Double-sided antistatic PE protective film and preparation method thereof

Abstract

The invention discloses a double-sided antistatic PE protective film and a preparation method thereof.The protective film sequentially comprises a first antistatic coating, a film base material, a second antistatic coating and a glue layer from top to bottom, and when the protective film is prepared, the back face and the front face of the film base material are coated with the first antistatic coating and the second antistatic coating firstly, a PET release film is coated with glue, and then the first antistatic coating and the second antistatic coating are formed; and then compounding and rolling the PET release film and the protective film, and stripping the PET release film after curing to obtain the double-sided antistatic PE protective film. The PE protective film disclosed by the invention has excellent antistatic stability and adhesive force, the resistivity can reach 105 ohms, and the PE protective film can be used for a long time; meanwhile, the protective film is simple in preparation method, safe and environment-friendly, and raw materials are easy to obtain.

Description

Technical Field

[0001] The invention relates to the technical field of composite materials, and in particular to a double-sided antistatic PE protective film and a preparation method thereof. Background Art

[0002] With the advent of the multimedia era, electronic products such as monitors and televisions have entered thousands of households. During the long-term use of these electronic products, the monitors and TV screens often affect the screen quality due to static electricity, which in turn damages the internal electronic components. Due to the excellent properties of PE protective film (corrosion resistance, strong electrical insulation, etc.) and its relatively low price, it is widely used in materials such as fibers and films. In the field of electronic displays, antistatic PE protective film is also widely used. The existing antistatic protective film mainly has antistatic effect on one side (adhesive side). A layer of polythiophene antistatic coating is directly coated on the corona treated surface of the PE substrate, and then acrylic glue is coated on the antistatic coating. The back of the protective film is not treated and has no antistatic effect; or a layer of polythiophene antistatic coating is directly coated on the corona treated surface of the PE substrate, and then acrylic glue is coated on the antistatic coating. The antistatic treatment on the back is mostly achieved by adding antistatic masterbatch to the inner layer during the three-layer co-extrusion blown film production of the protective film substrate, and the antistatic effect is poor. In addition, acrylic glue is also coated on the antistatic substrate, and after baking at 90-100°C for about 1 minute and aging at 50-55°C / 48-72 hours, the antistatic effect of the back of the protective film will quickly decay or lose the antistatic effect after high temperature. In addition, the antistatic masterbatch added in the substrate will precipitate, which will affect the adhesion of the protective film and cause the protective film to produce marks or residues on the surface of the adhered product after being attached to the product.

[0003] CN105295762A discloses an antistatic ultra-thin double-sided adhesive tape, which is composed of an upper release film, a glue layer, a PET film layer, a glue layer and a lower release film layer from top to bottom. The glue layer is an antistatic polyacrylic acid glue layer, the thickness of the glue layer is 1-3 μm, and the thickness of the PET film layer is 1-12 μm. The antistatic polyacrylic acid glue layer contains the following components in weight percentage: polyacrylate glue 20-65%, solvent 30-80%, curing agent 2-10%, antistatic agent 0.1-0.5%. This technology applies the antistatic liquid on the PET film layer, and produces a synergistic effect with the antistatic agent in the upper and lower glue layers, so that the antistatic performance of the prepared double-sided adhesive is significantly improved, but this preparation method is easy to cause the antistatic effect on the back of the protective film to decay rapidly or lose the antistatic effect due to drying. CN113214515A discloses a front and back double-sided antistatic composite release film, which includes, from top to bottom, a front release agent coating, a front antistatic layer, a substrate original film layer, a back antistatic layer, and a back release agent coating. Both the front and back sides of the release film have antistatic functions to avoid charge accumulation on the release film, but the upper and lower layers are both release agents and do not contain a glue layer, so it is not easy to adhere to the surface of an electronic screen. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide a double-sided antistatic PE protective film and a preparation method thereof, so that its double-sided antistatic index can reach 10 5 -10 10 Ω and can be effective for a long time.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A double-sided antistatic PE protective film comprises, from top to bottom, a first antistatic coating, a film substrate, a second antistatic coating and a glue layer.

[0007] Preferably, the thickness of the first antistatic coating is 1.1-1.3 um, the thickness of the film substrate is 40-60 um, the thickness of the second antistatic coating is 0.8-1.0 um, and the thickness of the glue layer is 1.7-2.2 um.

[0008] Preferably, the total thickness of the double-sided antistatic PE protective film is controlled to be 48-60 um.

[0009] Preferably, the thickness of the first antistatic coating is 1.3 um, the thickness of the film substrate is 50 um, the thickness of the second antistatic coating is 0.8 um, and the thickness of the glue layer is 2.0 um.

[0010] The present invention also provides a method for preparing the above-mentioned double-sided antistatic PE protective film, which specifically comprises the following steps:

[0011] Step (1), during the blowing production of the PE film substrate, the front side is subjected to corona treatment to reach a dyne value of 40-42 and then rolled up normally, when the antistatic agent is coated, the back side of the film substrate is first subjected to corona treatment to make the surface dyne value of 40-42, the antistatic agent A is coated, and after drying at 90° C. for 1 minute, a film substrate having a first antistatic coating on the back side is obtained, and at this time, the surface dyne value of the first antistatic coating is 34-36;

[0012] Step (2), coating the front side of the film substrate with an antistatic agent B, and drying at 90° C. for 1 minute to obtain a film substrate coated with a second antistatic coating on the front side, wherein the surface dyne value of the second antistatic coating is 40-42;

[0013] Step (3), coating the glue on the release surface of the PET release film, and drying at 100° C. for 1 minute to obtain the PET release film glue layer;

[0014] Step (4), compounding the PET release film adhesive layer with the film substrate coated with the second antistatic layer in step (2) and then rolling it up, and peeling off the PET release film after aging to obtain a double-sided antistatic PE protective film.

[0015] Preferably, the antistatic agent A is made of polythiophene, water-dispersible polyurethane resin, nano-titanium dioxide, nickel chloride, isopropanol and deionized water, and the weight ratio of polythiophene, water-dispersible polyurethane resin, nano-titanium dioxide, nickel chloride, isopropanol and deionized water is (15-25): (40-60): (4-8): (1-1.5): (60-70): (60-70).

[0016] Preferably, the antistatic agent B is made of polythiophene, isopropanol and deionized water, and the weight ratio of polythiophene, isopropanol and deionized water is 1:(2-3):(2-3).

[0017] Preferably, the aging temperature in step (4) is 50° C.-55° C., and the aging time is 48-72 hours.

[0018] Preferably, the glue is acrylic glue.

[0019] Preferably, 2.5%-3% isocyanate curing agent is added to the acrylic glue.

[0020] It should be noted that the antistatic agent A and the antistatic agent B of the present invention have different formulas. After being coated on the upper and lower layers of the film substrate, the surface dyne values ​​are different. The surface dyne value of the antistatic agent A layer is 34-36, and the surface dyne value of the antistatic agent B layer is 40-42. When compounded with the adhesive layer coated on the PET release film, the adhesive layer will be completely transferred to the PE substrate, ensuring that the substrate and the adhesive layer have good adhesion and avoiding degumming.

[0021] The present invention provides a double-sided antistatic PE protective film which comprises a first antistatic coating, a film substrate, a second antistatic coating and a glue layer from top to bottom. The structure is simple, and the protective film prepared by the preparation method of the present invention has excellent double-sided conductive properties, and the resistivity can reach 10 5 -10 10 The PE protective film prepared by the present invention has stable adhesion, excellent adhesion, good re-peeling performance, and no residual adhesive phenomenon. It is widely used in organic sheets, instruments, display screens, glass lenses, plastic lenses, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a double-sided antistatic PE protective film (from top to bottom: the first antistatic coating, the film substrate, the second antistatic coating, and the glue layer). DETAILED DESCRIPTION

[0023] The technical solution of the present invention is described in detail below in conjunction with the specific embodiments of the present invention. However, it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0024] The first object of the present invention is to provide a double-sided antistatic PE protective film, which has excellent antistatic effect, and the double-sided antistatic index can reach 10 5 -10 10 Ω, and can be effective for a long time.

[0025] like Figure 1 As shown, the double-sided antistatic PE protective film designed by the present invention is composed of a first antistatic coating, a film substrate, a second antistatic coating, and a glue layer from top to bottom. The thickness of the first antistatic coating is 1.1-1.3um, the thickness of the film substrate is 40-60um, the thickness of the second antistatic coating is 0.8-1.0um, and the thickness of the glue layer is 1.7-2.2um. The total thickness of the double-sided antistatic PE protective film is 48-60um.

[0026] The second purpose of the present invention is to provide a method for preparing a double-sided antistatic PE protective film. The method is simple and the raw materials are readily available. It overcomes the traditional method of directly coating glue on the base film and can avoid the problem of the glue reacting with the antistatic agent and losing the antistatic index before it is completely cross-linked and cured.

[0027] Example 1

[0028] The double-sided antistatic PE protective film M1 includes, from top to bottom, a first antistatic coating, a film substrate, a second antistatic coating, and a glue layer. The thickness of the first antistatic coating is 1.3um, the thickness of the film substrate is 50um, the thickness of the second antistatic coating is 0.8um, and the thickness of the glue layer is 2.0um.

[0029] When preparing the protective film M1, first prepare the antistatic agent A: polythiophene, water-dispersible polyurethane resin, nano-titanium dioxide, nickel chloride, isopropyl alcohol and deionized water are evenly stirred in a weight ratio of 15:40:4:1:60:60, and stirred continuously at 200 r / min for 10 min, then the speed is increased to 400 r / min and stirring is continued for 20 min.

[0030] Secondly, prepare antistatic agent B: stir polythiophene, isopropanol and deionized water in a weight ratio of 1:2:2, with a stirring speed of 400 r / min, and stir continuously for 30 minutes.

[0031] First, the back of the PE protective film is subjected to corona treatment, and then antistatic agent A is coated on it. The PE protective film coated with antistatic agent A is placed in a coating oven at 90°C for drying for 1 minute and then rolled into a large roll. After rewinding, antistatic agent B is coated on the other side of the PE protective film, and it is dried in a coating oven at 90°C for 1 minute again. Finally, it is rolled into a large roll to obtain a PE protective film coated with antistatic agent on both sides.

[0032] Acrylic glue containing 2.5% isocyanate curing agent is coated on the release surface of the PET release film, and the PET release film is dried in a coating oven at 100°C for 1 minute to obtain the adhesive layer of the PET release film. When the PET release film is taken out, the PET release film covering the adhesive layer is compounded with one side of the PE protective film coated with an antistatic agent B and then rolled up. It is placed at 50°C for 48 hours. Finally, the PET release film is peeled off and rewound to obtain a double-sided antistatic PE protective film M1.

[0033] Example 2

[0034] The double-sided antistatic PE protective film M2 is composed of the first antistatic coating, the film substrate, the second antistatic coating, and the glue layer from top to bottom. The thickness of the first antistatic coating is 1.3um, the thickness of the film substrate is 50um, the thickness of the second antistatic coating is 0.8um, and the thickness of the glue layer is 2.0um.

[0035] The method for preparing the protective film is the same as that in Example 1, except that the ratio of the antistatic agent B is polythiophene, isopropyl alcohol and deionized water in a weight ratio of 1:2.5:2.5.

[0036] Example 3

[0037] The double-sided antistatic PE protective film M3 is composed of the first antistatic coating, the film substrate, the second antistatic coating, and the glue layer from top to bottom. The thickness of the first antistatic coating is 1.3um, the thickness of the film substrate is 50um, the thickness of the second antistatic coating is 0.8um, and the thickness of the glue layer is 2.0um.

[0038] The method for preparing the protective film M3 is the same as that in Example 1, except that the ratio of the antistatic agent A is polythiophene, water-dispersible polyurethane resin, nano-titanium dioxide, nickel chloride, isopropyl alcohol and deionized water in a weight ratio of 20:40:6:1.5:70:70.

[0039] Example 4

[0040] The double-sided antistatic PE protective film M4 is composed of the first antistatic coating, the film substrate, the second antistatic coating, and the glue layer from top to bottom. The thickness of the first antistatic coating is 1.3um, the thickness of the film substrate is 50um, the thickness of the second antistatic coating is 0.8um, and the thickness of the glue layer is 2.0um.

[0041] The method for preparing the protective film is the same as that in Example 1, except that the ratio of the antistatic agent B is polythiophene, isopropyl alcohol and deionized water in a weight ratio of 1:3:3.

[0042] Example 5

[0043] The double-sided antistatic PE protective film M5 is composed of the first antistatic coating, the film substrate, the second antistatic coating, and the glue layer from top to bottom. The thickness of the first antistatic coating is 1.3um, the thickness of the film substrate is 50um, the thickness of the second antistatic coating is 0.8um, and the thickness of the glue layer is 2.0um.

[0044] The method for preparing the protective film M5 is the same as that of Example 1, except that the ratio of the antistatic agent A is polythiophene, water-dispersible polyurethane resin, nano-titanium dioxide, nickel chloride, isopropyl alcohol and deionized water in a weight ratio of 15:40:4:1:65:65.

[0045] The prepared protective films M1-M5 were subjected to performance testing, and the results obtained are shown in Table 1 below:

[0046] Table 1

[0047]

[0048] Through the performance test of the protective films M1-M5 prepared in the above embodiments, it is found that the resistivity of the protective films prepared by the technical solution of the present invention can reach 10 5 -10 10 , the peel strength is 20-22g / mm, it has excellent antistatic stability and adhesion, the antistatic agent formula is simple to prepare, and the peel strength is stable.

[0049] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A double-sided antistatic PE protective film, characterized in that: From top to bottom, it is composed of a first antistatic coating, a film substrate, a second antistatic coating, and a glue layer; The thickness of the first antistatic coating is 1.1-1.3um, the thickness of the film substrate is 40-60um, the thickness of the second antistatic coating is 0.8-1.0um, and the thickness of the glue layer is 1.7-2.2um; The total thickness of the double-sided antistatic PE protective film is 48-60um.

2. The double-sided antistatic PE protective film according to claim 1, characterized in that: The thickness of the first antistatic coating is 1.3 um, the thickness of the film substrate is 50 um, the thickness of the second antistatic coating is 0.8 um, and the thickness of the glue layer is 2.0 um.

3. The method for preparing a double-sided antistatic PE protective film according to claim 1, characterized in that: The following steps are involved: S1. During the blowing production of PE film substrate, the front side is subjected to corona treatment to reach a dyne value of 40-42, and then the film substrate is rolled normally. When the antistatic agent is applied, the back side of the film substrate is first subjected to corona treatment to make the surface dyne value of 40-42, and then the antistatic agent A is applied. After drying at 90°C for 1 minute, the film substrate with the first antistatic coating on the back side is obtained, and the surface dyne value of the first antistatic coating is 34-36; S2. The front side of the film substrate obtained in step S1 is coated with an antistatic agent B, and after drying at 90°C for 1 minute, a film substrate coated with a second antistatic coating on the front side is obtained, and the surface dyne value of the second antistatic coating is 40-42; S3. Apply the glue on the release surface of the PET release film and dry it at 100°C for 1 minute to obtain the PET release film adhesive layer; S4. Compounding the PET release film adhesive layer with the film substrate coated with the second antistatic coating on the front side and then rolling it up, peeling off the PET release film after aging to obtain a double-sided antistatic PE protective film.

4. The preparation method according to claim 3, characterized in that: The antistatic agent A is made of polythiophene, water-dispersible polyurethane resin, nano titanium dioxide, nickel chloride, isopropanol and deionized water, and the weight ratio of polythiophene, water-dispersible polyurethane resin, nano titanium dioxide, nickel chloride, isopropanol and deionized water is (15-25): (40-60): (4-8): (1-1.5): (60-70): (60-70).

5. The preparation method according to claim 3, characterized in that: The antistatic agent B is made of polythiophene, isopropanol and deionized water, and the weight ratio of polythiophene, isopropanol and deionized water is 1:(2-3):(2-3).

6. The preparation method according to claim 3, characterized in that: The aging temperature in step S4 is 50° C.-55° C., and the aging time is 48-72 hours.

7. The preparation method according to claim 5, characterized in that: The weight ratio of the polythiophene, isopropanol and deionized water is 1:2:

2.

8. The preparation method according to claim 4, characterized in that: The weight ratio of the polythiophene, the water-dispersible polyurethane resin, the nano-titanium dioxide, the nickel chloride, the isopropanol and the deionized water is 15:40:4:1:60:

60.

9. The preparation method according to claim 3, characterized in that: The glue in step S3 is acrylic glue.

10. The preparation method according to claim 9, characterized in that: 2.5%-3% of isocyanate curing agent is added to the acrylic glue.

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