869 results about "Benzophenone" patented technology

The invention discloses a photo-thermal aging resistant polyester composite material and a preparation method thereof, a modified monomer, a modified filler, benzophenone, terephthalic acid and neopentyl glycol are subjected to esterification condensation polymerization to prepare the composite material, and the modified monomer is added, so that the prepared polyester molecule is of a branched structure; the side chain of a polyester molecule and the surface of the modified filler both contain unsaturated double bonds which can react after being irradiated by ultraviolet light, so that the number of crosslinking points of the composite material is increased, the crosslinking density is further improved, and the anti-aging effect of the material is further improved; the modified filler can improve the high-temperature-resistant effect of the composite material, the modified filler is matched with the hindered phenol structure of the side chain to further improve the heat aging-resistant effect of the composite material, hydroxyl and ketone groups on the modified filler form intramolecular hydrogen bonds, light energy can be converted into heat energy to be released, and then the light aging-resistant effect of the composite material is improved.

The invention discloses a synthetic method of a water soluble ultraviolet light absorber BP-9. The method mainly comprises the following process steps: (1) carrying out methylation on the main raw materials of 2, 2', 4, 4'-tetrahydroxyl benzophenone, a transition metal salt catalyst and a mixed solvent which is prepared from dichloroethane and anhydrous ethanol in equal parts by weight to obtain 2, 2'-dihydroxyl-4, 4'-dimethoxyl benzophenone; (2) carrying out sulfonation reaction on the main raw materials of methylate, sulfamic acid and C1-C3 halohydrocarbon to obtain 2, 2'-dihydroxyl-4, 4'-dimethoxyl benzophenone-5, 5'-disulfonic acid; and (3) carrying out neutral reaction on the main raw materials of sulfonated product, inorganic base and ethanol water to finally obtain the BP-9 product. The synthetic method disclosed by the invention is few in reaction step, low in cost, high in product purity and stable in quality, and raw materials are easily available.

The invention discloses a modified polysiloxane coating for a stainless steel pot and a preparation method of the modified polysiloxane coating, and belongs to the technical field of polysiloxane coatings. Comprising the following raw materials in parts by weight: 60-70 parts of hydroxyl polydimethylsiloxane, 20-30 parts of acrylate resin, 15-20 parts of ethanol, 25-30 parts of deionized water, 6-18 parts of modified nano aluminum oxide, 2-4 parts of a friction reducing agent, 0.2-0.4 part of benzophenone and 1-3 parts of a flatting agent. Polysiloxane is used as a main component, so that the coating is endowed with excellent heat resistance; wherein the antifriction agent can improve the wear resistance of the coating; wherein the leveling agent improves the surface flatness of the coating; wherein the modified nano aluminum oxide has good compatibility with polysiloxane, is not easy to agglomerate in the coating, has good dispersity, and can greatly improve the heat resistance, hardness and easy-to-clean property of the coating; the performance is stable and the service life is long; the method has important application value in the technical field of polysiloxane coatings.

The invention discloses a skin-friendly antibacterial spinning yarn and a preparation method thereof, and relates to the field of spinning yarns. When the skin-friendly antibacterial spinning yarn is prepared, 3-amino-1, 2, 4-triazine and vinyl phosphonyl chloride are subjected to a reaction, and a phosphorus-nitrogen flame-retardant monomer is obtained; activating bamboo nano-cellulose with ammonium ceric nitrate, grafting a phosphorus-nitrogen flame-retardant monomer, and performing electrostatic spinning to obtain modified bamboo nano-cellulose coated fibers; dipping polyester filament yarns in dopamine hydrochloride and sodium hypochlorite in sequence to obtain modified polyester core yarns; the modified bamboo nano-cellulose wrapping fiber and the modified polyester core yarn are twisted through a ring spinning frame and then react with 3, 3 ', 4, 4'-benzophenone tetracarboxylic dianhydride, and the skin-friendly antibacterial spinning yarn is obtained. The skin-friendly antibacterial spinning yarn prepared by the method has excellent skin-friendly antibacterial property, flame retardance, aging resistance and mechanical property.

The invention belongs to the technical field of coatings, and relates to a polysiloxane epoxy hybrid environment-friendly coating and a preparation method thereof. The coating belongs to an environment-friendly solvent type coating with low VOC content, modified epoxy resin is adopted as a base, auxiliaries such as a film-forming agent and a dispersing agent are added, and benzophenone and tertiary amine composite photoinitiator is supplemented, so that the prepared coating has good corrosion resistance, high temperature resistance and the like, and the coating can quickly form a film at normal temperature and under the UV illumination condition, shortens the curing period, and is suitable for large-scale popularization and application. The emission of VOC (volatile organic compounds) is reduced.

The invention discloses an impact-resistant packaging material and a preparation method thereof, and relates to the technical field of packaging materials. When the impact-resistant packaging material is prepared, the zinc oxide-loaded porous silicon dioxide microspheres and the phosphorus-silicon synergistic flame retardant react to prepare functionalized porous silicon dioxide microspheres; the preparation method comprises the following steps: reacting 4-[2, 2 ': 6', 2 ''-terpyridyl]-4 '-yl-benzylamine with ethyl acrylate to prepare a terpyridyl diester monomer; the preparation method comprises the following steps: carrying out condensation polymerization on ethylene glycol, a terpyridyl diester monomer and benzophenone-4, 4 '-diethyl diformate to prepare functional polyester; the functionalized polyester and 2-aminoethyl-2-cyanoacetate are subjected to a reaction, and modified polyester is prepared; and carrying out melt blending on the modified polyester, the functionalized porous silicon dioxide microspheres, zinc chloride and 1, 6-dichlorohexane, and carrying out compression molding to obtain the impact-resistant packaging material. The impact-resistant packaging material prepared by the invention has excellent anti-aging, impact-resistant, flame-retardant and antibacterial properties.

The invention relates to the field of lithium ion batteries, in particular to a fluorine-containing soluble polyimide adhesive special for a lithium battery and a preparation method and application of the fluorine-containing soluble polyimide adhesive. The fluorine-containing polyimide is prepared by reacting dianhydride and diamine, the dianhydride comprises 3, 3 ', 4, 4'-benzophenone tetracarboxylic dianhydride, the diamine comprises 4, 4 '-bis (4-amino-2-trifluoromethylphenoxy) biphenyl and 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane, the structure of the fluorine-containing polyimide in the adhesive is as shown in a formula I: # imgabs0 #, and the fluorine-containing polyimide in the adhesive is fluorine-containing polyimide. The groups A and B are independently selected from # imgabs 1 # or # imgabs 2 #, and A is different from B. The adhesive is applied to a lithium ion battery, especially a silicon negative electrode lithium ion battery, shows excellent rate capability and adhesive performance, and has a good industrial prospect.

The invention discloses a super-smooth, anti-corrosion and anti-coagulation hydrogel composite coating on the surface of a medical instrument as well as a preparation method and application of the super-smooth, anti-corrosion and anti-coagulation hydrogel composite coating, and the super-smooth, anti-corrosion and anti-coagulation hydrogel composite coating is a surface hydrogel composite coating formed by taking N-(3, 4-dihydroxyphenethyl)-2-benzoylbenzamide (BPDA) as a primer and grafting a hydrophilic polymer on the primer. BPDA is deposited on the surface of the substrate, then hydrophilic monomer surface graft polymerization is initiated by light, and a hydrogel coating is constructed on the surface of the BPDA substrate. The BPDA primer provides excellent corrosion resistance, the corrosion rate of a metal substrate is effectively reduced, and benzophenone derivatives with photoreaction activity on BPDA molecules can mediate firm combination of the hydrogel layer; after meeting water, a stable and compact hydrated layer is formed, the super-lubricating property is achieved, adhesion of protein and cells can be remarkably inhibited, and thrombus formation is effectively prevented. The anti-corrosion and anti-blood coagulation coating has excellent anti-corrosion and anti-blood coagulation properties, and is widely applicable to anti-blood coagulation and anti-corrosion surface modification in the fields of medical instruments and the like.

The invention discloses a process for preparing flame-retardant polyethylene plastic by recycling waste polyethylene plastic, and relates to the technical field of high polymer materials. When the flame-retardant polyethylene plastic is prepared, the waste polyethylene is extruded and granulated to prepare the polyethylene master batch; carrying out catalytic pyrolysis on the polyethylene master batch, and then reacting with potassium permanganate to prepare a hydroxylated carbon nanotube; the preparation method comprises the following steps: reacting a hydroxylated carbon nanotube with 1-(chloro-methylphosphoryl) ethylene, and then reacting with (mercaptomethyl) triethoxysilane to prepare a modified carbon nanotube; the preparation method comprises the following steps: carrying out irradiation grafting on a polyethylene master batch, 2-hydroxy-4-propenyl benzophenone and N, N-diethyl allylamine, and then reacting with chloromethyl triethoxy silane to prepare modified polyethylene; and carrying out melt extrusion on the modified carbon nanotubes and the modified polyethylene, carrying out injection molding, and carrying out water treatment to obtain the flame-retardant polyethylene plastic. The flame-retardant polyethylene plastic prepared by the invention has good flame retardant property, antibacterial property, tensile strength and anti-aging property.

The invention relates to the technical field of transfer films, in particular to a graphene-containing far-infrared warm-keeping polyurethane transfer film and a preparation method thereof. The far-infrared warm-keeping polyurethane transfer film containing graphene comprises a three-layer structure including a supporting layer, a polyurethane transfer layer and a bonding layer, the polyurethane transfer layer is located on one side of the supporting layer, and the bonding layer is located on the other side of the polyurethane transfer layer; the polyurethane transfer layer is prepared from polyurethane resin, an organic solvent, an organic pigment and a composite modifier, the composite modifier is prepared from alkenyl modified graphene oxide, chloropropenyl modified hindered phenol and 4-allyloxy-2-hydroxybenzophenone, and the composite modifier is added, so that the polyurethane transfer layer is formed. The polyurethane transfer film has far infrared thermal insulation performance and good oxidation resistance and hydrolysis resistance.

The invention relates to the technical field of TPO waterproof coiled materials, and discloses modified titanium dioxide and a preparation method thereof, a composition for a thermoplastic polyolefin waterproof coiled material, the thermoplastic polyolefin waterproof coiled material and a preparation method of the thermoplastic polyolefin waterproof coiled material. The method for preparing the modified titanium dioxide comprises the following steps: in the presence of a solvent, carrying out first heating treatment on titanium dioxide and lignosulfonic acid to obtain an intermediate I; in the presence of an organic solvent, carrying out second heating treatment on the intermediate I and the component I to obtain modified titanium dioxide; the component I is selected from at least one of 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyl benzophenone and 2, 2-dihydroxy-4-methoxybenzophenone, and the component II is selected from at least one of 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyl benzophenone and 2, 2-dihydroxy-4-methoxybenzophenone. The modified titanium dioxide prepared by the method can be applied to the field of TPO waterproof coiled materials. The TPO waterproof coiled material prepared by adopting the composition for the TPO waterproof coiled material disclosed by the invention has excellent anti-aging performance.

The invention belongs to the technical field of anti-aging agents, and particularly relates to a bio-based anti-aging agent and a preparation method thereof. The bio-based anti-aging agent comprises modified lignin nanospheres, a natural anti-oxidation synergist, a nano inorganic filler, a surfactant and an anti-migration agent, the modified lignin nanospheres are obtained by carrying out demethoxylation activation on lignin and then carrying out grafting modification on the lignin and chlorobenzophenone. Compared with rubber prepared from aniline anti-aging agents, the prepared bio-based anti-aging agent is excellent in mechanical property, higher in ultraviolet aging resistance and high in elongation at break retention rate.

The invention provides a preparation method and application of a low-energy-consumption polyphenylene sulfide (PPS) melt-blown non-woven proton exchange membrane, and belongs to the technical field of preparation of fuel cells and proton exchange membranes. A solid solvent (benzophenone, benzoin, stearic acid, polyvinyl alcohol, beeswax and the like) is introduced into polyphenylene sulfide melt-blowing, so that the processing temperature of polyphenylene sulfide melt-blowing is effectively reduced, and the coefficient of variation of a polyphenylene sulfide melt-blown non-woven fabric material is remarkably reduced; high-uniformity polyphenylene sulfide melt-blown non-woven fabric is used as a substrate supporting layer, proton exchange groups are obtained through sulfonation hydrophilic modification, then a nanofiller capable of promoting and accelerating proton conduction is uniformly dispersed into a proper sulfonated polymer membrane casting solution, and the functionalized modified polyphenylene sulfide melt-blown non-woven fabric is subjected to casting coating, so that the sulfonated polymer membrane is obtained. And finally hot-pressing and strengthening to form the film. The fiber diameter, the capillary flow aperture, the variable coefficient and the mechanical property of the functional modified polyphenylene sulfide melt-blown non-woven fabric can be adjusted by optimizing the doping content of the solid solvent. In addition, the proton conductivity, methanol permeability and other properties of the proton exchange membrane can be improved by optimizing the variety and doping amount of the nanofiller. The polyphenylene sulfide melt-blown non-woven proton exchange membrane disclosed by the invention is low in raw material price, simple in process, green and environment-friendly, and easy for large-scale low-cost production.

The invention belongs to the technical field of building materials, and discloses a bio-based nylon thermal insulation material and a preparation method thereof, the bio-based nylon thermal insulation material comprises the following raw materials by weight: 75-85 parts of PA56, 25-35 parts of poly (p-phenylene terephthalamide), 20-30 parts of a modified filler, 1-2 parts of color masterbatch, 0.5-1.5 parts of a lubricant, 0.5-1.2 parts of an anti-aging agent, and 0.1-0.2 part of a cross-linking agent. According to the technical scheme, the modified filler containing the glass fibers, the hollow glass beads and the rich fluorine atoms has good compatibility with other raw materials, and has chemical action with the anti-aging agent containing a hindered phenol structure, a hindered amine structure and a benzophenone structure, so that the anti-aging performance of the modified filler is greatly improved, and the service life of the anti-aging agent is prolonged. The modified filler and the anti-aging agent can be highly dispersed and stably exist in the nylon heat-insulating material, play a role to the greatest extent, endow the nylon heat-insulating material with excellent and stable mechanical property, hydrophobic property, anti-aging property and the like, and greatly prolong the service life of the nylon heat-insulating material.

The invention relates to the technical field of high polymer materials, and discloses a low-VOC (volatile organic compound) polypropylene composite material and a preparation process thereof, the low-VOC polypropylene composite material comprises the following raw materials: polypropylene, maleic anhydride grafted polypropylene, fluorenyl silicone oil, benzophenone coated talcum powder, activated carbon, an antioxidant, a plasticizer and a lubricant; the interface bonding force between a siloxane long-chain flexible structure and a polypropylene matrix material is improved by preparing fluorenyl silicone oil, the thermal stability of the composite material is effectively improved by combining fluorene rings, thermal decomposition products are reduced, VOC components are physically adsorbed and captured through a multilevel porous structure of activated carbon, VOC volatilization can be effectively reduced, and the environmental protection capacity of the composite material can be enhanced. Meanwhile, benzophenone-coated talcum powder is added into the polypropylene composite material matrix, so that the wear resistance and ultraviolet resistance of the polypropylene composite material matrix are enhanced, and the service life of the polypropylene composite material is effectively prolonged.

The invention provides a flexible transparent polyimide film and a preparation method thereof, and relates to the technical field of high polymer materials. The polyimide film is prepared from diamine and dianhydride through a polymerization reaction. The diamine comprises a first diamine and a second diamine; the first diamine is aromatic diamine containing a rigid group; the second diamine is diamine containing imidazole; the dianhydride comprises first dianhydride and second dianhydride; the first dianhydride is selected from at least one of 3, 3, 4, 4-diphenyl sulfone tetracarboxylic dianhydride, 4, 4 '-biphenyl tetracarboxylic dianhydride and benzophenone tetracarboxylic dianhydride; and the second dianhydride is selected from 2, 2 '-(1, 4-piperazine diacyl)-succinic anhydride or 2R, 5R, 7S, 10S-naphthalene tetracarboxylic dianhydride. According to the polyimide film prepared by the method, the optical performance is remarkably improved, and meanwhile, better heat resistance and mechanical performance are obtained.

The invention discloses a high-performance PEEK composite material and application thereof in a robot skeleton, and belongs to the technical field of special engineering plastics, the PEEK composite material comprises the following components by weight: 50-80 parts of PEEK, 10-20 parts of an elastomer, 15-30 parts of carbon fiber, and 5-10 parts of a compatilizer, monomers 1-4 are copolymerized to obtain a hyperbranched polyaryletherketone copolymer, the hyperbranched polyaryletherketone copolymer is terminated by polysiloxane and modified by maleic anhydride, the monomer 1 is 4, 4 ', 4'-trihydroxy-3, 3 ', 3'-trimethoxytriphenylmethane, the monomer 2 is isopropyl hydroquinone, the monomer 3 is hydroquinone, and the monomer 4 is 4, 4 '-difluorobenzophenone. According to the high-performance PEEK composite material and the application of the high-performance PEEK composite material in the robot skeleton, the self-made compatilizer is added, so that the PEEK and carbon fiber composite material has the characteristics of high strength, good interfacial compatibility, good bending fatigue performance and the like.

A sunscreen composition includes a solvent and a sunscreen filter dissolved in the solvent. The solvent may include an ester. The ester may include an ester of salicylic acid, an ester of adipic acid, an ester of maleic acid, an ester of neopentanoic acid, an ester of C8-C18 fatty acids, or combinations thereof. The sunscreen filter may include a crystalline ultraviolet A (UVA) filter and / or a crystalline UVB filter. The sunscreen filter may include butyl methoxydibenzoylmethane, diethylhexyl butamido triazone, diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, or combinations thereof. The sunscreen composition may exclude ethylhexyl benzoate, phenethyl benzoate, C12-C15 alkyl benzoate, or combinations thereof. The sunscreen composition may exclude benzophenone-3, octyl methoxycinnamate, 2-ethylhexyl-2-cyano-3,3-diphenylacrylate, 3,3,5-trimethylcyclohexyl salicylate, 2-ethylhexyl salicylate, or combinations thereof.

The invention relates to the technical field of fiber membranes, and discloses an anti-ultraviolet aging polylactic acid composite fiber membrane, and compared with a pure-phase polylactic acid fiber membrane, a polylactic acid fiber membrane added with benzophenone-based polyethylene glycol grafted nano titanium dioxide has stronger mechanical properties and anti-ultraviolet aging capability, and the anti-ultraviolet aging polylactic acid composite fiber membrane has the advantages that the mechanical property is better; nanometer titanium dioxide is a broadband series semiconductor additive material, a network structure can be formed between the nanometer titanium dioxide and an organic matrix, the mechanical performance of the fiber membrane is improved, the ultraviolet absorption capacity of the polylactic acid fiber membrane is improved, and a benzophenone derivative can serve as an ultraviolet absorbent to be added into the polylactic acid fiber membrane, so that the ultraviolet absorption capacity of the polylactic acid fiber membrane is improved. The anti-ultraviolet aging effect of the polylactic acid fiber membrane is improved, the polyethylene glycol and the polylactic acid have good compatibility, and the anti-ultraviolet aging and mechanical properties of the nano titanium dioxide in the polylactic acid fiber membrane are improved.

A silicone hydrogel contact lens formulation comprising [a] at least 40 wt% of a polymerisable siloxane, [b] at least 30 wt% of hydrophilic N-vinyl amide monomer, such as vinyl-N-methyl acetamide (VMA), N-vinyl pyrrolidone (NVP), N-vinyl formamide, or N-vinyl acetamide; [c] triphenylphosphine (TPP) and [d] 1,4-bis[(2-methacryloxyethyl)amino]-9,10-anthraquinone (RB247). The contact lens formulation can further comprise an anthraquinone blue tinting agent, a benzophenone UV-absorbing agent and / or a benzotriazole HEVL absorber to stabilise the silicone hydrogel contact lens formulation.

The invention discloses modified silicon dioxide microspheres for high performance liquid chromatography and a preparation method of the modified silicon dioxide microspheres, and relates to the technical field of chromatographic packing. When the modified silicon dioxide microspheres for the high performance liquid chromatography are prepared, firstly, (perfluorohexyl) benzene reacts with isophthaloyl dichloride to prepare a perfluorohexyl benzophenone compound; the preparation method comprises the following steps: reacting a perfluorohexyl benzophenone compound with hydrazine hydrate to prepare a perfluorohexyl hydrazone compound; carrying out catalytic decomposition on the perfluorohexyl hydrazone compound to prepare a hydrophobic modified diazo compound; preparing monodispersed non-porous silicon dioxide microspheres by using a sol-gel method; modifying the non-porous silicon dioxide microspheres by an etching template method to prepare mesoporous core-shell silicon dioxide microspheres; and reacting the mesoporous core-shell silicon dioxide microspheres with a hydrophobic modified diazo compound to prepare the modified silicon dioxide microspheres for high performance liquid chromatography. The prepared modified silicon dioxide microspheres for high performance liquid chromatography have the advantages of monodisperse particle size, large specific surface area, small back pressure and high column efficiency.

The invention relates to the technical field of high-performance polymer synthesis, in particular to a preparation method of polyaryletherketone, which comprises the following steps: S1, under the condition of inert gas, adding dihalogenated benzophenone and bisphenol fluorene into a solvent, uniformly mixing, adding alkali carbonate, and reacting under the condition of heating to obtain an oligomer; s2, adding aromatic diphenol into the system in the step S1 in batches, and carrying out temperature programming reaction to obtain a block copolymer; and S3, adding an end-capping reagent into the system to carry out end-capping reaction, and after the reaction is finished, carrying out post-treatment to obtain the polyaryletherketone. According to the preparation method of the polyaryletherketone, a feeding mode of gradient segmented feeding is adopted, a polymerization process of low-temperature pre-polycondensation and high-temperature chain extension copolymerization is developed, the reaction rate is controllable, sequence distribution is uniform, and product performance is stable. In addition, the preparation method can effectively reduce energy consumption and is more beneficial to industrial production.

The invention belongs to the technical field of polymer chemical production, and discloses a method for continuously and efficiently preparing polyether-ether-ketone. The method comprises the following steps: dissolving 4, 4 '-difluorobenzophenone and diphenyl sulfone in a first dissolving tank to obtain a 4, 4'-difluorobenzophenone solution; hydroquinone, a catalyst and diphenyl sulfone are placed in a second dissolving tank to be dissolved, and a hydroquinone solution is obtained; the preparation method comprises the following steps: injecting a 4, 4 '-difluorobenzophenone solution and a hydroquinone solution into a reactor for polymerization reaction to obtain a mixed solution; injecting the mixed solution into a separator through a heat exchanger for separation to obtain polyether-ether-ketone and liquid; distilling the liquid to obtain diphenyl sulfone and sodium fluoride, and returning the obtained diphenyl sulfone to participate in dissolution; all the steps are carried out in a protective atmosphere. The preparation process provided by the invention is a brand new PEEK production process flow, and realizes continuous PEEK production and efficient energy recycling.

The invention discloses a preparation method of a beta-aryl beta-pyridyl alkyl ketone compound, which comprises the following steps: in the presence of a photocatalyst and under the condition of blue light irradiation, reacting a compound shown as a formula (1), a compound shown as a formula (2) and a compound shown as a formula (3) to generate the beta-aryl beta-pyridyl alkyl ketone compound shown as a formula (4), wherein Ar is selected from substituted or unsubstituted aryl, naphthyl and heteroaryl; the compound in the formula (2) is 4-cyanopyridine; the compound of formula (3) is aldehyde; and the photocatalyst is selected from tetrabutyl ammonium decatungstate (TBADT), 9-thioxanthone and a benzophenone type photocatalyst. The preparation method provided by the invention has the advantages of cheap and easily available reaction raw materials, simple reaction operation, wide application range of reaction substrates, easy amplification of reaction, mild reaction conditions and the like, and can realize industrial production and application. # imgabs0 #

The invention relates to the technical field of water treatment, in particular to a method for preparing a quaternized modified tannin-based organic flocculant through irradiation grafting, a product prepared through the method and application of the quaternized modified tannin-based organic flocculant. The method comprises the following steps: (1) under the irradiation of 30-60 mW / cm < 2 > of ultraviolet light, adding brominated vinyl triphenylphosphine into a mixture of tannic acid and a photoinitiator for reaction; (2) adjusting the ultraviolet intensity to 5-20 mW / cm < 2 > for reaction; (3) closing the ultraviolet reaction; and (4) precipitating the product with ethanol, filtering and washing to obtain the quaternary phosphonium modified tannin-based organic flocculant. Wherein the photoinitiator is selected from one of benzophenone and benzoin dimethyl ether. The quaternized modified tannin-based organic flocculant provided by the invention can efficiently remove algae in a water body in an environment-friendly manner, and avoids secondary pollution caused by algae cell rupture at the same time.

The invention relates to the technical field of composite materials, in particular to a polyaryletherketone-based shape memory composite material and a preparation method thereof. Comprising a terpolymer, shape memory polyurethane, a first heat-conducting filler and a second heat-conducting filler, 4, 4 '-difluorobenzophenone and hydroquinone are firstly pre-polymerized to obtain a PEEK prepolymer, the PEEK prepolymer is terminated by a hydroxyl olefine acid ester monomer to obtain a terminated copolymer, and then an acrylate monomer and the terminated copolymer are subjected to double-bond addition to obtain the terpolymer; the first heat-conducting filler is a one-dimensional nano heat-conducting filler; the second heat-conducting filler is a zero-dimensional and / or two-dimensional heat-conducting substance; the prepared composite material has the shape fixing rate of 85% or above and the shape recovery rate of 87% or above, the recovery time is shorter than 25 seconds, and the good shape memory performance is achieved.

The invention relates to polyether-ether-ketone resin with extremely narrow molecular weight distribution as well as a preparation method and application of the polyether-ether-ketone resin. The preparation method of the polyether-ether-ketone resin comprises the following steps: uniformly mixing 4, 4 '-difluorobenzophenone, a phenolic monomer, a salt-forming agent and a solvent in an inert atmosphere, carrying out gradient heating, and then carrying out end capping; the gradient heating comprises the following steps: in the initial stage, the heat preservation temperature is 140-210 DEG C, in the transition stage, the heat preservation temperature is 250-280 DEG C, and in the final stage, the heat preservation temperature is 300-320 DEG C. The prepared PEEK resin has very narrow molecular weight distribution, the chemical, heat-resistant stability, anti-fatigue performance and mechanical performance of the PEEK resin can be remarkably improved, and the high-performance and high-quality requirements of PEEK in the high-end manufacturing field such as aerospace, medical treatment, electronics and semiconductors are met.

The invention discloses an anti-aging and anti-yellowing foaming polyester material and a preparation method thereof, and relates to the technical field of polyester materials. The anti-aging and yellowing-resistant foamed polyester material is prepared from the following raw material components in parts by weight: 3 to 5 parts of anti-ultraviolet SEBS (Styrene-Ethylene-Butylene-Styrene), 3.6 to 7 parts of triethylamine, 4 to 6 parts of flame-retardant and wear-resistant filler, 100 parts of TPEE (Thermoplastic Polyether Ester Ether), 0.9 to 1.1 parts of polymer wax and 0.6 to 0.8 part of foaming agent, the anti-ultraviolet SEBS is obtained by copolymerizing and grafting an unsaturated benzophenone ultraviolet absorbent, SEBS and maleic anhydride; the flame-retardant and wear-resistant filler is obtained by mixing and reacting carboxylated nano silicon dioxide, pentaerythritol and phosphorus oxychloride; the polymer wax adopts EVA (Ethylene Vinyl Acetate) wax; azodicarbonamide is adopted as the foaming agent; the anti-aging and anti-yellowing foaming polyester material disclosed by the invention is relatively good in mechanical property, anti-aging property, flame retardant property and compression resistance.

The invention belongs to the technical field of preparation of composite membranes, and discloses a preparation method of a multipurpose nano-material composite membrane, which comprises the following steps: firstly, carrying out preliminary grafting modification on cellulose nanofibers by using a benzophenone derivative to improve the dispersity, and then introducing a preset functional group to carry out deep modification to obtain a modified cellulose nanofiber composite membrane; the mass ratio of the cellulose nanofiber to the benzophenone derivative is (1: 0.05)-(1: 0.2); according to the invention, the dispersity of the nano material and the grafting efficiency of the functional group are effectively improved by finely regulating and controlling the modification process of the nano material, so that the composite film further enhances the multiple functional characteristics of antibacterial property, antifouling property, ultraviolet shielding property and the like on the basis of keeping the original excellent properties; and meanwhile, the construction of the functional gradient ensures that the composite film can exert the optimal performance in different application scenes, interface defects are not easily generated among the functional layers, and the overall performance is not influenced.

The invention relates to the technical field of electronic equipment protection accessories, and discloses a wear-resistant flexible mobile phone shell and a preparation method thereof, and the wear-resistant flexible mobile phone shell comprises the following components by mass: 65-75 parts of thermoplastic polyurethane; 8 to 12 parts of graphene oxide; 10 to 15 parts of a dynamic cross-linking agent; 0.3 to 0.5 part of an antioxidant; 2-5 parts of anti-skid particles; the dynamic cross-linking agent is dithiobenzophenone, and forms a dynamic cross-linked network through fracture and recombination under a high-temperature condition; the sheet diameter of the graphene oxide is 0.5 to 5 [mu] m. The reversible dynamic cross-linking network is constructed by adopting the disulfide bond-based dynamic cross-linking agent, so that the flexibility and the self-repairing performance of the mobile phone shell are remarkably improved. Through dynamic recombination of a molecular level, the repair rate of scratches is successfully achieved by 90% or above, and the problems that an existing mobile phone shell is difficult to self-repair and the surface is prone to damage in the using process are effectively solved.