Acid-corrosion-resistant PVC (polyvinyl chloride) composition and application thereof

Abstract

The invention relates to the technical field of semiconductors, in particular to an acid-corrosion-resistant PVC composition and application thereof. The PVC film comprises a PVC film, and the PVC film is prepared from the following raw materials in parts by mass: 90-110 parts of modified PVC powder, 4-6 parts of calcium carbonate powder, 20-30 parts of DOP, 3-7 parts of epoxidized soybean oil, 2-3 parts of a liquid barium-zinc stabilizer 105, 0.2-0.5 part of a powdery barium-zinc stabilizer and 0.1-1.0 part of an amine compound. The acid-resistant film provided by the invention does not have the problem of acid seepage under the test conditions of 18% HF and 20H. The anti-acid film has good cohesiveness, acid resistance and overall stability, and no adhesive residue is left after the anti-acid film is used. The invention provides a systematic product. A composition which is excellent in bonding performance and free of residues is obtained by mixing a film and an adhesive.

Description

Technical Field

[0001] The invention relates to the technical field of semiconductors, and in particular to an acid-corrosion-resistant PVC composition and application thereof. Background Art

[0002] Glass etching thinning is a process that reduces the thickness of glass by chemical or physical means, and is commonly used in electronic devices, optical equipment, display screens, etc. This process can be achieved by chemical etching, mechanical grinding or laser technology, and the specific method varies depending on the application requirements.

[0003] Chemical etching: Utilizes the chemical reaction between acidic or alkaline solution and the glass surface to dissolve the material on the glass surface layer by layer, gradually reducing the thickness of the glass.

[0004] Commonly used chemicals: Hydrofluoric acid (HF): commonly used for chemical etching of glass, which can effectively dissolve silicon dioxide (SiO2) glass. Hydrogen fluoride gas (HF gas): can also be used for gas phase etching of glass, and is often used in more precise etching scenarios. Advantages: The etching process is gentle, suitable for processing large areas or thin glass, and can achieve high-precision thickness control. Disadvantages: Chemicals are corrosive and toxic, and strict protective measures are required during operation. Chemical etching is suitable for occasions that require fine processing and high requirements for surface roughness.

[0005] Acid-resistant film is a thin film material that can resist corrosion in acidic environments and is often used to protect the surface of materials from erosion by acidic substances. Acid-resistant films are usually used in chemical equipment, storage tanks, pipelines, building materials and other fields, especially in environments where acidic gases or liquids are present. Performance requirements of acid-resistant films: Chemical corrosion resistance: It can effectively resist the erosion of various acidic substances (such as sulfuric acid, hydrochloric acid, hydrofluoric acid, etc.). Good mechanical strength: When exposed to an acidic environment, the membrane material must still maintain its structural integrity. Thermal stability: Many acidic reaction environments are accompanied by high temperatures, and acid-resistant films need to have a certain degree of heat resistance. Durability and aging resistance: When exposed to acidic conditions for a long time, the membrane material should have good aging resistance.

[0006] Polyvinyl chloride (PVC) has a certain acid resistance, especially in low-concentration acid environments, but its acid resistance will be weakened when facing high-concentration acid, strong oxidizing acid or high-temperature acid environments. PVC has good tolerance in low-concentration inorganic acid environments (such as hydrochloric acid, sulfuric acid, and nitric acid) and is not prone to corrosion or degradation. Therefore, it is often used in pipes and containers for handling or storing dilute acid solutions. For some weak acids, such as acetic acid and citric acid, PVC also has good tolerance and can maintain its mechanical and physical properties for a long time. PVC has poor acid resistance when facing high-concentration strong acids (such as concentrated sulfuric acid and concentrated nitric acid). These acids will accelerate the degradation of PVC at higher temperatures, resulting in structural damage to the material and decreased mechanical properties. PVC is not resistant to strong oxidizing acids (such as fuming sulfuric acid and concentrated nitric acid) and certain mixed acids (such as aqua regia). Oxidizing acids not only corrode PVC, but may also cause PVC to decompose and release toxic gases.

[0007] In view of the above phenomenon, the present invention provides an acid corrosion resistant PVC composition and application thereof. Summary of the invention

[0008] In order to solve the above technical problems, the present invention provides an acid-corrosion-resistant PVC composition, comprising a PVC film. In parts by mass, the raw materials for preparing the PVC film include:

[0009] Modified PVC powder 90-110 parts

[0010] Calcium carbonate powder 4-6 parts

[0011] DOP 20~30 copies

[0012] Epoxidized soybean oil 3-7 parts

[0013] Liquid barium zinc stabilizer 105 2-3 parts

[0014] Powdered barium zinc stabilizer 0.2-0.5 parts

[0015] 0.1 to 1.0 part of amine compound.

[0016] As an embodiment of the present invention, the preparation method of the modified PVC powder is as follows:

[0017] PVC resin and PVDF resin are dry mixed in a dry mixer at a mass ratio of 8:1, the mixing time is 10 to 15 minutes, and the mixing temperature is 50 to 60°C;

[0018] The premixed powder is placed in a twin-screw extruder for melt blending; the extrusion temperature is 170°C to 210°C; the screw speed is 60 to 100 rpm;

[0019] The melt-blended material is extruded into strips through the extruder die head, and then enters the cooling water tank for rapid cooling and shaping. The cooled and shaped material is cut into granular modified PVC products by a pelletizer.

[0020] As an embodiment of the present invention, the particle size of the calcium carbonate powder is 1500-2000 mesh.

[0021] As an embodiment of the present invention, the amine compound is selected from one or more of tert-butylamine, isopropylamine, 2-ethylhexylamine, isobutylamine, triethanolamine, diisopropylamine, N-tert-butylethylenediamine, 2-amino-2-methyl-1-propanol, N,N-diisooctylamine, N,N-diisopropylethylamine and 2-tert-butylpropylamine.

[0022] As an embodiment of the present invention, the amine compound comprises N,N-diisooctylamine and N,N-diisopropylethylamine, and the mass ratio is 3:1.

[0023] As an embodiment of the present invention, the preparation method of the PVC film is as follows:

[0024] ① After mixing the raw materials for preparing the PVC film, send them into the internal mixer for pre-plasticization, and then send them to the extruder for repeated plasticization and plasticization; after continuous calendering, a film of a certain thickness is obtained, and then it is led out through the take-off roller;

[0025] ② Cool and solidify the film in a film cooler and maintain its required shape and performance;

[0026] ③ After the semi-finished product is tested and qualified, the trimming machine cuts it to the required width and length; then the film is rolled into a roll by the winder.

[0027] As an embodiment of the present invention, an adhesive layer and a release layer are also provided on the PVC film.

[0028] As an embodiment of the present invention, the raw material for preparing the adhesive layer is silicone adhesive.

[0029] As an embodiment of the present invention, an acid-corrosion-resistant PVC film is prepared from the composition.

[0030] As an embodiment of the present invention, the PVC film is applied to the field of glass etching.

[0031] By adopting the above technical solution, the present invention has the following beneficial effects:

[0032] The present invention provides an acid-resistant film, which does not have the problem of acid seepage in a 20H test condition (12H test is the basic requirement of the industry, and 20H test is the extreme requirement of the industry) at a concentration of 18% HF. The acid-resistant film has good adhesion and acid resistance, good overall stability, and no residual adhesive residue after use. The present invention provides a systemized product, which is obtained by mixing a film and an adhesive to obtain a composition with excellent adhesion performance and no residue. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be 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.

[0034] The present invention provides an acid-resistant PVC acid-resistant film, comprising a PVC film, an adhesive, and a release layer. In parts by mass, the raw materials for preparing the PVC film include:

[0035] Modified PVC powder 100 parts

[0036] 5 parts calcium carbonate powder

[0037] DOP 25 parts

[0038] Epoxidized soybean oil 5 parts

[0039] Liquid barium zinc stabilizer 105 2.5 parts

[0040] Powder barium zinc stabilizer 0.3 parts

[0041] 0.8 parts of amine compounds.

[0042] The preparation method of the modified PVC powder is as follows:

[0043] PVC resin and PVDF resin are dry mixed in a dry mixer at a mass ratio of 8:1, the mixing time is 10 to 15 minutes, and the mixing temperature is 50 to 60°C;

[0044] The premixed powder is placed in a twin-screw extruder for melt blending; the extrusion temperature is 170°C to 210°C; the screw speed is 60 to 100 rpm;

[0045] The melt-blended material is extruded into strips through the extruder die head, and then enters the cooling water tank for rapid cooling and shaping. The cooled and shaped material is cut into granular modified PVC products by a pelletizer.

[0046] The particle size of the calcium carbonate powder is 2000 meshes.

[0047] The amine compound comprises N,N-diisooctylamine (dioctylamine) and N,N-diisopropylethylamine, and the mass ratio is 3:1.

[0048] As an embodiment of the present invention, the preparation method of the PVC film is as follows:

[0049] ① After mixing the raw materials for preparing the PVC film, send them into the internal mixer for pre-plasticization, and then send them to the extruder for repeated plasticization and plasticization; after continuous calendering, a film of a certain thickness is obtained, and then it is led out through the take-off roller;

[0050] ② Cool and solidify the film in a film cooler and maintain its required shape and performance;

[0051] ③ After the semi-finished product is tested and qualified, the trimming machine cuts it to the required width and length; then the film is rolled into a roll by the winder.

[0052] The raw material for preparing the adhesive layer is Wacker Elastosil A07 silicone adhesive.

[0053] The release layer is a PET release film.

[0054] The thickness of the base film is 90 micrometers, the thickness of the adhesive layer is 15 micrometers, and the thickness of the release layer is 50 micrometers.

[0055] The preparation method of the PVC acid-resistant film comprises the following steps: cutting a PVC film of appropriate size, coating the adhesive layer material on the surface of the base film, drying the base film, and then laminating the release layer material to obtain the PVC acid-resistant film.

[0056] The molecular chain of PVC contains a large number of chlorine atoms, which makes it relatively unstable in certain acidic environments, especially when it comes into contact with certain strong acids (such as concentrated sulfuric acid and concentrated nitric acid). The acid will act on the chlorine atoms in PVC, causing the decomposition of PVC. PVC is usually improved in its flexibility by adding plasticizers, but these plasticizers may react with acids in an acidic environment, causing the plasticizers to be decomposed or lost. The loss of plasticizers will make PVC fragile and hardened, making it more prone to cracking or being corroded by acids. For this reason, the inventors found that the product obtained after modifying PVC is acid-resistant, but its surface after modification is smoother, which is easy to increase the difficulty of bonding with adhesives; at the same time, it is easy to increase the penetration of acidic solvents between the film layer and the adhesive layer during etching; for this reason, the present invention adds amine compounds to the preparation of raw materials to obtain a better bonding effect.

[0057] The present invention is further explained below in conjunction with specific implementation modes.

[0058] Example 1

[0059] The present embodiment provides an acid-resistant PVC acid-resistant film, comprising a PVC film, an adhesive, and a release layer. In parts by mass, the raw materials for preparing the PVC film include:

[0060] Modified PVC powder 100 parts

[0061] 5 parts calcium carbonate powder

[0062] DOP 25 parts

[0063] Epoxidized soybean oil 5 parts

[0064] Liquid barium zinc stabilizer 105 2.5 parts

[0065] Powder barium zinc stabilizer 0.3 parts

[0066] 0.8 parts of amine compounds.

[0067] The preparation method of the modified PVC powder is as follows:

[0068] PVC resin and PVDF resin were dry mixed in a dry mixer at a mass ratio of 8:1 for 15 minutes at a mixing temperature of 60°C.

[0069] The premixed powders were placed in a twin-screw extruder for melt blending; the extrusion temperature was 200°C; the screw speed was 100 rpm;

[0070] The melt-blended material is extruded into strips through the extruder die head, and then enters the cooling water tank for rapid cooling and shaping. The cooled and shaped material is cut into granular modified PVC products by a pelletizer.

[0071] The particle size of the calcium carbonate powder is 2000 meshes.

[0072] The amine compound comprises N,N-diisooctylamine (dioctylamine) and N,N-diisopropylethylamine, and the mass ratio is 3:1.

[0073] The preparation method of the PVC film is as follows:

[0074] ① After mixing the raw materials for preparing the PVC film, send them into the internal mixer for pre-plasticization, and then send them to the extruder for repeated plasticization and plasticization; after continuous calendering, a film of a certain thickness is obtained, and then it is led out through the take-off roller;

[0075] ② Cool and solidify the film in a film cooler and maintain its required shape and performance;

[0076] ③ After the semi-finished product is tested and qualified, the trimming machine cuts it to the required width and length; then the film is rolled into a roll by the winder.

[0077] The raw material for preparing the adhesive layer is Wacker Elastosil A07 silicone adhesive.

[0078] The release layer is a PET release film.

[0079] The thickness of the base film is 90 micrometers, the thickness of the adhesive layer is 15 micrometers, and the thickness of the release layer is 50 micrometers.

[0080] The preparation method of the PVC acid-resistant film comprises the following steps: cutting a PVC film of appropriate size, coating the adhesive layer material on the surface of the base film, drying the base film, and then laminating the release layer material to obtain the PVC acid-resistant film.

[0081] Example 2

[0082] The present embodiment provides an acid-resistant PVC acid-resistant film, comprising a PVC film, an adhesive, and a release layer. In parts by mass, the raw materials for preparing the PVC film include:

[0083] PVC powder 100 parts

[0084] 5 parts calcium carbonate powder

[0085] DOP 25 parts

[0086] Epoxidized soybean oil 5 parts

[0087] Liquid barium zinc stabilizer 105 2.5 parts

[0088] Powder barium zinc stabilizer 0.3 parts

[0089] 0.8 parts of amine compounds.

[0090] The particle size of the calcium carbonate powder is 2000 meshes.

[0091] The amine compound comprises N,N-diisooctylamine (dioctylamine) and N,N-diisopropylethylamine, and the mass ratio is 3:1.

[0092] The preparation method of the PVC film is as follows:

[0093] ① After mixing the raw materials for preparing the PVC film, send them into the internal mixer for pre-plasticization, and then send them to the extruder for repeated plasticization and plasticization; after continuous calendering, a film of a certain thickness is obtained, and then it is led out through the take-off roller;

[0094] ② Cool and solidify the film in a film cooler and maintain its required shape and performance;

[0095] ③ After the semi-finished product is tested and qualified, the trimming machine cuts it to the required width and length; then the film is rolled into a roll by the winder.

[0096] The raw material for preparing the adhesive layer is Wacker Elastosil A07 silicone adhesive.

[0097] The release layer is a PET release film.

[0098] The thickness of the base film is 90 micrometers, the thickness of the adhesive layer is 15 micrometers, and the thickness of the release layer is 50 micrometers.

[0099] The preparation method of the PVC acid-resistant film comprises the following steps: cutting a PVC film of appropriate size, coating the adhesive layer material on the surface of the base film, drying the base film, and then laminating the release layer material to obtain the PVC acid-resistant film.

[0100] Example 3

[0101] The invention provides an acid-resistant PVC acid-resistant film, comprising a PVC film, an adhesive, and a release layer. In parts by mass, the raw materials for preparing the PVC film include:

[0102] Modified PVC powder 100 parts

[0103] 5 parts calcium carbonate powder

[0104] DOP 25 parts

[0105] Epoxidized soybean oil 5 parts

[0106] Liquid barium zinc stabilizer 105 2.5 parts

[0107] Powder barium zinc stabilizer 0.3 parts

[0108] 0.8 parts of amine compounds.

[0109] The preparation method of the modified PVC powder is as follows:

[0110] PVC resin and PVDF resin were dry mixed in a dry mixer at a mass ratio of 8:1 for 15 minutes at a mixing temperature of 60°C.

[0111] The premixed powders were placed in a twin-screw extruder for melt blending; the extrusion temperature was 200°C; the screw speed was 100 rpm;

[0112] The melt-blended material is extruded into strips through the extruder die head, and then enters the cooling water tank for rapid cooling and shaping. The cooled and shaped material is cut into granular modified PVC products by a pelletizer.

[0113] The particle size of the calcium carbonate powder is 1000 mesh.

[0114] The amine compound comprises N,N-diisooctylamine (dioctylamine) and N,N-diisopropylethylamine, and the mass ratio is 3:1.

[0115] The preparation method of the PVC film is as follows:

[0116] ① After mixing the raw materials for preparing the PVC film, send them into the internal mixer for pre-plasticization, and then send them to the extruder for repeated plasticization and plasticization; after continuous calendering, a film of a certain thickness is obtained, and then it is led out through the take-off roller;

[0117] ② Cool and solidify the film in a film cooler and maintain its required shape and performance;

[0118] ③ After the semi-finished product is tested and qualified, the trimming machine cuts it to the required width and length; then the film is rolled into a roll by the winder.

[0119] The raw material for preparing the adhesive layer is Wacker Elastosil A07 silicone adhesive.

[0120] The release layer is a PET release film.

[0121] The thickness of the base film is 90 micrometers, the thickness of the adhesive layer is 15 micrometers, and the thickness of the release layer is 50 micrometers.

[0122] The preparation method of the PVC acid-resistant film comprises the following steps: cutting a PVC film of appropriate size, coating the adhesive layer material on the surface of the base film, drying the base film, and then laminating the release layer material to obtain the PVC acid-resistant film.

[0123] Example 4

[0124] The present embodiment provides an acid-resistant PVC acid-resistant film, comprising a PVC film, an adhesive, and a release layer. In parts by mass, the raw materials for preparing the PVC film include:

[0125] Modified PVC powder 100 parts

[0126] 5 parts calcium carbonate powder

[0127] DOP 25 parts

[0128] Epoxidized soybean oil 5 parts

[0129] Liquid barium zinc stabilizer 105 2.5 parts

[0130] Powder barium zinc stabilizer 0.3 parts

[0131] 0.8 parts of amine compounds.

[0132] The preparation method of the modified PVC powder is as follows:

[0133] PVC resin and PVDF resin were dry mixed in a dry mixer at a mass ratio of 8:1 for 15 minutes at a mixing temperature of 60°C.

[0134] The premixed powders were placed in a twin-screw extruder for melt blending; the extrusion temperature was 200°C; the screw speed was 100 rpm;

[0135] The melt-blended material is extruded into strips through the extruder die head, and then enters the cooling water tank for rapid cooling and shaping. The cooled and shaped material is cut into granular modified PVC products by a pelletizer.

[0136] The particle size of the calcium carbonate powder is 2000 meshes.

[0137] The amine compound is triethanolamine.

[0138] The preparation method of the PVC film is as follows:

[0139] ① After mixing the raw materials for preparing the PVC film, send them into the internal mixer for pre-plasticization, and then send them to the extruder for repeated plasticization and plasticization; after continuous calendering, a film of a certain thickness is obtained, and then it is led out through the take-off roller;

[0140] ② Cool and solidify the film in a film cooler and maintain its required shape and performance;

[0141] ③ After the semi-finished product is tested and qualified, the trimming machine cuts it to the required width and length; then the film is rolled into a roll by the winder.

[0142] The raw material for preparing the adhesive layer is Wacker Elastosil A07 silicone adhesive.

[0143] The release layer is a PET release film.

[0144] The thickness of the base film is 90 micrometers, the thickness of the adhesive layer is 15 micrometers, and the thickness of the release layer is 50 micrometers.

[0145] The preparation method of the PVC acid-resistant film comprises the following steps: cutting a PVC film of appropriate size, coating the adhesive layer material on the surface of the base film, drying the base film, and then laminating the release layer material to obtain the PVC acid-resistant film.

[0146] Example 5

[0147] The invention provides an acid-resistant PVC acid-resistant film, comprising a PVC film, an adhesive, and a release layer. In parts by mass, the raw materials for preparing the PVC film include:

[0148] Modified PVC powder 100 parts

[0149] 5 parts calcium carbonate powder

[0150] DOP 25 parts

[0151] Epoxidized soybean oil 5 parts

[0152] Liquid barium zinc stabilizer 105 2.5 parts

[0153] Powder barium zinc stabilizer 0.3 parts

[0154] The preparation method of the modified PVC powder is as follows:

[0155] PVC resin and PVDF resin were dry mixed in a dry mixer at a mass ratio of 8:1 for 15 minutes at a mixing temperature of 60°C.

[0156] The premixed powders were placed in a twin-screw extruder for melt blending; the extrusion temperature was 200°C; the screw speed was 100 rpm;

[0157] The melt-blended material is extruded into strips through the extruder die head, and then enters the cooling water tank for rapid cooling and shaping. The cooled and shaped material is cut into granular modified PVC products by a pelletizer.

[0158] The particle size of the calcium carbonate powder is 2000 meshes.

[0159] The preparation method of the PVC film is as follows:

[0160] ① After mixing the raw materials for preparing the PVC film, send them into the internal mixer for pre-plasticization, and then send them to the extruder for repeated plasticization and plasticization; after continuous calendering, a film of a certain thickness is obtained, and then it is led out through the take-off roller;

[0161] ② Cool and solidify the film in a film cooler and maintain its required shape and performance;

[0162] ③ After the semi-finished product is tested and qualified, the trimming machine cuts it to the required width and length; then the film is rolled into a roll by the winder.

[0163] The raw material for preparing the adhesive layer is Wacker Elastosil A07 silicone adhesive.

[0164] The release layer is a PET release film.

[0165] The thickness of the base film is 90 micrometers, the thickness of the adhesive layer is 15 micrometers, and the thickness of the release layer is 50 micrometers.

[0166] The preparation method of the PVC acid-resistant film comprises the following steps: cutting a PVC film of appropriate size, coating the adhesive layer material on the surface of the base film, drying the base film, and then laminating the release layer material to obtain the PVC acid-resistant film.

[0167] Example 6

[0168] The invention provides an acid-resistant PVC acid-resistant film, comprising a PVC film, an adhesive, and a release layer. In parts by mass, the raw materials for preparing the PVC film include:

[0169] Modified PVC powder 100 parts

[0170] 5 parts calcium carbonate powder

[0171] DOP 25 parts

[0172] Epoxidized soybean oil 5 parts

[0173] Liquid barium zinc stabilizer 105 2.5 parts

[0174] Powder barium zinc stabilizer 0.3 parts

[0175] 0.8 parts of amine compounds.

[0176] The preparation method of the modified PVC powder is as follows:

[0177] PVC resin and PVDF resin were dry mixed in a dry mixer at a mass ratio of 8:1 for 15 minutes at a mixing temperature of 60°C.

[0178] The premixed powders were placed in a twin-screw extruder for melt blending; the extrusion temperature was 200°C; the screw speed was 100 rpm;

[0179] The melt-blended material is extruded into strips through the extruder die head, and then enters the cooling water tank for rapid cooling and shaping. The cooled and shaped material is cut into granular modified PVC products by a pelletizer.

[0180] The particle size of the calcium carbonate powder is 2000 meshes.

[0181] The amine compound comprises N,N-diisooctylamine (dioctylamine) and N,N-diisopropylethylamine, and the mass ratio is 3:1.

[0182] As an embodiment of the present invention, the preparation method of the PVC film is as follows:

[0183] ① After mixing the raw materials for preparing the PVC film, send them into the internal mixer for pre-plasticization, and then send them to the extruder for repeated plasticization and plasticization; after continuous calendering, a film of a certain thickness is obtained, and then it is led out through the take-off roller;

[0184] ② Cool and solidify the film in a film cooler and maintain its required shape and performance;

[0185] ③ After the semi-finished product is tested and qualified, the trimming machine cuts it to the required width and length; then the film is rolled into a roll by the winder.

[0186] The raw material for preparing the adhesive layer is silicone adhesive, specifically Loctite SI 5140.

[0187] The release layer is a PET release film.

[0188] The thickness of the base film is 90 micrometers, the thickness of the adhesive layer is 15 micrometers, and the thickness of the release layer is 50 micrometers.

[0189] The preparation method of the PVC acid-resistant film comprises the following steps: cutting a PVC film of appropriate size, coating the adhesive layer material on the surface of the base film, drying the base film, and then laminating the release layer material to obtain the PVC acid-resistant film.

[0190] Performance Testing

[0191] 1. Acid resistance: Soak the acid-resistant film in 18% hydrofluoric acid for 20 hours and observe whether there is acid seepage and blistering. After cleaning the acid-resistant film, dry it naturally. The results are shown in Table 1.

[0192] Table 1 Acid resistance test results

[0193] Example Is there acid seepage or blistering? Example 1 No acid seepage, no blistering Example 2 No acid seepage, blistering Example 3 No acid seepage, blistering Example 4 No acid seepage, blistering Example 5 Acid oozing and bubbling Example 6 No acid seepage, blistering

[0194] 2. Residual glue test: Take 20 pieces of 10cm*10cm acid-resistant film prepared in the embodiment and stick them on the surface of ITO conductive glass to make it completely fit. After one week, tear off the acid-resistant film, observe the ITO conductive glass, and count the number of glass pieces with residual glue visible to the naked eye on the ITO conductive glass. The results are shown in Table 2.

[0195] Table 2 Residue test results

[0196] Example Number of glass blocks with residual glue Example 1 0 Example 2 0 Example 3 5 Example 4 7 Example 5 9 Example 6 9

[0197] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An acid-resistant PVC composition, characterized in that: The invention comprises a PVC film, wherein the raw materials for preparing the PVC film comprise, in parts by weight: Modified PVC powder 90-110 parts Calcium carbonate powder 4-6 parts DOP 20~30 copies Epoxidized soybean oil 3-7 parts Liquid barium zinc stabilizer 105 2-3 parts Powdered barium zinc stabilizer 0.2-0.5 parts 0.1 to 1.0 part of amine compound.

2. The acid-resistant PVC composition according to claim 1, characterized in that: The preparation method of the modified PVC powder is as follows: PVC resin and PVDF resin are dry mixed in a dry mixer at a mass ratio of 8:1, the mixing time is 10 to 15 minutes, and the mixing temperature is 50 to 60°C; The premixed powder is placed in a twin-screw extruder for melt blending; the extrusion temperature is 170°C to 210°C; the screw speed is 60 to 100 rpm; The melt-blended material is extruded into strips through the extruder die head, and then enters the cooling water tank for rapid cooling and shaping. The cooled and shaped material is cut into granular modified PVC products by a pelletizer.

3. The acid-resistant PVC composition according to claim 1, characterized in that: The particle size of the calcium carbonate powder is 1500-2000 meshes.

4. The acid-resistant PVC composition according to claim 1, characterized in that: The amine compound is selected from one or more of tert-butylamine, isopropylamine, 2-ethylhexylamine, isobutylamine, triethanolamine, diisopropylamine, N-tert-butylethylenediamine, 2-amino-2-methyl-1-propanol, N,N-diisooctylamine, N,N-diisopropylethylamine and 2-tert-butylpropylamine.

5. The acid-resistant PVC composition according to claim 1, characterized in that: The amine compound comprises N,N-diisooctylamine and N,N-diisopropylethylamine, and the mass ratio is 3:

1.

6. The acid-resistant PVC composition according to claim 1, characterized in that: The preparation method of the PVC film is as follows: ① After mixing the raw materials for preparing the PVC film, send them into the internal mixer for pre-plasticization, and then send them to the extruder for repeated plasticization and plasticization; after continuous calendering, a film of a certain thickness is obtained, and then it is led out through the take-off roller; ② Cool and solidify the film in a film cooler and maintain its required shape and performance; ③ After the semi-finished product is tested and qualified, the trimming machine cuts it to the required width and length; then the film is rolled into a roll by the winder.

7. The acid-resistant PVC composition according to claim 1, characterized in that: The PVC film is also provided with an adhesive layer and a release layer.

8. The acid-resistant PVC composition according to claim 7, characterized in that: The raw material for preparing the adhesive layer is silicone glue.

9. An acid-resistant PVC film, characterized in that: Prepared from the composition according to any one of claims 1 to 8.

10. The PVC film according to claim 9, characterized in that: Used in the field of glass etching.