PVC (polyvinyl chloride) blue protective film and preparation method thereof

Abstract

The invention discloses a PVC blue protective film and a preparation method thereof. The PVC blue protective film comprises a release layer, a blue PVC base film, a priming coat and a pressure-sensitive adhesive layer which are sequentially arranged from top to bottom. The release layer and the priming coat are respectively designed on the two surfaces of the blue PVC base film, a direct coating and direct collecting process mode is adopted, an additional release film does not need to be used, the preparation process is simplified, the production cost is reduced, meanwhile, a plasticizer in the blue PVC base film can be sealed, and the plasticizer is effectively prevented from being separated out; a direct coating process instead of a transfer coating process is adopted, and the base coating is used for clamping, so that the binding strength of the pressure-sensitive adhesive layer and the blue PVC base film is better; the pressure-sensitive adhesive layer adopts a slit coating technology, so that the coating thickness is more uniform, rolling is not easy to occur, and the stability of product quality is improved; the resin in the bottom coating can react with the isocyanate curing agent in the pressure-sensitive adhesive layer, and the resin in the pressure-sensitive adhesive layer can also react with the isocyanate curing agent in the bottom coating, so that the bonding force between the layers is enhanced.

Description

Technical Field

[0001] This invention belongs to the field of PVC protective film technology, specifically relating to a blue PVC protective film and its preparation method. Background Technology

[0002] With the rapid development of the semiconductor industry, wafer dicing protective films, as an important auxiliary material in the semiconductor manufacturing process, have received increasing attention for their performance and manufacturing process. Wafer dicing protective films are mainly used to protect the wafer surface during the wafer dicing process, preventing contamination and damage from debris, dust, and other contaminants generated during dicing. Currently, commonly used wafer dicing protective films on the market mainly include PVC blue protective film and PET-based UV anti-adhesion protective film.

[0003] In existing technologies, PVC blue protective film is widely used in wafer dicing processes due to its good visibility and certain protective properties. For example, Chinese invention patent publication number CN112795323A discloses an antistatic semiconductor chip dicing protective film. This protective film includes an antistatic release coating, a PVC blue film, a blue film protective primer, and an antistatic acrylic adhesive layer. It features good flexibility, high temperature resistance, and ease of wafer expansion and dicing. Another example is Chinese invention patent publication number CN112574681A, which discloses a PVC protective film and its preparation method. This protective film has a glossy surface with a non-silicon release layer on one side and a matte surface with an isolation coating on the other side. An acrylic adhesive layer is placed on the isolation coating, which can improve the cleanliness of the wafer surface. Regarding the adhesive layer formulation of the protective film, Chinese invention patent, publication number CN108707432A, discloses a high-temperature resistant and ultraviolet-resistant protective film and its preparation method. The adhesive layer of the protective film is formed by coating a heat-resistant and ultraviolet-resistant pressure-sensitive adhesive onto the surface of a PE base film layer and then drying it. The pressure-sensitive adhesive includes components such as acrylate resin, ethyl acetate, and isocyanate curing agent.

[0004] However, existing PVC blue protective films still have some technical problems. First, conventional PVC blue protective films have poor temperature resistance and are prone to deformation in high-temperature environments, affecting their protective effect. Second, plasticizers in PVC blue protective films are prone to leaching and seeping into the adhesive layer, leading to a decline in adhesive layer performance. More seriously, most existing technical solutions use PET release film to transfer the PVC blue protective film, which has two significant drawbacks: first, it easily leads to poor adhesion between the adhesive layer and the PVC blue protective film, causing adhesive peeling during the peeling process; second, the transfer method requires an additional release film, increasing both material costs and process complexity. These problems seriously affect the application effect and economic efficiency of PVC blue protective films in the wafer dicing process.

[0005] Therefore, there is an urgent need to develop a new type of PVC blue protective film and its preparation method, which can solve the material problems of poor temperature resistance and plasticizer precipitation of PVC blue protective film, and avoid the disadvantages of poor adhesion and high cost caused by transfer coating method, thereby improving the application effect of PVC blue protective film in wafer cutting process. Summary of the Invention

[0006] To address the problems in the prior art, the present invention aims to provide a PVC blue protective film and its preparation method.

[0007] To achieve the above objectives and technical effects, the technical solution adopted by this invention is as follows: A blue PVC protective film includes, from top to bottom, a release layer, a blue PVC base film, a base coating layer, and a pressure-sensitive adhesive layer.

[0008] Furthermore, the raw materials for preparing the base coating include the following components in parts by weight: 100 parts of water-based hydroxyl polyacrylate emulsion 10-20 parts of waterborne polyurethane resin emulsion 2-5 parts of water-based curing agent Aziridine crosslinking agent (such as BASF XAMA-7) 0.5 to 2 parts 3-8 parts of SiO2 nanosol 20-30 parts deionized water.

[0009] Furthermore, the water-based curing agent is a water-based isocyanate curing agent, such as Covestro 2655, 3100, Asahi Kasei WT30-100, etc.

[0010] Furthermore, the raw materials for preparing the pressure-sensitive adhesive layer include the following components in parts by weight: 100-120 parts of butyl acrylate 80-100 parts of isooctyl acrylate 20-40 parts of methyl methacrylate 3-5 parts glycidyl methacrylate 12-16 parts of hydroxyethyl methacrylate 5-10 parts acrylic acid 10-30 parts of ethylene-vinyl acetate copolymer resin 5-15 parts of hydrogenated styrene-butadiene block copolymer Initiator 0.5–1.2 parts 2-20 parts of curing agent Solvent: 280-600 parts.

[0011] Furthermore, the solvent is a mixture of ethyl acetate, toluene, and isopropanol.

[0012] Furthermore, the curing agent is a polyisocyanate curing agent, such as Covestro N3390, L75, N75, etc.

[0013] Furthermore, the raw materials for preparing the blue PVC base film include the following components in parts by weight: 100 parts of PVC resin 30-50 parts plasticizer Antistatic agent 0.8-2 parts 1-3 parts of nano thermally conductive filler 2-3 parts calcium-zinc stabilizer.

[0014] Furthermore, the release layer is made by coating and drying a non-silicone release agent, which is a wax emulsion composed of PP wax, OP wax, and fluorocarbon surfactant.

[0015] Furthermore, the thickness of the release layer is 1-2 μm, the release force is 0.03-0.2 N / 25 mm, the thickness of the blue PVC base film is 50-100 μm, the thickness of the base layer is 1-2 μm, and the thickness of the pressure-sensitive adhesive layer is 10-30 μm.

[0016] This invention also discloses a method for preparing a blue PVC protective film, comprising the following steps: (1) Prepare the raw materials for the blue PVC base film according to the proportion, and melt co-extrude to obtain the blue PVC base film; (2) Coat one side of the blue PVC base film with a non-silicone release agent, dry and roll it up; (3) Prepare the raw materials for the preparation of the base layer according to the proportion, mix them evenly to obtain the base coating for coating, and then coat it on the other side of the blue PVC base film. Pre-dry it at 80-95℃ until it is surface dry. Coat the raw materials for the preparation of the pressure-sensitive adhesive layer on the base layer that is not fully cured within 15 seconds. Gradually increase the temperature at 95-120℃ to dry it and form an integrated coating. (4) Roll it up and wrap it with stretch film, then cure it at 40-60℃ for 40-55 hours to finally obtain the desired PVC blue protective film.

[0017] Furthermore, in step (1), the melt co-extrusion temperature is 170-190℃: 170℃ in zone 1, 175℃ in zone 2, 180℃ in zone 3, 185℃ in zone 4, and 190℃ in the die head. The screw speed of the twin-screw extruder is 200-300 rpm, and the traction rate is 15-25 m / min. In step (3), the coating speed is 40-100 m / min.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) This invention designs a release layer and a base layer on both sides of the blue PVC base film, and adopts a direct coating and direct winding process, eliminating the need for an additional release film, simplifying the preparation process, reducing production costs, and simultaneously sealing the plasticizer in the blue PVC base film, effectively preventing plasticizer precipitation; the use of a direct coating process instead of a transfer coating process, and the addition of a base layer, results in better adhesion between the pressure-sensitive adhesive layer and the blue PVC base film, making it less prone to delamination or residue when the blue PVC base film is peeled off; the pressure-sensitive adhesive layer uses slit coating technology, resulting in a more uniform coating thickness, less likelihood of roll-up, and improved product quality stability; 2) The resin in the base coating of the present invention can react with the isocyanate curing agent in the pressure-sensitive adhesive layer, and the resin in the pressure-sensitive adhesive layer can also react with the isocyanate curing agent in the base coating. The two layers can cross-link with each other, which enhances the bonding force between the layers. By adding glycidyl methacrylate, it is beneficial to enhance the cross-linking density with the curing agent and improve the high temperature resistance. By adding aziridine cross-linking agent, it can work synergistically with the isocyanate curing agent to form an interpenetrating network and improve the solvent resistance. By adding SiO2 nano sol, it is beneficial to improve the wear resistance and adhesion of the base coating. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0020] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0021] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0022] like Figure 1 As shown, the present invention discloses a PVC blue protective film, comprising a release layer 4, a blue PVC base film 3, a base coating layer 2 and a pressure-sensitive adhesive layer 1 arranged sequentially from top to bottom.

[0023] In some embodiments, the raw materials for preparing the base coating 2 include the following components in parts by weight: 100 parts of water-based hydroxyl polyacrylate emulsion 10-20 parts of waterborne polyurethane resin emulsion 2-5 parts of water-based curing agent Aziridine crosslinking agent (such as BASF XAMA-7) 0.5 to 2 parts 3-8 parts of SiO2 nanosol 20-30 parts deionized water.

[0024] By adding aziridine crosslinking agent, which works synergistically with water-based curing agent to form interpenetrating network, solvent resistance is improved.

[0025] The wear resistance and adhesion of the base coating are improved by adding SiO2 nano-sol.

[0026] In some embodiments, the water-based curing agent is a water-based isocyanate curing agent, such as Covestro 2655, 3100, Asahi Kasei WT30-100, etc.

[0027] In some embodiments, the raw materials for preparing the pressure-sensitive adhesive layer 1 include the following components in parts by weight: 100-120 parts of butyl acrylate 80-100 parts of isooctyl acrylate 20-40 parts of methyl methacrylate 3-5 parts glycidyl methacrylate 12-16 parts of hydroxyethyl methacrylate 5-10 parts acrylic acid 10-30 parts of ethylene-vinyl acetate copolymer resin 5-15 parts of hydrogenated styrene-butadiene block copolymer Initiator 0.5–1.2 parts 2-20 parts of curing agent Solvent: 280-600 parts.

[0028] Adding glycidyl methacrylate can enhance the crosslinking density with the curing agent and improve high temperature resistance (>120℃).

[0029] Adding hydrogenated styrene-butadiene block copolymer improves the cold flow resistance of the adhesive layer and avoids adhesive overflow contaminating the wafer.

[0030] In some embodiments, the solvent is a mixture of ethyl acetate, toluene, and isopropanol.

[0031] In some implementations, the curing agent is a polyisocyanate curing agent, such as Covestro N3390, L75, N75, etc.

[0032] In some embodiments, the raw materials for preparing the blue PVC base film include the following components in parts by weight: 100 parts of PVC resin 30-50 parts plasticizer Antistatic agent 0.8-2 parts 1-3 parts of nano thermally conductive filler 2-3 parts calcium-zinc stabilizer.

[0033] The problem of electrostatic dust adsorption during wafer dicing can be solved by adding antistatic agents (such as quaternary ammonium salts or conductive polymers PEDOT, PSS, etc.).

[0034] By adding nano-thermal conductive fillers (such as boron nitride nanosheets), the cutting heat dissipation efficiency can be improved and thermal damage can be reduced.

[0035] In some embodiments, the release layer 4 is made by coating and drying a non-silicone release agent, which is a wax emulsion made by compounding PP wax, OP wax and fluorocarbon surfactant in a mass ratio of (50-70): (30-50): (0.1-0.5).

[0036] In some embodiments, the thickness of the release layer 4 is 1-2 μm, the release force is 0.03-0.2 N / 25 mm, the thickness of the blue PVC base film 3 is 50-100 μm, the thickness of the base layer 2 is 1-2 μm, and the thickness of the pressure-sensitive adhesive layer 1 is 10-30 μm.

[0037] This invention also discloses a method for preparing a blue PVC protective film, comprising the following steps: (1) Prepare the raw materials for the blue PVC base film 3 according to the proportion, and melt co-extrude to obtain the blue PVC base film 3; (2) On one side of the blue PVC base film 3, a non-silicone release agent is coated using a textured coating machine, dried and rolled up. The drying temperature is 80-110℃ and the coating machine speed is 60-100m / min. (3) Prepare the raw materials for the preparation of the base coating 2 according to the proportion, stir for 10-30 minutes to get the base coating for coating, then coat it on the other side of the blue PVC base film 3, pre-dry it at 80-95℃ until it is surface dry, coat the raw materials for the preparation of the pressure-sensitive adhesive layer on the base coating 2 that is not fully cured within 15 seconds, and dry it at 95-120℃ in a gradient temperature rise to form an integrated coating. (4) Roll up the film and wrap it with stretch film. Then cure it at 40-60℃ for 40-55 hours to finally obtain the desired PVC blue protective film. The curing process uses microencapsulated polyisocyanate curing agent.

[0038] Furthermore, in step (1), the melt co-extrusion temperature is 170-190℃: 170℃ in zone 1, 175℃ in zone 2, 180℃ in zone 3, 185℃ in zone 4, and 190℃ in the die head. The screw speed of the twin-screw extruder is 200-300 rpm, and the traction rate is 15-25 m / min. In step (3), the coating speed is 40-100 m / min.

[0039] The PVC blue protective film of the present invention has the following characteristics: 180° peel force range: 3~6N / 25mm; initial adhesion range: 5~6# ball; holding time: >168h under 1kg weight; unwinding force: 0.5~1N / 25mm; appearance: no bubbles, no roll-up; no residue after peeling.

[0040] Example 1 like Figure 1 As shown, a PVC blue protective film includes a release layer 4, a blue PVC base film 3, a base coating layer 2, and a pressure-sensitive adhesive layer 1 arranged sequentially from top to bottom.

[0041] The raw materials for preparing the base coating 2 include the following components in parts by weight: 100 parts of water-based hydroxyl polyacrylate emulsion 10 parts of waterborne polyurethane resin emulsion 2 parts water-based curing agent 0.5 parts of aziridine crosslinking agent (BASF XAMA-7) 3 parts of SiO2 nanosol 20 parts deionized water.

[0042] The water-based curing agent is a water-based isocyanate curing agent, model Covestro 2655.

[0043] The raw materials for preparing pressure-sensitive adhesive layer 1 include the following components in parts by weight: 100 parts butyl acrylate 100 parts of isooctyl acrylate 40 parts of methyl methacrylate 5 parts glycidyl methacrylate 16 parts of hydroxyethyl methacrylate 10 parts acrylic acid 30 parts of ethylene-vinyl acetate copolymer resin 15 parts of hydrogenated styrene-butadiene block copolymer 1.2 parts initiator 20 parts of curing agent 600 parts of solvent.

[0044] The solvent is a mixture of ethyl acetate, toluene, and isopropanol in a mass ratio of 6:3:1.

[0045] The curing agent is a polyisocyanate curing agent, model Covestro N3390.

[0046] The raw materials for preparing blue PVC base film include the following components in parts by weight: 100 parts of PVC resin 50 parts plasticizer 0.8 parts of antistatic agent 1 part of nano thermally conductive filler Two parts of calcium-zinc stabilizer.

[0047] Release layer 4 is made by coating and drying a non-silicone release agent, wherein the non-silicone release agent is a wax emulsion composed of PP wax, OP wax and fluorocarbon surfactant in a mass ratio of 50:50:0.5.

[0048] The release layer 4 has a thickness of 1μm and a release force of 0.03N / 25mm. The blue PVC base film 3 has a thickness of 50μm. The base coating layer 2 has a thickness of 1μm. The pressure-sensitive adhesive layer 1 has a thickness of 10μm.

[0049] A method for preparing a blue PVC protective film includes the following steps: (1) Prepare the raw materials for the blue PVC base film 3 according to the proportion, and melt co-extrude to obtain the blue PVC base film 3; (2) On one side of the blue PVC base film 3, a non-silicone release agent is coated using a textured coating machine, dried and rolled up. The drying temperature is 110℃ and the coating machine speed is 60m / min. (3) Prepare the raw materials for the preparation of the base layer 2 according to the proportion, stir for 30 min to mix evenly, and then coat the base layer for coating. Then coat it on the other side of the blue PVC base film 3, pre-dry it at 80°C until it is surface dry, coat the raw materials for the preparation of the pressure-sensitive adhesive layer on the base layer 2 that is not fully cured within 15 s, and dry it at 120°C with a gradient temperature increase to form an integrated coating. (4) Roll it up and wrap it with stretch film, then cure it at 40°C for 40 hours to finally obtain the desired PVC blue protective film. The curing process uses microencapsulated polyisocyanate curing agent.

[0050] In step (1), the melt co-extrusion temperature is 170-190℃: 170℃ in zone 1, 175℃ in zone 2, 180℃ in zone 3, 185℃ in zone 4, and 190℃ in the die head. The screw speed of the twin-screw extruder is 200 rpm and the traction rate is 25 m / min. In step (3), the coating speed is 70 m / min.

[0051] Example 2 like Figure 1 As shown, a PVC blue protective film includes a release layer 4, a blue PVC base film 3, a base coating layer 2, and a pressure-sensitive adhesive layer 1 arranged sequentially from top to bottom.

[0052] In some embodiments, the raw materials for preparing the base coating 2 include the following components in parts by weight: 100 parts of water-based hydroxyl polyacrylate emulsion 20 parts of waterborne polyurethane resin emulsion 5 parts water-based curing agent 0.5 parts of aziridine crosslinking agent (such as BASF XAMA-7) 8 portions of SiO2 nanosol 30 parts deionized water.

[0053] The raw materials for preparing pressure-sensitive adhesive layer 1 include the following components in parts by weight: 120 parts of butyl acrylate 80 parts of isooctyl acrylate 20 parts of methyl methacrylate 3 parts glycidyl methacrylate 12 parts of hydroxyethyl methacrylate 5 parts acrylic acid 10 parts of ethylene-vinyl acetate copolymer resin 5 parts of hydrogenated styrene-butadiene block copolymer 0.5 parts initiator 2 parts of curing agent 280 parts of solvent.

[0054] The raw materials for preparing blue PVC base film include the following components in parts by weight: 100 parts of PVC resin 30 parts plasticizer 2 parts of antistatic agent 3 parts of nano thermally conductive filler 3 parts calcium-zinc stabilizer.

[0055] The release layer 4 has a thickness of 2μm and a release force of 0.2N / 25mm. The blue PVC base film 3 has a thickness of 100μm. The base coating layer 2 has a thickness of 2μm. The pressure-sensitive adhesive layer 1 has a thickness of 30μm.

[0056] A method for preparing a blue PVC protective film includes the following steps: (1) Prepare the raw materials for the blue PVC base film 3 according to the proportion, and melt co-extrude to obtain the blue PVC base film 3; (2) On one side of the blue PVC base film 3, a non-silicone release agent is coated using a textured coating machine, dried and rolled up. The drying temperature is 110℃ and the coating machine speed is 60m / min. (3) Prepare the raw materials for the preparation of the base layer 2 according to the proportion, stir for 30 min to mix evenly, and then coat the base layer for coating. Then coat it on the other side of the blue PVC base film 3, pre-dry it at 95°C until it is surface dry, coat the raw materials for the preparation of the pressure-sensitive adhesive layer on the base layer 2 that is not fully cured within 10 s, and dry it at 120°C with a gradient temperature increase to form an integrated coating. (4) Roll it up and wrap it with stretch film, then cure it at 60°C for 40 hours to finally obtain the desired PVC blue protective film. The curing process uses microencapsulated polyisocyanate curing agent.

[0057] In step (1), the melt co-extrusion temperature is 170-190℃: 170℃ in zone 1, 175℃ in zone 2, 180℃ in zone 3, 185℃ in zone 4, and 190℃ in the die head. The screw speed of the twin-screw extruder is 300 rpm and the traction rate is 15 m / min. In step (3), the coating speed is 100 m / min.

[0058] The rest is the same as in Example 1.

[0059] Example 3 like Figure 1 As shown, a PVC blue protective film includes a release layer 4, a blue PVC base film 3, a base coating layer 2, and a pressure-sensitive adhesive layer 1 arranged sequentially from top to bottom.

[0060] In some embodiments, the raw materials for preparing the base coating 2 include the following components in parts by weight: 100 parts of water-based hydroxyl polyacrylate emulsion 15 parts of waterborne polyurethane resin emulsion 3 parts water-based curing agent 1 part of aziridine crosslinking agent (BASF XAMA-7) Six portions of SiO2 nanosol 24 portions of deionized water.

[0061] The raw materials for preparing pressure-sensitive adhesive layer 1 include the following components in parts by weight: 110 parts of butyl acrylate 90 parts of isooctyl acrylate 30 parts of methyl methacrylate 4 parts glycidyl methacrylate 15 parts of hydroxyethyl methacrylate 7 parts acrylic acid 20 parts of ethylene-vinyl acetate copolymer resin 10 parts of hydrogenated styrene-butadiene block copolymer 1 part initiator 16 parts of curing agent Solvent 400 parts.

[0062] The raw materials for preparing blue PVC base film include the following components in parts by weight: 100 parts of PVC resin 40 parts plasticizer 1 part antistatic agent 2 parts of nano thermally conductive filler 2.5 parts of calcium and zinc stabilizer.

[0063] The release layer 4 has a thickness of 1μm and a release force of 0.1N / 25mm. The blue PVC base film 3 has a thickness of 80μm. The base coating layer 2 has a thickness of 2μm. The pressure-sensitive adhesive layer 1 has a thickness of 20μm.

[0064] A method for preparing a blue PVC protective film includes the following steps: (1) Prepare the raw materials for the blue PVC base film 3 according to the proportion, and melt co-extrude to obtain the blue PVC base film 3; (2) On one side of the blue PVC base film 3, a non-silicone release agent is coated using a textured coating machine, dried and rolled up. The drying temperature is 100℃ and the coating machine speed is 70m / min. (3) Prepare the raw materials for the preparation of the base coating 2 according to the proportion, stir for 25 minutes to mix evenly, and then coat the base coating for coating. Then coat it on the other side of the blue PVC base film 3, pre-dry it at 90°C until it is surface dry, coat the raw materials for the preparation of the pressure-sensitive adhesive layer on the base coating 2 that is not fully cured within 15 seconds, and dry it at 115°C with a gradient temperature increase to form an integrated coating. (4) Roll it up and wrap it with stretch film, then cure it at 50°C for 48 hours to finally obtain the desired PVC blue protective film. The curing process uses microencapsulated polyisocyanate curing agent.

[0065] In step (1), the melt co-extrusion temperature is 170-190℃: 170℃ in zone 1, 175℃ in zone 2, 180℃ in zone 3, 185℃ in zone 4, and 190℃ in the die head. The screw speed of the twin-screw extruder is 250 rpm and the traction rate is 20 m / min. In step (3), the coating speed is 60 m / min.

[0066] The rest is the same as in Example 1.

[0067] Comparative Example 1 The standard blue PVC protective film (Nitto SPV-224SRB) was purchased from the market.

[0068] The performance of Examples 1-3 and Comparative Example 1 was tested, including the 180° peel force of the protective film adhesive layer, the initial adhesion of the ball, the holding time with a 1kg weight, and the unwinding force of the tape.

[0069] The results are shown in Table 1.

[0070] Table 1 As can be seen from Table 1, compared with Comparative Example 1, Examples 1-3 have a greater 180° peel force, stronger initial adhesion, and longer holding time, which is beneficial for the bonding and fixing of the PVC blue protective film to the wafer; the unwinding force of Examples 1-3 is moderate, neither too large nor too small, which is beneficial for automated film application by machines.

[0071] Any parts or structures not specifically described in this invention can be made using existing technologies or products, and will not be elaborated upon here.

[0072] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A PVC blue protective film, characterized in that, It includes, from top to bottom, a release layer, a blue PVC base film, a base coating layer, and a pressure-sensitive adhesive layer.

2. The PVC blue protective film according to claim 1, characterized in that, The raw materials for preparing the base coating include the following components in parts by weight: 100 parts of water-based hydroxyl polyacrylate emulsion 10-20 parts of waterborne polyurethane resin emulsion 2-5 parts of water-based curing agent Aziridine crosslinking agent 0.5–2 parts 3-8 parts of SiO2 nanosol 20-30 parts deionized water.

3. The PVC blue protective film according to claim 2, characterized in that, The water-based curing agent is a water-based isocyanate curing agent.

4. The PVC blue protective film according to claim 1, characterized in that, The raw materials for preparing the pressure-sensitive adhesive layer include the following components in parts by weight: 100-120 parts of butyl acrylate 80-100 parts of isooctyl acrylate 20-40 parts of methyl methacrylate 3-5 parts glycidyl methacrylate 12-16 parts of hydroxyethyl methacrylate 5-10 parts acrylic acid 10-30 parts of ethylene-vinyl acetate copolymer resin 5-15 parts of hydrogenated styrene-butadiene block copolymer Initiator 0.5–1.2 parts 2-20 parts of curing agent Solvent: 280-600 parts.

5. The PVC blue protective film according to claim 4, characterized in that, The solvent is a mixture of ethyl acetate, toluene, and isopropanol.

6. The PVC blue protective film according to claim 1, characterized in that, The raw materials for preparing the blue PVC base film include the following components in parts by weight: 100 parts of PVC resin 30-50 parts of plasticizer Antistatic agent 0.8-2 parts 1-3 parts of nano thermally conductive filler 2-3 parts calcium-zinc stabilizer.

7. The PVC blue protective film according to claim 1, characterized in that, The release layer is made by coating and drying a non-silicone release agent, which is a wax emulsion composed of PP wax, OP wax, and fluorocarbon surfactant.

8. The PVC blue protective film according to claim 1, characterized in that, The thickness of the release layer is 1-2 μm, the release force is 0.03-0.2 N / 25 mm, the thickness of the blue PVC base film is 50-100 μm, the thickness of the base coating layer is 1-2 μm, and the thickness of the pressure-sensitive adhesive layer is 10-30 μm.

9. A method for preparing a PVC blue protective film according to any one of claims 1-8, characterized in that, Includes the following steps: (1) Prepare the raw materials for the blue PVC base film according to the proportion, and melt co-extrude to obtain the blue PVC base film; (2) Coat one side of the blue PVC base film with a non-silicone release agent, dry and roll it up; (3) Prepare the raw materials for the preparation of the base layer according to the proportion, mix them evenly to obtain the base coating for coating, and then coat it on the other side of the blue PVC base film. Pre-dry it at 80-95℃ until it is surface dry. Coat the raw materials for the preparation of the pressure-sensitive adhesive layer on the base layer that is not fully cured within 15 seconds. Gradually increase the temperature at 95-120℃ to dry it and form an integrated coating. (4) Roll it up and wrap it with stretch film, then cure it at 40-60℃ for 40-55 hours to finally obtain the desired PVC blue protective film.

10. A method for preparing a PVC blue protective film according to claim 9, characterized in that, In step (1), the melt co-extrusion temperature is 170-190℃; in step (3), the coating speed is 40-100m / min.

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