115results about How to "No damage to mechanical properties" patented technology

A vessel wall comprises a sealing barrier (6) and a support foot (10) for an item of equipment immersed in the sealed vessel. The sealing barrier comprises a corrugated metal sheet layer (11) having at least one series of parallel corrugations (15), the corrugated metal sheet layer being interrupted at a window (25) surrounding the support foot. The support foot extends longitudinally through the window. The sealing barrier comprises connecting parts (45, 50) for sealingly connecting the support foot to a marginal portion of the corrugated metal sheet layer that delimits the window. The window (25) interrupts the directrices of a plurality (20) of the parallel corrugations of the series, and the support foot is centred at a position situated between the directrices (A) of two parallel corrugations (20).

The invention relates to an ultrahigh molecular weight polythene fiber surface modifying method, comprising: 1. placing ultrahigh molecular weight polythene fiber in organic iron sulfonate solution to soak for 15-60 min, where the organic iron sulfonate solution is iron trichloride solution with mass concentration of 18-60%, or one of the iron toluenesulfonate solution, ferric tri(dodecanesulfonate), iron 2-acylamido-2-demthyl-1-propanesulfonate, or iron morphine propanesulfonate solution with mass concentration of 5-40%, and the organic iron sulfonate solvent is normal butyl alchohol or water; 2. placing the soaked polythene fiber in vacuum device with vacuum of 650-730mmHg in the proportion of 100-120 ml of intrinsic conducting polymer monomer per kg of fiber to process at 25-85deg.C for 0.5-8 h, and making it, where the intrinsic condcuting polymer monomer is pyrrole or thiophene with purity not lower than 99%. And the method can effectively surface adhesiveness of ultrahigh molecular weight polythene (UHMWPE) fiber and besides, keep the original strength of UHMWPE and the process is simple.

The invention discloses a method for improving combining force of a sintered Nd-Fe-B magnet and an electroplated coating. According to the method, the sintered Nd-Fe-B magnet is treated by using a dry type sand blasting method to remove an oxidation layer before the magnet enters into a groove to be electroplated without using an acid washing method to remove the oxidation layer, large current (2-4 times of normal electroplating current) impact electroplating when the electroplating enters into the groove is combined to enhance the combining force between the electroplated coating and the magnet. By adopting the method provided by the invention, the oxidation layer and dirts on the surface of the magnet can be effectively removed; the combining force of the electroplated coating and the magnet is improved; zero discharge of compounds of nitrogen and oxygen is achieved, so environment is not polluted; no hydrogen is produced, and magnet absorbing hydrogen powdering is not caused; mechanical property among crystal phase structures of the magnet is not damaged; due to the large current impact electroplating, the uniformity and sedimentation velocity of the electroplated coating can be effectively improved, the production efficiency is improved, the magnet surface corrosion caused by an electroplate liquid is avoided, and tightness of the electroplated coating, appearance of the electroplated coating and corrosion resistance of the electroplated coating also can be improved.

The invention discloses a pretreatment method for improving lead-bismuth corrosion resistance of ferrite-martensite steel and belongs to the technical field of corrosion protection of nuclear materials. The pretreatment method comprises the following steps: firstly, carrying out quenched-tempered heat treatment for quenching and tempering ferrite-martensite steel, then carrying out surface treatment, enabling the surface of the ferrite-martensite steel to expose metallic luster, and requiring the surface roughness to be smaller than 1 micron; secondly, carrying out cold deformation treatment at room temperature, wherein the accumulated deformation amount is 10-40%; and finally, carrying out high-temperature oxidation treatment, wherein the oxidation temperature is 500-650 DEG C, and the oxidation time is 5-50 hours. Through the pretreatment method with combination of cold deformation and high-temperature oxidation, generation of a compact oxidation film on the surface of the ferrite-martensite steel can be accelerated so as to improve the lead-bismuth corrosion resistance; and meanwhile, the mechanical property of a base body cannot be damaged due to reasonable control of the deformation amount and the high-temperature oxidation system. The method is convenient to operate and lower in cost, and is not limited by sizes and shapes of workpieces, and industrial popularization of the method is facilitated.

The invention discloses a meta-material antenna housing. The meta-material antenna housing comprises a substrate with two side surfaces opposing to each other, and a plurality of artificial metal microstructures periodically distributed on the two opposing side surfaces. Each artificial metal microstructure comprises a first metal branch, a second metal branch and a third metal branch with both centers at the two ends of the first metal branch, fourth metal branches and fifth metal branches, wherein the second metal branch and the third metal branch are perpendicular to the first metal branch; the fourth metal branches perpendicularly extend either from the two ends of the second metal branch towards the direction of the third metal branch or from the two ends of the third metal branch towards the direction of the second metal branch; and each fifth metal branch perpendicularly extends from each fourth metal branch towards the direction of the first metal branch and the fifth metal branches and the first metal branch don't intersect. The meta-material antenna housing provided by the invention has a reflection coefficient S21 lower than that of a pure ABS material antenna housing by a decrease of 0.7 to 0.9 dB and a transmission coefficient S11 higher than that of the pure ABS material by an increase of 10 to 35 dB so that the electromagnetic performance of the antenna housing is greatly improved and the mechanical properties of the antenna housing are not damaged.

The invention discloses a metamaterial antenna housing, which comprises a substrate and a plurality of artificial metal microstructures, wherein the substrate is provided with two opposite side surfaces, and the plurality of artificial metal microstructures are periodically arranged on the two opposite side surfaces. The substrate is virtually divided into a plurality of metamaterial units, and two opposite side surfaces of the metamaterial unit are both attached with one artificial metal microstructure. The artificial metal microstructure comprises an opening metal ring branch provided with an opening, and three straight line metal branches which are arranged inside the opening metal ring and share an endpoint, and an angle formed between two adjacent straight line metal branches is 120 degrees. The reflection coefficient S21 of the metamaterial antenna housing is 20-40dB higher than the transmission coefficient of an ABS material antenna housing, thereby greatly improving the electromagnetic performance of the antenna housing, and being capable of not damaging the mechanical performance of the antenna housing.

The invention discloses electrostatic self-assembly carbon nano tube/nano-carbon black composite mortar. Raw materials of the mortar comprise cement, silica fume, electrostatic self-assembly carbon nano tubes/nano-carbon black, a water reducing agent, sand and water. The minimum static resistivity of the mortar reaches 0.45 omega*m, the range of an absolute value of the resistivity change rate is 3.3%-22.1%, the change range of stress sensitivity is 0.40%-2.69%/MPa, and the change range of the strain sensitivity is 105-704. Compared with the prior art, the electrostatic self-assembly carbon nano tube/nano-carbon black composite mortar and the preparation method thereof solve the problem about dispersion of nanofiller in the mortar very well, and the carbon nano tubes and the nano-carbon black have the collaborative conductive effect, so that the mortar can acquire very low static resistivity and has excellent pressure-sensitivity by the aid of a small mixing amount of electrostatic self-assembly carbon nano tubes/nano-carbon black.

The invention relates to a preparation method of a low-alloy high-strength steel plate with low residual stress. The preparation method comprises the following steps: smelting; performing continuous casting; heating; performing rough rolling; performing refined rolling; performing laminar flow cooling; coiling; flattening; straightening; tempering; and performing cross cutting. In the heating step, the heating temperature is more than 1200 DEG C; in the refined rolling step, the final rolling temperature is 800 DEG C to 900 DEG C; in the coiling step, the rolling temperature is 550 DEG C to 650 DEG C; and in the tempering step, the tempering temperature is 550 DEG C to 650 DEG C, and the tempering heat insulation time is 10 minutes to 20 minutes. The method is applied to the steel plate which is prepared from the following chemical components: 0.04 percent to 0.12 percent of C, 0.10 percent to 0.80 percent of Si, 1.3 percent to 2.1 percent of Mn, 0 percent to 0.06 percent of Nb, 0.0 to 0.6 percent of Mo, 0 percent to 0.10 percent of V, 0.02 percent to 0.20 percent of Ti, 0.01 percent to 0.06 percent of Al, less than or equal to 0.003 percent of B, less than or equal to 0.010 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.008 percent of N, and the balance of Fe and inevitable impurities.

The invention relates to a preparation method of an oriented shish-kebab fiber and belongs to the technical field of biomedical tissue engineering. The preparation method includes the following steps that oriented nanofibers are obtained through an electrostatic spinning method, grafted copolymer is obtained through a graft copolymerization method, and finally the oriented shish-kebab fiber is obtained through the method that the nanofibers obtained through an electrostatic spinning method induce the grafted copolymer to conduct crystallization. Through the special structure, performance of different polymers can be combined to improve the hydrophilia and the cytocompatibility of electrostatic spinning fibers, and the purpose of stimulating a bone tissue structure on the microscopic scale can be achieved.

The invention relates to a surface modification processing device for poly(p-phenylene benzobisoxazole) fiber and a use method of the surface modification processing device. The surface modification processing device partially comprises a tension providing device, a yarn guide device, a surface modification processing groove, a drying device and a coiling device. Through the device provided by the invention, the poly(p-phenylene benzobisoxazole) fiber is subjected to surface modification, the poly(p-phenylene benzobisoxazole) fiber can be continuously subjected to surface processing in real time, the surface performance is improved, meanwhile, the original mechanical property of the PBO fiber is not damaged, and in addition, the processing effect is good. The device provided by the invention has the advantages that the structure is simple, the operation is simple and convenient, and the continuous and industrial production can be realized.

Disclosed is a method of pasting a carbon fiber sheet on an inner wall of a large-diameter pipeline. The first tier of the carbon fiber sheet is pasted by a carbon fiber cloth (2), and the pasting of the carbon fiber cloth (2) comprises the steps of rubbing down an inner wall of a pipeline (1), keeping the surface of the inner wall of the pipeline (1) clean and arid, smearing uniformly a subbing glue on the inner wall of the pipeline (1), and using hands to gently press and paste the carbon fiber cloth (2) on a pasting area after the surface of the subbing glue is dry to touch or the surface of a leveling glue is dry to touch, installing a support device, dismantling the support device, adopting an angle grinder to grind carbon fiber cohesive glue which is squeezed out by the carbon fiber cloth (2), thus guaranteeing levelness of an entire structure plane. The method of pasting the carbon fiber sheet on the inner wall of the large-diameter pipeline realizes reinforcing of the inner wall of the large-diameter pipeline (1) which is buried underground, thus solving the problem of reinforcing the large-diameter pipeline buried underground.

The invention relates to rubber reforming styrene resin and a molded product made by the rubber reforming styrene resin, and the rubber reforming styrene resin comprises: 50% in weight-90% in weight of continuous phase formed by copolymer; and 10% in weight-50% in weight of dispersion phase formed by rubber particles, wherein the copolymers comprise 50% in weight-90% in weight of styrene monomeric units and 10%-50% in weight of acrylonitrile monomeric units; the rubber particle has a non-occlusion structure and an occlusion structure; and total content of dimers or trimers derived from the styrene monomeric units and the acrylonitrile monomeric units of the rubber reforming styrene resin occupies under 5,000 ppm of 100 parts in weight of the rubber reforming styrene resin. The resin has a relatively good processing property, non molding pollution will be generated in making process, and the molded product with relatively good heat resistance and color changing property and machinery property is formed.

The invention provides a thermal conductive resin composition and a molded body formed by using the thermal conductive resin composition. The thermal conductive resin composition, although containing large amount of thermal conductive particles, has excellent molding processability, and can be used for obtaining, for example in injection molding, a molded body with excellent size stability, or in extrusion molding, a molded body with excellent smoothness and good mechanical properties. The thermal conductive resin composition provided by the invention contains terminal conductive particles with an average primary particle size of 0.1-30[mu]m, and thermoplastic resin. The terminal conductive particle includes a magnesium carbonate particle and a coating which is formed through a surface treating agent including methoxysilyl and alkyl.

The invention discloses a PBO fiber reinforced resin-based composite material and a preparation method thereof. According to the method, PBO high-strength and high-modulus fibers are used as a reinforcing material, polyimide resin is used as a matrix, modified phenyl imide silane is used as a coupling agent to carry out surface modification on the PBO fibers, and then the PBO fiber reinforced resin-based composite material is obtained through compression molding of the PBO fibers and the polyimide resin. The composite material prepared by the method has the performance characteristics of lightweight, high temperature resistance, high strength and high modulus.

The invention discloses a long-effect anti-bacterial pain-alleviating and heeling-promoting medical cotton swab, which consists of a cotton stick and composite fiber cotton covering the end part of the cotton swab. The cotton swab uses reproducible and degradable composite polylactic acid fiber cotton for replacing a conventional absorbent ball; the production cost is reduced; the inherent defects of the absorbent cotton are overcome; no adverse influence exists on the wounded surface. The composite fiber overcomes the defect of poor hydrophilicity of the pure polylactic acid fiber; meanwhile, the mechanical performance is not damaged; the long-effect and durable antibacterial capability can be realized; a grafted polydopamine-carboxymethyl chitosan composite film layer is adhered onto the surface, so that the skin-friendly performance, the water absorption capability and the adsorption capability of the composite fiber are further improved; in addition, the introduced carboxymethyl chitosan also has certain effects of alleviating pain and promoting wound heeling. The cotton swab provided by the invention has the advantages that the production process is simple and efficient; the materials in each kink can be cyclically utilized; no adverse influence is caused on the environment.

The invention discloses a flame-retardant polyurethane flexible foam plastic and a preparation method thereof, and belongs to the technical field of flame-retardant polymer materials. A C60/guar gum dispersion and a MoS2/sodium alginate dispersion are prepared, and MoS2 nanosheets and C60 are deposited on the surface of a polyurethane flexible foam matrix by adopting a layer-by-layer assembling process in order to exert the synergistic flame-retardant effects of the MoS2 nanosheets and the C60. The flame-retardant polyurethane flexible foam prepared in the invention has a high fire safety performance.

The invention discloses a polyphosphazene covalent triazine polymer and a preparation method and application thereof. According to the invention, a phosphazene derivative containing a cyano group at an end group is used as a precursor, and a cyclotrimerization reaction is carried out under the catalysis of protonic acid to prepare the covalent triazine polymer containing a phosphazene structure. The polyphosphazene covalent triazine polymer prepared by using the method has the characteristics of simple preparation process, mild reaction conditions, good thermal stability and the like. When theprepared polyphosphazene covalent triazine polymer is applied to flame retardance of epoxy resin, a synergistic flame-retardant effect is obtained, and the polyphosphazene covalent triazine polymer is high in flame-retardant efficiency, does not damage the mechanical properties of the epoxy resin and has great practical application value.

The invention relates to a method for toughening heat-resistant modified polylactic acid with a plant-base composite environment-friendly modifier, which comprises the following steps: removing water from the raw material vegetable oil; proportionally adding polybasic acid/acid anhydride and a nucleating agent, and heating to 140-160 DEG C in an N2 atmosphere to react for 2-8 hours; adding a certain amount of dehydrated lactic acid or lactide, continuing reacting at 140-160 DEG C in the N2 atmosphere for 1-2 hours, heating to 170-190 DEG C to react for 2-10 hours, and vacuumizing the system; and extruding the prepared plant-base environment-friendly modifier polymer and polylactic acid by an equidirectional double screw extruder, blending, drawing, cooling with water, granulating, and drying to obtain the modified polylactic acid granules. Compared with the prior art, the modified polylactic acid granules have the advantages of no toxicity or harm, no harm to the environment and human health and favorable compatibility, and can be completely biodegraded. Besides, the polylactic acid modified by the modifier has favorable heat resistance.

The present invention relates to a new type of rubber compound containing light-colored fillers, which is prepared using a new processing aid.