Corrosion-resistant damping PVC (polyvinyl chloride) material and preparation process thereof
By adding zinc molybdate, zirconium phosphate and carbon nanotubes to the PVC material to form a dense barrier and passivation film, and adding elastomers to achieve reversible stretching, the corrosion and shock absorption problems of PVC materials under extreme corrosion environments and dynamic loads are solved, providing comprehensive corrosion resistance and shock absorption performance.
Patent Information
- Application Number
- CN202510634763.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-16
- Publication Date
- 2025-07-04
AI Technical Summary
Traditional PVC materials are prone to corrosion and powderization under extreme corrosion environments and dynamic loads, and have poor shock absorption effects. The existing improvement methods have contradictions in footwear applications, and cannot simultaneously improve corrosion resistance and shock absorption performance.
Zinc molybdate, zirconium phosphate and carbon nanotubes are blended with PVC resin to prevent the penetration of corrosive media by forming a dense barrier and passivation film, and elastomers are added to achieve reversible stretching and retraction, enhancing the corrosion resistance and shock absorption properties of the material.
In a corrosive environment, dense barriers and passivation films are automatically formed to slow down corrosion speeds and have excellent shock absorption performance. They are suitable for plastic shoes and plastic products.
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Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of PVC materials, and particularly relates to a corrosion-resistant and shock-absorbing PVC material and a preparation process thereof. Background Art
[0002] Polyvinyl chloride (PVC), as a general-purpose polymer material, is widely used in fields such as leather and plastic products due to its low cost, excellent processing performance, high mechanical strength, and weather resistance. It particularly occupies an important market share in footwear products such as plastic shoes and industrial protective boots.
[0003] However, traditional PVC materials have significant defects in extreme corrosion environments and dynamic load scenarios. They are prone to corrosion in strong acid, strong base, or salt spray environments. The soles made of PVC are prone to corrosion and powdering, resulting in cracking or even overall damage at the joint between the upper and the sole, greatly shortening the service life of protective shoes. At the same time, the PVC material itself is hard and brittle, and the shock-absorbing effect of the shoe body is poor. Under dynamic loads (such as long-term walking and heavy object impact), it cannot effectively absorb the foot pressure and ground vibration energy, easily causing fatigue or even joint damage to the wearer. Existing improvement methods can partially improve the performance by adding rubber or rigid fillers, but there are still contradictions in footwear applications. For example, adding styrene-butadiene rubber (SBR) can improve the flexibility of the sole, but it will reduce the oil resistance and chemical corrosion resistance of the shoe material; while adding rigid fillers such as glass fiber can enhance the support of the shoe body, but it will lead to an increase in the hardness of the sole and a deterioration of the cushioning performance. Summary of the Invention
[0004] Aiming at the deficiencies of the prior art, the present invention provides a corrosion-resistant and shock-absorbing PVC material and a preparation process thereof.
[0005] The first aspect of the present invention lies in providing a corrosion-resistant and shock-absorbing PVC material, which comprises the following raw materials in parts by weight: 90 - 110 parts of PVC resin, 8 - 12 parts of zinc molybdate, 3 - 5 parts of zirconium phosphate, 2 - 4 parts of carbon nanotubes, 1 - 2 parts of silane coupling agent, 10 - 15 parts of elastomer, 15 - 20 parts of plasticizer, and 4 - 6 parts of heat stabilizer.
[0006] In some embodiments, the silane coupling agent is selected from at least one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-mercaptopropyltrimethoxysilane; the elastomer is selected from at least one of nitrile rubber, chloroprene rubber, and acrylate rubber; the plasticizer is selected from at least one of epoxidized soybean oil, epoxidized linseed oil, and dioctyl phthalate; the heat stabilizer is selected from at least one of calcium-zinc stabilizer and organotin heat stabilizer.
[0007] It should be noted that zinc molybdate is an inorganic metal salt with rich hydroxyl groups on its surface and is highly hydrophilic. The PVC matrix is a hydrophobic organic polymer. When directly blended, the interfacial bonding between the two is weak. Therefore, a silane coupling agent is added to modify the zinc molybdate, which dehydrates and condenses with the hydroxyl groups on the surface of the zinc molybdate to form a Si-O-Mo / Zn covalent bond, converting the surface of the zinc molybdate from hydrophilic to hydrophobic, thereby enhancing its compatibility with PVC.
[0008] Elastomer is one of the core components of the present invention for improving the shock absorption performance of the material. The molecular chain of the elastomer undergoes reversible extension and contraction under the action of external force (vibration, impact), converts mechanical energy into thermal energy, disperses stress through deformation to prevent the expansion of microcracks, wraps the filler to reduce direct contact with the corrosive medium, and avoids brittle fracture of the material caused by corrosion.
[0009] The second aspect of the present invention is to provide a preparation process of a corrosion-resistant and shock-absorbing PVC material, comprising the following steps:
[0010] S1: mixing zinc molybdate, a silane coupling agent and a solvent and drying the mixture to obtain modified zinc molybdate;
[0011] S2: adding zirconium phosphate, carbon nanotubes and a dispersant, and ball milling under the protection of an inert gas to obtain a zirconium phosphate-carbon nanotube blend;
[0012] S3: mixing PVC resin, plasticizer and heat stabilizer at low temperature, and then adding modified zinc molybdate and zirconium phosphate-carbon nanotube blend and mixing at high temperature;
[0013] S4: adding the elastomer to the mixed system obtained in S3, transferring the mixture to an extruder for melt extrusion, and obtaining the corrosion-resistant and shock-absorbing PVC material after water cooling, pelletizing and drying.
[0014] The present invention directly adds zinc molybdate as a modified filler into the PVC matrix. Its corrosion resistance function is automatically triggered when the material is exposed to a corrosive environment (acid, alkali, salt spray). + , Cl - ) infiltration, zinc molybdate dissolves into Zn 2+ and MoO4 2- , Zn 2+ With MoO4 2- Combined with corrosive ions in the environment (such as OH - 、SO4 2- ), forming insoluble complexes (such as ZnMoO4·nH2O, Zn(OH)2 / MoO3 mixtures), which are deposited in the micropores and cracks of the PVC matrix to form a dense barrier, and a dense passivation film is formed on the PVC surface to prevent further penetration of the corrosive medium. Carbon nanotubes can form a high aspect ratio network structure in the PVC matrix, disperse local corrosion currents, and avoid pitting expansion.
[0015] In addition to the contribution of zinc molybdate to the anti-corrosion performance, zirconium phosphate is added in the present invention. Zirconium phosphate is a layered inorganic material. Its layered arrangement in the PVC matrix can force the corrosion medium to detour, significantly extend the penetration path, and slow down the corrosion rate. Carbon nanotubes can also be incorporated into zirconium phosphate by means including but not limited to ball milling to form a physical interwoven network to prevent the agglomeration of carbon nanotubes. The high modulus of zirconium phosphate can effectively improve the stiffness and dimensional stability of the composite material, disperse the external load through the layered structure, reduce the local stress concentration, enhance the mechanical properties of the material, and achieve a shock-absorbing effect.
[0016] In some embodiments, the solvent is selected from at least one of ethanol, isopropanol, and acetone; the mass ratio of the solvent to zinc molybdate is 5-10:1.
[0017] In some embodiments, in S1, the mixing temperature is 60-70°C, ultrasonic mixing is carried out at a frequency of 40-50 kHz, and the drying temperature is 80-90°C.
[0018] In some embodiments, in S2, the ball milling speed is 200-350 rpm, the ball milling time is 2-3 h, and the ball milling medium is zirconia balls with a particle size of 3-4 mm.
[0019] Inert gases such as nitrogen and argon are introduced during ball milling because when carbon nanotubes are subjected to mechanical forces (such as ball milling impact and frictional heat generation) in the air, their surfaces are easily oxidized to form functional groups such as carboxyl and hydroxyl groups. Oxidation will cause defects in the tube wall and thus a decrease in tensile strength. At the same time, the dispersant polyvinylpyrrolidone is also easily decomposed by heat in an oxygen-containing environment and loses its dispersing effect, making it impossible for carbon nanotubes and zirconium phosphate to be evenly dispersed.
[0020] In some embodiments, the dispersant is polyvinylpyrrolidone with a concentration of 0.4-0.6 wt%, and the dosage of the dispersant is 0.5-0.6% of the total weight of zirconium phosphate and carbon nanotubes.
[0021] In some embodiments, in S3, the low-temperature mixing temperature is 50-60°C, and the low-temperature mixing time is 5-7 min; the high-temperature mixing temperature is 90-100°C, and the high-temperature mixing time is 10-12 min.
[0022] The present invention adopts staged temperature-controlled mixing because the plasticizer is easily degraded at high temperatures. Low-temperature mixing can protect the molecular structure of the plasticizer and prevent high-temperature oxidation; one-time high-temperature mixing will damage the heat-sensitive components, while low-temperature mixing cannot cause the components to react.
[0023] In some embodiments, in S4, the screw speed of the extruder is 200-220 rpm, the melt pressure of the extruder is 8-10 MPa, and the melting temperature of the extruder is 160-175°C.
[0024] In some embodiments, the drying temperature is 60 - 65 °C and the drying time is 2 - 3 h.
[0025] Compared with the prior art, the present invention has the following beneficial effects:
[0026] The corrosion - resistant and shock - absorbing PVC material provided by the present invention, with the addition of zinc molybdate, can automatically trigger the corrosion - resistant mechanism when encountering a corrosive environment, generate insoluble complexes, form a dense barrier and a passivation film, avoid the expansion of pitting corrosion by dispersing the local corrosion current, effectively prevent the penetration of corrosive media, slow down the corrosion rate, and has excellent corrosion - resistant performance; in addition, an elastomer is added to the PVC material of the present invention, which can undergo reversible stretching and retraction under external force, has a layered structure dispersion force, mechanical properties, and shock - absorbing performance, and can be widely applied to fields such as plastic shoes and plastic products. Detailed implementation manners
[0027] The present invention will be further described in detail below in conjunction with the embodiments.
[0028] Example 1
[0029] A corrosion - resistant and shock - absorbing PVC material, comprising the following raw materials in parts by weight: 100 parts of PVC resin, 10 parts of zinc molybdate, 4 parts of zirconium phosphate, 3 parts of carbon nanotubes, 2 parts of γ - aminopropyltriethoxysilane, 12 parts of nitrile rubber, 17 parts of epoxidized soybean oil, and 5 parts of calcium - zinc stabilizer.
[0030] The above - mentioned corrosion - resistant and shock - absorbing PVC material is prepared by the following steps:
[0031] S1: Ultrasonically mix zinc molybdate, γ - aminopropyltriethoxysilane and ethanol at 65 °C and a frequency of 45 kHz, and then dry at 85 °C to obtain modified zinc molybdate; the mass ratio of ethanol to zinc molybdate is 8:1.
[0032] S2: Add zirconium phosphate, carbon nanotubes and polyvinylpyrrolidone with a concentration of 0.5 wt%, introduce nitrogen, and ball - mill for 3 h at a rotation speed of 300 rpm. The ball - mill medium is 4 - mm zirconia balls to obtain a zirconium phosphate - carbon nanotube blend. Among them, the dosage of the dispersant is 0.5% of the total weight of zirconium phosphate and carbon nanotubes.
[0033] S3: Stir - mix PVC resin, epoxidized soybean oil, and calcium - zinc stabilizer at 55 °C for 6 min, and then add modified zinc molybdate and zirconium phosphate - carbon nanotube blend and stir - mix at 100 °C for 10 min.
[0034] S4: Add nitrile rubber to the mixed system obtained in S3, transfer it to an extruder, and melt-extrude it at a screw speed of 210 rpm, a melt pressure of 10 MPa, and a melting temperature of 170 °C in the extruder. After water cooling, pelletizing, and drying at 65 °C for 2.5 h, the corrosion-resistant and shock-absorbing PVC material is obtained.
[0035] Example 2
[0036] A corrosion-resistant and shock-absorbing PVC material, comprising the following raw materials in parts by weight: 90 parts of PVC resin, 8 parts of zinc molybdate, 3 parts of zirconium phosphate, 2 parts of carbon nanotubes, 1 part of γ-glycidyletheroxypropyltrimethoxysilane, 10 parts of chloroprene rubber, 15 parts of epoxidized linseed oil, and 4 parts of organotin heat stabilizer.
[0037] The above corrosion-resistant and shock-absorbing PVC material is prepared by the following steps:
[0038] S1: Ultrasonically mix zinc molybdate, γ-glycidyletheroxypropyltrimethoxysilane, and isopropanol at 70 °C and a frequency of 50 kHz, and then dry at 80 °C to obtain modified zinc molybdate; the mass ratio of ethanol to zinc molybdate is 10:1.
[0039] S2: Add zirconium phosphate, carbon nanotubes, and polyvinylpyrrolidone with a concentration of 0.6 wt%, introduce nitrogen, and ball-mill for 2 h at a rotation speed of 350 rpm. The ball-milling medium is 4 mm zirconia balls to obtain a zirconium phosphate-carbon nanotube blend. Among them, the dosage of the dispersant is 0.4% of the total weight of zirconium phosphate and carbon nanotubes.
[0040] S3: Stir and mix PVC resin, epoxidized linseed oil, and organotin heat stabilizer at 50 °C for 7 min, and then add modified zinc molybdate and zirconium phosphate-carbon nanotube blend and stir and mix at 90 °C for 12 min.
[0041] S4: Add chloroprene rubber to the mixed system obtained in S3, transfer it to an extruder, and melt-extrude it at a screw speed of 200 rpm, a melt pressure of 8 MPa, and a melting temperature of 160 °C in the extruder. After water cooling, pelletizing, and drying at 60 °C for 3 h, the corrosion-resistant and shock-absorbing PVC material is obtained.
[0042] Example 3
[0043] A corrosion-resistant and shock-absorbing PVC material, comprising the following raw materials in parts by weight: 110 parts of PVC resin, 12 parts of zinc molybdate, 5 parts of zirconium phosphate, 4 parts of carbon nanotubes, 2 parts of γ-mercaptopropyltrimethoxysilane, 15 parts of acrylate rubber, 20 parts of dioctyl phthalate, and 6 parts of calcium-zinc stabilizer.
[0044] The above corrosion-resistant and shock-absorbing PVC material is prepared by the following steps:
[0045] S1: Mix zinc molybdate, γ-mercaptopropyltrimethoxysilane and acetone by ultrasonic at 60 °C and a frequency of 40 kHz, and then dry at 90 °C to obtain modified zinc molybdate; the mass ratio of ethanol to zinc molybdate is 5:1.
[0046] S2: Add zirconium phosphate, carbon nanotubes and polyvinylpyrrolidone with a concentration of 0.6 wt%, introduce nitrogen, and ball mill for 3 h at a rotation speed of 200 rpm. The ball milling medium is 3 mm zirconia balls to obtain a zirconium phosphate-carbon nanotube blend. Among them, the dosage of the dispersant is 0.6% of the total weight of zirconium phosphate and carbon nanotubes.
[0047] S3: Stir and mix PVC resin, dioctyl phthalate, and calcium-zinc stabilizer at 60 °C for 5 min, and then add the modified zinc molybdate and zirconium phosphate-carbon nanotube blend and stir and mix at 110 °C for 10 min.
[0048] S4: Add acrylate rubber to the mixed system obtained in S3, transfer it to an extruder, and melt extrude at an extruder screw rotation speed of 220 rpm, an extruder melt pressure of 10 MPa, and an extruder melting temperature of 175 °C. After water cooling, pelletizing, and drying at 60 °C for 2 h, the corrosion-resistant and shock-absorbing PVC material is obtained.
[0049] Example 4
[0050] A corrosion-resistant and shock-absorbing PVC material, comprising the following raw materials in parts by weight: 100 parts of PVC resin, 12 parts of zinc molybdate, 5 parts of zirconium phosphate, 3 parts of carbon nanotubes, 2 parts of γ-aminopropyltriethoxysilane, 15 parts of nitrile rubber, 20 parts of dioctyl phthalate, and 6 parts of calcium-zinc stabilizer.
[0051] The above corrosion-resistant and shock-absorbing PVC material is prepared by the following steps:
[0052] S1: Mix zinc molybdate, γ-aminopropyltriethoxysilane and ethanol by ultrasonic at 60 °C and a frequency of 50 kHz, and then dry at 90 °C to obtain modified zinc molybdate; the mass ratio of ethanol to zinc molybdate is 8:1.
[0053] S2: Add zirconium phosphate, carbon nanotubes and polyvinylpyrrolidone with a concentration of 0.5 wt%, introduce nitrogen, and ball mill for 3 h at a rotation speed of 200 rpm. The ball milling medium is 4 mm zirconia balls to obtain a zirconium phosphate-carbon nanotube blend. Among them, the dosage of the dispersant is 0.5% of the total weight of zirconium phosphate and carbon nanotubes.
[0054] S3: Stir and mix PVC resin, dioctyl phthalate, and calcium-zinc stabilizer at 60 °C for 5 min, and then add the modified zinc molybdate and zirconium phosphate-carbon nanotube blend and stir and mix at 110 °C for 10 min.
[0055] S4: Add nitrile rubber into the mixed system obtained in S3, transfer it to an extruder, and perform melt extrusion at an extruder screw speed of 210 rpm, an extruder melt pressure of 10 MPa, and an extruder melting temperature of 175 °C. After water cooling, pelletizing, and drying at 60 °C for 3 h, the corrosion-resistant and shock-absorbing PVC material is obtained.
[0056] Example 5
[0057] A corrosion-resistant and shock-absorbing PVC material, comprising the following raw materials in parts by weight: 110 parts of PVC resin, 12 parts of zinc molybdate, 5 parts of zirconium phosphate, 4 parts of carbon nanotubes, 2 parts of γ-aminopropyltriethoxysilane, 10 parts of nitrile rubber, 15 parts of epoxidized linseed oil, and 5 parts of calcium-zinc stabilizer.
[0058] The above corrosion-resistant and shock-absorbing PVC material is prepared by the following steps:
[0059] S1: Ultrasonically mix zinc molybdate, γ-aminopropyltriethoxysilane, and isopropanol at 65 °C and a frequency of 50 kHz, and then dry at 85 °C to obtain modified zinc molybdate; the mass ratio of ethanol to zinc molybdate is 6:1.
[0060] S2: Add zirconium phosphate, carbon nanotubes, and polyvinylpyrrolidone with a concentration of 0.5 wt%, introduce nitrogen, and ball mill at a rotation speed of 300 rpm for 2 h. The ball milling medium is 3 mm zirconia balls to obtain a zirconium phosphate-carbon nanotube blend. Among them, the dosage of the dispersant is 0.5% of the total weight of zirconium phosphate and carbon nanotubes.
[0061] S3: Stir and mix PVC resin, epoxidized linseed oil, and calcium-zinc stabilizer at 55 °C for 6 min, and then add modified zinc molybdate and zirconium phosphate-carbon nanotube blend and stir and mix at 100 °C for 10 min.
[0062] S4: Add nitrile rubber into the mixed system obtained in S3, transfer it to an extruder, and perform melt extrusion at an extruder screw speed of 220 rpm, an extruder melt pressure of 10 MPa, and an extruder melting temperature of 170 °C. After water cooling, pelletizing, and drying at 65 °C for 3 h, the corrosion-resistant and shock-absorbing PVC material is obtained.
[0063] Comparative Example 1
[0064] It is the same as Example 1, except that modified zinc molybdate is not added.
[0065] Comparative Example 2
[0066] It is the same as Example 1, except that carbon nanotubes are not added.
[0067] Comparative Example 3
[0068] Same as Example 1, except that zirconium phosphate is not added.
[0069] Comparative Example 4
[0070] Same as Example 1, except that the elastomer is not added.
[0071] To prove that the corrosion-resistant and shock-absorbing PVC material provided by the embodiments of the present invention has excellent corrosion resistance and shock-absorbing performance, the PVC materials prepared in Examples 1-5 and Comparative Examples 1-3 were tested for corrosion degree, tensile strength, elongation at break, and damping coefficient. The specific test results are shown in Table 1.
[0072] Tensile strength: Conducted in accordance with GB / T8804.2-2016;
[0073] Impact performance test: Conducted at 20 °C in accordance with GB / T13525-1992;
[0074] Elongation at break: Tested in accordance with GB / T5836-1996;
[0075] Corrosion resistance: After the sample is immersed in the medium for 24 h, measure the weight change before and after immersion. Weight change rate of -0.5 to +3.0%, corrosion-resistant; weight change rate of +3.0 to +8.0%, -0.5 to -3.0%, still corrosion-resistant; weight change rate < -3%, > +8%, not corrosion-resistant; tensile strength about 60 MPa, impact strength 5-10 kJ / m 2 .
[0076] Damping evaluation method: Conduct dynamic mechanical property tests in accordance with GB / T 18258-2000, and use a dynamic mechanical analyzer (DMA) to test the damping coefficient.
[0077] Table 1
[0078]
[0079]
[0080] As can be seen from Table 1, compared with Comparative Examples 1-4, the corrosion-resistant and shock-absorbing PVC material provided by the embodiments of the present invention has more excellent toughness, impact resistance, corrosion resistance, and shock-absorbing performance. In Comparative Example 1, modified zinc molybdate was not added, so it does not have corrosion resistance; in Comparative Example 2, carbon nanotubes were not added, resulting in a significant decrease in the damping coefficient and poor seismic performance; in Comparative Examples 3 and 4, zirconium phosphate and elastomer were not added respectively, resulting in a decline in the overall performance.
[0081] Cooperate with each other. The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.
Claims
1. A corrosion-resistant and shock-absorbing PVC material, characterized in that, It comprises raw materials in the following parts by weight: 90 - 110 parts of PVC resin, 8 - 12 parts of zinc molybdate, 3 - 5 parts of zirconium phosphate, 2 - 4 parts of carbon nanotubes, 1 - 2 parts of silane coupling agent, 10 - 15 parts of elastomer, 15 - 20 parts of plasticizer, and 4 - 6 parts of heat stabilizer.
2. The corrosion-resistant and shock-absorbing PVC material according to claim 1, characterized in that The silane coupling agent is selected from at least one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-mercaptopropyltrimethoxysilane; the elastomer is selected from at least one of nitrile rubber, chloroprene rubber, and acrylate rubber; the plasticizer is selected from at least one of epoxidized soybean oil, epoxidized linseed oil, and dioctyl phthalate; the heat stabilizer is selected from at least one of calcium-zinc stabilizer and organotin heat stabilizer.
3. The preparation process of the corrosion-resistant and shock-absorbing PVC material according to claim 1 or 2, characterized in that, It includes the following steps: S1: Mix the zinc molybdate, the silane coupling agent and a solvent, and then dry to obtain modified zinc molybdate. S2: Add the zirconium phosphate, the carbon nanotubes and a dispersant, and ball mill under the protection of inert gas to obtain a zirconium phosphate-carbon nanotube blend. S3: Mix the PVC resin, the plasticizer, and the heat stabilizer at a low temperature, and then add the modified zinc molybdate and the zirconium phosphate-carbon nanotube blend and mix at a high temperature. S4: Add the elastomer to the mixed system obtained in S3, transfer it to an extruder for melt extrusion, and obtain the corrosion-resistant and shock-absorbing PVC material after water cooling - pelletizing - drying.
4. The preparation process of the corrosion-resistant and shock-absorbing PVC material according to claim 3, characterized in that, The solvent is selected from at least one of ethanol, isopropanol, and acetone; the mass ratio of the solvent to the zinc molybdate is 5 - 10:
1.
5. The preparation process of the corrosion-resistant and shock-absorbing PVC material according to claim 3, characterized in that, In S1, the mixing temperature is 60 - 70°C, ultrasonic mixing is carried out at a frequency of 40 - 50 kHz, and the drying temperature is 80 - 90°C.
6. The preparation process of the corrosion-resistant and shock-absorbing PVC material according to claim 3, characterized in that, In S2, the ball milling speed is 200 - 350 rpm, the ball milling time is 2 - 3 h, and the ball milling medium is zirconia balls with a particle size of 3 - 4 mm.
7. The preparation process of the corrosion-resistant and shock-absorbing PVC material according to claim 6, characterized in that, The dispersant is polyvinylpyrrolidone with a concentration of 0.4 - 0.6 wt%, and the dosage of the dispersant is 0.5 - 0.6% of the total weight of the zirconium phosphate and the carbon nanotubes.
8. The preparation process of the corrosion-resistant and shock-absorbing PVC material according to claim 3, characterized in that, In S3, the low-temperature mixing temperature is 50 - 60°C, and the low-temperature mixing time is 5 - 7 min; the high-temperature mixing temperature is 90 - 100°C, and the high-temperature mixing time is 10 - 12 min.
9. The preparation process of the corrosion-resistant and shock-absorbing PVC material according to claim 3, characterized in that, In S4, the screw speed of the extruder is 200 - 220 rpm, the melt pressure of the extruder is 8 - 10 MPa, and the melting temperature of the extruder is 160 - 175°C.
10. The preparation process of the corrosion-resistant and shock-absorbing PVC material according to claim 9, characterized in that, The drying temperature is 60 - 65°C, and the drying time is 2 - 3 h.