CN111055421A - Environment-friendly foaming process and forming equipment for thermoplastic elastomer - Google Patents
Environment-friendly foaming process and forming equipment for thermoplastic elastomer Download PDFInfo
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- CN111055421A CN111055421A CN201911412291.4A CN201911412291A CN111055421A CN 111055421 A CN111055421 A CN 111055421A CN 201911412291 A CN201911412291 A CN 201911412291A CN 111055421 A CN111055421 A CN 111055421A
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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
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
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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
- B29C44/3403—Foaming under special conditions, e.g. in sub-atmospheric pressure, in or on a liquid
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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
- B29C44/3415—Heating or cooling
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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
- B29C44/3442—Mixing, kneading or conveying the foamable material
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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
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/50—Footwear, e.g. shoes or parts thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention provides an environment-friendly foaming process and forming equipment of a thermoplastic elastomer, which comprises the following steps: heating thermoplastic elastomer particles to a temperature above the softening point; conveying the softened thermoplastic elastomer particles to a setting machine in a conveying mechanism under the condition of higher than atmospheric pressure, and in the conveying process, contacting the softened thermoplastic elastomer particles with at least one inert gas, and simultaneously heating the softened thermoplastic elastomer particles; the conveying mechanism guides the thermoplastic elastomer which is saturated with inert gas and in a molten state out of a mold of a forming machine, and a finished product is obtained after foaming and mold forming. According to the invention, the screw conveyor is adopted to convey and foam the thermoplastic elastomer particles, the screw conveyor rotates continuously, the thermoplastic elastomer particles can be stirred while being conveyed, so that the thermoplastic elastomer particles are heated uniformly and are fully contacted with gas, and the foaming efficiency is improved.
Description
Technical Field
The invention relates to the technical field of thermoplastic elastomer particle foaming, in particular to an environment-friendly foaming process and molding equipment for a thermoplastic elastomer.
Background
In the field of shoe materials, more damping materials such as TPU or PEBAX materials are used, in order to obtain a better foaming effect, the materials are generally required to be subjected to cross-linking treatment before foaming, the cross-linking mode is generally realized by adding a cross-linking agent or by irradiation cross-linking, but the defects caused by the cross-linking treatment are obvious, namely the cross-linked materials cannot be recycled, and the obtained product has poor environmental protection performance and does not meet the large direction of sustainable development in China at present.
The conventional ETPU shock-absorbing midsole is formed in two ways, one way is to adopt TPU material to perform injection molding to form a sole blank, then adopt a supercritical foaming way to fully foam the TPU material in a heating and pressurizing environment to obtain a foaming forming body, and the other way is to adopt a supercritical foaming way to foam TPU material particles in a heating and pressurizing environment to obtain ETPU particles, and then carry out secondary foaming to obtain the foaming forming body. However, in actual production, gas can enter the TPU material only after the TPU material is heated to be softened, so that heating and pressurizing the TPU material at the same time takes a long time, and the method is not suitable for actual production. In addition, the foamed molded body formed by the two molding modes still belongs to the category of semi-finished products, a shaping process of a shaping machine is needed between the foamed molded body and the finished damping insole, and in the molding and heating shaping process of the shaping machine, the TPU or PEBAX material which is not subjected to crosslinking operation can generate large shrinkage when meeting high temperature, so that the quality of the whole product is seriously influenced. Therefore, the existing forming mode has low efficiency and poor environment protection, and is not beneficial to the development of the shoe making industry.
Disclosure of Invention
The first purpose of the invention is to provide an environment-friendly foaming process for heating and softening thermoplastic elastomer particles, then continuously heating and pressurizing to improve the gas permeation speed, thereby greatly increasing the foaming efficiency, and realizing the recyclable thermoplastic elastomer finished products without crosslinking treatment aiming at the defects.
The first scheme adopted by the invention for solving the technical problem is as follows: an environment-friendly foaming process of thermoplastic elastomer comprises the following steps:
(1) heating thermoplastic elastomer particles to a temperature above the softening point;
(2) conveying the softened thermoplastic elastomer particles to a setting machine in a conveying mechanism under the condition of higher than atmospheric pressure, and in the conveying process, contacting the softened thermoplastic elastomer particles with at least one inert gas to drive the gas into the softened thermoplastic elastomer particles, and simultaneously heating the softened thermoplastic elastomer particles at a temperature higher than the melting temperature of the thermoplastic elastomer particles by 10-40 ℃;
(3) the conveying mechanism guides the thermoplastic elastomer which is saturated with inert gas and in a molten state out of the mold of the setting machine, the temperature is kept in the mold of the setting machine, the pressure is reduced, and a finished product is obtained after foaming and mold setting.
Further, in order to heat the thermoplastic elastomer particles to a temperature above the softening point for subsequent sufficient contact with an inert gas; in step (1), the thermoplastic elastomer particles are heated using a heating device.
Furthermore, in order to synchronously heat and pressurize the thermoplastic elastomer particles in the conveying process to enable the thermoplastic elastomer particles to be in a molten state, so that inert gas can fully enter the material, and the full foaming is ensured; in the step (2), a screw conveyor is used for conveying the softened thermoplastic elastomer particles, and a heat conduction flow channel is arranged on the inner wall of the screw conveyor to heat the softened thermoplastic elastomer particles.
Further, in order to avoid the reaction between the gas and the material, no trace is left after foaming; and (3) at least one inert gas in the step (2) is a supercritical fluid, and is nitrogen, carbon dioxide or a mixed gas of the nitrogen and the carbon dioxide.
Further, in order to maintain a pressure higher than atmospheric pressure, a gas is driven into the thermoplastic elastomer particles; in step (2), the pressure of the delivery mechanism is maintained between 5MPA and 30 MPA.
Further, in order to make the gas quickly overflow from the thermoplastic elastomer particles, bubbles are formed in the thermoplastic elastomer particles, and expansion foaming is realized; in the step (3), the pressure is reduced by exhausting, and the exhausting speed is 5-600 s.
Furthermore, in order to ensure that the material is environment-friendly and nontoxic, and has the characteristics of high elasticity, aging resistance and the like; the thermoplastic elastomer granular material is one of TPE, TPU, TPEE or PEBAX or a mixture of two or more than two materials.
The second purpose of the invention is to provide an environment-friendly foaming molding device which heats and softens the thermoplastic elastomer particles, heats and pressurizes the thermoplastic elastomer particles, improves the gas permeation speed, greatly accelerates the foaming efficiency and does not need cross-linking treatment to realize the recyclable thermoplastic elastomer as the finished product aiming at the defects.
The second scheme adopted by the invention for solving the technical problem is as follows: an environment-friendly foaming and forming device for thermoplastic elastomers comprises a heating device for heating thermoplastic elastomer particles to a temperature above a softening point, a heating and pressurizing conveying device for conveying the softened thermoplastic elastomer particles under a condition higher than atmospheric pressure and heating the thermoplastic elastomer particles into a molten state, a gas generating device for introducing at least one inert gas into the heating and pressurizing conveying device to drive the inert gas into the molten thermoplastic elastomer, and a forming device, wherein the heating and pressurizing conveying device is connected with the forming device to guide the thermoplastic elastomer saturated with the inert gas and in the molten state out of a mold of the forming device, and a finished product is obtained after foaming and mold forming.
Further, to transport materials between devices; and a lifter for conveying the softened thermoplastic elastomer particles into the conveying device is also arranged between the heating device and the heating and pressurizing conveying device.
Further, in order to heat the thermoplastic elastomer particles while being transported to a molten state and maintain the pressure of the transport environment above atmospheric pressure, the thermoplastic elastomer particles are contacted with at least one inert gas to drive the gas into the thermoplastic elastomer particles; the heating and pressurizing conveying device is a spiral conveyor, a feed hopper is arranged at the feed end of the spiral conveyor, the discharge end of the spiral conveyor is connected with the forming device, the spiral conveyor comprises a shell and a screw rod rotatably installed in the shell, a heat conduction pipe is arranged on the inner wall of the shell, and an air inlet used for introducing air into the shell so as to keep the internal pressure of the shell within 5-30 MPA is formed in the shell.
Compared with the prior art, the invention has the following advantages:
(1) the invention adopts the screw conveyer to convey thermoplastic elastomer particles, the thermoplastic elastomer particles are heated and pressurized synchronously in the conveying process, the sealing performance of the screw conveyer is optimized, a high-pressure environment can be provided, meanwhile, a heat conduction structure is arranged on a wall shell of the screw conveyer to heat the thermoplastic elastomer particles, so that the thermoplastic elastomer particles are in a molten state, when inert gas is continuously input into the screw conveyer to ensure that the molten thermoplastic elastomer is contacted with the inert gas, the screw conveyer continuously rotates to convey the thermoplastic elastomer particles, and simultaneously stir the thermoplastic elastomer particles to be uniformly heated, the thermoplastic elastomer particles are fully contacted with the inert gas, the gas permeability is improved, and further the foaming efficiency and the foaming quality are improved;
(2) the invention has higher foaming efficiency, the thermoplastic elastomer particles are foamed by heating and pressurizing usually, the heating softens the thermoplastic elastomer particles, the pressurizing makes inert gas enter the thermoplastic elastomer particles, the traditional foaming process is synchronously heated and pressurized, but in the initial stage, when the thermoplastic elastomer particles are not softened, the gas entering efficiency is very low, the invention adopts the steps of heating and softening the thermoplastic elastomer particles, then replacing a container for pressurizing and injecting gas, the containers on the two sides operate simultaneously, the efficiency is higher, in addition, the heating process is carried out in a reaction kettle, the volume expansion of the thermoplastic elastomer particles can not be caused by only heating the thermoplastic elastomer particles, the inert gas in the thermoplastic elastomer particle materials can be partially flushed out of the materials by the traditional heating and pressurizing process in the reaction kettle, so that the materials generate certain expansion, the reaction kettle has less reactant capacity, but most of gas is still kept in the material because the current temperature of the material is below the softening point (the kept gas can expand the material in the subsequent foaming process to play a role), so that more materials can be placed in the reaction kettle with the same volume, the utilization efficiency of the whole reaction kettle is improved, and the cost of a single material in the whole production process is reduced;
(3) the invention injects the melted thermoplastic elastomer particles filled with gas into the setting machine, directly foams in the die cavity of the die of the traditional setting machine, performs one-time foaming and setting, utilizes the heat conducting oil in the traditional setting machine to heat the die, directly utilizes the die to simultaneously complete foaming and setting when the foaming reaches the end program, not only saves the direct cost of the equipment required by foaming, but also realizes the reutilization of the traditional shoe material production equipment, namely the setting machine, thereby greatly reducing the production cost of enterprises, improving the market competitiveness of the enterprises, obtaining finished shoes only by conventionally adjusting the die of the current shoe material in the using process of the setting machine, reducing various labor costs in the process of foaming products to setting, and avoiding reheating the completely foamed material due to synchronous completion of foaming and setting, thereby causing the property problem of material shrinkage, and achieving multiple purposes;
(4) the thermoplastic elastomer particle materials are not subjected to crosslinking operation, so that the formed finished products are very convenient to recover, and meanwhile, the foaming and shaping processes are formed in the mould of the shaping machine at one time, so that the foamed products do not need to be heated and shaped again, and the problem of shrinkage caused by non-crosslinking is solved.
Drawings
The invention will be further illustrated with reference to the following examples with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of an environment-friendly foaming and molding device for thermoplastic elastomers;
fig. 2 is a schematic structural view of the heating and pressurizing conveying device.
In the figure: 1-a heating device; 2-a screw conveyor; 201-a feed hopper; 202-a housing; 203-screw rod; 204-heat conducting pipes; 205-an air inlet; 3-a forming device; 4-a hoisting machine; 5-gas generating device.
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples:
example 1: the embodiment provides an environment-friendly foaming process of a thermoplastic elastomer, which comprises the following steps:
(1) heating thermoplastic elastomer particles to a temperature above the softening point;
(2) conveying the softened thermoplastic elastomer particles to a setting machine in a conveying mechanism under the condition of higher than atmospheric pressure, and in the conveying process, contacting the softened thermoplastic elastomer particles with at least one inert gas to drive the gas into the softened thermoplastic elastomer particles, and simultaneously heating the softened thermoplastic elastomer particles at a temperature higher than the melting temperature of the thermoplastic elastomer particles by 10-40 ℃;
(3) the conveying mechanism guides the thermoplastic elastomer which is saturated with inert gas and in a molten state out of the mold of the setting machine, the temperature is kept in the mold of the setting machine, the pressure is reduced, and a finished product is obtained after foaming and mold setting.
In this embodiment, in order to heat the thermoplastic elastomer particles to a temperature above the softening point for subsequent sufficient contact with an inert gas; in step (1), the thermoplastic elastomer particles are heated using a heating device.
In the embodiment, in order to synchronously heat and pressurize the thermoplastic elastomer particles in the conveying process to enable the thermoplastic elastomer particles to be in a molten state, so that inert gas can fully enter the material, and the full progress of foaming is ensured; in the step (2), a screw conveyor is used for conveying the softened thermoplastic elastomer particles, and a heat conduction flow channel is arranged on the inner wall of the screw conveyor to heat the softened thermoplastic elastomer particles.
In the embodiment, in order to avoid the reaction between the gas and the material, no trace is left after foaming; and (3) at least one inert gas in the step (2) is a supercritical fluid, and is nitrogen, carbon dioxide or a mixed gas of the nitrogen and the carbon dioxide.
In this embodiment, in order to maintain a pressure above atmospheric pressure, a gas is driven into the thermoplastic elastomer particles; in step (2), the pressure of the delivery mechanism is maintained between 5MPA and 30 MPA.
In the present embodiment, in order to allow the gas to rapidly escape from the thermoplastic elastomer particles, bubbles are formed in the thermoplastic elastomer particles, and expansion foaming is achieved; in the step (3), the pressure is reduced by exhausting, and the exhausting speed is 5-600 s.
In the embodiment, in order to ensure that the material is environment-friendly and nontoxic, and has the characteristics of high elasticity, aging resistance and the like; the thermoplastic elastomer granular material is one of TPE, TPU, TPEE or PEBAX or a mixture of two or more than two materials.
Example 2: as shown in fig. 1-2, the embodiment provides an environment-friendly foaming and molding apparatus for thermoplastic elastomer, which includes a heating device 1 for heating thermoplastic elastomer particles to a temperature above a softening point, a heating and pressurizing conveying device for conveying the softened thermoplastic elastomer particles at a pressure higher than atmospheric pressure and heating the softened thermoplastic elastomer particles to a molten state, a gas generating device 5 for introducing at least one inert gas into the heating and pressurizing conveying device to drive the inert gas into the molten thermoplastic elastomer, and a molding device 3, wherein the heating and pressurizing conveying device is connected to the molding device 3 to guide the thermoplastic elastomer saturated with the inert gas and in the molten state out of a mold of the molding device 3, and a finished product is obtained after foaming and mold shaping. The heating temperature of the heating device 1 is above the softening point temperature of the thermoplastic elastomer particles, the heating temperature of the heating and pressurizing conveying device is 10-40 ℃ higher than the melting temperature of the thermoplastic elastomer particles, the pressure is 5-30 MPa, the inert gas is a supercritical fluid, and is nitrogen, carbon dioxide or a mixed gas of the nitrogen and the carbon dioxide
In this embodiment, to transport material between devices; a lifter 4 for conveying the softened thermoplastic elastomer particles into the conveying device is also arranged between the heating device 1 and the heating and pressurizing conveying device.
In this embodiment, in order to heat the thermoplastic elastomer particles while they are being transported, to bring them into a molten state, and to maintain the pressure of the transport environment above atmospheric pressure, the thermoplastic elastomer particles are contacted with at least one inert gas to drive the gas into the thermoplastic elastomer particles; the heating and pressurizing conveying device is a spiral conveyor 2, a feed hopper 201 is arranged at the feed end of the spiral conveyor 2, the discharge end of the spiral conveyor 2 is connected with the forming device 3, the spiral conveyor 2 comprises a shell 202 and a screw 203 rotatably installed in the shell 202, a heat conduction pipe 204 is arranged on the inner wall of the shell 202, and an air inlet 205 used for introducing air into the shell 202 to enable the inner pressure of the shell 202 to be kept at 5MPA-30MPA is arranged on the shell 202.
The invention injects the melted thermoplastic elastomer particles filled with gas into the setting machine, directly foams in the die cavity of the die of the traditional setting machine, performs one-time foaming and setting, utilizes the heat conducting oil in the traditional setting machine to heat the die, directly utilizes the die to simultaneously complete foaming and setting when the foaming reaches the end program, not only saves the direct cost of the equipment required by foaming, but also realizes the reutilization of the traditional shoe material production equipment, namely the setting machine, thereby greatly reducing the production cost of enterprises, improving the market competitiveness of the enterprises, obtaining finished shoes only by conventionally adjusting the die of the current shoe material in the using process of the setting machine, reducing various labor costs in the process of foaming products to setting, and avoiding reheating the completely foamed material due to synchronous completion of foaming and setting, thereby causing the property problem of material shrinkage, and achieving multiple purposes; the invention has higher foaming efficiency, the thermoplastic elastomer particles are foamed by heating and pressurizing usually, the thermoplastic elastomer particles are softened by heating, inert gas enters the thermoplastic elastomer particles by pressurizing, the traditional foaming process is synchronously heated and pressurized, but the efficiency of gas entering is very low when the thermoplastic elastomer particles are not softened at the initial stage, the invention heats and softens the thermoplastic elastomer particles firstly, and then replaces a container to pressurize and inject the gas, the efficiency is higher, in addition, the heating process is carried out in a reaction kettle, the volume expansion of the thermoplastic elastomer particles can not be caused by only heating the thermoplastic elastomer particles, compared with the traditional heating and pressurizing process in the reaction kettle, a part of the inert gas in the thermoplastic elastomer particles can be flushed out of the material, so that the material generates certain expansion, but because the current temperature of the material is below the softening point, most of gas still remains in the material (the remaining gas can expand the material in the secondary foaming process to play a role), so that more materials can be placed in the reaction kettle with the same volume, the utilization efficiency of the whole reaction kettle is improved, and the cost of a single material in the whole production process is reduced; the pressurization is completed in the process of conveying to the setting machine; the invention adopts the screw conveyer 2 to convey and foam the thermoplastic elastomer particles, optimizes the sealing performance of the screw conveyer 2 to provide a high-pressure environment, simultaneously, the wall shell of the screw conveyer 2 is provided with the heat conduction structure to heat the thermoplastic elastomer particles, so that the thermoplastic elastomer particles are in a molten state to be contacted with gas, the screw conveyer 2 continuously rotates to convey the thermoplastic elastomer particles and stir the thermoplastic elastomer particles to be uniformly heated, and the thermoplastic elastomer particles are fully contacted with the gas, thereby improving the foaming efficiency, the energy consumption in the whole foaming process is very little, the temperature of a reaction kettle does not need to be raised and lowered as the prior art, the energy consumption is reduced, the cost is reduced, and the production efficiency is also improved; the thermoplastic elastomer particle materials are not subjected to crosslinking operation, so that the formed finished products are very convenient to recover, and meanwhile, the foaming and shaping processes are formed in the mould of the shaping machine at one time, so that the foamed products do not need to be heated and shaped again, and the problem of shrinkage caused by non-crosslinking is solved.
The embodiments of the present invention are not limited to the scope of the invention, and all equivalent structures or equivalent flow transformations which are made by the contents of the specification and the drawings of the present invention, or which are directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An environment-friendly foaming process of thermoplastic elastomer is characterized in that: the method comprises the following steps:
(1) heating thermoplastic elastomer particles to a temperature above the softening point;
(2) conveying the softened thermoplastic elastomer particles to a setting machine in a conveying mechanism under the condition of higher than atmospheric pressure, and in the conveying process, contacting the softened thermoplastic elastomer particles with at least one inert gas to drive the gas into the softened thermoplastic elastomer particles, and simultaneously heating the softened thermoplastic elastomer particles at a temperature higher than the melting temperature of the thermoplastic elastomer particles by 10-40 ℃;
(3) the conveying mechanism guides the thermoplastic elastomer which is saturated with inert gas and in a molten state out of the mold of the setting machine, the temperature is kept in the mold of the setting machine, the pressure is reduced, and a finished product is obtained after foaming and mold setting.
2. The environmentally friendly foaming process of thermoplastic elastomers according to claim 1, characterized in that: in step (1), the thermoplastic elastomer particles are heated using a heating device.
3. The environmentally friendly foaming process of thermoplastic elastomers according to claim 1, characterized in that: in the step (2), a screw conveyor is used for conveying the softened thermoplastic elastomer particles, and a heat conduction flow channel is arranged on the inner wall of the screw conveyor to heat the softened thermoplastic elastomer particles.
4. The environmentally friendly foaming process of thermoplastic elastomers according to claim 1, characterized in that: and (3) at least one inert gas in the step (2) is a supercritical fluid, and is nitrogen, carbon dioxide or a mixed gas of the nitrogen and the carbon dioxide.
5. The environmentally friendly foaming process of thermoplastic elastomers according to claim 1, characterized in that: in step (2), the pressure of the delivery mechanism is maintained between 5MPA and 30 MPA.
6. The environmentally friendly foaming process of thermoplastic elastomers according to claim 1, characterized in that: in the step (3), the pressure is reduced by exhausting, and the exhausting speed is 5-600 s.
7. The environmentally friendly foaming process of thermoplastic elastomers according to claim 1, characterized in that: the thermoplastic elastomer granular material is one of TPE, TPU, TPEE or PEBAX or a mixture of two or more than two materials.
8. The utility model provides a thermoplastic elastomer's environmental protection foam molding equipment which characterized in that: the device comprises a heating device for heating thermoplastic elastomer particles to a temperature above a softening point, a heating and pressurizing conveying device for conveying the softened thermoplastic elastomer particles under a condition higher than atmospheric pressure and heating the softened thermoplastic elastomer particles into a molten state, a gas generating device for introducing at least one inert gas into the heating and pressurizing conveying device to drive the inert gas into the molten thermoplastic elastomer, and a forming device, wherein the heating and pressurizing conveying device is connected with the forming device to guide the thermoplastic elastomer saturated with the inert gas and in the molten state out of a mold of the forming device, and a finished product is obtained after foaming and mold shaping.
9. The environmentally friendly foam molding apparatus for thermoplastic elastomer according to claim 8, wherein: and a lifter for conveying the softened thermoplastic elastomer particles into the conveying device is also arranged between the heating device and the heating and pressurizing conveying device.
10. The environmentally friendly foam molding apparatus for thermoplastic elastomer according to claim 8, wherein: the heating and pressurizing conveying device is a spiral conveyor, a feed hopper is arranged at the feed end of the spiral conveyor, the discharge end of the spiral conveyor is connected with the forming device, the spiral conveyor comprises a shell and a screw rod rotatably installed in the shell, a heat conduction pipe is arranged on the inner wall of the shell, and an air inlet used for introducing air into the shell so as to keep the internal pressure of the shell within 5-30 MPA is formed in the shell.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911412291.4A CN111055421A (en) | 2019-12-31 | 2019-12-31 | Environment-friendly foaming process and forming equipment for thermoplastic elastomer |
| PCT/CN2020/078157 WO2021134908A1 (en) | 2019-12-31 | 2020-04-02 | Environment-friendly foaming process and molding device for thermoplastic elastomer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911412291.4A CN111055421A (en) | 2019-12-31 | 2019-12-31 | Environment-friendly foaming process and forming equipment for thermoplastic elastomer |
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| CN111055421A true CN111055421A (en) | 2020-04-24 |
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| CN201911412291.4A Pending CN111055421A (en) | 2019-12-31 | 2019-12-31 | Environment-friendly foaming process and forming equipment for thermoplastic elastomer |
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| WO (1) | WO2021134908A1 (en) |
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| CN101028739B (en) * | 2006-02-27 | 2010-05-12 | 北京中拓机械有限责任公司 | Air-auxiliary injection forming process of thermoplastic resin product |
| CN103350510B (en) * | 2013-07-04 | 2015-07-22 | 浙江海虹控股集团有限公司 | Equipment and method for preparing polymer supercritical foaming material |
| GB201409248D0 (en) * | 2014-05-23 | 2014-07-09 | Zotefoams Plc | Method for producing three dimensional foam articles |
| CN109016320A (en) * | 2018-09-08 | 2018-12-18 | 广东奔迪新材料科技有限公司 | A kind of thermoplastic polymer particles mould inner mold foaming and forming apparatus and its forming method |
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