An oil-proof PE-based composite material for aprons and a preparation method thereof
By using a combination of low-density polyethylene and specific additives in apron materials, a PE-based composite material with excellent oil resistance and durability was prepared, which solved the shortcomings of apron materials in terms of oil resistance and durability, and achieved a long-lasting oil-resistant effect during friction and cleaning processes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WEIFANG ENG VOCATIONAL COLLEGE
- Filing Date
- 2026-04-02
- Publication Date
- 2026-05-29
AI Technical Summary
Existing apron materials are insufficient in terms of oil resistance and durability, especially during frequent use and washing, they are prone to oil stain adhesion, interlayer peeling, and shortened service life.
Using low-density polyethylene as the base material, combined with magnesium fluoride/ETFE melt-mixed material, nano-calcium carbonate, zinc stearate, antioxidant, titanate coupling agent and polytetrafluoroethylene micro powder, etc., an oil-resistant PE-based composite material is prepared through a specific mixing and extrusion process to form a dense structure to improve oil resistance and durability.
The prepared PE-based composite material exhibits excellent oil resistance and durability, with an oil contact angle of 135-141°. It remains in good condition after rubbing and washing, with low oil adhesion and strong durability.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of polymer materials technology, specifically to an oil-resistant PE-based composite material for aprons and its preparation method. Background Technology
[0002] Aprons are commonly used protective gear in home kitchens, catering services, and food processing. Their core function is to effectively prevent oil stains from adhering and withstand wear and tear from friction and washing over long-term use. Currently, apron materials on the market are mainly divided into natural fiber aprons and traditional synthetic materials (such as ordinary PE and PVC coated fabrics). However, both types of materials have obvious performance defects: natural fiber aprons easily absorb oil stains, are difficult to clean and remove, and are prone to fiber wear and dimensional deformation after repeated washing, resulting in a significant reduction in their oil-resistant ability and service life; ordinary PE aprons lack durability and are prone to cracking and damage with frequent wear, while PVC coated aprons are prone to peeling off after repeated washing, losing their oil-resistant function.
[0003] Prior art with publication number CN116640342B discloses a low-oil-permeability PP / PE composite material, its preparation method, and its application. It primarily achieves excellent hydrophobic, oleophobic, and abrasion-resistant properties through a hydrophobic and oleophobic outer layer. However, it is not designed for wearable protective scenarios such as aprons, requiring vigorous cleaning after oil stains adhere, which does not meet the needs of apron use. Furthermore, the perfluorinated components pose a potential migration risk, resulting in insufficient safety upon contact with the human body. Prior art with publication number CN119820962A discloses a PE film and its preparation method. It mainly utilizes the macromolecular chains of modified chitosan in the oleophobic and antibacterial layer to form a dense structure with PE resin to block oil penetration. However, the interlayer bonding strength of the three-layer co-extruded structure is only suitable for static packaging. Repeated washing of aprons easily leads to interlayer peeling, causing the oleophobic and antibacterial layer to fail, and its durability cannot meet the needs of frequent cleaning.
[0004] In summary, although the existing technical solutions have improved certain properties of PE-based materials to some extent, the following technical problems still exist in the field of apron use: poor oil stain resistance and insufficient durability. Summary of the Invention
[0005] In order to solve the above-mentioned problems in the prior art, the present invention provides an oil-resistant PE-based composite material for aprons and its preparation method, and achieves the following objective: to prepare a PE composite material with excellent oil-resistant properties and strong durability.
[0006] To achieve the above objectives, the following technical solution is adopted: An oil-resistant PE-based composite material for aprons, comprising, by weight, the following raw materials: 80-90 parts low-density polyethylene, 2-5 parts magnesium fluoride / ETFE melt-mixed material, 10-15 parts nano-calcium carbonate, 0.3-0.8 parts zinc stearate, 0.2-0.5 parts antioxidant, 0.3-0.6 parts titanate coupling agent, 1-2 parts polytetrafluoroethylene micro powder, and 0.1-0.2 parts polyethylene wax.
[0007] The density of the low-density polyethylene is 0.910-0.925 g / cm³. 3 .
[0008] The magnesium fluoride / ETFE melt blend material is prepared by surface modification of magnesium fluoride with γ-aminopropyltriethoxysilane and then melt blending it with ethylene-tetrafluoroethylene copolymer.
[0009] The particle size of the nano-calcium carbonate is 10-100 nm.
[0010] The polytetrafluoroethylene micro powder has a particle size of 1-10 μm.
[0011] The antioxidant used is antioxidant 1010.
[0012] The titanate coupling agent selected is NDZ-101.
[0013] This invention also provides a method for preparing an oil-resistant PE-based composite material for aprons, comprising the following steps: Step 1: Preparation of magnesium fluoride / ETFE melt blend material (1) Magnesium fluoride pretreatment Magnesium fluoride was added to anhydrous ethanol and ultrasonically dispersed. Then, γ-aminopropyltriethoxysilane was added, and the mixture was heated to 60-70℃ with a stirring rate of 300-400 rpm for 3-4 hours. After the reaction was completed, the mixture was centrifuged at 7000-8000 rpm for 10-15 minutes. Then, the mixture was dried at 80-100℃ for 3-4 hours to obtain modified magnesium fluoride.
[0014] The mass ratio of magnesium fluoride to anhydrous ethanol is 1:(5-8).
[0015] The ultrasonic dispersion is performed with an ultrasonic power of 300-500W for 30-60 minutes.
[0016] The amount of γ-aminopropyltriethoxysilane used is 2-3% of the mass of magnesium fluoride.
[0017] (2) Preparation of magnesium fluoride / ETFE melt blend material The ethylene-tetrafluoroethylene copolymer and modified magnesium fluoride were mixed and fed into a twin-screw extruder. The extruder parameters were set as follows: feeding section temperature 240-260℃, compression section temperature 270-280℃, melting section temperature 280-300℃, die head section temperature 270-290℃, screw speed 300-400rpm, and vacuum degree at the die head -0.06 to -0.08MPa. After water cooling curing and pelletizing, magnesium fluoride / ETFE melt blend material was obtained.
[0018] The mass ratio of the ethylene-tetrafluoroethylene copolymer to the modified magnesium fluoride is (5-9):1.
[0019] Step 2: Preparation of premix Dry nano-calcium carbonate is mixed with titanate coupling agent, heated to 60-80℃, and stirred for 10-15 minutes at a speed of 800-1000 rpm to obtain pretreated nano-calcium carbonate; magnesium fluoride / ETFE melt mixture is mixed with polytetrafluoroethylene micro powder, stirred at room temperature for 5-8 minutes at a speed of 1000-1500 rpm to obtain pretreated fluorine-based functional mixed powder.
[0020] Add low-density polyethylene to the mixer, turn on the stirrer, and stir for 3-5 minutes at a speed of 200-300 rpm. Then add pretreated nano-calcium carbonate, zinc stearate, and antioxidant in sequence, and continue stirring for 5-8 minutes. Next, add polyethylene wax and continue stirring for 3-5 minutes. Finally, add pretreated fluorine-based functional mixed powder and stir for 3-5 minutes to obtain the premix.
[0021] Step 3: Obtaining PE-based composite materials The premixed material is added to a single-screw extruder. The temperature settings for the single-screw extruder are as follows: feed section 140-150℃, compression section 200-210℃, melting section 230-240℃, homogenization section 240-250℃, connector section 245-255℃, transition section 250-260℃, and die outlet 255-265℃. After extrusion at the die head, the material is blown into a film with a blow-up ratio of (2-3):1 and a traction speed of 5-8 m / min. Then, it is cooled with a cooling air temperature of 15-20℃ to obtain a PE-based composite material.
[0022] The beneficial effects of this invention are as follows: (1) The PE-based composite material for aprons of the present invention has excellent oil-resistant properties. The prepared PE-based composite material has an oil contact angle of 135-141°; after being immersed in oil for 30 seconds, the amount of oil adhering is 0.05-0.13g.
[0023] (2) The oil-resistant PE-based composite material for aprons of the present invention has excellent durability. After 100 rubs, the prepared PE-based composite material has an oil contact angle of 128-133°; after 10 washes, the oil contact angle is 125-131°. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.
[0025] Example 1: An oil-resistant PE-based composite material for aprons and its preparation method An oil-resistant PE-based composite material for aprons, by weight, comprises: 80 parts low-density polyethylene, 5 parts magnesium fluoride / ETFE melt-mixed material, 15 parts nano-calcium carbonate, 0.8 parts zinc stearate, 0.5 parts antioxidant, 0.6 parts titanate coupling agent, 2 parts polytetrafluoroethylene micro powder, and 0.2 parts polyethylene wax.
[0026] A method for preparing an oil-resistant PE-based composite material for aprons includes the following steps: Step 1: Preparation of magnesium fluoride / ETFE melt blend material (1) Magnesium fluoride pretreatment Magnesium fluoride was added to anhydrous ethanol at a mass ratio of 1:5 and ultrasonically dispersed for 30 min at a power of 500 W. γ-aminopropyltriethoxysilane was added at a mass of 2% of the magnesium fluoride. The mixture was heated to 60 °C and stirred at 300 rpm for 4 h. After the reaction was complete, the mixture was centrifuged at 7000 rpm for 15 min. Then, it was dried at 80 °C for 4 h to obtain modified magnesium fluoride.
[0027] (2) Preparation of magnesium fluoride / ETFE melt blend material Ethylene-tetrafluoroethylene copolymer and modified magnesium fluoride were mixed and fed into a twin-screw extruder. The mass ratio of ethylene-tetrafluoroethylene copolymer to modified magnesium fluoride was 5:1. The extruder parameters were set as follows: feeding section temperature 240℃, compression section temperature 270℃, melting section temperature 280℃, die head section temperature 270℃, screw speed 300 rpm, and vacuum degree at the die head -0.06 MPa. After water cooling curing and pelletizing, magnesium fluoride / ETFE melt-mixed material was obtained.
[0028] Step 2: Preparation of premix Dry nano-calcium carbonate was mixed with titanate coupling agent, heated to 60°C, and stirred for 15 min at 800 rpm to obtain pretreated nano-calcium carbonate; magnesium fluoride / ETFE melt mixture was mixed with polytetrafluoroethylene micro powder, stirred at room temperature for 5 min at 1500 rpm to obtain pretreated fluorine-based functional mixed powder.
[0029] Add low-density polyethylene to a mixer, turn on the mixer, and stir at 200 rpm for 5 minutes. Then add pretreated nano-calcium carbonate, zinc stearate, and antioxidant in sequence, and continue stirring for 8 minutes. Next, add polyethylene wax and continue stirring for 5 minutes. Finally, add pretreated fluorine-based functional mixed powder and stir for 5 minutes to obtain a premix.
[0030] Step 3: Obtaining PE-based composite materials The premixed material was added to the single-screw extruder. The temperatures of each section of the single-screw extruder are shown in Table 1.
[0031] Table 1 After extrusion, the die head is blown into a film with a blow-up ratio of 2:1 and a traction speed of 5m / min. Then it is cooled with a cooling air temperature of 15℃ to obtain a PE-based composite material.
[0032] Example 2: An oil-resistant PE-based composite material for aprons and its preparation method An oil-resistant PE-based composite material for aprons, by weight, comprises: 85 parts low-density polyethylene, 4 parts magnesium fluoride / ETFE melt-mixed material, 12 parts nano-calcium carbonate, 0.5 parts zinc stearate, 0.4 parts antioxidant, 0.4 parts titanate coupling agent, 1.5 parts polytetrafluoroethylene micro powder, and 0.2 parts polyethylene wax.
[0033] A method for preparing an oil-resistant PE-based composite material for aprons includes the following steps: Step 1: Preparation of magnesium fluoride / ETFE melt blend material (1) Magnesium fluoride pretreatment Magnesium fluoride was added to anhydrous ethanol at a mass ratio of 1:6 and ultrasonically dispersed for 45 min at a power of 400 W. γ-aminopropyltriethoxysilane was added at a mass of 3% of the magnesium fluoride mass. The mixture was heated to 70 °C and stirred at 400 rpm for 3 h. After the reaction was complete, the mixture was centrifuged at 8000 rpm for 10 min. Then, it was dried at 90 °C for 4 h to obtain modified magnesium fluoride.
[0034] (2) Preparation of magnesium fluoride / ETFE melt blend material Ethylene-tetrafluoroethylene copolymer and modified magnesium fluoride were mixed and fed into a twin-screw extruder. The mass ratio of ethylene-tetrafluoroethylene copolymer to modified magnesium fluoride was 7:1. The extruder parameters were set as follows: feeding section temperature 250℃, compression section temperature 275℃, melting section temperature 290℃, die head section temperature 280℃, screw speed 400rpm, and vacuum degree at the die head -0.08MPa. After water cooling curing and pelletizing, magnesium fluoride / ETFE melt-mixed material was obtained.
[0035] Step 2: Preparation of premix Dry nano-calcium carbonate was mixed with titanate coupling agent, heated to 70°C, and stirred for 15 min at 1000 rpm to obtain pretreated nano-calcium carbonate; magnesium fluoride / ETFE melt mixture was mixed with polytetrafluoroethylene micro powder, stirred at room temperature for 8 min at 1200 rpm to obtain pretreated fluorine-based functional mixed powder.
[0036] Add low-density polyethylene to a mixer, turn on the mixer, and stir at 300 rpm for 5 minutes. Then add pretreated nano-calcium carbonate, zinc stearate, and antioxidant in sequence, and continue stirring for 8 minutes. Next, add polyethylene wax and continue stirring for 5 minutes. Finally, add pretreated fluorine-based functional mixed powder and stir for 5 minutes to obtain a premix.
[0037] Step 3: Obtaining PE-based composite materials The premixed material was added to the single-screw extruder. The temperatures of each section of the single-screw extruder are shown in Table 2.
[0038] Table 2 After extrusion, the film is blown at a blow ratio of 2.5:1 and a traction speed of 6m / min; then it is cooled at a cooling air temperature of 20℃ to obtain a PE-based composite material.
[0039] Example 3: An oil-resistant PE-based composite material for aprons and its preparation method An oil-resistant PE-based composite material for aprons, by weight, comprises: 90 parts low-density polyethylene, 2 parts magnesium fluoride / ETFE melt-mixed material, 10 parts nano-calcium carbonate, 0.3 parts zinc stearate, 0.2 parts antioxidant, 0.3 parts titanate coupling agent, 1 part polytetrafluoroethylene micro powder, and 0.1 parts polyethylene wax.
[0040] A method for preparing an oil-resistant PE-based composite material for aprons includes the following steps: Step 1: Preparation of magnesium fluoride / ETFE melt blend material (1) Magnesium fluoride pretreatment Magnesium fluoride was added to anhydrous ethanol at a mass ratio of 1:8 and ultrasonically dispersed for 60 min at a power of 300 W. γ-aminopropyltriethoxysilane was added at a mass of 3% of the magnesium fluoride mass. The mixture was heated to 70 °C and stirred at 400 rpm for 3 h. After the reaction was complete, the mixture was centrifuged at 8000 rpm for 10 min and then dried at 100 °C for 3 h to obtain modified magnesium fluoride.
[0041] (2) Preparation of magnesium fluoride / ETFE melt blend material Ethylene-tetrafluoroethylene copolymer and modified magnesium fluoride were mixed and fed into a twin-screw extruder. The mass ratio of ethylene-tetrafluoroethylene copolymer to modified magnesium fluoride was 9:1. The extruder parameters were set as follows: feeding section temperature 260℃, compression section temperature 280℃, melting section temperature 300℃, die head section temperature 290℃, screw speed 400rpm, and vacuum degree at the die head -0.08MPa. After water cooling, curing, and pelletizing, magnesium fluoride / ETFE melt-mixed material was obtained.
[0042] Step 2: Preparation of premix Dry nano-calcium carbonate was mixed with titanate coupling agent, heated to 80°C, and stirred for 10 min at 1000 rpm to obtain pretreated nano-calcium carbonate; magnesium fluoride / ETFE melt mixture was mixed with polytetrafluoroethylene micro powder, stirred at room temperature for 8 min at 1000 rpm to obtain pretreated fluorine-based functional mixed powder.
[0043] Add low-density polyethylene to a mixer, turn on the mixer, and stir at 300 rpm for 3 minutes. Then add pretreated nano-calcium carbonate, zinc stearate, and antioxidant in sequence, and continue stirring for 5 minutes. Next, add polyethylene wax and continue stirring for 3 minutes. Finally, add pretreated fluorine-based functional mixed powder and stir for 3 minutes to obtain a premix.
[0044] Step 3: Obtaining PE-based composite materials The premixed material was added to the single-screw extruder. The temperatures of each section of the single-screw extruder are shown in Table 3.
[0045] Table 3 After extrusion, the die head is blown into a film with a blow-up ratio of 3:1 and a traction speed of 8m / min. Then it is cooled with a cooling air temperature of 20℃ to obtain a PE-based composite material.
[0046] Comparative Example 1 A PE-based composite material, by weight, comprises the following raw materials: 85 parts low-density polyethylene, 12 parts nano-calcium carbonate, 0.5 parts zinc stearate, 0.4 parts antioxidant, 0.4 parts titanate coupling agent, 1.5 parts polytetrafluoroethylene micro powder, and 0.2 parts polyethylene wax.
[0047] A method for preparing a PE-based composite material includes the following steps: Step 1: Preparation of premix Dry nano-calcium carbonate was mixed with a titanate coupling agent, heated to 70°C, and stirred for 15 minutes at a speed of 1000 rpm to obtain pretreated nano-calcium carbonate. Add low-density polyethylene to a mixer, turn on the mixer, and stir at 300 rpm for 5 minutes. Then add pretreated nano-calcium carbonate, zinc stearate, and antioxidant in sequence, and continue stirring for 8 minutes. Next, add polyethylene wax and continue stirring for 5 minutes. Finally, add polytetrafluoroethylene micro powder and stir for 5 minutes to obtain a premix.
[0048] Step 3: Obtaining PE-based composite materials This step is the same as the step in Example 2, “Preparation of PE-based composite material”.
[0049] Comparative Example 2 A PE-based composite material, by weight, comprises: 85 parts low-density polyethylene, 4 parts magnesium fluoride / ETFE melt blend, 12 parts nano-calcium carbonate, 0.5 parts zinc stearate, 0.4 parts antioxidant, 0.4 parts titanate coupling agent, and 0.2 parts polyethylene wax.
[0050] A method for preparing a PE-based composite material includes the following steps: Step 1: Preparation of magnesium fluoride / ETFE melt blend material This step is the same as the step in Example 2, "Preparation of Magnesium Fluoride / ETFE Molten Mixture Material".
[0051] Step 2: Preparation of premix Dry nano-calcium carbonate was mixed with a titanate coupling agent, heated to 70°C, and stirred for 15 minutes at a speed of 1000 rpm to obtain pretreated nano-calcium carbonate. Add low-density polyethylene to a mixer, turn on the stirrer, and stir for 5 minutes at 300 rpm. Then add pretreated nano-calcium carbonate, zinc stearate, and antioxidant in sequence, and continue stirring for 8 minutes. Next, add polyethylene wax and continue stirring for 5 minutes. Finally, add magnesium fluoride / ETFE melt mixture and stir for 5 minutes to obtain the premix.
[0052] Step 3: Obtaining PE-based composite materials This step is the same as the step in Example 2, “Preparation of PE-based composite material”.
[0053] Example 4 Performance Testing (a) The oil-resistant properties of the PE-based composite materials prepared in Examples 1-3 and Comparative Examples 1-2 were tested. The contact angle was measured using a contact angle meter with soybean oil as the test solution. The droplet volume was 5 μL and the temperature was 25℃. The oil contact angle was recorded. The PE-based composite material samples were immersed in soybean oil. The sample size was 10cm × 10cm. After immersion for 30 seconds, the samples were removed, allowed to stand for 1 minute, and the amount of oil adhering to them was calculated by weighing. The specific test results are shown in Table 4.
[0054] Table 4 As shown in Table 4, the oil contact angle of the PE-based composite materials prepared in Examples 1-3 was 135-141°; after immersion in oil for 30 seconds, the amount of oil adhering was 0.05-0.13g. This demonstrates that the PE-based composite materials prepared in this invention have excellent oil-resistant properties.
[0055] (II) Durability tests were conducted on the PE-based composite materials prepared in Examples 1-3 and Comparative Examples 1-2. A friction tester was used to perform friction tests on the PE-based composite materials. The friction medium was 0.5 mL of soybean oil, the frequency was 30 times / min, the load was 500 g, and after 100 friction cycles, the oil contact angle was measured. A household washing machine was used to simulate a home washing scenario for a wash resistance test. The washing time was 45 min, and after 10 washing cycles, the materials were allowed to air dry, and the oil contact angle was measured. Specific test results are shown in Table 5.
[0056] Table 5 As shown in Table 5, the PE-based composite materials prepared in Examples 1-3 exhibited an oil contact angle of 128-133° after 100 rubbing cycles and 125-131° after 10 washing cycles. This demonstrates the excellent durability of the PE-based composite materials prepared in this invention.
[0057] The specific parameters of the raw materials used in this invention are as follows: The density of the low-density polyethylene is 0.910-0.925 g / cm³. 3 .
[0058] The particle size of the nano-calcium carbonate is 10-100 nm.
[0059] The polytetrafluoroethylene micro powder has a particle size of 1-10 μm.
[0060] The antioxidant used is antioxidant 1010.
[0061] The titanate coupling agent selected is NDZ-101.
[0062] Obviously, there are many other possible implementation methods under the concept of this invention. It should be stated here that any changes made under the inventive concept of this invention will fall within the protection scope of this invention.
Claims
1. A method for preparing an oil-resistant PE-based composite material for aprons, characterized in that: The process includes steps such as preparing magnesium fluoride / ETFE melt-mixed materials, preparing premixes, and obtaining PE-based composite materials. The preparation of magnesium fluoride / ETFE melt blend material includes the steps of magnesium fluoride pretreatment and obtaining magnesium fluoride / ETFE melt blend material; The magnesium fluoride pretreatment involves adding magnesium fluoride to anhydrous ethanol and ultrasonically dispersing it; then adding γ-aminopropyltriethoxysilane, heating, and stirring the reaction; followed by centrifugation and drying to obtain modified magnesium fluoride. The magnesium fluoride / ETFE melt blend material is prepared by mixing ethylene-tetrafluoroethylene copolymer with modified magnesium fluoride and adding it to a twin-screw extruder. After extrusion, it is water-cooled, cured, and pelletized to obtain the magnesium fluoride / ETFE melt blend material. The preparation of the premix involves mixing dried nano-calcium carbonate with a titanate coupling agent, heating, and stirring to obtain pretreated nano-calcium carbonate; mixing magnesium fluoride / ETFE melt-mixed material with polytetrafluoroethylene micro powder and stirring at room temperature to obtain pretreated fluorine-based functional mixed powder. Low-density polyethylene is added to a mixer and stirring is started; pretreated nano-calcium carbonate, zinc stearate, and antioxidant are added in sequence and stirred; then polyethylene wax is added and stirred; finally, pretreated fluorine-based functional mixed powder is added and stirred to obtain a premix. The PE-based composite material is obtained by adding the premix to a single-screw extruder, extruding it, blowing it into a film, and cooling it.
2. The method for preparing an oil-resistant PE-based composite material for aprons according to claim 1, characterized in that: In the magnesium fluoride pretreatment step, the mass ratio of magnesium fluoride to anhydrous ethanol is 1:(5-8).
3. The method for preparing an oil-resistant PE-based composite material for aprons according to claim 1, characterized in that: In the magnesium fluoride pretreatment step, ultrasonic dispersion is performed with an ultrasonic power of 300-500W for 30-60 minutes.
4. The method for preparing an oil-resistant PE-based composite material for aprons according to claim 1, characterized in that: In the magnesium fluoride pretreatment step, the amount of γ-aminopropyltriethoxysilane used is 2-3% of the mass of magnesium fluoride.
5. The method for preparing an oil-resistant PE-based composite material for aprons according to claim 1, characterized in that: In the step of preparing magnesium fluoride / ETFE melt-mixed material, the mass ratio of ethylene-tetrafluoroethylene copolymer to modified magnesium fluoride is (5-9):
1.
6. The method for preparing an oil-resistant PE-based composite material for aprons according to claim 1, characterized in that: In the step of preparing magnesium fluoride / ETFE melt blend material, the parameters of the twin-screw extruder are set as follows: feeding section temperature is 240-260℃, compression section temperature is 270-280℃, melting section temperature is 280-300℃, die head section temperature is 270-290℃, screw speed is 300-400rpm, and vacuum degree at the die head is -0.06 to -0.08MPa.
7. The method for preparing an oil-resistant PE-based composite material for aprons according to claim 1, characterized in that: In the preparation of the premix, the raw materials used are proportioned as follows by weight: 80-90 parts of low-density polyethylene, 2-5 parts of magnesium fluoride / ETFE melt mixture, 10-15 parts of nano-calcium carbonate, 0.3-0.8 parts of zinc stearate, 0.2-0.5 parts of antioxidant, 0.3-0.6 parts of titanate coupling agent, 1-2 parts of polytetrafluoroethylene micro powder, and 0.1-0.2 parts of polyethylene wax.
8. The method for preparing an oil-resistant PE-based composite material for aprons according to claim 1, characterized in that: In the step of obtaining PE-based composite materials, the temperature settings of the single-screw extruder are as follows: feeding section 140-150℃, compression section 200-210℃, melting section 230-240℃, homogenization section 240-250℃, connector section 245-255℃, transition section 250-260℃, and die head outlet 255-265℃.
9. The method for preparing an oil-resistant PE-based composite material for aprons according to claim 1, characterized in that: The blown film has an inflation ratio of (2-3):1 and a traction speed of 5-8 m / min.