234 results about "Mooney viscosity" patented technology

The invention belongs to the technical field of rubber, and discloses bio-based reinforced resin, a preparation method, a rubber composition and application. The bio-based reinforced resin is prepared from lignin, cashew nut shell oil, rosin or derivatives thereof and a vegetable fat modifier, the biochar content is up to 100%, the Mooney viscosity and MH of a sizing material are obviously reduced, and the bio-based reinforced resin has the advantages of long scorching time and high vulcanization speed in the sizing material application process.

The invention belongs to the technical field of sealing materials and synthetic rubber, and particularly discloses a high and low temperature resistant, wear resistant and fatigue resistant ethylene propylene rubber material and a preparation method thereof. According to the invention, the ethylene propylene rubber with low ethylene content and high Mooney viscosity is used as a base material, and the flexing resistance of a rubber system is improved by adding the small-particle-size high-wear-resistance carbon black, the high-structure-degree fast extruding carbon black, the compounded semi-reinforcing carbon black and the white carbon black as reinforcing filling materials. The low temperature resistance of the rubber is improved by adding a composite plasticizer (paraffin oil is compounded with a small amount of fatty acid ester plasticizer). Meanwhile, peroxide is selected, and a small amount of sulfur is used as a vulcanization system, so that the flexing resistance can be considered while the high-temperature resistance is ensured. And finally, the anti-aging agent is supplemented to enhance the protection effect on aging caused by heat and oxygen, so that the heat resistance and fatigue resistance of the rubber material are integrally improved. The rubber material provided by the invention can be prepared by adopting a universal mixing process in the rubber industry, and is simple in process and convenient to operate.

To provide a method for producing a composite for a secondary battery electrode having excellent electrical conductivity by precisely controlling the dispersion state of fibrous carbon on an active material.SOLUTION: A method for producing a composite for a secondary battery electrode containing an electrode active material and fibrous carbon includes a step of combining an electrode active material and a fibrous carbon dispersion in which the fibrous carbon is dispersed in a solvent in a non-slurry state by using a mechanochemical mixer, and a step of removing the solvent and drying the composite. The fibrous carbon dispersion contains fibrous carbon, a dispersant, and a solvent. The dispersant contains a copolymer A containing a nitrile-group-containing structural unit and an aliphatic hydrocarbon structural unit. The Mooney viscosity (ML1+4,100°C) of the copolymer A is 10 to 70, and the phase angle of the fibrous carbon dispersion at a frequency of 1 Hz measured by dynamic viscoelasticity measurement is 19° or more.SELECTED DRAWING: None

The invention discloses a preparation method of nitrile rubber with improved thermo-oxidative aging resistance, which comprises the following steps: butadiene and acrylonitrile are used as main polymerization monomers, and a reactive anti-aging agent with an amide group is used as a functional monomer; the total addition amount of butadiene and acrylonitrile is 100 parts by mass, and acrylonitrile is added in batches or continuously, preferably more than three times; a low-temperature emulsion polymerization method is adopted, and the compound emulsifier at least contains disproportionated rosin soap, C10-C13 linear alkyl benzene sulfonic acid and naphthalene sulfonic acid formaldehyde condensate sodium salt; the preparation method comprises the following steps of: adding a molecular weight regulator into a compound emulsifier, preferably 3.2-6.5 parts by weight, more preferably 3.8-6.0 parts by weight of the compound emulsifier, adding the molecular weight regulator once or multiple times, synthesizing butyronitrile rubber cement, adding a terminating agent, degassing, condensing, washing and drying to obtain the butyronitrile rubber. According to the invention, the nitrile rubber with good thermo-oxidative aging resistance is produced, wherein the content of bound acrylonitrile is 17-20%, and the binding amount of Mooney viscosity # imgabs0 # reactive anti-aging agent is 1-2%.

The invention discloses a preparation method of high-oil-resistance nitrile rubber, which comprises the following components in parts by weight: 275 parts of soft water, 50-55 parts of butadiene and 45-50 parts of acrylonitrile, wherein the addition amount of butadiene and acrylonitrile is 100 parts; the emulsifier is a dodecylbenzene sulfonic acid and naphthalene sulfonic acid formaldehyde condensate sodium salt composite system, and the dosage of the emulsifier is 2.5-5 parts; the initiator adopts persulfate, and the use amount of the initiator is 0.1-0.5 part; 0.1 part of triethanolamine; the preparation method comprises the following steps: synthesizing butyronitrile rubber cement by adopting an intermittent feeding mode of replenishing a molecular weight regulator in batches and a thermal polymerization process, adding a terminating agent and an anti-aging agent, and degassing, condensing, washing and drying to obtain a high-strength butyronitrile rubber product. The nitrile rubber has the Mooney viscosity ML (1 + 4) 100 DEG C of 90-120, the tensile strength of more than or equal to 27.5 MPa and the elongation at break of more than or equal to 450%, and can meet the application requirements in the fields of automobiles, aerospace, sealing washers and the like.

A green and sustainable tire base rubber composition and a preparation method, relating to the technical field of tire production. The composition comprises a tire base. The tire base comprises 100 parts by weight of cis-1,4-polyisoprene, 20-40 parts by weight of bio-based carbon black, 0-20 parts by weight of bio-based silicon, 0-20 parts by weight of a silane coupling agent, 1-3 parts by weight of stearic acid, 2-7 parts by weight of zinc oxide, 0.5-2 parts by weight of a carbon black coupling agent, 1.5-3.5 parts by weight of the antioxidant 6PPD, 0.5-2 parts by weight of the antioxidant TMQ, 1.5-2 parts by weight of oil-extended sulfur powder, and 1.5-3.0 parts by weight of the accelerator CZ. The use of the carbon black coupling agent reduces the heat build-up of a rubber material, however, the Mooney viscosity of the rubber is significantly increased. Once a dedicated process has been used, the viscosity of the rubber material is controlled, and the tanδ value of the heat build-up of the rubber material at 60°C is significantly reduced, so that the rolling resistance of a tire is reduced, and the tire maintains good physical and mechanical properties.

The present invention relates to a composite solid electrolyte including sulfide-based solid electrolyte particles, and a polymer coating layer formed on the sulfide-based solid electrolyte particles, wherein the polymer coating layer includes a polymer having a Mooney viscosity (ML1+4, 100 °C) of 30 to 110, and an all-solid-state battery including the composite solid electrolyte.

The utility model discloses a carcass composite piece for improving exposed lines in a tire, which comprises an airtight layer, a transition layer, a carcass, a carcass rubber sheet, a tire shoulder pad rubber, a tire crown, a tire sidewall and a carcass body rubber, the transition layer is paved on the airtight layer, the carcass is paved on the transition layer, the tire shoulder pad rubber is paved on the carcass and is positioned on the shoulder part of the tire, and the tire crown is paved on the tire shoulder pad rubber. The tire shoulder pad rubber is laid at the joint of the tire body and the tire shoulder pad rubber, the tire body rubber is arranged at the joint of the transition layer and the tire body and located at the tire shoulder, and the tire body rubber sheet is laid at the joint of the tire body and the tire shoulder pad rubber and located at the tire shoulder. The problems that gaps between tire body cord threads are increased, cord thread rubber materials are insufficient, and butyl rubber permeates into an air tight layer due to inflation shaping expansion are effectively solved, and when existing equipment is free of space transformation or capital is insufficient, the problem that threads are exposed in a tire due to the fact that the size and quality of half parts fluctuate, the Mooney viscosity of a transition layer is too low, and the assumed stretching value of the tire body cord threads is too large is effectively solved.

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.

The invention discloses high-temperature-resistant silicone rubber and a preparation method thereof, and belongs to the field of polymer compositions. The silicone rubber is composed of vinyl-terminated polydimethylsiloxane, fumed silica, hydroxyl silicone oil, a hydrogen-containing silicone oil cross-linking agent, a platinum catalyst, an inhibitor methyl butynol, cerium oxide and zinc oxide whiskers. During preparation, vinyl siloxane and 1 / 2 of white carbon black are subjected to vacuum banburying for 40 min at the temperature of 155 DEG C, the remaining white carbon black and hydroxyl silicone oil are added to be mixed for 50 min at the temperature of 125 DEG C, other components are sequentially added after cooling, and vulcanization is conducted at the temperature of 170 DEG C * 15 MPa. The shore A hardness of the obtained silicone rubber is greater than or equal to 63, the retention rate of elongation at break is greater than or equal to 485%, the retention rate of tensile strength after aging at 350 DEG C for 72 hours is greater than or equal to 86%, the thermal weight loss is 5%, the temperature is greater than or equal to 476 DEG C, the Mooney viscosity is less than or equal to 47, and the silicone rubber has excellent processability and high-temperature stability.

The present invention relates to a conjugated diene polymer, a method for producing a conjugated diene polymer, a conjugated diene polymer composition, and a rubber composition. The purpose of the present invention is to provide a conjugated diene polymer which has extremely excellent processability when made into a sulfide, and which has excellent wear resistance, handling stability, and breaking strength after being made into a sulfide. A conjugated diene-based polymer which is a copolymer of a conjugated diene compound and an aromatic vinyl compound, and which has a Mooney viscosity measured at 100 DEG C of 40-170, a Mooney stress relaxation rate measured at 100 DEG C of 0.239-0.35, and a branching degree (Bn) of 8 or more as determined by a GPC-light scattering measurement method with a viscosity detector, and which contains a nitrogen atom.

The invention discloses a high-strength insulating hyperbranched polyethylene elastomer material and a preparation method thereof. The high-strength insulating hyperbranched polyethylene elastomer material comprises the following raw material components: 95-100 parts of a hyperbranched polyethylene elastomer, 0.5-1.5 parts of a covalent triazine framework and 3-5 parts of an anti-aging agent, the branching degree of the hyperbranched polyethylene is 50-130 branched chains per 1000 carbons, the weight-average molecular weight is 660,000-534,000, and the Mooney viscosity ML (1 + 4) 125 DEG C is 66-78. The mechanical strength of the hyperbranched polyethylene elastomer added with the covalent triazine framework as the reinforcing agent is remarkably improved, and the insulating property of the hyperbranched polyethylene elastomer can be maintained at the original level.

The present invention pertains to a rubber composition for a transmission belt, the rubber composition comprising: a polymer component including an ethylene-α-olefin elastomer; carbon black; and clay. The Mooney viscosity of the ethylene-α-olefin elastomer at 125° C. is 25 ML(1+4)@125° C. or less, and the pH of the clay is 5.5 or higher. The total amount of the carbon black and the clay is 80-180 parts by mass per 100 parts by mass of the polymer component, and the mass ratio of the clay to the carbon black is clay / carbon black=0.2 / 1 to 1.2 / 1.

The invention relates to the technical field of underground cables, and provides a wear-resistant cable for a shield tunneling machine and a preparation method of the wear-resistant cable. The wear-resistant cable for the shield tunneling machine comprises a conductor, an insulating layer, an armor layer and a sheath layer which are sequentially arranged from inside to outside, and the sheath layer is prepared from the following raw materials in parts by weight: 90-100 parts of polyvinyl chloride, 8-14 parts of chlorinated polyethylene, 8-10 parts of a plasticizer, 9-16 parts of filler, 1-4 parts of a stabilizer, 1-2 parts of an antioxidant, 1-3 parts of a lubricant, 1-3 parts of a compatilizer and 1-2 parts of a vulcanizing agent; the chlorinated polyethylene comprises first chlorinated polyethylene and second chlorinated polyethylene; the Mooney viscosity of the first chlorinated polyethylene is 40-60 under the conditions of ML1 + 4 and 121 DEG C; and the Mooney viscosity of the second chlorinated polyethylene is 70-90 under the conditions of ML1 + 4 and 121 DEG C. According to the technical scheme, the problem of poor impact strength of the wear-resistant cable for the shield tunneling machine in the prior art is solved.

The invention provides a color mixing technology of colored rubber, which comprises the following steps: step S1, plasticizing natural rubber: plasticizing natural rubber raw materials in an internal mixer at 60-80 DEG C for 10-20 minutes, so that the Mooney viscosity of the natural rubber raw materials is reduced to 40-60; step S2, mixing and color mixing: quantitative color masterbatch is added into the plasticized natural rubber, the color masterbatch is selected from an organic pigment, an inorganic pigment or a mixture of the organic pigment and the inorganic pigment, and the adding amount of the color masterbatch is 0.3%-3% of the weight of the natural rubber; s3, composite foam molding: continuously compounding the natural rubber subjected to color mixing and a polyurethane coiled material in a double-screw extruder, and carrying out foam molding at 120-140 DEG C under the pressure of 8-12 MPa to form a double-sided different-color structure; s4, blanking and packaging: carrying out die cutting and blanking on the foamed and molded composite coiled material to prepare a yoga mat finished product with a specified size; according to the invention, a preset amount of color masterbatch can be added in a natural rubber mixing link, so that the natural rubber is colored rubber with a specified color after subsequent foaming molding.

The present invention discloses a method and system for predicting the tensile strength of natural rubber, which belongs to the field of data prediction technology. The method comprises: obtaining raw rubber to be tested; wherein the raw rubber to be tested is prepared from fresh latex of a rubber tree; obtaining measurement data of the raw rubber to be tested; wherein the measurement data of the raw rubber to be tested include initial plasticity value, plasticity retention rate, Mooney viscosity, nitrogen content, acetone soluble matter content, copper ion content and manganese ion content; inputting the measurement data of the raw rubber to be tested into a prediction model, and outputting the predicted tensile strength of the vulcanized rubber of the raw rubber to be tested. The testing method of the present application does not require a variety of special equipment and instruments, and solves the problems of the original testing process having multiple processes, multiple equipment, long time consumption, high cost, environmental pollution and the need for support from professional and technical personnel. The present application can simply, quickly and effectively obtain the tensile strength index value that characterizes the mechanical properties of natural rubber through seven quality indicators of raw rubber such as initial plasticity value.

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 relates to liquid hydrogenated butadiene-acrylonitrile rubber and a preparation method thereof, and relates to the technical field of rubber materials, and the physicochemical property parameters of the liquid hydrogenated butadiene-acrylonitrile rubber are as follows: the weight-average molecular weight is 10000-300000, the molecular weight distribution index is 1.5-6.0, the weight percentage content of acrylonitrile is 15%-50%, and the Mooney viscosity is 10-60. The lithium-electrode liquid hydrogenated nitrile rubber provided by the invention has the characteristics of relatively low molecular weight, relatively narrow molecular weight distribution and the like, has relatively good compatibility with other high polymer materials, well disperses multi-walled carbon nanotubes, well reduces the viscosity of positive electrode slurry, increases the content of a conductive material in lithium ion battery slurry, and improves the conductivity of the lithium ion battery slurry. The excellent conductivity of the conductive agent is ensured, and the cycle performance of the battery is improved; the preparation method provided by the invention is simple and feasible in process, and solves the problem that the molecular weight and molecular weight distribution are difficult to control in the prior art.

The present invention provides organic particles with high solvent resistance, which are made from a polymer having a main skeleton of cis-1,4-polyisoprene, a typical example of which is natural rubber. [Solution] A method for producing organic particles includes the steps of dissolving a polymer having cis-1,4-polyisoprene as a main skeleton in a solvent and carrying out a cyclization reaction to obtain a cyclized rubber having a cyclization rate of 60 to 90%, and suspension polymerizing the cyclized rubber and a vinyl monomer in the presence of water and a suspension stabilizer, wherein the polymer having cis-1,4-polyisoprene as a main skeleton has a Mooney viscosity [ML(1+4)100°C] specified in JIS K 6300 of 18 to 65, and the vinyl monomer contains a monofunctional vinyl monomer having only one vinyl group and a crosslinkable vinyl monomer having multiple vinyl groups.

The present invention discloses a rubber plasticizing machine, comprising a water tank and a tube body, wherein a rotatable main shaft is provided in the tube body; a feed port is provided on the side wall of one end of the tube body, and a discharge port is provided at the other end of the tube body; a feed auger, a discharge disc and a disc cutter are nested on the main shaft; the feed auger and the cutter disc rotate synchronously with the main shaft; a heating plate and a fixed knife block are fixed on the outer wall of the tube body, the heating plate is attached to the outer wall of the tube body, and the fixed guide block extends into the tube body through the outer wall of the tube body. The present invention improves the structure of the existing cold water rubber kneading machine, on the one hand, reducing the slippage phenomenon caused by cold operation, and on the other hand, using circulating cold to balance the hot operation temperature, avoiding the problem of excessive viscosity or even carbonization of the rubber, thereby obtaining better kneading and shearing effects, so that the obtained rubber has better Mooney viscosity and better processing performance.

The present invention is an invention aimed at improving the air stability of conventional sulfide-based solid electrolytes, and includes sulfide-based solid electrolyte particles and a polymer coating layer formed on the sulfide-based solid electrolyte particles. The polymer coating layer contains a composite solid electrolyte containing a polymer having a Mooney viscosity (ML1+4, 100 °C) of 30 or more and 110 or less, and a all-solid-state battery including the same.

Provided are a conjugated diene-based polymer, a conjugated diene-based polymer composition, and a crosslinked product of a conjugated diene-based polymer, etc. that have no problems in practical use with processability and heat resistance and are excellent in compression set and cold resistance. The present invention provides a conjugated diene-based polymer satisfying the following mathematical expression (A): mathematical expression (A): 35 (%)≤100*(b+d) / (a+b+c+d)≤99 (%) wherein constituent molar ratios of respective structure units represented by the following structural formulas (1) to (4) are defined as a, b, c, and d, respectively, having a Mooney viscosity at 100° C. of 25 or more and 125 or less, having a glass transition temperature of −50° C. or less measured by differential scanning calorimetry (DSC), and having a crystallization peak-derived heat of crystallization of 2.5 J / g or more and 50 J / g or less.

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 the technical field of tire manufacturing, in particular to application of micro-nano reclaimed rubber in preparation of solid tire core rubber or solid tire crown rubber. Compared with solid tire crown rubber and solid tire core rubber prepared by using a traditional tire reclaimed rubber technology, the micro-nano reclaimed rubber is introduced into the solid tire crown rubber or solid tire core rubber formula, so that the Mooney viscosity of the solid tire crown rubber and the solid tire core rubber is remarkably reduced; meanwhile, the energy consumption caused by the use of TRR in the preparation process is also effectively reduced, the environmental pollution is greatly reduced, and particularly, the generation of wastewater is remarkably reduced.

This conjugated diene-based polymer comprises a structural unit derived from a conjugated diene-based compound, wherein: the content of a structural unit derived from an aromatic vinyl compound is 7% by mass or less; the 1,2-vinyl bond amount in the structural unit derived from the conjugated diene-based compound is 8-22 mol%; the modification rate is 30%-99%; the Mooney viscosity at 100°C is 25-130; the Mooney stress relaxation at 100°C is 0.30-0.85; and the total content of silicon and tin is 50 ppm or less.

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.