1568 results about "Tert butyl" patented technology

The invention provides a redox imidazole covalent organic framework material as well as a preparation method and application thereof, belongs to the technical field of material preparation and photocatalytic preparation of hydrogen peroxide, and aims to solve the technical problem of low activity of a current covalent organic framework in preparation of hydrogen peroxide. The preparation method of the imidazole-connected redox type imidazole covalent organic framework material comprises the following steps: respectively reacting a reactant 2, 7-di-tert-butylpyrene-4, 5, 9, 10-tetraketone monomer with 4, 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ' The preparation method comprises the following steps: mixing 4, 4 '-(pyridine-2, 4, 6-triyl) tribenzaldehyde and a tri (4-formylphenyl) amine monomer, adding a solvent and a catalyst, uniformly stirring, and reacting to obtain the redox type imidazole covalent organic framework material after the reaction is finished. The application comprises the following steps: adding the covalent organic framework, oxygen and the sacrificial agent into water, and reacting under the irradiation of visible light. The preparation method is green, environment-friendly, simple and easy to implement, the prepared material has good thermal stability, and efficient visible light photocatalysis preparation of hydrogen peroxide can be achieved; meanwhile, the catalyst can be recycled and has good photocatalytic stability.

The invention relates to the technical field of composite film preparation, in particular to a multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film and a preparation method thereof.The multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film comprises a base material layer, a gas barrier layer, a bonding transition layer and a nano ceramic functional coating; the base material layer comprises the following components in parts by mass: 80-100 parts of biaxially oriented polypropylene; 20 to 30 parts of metallocene linear low density polyethylene; 5 to 8 parts of nano titanium dioxide; 0.5 to 1 part of beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid; and 0.3 to 0.6 part of calcium stearate. Through the multi-layer co-extrusion and gradient curing technology and the five-layer co-extrusion technology, it is ensured that the thickness of a base film is uniform and interlayer bonding is firm, the adhesive force of the coating is enhanced through plasma surface treatment, and activity retention and uniform distribution of functional components are guaranteed through the segmented curing strategy of the nano ceramic coating; compared with a traditional hot-pressing compounding or solvent coating process of the composite film, the energy consumption and the solvent residue risk are greatly reduced, meanwhile, the production efficiency and the product consistency are improved, and large-scale application is provided for medicine packaging.

The invention discloses an antistatic polyisoprene rubber anesthesia air storage bag, and relates to the technical field of anesthesia air storage bags. The antistatic polyisoprene rubber anesthesia air storage bag is prepared from the following raw materials in parts by weight: 100 parts of polyisoprene latex, 0.5 to 2 parts of a stabilizer, 1 to 2 parts of a sodium p-styrenesulfonate aqueous solution, 3 to 6 parts of nano silicon dioxide suspension dispersion liquid, 1 to 2 parts of an anti-aging agent, 0.8 to 2 parts of conductive graphite and 3 to 6 parts of a vulcanization bag, the anti-aging agent is prepared by the following steps: reacting 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid with glycerol 1-oleyl ether-d5 to generate an esterification product, epoxidizing the esterification product with hydrogen peroxide and formic acid, and reacting the epoxidized product with N-phenyl-1, 3-phenylenediamine, and has excellent migration resistance. By adding the anti-aging agent into the polyisoprene rubber, the anti-aging capability of the anesthesia air storage bag is improved.

The invention relates to the technical field of chemical synthesis, and particularly provides a preparation method of a semaglutide side chain, which comprises the following steps: step S1, carrying out reaction on octadecanedioic acid mono-tert-butyl ester and trifluoroacetic acid pentafluorophenyl ester to generate a first intermediate; s2, enabling the first intermediate to react with 1-tert-butyl L-glutamic acid to generate a second intermediate; s3, enabling the second intermediate to react with pentafluorophenyl trifluoroacetate to generate a third intermediate; and S4, carrying out an amidation reaction on the third intermediate and 17-amino-10-oxo-3, 6, 12, 15-tetraoxa-9-aza-heptadecanoic acid, so as to generate a semaglutide side chain, and carrying out an amidation reaction on the third intermediate and 17-amino-10-oxo-3, 6, 12, 15-tetraoxa-9-aza-heptadecanoic acid. According to the preparation method disclosed by the embodiment of the invention, the pentafluorophenyl trifluoroacetate is used as the condensation reagent for two times to activate the carboxylic acid, and the amidation reaction is carried out for two times to construct the amido bond after each activation, so that compared with the traditional carbodiimide and urea positive ion type condensation reagent, the chiral racemization in the condensation process can be effectively avoided, and the yield of the product is improved. The condensation chiral racemization impurity can be lower than 0.3%.

The invention relates to the technical field of cables, in particular to a high-toughness halogen-free flame-retardant crosslinked cable and a preparation method thereof.High-density polyethylene, ethylene-vinyl acetate copolymer, modified MXene and auxiliaries are mixed and co-extruded, and ultraviolet radiation crosslinking is adopted to prepare a reinforcing layer of the cable; the preparation method comprises the following steps: firstly, coating MXene with dopamine, treating with tert-butyldimethylsilyl chloride, then grafting DOPO (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide), and then introducing double bonds on the composite MXene; a self-repairing polyurethane emulsion, modified MXene and a photoinitiator are blended to prepare a protective coating, the surface of the reinforcing layer is coated with the protective coating, light curing treatment is carried out, and the water-resistant and corrosion-resistant protective layer sleeve with the self-repairing surface is prepared; a chain extender containing boric acid ester bonds and disulfide bonds is added in the preparation of the self-repairing polyurethane emulsion, and pentaerythritol triacrylate is used as a photosensitizer.

The invention relates to the field of cables, and discloses a modified polyvinyl chloride composite material for cables and a preparation method thereof.The composite material comprises low-density polyethylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, nitrile rubber, modified graphene oxide, modified nano calcium carbonate and auxiliaries; the modified graphene oxide is prepared by reacting acylating chlorination of graphene oxide with an anti-aging derivative, the anti-aging derivative is prepared by reducing a benzoxazole-containing intermediate generated by a reaction of 2-amino-4-bromophenol and 4-cyanobenzaldehyde to obtain an aminated benzoxazole-containing intermediate, then the aminated benzoxazole-containing intermediate reacts with p-phenylenediamine, and then the product reacts with 3-(3, 4-dichlorophenyl)-1, 2, 3-triazole-3-one to obtain the anti-aging graphene oxide. 2, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride is subjected to a reaction to prepare the product. And the modified nano calcium carbonate is prepared by reacting phosphonitrilic chloride trimer with an amino silane coupling agent and 2-amino benzoxazole-5-borate and then grafting on the surface of the nano calcium carbonate. The composite material prepared by the invention has excellent flame retardance, heat resistance and long-acting oxidation resistance.

The invention discloses a method for detecting antioxidants and polyphenols in food by constructing a colorimetric sensing array based on monatomic iron nano-enzyme, and belongs to the field of nanotechnology and colorimetric sensing. The traditional monatomic nano enzyme shows limited enzyme-like activity and substrate specificity, and is difficult to meet the comprehensive requirements of detecting various antioxidants and polyphenols in food. In the research, a novel nano-enzyme system (sdsFeN (at) G) of monatomic iron nano-enzyme is developed. The SdsFeN (at) G shows excellent enzymatic activity, and a three-channel colorimetric sensing array is constructed by utilizing inhibition of different antioxidants and polyphenols on oxidation of three chromogenic substrates, so that simple, convenient and reliable identification and detection of five substances (tert-butylhydroquinone, butylated hydroxyanisole, propyl gallate, catechol and hydroquinone) in food are realized.

The invention discloses a method for preparing tert-butyl ethylbenzene through alkylation of ethylbenzene and isobutene. In a reactor, a raw material containing ethylbenzene and isobutene is in contact with a catalyst for an alkylation reaction to obtain a product containing tert-butyl ethylbenzene, by changing the proportion of the shell ZSM-12 molecular sieve in the hydrogen-type Beta-coated ZSM-12 core-shell molecular sieve and combining high-temperature water vapor treatment, the obtained catalyst shows excellent catalytic performance in liquid-phase alkylation reaction of ethylbenzene and isobutene. The catalyst preparation process is simple to operate and easy for industrial production. The development of a p-tert-butyl ethylbenzene production technology is favorably promoted.

The invention belongs to the technical field of insulator materials, and particularly relates to an insulating busbar and a preparation method thereof. The preparation method of the insulating busbar comprises the following steps: coating glue on the surface of a busbar base material, and drying to obtain a busbar with a bonding layer; the preparation method comprises the following steps: mixing 40 to 60 parts of silicon resin, 20 to 40 parts of grafted silicon dioxide, 10 to 20 parts of aluminum oxide and 2 to 4 parts of 2, 5-dimethyl-2, 5-bis-(tert-butylperoxy) hexane, so as to obtain a sizing material; placing the busbar with the bonding layer in a mold, then adding a sizing material, and pressing to obtain an insulating busbar; the preparation method of the grafted silicon dioxide comprises the following steps: stirring m-aminobenzoic acid and 3-aminopropyltriethoxysilane for reaction to obtain a grafting solution, and adding silicon dioxide into the grafting solution for grafting reaction to obtain the grafted silicon dioxide.

The invention relates to a glass fiber reinforced PET composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material is prepared from the following raw materials in parts by weight: 100 parts of PET (Polyethylene Terephthalate) master batch, 32 to 45 parts of modified glass fiber, 0.19 to 0.24 part of nucleating agent, 1.6 to 2 parts of lubricating agent and 0.12 to 0.15 part of antioxidant, the modified glass fiber is prepared by grafting sulfydryl on the surface of glass fiber by KH-580 to prepare sulfhydrylated glass fiber, reacting tert-butyldimethylamine with 2-bromoethanol to form hydroxyl-terminated quaternary ammonium salt, substituting with octylene trichlorosilane to form a modifier, and adding alkenyl containing alkyl long chains introduced into the modifier molecule with the sulfydryl grafted on the surface to prepare the modified glass fiber. Introducing modifier molecules to the surfaces of the glass fibers; and the modified glass fiber improves the strength of the composite material and keeps high impact resistance.

The invention discloses high-performance anti-wear engine lubricating oil as well as a preparation method and application thereof. The high-performance anti-wear engine lubricating oil is prepared from the following raw materials: self-developed lubricating oil base oil, poly-alpha-olefin, zinc dialkyl dithiophosphate, calcium sulfonate, polyisobutylene succinimide, an antioxidant, polymethacrylate, an organic molybdenum complex, a de-foaming agent and a pour point depressant. The preparation method comprises the following steps: 1) synthesizing 9, 10-bis (2-tert-butyl-4-methylphenoxy) trimethylolethane stearate as base oil of the lubricating oil; and 2) mixing the base oil with other assistants to obtain the high-performance anti-wear engine lubricating oil. According to the preparation method, novel-like synthetic ester oil is firstly prepared, a phenol group and a large steric hindrance substituent group are introduced into a polymer, the anti-oxidation function is directly built in base oil molecules, meanwhile, super-strong heat resistance is achieved, and finally the high-performance anti-wear engine lubricating oil is obtained and can be applied to high-end application scenes such as aero-engines or gas turbines.

The invention belongs to the technical field of insulating oil, and provides a slow-release antioxidant as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing octadecyl trimethyl ammonium bromide, 2, 6-butylated hydroxytoluene, tetraethoxysilane, water and ammonia water, and reacting to obtain the antioxidant; and (2) in a protective atmosphere, mixing the antioxidant, ethanol, water and gamma-mercaptopropyltriethoxysilane, and carrying out a reaction so as to obtain the slow-release antioxidant. The slow-release antioxidant suitable for the synthetic ester insulating oil is prepared through a physical coating means and oleophylic modification, has excellent solubility, can effectively inhibit the increase of the acid value of the synthetic ester insulating oil, delays the oxidation process of the synthetic ester insulating oil, and remarkably prolongs the service life of the insulating oil. Meanwhile, through a slow release mechanism, the antioxidant can prolong the antioxidant effect of the antioxidant, improve the antioxidant stability in long-time operation and meet the higher antioxidant requirement of high-performance equipment such as a transformer for the insulating oil.

The invention discloses a preparation method and application of a photo-thermal dual-response membrane material, and relates to the field of membrane materials. When the photo-thermal double-response membrane material is prepared, a photo-thermal material firstly reacts with 4-(triethoxysilyl) aniline and then reacts with 2, 4, 6-trihydroxy-1, 3, 5-benzenetricarboxaldehyde and p-phenylenediamine, and a modified photo-thermal material is prepared; the preparation method comprises the following steps: sequentially reacting benzaldehyde with 2-hydroxyacetophenone and 3-N, N-dimethylamino methacryloyl chloride to prepare a photo-initiation monomer; the preparation method comprises the following steps: mixing N-isopropylacrylamide, a photo-initiation monomer, N, N '-methylene bisacrylamide and a modified photo-thermal material, combining with a hydrophobic substrate membrane, preparing a membrane, and finishing the surface by using 2-bromo-1-[3, 5-di (tert-butyl)-4-hydroxyphenyl] ethanone, thereby obtaining the photo-thermal dual-response membrane material. The photo-thermal dual-response membrane material prepared by the invention has the characteristics of pollution resistance, easiness in cleaning, durability, antibacterial property, metal ion recovery and low energy consumption.

The present invention discloses a fluorosilicone rubber, a fluorosilicone rubber hose and a preparation method and application thereof. The fluorosilicone rubber is prepared from the following components calculated by weight: 50 to 70 parts of fluorosilicone raw rubber; 20 to 45 parts of high temperature flame retardant silicone rubber; 30 to 40 parts of fumed silica; 0.5 to 2 parts of diisopropylbenzene peroxide; 5 to 10 parts of hydroxy silicone oil; 1 to 3 parts of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane. The fluorosilicone rubber hose of the present invention has good elasticity and flexibility, convenient installation and layout, convenient maintenance, good vibration-proof effect and high reliability. The bonding strength between the hose and the silicone is good, the fatigue resistance of the hose is excellent, the raw materials of the product are easy to obtain, the cost is low, and it is conducive to large-scale production and improving market competitiveness. The combination of fluorosilicone rubber and high temperature resistant silicone saves the cost of raw materials, and can also achieve the characteristics of high temperature resistance, weather resistance, aging resistance and flame retardancy, and at the same time has a breakthrough development in technology.

The invention relates to an insulating material, in particular to a voltage-breakdown-resistant high-insulation EPDM material and application thereof, and the voltage-breakdown-resistant high-insulation EPDM material comprises the following components: modified silicone rubber, 4, 4 '-thiobis (6-tert-butyl o-cresol), a composite filler, a cross-linking agent, 4-isopropoxybenzoic acid and an EPDM matrix; according to the voltage-breakdown-resistant high-insulation EPDM material disclosed by the invention, the comprehensive performance of the material is greatly improved and the application field of the EPDM material is widened through the matching of all the components and the specific dosage ratio of the components. The modified silicone rubber is introduced, the modified silicone rubber is obtained by modifying vinyl-containing perfluoropolyether-b-polysiloxane, in the vinyl-containing perfluoropolyether-b-polysiloxane, a perfluoropolyether chain segment has extremely low surface energy and good chemical stability, and a polysiloxane chain segment endows the vinyl-containing perfluoropolyether-b-polysiloxane with excellent flexibility and electrical insulating property.

The invention relates to the field of polyester fibers, and discloses a composite enhanced polyester fiber for bags and suitcases and a preparation method thereof.The composite enhanced polyester fiber is prepared from polyethylene glycol terephthalate slices, polyethylene glycol, tris (2, 4-di-tert-butylbenzene) phosphite, tetra [beta-(3, 4-ditert-butylbenzene)] tetrakis [beta]-(2, 4-ditert-butylbenzene)] tetrakis [beta-(3, 4-ditert The composite material is prepared from 1, 3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, modified nano-zinc oxide, tetrabutyl titanate, a chitosan aqueous solution and acetic acid. The modified nano zinc oxide is prepared from gamma-aminopropyltriethoxysilane, an ethanol water solution, acetic acid and nano zinc oxide. The composite enhanced polyester fiber disclosed by the invention has relatively good antibacterial property, hygroscopicity and mechanical property.

The invention relates to the field of cables, and discloses a fire-resistant light cable for a safety harbor-returning system for a ship and a processing method thereof.The cable comprises a guide core, a fire-resistant layer, an insulating layer, a cabling layer, an inner sheath layer, an armor layer and an outer sheath layer which are sequentially arranged from inside to outside, and the inner sheath layer and the outer sheath layer are prepared by extruding sheath layer materials; the sheath layer is made of low-density polyethylene, nitrile rubber, ethylene-tetrafluoroethylene copolymer, functional additives, composite filler and auxiliaries; the functional additive is prepared by the following steps: reacting 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride with 2-chloro-4, 6-diamino-1, 3, 5-triazine to obtain a modified hindered phenol component, and then reacting 1, 4-p-xylylene dichloride with 10-(2, 5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide to obtain a product, and continuously reacting the product with the modified hindered phenol component; the composite filler is prepared by modifying vermiculite with titanium dioxide and zinc oxide pillared. The cable prepared by the invention has excellent mechanical properties, flame retardance and aging resistance.

The invention discloses a manufacturing method of a new energy power battery cooling liquid capable of improving storage stability, and belongs to the technical field of battery anti-freezing solutions, and the new energy power battery cooling liquid comprises the following auxiliary agent components and components: a) ethylene glycol which is used as a basic solvent and accounts for 40-50% of the total mass; b) deionized water accounting for 50%-60% of the total mass; c) an organic corrosion inhibitor which is selected from benzotriazole, mercaptobenzothiazole or a mixture of benzotriazole and mercaptobenzothiazole and accounts for 0.3-0.5% of the total mass; d) an antioxidant which is selected from di-tert-butyl-p-cresol, triphenyl phosphite or a mixture thereof and accounts for 0.1-0.2% of the total mass; the anti-foaming agent is selected from polydimethylsiloxane, silicone oil or a mixture of the polydimethylsiloxane and the silicone oil and accounts for 0.01%-0.05% of the total mass; and f) a pH regulator which is selected from sodium hydroxide, potassium hydroxide or a mixture thereof, is used for regulating the pH value of the cooling liquid to a suitable range of 7-9, and accounts for 0.05-0.15% of the total mass. The cooling liquid disclosed by the invention can keep the stability of key indexes such as conductivity, pH value, corrosion inhibition performance and oxidation resistance in a long-term storage process, so that the storage stability of the cooling liquid is remarkably improved.

The invention belongs to the technical field of crosslinked polyethylene, and particularly relates to crosslinked polyethylene for a high-voltage cable and a preparation method of the crosslinked polyethylene. The cross-linked polyethylene for the high-voltage cable is prepared from the following raw materials in parts by weight: 100 parts of low-density polyethylene, 3.5 to 4.5 parts of nano filler master batch, 0.30 to 0.35 part of tetra [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, 0.7 to 0.8 part of 2, 2, 6, 6-tetramethylpiperidine oxide, 0.7 to 0.8 part of 4-allyloxy-2-hydroxybenzophenone, 0.7 to 0.8 part of 2, 5-dimethyl-2, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 1.0 to 1.2 parts of 2, 5-di-tert-butylperoxy-3-hexyne; and 0.8 to 1.0 part of tert-butyl peroxyisononanoate. The crosslinked polyethylene for the high-voltage cable has excellent tensile strength and breakdown strength.

A skin care active substance and a skin care product. The skin care active substance comprises, in parts by weight, 0.1-15 parts of a moisturizing agent and 0.1-12 parts of a soothing agent, wherein the moisturizing agent comprises at least one of four-molecular-weight hyaluronic acid and D-panthenol, and the soothing agent comprises at least one of a Portulaca oleracea extract, dipotassium glycyrrhizinate, a Piper methysticum extract, and trans-4-tert-butylcyclohexanol. By designing the components and the ratio thereof, the synergistically formed active substance can mildly and effectively provide moisturizing, soothing, and repairing effects, thereby effectively protecting the skin barrier, maintaining skin health, and demonstrating high safety.

The present invention therefore relates to aqueous polymer latices of copolymers obtainable by aqueous emulsion polymerisation of ethylenically unsaturated monomers M, which comprise i. 5 to 90% by weight, in particular 10 to 70% by weight, especially 10 to 50% by weight, based on the total amount of monomers M, of a monomer M1, which is 1-hexyl acrylate; ii. 0 to 70% by weight, based on the total amount of monomers M, of at least one monomer M2, which is selected from C2-C5-alkyl esters of acrylic acid, except for tert-butyl acrylate, C7-C20-alkyl esters of acrylic acid and C5-C20-alkyl esters of methacrylic acid and mixtures thereof; iii. 5 to 70% by weight, based on the total amount of monomers M, of at least one monomer M3, which is selected from tert-butyl acrylate, C1-C4-alkyl esters of methacrylic acid, C5-C20-cycloalkyl esters of acrylic acid, C5-C20-cycloalkyl esters of methacrylic acid, C5-C20-cycloalkylmethyl esters of acrylic acid, C5-C20-cycloalkylmethyl esters of methacrylic acid, where cycloalkyl in the aforementioned monomers is mono-, bi- or tricyclic and where 1 or 2 nonadjacent CH2 moieties of cycloalkyl may be replaced by oxygen atoms and where cycloalkyl may be unsubstituted or carry 1, 2, 3 or 4 methyl groups, and monovinyl aromatic monomers, methylene-gamma-butyrolactone and mixtures thereof; where the total amount of monomers M1 and M2 is in the range from 10 to 90% by weight, based on the total amount of ethylenically unsaturated monomers M, and where the total amount of monomers M1, M2 and M3 is at least 90% by weight, based on the total amount of ethylenically unsaturated monomers M. The present invention also relates to a process for producing the aqueous polymer latices of the present invention. The present invention also relates to the use of these polymer latices as binders in waterborne coating compositions and waterborne adhesive compositions, in particular as binders in waterborne coating compositions.

The invention discloses 1, 2-dibromo-6-tert-butyl-9-(4-tert-butylphenyl)-9H-carbazole and a synthesis method of the 1, 2-dibromo-6-tert-butyl-9-(4-tert-butylphenyl) The method comprises the following steps: taking 3-nitrophthalic acid as an initial raw material, reacting trichloroisocyanuric acid with liquid bromine to obtain 1, 2-dibromo-3-nitrobenzene, reducing by stannous chloride to obtain 2, 3-dibromoaniline, carrying out diazotization reaction to obtain 2, 3-dibromophenylhydrazine, reacting with p-tert-butyl cyclohexanone, and reacting by using 2, 3-dichloro-5, 6-dibromophenylhydrazine to obtain 2, 3-dibromophenylhydrazine. The preparation method comprises the following steps: carrying out dehydrogenation on 2, 6-dicyanobenzoquinone to obtain 1, 2-dibromo-6-tert-butyl-9H-carbazole, and finally reacting the 1, 2-dibromo-6-tert-butyl-9H-carbazole with 4-tert-butyl iodobenzene to obtain the 1, 2-dibromo-6-tert-butyl-9-(4-tert-butylphenyl)-9H-carbazole. Due to the existence of a bromine atom functional group on the 1, 2-dibromo-6-tert-butyl-9-(4-tert-butylphenyl)-9H-carbazole, the further conversion of the compound has expandability, and the compound can be used as a material / drug molecule precursor in the fields of organic light-emitting semiconductors, pharmaceutical chemistry and the like.

The invention relates to the technical field of building materials, in particular to a high-elasticity polyurethane-asphalt composite road crack repair material and a preparation method thereof, and the high-elasticity polyurethane-asphalt composite road crack repair material comprises the following raw materials: an asphalt-based material, functional modified polyurethane, a polyether-polyolefin block copolymer, functional rubber, 2, 6-di-tert-butyl-4-methylphenol and sodium polyacrylate. According to the invention, a lipophilic functional group is introduced into a molecular chain of the functionalized modified polyurethane, so that the functionalized modified polyurethane can interact with alkyl in asphalt to form a more stable synergistic network structure, and the phase separation phenomenon of the polyurethane and the asphalt is effectively reduced; the modified polyurethane not only improves the elasticity, flexibility, temperature resistance and crack resistance of the composite material, but also optimizes the processability of the material, enhances the interface bonding force, and further improves the repair effect and the road durability.

The invention discloses a high-strength tungsten-boron silicone rubber radiation shielding material, which is prepared from the following ingredients in parts by weight: 100 parts of methyl vinyl silicone rubber raw rubber, 30 to 50 parts of white carbon black, 90 to 240 parts of tungsten oxide coated boron carbide heterostructure particles, 4 to 10 parts of hydroxyl silicone oil and 1 to 2.5 parts of 2, 5-dimethyl-2, 5-bis-(tert-butylperoxy) hexane. The preparation method comprises the following steps: 1, surface modification of tungsten oxide particles; 2, boron carbide surface modification; 3, grafting the surfaces of the two; and 4, mixing and vulcanizing the raw materials. White carbon black and tungsten oxide coated boron carbide heterostructure particles are introduced into the material, so that the dispersity of tungsten oxide particles in a silicon rubber matrix is improved, the interface interaction between boron carbide and the silicon rubber matrix is enhanced, the high strength of the material is ensured, and the material has excellent mechanical strength and neutron / gamma ray comprehensive shielding performance; the method is easy for mass production and can be used in the field of radiation protection.

The invention provides a flexible switching production method and equipment for low cis-polybutadiene rubber (LCBR), solution polymerized styrene-butadiene rubber (SSBR) and hydroxyl-terminated liquid polybutadiene rubber (HTPB), the flexible switching production equipment comprises an initiator production device and a polymerization unit, and the flexible switching production method comprises the following steps: mixing cyclohexane and n-hexane according to a volume ratio of 6.5: 3.5-7: 3, adding an initiator, and stirring to obtain a mixture; forming a mixed solvent; the method comprises the following steps: adding a monomer, an active agent, an initiator and a mixed solvent into a polymerization kettle 31 of a polymerization unit, and carrying out polymerization reaction to obtain a low-cis-polybutadiene, solution polymerized styrene-butadiene or hydroxyl-terminated liquid polybutadiene rubber solution; a novel protection initiator tert-butyl dimethyl siloxy propyl sodium is designed, and hydroxyl-terminated liquid polybutadiene rubber with a controllable structure is prepared through anionic living polymerization. According to the process, shutdown for kettle cleaning is not needed, the low cis-polybutadiene, the solution polymerized styrene-butadiene and the hydroxyl-terminated liquid polybutadiene rubber can be produced on the same polymerization device in a flexible switching manner, and the overall production efficiency is improved.

The invention relates to the technical field of high polymer materials, in particular to an EVA / nano-zinc oxide anti-ultraviolet car cover and a preparation method thereof. The invention aims to solve the problem that the mechanical strength and the ultraviolet resistance of the existing car cover are difficult to consider at the same time. Ethylene-vinyl acetate resin is used as a matrix, a silane coupling agent and hydroxyethyl methylacrylate surface modified and grafted composite nano-zinc oxide, maleic anhydride grafted EVA and a polyurethane modifier are subjected to melt blending, a TMPTA cross-linking agent is added, and the vehicle cover film is prepared through extrusion casting and ultraviolet curing. Wherein the polyurethane modifier is obtained by reacting polycaprolactone polyol with isophorone diisocyanate and adopting hydroxyethyl methylacrylate and 2, 2 '-methylenebis (6-tert-butyl-4-methylphenol) for end capping. The uvioresistant car cover prepared by the invention has excellent tensile strength, elongation at break, uvioresistant performance and adhesive force at the same time.

The invention relates to the field of cables, and discloses a flame-retardant impact-resistant cable and a preparation process thereof.The cable sheath layer is prepared from low-density polyethylene, nitrile rubber, ethylene-vinyl acetate copolymer, modified halloysite nanotubes and a flame-retardant additive, the preparation method comprises the following steps: carrying out acylating chlorination on 2, 4-dihydroxyphenyl)-2H-benzotriazole, reacting with 3, 5-di-tert-butyl-4-hydroxybenzylamine to prepare a modified acylating chlorination ultraviolet absorbent, and grafting the modified acylating chlorination ultraviolet absorbent with aminated halloysite nanotubes to prepare the ultraviolet absorbent. The aminated halloysite nanotube is prepared by using gamma-aminopropyl triethoxy silane to modify the aminated halloysite nanotube; the flame-retardant additive is prepared from a flame-retardant intermediate obtained by reaction of diphenyl silanediol and phosphorus oxychloride and phosphonitrilic chloride trimer through a precipitation polymerization method. The added modified halloysite nanotube and flame-retardant additive can endow the cable with excellent mechanical properties, aging resistance, flame retardance and heat resistance.

The invention relates to the field of electric wires and cables, and discloses a high-temperature-oxidation-resistant flame-retardant electric wire and cable and a preparation method thereof.The sheath layer of the electric wire and cable comprises low-density polyethylene, nitrile rubber, natural rubber, ethylene-tetrafluoroethylene copolymer, modified multi-walled carbon nanotubes, modified nano titanium dioxide and auxiliaries; the modified multi-walled carbon nanotube is prepared by reacting an acylating chlorination multi-walled carbon nanotube with a polycyclotriphosphazene derivative; the polycyclotriphosphazene derivative is prepared by reacting hexachlorocyclotriphosphazene with p-aminodiphenylamine and then taking diphenyl dihydroxysilane as a linker; the modified nano titanium dioxide is prepared by the following steps: substituting phenylphosphoryl dichloride with phloroglucinol, then sequentially substituting with 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride and 3-aminopropyltriethoxysilane, and grafting an obtained antioxidant phosphorus-containing coupling agent with nano titanium dioxide. The sheath layer material prepared by the invention has excellent high-temperature oxidation resistance, flame retardance, wear resistance and heat resistance.

The invention belongs to the technical field of rubber sealing rings, and particularly discloses a wading rubber sealing ring and a preparation method thereof, the wading rubber sealing ring comprises the following components by weight: 60-70 parts of modified ethylene propylene diene monomer, 35-50 parts of modified white carbon black, 20-30 parts of hydrogenated nitrile rubber, 0-10 parts of fluororubber, 2-5 parts of polyester fiber, 0.5-3 parts of an anti-hydrolysis agent, and 1-3 parts of a hydrophobic agent. 2-4 parts of an antimicrobial agent, 3-5 parts of an anti-aging agent and 1-7 parts of sulfur; the anti-hydrolysis agent is a mixture of tetrakis [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester and a carbodiimide anti-hydrolysis agent; the hydrophobic agent is a mixture of polydimethylsiloxane and perfluorooctyltriethoxysilane, and the hydrophobic agent is a mixture of polydimethylsiloxane and perfluorooctyltriethoxysilane. The wading rubber sealing rubber ring and the preparation method thereof are suitable for fresh water and warm water scenes, and have wide application prospects in ship sealing and sewage treatment equipment in seawater and industrial wastewater scenes.

The invention discloses self-repairing waterborne polyurethane based on double dynamic bond synergy and a preparation method thereof.The method comprises the following steps that 1, in the nitrogen atmosphere, after isophorone diisocyanate, polytetrahydrofuran diol and dimethylolpropionic acid react for a period of time, a catalyst is added for continuous reaction, and a prepolymer is synthesized; (2) adding N, N-di-tert-butyl ethylenediamine into the prepolymer, and carrying out chain extension reaction; (3) adding dithiothreitol into the solution after the reaction in the step (2) to carry out cross-linking reaction; and (4) adding triethylamine into the solution obtained after the reaction in the step (3), and carrying out a salt forming reaction to obtain the self-repairing waterborne polyurethane emulsion based on double dynamic bond synergy. High self-healing efficiency and mechanical performance are achieved by introducing dynamic covalent bonds with double thermal responses, and reprocessing and recycling are achieved at the same time.