CN215825772U - Mould for improving supercritical mould pressing micropore foaming quality by ultrasonic vibration - Google Patents
Mould for improving supercritical mould pressing micropore foaming quality by ultrasonic vibration Download PDFInfo
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- CN215825772U CN215825772U CN202121228586.9U CN202121228586U CN215825772U CN 215825772 U CN215825772 U CN 215825772U CN 202121228586 U CN202121228586 U CN 202121228586U CN 215825772 U CN215825772 U CN 215825772U
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Abstract
The utility model discloses a die for improving supercritical die pressing micropore foaming quality by ultrasonic vibration. The mould comprises a convex template, a concave template, an ultrasonic vibration device and a pressure control device, wherein a foaming chamber is formed between the convex template and the concave template after the convex template and the concave template are assembled; the ultrasonic vibration device is connected with the foaming chamber, and the pressure control device is connected with the foaming chamber. The application method of the mold comprises the following steps: heating the mould to a foaming temperature; putting a polymer to be foamed into a mold, closing the mold, introducing a supercritical fluid, and simultaneously starting ultrasonic vibration; after foaming, reducing the pressure of a foaming chamber, and simultaneously increasing the frequency of ultrasonic vibration to nucleate gas in the polymer; and after opening the die, cooling and taking out the product. The method provided by the utility model can promote the gas to be uniformly dispersed through the action of ultrasonic vibration when the supercritical fluid is injected, and plays roles in reducing nucleation potential energy, promoting gas precipitation and reducing foaming resistance in a gas nucleation stage, so that a high-quality microcellular foaming product can be obtained.
Description
Technical Field
The utility model relates to the field of plastic processing, in particular to a die for improving supercritical die pressing micropore foaming quality by ultrasonic vibration.
Background
With the rapid development of science and technology, the polymer processing and forming technology is continuously abundant and innovative, wherein the polymer foaming and forming has rapidly become one of the important material processing methods in the modern plastic industry. Supercritical fluid, refers to a state in which a substance under such conditions exhibits both liquid and gaseous properties when both temperature and pressure are above a certain threshold. Because the supercritical fluid is environment-friendly, is easy to dissolve in polymers, has controllable foaming, and gradually becomes an important foaming agent for microcellular foaming molding.
The influence of ultrasonic vibration on the polymer foaming process is researched by scholars, and a vibration field is introduced into the extrusion foaming process in the literature (national honor, Zhou south bridge, research on the foaming technology of the ultramicropore plastic under a vibration force field, plastic, 2001), so that the effect of the vibration field can be provided to promote the uniform diffusion of gas and reduce the nucleation potential energy; the patent CN 105415566A introduces ultrasonic vibration in the injection molding process, an ultrasonic vibration device is arranged on a core, and cavitation of the ultrasonic vibration on the polymer is utilized to generate cells in the polymer so as to foam the polymer; in patent CN 102765161B, an ultrasonic vibration device is set in a foaming furnace for chemical foaming of polyolefin, and the polyolefin in a molten state after foaming is treated with ultrasonic waves to obtain a polyolefin material with uniform cells; patent CN 203622749U develops an ultrasonic controlled micro-foaming molding device, which installs an ultrasonic vibration device in an injection mold to control the diffusion speed and solubility of gas in polymer during foaming process, so as to obtain uniformly foamed material.
In summary, the existing technology has many disadvantages: firstly, the ultrasonic vibration is only used for injection molding foaming at present and is not suitable for the injection molding foaming; secondly, at present, ultrasonic vibration is mainly used for chemical foaming, but the supercritical foaming and the chemical foaming are obviously different, and the ultrasonic vibration assistance is not used in the supercritical foaming process; finally, at present, the ultrasonic vibration is mainly used for focusing on the diffusion or solubility of the gas, and the ultrasonic vibration is not applied to the process of improving the foaming nucleation.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model aims to provide a die for improving the foaming quality of supercritical die pressing micropores by ultrasonic vibration.
The utility model discloses a die for improving supercritical die pressing micropore foaming quality by ultrasonic vibration. The mold can promote gas to be uniformly dispersed through the action of ultrasonic vibration when supercritical fluid is injected, and plays roles in reducing nucleation potential energy, promoting gas precipitation and reducing foaming resistance in a gas nucleation stage, so that a high-quality microcellular foaming product can be obtained.
The purpose of the utility model is realized by at least one of the following technical solutions.
The utility model provides a die for improving the foaming quality of supercritical die pressing micropores by ultrasonic vibration, which comprises a convex die plate, a concave die plate, an ultrasonic vibration device and a pressure control device, wherein a foaming chamber is formed between the convex die plate and the concave die plate after the convex die plate and the concave die plate are assembled; the ultrasonic vibration device is connected with the foaming chamber, and the pressure control device is connected with the foaming chamber.
Further, the concave template is provided with a supercritical fluid channel, and the foaming chamber is connected with a supercritical fluid pump through the supercritical fluid channel.
Further, the ultrasonic vibration device comprises an ultrasonic vibration controller and an ultrasonic vibration working device; the ultrasonic vibration controller is connected with the ultrasonic vibration working device; the ultrasonic vibration working device comprises an ultrasonic vibration power device, a transmission rod and an ultrasonic vibration module; one end of the transmission rod is connected with the ultrasonic vibration power device, and the other end of the transmission rod is connected with the ultrasonic vibration module.
Further, the pressure control device comprises a pressure sensor and a pressure control working device; the pressure sensor is connected with the pressure control working device.
Preferably, the pressure work control device is one or more of a pressure control valve and a foaming chamber volume control device.
Further, when the pressure work control device selects a pressure control valve, the concave template is provided with an exhaust channel to connect the foaming chamber with the outside, and the pressure control valve is arranged on the exhaust channel; when the pressure work control device selects the foaming chamber volume control device, the foaming chamber volume control device comprises an upper die base plate, a lower die base plate and a base plate distance controller, the upper die base plate is connected with the convex die plate, the lower die base plate is connected with the concave die plate, and the base plate distance controller is respectively connected with the upper die base plate and the lower die base plate.
Furthermore, cooling water paths are arranged in the male die plate and the female die plate.
The utility model provides a method for preparing a foaming material by using a die for improving supercritical mould pressing micropore foaming quality by ultrasonic vibration, which comprises the following steps:
(1) heating the mould with the supercritical mould pressing micropore foaming quality improved by ultrasonic vibration to a foaming temperature, then placing a foaming polymer into a female mould plate, closing the male mould plate and the female mould, and forming a foaming chamber between the male mould plate and the female mould; introducing supercritical fluid into the foaming chamber, and simultaneously starting an ultrasonic vibration device (ultrasonic vibration is transmitted to the foaming polymer through a vibration rod or a vibration plate) to carry out foaming treatment;
(2) and reducing the pressure of the foaming chamber to nucleate, simultaneously increasing the frequency of ultrasonic vibration, carrying out nucleation treatment, cooling to room temperature, opening the die, and taking out the polymer in the foaming chamber to obtain the foaming material.
Further, the foaming temperature in the step (1) is 50-350 ℃;
further, the supercritical fluid in the step (1) is one of supercritical carbon dioxide and supercritical nitrogen;
further, in the step (1), after the supercritical fluid is introduced into the foaming chamber, in the foaming treatment process, the pressure in the foaming chamber is 5-25 Mpa;
further, the ultrasonic vibration frequency of the ultrasonic vibration device in the step (1) is 15 KHz-20 KHz;
further, the foaming time in the step (1) is 0.5-6 h;
further, the foaming polymer in the step (1) is thermoplastic plastics or rubber after pre-vulcanization.
Further, in the nucleation treatment process in the step (2), the pressure of the foaming chamber is 90-95% of the pressure during foaming treatment, and the frequency of ultrasonic vibration is 20-30 KHz;
further, the temperature of the nucleation treatment in the step (2) is 50-350 ℃, and the time of the nucleation treatment is 3-5 s.
Preferably, the nucleation time of step (2) is 5 s.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
(1) the utility model develops a die suitable for improving supercritical die pressing micropore foaming by ultrasonic vibration and provides a new research idea for die pressing micropore foaming forming.
(2) The utility model promotes the diffusion of gas in the polymer by adding the ultrasonic vibration with lower frequency in the supercritical fluid injection stage, so that the gas is more uniformly distributed in the polymer, and the formation of a product with uniform foam holes is promoted;
(3) according to the utility model, the pressure relief valve or the foaming chamber volume control device is utilized to realize the nucleation stage of the ultrasonic vibration acting on the supercritical foaming, and under the vibration field, bubble nuclei are subjected to shearing and stretching to generate three-dimensional orientation, so that the nucleation potential energy is reduced, the higher nucleation rate is favorably obtained, and thus a higher-quality micro-foaming product is prepared;
(4) the utility model discloses a method for improving the foaming quality of supercritical micropores, which is different from the mainstream method for improving the micropore quality of the existing micro-foaming product and provides reference for ultrasonic vibration in the field of supercritical micropore foaming.
Drawings
FIG. 1 is a flow chart of a method for improving foaming quality of supercritical molded micro-pores by ultrasonic vibration in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a mold for improving the foaming quality of supercritical molded micro-pores by ultrasonic vibration according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a mold for improving the foaming quality of supercritical molded micro-pores by ultrasonic vibration according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a mold for improving the foaming quality of supercritical molded micro-pores by ultrasonic vibration according to an embodiment of the present invention;
the device comprises a convex template 1, a red copper sealing ring 2, a supercritical fluid channel 3, a foaming chamber 4, a concave template 5, a polymer 6, an ultrasonic vibration power device 7, a transmission rod 8, an ultrasonic vibration template 9, an ultrasonic vibration controller 10, a rubber pad 11, a pressure control valve 12, a pressure sensor 13, a cooling water channel 14, an upper die base plate 15, a lower die base plate 16, a base plate distance controller 17 and an ultrasonic vibration rod 18.
FIG. 5 is an electron micrograph of the foamed materials prepared in example 2 and comparative example.
Detailed Description
The following examples are presented to further illustrate the practice of the utility model, but the practice and protection of the utility model is not limited thereto. It is noted that the processes described below, if not specifically described in detail, are all realizable or understandable by those skilled in the art with reference to the prior art. The reagents or apparatus used are not indicated to the manufacturer, and are considered to be conventional products available by commercial purchase.
Example 1
Referring to fig. 2, the die for improving the foaming quality of the supercritical die pressing micropores through ultrasonic vibration comprises a convex die plate 1, a concave die plate 5, an ultrasonic vibration device and a pressure control device, wherein when the convex die plate 1 and the concave die plate 5 are assembled, a foaming chamber 4 is formed between the convex die plate 1 and the concave die plate 5; the ultrasonic vibration device is connected with the foaming chamber 4, and the pressure control device is connected with the foaming chamber 4.
The cavity plate 5 is provided with a supercritical fluid channel 3, and the foaming chamber 4 is connected with a supercritical fluid pump through the supercritical fluid channel 3.
Referring to fig. 2, the number of the ultrasonic vibration devices may be set to one, and the ultrasonic vibration device includes an ultrasonic vibration controller 10 and an ultrasonic vibration working device; the ultrasonic vibration controller 10 is connected with the ultrasonic vibration working device; the ultrasonic vibration working device comprises an ultrasonic vibration power device 7, a transmission rod 8 and an ultrasonic vibration module 9; one end of the transmission rod 8 is connected with the ultrasonic vibration power device 7, and the other end of the transmission rod 8 is connected with the ultrasonic vibration module 9; the ultrasonic vibration module is an ultrasonic vibration plate which is arranged in the foaming chamber 4. A rubber pad 11 is arranged between the ultrasonic vibration module 9 and the concave template 5 so as to seal the foaming chamber 4.
Referring to fig. 4, the number of the ultrasonic vibration devices may be two or more, and the ultrasonic vibration devices include an ultrasonic vibration controller 10 and an ultrasonic vibration working device; the ultrasonic vibration controller 10 is connected with the ultrasonic vibration working device; the ultrasonic vibration working device comprises an ultrasonic vibration power device 7, a transmission rod 8 and an ultrasonic vibration module 9; one end of the transmission rod 8 is connected with the ultrasonic vibration power device 7, and the other end of the transmission rod 8 is connected with the ultrasonic vibration module 9; the ultrasonic vibration module is an ultrasonic vibration rod 18, and the ultrasonic vibration rod 18 is arranged in the foaming chamber 4.
The pressure control device comprises a pressure sensor 13 and a pressure control working device; the pressure sensor 13 is connected to a pressure control work device.
The pressure working control device is more than one of a pressure control valve 12 and a foaming chamber volume control device.
When the pressure work control device selects a pressure control valve, the concave template 4 is provided with an exhaust channel to connect the foaming chamber 4 with the outside, and the pressure control valve 12 is arranged on the exhaust channel.
Referring to fig. 3, when the pressure operation control device selects a foaming chamber volume control device, the foaming chamber 4 volume control device includes an upper mold base plate 15, a lower mold base plate 16 and a base plate distance controller 17, the upper mold base plate 15 is connected with the convex mold plate 1, the lower mold base plate 16 is connected with the concave mold plate 5, and the base plate distance controller 17 is respectively connected with the upper mold base plate 15 and the lower mold base plate 16.
And cooling water channels 14 are arranged in the male die plate 1 and the female die plate 5.
Example 2
Referring to fig. 1, a method for preparing a foamed material using a mold for improving supercritical molding microcellular foaming quality using ultrasonic vibration, comprising the steps of:
preparing a polymer to be foamed, namely pre-vulcanized nitrile rubber and a die for improving the foaming quality of the supercritical mould pressing micropores through ultrasonic vibration shown in figure 3, heating the die for improving the foaming quality of the supercritical mould pressing micropores through ultrasonic vibration to 70 ℃, then putting the pre-vulcanized nitrile rubber into a foaming chamber, closing the die, introducing supercritical carbon dioxide to ensure that the pressure of the foaming chamber is 15Mpa, starting an ultrasonic vibration device, and performing foaming treatment, wherein the ultrasonic vibration frequency is 15 KHz; the foaming time is 2 h; and the pressure control device reduces the pressure in the foaming chamber by 5 percent, carries out nucleation treatment, completely opens the die after the ultrasonic vibration frequency is 25KHz and the treatment time is 5s, and takes out the product after cooling to the room temperature to obtain the foaming material.
Comparative example
Comparative example a process for the preparation of a foamed material can be referred to that shown in example 2, with the only difference that: comparative example a foamed material was obtained without starting the ultrasonic vibration device during both the foaming treatment and the nucleation treatment.
The foamed materials of example 2 and comparative example were observed under an electron microscope (results are shown with reference to fig. 5), and the cell sizes and cell densities were counted in table 1 below.
TABLE 1
| Bubble size (mum) | Cell density (pieces/cm)3) | |
| Without ultrasound | 58.3 | 2.3*107 |
| With ultrasound | 52.5 | 3.2*107 |
Part a of fig. 5 is an SEM image of a comparative example of a foamed material produced without turning on the ultrasonic vibration device, and part b of fig. 5 is an SEM image of a foamed material produced in example 2 with the ultrasonic vibration device turned on;
from the statistics in table 1 and the SEM image of the cell morphology (fig. 5), it is seen that the supercritical die foaming treatment with ultrasound treatment does have some improvement in the foaming morphology.
The above examples are only preferred embodiments of the present invention, which are intended to be illustrative and not limiting, and those skilled in the art should understand that they can make various changes, substitutions and alterations without departing from the spirit and scope of the utility model.
Claims (7)
1. A mould for improving the foaming quality of supercritical mould pressing micropores through ultrasonic vibration is characterized by comprising a convex template, a concave template, an ultrasonic vibration device and a pressure control device, wherein a foaming chamber is formed between the convex template and the concave template after the convex template and the concave template are assembled; the ultrasonic vibration device is connected with the foaming chamber, and the pressure control device is connected with the foaming chamber.
2. The mold for improving the foaming quality of the supercritical molded microcells through the ultrasonic vibration according to claim 1, wherein the cavity plate is provided with a supercritical fluid channel, and the foaming chamber is connected with a supercritical fluid pump through the supercritical fluid channel.
3. The mold for improving the foaming quality of the supercritical molded microcells through ultrasonic vibration according to claim 1, wherein the ultrasonic vibration device comprises an ultrasonic vibration controller and an ultrasonic vibration working device; the ultrasonic vibration controller is connected with the ultrasonic vibration working device; the ultrasonic vibration working device comprises an ultrasonic vibration power device, a transmission rod and an ultrasonic vibration module; one end of the transmission rod is connected with the ultrasonic vibration power device, and the other end of the transmission rod is connected with the ultrasonic vibration module.
4. The mold for improving the foaming quality of the supercritical molded microcells through ultrasonic vibration according to claim 1, wherein the pressure control device comprises a pressure sensor and a pressure control working device; the pressure sensor is connected with the pressure control working device.
5. The mold for improving the foaming quality of the supercritical molded microcells through ultrasonic vibration according to claim 4, wherein the pressure working control device is one or more of a pressure control valve and a foaming chamber volume control device.
6. The mold for improving the foaming quality of the supercritical molded microcells through the ultrasonic vibration according to claim 5, wherein when the pressure operation control device selects a pressure control valve, the cavity plate is provided with an exhaust passage to connect the foaming chamber with the outside, and the pressure control valve is arranged on the exhaust passage; when the pressure work control device selects the foaming chamber volume control device, the foaming chamber volume control device comprises an upper die base plate, a lower die base plate and a base plate distance controller, the upper die base plate is connected with the convex die plate, the lower die base plate is connected with the concave die plate, and the base plate distance controller is respectively connected with the upper die base plate and the lower die base plate.
7. The mold for improving the foaming quality of the supercritical molded microcells by ultrasonic vibration according to any one of claims 1 to 6, wherein cooling water paths are provided in the male mold plate and the female mold plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121228586.9U CN215825772U (en) | 2021-06-02 | 2021-06-02 | Mould for improving supercritical mould pressing micropore foaming quality by ultrasonic vibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121228586.9U CN215825772U (en) | 2021-06-02 | 2021-06-02 | Mould for improving supercritical mould pressing micropore foaming quality by ultrasonic vibration |
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| CN215825772U true CN215825772U (en) | 2022-02-15 |
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| CN202121228586.9U Active CN215825772U (en) | 2021-06-02 | 2021-06-02 | Mould for improving supercritical mould pressing micropore foaming quality by ultrasonic vibration |
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