Pearlescent polypropylene aluminized film and method for preparing the same

Abstract

This invention relates to the field of plastic film technology, and more specifically to a pearlescent polypropylene aluminized film and its preparation method. The pearlescent polypropylene aluminized film comprises, from the inside out, an aluminized layer A, a corona layer B, a support layer C, a support layer D, and a pearlescent layer E; the mass ratio of the aluminized layer A, corona layer B, support layer C, support layer D, and pearlescent layer E is (0.1-0.25):(15.75-15.9):(31-32):(31-31):(20-22); the prepared pearlescent polypropylene aluminized film upgrades the traditional four-layer structure to a five-layer structure, achieving a special composite appearance of pearlescent and aluminized coatings; this pearlescent polypropylene aluminized film can be directly applied as a single layer, saving downstream color printing companies the printing process of pearlescent inks, simplifying the process, and saving costs; at the same time, it completely solves the problem of solvent residue in the printing process, making it more environmentally friendly.

Description

Technical Field

[0001] This invention relates to the field of plastic film technology, and more specifically to a pearlescent polypropylene aluminum-coated film and its preparation method. Background Technology

[0002] Pearlescent and aluminized finishes are special forms of acrylic films, offering significantly different appearances from ordinary glossy polypropylene films. In some applications, a combination of pearlescent and aluminized finishes is required. The current mainstream technical solution involves using aluminized polypropylene film as a printing material and printing a layer of pearlescent ink on its surface. However, during the final heat-sealing and bag-making process, the pearlescent ink is prone to peeling off, causing appearance defects.

[0003] Therefore, in view of the above problems, the present invention will provide a pearlescent polypropylene aluminum-coated film and a method for preparing the same. Summary of the Invention

[0004] The purpose of this invention is to provide a pearlescent polypropylene aluminized film and its preparation method to solve the above-mentioned problems. The pearlescent polypropylene aluminized film provided by this invention upgrades the traditional four-layer structure to a five-layer structure, achieving a special composite appearance of pearlescent and aluminized coating. This pearlescent polypropylene aluminized film can be directly applied as a single layer, saving downstream color printing companies the printing process of pearlescent ink, simplifying the process and saving costs. At the same time, it completely solves the problem of solvent residue in the printing process, making it more environmentally friendly.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0006] The first aspect of the present invention provides a pearlescent polypropylene aluminized film, comprising, from the inside out, an aluminized layer A, a corona layer B, a support layer C, a support layer D, and a pearlescent layer E; wherein the mass ratio of the aluminized layer A, the corona layer B, the support layer C, the support layer D, and the pearlescent layer E is (0.1-0.25):(15.75-15.9):(31-32):(31-31):(20-22).

[0007] Furthermore, the raw material for preparing the aluminum plating layer A includes metallic aluminum; the thickness of the aluminum plating layer A is 50nm to 60nm.

[0008] Furthermore, the raw materials for preparing the corona layer B include ternary copolymer polypropylene and open-face masterbatch; the ternary copolymer polypropylene is selected from FL7540L and / or RD265CF; the open-face masterbatch is selected from AB6089 and / or AB602LT; the mass ratio of the ternary copolymer polypropylene to the open-face masterbatch is 100:(2-2.5).

[0009] Furthermore, the raw materials for preparing the support layer C include homopolymer polypropylene HP510M and / or homopolymer polypropylene HD601CF.

[0010] Furthermore, the raw material for preparing the support layer D includes homopolymer polypropylene HD601CF.

[0011] Furthermore, the raw materials for preparing the pearlescent layer E include ternary copolymer polypropylene and pearlescent masterbatch; the ternary copolymer polypropylene is selected from FL7642 and / or SFC-750M; the pearlescent masterbatch is selected from PBR-1933; the mass ratio of the ternary copolymer polypropylene to the pearlescent masterbatch is 100:(20-30).

[0012] Furthermore, the thickness of the pearlescent polypropylene film is 20μm-80μm.

[0013] The second aspect of the present invention provides a method for preparing a pearlescent polypropylene aluminum-coated film, comprising: extruding the raw materials for preparing corona layer B, support layer C, support layer D and pearlescent layer E to obtain a pearlescent polypropylene film, and then electroplating the raw materials for preparing aluminum-coated layer A.

[0014] Furthermore, the extrusion temperature is 190℃~235℃; and / or the extrusion pressure is 10MPa~15MPa.

[0015] The method for preparing the above-mentioned pearlescent polypropylene aluminum-coated film of the present invention specifically includes the following steps:

[0016] Step 1: Material preparation: Prepare the raw materials for the aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E according to the mass ratio, and set them aside.

[0017] Step 2, Loading: Load the corona layer B, support layer C, support layer D and pearlescent layer E raw materials prepared in Step 1 into the hoppers of extruder I, extruder II, extruder III and extruder IV respectively.

[0018] Step 3: Preparation of pearlescent polypropylene film: The extruders are set to temperatures in a gradient of 190℃, 200℃, 200℃, 200℃, 210℃, 210℃, 210℃, 220℃, 220℃, 230℃, 230℃, 230℃, 235℃, 235℃, and 235℃. Under a pressure of 10MPa to 15MPa, the raw materials in the hoppers of extruders I, II, III, and IV are extruded through a T-die. After cooling, corona treatment, traction, and winding, pearlescent polypropylene film is obtained.

[0019] Step 4: Preparation of pearlescent polypropylene aluminum-coated film: The raw material for preparing pearlescent layer A is deposited on the inner side of the pearlescent polypropylene film by vacuum evaporation process to obtain the pearlescent polypropylene aluminum-coated film.

[0020] Beneficial effects:

[0021] The pearlescent polypropylene aluminized film prepared by this invention upgrades the traditional four-layer structure to a five-layer structure, achieving a unique composite appearance of pearlescent and aluminized coating (the traditional pearlescent aluminized film structure is as follows: BOPP / pearlescent ink / VMCPP, that is, a layer of pearlescent ink is printed on BOPP and then a layer of aluminized VMCPP film is laminated with adhesive); this pearlescent polypropylene aluminized film can be directly applied as a single layer, saving downstream color printing companies the process of printing pearlescent ink, simplifying the process and saving costs; at the same time, it completely solves the problem of solvent residue in the printing process, making it more environmentally friendly.

[0022] The pearlescent polypropylene aluminized film prepared by this invention has a simple preparation method, abundant and inexpensive raw material sources, and low production costs, making it suitable for large-scale industrial production. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the pearlescent polypropylene aluminum-coated film described in this invention. Detailed Implementation

[0025] The present invention will be further explained below with reference to the embodiments.

[0026] Example 1

[0027] A pearlescent polypropylene aluminum-coated film

[0028] It includes aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E;

[0029] The mass ratio of aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E is 0.1:15.9:32:32:20.

[0030] The raw materials for preparing the aluminum plating layer A include metallic aluminum; the thickness of the aluminum plating layer A is 40nm to 50nm; the raw materials for preparing the corona layer B include ternary copolymer polypropylene FL7540L and open-cell masterbatch AB6089; the mass ratio of the ternary copolymer polypropylene to the open-cell masterbatch is 100:2; the raw materials for preparing the support layer C include homopolymer polypropylene HP510M; the raw materials for preparing the support layer D include homopolymer polypropylene HD601CF; the raw materials for preparing the pearlescent layer E include ternary copolymer polypropylene FL7642 and pearlescent masterbatch PBR-1933; the mass ratio of the ternary copolymer polypropylene to the pearlescent masterbatch is 100:20.

[0031] The preparation steps are as follows:

[0032] Step 1: Material preparation: Prepare the raw materials for the aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E according to the mass ratio, and set them aside.

[0033] Step 2, Loading: Load the corona layer B, support layer C, support layer D and pearlescent layer E raw materials prepared in Step 1 into the hoppers of extruder I, extruder II, extruder III and extruder IV respectively.

[0034] Step 3: Preparation of pearlescent polypropylene film: The extruders are set to temperatures in a gradient of 190℃, 200℃, 200℃, 200℃, 210℃, 210℃, 210℃, 220℃, 220℃, 230℃, 230℃, 230℃, 235℃, 235℃, and 235℃. Under a pressure of 10MPa to 15MPa, the raw materials in the hoppers of extruders I, II, III, and IV are extruded through a T-die. The resulting material is then traction, cooled, corona-treated, and wound to obtain a pearlescent polypropylene film.

[0035] Step 4: Preparation of pearlescent polypropylene aluminum-coated film: The raw material for preparing pearlescent layer A is deposited on the inner side of the pearlescent polypropylene film by vacuum evaporation process to obtain the pearlescent polypropylene aluminum-coated film with a thickness of 20μm to 80μm, and the thickness of the aluminum-coated layer A is 50nm to 60nm.

[0036] Example 2

[0037] A pearlescent polypropylene aluminum-coated film

[0038] It includes aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E;

[0039] The mass ratio of aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E is 0.2:15.8:31:31:22.

[0040] The raw materials for preparing the aluminum-plated layer A include metallic aluminum; the thickness of the aluminum-plated layer A is 40nm to 50nm; the raw materials for preparing the corona layer B include ternary copolymer polypropylene RD265CF and open-cell masterbatch AB6089; the mass ratio of the ternary copolymer polypropylene to the open-cell masterbatch is 100:2.5; the raw materials for preparing the support layer C include homopolymer polypropylene HD601CF; the raw materials for preparing the support layer D include homopolymer polypropylene HD601CF; the raw materials for preparing the pearlescent layer E include ternary copolymer polypropylene SFC-750M and pearlescent masterbatch PBR-1933; the mass ratio of the ternary copolymer polypropylene to the pearlescent masterbatch is 100:25.

[0041] The preparation steps are as follows:

[0042] Step 1: Material preparation: Prepare the raw materials for the aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E according to the mass ratio, and set them aside.

[0043] Step 2, Loading: Load the corona layer B, support layer C, support layer D and pearlescent layer E raw materials prepared in Step 1 into the hoppers of extruder I, extruder II, extruder III and extruder IV respectively.

[0044] Step 3: Preparation of pearlescent polypropylene film: The extruders are set to temperatures in a gradient of 190℃, 200℃, 200℃, 200℃, 210℃, 210℃, 210℃, 220℃, 220℃, 230℃, 230℃, 230℃, 235℃, 235℃, and 235℃. Under a pressure of 10MPa to 15MPa, the raw materials in the hoppers of extruders I, II, III, and IV are extruded through a T-die. The resulting material is then traction, cooled, corona-treated, and wound to obtain a pearlescent polypropylene film.

[0045] Step 4: Preparation of pearlescent polypropylene aluminum-coated film: The raw material for preparing pearlescent layer A is deposited on the inner side of the pearlescent polypropylene film by vacuum aluminum deposition process to obtain the pearlescent polypropylene aluminum-coated film with a thickness of 20μm to 80μm, and the thickness of the aluminum layer A is 40nm to 60nm.

[0046] Example 3

[0047] A pearlescent polypropylene aluminum-coated film

[0048] It includes aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E;

[0049] The mass ratio of aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E is 0.25:15.75:31:31:22.

[0050] The raw materials for preparing the aluminized layer A include metallic aluminum; the thickness of the aluminized layer A is 40nm to 50nm; the raw materials for preparing the corona layer B include ternary copolymer polypropylene (RD265CF:FL7540L = 1:1) and open-cell masterbatch AB6089; the mass ratio of the ternary copolymer polypropylene to the open-cell masterbatch is (50+50):2.5; the raw materials for preparing the support layer C include homopolymer polypropylene HD601CF; the raw materials for preparing the support layer D include homopolymer polypropylene HD601CF; the raw materials for preparing the pearlescent layer E include ternary copolymer polypropylene (SFC-750M:FL7642 = 1:1) and pearlescent masterbatch PBR-1933; the mass ratio of the ternary copolymer polypropylene to the pearlescent masterbatch is (50+50):25.

[0051] The preparation steps are as follows:

[0052] Step 1: Material preparation: Prepare the raw materials for the aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E according to the mass ratio, and set them aside.

[0053] Step 2, Loading: Load the corona layer B, support layer C, support layer D and pearlescent layer E raw materials prepared in Step 1 into the hoppers of extruder I, extruder II, extruder III and extruder IV respectively.

[0054] Step 3: Preparation of pearlescent polypropylene film: The extruders are set to temperatures in a gradient of 190℃, 200℃, 200℃, 200℃, 210℃, 210℃, 210℃, 220℃, 220℃, 230℃, 230℃, 230℃, 235℃, 235℃, and 235℃. Under a pressure of 10MPa to 15MPa, the raw materials in the hoppers of extruders I, II, III, and IV are extruded through a T-die. The resulting material is then traction, cooled, corona-treated, and wound to obtain a pearlescent polypropylene film.

[0055] Step 4: Preparation of pearlescent polypropylene aluminum-coated film: The raw material for preparing pearlescent layer A is deposited on the inner side of the pearlescent polypropylene film by vacuum aluminum deposition process to obtain the pearlescent polypropylene aluminum-coated film with a thickness of 20μm to 80μm, and the thickness of the aluminum layer A is 40nm to 60nm.

[0056] Example 4

[0057] A pearlescent polypropylene aluminum-coated film

[0058] It includes aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E;

[0059] The mass ratio of aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E is 0.25:15.75:31:31:22.

[0060] The raw materials for preparing the aluminum-plated layer A include metallic aluminum; the thickness of the aluminum-plated layer A is 40nm to 50nm; the raw materials for preparing the corona layer B include ternary copolymer polypropylene (RD265CF:FL7540L = 1:1) and open-cell masterbatch AB602LT; the mass ratio of the ternary copolymer polypropylene to the open-cell masterbatch is (50+50):2.5; the raw materials for preparing the support layer C include homopolymer polypropylene HD601CF; the raw materials for preparing the support layer D include homopolymer polypropylene HD601CF; the raw materials for preparing the pearlescent layer E include ternary copolymer polypropylene (SFC-750M:FL7642 = 1:1) and pearlescent masterbatch PBR-1933; the mass ratio of the ternary copolymer polypropylene to the pearlescent masterbatch is (50+50):30.

[0061] The preparation steps are as follows:

[0062] Step 1: Material preparation: Prepare the raw materials for the aluminum plating layer A, corona layer B, support layer C, support layer D, and pearlescent layer E according to the mass ratio, and set them aside.

[0063] Step 2, Loading: Load the corona layer B, support layer C, support layer D and pearlescent layer E raw materials prepared in Step 1 into the hoppers of extruder I, extruder II, extruder III and extruder IV respectively.

[0064] Step 3: Preparation of pearlescent polypropylene film: The extruders are set to temperatures in a gradient of 190℃, 200℃, 200℃, 200℃, 210℃, 210℃, 210℃, 220℃, 220℃, 230℃, 230℃, 230℃, 235℃, 235℃, and 235℃. Under a pressure of 10MPa to 15MPa, the raw materials in the hoppers of extruders I, II, III, and IV are extruded through a T-die. The resulting material is then traction, cooled, corona-treated, and wound to obtain a pearlescent polypropylene film.

[0065] Step 4: Preparation of pearlescent polypropylene aluminum-coated film: The raw material for preparing pearlescent layer A is deposited on the inner side of the pearlescent polypropylene film by vacuum aluminum deposition process to obtain the pearlescent polypropylene aluminum-coated film with a thickness of 20μm to 80μm, and the thickness of the aluminum layer A is 60nm to 80nm.

[0066] The pearlescent polypropylene aluminized film prepared by this invention upgrades the traditional four-layer structure to a five-layer structure, achieving a unique composite appearance of pearlescent and aluminized coating (the traditional pearlescent aluminized film structure is as follows: BOPP / pearlescent ink / VMCPP, that is, a layer of pearlescent ink is printed on BOPP and then a layer of aluminized VMCPP film is laminated with adhesive); this pearlescent polypropylene aluminized film can be directly applied as a single layer, saving downstream color printing companies the process of printing pearlescent ink, simplifying the process and saving costs; at the same time, it completely solves the problem of solvent residue in the printing process, making it more environmentally friendly.

[0067] The pearlescent polypropylene aluminized film prepared by this invention has a simple preparation method, abundant and inexpensive raw material sources, and low production costs, making it suitable for large-scale industrial production.

[0068] The pearlescent polypropylene aluminized film prepared by this invention achieves the same pearlescent effect as pearlescent ink in terms of sensory appearance; at the same time, its physical and mechanical properties also meet the national standard requirements. For example, the tensile strength of the pearlescent polypropylene aluminized film prepared in Example 1 of this invention was measured according to the industry standard BB / T 0030-2019 for aluminized films for packaging, as shown in Table 1.

[0069] Table 1

[0070] industry standards Measured data from Example 1 Longitudinal ≥35 51.3MPa Horizontal ≥25 31.2MPa

[0071] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the description of the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pearlescent polypropylene aluminum-coated film, characterized in that, The pearlescent polypropylene aluminized film comprises, from the inside out, an aluminized layer A, a corona layer B, a support layer C, a support layer D, and a pearlescent layer E; the mass ratio of the aluminized layer A, corona layer B, support layer C, support layer D, and pearlescent layer E is (0.1-0.25):(15.75-15.9):(31-32):(31-31):(20-22).

2. The pearlescent polypropylene aluminized film according to claim 1, characterized in that, The raw material for preparing the aluminum plating layer A includes metallic aluminum; the thickness of the aluminum plating layer A is 50nm to 60nm.

3. The pearlescent polypropylene aluminized film according to claim 1, characterized in that, The raw materials for preparing the corona layer B include ternary copolymer polypropylene and open-face masterbatch; the ternary copolymer polypropylene is selected from FL7540L and / or RD265CF; the open-face masterbatch is selected from AB6089 and / or AB602LT; the mass ratio of the ternary copolymer polypropylene to the open-face masterbatch is 100:(2-2.5).

4. The pearlescent polypropylene aluminized film according to claim 1, characterized in that, The raw materials for preparing the support layer C include homopolymer polypropylene HP510M and / or homopolymer polypropylene HD601CF.

5. The pearlescent polypropylene aluminized film according to claim 1, characterized in that, The raw material for preparing the support layer D includes homopolymer polypropylene HD601CF.

6. The pearlescent polypropylene aluminized film according to claim 1, characterized in that, The raw materials for preparing the pearlescent layer E include ternary copolymer polypropylene and pearlescent masterbatch; the ternary copolymer polypropylene is selected from FL7642 and / or SFC-750M; the pearlescent masterbatch is selected from PBR-1933; the mass ratio of the ternary copolymer polypropylene to the pearlescent masterbatch is 100:(20-30).

7. The pearlescent polypropylene aluminized film according to claim 1, characterized in that, The thickness of the pearlescent polypropylene aluminum-coated film is 20μm to 80μm.

8. A method for preparing a pearlescent polypropylene aluminized film according to any one of claims 1-7, characterized in that, The preparation method includes: extruding the raw materials for preparing corona layer B, support layer C, support layer D, and pearlescent layer E to obtain a pearlescent polypropylene film, and then vacuum evaporating the raw materials for preparing aluminum layer A.

9. The preparation method according to claim 8, characterized in that, The extrusion temperature is 190℃~235℃; and / or the extrusion pressure is 10MPa~15MPa.

Images