31results about How to "Reduce cold flow" patented technology

Apparatus, including a diaphragm valve, is provided featuring a valve body, a diaphragm, a pressure ring, and at least one elastomeric member. The valve body may include a circumferential flange. The diaphragm may include a circumferential gasket portion configured to be seated on the circumferential flange so as to form a joint between the valve body and the diaphragm. The pressure ring may include concentric fluctuations, and may be configured to apply a sealing force against the joint so that the concentric fluctuations prevent radial movement of the circumferential gasket portion and the circumferential flange. The elastomeric member may be configured to respond to a compressive force and provide a substantially constant sealing force, transmitted through the pressure ring, regardless of small variations in the thickness or material dimensions of the circumferential gasket portion caused by temperature fluctuation or material flow and age.

The invention provides a preparation method of an insulating material for electrical equipment. The method comprises the following steps: a, leading waste rubber, epoxy resin and silicone rubber intoan internal mixer, performing banburying on the material till the mixture is molten, then sequentially adding a fire retardant, nanosilicon dioxide and carbon black, and reducing the temperature for banburying, so as to obtain a mixture I; mixing and putting a processing auxiliary material, polyimide, sodium alginate, lignin and an antioxidant into a mixer, heating, and performing ultrasonic oscillation, so as to obtain a mixture II; c, adding silicone oil and a coupling agent into the mixture II, putting the mixture II into a stirrer to perform stirring, then putting the mixture II in a vacuum environment, and performing defoaming treatment, so as to obtain a mixture III; and d. uniformly mixing the mixture I, the mixture III, organic tin and a curing agent, leading the mixture into a single screw to perform extrusion, adding the mixture into a dehydrator to perform dehydration, and putting the mixture into a closed container, leaving the mixture to stand, curing, and forming. The method is simple, short in preparation flow, mainly adopts a waste rubber material, and has certain environmental protection significance.

The invention relates to a functionalized diene elastomer composed:

• • a) of a diene elastomer functionalized, at the chain end or in the middle of the chain, by a tin functional group, exhibiting a monomodal distribution of molecular weights before functionalization and a polydispersity index before functionalization of less than or equal to 1.3,
  • b) of a diene elastomer star-branched with a tin compound, exhibiting a monomodal distribution of molecular weights before star-branching and a polydispersity index before star-branching of less than or equal to 1.3, and
  • c) of a content of less than 15% by weight, with respect to the total weight of the functionalized diene elastomer, of a non-tin-functional diene elastomer,
  • the said diene elastomers a), b) and c) being, before optional functionalization or optional star-branching, the same in nature.

The invention relates to a preparation method of liquid polybutadiene with wide molecular weight distribution, which comprises the following steps: adopting organic lithium as an initiator, adding a polarity regulator and a solvent, adding butadiene and organic lithium in batches to carry out anionic polymerization reaction, after the organic lithium is completely added, continuously adding the residual butadiene into a reaction kettle to carry out reaction, and after the polymerization is finished, cooling to room temperature to obtain the liquid polybutadiene with wide molecular weight distribution. Adding a terminator to terminate the reaction; the butadiene and the organic lithium are fed in batches, the single-time feeding amount of the butadiene is 2-10% of the total mass of the butadiene, the single-time feeding amount of the organic lithium is 5-15% of the total mass of the organic lithium, the adding frequency of the organic lithium is 8-20, and the next-time feeding of the butadiene and the organic lithium is carried out after the butadiene added in the previous time completely reacts. The reaction conditions are mild, the molecular weight distribution of polybutadiene can be regulated and controlled by changing the feeding times and the single feeding amount of the initiator to obtain uniform single-peak width distribution, and the prepared product has good mechanical properties and processability.

The invention relates to the field of insulation materials, in particular to a silane crosslinked polyethylene insulation material for electric wires and cables. A method for preparing the silane crosslinked polyethylene insulation material for electric wires and cables by a two-step way mainly comprises two steps of 1, preparation of a catalyst master batch; 2, preparation of a finished product. The insulation material is prepared from the following components of LLDPE (linear low density polyethylene)-7042, LDPE (low density polyethylene), a silane coupling agent, a crosslinking agent DCP, an antioxidant 300 and the catalyst master batch; the catalyst master batch comprises the following components of LLDPE-7042, LLDPE-8320, PP (polypropylene), an antioxidant DLTP, an antioxidant 1024, organic tin and a fluororubber master batch. The insulation material has the advantages that the insulation material is mainly used for insulation layers of cables, and is mainly used for replacing the existing PVC (polyvinyl chloride) material; the insulation property is better than the insulation property of PVC, and the poisonous and harmful gas will be released by the PVC when the electric wire is aged and catches a fire, but the silane insulation material has no poison and harm.

The invention relates to a railway car truck incorporating an interconnection between a side frame and a bearing adapter. The bearing adapter may receive a reduced coefficient of friction surface member in a recess on a top surface of the bearing adapter, facilitating a reduced lateral spring rate of the wheelset. Alternatively, or in combination, an adapter plate is received in the pedestal jaw on the bearing adapter to retain the reduced coefficient of friction surface member above or below the adapter plate. The adapter plate may be provided with surfaces about perpendicular to the longitudinal and lateral axes of the side frame to support elastomeric members, which may provide different longitudinal and lateral spring rates in response to a load applied to the truck.

The invention relates to the field of insulation materials, in particular to a silane cross-linked polyethylene insulation material for 10 kV and below black wires and cables, and a preparation method thereof. The insulation material is prepared by the following components in percentage by weight: LLDPE-7042, LLDPE-8320, LDPE, EVA, PP, a silane coupling agent, a crosslinking agent DCP, an antioxidant 300, an antioxidant 1010, an antioxidant DLTP, an antioxidant 1024, organic tin, a fluorine rubber masterbatch and a black masterbatch. The material is mainly used in an insulation layer of the cable to replace the current main PVC materials, and is better than PVC in insulation property, PVC emits toxic and harmful gases when the wires fire due to aging, and the silane insulation material is non-toxic and harmless.

The invention relates to the field of insulating materials, particularly a silver gray silane crosslinked polyethylene insulating material for wires and cables. The method for preparing a silver gray silane crosslinked polyethylene insulating material for wires and cables by a one-step process mainly comprises the following two steps: 1. preparing a catalyst master batch; and 2. preparing the finished product. The insulating material is prepared from LLDPE-7042 (linear low-density polyethylene 7042), LDPE (low-density polyethylene), a silane coupling agent, a crosslinking agent DCP, an antioxidant 300 and the catalyst master batch. The catalyst master batch is composed of LLDPE-7042, LLDPE-8320, PP (polypropylene), an antioxidant 1010, an antioxidant DLTP (dilauryl thiodipropionate), an antioxidant 1024, organic tin, a fluororubber master batch, a silver gray master batch and an ultraviolet absorbent. The material is mainly used as an insulation layer of the cable to mainly substitute the existing PVC (polyvinyl chloride) material, and has better insulating properties than PVC. The PVC can emit toxic harmful gas when the wire is aged or catches fire, but the silane insulating material does not have toxicity or harm.

The invention relates to the field of insulating materials, in particular to an insulating material for a black overhead insulated cable and a preparation method of the insulating material. The insulating material for the black overhead insulated cable is prepared from the following components in percentage by weight: LLDPE-7020, LLDPE-8320, LDPE, a silane coupling agent, a cross-linking agent DCP, an antioxidant 300, an antioxidant 1010, an antioxidant DLTP, organic tin, fluorine rubber masterbatches and black masterbatches. The insulating material provided by the invention is used for an overhead electric wire for transmitting electricity, and has the insulating property better than that of PVC, while the PVC releases toxic and harmful gases when the electric wire causes a fire by aging and the like, and the silane insulating material is nontoxic and harmless.

The invention relates to the field of insulation materials, and especially relates to an insulation material for silver-gray aerial insulated cables. A two-step preparation method of the insulation material mainly comprises two steps: step one, preparing catalyst master batch, and step two, preparing finished products. The insulation material is prepared from the following components in percentage by weight: LLDPE-7042, LLDPE-8320, LDPE, a silane coupling agent, a crosslinking agent DCP, an antioxidant 300, an antioxidant 1010, an antioxidant DLTP, organic tin, fluorine rubber master batch, silver-grey master batch, and a UV absorbent. The provided insulation material is used to produce aerial insulated cables for power transmission, the insulation performance of the insulation material is better than that of PVC; when a wire is burned due to aging, PVC will give off toxic and harmful gas, while the silane insulation material is nontoxic and harmless.

The invention relates to the field of insulating materials, in particular to a silane crosslinking polyethylene insulating material for 10 kV or below silver gray wires and cables. A method for preparing the silane crosslinking polyethylene insulating material for the 10 kV or below silver gray wires and cables through a two-step method mainly comprises the two steps of catalyst master batch preparation and finished product preparation. The insulating material is prepared from, by weight, LLDPE-7042, LLDPE-8320, LDPE, EVA, PP, a silane coupling agent, a cross-linking agent DCP, an antioxidant 300, an antioxidant 1010, an antioxidant DLTP, an antioxidant 1024, organotin, fluororubber master batches, an ultraviolet light absorber and silver gray master batches. The insulating material is mainly used for insulating layers of the cables and mainly replaces a current PVC material, the insulating property is superior to that of PVC, PVC can emit toxic and harmful gases when the wires fire due to aging and the like, but the silane insulating material is poisonless and harmless.

The invention relates to the field of insulating materials, in particular to an insulating material for black aerial insulated cables. A method for preparing the insulating material for the black aerial insulated cables through one step mainly comprises the two steps of catalyst master batch preparation and finished product preparation. The insulating material is prepared from, by weight, LLDPE-7042, LLDPE-8320, LDPE, a silane coupling agent, a cross-linking agent DCP, an antioxidant 300, an antioxidant 1010, an antioxidant DLTP, organotin, fluororubber master batches and black master batches. The insulating material is used for erecting overhead wires to transmit electricity, the insulating property is superior to that of PVC, PVC can emit toxic and harmful gases when the wires fire due to aging and the like, but the silane insulating material is poisonless and harmless.