5 results about "Shear strength" patented technology

The invention relates to a multi-purpose strippable acrylate adhesive microporous material and a preparation method of the material, in particular to an acrylate adhesive material and a preparation method of the material, and solves the problems of low shearing strength and stripping resistance of the existing acrylate adhesives. The adhesive microporous material is prepared from acrylate resin, foaming agent, foam stabilizer, thickener, plasticizer, cross-linking agent, isopropanol and filler. The preparation method comprises the following steps: (1) preparing raw materials of acrylate resin according to weight ratio; (2) adding each raw material component prepared in the step (1) in a reaction kettle under controlled dropping speed, and performing core-shell emulsion polymerization to obtain acrylate resin; and (3) sequentially adding acrylate resin and the rest of raw materials prepared in the step (2) in the reaction kettle, dispersing, drying, and transferring onto a substrate to obtain acrylate adhesive. The acrylate adhesive microporous material has the advantages of high shearing strength, and easy stripping, and is mainly applied to poster, wall sticker and adhesive on various decorative stickers.

The invention discloses an SPS connection method for tungsten and molybdenum dissimilar refractory metals. The SPS connection method is characterized in that blocky tungsten is taken as a base body, the base body and molybdenum powder are sintered and connected through an SPS technology, so that a connecting piece of the tungsten and molybdenum dissimilar refractory metal is obtained. According tothe SPS connection method, the molybdenum powder can be sintered and compacted on the tungsten base body, meanwhile, sintering connection of the tungsten and molybdenum metals is realized, so that the connecting piece with high strength and good forming effect is obtained, and the room temperature shearing strength of a joint can reach 152.9 MPa.

The invention relates to the technical field of marine polyurethane thermal insulation balance weight pipes, and discloses a hard polyurethane spraying prefabricated thermal insulation balance weight pipe with an anti-corrosion layer and a preparation method of the hard polyurethane spraying prefabricated thermal insulation balance weight pipe. The hard polyurethane spraying prefabricated thermal insulation balance weight pipe structurally comprises a steel pipe, the anti-corrosion layer, a polyurethane foam thermal insulation layer, an interface adhesive layer, a polyolefin protection layer, anti-skid particles, a concrete balance weight layer and a reinforcement steel wire mesh in sequence from inside to outside. A waterproof sealing rubber strip is bonded to the end of the anti-corrosion layer. The preparation method comprises the steps that the steel pipe coated with the anti-corrosion layer is conveyed to a polyurethane foam spraying line for spraying construction; the waterproof sealing rubber strip is bonded; an adhesive is wound, polyolefin is extruded, and the anti-skid particles are scattered; the pipe end of the polyolefin protection layer is finished after cooling; and weight balancing, finishing and maintaining of the thermal insulation pipe are carried out. The conditions of holes and uneven density cannot be generated, a pipe end waterproof cap does not need to be additionally mounted, and consistency of the pipe end and a main coating can be kept; and the shearing strength between the polyurethane foam thermal insulation layer and the polyolefin protection layer and the shearing strength between the polyolefin protection layer and the concrete balance weight layer are increased.

The invention provides a joint structure, a building body and a joint structure construction method, and relates to the technical field of building construction. The joint structure comprises a flexible first connecting rib and a flexible second connecting rib, wherein the first connecting rib and the second connecting rib are fixed in a first construction component and a second construction component on the two sides of a joint respectively; the first connecting rib is provided with an exposed first connecting part so as to form a first annular structure on the side wall of the joint of the first construction component; and the second connecting rib is provided with an exposed second connecting part so as to form a second annular structure on the side wall of the joint of the second construction component; and the first annular structure and the second annular structure are correspondingly communicated and/or distributed in a staggered mode. The first annular structure and the second annular structure can form a connecting bolt with a cementing material in the joint, the structure of the connecting bolt is similar to an anchoring bolt with an external thread, the anchoring strength between the connecting rib and the cementing material can be effectively enhanced, and therefore the tensile and shear strength of the joint structure can be effectively improved so as to narrow the joint.

The invention discloses an extrusion processing method of magnesium alloy AZ91D internal threads, and belongs to the field of material extrusion thread processing methods. The extrusion processing method solves the problem that the magnesium alloy extrusion thread processing technology is difficult. The extrusion processing method comprises the steps that after machining is conducted on a magnesium alloy AZ91D cast ingot, so that a magnesium alloy AZ91D bar material is obtained; the magnesium alloy AZ91D bar material is placed in the middle of an inner cavity of a die, and the two ends of thedie are tightly screwed and fixed in a threaded mode; then the die is put into a box type resistance furnace, and after the temperature is risen to range from 380 DEG C to 440 DEG C, the temperature is kept for 16-22 hours; after water cooling is accomplished, the bar material is clamped on the working plane of a machining center, and a hole position is formed in the center through drilling; a 45-degree chamfer is processed in a hole opening of a bottom hole, so that the magnesium alloy AZ91D bar material with the preformed bottom hole is obtained; and the magnesium alloy AZ91D bar material with the preformed bottom hole is processed by an extrusion tap in an extrusion mode under the condition of lubrication of an emulsion, the concentration of the emulsion is 6%, and the rotating speed ofa main shaft in the thread extrusion process is controlled to range from 30r/min to 80r/min, so that the magnesium alloy AZ91D internal threads are obtained. Compared with threads formed by cutting,the magnesium alloy AZ91D internal threads have the advantages that the tensile strength is increased by 20%-30%, and the shear strength is increased by 5%-10%.