Antistatic BOPP (biaxially-oriented polypropylene) composite film

Abstract

The utility model discloses an antistatic BOPP (biaxially-oriented polypropylene) composite film, and belongs to the technical field of BOPP films. Comprising a BOPP base layer, an attached reticulate pattern layer, a surrounding edge, a first antistatic layer and a second antistatic layer, wherein the attached reticulate pattern layer is arranged on one surface of the BOPP base layer; the surrounding edges are integrally formed on the two side edges of the BOPP base layer; the attached reticulate pattern layer is arranged between the surrounding edges; the surrounding edges on the same side are mutually pressed into a whole; the first antistatic layer is filled and coated on the outer surface of the adhesion reticulate pattern layer; the second anti-static layer is arranged on one surface, far away from the first anti-static layer, of the BOPP base layer in a co-extrusion manner through a casting sheet roller; the outer surfaces of the first anti-static layer and the second anti-static layer are flush with the outer surface of the surrounding edge; the surrounding edge and the second antistatic layer are made of the same material; according to the anti-static BOPP composite film disclosed by the utility model, the stripping of the structural layer cannot be caused, and the anti-static layer on the surface of the film can be integrated; the overall antistatic effect is good.

Description

Technical Field

[0001] The utility model specifically relates to an antistatic BOPP composite film, belonging to the technical field of BOPP films. Background Art

[0002] BOPP film is a flexible packaging material with high tensile strength, impact strength, rigidity, toughness and good transparency. The raw material of BOPP film is mainly polypropylene, which has particularly poor electrical conductivity and very high resistivity, so it is easy to accumulate static electricity during friction during production and use. Since the surface of BOPP is very smooth, coupled with the effects of static electricity, it is very easy to stick together, which is easy to damage the BOPP film and reduce the service life. For this reason, Chinese patent publication number: CN213861135U discloses an antistatic BOPP film, including a first BOPP layer, a second BOPP layer, a glass fiber film layer, and an antistatic layer, wherein the glass fiber film layer is arranged between the first BOPP layer and the second BOPP layer, and the structure effectively prevents static electricity accumulation on the surface of the BOPP film and prolongs the service life. However, the film thickness of the structure is large, which is not conducive to later packaging use, and each structural layer is easy to peel off, and the antistatic layer on the inner and outer surfaces of the film is separated. When the antistatic layer on the inner or outer surface of the film is partially damaged, it is easy to cause local charge accumulation. Utility Model Content

[0003] In order to solve the above problems, the utility model proposes an antistatic BOPP composite film, which has a thinner thickness and does not require a gluing process, will not cause peeling of the structural layer, and can integrate the antistatic layer on the surface of the film.

[0004] The antistatic BOPP composite film of the utility model comprises:

[0005] BOPP base layer;

[0006] An attachment textured layer, wherein the attachment textured layer is arranged on one side of the BOPP base layer;

[0007] The surrounding edges are integrally formed on the two sides of the BOPP base layer; the attachment textured layer is arranged between the surrounding edges; the surrounding edges on the same side are pressed together into one body;

[0008] A first antistatic layer, which is filled and coated on the outer surface of the adhesion textured layer;

[0009] A second antistatic layer, wherein the second antistatic layer is co-extruded on a side of the BOPP base layer away from the first antistatic layer by a casting roller; the thickness of the BOPP base layer is 15-30 μm; the thickness of the first antistatic layer and the second antistatic layer is 5-8 μm;

[0010] The outer surfaces of the first antistatic layer and the second antistatic layer are flush with the outer surface of the surrounding edge;

[0011] The surrounding edge and the second antistatic layer are made of the same material; the first antistatic layer, the surrounding edge and the second antistatic layer are connected as a whole.

[0012] The BOPP base layer, the surrounding edge and the second antistatic layer can be melted and filtered, and enter the flow channel corresponding to the die head through the co-extrusion feed block; the BOPP base layer, the surrounding edge and the second antistatic layer cast sheet are formed into one; then, the attached textured layer is processed between the surrounding edges, and the first antistatic layer is filled and coated on the attached textured layer; the surrounding edge can protect the first antistatic layer and the second antistatic layer; prevent the first antistatic layer and the second antistatic layer from peeling off from the side of the BOPP base layer; the surrounding edge can connect the first antistatic layer and the second antistatic layer as one; the first antistatic layer, the surrounding edge and the second antistatic layer are allowed to conduct and release the generated static charge through ionic conduction.

[0013] Furthermore, the adhesion textured layer is composed of an adhesion liquid, which is coated on the surface of the BOPP base layer by an anilox roller and dried and solidified; the adhesion liquid is chlorinated polyacrylic resin or modified chlorinated polyethylene, and the adhesion liquid is rolled on the surface of the BOPP base layer by an anilox roller, and after drying and solidification, an adhesion textured layer can be obtained, thereby enabling the first antistatic layer and the BOPP base layer to be tightly combined, and preventing the first antistatic layer from peeling off from the surface of the BOPP base layer.

[0014] Furthermore, a printing layer is provided between the BOPP base layer and the attached anilox layer, and the printing layer is covered by the attached anilox layer, which can prevent the first antistatic layer from being damaged when the film is printed.

[0015] Furthermore, the attached textured layer is a textured layer laminated on the BOPP base layer by a silk roller, and the textured layer is obtained by silk screen printing directly on the BOPP base layer. The external coating antistatic agent is coated on the attached textured layer, and the fine mesh structure can prevent the external coating antistatic agent from being scratched and detached from the film surface.

[0016] Furthermore, the first antistatic layer is an external coating antistatic agent; the antistatic agent of the second antistatic layer is a polymer permanent antistatic agent mixed and melted inside the carrier; the carrier is a polypropylene masterbatch; that is, the raw material of the second antistatic layer adopts a polymer permanent antistatic agent, which is a hydrophilic polymer; when it is blended with the polymer matrix, on the one hand, due to the strong mobility of its molecular chain, it is easy for protons to move between molecules, and the static charge generated is conducted and released through ion conduction; on the other hand, the polymer permanent antistatic agent is distributed in a fine layer or tendon shape on the surface of the BOPP base layer, forming a conductive surface layer, and is distributed almost spherically in the center part, forming a "core-shell structure", and uses this as a path to leak static charge.

[0017] Furthermore, the attached textured layer is an antistatic layer laminated on the BOPP base layer by a casting roller, and the casting roller is a wire roller structure; the antistatic layer is made of the same material as the second antistatic layer. The casting roller is processed on the BOPP base layer to obtain an attached textured layer, at which time, the surface of the BOPP base layer is co-extruded by the wire roller to form a fine mesh structure, and finally, the external coating antistatic agent is coated on the attached textured layer, and the fine mesh structure can prevent the external coating antistatic agent from being scratched and separated from the film surface; before the external coating antistatic agent is coated, it is first prepared into a solution with a mass fraction of 0.5-2.0% with water or ethanol, and then attached to the surface of the attached textured layer by coating, spraying or dipping, and then dried at room temperature or with hot air to form the second antistatic layer.

[0018] Furthermore, the BOPP base layer is formed by extrusion and plasticization of polypropylene masterbatch.

[0019] Compared with the prior art, the antistatic BOPP composite film of the utility model adopts two different types of antistatic agents, namely, external coating type and internal mixing type. The internal mixing type antistatic agent is mainly used to conduct and release the static charge accumulated in the production process through ionic conduction; the external coating type antistatic agent is used to release the static charge generated by the friction of the film in the later application; at the same time, it can supplement the internal mixing type antistatic agent to prevent the local accumulation of static charge in the film due to uneven mixing; the overall antistatic effect is good, and the film adopts a sandwich co-extrusion method, which is thinner and convenient for later packaging and use. The various structural layers of the film are formed into one by co-extrusion casting, without the need for a glue coating process, and will not cause the peeling of the structural layers; and the first antistatic layer and the second antistatic layer can be protected by the surrounding edge to prevent the first antistatic layer and the second antistatic layer from peeling off on the sides, and the antistatic layer on the surface of the film can be formed into one. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the antistatic BOPP composite film of the utility model.

[0021] Figure 2 For the utility model Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0022] Figure 3 This is a schematic diagram of the overall structure of Example 1 of the antistatic BOPP composite film of the utility model.

[0023] Figure 4 For the utility model Figure 3 Schematic diagram of the local enlarged structure at point B in the middle.

[0024] Figure 5 This is a schematic diagram of the overall structure of Example 1 of the antistatic BOPP composite film of the utility model.

[0025] Figure 6 For the utility model Figure 5 Schematic diagram of the partial enlarged structure at point C in the middle.

[0026] Figure numerals: 1, BOPP base layer, 2, attachment textured layer, 3, surrounding edge, 4, first antistatic layer, 5, second antistatic layer, 6, printing layer, 7, antistatic base layer. DETAILED DESCRIPTION

[0027] Embodiment 1:

[0028] like Figure 1 and Figure 2 The antistatic BOPP composite film shown comprises:

[0029] BOPP base layer 1;

[0030] An attached textured layer 2, wherein the attached textured layer 2 is disposed on one side of the BOPP base layer 1;

[0031] The surrounding edges 3 are integrally formed on the two sides of the BOPP base layer 1; the attachment textured layer 2 is arranged between the surrounding edges 3; the surrounding edges 3 on the same side are pressed together into one body;

[0032] A first antistatic layer 4, which is filled and coated on the outer surface of the adhesion textured layer 2;

[0033] A second antistatic layer 5, which is co-extruded by a casting roller and arranged on the side of the BOPP base layer 1 away from the first antistatic layer 4; the thickness of the BOPP base layer 1 is 15-30 μm; the thickness of the first antistatic layer 4 and the second antistatic layer 5 is 5-8 μm;

[0034] The outer surfaces of the first antistatic layer 4 and the second antistatic layer 5 are flush with the outer surface of the surrounding edge 3;

[0035] The surrounding edge 3 and the second antistatic layer 5 are made of the same material; the first antistatic layer 4, the surrounding edge 3 and the second antistatic layer 5 are connected as a whole.

[0036] The BOPP base layer 1, the surrounding edge 3 and the second antistatic layer 5 can be melted and filtered, and enter the flow channel corresponding to the die head through the co-extrusion feed block; the BOPP base layer 1, the surrounding edge 3 and the second antistatic layer 5 are cast into one piece; then, the attached textured layer 2 is processed between the surrounding edges 3, and the first antistatic layer 4 is filled and coated on the attached textured layer 2; the surrounding edge 3 can protect the first antistatic layer 4 and the second antistatic layer 5; prevent the first antistatic layer 4 and the second antistatic layer 5 from peeling off from the side of the BOPP base layer 1; the surrounding edge 3 can connect the first antistatic layer 4 and the second antistatic layer 5 as a whole; the first antistatic layer 4, the surrounding edge 3 and the second antistatic layer 5 are conducted and release the generated static charge through ionic conduction.

[0037] The adhesion textured layer 2 is composed of an adhesion liquid, which is coated on the surface of the BOPP base layer 1 by an anilox roller and dried and solidified; the adhesion liquid is chlorinated polyacrylic acid resin or modified chlorinated polyethylene, and the adhesion liquid is rolled on the surface of the BOPP base layer 1 by an anilox roller, and after drying and solidification, the adhesion textured layer 2 can be obtained, so that the first antistatic layer 4 and the BOPP base layer 1 can be tightly combined; prevent the first antistatic layer 4 from peeling off from the surface of the BOPP base layer 1.

[0038] Embodiment 2:

[0039] like Figure 3 and Figure 4 In the antistatic BOPP composite film shown, a printing layer 6 is arranged between the BOPP base layer 1 and the attached anilox layer 2, and the printing layer 6 is covered by the attached anilox layer 2, which can prevent the first antistatic layer 4 from being damaged when the film is printed.

[0040] The attached textured layer 2 is a textured layer pressed onto the BOPP base layer 1 by a silk roller. The textured layer is obtained by silk-screening directly on the BOPP base layer 1. The externally coated antistatic agent is coated onto the attached textured layer 2. The fine mesh structure can prevent the externally coated antistatic agent from being scratched and detached from the film surface.

[0041] The first antistatic layer 4 is an external coating antistatic agent; the antistatic agent of the second antistatic layer 5 is a polymer permanent antistatic agent mixed and melted inside the carrier; the carrier is a polypropylene masterbatch; that is, the raw material of the second antistatic layer 5 adopts a polymer permanent antistatic agent, which is a hydrophilic polymer; when it is blended with the polymer matrix, on the one hand, due to the strong mobility of its molecular chain, it is easy for protons to move between molecules, and the static charge generated is conducted and released through ion conduction; on the other hand, the polymer permanent antistatic agent is distributed in a fine layer or tendon shape on the surface of the BOPP base layer 1, forming a conductive surface layer, and is distributed almost spherically in the center part, forming a "core-shell structure", and uses this as a path to leak static charge.

[0042] Embodiment 3:

[0043] like Figure 5 and Figure 6 In the antistatic BOPP composite film shown, the attached textured layer 2 is an antistatic base layer 7 pressed onto the BOPP base layer 1 by a casting roller, and the casting roller is a wire roller structure; the material of the antistatic base layer 7 is the same as that of the second antistatic layer 5. The casting roller processes the BOPP base layer 1 to obtain a layer of attached textured layer 2, at which time, the surface of the BOPP base layer 1 is co-extruded by the wire roller to form a fine mesh structure, and finally, the external coating antistatic agent is coated on the attached textured layer 2, and the fine mesh structure can prevent the external coating antistatic agent from being scratched and separated from the film surface; before coating the external coating antistatic agent, it is first prepared into a solution with a mass fraction of 0.5-2.0% with water or ethanol, and then attached to the surface of the attached textured layer 2 by coating, spraying or dipping, and then dried at room temperature or with hot air to form the second antistatic layer 5.

[0044] The BOPP base layer 1 is formed by extrusion and plasticization of polypropylene masterbatch.

[0045] The above embodiments are only preferred implementations of the present invention, so any equivalent changes or modifications made according to the structures, features and principles described in the scope of application of the present invention are included in the scope of application of the present invention.

Claims

1. An antistatic BOPP composite film, characterized in that: include: BOPP base layer; An attachment textured layer, wherein the attachment textured layer is arranged on one side of the BOPP base layer; The surrounding edges are integrally formed on the two sides of the BOPP base layer; the attachment textured layer is arranged between the surrounding edges; the surrounding edges on the same side are pressed together into one body; A first antistatic layer, which is filled and coated on the outer surface of the adhesion textured layer; A second antistatic layer, wherein the second antistatic layer is co-extruded on a side of the BOPP base layer away from the first antistatic layer by a casting roller; the thickness of the BOPP base layer is 15-30 μm; the thickness of the first antistatic layer and the second antistatic layer is 5-8 μm; The outer surfaces of the first antistatic layer and the second antistatic layer are flush with the outer surface of the surrounding edge; The surrounding edge and the second antistatic layer are made of the same material; the first antistatic layer, the surrounding edge and the second antistatic layer are connected as a whole.

2. The antistatic BOPP composite film according to claim 1, characterized in that: The adhesion anilox layer is composed of an adhesion liquid, which is coated by an anilox roller and dried and solidified on the surface of the BOPP base layer; the adhesion liquid is chlorinated polyacrylic acid resin or modified chlorinated polyethylene.

3. The antistatic BOPP composite film according to claim 2, characterized in that: A printing layer is arranged between the BOPP base layer and the attached textured layer.

4. The antistatic BOPP composite film according to claim 1, characterized in that: The attached textured layer is a textured layer pressed onto the BOPP base layer by a wire roller.

5. The antistatic BOPP composite film according to claim 1, characterized in that: The first antistatic layer is an external coating antistatic agent; the antistatic agent of the second antistatic layer is a high molecular permanent antistatic agent mixed and melted inside the carrier; and the carrier is a polypropylene masterbatch.

6. The antistatic BOPP composite film according to claim 1, characterized in that: The attached textured layer is an antistatic base layer pressed onto the BOPP base layer by a casting roller, and the casting roller is a wire roller structure; the antistatic base layer is made of the same material as the second antistatic layer.

7. The antistatic BOPP composite film according to claim 1, characterized in that: The BOPP base layer is formed by extruding and plasticizing a polypropylene masterbatch.

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