518 results about "Soft segment" patented technology

The invention provides a comb-shaped polymer binder, a pole piece and a battery, the comb-shaped polymer binder comprises an acrylate main chain, a flexible soft segment, a polar hard segment and a functional chain segment, the flexible soft segment, the polar hard segment and the functional chain segment are respectively grafted on the acrylate main chain, the flexible soft segment comprises an ether chain segment and / or an ester chain segment, the polar hard segment comprises a polar group and / or a first heteroaromatic ring group, and the functional chain segment comprises a functional group and a second heteroaromatic ring group. The functional chain segment comprises an aromatic ring group containing a pi-conjugated structure and / or a second heteroaromatic ring group containing a pi-conjugated structure. The comb-shaped binder adopts a structural design of'hard section anchoring + soft section buffering + functional side chain ', is helpful for enabling the binder to have high peel strength, stress buffering and electron conduction capabilities at the same time, is compatible with an existing wet coating-rolling process, is helpful for improving the peel strength and prolonging the cycle life of an electrode plate when being used for preparing the electrode plate, and is beneficial for improving the service life of the electrode plate. And the rate capability of the battery is improved.

The invention relates to the technical field of polyurethane coatings, in particular to a hydrophobic flame-retardant polyurethane coating and a preparation method thereof. The preparation method comprises the following steps: firstly, taking 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and methallyl alcohol as raw materials, and reacting to obtain hydroxyl grafted phosphaphenanthrene; taking 1, 1, 3, 3-tetramethyldisiloxane and methallyl alcohol as raw materials, and reacting according to a molar ratio of 1: 2 to obtain dihydroxy siloxane; then cyanuric chloride, hydroxyl grafted phosphaphenanthrene and dihydroxyl siloxane react according to the molar ratio of 1: 1: (1.5-1.8), and the dihydroxyl-terminated silicon-containing flame retardant is obtained. The preparation method comprises the following steps: mixing a dihydroxyl-terminated silicon-containing flame retardant with polytetrahydrofuran ether glycol to serve as a soft segment, and reacting with isocyanate to obtain a hydrophobic flame-retardant polyurethane emulsion; mixing the hydrophobic flame-retardant polyurethane emulsion, an anti-aging agent, an ultraviolet light absorber, a defoaming agent, kaolin, nano silicon dioxide and talcum powder to obtain the hydrophobic flame-retardant polyurethane coating.

The invention belongs to the field of electrochemical energy, and relates to polyurethane with self-repairing capability, a solid electrolyte, a composite electrode and a preparation method, a soft segment part of the self-repairing polyurethane-based solid electrolyte has good segment motion capability, and compared with polyethylene glycol, the crystallinity is greatly reduced; and the ionic conductivity and the lithium ion transference number are greatly improved. The dynamic disulfide bond and the hydrogen bond of the hard segment part jointly form a dynamic reversible macromolecular network, so that the mechanical strength is considered, and the tensile property, the self-healing property and the repeatable processing property are good. The self-repairing polyurethane-based solid electrolyte has relatively high ionic conductivity and lithium ion transference number, and can be cured on an electrode in situ to eliminate the interface contact problem of the electrolyte and the electrode, and the positive electrode and the negative electrode of the battery are healed into a whole through the self-healing capability of polyurethane, so that the performance of the battery is greatly improved, and the service life of the battery is prolonged. And the material has a good application prospect in all-solid-state lithium batteries.

The invention discloses a self-repairing nylon elastomer material as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, polymerizing a nylon monomer in the presence of an amine end-capping reagent to prepare a double-amino-terminated nylon hard segment; s2, adding the double-amino-terminated nylon hard segment, the double-carboxyl-terminated polyether and / or polyester soft segment and a disulfide bond-containing chain extender into a reactor, adjusting the proportion of the raw materials, and polymerizing under an optional auxiliary A to obtain a double-amino-terminated pre-polymerized nylon elastomer; and S3, adding the double-amino-terminated pre-polymerized nylon elastomer and a dialdehyde chain extender into the reactor, and carrying out a reaction in the presence of an optional auxiliary agent B to obtain the self-repairing nylon elastomer material. According to the self-repairing nylon elastomer material provided by the invention, the nylon elastomer can be self-repaired in various environments through the synergistic effect of various dynamic covalent bonds, and the polymerization efficiency is remarkably improved.

The invention discloses a large-current-carrying-capacity flexible power cable, which belongs to the technical field of cable preparation, is used for solving the technical problem that the flame retardant property and the mechanical property of the power cable need to be further improved in the prior art, and specifically comprises a cable core, a wrapping layer, an insulating layer and a sheath layer which are sequentially arranged from inside to outside. The preparation method comprises the following steps: preparing alkoxy silane containing a benzocyclobutene group, preparing flame-retardant particles by using a sol-gel method, preparing modified polyurethane by using modified polysiloxane and 2, 5-furandimethanol as soft segments, naphthalene diisocyanate as a hard segment and trimethylolpropane as a chain extender, and preparing the flame-retardant flame-retardant polyurethane. The linear low-density polyethylene, the MAH-g-PE, the modified polyurethane, the flame-retardant particles and the auxiliary additive are melted and extruded outside the wire core to form the insulating layer, so that the power cable is obtained, the flame-retardant property of the power cable is effectively improved, and the mechanical property and the current-carrying stability of the power cable are also improved.

The invention discloses a solvent-free vanillin-hydroxyethyl acrylate double-system closed waterborne polyurethane emulsion adhesive as well as a preparation method and a use method thereof, and belongs to the field of waterborne polyurethane emulsion adhesives. The invention is mainly prepared from the following components in parts by weight: 40 to 50 parts of soft segment monomer, 50 to 60 parts of hard segment monomer, 20 to 40 parts of sealing agent, 0.02 to 0.15 part of catalyst, 0.4 to 0.6 part of emulsifier, 0.2 to 0.6 part of initiator, 4 to 12 parts of neutralizer, 5 to 15 parts of functional monomer and 340 to 360 parts of deionized water. According to the double-system closed waterborne polyurethane emulsion adhesive disclosed by the invention, rapid crosslinking curing of the adhesive can be realized through thermocuring, the highest hardness of an adhesive layer can reach about 26 MPa, the adhesive strength is high, and the mechanical property is relatively good.

The invention discloses a low-staining low-viscosity waterborne polyurethane macromolecular coloring agent and a preparation method of the low-staining low-viscosity waterborne polyurethane macromolecular coloring agent. Comprising the following components in parts by weight: 15 to 30 parts of aliphatic diisocyanate, 15 to 30 parts of micromolecular dye, 10 to 30 parts of polypropylene glycol and / or dihydroxy silicone oil, 25 to 50 parts of polyethylene glycol, 1 to 3 parts of micromolecular dihydroxy compound chain extender, 0.05 to 0.3 part of catalyst, 90 to 140 parts of acetone and 50 to 300 parts of water. By designing the hydrophilicity and proportion of the soft and hard segments of the polyurethane coloring agent, the waterborne polyurethane macromolecular coloring agent color paste which is low in staining, easy to clean, less than 1000mpas in product viscosity, more than 5% in color concentration and more than 5% in dye equivalent and good in compatibility is finally obtained, and the waterborne polyurethane macromolecular coloring agent color paste can meet the requirements of liquid product coloring agents such as clothing care and household cleaning agents. The cleaning agent can also be used for liquid cleaning agent products for body care and catering.

The invention provides modified liquid epoxy resin, a liquid molding compound and a preparation method and application thereof, the modified liquid epoxy resin has a hard segment-soft segment-hard segment structure, the hard segment is composed of liquid epoxy resin, and the soft segment is composed of a flexible chain segment organic matter with an active group at the tail end. The liquid molding compound comprises the following components in percentage by mass: (A) 10-20% of the modified liquid epoxy resin; (B) 5-15% of a curing agent; (C) 70-90% of a filler; and (D) 0.1 to 1.5 percent of curing accelerator. The modified liquid epoxy resin provided by the invention can effectively reduce the crosslinking density, is beneficial to molecular movement, finally achieves the effects of reducing stress and shrinkage characteristics, can improve the toughness of a liquid plastic package material when being applied to the liquid plastic package material, reduces the internal stress and thermal expansion coefficient of the epoxy plastic package material, and has more excellent processability and process reliability.

The invention provides unsaturated waterborne polyurethane, a polyurethane composite material as well as a preparation method and application of the unsaturated waterborne polyurethane and the polyurethane composite material. According to the preparation method, isocyanate is introduced into a soft segment through a block process, an unsaturated chain extender is added, unsaturated double bonds are introduced, and waterborne polyurethane with excellent performance is prepared. Meanwhile, cellulose nanofibers are added into the unsaturated waterborne polyurethane, so that the interfacial compatibility and mechanical properties of the unsaturated waterborne polyurethane are improved. The unsaturated waterborne polyurethane provided by the invention has excellent film-forming property, stability and mechanical property.

The invention belongs to the technical field of acrylic plates, and particularly relates to a continuous casting high-hardness acrylic plate and a preparation method thereof.The preparation method comprises the steps that siloxane modified methacrylic acid, methyl methacrylate and n-butyl methacrylate are mixed, an azo initiator is added into the mixture, and then stirring and mixing are conducted to obtain pre-polymerized slurry; the preparation method comprises the following steps: mixing hydroxyl-terminated ether polysiloxane, isophorone diisocyanate and a catalyst dibutyltin dilaurate, reacting to obtain a macromolecular prepolymer, and then adding an end-capping reagent and a photoinitiator into the macromolecular prepolymer to obtain coating slurry; and injecting the pre-polymerized slurry between two annular steel belts which operate synchronously, coating the two annular steel belts with the coating slurry, and carrying out ultraviolet curing to obtain the high-hardness acrylic plate. Through ultraviolet curing, a high-hardness layer is formed outside the acrylic plate, polyurethane is modified by hydroxyl-terminated ether polysiloxane, the rigidity of a soft chain segment is improved by a polysiloxane chain segment, and the hardness of polyurethane is improved.

The invention relates to the technical field of secondary batteries, and discloses a secondary battery, a negative active layer in a negative plate comprises a negative active material and a negative adhesive, the negative active material comprises a silicon-based material, the negative adhesive comprises a polymer, and the raw material of the polymer comprises a hard segment monomer and a soft segment monomer; the electrolyte comprises carbonic ester substances and lithium salt; on the basis of the total mass of the raw materials of the polymer, the mass content of the soft segment monomer is r%; on the basis of the total mass of the electrolyte, the mass content of the carbonic ester substance is t%; t / r is greater than or equal to 0.234 and less than or equal to 1.770. According to the secondary battery provided by the invention, the chemical structure of the adhesive is optimized and the composition of the electrolyte solution is adjusted, so that the excellent electrochemical performance of the battery is ensured, the swelling effect of the electrolyte on the adhesive is reduced, the cycle life of the battery is prolonged, and the safety of the battery is improved.

The invention discloses high-strength and high-toughness carbon dioxide-based biodegradable polyester-polycarbonate and a preparation method thereof. The carbon dioxide-based polyester-polycarbonate composite material is prepared from 90 to 98 percent of carbon dioxide-based polyester-polycarbonate and 2 to 10 percent of a carbon dioxide-based polycarbonate or polyester-polycarbonate hard-soft-hard triblock structure elastomer. The hard segments at the two ends of the elastomer are a polycarbonate chain segment and a polyester chain segment containing rigid groups respectively, so that the elastomer has high glass transition temperature and good compatibility, and the situation that the two phases are incompatible is avoided; soft segments in the two elastomers are polycarbonate chain segments containing long-chain branches, and the soft segments have very low glass transition temperature, so that the effects of buffering stress and toughening are achieved. The special hard-soft-hard three-block structure elastomer is used as a toughening modifier, high-strength and high-toughness carbon dioxide-based biodegradable polyester-polycarbonate can be prepared, and good tensile strength and light transmittance are still kept while the toughness and the processing performance of the material are effectively improved.

The invention belongs to the technical field of 3D printing photocuring, and particularly relates to photocuring organic silicon modified polyurethane acrylate resin as well as preparation and application thereof. According to the invention, isophorone diisocyanate is used as a hard segment, polypropylene glycol-1000, dimethylolpropionic acid and dihydroxy-terminated silicone oil are used as soft segments, and the light-cured organic silicon modified polyurethane acrylic resin is synthesized with pentaerythritol triacrylate. By controlling the hydroxyl content in the double-terminal hydroxyl silicone oil and the proportion of the double-terminal hydroxyl silicone oil in a soft segment, the prepared organic silicon modified polyurethane acrylic resin has better flowability and light transmittance and higher double bond content; the organic silicon modified polyurethane acrylic resin, the acryloyl morpholine and the photoinitiator are cured according to a specific proportion, and the obtained elastomer has good mechanical properties and thermal stability and has high printing precision. The synthesized organic silicon modified polyurethane acrylate resin has the potential of replacing a traditional polyurethane acrylate material.

The invention discloses a polyamide elastomer as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. By reasonably controlling the covalent connection rate of the soft and hard sections of the polyamide elastomer and the types of the soft sections and the hard sections of the polyamide elastomer, the obtained polyamide elastomer is high in relative viscosity and excellent in mechanical property, rebound resilience, fatigue resistance and the like, and is suitable for preparing sports equipment, hoses, medical instruments and sealing materials.

The invention provides an adhesive with high adhesion strength for a low-surface-energy material as well as a preparation method and application of the adhesive, and relates to the field of materials. The adhesive comprises a fluorinated hard segment and a long polymer chain soft segment with a plasticizing effect, the fluorinated hard segment monomer corresponding to the fluorinated hard segment comprises a fluorinated methacrylate monomer; the soft segment monomer corresponding to the long polymer chain soft segment with the plasticizing effect comprises a polyether methacrylate monomer. The preparation method of the adhesive comprises the following steps: mixing the fluorinated hard segment monomer, the soft segment monomer and an initiator to obtain a precursor liquid; and carrying out polymerization reaction on the degassed precursor liquid, and then carrying out vacuum drying to obtain the adhesive. The adhesive provided by the invention has excellent bonding strength, does not need to carry out surface pretreatment on materials, reduces the production cost, and provides a new idea for the development of bonding of low-surface-energy materials.

The invention discloses a silane functionalized graphene oxide / waterborne polyurethane hydrophobic coating and preparation, and belongs to the technical field of paints.The silane functionalized graphene oxide / waterborne polyurethane hydrophobic coating is prepared by the steps that natural graphite powder serves as a raw material, and graphene oxide is prepared through a Hummer method; n-(beta-aminoethyl)-gamma-aminopropyl trimethoxy silane is grafted to the surface of the graphene oxide through a chemical reduction method, and GO-AATS composite filler is obtained; then, castor oil is used as a soft segment, isophorone diisocyanate is used as a hard segment, and a series of GO-AATS-WPU emulsions are prepared. According to the silane functionalized graphene oxide / waterborne polyurethane hydrophobic coating and preparation, chemical bonds are formed between graphene oxide and waterborne polyurethane, and the interfacial compatibility of graphene oxide and waterborne polyurethane is improved, so that the mechanical property, water resistance, corrosion resistance and thermal stability of the waterborne polyurethane coating are improved.

The invention discloses a sulfonate grafted polyether-polyester-polyamide block copolymer and a synthesis method thereof, and belongs to the field of materials. The invention provides a block copolymer elastomer material taking polycaprolactam as a hard segment and polyether and polyester as soft segments, and specific sulfonic acid groups are introduced to meet specific applications. According to the invention, caprolactam, 6-aminocaproic acid, aliphatic dibasic acid, aliphatic diamine, polyether glycol, sulfonate grafted polyester polyol BY-3305 and the like are used as raw materials, and macromolecular sulfonate grafted polyester polyol BY-3305 is used as a sulfonate grafting agent, so that the reaction efficiency is higher than that of a small molecular monomer containing a sulfonic acid group, and fewer reaction byproducts are generated; the polymerization reaction can be smoothly carried out. The sulfonate grafted polyether-polyester-polyamide block copolymer elastomer is obtained through one-step melt polymerization, and has the advantages of being simple and convenient in synthesis method, low in production cost, high in strength, adjustable in performance and the like.

The invention provides a polyurethane urea elastomer, a preparation method and application thereof, and an ionic conductive elastomer, and belongs to the field of polymer materials. A soft-segment substance, isocyanate and a catalyst are subjected to a prepolymerization reaction to obtain a prepolymer, the prepolymer, a chain extender and an organic solvent are subjected to a chain extension reaction to obtain the PUU elastomer, the soft-segment substance contains hydroxyl, and the chain extender contains phenyl and a bishydrazide substituent. According to the invention, PUU is synthesized by a chain extender simultaneously containing phenyl and a bishydrazide substituent, the phenyl in the PUU can be assembled in situ based on pi-pi interaction to form an aggregate, and the aggregate and multiple hydrogen bonds between amido urea bonds on two sides of the aggregate jointly form a double-lock hard domain which has high binding energy and is cross-linked based on non-covalent interaction in the PUU. The unique structure of PUU improves the mechanical properties, including strength, elasticity and tear resistance, of the material on one hand, and endows the material with a function of repairing mechanical damage on the other hand.

The invention discloses a supramolecular polyurethane prepolymer, supramolecular polyurethane prepolymer ink, a supramolecular polyurethane elastomer as well as a preparation method and application of the supramolecular polyurethane prepolymer. The structural formula of the supramolecular polyurethane prepolymer is as follows: # imgabs0 #; wherein m is 5-35, n is 6-28, and R is 2-acetyl benzene, phenyl or biphenyl. The supramolecular polyurethane prepolymer has multiple strong hydrogen bonds formed by allophanate bonds and carbamate bonds, microphase separation of soft and hard segments of polyurethane is promoted, the tightness of chain segment spatial conformation is increased by utilizing a planar structure of boron atoms, hydrogen bonds between the carbamate bonds are enhanced, and the microphase separation of soft and hard segments of polyurethane is promoted. The tensile strength, the thermal stability and the toughness of a 3D printed product are improved by virtue of multi-reinforcement coupling due to the dynamic characteristics of the boric acid ester bond, and the 3D printed product has excellent bearing capacity.

The invention discloses an oxide-enhanced, high-strength and high-temperature-resistant diaphragm and a preparation method thereof, and belongs to the technical field of battery diaphragms. The diaphragm is of a three-layer co-extrusion structure, a surface layer is composed of a block olefin polymer and a styrene elastomer, the block olefin polymer comprises soft chain segment polyethylene and hard chain segment polyolefin containing rigid groups, the styrene elastomer is a block copolymer with an (S) m-(P / B) n-(S) m microphase separation structure, and the thickness of the styrene elastomer is 1-10 micrometers. And the middle layer consists of high-density polyethylene and hydrophobically modified oxide. The preparation method comprises the following steps: synthesis of the block olefin polymer, three-layer co-extrusion sheet casting, two-way stretching, extraction drying, secondary transverse stretching and heat setting. Through molecular structure design and multiphase compounding, the mechanical strength, the membrane rupture temperature and the thermal stability of the diaphragm are synergistically improved, meanwhile, good electrolyte wettability and processing consistency are kept, the problems that a traditional wet-process diaphragm is poor in temperature resistance and insufficient in strength are effectively solved, and the safety of a lithium battery is remarkably improved.

The invention discloses a preparation method of a long-acting antistatic polymer master batch for skin-core spinning polyester, and relates to the technical field of high polymer material preparation. The hard segment comprises the following components: 100 parts of aromatic polyester, the aromatic polyester is generated through a reaction of 100 parts of an aromatic monomer and 80-120 parts of aliphatic dihydric alcohol, the aromatic monomer is dimethyl terephthalate, and the aliphatic dihydric alcohol is 1, 4-butanediol. Through cooperation of the hard segment structure, the soft segment structure, the polyaniline, the protonic acid, the ionic liquid, the fluorine-containing polymer and the sulfonate, the problems that the antistatic performance of the polyester master batch depends on environment humidity, the subsequent process is easy to lose efficacy, and the compatibility with a polyester matrix is poor are solved; the master batch can maintain a stable antistatic effect in a low-temperature and low-humidity environment, the performance of the master batch is not attenuated after subsequent procedures such as elasticizing and printing and dyeing, meanwhile, short filaments and broken filaments are avoided in the spinning process, and the continuity of polyester fiber production and the quality of finished products are improved.

The invention provides a polyamide elastomer and a preparation method thereof. The method comprises the following steps: (1) under the action of a first catalyst, carrying out condensation polymerization on a poly-diol compound and a binary acid monomer in a solvent to obtain an end-capping reagent; (2) under the action of a second catalyst, an end-capping reagent and a comonomer are subjected to a contact reaction, and a polyamide block is obtained; and (3) in the presence of a stabilizer and under the action of a third catalyst, carrying out contact reaction on the soft segment and the polyamide block to obtain the polyamide elastomer, wherein the polydihydric alcohol compound is polyalkylene ether glycol with the number-average molecular weight of 150-2000, and the stoichiometric ratio of the polydihydric alcohol compound to the binary acid monomer is 1: (2.0-2.4); the comonomer is C4-C12 lactam and / or C4-C12 amino carboxylic acid; and the soft segment is a hydroxyl-terminated diol polymer. According to the invention, the performance loss of the hard-segment-dominated material is not caused on the basis of improving the soft-segment-dominated material mechanical property of the product, and the polyamide elastomer product with excellent comprehensive performance is obtained.

The invention discloses a low-temperature-resistant adhesive as well as a preparation method and application thereof. The low-temperature-resistant adhesive is prepared from the following components in parts by mass: 39 to 43 parts of cashew nut oil modified phenolic resin, 28 to 31 parts of epoxy resin CYD128, 27 to 29 parts of hydrogenated butadiene-acrylonitrile rubber, 0.2 to 0.4 part of metal organic salt accelerant and 1 to 2 parts of curing agent. The cashew nut oil modified phenolic resin is prepared from cashew nut oil, phenol, formaldehyde, sodium hydroxide and phosphoric acid. The cashew nut oil with flexible long chain segments is adopted to synthesize the modified phenolic resin, the proportion of the soft chain segments in the epoxy resin is remarkably increased, the brittleness of a cured product at low temperature is effectively improved, the hydrogenated butadiene-acrylonitrile rubber is introduced, good combination of strength and ductility is achieved, and the adhesive is not prone to degumming and failure at low temperature.

The invention discloses an environment-friendly underwater sound absorption polyurethane composite material and a preparation method thereof, the environment-friendly underwater sound absorption polyurethane composite material comprises a prepolymer, a chain extender and a filler, the prepolymer is a polymer obtained by polymerizing polyether and diphenylmethane diisocyanate, and the NCO value of the polymer is 12-18%; the chain extender takes butanediol as a hard segment and polyether and polyether polyol as soft segments; the environment-friendly polyurethane composite material for underwater sound absorption is a sound absorption material which does not contain ricinoleic acid, oleic acid and linoleic acid, can avoid water body pollution caused by explosive propagation of ricinoleic acid, oleic acid and linoleic acid, is used for replacing an existing sound absorption material, and has the advantages that the environment-friendly polyurethane composite material for underwater sound absorption is good in sound absorption effect and good in sound absorption effect. And water pollution is prevented while sound is absorbed.

The invention belongs to the technical field of polylactic acid elastomers. The invention provides a covalent self-adaptive network cross-linked toughened polylactic acid polyurethane elastomer. The polylactic acid polyurethane elastomer is a cross-linked polyurethane elastomer of which the soft segment is dihydroxyl-terminated polylactic acid dihydric alcohol and the hard segment is a dynamic covalent bond-containing cross-linked polyurethane elastomer. The invention also provides a preparation method of the covalent self-adaptive network cross-linked and toughened polylactic acid polyurethane elastomer. The invention also provides application of the polylactic acid polyurethane elastomer in the fields of degradable medical implants and flexible electronics. The dynamic bond toughened cross-linked polylactic acid polyurethane is prepared from a low-molecular-weight polylactic acid dihydric alcohol derivative through a cross-linked structure in a manner of introducing a dynamic covalent bond, and has the advantages of intrinsic elasticity, high elongation at break, high toughness, biocompatibility, excellent self-healing property and recoverability.

The invention belongs to the technical field of biomedical materials, and particularly relates to a callus-imitating bone adhesive as well as a preparation method and application thereof. And carrying out second polymerization reaction on hydrogen atoms in the type I collagenous fibers and isocyanate groups in the callus-imitating polyurethane bone adhesive prepolymer to obtain the callus-imitating bone adhesive, wherein the callus-imitating polyurethane bone adhesive prepolymer is obtained by carrying out a polyaddition reaction on hydroxyl groups in nano-hydroxyapatite and isocyanate groups in a hexamethylene diisocyanate tripolymer, and the biocompatibility of the material is obviously improved through a novel biological soft segment, namely the I-type collagenous fiber. Meanwhile, in the polymerization process of the material, thermal infrared characterization shows that the material does not generate heat higher than the temperature of a human body and does not cause thermal damage to tissues.

The invention discloses high and low temperature resistant rubber and a preparation method thereof, and relates to the technical field of rubber materials. Polyurethane and ceramic aerogel are combined to form a semi-interpenetrating network to prepare the hybrid filler, amino groups on the surface of the aerogel react with isocyanate groups of the polyurethane to generate covalent bonds, polyether / polyester soft segments of the polyurethane serve as flexible chain segments, the movement ability of molecular chain segments is still kept at extremely low temperature, and the hybrid filler is prepared. Meanwhile, nanopores of the aerogel obstruct heat conduction of gas. Carrying out nucleophilic addition on phosphoric acid and epoxy groups of the hollow glass beads, and adding a hybrid filler into silicone rubber for modification; the phosphate group and a chain in the silicone rubber form a hydrogen bond; hydrogen bonds interact to form a polyurethane / aerogel / microbead three-dimensional interpenetrating network; the phosphate layer forms a pyrophosphate network at high temperature to delay thermal decomposition, and the hollow structure of the microbead absorbs thermal stress through deformation during low-temperature shrinkage to cooperate with the gas barrier effect in the microbead. The prepared rubber has the effects of high temperature resistance, low temperature resistance and flame retardance.

The invention relates to the technical field of flexible composite materials, in particular to an ultrathin flexible magnetic composite material and a preparation method and application thereof.The ultrathin flexible magnetic composite material comprises a polymer matrix and a composite absorbent, and the composite absorbent comprises samarium-iron-nitrogen magnetic powder subjected to surface treatment through phosphoric acid and a benzotriazole corrosion inhibitor, the core-shell structure complex is formed by ferroferric oxide nanoparticles and reduced graphene oxide through chemical bonding; a hyperbranched polyamide-amine dispersant; the polymer matrix is adopted, thermoplastic polyurethane / polydimethylsiloxane is used as a flexible framework, mechanical support and processing fluidity are provided, the glass transition temperature is lower than 25 DEG C, and it is ensured that the material keeps high flexibility at the room temperature. The soft segment of the thermoplastic polyurethane endows the material with elasticity, and the hard segment forms a physical crosslinking point to balance strength and flexibility; a silicon-oxygen bond structure of polydimethylsiloxane endows the material with low-temperature flexibility and chemical stability, and the material is suitable for sensitive scenes such as medical treatment.

Described herein are water-soluble, non-toxic, thermoplastic polyurethane compositions comprising reaction products of one or more aliphatic diisocyanate compounds, one or more higher molecular weight polyalkylene oxide compounds having a molecular weight of 600-150,000 g / mol and one or more low molecular weight diol chain extender compounds having a molecular weight of 50-300 g / mol, reacted in molar ratios of 50:49-20:1-30 and having a soft segment content of at least 80% and methods for their synthesis and use.

The invention belongs to the technical field of new energy materials, and particularly relates to a solid electrolyte material for a lithium battery and a preparation method thereof. The solid electrolyte material for the lithium battery is a polyurethane elastomer and consists of a polyether ion conduction soft segment and an isocyanate crosslinking hard segment, the soft segment is selected from polyether polyol and accounts for 66-90% of the total mass of the polyurethane elastomer; the hard segment is formed by reacting diisocyanate with a chain extender, and accounts for 10-34% of the total mass of the polyurethane elastomer; and the ether solvent is sealed in the soft segment phase by the polymer network. The polyurethane elastomer disclosed by the invention has high ionic conductivity, excellent mechanical property and good interface compatibility, and can be suitable for different types of lithium batteries, such as lithium ion batteries, lithium metal batteries, high-voltage lithium ion batteries and the like; and the preparation process is simple and suitable for large-scale industrial production.