216 results about "Hyperbranched polymers" patented technology

The invention provides a modified polyimide fiber and a preparation method and application thereof, and the preparation method comprises the following steps: S1, adding a polyimide fiber into an alkali solution for reaction, cleaning a reactant with acid and alkaline alcohol, and drying to obtain an activated polyimide fiber; s2, adding the activated polyimide fiber into an alkaline alcohol solution, adding into a first silane coupling agent, carrying out modification reaction, adding modified epoxy resin, and mixing to obtain a bottom layer component; s3, adding the activated polyimide fiber into an alkaline alcohol solution, adding a second silane coupling agent and a hyperbranched polymer, and carrying out a modification reaction to obtain a surface layer component; and S4, covering the bottom layer component with the surface layer component, drying to obtain the modified polyimide fiber, and optimizing the coating to obtain the modified polyimide fiber with high mechanical property, excellent atomic oxygen resistance and ultraviolet resistance and environmental adaptability.

The invention relates to the technical field of rubber, and relates to a wear-resistant rubber composite material and a preparation method thereof. The wear-resistant rubber composite material is prepared from the following components in parts by weight: 100 parts of a rubber matrix, 30 to 60 parts of multi-stage core-shell structure composite filler, 10 to 15 parts of carbon black, 1.0 to 2.5 parts of a vulcanizing agent, 0.5 to 2.0 parts of an accelerant, 3 to 6 parts of an active agent and 1 to 3 parts of an anti-aging agent, the multi-stage core-shell structure composite filler sequentially comprises a rigid inorganic nano-particle core, a rigid inorganic nano-particle core and a rigid inorganic nano-particle core from inside to outside, the core is coated with the first shell layer, the first shell layer is a mesoporous silica layer, and a silane coupling agent containing sulfur groups is modified in the mesoporous silica layer; and the second shell layer is coated outside the first shell layer and is a hyperbranched polymer layer. According to the wear-resistant rubber composite material provided by the invention, the comprehensive mechanical property and wear resistance of the rubber composite material are improved.

The invention provides high-grinding-efficiency color paste, a preparation method thereof and dispersed ink, and belongs to the technical field of dispersed ink, and the high-grinding-efficiency color paste comprises the following components in percentage by weight: 15%-30% of disperse dye toner, 15%-25% of a dispersing agent, 5%-15% of resin ammonium salt, 10%-20% of a dissolution promoting mixture, 0.5%-2% of a wetting agent and the balance of water; the dispersing agent comprises a hyperbranched polymer and a sodium naphthalene sulfonate improved polymer; the hyperbranched polymer takes a benzene ring as a center, hydrophobic groups and hydrophilic groups on a branched chain are randomly distributed, the hydrophilic groups of the branched chain comprise carboxylate and sulfonate, and the hydrophobic groups of the branched chain comprise alkane, ester and aryl. According to the invention, the hyperbranched polymer and the sodium naphthalene sulfonate improved polymer are mixed with the dispersing agent, so that the problem of abrupt change of ink viscosity can be avoided when the content of ink toner is relatively high, thereby obtaining the color paste with strong dispersion and high stability, and further obtaining the dispersed ink with good stability.

The invention discloses a solid electrolyte membrane, a preparation method and a lithium battery. The solid electrolyte membrane comprises a polymer electrolyte, the structure of the polymer electrolyte is a hyperbranched polymer, a molecular chain of the polymer electrolyte contains a polyoxyethylene chain segment, ether oxygen atoms in an amorphous phase region can form coordination with lithium ions, migration of the lithium ions is facilitated, and the ionic conductivity of the solid electrolyte membrane is improved; besides, a nitrogen and sulfur element annular structure is introduced into the hyperbranched polymer, so that the mechanical strength of the solid electrolyte membrane can be effectively improved, the ionic conductivity of the solid electrolyte membrane can be further improved, the interface impedance can be reduced, and the comprehensive performance of the battery on safety performance and electrical performance is improved.

According to the dispersing agent for the positive electrode slurry, the positive electrode slurry, the positive plate and the electrochemical device, the dispersing agent comprises a solvation chain segment, the solvation chain segment is a hyperbranched polymer, and a terminal unit of the hyperbranched polymer is an electronegative group. According to the dispersing agent for the positive electrode slurry, provided by the invention, the hyperbranched polymer with an electronegative terminal group is used as a solvation chain segment, and a high-density terminal functional group is provided through a hyperbranched structure, so that the anchoring capability and the space stabilization effect on a positive electrode active material are remarkably enhanced; meanwhile, by utilizing the electrostatic repulsion effect of electronegative groups and the surface of the positive electrode material, the dispersion stability of the slurry is effectively improved, and sedimentation and agglomeration are inhibited.

A hyperbranched polymer and a preparation method therefor and the use thereof. The hyperbranched polymer comprises a structural formula of formula 1, wherein R is selected from a substituted or unsubstituted C12-C18 alkyl. The hyperbranched polymer, which is used as a demulsifier for demulsifying crude oil emulsions, exhibits a high demulsification efficiency, a low usage amount, a low demulsification temperature, a high acid and alkali resistance, and a high salt resistance. The demulsifier has a high demulsification performance in oil-water emulsions with various properties.

The invention discloses a robot simulation skin and a preparation method of the robot simulation skin. The formula of the robot simulation skin is composed of 100 parts of an organosilicon polymer with a main chain containing double bonds, 30-45 parts of a hyperbranched phenyl silicone oil plasticizer, 5-18 parts of a nanoscale texture conditioning agent, 7-22 parts of a dynamic crosslinking system and 1.5-9 parts of a function response additive. Through cross-scale cooperation of an organosilicon polymer matrix and functional components, a conformational entropy buffer network of a hyperbranched plasticizer is constructed on a molecular level, a light-force energy flow channel decoupling mechanism of a core-shell regulator is formed on a mesoscopic level, space-time regulation and control of gradient crosslinking and photo-thermal response are realized on a macroscopic level, and meanwhile, the cross-scale cross-linked hyperbranched polymer has good application prospects. The physical essence of inherent contradictions of'high-temperature softening-low-temperature embrittlement 'and'light transmittance-elasticity mutual exclusion' of existing silica gel skin is broken through, and the sensitivity of conformation entropy change to temperature is reduced through the molecular topology confinement effect.

The invention belongs to the technical field of modified plastics, and particularly relates to a high-reflection low-transmittance polypropylene composite material as well as a preparation method and application thereof. The invention provides a novel polypropylene composite material formula, which comprises homo-polypropylene, precipitated barium sulphate, hollow glass beads, maleic anhydride grafted polypropylene and a hyperbranched polymer dispersant, through selection and synergistic effect of the specific components, the reflectivity of the obtained polypropylene composite material is significantly improved, the light transmittance is greatly reduced, and the polypropylene composite material has a good application prospect. Good mechanical properties and high-whiteness surface appearance are kept, and the high-whiteness optical fiber can be widely applied to the field of various optical products.

The invention relates to the technical field of epoxy resin preparation, and particularly discloses a modified epoxy resin packaging material and a preparation method thereof.The modified epoxy resin packaging material is prepared from, by weight, 96-130 parts of resin matrix, 14-16 parts of heat conduction filler, 9-12 parts of composite flame retardant, 4.6-5.6 parts of curing accelerator, 1.2-1.4 parts of photoinitiator and 440-500 parts of solvent; the hydroxyl-terminated hyperbranched polymer and the heat-conducting filler are added into the modified epoxy resin packaging material, and the polymer contains rich active hydroxyl, benzene rings,-Si-O-Si bonds and sulfydryl, not only can be subjected to a curing reaction with bisphenol A epoxy resin, but also can be subjected to a reaction with the heat-conducting filler, so that the heat-conducting property of the heat-conducting filler is improved; the overall crosslinking density of the modified epoxy resin packaging material is improved, the dispersity of the heat-conducting filler is improved, the heat conductivity is improved, and meanwhile the ablation resistance and the mechanical property of the modified epoxy resin packaging material are improved.

The invention provides a nylon composite material as well as a preparation method and application thereof, and belongs to the technical field of nylon composite materials. The nylon composite material comprises the following raw materials in parts by mass: 35-75.5 parts of nylon resin; 20 to 40 parts of glass fiber; 2-15 parts of a wear-resistant agent; 1 to 5 parts of silicone; 1-5 parts of a compatilizer; 0.5 to 1 part of an antioxidant; 0.5 to 1.5 parts of a lubricant; 0.5 to 1.5 parts of a coloring agent; the wear-resistant agent comprises more than one of ultra-high molecular weight polyethylene, a hyperbranched polymer, polytetrafluoroethylene and silicone oil. The nylon composite material is prepared by compounding the nylon resin, the glass fiber, the wear-resistant agent, the silicone, the compatilizer, the antioxidant, the lubricant and the coloring agent, so that the wear resistance and the melt strength of the nylon composite material are remarkably improved, meanwhile, the nylon composite material has excellent machinability and mechanical properties, the machinability and the dimensional precision of wear-resistant products can be improved, the service life of the wear-resistant products can be prolonged, and the processing efficiency can be improved.

The invention relates to the field of polymer composite materials and functional films, and provides a cast film for a lithium ion battery, which is characterized in that the cast film is of a laminated composite structure, and the laminated composite structure comprises a support layer and an interface functional layer; the supporting layer comprises polymer fibers and boron nitride nanosheets which are dispersed in a three-dimensional network of the polymer fibers in a highly oriented manner; wherein the included angle between the plane normal direction of the boron nitride nanosheet and the thickness direction of the cast film is less than 30 degrees; the interface functional layer comprises a hyperbranched polymer matrix and LLZO nanowires which are distributed in the hyperbranched polymer matrix in a gradient manner; the surface, deviating from the supporting layer, of the interface functional layer is grafted with a zwitterionic polymer brush through chemical bonding; wherein the surface density of the LLZO nanowire is gradually reduced from the surface, grafted with the zwitterionic polymer brush, of the interface functional layer to the direction of an interface combined with the supporting layer; the cast film has good electrochemical performance, interface stability and safety performance.

This invention provides a high weather-resistant three-color paint and its preparation method. The high weather-resistant three-color paint includes a white primer, a red primer, a blue primer, a topcoat, a clear coat, and a curing agent. Modified silica is added to the white primer, red primer, blue primer, topcoat, and clear coat. The modified silica is obtained by copolymerizing hydroxyl hyperbranched polymer-coated nano-silica, 2,4-dihydroxybenzophenone-grafted cyanuric chloride, and hydroxyl acrylate. This modified silica possesses a three-dimensional cross-linked network structure, which directly enhances the mechanical properties of the paint film. It also incorporates abundant ultraviolet absorbing groups, significantly improving the weather resistance of the paint film. Simultaneously, the large number of active hydroxyl groups it contains enhances the adhesion of the paint film. During the curing process, the isocyanate groups of the curing agent combine with the hydroxyl-containing components in the system to form a highly integrated and dense paint film structure, further improving the mechanical properties, weather resistance, and optimizing acid and alkali resistance of the paint film.

The invention discloses a preparation method and application of hyperbranched polymer toughened epoxy resin and a secondary recycling method of the epoxy resin, and relates to the technical field of epoxy resin. The invention aims to solve the problems that the traditional thermosetting epoxy resin is difficult to recover and the toughness of the recovered thermosetting epoxy resin does not reach the standard. The method comprises the following steps: mixing the epoxy resin degradation product, the bisphenol A epoxy resin, the anhydride curing agent and the hyperbranched siloxane polymer, and stirring for 30-45 minutes at the temperature of 80-100 DEG C; adding a tertiary amine accelerant, uniformly mixing, and injecting into a mold; the mold is placed in a vacuum environment at the temperature of 60-80 DEG C for defoaming, curing is conducted for 1.8-2 h at the temperature of 120-130 DEG C, then the temperature is increased to 150-160 DEG C, and curing continues to be conducted for 1.8-2 h. The invention can obtain the preparation method and the application of the hyperbranched polymer toughened epoxy resin and the secondary recycling method of the epoxy resin.

The invention discloses a transition metal ion chelated polymer electrolyte, a preparation method and an electrochemical device. The polymer electrolyte is a mixture of a styrene-maleic anhydride grafted hyperbranched polymer and an alkali metal salt of a functional compound, and the styrene-maleic anhydride grafted hyperbranched polymer is prepared on the basis of a polyamine branched polymer and a styrene-maleic anhydride copolymer. The functional compound is a polydentate ligand containing a carboxylic acid group and a nitrogen-containing aromatic heterocyclic structure unit or an arylamine structure unit, and the alkali metal salt is a lithium salt or a sodium salt. According to the invention, the functional compound containing the carboxylic acid group and the nitrogen-containing aromatic heterocyclic ring or arylamine is used as a carrier of the alkali metal ions and a scavenger of the transition metal ions at the same time, so that the cross pollution source of the transition metal ions is eliminated; meanwhile, the ionic conductivity and safety of the electrochemical device are improved by utilizing the coordination of a three-dimensional network of the polymer and a molecular trap of the functional compound, and the dendritic crystal strength is inhibited, so that the interface stability of the electrode is improved.

The invention discloses a photovoltaic water-blocking and oxygen-blocking butyl rubber, the photovoltaic water-blocking and oxygen-blocking butyl rubber is composed of butyl rubber, polyisobutene and a functional auxiliary agent, the functional auxiliary agent at least contains a hyperbranched polymer, and the tail end of the hyperbranched polymer is vinyl. The photovoltaic water-blocking and oxygen-blocking butyl rubber has the characteristics of good component compatibility, good water-blocking and oxygen-blocking performance and good anti-aging performance.

The invention discloses a flame-retardant wear-resistant epoxy resin cable material and a preparation method thereof, and relates to the technical field of cable sheaths and insulating materials. The formula comprises bisphenol A epoxy resin, a curing agent, a hyperbranched polymer, a reactive nano mica sheet, phosphorus-nitrogen flame-retardant core-shell microspheres, an accelerant and a wetting dispersant. According to the invention, the technical contradiction that the toughness, wear resistance and flame retardance of the epoxy resin are difficult to synergistically improve is effectively improved by using the three self-prepared components, namely the hyperbranched polymer containing the dynamic disulfide bond, the nano mica sheet of which the surface is grafted with the liquid crystal unit and the phosphorus-nitrogen flame-retardant microsphere with the core-shell packaging structure. The material disclosed by the invention has high toughness, high wear resistance and excellent flame retardance while keeping good processability and electrical insulating property, and is suitable for sheaths and insulating layers of high-performance cables.

The invention discloses an electronic product rear cover with burnt-out textures and a preparation method thereof, and relates to the technical field of electronic product rear covers, burnt-out cloth is adopted, the burnt-out cloth has rich colors and texture patterns, the specific colors and patterns can be set through lasers according to needs, pattern printing is not needed, and the production efficiency can be improved. According to the application, the glass fiber cloth is soaked in the modification treatment liquid containing the sulfydryl-terminated hyperbranched polymer for click reaction, so that the sulfhydrylated glass fiber cloth is prepared, and the strength of the glass fiber layer is improved. The connecting layer is the modified epoxy resin, and the modified epoxy resin improves the bonding strength between the connecting layer and the glass fiber layer and between the connecting layer and the scratch-resistant layer. And the impact resistance of the electronic product rear cover is improved, so that the stress dispersion is better realized.

The invention discloses a microwave curing-based coating material and a preparation method thereof. The microwave curing-based coating material comprises mixed resin, a microwave absorbing material, cellulose ether, a curing agent, a hyperbranched polymer, an active monomer, polyglycol modified epoxy acrylate, o-cresol glycidyl ether, p-hydroxyanisole, a plasticizer and an accelerant. During preparation, the mixed resin, the hyperbranched polymer, the active monomer, the polyglycol modified epoxy acrylate and the o-cresol glycidyl ether are mixed and stirred, the p-hydroxyanisole, the plasticizer and the accelerant are sequentially added and stirred, the microwave absorbing material and the cellulose ether are added and stirred, and the curing agent is added and stirred. The coating material disclosed by the invention can be quickly cured within dozens of seconds to dozens of seconds based on a microwave condition, has good corrosion resistance and adhesive property, and fundamentally and effectively solves the problem of high shrinkage rate generally existing in the adoption of the existing light-cured resin.

The present application relates to a kind of hyperbranched polymer, nano preparation and its preparation method and application, belong to functional medical material and nanotechnology field.The hyperbranched polymer of the present application can be broken in ROS environment Release dihydrolipoic acid, play the role of antioxidant, be reduced to lipoic acid in vivo, and then play its role as coenzyme, participate in mitochondrial tricarboxylic acid cycle, restore mitochondrial function, thereby play the role of antioxidant and play the role of treating ischemic stroke.The nano preparation provided by the present application can be quickly distributed to brain in a short time, temporarily increase the paracellular permeability of BBB by inhibiting the expression of multi-drug resistance protein P-gp and ATP-dependent drug efflux protein on BBB, and the process of opening BBB by borneol is physiological and reversible, without destroying the structural integrity of blood-brain barrier.

This application relates to a process for preparing a filled wax-free adsorption pad, which is obtained by the following method: Step 1) PE foam material is foamed to form a porous structure of several foam skins; a modified PE board has several slots; Step 2) Adhesive is applied to the surface of the foam skins, and then the adhesive side of the foam skins is attached to the slots of the modified PE board, with the foam skins and slots corresponding one-to-one, and fixed to obtain a filled wax-free adsorption pad; both the PE foam material and the modified PE board contain an acid-resistant blend modifier; the acid-resistant blend modifier is composed of nano-lithium-based inorganic bentonite, polystyrene-poly(heptaisobutyl cage-type polysilsesquioxane alkylpropyl-methacrylate), maleic anhydride graft, and aromatic polyamide hyperbranched polymer. The filled wax-free adsorption pad obtained by the above technical solution ensures basic performance, further improves acid resistance, reduces wear, breakage, swelling, etc., and improves service life.

The invention provides a method for removing heavy metals by acidizing bleaching earth. The heavy metals in the bleaching earth are removed by using a heavy metal adsorbent. Firstly, acrylate reacts with diethanol amine to generate an esterification product, then the esterification product reacts with trimethylolpropane to form a hydroxyl-terminated hyperbranched polymer, and then the hydroxyl-terminated hyperbranched polymer reacts with isocyanate acrylate to introduce double bonds to obtain hyperbranched acrylate. Meanwhile, sodium alginate reacts with 4-chlorophenylboronic acid to obtain boric acid modified sodium alginate, then the boric acid modified sodium alginate reacts with tannic acid to introduce a large amount of hydroxyl groups, and finally the boric acid modified sodium alginate reacts with 3-aminopropanol vinyl ether to introduce double bonds, so that the sodium alginate compound containing double bonds is prepared. And copolymerizing the two monomers with acrylic acid, N-(2-aminoethyl) acrylamide and 2-acrylamido-2-methylpropanesulfonic acid to obtain the adsorbent with a three-dimensional network structure and multiple functional groups. Through the treatment, the heavy metal content of the bleaching earth is obviously reduced, no foreign impurities exist, and the functions of high decolorization rate and strong adsorbability are reserved.

The invention relates to a polymer blend for electrostatic spinning, a degradable microfiber filtering material and a preparation method and application thereof. The polymer blend for electrostatic spinning comprises a polymer and a plasticizer, and the plasticizer is a hyperbranched polymer. In the electrostatic spinning process, through addition of the hyperbranched polymer and spinning process control, the high-efficiency and low-resistance microfiber filtering material which is free of thermal bonding among fibers, has a fluffy three-dimensional network structure and has certain mechanical properties is prepared. The preparation process is simple, the preparation of the microfiber filtering material can be realized under relatively low spinning voltage, and the safety and the economical efficiency of the spinning process are improved; the filtering material has a wide application prospect in the fields of masks, protective clothing, operating gowns, air purification, especially high-efficiency air filtration under the action of a certain external field force.

The invention relates to a preparation method of a hyperbranched polymer containing phthalic dicarboxaldehyde, which comprises the following steps: dissolving a chain transfer agent, a monomer ADP containing a phthalic dicarboxaldehyde protecting group, dimethylacrylamide and azodiisobutyronitrile in tetrahydrofuran, and reacting for 8-24 hours at 70 DEG C in an inert atmosphere; cooling to normal temperature, adding trifluoroacetic acid, and continuously reacting for 1-3 hours; and stopping the reaction and precipitating, and then drying in vacuum to obtain the hyperbranched polymer containing o-phthalaldehyde. The hyperbranched polymer prepared by the invention can be efficiently cross-linked and fixed with sclera collagen, and is used for intervention treatment of myopia progress.

The invention provides damp-heat-resistant flame-retardant polyurethane and a host-guest chemical preparation method thereof, hyperbranched polyethyleneimine reacts with aldehydes to obtain a Schiff base structure, and then an organic hydrogen phosphate compound reacts with the Schiff base structure to synthesize a phosphorus-containing hydrophobic shell-hydrophilic core hyperbranched polymer. A phosphate flame retardant is embedded in the obtained amphiphilic hyperbranched flame-retardant polymer to form a flame-retardant complex by utilizing a host-guest coated hydrophilic-hydrophobic interaction principle, and the complex is blended with polyurethane to obtain a modified polyurethane material. The modified polyurethane can effectively inhibit precipitation of phosphate flame retardants, so that the material has excellent flame retardance and humidity and heat resistance, and a flame-retardant complex of the flame-retardant polyurethane has good compatibility with the polyurethane, so that the material has good transparency.

The application relates to the technical field of lithium ion batteries, in particular to a carbon nanotube graphene composite conductive agent and a preparation method thereof and a lithium ion battery, wherein the carbon nanotube graphene composite conductive agent comprises the following raw materials in parts by weight: modified graphene 1.5-3 parts, carbon nanotubes 7-9 parts, a surfactant 1.2-3.2 parts and N-methyl pyrrolidone 85-95 parts; the modified graphene is prepared by grafting hyperbranched polymers on the surface of graphene oxide and then reducing; the modified graphene has the advantages of improving the dispersibility of graphene and carbon nanotubes, thereby improving the conductive performance of the carbon nanotube graphene composite conductive agent.

The application relates to an oil-displacing demulsifier and a preparation method thereof. First, magnetic carbon nanotubes are prepared by depositing ferric chloride hexahydrate and copper sulfate pentahydrate on the surface of carbon nanotubes; second, hyperbranched polymers with terminal double bonds are prepared; then, the two are mixed to obtain hyperbranched grafted magnetic carbon nanotubes; finally, allyl polyoxyethylene ether is continuously polymerized in situ to obtain the oil-displacing demulsifier. The oil-displacing demulsifier prepared by the application is suitable for oil-displacing demulsification treatment of coking wastewater in the early stage. The coking wastewater is complex in composition, contains little oil, but contains a lot of organic components. The polyether with multiple branched chains can form a net trapping effect in the water body, so that oil and water can be quickly gathered and separated in an emulsified state, and the oil removal rate can reach more than 97%. Meanwhile, the demulsifier has magnetism, can be recycled through magnetic separation, and the oil removal rate can still reach more than 92% after ten cycles of demulsification. The oil removal effect is good with a small amount of addition, and the coking wastewater treatment process is simplified.

The invention provides a hyperbranched polymer as well as a preparation method and application thereof, the hyperbranched polymer has a structural formula as shown in formula 1, and R1, R2, R3 and R are independently selected from C8-C22 alkyl and C8-C22 alkenyl respectively. The hyperbranched polymer provided by the invention is used as a demulsifier, is applied to demulsification of crude oil emulsion, and has the advantages of high demulsification efficiency, low usage amount, low demulsification temperature, high acid and alkali resistance and high salt resistance.

The invention relates to the technical field of biological pharmacy, in particular to a method for extracting bile acid from pig bile, which comprises the following steps: (1) taking the pig bile, adjusting the pH value of the pig bile to be alkaline, heating the pig bile to 80-90 DEG C, stirring at constant temperature for 25-35 minutes, then cooling to room temperature, and adjusting the pH value of the system to be neutral to obtain pretreated pig bile; (2) filtering the pretreated pig bile in the step (1) by using a hyperbranched polymer film, concentrating filtrate under reduced pressure, adding an ethanol solution, heating to reflux, stirring for 25-35 minutes, and then filtering to obtain a crude bile acid product; and (3) adding a hydrochloric acid solution into the crude bile acid product in the step (2), adjusting the pH value to 2-3, centrifuging, filtering, washing and drying the obtained solid, adding ethyl acetate, heating to reflux until the solid is dissolved, cooling to room temperature, stirring for 2-4 hours, recrystallizing, separating and drying to obtain the bile acid. The extraction method is simple, and the extraction purity is high.

This invention provides a method for accelerating the crystal form transformation of isotactic polybutene-1 and the isotactic polybutene-1 resin prepared therefrom. The method includes blending isotactic polybutene-1, a hyperbranched polymer, and an optional antioxidant, followed by melt treatment, extrusion granulation, and storage. The hyperbranched polymer is selected from at least one of aliphatic and aromatic hyperbranched polymers. This invention is the first to propose a method for accelerating the crystal form transformation of isotactic polybutene-1 using a hyperbranched polymer. This method mainly utilizes the internal lubrication effect of the hyperbranched polymer to accelerate the rate of polymer chain conformation adjustment and chain rearrangement during the crystal form transformation of isotactic polybutene-1, thereby significantly improving the crystal form transformation rate. The method of this invention can shorten the time for isotactic polybutene-1 to transform from crystal form II to crystal form I from 7 days to within 2-4 days, showing good prospects for industrial application.

The invention relates to a super-hydrophilic anti-fog coating based on an amphiphilic bottom layer and a preparation method of the super-hydrophilic anti-fog coating, and belongs to the technical field of polymer functional coatings. The invention aims to solve the problems of poor adhesive force, short antifogging time and insufficient durability of the existing antifogging coating. The surface of a base material is coated with an amphiphilic bottom layer composed of a hyperbranched polymer, then the base material with the bottom layer is soaked in a reductive metal ion solution, metal ions permeate into the bottom layer, then the base material is soaked in a deoxidized super-hydrophilic monomer solution, monomer polymerization is catalyzed in situ through the metal ions, and the super-hydrophilic polymer is obtained. A super-hydrophilic surface layer grows from the interior of the bottom layer. According to the method, through the composite structure of the bottom layer and the surface layer, the lasting anti-fog performance of the coating in a high-humidity environment is guaranteed, the overall adhesive force and the swelling resistance are improved, meanwhile, the coating is suitable for a base material in a complex shape through the thixotropic characteristic of the hyperbranched bottom layer and a surface initiation technology, and synergistic improvement of the anti-fog performance, the durability and the technology adaptability is achieved.