39results about How to "Large aperture range" patented technology

The invention provides a preparation method of porous graphene. The method comprises the steps of: heating a carbon material and an activator; obtaining the porous graphene after reaction, wherein the carbon material is modified graphene or graphene, and the activator is a transitional metal or a transitional metal compound; in the process of preparing the porous graphene, heating the graphene or the modified graphene and the activator: the transitional metal or the transitional metal compound to form a transitional metal carbide; further decomposing the transitional metal carbide into carbon and transitional metal to obtain the transitional metal for continuously reacting with the graphene; and circulating in this way to finally obtain the porous graphene. Compared with the prior art, as the transitional metal and the carbon material are reacted circularly, the porous graphene with larger aperture range can be obtained. Experimental result shows that the diameter of the porous graphene prepared by the invention is 1-100nm.

The invention discloses a bone tissue engineering bracket material and a preparation method and application thereof. The bracket material is prepared from calcium phosphate diphase power and has a porous structure with the pore diameter of 100-600 micrometers, the through pore diameter of 45-130 micometers and the porosity of 45-93 percent. The calcium phosphate diphase power contains hydroxyapatite and tricalcium phosphate in the mol ratio of 0-1.

The invention relates to a cutter tool with fine adjustment for rough and fine hole boring. The cutter tool comprises a cutter handle seat, a cutter bar seat and boring cutter heads, wherein the cutter handle seat is fixed on a main shaft of a boring machine; the cutter bar seat is connected to the cutter handle seat; the boring cutter heads are fixed on the cutter bar seat; the cutter tool is characterized in that: the cutter bar seat is eccentrically connected to the cutter handle seat and is provided with two mounting parts for fixing the boring cutter heads; and the cutter bar seat can be provided with two boring cutter heads at most. In the cutter tool, the cutter bar seat is eccentrically connected to the cutter handle seat, so that the cutter bar seat and the cutter handle seat produce an eccentric distance e; the processing radius of boring cutters can be changed by adjusting the relative angular relation of the center of a cutter bar and the center of a cutter handle, and the adjustment accuracy can be improved by performing the adjustment finely; meanwhile, the cutter bar seat is provided with a rough boring cutter head and a fine boring cutter head; the rough and fine boring can be finished by only clamping the cutter tool and a workpiece at one time, so that the working efficiency and the processing accuracy are improved; the cutter tool has a simple structure, and is easy to process and low in manufacturing cost; and a hole processed by the cutter tool has a large aperture range and high rigidity, so that the processing accuracy is improved.

The invention discloses a reductively biodegradable type honeycomb polyurethane support, and a preparation method and application thereof. The preparation method comprises: taking 2,2'-dithiodiethanol as an initiator, employing a ring-opening polymerization method to synthesize double-hydroxy-terminated polycaprolactone containing disulfide bonds; reacting with diisocyanate containing a disulfide bond to form polyester type polyurethane containing disulfide bonds; then dipping a biological template wisteria sinensis with a sodium chloride solution and calcining to obtain a negative template porous sodium chloride of wisteria sinensis; and finally immersing the negative template porous sodium chloride of wisteria sinensis with a waterless organic solution of the polyester type polyurethane containing disulfide bonds, drying and removing the negative template to obtain the honeycomb polyurethane support, wherein the molecular structural formula of the polyurethane is shown in the description. The reductively biodegradable type honeycomb polyurethane support has the advantages of simple technology, easy batch preparation, and strong biodegradation controllability; and the honeycomb structure is beneficial to transportation of substances inside or outside the support, the support can be used as a porous support for tissue regeneration repair, and belongs to a tissue engineering support material with excellent comprehensive performances.

The invention discloses a preparation method of ULPA super performance air filter material, including the following steps: step (1), 20-30wt% of glass fiber with average diameter of 0.1-0.3 Mum, 28-35wt% of glass fiber with average diameter of 0.4-1 Mum, 15-20wt% of glass fiber with average diameter of 5-7 Mum and 20-30wt% of long glass fiber with average diameter of 15-20 Mum are dispersed in water by beating, mass concentration of size is controlled to be 4.5-5.5%, acidity is controlled to be pH 2.1-2.6, and time of beating is controlled to be 40-48min; step (2), size obtained by the step (1) is diluted and stored; step (3), paper is made; step (4), sizing is carried out; step (5), drying is carried out. The invention has the advantages of high poriness, high clogging capacity and high efficiency.

A three-layer rapid composting device and a composting method by the device relate to a composting device and a composting method by the device. The invention aims to solve problems of long composting period, odor pollution and low fermentation efficiency that exist in an existing membrane-covered composting method. The device of the invention comprises a trapezoid cement base, a draught fan, a perforated feed pipe, a V-shaped percolate guiding chute, a waterproof and breathable membrane, a percolate draft tube and a percolate collecting box. the method of the invention comprises the following steps: 1, burden distribution: a fermentation material and a compost clinker are mixed and the mixture is placed at the bottom of the three-layer rapid composting device, the compost clinker is covered, and a waterproof and breathable membrane is covered; 2, fermentation for 7-20 days. According to the invention, the compost clinker and the fermentation material are mixed without adding a conditioner. Thus, purchase expense of a conditioner is reduced, composting period is shortened, and energy consumption is decreased. By changing ventilation direction, no energy is additionally added. In addition, fermentation efficiency is enhanced, and composting period can be remarkably shortened.

The invention discloses a method for preparing three-dimensional chitosan hydrogel by using a high temperature crosslinking method and the obtained chitosan hydrogel. The method comprises the following steps of: (a) dispersing chitosan powder into a deionized water; (b) adjusting the pH of chitosan dispersion obtained in the step (a) to be subacid; (c) carrying out high temperature crosslinking on the solution obtained in the step (b) at the high temperature of 80-125 DEG C; and (d) after the crosslinking reaction is completed, soaking and cleaning an obtained product by using a posttreatment liquid so as to remove a residual acid liquid. The high temperature crosslinking method is simple in the preparation process; the reaction time is short; raw materials are unnecessary for special treatment; highly-toxic chemical substances such as crosslinking agents are not introduced to a preparation course; no any chemical toxicant remains in a final product; and the three-dimensional chitosan hydrogel is even in pore structure, good in connectivity and easy to form, and is very suitably used as a support material of soft tissue engineering such as skin and cartilage.

The invention relates to a battery diaphragm material and a battery with a corresponding diaphragm. The battery diaphragm material at least comprises two layers of materials, which are composited together, wherein a layer of material is obvious in fiber orientation arrangement, and the other layer of material is small in aperture size but large in porosity and is of a three-dimensional network structure; the two layers of materials are composited through a non-hot-rolling process; the surface density of the battery diaphragm material is 40g/m<2> to 100g/m<2>, the alkaline absorption speed of the material is 8cm/30min to 15cm/30min, and the alkaline absorption rate of the material is 300 to 500 percent; the statistical value of an average fiber orientation angle of the material obvious in fiber orientation arrangement is less than 30 degrees; the surface density of the material, which is small in aperture size but large in porosity and is of the three-dimensional network structure, is 20g/m<2> to 60g/m<2>, the aperture of the material is 0.5 to 30 microns, and the porosity of the material is 75 to 95 percent. The battery comprises a positive plate, a negative plate, an alkaline electrolyte, and the battery diaphragm between the positive plate and the negative plate. The specific discharge capacity of the battery is more than 280mAh/g, and the discharge capacity retention ratio of the battery is more than 70 percent.

The invention relates to a bole pitch measurement apparatus comprising a starting end hole plug (1), a reading end hole plug (2) and a ruler (3). The apparatus is characterized in that the upper portion of the starting end hole plug (1) has a cylindrical structure; and a clamp groove is formed in the top at the radial direction. The upper portion of the reading end hole plug (2) has a semi-cone-shaped structure; and a pointer (9) is formed at the tip point of the top of the cone. Annular circular truncated cones (4) are formed at the middle portions of the starting end hole plug (1) and the reading end hole plug (2); and the lower portions have the cone-shaped structures with the large upper portions and small lower portions. One end of the ruler (3) is arranged in the ruler clamp groove (5) of the starting end hole plug (1) and the other end is placed at the annular circular truncated cone (4) of the reading end hole plug (2). According to the invention, the structure is simple; the measurement precision is high; and the application range is wide. The measurement of the hole pitch is not influenced by the subjective judgment of the measurement screw, so that the pitch measurement becomes precise, visual and objective.

The invention discloses an environment-friendly preparation method of porous graphene. The environment-friendly preparation method comprises the following steps: inoculating spore suspension liquid of white-rot fungi into a seed culture solution containing bacterial cellulose membrane blocks, and carrying out culturing, so as to obtain fixed white-rot fungi membrane blocks; inoculating the fixed white-rot fungi membrane blocks into a liquid nutrition-limited culture medium, carrying out culturing for 1-3 days, and adding oxidized graphene suspension liquid to react for 5-24 hours until oxidized graphene adsorbs the surfaces of hyphae of the fixed white-rot fungi membrane blocks; carrying out biological oxidation and degradation, so as to obtain degraded oxidized graphene membrane blocks; peeling hyphae externally adsorbed with oxidized graphene by virtue of tweezers, adding the peeled hyphae into diluted hydrochloric acid, and heating to dissolve; carrying out centrifuging and washing, so as to obtain purified porous graphene suspension liquid; and finally, drying, so as to obtain porous graphene. According to the preparation method, the porous graphene is prepared from fixed white-rot fungi under mild conditions, so that the reaction process is environmentally friendly, the cost is low, and the hole distribution of porous graphene is relatively wide.

The invention discloses a neutral environment-friendly putty powder which has the air purification property and is free of coating brushing and smooth in appearance. The putty powder is prepared from,by weight, 7-23 parts of ultra-high-strength gypsum, 16-40 parts of calcium carbonate powder, 15-35 parts of calcium carbonate, 6-19 parts of non-calcined kieselguhr, 0.2-1 part of hydroxypropyl methyl cellulose, 2-8 parts of redispersible latex powder, 0.1-0.5 part of starch ether, 1-6 parts of sodium bentonite, 5-15 parts of sepiolite, 2-8 parts of attapulgite and 0.1-1 part of mixed crystal titanium dioxide. Accordingly, the putty powder has the properties of good safety, environmental protection, water resistance, respiratory hygroscopicity, formaldehyde and harmful gas elimination and the like, and has good capacity of improving the quality of the living environment; meanwhile, the surface of the putty powder is smooth, firm and white, other coating or wallpaper can be omitted, and the effects of protecting the environment and reducing the cost can be achieved.

The invention discloses a rotary trimming and chamfering device capable of being used obversely and reversely and provides a burr trimming tool. According to the burr trimming tool, operation is easy and convenient, the other finish-machined surfaces are not prone to scratches, the machining efficiency is high, and the surfaces are smooth after burr treatment. According to the technical scheme, the front end of a tool bar guiding body (2) is provided with a hole access guiding body; an L-shaped cutting tool (4) passes through a radial through hole of the hole access guiding body in the radial direction in a length-adjustable mode, and chamfering blades are manufactured on the two sides of a tool bit of the L-shaped cutting tool; the cutting edge of the L-shaped cutting tool is locked and fixed in the axial direction through a locking bolt (5) after being turned downwards or upwards. The rotary trimming and chamfering device is mainly used for removing burrs, which cannot be turned easily, on a rotary surface, and the burrs can be removed manually and can also be removed on a vertical drilling machine. When the rotary trimming and chamfering device is in use, the corresponding tool bar guiding body is selected or a proper hole guiding bush is assembled according to the size of an inner hole of a part, and the burrs are removed through rotary cutting after the position of the cutting tool is adjusted and fixed according to the positions of the burrs.

The invention discloses a preparation method of an antibacterial electromagnetic shielding type plywood, and belongs to the technical field of plates. According to the method, the polyaniline monomersare used as raw materials, the arrangement and conformation of the polyaniline main chains are changed; the conductivity of the polyaniline reaches the maximum value; the electromagnetic shielding performance of the modified polyaniline solution is greatly improved; the wood core board is placed in the modified polyaniline solution for dipping, so that the modified polyaniline solution with the electromagnetic shielding effect is attached to the surface of the wood core plate; the honeysuckle contains rich achyranthes bidentata, inositol, tannic acid and other effective components and can beused for inhibiting various bacteria; silica gel is amorphous silicon dioxide, the chlorhexidine acetate solution can be adsorbed by silica gel, due to the use of the chlorhexidine acetate solution, the antibacterial performance of the plywood prepared by the method can be improved; 3-Glycidoxypropylthrimethoxysilane is used as a coupling agent, mixed and stirred with silica gel adsorbed with chlorhexidine acetate, so that the antibacterial silica gel adhesive is fully fused into an adhesive state. The antibacterial electromagnetic shielding type plywood has a wide application prospect.

The invention discloses a preparation method of a permanent hydrophilic nano graphene polytetrafluoroethylene hollow fiber nanofiltration membrane. The method comprises the following steps: mixing andpressing polytetrafluoroethylene dispersion resin, a nano graphene material, an extrusion aid, nano silicon dioxide and a coupling agent to obtain a green body; extruding the green body through a pushing and pressing machine to form a polytetrafluoroethylene hollow pipe, carrying out stretching and sintering heat setting in a drying oven, and carrying out surface hydrophilic stabilizer treatmentto obtain a permanent hydrophilic nano graphene polytetrafluoroethylene hollow fiber base membrane;; and carrying out water-phase impregnation, oil-phase impregnation and aftertreatment to prepare thepermanent hydrophilic nano graphene polytetrafluoroethylene hollow fiber nanofiltration membrane. The manufacturing method of the permanent hydrophilic nano graphene polytetrafluoroethylene hollow fiber nanofiltration membrane is based on the existing preparation process and equipment of the polytetrafluoroethylene hollow fiber membrane, additional slitting and wrapping equipment does not need tobe added, and the method is simple and easy to implement, low in cost and high in practical value.

The present invention relates to a method and a sampling device for separating and purifying water body micro-organism strains. The method comprises the following steps: step 1, a sample to be separated and purified and a calcium carbonate solution are added to a sodium alginate solution to obtain a precipitate and a suspension; step 2, the suspension is added to an oil phase A composed of sorbitan fatty acid ester and liquid paraffin to obtain a mixed system A; step 3, 6-10 ml of glacial acetic acid is added to the mixed system A, reaction is conducted at 22-25 DEG C for 8-12 min to obtain amixed system B, a calcium chloride solution is added to the mixed system B to obtain microcapsules, and the microcapsules are washed with sterilized water to obtain a microcapsule micro-organism strain bank; and step 4, the microcapsule micro-organism strain bank is inoculated one by one into porous plates to be cultured to obtain single colonies, and the porous plates are loaded with a BM liquidculture medium solution loaded with the micro-organism strains to be separated and purified. The method combines an emulsified micro-balloon method and a porous plate method, and can be used for database foundation and separation for environment functional micro-organism ecological germplasm resources.