222results about How to "Excellent thermodynamic properties" patented technology

A heat exchanger uses a refrigerant acting under a high pressure, such as carbon dioxide, as a refrigerant. The heat exchanger includes first (10) and second (20) header pipes arranged a predetermined distance from each other and parallel to each other, each having at least two chambers (12,14,22,24) independently sectioned by a partition wall, a plurality of tubes (50) for separately connecting the chambers of the first (10) and second (20) header pipes, facing each other, wherein the tubes (50) are divided into at least two tube groups (51,52), each having a single refrigerant path, a refrigerant inlet pipe (30) formed at the chamber disposed at one end portion of the first header pipe (10), through which the refrigerant is supplied, a plurality of return holes (29) formed in the partition wall to connect two chambers adjacent to each other, through which the refrigerant sequentially flows the tube groups (51,52), and a refrigerant outlet pipe (40) formed at the chamber of one of the first and second header pipes connected to a final tube group of the tube groups along the flow of the refrigerant, through which the refrigerant is exhausted.

An improved method for manufacturing tube and fin heat exchangers that, according to a preferred embodiment, includes a process for increasing the stiffness and rigidity of heat exchanger fins. Stiffer fins have a greater tendency to maintain proper alignment within a stack of fins, which aids in lacing long stacks of fins with small (e.g., 5 mm) diameter tubing. Preferably, fin stiffness is increased by forming a plurality of longitudinal ribs within the fin during the fin stamping process. More preferably still, two ribs for each longitudinal row of collared holes are provided. The preferred embodiment also includes a slotted heat exchanger fin that is dimensioned and arranged for optimized thermodynamic performance when used with small diameter tubing, thus reducing the space required for a given heat exchanger system.

A method for removing hydrogen sulphide (H₂S) from a natural gas stream comprising methane (CH₄) and H₂S comprises:—cooling the natural gas stream in a heat exchanger assembly (13,16,18);—feeding at least part of the cooled natural gas stream through a feed conduit (19,21) into a cyclonic expansion and separation device (1) in which the cooled natural gas stream is expanded in a nozzle (4) and thereby further cooled to a temperature and pressure below the dew point of H₂S and is separated by inducing the cooled natural gas stream to swirl in a tubular separation chamber (9) thereby inducing centrifugal forces to separate the cooled natural gas stream into a cooled low density fluid fraction, which is H₂S depleted and methane enriched, and a cooled high density fluid fraction, which is H₂S enriched and methane depleted;—feeding the cooled low density fluid fraction to a product gas conduit (33) which is connected to the heat exchanger assembly (14) for cooling the natural gas stream fed to the cyclonic expansion and separation device (1); and—feeding the cooled high density fluid fraction to a fractionating column (8) for further separation.

The invention relates to an expansive type fire retardant, a flame retardation polymer composition containing the fire retardant and a fiber enhanced polymer-based flame retardation composite material prepared by the flame retardation polymer composition. The expansive type fire retardant comprises a carbon source, an acid source, a gas source and an anti-oxidant which contains dis(octadecyl)pentaerythritol diphosphite and/or hexadecyl pentaerythritol diphosphite. The composite material comprises the flame retardation polymeric material body and the continuous fiber positioned in the flame retardation polymeric material body, the flame retardation polymeric material body and the continuous fiber are integrated, the flame retardation polymeric material body can be obtained by solidifying the flame retardation polymer composition containing the fire retardant, and the prepared fiber enhanced polymer-based flame retardation composite material has excellent thermodynamics performance after being burned.

The invention provides a ceramic surface material. The ceramic surface material comprises 20.0wt%-70.0wt% of organosilicone, 20.0wt%-70.0wt% of an organic solvent, 10wt%-50wt% of filler and 0.1wt%-3.0wt% of an auxiliary, wherein the organic solvent is selected from one or more of butyl acetate, dimethylbenzene, n-butyl ether, butyl carbitol acetate, hexahydrotoluene, normal octane and butyl titanate; and the filler consists of graphene, graphite, transition group metallic oxide, composite silicate, rare earth oxide, nonmetal and metal. The components in the ceramic surface material cooperatively interact, and the ceramic surface material has good overall performance when used as a coating.

The invention provides a manufacture method of a biodegradable non-woven material, which is characterized in that the method comprises the following steps: slicing and drying polyethylene succinate-co-p-benzene dicarboxylic acid butanediol ester; heating and fusing polymer slices in a screw rod extruding press; extruding fused mass from spinneret holes of a mold head; using high-pressure air flow for spraying and blowing at both sides of the spinneret holes when the fused mass is extruded from the spinneret holes of the mold head; tensioning the fused mass into superfine fiber; receiving the superfine fiber through a receiving roller; and forming a biodegradable PBST fused spraying non-woven material through the self adhesive effect of the superfine fiber. The non-woven material manufactured by the method of the invention has good thermodynamic performance, fine fiber diameter, good ventilation performance, soft hand feeling and the like, and also has excellent biodegrading capability. The product can be used in the fields of filtering materials, sanitation materials, package materials and the like, and belongs to a product with good development prospects and high added value.

The invention relates to a preparation method of a polymethacrylimide foam material with obviously improved thermodynamic performance. The invention is characterized in that the polymerization product used for the polymethacrylimide foam material is added with 0.05wt percent to 5wt percent of olefinic unsaturated compound capable of free radical polymerization and with at least two double bonds and 1wt percent to 5wt percent magnesia. The invention also relates to the polymethacrylimide foam material with anti-thermal-distortion larger than 250 DEG C, and the usage of polymethacrylimide foam material in preparing interlayer component.

The present invention relates to a process for preparing a semi-aromatic polyamideimide, and also to a polyamideimide and to a composition based on a thermoplastic matrix, comprising a polyamideimide. The invention relates more particularly to a process for preparing a polyamideimide by melt polymerization of at least one organic compound having carboxyl groups, of at least one diamine compound and optionally at least one diacid compound.

The invention discloses a high-molecular-weight polyester plastic based on 2,3-butanediol. The polyester plastic has a repetition structure unit shown in the formula, wherein R1 is defined in the specification, p is 0-11, R2 is defined in the specification, R3 is defined in the specification, n is 1-1000, and m is 1-1000. The invention further discloses a preparation method for the high-molecular-weight polyester plastic based on 2,3-butanediol. The polyester plastic is a transparent polyester plastic due to the existence of the side-chain methyl of 2,3-butanediol, as well as is high in molecular weight, excellent in mechanical property, and wide in application prospect in the aspects of injection-moulded parts, optical devices, thin films, laminated materials and the like.

The invention discloses an isoindole nitrogen oxide free radical modified polypyrrole and a preparation method and an application thereof. 3- and 4-site side groups in pyrrole repeating structural units of a polypyrrole high molecular material are chemically modified by an isoindole nitrogen oxide free radical derivative to obtain the product. Or 3- and 4-site side groups of pyrrole monomers are chemically modified by the isoindole nitrogen oxide free radical derivative, and then a polymerization reaction is carried out to obtain the product. Compared with polypyrrole, the modified polypyrrole has better electrical conductivity, higher charge storage density, better capacitance retention rate, fast electrode reaction dynamics performance, and oxidation-reduction ability and characteristic three-line electron paramagnetic resonance spectra similar to isoindole free radicals; the polymer has good rate capability and cycle stability in the processes of charging and discharging; and after 500-cycle charging and discharging circulation, the coulomb efficiency can be still kept at 95% or more, and the modified polypyrrole is expected to become a novel high-capacity and high-power battery material.

The invention relates to a process for preparing 3,3',5,5'-tetramethyl-4,4'-biphenyl didycidyl ether, wherein the 3,3',5,5'-tetramethyl-4,4'-biphenol is reacted with excess epichlorohydrin under the action of phase transition catalyst. The prepared has low epoxy equivalent weight, high yield, and simple reaction steps.

The invention relates to a method for manufacturing carbon-metlbond lamination retaining frame materials for rolling bearings, which comprises the steps that carbon fiber cloth is used as a substrate, prepared phenolic resin is used as a bonding body, and the carbon-metlbond lamination retaining frame materials are obtained through phenolic resin dipping of the carbon fiber cloth, hot pressing coiling formation and post curing. The carbon-metlbond lamination retaining frame materials have a higher heat conductivity coefficient and a lower thermal expansion coefficient, through detection, the use temperature reaches 150 to 220 DEG C, the heat conductivity coefficient is greater than or equal to 0.85 (W/m-K), the thermal expansion coefficient is smaller than or equal to 1.0*(10<-6>/DEG C), the tensile strength is greater than or equal to 150 Mpa, and the elastic modulus is greater than or equal to 50Gpa. The performance parameter is improved or reduced, so the retaining frame manufactured by the carbon-metlbond lamination materials can meet the use requirement of a rolling bearing at a high temperature and a high speed.

Invention this person who involves high polymer contain 8-hydroxyl quinoline metal cooperate with polymer of thing give light the material and make France and use, organic/the high polymer and electricity send and give out light materials there is extensive application in the field of photoelectron. At present it is the organic/last shortcoming exist high plymer, it is prepare there aren't performance the good electricities not to make its unable. Last heavy luminescence material invention, 8 among material-cooperate with hydroxyl quinoline metal the contents high polymer 1-30% of weight for thing. This material from one kin alkenes been the single with containin by 8-hydroxyl quinoline mix alkenes of body the single and through free radical tool formate not lasting 8 first-hydroxyl quinoline mix High polymer, lie in it is to reserve vacancy since have 8-metal cooperate with thing of through cooperating not turning into not for 8ing-hydroxyl quinoline metal cooperate with high polymer of thing of at quinoline hydroxyl. Have craft to be simple, equipment with little investment aveantage. Will give out light material can use as organic/high polymer electricity is it give out light level show electricity of device is it give out light material and electron transmit materials to send.

The invention provides a resin composition, which contains the following constituents in part by weight: 100 parts of polrvinyl chloride resin, 3 to 50 parts of ABS resin and 3 to 30 parts of composite compatilizer which are blended, wherein the composite compatilizer consists of a thermoplastic elastomer graft and chlorinated polyethylene; the thermoplastic elastomer graft is the graft of styrene-butadiene-styrene block copolymer or styrene-pentadiene-styrene block copolymer and a polar monomer; and the mass ratio of the thermoplastic elastomer graft to the chlorinated polyethylene in the composite compatilizer is 10:90 to 60:40. The resin composition has extremely high shock resistance, excellent low temperature resistance, superior stretching resistance, good rigidity and good thermodynamic property. A method for preparing the composition of the invention is simple in process and easy in operation.

The invention provides a ceramic surface material, which is prepared from 20.0 to 70.0 weight percent of organic silicon, 20.0 to 70.0 weight percent of organic solvents, 1.0 to 50 weight percent of filling materials and 0.1 to 3.0 weight percent of auxiliary agents, wherein the organic solvents are selected from one or several kinds of materials from butyl acetate, xylene, n-butyl ether, di-ethylenhje glycol mono butyl ether acetate, methylcyclohexane, normal octane and butyl titanate; the filling materials are prepared from graphene, graphite, transition metal oxide, compound silicate, rareearth oxides, nonmetal, nonmetal compounds, transition metal boride and metal. The ingredients in the ceramic surface material achieve the mutual cooperated effects, so that the better comprehensive performance is realized when the ceramic surface material is used as a coating.

The invention discloses rare earth doped fluorescent powder and a synthetic method thereof and application of the fluorescent powder in LED devices, and belongs to the technical field of luminescent materials. The general chemical formula of the fluorescent powder is MS[2-y]AyO[2+y]N[2-y-4z/3]Cz:Rx. According to the compound, C<4-> is substituted for N<3->, due to the fact that the electronegativity of C is smaller than that of N, the electron cloud expansion effect of the C<4-> is more obvious than that of the N<3->, after doping is conducted, rare earth ion 5d energy level splitting is increased, Stokes shift can change, and fluorescence parameters such as fluorescent peal and full half-peak width of the powder change. By adjusting generation of the above-mentioned doped ions, fluorescent powder with different fluorescent light colors and quantum efficiency can be obtained. The invention further discloses the application of the fluorescent powder in the field of LED devices. The fluorescent powder is applied to white LED light fixtures or light-emitting components which take blue LED or purple LED as a light source and can help to increase the color rendering indexes of the devices.

The invention discloses red mud composite binder for oxidized pellets. The red mud composite binder is prepared by waste red mud of aluminum plants, magnesite stone and humus binder. The red mud composite binder has characteristics of good hydrophily, excellent binding effect, low price, high iron content and the like. The granularity of the red mud composite binder is smaller than 200 meshes, partial weight ratio is larger than or equal to 90%, and water content is smaller than or equal to 1%. Therefore, the red mud composite binder can partially or totally replace bentonite to be used for producing the oxidized pellets. Compared with the technology completely utilizing the bentonite to produce the oxidized pellets, production rates of pellet TFe, sinter TFe and an ironmaking system are all improved, and slag quantity of a blast furnace is reduced. Besides, the content of MgO in the pellets is increased, so that the thermodynamic property of the pellets is good, and operation of the blast furnace is facilitated.

The invention provides a ceramic surface material. The ceramic surface material comprises 20.0-70.0 wt% of organosilicon, 20.0-70.0 wt% of an organic solvent, 1.0-50 wt% of a filler and 0.1-3.0 wt% ofan assistant, wherein the organic solvent is one or more selected from butyl acetate, xylene, n-butyl ether, diethylene glycol butylether acetate, methylcyclohexane, n-octane and butyl titanate; andthe filler is composed of graphene, graphite, transition metal oxide, composite silicate, rare earth oxide, nonmetal, a nonmetallic compound and metal. Components in the ceramic surface material havesynergistic effects, so the ceramic surface material has good comprehensive performances as a coating layer.