Manufacturing process of a press working protective film

Abstract

The application discloses a manufacturing process of a stamping processing protective film, which comprises the following steps: step one, stirring and mixing zinc oxide, polysebacic acid-decanediol diol and dicyclohexyl carbodiimide at 50-60 DEG C to obtain material A; step two, putting 100 parts of low-density polyethylene with a melt index of 0.5-5 g / 10 min, metallocene linear low-density polyethylene with a melt index of 1.8-2 g / 10 min, oleic acid amide, zinc stearate, stearate and an antioxidant into a mixer, uniformly mixing and then extruding and granulating in a double-screw extruder to obtain material B; step three, putting material A, material B and terpolymer polypropylene into a banbury mixer, discharging after banburying for 10-30 min to obtain a master batch; and step four, blow molding the master batch to obtain a polyethylene base material layer. The protective film improves the elongation at break of the film and also improves the puncture resistance of the protective film.

Description

Technical Field

[0001] This invention relates to the field of protective films, and more particularly to a manufacturing process for a stamped protective film. Background Technology

[0002] Polyethylene film is characterized by its softness, good toughness, high elongation, ease of bending and processing, and good adhesion, giving it a significant market share in protective films. Currently, metal stamping is a widely used and mature process in the automotive, home appliance, and other manufacturing industries. During metal sheet stamping, the high tensile forces, friction, and localized high temperatures in the processing environment can cause scratches, wrinkles, and even cracks on the surface of the stamped products, and also reduce the lifespan of the molds. Therefore, protective films must be applied to metal stamping parts during the stamping process. Summary of the Invention

[0003] The purpose of this invention is to provide a manufacturing process for a stamping protective film. The protective film obtained by this manufacturing process has improved elongation at break, making it less prone to breakage during stamping, and also improves the puncture resistance of the protective film, with a puncture force exceeding 18N, thereby expanding its application prospects.

[0004] To achieve the above objectives, the protective film technology solution adopted in this invention is: a manufacturing process for a stamped protective film, wherein the protective film comprises a polyethylene substrate layer and an adhesive layer coated on one surface of the polyethylene substrate layer, a release material layer is bonded to the surface of the adhesive layer opposite to the polyethylene substrate layer, and the protective film is obtained by blow molding of masterbatch from the polyethylene substrate layer, comprising the following steps: Step 1: Mix 0.2 parts zinc oxide, 2 parts polydecanoic acid-decanediol diol, and 2.2 parts dicyclohexylcarbodiimide at 50℃~60℃ to obtain material A; Step 2: Add 100 parts of low-density polyethylene with a melt index of 0.5~5g / 10min, 12 parts of metallocene linear low-density polyethylene with a melt index of 1.8~2g / 10min, 0.6 parts of oleamide, 0.6 parts of zinc stearate, 0.4 parts of zinc stearate, and 0.6 parts of antioxidant into a mixer, mix evenly, and then extrude and granulate using a twin-screw extruder to obtain material B; Step 3: Add material A, material B and 10 parts of ternary copolymer polypropylene into a mixer, mix for 10-30 minutes and then discharge to obtain the masterbatch; Step 4: Blow-molde the masterbatch to obtain a polyethylene substrate layer; Step 5: Apply an adhesive layer to one surface of the polyethylene substrate layer; Step 6: A release material layer is attached to the surface of the adhesive layer that is opposite to the polyethylene substrate layer.

[0005] The following is a further improvement to the above technical solution: 1. In the above scheme, the ternary copolymer polypropylene is an ethylene-propylene-1-butene ternary copolymer.

[0006] 2. In the above scheme, the mixing time in step three is 15 minutes.

[0007] 3. In the above scheme, the antioxidant is at least one of antioxidant 1010, antioxidant 168, and antioxidant 616.

[0008] 4. In the above scheme, step two involves mixing at room temperature.

[0009] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The present invention discloses a manufacturing process for a stamping protective film. The protective film's polyethylene substrate layer is based on low-density polyethylene with a melt flow index of 0.5~5 g / 10 min, metallocene linear low-density polyethylene with a melt flow index of 1.8~2 g / 10 min, and ternary copolymer polypropylene. Further addition of polysaccharide-decanediol diol and dicyclohexylcarbodiimide improves the film's elongation at break, making it less prone to breakage during stamping and also enhancing its puncture resistance, achieving a puncture force of 18 N, thus expanding its application prospects. Detailed Implementation

[0010] The present invention will be further described below with reference to embodiments: Example: A manufacturing process for a stamping protective film, wherein the protective film includes a polyethylene substrate layer and an adhesive layer coated on one surface of the polyethylene substrate layer, and a release material layer is attached to the surface of the adhesive layer opposite to the polyethylene substrate layer. The polyethylene substrate layer is obtained by blow molding a masterbatch to form a protective film, and the masterbatch is composed of the following components in parts by weight: The following steps are included: 100 parts of low-density polyethylene with a melt index of 0.5~5 g / 10min, 12 parts of metallocene linear low-density polyethylene with a melt index of 1.8~2 g / 10min, 10 parts of ternary copolymer polypropylene, 0.6 parts of oleamide, 0.4 parts of zinc stearate, 0.2 parts of zinc oxide, 0.6 parts of zinc stearate, 2 parts of polydecanoic acid-decanediol diol, 2.2 parts of dicyclohexylcarbodiimide, and 0.6 parts of antioxidant; Step 1: Mix 0.2 parts zinc oxide, 2 parts polydecanoic acid-decanediol diol, and 2.2 parts dicyclohexylcarbodiimide at 50℃~60℃ to obtain material A; Step 2: Add 100 parts of low-density polyethylene with a melt index of 0.5~5g / 10min, 12 parts of metallocene linear low-density polyethylene with a melt index of 1.8~2g / 10min, 0.6 parts of oleamide, 0.6 parts of zinc stearate, 0.4 parts of zinc stearate, and 0.6 parts of antioxidant into a mixer, mix evenly, and then extrude and granulate using a twin-screw extruder to obtain material B; Step 3: Add material A, material B and 10 parts of ternary copolymer polypropylene into a mixer, mix for 10-30 minutes and then discharge to obtain the masterbatch; Step 4: Blow-molde the masterbatch to obtain a polyethylene substrate layer; Step 5: Apply an adhesive layer to one surface of the polyethylene substrate layer; Step 6: A release material layer is attached to the surface of the adhesive layer that is opposite to the polyethylene substrate layer.

[0011] The antioxidant is antioxidant 1010; The aforementioned ternary copolymer polypropylene is an ethylene-propylene-1-butene ternary copolymer.

[0012] Comparative Examples 1-3: A manufacturing process for a stamped protective film, wherein the polyethylene substrate layer of the protective film is obtained by blow molding from masterbatch, and the masterbatch is composed of the following components in parts by weight, as shown in Table 1: Table 1 ; The preparation method for the comparative example follows the same steps as the preparation method for the embodiment.

[0013] The performance test data of the substrate layer in the protective films obtained by the manufacturing processes of Examples 1-3 are shown in Table 2: Table 2 .

[0014] As shown in Table 2, the substrate layer of the protective film obtained using the manufacturing process of this invention exhibits good elongation at break and puncture resistance. Comparative Example 1 shows good elongation at break but poor puncture resistance; Comparative Example 2 shows poor elongation at break and poor puncture resistance; and Comparative Example 3 shows poor elongation at break but good puncture resistance. This indicates that the substrate layer in the protective film of this invention improves the elongation at break of the film, making it less prone to breakage during stamping, while also enhancing the puncture resistance of the protective film, achieving a puncture force of 18N, thereby expanding its application prospects.

[0015] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A manufacturing process for a stamped protective film, characterized in that: The protective film includes a polyethylene substrate layer and an adhesive layer coated on one surface of the polyethylene substrate layer. A release material layer is bonded to the surface of the adhesive layer opposite to the polyethylene substrate layer. The protective film is obtained by blow molding of the polyethylene substrate layer from masterbatch, including the following steps: Step 1: Mix 0.2 parts zinc oxide, 2 parts polydecanoic acid-decanediol diol, and 2.2 parts dicyclohexylcarbodiimide at 50℃~60℃ to obtain material A; Step 2: Add 100 parts of low-density polyethylene with a melt index of 0.5~5g / 10min, 12 parts of metallocene linear low-density polyethylene with a melt index of 1.8~2g / 10min, 0.6 parts of oleamide, 0.6 parts of zinc stearate, 0.4 parts of zinc stearate, and 0.6 parts of antioxidant into a mixer, mix evenly, and then extrude and granulate using a twin-screw extruder to obtain material B; Step 3: Add material A, material B and 10 parts of ternary copolymer polypropylene into a mixer, mix for 10-30 minutes and then discharge to obtain the masterbatch; Step 4: Blow-molde the masterbatch to obtain a polyethylene substrate layer; Step 5: Apply an adhesive layer to one surface of the polyethylene substrate layer; Step 6: A release material layer is attached to the surface of the adhesive layer that is opposite to the polyethylene substrate layer.

2. The manufacturing process of the stamping protective film according to claim 1, characterized in that: The ternary copolymer polypropylene is an ethylene-propylene-1-butene ternary copolymer.

3. The manufacturing process of the stamping protective film according to claim 1, characterized in that: The mixing time for step three is 15 minutes.

4. The manufacturing process of the stamping protective film according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 1010, antioxidant 168, and antioxidant 616.

5. The manufacturing process of the stamping protective film according to claim 1, characterized in that: Step two involves mixing at room temperature.