CN113276377A - Preparation method of high-strength high-toughness polystyrene film - Google Patents
Preparation method of high-strength high-toughness polystyrene film Download PDFInfo
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- CN113276377A CN113276377A CN202110580860.7A CN202110580860A CN113276377A CN 113276377 A CN113276377 A CN 113276377A CN 202110580860 A CN202110580860 A CN 202110580860A CN 113276377 A CN113276377 A CN 113276377A
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- 239000004793 Polystyrene Substances 0.000 title claims abstract description 84
- 229920002223 polystyrene Polymers 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000010408 film Substances 0.000 claims description 106
- 238000005266 casting Methods 0.000 claims description 60
- 239000000155 melt Substances 0.000 claims description 54
- 238000001125 extrusion Methods 0.000 claims description 51
- 238000007664 blowing Methods 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 2
- 239000010409 thin film Substances 0.000 claims description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 229920006125 amorphous polymer Polymers 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002464 physical blending Methods 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003075 superhydrophobic effect Effects 0.000 description 1
Images
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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
- B29K2025/04—Polymers of styrene
- B29K2025/06—PS, i.e. polystyrene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
Abstract
The invention provides a preparation method of a high-strength high-toughness polystyrene film, which has the advantages of simple preparation process, high production efficiency and capability of realizing large-scale production.
Description
Technical Field
The invention relates to a preparation method of a high-strength high-toughness polystyrene film.
Background
Polystyrene is prepared by free radical polymerization of styrene monomers, and lateral phenyl groups of the polystyrene are arranged in a random structure in space, so the polystyrene is an amorphous polymer and has high transparency. The side phenyl group of the polystyrene has larger volume and larger steric hindrance effect, so that the movement space of the molecular chain is limited, and the molecular chain of the polystyrene becomes rigid, thereby showing rigidity and brittleness, and the product is easy to generate internal stress. The polystyrene product generally has a low elongation at break of only about 3% during the stretching process, has no yield phenomenon, and shows a typical brittle fracture, thereby resulting in a limited range of use of the polystyrene product.
In order to increase the using place of polystyrene and prolong the service life of polystyrene in the using place, the method of modifying polystyrene and changing processing technology is generally adopted in the market to improve the performance of products, for example, physical blending or chemical blending is adopted to realize the improvement of the flame retardant, the electric conduction, the super-hydrophobic property and the like of the polystyrene, and the biaxial stretching process is adopted to improve the strength, the toughness and the like of the polystyrene, the method is adopted to greatly improve the performance of the polystyrene in all aspects, however, there are certain disadvantages, such as the need to add various materials during the modification, this results in an extremely complicated process and a part of the raw materials are extremely expensive, especially involving the use of equipment in the biaxial stretching process, which results in a great trouble in commercialization of the polystyrene-related products.
Disclosure of Invention
The invention aims to provide a preparation method of a high-strength high-toughness polystyrene film, which is used for solving the problems of complex processing technology, high cost and crisp product texture of the existing polystyrene.
In order to realize the purpose, the technical scheme is as follows: a preparation method of a high-strength high-toughness polystyrene film comprises the following steps:
melting polystyrene in an extruder to obtain a melt, extruding the melt by the extruder, cooling and shaping by an air knife, stretching by a casting roll, passing through a high-temperature roll, and drawing by a drawing roll, and finally winding to form a film to obtain the high-strength high-toughness polystyrene film;
wherein the temperature of an extrusion opening film of the extruder is 220-280 ℃, and the ratio of the melt to the film extrusion speed and the linear speed of a casting roller is 1: (20-65), the air knife is arranged between the extrusion port film and the casting roll, an included angle formed by the air port direction of the air knife and the surface of the melt is 45-90 degrees, the temperature of the high-temperature roll is 25-90 degrees, and the linear velocity ratio of the traction roll to the high-temperature roll is 1: (1.5-5).
The preparation method of the high-strength and high-toughness polystyrene film only adopts polystyrene as a raw material and does not add any processing aid.
Preferably, the temperature of the extrusion opening film is 250-280 ℃, and the ratio of the melt speed at the extrusion opening film to the linear speed of the casting roller is 1: (50-65), wherein the linear speed ratio of the high-temperature roller to the drawing roller is 1: (2-3). More preferably, the temperature of the extrusion die film is 260 ℃ to 270 ℃.
Preferably, the air blowing quantity of the air knife is 50m3/min～250m3Min; the blast temperature of the air knife is 0-100 ℃.
Preferably, the cooling mode of the air knife is roller cooling, and the air blast temperature of the air knife is 0-80 ℃.
Preferably, the distance between the extrusion port film and the casting roller is 100 mm-300 mm; the roll temperature of the casting roll is 0-115 ℃.
Preferably, the distance between the extrusion port film and the casting roller is 150 mm-250 mm, and the roller temperature of the casting roller is 25-80 ℃.
Preferably, the melt index of the polystyrene is 1.5g/10 min-5 g/10min, and the test condition is that a 2.5kg load test is adopted at 200 ℃;
preferably, the temperature zones of the extruder are set to 260 ℃ (feed zone) -265 ℃ -270 ℃ (transition zone) -270 ℃ (vent zone), respectively.
The preparation method of the invention uses the melt extrusion casting process, the air knife is arranged between the extrusion port film and the casting roller, the included angle formed by the air port direction of the air knife and the melt surface is 45-90 degrees, and the special chain structure formed after drafting can be effectively cooled and shaped, thereby preparing the polystyrene film with high transparency and high elongation at break, and the prepared polystyrene film also has good air permeability.
The invention also provides a high-strength high-toughness polystyrene film which is prepared by adopting the preparation method.
Preferably, the elongation at break of the high-strength high-toughness polystyrene film is 40-70%.
Has the advantages that:
the invention provides a preparation method of a high-strength high-toughness polystyrene film, which has the advantages of simple preparation process, high production efficiency and capability of realizing large-scale production.
Drawings
FIG. 1 is a diagram of mechanical properties of a high-strength high-toughness polystyrene film obtained by melt at different speed ratios of a screw extrusion port film speed and a casting roll linear speed in an embodiment of the invention.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
In the embodiment, GPPS (general purpose polystyrene) with a melt index of 1.5g/10min is put into a screw extruder after the temperature of the screw extruder reaches a preset temperature, namely the temperature of each zone reaches 260 ℃ (a charging zone) -265 ℃ -270 ℃ (a transition zone) -270 ℃ (a film opening zone), waiting for 3-5 min, starting a device (an air knife) to melt the GPPS (general purpose polystyrene), starting the air knife when a melt is extruded from the screw extruder to be stable, cooling the melt by the air knife, stretching by a casting roller, passing through a high-temperature roller, drawing by a drawing roller, and finally winding to form a film to obtain the high-strength high-toughness polystyrene film; wherein the temperature of an extrusion opening film of the screw extruder is 260-270 ℃, and the ratio of the melt at the screw extrusion opening film speed to the casting roll linear speed is 1: 65, the air knife is arranged between the extrusion port film and the casting roller, the included angle formed by the air port direction of the air knife and the surface of the melt is 75 degrees, the distance between the extrusion port film and the casting roller is 150mm, and the blowing amount of the air knife is 150m3Min, the blowing temperature of an air knife is 10 ℃, the roll temperature of a casting roll is 40 ℃, the temperature of a high-temperature roll is 70 ℃, and the linear speed ratio of a traction roll to the high-temperature roll is 1:3。
the thickness of the high-strength and high-toughness polystyrene film prepared by the embodiment is 25 +/-2 microns, and the elongation at break of the film averagely reaches 50 percent and can reach 69 percent at most.
Example 2
In the embodiment, GPPS (general purpose polystyrene) with a melt index of 2.5g/10min is placed into a screw extruder after the temperature of the screw extruder reaches a preset temperature, namely the temperature of each zone reaches 260 ℃ (a charging zone) -265 ℃ -270 ℃ (a transition zone) -270 ℃ (a film opening zone), waiting for 3-5 min, starting a device (an air knife) to melt the GPPS (general purpose polystyrene), starting the air knife when a melt is extruded from the screw extruder to be stable, cooling the melt by the air knife, stretching by a casting roller, passing through a high-temperature roller, drawing by a drawing roller, and finally winding to form a film to obtain the high-strength high-toughness polystyrene film; wherein the temperature of an extrusion opening film of the screw extruder is 260-270 ℃, and the ratio of the melt at the screw extrusion opening film speed to the casting roll linear speed is 1: 50, the air knife is arranged between the extrusion port film and the casting roller, the included angle formed by the air port direction of the air knife and the surface of the melt is 75 degrees, the distance between the extrusion port film and the casting roller is 150mm, and the blowing amount of the air knife is 150m3Min, the blowing temperature of an air knife is 10 ℃, the roll temperature of a casting roll is 40 ℃, the temperature of a high-temperature roll is 70 ℃, and the linear speed ratio of a traction roll to the high-temperature roll is 1: 3.
the thickness of the high-strength and high-toughness polystyrene film prepared by the embodiment is 40 +/-3 mu m, and the elongation at break is averagely 20%.
Example 3
In the embodiment, GPPS (general purpose polystyrene) with a melt index of 1.5g/10min is put into a screw extruder after the temperature of the screw extruder reaches a preset temperature, namely the temperature of each zone reaches 260 ℃ (a charging zone) -265 ℃ -270 ℃ (a transition zone) -270 ℃ (a film opening zone), waiting for 3-5 min, starting a device (an air knife) to melt the GPPS (general purpose polystyrene), starting the air knife when a melt is extruded from the screw extruder to be stable, cooling the melt by the air knife, stretching by a casting roller, passing through a high-temperature roller, drawing by a drawing roller, and finally winding to form a film to obtain the high-strength high-toughness polystyrene film; wherein, the screw rodThe temperature of an extrusion opening film of the extruder is 260-270 ℃, and the ratio of the melt at the screw extrusion opening film speed to the linear speed of the casting roll is 1: 50, the air knife is arranged between the extrusion port film and the casting roller, the included angle formed by the air port direction of the air knife and the surface of the melt is 75 degrees, the distance between the extrusion port film and the casting roller is 150mm, and the blowing amount of the air knife is 150m3Min, the blowing temperature of an air knife is 10 ℃, the roll temperature of a casting roll is 40 ℃, the temperature of a high-temperature roll is 70 ℃, and the linear speed ratio of a traction roll to the high-temperature roll is 1: 3.
the thickness of the high-strength and high-toughness polystyrene film prepared by the embodiment is 50 +/-3 mu m, and the elongation at break is averagely 20%.
Example 4
In the embodiment, GPPS (general purpose polystyrene) with a melt index of 2.5g/10min is placed into a screw extruder after the temperature of the screw extruder reaches a preset temperature, namely the temperature of each zone reaches 260 ℃ (a charging zone) -265 ℃ -270 ℃ (a transition zone) -270 ℃ (a film opening zone), waiting for 3-5 min, starting a device (an air knife) to melt the GPPS (general purpose polystyrene), starting the air knife when a melt is extruded from the screw extruder to be stable, cooling the melt by the air knife, stretching by a casting roller, passing through a high-temperature roller, drawing by a drawing roller, and finally winding to form a film to obtain the high-strength high-toughness polystyrene film; wherein the temperature of an extrusion opening film of the screw extruder is 260-270 ℃, and the ratio of the melt at the screw extrusion opening film speed to the casting roll linear speed is 1: 65, the air knife is arranged between the extrusion port film and the casting roller, the included angle formed by the air port direction of the air knife and the surface of the melt is 75 degrees, the distance between the extrusion port film and the casting roller is 150mm, and the blowing amount of the air knife is 150m3Min, the blowing temperature of an air knife is 10 ℃, the roll temperature of a casting roll is 40 ℃, the temperature of a high-temperature roll is 70 ℃, and the linear speed ratio of a traction roll to the high-temperature roll is 1: 3.
the thickness of the high-strength and high-toughness polystyrene film prepared by the embodiment is 20 +/-2 microns, and the elongation at break is averagely 20%.
Example 5
In this example, a high-strength and high-toughness polystyrene film was prepared by the same method as in example 1, but the ratio of the film speed at the screw extrusion port to the linear speed of the casting roll in this example was 1: 20. 1: 40. 1: 50 and 1: 65, the mechanical properties of the obtained polystyrene thin film are shown in FIG. 1, and the results show that the elongation at break of the polystyrene cast film is increased with the increase of the draft ratio. The polystyrene film prepared by the method can strengthen and toughen the polystyrene film.
Comparative example 1
In the embodiment, GPPS (general purpose polystyrene) with a melt index of 1.5g/10min is put into a screw extruder after the temperature of the screw extruder reaches a preset temperature, namely the temperature of each zone reaches 260 ℃ (a feeding zone) -265 ℃ -270 ℃ (a transition zone) -270 ℃ (a film opening zone), waiting for 3-5 min, starting a device (a wind removing knife), melting the GPPS (general purpose polystyrene), starting the wind knife when a melt is extruded from the screw extruder to be stable, cooling the melt by the wind knife, stretching by a casting roller, passing through a high-temperature roller, drawing by a drawing roller, and finally winding to form a film to obtain a polystyrene film; wherein the temperature of an extrusion opening film of the screw extruder is 260-270 ℃, and the ratio of the melt at the screw extrusion opening film speed to the casting roll linear speed is 1: 20, the air knife is arranged between the extrusion port film and the casting roller, the included angle formed by the air port direction of the air knife and the surface of the melt is 75 degrees, the distance between the extrusion port film and the casting roller is 150mm, and the blowing amount of the air knife is 150m3Min, the blowing temperature of an air knife is 10 ℃, the roll temperature of a casting roll is 40 ℃, the temperature of a high-temperature roll is 25 ℃, and the linear speed ratio of a traction roll to the high-temperature roll is 1: 1.5.
the comparative example prepared a polystyrene film having a thickness of 130. + -.2 μm and an average elongation at break of 3%, which was thicker than the polystyrene film having an elongation at break of 69% prepared in example 1, and showed brittleness and rigidity inherent to polystyrene.
Comparative example 2
In this embodiment, after the temperature of the screw extruder reaches a preset temperature, that is, the temperature of each zone reaches 260 ℃ (the charging zone) -265 ℃ -270 ℃ (the transition zone) -270 ℃ (the mouth membrane zone), GPPS (general purpose polystyrene) with a melt index of 1.5g/10min is placed into the screw extruder, and waits for 3-5 min, a device (air knife) is started, and GPPS (general purpose polystyrene) is placed into the screw extruderAlkene) melting, opening an air knife when the melt is extruded by a screw extruder to be stable, cooling the melt by the air knife, stretching by a casting roller, passing through a high-temperature roller, and drawing by a drawing roller, and finally winding to form a film to obtain a polystyrene film; wherein the temperature of an extrusion opening film of the screw extruder is 260-270 ℃, and the ratio of the melt at the screw extrusion opening film speed to the casting roll linear speed is 1: 20, the air knife is arranged between the extrusion port film and the casting roller, the included angle formed by the air port direction of the air knife and the surface of the melt is 75 degrees, the distance between the extrusion port film and the casting roller is 150mm, and the blowing amount of the air knife is 150m3Min, the blowing temperature of an air knife is 10 ℃, the roll temperature of a casting roll is 110 ℃, the temperature of a high-temperature roll is 25 ℃, and the linear speed ratio of a traction roll to the high-temperature roll is 1: 1.5.
the comparative example prepared a polystyrene film having a thickness of 130. + -.2 μm and an average elongation at break of 3%, which was thicker than the polystyrene film having an elongation at break of 69% prepared in example 1, and showed brittleness and rigidity inherent to polystyrene.
Comparative example 3
In the embodiment, GPPS (general purpose polystyrene) with a melt index of 5g/10min is put into a screw extruder after the temperature of the screw extruder reaches a preset temperature, namely the temperature of each zone reaches 260 ℃ (a charging zone) -265 ℃ -270 ℃ (a transition zone) -270 ℃ (an opening zone), waiting for 3-5 min, starting a device (a wind removing knife), GPPS (general purpose polystyrene) is melted, when the melt is extruded stably by the screw extruder, the wind knife is started, the melt is cooled by the wind knife, then is stretched by a casting roller, passes through a high temperature roller and is pulled by a traction roller, and finally is wound to form a film to obtain a polystyrene film; wherein the temperature of an extrusion opening film of the screw extruder is 260-270 ℃, and the ratio of the melt at the screw extrusion opening film speed to the casting roll linear speed is 1: 20, the air knife is arranged between the extrusion port film and the casting roller, the included angle formed by the air port direction of the air knife and the surface of the melt is 75 degrees, the distance between the extrusion port film and the casting roller is 150mm, and the blowing amount of the air knife is 150m3Min, the blowing temperature of an air knife is 10 ℃, the roll temperature of a casting roll is 40 ℃, the temperature of a high-temperature roll is 25 ℃, and the linear speed ratio of a traction roll to the high-temperature roll is 1: 1.5.
the comparative example prepared a polystyrene film having a thickness of 130. + -.2 μm and an average elongation at break of 3%, which was thicker than the polystyrene film having an elongation at break of 69% prepared in example 1, and showed brittleness and rigidity inherent to polystyrene.
Comparative example 4
In the embodiment, GPPS (general purpose polystyrene) with a melt index of 1.5g/10min is put into a screw extruder after the temperature of the screw extruder reaches a preset temperature, namely the temperature of each zone reaches 260 ℃ (a feeding zone) -265 ℃ -270 ℃ (a transition zone) -270 ℃ (a film opening zone), waiting for 3-5 min, starting a device (a wind removing knife), melting the GPPS (general purpose polystyrene), starting the wind knife when a melt is extruded from the screw extruder to be stable, cooling the melt by the wind knife, stretching by a casting roller, passing through a high-temperature roller, drawing by a drawing roller, and finally winding to form a film to obtain a polystyrene film; wherein the temperature of an extrusion opening film of the screw extruder is 260-270 ℃, and the ratio of the melt at the screw extrusion opening film speed to the casting roll linear speed is 1: 20, the air knife is arranged between the extrusion port film and the casting roller, the included angle formed by the air port direction of the air knife and the surface of the melt is 75 degrees, the distance between the extrusion port film and the casting roller is 150mm, and the blowing amount of the air knife is 150m3Min, the blowing temperature of an air knife is 10 ℃, the roll temperature of a casting roll is 40 ℃, the temperature of a high-temperature roll is 90 ℃, and the linear speed ratio of a traction roll to the high-temperature roll is 1: 5.
the polystyrene film prepared in this comparative example was easily adhered to a high temperature roll, and the finished product had poor uniformity, surface smoothness and transparency, and exhibited the original brittleness and rigidity of polystyrene, as compared to the polystyrene film prepared in example 1.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The preparation method of the high-strength high-toughness polystyrene film is characterized by comprising the following steps of:
melting polystyrene in an extruder to obtain a melt, extruding the melt by the extruder, cooling and shaping by an air knife, stretching by a casting roll, passing through a high-temperature roll, and drawing by a drawing roll, and finally winding to form a film to obtain the high-strength high-toughness polystyrene film;
wherein the temperature of an extrusion opening film of the extruder is 220-280 ℃, and the ratio of the melt to the film extrusion speed and the linear speed of a casting roller is 1: (20-65), the air knife is arranged between the extrusion port film and the casting roll, an included angle formed by the air port direction of the air knife and the surface of the melt is 45-90 degrees, the temperature of the high-temperature roll is 25-90 degrees, and the linear velocity ratio of the traction roll to the high-temperature roll is 1: (1.5-5).
2. The method of claim 1, wherein the temperature of the extrusion die film is 250 ℃ to 280 ℃, and the ratio of the melt speed at the extrusion die to the casting roll line speed is 1: (50-70), wherein the linear speed ratio of the high-temperature roller to the drawing roller is 1: (2-3).
3. The manufacturing method according to claim 1, wherein the blast volume of the air knife is 50m3/min～250m3Min; the blast temperature of the air knife is 0-100 ℃.
4. The preparation method according to claim 1, wherein the air knife is cooled by being attached to a roller, and the air blowing temperature of the air knife is 0 ℃ to 80 ℃.
5. The production method according to claim 1, wherein a distance between the extrusion port film and the casting roll is 100mm to 300 mm; the roll temperature of the casting roll is 0-115 ℃.
6. The production method according to claim 1, wherein a distance between the extrusion port film and the casting roll is 150mm to 250mm, and a roll temperature of the casting roll is 25 ℃ to 80 ℃.
7. The method according to claim 1, wherein the polystyrene has a melt index of 1.5g/10min to 5g/10min, and the test condition is a 2.5kg load test at 200 ℃.
8. The method of claim 1, wherein the temperature of the extruder is set to 260 ℃ (feed zone) -265 ℃ -270 ℃ (transition zone) -270 ℃ (vent zone).
9. A high-strength high-toughness polystyrene thin film, which is prepared by the preparation method as claimed in any one of claims 1 to 8.
10. The high-strength high-toughness polystyrene film according to claim 9, wherein said high-strength high-toughness polystyrene film has an elongation at break of 40% to 70%.
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