Laminating and embossing production process of multi-layer composite PVC decorative film

Abstract

The invention relates to the technical field of molding processing of plastics, in particular to a laminating and embossing production process of a multi-layer composite PVC decorative film. The preparation method comprises the following steps: firstly, preparing various raw materials such as PVC resin powder containing innovative components such as an anti-aging agent; the raw materials are subjected to mixing, twin-screw extrusion and stretching to prepare the PVC base layer film; the decorative layer is pretreated according to different materials and then glued and attached to the base layer film, and ultrasonic vibration is applied during attaching; an embossing roller is provided with a micro heating device and is irradiated by ultraviolet rays; and finally, cooling and shaping, eliminating static electricity, and rolling and packaging after detection. Each step has specific parameters. The production process has obvious advantages; the flexibility, the heat stability and the ageing resistance of the decorative film are improved through raw material innovation; the embossing effect is vivid, and wear resistance and corrosion resistance are achieved; the environment-friendly standard is met, the product competitiveness can be improved, and the requirement of the market for the high-quality decorative film is met.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic forming and processing, and specifically to a lamination and embossing production process for a multi-layer composite PVC decorative film. Background Art

[0002] As an important decorative material, PVC decorative film is widely used. It can endow products with rich and diverse appearance effects, such as imitating wood grain, stone grain, etc., and at the same time has certain physical properties and chemical stability. However, there are many problems in the existing lamination and embossing production process of PVC decorative film, which are difficult to meet the continuously upgraded market demands. The formula of traditional PVC decorative film is relatively single. The commonly used plasticizers have problems such as large volatility and poor durability while providing flexibility. Over time and with changes in the use environment, the volatilization of plasticizers will cause the decorative film to become hard and brittle, affecting its service life. The traditional stabilizer system has limited thermal stability effect on PVC. During processing and use, PVC is prone to thermal decomposition, generating hydrogen chloride gas, which will not only corrode equipment, but also cause the decorative film to change color and its performance to decline. Moreover, traditional decorative films lack effective anti-aging means and are prone to yellowing, powdering, etc. under sunlight irradiation, greatly reducing the decorative effect.

[0003] Most traditional methods rely on simple adhesive coating and mechanical pressing. This method is difficult to ensure a firm and uniform bond between the decorative layer and the PVC base film. During long-term use, when affected by temperature, humidity changes and external forces, the decorative layer is prone to problems such as peeling and blistering. For example, in some humid environments, the edges of the decorative film often curl up, seriously affecting the beauty and use performance of the product. Moreover, the traditional lamination process lacks targeted pretreatment means for different materials of the decorative layer and cannot give full play to the advantages of various materials, further restricting the improvement of product quality.

[0004] Traditional embossing equipment and technology are difficult to precisely control the depth, texture clarity and uniformity of embossing. The embossing effect of the produced decorative film is uneven and cannot accurately simulate the texture of natural materials. Moreover, during the embossing process, due to uneven friction and pressure distribution between the material and the embossing roller, defects are prone to occur in the embossed part, such as texture fracture and deformation. This not only reduces the product qualification rate, but also increases the production cost.

[0005] The existing production processes also face challenges in terms of environmental protection. Some adhesives and additives contain harmful substances, which will volatilize harmful gases during production and use, posing hazards to the health of operators and the environment. With the increasingly strict environmental protection standards, the limitations of traditional processes have become more prominent. As consumers' requirements for the aesthetics, durability, and environmental friendliness of decorative materials continue to increase, and with the increasingly fierce market competition, it is urgent to develop an innovative production process for laminating and embossing multi-layer composite PVC decorative films. This process needs to solve the problems of traditional processes in terms of raw materials, lamination, embossing, and environmental protection, in order to produce high-quality, high-performance, and environmentally friendly PVC decorative film products to meet the diverse needs of the market for decorative materials. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a production process for laminating and embossing multi-layer composite PVC decorative films.

[0007] A production process for laminating and embossing multi-layer composite PVC decorative films includes the following steps: S1: Raw material preparation; prepare PVC resin powder, plasticizer, stabilizer, lubricant, anti-aging agent, nano-enhancing filler, embossing aid, binder, and photoinitiator; the anti-aging agent is a graft copolymer of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl) benzotriazole and glycidyl methacrylate, and the structure of the 2-(2'-hydroxy-3',5'-di-tert-butylphenyl) benzotriazole is: , The polymerization degree of the PVC resin powder is 1000 - 1300, and the dosage is 100 parts; the plasticizer consists of diisononyl phthalate, epoxy fatty acid methyl ester, and internal plasticizer polypropylene glycol adipate, with a mass ratio of 3:2:1, and the dosage is 40 - 60 parts; the stabilizer is compounded with organotin, calcium-zinc composite stabilizer, and heat stability promoter bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, and the structure of the bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite is: , 1 - 3 parts of organotin, 2 - 4 parts of calcium-zinc composite, 0.5 - 1 part of heat stability promoter; the lubricant is a mixture of calcium stearate, polyethylene wax, and nano-modified lubricant nano-silica grafted zinc stearate in a ratio of 1:1:0.5, with a dosage of 1 - 3 parts; 3 - 6 parts of anti-aging agent; the nano-enhancing filler is nano-titanium dioxide surface-treated with a synergistic treatment of silane coupling agent and rare earth element cerium, with a particle size of 20 - 50 nm and a dosage of 5 - 10 parts; the embossing aid is a fluorinated organosilicon polymer polydimethylsiloxane-methyl methacrylate fluoride copolymer, with a dosage of 1 - 3 parts; the binder is a polyurethane adhesive containing reactive groups, adding photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone, and the dosage is determined according to the lamination area; S2: Preparation of PVC base film; Add raw materials into a high-speed mixer, first premix at 60 - 80°C and 200 - 300 r / min for 5 - 10 minutes, then raise the temperature to 100 - 120°C and 400 - 600 r / min and mix for 15 - 25 minutes; After mixing evenly, put it into a twin-screw extruder, and its screw is equipped with mixing elements; The temperature of the first zone of the twin-screw extruder is 150 - 160°C, the second zone is 160 - 170°C, the third zone is 170 - 180°C, the fourth zone is 180 - 190°C, the head temperature is 190 - 200°C, the screw speed is 30 - 50 r / min, and perform in-line stretching after extrusion, with a stretching ratio of 1.2 - 1.5, to obtain the PVC base film; S3: Pretreatment of the decorative layer; If the decorative layer is a PET film with a printed pattern, first perform corona treatment with a power of 3 - 5 kW and a time of 1 - 3 minutes, then perform plasma treatment with a power of 1 - 2 kW and a time of 30 - 60 seconds, and then perform ultraviolet pre-curing treatment with an energy density of 50 - 100 mJ / cm²; If it is natural wood veneer, dry it to a moisture content of 8% - 12%, and after sanding, impregnate it with a coupling agent solution for 5 - 10 minutes; S4: Lamination; Coat the adhesive on the surface of the PVC base film with a microgravure coater, with a coating amount of 5 - 10 g / m², which is precisely controlled by controlling the microgravure screen line number and the doctor blade pressure; Laminate the pretreated decorative layer with the coated base film, apply ultrasonic vibration during lamination, with a frequency of 20 - 30 kHz, a lamination pressure of 0.5 - 1.5 MPa, a temperature of 50 - 70°C, and a time of 5 - 10 minutes; S5: Embossing; Feed the laminated material into an embossing machine, the surface of the embossing roller has a preset texture and a micro-heating device is installed inside; The embossing temperature is 120 - 150°C, the pressure is 1 - 3 MPa, and the time is 10 - 20; S6: Cooling and shaping; Cool the embossed material through a cooling roller, and there is a spiral cooling channel inside the cooling roller, through which circulating cooling water is passed, and the cooling temperature is 20 - 30°C; During cooling, perform static elimination treatment on the surface of the material to prevent dust adsorption; S7: Post-treatment; Perform quality inspection on the cooled and shaped decorative film, including appearance, bonding strength, aging resistance performance, and embossing depth inspection; The qualified products are wound and packaged, and the packaging material contains an ultraviolet shielding agent; Preferably, it also includes that in the S1 raw material preparation step, when performing surface treatment on the nano-enhanced filler, first ultrasonically disperse nano-titanium dioxide in a silane coupling agent solution for 30 - 60 minutes, and then add a cerium salt solution and stir and react for 2 - 3 hours.

[0008] Preferably, it also includes that after the S2 PVC base film preparation step, perform plasma treatment on the PVC base film with a power of 0.5 - 1 kW and a time of 1 - 2 minutes to further improve the surface activity.

[0009] Preferably, in step S1, the degree of polymerization of the PVC resin powder is 1100 - 1200.

[0010] Preferably, in step S1, the dosage of the plasticizer is 45 - 55 parts.

[0011] Preferably, in step S2, when the high - speed mixer is heating and mixing, nitrogen is introduced every 5 minutes to displace the internal air, and each displacement time is 1 - 2 minutes.

[0012] Preferably, in step S3, if the decorative layer is natural wood veneer, the grit size of the sandpaper during grinding is 200 - 300 mesh.

[0013] Preferably, in step S4, the amplitude of the ultrasonic vibration is 5 - 10 μm.

[0014] Preferably, in step S5, the wavelength of the ultraviolet irradiation is 365 nm, and the irradiation intensity is 5 - 10 mW / cm².

[0015] Preferably, in step S7, the tension during winding is controlled at 10 - 20 N to ensure the winding quality.

[0016] Compared with the existing technology, the beneficial effects of the present invention are as follows: 1. The use of plasticizers, stabilizers and anti - aging agents has greatly improved the performance of the decorative film. The internal plasticizer and traditional plasticizers act synergistically, enhancing the flexibility and durability of the decorative film, reducing the volatilization loss of plasticizers, and extending the service life of the product. The heat - stability promoter cooperates with organic tin and calcium - zinc composite stabilizers, effectively inhibiting the thermal decomposition of PVC during processing and use, improving the thermal stability of the product, and reducing the risk of equipment corrosion. The anti - aging agent can efficiently absorb ultraviolet rays and inhibit thermal - oxidative degradation, making the decorative film not easily turn yellow or powder under long - term light irradiation, and maintaining good appearance and performance.

[0017] 2. The improvement of the lamination process has greatly enhanced the bonding performance of the decorative film. The application of ultrasonic vibration during lamination promotes the uniform distribution and penetration of the adhesive, enhancing the bonding force between the decorative layer and the PVC base film. At the same time, the pretreatment methods for different decorative layers give full play to the material characteristics, ensuring a firm and stable lamination effect. After testing, for the decorative film produced by this process, the peel strength between the decorative layer and the base layer is 30% - 50% higher than that of the traditional process, effectively avoiding problems such as the peeling off and blistering of the decorative layer.

[0018] 3. The optimization of the embossing process has brought excellent appearance effects and product quality. The use of a micro-heating device inside the embossing roller and a photoinitiator enables precise control of the embossing process, achieving higher levels of embossing depth, texture clarity, and uniformity. The migration of the embossing aid to the surface not only improves the embossing effect but also enhances the abrasion resistance and corrosion resistance of the embossed area. The produced decorative film can highly realistically simulate the texture and feel of natural materials, enhancing the aesthetics and added value of the product.

[0019] 4. The environmentally friendly adhesives and additives used in this process reduce the volatilization of harmful gases, meeting the requirements of environmental protection standards. The electrostatic elimination treatment during the production process and the optimized design of the cooling roller improve production efficiency and reduce energy consumption. Overall, the PVC decorative film produced by the process of the present invention has obvious advantages in terms of performance, quality, and environmental protection, can meet the market demand for high-quality decorative materials, and enhance the competitiveness of the product in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a flowchart of the laminating and embossing production process for a multi-layer composite PVC decorative film; Figure 2 is a bar chart comparing the bond strength and aging resistance performance between the examples and the comparative examples; Figure 3 is a line chart comparing the hardness and abrasion resistance between the examples and the comparative examples; Figure 4 is a bar-line chart comparing the tensile strength and elongation at break between the examples and the comparative examples. DETAILED DESCRIPTION OF THE INVENTION

[0021] According to Figures 1 to 4 , the detailed implementation manners of the present invention are as follows: Example 1 Raw Material Preparation Select 100 parts of PVC resin powder with a polymerization degree of 1100. For plasticizers, diisononyl phthalate (DINP), epoxidized fatty acid methyl ester (EFM), and internal plasticizer (polypropylene adipate) are mixed in a mass ratio of 3:2:1, and a total of 50 parts are taken. The stabilizer is compounded with 2 parts of organotin stabilizer, 3 parts of calcium-zinc composite stabilizer, and 0.8 part of heat stability promoter (bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite). The lubricant is a mixture of calcium stearate, polyethylene wax, and nano-modified lubricant (nano-silica grafted zinc stearate) in a ratio of 1:1:0.5, and 2 parts are taken. 4 parts of anti-aging agent, 7 parts of nano-enhanced filler (nano-titanium dioxide with a particle size of 30 nm, the surface of which is synergistically treated with silane coupling agent and cerium), and 2 parts of embossing aid (fluorinated organosilicon polymer). The binder is a polyurethane adhesive containing active groups, and an appropriate amount of photoinitiator (2-hydroxy-2-methyl-1-phenyl-1-propanone) is added.

[0022] Preparation steps Preparation of PVC base film Add the above raw materials to a high-speed mixer. First, premix at 70°C and 250 r / min for 8 minutes, then raise the temperature to 110°C and mix at 500 r / min for 20 minutes. After mixing evenly, put it into a twin-screw extruder with mixing elements. The temperature of the first zone of the extruder is 155°C, the second zone is 165°C, the third zone is 175°C, the fourth zone is 185°C, the head temperature is 195°C, and the screw speed is 40 r / min. After extrusion, perform on-line stretching with a stretching ratio of 1.3 to obtain the PVC base film.

[0023] Pretreatment of the decorative layer The decorative layer uses a PET film with a printed pattern. First, perform corona treatment on it with a corona power of 4 kW and a treatment time of 2 minutes; then perform plasma treatment with a power of 1.5 kW and a time of 45 seconds; finally, perform ultraviolet pre-curing treatment with an energy density of 70 mJ / cm².

[0024] Lamination Use a gravure coater to coat the adhesive on the surface of the PVC base film. By controlling the gravure screen line number and the doctor blade pressure, the coating amount reaches 7 g / m². Bond the pretreated PET film to the coated PVC base film. Apply ultrasonic vibration during lamination, with a frequency of 25 kHz, a lamination pressure of 1 MPa, a temperature of 60°C, and a time of 7 minutes.

[0025] Embossing Feed the laminated material into an embossing machine with a micro-heating device. The embossing roller is preset with a wood grain texture, and the texture depth is 0.2 mm. The embossing temperature is 130°C, the pressure is 2 MPa, and the time is 15 seconds. During the embossing process, turn on ultraviolet irradiation with a wavelength of 365 nm and an intensity of 8 mW / cm² to initiate secondary curing of the adhesive.

[0026] Cooling and shaping Cool the embossed material through a cooling roller with spiral cooling channels inside. The cooling roller is fed with circulating cooling water, and the cooling temperature is controlled at 25°C. During cooling, use an electrostatic elimination device to perform electrostatic elimination treatment on the surface of the material.

[0027] Post-treatment Conduct quality inspection on the cooled and shaped decorative film, including appearance inspection, T-peel test to detect the bonding strength (the required peel strength ≥ 5 N / cm), artificial accelerated aging test to detect the aging resistance (after 1000 hours, the color difference ΔE ≤ 3), and embossing depth detection. Qualified products are wound up with a tension of 15 N and packaged with packaging materials containing ultraviolet shielding agents.

[0028] Example 2 Raw material preparation The PVC resin powder selected has a polymerization degree of 1200, and the dosage is 100 parts. The total amount of plasticizer is 55 parts, and the proportion remains unchanged. Among the stabilizers, there are 2.5 parts of organotin, 3.5 parts of calcium-zinc composite, and 0.9 part of heat stability promoter. There are 2.5 parts of lubricant, 5 parts of anti-aging agent, 8 parts of nano-enhanced filler (particle size 40nm), 2.5 parts of embossing aid, and appropriate amounts of binder and photoinitiator.

[0029] Preparation steps Preparation of PVC base film The pre-mixing temperature of the high-speed mixer is 75°C, the rotation speed is 280 r / min, and the time is 9 minutes; the temperature for heating and mixing is 115°C, the rotation speed is 550 r / min, and the time is 22 minutes. The temperature of each zone of the twin-screw extruder is increased by 5°C correspondingly, the screw rotation speed is 45 r / min, and the draw ratio is 1.4.

[0030] Pretreatment of the decorative layer It is also a PET film printed with patterns. The corona power is 4.5 kW and the time is 2.5 minutes; the plasma power is 1.8 kW and the time is 50 seconds; the ultraviolet pre-curing energy density is 80 mJ / cm².

[0031] Lamination The coating amount of the binder is 8 g / m², the ultrasonic vibration frequency is 28 kHz, the lamination pressure is 1.2 MPa, the temperature is 65°C, and the time is 8 minutes.

[0032] Embossing The embossing roller imitates the stone pattern texture, the depth is 0.3 mm, the embossing temperature is 140°C, the pressure is 2.5 MPa, the time is 18 seconds, and the ultraviolet wavelength and intensity remain unchanged.

[0033] Cooling and shaping The cooling temperature is 27°C, and the remaining cooling and electrostatic elimination operations are the same as those in Example 1.

[0034] Post-treatment The quality inspection standard remains unchanged, and the winding tension is 18 N.

[0035] Example 3 Raw material preparation The PVC resin powder has a polymerization degree of 1050, and the dosage is 100 parts. There are 45 parts of plasticizer. Among the stabilizers, there are 1.5 parts of organotin, 2.5 parts of calcium-zinc composite, and 0.7 part of heat stability promoter. There are 1.5 parts of lubricant, 3.5 parts of anti-aging agent, 6 parts of nano-enhanced filler (particle size 25nm), 1.5 parts of embossing aid, and appropriate amounts of binder and photoinitiator.

[0036] Preparation steps Preparation of PVC base film The premixing temperature is 65°C, the rotation speed is 220 r / min, and the time is 7 minutes; the temperature for heating and mixing is 105°C, the rotation speed is 450 r / min, and the time is 18 minutes. The temperature of each zone of the twin-screw extruder is reduced by 5°C, the screw rotation speed is 35 r / min, and the draw ratio is 1.2.

[0037] Pretreatment of the decorative layer The corona power of the PET film is 3.5 kW, and the time is 1.5 minutes; the plasma power is 1.2 kW, and the time is 35 seconds; the energy density of ultraviolet pre-curing is 60 mJ / cm².

[0038] Lamination The coating amount of the binder is 6 g / m², the ultrasonic vibration frequency is 22 kHz, the lamination pressure is 0.8 MPa, the temperature is 55°C, and the time is 6 minutes.

[0039] Embossing The embossing roller imitates the wood grain texture, with a depth of 0.15 mm, an embossing temperature of 125°C, a pressure of 1.5 MPa, a time of 12 seconds, and the ultraviolet wavelength and intensity remain unchanged.

[0040] Cooling and shaping The cooling temperature is 23°C, and the cooling and static elimination operations are the same as in Example 1.

[0041] Post-treatment The quality inspection standard remains unchanged, and the winding tension is 12 N.

[0042] Comparative example Raw material preparation 100 parts of PVC resin powder with a polymerization degree of 800 are selected. Only 40 parts of dioctyl phthalate (DOP) are used as the plasticizer, 3 parts of ordinary calcium-zinc stabilizer are used as the stabilizer, 1 part of calcium stearate is used as the lubricant, and no anti-aging agent, nano-enhanced filler, heat stability promoter, and nano-modified lubricant are added. The binder uses ordinary polyurethane adhesive without special additives.

[0043] Preparation steps Preparation of the PVC base film The raw materials are added to an ordinary mixer and mixed at 90°C for 15 minutes. Then they are fed into an ordinary twin-screw extruder. The temperature of zone 1 is 140°C, zone 2 is 150°C, zone 3 is 160°C, zone 4 is 170°C, and the head temperature is 180°C. The screw rotation speed is 25 r / min, and no in-line stretching is performed.

[0044] Pretreatment of the decorative layer The decorative layer is a PET film with a printed pattern, and only simple corona treatment is carried out, with a power of 3 kW and a time of 1 minute.

[0045] Lamination The binder is coated using a common coating equipment with a coating amount of 4 g / m². The PET film is laminated with the PVC base film under a lamination pressure of 0.4 MPa, at a temperature of 40 °C for 4 minutes without ultrasonic vibration.

[0046] Embossing It is fed into a common embossing machine. The embossing roller has a wood grain texture, a depth of 0.1 mm, an embossing temperature of 100 °C, a pressure of 1 MPa, and a time of 8 seconds.

[0047] Cooling and shaping It is cooled by a common cooling roller at a cooling temperature of 30 °C without electrostatic elimination treatment.

[0048] Post-treatment Only a simple appearance inspection is carried out, and the qualified products are directly wound and packaged.

[0049] After comparison, the multi-layer composite PVC decorative film produced in the examples is significantly superior to the comparative example in terms of bond strength, aging resistance, embossing effect, etc., fully verifying the superiority of the production process of the present invention.

[0050] Performance testing After the examples 1-3 are soaked in 5% hydrochloric acid solution for 24 hours, there is no obvious change on the surface, and the mass loss rates are 0.8%, 0.7% and 0.9% respectively, while obvious swelling phenomenon appears in the comparative example, and the mass loss rate reaches 2.3%. In the immersion test in 10% sodium hydroxide solution, the samples in the examples maintain a complete structure, and the glossiness decreases by no more than 15%, while the surface of the comparative example shows whitening phenomenon and the glossiness decreases by 35%. For the oil resistance test, the ASTM D471 standard is adopted. After the examples are soaked in engine oil at 23 °C for 72 hours, the tensile strength retention rates all exceed 90%, while the comparative example only retains 65%. In terms of weather resistance, after 1000 hours of QUV accelerated aging test, the color difference ΔE of the examples ≤ 2.5 and there are no cracks on the surface, while ΔE of the comparative example reaches 4.8 and micro-cracks appear. These data fully prove that the decorative film produced by the process of the present invention has excellent acid and alkali resistance, oil resistance and weather resistance, and is significantly superior to the products of the traditional process. The comparison of the raw material formulas and performances between the examples and the comparative example is as follows in the table: Table 1 , Conclusion: This table details the comparison of the raw material formulas and key performance data between the examples and the comparative example. From the perspective of raw materials, the examples adopt a variety of additives and the formulas are more complex, while the comparative example is relatively simple. In terms of performance, the examples are significantly superior to the comparative example in bond strength, aging resistance and embossing clarity, intuitively reflecting the advantages of the raw material formula and process of the present invention.

[0051] The comparison of the physical properties between the products of the examples and the comparative example is as follows in the table: Table 2 , Conclusion: This table shows the differences in the physical properties of the products of the examples and the comparative examples. The tensile strength, elongation at break, and hardness of the examples are all higher than those of the comparative examples, while the wear amount is lower than that of the comparative examples, indicating that the products of the examples are superior in mechanical properties and wear resistance, and further demonstrating the improvement effect of the process of the present invention on the product quality.

[0052] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A laminating and embossing production process for a multi-layer composite PVC decorative film, characterized in that, It includes the following steps: S1: Raw material preparation; Prepare PVC resin powder, plasticizer, stabilizer, lubricant, anti-aging agent, nano-enhanced filler, embossing aid, binder and photoinitiator; The anti-aging agent is a graft copolymer of 2-(2'-hydroxy-3',5'-di-tert-butylphenyl) benzotriazole and glycidyl methacrylate, and the structure of the 2-(2'-hydroxy-3',5'-di-tert-butylphenyl) benzotriazole is: ， The stabilizer is compounded with organotin, calcium-zinc composite stabilizer and heat stability promoter bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, and the structure of the bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is: ， The nano-enhanced filler is nano-titanium dioxide synergistically treated on the surface with silane coupling agent and rare earth element cerium; The binder is a polyurethane adhesive containing active groups, and photoinitiator 2-hydroxy-2-methyl-1-phenyl-1-propanone is added; S2: Preparation of PVC base film; Add the raw materials to a high-speed mixer for premixing; After mixing evenly, put them into a twin-screw extruder; After extrusion, carry out in-line stretching; S3: Pretreatment of the decorative layer; If the decorative layer is a PET film with a printed pattern, first carry out corona treatment, then plasma treatment, and then carry out ultraviolet pre-curing treatment; If it is natural wood veneer, dry it to a moisture content of 8%-12%, and after sanding, impregnate it with a coupling agent solution; S4: Lamination; Coat the binder on the surface of the PVC base film with a gravure coater; Bond the pretreated decorative layer to the coated base film, and apply ultrasonic vibration during lamination; S5: Embossing; Feed the laminated material into an embossing machine, and the surface of the embossing roller has a preset texture and a micro-heating device is installed inside; S6: Cooling and shaping; Cool the embossed material through a cooling roller, and the cooling temperature is 20-30°C; At the same time, carry out static elimination treatment on the surface of the material; S7: Post-treatment; Inspect the quality of the cooled and shaped decorative film; The qualified products are wound and packaged, and the packaging material contains an ultraviolet shielding agent.

2. The laminating and embossing production process of a multi-layer composite PVC decorative film according to claim 1, characterized in that, It also includes that in the S1 raw material preparation step, when performing surface treatment on the nano-enhanced filler, first ultrasonically disperse the nano-titanium dioxide in the silane coupling agent solution for 30-60 minutes, and then add the cerium salt solution and stir for reaction for 2-3 hours.

3. The laminating and embossing production process of a multi-layer composite PVC decorative film according to claim 1, characterized in that, It also includes that after the S2 PVC base film preparation step, perform plasma treatment on the PVC base film, with a power of 0.5-1 kW and a time of 1-2 minutes.

4. The laminating and embossing production process of a multi-layer composite PVC decorative film according to claim 1, characterized in that, In the S1 step, the degree of polymerization of the PVC resin powder is 1100-1200.

5. The laminating and embossing production process of a multi-layer composite PVC decorative film according to claim 1, characterized in that, In the S1 step, the plasticizer is composed of diisononyl phthalate, epoxy fatty acid methyl ester and internal plasticizer polypropylene glycol adipate; The lubricant is a mixture of calcium stearate, polyethylene wax and nano-modified lubricant nano-silica grafted zinc stearate; The embossing aid is a fluorinated organosilicon polymer polydimethylsiloxane-methyl methacrylate fluoride copolymer.

6. The laminating and embossing production process of a multi-layer composite PVC decorative film according to claim 1, characterized in that, In the S2 step, when the high-speed mixer is heating and mixing, introduce nitrogen to displace the internal air every 5 minutes, and each displacement time is 1-2 minutes.

7. The laminating and embossing production process of a multi-layer composite PVC decorative film according to claim 1, characterized in that, In the S3 step, if the decorative layer is natural wood veneer, the sandpaper grit number during sanding is 200-300 mesh.

8. The laminating and embossing production process of a multi-layer composite PVC decorative film according to claim 1, characterized in that, In the S4 step, the amplitude of the ultrasonic vibration is 5-10 μm.

9. The laminating and embossing production process of a multi-layer composite PVC decorative film according to claim 1, characterized in that, In step S5, the wavelength of the ultraviolet irradiation is 365 nm, and the irradiation intensity is 5 - 10 mW / cm².

10. The laminating and embossing production process of a multi-layer composite PVC decorative film according to claim 1, characterized in that, In step S7, the tension during winding is controlled at 10 - 20 N.

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