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315results about How to "Good strength" patented technology

Preparation method of interpenetrating network formed phase-change material

The invention relates to a preparation method of an interpenetrating network formed phase-change material, comprising the following steps of: adding N-hydroxymethyl acrylamide as a network monomer, N, N-methylene-bisacrylamide as a cross linking agent, polyethylene glycol as a phase-change material and distilled water into a flask, ultrasonic-dispersing for 5 minutes after dissolving (the molar ratio of the cross linking agent to the network monomer is (1/7):(1/11), the mass ratio of the network monomer to the water is (1/6):(1/14), and the proportion of the polyethylene glycol accounts for 40-80 percent of the total mass); adding ammonium persulfate as an initiator and continuously ultrasonic-dispersing for 5 minutes, wherein the mass fraction of the initiator accounts for 1.5-3.5 percent of the network monomer; and reacting at a temperature of 70-80 DEG C for 3-4 hours to generate interpenetrating network hydrogel, and then drying to a constant weight to obtain the interpenetrating network formed phase-change material. The preparation method has a simple process and a low production cost and is friendly to environment. Moreover, the phase-change material has the advantages of high enthalpy (reaching over 108.41J/g), less loss, suitable phase-change temperature (32-42 DEG C) and good performance in high temperature resistance.
Owner:DALIAN POLYTECHNIC UNIVERSITY

Fiber-woven pultrusion pipeline and production method

ActiveCN102777708AHigh strength and stiffness and impact resistanceGood strengthRigid pipesTubular articlesPolyresinHeat curing
The invention relates to a fiber-woven pultrusion pipeline and a production method, wherein shape of a pipe is like a cylinder; an inner wall and an outer wall of the pipe are smooth surfaces; inside diameter of the pipe is 20-400 mm; size and thickness of the pipe are determined according to a design requirement; the pipe is woven by a plurality of long fibers to form fiber layers; each fiber layer is provided with a layer of resin materials, and is formed by heat curing; and the fiber layers are composed of a plurality of fiber-woven layers. The production method comprises the following steps: weaving by a plurality of layers; dipping with glue in vacuum; solidifying; dragging; and cutting finished products. Compared with the prior art, the advantage that fiber composites have light weight and high strength is played, the defect that transverse strength and rigidity of normal pultrusion pipes are poor is overcome, and the problem that longitudinal strength of fixed length winding pipes is poor, labor force is more, and processes are fussy also are solved in the invention. Large-size fiber-woven pipelines are pulled and extruded under a state that moulds do not move at the first time; the pipelines can be produced continuously; and production efficiency is high.
Owner:深圳鑫宝通材料科技有限公司

Fatigue test sample clamp with high temperature resistance, high pressure resistance and aqueous corrosion resistance and usage method thereof

The invention belongs to the material test technical field, to be more exactly, relates to a fatigue test sample clamp with high temperature resistance, high pressure resistance and aqueous corrosion resistance and an usage method thereof, which solves the problems of high temperature irresistance, high pressure irresistance, aqueous corrosion, large screw thread slit and poor centering in the current sample clamp. The clamp is provided with a column, a platform, an upper press cap, a lower press cap and a conversion adapter; the lower part of the column of the clamp is fixed on a cover of anautoclave, the upper part of the column of the clamp is fixed on the platform, and respectively and tightly pressed by lock nuts, the lower part of the conversion adapter is connected with a stretching shaft of a fatigue machine, through elevating the stretching shaft, an upper convex plate and a lower convex plate of the test sample are respectively placed in a platform groove and a conversion adapter groove, two dimidiate semirings are pressed on upper convex plate and the lower convex plate of the test sample, the upper press cap and the lower press cap are sleeved, the press cap bolts arescrewed for fixing two ends. The fatigue test sample clamp can be used in the autoclave for carrying out various fatigue tests (stress-stress, stress-tension, tension-tension and the like) under the high temperature high pressure solution environment, and has the advantages of simple structure and low cost.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

Continuously annealed or hot galvanized cold rolled transformation induced plasticity steel plate and preparation method thereof

The invention provides a continuously annealed or hot galvanized cold rolled transformation induced plasticity steel plate and a preparation method thereof. The steel plate comprises the following components: 0.1-0.5% of C, 0.2-2.0% of Al, 0.5-2.5% of Mn, 0.02-0.12% of P, not more than 0.02% of S, not more than 0.01% of N and the balance of Fe. The method comprises smelting, rolling and continuous annealing or hot galvanizing and is characterized in that the hot rolling heating temperature is 1100-1250 DEG C; the heat is preserved for 1-4 hours; the initial rolling temperature is 1100 DEG C; the finish rolling temperature is 750-900 DEG C; the coiling temperature is less than 700 DEG C; accumulated cold rolled reduction is 40-80%; the continuous annealing temperature is 700-(Ac3+50) DEG C; the heat is preserved for 30-360 seconds; the cooling rate is 10-150 DEG C/s; the aging temperature is 250-600 DEG C; the aging time is 30-1200 seconds; the steel plate is cooled to the room temperature at a rate of 5-100 DEG C/s; the hot galvanizing and annealing temperature is 700-(Ac3+50) DEG C; the heat is preserved for 30-360 seconds; the cooling rate is 10-150 DEG C/s; the steel plate is cooled to 400-500 DEG C and enters into a zinc pot after the heat is preserved for 10-300 seconds; the zinc pot temperature is 450-500 DEG C; the impregnation time is 1-10 seconds; the steel plate is cooled to the zinc liquid temperature to be galvanized; the impregnation temperature is 450-500 DEG C; and the impregnation time is 1-10 seconds. The steel plate has good strength, plasticity, forming property, welding property and galvanizing property and is suitable for industrial production.
Owner:ANGANG STEEL CO LTD

Apparatus and method for drawing an optical fiber having reduced and low attenuation loss, and optical fiber produced therefrom

InactiveUS20070283722A1Deterioration in strengthGood strengthCharging furnaceGlass fibre drawing apparatusAttenuation lossHeating element
An apparatus and method for drawing an optical fiber having reduced and low attenuation loss, and good strength are provided. The apparatus comprises a furnace comprising a furnace chamber provided with heating means having heating elements, wherein a preform is suitably suspended in core tube of the furnace so that its tip can be suitably heated to a temperature suitable for drawing a fiber, the top face of furnace chamber is provided with a diffuser having an orifice for pumping inert gas into core tube of furnace chamber so as to maintain positive pressure inside the core tube; an opening suitable for insertion of preform; a felt capable of sealing a gap between said preform and said diffuser so as to avoid entry of atmospheric gases in core tube of furnace chamber and allowing preform with variations in its diameter to enter core tube of furnace chamber; a diffuser plate on its top surface with aims for covering said felt from top and minimizing its contact with the atmospheric gases; characterized in that top end of preform is provided with a tubular member which is an opaque glass tube non-permeable to infrared [IR] radiations generated during heating of preform inside the core tube of furnace chamber and capable of stopping passing of IR radiations therethrough to said felt to avoid local elevation of temperature at joint between handle and optical fiber preform so as to avoid burning of felt provided at diffuser, and hence to avoid formation of gap between said felt and said tube, and creation of cavity in top part of said core tube of said furnace chamber.
Owner:STERLITE OPTICAL TECH

Waterproof ventilated membrane for car light and manufacturing method thereof

The invention relates to a waterproof ventilated membrane for car light. The waterproof ventilated membrane is formed by compounding of three layered structures and comprises a fabric layer, a waterproof ventilated layer and a bonding layer which is arranged between the above fabric layer and the waterproof ventilated layer and is used for connecting the fabric layer and the waterproof ventilated layer. The invention solves defects existing in the prior art. According to the waterproof ventilated membrane for car light, a fabric material and an expanded polytetrafluoroethylene film undergo compounding, laminated water resistance and oil resistance processing so as to obtain a multifunctional high-molecular material, thus endowing the expanded polytetrafluoroethylene film with better strength, waterproofness, permeability, oleophobic performance, long life, weldability and the like and maintaining internal and external pressure balance. The waterproof ventilated membrane can be used to raise reliability of many automobile parts, including parts of a car light, an engine controller/anti-lock braking system module, a sensor, a connector, an electric car window motor, a fuel system and the like, and is applied in automobile and heavy trucks. Air exchange can be carried out rapidly according to the pressure variation generated by temperature change, and vehicles can be protected from being polluted by water, automobile discharged fluids and dust.
Owner:PAN ASIAN MICROVENT TECH JIANGSU CORP

Heat-insulation fireproof sound-absorbing ecological gypsum board made of composite materials

A heat-insulation fireproof sound-absorbing ecological gypsum board made of composite materials utilizes alpha-hemi-hydrated gypsum or beta-hemi-hydrated gypsum as a raw material, and is characterized by further utilizing gypsum whiskers and light materials (pearlite, glazed hollow beads or foam particles) as raw materials. The gypsum board is prepared by pouring, forming by rolling and drying mixed slurry of the three raw materials and water, and the gypsum board comprises, by weight, 20-80% of the alpha-hemi-hydrated gypsum or beta-hemi-hydrated gypsum, 10-65% of the gypsum whiskers and 5-20% of the light materials. The gypsum board can serve as a heat-insulation energy-saving board for an outer wall and an inner wall, a fireproof sound-absorbing tunnel board, a ceiling board and a decorative board, has the advantages of lightness, high strength, fine bending resistance and capability of reaching standards of a level-A fireproof ecological environment-friendly product, heat-insulation boards in different thickness can be produced according to heat-insulation and energy-saving requirements of different regions so as to meet the requirements on heat insulation and energy saving, and the fireproof heat-insulation boards in industrialized production are guaranteed to meet the requirements on energy saving and quality in installation and construction.
Owner:赤壁人和建材有限公司
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