246results about "Nitrile polymer adhesives" patented technology

The present disclosure relates to a fluoride-free binder material for a positive electrode, and a preparation method therefor and the use thereof. Provided are a fluoride-free binder material for a positive electrode and a preparation method therefor. A copolymer of acrylonitrile and an acrylate is used as a main body structure, an ionic monomer is introduced, and a polyfunctional olefin monomer is introduced during polymerization to increase the branching degree of a polymer, thereby preparing a highly-branched acrylonitrile polymer modified via copolymerization, which polymer is used as a fluorine-free binder material for a positive electrode. The modified binder can provide more sites for contact between active materials and between a current collector and the active materials so as to further enhance the bonding ability, thereby increasing the overall cohesive force and improving the adhesion to the current collector; and the binder can effectively inhibit the fracture and delamination of an electrode sheet during processing, ensures the compactness of a positive electrode material even in the case of a low use amount, and retains structural integrity and cycling stability during cycling.

The present application provides a polymer, a preparation method, a negative electrode sheet, a secondary battery, and an electric device. The polymer comprises a structural unit derived from an unsaturated carboxylic acid monomer, a structural unit derived from an unsaturated cyano monomer, and a structural unit derived from a flexible monomer. The glass transition temperature of the flexible monomer is -60°C to 0°C, and optionally -55°C to -15°C. The polymer can reduce the warping of electrode sheets and widen processing windows of electrode sheets.

The invention provides a binder, a positive pole piece and a secondary battery. The binder comprises a fluorine-free polymer, the fluorine-free polymer comprises a first structural unit and a second structural unit, and the pH value of the binder is 6-10. The binder disclosed by the invention not only has good bonding performance, but also has the effects of inhibiting collapse of a main material structure under high temperature and high voltage and reducing internal heat production of the secondary battery, so that the positive pole piece has good safety performance and cohesion, and the thermal safety performance and energy density of the secondary battery are improved.

The embodiment of the invention provides a binder, a positive plate and a battery, the binder comprises a nitrile structural unit, an ether structural unit, a nitrogen heterocyclic structural unit and a sulfonic acid structural unit, and the swelling degree of the binder is 20-40%. According to the present invention, the adhesion, the flexibility, the swelling resistance and other properties of the binder can be improved, the flexibility of the electrode plate using the binder can be improved, and the electrochemical properties such as the improvement of the first efficiency and the cycle life of the battery can be considered.

The present invention provides: an adhesive composition capable of forming an adhesive layer that has particularly excellent adhesive characteristics when voltage is not applied thereto, exhibits a sufficient reduction in adhesive force when voltage is applied thereto, and has excellent impact resistance; an adhesive sheet provided with an adhesive layer formed from the adhesive composition; and a bonded body of the adhesive sheet and an adherend. The present invention relates to an adhesive composition containing an emulsion-type acrylic polymer (A) and an electrolyte (B), wherein the emulsion-type acrylic polymer (A) contains a monomer unit derived from a cyano group–containing monomer.

The invention discloses a binder for a lithium battery diaphragm cold pressing process and a preparation method thereof, and relates to the technical field of lithium battery diaphragm binders, the binder is prepared from the following components: an acid monomer, an amide monomer, a nitrile monomer, an acrylate monomer, an ether bond-containing polyfunctional group monomer, a long side chain hydrocarbon chain monomer, a neutralizer and an initiator. The preparation method comprises the following steps: mixing the binder components, and adding the binder components into deionized water to form a mixed solution; adding an initiator under the protection of nitrogen, and heating for reaction; and after the reaction is finished, adding a neutralizer to adjust the pH value, diluting and vacuumizing to remove residual monomers. The ether bond-containing polyfunctional group monomer is introduced to form a three-dimensional network structure, so that cohesion is reduced, and a dry film is soft and adapts to a 25 DEG C cold pressing process; and meanwhile, a long-side-chain hydrocarbon chain monomer is introduced, so that the compatibility and wettability with the PE / PP diaphragm are improved, and low-energy-consumption cold pressing bonding is realized.

Disclosed is a polymer comprising structural units represented by formula (I) or formula (II) and structural units having an oxiranyl group. (In formula (I): R1 represents a hydrogen atom or a methyl group; M represents an alkylene group or an alkylene oxide chain; A represents a group represented by formula (a) or formula (b); and R2 represents an alkyl group, an aryl group, an aralkyl group, or a hydrogen atom.) (In formula (a), * represents a bonding position.) (In formula (b), * represents a bonding position.) (In formula (II): R3 represents a hydrogen atom or a methyl group; and R4 represents an alkyl group, an aryl group, an aralkyl group, or a hydrogen atom.)

The invention provides a binder, a preparation method thereof, a battery and electric equipment. The adhesive comprises an acrylate polymer, the number-average molecular weight of the acrylate polymer is 10kDa-3000kDa, the molecular structure of the acrylate polymer contains side chain groups, the side chain groups comprise fluorine-containing chain segments, cyano chain segments and crosslinkable chain segments, the mass ratio of fluorine in the molecular structure is 3%-30%, the mass ratio of cyano chain segments in the molecular structure is 3%-30%, and the mass ratio of cyano chain segments in the molecular structure is 1%-5%. The mass ratio of the cyano group in the molecular structure is 10%-40%.

This application discloses a solution-type adhesive, a method for producing the same, and its use. The production of the adhesive mainly comprises the following steps: First, latex particles are obtained by emulsion polymerization of alkyl acrylate monomers, nitrile monomers, and functional monomeric acids. The latex particles have a uniform particle size and are rich in polar functional groups, and can serve as seeds for precipitation polymerization. Nitrile monomers, functional monomeric acids, and acrylamide are used as precipitation polymerization monomers, and the resulting oligomers are deposited on the seed polymer surface by hydrogen bonding and hydrophobicity, forming precipitated particles. Further neutralization with an alkaline solution yields a solution-type adhesive. The solution-type adhesive provided in this application is applied to the negative electrode of a lithium-ion battery, has high adhesive strength, low electrolyte swelling, a certain degree of processing flexibility, a simple manufacturing process, and high lot stability.

The invention discloses a sulfonyl-containing high-voltage-resistant positive electrode adhesive, a preparation method thereof, a battery positive electrode and a lithium ion battery, and belongs to the technical field of lithium batteries. The adhesive is a random copolymer of an acrylonitrile monomer, a sulfonyl-containing monomer and poly (ethylene glycol) methyl ether methacrylate, the sulfonyl-containing monomer has excellent oxidation resistance, can assist in forming CEI rich in inorganic components, and is beneficial to maintaining the structural stability and electrochemical stability of the CEI in the cyclic process; acrylonitrile can improve the adhesion and stabilize the surface structure of the positive electrode active material; by adding poly (ethylene glycol) methyl ether methacrylate, the flexibility of the polymer can be improved, and stress generated by volume change in the long-term charging and discharging process can be buffered. The sulfonyl-containing high-voltage-resistant positive electrode functional adhesive can effectively regulate and control CEI components, inhibits interface side reactions, and effectively improves the cycling stability of a high-voltage positive electrode battery.

The invention provides a polyacrylic acid powder binder, a preparation method thereof, a negative pole piece and a battery. The polyacrylic acid powder binder comprises 0.95 wt%-1.05 wt% of an aqueous solution of the polyacrylic acid powder binder, wherein the viscosity of the aqueous solution is 1000 mPa.S to 4000 mPa.S; comprising the polyacrylic acid powder binder meets the following conditions: the standing time of the negative electrode paste is less than or equal to 7 days, and the ratio of the solid content of the upper-layer negative electrode paste to the solid content of the lower-layer negative electrode paste is (0.988-1.0): 1. According to the polyacrylic acid powder binder provided by the invention, the viscosity and the suspension thickening capability of the polyacrylic acid powder binder can be improved by limiting the viscosity of the aqueous solution of the polyacrylic acid powder binder and the ratio of the solid content of the upper layer to the solid content of the lower layer in the negative electrode slurry formed by the polyacrylic acid powder binder; when applied to the battery, the composite material can reduce the internal resistance of the battery and improve the cycle performance of the battery.

The invention belongs to the technical field of batteries, and discloses a binder and a preparation method thereof, a positive plate and a battery. The adhesive comprises a copolymer, and the copolymer comprises the following components in percentage by mass: 10%-15% of an acrylic acid monomer polymerization unit, 40%-60% of a hard monomer polymerization unit, 15%-25% of a flexible monomer polymerization unit and 5%-20% of a polar modified monomer polymerization unit; in the acrylic monomer polymerization unit, the neutralization degree of the acrylic monomer is greater than or equal to 10%. According to the present invention, by designing the composition and the preparation method of the binder, the binding performance of the binder is improved, and the binder is used in the battery so as to easily improve the cycle performance of the battery.

The invention relates to the field of lithium ion battery adhesives, in particular to a PVDF adhesive power improving accelerant and a preparation method thereof. The accelerant comprises modified polyacrylonitrile, modified polyimide and a high-efficiency solvent, the mass ratio of the modified polyacrylonitrile to the modified polyimide is 1: (0.2-2), and the high-efficiency solvent is selected from at least one of N, N-dimethylacetamide, N-methyl pyrrolidone and N, N-dimethylformamide. According to the accelerant prepared by the invention, the advantages of modified polyacrylonitrile (PAN) and modified polyimide (PI) are ingeniously combined, through scientific proportioning and a compounding technology, the adhesive force to PVDF is remarkably improved, meanwhile, the dosage of PVDF in a lithium ion battery is effectively reduced, and the energy density and the cycling stability of the battery are further improved.

To provide an eyelash fusion unit having numbers of artificial eyelash clusters connected to each other.SOLUTION: There is provided an artificial eyelash extension, in which an artificial eyelash cluster is firstly formed by using, for example, a hot melt method which exposes artificial hairs to a heat source and fixes them to each other. Next, numbers of clusters may be connected one after another to form an eyelash fusion unit. For example, the eyelash fusion unit may include three clusters connected linearly to each other. Preferably, a number of eyelash fusion units are connected to each other and are arranged close to each other to form a set. In some embodiments, a number of eyelash fusion units are positioned so that a shape of the set matches the curvature of a tight line of the eyelid. Preferably, an adhesive is applied to a top portion of each eyelash fusion unit in the set, and thereby a user can easily attach the set directly to the underside of his or her natural eyelashes (i.e., near the underside of the eyelid below the eyelash line).SELECTED DRAWING: Figure 3C

A water-soluble binder, a battery electrode sheet and the use thereof. The water-soluble binder comprises a copolymer. Polymeric monomers of the copolymer comprise a combination of a double-bond-containing nitrile monomer, a double-bond-containing amide monomer, a double-bond-containing carboxylic acid monomer, optionally a double-bond-containing sulfonic acid monomer and optionally a fifth monomer. The water-soluble binder is in the form of powder, and the mass percentage content of the copolymer in the water-soluble binder is greater than or equal to 92%. By means of the design of the polymeric monomers and the copolymer and the combination of the copolymer and the powder form, the water-soluble binder has excellent binding power, and can effectively inhibit the volume expansion of an electrode sheet during charge and discharge cycles, thereby improving the cycle performance of the electrode sheet and a lithium-ion battery.

The invention provides a water-based binder for a negative electrode of a lithium ion battery as well as a preparation method and application of the water-based binder, and belongs to the technical field of binders and lithium ion battery auxiliary materials. The water-based adhesive is prepared from the following components in parts by mass: 0.1 to 10 parts of a water-based polymeric dispersant, 10 to 20 parts of a hydrophilic unsaturated carboxylic acid monomer I, 60 to 70 parts of a hydrophobic unsaturated nitrile monomer I, 5 to 35 parts of an acrylate monomer, 40 to 55 parts of a hydrophilic unsaturated carboxylic acid monomer II, 5 to 20 parts of an unsaturated amide monomer, 20 to 40 parts of a hydrophobic unsaturated nitrile monomer II, 0.1 to 1 part of an oil-soluble initiator and 180 to 300 parts of water. The water-based adhesive provided by the invention has relatively low swelling degree and relatively high peel strength. The negative plate prepared from the aqueous binder has good flexibility, and can reduce the internal resistance of the lithium ion battery.

A resin composition exhibiting excellent adhesive strength when used as an adhesive and a cured product using the same are provided. Further, a laminate using the cured product and a method for producing the laminate are provided.A resin composition including: 1,1-dicyanoethylene (A), a polymerizable monomer (B) represented by general formula (I) below, and a polymerizable monomer (C) represented by general formula (II) below:CH2═CR1R2  (I)CHR6═CR7R8  (II)

A purpose of the present invention is to provide a thickener which is suitable for use as a thickener for adhesives and which, when used as a thickener for adhesives, especially cyanoacrylate-based adhesives, makes the adhesives have excellent long-term storage stability. The thickener includes a methacrylic resin having an Mw of 85,000-1,500,000. When the 25°C viscosity of an ethyl cyanoacrylate solution of the methacrylic resin is expressed by ƞ1 and the 25°C viscosity of the solution which has been allowed to stand at 60°C for 48 hours and then cooled to 25°C is expressed by ƞ2, then 1.0≤ƞ2 / ƞ1≤5.0 is satisfied (the solution has a methacrylic resin concentration of 20, 10, or 7 mass% depending on the Mw of the methacrylic resin).

The invention relates to the field of lithium ion batteries, in particular to a binder for a lithium ion battery as well as a preparation method and application of the binder. The binder for the lithium ion battery at least comprises the following raw materials in parts by mass: 40-75 parts of acrylonitrile, 15-40 parts of an acrylate monomer, 250-400 parts of an organic solvent and 0.2-1 part of an initiator. The finally prepared binder for the lithium ion battery not only has the characteristics of difficulty in gelling and high binding power, but also can replace the traditional positive electrode binder PVDF, solves the problem that gelling is easily caused when PVDF is applied to a high-nickel ternary lithium ion battery at present, and effectively improves the performance of a positive electrode piece and the lithium ion battery.

The invention discloses a binder composition which can be used in a dry electrode mixture or an electrode slurry to prepare an electrode. The binder composition includes a water-compatible copolymer and has a liquid content of less than 85% by weight based on the total weight of the binder composition. The lower liquid content binder composition improves the efficiency of transportation and storage as compared to conventional wet binder compositions. The binder compositions disclosed herein are versatile and can be successfully used in dry electrode mixtures and electrode pastes. Batteries comprising electrodes prepared using the binder compositions disclosed herein have electrochemical properties comparable to those of batteries comprising electrodes prepared by conventional wet binder compositions.

This invention relates to cyanoacrylate-containing compositions, which when cured provide improved bonding performance on aluminum substrates.

The invention discloses a perfluoropropyl vinyl ether-acrylonitrile copolymer as well as a preparation method and application thereof. The perfluoropropyl vinyl ether-acrylonitrile copolymer disclosed by the invention is formed by copolymerizing perfluoropropyl vinyl ether and acrylonitrile according to a molar ratio of 1: (2-4). The perfluoropropyl vinyl ether-acrylonitrile copolymer has the high pressure resistance of cyano groups, the flexibility of ether bonds and the hydrophobicity of fluorocarbon bonds, and has the advantages of being excellent in adhesive property, good in chemical stability, good in flexibility, balanced in hydrophilicity and hydrophobicity and the like; the lithium ion battery positive electrode material binder can improve the cycle life and the rate capability of the lithium ion battery under the conditions of high voltage and high load, and is suitable for large-scale industrial application.

The invention relates to the technical field of lithium ion battery key materials, in particular to a cross-linked polyacrylic acid / polyvinyl alcohol composite binder and a preparation method and application thereof. The binder is prepared by introducing N, N-dimethylformamide into a water-soluble acrylic monomer, an ethylenically-bond-containing acrylonitrile monomer and a vinyl ester monomer through ternary polymerization; n, N-methylene bisacrylamide (MBA) forms a rigid-flexible three-dimensional chemical cross-linked network, and then the rigid-flexible three-dimensional chemical cross-linked network and polyvinyl alcohol (PVA) construct an interpenetrating network (IPN) through hydrogen-bond interaction. The dual cross-linked network has the structural stability of chemical cross-linking and the dynamic adaptability of physical cross-linking, when the charging and discharging volume of the silicon-based negative electrode changes, stress is dissipated through network elastic deformation, meanwhile, interface bonding is strengthened through the ionic bond action of a lithium carboxylate group, active substance falling and electrode pulverization are inhibited, and the service life of the silicon-based negative electrode is prolonged. And the cycle life of the high-energy-density lithium ion battery is remarkably prolonged.

The application provides a preparation method of a binder, the binder is prepared from modified polyacrylonitrile through a cross-linking reaction and post-treatment; the modified polyacrylonitrile is a hydrolysis product of polyacrylonitrile, and the cross-linking agent of the cross-linking reaction is epichlorohydrin. The application also provides corresponding binders, lithium ion battery negative electrodes, lithium ion batteries and electrochemical devices. The binder of the application can significantly improve the cycle stability and rate performance of the battery, and the effect is particularly significant for a silicon negative electrode with large volume expansion. The preparation process of the binder of the application has the advantages of simple operation and low cost, and is easy to realize industrial production.

The invention provides a polymer, a preparation method, a negative pole piece, a secondary battery and an electric device. The polymer contains a structural unit derived from an unsaturated carboxylic acid monomer, a structural unit derived from an unsaturated cyano monomer and a structural unit derived from a flexible monomer, and the glass transition temperature of the flexible monomer is-60 DEG C to 0 DEG C, and can be-55 DEG C to-15 DEG C. The polymer can reduce warping of a pole piece and widen a processing window of the pole piece.

The purpose of the present invention is to provide a composition for a functional layer of an electrochemical element, said composition being capable of forming a functional layer having excellent wet adhesiveness. The present invention is a composition for a functional layer of an electrochemical element, which contains a particulate polymer having a volume particle diameter (D50) of 1.0-10.0 [mu] m (inclusive) and a particle size distribution ([alpha]), the particle size distribution [alpha] is such that the proportion of particles having a particle size of 1.5 times or more of the volume particle size D50 is 0.5-5 vol% when the particulate polymer is taken as 100 vol%, the particulate polymer is formed from particles containing a polymer, and the polymer contains an aromatic monovinyl monomer unit and a crosslinkable monomer unit.

The invention provides artificial eyelash grafts. The grafts include a plurality of eyelash fusions, each fusion including a plurality of artificial hair tufts connected to one another, each artificial hair tuft including a plurality of artificial hairs.

The present invention refers to a photocurable cyanoacrylate composition comprising a cyanoacrylate monomer and specific amounts of ferrocene, photoinitiator and radical polymerisation inhibitor. It also relates to a syringe or a cartridge comprising said photocurable composition, to the use of said composition for bonding substrates, to the use of said composition as nail coating, to a method for bonding substrates using said composition, and said composition for use as bioadhesive and biosealant.

The application discloses a kind of binder for lithium battery separator cold pressing process and preparation method thereof, it is related to lithium battery separator binder technical field, binder includes the following component is made: acid monomer, amide monomer, nitrile monomer, acrylic ester monomer, ether bond containing multifunctional monomer, long side chain hydrocarbon chain monomer, neutralizing agent, initiator.Preparation method includes the following steps: after mixing binder component, it is formed into mixed solution in deionized water;Nitrogen protection is added to initiator, heating reaction;After reaction is completed, neutralizing agent is added to adjust pH value, dilution and vacuum removal residual monomer are obtained after.The application forms three-dimensional network structure by introducing ether bond containing multifunctional monomer, reduces cohesion, makes dry film soft, adapts 25 DEG C cold pressing process;While introducing long side chain hydrocarbon chain monomer improves compatibility and wettability with PE / PP separator, realizes low energy consumption cold pressing bonding.