Polyester film, preparation method and polyester film veneer furniture board

Abstract

The invention discloses a polyester film, a preparation method and a polyester film veneer furniture board. The polyester film comprises a hot-melt back adhesive layer and a polyester layer which are attached to each other, the polyester layer is prepared from the following raw materials in percentage by mass: 60 to 80 percent of poly (1, 4-cyclohexanedimethanol terephthalate), 15 to 25 percent of polyphenylene sulfide, 2 to 5 percent of maleic anhydride-styrene-glycidyl methacrylate copolymer, 1 to 3 percent of filler and 0.1 to 2 percent of additive. By adopting the polyester film with the PCT and PPS composite resin as the core, the problem that the deep embossing effect cannot be achieved on the surface of a current home building material film facing material is effectively solved.

Description

Technical Field

[0001] This application relates to the field of building materials, and in particular to a polyester film, a preparation method thereof, and a polyester film-faced furniture panel. Background Technology

[0002] Polyethylene terephthalate (PET) veneer materials, with their excellent environmental friendliness, odorless and non-toxic properties, and superior surface finish, have become a core veneer material for high-end luxury home furnishings, widely used in cabinetry, furniture, and architectural decoration. Their surface can be treated with high gloss or a skin-like finish to achieve a delicate texture, satisfying the dual visual and tactile requirements of modern minimalism. However, current mainstream PET eco-board production technology has significant limitations: decorative effects are concentrated on planar processing, such as simple high gloss, matte, or printed wood grain effects, making it difficult to achieve three-dimensional deep embossing, relief, or complex microstructure textures. This technical bottleneck mainly stems from the inherent thermal performance defects of PET material; its heat distortion temperature is only about 73-85℃, making it prone to softening and deformation within the temperature range required for conventional hot pressing processes (usually >160℃), leading to blurred embossing or damage to the substrate layer. Therefore, PET decorative panels on the market are usually made by combining impregnated decorative paper with a substrate. They have long been limited to flat effects and it is difficult to achieve high-value-added deep embossing designs such as three-dimensional stitching of imitation leather, embossed wood grain or geometric carvings. This has seriously restricted product differentiation innovation and the expansion of high-end application scenarios. Summary of the Invention

[0003] To address the problem that current home building materials and decorative materials cannot achieve deep embossing effects, this application provides a polyester film, a preparation method, and a polyester film-finished furniture board.

[0004] In a first aspect, this application provides a polyester film comprising a hot-melt adhesive layer and a polyester layer bonded together; the raw materials of the polyester layer, by weight percentage, include: 60-80% poly(1,4-cyclohexanediol) terephthalate, 15-25% polyphenylene sulfide, 2-5% maleic anhydride-styrene-glycidyl methacrylate copolymer, 1-3% filler, and 0.1-2% additives.

[0005] In any of the above technical solutions, the maleic anhydride-styrene-glycidyl methacrylate copolymer is obtained by free radical copolymerization of monomers comprising the following mass percentages: 20-30% maleic anhydride, 30-40% styrene, and the balance being glycidyl methacrylate.

[0006] This application overcomes the technical bottleneck of traditional PET materials' inability to achieve deep embossing due to their low heat distortion temperature by utilizing poly(1,4-cyclohexanediol) terephthalate (PCT). Adding highly heat-resistant polyphenylene sulfide (PPS) improves the molding quality of deep embossing and reduces product defect rates without compromising its heat distortion temperature. The composite resin system has a heat distortion temperature ≥215℃, ensuring the application of deep embossing hot pressing processes. PCT provides excellent melt flowability and flexibility, fully filling complex textures (such as deep grooves and sharp angles) in the mold during hot pressing, providing a foundation for three-dimensional pattern formation. PPS, through its high melt strength, enhances the rigidity of the skeleton, resisting deformation after hot pressing and ensuring clear, precise embossed contours that are not easily collapsed or deformed after cooling.

[0007] It is worth noting that PPS has a slow crystallization rate, and excessive use can easily lead to surface depressions during the cooling stage due to uneven shrinkage. PCT, on the other hand, has a fast crystallization rate, and its dominant rapid crystallization behavior can significantly reduce shrinkage stress and suppress warping and collapse of the embossed edges. Furthermore, maleic anhydride-styrene-glycidyl methacrylate copolymer, as a compatibilizer, not only enhances the interfacial compatibility between the two phases but also forms a network structure with the matrix through the interaction of its dual active groups, suppressing elastic shrinkage of the embossed lines after hot pressing and reducing processing defects such as deformation.

[0008] The deep embossing described in this application is a three-dimensional pattern that differs from planar patterns. It is generally formed on a polyester film by hot pressing with a mold (a steel plate with a pattern). There are no special restrictions on the depth of the pattern; it can be adjusted according to actual needs.

[0009] In any of the above technical solutions, the raw material of the polyester layer includes 2-4% carboxyl-terminated liquid polybutadiene.

[0010] In deep embossing, texture corners and edges are prone to brittle fracture due to stress concentration, especially after the addition of polyphenylene sulfide resin, which significantly increases brittleness. The carboxyl-terminated liquid polybutadiene introduced in this application can serve as an elastic dispersed phase to enhance the toughness of the composite material. It can effectively prevent the propagation of microcracks in high-stress areas (such as the sharp corners of deep textures) during hot pressing, avoid edge chipping or surface cracking caused by poor processing, and ensure the integrity of complex textures.

[0011] In any of the above technical solutions, the poly(1,4-cyclohexanediethanol) terephthalate is selected from Eastman's PCTG LX100 or SK Chemicals' PCTG JN200.

[0012] In any of the above technical solutions, the polyphenylene sulfide is selected from Polyplastics PPS-hGR50 or Ticona FX55T1.

[0013] In any of the above technical solutions, the hot melt adhesive layer is a reactive polyurethane hot melt adhesive layer.

[0014] In any of the above technical solutions, the reactive polyurethane hot melt adhesive is a blocked isocyanate polyurethane adhesive.

[0015] In any of the above technical solutions, the additives are commonly used additives in the art, including but not limited to any one or more of lubricants, release agents, antioxidants, ultraviolet absorbers, and flame retardants, which can be added according to actual usage requirements.

[0016] In any of the above technical solutions, the amount of lubricant used is 0.3-1%, preferably silicone powder.

[0017] In any of the above technical solutions, the filler surface is grafted with a chelating titanate coupling agent.

[0018] In any of the above technical solutions, the filler is selected from any one or more of calcium carbonate, talc, kaolin, mica powder, wollastonite, aluminum hydroxide, magnesium hydroxide, barium sulfate, silicon dioxide, carbon nanotubes, montmorillonite, graphene, quartz powder, zeolite powder, titanium dioxide, zinc oxide, iron oxide, aluminum oxide, magnesium oxide, boron nitride, silicon carbide, aluminosilicate, diatomaceous earth, bentonite, and sepiolite.

[0019] In any of the above technical solutions, the surface grafting is prepared by co-modifying a filler with a chelated titanate coupling agent in a solvent at a mass ratio of 100:3 to 6.

[0020] In any of the above technical solutions, the surface of the polyester layer away from the hot melt adhesive layer has a microporous structure, and the surface of the polyester layer with the microporous structure is coated with an anti-fouling layer with a thickness of 0.5 to 1.0 μm; by mass percentage, the raw materials of the anti-fouling layer include 5 to 15% modified nano-silica and the balance being hydrophobic modified resin.

[0021] In any of the above technical solutions, the modified nano-silica is obtained by amidation reaction of epoxidized nano-silica with aminoimidazole.

[0022] In any of the above technical solutions, the raw materials for the modified nano silica include nano silica, epoxy siloxane compound and aminoimidazole in a mass ratio of 100:5~10:8~12.

[0023] In any of the above technical solutions, the epoxy siloxane compound is selected from one or more of γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, and 3-glycidoxypropyltriisopropoxysilane.

[0024] In any of the above technical solutions, the particle size of the nano-silica is 5-50 nm.

[0025] The antifouling layer is based on modified nano-silica and hydrophobic acrylic resin, which improves the durability of antifouling capabilities. Specifically, epoxidized nano-silica undergoes an amidation reaction with aminoimidazole, introducing imidazole groups onto the surface of the nano-silica. On the one hand, this inhibits the aggregation and sedimentation of nanoparticles through steric hindrance; on the other hand, it coordinates with titanium chelates on the surface of the filler in the polyester layer, improving the wear resistance of the antifouling layer.

[0026] In any of the above technical solutions, the microporous structure is formed by laser etching.

[0027] In any of the above technical solutions, the pore size of the microporous structure is 50–200 μm.

[0028] Secondly, this application provides a method for preparing a polyester film, comprising the following operations according to the raw material ratio of any of the polyester films described: The polyester layer raw material is melt-blended in a twin-screw extruder, the melt is extruded through a T-die, and biaxially stretched to a fixed thickness to obtain the polyester layer; The antifouling layer raw materials are mixed to obtain a slurry, the slurry is coated on the surface of the polyester layer, and cured to obtain the antifouling layer; A hot melt adhesive of 30±10 g / ㎡ is applied to the surface of the polyester layer away from the anti-fouling layer to form a hot melt adhesive backing layer, thus obtaining a polyester film.

[0029] In any of the above technical solutions, the longitudinal stretching ratio of the biaxial stretching is 3.0, and the transverse stretching ratio is 3.2.

[0030] In any of the above technical solutions, the melt blending temperature is 300–310°C.

[0031] In any of the above technical solutions, the thickness of the polyester layer is preferably 0.08 to 0.5 mm.

[0032] Thirdly, this application provides a polyester film-faced furniture panel, comprising a substrate, an impregnated paper, and any of the aforementioned polyester films stacked sequentially.

[0033] Fourthly, this application provides a method for preparing a polyester film-faced furniture board, comprising: Substrate sanding: Sand the substrate blank to a fixed thickness as required; Composite hot pressing: Impregnated paper and polyester film are placed sequentially on the surface of the substrate and then hot pressed; unit pressure 3.0~4.0MPa, temperature 180~185℃, hot pressing time 50~55s; Curing: Place the hot-pressed boards in a dry, well-ventilated area, stack them neatly, and allow internal stress to fully release. Use a first-in, first-out approach, and cure for at least 3 days to ensure the flatness and dimensional stability of the boards. Trim the edges only after the boards have cooled completely. Trimming: The sanded substrate is cut into finished specifications, generally 1220*2440mm, with square, straight, smooth corners and no obvious saw marks, burnt edges, burrs or other defects.

[0034] It is important to note that thickness sanding typically uses 240-320 grit to ensure the substrate thickness meets requirements, the board surface is flat, free of dents, wavy lines, sanding defects, and contamination. The impregnating paper and polyester film must completely cover the substrate; when the polyester film is dark, gray impregnating paper should be used; when the polyester film is light, white impregnating paper should be used. This prevents the substrate from showing through, affecting the appearance quality. Hot-pressed steel sheet textures include soft light, sandblasted texture, small embossed, starry sky texture, matte slightly rough texture, rock texture, and real wood feel, resulting in different textured effects on the pressed board surface.

[0035] In any of the above technical solutions, the substrate is an ENF-grade engineered wood panel, preferably a plywood core, blockboard core, particleboard core, or oriented strand board core.

[0036] In any of the above technical solutions, the basis weight of the impregnated film paper is 80-90 g / m². 2 .

[0037] In summary, this application has the following beneficial effects: This application overcomes the heat resistance limitations of traditional PET decorative materials by utilizing a PCT and PPS composite resin system, achieving high-precision deep embossing under hot-pressing conditions of 180–185℃, with complete and clear texture replication. Furthermore, by introducing a carboxyl-terminated polybutadiene toughening agent, microcracks caused by stress concentration are eliminated, compensating for the increased brittleness caused by PPS and ensuring the integrity of complex structures during hot-pressing. The nano-silica in the anti-fouling layer, after amidation modification, improves the wear resistance and durability of the anti-fouling layer, and significantly enhances the nano-dispersion stability. This application expands the possibilities of home veneer finishes in the field of three-dimensional decoration, meeting the personalized needs of the high-end market. Detailed Implementation Preparation Example

[0038] Preparation Example 1-1, maleic anhydride-styrene-glycidyl methacrylate copolymer, was prepared by the following operation: Under nitrogen protection, 2000 mL of toluene, 250 g of maleic anhydride, and 350 g of styrene were added to a reactor. The mixture was heated to 85 °C and stirred until dissolved to obtain a premix. A mixture of 400 g of glycidyl methacrylate and 10 g of azobisisobutyronitrile was added dropwise to the premix over 2 hours. The reaction was maintained at 85 °C for 5 hours. After cooling to room temperature, the reaction solution was poured into ethanol to precipitate the solid, which was then filtered to obtain a white solid. The solid was washed three times with ethanol and dried under vacuum at 60 °C for 24 hours to obtain the copolymer.

[0039] Preparation Examples 1-2, maleic anhydride-styrene-glycidyl methacrylate copolymer, were prepared according to the following operation: Under nitrogen protection, 2000 mL of toluene, 200 g of maleic anhydride, and 300 g of styrene were added to a reactor. The mixture was heated to 80 °C and stirred until dissolved to obtain a premix. A mixture of 500 g of glycidyl methacrylate and 10 g of azobisisobutyronitrile was added dropwise to the premix over 2 hours. The reaction was maintained at 80 °C for 6 hours. After cooling to room temperature, the reaction solution was poured into ethanol to precipitate the solid, which was then filtered to obtain a white solid. The solid was washed three times with ethanol and dried under vacuum at 60 °C for 24 hours to obtain the copolymer.

[0040] Preparation Examples 1-3, maleic anhydride-styrene-glycidyl methacrylate copolymers, were prepared according to the following operation: Under nitrogen protection, 2500 mL of toluene, 300 g of maleic anhydride, and 400 g of styrene were added to a reactor. The mixture was heated to 80 °C and stirred to dissolve, yielding a premix. A mixture of 300 g of glycidyl methacrylate and 15 g of azobisisobutyronitrile was added dropwise to the premix over 2 hours. The reaction was maintained at 82 °C for 6 hours. After cooling to room temperature, the reaction solution was poured into ethanol to precipitate the solid, which was then filtered to obtain a white solid. The solid was washed three times with ethanol and dried under vacuum at 60 °C for 24 hours to obtain the copolymer.

[0041] Preparation Examples 1-4, maleic anhydride-styrene copolymers, differ from Preparation Example 1-1 in that an equal amount of maleic anhydride is used to replace glycidyl methacrylate.

[0042] Preparation Examples 1-5, styrene-glycidyl methacrylate copolymers, differ from Preparation Example 1-1 in that maleic anhydride is replaced with an equal amount of glycidyl methacrylate.

[0043] Preparation Example 2-1, chelated titanate coupling agent modified filler, the preparation method is as follows: 100g of montmorillonite with a D50 of 10 micrometers was vacuum dried at 110℃ for 4 hours until the moisture content was ≤0.1%. Under nitrogen protection, the dried montmorillonite was added to 300mL of acetone and ultrasonically dispersed for 30 minutes; 5g of diisopropyl di(acetylacetone) titanate (chelating titanate coupling agent) was added and stirred at 60℃ for 2 hours; after centrifugation, the mixture was washed three times with ethanol and vacuum dried at 80℃ for 4 hours to obtain the modified filler.

[0044] Preparation Example 2-2, chelated titanate coupling agent modified filler, the preparation method is as follows: 100g of calcium carbonate with a D50 of 5 microns was vacuum dried at 120℃ for 3 hours until the water content was ≤0.1%. Under nitrogen protection, the dried calcium carbonate was added to 300mL of acetone and ultrasonically dispersed for 30 minutes; 3g of diisopropyl di(acetylacetone) titanate (chelating titanate coupling agent) was added and stirred at 60℃ for 1.5 hours; after centrifugation, the mixture was washed three times with ethanol and vacuum dried at 80℃ for 4 hours to obtain the modified filler.

[0045] Preparation Examples 2-3: Chelated titanate coupling agent modified filler, prepared by the following method: 100g of alumina with a D50 of 10 micrometers was vacuum dried at 130℃ for 3 hours until the water content was ≤0.1%. Under nitrogen protection, the dried alumina was added to 500mL of acetone and ultrasonically dispersed for 30 minutes; 6g of diisopropyl di(acetylacetone) titanate (chelating titanate coupling agent) was added and stirred at 60℃ for 3 hours; after centrifugation, the alumina was washed three times with ethanol and vacuum dried at 80℃ for 4 hours to obtain the modified filler.

[0046] Preparation Example 2-4, a non-chelating titanate coupling agent modified filler, differs from Preparation Example 2-1 in that an equal amount of triisostearate titanate isopropyl ester is used instead of di(acetylacetone) titanate diisopropyl ester.

[0047] Preparation Example 3-1: Modified nano-silica was prepared by the following method: 100g of nano-silica (D50 particle size 20nm) was dispersed in 500mL of ethanol, 7.5g of γ-glycidyl oxypropyltrimethoxysilane was added, and the mixture was refluxed at 70℃ for 2 hours; 10g of aminoimidazole and 1g of triethylamine were added, and the mixture was reacted at 60℃ for 4 hours; the mixture was centrifuged, washed three times with ethanol, and dried at 80℃ to obtain modified nano-silica.

[0048] Preparation Example 3-2: Modified nano-silica was prepared by the following method: 100g of nano-silica (D50 particle size 30nm) was dispersed in 400mL of ethanol, 5g of β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane was added, and the mixture was refluxed at 70℃ for 2 hours; 8g of aminoimidazole and 0.8g of triethylamine were added, and the mixture was reacted at 55℃ for 5 hours; the mixture was centrifuged, washed three times with ethanol, and dried at 80℃ to obtain modified nano-silica.

[0049] Preparation Example 3-3: Modified nano-silica was prepared by the following method: 100g of nano-silica (D50 particle size 10nm) was dispersed in 500mL of ethanol, 12g of 3-glycidyl etheroxypropyltriisopropoxysilane was added, and the mixture was refluxed at 70℃ for 2 hours; 12g of aminoimidazole and 1.2g of triethylamine were added, and the mixture was reacted at 60℃ for 4 hours; the mixture was centrifuged, washed three times with ethanol, and dried at 80℃ to obtain modified nano-silica.

[0050] Preparation Examples 3-4: Modified nano-silica was prepared according to the following method: 100g of nano-silica (D50 particle size 20nm) was dispersed in 500mL of ethanol, and 7.5g of γ-glycidyl oxypropyltrimethoxysilane was added. The mixture was refluxed at 70℃ for 2 hours. After centrifugation, the mixture was washed three times with ethanol and dried at 80℃ to obtain modified nano-silica. Example

[0051] Example 1: A polyester film was prepared according to the following steps: Polyester layer extrusion: 700g of poly(1,4-cyclohexanedimethyl terephthalate) (PCTG LX100), 200g of polyphenylene sulfide (PPS-hGR50), 35g of maleic anhydride-styrene-glycidyl methacrylate copolymer (Preparation Example 1-1), 30g of carboxyl-terminated liquid polybutadiene (Mn=2000), 25g of chelated titanate coupling agent modified filler (Preparation Example 2-1), 7g of silicone powder lubricant, and 3g of antioxidant 1010 were fed into a twin-screw extruder (length-to-diameter ratio 48:1) and melt-blended at 305°C. The melt was extruded through a T-die and biaxially stretched with a longitudinal stretch ratio of 3.0 and a transverse stretch ratio of 3.2 to a thickness of 0.2mm.

[0052] Laser micropore processing: A micropore array structure with a pore diameter of 100 μm (density 40 pores / cm) was etched on the surface of the polyester layer using a CO2 laser (power 20W). 2 ).

[0053] Anti-fouling coating: 100g of modified nano-silica (Preparation Example 3-1), 2g of HMPP photoinitiator, and 1g of BYK-180 dispersant were added to 896g of fluorosilicone-modified polyurethane acrylate (UV-9843-9), and ultrasonically treated for 30min, controlling the temperature to ≤40℃; slit coating was applied to the surface of the polyester layer (the side with the microporous structure); UV curing (1000mJ / cm) was then performed. 2 The dry film thickness after curing is 0.8±0.1μm.

[0054] Backing coating: A closed-cell isocyanate polyurethane hot melt adhesive is sprayed onto the other side of the polyester layer, with a coating amount of 35 g / m². 2 Cool and shape.

[0055] Example 2: A polyester film was prepared according to the following steps: Polyester layer extrusion: 792g of poly(1,4-cyclohexanedimethyl terephthalate) (PCTG JN200), 150g of polyphenylene sulfide (FX55T1), 20g of maleic anhydride-styrene-glycidyl methacrylate copolymer (Preparation Example 1-2), 20g of carboxyl-terminated liquid polybutadiene (Mn=1000), 10g of chelated titanate coupling agent modified filler (Preparation Example 2-2), 4g of silicone powder lubricant, and 4g of antioxidant 1010 were fed into a twin-screw extruder (length-to-diameter ratio 48:1) and melt-blended at 300°C. The melt was extruded through a T-die and biaxially stretched with a longitudinal stretch ratio of 3.0 and a transverse stretch ratio of 3.3 to a thickness of 0.15mm.

[0056] Laser micropore processing: A micropore array structure with a pore diameter of 50 μm (density 100 pores / cm) was etched on the surface of the polyester layer using a CO2 laser (power 20W). 2 ).

[0057] Anti-fouling layer coating: 50g of modified nano-silica (Preparation Example 3-2), 1g of HMPP photoinitiator, and 0.5g of BYK-180 dispersant were added to 846.5g of fluorosilicone modified polyurethane acrylate (UV-9843-9), and ultrasonically treated for 30min, controlling the temperature to ≤40℃; slit coating was applied to the surface of the polyester layer (the side with the microporous structure); UV curing (800mJ / cm) was then performed. 2 The dry film thickness after curing is 0.6±0.1μm.

[0058] Backing coating: A blocked isocyanate polyurethane hot melt adhesive is sprayed onto the other side of the polyester layer, with a coating amount of 20 g / m². 2 Cool and shape.

[0059] Example 3: A polyester film was prepared according to the following steps: Polyester layer extrusion: 620g of poly(1,4-cyclohexanedimethyl terephthalate) (PCTG LX100), 250g of polyphenylene sulfide (PPS-hGR50), 50g of maleic anhydride-styrene-glycidyl methacrylate copolymer (Preparation Examples 1-3), 40g of carboxyl-terminated liquid polybutadiene (Mn=3000), 30g of chelated titanate coupling agent modified filler (Preparation Examples 2-3), and 10g of silicone powder lubricant were fed into a twin-screw extruder (length-to-diameter ratio 48:1) and melt-blended at 310°C. The melt was extruded through a T-die and biaxially stretched to a thickness of 0.3mm with a longitudinal stretch ratio of 3.0 and a transverse stretch ratio of 3.2.

[0060] Laser micropore processing: A micropore array structure with a pore diameter of 150 μm (density 40 pores / cm) was etched on the surface of the polyester layer using a CO2 laser (power 20W). 2 ).

[0061] Anti-fouling coating: 150g of modified nano-silica (Preparation Example 3-1), 2g of HMPP photoinitiator, and 1.5g of BYK-180 dispersant were added to 844g of fluorosilicone-modified polyurethane acrylate (UV-9843-9), and ultrasonically treated for 30min, controlling the temperature to ≤40℃; slit coating was applied to the surface of the polyester layer (the side with the microporous structure); UV curing (1200mJ / cm) was then performed. 2 The dry film thickness after curing is 1.0±0.1μm.

[0062] Backing coating: A closed-cell isocyanate polyurethane hot melt adhesive is sprayed onto the other side of the polyester layer, with a coating amount of 35 g / m². 2 Cool and shape.

[0063] Example 4, a polyester film, differs from Example 1 in that an equal amount of maleic anhydride-styrene-glycidyl methacrylate copolymer is used to replace the carboxyl-terminated liquid polybutadiene.

[0064] Example 5, a polyester film, differs from Example 1 in that an equal amount of non-chelating titanate coupling agent modified filler from Preparation Examples 2-4 is used instead of the chelating titanate coupling agent modified filler from Preparation Example 2-1.

[0065] Example 6, a polyester film, differs from Example 1 in that the modified nano-silica of Preparation Example 3-1 is replaced with an equal amount of the modified nano-silica of Preparation Example 3-4.

[0066] Example 7, a polyester film, differs from Example 5 in that the modified nano-silica of Preparation Example 3-1 is replaced with an equal amount of the modified nano-silica of Preparation Example 3-4. Comparative Example

[0067] Comparative Example 1, a polyester film, differs from Example 1 in that an equal amount of maleic anhydride-styrene copolymer prepared in Examples 1-4 is used instead of maleic anhydride-styrene-glycidyl methacrylate copolymer prepared in Example 1-1.

[0068] Comparative Example 2, a polyester film, differs from Example 1 in that an equal amount of the styrene-glycidyl methacrylate copolymer of Preparation Examples 1-5 is used instead of the maleic anhydride-styrene-glycidyl methacrylate copolymer of Preparation Example 1-1.

[0069] Comparative Example 3, a polyester film, differs from Example 1 in that the amount of poly(1,4-cyclohexanedimethyl terephthalate) (PCTG LX100) is 550g and the amount of polyphenylene sulfide (PPS-hGR50) is 350g.

[0070] Comparative Example 4, a polyester film, differs from Example 1 in that the amount of poly(1,4-cyclohexanedimethyl terephthalate) (PCTG LX100) is 800g and the amount of polyphenylene sulfide (PPS-hGR50) is 100g.

[0071] Comparative Example 5, a polyester film, differs from Example 1 in that an equal amount of poly(1,4-cyclohexanediethanol terephthalate) is used instead of polyphenylene sulfide. Application examples

[0072] Application Example 1: A polyester film-faced furniture board is prepared according to the following steps: Substrate treatment: ENF grade plywood (1220×2440×18mm) is sanded with 240 mesh sander belt to a thickness tolerance of ≤0.1mm.

[0073] Composite hot pressing: The impregnated film paper (gray, 85g / m²) is then pressed... 2 Cut to the board size. Layer the substrate, impregnated paper, and polyester film obtained in Example 1 in sequence (hot melt adhesive layer facing down); hot pressing parameters: unit pressure 3.5MPa, temperature 183℃, time 52s (the steel plate texture is embossed wood grain, and the maximum embossing depth is 0.08mm).

[0074] Health maintenance: Stacked in a ventilated environment at 25℃ for 4 days, and the flatness is tested after trimming (≤0.3mm / m).

[0075] Application Example 2: A polyester film-faced furniture board is prepared according to the following steps: Substrate treatment: ENF grade particleboard (1220×2440×18mm) is sanded with 240 mesh sander belt to a thickness tolerance of ≤0.1mm.

[0076] Composite hot pressing: The impregnated film paper (80g / m²) is then pressed together. 2Cut to the board size. Layer the substrate, impregnated paper, and polyester film obtained in Example 2 in sequence (hot melt adhesive layer facing down); hot pressing parameters: unit pressure 3.0MPa, temperature 180℃, time 50s (the steel plate texture is sandblasted, and the maximum embossing depth is 0.05mm).

[0077] Health maintenance: Stacked in a ventilated environment at 25℃ for 4 days, and the flatness is tested after trimming (≤0.3mm / m).

[0078] Application Example 3: A polyester film-faced furniture board is prepared according to the following steps: Substrate treatment: ENF grade oriented strand board (OSB, 1220×2440×18mm) is sanded with 240 mesh sander belt to a thickness tolerance of ≤0.1mm.

[0079] Composite hot pressing: The impregnated film paper (gray, 90g / m²) is then pressed... 2 Cut to the board size. Layer the substrate, impregnated paper, and polyester film obtained in Example 3 in sequence (hot melt adhesive layer facing down); hot pressing parameters: unit pressure 4.0MPa, temperature 185℃, time 55s (the steel plate texture is rock texture, and the maximum embossing depth is 0.12mm).

[0080] Application Examples 4 to 7: A polyester film-faced furniture board, which differs from Application Example 1 in that an equal amount of polyester film obtained in Examples 4 to 7 is used to replace the polyester film obtained in Example 1.

[0081] Compared with Application Examples 1 to 5, a polyester film-faced furniture board is different from Application Example 1 in that the polyester film obtained in Example 1 is replaced with an equal amount of the polyester film obtained in Comparative Examples 1 to 5. Performance testing

[0082] Experiment 1: Polyester film forming quality inspection In the finished decorative panels of application examples 1-7 and comparison examples 1-5, (1) the proportion of test panels with poor texture forming quality (including blurred, missing, collapsed, and deformed textures) is recorded as the appearance defect rate; (2) the proportion of test panels with cracked and broken textures and chipped edges is recorded as the appearance damage rate.

[0083] Test 2. Abrasion resistance of the anti-fouling layer surface The test was conducted in accordance with the provisions of "4.43 Determination of Surface Abrasion Resistance" in GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels". A Taber abrasion tester with an H-18 abrasive head and a load of 1 kg was used; the number of abrasion cycles was recorded with the exposure of the underlying polyester layer as the endpoint.

[0084] Test 3, Stain Resistance Test The test was conducted in accordance with the provisions of "4.40.2 Determination of Surface Stain Resistance" in GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels", using Group 3 contaminants. The influence of the test materials on the surface of the specimens was evaluated according to the following standards: Level 5: No significant change; Level 4: Slight changes in gloss and / or color; Grade 3: Moderate variation in gloss and / or color; Grade 2: Significant changes in gloss and / or color; Level 1: Surface deformation and / or blistering.

[0085] Table 1. Performance Test Results

[0086] Analysis of experimental results: Example 4 (using a compatibilizer instead of terminal carboxyl-terminated liquid polybutadiene) showed a significantly increased surface breakage rate. This indicates the beneficial effect of terminal carboxyl-terminated liquid polybutadiene on improving the impact toughness of polyester films. In deep embossing, it can suppress brittle fracture at texture corners and edges caused by stress concentration.

[0087] The wear resistance of Examples 5 (using non-chelated titanate filler), 6 (silica surface without imidazole grafting), and 7 (using non-chelated titanate without imidazole grafting) all decreased significantly, and the decrease was similar. This indicates that the chelated titanate modified filler and imidazole grafted nano-silica have a synergistic effect in enhancing the wear resistance of the antifouling layer, and neither can be omitted. The two form interlayer bonds through coordination, enhancing the adhesion strength of the antifouling layer.

[0088] The appearance defect rates of Comparative Example 1 (using maleic anhydride-styrene copolymer as a compatibilizer) and Comparative Example 2 (using styrene-glycidyl methacrylate copolymer as a compatibilizer) increased significantly, indicating that the use of compatibilizers with single active groups makes the polyester film prone to deformation and other appearance quality problems, which is not conducive to reducing the appearance defect rate. Furthermore, the reduced compatibilizing effect leads to a loss of mechanical properties, resulting in an increase in the breakage rate.

[0089] Comparative Example 3 (excess polystyrene) showed a significant increase in both appearance defect rate and appearance damage rate. This may be because excessive polystyrene increases shrinkage after hot pressing, leading to surface depressions or edge warping and collapse, thus increasing the appearance defect rate. Secondly, excessive polystyrene weakens the flowability during hot pressing, increasing the brittleness of the polyester layer, resulting in blurred textures and increased cracking and breakage after hot pressing, further raising the appearance defect rate and appearance damage rate.

[0090] Comparative Example 4 (excessive PCT, insufficient PPS content) and Comparative Example 5 (no PPS added) showed an increase in appearance defect rate and a decrease in appearance breakage rate. This may be because the reduction or even absence of PPS deteriorates the rigidity of the plastic elastomer after hot pressing, reducing its resistance to deformation collapse and leading to an increase in undesirable appearances such as blurred textures. Simultaneously, the brittleness of the polyester layer decreases, reducing brittle fracture and edge chipping.

[0091] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A polyester film, characterized in that, It includes a hot-melt adhesive layer and a polyester layer that are bonded together; by weight percentage, the raw materials of the polyester layer include: 60-80% poly(1,4-cyclohexanediol) terephthalate, 15-25% polyphenylene sulfide, 2-5% maleic anhydride-styrene-glycidyl methacrylate copolymer, 1-3% filler, and 0.1-2% additives.

2. The polyester film according to claim 1, characterized in that, The maleic anhydride-styrene-glycidyl methacrylate copolymer is obtained by free radical copolymerization of monomers comprising the following mass percentages: 20-30% maleic anhydride, 30-40% styrene, and the balance being glycidyl methacrylate.

3. The polyester film according to claim 1, characterized in that, The raw material for the polyester layer includes 2-4% carboxyl-terminated liquid polybutadiene.

4. The polyester film according to claim 1, characterized in that, The filler surface is grafted with a chelated titanate coupling agent.

5. The polyester film according to claim 1, characterized in that, The surface of the polyester layer away from the hot melt adhesive layer has a microporous structure, and the surface of the polyester layer with the microporous structure is coated with an anti-fouling layer with a thickness of 0.5 to 1.0 μm; by mass percentage, the raw materials of the anti-fouling layer include 5 to 15% modified nano-silica and the balance being hydrophobic modified resin.

6. The polyester film according to claim 5, characterized in that, The modified nano-silica is obtained by amidation reaction of epoxidized nano-silica with aminoimidazole.

7. The polyester film according to claim 6, characterized in that, The raw materials for the modified nano silica include nano silica, epoxy siloxane compounds, and aminoimidazole in a mass ratio of 100:5 to 10:8 to 12.

8. The polyester film according to claim 1, characterized in that, The epoxy siloxane compound is selected from one or more of γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, and 3-glycidoxypropyltriisopropoxysilane.

9. A method for preparing a polyester film, characterized in that, According to the raw material ratio of the polyester film according to any one of claims 1 to 8, the following operation is performed: The polyester layer raw material is melt-blended in a twin-screw extruder, the melt is extruded through a T-die, and biaxially stretched to a fixed thickness to obtain the polyester layer; The antifouling layer raw materials are mixed to obtain a slurry, the slurry is coated on the surface of the polyester layer, and cured to obtain the antifouling layer; A hot melt adhesive of 30±10 g / ㎡ is applied to the surface of the polyester layer away from the anti-fouling layer to form a hot melt adhesive backing layer, thus obtaining a polyester film.

10. A polyester film-faced furniture board, characterized in that, It includes a substrate, an impregnated paper, and a polyester film as described in any one of claims 1 to 9, stacked sequentially.

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