16results about How to "Improve interface strength" patented technology

This invention discloses a concrete mix design and manufacturing method for underground engineering concrete in a coupled environment of underground environment and load, relating to the field of underground engineering concrete technology. It aims to address the problem that traditional concrete mix design does not fully consider the coupling effect of underground environment and load. The underground environment includes groundwater erosion, wet-dry cycle, and temperature fluctuation; the load includes stress ratio. α s Dynamic load frequency and dynamic load amplitude α d This leads to technical problems such as insufficient erosion resistance, crack resistance, and mechanical stability of concrete, resulting in a short service life. This mix design is based on quantitative analysis of coupled environmental parameters. With cement, composite admixtures, recycled aggregates, modifiers, water, and additives as core components, the basic mix proportion is determined through a mapping model between "environment-load" coupled parameters and component content. The target mix proportion is then obtained through orthogonal experimental optimization. The manufacturing method includes four core steps: raw material pretreatment, graded mixing, gradient curing, and coupled environmental simulation curing.

The application provides a live working insulation shielding blanket, which comprises a surface layer and an inner layer, the surface layer has two layers and is attached to the outer surface of the inner layer, the inner layer is a multi-layer structure arranged in a laminated mode, the raw material of the surface layer comprises EVA, montmorillonite loaded with imidazole polybasic borate complex, natural rubber, PA6 short fibers, EVA-g-MAH, a flame retardant, an antioxidant and a colorant, and the raw material of the inner layer comprises EVA, montmorillonite loaded with imidazole polybasic borate complex, natural rubber, EVA-g-MAH and a colorant. The montmorillonite loaded with imidazole polybasic borate complex is added to the surface layer and the inner layer in cooperation, multiple protections of outer molten prevention and inner collapse prevention are realized, the service life of the material in an extreme environment is effectively prolonged, and the problems of easy softening and insulation failure of a traditional EVA insulation shielding blanket under high temperature are solved.

The present application relates to a kind of low carbon environmental protection rock wool composite material and its preparation method.The method is first activated by using choline chloride-polyol constructed deep eutectic solvent to rock wool fiber, form more reaction sites;Subsequently, introduce phytic acid to construct stable multidentate chelation layer, improve the chemical reaction activity of fiber surface;Finally, through epoxy etherification end-capping, form the compact interface bonding structure, so that modified fiber has higher compatibility and interface stability.Modified rock wool fiber and halogen-free flame retardant, biological coupling agent, plant wax hydrophobic agent and organic small molecule are synergistically compounded, can construct stable and uniform three-dimensional reinforcing network.The obtained composite material is significantly improved in mechanical properties, water resistance, durability and flame retardant performance, while maintaining good processing adaptability and material stability.The present application is suitable for high-performance insulation board, building thermal insulation structure and weather-resistant composite material field.

The application relates to the technical field of ceramics, and discloses a high-strength high-temperature-resistant ceramic material and a preparation method, wherein graphene oxide and polyamide naphthalene sulfonate dispersant are reacted, then mixed with clay, quartz powder, talc powder, fly ash and the like through ball milling, calcined, and finally a high-strength high-temperature-resistant ceramic material is obtained. The polyamide naphthalene sulfonate is grafted to the surface of graphene, the dispersibility of the graphene is improved, and the mechanical strength of the ceramic material is improved. The main chain of the polyamide naphthalene sulfonate dispersant contains an amide bond, and the side chain contains a naphthalene sulfonate structure, so that the quartz, fly ash and the like can be dispersed, the apparent porosity of the ceramic is significantly reduced, and the bending strength and other mechanical properties are improved.

The invention discloses a preparation method of anti-crack and anti-freezing fiber composite concrete, and relates to the field of concrete. The preparation method comprises the following steps: immersing bionic spider silk into a microbial mineralization solution, adding a photoresponse nano material, and adjusting illumination, so that calcium carbonate crystals are arranged in a honeycomb shape on the surface of the spider silk, bionic spider silk fibers and microbial mineralization layers are alternately deposited, and a'fiber-mineralization layer-fiber 'sandwich structure is constructed. The structure cooperates with a spider silk spiral and honeycomb mineralization layer, the concrete interface strength is greatly improved, shrinkage cracks are effectively inhibited, microorganisms are activated and mineralized in the cracks to repair the cracks, and the concrete is endowed with high crack resistance and self-repairing capacity. Meanwhile, the self-made nano-composite fiber takes polyvinyl alcohol and ethylene glycol copolymer as main materials, polylactic acid micro-cavities containing anhydrous calcium chloride are connected to two ends of the self-made nano-composite fiber, and the freezing resistance of the concrete is improved by the hydrophilicity of the polyvinyl alcohol and the heat release of the anhydrous calcium chloride. The anti-cracking and anti-freezing fiber composite concrete prepared by the invention has the effects of high cracking resistance and high freezing resistance.

This invention discloses a high-temperature resistant downhole emulsion explosive and its preparation method, belonging to the field of emulsion explosive technology. The emulsion explosive comprises an aqueous phase material, an oil phase material, and a sensitizer, with a mass ratio of (88-96):(4-12):(0.8-2.0). The aqueous phase material, by mass parts, includes the following raw materials: 70-80 parts ammonium nitrate, 4-6 parts sodium nitrate, 5-8 parts urea, 0.1-0.6 parts chitosan quaternary ammonium salt, and 10-20 parts water. The oil phase material, by mass parts, includes the following raw materials: 50-70 parts composite oil phase and 20-40 parts composite emulsifier, which includes Span80 and polyisobutylene succinimide derivatives. This invention involves adding the aqueous phase material to the oil phase material, adding the sensitizer to the emulsion matrix formed by emulsification, and stirring to prepare the emulsion explosive. The emulsion explosive provided by this invention is suitable for use in deep well high-temperature environments and exhibits good high-temperature stability.

The application discloses an ultrahigh molecular weight polyethylene-acrylonitrile butadiene rubber composite elastic material, which comprises 70wt%-95wt% of ultrahigh molecular weight polyethylene and 5wt%-30wt% of acrylonitrile butadiene rubber powder, has an island-sea structure, wherein the acrylonitrile butadiene rubber powder is a dispersed phase, the ultrahigh molecular weight polyethylene is a continuous phase, and the dispersed phase and the continuous phase are connected by C-C chemical bonds; and the particle size of the acrylonitrile butadiene rubber powder is less than or equal to 0.7mm. By limiting the content of the ultrahigh molecular weight polyethylene and the acrylonitrile butadiene rubber powder, combining the connection between the two phases by C-C chemical bonds and limiting the particle size of the acrylonitrile butadiene rubber powder, the rubber particles in the composite elastic material are first deformed when the composite elastic material is subjected to external force, so that the composite elastic material has good resilience and lower permanent deformation at a smaller strain.

The invention discloses a carbon fiber transmission shaft and a forming mold and a forming method thereof, and relates to the field of carbon fiber composite materials. The carbon fiber transmission shaft comprises a transmission shaft body and a shaft head. The transmission shaft body is made of a carbon fiber composite material and is tubular, and shaft heads are arranged in cavities at two ends of the transmission shaft body; the shaft head is made of metal or alloy and is tubular; the shaft head and the transmission shaft body are installed in an inverted fit mode. And the shaft head and the transmission shaft body are co-cured integrally formed parts. The invention further discloses a forming die and a forming method, reverse buckling type connection and co-curing integrated forming of the transmission shaft body and the shaft head can be achieved on the basis of the forming die and the forming method, and the defects caused by the fact that in the prior art, a carbon fiber composite transmission shaft cannot be wound away after connection and after connection are overcome. The connection strength of the carbon fiber composite transmission shaft is improved, the dynamic balance of the transmission shaft is optimized, and the production efficiency is improved.

The application discloses a coating material for optical fiber and a preparation method thereof, an optical fiber insulator and a preparation method thereof. The preparation raw material of the coating material comprises the following components in parts by weight: tetrahydrofuran acrylate 40-60 parts by weight, carboxyl modified polyurethane acrylate oligomer 30-50 parts by weight, silicone modified epoxy acrylate bifunctional linker 5-15 parts by weight, vinyl silane surface modified SiO2 nanoparticles 2-5 parts by weight, triaryl sulfonium hexafluoroantimonate cationic initiator 0.1-1 part by weight, and TPO free radical photoinitiator 0.5-4 parts by weight. According to the embodiment of the application, the silicone modified epoxy acrylate bifunctional linker in the coating layer realizes active chemical bonding between the optical fiber coating layer and the alicyclic epoxy resin sheath, reduces the physical gap and thermal stress mismatch of the multi-material interface, and thus can fundamentally improve the interface strength, internal insulation performance and long-term reliability of the optical fiber insulator.

The application provides a composite tungsten steel die and a preparation method, and comprises a composite structure with a radial gradient distribution, which at least comprises an inner working area, an intermediate transition area and an outer supporting area which are sequentially compounded, and the component content of the inner working area, the intermediate transition area and the outer supporting area continuously changes in a gradient manner. The hardness of the material gradually decreases from the inside to the outside, and the toughness gradually increases, so that the stress / strain field can be smoothly transmitted and distributed when the die bears a working load such as drawing, and stress peaks are avoided on a single interface, so that the material performance smoothly transitions from super-high hardness, high wear resistance to high hardness, high toughness, and then to high toughness and high strength from the inside to the outside.

This invention discloses a method for preparing epoxy resin, comprising the following steps: uniformly mixing a toughening agent and a curing agent to obtain a compound, wherein the curing agent is methylhexahydrophthalic anhydride and the toughening agent is ZIF-8; preheating bisphenol A type epoxy resin E51 at 60-80℃ for 15-20 min to obtain a pretreated epoxy resin; mixing the pretreated epoxy resin with the compound at 60-80℃; adding a defoamer and an accelerator under stirring; reacting at a constant temperature of 60-80℃ for 5-8 min to obtain a mixture; vacuum degassing the mixture, curing, and demolding to obtain the epoxy resin. The preparation method of this invention utilizes the synergistic effect of 2,4,6-tris(dimethylaminomethyl)phenol and ZIF-8 to toughen the epoxy resin, resulting in an epoxy resin with excellent mechanical properties, with an impact strength reaching up to 28.24 KJ / m². 2 .

The application relates to the technical field of plastic packaging film, and particularly discloses a recyclable PE wrapping film and a preparation method thereof. The recyclable PE wrapping film comprises the following raw materials: PE recyclable material, ethylene-propylene-diene rubber, active phenolic resin, metal halide, metallocene POE, HDPE resin, tackifying masterbatch, and the balance of LLDPE resin; the preparation method is as follows: the LLDPE resin is mixed with the PE recyclable material and the ethylene-propylene-diene rubber, hot melting, the active phenolic resin and the metal halide are added from the side feeding, hot melting, and a melt is prepared; the melt is cast and cooled to prepare a cast sheet, the cast sheet is drawn and stretched, and then subjected to corona treatment, curling and slitting. The recyclable PE wrapping film does not add opening agents, slip agents and anti-fog agents, ensures that the product is easy to recycle, the recyclable material has high purity, a high content of PE recyclable material is added, and the recyclable PE wrapping film still has relatively high tensile strength, puncture resistance and transparency.

The invention relates to a foam concrete material capable of quickly responding to a dry environment and a prefabricated slab. The high-strength concrete is prepared from the following raw materials in parts by mass: 300 to 600 parts of cement, 150 to 300 parts of blast furnace slag, 20 to 50 parts of anhydrous calcium sulfate, 50 to 200 parts of micro-active aggregate, 7 to 10 parts of polypropylene fiber, 5 to 7 parts of polystyrene fiber, 100 to 300 parts of regenerated micro powder, 0.2 to 1 part of nano foaming agent, 2 to 6 parts of polycarboxylate superplasticizer mother liquor, 10 to 50 parts of AFt seed crystal and 0.1 to 0.2 part of hydroxypropyl methyl cellulose. According to the foam concrete prefabricated slab, part of cement is replaced by the recycled micro powder and the slag, and meanwhile, the micro-active aggregate is compounded with the AFt seed crystal, so that the problem that the shrinkage period of the foam concrete prefabricated slab is long is effectively solved, the utilization rate of solid waste resources is also increased, and the problem that the strength of foam concrete in the prior art is relatively low is solved.

The invention relates to a tungsten-copper composite material forming part and a preparation method thereof, and belongs to the technical field of metal composite materials. The raw materials of the forming part are composed of a tungsten source, a copper source and a forming agent. The tungsten source consists of modified tungsten powder and tungsten powder; the modified tungsten powder is obtained by adding a reinforcing phase and an activating element, wetting and adhesion of a tungsten phase and a copper phase can be promoted, the sintering performance of the formed part is improved, and the comprehensive performance of the formed part is improved; the forming agent is added to ensure that the powder has good flowability and formability, the problems that a large-size tungsten-copper blank is poor in compression molding formability and high in manufacturing cost are solved, and a tungsten-copper composite material formed part which is uniform in structural component, low in cost and easy to form is obtained. The preparation method comprises the following steps: dispersing an activating element and a reinforcing phase into tungsten powder through a ball milling method to obtain modified tungsten powder, adding double-granularity composite powder of the modified tungsten powder and unmodified tungsten powder into a forming agent to obtain easily-formed composite powder, and pressing the composite powder into a large-size tungsten copper green body, the method has the characteristics of low cost, good repeatability, controllable process, raw material saving and the like.

The present application relates to the technical field of adhesive, and discloses a kind of flame-retardant polyurethane hot melt adhesive and preparation process, the present application is added to dry polyol, tackifying resin in reaction kettle, after heating stirring, add diisocyanate in nitrogen atmosphere, stirring reaction, then add polystyrene flame retardant, catalyst, defoaming agent, antioxidant, obtain flame-retardant polyurethane hot melt adhesive.The polystyrene flame retardant contains phosphate, melamine ring and a large number of benzene ring structure, forms intumescent flame retardant, and has good flame-retardant effect.The compatibility and interfacial strength of polystyrene flame retardant and polyurethane hot melt adhesive are high, the influence of flame retardant on the mechanical properties of hot melt adhesive is reduced, and the flame retardant contains high-strength polystyrene molecular chain, which is beneficial to improve the mechanical strength of hot melt adhesive, so that the hot melt adhesive has good peel strength and tensile properties.

The application discloses a copper-photosensitive polyimide film with excellent interface strength and a preparation method and application thereof, and relates to the technical field of integrated circuit packaging materials.The copper-photosensitive polyimide film with excellent interface strength prepared by the application reduces the formation of initial holes and pinholes, and reduces the residual stress and the risk of blistering through the improvement of the polar surface energy and the introduction of the uniform nucleation mechanism.Compared with the traditional strong chemical roughening and thick glue layer scheme, the application realizes a better balance among the adhesion strength, the humidity and heat / welding reliability, the micro-line adaptability and the high-frequency dielectric loss.The technology is particularly suitable for application scenarios such as high-density interconnection, 5G / 6G radio frequency flexible antenna, folding display and wearable devices, and these fields have put forward the requirements of compatibility for the thinness, high toughness, high stability and low dielectric loss of the substrate material.