A kind of antimony-free flame-retardant PVC composite material and its preparation method and application

Abstract

This invention discloses an antimony-free flame-retardant PVC composite material, its preparation method, and its application. By weight, the antimony-free flame-retardant PVC composite material comprises the following components: 100 parts of mixed resin, 2-8 parts of stabilizer, 28-48 parts of plasticizer, 4-12 parts of liquid flame-retardant plasticizer, 8-16 parts of aluminum hydroxide, and 4-10 parts of smoke suppressant. The mixed resin includes PVC resin and CPVC resin; wherein, CPVC resin accounts for 30-70% of the mass percentage of the mixed resin; the K value of the CPVC resin is 50-55; the D50 particle size of the aluminum hydroxide is ≤1000nm; and the plasticizer is a phthalate plasticizer. The antimony-free flame-retardant PVC composite material, while maintaining flame-retardant and smoke-suppressing properties, also reduces the precipitation of plasticizer, thereby improving the migration resistance of the plasticizer in the system.

Description

Technical Field

[0001] This invention belongs to the technical field of plastics, and more specifically, relates to an antimony-free flame-retardant PVC composite material, its preparation method, and its application. Background Technology

[0002] Polyvinyl chloride (PVC) has become the core base material for modern decorative fabrics (such as curtains, wall coverings, and sofa fabrics) due to its excellent flame retardancy, plasticity, weather resistance, and cost-effectiveness. In architectural fabrics, considering the fire safety performance of the materials, special attention is paid to the flame retardancy performance. According to GB 8624, B1-level fabric materials are required to have a limiting oxygen index (LOI) ≥ 32%.

[0003] The high chlorine content (56.8%) in PVC gives it an extremely high LOI (48%). However, a large amount of plasticizer needs to be added to architectural fabrics to achieve a soft and comfortable texture. The addition of plasticizers dilutes and reduces the chlorine content of the system. At the same time, common plasticizers (phthalates, parabens, fatty acid diesters, etc.) are all flammable chemicals. This means that plasticized PVC needs to be modified to meet the flame retardant requirements of architectural fabrics. Currently, the flame-retardant plasticized PVC commonly found on the market relies on a halogen-antimony synergistic system (usually antimony trioxide + PVC's own chlorine). It achieves high flame retardancy by efficiently capturing free radicals through the generation of volatile antimony-chlorine compounds during combustion, thereby interrupting the combustion reaction. However, this system has three significant drawbacks: 1. Insufficient smoke suppression: Antimony-based flame retardants exacerbate smoke release during combustion; 2. High cost: Antimony is a scarce strategic heavy metal; 3. Environmental and health risks: Antimony is classified as a Group 2B potential carcinogen by the International Agency for Research on Cancer, and the EU REACH regulation has listed antimony compounds as Substances of Very High Concern (SVHC). Therefore, antimony-free production is an important future development direction for PVC flame retardants.

[0004] Currently, most antimony-free flame retardant applications of PVC focus on adjusting the flame retardant system. Patent publication number CN112677595A discloses a micro-antimony soft B1-grade flame-retardant decorative material, achieving B1-grade flame retardancy by using a high proportion of liquid flame-retardant plasticizer DPK and solid flame retardant aluminum hydroxide. However, the plasticizer and liquid flame-retardant plasticizer DPK in the system exhibit migration and precipitation problems, leading to sticky and dirty product surfaces, and even more seriously, powdering and cracking of the parts. Therefore, providing an antimony-free PVC material with excellent flame retardant properties, low smoke density, and low plasticizer precipitation has become an urgent technical problem to be solved. Summary of the Invention

[0005] To address the aforementioned technical problems, the primary objective of this invention is to provide an antimony-free flame-retardant PVC composite material. This antimony-free flame-retardant PVC composite material, while maintaining flame-retardant and smoke-suppressing properties, also reduces plasticizer exudation, thereby improving the plasticizer's migration resistance within the system.

[0006] The second objective of this invention is to provide a method for preparing antimony-free flame-retardant PVC composite materials.

[0007] The third objective of this invention is to provide an application of antimony-free flame-retardant PVC composite material in the field of building decoration.

[0008] The fourth objective of this invention is to provide an architectural decorative fabric.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solution: This invention claims protection for an antimony-free flame-retardant PVC composite material, which, by weight, comprises the following components: 100 parts of mixed resin, 2-8 parts of stabilizer, 28-48 parts of plasticizer, 4-12 parts of liquid flame-retardant plasticizer, 8-16 parts of aluminum hydroxide, and 4-10 parts of smoke suppressant. The mixed resin includes PVC resin and CPVC resin; wherein, the CPVC resin accounts for 30-70% of the mass percentage of the mixed resin. The K value of the CPVC resin is 50-55; The D50 particle size of the aluminum hydroxide is ≤1000nm; The plasticizer is a phthalate plasticizer.

[0010] The mixed resin used in this invention is PVC resin and CPVC resin. Compared with PVC resin, CPVC resin has a higher chlorine content, which can give PVC composite materials better flame retardant properties and smoke suppression effect. In addition, by utilizing the characteristics of CPVC resin, the damage of plasticizer to flame retardant properties can be reduced, and the use of liquid flame retardant plasticizers can be reduced.

[0011] Furthermore, the inventors discovered through research that directly using a mixed resin system of PVC resin and CPVC resin cannot achieve the desired technical effect, with the mass percentage of CPVC resin in the mixed resin being particularly crucial. When the mass percentage of CPVC resin in the mixed resin is 30-70%, the resin mixture formed by CPVC resin and PVC resin has better compatibility with other components in the system, achieving better plasticization while reducing the risk of plasticizer (especially liquid flame-retardant plasticizer) leaching. The resulting PVC composite material exhibits significantly improved flame retardancy and processability. On the other hand, when the proportion of CPVC resin in the system is higher, due to the characteristics of CPVC resin, it is difficult to plasticize, and plasticizer (especially liquid flame-retardant plasticizer) easily leaches out. Furthermore, this invention uses phthalate plasticizers to complement the system, as phthalate plasticizers exhibit better migration resistance in this PVC / CPVC system.

[0012] Furthermore, since CPVC resin itself has difficulty absorbing plasticizers, it needs to be mixed with PVC resin to form a system before it can absorb plasticizers well. The inventors discovered through research that the lower the K value of CPVC resin, the less entanglement it has, and the easier it is to mix with PVC resin, thereby better absorbing plasticizers and improving the plasticizer migration resistance of the system.

[0013] Furthermore, the aluminum hydroxide in this invention has an extremely low D50 particle size, which allows it to be better dispersed uniformly in the system, forming a dense oxide protective layer that blocks the transfer of oxygen and heat to the interior, thereby increasing the limiting oxygen index and reducing smoke density. In addition, the extremely low D50 particle size of aluminum hydroxide can improve the interfacial compatibility with PVC / CPVC, making it easier to form physical or chemical bonds with mixed resins, reducing interfacial voids, reducing the migration channels of plasticizers / liquid flame retardant plasticizers, and thus improving the plasticizer migration resistance in the system.

[0014] Specifically, the number of parts of CPVC resin can be 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 65 parts, 70 parts, etc., or any range formed by the above values, such as 30-50 parts, 45-65 parts, etc., and the present invention is not limited thereto. Specifically, the number of parts of PVC resin can be 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, 65 parts, 70 parts, etc., or any range formed by the above values, such as 30-50 parts, 45-65 parts, etc., and the present invention is not limited thereto. Specifically, the number of parts of stabilizer can be 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, etc., or any range formed by the above values, and the present invention is not limited thereto. Specifically, the amount of plasticizer can be 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts, 48 ​​parts, etc., or any range formed by the above values; the present invention is not limited thereto. Specifically, the amount of liquid flame-retardant plasticizer can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, etc., or any range formed by the above values; the present invention is not limited thereto. Specifically, the amount of aluminum hydroxide can be 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, etc., or any range formed by the above values; the present invention is not limited thereto. Specifically, the amount of smoke suppressant can be 4.5 parts, 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, 9.5 parts, etc., or any range formed by the above values; the present invention is not limited thereto.

[0015] Specifically, the mass percentage of CPVC resin in the mixed resin can be 35%, 40%, 45%, 50%, 55%, 65%, 70%, etc., or any range formed by the above values, such as 30-50%, 45-65%, etc., and the present invention is not limited thereto.

[0016] Specifically, the PVC resin accounts for no less than 16.3% of the mass of the antimony-free flame-retardant PVC composite material; more specifically, no less than 17.1%. Specifically, the CPVC resin accounts for no less than 16.3% of the mass of the antimony-free flame-retardant PVC composite material; more specifically, no less than 17.1%.

[0017] Specifically, the K-value of the CPVC resin is a relative viscosity measurement based on a dilute resin solution of a specific concentration, which essentially reflects the length of the polymer molecular chain. Specifically, the test method for the K-value of the CPVC resin is GB / T3401-2007, using cyclohexanone as the solvent.

[0018] Preferably, the D50 particle size of the aluminum hydroxide is 500-800 nm. More specifically, the D50 particle size of the aluminum hydroxide is 750-800 nm. Specifically, the D50 particle size of the aluminum hydroxide can be 20 nm, 50 nm, 100 nm, 200 nm, 400 nm, 500 nm, 550 nm, 600 nm, 650 nm, 700 nm, 750 nm, 850 nm, 950 nm, etc., or any range formed by the above values; the present invention is not limited thereto. Specifically, the test method for the particle size of the aluminum hydroxide is GB / T 19077.1-2016.

[0019] Preferably, the plasticizer is selected from at least one of dioctyl terephthalate, dibutyl phthalate, and didecyl phthalate.

[0020] Preferably, the liquid flame-retardant plasticizer is selected from at least one of tricresyl phosphate and tris(butoxyethyl) phosphate. More preferably, the liquid flame-retardant plasticizer is selected from tricresyl phosphate. Under this preferred embodiment, the antimony-free flame-retardant PVC composite material exhibits better flame-retardant properties, smoke suppression properties, and plasticizer migration resistance.

[0021] Preferably, the smoke suppressant is selected from at least one of zinc molybdate, zinc borate, and magnesium hydroxide; and / or the stabilizer is selected from at least one of organotin stabilizers, calcium-zinc stabilizers, and barium-zinc stabilizers.

[0022] Preferably, the K value of the PVC resin is 60-77; and / or the chlorine content of the CPVC resin is 61-68%.

[0023] Preferably, the K value of the PVC resin is 66-68. Specifically, the test method for the K value of the PVC resin is GB / T3401-2007, and the solvent is cyclohexanone.

[0024] Preferably, when the K value of PVC resin / K value of CPVC resin is ≥12, the absorption effect of plasticizer is better.

[0025] Specifically, the test method for the chlorine content of the CPVC resin is GB / T7139-2023, using method A.

[0026] Preferably, the antimony-free flame-retardant PVC composite material further includes at least one of a filler and a light stabilizer.

[0027] Preferably, the filler is selected from at least one of calcium carbonate, talc, silica, zeolite, titanium dioxide, and montmorillonite.

[0028] Preferably, the light stabilizer is selected from at least one of ultraviolet absorbers and hindered amine light stabilizers.

[0029] Specifically, the number of parts of the filler can be 0 parts, 5 parts, 10 parts, 15 parts, 20 parts, etc., or any range formed by the above values, and the present invention is not limited thereto. Specifically, the number of parts of the light stabilizer can be 0 parts, 0.35 parts, 0.38 parts, 0.45 parts, 0.48 parts, etc., or any range formed by the above values, and the present invention is not limited thereto.

[0030] Preferably, the average particle size of the filler is 0.5-3 μm. More preferably, the average particle size of the filler is 1-1.5 μm. Specifically, the average particle size of the filler can be 0.8 μm, 1.2 μm, 1.5 μm, 1.8 μm, 2.0 μm, 2.3 μm, 2.5 μm, 2.8 μm, etc., or any range formed by the above values, such as 0.5-2 μm, 1-3 μm, 1-2 μm, etc., and the present invention is not limited thereto.

[0031] Preferably, the antimony content in the antimony-free flame-retardant PVC composite material is less than 200 ppm. More specifically, the test method for the antimony content in the antimony-free flame-retardant PVC composite material is IEC 62321-5:2013.

[0032] Furthermore, this invention claims protection for a method for preparing an antimony-free flame-retardant PVC composite material, wherein the raw materials are mixed evenly, melt-extruded, and the antimony-free flame-retardant PVC composite material is obtained.

[0033] Preferably, in some embodiments, the preparation method of the antimony-free flame-retardant PVC composite material includes the following steps: mixing PVC resin, a portion of plasticizer and liquid flame-retardant plasticizer, and other raw materials in the system to obtain a PVC resin mixture; mixing CPVC resin, a portion of plasticizer and liquid flame-retardant plasticizer, and other raw materials in the system to obtain a CPVC resin mixture; subsequently, mixing the PVC resin mixture and the CPVC resin mixture uniformly, and melt-extruding to prepare the antimony-free flame-retardant PVC composite material. Forming a separate resin mixture with PVC resin (or CPVC resin) and plasticizer and liquid flame-retardant plasticizer allows the matrix resin to better absorb the plasticizer, improving the plasticizer migration resistance in the system.

[0034] Preferably, a twin-screw extruder is used for melt extrusion, and the length-to-diameter ratio of the twin-screw extruder is 28-40:1. Preferably, the melt extrusion temperature is 190-205°C.

[0035] Furthermore, this invention seeks protection for the application of an antimony-free flame-retardant PVC composite material in the field of building decoration.

[0036] Furthermore, this invention claims protection for an architectural decorative fabric prepared using the aforementioned antimony-free flame-retardant PVC composite material.

[0037] More specifically, architectural decorative fabrics include, but are not limited to, curtains, wall coverings, screens, and sofa fabrics.

[0038] Compared with the prior art, the present invention has the following beneficial effects: This invention provides an antimony-free flame-retardant PVC composite material. By using PVC resin with a specific K value, controlling the mass ratio of CPVC resin in the mixed resin, and combining it with aluminum hydroxide with a specific D50 particle size and a specific type of plasticizer, the flame-retardant properties, smoke suppression properties, and plasticizer migration resistance of the antimony-free flame-retardant PVC composite material are greatly improved. Detailed Implementation

[0039] The present invention will be further described below with reference to the specification and specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in this technical field.

[0040] PVC resin, K-value 66-68, PVC S-65, Formosa Plastics Industrial (Ningbo) Co., Ltd. The K-value of the PVC resin was tested twice according to GB / T3401-2007, and the results of the two tests were used as the upper and lower limits of the K-value.

[0041] CPVC resin 1, K value 51-54, CPVC H716S, MITSUI&CO. PLASTICS LTD. The K value of CPVC resin was tested twice according to GB / T3401-2007, and the results of the two tests were used as the upper and lower limits of the K value.

[0042] CPVC resin 2, K value 60-63, CPVC J-700, Shandong Gaoxin Chemical Co., Ltd.

[0043] Stabilizer, calcium-zinc stabilizer, TS-828, Shenzhen Xinglv Technology Co., Ltd.

[0044] Plasticizer 1, Didecyl Phthalate (DPHP), Guangzhou Weilianda Plasticizer Co., Ltd.

[0045] Plasticizer 2, dioctyl oxalate, DOA, Shanghai Kaiqun Trading Co., Ltd. Dongguan Branch.

[0046] Liquid flame retardant plasticizer 1, tricresyl phosphate, WSFR-TCP, Zhejiang Wansheng Co., Ltd.

[0047] Liquid flame retardant plasticizer 2, tri(butoxyethyl) phosphate, Zhejiang Wansheng Co., Ltd.

[0048] Liquid flame retardant plasticizer 3, toluene diphenyl phosphate, Disflamoll DPK, Lanxess Chemicals.

[0049] Aluminum hydroxide 1, D50 particle size 800nm, Hydrol® Coat 8, JM Huber Corporation.

[0050] Aluminum hydroxide 2, D50 particle size 750nm, AH-01DG, Luoyang Zhongchao New Material Co., Ltd.

[0051] Aluminum hydroxide 3, D50 particle size 2.1μm, AH-01DH, Luoyang Zhongchao New Material Co., Ltd.

[0052] Smoke suppressant 1, zinc borate, with an average particle size of 5μm, HT-207, Jinan Taixing Fine Chemical Co., Ltd.

[0053] Smoke suppressant 2, magnesium hydroxide, average particle size 1.5μm, Aitemag 12, Jiangsu Aitemag Flame Retardant Materials Co., Ltd.

[0054] Filler, calcium carbonate, average particle size 1.2μm, LX-103, Lixin Plastics Co., Ltd.

[0055] Light stabilizer, ultraviolet light absorber, RIASORB UV-326, Lianlong New Materials Co., Ltd.

[0056] Antimony white, antimony trioxide, average particle size 0.7μm, S-05N, Changde Chenzhou Antimony Products Co., Ltd.

[0057] Unless otherwise specified, all components (such as antioxidants and lubricants) used in the parallel embodiments and comparative examples are the same commercially available products.

[0058] Examples 1-9 An antimony-free flame-retardant PVC composite material is prepared by the following steps: according to the weight parts described in Table 1, each raw material in the system is placed in a high-speed mixer for low-speed (600 rpm) mixing, followed by high-speed (1200 rpm) mixing. When the material in the high-speed mixer reaches 120°C, it is discharged into a cold cylinder (room temperature) for continued low-speed (400 rpm) mixing. The mixture is then extruded and granulated at 195°C using a two-stage extruder (length-to-diameter ratio 28:1) to obtain the antimony-free flame-retardant PVC composite material.

[0059] The difference between Example 9 and Example 1 is as follows: According to the weight parts described in Table 1, PVC resin, aluminum hydroxide, smoke suppressant, 1 / 2 part by weight of stabilizer and other added additives (such as fillers and light stabilizers) are placed in high-speed mixer #1 and mixed at low speed (600 rpm). Then, 1 / 2 part by weight of plasticizer and 1 / 2 part by weight of liquid flame retardant plasticizer are added and mixed at high speed (1200 rpm) until the material in the high-speed mixer reaches 120°C. In high-speed mixer #2, CPVC resin, 1 / 2 part by weight of stabilizer, 1 / 2 part by weight of plasticizer and 1 / 2 part by weight of liquid flame retardant plasticizer are added and mixed at low speed (600 rpm) first, and then at high speed (1200 rpm) until the material temperature reaches 120°C. The materials from the No. 1 and No. 2 high-speed mixers were then placed into a cold cylinder (room temperature) and mixed at a low speed (400 rpm). The mixture was then extruded and granulated at 195°C using a two-stage extruder (length-to-diameter ratio 28:1) to obtain antimony-free flame-retardant PVC composite material.

[0060] Table 1

[0061] Antimony was not detected in the antimony-free flame-retardant PVC composite materials prepared in Examples 1-9 (antimony element test method: inductively coupled plasma atomic emission spectrometry (ICP), test standard: IEC 62321-5:2013).

[0062] Comparative Examples 1-10 The weight proportions of raw materials used in the following comparative examples are shown in Table 2. The preparation method is the same as that in Example 1 above.

[0063] Table 2

[0064] Test case The antimony-free flame-retardant PVC composite materials obtained in the above embodiments and comparative examples were subjected to relevant experimental tests. The specific test items and test methods are as follows: (1) Limiting oxygen index (%): Tested according to GB / T 2406.2-2009 "Oxygen index method for testing the combustion behavior of plastics - Part 2: Room temperature test". B1 grade: limiting oxygen index ≥ 32%, B2 grade: 26% ≤ limiting oxygen index < 32%.

[0065] (2) Maximum smoke density (with flame): Tested in accordance with GB / T 8323.3-2008 Plastic smoke generation - Part 3: Optical density method test.

[0066] (3) Plasticizer mass loss rate (%): The test was conducted in accordance with HG / T 4458-2012 "Determination of plasticizer loss in plastics, activated carbon method".

[0067] The test results are shown in Table 3 below.

[0068] Table 3

[0069] As shown in Table 3 above, the antimony-free flame-retardant PVC composite material provided by this invention has a high limiting oxygen index, all reaching B1 level; it has a low maximum smoke density, demonstrating the excellent smoke suppression performance of the antimony-free flame-retardant PVC composite material; and it has a low plasticizer mass loss rate, demonstrating the excellent plasticizer migration resistance of the system. More specifically, the antimony-free flame-retardant PVC composite material provided by this invention has a limiting oxygen index ≥32.5%, a maximum smoke density ≤354, and a plasticizer mass loss rate ≤0.80%.

[0070] As can be seen from Examples 1 and 6, compared with tri(butoxyethyl) phosphate, using tricresyl phosphate as a liquid flame retardant plasticizer, the PVC composite material has a higher limiting oxygen index, a lower maximum smoke density, and a lower plasticizer loss.

[0071] As can be seen from Examples 1 and 9, mixing CPVC resin or PVC resin with plasticizer and liquid flame retardant plasticizer, and then blending the CPVC resin mixture and PVC resin mixture together, can enable the matrix resin to better absorb the plasticizer and improve the plasticizer migration resistance of the system.

[0072] As can be seen from Example 1 and Comparative Example 1, the technical effects of the present invention cannot be achieved when the system does not contain liquid flame retardant plasticizer, aluminum hydroxide and smoke suppressant.

[0073] As can be seen from Example 1 and Comparative Example 2, the antimony-free flame-retardant PVC composite material provided by the present invention has a higher limiting oxygen index and a lower maximum smoke density compared with the conventional flame-retardant antimony system used in the art.

[0074] As can be seen from Examples 1 and Comparative Examples 3-5, it is difficult to achieve the technical effects of the present invention when PVC resin is used alone, CPVC resin is used alone, or the ratio of PVC resin and CPVC resin is not within a specific range.

[0075] As can be seen from Example 1 and Comparative Example 6, when the liquid flame retardant plasticizer is in excess, it will migrate and precipitate in large quantities in the system.

[0076] As can be seen from Example 1 and Comparative Example 7, when using CPVC resin with a high K value, the plasticizer in the PVC composite material prepared will migrate and precipitate in large quantities.

[0077] As can be seen from Example 1 and Comparative Example 8, the PVC composite material prepared by using diphenyl toluene phosphate (DPK) as the liquid flame retardant plasticizer not only has a low limiting oxygen index and a high maximum smoke density, but also has poor plasticizer migration resistance.

[0078] As can be seen from Example 1 and Comparative Example 9, using aluminum hydroxide with a specific D50 particle size, the PVC composite material has a higher limiting oxygen index, a lower maximum smoke density, and a lower plasticizer loss.

[0079] As can be seen from Example 1 and Comparative Example 10, the PVC composite material prepared using didecyl phthalate plasticizer has a higher limiting oxygen index, a lower maximum smoke density, and a lower plasticizer loss.

[0080] The foregoing examples are merely illustrative, used to explain some features of the method described in this invention. The appended claims are intended to claim the broadest possible scope, and the embodiments presented herein are demonstrated by the applicant's actual experimental results. Therefore, the applicant intends that the appended claims are not limited by the selection of examples illustrating the features of the invention. Some numerical ranges used in the claims also include sub-ranges within them, and variations within these ranges should also be interpreted as being covered by the appended claims where possible.

Claims

1. An antimony-free flame-retardant PVC composite material, characterized in that, The product comprises the following components by weight: 100 parts of mixed resin, 2-8 parts of stabilizer, 28-48 parts of plasticizer, 4-12 parts of liquid flame retardant plasticizer, 8-16 parts of aluminum hydroxide, and 4-10 parts of smoke suppressant. The mixed resin includes PVC resin and CPVC resin; wherein, the CPVC resin accounts for 30-70% of the mass percentage of the mixed resin. The K value of the CPVC resin is 50-55; The D50 particle size of the aluminum hydroxide is ≤1000nm; The plasticizer is a phthalate plasticizer.

2. The antimony-free flame-retardant PVC composite material according to claim 1, characterized in that, The plasticizer is selected from at least one of dioctyl terephthalate, dibutyl phthalate, and didecyl phthalate.

3. The antimony-free flame-retardant PVC composite material according to claim 1, characterized in that, The liquid flame retardant plasticizer is selected from at least one of tricresyl phosphate and tri(butoxyethyl) phosphate; Preferably, the liquid flame retardant plasticizer is selected from tricresyl phosphate.

4. The antimony-free flame-retardant PVC composite material according to claim 1, characterized in that, The smoke suppressant is selected from at least one of zinc molybdate, zinc borate, and magnesium hydroxide; and / or The stabilizer is selected from at least one of organotin stabilizers, calcium-zinc stabilizers, and barium-zinc stabilizers.

5. The antimony-free flame-retardant PVC composite material according to claim 1, characterized in that, The K value of the PVC resin is 60-77; and / or The chlorine content of the CPVC resin is 61-68%.

6. The antimony-free flame-retardant PVC composite material according to claim 1, characterized in that, The D50 particle size of the aluminum hydroxide is 500-800 nm.

7. The antimony-free flame-retardant PVC composite material according to claim 1, characterized in that, The antimony-free flame-retardant PVC composite material also includes at least one of fillers and light stabilizers; Preferably, the filler is selected from at least one of calcium carbonate, talc, silica, zeolite, titanium dioxide, and montmorillonite; Preferably, the light stabilizer is selected from at least one of ultraviolet absorbers and hindered amine light stabilizers.

8. The method for preparing the antimony-free flame-retardant PVC composite material according to any one of claims 1-7, characterized in that, The raw materials are mixed evenly, melt-extruded, and the antimony-free flame-retardant PVC composite material is prepared.

9. The application of the antimony-free flame-retardant PVC composite material according to any one of claims 1-7 in the field of building decoration.

10. An architectural decorative fabric, characterized in that, It is prepared using the antimony-free flame-retardant PVC composite material described in any one of claims 1-7.

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