8 results about "Gas foaming" patented technology

This invention relates to the field of polyester recycling and discloses a method for separating recycled polyester from waste polyester raw materials, comprising the following steps: S1: classifying the recycled polyester and performing preliminary crushing to reduce the volume of each waste material; S2: placing the classified and crushed waste material into a screw conveyor for transportation, initially melting it at high temperature, and then introducing a gas foaming agent into the screw conveyor. Through a long cooling path, micropores are formed on the surface and inside of the waste polyester particles, which are then placed into a production device for further crushing, while adding a portion of liquid solvent; S3: collecting the semi-finished product and placing it in a certain location for temporary storage, while simultaneously cooperating with the solvent reaction and penetration; This invention can greatly increase the reaction area, increase the processing speed, and increase the overall processing speed, while also reducing the use of processing agents, reducing environmental pollution, and lowering processing costs.

The present application belongs to the technical field of polymer porous foaming material and semiconductor precision cleaning consumables, and particularly relates to a PVA porous foaming material, a preparation method and a semiconductor wafer cleaning brush. The preparation method provided by the present application does not need to use solid particle pore-forming medium, polyvinyl alcohol is dissolved in water to form a glue solution, a surfactant and an acidic catalyst are added to adjust pH and filter, inert gas is introduced for foaming, a formaldehyde solution is added, and the product is obtained through gradient temperature solidification, demolding cleaning and drying. The PVA porous foaming material prepared by the present application has a regular and uniform multi-stage pore structure, the main foam holes are nearly spherical and interconnected to form a three-dimensional network structure. The prepared semiconductor wafer cleaning brush has excellent hydrophilicity, flexibility, high elasticity and high rebound characteristics, no particle precipitation and debris shedding occur in the use process, can meet the ultra-high cleanliness requirement of high-end semiconductor processes, simultaneously simplifies the production process, reduces the environmental protection cost, and has a good industrial application prospect.

The utility model provides an oil removal device for hot galvanizing processing, which comprises a hot galvanizing oil removal case, two wave-making fluctuating mechanisms and a piece placing screen frame, the wave-making fluctuating mechanisms are mounted on the hot galvanizing oil removal case, and the two wave-making fluctuating mechanisms are fixedly connected with the piece placing screen frame; according to the utility model, the high-pressure gas foaming technology is introduced and innovatively combined with the wave-making fluctuating mechanism, so that grease and dirt on the surface of a steel workpiece can be more thoroughly and efficiently stripped and cleaned, and the clever design of the workpiece placing net frame ensures that cleaning liquid can uniformly cover and act on the surface of the workpiece; the problem of non-uniformity in a traditional cleaning mode is solved, the device is particularly suitable for cleaning of precise parts in complex shapes, and the comprehensiveness and quality of cleaning are improved.

The present disclosure provides a porous hydrogen storage alloy bed body and a preparation method thereof, and a hydrogen storage device, and relates to the technical field of solid-state hydrogen storage alloy. The preparation method comprises the following steps: vacuum arc melting of alloy raw materials to obtain a hydrogen storage alloy ingot; wherein the alloy raw materials comprise a vanadium source, a titanium source, a chromium source and an iron source; removing the oxide skin of the hydrogen storage alloy ingot and performing hydrogenation crushing to obtain a hydrogen storage alloy powder; mixing the hydrogen storage alloy powder, a binder, a heat-conducting agent and a gas foaming agent, and loading the mixture into a hydrogen storage container, and performing solidification to form an intermediate bed body; and performing activation treatment on the intermediate bed body at 100-400 DEG C to obtain the porous hydrogen storage alloy bed body. The present disclosure can improve the performance of the hydrogen storage alloy bed body, and the process is simple and suitable for industrial production.

The invention discloses a three-dimensional bracket and a preparation method thereof. The three-dimensional scaffold is of a three-dimensional porous network structure formed by interweaving silicon dioxide nanofibers, and the three-dimensional scaffold is prepared by performing gas foaming treatment on a silicon dioxide nanofiber membrane; an epigallocatechin gallate-metal ion composite coating can be further loaded on the surface of the stent, and metal ions are preferably copper ions. The preparation method comprises the following steps: preparing PVA and TEOS into a spinning solution, and carrying out electrostatic spinning and high-temperature calcination to obtain a silicon dioxide nanofiber membrane; and then soaking in a sodium borohydride solution for gas foaming treatment to construct the three-dimensional porous scaffold. Structural transformation from a two-dimensional membrane to a three-dimensional through porous scaffold is achieved through mild gas foaming, the material is endowed with high water absorption, remarkable antibacterial and antioxidant activity and excellent angiogenesis and osteogenesis promoting performance by combining with the active coating, and the material has good application prospects in the field of tissue regeneration engineering.

This invention relates to a method for preparing a mineralized fiber scaffold composite injectable macroporous hydrogel that mimics natural bone emulsion (ECM). The method proposes preparing a PBLG fiber scaffold using electrospinning, gas foaming, and in-situ mineralization. Subsequently, the mineralized fiber scaffold composite injectable macroporous hydrogel is constructed through negative pressure perfusion, mechanical fragmentation, and gel fragmentation and reorganization. The mineralized fiber scaffold composite injectable macroporous hydrogel prepared by this invention can adapt to irregular bone defect areas, providing temporary support after implantation and offering excellent osteogenic induction and angiogenic activity for subsequent bone defect repair. The macroporous structure formed by microgel reorganization also supports the ingrowth of new tissue. This material has promising applications in bone defect repair and can also be extended to other medical fields such as cartilage defect repair and drug delivery.

The invention discloses a multifunctional biological scaffold as well as a preparation method and application thereof. The method comprises the following steps: performing proteinase K treatment on a natural egg membrane to obtain a pure substrate; performing gas foaming in the wet substrate by hydrolyzing sodium borohydride to release hydrogen so as to construct a three-dimensional porous scaffold; then, a polydopamine coating is formed on the surface of the stent through dopamine oxidation auto-polymerization, and nano-silver particles are loaded through in-situ reduction; and finally, through simulated body fluid mineralization, a bone-like apatite layer is deposited on the surface of the coating. A uniformly interconnected three-dimensional porous structure is created through gas foaming, and a physical platform is provided for subsequent functionalization. The obtained final material integrates a three-dimensional porous structure, rapid physical-chemical synergistic hemostasis, lasting broad-spectrum antibacterial property and strong osteogenic activity promotion, and is especially suitable for repairing infectious bone defects or refractory soft tissue wounds. The preparation technology is simple, raw materials are easy to obtain, and high-value utilization of waste resources is achieved.

The application provides a preparation method of low-density PLA foamed material and belongs to the field of polymer foaming. The application inhibits the hydrolysis of PLA by adding a suitable hydrolysis inhibitor, and the hydrolysis inhibitor can be branched with PLA to make the PLA have a long-chain branched structure, thereby supporting the growth of the cells; the nucleating agent improves the cell nucleation density; the problem of insufficient melt strength caused by the hydrolysis of PLA is solved by adjusting the first saturated adsorption time, and the first saturated adsorption time in the scope of the application can make the gas foaming agent fully dissolved in the polymer, so that the gas foaming agent is sufficient to support the nucleation and growth of the cells in the foaming process; the temperature of the first saturated adsorption is controlled to make the melt strength of the PLA support the growth of the cells; the pressure of the first saturated adsorption is adjusted to make the adsorbed gas sufficient to support the nucleation and growth of the cells in the pressure relief foaming process; and the three-time pressure relief foaming further improves the foaming ratio of the PLA foamed material.