14results about How to "Improved shape stability" patented technology

The invention relates to the technical field of ceramic additive manufacturing and high-temperature sintering tools, in particular to a design method of a sintering clamp for photocuring a large-size special-shaped ceramic component. Aiming at the problems of free opening edge curling, thin-wall collapse, cracks, overall warping and the like which are easy to occur during sintering of a photocuring ceramic green body, the method comprises the following steps: firstly, acquiring three-dimensional geometric information of a component and partitioning, and identifying an instability mode and a sensitive area; and then a boundary strategy of shape limitation without shrinkage limitation, controlled sliding, partition supporting and intersection area receding is constructed, structural design and material selection of the supporting ring, the inner supporting core, the burning bearing base, the low-friction isolation layer and the positioning groove are completed, and assembly and use specifications are formed. The sintering bearing clamp obtained by the method can inhibit out-of-plane instability while allowing the component to shrink, reduce shrinkage retardation stress, and improve the sintering formability stability, size consistency and finished product yield of the component. The ice cream barrel-shaped silicon nitride ceramic piece is taken as an embodiment, so that the sintering defect risk can be obviously reduced, and the engineering popularization value is good.

The utility model relates to the technical field of aluminum plate machining, in particular to an arc-shaped aluminum plate punching machine. The arc-shaped aluminum plate punching machine comprises a box body, a collecting assembly is arranged on the inner bottom wall of the box body, a shell is fixedly connected to one side of the upper portion of the box body, a clamping assembly is arranged on the inner side of the shell, an aluminum plate body is installed on the inner side of the clamping assembly, and a connecting block is fixedly connected to one side of the top end of the box body. A hydraulic push rod is installed on one side of the bottom end of the connecting block, a threaded column is fixedly connected to the output end of the hydraulic push rod, a replaceable punching block is in threaded connection to the side face of the threaded column, a protective shell is fixedly connected to one end of the shell, and a supporting column is fixedly connected to the bottom end of the box body. The arc-shaped aluminum plate punching machine has the advantages that the arc-shaped aluminum plate punching machine can adapt to aluminum plates with different lengths and is stable in clamping, and machined finished products can be conveniently collected.

This application relates to a stacked interlocking semiconductor packaging structure, comprising: a substrate, a base plate, two chips, a packaging layer, and a protective shell; the substrate is disposed on the top surface of the base plate, and two chips are disposed on the substrate, with the packaging layer encapsulating the chips and the substrate; the protective shell is disposed on the top surface of the base plate and surrounds the sidewalls of the packaging layer; the protective shell includes: two or more stacked rings, each ring having a limiting groove on its inner sidewall, and the packaging layer having multiple limiting protrusions on its sidewalls, the limiting protrusions matching the limiting grooves for embedding within the limiting grooves. The protective shell surrounding the packaging layer effectively isolates and protects the packaging layer, preventing damage caused by direct exposure of the packaging layer's sidewalls to the outside. This application utilizes a stacked, interlocking ring structure to reliably complete the packaging process of microelectronic components or semiconductor devices; the overall structure is simple and easy to manufacture; it has significant advantages in terms of process speed and cost.

This invention relates to laminated articles of nonwoven fabrics made of crimped composite fibers and articles comprising such laminated articles. This invention provides a nonwoven laminate comprising at least two layers, wherein at least one layer of the laminate comprises a nonwoven fabric of crimped composite fibers, the crimped composite fibers comprising: a first propylene polymer and a second propylene polymer, wherein the melting point of the second propylene polymer is 30°C or more higher than that of the first propylene polymer, the melting point being measured by differential scanning calorimetry (DSC), the melt flow rate (MFR: measurement temperature 230°C, load 2.16 kg) ratio (second polymer / first polymer) of the first and second propylene polymers is 1.7 or greater, the melt flow rate being measured according to ASTM D1238, and the component ratio expressed as the weight ratio of the first propylene polymer / second propylene polymer is 50 / 50 to 10 / 90, wherein the nonwoven fabric has a thickness of 0.484 mm or greater, 10 EA / 10 The curl count is 50 mm or greater, and the longitudinal (MD) stiffness is 50 mm or less in the adhesive area of ​​the embossed pattern.

The invention discloses a heat storage plate of a continuous directional network structure composite phase change material and a preparation method and application. The heat storage plate comprises a base plate and a packaging plate. The base body plate is provided with hollow-out units which are arranged in an array mode, the hollow-out units and the protruding units are provided with continuously-oriented wall bodies, the interiors of the hollow-out units are filled with composite phase change materials, and the protruding units are used for enhancing the heat exchange effect with hot fluid; the packaging plate is used for packaging the substrate plate. According to the heat storage plate, on one hand, the continuous directional network structure composite phase change material provides a complete heat transfer path in the heat storage plate, the heat conduction performance of the heat storage plate is greatly improved, meanwhile, a micro heat conduction network is constructed through expanded graphite, and the heat conduction performance of the heat storage plate is doubly improved; and on the other hand, due to the fact that the size of the hollowed-out units of the base body plate in the heat storage plate is small, the size of the composite phase change material is large, and then the heat storage plate is endowed with large heat storage density.

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 utility model provides an engine hood which comprises a top cover and a heat insulation cover, the heat insulation cover is arranged below the top cover, a plurality of fastening holes are formed in the heat insulation cover, bolts are arranged in the fastening holes, and the heat insulation cover is fixedly connected with the top cover through the bolts. A cooling cavity is formed in the heat insulation cover in a hollow mode, the cooling cavity is filled with cooling liquid, a water inlet and a water outlet are formed in the back face of the heat insulation cover, the water inlet and the water outlet are communicated with the cavity, and the water inlet and the water outlet are connected with an external heat dissipation water tank. Heat generated by the engine can be effectively absorbed, meanwhile, the ventilation structure on the top cover is combined, air convection is formed, the heat dissipation effect is further enhanced, the temperature of the surrounding environment of the engine is effectively reduced, and normal operation of the engine is guaranteed.

The application belongs to the technical field of electromagnetic shielding materials, and particularly relates to a flexible phase change material with heat-conducting insulation and electromagnetic shielding performance, and a preparation method and application thereof. The method comprises the following steps: dispersing silver nanowires in ethanol, and then performing vacuum filtration to obtain a silver nanowire film; dissolving polystyrene in a mixed solution of tetrahydrofuran and water, then adding boron nitride fillers to mix, obtaining a slurry, then pouring the slurry onto the surface of the silver nanowire film, and standing to obtain a functional carrier film; and finally, immersing the functional carrier film and the phase change material in a vacuum oven to obtain the flexible phase change material. The preparation method is simple and convenient to operate, each step adopts conventional experimental equipment and process, and does not need complex special equipment, which is beneficial to reducing production cost and improving production efficiency. The prepared phase change material is integrally formed without layering, avoids layering damage caused by performance difference between layers, further guarantees application stability, and is beneficial to realizing long-term stable use.

The application discloses intelligent temperature-regulating aluminum honeycomb composite board based on phase change material and a manufacturing process thereof, and relates to the field of building energy saving.The phase change material provided by the application is prepared from graphene composite cellulose and hydroxyethyl methacrylate as raw materials, and is formed through freezing forming, freeze drying and heat crosslinking treatment to form composite cellulose aerogel, and then vacuum impregnation of polyethylene glycol is carried out; the graphene composite cellulose is prepared by reaction of amino cellulose, epoxy functionalized graphene and epoxidized polymer, so that the heat conduction path of graphene and the rigidity and heat-resistant structure of polymer are synchronously introduced; the phase change material is filled in the aluminum honeycomb board, and then compression is carried out to obtain the intelligent temperature-regulating composite board.The phase change material prepared by the application has low leakage rate, high thermal conductivity and excellent mechanical properties, and is suitable for the field of building energy saving.

According to the high-strength sealing rubber strip, a sealing part is semicircular and is provided with a semicircular cavity, a V-shaped supporting strip is embedded into the sealing part, and meanwhile a stable triangular supporting system is formed by fixedly connecting a first hollow cylinder with the bottom wall of the cavity and fixedly connecting a second hollow cylinder with the arc-shaped wall face of the cavity; by means of the structure, external pressure can be effectively dispersed, the anti-pressure capacity of the rubber strip is remarkably improved, good shape stability can be kept even under the condition that the rubber strip bears large external force extrusion for a long time, and sealing failure caused by deformation is avoided; due to the combined design of the semicircular cavity and the V-shaped supporting strip, when the sealing rubber strip is extruded, the sealing rubber strip can be tightly attached to the sealing surface and fill gaps through elastic deformation of the cavity and the structural counter-acting force of the supporting strip, the sealing effect is greatly improved, and permeation of media such as water, dust and gas is effectively prevented.

The invention relates to the technical field of photovoltaic silicon plate electroplating, in particular to a horizontal electroplating conductive roller and a conveying mechanism. Comprising a conductive part, an insulating soft rubber layer, a conductive shaft and a metal wire, the end of the metal wire penetrates through the insulating soft rubber layer and extends outwards to form a conductive contact, insulating partition plates extend outwards in the center of the conductive shaft in the circumferential direction, and an arc-shaped conductive strip is arranged between every two insulating partition plates. According to the design, the surface of the roller body is made of an insulating material, the surface of the roller body is prevented from being plated with copper only through electric conduction of the conductive contacts and the silicon plate, the power supply device intermittently supplies power to partial areas of the roller body, the areas except the positions in contact with the silicon plate are powered off, conductive contacts in other areas are prevented from being powered on and plated mistakenly, the maintenance time is prolonged, and the electroplating liquid loss is reduced; a plurality of contacts are in synchronous contact, and current contact interruption is avoided.

The invention relates to the technical field of heat conduction materials, in particular to low-heat-resistance low-oil-permeability anti-aging thixotropic high-heat-conduction silicone grease and a preparation method thereof. According to the silicone grease, dimethyl silicone oil and vinyl-terminated polydimethylsiloxane serve as matrixes, layered interface modified spherical aluminum oxide and flaky boron nitride are compounded to serve as heat conduction filler, and hydrophobic fumed silica and a fixed-point micro-crosslinking system are added. Through a process of firstly constructing a heat-conducting network and then triggering sparse crosslinking, high heat conductivity coefficient, low interface thermal resistance, good thixotropy and long-term thermal stability are realized, the problems of oil leakage, sedimentation and aging under high filling are effectively solved, and the composite material is suitable for heat dissipation of high-power electronic devices.

The invention relates to the technical field of fiber manufacturing, in particular to a special-shaped section polylactic acid hollow filament as well as a preparation method and application thereof. According to the filament, a stereocomplex crystal sc-PLA is constructed by adopting PLLA / PDLA in a near equal proportion, and a multifunctional epoxy chain extender, a polycarbodiimide hydrolysis-resistant agent, a quaternary ammonium salt organized flaky montmorillonite and phosphate / phosphonate metal salt compounded nucleation system and a polyether type reaction grafting hydrophilic agent with a sulfonate ion group and an epoxy reaction group are synergistically introduced. The hydrophilic groups are covalently fixed; and the washable stability is improved. The material meets the conditions that the sc-PLA melting peak is 220-235 DEG C, delta Hmsc is larger than or equal to 12 J / g, the proportion is larger than or equal to 0.55, the grafting rate is larger than or equal to 60%, the ion group retention rate is larger than or equal to 80%, and the contact angle is smaller than or equal to 70 degrees after washing is conducted five times; the wicking height after washing can be increased by more than or equal to 20% when the fabric is used for fabrics, and the fabric has warm keeping and lasting moisture guiding functions.

The invention discloses a preparation method of a PAN-based solid-solid phase change material, which comprises the following steps: step 1, uniformly mixing acrylonitrile and phase change monomers, and heating until all the monomers are completely molten to form a uniform liquid system; adding an emulsifier, a chain transfer agent and deionized water into the liquid system, and completely emulsifying all monomers to obtain a stable emulsion system; step 2, placing the emulsion system in an oxygen-free environment, and adding an initiator solution for free radical polymerization reaction to obtain a polymerized emulsion system; step 3, adding the polymerized emulsion system into the salting-out agent solution, and standing to form a polymer precipitate; and washing the polymer precipitate to remove unreacted monomers and impurities, and drying to remove moisture, thereby obtaining the PAN-based solid-solid phase change material. According to the invention, PAN is taken as a main chain, a side chain with a phase change function is introduced through free radical copolymerization, and a brand-new polymer type phase change energy storage material is constructed.