641 results about "Natural rubber" patented technology

The invention discloses bamboo composite rubber for shoe soles and a preparation method thereof, and relates to the technical field of rubber products, the bamboo composite rubber comprises the following specific components: natural rubber, bamboo powder, polyurethane, a silane coupling agent, a plasticizer, an anti-ultraviolet agent and an antibacterial agent, and a rubber matrix is formed; the bamboo composite rubber for the shoe sole further comprises additives, and the additives comprise hyperelastic nanoparticles, an environment-friendly water-based coating, a wear-resistant reinforcing agent, a heat-conducting polymer, a negative ion release material, bamboo charcoal fibers and odor-resistant molecules. According to the bamboo composite rubber for the shoe sole and the preparation method of the bamboo composite rubber, through dual surface modification of the silane coupling agent and the negative ion release material, the bonding force of the bamboo powder and a rubber matrix is remarkably improved, and the composite material has higher mechanical strength and durability. Meanwhile, due to the synergistic effect of the hyperelastic nanoparticles, the heat-conducting polymer and the wear-resistant enhancer, the sole material not only has excellent elasticity and wear resistance, but also has heat-conducting and comfort-adjusting functions.

The high-performance insulation blanket comprises a surface layer, an EVA adhesive layer and a surface layer which are sequentially arranged, and the surface layer and the EVA adhesive layer are attached in a calendering mode; the surface layer is prepared from the following raw materials in parts by weight: 45 to 55 parts of ethylene-vinyl acetate copolymer, 10 to 20 parts of natural rubber, 8 to 18 parts of PA6 short fiber, 7 to 10 parts of dopamine modified mica powder, 6 to 10 parts of MAH-g-EVA, 10 to 15 parts of flame retardant, 0.2 to 0.4 part of antioxidant, 0.8 to 1.2 parts of lubricant and 2 to 4 parts of coloring agent. In the surface layer formula system, under the synergistic effect of the natural rubber, the PA6 short fiber and the dopamine modified mica powder, the tear resistance and puncture resistance of the material are greatly improved, and meanwhile, the material has excellent comprehensive properties such as high temperature resistance, insulation, flame retardance and aging resistance, and is suitable for the field of high-requirement insulation protection.

The invention discloses a bio-based flexible cementing material and a cold-mix asphalt mixture, and relates to the field of adhesives. The bio-based flexible cementing material comprises 80-85 wt% of a component A and 15-20 wt% of a component B, the component A comprises bio-based polyol, natural asphalt, natural rubber, a tackifier and a bio-based plasticizer according to a weight ratio of (160-180): (45-55): (75-85): (140-160): (380-410), and the component B is an isocyanate cross-linking agent. The bio-based flexible cementing material is used as a cementing material of a cold-mixed asphalt mixture, can be directly constructed at low temperature or normal temperature, does not need to be heated to improve the flowability, is convenient to construct, can form a stable skeleton structure through crosslinking, and can form a stable structure under the cooperation of natural rubber and natural asphalt. The bio-based flexible cementing material has both high temperature resistance and low temperature resistance, and the stability of a road structure can be improved.

The invention relates to the technical field of flame retardants, in particular to a preparation method of a bio-based environment-friendly flame retardant and flame-retardant modified natural rubber of the bio-based environment-friendly flame retardant. The preparation method comprises the following steps: selecting raw materials and carrying out an operation treatment reaction based on the selected raw materials, based on a selected raw material operation treatment reaction method, a polyhydroxy bio-based monomer is selected to react with a phosphorus-containing monomer to prepare a bio-based flame retardant; or a multi-amino bio-based monomer is selected to react with a phosphorus-containing monomer to prepare a bio-based flame retardant, and the prepared bio-based flame retardant is mixed with the natural rubber to prepare the flame-retardant natural rubber composite material, so that the flame-retardant property of the natural rubber is improved, and the mechanical property of the natural rubber is ensured not to be lost.

The invention provides a double-sided rubber yoga mat processing technology which comprises the following steps: S1, respectively preparing an A-side natural rubber coiled material and a B-side natural rubber coiled material: carrying out plasticizing treatment on a natural rubber raw material at the plasticizing temperature of 60-90 DEG C for 10-30 minutes; s2, color master batches are added into the plasticized natural rubber for mixing, color master batches of different colors are adopted for the A face and the B face respectively, and the adding amount of the color master batches accounts for 1-5% of the total weight of the rubber; s3, the mixed rubber sizing material and fine cloth are synchronously fed into a foaming furnace through continuous compounding equipment, foaming forming is conducted at the temperature of 160-200 DEG C, and a coiled material formed by compounding a rubber layer with a porous structure on the surface and the fine cloth is formed; s4, the A-face coiled material and the B-face coiled material are continuously compounded through a hot pressing roller, and the hot pressing temperature is 120-150 DEG C; the problems that a traditional yoga mat is single in double-sided function, low in compounding process efficiency and high in interlayer stripping risk are solved.

The invention discloses a deodorization flora liquid, a natural acquisition method thereof and application of the deodorization flora liquid in rubber primary processing, and belongs to the field of natural rubber processing, and the deodorization flora liquid comprises the steps of bacteria-containing soil sample screening, flora purification, flora stability testing and flora amplification culture. Wherein the bacteria-containing soil sample is from a whey waste dumping place, a secondary glue stacking place or soil which is subjected to whey treatment and has an odorless fermentation phenomenon; deodorizing flora purification comprises the following steps: by using whey waste obtained by rubber processing as a culture medium, removing antagonistic bacteria through multi-generation stable culture, detecting flora stability through high-throughput sequencing, and carrying out standing fermentation culture, so as to obtain a deodorizing flora solution with an efficient deodorizing effect. When being applied to deodorization treatment of rubber primary processing, the strain can obviously reduce the emission of malodorous gas in each production and processing link of natural rubber, has the advantages of wide flora source, simplicity in operation, no need of large-scale equipment and expensive reagents, low cost and the like, is expected to be popularized and applied in rubber primary processing, and realizes green production of natural rubber.

The invention relates to the field of rubber, and provides a wet rubber compound containing natural rubber and a preparation method thereof, the wet rubber compound containing natural rubber comprises the following raw materials by weight: 90-110 parts of natural rubber, 30-50 parts of a filler, 2-4 parts of modified sepiolite, 3-7 parts of an anti-aging agent, and 150-200 parts of deionized water. The wet-process rubber compound containing natural rubber provided by the invention has good dispersibility, mechanical properties and wear resistance, and has good commercial application value.

The invention relates to the technical field of breathable shoe soles, in particular to a breathable shoe sole structure and a using method thereof, and the breathable shoe sole structure comprises the following raw materials in parts by weight: 45-50 parts of butadiene rubber, 15-20 parts of natural rubber, 7-11 parts of butadiene styrene rubber and 7-10 parts of a processing aid. According to the breathable shoe sole structure, butadiene rubber, natural rubber and butadiene styrene rubber are adopted as matrixes, the processing aid is adopted as a functional aid for cooperation, meanwhile, the modified inserting agent and the modified nano whisker agent are added for blending and cooperation, the breathability, elasticity and wear resistance of a product are improved in a balanced mode, and the weather resistance and folding resistance stability of the product are remarkable.

The invention discloses a collecting and scraping integrated natural rubber collecting robot and a rubber collecting method, and the collecting and scraping integrated natural rubber collecting robot comprises a walking mechanism, a multi-degree-of-freedom mechanical arm, a collecting and scraping integrated mechanical claw, a rubber collecting box and a rubber bowl fixer. The collecting and scraping integrated mechanical claw comprises a plurality of bowl grabbing claw fingers, the outer side faces of the bowl grabbing claw fingers are provided with bowl wall dry glue scraping pieces used for conducting dry glue scraping on the inner side walls of the rubber bowls, and the bottom ends of the bowl grabbing claw fingers are provided with multifunctional claw toes. The bowl grabbing claw fingers, the bowl wall dry glue scraping pieces and the multifunctional claw fingers are integrated into a whole to form the collecting and scraping integrated mechanical claw, the collecting and scraping integrated mechanical claw is used in cooperation with a multi-degree-of-freedom mechanical arm, and under the combined action of multiple actions of rotating, lifting and opening and closing, the mechanical claw can be folded and scraped. According to the glue collecting device, multiple functions of grabbing and reversing glue bowls, scraping glue on the bottom surfaces of the glue bowls, scraping glue on the inner side walls of the glue bowls, clamping solidified glue blocks and crushing the solidified glue blocks can be realized, the problem that dry glue and glue blocks in the bowls cannot be collected in the prior art is solved, and the glue collecting quality and the glue collecting efficiency are improved.

The invention discloses a high-strength and high-deformation bio-based polyester elastomer and a preparation method thereof, and belongs to the technical field of composite material preparation, the high-strength and high-deformation bio-based polyester elastomer comprises the following raw materials by weight: 100 parts of a total polymer matrix, 15-40 parts of a filler, 0-0.5 part of an activator and 0.5-1.5 parts of a vulcanizing agent; wherein the total polymer matrix consists of bio-based polyester and another bio-based material epoxidized natural rubber, and the mass ratio of the bio-based polyester to the epoxidized natural rubber is (1: 0)-(3: 1). The bio-based polyester elastomer is prepared from the raw materials in a mechanical blending manner, and compared with pure polyester, the tensile strength and the elongation at break of the polyester elastomer are remarkably improved.

The utility model discloses a production line layout for automatically storing and drying flaky natural rubber. Comprising a feeding section, an airing warehouse, a heat pump drying warehouse, a finished product temporary storage warehouse and a finished product discharging section, the feeding section conveys rubber sheets through a feeding conveyor, and the discharging section conveys the rubber sheets through a finished product conveyor; the films are hung on the hanging rack from the airing warehouse, the heat pump drying warehouse and the finished product caching warehouse through hanging rods; the hanging rack is in rolling connection with the tracks in the airing warehouse, the finished product caching warehouse and the heat pump drying warehouse respectively; shuttle vehicles are arranged between the feeding section and the air-drying warehouse, between the finished product temporary storage warehouse and the finished product discharging section, between the air-drying warehouse and the heat pump drying warehouse and between the finished product temporary storage warehouse and the heat pump drying warehouse and are used for conveying hangers; the shuttle vehicle comprises transverse rails and a vehicle body, and the transverse rails are located at feeding ports and discharging ports of the airing warehouse and the finished product temporary storage warehouse correspondingly. The consistency and the yield of the product quality after the sheet rubber is dried are improved, and the drying uniformity and the drying efficiency are improved.

The present invention relates to improved cellulose nanocrystal fillers for rubber compositions, and more particularly to the grafting of disulfides and thioesters onto cellulose nanocrystals to improve performance as fillers in rubber compositions. At least one embodiment describes a method of grafting a thiol or disulfide on a CNC surface by, for example, esterification of 3-mercapto-propionic acid (MPA), 3-(acetylthio) propionic acid (APA), or dithiodipropionic acid (DTDPA). The reaction can be carried out on CNC that is highly dispersed in a suitable solvent and the reaction conditions are improved to achieve an advantageous degree of substitution DS. Embodiments further disclose how the surface thiol groups may then be protected in a second step as thio esters or asymmetric disulfides to modulate the hydrophobicity of CNC to improve compatibility with styrene-butadiene, SBR or natural rubber.

The invention provides a method for evaluating the processability of natural rubber, which uses RPA test to determine optimal test conditions and test means, and combines a nonlinear data fitting analysis method to overcome the problem that a corresponding relationship between conventional raw material test items and results of natural rubber and the viscosity of natural rubber in actual use cannot be established. And the viscosity of the natural rubber in actual use can be better, so that the viscosity processability difference of the natural rubber raw material can be better tested and represented, the purchase of the raw material and the adjustment of the processing technology are guided, and the quality of the rubber product is more sufficiently ensured. And particularly, the processing performance of the natural rubber when the Mw is relatively close can be evaluated.

The invention discloses lithium ion battery diaphragm slurry and a lithium ion battery diaphragm, and belongs to the technical field of lithium batteries. Furyl polyamide and bio-based nanofibers are added into the diaphragm slurry on the basis of polymethyl methacrylate; the bio-based nanofiber is a fiber with a cross-linked network structure formed by natural rubber and furyl polyamide under the cross-linking action of bismaleimide, ceramic particles in the bio-based nanofiber can be tightly embedded into the fiber, the hydrophilicity of the fiber is improved, the fiber structure is compact and stable, and the heat resistance is excellent. The raw materials for preparing the slurry are environment-friendly, the environmental pollution hazard is low, the slurry is uniform, and the synergistic effect of the materials can endow the diaphragm with better thermal stability and mechanical properties. And by utilizing the reverse reaction of a fiber cross-linked structure at high temperature, the fibers with loose structures cover the peripheral pores of the coating layer, so that high-temperature pore closing is realized, and the safety of the diaphragm is improved.

The invention discloses a cold-drawing heat-setting high-elasticity cowhells belt composite material, and relates to the technical field of composite materials. The invention relates to a cold-drawing heat-setting high-elasticity cowhells belt composite material. The composite material is prepared from the following raw materials in parts by weight: 12 to 18 parts of nano calcium carbonate, 0.1 to 0.4 part of silane coupling agent KH-550, 30 to 40 parts of modified thermoplastic polyurethane, 18 to 22 parts of ethylene-vinyl acetate copolymer, 5 to 8 parts of natural rubber, 3 to 5 parts of diisononyl phthalate, 0.3 to 0.5 part of compound antioxidant, 0.2 to 0.4 part of ultraviolet light absorber UV-9, 6 to 8 parts of aramid short fiber and 0.2 to 0.5 part of zinc stearate. 10 to 15 parts of modified polyethylene terephthalate fiber, 0.2 to 0.3 part of graphene and 0.5 to 1.5 parts of organic silicon treatment liquid. According to the cold-drawing heat-setting high-elasticity cowhells belt composite material, a matrix is reinforced through modified thermoplastic polyurethane and modified polyethylene terephthalate fibers, and the strength is improved through aramid short fibers subjected to plasma pretreatment. Molecular orientation is optimized by a cold drawing and heat setting process, weather resistance is enhanced by an organic silicon coating, and good overall elasticity, high strength and excellent wear resistance and weather resistance are achieved.

The invention belongs to the technical field of chrysanthemum picking and collecting, and discloses a mature chrysanthemum picking and collecting device which comprises a picking plate frame, the outer wall of the end, close to the bottom, of the picking plate frame is fixedly connected with a hook-and-loop fastener bandage used for being connected to a human body, and the picking plate frame is provided with a picking part; the rotating handle is driven by the rotating turntable to rotate, so that the rotating handle slides in the arc angle groove in the rocking plate, the rocking plate and the toothed bar are driven to swing by taking the T-shaped shaft rod as the shaft point, the artificial leg is matched with the swing of the toothed bar to gradually advance in a step-lifting manner, the toothed bar can penetrate through the stalks of the chrysanthemums back and forth, and the mature chrysanthemums can be inserted into the toothed bar in a step-lifting manner. Flowers and plants can be rapidly separated, damage to petals is small, complete corollas can be reserved, and damage to the surfaces of chrysanthemum stalks can be avoided due to the fact that the rod body at one end of the toothed rod used for penetrating through a flower cluster is made of natural rubber.

The utility model provides a closed impeller mould, which belongs to the technical field of moulds and comprises a lower mould, a middle mould, an upper mould, a main framework and a plurality of blade moulds, the lower mould, the main framework and the upper mould are sequentially arranged from bottom to top, the plurality of blade moulds are circumferentially inserted into the main framework, and the middle mould is sleeved on the peripheries of the plurality of blade moulds and the upper mould; the main framework is provided with a rear cover plate framework and a front cover plate framework, the rear cover plate framework and the front cover plate framework are connected through a plurality of blade frameworks, a rear cover plate cavity is formed in the periphery of the rear cover plate framework, a front cover plate cavity is formed in the periphery of the front cover plate framework, and blade cavities are formed in the peripheries of the blade frameworks; an overflow groove is formed in the inner wall of the middle mold; exhaust holes are formed in the middles of the upper mold and the blade mold. The closed impeller mold provided by the utility model can meet the universal preparation of a polyurethane impeller and a natural rubber impeller, is simple in structure, can realize the preparation of two impellers made of different materials, reduces the mold cost, and improves the production efficiency.

The invention belongs to the technical field of rubber processing and aircraft tire manufacturing, and particularly relates to a rubber composition, a preparation method thereof and application of the rubber composition as wave-shaped steel wire coating rubber of an aircraft radial tire. The rubber composition provided by the invention is prepared from 100 parts of natural rubber, 78 to 100 parts of a reinforcing system, 1.2 to 1.5 parts of a silane coupling agent, 3.5 to 6 parts of a bonding system, 0.3 to 0.5 part of a bonding promoter, 3.5 to 5.3 parts of an aging protection system, 2 to 5.7 parts of a crosslinking system, 6 to 6.5 parts of a crosslinking activation system, 5 to 8 parts of a plasticizing system and 3 to 5 parts of tackifying resin. The rubber composition provided by the invention has the advantages of excellent heat resistance, low compression fatigue temperature rise, high tensile strength and high elongation at break, and can form good adhesion with a wavy steel wire, so that the service life of the aviation radial tire is remarkably prolonged, the safety performance of the aviation radial tire is remarkably improved, and the puncture resistance of the aviation radial tire is effectively enhanced.

The invention relates to the technical field of shoe materials, in particular to a high-elastic wear-resistant sports shoe material and a preparation method thereof, and the high-elastic wear-resistant sports shoe material comprises the following raw materials in parts by weight: 40-45 parts of a modified EVA body, 30-35 parts of natural rubber, 8-12 parts of a reinforcing agent, 8-12 parts of a nano-silver agent, 5-8 parts of zinc oxide, 3-5 parts of calcium stearate, 2-3 parts of an AC foaming agent, 2-3 parts of paraffin, 0.5-0.8 part of a cross-linking agent and 1-3 parts of an anti-aging agent. According to the sneaker material, the modified EVA body is matched with the natural rubber, and the zinc oxide, the calcium stearate, the AC foaming agent, the paraffin, the cross-linking agent and other raw materials are added to serve as functional auxiliaries, so that the prepared sneaker material can improve the elastic property and wear resistance of a product, can inhibit bacterium breeding and can improve the performance effect of the product.

The invention belongs to the field of sealing of electronic products, and particularly relates to a water-based sealant as well as a preparation method and application thereof. The water-based sealant contains a water-based acrylate emulsion, a water-based polyurethane emulsion, a natural rubber emulsion, a penetrant and a water-soluble chelating agent in a mass ratio of 100: (25-45): (5-20): (0.1-1): (1-5); the solid content of the water-based sealant is 60-65 wt%, and the viscosity of the water-based sealant at the temperature of 25 DEG C is 400-600 cps. The water-based sealant provided by the invention not only is good in environmental protection property, but also is high in bonding strength and good in sealing performance, and meanwhile, the water-proof sealing treatment can be carried out on electronic workpieces in batches, so that the production efficiency is high.

The invention relates to the bonding of one or more strands of Glass-Resin composite, abbreviated to "CVR", characterized in that it comprises the following steps: a) a step of pre-adhesion of one or more strands of CVR composite is carried out by dipping the strand(s) in a first aqueous bath comprising a composition based on: - an epoxy compound; and - a blocked diisocyanate compound; b) a step of deposition on the strand(s) of CVR composite is carried out by dipping the strand(s) of CVR composite in a second bath comprising an aqueous adhesive composition based on: - at least one compound A1, the compound A1 comprising at least one aldehyde function, - at least one phenol A21;- at least one unsaturated elastomer latex comprising at least one elastomer chosen from the group consisting of butadiene copolymers, styrene-butadiene copolymers, vinylpyridine-styrene-butadiene terpolymers, natural rubber with the exception of chlorinated natural rubber, and mixtures of these elastomers;The content of blocked diisocyanate compound in the aqueous adhesive composition of the second bath is at a mass rate strictly less than 0.50%.;

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 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.

Cooling system (1) for cooling a light source (11) in a light module (10) of a lighting device of a vehicle, in particular a headlight, comprising a receiving body (12) of the light module (10) for receiving the light source (11) and a heat sink (13) arranged at a distance from the receiving body (12), and wherein a heat transfer medium is arranged between the receiving body (12) and the heat sink (13) by means of a heat pipe (14) for heat transfer, wherein the heat pipe (14) is connected to the receiving body (12) with a hot side and to the heat sink (13) with a cold side, wherein the heat pipe (14) has at least a section of a flexible area (15) so that the receiving body (12) is movable relative to the heat sink (13) while maintaining heat transfer, wherein the flexible area (15) is limited to a section of the heat pipe (14).such that the heat pipe (14) has, through the flexible section (15), a first pipe section (14a) connected to the receiving body (12) and a second pipe section (14b) connected to the cooling element (13), wherein the pipe sections (14a, 14b) are movable relative to each other and form a two-part outer pipe (18), wherein the flexible section (15) is formed by at least one flexible sleeve (16, 17) made of a plastic or of a natural rubber, wherein the pipe sections (14a, 14b) are connected to each other by the flexible sleeve (16, 17), and wherein a continuous capillary structure (20) is arranged on the inside of the outer pipe (18) and the flexible sleeve (16, 17), which is configured to follow a flex movement of the flexible sleeve (16, 17).

The invention belongs to the technical field of bio-based polymer composite materials, and particularly discloses a composite foam material with excellent performance and a preparation method thereof. The composite foaming material comprises 80-95 parts of polylactic acid; 5-20 parts of natural rubber; and 1-9 parts of epoxy natural rubber. According to the invention, the epoxy natural rubber is introduced as a reactive compatibilizer by a melt blending method, and an epoxy group of the epoxy natural rubber is mixed and entangled with a polylactic acid terminal hydroxyl group, and an isoprene main chain of the epoxy natural rubber can be mixed and entangled with a non-polar natural rubber chain to form a polylactic acid-epoxy natural rubber-natural rubber chemical bonding interface; by combining with a supercritical CO2 rapid heating foaming process, precise regulation and control of a foam structure are realized, and the green, light-weight, high-tensile-strength and equivalent-toughness composite foam material is prepared.

To provide a golf ball that rolls in a lowered distance on fairway wood shots.SOLUTION: A golf ball comprises a spherical core, an intermediate layer covering the spherical core, and an outermost cover positioned outside the intermediate layer and provided with a plurality of dimples. The spherical core is formed from a rubber composition containing a base rubber, a co-crosslinking agent, and a crosslinking initiator, the base rubber contains natural rubber, and in a surface area of a virtual sphere assumed to have no dimples on the outermost cover, an occupation ratio of a total area of the plurality of dimples is 45% or more and less than 75%.SELECTED DRAWING: Figure 1

The present invention provides: a rubber composition for sidewalls, the rubber composition being capable of producing a sidewall that has excellent flex fatigue resistance and is capable of improving low fuel consumption performance; and a sidewall which uses this rubber composition for sidewalls in at least a part thereof.　This rubber composition for sidewalls contains, with respect to 100 parts by mass of a solid rubber (A) that contains natural rubber and / or an isoprene rubber (A1) and a butadiene rubber (A2), 0.1-30 parts by mass of a modified liquid diene rubber (B) that has a functional group derived from a silane compound satisfying a specific condition, and 5-80 parts by mass of a filler (C) that contains a specific silica (C1).

The invention belongs to the technical field of numerical control machining of aluminum alloy hubs, and discloses multi-axis numerical control turning and milling combined machining equipment for multi-axis linkage of aluminum alloy hubs, which comprises a numerical control turning and milling combined machining head, one end of the numerical control turning and milling combined machining head is fixedly connected with a shaft fixing chuck used for placing and connecting a machining workpiece, and the other end of the numerical control turning and milling combined machining head is fixedly connected with a spindle. A numerical control clamping and fixing part is arranged in the inner wall of the shaft fixing chuck and used for rigidly clamping and fixing a machined workpiece, a flexible clamping and fixing part is arranged in the inner wall of the shaft fixing chuck and used for flexibly clamping and fixing the machined workpiece, and a clamping calibration assembly is arranged in the flexible clamping and fixing part. Initial fixation is provided through cooperation of a slope clamp and a rubber filler strip, a rigid clamping layer is formed through feedback closed-loop control of an electric cylinder by a pressure sensor, a natural rubber ball body is embedded in a rubber sleeve, and a flexible compensation layer is formed by self-adaption to workpiece deformation and dynamic compensation vibration deviation under the suction action of an elastic corrugated pipe.

The invention relates to the technical field of natural rubber modification, in particular to a flexible long-chain chain extender as well as a preparation method and application thereof. The structural general formula of the flexible long-chain chain extender is A-[flexible chain segment]-A, wherein: the [flexible segment] is a polyether polyol chain or a polyester polyol chain having a number average molecular weight of 500 to 5000 g / mol; a is an isocyanate group or an anhydride group. The invention also provides a natural rubber flexible long chain extension modification method based on end group functionalization, which comprises the following steps: pretreating an alpha end group and / or an omega end group of natural rubber, and introducing a hydroxyl or carboxyl active group; and reacting the functionalized natural rubber with a flexible long-chain chain extender at 60-80 DEG C to realize extension and crosslinking of a molecular chain. According to the invention, the flexible long-chain chain extender is introduced, and a flexible buffer section is embedded between natural rubber molecular chains, so that the dynamic stress is effectively dispersed, and the inherent defects of the traditional rigid small-molecule chain extender are overcome.