High-haze matte film and production method thereof

Abstract

The invention belongs to the technical field of matte films, and provides a high-haze matte film and a production method thereof. The high-haze matte film comprises a base film layer and a fog film layer, the weight ratio of the base film layer to the fog film layer is (0.2-0.7): (2.5-5), and the base film layer and the fog film layer are prepared through a co-extrusion process; the fog film layer comprises the following components in parts by weight: 30-60 parts of polyethylene, 10-30 parts of modified silicon dioxide, 10-30 parts of activated aluminum oxide, 5-10 parts of matting powder, 5-15 parts of a melt index regulator, 1-5 parts of an auxiliary agent and 0.5-2 parts of low-hydrogen silicone oil, wherein the density value of the polyethylene is 1.02-1.58 g / cm < 2 >. Compared with the prior art, the matt film contains the matting powder component and also contains the melt index regulator component, so that the technical effect of improving haze can be achieved by adjusting the molecular structure of polyethylene and increasing scattering of light in a polyethylene material, and the obtained matt film has the characteristic of high haze; the matte film has extremely high diffuse reflection performance and excellent shielding effect, and the matte effect is relatively good; and the appearance quality is better.

Description

Technical Field

[0001] The invention belongs to the technical field of matte films, and in particular relates to a high-fog matte film and a production method thereof. Background Art

[0002] Matt release film is also called Matt Membrane, PET matt film, TPX matt separation film, fluoroplastic separation film, fluoroelastomer release film; PET matt film is based on the original PET transparent film, with appropriate adjustment of the raw material formula and the addition of silicon dioxide. The release film has no stickiness or slight stickiness when in contact with specific materials under limited conditions; TPX matt release film is mainly used for FPC flexible circuit boards, die-cutting industry, food packaging, and automotive thermal insulation.

[0003] In the relevant prior art, for example, an invention patent authorized by China discloses a packaging matte film and its preparation process, with the publication number CN102700204B. The specific disclosed technical solution is "the packaging matte film includes a PET base layer, a release layer, a matte frosted glossy film layer, an electroplated aluminum layer, and a process for manufacturing the packaging matte film of the present invention". The aforementioned packaging matte film is formed by pressing a matte-frosted glossy film layer on a glossy film layer by pressing a nickel matte plate. The matte plate layer is embossed for matte effect, and the matte effect is uniform and realistic, avoiding the problems of uneven matte degree that occur in the matte film of the prior art. However, the haze of the packaging matte film obtained by the solution disclosed in the patent is still relatively low, which will lead to poor diffuse reflection performance and weak shielding ability. Summary of the invention

[0004] In view of the above problems existing in the prior art, an object of the present invention is to provide a high-haze matte film and a production method thereof, so as to solve at least one technical problem raised by the background technology.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A high-fog matte film, comprising a base film layer and a fog film layer, wherein the weight ratio of the base film layer to the fog film layer is 0.2-0.7:2.5-5, and the base film layer and the fog film layer are prepared by a co-extrusion process;

[0007] The mist film layer is calculated in the following parts by weight: 30-60 parts of polyethylene, 10-30 parts of modified silicon dioxide, 10-30 parts of activated alumina, 5-10 parts of matting powder, 5-15 parts of melt index regulator, 1-5 parts of auxiliary agent, and 0.5-2 parts of low hydrogen silicone oil, wherein the density of the polyethylene is 1.02-1.58 g / cm2.

[0008] As a preferred technical solution of the present invention, the mist film layer is calculated in the following parts by weight: 48 parts of polyethylene, 20 parts of modified silica, 20 parts of activated alumina, 5 parts of matting powder, 5 parts of melt index regulator, 1 part of additive, and 1 part of low-hydrogen silicone oil.

[0009] As a preferred technical solution of the present invention, the mist film layer is calculated in the following parts by weight: 50 parts of polyethylene, 20 parts of modified silica, 15 parts of activated alumina, 6 parts of matting powder, 7 parts of melt index regulator, 1 part of auxiliary agent, and 1 part of low-hydrogen silicone oil.

[0010] As a preferred technical solution of the present invention, the matting powder includes at least one of graphite powder, powdered calcium carbonate or mica.

[0011] As a preferred technical solution of the present invention, the melt index regulator is a melt index regulator specifically for PE.

[0012] As a preferred technical solution of the present invention, the auxiliary agent includes at least one of synthetic PE wax or cracked PE wax.

[0013] As a preferred technical solution of the present invention, the density of the polyethylene is 1.45 g / cm2.

[0014] The present invention also provides a method for producing a high haze matte film as described above, the method comprising the following steps:

[0015] S1. After weighing the raw materials of the base film and the raw materials of the mist film layer, the base film raw materials are fed into a main twin-screw extruder, and the mist film layer is fed into a secondary twin-screw extruder, and a double-layer matte film extrusion sheet is obtained by co-extrusion, wherein the processing temperature of the twin-screw extruder is 300-365° C. and is evenly divided into 3-5 zones;

[0016] S2. Preheat the matte film extrusion obtained in step S1 with a heater, the preheating temperature range is 50-85°C, and the preheating time T1 is 0.3-1h; then the preheated matte film extrusion is longitudinally stretched and transversely stretched respectively, wherein the longitudinal stretching temperature of the matte film extrusion is 115-125°C, the stretching ratio is 2.5-3 times, and the stretching rate is 70-105m / min; the transverse stretching temperature is 105-125°C, the stretching ratio is 2-2.8 times, and the stretching rate is 60-75m / min; and then the high haze matte film is obtained after heat setting, cooling, pulling, corona treatment, and winding; wherein the heat setting temperature range is 225-260°C, and the heat setting time T2 is 2-3.5h.

[0017] As a preferred technical solution of the present invention, the preheating temperature is 75°C and the preheating time T1 is 0.8h.

[0018] As a preferred technical solution of the present invention, the heat setting temperature range is 250°C, and the heat setting time T2 is 3.2h

[0019] The invention relates to a high-haze matt film and a production method thereof, which has the following beneficial effects: the high-haze matt film of the invention is made of a high-density polyethylene material with a density value of 1.02-1.58 g / cm2, and contains a matting powder component and a melt index regulator component, which can adjust the molecular structure of polyethylene and increase the scattering of light inside the polyethylene material to achieve the technical effect of improving the haze, so that the matt film has the characteristics of high haze, extremely high diffuse reflection performance and excellent shielding effect, and a better matt effect; at the same time, the addition of the melt index regulator can improve the transparency and glossiness of the material, so that the product has a better appearance quality.

[0020] The present invention will be further described below in conjunction with specific implementation modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the actual product picture of the high haze matte film applied for by the present invention;

[0022] Figure 2 This is a diagram of the addition amount and melt index effect of the melt index regulator in the high haze matte film applied for the present invention. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0025] Example 1

[0026] Preparation of raw materials

[0027] The present invention provides a high haze matte film, please refer to Figure 1 and Figure 2 As shown, it includes a base film layer and a mist film layer, the weight ratio of the base film layer and the mist film layer is 0.5:2.5, and the base film layer and the mist film layer are prepared by a co-extrusion process;

[0028] The mist film layer is calculated in the following parts by weight: 30 parts of polyethylene, 25 parts of modified silicon dioxide, 25 parts of activated alumina, 8 parts of matting powder, 8 parts of melt index regulator, 3 parts of additives, and 1 part of low-hydrogen silicone oil, wherein the density of the polyethylene is 1.21 g / cm2.

[0029] The matting powder mentioned above includes graphite powder; the melt index regulator is a melt index regulator specifically for PE; and the auxiliary agent includes synthetic PE wax.

[0030] The present invention provides a method for producing a high-fog matte film, which comprises the following steps:

[0031] S1. After weighing the raw materials of the base film and the raw materials of the mist film layer, the base film raw materials are fed into a main twin-screw extruder, and the mist film layer is fed into a secondary twin-screw extruder, and a double-layer matte film extrusion sheet is obtained by co-extrusion, wherein the processing temperature of the twin-screw extruder is 300° C. and the twin-screw extruder is evenly divided into 3 zones;

[0032] S2. Preheat the matte film extrusion obtained in step S1 with a heater, the preheating temperature range is 50°C, and the preheating time T1 is 0.3h; then the preheated matte film extrusion is longitudinally stretched and transversely stretched respectively, wherein the longitudinal stretching temperature of the matte film extrusion is 115°C, the stretching ratio is 2.5 times, and the stretching rate is 70m / min; the transverse stretching temperature is 105°C, the stretching ratio is 2 times, and the stretching rate is 60m / min; and then after heat setting, cooling, pulling, corona treatment, and winding, a high haze matte film is obtained; wherein the heat setting temperature range is 225°C, and the heat setting time T2 is 2h.

[0033] Example 2

[0034] Preparation of raw materials

[0035] The present invention provides a high haze matte film, please refer to Figure 1 and Figure 2 As shown, it includes a base film layer and a mist film layer, the weight ratio of the base film layer to the mist film layer is 0.2:2.0, and the base film layer and the mist film layer are prepared by a co-extrusion process;

[0036] The mist film layer is calculated in the following parts by weight: 48 parts of polyethylene, 20 parts of modified silicon dioxide, 20 parts of activated alumina, 5 parts of matting powder, 5 parts of melt index regulator, 1 part of auxiliary agent, and 1 part of low-hydrogen silicone oil, wherein the density of the polyethylene is 1.25 g / cm2.

[0037] The matting powder comprises powdered calcium carbonate; the melt index regulator is a melt index regulator specifically for PE; and the auxiliary agent comprises synthetic PE wax.

[0038] The present invention provides a method for producing a high-fog matte film, which comprises the following steps:

[0039] S1. After weighing the raw materials of the base film and the raw materials of the mist film layer, the base film raw materials are fed into a main twin-screw extruder, and the mist film layer is fed into a secondary twin-screw extruder, and a double-layer matte film extrusion sheet is obtained by co-extrusion, wherein the processing temperature of the twin-screw extruder is 350° C. and the extruder is evenly divided into 4 zones;

[0040] S2. Preheat the matte film extrusion obtained in step S1 with a heater, the preheating temperature range is 75°C, and the preheating time T1 is 0.8h; then the preheated matte film extrusion is longitudinally stretched and transversely stretched respectively, wherein the longitudinal stretching temperature of the matte film extrusion is 120°C, the stretching ratio is 2.6 times, and the stretching rate is 100m / min; the transverse stretching temperature is 110°C, the stretching ratio is 2.5 times, and the stretching rate is 70m / min; and then after heat setting, cooling, pulling, corona treatment, and winding, a high haze matte film is obtained; wherein the heat setting temperature range is 250°C, and the heat setting time T2 is 3.2h.

[0041] Example 3

[0042] Preparation of raw materials

[0043] The present invention provides a high haze matte film, please refer to Figure 1 and Figure 2 As shown, it includes a base film layer and a mist film layer, the weight ratio of the base film layer to the mist film layer is 0.4:2.6, and the base film layer and the mist film layer are prepared by a co-extrusion process;

[0044] The mist film layer is calculated in the following parts by weight: 50 parts of polyethylene, 20 parts of modified silicon dioxide, 15 parts of activated alumina, 6 parts of matting powder, 7 parts of melt index regulator, 1 part of auxiliary agent, and 1 part of low-hydrogen silicone oil, wherein the density of the polyethylene is 1.45 g / cm2.

[0045] The matting powder includes graphite powder; the melt index regulator is a melt index regulator specifically for PE; and the auxiliary agent includes synthetic PE wax.

[0046] The present invention provides a method for producing a high-fog matte film, which comprises the following steps:

[0047] S1. After weighing the raw materials of the base film and the raw materials of the mist film layer, the base film raw materials are fed into a main twin-screw extruder, and the mist film layer is fed into a secondary twin-screw extruder, and a double-layer matte film extrusion sheet is obtained by co-extrusion, wherein the processing temperature of the twin-screw extruder is 300° C. and the twin-screw extruder is evenly divided into 4 zones;

[0048] S2. Preheat the matte film extrusion obtained in step S1 with a heater, the preheating temperature range is 75°C, and the preheating time T1 is 0.5h; then the preheated matte film extrusion is longitudinally stretched and transversely stretched respectively, wherein the longitudinal stretching temperature of the matte film extrusion is 120°C, the stretching ratio is 2.8 times, and the stretching rate is 75m / min; the transverse stretching temperature is 120°C, the stretching ratio is 2.5 times, and the stretching rate is 75m / min; and then the high haze matte film is obtained after heat setting, cooling, pulling, corona treatment, and winding; wherein the heat setting temperature range is 260°C, and the heat setting time T2 is 3h.

[0049] Example 4

[0050] Preparation of raw materials

[0051] The present invention provides a high haze matte film, please refer to Figure 1 and Figure 2 As shown, it includes a base film layer and a mist film layer, the weight ratio of the base film layer to the mist film layer is 0.5:4, and the base film layer and the mist film layer are prepared by a co-extrusion process;

[0052] The mist film layer is calculated in the following parts by weight: 51 parts of polyethylene, 11 parts of modified silicon dioxide, 14 parts of activated alumina, 8 parts of matting powder, 10.5 parts of melt index regulator, 4 parts of auxiliary agent, and 1.5 parts of low-hydrogen silicone oil, wherein the density of the polyethylene is 1.50 g / cm2.

[0053] The matting powder includes mica; the melt index regulator is a melt index regulator specifically for PE; and the auxiliary agent includes cracked PE wax.

[0054] The present invention provides a method for producing a high-fog matte film, which comprises the following steps:

[0055] S1. After weighing the raw materials of the base film and the raw materials of the mist film layer, the base film raw materials are fed into a main twin-screw extruder, and the mist film layer is fed into a secondary twin-screw extruder, and a double-layer matte film extrusion sheet is obtained by co-extrusion, wherein the processing temperature of the twin-screw extruder is 310° C. and the twin-screw extruder is evenly divided into 4 zones;

[0056] S2. Preheat the matte film extrusion obtained in step S1 with a heater, the preheating temperature range is 80°C, and the preheating time T1 is 1h; then the preheated matte film extrusion is longitudinally stretched and transversely stretched respectively, wherein the longitudinal stretching temperature of the matte film extrusion is 115°C, the stretching ratio is 2.5 times, and the stretching rate is 70m / min; the transverse stretching temperature is 110°C, the stretching ratio is 2 times, and the stretching rate is 65m / min; and then after heat setting, cooling, pulling, corona treatment, and winding, a high haze matte film is obtained; wherein the heat setting temperature range is 230°C, and the heat setting time T2 is 2.6h.

[0057] Example 5

[0058] Preparation of raw materials

[0059] The present invention provides a high haze matte film, please refer to Figure 1 and Figure 2 As shown, it includes a base film layer and a mist film layer, the weight ratio of the base film layer and the mist film layer is 0.65:4.5, and the base film layer and the mist film layer are prepared by a co-extrusion process;

[0060] The mist film layer is calculated in the following parts by weight: 45 parts of polyethylene, 15 parts of modified silicon dioxide, 15 parts of activated alumina, 9 parts of matting powder, 11 parts of melt index regulator, 3 parts of auxiliary agent, and 2 parts of low-hydrogen silicone oil, wherein the density of the polyethylene is 1.02-1.58 g / cm2.

[0061] The matting powder comprises powdered calcium carbonate; the melt index regulator is a melt index regulator specifically for PE; and the auxiliary agent comprises synthetic PE wax.

[0062] The present invention provides a method for producing a high-fog matte film, which comprises the following steps:

[0063] S1. After weighing the raw materials of the base film and the raw materials of the mist film layer, the base film raw materials are fed into a main twin-screw extruder, and the mist film layer is fed into a secondary twin-screw extruder, and a double-layer matte film extrusion sheet is obtained by co-extrusion, wherein the processing temperature of the twin-screw extruder is 320° C. and is evenly divided into 5 zones;

[0064] S2. Preheat the matte film extrusion obtained in step S1 with a heater, the preheating temperature range is 82°C, and the preheating time T1 is 0.5h; then the preheated matte film extrusion is longitudinally stretched and transversely stretched respectively, wherein the longitudinal stretching temperature of the matte film extrusion is 120°C, the stretching ratio is 3 times, and the stretching rate is 100m / min; the transverse stretching temperature is 118°C, the stretching ratio is 2.5 times, and the stretching rate is 70m / min; and then after heat setting, cooling, pulling, corona treatment, and winding, a high haze matte film is obtained; wherein the heat setting temperature range is 250°C, and the heat setting time T2 is 3h.

[0065] Example 6

[0066] Preparation of raw materials

[0067] The present invention provides a high haze matte film, please refer to Figure 1 and Figure 2 As shown, it includes a base film layer and a mist film layer, the weight ratio of the base film layer to the mist film layer is 0.7:5, and the base film layer and the mist film layer are prepared by a co-extrusion process;

[0068] The mist film layer is calculated in the following parts by weight: 33 parts of polyethylene, 25 parts of modified silicon dioxide, 25 parts of activated alumina, 5 parts of matting powder, 5 parts of melt index regulator, 5 parts of additives, and 2 parts of low-hydrogen silicone oil, wherein the density of the polyethylene is 1.58 g / cm2.

[0069] The matting powder includes mica; the melt index regulator is a melt index regulator specifically for PE; and the auxiliary agent includes synthetic PE wax.

[0070] The present invention provides a method for producing a high-fog matte film, which comprises the following steps:

[0071] S1. After weighing the raw materials of the base film and the raw materials of the mist film layer, the base film raw materials are fed into a main twin-screw extruder, and the mist film layer is fed into a secondary twin-screw extruder, and a double-layer matte film extrusion sheet is obtained by co-extrusion, wherein the processing temperature of the twin-screw extruder is 365° C. and is evenly divided into 5 zones;

[0072] S2. Preheat the matte film extrusion obtained in step S1 with a heater, the preheating temperature range is 85°C, and the preheating time T1 is 1h; then the preheated matte film extrusion is longitudinally stretched and transversely stretched respectively, wherein the longitudinal stretching temperature of the matte film extrusion is 125°C, the stretching ratio is 3 times, and the stretching rate is 105m / min; the transverse stretching temperature is 125°C, the stretching ratio is 2.8 times, and the stretching rate is 75m / min; and then after heat setting, cooling, pulling, corona treatment, and winding, a high haze matte film is obtained; wherein the heat setting temperature range is 260°C, and the heat setting time T2 is 3.5h.

[0073] Comparative Example 1

[0074] Other conditions and operations are the same as those in Example 1, except that no matting powder is added in step S1.

[0075] Comparative Example 2

[0076] Other conditions and operations are the same as those in Example 1, except that no melt index regulator is added in step S1.

[0077] Comparative Example 3

[0078] Other conditions and operations are the same as those in Example 1, except that no matting powder and no melt index regulator are added in step S1.

[0079] Reference example

[0080] Other conditions and operations are the same as those in Example 1, except that no polyethylene, no matting powder and no melt index regulator are added in step S1.

[0081] It should be noted that: the present invention provides a high haze matte film, the prepared high haze matte film is shown in the picture Figure 1 As shown; its preparation is provided in this application Examples 1-6, Comparative Examples 1-3 and Reference Examples, wherein the melt index regulator used in the production method is produced by Shenzhen Xinchanglong New Materials Research Institute Co., Ltd., and the product is a white powder melt index regulator R1-1, the melting point of which is 140°C. When used, it is added and mixed evenly with the raw materials, wherein the addition amount of the melt index regulator and the melt index effect are shown in Figure 2 .

[0082] The gloss (45°) is tested according to the GB / T 8807 method, the haze is tested according to the GB / T2410 method, and the tensile strength is tested according to the ASTM D-882 standard. The following performance tests are performed on the matte films obtained in the above-mentioned Examples 1-6, Comparative Examples 1-3 and Reference Examples, and the results are shown in Table 1 below.

[0083] Glossiness (45°) Haze Tensile strength(Mpa) Example 1 18.7％ 90.3％ 263 Example 2 20.3％ 95.8％ 207 Example 3 20.1％ 95.5％ 201 Example 4 19.4％ 91.3％ 246 Example 5 19.1％ 92.7％ 232 Example 6 19.7％ 93.6％ 237 Comparative Example 1 18.1％ 84.1％ 172 Comparative Example 2 17.3％ 82.8％ 163 Comparative Example 3 15.2％ 74.4％ 181 Reference example 8.2％ 60.5％ 105

[0084] It can be seen from Table 1 that compared with Comparative Examples 1-3, the haze of the matte film obtained by the present invention using high-density polyethylene material with a density of 1.02-1.58 g / cm2 is greater than 90%, and the haze of the matte film obtained by the processes of Example 2 and Example 3 is better; Figure 1 As shown, the Figure 1 This is a picture of the matte film of the present invention taken at one viewing angle, in which the dark shadow appearing in the upper left corner of the picture is caused by light blocking and has no substantial effect on its performance; in addition to the matting powder component, a melt index regulator component is also added, which can increase the scattering of light inside the polyethylene material by adjusting the molecular structure of polyethylene, thereby achieving the technical effect of improving the haze, so that the matte film has the characteristics of high haze, extremely high diffuse reflection performance and excellent shielding effect, and the matte effect is better; at the same time, the addition of the melt index regulator can improve the transparency and glossiness of the material, so that the product has better appearance quality.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0086] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements may be made without departing from the inventive concept of the present invention, which all fall within the protection scope of the present invention.

Claims

1. A high haze matte film, characterized in that: It comprises a base film layer and a mist film layer, wherein the weight ratio of the base film layer to the mist film layer is 0.2-0.7:2.5-5, and the base film layer and the mist film layer are prepared by a co-extrusion process; The mist film layer is calculated in the following parts by weight: 30-60 parts of polyethylene, 10-30 parts of modified silicon dioxide, 10-30 parts of activated alumina, 5-10 parts of matting powder, 5-15 parts of melt index regulator, 1-5 parts of auxiliary agent, and 0.5-2 parts of low hydrogen silicone oil, wherein the density of the polyethylene is 1.02-1.58 g / cm2.

2. The high haze matte film according to claim 1, characterized in that: The mist film layer is calculated in the following parts by weight: 48 parts of polyethylene, 20 parts of modified silicon dioxide, 20 parts of activated alumina, 5 parts of matting powder, 5 parts of melt index regulator, 1 part of auxiliary agent, and 1 part of low-hydrogen silicone oil.

3. The high haze matte film according to claim 1, characterized in that: The mist film layer is calculated in the following parts by weight: 50 parts of polyethylene, 20 parts of modified silicon dioxide, 15 parts of activated alumina, 6 parts of matting powder, 7 parts of melt index regulator, 1 part of auxiliary agent, and 1 part of low-hydrogen silicone oil.

4. The high haze matte film according to claim 1, characterized in that: The matting powder includes at least one of graphite powder, powdered calcium carbonate or mica.

5. A high haze matte film according to any one of claims 1 to 4, characterized in that: The melt index regulator is a special melt index regulator for PE.

6. A high haze matte film according to any one of claims 1 to 4, characterized in that: The auxiliary agent includes at least one of synthetic PE wax and cracked PE wax.

7. A high haze matte film according to any one of claims 1 to 4, characterized in that: The density value of the polyethylene is 1.45 g / cm2.

8. A method for producing a high haze matte film according to any one of claims 1 to 7, characterized in that: The production method comprises the following steps S1. After weighing the raw materials of the base film and the raw materials of the mist film layer, the base film raw materials are fed into a main twin-screw extruder, and the mist film layer is fed into a secondary twin-screw extruder, and a double-layer matte film extrusion sheet is obtained by co-extrusion, wherein the processing temperature of the twin-screw extruder is 300-365° C. and is evenly divided into 3-5 zones; S2. Preheat the matte film extrusion obtained in step S1 with a heater, the preheating temperature range is 50-85°C, and the preheating time T1 is 0.3-1h; then the preheated matte film extrusion is longitudinally stretched and transversely stretched respectively, wherein the longitudinal stretching temperature of the matte film extrusion is 115-125°C, the stretching ratio is 2.5-3 times, and the stretching rate is 70-105m / min; the transverse stretching temperature is 105-125°C, the stretching ratio is 2-2.8 times, and the stretching rate is 60-75m / min; and then the high haze matte film is obtained after heat setting, cooling, pulling, corona treatment, and winding; wherein the heat setting temperature range is 225-260°C, and the heat setting time T2 is 2-3.5h.

9. The production method according to claim 8, characterized in that: The preheating temperature is 75°C, and the preheating time T1 is 0.8h.

10. The production method according to claim 8, characterized in that: The heat setting temperature range is 250° C., and the heat setting time T2 is 3.2 h.

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