CN111168921A - Constant-temperature constant-pressure continuous foaming forming device for microporous foam particle material and preparation method thereof - Google Patents
Constant-temperature constant-pressure continuous foaming forming device for microporous foam particle material and preparation method thereof Download PDFInfo
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- CN111168921A CN111168921A CN202010147122.9A CN202010147122A CN111168921A CN 111168921 A CN111168921 A CN 111168921A CN 202010147122 A CN202010147122 A CN 202010147122A CN 111168921 A CN111168921 A CN 111168921A
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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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3461—Making or treating expandable particles
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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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/60—Measuring, controlling or regulating
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Abstract
The invention discloses a constant temperature and constant pressure continuous foaming forming device of a microporous foam particle material, which comprises a frame, a constant pressure feeding system, a constant temperature and constant pressure air supply system and a constant temperature and constant pressure foaming system, wherein the constant pressure feeding system, the constant temperature and constant pressure air supply system and the constant temperature and constant pressure foaming system are arranged on the frame, a pressure balance pipeline is arranged on the constant pressure feeding system, the constant pressure feeding system provides constant pressure automatic feeding of the particle material, the constant temperature and constant pressure air supply system provides constant temperature and constant pressure gas and an isolating agent, then the constant temperature and constant pressure foaming system produces the microporous foam particle material by stirring the particle material, the gas and the isolating agent, the pressure balance pipeline ensures that the air pressure of the constant pressure feeding system is equal to that of the constant temperature and constant pressure foaming system, the constant pressure feeding system releases excessive pressure inside through the pressure balance valve, the device has, the pressure is invariable, and the foam forming quality is stable, can foam the shaping in succession, advantage that production efficiency is high.
Description
Technical Field
The invention relates to a forming device and a preparation method of a microporous foam particle material, in particular to a constant-temperature constant-pressure continuous foaming forming device and a preparation method of the microporous foam particle material.
Background
The microporous foam particle material is a novel foam material with micron-sized cell diameters, the cells are small and dense, the distribution is uniform, the polymer foam beads have the characteristics of light weight, buffering, high toughness, easy molding and the like, and compared with the traditional foam plastic with millimeter-sized cells, the microporous foam material has more excellent mechanical properties, dimensional stability, thermal stability, dielectric properties and the like, and has special application value in the fields of automobiles, airplanes and various transportation equipment; in addition, it can also be used in food package, biomedicine, building material, household electrical appliances, information engineering, sports equipment, etc. The traditional bead foaming technology is usually prepared by a high-pressure reaction kettle intermittent pressure release method or a continuous melt extrusion foaming forming method.
In a high-pressure reaction kettle foaming process, a heat-conducting medium (mainly water) is usually added and the reaction time is prolonged to achieve the effect of uniform temperature, then particles are sprayed out from the bottom of a pressure container in a rapid pressure relief mode to obtain foaming beads to realize the nucleation and growth of foam holes. And the material heating time is long, the energy consumption is high, the post-treatment separation drying procedure is added, and the production efficiency is low.
The common continuous microporous foamed material is produced through the steps of adding polymer material into a foaming extruder, melting the polymer material, injecting supercritical fluid into the polymer solution via the injection port of the cylinder, shearing and mixing to form homogeneous polymer-gas system, cooling to foaming temperature, extruding to foam, pelletizing, cooling and setting to obtain microporous foamed particle. However, this molding method has the disadvantages of unstable pressure, non-uniform mixing of supercritical fluid, low foam molding quality, unstable rate of expansion, slow cooling rate for molding, and low yield.
In recent years, semi-continuous foaming technology has been developed, which is a way to produce polymer microcellular foamed beads by a batch process.
Application publication No. CN 108410061A, the invention discloses a thermoplastic polymer expanded bead and a preparation method thereof, the preparation method comprises 1) extruding and granulating an expanded thermoplastic polymer resin composition to prepare particles to be expanded; 2) placing the particles to be foamed in a constant-temperature high-pressure reaction kettle A, and filling supercritical fluid for permeation and swelling to reach diffusion balance to form a polymer-supercritical fluid homogeneous phase system; 3) transferring the balanced particles to be foamed into a high-pressure reaction kettle B at constant pressure by adopting a magnetic sealing type stirring device; 4) and finally, discharging the materials in the high-pressure reaction kettle B under pressure through a quick-opening ball valve, and foaming and expanding the polymer particles to obtain the foamed beads.
The application publication number CN 108394060A relates to semi-continuous bead foaming equipment, which comprises a first high-pressure reaction kettle, a screw conveying device, a second high-pressure reaction kettle and a pressure compensation tank, wherein the first high-pressure reaction kettle is internally provided with a first stirring device, the screw conveying device is driven to work by a magnetic stirring device, the screw conveying device is connected with the first high-pressure reaction kettle and the second high-pressure reaction kettle, the second high-pressure reaction kettle is communicated with the pressure compensation tank, and the second high-pressure reaction kettle is communicated with the first high-pressure reaction kettle by a pressure balance pipe.
The authorization notice number CN 207210308U discloses a production line of polymer supercritical carbon dioxide foaming beads, which comprises a gas supply group, a heating group and a production group; the gas supply group comprises a carbon dioxide storage tank, a heat exchange device and a carbon dioxide buffer tank which are connected in sequence; the heating group comprises a heating rod and a heat conduction oil pump, the heating rod heats heating oil in the heat exchange device, and the heat conduction oil pump conveys the heat conduction oil to the gas supply group and the production group; the production group comprises a stirring reaction kettle, a high-pressure nozzle and a bead collecting tank; and an outlet at the bottom of the right barrel body of the carbon dioxide buffer tank is connected to an inlet at the left side of a bottom head of the stirring reaction kettle, and polymer beads are sprayed and foamed through a high-pressure nozzle from the outlet at the bottom of the stirring reaction kettle and are collected in a tank.
The technology comprises the steps of putting polymer particles into a reaction tank in batches, introducing carbon dioxide for pressurization, heating and stirring by a heating device, and spraying polymer beads to foam through a high-pressure nozzle at an outlet at the bottom of a stirring reaction tank.
The technology belongs to a semi-continuous mode for producing polymer microcellular foaming beads, can not realize continuous feeding and continuous foaming production, and has the defects of unstable production quality and low production efficiency.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a device and a preparation method thereof, wherein the device has the advantages of uniform temperature, constant pressure, stable foam molding quality and high production efficiency, is easy to obtain uniform foam bead products, can continuously supply polymer particle materials and supercritical mixed fluid, and can continuously foam and mold at constant temperature and constant pressure.
In order to achieve the purpose, the invention provides a constant-temperature constant-pressure continuous foaming and forming device for a microporous foam granular material, which comprises a machine frame, a constant-pressure feeding system arranged on one side of the machine frame and used for carrying out constant-pressure automatic feeding on the granular material, a constant-temperature constant-pressure air supply and liquid supply system arranged on one side of the constant-pressure feeding system, and a constant-temperature constant-pressure foaming system arranged below the constant-pressure feeding system, wherein a pressure balance pipeline is arranged between the constant-pressure feeding system and the constant-temperature constant-pressure foaming system, and a pressure balance valve is arranged on the constant-pressure.
Preferably, constant voltage charge-in system is including installing the polymer granule storage tank in the frame, the pressure feeder that is linked together with the polymer granule storage tank, the constant voltage storage tank that is linked together with the pressure feeder, install feeder and the second control valve between polymer granule storage tank and pressure feeder, install booster pump and the relief valve that is linked together with the pressure feeder in pressure feeder one side respectively, install the first control valve between booster pump and pressure feeder, install the third control valve between pressure feeder and constant voltage storage tank, and install the ration feeder below the constant voltage storage tank, pressure balance pipeline and pressure balance valve are linked together with the constant voltage storage tank respectively.
Preferably, the constant temperature and constant pressure gas supply system comprises a liquid nitrogen storage tank, a liquid carbon dioxide storage tank and an isolation agent liquid storage tank which are respectively arranged on one side of the frame, a nitrogen constant pressure and constant temperature storage tank communicated with the liquid nitrogen storage tank, a carbon dioxide constant pressure and constant temperature storage tank communicated with the liquid carbon dioxide storage tank, a first high pressure pump arranged between the liquid carbon dioxide storage tank and the carbon dioxide constant pressure and constant temperature storage tank, a first gas heater arranged between the first high pressure pump and the carbon dioxide constant pressure and constant temperature storage tank, a second high pressure pump arranged between the liquid nitrogen storage tank and the nitrogen constant pressure and constant temperature storage tank, a second gas heater arranged between the second high pressure pump and the nitrogen constant pressure and constant temperature storage tank, the gas in the nitrogen constant pressure and constant temperature storage tank and the gas in the carbon dioxide constant pressure and constant temperature storage tank are converged and then, the gaseous department of converging of nitrogen gas constant voltage constant temperature holding vessel and carbon dioxide constant voltage constant temperature holding vessel has installed third gas heater, between third gas heater and the nitrogen gas constant voltage constant temperature holding vessel all installed flow control valve between third gas heater and the carbon dioxide constant voltage constant temperature holding vessel, isolation agent liquid holding vessel is linked together with constant temperature constant voltage foaming system, liquid heater has been installed between isolation agent liquid holding vessel and the constant temperature constant voltage foaming system, the liquid transport high-pressure pump has been installed between liquid heater and the isolation agent liquid holding vessel.
Preferably, constant temperature and constant pressure foaming system installs the driving motor who installs constant temperature and constant pressure stirring continuous propeller one side and frame fixed connection including installing the constant temperature and constant pressure stirring continuous propeller in the frame, installs the inside propulsion propeller that is connected with the driving motor transmission of constant temperature and constant pressure stirring continuous propeller, installs the foam particle holding vessel that is linked together with constant temperature and constant pressure stirring continuous propeller in constant temperature and constant pressure stirring continuous propeller discharge gate department, constant voltage feed system, constant temperature and constant pressure air feed system and pressure balance pipeline are linked together with constant temperature and constant pressure stirring continuous propeller respectively.
Preferably, the discharge port of the constant-temperature constant-pressure stirring continuous propeller is provided with an adjustable conical foaming particle nozzle communicated with the constant-temperature constant-pressure stirring continuous propeller.
Preferably, the constant-temperature constant-pressure stirring continuous propeller is internally provided with screw pins and dispersing pins which are arranged in an array.
Compared with the prior art, the constant-temperature constant-pressure continuous foaming forming device for the microporous foam particle material has the beneficial effects that:
the constant-pressure feeding system provides constant-pressure automatic feeding of particle materials for the constant-temperature and constant-pressure foaming system, meanwhile, the constant-temperature and constant-pressure air supply and liquid supply system provides constant-temperature and constant-pressure gas and an isolating agent for the constant-temperature and constant-pressure foaming system, the constant-temperature and constant-pressure foaming system produces the microcellular foam particle materials by stirring the particle materials, the gas and the isolating agent, the constant-pressure feeding system is communicated with the constant-temperature and constant-pressure foaming system through a pressure balance pipeline, and the air pressure of the constant-pressure feeding system and the air pressure of the constant-temperature and constant-pressure foaming system can be equal in the whole production process.
The invention also provides a preparation method of the microporous foam particle material by constant temperature and constant pressure continuous foaming, which comprises the following preparation steps:
s1, transferring the polymer particles in the polymer particle storage tank into a pressure feeder through a material conveyer, and quantitatively weighing the polymer particles by the pressure feeder;
s2, when the polymer particles in the pressure feeder reach a certain mass in the step S1, transferring the polymer particles in the pressure feeder into a constant pressure storage tank in a pressurizing mode, and when no material exists in the pressure feeder, recovering the inside of the pressure feeder to normal pressure through a communicating pressure relief valve, wherein the gas pressure in the constant pressure storage tank is 3-30MPa, and the temperature is 60-350 ℃;
s3, transferring the polymer particles in the constant-pressure storage tank in the step S2 to a constant-temperature constant-pressure stirring continuous propeller through a quantitative material conveyer, and simultaneously conveying nitrogen, carbon dioxide and a separant with constant temperature and constant pressure to the constant-temperature constant-pressure stirring continuous propeller through a flow control valve; the gas pressure of the nitrogen and carbon dioxide gas storage tank with constant temperature and constant pressure is 3-30MPa, and the temperature is 60-350 ℃; the liquid pressure of the separant is 3-30MPa, and the temperature is 60-350 ℃; the rotating speed of the constant-temperature constant-pressure stirring continuous propeller is 10-1000 rpm;
s4, stirring the polymer particles, nitrogen, carbon dioxide and the separant inside the constant-temperature and constant-pressure stirring continuous propeller in the step S3 in a mode of driving a propeller of the constant-temperature and constant-pressure stirring continuous propeller by a motor, conveying the microporous foam particle materials formed after stirring forward under the driving of the propeller of the constant-temperature and constant-pressure stirring continuous propeller, spraying the particle materials at constant pressure through an adjustable conical foam particle nozzle, releasing the pressure at a rate of 1-1000 MPa/sec, finally forming a microporous foam particle product, and collecting the microporous foam particle product at a discharge port to obtain a product with the density of 0.6-0.01 g/cm3The constant temperature and constant pressure stirring continuous propeller and the constant pressure storage tank in the step S3 are communicated by a pressure balance pipeline in the whole process, and a pressure balance valve is arranged on the constant pressure storage tank.
Preferably, the nitrogen gas is formed by heating liquid nitrogen and the carbon dioxide is formed by heating liquid carbon dioxide in step S3.
Preferably, in the step S4, the discharge port of the constant-temperature constant-pressure stirring continuous propeller is connected to an adjustable conical foaming particle nozzle to adjust the constant pressure drop and pressure relief rate of the system, so as to ensure that the system continuously sprays the microporous foaming beads at a constant pressure to obtain the microporous foaming beads with a density of 0.6-0.01 g/cm3The microcellular expanded bead product of (1).
Preferably, in the step S4, the screw pins and the dispersing pins are arranged inside the constant-temperature constant-pressure stirring continuous propeller to mix and disperse the particulate materials so as to ensure the uniformity of the temperature and prevent the particulate materials from being adhered.
Compared with the prior art, the preparation method of the microporous foam particle material provided by the invention has the beneficial effects that:
the method can continuously supply constant-temperature and constant-pressure continuous foaming molding of the polymer particle materials and the foaming gas, ensures the constancy of pressure drop in the pressure release process, and finally obtains the polymer foaming bead products with uniform quality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a constant temperature and pressure continuous foaming and molding device for microcellular foam granular materials provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1, the present invention provides a constant temperature and constant pressure continuous foaming and forming device for microcellular foam particle materials, which comprises a frame, a constant pressure feeding system 1 installed at one side of the frame for constant pressure automatic feeding of particle materials, a constant temperature and constant pressure air and liquid supply system 2 installed at one side of the constant pressure feeding system 1, and a constant temperature and constant pressure foaming system 3 installed below the constant pressure feeding system 1, wherein a pressure balance pipeline 4 is arranged between the constant pressure feeding system 1 and the constant temperature and constant pressure foaming system 3, and a pressure balance valve 5 is installed on the constant pressure feeding system 1.
Specifically, the constant pressure feeding system 1 provides constant pressure automatic feeding of the particle material for the constant temperature and constant pressure foaming system 3, and the constant temperature and constant pressure gas supply system 2 provides constant temperature and constant pressure gas and isolating agent for the constant temperature and constant pressure foaming system 3, and further the constant temperature and constant pressure foaming system 3 produces the microcellular foam particle material by stirring the particle material, the gas is nitrogen and carbon dioxide in the embodiment, wherein the constant pressure feeding system 1 is communicated with the constant temperature and constant pressure foaming system 3 through a pressure balance pipeline 4, so that the air pressure of the constant pressure feeding system 1 and the constant temperature and constant pressure foaming system 3 in the whole production process can be ensured to be equal, in addition, the constant pressure feeding system 1 releases the internal overhigh pressure through a pressure balance valve 5, which ensures that the microcellular foam particle material is continuously foamed and molded at constant temperature and constant pressure, and improves the quality requirement, the foaming device has the advantages of compact structure, uniform temperature, constant pressure, stable foaming forming quality, continuous production and high production efficiency.
Specifically, the constant pressure feeding system 1 comprises a polymer particle storage tank 11, a pressure feeder 12, a constant pressure storage tank 13, a material conveyor 14, a second control valve 15, a booster pump 16, a pressure relief valve 17, a first control valve 18, a third control valve 19 and a quantitative material conveyor 20. The polymer particle storage tank 11 is communicated with the pressure feeder 12 through the material conveyor 14 and the second control valve 15, the pressure feeder 12 is communicated with the constant pressure storage tank 13 through the third control valve 19, the pressure relief valve 17 and the booster pump 16 are respectively arranged on one side of the pressure feeder 12 and communicated with the pressure feeder 12, the first control valve 18 is arranged between the booster pump 16 and the pressure feeder 12, the quantitative material conveyor 20 is arranged below the constant pressure storage tank 13, the polymer particles in the constant pressure storage tank 13 are conveyed into the constant temperature and constant pressure foaming system 3 through the quantitative material conveyor 20, and the pressure balance pipeline 4 and the pressure balance valve 5 are respectively communicated with the constant pressure storage tank 13.
Further, when the operation is performed, the first control valve 18 and the third control valve 19 are closed, the second control valve 15 is opened, the pressure feeder 12 is in a normal pressure state, the material conveyer 14 conveys the granular materials from the polymer granule storage tank 11 to the pressure feeder 12, when the pressure feeder 12 is full of the granular materials, the second control valve 15 is closed, the first control valve 18 is opened, the booster pump 16 applies pressure (the pressure is 5-30MPa), when the pressure is higher than the pressure of the constant pressure storage tank 13, the third control valve 19 is opened, the granular materials are conveyed from the pressure feeder 12 to the constant pressure storage tank 13 under the pressure effect, the granular materials are conveyed from the constant pressure storage tank 13 to the constant temperature and constant pressure foaming system 3 by the quantitative material conveyer 20, the pressure balance valve 5 is used for ensuring the pressure of the constant pressure storage tank 13 and the constant temperature and constant pressure foaming system 3 to be balanced, the pressure relief valve 17 is used for evacuating the pressure inside the pressure feeder 12, the inside of the pressure feeder 12 is recovered to the normal pressure, so that the constant-pressure storage tank 13 can supply materials for the constant-temperature and constant-pressure foaming system 3 by using the constant air pressure, the stability of the foaming and forming quality of products is ensured, and the qualification rate and the production efficiency of the products are improved.
Specifically, the constant-temperature and constant-pressure gas and liquid supply system 2 comprises a liquid nitrogen storage tank 21, a liquid carbon dioxide storage tank 22, a separant liquid storage tank 6, a nitrogen constant-pressure and constant-temperature storage tank 23, a carbon dioxide constant-pressure and constant-temperature storage tank 24, a first high-pressure pump 25, a first gas heater 26, a second high-pressure pump 27, a second gas heater 28, a third gas heater 29, a liquid heater 61 and a liquid delivery high-pressure pump 62. Wherein the liquid nitrogen storage tank 21 is communicated with the nitrogen constant-pressure constant-temperature storage tank 23 through a second high-pressure pump 27 and a second gas heater 28, the liquid carbon dioxide storage tank 22 is communicated with the carbon dioxide constant-pressure constant-temperature storage tank 24 through a first high-pressure pump 25 and a first gas heater 26, the gases in the nitrogen constant-pressure constant-temperature storage tank 23 and the carbon dioxide constant-pressure constant-temperature storage tank 24 are converged and then enter the constant-temperature constant-pressure foaming system 3 through a third gas heater 29, wherein flow control valves 30 are respectively arranged between the third gas heater 29 and the nitrogen constant-pressure constant-temperature storage tank 23 and between the third gas heater 29 and the carbon dioxide constant-pressure constant-temperature storage tank 24, the separant liquid storage tank 6 is communicated with the constant-temperature constant-pressure foaming system 3 through a liquid conveying high-pressure pump 62 and a liquid heater 61, wherein the gas pressure, the temperature is 60-350 ℃.
Further, a liquid nitrogen storage tank 21 and a liquid carbon dioxide storage tank 22 are used for storing liquid media, liquid carbon dioxide is pressurized by a first high-pressure pump 25 and is input into a carbon dioxide constant-pressure constant-temperature storage tank 24 for storage by a first gas heater 26, liquid nitrogen is conveyed into a nitrogen constant-pressure constant-temperature storage tank 23 for storage by a second high-pressure pump 27 and a second gas heater 28 (the pressure and the temperature of the two gases are the same, the pressure is 3-30MPa, and the temperature is 60-350 ℃), and the gases respectively pass through a flow control valve 30 and the gas heater 3 and enter a constant-temperature constant-pressure foaming system 3. In addition, the liquid isolating agent in the isolating agent liquid storage tank 6 is pressurized to the pressure of 3-30MPa through the liquid conveying high-pressure pump 62 and the liquid heater 61, the liquid is heated to the set temperature (the temperature range is 60-300 ℃), and then the liquid is conveyed into the constant-temperature constant-pressure foaming system 3.
Specifically, the constant temperature and constant pressure foaming system 3 comprises a constant temperature and constant pressure stirring continuous propeller 31, a driving motor 32, a propelling propeller 33 and a foam particle storage tank 34, wherein the driving motor 32 is installed on one side of the constant temperature and constant pressure stirring continuous propeller 31 and is fixedly connected with the frame, the propelling propeller 33 is installed inside the constant temperature and constant pressure stirring continuous propeller 31 and is in transmission connection with the driving motor 32, the foam particle storage tank 34 is installed at the discharge port of the constant temperature and constant pressure stirring continuous propeller 31 and is communicated with the constant temperature and constant pressure stirring continuous propeller 31, in addition, the constant pressure feeding system 1, the constant temperature and constant pressure air supply system 2 and the pressure balance pipeline 4 are respectively communicated with the constant temperature.
Further, in this embodiment, the polymer particles inside the constant pressure storage tank 13 of the constant pressure feeding system 1 are conveyed into the constant temperature and constant pressure stirring continuous propeller 31 through the quantitative feeder 20, the nitrogen gas, the carbon dioxide gas and the isolation agent in the constant temperature and constant pressure gas supply system 2 can be conveyed into the constant temperature and constant pressure stirring continuous propeller 31 at constant temperature and constant pressure, wherein the constant pressure storage tank 13 is connected with the constant temperature and constant pressure stirring continuous propeller 31 through the pressure balance pipe 4, so that the pressure inside the constant pressure storage tank 13 and the constant temperature and constant pressure stirring continuous propeller 31 can be kept consistent, and the constant temperature and constant pressure stirring continuous propeller 31 is driven by the driving motor 32 to rotate, wherein the rotating speed of the constant temperature and constant pressure stirring continuous propeller is 10-1000 rpm, the particle materials are conveyed forward under the driving of the propeller 33 until the particle materials are ejected from the discharge port of the constant temperature and constant pressure stirring continuous propeller 31 into the foam particle storage, the technical scheme has the advantages of simple process, easiness in realization and high stability, ensures the quality stability of product foaming molding, and improves the qualification rate and the production efficiency of products.
The constant temperature and constant pressure foaming system 3 can also comprise an adjustable conical foaming particle nozzle 35 which is arranged at the discharge port of the constant temperature and constant pressure stirring continuous propeller 31, the particle materials are sprayed out at constant pressure from the adjustable conical foaming particle nozzle 35, the pressure relief rate is 1-1000 MPa/s, and finally, the microcellular foaming particle product is formed. The density of the microcellular foamed particle product is controlled by adjusting the opening size of the conical foamed particle nozzle 35. Namely, the constant pressure drop and the pressure relief rate of the system are adjusted by adjusting the nozzle gap, so that the system is ensured to continuously spray the microporous foamed beads at constant pressure, and the density of the obtained foamed beads is 0.6-0.01 g/cm3The microcellular expanded bead product of (1).
Constant temperature and constant pressure foaming system 3 can also be including installing screw pin 36 and the dispersion pin 37 that is the array setting inside constant temperature and constant pressure stirring continuous propeller 31, when the granule material is carried forward under the drive of propelling propeller 33, the material is under screw pin 36 and dispersion pin 37's effect, mixes the homogeneity that the dispersion guaranteed the temperature, has still prevented granule material adhesion, improves the quality and the qualification rate of product.
Example two
The invention also provides a preparation method of the microporous foam particle material by constant temperature and constant pressure continuous foaming, which comprises the following preparation steps:
s1, transferring the polymer particles in the polymer particle storage tank into a pressure feeder through a material conveyer, and quantitatively weighing the polymer particles by the pressure feeder;
s2, when the polymer particles in the pressure feeder reach a certain mass in the step S1, transferring the polymer particles in the pressure feeder to a constant pressure storage tank in a pressurizing mode, and when no material exists in the pressure feeder, recovering the interior of the pressure feeder to normal pressure through a communicating pressure relief valve, wherein the gas pressure of the constant pressure storage tank is 3-30MPa, and the temperature is 60-350 ℃;
s3, transferring the polymer particles in the constant-pressure storage tank (with the pressure of 3-30MPa) in the step S2 to a constant-temperature constant-pressure stirring continuous propeller through a quantitative material conveyer, and simultaneously conveying nitrogen, carbon dioxide and a separant with constant temperature and constant pressure to the constant-temperature constant-pressure stirring continuous propeller through a flow control valve, wherein the gas pressure of a nitrogen and carbon dioxide gas storage tank with constant temperature and constant pressure is 3-30MPa, and the temperature is 60-350 ℃; the pressure of the separant liquid is 3-30MPa, and the temperature is 60-350 ℃; the rotating speed of the constant-temperature constant-pressure stirring continuous propeller is 10-1000 rpm;
s4, stirring the polymer particles, nitrogen, carbon dioxide and the separant inside the constant-temperature and constant-pressure stirring continuous propeller in the step S3 in a mode of driving a propeller of the constant-temperature and constant-pressure stirring continuous propeller by a motor, conveying the microporous foam particle materials formed after stirring forward under the driving of the propeller of the constant-temperature and constant-pressure stirring continuous propeller, spraying the particle materials at constant pressure through an adjustable conical foam particle nozzle, releasing the pressure at a rate of 1-1000 MPa/sec, finally forming a microporous foam particle product, and collecting the microporous foam particle product at a discharge port to obtain a product with the density of 0.6-0.01 g/cm3The constant temperature and constant pressure stirring continuous propeller and the constant pressure storage tank in the step S3 are communicated by a pressure balance pipeline in the whole process, and a pressure balance valve is arranged on the constant pressure storage tank.
Specifically, in step S3, the nitrogen gas is formed by heating liquid nitrogen, the carbon dioxide is formed by heating liquid carbon dioxide, and the release agent needs to be heated before being delivered to the constant-temperature constant-pressure stirring continuous propeller.
More specifically, in step S4, the constant pressure drop and the pressure relief rate of the system are adjusted by connecting an adjustable conical expanded bead nozzle to the discharge port of the constant temperature and constant pressure stirring continuous propeller, so as to ensure that the system continuously sprays the microcellular expanded bead product at a constant pressure. In the step S4, the screw pins and the dispersing pins are arranged inside the constant-temperature and constant-pressure stirring continuous propeller to mix and disperse the granular materials so as to ensure the uniformity of the temperature and prevent the granular materials from being adhered, thereby improving the quality and the qualification rate of the product.
The method can continuously supply constant-pressure continuous foaming molding of polymer particle materials and foaming gas, ensures constant pressure drop in the pressure release process, and finally obtains polymer foaming bead products with uniform quality.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. The utility model provides a continuous foaming forming device of constant temperature constant pressure of cellular foam granular material, includes the frame, its characterized in that still including installing constant voltage charge-in system (1) that is used for carrying out constant voltage autoloading to granular material in frame one side, install constant temperature constant pressure air feed liquid supply system (2) in constant voltage charge-in system (1) one side to and install constant temperature constant pressure foaming system (3) in constant voltage charge-in system (1) below, be provided with pressure balance pipeline (4) between constant voltage charge-in system (1) and constant temperature constant pressure foaming system (3), constant voltage charge-in system (1) facial make-up is equipped with pressure balance valve (5).
2. The constant temperature and pressure continuous foaming and molding apparatus of microcellular foam particulate materials according to claim 1, wherein the constant pressure feeding system (1) comprises a polymer particle storage tank (11) installed on the frame, a pressure feeder (12) communicated with the polymer particle storage tank (11), a constant pressure storage tank (13) communicated with the pressure feeder (12), a material feeder (14) and a second control valve (15) installed between the polymer particle storage tank (11) and the pressure feeder (12), a booster pump (16) and a pressure relief valve (17) respectively installed at one side of the pressure feeder (12) and communicated with the pressure feeder (12), a first control valve (18) installed between the booster pump (16) and the pressure feeder (12), a third control valve (19) installed between the pressure feeder (12) and the constant pressure storage tank (13), and a quantitative material conveyer (20) arranged below the constant-pressure material storage tank (13), wherein the pressure balance pipeline (4) and the pressure balance valve (5) are respectively communicated with the constant-pressure material storage tank (13).
3. The constant temperature and constant pressure continuous foaming and molding device of microcellular foam particle materials according to claim 1, wherein the constant temperature and constant pressure gas supply and liquid supply system (2) comprises a liquid nitrogen storage tank (21), a liquid carbon dioxide storage tank (22) and a liquid insulating agent storage tank (6) respectively installed at one side of the frame, a nitrogen constant pressure and constant temperature storage tank (23) communicated with the liquid nitrogen storage tank (21), a carbon dioxide constant pressure and constant temperature storage tank (24) communicated with the liquid carbon dioxide storage tank (22), a first high pressure pump (25) installed between the liquid carbon dioxide storage tank (22) and the carbon dioxide constant pressure and constant temperature storage tank (24), a first gas heater (26) installed between the first high pressure pump (25) and the carbon dioxide constant pressure and constant temperature storage tank (24), a second high pressure pump (27) installed between the liquid nitrogen storage tank (21) and the nitrogen constant pressure and constant temperature storage tank (23), install second gas heater (28) between second high-pressure pump (27) and nitrogen gas constant voltage constant temperature holding vessel (23), enter into constant temperature constant voltage foaming system (3) after gaseous meeting in nitrogen gas constant voltage constant temperature holding vessel (23) and the carbon dioxide constant voltage constant temperature holding vessel (24), nitrogen gas constant voltage constant temperature holding vessel (23) and the gaseous department of converging of carbon dioxide constant voltage constant temperature holding vessel (24) have installed third gas heater (29), between third gas heater (29) and nitrogen gas constant voltage constant temperature holding vessel (23), flow control valve (30) have all been installed between third gas heater (29) and carbon dioxide constant voltage constant temperature holding vessel (24), isolator liquid holding vessel (6) are linked together with constant temperature constant voltage foaming system (3), liquid heater (61) have been installed between isolator liquid holding vessel (6) and constant temperature constant voltage foaming system (3), and a liquid conveying high-pressure pump (62) is arranged between the liquid heater (61) and the separant liquid storage tank (6).
4. The constant temperature and pressure continuous foaming and molding device of microcellular foam granular material according to claim 1, it is characterized in that the constant temperature and constant pressure foaming system (3) comprises a constant temperature and constant pressure stirring continuous propeller (31) arranged on the frame, a driving motor (32) arranged on one side of the constant temperature and constant pressure stirring continuous propeller (31) and fixedly connected with the frame, a propelling propeller (33) arranged inside the constant temperature and constant pressure stirring continuous propeller (31) and in transmission connection with the driving motor (32), and a foam particle storage tank (34) arranged at the discharge port of the constant temperature and constant pressure stirring continuous propeller (31) and communicated with the constant temperature and constant pressure stirring continuous propeller (31), the constant-pressure feeding system (1), the constant-temperature and constant-pressure air and liquid supply system (2) and the pressure balance pipeline (4) are respectively communicated with the constant-temperature and constant-pressure stirring continuous propeller (31).
5. The constant temperature and pressure continuous foaming and molding device for microcellular foam granular materials as claimed in claim 4, wherein the discharge port of the constant temperature and pressure stirring continuous propeller (31) is provided with an adjustable conical foaming granule nozzle (35) communicated with the constant temperature and pressure stirring continuous propeller (31).
6. The constant temperature and pressure continuous foaming and molding device for microcellular foam granular materials as claimed in claim 4, wherein the constant temperature and pressure stirring continuous propeller (31) is internally provided with screw pins (36) and dispersion pins (37) arranged in an array.
7. A method for preparing a microporous foam granular material by constant temperature and constant pressure continuous foaming is characterized by comprising the following preparation steps:
s1, transferring the polymer particles in the polymer particle storage tank into a pressure feeder through a material conveyer, and quantitatively weighing the polymer particles by the pressure feeder;
s2, when the polymer particles in the pressure feeder reach a certain mass in the step S1, transferring the polymer particles in the pressure feeder to a constant pressure storage tank in a pressurizing mode, and when no material exists in the pressure feeder, recovering the normal pressure in the pressure feeder through a communicating pressure relief valve, wherein the gas pressure of the constant pressure storage tank is 3-30MPa, and the temperature is 60-350 ℃;
s3, transferring the polymer particles in the constant-pressure storage tank in the step S2 to a constant-temperature constant-pressure stirring continuous propeller through a quantitative material conveyer, and simultaneously conveying nitrogen, carbon dioxide and a separant with constant temperature and constant pressure to the constant-temperature constant-pressure stirring continuous propeller through a flow control valve, wherein the pressure of the nitrogen and carbon dioxide gas storage tank with constant temperature and constant pressure is 3-30MPa, and the temperature is 60-350 ℃; the liquid pressure of the separant is 3-30MPa, and the temperature is 60-350 ℃; the rotating speed of the constant-temperature constant-pressure stirring continuous propeller is 10-1000 rpm;
s4, stirring the polymer particles, nitrogen, carbon dioxide and the separant inside the constant-temperature and constant-pressure stirring continuous propeller in the step S3 in a mode of driving a propeller of the constant-temperature and constant-pressure stirring continuous propeller by a motor, conveying the microporous foam particle materials formed after stirring forward under the driving of the propeller of the constant-temperature and constant-pressure stirring continuous propeller, spraying the particle materials at constant pressure through an adjustable conical foam particle nozzle, releasing the pressure at a rate of 1-1000 MPa/sec, finally forming a microporous foam particle product, and collecting the microporous foam particle product at a discharge port to obtain a product with the density of 0.6-0.01 g/cm3The constant temperature and constant pressure stirring continuous propeller and the constant pressure storage tank in the step S3 are communicated by a pressure balance pipeline in the whole process, and a pressure balance valve is arranged on the constant pressure storage tank.
8. The method as claimed in claim 7, wherein the nitrogen gas is formed by heating liquid nitrogen and the carbon dioxide is formed by heating liquid carbon dioxide in step S3.
9. The method according to claim 7, wherein the discharge port of the stirring auger is connected to an adjustable conical foaming particle nozzle to adjust the constant pressure drop and pressure relief rate of the system in step S4, so as to ensure the system continuously spray the microporous foaming beads at a constant pressure and obtain a density of 0.6 ℃0.01g/cm3The microcellular expanded bead product of (1).
10. The method as claimed in claim 7, wherein the screw pin and the dispersing pin are disposed inside the continuous stirring propeller at constant temperature and constant pressure to mix the dispersed particulate materials to ensure temperature uniformity and prevent the particulate materials from sticking together in step S4.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111632549A (en) * | 2020-06-30 | 2020-09-08 | 安徽锐达橡胶科技有限公司 | Continuous automatic production system and method applied to modified asphalt |
| CN112976458A (en) * | 2021-03-11 | 2021-06-18 | 山东大学 | Foaming device with temperature and pressure regulation and control system and foaming method and application thereof |
| CN114542959A (en) * | 2022-02-23 | 2022-05-27 | 北京丰润铭科贸有限责任公司 | Method for continuously supplying liquid carbon dioxide under constant pressure |
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2020
- 2020-03-05 CN CN202010147122.9A patent/CN111168921A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111632549A (en) * | 2020-06-30 | 2020-09-08 | 安徽锐达橡胶科技有限公司 | Continuous automatic production system and method applied to modified asphalt |
| CN112976458A (en) * | 2021-03-11 | 2021-06-18 | 山东大学 | Foaming device with temperature and pressure regulation and control system and foaming method and application thereof |
| CN114542959A (en) * | 2022-02-23 | 2022-05-27 | 北京丰润铭科贸有限责任公司 | Method for continuously supplying liquid carbon dioxide under constant pressure |
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