阅读说明：本技术 一种etfe耐高温隔离膜及其制备方法和应用 (ETFE high-temperature-resistant isolating membrane and preparation method and application thereof ) 是由 胡仲杰 王兆光 岑婵芳 刘杰 于 2021-08-05 设计创作，主要内容包括：本发明提供一种ETFE耐高温隔离膜及其制备方法和应用,所述制备方法包括以下步骤：(1)原料配制；(2)熔融挤出；(3)坯料冷却；(4)冷却定型；(5)后处理。本发明的ETFE耐高温隔离膜的制备方法过程简单,易于操作,产品质量易于控制,成本低,制备出来的隔离膜厚度均匀,表面光泽度好,拉伸性能优异,可以一次性从固化后的复合材料表面剥离,无扯烂或残留。本发明制备的ETFE耐高温隔离膜可用作玻纤/碳纤复合材料成型制作过程中的隔离膜。(The invention provides an ETFE high-temperature resistant isolating membrane and a preparation method and application thereof, wherein the preparation method comprises the following steps: (1) preparing raw materials; (2) melt extrusion; (3) cooling the blank; (4) cooling and shaping; (5) and (5) post-treatment. The preparation method of the ETFE high-temperature resistant isolating membrane has the advantages of simple process, easy operation, easy control of product quality, low cost, uniform thickness of the prepared isolating membrane, good surface gloss and excellent tensile property, can be peeled from the surface of the cured composite material at one time, and has no tear or residue. The ETFE high-temperature resistant isolating membrane prepared by the invention can be used as an isolating membrane in the forming and manufacturing process of a glass fiber/carbon fiber composite material.)

1. The preparation method of the ETFE high-temperature-resistant isolating membrane is characterized by comprising the following steps of:

(1) preparation of raw materials

Premixing ETFE resin with color master batch and processing aid to obtain a raw material;

(2) melt extrusion

Adding the raw material obtained in the step (1) into an extruder for melting, extruding the raw material by a T-shaped die head of a casting machine, uniformly blowing the raw material by an air knife and attaching the raw material to a casting cooling roller to obtain an extruded blank film, wherein the melting temperature is 300-350 ℃, the lip gap of the die head is 0.02-0.07 mm, the extrusion temperature of the die head is 300-350 ℃, the air pressure of the air knife is 0.2-0.7 MPa, and the distance between the air outlet of the air knife and the cooling roller is 15-70 mm;

(3) cooling the extruded blank film obtained in the step (2) to obtain a rough blank;

(4) cooling and shaping

Shaping the rough blank obtained in the step (3) through a cooling roller to obtain an isolation film blank, wherein the cooling roller is cooled by introducing heat conduction oil, and the temperature of the cooling roller is controlled to be 90-150 ℃;

(5) and (4) carrying out post-treatment on the isolation film blank obtained in the step (4) to obtain the ETFE high-temperature-resistant isolation film.

2. The preparation method according to claim 1, wherein the ETFE resin in the step (1) accounts for 70-99%, the color masterbatch accounts for 0.5-10%, and the processing aid accounts for 0.5-20% of the raw material by mass of 100%;

preferably, the melt index of the ETFE resin under the condition of 335 ℃/5kg is 5-15 g/10 min.

3. The production method according to claim 1 or 2, wherein the cooling in step (3) is cooling by a cooling roll;

preferably, the clearance between the cooling roller and the T-shaped die head is 15-70 mm;

preferably, the rotating speed of the cooling roller is 15-35 m/min.

4. The method for preparing according to any one of claims 1 to 3, wherein the post-treatment of step (5) comprises pulling flattening and edge cutting rolling.

5. The method for preparing according to claim 4, wherein the traction flattening comprises the following steps: and casting the isolating film blank through a die head, and cooling the isolating film blank through a cooling roller to obtain an isolating film semi-finished product, wherein the temperature of the cooling roller is 90-150 ℃.

6. The method according to claim 4 or 5, wherein the take-up speed is 15 to 35 m/min.

7. The preparation method according to any one of claims 1 to 6, wherein the thickness of the ETFE high-temperature resistant isolating membrane in the step (5) is 15 to 50 μm.

8. The ETFE high-temperature resistant isolating membrane prepared by the preparation method of any one of claims 1 to 7.

9. The use of the ETFE high temperature resistant barrier film of claim 8 in a composite molding process.

10. Use according to claim 9, wherein the composite material comprises a glass fibre composite or a carbon fibre composite.

Technical Field

The invention belongs to the field of isolating membranes for composite materials, and relates to an ETFE high-temperature-resistant isolating membrane, and a preparation method and application thereof.

Background

ETFE is an abbreviation of english Ethylene-tetrafluoroethylene copolymer, which is called Ethylene-tetrafluoroethylene copolymer (ETFE) in chinese, commonly known as fluoroplastic resin, and is a colorless, transparent granular crystal prepared by copolymerizing tetrafluoroethylene and Ethylene in a certain ratio, and has excellent wear resistance, high temperature resistance, chemical resistance and electrical insulation properties.

The traditional ETFE isolating membrane production process comprises the steps of die pressing and sintering of a blank, cutting and membrane forming by a machine tool, and rolling, and has the advantages of multiple production processes, difficulty in process control, low yield and incapability of meeting the production requirements of the modern society. With the wide application of the composite material in the fields of aerospace, automobile manufacturing and the like, the market demand for the high-temperature-resistant ETFE isolating membrane is also sharply increased.

CN103660108A discloses a tape casting production process of a PTFE high-temperature resistant isolating membrane, which comprises the following steps: (1) preparing raw materials; (2) extruding raw materials; (3) cooling the blank; (4) cooling and shaping; (5) drawing and flattening; (6) trimming and winding; (7) and (6) inspecting and packaging. The invention has the beneficial effects that: the method has the advantages of simple process, easy operation, easy control of product quality and low cost, and the prepared film has uniform thickness, good surface gloss, equivalent tensile strength in all directions and good tear resistance, can be peeled from the surface of the cured composite material at one time, and has no tear or residue. However, the tensile strength performance and the tear resistance performance of the PTFE high-temperature resistant isolating membrane are not given in the invention.

Therefore, in the art, it is desirable to develop a production process that rapidly produces an ETFE barrier film.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide an ETFE high-temperature-resistant isolating membrane and a preparation method and application thereof. The preparation method has the advantages of simple process, easy operation, easy control of product quality and low cost.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the present invention provides a preparation method of an ETFE high temperature resistant barrier film, comprising the following steps:

(1) preparation of raw materials

Premixing ETFE resin with color master batch and processing aid to obtain a raw material;

(2) melt extrusion

Melting the raw material obtained in the step (1) in an extruder, extruding the molten raw material from a T-die head of a casting machine, uniformly blowing the molten raw material by an air knife and attaching the molten raw material to a casting cooling roller to obtain an extruded blank film, wherein the melting temperature is 300-350 ℃ (such as 300 ℃, 310 ℃, 320 ℃, 330 ℃, 340 ℃ or 350 ℃ and the like), the die lip gap is 0.02-0.07 mm (such as 0.02, 0.03, 0.04, 0.05, 0.06 or 0.07mm and the like), the die extrusion temperature is 300-350 ℃ (such as 300 ℃, 310 ℃, 320 ℃, 330 ℃, 340 ℃ or 350 ℃ and the like), the air pressure of the air knife is 0.2-0.7 MPa (such as 0.2, 0.3, 0.5 or 0.7MPa and the like), and the distance between the air outlet of the air knife and the cooling roller is 15-70 mm (such as 15mm, 20mm, 30mm, 40mm, 50mm, 60mm or 70mm and the like);

(3) cooling the extruded blank film obtained in the step (2) to obtain a rough blank;

(4) cooling and shaping

Shaping the rough blank obtained in the step (3) by a cooling roller to obtain an isolation film blank, wherein the cooling roller is cooled by introducing heat conduction oil, and the temperature of the cooling roller is controlled to be 90-150 ℃, such as 90 ℃, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃ or 150 ℃ after passing through a heat exchanger in the cooling roller;

(5) and (4) carrying out post-treatment on the isolation film blank obtained in the step (4) to obtain the ETFE high-temperature-resistant isolation film.

In the invention, the preparation method of the ETFE high-temperature resistant isolating membrane has the advantages of simple process, easy operation, easy control of product quality, low cost, uniform thickness of the prepared isolating membrane, good surface gloss, equivalent tensile strength in all directions and good tear resistance, can be peeled from the surface of the cured composite material at one time, and has no tear or residue.

In the melting and extruding process in the step (2), the temperature of the die head mainly determines the melt flow property, the die lip gap influences the flow rate of fluid extruded from the die head, so that the film thickness is influenced, if the die lip gap is smaller than 0.02mm, the ETFE film is easy to wrinkle, if the die lip gap is larger than 0.07mm, the fluid flow is too large, the ETFE film is too large in thickness, and the final film property is influenced because the ETFE film is not easy to stretch to the required thickness subsequently.

In the invention, in the cooling and shaping process in the step (4), the temperature of the cooling roller is controlled to be 90-150 ℃, so that the film can be subjected to gradient cooling and shaping, the film structure and the film surface are more excellent, if the temperature of the cooling roller is lower than 90 ℃, the film structure is not easy to establish in a quenching state, continuous stripes and other phenomena appear on the surface, the performance of the film is influenced, if the temperature of the cooling roller is higher than 150 ℃, the film is not fully cooled, and the subsequent section is easy to stretch and the like, so that the transparency, the stretching strength and the film width of the film are influenced.

Preferably, the content of the ETFE resin in step (1) is 70% to 99% (e.g., 70%, 75%, 80%, 85%, 90%, 95%, or 99%, etc.), the content of the color masterbatch is 0.5% to 10% (e.g., 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%, etc.), and the content of the processing aid is 0.5% to 20%, e.g., 0.5%, 1%, 5%, 10%, 15%, 18%, or 20%, etc., based on 100% by mass of the raw material.

Preferably, the melt index of the ETFE resin under the condition of 335 ℃/5kg is 5-15 g/10min, such as 5g/10min, 8g/10min, 10g/10min, 13g/10min or 15g/10 min.

Preferably, the processing aid comprises a reinforcing agent and/or a lubricant.

Preferably, the cooling in step (3) is cooling by cooling rollers.

Preferably, the gap between the cooling roll and the T-die is 15mm to 70mm, such as 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, or the like.

Preferably, the rotating speed of the cooling roller is 15-35 m/min, such as 15m/min, 20m/min, 25m/min, 30m/min or 35 m/min.

Preferably, the post-treatment of the step (5) comprises traction flattening and trimming rolling.

Preferably, the traction flattening comprises the following steps: and casting the isolating film blank through a die head, and cooling the isolating film blank through a cooling roller to obtain an isolating film semi-finished product, wherein the temperature of the cooling roller is 90-150 ℃, such as 90 ℃, 95 ℃, 100 ℃, 105 ℃, 110 ℃, 115 ℃, 120 ℃, 125 ℃, 130 ℃, 135 ℃, 140 ℃, 145 ℃ or 150 ℃ and the like.

Preferably, the rolling speed is 15-35 m/min, such as 15m/min, 20m/min, 30m/min or 35 m/min.

Preferably, the inspection package is further included after the trimming roll is rolled.

Preferably, the thickness of the ETFE high temperature resistant separation film in the step (5) is 15 μm to 50 μm, such as 15 μm, 20 μm, 30 μm, 40 μm or 50 μm.

In a second aspect, the invention provides an ETFE high-temperature resistant separation film prepared according to the preparation method of the first aspect.

In a third aspect, the invention provides an application of the ETFE high-temperature resistant barrier film of the second aspect in a composite material molding manufacturing process.

Preferably, the composite material comprises a glass fibre composite or a carbon fibre composite.

Compared with the prior art, the invention has the following beneficial effects:

the preparation method of the ETFE high-temperature resistant isolating membrane has the advantages of simple process, easy operation, easy control of product quality, low cost, uniform thickness of the prepared isolating membrane, good surface gloss, excellent tensile strength (longitudinal: 50-77MPa, transverse: 30-59MPa) and excellent elongation at break (longitudinal: 180-240%, transverse: 210-310%), can be peeled from the surface of the cured composite material at one time, and has no fester or residue. The ETFE high-temperature resistant isolating membrane prepared by the invention can be used as an isolating membrane in the forming and manufacturing process of a glass fiber/carbon fiber composite material.

Drawings

FIG. 1 is a flow chart of a method for preparing an ETFE high-temperature resistant isolating membrane in the embodiment of the invention.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

Example 1

In this embodiment, a preparation method of an ETFE high-temperature resistant separation film is provided, where the preparation method includes the following steps:

(1) preparation of raw materials

Premixing ETFE resin with color master batch and processing aid to obtain a raw material;

(2) melt extrusion

Adding the raw material obtained in the step (1) into an extruder for melting, extruding the raw material by a T-shaped die head of a casting machine, uniformly blowing the raw material by an air knife and attaching the raw material to a casting cooling roller to obtain an extruded blank film, wherein the melting temperature is 300 ℃, the lip gap of the die head is 0.02mm, the extrusion temperature of the die head is 300 ℃, the air pressure of the air knife is 0.7MPa, and the distance between the air outlet of the air knife and the cooling roller is 15 mm;

(3) blank cooling

Cooling the extruded blank film obtained in the step (2) by a cooling roller to obtain a rough blank, wherein the gap between the cooling roller and the T-shaped die head is 15mm, and the rotating speed of the cooling roller is 15 m/min;

(4) cooling and shaping

Shaping the rough blank obtained in the step (3) through a cooling roller to obtain an isolation film blank, wherein the cooling roller is cooled by introducing heat conduction oil, and the temperature of the cooling roller is controlled at 90 ℃ after the rough blank passes through a cold-heat exchanger in the cooling roller;

(5) traction flattening

Casting the isolating film blank obtained in the step (4) through a die head, and cooling the isolating film blank through a cooling roller to obtain an isolating film semi-finished product, wherein the temperature of the cooling roller is 90 ℃;

(6) trimming and rolling

Trimming and winding the semi-finished product of the isolating membrane obtained in the step (5) to obtain a finished product of the isolating membrane, wherein the winding speed is 15 m/min;

(7) inspection package

And (4) inspecting and packaging the finished product of the isolating membrane obtained in the step (6) to obtain the ETFE high-temperature-resistant isolating membrane, wherein the thickness of the ETFE high-temperature-resistant isolating membrane is 15 mu m.

Wherein, by taking the mass of the raw materials as 100%, the content of the ETFE resin in the step (1) is 70%, the content of the color master batch is 10%, and the content of the processing aid is 20%; the melt index of the ETFE resin under the condition of 335 ℃/5kg is 5g/10min, and the processing aid is a reinforcing agent.

The flow chart of the preparation method of the ETFE high-temperature resistant separation film in this example is shown in fig. 1.

Example 2

In this embodiment, a preparation method of an ETFE high-temperature resistant separation film is provided, where the preparation method includes the following steps:

(1) preparation of raw materials

Premixing ETFE resin with color master batch and processing aid to obtain a raw material;

(2) melt extrusion

Adding the raw material obtained in the step (1) into an extruder for melting, extruding the raw material by a T-shaped die head of a casting machine, uniformly blowing the raw material by an air knife and attaching the raw material to a casting cooling roller to obtain an extruded blank film, wherein the melting temperature is 350 ℃, the lip gap of the die head is 0.07mm, the extrusion temperature of the die head is 350 ℃, the air pressure of the air knife is 0.2MPa, and the distance between the air outlet of the air knife and the cooling roller is 70 mm;

(3) blank cooling

Cooling the extruded blank film obtained in the step (2) by a cooling roller to obtain a rough blank, wherein the gap between the cooling roller and the T-shaped die head is 70mm, and the rotating speed of the cooling roller is 35 m/min;

(4) cooling and shaping

Shaping the rough blank obtained in the step (3) through a cooling roller to obtain an isolation film blank, wherein the cooling roller is cooled by introducing heat conduction oil, and the temperature of the cooling roller is controlled at 150 ℃ after the rough blank passes through a cold-heat exchanger in the cooling roller;

(5) traction flattening

Casting the isolating film blank obtained in the step (4) through a die head, and cooling the isolating film blank through a cooling roller to obtain an isolating film semi-finished product, wherein the temperature of the cooling roller is 150 ℃;

(6) trimming and rolling

Trimming and winding the semi-finished product of the isolating membrane obtained in the step (5) to obtain a finished product of the isolating membrane, wherein the winding speed is 35 m/min;

(7) inspection package

And (4) inspecting and packaging the finished product of the isolating membrane obtained in the step (6) to obtain the ETFE high-temperature-resistant isolating membrane, wherein the thickness of the ETFE high-temperature-resistant isolating membrane is 50 microns.

Wherein, by taking the mass of the raw materials as 100%, the content of the ETFE resin in the step (1) is 99%, the content of the color master batch is 0.5%, and the content of the processing aid is 0.5%; the melt index of the ETFE resin under the condition of 335 ℃/5kg is 15g/10min, and the processing aid is a lubricant.

The flow chart of the preparation method of the ETFE high-temperature resistant separation film in this example is shown in fig. 1.

Example 3

In this embodiment, a preparation method of an ETFE high-temperature resistant separation film is provided, where the preparation method includes the following steps:

(1) preparation of raw materials

Premixing ETFE resin with color master batch and processing aid to obtain a raw material;

(2) melt extrusion

Adding the raw material obtained in the step (1) into an extruder for melting, extruding the raw material by a T-shaped die head of a casting machine, uniformly blowing the raw material by an air knife and attaching the raw material to a casting cooling roller to obtain an extruded blank film, wherein the melting temperature is 340 ℃, the lip gap of the die head is 0.05mm, the extrusion temperature of the die head is 340 ℃, the air pressure of the air knife is 0.5MPa, and the distance between the air outlet of the air knife and the cooling roller is 20 mm;

(3) blank cooling

Cooling the extruded blank film obtained in the step (2) by a cooling roller to obtain a rough blank, wherein the gap between the cooling roller and the T-shaped die head is 20mm, and the rotating speed of the cooling roller is 25 m/min;

(4) cooling and shaping

Shaping the rough blank obtained in the step (3) through a cooling roller to obtain an isolation film blank, wherein the cooling roller is cooled by introducing heat conduction oil, and the temperature of the cooling roller is controlled at 120 ℃ after the rough blank passes through a cold-heat exchanger in the cooling roller;

(5) traction flattening

Casting the isolating film blank obtained in the step (4) through a die head, and cooling the isolating film blank through a cooling roller to obtain an isolating film semi-finished product, wherein the temperature of the cooling roller is 110 ℃;

(6) trimming and rolling

Trimming and winding the semi-finished product of the isolating membrane obtained in the step (5) to obtain a finished product of the isolating membrane, wherein the winding speed is 25 m/min;

(7) inspection package

And (4) inspecting and packaging the finished product of the isolating membrane obtained in the step (6) to obtain the ETFE high-temperature-resistant isolating membrane, wherein the thickness of the ETFE high-temperature-resistant isolating membrane is 35 mu m.

Wherein, by taking the mass of the raw materials as 100%, the content of the ETFE resin in the step (1) is 80%, the content of the color master batch is 1%, and the content of the processing aid is 19%; the melt index of the ETFE resin under the condition of 335 ℃/5kg is 8g/10min, and the processing aid is a reinforcing agent.

The flow chart of the preparation method of the ETFE high-temperature resistant separation film in this example is shown in fig. 1.

Example 4

In this embodiment, a preparation method of an ETFE high-temperature resistant separation film is provided, where the preparation method includes the following steps:

(1) preparation of raw materials

Premixing ETFE resin with color master batch and processing aid to obtain a raw material;

(2) melt extrusion

Adding the raw material obtained in the step (1) into an extruder for melting, extruding the raw material by a T-shaped die head of a casting machine, uniformly blowing the raw material by an air knife and attaching the raw material to a casting cooling roller to obtain an extruded blank film, wherein the melting temperature is 330 ℃, the lip gap of the die head is 0.03mm, the extrusion temperature of the die head is 330 ℃, the air pressure of the air knife is 0.6MPa, and the distance between the air outlet of the air knife and the cooling roller is 30 mm;

(3) blank cooling

Cooling the extruded blank film obtained in the step (2) by a cooling roller to obtain a rough blank, wherein the gap between the cooling roller and the T-shaped die head is 30mm, and the rotating speed of the cooling roller is 20 m/min;

(4) cooling and shaping

Shaping the rough blank obtained in the step (3) through a cooling roller to obtain an isolation film blank, wherein the cooling roller is cooled by introducing heat conduction oil, and the temperature of the cooling roller is controlled at 140 ℃ after the rough blank passes through a cold-heat exchanger in the cooling roller;

(5) traction flattening

Casting the isolating film blank obtained in the step (4) through a die head, and cooling the isolating film blank through a cooling roller to obtain an isolating film semi-finished product, wherein the temperature of the cooling roller is 120 ℃;

(6) trimming and rolling

Trimming and winding the semi-finished product of the isolating membrane obtained in the step (5) to obtain a finished product of the isolating membrane, wherein the winding speed is 20 m/min;

(7) inspection package

And (4) inspecting and packaging the finished product of the isolating membrane obtained in the step (6) to obtain the ETFE high-temperature-resistant isolating membrane, wherein the thickness of the ETFE high-temperature-resistant isolating membrane is 20 microns.

Wherein, by taking the mass of the raw materials as 100%, the content of the ETFE resin in the step (1) is 85%, the content of the color master batch is 5%, and the content of the processing aid is 10%; the melt index of the ETFE resin under the condition of 335 ℃/5kg is 10g/10min, and the processing aid is a lubricant.

The flow chart of the preparation method of the ETFE high-temperature resistant separation film in this example is shown in fig. 1.

Example 5

In this embodiment, a preparation method of an ETFE high-temperature resistant separation film is provided, where the preparation method includes the following steps:

(1) preparation of raw materials

Premixing ETFE resin with color master batch and processing aid to obtain a raw material;

(2) melt extrusion

Adding the raw material obtained in the step (1) into an extruder for melting, extruding the raw material by a T-shaped die head of a casting machine, uniformly blowing the raw material by an air knife and attaching the raw material to a casting cooling roller to obtain an extruded blank film, wherein the melting temperature is 310 ℃, the lip gap of the die head is 0.06mm, the extrusion temperature of the die head is 310 ℃, the air pressure of the air knife is 0.4MPa, and the distance between the air outlet of the air knife and the cooling roller is 50 mm;

(3) blank cooling

Cooling the extruded blank film obtained in the step (2) by a cooling roller to obtain a rough blank, wherein the gap between the cooling roller and the T-shaped die head is 40mm, and the rotating speed of the cooling roller is 30 m/min;

(4) cooling and shaping

Shaping the rough blank obtained in the step (3) through a cooling roller to obtain an isolation film blank, wherein the cooling roller is cooled by introducing heat conduction oil, and the temperature of the cooling roller is controlled at 110 ℃ after the rough blank passes through a heat exchanger in the cooling roller;

(5) traction flattening

Casting the isolating film blank obtained in the step (4) through a die head, and cooling the isolating film blank through a cooling roller to obtain an isolating film semi-finished product, wherein the temperature of the cooling roller is 130 ℃;

(6) trimming and rolling

Trimming and winding the semi-finished product of the isolating membrane obtained in the step (5) to obtain a finished product of the isolating membrane, wherein the winding speed is 30 m/min;

(7) inspection package

And (4) inspecting and packaging the finished product of the isolating membrane obtained in the step (6) to obtain the ETFE high-temperature-resistant isolating membrane, wherein the thickness of the ETFE high-temperature-resistant isolating membrane is 45 microns.

Wherein, by taking the mass of the raw materials as 100%, the content of the ETFE resin in the step (1) is 90%, the content of the color master batch is 3%, and the content of the processing aid is 7%; the melt index of the ETFE resin under the condition of 335 ℃/5kg is 13g/10min, and the processing aid is a reinforcing agent.

The flow chart of the preparation method of the ETFE high-temperature resistant separation film in this example is shown in fig. 1.

Example 6

In this embodiment, a preparation method of an ETFE high-temperature resistant separation film is provided, where the preparation method includes the following steps:

(1) preparation of raw materials

Premixing ETFE resin with color master batch and processing aid to obtain a raw material;

(2) melt extrusion

Adding the raw material obtained in the step (1) into an extruder for melting, extruding the raw material by a T-shaped die head of a casting machine, uniformly blowing the raw material by an air knife and attaching the raw material to a casting cooling roller to obtain an extruded blank film, wherein the melting temperature is 320 ℃, the lip gap of the die head is 0.05mm, the extrusion temperature of the die head is 320 ℃, the air pressure of the air knife is 0.5MPa, and the distance between the air outlet of the air knife and the cooling roller is 60 mm;

(3) blank cooling

Cooling the extruded blank film obtained in the step (2) by a cooling roller to obtain a rough blank, wherein the gap between the cooling roller and the T-shaped die head is 50mm, and the rotating speed of the cooling roller is 30 m/min;

(4) cooling and shaping

Shaping the rough blank obtained in the step (3) through a cooling roller to obtain an isolation film blank, wherein the cooling roller is cooled by introducing heat conduction oil, and the temperature of the cooling roller is controlled at 130 ℃ after the rough blank passes through a heat exchanger in the cooling roller;

(5) traction flattening

Casting the isolating film blank obtained in the step (4) through a die head, and cooling the isolating film blank through a cooling roller to obtain an isolating film semi-finished product, wherein the temperature of the cooling roller is 140 ℃;

(6) trimming and rolling

Trimming and winding the semi-finished product of the isolating membrane obtained in the step (5) to obtain a finished product of the isolating membrane, wherein the winding speed is 30 m/min;

(7) inspection package

And (4) inspecting and packaging the finished product of the isolating membrane obtained in the step (6) to obtain the ETFE high-temperature-resistant isolating membrane, wherein the thickness of the ETFE high-temperature-resistant isolating membrane is 40 mu m.

Wherein, by taking the mass of the raw materials as 100%, the content of the ETFE resin in the step (1) is 91%, the content of the color master batch is 8%, and the content of the processing aid is 1%; the melt index of the ETFE resin under the condition of 335 ℃/5kg is 10g/10min, and the processing aid is a lubricant.

The flow chart of the preparation method of the ETFE high-temperature resistant separation film in this example is shown in fig. 1.

Comparative example 1

This comparative example is different from example 1 only in that the die lip gap during melt extrusion in step (2) was 0.01mm, and the other conditions were the same as example 1.

Comparative example 2

This comparative example is different from example 1 only in that the die lip gap during melt extrusion in step (2) was 0.1mm, and the other conditions were the same as example 1.

Comparative example 3

The comparative example is different from example 1 only in that the temperature of the cooling roller in the cooling and setting process of step (4) is controlled at 80 ℃, and other conditions are the same as example 1.

Comparative example 4

The comparative example is different from example 1 only in that the temperature of the cooling roller in the cooling and setting process of step (4) is controlled at 160 ℃, and other conditions are the same as example 1.

The ETFE high-temperature resistant isolating membranes prepared in examples 1-6 and comparative examples 1-4 are subjected to performance tests, and the test method is as follows:

(1) tensile property: testing was performed according to ASTM D882-10;

(2) thickness: the test was carried out using a thickness gauge according to the method of GB/T6672.

The results of the performance tests are shown in table 1.

TABLE 1

As can be seen from Table 1, the ETFE high temperature resistant separators prepared in examples 1-6 have suitable thickness (15-50 μm) and excellent tensile strength (machine direction: 50-77MPa, transverse direction: 30-59MPa) and elongation at break (machine direction: 180% -240%, transverse direction: 210% -310%).

Compared with the example 1, the ETFE prepared in the comparative example 1 has smaller thickness of the high-temperature resistant isolation film, and the tensile strength and the elongation at break are both obviously reduced, because the film is too thin, easy to tear and difficult to form due to the small clearance of the lip opening of the die head in the melt extrusion process of the step (2) in the comparative example 1; the ETFE high temperature barrier film prepared in comparative example 2 is not suitable for a scene desired by a customer because of its excessive thickness, although its tensile property is improved.

Compared with example 1, the thickness of the ETFE high-temperature resistant isolating film prepared in comparative example 3 is not changed, but the tensile strength and the elongation at break of the ETFE high-temperature resistant isolating film are slightly reduced, and the thickness of the high-temperature resistant isolating film prepared in comparative example 4 is not changed, although the elongation at break of the ETFE high-temperature resistant isolating film is slightly improved, the tensile strength of the ETFE high-temperature resistant isolating film is slightly reduced.

The applicant states that the present invention is illustrated by the above examples to provide an ETFE high temperature resistant separator, a method for preparing the same, and applications of the same, but the present invention is not limited to the above examples, i.e., the present invention is not limited to the above examples. It will be apparent to those skilled in the art that any modification of the present invention, equivalent substitutions of selected materials and additions of auxiliary components, selection of specific modes and the like, which are within the scope and disclosure of the present invention, are contemplated by the present invention.