Polyvinyl chloride (PVC) material resistant to ferric chloride solution

Abstract

The invention relates to the technical field of PVC production, in particular to a PVC material resistant to a ferric chloride solution. The PVC thin film and the screen cloth layer are sequentially arranged in a stacked mode. The PVC film is prepared from the following raw materials in parts by weight: 90-110 parts of PVC resin powder, 60-65 parts of a plasticizer, 25-30 parts of a filler and 2-3 parts of a heat stabilizer, and the filling agent is barium sulfate. The PVC film has the beneficial effects that the barium sulfate filler is used for replacing calcium carbonate in the formula of the PVC film, so that the chemical reaction between the calcium carbonate and a ferric chloride solution is effectively avoided, the PVC film is prevented from being corroded to form holes, the overall performance of the PVC material is remarkably improved, and the service life of the PVC material is remarkably prolonged.

Description

Technical Field

[0001] This invention relates to the field of PVC production technology, and in particular to a PVC material resistant to ferric chloride solution. Background Technology

[0002] Ferric chloride solution has wide applications in wastewater treatment and metal surface treatment, but its strong oxidizing and acidic properties are highly corrosive to the materials of storage containers, leading to leakage problems in traditional storage containers. Therefore, high requirements are placed on the containers used for storage and transportation. To address these issues, existing ferric chloride solution storage containers often use expensive alloys or fluoroplastics, resulting in high costs and complex manufacturing processes. While traditional PVC materials offer some corrosion resistance, their resistance gradually decreases after continuous contact with ferric chloride solution, making them unsuitable for long-term storage of ferric chloride solution.

[0003] Calcium carbonate is commonly used as a filler in the manufacturing process of PVC materials. However, this filler reacts chemically with ferric chloride solution (which is acidic), causing corrosion and pores in the PVC film layer. This leads to a decline in the overall performance of the PVC material and affects its service life. Furthermore, the polyester fiber mesh used in the PVC material's base fabric layer is easily penetrated by ferric chloride solution, corroding the material from the inside and damaging the bond between the PVC and the yarn, thus affecting the overall performance of the material.

[0004] Therefore, developing a PVC storage material resistant to ferric chloride solution corrosion is of great significance. This material not only needs to possess excellent corrosion resistance but also needs to consider factors such as stability and service life. At the same time, given the widespread use and good corrosion resistance of PVC, replacing expensive alloys or fluoroplastics with more economical and easily processed materials is also an important research direction. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a PVC material resistant to ferric chloride solution, thereby improving the corrosion resistance of PVC material to ferric chloride solution.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: a PVC material resistant to ferric chloride solution is provided, comprising a PVC film and a mesh layer stacked sequentially; The PVC film is made from the following raw materials in the following weight ratios: 90-110 parts PVC resin powder, 60-65 parts plasticizer, 25-30 parts filler and 2-3 parts heat stabilizer; the filler is barium sulfate.

[0007] Furthermore, in the above-mentioned PVC material resistant to ferric chloride solution, the plasticizer is selected from one or more of phthalates and polyurethanes; Furthermore, in the above-mentioned PVC material resistant to ferric chloride solution, the heat stabilizer is selected from one or more of barium-zinc stabilizers and calcium-zinc stabilizers.

[0008] Furthermore, in the aforementioned PVC material resistant to ferric chloride solution, the mesh layer is a mesh treated with anti-wicking properties.

[0009] Furthermore, in the aforementioned PVC material resistant to ferric chloride solution, the mesh fabric is made of polyester fiber.

[0010] Furthermore, in the above-mentioned PVC material resistant to ferric chloride solution, the PVC film is specifically made from the following raw materials in the following weight ratio: 100 parts of PVC resin powder, 63 parts of plasticizer, 27 parts of filler and 3 parts of heat stabilizer.

[0011] The beneficial effects of this invention are as follows: Compared with the prior art, this invention provides a PVC material resistant to ferric chloride solution, which has the following beneficial effects: 1. By using barium sulfate filler to replace calcium carbonate in the PVC film formulation, the chemical reaction between calcium carbonate and ferric chloride solution is effectively avoided, preventing the PVC film from being corroded and developing holes, and significantly improving the overall performance and service life of PVC materials; 2. Antiwicking polyester fiber mesh is used instead of conventional polyester fiber mesh. By selecting high-strength, low-shrinkage antiwicking polyester fiber material containing hydrophobic groups, the mesh has good physical and hydrophobic properties, which effectively reduces the possibility of ferric chloride solution penetrating from the fiber, prevents the solution from corroding the material internally, and improves the bonding strength between PVC and yarn. 3. The ferric chloride solution-resistant PVC material of the present invention adopts a combination of PVC resin powder, plasticizer, barium sulfate filler and heat stabilizer, which has good resistance to ferric chloride corrosion and can provide long-term stable protection for the storage and transportation of ferric chloride solution, meeting the needs of long-term storage. Attached Figure Description

[0012] Figure 1 This is an electron microscope image of a PVC film containing calcium carbonate filler in Comparative Example 1 of the present invention before immersion in a 40% ferric chloride solution. Figure 2 This is an electron microscope image of a PVC film containing calcium carbonate filler, as described in Comparative Example 1 of this invention, after being immersed in a 40% ferric chloride solution for 7 days. Figure 3 Electron micrograph of a PVC film containing barium sulfate filler before immersion in a 40% ferric chloride solution, as shown in Example 3 of this invention. Figure 4Electron micrograph of a PVC film containing barium sulfate filler after immersion in a 40% ferric chloride solution for 7 days, as shown in Example 3 of this invention. Figure 5 The image shows the penetration of a PVC material resistant to ferric chloride solution obtained in Example 3 of this invention after immersion in a 40% ferric chloride solution for 7 days (left); and the image shows the penetration of a PVC material resistant to ferric chloride solution obtained in Comparative Document 1 after immersion in a 40% ferric chloride solution for 7 days (right). Detailed Implementation

[0013] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0014] The key concept of this invention lies in the fact that, while existing technologies use calcium carbonate as a filler, this application uses barium sulfate as an equal substitute. This utilizes the mechanism that barium sulfate does not chemically react with ferric chloride solution (chemical stability), thus avoiding the reaction between ferric chloride solution and the filler, which could lead to corrosion of the PVC film.

[0015] Reaction mechanism: Hydrolysis reaction FeCl3 + 3H2O 3HCl + Fe(OH)3↓ Acid-base reaction: CaCO3 + 2HCl = CaCl2 + CO2↑ + H2O Calcium carbonate reacts with ferric chloride solution (which is acidic). As ferric hydroxide precipitate is formed and carbon dioxide gas is released, the internal structure of the PVC film is gradually destroyed. The PVC film is corroded by the ferric chloride solution, affecting the material properties.

[0016] Barium sulfate (BaSO4) is a chemically very stable inorganic salt, insoluble in water and common acid and alkali solutions, including ferric chloride solution. This chemical inertness allows barium sulfate to maintain its structural and property stability in a variety of chemical environments.

[0017] (2) Anti-wicking polyester fiber mesh is used instead of conventional polyester fiber mesh to reduce the possibility of ferric chloride solution penetrating from the fibers in the mesh.

[0018] Anti-permeability principle: The mesh fabric is woven using high-strength, low-shrinkage polyester fibers containing hydrophobic groups, giving the fabric excellent physical and hydrophobic properties. The polyester fiber mesh yarn undergoes an anti-wicking treatment, forming a layer of low surface energy hydrophobic groups on the fiber surface. This reduces the critical tension of the fiber surface, making it difficult for liquids (including water and various chemical solutions) to wet the fiber surface, effectively preventing initial penetration. If some solution manages to penetrate the surface coating, the tight structure and hydrophobic groups within the mesh further prevent the solution from diffusing and permeating within the fabric.

[0019] Example 1 A PVC material resistant to ferric chloride solution includes a PVC film and a mesh layer stacked sequentially. The PVC film is made from the following raw materials in the following weight ratios: 100 parts of PVC resin powder (ethylene method), 60 parts of diisononyl phthalate (DINP), 28 parts of barium sulfate, and 2.5 parts of barium zinc heat stabilizer.

[0020] The mesh layer is a polyester fiber mesh treated with anti-wicking properties.

[0021] The preparation method of the ferric chloride solution-resistant PVC material includes the following steps: (1) Mix PVC resin powder, diisononyl phthalate, barium sulfate and barium zinc stabilizer evenly according to the formula ratio, plasticize and melt them through a mixer and open mill, and calender the filtered mixture through a four-roll or five-roll calender to obtain PVC film by embossing and cooling. (2) The calendered PVC film and polyester fiber mesh are bonded together with an interface agent (after emulsion resin impregnation and drying) and then hot-pressed to obtain PVC material resistant to ferric chloride solution.

[0022] Before the polyester fiber mesh is laminated, the paste section on the mesh is subjected to an impregnation process. The mesh is first immersed in the paste in a paste tank, and then the paste is squeezed into the mesh gaps and yarns by pressing with upper and lower rollers. This ensures that the mesh yarns are completely filled with paste resin, further reducing the possibility of ferric chloride solution penetrating into the yarns and avoiding damage to the bonding strength between the yarns and PVC.

[0023] The anti-wicking process is as follows: Adding a waterproofing agent during the spinning process creates a layer of low surface energy hydrophobic groups on the fiber surface. The waterproof-treated yarn is then used to weave the mesh fabric, giving it hydrophobic properties.

[0024] Example 2 A PVC material resistant to ferric chloride solution includes a PVC film and a mesh layer stacked sequentially. The PVC film is made from the following raw materials in the following weight ratios: 100 parts of PVC resin powder (ethylene method), 63 parts of diisononyl phthalate (DINP), 27 parts of barium sulfate, and 3 parts of barium zinc heat stabilizer.

[0025] The mesh layer is a polyester fiber mesh treated with anti-wicking properties.

[0026] The preparation method of the ferric chloride solution-resistant PVC material includes the following steps: (1) Mix PVC resin powder, phthalate plasticizer, barium sulfate filler, heat stabilizer and other additives evenly according to the formula ratio, plasticize and melt them through a mixer and open mill, and calender the filtered mixture through a four-roll or five-roll calender to obtain PVC film by embossing and cooling. (2) The calendered PVC film and polyester fiber mesh are bonded together with an interface agent (after emulsion resin impregnation and drying) and then hot-pressed to obtain ferric chloride solution PVC storage material.

[0027] Example 3 A PVC material resistant to ferric chloride solution includes a PVC film and a mesh layer stacked sequentially. The PVC film is made from the following raw materials in the following weight ratios: 100 parts of PVC resin powder (ethylene method), 64 parts of diisononyl phthalate (DINP), 25 parts of barium sulfate, and 2 parts of barium zinc heat stabilizer.

[0028] The mesh layer is a polyester fiber mesh treated with anti-wicking properties.

[0029] The preparation method of the ferric chloride solution-resistant PVC material includes the following steps: (1) Mix PVC resin powder, phthalate plasticizer, barium sulfate filler, heat stabilizer and other additives evenly according to the formula ratio, plasticize and melt them through a mixer and open mill, and calender the filtered mixture through a four-roll or five-roll calender to obtain PVC film by embossing and cooling. (2) The calendered PVC film and polyester fiber mesh are bonded together with an interface agent (after emulsion resin impregnation and drying) and then hot-pressed to obtain ferric chloride solution PVC storage material.

[0030] Comparative Example 1 A PVC material comprising a PVC film and a mesh layer stacked sequentially; The PVC film is made from the following raw materials in the following weight ratios: 100 parts of PVC resin powder (ethylene method), 64 parts of diisononyl phthalate (DINP), 25 parts of calcium carbonate, and 2 parts of barium zinc heat stabilizer.

[0031] The mesh layer is made of polyester fiber.

[0032] The method for preparing the PVC material includes the following steps: (1) Mix PVC resin powder, phthalate plasticizer, calcium carbonate and barium zinc heat stabilizer evenly according to the formula ratio, plasticize and melt them through a mixer and open mill, and calender the filtered mixture through a four-roll or five-roll calender to obtain PVC film by embossing and cooling. (2) The calendered PVC film and polyester fiber mesh are bonded together with an interface agent (after emulsion resin impregnation and drying) and then hot-pressed to obtain ferric chloride solution PVC storage material.

[0033] Please see Figures 1 to 5 ; Figure 1 This is an electron microscope image of a PVC film containing calcium carbonate filler in Comparative Example 1 of the present invention before immersion in a 40% ferric chloride solution. Figure 2 This is an electron microscope image of a PVC film containing calcium carbonate filler, as described in Comparative Example 1 of this invention, after being immersed in a 40% ferric chloride solution for 7 days. Figure 3 Electron micrograph of a PVC film containing barium sulfate filler before immersion in a 40% ferric chloride solution, as shown in Example 3 of this invention. Figure 4 Electron micrograph of a PVC film containing barium sulfate filler after immersion in a 40% ferric chloride solution for 7 days, as shown in Example 3 of this invention. Figure 5 The images show the penetration of PVC material resistant to ferric chloride solution obtained in Example 3 of this invention after immersion in 40% ferric chloride solution for 7 days (left); and the penetration of PVC material resistant to ferric chloride solution obtained in Comparative Example 1 after immersion in 40% ferric chloride solution for 7 days (right).

[0034] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A PVC material resistant to ferric chloride solution, characterized in that, It includes a PVC film and a mesh layer stacked in sequence; The PVC film is made from the following raw materials in the following weight ratios: 90-110 parts PVC resin powder, 60-65 parts plasticizer, 25-30 parts filler and 2-3 parts heat stabilizer; the filler is barium sulfate.

2. The PVC material resistant to ferric chloride solution according to claim 1, characterized in that, The plasticizer is selected from one or more of phthalates and polyurethanes.

3. The PVC material resistant to ferric chloride solution according to claim 1, characterized in that, The heat stabilizer is selected from one or more of barium-zinc stabilizers and calcium-zinc stabilizers.

4. The PVC material resistant to ferric chloride solution according to claim 1, characterized in that, The mesh layer is an anti-wicking mesh.

5. The PVC material resistant to ferric chloride solution according to claim 1, characterized in that, The mesh fabric is made of polyester fiber.

6. The PVC material resistant to ferric chloride solution according to claim 1, characterized in that, The PVC film is specifically made from the following raw materials in the following weight ratio: 100 parts PVC resin powder, 63 parts plasticizer, 27 parts filler and 3 parts heat stabilizer.

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