270 results about "Isoprene" patented technology

The invention discloses a silane-crosslinked low-smoke halogen-free flame-retardant oil-resistant polyolefin cable material and a preparation method thereof. The method comprises the following steps: preparing a bio-based polyesteramide toughening phase which is pre-polymerized by castor oil-based polyamide and poly (butylene adipate-co-terephthalate) and is terminated by itaconic anhydride; the preparation method comprises the following steps: self-assembling phytic acid and melamine to wrap ammonium polyphosphate, so as to prepare supramolecular flame-retardant gel powder; the method comprises the following steps: grafting aramid pulp fibers by using a phosphorus-containing silane coupling agent to prepare a reactive liquid crystal reinforced phase; the preparation method comprises the following steps: blending and banburying the components with a hydrogenated styrene-isoprene-styrene block copolymer, an antioxidant and a peroxide cross-linking agent, carrying out dynamic vulcanization and interface bonding, and carrying out extrusion and electron beam irradiation to finally crosslink. An interpenetrating-topology network structure is formed in the prepared cable material, the crosslinking degree is larger than or equal to 82%, and the cable material is rapid in crosslinking, excellent in oil resistance, low in smoke and free of toxicity and is particularly suitable for super high-rise building hanging cables, deep sea exploration cables and new energy automobile liquid cooling cables.

The present invention relates to an adhesive composition for a polyester tire cord, a method for preparing a polyester tire cord, and a tire cord comprising the same, according to the present invention, when the polyester tire cord is prepared, the adhesive composition can be used for manufacturing a polyester tire cord, according to the present invention, the binding force between polyester fibers and a first treatment liquid can be increased by treating with the first treatment liquid containing a salt containing an anionic functional group, and then the crosslinking density can be increased by treating with a second treatment liquid containing an isoprene rubber latex, thereby not only having excellent high-temperature adhesive force, but also having excellent water resistance. And no harmful substances are used, so that the environment-friendly property is realized. In addition, uniform adhesion of the processing liquid is achieved by minimizing the influence caused by the external environment, thereby reducing the manufacturing manufacturability and the production cost. The polyester tire cord prepared as above can exhibit high heat-resistant adhesive force, rubber coverage, and excellent heat resistance characteristics.

The invention discloses a recyclable lawn and a preparation method thereof, and belongs to the technical field of artificial turfs. The lawn sequentially comprises artificial grass yarns, a base cloth layer and a back glue layer from top to bottom, the artificial grass yarns and the base cloth layer are made of polyolefin; the back adhesive layer is prepared from the following components in parts by weight: 4 to 8 parts of polyolefin elastomer, 10 to 20 parts of olefin block copolymer, 20 to 30 parts of hydrogenated styrene-butadiene copolymer, 8 to 12 parts of styrene-isoprene copolymer, 10 to 12 parts of butadiene-styrene rubber, 2 to 6 parts of ethylene-acrylic acid copolymer, 15 to 30 parts of plasticizer, 0.1 to 0.4 part of antioxidant, 3 to 6 parts of compatilizer and 2 to 4 parts of modified filler; according to the lawn, the artificial grass yarns, the base cloth layer and the gum layer are similar in component, so that the lawn can be conveniently and integrally recycled subsequently, the utilization rate of the lawn gum is increased, and resource waste is reduced.

The present invention relates to a packaged condom comprising a sealed package; and within the package, a condom comprising natural rubber latex and / or synthetic polyisoprene; wherein the condom comprises, on one or more surfaces thereof and in contact with the natural rubber latex and / or synthetic polyisoprene, an aqueous lubricant; wherein the aqueous lubricant comprises: a thickener and 5 wt.% to 30 wt.%, based on the total weight of the aqueous lubricant, of a humectant comprising at least one organic compound selected from the group consisting of glycerol, propylene glycol, polyethylene glycol, and any combination thereof; and one or more sugar alcohols having a molecular weight of from 120 to 10000 g / mol. It also relates to a method for preparing a packaged condom and to the use of an aqueous lubricant to lubricate one or more surfaces of a condom. The condom preferably presents a transparent appearance to the end user.

The invention relates to the technical field of high polymer material and automobile part manufacturing, and discloses a high-durability high-low temperature resistant automobile composite sealing strip, which is prepared from the following raw materials: ethylene propylene diene monomer, polyisoprene grafted maleic anhydride, pre-dispersed master batch, carbon black and a vulcanization system. The pre-dispersed master batch takes oxidized polyethlene wax as a carrier to wrap zinc oxide and D-mannitol. The phase change characteristic of the carrier is utilized, active components are isolated in the mixing and extruding stage, and scorching is prevented; the components are released in the high-temperature vulcanization stage to initiate anhydride ring opening, and a double cross-linked network with coexistence of covalent bonds and ionic bonds is constructed. According to the sealing strip, the macromolecular reactive plasticizer is used for replacing part of liquid paraffin, the atomization problem caused by micromolecule migration is solved, the high-temperature compression permanent deformation rate is remarkably reduced through a thermal reversible mechanism of an ion cluster, and excellent low-temperature rebound resilience and processing safety are both considered.

It has been unexpectedly found that certain neodymium catalyst systems can be used to copolymerize isoprene and 1,3-butadiene to produce random isoprene-butadiene copolymer rubbers which are not tapered. These random isoprene-butadiene copolymer rubbers have properties which are beneficial for use in rubber formulations for manufacturing a wide variety of rubber products, such as tires, hoses, conveyor belts, power transmission belts, and shoe soles. These random isoprene-butadiene rubbers are synthesized by copolymerizing (a) isoprene monomer or a substituted isoprene monomer and (b) 1,3-butadiene monomer in the presence of a neodymium catalyst system, wherein the neodymium catalyst system is prepared by (1) reacting a neodymium carboxylate with an organoaluminum compound in the presence of a conjugated diolefin monomer to produce neodymium-aluminum catalyst component, and (2) subsequently reacting the neodymium-aluminum catalyst component with an alkyl aluminum chloride to produce the neodymium catalyst system.

The invention belongs to the technical field of nano inorganic filler surface modification, and discloses modified nano calcium carbonate which is prepared by the following steps: reacting a nano calcium carbonate raw material with a compound modifier at 70-80 DEG C, and drying, crushing and grading after the reaction is completed, wherein the compound modifier is composed of a component A and a component B in a molar ratio of 1: (1.2-2.0); the component A is selected from p-sulfo calix [n] arene or salt thereof, and n is an integer from 4 to 8; and the component B is selected from epoxy group modified polyisoprene. According to the present invention, the modification formula of mixing the sulfonic acid calixarene compound and the epoxy group modified polyisoprene is used, the molar ratio of the two components is precisely regulated and controlled, and the exposure ratio of the active hydroxyl group in the system is reasonably controlled, such that the modification formula can be used for the modification of the nano calcium carbonate, the modified nano calcium carbonate can effectively improve the impact strength and thixotropy of the base coat and reduce the viscosity of the base coat, and finally, adaptive balance between the thixotropy and the processing fluidity is achieved.

The invention belongs to the technical field of materials, and discloses an anti-aging rare earth butadiene-isoprene rubber material and a preparation method thereof.The anti-aging rare earth butadiene-isoprene rubber material is prepared by taking rare earth butadiene-isoprene rubber as a base material and taking an inorganic reinforced additive, a composite anti-aging agent and the like as auxiliary materials through mixing and extrusion; wherein the inorganic reinforced additive is prepared by modifying epoxidized natural rubber on the surface of filler illite, and after surface modification, illite can exist in the material in a physical crosslinking core form, so that good stress absorption and stress dispersion effects can be generated, and the mechanical property of the material is enhanced; the compound type anti-aging agent structure not only contains an ammonia anti-aging agent, but also contains a benzimidazole anti-aging agent, so that a synergistic anti-aging effect can be realized through different action principles and action stages, and the anti-aging performance of the material is effectively enhanced.

The invention provides a preparation method of modified epoxy acrylate resin, which comprises the following steps: (1) mixing epoxy-terminated polyisoprene liquid rubber, unsaturated binary acid and a catalyst A for reaction A, and then adding polyol and a catalyst B for reaction B to obtain a modifier; and (2) mixing epoxy resin, unsaturated monocarboxylic acid, a catalyst A and a polymerization inhibitor for reaction C, then adding the modifier and the cross-linking agent in the step (1), and uniformly mixing to obtain the modified epoxy acrylate resin. The synthetic process is simple, the reaction endpoint is clear, the resin toughness is improved, the resin curing shrinkage rate is reduced, and the wettability with glass fibers is improved.

The present disclosure provides a conductive diaphragm and a speaker using same. The conductive diaphragm includes a main portion made of polymer material and a conductive portion located on the main portion. The conductive portion includes a substrate with a film layer and conductive material dispersed in the substrate, the film layer is solidified from at least one material of thermoplastic elastomer, phenyl silicone, isoprene rubber, or fluoroelastomer. Compared with the related technologies, the conductive diaphragm disclosed by the present disclosure has excellent atigue-resistant property and could maintain good adhesive strength and toughness.

The invention belongs to the technical field of PVC (polyvinyl chloride) materials, and particularly relates to a non-toxic PVC material for children's toys and a preparation method of the non-toxic PVC material. The non-toxic PVC material for the children's toys comprises the following components in percentage by mass: 30-50% of PVC powder, 20-40% of a plasticizer, 8-15% of a functional aid, 8-15% of an epoxidized soybean oil-calcium carbonate compound, 0.5-2% of a stabilizer and 0.1-1% of a lubricant, the functional auxiliary agent is prepared from maleic anhydride modified liquid polybutadiene rubber, ethylene-ethyl acrylate-maleic anhydride copolymer micro powder and a styrene-isoprene-styrene triblock copolymer. The non-toxic PVC material for children's toys provided by the invention is non-toxic, does not have the problems of stickiness, oil leakage and the like, and has excellent printability.

The invention discloses a flex-resistant rubber composition for a triangular belt compression layer and a preparation method thereof. The flex-resistant rubber composition is prepared from the following components in parts by weight: 70 to 80 parts of natural rubber, 20 to 25 parts of butadiene styrene rubber, 10 to 15 parts of liquid polyisoprene rubber, 20 to 25 parts of layered inorganic powder, 1 to 2 parts of maleic anhydride polybutadiene, 5 to 10 parts of blue cotton short fiber, 50 to 60 parts of carbon black, 5 to 10 parts of white carbon black, 3 to 5 parts of coupling agent, 2 to 4 parts of tackifier, 2 to 3 parts of plasticizer, 6 to 8 parts of activator, 1.5 to 2.0 parts of anti-aging agent, 0.5 to 1 part of zinc methacrylate, 1 to 2 parts of accelerant and 2.8 to 3.0 parts of sulfur. The liquid polyisoprene rubber is utilized to mechanically shear and modify the layered inorganic powder, and when the liquid polyisoprene rubber is used for the rubber composition, the layered slippage property is achieved, so that stress concentration is avoided. The blue cotton short fiber is cooperated to increase the strength, limit the movement of a rubber molecular chain, prevent crack propagation and improve the flex resistance.

The application belongs to the technical field of adhesives, and particularly relates to a rubber type removable pressure sensitive adhesive and a preparation method thereof. The application provides a rubber type removable pressure sensitive adhesive, and preparation raw materials include, by weight, 100 parts of styrene-isoprene-styrene block copolymer, 100-150 parts of tackifying resin, 30-70 parts of softening agent, 0.2-1.5 parts of main antioxidant and 0.2-1.5 parts of auxiliary antioxidant. The unique formula design of the application enables the adhesive to have excellent instantaneous adhesion and sufficient cohesion. The pressure sensitive adhesive of the application benefits from balanced viscoelasticity, and the adhesive can be separated in a clean interface during peeling, without any residue on the surface of the adherend (such as glass, ceramic tile and wooden paint surface) and without damaging the base material. By using hydrogenated resin and a composite antioxidant system, oxidative degradation is fundamentally inhibited, the product is not prone to yellowing, brittle and oiling during long-term use, and has a long service life.

To provide a tire for improving total performance of on-ice performance and wet grip performance.SOLUTION: A tire comprising a tread portion, the tread portion being formed from a rubber composition containing a rubber component, a filler containing silica, and a plasticizer, the rubber component containing more than 5% by mass and less than 50% by mass of a styrene-butadiene rubber, the rubber component contains an isoprene-based rubber and / or a butadiene rubber, a total content of the isoprene-based rubber and the butadiene rubber in the rubber component is more than 50% by mass, and a total styrene content S (% by mass) in the rubber component is less than 10, A content of the silica is more than 50 parts by mass based on 100 parts by mass of rubber components, the plasticizing agent contains C5 resins and / or C9 resins, a total content P (parts by mass) of the plasticizing agent is more than 40 parts by mass based on 100 parts by mass of the rubber components, and the tread portion includes two or more circumferential grooves and two or more lateral grooves, and one or more blocks defined by the circumferential grooves and the lateral grooves.SELECTED DRAWING: Figure 1

The present invention relates to a sulfur crosslinkable rubber compound, a vulcanized rubber, a component, and a corresponding vehicle tire, the sulfur crosslinkable rubber compound comprising at least one polyisoprene at 40 to 80 phr, at least one amino-functionalized butadiene rubber at 10 to 40 phr and having a cis content of less than 80%, and at least one functionalized SBR rubber at 10 to 50 phr.

A medical rubber part in which non-elution characteristics are maintained even after sterilization with gamma ray, a packaging article for the medical rubber part, and a medical rubber composition for manufacturing the medical rubber part can be provided or implemented. The medical rubber composition can contain or comprise: a (a) base polymer containing a halogenated isobutylene-isoprene rubber; a (b) polyethylene; and a (c) triazine derivative as a crosslinking agent. A proportion of the triazine derivative contained per 100% by mole of a halogen of the halogenated isobutylene-isoprene rubber contained in the (a) base polymer can be 1% by mole to 15% by mole.

The invention relates to the technical field of medical composite films, in particular to a medical high-barrier easy-to-tear composite film and a preparation method thereof, and the composite film sequentially comprises a printing layer, a high-barrier functional layer, an easy-to-tear adhesive layer and a heat sealing layer from outside to inside. Wherein the high-barrier functional layer is composed of a syndiotactic polystyrene film dispersed with metal organic framework nanoparticles and a fluorine-containing polyimide layer stacked on the inner side of the syndiotactic polystyrene film; the easy-to-tear adhesive layer comprises a hydrogenated styrene-isoprene-styrene block copolymer, hydrogenated petroleum resin and a polyethylene glycol-based shear thickening fluid microcapsule. Through the coordination of rigid support of the syndiotactic polystyrene film and damping dissipation of the microcapsules, the stripping force is stable and controllable; meanwhile, the fluorine-containing polyimide layer provides a rapid channel for sterilization gas, and the invention further provides a special preparation process of the composite film. The composite film has excellent high barrier property, sterilization adaptability and stable easy-to-tear property.

The present invention provides a damping rubber composition that can form a damping member with excellent damping properties in low-strain areas such as wind sway, while suppressing adhesion to rolls and having good processability. [Solution] The damping rubber composition contains (a) a base rubber, (b) a tackifier, (c) carbon black, (d) an inorganic filler with a particle size of 3 μm or more as measured by the air permeability method, and (e) a fatty acid derivative as a lubricant, wherein the (a) base rubber contains at least one selected from the group consisting of polyisoprene rubber and polybutadiene rubber, and the amount of (b) tackifier is 70 to 110 parts by mass, the amount of (c) carbon black is 100 to 160 parts by mass, the amount of (d) inorganic filler is 5 to 100 parts by mass, and the amount of (e) lubricant is 0.5 to 10 parts by mass per 100 parts by mass of the (a) base rubber.

The invention belongs to the field of material synthesis, and particularly relates to OCA of a rubber modified acrylate system and a preparation method of the OCA, and the OCA comprises matrix resin, a rubber modifier, a functional filler and an auxiliary agent; the matrix resin is selected from one or a combination of more of 2-ethylhexyl acrylate, methyl methacrylate and isobornyl acrylate; the rubber modifier is selected from one or a combination of more of natural rubber, butadiene styrene rubber, butadiene rubber, isoprene rubber and nitrile rubber; the functional filler is selected from nano silicon dioxide aerogel; the auxiliary agent is selected from one or a combination of more of a photoinitiator, a silane coupling agent, an antioxidant and an anti-ultraviolet aging agent. The problem of how to balance the OCA among low dielectric constant, high light transmittance, strong adhesion and flexibility is solved.

1. A method for polymerizing isoprene, the method comprising: (i) providing a dilithium initiator; (ii) introducing the dilithium initiator to isoprene monomers to form a polymerization mixture; and (iii) polymerizing the isoprene monomers to form polyisoprene, wherein the polyisoprene is characterized by a monomodal molecular weight distribution.

The present disclosure provides a paper feed roll that inhibits conveyance failure even during long term use by suppressing unevenness in the surface of an elastic material layer when the elastic material layer is formed by two or more phases. A paper feed roll 10 according to the present disclosure is provided with a shaft body 12 and an elastic material layer 14 formed on the outer peripheral surface of the shaft body 12. The elastic material layer 14 includes a first phase containing ethylene propylene diene rubber and a second phase containing one or more of either isoprene rubber or natural rubber. The area ratio of the second phase is within the range of 30% or more and 70% or less in a range of any given 2.5 μm×2.5 μm square of the elastic material layer 14.

This invention relates to the field of rare earth catalytic synthesis of rubber, and discloses a branched butadiene-isoprene copolymer and its preparation method. The preparation method includes the following steps: under a protective atmosphere, a composite branching agent is added to a butadiene and isoprene monomer solution, and then a rare earth catalyst is added to react fully to obtain the butadiene-isoprene copolymer; wherein the composite branching agent is prepared as follows: under a protective atmosphere, alkyl aluminum is added dropwise to a sulfur dichloride solution and reacted fully to obtain the desired composite branching agent; the present invention constructs a sulfur dichloride-alkyl aluminum composite branching agent, which is used in the branched butadiene-isoprene copolymerization reaction to obtain a branched copolymer with high cis structure content, excellent mechanical properties and processing properties.

The present invention relates to elastomer materials, and more precisely to an elastomer material blend of at least one polyisoprene polymer and at least one natural or synthetic polymer. The invention also relates to the method for preparing the blend and to the processing thereof by means of an electro-hydrodynamic process or an aero-hydrodynamic process, or to the combination of both processes.

The invention relates to the field of rubber, in particular to a rubber composition and a preparation method thereof. The preparation method of the rubber composition comprises the following steps: mixing the reinforcing material and water to obtain a mixed solution; mixing the mixed solution with a latex solution to obtain a mixture; and feeding the mixture to a spray fluidized bed dryer for spray drying to obtain the rubber composition, the latex solution comprises a natural rubber solution, a polybutadiene emulsion, a polyisoprene emulsion and a styrene butadiene rubber emulsion. The preparation method of the rubber composition is low in energy consumption and environmentally friendly, the filler and the auxiliaries in the obtained rubber composition are evenly dispersed, and meanwhile the rubber composition has the advantages of being good in mechanical property, high in wear resistance, high in wet grip performance, low in rolling resistance, high in safety and low in cost.

The present invention relates to an acoustic damping material comprising at least one liquid rubber LR at 25°C; at least one component CP selected from the group consisting of butyl rubber BR, natural or synthetic polyisoprene PI, and polyisobutylene PIB; at least one solid particle filler FM; and at least one chemical or physical expander BA. The acoustic damping material is suitable for use in damping undesirable vibrations and noises in mechanical structures and components of manufactured articles, is lightweight, and exhibits good heat resistance at 210°C. The present invention also relates to the use of acoustic damping materials for damping vibrations and noises in transport vehicles and white goods, vibration and noise damping elements comprising an adhesive layer made of acoustic damping material, a method for applying vibration and noise damping elements to a noise-generating surface of a substrate, and a vibration damping system comprising a substrate and vibration and noise damping elements bonded to the noise-generating surface of the substrate.

The application provides a kind of mechanical property research method of multi-component road marking material, it is related to road marking material analysis technical field, marking line material includes: acrylic resin 18-24%, pigment is polyisoprene modified titanium dioxide 3-8%, filler is 600 mesh double fly ash 35-50%, 40-80 mesh quartz sand 10-18%, glass bead is 20-80 mesh reflective glass bead 15-25%, organic bentonite 0.1-0.5%, accelerator 0.05-0.2%.The application provides a kind of multiscale synergistic method of molecular dynamics-finite element-experimental verification, realizes the through characterization and parameter inversion from nanoscale to macroscopic mechanical response, can quantitatively guide formula design and reveal micro stress mechanism, significantly reduces the development trial and error cost and cycle, improves the controllability of quality.Meanwhile it can also realize the balanced optimization and on-demand customization of material mechanical index, effectively improve the overall durability, crack resistance, wear resistance and service reliability of road marking, and reduce the life cycle cost.

An adhesive material includes an adhesive film, where the adhesive film includes a bonding layer and a first functional layer. The first functional layer includes a styrene-isoprene-styrene rubber and an additive, where the additive includes a wax or a polymer surfactant. With the first functional layer having the styrene-isoprene-styrene rubber and the additive provided, the adhesive material is capable of adjusting bonding strengths on both surfaces of the adhesive film through heat treatment and / or pressure treatment, and avoiding permeation and / or shifting between layers in the adhesive film, thereby improving the safety performance of the electrochemical apparatus.

The invention relates to an SIS (styrene isoprene styrene)-based adhesive capable of being cross-linked by UV (ultraviolet), the adhesive comprises SIS-based photosensitive resin obtained by acrylic acid graft modification and a photolysis type cross-linking agent, and a styrene-isoprene-styrene block copolymer at least contains 15 parts of a styrene hard segment block copolymer, the photolysis type cross-linking agent comprises at least one polymerizable olefinic bond and at least one photosensitive bond which can be broken by UV light. According to the invention, the SIS block copolymer is used for grafting modification, and the grafting type adhesive is used for'grafting 'different monomers or polymer chains to a main chain through chemical bonds to form a stable copolymerization structure, so that the problem of phase separation or poor compatibility caused by physical mixing in a mixed type is avoided.

A rubber composition for use in a vibration-damping rubber laminate, and a vibration-damping rubber laminate, are provided, exhibiting excellent inhibition of hardening phenomena. The rubber composition for use in a vibration-damping rubber laminate comprises the following components (A) to (C), wherein, relative to 100 parts by weight of component (A), the content of component (B) is 10 to 30 parts by weight: (A) at least one of isoprene rubber and butadiene rubber; (B) a plasticizer with a molecular weight of 300 to 900; and (C) a DBP with an oil absorption capacity of 100 ml / 100 g or more, an iodine adsorption capacity of 150 mg / g or more, and a nitrogen adsorption specific surface area of ​​140 m². 2 / g or more of carbon black.

This invention relates to the field of lubricant technology, specifically to a lubricant for agricultural machinery and its preparation method. This agricultural machinery lubricant, by weight, comprises the following components: 85-93 parts of a first base oil, 2.0-3.0 parts of 1,3-bis(3-phenoxyphenoxy)benzene, 0.2-0.3 parts of zinc dialkyl dithiophosphate, 0.5-1.0 parts of a graphene-based anti-wear additive, 2.0-4.0 parts of polyisobutylene succinimide, 0.5-1.5 parts of a hindered phenolic antioxidant, 1.5-3.0 parts of hydrogenated styrene-isoprene copolymer, and 0.2-0.6 parts of polymethacrylate; wherein the first base oil comprises poly(α-olefin) PAO4 and paraffin oil in a weight ratio of 2-3:1. The agricultural machinery lubricant provided by this invention improves the anti-wear and friction-reducing properties of the graphene-based anti-wear additive, and enhances the stable dispersibility of functionalized graphene in the oil phase and its interfacial properties with the oil phase.