24 results about "Gas foaming" patented technology

The invention relates to the field of electromagnetic shielding polypropylene materials, in particular to an electromagnetic shielding polypropylene foam material and a preparation method thereof, and the electromagnetic shielding polypropylene foam material comprises 40-80% of polypropylene; the content of the compatilizer is 5 to 10 percent; the content of the toughening agent is 4 to 10 percent; 10-30% of an electromagnetic shielding agent; 0-15% of a mineral filler; the content of the coupling agent is 0.2 to 0.6 percent; the content of the antioxidant is 0.1 to 1.0 percent; the content of the lubricating agent is 0.1 to 1.0 percent; a gas foaming agent is injected into the electromagnetic shielding polypropylene material in an injection molding mode, foam holes are formed in the material, so that an electromagnetic shielding agent dispersed in a base material is more intensively gathered in the base material in volume, and a more effective and compact conductive path is formed in the material, so that the electromagnetic shielding polypropylene foam material is obtained.

The preparation method comprises the following steps: (1) fish skin pretreatment: (2) gas foaming treatment: weighing sodium borohydride with a certain molar concentration, dissolving the sodium borohydride in a phosphate buffer solution with a certain concentration, stirring until bubbles in the solution are obviously generated and most of solids are dissolved, and then, carrying out gas foaming treatment; putting the cleaned fish skin tissues in the step (2), and performing foaming treatment; (3) cleaning treatment; and (4) protection and storage. The gas foaming technology is innovatively adopted for decellularization treatment, the interface stripping effect between cells and a matrix is remarkably enhanced on the premise that the collagen three-dimensional structure and the scaffold morphology integrity are not damaged, and the method is suitable for the decellularization pretreatment process of soft tissue (such as fish skin and placenta) with a compact structure or cell-intensive type. The development of a biomedical material, especially a tissue engineering scaffold technology, is promoted, and the preparation method has a wide application prospect.

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.

A method for preparing a bifunctional foam featuring "high strength / high energy absorption" and "super-hydrophobicity / self-cleaning", relating to the technical field of organic polymer materials. By means of a gas foaming technology, composite constraint is used to introduce anisotropic foam cells into a polymer material, and the anisotropic foam cells endow the polymer material with super energy absorption characteristics by means of unique deformation of progressive buckling and reciprocating distortion under compression or impact; and a "barbed" structure is introduced onto the surface of the polymer, achieving the super-hydrophobic / self-cleaning function on the surface of the polymer foam, and finally obtaining a bifunctional polymer foam featuring "high strength / high energy absorption" and "super-hydrophobicity / self-cleaning". The method is simple, feasible, and environmentally friendly, has low cost and good reproducibility, and can achieve large-scale production. The resulting thermoplastic polymer material, such as a polypropylene foam, has excellent performance and important significance in the field of safety protection.

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 application provides a temperature-driven piezoresistive sensor and a preparation method thereof, and belongs to the field of foamed materials. The application provides a preparation method of a temperature-driven piezoresistive sensor, which comprises the following steps: melt blending a thermoplastic elastomer and / or degradable polyester with polycaprolactone to obtain a to-be-foamed body; and sequentially performing saturated adsorption and pressure relief foaming on the to-be-foamed body in an environment containing a gas foaming agent to obtain the temperature-driven piezoresistive sensor; the temperature of the saturated adsorption is (T m -60℃)~T m , T m is the melting point of the to-be-foamed body; the pressure of the saturated adsorption is 10-30 MPa, the time of the saturated adsorption is d x (30-180) min, d is the thickness or particle size of the to-be-foamed body, and the unit is mm; and the pressure relief speed of the pressure relief foaming is 10-300 MPa / s.

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 relates to a polyamino acid electrostatic spinning mineralization bracket with a hierarchical pore structure and a preparation method thereof. A three-dimensional PBLG electrostatic spinning fiber scaffold is prepared through a gas foaming method, and the structural stability of the three-dimensional scaffold is remarkably improved through welding and subsequent in-situ mineralization in a CH2Cl2 steam atmosphere. The prepared bionic fiber scaffold can play a temporary supporting role after being implanted into a defect area, good osteogenesis induction and angiogenesis activity are provided for subsequent bone defect repair, a pore structure formed through foaming can also support ingrowth of new tissues, and the scaffold has good application prospects in the field of bone defect repair and is suitable for popularization and application in the field of bone defect repair. The method can also be expanded to the medical fields of hemostasis, drug delivery and the like.

A multi-layer composite intumescent fire-retardant coating, and a preparation method and a usage method therefor. The coating comprises a bottom fire-retardant coating and a surface fire-retardant coating, which are laminated into a single layer or in an ABAB form. The bottom fire-retardant coating contains a physical intumescent agent, and the surface fire-retardant coating contains a gas foaming type intumescent agent. By laminating the bottom fire-retardant coating containing the physical intumescent agent and the surface fire-retardant coating containing the gas foaming type intumescent agent, a multi-layer composite fire-retardant coating system is formed, the filling effect of the physical intumescent agent and the expansion effect of the gas foaming type intumescent agent are fully exerted, and the size of pores in an expansion layer formed under flames is greatly reduced, thereby both improving the compactness and strength of the expansion layer and enhancing the heat insulation performance of the expansion layer.

Described herein are systems and methods for enhancing the production rate and secretion of extracellular vesicles (EVs) from cells. In some embodiments, the systems and methods comprise a three-dimensional (3D) piezoelectric nanofibrous scaffold comprising polymer nanofibers, and acoustic stimulation of the 3D piezoelectric nanofibrous scaffold. In one aspect, the EVs comprise small extracellular vesicles (sEVs). Also described herein are methods of making 3D piezoelectric nanofibrous scaffolds for cell culture comprising electrospinning and gas foaming processes.

The embodiment of the present disclosure discloses a gas-liquid mixing unit on a foaming mechanism, a foaming mechanism and a kitchen and bathroom equipment, which relates to but is not limited to kitchen and bathroom technology. The gas-liquid mixing unit is provided with a liquid inlet flow channel, a gas inlet flow channel, a liquid outlet flow channel and a plurality of mixing flow channels. The liquid inlet flow channel is arranged to supply the foaming liquid to the plurality of mixing flow channels. The gas inlet flow channel is arranged to supply the gas mixed with the foaming liquid to the plurality of mixing flow channels. After the foaming liquid and the gas enter the gas-liquid mixing unit, the foaming liquid and the gas are divided by the plurality of mixing flow channels, so that the foaming liquid and the gas can be mixed in the plurality of mixing flow channels respectively, and the mixed liquid with numerous tiny bubbles is formed under the action of the gas. Compared with the thick foaming liquid, the mixed liquid has a larger volume and is more delicate, has better fluidity, and can quickly form a uniform and delicate foam with other liquids, so that less foaming liquid can achieve better foaming effect.

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.

The invention relates to fire preventing and extinguishing foam gel with shear thickening and CO indication self-healing functions in an underground coal mine goaf and a preparation method of the fire preventing and extinguishing foam gel. The foam gel comprises a reversible association rheological aid, a CO colorimetric indicator, an ion exchange type self-healing filler, a foaming agent, a foam stabilizer and a gelling agent which are dispersed in a water phase according to a specific ratio and are formed by gas mixing and foaming. The material can be instantly thickened under the condition of high-shear air leakage, so that the erosion resistance of a foam structure is improved; in the service period, when the local part is damaged and the CO concentration is increased, the bubble wall develops color to prompt and release the self-healing filler, so that the leakage point is quickly repaired, and the air tightness is recovered. The dual-function system can realize real-time monitoring and dynamic protection in a complex goaf environment, obviously prolong the service cycle and improve the sealing and oxygen isolation effects, and has the advantages of simple structure, easiness in industrialization of the preparation process and high applicability.

The present application provides an injection molding machine and a production process for an EPP molding product production line, including a reaction tank, a screw extruder, a post-treatment system, and a molding system connected in sequence; a pre-expansion mixing system is arranged on the screw extruder; a gas foaming agent inlet is arranged on the pre-expansion mixing system, and the pre-expansion mixing system is connected to a gas generator through the gas foaming agent inlet. By adding a pre-expansion mixing system to the screw extruder and connecting a gas generator at the gas foaming agent inlet of the pre-expansion mixing system, the number of bubbles is further increased, so that the bubbles are more evenly distributed throughout the polypropylene material, thereby improving the product quality and making it more suitable for applications in some occasions with higher appearance requirements or larger load-bearing requirements.

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 invention provides a temperature driving-piezoresistive sensor and a preparation method thereof, and belongs to the field of foaming materials. The invention provides a preparation method of a temperature-driven piezoresistive sensor, which comprises the following steps: carrying out melt blending on a thermoplastic elastomer and / or degradable polyester and polycaprolactone to obtain a to-be-foamed body; the to-be-foamed body is placed in an environment containing a gas foaming agent to be subjected to saturated adsorption and pressure relief foaming in sequence, and the temperature driving-piezoresistive sensor is obtained; the temperature of saturated adsorption is (Tm-60 DEG C)-Tm, and Tm is the melting point of the to-be-foamed body; the pressure of the saturated adsorption is 10-30 MPa, the time of the saturated adsorption is d * (30-180) min, d is the thickness of the to-be-foamed body or the particle size of the to-be-foamed body, and the unit is mm; the pressure relief speed of the pressure relief foaming is 10-300 MPa / s.

Disclosed are a multilayer composite intumescent fire-retardant coating material, a preparation method therefor, and a method of using the same, relating to the technical field of intumescent fire-retardant coating materials. The coating material comprises a bottom fire-retardant coating material and a surface fire-retardant coating material, and a composite method is a single layer or presents an ABAB . . . type. The bottom fire-retardant coating material contains a physical expansive agent. The surface fire-retardant coating material contains a gas-foaming expansive agent. By fully utilizing the filling effect of the physical expansive agent and the expanding effect of the gas-foaming expansive agent, the size of pores formed in the expansion layer under the fire is substantially reduced, which not only improves the compactness and strength of the expansion layer but also improves the thermal insulation performance of the expansion layer.

The invention provides a porous hydrogen storage alloy bed body, a preparation method thereof and a hydrogen storage device, and relates to the technical field of solid hydrogen storage alloys. The preparation method comprises the following steps: carrying out vacuum arc melting on an alloy raw material 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; oxide skin of the hydrogen storage alloy cast ingot is removed, hydrogenation crushing is carried out, and hydrogen storage alloy powder is obtained; mixing hydrogen storage alloy powder, a binder, a heat conducting agent and a gas foaming agent, filling the mixture into a hydrogen storage container, and curing to form a middle bed body; and activating the middle bed body at the temperature of 100-400 DEG C to obtain the porous hydrogen storage alloy bed body. The performance of the hydrogen storage alloy bed body can be improved, and the process is simple and suitable for industrial preparation.

The invention relates to a semiconductor bonding structure. The semiconductor bonding structure mainly comprises a bearing substrate, a wafer and a foaming adhesive layer, the bearing substrate and the wafer are arranged in a stacked mode, and the foaming bonding layer is located between the bearing substrate and the wafer and used for bonding the bearing substrate and the wafer. The foaming adhesive layer comprises an adhesive body and a plurality of foaming particles, wherein the foaming particles can be decomposed and generate gas at high temperature. The gas generated by the foaming particles destroys the structure of the foaming bonding layer and pushes the bearing substrate and the wafer towards the two sides, so that a de-bonding step of the wafer and the bearing substrate is facilitated, and the wafer can be prevented from being damaged in the de-bonding process.

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.

The invention discloses a light heat-preservation engineering felt which comprises a fabric layer, a flame-retardant layer is attached to the interior of the fabric layer, an adhesive layer is attached to one side of the flame-retardant layer, a reinforcing layer is arranged on one side of the adhesive layer, glass fibers are arranged in the reinforcing layer, and reinforcing steel wire meshes are fixed to the two sides of the reinforcing layer. Foaming cement is arranged on one side of the reinforcing layer; according to the lightweight thermal-insulation engineering felt, through cooperative use of the fabric layer, the flame-retardant layer, the adhesive layer and the foaming cement, the flame-retardant layer can inhibit or delay flame spreading and improve the fireproof safety of the material, the prefabricated engineering felt is laid on the working condition surface during use and is directly sprayed with water to be hardened and formed, and meanwhile, a foaming agent is added into the foaming cement, so that the thermal-insulation performance of the engineering felt is improved. The foamed cement can release gas to foam after meeting water, so that the foamed cement can be porous after being hardened, the product is lighter, meanwhile, the good heat preservation effect is ensured, the foamed cement is suitable for various scenes, the energy efficiency can be improved, and the building safety can be enhanced.

The invention relates to the technical field of radiation refrigeration, and particularly provides a radiation refrigeration material preparation method, a radiation refrigeration material and a radiation refrigeration method. The preparation method of the radiation refrigeration material comprises the following steps: putting a material to be foamed into a supercritical foaming device; after the internal temperature of the supercritical foaming device reaches the set temperature, foaming gas is introduced into the supercritical foaming device; the foaming gas comprises supercritical carbon dioxide or supercritical nitrogen; and the internal gas pressure of the supercritical foaming device is adjusted to the set pressure, and after the reaction time is maintained, the radiation refrigeration material is prepared through pressure relief. According to the method, the radiation refrigeration material is prepared through the expansion behavior of carbon dioxide or nitrogen permeating into the to-be-foamed material in the supercritical state in the pressure relief foaming process, pollutants or toxic and harmful substances cannot be generated in the preparation process, the ecological environment can be prevented from being damaged in the preparation process of the radiation refrigeration material, and the service life of the radiation refrigeration material is prolonged. The wide application of the radiation refrigeration material is facilitated.