612 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.

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 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 invention discloses high-strength durable pervious concrete and a preparation method thereof, and belongs to the technical field of building materials. The concrete is prepared from the following raw materials in parts by weight: 160 to 220 parts of cement, 1200 to 1600 parts of coarse aggregate, 170 to 230 parts of fine sand, 160 to 200 parts of water, 3 to 4.5 parts of polycarboxylate superplasticizer, 5 to 15 parts of silica fume, 1 to 3 parts of polypropylene fiber, 8 to 12 parts of modified nano cellulose and 5 to 7 parts of flexibilizer, wherein the flexibilizer comprises modified graphene oxide, propylene glycol monomethyl ether and polyisoprene rubber. The interface compatibility is enhanced through the modified nanocellulose, microcracks are reduced, the bonding strength of aggregate and cement is improved, and the compressive strength is improved; the toughening agent component endows the concrete with toughness and durability, the toughening agent component and the toughening agent component have a synergistic effect, and the concrete prepared by mixing the various raw materials has excellent mechanical properties and durability on the basis of good water permeability, and has a wide market application prospect.

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 present disclosure provides a method for producing a polyisoprenoid, which makes it possible to synthesize in vitro a polyisoprenoid having an unprecedented structure, such as a 100% cis-polyisoprenoid or a polyisoprenoid containing an allylic diphosphate derivative as an initiating terminal. The present disclosure relates to a method for producing a polyisoprenoid in vitro, which employs a gene coding for a neryl diphosphate synthase and rubber particles bound to a protein encoded by the gene, or a method for producing a polyisoprenoid, which includes introducing into a plant a vector in which a gene coding for a neryl diphosphate synthase is linked to a promoter having a promoter activity that drives laticifer-specific gene expression to express a protein encoded by the gene specifically in laticifers.

The invention discloses SIS (styrene-isoprene-styrene) containing dynamic reversible bonds and a preparation method thereof, and belongs to the technical field of high polymer materials. The copolymer is prepared through a Diels-Alder reaction with bismaleimide on the basis of a polystyrene construction unit with two tail ends capped with furan and a polyisoprene construction unit module with two tail ends capped with furan. Wherein the DA bond has a thermal reversible characteristic. The furan end-capped building unit module with controllable molecular weight and narrow distribution is prepared, and reversible connection and dissociation of blocks are realized through a modularization strategy. According to the invention, an inverse Diels-Alder reaction can be carried out at 120-140 DEG C, and is dissociated into an original construction unit module, so that the proportion of soft and hard segments of a copolymer is changed by supplementing a specific construction unit feeding amount and carrying out the Diels-Alder reaction again; the SIS has the advantages of being accurate in structure and designable in performance at the same time, flexible regulation and control over the block proportion are achieved through the SIS containing the dynamic reversible bonds, and meanwhile the SIS has wide application prospects in the fields of recyclable adhesives, intelligent packaging, flexible electronics and the like.

The invention discloses a hot-melt loxoprofen sodium patch and a preparation method thereof, the hot-melt loxoprofen sodium patch comprises a backing layer, an adhesion layer and a protective layer, the adhesion layer comprises the following components in percentage by weight: 5-6% of loxoprofen sodium or its hydrate, 19-26% of styrene-isoprene-styrene block copolymer, 5-15% of polyisobutene, 5-15% of hydrogenated rosin glyceride and 40-50% of liquid paraffin; by optimizing the model and dosage of the styrene-isoprene-styrene block copolymer and the polyisobutene, the adhesive force and cohesive force of the loxoprofen sodium patch are improved at the same time through the combined action, and the long-term stability can be kept.

The invention discloses a rubber compound for manufacturing a medical sealing element and a preparation method of the rubber compound, and relates to the technical field of rubber. The rubber compound for manufacturing the medical sealing element is prepared by mixing the rubber composition, the composite modifier and the like; the rubber composition comprises chlorinated polyethylene rubber, isoprene rubber and modified liquid fluororubber, and the modified liquid fluororubber is prepared by reacting carboxyl-terminated liquid fluororubber with an isocyanate-terminated epoxy prepolymer. The isocyanate-terminated epoxy prepolymer is prepared by reacting resorcinol diglycidyl ether, N-methylethanolamine and an isocyanate polymer, and the isocyanate polymer is prepared by polymerizing hexamethylene diisocyanate, so that the chemical corrosion resistance and high temperature resistance of the rubber are enhanced; and the composite modifier is prepared by reacting multi-element copolyether ester with fluorinated polybutadiene, so that the final rubber compound has excellent low-temperature brittleness resistance and long-term stability while keeping high strength.

The invention relates to the technical field of coatings, and particularly discloses a low-temperature-resistant waterproof coating for an outer wall of a house building and a preparation process of the low-temperature-resistant waterproof coating. The water-based paint is prepared from the following raw materials in parts by mass: 200 to 250 parts of modified silicone acrylic emulsion, 75 to 125 parts of polyurethane-acrylate core-shell emulsion, 40 to 60 parts of polyether polyol modified nano filler, 15 to 25 parts of rubber nano powder, 10 to 20 parts of liquid polyisoprene, 22 to 34 parts of an auxiliary agent and 60 to 100 parts of a composite solvent. According to the low-temperature-resistant waterproof coating prepared by the invention, the elongation at break and the low-temperature bending resistance of a coating film are remarkably improved on the premise of keeping relatively good tensile strength and adhesive force.

The invention relates to the technical field of furniture protective films, in particular to a self-adhesive furniture skin-touch protective film which sequentially comprises an organic silicon release film from bottom to top, the organic silicon release film comprises a base material and a coating, the base material is a transparent polyethylene glycol terephthalate film with the thickness of 80-120 micrometers, and the coating is a transparent polyethylene glycol terephthalate film with the thickness of 80-120 micrometers. The coating is an organic silicon release agent coated on the base material, and the coating weight of the organic silicon release agent is 0.8-1.2 g / m; the pressure-sensitive adhesive layer comprises 60 to 70 weight percent of a compound system of a saturated hydrocarbon block copolymer and a hydrogenated styrene isoprene styrene block copolymer; 25 to 35 wt% of hydrogenated C9 petroleum resin; 3 to 5 weight percent of temperature-sensitive microcapsules; and 2 to 5 wt% of naphthenic oil. According to the invention, through the cooperation of innovative multi-layer structures, the product can maintain excellent comprehensive performance under different parameter configurations, and multiple requirements of the furniture protective film on easy construction, high transparency, strong protection, good touch feeling and aging resistance are met.

The invention relates to the field of cosmetics, and particularly discloses a novel magical color magnetic plane water-gloss cream and a preparation method thereof.The novel magical color magnetic plane water-gloss cream is prepared from, by weight, 20%-60% of hydrogenated polyisobutene, 10%-55% of isononyl isononanoate, 1%-15% of styrene / isoprene copolymer, 0.1%-8% of dextrin palmitate, 0.2%-16% of film-forming agent, 0.01%-0.5% of antioxidant, 0.1%-1% of preservative and 0.01%-10% of magnetic pearling agent. And 0.35-13% of a humectant. A wax-free formula is adopted, a transparent raw material is used as a basis, a magnetic pearling agent with magnetic attraction force is matched, filling can be carried out through a mold with a magnet, magnetic pearling agent particles are induced to be directionally arranged, formed patterns can be not limited according to mold modeling, a common filling machine is adopted as filling equipment, and products with uniform formula, color and pattern lines can be obtained. And the formula paste is transparent and stable, and has good skin feeling and makeup effect.

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.

Provided is a binder including a polymer having a hydroxyl group, wherein the polymer includes a structural unit derived from an unsaturated carboxylic acid-based monomer, and a structural unit derived from at least one hydroxyl group-containing monomer selected from the group consisting of 2-hydroxyethyl acrylate, allyl alcohol, and isoprenol, the content of the structural unit derived from the hydroxyl group-containing monomer is 5 mol % to 50 mol % based on the total amount of the polymer, the weight average molecular weight of the polymer is 1000 to 5000, and the pH is 6.5 or lower.

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 discloses a method for identifying algae bombardment type oil shale based on carbon isotopes and biomarkers, and belongs to the field of testing or analyzing materials by means of measuring chemical or physical properties of the materials.The method comprises the steps that firstly, Soxhlet extraction is conducted on a cleaned, dried and smashed sample, and soluble organic matter and residual rock powder are obtained; separating the soluble organic matter family components to obtain saturated hydrocarbon and aromatic hydrocarbon components; then extracting residual rock powder kerogen, and analyzing carbon isotope; the method comprises the following steps: according to gas chromatography-mass spectrometry biomarker data of saturated hydrocarbon and aromatic hydrocarbon components, obtaining a 4-methylstane index, a ratio of C30 tetracyclic polyisoprene to C27 rearrangement stane and a ratio of phenanthrene series to naphthalene series; and finally, analyzing a parameter correlation relationship, dividing parameter boundaries where different lithologic sample plumbing areas are located, and establishing an algae bomb type oil shale quantitative identification standard based on the carbon isotope and the biomarker. According to the method, scientific, accurate and reliable identification of the algae bombardment type oil shale is realized.

Use of a rubber composition in a tread for producing a tire, the rubber composition comprising: a rubber component, an inorganic filler containing silicon dioxide, a thermoplastic elastomer containing a functional group that reacts or interacts with a surface functional group of the inorganic filler and having a specific gravity of 0.80 to 1.00, wherein the functional group contained in the thermoplastic elastomer is at least one member selected from the group consisting of a hydroxyl group, an amino group, a carboxyl group, a silanol group, an alkoxysilyl group, an epoxy group, a glycidyl group, a polyether group, a polysiloxane group, and a functional group derived from a maleic anhydride, wherein the proportion of the thermoplastic elastomer is 1 to 30 parts by mass per 100 parts by mass of the rubber component, and wherein the thermoplastic elastomer is a block copolymer comprising a polystyrene as a hard segment and at least one member selected from the group comprising a hydrogenated butadiene / isoprene copolymer, a hydrogenated polybutadiene, and a styrene / butadiene copolymer as a soft segment.

The present invention relates to the technical field of data processing, and discloses a method and system for controlling an isoprene rubber polymerization reaction. The method and system comprise the following steps: collecting real-time reaction data and real-time image data of the isoprene rubber polymerization reaction; extracting features of the real-time reaction data and the real-time image data based on a pre-trained deep learning model to obtain time series features and image features; fusing the time series features and the image features based on a cross-modal attention mechanism to obtain a multi-modal joint representation; processing the multi-modal joint representation through a lightweight pre-trained model embedded with Arrhenius equation constraints to output a reaction prediction result; generating and executing a reaction control strategy based on the reaction prediction result through a fuzzy control method and an anti-saturation integral PID control algorithm to achieve control of the isoprene rubber polymerization reaction; and achieving effective control of the isoprene rubber polymerization reaction by deeply fusing multi-source data with a variety of advanced algorithms.

The application provides an isomerized eucommia elastomer and a preparation method and application thereof. The isomerized eucommia elastomer forms cis-isoprene structure in the molecular chain through self-isomerization reaction. By regulating the content of cis structure, the regulation of the regularity of the molecular chain is realized, so that the isomerized eucommia rubber no longer crystallizes at room temperature and exhibits high elasticity. Meanwhile, the suitable regularity enables the isomerized eucommia rubber to have self-reinforcing capacity and exhibit excellent mechanical strength. The application also provides a preparation method and application of the isomerized eucommia elastomer. The isomerization modification of the eucommia rubber is carried out by using a mercapto compound or a disulfide compound under the initiation of a free radical initiator. The high-performance isomerized eucommia rubber elastomer material obtained by the application does not change the original chemical structure and polarity of the eucommia rubber, has similar structure and performance to natural rubber, can make up for the problem of insufficient yield of natural rubber, and has wide application prospects in the fields of tires, conveyor belts, sealing rings, wearable devices and the like.

The invention relates to a rubber composition having improved tear strength. This composition is based on 20 to 50 phr of copolymer containing ethylene units and units of a 1,3-diene of formula CH2═CR—CH═CH2, the symbol R representing a hydrocarbon chain containing 3 to 20 carbon atoms, the ethylene units in the copolymer representing between 50 mol % and 95 mol % of the monomer units of the copolymer; 50 to 80 phr of polyisoprene comprising a content by weight of cis-1,4-bonds of at least 90% of the weight of the polyisoprene; a reinforcing filler; from 0.2 to 0.9 phr of zinc oxide; and a vulcanization system. The invention also relates to rubber articles comprising a composition according to the invention, in particular pneumatic tyres, at least one sidewall of which comprises a composition according to the invention.

The invention discloses freeze-thaw-resistant concrete and a preparation method thereof. The freeze-thaw-resistant concrete is prepared from the following raw materials: cement, river sand, gravel, water, isoprene rubber particles coated with paraffin on the surfaces and an additive, the preparation method comprises the following steps: uniformly mixing the river sand and the isoprene rubber particles coated with the paraffin on the surface, adding other raw materials, and uniformly mixing. Space generated after the isoprene rubber particles are extruded provides space for freezing expansion of free water, expansion pressure is relieved, the freeze-thaw resistance of concrete is improved, the surfaces of the isoprene rubber particles are coated with paraffin, and under the freeze-thaw condition, the paraffin is solidified, releases heat and reduces osmotic pressure and ice expansion pressure, so that the freeze-thaw resistance of the concrete is improved, and the service life of the concrete is prolonged. The paraffin surrounds the isoprene rubber particles, erosion of water to the isoprene rubber particles can be reduced, aging of the isoprene rubber particles can be inhibited, the thermal conductivity of the paraffin and the isoprene rubber particles is smaller than that of aggregate, temperature reduction of the aggregate can be inhibited, and the freeze-thaw resistance of the concrete is further improved.

The utility model relates to the field of medical supply devices, in particular to a polyisoprene gasket capable of improving the inward sinking risk, which comprises an inner cover wrapped on a bottle opening of a medical bottle and an outer cover tightly attached to the inner cover, and a rubber head convenient for a needle to pierce is arranged at the center position of the outer cover. The rubber head is provided with an anti-sinking assembly matched with the inner cover. The pressing part of the anti-sinking assembly abuts against the inner cover, so that the phenomenon of sinking is effectively improved, meanwhile, a medical medicine bottle does not permeate air, the use safety of medicine is guaranteed, meanwhile, acupuncture is convenient, and the phenomenon of medicine waste is reduced.

Provided is a method for producing a polymer latex, comprising a step for obtaining an emulsion by emulsifying a polymer solution of a synthetic polyisoprene and / or styrene-isoprene-styrene block copolymer in water in the presence of rosin and / or a metal salt of rosin; and a step of removing the organic solvent from the emulsion, in the rosin and / or the metal salt of the rosin, the content ratio of the total of abietic acid, neoabietic acid, pinolenic acid and salts thereof is 5% by weight or less, the content ratio of dehydroabietic acid is 80-100% by weight, and the content ratio of the rosin and / or the metal salt of the rosin is 5% by weight or less. The content ratio of the rosin and / or the metal salt of the rosin in the polymer latex is more than 1.5 parts by weight with respect to 100 parts by weight of the total of the synthetic polyisoprene and / or the styrene-isoprene-styrene block copolymer contained in the polymer latex.

The invention relates to a modified asphalt sizing material, which is prepared from the following components in percentage by weight: 35.5 to 38.5 percent of 70 # asphalt, 6.5 to 9.5 percent of base oil, 4.5 to 5.5 percent of aromatic oil, 3.5 to 4.5 percent of SBS (Styrene Butadiene Styrene), 5.5 to 6.5 percent of SIS (Styrene Isoprene Styrene), 5.5 to 6.5 percent of SBR (Styrene Butadiene Rubber) powder, 1.9 to 2.1 percent of blocked isocyanate, 0.06 to 0.08 percent of activating agent, 4.5 to 5.5 percent of porous silicon dioxide and 24 to 30 percent of powder. The modified asphalt sizing material can trigger the activating agent to catalyze the deblocking of the blocked isocyanate at the processing temperature of 180 + / -2 DEG C to release-NCO groups, the-NCO groups can react with trace moisture in an asphalt system to generate CO2 gas, in the rubber layer forming process, CO2 is wrapped by the asphalt in a viscoelastic state to form a uniform closed-cell foam structure, and in the forming process of a rubber layer, the modified asphalt sizing material can be used for forming an asphalt layer. According to the structure, liquid water permeation is blocked by utilizing the characteristic that the surface tension of liquid water is greater than that of a bubble wall, and an initial channel is constructed for vapor diffusion; furthermore, closed-cell foam is bridged by utilizing nano-pores of porous silicon dioxide, a'nano-pore adsorption-micropore diffusion 'three-dimensional vapor-permeable network is constructed, diffusion and discharge of water vapor are accelerated, liquid water is further blocked, and dynamic balance of waterproofness and breathability is realized.

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 discloses a method for preparing a secondary brominated branched butyl rubber. The method comprises adding a high molecular weight brominated grafting agent to a mixed solvent, stirring the mixture until the high molecular weight brominated grafting agent is completely dissolved, and obtaining a mixed solution; cooling the mixture, sequentially adding a diluent, isobutylene, and isoprene to the mixed solution, stirring and mixing the mixture, and obtaining a polymerization reaction system; and cooling the mixture again; mixing the diluent and a co-initiator, aging the mixture, and then adding the mixture to the polymerization reaction system, stirring and reacting the mixture, adding a terminator, and coagulating the material, washing, and drying the material to obtain a secondary brominated branched butyl rubber; the high molecular weight brominated grafting agent is a linear block copolymer composed of isoprene, styrene, and vinyl bromide. The preparation method of the invention not only solves the problem of slow stress relaxation rate of butyl rubber during processing, but also maintains sufficient green rubber strength and good air tightness, and provides a balance between physical and mechanical properties and vulcanization processing performance.

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.