PVC chip protective film and preparation method thereof

Abstract

The invention relates to a PVC chip protective film and a preparation method thereof, and belongs to the technical field of high polymer materials. The PVC chip protection film is prepared by taking polyvinyl chloride, a plasticizer, superfine butadiene styrene rubber, glycidyl methacrylate, an internal lubricant, an external lubricant and a reinforcing agent as raw materials, and the PVC chip protection film is obtained by firstly stirring and mixing the component raw materials and then standing, and then plasticizing, calendaring, stripping, cooling and rolling the mixed slurry. The preparation method of the PVC chip protection film is simple, the proportion is controllable, amplification is easy, and the prepared PVC chip protection film has good heat resistance and low temperature resistance, can adapt to a more stringent working environment, is good in cohesiveness, has good weather resistance and oil resistance and is not prone to oxidation and swelling deformation.

Description

Technical Field

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

[0002] In order to reduce the damage of external factors to the chip during production, transportation and storage, a chip protection film is usually attached to the outer layer of the chip. The commonly used chip protection film on the market is PVC chip protection film, which is made of chlorinated polyvinyl chloride plastic and rubber and other materials. The PVC chip protection film usually has good adhesion, can be firmly adhered to the surface of the chip, and will not leave adhesive residue when it needs to be removed. 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 the environment of light and oxygen, PVC will gradually age and become brittle, resulting in a decrease in mechanical properties. Although antioxidants are added to PVC during preparation, these antioxidants also have a service life, and small molecule antioxidants are prone to migration and failure. In addition, the PVC material will decompose the material when subjected to high temperature for a long time, causing the product color to deteriorate and darken, and the physical properties to decrease. At low temperatures, the PVC material will also become brittle, the toughness will decrease, and it will be easy to break. These defects limit the use environment of the PVC chip protection film. Based on this, the present invention provides a PVC chip protection film and a preparation method thereof. Summary of the invention

[0003] The purpose of the present invention is to provide a PVC chip protection film and a preparation method thereof, which are used to solve the problem that PVC will gradually age and become brittle in a light and oxygen environment, resulting in a decrease 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, PVC materials will decompose when subjected to high temperature for a long time, causing the product color to deteriorate and darken, and the physical properties to decrease. At low temperatures, PVC materials will also become brittle, the toughness will decrease, and they will be prone to breakage.

[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 weight: 100 parts of polyvinyl chloride, 10-12 parts of plasticizer, 8-10 parts of superfine 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 parts of reinforcing agent;

[0006] A method for preparing a PVC chip protective film comprises the following steps:

[0007] The first step is to weigh 100 parts of polyvinyl chloride, 10-12 parts of plasticizer, 8-10 parts of superfine 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 parts of reinforcing agent according to the mass proportions;

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

[0009] The third step is to add the mixed slurry into a planetary extruder for plasticization, and then add it into a calender for calendering into a film. After peeling, cooling and winding, a PVC chip protective film is obtained.

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

[0011] Furthermore, the plasticizer is dilauryl phthalate.

[0012] Furthermore, the internal lubricant is one of n-butyl stearate and stearic acid amide.

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

[0014] Furthermore, the stirring condition in the second step is stirring at a rotation speed of 150-200 rpm for 1 hour, and then stirring at a rotation speed of 250-350 rpm for another 1 hour.

[0015] Furthermore, the temperature condition of plasticization in the third step is 165-175°C.

[0016] Furthermore, the temperature condition of calendering in the third step is 195-205°C.

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

[0018] Step 1, N-butylpyrazole, benzyl bromide and acetonitrile were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 40-60° C. for 12 hours. After the reaction was completed, the intermediate 1 was obtained by rotary evaporation;

[0019] Step 2, intermediate 1, potassium hexafluorophosphate and deionized water were mixed in a three-necked flask, magnetic stirring was started, and the mixture was reacted for 24 hours at room temperature. After the reaction was completed, vacuum filtration was performed, and the obtained solid was washed with deionized water and dried to obtain intermediate 2;

[0020] Step 3: Mix 3-tert-butyl salicylaldehyde, 2-tert-butylphenol, aniline, intermediate 2 and anhydrous ethanol in a three-necked flask, install a condenser and a thermometer, turn on magnetic stirring, and react at a temperature of 70-80° C. for 6 hours. After the reaction is completed, the enhancer is obtained by silica gel column chromatography.

[0021] Furthermore, the amount ratio of N-n-butylpyrazole, benzyl bromide and acetonitrile used in step 1 is 20-25mmol:20mmol:20-30mL.

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

[0023] Furthermore, the amount ratio of 3-tert-butyl salicylaldehyde, 2-tert-butylphenol, aniline, intermediate 2 and anhydrous ethanol used in step 3 is 5mmol:5mmol:5mmol:3-5mmol:10-20mL.

[0024] Beneficial effects of the present invention:

[0025] 1) 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 protective film. The present invention first stirs and mixes the raw materials of each component and then allows them to stand, and then plasticizes, calenders, peels, cools and rolls the mixed slurry to obtain a PVC chip protective film; the present invention modifies PVC by adding ultrafine styrene-butadiene rubber with good cold resistance and long-chain phthalate cold-resistant plasticizer to the raw materials, thereby improving the low-temperature resistance of the prepared PVC composite material, so that the prepared PVC chip protective film can adapt to a use environment with a lower temperature. In addition, glycidyl methacrylate is also added to the raw materials of the present invention, which can not only improve the oil resistance and bonding performance of the PVC chip protective film, but also the epoxy group in the glycidyl methacrylate can react with the imino group in the reinforcing agent, so that the reinforcing agent can be combined in the composite material in the form of a chemical bond, thereby reducing the mobility of the reinforcing agent.

[0026] 2) The present invention uses N-n-butylpyrazole and benzyl bromide as raw materials, utilizes N-n-butylpyrazole and benzyl bromide to react with quaternary ammonium salt to obtain intermediate 1, then uses intermediate 1 and potassium hexafluorophosphate as raw materials, utilizes intermediate 1 and potassium hexafluorophosphate to undergo double decomposition reaction to obtain intermediate 2, finally uses intermediate 2 as catalyst, uses 3-tert-butyl salicylaldehyde, 2-tert-butylphenol, and aniline as raw materials, and obtains a reinforcing agent through Betty reaction, wherein the catalyst intermediate 2 used can be recycled; the reinforcing agent of the present invention contains a hindered phenolic structure, has good antioxidant properties, and has a long effective time and is not easy to fail. In addition, the reinforcing agent of the present invention contains a large number of benzene rings, which can enhance the rigidity of the PVC polymer molecular chain and improve the heat resistance of the PVC polymer, so that the prepared PVC chip protection film can adapt to a higher temperature use environment.

[0027] 3) The preparation method of the PVC chip protection film of the present invention is simple, the proportion is controllable, and it is easy to scale up. The prepared PVC chip protection film has good heat resistance and low temperature resistance, can adapt to more stringent working environments, has good adhesion, and has good weather resistance and oil resistance, and is not easy to oxidize and swell and deform. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0029] Example 1

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

[0031] Step 1, 20mmol N-butylpyrazole, 20mmol benzyl bromide, and 20mL acetonitrile were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 40°C for 12h. After the reaction was completed, the intermediate 1 was obtained by rotary evaporation;

[0032] Step 2, 10 mL of intermediate 1, 10 mL of potassium hexafluorophosphate, and 15 mL of deionized water were mixed in a three-necked flask, magnetic stirring was turned on, and the reaction was carried out at room temperature for 24 hours. After the reaction was completed, vacuum filtration was performed, and the obtained solid was washed with deionized water and dried to obtain intermediate 2;

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

[0034] Example 2

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

[0036] Step 1, 22.5mmol N-butylpyrazole, 20mmol benzyl bromide, and 25mL acetonitrile were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 50°C for 12h. After the reaction was completed, the intermediate 1 was obtained by rotary evaporation;

[0037] Step 2, 10 mL of intermediate 1, 10 mL of potassium hexafluorophosphate, and 20 mL of deionized water were mixed in a three-necked flask, magnetic stirring was turned on, and the reaction was carried out at room temperature for 24 hours. After the reaction was completed, vacuum filtration was performed, and the obtained solid was washed with deionized water and dried to obtain intermediate 2;

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

[0039] Example 3

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

[0041] Step 1, 25mmol N-butylpyrazole, 20mmol benzyl bromide, and 30mL acetonitrile were mixed in a three-necked flask, a condenser and a thermometer were installed, magnetic stirring was turned on, and the reaction was carried out at a temperature of 60°C for 12h. After the reaction was completed, the intermediate 1 was obtained by rotary evaporation;

[0042] Step 2, 10 mL of intermediate 1, 10 mL of potassium hexafluorophosphate, and 25 mL of deionized water were mixed in a three-necked flask, magnetic stirring was turned on, and the reaction was carried out at room temperature for 24 hours. After the reaction was completed, vacuum filtration was performed, and the obtained solid was washed with deionized water and dried to obtain intermediate 2;

[0043] Step 3: Mix 5mmol 3-tert-butyl salicylaldehyde, 5mmol 2-tert-butylphenol, 5mmol aniline, 5mmol intermediate 2, and 20mL anhydrous ethanol in a three-necked flask, install a condenser and a thermometer, turn on the magnetic stirring, and react at a temperature of 80°C for 6h. After the reaction is completed, 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 weight: 100 parts of polyvinyl chloride, 10 parts of dilauryl phthalate, 8 parts of superfine styrene-butadiene rubber, 2 parts of glycidyl methacrylate, 0.2 parts of n-butyl stearate, 0.6 parts of pentaerythritol, and 0.8 parts of the reinforcing agent obtained in Example 1;

[0046] A method for preparing a PVC chip protective film comprises the following steps:

[0047] The first step is to weigh the raw materials by mass: 100 parts of polyvinyl chloride, 10 parts of dilauryl phthalate, 8 parts of superfine styrene-butadiene rubber, 2 parts of glycidyl methacrylate, 0.2 parts of n-butyl stearate, 0.6 parts of pentaerythritol, and 0.8 parts of the reinforcing agent obtained in Example 1;

[0048] Step 2: Add all the raw materials into a mixer, stir at room temperature and a speed of 150 rpm for 1 hour, then continue stirring at room temperature and a speed of 250 rpm for 1 hour to mix evenly, and let stand for 12 hours to obtain a mixed slurry;

[0049] The third step is to add the mixed slurry into a planetary extruder for plasticization at a plasticization temperature of 165°C, and then add it into a calender for calendering into a film at a calendering temperature of 195°C. After peeling, cooling, and winding, a PVC chip protective film is obtained;

[0050] The polymer of polyvinyl chloride used in this embodiment 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 superfine styrene-butadiene rubber, 2.5 parts of glycidyl methacrylate, 0.3 parts of n-butyl stearate, 0.7 parts of pentaerythritol, and 0.9 parts of the reinforcing agent obtained in Example 2;

[0053] A method for preparing a PVC chip protective film comprises the following steps:

[0054] The first step is to weigh the raw materials by mass: 100 parts of polyvinyl chloride, 11 parts of dilauryl phthalate, 9 parts of superfine styrene-butadiene rubber, 2.5 parts of glycidyl methacrylate, 0.3 parts of n-butyl stearate, 0.7 parts of pentaerythritol, and 0.9 parts 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 speed of 175 rpm for 1 hour, then continue stirring at room temperature and a speed of 300 rpm for 1 hour to mix evenly, and let stand for 12 hours to obtain a mixed slurry;

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

[0057] The polymer of polyvinyl chloride used in this embodiment is 1100.

[0058] Example 6

[0059] 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 superfine styrene-butadiene rubber, 3 parts of glycidyl methacrylate, 0.4 parts of stearic acid amide, 0.8 parts of neopentyl glycol, and 1 part of the reinforcing agent obtained in Example 3;

[0060] A method for preparing a PVC chip protective film comprises the following steps:

[0061] The first step is to weigh the raw materials by mass: 100 parts of polyvinyl chloride, 12 parts of dilauryl phthalate, 10 parts of superfine styrene-butadiene rubber, 3 parts of glycidyl methacrylate, 0.4 parts of stearic acid amide, 0.8 parts 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 speed of 200 rpm for 1 hour, then continue stirring at room temperature and a speed of 350 rpm for 1 hour to mix evenly, and let stand for 12 hours to obtain a mixed slurry;

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

[0064] The polymer of polyvinyl chloride used in this embodiment is 1200.

[0065] Comparative Example 1

[0066] The raw material "the reinforcing agent obtained in Example 3" used in Example 6 was removed, and the other raw materials and preparation steps remained unchanged.

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

[0068] A method for preparing a PVC chip protective film comprises the following steps:

[0069] The first step is to prepare, by mass, 100 parts of polyvinyl chloride, 12 parts of dilauryl phthalate, 10 parts of superfine styrene-butadiene rubber, 3 parts of glycidyl methacrylate, 0.4 parts of stearic acid amide and 0.8 parts of neopentyl glycol;

[0070] Step 2: Add all the raw materials into a blender, stir at room temperature and a speed of 200 rpm for 1 hour, then continue stirring at room temperature and a speed of 350 rpm for 1 hour to mix evenly, and let stand for 12 hours to obtain a mixed slurry;

[0071] The third step is to add the mixed slurry into a planetary extruder for plasticization at a plasticization temperature of 175°C, and then add it into a calender for calendering into a film at a calendering temperature of 205°C. After peeling, cooling, and winding, a PVC chip protective film is obtained;

[0072] The polymer of polyvinyl chloride used in this embodiment is 1200.

[0073] Comparative Example 2

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

[0075] Experimental Example 1

[0076] The performance tests were conducted on the PVC chip protection films in Examples 4-6 and Comparative Example 1 together with the commercially available PVC chip protection film in Comparative Example 2. The tensile strength of each component chip protection film was tested in accordance with GB / T 1040-2006 "Determination of tensile properties of plastics". After oxidation at 100°C for 168 hours, the test was repeated. The antioxidant performance was evaluated by the change rate of tensile properties before and after oxidation. The test results are shown in Table 1:

[0077] Table 1

[0078] project Tensile strength / MPa Tensile strength after aging / MPa Tensile strength change rate / % 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] It can be seen from Table 1 that the PVC chip protection 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 protection film, indicating that the PVC chip protection film of the present invention has better antioxidant performance, while the PVC chip protection film in Comparative Example 1 also has good tensile strength, but poor antioxidant performance, because the homemade enhancer of the present invention is not added to the raw materials.

[0080] Experimental Example 2

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

[0082] Table 2

[0083] project Weight retention at 200°C / % Low temperature cracking 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 There are obvious cracks

[0084] It can be seen from Table 2 that the PVC chip protection films in Examples 4-6 and Comparative Example 1 did not show cracks after being bent in a low temperature environment, indicating that the PVC chip protection film of the present invention has good cold resistance; the weight retention rate of the PVC chip protection films in Examples 4-6 under high temperature conditions is much higher than that of the commercially available PVC chip protection film in Comparative Example 2, indicating that the PVC chip protection film of the present invention has good heat resistance, while the weight retention rate of the PVC chip protection film in Comparative Example 1 is low because the homemade enhancer of the present invention is not added to the raw materials. In summary, the PVC chip protection film of the present invention has good antioxidant properties, can adapt to high and low temperature use environments, and can be widely used in the electronics industry.

[0085] The above is a detailed introduction to a PVC chip protective film and a preparation method thereof provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best mode, and also enables any technician in the field to practice the present invention, including the manufacture and use of any device or system, and the implementation of any combination method. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention can be combined with each other in any way. The reason why these combinations are not exhaustively described in this specification is only for the consideration of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A PVC chip protection film, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 10-12 parts of plasticizer, 8-10 parts of superfine 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 parts of reinforcing agent; Wherein, the reinforcing agent is prepared by the following steps: Step 1, N-butylpyrazole, benzyl bromide and acetonitrile are mixed in a container, stirred evenly, and reacted at a temperature of 40-60° C. for 12 h to obtain intermediate 1; Step 2, mixing intermediate 1, potassium hexafluorophosphate and deionized water in a container, stirring evenly, and reacting at room temperature for 24 hours to obtain intermediate 2; Step 3: Mix 3-tert-butyl salicylaldehyde, 2-tert-butylphenol, aniline, intermediate 2 and anhydrous ethanol in a container, stir evenly, and react at a temperature of 70-80° C. for 6 hours to obtain the enhancer.

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

3. A PVC chip protection 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 protection film according to claim 1, characterized in that: Furthermore, the amount ratio of 3-tert-butyl salicylaldehyde, 2-tert-butylphenol, aniline, intermediate 2, and anhydrous 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 to 4, characterized in that: The following steps are involved: The first step is to weigh 100 parts of polyvinyl chloride, 10-12 parts of plasticizer, 8-10 parts of superfine 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 parts of reinforcing agent according to the mass proportions; Step 2: Add all the raw materials into a blender, stir and mix evenly at room temperature, and let stand for 12 hours to obtain a mixed slurry; The third step is to add the mixed slurry into a planetary extruder for plasticization, and then add it into a calender for calendering into a film. After peeling, cooling and winding, a PVC chip protective film is obtained.

6. The method for preparing a PVC chip protective film according to claim 5, characterized in that: The polymer of the polyvinyl chloride is 1000-1200.

7. The method for preparing a PVC chip protective 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, and the external lubricant is one of pentaerythritol and neopentyl glycol.

8. The method for preparing a PVC chip protective film according to claim 5, characterized in that: The stirring condition in the second step is stirring at a rotation speed of 150-200 rpm for 1 hour, and then stirring at a rotation speed of 250-350 rpm for another 1 hour.

9. The method for preparing 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 method for preparing a PVC chip protection film according to claim 5, characterized in that: The temperature condition for calendering in the third step is 195-205°C.