401results about How to "Improve vulcanization effect" patented technology

The invention mainly relates to potting adhesive, in particular to a low-hardness and high-flexibility double-component condensed type organic silicon potting adhesive composition suitable for potting a light emitting diode (LED) display screen module. The composition comprises a component A and a component B, wherein the component A comprises a basic polymer, a filling material, a plasticizing agent and a deep curing agent; and the component B comprises a cross-linking agent, a tackifier and a catalyst. The component A and the component B are mixed according to designed proportion to have a cross-linking reaction so as to realize the effects of potting the LED display screen module, preventing adhesive layer cracking during repeatedly bending and folding LED tubes and providing excellent waterproof and dampproof properties.

Rubber mixtures, including at least one rubber, a filler, an organosilicon compound of the formula I

one rubber accelerator and one co-accelerator. The rubber mixtures are prepared by mixing at least one rubber, a filler, an organosilicon compound of the formula I, one rubber accelerator and one co-accelerator. The rubber mixtures can be used for production of moldings. Also disclosed is a process for preparation of the organosilicon compound of the formula I via transesterification.

The invention discloses a method for regenerating and pre-vulcanizing a hydrogenation catalyst, which comprises the following steps of: after carrying out charcoal burning on the inactivated hydrogenation catalyst, cooling to a certain temperature; and then directly carrying out suitable pre-vulcanizing treatment and passivating treatment outside a device. In the method disclosed by the invention, the regeneration and vulcanization of the inactivated hydrogenation catalyst are organically combined, so that the generated catalyst is directly subjected to pre-vulcanizing and passivating treatment without being cooled, active metal components can be in a certain active state, and at the time, if the pre-vulcanizing is directly carried out, the vulcanizing effect and the utilization rate of a vulcanizer can be improved. A test shows that in the process, the activity recovery effect of the regenerated catalyst can be improved and the service performance of the regenerated catalyst can be improved. Meanwhile, due to the adoption of the method disclosed by the invention, the energy consumption can be reduced, the production cost is reduced and the production period is shortened.

The process of treating hydrogenation catalyst before application includes making the hydrogenation catalyst in oxide state to support organic acid and/or organic nitrogen compound, organic solvent and element sulfur and treating in dynamic heating equipment. The hydrogenation catalyst with supported sulfur containing matter, such as element sulfur, has raised sulfur containing matter utilization rate, smooth temperature raising in the catalyst bed, raised catalyst activity and other features. The method of the present invention may be applied for various kinds of hydrogenation catalyst.

The present invention relates preparation process of vulcanized catalyst. During the preparation process, thiram in 0.5-25 wt% of the catalyst, sulfur element in 30-150 % of the theoretic sulfur demand of the catalyst and organic solvent in 0.1-50 wt% of the catalyst are first introduced into the catalyst in oxide state, and the catalyst is then heat treated in dynamic heating apparatus. The catalyst has raised sulfur holding rate, smooth heat release, shortened vulcanizing period and raised production efficiency. The method of the present invention may be used in the treatment of various kinds of hydrogenating catalyst before application.

The invention discloses a high-temperature-resistant rubber sealing ring for automobiles. The high-temperature-resistant rubber sealing ring comprises the following raw materials in parts by weight: 70-90 parts of ethylene-propylene-diene-terpolymer rubber, 10-30 parts of chloroprene rubber, 1-4 parts of an anti-aging agent, 0.8-1.5 parts of active zinc oxide, 0.2-0.4 part of magnesium oxide, 0.5-1.0 part of calcium oxide, 0.6-1.5 parts of butyltin mercaptide, 30-40 parts of modified kaolin, 10-15 parts of magnesium methacrylate, 1-3 parts of a promoter, 6-10 parts of soybean oil, 1-2 parts of ethyl methacrylate, 40-80 parts of paraffin oil, 0.2-0.5 part of triallyl phosphate, 1.0-1.5 parts of a crosslinking agent BIBP, 0.5-1.2 parts of an assistant crosslinking agent TAIC, 0.3-0.5 part of microcrystalline wax, 2-3 parts of a vulcanizing agent and 0.5-1 part of phthalic anhydride. The sealing ring disclosed by the invention has strong weather resistance, corrosion resistance and ozone resistance, and can be suitable for being used as the high-temperature-resistant rubber sealing ring for the automobiles.

The invention relates to the technical field of silicone rubber, and particularly relates to a ceramic fire-resistant and flame-retardant silicone rubber and a preparation method thereof. The ceramic fire-resistant and flame-retardant silicone rubber is composed of a component A and a component B in a weight ratio of 0.8-1.2: 1. The component A comprises the following raw materials in weight part: 60-140 parts of silicone rubber A, 35-45 parts of reinforcing agent, 60-100 parts of filler A, 11.4-17.2 parts of silane auxiliary agent A, 0.15-0.25 part of lubricant A, 0.1-0.3 part of flame retardant, and 0.5-1.5 parts of vulcanizing agent. The component B comprises the following raw materials in weight part: 60-140 parts of silicone rubber B, 230-290 parts of filler B, 3-6 parts of silane auxiliary agent B, and 0.2-0.4 part of lubricant B. According to the technical scheme of the invention, the ceramic fire-resistant and flame-retardant silicone rubber is good in fire-resistant and flame-retardant property, and excellent in comprehensive performance.

The invention discloses a sulfuration method of a catalyst for hydrocracking technology. The method is as below: (1) a normally running wax oil hydrotreatment apparatus or a residuum hydrotreatment apparatus; (2) hydrocracking technical apparatuses comprise a hydrocracking reactor and a selectable hydrocracking pre-refining reactor; (3) adjusting a desulfurization rate of a recycle hydrogen sulfureted hydrogen removal apparatus in the normally running wax oil hydrotreatment apparatus or the residuum hydrotreatment apparatus; (4) introducing sulfureted hydrogen-containing gas emitted from the recycle hydrogen sulfureted hydrogen removal apparatus in the normally running wax oil hydrotreatment apparatus or the residuum hydrotreatment apparatus to the hydrocracking unit and carrying out sulfuration operation on the hydrocracking unit; (5) carrying out sulfuration according to normal conditions of a dry sulfuration method of a hydrocracking unit until completion. The method of the invention can increase sulfuration efficiency and reduce vulcanizing agent consumption.

The invention discloses a low-volatility benzothiazolyl mercaptosilane and a preparation method thereof. A molecular structural formula of the low-volatility benzothiazolyl mercaptosilane is shown in the patent specification. The preparation method of the low-volatility benzothiazolyl mercaptosilane comprises the following steps that 1, a polyether and a chloroalkyl silane undergo a reaction at a temperature of 30 to 180 DEG C in the presence of one or more catalysts; and R3-H is separated from the reaction products so that a silane semi-finished product is obtained; and 2, 2-mercaptobenzothiazole is added into an organic solvent; and one or more alkalis and semi-finished silane are added into the 2-mercaptobenzothiazole solution to undergo a reaction with stirring at a temperature of 20 to 120 DEG C in a nitrogen atmosphere for 0.5 to 24 hours; the reaction products are subjected to filtration, washing and reduced pressure distillation to produce a brown-red liquid desired product. The low-volatility benzothiazolyl mercaptosilane can release a small quantity of alcohols, can improve reinforcing effects, mechanical properties and dynamic mechanical properties of vulcanized rubbers, and rolling resistance and wet skid resistance of tread rubber, has long scorch time and fast sulfuration speed, and can improve greatly sulfuration performances of rubber materials.

A process for treating the hydrocatalyst before it is used features that the organic solvent and sulfur-contained substance are introduced to the oxidation-state hydrocatalyst for higher activity.

An improved polymerization and work-up process makes it possible to produce specific nitrile rubbers which have a particular ion index which is responsible for an excellent vulcanization rate and leads to vulcanizates having an advantageous property profile.

The invention provides a catalyst for hydro-denitrification of inferior heavy distillate oil and a preparation method and application of the catalyst. The preparation method comprises the following steps of: performing surface acid treatment on aluminum oxide and an HY molecular sieve separately; mechanically compounding the aluminum oxide subjected to the acid treatment and the HY molecular sieve subjected to the acid treatment into a carrier; dipping steeping liquid containing catalyst active components to load the catalyst active components; and drying to obtain the catalyst for hydro-denitrification of heavy distillate oil. In the carrier, the content of the HY molecular sieve subjected to the acid treatment is 5 to 20 percent, the active components comprise Mo and/or W, and Co and/or Ni, the steeping liquid also comprises a complexing agent, the Mo and/or W oxide content of the catalyst is 10 to 30 percent, and the Co and/or Ni oxide content of the catalyst is 1 to 10 percent. The catalyst has the characteristics of reasonable acidic distribution, a large number of active metal stacking piles and complete metal vulcanization, has a high hydro-denitrification activity to the inferior heavy distillate oil, and has high hydro-desulfurization performance.

The invention relates to a processing method before the application of hydrogenation catalyst, comprising the detailed process as follows: organic solvent, elemental sulfur and water are introduced in oxidated hydrogenation catalyst; subsequently, heating predisposal is carried out under a certain condition. The processing method before the application of the hydrogenation catalyst loads the sulfur-contained substance such as the elemental sulfur to the hydrogenation catalyst; a certain interaction is generated and little heat is discharged; and the water vapor which is generated during the heat disposal process of the added water adjusts the interaction of the sulfur and the catalyst and reduces the heat discharging degree during the heat disposal process. Compared with the prior art, the catalyst obtained by the method has the advantages of high utilization ratio of the sulfur-contained matter, gradual increment of the temperature of the catalyst bed and high activity of the catalyst when the activation is applied. The method can be used for processing before the application of various hydrogenation catalysts.

The invention relates to a segmental pre-vulcanizing method of a sulfur tolerant shift catalyst in a multi-segment conversion process, particularly relates to a method for rapidly pre-vulcanizing cobalt-molybdenum-series sulfur tolerant shift catalysts and belongs to the technical field of pretreatment of the sulfur tolerant shift catalyst. According to the method, aiming at the situations of the temperature raising and the slow vulcanizing speed caused due to insufficient vulcanizing conditions, a segmental vulcanizing method is utilized, namely the rapid pre-vulcanizing of a first-segment furnace is reinforced to raise the temperature of a subsequent second-segment furnace; first-segment vulcanizing conditions are reinforced to guarantee the vulcanization of the catalyst so as to realize the rapid, efficient and complete vulcanization, meanwhile, the temperature of a subsequent second-segment bed is raised by high-temperature vulcanized gas in a rapid vulcanizing process, and the subsequent working segments are similarly processed, so that the vulcanizing and temperature raising time is greatly shortened, and the vulcanizing cost is lowered; by utilizing a circular vulcanizing manner, the emptying quantity is few, the overtemperature is avoided, the vulcanizing process is convenient and safe, the pollution is light, and the method has remarkable economic and social benefits.

The invention relates to degradable highly-elastic sponge and a preparation technology thereof. The degradable highly-elastic sponge and the preparation technology thereof have the advantages that thedegradable highly-elastic sponge is made of green, natural and healthy materials according to the environment-friendly preparation technology, harmless to human bodies and capable of avoiding resource waste and environment pollution, and its mechanical properties including rebound resilience and compression set value are in compliance with the international standards; through adoption of recyclable pineapple fibers, resource waste is reduced and physical properties of low-density sponge with natural latex matrixes are improved to comply with the international standards; sodium alcohol ether sulphate and sodium lauryl sulfate which serve as foaming agents substitute for traditional pollutional ones to further avoid pollution; the high-performance low-density sponge with the excellent mechanical properties can be produced at a low preparation cost; the preparation technology is safe, simple and environment friendly.

The invention provides a controlling method for wrapping the surface of a tire, comprising the following steps: an industrial personal computer (IPC) analog simulates the deformation of rubber pieces in the process of spire piling and the arrangement distribution situation of the each rubber piece in the surface of the tire to obtain spire pitches among each rubber piece; the IPC computes the virtual circle central coordinate and the radius of a wrapper at each loop of the arc of the surface of the tire, and sends a date to a PLC; the IPC respectively computes the arc of the each loop of the arc section of the surface of the tire, the horizontal coordinate of the each loop of the linear section of the surface of the tire and a corresponding theoretical velocity, to form a data table to be sent to the PLC; the PLC computes the real velocity of the wrapper according to the received data table; and the PLC computes to obtain a track coordinate data of the wrapper corresponding at the each loop and finally controls the wrapper to wrap the surface of the tire. The method realizes analog simulation in the process of wrapping the surface of the tire, adjusts the walk track and the walk velocity of the head of the wrapper immediately, and greatly improves the wrapping quality of the surface of the tire.

The invention discloses a powder rubber preparation method, and relates to the technical field of rubber preparation. The powder rubber preparation method comprises three process steps of performing ball milling, stirring and performing spray-drying. According to the method disclosed by the invention, the hydrophilicity of carbon black can be improved through wet ball milling processing; sodium dodecyl benzene sulfonate serving as a surfactant is favorable to the diffusion of the carbon black in natural latex; the carbon black and the natural latex are mixed and are fully stirred, so that a carbon black/natural latex suspension in a stable state is favorably prepared; under similar conditions, compared with mechanically mixed rubber material, the curability of the powder rubber prepared by the spray-drying method is greatly improved, the peak value of the torque of a vulcanization curve is improved by about one time, the scorch time in rubber preparation can be effectively shortened, and the preparation process is simple.

The invention relates to a deformed nickel-based alloy and a brazing process of a cast Ni3Al-based alloy. The process comprises the following steps of carrying out surface treatment on a to-be-weldedpart of a to-be-welded base material; a nickel-based brazing filler metal, a brazing flux and a gel binding agent are mixed into paste, the paste-shaped brazing filler metal is laid on the surface ofthe to-be-welded base material, the other to-be-welded base material is stacked on the brazing filler metal to obtain the lap-jointed brazing sample; placing the lap-jointed brazing sample in a clampand putting in a tube furnace; after the brazing assembly is placed in a tube furnace, introducing protective gas, then heating to 1150 -1200 DEG c in a segmented manner; performing segmented coolingafter welding, cooling to room temperature; placing the welded sample which is cooled to room temperature in a box furnace under atmospheric conditions for treatment, wherein the heat preservation temperature is 600-650 DEG c, the time is 2-4 hours, and then taking out after cooling to room temperature along with the furnace. According to the process, the oxidation of the Ni-Cr-Al-based cast Ni3Al-based high-temperature alloy can be avoided, the base material is not damaged, the components of the joint are uniform, the high-temperature resistance of the welded joint is improved, and the residual stress is reduced.

The invention relates to magnetic shock-absorption rubber and nanophase magnetic ferrite particles, specifically a process for preparing the nanophase magnetic ferrite particles and magnetic shock-absorption rubber prepared by using the nanophase magnetic ferrite particles. The invention is used for resolving the problems that the existing magnetic particles can not meet the physically mechanical property and magnetic shock-absorption effect of magnetic shock-absorption rubber and materials of the existing magnetic shock-absorption rubber are not properly selected and matched. 1.4-5.11g FeCl3, 6H2O, 1.75-6g FeSO4, 7H2O and 0.00025 mol polyethylene glycol with molecular weight of 400-10000 are added into 560ml distilled water, and further sodium hydroxide solution is added into the mixture, thereby nanophase magnetic ferrite particles which has certain shape and is coated by polyethylene glycol is achieved. The magnetic shock-absorption rubber is composed of components with percentage by weight of plantation rubber 15-60%, ethylene-propylene-diene monomer 15-60%, nanophase magnetic ferrite particles 5-50%, vulcanized agent 1-10%, vulcanizing activator 1-10%, vulcanization accelerator 1-10%, aging inhibitor 0.1-5% and reinforcing agent 10-40%.

The present invention relates to hydrocarbon hydrotreating process including the steps of loading catalyst into the reactor, activating, reaction, etc. The hydrotreating catalyst contains thiram matter in 0.5-25 wt% of the catalyst, simple substance sulfur in the amount of 30-150 % of the theoretical sulfur demand of the catalyst, and organic solvent in 0.1-50 wt% of the catalyst. The hydrotreating catalyst with the common action of thiram matter, sulfur and organic solvent has high sulfur holding rate in activation, less concentrated heat release, lowered temperature rise in the catalyst bed and high activity. It may be applied in various kinds of hydrocarbon hydrotreating process.

The invention relates to a preparation method of a high-medium oil selective hydrocracking catalyst. The invention firstly provides a preparation method of a Y-molecular sieve/ Si-Al oxide composite catalytic material, comprising the steps of: synthesizing a Y-molecular sieve by a guide agent method, controlling the synthesis temperature of mother solution to be below 0 DEG C, the ageing time to be 4-8h, the crystallization temperature to be 90-95 DEG C and the crystallization time to be 9-18h, and obtaining slurry formed by the Y-molecular sieve and the rest crystallization liquid; carrying out ammonium exchange treatment on the Y-molecular sieve, and obtaining the mixed solution; and adding an Al source and a Si source into the mixed solution, adjusting the pH value to be 6-10 to form gel, drying the gel, and obtaining the composite catalytic material. The invention also provides the preparation method of the high-medium oil selective hydrocracking catalyst, comprising the following steps of: preparing the Y-molecular sieve/Si-Al oxide composite catalytic material according to the method; taking the composite catalytic material as a carrier for carrying active components; and obtaining the high-medium oil selective hydrocracking catalyst by drying and calcining.

The present invention provides carbon black for a functional rubber component which can provide rubber with an excellent set resistance and a high UHF vulcanization performance by high frequency induction heating. The carbon black has a nitrogen adsorption specific surface area (N₂SA) of 15 to 30 m²/g and a DBP absorption of 100 to 135 cm³/100 g, and satisfies the relationship of the following formulas (1) and (2).

460−10.5×N₂SA≧Dst  (1)

2900≧H   (2)

wherein N₂SA denotes the nitrogen adsorption specific surface area (m²/g), Dst denotes the modal diameter (nm) of a Stokes diameter distribution of carbon black aggregates, and H denotes the hydrogen content (μg/g) per 1 g of carbon black.

The invention discloses a startup presulfurization method of a hydrogenation catalyst. The method consists of: collecting the sulfur-containing effluent gas of a refinery plant, first conducting light hydrocarbon absorption to remove the light hydrocarbon with a high content of C1-C4, and enhancing the hydrogen purity and hydrogen sulfide concentration; then mixing the effluent gas with a circulating gas in a high pressure separator, and passing the gas generated in the high pressure separator through a circulating hydrogen desulfurization tower; and adjusting the operations on the desulfurization tower to control the concentration of hydrogen sulfide in circulating hydrogen, thus finishing sulfurization of the hydrogenation catalyst. The method provided in the invention can, on the one hand, cancel the consumption of a sulfurization agent, and on the other hand can perform optimization treatment on the sulfur-containing effluent gas, so that a more convenient and economical approach can be found for governance of sulfur-containing exhaust gases from refinery plants while startup sulfurization of hydrogenation equipment is completed.