CN117382078B - Supercritical mixed gas injection foaming forming process and equipment - Google Patents
Supercritical mixed gas injection foaming forming process and equipment Download PDFInfo
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- CN117382078B CN117382078B CN202311330621.1A CN202311330621A CN117382078B CN 117382078 B CN117382078 B CN 117382078B CN 202311330621 A CN202311330621 A CN 202311330621A CN 117382078 B CN117382078 B CN 117382078B
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- foaming
- injection
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- 238000005187 foaming Methods 0.000 title claims abstract description 38
- 238000002347 injection Methods 0.000 title claims abstract description 37
- 239000007924 injection Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008569 process Effects 0.000 title claims abstract description 18
- 230000000694 effects Effects 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- 238000000465 moulding Methods 0.000 claims abstract description 10
- 238000004073 vulcanization Methods 0.000 claims abstract description 8
- 238000001746 injection moulding Methods 0.000 claims abstract description 5
- 239000011521 glass Substances 0.000 claims description 23
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 239000004065 semiconductor Substances 0.000 claims description 21
- 238000009413 insulation Methods 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 9
- 229910001018 Cast iron Inorganic materials 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000000084 colloidal system Substances 0.000 claims description 6
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 229920000428 triblock copolymer Polymers 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 239000012782 phase change material Substances 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 239000004604 Blowing Agent Substances 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 claims description 2
- 239000006260 foam Substances 0.000 abstract 1
- 239000012945 sealing adhesive Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- B29C44/04—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
-
- 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
- B29C44/04—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
- B29C44/0407—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by regulating the temperature of the mould or parts thereof, e.g. cold mould walls inhibiting foaming of an outer layer
-
- 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
- B29C44/04—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
- B29C44/0415—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities by regulating the pressure of the material during or after filling of the mould, e.g. by local venting
-
- 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
- B29C44/04—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 consisting of at least two parts of chemically or physically different materials, e.g. having different densities
- B29C44/0492—Devices for feeding the different materials
-
- 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
-
- 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
-
- 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
- B29C44/3488—Vulcanizing the material before foaming
-
- 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
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
-
- 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
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
- B29C44/428—Mould constructions; Mould supporting equipment
-
- 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
- B29C44/58—Moulds
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2353/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Molding Of Porous Articles (AREA)
Abstract
The invention discloses a supercritical mixed gas injection foaming molding process and equipment, which relate to the field of foaming injection molding, and comprise a fixed frame; an extruder for injection is mounted on the bolt at the right top side of the fixed frame; the blending component is welded and fixed at the top material port of the extruder, the die component is used for carrying out exhaust pressure control for multiple times, and a proper amount of BIPB cross-linking agent is added, so that the net structure effect generated between molecular chains of the material can strengthen and improve the tensile strength and elongation at break of the foam, the foaming temperature and the vulcanization time can be properly improved, the number of cells can be increased, and the uniformity of the cells can be promoted, so that the mechanical property of the product can be effectively improved.
Description
Technical Field
The invention relates to the field of foaming injection molding, in particular to a supercritical mixed gas injection foaming molding process and equipment.
Background
Supercritical gas refers to gas exceeding the critical temperature, critical pressure and critical volume state of the gas-liquid of a substance; in a narrow sense, refers to a gas or fluid that exceeds a critical temperature state; foaming injection is a high-end energy-saving molding technology with great development prospect, and the process breaks through the limitations of traditional injection molding, can obviously lighten the weight of a finished piece, shortens the molding period and greatly improves the buckling deformation and the dimensional stability of the finished piece.
The foaming materials produced by the existing preparation process have the problems of large deformation, poor wear resistance, non-skid property, low-temperature hardening and the like, so that the wide application of the foaming materials is greatly limited; the flow guide assembly of the existing preparation equipment has the problems that the exhaust time length is difficult to accurately control due to higher precision, the temperature of the preparation equipment has gradient distribution phenomenon, the upper part and the lower part of the foaming body are easily affected to be different due to different temperatures, and the equipment is complex to reform, the investment cost is high, the process control is difficult and the like.
Disclosure of Invention
Therefore, in order to solve the above-mentioned shortcomings, the present invention provides a process and apparatus for injection foaming of supercritical mixed gas.
The invention is realized in such a way that a supercritical mixed gas injection foaming molding process and equipment are constructed, and the device comprises a fixed frame; an extruder for injection is mounted on the bolt at the right top side of the fixed frame; a blending component is welded and fixed at a top material port of the extruder; a die assembly is arranged at the left end injection port of the extruder; an adjusting piece which has a driving function on the die assembly is arranged on the left end frame body bolt of the fixed frame;
the die assembly comprises an adjusting frame which is arranged on the bottom rod frame body at the left end of the fixed frame in a sliding manner; the right end bolt of the adjusting frame is provided with a clamping plate; a movable die assembly is mounted on the middle side bolt at the right end of the clamping plate; a fixed die is arranged at the left end bolt of the side vertical rod in the fixed frame; the left side of the movable die assembly is provided with a pressure regulating piece for precisely controlling exhaust; quick connectors are arranged at the holes and grooves on the upper side and the lower side of the rear end of the movable die assembly in a pipeline manner; the quick connector is connected with the injection piece at the bottom side of the injection piece in a pipe way, wherein two groups of pressure regulating pieces are arranged at the left side of the movable die assembly, and the quick connector is respectively connected with an external air inlet pipe and an air box pipe way.
Preferably, the movable die assembly comprises a combined die fixedly arranged at the right end of the clamping plate; sealing rubber strips with sealing effect are arranged at the upper and lower connecting parts and the right end face of the combined die; the left end of the combined die is provided with a modularized temperature control part for temperature monitoring; the inner side wall of the combined die is fixedly provided with a high-heat-conductivity metal frame.
Preferably, a heat conducting glass is embedded and fixed at the groove on the inner side of the combined die, a thermocouple electrically connected with the electric control switch is arranged in the heat conducting glass, and a phase change material with high heat conductivity is arranged in the heat conducting glass; the bottom bolt of the combined die is provided with a multi-section temperature detector for temperature detection; the left side of the heat conducting glass is rotatably provided with a high heat conducting colloid; the high heat conduction colloid is fixedly arranged at the left side and the right side of the heat insulation plate.
Preferably, semiconductor refrigerating sheets with temperature control function are arranged and fixed at the through groove in the heat insulation plate; the rear end of the heat insulation plate is fixedly inserted into the center hole of the magnetic control part through a connecting rod; and an electric control switch is arranged at the rear end bolt of the combined die.
Preferably, the pressure regulating part comprises an air pressure detector which is mounted on the front side of the top of the combined die through bolts; a time delay electric control valve is arranged at the pipeline at the left end through hole of the combined die; the delay electric control valve pipeline is arranged at the left side and the right side of the cone-mouth pipe.
Preferably, the middle side of the inside of the cone pipe is rotatably provided with a light fan; the light fan top shaft body is inserted into the timing switch at the bottom of the timer.
Preferably, the adjusting piece is specifically composed of a motor, a transmission belt wheel arranged in a transmission manner with the motor and a screw rod inserted and fixed on the right side of the transmission belt wheel, and the screw rod is in threaded transmission with screw hole lug plates on the front side and the rear side of the clamping plate respectively.
Preferably, an air box is mounted on the right side bolt of the adjusting frame, and a slotted hole at the top of the air box is mounted on an air outlet pipeline of the delay electric control valve at the left end of the conical mouth pipe through a connecting pipe.
Preferably, the heat insulation plate and the magnetic control bolt are arranged at the groove at the right end of the clamping plate, the magnetic control is specifically composed of an installation shell, a key slot cast iron ring and an electromagnetic coil, and the key slot cast iron ring is fixedly inserted into the shaft body at the rear end of the heat insulation plate.
Preferably, the process for injecting, foaming and forming the supercritical mixed gas is characterized in that: the method comprises the following steps:
step one: proportioning in equal proportion; the staff weighed the linear triblock copolymer, ethylene-vinyl acetate copolymer, blowing agent, vulcanizing agent and crosslinking agent as raw materials for preparation in the same ratio, specifically 98:70:1:1:1, a step of;
step two: vacuum drying and melt blending; introducing the linear triblock copolymer and the ethylene-vinyl acetate copolymer material into a blending assembly for vacuum drying, and carrying out melt blending in the blending assembly;
step three: extrusion injection molding; injecting the cross-linking agent into the die assembly through the extruder, adding the cross-linking agent into the die assembly through the injection part, and controlling a group of adjusting parts (45) to adjust the internal pressure of the die assembly (4) to a proper height, wherein the other group of adjusting parts are used for controlling the internal airflow of the die assembly to be discharged;
step four: vulcanizing; when the extruder ejects the melted mixture into the movable mold assembly and the fixed mold, the thermocouple arranged in the heat conducting glass is utilized to rapidly heat the inside of the movable mold assembly and the fixed mold to 170-180 ℃ under the auxiliary action of the semiconductor refrigerating sheet, and the heating end of the semiconductor refrigerating sheet faces to one side of the heat conducting glass; then the delay electric control valves on the front side and the rear side of the control cone pipe are synchronously opened, at the moment, the movable mould component and the fixed mould flow out to push the light fan to control the timer to time, and the delay electric control valves are closed by two seconds under the auxiliary effect of the timer; repeating the steps for three times, wherein the interval time of single exhaust is ten seconds; then stabilizing the internal pressure of the movable die assembly and the fixed die for one minute, and repeating the exhausting step again, wherein the delay control time of the delay electric control valve in the secondary exhausting step is five seconds; then adding a cross-linking agent into the die assembly by using an injection piece, wherein the cross-linking agent is specifically 5% BIPB, and performing pressure-maintaining vulcanization, and the vulcanization time is specifically 6 minutes;
step five: foaming the mixed gas; then, the supercritical mixed gas is injected into the movable mold component and the fixed mold by using a pressure regulating part which plays a role in gas injection at the left side of the top of the combined mold, the pressure of the mixed gas is controlled to be 16/MPa, and at the moment, the heat insulation plate and the semiconductor refrigerating sheet are driven to rotate by controlling the magnetic control part, so that the refrigerating end face of the semiconductor refrigerating sheet is led to heat-conducting glass, the internal temperature of the movable mold component and the fixed mold is quickly regulated to 110-130 ℃ by using the refrigerating effect of the semiconductor refrigerating sheet, the foaming temperature and the air pressure are kept for 40 minutes, and then the foaming product is decompressed and taken out.
The invention has the following advantages: the invention provides a supercritical mixed gas injection foaming molding process and equipment by improving the process, which are improved as follows compared with the same type of equipment:
according to the supercritical mixed gas injection foaming molding process and equipment, the mold assembly is used for carrying out exhaust pressure control for multiple times and adding a proper amount of BIPB crosslinking agent, so that the net structure effect generated among material molecular chains can be enhanced, the tensile strength and the elongation at break of the foaming body can be enhanced, the foaming temperature and the vulcanization time can be properly increased, the number of cells can be increased, and the uniformity of the cells can be promoted, so that the mechanical property of a product can be effectively improved.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic perspective view of the stationary frame and extruder and die assembly of the present invention;
FIG. 3 is a schematic rear view of the mold assembly of the present invention;
FIG. 4 is a schematic rear exploded view of the pressure regulating member of the present invention;
FIG. 5 is a schematic view of a rear-view exploded view of the movable mold assembly of the present invention;
FIG. 6 is a schematic diagram of a three-dimensional exploded view of a modular temperature control member of the present invention;
fig. 7 is an enlarged schematic view of the structure of fig. 6 a according to the present invention.
Wherein: the device comprises a fixed frame-1, an extruder-2, a blending component-3, a die component-4, an adjusting part-5, an adjusting frame-41, a clamping plate-42, a movable die component-43, a fixed die-44, an adjusting part-45, a quick connector-46, an injection part-47, a combined die-431, a sealing adhesive tape-432, a modularized temperature control part-433, a high heat conduction metal frame-434, heat conduction glass-4331, a multi-stage temperature detector-4332, a high heat conduction colloid-4333, a heat insulation plate-4334, a semiconductor refrigerating sheet-4335, a magnetic control part-4336, an electric control switch-4337, an air pressure detector-451, a time delay electric control valve-452, a cone pipe-453, a light fan-454 and a timer-455.
Detailed Description
The principles and features of the present invention are described below with reference to fig. 1-7, the examples being provided for illustration only and not for limitation of the scope of the invention. The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "configured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Hereinafter, an embodiment of the present invention will be described in accordance with its entire structure.
Embodiment one:
referring to fig. 1 to 7, the present invention relates to a process and an apparatus for injection foaming of supercritical mixed gas, comprising a fixed frame 1; the extruder 2 for injection is arranged on the bolt at the right top side of the fixed frame 1; a blending component 3 is welded and fixed at a material port at the top of the extruder 2; a die assembly 4 is arranged at the injection port at the left end of the extruder 2; an adjusting piece 5 which has a driving function on the die assembly 4 is arranged on the left end frame body bolt of the fixed frame 1;
the die assembly 4 comprises an adjusting frame 41 which is arranged on the bottom rod frame body at the left end of the fixed frame 1 in a sliding manner; the right end bolt of the adjusting frame 41 is provided with a clamping plate 42, and screw hole lug plates are arranged on the front side and the rear side of the clamping plate 42; a movable die assembly 43 is mounted on the middle side bolt at the right end of the clamping plate 42; the left end bolt of the side vertical rod in the fixed frame 1 is provided with a fixed die 44; the left side of the movable mould assembly 43 is provided with a pressure regulating piece 45 for precisely controlling exhaust, the left side of the movable mould assembly 43 is provided with two groups of pressure regulating pieces 45, the two groups of pressure regulating pieces 45 are respectively installed with an external air inlet pipe and an air box pipeline, and the two groups of pressure regulating pieces 45 are used for respectively executing the exhaust and air inlet processes; quick connectors 46 are arranged at the upper side hole slots and the lower side hole slots of the rear end of the movable mould assembly 43 in a pipeline manner; the quick connectors 46 are connected with the bottom side of the injection piece 47 through pipelines, and the two groups of quick connectors 46 respectively provide an adjusting effect for the injection environment of the injection piece 47; the adjusting piece 5 specifically comprises a motor, a transmission belt wheel arranged in transmission with the motor and a screw rod inserted and fixed on the right side of the transmission belt wheel, the screw rod is respectively in threaded transmission with screw hole lug plates on the front side and the rear side of the clamping plate 42, and the adjusting piece 5 provides a displacement driving effect for the clamping plate 42.
The movable mold assembly 43 includes a combined mold 431 fixedly installed at the right end of the clamping plate 42; sealing adhesive tapes 432 with sealing effect are arranged at the upper and lower connecting parts and the right end face of the combined die 431, and the sealing adhesive tapes 432 are utilized to provide sealing effect for the whole movable die assembly 43; the left end of the combined mold 431 is provided with a modularized temperature control part 433 for temperature monitoring; the inner side wall of the combined mold 431 is fixedly provided with a high heat conduction metal frame 434, and a rapid temperature control effect is provided for a foaming environment by utilizing the high heat conduction effect of the high heat conduction metal frame 434.
The heat conducting glass 4331 is embedded and fixed at the groove on the inner side of the combined die 431, a thermocouple electrically connected with the electric control switch 4337 is arranged in the heat conducting glass 4331, and a phase change material with high heat conductivity is arranged in the heat conducting glass 4331, so that the rapid heat conducting effect on the heat conducting glass 4331 and the high heat conducting metal frame 434 is improved by utilizing the thermocouple and the phase change material; the bottom bolt of the combined mold 431 is provided with a multi-section temperature detector 4332 for temperature detection, and the multi-section temperature detector 4332 is used for providing temperature monitoring effects for the interiors of three groups of heat conducting glass 4331 at the top of the combined mold; the left side of the heat conducting glass 4331 is rotatably provided with a high heat conducting colloid 4333; the high heat-conducting colloid 4333 is fixedly arranged at the left side and the right side of the heat insulation plate 4334; the semiconductor refrigeration pieces 4335 with the temperature control function are arranged and fixed at the through grooves in the heat insulation plate 4334, and the temperature control effect of the auxiliary foaming of the semiconductor refrigeration pieces 4335 is utilized; the rear end of the heat insulation plate 4334 is fixed at the center hole of the magnetic control 4336 through the connecting rod in a plugging manner; an electric control switch 4337 is arranged at the rear end bolt of the combined die 431.
The heat insulation plate 4334 and the magnetic control 4336 are mounted at the right end groove of the clamping plate 42 through bolts, the magnetic control 4336 is specifically composed of a mounting shell, a key slot cast iron ring and an electromagnetic coil, the key slot cast iron ring is fixedly inserted into the rear end shaft body of the heat insulation plate 4334, and the electromagnetic coil in the magnetic control 4336 is used for driving the key slot cast iron to rotate 180 degrees so as to change the angle of the semiconductor refrigeration piece 4335.
The working principle of the supercritical mixed gas injection foaming molding process and the device based on the first embodiment is as follows:
firstly, when the equipment is used, the equipment is firstly placed in a working area, and then the device is connected with an external power supply, so that a power supply required by the work of the equipment can be provided;
secondly, staff weigh the linear triblock copolymer, ethylene-vinyl acetate copolymer, foaming agent, vulcanizing agent and crosslinking agent as preparation raw materials in the following proportion, wherein the proportion is specifically 98:70:1:1:1, a step of; introducing the linear triblock copolymer and the ethylene-vinyl acetate copolymer material into the blending component 3 for vacuum drying, and carrying out melt blending in the blending component 3;
thirdly, when the extruder 2 injects the melted mixture into the movable mold assembly 43 and the fixed mold 44, the thermocouple arranged in the heat-conducting glass 4331 is utilized to rapidly heat the inside of the movable mold assembly 43 and the fixed mold 44 to 170-180 ℃ under the auxiliary action of the semiconductor refrigerating piece 4335, the heating end of the semiconductor refrigerating piece 4335 faces the heat-conducting glass 4331, two groups of air exhausting steps are performed through the pressure regulating piece 45, and the pressure maintaining process is performed for one minute when an air exhausting gap exists; then, a cross-linking agent, specifically 5% BIPB, is added into the interior of the mold assembly 4 by means of an injection member 47, and pressure-maintaining vulcanization is performed, specifically 6 minutes;
fourth, then, the supercritical mixed gas is injected into the movable mold assembly 43 and the fixed mold 44 by using the pressure regulating part 45 which plays a role in gas injection at the left side of the top of the combined mold 431, the pressure of the mixed gas is controlled to be 16/MPa, at the moment, the temperature-insulating plate 4334 and the semiconductor refrigerating plate 4335 are driven to rotate by controlling the magnetic control 4336, so that the refrigerating end of the semiconductor refrigerating plate 4335 faces the heat-conducting glass 4331, the temperature in the movable mold assembly 43 and the fixed mold 44 is quickly regulated to 110-130 ℃ by using the refrigerating effect of the semiconductor refrigerating plate 4335, the foaming temperature and the air pressure are kept for 40 minutes, and then, the pressure is relieved, and a foaming product is taken out.
Embodiment two:
referring to fig. 1 to 7, in the present invention, compared with the first embodiment, the process and apparatus for injection foaming of supercritical mixed gas further includes: a regulator 45; the pressure regulating part 45 comprises an air pressure detector 451 which is mounted on the front side of the top of the combined mold 431 by bolts, and air pressure monitoring is provided for the inside of the combined mold 431 by using the air pressure detector 451; a time delay electric control valve 452 is arranged at the left end through hole of the combined die 431 in a pipeline manner; the delay electric control valve 452 is arranged on the left side and the right side of the cone 453; a light fan 454 is rotatably arranged on the middle side of the inner part of the cone 453; the top shaft body of the light fan 454 is inserted into the timing switch at the bottom of the timer 455, and the timer 455 is driven to time by the rotation angle of the light fan 454 so as to improve the timing precision; the right side bolt of the adjusting frame 41 is provided with an air box, a slotted hole at the top of the air box is arranged on an air outlet pipeline of a delay electric control valve 452 at the left end of a conical mouth pipe 453 through a connecting pipe, the conical mouth pipe 453 and the delay electric control valve 452 arranged at the position are a group of pressure regulating pieces 45 with an exhaust function, and two groups of pressure regulating pieces 45 are arranged on the left side of the movable die assembly 43 and are respectively arranged on an external air inlet pipe and an air box pipeline.
In this embodiment:
when the pressure regulating part 45 executes two sets of exhaust steps, the delay electric control valves 452 on the front side and the rear side of the control cone 453 are synchronously opened, and the movable module 43 and the fixed die 44 flow out to push the light fan 454 to control the timer 455 to time, and the delay electric control valves 452 are closed by two seconds under the auxiliary effect of the timer 455; repeating the steps for three times, wherein the interval time of single exhaust is ten seconds; then the internal pressure of the movable die assembly 43 and the fixed die 44 is stabilized for one minute, and the above-described exhausting step is repeated again, wherein the delay control time of the delay electric control valve 452 in the secondary exhausting step is five seconds.
The invention provides a supercritical mixed gas injection foaming molding process and equipment, which can strengthen and improve the tensile strength and elongation at break of a foaming body through the net structure effect generated between molecular chains of a material by carrying out exhaust pressure control for multiple times and adding a proper amount of BIPB cross-linking agent through a die assembly 4, and can increase the number of cells and promote the uniformity of the cells to effectively improve the mechanical property of a product by properly improving the foaming temperature and vulcanization time.
The basic principle and main characteristics of the invention and the advantages of the invention are shown and described above, standard parts used by the invention can be purchased from market, special-shaped parts can be customized according to the description of the specification and the drawings, the specific connection modes of the parts adopt conventional means such as mature bolt rivets and welding in the prior art, the machinery, the parts and the equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection modes in the prior art, so that the description is omitted.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A supercritical mixed gas injection foaming molding device is characterized in that: comprises a fixed frame (1); an extruder (2) for injection is mounted on the right top side bolt of the fixed frame (1); a blending component (3) is welded and fixed at a top material opening of the extruder (2); a die assembly (4) is arranged at the injection port at the left end of the extruder (2); an adjusting piece (5) which has a driving function on the die assembly (4) is arranged on the left end frame body bolt of the fixed frame (1);
the die assembly (4) comprises an adjusting frame (41) which is arranged on the bottom rod frame body at the left end of the fixed frame (1) in a sliding manner; a clamping plate (42) is arranged at the right end of the adjusting frame (41) through bolts; a movable die assembly (43) is mounted on the middle side bolt at the right end of the clamping plate (42); a fixed die (44) is arranged at the left end bolt of the side vertical rod in the fixed frame (1); a pressure regulating part (45) for precisely controlling exhaust is arranged on the left side of the movable die assembly (43); quick connectors (46) are arranged at the holes and grooves on the upper side and the lower side of the rear end of the movable mould assembly (43) in a pipeline manner; the quick connector (46) is connected with the bottom side of the injection piece (47) through a pipeline; wherein, the left side of the movable mould component (43) is provided with two groups of pressure regulating parts (45) and is respectively installed with an external air inlet pipe and an air box pipeline;
the movable die assembly (43) comprises a combined die (431) fixedly installed at the right end of the clamping plate (42); sealing rubber strips (432) with sealing effect are arranged at the upper and lower connecting parts and the right end face of the combined die (431); the left end of the combined die (431) is provided with a modularized temperature control part (433) for temperature monitoring; the inner side wall of the combined die (431) is fixedly provided with a high heat conduction metal frame (434);
a heat conducting glass (4331) is embedded and fixed at the groove on the inner side of the combined die (431), a thermocouple electrically connected with the electric control switch (4337) is arranged inside the heat conducting glass (4331), and a phase change material with high heat conductivity is arranged inside the heat conducting glass (4331); a multi-section temperature detector (4332) for temperature detection is arranged at the bottom bolt of the combined die (431); the left side of the heat conducting glass (4331) is rotatably provided with a high heat conducting colloid (4333); the high heat conduction colloid (4333) is fixedly arranged at the left side and the right side of the heat insulation plate (4334);
a semiconductor refrigeration sheet (4335) with a temperature control effect is fixedly arranged at the through groove in the heat insulation plate (4334); the rear end of the heat insulation plate (4334) is fixedly inserted into a circle center hole of the magnetic control part (4336) through a connecting rod; an electric control switch (4337) is arranged at the rear end bolt of the combined die (431);
the pressure regulating piece (45) comprises an air pressure detector (451) which is mounted on the front side of the top of the combined die (431) through bolts; a time delay electric control valve (452) is arranged at the pipeline at the left end through hole of the combined die (431); the delay electric control valve (452) is arranged on the left side and the right side of the cone pipe (453) in a pipeline manner;
a light fan (454) is rotatably arranged on the middle side of the inner part of the cone-mouth pipe (453); the top shaft body of the light fan (454) is inserted into a timing switch at the bottom of the timer (455);
the adjusting piece (5) is particularly composed of a motor, a transmission belt wheel arranged in a transmission way with the motor and a screw rod inserted and fixed on the right side of the transmission belt wheel, and the screw rod is respectively in threaded transmission with screw hole lug plates on the front side and the rear side of the clamping plate (42);
an air box is mounted on the right side of the adjusting frame (41) through bolts, and a slotted hole at the top of the air box is mounted on an air outlet pipeline of a delay electric control valve (452) at the left end of a conical mouth pipe (453) through a connecting pipe;
the heat insulation plate (4334) and the magnetic control (4336) are mounted at the groove at the right end of the clamping plate (42) through bolts, the magnetic control (4336) is specifically composed of a mounting shell, a key slot cast iron ring and an electromagnetic coil, and the key slot cast iron ring is fixedly connected with the rear end shaft body of the heat insulation plate (4334) in an inserting mode.
2. A process for the injection foaming of a supercritical gas mixture, for implementing the injection foaming apparatus of claim 1, characterized in that: the method comprises the following steps:
step one: proportioning in equal proportion; the staff weighed the linear triblock copolymer, ethylene-vinyl acetate copolymer, blowing agent, vulcanizing agent and crosslinking agent as raw materials for preparation in the same ratio, specifically 98:70:1:1:1, a step of;
step two: vacuum drying and melt blending; introducing the linear triblock copolymer and the ethylene-vinyl acetate copolymer material into the blending component (3) for vacuum drying, and carrying out melt blending in the blending component (3);
step three: extrusion injection molding; injecting the cross-linking agent into the die assembly (4) through the extruder (2), adding the cross-linking agent into the die assembly (4) through the injection piece (47), and controlling a group of adjusting pieces (45) to adjust the internal pressure of the die assembly (4) to a proper height, wherein the air flow in the die assembly (4) is controlled to be discharged through another group of adjusting pieces (45);
step four: vulcanizing; when the extruder (2) shoots out the melted mixture into the movable die assembly (43) and the fixed die (44), the thermocouple arranged in the heat conducting glass (4331) is utilized to rapidly heat the inside of the movable die assembly (43) and the fixed die (44) to 170-180 ℃ under the auxiliary effect of the semiconductor refrigerating sheet (4335), and the heating end of the semiconductor refrigerating sheet (4335) faces one surface of the heat conducting glass (4331); then the delay electric control valves (452) on the front side and the rear side of the control cone (453) are synchronously opened, at the moment, the movable module (43) and the fixed die (44) flow out to push the light fan (454) to control the timer (455) to time, and the delay electric control valves (452) are closed by two seconds under the auxiliary effect of the timer (455); repeating the steps for three times, wherein the interval time of single exhaust is ten seconds; then stabilizing the internal pressure of the movable die assembly (43) and the fixed die (44) for one minute, repeating the exhausting step again, wherein the delay control time of the delay electric control valve (452) in the repeated exhausting step is five seconds; then adding a cross-linking agent into the die assembly (4) by using an injection piece (47), wherein the cross-linking agent is specifically 5% BIPB, and performing pressure-maintaining vulcanization, and the vulcanization time is specifically 6 minutes;
step five: foaming the mixed gas; then, a pressure regulating part (45) which plays a role in injecting air is utilized to inject supercritical mixed gas into the movable die assembly (43) and the fixed die (44) at the left side of the top of the combined die (431), the pressure of the mixed gas is controlled to be 16/MPa, at the moment, a heat insulation plate (4334) and a semiconductor refrigerating sheet (4335) are driven to rotate by controlling a magnetic control part (4336), so that the refrigerating end face of the semiconductor refrigerating sheet (4335) faces towards the heat conducting glass (4331), the internal temperature of the movable die assembly (43) and the internal temperature of the fixed die (44) are quickly regulated to 110-130 ℃ by utilizing the refrigerating effect of the semiconductor refrigerating sheet (4335), foaming is carried out for 40 minutes while the foaming temperature and the air pressure are kept, and then, the foaming product is decompressed and taken out.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1170662A (en) * | 1996-04-04 | 1998-01-21 | 三井东压化学株式会社 | Injection-expansion molded, thermoplastic resin product and production process thereof |
| CN116690885A (en) * | 2023-05-26 | 2023-09-05 | 东莞海瑞斯新材料科技有限公司 | Supercritical in-mold foaming molding equipment with pretreatment and foaming method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1170662A (en) * | 1996-04-04 | 1998-01-21 | 三井东压化学株式会社 | Injection-expansion molded, thermoplastic resin product and production process thereof |
| CN116690885A (en) * | 2023-05-26 | 2023-09-05 | 东莞海瑞斯新材料科技有限公司 | Supercritical in-mold foaming molding equipment with pretreatment and foaming method thereof |
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