69results about How to "Increased tangle" patented technology

A preparation method of a magnesium alloy variable-section cylindrical member by composite extrusion deformation is characterized in that the method comprises the following steps: firstly, orderly performing homogenization pretreatment and hot extrusion deformation of an AZ80 magnesium alloy blank; preparing a variable-section cylindrical force-bearing member by forward and backward composite extrusion; finally performing turning and heat treatment to obtain a magnesium alloy variable-section cylindrical member. Compared with the prior art, the invention has the following advantages that the invention can prepare large-size cylindrical members; the material grain is fine; the mechanical properties are high; and the procedures are simple.

The invention discloses a micrometer/nanometer fiber composite filtering material and a preparation method thereof. The material comprises nanometer fiber and a single-layer micrometer fiber net; andthe structure is as follows: single or bunchy nanometer fiber is distributed on the surface of the single-layer micrometer fiber net uniformly or is embedded in a fiber assembly gap of the single-layer micrometer fiber net uniformly. The method comprises the following steps: preparing electrostatic spinning liquid; preparing the single-layer micrometer fiber net from micron-sized fiber and conveying the single-layer micrometer fiber net to a net conveying curtain with meshes; starting to perform electrostatic spinning by using the electrostatic spinning liquid, jetting single or bunchy nanometer fiber on the single-layer micrometer fiber net uniformly from an electrostatic spinning nozzle to form a single-layer micrometer/nanometer fiber composite net; and forming a continuous multi-layerstructure composite fiber net by using the single-layer micrometer/nanometer fiber composite net by a cross lapping mode, and performing mechanical consolidation to obtain the micrometer/nanometer fiber composite filtering material. The method is simple in production process, high in controllability and easy in industrialization.

The invention provides a polyamide composition and a preparation method thereof. The polyamide composition has high melt strength and is characterized in comprising thermoplastic polyamide resin and a maleic anhydride copolymer. The maleic anhydride copolymer is obtained through alternating copolymerization or block copolymerization of maleic anhydride and one or two monomers comprising alkenyl. The composition provided by the invention has relatively high melt strength and hydrolysis resistance.

The invention belongs to the field of fuel cells, and particularly relates to catalyst slurry for a membrane electrode, a preparation method of the catalyst slurry, a catalyst coating membrane and themembrane electrode. The catalyst slurry for the membrane electrode is prepared from the following components: a catalyst, perfluorosulfonic acid resin, a solvent and an additive, wherein the additiveis a compound or a polymer containing at least two nitrogen-containing functional groups. By using the catalyst slurry and adopting a cathode and anode direct coating method to prepare a catalyst coating film, the catalyst coating film with few cracks can be prepared.

The invention discloses a polyamide composition with good appearance, prepared from, by weight, 49-89% of thermoplastic polyamide resin, 0.01-10% of a maleic anhydride copolymer, 0-50% of a filler, 0-20% of an anti-impact modifier, and 0.01-20% of a polyhydroxy compound, wherein the maleic anhydride copolymer is one of alternating copolymers or block copolymers made by means of mass polymerization. The maleic anhydride copolymer of special structure is added into a polyamide system, so that melt strength and mechanical properties of the polyamide composition are improved; the polyhydroxy compound is introduced, so that the appearance of the polyamide composition is greatly improved, and the mobility worsening due to the introduction of maleic anhydride copolymers is particularly improved;the maleic anhydride copolymer is particularly suitable for processing or forming procedures having high melt strength requirement, especially extrusion molding, blow molding, foaming and the like.

The invention discloses a film with a high drawing ratio. The film is composed of an outer layer, an intermediate layer and an inner layer. The outer layer is a metallocene linear low density polyethylene and ethylene modified polyethylene glycol terephthalate blending modified resin; the intermediate layer comprises the compositions of maleic anhydride grafted low density polyethylene and graphene oxide modified low density polyethylene; and the inner layer is polyamide-11 or polyamide-12. The invention also discloses a production method of the film with the high drawing ratio. Compared withthe prior art, the packaging film has the advantages of high drawing ratio, low cost, good comprehensive performance, strong market competitive strength and the like. The invention also discloses theproduction method of the film with the high drawing ratio.

The invention discloses a method using epoxy resin liquid crystal to modifying nylon performance. The method comprises the following steps: epoxy resin liquid crystal and nylon 66 are uniformly mixed and dried; the blend is added into a Haake rheometer for banburying; after banburying for 8-15 minutes in Haake rheometer at 260-270 DEG C, the material is discharged and cooled at room temperature, and then is stored in sealing bags; the mass of the epoxy resin liquid crystal is 5-10% of that of the mixture; the epoxy resin liquid crystal is blended with a crystal high-molecular material whose main chain contains proton donor or the like, and at a certain temperature, the epoxy resin liquid crystal is introduced into polymer side chain, thereby reducing melting temperature of the polymer itself, and improving processing performance of the material itself. the melting temperature of modified nylon can be reduced to 231.1 DEG C at the lowest, which is 20 DEG C lower than that of the pure nylon 66. The initial decomposition temperature can be increased to 366.1 DEG C at the highest, which is 8 DEG C higher than that of the pure nylon 66.

A electrically conductive polyphenylamine with high solubility, mechanical performance and adhesion is prepared from the hydroxyalkylthio ring substituted phenylamine and the siloxyalkylthio ring substituted phenylamine through copolymerizing under existence of oxidant and long-chain alkylprotonic acid.

The invention discloses a reinforced polypropylene material and a preparation method and application thereof. The reinforced polypropylene material comprises the following components in parts by weight: 20-80 parts of straight-chain polypropylene; 5-40 parts of long-chain branched polypropylene; 0.5-25 part of a compatilizer; 5-60 parts of reinforcing fibers; 1-20 parts of a fluorine compound; the prepared polypropylene material has high melt strength and good rigidity and heat resistance, and is mainly suitable for blow molding, plastic uptake and other occasions.

The invention discloses a high-melt-strength polypropylene material as well as a preparation method and application thereof. The high-melt-strength polypropylene material comprises the components in parts by weight: 10-90 parts of straight-chain polypropylene, 0.5-50 parts of polypropylene with a long branched chain, and 0.01-20 parts of a fluorine compound. Long molecular chains of straight-chain polypropylene are utilized to increase entanglement among the molecular chains, thereby being beneficial to enhancing the stability of the melt during extrusion and plastic uptake; by adding the polypropylene with the long branched chain and utilizing the branched chain structure, the melt strength can be greatly improved; and the fluorine compound is not molten in the forming process, and can be stretched into fibers under the action of the melt, so that the polypropylene molecular chain and the fluorine compound fibers form an interpenetrating network, and the melt strength of the whole material is further improved. The polypropylene material prepared in the method has high melt strength, and is mainly suitable for blow molding, plastic uptake and other occasions.

The invention discloses a completely biodegradable film and a preparation method thereof. The completely biodegradable film is prepared from poly(butylene adipate-co-terephthalate), polyglycolic acid, a chain extender styrene-acrylic acid-glycidyl methacrylate copolymer, a plasticizer poly(succinic acid-1, 2, 4-trimethyl-1, 3-pentanedionate), a plasticizer poly (butylene adipate-co-butylene terephthalate), a plasticizer polysuccinic acid-1, 2-propylene glycol ester, a nucleating agent, a lubricant ethylene bisstearamide and an anti-blocking agent erucyl amide. The preparation method comprises the following steps: weighing the components according to the formula, mechanically mixing to form a premix, metering and adding the plasticizer polysuccinic acid-1, 2-propylene glycol ester from a liquid feeding port of a twin-screw extruder, carrying out melt extrusion, water cooling, pelletizing and drying to obtain special resin for film blowing, and carrying out blow molding film forming through a film blowing machine to obtain the completely biodegradable film. The chain extender, the nucleating agent and the plasticizer can effectively improve the tensile elongation at break and tear strength of the film and obviously improve the rheological behavior of the material, and the film has good mechanical properties and excellent biodegradability and can replace PE, PP, PVC and the like to prepare films and sheets.

The invention discloses a stereo-complex polylactic acid material or product with excellent melt stability and melt processability and a preparation method thereof. A grafting agent, a catalyst, L-polylactic acid and D-polylactic acid are mixed uniformly, then the mixed materials are added into a melting mixer, the mixed materials are blended and granulated, and the granules are melted, processed,and molded to obtain the SC-PLA material or product with excellent melt stability and melt processability. Part of PLA molecular chains are grafted to molecular chains of the grafting agent in-situ by virtue of a reactive blending technology, so that a grafted copolymer with a long branch chain structure is obtained, the melt stability of SC-PLA is effectively improved, and the obtained SC-PLA also has good melt processability. The preparation method is simple, feasible, green and efficient, and large-scale industrial production is easy to realize.

The invention provides a material for a powder 3D printing test model and a preparation method of the material. The material is prepared from the following materials: magnesium phosphate cement, a spreadability adjusting component, a cohesiveness adjusting component and a reinforcing component. The material has the characteristics of good forming strength, high setting speed, high early strength, high printing precision and the like, can greatly improve the problem that the conveying, spraying and building processes of powder and liquid materials in the traditional Portland cement material and powder 3D printing are difficult to adapt, and can be used for manufacturing a cement space bracket structure with good mechanical properties and printing precision; the material meets the requirements of replicability and controllability of a physical test model with a complex structure, effectively combines various mechanism researches with test verification methods, further verifies the reliability of a mechanism theory, and has a better application prospect.

The invention relates to a preparation method of a highly-impermeable rubber concrete material, and belongs to the technical field of concrete materials. A sol material is prepared by using anhydrousaluminum chloride and aluminum powder as aluminum sources and tetraethyl orthosilicate as a silicon source, the surface of a rubber material is coated with the sol material, and the uniform dispersionof the sol material on the surface of the rubber material body forms new entanglement points, so the entanglement of the rubber material and the molecular chain of the surface of the concrete material is enhanced, thereby the tensile strength of the composite material is increased; and coating modification using the sol makes the sol and the rubber material form a good wetting interface, so fibers, a mixture and the rubber material are uniformly dispersed in a matrix; and modification using the sodium hypochlorite composite silica sol and surface oxidation and chlorination using sodium hypochlorite are carried out to realize the surface modification of rubber composite material, so the number of polar groups on the surface is increased, the wettability is improved, the roughness is improved, the mechanical strength of the material is improved, and the impermeability of the material is improved.

The invention discloses a 3D printing system and method for improving interlayer connection strength through irradiation heating. An infrared lamp tube is of an annular structure, and is arranged on a printer nozzle in a sleeve mode through a fixing device, and a semi-crystalline polymer material for printing passes through the center of the infrared lamp tube to achieve preheating; and a printed layer and a layer to be printed arranged on a substrate below the printer nozzle are secondarily heated through the infrared lamp tube. According to the system and method, the connection strength between layers is effectively improved; and meanwhile, the heat preservation effect is achieved for a period of time, and the interlayer connection can be effectively improved on the basis of previous preheating.

The invention relates to a high-welding-strength polypropylene composition as well as a preparation method and application thereof. The high-welding-strength polypropylene composition comprises an ethylene-propylene block copolymer, an ethylene-propylene random copolymer, low-density polyethylene, cyclic polyolefin, an antioxidant and a lubricant. By adding the low-density polyethylene and the ethylene-propylene random copolymer, a synergistic effect is achieved for improving the melt strength and the welding strength of the product, a thin-wall extrusion pipe can be formed, and the product isexcellent in welding strength and good in sealing performance and has a good application prospect.

The invention provides a cross-linked polyethylene foam material. The foam material is prepared from the following materials: 65-90 parts by weight of polyethylene, 5-30 parts by weight of a polybiologicaloilpolyol, 5-30 parts by weight of a thermoplastic elastomer, 0.5-7 parts by weight of a foaming agent, 0.5-4 parts by weight of a sensitizer, and 0.5-5 parts by weight of an antioxidant. According to the invention, the longitudinal tensile strength of the foam material is greater than 3MPa, the longitudinal elongation is greater than 190%, the transverse tensile strength is greater than 1MPa, the transverse elongation is greater than 300%, the 25% compression ratio is 80KPa or less, and the surface tension is 40mN/m or more; and meanwhile the foam material has an apparent density of 0.2-0.5g/cm<3>. The polyethylene foam can be applied to sealing buffer of a view window and a touch screen of an electronic product or a basic material of an adhesive tap.