Preparation method of pp material for gags decorative film

Abstract

The application provides a preparation method of a PP material for a GAG decorative film, and the preparation method comprises the following steps: step 1, preparing an acrylic resin; step 2, uniformly mixing PP resin, the acrylic resin, a mixed resin polymer and a modified filler in a weight ratio of 1:(0.3-0.5):(0.1-0.2):(0.06-0.09), adding the mixture into a double-screw extruder, heating to 170-175 DEG C, mixing for 2-3 hours, extruding and granulating to obtain a mixed resin; and step 3, uniformly mixing 55-60 parts of the mixed resin, 25-30 parts of wood powder and 1-2 parts of polyethylene wax, adding the mixture into the double-screw extruder, heating and mixing at 147-150 DEG C for 1-2 hours, adding the mixture into a winding film system machine to perform film preparation, and obtaining the PP material for the GAG decorative film. The PP material is used for a decorative film on a furniture surface, and has excellent comprehensive performance such as fingerprint resistance and scratch resistance.

Description

Technical Field

[0001] This invention belongs to the field of PP material technology, specifically relating to a method for preparing PP material for GAG decorative films. Background Technology

[0002] Applying decorative film to furniture surfaces is becoming increasingly popular, offering protection, enhanced aesthetics, and extended lifespan. Specific benefits include: Prevention of scratches and wear: Decorative films can withstand minor bumps and scratches from daily use, keeping the furniture surface intact; Stain resistance: Decorative films typically have waterproof and oil-proof properties, preventing liquids and food residue from penetrating the furniture surface and facilitating cleaning; High-temperature resistance: Some decorative films have heat-insulating properties, preventing burns from direct contact with hot objects; Aesthetic enhancement: Decorative films are available in various colors, patterns, and textures to suit different decorating styles, making the furniture appear more beautiful. The benefits of applying decorative film include: Enhanced visual appeal; Renewal of old furniture: Old furniture can be given a fresh new look by applying film, changing its appearance and updating the home environment without replacing the furniture; Increased durability: Some decorative films can provide additional physical strength, making the furniture surface more durable; Economic efficiency: Cost-effective: Compared to repainting or replacing furniture, applying decorative film is a lower cost, making it an economical way to maintain and upgrade; Easy maintenance: Convenient cleaning: The smooth surface of the decorative film makes it easy to clean stains, reducing the complexity of maintaining the furniture surface; Personalization: Patterns and textures can be customized according to personal preferences, achieving personalized decoration and meeting specific aesthetic needs. In conclusion, applying decorative film to the surface of furniture not only protects furniture from daily use damage but also enhances its aesthetics and functionality, making it a practical and economical means of furniture maintenance and decoration.

[0003] GAG decorative film refers to a thin film material used on the surface of indoor furniture. This film usually comes in various colors, patterns, and textures and can be applied to the surface of furniture to change its appearance and enhance the decorative effect.

[0004] As people's demands for quality of life increase, a high-quality finish on furniture surfaces can enhance product appeal and market competitiveness by improving the user's sensory experience and emotional value. In daily life, fingers typically contain oils, sweat, and skin cells. These substances leave marks when they come into contact with decorative film on furniture, forming visible fingerprints. This not only affects the aesthetics but also increases the frequency of cleaning. Furthermore, existing decorative films, designed to ensure a certain level of fingerprint resistance, suffer from low tear resistance, making them prone to damage.

[0005] Therefore, providing a decorative film material that can simultaneously maintain excellent fingerprint resistance and mechanical properties has extremely high market value. Summary of the Invention

[0006] The purpose of this invention is to provide a method for preparing PP material for GAG decorative films.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for preparing PP material for GAG decorative film, the method comprising the following steps: by weight parts,

[0009] Step 1: Prepare acrylic resin, as follows:

[0010] (1) Weigh the acrylic resin components, which, by weight percentage, are: 3-6% methyl methacrylate, 14-17% styrene, 5-9% butyl acrylate, 11-14% methacrylic acid, 4-8% benzyl methacrylate, 1-2% initiator, and solvent to make up the balance. The solvent is a mixture of butanone and ethyl acetate in a weight ratio of 2-3:1.

[0011] (2) Add 1 / 3 of the weight of butanone to the reaction apparatus, pressurize to 0.15-0.25 MPa, and heat to 93-95℃ under stirring;

[0012] (3) Mix methyl methacrylate, styrene, butyl acrylate, methacrylic acid, benzyl methacrylate, 1 / 3 of the weight of initiator, and 1 / 3 of the weight of butanone evenly to obtain a mixture, and add it to the dropping tank;

[0013] (4) Add the mixture dropwise into the reaction apparatus using a drop pump. After the addition is complete, keep the mixture warm for 2-3 hours. After the warming is complete, add 1 / 2 weight of ethyl acetate and 1 / 3 weight of initiator, and keep the mixture warm for another 1-2 hours. After the warming is complete, add 1 / 2 weight of ethyl acetate and 1 / 3 weight of initiator, and keep the mixture warm for another 1-2 hours. After the warming is complete, add the remaining butanone and stir for 10-15 minutes to obtain the acrylic resin.

[0014] Step 2: Mix PP resin, acrylic resin, mixed resin polymer and modified filler in a weight ratio of 1:(0.3-0.5):(0.1-0.2):(0.06-0.09) evenly, add to a twin-screw extruder, heat to 170-175℃, mix for 2-3 hours, extrude and granulate to obtain mixed resin;

[0015] Step 3: Mix 55-60 parts of mixed resin, 25-30 parts of wood flour and 1-2 parts of polyethylene wax evenly, add to a twin-screw extruder, heat and mix at 147-150℃ for 1-2 hours, and then add to a winding film system machine to form a film, thereby obtaining PP material for GAG decorative film.

[0016] SK's BH3300 PP resin from South Korea is widely used as a decorative film material due to its healthy and environmentally friendly characteristics. However, PP material has unsatisfactory scratch resistance, making furniture surfaces easily scratched, affecting aesthetics and usage costs. This invention improves the scratch resistance of PP material by adding acrylic resin. Analysis shows that the acrylic resin prepared in this invention can form a good interfacial bond with the PP matrix, helping to form a denser and more uniform layer on the PP material surface, reducing scratches caused by internal stress concentration. The inventors also found that adding the acrylic resin improved the weather resistance of PP material. However, they found that even after adding acrylic resin, the fingerprint resistance of PP material remained unsatisfactory.

[0017] Further, the mixed resin polymer is a blend of ternary copolymer polypropylene, low-density polyethylene and ethylene-vinyl acetate copolymer in a weight ratio of 1:(0.2-0.5):(1.4-1.8).

[0018] Furthermore, the low-density polyethylene is LDPE 1C7A, purchased from Yanshan Petrochemical.

[0019] Furthermore, the polypropylene is a ternary copolymer polypropylene C5608, purchased from Yanshan Petrochemical.

[0020] Furthermore, the ethylene-vinyl acetate copolymer is EVA 14J2, purchased from Yanshan Petrochemical.

[0021] This invention improves the fingerprint resistance of PP materials by incorporating a specific proportion of ternary copolymer polypropylene, low-density polyethylene, and ethylene-vinyl acetate copolymer into the system. Analysis shows that the mixture of ternary copolymer polypropylene, low-density polyethylene, and ethylene-vinyl acetate copolymer with PP and acrylic resin can form a smoother surface, reducing the area for fingerprint oil absorption, making fingerprints easier to wipe away or evaporate. Simultaneously, it prevents skin oils from forming persistent marks on the surface, and even if fingerprints are left, they are more easily removed by airborne dust or light wiping.

[0022] Further, the sawdust is crushed and passed through a 100-200 mesh sieve to obtain wood flour.

[0023] Furthermore, the initiator is azobisisobutyronitrile.

[0024] Furthermore, the stirring conditions in step (2) are: 200-220 r / min.

[0025] Furthermore, the dripping is completed in step (4) after 4.5-5 hours.

[0026] Furthermore, the method for preparing the modified filler is as follows:

[0027] (1) Mix montmorillonite, organobentonite and nano silica in a weight ratio of 1:(1.3-1.6):(0.4-0.8), calcine at 560-580℃ for 2-3 hours, cool to room temperature, grind and sieve to obtain porous filler.

[0028] (2) Mix the porous packing material with water at a weight ratio of 1:8-10, add sodium carbonate to make the pH value 9-10, and stir at 50-60℃ for 2-3 hours to form a packing material suspension;

[0029] (3) Mix the filler suspension with hexadecyltrimethylammonium bromide at a weight ratio of 1:0.03-0.05, stir evenly, stir and react at 60-65℃ for 2-3 hours, filter, wash and dry to obtain the modified filler.

[0030] The inventors discovered that, while ensuring the fingerprint resistance of PP resin, the addition of acrylic resin and mixed resin polymers leads to poor wear resistance in PP materials. Analysis suggests this may be due to disruption of the original PP crystalline structure or the formation of phase separation detrimental to wear resistance. This invention attempted to improve the wear resistance of PP materials by adding fillers, but the results were unsatisfactory. This invention improves the wear resistance of PP materials by modifying the filler. Analysis shows that the modified filler has better compatibility with the system components and can achieve nanoscale dispersion in the PP matrix, forming a more uniform composite material. This reduces internal defects, enhances interfacial interactions, and strengthens the adhesion between components, thereby improving wear resistance. Simultaneously, it improves the tensile properties of the PP material.

[0031] Furthermore, the sieving is performed through a 100-200 mesh sieve.

[0032] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0033] 1. PP resin, as a decorative film material, is widely used due to its healthy and environmentally friendly characteristics. However, PP material has unsatisfactory scratch resistance, making furniture surfaces easily scratched, affecting aesthetics and usage costs. This invention improves the scratch resistance of PP material by adding acrylic resin to it. Furthermore, the inventors discovered that adding the acrylic resin prepared according to this invention improves the weather resistance of PP material.

[0034] 2. The inventors discovered that the fingerprint resistance of PP material was still unsatisfactory even after adding acrylic resin. This invention improves the fingerprint resistance of PP material by adding a specific proportion of a mixed resin polymer of ternary copolymer polypropylene, low-density polyethylene, and ethylene-vinyl acetate copolymer to the system.

[0035] 3. The inventors discovered that, while ensuring the fingerprint resistance of PP resin, the addition of acrylic resin and mixed resin polymers can lead to poor wear resistance in PP materials. Analysis suggests this may be due to disruption of the original crystalline structure of PP or the formation of phase separation that is detrimental to wear resistance. This invention improves the wear resistance of PP materials by modifying them with mixed fillers. Simultaneously, it also improves the tensile properties of PP materials. Detailed Implementation

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0037] Some of the raw materials used in the examples were purchased from the following manufacturers:

[0038] PP resin, Korean SK brand BH3300.

[0039] Polyethylene wax, Beijing Zirisheng Science and Trade Co., Ltd., special polyethylene wax for masterbatch.

[0040] Example 1

[0041] This embodiment provides a method for preparing PP material for GAG decorative film, the preparation method comprising the following steps: by weight parts,

[0042] Step 1: Prepare acrylic resin, as follows:

[0043] (1) Weigh the acrylic resin components, which are: 5% methyl methacrylate, 15% styrene, 7% butyl acrylate, 12% methacrylic acid, 6% benzyl methacrylate, 2% initiator, and solvent to make up the balance. The solvent is a mixture of butanone and ethyl acetate in a weight ratio of 3:1; the initiator is azobisisobutyronitrile.

[0044] (2) Add 1 / 3 of the weight of butanone to the reaction apparatus, pressurize to 0.2 MPa, heat to 94°C at 210 r / min and stirring.

[0045] (3) Mix methyl methacrylate, styrene, butyl acrylate, methacrylic acid, benzyl methacrylate, 1 / 3 of the weight of initiator, and 1 / 3 of the weight of butanone evenly to obtain a mixture, and add it to the dropping tank;

[0046] (4) The mixture was added dropwise to the reaction apparatus by a drop pump. The addition was completed in 4.7 hours. After the addition was completed, the mixture was kept at a constant temperature for 2.5 hours. After the temperature was kept at a constant temperature, 1 / 2 weight of ethyl acetate and 1 / 3 weight of initiator were added. The mixture was kept at a constant temperature for another 1.5 hours. After the temperature was kept at a constant temperature, 1 / 2 weight of ethyl acetate and 1 / 3 weight of initiator were added. The mixture was kept at a constant temperature for another 1.5 hours. After the temperature was kept at a constant temperature, the remaining butanone was added and the mixture was stirred for 12 minutes to obtain acrylic resin.

[0047] Step 2: Mix PP resin, acrylic resin, mixed resin polymer and modified filler in a weight ratio of 1:0.4:0.2:0.07 evenly, add to a twin-screw extruder, heat to 172℃, mix for 2.5h, extrude and granulate to obtain mixed resin;

[0048] Step 3: Crush the wood chips and pass them through a 100-mesh sieve to obtain wood powder; mix 57 parts of mixed resin, 28 parts of wood powder and 2 parts of polyethylene wax evenly, add them to a twin-screw extruder, heat and mix at 148°C for 1.5 hours, and then add them to a winding film system machine to form a film, thereby obtaining PP material for GAG decorative film.

[0049] The mixed resin polymer is a blend of ternary copolymer polypropylene, low-density polyethylene and ethylene-vinyl acetate copolymer in a weight ratio of 1:0.4:1.6.

[0050] The low-density polyethylene is LDPE 1C7A, purchased from Yanshan Petrochemical.

[0051] The polypropylene is a ternary copolymer polypropylene C5608, purchased from Yanshan Petrochemical.

[0052] The ethylene-vinyl acetate copolymer was EVA 14J2, purchased from Yanshan Petrochemical.

[0053] The modified filler is prepared by:

[0054] (1) Montmorillonite, organobentonite and nano silica were mixed in a weight ratio of 1:1.5:0.6 and calcined at 580°C for 3 hours. After cooling to room temperature, the mixture was ground and sieved to obtain porous filler.

[0055] (2) Mix the porous packing material and water at a weight ratio of 1:9, add sodium carbonate to make the pH value 9, and stir at 55℃ for 2.5h to form a packing material suspension;

[0056] (3) Mix the filler suspension with hexadecyltrimethylammonium bromide at a weight ratio of 1:0.04, stir evenly, stir at 62°C for 2.6 h, filter, wash and dry to obtain the modified filler.

[0057] Montmorillonite: The content of montmorillonite particles passing through a 200-mesh sieve is ≥97wt%. Zhejiang Huatai New Materials Co., Ltd., Model: DK2 Nano Montmorillonite.

[0058] Organic bentonite: 94 wt% can pass through a 200-mesh sieve. Hemings Deqian Organic Modified Bentonite (BENTONE EW-NA).

[0059] Nano-silica: average particle size 30nm, specific surface area 150-250m² 2 / g. Zhejiang Zhitai Nano-Micro New Materials Co., Ltd.

[0060] Example 2

[0061] This embodiment provides a method for preparing PP material for GAG decorative film, the preparation method comprising the following steps: by weight parts,

[0062] Step 1: Prepare acrylic resin, as follows:

[0063] (1) Weigh the acrylic resin components, which are: 6% methyl methacrylate, 14% styrene, 9% butyl acrylate, 11% methacrylic acid, 8% benzyl methacrylate, 1% initiator, and solvent to make up the balance. The solvent is a mixture of butanone and ethyl acetate in a weight ratio of 2:1; the initiator is azobisisobutyronitrile.

[0064] (2) Add 1 / 3 of the weight of butanone to the reaction apparatus, pressurize to 0.25 MPa, heat to 95°C at 200 r / min with stirring;

[0065] (3) Mix methyl methacrylate, styrene, butyl acrylate, methacrylic acid, benzyl methacrylate, 1 / 3 of the weight of initiator, and 1 / 3 of the weight of butanone evenly to obtain a mixture, and add it to the dropping tank;

[0066] (4) The mixture was added dropwise to the reaction apparatus by a drop pump. The addition was completed in 4.5 hours. After the addition was completed, the mixture was kept at a constant temperature for 3 hours. After the temperature was maintained, 1 / 2 weight of ethyl acetate and 1 / 3 weight of initiator were added. The mixture was kept at a constant temperature for another hour. After the temperature was maintained, 1 / 2 weight of ethyl acetate and 1 / 3 weight of initiator were added. The mixture was kept at a constant temperature for another 2 hours. After the temperature was maintained, the remaining butanone was added and the mixture was stirred for 10 minutes to obtain acrylic resin.

[0067] Step 2: Mix PP resin, acrylic resin, mixed resin polymer and modified filler in a weight ratio of 1:0.3:0.1:0.06 evenly, add to a twin-screw extruder, heat to 175℃, mix for 2 hours, extrude and granulate to obtain mixed resin;

[0068] Step 3: Crush the wood chips and pass them through a 200-mesh sieve to obtain wood powder; mix 55 parts of mixed resin, 30 parts of wood powder and 1 part of polyethylene wax evenly, add them to a twin-screw extruder, heat and mix at 150°C for 1 hour, and then add them to a winding film system machine to form a film, thereby obtaining PP material for GAG decorative film.

[0069] The mixed resin polymer is a blend of ternary copolymer polypropylene, low-density polyethylene and ethylene-vinyl acetate copolymer in a weight ratio of 1:0.5:1.4.

[0070] The low-density polyethylene is LDPE 1C7A, purchased from Yanshan Petrochemical.

[0071] The polypropylene is a ternary copolymer polypropylene C5608, purchased from Yanshan Petrochemical.

[0072] The ethylene-vinyl acetate copolymer was EVA 14J2, purchased from Yanshan Petrochemical.

[0073] The modified filler is prepared by:

[0074] (1) Montmorillonite, organobentonite and nano silica were mixed in a weight ratio of 1:1.6:0.8 and calcined at 560°C for 3 hours. After cooling to room temperature, the mixture was ground and sieved to obtain porous filler.

[0075] (2) Mix the porous packing material and water at a weight ratio of 1:9, add sodium carbonate to make the pH value 9, and stir at 55℃ for 2.4h to form a packing material suspension;

[0076] (3) Mix the filler suspension with hexadecyltrimethylammonium bromide at a weight ratio of 1:0.03, stir evenly, stir at 65°C for 2 hours, filter, wash and dry to obtain the modified filler.

[0077] Montmorillonite: The content of montmorillonite particles passing through a 200-mesh sieve is ≥97wt%. Zhejiang Huatai New Materials Co., Ltd., Model: DK2 Nano Montmorillonite.

[0078] Comparative Example 1

[0079] The difference between this comparative example and Example 1 is that PP resin, acrylic resin and modified filler were mixed evenly in a weight ratio of 1:0.6:0.07.

[0080] Comparative Example 2

[0081] The difference between this comparative example and Example 1 is that PP resin, acrylic resin, mixed resin polymer and modified filler were mixed evenly in a weight ratio of 1:0.2:0.4:0.07.

[0082] Comparative Example 3

[0083] The difference between this comparative example and Example 1 is that PP resin, acrylic resin, mixed resin polymer and modified filler were mixed evenly in a weight ratio of 1:0.6:0.5:0.07.

[0084] Comparative Example 4

[0085] The difference between this comparative example and Example 1 is as follows:

[0086] The mixed resin polymer is a blend of ternary copolymer polypropylene, low-density polyethylene and ethylene-vinyl acetate copolymer in a weight ratio of 1:1:1.

[0087] Comparative Example 5

[0088] The difference between this comparative example and Example 1 is that the modified filler is prepared by: (1) mixing montmorillonite, organobentonite and nano silica in a weight ratio of 1:1.5:0.6 to obtain a mixture; (2) mixing the mixture in a weight ratio of 1:0.03:7, silane coupling agent KH550 and 55wt% ethanol aqueous solution, reacting at 70℃ for 6h, filtering, washing and drying to obtain the modified filler.

[0089] Comparative Example 6

[0090] The difference between this comparative example and Example 1 is as follows:

[0091] Montmorillonite: 97 wt% passing through a 325-mesh sieve. Lingshou County Hongrun Mineral Products Processing Plant.

[0092] Organic bentonite: Particle size ≤ 1μm. Model: Deqian Hemings BENTONE SD-2 Organic Bentonite.

[0093] Nano-silica: average particle size 100nm, specific surface area 60-100m² 2 / g. Zhejiang Zhitai Nano-Micro New Materials Co., Ltd.

[0094] Comparative Example 7

[0095] The difference between this comparative example and Example 1 is that the weight ratio of montmorillonite, organobentonite, and nano-silica is 1:1:1.

[0096] Comparative Example 8

[0097] The difference between this comparative example and Example 1 is that the acrylic resin used is commercially available, brand: BASF, model: Acronol PRO780.

[0098] Performance testing

[0099] The PP materials prepared by the methods of Examples 1-2 and Comparative Examples 1-8, with a thickness of 0.2 mm, were subjected to performance tests.

[0100] 1. Scratch resistance: Tested according to DI N68861 / 4,1981-12 method, requiring 4D grade (>1.0-1.5N);

[0101] 2. Abrasion resistance: Tested according to DIN68861 / 2,1981-12, requiring at least grade 2B (>350-650 r / min);

[0102] 3. Tensile strength: Tested according to DIN EN ISO 527-3 / 2 / 200, 2003-07, requiring longitudinal strength ≥ 40 N / mm² and transverse strength ≥ 30 N / mm². 2 ;

[0103] 4. Weather resistance: Tested according to IEC 61215 method, under conditions of 85℃ × 85% RH, with a requirement of >2000h.

[0104] 5. Anti-fingerprint properties: Wash hands with clean water and dry them with a towel. Keep them in a natural state (without touching any objects) for 10 minutes. Then press the coated particleboard surface firmly, remove your hands, observe and record the time it takes for the fingerprints to disappear. Repeat the same experiment 6 times and calculate the average value.

[0105] The results are shown in Table 1.

[0106] Table 1 Performance Test Results

[0107]

[0108]

[0109] As can be seen from the above performance test results, Examples 1-2 have good scratch resistance, fingerprint resistance, abrasion resistance and tensile properties, especially Example 1 has the most outstanding comprehensive performance. This is mainly because the components have a synergistic effect, which improves the performance of PP material.

[0110] The comparative examples, however, did not employ the necessary technical solutions, resulting in significantly inferior performance compared to the examples. In comparative examples 1-4, the resin ratio was altered, leading to a decrease in scratch resistance and fingerprint resistance. This demonstrates that the type and amount of resin significantly impact scratch resistance and fingerprint resistance. In comparative example 5, the filler modification method was different, which affected abrasion resistance and tensile properties. These experimental results further demonstrate the importance of the technical solutions defined in this invention for its technical effectiveness.

[0111] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing PP material for GAG decorative films, characterized in that, The preparation method is as follows: Step 1: Prepare acrylic resin, as follows: (1) Weigh the acrylic resin components, which, by weight percentage, are: 3-6% methyl methacrylate, 14-17% styrene, 5-9% butyl acrylate, 11-14% methacrylic acid, 4-8% benzyl methacrylate, 1-2% initiator, and solvent to make up the balance. The solvent is a mixture of butanone and ethyl acetate in a weight ratio of 2-3:

1. (2) Add 1 / 3 of the weight of butanone to the reaction apparatus, pressurize to 0.15-0.25 MPa, and heat to 93-95°C under stirring; (3) Mix methyl methacrylate, styrene, butyl acrylate, methacrylic acid, benzyl methacrylate, 1 / 3 of the weight of initiator, and 1 / 3 of the weight of butanone evenly to obtain a mixture, and add it to the dropping tank; (4) Add the mixture to the reaction apparatus dropwise using a drop pump. After the addition is complete, keep the mixture warm for 2-3 hours. After the warming is complete, add 1 / 2 weight of ethyl acetate and 1 / 3 weight of initiator, and keep the mixture warm for another 1-2 hours. After the warming is complete, add 1 / 2 weight of ethyl acetate and 1 / 3 weight of initiator, and keep the mixture warm for another 1-2 hours. After the warming is complete, add the remaining butanone and stir for 10-15 minutes to obtain the acrylic resin. Step 2: Mix PP resin, acrylic resin, mixed resin polymer and modified filler in a weight ratio of 1:(0.3-0.5):(0.1-0.2):(0.06-0.09) evenly, add to a twin-screw extruder, heat to 170-175℃, mix for 2-3 hours, extrude and granulate to obtain mixed resin; Step 3: By weight, mix 55-60 parts of mixed resin, 25-30 parts of wood flour and 1-2 parts of polyethylene wax evenly, add to a twin-screw extruder, heat and mix at 147-150℃ for 1-2 hours, and then add to a film stretching machine to form a film, thereby obtaining PP material for GAG decorative film. The mixed resin polymer is a blend of ternary copolymer polypropylene, low-density polyethylene and ethylene-vinyl acetate copolymer in a weight ratio of 1:(0.2-0.5):(1.4-1.8). The modified filler is prepared by: (1) Mix montmorillonite, organobentonite and nano silica in a weight ratio of 1:(1.3-1.6):(0.4-0.8), calcine at 560-580℃ for 2-3 hours, cool to room temperature, grind and sieve to obtain porous filler; (2) Mix porous packing material with water at a weight ratio of 1:8-10, add sodium carbonate to make the pH value 9-10, and stir at 50-60℃ for 2-3 hours to form a packing material suspension; (3) Mix the filler suspension with hexadecyltrimethylammonium bromide at a weight ratio of 1:0.03-0.05, stir evenly, stir and react at 60-65℃ for 2-3 hours, filter, wash and dry to obtain the modified filler; The sieving process involves passing through a 100-200 mesh sieve. Montmorillonite: The content of montmorillonite with a particle size passing through a 200-mesh sieve is ≥97wt%; Zhejiang Huatai New Materials Co., Ltd., Model: DK2 Nano Montmorillonite; Organic bentonite: 94wt% can pass through a 200-mesh sieve; Hemings Deqian organic modified bentonite BENTONE EW-NA; Nano-silica: average particle size 30nm, specific surface area 150-250m² 2 / g; Zhejiang Zhitai Nano-Micro New Materials Co., Ltd.

2. The method for preparing PP material for GAG decorative film according to claim 1, characterized in that, The low-density polyethylene is LDPE 1C7A.

3. The method for preparing PP material for GAG decorative film according to claim 1, characterized in that, The polypropylene is a ternary copolymer polypropylene C5608.

4. The method for preparing PP material for GAG decorative film according to claim 1, characterized in that, The ethylene-vinyl acetate copolymer is EVA 14J2.

5. The method for preparing PP material for GAG decorative film according to claim 1, characterized in that, The sawdust is crushed and passed through a 100-200 mesh sieve to obtain wood flour.

6. The method for preparing PP material for GAG decorative film according to claim 1, characterized in that, The initiator is azobisisobutyronitrile.

7. The method for preparing PP material for GAG decorative film according to claim 1, characterized in that, The dripping process in step (4) is completed in 4.5-5 hours.

8. A PP material for GAG decorative film prepared by the preparation method according to any one of claims 1-7.

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