4121 results about "Pelletizing" patented technology

The invention relates to the technical field of high polymer material preparation, and discloses a bamboo fiber graft modified full-biodegradable composite membrane material preparation process which comprises the following steps: firstly, performing hot mixing and cooling on dried bamboo fiber powder, anhydrous citric acid, choline chloride, activated zinc oxide and pentaerythritol to prepare a bamboo fiber modified premix; then mixing the biodegradable polyester resin with the premix; adding the mixture into an extruder, injecting epoxidized soybean oil into a barrel through a liquid metering device, and performing melt extrusion granulation under a vacuum exhaust condition; and finally carrying out blow molding to form the film. Through in-situ reaction extrusion of multi-component synergism, surface grafting of bamboo fibers, chain extension of a polyester matrix and interface chemical bonding of the bamboo fibers and the polyester matrix are achieved, interface compatibility is effectively improved, degradation of the material in the processing process is inhibited, and the mechanical property and thermal stability of the composite film material are remarkably improved; the process is efficient and environment-friendly, and the cost is controllable.

Provided are a water-resistant wood-plastic reinforced composite flooring and a manufacturing method therefor. Wood flour is boiled in boiling water for 3-4 hours, filtered and dried, to obtain dried wood flour; polypropylene, butyl acrylate, methyl methacrylate, maleic anhydride and dicumyl peroxide are mixed evenly, extruded and granulated, and dried to obtain a compatibilizer; the dried wood flour and polypropylene are mixed evenly, the compatibilizer is added and mixed evenly, then extrusion and granulation, and injection molded, are performed, to obtain a wood-plastic flooring blank; a composite resin emulsion and a photoinitiator are ultrasonically mixed evenly, and the wood-plastic flooring blank is immersed therein, then taken out and dried at room temperature, and then vacuum dried and UV cured, to obtain water-resistant wood-plastic reinforced composite flooring.

An ultrafine grain cemented carbide additive manufacturing method. WC-Co is used as a raw material, a crystal grain growth inhibitor is added, and a rare earth oxide is added as a reinforcing phase; paraffin and a trace amount of low-valence rare earth oxide powder are added, ball milling is carried out for coating cemented carbide powder, and oxygen control is carried out; the cemented carbide powder obtained by ball milling and an organic adhesive are loaded in a vacuum banbury mixer-granulator to prepare a printing feed, then a green body is printed using fused deposition modeling (FDM), and finally, degreasing and two-step sintering are carried out on the green body to prepare ultrafine cemented carbide. By means of the combined effect of the components and process optimization design, the powder properties are regulated, the process range of vacuum banburying and granulation and additive manufacturing is widened, and the problems of pores, interlayer cracks, and oxygen absorption in a printed green body, and abnormal grain growth, oxidation decarburization, and the formation of brittle η-phase in a sintered sample are solved. The prepared ultrafine grain cemented carbide exhibits high relative density, is free of metallurgical defects, possesses excellent mechanical properties, and is suitable for large-scale and mass production.

The present invention belongs to the technical field of liners, and specifically discloses a high-wear-resistant mixed pelletizing machine liner and a preparation method thereof. The liner includes a base layer and a wear-resistant layer composited on the surface of the base layer. The base layer is made of high-strength alloy steel material, and its chemical composition is calculated by mass percentage as follows: C: 0.25-0.35%, Si: 0.4-0.8%, Mn: 1.2-1.6%, Cr: 0.8-1.2%, Mo: 0.2-0.4%, Ni: 0.3-0.6%, Nb: 1.0-1.6%, and the balance is Fe; the wear-resistant layer includes tungsten carbide particles, a composite alloy material, and an adhesive. The present invention adopts the above-mentioned high-wear-resistant mixed pelletizing machine liner and a preparation method thereof, aiming to solve the problems of insufficient wear resistance and short service life of existing mixed pelletizing machine liners, and improve the comprehensive performance of the mixed pelletizing machine liner through composite structure design and special preparation process.

The invention discloses a degradable bamboo fiber express packaging bag and a preparation method thereof, and belongs to the technical field of express packaging. The packaging bag is prepared from, by mass, 32-42 parts of pretreated bamboo fibers, 22-28 parts of poly (butylene succinate), 9-14 parts of modified nano calcium carbonate, 12-16 parts of polycaprolactone, 6-11 parts of acetylated chitosan and the like, and the key raw materials are all treated through an exclusive pretreatment or modification process. The preparation method comprises the steps of raw material plasma activation, segmented high-speed mixing, vacuum drying, precise-parameter twin-screw extrusion granulation, secondary drying, precise film blowing, high-precision heat-sealing bag making and the like, and the technological parameters of all the steps are clear. The product disclosed by the invention can be efficiently degraded in a natural environment, has excellent tensile resistance, puncture resistance and impact resistance, is stable and controllable in processing process, and is adaptive to actual requirements of express packaging and industrial batch production.

The invention discloses a high-weather-resistance halogen-free flame-retardant polyamide composite material and a preparation method thereof, and belongs to the technical field of high polymer materials. The composite material comprises the following raw materials in parts by weight: 20-60 parts of polyamide resin A, 0-20 parts of polyamide resin B, 10-50 parts of glass fibers, 0.1-2 parts of an ultraviolet absorbent, 0.1-2 parts of a free radical scavenger, 10-20 parts of a halogen-free flame retardant, 1-15 parts of a flame retardant synergist and 0.5-5 parts of a conventional auxiliary agent. The preparation method comprises the following steps: uniformly mixing the polyamide resin A, the polyamide resin B, the ultraviolet absorbent, the free radical scavenger, the flame-retardant synergist and the conventional auxiliary agent in a high-speed mixer according to the proportion to obtain a mixture, then adding the mixture into a double-screw extruder through main feeding, side feeding of the halogen-free flame retardant through a first side feeding and side feeding of the glass fiber through a second side feeding, and carrying out extrusion molding to obtain the flame-retardant polyamide composite material. And carrying out melt blending and extrusion granulation to obtain the high-weather-resistance halogen-free flame-retardant polyamide composite material. The obtained high-weather-resistance halogen-free flame-retardant glass fiber reinforced polyamide composite material is excellent in mechanical property, flame retardance and weather resistance.

The invention relates to a magnesia-carbon refractory material with high thermal shock resistance and erosion resistance and a preparation method thereof. The magnesia-carbon refractory material with high thermal shock resistance and erosion resistance is prepared from fused magnesia aggregate, fused magnesia fine powder, silicon powder, crystalline flake graphite, Al2O3-MgO-CaO core-shell structure raw materials and phenolic resin. The Al2O3-MgO-CaO core-shell structure raw materials are prepared by the following steps: uniformly mixing calcium carbonate, magnesium hydroxide and alumina micro powder by adopting a planetary ball mill, and then carrying out granulation treatment by adopting a disc granulator by taking polyvinyl alcohol as a binding agent, so as to obtain core particles; and mixing the inner core particles and the alumina micro powder by taking alumina sol as a binding agent, and further sintering to obtain the core-shell structure raw material. The Al2O3-MgO-CaO core-shell structure raw material is utilized to improve the comprehensive performance of the magnesia-carbon refractory material, and the prepared magnesia-carbon refractory material has excellent thermal shock resistance and slag corrosion resistance and can meet the requirements of the current steel industry for the magnesia-carbon refractory material.

The invention discloses a plastic hollow plate and a manufacturing method thereof, the plastic hollow plate comprises the following components by weight: 30%-60% of a polypropylene matrix and 40%-70% of phosphogypsum powder, and polypropylene provides thermoplastic formability and toughness. The preparation method specifically comprises the following steps: 1) pretreating ardealite; 2) melt blending granulation; (3) forming a hollow plate; and 4) post-processing. The ardealite hollow plate has the advantages that the ardealite filling amount is increased, meanwhile, the bending strength and impact strength of a traditional hollow plate are improved, and the performance is improved by 20% or above compared with that of a traditional hollow plate with the same filling amount; the moisture content of the pretreated phosphogypsum is less than 6%, so that bubbles in the processing process are avoided, and the interface bonding strength is improved; the comprehensive utilization rate of industrial byproduct phosphogypsum is improved, and the production cost is reduced.

The invention relates to the technical field of solid waste recycling, in particular to a method for preparing ceramsite through multi-element solid waste co-treatment. The method comprises the following steps: S1, uniformly stirring and mixing waterworks sludge, washing-free waste incineration fly ash, polluted soil and iron tailing slag powder in proportion to obtain a stirred mixture; s2, directly putting the stirred mixture which is uniformly mixed and is in a wet state into a ceramsite drying and granulating kiln, and granulating in the kiln to obtain raw material balls; s3, the raw material balls enter a pyrolysis section in the kiln to be subjected to low-temperature pyrolysis treatment; s4, the pyrolyzed raw material balls enter a calcining kiln to be subjected to high-temperature sintering treatment; and S5, passing the obtained sample through a cooling kiln, and taking out the cooled sample to obtain the multi-element solid waste ceramsite. According to the method, pure solid waste is adopted for preparing the ceramsite, and the links of raw material drying and granulation in traditional ceramsite manufacturing are omitted. The sludge of the waterworks, the waste incineration fly ash, the polluted soil and the iron tailing slag are utilized in a high-valued manner, the energy consumption is low, and less secondary environmental pollutants are generated.

The invention relates to a regenerated rubber and plastic asphalt composite modifier based on shear force-temperature-interface modification as well as a preparation method and application thereof. The regenerated rubber and plastic asphalt composite modifier comprises 65-75 parts of tire rubber powder, 17-25 parts of polyethylene, 8-12 parts of aromatic oil and 0-2 parts of a silane coupling agent (not 0). All the raw materials are mixed and then added into a double-screw extruder, gradient temperature control is conducted through a feeding area, a plasticizing area and a homogenizing area, and finally granulation is conducted to obtain the regenerated rubber and plastic asphalt composite modifier. Compared with the prior art, the invention creatively utilizes the effects of double-screw shear force, high temperature, interface activation of the silane coupling agent, physical melting recombination and chemical interface activation, efficiently improves the integration and activation efficiency and effect of the tire rubber powder and polyethylene, and greatly improves the performance of the modified asphalt.

A marine vessel designed for the collection, shredding, and pelletizing of oceanic plastic waste. The vessel uses renewable energy sources such as solar panels and wind turbines to power onboard systems, including AI-enhanced sensors that detect and target high-density areas of plastic debris. Once collected, the plastic is shredded and processed into uniform plastic pellets optimized for use in plastic asphalt production. The vessel also includes storage compartments for the pellets and a crane system for transferring containers filled with pellets to adjacent vessels or shore-based transport. This integrated system addresses inefficiencies in traditional ocean cleanup methods by enabling immediate onboard processing, reducing transportation needs, and repurposing plastic waste into a valuable industrial resource, while significantly minimizing environmental impact through sustainable energy use.

The invention provides coal-based porous carbon for preparing a silicon-carbon negative electrode material as well as a preparation method and application of the coal-based porous carbon, coal-based porous graphite is used as a matrix carbon material, polymer resin is used as a rigid bonding and coating material, heterogeneous elements such as B, N and P are used as doping materials, a carbon nanotube is used as a flexible conductive buffer material, and the materials are dispersed in a solvent to form slurry; through atomization granulation and high-temperature carbonization, heterogeneous element doped resin hard carbon is bridged with carbon nanotubes to construct a three-dimensional rigid-flexible conductive network to cooperatively coat the surface of the porous coal-based graphite, and doped heterogeneous elements are utilized to induce chemical-physical auxiliary activation to perform micro-mesoporous precise regulation and control pore forming on an inner core and a shell. The prepared novel coal-based porous carbon is high in porous framework particle strength and reasonable in pore distribution and has a three-dimensional rigid-flexible conductive network core-shell structure. The invention aims to solve the problems of unreasonable pore distribution of porous carbon, poor matrix strength and the like in the preparation process of a novel vapor deposition silicon-carbon negative electrode material.

The inventive technique process of grainy calcium material for preventing and treating peanut blight primarily includes: adopting the shell powder and weathered coal as raw materials, machining into peanut blight prevention material through agglomeration granulation. The invention has innovative and reasonable design, which not only has simple process, easy implementing, but also has low cost of raw materials, product application convenience, remarkable peanut blight prevention effect, and capability of promoting high-efficient production pf peanut. In particular, the invention applies coastal oyster shell wastes for machining calcium materials for preventing and treating peanut blight, which not only reduces environmental pollution, but also promotes recycling of resources, has very significant economic, social and ecological benefits and greater promotional value.

The invention discloses a preparation method of a POK and EVOH blending modified high-barrier material, which comprises the following steps: pre-drying, uniformly mixing, cooling and curing, air injection for water removal, pelletizing, secondary drying and the like to obtain the POK and EVOH modified high-barrier material, compounding the POK, EVOH and EAA according to a certain proportion to form a three-phase mixed system, and playing a synergistic effect to obtain the POK and EVOH blending modified high-barrier material. The oxygen barrier effect is improved; through the special compatilizer for POK, the compatibility of POK and the EVOH material is improved, and the mechanical property of the material is improved; the oxygen barrier effect of POK at high temperature and high humidity is basically not reduced, and the oxygen barrier effect of the whole system at high temperature and high humidity is improved; the antioxidant system improves the thermal stability of the EVOH material and the POK material during processing, and solves the problems that the materials are easy to decompose during processing and easy to yellow after being used for a long time.

The invention discloses a preparation process of a high-temperature-resistant and wear-resistant polymer composite material, which comprises the following preparation steps: (1) selecting polyether-ether-ketone as matrix resin, and drying the matrix resin at 150 DEG C for 4 hours; (2) preparing porous sphere-like boron carbide ceramic powder; (3) carrying out surface treatment on the prepared porous sphere-like boron carbide ceramic powder; and (4) uniformly mixing the boron carbide ceramic powder subjected to surface treatment in the step (3) and polyether-ether-ketone in a mild mixing manner, compounding with carbon fibers, and extruding and granulating by using a double-screw extruder to obtain the high-temperature-resistant and wear-resistant polymer composite material. Through the mode, the composite material prepared by the method does not contain PFAS chemical substances, is superior to the existing PTFE material in the aspects of wear resistance, environmental protection property, high temperature resistance and the like, and is an ideal reliable PTFE substitute material.

The invention discloses a nanostructure thermal protection coating resistant to long-time high-temperature oxidation and a preparation method thereof.The nanostructure thermal protection coating takes a ceramic matrix composite material as a matrix, and a bonding layer and a composite component coating are sequentially sprayed to the surface of the matrix. Preparing a nano-structure self-healing additive / Re2Si2O7 spherical powder body; preparing a bonding layer on the surface of the ceramic-based composite material serving as a matrix; and 3, depositing the nano-structure self-healing additive / Re2Si2O7 spherical powder on the surface of the bonding layer to form the composite component coating. According to the preparation method, the self-healing additive / Re2Si2O7 is prepared into the nano-structure spherical powder suitable for thermal spraying for the first time, and a method is provided for implementation of the high-performance material on a thermal spraying nano-structure coating. The prepared coating is stable in phase structure at high temperature, phase change of powder is avoided in the spraying process, and the coating has good thermal expansion coefficient matching performance with a base body.

The invention discloses a compound yeast agent for anaerobic degradation of biodegradable plastics. The compound yeast agent comprises the following components in percentage by mass: 0.5-3% of fenpropathrin, 1-6% of nitrite, 1-4% of ammonium molybdate, 5-10% of PLA, 5-10% of nano starch, 3-6% of nano calcium carbonate, 1-5% of carbamide and the balance of a biodegradable resin carrier. The production method comprises the following steps: 1, dispersion treatment; 2, centralization processing; 3, carrying out structured treatment; 4, carrying out carrier implantation treatment; and 5, plasticizing and granulating. The compound yeast agent is added into the plastic, and the addition amount is 1-5%, so that the anaerobic degradation plastic is formed. According to the invention, anaerobic degradation can be regulated and controlled, and more importantly, anaerobic degradation also realizes that the degradable plastic disclosed by the invention is in a normal use condition, the plastic cannot be degraded quickly in light and oxygen environments, the aging property of the plastic is equivalent to that of a resin matrix of the plastic, and the physical and mechanical properties are ensured.

The invention discloses an energy-saving environment-friendly spray granulation tower for aluminum oxide ceramic material processing, which comprises a bottom plate, a mixing barrel is fixedly mounted at the upper end of the bottom plate, a heating pipe is spirally wound on the outer side of the mixing barrel, a stirring assembly is arranged in an inner cavity of the mixing barrel, a granulation tower box is arranged at the rear end of the mixing barrel, and the granulation tower box is arranged in the inner cavity of the mixing barrel. And the lower end of the granulation tower box is fixedly connected with a collection hopper. According to the energy-saving and environment-friendly spray granulation tower for aluminum oxide ceramic material processing, by starting a driving motor, the output end of the driving motor drives a first stirring shaft to rotate, the first stirring shaft rotates to drive a main cone pulley to rotate, the main cone pulley rotates to drive a transmission cone pulley to rotate, and then through cooperation of a driven cone pulley, the energy-saving and environment-friendly spray granulation tower is driven to rotate. The second stirring shaft can conveniently rotate reversely, so that the materials in the mixing barrel can be fully stirred by a plurality of groups of stirring rods, and the problem that the quality and the size of formed spherical particles do not reach the standard due to the fact that the materials are not uniformly mixed can be avoided.

The invention relates to the technical field of high polymer material processing, and particularly discloses a polyethylene rotational plastic-gradient density-based lightweight hollow product and a method thereof.The polyethylene rotational plastic-gradient density-based lightweight hollow product is prepared from high-density polyethylene, linear low-density polyethylene, nano-silica, carbon nanotubes, a flexibilizer, PE wax and an antioxidant through blending, granulation and grinding; placing the powder in a mold, heating, melting and spinning to form an outer high-density enhancement layer; the preparation method comprises the following steps: blending low-density polyethylene, high-density polyethylene, a microcapsule foaming agent, a compatibilizer and an antioxidant, granulating and grinding; the powder is placed in a mold to continue to be heated and rotated till fusion is completed; cooling to trigger the microcapsule foaming agent to decompose, and reducing the rotating speed until an inner low-density foaming layer is formed on the inner wall of the outer high-density enhancement layer; and performing water-cooling on the outer-layer step, and performing air-cooling on the inner-layer step to obtain a light-weight hollow finished product. The multifunctional requirements for light weight, high strength and heat insulation can be met at the same time, and densification, foaming and gradient curing are completed in a single period.

The invention discloses a biomass charcoal processing pelletizer, and relates to the technical field of pelletizers, the biomass charcoal processing pelletizer comprises a driving assembly and a pelletizing chamber, a circular mold is fixedly connected in the pelletizing chamber, the output end of the driving assembly is an output shaft extending into the pelletizing chamber, during pelletizing operation, two compression rollers revolve around the axis of the circular mold along with rotation of the output shaft, and meanwhile, the two compression rollers rotate around the axis of the circular mold along with rotation of the output shaft. Under the action of the rotating assembly, in the process, the pressing roller automatically rolls to bite materials into an extrusion area, further, force applied to the materials by rolling of the pressing roller is perpendicular to the tangential direction of the outer contour of the pressing roller, and the included angle between the pressure direction and the axis direction of a discharging die hole of the circular die is extremely small, so that the working efficiency is high; active rotation of the compression roller replaces passive rotation, passive rotation promoted by friction between the compression roller and the circular mold and materials is avoided, accumulated heat in the granulation chamber is reduced, energy is saved, meanwhile, abrasion of the materials to the compression roller and the circular mold is relieved through active rotation compared with passive rotation, and the equipment maintenance cost is reduced.

The invention relates to the technical field of plastic recovery, in particular to waste plastic recovery granulation equipment which comprises a screw extruder, a mounting cover is fixedly mounted at the right end of the screw extruder, discharge ports are formed in the positions, corresponding to die orifices of the screw extruder, of the right end of the mounting cover, and a guide unit is mounted in the mounting cover; a pre-cooling unit is mounted at the right end of the screw extruder and is positioned in the mounting cover; the plastic strip pre-cooling forming device is used for recycling waste plastic, extruded plastic strips in a molten state can be uniformly pre-cooled and formed, the problems that the plastic strips crack or plastic particles obtained after particle cutting are irregular in shape and the like are solved, the quality of the produced plastic particles is ensured, and the production efficiency is improved. And meanwhile, extruded plastic strips in a molten state can be guided, drooping deformation of the plastic strips under the action of gravity is prevented, the sizes of the plastic strips in the axial direction are consistent, and then it is guaranteed that the sizes of plastic particles produced subsequently are uniform.

The invention relates to the technical field of concrete waterproofing agents, in particular to a high-efficiency concrete anti-crack waterproofing agent and a preparation method thereof, and the high-efficiency concrete anti-crack waterproofing agent is prepared from the following raw materials in parts by weight: a calcium sulphoaluminate expanding agent; light burning of magnesium oxide; re-burning the magnesium oxide; nano-scale silicon dioxide; metakaolin; polypropylene fibers; basalt fibers; styrene-acrylic emulsion; a silane emulsion; silica fume; hydroxypropyl methyl cellulose; and a polycarboxylic acid water reducer compatilizer. According to the high-efficiency concrete anti-crack waterproof agent disclosed by the invention, the nano-silica, the metakaolin and the styrene-acrylic emulsion synergistically block nano-to-macroscopic multi-stage pores, so that double waterproofing of physical filling and chemical film forming is realized; the polypropylene and the basalt fiber are subjected to ultrasonic dispersion and interface combination optimization to form a three-dimensional anti-crack network, the component uniformity and the functional stability are ensured through precise proportioning, graded mixing and directional granulation, meanwhile, the waterproof agent is compatible with industrial production fluctuation, large-scale application reliability is ensured, and the problems that a traditional waterproof agent is single in function and insufficient in durability are solved.

The invention relates to the technical field of polyvinyl chloride, and discloses a preparation process of a high-strength and high-thermal-stability PVC (polyvinyl chloride) material for a decorative film, which comprises the following steps: mixing polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, cyano polyesteramide, a stabilizer, a plasticizer, an antioxidant and the like, extruding in a twin-screw extruder, and granulating, the PVC material with high strength and high thermal stability is obtained. The cyano polyesteramide can improve the compatibility between ABS and PVC, so that the material has better mechanical properties, the polyesteramide has a hyperbranched molecular chain structure and plays a certain role in toughening, the compatibility between ABS and PVC is better, the vicat softening temperature of the material is increased, the thermal stability of the material is enhanced, and when the cyano polyesteramide is applied to materials such as decorative films, the material has better mechanical properties. Decorative films and the like can have good heat resistance and are not prone to aging and yellowing.

The invention relates to a special engineering plastic polyethersulfone microcellular foam material and a preparation method thereof, belongs to the technical field of high polymer material foaming, and solves the problem that high foaming ratio, a microcellular structure and excellent mechanical properties cannot be simultaneously obtained when a macromolecular polyethersulfone material adopts an injection foaming technology in the prior art. The method comprises the following steps: step 1, pretreating raw materials; 2, melt blending: mixing the PES base material, the second component, the functional filler, the cross-linking agent and the foam stabilizer, carrying out melt blending, granulating, and drying to obtain granules; 3, injection foaming: injecting the granules into an injection machine, adding a composite foaming agent into the injection machine, mixing, and performing injection foaming molding to obtain an injection-molded foaming material; and 4, curing: irradiating the injection-molded foam material with rays to obtain the special engineering plastic PES microcellular foam material.

An MIM preparation method for an ultrahigh heat-conducting composite material based on diamonds and red copper. The method comprises the preparation of a mixture, internal mixing granulation, injection molding, and degreasing sintering. By means of the MIM process, not only can uniform mixing and high-density molding of diamonds and a red copper powder be achieved, thereby effectively overcoming the technical problems of non-uniform dispersity, low density, etc. during the preparation of a high-heat-conductivity composite material by means of a traditional process, but the shape and size of a product can also be accurately controlled, particularly during the production of a sheet material having a thickness of less than 1 mm; moreover, the heat conductivity (the heat conductivity thereof being up to 500-800 W / (m·K)) thereof is significantly improved and is significantly higher than that of a traditional metal material. In addition, by optimizing MIM process parameters and selecting raw materials having higher cost effectiveness, the present invention effectively reduces the production cost, such that large-scale use of the high heat-conducting composite material based on diamonds and red copper becomes possible, thereby satisfying the high-standard requirements of high-performance electronic equipment for heat dissipation materials.

The invention relates to the technical field of spray drying equipment, and discloses centrifugal spray drying equipment and a ceramic spray granulation drying method.The centrifugal spray drying equipment comprises a device body, an electric cabinet, an air heater and a spray drying bin, the spray drying bin is installed in the device body, and the electric cabinet and the air heater are fixedly installed at the top of the device body; a heating mechanism and an upwind mechanism are installed in the spray drying bin, and a discharging pipe is fixedly connected to the bottom of the spray drying bin. In the slurry particle heating and drying process, the interior of the spray drying bin can be heated at different temperatures in a sectional mode through the multiple air opening connecting rings, and in the slurry particle descending process, the ascending mechanism can adjust the descending speed and position of slurry particles; by means of sectional type heating, the heating time and heating uniformity of slurry particles are guaranteed, the problem that ceramic particles are broken due to the fact that the heating temperature is too high and heating is not uniform can be effectively solved, and therefore the production quality of the ceramic particles is remarkably improved.

A preparation and use method for an Nb5Si3 composite spheroidized powder. The preparation method comprises: A) mixing an Nb powder, an Si powder, PVA and water, and ball milling the resulting mixture to obtain a slurry; and subjecting the slurry to spray granulation and sieving, so as to obtain an Nb5Si3 composite agglomerated powder; and B) subjecting the Nb5Si3 composite agglomerated powder to plasma spheroidization to obtain the product. The use method comprises mixing the Nb5Si3 composite spheroidized powder with NbTiX, wherein X is three or more of Zr, Hf, V, Mo and Ta; Nb and Si in the raw materials are subjected to an in-situ reaction during a laser additive melting process; and in combination with a rapid solidification process, a submicron Nb5Si3 particle-reinforced Nb5Si3 / Nbss dual-phase alloy can be obtained. Compared with a cast alloy having the same components, the Nb5Si3 particle-reinforced phase can be greatly reduced from a size level of dozens of microns to a submicron level, which greatly reduces the brittleness of the particle-reinforced refractory alloy, and significantly improves the strength of the particle-reinforced refractory alloy.

The invention discloses a granulation device based on a double-screw extruder and a using method thereof.The granulation device comprises a draining and screening mechanism, the draining and screening mechanism comprises a bottom plate table, the top of the bottom plate table is fixedly connected with a heat-proof box through a support, and a hot melting cutting mechanism is installed on the upper portion of the heat-proof box; the right side of the top of the bottom plate table is fixedly connected with a leakage-proof frame through a support, and the left side of the top of the bottom plate table is fixedly connected with an air cylinder through a support. According to the granulation device based on the double-screw extruder and the use method of the granulation device, the draining and screening mechanism and the hot melting and cutting mechanism are used in a combined mode, and due to the arrangement of the two mechanisms, raw materials can be directly melted and cooled when being conveyed in the long conveying barrel, and the raw materials are pushed out in a semi-solidified state; and then the particles are directly cut into particles by the cutting knife, and the particles can be cooled and screened.

The invention relates to a production system and a production method of a polyhydroxyalkanoate paper-plastic composite material. The production system comprises an unwinding mechanism, a coating device, a drying device, a pressing device, a winding mechanism and a post-processing device, wherein the unwinding mechanism is used for conveying base material paper; the coating device is used for coating the base material paper conveyed out by the unwinding mechanism and comprises an extrusion type coating machine head; the drying device is used for heating and drying the coated base material paper; the pressing device is used for pressing the dried base material paper; the winding mechanism is used for storing the laminated base material paper; and the post-processing device is used for performing post-processing on the laminated base material paper, and the post-processing device comprises an elastic roll mechanism and a drying box. According to the preparation method, an extrusion type coating process is adopted, extrusion granulation, high-temperature melt extrusion casting or film spraying forming of the polyhydroxyalkanoate is not needed, the degradation risk of the polyhydroxyalkanoate is avoided, degradation of the polyhydroxyalkanoate is reduced, and the production cost is reduced.

The invention relates to the technical field of protective films, and particularly discloses a composite glass protective paste for a flexible folding screen and a preparation method of the composite glass protective paste. The composite glass protection paste for the flexible folding screen sequentially comprises a functional base film, a first thermosetting polymer film, a UTG ultrathin glass layer, a second thermosetting polymer film and an OCA adhesive layer from top to bottom, the preparation method of the OCA adhesive layer comprises the following steps: carrying out activating treatment on nano silicon dioxide particles to obtain modified particles with cations on the surfaces; carrying out reaction on the modified particles and molten hydroxy acrylic resin under the ultrasonic action, and carrying out extrusion granulation to obtain elastic acrylic master batches; uniformly mixing the elastic acrylic master batch with a cross-linking agent and a photoinitiator to obtain the acrylic OCA; and coating OCA on one surface of the release film, and performing ultraviolet curing to obtain an OCA layer. According to the composite glass protection paste for the flexible folding screen, the bending resistance of the protection paste is improved.