14600 results about "Vulcanization" patented technology

A tire or tire tread incorporating an elastomeric composition having improved vulcanization kinetics, based on at least a diene elastomer, a reinforcing inorganic filler and, as (inorganic filler/elastomer) coupling agent, a bis-alkoxysilane tetrasulfide of the formula:

in which:

• • the symbols R¹, which may be identical or different, each represent a monovalent hydrocarbon group selected from among the group consisting of alkyls, whether straight-chain or branched, having from 1 to 4 carbon atoms, and alkoxyalkyls, whether straight-chain or branched, having from 2 to 8 carbon atoms;
  • R² and R³, which may be identical or different, each represent a monovalent hydrocarbon group selected from among the group consisting of alkyls, whether straight-chain or branched, having from 1 to 6 carbon atoms, and the phenyl radical; and
  • x is between about 3 and about 5.

The invention relates to a preparation method of a polymer/graphene composite material through in situ reduction, which is characterized by comprising the following steps: adopting ultrasonic wave or grinding to evenly disperse the graphite oxide prepared by a Hummers method into polymer dispersion; introducing reducing agent into the polymer dispersion for in situ reduction, enabling the graphite oxide to be reduced into the grapheme so as to obtain stable polymer/graphene composite emulsion; carrying out demulsification, agglomeration and drying to obtain the composite polymer/grapheme composite master batch; adding the dried polymer/grapheme composite master batch and various assistants into the polymeric matrix according to a certain ratio; and carrying out double-roller mixing, vulcanization, melt extrusion or injection molding to obtain the polymer/graphene composite material with excellent physical and mechanical properties.

The instant invention provides a method for improving the miscibility of the lower molecular weight unsaturated siloxane-polyether copolymers with the alpha , omega -divinylpolysiloxanes without loss of storage stability, or delay of cure at the vulcanization temperature, or loss of permanent hydrophilicity or other desirable features of the cured polysiloxane. The compositions of the present invention comprise one or more alpha , omega -divinylpolysiloxanes, unsaturated polysiloxane-polyether copolymers having from 2 to 5 silicon atoms per molecule which are preferably trisiloxanes, and a compatibilizing additive. The permanently hydrophilic, rapidly wettable polysiloxane compositions yield static water contact angles <50 DEG dynamic advancing contact angles of less than about 100.

A thermoplastic elastomer composition which, when used for the inner tube and/or outer cover of a hose, can improve the hose flexibility at an ordinary temperature and low temperature, oil resistance, and cold resistance and can reduce the production costs since it does not require a vulcanization step and a hose having said properties using this elastomer composition for its inner tube and/or outer cover and a process and apparatus for the production thereof.

The invention discloses a method for comprehensively recycling valuable metals from a spent lithium ion battery. The method comprises the following steps: carrying out electric discharge treatment on a spent battery, crushing, pre-roasting at 300-400 DEG C, adding a reducing agent, and carrying out reduction roasting at 450-700 DEG C; carrying out water extraction and evaporative crystallization on fine aggregates obtained through the reduction roasting, so as to obtain a high-purity lithium product, leaching copper, nickel and cobalt from leached slag and roasted lump materials by virtue of ammonia oxide, carrying out magnetic separation and sieving on ammonia leaching slag so as to obtain iron and aluminum enriched products, and carrying out reduction acid leaching, purification and edulcoration on sieved products, so as to obtain a high-purity manganese sulfate solution; and carrying out extraction and selective reverse extraction on ammonia leaching liquid, so as to obtain a high-purity nickel sulfate solution and a high-purity copper sulfate solution, and carrying out vulcanization cobalt precipitation, oxidation acid leaching and extraction purification on raffinate, so as to obtain a high-purity cobalt sulfate solution. The method is high in extraction rate of valuable metals and applicable to the treatment of multiple waste lithium ion battery raw materials and efficient utilization of multiple elements, and sorting is not required.

A wheel support bearing assembly includes inner and outer members (1 and 2) and at least one row of rolling elements (3) operatively interposed between the inner and outer members (1 and 2) and an annular sealing device (5) sealing an open end of an annular space defined between the inner and outer members (1 and 2). The sealing device (5) includes first and second annular sealing plates (11 and 12) fitted to different members out of the inner and outer members (1 and 2). Each of the first and second sealing plates (11 and 12) includes a generally cylindrical wall (11a or 12a) and a radial wall (11b or 12b) assembled together to represent a generally L-shaped section. The first sealing plate (11) is fitted to one of the inner and outer members (1 and 2) that serves as a rotating member. An elastic member (14) mixed with a powdered magnetic material is bonded by vulcanization to the radial wall (11b) of the first sealing plate (11). A protective cover (18) made of a non-magnetic material is positioned on one side adjacent an exterior of the multi-pole magnet (14) with a predetermined air gap left therebetween that the number of revolution can be detected through the protective cover (18).

The invention provides an oxidized grapheme/carbon black rubber nanocomposite and preparation method thereof, which belongs to the field of rubber nanocomposite technology. The nanocomposite comprises the following basic compositions by mass: 100 parts of diene series rubber matrix, 0.5-5 parts of oxidized grapheme, 30-70 parts of hard carbon black of average particle size 11-30nm, 1-10 parts of plasticizer, 6-10 parts of activator, 0.5-4 parts of anti-aging agent, 1-4 parts of sulfuration promoter and 1-6 parts of insoluble sulphur; oxidized grapheme modifier. The oxidized grapheme powder is dispersed in deionized water for ultrasound, and a natural rubber emulsion is added, and masterbatch after flocculation, washing and drying is mixed uniformly with other additives, after sulfuration, the product is obtained. The oxidized grapheme/carbon black rubber nanocomposite has the advantages of excellent processing performance and obviously reduced dynamic themogenesis, thereby improving the usage life of tyre.

The present invention provides a solid golf ball having excellent shot feel at the time of hitting and excellent controllability at approach shot, while keeping the characteristics inherent to the solid golf ball, i.e. excellent flight performance. The present invention related to a solid golf ball comprising a core and a cover formed on the core, wherein the core is obtained by vulcanizing a rubber composition comprising a base rubber, a co-crosslinking agent, a vulcanization initiator and a filler, a calculated volume content of the co-crosslinking agent is 10.0 to 16.0% by volume, a total calculated volume content of the base rubber and the co-crosslinking agent is 96.2 to 98.0% by volume, based on the total rubber composition for the core, and the cover has a Shore D hardness of 50 to 67.

The invention discloses a high-heat-conductivity rubber composite material and a preparation method of the high-heat-conductivity rubber composite material. The high-heat-conductivity rubber composite material consists of the following ingredients in parts by mass: 100 of rubber, 4 to 6 of zinc oxide, 1 to 3 of stearic acid, 1 to 2 of anti-aging agents, 40 to 60 of carbon black, 1 to 1.5 of promoters, 1 to 3 of sulphur and 50 to 170 of heat conducting agents. The manufacture method comprises the following process steps that: the rubber is added into an open mill, the zinc oxide, the stearic acid, the anti-aging agents, the promoters, the carbon black and the heat conducting agents are sequentially added after the roll recovering, and finally, the sulphur is added. After rubber materials are uniformly mixed, the thin conduction is carried out, triangle bag packing and rolling are respectively carried out for five times, and the roll distance is regulated to 1.5mm for sheet output. The material sheets are placed into a mold, the vulcanization is carried out on a flat plate vulcanization machine, the vulcanization time is 15 to 20 minutes, the vulcanization temperature is 160 to 165 DEG C, and the vulcanization pressure is 10 to 12MPa. The material disclosed by the invention has an excellent physical and mechanical property and a high heat conduction factor.

The invention provides a method for preparing a hydrogenation catalyst. Active components are introduced by a two-stage method; previously introduced metal components have strong action with a carrier through a roasting step, and subsequently introduced active components have no roasting step and have weak action with the carrier; and during vulcanization and usage of the catalyst, the active metal components having strong action with the carrier can inhibit migration and concentration of the active metals having weak action with the carrier, so the catalyst keeps ideal activity and stability. The catalyst prepared by the method can be used in a hydrotreating process of various distillate oils.

The invention relates to a high anti-tearing and high temperature vulcanized silicon rubber, which is made through mixing and vulcanization of peroxide vulcanization agent and a combination which uses methylvinyl silicone rubber as base adhesive. The combination, according to weight proportion, comprises 100 of methylvinyl silicone rubber with low vinyl content, 1 to 30 of hydroxyl silicone oil, 0.1 to 3 of inner mold release agent, 15 to 80 of reinforcement agent, 1 to 10 of methylvinyl silicone rubber with high vinyl content and 1 to 10 of hydrogen-containing silicone oil; wherein, the vinyl molar content of the low vinyl-content methyvinyl silicone rubber is 0.01 percent to 0.15 percent; the vinyl molar content of the high vinyl-content methylvinyl silicone rubber is 1 percent to 10 percent. The invention has the advantages that the high vinyl-content methylvinyl silicon rubber is added into the methylvinyl silicone rubber, leading unsymmetrical concentration-crosslinking or one place multiple crosslinking to be formed during sulfuration period and the silicone rubber to generate so large resistance at the place that the rubber is difficult to be torn. In addition, the broken and tensile strength of vulcanized silicon rubber products is up to 8.5 MPa, and the tear strength is up to 45 N/mm.

A refractory conveying belt is prepared from the dibasic ethylene propylene rubber, or dibasic ethylene propylene rubber and ternary ethylene propylene rubber through pre-pugging, adding heat conducting agent and anti-ageing agent, pugging, adding reinforcing agent, softening agent and short aramid fibers, pugging, adding cross-linking agent and cross-linking aid, heating, calendering to become sheet, attaching it onto tension-resistant canvas, rolling and sulfurizing.

The invention relates to the field of heat-conducting high-polymer composite materials, particularly a graphene-containing silicon rubber heat-conducting composite material and a preparation method thereof. The heat-conducting composite material is mainly composed of graphene, an inorganic heat-conducting filler and a silicon rubber matrix, wherein the graphene accounts for 0.1-10 wt% of the silicon rubber heat-conducting composite material, and the graphene constitutes a heat-conducting network in the heat-conducting composite material. The method comprises the following steps: uniformly compounding the inorganic heat-conducting filler, graphene, crosslinking agent and other assistants and silicon rubber on a double-roll open mill to obtain a heat-conducting silicon rubber prepolymer; and carrying out primary vulcanization on the prepolymer on a flat vulcanizing machine, and carrying out secondary vulcanization in a drying oven to finally obtain the composite heat-conducting silicon rubber. Since the two-dimensional graphene has large thickness-diameter ratio and can easily constitute an effective heat-conducting network in the silicon rubber, a small amount of two-dimensional graphene can obviously enhance the heat-conducting property of the silicon rubber (the heat conductivity coefficient at 40 DEG C is 4.98 W/m.K). The silicon rubber composite heat-conducting material can be widely used in the field of heat dissipation of electronic products.

A rubber composition for a tire tread, or a pneumatic tire using the same in a tire tread portion, wherein the tread portion contains a diene rubber; and carbon black and/or silica; and a gas-encapsulated thermoplastic resin and, further, a short fiber, a hard particle and/or a liquid polymer, and wherein the gas-encapsulated thermoplastic resin particle is obtained by expanding, upon heating. at a temperature of an expansion starting temperature thereof or more, prior to vulcanization of a rubber, a thermally expansible thermoplastic resin particle, which comprises a thermoplastic resin having an expansion starting temperature of from 70° C. to less than 120° C. and having a heat resistance to withstand vulcanization of rubber, followed by vulcanization to uniformly disperse the gas-encapsulated thermoplastic resin in the rubber, or a short fiber, a hard particle and/or a liquid polymer is further compounded to give a high frictional force on ice.

The invention provides a sulfur vulcanizable silica-reinforced elastomeric compound having improved tensile mechanical and dynamic viscoelastic properties. The compounds are formed by mixing an elastomer optionally having an alkoxysilane terminal group, with silica in the presence of an alkyl alkoxysilane and a blocked mercaptosilane. In particular, the mercaptosilane moiety of the blocked mercaptosilane and the alkyl alkoxysilane are present in a weight ratio of about 0.001:1 to about 0.20:1. Preferably, the blocked mercaptosilane and the alkyl alkoxysilane are compounded with the elastomer and the silica at high temperature to facilitate the silica-silane reaction. A deblocking agent is added at any desired mixing stage, optionally with the cure package, to allow binding of the mercaptosilane to the polymer.

Compositions are disclosed which comprise mixtures of at least one compound selected from silicone elastomers, bis-, tri- or higher polymaleimides and/or bis-, tri- or higher polycitraconimides, and at least one compound selected from p-phenylene-diamine based antiozonants, sulfur compounds capable of accelerating sulfur vulcanization of polymers capable of being crosslinked by sulfur and polysulfide polymers which when compounded into polymers curable by free radical initiators in the presence of free radical initiators permit substantially tack free surface cure of the polymers by decomposition of the free radical initiator in the presence of molecular oxygen. Compositions containing the above ingredients and at least one free radical initiator, curable compositions containing the combination and processes for making and using the compositions are also disclosed.

A surgical simulator is disclosed herein. The surgical simulator includes an artificial organ and an enclosure substantially enclosing the artificial organ. The artificial organ is substantially formed of platinum cured room temperature vulcanization silicone rubber (“PCRTVS”).

The invention discloses a sneaker sole material with high wear resistance and low hardness and a preparation method thereof, particularly a method for preparing a sneaker sole material which is suitable for middle and high-grade sneaker soles with higher requirements on wear resistance and comfort. The sneaker sole material comprises the following components: butadiene rubber (BR), natural rubber (NR), styrene butadiene rubber (SBR), softening oil, a reinforcing agent, an activating agent, a coupling agent, a vulcanizer, a vulcanization accelerator, a tackifier and an anti-aging agent. A series of sole material with high wear resistance (DIN abrasion is less than or equal to 40mm<3>, and the length of grinding marks is 3.0 to 4.0mm) and low hardness (ShoreA 60-66) is prepared by screening the proportion of rubber composition, the coupling agent, the accelerator, and the activating agent and reasonably controlling a process on the basis of the rubber, the softening oil and the reinforcing agent. The material has the advantages that: (1) the total weight of a sneaker sole is expected to be reduced, namely the thickness of a rubber outer sole of a sneaker can be reduced under the condition that the material has the wearing life which is the same as that of the conventional sneaker sole, so that the total weight of the sole is reduced; (2) the humidity and slip resistance is improved, namely the hardness of the sole is lower and the sole is easy to distort under the condition of stress, so that the contact area of the sole and the ground is increased, and the aim of improving the humidity and slip resistance of the sole is fulfilled; and (3) the comfort is improved.

The invention relates to a method for preparing a vulcanized hydrogenation catalyst. A catalyst carrier adopts an impregnation method to load hydrogenation metal components; before, after or simultaneously loading the hydrogenation metal components, a vulcanizing agent is introduced, and the use level of the vulcanizing agent is 85 to 150 percent of theoretic sulfur demand of the hydrogenation metal components; and during loading the hydrogenation metal components and introducing the vulcanizing agent, the method comprises at least one step of low-temperature thermal treatment but does not comprise a roasting step. The method overcomes the defects that the conventional oxidation catalyst has high preparation cost, long vulcanizing time and high operating cost. The catalyst prepared by the method is suitable for a hydrogenation process of petroleum fractions, and the hydrogenation activity of the catalyst prepared by the method can reach or exceeds the effect of the conventional catalyst.

The invention discloses tread rubber for a large project tire and the large project tire using the tread rubber. The tread rubber for the large project tire consists of (A) tread cap rubber, (B) tread center rubber and (C) tread base rubber. On one hand, the invention adopts rubber matrixes with three different formulas to well solve the problem that an outer layer is easy to overcure if the tread rubber for the large project tire is thick; and on the other hand, the tread rubber prepared by the three formulas of the rubber matrixes can obtain superior equilibrium between abrasion resistance, heat resistance, tear resistance, low heat generation and curing speed.

The invention discloses a preparation method of a mixed filling type thermal conductive silicone rubber composite. Raw materials comprises the following components, by mass, 100 parts of raw silicone rubber, 10 parts of white carbon black, 1 to 3 parts of hydroxy silicone oil, 100 to 200 parts of a thermal conductive filler, 2 to 4 parts of a silane coupling agent and 2 parts of a di-2,5-vulanizator. The preparation method comprises the following steps: adding raw silicone rubber to a double roller mill; adding white carbon black, the thermal conductive filler, the silane coupling agent and hydroxy silicone oil according to a formula design after roller packaging; adding a peroxide vulcanizer after repeatedly and uniformly mixing; mixing uniformly to obtain mixed silicone rubber; putting in a die and carrying out first-stage vulcanization after cold pressing mold filling; and putting a molded sample in an air blasting drier and carrying out second-stage vulcanization to obtain a finished product. In the present invention, mixed particles of SiC and AlN are employed to fill high temperature vulcanized silicon rubber, effective thermal conductive net chains are formed in silicone rubber matrixes, so the obtained heat-conducting silicone rubber composite material has a good heat conducting performance.