75 results about "Mooney viscosity" patented technology

The present disclosure provides a process. In an embodiment, the process includes providing a neat ethylene / propy-lene / non-conjugated polyene terpolymer (n-terpolymer) having a Mooney viscosity (ML (1+4) at 125C) less than 100 Mooney units (MU). The process includes exposing the n-terpolymer to electron beam radiation at a dosage from 0.2 megaRad (MRad) to 1.3 MRad. The process includes forming a branched ethylene / propylene / non-conjugated polyene terpolymer (b-terpolymer) having a Mooney viscosity ML (1+4) at 125C from 25 MU to 135 MU.

This invention discloses a EPDM rubber and its preparation method, comprising copolymerizing the EPDM rubber from a first structural unit provided by ethylene, a second structural unit provided by propylene, and a third structural unit provided by a polyene monomer. This invention achieves precise control of the molecular structure of the EPDM rubber by introducing a polyene monomer with a specific structure as the third monomer, and combining it with a restricted geometry catalyst or a vanadium-based catalyst, thereby improving the uniformity of the copolymer and the vulcanization efficiency. The resulting rubber exhibits a narrow molecular weight distribution, suitable Mooney viscosity, and good processing properties, making it suitable for high-performance rubber products. The preparation method is simple, environmentally friendly, and easy to industrialize.

The application belongs to the field of rubber modification, and discloses a preparation method of polystyrene in-situ reinforced 1,2-polybutadiene rubber, a product and application. The preparation method comprises the following steps: (1) under a protective atmosphere, a styrene solution is subjected to a polymerization reaction in the presence of a first molybdenum catalyst to obtain a mixture containing polystyrene; (2) the mixture containing polystyrene is mixed with a second solvent, butadiene and a second molybdenum catalyst, and subjected to a second polymerization reaction under a protective atmosphere to obtain in-situ blended polystyrene / 1,2-polybutadiene rubber. The mechanical strength of the modified rubber is obviously improved, the Mooney viscosity is low, the processing performance is better, the molecular weight is high, the content of 1,2 structure is high, the wet skid resistance, heat generation and rolling resistance performance of the rubber are improved, the rubber is suitable for tires and products, the application range of 1,2-polybutadiene rubber is further widened, and the rubber has extremely high application value.

The present application relates to the technical field of rubber processing aids, and particularly relates to a dispersant for rubber, a preparation method and application thereof.The dispersant for rubber comprises the following raw materials in parts by weight: 20-30 parts of stearic acid, 5-10 parts of microcrystalline wax, 1-5 parts of monoglyceride fatty acid ester, 2-7 parts of dispersing aid, and 1-5 parts of modified sodium lignosulfonate.The dispersant for rubber can improve the wetting and coating capacity of fillers, reduce the Mooney viscosity of rubber compounds, and improve the flowability of mixing and processing.In addition, the dispersant for rubber can improve the dispersion uniformity of fillers in the rubber system, and improve the interfacial bonding strength between fillers and rubber.Meanwhile, the dispersant for rubber can effectively avoid the migration and blooming of small molecule additives, and improve the appearance stability of rubber products.

This modified conjugated diene polymer satisfies conditions (i) to (v) described below. Condition (i): The Mooney viscosity measured at 100ºC is 100 or more. Condition (ii): The glass transition temperature is -95°C to -45°C. Condition (iii): The content of silicon atoms is 170 ppm or more relative to the total amount of the modified conjugated diene polymer, and the mass ratio of the content of silicon atoms to the content of nitrogen atoms is 3 or more. Condition (iv): The modification rate is 70 mass% or more. Condition (v): The degree of branching (Bn) as determined by a GPC-light scattering measurement method with a viscosity detector is 6 or more.

The invention discloses a high-insulation heat-resistant ethylene propylene diene monomer rubber material which is prepared from the following raw materials in parts by weight: 40-50 parts of low-Mooney-viscosity ethylene propylene diene monomer rubber, 40-60 parts of medium-Mooney-viscosity ethylene propylene diene monomer rubber, 10-30 parts of high-Mooney-viscosity ethylene propylene diene monomer rubber, 5-15 parts of zinc oxide, 1-3 parts of stearic acid, 1-2 parts of an anti-aging agent MB, 1-2 parts of an anti-aging agent RD, 1-2 parts of a flow promoter and 2-10 parts of tackifying resin, 25-55 parts of carbon black, 40-75 parts of an inorganic filler, 1-2 parts of a coupling agent, 5-20 parts of a plasticizer, 4-12 parts of a vulcanizing agent and 1-5 parts of a cross-linking auxiliary agent; the inorganic filler is a combination of white carbon black and Create-E2; and the cross-linking auxiliary agent is a combination of a cross-linking auxiliary agent TAIC-70PD and a cross-linking auxiliary agent HVA-2. The EPDM rubber material disclosed by the invention has the effects of long-time high temperature resistance and high insulation.

The invention relates to a preparation process for preparing high-performance acrylate rubber by low-temperature emulsion polymerization, which belongs to the technical field of acrylate rubber synthesis, and adopts 5-10 DEG C low-temperature polymerization reaction in a ferrous ion-containing redox system to reduce the activation energy of free radicals, thereby realizing low-temperature initiated polymerization. A chain transfer reaction in a free radical polymerization process can be remarkably inhibited in a low-temperature polymerization environment, the branched chain content in a polymer molecular chain is reduced, and the gel content of a high-performance acrylate rubber product is further reduced; meanwhile, a trace amount of bifunctional acrylate chain extenders with reactive end groups are added in the polymerization process, so that the molecular weight of a main chain is increased in the free radical polymerization process, a stable crosslinking site is provided by matching with a crosslinking point monomer, the Mooney viscosity of the rubber is improved, and finally, the acrylate rubber with high Mooney viscosity and low gel content is prepared; the gel has excellent mechanical strength, and successfully solves the contradiction that the Mooney viscosity of the gel must be reduced in the prior art.

This invention belongs to the field of synthetic rubber preparation technology, specifically relating to low Mooney viscosity atactic 1,2-polybutadiene, its preparation method, and its applications. The preparation method of the low Mooney viscosity atactic 1,2-polybutadiene includes the following steps: under a protective gas atmosphere, adding a phosphate ester compound to a molybdenum compound, aging and cooling, then adding toluene to obtain a main catalyst; placing a trialkylaluminum alkane solution in an ice-water bath, adding aryloxy ligands dropwise to the container, and reacting in an ice-water bath to obtain a co-catalyst; dissolving butadiene in an alkane solution, adding the co-catalyst, main catalyst, activator, and molecular weight regulator respectively, and carrying out a polymerization reaction to obtain low Mooney viscosity atactic 1,2-polybutadiene. This invention provides a method for preparing low Mooney viscosity atactic 1,2-polybutadiene with high conversion rate; the obtained 1,2-PB has a low Mooney value and a high 1,2-structure content; it can be applied to rubber additives and damping materials to improve their performance.

The present application relates to the field of elastomer material, in particular to a kind of preparation thermoplastic elastomer composition and thermoplastic elastomer and its preparation method and application.The composition includes: ternary ethylene-propylene rubber 100 parts by weight, natural rubber 10-100 parts by weight, polypropylene 40-200 parts by weight, vulcanizing agent 1-10 parts by weight and antioxidant 0.1-5 parts by weight, wherein the Mooney viscosity of the natural rubber is 30-120.The thermoplastic elastomer prepared by the composition of the present application has good wear resistance and mechanical properties, low cost and easy processing.

A rubber composition for a power-transmission belt includes: a polymer component including an ethylene-α-olefin elastomer; carbon black; and clay, in which the ethylene-α-olefin elastomer has a Mooney viscosity at 125° C. of 25 ML (1+4) 125° C. or less, the clay has a pH of 5.5 or higher, a total amount of the carbon black and the clay is 80 parts by mass to 180 parts by mass with respect to 100 parts by mass of the polymer component, and a mass ratio of the carbon black to the clay is clay / carbon black=0.2 / 1 to 1.2 / 1.

To obtain desirable rheological properties (e.g., Mooney viscosity).SOLUTION: A polymeric composition comprising a plurality of hydrocarbyloxysilyl terminated polydienes or polydiene copolymers, wherein the polymeric composition has an aged Mooney (ML1 + 4 at 100 °C) of from about 40 to about 105, wherein the polymeric composition comprises from about 10 to about 95 mole% of said hydrocarbyloxysilyl terminated polydienes or polydiene copolymers, wherein said hydrocarbyloxysilyl terminated polydienes or polydiene copolymers are formed by reacting a reactive polydiene or polydiene copolymer with a dihydrocarbyloxysilyl endblocker.SELECTED DRAWING: None

To provide a thermoplastic vulcanizate (TPV) composition containing a metallocene-based multimodal copolymer rubber.SOLUTION: The TPV composition comprises (a) ethylene-derived unit, from greater than 50 wt.% to less than 100 wt.% of a major polymer fraction having Mooney viscosities from about 15ML (1 + 4 @ 125 °C) to about 120ML (1 + 4 @ 125 °C), from greater than 0 wt.% to less than 50 wt.% of a minor polymer fraction having Mooney viscosities from about 120ML (1 + 4 @ 125 °C) to about 1500ML (1 + 4 @ 125 °C), average molecular weight distributions (Mw / Mn) from about 2.0 to about 4.5, an average branching index from about 0.7 to about 1.0; And less than 10 parts by weight of oil per 100 parts by weight of the multimodal copolymer rubber; (b) at least one other oil; (c) at least one thermoplastic polymer; and (d) a cure system comprising at least one cure material and at least one curative.SELECTED DRAWING: None

The utility model relates to the field of doorney viscosity appearance technology especially, and it is a kind of quick heat conduction doorney viscosity appearance.The quick heat conduction doorney viscosity appearance includes doorney viscosity appearance body, upper die assembly and lower die assembly, the upper die assembly and lower die assembly are both included two and set in doorney viscosity appearance body, the upper die assembly and lower die assembly center symmetry, and the doorney viscosity appearance body is equipped with the support component of the installation of upper die assembly and lower die assembly;The support component is equipped with two groups and in the internal center symmetry of doorney viscosity appearance body.The quick heat conduction doorney viscosity appearance provided by the utility model can drive rotation to upper die assembly and lower die assembly, moves the upper die assembly and lower die assembly of next group to relative part, so new principle can be tested, and then the time of the device in raw material replacement installation can be reduced, so the portability and work efficiency of the device later operation can be improved.

This invention discloses a method for preparing high oil-resistant nitrile rubber. Based on 100 parts by weight of butadiene and acrylonitrile, the mixture includes 275 parts soft water, 50-55 parts butadiene, and 45-50 parts acrylonitrile. The emulsifier is a composite system of dodecylbenzene sulfonic acid and naphthalene sulfonic acid formaldehyde condensate sodium salt, with an emulsifier dosage of 2.5-5 parts. The initiator is a persulfate, with a dosage of 0.1-0.5 parts. Triethanolamine is 0.1 parts. A nitrile rubber paste is synthesized via a thermal polymerization process using a batch feeding method with the addition of a molecular weight regulator. A terminator and antioxidant are added, and the paste is then degassed, coagulated, washed, and dried to obtain a high-strength nitrile rubber product. This nitrile rubber exhibits a Mooney viscosity (ML). (1+4) 100℃ With a strength of 90-120, tensile strength ≥27.5MPa, and elongation at break ≥450%, it can meet the application requirements of automobiles, aerospace, gaskets and other fields.

The invention relates to a waste rubber recovery method and high-strength reclaimed rubber. The waste rubber recovery method comprises the following steps: (1) pre-desulfurizing waste rubber powder to obtain pre-desulfurized rubber powder; and (2) mixing the pre-desulfurized rubber powder obtained in the step (1) with unvulcanized waste rubber, and carrying out deep desulfurization to obtain the high-strength reclaimed rubber. The waste rubber recovery method is simple in process and high in practicability, waste semi-steel tire rubber and scrapped unvulcanized rubber can be recycled at the same time, the production cost is low, and the obtained high-strength reclaimed rubber has excellent tensile strength and also has good elongation and proper Mooney viscosity.

This invention provides a bio-based rubber dispersant and its application in rubber compositions, belonging to the technical field of rubber dispersants. It comprises the following raw materials in parts by weight: 18-26 parts of low molecular weight carboxyl-modified lignin, 3-6 parts of N-cocoyl-1,3-propylenediamine, 40-52 parts of pentaerythritol stearate, and 24-34 parts of plasticizer. This invention can reduce the Mooney viscosity of rubber compositions, improve scorch safety, improve the dispersibility of silica, and enhance the overall mechanical properties of vulcanized rubber.

This fluororubber tackiness agent composition is obtained by blending an acrylic tackiness agent containing an acrylic copolymer having a glass transition temperature Tg of 20°C or lower into a modified fluororubber that has a Mooney viscosity ML1+10 (121°C) of 10-80 and that has an unsaturated bond or includes a functional group and an unsaturated bond. The acrylic tackiness agent is used at a proportion of 10-400 parts by weight with respect to 100 parts by weight of the modified fluororubber. The fluororubber tackiness agent composition exhibits excellent adhesiveness and tackiness without making any compromise to heat resistance, chemical resistance, weather resistance, flame retardancy, etc., inherent to fluororubbers.

The invention discloses a multi-target cooperative control method and system for intelligent production scheduling in the rubber industry, and relates to the technical field of intelligent manufacturing. Comprising the steps that S1, rubber production workshop data are collected in real time, and the data comprise production order information, equipment operation states, material inventory information and rubber material dynamic process parameters; the rubber dynamic process parameters comprise rubber scorching time, vulcanization characteristics, Mooney viscosity attenuation rate and vulcanization window range. According to the method, the production order information, the equipment operation state, the material inventory information and the rubber material dynamic process parameters of the rubber production workshop are collected in real time, and the dynamic process constraint model capable of predicting the change of the rubber material performance along with time is constructed based on the rubber material dynamic process parameters; setting a multi-objective optimization function which takes order delay, equipment utilization rate and sizing material rejection rate as optimization objectives in combination with multiple types of data to generate a preliminary schedule;

This invention provides highly solvent-resistant organic particles using polymers with a cis-1,4-polyisoprene core, such as natural rubber. [Solution] A method for producing organic particles comprising the steps of: dissolving a polymer having cis-1,4-polyisoprene as the main skeleton in a solvent and carrying out a cyclization reaction to obtain a cyclized rubber with a cyclization rate of 60-90%; and suspend polymerization of the cyclized rubber and a vinyl monomer in the presence of water and a suspension stabilizer, wherein the Mooney viscosity [ML(1+4)100℃] of the polymer having cis-1,4-polyisoprene as the main skeleton is 18-65 as defined in JIS K 6300, and the vinyl monomer includes a monofunctional vinyl monomer having only one vinyl group and a crosslinkable vinyl monomer having multiple vinyl groups.

The application relates to the technical field of aerospace new materials, and discloses a novel high-temperature-resistant heat protection silicone rubber material which is composed of a base glue, a vulcanizing agent and a high-temperature-resistant additive in a mass ratio of 100:5:1; the performance indexes of the silicone rubber material satisfy the following conditions: a high-temperature-resistant temperature > 300 DEG C, an elongation at break > 350%, a Shore hardness (A type) of 55-65, no corrosion of a metal matrix under high temperature and no volatile pollutants, the base glue is a Dow Corning methyl vinyl silicone rubber, is selected from one of Dow Corning 184, 732 or 944 models, the vinyl content of which is 0.1%-0.3%, and the Mooney viscosity (ML1+4, 100 DEG C) is 40-60 MU. The novel high-temperature-resistant heat protection silicone rubber material is superior to existing adhesive tapes and domestic similar trial products in core performances such as high-temperature resistance, elasticity, erosion resistance and metal compatibility, and can still maintain structural stability under a 350 DEG C high-temperature environment, is free of corrosion and volatilization.

The invention provides a general type TBR steel wire adhesive formula and a preparation method, and relates to the technical field of tire rubber materials. According to the formula, a pyrolysis carbon black and furnace black synergetic reinforcing and nickel boroacylate long-acting bonding system is adopted, and a three-step feeding and banburying process is matched, so that synergetic optimization of the hardness, the bonding performance and the processing efficiency of the rubber material is realized. A core formula comprises 100 parts of natural rubber, 26 parts of reclaimed rubber, 36 parts of N375 carbon black, 34 parts of cracked carbon black, 0.9 part of nickel boroacylate, a composite vulcanization system and the like, and according to the preparation method, the carbon black and a vulcanization auxiliary agent are added in stages, the internal mixing temperature and time are controlled, and it is ensured that materials are evenly dispersed. The bonding tension of the finished rubber material and a steel wire cord is stabilized at 600-700N, the rubber adhesion rate is 100%, the Mooney viscosity at 100 DEG C meets the industrial production requirement, the heat generation of the rubber material is reduced by more than 30% compared with that of a traditional formula, the high-speed and durability of a tire are remarkably improved, and the rubber material is suitable for key parts such as a belted layer of an all-steel radial tire and is high in universality and cost performance.

An embodiment of the present invention relates to a bonded object or a method for manufacturing a bonded object, the bonded object having bases bonded therein while placing an adhesive layer in between, the adhesive layer being obtained from a fluororubber composition that contains at least one fluororubber selected from fluoroelastomer (FKM) and perfluoroelastomer (FFKM), and has a Mooney viscosity (ML 1+10) at 121° C., measured in accordance with ASTM D1646, of 80 to 115.

The present invention provides a modified conjugated diene polymer which satisfies the following lt; condition (i) gt; -lt; condition (vi) gt; . Lt; condition (i) gt; and the Mooney viscosity measured at 100 DEG C is from 100 to 180 (inclusive). Lt; condition (ii) gt; and the Mooney stress relaxation rate measured at 100 DEG C is in the range of 0.10-0.40. Lt; condition (iii) gt; and the glass transition temperature is-95 DEG C to-45 DEG C. Lt; condition (iv) gt; the content of silicon atoms is 100 ppm by mass or more with respect to the total amount of the modified conjugated diene polymer. Lt; condition (V) gt; the content of nitrogen atoms is 50 ppm by mass or more with respect to the total amount of the modified conjugated diene polymer. Lt; condition (VI) gt; the content of the antioxidant is 0.5 parts by mass or less with respect to 100 parts by mass of the modified conjugated diene polymer.

This invention belongs to the technical field of automotive sealing rubber materials, specifically relating to a micro-foamed solid rubber and automotive sealing strips. The micro-foamed solid rubber uses two types of EPDM rubber with specific Mooney viscosity, ethylene content, and ENB content as the raw rubber system, combined with a microporous foaming system containing a thermally expanding microsphere foaming agent, and an optimized filling, softening, and vulcanization system. Through the synergy of the above formulation and preparation process, the rubber compound forms a uniform microporous closed-cell structure during vulcanization. The resulting micro-foamed solid rubber significantly reduces density, achieves lightweighting, and reduces material consumption while maintaining good mechanical strength and excellent dimensional stability, and is not easily shrunk or deformed after molding. The resulting automotive sealing strips can balance the advantages of low density and cost reduction with the requirements of high structural strength and high assembly precision, making them particularly suitable for sealing applications in automotive doors and other parts.

The invention discloses a plant-based plasticizer as well as a continuous flow process production method and application thereof. When the plant-based plasticizer provided by the invention is used as a rubber composition plasticizer, the Mooney viscosity of a rubber composition can be remarkably reduced, the processability is improved, and the scorching time, the vulcanization efficiency and the strength of the rubber composition can be remarkably improved. Meanwhile, the modified plant-based plasticizer is prepared by adopting a continuous flow process, so that the production safety can be remarkably improved, the efficiency of epoxidation reaction and the consistency of products can be improved, and the method is suitable for large-scale production.

The invention discloses a method for prolonging the scorching time of natural rubber, and relates to the technical field of rubber mixing processing.The method for prolonging the scorching time of the natural rubber comprises the following steps that firstly, raw materials are prepared, natural rubber fresh latex with the Mooney viscosity being 60-80 is selected as a raw material, meanwhile, purity detection is conducted on a lanthanum chloride reagent, and the purity of the lanthanum chloride reagent is detected; removing impurities through a 100-mesh sieve; 2, lanthanum chloride pretreatment: dissolving lanthanum chloride in deionized water according to the dosage of 0.1-0.7 phr (based on per 100 parts of dry glue) to prepare an aqueous solution; 3, fresh latex dilution: diluting the natural rubber fresh latex with deionized water until the solid content is 18%-28%, uniformly stirring, and standing for 30 minutes; step 4, latex stabilization treatment: adding potassium laurate into the diluted latex, and stirring for 30-60 minutes; the invention discloses a method for prolonging the scorching time of natural rubber.

The application discloses a polypropylene composite material and a preparation method and application thereof, and relates to the technical field of polymer materials.The polypropylene composite material comprises the following components in parts by weight: 70-110 parts of polypropylene resin, 1-5 parts of POE elastomer, 3-8 parts of EMA, and 0.2-0.5 parts of lubricant; wherein, the POE elastomer has a Mooney viscosity of 6-15, and the Mooney viscosity is measured at a temperature of 121 DEG C; and the EMA has an acrylate content of 11-26%. Through the cooperation of the POE elastomer, the EMA and the lubricant, the microstructure is optimized, and the mechanical properties and welding properties of the polypropylene composite material are improved.

The present application relates to a kind of preparation methods of high oil-resistant nitrile rubber, and polymerization at least includes the following process: butadiene, acrylonitrile, water, composite emulsifying system, partial molecular weight regulator, initiator are added to polymerization kettle, using the intermittent feeding mode of batch supplementing molecular weight regulator, heat method polymerization process is synthesized butyronitrile glue pulp, termination agent and antioxidant are added, and it is after degassing, coagulation, washing and drying to obtain a kind of high-strength butyronitrile rubber product.The butyronitrile rubber has the tensile strength of Mooney viscosity ≥27.5MPa, and can meet the application requirements of automobile, aerospace, sealing washer and other fields.

The utility model discloses a transparent laminated body. The transparent laminated body comprises a first base material layer, a second base material layer and a middle adhesive layer, the second base material layer is arranged on one side of the first base material layer; the middle adhesive layer is arranged between the first base material layer and the second base material layer; the middle adhesive layer at least comprises a pattern layer, the pattern layer comprises a pattern area and a non-pattern area, and the Mooney viscosity of the pattern area is larger than that of the non-pattern area. The utility model further discloses an atmosphere lamp assembly. The utility model further discloses a vehicle. The transparent laminated body is good in invisible effect in the vertical direction of the transparent laminated body under the condition of no light source irradiation, clear patterns can be formed under the condition of light source irradiation, and a good display effect is achieved.

To provide a conjugated diene-based polymer which gives a rubber composition having an excellent balance between gripping properties and abrasion resistance and excellent silica dispersibility and has a low water content.SOLUTION: Wherein a content of an aromatic vinyl monomer unit is 30 mass% or more and 45 mass% or less, an amount of 1, 2-vinyl bonds is 30mol% or more and 60mol or less, a mooney viscosity is 30 or more and 90 or less, a molecular weight distribution obtained by GPC (gel permeation chromatography) is 1.7 or more and less than 3.0, a content of a conjugated diene-based polymer having a molecular weight of 100,000 or less is 5 mass% or more, a content of a conjugated diene-based polymer having a molecular weight of 1,000,000 or more is 5 mass% or more, and a content of Mg is 10ppm or more.SELECTED DRAWING: None