Preparation method of PP (polypropylene) anti-UV (ultraviolet) and water-blocking high-temperature-boiling-resistant barrier film

Abstract

The invention belongs to the field of high-barrier films, and particularly relates to a preparation method of a PP (polypropylene) anti-UV (ultraviolet) and water-blocking high-temperature-boiling-resistant barrier film, which comprises the following steps: step 1, selecting and purchasing: firstly, selecting and purchasing an extruder, drying equipment, processing raw materials and a winding device, and specifically, the raw materials comprise polyamide resin, bonding resin, polypropylene resin and ethylene-vinyl alcohol copolymer; according to the invention, the polyamide resin, the bonding resin, the polypropylene resin and the ethylene-vinyl alcohol copolymer are arranged, the polyamide resin is PA6 resin, the used polyamide resin is a mixture of polypropylene resin and propenyl modified adhesive resin, the polypropylene resin used in the inner layer is a mixture of co-polypropylene resin and polypropylene resin elastomer, and the polypropylene resin used in the outer layer is an ethylene-vinyl alcohol copolymer. The polypropylene resin anti-UV resin and the polypropylene resin water-blocking resin are a mixture of anti-UV modified resin, water-blocking resin and PP, can keep stable in the high-temperature cooking process, and block invasion of ultraviolet rays, oxygen and water, so that the shelf life and the service life of products in the package are prolonged.

Description

Technical Field

[0001] The invention relates to the field of high barrier films, and in particular to a method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film. Background Art

[0002] High barrier film is a multi-layer film made by simultaneously extruding a material with strong gas barrier properties and a polyolefin with strong heat-sealing and moisture barrier properties. In the packaging field, EVOH is made into a composite film as an intermediate barrier layer and is used in all hard and soft packaging. In the food industry, it is used for aseptic packaging, hot cans and retort bags, and for packaging dairy products, meat, canned juice and condiments. In the non-food field, it is used for packaging solvents, chemicals, air-conditioning structural parts, gasoline barrel liners, electronic components, etc.

[0003] Existing packaging materials are prone to degradation, aging and performance degradation under the influence of environmental factors such as high-temperature cooking, ultraviolet radiation and moisture. Especially in the field of food and pharmaceutical packaging, traditional materials are difficult to simultaneously meet the requirements of high barrier, high temperature resistance, ultraviolet resistance and water barrier, resulting in shortened product shelf life and reduced quality. To this end, we provide a method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film, which solves the problem that traditional materials are difficult to simultaneously meet the requirements of high barrier, high temperature resistance, UV resistance and water barrier, resulting in shortened product shelf life and reduced quality.

[0005] To achieve the above object, the present invention provides the following technical solutions: A method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film, comprising the steps of: first, purchasing an extruder, a drying device, processing raw materials and a winding device, wherein the raw materials are specifically polyamide resin, adhesive resin, polypropylene resin and ethylene-vinyl alcohol copolymer; Step 2: Installation: Install the extruder, drying equipment and winding device in a plant with three-phase electricity; Step 3: Drying: pre-drying the polyamide resin and ethylene-vinyl alcohol copolymer; Step 4: Mixing, mixing the polypropylene resin and the elastomer mixture and then pressing; Step 5: adding raw materials, mixing the propylene-modified adhesive resin with the polypropylene resin, which can be made into an adhesive resin, and coating it on the outer layer of the polypropylene resin; Step 6: Discharging, start the extruder, and set the screw speed to 7rpm; Step 7: Fix and use the traction rope to pull the film from the cold roller position to the winding device; Step 8: Start the thickness measuring instrument to measure the thickness of the diaphragm; Step nine: Start the winding device to wind up the film.

[0006] As a preferred technical solution of the present invention, the PA resin is PA6 resin.

[0007] As a preferred technical solution of the present invention, the ethylene-vinyl alcohol copolymer is a high temperature resistant ethylene-vinyl alcohol copolymer with an ethylene content of 29%.

[0008] As a preferred technical solution of the present invention, the PP anti-UV resin and PP water-blocking resin used are a mixture of anti-UV modified resin, water-blocking resin and PP.

[0009] As a preferred technical solution of the present invention, the thickness of each layer accounts for 9%, 5%, 16%, 5%, 9%, 4%, 9%, 5%, 24% and 14% respectively.

[0010] As a preferred technical solution of the present invention, the temperature of the polypropylene resin and the easy-release resin needs to be controlled at 180-230°C.

[0011] As a preferred technical solution of the present invention, the temperature of the adhesive resin needs to be controlled at 200-220°C.

[0012] As a preferred technical solution of the present invention, the temperature of the ethylene-vinyl alcohol copolymer needs to be controlled at 180-220°C.

[0013] As a preferred technical solution of the present invention, the temperature of the polyamide resin needs to be controlled at 220-260°C.

[0014] As a preferred technical solution of the present invention, the temperature of the cold roller is 30° C., the fixed edge voltage is 15 KV, and the air knife pressure is 5 bar.

[0015] Compared with the prior art, the present invention provides a method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film, which has the following beneficial effects: The present invention is provided with a polyamide resin, an adhesive resin, a polypropylene resin and an ethylene-vinyl alcohol copolymer, and the polyamide resin is a PA6 resin, the polyamide resin used is a mixture of a polypropylene resin and a propylene-modified adhesive resin, the polypropylene resin used in the inner layer is a mixture of a copolymerized polypropylene resin and a polypropylene resin elastomer, the ethylene-vinyl alcohol copolymer used is a high-temperature resistant ethylene-vinyl alcohol copolymer with an ethylene content of 29%, the polypropylene resin anti-UV resin and the polypropylene resin water-blocking resin used are a mixture of an anti-UV modified resin, a water-blocking resin and PP, and the thickness of each layer accounts for 9%, 5%, 16%, 5%, 9%, 4%, 9%, 5%, 24% and 14% respectively. The present invention can remain stable during high-temperature cooking and block the invasion of ultraviolet rays, oxygen and moisture, thereby extending the shelf life and service life of the product in the package. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram selected in the present invention; Figure 2 Schematic diagram of the preparation in the present invention. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example See also Figure 1-2 In this embodiment: a method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film comprises the step 1: purchasing, firstly purchasing an extruder, a drying device, processing raw materials and a winding device, the raw materials specifically being polyamide resin, adhesive resin, polypropylene resin and ethylene-vinyl alcohol copolymer; Step 2: Installation: Install the extruder, drying equipment and winding device in a plant with three-phase electricity; Step 3: Drying: pre-drying the polyamide resin and ethylene-vinyl alcohol copolymer; Step 4: Mixing, mixing the polypropylene resin and the elastomer mixture and then pressing; Step 5: adding raw materials, mixing the propylene-modified adhesive resin with the polypropylene resin, which can be made into an adhesive resin, and coating it on the outer layer of the polypropylene resin; Step 6: Discharging, start the extruder, and set the screw speed to 7rpm; Step 7: Fix and use the traction rope to pull the film from the cold roller position to the winding device; Step 8: Start the thickness measuring instrument to measure the thickness of the diaphragm; Step nine: Start the winding device to wind up the film.

[0019] In this embodiment, the PA resin is PA6 resin, which can improve the quality.

[0020] In this embodiment, the ethylene-vinyl alcohol copolymer is a high-temperature resistant ethylene-vinyl alcohol copolymer with an ethylene content of 29%, which can increase the service life of the ethylene-vinyl alcohol copolymer.

[0021] In this embodiment, the PP anti-UV resin and PP water-blocking resin used are a mixture of anti-UV modified resin, water-blocking resin and PP, which can increase the effect of the barrier film.

[0022] In this embodiment, the thickness of each layer is 9%, 5%, 16%, 5%, 9%, 4%, 9%, 5%, 24% and 14% respectively, which can maximize the waterproof effect.

[0023] In this embodiment, the temperature of the polypropylene resin and the easy-release resin needs to be controlled at 180-230° C., which can enhance the heat resistance of the barrier film.

[0024] In this embodiment, the temperature of the adhesive resin needs to be controlled at 200-220° C., which can enhance the heat resistance and UV resistance of the barrier film.

[0025] In this embodiment, the temperature of the ethylene-vinyl alcohol copolymer needs to be controlled at 180-220° C. Using the ethylene-vinyl alcohol copolymer at 180-220° C. can improve its corrosion resistance.

[0026] In this embodiment, the temperature of the polyamide resin needs to be controlled at 220-260° C., which can improve the heat resistance of the polyamide resin.

[0027] In this embodiment, the temperature of the cold roller is 30° C., the fixed edge voltage is 15 KV, and the air knife pressure is 5 bar, which can protect the diaphragm.

[0028] The working principle and use process of the present invention are as follows: first, an extruder, a winding device, a drying equipment and raw materials are selected and purchased, and the equipment is installed in a factory. The drying equipment is used to dry the ethylene-vinyl alcohol copolymer and the polyamide resin, and the adhesive resin is mixed with the elastomer mixture. Subsequently, the ethylene-vinyl alcohol copolymer is mixed with the propylene-modified adhesive resin, and is coated on the outer layer of the elastomer mixture. Subsequently, it is pressed out by an extruder and wound up by a winding device. The above is the entire use process of the new type of the present invention.

[0029] In the description of the present invention, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprising a reference structure" do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. It should be noted that, in this article, relational terms such as "first", "second", etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film, characterized in that: The method comprises the steps of: first, purchasing an extruder, a drying device, processing raw materials and a winding device, wherein the raw materials are specifically polyamide resin, adhesive resin, polypropylene resin and ethylene-vinyl alcohol copolymer; Step 2: Installation: Install the extruder, drying equipment and winding device in a plant with three-phase electricity; Step 3: Drying: pre-drying the polyamide resin and ethylene-vinyl alcohol copolymer; Step 4: Mixing, mixing the polypropylene resin and the elastomer mixture and then pressing; Step 5: adding raw materials, mixing the propylene-modified adhesive resin with the polypropylene resin, which can be made into an adhesive resin, and coating it on the outer layer of the polypropylene resin; Step 6: Discharging, start the extruder, and set the screw speed to 7rpm; Step 7: Fix and use the traction rope to pull the film from the cold roller position to the winding device; Step 8: Start the thickness measuring instrument to measure the thickness of the diaphragm; Step nine: Start the winding device to wind up the film.

2. The method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film according to claim 1, characterized in that: The PA resin is PA6 resin.

3. The method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film according to claim 1, characterized in that: The ethylene-vinyl alcohol copolymer is a high temperature resistant ethylene-vinyl alcohol copolymer with an ethylene content of 29%.

4. The method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film according to claim 1, characterized in that: The PP anti-UV resin and PP water-blocking resin used are a mixture of anti-UV modified resin, water-blocking resin and PP.

5. The method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film according to claim 1, characterized in that: The thickness of each layer accounts for 9%, 5%, 16%, 5%, 9%, 4%, 9%, 5%, 24% and 14% respectively.

6. The method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film according to claim 1, characterized in that: The temperature of the polypropylene resin and the easy-release resin needs to be controlled at 180-230°C.

7. The method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film according to claim 1, characterized in that: The temperature of the adhesive resin needs to be controlled at 200-220°C.

8. The method for planting melon and fruit agricultural and sideline products according to claim 1, characterized in that: The temperature of the ethylene-vinyl alcohol copolymer needs to be controlled at 180-220°C.

9. The method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film according to claim 1, characterized in that: The temperature of the polyamide resin needs to be controlled at 220-260°C.

10. The method for preparing a PP UV-resistant and water-resistant high-temperature cooking barrier film according to claim 1, characterized in that: The temperature of the cold roller is 30° C., the fixed edge voltage is 15 KV, and the air knife pressure is 5 bar.

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