Antistatic suede matte pre-coating film and method for manufacturing the same

Abstract

This invention discloses an antistatic, velvety matte pre-coated film and its preparation method, belonging to the field of pre-coated film technology. The pre-coated film includes a BOPP pre-coated film and a coating layer. The coating layer comprises the following raw materials in parts by weight: 100 parts waterborne polyurethane, 5-10 parts nano-ultrafine fumed silica, 10-20 parts quaternary ammonium salt, 5-10 parts modified nano-titanium dioxide, 5-10 parts wetting agent, 4-6 parts defoamer, 6-8 parts dispersant, and 10-20 parts white graphene. This solves the problem of uneven coating caused by static electricity during use, improves haze uniformity, and provides a better velvety feel.

Description

Technical Field

[0001] This invention belongs to the field of pre-coated film technology, specifically relating to an antistatic velvety matte pre-coated film and its preparation method. Background Technology

[0002] BOPP pre-coated film is a composite film formed by laminating polypropylene film and EVA hot melt adhesive. Its unique properties not only improve the shortcomings of ordinary polypropylene film, but also effectively bring out the superior performance of polypropylene film. It has good waterproofness, high transparency, good gloss and stable chemical properties, and is often used for outer packaging and wedding photography products.

[0003] However, existing BOPP pre-coated films exhibit high static electricity, a rough feel, and poor haze uniformity during use. Therefore, a special coating is used to improve its performance, achieving a silky smooth feel and antistatic effect. This method solves the problem of precipitation and adhesion caused by directly adding antistatic agents to BOPP, improves antistatic stability, and reduces waste during the coating process.

[0004] Existing coatings primarily consist of oil-based polyurethane mixed with calcium powder, talc, and other additives. Poor coating adhesion leads to uneven tactile feel, poor abrasion resistance, and powder shedding. Therefore, thickening the coating is used to improve performance and achieve uniform abrasion resistance. While this method extends the time the coating is worn away, resulting in a uniform tactile feel and abrasion resistance, the resulting BOPP pre-coated film is thick and heavy, masking the lightweight advantage of BOPP film.

[0005] Therefore, the present invention proposes an antistatic velvety matte pre-coated film. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide an antistatic, velvety matte pre-coated film and its preparation method, thereby solving the problems in the prior art.

[0007] The objective of this invention can be achieved through the following technical solutions: An antistatic, velvety matte pre-coated film includes a BOPP pre-coated film and a coating, wherein the coating comprises the following raw materials in parts by weight: 100 parts of waterborne polyurethane; 5-10 parts of nano-ultrafine fumed silica; 10-20 parts of quaternary ammonium salt; 5-10 parts of modified nano-titanium dioxide; 5-10 parts wetting agent; 4-6 parts of defoamer; 6-8 parts dispersant; 10-20 parts of white graphene.

[0008] Furthermore, the thickness ratio of the coating to the BOPP pre-coated film is 1:(4-10).

[0009] Furthermore, the solid content of the waterborne polyurethane is 10-15%.

[0010] Furthermore, the particle size of the nano-ultrafine fumed silica is 20-40 nm.

[0011] Further, the quaternary ammonium salt is any one of the following: organosilicon quaternary ammonium salt, hexadecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride, fluorocarbon quaternary ammonium salt, polydimethyldiallylammonium chloride, and polyquaternary ammonium salt-7.

[0012] Furthermore, the modification process of the modified nano-titanium dioxide is as follows: polyvinyl alcohol, polyacrylic acid and polyurethane are grafted onto the TiO2 surface through in-situ polymerization or solution blending.

[0013] Furthermore, the wetting agent is selected from one or more of the following: polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, polyoxyethylene polyoxypropylene block copolymer, and sodium alkyl sulfonate.

[0014] Furthermore, the defoamer is any one or more of the following: silicone-modified defoamer, polyether-modified defoamer, or mineral oil-based defoamer.

[0015] Furthermore, the dispersant is a mixture of tetradecyltrimethylammonium chloride and fatty acid polyethylene glycol ester in a mass ratio of 4:1.

[0016] The above-mentioned method for preparing an antistatic, velvety matte pre-coated film includes the following steps: Waterborne polyurethane, nano-ultrafine fumed silica, quaternary ammonium salt, modified nano-titanium dioxide, dispersant and white graphene are mixed and stirred evenly; wetting agent and defoamer are added, and the mixture is thoroughly stirred and dispersed in a constant temperature water bath to obtain a fluid. The fluid is rolled onto the outer layer of the BOPP pre-coated film and then dried. The dried pre-coated film is then cured to obtain the final product.

[0017] The beneficial effects of this invention are: 1. This invention improves the antistatic performance of a product by adding quaternary ammonium salt and white graphene to the coating. The combined use of quaternary ammonium salt and white graphene achieves a synergistic effect of ionic conductivity and structural dissipation: the quaternary ammonium salt provides rapid antistatic properties on the surface, while the white graphene constructs a charge dissipation network within the matrix.

[0018] 2. This invention adds nano-ultrafine fumed silica to the coating. The aggregates of nano-ultrafine fumed silica are loosely chain-like and can roll or slide under external force, similar to the friction-reducing effect of tiny ball bearings. The tactile sensation is smooth and delicate, thus increasing the velvety and silky effect.

[0019] 3. This invention improves the uniformity of haze by adding modified nano-titanium dioxide into the coating. The modified nano-TiO2 particles have a uniform size (typically 10–50 nm) and a stable refractive index difference with the coating resin. Each particle is a uniform light scattering center. The uniformly distributed scattering units will diffusely reflect the incident light in all directions with equal intensity, avoiding excessively strong or weak local scattering, thereby achieving the uniformity of overall haze and improving the uniformity of appearance haze. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] An antistatic, velvety matte pre-coated film includes a BOPP pre-coated film and a coating layer, wherein the thickness ratio of the coating layer to the BOPP pre-coated film is 1:(4-10); the coating layer comprises the following raw materials in parts by weight: 100 parts of waterborne polyurethane; 5-10 parts of nano-ultrafine fumed silica; 10-20 parts of quaternary ammonium salt; 5-10 parts of modified nano-titanium dioxide; 5-10 parts wetting agent; 4-6 parts of defoamer; 6-8 parts dispersant; 10-20 parts of white graphene.

[0022] The BOPP pre-coated film is prepared by an extrusion lamination process, the specific process of which is as follows: S1, the hot melt adhesive particles (EVA from Hanwha Total 181L in South Korea) are heated to a molten state (EVA 210℃) and extruded into a tape through a T-die; S2, BOPP base film (Anhui Guofeng PTSF) is treated with 10KW corona and then pressed with S1 composite cooling roller (900mm diameter, circulating water temperature 25℃) at a composite pressure of 0.5 MPa and a linear speed of 300 m / min. After lamination, the film is trimmed (20mm on one side) and the thickness is measured. The adhesive surface (EVA casting surface) is then treated with 15KW corona and wound up to become a ready-to-use BOPP pre-coated film.

[0023] The solid content of waterborne polyurethane is 10-15% (mass fraction).

[0024] The particle size of nano-ultrafine fumed silica is 20-40 nm.

[0025] The quaternary ammonium salt is any one of the following: organosilicon quaternary ammonium salt, hexadecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride, fluorocarbon quaternary ammonium salt, polydimethyldiallylammonium chloride, and polyquaternary ammonium salt-7.

[0026] The modification process of modified nano-titanium dioxide is as follows: polyvinyl alcohol, polyacrylic acid and polyurethane are grafted onto the TiO2 surface through in-situ polymerization or solution blending.

[0027] The wetting agent is selected from one or more of the following: polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, polyoxyethylene polyoxypropylene block copolymer, and sodium alkyl sulfonate. Specifically, the polyoxyethylene alkylphenol ether is dodecylphenol polyoxyethylene ether (e.g., TX-10, TX-15); the polyoxyethylene fatty alcohol ether is lauryl alcohol polyoxyethylene ether (e.g., AEO-3, AEO-9, AEO-20); the polyoxyethylene polyoxypropylene block copolymer is polyether L series (e.g., L-61, L-64, L-101) or polyether F series (e.g., F-68, F-127); and the sodium alkyl sulfonate is sodium dodecyl sulfonate (SDS), sodium tetradecyl sulfonate, or sodium hexadecyl sulfonate.

[0028] The defoamer is any one or more of the following: silicone-modified defoamer, polyether-modified defoamer, or mineral oil-based defoamer. Specifically, the silicone-modified defoamer is manufactured by BYK Chemical, brand name: BYK-066N; the polyether-modified defoamer is manufactured by a domestic company (Maier Chemical), brand name: HY-037; and the mineral oil-based defoamer is manufactured by BASF, brand name: Foamaster MO 2152.

[0029] The dispersant is a mixture of tetradecyltrimethylammonium chloride and fatty acid polyethylene glycol ester; the weight ratio of the tetradecyltrimethylammonium chloride and fatty acid polyethylene glycol ester is 4:1.

[0030] The fatty acid polyethylene glycol ester is selected from stearic acid polyethylene glycol ester (such as PEG-400 stearate, PEG-600 stearate or PEG-1000 stearate) or lauric acid polyethylene glycol ester (such as PEG-200 laurate or PEG-400 laurate).

[0031] The white graphene particles have a diameter of 5-15 μm.

[0032] The preparation method of the above-mentioned antistatic velvety matte pre-coated film includes the following steps: Step 1: Thoroughly mix the above-mentioned waterborne polyurethane, nano-ultrafine fumed silica, quaternary ammonium salt, modified nano-titanium dioxide, dispersant and white graphene in the specified weight proportions. Step 2: After completing Step 1, add wetting agent and defoamer, and stir thoroughly in a constant temperature water bath at 20-25℃ for 60 minutes to obtain the fluid; Step 3: Use a circulating doctor blade coater to roll-coat the fluid obtained in Step 2 onto the outer layer of the BOPP pre-coated film; Step 4: Place the coated BOPP pre-coated film into a drying oven to dry. The oven temperature is 40-50℃ and the drying speed is 40-50m / min. Step 5: Transfer the pre-coated film dried in Step 4 into a sealed curing chamber at 30 degrees Celsius. The curing chamber is heated with lamps for 12 hours. Then, pull it out and let it sit under self-heating conditions for 12 hours before cutting it into finished products.

[0033] The technical solution of the present invention will be described below through the following embodiments and comparative examples; wherein, the raw materials used in the embodiments and comparative examples are from the following sources: BOPP pre-coated film was prepared by the above method; The manufacturer of the waterborne polyurethane is BASF; the grade is Bayhydrol XP 2655. Manufacturer of nano-fine fumed silica: Evonik; grade: AEROSIL 200 / 300; The manufacturer of the modified nano titanium dioxide is Hangzhou Jikang New Materials; grade: SS-T200S; The manufacturer of the white graphene is Qingdao Xinggang Graphite; grade: XG-BN-100.

[0034] The quaternary ammonium salt is specifically hexadecyltrimethylammonium chloride (1631); manufacturer: Shanghai Shengwei Chemical; grade: 1631; The wetting agent is sodium dodecyl sulfonate (SDS), manufactured by Evonik (TEGO); brand name: TEGOWet 270. The defoamer is specifically a silicone-modified defoamer; manufacturer: BYK Chemicals; brand: BYK-066N; The dispersant is a mixture of tetradecyltrimethylammonium chloride (manufacturer: Jiangsu Haian Petrochemical, brand name: TTAC1431) and fatty acid polyethylene glycol ester (specifically PEG-400 stearate, manufacturer: Jiangsu Haian Petrochemical, brand name: PEG400DS) in a mass ratio of 4:1. Example 1 An antistatic, velvety matte pre-coated film includes: a BOPP pre-coated film and a coating layer; the thickness ratio of the coating layer to the BOPP pre-coated film is 1:5. The coating comprises the following raw materials in parts by weight, each of which weighs 10 kg: 100 parts of waterborne polyurethane; Five parts of nano-ultrafine fumed silica; 10 parts of quaternary ammonium salt; 5 parts of modified nano-titanium dioxide; 5 parts wetting agent; 4 parts defoamer; 6 parts dispersant; 10 parts of white graphene.

[0035] The preparation method of this antistatic velvety matte pre-coated film includes: Step 1: Thoroughly mix the predetermined amounts of waterborne polyurethane, nano-ultrafine fumed silica, quaternary ammonium salt, modified nano-titanium dioxide, dispersant and white graphene. Step 2: After completing Step 1, add wetting agent and defoamer, and stir thoroughly in a constant temperature water bath at 23°C for 60 minutes to disperse. Step 3: Use a circulating doctor blade coater to roll-coat the fluid completed in step 2 onto the outer layer of the BOPP pre-coated film; Step 4: Place the coated BOPP pre-coated film into a drying oven at a temperature of 47°C and a drying speed of 42 m / min. After drying, rewind the film. Step 5: Transfer the pre-coated film dried in Step 4 into a sealed curing chamber at 30 degrees Celsius. The curing chamber is heated with lamps for 12 hours. Then, pull it out and place it under self-heating conditions for 12 hours before cutting it into finished products.

[0036] Example 2 An antistatic, velvety matte pre-coated film includes: a BOPP pre-coated film and a coating layer; the thickness ratio of the coating layer to the BOPP pre-coated film is 1:10. The coating comprises the following raw materials in parts by weight, each of which weighs 10 kg: 100 parts of waterborne polyurethane; 10 parts of nano-ultrafine fumed silica; 20 parts of quaternary ammonium salt; 10 parts of modified nano-titanium dioxide; 10 parts wetting agent; 6 parts defoamer; 8 parts dispersant; 20 parts of white graphene.

[0037] The preparation method of this antistatic velvety matte pre-coated film includes: Step 1: Thoroughly mix the predetermined amounts of waterborne polyurethane, nano-ultrafine fumed silica, quaternary ammonium salt, modified nano-titanium dioxide, dispersant and white graphene. Step 2: After completing Step 1, add wetting agent and defoamer, and stir thoroughly in a constant temperature water bath at 23°C for 60 minutes to disperse. Step 3: Use a circulating doctor blade coater to roll-coat the fluid completed in step 2 onto the outer layer of the BOPP pre-coated film; Step 4: Place the coated BOPP pre-coated film into a drying oven at a temperature of 45℃ and a drying speed of 50m / min. After drying, rewind the film. Step 5: Transfer the pre-coated film dried in Step 4 into a sealed curing chamber at 30 degrees Celsius. The curing chamber is heated with lamps for 12 hours. Then, pull it out and place it under self-heating conditions for 12 hours before cutting it into finished products.

[0038] Example 3 An antistatic, velvety matte pre-coated film includes: a BOPP pre-coated film and a coating layer; the thickness ratio of the coating layer to the BOPP pre-coated film is 1:8. The coating comprises the following raw materials in parts by weight, each of which weighs 10 kg: 100 parts of waterborne polyurethane; Eight parts of nano-ultrafine fumed silica; 20 parts of quaternary ammonium salt; 5 parts of modified nano-titanium dioxide; 5 parts wetting agent; 4 parts defoamer; 6 parts dispersant; 20 parts of white graphene.

[0039] The preparation method of this antistatic velvety matte pre-coated film includes: Step 1: Thoroughly mix the predetermined amounts of waterborne polyurethane, nano-ultrafine fumed silica, quaternary ammonium salt, modified nano-titanium dioxide, dispersant and white graphene. Step 2: After completing Step 1, add wetting agent and defoamer, and stir thoroughly in a constant temperature water bath at 23°C for 60 minutes to disperse. Step 3: Use a circulating doctor blade coater to roll-coat the fluid completed in step 2 onto the outer layer of the BOPP pre-coated film; Step 4: Place the coated BOPP pre-coated film into a drying oven at a temperature of 45℃ and a drying speed of 45m / min. After drying, rewind the film. Step 5: Transfer the pre-coated film dried in Step 4 into a sealed curing chamber at 30 degrees Celsius. The curing chamber is heated with lamps for 12 hours. Then, pull it out and place it under self-heating conditions for 12 hours before cutting it into finished products.

[0040] Comparative Example 1 The only difference between this comparative example and Example 1 is that no quaternary ammonium salt and white graphene are added; specifically, a pre-coated film includes: a BOPP pre-coated film and a coating layer; the thickness ratio of the coating layer to the BOPP pre-coated film is 1:5. The coating comprises the following raw materials in parts by weight, each of which weighs 10 kg: 100 parts of waterborne polyurethane; Five parts of nano-ultrafine fumed silica; 5 parts of modified nano-titanium dioxide; 5 parts wetting agent; 4 parts defoamer; 6 parts dispersant; The method for preparing the pre-coated film includes: Step 1: Thoroughly mix the predetermined amounts of waterborne polyurethane, nano-ultrafine fumed silica, modified nano-titanium dioxide, and dispersant. Step 2: After completing Step 1, add wetting agent and defoamer, and stir thoroughly in a constant temperature water bath at 23°C for 60 minutes to disperse. Step 3: Use a circulating doctor blade coater to roll-coat the fluid completed in step 2 onto the outer layer of the BOPP pre-coated film; Step 4: Send the coated BOPP pre-coated film into the drying oven to dry. The oven temperature is 47℃ and the drying speed is 42m / min. After drying, the film is rolled up. Step 5: Transfer the pre-coated film dried in Step 4 into a sealed curing chamber at 30 degrees Celsius. The curing chamber is heated with lamps for 12 hours. Then, pull it out and place it under self-heating conditions for 12 hours before cutting it into finished products.

[0041] Comparative Example 2 The only difference between this comparative example and Example 1 is that: no nano-ultrafine fumed silica is added; specifically: the pre-coated film includes: a BOPP pre-coated film and a coating; the thickness ratio of the coating to the BOPP pre-coated film is 1:5; The coating comprises the following raw materials in parts by weight, each of which weighs 10 kg: 100 parts of waterborne polyurethane; 10 parts of quaternary ammonium salt; 5 parts of modified nano-titanium dioxide; 5 parts wetting agent; 4 parts defoamer; 6 parts dispersant; 10 parts of white graphene.

[0042] The method for preparing the pre-coated film includes: Step 1: Thoroughly mix the predetermined amounts of waterborne polyurethane, quaternary ammonium salt, modified nano titanium dioxide, dispersant and white graphene. Step 2: After completing Step 1, add wetting agent and defoamer, and stir thoroughly in a constant temperature water bath at 23°C for 60 minutes to disperse. Step 3: Use a circulating doctor blade coater to roll-coat the fluid completed in step 2 onto the outer layer of the BOPP pre-coated film; Step 4: Send the coated BOPP pre-coated film into the drying oven to dry. The oven temperature is 47℃ and the drying speed is 42m / min. After drying, the film is rolled up. Step 5: Transfer the pre-coated film dried in Step 4 into a sealed curing chamber at 30 degrees Celsius. The curing chamber is heated with lamps for 12 hours. Then, pull it out and place it under self-heating conditions for 12 hours before cutting it into finished products.

[0043] Comparative Example 3 The only difference between this comparative example and Example 1 is that no modified nano-titanium dioxide is added; specifically, a pre-coated film includes: a BOPP pre-coated film and a coating; the thickness ratio of the coating to the BOPP pre-coated film is 1:5; The coating comprises the following raw materials in parts by weight, each of which weighs 10 kg: 100 parts of waterborne polyurethane; Five parts of nano-ultrafine fumed silica; 10 parts of quaternary ammonium salt; 5 parts wetting agent; 4 parts defoamer; 6 parts dispersant; 10 parts of white graphene.

[0044] The preparation method of this antistatic velvety matte pre-coated film includes: Step 1: Thoroughly mix the predetermined amounts of waterborne polyurethane, nano-ultrafine fumed silica, quaternary ammonium salt, dispersant, and white graphene. Step 2: After completing Step 1, add wetting agent and defoamer, and stir thoroughly in a constant temperature water bath at 23°C for 60 minutes to disperse. Step 3: Use a circulating doctor blade coater to roll-coat the fluid completed in step 2 onto the outer layer of the BOPP pre-coated film; Step 4: Send the coated BOPP pre-coated film into the drying oven to dry. The oven temperature is 47℃ and the drying speed is 42m / min. After drying, the film is rolled up. Step 5: Transfer the pre-coated film dried in Step 4 into a sealed curing chamber at 30 degrees Celsius. The curing chamber is heated with lamps for 12 hours. Then, pull it out and place it under self-heating conditions for 12 hours before cutting it into finished products.

[0045] Experimental Test The pre-coated films prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to the following performance tests to verify the superiority of the technical solution of the present invention; The test items include: For the four core performance characteristics of tactile pre-coated films, the following are the industry-standard testing methods, implementation standards, and units of measurement, suitable for industrial testing and quality control: 1) Antistatic properties 1. Test method: Direct measurement of electrostatic voltage; Execution standard: ANSI / ESD STM11.12 Electrostatic Voltage Measurement Method; Unit: kV; Sample pretreatment: Placed at 23±2℃ and 50±5% humidity for 24 hours.

[0046] 2. Instruments and measurement parameters; Non-contact type: Pre-coated film is preferred, such as FMX-003 / TREK520, with an accuracy of ±1% and a range of ±0~±30kV; Measurement distance: 5cm from the non-contact probe to the membrane surface (this distance is standardized); Environmental standards: temperature 23±2℃, relative humidity 50±5%RH; sample conditioning ≥24h; Measurement points: 3 points for membrane width and 3 points for length, take the average value; synchronize the membrane speed on the production line and avoid interference sources such as ion air nozzles; 3. Judgment threshold (pre-coated film scenario); General pre-coated film ≤±5kV>±15kV (dust adsorption, uneven winding).

[0047] 2) Velvety and silky smoothness Silky smoothness (coefficient of friction method) Test method: Static / dynamic friction coefficient method 1. Use a friction coefficient meter (such as the MXD-01 model) to test the sample by contacting it with a standard friction material (such as glass or stainless steel).

[0048] 2. Test and record the static friction coefficient (μs) and dynamic friction coefficient (μk), and take the average value of 3 parallel samples.

[0049] Implementation Standard: GB / T 10006-1988 "Method for Determination of Coefficient of Friction of Plastic Films and Sheets" Unit: Dimensionless (ratio) Judgment criteria: The coefficient of kinetic friction is usually ≤0.3. The lower the value, the more obvious the silky feel.

[0050] 3) Appearance haze uniformity Test method: Multi-point haze test + uniformity calculation; 1. Using a haze meter, measure the haze value of each point on the sample surface using a grid method (e.g., 5×5 grid, 25 test points in total).

[0051] 2. Calculate uniformity: Uniformity (%) = [1 - (maximum haze value - minimum haze value) / average haze value] × 100%; Implementation standard: Referencing GB / T 2410-2008, combined with industry internal control standards; Unit: % (percentage); Judgment requirements: The uniformity of fog is ≥95%, that is, the fog deviation at each point is ≤5%, which is considered to be qualified for uniformity.

[0052] 4) Wear resistance Test method: Taber abrasion test (mainstream); 1. After sample pretreatment, fix it on the Taber abrasion tester (such as Taber 5135), select the specified grinding wheel (such as CS-10 grinding wheel), and apply a load (usually 500g or 1000g).

[0053] 2. Set the number of rotations of the grinding wheel (e.g., 500 rpm, 1000 rpm). After the test, weigh the mass loss of the sample before and after wear using a balance, or use a haze meter to test the haze retention rate of the worn area.

[0054] Implementation Standard: Mass loss method: GB / T 1768-2006 "Determination of abrasion resistance of paints and varnishes - Rotating rubber grinding wheel method"; Mass loss method: mg (milligram); Judgment requirements: If the mass loss after 500 revolutions is ≤5mg, or the haze retention rate is ≥85%, the wear resistance is considered qualified.

[0055] The test results are shown in Table 1: Table 1 Performance test results of the pre-coated films prepared in Examples 1-3 and Comparative Examples 1-3 Based on the test results in Table 1, the following analysis is made: 1. Analysis of the tests of Comparative Example 1 and Example 1 shows that the test result of Example 1 with added quaternary ammonium salt and white graphene is 0.51KV, and the antistatic effect is significantly better than that of Comparative Example 1 with a test result of 12.36KV. This indicates that adding quaternary ammonium salt and white graphene to the coating can effectively improve the antistatic performance of the product.

[0056] 2. Analysis of the tests of Comparative Example 2 and Example 1 shows that the test result of Example 1 with added nano-ultrafine fumed silica is 0.21, and the velvet and silky smoothness is significantly better than that of Comparative Example 2 with a test result of 0.27. This indicates that adding nano-ultrafine fumed silica to the coating can increase the velvet and silky smoothness effect.

[0057] 3. Analysis of the tests of Comparative Example 3 and Example 1 shows that the test result of Example 1 with modified nano titanium dioxide added is 97%, and the haze uniformity effect is significantly better than that of Comparative Example 3 (94%). This indicates that adding modified nano titanium dioxide into the coating can improve the uniformity of the haze.

[0058] 4. By analyzing Examples 1-3, it can be seen that: 1) The antistatic properties are positively correlated with the ratio of additives, but as the amount of additives increases, precipitation will occur, affecting the wear resistance. 2) The addition of nano-ultrafine fuzzy dioxide not only affects the smoothness of the velvet feel, but also directly affects the wear resistance. 3) The haze and the total thickness of the coating are related to the proportion of modified nano-titanium dioxide added. The thicker the coating and the higher the proportion of modified nano-titanium dioxide added, the better the haze uniformity. However, a high addition ratio results in poor dispersion and coating, which will also affect the wear resistance.

[0059] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0060] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An antistatic, velvety matte pre-coated film, comprising a BOPP pre-coated film and a coating layer, characterized in that, The coating comprises the following raw materials in parts by weight: 100 parts of waterborne polyurethane; 5-10 parts of nano-ultrafine fumed silica; 10-20 parts of quaternary ammonium salt; 5-10 parts of modified nano-titanium dioxide; 5-10 parts wetting agent; 4-6 parts of defoamer; 6-8 parts dispersant; 10-20 parts of white graphene.

2. The antistatic, velvety matte pre-coated film according to claim 1, characterized in that, The thickness ratio of the coating to the BOPP pre-coated film is 1:(4-10).

3. The antistatic, velvety matte pre-coated film according to claim 1, characterized in that, The solid content of the waterborne polyurethane is 10-15%.

4. The antistatic, velvety matte pre-coated film according to claim 1, characterized in that, The particle size of the nano-ultrafine fumed silica is 20-40 nm.

5. The antistatic, velvety matte pre-coated film according to claim 1, characterized in that, The quaternary ammonium salt is any one of the following: organosilicon quaternary ammonium salt, hexadecyltrimethylammonium chloride, dodecyldimethylbenzylammonium chloride, fluorocarbon quaternary ammonium salt, polydimethyldiallylammonium chloride, and polyquaternary ammonium salt-7.

6. The antistatic, velvety matte pre-coated film according to claim 1, characterized in that, The modification process of the modified nano-titanium dioxide is as follows: polyvinyl alcohol, polyacrylic acid and polyurethane are grafted onto the TiO2 surface through in-situ polymerization or solution blending.

7. The antistatic, velvety matte pre-coated film according to claim 1, characterized in that, The wetting agent is selected from one or more of the following: polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether, polyoxyethylene polyoxypropylene block copolymer, and sodium alkyl sulfonate.

8. The antistatic, velvety matte pre-coated film according to claim 1, characterized in that, The defoamer is any one or more of the following: silicone-modified defoamer, polyether-modified defoamer, or mineral oil-based defoamer.

9. The antistatic, velvety matte pre-coated film according to claim 1, characterized in that, The dispersant is a mixture of tetradecyltrimethylammonium chloride and fatty acid polyethylene glycol ester in a mass ratio of 4:

1.

10. A method for preparing an antistatic, velvety matte pre-coated film according to any one of claims 1-9, characterized in that, Includes the following steps: Waterborne polyurethane, nano-ultrafine fumed silica, quaternary ammonium salt, modified nano-titanium dioxide, dispersant and white graphene are mixed and stirred evenly; wetting agent and defoamer are added, and the mixture is thoroughly stirred and dispersed in a constant temperature water bath to obtain a fluid. The fluid is rolled onto the outer layer of the BOPP pre-coated film and then dried. The dried pre-coated film is then cured to obtain the final product.

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