4results about How to "Slow down aggregation" patented technology

The invention discloses a ceramic sheet and a preparation method thereof, and belongs to the technical field of ceramic composite materials. The method comprises the following steps: injecting preparation raw materials into a mold, curing, demolding, drying, discharging glue and sintering, the preparation raw materials comprise a slurry raw material, an initiator and a catalyst; the slurry raw material comprises a powder raw material and a premixed solution; the powder raw material comprises ceramic powder and a sintering aid; the premixed liquid comprises an organic monomer, a cross-linking agent and the like. The mass of the powder raw material is 60-77% of that of the slurry raw material; the mass of the organic monomer is 14-25% of that of the premixed solution, and the mass ratio of the organic monomer to the cross-linking agent is 20: 1-70: 1. By adopting the preparation raw materials with the specific composition and proportion, the polymerization speed of the monomer and the cross-linking agent can be slowed down, the toughness of a cured wet blank can be improved, the ceramic sheet with relatively high bending strength, fracture toughness and hardness can be obtained, in addition, the method can realize rapid lifting and pulling of an upper mold, the demolding and forming efficiency can be improved, and the production cost can be reduced.

The application provides a method for preparing a high-entropy alloy composite material. In the application, a high-entropy alloy grid is prepared by using a synchronous laser cladding technology, the high-entropy alloy grid is strengthened by using a heat treatment technology, the high-entropy alloy composite powder is formed by using a hot pressing technology, and finally the hot-pressed composite material is finally formed by using a laser melting technology. The existence of the high-entropy alloy grid can avoid the large-area enrichment of ceramic particles, the preform is prepared by using the hot pressing technology, the combination between the high-entropy alloy grid and the high-entropy alloy composite material in the subsequent melting process is increased, and the aggregation speed of the ceramic particles in the melting process is slowed down, so that the high-entropy alloy composite material is solidified and formed before the ceramic particles are aggregated. Therefore, the high-entropy alloy composite material prepared by the application does not have the aggregation of the reinforcing phase, and the composite material has good strength and toughness.

The invention relates to the technical field of membrane separation materials and discloses an SD membrane based on synergistic alcohol phase system interfacial polymerization and a preparation method of the SD membrane. The SD membrane has high flux, controllable desalination rate and excellent operation stability. The preparation method comprises the following steps: (1) adding a polymer into an organic solvent to obtain a mixed solution; (2) continuing to add a pore-foaming agent to obtain a precursor solution; (3) carrying out vacuum defoaming treatment on the precursor solution, and blade-coating the precursor solution on a carrier to obtain a base membrane; (4) sequentially infiltrating the base membrane into the synergetic alcohol phase system solution and the oil phase solution to perform polyamide treatment to obtain an SD membrane; the synergetic alcohol phase system solution comprises an interfacial polymerization amine monomer, a diffusion regulator, a network building agent and a functional copolymerization monomer; the diffusion regulator comprises monohydric alcohol of which the number of carbon atoms is less than or equal to 3; the network building agent comprises polyhydric alcohol with the number of carbon atoms smaller than or equal to 3 or a polymer of the polyhydric alcohol; the functional comonomer comprises an alcohol amine compound with the number of carbon atoms less than or equal to 4; the oil phase solution includes an interfacial polymerization acyl chloride monomer.

The invention relates to the technical field of para-aramid fiber production, in particular to a para-aramid fiber polymerization device and a polymerization method. The para-aramid polymerization device comprises a pre-polymerization reactor and a polymerization reactor which are in butt joint, the pre-polymerization reactor comprises a horizontally-arranged machine barrel, a tile lining layer is attached to the inner wall of the machine barrel, a conical screw is arranged in the machine barrel, a screw driving motor and a pin assembly are arranged outside the machine barrel, and the pin assembly comprises a plurality of pins. The pin penetrates through the machine barrel and the tile lining layer in a sealed mode and then abuts against a main shaft of the conical screw, a notch for the pin to penetrate through is formed in threads of the conical screw, the tile lining layer, the main shaft and the pin are all of a hollow structure and are all communicated with a nitrogen cooling circulation system, and the tile lining layer is opposite to the flowing direction of nitrogen in the main shaft. According to the invention, feeding is carried out in an atomization opposite spraying manner, and a reciprocating extrusion mixing structure and a triple strong cooling structure are matched, so that the temperature control effect is good, the reaction material mixing and dispersing effect is good, the HCl-containing waste gas discharge efficiency is high, and high-quality para-aramid resin can be obtained.