48results about How to "Good hole forming effect" patented technology

The invention provides a preparation method of porous three-dimensional silk fibroin material, comprising the following steps of concentrating a silk fibroin solution, and manufacturing a bracket by the processed silk fibroin solution through a salting out method. By utilizing the self-assembling behaviors of silk fibroin, a secondary structure of the silk fibroin is improved. Compared with other methods of obtaining porous brackets, not only can the pore-forming property be good but also the inner walls of pores are in a very obvious fine structure.

The invention provides a preparation method of an enhanced bacteriostatic and breathable composite fiber electrostatic spinning membrane. The preparation method includes the following steps that 6-8 parts of polyvinyl alcohol are weighed and dissolved in 100 parts of 60-80 DEG C deionized water, and a PVA water solution is prepared; (2), 4 parts of active bacteriostatic substances are added into the PVC water solution, the active bacteriostatic substances are formed by mixing cinnamon essential oil, allicin, tea polyphenol and thyme essential oil according to the mass ratio of (2-4):(1-3):(0.5-2.5):(0.4-2.4), then 0.5-1.5 parts of cyclodextrin and 1-3 parts of corn porous starch are added, after the materials are fully mixed and stirred for 5-8 hours, 5-10 parts of sodium trimetaphosphateand boric acid complex are added for crosslinking, the sodium trimetaphosphate and boric acid complex is formed by compounding sodium trimetaphosphate and boric acid at the mass ratio of 4:5 until thesolution is uniform, and a spinning solution is obtained; (3), the spinning solution is arranged on an electrostatic spinning machine for spinning, and a spinning membrane is obtained; (4), the spinning membrane is subjected to glutaraldehyde fumigation crosslinking, and after the spinning membrane is dried in the air, the composite fiber electrostatic spinning membrane is obtained.

The invention discloses a drill rod with functions of hole protecting, pressure relief and internal slag discharging. The drill rod comprises hollow rod bodies, flow injecting pipes coaxially arrangedin the rod bodies, and supporting pieces connecting the rod bodies with the flow injecting pipes; slag discharging channels are formed between the inner walls of the rod bodies and the outer walls ofthe flow injecting pipes; the flow injecting pipes are internally provided with air inlet and water inlet channels; and with the direction opposite to the rotating direction during drilling of the drill rod bodies as the reverse direction, the outer cylindrical surfaces of the rod bodies are provided with spiral grooves rising in the reverse direction and in cylindrical spiral shapes, and a plurality of pressure relief holes communicating with inner cavities in the rod bodies are formed in the spiral grooves. During drilling of a soft coal seam and an outburst coal seam, the drill rod has theadvantages that the hole protecting ability is high, the slag discharging channels are not prone to being plugged, the hole forming effect is good, the slag discharging and temperature reducing abilities are high, and the hole collapse area is automatically dredged.

The invention provides an electrolyte resistant wrinkle lithium ion battery diaphragm preparation method. The electrolyte resistant wrinkle lithium ion battery diaphragm preparation method comprises the following steps that polypropylene raw materials are provided; the polypropylene raw materials are melted and extruded, a piece is made into a diaphragm by casting, and cooling is performed to obtain a diaphragm piece; heat treatment is performed on the diaphragm piece to make the diaphragm piece be perfect in crystallization, and then the cooling is performed; the diaphragm piece is subjectedto cold stretching to form microdefects, and then hot- stretching pore broadening is performed; heat shaping is performed on the stretched diaphragm piece; and natural cooling annealing is performed on the diaphragm piece after the heat shaping to obtain a lithium ion battery diaphragm finished product. According to the electrolyte resistant wrinkle lithium ion battery diaphragm preparation method, the melt index of the polypropylene raw materials is 0.8-1.8 g/10min, the isotacticity is 98-99%, the number-average molar mass is 410000-480000, and in the stretching step, the cold stretching temperature is 80-100 DEG C, the cold stretching multiple ratio is 1.03-1.07, the hot stretching temperature is 135-145 DEG C, and the hot stretching multiple ratio is 3-5. The invention further providesan electrolyte resistant wrinkle lithium ion battery diaphragm obtained by the electrolyte resistant wrinkle lithium ion battery diaphragm preparation method.

A porous hollow fiber membrane includes at least a first solvent and a second solvent. The first solvent is at least one selected from sebacic acid esters, citric acid esters, acetyl citric acid esters, adipic acid esters, trimellitic acid esters, oleic acid esters, palmitic acid esters, stearic acid esters, phosphoric acid esters, C6-C30 fatty acids, and epoxidized vegetable oils. The second solvent is different from the first solvent, and is at least one selected from sebacic acid esters, citric acid esters, acetyl citric acid esters, adipic acid esters, trimellitic acid esters, oleic acid esters, palmitic acid esters, stearic acid esters, phosphoric acid esters, C6-C30 fatty acids, and epoxidized vegetable oils. The porous hollow fiber membrane has a three-dimensional network structure.

The invention discloses a preparation method of an aryl bridged silsesquioxane monomer. The preparation method comprises the following steps: performing Grignard reaction on dihalogenated arene and metal magnesium to prepare a Grignard reagent; performing nucleophilic substitution reaction on the Grignard reagent and triethoxychlorosilane to produce the aryl bridged silsesquioxane monomer. In the reaction, triethoxychlorosilane serves as a reaction raw material, so the reaction has low activation energy and strong specificity, the yield of the aryl bridged silsesquioxane monomer is high, and aryl bridged polysilsesquioxanes prepared from the prepared aryl bridged silsesquioxane monomer through hydrolysis-polycondensation has excellent pore-forming property and high-temperature resistance.

The invention provides a tray piercing guide hole device and a guide hole permeable brick preparation method. The guide hole device is composed of a chassis, guide hole needles and a lifting system. The guide hole needles are distributed on the chassis according to a certain arrangement spacing, tips of the needles are vertical and upward, and the lifting system is arranged under the chassis. According to the distribution of the guide hole needles on the guide hole device, a tray is pre-pierced, the guide hole device enables the guide hole needles to penetrate through the tray until the chassis is attached closely to the piercing tray by lifting the lifting system, and permeable bricks are formed by twice material distributing and one time compacting; and finally, the lifting device drivesthe chassis down, the guide hole needles are pulled out from the permeable bricks, guide hole permeable hole channels are formed in structural layers, and the permeable bricks of tray piercing guideholes are manufactured. The permeable bricks use artificial hole making, the pore connectivity is good, and the problem that the strength and permeability of traditional permeable bricks are incompatible is solved; and the guide hole device is suitable for any brick machines as an independent whole, and the hole forming effect can be achieved without the modification of the brick machines.

The invention relates to a composite hollow fiber membrane. The composite hollow fiber membrane is characterized by comprising the following steps: preparing a membrane casting solution; preparing a core solution and an outer gel bath; utilizing a dry-wet spinning device to inject the core solution and the membrane casting solution into a spinneret together for hollow fiber spinning, and extruding from the spinneret together to prepare a hollow fiber membrane wire; and enabling the hollow fiber membrane wire obtained in the step to pass a dry spinning path of 0-35cm and sequentially enter a first gel bath and a second gel bath for gel phase inversion to form the high polymer hollow fiber porous membrane with a microprous pore canal. The composite hollow fiber membrane prepared by the method disclosed by the invention is a hydrophilic hollow membrane material and has higher membrane flux and good pollution resistance at low pressure; simultaneously, the hollow fiber membrane has better mechanical strength due to the complementary property of the raw materials.

The invention relates to a preparation method of a composite hollow fiber membrane. The preparation method is characterized by comprising the following steps: preparing membrane casting liquid; preparing core liquid and external gel bath; injecting the core liquid and the membrane casting liquid together into a spinning nozzle by utilizing a dry-wet spinning device, and extruding together from the spinning nozzle so as to prepare a hollow fiber membrane filament; carrying out dry spinning on the hollow fiber membrane filament prepared in the previous step in a dry spinning path of 0-35cm, and carrying out gel phase conversion sequentially in first gel bath and second gel bath so as to form a macromolecule hollow fiber porous membrane with a micro duct. The composite hollow fiber membrane prepared by the invention is a hydrophilic hollow membrane material, has relatively high membrane flux at low pressure, is good in pollution resistance, and meanwhile has relatively good mechanical intensity because of complementarity of raw materials.

The invention discloses an unstable stratum variable-diameter casing pipe hole-protecting drilling process. The unstable stratum variable-diameter casing pipe hole-protecting drilling process can realize hole-protecting directional drilling in an unstable stratum, and solves the problems of hole collapse, hole shrinkage and the like in unstable stratum drilling, under the hole protection effect ofa variable-diameter casing pipe, the situations of hole collapse, hole shrinkage and the like in an unstable stratum hole section during subsequent drilling are avoided, drill jamming and drill falling accidents are avoided, smoothness of a directional drilling channel is guaranteed due to the hole protection effect of the variable-diameter casing pipe 2 in the unstable stratum hole section, therequirements of a mine for gas control, water damage prevention and the like are met, and the method is good in effect in the construction process, high in stability, high in unstable stratum hole protection drilling efficiency and good in hole forming performance.

The invention discloses a method for preparing a flexible circuit board based on a liquid crystal polymer film, and the method comprises the steps: firstly, preparing a metal foil, and preparing a prefabricated film of a liquid crystal polymer material with the tensile modulus of 0.5-6.0 GPa and the bending modulus of 1.0-11.0 GPa; adjusting the tensile modulus of the prefabricated film from 0.5-6.0 GPa to 1.8-3.5 GPa through the modulus adjusting procedure; besides, adjusting the bending modulus of the prefabricated film to 2.0-8.0 GPa from 1.0-11.0 GPa through the modulus adjusting procedure, and obtainng a finished film, wherein the modulus adjustment process comprises the following steps: carrying out heat treatment on the prefabricated film under the condition of temperature T, cooling the prefabricated film, and controlling the heat treatment time t and the cooling rate vt; then, enabling the metal foil and the finished film to be subjected to hot press molding, and obtaining a molded metal-clad plate; and finally, etching a circuit on the metal conductive layer coated with the metal plate according to the circuit design drawing, and carrying out hole turning and electroplating on the circuit to obtain the flexible circuit board. The problem that in the prior art, a metal-clad plate has the hole forming defect can be solved.

The invention discloses a CFG pile implanting construction method suitable for the composite soft and hard geology. Firstly, a rotary excavating machine is used for drilling a hard stratum, then a long spiral machine is used for conducting repeated drilling till the designed elevation is achieved, and finally concrete pouring is conducted; and the interval time of drilling of the rotary excavatingmachine and drilling of the long spiral machine is controlled to be within 1 hour. By means of the CFG pile implanting construction method, the mechanical degree is high, the labor intensity is low,mature supporting measures are achieved on the construction quality and safety, the construction noise is low, construction materials are few, equipment for use is simple, the equipment transfer costis low, the construction speed is high, and the social benefits are obvious.