layer in fit with the PET printing membrane layer or the polyethylene membrane layer, wherein the first adhesive layer is composed of third metallocene PE and adhesive resin, and the second adhesive layer is composed of the third metallocene PE and color master batch. The polyethylene film and the composite membrane disclosed by the invention have higher tear resistance strength. In addition, the composite membrane has excellent humidity resistance property.

A microporous polyethylene membrane made of a polyethylene resin having a ratio (mass-average molecular weight / number-average molecular weight) of 5 to 300 and comprising 1% or more by mass of ultra-high-molecular-weight polyethylene having a mass-average molecular weight of 7×105 or more, the microporous polyethylene membrane comprising (a) a coarse-structure layer having an average pore diameter of more than 0.04 μm, which is formed on at least one surface, and (b) a dense-structure layer having an average pore diameter of 0.04 μm or less, an area ratio of the coarse-structure layer to the dense-structure layer in a membrane cross section being 0.1 to 0.8.

The invention discloses a modified asphalt waterproof coiled material, which comprises a base layer B, an upper surface layer A bonded to the base layer B, and a lower surface layer C bonded under the base layer B, wherein the upper surface layer A and the base layer B are , and the base layer B and the lower surface layer C are bonded with each other by elastomer modified asphalt, the base layer B is made of glass fiber film, the upper surface layer A is made of polyethylene film, high temperature resistant polyester film or fine sand, and the lower layer The surface layer C is made of polyethylene film; the elastomer modified asphalt is prepared according to the following steps: after carbon nanotubes are hydroxylated, then acidified to obtain the second material; MAH-g-SBS is mixed with the second material and then ultrasonically Disperse and age to obtain carbon nanotube-modified SBS; after heating the asphalt, add carbon nanotube-modified SBS, nano-zinc oxide and other materials in sequence, and continue to heat up to obtain a mixed material; after the mixed material is oxidized and polished, then add talc powder to obtain elastomer-modified asphalt.

The invention relates to a polymer lithium ion battery and a preparation method thereof. The polymer lithium ion battery is manufactured by that anode and cathode pole pieces manufactured by the Bellcore technology and a diaphragm are overlaid into a battery cell, and then the battery cell is extracted, welded, packaged and reduced. The active material of the anode pole piece is LiCoO2 of which the D50 is 5-10mu m; the active material of the cathode pole piece is graphite; the diaphragm is a polyethylene film made with a dry method; and high-temperature and low-temperature electrolyte is prepared by evenly mixing electrolyte salt, organic solvent and additive. In the preparation method, the anode and cathode pole pieces and the diaphragm are overlaid into the battery cell; the battery cell is put in a flexible package film after being extracted, welded and packaged; the three edges of the flexible package film are sealed; the high-temperature and low-temperature electrolyte is injected into the battery cell; the fourth edge of the film is sealed in a vacuum packaging mode; and the reduction technology is carried out. Compared with the prior art, the preparation method has the characteristic that the low-temperature discharging performance of the battery is realized.

The invention provides a dowel bar with a combined structure for cement concrete pavements. The dowel bar consists of a steel dowel bar, a glass steel sleeve tube and polyethylene films, wherein the inner wall of the glass steel sleeve tube is smooth, the outer surface consists of two parts, rib-shaped threads are formed in one side and firmly connected with the edge of a cement concrete plate, and the outer surface of the other side is smooth, so that the dowel bar can freely extend in adjacent grooves of the cement concrete plate. Threads are formed in one end of the steel dowel bar, one end of the steel dowel bar is tightly connected with the edge of the cement concrete plate, the outer surfaces of the other parts are smooth, the surfaces are painted and wrapped with the polyethylene films, and the bar end extends into the grooves in the edge of the cement concrete plate and can freely extend in the grooves of the cement concrete plate. The dowel bar with the combined structure has the advantages of good shearing resisting property and good corrosion resistance; besides, the stress of the contact surface with the cement concrete is uniform, the failure of the dowel bar caused by the breaking because of the cracking of the edge of the cement concrete plate is avoided, and prolonging the service life of the cement concrete pavements is benefited.