Flame-retardant self-adhesive PVC decorative film and preparation method thereof

Abstract

The invention relates to the technical field of PVC decorative films, and discloses a flame-retardant self-adhesive PVC decorative film and a preparation method. The flame-retardant self-adhesive PVC decorative film is a multi-layer film composite layered structure, including a flame-retardant PVC film surface layer, a color pattern layer, a flame-retardant PVC film bottom layer, an acrylic pressure-sensitive adhesive layer, and a single silicon double-leached embossed release paper layer; the invention uses sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite as a composite flame retardant to fill and modify polyvinyl chloride, thereby significantly improving the flame retardant properties of the polyvinyl chloride film material. And using it as the film surface layer and film bottom layer of the PVC decorative film, the flame retardant properties of the decorative film are improved, and the requirements of the fireproof grade for indoor decoration can be met. The single silicon double-leached embossed release paper layer can ensure the flatness of the product, which is more conducive to the product being attached to the wall without generating bubbles.

Description

Technical Field

[0001] The invention relates to the technical field of PVC decorative films, in particular to a flame-retardant self-adhesive PVC decorative film and a preparation method thereof. Background Art

[0002] Polyvinyl chloride film materials have good mechanical, insulating, and anti-corrosion properties. They can be made into decorative films and composited with wood, plastic plates, metal plates and other substrates to make decorative materials. They are widely used in household appliances, interior decoration, billboards, etc. At present, polyvinyl chloride film materials have poor thermal stability, and although polyvinyl chloride has certain flame retardancy, it will also burn when exposed to open flames. Adding stabilizers, flame retardants, anti-ultraviolet absorbers and other additives to polyvinyl chloride can improve the heat resistance and flame retardancy of polyvinyl chloride film materials.

[0003] Common flame retardants for polyvinyl chloride include aluminum hydroxide, antimony trioxide, etc. The dosage of these flame retardants is large, which will affect the mechanical properties of the material. Magnesium aluminum hydrotalcite is a two-dimensional lamellar inorganic mineral with the advantages of good heat resistance, excellent electrical insulation, high flame retardancy, etc. It has good practical applications in polymer materials. However, magnesium aluminum hydrotalcite has problems such as easy agglomeration and poor compatibility with polymer matrices, and cannot effectively improve the flame retardancy and thermal stability of the material. At present, the main methods for modifying magnesium aluminum hydrotalcite include grafting modification, coating modification, intercalation modification, etc. Summary of the invention

[0004] To solve the technical problem, the present invention provides a PVC decorative film which has the problems of poor flame retardancy and poor thermal stability.

[0005] Technical solution: A flame-retardant self-adhesive PVC decorative film, which is a multi-layer film composite layered structure, which includes, from top to bottom, a flame-retardant PVC film surface layer, a color pattern layer, a flame-retardant PVC film bottom layer, an acrylic pressure-sensitive adhesive layer, and a single silicone double-coated embossed release paper layer.

[0006] The flame-retardant PVC film surface layer or the flame-retardant PVC film bottom layer is a flame-retardant modified PVC film material, and the preparation method thereof is as follows: polyvinyl chloride resin, plasticizer, stabilizer, lubricant, sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite are placed in a mixer for hot mixing, and the material is cooled and discharged; then the material is placed in a screw extruder, blown into a film after extrusion, cooled and shaped, and then pulled and wound for collection to obtain the flame-retardant modified PVC film material.

[0007] Furthermore, the color pattern layer is attached to the upper surface of the flame retardant PVC film bottom layer by printing or coating; the thickness of the flame retardant PVC film bottom layer is 0.080-0.100 mm, and the thickness of the color pattern layer is 0.020-0.050 mm.

[0008] Furthermore, the flame retardant PVC film surface layer is attached to the surface of the color pattern layer by high-temperature thermal bonding; the thickness of the flame retardant PVC film surface layer is 0.060-0.100 mm.

[0009] Furthermore, the acrylate pressure-sensitive adhesive layer is connected to the single silicon surface of the single silicon double-leaf embossed release paper layer by coating; the thickness of the single silicon double-leaf embossed release paper layer is 0.12-0.15mm, and the thickness of the acrylate pressure-sensitive adhesive layer is 0.030-0.050mm.

[0010] Furthermore, the overall thickness of the flame retardant self-adhesive PVC decorative film is 0.300-0.450 mm.

[0011] Furthermore, the mass of the magnesium aluminum hydrotalcite modified by the sulfonate phosphate flame retardant intercalation is 5-30% of the mass of the polyvinyl chloride resin.

[0012] Furthermore, the preparation method of the sulfonate phosphate flame retardant intercalation modified magnesium aluminum hydrotalcite is:

[0013] S1. Add phenyl dichloride phosphate, sodium 3-chloro-2-hydroxypropanesulfonate and triethylamine in a molar ratio of 1:(2.6-3.4):(2.6-3.6) to tetrahydrofuran, stir and react at 30-45°C for 18-36h, distill under reduced pressure, wash with water and dry to obtain a sulfonate flame retardant precursor. The reaction formula is:

[0014]

[0015] S2, add a sulfonate flame retardant precursor with a molar ratio of 1:(2.4-3) to isopropanol, and the structural formula is N-methyl fatty amine, wherein n is any integer between 8 and 12; stirring to dissolve, adding a sodium hydroxide aqueous solution with a mass fraction of 25-40%, condensing and refluxing at 80-85°C for 12-18h, adding dilute hydrochloric acid to neutralize the solution to pH 7, removing isopropanol by vacuum distillation, adding distilled water to precipitate, filtering, washing with n-hexane and methanol in turn, and drying to obtain a sulfonate phosphate flame retardant. The reaction formula is:

[0016]

[0017] S3. Add magnesium aluminum hydrotalcite to distilled water, stir and disperse, then add ethanol and sulfonate phosphate flame retardant, heat to 75-80°C, condense and reflux and stir for 6-12h, filter, wash with ethanol, and dry to obtain sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite.

[0018] Furthermore, the mass of the sulfonate phosphate flame retardant is 30-150% of the mass of the magnesium aluminum hydrotalcite.

[0019] Furthermore, the temperature of hot mixing is 80-100°C, the time is 10-15min; the speed of the screw extruder is 50-80r / min, the temperature of zones I to VI is 100-175°C; the blow ratio during blow molding is 3-4, and the speed during traction is 40-60m / min.

[0020] Furthermore, a method for preparing a flame-retardant self-adhesive PVC decorative film is provided as follows: a color pattern layer is attached to the upper surface of a flame-retardant PVC film bottom layer by printing or coating, and then the flame-retardant PVC film surface layer is attached to the surface of the color pattern layer by high-temperature heating; then, the surface of a single silicone double-coated embossed release paper layer is coated on one side of the acrylic pressure-sensitive adhesive layer; finally, the other side of the acrylic pressure-sensitive adhesive layer is attached to the lower surface of the flame-retardant PVC film bottom layer to obtain a flame-retardant self-adhesive PVC decorative film.

[0021] The technical effect of the present invention is as follows: the present invention uses dichlorophenyl phosphate, sodium 3-chloro-2-hydroxypropanesulfonate, N-methyl-n-octylamine and the like as reaction raw materials to prepare a novel phosphate flame retardant containing disulfonate and long-chain fatty alkyl groups, wherein the disulfonate groups contained in the novel phosphate flame retardant can undergo ion exchange with magnesium aluminum hydrotalcite, thereby realizing intercalation modification of magnesium aluminum hydrotalcite by the sulfonate phosphate flame retardant.

[0022] The present invention uses sulfonate phosphate flame retardant intercalation modified magnesium aluminum hydrotalcite as a composite flame retardant to fill and modify polyvinyl chloride. After the magnesium aluminum hydrotalcite is modified by flame retardant intercalation, the di-aliphatic alkyl long chains contained in it have a large steric hindrance effect, which can reduce the agglomeration of the magnesium aluminum hydrotalcite and improve its dispersibility. In addition, the aliphatic alkyl long chains have good compatibility with polyvinyl chloride, and can be chain-entangled with the polyvinyl chloride molecular chain, so that the magnesium aluminum hydrotalcite and the polyvinyl chloride are physically cross-linked, and the movement of the polyvinyl chloride molecular chain is restricted, which is beneficial to improving the thermal stability and tensile strength of the polyvinyl chloride. At the same time, the phosphate flame retardant group contained in the flame retardant has gas phase and condensed phase flame retardant effects, and has a synergistic flame retardant effect with the uniformly dispersed magnesium aluminum hydrotalcite, which significantly improves the flame retardant properties of the polyvinyl chloride film material.

[0023] The present invention uses flame-retardant modified PVC film material as the film surface layer and film bottom layer of the PVC decorative film, which significantly improves the flame retardant performance of the decorative film and can meet the requirements of indoor decoration for fire protection level. At the same time, acrylic pressure-sensitive adhesive is used, which can meet the requirements of repeatedly pasting the decorative film on walls of different textures. The single silicon double-coated embossed release paper layer can ensure the flatness of the product, which is more conducive to the product being pasted on the wall without generating bubbles. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the flame-retardant self-adhesive PVC decorative film.

[0025] In the figure: 1 is the flame-retardant PVC film surface layer, 2 is the color pattern layer, 3 is the flame-retardant PVC film bottom layer, 4 is the acrylic pressure-sensitive adhesive layer, and 5 is the single silicone double-coated embossed release paper layer. DETAILED DESCRIPTION

[0026] The above content of the present invention is further described in detail below in conjunction with specific implementation modes, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments.

[0027] Example 1

[0028] (1) Add 4 mmol of phenyl dichloride phosphate, 10.4 mmol of sodium 3-chloro-2-hydroxypropanesulfonate, and 10.4 mmol of triethylamine to 20 mL of tetrahydrofuran, stir and react at 30°C for 36 hours, distill under reduced pressure, wash with water, and then dry to obtain a sulfonate flame retardant precursor. The structural formula is

[0029] (2) Add 5 mmol sulfonate flame retardant precursor and 12 mmol N-methyloctylamine to 30 mL isopropanol. Stir and dissolve, add 25% sodium hydroxide aqueous solution by mass, condense and reflux at 80°C for 18h, add dilute hydrochloric acid to neutralize the solution to pH 7, remove isopropanol by vacuum distillation, add distilled water to precipitate, filter, wash with n-hexane and methanol in turn, and dry to obtain sulfonate phosphate flame retardant. The structural formula is

[0030] Example 2

[0031] (1) Add 4 mmol of phenyl dichloride phosphate, 13.6 mmol of sodium 3-chloro-2-hydroxypropanesulfonate, and 14.4 mmol of triethylamine to 30 mL of tetrahydrofuran, stir and react at 45°C for 18 hours, distill under reduced pressure, wash with water, and then dry to obtain a sulfonate flame retardant precursor. The structural formula is

[0032] (2) Add 5 mmol sulfonate flame retardant precursor and 15 mmol N-methyl-1-dodecylamine to 40 mL isopropanol. Stir and dissolve, add 40% sodium hydroxide aqueous solution by mass, condense and reflux at 85°C for 12h, add dilute hydrochloric acid to neutralize the solution to pH 7, remove isopropanol by vacuum distillation, add distilled water to precipitate, filter, wash with n-hexane and methanol in turn, and dry to obtain sulfonate phosphate flame retardant. The structural formula is

[0033] Example 3

[0034] (1) Add 6 g of magnesium aluminum hydrotalcite to 600 mL of distilled water, stir and disperse, add 200 mL of ethanol and 1.8 g of sulfonate phosphate flame retardant (prepared according to the method of Example 2), heat to 80° C., condense and reflux and stir for 6 h, filter, wash with ethanol, and dry to obtain sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite.

[0035] (2) 100 g of polyvinyl chloride resin, 30 g of plasticizer dioctyl phthalate, 2.6 g of calcium zinc stabilizer, 3.2 g of lubricant stearic acid, and 5 g of sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite are placed in a mixer, mixed at 90° C. for 10 min, and cooled to discharge; then the material is placed in a screw extruder, the screw speed is 80 r / min, the temperatures of zones I to VI are 100° C., 150° C., 165° C., 170° C., 175° C., and 175° C., and after extrusion, it is blown into a film with a blow ratio of 3; cooled and shaped, and the film is pulled and wound for collection, and the pulling speed is 40 m / min to obtain a flame retardant modified PVC film material.

[0036] Example 4

[0037] (1) Add 6 g of magnesium aluminum hydrotalcite to 600 mL of distilled water, stir and disperse, add 200 mL of ethanol and 3.8 g of sulfonate phosphate flame retardant (prepared according to the method of Example 2), heat to 75° C., condense and reflux and stir for 12 h, filter, wash with ethanol, and dry to obtain sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite.

[0038] (2) 100 g of polyvinyl chloride resin, 30 g of plasticizer dioctyl phthalate, 2.6 g of calcium zinc stabilizer, 3.2 g of lubricant stearic acid, and 12 g of sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite are placed in a mixer, mixed at 100° C. for 10 min, and cooled to discharge; then the material is placed in a screw extruder, the screw speed is 80 r / min, the temperatures of zones I to VI are 100° C., 150° C., 165° C., 170° C., 175° C., and 175° C., and blown into a film after extrusion, with a blow ratio of 4; cooled and shaped, pulled and wound for collection, and the pulling speed is 50 m / min to obtain a flame retardant modified PVC film material.

[0039] Example 5

[0040] (1) Add 6 g of magnesium aluminum hydrotalcite to 600 mL of distilled water, stir and disperse, add 400 mL of ethanol and 6.2 g of sulfonate phosphate flame retardant (prepared according to the method of Example 2), heat to 80°C, condense and reflux and stir for 6 hours, filter, wash with ethanol, and dry to obtain sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite.

[0041] (2) 100 g of polyvinyl chloride resin, 30 g of plasticizer dioctyl phthalate, 2.6 g of calcium zinc stabilizer, 3.2 g of lubricant stearic acid, and 22 g of sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite are placed in a mixer, mixed at 100° C. for 12 min, and cooled to discharge; then the material is placed in a screw extruder, the screw speed is 50 r / min, the temperatures of zones I to VI are 100° C., 150° C., 165° C., 170° C., 175° C., and 175° C., and blown into a film after extrusion, with a blow ratio of 4; cooled and shaped, pulled and wound for collection, and the pulling speed is 40 m / min to obtain a flame retardant modified PVC film material.

[0042] Example 6

[0043] (1) Add 6 g of magnesium aluminum hydrotalcite to 600 mL of distilled water, stir and disperse, add 400 mL of ethanol and 9 g of sulfonate phosphate flame retardant (prepared according to the method of Example 1), heat to 80° C., condense and reflux and stir for 10 h, filter, wash with ethanol, and dry to obtain sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite.

[0044] (2) 100 g of polyvinyl chloride resin, 30 g of plasticizer dioctyl phthalate, 2.6 g of calcium zinc stabilizer, 3.2 g of lubricant stearic acid, and 30 g of sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite are placed in a mixer, mixed at 80° C. for 15 min, and cooled to discharge; then the material is placed in a screw extruder, the screw speed is 60 r / min, the temperatures of zones I to VI are 100° C., 150° C., 165° C., 170° C., 175° C., and 175° C., and after extrusion, it is blown into a film with a blow ratio of 4; cooled and shaped, and the film is drawn and wound for collection, with a drawing speed of 40 m / min to obtain a flame retardant modified PVC film material.

[0045] Comparative Example 1

[0046] (1) 100 g of polyvinyl chloride resin, 30 g of plasticizer dioctyl phthalate, 2.6 g of calcium zinc stabilizer, and 3.2 g of lubricant stearic acid are placed in a mixer, mixed at 90° C. for 10 min, and cooled to discharge; then the material is placed in a screw extruder, the screw speed is 80 r / min, the temperatures of zones I to VI are 100° C., 150° C., 165° C., 170° C., 175° C., and 175° C., and blown into a film after extrusion, with a blow ratio of 3; cooled and shaped, pulled and wound for collection, and the pulling speed is 40 m / min to obtain a flame-retardant modified PVC film material.

[0047] Comparative Example 2

[0048] 100g of polyvinyl chloride resin, 30g of plasticizer dioctyl phthalate, 2.6g of calcium zinc stabilizer, 3.2g of lubricant stearic acid, and 5g of magnesium aluminum hydrotalcite are placed in a mixer, mixed at 90°C for 10min, and cooled to discharge; then the material is placed in a screw extruder, the screw speed is 80r / min, the temperatures of zones I to VI are 100°C, 150°C, 165°C, 170°C, 175°C, and 175°C, and blown into a film after extrusion with a blowing ratio of 3; cooled and shaped, the film is towed and wound for collection, and the towing rate is 40m / min to obtain a flame-retardant modified PVC film material.

[0049] Comparative Example 3

[0050] (1) Add 4 mmol of phenyl dichlorophosphate, 13.6 mmol of sodium 3-chloro-2-hydroxypropanesulfonate, and 14.4 mmol of triethylamine to 30 mL of tetrahydrofuran, stir and react at 45° C. for 18 h, distill under reduced pressure, wash with water, and then dry to obtain a sulfonate flame retardant precursor.

[0051] (2) Add 5 mmol sulfonate flame retardant precursor and 15 mmol N-ethylmethylamine to 40 mL isopropanol. Stir and dissolve, add 40% sodium hydroxide aqueous solution by mass, condense and reflux at 85°C for 12 hours, add dilute hydrochloric acid to neutralize the solution to pH 7, remove isopropanol by vacuum distillation, add distilled water to precipitate, filter, wash with n-hexane and methanol in turn, and obtain sulfonate flame retardant. The structural formula is

[0052] (3) Add 6 g of magnesium aluminum hydrotalcite to 600 mL of distilled water, stir and disperse, then add 200 mL of ethanol and 1.8 g of sulfonate flame retardant (prepared according to the method of Example 2), heat to 80°C, condense and reflux and stir for 6 hours, filter, wash with ethanol, and dry to obtain sulfonate flame retardant intercalated modified magnesium aluminum hydrotalcite.

[0053] (4) 100 g of polyvinyl chloride resin, 30 g of plasticizer dioctyl phthalate, 2.6 g of calcium zinc stabilizer, 3.2 g of lubricant stearic acid, and 5 g of sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite are placed in a mixer, mixed at 90° C. for 10 min, and cooled to discharge; then the material is placed in a screw extruder, the screw speed is 80 r / min, the temperatures of zones I to VI are 100° C., 150° C., 165° C., 170° C., 175° C., and 175° C., and after extrusion, it is blown into a film with a blow ratio of 3; cooled and shaped, and the film is pulled and wound for collection, and the pulling speed is 40 m / min to obtain a flame retardant modified PVC film material.

[0054] Thermal stability time test: According to GB / T 2917.1-2002 standard, the Congo red method is used to test the thermal stability time of flame retardant modified PVC film materials, and the heating temperature is 180°C.

[0055] According to GB / T 2406.1-2008 standard, the oxygen index of flame retardant modified PVC film materials is tested. The larger the limiting oxygen index, the better the flame retardancy. According to UL94 standard, the vertical burning grade of flame retardant modified PVC film materials is tested.

[0056] Mechanical properties test of PVC: Taking Example 3 as an example:

[0057] 100g polyvinyl chloride resin, 30g plasticizer dioctyl phthalate, 2.6g calcium zinc stabilizer, 3.2g lubricant stearic acid, 5g sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite were placed in a mixer, mixed at 90℃ for 10min, cooled and discharged; then the material was placed in a screw extruder, the screw speed was 80r / min, the temperature of zones I to VI was 100℃, 150℃, 165℃, 170℃, 175℃, 175℃, after extrusion, it was hot-pressed by a flat vulcanizer at a temperature of 180℃ and a pressure of 10MPa. Then a dumbbell-shaped specimen was made, and the tensile strength of the specimen was tested according to GB / T 1040.1-2018 standard.

[0058] Table 1 Performance test of PVC materials

[0059]

[0060]

[0061] The sulfonate phosphate flame retardant in Example 3-6 contains a disulfonate group, which can undergo ion exchange with magnesium aluminum hydrotalcite, thereby realizing the intercalation modification of magnesium aluminum hydrotalcite by sulfonate phosphate flame retardant, and using it as a composite flame retardant to fill and modify polyvinyl chloride. After the magnesium aluminum hydrotalcite is intercalated with the flame retardant, the di-aliphatic alkyl long chains it contains have a large steric effect, which can reduce the agglomeration of magnesium aluminum hydrotalcite and improve its dispersibility. The compatibility between its aliphatic alkyl long chains and polyvinyl chloride is very good, and it can be chain-entangled with the polyvinyl chloride molecular chain at the same time, so that the magnesium aluminum hydrotalcite and polyvinyl chloride undergo physical cross-linking, which can restrict the movement of the polyvinyl chloride molecular chain, and is conducive to improving the thermal stability and tensile strength of polyvinyl chloride. At the same time, the phosphate flame retardant group contained in the flame retardant has a gas phase and condensed phase flame retardant effect, and plays a synergistic flame retardant effect with the uniformly dispersed magnesium aluminum hydrotalcite, which significantly improves the flame retardant properties of the polyvinyl chloride film material.

[0062] In Comparative Example 1, no sulfonate phosphate flame retardant intercalation modified magnesium aluminum hydrotalcite was added, and the thermal stability time of polyvinyl chloride was low, the flame retardant performance was poor, and the tensile strength was low.

[0063] Comparative Example 2 adds unmodified magnesium aluminum hydrotalcite, which does not contain a fatty alkyl long chain, cannot undergo molecular chain entanglement and physical crosslinking with polyvinyl chloride, has poor compatibility with polyvinyl chloride, is prone to agglomeration, and reduces the tensile strength of polyvinyl chloride. In addition, magnesium aluminum hydrotalcite does not contain a phosphate flame retardant group, and its limiting oxygen index and flame retardant performance are lower than those of the examples.

[0064] Comparative Example 3: Using sulfonate flame retardant precursor and N-ethylmethylamine The sulfonate flame retardant obtained by the reaction does not contain a fatty alkyl long chain. After the magnesium aluminum hydrotalcite is intercalated and modified, it cannot undergo molecular chain entanglement and physical crosslinking with polyvinyl chloride. The magnesium aluminum hydrotalcite has poor compatibility with polyvinyl chloride and is prone to agglomeration. The tensile strength is lower than that of the embodiment.

[0065] Example 7

[0066] The flame retardant modified PVC film material is made into a film with a thickness of 0.080 mm as the flame retardant PVC film bottom layer. The flame retardant modified PVC film material is made into a film with a thickness of 0.100 mm as the flame retardant PVC film surface layer.

[0067] A color pattern layer 2 with a thickness of 0.040 mm is attached to the upper surface of the flame-retardant PVC film bottom layer 3 by printing, and then the flame-retardant PVC film surface layer 1 is attached to the surface of the color pattern layer 2 by high-temperature heating; then the single silicon side of the single silicon double-coated embossed release paper layer 5 (with a thickness of 0.12 mm) is coated on one side of the acrylic pressure-sensitive adhesive layer 4; finally, the other side of the acrylic pressure-sensitive adhesive layer 4 (with a thickness of 0.050 mm) is attached to the lower surface of the flame-retardant PVC film bottom layer 3 to obtain a flame-retardant self-adhesive PVC decorative film.

[0068] Example 8

[0069] The flame retardant modified PVC film material is made into a film with a thickness of 0.100 mm as the flame retardant PVC film bottom layer. The flame retardant modified PVC film material is made into a film with a thickness of 0.080 mm as the flame retardant PVC film surface layer.

[0070] A color pattern layer 2 with a thickness of 0.020 mm is attached to the upper surface of the flame-retardant PVC film bottom layer 3 by a coating method, and then the flame-retardant PVC film surface layer 1 is attached to the surface of the color pattern layer 2 by high-temperature heating; then the single silicon side of the single silicon double-coated embossed release paper layer 5 (with a thickness of 0.15 mm) is coated on one side of the acrylic pressure-sensitive adhesive layer 4; finally, the other side of the acrylic pressure-sensitive adhesive layer 4 (with a thickness of 0.040 mm) is attached to the lower surface of the flame-retardant PVC film bottom layer 3 to obtain a flame-retardant self-adhesive PVC decorative film.

[0071] Example 9

[0072] The flame retardant modified PVC film material is made into a film with a thickness of 0.100 mm as the flame retardant PVC film bottom layer. The flame retardant modified PVC film material is made into a film with a thickness of 0.060 mm as the flame retardant PVC film surface layer.

[0073] A color pattern layer 2 with a thickness of 0.050 mm is attached to the upper surface of the flame-retardant PVC film bottom layer 3 by printing, and then the flame-retardant PVC film surface layer 1 is attached to the surface of the color pattern layer 2 by high-temperature heating; then the single silicon side of the single silicon double-coated embossed release paper layer 5 (with a thickness of 0.12 mm) is coated on one side of the acrylic pressure-sensitive adhesive layer 4; finally, the other side of the acrylic pressure-sensitive adhesive layer 4 (with a thickness of 0.030 mm) is attached to the lower surface of the flame-retardant PVC film bottom layer 3 to obtain a flame-retardant self-adhesive PVC decorative film.

[0074] According to GB / T 2406.1-2008 standard, the oxygen index of flame retardant self-adhesive PVC decorative film is tested. The larger the limiting oxygen index, the better the flame retardancy. According to UL94 standard, the vertical burning grade of flame retardant self-adhesive PVC decorative film is tested.

[0075] Table 2 Flame retardant performance test of flame retardant self-adhesive PVC decorative film

[0076]

[0077] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A flame retardant self-adhesive PVC decorative film, characterized in that: The flame retardant self-adhesive PVC decorative film is a multi-layer composite layer structure, which comprises, from top to bottom, a flame retardant PVC film surface layer (1), a color pattern layer (2), a flame retardant PVC film bottom layer (3), an acrylic pressure-sensitive adhesive layer (4), and a single silicon double-coated embossed release paper layer (5); The flame-retardant PVC film surface layer or the flame-retardant PVC film bottom layer is a flame-retardant modified PVC film material, and the preparation method thereof is as follows: polyvinyl chloride resin, plasticizer, stabilizer, lubricant, sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite are placed in a mixer for hot mixing, and the material is cooled and discharged; then the material is placed in a screw extruder, blown into a film after extrusion, cooled and shaped, and then pulled and wound to obtain the flame-retardant modified PVC film material; The structural formula of the sulfonate phosphate flame retardant is Where n is any integer between 8 and 12.

2. The flame retardant self-adhesive PVC decorative film according to claim 1, characterized in that: The color pattern layer (2) is attached to the upper surface of the flame-retardant PVC film bottom layer (3) by printing or coating; the thickness of the flame-retardant PVC film bottom layer (3) is 0.080-0.100 mm, and the thickness of the color pattern layer (2) is 0.020-0.050 mm.

3. The flame retardant self-adhesive PVC decorative film according to claim 1, characterized in that: The flame-retardant PVC film surface layer (1) is bonded to the surface of the color pattern layer (2) by means of high-temperature thermal bonding; the thickness of the flame-retardant PVC film surface layer (1) is 0.060-0.100 mm.

4. The flame retardant self-adhesive PVC decorative film according to claim 1, characterized in that: The acrylate pressure-sensitive adhesive layer (4) is connected to the single silicon surface of the single silicon double-leaf embossed release paper layer (5) by coating; the thickness of the single silicon double-leaf embossed release paper layer (5) is 0.12-0.15 mm, and the thickness of the acrylate pressure-sensitive adhesive layer (4) is 0.030-0.050 mm.

5. The flame retardant self-adhesive PVC decorative film according to claim 1, characterized in that: The overall thickness of the flame retardant self-adhesive PVC decorative film is 0.300-0.450 mm.

6. The flame retardant self-adhesive PVC decorative film according to claim 1, characterized in that: The mass of the sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite is 5-30% of the mass of the polyvinyl chloride resin.

7. The flame retardant self-adhesive PVC decorative film according to claim 1, characterized in that: The preparation method of the sulfonate phosphate flame retardant intercalation modified magnesium aluminum hydrotalcite is: S1. Add phenyl dichloride phosphate, sodium 3-chloro-2-hydroxypropanesulfonate and triethylamine in a molar ratio of 1:(2.6-3.4):(2.6-3.6) to tetrahydrofuran, stir and react at 30-45° C. for 18-36 hours, distill under reduced pressure, wash and dry to obtain a sulfonate flame retardant precursor; S2, add a sulfonate flame retardant precursor with a molar ratio of 1:(2.4-3) to isopropanol, and the structural formula is N-methyl fatty amine, wherein n is any integer between 8 and 12; stirring to dissolve, adding a sodium hydroxide aqueous solution with a mass fraction of 25-40%, condensing and refluxing at 80-85° C. for 12-18 hours, adding dilute hydrochloric acid to neutralize the solution to pH 7, distilling under reduced pressure, adding distilled water to precipitate, filtering, washing, and drying to obtain a sulfonate phosphate flame retardant; S3. Add magnesium aluminum hydrotalcite to distilled water, stir and disperse, then add ethanol and sulfonate phosphate flame retardant, heat to 75-80°C, condense and reflux and stir for 6-12h, filter, wash and dry to obtain sulfonate phosphate flame retardant intercalated modified magnesium aluminum hydrotalcite.

8. The flame retardant self-adhesive PVC decorative film according to claim 7, characterized in that: The mass of the sulfonate phosphate flame retardant in S3 is 30-150% of the mass of the magnesium aluminum hydrotalcite.

9. The flame retardant self-adhesive PVC decorative film according to claim 1, characterized in that: The temperature of the hot mixing is 80-100°C, and the time is 10-15min; the speed of the screw extruder is 50-80r / min, and the temperature of zones I to VI is 100-175°C; the blow ratio during blow molding is 3-4, and the speed during traction is 40-60m / min.

10. A method for preparing the flame-retardant self-adhesive PVC decorative film according to any one of claims 1 to 9, characterized in that: The color pattern layer (2) is attached to the upper surface of the flame-retardant PVC film bottom layer (3) by printing or coating, and then the flame-retardant PVC film surface layer (1) is attached to the surface of the color pattern layer (2) by high-temperature heating; then the surface of the single-silicon double-coated embossed release paper layer (5) is coated on one side of the acrylic pressure-sensitive adhesive layer (4); finally, the other side of the acrylic pressure-sensitive adhesive layer (4) is attached to the lower surface of the flame-retardant PVC film bottom layer (3), so as to obtain a flame-retardant self-adhesive PVC decorative film.

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