CN111389690A - Thermoplastic composite film and production process thereof - Google Patents
Thermoplastic composite film and production process thereof Download PDFInfo
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- CN111389690A CN111389690A CN202010231406.6A CN202010231406A CN111389690A CN 111389690 A CN111389690 A CN 111389690A CN 202010231406 A CN202010231406 A CN 202010231406A CN 111389690 A CN111389690 A CN 111389690A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
- B05D7/04—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber to surfaces of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2201/00—Polymeric substrate or laminate
- B05D2201/02—Polymeric substrate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2451/00—Type of carrier, type of coating (Multilayers)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2508/00—Polyesters
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a thermoplastic composite film, which sequentially comprises a nano-scale titanium dioxide layer, a polyethylene glycol terephthalate layer, a modified polypropylene layer, a polyethylene glycol terephthalate layer and a nano-scale titanium dioxide layer from outside to inside, wherein the thickness of the two nano-scale titanium dioxide layers is 10-15 mu m, the thickness of the two polyethylene glycol terephthalate layers is 15-18 mu m, the thickness of the modified polypropylene layer is 25-50 μm, the modified polypropylene layer is obtained by casting modified polypropylene through a casting machine, the modified polypropylene is prepared by mixing 15-25 parts by weight of high-density polyethylene and 75-85 parts by weight of polypropylene and then performing melt blending extrusion by a double-screw extruder, and can solve the problems that the existing polypropylene composite film is poor in thermoplasticity and the polypropylene composite film is aged after being exposed in air for a long time.
Description
Technical Field
The invention relates to the technical field of composite films, in particular to a thermoplastic composite film and a production process thereof.
Background
The polypropylene is a thermoplastic synthetic resin with excellent performance, is colorless semitransparent thermoplastic light general-purpose plastic, and has excellent corrosion resistance and mechanical properties, but the polypropylene has the defects of poor comprehensive mechanical property, poor low-temperature toughness, poor dimensional stability, no aging resistance and the like, so that when the polypropylene composite film is produced by using the polypropylene, the polypropylene composite film has the condition of poor thermoplasticity, and in addition, the polypropylene composite film can be aged after being exposed in the air for a long time.
Publication No.: CN102286453A specifically discloses a cellulose acetate/polypropylene composite film prepared by taking cellulose acetate and a polypropylene film as materials, wherein the polypropylene composite film cannot solve the problem that the polypropylene is a thermoplastic synthetic resin with excellent performance, is colorless translucent thermoplastic light general-purpose plastic, and has excellent corrosion resistance and mechanical properties, but the polypropylene has the defects of poor comprehensive mechanical properties, poor low-temperature toughness, poor dimensional stability, no aging resistance and the like, so that when the polypropylene composite film is produced by using the polypropylene, the polypropylene composite film has the condition of poor thermoplasticity, and in addition, the polypropylene composite film can have the condition of aging after being exposed in the air for a long time.
Disclosure of Invention
The invention aims to provide a thermoplastic composite film and a production process thereof, which can solve the problems of poor thermoplasticity of the existing polypropylene composite film and aging of the polypropylene composite film after long-term exposure to air.
The purpose of the invention can be realized by the following technical scheme:
a thermoplastic composite film comprises a nanoscale titanium dioxide layer, a polyethylene terephthalate layer, a modified polypropylene layer, a polyethylene terephthalate layer and a nanoscale titanium dioxide layer in sequence from outside to inside, wherein the thickness of each of the two nanoscale titanium dioxide layers is 10-15 microns, the thickness of each of the two polyethylene terephthalate layers is 15-18 microns, the thickness of each of the modified polypropylene layers is 25-50 microns, the modified polypropylene layer is obtained by casting modified polypropylene through a casting machine, and the modified polypropylene is obtained by mixing 15-25 parts by weight of high-density polyethylene and 75-85 parts by weight of polypropylene and then carrying out melt blending extrusion through a double-screw extruder;
the preparation process of the modified polypropylene layer comprises the following steps:
the method comprises the following steps: placing high-density polyethylene into a vacuum drying box with the temperature of 60-65 ℃, drying by 60-90min, placing polypropylene into a vacuum drying box with the temperature of 80-85 ℃, drying by 120 min, cooling, uniformly mixing 15-25 parts by weight of high-density polyethylene and 75-85 parts by weight of polypropylene, and pouring into a feed inlet of a double-screw extruder;
step two: starting the first heating sheet, the second heating sheet, the third heating sheet, the fourth heating sheet, the fifth heating sheet and the sixth heating sheet so as to preheat the extrusion tube, wherein the heating temperature of the first heating sheet is 170-, the fourth helical gear drives the first straight-tooth cylindrical gear to rotate through the second rotating rod, the first straight-tooth cylindrical gear drives the second straight-tooth cylindrical gear and the third straight-tooth cylindrical gear to rotate, the second straight-tooth cylindrical gear drives the first screw rod to rotate, the third straight-tooth cylindrical gear drives the second screw rod to rotate, the rotating speed of the first screw rod and the rotating speed of the second screw rod are both 118 + 125r/mi, the high-density polyethylene and the polypropylene are melted in the extrusion pipe, the melted high-density polyethylene and the polypropylene are pushed towards the die head while being mixed under the stirring of the first screw rod and the second screw rod, and modified polypropylene particles are obtained by extrusion through the die head;
step three: the modified polypropylene particles are cast by a casting machine to obtain a modified polypropylene film, namely a modified polypropylene layer, for later use, and the temperature of a casting roller of the casting machine is 210-215 ℃.
A production process of a thermoplastic composite film comprises the following specific production steps:
s1, placing the modified polypropylene film into a feed inlet of a coating machine, coating polyethylene glycol terephthalate on both sides of the modified polypropylene film by using the coating machine to form polyethylene glycol terephthalate layers with the thickness of 15-18 mu m, and obtaining a first product;
s2, placing the first product into a feed inlet of vapor deposition equipment, and coating nano-scale titanium dioxide on both sides of the first product by using the vapor deposition equipment to form nano-scale titanium dioxide layers with the thickness of 10-15 mu m, so as to obtain the product thermoplastic composite film.
Preferably, the double-screw extruder comprises a fixed base, a motor, a speed change unit, an extrusion unit and a fixed frame, wherein the motor is arranged above the surface of the top of the fixed base, a support frame is arranged on one side of the motor, the speed change unit is arranged on the surface of the top of the support frame, the fixed frame is arranged on one side of the fixed base, the extrusion unit is arranged above the fixed frame, and a shell is arranged outside the extrusion unit;
the surface of one end of the motor rotating shaft is provided with a first flywheel, the speed changing unit comprises an upper fixed shell, a lower fixed shell, a first rotating rod and a second rotating rod, the left side wall and the right side wall of the speed changing unit are provided with three bearings on the surface, six bearings are positioned between the upper fixed shell and the lower fixed shell, the first rotating rod is arranged between the two bearings at the front side, one end of the first rotating rod extends to the outer side of the speed changing unit, the surface of one end of the first rotating rod is provided with a second flywheel, the second flywheel is rotatably connected with the first flywheel through a rotating belt, the outer sides of the first flywheel and the second flywheel are provided with a protective shell, the other end of the first rotating rod is provided with a first helical gear, a rotating rod is arranged between the two bearings adjacent to the first rotating rod, one end of the rotating rod is provided with a second helical gear, and the other end of the rotating, a second rotating rod is arranged between the two bearings at the rear side, one end of the second rotating rod extends to the outer side of the speed changing unit, a first straight-tooth cylindrical gear is arranged on the surface of one end of the second rotating rod, a fourth helical gear is arranged at the other end of the second rotating rod, one side of the first straight-tooth cylindrical gear is in meshing connection with a second straight-tooth cylindrical gear, the other side of the first straight-tooth cylindrical gear is in meshing connection with a third straight-tooth cylindrical gear, the size of the second straight-tooth cylindrical gear and the size of the third straight-tooth cylindrical gear are the same as the size of the first straight-tooth cylindrical gear, an extrusion pipe is arranged at one side of the speed changing unit, the second rotating rod is positioned inside a connecting pipe, and the connecting pipe is positioned between the speed changing;
first hob is installed perpendicularly on the surface of second straight-tooth spur gear one end, the second hob is installed perpendicularly on the surface of third straight-tooth spur gear one end, first hob and second hob are located the extrusion pipe insidely, install the feed inlet on the extrusion pipe, the extrusion pipe install first heating plate, second heating plate, third heating plate, fourth heating plate and fifth heating plate on the surface in proper order, extrude pipe one end and install the die head, the sixth heating plate is installed to die head one side, the bottom of first heating plate, second heating plate, third heating plate, fourth heating plate and fifth heating plate all installs radiator fan on the surface, just be connected with the heat dissipation copper pipe between radiator fan and the heating plate.
Preferably, the first rotating rod is movably connected with the speed changing unit through a bearing, and the second rotating rod is movably connected with the speed changing unit through a bearing.
Preferably, the outer diameter of the fourth helical gear is larger than that of the second helical gear, the outer diameter of the second helical gear is larger than that of the third helical gear, the outer diameter of the third helical gear is larger than that of the first helical gear, the first helical gear and the second helical gear are engaged, and the third helical gear are engaged.
Preferably, rotate between first hob and the second hob and be connected, first hob with extrude to rotate between the pipe and be connected, the second hob with extrude to rotate between the pipe and be connected, motor, first heating plate, second heating plate, third heating plate, fourth heating plate, fifth heating plate, sixth heating plate and cooling fan all are connected with the power through the wire.
Compared with the prior art, the invention has the beneficial effects that:
the invention uses high-density polyethylene to modify polypropylene, starts a first heating plate, a second heating plate, a third heating plate, a fourth heating plate, a fifth heating plate and a sixth heating plate to heat an extrusion pipe, starts a motor, a motor rotating shaft drives a first flywheel to rotate, the first flywheel drives a second flywheel to rotate through a rotating belt, the second flywheel drives a first helical gear to rotate through a first rotating rod, the first helical gear drives a second helical gear to rotate, the second helical gear drives a third helical gear to rotate through a rotating rod, the third helical gear drives a fourth helical gear to rotate, the fourth helical gear drives a first straight toothed spur gear to rotate through a second rotating rod, the first straight toothed spur gear drives a second straight toothed spur gear and a third straight toothed spur gear to rotate, the second straight toothed spur gear drives a first helical rod to rotate, thereby the second hob is driven to rotate by the third straight-tooth cylindrical gear, and the high-density polypropylene and the polypropylene are uniformly mixed and then are added into the extrusion pipe from the feed inlet, and the high-density polyethylene and the polypropylene are changed into a molten state in the extrusion pipe, and are stirred and mixed at the first hob and the second hob, and are finally extruded from the die head to obtain modified polypropylene, wherein the modified polypropylene has excellent toughness, so that the problem that the thermoplastic property of the existing polypropylene composite film is not added is solved.
The invention firstly coats the polyethylene glycol terephthalate on the two sides of the modified polypropylene layer, and then coats the nano-titanium dioxide, the polyethylene glycol terephthalate has good mechanical property, the impact strength is 3-5 times of other films, the polyethylene glycol terephthalate has strong corrosion resistance, the influence of high temperature and low temperature on the mechanical property is small, simultaneously, the polyethylene glycol terephthalate has excellent barrier property, oxygen and water in the air can be blocked from contacting with the polypropylene film, the nano-titanium dioxide has high chemical stability, the nano-titanium dioxide has a photocatalysis function, various organic matters and partial inorganic matters such as formaldehyde and the like which are attached to the surface of an object can be catalyzed and photolyzed under the illumination condition, the existence of the polyethylene glycol terephthalate and the nano-titanium dioxide not only improves the chemical stability of the polypropylene composite film, but also improves the mechanical property of the polypropylene composite film, thereby the problem that the thermoplastic effect of the existing polypropylene composite film is not good and the problem that the polypropylene composite film is aged after being exposed in the air for a long time are solved.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a main body of a twin-screw extruder;
FIG. 2 is a schematic structural view of a variable speed unit of the twin-screw extruder;
FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;
FIG. 4 is a schematic view of the structure of an extruded tube of a twin-screw extruder;
FIG. 5 is a schematic structural view of a first screw rod and a second screw rod of a twin-screw extruder;
FIG. 6 is an enlarged schematic view of the structure at B in FIG. 5;
in the figure: 1. a fixed base; 2. a motor; 3. a protective shell; 4. a speed change unit; 5. a feed inlet; 6. an extrusion unit; 7. a housing; 8. a fixed mount; 9. a first flywheel; 10. a second flywheel; 11. rotating the belt; 12. a first rotating lever; 13. a first helical gear; 14. a second helical gear; 15. a third bevel gear; 16. a fourth helical gear; 17. a second rotating lever; 18. a first spur gear; 19. a second spur gear; 20. a third spur gear; 21. a first screw rod; 22. a second screw rod; 23. a first heating sheet; 24. a second heating plate; 25. a third heating plate; 26. a fourth heating plate; 27. fifthly, hot slices; 28. a sixth heating plate; 29. a heat radiation fan; 30. extruding a pipe; 31. a die head.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, a thermoplastic composite film comprises a nanoscale titanium dioxide layer, a polyethylene terephthalate layer, a modified polypropylene layer, a polyethylene terephthalate layer and a nanoscale titanium dioxide layer in sequence from outside to inside, wherein the thickness of each of the two nanoscale titanium dioxide layers is 10-15 μm, the thickness of each of the two polyethylene terephthalate layers is 15-18 μm, the thickness of each of the modified polypropylene layers is 25-50 μm, the modified polypropylene layer is obtained by casting modified polypropylene through a casting machine, and the modified polypropylene is obtained by mixing 15-25 parts by weight of high-density polyethylene and 75-85 parts by weight of polypropylene and melt blending and extruding the mixture through a twin-screw extruder;
the preparation process of the modified polypropylene layer comprises the following steps:
the method comprises the following steps: placing high-density polyethylene into a vacuum drying box with the temperature of 60-65 ℃, drying by 60-90min, placing polypropylene into a vacuum drying box with the temperature of 80-85 ℃, drying by 120 min, cooling, uniformly mixing 15-25 parts by weight of high-density polyethylene and 75-85 parts by weight of polypropylene, and pouring into a feed inlet 5 of a double-screw extruder;
step two: the first heating sheet 23, the second heating sheet 24, the third heating sheet 25, the fourth heating sheet 26, the fifth heating sheet 27 and the sixth heating sheet 28 are started, so as to preheat the extrusion tube 30, the heating temperature of the first heating sheet 23 is 175 ℃ in 170 plus-material mode, the heating temperature of the second heating sheet 24 is 185 ℃ in 180 plus-material mode, the heating temperature of the third heating sheet 25 is 192 ℃ in 188 plus-material mode, the heating temperature of the fourth heating sheet 26 is 202 ℃ in 197 plus-material mode, the heating temperature of the fifth heating sheet 27 is 208 ℃ in 205 plus-material mode, the heating temperature of the sixth heating sheet 28 is 203 ℃ in 200 plus-material mode, the motor 2 rotates to drive the first flywheel 9 to rotate, the first flywheel 9 rotates to drive the second flywheel 10 to rotate by rotating the belt 11, the second flywheel 10 drives the first helical gear 13 to rotate by the first rotating rod 12, the first helical gear 13 drives the second helical gear 14 to rotate, the second helical gear 14 drives the third helical gear 15 to rotate by the rotating rod, the third helical gear 15 drives the fourth helical gear 16 to rotate, the fourth helical gear 16 drives the first spur gear 18 to rotate through the second rotating rod 17, the first spur gear 18 drives the second spur gear 19 and the third spur gear 20 to rotate, the second spur gear 19 drives the first screw rod 21 to rotate, the third spur gear 20 drives the second screw rod 22 to rotate, the rotating speed of the first screw rod 21 and the rotating speed of the second screw rod 22 are both 118 and 125r/mi, the high-density polyethylene and the polypropylene are melted in the extrusion pipe 30, and the melted high-density polyethylene and the melted polypropylene are mixed under the stirring of the first screw rod 21 and the second screw rod 22 and are pushed towards the direction of the die head 31, and modified polypropylene particles are obtained through the extrusion of the die head 31;
step three: the modified polypropylene particles are cast by a casting machine to obtain a modified polypropylene film, namely a modified polypropylene layer, for later use, and the temperature of a casting roller of the casting machine is 210-215 ℃. The model of the casting machine is WS-135 and 2500.
A production process of a thermoplastic composite film comprises the following specific production steps:
s1, placing the modified polypropylene film into a feed inlet of a coating machine, coating polyethylene glycol terephthalate on both sides of the modified polypropylene film by using the coating machine to form polyethylene glycol terephthalate layers with the thickness of 15-18 mu m, and obtaining a first product; the model of the coating machine: WCJX-JCM-1500-;
s2, placing the first product into a feed inlet of vapor deposition equipment, and coating nano-scale titanium dioxide on both sides of the first product by using the vapor deposition equipment to form nano-scale titanium dioxide layers with the thickness of 10-15 mu m, so as to obtain the product thermoplastic composite film. The type of vapor deposition apparatus: TF 1700-80.
The double-screw extruder comprises a fixed base 1, a motor 2, a speed change unit 4, an extrusion unit 6 and a fixed frame 8, wherein the motor 2 is installed above the top surface of the fixed base 1, a support frame is installed on one side of the motor 2, the speed change unit 4 is installed on the surface of the top of the support frame, the fixed frame 8 is installed on one side of the fixed base 1, the extrusion unit 6 is installed above the fixed frame 8, and a shell 7 is installed outside the extrusion unit 6;
a first flywheel 9 is arranged on the surface of one end of a rotating shaft of the motor 2, the speed change unit 4 comprises an upper fixed shell, a lower fixed shell, a first rotating rod 12 and a second rotating rod 17, three bearings are arranged on the surfaces of the left side wall and the right side wall of the speed change unit 4, six bearings are positioned between the upper fixed shell and the lower fixed shell, the first rotating rod 12 is arranged between the two bearings on the front side, one end of the first rotating rod 12 extends to the outer side of the speed change unit 4, a second flywheel 10 is arranged on the surface of one end of the first rotating rod 12, the second flywheel 10 is rotatably connected with the first flywheel 9 through a rotating belt 11, a protective shell 3 is arranged on the outer sides of the first flywheel 9 and the second flywheel 10, a first flywheel 13 is arranged on the other end of the first rotating rod 12, a rotating rod is arranged between the two bearings adjacent to the first rotating rod 12, and a, a third bevel gear 15 is installed at the other end of the rotating rod, a second rotating rod 17 is installed between two bearings at the rear side, one end of the second rotating rod 17 extends to the outer side of the speed changing unit 4, a first straight-toothed cylindrical gear 18 is installed on the surface of one end of the second rotating rod 17, a fourth bevel gear 16 is installed at the other end of the second rotating rod 17, a second straight-toothed cylindrical gear 19 is connected to one side of the first straight-toothed cylindrical gear 18 in a meshed mode, a third straight-toothed cylindrical gear 20 is connected to the other side of the first straight-toothed cylindrical gear 18 in a meshed mode, the size of the second straight-toothed cylindrical gear 19 and the size of the third straight-toothed cylindrical gear 20 are the same as the size of the first straight-toothed cylindrical gear 18, an extrusion pipe 30 is installed at one side of the speed changing unit 4, the second rotating rod 17 is located;
a first spiral rod 21 is vertically arranged on the surface of one end of a second straight toothed spur gear 19, a second spiral rod 22 is vertically arranged on the surface of one end of a third straight toothed spur gear 20, the first spiral rod 21 and the second spiral rod 22 are positioned inside an extrusion pipe 30, a feed inlet 5 is arranged on the extrusion pipe 30, a first heating plate 23, a second heating plate 24, a third heating plate 25, a fourth heating plate 26 and a fifth heating plate 27 are sequentially arranged on the surface of the extrusion pipe 30, a die head 31 is arranged at one end of the extrusion pipe 30, a sixth heating plate 28 is arranged on one side of the die head 31, heat dissipation fans 29 are respectively arranged on the surfaces of the bottoms of the first heating plate 23, the second heating plate 24, the third heating plate 25, the fourth heating plate 26 and the fifth heating plate 27, and a heat dissipation copper pipe is connected between the heat dissipation fans 29 and the heating plates.
The first rotating rod 12 is movably connected with the speed changing unit 4 through a bearing, and the second rotating rod 17 is movably connected with the speed changing unit 4 through a bearing.
The outer diameter of the fourth helical gear 16 is larger than that of the second helical gear 14, the outer diameter of the second helical gear 14 is larger than that of the third helical gear 15, the outer diameter of the third helical gear 15 is larger than that of the first helical gear 13, the first helical gear 13 and the second helical gear 14 are meshed, and the third helical gear 15 and the third helical gear 16 are meshed.
The first screw rod 21 is rotatably connected with the second screw rod 22, the first screw rod 21 is rotatably connected with the extrusion pipe 30, and the second screw rod 22 is rotatably connected with the extrusion pipe 30.
Example 1
A thermoplastic composite film comprises a nanoscale titanium dioxide layer, a polyethylene terephthalate layer, a modified polypropylene layer, a polyethylene terephthalate layer and a nanoscale titanium dioxide layer in sequence from outside to inside, wherein the thicknesses of the two nanoscale titanium dioxide layers are 11 microns, the thicknesses of the two polyethylene terephthalate layers are 16 microns, the thickness of the modified polypropylene layer is 30 microns, the modified polypropylene layer is obtained by casting modified polypropylene through a casting machine, and the modified polypropylene is obtained by mixing 20 parts by weight of high-density polyethylene and 80 parts by weight of polypropylene and then melting, blending and extruding the mixture through a double-screw extruder;
the preparation process of the modified polypropylene layer comprises the following steps:
the method comprises the following steps: placing high-density polyethylene into a vacuum drying box with the temperature of 62 ℃, drying by 60 min, placing polypropylene into a vacuum drying box with the temperature of 80 ℃, drying by 120 min, cooling, uniformly mixing 20 parts by weight of high-density polyethylene and 80 parts by weight of polypropylene, and pouring into a feed inlet 5 of a double-screw extruder;
step two: the first heating plate 23, the second heating plate 24, the third heating plate 25, the fourth heating plate 26, the fifth heating plate 27 and the sixth heating plate 28 are started to preheat the extrusion tube 30, the first heating plate 23 is heated to 172 ℃, the second heating plate 24 is heated to 182 ℃, the third heating plate 25 is heated to 190 ℃, the fourth heating plate 26 is heated to 198 ℃, the fifth heating plate 27 is heated to 205 ℃, the sixth heating plate 28 is heated to 201 ℃, the motor 2 is started, the rotating shaft of the motor 2 drives the first flywheel 9 to rotate, the first flywheel 9 drives the second flywheel 10 to rotate by rotating the belt 11, the second flywheel 10 drives the first helical gear 13 to rotate by the first rotating rod 12, the first helical gear 13 drives the second helical gear 14 to rotate, the second helical gear 14 drives the third helical gear 15 to rotate by the rotating rod, the third helical gear 15 drives the fourth helical gear 16 to rotate, the fourth helical gear 16 drives the first spur gear 18 to rotate through the second rotating rod 17, the first spur gear 18 drives the second spur gear 19 and the third spur gear 20 to rotate, the second spur gear 19 drives the first screw rod 21 to rotate, the third spur gear 20 drives the second screw rod 22 to rotate, the rotating speed of the first screw rod 21 and the rotating speed of the second screw rod 22 are both 118r/mi n, the high-density polyethylene and the polypropylene are melted in the extrusion pipe 30, the melted high-density polyethylene and the melted polypropylene are pushed towards the die head 31 while being mixed under the stirring of the first screw rod 21 and the second screw rod 22, and modified polypropylene particles are obtained by extrusion through the die head 31;
step three: and (3) casting the modified polypropylene particles by using a casting machine to obtain a modified polypropylene film, namely a modified polypropylene layer, for later use, wherein the temperature of a casting roller of the casting machine is 212 ℃.
A production process of a thermoplastic composite film comprises the following specific production steps:
s1, placing the modified polypropylene film into a feed inlet of a coating machine, coating polyethylene terephthalate on both sides of the modified polypropylene film by using the coating machine to form polyethylene terephthalate layers with the thickness of 16 mu m, and obtaining a first product;
s2, placing the first product into a feed inlet of vapor deposition equipment, and coating nano-scale titanium dioxide on both sides of the first product by using the vapor deposition equipment to form nano-scale titanium dioxide layers with the thickness of 11 mu m, so as to obtain the product thermoplastic composite film.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. A thermoplastic composite film is characterized by comprising a nanoscale titanium dioxide layer, a polyethylene glycol terephthalate layer, a modified polypropylene layer, a polyethylene glycol terephthalate layer and a nanoscale titanium dioxide layer from outside to inside in sequence, wherein the thickness of each of the two nanoscale titanium dioxide layers is 10-15 mu m, the thickness of each of the two polyethylene glycol terephthalate layers is 15-18 mu m, and the thickness of each of the modified polypropylene layers is 25-50 mu m;
the modified polypropylene layer is obtained by casting modified polypropylene through a casting machine, the modified polypropylene is obtained by mixing 15-25 parts by weight of high-density polyethylene and 75-85 parts by weight of polypropylene and performing melt blending extrusion through a double-screw extruder, and the preparation process of the modified polypropylene layer comprises the following steps:
the method comprises the following steps: placing high-density polyethylene into a vacuum drying box with the temperature of 60-65 ℃, drying for 60-90min, placing polypropylene into a vacuum drying box with the temperature of 80-85 ℃, drying for 120-85 min, cooling, uniformly mixing 15-25 parts by weight of high-density polyethylene and 75-85 parts by weight of polypropylene, and pouring the mixture into a feed inlet (5) of a double-screw extruder;
step two: starting a first heating sheet (23), a second heating sheet (24), a third heating sheet (25), a fourth heating sheet (26), a fifth heating sheet (27) and a sixth heating sheet (28) so as to preheat the extrusion pipe (30), wherein the heating temperature of the first heating sheet (23) is 175-, the first helical gear (13) drives the second helical gear (14) to rotate, the second helical gear (14) drives the third helical gear (15) to rotate through a rotating rod, the third helical gear (15) drives the fourth helical gear (16) to rotate, the fourth helical gear (16) drives the first spur gear (18) to rotate through a second rotating rod (17), the first spur gear (18) drives the second spur gear (19) and the third spur gear (20) to rotate, the second spur gear (19) drives the first helical rod (21) to rotate, the third spur gear (20) drives the second helical rod (22) to rotate, the rotating speed of the first helical rod (21) and the rotating speed of the second helical rod (22) are both 118 and 125r/min, and the high-density polyethylene and the polypropylene are melted in the extrusion pipe (30), the molten high-density polyethylene and the polypropylene are mixed under the stirring of the first screw rod (21) and the second screw rod (22) and simultaneously pushed towards the direction of a die head (31), and modified polypropylene particles are obtained by extrusion through the die head (31);
step three: the modified polypropylene particles are cast by a casting machine to obtain a modified polypropylene film, namely a modified polypropylene layer, for later use, and the temperature of a casting roller of the casting machine is 210-215 ℃.
2. The production process of the thermoplastic composite film is characterized by comprising the following specific production steps:
s1, placing the modified polypropylene film into a feed inlet of a coating machine, coating polyethylene glycol terephthalate on both sides of the modified polypropylene film by using the coating machine to form polyethylene glycol terephthalate layers with the thickness of 15-18 mu m, and obtaining a first product;
s2, placing the first product into a feed inlet of vapor deposition equipment, and coating nano-scale titanium dioxide on both sides of the first product by using the vapor deposition equipment to form nano-scale titanium dioxide layers with the thickness of 10-15 mu m, so as to obtain the product thermoplastic composite film.
3. The thermoplastic composite film according to claim 1, wherein the twin-screw extruder comprises a fixed base (1), a motor (2), a speed change unit (4), an extrusion unit (6) and a fixed frame (8), the motor (2) is installed above the top surface of the fixed base (1), a support frame is installed on one side of the motor (2), the speed change unit (4) is installed on the surface of the top of the support frame, the fixed frame (8) is installed on one side of the fixed base (1), the extrusion unit (6) is installed above the fixed frame (8), and a shell (7) is installed on the outer side of the extrusion unit (6);
the surface of one end of a rotating shaft of the motor (2) is provided with a first flywheel (9), the speed change unit (4) comprises an upper fixed shell, a lower fixed shell, a first rotating rod (12) and a second rotating rod (17), the left side wall and the right side wall of the speed change unit (4) are provided with three bearings on the surface, six bearings are positioned between the upper fixed shell and the lower fixed shell, the first rotating rod (12) is arranged between two bearings on the front side, one end of the first rotating rod (12) extends to the outer side of the speed change unit (4) and one end of the first rotating rod (12) is provided with a second flywheel (10) on the surface, the second flywheel (10) is rotatably connected with the first flywheel (9) through a rotating belt (11), the outer sides of the first flywheel (9) and the second flywheel (10) are provided with a protective shell (3), and the other end of the first rotating rod (12) is provided with a first helical gear (13), install the rotary rod with first dwang (12) between two adjacent bearings, second helical gear (14) are installed to the one end of rotary rod, third helical gear (15) are installed to the other end of rotary rod, install second dwang (17) between two bearings of rear side, second dwang (17) one end extends to the outside of speed change unit (4) and the surface of second dwang (17) one end is installed first spur gear (18), install fourth helical gear (16) on the other end of second dwang (17), one side meshing of first spur gear (18) is connected with second spur gear (19), the opposite side meshing of first spur gear (18) is connected with third spur gear (20), the size of second spur gear (19), the size of third spur gear (20) all are the same with the size of first spur gear (18), the extrusion unit (6) comprises an extrusion pipe (30), the extrusion pipe (30) is installed on one side of the speed change unit, the second rotating rod (17) is located inside a connecting pipe, and the connecting pipe is located between the speed change unit (4) and the extrusion pipe (30);
the utility model discloses a heat radiation fan, including extrusion pipe (30), first straight-tooth spur gear (19), first hob (21) is installed perpendicularly on the surface of second straight-tooth spur gear (19) one end, second hob (22) is installed perpendicularly on the surface of third straight-tooth spur gear (20) one end, first hob (21) is located inside extrusion pipe (30) with second hob (22), install feed inlet (5) on extrusion pipe (30), install first heating plate (23), second heating plate (24), third heating plate (25), fourth heating plate (26) and fifth heating plate (27) on the surface of extrusion pipe (30) in proper order, die head (31) is installed to extrusion pipe (30) one end, sixth heating plate (28) is installed to die head (31) one side, all install cooling fan (29) on the bottom surface of first heating plate (23), second heating plate (24), third heating plate (25), fourth heating plate (26) and fifth heating plate (27), and a heat radiation copper pipe is connected between the heat radiation fan (29) and the heating sheet.
4. Thermoplastic composite film according to claim 3, characterised in that said first rotating lever (12) is in movable connection with the speed transforming unit (4) by means of a bearing and said second rotating lever (17) is in movable connection with the speed transforming unit (4) by means of a bearing.
5. A thermoplastic composite film according to claim 3, wherein said fourth helical gear (16) has an outer diameter greater than that of said second helical gear (14), said second helical gear (14) has an outer diameter greater than that of said third helical gear (15), said third helical gear (15) has an outer diameter greater than that of said first helical gear (13), said first helical gear (13) meshes with said second helical gear (14), and said third helical gear (15) meshes with said third helical gear (16).
6. Thermoplastic composite film according to claim 3, wherein said first screw (21) is in rotational connection with said second screw (22), said first screw (21) is in rotational connection with said extrusion tube (30), and said second screw (22) is in rotational connection with said extrusion tube (30).
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