A PVC chip protective film and its preparation method

Abstract

The present invention relates to a PVC chip protection film and a preparation method thereof, belonging to the technical field of polymer materials; the present invention uses polyvinyl chloride, plasticizer, ultrafine styrene-butadiene rubber, glycidyl methacrylate, internal lubricant, external lubricant, and reinforcing agent as raw materials to prepare a PVC chip protection film. The present invention first stirs and mixes each component raw material and then stands still, and then obtains a PVC chip protection film after plasticizing, calendering, peeling, cooling, and winding the mixed slurry; the preparation method of the PVC chip protection film of the present invention is simple, the ratio is controllable, it is easy to scale up, and the prepared PVC chip protection film has good heat resistance and low temperature resistance, can adapt to a more severe working environment, has good adhesion, and has good weather resistance and oil resistance, and is not easy to oxidize and swell and deform.

Description

Technical Field

[0001] The present invention belongs to the technical field of advanced petrochemical and chemical new materials. Specifically, it relates to a PVC chip protective film and a preparation method thereof. Background Art

[0002] To reduce the damage caused by external factors to the chip during production, transportation, and storage, a chip protective film is usually attached to the outer layer of the chip. The commonly used chip protective film on the market is a PVC chip protective film, which is made of materials such as chlorinated polyvinyl chloride plastic and rubber. The PVC chip protective film usually has good adhesion, can firmly adhere to the chip surface, and will not leave adhesive residue when it needs to be removed. Moreover, the PVC material has good chemical corrosion resistance, mechanical strength, and good transparency. However, due to the chemical properties of the PVC material itself, the thermal stability of the PVC material is poor. In an environment of light and oxygen, PVC will gradually age and embrittle, resulting in a decline in mechanical properties. Although antioxidants are added during the preparation of PVC, these antioxidants also have a service life, and small molecule antioxidants are prone to migration and failure. In addition, when the PVC material is subjected to long-term high-temperature action, it will cause the material to decompose, resulting in a deterioration of the product color, darkening, and a decline in physical properties. At low temperatures, the PVC material will also become brittle, with a decrease in toughness and prone to fracture. These defects limit the use environment of the PVC chip protective film. Based on this, the present invention provides a PVC chip protective film and a preparation method thereof. Summary of the Invention

[0003] The purpose of the present invention is to provide a PVC chip protective film and a preparation method thereof, which are used to solve the problems that in an environment of light and oxygen, PVC will gradually age and embrittle, resulting in a decline in mechanical properties. Although antioxidants are added during the preparation of PVC, these antioxidants also have a service life, and small molecule antioxidants are prone to migration and failure. In addition, when the PVC material is subjected to long-term high-temperature action, it will cause the material to decompose, resulting in a deterioration of the product color, darkening, and a decline in physical properties. At low temperatures, the PVC material will also become brittle, with a decrease in toughness and prone to fracture.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A PVC chip protective film comprises the following raw materials in parts by mass: 100 parts of polyvinyl chloride, 10 - 12 parts of plasticizer, 8 - 10 parts of ultrafine styrene-butadiene rubber, 2 - 3 parts of glycidyl methacrylate, 0.2 - 0.4 part of internal lubricant, 0.6 - 0.8 part of external lubricant, and 0.8 - 1 part of reinforcing agent;

[0006] A preparation method of a PVC chip protective film comprises the following steps:

[0007] Step 1: Weigh 100 parts of polyvinyl chloride, 10 - 12 parts of plasticizer, 8 - 10 parts of ultrafine styrene-butadiene rubber, 2 - 3 parts of glycidyl methacrylate, 0.2 - 0.4 parts of internal lubricant, 0.6 - 0.8 parts of external lubricant, and 0.8 - 1 part of reinforcing agent according to mass parts.

[0008] Step 2: Add all the raw materials into a blender, stir and mix evenly at room temperature, and let it stand for 12 h to obtain a mixed slurry.

[0009] Step 3: Add the mixed slurry into a planetary extruder for plasticization, then add it into a calender for calendering into a film, and obtain a PVC chip protective film after peeling, cooling, and winding.

[0010] Further, the polymer of the polyvinyl chloride is 1000 - 1200.

[0011] Further, the plasticizer is dilauryl phthalate.

[0012] Further, the internal lubricant is one of n-butyl stearate and stearamide.

[0013] Further, the external lubricant is one of pentaerythritol and neopentyl glycol.

[0014] Further, the stirring conditions in Step 2 are to stir at a speed of 150 - 200 rpm for 1 h, and then continue to stir at a speed of 250 - 350 rpm for 1 h.

[0015] Further, the plasticization temperature condition in Step 3 is 165 - 175 °C.

[0016] Further, the calendering temperature condition in Step 3 is 195 - 205 °C.

[0017] Further, the reinforcing agent is prepared by the following steps:

[0018] Step 1: Mix N-butylpyrazole, benzyl bromide, and acetonitrile in a three-necked flask, install a condenser and a thermometer, turn on magnetic stirring, and react at a temperature of 40 - 60 °C for 12 h. After the reaction is completed, rotary evaporation is carried out to obtain Intermediate 1.

[0019] Step 2: Mix Intermediate 1, potassium hexafluorophosphate, and deionized water in a three-necked flask, turn on magnetic stirring, and react at room temperature for 24 h. After the reaction is completed, vacuum filtration is carried out, and the obtained solid is washed with deionized water and then dried to obtain Intermediate 2.

[0020] Step 3: Mix 3-tert-butylsalicylaldehyde, 2-tert-butylphenol, aniline, intermediate 2, and absolute ethanol in a three-necked flask. Install a condenser and a thermometer, start magnetic stirring, and react at 70 - 80 °C for 6 h. After the reaction is completed, obtain the enhancer by silica gel column chromatography.

[0021] Further, the dosage ratio of N-butylpyrazole, benzyl bromide, and acetonitrile used in Step 1 is 20 - 25 mmol : 20 mmol : 20 - 30 mL.

[0022] Further, the dosage ratio of intermediate 1, potassium hexafluorophosphate, and deionized water used in Step 2 is 10 mmol : 10 mmol : 15 - 25 mL.

[0023] Further, the dosage ratio of 3-tert-butylsalicylaldehyde, 2-tert-butylphenol, aniline, intermediate 2, and absolute ethanol used in Step 3 is 5 mmol : 5 mmol : 5 mmol : 3 - 5 mmol : 10 - 20 mL.

[0024] Advantages of the present invention:

[0025] 1) The present invention uses polyvinyl chloride, a plasticizer, ultrafine styrene-butadiene rubber, glycidyl methacrylate, an internal lubricant, an external lubricant, and an enhancer as raw materials to prepare a PVC chip protection film. In the present invention, after stirring and mixing the raw material components and then standing, the mixed slurry is plastified, calendered, peeled, cooled, and wound to obtain a PVC chip protection film; in the present invention, ultrafine styrene-butadiene rubber with good cold resistance and a long-chain phthalate cold-resistant plasticizer are added to the raw materials to modify PVC, improving the low-temperature resistance of the prepared PVC composite material, enabling the prepared PVC chip protection film to adapt to a lower-temperature use environment. In addition, glycidyl methacrylate is added to the raw materials of the present invention, which can not only improve the oil resistance and adhesion performance of the PVC chip protection film, but also the epoxy group in glycidyl methacrylate can react with the imino group in the enhancer, enabling the enhancer to be combined with the composite material in the form of chemical bonds, thereby reducing the migration rate of the enhancer.

[0026] 2) The present invention uses N-butylpyrazole and benzyl bromide as raw materials. The intermediate 1 is obtained by the quaternary ammonium salt reaction of N-butylpyrazole and benzyl bromide. Then, using intermediate 1 and potassium hexafluorophosphate as raw materials, the intermediate 2 is obtained by the metathesis reaction of intermediate 1 and potassium hexafluorophosphate. Finally, using intermediate 2 as a catalyst, 3-tert-butylsalicylaldehyde, 2-tert-butylphenol, and aniline are used as raw materials to obtain an enhancer through the Betti reaction. Among them, the catalyst intermediate 2 used can be recycled; the enhancer of the present invention contains a hindered phenol group structure, has good antioxidant properties, and has a long-lasting effective time and is not easy to fail. In addition, the enhancer of the present invention contains a large number of benzene rings, which can enhance the rigidity of the PVC polymer molecular chain, improve the heat resistance of the PVC polymer, and enable the prepared PVC chip protective film to adapt to a higher temperature usage environment.

[0027] 3) The preparation method of a PVC chip protective film of the present invention is simple, the proportion can be controlled, it is easy to scale up, and the prepared PVC chip protective film has good heat resistance and low temperature resistance, can adapt to a more severe working environment, has good adhesion, and has good weather resistance and oil resistance, and is not easy to oxidize and swell and deform. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0029] Example 1

[0030] An enhancer is prepared by the following steps:

[0031] Step 1: Mix 20 mmol of N-butylpyrazole, 20 mmol of benzyl bromide, and 20 mL of acetonitrile in a three-necked flask, install a condenser and a thermometer, start magnetic stirring, and react at a temperature of 40 °C for 12 h. After the reaction is completed, rotary evaporation is carried out to obtain intermediate 1;

[0032] Step 2: Mix 10 mL of intermediate 1, 10 mL of potassium hexafluorophosphate, and 15 mL of deionized water in a three-necked flask, start magnetic stirring, and react at room temperature for 24 h. After the reaction is completed, vacuum filtration is carried out, and the obtained solid is washed with deionized water and then dried to obtain intermediate 2;

[0033] Step 3: Mix 5 mmol of 3-tert-butylsalicylaldehyde, 5 mmol of 2-tert-butylphenol, 5 mmol of aniline, 3 mmol of Intermediate 2, and 10 mL of absolute ethanol in a three-necked flask. Install a condenser and a thermometer, turn on magnetic stirring, and react at 70 °C for 6 h. After the reaction is completed, obtain the enhancer by silica gel column chromatography.

[0034] Example 2

[0035] An enhancer is prepared by the following steps:

[0036] Step 1: Mix 22.5 mmol of N-butylpyrazole, 20 mmol of benzyl bromide, and 25 mL of acetonitrile in a three-necked flask. Install a condenser and a thermometer, turn on magnetic stirring, and react at 50 °C for 12 h. After the reaction is completed, obtain Intermediate 1 by rotary evaporation.

[0037] Step 2: Mix 10 mL of Intermediate 1, 10 mL of potassium hexafluorophosphate, and 20 mL of deionized water in a three-necked flask. Turn on magnetic stirring and react at room temperature for 24 h. After the reaction is completed, perform vacuum filtration. Wash the obtained solid with deionized water and then dry it to obtain Intermediate 2.

[0038] Step 3: Mix 5 mmol of 3-tert-butylsalicylaldehyde, 5 mmol of 2-tert-butylphenol, 5 mmol of aniline, 4 mmol of Intermediate 2, and 15 mL of absolute ethanol in a three-necked flask. Install a condenser and a thermometer, turn on magnetic stirring, and react at 75 °C for 6 h. After the reaction is completed, obtain the enhancer by silica gel column chromatography.

[0039] Example 3

[0040] An enhancer is prepared by the following steps:

[0041] Step 1: Mix 25 mmol of N-butylpyrazole, 20 mmol of benzyl bromide, and 30 mL of acetonitrile in a three-necked flask. Install a condenser and a thermometer, turn on magnetic stirring, and react at 60 °C for 12 h. After the reaction is completed, obtain Intermediate 1 by rotary evaporation.

[0042] Step 2: Mix 10 mL of Intermediate 1, 10 mL of potassium hexafluorophosphate, and 25 mL of deionized water in a three-necked flask. Turn on magnetic stirring and react at room temperature for 24 h. After the reaction is completed, perform vacuum filtration. Wash the obtained solid with deionized water and then dry it to obtain Intermediate 2.

[0043] Step 3: Mix 5 mmol of 3-tert-butylsalicylaldehyde, 5 mmol of 2-tert-butylphenol, 5 mmol of aniline, 5 mmol of Intermediate 2, and 20 mL of absolute ethanol in a three-necked flask. Install a condenser and a thermometer, start magnetic stirring, and react at 80 °C for 6 h. After the reaction, the enhancer is obtained by silica gel column chromatography.

[0044] Example 4

[0045] A PVC chip protective film comprises the following raw materials in parts by mass: 100 parts of polyvinyl chloride, 10 parts of dilauryl phthalate, 8 parts of ultrafine styrene-butadiene rubber, 2 parts of glycidyl methacrylate, 0.2 part of n-butyl stearate, 0.6 part of pentaerythritol, and 0.8 part of the enhancer obtained in Example 1.

[0046] A preparation method of a PVC chip protective film comprises the following steps:

[0047] First step: Weigh each raw material according to 100 parts of polyvinyl chloride, 10 parts of dilauryl phthalate, 8 parts of ultrafine styrene-butadiene rubber, 2 parts of glycidyl methacrylate, 0.2 part of n-butyl stearate, 0.6 part of pentaerythritol, and 0.8 part of the enhancer obtained in Example 1 in parts by mass.

[0048] Second step: Add all the raw materials into a blender, stir at room temperature and a speed of 150 rpm for 1 h, then continue to stir at room temperature and a speed of 250 rpm for 1 h to mix evenly. After standing for 12 h, a mixed slurry is obtained.

[0049] Third step: Add the mixed slurry into a planetary extruder for plasticization, the plasticization temperature is 165 °C, then add it into a calender for calendering into a film, the calendering temperature is 195 °C, and a PVC chip protective film is obtained after peeling, cooling, and winding.

[0050] Among them, the polymer of the polyvinyl chloride used in this example is 1000.

[0051] Example 5

[0052] A PVC chip protective film comprises the following raw materials in parts by mass: 100 parts of polyvinyl chloride, 11 parts of dilauryl phthalate, 9 parts of ultrafine styrene-butadiene rubber, 2.5 parts of glycidyl methacrylate, 0.3 part of n-butyl stearate, 0.7 part of pentaerythritol, and 0.9 part of the enhancer obtained in Example 2.

[0053] A preparation method of a PVC chip protective film comprises the following steps:

[0054] Step 1: Weigh each raw material according to the following parts by mass: 100 parts of polyvinyl chloride, 11 parts of dilauryl phthalate, 9 parts of ultrafine styrene-butadiene rubber, 2.5 parts of glycidyl methacrylate, 0.3 part of n-butyl stearate, 0.7 part of pentaerythritol, and 0.9 part of the reinforcing agent obtained in Example 2;

[0055] Step 2: Add all the raw materials into a blender, stir at room temperature and a rotation speed of 175 rpm for 1 h, then continue to stir at room temperature and a rotation speed of 300 rpm for 1 h to mix evenly. After standing for 12 h, a mixed slurry is obtained;

[0056] Step 3: Add the mixed slurry into a planetary extruder for plasticization at a plasticization temperature of 170 °C, then add it into a calender for calendaring into a film at a calendering temperature of 200 °C. After peeling, cooling, and winding, a PVC chip protective film is obtained;

[0057] Among them, the polymer of polyvinyl chloride used in this example is 1100.

[0058] Example 6

[0059] A PVC chip protective film contains the following raw materials by mass: 100 parts of polyvinyl chloride, 12 parts of dilauryl phthalate, 10 parts of ultrafine styrene-butadiene rubber, 3 parts of glycidyl methacrylate, 0.4 part of stearic acid amide, 0.8 part of neopentyl glycol, and 1 part of the reinforcing agent obtained in Example 3;

[0060] A preparation method of a PVC chip protective film includes the following steps:

[0061] Step 1: Weigh each raw material according to the following parts by mass: 100 parts of polyvinyl chloride, 12 parts of dilauryl phthalate, 10 parts of ultrafine styrene-butadiene rubber, 3 parts of glycidyl methacrylate, 0.4 part of stearic acid amide, 0.8 part of neopentyl glycol, and 1 part of the reinforcing agent obtained in Example 3;

[0062] Step 2: Add all the raw materials into a blender, stir at room temperature and a rotation speed of 200 rpm for 1 h, then continue to stir at room temperature and a rotation speed of 350 rpm for 1 h to mix evenly. After standing for 12 h, a mixed slurry is obtained;

[0063] Step 3: Add the mixed slurry into a planetary extruder for plasticization at a plasticization temperature of 175 °C, then add it into a calender for calendaring into a film at a calendering temperature of 205 °C. After peeling, cooling, and winding, a PVC chip protective film is obtained;

[0064] Among them, the polymer of polyvinyl chloride used in this example is 1200.

[0065] Comparative Example 1

[0066] Remove the raw material "the reinforcing agent obtained in Example 3" used in Example 6, and keep the remaining raw materials and preparation steps unchanged.

[0067] A PVC chip protective film comprises the following raw materials in parts by mass: 100 parts of polyvinyl chloride, 12 parts of dilauryl phthalate, 10 parts of ultrafine styrene-butadiene rubber, 3 parts of glycidyl methacrylate, 0.4 part of stearic acid amide, and 0.8 part of neopentyl glycol.

[0068] A preparation method of a PVC chip protective film comprises the following steps:

[0069] First step: 100 parts of polyvinyl chloride, 12 parts of dilauryl phthalate, 10 parts of ultrafine styrene-butadiene rubber, 3 parts of glycidyl methacrylate, 0.4 part of stearic acid amide, and 0.8 part of neopentyl glycol in parts by mass;

[0070] Second step: Add all the raw materials into a blender, stir at room temperature and a rotation speed of 200 rpm for 1 h, then continue to stir at room temperature and a rotation speed of 350 rpm for 1 h to mix evenly, stand for 12 h, and obtain a mixed slurry;

[0071] Third step: Add the mixed slurry into a planetary extruder for plasticization, the plasticization temperature is 175 °C, then add it into a calender for calendering into a film, the calendering temperature is 205 °C, and obtain a PVC chip protective film after peeling, cooling, and winding;

[0072] Among them, the polymer of the polyvinyl chloride used in this example is 1200.

[0073] Comparative Example 2

[0074] This comparative example is a commercially available PVC chip protective film.

[0075] Experimental Example 1

[0076] Perform performance tests on a PVC chip protective film in Examples 4 - 6 and Comparative Example 1 and the commercially available PVC chip protective film in Comparative Example 2 together. Refer to GB / T 1040 - 2006 "Determination of Tensile Properties of Plastics" to test the tensile strength of each component chip protective film, and after oxidizing for 168 h at a temperature of 100 °C, repeat the test, and evaluate the antioxidant performance through the change rate of tensile properties before and after oxidation. The test results are shown in Table 1:

[0077] Table 1

[0078] Item Tensile strength / MPa Tensile strength after aging / MPa Change rate of tensile strength / % Example 1 28.93 24.26 14.32 Example 2 29.42 25.08 14.76 Example 3 30.17 25.58 15.21 Comparative Example 1 30.26 22.29 26.31 Comparative Example 2 26.21 19.70 24.82

[0079] As can be seen from Table 1, a PVC chip protective film of the present invention in Examples 4 - 6 has better tensile strength, and the change rate of tensile strength after oxidation is much lower than that of the commercially available PVC chip protective film, indicating that a PVC chip protective film of the present invention has better antioxidant performance. Although a PVC chip protective film in Comparative Example 1 also has good tensile strength, its antioxidant performance is not good because the self-made enhancer of the present invention is not added to the raw materials.

[0080] Experimental Example 2

[0081] A PVC chip protective film in Examples 4 - 6 and Comparative Example 1 and a commercially available PVC chip protective film in Comparative Example 2 were respectively subjected to heat resistance test and cold resistance test; for the heat resistance test, under nitrogen protection, a thermogravimetric analyzer was used to test the weight retention rate of each component chip protective film at a temperature of 200 °C. For the cold resistance test, each component chip protective film was placed in a low-temperature test chamber at a temperature of -40 °C for 1 h, then taken out and bent 180°, and the cracking situation of each component chip protective film was observed. The test results are shown in Table 2:

[0082] Table 2

[0083] Item Weight retention rate at 200 °C / % Low-temperature cracking situation Example 4 99.1 No cracks Example 5 99.3 No cracks Example 6 99.7 No cracks Comparative Example 1 92.3 No cracks Comparative Example 2 94.6 Obvious cracks

[0084] As can be seen from Table 2, a PVC chip protective film in Examples 4 - 6 and Comparative Example 1 did not show cracks after being bent after being placed in a low-temperature environment, indicating that a PVC chip protective film of the present invention has good cold resistance; the weight retention rate of a PVC chip protective film in Examples 4 - 6 at high temperature is much higher than that of the commercially available PVC chip protective film in Comparative Example 2, indicating that a PVC chip protective film of the present invention has good heat resistance. However, the weight retention rate of a PVC chip protective film in Comparative Example 1 is relatively low because the self-made enhancer of the present invention is not added to the raw materials. In summary, a PVC chip protective film of the present invention has good antioxidant performance and can adapt to the use environment of higher temperature and lower temperature, and can be widely used in the field of electronics industry.

[0085] The above has introduced in detail a PVC chip protective film and its preparation method provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention, including the best mode, and also enables any person skilled in the art to practice the present invention, including manufacturing and using any device or system, and implementing any combination method. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed by the present invention can be combined with each other in any way. The reason for not exhaustively describing these combinations in this specification is only to save space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A PVC chip protective film, characterized in that, It comprises raw materials in the following parts by mass: 100 parts of polyvinyl chloride, 10 - 12 parts of plasticizer, 8 - 10 parts of ultrafine styrene - butadiene rubber, 2 - 3 parts of glycidyl methacrylate, 0.2 - 0.4 part of internal lubricant, 0.6 - 0.8 part of external lubricant, and 0.8 - 1 part of reinforcing agent; Among them, the reinforcing agent is prepared by the following steps: Step 1: Mix N - n - butylpyrazole, benzyl bromide, and acetonitrile in a container. After stirring evenly, react at 40 - 60 °C for 12 h to obtain Intermediate 1; Step 2: Mix Intermediate 1, potassium hexafluorophosphate, and deionized water in a container. After stirring evenly, react at room temperature for 24 h to obtain Intermediate 2; Step 3: Mix 3 - tert - butylsalicylaldehyde, 2 - tert - butylphenol, aniline, Intermediate 2, and absolute ethanol in a container. After stirring evenly, react at 70 - 80 °C for 6 h to obtain the reinforcing agent.

2. A PVC chip protective film according to claim 1, characterized in that, The dosage ratio of N - n - butylpyrazole, benzyl bromide, and acetonitrile used in Step 1 is 20 - 25 mmol: 20 mmol: 20 - 30 mL.

3. A PVC chip protective film according to claim 1, characterized in that, The dosage ratio of Intermediate 1, potassium hexafluorophosphate, and deionized water used in Step 2 is 10 mmol: 10 mmol: 15 - 25 mL.

4. A PVC chip protective film according to claim 1, characterized in that, Furthermore, the dosage ratio of 3 - tert - butylsalicylaldehyde, 2 - tert - butylphenol, aniline, Intermediate 2, and absolute ethanol used in Step 3 is 5 mmol: 5 mmol: 5 mmol: 3 - 5 mmol: 10 - 20 mL.

5. A method for preparing a PVC chip protective film according to any one of claims 1-4, characterized in that, It includes the following steps: The first step: Weigh 100 parts of polyvinyl chloride, 10 - 12 parts of plasticizer, 8 - 10 parts of ultrafine styrene - butadiene rubber, 2 - 3 parts of glycidyl methacrylate, 0.2 - 0.4 part of internal lubricant, 0.6 - 0.8 part of external lubricant, and 0.8 - 1 part of reinforcing agent according to the parts by mass; The second step: Add all the raw materials into a blender and stir and mix evenly at room temperature. After standing for 12 h, a mixed slurry is obtained; The third step: Add the mixed slurry into a planetary extruder for plasticization, and then add it into a calender to calender into a film. After peeling, cooling, and winding, a PVC chip protective film is obtained.

6. The preparation method of a PVC chip protection film according to claim 5, wherein, The degree of polymerization of the polyvinyl chloride is 1000 - 1200.

7. The preparation method of a PVC chip protection film according to claim 5, characterized in that, The plasticizer is dilauryl phthalate. The internal lubricant is one of n - butyl stearate and stearic acid amide. The external lubricant is one of pentaerythritol and neopentyl glycol.

8. The preparation method of a PVC chip protection film according to claim 5, characterized in that, The stirring condition in the second step is to stir at 150 - 200 rpm for 1 h, and then continue to stir at 250 - 350 rpm for 1 h.

9. The preparation method of a PVC chip protection film according to claim 5, characterized in that, The temperature condition for plasticization in the third step is 165 - 175 °C.

10. The preparation method of a PVC chip protective film according to claim 5, characterized in that, The temperature condition for calendering in the third step is 195 - 205 °C.