36results about How to "Delayed cracking time" patented technology

The invention provides a preparing method for polycarboxylate water reducing agent. The polycarboxylate water reducing agent composed of, by weight, 30%-55% of deionized water, 35%-50% of polyoxyethylene ether, 5%-10% of carboxylic acid derivatives monomer, 0.0005%-0.002% of catalyst, 1.5%-4.5% of initiator, 0.2%-0.8% of chain transfer agent, 1.0%-2.5% of structure modifying agent and 4.5%-8.5% of alkali liquor. Under the temperature of 20-35 DEG C, the deionized water and the polyoxyethylene ether are enabled to be put in a reaction still to be dissolved, after the deionized water and the polyoxyethylene ether are fully dissolved, the carboxylic acid derivatives monomer, the catalyst, the initiator, the chain transfer agent and the structure modifying agent are enabled to be added in sequence, after stirring for 28-32 minutes, the mixed liquor still standings for 4-6 hours under room temperature, the alkali liquor is added in under a state of stirring, a potential of hydrogen (PH) value is adjusted to be 6.0-7.5, and then products are achieved.

To provide a tube which is particularly well matched to the specific demands imposed in special application areas, such as for example hydropyrolysis, the invention proposes a composite tube having a first part-tube and a second part-tube, in which—one part-tube is arranged in the other part-tube,—the first part-tube is a centrifugally cast tube, and—the second part-tube has been produced by pressure treatment from a powder.

A method for manufacturing the electric transmission line post without pull cable A high-strength antiwear composite wood-plastics board is composed of an artificial core board with two adhesive layers on its both surface, and two veneers adhered respectively onto said two adhesive layers. Said veneer is chosen from high-density plywood, polyhydroamine solution immersed paperboard, and PCC plate. Said adhesive is chosen from MVF adhesive, high-adhesion emulsion adhesive and universal adhesive. Proportionally mixing cement, water, sand, broken stone and steel fibers, binding a skeleton with reinforcing bars, loading the skeleton in a mould, pouring said mixture in said mould, closing the mould, centrifugal shaping at a gradually increased rotation speed, and ordinary-pressure steam curing. Its product has no cracking.

The invention discloses a long-service-life, safe and reliable forging cast iron die for a pig casting machine and a manufacturing method of the long-service-life, safe and reliable forging cast iron die. The forging cast iron die is integrally formed based on a forging technology, at least two separating ribs lower than a high-temperature molten iron liquid face are arranged in the forging cast iron die, an inner die cavity of the forging cast iron die is divided into at least three forming die cavities by the separating ribs, a lap joint mouth Q used for being in lap joint with an adjacent forging cast iron die is arranged at the lower end of the forging cast iron die, a cast iron die tail P corresponding to the lap joint mouth at the lower end of the adjacent forging cast iron die is arranged a the upper end of the forging cast iron die, at least two overflow openings are formed in the lap joint mouth Q, and molten iron protection edges M1 and M2 and lug portions T1 and T2 connected with a chain plate are arranged on the two sides of the forging cast iron die. The poor cast condition metallographic structure and various forging defects of a forging forming cast iron die are avoided and overcome through the forging cast iron die, the thermal fatigue resisting strength of the cast iron die is effectively improved, the safe reliability of the cast iron die is improved, and the service life of the cast iron die is prolonged.

The invention relates to the technical field of municipal domestic wastewater and sludge treatment and specifically discloses a combined ultrasonic whirl and disintegration process for surplus sludge.The process comprises the following steps: after carrying out gravity sedimentation and concentration on surplus sludge generated by a secondary sedimentation tank of a municipal sewage treatment plant, disintegrating the surplus sludge under the action of a strong whirl shear flow field to form small flocs; then, realizing the crushing of microorganism cell walls under the action of ultrasonic cavitation; and releasing intercellular and extracellular polymers and intercellular organic matters into a water body to facilitate the subsequent recycle of a carbon source, so that the reduction ofthe surplus sludge is realized. By using the combined ultrasonic whirl and disintegration process, the disintegration rate of the sludge is increased, the disintegration time of the surplus sludge isshortened, the problem that the overmuch surplus sludge is difficult to treat is effectively solved, the transportation cost of the sludge is reduced, the operation costs of sludge treatment and sewage treatment are reduced as a whole, and the combined ultrasonic whirl and disintegration process has high environmental and economic benefits.

The invention discloses an underground continuous wall with a prefabricated concrete-filled steel tube composite structure and a method for constructing the underground continuous wall. The underground continuous wall comprises a plurality of prefabricated connecting wall sections. The prefabricated connecting wall sections are vertically sequentially connected with one another and comprise concrete-filled steel tube composite members and external cast-in-place box-type concrete structures, rectangular steel tubes are arranged on the outsides of the concrete-filled steel tube composite members, concrete is arranged inside each concrete-filled steel tube composite member, the steel tubes are provided with binding bars at certain intervals, the binding bars are made of high-strength bolts, the protruded concrete-filled steel tube composite members of the wall sections are connected with one another by bolts, high-strength non-shrink grouting materials are poured in joints to form bond zones, prestressed steel strands are arranged inside the box-type concrete structures, slits are formed in the middle or two sides of each end of each connecting wall section, connecting steel plates are embedded among slit sections, slurry is poured in the wall sections after the wall sections are washed, and then the wall sections are integrally connected with one another. The underground continuous wall with the concrete-filled steel tube composite structure and the method have the advantages of good mechanical property, leakage resistance, reliability in connection, capability of implementing industrial production, and the like.

The invention relates to a water pipe reinforcing rib type cooling wall. The cooling wall is provided with a cooling water pipe, the cooling water pipe is arranged on a cooling wall body, a protection pipe is arranged at an inlet and an outlet of the cooling water pipe, and net-shaped reinforcing ribs are fixedly laid above and below the cooling water pipe and are respectively an upper-layer net-shaped reinforcing rib and a lower-layer net-shaped reinforcing rib; and the net-shaped reinforcing ribs are composed of a plurality of longitudinally-arranged ribs and a plurality of transversely-arranged ribs, the longitudinal ribs and the transversely-arranged ribs intersect with each other, and the intersection points are fixedly connected. The upper-layer net-shaped reinforcing ribs and the lower-layer net-shaped reinforcing ribs are laid above and below the cooling water pipe, the effect of fixing the water pipe is achieved, the tensile strength of the cooling wall body is improved, and the cooling wall body can bear large force without cracks; and the cracking time of the cooling wall is delayed in the using process of a blast furnace, an internal water pipe is protected against small strain stress, so that the service life of the cooling wall is prolonged, and the overall service life of the blast furnace is prolonged.