11results about How to "Maintain dimensional stability" patented technology

The invention discloses high-heat-resistance modified PP (polypropylene) resin and a preparation method thereof. The high-heat-resistance modified PP resin comprises polypropylene, silicon dioxide, nano calcium carbonate, a heat-resistance modifier, an antioxidant, a stiffening agent, a coupling agent, a surfactant and a dispersing agent, the preparation method comprises the following steps: respectively dispersing silicon dioxide and nano calcium carbonate in ethanol, and then respectively carrying out reflux reaction with a coupling agent; respectively adding a surfactant into the silicon dioxide and the nano calcium carbonate, and stirring; respectively adding a dispersing agent into the surface-modified silicon dioxide and nano calcium carbonate; adding the heat-resistant modifier into the polypropylene resin to obtain a first auxiliary agent, adding the antioxidant into the polypropylene resin to obtain a second auxiliary agent, and adding the stiffening agent into the polypropylene resin to obtain a third auxiliary agent; and adding the dispersed silicon dioxide, nano calcium carbonate, a first auxiliary agent, a second auxiliary agent and a third auxiliary agent into polypropylene resin, and mixing to obtain the high-heat-resistance modified PP resin.

The invention discloses a high-energy-density semi-solid-state lithium battery and a preparation method thereof, and belongs to the technical field of semi-solid-state batteries. The semi-solid lithium battery comprises a positive electrode, a negative electrode and a semi-solid electrolyte, wherein the negative electrode is a silicon-based negative electrode; the semi-solid electrolyte comprises a skeleton layer and gel layers, wherein the gel layers coat the left and right surfaces of the skeleton layer; the framework layer is a mesoporous lithium lanthanum zirconium oxygen-based ceramic framework layer; the raw material of the gel layer comprises a functionalized acrylate gel precursor; the functionalized acrylate gel precursor comprises a functionalized acrylic monomer, a plasticizer and a functional aid in a mass ratio of (60-70): (20-30): (10-20). Through the gel layer, the skeleton layer and the semi-solid electrolyte of the gel layer structure, the buffer volume effect, the skeleton layer and the gel layer form a parallel ion transmission channel, the interface impedance is reduced, the conductivity is improved, and the high-safety semi-solid lithium battery with high ion conductivity and high energy density is obtained.

The utility model discloses a kind of drying setting devices, including drying mechanism, moving mechanism and rotating mechanism, drying mechanism is equipped with drying chamber, moving mechanism can enter and exit drying chamber, rotating mechanism includes driving part, clamping piece and first support, driving part is installed on moving mechanism, the output end of driving part is connected with clamping piece, and clamping piece can be driven to rotate, clamping piece can fix the one end of the cylinder body coated with carbon fiber, first support is movably installed on moving mechanism, and first support is used to support the other end of cylinder body. It solves the problem that the cylinder body coated with carbon fiber is directly placed in the drying oven for drying in the prior art, and uneven heating of carbon fiber is prone to occur.

This invention discloses a polyaromatic hydrocarbon for preparing proton exchange membranes, its preparation method, and its application, belonging to the field of proton exchange membrane material preparation technology. This invention solves problems such as low molecular weight, uneven sulfonation, chain breakage in sulfonated polymers, poor dimensional stability, and poor mechanical properties in proton exchange membrane materials. Using aromatic monomers and 3,5-difluorotrifluoroacetophenone as raw materials, this invention employs a superacid-catalyzed Friedel-Crafts hydroxyalkylation reaction to prepare fluorinated aromatic polymers. Then, sulfonic acid groups are introduced onto the fluorinated aromatic polymers via nucleophilic substitution followed by sulfonation, preparing monosulfonated and disulfonated fluorinated sulfonic acid polymers. Proton exchange membranes are then prepared using these polymers as raw materials. The significant polarity difference between the hydrophobic fluorinated benzene ring side groups and the hydrophilic disulfonic acid groups in this invention is more conducive to forming a microphase separation structure and constructing continuous proton transport channels. Simultaneously, the hydrophobic fluorinated segments effectively suppress membrane swelling and improve its dimensional stability.

This invention discloses a hydrogel patch for repairing gastric perforation and its preparation method, belonging to the field of biomedical materials technology. The preparation method is as follows: Acryloylvaline, acrylic acid, methylenebisacrylamide, compound A, and a photoinitiator are dissolved in an alcohol solvent, and after defoaming, a precursor solution is obtained. The precursor solution is then placed in a mold and cured by ultraviolet light. The resulting hydrogel is immersed in a hydrochloric acid solution to displace the alcohol solvent, yielding the hydrogel patch for repairing gastric perforation. The hydrogel patch provided by this invention has advantages such as resistance to strong acid corrosion, good biocompatibility, low swelling rate, and stable adhesion under fluctuating pH conditions. This strong and stable adhesion ensures that the hydrogel can adhere reliably and persistently to the gastric perforation site in a dynamic gastric acid environment, providing a stable platform for drug delivery, thereby potentially shortening surgical time and promoting wound healing.

The utility model relates to a crown structure of an all-steel truck radial tire. The crown structure comprises a lining layer (1), a carcass ply (2), a belted layer structure and a tread which are sequentially arranged from inside to outside, the belted layer comprises a first belted layer (5), a second belted layer (6), a first rubber sheet (7), a zero-degree belted layer (8) and a third belted layer (9) which are sequentially arranged from the inner side to the outer side; shoulder pads (10) are arranged on two sides of the belted layer structure and are respectively connected with the inner side surface of the tread and the inner side surface of the No.1 belted layer (5). And the zero-degree belted layer (8) is integrally wound in the spiral circumferential direction. Compared with the prior art, the all-steel truck radial tire crown structure disclosed by the utility model has the advantages that the zero-degree belt ply single layer is spirally and circumferentially wound, so that the stress on the shoulder of the tire is reduced, the structural stability of the tire is enhanced, the local stress peak value is reduced, the durability of the tire is improved, the service life of the tire is prolonged, and the high-speed performance and the safety of the tire are improved.

The invention relates to the field of pavement paving equipment, and discloses pavement paving equipment and an intelligent heating system thereof.The pavement paving equipment comprises a frame, extrusion wheels, an asphalt tank, a limiting structure, a cooling assembly and a dispersion plate, the asphalt tank is arranged at the upper end of the frame, the dispersion plate is arranged at the position, corresponding to the asphalt tank, of the lower end of the frame, and three discharge ports are formed in the lower end of the asphalt tank; according to the pavement paving equipment disclosed by the invention, a limiting structure is ingeniously integrated while the pavement paving equipment extrudes an asphalt layer, so that the asphalt layer is effectively prevented from falling from the edge of a pavement in the extrusion process due to the design, and the pavement paving efficiency is improved. The mechanical force is applied to the asphalt layer paved on the road surface through the extrusion wheel, so that gaps and bubbles are eliminated, the flatness and compactness are improved, and the limiting structure ensures that the asphalt layer can be kept stable when being extruded and does not exceed a preset paving range.

The present invention relates to the field of road paving equipment, and discloses a road paving equipment and an intelligent heating system thereof, comprising a frame, an extrusion wheel, an asphalt tank, a limiting structure, a cooling component, and a dispersion plate. The asphalt tank is arranged at the upper end of the frame, and the dispersion plate is arranged at the lower end of the frame corresponding to the asphalt tank. The lower end of the asphalt tank is provided with three discharge ports for discharging asphalt heated into a viscous state onto the dispersion plate through the discharge ports. The road paving equipment of the present invention cleverly integrates a limiting structure while extruding the asphalt layer. This design effectively prevents the asphalt layer from falling from the edge of the road surface during the extrusion process. The extrusion wheel applies mechanical force to the asphalt layer spread on the road surface, which not only eliminates gaps and bubbles and improves the flatness and density, but also the limiting structure ensures that the asphalt layer can remain stable when being squeezed and will not exceed the predetermined paving range.

The invention relates to the technical field of autoclaved curing equipment, in particular to an autoclaved aerated concrete plate curing furnace uniform in steam curing, which comprises a base, the upper surface of the base is fixedly connected with a shell, one end of the shell is rotatably connected with an opening and closing door, the upper surface of the shell is in through connection with a ventilation pipe, and the output end of a driving motor is fixedly connected with a transmission rod. The outer surface of the transmission rod penetrates through one side of the shell and is fixedly connected with a partition plate, one side of the partition plate is provided with a driving assembly, the driving assembly comprises a fixing plate fixedly connected to one side of the partition plate, one side of the bottom of the fixing plate is fixedly connected with a pushing motor, and the output end of the pushing motor penetrates through one side of the partition plate and is fixedly connected with a first lead screw; and when the first screw rod moves rightwards and is extruded by the inclined surface of the extrusion rod, the first screw rod can drive the placement plate to slide downwards to fix the plate, so that the plate can be prevented from moving to influence the maintenance effect in the maintenance process, the plate can be uniformly maintained, and the maintenance effect is improved.

The invention provides a preparation method of a recycled polyester material for liquid phase pressurization, and relates to the technical field of polyester materials, and the preparation method comprises the following steps: S1, material collection, S2, cleaning and treatment, S3, material classification and sorting, S4, material crushing, S5, thermoplastic softening, S6, additive mixing, S7, extrusion molding, and S8, cooling treatment. The temperature of the polyester material can be rapidly reduced through inert gas cooling, rapid curing of the polyester material is promoted, the production period can be accelerated, the production efficiency can be improved, deformation and shrinkage of the polyester material in the cooling process can be reduced through rapid cooling, the shape and size stability of a product can be kept, and therefore the quality and precision of the finished product are improved; the method reduces the risk of cracks and deformation caused by internal stress, improves the structural strength and stability of the product, can reduce the energy consumption by using inert gas cooling, avoids the problems of water resource waste and environmental pollution possibly caused by a traditional water cooling mode, and meets the requirements of energy conservation and environmental protection.

The application belongs to the technical field of high polymer materials, and discloses a flame-retardant hydrophobic copolymer nylon material, a preparation method and application thereof. A low steric hindrance short-chain perfluoroalkyl hydrophobic unit (modified with heptafluoro) and a DOPO flame-retardant unit are integrated in a single caprolactam monomer and embedded in a polymer main chain, so that a hydrophobic barrier is constructed to protect the flame-retardant structure from hydrolysis, a stable mechanism of synergistic enhancement of the two is constructed, and a technical bottleneck that the prior art cannot guarantee long-term safety and reliability of the material under high-humidity harsh environment at the same time is overcome.