106results about How to "Improve surface strength" patented technology

The invention discloses a whisker carbon nanotube doped sulfonated polyetheretherketone water lubricated bearing material and a preparation method, and belongs to the technical field of high polymer materials, and the preparation method comprises the steps of dispersion of whisker carbon nanotubes, doping of the whisker carbon nanotubes, carbon fibers and graphite, cold press molding, sintering and the like. Hydrophilic sulfonic acid groups and whisker carbon nanotubes with branched structures are introduced into the sulfonated polyether-ether-ketone material, so that the sulfonated polyether-ether-ketone material effectively adsorbs hydrated cations in seawater, a hydrated lubricating layer is formed on the surface of the material, and interfaces of graphite, carbon fibers and polymers doped in the material are bridged and toughened. Besides, the whisker carbon nanotubes are dispersed by means of an alkylbenzene sulfonate dispersant, so that sulfonic acid groups can interact with the whisker carbon nanotube surface dispersant, the binding property of the polyether-ether-ketone material and the whisker carbon nanotubes is enhanced, and the surface strength of the material can be improved. Therefore, the problems that an existing polyether-ether-ketone composite material is poor in bearing capacity and serious in abrasion at a low rotating speed are solved.

The invention relates to a production process of a high-elasticity heat-resistant polyester yarn, which comprises the following steps: firstly, selecting high-molecular-weight polyethylene glycol terephthalate, adding 1-3% of nano filler and 5-10% of functional copolymer, and drying at 150 DEG C for 4-6 hours to improve the stability and processability of the material; secondly, melt extrusion is conducted at 280-290 DEG C, spinning is conducted through a multi-section temperature control spinning head, and the fiber cooling uniformity is effectively controlled. Then, two times of drafting and a heat setting process are adopted, the orientation degree of a molecular chain is improved in one time of drafting, and low-temperature plasma treatment is combined to optimize the surface activity and the setting effect of the fibers. In the secondary drafting, the fiber deformation is finely adjusted at low temperature, the thermal damage is reduced, the elasticity is improved, and finally, xylanase treatment and ultraviolet curing are combined, so that the softness, the skin-friendly property and the weather resistance of the fiber are remarkably improved.

The invention provides salt-spray-resistant steel, a preparation method and application of the salt-spray-resistant steel. The salt-spray-resistant steel sequentially comprises an alloy matrix, a permeable layer and an anti-corrosion coating from inside to outside. The alloy matrix comprises an Fe element; the permeable layer comprises Fe, N and O elements; the anticorrosive coating covers at least the surface of the permeable layer. The steel has the characteristics of high strength and salt spray resistance, the binding force of the coating and a matrix is good, the thickness of the anti-corrosion coating is greatly reduced under the condition that the anti-corrosion requirement of the CX grade is met, the machinable performance of a workpiece is effectively improved, and the adverse effects that the workpiece meshing force is poor, and the surface is not uniform due to the thick coating are avoided.

The invention relates to the technical field of concrete preparation, and discloses machine-made sand concrete and a preparation process thereof.The machine-made sand concrete comprises broken stone, machine-made sand, cement and water according to a conventional ratio, the cement is slag cement, and the slag cement comprises, by weight, 20-25 parts of steel slag, 18-32 parts of blast furnace slag, 2-4 parts of water, 1-3 parts of a water reducing agent, 1-3 parts of a water reducing agent and 1-3 parts of a water reducing agent. And 6-12 parts of Portland cement clinker. The prepared machine-made sand concrete is good in anti-permeability and anti-carbonization capacity, the chemical corrosion resistance and bonding strength of the machine-made sand concrete are improved through the added barium sulfide industrial waste residues, and the machine-made sand concrete has the long service life. The invention solves the industrial technical problems in preparation of green high-performance concrete from machine-made sand and industrial waste residues, and breaks through the common key technical problems of high-efficiency production regulation and control of machine-made sand and the like.

The invention provides a cast iron sand mold coating and a preparation method thereof, and relates to the field of casting sand mold coatings. The cast iron sand mold coating is composed of the following raw materials: a fireproof filler, a liquid carrier, a suspending agent, a binder and an auxiliary agent. The raw materials comprise, by weight, 65-70% of the fireproof filler, 19-25% of the liquid carrier, 2-4% of the suspending agent, 4.4-5.5% of the binder and 2.4-3% of the auxiliary agent; the refractory filler is composed of magnesia powder, zircon powder and graphite powder; the magnesia powder is composed of light magnesia powder and heavy magnesia powder. According to the cast iron sand mold coating and the preparation method thereof, the problems that an existing shielding type coating is thin in anti-sulfuration coating thickness, poor in anti-sulfuration coating stability, general in anti-sulfuration effect and large in gas forming amount can be effectively solved, poor spheroidization and casting defects of castings are effectively avoided, the production cost is reduced, and the stability of the castings is improved.

The invention relates to the field of thin film materials, and particularly discloses an environment-friendly water-based release agent, a water-based release film and an implementation method of the water-based release film. The environment-friendly water-based release agent comprises modified acrylic resin and a coating composition which are matched with each other for use, the modified acrylic resin is prepared from the following raw materials: self-crosslinking acrylic resin, an acrylate copolymer and an antioxidant; the coating composition comprises the following raw materials: a hydroxyl acrylic acid copolymer dispersion, a water-based slipping wear-resistant agent, a curing agent, a water-based drier and deionized water. According to the water-based release film, the modified acrylic resin is used for prime coat, the acrylic resin is modified, the surface strength and the stability of the release film can be improved by matching the modified acrylic resin with the hydroxyl acrylic acid copolymer dispersion, and the parameters such as stripping force, fastness and stability of the water-based release film can reach the standards of an existing organic silicon release film; and meanwhile, only a very small amount of VOC waste gas is generated, so that the method is environment-friendly and low in cost.

The invention discloses an anti-settlement subgrade layered filling structure and a construction method, the anti-settlement subgrade layered filling structure comprises soft rock filler layers, a silty sand layer is filled every other soft rock filler layer with a fixed thickness, and a composite geomembrane is laid on the silty sand layer; the composite geomembrane sequentially comprises a curing layer and a drainage layer from bottom to top, the curing layer comprises a plurality of reinforcing units distributed in an array mode, each reinforcing unit comprises an upper layer and a lower layer which are filled with urease and cementing liquid respectively, the urease and the cementing liquid are sealed through the geomembrane, a trigger device is arranged in the upper layer, and the drainage layer is arranged in the lower layer. When the roadbed is settled, the trigger device moves downwards along with the roadbed to solidify the settled part; the drainage layer comprises a capillary drainage structure and is used for transversely guiding water out to the side slope. All the structural layers are matched with one another, outside water is prevented from entering a soft rock filling layer, meanwhile, the drainage capacity of the soft rock roadbed is greatly improved, the disintegration and softening effects of rainwater on soft rock are reduced, the service life of the soft rock roadbed is prolonged, the long-term stability of the roadbed is improved, and applicability is high.

The utility model discloses an explosion-proof oil-immersed current transformer, which belongs to the technical field of oil-immersed current transformers and comprises an insulating porcelain bushing, a flange A is mounted at the bottom end of the insulating porcelain bushing, an expander is mounted at the top end of the insulating porcelain bushing, an oil tank is mounted at the bottom of the flange A, a flange B is mounted at the top of the oil tank, and the flange B is mounted at the bottom of the oil tank. And two sides of the outer wall of the flange B and two sides of the outer wall of the flange A are respectively provided with an annular sealing element. The structure is reasonable, through the arrangement of the annular sealing elements and the protective coating mechanism, the flange B on the oil tank is assembled on the flange A below an insulating porcelain bushing on the oil-immersed current transformer, and the oil-immersed current transformer is assembled on the oil tank through the annular sealing elements; and the annular sealing element is matched with the sealing ring A and the sealing ring B to seal the flange A and the flange B, so that leakage at the mounting position of the oil tank and the insulating porcelain bushing after mounting is avoided as much as possible, the sealing aspect is guaranteed, and the possibility that the oil-immersed current transformer is easy to explode is effectively reduced.

The invention discloses a light reinforced perovskite solar cell module and a production process thereof, and relates to the technical field of solar cells, and the light reinforced perovskite solar cell module structurally comprises a high-transmittance epoxy resin adhesive protection layer, a substrate, a perovskite cell layer, an adhesive film layer and a back plate which are sequentially stacked. The peripheries of the substrate, the perovskite cell layer, the adhesive film layer and the backboard are sealed. According to the perovskite solar cell module, the epoxy resin adhesive protection layer is arranged on the light incident surface of the perovskite solar cell module, so that the inner-layer substrate can be effectively protected, heat transfer can be effectively blocked by utilizing the heat insulation characteristic of the epoxy resin adhesive protection layer, and the purposes of reducing the overall temperature of the module and relieving the thermal decomposition of perovskite are achieved; therefore, the service life of the perovskite solar cell module is prolonged.

The invention belongs to the technical field of polyurethane coatings, and provides a cellulose nanocrystal enhanced heat-insulating bio-based polyurethane coating and a preparation method thereof, according to the coating, porous cellulose nanocrystals are introduced, and a silicon dioxide film is deposited on the surfaces of the porous cellulose nanocrystals, so that the heat-insulating property, weather resistance and mechanical property of the material are remarkably improved. The castor oil adopted as a bio-based raw material has the advantages of being renewable and environmentally friendly, and the defects of a traditional petroleum-based polyurethane material in the aspects of environmental protection and resource consumption are overcome. Through epoxidation treatment on castor oil, the reaction activity and hydroxyl density of the material are increased, and further fluorination and silanization modification are performed, so that the hydrophobicity, chemical stability and surface energy reduction effect of the coating are effectively improved; the prepared bio-based polyurethane coating has excellent mechanical properties, long-acting weather resistance and an excellent heat reflection effect.

The invention discloses a starch-based surface sizing agent as well as a raw material composition, a preparation method and application thereof. The starch-based surface sizing agent comprises the following raw materials in parts by weight: 30-70 parts of a hard monomer, 20-60 parts of a soft monomer, 11-6 parts of a functional monomer, 22-10 parts of a functional monomer, 0.5-3.0 parts of an acid catalyst, 70-90 parts of native starch, 5-20 parts of polyol and 3-7 parts of an initiator. According to the invention, through the reaction of the polyhydric alcohol and the native starch, the surface strength of the raw paper can be greatly improved, meanwhile, linting and dusting are reduced, and the sizing degree, smoothness and printability of paper can be effectively improved. And during monomer graft copolymerization, functional monomers are introduced, so that the Cobb value of raw paper can be obviously improved while the cross-linking capability of the surface sizing agent and paper pulp fibers is further improved. According to the invention, modified starch is replaced by native starch, and polyhydric alcohols and functional monomers are added, so that the product can be applied to paper pulp with different qualities, and the water resistance of paper is obviously improved.

The invention discloses charcoal recycled concrete and a preparation method thereof, and belongs to the technical field of building materials. The biochar recycled concrete provided by the invention is prepared from the following components in parts by mass: 400 to 420 parts of cement, 40 to 50 parts of biochar, 600 to 620 parts of natural sand, 1000 to 1200 parts of recycled coarse aggregate and 200 to 210 parts of water, the recycled concrete has high compressive strength and high carbon sequestration amount, and the carbon sequestration capacity of the recycled concrete is greatly improved. The preparation method is simple and convenient, materials are easy to obtain, production is easy, and the method has excellent industrial prospects.

The invention relates to the technical field of paper surface treating agents, in particular to a surface sizing agent for papermaking and a preparation method thereof. The invention relates to a surface sizing agent for papermaking. Comprising the following preparation raw materials: 48-52 parts of cationic starch, 2-2.5 parts of modified nano silicon dioxide, 5-6 parts of modified nano cellulose, 50-55 parts of styrene, 48-55 parts of a cationic acrylate monomer, 6-7 parts of hydroxyethyl acrylate, 5-6 parts of a cationic emulsifier, 4.5-5.0 parts of an antibacterial agent, 4-5 parts of an initiator solution with the mass concentration of 4%, and 450-480 parts of water, the antibacterial agent is chitosan modified cortex phellodendri powder. The surface sizing agent disclosed by the invention has the advantages of environment friendliness, economy and the like while improving the performance of paper, and has a wide application prospect.

The invention discloses a toughened waterproof gypsum composition and a preparation method thereof. The toughened waterproof gypsum composition comprises the following components in parts by weight: 80-250 parts of gypsum powder, 54-150 parts of heavy calcium carbonate powder, 60-95 parts of talcum powder, 75-175 parts of light calcium carbonate powder, 80-105 parts of ash calcium powder, 15-55 parts of melamine powder, 25-65 parts of cellulose, 35-85 parts of a retarder, 70-95 parts of a water repellent and 70-95 parts of a toughening agent. A proper amount of a water repellent and a flexibilizer are added in the preparation of the gypsum composition, the water repellent is organic silicon hydrophobic powder, and the organic silicon hydrophobic powder is ternary fine particles and is composed of a powder carrier, a colloid coating material and an organic silicon active component easy to disperse. The colloid wrapping material can stably preserve the active components in the powder and can be timely released after water is added, the dispersity of the organic silicon hydrophobic powder in water is good, and the hydrophobic performance of the material can be improved; and the flexibilizer is used for improving the brittleness of the gypsum and improving the impact resistance of the gypsum.

This invention discloses a sulfonated polyether ether ketone (PEEK) water-lubricated bearing material doped with whisker carbon nanotubes and its preparation method, belonging to the field of polymer materials technology. The method includes steps such as whisker carbon nanotube dispersion, doping with whisker carbon nanotubes, carbon fibers, and graphite, cold pressing, and sintering. By introducing hydrophilic sulfonic acid groups and branched whisker carbon nanotubes into the sulfonated PEEK material, the material effectively adsorbs hydrated cations from seawater, forming a hydrated lubricating layer on the material surface. Furthermore, the doped graphite, carbon fibers, and polymer interfaces within the material provide bridging and toughening. In addition, by dispersing the whisker carbon nanotubes using an alkylbenzene sulfonate dispersant, the sulfonic acid groups interact with the surface dispersant, enhancing the bonding between the PEEK material and the whisker carbon nanotubes and improving the surface strength of the material. This solves the problems of poor load-bearing capacity and severe wear at low speeds in existing PEEK composite materials.

A micro-reinforced concentric twist drill. Concentric drilling and micro-reinforcing technologies are applied to cutting faces of the twist drill, and upright micro-reinforced center drills (2) are symmetrically arranged on helical cutting faces (5) on two sides of an axial central area, and extend to the rear cutting face (5) and form drill center hole cutters (13) in a protruding manner; a micro-reinforced central cutting face (1) is arranged on the inner side of each micro-reinforced center drill (2) in a protruding manner, and the micro-reinforced central cutting face (1) extends to the axial front and intersects with the rear cutting face (5) to form a micro-reinforced central drilling edge (14) of the micro-reinforced concentric twist drill; and / or upright micro-reinforced reamers (12) are symmetrically arranged on central areas of the helical cutting faces (5) on two sides of the axial center in an integral manner; a protruding reaming cutting face (3) is formed on the inner side of each micro-reinforced reamer (12); the reaming cutting face (3) extends to the front and intersects with the rear cutting face to form a reaming cutting edge (9); and / or on two sides of the micro-reinforced concentric twist drill, in an integral manner, micro-reinforced wear-resistant grooves (16) are arranged on the helical cutting faces respectively in directions from helical cutting edges (10) to the axial center on the inner side in a recessed manner. The micro-reinforced twist drill can improve the cutting efficiency and prolong the service life.

The invention relates to a composite board and a unit wall coupling structure comprising the composite board. The structure comprises a vertical-horizontal frame structure, the vertical-horizontal frame structure comprises vertical rods and horizontal rods, and a quadrilateral frame is formed and used for installing the composite board. The vertical rod comprises an upper vertical rod and a lower vertical rod which are connected through an expansion joint at the portion where the channel layer is formed. The structural design is used for construction without a retaining wall, has excellent attractiveness and strength, can prevent whitening and dew formation, can be produced in batches, reduces the manufacturing cost and shortens the construction time.

The present invention relates to a waterproof, moisture-proof and mildew-proof construction process for a basement, which is characterized in that it comprises the following steps: Step 1, cleaning the walls and the floor of the basement; Step 2, detecting whether the walls and the floor of the cleaned basement are flat; Step 3, drying the walls and the floor of the basement, and then coating the spacer primer; Step 4, after the spacer primer is dried, coating the surface of the spacer primer with a waterproof topcoat; Step 5, curing and drying until it is completely solidified, that is, completing the construction. The present invention adopts an environmentally friendly water-based double-layer coating for the waterproof construction of the basement. Among them, the spacer primer is an epoxy water-based coating, which is a varnish coating with strong adhesion, so that it has good adhesion with concrete; the waterproof topcoat is an acrylic water-based coating with a new formula, which not only has excellent waterproof properties, but also has high strength and good mildew resistance.

A preparation method of a composite concrete moisture evaporation inhibitor comprises the following steps: putting 2500-4500 parts by mass of water glass with the concentration of 40%, 40-80 parts by mass of sodium nitrite and 15-25 parts by mass of triethanolamine into a container, heating to 40 DEG C, and stirring for 30 minutes; continuously adding 400-600 parts by mass of sodium methylsilanolate into the mixture, keeping the temperature at 40 DEG C, and continuously stirring for 30 minutes to obtain a mixture A; 60-100 parts by mass of sodium fluosilicate and 400-800 parts by mass of urea are taken and dissolved in 3000-6000 parts by mass of purified water, the mixture is heated to 40 DEG C and stirred for 30 min, and a mixture B is obtained; adding the mixture A into the mixture B, and continuing to stir for 40 minutes to obtain the composite concrete water evaporation inhibitor, the inhibitor provided by the invention has the characteristics of water resistance and high permeability after film formation, meanwhile, the surface strength and anti-carbonization capacity of concrete are improved, and a better water evaporation inhibition effect is achieved.

The utility model relates to the field of electric wires, in particular to an anti-puncture shielding electric wire. Comprising a conductor, an insulating layer, an anti-puncture layer, a metal braid layer and a sheath layer, the conductor, the insulating layer and the anti-puncture layer are sequentially lapped from inside to outside to form an insulating wire core, at least one insulating wire core is coated with the metal braid layer, and the metal braid layer is lapped with the sheath layer; the thickness of the anti-puncture layer ranges from 0.02 mm to 0.2 mm. According to the utility model, the anti-puncture layer structure is additionally arranged, the anti-puncture layer is made of a material with hardness higher than that of the insulating layer, and synchronous extrusion and tight adhesion are realized, so that the surface strength of the insulating layer can be improved, the risk of short circuit caused by puncturing the insulating layer by metal wires is effectively improved, the driving safety is guaranteed, and the service life of the product is prolonged.

The invention discloses a high-performance 35CrMo steel stud based on a subcritical quenching process. The high-performance 35CrMo steel stud comprises a steel stud body and a composite laser cladding layer arranged on the surface of the steel stud body, the steel stud body is prepared from the following components in percentage by mass: 0.32 to 0.40 percent of C, 0.17 to 0.35 percent of Si, 0.42 to 0.63 percent of Mn, 0.93 to 1.08 percent of Cr, 0.17 to 0.25 percent of Mo, 0.14 to 0.28 percent of Ni, 0.09 to 0.25 percent of Ti and the balance of Fe and inevitable impurities. The heat treatment process based on subcritical quenching is adopted, the self-made quenching liquid is matched, the ultrasonic effect is assisted, the toughness of the 35CrMo steel stud can be remarkably improved, and meanwhile the 35CrMo steel stud has high strength; and a laser cladding surface treatment process is further combined, so that the surface strength, wear resistance and high temperature resistance of the steel stud can be greatly improved.

The invention discloses a fireproof adhesive tape for protecting a coil and a preparation method thereof, and relates to the technical field of fireproof adhesive tape, the adhesive tape comprises a base material layer and an adhesive layer, the base material layer comprises the following raw materials: polyurethane, glass fiber, modified boron nitride nanotubes, a flame retardant, a cross-linking agent, a defoaming agent, an auxiliary agent and water; wherein the modified boron nitride nanotubes comprise boron nitride nanotubes, carboxymethyl cellulose sodium and hyaluronic acid in a mass ratio of 5: 6: 6, the boron nitride nanotubes are modified, so that the distribution uniformity of the boron nitride nanotubes can be greatly improved, sodium ether salt is formed on the surfaces of the boron nitride nanotubes, and the stability, strength and flame-retardant and fireproof effects of the base material layer are improved; therefore, the fireproof adhesive tape for protecting the coil has higher flame-retardant and fireproof performance.

The utility model discloses high-strength glassine paper which comprises a second thin film layer, a second paper pulp layer arranged on the second thin film layer, an elastic layer arranged on the second paper pulp layer, a first paper pulp layer arranged on the elastic layer, a first thin film layer arranged on the first paper pulp layer and a waterproof layer arranged on the first thin film layer, the reinforcing ribs are arranged in the first paper pulp layer and the second paper pulp layer, the elastic layer is located between the first paper pulp layer and the second paper pulp layer, and the first paper pulp layer and the second paper pulp layer are covered with the first thin film layer and the second thin film layer respectively. According to the high-strength glassine paper, the reinforcing ribs are arranged in the first paper pulp layer and the second paper pulp layer, and meanwhile, the honeycomb structure is adopted, so that the strength of the paper is improved, and the pressure resistance is also improved; the flexible traction strip is arranged in the elastic layer, so that the flexibility of the paper is improved; the waterproof layer is made of fluorocarbon resin, so that the surface strength and the water resistance of the paper can be improved.

The present disclosure relates to a glass composition, a glass article, a method of manufacturing the glass article, and a display device. The glass article includes the glass composition including 60 mol% to 70 mol% of SiO2, 5 mol% to 15 mol% of Al2O3, 5 mol% to 15 mol% of Na2O, greater than 0 mol% and equal to or less than 5 mol% of K2O, 5 mol% to 15 mol% of Li2O, and greater than 0 mol% and equal to or less than 5 mol% of MgO based on the total amount, and the glass composition satisfies the following relational expression (1): 0.1 < = Al2O3 / (the sum of Na2O, K2O, and Li2O) < = 0.7 relational expression (1), wherein Al2O3, Na2O, K2O, and Li2O in relational expression (1) indicate molar percentage (mol%) contents of Al2O3, Na2O, K2O, and Li2O, respectively, in the glass composition, and the glass article has a thickness of 100 [mu] m ([mu] m) or less.

The invention discloses a large-specification plane plate machining method, and belongs to the technical field of plate machining. The method comprises the following steps that firstly, a plate blank is selected, and the plate blank is fed and clamped to a machine tool; 2, machining parameters of a machine tool are set, the plate blank is machined to the corresponding size, and a plate is obtained; thirdly, the plate obtained in the third step is taken down and placed on a cleaning detection device; fourthly, a cleaning detection device is started, the plate face of the plate is cleaned, and the cutting fluid on the plate is cleaned; and fifthly, protective paint is sprayed to the surface of the plate, so that a protective coating is formed on the surface of the plate, and the plane plate is obtained. The overall processing technology is simple, the used protective coating is sprayed on the plane plate, and the obtained plane plate has excellent corrosion resistance and abrasion resistance, is high in surface strength and practicability and is applied to aerospace equipment.

The utility model relates to the technical field of aluminum alloy sections, in particular to a high-strength aluminum alloy section for a combined energy-saving curtain wall, which comprises a stand column, a plurality of rib columns distributed at equal intervals are arranged on the inner side of the stand column, and ribs are arranged on the periphery of each rib column. The cross beams are located on the front side and the rear side of the stand column, fixing cylinders are arranged on the inner sides of the cross beams, and reinforcing fins are fixedly connected between the peripheries of the outer surfaces of the fixing cylinders and the inner walls of the cross beams. Under the action of the rib columns, the ribs and the honeycomb fiber braid layer, the aluminum alloy profile has the advantages of high strength and large bearing load, and the problem that the aluminum alloy profile for the combined energy-saving curtain wall possibly has insufficient strength in certain specific application scenes is solved; in particular, in a large-span, high-wind-pressure or complex-modeling curtain wall system, most traditional aluminum alloy sections are designed into single cavities, and deformation is prone to occurring when large loads are borne.

A ceramic thin plate aluminum honeycomb composite panel system and its construction method, the system includes a composite panel, an anchoring assembly and an adhesive layer; the composite panel includes a ceramic thin plate, an insulation layer, a backing layer and an aluminum honeycomb panel; the ceramic thin plate includes a long side and a short side; the length of the aluminum honeycomb panel is the same as the length of the long side; the anchoring assembly is arranged on the composite panel; the adhesive layer includes an outer frame and an inner ring, and the number of the inner rings is at least six; the board edge of the composite panel is provided with a water vapor outlet; the adhesive layer is arranged on the right side of the backing layer. The method includes base inspection and acceptance, setting up a reference line, pasting the composite panel, installing the anchoring assembly, filling the caulking material, applying sealant and cleaning the board surface; the present invention adopts the bonding and anchoring method to effectively install the composite panel on the exterior wall, which can absorb construction errors, save adhesive materials, has high surface strength, low water absorption, good thermal insulation effect, and a wide range of anchoring points, and has a good ability to bear its own weight, which effectively eliminates the safety hazard of the composite panel falling off from high altitude.

The present invention belongs to the technical field of spacers for optical instrument lenses, and specifically to spacers for optical instrument lenses and a manufacturing method thereof, comprising an optical instrument body, a lens barrel being arranged on the surface of the optical instrument body, and a plurality of lens bodies being arranged on the inner side wall of the lens barrel. The spacers for optical instrument lenses and a manufacturing method thereof described in the present invention replace the traditional connection method using optical glue by setting a rotating snap-fit ​​connection component, and the connection stability will not be affected by temperature, which greatly guarantees the limiting stability of the lens and the spacer, and improves the stability and life of the lens of the optical instrument. At the same time, when one side is damaged, it can be quickly disassembled without having to replace all of them, thereby reducing the additional expenditure cost caused by the damage. The quick disassembly function allows researchers to quickly replace lenses or spacers of different specifications, thereby realizing flexible adjustment of the optical system.

The utility model relates to the field of car roof wheel assemblies, in particular to a car roof wheel assembly of a passenger elevator with a shallow pit and without a machine room. The technical problems that an elevator shakes and generates noise during use due to the fact that an existing car roof wheel assembly is poor in damping measure effect, an existing fixing assembly is simple and poor in stability when a rope wheel is fixed, the rope wheel is prone to being damaged by external force, and meanwhile the rope wheel is prone to being damaged due to the fact that the rope wheel is used for many times are solved. According to the technical scheme, the car roof wheel assembly of the passenger elevator without the machine room in the shallow pit comprises a car frame upper beam, a first damping mechanism, a channel steel mechanism, a second damping mechanism, a fixing mechanism and a rope wheel, the first damping mechanism and the second damping mechanism are arranged to conduct damping treatment on equipment, shaking and noise generated when the equipment is used are reduced, and the service life of the equipment is prolonged. And meanwhile, the rope wheel is reinforced and assembled through the fixing assembly, the overall stability is improved, meanwhile, the rope wheel is reinforced, the surface strength is enhanced, and the service life is prolonged.

The present invention provides a wear-resistant and stain-resistant UHPC white decorative board, a composition and a preparation method; the composition of the wear-resistant and stain-resistant UHPC white decorative board includes, by mass, 89-91 parts of white silicate cement, 8-15 parts of silane-modified white auxiliary cementitious material, 0.5-1.0 parts of organic silicon hydrophobic agent, 100-120 parts of stearic acid-modified white dolomite aggregate, 2.5-4 parts of liquid water reducer, 0.20-0.30 parts of liquid defoamer, 0.10-0.30 parts of anti-cracking fiber, and 18-22 parts of water. The UHPC white decorative board in the present invention has ultra-high performance, and it not only has good appearance quality, but also has excellent characteristics such as high strength and toughness, high density and high wear resistance, strong hydrophobicity and strong stain resistance.