A dual-channel antistatic film and preparation method thereof

Abstract

The present invention provides a dual-path antistatic film and a preparation method thereof, and relates to the technical field of antistatic films. A dual-path antistatic film comprises the following raw materials in parts by mass: 80-150 parts of polyolefin, 0.00005-0.0002 parts of conductive polymer material, 3-15 parts of antistatic agent, 0-1 parts of lubricant, and 0-0.0001 parts of conductive microfiber. The dual-path antistatic film provided by the present invention has low surface resistivity and excellent antistatic effect.

Description

Technical Field

[0001] The invention relates to the technical field of antistatic films, and in particular to a dual-path antistatic film and a preparation method thereof. Background Art

[0002] Film products made of polypropylene and polyethylene through blow molding, cast film, uniaxial stretching and biaxial stretching are widely used in various fields, but their materials are very easy to accumulate static electricity (surface resistance 10 13 Ω or more), which not only causes production problems, but also leads to usage restrictions for downstream customers. Therefore, antistatic agents are often added to the raw materials during the preparation of polyolefin films. Through the aging process, the active ingredients migrate to the surface of the film to absorb moisture in the air to form a conductive path, thereby reducing the surface resistance of the film (10 12 Ω or less). If the film is to achieve a lower surface resistance, more antistatic agent needs to be added, but this will cause the film surface to precipitate oil. Summary of the invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a dual-path antistatic film and a preparation method thereof.

[0004] The double-channel antistatic film provided by the present invention comprises the following raw materials in parts by weight: 80-150 parts of polyolefin, 0.00005-0.0002 parts of conductive polymer material, 3-15 parts of antistatic agent, 0-1 parts of lubricant, and 0-0.0001 parts of conductive microfiber.

[0005] Preferably, the polyolefin is selected from one or more of polypropylene and polyethylene.

[0006] Preferably, the conductive polymer material is selected from one or more of polypyrrole and polyacetylene.

[0007] Preferably, the preparation method of the antistatic agent comprises the following steps: S1, dissolving MAH in a solvent to obtain solution A; dissolving DCP in a solvent to obtain solution B; uniformly mixing solution A, solution B and polyolefin, extruding, granulating and vacuum drying to obtain MAH-grafted polyolefin; S2, mixing the MAH-grafted polyolefin and a polyamide polyether block copolymer, extruding, granulating and vacuum drying to obtain an antistatic agent.

[0008] More preferably, in said S1, the solvent is selected from one or more of DMF, ether and acetone.

[0009] More preferably, in the S1, the mass ratio of MAH, DCP and polyolefin is (2-5):(0.1-0.5):100.

[0010] More preferably, in said S1, the concentration of solution A is 50-80%; the concentration of solution B is 50-80%.

[0011] More preferably, in said S1, the extrusion temperature is 170-200°C.

[0012] More preferably, in said S1, the rotation speed during the extrusion process is 30-60 r / min.

[0013] More preferably, in said S2, the extrusion temperature is 140-170°C.

[0014] More preferably, in said S2, the rotation speed during the extrusion process is 130-160 r / min.

[0015] More preferably, in said S2, the mass ratio of the MAH grafted polyolefin to the polyamide polyether block copolymer is 1:(3-7).

[0016] More preferably, in said S2, the molecular weight of the polyamide polyether block copolymer is 10,000-30,000.

[0017] The antistatic agent is made by mixing MAH, DCP, polyolefin, and polyamide polyether block copolymer through a specific process. The prepared antistatic agent has excellent antistatic effect and good compatibility with film materials. By controlling the extrusion temperature and the speed during the extrusion process, it is beneficial for the material to react fully and evenly, and further helps to improve the compatibility of the antistatic agent with the film material.

[0018] Preferably, the lubricant is selected from one or more of PP wax and PE wax.

[0019] Preferably, the conductive microfibers are selected from one or more of nano copper wires and carbon nanotubes.

[0020] The present invention also provides a method for preparing a dual-path antistatic film, comprising the following steps:

[0021] The polyolefin, conductive polymer material, antistatic agent, lubricant and conductive microfiber are uniformly mixed, melt-extruded, cast into film, biaxially stretched and cooled to obtain a double-path antistatic film.

[0022] Preferably, the extrusion temperature is 190-230°C.

[0023] Preferably, the stretching ratio is 4-5.

[0024] Preferably, the cooling is water cooling.

[0025] The beneficial effects of the present invention are:

[0026] The present invention adds an antistatic agent, a conductive polymer material, and conductive microfibers to a polyolefin film for synergistic effect, thereby establishing a double-path conductive path on the surface of the film and enhancing the antistatic ability of the film surface. The present invention can achieve a high antistatic effect while using a small amount of antistatic agent, and the film has good transparency and low precipitates.

[0027] The dual-path method of the present invention uses a lower amount of antistatic agent, especially a precipitation antistatic agent, which can reduce the risk of precipitation of the film. The dual-path method can effectively connect each conductive area, strengthen the conductive network on the surface of the film, and improve the static conductivity of the film product. The polymer conductive material is used as the conductive path, which has good compatibility with the film matrix, and the addition of related materials has little effect on the film performance.

[0028] Compared with the surface antistatic of the traditional film, the dual-path method used in the present invention is conducive to reducing the surface resistance of the film, introducing a new conductive path to connect the surface layer to enhance the conductivity of the film surface. The present invention uses conductive microfibers as internal paths, which have a linear structure and are more likely to serve as paths connecting various conductive phases; conductive polymer materials are used as the second conductive path, which has good compatibility with polymer materials and is more likely to be compatible with the base film material. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the principle of the dual-path antistatic film proposed in the present invention, 1-static conductive area, 2-conductive path. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is described in detail through specific embodiments.

[0031] Unless otherwise specified, the materials, reagents, etc. used in the following examples and comparative examples can be obtained from commercial sources.

[0032] Example 1

[0033] A double-channel antistatic film comprises the following raw materials in parts by weight: 100 parts of polypropylene, 0.00005 parts of polyacetylene, 3 parts of antistatic agent, and 1 part of PP wax.

[0034] The preparation method of an antistatic agent comprises the following steps: S1, dissolving MAH in a mixed solvent of DMF and ether (mass ratio is 1:1) to obtain solution A; dissolving DCP in acetone to obtain solution B; uniformly mixing solution A, solution B and polyolefin, wherein the mass ratio of MAH, DCP and polyolefin is 4:0.2:100, controlling the moisture content within 0.5%, extruding at a temperature of 185°C and a rotation speed of 45r / min, granulating and vacuum drying at 50°C to obtain MAH grafted polyolefin; S2, mixing the MAH grafted polyolefin and a polyamide polyether block copolymer at a mass ratio of 1:5, extruding at a temperature of 165°C and a rotation speed of 145r / min, granulating and vacuum drying to obtain an antistatic agent.

[0035] The method for preparing a dual-channel antistatic film comprises the following steps:

[0036] Polypropylene, polyacetylene, antistatic agent and PP wax are mixed evenly, melt-extruded at 210°C, cast into film, biaxially stretched with a stretch ratio of 4.5, and cooled to obtain a double-channel antistatic film.

[0037] Example 2

[0038] A double-channel antistatic film comprises the following raw materials in parts by weight: 150 parts of polypropylene, 0.0001 parts of polyacetylene, and 5 parts of an antistatic agent.

[0039] The preparation method of an antistatic agent comprises the following steps: S1, dissolving MAH in a mixed solvent of DMF and ether (mass ratio is 1:1) to obtain solution A; dissolving DCP in acetone to obtain solution B; uniformly mixing solution A, solution B and polyolefin, wherein the mass ratio of MAH, DCP and polyolefin is 3:0.1:100, controlling the moisture content within 0.5%, extruding at a temperature of 180°C and a rotation speed of 50 r / min, granulating and vacuum drying at 55°C to obtain MAH grafted polyolefin; S2, mixing the MAH grafted polyolefin and a polyamide polyether block copolymer at a mass ratio of 1:4, extruding at a temperature of 150°C and a rotation speed of 150 r / min, granulating and vacuum drying to obtain an antistatic agent.

[0040] The method for preparing a dual-channel antistatic film comprises the following steps:

[0041] Polypropylene, polyacetylene and antistatic agent are mixed evenly, melt-extruded at 200°C, cast into film, biaxially stretched with a stretch ratio of 4.5, and cooled to obtain a double-path antistatic film.

[0042] Example 3

[0043] A double-channel antistatic film comprises the following raw materials in parts by weight: 100 parts of polypropylene, 0.0001 parts of polyacetylene, 3 parts of antistatic agent, 1 part of PP wax, and 0.00005 parts of carbon nanotubes.

[0044] The preparation method of an antistatic agent comprises the following steps: S1, dissolving MAH in a mixed solvent of DMF and ether (mass ratio is 1:2) to obtain solution A; dissolving DCP in acetone to obtain solution B; uniformly mixing solution A, solution B and polyolefin, wherein the mass ratio of MAH, DCP and polyolefin is 4:0.2:100, controlling the moisture content within 0.5%, extruding at a temperature of 185°C and a rotation speed of 50 r / min, granulating and vacuum drying at 50°C to obtain MAH grafted polyolefin; S2, mixing the MAH grafted polyolefin and a polyamide polyether block copolymer at a mass ratio of 1:5, extruding at a temperature of 150°C and a rotation speed of 140 r / min, granulating and vacuum drying to obtain an antistatic agent.

[0045] The method for preparing a dual-channel antistatic film comprises the following steps:

[0046] Polypropylene, polyacetylene, antistatic agent, PP wax and carbon nanotubes are mixed evenly, melt-extruded at 210° C., cast into a film, biaxially stretched with a stretch ratio of 4.5, and cooled to obtain a double-path antistatic film.

[0047] Example 4

[0048] A double-channel antistatic film comprises the following raw materials in parts by weight: 100 parts of polypropylene, 0.0002 parts of polyacetylene, 3 parts of antistatic agent, 1 part of PP wax, and 0.00005 parts of carbon nanotubes.

[0049] The preparation method of an antistatic agent comprises the following steps: S1, dissolving MAH in a mixed solvent of DMF and ether (mass ratio is 1:2) to obtain solution A; dissolving DCP in acetone to obtain solution B; uniformly mixing solution A, solution B and polyolefin, wherein the mass ratio of MAH, DCP and polyolefin is 4:0.2:100, controlling the moisture content within 0.5%, extruding at a temperature of 175°C and a rotation speed of 60r / min, granulating and vacuum drying at 50°C to obtain MAH grafted polyolefin; S2, mixing the MAH grafted polyolefin and a polyamide polyether block copolymer at a mass ratio of 1:5, extruding at a temperature of 160°C and a rotation speed of 155r / min, granulating and vacuum drying to obtain an antistatic agent.

[0050] The method for preparing a dual-channel antistatic film comprises the following steps:

[0051] Polypropylene, polyacetylene, antistatic agent, PP wax and carbon nanotubes are mixed evenly, melt-extruded at 200° C., cast into a film, biaxially stretched with a stretch ratio of 4.5, and cooled to obtain a double-channel antistatic film.

[0052] Example 5

[0053] A double-channel antistatic film comprises the following raw materials in parts by weight: 100 parts of polypropylene, 0.0002 parts of polyacetylene, 3 parts of antistatic agent, 1 part of PP wax, and 0.0002 parts of carbon nanotubes.

[0054] The preparation method of an antistatic agent comprises the following steps: S1, dissolving MAH in a mixed solvent of DMF and ether (mass ratio is 1:2) to obtain solution A; dissolving DCP in acetone to obtain solution B; uniformly mixing solution A, solution B and polyolefin, wherein the mass ratio of MAH, DCP and polyolefin is 4:0.2:100, controlling the moisture content within 0.5%, extruding at a temperature of 180°C and a rotation speed of 45r / min, granulating and vacuum drying at 50°C to obtain MAH grafted polyolefin; S2, mixing the MAH grafted polyolefin and a polyamide polyether block copolymer at a mass ratio of 1:5, extruding at a temperature of 155°C and a rotation speed of 150r / min, granulating and vacuum drying to obtain an antistatic agent.

[0055] The method for preparing a dual-channel antistatic film comprises the following steps:

[0056] Polypropylene, polyacetylene, antistatic agent, PP wax and carbon nanotubes are mixed evenly, melt-extruded at 210° C., cast into a film, biaxially stretched at a stretch ratio of 4-5, and cooled to obtain a double-channel antistatic film.

[0057] Comparative Example 1

[0058] A polypropylene film comprises the following raw materials in parts by mass: 100 parts of polypropylene, 0.0001 parts of polyacetylene, 1 part of PP wax, and 0.00005 parts of carbon nanotubes.

[0059] The preparation method of polypropylene film comprises the following steps: uniformly mixing polypropylene, polyacetylene, PP wax and carbon nanotubes, melt extruding at 200°C, casting into film, biaxially stretching with a stretching ratio of 4.5, and cooling to obtain the polypropylene film.

[0060] Comparative Example 2

[0061] A polypropylene film comprises the following raw materials in parts by mass: 100 parts of polypropylene, 0.0001 parts of polyacetylene, and 1 part of PP wax.

[0062] The preparation method of polypropylene film comprises the following steps: uniformly mixing polypropylene, polyacetylene and PP wax, melt extruding at 200 DEG C, casting into film, biaxially stretching with a stretching ratio of 4.5, and cooling to obtain polypropylene film.

[0063] Comparative Example 3

[0064] A polypropylene film comprises the following raw materials in parts by weight: 100 parts of polypropylene, 3 parts of antistatic agent, and 1 part of PP wax; the preparation method of the antistatic agent is the same as that in Example 1.

[0065] The preparation method of polypropylene film comprises the following steps: uniformly mixing polypropylene, antistatic agent and PP wax, melt extruding at 200 DEG C, casting into film, biaxially stretching with a stretching ratio of 4.5, and cooling to obtain polypropylene film.

[0066] The surface resistivity of the above film was tested, and the test results are shown in Table 1.

[0067] Table 1

[0068]

[0069]

[0070] Among them, 10 13 Ω / m 2 It is the minimum current limit of the device test. When it is displayed as 10 13 Ω / m 2 When the film surface has no electrostatic conductivity, its actual surface resistivity will be much greater than 10 13 Ω / m 2 .

[0071] The dual-channel antistatic films prepared in Examples 3 and 4 have gray film surfaces, indicating that excessive addition of carbon conductive powder will cause the film surface to turn black.

[0072] It can be seen from the data in Table 1 that the surface resistivity of the dual-channel antistatic film prepared by the present invention is 10 8 ~10 11 The above results show that the dual-path antistatic film prepared by the present invention has excellent antistatic effect. The present invention significantly reduces the surface resistance by regulating the raw material formulation and preparation process of the film.

[0073] like Figure 1 As shown, Figure 1 This is a schematic diagram of the principle of the dual-path antistatic film proposed in the present invention, 1-static conductive area, 2-conductive path. The dual-path method used in the present invention is compared with the surface antistatic of the traditional film. The dual-path method is beneficial to reducing the surface resistance of the film, and introducing a new conductive path to connect the surface layer to enhance the conductivity of the film surface. The present invention uses conductive microfibers as the internal path, which has a linear structure and is more likely to serve as a path connecting each conductive phase; conductive polymer materials are used as the second conductive path, which has good compatibility with polymer materials and is more compatible with the base film material.

[0074] In summary, the dual-path antistatic film provided by the present invention has low surface resistivity and excellent antistatic effect.

[0075] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dual-channel antistatic film, characterized in that: The invention comprises the following raw materials in parts by weight: 80-150 parts of polyolefin, 0.00005-0.0002 parts of conductive polymer material, 3-15 parts of antistatic agent, 0-1 parts of lubricant and 0-0.0001 parts of conductive microfiber.

2. The dual-path antistatic film according to claim 1, characterized in that: The preparation method of the antistatic agent comprises the following steps: S1, dissolving MAH in a solvent to obtain a solution A; dissolving DCP in a solvent to obtain a solution B; uniformly mixing the solution A, the solution B and a polyolefin, extruding, granulating and vacuum drying to obtain a MAH-grafted polyolefin; S2, mixing the MAH-grafted polyolefin and a polyamide polyether block copolymer, extruding, granulating and vacuum drying to obtain an antistatic agent.

3. The dual-path antistatic film according to claim 2, characterized in that: In the S1, the solvent is selected from one or more of DMF, ether, and acetone; the mass ratio of MAH, DCP, and polyolefin is (2-5):(0.1-0.5):100; the extrusion temperature is 170-200° C.; and the rotation speed during the extrusion process is 30-60 r / min.

4. The dual-path antistatic film according to claim 2, characterized in that: In the S2, the extrusion temperature is 140-170° C.; the rotation speed during the extrusion process is 130-160 r / min; and the mass ratio of the MAH grafted polyolefin to the polyamide polyether block copolymer is 1:(3-7).

5. The dual-path antistatic film according to claim 1, characterized in that: The polyolefin is selected from one or more of polypropylene and polyethylene.

6. The dual-path antistatic film according to claim 1, characterized in that: The conductive polymer material is selected from one or more of polypyrrole and polyacetylene.

7. The dual-path antistatic film according to claim 1, characterized in that: The lubricant is selected from one or more of PP wax and PE wax.

8. The dual-path antistatic film according to claim 1, characterized in that: The conductive microfibers are selected from one or more of nano copper wires and carbon nano tubes.

9. A method for preparing a dual-path antistatic film according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: uniformly mixing polyolefin, conductive polymer material, antistatic agent, lubricant and conductive microfiber, melt extruding, casting into film, biaxially stretching and cooling to obtain a double-path antistatic film.

10. The preparation method according to claim 9, characterized in that: The extrusion temperature is 190-230° C.; the stretching ratio is 4-5.

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