33results about How to "Play a role in expansion" patented technology

The invention relates to a SiCp / EPS lost foam and a SiCp / Al casting forming technology and belongs to the technical field of casting. A preparation technology of the SiCp / EPS lost foam comprises the steps that 1 material mixing for preparation is conducted, wherein SiC particles, rare earth powder, EPS beads and adhesive are weighed and fetched according to volume parts, and the fetched SiC particles, rare earth powder, EPS beads and adhesive are evenly mixed; 2, after a mold is preheated to a work temperature, a next operation is performed; 3, the mixed materials are fed into the mold by means of compressed air, hot steam is fed, and pressure is kept; 4, hot steam is removed after pressure keeping is ended, water is sprayed to the back face of the mold for cooling so as to enable the moldto be cooled and enable the material temperature to be lowered to below a softening temperature, mold stripping is conducted after shaping, and then a SiCp / EPS lost foam pattern is obtained. The SiCp / Al lost foam casting forming technology adopts the prepared SiCp / EPS lost foam. The production efficiency is high, and the mechanical properties of a part can be improved.

The invention discloses a curing agent for deep stirring muddy soil, a preparation method and a use method thereof, and belongs to the field of muddy soil curing agents. Among them, the curing agent includes the following components by weight: 30-40 parts of cement, 30-40 parts of papermaking lime mud, 20-40 parts of magnesium-based substrate waste materials; the sum of the weight parts of the above-mentioned components is 100 parts; magnesium-based The MgO content in the sheet waste is ≥30wt%. The curing agent of the invention has high strength after curing and strong impermeability.

The invention relates to a composite cement expanding agent and a preparation method thereof. The composite cement expanding agent comprises 5-50mass% of quicklime, 20-50mass% of anhydrite, 5-40mass% of an aluminum-containing clinker, 5-20mass% of a metakaolin clinker, 2-15mass% of quartz powder and 0.1-1mass% of an organic additive. The expanding agent utilizes different aluminate mineral clinkers to adjust the expansion rate and increase the effective expansion; and the expanding agent also utilizes the organic additive to improve the expanding performance in a cement plasticity phase and well compensate the contraction in the cement hydration plasticity phase and the contraction after the later-stage hardening of cement. The alkali content of the expanding agent is lower than 0.5%, so the alkali aggregate reaction can be effectively avoided; and when the doping amount is 8%, results of detection according to JC476-2001 standard of the expanding agent show that the restrained expansion rate under the maintenance in air for 21d is greater than the standard, and especially the plastic phase expansion rate is 0.02-0.15%.

The invention relates to alcohol ether borate brake fluid. The alcohol ether borate brake fluid is prepared from the following raw materials in percentage by weight: 20-50% of triethylene glycol monomethyl ether borate, 10-45% of polyglycol monobutyl ether borate with the number-average molecular weight being 780, 10-40% of polyglycol monoether, 10-40% of multiethylene-glycol, 0-15% of triethylene glycol dimethyl ether, 0-3% of an antioxidant, 0-5% of a pH value adjusting agent, and 0-5% of a corrosion resister. According to the alcohol ether borate brake fluid disclosed by the invention, the problem that conventional alcohol ether borate brake fluid is unstable is solved, and the alcohol ether borate brake fluid has the following advantages of being high in resistance for air resistance, good in low-temperature fluidity, rustproof, anti-corrosion, good in adaptability to rubber parts and excellent in heat stability.

The invention provides an unsaturated spiro ring orthocarbonate expansion monomer, the synthesis method of which comprises the following steps: (1) weighing 6,8-dihydroxy-1-nonene, di-n-butyltin oxide and toluene, Add it into the reaction vessel and stir it, and react at 150±2°C; (2) Cool the reaction solution in the reaction vessel to room temperature, then add carbon disulfide dropwise to the reaction solution, and then heat the reaction solution to 110±2°C, Continue the reaction; (3) Cool the reaction liquid to room temperature, remove the toluene, wash, recrystallize, and dry in vacuum to obtain the unsaturated spiro ring orthocarbonate expanded monomer. The above-mentioned unsaturated spiro orthocarbonate expansion monomer can be used as the anti-curing shrinkage component of the silicone resin encapsulation material. The unsaturated spiro ring orthocarbonate expansion monomer synthesized by the invention can not only expand through ring-opening polymerization, but also react with ethylenic monomers, acrylic resins or vinyl hydrogen-containing silicone resins, and can reduce resin shrinkage.

The invention discloses an expansion agent for cement or concrete, the weight percentages of the components contents of the expansion agent are that magnesium slag takes 70-95%, gypsum takes 5-15%, fly ash takes 0-20%, and additive agent takes 0-5%. The expansion agent is produced by industrial residue and the magnesium slag, which solves the problem that the magnesium slag is accumulated in quantities. The expansion agent has relatively high limited expansion rate, high compression strength and high breaking strength. The invention discloses a process for preparing the expansion agent, the magnesium slag, the gypsum, the fly ash and the additive agent are mixed and grinded in proportion, wherein the magnesium slag contains CaO and MgO and the content is larger than 50%, specific surface area achieves 300-600m2 / kg, and the expansion agent is prepared without calcining by the process.

The present invention relates to an integrated micro-nanofiber / hydrogel double-network artificial blood vessel and its manufacturing method. The artificial blood vessel has three functional layers, the inner and outer layers are electrospun layers, and the middle layer is micro-nanofiber / hydrogel. The hydrogel double network is composed of interwoven micro-nanofiber three-dimensional network and hydrogel network. The micro-nanofiber three-dimensional network is constructed of micro-nanofibers with a high aspect ratio and more than 99% of the fibers are in a monodisperse state; The method is as follows: (1) make an electrospinning solution with high biocompatibility; (2) spin the electrospinning solution prepared in step (1) on the mold; first spin for 3 to 5 hours to form the inner layer of the blood vessel , and then spray the hydrogel precursor powder while spinning to form the middle layer of blood vessels, and finally stop spraying and continue spinning for 3 to 10 minutes to form the outer layer of blood vessels; (3) impregnate the product of step (2) into an excess In the aqueous solution of the agent, the product is obtained after removing the mold. The invention is integrally formed, has good mechanical properties, and is not easy to fall apart during application.

The invention discloses an environmental protection greening device for increasing the survival probability of plants in saline-alkali areas, comprising a mounting seat with planting holes, a placement groove is opened on the upper surface of the mounting seat, a plate body is placed in the placement groove, and the The bottom wall of the placement groove is provided with a moving groove, two sliding blocks are slidably installed in the moving groove, and a second magnetic plate is fixedly installed on the upper ends of the two sliding blocks, and the two magnetic plates are fixedly installed between the second two. There is a rod body 1, the upper ends of the two magnetic plates 2 are magnetically opposite, and a magnetic plate 1 matched with the magnetic plates 2 is fixedly installed on the lower surface of the plate bodies. The advantage is that the overall device will not block the planted plants under normal weather, so that it can fully receive light and rainwater, and in bad weather such as hot and high temperature weather and heavy rain, the board can be quickly moved to the plant. Covering and protecting it from above can improve the survival rate of plants to a certain extent.

The invention discloses a continental shelf mixed organism cultivation device. The continental shelf mixed organism cultivation device comprises a floating base and a spherical sunk base. The outside of the floating base is provided with floating balls, an upper cavity and a lower cavity which are separated are disposed in the floating base, a reel used for winding ropes is disposed in the upper cavity of the floating base, an plurality of expanding bases which are arranged in parallel in the vertical direction are disposed under the floating base, and releasing mechanisms used for controlling the expanding bases to releasing from the floating base one by one are disposed between the floating bases and the expanding bases. A plurality of alga cultivation bricks are disposed on the sunk base, the sunk base is connected with the floating base through ropes, the ropes penetrate through middle portions of all the expanding bases, an inner cavity communicating with the external environment is disposed in the sunk base. The invention aims to provide a continental shelf mixed organism cultivation device being reasonable in structure and various in function, capable of providing food for fish shoal and a good protective effect.

The invention discloses a method for fruit and vegetable interplanting, which refers to a method for jointly planting eggplant and watermelon on plain land, including seed selection-soil preparation-sowing-maintenance-harvesting operation steps, the specific steps are as follows, the seeds of eggplant and watermelon are placed in different In the container, pour cold water into the container at the same time, the seeds with full particles will sink to the bottom of the water, remove the floating residual seeds, salvage the remaining seeds, dry and store them, remove the ground weeds, use the loose soil plow to turn the land, and the soil Crush the blocks so that the fluctuation deviation of the land does not exceed eight centimeters, introduce water channels around the land, pre-bury fertilizers in the soil, and pre-bury fertilizers in the soil, and pour the selected seeds into the interplanting equipment at the same time, and the user drives the interplanting equipment , so that the interplanting equipment is driven on the land surface; the method of fruit and vegetable interplanting in the present invention can effectively improve the operation efficiency of fruit and vegetable interplanting, play a better role in protecting the seedlings in different stages of the growth process, and increase the survival rate of fruit and vegetable interplanting.

The invention provides a prestressed duct grouting material with early strength and low shrinkage. The prestressed duct grouting material is prepared from the following raw materials by weight: 90 to 92% of cement, 0.5 to 2% of superfine attapulgite, 1.5% of gasified residue, 0.008 to 0.01% of polyacrylamide, 0.1 to 0.4% of water-absorbent resin, 0.2% of water reducing agent, 4 to 10% of straw ash, 0.3% of aluminum powder, 0.008% of silane coupling agent and 0.2% of defoaming agent. The prestressed duct grouting material provided by the invention has the advantages that the effects of excellent water holding property, excellent micro-expansion effect, good liquidity, freeness from segregation and bleeding and the like are achieved, the generation of a shrinkage crack of slurry at the early stage is relieved to a great degree, and the mechanical property and durability of the slurry are improved.