205results about How to "Good heat shrinkability" patented technology

A heat-shrinkable laminated film having: (A) layer mainly having a polyester series resin; (C) layer mainly having a polystyrene series resin or mixture of polyester series and polystyrene series resins; and (B) layer mainly having polyester series and polystyrene series resins and disposed between (A) and (C) layers, the film having excellent heat-shrinkability, transparency, and interlayer-adhesiveness at room temperature, not easily peeled in a high-temperature treatment, inhibited from whitening when bent during processing, and suitable for shrinkage-packaging, shrink-bond-packaging, etc., with (B) layer having: a hard polyester series resin or mixture of hard polyester series and soft polyester series resins; and soft styrene series resin, hard styrene series resin, or mixture thereof, or with a content of the (B) layer polyester series resin smaller than that of the (A) layer one, and a content of the (C) layer polyester series resin smaller than that of the (B) layer one.

The invention discloses a lithium supplement composite diaphragm, a preparation method and application, and belongs to the technical field of a lithium secondary battery. According to the lithium supplement composite diaphragm, a ceramic layer and a ceramic-lithium supplement layer are arranged at two sides of a base diaphragm; on the one hand, the temperature resistance of the diaphragm is improved, the heat shrinkable property of the diaphragm is improved, and the occurrence of short circuit accidents is reduced; and on the other hand, the Lithium ions consumed in the charge / discharge process can be timely supplemented, the ion transport speed is improved, and the structure stability in the circulation process of the lithium battery is improved. According to the lithium supplement composite diaphragm, the preparation method and the application, the lithium supplement layer is arranged on the surface of the ceramic layer, potential safety hazards resulting from micropore blocking due to the fact that metal lithium powder directly contacts the base diaphragm can be avoided, moreover, the ceramic layer plays a role in buffering and heat dissipation, and the security of the lithium powder in the use process is improved. Netty current collectors are employed in the lithium battery, and the lithium ions can pass through an anode sheet and a cathode pole rapidly, and a high speed channel is provided to supplement the lithium ions timely.

The invention relates to a polyolefin microporous diaphragm and a manufacture method thereof, which belongs to the field of thin-film manufacture. The polyolefin microporous diaphragm consists of a polyolefin microporous basal membraneand oxide layer(s) on or / and under the polyolefin microporous basal membrane, wherein the polyolefin microporous basal membrane consists of 96.5 to 99.995 percent of homo-polypropylene resin and 0.005 to 3.5 percent of beta crystal form nucleating agent according to weight percentage; the polyolefin microporous basal membrane has the average pore size between 80 and 200 nanometers, the porosity between 30 and 50 percent and the air permeability between 1.5 and 15 ml / cm<2>.sec.atm; and the thickness of the oxide layer is between 0.05 and 2 microns. The polyolefin microporous diaphragm has the characteristics of uniform micropores, good air permeability, good thermal shrinkage properties and high ionic electrical conductivity, and can be widely applied to medical dialysis membranes, industrial water treatment membranes and lithium-ion secondary battery diaphragms.

An object of the present invention is to provide a shrinkable film excellent in dimensional stability at a temperature of 60° C. and having good shrink properties in a temperature of 100° C. and 120° C. A low-temperature shrinkable film includes a film composed of at least one layer including at least one ethylene-α-olefin copolymer (A) with a density of from 0.870 g / cm3 to 0.920 g / cm3 and at least one ethylenic copolymer (B) having a main peak below 110° C. in the 2nd fusion behavior of differential scanning calorimetry, wherein the proportion of the heat of fusion at 100° C. or below to the total heat of fusion is from 50% to 100% in the 2nd fusion behavior of differential scanning calorimetry for ethylene-α-olefin copolymer (A); the proportion of the heat of fusion at 100° C. or below to the total heat of fusion is from 60% to 100% in the 2nd fusion behavior of differential scanning calorimetry for the film; and the average value of a heat shrinkage percentage in the longitudinal direction and a heat shrinkage percentage in the lateral direction of the film is from 0 to 15% at 60° C., 50% or greater at 100° C. and 70% or greater at 120° C.

The present invention provides a polyolefin series heat-shrinkable film comprising a mixed resin mainly containing a polyolefin series resin (A), polylactic acid series resin (B), and a resin (C) facilitating compatibility with the resin (A) and the resin (B), or comprising at least one layer made of the mixed resin, wherein mass ratio of the resin (A) to the resin (B) is (A) / (B)=99 / 1 to 70 / 30; heat shrinkage ratio of the film at least in one direction when dipped in hot water at 80° C. for 10 seconds is 20% or more; and natural shrinkage ratio of the film when stored at 40° C. under 50% RH environment for 7 days is less than 10%. This polyolefin series heat-shrinkable film exhibits excellent heat-shrinkable property and shrink finishing quality, and inhibits natural shrinkage. This invention also provides a polyolefin series heat-shrinkable label and container on which the heat-shrinkable label is fitted.

The invention discloses a biaxially-oriented polypropylene (BOPP) thin film of a hard-box cigarette package special for a super-high speed cigarette packer. The thin film adopts a way of directly co-extruding and compositing a three-layer structure, wherein the upper surface structure of the thin film is mainly made from polypropylene copolymer; the core structure of the thin film is mainly made from polypropylene homopolymer; and the lower surface structure of the thin film is mainly made from polypropylene copolymer. In the BOPP thin film disclosed by the invention, excellent optical performance, smoothness and thermal shrinkage are kept; the stiffness is good; the elastic modulus is high; the thickness is uniform; the surface of the film has certain wear resisting property; and the film can be applicable to a super-high speed cigarette packer set and effectively solves the technical problem that an ordinary hard-box cigarette package thin film cannot be matched with the packer set to be used.

The invention provides a preparation method of a porous composite isolating membrane. The preparation method comprises the following steps: (1) moulding technology of the porous composite isolating membrane: preparing a porous isolating membrane basic material from organic particles; (2) coating technology of a functional material coating: coating a functional material on at least one surface of the porous isolating membrane basic material so as to obtain a porous isolating membrane basic material with a functional material coating; (3) thermal treatment technology: drying the functional material coating, ad carrying out a thermal treatment on the porous isolating membrane basic material and the functional material coating so as to obtain the porous composite isolating membrane. The provided preparation method can prepare a porous composite isolating membrane with an excellent performance, and has the advantages of high efficiency and low cost. The prepared porous composite isolating membrane has the advantages of high pore rate, good breathability, high binding performance, high mechanical strength, and high thermal stability.

The present invention provides a polyolefin series heat-shrinkable film comprising a mixed resin mainly containing a polyolefin series resin (A), polylactic acid series resin (B), and a resin (C) facilitating compatibility with the resin (A) and the resin (B), or comprising at least one layer made of the mixed resin, wherein mass ratio of the resin (A) to the resin (B) is (A) / (B)=99 / 1 to 70 / 30; heat shrinkage ratio of the film at least in one direction when dipped in hot water at 80° C. for 10 seconds is 20% or more; and natural shrinkage ratio of the film when stored at 40° C. under 50% RH environment for 7 days is less than 10%. This polyolefin series heat-shrinkable film exhibits excellent heat-shrinkable property and shrink finishing quality, and inhibits natural shrinkage. This invention also provides a polyolefin series heat-shrinkable label and container on which the heat-shrinkable label is fitted.

The present invention reveals one kind of heat shrinking polyester film prepared with one kind of modified copolyester. The modified copolyester is polymer of one composition comprising terephthalic acid, ethylene glycol, and one first modifier for destroying crystallinity. The modified copolyester has glass transition temperature within 40-85 deg.c. The first modifier is 1, 3-dihydroxy-2-methyl propane, 1, 3- dihydroxy-2- methyl propane alkoxy ester and / or 2, 5-dimethyl-2, 5-hexadiol. The present invention also reveals process of preparing the heat shrinking polyester film with sheet of the modified copolyester and through stretching, cooling and curing.

The invention provides a composite diaphragm with a lithium supplementing effect. The composite diaphragm comprises a base membrane, a first ceramic coating and a second ceramic coating which are respectively positioned on the upper surface and the lower surface of the base membrane, a lithium supplementing gel coating positioned on the upper surface of the first ceramic coating, and a gel coatingpositioned on the lower surface of the second ceramic coating. According to the invention, with the ceramic coating in the diaphragm, the temperature resistance of the diaphragm is improved, the thermal shrinkage of the diaphragm is improved, explosion caused by short circuit due to direct contact between a positive electrode and a negative electrode due to diaphragm deformation caused by thermalcontraction of the diaphragm at a high temperature is prevented, the lithium supplementing gel coating can realize uniform and accurate lithium supplementing of a silicon-carbon negative electrode sheet, a silicon-carbon negative electrode is prevented from being excessively lithiated to cause lithium precipitation, after lithium supplementing is finished, the gel coating and the electrode sheethave higher bonding force under the action of hot-pressing shaping, and the lithium ion good conductor powder remained in the lithium supplementing coating has good ionic conductivity, so that the conduction of lithium ions is promoted.

The invention discloses mixed slurry for preparing a composite diaphragm. The mixed slurry is prepared from components in percentage by mass as follows: 5%-45% of nano-glue, 5%-45% of attapulgite nano-ceramic fiber, 1.5%-5% of a binder, 0.5%-1.5% of a dispersant, 0.1%-0.5% of a surfactant and the balance of a solvent. The invention further discloses a preparation method of the composite diaphragm.

The invention relates to the technical field of a heat shrinkable polyester film, and particularly relates to a heat shrinkable polyester film and a preparation method thereof. The invention provides a heat shrinkable polyester film and a preparation method thereof, so as to solve the defect of poor performance of the existing heat shrinkable polyester film (a heat shrinkable for short) and the defects that the PVC (polyvinyl chloride) heat shrinkable film pollutes the environment, and is difficult to recover. The heat shrinkable polyester film is prepared from the following raw materials in percentage by weight: 20-59% of polyester material. 20-30% of anti-blocking master batch, 20-40% of filler particle master batch, and 1-10% of foaming agent master batch; the content of filler particles in the filler particle master batch is 30-50wt%; the content of a foaming agent in the foaming agent master batch is 10-20wt%; and the density of the polyester film is 0.8-1.3g / cm<3>. The raw materials of the polyester film are easy to obtain, the preparation method is simple and the polyester film is excellent in performance.

The invention relates to the field of polyester, particularly to a modified PET (polyethylene terephthalate) copolymer for a high-toughness heat-shrinkable film, a preparation method of the modified PET copolymer as well as the heat-shrinkable film prepared from the copolymer. The modified PET copolymer is formed by copolymerizing five monomers, namely, terephthalic acid, adipic acid, ethylene glycol, neopentyl glycol and isosorbide. According to the preparation method of the modified PET copolymer, continuous polymerization is performed on the basis of adoption of three-kettle short-process polyester continuous polymerization equipment. The modified copolymer obviously solves the problem of embrittlement of the PET heat-shrinkable film in another direction and improves the toughness of the heat-shrinkable film; the glass transition temperature of the prepared film is up to 76 DEG C, and the film has the higher heat resistance and meets requirements of some occasions with usage temperatures higher than 70 DEG C.

The invention discloses a solid electrolyte multilayer membrane for a lithium ion battery. The solid electrolyte multilayer membrane comprises a solid electrolyte layer and an organic polymer layer, wherein the upper and lower sides of the solid electrolyte layer are respectively provided with organic polymer layers. The solid electrolyte multilayer membrane replaces a traditional polyolefin-basedseparator to improve the lithium ion transmission rate and improve the rate performance of the lithium battery; the solid electrolyte membrane has the excellent heat shrinkage performance at a high temperature, and improves the safety performance of the battery; compared with the conventional composite solid electrolyte membrane, the ratio of solid electrolyte is increased, the electrical conductivity is increased, and the rate performance of the battery is improved; the organic polymer materials on both sides of the three-layer composite structure solid-state electrode membrane can bond theanode and the cathode in the lithium battery, so that the battery core is more firm, and the safety of the battery cores in the transportation and use process is improved.

The invention provides a high-safety ceramic diaphragm for a lithium ion battery. The high-safety ceramic diaphragm comprises a base membrane and ceramic slurry which is coated on the surface of the base membrane, wherein the ceramic slurry is prepared from the following components in parts by weight: 1 part of aluminum oxide, 0.0125 part of a dispersant, 0.3 to 0.4 part of a thickening agent, 0.1to 0.2 part of a waterborne adhesive and a wetting agent, wherein the mass part ratio of the wetting agent to a mixed solution containing the aluminum oxide, the dispersant, the thickening agent andthe waterborne adhesive is 0.001 to 1. The high-safety ceramic diaphragm has the advantages that the gram weight is enhanced, the thermal shrinkage performance of the diaphragm is improved, the puncture strength of the diaphragm is enhanced and the diaphragm is not easy to damage.

The invention relates to a polyethylene thermal shrinkage film, and belongs to the technical field of polyolefin films. The polyethylene thermal shrinkage film is characterized in that the thickness of the thermal shrinkage film is 50-60[mu]m; the thermal shrinkage film comprises an inner layer, a middle layer and an outer layer; in the inner layer and the outer layer, the mass ratio of metallocene polyethylene resin is 1 / 2-1 / 3, and the mass ratio of each of low-density polyethylene and high-density polyethylene is 1 / 4-1 / 3; in the middle layer, the mass ratio of the metallocene polyethylene resin is 1 / 2-4 / 5, and the mass ratio of the low-density polyethylene and / or the high-density polyethylene is 1 / 4-1 / 5; and the metallocene polyethylene resin is a copolymer of ethylene and alpha-olefin, the density is 0.930-0.940g / cm<3>, and the melt mass flow rate is 0.3-1.0g / 10min. By adding the specific metallocene polyethylene resin, the shrinkage performance of each layer is more coordinated; and the shrinkage performance and mechanical properties of the polyethylene thermal shrinkage film are ensured at a lower thickness.