High-temperature-resistant and anti-scald PVC tablecloth and preparation method thereof

Abstract

The application relates to the field of high polymer materials, in particular to a high-temperature-resistant and scald-preventing PVC tablecloth and a preparation method thereof. The raw material scheme of the high-temperature-resistant and scald-preventing PVC tablecloth comprises PVC resin, a plasticizer, a reinforcing agent, a filler, an auxiliary functional agent, a silane coupling agent, a heat stabilizer and a lubricant and the like. The high-temperature-resistant and scald-preventing PVC tablecloth provided by the application has the high-temperature-resistant and scald-preventing performance which is efficient, stable and safe, good mechanical properties and corrosion resistance on the basis of keeping excellent cleaning convenience, avoids the performance contradiction problem in the modification of the PVC tablecloth in the prior art, guarantees the improvement of the comprehensive performance, improves the lower limit of application, and meets the increasingly strict application performance requirements of existing consumers on the product.

Description

Technical Field

[0001] This application relates to the field of polymer materials, and in particular to a high-temperature resistant and heat-resistant PVC tablecloth and its preparation method. Background Technology

[0002] Tablecloths, as a common covering material, are widely used on various flat surfaces such as dining tables, conference tables, and workbenches in daily life and commercial settings. They not only beautify the environment but also provide functions such as stain resistance, water resistance, and easy cleaning. Polyvinyl chloride (PVC) tablecloths, due to their significant advantages such as water and oil resistance, ease of cleaning, wear resistance, and low price, are widely used in homes and restaurants, gradually replacing traditional textile tablecloths that are cumbersome to clean. However, with the continuous expansion of usage scenarios, especially in high-temperature environments such as catering, baking, laboratories, and industrial operations, higher requirements are being placed on the heat resistance and scalding resistance of tablecloths.

[0003] However, the inherent poor thermal stability of PVC material has become a technical bottleneck restricting its wider application. Ordinary PVC resin has a low softening point, and soft tablecloths made from it are prone to softening, deformation, or even permanent damage when exposed to high temperatures. When hot food, hot soup bowls, or recently used electric cookers are placed on the table, the high temperature is quickly conducted to the surface of the PVC tablecloth, causing the local temperature to exceed its tolerance limit. This not only damages the tablecloth's appearance and smoothness, but more seriously, under continuous heating, PVC material may decompose and release hydrogen chloride gas. Furthermore, there is a risk of migration and release of added plasticizers and other additives, posing a potential threat to human health.

[0004] To improve the high-temperature resistance of PVC tablecloths, various approaches have been explored in existing technologies. For example, adding inorganic fillers to the PVC substrate can enhance its thermal stability; or cross-linking modification and blending with high-heat-resistant polymers can be used to enhance the overall heat distortion temperature. Although existing technologies have developed multiple pathways to improve the heat resistance and anti-scalding properties of PVC tablecloths, their solutions still have certain limitations. Modifying by adding large amounts of inorganic fillers or complex copolymers often leads to more complex production processes, significantly increased costs, and may even sacrifice the original flexibility and mechanical strength of the PVC material. On the other hand, many modification schemes focus on improving the short-term heat resistance peak of the material, while neglecting the long-term aging resistance and hygienic safety of the tablecloth under complex environments of repeated heating and oil erosion. Some products may still pose a risk of plasticizer migration or release of harmful gases when used at high temperatures for a long time or when exposed to hot oil drips. Summary of the Invention

[0005] The purpose of this application is to develop a PVC tablecloth technology that can maintain the excellent cleaning convenience of PVC tablecloths, while also possessing efficient, stable and safe high-temperature resistance and anti-scalding properties, and maintaining good mechanical properties and corrosion resistance.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of this application provides a high-temperature resistant and heat-resistant PVC tablecloth, which, by weight, comprises the following raw materials: 100-130 parts of PVC resin, 40-65 parts of plasticizer, 6-12 parts of reinforcing agent, 25-40 parts of filler, 8-14 parts of auxiliary functional agent, 0.3-0.5 parts of silane coupling agent, 4-6 parts of heat stabilizer, 1.8-2.5 parts of processing aid, 0.3-0.8 parts of antioxidant, and 0.8-1.2 parts of lubricant.

[0007] Preferably, the degree of polymerization of the PVC resin is 1000~1500.

[0008] More preferably, the degree of polymerization of the PVC resin is 1200~1400.

[0009] More preferably, the PVC resin is SG-3 type PVC resin.

[0010] Preferably, the mass ratio of the PVC resin, reinforcing agent and auxiliary functional agent is (10~12):(0.8~1.1):(1~1.3).

[0011] More preferably, the mass ratio of the PVC resin, reinforcing agent and auxiliary functional agent is (10.5~11):(0.9~1):(1.1~1.2).

[0012] Preferably, the plasticizer is a compound plasticizer of trioctyl trimellitate and dioctyl terephthalate.

[0013] Preferably, the mass ratio of trioctyl trimellitate to dioctyl terephthalate is (4~5.5):(1~2).

[0014] More preferably, the mass ratio of trioctyl trimellitate to dioctyl terephthalate is (4.5~5):(1.3~1.6).

[0015] Preferably, the reinforcing agent is a compound reinforcing agent of vinyl acetate and aluminum glycine.

[0016] Preferably, the mass ratio of vinyl acetate to aluminum glycine is (5~8):(1~2.5).

[0017] More preferably, the mass ratio of vinyl acetate to aluminum glycine is (6~7):(1.5~2).

[0018] By combining vinyl acetate and aluminum glycine, aluminum ions act as complexing centers, combining with carbonyl oxygen atoms on the vinyl acetate molecular chain to construct an internal dynamic cross-linking system within the PVC system. Under external force, energy can be dissipated through the breaking and recombination of coordination bonds, giving the material excellent resilience and tear resistance. When a high-temperature object comes into contact with the tablecloth surface, this network can effectively restrict the thermal movement of the PVC molecular chain, preventing irreversible softening and deformation of the material. At the same time, the presence of coordination bonds also enhances the interfacial bonding force between the components, thus enabling the tablecloth to obtain stable and reliable high-temperature resistance and heat protection without sacrificing flexibility.

[0019] Preferably, the filler is at least one selected from wollastonite powder, light calcium carbonate, talc powder, calcined kaolin, and mica powder.

[0020] More preferably, the filler is wollastonite powder and / or light calcium carbonate.

[0021] More preferably, the filler is a composite filler of wollastonite powder and light calcium carbonate.

[0022] Preferably, the mass ratio of wollastonite powder to light calcium carbonate is (1~2):(1~2).

[0023] More preferably, the mass ratio of wollastonite powder to light calcium carbonate is (1~1.5):(1.3~1.7).

[0024] Preferably, the average mesh size of the wollastonite powder is 800-1500 mesh.

[0025] More preferably, the average mesh size of the wollastonite powder is 1200-1500 mesh.

[0026] Preferably, the light calcium carbonate has an average mesh size of 1200-1800 mesh.

[0027] More preferably, the light calcium carbonate has an average mesh size of 1400-1800 mesh.

[0028] Preferably, the auxiliary functional agent is a compound auxiliary functional agent consisting of chlorinated polyethylene, trimethylolpropane trimethacrylate and pentaerythritol tetra(3-mercaptopropionic acid) ester.

[0029] Preferably, the mass ratio of the chlorinated polyethylene, trimethylolpropane trimethacrylate and pentaerythritol tetra(3-mercaptopropionic acid) ester is (6~10):(2~4):(0.8~1.5).

[0030] More preferably, the mass ratio of the chlorinated polyethylene, trimethylolpropane trimethacrylate and pentaerythritol tetra(3-mercaptopropionic acid) ester is (8~9):(3~3.5):(1~1.2).

[0031] Preferably, the chlorine content of the chlorinated polyethylene is 30-40%.

[0032] More preferably, the chlorinated polyethylene is specifically CPE-135A, manufactured by Shandong Yaxing Chemical.

[0033] Further addition of auxiliary functional agents, with chlorinated polyethylene as a toughening agent, forms a uniformly dispersed action area in the PVC matrix, effectively absorbing and buffering external impact energy. At the same time, the combined effect of the multifunctional olefin bonds of trimethylolpropane trimethacrylate and pentaerythritol tetramercaptopropionate enhances the crosslinking of the system and strengthens the composite network, thereby ultimately enhancing the stress dispersion performance, preventing crack propagation, and improving the overall thermal stability and solvent resistance. Under the premise of maintaining good processing performance, the mechanical strength, heat resistance and corrosion resistance of the tablecloth are comprehensively improved.

[0034] Preferably, the heat stabilizer is at least one of calcium-zinc stabilizer, methyl mercaptan stabilizer, barium-zinc stabilizer, and epoxidized soybean oil stabilizer.

[0035] More preferably, the heat stabilizer is a calcium-zinc stabilizer or a methyl mercaptan stabilizer.

[0036] More preferably, the heat stabilizer is a calcium-zinc stabilizer.

[0037] Preferably, the processing aid is at least one of the ACR processing aids.

[0038] Preferably, the processing aid is ACR-401.

[0039] Preferably, the antioxidant is at least one of antioxidant 1076, antioxidant 264, antioxidant DLTDP, and antioxidant 626.

[0040] More preferably, the antioxidant is a compound antioxidant of antioxidant 1076 and antioxidant 626.

[0041] Preferably, the mass ratio of antioxidant 1076 to antioxidant 626 is (1~1.5):1.

[0042] Preferably, the lubricant is at least one selected from zinc stearate, calcium stearate, paraffin wax, polyethylene wax, and stearamide.

[0043] More preferably, the lubricant is zinc stearate and / or polyethylene wax.

[0044] More preferably, the lubricant is zinc stearate.

[0045] The second aspect of this application provides a method for preparing a high-temperature resistant and heat-resistant PVC tablecloth, specifically including the following steps: S1: PVC resin is sieved and set aside. Filler is added to a mixing tank, dried, and then a silane coupling agent is added. After high-speed stirring, the material is discharged. The above raw materials are mixed in a mixing tank. During this process, reinforcing agent, processing aid, heat stabilizer, antioxidant, and auxiliary functional agent are added in sequence and then mixed at high speed; S2: When the temperature rises to 75~80℃, the remaining raw materials are added. Stirring is continued until the temperature reaches 105~110℃. The material is then immediately discharged to a cold mixer. The hot mixture is quickly cooled and discharged, and then left to stand for storage; S3: The obtained material is plasticized by a screw extruder. After extrusion, the sheet material is fed into a four-roll calender for calendering. The high-temperature film after calendering is passed through an embossing unit, cooled to room temperature, the rough edges are trimmed, and then wound up under low tension to obtain the final product.

[0046] Preferably, the preparation method of the high-temperature resistant and heat-resistant PVC tablecloth specifically includes the following steps: S1: After passing the PVC resin through a 50-80 mesh sieve, the filler is added to a mixing vessel and dried at 110-120°C. Then, a silane coupling agent is added, and the mixture is stirred at high speed for 5-8 minutes before being discharged and cooled. The above raw materials are then stirred and mixed in a mixing vessel. During this process, reinforcing agents, processing aids, heat stabilizers, antioxidants, and auxiliary functional agents are added sequentially. Each addition is stirred at 300-400 rpm for 10-15 minutes. After all the additions are completed, the mixture is continuously stirred at high speed at 600-800 rpm. S2: During the high-speed mixing, the temperature is raised to 75-80°C. Add the remaining raw materials and continue stirring until the temperature reaches 105~110℃. Immediately unload the material into a cold mixer to quickly cool the hot mixture to below 40℃ before discharging. Let it stand for 30~38 hours. S3: Plasticize the obtained material through a screw extruder. Set the temperature to 135~140℃ in zone 1, 145~150℃ in zone 2, 155~160℃ in zone 3, and 150~155℃ in zone 4. Extrude the sheet material 4~6 times, control the roller temperature at 150~155℃, and send it into a four-roll calender for calendering. The high-temperature film after calendering passes through an embossing unit at 60~90℃ and is gradually cooled to room temperature by the cooling roller group. Trim the rough edges and wind it up under low tension to obtain the final product.

[0047] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: 1. The high-temperature resistant and heat-resistant PVC tablecloth prepared in this application retains the convenient characteristics of traditional PVC tablecloths, such as waterproofness, oil resistance, and ease of cleaning, while significantly improving safety and durability in actual use. This tablecloth maintains its shape stability when in contact with high-temperature heat sources, is not prone to softening or deformation, and exhibits stable mechanical properties, resulting in excellent application performance. Furthermore, its surface is smooth and flat, has good corrosion resistance, and a soft and comfortable feel. It maintains a good appearance even after long-term use in various scenarios, including daily applications, providing consumers with a safer, more reliable, and durable PVC tablecloth option.

[0048] 2. This application incorporates vinyl acetate and aluminum glycine, with aluminum ions as the complexing center, which combine with the carbonyl oxygen atoms on the vinyl acetate molecular chain to construct an internal dynamic cross-linking system in the PVC system. Under external force, energy can be dissipated through the breaking and recombination of coordination bonds, giving the material excellent resilience and tear resistance. It can also enhance the interfacial bonding force between the components, thereby enabling the tablecloth to obtain stable and reliable high-temperature resistance and heat protection performance without sacrificing flexibility.

[0049] 3. This application incorporates auxiliary functional agents, using chlorinated polyethylene as a toughening agent to form a uniformly dispersed action area in the PVC matrix, effectively absorbing and buffering external impact energy. At the same time, the combined action of the multifunctional olefin bonds of trimethylolpropane trimethacrylate and pentaerythritol tetramercaptopropionate enhances the crosslinking of the system and strengthens the composite network, thereby ultimately enhancing the stress dispersion performance, preventing crack propagation, and improving the overall thermal stability and solvent resistance. Under the premise of maintaining good processing performance, the mechanical strength, heat resistance and corrosion resistance of the tablecloth are comprehensively improved. Attached Figure Description

[0050] Figure 1 This is a photograph of the high-temperature resistant and heat-resistant PVC tablecloth prepared according to Example 1 of this application. Detailed Implementation

[0051] The technical solutions in the embodiments of this application will be clearly and completely described below. The described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] In the following specific embodiments, unless otherwise specified, the sources / preparation methods of some raw materials are as follows: PVC resin SG-3 type, degree of polymerization 1300, Wuhan Jiyesheng Chemical Co., Ltd.

[0053] Chlorinated polyethylene CPE-135A, chlorine content 38%, Shandong Yaxing Chemical.

[0054] Processing aid ACR-401, from Zhejiang Jiashan Sanyi New Materials.

[0055] Calcium-zinc stabilizer R-216, manufactured by Ruiying Plastics & Chemical Co., Ltd. in Qingyang County, Anhui Province. Example 1

[0056] A high-temperature resistant and heat-resistant PVC tablecloth, by weight, comprises the following raw materials: 105 parts PVC resin, 55.5 parts plasticizer, 9.6 parts reinforcing agent, 32.8 parts filler, 12.2 parts auxiliary functional agent, 0.4 parts silane coupling agent, 4.8 parts heat stabilizer, 1.9 parts processing aid, 0.4 parts antioxidant, and 1 part lubricant.

[0057] The PVC resin is SG-3 type PVC resin with a degree of polymerization of 1300.

[0058] The plasticizer is a compound plasticizer of trioctyl trimellitate and dioctyl terephthalate in a mass ratio of 4.5:1.5.

[0059] The reinforcing agent is a compound reinforcing agent of vinyl acetate and aluminum glycine, with a mass ratio of 6.4:1.6.

[0060] The filler is a composite filler of wollastonite powder and light calcium carbonate in a mass ratio of 1.4:1.6; the average mesh size of the wollastonite powder is 1200 mesh; and the average mesh size of the light calcium carbonate is 1500 mesh.

[0061] The auxiliary functional agent is a compound auxiliary functional agent consisting of chlorinated polyethylene CPE-135A, trimethylolpropane trimethacrylate and pentaerythritol tetra(3-mercaptopropionic acid) ester, with a mass ratio of 8:3.5:1.

[0062] The heat stabilizer is calcium-zinc stabilizer R-216; the processing aid is ACR-401; the lubricant is zinc stearate; the silane coupling agent is KH-570; and the antioxidant is a compound antioxidant of antioxidant 1076 and antioxidant 626 in a mass ratio of 1:1.

[0063] A method for preparing a high-temperature resistant and heat-resistant PVC tablecloth includes the following steps: S1: After passing PVC resin through an 80-mesh sieve, add filler to a mixing vessel, dry the moisture at 110°C, add silane coupling agent, stir at high speed for 8 minutes, discharge and cool, then stir the above raw materials in the mixing vessel, adding reinforcing agent, processing aid, heat stabilizer, antioxidant and auxiliary functional agent in sequence, stirring at 400 rpm for 15 minutes each time, and after all additions are completed, continue high-speed mixing at 800 rpm; S2: During high-speed mixing, wait for the temperature to rise. When the temperature reaches 80°C, add the remaining raw materials and continue stirring until the temperature reaches 110°C. Immediately unload the material into a cold mixer to quickly cool the hot mixture to below 40°C before discharging. Let it stand for 36 hours. S3: Plasticize the obtained material through a screw extruder. Set the temperature to 135°C in zone 1, 145°C in zone 2, 155°C in zone 3, and 150°C in zone 4. Extrude the sheet material through 5 passes, with the roller temperature controlled at 155°C. Then, send it into a four-roll calender for calendering. The high-temperature film after calendering passes through an 80°C embossing unit and is gradually cooled to room temperature by the cooling rollers. Trim the rough edges and wind it up under low tension to obtain the final product.

[0064] The actual product of the high-temperature resistant and heat-resistant PVC tablecloth produced in this embodiment is shown below. Figure 1 As shown. Example 2

[0065] A high-temperature resistant and heat-resistant PVC tablecloth, by weight, comprises the following raw materials: 115 parts PVC resin, 58 parts plasticizer, 10.5 parts reinforcing agent, 31.5 parts filler, 10.8 parts auxiliary functional agent, 0.4 parts silane coupling agent, 4.8 parts heat stabilizer, 1.9 parts processing aid, 0.4 parts antioxidant, and 1 part lubricant.

[0066] The plasticizer is a compound plasticizer of trioctyl trimellitate and dioctyl terephthalate in a mass ratio of 4.2:1.8.

[0067] The remaining implementation methods are the same as in Example 1. Example 3

[0068] A high-temperature resistant and heat-resistant PVC tablecloth, by weight, comprises the following raw materials: 105 parts PVC resin, 55.5 parts plasticizer, 8.8 parts reinforcing agent, 32.8 parts filler, 13 parts auxiliary functional agent, 0.4 parts silane coupling agent, 4.8 parts heat stabilizer, 1.9 parts processing aid, 0.4 parts antioxidant, and 1 part lubricant.

[0069] The reinforcing agent is a compound reinforcing agent of vinyl acetate and aluminum glycine, with a mass ratio of 7:2.

[0070] The remaining implementation methods are the same as in Example 1.

[0071] Comparative Example 1 A high-temperature resistant and heat-resistant PVC tablecloth, by weight, comprises the following raw materials: 125 parts PVC resin, 60 parts plasticizer, 9.6 parts reinforcing agent, 32.8 parts filler, 12.2 parts auxiliary functional agent, 0.4 parts silane coupling agent, 5.5 parts heat stabilizer, 2.1 parts processing aid, 0.5 parts antioxidant, and 1.2 parts lubricant.

[0072] The plasticizer is a compound plasticizer of trioctyl trimellitate and dioctyl terephthalate in a mass ratio of 5.5:0.5.

[0073] The remaining implementation methods are the same as in Example 1.

[0074] Comparative Example 2 A high-temperature resistant and heat-resistant PVC tablecloth, by weight, comprises the following raw materials: 125 parts PVC resin, 60 parts plasticizer, 12.5 parts reinforcing agent, 38.5 parts filler, 2.5 parts auxiliary functional agent, 0.4 parts silane coupling agent, 5.5 parts heat stabilizer, 2.1 parts processing aid, 0.5 parts antioxidant, and 1.2 parts lubricant.

[0075] The remaining implementation methods are the same as in Example 1.

[0076] Comparative Example 3 A high-temperature resistant and heat-resistant PVC tablecloth, by weight, comprises the following raw materials: 105 parts PVC resin, 55.5 parts plasticizer, 3 parts reinforcing agent, 32.8 parts filler, 14.5 parts auxiliary functional agent, 0.4 parts silane coupling agent, 4.8 parts heat stabilizer, 1.9 parts processing aid, 0.4 parts antioxidant, and 1 part lubricant.

[0077] The remaining implementation methods are the same as in Example 1.

[0078] Comparative Example 4 A high-temperature resistant and heat-resistant PVC tablecloth, by weight, comprises the following raw materials: 105 parts PVC resin, 55.5 parts plasticizer, 9.6 parts reinforcing agent, 32.8 parts filler, 12.2 parts auxiliary functional agent, 0.4 parts silane coupling agent, 4.8 parts heat stabilizer, 1.9 parts processing aid, 0.4 parts antioxidant, and 1 part lubricant.

[0079] The reinforcing agent is a compound reinforcing agent of vinyl acetate and aluminum glycine, with a mass ratio of 7.5:0.5.

[0080] The remaining implementation methods are the same as in Example 1.

[0081] Comparative Example 5 A high-temperature resistant and heat-resistant PVC tablecloth, by weight, comprises the following raw materials: 105 parts PVC resin, 55.5 parts plasticizer, 9.6 parts reinforcing agent, 32.8 parts filler, 12.2 parts auxiliary functional agent, 0.4 parts silane coupling agent, 4.8 parts heat stabilizer, 1.9 parts processing aid, 0.4 parts antioxidant, and 1 part lubricant.

[0082] The auxiliary functional agent is a compound auxiliary functional agent consisting of chlorinated polyethylene CPE-135A, trimethylolpropane trimethacrylate and pentaerythritol tetra(3-mercaptopropionic acid) ester, with a mass ratio of 10:0.5:2.

[0083] The remaining implementation methods are the same as in Example 1.

[0084] Comparative Example 6 A high-temperature resistant and heat-resistant PVC tablecloth, by weight, comprises the following raw materials: 105 parts PVC resin, 55.5 parts plasticizer, 9.6 parts reinforcing agent, 32.8 parts filler, 12.2 parts auxiliary functional agent, 0.4 parts silane coupling agent, 4.8 parts heat stabilizer, 1.9 parts processing aid, 0.4 parts antioxidant, and 1 part lubricant.

[0085] The auxiliary functional agent is a compound auxiliary functional agent consisting of chlorinated polyethylene CPE-135A, trimethylolpropane trimethacrylate and pentaerythritol tetra(3-mercaptopropionic acid) ester, with a mass ratio of 5:7:0.5.

[0086] The remaining implementation methods are the same as in Example 1.

[0087] Performance testing 1. High Temperature Resistance and Scalding Resistance: Place the tablecloth sample flat on a horizontal test table. In a standard laboratory environment with a temperature of 23℃±2℃ and a relative humidity of 50%±5%, adjust for 24 hours. Prepare a flat-bottomed aluminum tray with a diameter of 15cm and heat it to 180℃±2℃ on an electric heating constant temperature device. Immediately place the heated aluminum tray on the center of the tablecloth sample surface and maintain contact for 90 seconds. Then remove it and visually observe the changes in the sample surface condition under natural light. If any scalding marks, softening, melting, discoloration, or deformation are present, it is considered unqualified. Conversely, if no such phenomena occur, it is considered qualified. Each set of examples and comparative examples is tested 50 times, and the pass rate of the test results is recorded in Table 1.

[0088] 2. Mechanical properties: Five dumbbell-shaped specimens with a width of 10 mm and a gauge length of 50 mm were cut from the finished tablecloth. They were tested on a universal testing machine at a tensile speed of 200 mm / min. The maximum tensile strength and elongation at break of the specimens were recorded. The arithmetic mean of 10 tests was taken as the final result and recorded in Table 1.

[0089] 3. Corrosion resistance: Cut a 50mm×50mm sample and dry it in an oven at 105℃ for 1 hour to constant weight. Weigh the initial mass. Immerse the sample completely in a 5% sodium hydroxide solution at a temperature of 23℃±2℃ for 24 hours. After removal, rinse with distilled water, wipe off the surface moisture, dry again to constant weight, and weigh the measured mass. Calculate the mass change rate = (measured mass - initial mass) / initial mass × 100%. Take the arithmetic mean of 10 tests as the final result and record it in Table 1.

[0090] 4. Thermal stability: Cut a 20mm×20mm sample, place it in a glass petri dish, and place it horizontally in a forced-air drying oven preheated to 180℃±3℃. Take out one sample every 10 minutes, observe and record the color change of the sample, until the sample shows obvious color change, record the heating time corresponding to the obvious color change, and record the results in Table 1.

[0091] 5. Water boiling resistance: Cut three 50mm×50mm samples, weigh the initial mass, boil in boiling water for 120 minutes, remove the samples, immediately cool them in distilled water at room temperature for 10 minutes, remove them and wipe off the surface moisture with clean, dry degreased gauze, weigh them within 1 minute to obtain the mass after the test, calculate the mass change rate = (mass after test - initial mass) / initial mass × 100%, take the arithmetic mean of 10 tests as the final result, and record it in Table 1.

[0092] Table 1 Performance Test Results Analysis of test results: The performance test results of Examples 1-3 of this application are superior to those of Comparative Examples 1-6. This is due to the appropriate technical solutions specified in this application used in Examples 1-3, which construct an internal dynamic cross-linking system in the PVC system. Under the action of external force, energy can be dissipated through the breaking and recombination of coordination bonds, giving the material excellent resilience and tear resistance. It can also enhance the interfacial bonding force between the components, thereby enabling the tablecloth to obtain stable and reliable high-temperature resistance and heat protection performance without sacrificing flexibility. In contrast, Comparative Examples 1-6, due to the different technical solutions specified in this application, have a significantly reduced technical effect of their corresponding raw materials in the PVC system, thus ultimately reducing the overall comprehensive performance.

[0093] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-temperature resistant and heat-resistant PVC tablecloth, characterized in that: The raw material formula, by weight, includes: 100-130 parts PVC resin, 40-65 parts plasticizer, 6-12 parts reinforcing agent, 25-40 parts filler, 8-14 parts auxiliary functional agent, 0.3-0.5 parts silane coupling agent, 4-6 parts heat stabilizer, 1.8-2.5 parts processing aid, 0.3-0.8 parts antioxidant, and 0.8-1.2 parts lubricant; The degree of polymerization of the PVC resin is 1000~1500; The reinforcing agent is a compound reinforcing agent of vinyl acetate and aluminum glycine, with a mass ratio of (5~8):(1~2.5). The auxiliary functional agent is a compound auxiliary functional agent of chlorinated polyethylene, trimethylolpropane trimethacrylate and pentaerythritol tetra(3-mercaptopropionic acid) ester, with a mass ratio of (6~10):(2~4):(0.8~1.5).

2. The high-temperature resistant and heat-resistant PVC tablecloth according to claim 1, characterized in that: The mass ratio of the PVC resin, reinforcing agent, and auxiliary functional agent is (10~12):(0.8~1.1):(1~1.3).

3. The high-temperature resistant and heat-resistant PVC tablecloth according to claim 2, characterized in that: The plasticizer is a compound plasticizer of trioctyl trimellitate and dioctyl terephthalate, with a mass ratio of (4~5.5):(1~2).

4. The high-temperature resistant and heat-resistant PVC tablecloth according to claim 3, characterized in that: The filler is at least one of wollastonite powder, light calcium carbonate, talc powder, calcined kaolin, and mica powder.

5. The high-temperature resistant and heat-resistant PVC tablecloth according to claim 4, characterized in that: The filler is wollastonite powder and / or light calcium carbonate.

6. The high-temperature resistant and heat-resistant PVC tablecloth according to claim 5, characterized in that: The average mesh size of the wollastonite powder is 800-1500 mesh; the average mesh size of the light calcium carbonate is 1200-1800 mesh.

7. The high-temperature resistant and heat-resistant PVC tablecloth according to claim 6, characterized in that: The heat stabilizer is at least one of calcium-zinc stabilizer, methyl mercaptan stabilizer, barium-zinc stabilizer, and epoxidized soybean oil stabilizer.

8. The high-temperature resistant and heat-resistant PVC tablecloth according to claim 7, characterized in that: The antioxidant is at least one of antioxidant 1076, antioxidant 264, antioxidant DLTDP, and antioxidant 626.

9. The high-temperature resistant and heat-resistant PVC tablecloth according to claim 8, characterized in that: The lubricant is at least one of zinc stearate, calcium stearate, paraffin wax, polyethylene wax, and stearamide.

10. A method for preparing a high-temperature resistant and heat-resistant PVC tablecloth according to any one of claims 1 to 9, characterized in that: Includes the following steps: S1: After sieving the PVC resin, set it aside. Add the filler to the mixing tank, dry it, and then add the silane coupling agent. After high-speed stirring, discharge the material. Mix the above raw materials in the mixing tank. During this process, add the reinforcing agent, processing aid, heat stabilizer, antioxidant, and auxiliary functional agent in sequence and then mix at high speed. S2: When the temperature rises to 75~80℃, add the remaining raw materials and continue stirring until the temperature reaches 105~110℃. Immediately discharge the material to the cold mixer, quickly cool the hot mixture, and discharge it. Let it stand for storage. S3: Plasticize the obtained material through a screw extruder. After extrusion, the sheet material is fed into a four-roll calender for calendering. The high-temperature film after calendering passes through the embossing unit, then cools to room temperature, trims the burrs, and winds it up under low tension to obtain the final product.

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