51results about How to "Reduce crack phenomenon" patented technology

The invention belongs to the technical field of rubber hoses and relates to a hydraulic hose and a preparation method thereof. The hydraulic hose comprises an inner rubber layer, steel wire layers, a middle rubber layer and an outer rubber layer. An inner rubber sheet of the inner rubber layer is prepared from raw materials including, by weight, nitrile rubber N41, solution polymerized styrene-butadiene rubber, sulfur, a crosslinking agent, a promoter, a scorch retarder, an active agent, a bonding agent, a reinforcing agent, a filling agent, an anti-aging agent, a plasticizer and a processing aid. A middle rubber sheet of the middle rubber layer is prepared from raw materials including, by weight, nitrile rubber N41, solution polymerized styrene-butadiene rubber, sulfur, a promoter, an active agent, a bonding agent, a reinforcing agent, a filling agent, an anti-aging agent, a plasticizer and a processing aid. An outer rubber sheet of the outer rubber layer is prepared from raw materials including, by weight, nitrile rubber N41, rubber-plastic alloy, sulfur, a crosslinking agent, a promoter, an active agent, a bonding agent, a reinforcing agent, a filling agent, an anti-aging agent, a plasticizer and a processing aid. The hydraulic hose can be used within the temperature range from -45 DEG C to 150 DEG C.

The invention belongs to the technical field of preparation of graphite products, and particularly relates to a high-strength graphite product produced by adding pitch coke, and a preparation method thereof, wherein the high-strength graphite product comprises an aggregate and a binder, the aggregate is pitch coke and calcined coke, the binder is coal tar pitch, and a mass ratio of the pitch coketo the calcined coke to the binder is 28-32%:48-52%:18-22%. According to the present invention, the strength of the graphite product is increased by adding pitch coke, wherein the pitch coke has highstrength, the crushed pitch coke and the calcined coke are used as the dry material so as to substantially improve the strength of the graphite product; and the raw materials of the graphite product contain the pitch, and the pitch can be carbonized and coked after roasting, such that only the strength of the graphite product added with the pitch coke can be increased while the change of other indexes cannot be affected, the occurrence of cracks and other unqualified products is low, and the high-temperature oxidation resistance is strong.

The invention relates to a silicon-and-magnesium-containing aluminum alloy sheet for an air-conditioning radiator. The silicon-and-magnesium-containing aluminum alloy sheet comprises the following chemical elements by mass percent: 0.25-0.35% of Si, 0.48-0.55 of Mg, 0.01-0.02 of Cr, 0. 05-0.15 of Fe, 0.01-0.03 of Ti, 0.01-0.03 of Cu, 0.005-0.02 of La, and the balance being Al. The aluminum alloy sheet provided by the invention has high strength and toughness, is added with lanthanum, the composition undercooling is carried out during gold casting, crystal grains are refined, a secondary crystal spacing is reduced, gas and inclusions in an alloy are reduced, and an inclusion tends to be nodulized, the surface tension of a melt can also be reduced, the mobility is increased, and ingots are favorably cast. According to a production method provided by the invention, the phenomena of layering, peeling, bubbling and cracking of aluminum alloy are reduced, and the yield is improved; a refining agent has a good refining effect, so that the pores and slag inclusion phenomena are obviously reduced.

The invention discloses a high-strength waterproof plaster brick with non-metal nanometer material and making method, which comprises the following steps: 1. adding 0.3-0.5% hydrogenous silicon oil into 35-40% water; 2. adding 0.005-0.01% ammonium chloride trimethyl octadecyl; 3. blending 45-50% hemi-hydrate plaster powder, 3-10% sepiolite powder and 3-5% metolline powder into liquid; 4. pouring the liquid into moulding box; stripping; culturing; obtaining the product. The invention makes the water adsorbing rate not more than 5% within 2 h and the conversion factor over 0.75, which improves the strength by 2-8 times and increases the toughness for frame-typed non-bearing wall.

The invention discloses a high-strength fracture prevention air conditioner radiator aluminum alloy sheet. The high-strength fracture prevention air conditioner radiator aluminum alloy sheet comprises the chemical elements of, by mass, 0.12-0.36 part of Cr, 0.15-0.30 part of Mg, 0.21-0.55 part of Cu, 1.22-1.77 parts of Zn, 0.11-0.18 part of Hg, 0.07-0.15 part of V, 0.15-0.28 part of Zr, 0.02-0.06 part of Nb, 0.01-0.03 part of Fe, 0.1-0.5 part of an aluminum alloy leavening agent, and the balance Al. Through addition of Nb and other elements, smell and impurities in alloy are reduced, mobility is improved, ingot formation through pouring is facilitated, and the technical performance is remarkably influenced. Grains of the aluminum alloy sheet are refined, high strength and impact toughness are achieved, the probability of cracks can be reduced through addition of Hg, and the aluminum alloy sheet has good corrosion resistance. By means of a production method, the phenomena of layering, peeling, bubbling and cracking of aluminum alloy are reduced, and the rate of finished products is increased. A refining agent is good in refining effect, so that the phenomena of pores and slag inclusion are reduced remarkably.

The invention relates to a method for fabricating a refractory material prefabricated member expansion joint. The method includes the following steps that at normal temperature, a grouting agent and 'Christmas sprayed snow' are sequentially and uniformly sprayed on outer surfaces of a metal structural part and an anchoring part of a prefabricated member to form a buffer layer, and then still standing is performed; the metal structural part with a solid buffer layer is fixedly placed in a mold, and stirred pug of refractory castable is poured in the mold; and a solidified fire-resistant prefabricated member is subjected to normal temperature life-preserving to enter into a drying process of 300 DEG C to 400 DEG C, a part of the buffer layer on the outer surfaces of the metal structural part and the anchoring part is decomposed into gas to be discharged, the rest part of the buffer layer is melted, and the melted buffer layer permeates into the refractory material through pores of the refractory castable to form the expansion joint. The method for fabricating the refractory material prefabricated member expansion joint has the advantages that the method is suitable for various metal structural parts with complicated surfaces, and the problem that expansion cracks occur when prior fire-resistant prefabricated members are dried and used is solved.

The invention relates to a concrete release agent and a preparation method therefor. The concrete release agent disclosed by the invention is mainly prepared from the following raw materials in partsby weight: 5-10 parts of modified lignin, 22-35 parts of waste engine oil, 0.02-0.05 part of triethanolamine, 0.7-1 part of alkylphenol polyoxyethylene ether, 0.5-1.2 parts of sodium octadecyl sulfonate, 2-4 parts of sodium carboxymethyl cellulose and 55-78 parts of deionized water. The invention further discloses the preparation method for the concrete release agent. The concrete release agent disclosed by the invention is relatively low in cost and simple in synthesis equipment and operation and is in line with various indicators of release agent standards for concrete products JC/T 949-2005; and the concrete release agent can be spray-coated or roll-brushed, and gas-pore and crack phenomena of the concrete products can be effectively reduced. The modified lignin is applied to the concrete release agent, and resources can be fully utilized.

The invention discloses a pre-crushing device of high-purity quartz sand. The pre-crushing device comprises a main body, wherein the main body is internally and fixedly connected with a feeding buffering chamber, a pre-crushing chamber and a discharging buffering chamber; the pre-crushing chamber is arranged in the feeding buffering chamber and the discharging buffering chamber; an outer side wallof the main body is fixedly connected with a first motor; an output end of the first motor is movably connected with a screw rod; a movable block is arranged on the outer surface of the screw rod; the lower surface of the movable block is fixedly connected with a vertical rod; a first movable door is fixedly connected with the lower end of the vertical rod; one side, close to the vertical rod, ofthe upper surface of the first movable door is in sliding connection with a connecting plate. The pre-crushing device disclosed by the invention is reasonable in design and simple to operate and canensure automatic assembly line production so that grains of quartz ores are more uniform; pre-treated materials can be added into a roller machine in an assembly line manner, abrasion, caused by relatively large grains, on a roller surface is alleviated and a crack phenomenon is reduced; the purity of a high-purity quartz sand product is easy to improve.

The invention relates to the preparation technical field of display apparatuses and discloses a pedestal of laser packaging equipment and laser packaging equipment. The pedestal of the laser packaging equipment comprises a metal pedestal body; the metal pedestal body is used for supporting one side of a to-be-packaged substrate; and an insulation structure which is in one-to-one correspondence with a glass powder area of each sub-substrate in the to-be-packaged substrate is provided. According to the pedestal of the laser packaging equipment provided by the invention, the insulation structures are arranged on the metal pedestal body, so that the losing speed of heat which is transmitted to glass powder by the laser is reduced, rapid change in the temperature of the glass powder and the glass substrate is prevented, the crack is further reduced after the to-be-packaged substrate and the glass powder are packaged, and the packaging yield is improved.

The invention discloses an environment-friendly wood-plastic material and a preparation method thereof and relates to the technical field of wood-plastic materials. The environment-friendly wood-plastic material comprises the following raw materials in parts by weight: 30-40 parts of wood powder, 10-20 parts of plastic particles, 0.6-1.8 parts of dispersable adhesive powder, 1-5 parts of modifiednegative ion powder, 0.6-2 parts of cellulose, 3-6 parts of a filling agent, 2-6 parts of a compatilizer, 0.8-1.5 parts of a stabilizer and 0.3-1.2 parts of a lubricating agent. The preparation methodcomprises the following steps: (1) weighing raw materials; (2) mixing materials; (3) removing water vapor; (4) preparing the environment-friendly wood-plastic material. The wood-plastic material disclosed by the invention is resistant to chemical corrosion, impermeable, excellent in compactness, capable of reducing signs of mould and purifying the external environment, green and environment-friendly.

The invention relates to a noise-reducing and energy-saving EPDM polyrib belt which comprises a belt body made from an EPDM material. A group of trapezoidal wedges are arranged on the inner side of the belt body; a canvas layer vulcanized and adhered to the belt body is arranged on the outer side of the belt body, and the paving direction of the canvas layer is parallel to the transmission direction of the polyrib belt; a framework wound framework rope group along the transmission direction of the polyrib belt is arranged in the belt body, and the framework rope group is composed of an aramidfiber yarn and a hollow fiber yarn clinging to each other in parallel; the yarn diameter of the aramid fiber yarn is 0.7-0.9 mm, the yarn diameter of the hollow fiber yarn is 0.5-0.8 mm and the winding density of the framework rope group is 3-5/ cm. The noise-reducing and energy-saving EPDM polyrib belt not only has the characteristics of being long in service life and non-toxic and pollution-free, but also has the advantage of low noise in a using process.

The invention discloses a profile bending device. The profile bending device comprises a bottom plate, and a profile placing assembly, a positioning assembly, a bending assembly and a limiting assembly are arranged on the bottom plate. The profile placing assembly comprises a profile placing seat, an upper pad and a lower pad are arranged on the profile placing seat, and a flat shape profile placing cavity is formed between the upper pad and the lower pad; the positioning assembly comprises a positioning frame arranged on the bottom plate, and a first lower pressing member is arranged on the positioning frame; the bending assembly comprises a rotatable rotating frame, and a force member acting on a power member is arranged on the rotating frame; and a second lower pressing member is further arranged on the rotating frame. According to the profile bending device, fixing and supporting of profiles is firm, the deformation of the profiles is rare in the bending process, meanwhile, throughthe improvement of the upper pad or press block, the crack phenomenon of the profiles during the bending process is greatly reduced, and the bending quality of the profiles is high; and the bending device is accurate and stable in positioning, the bending precision is high, and the product quality is good.

The invention relates to a production method for a refractory precast block. The refractory precast block is preset with a cushion layer between the outside surface of the steel structural component and external refractory material; the required condition of the cushion layer is to have certain strength during normal casting so as to ensure the formation of the self thickness space; low melting points, the cushion layer can be melted in the 100 to 250 DEG C to vacate the original thickness space used for being occupied by the expanded steel structural component. The cushion layer is a PVC foaming packing paper or a liquid PVC forming agent. The production method has the beneficial effects: (1) a familiar PVC forming material is used for replacing previous asphalt and kraft paper, thus greatly reducing the seaminess and rejection rate of the big-and-middle-sized refractory precast block; (2) the production method has low cost, is easy to operate and has little pollution.

The invention discloses a production method of a novel composite powder material containing superfine components. The production method of the novel composite powder material containing superfine components comprises the following concrete steps of (1) mixing glycerinum, fatty acid, ethylene oxide, hexadecanol, triethylamine alcohol and water, feeding into a high-temperature stirrer after preliminary mixing, heating for stirring, and obtaining a grinding agent; (2) feeding cobalt, titanium, tungsten carbide, chromium, copper and steel into a high-energy ball-milling machine for grinding, adding a dispersing agent and the grinding agent obtained in the step 1 during the grinding process, preventing the agglomeration of particles, changing the grinding environment, utilizing a cloth dust collector for recovering after finishing grinding, and obtaining metal composite powder; and (3) feeding the metal composite powder obtained in the step 2 into a reaction stirring tank, and stirring at high temperature. The hardness of superfine powder during use is increased, the crushing resistance is improved, the smoothness of the appearance is further improved due to heavy grinding and the use of the dispersing agent, and the occurrence of the phenomena of breakage and cracks after forming is reduced.

The invention discloses high-dispersibility water-based fluorocarbon coating, which is prepared from the following raw materials in parts by weight: 30 to 50 parts of polyamide resin, 15 to 35 parts of polyacrylic acid emulsion, 2 to 4 parts of 2,2,4-trimethyl-1,3-pentanediol isobutyrate, 5 to 15 parts of kieselguhr, 2 to 6 parts of talcum powder, 1 to 5 parts of white carbon black, 1 to 4 parts of gypsum powder, 2 to 7 parts of hollow glass micro beads, 2 to 6 parts of medical stone compounds, 1 to 5 parts of quartz sand, 1 to 4 parts of driers, 1 to 2 parts of disproportionated rosin, 2 to 4 parts of magnesium stearate, 0.4 to 1 part of N,N-dimethylethanolamine, 2 to 8 parts of montmorillonoid, 2 to 4 parts of fibroin, 1 to 4 parts of diluents and 40 to 80 parts of deionized water. The high-dispersibility water-based fluorocarbon paint has the advantages that the mechanical property, the heat resistance and the anti-corrosion performance are excellent; the thermal isolation and heat insulation effects are achieved; a coating film cannot easily crack; the uniformity is high; the weather-resistant performance is good; the attaching force is good; the anti-scratching and wear-resistant performance is good; the cost is low; environment pollution cannot be caused.

The invention relates to the field of material industry, in particular to an advanced composite material experiment furnace. The furnace comprises an experiment furnace double-layer outer frame and amechanical pump, wherein heating cavities are formed inside the experiment furnace double-layer outer frame, and the heating cavities are composed of upper cavity heating belts and lower cavity heating belts; upper cavity heat preservation layers are arranged outside the upper cavity heating belts, and upper cavity crucibles are arranged inside the upper cavity heat preservation layers; lower cavity heat preservation materials are arranged outside the lower cavity heating belts, and lower cavity crucibles are arranged inside the lower cavity heating belts; and discharging pipelines are arranged at the bottoms of the upper cavity crucibles. According to the advanced composite material experiment furnace, the cavity at the upper portion cannot be oxidized by air during high-temperature smelting through a vacuum unit, and when a base material at the upper portion melts and flows into a reinforcement material, the composited material cannot generate bubbles and is more compact due to the action of high vacuum.

The invention discloses a stainless steel PCM (Pre-Coated Metal Steel) plate and a production process thereof and relates to the technical field of metal plates for household electric appliance shells. According to the technical scheme, the stainless steel PCM plate is characterized by comprising a metal substrate, wherein a chemical treatment layer, a prime coat layer, a finish coat layer and a PE (Polyethylene) membrane layer are sequentially arranged on one side of the metal substrate; a back coat layer is arranged on the other side of the metal substrate; a finish coat comprises the following components in parts by weight: 40-50 parts of an aqueous polyester resin, 20-30 parts of an amino resin, 3-5 parts of triethanolamine, 25-35 parts of butyl acetate, 6-10 parts of cellulose acetatebutyrate, 10-15 parts of butyl cellosolve, 1-2 parts of a leveling agent, 2-3 parts of an organic silicon hand feeling agent and 1-2 parts of a matte agent. As the finish coat with the hand feeling agent and the matte agent is smeared on the metal substrate, the coldness and the metal feeling of the metal substrate can be degraded, the tough feeling of the PCM plate can be gentle, and the appearance attractiveness of the PCM plate can be improved.

The invention discloses a ferrous metal material. The ferrous metal material comprises the following components in parts by weight: 2-5 parts of carbon, 70-80 parts of iron, 0.5-0.8 part of manganese, 0.3-0.6 part of cobalt, 0.2-0.5 part of magnesium and 0.12-0.35 part of tungsten. The ferrous metal material has the beneficial effects that by adjusting and controlling the composition radio and adding sequence of the elements in the alloy steel, cracking generated during a production process is reduced; the quality of the metal material is enhanced; the quality is good; the strength is high; shaping property is good; abrasion resistance is good; the material cannot be broken easily; safety is good; and the service life is long.