7250 results about "Copolymer" patented technology

The invention discloses a high-bio-based PHA-acrylate emulsion paint as well as a preparation method and application thereof, and belongs to the technical field of water-based paints. The film former of the latex paint comprises 60% to 90% of polyhydroxyalkanoate (PHA) with a moderate crystallinity of 40% to 60%, and 10% to 40% of a specific bio-based acrylate copolymer with a Tg of not higher than 5 DEG C. According to the invention, a core-shell microstructure in which a rigid PHA phase is wrapped by a flexible acrylate phase is constructed through a key process including ultrasonic treatment. According to the structure, low-temperature film forming can be achieved without a VOC coalescing agent, the bio-based content of an obtained paint film is higher than 70%, the VOC content is lower than 0.5 g / L, the scrub resistance is larger than 7000 times, and the technical problem that high bio-based content and high performance of a PHA coating are difficult to achieve at the same time is solved.

Systems and methods are provided for stabilization of cells and retention of biomolecules therein for further analysis. Block copolymers are inserted into membranes of biological particles, cell membranes or organelles (e.g., organelle membranes) and polymerized to form an intra-biological particle (e.g., intracellular) polymer network.

A coating composition comprises: a fluoro-aliphatic group-containing copolymer comprising a repeating unit A corresponding to a fluoro-aliphatic group-containing monomer, and a repeating unit B corresponding to at least one monomer, wherein each of the I / O values of said at least one monomer constituting the repeating unit B is 1.0 or less.

The invention belongs to the technical field of anion exchange membranes, and relates to a cross-linked polyaromatic piperidine anion exchange membrane and a preparation method thereof. The exchange membrane structure comprises a copolymer structure of the following repetitive structural units, the selected rigid main chain polyaromatic hydrocarbon can ensure the mechanical strength of the anion exchange membrane, meanwhile, the toughness of the anion exchange membrane is further enhanced by adopting a cross-linked structure, and a formed cross-linked network can reduce swelling of the anion exchange membrane, so that the anion exchange membrane is more stable in performance. The mechanical performance is improved; according to the invention, ether-free skeleton polyaromatic hydrocarbon is selected as a main chain and has the characteristic of strong alkali-resistant stability, six-membered nitrogen heterocyclic ions are adopted as functional groups, and a large steric hindrance structure can hinder nucleophilic substitution and elimination reaction, so that the alkali-resistant stability of the anion exchange membrane is improved, and the service life of the anion exchange membrane is prolonged. And in the # imgabs0 #, X is equal to 0.05 to 0.15.

The invention discloses a preparation method of a natural fiber prepreg with an improved impregnation effect, and relates to the technical field of composite material preparation, the method comprises the following steps: carrying out synergistic modification through fiber surface plasma activation and silane grafting, and combining a gradient pressure-temperature coupling impregnation system and ultrasonic-assisted permeation to prepare the natural fiber prepreg with the improved impregnation effect. And gradient filling and interface chemical bonding strengthening of the resin in the fiber bundle are realized. The core process comprises the following steps: pretreating fibers to improve surface energy and roughness, introducing a reactive diluent and a block copolymer into a resin system to regulate and control viscosity and transport capacity, constructing a pressure gradient by a multi-stage compression roller to drive resin to permeate into a bundle core, promoting uniform impregnation by infrared temperature control and ultrasonic cavitation, and finally obtaining uniform resin distribution and porosity lt. The interlayer shear strength is gt; and the high-performance prepreg is stable in batch under the pressure of 45 MPa. Reliable technical support and process guarantee are provided for large-scale engineering application of the high-performance natural fiber composite material.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a self-repairing type lithium ion battery positive electrode adhesive, a preparation method, positive electrode slurry and a positive electrode plate. The adhesive comprises a mixed solvent, and a first copolymer serving as a main component and a second copolymer serving as a cross-linking agent are dissolved in the mixed solvent; the first copolymer is an acrylate-based multipolymer containing carboxyl or hydroxyl; the second copolymer is isocyanate terminated UPy functional polyurethane; the adhesive is in a liquid state at room temperature, when the adhesive is subjected to vacuum heat treatment at 60-180 DEG C, carboxyl or hydroxyl in main components of the adhesive reacts with isocyanate groups of a cross-linking agent to form amido bonds along with volatilization of a mixed solvent, and UPy groups are associated through quadruple hydrogen bonds to form dual dynamic cross-linking points. The method can effectively adapt to the volume change of the positive electrode material in the lithium removal / insertion process, and maintains the integrity of the electrode structure, thereby improving the cycling stability and rate capability of the lithium ion battery.

The invention provides a low-smoke halogen-free flame-retardant cable material and a preparation method thereof, and belongs to the field of cable materials. The low-smoke halogen-free flame-retardant cable material is prepared from the following chemical components: 32 to 40 parts of nitrile rubber, 22 to 27 parts of natural rubber, 8 to 12 parts of benzoxazole-siloxane copolymer containing phosphate dynamic bonds, 13 to 15 parts of core-shell-sheath three-stage structure flame retardant, 4 to 6 parts of hexaphenoxy cyclotriphosphazene modified carbon nanotubes, 2 to 3 parts of europium-doped mesoporous cerium dioxide and 3 to 4 parts of nano zinc oxide. The composite material is prepared from the following components in parts by weight: 3 to 4 parts of carbon nanotube grafted montmorillonite hybrid, 2 to 3 parts of lubricant, 0.8 to 1.2 parts of cross-linking agent, 0.3 to 0.4 part of accelerant, 0.4 to 0.6 part of dicumyl peroxide and 0.1 to 0.2 part of antioxidant. Unification of high flame retardance, low smoke, excellent mechanical property and processability of the cable material is realized.

The invention relates to the technical field of chlorinated polyvinyl chloride plastics, in particular to a PVC corrosion-resistant cable protection pipe and a preparation process thereof. The invention aims to solve the problem that the mechanical property and the corrosion resistance of the existing PVC cable protection pipe cannot be considered at the same time. Chlorinated polyvinyl chloride and polyvinyl chloride are subjected to hot mixing to obtain matrix resin, and the corrosion-resistant additive, the composite flame retardant, the flexibilizer and other additives are added to obtain the cable protection tube. The corrosion-resistant additive is obtained by grafting and modifying nano silicon dioxide with epoxy resin and premixing with an ethylene-vinyl alcohol copolymer; the composite flame retardant comprises core layers of nitrogen series, phosphorus series and inorganic hydroxides and a shell layer of an acrylate polymer, and is obtained through a core-shell reaction; the cable protection pipe is prepared through a multi-step mixing process; by introducing the core-shell structure and the corrosion-resistant auxiliary agent, efficient flame retardance and corrosion resistance are achieved, stress is buffered through the flexible shell layer, and the mechanical property of the material is maintained.

The invention relates to the technical field of insulating materials, in particular to insulating powder and a preparation method thereof. The invention discloses a flame-retardant coating which comprises the following components in parts by weight: 15-25 parts of epoxy resin, 10-20 parts of aluminum hydroxide, 5-12 parts of nano boron nitride, 1-3 parts of a silane coupling agent KH-560, 3-8 parts of polytetrafluoroethylene micro powder, 2-6 parts of fluorine-modified montmorillonite, 4-9 parts of melamine cyanurate, 2-5 parts of nano titanium dioxide, 1-4 parts of a fluorine-modified graphene oxide-polyaniline composite material and 0.5-2 parts of pentaerythritol stearate. The anti-corrosion coating is prepared from the following components in parts by weight: 1 to 3 parts of nano zinc oxide, 5 to 10 parts of glass fiber, 2 to 5 parts of polyhedral oligomeric silsesquioxane-polyimide copolymer, 1 to 4 parts of ferrocenyl epoxy resin and 0.5 to 2 parts of perfluorooctyltriethoxysilane. The insulation powder is high in corrosion resistance, excellent in insulation, heat dissipation and mechanical performance, environmentally friendly in processing, good in adaptability, capable of prolonging the service life of equipment and reducing the cost, suitable for special environments and wide in popularization prospect.

The invention discloses a shale oil carbon dioxide flooding surfactant and a preparation method thereof, and belongs to the technical field of surfactants. The rock oil carbon dioxide flooding surfactant is prepared from the following components in parts by weight: 100 parts of water, 40 to 60 parts of fluorine-containing copolymer, 15 to 25 parts of sodium dodecyl benzene sulfonate, 10 to 20 parts of polyoxyethylene ether surfactant containing siloxy and 5 to 10 parts of nanoparticles. The fluorine-containing copolymer, the sodium dodecyl benzene sulfonate, the siloxy-containing polyoxyethylene ether surfactant and the nanoparticles are compounded, so that on one hand, the surfactant has relatively high salt tolerance and temperature tolerance so as to adapt to the environment of a shale oil reservoir; on the other hand, the surface activity is synergistically improved, the interfacial tension is reduced, the rock surface wettability is changed, and the system stability is enhanced, so that higher recovery efficiency is realized.

The invention discloses a trimethoxy-substituted PTAA copolymer as well as a preparation method and application thereof. The structural formula of the trimethoxy-substituted PTAA copolymer is shown as a formula (I), the perovskite solar cell prepared from the trimethoxy-substituted PTAA copolymer disclosed by the invention has relatively high open-circuit voltage, and the energy conversion efficiency of the perovskite solar cell is effectively improved.

The invention relates to the technical field of titanium dioxide, and discloses a preparation process of oil paint core-coated titanium dioxide, which comprises the following steps: a core layer is rutile type titanium dioxide particles with the particle size range of 0.1-0.5 mu m and the specific surface area of 8-15m < 2 > / g, an inorganic coating layer is composed of silicon dioxide and aluminum oxide according to the mass ratio of 1: (0.2-1.5), the coating thickness is 5-15% of the diameter of the core layer, and the inorganic coating layer is composed of silicon dioxide and aluminum oxide according to the mass ratio of 1: (0.2-1.5). Wherein the silicon dioxide is coated by a hydrolytic deposition method, the aluminum oxide is coated by a sol-gel method, the organic coating layer comprises a copolymer containing a silane coupling agent and organic silicon resin, the organic silicon resin is methyl phenyl silicon resin, the organic coating layer accounts for 1-8% of the total mass of the titanium dioxide, and the surface contact angle of the organic coating layer is greater than or equal to 110 degrees. According to the preparation process of the oil paint core-coated titanium dioxide, an inorganic-organic gradient coating system is constructed, so that the core-coated titanium dioxide has a gloss retention rate of more than 95% (ASTM D523) and a delta E color difference of less than 1.5 (ISO 7724) after 1000 hours in a QUV accelerated aging test, and the weather resistance of the core-coated titanium dioxide is improved by more than 3 times compared with that of the traditional titanium dioxide.

The invention relates to the technical field of food processing, and discloses casein-tea polysaccharide-polyphenol composite nanoparticles and a preparation method of the casein-tea polysaccharide-polyphenol composite nanoparticles, and the preparation method comprises the following steps: mixing large yellow tea polysaccharide with a casein solution to obtain a CS / TPS mixed solution; performing glycosylation modification on casein in the CS / TPS mixed solution by adopting a Maillard reaction to prepare a casein-polysaccharide copolymer solution; the preparation method comprises the following steps: mixing a plurality of catechins, dissolving the catechins in ultrapure water to obtain a mixture stock solution, mixing the mixture stock solution and a casein-polysaccharide copolymer solution according to a volume ratio of 1: 16, stirring for 1 hour for self-assembly, pre-freezing the stirred solution at-80 DEG C, and freeze-drying for 48 hours to obtain CS-TPS-MIX nano-composite powder. According to the invention, a polyphenol delivery system with a dual antioxidant synergistic mechanism is constructed through a Maillard reaction mediated nano-composite technology, and the system is stable in structure, so that the release of polyphenol is more controllable.

Provided is a polyamide resin, which is a copolymer of a biodegradable polyamide, such as polyamide 2 to polyamide 4, and another polyamide, the polyamide resin having enhanced biodegradability. The polyamide resin contains a structural unit represented by Formula (1) and another polyamide structural unit, and a difference between a degree of randomness determined based on a proportion of each structural unit as determined by 1H-NMR measurement when structural units are assumed to have an ideal random sequence and a degree of randomness determined based on a proportion of carbonyl carbon of an amide group linking different structural units with respect to a total peak integrated value for carbonyl carbon as determined by 13C-NMR measurement is 0.10 or less, where in Formula (1), x is an integer of 1 or greater and 3 or less.

The invention relates to the technical field of medical supplies, and discloses an anti-puncture medical packaging film and a preparation method thereof. Comprising the following raw materials in parts by weight: an ethylene copolymer, modified aramid fibers, a reinforcing agent, an auxiliary agent, an antioxidant and an antistatic agent. The preparation method of the anti-puncture medical packaging film comprises the following steps: raw material blending, tape casting, film blank drying, stretching and shaping, and rolling. According to the technology, the modified aramid fibers are fully dispersed in the packaging film with the ethylene copolymer as the matrix, so that the puncture resistance of the packaging film is greatly improved, sharp objects are effectively prevented from penetrating through the packaging film, medical products are better protected, the damage risk of the products in the transportation and storage process is reduced, meanwhile, through modification, the service life of the packaging film is prolonged, and the service life of the packaging film is prolonged. The antibacterial performance is improved, and the medical material is more suitable for protection application of medical equipment.

The invention relates to a phosphorus-free zinc-free seawater special-purpose scale and corrosion inhibitor, which comprises, by weight, 20-25% of sulfonic acid modified polyaspartic acid, 8-12% of quaternized chitosan, 5-10% of a sulfonate copolymer, 5-10% of polyepoxysuccinic acid, 1-3% of benzotriazole or methyl benzotriazole, 0.5-1% of sodium tungstate, and the balance of deionized water. According to the formula, traditional corrosion inhibitors such as phosphorus and zinc are completely abandoned, functions are achieved through natural polymer derivatives such as sulfonic acid modified polyaspartic acid and quaternized chitosan, and the scale and corrosion inhibitor has the following environmental protection advantages that the scale and corrosion inhibitor does not contain phosphorus and zinc elements at all, and water eutrophication and heavy metal accumulation caused by a traditional phosphorus and zinc formula are avoided.

The invention provides a high-hydrophobicity anti-pollution flashover coating and a preparation method thereof, and relates to the field of coatings. The silicone rubber composition is prepared from the following raw materials in parts by weight: 80 to 100 parts of hydroxyl-terminated polydimethylsiloxane; 5 to 15 parts of modified nano silicon dioxide; 10 to 30 parts of a composite self-repairing microcapsule; 10 to 25 parts of a flame retardant; 3-8 parts of a cross-linking agent; 0.5-2 parts of a catalyst; 1-5 parts of an accelerant; 40 to 100 parts of a solvent; the modified nano silicon dioxide is fumed silica subjected to surface treatment by a fluorine-containing silane coupling agent and a platinum catalyst; the capsule wall of the composite self-repairing microcapsule is a polylactic acid-glycolic acid copolymer, and the capsule core of the composite self-repairing microcapsule is a mixed solution of a hydroxyl-terminated polydimethylsiloxane oligomer and methyltris (methylethylketoximino) silane. The coating has excellent hydrophobicity, weather resistance and targeted repair function.

The invention discloses a silicon negative electrode binder as well as a preparation method and application thereof. The silicon negative electrode binder is a graft copolymer with a comb-shaped structure; the grafted copolymer comprises a polyurethane chain segment forming a main chain of the comb-shaped structure, a polyacrylic acid chain segment serving as a branch chain and connected to the main chain through a covalent bond, and a fluorine-containing chain segment. According to the preparation method, a graft copolymerization method is adopted, the preparation method is carried out in a water-based system, the silicon negative electrode binder with hardness and softness is obtained, and the silicon negative electrode binder is applied to a lithium battery through the synergistic effect of mechanical property, interface stability and electrochemical performance. And a solution of a key material is provided for a high-capacity and long-cycle lithium battery which takes an active material with high silicon content as a negative electrode.

The invention discloses a preparation method and application of a zinc-bromine flow battery positive electrode material, and belongs to the field of zinc-bromine flow batteries. The preparation method comprises the following steps: dissolving aniline and a dithio compound in an acidic ice bath, dropwise adding a peroxy strong oxidant to generate a polyaniline-disulfide bond copolymer, dialyzing, and freeze-drying to obtain powder; then heating soluble silver salt, a reducing agent, a hydrophilic dispersing agent and an organic sulfydryl silane coupling agent to prepare functionalized nano-silver particles; the powder and nano-silver particles are dispersed in N-methyl pyrrolidone for ultrasonic treatment, and dynamic self-repairing coating slurry is prepared; and performing acid pretreatment on the carbon fiber paper, and performing electrochemical deposition on the slurry to prepare the zinc-bromine battery positive electrode material. According to the zinc-bromine battery positive electrode material, the coulombic efficiency and the voltage efficiency of a zinc-bromine flow battery are remarkably improved and the cycle life of the zinc-bromine flow battery is remarkably prolonged through methods of dynamic covalent bonds, nano-silver catalysis, a hierarchical pore structure, carbon fiber pretreatment and the like, and the zinc-bromine flow battery positive electrode material has chemical stability, efficient bromine adsorption capacity and excellent catalytic activity.

The invention relates to environment-friendly hydrophobic ink and a preparation method thereof, and belongs to the technical field of water-based ink. A copolymerization modifier capable of being combined in a water-based polyacrylate emulsion in an initiation polymerization mode in the stage of preparing the modified water-based polyacrylate emulsion is prepared, and an o-hydroxy aromatic ketone structure in the copolymerization modifier can endow water-based ink with lasting ultraviolet absorption performance; the trifluoromethyl structure can reduce the surface energy of the water-based ink, and the benzimidazole ring structure can form stable coordinate bonds with metal ions, so that the bonding performance of the water-based ink and a metal substrate is enhanced; when the copolymerization modifier is used for modifying the water-based polyacrylate emulsion, the long-term performance, the hydrophobic and oil-resistant performance and the adhesion performance on the surface of a metal base material of the finished water-based ink can be effectively improved.

The invention relates to the technical field of PC transparent flame-retardant toughening modification, in particular to phenolic hydroxyl-terminated modified polysiloxane with a side chain containing phenyl and sulfonate groups and a preparation method of copolymerized PC. The modified polysiloxane is prepared by the following steps: performing ring opening polymerization on phenol-containing double end sockets and cyclotetrasiloxane to obtain modified polysiloxane containing double bonds and phenyl functional groups, and grafting sulfonate through a thiol-ene click chemical reaction. Diphenyl carbonate, bisphenol A and the modified polysiloxane are used as raw materials, a polysiloxane-PC block copolymer is formed through copolymerization, efficient flame retardance and high transparency are achieved, and meanwhile extremely high low-temperature impact strength is achieved.

A method of preparing an acrylate-functional branched organosilicon compound (“compound”) is provided, and comprises reacting (A) a branched organosilicon compound and (B) an acrylate compound in the presence of (C) a catalyst, wherein component (A) has the general formula X—Si(R1)3, where X comprises a halogen-functional moiety and each R1 is selected from R and —OSi(R4)3, with the proviso that at least one R1 is —OSi(R4)3; each R4 is selected from R, —OSi(R5)3, and —[OSiR2]mOSiR3; each R5 is selected from R, —OSi(R6)3, and —[OSiR2]mOSiR3; each R6 is selected from R and —[OSiR2]mOSiR3; each R is an independently selected hydrocarbyl group; and 0≤m≤100; with the proviso that at least one of R4, R5 and R6 is —[OSiR2]mOSiR3. The compound prepared by the method, a copolymer comprising the reaction product of the compound and a second compound, a method of forming the copolymer, and a composition comprising the copolymer are each also provided.

The present application relates to the technical field of bio-based polymer material, and more particularly to a full bio-based PBAT-PLA copolymer, a preparation method and an application thereof, which is prepared by melt mixing bio-based polybutylene adipate terephthalate, bio-based polylactic acid and bio-based multi-epoxy chain extender through a twin-screw extruder, so that the tensile strength of the full bio-based PBAT-PLA copolymer is 31.5-44.3 MPa, and the elongation at break is 85-498%. The bio-based multi-epoxy chain extender prepared by specific selection can simultaneously improve the tensile strength and elongation at break of the full bio-based PBAT-PLA copolymer, and solve the technical problems of poor compatibility of traditional bio-based polylactic acid and non-bio-based polybutylene adipate terephthalate, and the technical problem that the addition of existing chain extenders cannot simultaneously improve the tensile strength and elongation at break of the copolymer.

The invention relates to the technical field of high-performance polyester fibers, and discloses a dry skin-friendly fiber fabric, a preparation method thereof and application of the dry skin-friendly fiber fabric in underwear. The preparation method of the dry and comfortable skin-friendly fiber fabric comprises the following steps: carrying out reaction on terephthalic acid, ethylene glycol and an antibacterial modified diamide diol monomer to obtain modified polyester; the modified polyester and the polyester master batch are mixed and spun, and the modified profiled polyester fiber is obtained; dipping the modified profiled polyester fiber in a finishing liquid containing a biopolymer finishing agent to obtain the high-performance polyester fiber, blending and knitting high-performance polyester fibers, cotton fibers and mulberry silk fibers to obtain a dry skin-friendly fiber fabric; the dry and comfortable skin-friendly fiber fabric has excellent antibacterial performance, moisture absorption performance and skin-friendly performance, the skin can be kept dry and comfortable, safe and comfortable wearing experience is provided for a wearer, and the dry and comfortable skin-friendly fiber fabric can be used for underwear and other underwear materials.

The present invention relates to an elastomeric laminate comprising at least two adjacent layers, wherein: the rubber composition constituting the first layer is based on 20 phr to 100 phr of at least one copolymer comprising ethylene units and 1,3-diene units of formula CH2=CR-CH=CH2, the ethylene units in the copolymer representing more than 50 mol% of the copolymer monomer units, and the symbol R represents a hydrocarbon chain having 3 to 20 carbon atoms, 0 phr to 80 phr of at least one diene elastomer having a diene unit weight concentration greater than 50%, 10 phr to 100 phr of a plasticizing system comprising at least one plasticizing resin having a glass transition temperature higher than 20°C and / or at least one plasticizer which is liquid at 23°C, and a reinforcing filler, and a crosslinking system; the rubber composition constituting the second layer is based on a diene elastomer having a diene unit weight concentration greater than 50% and a crosslinking system. The present invention also relates to a rubber article, in particular a pneumatic or non-pneumatic tire, comprising such a laminate.

The invention discloses a low-temperature-resistant organic silicon elastic damping body and a preparation method thereof, and belongs to the field of synthesis of organic polymer materials. The invention relates to a high-efficiency photoinitiator, which is prepared from the following ingredients in parts by weight: 95 to 110 parts of fluorosiloxane-phenylsiloxane segmented copolymers, 25 to 35 parts of boric acid ester end-capped polyurethane prepolymers, 10 to 15 parts of neodymium-containing metal organic frameworks, 20 to 40 parts of azobenzene modified CNT / TiO2, 2 to 4 parts of photoinitiators 1173 and 2 to 3 parts of neodymium acetylacetonate. Ultralow-temperature adaptability, self-repairing and high-modulus coexistence and wide-temperature-range damping stability are achieved through fluorosilicone / phenyl block copolymer molecular design, a borate-neodymium coordination double-dynamic network, stress response filler and a light-heat gradient curing process. The low-temperature-resistant organic silicon elastic damping body prepared by the invention provides a new solution idea for an extreme environment damping material, and has a wide application prospect.

The present invention relates to the field of oilfield chemical technology, and proposes a fast-soluble hydrophobic associating polymer for reinjection water for fracturing and a preparation method thereof. Hydrophobic functional monomers and non-ionic polarity regulators are prepared into polymerizable hydrophobic associating micelles, and the polymerizable hydrophobic associating micelle solution and conventional monomer aqueous solution are mixed. The molecular weight of the copolymer is regulated by a molecular weight regulator, and the fast-soluble hydrophobic associating polymer for reinjection water is obtained after reaction, granulation, drying and crushing. It comprehensively utilizes the synergistic effect of the multi-component supramolecular forces of the ternary hydrophobic functional monomers to achieve stability regulation of the associating micelles, and obtains a three-dimensional network structure of salt-resistant polymers with a dense associating network and a strong associating effect; introduces a polarity regulator containing a non-ionic hydrophilic structure, and utilizes self-assembly to form a hydration layer on the surface of the associating micelles, thereby weakening the water-phase aggregation effect and ion shielding effect of the hydrophobic structure, which is beneficial to the stretching of the molecular chain in the water phase, and obtaining the online mixing and fast-dissolving efficiency of the reinjection water, and having both high salt resistance and strong sand carrying performance.

The lithium secondary battery comprises a positive electrode, a negative electrode, a diaphragm and a polymer electrolyte, the polymer electrolyte contains the flame-retardant microcapsule, the flame-retardant microcapsule has a core-shell structure, a copolymer material containing one or more of an amide group, an ester group and an ether group is taken as a shell layer, and a flame retardant is taken as a core; the rupture collapse temperature of the flame-retardant microcapsule shell material is 60-120 DEG C, the melting point of the flame retardant is 20-120 DEG C, and the rupture collapse temperature of the copolymer material is higher than the melting point of the flame retardant. The lithium secondary battery disclosed by the invention has excellent flame retardance, the flame-retardant microcapsule added in the lithium secondary battery can be broken and collapsed when the battery is in thermal runaway, and the flame retardant is quickly released, so that the thermal runaway is actively defended in advance from the interior of the battery, and the electrochemical performance of the battery is not reduced.

Hot melt adhesive including a polar group-containing olefin copolymer has: number average molecular weight (Mn) between 10 to 50 kg / mol, crystallinity (Xc) content below 30%, enthalpy (ΔH) between 5 to 65 J / g, polydispersity index (PDI) from 2 to 6, melting temperature (Tm) between 40 and 120° C., and including at least 80 mol % of a constituent unit of formula (1), optionally a constituent unit of formula (2), and between 0.1 to 1 mol %, of a constituent unit of formula (3):wherein R1 is H or CH3; R2 is a hydrocarbyl group having 0 to 10 carbon atoms; R3 is a hydrocarbyl group having 2 to 10 carbon atoms, when X is hydroxyl functionality or a hydrocarbyl group having 0 to 10 carbon atoms, when X is polar organic group containing at least one carboxylic acid functionality and 0 to 6 carbon atoms.

The invention relates to the technical field of ship protection materials, in particular to a ship accessory rust-proof coating and a preparation method thereof.The ship accessory rust-proof coating comprises the following three-layer structure and components from inside to outside: a basic corrosion-resistant layer comprises 10-30 parts of a nano ceramic material; 5-15 parts of a rare earth oxide; 0.5 to 1.5 parts of aminated graphene oxide; 40 to 60 parts of fluorocarbon resin; 20 to 30 parts of epoxy-polyurethane hybrid resin; 3-8 parts of a zinc phosphate corrosion inhibitor; 2-5 parts of a self-repairing microcapsule; 1-3 parts of a photoinitiator; the interface transition layer comprises the following components in parts by weight: 3-5 parts of gamma-aminopropyltriethoxysilane; 2-5 parts of organic silicon resin coated copper powder; the antifouling surface layer comprises the following components in parts by weight: 10-15 parts of Cu coated SiO2 core-shell particles; 10 to 15 parts of a copolymer of polydimethylsiloxane and methyltrimethoxysilane; and 1-3 parts of an antifouling auxiliary agent. According to the multifunctional protective coating for the ship, through the synergistic effect of multiple components, comprehensive improvement of corrosion resistance, pollution resistance, self-repairing and construction efficiency is achieved, and remarkable technical progress and practical value are shown.