60 results about "Rubber chemicals" patented technology

A sheet-like gasket having a dense structure and exhibiting excellent sealing performance with a small clamping force even on an irregular flange surface is provided. The sheet-like gasket is obtained by molding a composition comprising a substrate fiber, a rubber material, a filler, and a rubber chemical into a sheet, having a bead on both sides or one side, and having a flat part with a density of 1.0 g/cm³ or higher, the bead having a density lower than the density of the flat part.

The invention discloses a sulfur-containing silane coupling agent and a preparation method thereof. The structural general formula of the sulfur-containing silane coupling agent is as follows (see the specification), wherein n=2-10, Z is perssad (R1O) m (G) 3-mSi, m is 1 or 2, R1 is methyl or ethyl, G is (R2) (O (CR' R'') x) yO, x=2-10, y=1-20, R2 is alkyl, R' is hydrogen, alkyl or phenyl, and R'' is hydrogen or alkyl. The preparation method is simple and reliable, and the prepared sulfur-containing silane coupling agent can be widely used in rubber chemicals to effectively improve the rubber performance.

The invention relates to a grafting type comb polymer solid electrolyte material and a preparation method thereof. The raw material comprises epoxidized natural rubber, methoxy polyethylene glycol carboxylic acid and lithium perchlorate, a flexible segment is introduced in the epoxidized natural rubber through a grafting reaction, the graft methoxy polyethylene glycol carboxylic acid provides the high segment motion ability and the ability of interaction with lithium salt, and ether oxygen atoms on the graft act with lithium perchlorate to dissociate the lithium perchlorate into lithium ions and form a coordinated complex. Compared with the prior art, no other plasticizer or active agent or vulcanization accelerator or rubber chemical is introduced, no small molecule product residue exists in the prepared material, and the electrochemical stability and ionic conductivity of the electrolyte can be improved.

The invention relates to a preparation method of durable ultrahigh temperature resisting acrylic rubber, belonging to the field of rubber chemical synthesis. In the method, an acrylic ester monomer, a low-temperature monomer and a vulcanization site monomer are used as comonomers, deionized water and an emulsifying agent are used for assisting, and a complex initiator system in the process that emulsion polymerization is initiated by a chemical method is removed, so that the process formulation is simplified. In the preparation method, high-energy radiation at room temperature is adopted to initiate emulsion polymerization reaction, pre micro crosslinking is adopted to increase gel content in crude rubber, so as to improve the average molecular weight of the crude rubber and finally achieve the purposes of improving heat-resisting upper limit of the acrylic rubber. Acrylic rubber (ACM) products can be used for a long time under a high-temperature oil seal environment of 170 DEG C, andcan be used for a short time intermittently under the temperature with 200 or more than 200 DEG C, and simultaneously has good mechanical processing property.

The invention provides a method for treating rubber chemical wastewater by microwave enhanced microelectrolysis combined oxidation. The method is characterized by comprising the following steps: pre-oxidizing wastewater, and carrying out microelectrolysis treatment; carrying out microwave radiation after organic matters in rubber chemical wastewater are subjected to ring-opening and chain.-scission; enhancing the treatment effect of microelectrolysis and oxidation by utilizing the electromagnetic effect of microwave, and quickly heating the wastewater by means of the heat effect of microwave. According to the method, the oxidation speed can be accelerated by means of temperature rising, so that separation of organic matters can be favored, a subsequent flocculation reaction is accelerated, and the total amount of sludge of wastewater can be reduced; and multiple processes are gradually combined for rubber chemical wastewater treatment, so that discharge of the wastewater with standard level at relatively low cost can be realized.

The invention belongs to the technical field of rubber chemical modification, and relates to a preparation method and a use of a modified nature latex. The modified nature latex is prepared from the following components by weight: 100 parts of nature latex, and 10-30 parts of sericin grafted aqueous polyurethane emulsion. According to the present invention, the modified rubber has advantages of surface functionalization, good biocompatibility and the like; the mechanical property and the allergy of the nature latex gloves are improved; and the traditional method that the protein removing method is adopted to solve the allergy of the latex product is changed, the allergy problem is solved without reduction of the protein content, and the physical and mechanical properties of the latex product are ensured.

The invention discloses sulfur pre-dispersing mother rubber particle and a preparation method thereof and relates to a rubber chemical. The sulfur pre-dispersing mother rubber particle is composed of the following components by mass: 80 parts of sulfur powder, 16 parts of base materials, 1 part of stearic acid and 3 parts of white oil, wherein the used base materials are composed of ethylene-propylene-diene monomer (EPDM), ethylene-vinyl acetate copolymer (EVA) and polyolefin elastomer (POE), the type of the used EPDM is 4045, the content of vinyl acetate in the EVA is 30%, and the type of the POE is 8108. The sulfur pre-dispersing mother rubber particle is pre-dispersing mother rubber particle obtained by evenly dispersing sulfur powder into a carrier and performing pelleting. The sulfur pre-dispersing mother rubber particle is particularly suitable for being applied to a formula of tread rubber, and can solve the problems of dust, mixing rate and the like in mixing of the tread rubber.

A non-asbestos gasket sheet including a composition which includes a base fiber containing an organic fiber as a major fiber component, rubber, a filler, and a rubber chemical, the amount of the organic fiber in the composition is 15 to 30 wt %, and the filler including graphite. The non-asbestos gasket sheet exhibits tensile strength equivalent to or greater than that of an asbestos joint sheet, and can be used under high temperature conditions.

A non-asbestos gasket sheet comprising 30% or more of the organic fiber obtained by forming a sheet from a slurry containing an organic fiber, a rubber, fillers, and rubber chemicals, followed by drying and rolling. The obtained gasket sheet possesses excellent sealing properties and tensile strength.

The invention discloses a method for reclaiming sulfur from a byproduct of acid gas generated in the production of rubber chemicals. The method overcomes the defects that the conventional Claus furnace has low hydrogen sulfide transformation reclaiming ratio, high energy consumption and the like, and adopts a novel process to generate the sulfur by mixing hydrogen sulfide and air according to a volume ratio of 1:2 in a sulfur production combustion furnace, and adopting a straight flow partial combustion process to perform high temperature hot reactions, namely a first-stage high temperature hot reaction, a second-stage high temperature hot reaction, a third-stage catalytic conversion and a fourth-stage condensation cooling. The method has the advantages of advanced and mature process route, safety and reliability, high automation degree, convenient operation and low energy consumption.

A multi-functional rubber ingredient and a preparation method thereof relate to the chemical engineering accessory ingredient and the preparation method thereof. Starch derivate is prepared by adding a strong alkaline solution component A with 15 percent of concentration, a halogenating epihydrin component B and a carbon bisulfide component C to the mixed solution of starch and sodium chloride, and then the multi-functional rubber ingredient is obtained by adding a strengthening agent, a coupling agent and a plasticizer. Firstly the starch xanthate is prepared, and then 100 parts of prepared starch xanthate are used as base stock, then the multi-functional rubber ingredient is obtained by adding 20 to 25 parts of strengthening agent, 0.1 to 1 part of coupling agent and 3 to 10 parts of plasticizer. Using the method to prepare the multi-functional strengthening agent has the simple technique and high grafting ratio, so the multi-functional strengthening agent has good effect when being used as a tyre rubber ingredient and processing an accelerating agent.

The invention belongs to the technical field of rubber chemical modification, and discloses a sericin graft-modified natural latex, a preparation method and applications thereof. The natural latex comprises following ingredients, by weight, 50 to 100 parts of natural latex, 25.3 to 69.6 parts of a sericin water solution, 0.2 to 1.0 part of a first initiator, and 0.2 to 1.0 part of a second initiator. The preparation method comprises following step: in nitrogen atmosphere, 50 to 100 parts of natural latex and 25.3 to 69.6 parts of the sericin water solution are stirred with a uniform speed; 0.2 to 1 part of the first initiator is added dropwise; and 0.2 to 1.0 of the second initiator is added dropwise at a uniform speed; and an obtained mixture is subjected to polymerization, and is allowed to stand so as to obtain the sericin graft-modified natural latex. The preparation method is based on surface energy difference of sericin and natural latex, and sericin is gathered at the surface of natural latex so as to isolate allergic proteins. At the same time, hydrogen-bond interaction between amino acids in sericin and allergic water soluble proteins in natural laxe is induced, and the allergic water soluble proteins are denatured, so that occurrence possibility of induced allergic reaction is reduced greatly without influencing rubber physical and mechanical properties.

The invention relates to a synthetic method for a novel rubber chemical--bis-[gamma-(trimethoxy)silylpropyl]tetrasulfide. The method comprises the following steps: with methanol as an esterification agent, esterifying gamma-chloropropyltrichlorosilane into gamma-choropropyltrimethoxysilane; with methanol as a solvent, preparing a sodium hydroxide methanol solution with a mass concentration of 20 to 25% and reacting the sodium hydroxide methanol solution with a certain amount of sulfur powder at 50 to 60 DEG C; and pouring the prepared sodium sulfide solution into a synthetic kettle, adding a catalyst--cetyltrimethylammonium bromide prepared in advance, then adding gamma-choropropyltrimethoxysilane and judging reaction process according to color changes of a reaction solution and production of the by-product NaCl. According to the invention, methanol is used as a starting raw material, sulfur content of the novel rubber sulfur-containing silane coupling agent is increased, and production cost is substantially reduced; methanol is used both as an esterification reagent participating in reaction and as a solvent and can be easily separated from the prepared rubber sulfur-containing silane coupling agent by using a distillation method due to the low boiling point, and the purity of the prepared rubber sulfur-containing silane coupling agent is more than 99%.

The invention discloses a device and a method of automatic material distribution of a vulcanization forming blank of a framework O-shaped seal ring, and belongs to the technical field of rubber chemical engineering machinery equipment. The device comprises a base, a conveying mechanism, a first material distribution mechanism, a second material distribution mechanism and a PLC controller, whereinthe PLC controller is electrically connected with the first material distribution mechanism, the second material distribution mechanism and the conveying mechanism, and two guide rails and a pluralityof fixing bases are arranged on the base in parallel; the conveying mechanism is used for driving a movable material plate to carry out comprehensive material distribution, and the first material distribution mechanism is used for transporting the O-shaped sealing ring blank or an annular steel sheet to a belt conveyor from a hopper; and the distance between a blanking and material falling pointof a material distributing hopper of the first material distribution mechanism and a blanking and material falling point of the material distribution hopper of the second material distribution mechanism is an integer N times of the hole distance of the movable material plate, wherein N is large than or equal to 1 and less than or equal to 8. According to the device and the method, the material which is distributed rapidly in rows and multihole manner is realized, so that the distribution efficiency and automation are improved, the condition of the automatic combination of a material distribution process and a vulcanization feeding process is provided.

The invention provides a measuring method for content of 2, 2'-diphenyle formamidodiphenyl disulphide (DBD) in a rubber chemical peptizer. The measuring method comprises the following steps: adding a solvent to dissolve a sample, testing filtrate by use of an efficient liquid-phase chromatographic instrument after filing by use of a filter film, and quantitatively measuring the content of the DBD in the sample by comparing with a DBD standard solution. The measuring method disclosed by the invention is flexible in chromatographic column and detector type selection, simple and easy in pre-treatment process, short in analysis time, and high in precision and accuracy, and adopts normal and easily available reagents.

The invention discloses a processing process and a processing system of high-concentration organic wastewater with rubber chemicals. The processing process comprises steps of removing salt in the wastewater and regulating pH; performing activated carbon catalyst catalysis oxidation reaction on the wastewater and regulating pH; removing suspended matters in the wastewater; removing COD and salinityin the wastewater; removing COD and organic matters in the wastewater; and deeply oxidizing the wastewater and adding H2O2 and then discharging. The processing process can treat high-concentration organic wastewater with rubber chemicals and discharge the wastewater reaching the standard. The processing system has the advantages of being low in cost, occupying a small area, simple operation conditions, and being suitable for large-scale treatment.

The present invention relates to predispersions of rubber chemicals and to a process for the preparation thereof. The present invention also relates to a novel polymeric composition for dispersing a rubber chemical and to a process for the preparation of said composition.