263 results about "Disulfide compound" patented technology

The present invention relates to a preparation method of an intelligent self-repairing, flame-retardant and light-resistant water-based polyurethane coating. The method comprises the following steps: preparing a self-made hyperbranched flame retardant and using it in the synthesis of a polyurethane prepolymer; cooling the mixture to 58° C., adding 2,2-dimethylolpropionic acid, reacting the mixture for 1 to 2 hours, adding 1 to 2 parts of a disulfide compound, reacting the mixture for 1 to 2 hours at 60 to 80° C., adding 1 to 2 parts of a hydrogen bonding agent, reacting the mixture for 1 hour at 60 to 80° C., adding 0.5 to 1.5 parts of a coumarin derivative, and reacting the mixture for 60 to 90° C. The mixture was stirred for 1-2 hours, and then spiropyran, diethanol monoisopropanolamine, and 0.01 parts of p-toluenesulfonamide were added, and the mixture was reacted at 50°C for 30 minutes. The temperature was lowered to 40-45°C, and 1-2 parts of triethylamine were added, and the mixture was reacted for 1-2 hours. The mixture was cooled to room temperature, and 60-65 parts of water were added. The mixture was stirred at a speed of 1800-2000 r / min for 0.5-1 hour to obtain an intelligent self-healing, flame-retardant, and light-resistant water-based polyurethane coating. The flame retardancy and self-healing properties of the obtained water-based polyurethane were significantly improved.

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

The invention relates to a preparation method of an ultra-thin copper foil with metal-organic disulfide as a composite stripping layer, and belongs to the technical field of manufacturing of thin copper foils. The metal stripping layer is prepared through direct-current electrodeposition, and the interface of a carrier copper foil and the metal stripping layer is strongly combined; organic disulphide or organic disulphide salt is adsorbed between the metal stripping layer and the ultra-thin copper foil to form an organic stripping layer, so that a composite stripping layer with a uniform surface and stable performance is obtained, the stripping strength of the carrier copper foil is effectively reduced, and the ultra-thin copper foil is ultra-thin and uniform; and the binding force between the composite stripping layer and the carrier foil and the binding force between the composite stripping layer and the ultra-thin copper foil are different, so that the ultra-thin copper foil before and after pressing can be easily, completely and stably stripped from the carrier foil.

An industrial gas purification catalyst, and a preparation and a use thereof. The catalyst comprises a type A molecular sieve, and MoO3 / WO3 and NiO / CoO loaded on the type A molecular sieve, the content of molybdenum or tungsten being 3-12 wt% in terms of MoO3 or WO3, and the content of nickel or cobalt being 3-7 wt% in terms of NiO or CoO; by molar ratio, the molecular sieve also contains 55%-75% alkali metal or alkaline earth metal that has not undergone ion exchange, the alkali metal or alkaline earth metal being sodium, potassium, or calcium. The catalyst can be used to purify oxygen, olefins, HCN, thiophene, disulfide, mercaptan, sulfide, CS2 and other complex sulfides and / or COS in ammonia-containing and high-CO+CO2 gas sources, to achieve a target purification effect.

The invention discloses a method for determining the content of bis (2-aminophenyl) disulfide in 2-aminothiophenol. The method comprises the following steps: preparing an acetonitrile solution of citric acid as a diluent; preparing a system applicability solution, a reference solution and a test solution by using a diluent; a diluent, a system applicability solution, a reference substance solution and a test solution are sequentially injected by adopting a liquid chromatography, and the content of bis (2-aminophenyl) disulfide in a 2-aminothiophenol sample is determined by adopting an external standard method. The antioxidant citric acid is added into the diluent, so that the generation of the disulfide compound is inhibited, the existing disulfide compound is not damaged, the solution stability is high, the operation is simple, the system applicability, specificity, accuracy, precision and durability completely accord with the guidance principle verified by the Chinese pharmacopoeia method, and the method is suitable for industrial production. The method can be used for quality control of 2-aminothiophenol.

The invention discloses a dual-band acridine formic acid anthracene methyl ester photocatalyst as well as a preparation method and application thereof, and belongs to the field of heterocyclic compounds. The invention designs and synthesizes a novel acridine formic acid anthracene methyl ester photocatalyst, which has good compatibility in two wavebands of 365 nm and 405 nm, can realize photocatalysis of disulfide compounds and aryl formyl peroxide compounds, and provides a new thought for preparation of sulfoxide compounds with asymmetric structures; the reaction conditions are mild, the reaction time is short, the photocatalyst can be recycled, the circulation loss is low, the circulation efficiency is high, the production efficiency is greatly improved, and the production period and cost are reduced; the product is free of transition metal residues and high in yield.

The invention belongs to the technical field of high polymer material synthesis, and particularly relates to UV-cured waterborne polyurethane acrylate resin as well as a preparation method and application thereof. The method comprises the following steps: preparing a disulfide bond and imine bond series dynamic bond monomer based on a Schiff base reaction of disulfide; a series dynamic bond monomer is introduced into waterborne polyurethane acrylate resin as a functional chain extender, and compared with light-cured resin with a single dynamic bond and a simple mixed dynamic bond, the series dynamic bond has lower activation energy, so that the light-cured coating based on the series dynamic bond is endowed with more excellent self-repairing performance; and meanwhile, the good mechanical property and excellent metal base material adhesive force of the coating are kept. The multiple dynamic bonds also enable the photocuring coating to have a multi-mode self-repairing capability, and the UV curing coating has excellent self-repairing performance under the stimulation of heat and ultraviolet.

Methods are provided for hydrothermal synthesis of porous crystalline materials. The method generally comprises forming a solution of precursors and reagents in effective ratios for a porous crystalline material including a fluoride-containing mineralizer, and water-soluble oxidized disulfide oil. The solution is hydrothermally treated under effective conditions and for an effective time to synthesize porous crystalline materials.

The invention belongs to the technical field of epoxy resin, and particularly relates to double-dynamic-bond synergistic exchange epoxy resin as well as a preparation method and application thereof. The preparation method of the double dynamic bond synergistic exchange epoxy resin comprises the following steps: adding aromatic dialdehyde and amino-containing disulfide into a solvent for condensation reaction, and filtering and drying to obtain a double dynamic bond curing agent; the preparation method comprises the following steps: adding the double-dynamic-bond curing agent into epoxy resin, carrying out ring-opening addition reaction, carrying out gradient heating curing, and cooling to room temperature, the aromatic dialdehyde is terephthalaldehyde, isophthalaldehyde or o-phthalaldehyde, and the amino-containing disulfide is 2, 2 '-diaminodiphenyl disulfide or 4, 4'-diaminodiphenyl disulfide. The invention designs and synthesizes a double-dynamic covalent bond curing agent containing an imine bond and a disulfide bond, and is used for constructing a novel degradable and self-healing epoxy resin. The material maintains good thermal stability and insulation performance, and realizes degradation and self-healing functions at the same time.

The invention discloses an antistatic coating and a preparation process thereof, and relates to the technical field of coatings. The antistatic coating is prepared from the following components: modified polyurethane emulsion, water-borne epoxy resin, water-borne acrylic resin, modified graphene oxide, a de-foaming agent and de-ionized water, the modified polyurethane emulsion contains a disulfide compound and dihydroxy quaternary ammonium salt; the modified graphene oxide is obtained by modifying cerium oxide and an amino coupling agent. According to the invention, the dihydroxy quaternary ammonium salt is prepared through amidation reaction and quaternization reaction in sequence, and the dihydroxy quaternary ammonium salt and the disulfide are used for modifying polyurethane together, so that the coating is endowed with antistatic and self-repairing properties; ce < 3 + > is loaded on the surface of the graphene oxide to form a more efficient conductive network, the antistatic performance of the coating is further improved, the amino coupling agent is connected with the cerium-loaded graphene oxide and the modified polyurethane to form a complex network structure, the dispersity of the cerium-loaded graphene oxide in the coating is improved, and agglomeration is reduced.

The invention provides a high-elasticity tear-resistant silicone rubber material and a preparation method thereof.The high-elasticity tear-resistant silicone rubber material is characterized by being prepared from, by mass, 100 parts of vinyl polysiloxane, 5-15 parts of phenylboronic acid end group modified polydimethylsiloxane and 1-5 parts of 2, 3-dihydroxypropyl disulfide, the adhesive comprises the following components in parts by mass: 10-30 parts of fumed silica, 1-5 parts of a cross-linking agent, 1-2 parts of a plasticizer and 0.001-0.005 part of a catalyst. By introducing the combination of phenylboronic acid end group modified polydimethylsiloxane and 2, 3-dihydroxypropyl disulfide, a dual dynamic covalent bond network with a stress triggering characteristic is constructed in a silicone rubber system, and when the material is subjected to external force, a disulfide bond is used as a sacrificial unit to preferentially break to dissipate energy and generate micro-voids, so that the stress triggering performance of the material is improved. And then stress-triggered boric acid ester bond dynamic recombination further disperses stress and stabilizes a micro-cavity structure, so that graded dissipation of energy is realized, crack propagation is reduced, and the elasticity and tear resistance of the material are improved.

The invention discloses a double dynamic bond self-repairing polyurethane elastomer as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The elastomer is prepared from the following raw materials in percentage by mass: 74 to 76 percent of polyether polyol, 15.5 to 18 percent of diisocyanate, 1.67 to 7 percent of dihydrazide compound and 2.1 to 6.7 percent of disulfide. The preparation method comprises the following steps: firstly, reacting polyether polyol with diisocyanate to obtain a prepolymer, then sequentially carrying out step-by-step chain extension reaction on the prepolymer, the bishydrazide compound and the disulfide compound, and finally, curing and forming. According to the invention, a synergistic structure of a hydrogen bond hard segment and a disulfide bond soft segment is constructed step by step, so that the material has high mechanical properties and efficient self-repairing capability. The elastomer is suitable for the fields of industrial pipeline sealing pieces, flexible packaging films, sports equipment accessories and the like, and solves the problem that the strength and repairing performance of an existing self-repairing polyurethane material are difficult to balance.

The application discloses a preparation method of a photo-thermal ice-resistant super-hydrophobic coating and the super-hydrophobic coating, and comprises the following steps: heating and vacuumizing polytetrahydrofuran (PTMG) to remove water, so as to obtain PTMG after water removal; heating and vacuumizing hydroxypropyl-terminated polydimethylsiloxane (PDMS-OH) to remove water, so as to obtain PDMS-OH after water removal; mixing the PDMS-OH after water removal and the PTMG after water removal, adding ethyl acetate solvent to stir, adding dicyclohexylmethane diisocyanate (HMDI) and dibutyltin dilaurate (DBTDL) dropwise, pre-polymerizing, adding di(2-hydroxyethyl) disulfide (HEDS) when the reaction reaches equilibrium, and preparing polyurethane after the reaction is completed; mixing ZrN nanoparticles, SiO2-F and the polyurethane to obtain a suspension through ultrasonic treatment; spraying the suspension to obtain a coating, and drying the coating to obtain the photo-thermal ice-resistant super-hydrophobic coating. The coating prepared by the application has excellent ice-resistant performance, and can delay the icing time for up to 1422s at-20 DEG C, and the icing time of a blank control group is 17s, which is better than most of the known ice-resistant super-hydrophobic coatings.

Provided is a rubber composition with which it is possible to obtain a vulcanized product and a vulcanized molded product having excellent wear resistance. According to the present invention, there is provided a rubber composition containing a chloroprene rubber, silica, a silane coupling agent, and a hydrate, the rubber composition containing 5-80 parts by mass of silica and 0.5-20 parts by mass or more of hydrate per 100 parts by mass of the chloroprene rubber, and the rubber composition containing 5-80 parts by mass of silica and 0.5-20 parts by mass of hydrate per 100 parts by mass of the chloroprene rubber. The content of a silane coupling agent is 0.5-15 parts by mass per 100 parts by mass of the silica, and the rubber composition satisfies at least one of the following conditions i) and ii): condition i) the rubber composition contains 3-methyl-thiazolidine-2-thione, and in the rubber composition, the content of 3-methyl-thiazolidine-2-thione is 0.5-15 parts by mass per 100 parts by mass of the chloroprene-based rubber, and the content of 3-methyl-thiazolidine-2-thione is 0.5-15 parts by mass per 100 parts by mass of the chloroprene-based rubber. The composition contains 0.1 to 3.0 parts by mass of 3-methyl-thiazolidine-2-thioketone; condition ii) the rubber composition contains a compound A and a compound B. The compound A is at least one compound selected from the group consisting of thiourea compounds, 3-methyl-thiazolidine-2-thione, and bis (5-mercapto-1, 3, 4-thiadiazol-2-yl) disulfides, and the compound B is at least one compound selected from the group consisting of thiourea compounds, 3-methyl-thiazolidine-2-thione, and bis (5-mercapto-1, 3, 4-thiadiazol-2-yl) disulfides. The compound B is at least one compound selected from the group consisting of thiuram-based compounds, sulfinamide-based compounds, thiazole-based compounds, guanidine-based compounds, benzimidazole-based compounds, N-phenyl-N-(trichloromethylthio) benzsulfonamide, and diazabicyclo-undecene-based compounds, and the content of the compound B is 100 parts by mass per 100 parts by mass of the chloroprene rubber. The rubber composition contains 0.1 to 3.0 parts by mass of a compound A and 0.01 to 3.0 parts by mass of a compound B.

The invention discloses a polyurethane modified low-temperature adaptive protective earplug material and a preparation process thereof, and belongs to the technical field of earplug materials. The earplug material comprises a component A, a component B, a component C and a component D, wherein the component A is prepared from isocyanate, 2-hydroxyethyl disulfide and octafluoro-1, 6-hexanediol; the component B comprises polyether polyol, perfluoropolyether glycol, polysiloxane, a foaming agent, a foam stabilizer, a dynamic cross-linking agent and a catalyst. 2-hydroxyethyl disulfide and octafluoro-1, 6-hexanediol are used for partially modifying a hard section of a polyurethane material, and perfluoropolyether glycol, polysiloxane and polyether polyol are grafted, so that the hardness of the earplug material at a low temperature is reduced through synergism of all the components, and the earplug material has low-temperature flexibility, tear resistance, hydrophobicity and pollution resistance; and low-temperature embrittlement can be avoided.

The invention is applied to the technical field of compound preparation, and discloses a synthesis method of o-aminothiophenol, which comprises the following steps: uniformly mixing 2-chloronitrobenzene, water and strongly basic anion exchange resin, heating, dropwise adding a hydrosulfide aqueous solution, carrying out heat preservation reaction, cooling and filtering after the reaction is finished, and drying to obtain the o-aminothiophenol. Eluting the filter cake with liquid alkali, acidifying and layering to obtain an o-aminothiophenol crude product, and distilling to obtain the product. The thiophenol and the basic group of the resin are salified, the main reaction for generating 2-nitrothiophenol is promoted in the early stage, and the generation of a nitroreduction byproduct 2-aminochlorobenzene is greatly reduced, so that the product yield is greatly improved; the product stability is improved by salifying, so that disulfides are prevented from being formed by bimolecular oxidation of thiophenol, reduction is not needed, the product can be obtained by acidification after alkali elution, the process is shortened, and the cost is reduced; the production process is simple to operate, pressure reaction is avoided, the requirement on equipment is low, and the yield is high and can reach 95% or above; the purity of the obtained product can reach 99% or above.

The invention provides a preparation method of bis-[3-(triethoxysilyl) propyl]-disulfide. The preparation method comprises the following steps: S1, under the protection of nitrogen, dropwise adding chloropropene and trichlorosilane into a non-polar solvent, a first catalyst and tripropylamine, reacting at room temperature, taking filtrate, dropwise adding the filtrate into alcohol in a micro-reflux state, reacting, adding a sodium alkoxide / alcohol solution for neutralizing, filtering, and distilling to obtain allyltriethoxysilane; and S2, under ultraviolet light, mixing allyltriethoxysilane, mercaptopropyltriethoxysilane and benzoin dimethyl ether, reacting at room temperature for 2-3 hours, adding sulfur and a second catalyst, carrying out heating reaction, removing low boiling points, cooling, and filtering. According to the preparation method provided by the invention, bis-[3-(triethoxysilyl) propyl]-disulfide is successfully and effectively synthesized, a phase transfer catalyst does not need to be introduced for catalysis, hydrolysis of silane and treatment of saline water are reduced, the yield of single-kettle synthesis is high, and the utilization rate of equipment is high.

The invention discloses a quantitative detection method for a mixture of bis (2-hydroxyethyl) disulfide and mercaptoethanol, and relates to the field of analysis and detection. The testing method comprises the following steps: respectively preparing a bis (2-ethoxyl) disulfide standard solution and a mercaptoethanol standard solution with different concentrations; and quantitatively measuring the standard solution and the detection sample through gas chromatography equipment, optimizing chromatographic conditions, drawing a standard curve according to the detection result of the standard solution, and quantitatively analyzing the detection sample by combining the standard curve and the spectrum of the standard solution. According to the present invention, the gas chromatography conditions are optimized, the phenyl functional group-containing polysiloxane is selected as the filler of the chromatographic column, and the detection temperature and the temperature rising program are controlled so as to ensure the separation and the detector sensitivity, and the split ratio is controlled to avoid the non-linear response and the peak overlapping; the detection accuracy of the bi-component bis (2-ethoxyl) disulfide and mercaptoethanol is high, the chromatographic peak separation degree is good, and the product quality detection requirement can be met.

The application provides an isomerized eucommia elastomer and a preparation method and application thereof. The isomerized eucommia elastomer forms cis-isoprene structure in the molecular chain through self-isomerization reaction. By regulating the content of cis structure, the regulation of the regularity of the molecular chain is realized, so that the isomerized eucommia rubber no longer crystallizes at room temperature and exhibits high elasticity. Meanwhile, the suitable regularity enables the isomerized eucommia rubber to have self-reinforcing capacity and exhibit excellent mechanical strength. The application also provides a preparation method and application of the isomerized eucommia elastomer. The isomerization modification of the eucommia rubber is carried out by using a mercapto compound or a disulfide compound under the initiation of a free radical initiator. The high-performance isomerized eucommia rubber elastomer material obtained by the application does not change the original chemical structure and polarity of the eucommia rubber, has similar structure and performance to natural rubber, can make up for the problem of insufficient yield of natural rubber, and has wide application prospects in the fields of tires, conveyor belts, sealing rings, wearable devices and the like.

The phenylenediamine-based antioxidant is used as a substitute for 6PPD, while improving scorch resistance and heat aging resistance. [Solution] The rubber composition according to the embodiment comprises a rubber component, a phenylenediamine-based antioxidant represented by the following formula (1), and a thiuram disulfide-based vulcanization accelerator. In formula (1), R 1 and R 2 Each of these independently represents a hydrocarbon group having 6 or more carbon atoms, however, R 1 and R 2 Except when it is a combination of a phenyl group and a 1,3-dimethylbutyl group. [Formula 1] JPEG2026103949000010.jpg42129

The present application relates to a kind of preparation method of extremely thin copper foil with metal-organic disulfide as composite stripping layer, belong to the manufacturing technical field of thin thickness copper foil, the present application uses direct current deposition to prepare metal stripping layer, the interface of carrier copper foil and metal stripping layer is stronger combined, then organic disulfide or organic disulfide salt is adsorbed between metal stripping layer and extremely thin copper foil, form organic stripping layer, obtain the composite stripping layer of surface uniformity, stable performance, effectively reduce the stripping strength of carrier copper foil, extremely thin copper foil is extremely thin and uniform, and the bonding force between composite stripping layer and carrier foil and extremely thin copper foil is different, can make the extremely thin copper foil before and after pressing be easily completely, stably and with carrier foil stripping.

An oral care composition is provided and includes a natural flavor extract, a sulfur source such as dimethyl disulfide, a stannous ion source, and a soluble metal ion source that prevents the formation of methyl mercaptan. The natural flavor extract may contain dimethyl disulfide as an impurity. The soluble metal ion source may include a metal salt, a metal oxide, or a combination thereof, and the soluble metal ion source may include a copper ion source, a silver ion source, a zinc ion source, or combinations thereof.

The invention belongs to the technical field of organic synthesis, and discloses a symmetric disulfide compound containing a sulfoxide group and application of the symmetric disulfide compound in glycosylation reaction, and the structural general formula of the compound is as shown in formula (I). According to the present invention, the compound represented by the structural general formula (I) contains sulfoxide and disulfide structures, and the sulfinyl forming the sulfoxide and the disulfide bond-containing group are located at the ortho-position of the aromatic ring, such that the compound can be used as the activation reagent for the glycosylation reaction, and particularly, activation of the glycosyl donor and glycosylation reaction can be efficiently promoted by only using 0.25 times of equivalent weight of the glycosyl donor, so that the use of a highly toxic, expensive, unstable or metal-containing activating reagent is avoided, and the problems that the activating reagent of the thioglycoside donor in the existing glycosylation reaction is unstable, is not easy to prepare and often needs equivalent weight or excessive amount are solved.

This invention discloses a method for preparing high-purity Si-75, comprising: S1, adding sodium sulfide, sulfur, and deionized water in a molar ratio of 1:(1.0~1.1):(5~8) to a reaction vessel, adding a buffer, and reacting at 80~90℃ for 1~2h; S2, adding a phase transfer catalyst and a hydrolysis inhibitor to the system, adding γ-chloropropyltriethoxysilane dropwise, and reacting at 85~95℃ for 3~5h, allowing the mixture to stand and separate into layers after the reaction, to obtain an organic phase; S3, subjecting the organic phase to short-path distillation and then filtering to obtain high-purity Si-75. Compared with existing technologies, this invention uses a phosphorus-free buffer system, which simplifies waste treatment. It uses water as the reaction medium and does not use large amounts of organic solvents, making it suitable for continuous industrial production. By adding hydrolysis inhibitors, hydrolysis can be effectively prevented during the reaction, increasing safety. The short-path distillation method provides high purification efficiency and can quickly remove impurities. The product has a disulfide content of ≥98.5% and a color of 0 (Gardner color number), which is of great significance to the light-colored rubber industry.

A method of reprocessing a polymer includes melt-processing molten polyolefin and an ensemble of crosslinker molecules dispersed in the molten polyolefin, each crosslinker molecule of the ensemble having a —Sn— moiety and having at least two polymerizable groups, where n is an integer of from 1 to 8, the melt-processing being carried out in the presence of a free radical generator, to produce a reversibly-crosslinked polymer network comprising crosslinker bonds derived from crosslinker molecules of the ensemble that are incorporated into the polymer network via said melt-processing, where crosslinker bonds are dissociable when the reversibly-crosslinked polymer network is reprocessed at temperatures of 50° C. or greater, and where, for at least 90% of the crosslinkers molecules in the ensemble, n is equal to 2.

The present invention relates to a composition (CR) for the permanent reformation of keratin fibres, comprising as components (A) at least one thiol-based reducing agent, (B) at least one alkalizing agent, (C) malic acid and / or a salt of malic acid, (D) at least one betaine, and optionally (E) at least one disulfide-based compound. Furthermore, the invention relates to a kit for permanently reforming keratin fibres, comprising a composition (CR) for permanently reforming keratin fibres and a neutralizing composition (CN) comprising at least one oxidizing agent. Another aspect of the invention is a method for permanently reforming keratin fibres.

The present disclosure provides a process. In an embodiment, the process includes providing a crosslinkable polymer composition. The crosslinkable polymer composition includes (i) a (polar) ethylene-based polymer having a melt temperature, Tm, (ii) a free radical initiator having a decomposition temperature, Tdecomp, (iii) 2,2,6,6-tetramethyl-4-piperidyl methacrylate disulfide (BiTEMPS methacrylate), and optional additives. The process includes mixing, in a mixing device, the crosslinkable polymer composition at a temperature greater than or equal to the decomposition temperature of the peroxide, and forming a BiTEMPS methacrylate grafted (polar) ethylene-based polymer (BIT-g-pPE).

This disclosure provides a vulcanized rubber with self-healing and recyclable properties, its preparation method, and its applications, belonging to the field of rubber materials technology. The vulcanized rubber provided in this disclosure has the following weight proportions: 100 parts rubber, 1-10 parts a copolymer obtained by copolymerization of sulfur and a sulfur-containing disulfide in the presence of a first catalyst, 1-3 parts a second catalyst, 1-3 parts zinc oxide, 1-2 parts an antioxidant, and 10-50 parts carbon black. This disclosure achieves the self-healing and recyclable functions of the vulcanized rubber. The vulcanized rubber material prepared by this disclosure is simple and readily available, which is beneficial for extending the shelf life of rubber products and protecting the environment.

The present invention relates to the use of a trivalent chrome plating bath composition for the electrodeposition of a hard chrome layer with a thickness of 1 µm or more, the composition comprising (A) trivalent chromium ions in an amount of 5-40 g / l, (B) at least one anion selected from sulfate, chloride, bromide and methanesulfonate, (C) at least one carboxylate ion selected from formate and acetate, (D) at least one buffer substance selected from ammonia, boric acid, carboxylic acids with 2 to 8 carbon atoms other than component (C) and salts thereof, and aluminium salts, and (E) 0.01 to 100 g / l of at least one specific compound which comprises a sulfonate group and a sulfide or disulfide group. Other aspects of the invention relate to a hard chrome plating process, a hard chrome plating layer and a hard chrome plated article.