14results about How to "Avoid Structural Defects" patented technology

The invention discloses microcapsule self-regeneration-based long-acting formaldehyde-removing cement and a preparation method thereof, and belongs to the field of building materials and environmental functional materials. The material is composed of Portland cement clinker and a functional composite additive, wherein the additive comprises Zn < 2 + > modified zeolite, a manganese-based catalyst, a pH-responsive sustained-release microcapsule and alpha-semi-hydrated gypsum. According to the invention, through the cooperation of zeolite selective adsorption, non-photocatalytic oxidation of the manganese-based catalyst in an alkaline environment and pH-triggered microcapsule self-regeneration, an adsorption-catalysis-regeneration function closed loop is formed, efficient and lasting removal of formaldehyde under a dark condition is realized, and the mechanical properties of a cement matrix are not damaged. According to the preparation method, the functional components are pre-compounded and then co-ground with the cement clinker, the process is simple, and the preparation method is suitable for industrial production.

The invention discloses nanometer graphene oxide and a preparation method thereof. The transverse size of the nanometer graphene oxide is 10-100 nm, and the thickness of the nanometer graphene oxide is 1-2.5 nm. The surface chemical structure meets the following conditions: a C1s peak is analyzed on the basis of X-ray photoelectron spectroscopy, the sum of the atomic percent content of hydroxyl and epoxy groups is not higher than 15%, and the atomic percent content of carboxyl is not lower than 6%. According to the structural design, the structural defect caused by excessive oxidation or reduction in a traditional method is avoided, and the chemical stability and the functionalization potential of the material are improved.

The invention relates to the technical field of nano materials, in particular to a preparation method of a Zn-based bimetal MOFs material and application of the Zn-based bimetal MOFs material as a medical drug carrying material. The preparation method comprises the following steps: preparing Zn, Mn and a ligand according to a molar ratio of 1: 1: (72-80), and mainly comprises the steps of preparation of metal salt solutions, coordination polymerization reaction, separation and purification, and drying. The process for preparing the Zn-based bimetallic MOFs material is simple and environmentally friendly, the obtained product has the excellent performance of being small in particle size, regular and stable, and the material loaded with doxorubicin hydrochloride has high loading rate and has potential clinical conversion value.

This invention discloses a beam formwork installation and reinforcement device for confined spaces, comprising a disc-lock frame. An aluminum alloy beam bottom horizontal plate is mounted on top of the disc-lock frame, and a beam bottom support formwork is installed above it. A first timber beam is installed between the two. The inner side of the formwork is a concrete beam with integrated columns. Irregularly shaped metal rods with steel plates and clearance grooves are installed on the outer sides of the formwork on both sides of the columns. These irregularly shaped metal rods are connected by a connecting assembly. A second timber beam is installed between the two columns, with both ends contacting small channel steel. L-shaped fixing clips are fixed to the small channel steel. The connecting assembly replaces the original first nut with an end assembly, which includes a magnetic end plate, a square-section threaded sleeve, and a limiting nut. This invention adapts to confined space layouts through a modular aluminum alloy beam bottom horizontal plate and achieves precise reinforcement of the beam formwork while being suitable for operation in confined spaces using irregularly shaped metal rods with clearance grooves and a connecting assembly containing end assemblies.

The invention discloses an efficient environment-friendly curing agent for marine soft soil and a preparation method and application thereof, and belongs to the technical field of soft soil curing. The salt-resistant concrete comprises the following components in percentage by mass: 55%-70% of a core gel system, 8%-15% of a composite excitation system, 5%-10% of a salt-resistant modification system and 10%-20% of a reinforced filling system, the core gelling system is composed of steel slag micro powder, slag powder and desulfurized gypsum; the composite excitation system is composed of modified fly ash and a composite alkali activator; the salt-resistant modification system is composed of a chitosan grafted acrylamide copolymer and zeolite powder; the reinforced filling system is composed of polypropylene fibers, nano calcium carbonate and construction waste regenerated micro powder. The curing agent is a special curing agent system for marine soft soil with strong adaptability, high curing efficiency, good durability and essential environmental protection.

The application discloses a high-strength light-weight silt-based ecological slope protection block compression molding equipment, and belongs to the technical field of slope protection block production. The equipment comprises a rack, an upper mold arranged in the rack, connecting mechanisms arranged at both ends of the upper mold, and a lower mold plate arranged at the bottom end of the upper mold. The upper mold is installed on the rack through the connecting mechanisms, and the upper mold is provided with an opening at the lower end. The lower mold plate is arranged at the bottom end of the upper mold, and a mold cavity is formed between the lower mold plate and the upper mold. A demolding mechanism is arranged on the rack and connected with the lower mold plate to assist in separating the lower mold plate from the upper mold. The inner wall of the upper mold is provided with a Teflon coating, and the upper mold is provided with a material injection mechanism. The vertical rod and the lower mold plate are pulled down through a hydraulic rod, so that the lower mold plate is separated from the upper mold. The device can assist in separating the block in the mold cavity, manual separation is not needed, the demolding action is continuous, and the demolding time is significantly shortened. The automatic demolding reduces the manual operation link, reduces the dependence on skilled workers, and saves the labor cost.

This invention relates to the field of medical polymer materials technology, and discloses an injectable polymer hydrogel and its preparation process. The hydrogel is prepared by in-situ crosslinking of solution A and solution B at a volume ratio of 1:1. Solution A includes oxidized dextran, zinc gluconate, anhydrous betaine, and phosphate buffer, while solution B includes carboxymethyl chitosan and phosphate buffer. This invention utilizes oxidized dextran and carboxymethyl chitosan to construct Schiff base covalent crosslinks, and introduces zinc gluconate to provide delayed metal coordination crosslinks, forming a double crosslinked network; simultaneously, anhydrous betaine is used to construct a hydration shield within the network. This invention effectively solves the problems of needle blockage caused by excessively rapid gelation time in traditional in-situ hydrogels and excessive swelling after implantation, achieving controllable gelation time, stable osmotic pressure, and uniform internal network, exhibiting excellent clinical operability and structural stability.

The application discloses a production method of Ebonite rubber roller based on temperature and pressure intelligent regulation and control, and relates to the technical field of rubber roller production, and comprises the following steps: constructing a temperature collection credibility function according to a local temperature abnormal distribution matrix, fitting and comparing a temperature response of each collection point with a target temperature rising curve, generating a credibility index for judging the credibility of temperature data, and correcting the judgment logic of temperature collection according to the local temperature abnormal change caused by abnormal heat conduction due to air block in the vulcanization temperature rising process. The application solves the problem of temperature control misjudgment caused by local heat conduction abnormality due to air block in the vulcanization temperature rising process of the Ebonite rubber roller, realizes dynamic identification and self-adaptive regulation and control of temperature and pressure abnormality, ensures sufficient vulcanization, uniform structure and stable performance of each area of the rubber roller, and improves product quality and service reliability.

The present application relates to the technical field of gas separation membrane, and particularly relates to a polyimide hollow fiber membrane preparation method for oxygen-nitrogen separation; aromatic dianhydride and diamine are first polymerized at low temperature in N-methylpyrrolidone to prepare a polyamide acid solution, polyvinylpyrrolidone pore-forming additives and polyethylene glycol rheological modifiers are added, and the solution is stirred and vacuum degassed to obtain a spinning dope; then the dope is moved into a spinning kettle, extruded through a hollow spinneret, and simultaneously fed with a core liquid, and then drawn and washed to obtain a nascent hollow fiber membrane; then the nascent membrane is wound and collected, washed with deionized water, and dried at room temperature; the dried nascent membrane is heat treated to completely heat imidize the polyamide acid and form a stable polyimide structure; finally, the membrane is drawn, shaped, and wound to obtain a finished product; through the above method, the spinning solution, spinning process and heat imidization process can be controlled, structural defects of the membrane filament are avoided, the compactness of the polyimide structure is improved, and the application requirements are met.

The invention discloses a method for preparing high-thermal-conductivity aluminum nitride ceramic by utilizing graphite to induce liquid-phase oriented migration. According to the method, aluminum nitride powder is used as a matrix raw material, yttrium oxide is used as a sintering aid, crystalline nano-graphite is used as an active regulating agent, and the high-thermal-conductivity aluminum nitride ceramic is prepared through tape casting, controllable glue discharging and atmosphere sintering processes. According to the method, the crystalline-state nano-graphite initiates a carbon thermal reduction reaction, a grain boundary phase is driven to evolve along a path of YAG-YAM-Y2O3-YN, an oxidation chemical potential gradient is established to induce directional migration of a yttrium-rich liquid phase, deep purification of crystal lattices and construction of a low-phonon scattering communication framework are achieved, and meanwhile, the deoxidization efficiency and the densification behavior are balanced. The maximum thermal conductivity of the aluminum nitride ceramic prepared by the method can reach 192.5 W.m <-1 >. K <-1 >, the maximum bending strength can reach 528 MPa, and the aluminum nitride ceramic has excellent thermal and mechanical properties and can be widely applied to core substrates of high-power electronic devices, 5G base stations, high-power LED thermal management systems and the like.

The application discloses a kind of polybenzodifuranone and its constant potential polymerization preparation method, belong to organic conductive polymer material preparation technical field, benzodifuranone (BFDO) and supporting electrolyte are dissolved in polar aprotic solvent, and electrolyte is obtained by mixing uniformly;With platinum metal electrode as working electrode and counter electrode, with saturated calomel electrode as reference electrode, three electrodes are connected with direct current power supply and are placed in the electrolyte, in air atmosphere, electrochemical polymerization reaction is carried out using constant potential method;After reaction, the reaction liquid is extracted and filtered, dried, to obtain polybenzodifuranone (PBFDO).The application uses constant potential electrochemical polymerization method, n-type conductive polymer polybenzodifuranone can be synthesized in air atmosphere in one step, without catalyst, high-temperature anaerobic environment and complex post-processing, the product conductivity is 1.157-18.28 S / cm.Process simplification, low cost, process controllable, can realize green scale preparation and industrialization application.

The application discloses a sludge brick blank drying method and relates to the technical field of drying. The method comprises the following steps: obtaining a surface evaporation rate and an internal moisture migration rate in a brick blank drying process; comparing the two rates with a preset matching relation algorithm; adjusting and controlling drying conditions according to a comparison result to make the two rates tend to match; and starting a fault-tolerant mechanism to maintain the drying process when data is abnormal or the adjustment and control fails. The application can solve product quality problems caused by the fact that the surface evaporation rate and the internal moisture migration rate do not match in the drying process.

The application discloses a carbon fiber front machine cover decoration piece forming die and a forming method, and relates to the technical field of carbon fiber forming die and forming method. The forming base is sequentially provided with two independent sealing cavities from inside to outside; the two independent sealing cavities are respectively an independent part forming vacuum cavity and a buffer pressure stabilizing vacuum cavity; the differential pressure linkage control mechanism matches the rheological characteristics of carbon fiber prepreg resin, and independently controls vacuumizing, pressure maintaining and pressure releasing of the part forming vacuum cavity and the buffer pressure stabilizing vacuum cavity according to forming process stages, so as to adapt to the forming process of differential pressure exhaust, temperature control compaction and segmented curing. The whole forming die and process can be completely adapted to conventional ordinary oven equipment, and the dependence on high-end autoclave equipment is abandoned. Meanwhile, through structural innovation and process fine control, the short board of poor quality and low yield of traditional oven forming process is solved, and high-precision and low-defect forming effect under low-cost production conditions is realized.

This invention relates to the field of piezoelectric ceramics technology, specifically to a method for preparing low acoustic impedance BT piezoelectric ceramics and their materials. The method includes: Step S1, molding a raw material mixture containing BT powder and a sacrificial pore-forming agent to obtain a green body; Step S2, preheating and holding the green body to remove volatiles; Step S3, degreasing the preheated green body under an oxygen-rich atmosphere to form a uniform fine-pore structure within the green body; Step S4, sintering the degreased green body to obtain the low acoustic impedance BT piezoelectric ceramic material. In this application, by burning off the sacrificial pore-forming agent under an oxygen-rich atmosphere, uniform fine pores are formed inside the piezoelectric ceramic, thus solving the problem that traditional pore-forming techniques in the prior art cannot form a uniform and regular fine-pore structure in the ceramic green body.