PET embossed film and manufacturing method thereof
By introducing materials such as polyurethane, silica sol, modified inorganic fillers, and modified carbon nanotubes into PET embossed film, the contradiction between light transmittance and antistatic properties of PET embossed film is resolved, improving both light transmittance and antistatic properties, and adapting to the flexibility requirements of small-batch orders.
Patent Information
- Application Number
- CN202511087253.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-05
- Publication Date
- 2025-11-11
AI Technical Summary
There is a contradiction between light transmittance and antistatic properties in existing PET embossed films. Traditional antistatic coatings lead to increased light scattering and decreased light transmittance, and traditional processes are not suitable for small-batch orders due to their lack of flexibility and economy.
A PET embossed film is prepared by using a structural design in which the upper surface layer contains polyurethane and silica sol, the lower surface layer contains PET and modified inorganic fillers, and the core layer contains PET, dispersant and modified carbon nanotubes, through blending, extrusion, casting, stretching, coating and embossing.
This achieves a synergistic improvement in the high light transmittance and antistatic properties of PET embossed film, meeting the flexibility requirements of small-batch orders.
Smart Images
Figure SMS_1
Abstract
Description
Technical Field
[0001] This invention relates to the field of embossing film technology, and more particularly to a PET embossing film and its manufacturing method. Background Technology
[0002] PET embossing film, officially known as polyethylene terephthalate embossing film, is a polymer material with excellent physical and chemical properties. In the field of electronic component protection, PET embossing film has become an indispensable functional material due to its accurate texture replication ability and stable peel performance. However, physical embossing can easily lead to texture distortion. When release agent is applied to the embossed surface, the liquid material naturally flows into the recessed texture, causing partial filling of fine structures and affecting the final transfer effect. For small-batch orders requiring frequent texture changes, traditional processes clearly lack flexibility and economy, becoming a major obstacle to industry innovation. Furthermore, while antistatic properties in PET embossing film can prevent dust adsorption and improve yield, there is currently a contradiction between light transmittance and antistatic properties. Traditional antistatic coatings tend to increase light scattering, causing light transmittance to drop below 85%. Summary of the Invention
[0003] Based on the technical problems existing in the background art, the present invention proposes a PET embossed film and its manufacturing method.
[0004] The present invention proposes a PET embossed film, comprising an upper surface layer, a core layer, and a lower surface layer; the upper surface layer comprises polyurethane and silica sol; the lower surface layer comprises PET and modified inorganic filler; and the core layer comprises PET, dispersant, and modified carbon nanotubes.
[0005] Preferably, the upper surface layer comprises, by weight, 5-15 parts polyurethane and 0.5-2 parts silica sol.
[0006] Preferably, the polyurethane is a polyurethane with a melting point of 70-120°C.
[0007] Preferably, the mass fraction of silica in the silica sol is 10wt%-20wt%.
[0008] Preferably, the silica particles in the silica sol have a particle size of 10-100 nm.
[0009] Preferably, the lower surface layer comprises, by weight, 20 parts PET and 0.01-0.1 parts modified inorganic filler.
[0010] Preferably, the preparation method of the modified inorganic filler includes the following steps: mixing the silane coupling agent solution and the inorganic filler evenly, adding acid solution dropwise, heating and refluxing to react, washing and drying to obtain the filler.
[0011] More preferably, the acid solution is selected from one or more of citric acid solution and oxalic acid solution.
[0012] More preferably, the concentration of the acid solution is 1wt%-3wt%.
[0013] More preferably, the mass ratio of the silane coupling agent solution, the inorganic filler, and the acid solution is 100:(50-60):(50-70).
[0014] More preferably, the silane coupling agent is selected from one or more of γ-aminopropyltriethoxysilane and γ-methacryloyloxypropyltrimethoxysilane.
[0015] More preferably, the concentration of the silane coupling agent solution is 2wt%-5wt%.
[0016] More preferably, the heating temperature is 50-60°C.
[0017] More preferably, the reflux reaction time is 0.5-2 hours.
[0018] More preferably, the inorganic filler is selected from one or more of silica, kaolin, diatomaceous earth, montmorillonite, and talc.
[0019] Preferably, the core layer comprises, by weight, 50-80 parts PET, 1-3 parts dispersant, and 0.1-0.5 parts modified carbon nanotubes.
[0020] More preferably, the dispersant is selected from one or more of polyethylene glycol and polyvinylpyrrolidone.
[0021] More preferably, the method for preparing the modified carbon nanotubes includes the following steps: mixing carbon nanotubes, dodecyltrimethoxysilane, methanol, and water, grinding, washing, and drying to obtain modified carbon nanotubes.
[0022] More preferably, the mass ratio of the carbon nanotubes, dodecyltrimethoxysilane, methanol, and water is 1:(0.5-1):(1-5):10.
[0023] Preferably, the total thickness of the PET embossed film is 30-100μm, and the thickness ratio of the upper surface layer, the core layer, and the lower surface layer is (1-2):(3-4):1.
[0024] This invention also proposes a method for manufacturing a PET embossed film, comprising the following steps:
[0025] S1. The raw materials of the core layer and the lower surface layer are blended, extruded, cast, and stretched to obtain a sheet material;
[0026] S2. After heating and mixing the raw materials on the upper surface, coat them onto the core layer of the sheet and dry them to obtain a base film.
[0027] S3. Embossed the base film to obtain a PET embossed film.
[0028] Preferably, in S1, the blending temperature is 210-240℃.
[0029] Preferably, in S1, the extrusion temperature is 210-270℃.
[0030] Preferably, in S1, the casting sheet is a casting sheet cooled by passing water at 15-20°C through it.
[0031] Preferably, in S1, the stretching includes longitudinal stretching and transverse stretching.
[0032] More preferably, the longitudinal stretching temperature is 80-100℃, and the longitudinal stretching ratio is 2-4; the transverse stretching temperature is 110-120℃, and the transverse stretching ratio is 3-5.
[0033] Preferably, in step S2, the heating temperature is 120-150℃.
[0034] Preferably, in step S2, the coating is performed by spin coating uniformly onto the surface of the sheet.
[0035] More preferably, the spin coating method has a rotation speed of 4000-5000 rpm.
[0036] Preferably, in S3, the embossing temperature of the embossing process is 100-160℃; the linear pressure is 60-80N / mm.
[0037] The beneficial effects of this invention are as follows:
[0038] This invention proposes a PET embossed film, comprising an upper surface layer, a core layer, and a lower surface layer. The upper surface layer comprises polyurethane and silica sol; the lower surface layer comprises PET and modified inorganic fillers; and the core layer comprises PET, a dispersant, and modified carbon nanotubes. The synergistic effect of the raw materials in the upper surface layer, core layer, and lower surface layer results in a PET embossed film with excellent light transmittance and antistatic properties. Detailed Implementation
[0039] The technical solution of the present invention will be described in detail through specific embodiments.
[0040] Unless otherwise specified, all materials and reagents used in the following examples are commercially available.
[0041] Example 1
[0042] A PET embossed film includes an upper surface layer, a core layer, and a lower surface layer. The upper surface layer, by weight, comprises 12 parts polyurethane with a melting point of 95°C and 1 part 15 wt% silica sol (silica particle size of 10 nm). The lower surface layer, by weight, comprises 20 parts PET and 0.06 parts modified inorganic filler. The core layer, by weight, comprises 65 parts PET, 2 parts polyethylene glycol, and 0.3 parts modified carbon nanotubes. The thickness ratio of the upper surface layer, core layer, and lower surface layer is 1:3:1.
[0043] The preparation method of the modified inorganic filler includes the following steps: 3wt% γ-methacryloxypropyltrimethoxysilane solution, silica, and montmorillonite are mixed evenly, 1wt% citric acid solution is added dropwise, and the mixture is heated under reflux at 55℃ for 1 hour, washed and dried to obtain the filler; wherein the mass ratio of γ-methacryloxypropyltrimethoxysilane solution, silica, montmorillonite, and citric acid solution is 10:3:2:5.
[0044] The method for preparing modified carbon nanotubes includes the following steps: mixing carbon nanotubes, dodecyltrimethoxysilane, methanol, and water in a mass ratio of 1:1:3:10, grinding, washing, and drying to obtain modified carbon nanotubes.
[0045] A method for manufacturing a PET embossed film includes the following steps:
[0046] S1. The raw materials of the core layer and the lower surface layer are blended at 220℃, extruded at 265℃, cooled and cast into sheets by passing water at 20℃, and then stretched in both directions. The longitudinal stretching temperature is 90℃ and the longitudinal stretching ratio is 2.5; the transverse stretching temperature is 120℃ and the transverse stretching ratio is 3.5 to obtain the sheet material.
[0047] S2. After heating and mixing the raw materials on the upper surface at 120°C, the mixture is evenly coated onto the core layer of the sheet using a spin coating method, and then dried to obtain a base film.
[0048] S3. Emboss the base film at a temperature of 100℃ and a linear pressure of 70N / mm to obtain a PET embossed film.
[0049] Example 2
[0050] A PET embossed film includes an upper surface layer, a core layer, and a lower surface layer. The upper surface layer, by weight, comprises 12 parts polyurethane with a melting point of 95°C and 0.8 parts 15 wt% silica sol (silica particle size of 10 nm). The lower surface layer, by weight, comprises 20 parts PET and 0.04 parts modified inorganic filler. The core layer, by weight, comprises 65 parts PET, 2 parts polyethylene glycol, and 0.25 parts modified carbon nanotubes. The thickness ratio of the upper surface layer, core layer, and lower surface layer is 1:3:1.
[0051] The preparation method of the modified inorganic filler includes the following steps: 3wt% γ-methacryloxypropyltrimethoxysilane solution, silica, and montmorillonite are mixed evenly, 1wt% citric acid solution is added dropwise, and the mixture is heated under reflux at 55℃ for 1 hour, washed and dried to obtain the filler; wherein the mass ratio of γ-methacryloxypropyltrimethoxysilane solution, silica, montmorillonite, and citric acid solution is 10:3:2:5.
[0052] The method for preparing modified carbon nanotubes includes the following steps: mixing carbon nanotubes, dodecyltrimethoxysilane, methanol, and water in a mass ratio of 1:1:3:10, grinding, washing, and drying to obtain modified carbon nanotubes.
[0053] A method for manufacturing a PET embossed film includes the following steps:
[0054] S1. The raw materials of the core layer and the lower surface layer are blended at 220℃, extruded at 265℃, cooled and cast into sheets by passing water at 15℃, and then stretched in both directions. The longitudinal stretching temperature is 90℃ and the longitudinal stretching ratio is 2.5; the transverse stretching temperature is 120℃ and the transverse stretching ratio is 3.5 to obtain the sheet material.
[0055] S2. After heating and mixing the raw materials on the upper surface at 120°C, the mixture is evenly coated onto the core layer of the sheet using a spin coating method, and then dried to obtain a base film.
[0056] S3. Emboss the base film at a temperature of 100℃ and a linear pressure of 70N / mm to obtain a PET embossed film.
[0057] Example 3
[0058] A PET embossed film includes an upper surface layer, a core layer, and a lower surface layer. The upper surface layer, by weight, comprises 10 parts polyurethane with a melting point of 95°C and 1 part 15 wt% silica sol (silica particle size of 10 nm). The lower surface layer, by weight, comprises 20 parts PET and 0.05 parts modified inorganic filler. The core layer, by weight, comprises 65 parts PET, 2 parts polyethylene glycol, and 0.25 parts modified carbon nanotubes. The thickness ratio of the upper surface layer, core layer, and lower surface layer is 1:3:1.
[0059] The preparation method of the modified inorganic filler includes the following steps: 3wt% γ-methacryloxypropyltrimethoxysilane solution, silica, and montmorillonite are mixed evenly, 1wt% citric acid solution is added dropwise, and the mixture is heated under reflux at 55℃ for 1 hour, washed and dried to obtain the filler; wherein the mass ratio of γ-methacryloxypropyltrimethoxysilane solution, silica, montmorillonite, and citric acid solution is 10:3:2:5.
[0060] The method for preparing modified carbon nanotubes includes the following steps: mixing carbon nanotubes, dodecyltrimethoxysilane, methanol, and water in a mass ratio of 1:1:3:10, grinding, washing, and drying to obtain modified carbon nanotubes.
[0061] A method for manufacturing a PET embossed film includes the following steps:
[0062] S1. The raw materials of the core layer and the lower surface layer are blended at 220℃, extruded at 265℃, cooled and cast into sheets by passing water at 20℃, and then stretched in both directions. The longitudinal stretching temperature is 85℃ and the longitudinal stretching ratio is 3; the transverse stretching temperature is 120℃ and the transverse stretching ratio is 4, to obtain the sheet material.
[0063] S2. After heating and mixing the raw materials on the upper surface at 120°C, the mixture is evenly coated onto the core layer of the sheet using a spin coating method, and then dried to obtain a base film.
[0064] S3. Emboss the base film at a temperature of 100℃ and a linear pressure of 65N / mm to obtain a PET embossed film.
[0065] Example 4
[0066] A PET embossed film includes an upper surface layer, a core layer, and a lower surface layer. The upper surface layer, by weight, comprises 12 parts polyurethane with a melting point of 95°C and 0.8 parts 15 wt% silica sol (silica particle size 10 nm). The lower surface layer, by weight, comprises 20 parts PET and 0.06 parts modified inorganic filler. The core layer, by weight, comprises 65 parts PET, 2 parts polyethylene glycol, and 0.3 parts modified carbon nanotubes. The thickness ratio of the upper surface layer, core layer, and lower surface layer is 1:3:1.
[0067] The preparation method of the modified inorganic filler includes the following steps: 3wt% γ-methacryloxypropyltrimethoxysilane solution, silica, and montmorillonite are mixed evenly, 1wt% citric acid solution is added dropwise, and the mixture is heated under reflux at 55℃ for 1 hour, washed and dried to obtain the filler; wherein the mass ratio of γ-methacryloxypropyltrimethoxysilane solution, silica, montmorillonite, and citric acid solution is 10:3:2:5.
[0068] The method for preparing modified carbon nanotubes includes the following steps: mixing carbon nanotubes, dodecyltrimethoxysilane, methanol, and water in a mass ratio of 1:1:3:10, grinding, washing, and drying to obtain modified carbon nanotubes.
[0069] A method for manufacturing a PET embossed film includes the following steps:
[0070] S1. The raw materials of the core layer and the lower surface layer are blended at 220℃, extruded at 265℃, cooled and cast into sheets by passing water at 15℃, and then stretched in both directions. The longitudinal stretching temperature is 80℃ and the longitudinal stretching ratio is 2.5; the transverse stretching temperature is 115℃ and the transverse stretching ratio is 3.5 to obtain the sheet material.
[0071] S2. After heating and mixing the raw materials on the upper surface at 120°C, the mixture is evenly coated onto the core layer of the sheet using a spin coating method, and then dried to obtain a base film.
[0072] S3. Emboss the base film at a temperature of 105℃ and a linear pressure of 65N / mm to obtain a PET embossed film.
[0073] Example 5
[0074] A PET embossed film includes an upper surface layer, a core layer, and a lower surface layer. The upper surface layer, by weight, comprises 10 parts polyurethane with a melting point of 95°C and 0.5 parts 15 wt% silica sol (silica particle size of 10 nm). The lower surface layer, by weight, comprises 20 parts PET and 0.06 parts modified inorganic filler. The core layer, by weight, comprises 63 parts PET, 1.5 parts polyethylene glycol, and 0.3 parts modified carbon nanotubes. The thickness ratio of the upper surface layer, core layer, and lower surface layer is 1:3:1.
[0075] The preparation method of the modified inorganic filler includes the following steps: 3wt% γ-methacryloxypropyltrimethoxysilane solution, silica, and montmorillonite are mixed evenly, 1wt% citric acid solution is added dropwise, and the mixture is heated under reflux at 55℃ for 1 hour, washed and dried to obtain the filler; wherein the mass ratio of γ-methacryloxypropyltrimethoxysilane solution, silica, montmorillonite, and citric acid solution is 10:4:1:5.
[0076] The method for preparing modified carbon nanotubes includes the following steps: mixing carbon nanotubes, dodecyltrimethoxysilane, methanol, and water in a mass ratio of 1:1:3:10, grinding, washing, and drying to obtain modified carbon nanotubes.
[0077] A method for manufacturing a PET embossed film includes the following steps:
[0078] S1. The raw materials of the core layer and the lower surface layer are blended at 220℃, extruded at 265℃, cooled and cast into sheets by passing water at 15℃, and then stretched in both directions. The longitudinal stretching temperature is 90℃ and the longitudinal stretching ratio is 2.5; the transverse stretching temperature is 115℃ and the transverse stretching ratio is 3.5 to obtain the sheet material.
[0079] S2. After heating and mixing the raw materials on the upper surface at 120°C, the mixture is evenly coated onto the core layer of the sheet using a spin coating method, and then dried to obtain a base film.
[0080] S3. Emboss the base film at a temperature of 100℃ and a linear pressure of 65N / mm to obtain a PET embossed film.
[0081] The transmittance, haze, and surface resistivity of the above-mentioned PET embossed film were tested. Transmittance / haze: The transmittance / haze of the PET embossed film was measured using a WGT-S type transmittance / haze meter; Surface resistivity: The surface resistivity was measured using an ACL-385 surface resistivity tester. The test results are shown in Table 1.
[0082] Table 1
[0083]
[0084] As can be seen from the data in Table 1, the PET embossed film prepared by the present invention has high light transmittance and low surface resistivity, indicating that the PET embossed film prepared by the present invention simultaneously satisfies high light transmittance and antistatic properties.
[0085] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A PET embossed film, characterized in that, It includes an upper surface layer, a core layer, and a lower surface layer; the upper surface layer includes polyurethane and silica sol; the lower surface layer includes PET and modified inorganic fillers; the core layer includes PET, dispersant, and modified carbon nanotubes.
2. The PET embossed film according to claim 1, characterized in that, The upper surface layer, by weight, comprises 5-15 parts polyurethane and 0.5-2 parts silica sol.
3. The PET embossed film according to claim 1 or 2, characterized in that, The polyurethane is a polyurethane with a melting point of 70-120℃; the mass fraction of silica in the silica sol is 10wt%-20wt%; and the particle size of silica in the silica sol is 10-100nm.
4. The PET embossed film according to claim 1, characterized in that, The lower surface layer, by weight, comprises 20 parts PET and 0.01-0.1 parts modified inorganic filler.
5. The PET embossed film according to claim 1 or 4, characterized in that, The method for preparing the modified inorganic filler includes the following steps: mixing the silane coupling agent solution and the inorganic filler evenly, adding an acid solution dropwise, heating and refluxing to react, washing and drying to obtain the filler.
6. The PET embossed film according to claim 5, characterized in that, The acid solution is selected from one or more of citric acid solution and oxalic acid solution; the mass ratio of silane coupling agent solution, inorganic filler and acid solution is 100:(50-60):(50-70); the heating temperature is 50-60℃; the inorganic filler is selected from one or more of silica, kaolin, diatomaceous earth, montmorillonite and talc.
7. The PET embossed film according to claim 1, characterized in that, The core layer, by weight, comprises 50-80 parts PET, 1-3 parts dispersant, and 0.1-0.5 parts modified carbon nanotubes.
8. The PET embossed film according to claim 1 or 7, characterized in that, The method for preparing the modified carbon nanotubes includes the following steps: mixing carbon nanotubes, dodecyltrimethoxysilane, methanol, and water, grinding, washing, and drying to obtain modified carbon nanotubes; the mass ratio of carbon nanotubes, dodecyltrimethoxysilane, methanol, and water is 1:(0.5-1):(1-5):
10.
9. A method for manufacturing a PET embossed film according to any one of claims 1-8, characterized in that, Includes the following steps: S1. The raw materials of the core layer and the lower surface layer are blended, extruded, cast, and stretched to obtain a sheet material; S2. After heating and mixing the raw materials on the upper surface, coat them onto the core layer of the sheet and dry them to obtain a base film. S3. Embossed the base film to obtain a PET embossed film.
10. The manufacturing method according to claim 9, characterized in that, In S3, the embossing temperature is 100-160℃; the linear pressure is 60-80 N / mm.