Anti-seepage high-extension PVC coiled material for swimming pool and preparation method of anti-seepage high-extension PVC coiled material

Abstract

The invention belongs to the technical field of PVC coiled materials, and particularly relates to an anti-seepage high-extension PVC coiled material for a swimming pool and a preparation method of the anti-seepage high-extension PVC coiled material. The anti-seepage high-extension PVC coiled material for the swimming pool is prepared from the following components in parts by weight: 100 parts of PVC resin, 23 to 27 parts of plasticizer, 15 to 20 parts of ethylene-vinyl acetate-carbon monoxide terpolymer, 1 to 3 parts of stabilizer, 1 to 2 parts of antioxidant, 1 to 2 parts of calcium stearate, 1 to 1.5 parts of chlorinated paraffin, 0.2 to 0.6 part of epoxidized soybean oil and 30 to 35 parts of modified light calcium carbonate. The PVC coiled material prepared by the invention is high in tensile property, tearing strength and waterproof performance, and excellent in low temperature resistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of PVC coils, and particularly relates to a high-ductility PVC coil for pool anti-seepage and its preparation method. Background Art

[0002] The coil for pool is a waterproof material specially designed for laying inside swimming pools. With the improvement of the performance requirements of waterproof materials for pool projects, polyvinyl chloride (PVC) coils have gradually become the mainstream choice due to their excellent anti-seepage property, chemical corrosion resistance, and construction convenience.

[0003] In practical applications, there are still significant technical bottlenecks in the ductility and low-temperature bending resistance of traditional PVC coils. Since the pool structure may undergo small displacements or cracks due to factors such as foundation settlement and temperature changes, these changes pose a severe test to the waterproof layer. Ordinary waterproof materials may rupture due to lack of sufficient ductility, resulting in waterproof failure. In addition, in cold regions or during seasonal alternation, the temperature around the pool fluctuates greatly. Traditional PVC coils are prone to becoming brittle in low-temperature environments and may develop cracks or even break when bent, affecting the waterproof effect.

[0004] Chinese Patent with Publication No. CN 118620336A discloses a composition for polyvinyl chloride waterproof coil, a polyvinyl chloride waterproof coil, its preparation method and application. The polyvinyl chloride waterproof coil not only has strong tensile strength and elongation rate, but also has good waterproof function while being able to insulate and keep warm. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-ductility PVC coil for pool anti-seepage and its preparation method.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A high-ductility PVC coil for pool anti-seepage, comprising the following components in parts by weight: 100 parts of PVC resin, 23 - 27 parts of plasticizer, 15 - 20 parts of ethylene-vinyl acetate-carbon monoxide terpolymer, 1 - 3 parts of stabilizer, 1 - 2 parts of antioxidant, 1 - 2 parts of calcium stearate, 1 - 1.5 parts of chlorinated paraffin, 0.2 - 0.6 parts of epoxidized soybean oil, and 30 - 35 parts of modified light calcium carbonate.

[0007] Preferably, the preparation method of the modified light calcium carbonate comprises the following steps: (1) Pre-modify light calcium carbonate with a silane coupling agent to obtain pre-modified light calcium carbonate; (2) Graft polymethyl methacrylate onto the surface of the pre-modified light calcium carbonate to obtain modified light calcium carbonate.

[0008] Preferably, the preparation method of the modified light calcium carbonate comprises the following steps: (1) Add light calcium carbonate into an ethanol aqueous solution, add a silane coupling agent, under nitrogen protection, heat up to 60-65 °C, react for 7-10 h, centrifuge, wash, and dry to obtain pre-modified light calcium carbonate; (2) Disperse the pre-modified light calcium carbonate in ethanol, add methyl methacrylate and azobisisobutyronitrile, heat up to 65-70 °C under a nitrogen atmosphere, keep the temperature constant and react for 8-10 h. After the reaction, centrifuge, wash, and dry to obtain modified light calcium carbonate.

[0009] By modifying the light calcium carbonate, the present invention can improve the tear strength of the coil. The analysis is that after the light calcium carbonate is grafted with polymethyl methacrylate, the ester groups on the modified light calcium carbonate produce a dipole interaction with -Cl of PVC, regulating the interfacial interaction strength, and thus improving the tear strength of the coil.

[0010] Preferably, the silane coupling agent is selected from at least one of silane coupling agent KH550 and silane coupling agent KH570.

[0011] Preferably, the melt flow index of the ethylene-vinyl acetate-carbon monoxide terpolymer under the conditions of 190 °C and 2.16 kg is 30-35 g / 10 min, the melting point is 60-66 °C, and the density is 0.95-1.0 g / cm 3 .

[0012] Preferably, the melt flow index (190 °C / 2.16 kg) of the ethylene-vinyl acetate-carbon monoxide terpolymer is 35 g / 10 min, the melting point is 66 °C, and the density is 1.0 g / cm 3 .

[0013] The ethylene-vinyl acetate-carbon monoxide terpolymer can be obtained commercially or prepared by conventional methods. Commercially available ones can be the ethylene-vinyl acetate-carbon monoxide terpolymer with the model of ELVALOY TM 741 from The Dow Chemical Company in the United States.

[0014] By using the ethylene-vinyl acetate-carbon monoxide terpolymer with the model of ELVALOY TM 741, the present invention can improve the tensile strength, elongation at break and low temperature resistance of the coil. The present invention selects the melting point of the ethylene-vinyl acetate-carbon monoxide terpolymer to make the copolymer have better thermal stability. When compounded with PVC during the processing, it can endow the PVC coil with better dimensional stability and temperature resistance stability, and thus affect the performance of the final product.

[0015] Preferably, the plasticizer includes a polyester plasticizer, and the plasticizer further includes at least one of a synthetic plant ester plasticizer and trioctyl trimellitate.

[0016] Preferably, the plasticizer includes a polyester plasticizer, a synthetic plant ester plasticizer, and trioctyl trimellitate.

[0017] Preferably, the plasticizer includes a polyester plasticizer, a synthetic plant ester plasticizer, and trioctyl trimellitate in a weight ratio of (1.4 - 1.6):(0.2 - 0.4):(0.6 - 0.9).

[0018] The polyester plasticizer, the synthetic plant ester plasticizer, and trioctyl trimellitate can be commercially available or prepared by conventional methods. The commercially available one can be the polyester plasticizer of model TD - 1720 (DIC Investment Co., Ltd., GLOBINEX). The model of the synthetic plant ester plasticizer: environmental protection plasticizer T60 (Jiangsu Sendi Chemical Technology Co., Ltd., superior grade). Trioctyl trimellitate, Jiangsu Sendi Chemical Technology Co., Ltd., trioctyl trimellitate TOTM (superior grade).

[0019] By adding a compound plasticizer with a specific ratio, the present invention can improve the low - temperature resistance of the coil material. By selecting a polyester plasticizer, a synthetic plant ester plasticizer, and trioctyl trimellitate for compounding, when these three plasticizers are used in a certain proportion, they can produce a synergistic effect, make up for each other's deficiencies, and play a role of synergistic enhancement. In a low - temperature environment, by adjusting the proportion of the plasticizer, the interaction between PVC molecular chains can be optimized, and sufficient molecular fluidity can still be maintained at a lower temperature, reducing the hardening phenomenon caused by temperature reduction and improving the anti - bending ability of the PVC material.

[0020] Preferably, the antioxidant is selected from at least one of antioxidant 1010, antioxidant 1076, and antioxidant 1098.

[0021] The preparation method of the anti - seepage and highly extensible PVC coil for swimming pools includes the following steps: adding the components into a mixer and stirring and blending them evenly, extruding with a twin - screw extruder, feeding into a three - roll calender for cooling and shaping, performing radiation cross - linking, and finally pulling to a coiler for coiling to obtain the anti - seepage and highly extensible PVC coil for swimming pools.

[0022] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: 1. The coil material prepared by the present invention is applicable to various scenarios such as swimming pools, artificial lakes, and water conservancy projects, effectively solving the problems of easy cracking and leakage of traditional coil materials, significantly extending the service life, and providing a safer and more durable material choice for related projects.

[0023] 2. The present invention can improve the low temperature resistance of the coiled material by adding a compound plasticizer in a specific ratio.

[0024] 3. The present invention can improve the tensile strength and elongation at break of the coil by using ethylene-vinyl acetate-carbon monoxide terpolymer with specific parameters.

[0025] 4. The present invention can improve the tear strength of the coil by modifying the light calcium carbonate. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The raw materials used in the following examples of the present invention are all commercially available products: Epoxidized soybean oil, Jiangsu Sendi Chemical Technology Co., Ltd., epoxidized soybean oil (first grade).

[0028] Chlorinated paraffin, Jiangsu Sendi Chemical Technology Co., Ltd., Chlorinated paraffin-52 (first grade).

[0029] Antioxidant, Tianjin Lianlong New Materials Co., Ltd., Antioxidant 1010.

[0030] Stabilizer, model FZ-801B composite stabilizer, Jiujiang Tiansheng Plastic Additives Co., Ltd.

[0031] PVC resin, Hubei Yihua Chemical Industry Co., Ltd., model SG5.

[0032] Light calcium carbonate, Shanghai Liangjiang Titanium Dioxide Chemical Products Co., Ltd., rubber and plastic grade.

[0033] Example 1 The present embodiment provides an anti-seepage and high-extensibility PVC coil for swimming pools, comprising the following components in parts by weight: 100 parts of PVC resin, 25 parts of plasticizer, 17 parts of ethylene-vinyl acetate-carbon monoxide terpolymer, 2 parts of stabilizer, 1.4 parts of antioxidant, 1.7 parts of calcium stearate, 1.2 parts of chlorinated paraffin, 0.4 parts of epoxidized soybean oil, and 32 parts of modified light calcium carbonate.

[0034] The preparation method of the modified light calcium carbonate comprises the following steps: (1) Add 10 parts by weight of light calcium carbonate to 150 parts by weight of 90 wt% ethanol aqueous solution, ultrasonically disperse for 30 min at a power of 300 W, add 1.5 parts by weight of silane coupling agent KH550, and adjust the pH to 4.5 using glacial acetic acid. Under nitrogen protection, heat up to 62 °C and react for 9 h. Centrifuge, wash twice with ethanol and water in sequence, and dry to obtain pre-modified light calcium carbonate; (2) Disperse 5 parts by weight of pre-modified light calcium carbonate in 100 parts by weight of ethanol, ultrasonically treat for 15 min at a power of 200 W, add 26 parts by weight of methyl methacrylate and 0.26 parts by weight of azobisisobutyronitrile, heat up to 70 °C under a nitrogen atmosphere, and react at a constant temperature for 9 h. After the reaction, centrifuge, wash three times with ethanol and water in sequence, and vacuum dry to obtain modified light calcium carbonate.

[0035] The ethylene-vinyl acetate-carbon monoxide terpolymer has the model ELVALOY TM 741, The Dow Chemical Company, USA. The melt flow index (190 °C / 2.16 kg) of the ethylene-vinyl acetate-carbon monoxide terpolymer is 35 g / 10 min, the melting point is 66 °C, and the density is 1.0 g / cm 3 .

[0036] The plasticizer includes a polyester plasticizer, a synthetic plant ester plasticizer, and trioctyl trimellitate with a weight ratio of 1.5:0.3:0.7. The model of the polyester plasticizer is TD-1720. DIC Investment Co., Ltd., GLOBINEX. The synthetic plant ester plasticizer is from Jiangsu Sendi Chemical Technology Co., Ltd., model: Environmentally Friendly Plasticizer T60 (superior grade). Trioctyl trimellitate is from Jiangsu Sendi Chemical Technology Co., Ltd., trioctyl trimellitate TOTM (superior grade).

[0037] The preparation method of the anti-seepage and highly extensible PVC coil for swimming pools includes the following steps: Add the components to a mixer and stir and blend evenly, then extrude with a twin-screw extruder. The processing temperature of the twin-screw extruder is: zone 1 at 120 °C, zone 2 at 145 °C, zone 3 at 160 °C, zone 4 at 175 °C, zone 5 at 175 °C, zone 6 at 160 °C; Feed it into a three-roll calender for cooling and shaping. The temperature of the three-roll calender is 50 °C, and use an electron accelerator device for radiation crosslinking: the irradiation energy is 2 MeV, the beam current is 12 mA, the irradiation dose is 100 kGy, and draw it to a coiler for coiling to obtain an anti-seepage and highly extensible PVC coil for swimming pools with a thickness of 1.5 mm.

[0038] Example 2 This embodiment provides a high-extension PVC coil for swimming pools, which comprises the following components in parts by weight: 100 parts of PVC resin, 23 parts of plasticizer, 20 parts of ethylene-vinyl acetate-carbon monoxide terpolymer, 1 part of stabilizer, 2 parts of antioxidant, 1 part of calcium stearate, 1.5 parts of chlorinated paraffin, 0.2 part of epoxidized soybean oil, and 35 parts of modified light calcium carbonate.

[0039] The preparation method of the modified light calcium carbonate comprises the following steps: (1) Add 10 parts by weight of light calcium carbonate to 150 parts by weight of 90wt% ethanol aqueous solution, disperse it by ultrasonic wave with a power of 300W for 30min, add 1.5 parts by weight of silane coupling agent KH550, adjust the pH to 5 with glacial acetic acid, heat it to 65°C under nitrogen protection, react for 10h, centrifuge, wash it twice with ethanol and water in sequence, and dry it to obtain pre-modified light calcium carbonate; (2) Disperse 5 parts by weight of pre-modified light calcium carbonate in 100 parts by weight of ethanol, perform ultrasonic treatment with a power of 200W for 15min, add 25 parts by weight of methyl methacrylate and 0.28 parts by weight of azobisisobutyronitrile, heat it to 65°C under nitrogen atmosphere, keep the temperature constant and react for 10h. After the reaction is completed, centrifuge, wash it three times with ethanol and water in sequence, and dry it under vacuum to obtain modified light calcium carbonate.

[0040] The ethylene-vinyl acetate-carbon monoxide terpolymer model is ELVALOY TM 741, The Dow Chemical Company, USA. The melt flow index (190°C / 2.16kg) of the ethylene-vinyl acetate-carbon monoxide terpolymer is 35g / 10 min, the melting point is 66°C, and the density is 1.0g / cm 3 .

[0041] The plasticizer includes polyester plasticizer, synthetic plant ester plasticizer and trioctyl trimellitate with a weight ratio of 1.4:0.2:0.9. The model of the polyester plasticizer is TD-1720. DIC Investment Co., Ltd., GLOBINEX. Synthetic plant ester plasticizer, Jiangsu Sendi Chemical Technology Co., Ltd., model: environmental plasticizer T60 (superior grade). Trioctyl trimellitate, Jiangsu Sendi Chemical Technology Co., Ltd., trioctyl trimellitate TOTM (superior grade).

[0042] The preparation method of the anti-seepage and highly extensible PVC coil for swimming pools includes the following steps: adding components into a mixer for stirring and blending evenly, extruding with a twin-screw extruder, and the processing temperature of the twin-screw extruder is: zone 1 at 120 °C, zone 2 at 145 °C, zone 3 at 160 °C, zone 4 at 175 °C, zone 5 at 175 °C, zone 6 at 160 °C; feeding into a three-roll calender for cooling and shaping, the temperature of the three-roll machine is 50 °C, and using an electron accelerator device for radiation cross-linking: the irradiation energy is 2 MeV, the beam current is 12 mA, the irradiation dose is 100 kGy, and pulling to a coiler for coiling to obtain an anti-seepage and highly extensible PVC coil for swimming pools with a thickness of 1.5 mm.

[0043] Example 3 The difference between this example and Example 1 is that the plasticizer includes a polyester plasticizer and trioctyl trimellitate with a weight ratio of 1.5:0.7. The model of the polyester plasticizer is TD-1720. DIC Investment Co., Ltd., GLOBINEX. Trioctyl trimellitate, Jiangsu Sendi Chemical Technology Co., Ltd., trioctyl trimellitate TOTM (superior grade).

[0044] Example 4 The difference between this example and Example 1 is that the plasticizer includes a polyester plasticizer and a synthetic plant ester plasticizer with a weight ratio of 1.5:0.3. The model of the polyester plasticizer is TD-1720, DIC Investment Co., Ltd., GLOBINEX. Synthetic plant ester plasticizer, Jiangsu Sendi Chemical Technology Co., Ltd., model: environmental plasticizer T60 (superior grade).

[0045] Example 5 The difference between this example and Example 1 is that the plasticizer includes a polyester plasticizer, a synthetic plant ester plasticizer and trioctyl trimellitate with a weight ratio of 1.2:0.9:0.4.

[0046] Comparative Example 1 The difference between this comparative example and Example 1 is that the plasticizer is a polyester plasticizer, a polyester plasticizer of model TD-1720 (DIC Investment Co., Ltd., GLOBINEX).

[0047] Comparative Example 2 The difference between this comparative example and Example 1 is that the ethylene-vinyl acetate-carbon monoxide terpolymer model is ELVALOYTM742, Dow Chemical Company, USA. The melt flow index (190 °C / 2.16 kg) of the ethylene-vinyl acetate-carbon monoxide terpolymer is 35 g / 10 min, the melting point is 45 °C, and the density is 1.02 g / cm 3 。

[0048] Comparative Example 3 The difference between this comparative example and Example 1 is that the modified light calcium carbonate is replaced with light calcium carbonate, Shanghai Liangjiang Titanium Dioxide Chemical Products Co., Ltd., rubber and plastic grade.

[0049] Comparative Example 4 The difference between this comparative example and Example 1 is that an anti-seepage and highly extensible PVC coil for swimming pools comprises the following components in parts by weight: 100 parts of PVC resin, 36 parts of plasticizer, 10 parts of ethylene-vinyl acetate-carbon monoxide terpolymer, 2 parts of stabilizer, 1.4 parts of antioxidant, 1.7 parts of calcium stearate, 1.2 parts of chlorinated paraffin, 0.4 parts of epoxidized soybean oil, and 28 parts of modified light calcium carbonate.

[0050] Comparative Example 5 This comparative example is a waterproof coiled material made of polyvinyl chloride with a thickness of 1.5 mm prepared by the method of Example 1 in the Chinese patent with the publication number CN 118620336 B, a composition for polyvinyl chloride waterproof coiled material, a polyvinyl chloride waterproof coiled material, and a preparation method and application thereof.

[0051] Performance test The anti-seepage and highly extensible PVC coils prepared in Examples 1-5 and Comparative Examples 1-5 were subjected to performance tests.

[0052] Tensile properties, right-angle tear strength, and low-temperature bending property: The tests were carried out with reference to GB12592-2011 "Polyvinyl Chloride Waterproof Coiled Material". The results are shown in Table 1.

[0053] Table 1 Performance test results

[0054] As can be seen from Table 1, the tensile properties and tear strength of the PVC coils prepared in Examples 1-5 are superior to those of the PVC coils of the prior art in Comparative Example 5. After measurement, the waterproof performance of the coils prepared in Examples 1-5 is excellent. The PVC coils of Examples 1-2 have excellent low-temperature resistance.

[0055] In Comparative Example 1, only polyester plasticizer is used, and the low-temperature resistance of the coiled material decreases.

[0056] In Comparative Example 2, the ethylene-vinyl acetate-carbon monoxide terpolymer is replaced with ELVALOY TM 742, the tensile properties of the coiled material decrease, and at the same time, the low-temperature bending property decreases.

[0057] In Comparative Example 3, the light calcium carbonate is not modified, and the tear strength of the coiled material decreases.

[0058] In Comparative Example 4, the ratio of the plasticizer, ethylene-vinyl acetate-carbon monoxide terpolymer, and modified light calcium carbonate is changed, and the mechanical properties and low-temperature resistance of the coiled material decrease, indicating that the three play a synergistic role.

[0059] In summary, the anti-seepage high-extensibility PVC coiled material for swimming pools prepared by the present invention has excellent tensile strength and elongation at break, ensuring that the material is not easily damaged when subjected to external stress, and enhancing the overall stability and durability of the waterproof layer. At the same time, the high elongation at break means that the material has good flexibility and can adapt to small movements or cracks in the infrastructure without breaking, effectively preventing water penetration. This property makes the PVC coiled material not only suitable for waterproofing projects for newly built swimming pools, but also provides an ideal solution for the renovation of old swimming pools, extending the service life of the facilities.

[0060] In cold climates, the temperature around the swimming pool fluctuates greatly, which places higher demands on waterproof materials. The PVC coiled material for swimming pools prepared by the present invention has excellent low temperature resistance, and can maintain good flexibility and anti-bending ability even at extremely low temperatures, avoiding brittle cracking caused by low temperatures. The reliability of the waterproof layer under adverse weather conditions is significantly improved, ensuring its long-term and effective waterproof effect. At the same time, good low temperature resistance also broadens the application scope of PVC coiled materials, making it not only suitable for warm areas, but also able to provide lasting protection in cold environments, meeting the needs of different geographical regions.

[0061] The anti-seepage high-extensibility PVC coil for swimming pools of the present invention has excellent tear resistance. Whether it is accidental scratches during construction or physical damage in daily use, the high-strength tear resistance can effectively resist damage caused by these external forces and reduce the risk of water leakage caused by material damage. The improvement of tear resistance not only improves the safety and stability of the waterproof system, but also reduces maintenance costs because it reduces the need for frequent repairs or replacements. The high-performance PVC coil of the present invention provides consumers with a more reliable, economical and easy-to-maintain waterproof solution, greatly improving the operating efficiency and service life of swimming pool facilities.

[0062] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An anti-seepage and highly extensible PVC coil for swimming pools, characterized in that, Comprising the following components in parts by weight: 100 parts of PVC resin, 23 - 27 parts of plasticizer, 15 - 20 parts of ethylene-vinyl acetate-carbon monoxide terpolymer, 1 - 3 parts of stabilizer, 1 - 2 parts of antioxidant, 1 - 2 parts of calcium stearate, 1 - 1.5 parts of chlorinated paraffin, 0.2 - 0.6 parts of epoxidized soybean oil, 30 - 35 parts of modified light calcium carbonate.

2. The anti-seepage and highly extensible PVC coil for swimming pools according to claim 1, characterized in that, The preparation method of the modified light calcium carbonate comprises the following steps: (1) Pre-modify light calcium carbonate with a silane coupling agent to obtain pre-modified light calcium carbonate; (2) Graft polymethyl methacrylate onto the surface of the pre-modified light calcium carbonate to obtain modified light calcium carbonate.

3. The anti-seepage and highly extensible PVC coil for swimming pools according to claim 2, wherein The preparation method of the modified light calcium carbonate comprises the following steps: (1) Add light calcium carbonate into an ethanol aqueous solution, add a silane coupling agent, under nitrogen protection, heat and react, centrifuge, wash, and dry to obtain pre-modified light calcium carbonate; (2) Disperse the pre-modified light calcium carbonate in ethanol, add methyl methacrylate and azobisisobutyronitrile, in a nitrogen atmosphere, heat to 65 - 70 °C, keep the temperature constant and react for 8 - 10 h, after the reaction ends, centrifuge, wash, and dry to obtain modified light calcium carbonate.

4. The anti-seepage and highly extensible PVC coil for swimming pools according to claim 3, characterized in that, The silane coupling agent is selected from at least one of silane coupling agent KH550 and silane coupling agent KH570.

5. The anti-seepage and highly extensible PVC coil for swimming pools according to claim 1, characterized in that, The melt flow index of ethylene-vinyl acetate-carbon monoxide terpolymer under the conditions of 190 °C and 2.16 kg is 30-35 g / 10 min, the melting point is 60-66 °C, and the density is 0.95-1.0 g / cm 3 .

6. The anti-seepage and highly extensible PVC coil for swimming pools according to claim 1, wherein The plasticizer includes a polyester plasticizer, and the plasticizer further includes at least one of a synthetic plant ester plasticizer and trioctyl trimellitate.

7. The anti-seepage and highly extensible PVC coil for swimming pools according to claim 6, characterized in that, The plasticizer includes a polyester plasticizer, a synthetic plant ester plasticizer, and trioctyl trimellitate.

8. The anti-seepage and highly extensible PVC coil for swimming pools according to claim 7, characterized in that, The plasticizer includes a polyester plasticizer, a synthetic plant ester plasticizer, and trioctyl trimellitate in a weight ratio of (1.4 - 1.6):(0.2 - 0.4):(0.6 - 0.9).

9. The anti-seepage and highly extensible PVC coil for swimming pools according to claim 1, characterized in that, The antioxidant is selected from at least one of antioxidant 1010, antioxidant 1076, and antioxidant 1098.

10. A method for preparing the anti-seepage and highly extensible PVC coil for swimming pools according to any one of claims 1-9, characterized in that, Comprising the following steps: Add the components into a mixer and stir until uniform, extrude with a twin-screw extruder, send it into a three-roll calender for cooling and shaping, carry out radiation crosslinking, and finally draw it to a coiler for coiling to obtain a high-impermeability and high-ductility PVC coil for swimming pools.

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