CN112519028A - Preparation method of high-rate conductive EPP beads - Google Patents
Preparation method of high-rate conductive EPP beads Download PDFInfo
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- CN112519028A CN112519028A CN202011355337.6A CN202011355337A CN112519028A CN 112519028 A CN112519028 A CN 112519028A CN 202011355337 A CN202011355337 A CN 202011355337A CN 112519028 A CN112519028 A CN 112519028A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/256—Exchangeable extruder parts
- B29C48/2566—Die parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/793—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling upstream of the plasticising zone, e.g. heating in the hopper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/82—Cooling
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
- C08J9/0071—Nanosized fillers, i.e. having at least one dimension below 100 nanometers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0085—Use of fibrous compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2201/00—Foams characterised by the foaming process
- C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
- C08J2201/03—Extrusion of the foamable blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/06—CO2, N2 or noble gases
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/08—Supercritical fluid
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2425/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
- C08J2425/02—Homopolymers or copolymers of hydrocarbons
- C08J2425/04—Homopolymers or copolymers of styrene
- C08J2425/06—Polystyrene
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- Polymers & Plastics (AREA)
- Mechanical Engineering (AREA)
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- Nanotechnology (AREA)
- Inorganic Chemistry (AREA)
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Abstract
The invention discloses a preparation method of high-magnification conductive EPP beads, wherein the EPP beads are prepared by a screw extruder and a foaming reaction kettle, the screw extruder comprises a bottom plate, the outer wall of one end of the top of the bottom plate is connected with a motor through a bolt, the outer wall of the top of the bottom plate, which is close to one side of the motor, is connected with a reduction gearbox through a bolt, an output shaft of the motor is connected with the interior of the reduction gearbox through a bearing, two support plates are welded on the outer wall of the top of the bottom plate, a material conveying pipe is welded on the outer wall of the top of the support plates, a screw is connected on the inner wall of one side of the reduction gearbox through a bearing and is connected on the inner. The invention can heat and melt the raw material in the feed hopper, improves the working efficiency, accelerates the forming speed, improves the grain cutting efficiency of the screw extruder, is convenient for adjusting the external diameter size of the raw material during extrusion, is convenient for adjusting the size of polypropylene particles, and improves the practicability.
Description
Technical Field
The invention relates to the technical field of EPP beads, in particular to a preparation method of a high-rate conductive EPP bead.
Background
EPP (polypropylene plastic foam material) is novel foam plastic, is a polypropylene plastic foam material, is a high-crystallization polymer/gas composite material with excellent performance, and becomes the environment-friendly novel compression-resistant buffering heat-insulating material with the fastest growth due to unique and superior performance. EPP is also an environment-friendly material, can be recycled and can be naturally degraded without causing white pollution.
With the improvement of market requirements, the antistatic foamed polypropylene can not meet the requirements for the packaging and transportation of some electronic components, high-end laboratory equipment or other special fields and the like. Therefore, the applications of the foamed polypropylene of the semiconductive type and even the conductive type in these fields are continuously developed. At present, the production of the conductive expanded polypropylene beads basically comprises two ways. One is that the conductive function is realized by coating conductive auxiliary agent, namely uniformly coating the surface of the foamed polypropylene product with electric conduction. The method has the advantages of troublesome operation and high labor cost, and the conductive additive is difficult to coat uniformly and has short action time; and the other is through filling conductive filler in the formula and blending. In order to meet the requirement of higher conductivity, a large amount of conductive fillers, such as conductive carbon black, conductive graphite, etc., need to be filled into the resin matrix, and the filling of the conductive fillers in a large amount has an adverse effect on the foaming performance of the resin, so that the foam beads have uneven cell size and unstable conductivity, and especially cannot be produced at a high rate.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a preparation method of a high-rate conductive EPP bead.
The invention provides a preparation method of high-magnification conductive EPP beads, the EPP beads are prepared by a screw extruder and a foaming reaction kettle, the screw extruder comprises a bottom plate, the outer wall of one end of the top of the bottom plate is connected with a motor through a bolt, the outer wall of the top of the bottom plate, which is close to one side of the motor, is connected with a reduction box through a bolt, an output shaft of the motor is connected with the inside of the reduction box through a bearing, the outer wall of the top of the bottom plate is welded with two support plates, a material conveying pipe is welded on the outer wall of the top of the support plates, the inner wall of one side of the reduction box is connected with a screw through a bearing, the screw is connected on the inner wall of one side of the material conveying pipe through a bearing, a mounting frame with a U-shaped structure is welded on the outer wall of the top of the bottom plate, the utility model discloses a screw rod, including bottom plate, conveying pipeline, mounting tube, screw rod, bearing, fixing plate, bearing, fixing plate, water pump, mounting tube, bearing, fixing plate, water tank, water pump, mounting tube, fixing plate, water pump, bearing, fixing plate, water tank, water pump, water outlet end, mounting tube, fixing plate.
Preferably, the screw comprises a delivery end and an extrusion end, and the pitch of the delivery end is greater than the pitch of the extrusion end.
Preferably, a cavity is reserved in the heating grid plate, and heating wires distributed at equal intervals are arranged in the cavity.
Preferably, the feed hopper bottom inner wall is gone up to cup joint has the inlet pipe, and inlet pipe bottom is linked together with the conveying pipeline is inside.
Preferably, the outer wall of one end of the top of the water tank is provided with a water inlet, and the inner wall of the water inlet is sleeved with a water inlet pipe.
Preferably, the outer wall of the fixing ring is screwed with a fastening bolt, and the fastening bolt is in fastening fit with the transmission shaft.
A preparation method of high-rate conductive EPP beads comprises the following steps:
s1: mixing polypropylene resin and nano silver powder according to a certain proportion to obtain a first raw material;
s2: mixing polypropylene resin and conductive filler according to a certain proportion to obtain a second raw material;
s3: mixing and melting polypropylene resin, a raw material I, a raw material II and polystyrene, and obtaining polypropylene particles through a screw extruder;
s4: putting polypropylene particles, a dispersion medium and a dispersing agent into a near-foaming reaction kettle, continuously introducing supercritical carbon dioxide into the foaming reaction kettle, heating and pressurizing, quickly relieving pressure when the preset temperature and pressure are reached, and preserving heat for 20-30min at the temperature of 70-80 ℃ to obtain conductive EPP beads;
s5: and (4) cleaning, drying and shaping the conductive EPP beads.
Preferably, the particle size of the silver nanoparticles in step S1 is 40-80nm, and the weight percentages of the components in step 1 are as follows: 65-75% of polypropylene resin and 25-35% of nano silver powder, wherein the conductive filler in the step S2 is carbon fiber, and the weight percentage of each component in the step S2 is as follows: 80-90% of polypropylene resin and 10-20% of carbon fiber.
Preferably, the weight ratio of the polypropylene resin to the polystyrene in the step S3 is 95: 5-70: 30.
Preferably, the dispersing medium in step S4 is deionized water, the dispersing agent is cellulose nitrate, and the supercritical carbon dioxide is obtained under the conditions that the temperature is higher than 31.06 ℃ and the pressure is higher than 7.29 mpa.
The invention has the beneficial effects that:
1. a heating grid plate is arranged in the feed hopper of the screw extruder, the heating grid plate is connected to commercial power, and a heating wire heats the heating grid plate, so that raw materials in the feed hopper can be heated and melted, and the working efficiency is improved;
2. the water tank and the water pump are arranged, the water inlet pipe is connected to a water source, water is added into the water tank, the water pump is started, the water in the water tank is conveyed into the heat exchange pipe by the water pump to cool the raw material in the conveying pipe, the forming speed of the raw material is accelerated, and the granulating efficiency of the screw extruder is improved;
3. the fastening bolt on the clockwise rotation solid fixed ring for solid fixed ring can slide on the transmission shaft, can adjust the eager grain size of raw materials, and simultaneously, clockwise rotation extrudes the head, can change and extrude the head, and the external diameter size when being convenient for adjust the raw materials and extrude is convenient for adjust the size of polypropylene particle, has improved the practicality.
Drawings
Fig. 1 is a schematic perspective view of a method for preparing a high-magnification conductive EPP bead according to the present invention;
FIG. 2 is a schematic view of a feed delivery pipe structure of a method for preparing high-rate conductive EPP beads according to the present invention;
FIG. 3 is a schematic view of the structure of an extrusion head of the method for preparing high-magnification conductive EPP beads according to the present invention;
FIG. 4 is a schematic view of a screw structure of a method for preparing high-rate conductive EPP beads according to the present invention;
FIG. 5 is a schematic view of the sectional structure of a feed hopper of the method for preparing high-magnification conductive EPP beads according to the present invention;
FIG. 6 is a schematic cross-sectional view of a water tank of the method for preparing high-magnification conductive EPP beads according to the present invention;
fig. 7 is an enlarged structural diagram of a in fig. 3.
In the figure: 1 bottom plate, 2 motors, 3 reducing gear boxes, 4 supporting plates, 5 conveying pipelines, 6 screws, 7 mounting racks, 8 feed hoppers, 9 heating grid plates, 10 feeding pipes, 11 heat exchange pipes, 12 water tanks, 13 water pumps, 14 mounting pipes, 15 extrusion heads, 16 transmission shafts, 17 fixing rings, 18 mounting plates and 19 cutting knives.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-7, a method for preparing high-magnification conductive EPP beads, the EPP beads are prepared by a screw extruder and a foaming reaction kettle, the screw extruder comprises a bottom plate 1, a motor 2 is connected to the outer wall of one end of the top of the bottom plate 1 through a bolt, a reduction gearbox 3 is connected to the outer wall of one side of the top of the bottom plate 1 close to the motor 2 through a bolt, an output shaft of the motor 2 is connected to the inside of the reduction gearbox 3 through a bearing, two support plates 4 are welded to the outer wall of the top of the bottom plate 1, a material conveying pipe 5 is welded to the outer wall of the top of each support plate 4, a screw 6 is connected to the inner wall of one side of the reduction gearbox 3 through a bearing, the screw 6 comprises a conveying end and an extruding end, the screw pitch of the conveying end is larger than that of the extruding end, a mounting rack 7 with a U-shaped structure, and the outer wall of the top of the mounting frame 7 is sleeved with a feed hopper 8, the inner wall of the lower part of the feed hopper 8 is sleeved with a heating grid plate 9, a cavity is reserved in the heating grid plate 9, heating wires distributed at equal intervals are arranged in the cavity, so that raw materials in the feed hopper can be heated and melted, the working efficiency is improved, the inner wall of the bottom of the feed hopper 8 is sleeved with a feed pipe 10, the bottom end of the feed pipe 10 is communicated with the inside of a feed delivery pipe 5, the outer wall of the feed delivery pipe 5 is wound with a heat exchange pipe 11, the forming speed of the raw materials is accelerated, the granulating efficiency of a screw extruder is improved, the outer wall of the top of the bottom plate 1, which is positioned below the feed delivery pipe 5, is connected with a water tank 12 through bolts, two ends of the heat exchange pipe 11 are respectively communicated with the inside of the water tank 12, a water inlet is, and the delivery pipeline 5 is kept away from the one end outer wall of reducing gear box 3 and is cup jointed installation pipe 14, and the spiro union has extrusion head 15 on the installation pipe 14 inner wall, reducing gear box 3 one side is located and is connected with transmission shaft 16 through the bearing on the inner wall of screw rod 6 below, and transmission shaft 16 is connected on two backup pad 4 one sides outer wall through the bearing respectively, slip cap is equipped with solid fixed ring 17 on the outer wall of transmission shaft 16 one end, and the welding has mounting panel 18 on the solid fixed ring 17 outer wall, the spiro union has fastening bolt on the solid fixed ring 17 outer wall, and fastening bolt and transmission shaft 16 form the fastening fit, the external diameter size when being convenient for adjust the raw materials and extrude, be convenient for adjust the size of polypropylene particle, improved the practicality, fixedly connected with cutting knife 19 on the outer wall of mounting panel.
A preparation method of high-rate conductive EPP beads comprises the following steps:
s1: mixing polypropylene resin and nano silver powder according to a certain proportion to obtain a first raw material; the size of the nano silver powder particles in the step S1 is 40-80nm, and the weight percentage of each component in the step 1 is as follows: 65-75% of polypropylene resin and 25-35% of nano silver powder.
S2: mixing polypropylene resin and conductive filler according to a certain proportion to obtain a second raw material; the conductive filler in the step S2 is carbon fiber, and the weight percentages of the components in the step S2 are as follows: 80-90% of polypropylene resin and 10-20% of carbon fiber.
S3: mixing and melting polypropylene resin, a raw material I, a raw material II and polystyrene, and obtaining polypropylene particles through a screw extruder; in the step S3, the weight ratio of the polypropylene resin to the polystyrene is 95: 5-70: 30.
S4: putting polypropylene particles, a dispersion medium and a dispersing agent into a near-foaming reaction kettle, continuously introducing supercritical carbon dioxide into the foaming reaction kettle, heating and pressurizing, quickly relieving pressure when the preset temperature and pressure are reached, and preserving heat for 20-30min at the temperature of 70-80 ℃ to obtain conductive EPP beads; in the step S4, the dispersing medium is deionized water, the dispersing agent is cellulose nitrate, and the supercritical carbon dioxide is obtained under the conditions that the temperature is higher than 31.06 ℃ and the pressure is higher than 7.29 mpa.
S5: and (4) cleaning, drying and shaping the conductive EPP beads.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A preparation method of high-magnification conductive EPP beads is characterized in that the EPP beads are prepared by a screw extruder and a foaming reaction kettle, the screw extruder comprises a bottom plate (1), the outer wall of one end of the top of the bottom plate (1) is connected with a motor (2) through a bolt, the outer wall of the top of the bottom plate (1) close to one side of the motor (2) is connected with a reduction gearbox (3) through a bolt, an output shaft of the motor (2) is connected with the inside of the reduction gearbox (3) through a bearing, two support plates (4) are welded on the outer wall of the top of the bottom plate (1), a material conveying pipe (5) is welded on the outer wall of the top of the support plates (4), a screw rod (6) is connected on the inner wall of one side of the reduction gearbox (3) through a bearing, the screw rod (6) is connected on the inner wall of one side of the material conveying pipe (5), a feed hopper (8) is sleeved on the outer wall of the top of the mounting frame (7), a heating grid plate (9) is sleeved on the inner wall of the lower portion of the feed hopper (8), a heat exchange pipe (11) is wound on the outer wall of the feed conveying pipe (5), the outer wall of the top of the bottom plate (1) below the feed conveying pipe (5) is connected with a water tank (12) through a bolt, two ends of the heat exchange pipe (11) are respectively communicated with the inside of the water tank (12), a water pump (13) is fixedly connected on the inner wall of the bottom of the water tank (12), the water outlet end of the water pump (13) is connected with one end of the heat exchange pipe (11), an installation pipe (14) is sleeved on the outer wall of one end, away from the reduction gearbox (3), of the feed conveying pipe (5), an extrusion head (15) is screwed on the inner wall of the installation pipe (14), and transmission shaft (16) are connected on two backup pad (4) one side outer walls through the bearing respectively, the slip cap is equipped with solid fixed ring (17) on the outer wall of transmission shaft (16) one end, and the welding has mounting panel (18) on solid fixed ring (17) outer wall, fixedly connected with cutting knife (19) on the outer wall of mounting panel (18) one side.
2. The method for preparing high-magnification conductive EPP beads according to claim 1, wherein the screw (6) comprises a delivery end and an extrusion end, and the screw pitch of the delivery end is greater than that of the extrusion end.
3. The method for preparing high-magnification conductive EPP beads according to claim 1, wherein a feed pipe (10) is sleeved on the inner wall of the bottom of the feed hopper (8), and the bottom end of the feed pipe (10) is communicated with the inside of the feed delivery pipe (5).
4. The method for preparing high-rate conductive EPP beads according to claim 1, wherein cavities are left in the heating grid plate (9), and heating wires are distributed in the cavities at equal intervals.
5. The method for preparing high-rate conductive EPP beads according to claim 1, wherein a water inlet is opened on the outer wall of one end of the top of the water tank (12), and a water inlet pipe is sleeved on the inner wall of the water inlet.
6. The method for preparing high-rate conductive EPP beads according to claim 1, wherein the outer wall of the fixing ring (17) is screwed with a fastening bolt, and the fastening bolt and the transmission shaft (16) form a fastening fit.
7. The method for preparing high-rate conductive EPP beads according to claim 1, which comprises the following steps:
s1: mixing polypropylene resin and nano silver powder according to a certain proportion to obtain a first raw material;
s2: mixing polypropylene resin and conductive filler according to a certain proportion to obtain a second raw material;
s3: mixing and melting polypropylene resin, a raw material I, a raw material II and polystyrene, and obtaining polypropylene particles through a screw extruder;
s4: putting polypropylene particles, a dispersion medium and a dispersing agent into a near-foaming reaction kettle, continuously introducing supercritical carbon dioxide into the foaming reaction kettle, heating and pressurizing, quickly relieving pressure when the preset temperature and pressure are reached, and preserving heat for 20-30min at the temperature of 70-80 ℃ to obtain conductive EPP beads;
s5: and (4) cleaning, drying and shaping the conductive EPP beads.
8. The method for preparing high-magnification conductive EPP beads according to claim 7, wherein the particle size of the silver nanoparticles in step S1 is 40-80nm, and the weight percentages of the components in step 1 are as follows: 65-75% of polypropylene resin and 25-35% of nano silver powder, wherein the conductive filler in the step S2 is carbon fiber, and the weight percentage of each component in the step S2 is as follows: 80-90% of polypropylene resin and 10-20% of carbon fiber.
9. The method for preparing high-magnification conductive EPP beads according to claim 7, wherein the weight ratio of the polypropylene resin to the polystyrene in the step S3 is 95: 5-70: 30.
10. The method for preparing high-magnification conductive EPP beads according to claim 7, wherein the dispersion medium in step S4 is deionized water, the dispersant is cellulose nitrate, and the supercritical carbon dioxide is obtained under the conditions of temperature higher than 31.06 ℃ and pressure higher than 7.29 mpa.
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| CN202011355337.6A CN112519028A (en) | 2020-11-27 | 2020-11-27 | Preparation method of high-rate conductive EPP beads |
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|---|---|---|---|---|
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| CN107433695A (en) * | 2017-08-10 | 2017-12-05 | 三明华盈塑胶有限公司 | A kind of plastic molten melt prilling granulator |
| CN107828134A (en) * | 2017-10-16 | 2018-03-23 | 无锡会通轻质材料股份有限公司 | A kind of preparation method of highly conductive high-fire-resistance polypropylene foaming beads |
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| CN208468790U (en) * | 2018-04-08 | 2019-02-05 | 河南松亚新材料科技有限公司 | A kind of plastic granulating equipment |
| CN110054835A (en) * | 2019-03-27 | 2019-07-26 | 无锡会通轻质材料股份有限公司 | A kind of preparation method of high magnification conductivity type polypropylene foaming beads |
| CN209580156U (en) * | 2019-01-09 | 2019-11-05 | 福建省卓睿新材料科技有限公司 | A kind of anti-sticky rubber granulation device |
| CN110682468A (en) * | 2019-10-31 | 2020-01-14 | 唐承细 | Temperature-controllable granulating equipment beneficial to plastic extrusion and high in yield |
| CN211868301U (en) * | 2019-10-16 | 2020-11-06 | 天津斯坦利新型材料有限公司 | Numerical control EPS granulating device |
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| CN104292607A (en) * | 2014-10-22 | 2015-01-21 | 东莞市德诚塑化科技有限公司 | Ultralow-resistance conductive plastic and preparation method thereof |
| CN107433695A (en) * | 2017-08-10 | 2017-12-05 | 三明华盈塑胶有限公司 | A kind of plastic molten melt prilling granulator |
| CN107828134A (en) * | 2017-10-16 | 2018-03-23 | 无锡会通轻质材料股份有限公司 | A kind of preparation method of highly conductive high-fire-resistance polypropylene foaming beads |
| CN208468790U (en) * | 2018-04-08 | 2019-02-05 | 河南松亚新材料科技有限公司 | A kind of plastic granulating equipment |
| CN208052339U (en) * | 2018-04-12 | 2018-11-06 | 邦丽达(福建)新材料股份有限公司 | A kind of particle manufacture equipment for water-absorbing resins production |
| CN209580156U (en) * | 2019-01-09 | 2019-11-05 | 福建省卓睿新材料科技有限公司 | A kind of anti-sticky rubber granulation device |
| CN110054835A (en) * | 2019-03-27 | 2019-07-26 | 无锡会通轻质材料股份有限公司 | A kind of preparation method of high magnification conductivity type polypropylene foaming beads |
| CN211868301U (en) * | 2019-10-16 | 2020-11-06 | 天津斯坦利新型材料有限公司 | Numerical control EPS granulating device |
| CN110682468A (en) * | 2019-10-31 | 2020-01-14 | 唐承细 | Temperature-controllable granulating equipment beneficial to plastic extrusion and high in yield |
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Application publication date: 20210319 |