An antistatic polyethylene open-face masterbatch and its preparation method

Abstract

This invention relates to the field of materials processing technology, specifically to an antistatic polyethylene open-end masterbatch and its preparation method. The antistatic polyethylene open-end masterbatch comprises 40-60 parts of polyethylene matrix resin, 4.8-6.5 parts of vegetable oil-based amide open-end agent, 15-25 parts of functional antistatic agent, and 0.5-1.5 parts of other additives. The functional antistatic agent is prepared by premixing ethylene-1-octene copolymer, itaconic acid, and an initiator, then extruding the mixture through a twin-screw extruder to obtain POE-g-ITA. POE-g-ITA is then premixed again with polyethylene glycol monostearate and extruded through a twin-screw extruder to obtain the functional antistatic agent. The prepared antistatic polyethylene open-end masterbatch is used to prepare polyethylene films, providing stability, good open-end properties, and antistatic properties while ensuring mechanical properties and a good appearance.

Description

Technical Field

[0001] This invention relates to the field of materials processing technology, specifically to an antistatic polyethylene open-face masterbatch and its preparation method. Background Technology

[0002] Polyethylene film is lightweight, non-toxic, impact-resistant, and possesses good corrosion resistance and low-temperature resistance, making it widely used in packaging, agriculture, and industry. With the rapid development of the electronics and precision instrument industries, packaging materials for these products require polyethylene films that, in addition to sufficient mechanical strength and toughness, also exhibit excellent opening smoothness and antistatic properties. The conventional method involves adding opening masterbatch and antistatic masterbatch separately during the polyethylene film preparation process. However, this method has drawbacks. After mixing, functional additives from different masterbatches often accumulate due to compatibility differences, affecting not only antistatic properties and opening smoothness but also increasing film haze and significantly reducing the film's mechanical properties and toughness. Furthermore, excessive migration and crystallization of the antistatic agent can lead to a lack of durability of the antistatic effect and a deterioration in appearance.

[0003] Based on this, an antistatic polyethylene open-end masterbatch and its preparation method are proposed. It is necessary to solve the problems of poor compatibility and excessive migration of antistatic agents in existing functional open-end masterbatches while ensuring mechanical properties and good appearance. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide an antistatic polyethylene open-end masterbatch and its preparation method. The prepared antistatic polyethylene open-end masterbatch can be well applied to the preparation of polyethylene films, ensuring mechanical properties and good appearance while possessing stability, good open-end properties, and antistatic properties.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This application provides an antistatic polyethylene open-face masterbatch, comprising the following components in parts by weight: 40-60 parts of polyethylene matrix resin; 4.8-6.5 parts of vegetable oil-based amide opening agent; 15-25 parts of functional antistatic agent; Other additives: 0.5-1.5 parts; The preparation method of the functional antistatic agent is as follows: ethylene-1-octene copolymer, itaconic acid and initiator are premixed and then extruded through a twin-screw extruder to obtain POE-g-ITA. POE-g-ITA is then premixed again with polyethylene glycol monostearate and extruded through a twin-screw extruder to obtain the functional antistatic agent.

[0006] The aforementioned antistatic polyethylene openable masterbatch uses polyethylene matrix resin as a carrier, and adds functional antistatic agents, vegetable oil-based amide openable agents, and other additives. The functional antistatic agent is prepared by using ethylene-1-octene copolymer with good compatibility with polyethylene matrix resin as a base. Itaconic acid is used to melt-extrude the ethylene-1-octene copolymer in the presence of an initiator to obtain polarized POE-g-ITA with carboxyl groups. This is then melt-extruded with polyethylene glycol monostearate of a specific molecular weight. The antistatic agent polyethylene glycol monostearate and the polarized POE-g-ITA with carboxyl groups have hydrogen bonding. POE-g-ITA has high compatibility with polyethylene matrix resin, enabling uniform dispersion of the antistatic agent polyethylene glycol monostearate in the masterbatch, resulting in a durable and stable antistatic effect. At the addition amount specified in this application, it has almost no impact on the appearance and transparency of the film product and helps improve the stability of the openable performance. Furthermore, the ethylene-1-octene copolymer, as an elastomer, has good compatibility with the polyethylene matrix resin. When the prepared functional antistatic agent is dispersed in the polyethylene matrix, it can also improve the toughness, impact resistance, and puncture resistance of the film product, and enhance the buffer protection performance of the film product.

[0007] Furthermore, the itaconic acid is 4-6% of the mass of the ethylene-1-octene copolymer, thereby ensuring the introduction of sufficient carboxyl groups into the ethylene-1-octene copolymer to facilitate its binding with the antistatic agent polyethylene glycol monostearate; the initiator used is 0.2-1% of the mass of the itaconic acid.

[0008] Furthermore, the polyethylene glycol monostearate has a polyethylene glycol segment molecular weight of 1000-2000. It should be noted that the selection of the polyethylene glycol segment molecular weight of the polyethylene glycol monostearate in this application is very important. If the molecular weight is too large, it will lead to the deterioration of the mechanical properties and appearance of the film and increase the initial resistivity; if the molecular weight is too small, the antistatic properties will not last.

[0009] The mass ratio of the polyethylene glycol monostearate to the itaconic acid is 1:3-5.

[0010] Furthermore, the ethylene-1-octene copolymer, itaconic acid, and initiator are premixed and extruded through a twin-screw extruder at an extrusion temperature of 160-180℃ and a screw speed of 200-300rpm; the POE-g-ITA is premixed with polyethylene glycol monostearate and extruded through a twin-screw extruder at an extrusion temperature of 170-190℃ and a screw speed of 200-300rpm.

[0011] Furthermore, the polyethylene matrix resin is composed of linear low-density polyethylene, high-density polyethylene, and metallocene polyethylene in a weight ratio of 2-3:1-2:0.3-1. The linear low-density polyethylene exhibits good flexibility, tear resistance, and high transparency; the high-density polyethylene improves rigidity, enhancing the film's support and molding performance; and the metallocene polyethylene helps improve the film's tensile strength, puncture resistance, and toughness. Using the aforementioned polyethylene matrix resin ensures superior overall performance.

[0012] Furthermore, the plant oil-based amide opening agent is selected from one or two of oleamide, erucamide, behenamide, cocoamide, and stearamide.

[0013] Furthermore, the plant oil-based amide opening agent is composed of erucamide and oleamide in a mass ratio of 1.5-3:1. Oleamide is synthesized and purified from high-quality plant oleic acid, exhibiting good stability against heat, oxygen, and ultraviolet light, and has a relatively fast migration rate. Erucamide, with its long carbon chain and polar amino groups in its molecular structure, possesses excellent surface polarity and a slower migration rate. The plant oil-based amide opening agent of this application, composed of erucamide and oleamide in a mass ratio of 1.5-3:1, ensures both immediate opening and sustained stability of the opening performance.

[0014] Furthermore, the other additives include 0.1-0.3 parts of antioxidant and 0.4-1.2 parts of dispersant.

[0015] Furthermore, the antioxidant is selected from one or two of antioxidants 1010, 1076, 168, and 626. These antioxidants can prevent the product from yellowing due to oxidation during processing and use.

[0016] Furthermore, the dispersant is selected from one or two of polyethylene wax, oxidized polyethylene wax, and ethylene bis-stearamide. The above dispersant can reduce melt viscosity, promote the uniform dispersion of antistatic agents and opening agents in the matrix resin, and prevent agglomeration.

[0017] This invention also provides a method for preparing the above-mentioned antistatic polyethylene open-face masterbatch, comprising the following steps: (1) Dry the vegetable oil-based amide opening agent; (2) Add polyethylene matrix resin, antioxidant and dispersant to a high-speed mixer for premixing; (3) The mixture is fed into the twin-screw extruder through the main feed port. The functional antistatic agent is added through the side feed port of the fifth zone, and the dried opening agent is added through the side feed port of the ninth zone. The temperature settings of the first to eleventh zones are as follows: 160℃, 180℃, 190℃, 200℃, 190℃, 200℃, 200℃, 195℃, 185℃, 180℃ and 185℃, and the screw speed is 300 rpm. (4) The extruded strip is cooled and pelletized to obtain antistatic polyethylene open-face masterbatch.

[0018] The method for preparing the antistatic polyethylene open-end masterbatch provided in this application ensures uniform dispersion and stability of each component by adopting a segmented melt blending process and a side-feeding method. The prepared masterbatch has both good antistatic and open-end functions. The preparation method provided above is highly operable.

[0019] The antistatic polyethylene open-end masterbatch prepared in this application is suitable for the preparation of polyethylene cast film and blown film. When using it, the above-mentioned antistatic polyethylene open-end masterbatch can be added to polyethylene resin at an addition amount of 3-5% to prepare polyethylene film products by casting or blown molding. The prepared film has good and stable antistatic properties and smooth opening, as well as good mechanical strength and toughness, and no deterioration in appearance.

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. The antistatic polyethylene open-end masterbatch prepared by this invention uses polyethylene matrix resin as a carrier, and adds functional antistatic agents, vegetable oil-based amide open-end agents, and other additives. The functional antistatic agent is prepared by selecting ethylene-1-octene copolymer with good compatibility with polyethylene matrix resin as a base. Itaconic acid is used to melt-extrude the ethylene-1-octene copolymer in the presence of an initiator to obtain polarized POE-g-ITA with carboxyl groups. This is then melt-extruded with polyethylene glycol monostearate of a specific molecular weight. The antistatic agent polyethylene glycol monostearate and the polarized POE-g-ITA with carboxyl groups have hydrogen bonding. POE-g-ITA has high compatibility with polyethylene matrix resin, which can achieve uniform dispersion of the antistatic agent polyethylene glycol monostearate in the masterbatch, obtaining a long-lasting and stable antistatic effect. At the addition amount specified in this application, it has almost no impact on the appearance and transparency of the film product and helps to improve the stability of the open-end performance. The prepared antistatic polyethylene open-end masterbatch can be well applied to the preparation of polyethylene film, ensuring mechanical properties and good appearance while possessing stability, good open-end properties, and antistatic properties.

[0021] 2. The preparation method of the above-mentioned antistatic polyethylene open-end masterbatch provided in this application ensures uniform dispersion and stability of each component by adopting a segmented melt blending process and a side feeding method. The prepared masterbatch has both good antistatic and open-end functions. The preparation method provided above is highly operable.

[0022] 3. The antistatic polyethylene open-end masterbatch prepared in this application is suitable for the preparation of polyethylene cast film and blown film. When using it, the above-mentioned antistatic polyethylene open-end masterbatch can be added to polyethylene resin at an addition amount of 3-5% to prepare polyethylene film products by casting or blown molding. The prepared film has good and stable antistatic properties and smooth opening, as well as good mechanical strength and toughness, and no deterioration in appearance. Detailed Implementation

[0023] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the specific embodiments and comparative examples of this application, the linear low-density polyethylene grade is 7042, the high-density polyethylene grade is 5000S, the metallocene polyethylene grade is 1018FA, and the ethylene-1-octene copolymer grade is ENGAGE 8150. Unless otherwise specified, the methods described are conventional methods, and the raw materials described are all available from publicly available commercial sources.

[0025] Example 1 This embodiment provides a method for preparing antistatic polyethylene open-face masterbatch, including the following steps: 1. Preparation of functional antistatic agents: (1) Add 100 parts of ethylene-1-octene copolymer, 5 parts of itaconic acid and 0.05 parts of dicumyl peroxide to a high-speed mixer and mix at 600 rpm for 5 min at room temperature to obtain a premix.

[0026] (2) The premix was fed into a twin-screw extruder (L / D ratio 28:1), and the temperatures of zones one through seven were set to 160°C, 165°C, 170°C, 175°C, 175°C, 170°C, and 165°C, respectively, with a screw speed of 250 rpm. The mixture was melt-extruded, cooled, and pelletized to obtain POE-g-ITA.

[0027] (3) The above-mentioned POE-g-ITA and 1.25 parts of polyethylene glycol monostearate (PEG segment molecular weight 1500) were added to a high-speed mixer and mixed at 600 rpm for 5 min at room temperature. The mixture was then fed into a twin-screw extruder (L / D ratio 28:1), and the temperatures of zones one to seven were set to 170℃, 175℃, 175℃, 180℃, 185℃, 180℃, and 175℃, respectively, with a screw speed of 250 rpm. The mixture was melt-blended, extruded, cooled, and pelletized to obtain a functional antistatic agent.

[0028] 2. Weigh out each ingredient according to the following formula: 52 parts of polyethylene matrix resin; 5.5 parts of vegetable oil-based amide opening agent; 20 parts of functional antistatic agent; Antioxidant 0.2 parts; 0.8 parts of dispersant; The polyethylene matrix resin is composed of linear low-density polyethylene, high-density polyethylene and metallocene polyethylene in a weight ratio of 2.5:1.5:0.7. The plant oil-based amide opening agent is composed of erucamide and oleamide in a weight ratio of 2:1; The antioxidant used is antioxidant 1010, and the dispersant is polyethylene wax.

[0029] 3. Preparation of antistatic open-face masterbatch (1) Dry the vegetable oil-based amide opening agent in an 80°C forced-air drying oven for 2 hours.

[0030] (2) Add polyethylene matrix resin, antioxidant and dispersant to a high-speed mixer and mix at 600 rpm for 12 min at room temperature.

[0031] (3) Feed the mixture into the twin-screw extruder (L / D is 40:1) through the main feed port. Add the functional antistatic agent through the side feed port of the fifth zone. Add the dried opening agent through the side feed port of the ninth zone. The temperature settings of the first to eleventh zones are as follows: 160℃, 180℃, 190℃, 200℃, 190℃, 200℃, 200℃, 195℃, 185℃, 180℃ and 185℃. The screw speed is 300 rpm. (4) The extruded strip is cooled and pelletized to obtain antistatic polyethylene open-face masterbatch.

[0032] Example 2 This embodiment provides a method for preparing antistatic polyethylene open-face masterbatch, including the following steps: 1. Preparation of functional antistatic agents: (1) Add 100 parts of ethylene-1-octene copolymer, 6 parts of itaconic acid and 0.012 parts of dicumyl peroxide to a high-speed mixer and mix at 600 rpm for 5 min at room temperature to obtain a premix.

[0033] (2) The premix was fed into a twin-screw extruder (L / D ratio 28:1), and the temperatures of zones one through seven were set to 160°C, 165°C, 170°C, 175°C, 175°C, 170°C, and 165°C, respectively, with a screw speed of 250 rpm. The mixture was melt-extruded, cooled, and pelletized to obtain POE-g-ITA.

[0034] (3) The above-mentioned POE-g-ITA and 1.2 parts of polyethylene glycol monostearate (PEG segment molecular weight 1000) were added to a high-speed mixer and mixed at 600 rpm for 5 min at room temperature. The mixture was then fed into a twin-screw extruder (L / D ratio 28:1), and the temperatures of zones one to seven were set to 170℃, 175℃, 175℃, 180℃, 185℃, 180℃, and 175℃, respectively, with a screw speed of 250 rpm. The mixture was melt-blended, extruded, cooled, and pelletized to obtain a functional antistatic agent.

[0035] 2. Weigh out each ingredient according to the following formula: 48 parts of polyethylene matrix resin; 6 parts of vegetable oil-based amide opening agent; 25 parts of functional antistatic agent; Antioxidant 0.3 parts; 0.9 parts of dispersant; The polyethylene matrix resin is composed of linear low-density polyethylene, high-density polyethylene and metallocene polyethylene in a weight ratio of 2.5:1.5:0.8. The plant oil-based amide opening agent is composed of erucamide and oleamide in a weight ratio of 3:1; The antioxidant used is antioxidant 1010, and the dispersant is polyethylene wax.

[0036] 3. Preparation of antistatic open-face masterbatch (1) Dry the vegetable oil-based amide opening agent in an 80°C forced-air drying oven for 2 hours.

[0037] (2) Add polyethylene matrix resin, antioxidant and dispersant to a high-speed mixer and mix at 600 rpm for 12 min at room temperature.

[0038] (3) Feed the mixture into the twin-screw extruder (L / D is 40:1) through the main feed port. Add the functional antistatic agent through the side feed port of the fifth zone. Add the dried opening agent through the side feed port of the ninth zone. The temperature settings of the first to eleventh zones are as follows: 160℃, 180℃, 190℃, 200℃, 190℃, 200℃, 200℃, 195℃, 185℃, 180℃ and 185℃. The screw speed is 300 rpm. (4) The extruded strip is cooled and pelletized to obtain antistatic polyethylene open-face masterbatch.

[0039] Example 3 This embodiment provides a method for preparing antistatic polyethylene open-face masterbatch, including the following steps: 1. Preparation of functional antistatic agents: (1) Add 100 parts of ethylene-1-octene copolymer, 4 parts of itaconic acid and 0.01 parts of dicumyl peroxide to a high-speed mixer and mix at 600 rpm for 5 min at room temperature to obtain a premix.

[0040] (2) The premix was fed into a twin-screw extruder (L / D ratio 28:1), and the temperatures of zones one through seven were set to 160°C, 165°C, 170°C, 175°C, 175°C, 170°C, and 165°C, respectively, with a screw speed of 250 rpm. The mixture was melt-extruded, cooled, and pelletized to obtain POE-g-ITA.

[0041] (3) The above-mentioned POE-g-ITA and 1.35 parts of polyethylene glycol monostearate (PEG segment molecular weight 2000) were added to a high-speed mixer and mixed at 600 rpm for 5 min at room temperature. The mixture was then fed into a twin-screw extruder (L / D ratio 28:1), and the temperatures of zones one to seven were set to 170℃, 175℃, 175℃, 180℃, 185℃, 180℃, and 175℃, respectively, with a screw speed of 250 rpm. The mixture was melt-blended, extruded, cooled, and pelletized to obtain a functional antistatic agent.

[0042] 2. Weigh out each ingredient according to the following formula: 55 parts of polyethylene matrix resin; 5 parts of vegetable oil-based amide opening agent; 15 parts of functional antistatic agent; Antioxidant 0.15 parts; 0.65 parts of dispersant; The polyethylene matrix resin is composed of linear low-density polyethylene, high-density polyethylene and metallocene polyethylene in a weight ratio of 2.8:2:0.7. The plant oil-based amide opening agent is composed of erucamide and oleamide in a weight ratio of 2:1; The antioxidant used is antioxidant 1010, and the dispersant is polyethylene wax.

[0043] 3. Preparation of antistatic open-face masterbatch (1) Dry the vegetable oil-based amide opening agent in an 80°C forced-air drying oven for 2 hours.

[0044] (2) Add polyethylene matrix resin, antioxidant and dispersant to a high-speed mixer and mix at 600 rpm for 12 min at room temperature.

[0045] (3) Feed the mixture into the twin-screw extruder (L / D is 40:1) through the main feed port. Add the functional antistatic agent through the side feed port of the fifth zone. Add the dried opening agent through the side feed port of the ninth zone. The temperature settings of the first to eleventh zones are as follows: 160℃, 180℃, 190℃, 200℃, 190℃, 200℃, 200℃, 195℃, 185℃, 180℃ and 185℃. The screw speed is 300 rpm. (4) The extruded strip is cooled and pelletized to obtain antistatic polyethylene open-face masterbatch.

[0046] Comparative Example 1 The method is the same as in Example 1, except that in this comparative example, the functional antistatic agent is replaced by an equal weight of polyethylene matrix resin.

[0047] Comparative Example 2 The method is the same as in Example 1, except that in the preparation method of the functional antistatic agent in this comparative example, itaconic acid is replaced with an equal weight of maleic acid.

[0048] Comparative Example 3 The method of Example 1 is followed, except that the functional antistatic agent is replaced with an antistatic agent prepared by the following method: 100 parts of ethylene-1-octene copolymer and 1.25 parts of polyethylene glycol monostearate (PEG segment molecular weight 1500) are loaded into a high-speed mixer and mixed at 600 rpm for 5 minutes at room temperature. The mixture is then fed into a twin-screw extruder (L / D ratio 28:1), with zone temperatures set to 170°C, 175°C, 175°C, 180°C, 185°C, 180°C, and 175°C, respectively, and a screw speed of 250 rpm. The mixture is melt-blended, extruded, cooled, and pelletized to obtain the functional antistatic agent.

[0049] Comparative Example 4 The method is the same as in Example 1, except that the molecular weight of the polyethylene glycol monostearate (PEG) segment is 400.

[0050] Comparative Example 5 The method is the same as in Example 1, except that the molecular weight of the polyethylene glycol monostearate (PEG) segment is 4000.

[0051] Comparative Example 6 The method is the same as in Example 1, except that the amount of polyethylene glycol monostearate (PEG) segments used is 3.6 parts.

[0052] Test case The masterbatches obtained in the above examples and comparative examples were mixed with linear low-density polyethylene (grade 7042) at a dosage of 5%, and blown at a blowing temperature of 170°C and a traction speed of 15 m / min to obtain polyethylene films with a thickness of approximately 30 μm. After conditioning the films at 23±2°C and 50±5% humidity for 24 hours, antistatic properties, opening properties, mechanical properties, stability, and appearance properties were tested. Surface resistivity was determined according to GB / T1410; a lower value indicates better antistatic properties. Static friction coefficient was determined according to GB / T10006; a lower value indicates better opening properties. Tensile strength and elongation at break were determined according to GB / T1040.3. The stability test method involved placing the film samples in a 60°C oven for accelerated aging for 7 days, and then testing the surface resistivity and static friction coefficient again using the same method. The appearance and optical properties of the thin film were assessed by visually observing the surface smoothness and presence of crystal points, and the haze of the film was tested according to GB / T 2410. The test results are shown in Table 1. Table 1: Thin Film Performance Test Results

[0053] Continued from Table 1: Thin Film Performance Test Results

[0054] As can be seen from the above, the films prepared using the antistatic polyolefin open-end masterbatch in Examples 1-3 of this application have good antistatic properties and open-end performance, as well as good appearance and mechanical properties. After aging, the antistatic properties and open-end performance do not decrease significantly, and the overall performance is excellent.

[0055] Comparative Example 1, without the addition of functional antistatic agents, produced a film with almost no antistatic effect. After accelerated aging, the openability decreased, and the tensile strength and elongation at break of the film also decreased.

[0056] In the preparation method of the functional antistatic agent in Comparative Example 2, itaconic acid was replaced by maleic acid of equal weight. The initial antistatic properties and opening properties of the prepared film were not significantly different from those in Example 1, but after accelerated aging, both the opening properties and antistatic properties were significantly reduced.

[0057] In Comparative Example 3, itaconic acid was not added during the preparation of the functional antistatic agent. The mechanical properties and appearance of the film deteriorated, and the initial surface resistivity and static friction coefficient were both increased. After accelerated aging, the surface resistivity and static friction coefficient increased significantly, indicating that the antistatic properties and opening properties were greatly reduced after accelerated aging.

[0058] In Comparative Example 4, the molecular weight of the PEG segment in polyethylene glycol monostearate was 400. After accelerated aging, the resistivity increased. In Comparative Example 5, the molecular weight of the PEG segment in polyethylene glycol monostearate was 4000. The mechanical properties and appearance of the film deteriorated, the initial resistivity increased, and the antistatic properties were poor. This indicates that the molecular weight of the PEG segment in polyethylene glycol monostearate is crucial to the performance of the prepared film.

[0059] In Comparative Example 6, the amount of polyethylene glycol monostearate was 3.6 parts. The mechanical properties and appearance of the film deteriorated. After accelerated aging, the resistivity and static friction coefficient were higher, indicating that the antistatic properties and opening properties were poor after accelerated aging.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and not to limit them; although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this application or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this application.

Claims

1. An antistatic polyethylene open-face masterbatch, characterized in that, The components include the following parts by weight: 40-60 parts of polyethylene matrix resin; 4.8-6.5 parts of vegetable oil-based amide opening agent; 15-25 parts of functional antistatic agent; Other additives: 0.5-1.5 parts; The preparation method of the functional antistatic agent is as follows: ethylene-1-octene copolymer, itaconic acid and initiator are premixed and then extruded through a twin-screw extruder to obtain POE-g-ITA. POE-g-ITA is premixed again with polyethylene glycol monostearate and then extruded through a twin-screw extruder to obtain the functional antistatic agent. The polyethylene glycol monostearate has a polyethylene glycol segment molecular weight of 1000-2000; The mass ratio of the polyethylene glycol monostearate to the itaconic acid is 1:3-5; The plant oil-based amide opening agent is selected from one or two of oleamide, erucamide, behenamide, cocoamide, and stearamide.

2. The antistatic polyethylene open-face masterbatch according to claim 1, characterized in that, The itaconic acid is 4-6% of the mass of the ethylene-1-octene copolymer; the initiator is 0.2-1% of the mass of the itaconic acid.

3. The antistatic polyethylene open-face masterbatch according to claim 1, characterized in that, The ethylene-1-octene copolymer, itaconic acid and initiator were premixed and then extruded through a twin-screw extruder at an extrusion temperature of 160-180℃ and a screw speed of 200-300rpm. After premixing POE-g-ITA with polyethylene glycol monostearate, the mixture is extruded through a twin-screw extruder at a temperature of 170-190℃ and a screw speed of 200-300rpm.

4. The antistatic polyethylene open-face masterbatch according to claim 1, characterized in that, The polyethylene matrix resin is composed of linear low-density polyethylene, high-density polyethylene, and metallocene polyethylene in a weight ratio of 2-3:1-2:0.3-1.

5. The antistatic polyethylene open-face masterbatch according to claim 1, characterized in that, The plant oil-based amide opening agent is composed of erucamide and oleamide in a mass ratio of 1.5-3:

1.

6. The antistatic polyethylene open-face masterbatch according to claim 1, characterized in that, The other additives include 0.1-0.3 parts of antioxidant and 0.4-1.2 parts of dispersant.

7. The antistatic polyethylene open-face masterbatch according to claim 6, characterized in that, The antioxidant is selected from one or two of antioxidant 1010, antioxidant 1076, antioxidant 168, and antioxidant 626.

8. The antistatic polyethylene open-face masterbatch according to claim 6, characterized in that, The dispersant is selected from one or two of polyethylene wax, oxidized polyethylene wax, and ethylene bis-stearamide.

9. A method for preparing an antistatic polyethylene open-face masterbatch according to any one of claims 1-8, characterized in that, Includes the following steps: (1) Dry the vegetable oil-based amide opening agent; (2) Add polyethylene matrix resin, antioxidant and dispersant to a high-speed mixer for premixing; (3) The mixture is fed into the twin-screw extruder through the main feed port. The functional antistatic agent is added through the side feed port of the fifth zone, and the dried opening agent is added through the side feed port of the ninth zone. The temperature settings of the first to eleventh zones are as follows: 160℃, 180℃, 190℃, 200℃, 190℃, 200℃, 200℃, 195℃, 185℃, 180℃ and 185℃, and the screw speed is 300 rpm. (4) The extruded strip is cooled and pelletized to obtain antistatic polyethylene open-face masterbatch.

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