1450 results about "Diene" patented technology

The invention relates to a rubber blend, to a sulfur-crosslinkable rubber mixture comprising the rubber blend and to a vehicle tire comprising such a rubber mixture.The rubber blend comprisesat least one solution-polymerized diene polymer A of high molecular weight andat least one solution-polymerized polymer B of low molecular weight,wherein at least one of polymers A and B has been functionalized at the chain end and / or along the polymer chain and / or at a coupling site with at least one group selected from epoxy groups, hydroxyl groups, carboxyl groups, silane sulfide groups, amino groups, siloxane groups, organosilicon groups, phthalocyanine groups and amino group-containing alkoxysilyl groups.

The invention discloses a single-phase refrigerant medium and a preparation method thereof.The preparation method comprises the following preparation steps that S1, in an inert gas atmosphere, a dimethyl cyclosiloxane mixed ring body and 1, 1, 3, 3-tetramethyldisiloxane react under the action of a second catalyst, and after impurities are removed, a hydrogen-terminated polysiloxane intermediate is obtained; s2, in an inert gas atmosphere, adding the end hydrogen-containing polysiloxane intermediate and a first catalyst into a solvent, then adding isolated diene for reaction, adding alpha-olefin after the reaction is performed for a period of time, and performing low-temperature removal to obtain the single-phase refrigerant medium. The single-phase refrigerant medium has the advantages of being good in fluidity, resistant to high and low temperature, good in insulativity, good in thermal conductivity, high in safe usability and the like, does not contain fluorocarbon compounds, is environmentally friendly, is simple in preparation method and is suitable for industrial production.

The invention relates to the technical field of building construction, and discloses an outer wall facade deformation joint hidden type curtain wall sealing structure and a construction method. Comprising positioning parts which are fixedly arranged on the two sides of a deformation joint; ePDM (ethylene-propylene-diene monomer) telescopic rubber strips are arranged between the two positioning components. The EPDM telescopic adhesive tape can completely cover the deformation joint; the EPDM telescopic adhesive tape, the chemical bolt, the keel and the aluminum plate are fixed to the deformation joint, the deformation joint cover plate and the deformation joint cover plate lock catch are arranged to hide the deformation joint, and therefore the appearance effect is achieved, meanwhile, the problems of cracks, damage and the like of a building in the later period are avoided, the service life of the building is prolonged, water seepage is reduced, and the construction quality is improved. Attractiveness is improved, and later maintenance cost is saved to a certain extent; the structure can avoid the influence of expansion and contraction of materials, release of structural stress and earthquake deformation on the structure, does not influence the appearance effect of the building, and is suitable for industrial and civil building facade deformation joint construction.

A rubber coating for a radiofrequency identification device for a tyre characterized in that it comprises: (a) 100 phr of at least one diene-based elastomer; (b) at least one chemical according to formula (1) wherein the chemical comprises in its structure at least the structure of the 2,2′-methylenediphenol, and wherein the 2,2′-methylenediphenol may be substituted in ortho, para, meta position or any combination thereof with an aliphatic, linear or branched, hydrocarbon chain comprising from 1 to 10 C atoms, or may be polymerized in ortho, para, meta position or any combination thereof with one or more additional alkylphenol units. A radiofrequency identification (RFID) module for a tyre comprising a radiofrequency identification device surrounded by a rubber coating, a tyre or a tyre retread comprising such radiofrequency identification module, and use of a rubber coating for surrounding a radiofrequency identification device.

An improved Type C air conditioning hose is provided that meets or exceeds SAE J2064 and J3062 requirements, offers good flexibility and fracture resistance, and exhibits improved permeation ratings for refrigerants including R134a and R1234yf. The multilayer type C barrier air conditioning hose includes an inner elastomeric tube layer capable of direct bonding to plastic without an intervening adhesive. The inner elastomeric layer is prepared from a first elastomeric composition comprising a blend of an ethylene propylene diene terpolymer rubber (EPDM) and a chloroprene rubber (CR), phenylenedimaleimide, and a maleated compound.

The present invention relates to an elastomeric laminate comprising at least two adjacent layers, wherein: the rubber composition constituting the first layer is based on 20 phr to 100 phr of at least one copolymer comprising ethylene units and 1,3-diene units of formula CH2=CR-CH=CH2, the ethylene units in the copolymer representing more than 50 mol% of the copolymer monomer units, and the symbol R represents a hydrocarbon chain having 3 to 20 carbon atoms, 0 phr to 80 phr of at least one diene elastomer having a diene unit weight concentration greater than 50%, 10 phr to 100 phr of a plasticizing system comprising at least one plasticizing resin having a glass transition temperature higher than 20°C and / or at least one plasticizer which is liquid at 23°C, and a reinforcing filler, and a crosslinking system; the rubber composition constituting the second layer is based on a diene elastomer having a diene unit weight concentration greater than 50% and a crosslinking system. The present invention also relates to a rubber article, in particular a pneumatic or non-pneumatic tire, comprising such a laminate.

The invention discloses a diene lactone hydrolase mutant and an application thereof. The protein provided by the invention is a diene lactone hydrolase mutant, the 184th amino acid residue on an amino acid sequence shown as SEQ ID NO: 2 is mutated, and the amino acid residues at other positions are not changed, so that the protein with PBAT hydrolase activity is obtained; the PmDLH mutant T184H is obtained by mutating wild type PmDLH by utilizing a structural analysis and site-directed mutagenesis technology, and compared with the wild type PmDLH, the PmDLH mutant T184H has the advantages that the problem of low enzyme activity of the wild type PmDLH is solved, the activity of the PmDLH in degrading polyester plastic PBAT is effectively improved, the degradation effect of the PmDLH is improved, and the industrial application prospect is good.

The invention discloses a compression-resistant and torsion-resistant energy storage cable and a preparation method thereof, and relates to the technical field of energy storage cables. The compression-resistant and torsion-resistant energy storage cable sequentially comprises a cable core, an insulating layer, a lubricating shielding layer and a compression-resistant outer protective layer from inside to outside, wherein the compression-resistant outer protective layer at least comprises the following raw materials in parts by mass: 70-90 parts of high-density polyethylene; 10 to 20 parts of low density polyethylene; 20 to 30 parts of elastic particles; 30 to 40 parts of an ethylene-vinyl acetate copolymer; 30 to 40 parts of a flame retardant; 5 to 10 parts of maleic anhydride grafted poly ethylene propylene diene monomer; 0.1 to 1 part of an antioxidant; 1-2 parts of a lubricant; 0.1 to 1 part of a cross-linking agent; and 0.1-1 part of an assistant cross-linking agent. The anti-compression and anti-torsion energy storage cable prepared by the invention has excellent mechanical performance and electrical performance, and the anti-compression and anti-torsion performance of the energy storage cable is improved.

The present invention discloses a class of imide ring-containing dimercapto monomers, imide ring-containing diene monomers and preparation methods thereof, a light-responsive polyimide material and preparation method thereof, and relates to the technical field of light-driven materials. The present invention uses a dibasic acid anhydride as the basic monomer unit, and prepares a dimercapto monomer containing an imide structure and a monomer containing an imide ring-containing diene monomer by reacting with a monothiol compound and a monoalkyne compound, respectively. The two monomers are subjected to a thiol-alkyne click reaction to finally obtain a high molecular weight polyimide. The polyimide obtained by the present invention has excellent solubility, high tensile strength, good heat resistance and light transmittance; the polyimide material is placed under an ultraviolet lamp for uneven photocrosslinking to quickly obtain a light driver with excellent reversible driving performance.

The disclosure relates to the purification and treatment of oil produced from the liquefaction of waste polymer like for instance the pyrolysis of waste plastics via the polymerization of dienes prior to further treatments.

The disclosure relates to the purification and treatment of oil produced from the liquefaction of waste polymer like for instance the pyrolysis of waste plastics via the polymerization of dienes prior to further treatments.

The invention discloses a rubber composition for tire crown components, specifically related to the field of rubber, including the following raw materials by weight: 100 parts of diene rubber, 0.3-3 parts of hydrazide compounds, 40-160 parts of reinforcing fillers, 0-1.5 parts of low rolling resistance modifiers, 2-18 parts of silane coupling agents, vulcanization accelerators, vulcanizing agents, antioxidants, vulcanization activators, processing aids, resins and plasticizers. Hydrazide compounds can improve the compatibility between rubbers, and after complexing with zinc oxide, stabilize sulfur cross-linking bonds, thereby improving fatigue crack resistance, delaying crack initiation, reducing crack propagation rate, and improving physical property retention after aging. Low rolling resistance modifiers can react with the double bonds of synthetic diene rubbers in a trans-Diels-Alder reaction, which has the effect of reducing rolling resistance. Hydrazide compounds and low rolling resistance modifiers are used together, and the rubber composition has the performance of anti-fatigue, anti-crack growth, anti-collapse and block falling, low hysteresis loss, low heat generation, and low rolling resistance.

The invention discloses a method for extracting a p-phenylenediamine antioxidant in a liquid sample and application of the p-phenylenediamine antioxidant. The p-phenylenediamine antioxidant comprises N-(1, 2, 4-trimethyl-1, 3-pentanediol) the organic solvent is at least one of N, N '-diphenyl-1, 3-dimethyl butyl)-N'-phenyl p-phenylenediamine, N-cyclohexyl-N '-phenyl p-phenylenediamine, N-isopropyl-N'-phenyl-p-phenylenediamine, N, N '-diphenyl-1, 4-phenylenediamine, N, N'-di-2-naphthyl p-phenylenediamine and 2-((4-methylpentane-2-yl) amino)-5-(phenyl amino) cyclohex-2, 5-diene-1, 4-diketone. According to the method, liquid-liquid extraction which is simple and efficient to operate, low in cost and good in repeatability is adopted as a sample pretreatment method, and is combined with an isotope label method and an ultra-high performance liquid chromatography-tandem mass spectrometry technology, so that separation and qualitative and quantitative detection of six p-phenylenediamine antioxidants and quinone derivatives in a sample are realized; meanwhile, the sensitivity is high, the quantity of isotope internal standards is small, the solvent loss is small, and the actual detection requirement is met.

The disclosure relates to the purification and treatment of oil produced from the liquefaction of waste polymer like for instance the pyrolysis of waste plastic via the polymerization of dienes prior to further treatments.

The invention relates to a method for synthesizing tetrasubstituted ‑1,3‑enedicarboxylic acid, and discloses a method for synthesizing tetrasubstituted ‑1,3‑enedicarboxylic acid. The method comprises the following steps: using 1,3‑enyne and iodide as raw materials, potassium formate as a formate source, DABCO as a hydrogen transfer catalyst, Ir(bpy)2(dtbpy)PF6 as a photocatalyst, and cesium carbonate as a base, introducing CO2 under normal pressure, and obtaining an enedicarboxylic acid compound with an excellent to good yield under room temperature and visible light irradiation for 24 hours. The method has mild reaction conditions, good regioselectivity, and good functional group tolerance, and makes up for many deficiencies of the prior art.

The invention relates to the technical field of mercury removal, in particular to a compound heavy metal chelating agent and a preparation method and application thereof. The preparation method of the compound heavy metal chelating agent comprises the following steps: mixing N-dithio carboxyl-amino phenyl formic acid, a cyclohexyl-3, 5-diene-1, 2-dicarboxylic acid solution, a propionic acid solution and a sodium hydroxide solution, stirring until complete dissolution and standing, then completing evaporative crystallization, and separating and purifying the separated chelating agent. The N-dithio carboxyl-amino phenyl formic acid, the cyclohexyl-3, 5-diene-1, 2-dicarboxylic acid, the propionic acid and a proper amount of sodium hydroxide are mixed to form a compound reagent, the chelating absorption effect on the heavy metal Hg in the natural gas wastewater is better, and the formed chelate is very stable and not easy to decompose.

The invention discloses an ablation-resistant EPDM (Ethylene-Propylene-Diene Monomer) thermal insulation material and a preparation method thereof, and belongs to the field of thermal insulation materials, the thermal insulation material is prepared from the following components in parts by mass: 70 to 80 parts of EPDM rubber, 20 to 30 parts of liquid EPDM, 15 to 20 parts of silicon dioxide, 10 to 40 parts of high-temperature-resistant filler, 10 to 15 parts of flame retardant, 10 to 15 parts of heat-resistant fiber and 3 to 5 parts of cross-linking agent. A third monomer of the ethylene propylene diene monomer is ethylidene norbornene, and the ethylene content is 50-60%. The raw materials are placed between double rollers to be mixed, and a mixed sheet is obtained; and performing vulcanization molding on the mixed sheet to obtain the ablation-resistant ethylene-propylene-diene monomer thermal insulation material. The content of the heat-resistant fibers is increased, the aramid fibers are subjected to in-situ carbonization to form a carbonized layer structure frame, and meanwhile, the content of SiO2 is regulated and controlled, so that the content of SiO2 is matched with the increase of the fibers, and the ablation resistance of the thermal insulation material is improved.

The present invention relates to a method of producing a cord for a power transmission belt, the method including: a first treatment step of treating an untreated yarn of a cord for a power transmission belt with a first treatment agent including a resin component (A) to obtain a first treated yarn; and a second treatment step of treating the first treated yarn with a second treatment agent including a condensate (B1) of resorcin and formaldehyde, an unmodified latex (B2), and an acid-modified diene-based polymer (B3) to obtain a second treated yarn.

The invention provides a compression-molded light transparent high-heat wear-resistant rubber and plastic outsole and a preparation method thereof, and the compression-molded light transparent high-heat wear-resistant rubber and plastic outsole is prepared from the following materials in parts by mass: 50-60 parts of high-hardness thermoplastic resin; 10 to 20 parts of polydiene rubber; 20 to 30 parts of mixed polyurethane; 3-5 parts of a heat conduction auxiliary agent; 0.5-1 part of an anti-aging agent; 0.1 to 0.3 part of an ultraviolet absorbent; 0.1 to 0.3 part of a lubricant; and 0.3 to 0.5 part of a cross-linking agent. The limited components are internally mixed by an internal mixer and then are subjected to flat-plate mould pressing vulcanization to obtain the light transparent high-heat wear-resistant rubber and plastic outsole which is formed by mould pressing. According to the light transparent high-heat wear-resistant rubber and plastic outsole, nano spherical aluminum oxide is added as a heat-conducting additive, so that light scattering caused by refractive index difference between filler and a matrix and particle aggregation is effectively reduced, and the original transparent texture of the material is maintained to the greatest extent while the material is endowed with a heat-conducting function; the sole is especially suitable for high-strength sports shoes such as basketballs, racing running shoes and the like which have harsh requirements on sole performance.

The EPDM composition is a rubber composition obtained by blending carbon black, a plasticizer and a cross-linking agent in an ethylene-propylene-diene ternary copolymer rubber, the plasticizer is a polyol ester, the polyol ester is a reaction product of a neopentyl polyol and a monocarboxylic acid, and the amount of the plasticizer in the composition is 5-22 wt%. The EPDM composition does not damage the mixing property and the processability, and the hardness change of the obtained cross-linked product after a thermal aging test is the same as that of the cross-linked product under the condition of matching the same parts of alpha-olefin oligomer, and is greatly improved compared with that of the cross-linked product under the condition of matching aliphatic dibasic acid ester.

The invention provides a graphene dispersion liquid, a preparation method thereof and a water-based paint, aiming at solving the problem that the performance of graphene is influenced due to insufficient dispersion force and poor dispersion stability when a conventional dispersing agent is used for dispersing graphene in water in the prior art. The graphene dispersion liquid comprises a first solvent and modified graphene oxide, and the modified graphene oxide is dispersed in the first solvent; the modified graphene oxide comprises an inner core and a shell layer, the inner core is graphene oxide, the shell layer is a diene modified polymer, and the diene modified polymer is grafted on the inner core; the diene modified polymer comprises one or more of a cyclopentadiene modified polymer and a furan modified polymer. According to the graphene dispersion liquid provided by the invention, the diene modified polymer is grafted on the graphene oxide, and the graphene oxide is uniformly dispersed in the solvent by utilizing the hydrophilicity of the diene modified polymer, so that the graphene dispersion liquid with stable dispersion performance can be obtained.

The invention discloses an impact-resistant glass fiber composite material, which is prepared from the following components in parts by weight: 60 to 75 parts of polypropylene, 15 to 25 parts of long glass fiber, 5 to 10 parts of glass fiber chopped strand mat, 7 to 15 parts of high heat-resistant polymer, 0.3 to 0.7 part of antioxidant, 0.8 to 1.2 parts of flame retardant, 4 to 6 parts of elastomer POE (Polyolefin Elastomer), 1.5 to 2.5 parts of rubber blend EPDM (Ethylene-Propylene-Diene Monomer), 0.8 to 1.2 parts of flexibilizer MBS and 0.8 to 1.2 parts of carbon fiber. The invention relates to the technical field of high polymer materials, in particular to a high polymer composite material. The high polymer composite material is prepared from, by weight, 20-30 parts of high polymer, 0.3-0.7 part of nano filler nano silicon and 0.5-8 parts of compound crystallization nucleating agent. The antioxidant prevents oxidation and aging of the material and prolongs the service life; the flame retardant improves the flame retardant property of the material and increases the safety; the nano filler nano silicon improves the mechanical property and wear resistance of the material; the compound crystallization nucleating agent improves the crystallization property of the material, and further improves the strength and heat resistance of the material.

The invention relates to a transmission belt (10) comprising a body provided with at least one elastomer-based tooth (B), said at least one tooth comprising: - an ethylene-propylene-diene monomer in a proportion of between 85 and 100 parts, per 100 parts of elastomer; - natural rubber in a proportion at most equal to 15 parts; - and regenerated carbon black in a proportion of between 20 and 70 parts.

The invention relates to a process for realizing uniform foaming of an elastic rotating body through temperature gradient control, in particular to an elastic rotating body foaming forming process which comprises the following steps: S1, raw material pretreatment and internal mixing: adopting a blend of POE (Polyolefin Elastomer) and EPDM (Ethylene-Propylene-Diene Monomer) as a main body material, mixing POE and EPDM according to a mass ratio of 6: 4-8: 2, and carrying out extrusion molding; adding 3%-15% of an anti-shrinking agent, 8%-20% of talcum powder and 5%-12% of calcium carbonate as fillers, and mixing and plasticizing for 8-12 minutes through an internal mixer at the temperature of 80-100 DEG C and the rotor rotating speed of 30-50 rpm. According to the foaming forming process of the elastic rotating body, the shaping pipe and the built-in heating pipe are arranged in the middle of the mold cavity, so that the temperature of the middle of the mold cavity is 1-3 DEG C higher than that of the upper and lower areas, and therefore, an accurate axial temperature gradient is formed, the decomposition rate of a foaming agent and the material curing process are effectively balanced, and shrinkage deformation caused by uneven temperature is inhibited.

The invention discloses low-odor thermoplastic vulcanized rubber for an automobile skin as well as a preparation method and application of the low-odor thermoplastic vulcanized rubber. The raw materials comprise 50 to 80 parts of ethylene-propylene-diene copolymer rubber, 20 to 50 parts of polypropylene, 5 to 15 parts of a compatilizer, 0.5 to 2.5 parts of a compound cross-linking agent, 0.5 to 2.0 parts of an odor adsorbent and 0.5 to 1.0 part of an antioxidant. The preparation method comprises the following steps: banburying and blending, dynamically vulcanizing by using a first double-screw extruder, adsorbing and deeply devolatilizing by using a second double-screw extruder, and carrying out vacuum baking at 100 DEG C. By utilizing the synergistic effect of the cross-linking agent and the assistant cross-linking agent, the degradation of polypropylene is inhibited while the cross-linking efficiency is ensured, and a low-boiling-point reaction by-product (tert-butyl alcohol) is thoroughly removed through a multi-stage devolatilization process, so that the problems that the traditional TPV material is strong in odor and easy to atomize are solved. The smell grade of the obtained material is less than or equal to 3.0 grade, and the atomization value is lt; and the coating is suitable for high-end automotive trim skins.

The invention relates to the technical field of lithium ion battery assistants, in particular to an anode slurry dispersing, compacting and anti-cracking assistant for a lithium battery and a preparation method of the anode slurry dispersing, compacting and anti-cracking assistant. The anti-cracking aid is prepared from the following raw materials in parts by mass: 20-80 parts of a special polymer, 10-30 parts of a wetting agent, 10-30 parts of a plasticizer and 10-100 parts of a solvent, wherein the preparation raw materials of the special polymer comprise a vinyl monomer, an acrylic monomer, a diene monomer and an initiator; the wetting agent comprises the following raw materials: an amine compound and a hydrazine compound; and the plasticizer is polyether phosphate. When the additive is used for preparing the lithium battery positive electrode slurry, the slurry is uniformly dispersed and low in viscosity, the use of solvents can be reduced, the production process is shortened, and the actual use effect is excellent.

The invention relates to the technical field of cables, and provides a corrosion-resistant control cable and a preparation method thereof. The corrosion-resistant control cable sequentially comprises a conductor, an insulating layer, a shielding layer and a sheath layer from inside to outside, wherein the sheath layer comprises the following components in parts by weight: 50-70 parts of polyvinyl chloride, 15-25 parts of ethylene propylene diene monomer, 10-20 parts of modified graphene oxide, 0.5-1.5 parts of an antioxidant, 3-5 parts of a plasticizer, 15-20 parts of a flame retardant, 2-4 parts of a compatilizer, 4-5 parts of an active agent, 1-3 parts of an assistant crosslinking agent and 1-3 parts of a crosslinking agent; wherein the modified graphene oxide is obtained by modifying graphene oxide with dimethyl 5-hydroxyisophthalate and N-hydroxymethyl acrylamide. According to the technical scheme, the problem of insufficient corrosion resistance of the control cable in the prior art is solved.

The present disclosure relates to a process for polymerising olefins in multistage polymerisation process configuration. The process comprises polymerising, in a reactor, first olefin monomer, optionally in the presence of at least one alpha olefin comonomer, in the presence of a polymerisation catalyst to produce a first polymer component (A); polymerising, in a downstream gas phase reactor, second olefin monomer at a first operating pressure in the presence of the first polymer component (A) and optionally in the presence of at least one alpha olefin comonomer to produce a second polymer component (B) at a production rate that provides a weight ratio of first polymer component (A) to second polymer component (B) that is below a target threshold value; and increasing the first operating pressure to a second operating pressure in the downstream gas phase reactor when the weight ratio of first polymer component (A) to second polymer component (B) increases above the target threshold value.

The invention relates to the technical field of automobile sealing strips, and provides an anti-aging rubber sealing strip for an automobile and a preparation method of the anti-aging rubber sealing strip. The anti-aging rubber sealing strip for the automobile comprises the following components in parts by weight: 55-70 parts of ethylene propylene rubber, 30-45 parts of ethylene propylene diene monomer, 4-8 parts of an anti-aging agent, 35-60 parts of a filling agent, 3-7 parts of a softening agent, 8-10 parts of a plasticizer, 1.2-2.5 parts of an accelerant, 4-8 parts of zinc oxide and 1-2 parts of a vulcanizing agent. The anti-aging agent comprises diatomite-loaded tea polyphenol and a diatomite-loaded anti-aging agent. By means of the technical scheme, the problem that in the prior art, an automobile rubber sealing strip is poor in aging resistance is solved.

The invention discloses high-rubber-impact-resistance co-polypropylene and a preparation method thereof. The preparation method comprises the following steps: propylene is subjected to a homopolymerization reaction in a catalytic system; and adding the long-chain substituted diene mixed with the solvent in a copolymerization stage, and introducing mixed gas of propylene and other monoene for reaction to obtain the high-rubber anti-impact co-polypropylene. The long-chain substituted diene mixed with the solvent is added in the copolymerization stage, the crosslinking degree and the product uniformity of the high-rubber-impact-resistance co-polypropylene prepared by the method disclosed by the invention are remarkably improved, the introduction amount of the long-chain substituted diene is reduced, the cost is reduced, and the production efficiency is improved. In addition, the content of a rubber phase is broken through, the particle surface is not sticky, the viscosity index change is small after heating, the distribution and fluidity of the propylene copolymer are effectively controlled, and the low-temperature impact toughness is higher.