Composition for extinction material, extinction material as well as preparation method and application of extinction material

Abstract

The invention relates to the technical field of matt films, and discloses a composition for a matt material, the matt material and a preparation method and application of the matt material, the composition contains binary co-polypropylene, high-density polyethylene, an organic matting agent, an antioxidant and an acid acceptor; based on the total weight of the binary co-polypropylene, the high-density polyethylene and the organic matting agent in the composition, the content of the binary co-polypropylene is 45-65 wt%, the content of the high-density polyethylene is 30-50 wt%, and the content of the organic matting agent is 1-14 wt%; the content of the antioxidant is 0.5-2 wt% per thousand, and the content of the acid acceptor is 0.1-0.5 wt% per thousand. The matting material provided by the invention has excellent matting performance while having good film-forming performance, and does not generate unpleasant odor.

Description

Technical Field

[0001] The present invention relates to the technical field of matting films, and specifically relates to a composition for matting materials, a matting material, a preparation method thereof, and an application thereof. Background Art

[0002] With the change of people's aesthetic concepts, the requirements for packaging products are constantly updated, presenting diverse requirements for the surface characteristics of packaging materials, so as to reflect the characteristics of packaged items from multiple aspects such as aesthetics, shelf display effects, and advertising, and have special effects that stimulate consumers' sensory vision. Matting films are new varieties of films developed to meet these requirements. A matting film is a packaging film with a surface similar to paper, having a very low gloss and a very high haze, and achieving a diffuse reflection matting effect. The reflected light on its surface is weak and soft, and the surface gloss is low, while the haze is generally above 70%. It has many advantages such as comfortable hand feeling, quiet and elegant appearance, and the ability to reproduce colors vividly during printing, and is known as a natural light gloss film.

[0003] Almost all plastic varieties can be used to produce matting films, such as polyamide (PA), polyethylene terephthalate (PET), polycarbonate (PC), polyethylene (PE), polypropylene (PP). Among them, polyolefin matting films are the main ones, and among polyolefin matting films, biaxially oriented polypropylene matting films (BOPP matting films) occupy a large share of the matting film market. Currently, the mainstream matting films on the market mainly include a matting layer, a core layer, and a surface layer. According to statistics, the melt flow index of the special material currently applied to the matting layer of matting film products is generally about 2 g / 10 min (230 °C / 2.16 kg), which has the following impacts on the existing processing technology: 1. Higher processing temperature: Since the melt index of the plastic is small, its melting temperature is relatively high. If high-frequency processing is used for heating, the processing temperature needs to be increased, which will increase the processing cost; 2. Unstable product performance: The small melt index of the plastic indicates a large molecular weight and high viscosity, which limits its plasticizing performance. Therefore, the low fluidity during the film-forming process limits the uniformity of the matting layer of the film and affects the matting performance of the film.

[0004] CN111117077A discloses a matting agent for BOPP matting film, its preparation method and a BOPP matting film, which include the following raw materials by weight percentage: 40%-60% of copolymerized polypropylene, 35%-55% of high-density polyethylene, 5%-15% of masterbatch A, and 0.5%-5% of antioxidant masterbatch; wherein masterbatch A includes a masterbatch matrix, hydrogenated petroleum resin or rosin resin, and the masterbatch matrix is polypropylene. This prior art can improve the matting uniformity and haze of the matting film to a certain extent. However, the melt mass flow rate of the matting material provided by this prior art is low, and it is easy to generate more waste during the actual production and processing process due to uneven flow dispersion. Moreover, in order to better melt and plasticize the matting material, a higher processing temperature is required, and the matting uniformity and haze of the matting film still need to be further improved.

[0005] CN103665540A discloses a matting polypropylene composite material and its preparation method. Its composition is as follows by mass fraction: 60-80% of polypropylene, 2-20% of toughening agent, 5-20% of compatibilizer, 5-25% of organic matting agent, 0.5-5% of inorganic matting agent, 0.1-2% of antioxidant, and 2-20% of inorganic filler. The composite material provided by this prior art has excellent matting performance. However, this composite material has a strong pungent smell, the working environment in the processing workshop is poor during the actual processing process, the matting products obtained still have a certain pungent smell, and it will gradually volatilize into the air during use with the change of use time and environmental temperature, endangering the health of processing personnel and consumers. Summary of the Invention

[0006] The purpose of the present invention is to provide a matting material with excellent film-forming performance and matting performance, and friendly odor during processing and use.

[0007] In order to achieve the above purpose, the first aspect of the present invention provides a composition for matting material, which contains: binary copolymerized polypropylene, high-density polyethylene, organic matting agent, antioxidant, acid absorbent;

[0008] Based on the total weight of binary copolymerized polypropylene, high-density polyethylene, and organic matting agent in the composition, the content of binary copolymerized polypropylene is 45-65wt%, the content of high-density polyethylene is 30-50wt%, and the content of organic matting agent is 1-14wt%; the content of antioxidant is 0.5-2wt‰, and the content of acid absorbent is 0.1-0.5wt‰;

[0009] The content of ethylene structural unit in the binary copolymerized polypropylene is 1-5wt%; the balance is propylene structural unit; the melt mass flow rate of the binary copolymerized polypropylene under the conditions of 230°C and 2.16 kg is 12-20 g / 10 min.

[0010] The second aspect of the present invention provides a method for preparing a matting material, which is carried out using the components in the composition described in the first aspect above, and includes the following steps:

[0011] (1) Perform a first mixing on the components in component A to obtain mixture I; component A contains binary copolymerized polypropylene, an antioxidant, and an acid absorbent;

[0012] (2) Perform a second mixing on the mixture I and the components in component B to obtain mixture II; component B contains high-density polyethylene, an organic matting agent, and an optionally present inorganic matting agent;

[0013] (3) Extrude and pelletize the mixture II in sequence to obtain the matting material.

[0014] The third aspect of the present invention provides a matting material prepared by the method described in the second aspect above.

[0015] The fourth aspect of the present invention provides the application of the matting material described in the third aspect above in the field of packaging materials.

[0016] The technical solution provided by the present invention has at least the following advantages:

[0017] 1) Compared with the prior art, the matting material provided by the present invention has a higher melt index and a lower macromolecule content, making the matting material have higher fluidity, reducing costs for actual production, and having good film-forming performance and better matting performance during the production process, and is more suitable for packaging high-grade foods, gifts, books, etc.

[0018] 2) During the process of preparing the matting material using the composition provided by the present invention and the prepared matting material, no unpleasant odor will be generated, bringing a better working and living experience to production workers and users, and having a broader application prospect. Detailed Embodiments

[0019] In the ranges disclosed herein, the endpoints and any values are not limited to the exact ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0020] As described above, the first aspect of the present invention provides a composition for a matting material, which composition contains: binary copolymerized polypropylene, high-density polyethylene, an organic matting agent, an antioxidant, and an acid absorbent;

[0021] Based on the total weight of the binary copolymerized polypropylene, high-density polyethylene, and organic matting agent in the composition, the content of the binary copolymerized polypropylene is 45-65 wt%, the content of the high-density polyethylene is 30-50 wt%, and the content of the organic matting agent is 1-14 wt%; the content of the antioxidant is 0.5-2 wt‰, and the content of the acid absorbent is 0.1-0.5 wt‰;

[0022] The content of the ethylene structural unit in the binary copolymerized polypropylene is 1-5 wt%; the balance is the propylene structural unit; the melt mass flow rate of the binary copolymerized polypropylene under the conditions of 230 °C and 2.16 kg is 12-20 g / 10 min.

[0023] Preferably, based on the total weight of the binary copolymerized polypropylene, high-density polyethylene, and organic matting agent in the composition, the content of the binary copolymerized polypropylene is 50-60 wt%, the content of the high-density polyethylene is 35-45 wt%, and the content of the organic matting agent is 4-10 wt%; the content of the antioxidant is 1-1.5 wt‰, and the content of the acid absorbent is 0.2-0.3 wt‰. The inventors of the present invention have found in the research that within this preferred range, the matting material provided by the present invention has better film-forming properties and more excellent matting properties.

[0024] Preferably, the content of the ethylene structural unit in the binary copolymerized polypropylene is 2-4 wt%; the balance is the propylene structural unit. The inventors of the present invention have found in the research that by using the content of the ethylene structural unit in the binary copolymerized polypropylene under this preferred condition, during the process of cooling the composition, the binary copolymerized polypropylene has a slower crystallization rate compared to the homopolypropylene, and a more obvious phase separation occurs with the crystalline polyethylene, making the surface of the film made of the composition rougher and having better matting properties.

[0025] Preferably, the melt mass flow rate of the binary copolymerized polypropylene under the conditions of 230 °C and 2.16 kg is 12-18 g / 10 min.

[0026] Preferably, the density of the high-density polyethylene is 0.94-0.96 g / cm 3 ; and the melt mass flow rate under the conditions of 190 °C and 21.6 kg is 5-20 g / 10 min, more preferably 8-15 g / 10 min.

[0027] Preferably, the high-density polyethylene is a high-density polyethylene with a unimodal or bimodal molecular weight distribution curve.

[0028] Preferably, the organic matting agent is linear low density polyethylene and / or block copolymerized polypropylene. The inventors of the present invention found in their research that the matting material prepared under this preferred condition not only has good film-forming property and matting property, but also can significantly reduce the unpleasant odor generated during the processing and use of the matting material.

[0029] More preferably, the density of the linear low density polyethylene is 0.915 - 0.935 g / cm 3 , and the melt mass flow rate at 190 °C and 21.6 kg condition is 15 - 25 g / 10 min. Under this preferred condition, not only can a matting material with ideal properties be obtained, but also the production cost of the product can be further reduced, and the economy is stronger.

[0030] More preferably, the molecular weight distribution of the block copolymerized polypropylene is 6 - 8, and the melt mass flow rate at 230 °C and 2.16 kg condition is 1.5 - 3 g / 10 min.

[0031] Preferably, the antioxidant is a hindered phenol type and / or a phosphite type antioxidant.

[0032] Preferably, the hindered phenol type antioxidant is selected from at least one of antioxidant 1010, antioxidant 330, antioxidant 3114, and antioxidant 1076; particularly preferably antioxidant 1010 and / or antioxidant 330.

[0033] Preferably, the phosphite type antioxidant is selected from at least one of antioxidant 168, antioxidant 626, and antioxidant PEP - 36; particularly preferably antioxidant 168.

[0034] More preferably, the antioxidant used in the present invention is a combination of a hindered phenol type antioxidant and a phosphite type antioxidant, and the weight ratio of the hindered phenol type antioxidant to the phosphite type antioxidant is 1:1.5 - 2.5.

[0035] Preferably, the acid absorbent is selected from at least one of calcium stearate, zinc stearate, and hydrotalcite, and more preferably hydrotalcite.

[0036] According to a preferred specific embodiment, the composition further contains an inorganic matting agent. Based on the total weight of the binary copolymerized polypropylene, high density polyethylene, and organic matting agent in the composition, the content of the inorganic matting agent is 0.001 - 3‰.

[0037] Preferably, the inorganic matting agent is selected from at least one of talc powder, wollastonite powder, mica powder, and silica; the average particle size of the inorganic matting agent is 1 - 6 μm.

[0038] According to another preferred embodiment, the binary copolymer polypropylene is a random copolymer prepared by polymerizing propylene monomer and ethylene monomer in the presence of a Ziegler-Natta catalyst.

[0039] Preferably, the weight ratio of the total weight of the propylene monomer and the ethylene monomer to the amount of the Ziegler-Natta catalyst used is 100:0.01 - 0.05, more preferably 100:0.02 - 0.03. The inventors of the present invention found in the research that when the binary copolymer polypropylene prepared under the more preferred ratio conditions is used in the matting material, the matting material can have more excellent film-forming property and matting property.

[0040] The present invention does not particularly limit the specific type of the Ziegler-Natta catalyst, as long as it can initiate the copolymerization of propylene monomer and ethylene monomer. Those skilled in the art can select according to the types of Ziegler-Natta catalysts known in the art, and the present invention will not elaborate herein. Those skilled in the art should not understand it as a limitation to the present invention.

[0041] According to a preferred embodiment, the polymerization reaction is carried out in the presence of hydrogen.

[0042] The present invention does not particularly limit the amount of hydrogen used, as long as the melt mass flow rate of the binary copolymer polypropylene product obtained after the polymerization reaction is within the range required by the present invention. The present invention will not elaborate herein. Those skilled in the art should not understand it as a limitation to the present invention.

[0043] Preferably, the conditions of the polymerization reaction include: the polymerization temperature is 55 - 85°C, preferably 60 - 80°C; the polymerization pressure is 1 - 8 MPa, preferably 1.2 - 7.5 MPa; the polymerization time is 0.5 - 3 h, preferably 0.5 - 2.5 h, more preferably 1 - 2 h.

[0044] In the present invention, the pressure refers to gauge pressure.

[0045] As described above, the second aspect of the present invention provides a method for preparing a matting material, which is carried out using the components in the composition described in the first aspect above, and includes the following steps:

[0046] (1) Perform a first mixing on the components in component A to obtain mixture I; component A contains binary copolymer polypropylene, antioxidant, and acid absorbent;

[0047] (2) Perform a second mixing on the mixture I and the components in component B to obtain mixture II; component B contains high-density polyethylene, organic matting agent, and optionally inorganic matting agent;

[0048] (3) Extrude and pelletize the mixture II in sequence to obtain the matting material.

[0049] Preferably, in steps (1) and (2), the conditions for the first mixing and the second mixing independently satisfy: the stirring speed is 50 - 300 rpm, the temperature is 25 - 65 °C, and the time is 5 - 30 min.

[0050] The inventors of the present invention found in the research that, first, the components in component A are mixed evenly and then mixed with the components in component B. By using this two-stage mixing method, the material is evenly distributed during the processing, has more stable processing performance, and makes the matting effect uniformity of the prepared matting material more excellent.

[0051] The present invention has no particular limitation on the mixing equipment used for the first mixing or the second mixing, as long as the mixing conditions required by the present invention can be achieved and the components can be mixed evenly. Exemplarily, the mixing equipment is a mixer, a kneader, an open mill or an internal mixer. The present invention will not elaborate here, and those skilled in the art should not understand it as a limitation of the present invention.

[0052] Preferably, in step (3), the extrusion is carried out in a twin-screw extruder, the extrusion temperature is 160 - 235 °C, and the main machine speed is 100 - 400 rpm.

[0053] As described above, the third aspect of the present invention provides a matting material prepared by the method described in the second aspect above.

[0054] Preferably, the melt mass flow rate of the matting material under the conditions of 230 °C and 2.16 kg is 2.5 - 10 g / 10 min, more preferably 2.5 - 5 g / 10 min. The inventors of the present invention found in the research that controlling the melt mass flow rate of the matting material within this more preferred range can make the matting material have stronger fluidity and good film-forming performance, and at the same time can maintain its excellent matting performance.

[0055] As described above, the fourth aspect of the present invention provides the application of the matting material described in the third aspect above in the field of packaging materials and / or the field of outdoor advertising printing materials.

[0056] Preferably, the field of packaging materials is the field of food packaging materials, the field of daily necessities packaging materials, and the field of book packaging materials.

[0057] The present invention will be described in detail below through examples. In the following examples, unless otherwise specified, the raw materials are all commercially available products.

[0058] The sources of the raw materials are shown in Table 1:

[0059] Table 1

[0060]

[0061] In the following examples, the total weight of binary copolymer polypropylene, high-density polyethylene, and organic matting agent is 10 kg. The dosage ratios of the components in each example and comparative example are based on the total weight of binary copolymer polypropylene, high-density polyethylene, and organic matting agent.

[0062] Preparation Example 1

[0063] In the presence of hydrogen and Ziegler-Natta catalyst, propylene monomer and ethylene monomer were subjected to polymerization reaction to prepare binary copolymer polypropylene.

[0064] The condition parameters adopted in each preparation example and comparative preparation example and the product indexes of the binary copolymer polypropylene prepared are shown in Table 2.

[0065] Table 2

[0066]

[0067] Example 1

[0068] (1) Binary copolymer polypropylene, antioxidant, and acid absorbent were mixed at 150 rpm and 35 °C for 15 min to obtain Mixture I;

[0069] (2) Mixture I was mixed with high-density polyethylene, organic matting agent, and inorganic matting agent at 150 rpm and 35 °C for 10 min to obtain Mixture II;

[0070] (3) Using a twin-screw extruder, Mixture II was extruded and pelletized to obtain a matting material;

[0071] Among them, the twin-screw extruder was processed with multi-stage heating, and the temperature of each heating section was: 170 °C, 180 °C, 190 °C, 200 °C, 210 °C, 215 °C, 225 °C, 225 °C, 195 °C, 185 °C, and the head was 175 °C; a 325-mesh filter screen was added to the head.

[0072] Examples 2-7 were all carried out using a process similar to that of Example 1, except that the types and dosages of the components used were different. For details, see Table 3.

[0073] Example 8

[0074] It was carried out using a process similar to that of Example 1, except that organic matting agent I was replaced with an equal weight of organic matting agent III;

[0075] A matting material was prepared.

[0076] Comparative Examples 1-4 were all carried out using a process similar to that of Example 1, except that the types and amounts of the components used were different. For details, see Table 3.

[0077] Comparative Example 5

[0078] It was carried out using a process similar to that of Example 1. The difference was that the binary copolymerized polypropylene PP-1 was replaced with an equal weight of binary copolymerized polypropylene DPP-2;

[0079] A matting material was prepared.

[0080] Comparative Example 6

[0081] It was carried out using a process similar to that of Example 1. The difference was that the binary copolymerized polypropylene PP-1 was replaced with an equal weight of homopolypropylene;

[0082] A matting material was prepared.

[0083] Comparative Example 7

[0084] (1) The binary copolymerized polypropylene, antioxidant, acid absorbent, high-density polyethylene, organic matting agent, and inorganic matting agent were mixed at 150 rpm and 35 °C for 15 min to obtain Mixture I;

[0085] (2) Using a twin-screw extruder, Mixture I was extruded and pelletized to obtain a matting material;

[0086] Among them, the twin-screw extruder processing used multi-stage heating, and the temperatures of each heating section were: 170 °C, 180 °C, 190 °C, 200 °C, 210 °C, 215 °C, 225 °C, 225 °C, 195 °C, 185 °C, and the head was 175 °C; a 325-mesh filter screen was added to the head.

[0087] Table 3

[0088]

[0089] Continued Table 3

[0090]

[0091]

[0092] Test Example

[0093] Films were prepared using the matting materials prepared in the foregoing examples and comparative examples. Specifically:

[0094] The matting material is melted in a twin-screw extruder, and the temperatures of the extruder are 230 °C, 240 °C, 245 °C, 250 °C, 250 °C, 250 °C, 250 °C, 250 °C, 250 °C. The melt is extruded into a film through a slit (slit gap is 0.5 mm) on a T-shaped die head. The extruded film is attached to a cooling roll by compressed air ejected from an air knife. During the process of the extruded film passing through the cooling roll, the extruded film is finally formed into a film with a thickness of 30 μm due to the stretching and thinning effect.

[0095] Melt mass flow rate (MFR): It is measured according to the method specified in GB / T 3682-2000. Specifically, the test temperature for binary copolymer polypropylene is 230 °C and the load is 2.16 kg. The test temperature for high-density polyethylene is 190 °C and the load is 21.6 kg. The test method for the melt mass flow rate of each matting material is the same as that of binary copolymer polypropylene.

[0096] Haze: It is measured according to the method specified in GB / T 2410-2008, where the thickness of the test sample film is 30 μm.

[0097] Transmittance: It is measured according to the method specified in GB / T 2410-2008, where the thickness of the test sample film is 30 μm.

[0098] Specular gloss: It is measured according to the method specified in GB / T 8807-1988, where the thickness of the test sample film is 30 μm.

[0099] Relative roughness: Using the tapping mode of an atomic force microscope, the prepared film is measured within a range of 100 μm 2 of.

[0100] Odor evaluation test method: It is carried out according to the method specified in SH / T 1828-2020, the test temperature is 80 °C, and the test time is 2 h. A panel consisting of five people trained in odor evaluation rates its odor. The odor levels should comply with the provisions of Table 4. The odor levels are divided into Level 1 to Level 6, and it is also allowed to have situations between two judgment levels, and a half-level rating can be taken (such as 3.5, 4.5, etc.). If the ratings of the panel members differ by two levels or more, retest. The test results are expressed as the arithmetic mean of the ratings of the five-person panel, accurate to one decimal place.

[0101] Table 4

[0102] Level Description 1 Odorless 2 Has an odor, but no disturbing odor 3 Has an obvious odor, but no disturbing odor 4 Has a disturbing odor 5 Has a strong disturbing odor 6 Has an intolerable odor

[0103] The specific results of each property are shown in Table 5.

[0104] Table 5

[0105]

[0106] Continued Table 5

[0107]

[0108] As can be seen from the above results, the matting material prepared by adopting the technical solution provided by the present invention has a higher melt mass flow rate, and has good film-forming performance and better matting performance during the production process. In addition, during the process of preparing the matting material by adopting the composition provided by the present invention and the prepared matting material, no unpleasant smell will be generated. It is more suitable for the packaging of high-grade foods, gifts, books, etc.

[0109] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including any other suitable combination of each technical feature. These simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A composition for a matting material, characterized in that, The composition contains: binary copolymerized polypropylene, high-density polyethylene, organic matting agent, antioxidant, acid absorbent; Based on the total weight of the binary copolymerized polypropylene, high-density polyethylene, and organic matting agent in the composition, the content of the binary copolymerized polypropylene is 45-65 wt%, the content of the high-density polyethylene is 30-50 wt%, and the content of the organic matting agent is 1-14 wt%; the content of the antioxidant is 0.5-2 wt‰, and the content of the acid absorbent is 0.1-0.5 wt‰; The content of the ethylene structural unit in the binary copolymerized polypropylene is 1-5 wt%; the balance is the propylene structural unit; the melt mass flow rate of the binary copolymerized polypropylene under the conditions of 230 °C and 2.16 kg is 12-20 g / 10 min.

2. The composition according to claim 1, wherein The density of the high-density polyethylene is 0.94 - 0.96 g / cm 3 , and the melt mass flow rate under the conditions of 190 °C and 21.6 kg is 5 - 20 g / 10 min.

3. The composition according to claim 1 or 2, characterized in that, The organic matting agent is linear low-density polyethylene and / or block copolymerized polypropylene; Preferably, the density of the linear low density polyethylene is 0.915-0.935 g / cm 3 , and the melt mass flow rate at 190 °C and 21.6 kg is 15-25 g / 10 min; Preferably, the molecular weight distribution of the block copolymerized polypropylene is 6-8, and the melt mass flow rate under the conditions of 230 °C and 2.16 kg is 1.5-3 g / 10 min.

4. The composition according to any one of claims 1-3, characterized in that The antioxidant is a hindered phenol type and / or a phosphite type antioxidant; and / or, The acid absorbent is selected from at least one of calcium stearate, zinc stearate, and hydrotalcite.

5. The composition according to any one of claims 1-4, characterized in that, The composition further contains an inorganic matting agent. Based on the total weight of the binary copolymerized polypropylene, high-density polyethylene, and organic matting agent in the composition, the content of the inorganic matting agent is 0.001-3‰; and / or, The inorganic matting agent is selected from at least one of talc powder, wollastonite powder, mica powder, and silica; the average particle size of the inorganic matting agent is 1-6 μm.

6. The composition according to any one of claims 1-5, characterized in that, The binary copolymerized polypropylene is a random copolymer prepared by polymerizing an acrylonitrile monomer and an ethylene monomer in the presence of a Ziegler-Natta catalyst; Preferably, the weight ratio of the total weight of the acrylonitrile monomer and the ethylene monomer to the amount of the Ziegler-Natta catalyst used is 100:0.01-0.05; Preferably, the conditions of the polymerization reaction include: the polymerization temperature is 55-85 °C, the polymerization pressure is 1-8 MPa, and the polymerization time is 0.5-2.5 h.

7. A method for preparing a matting material, characterized in that, Using the components in the composition according to any one of claims 1-6, including the following steps: (1) First mix the components in component A to obtain mixture I; component A contains binary copolymerized polypropylene, antioxidant, and acid absorbent; (2) Second mix the mixture I with the components in component B to obtain mixture II; component B contains high-density polyethylene, organic matting agent, and optionally an inorganic matting agent; (3) Extrude and granulate the mixture II in sequence to obtain the matting material.

8. The method according to claim 7, characterized in that In steps (1) and (2), the conditions of the first mixing and the second mixing independently satisfy: the stirring speed is 50-300 rpm, the temperature is 25-65 °C, and the time is 5-30 min; and / or, In step (3), the extrusion is carried out in a twin-screw extruder. The temperature of the extrusion is 160 - 235 °C, and the main machine rotation speed is 100 - 400 rpm.

9. An extinction material prepared by the method according to claim 7 or 8; Preferably, the melt mass flow rate of the extinction material at 230 °C and 2.16 kg is 2.5 - 10 g / 10 min.

10. The application of the extinction material according to claim 9 in the field of packaging materials and / or the field of outdoor advertising printing materials; Preferably, the field of packaging materials is the field of food packaging materials, the field of daily necessities packaging materials, and the field of book packaging materials.

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