A hot melt adhesive film prepared by coating and plating processes and a preparation method thereof

Abstract

The application discloses a method for preparing a hot melt adhesive film by adopting coating and plating processes, and comprises the following steps: adopting a water solution of a protective layer resin with hydrophobic and oleophobic properties to complete coating of a hydrophobic and oleophobic resin layer on the upper surface of a high-temperature-resistant base material; vacuum plating and plasma treatment are performed on the lower surface of the high-temperature-resistant base material to form a zinc sulfide reinforced plating layer; the coiled material after the vacuum plating of the zinc sulfide reinforced plating layer is placed on a feeding shaft of a coating machine, a glue tank is placed with a mixed hot melt adhesive resin solution, the mixed hot melt adhesive resin solution is coated on the zinc sulfide plating layer, and drying is performed to form a hot melt adhesive resin layer; the coiled material after the coating of the hot melt adhesive resin layer is placed on the feeding shaft of the coating machine, the glue tank is placed with a water-based polyurethane or polyethylene imine or ethylene-acrylic acid copolymer water solution, the water-based polyurethane or polyethylene imine or ethylene-acrylic acid copolymer water solution is coated to the surface of the coiled material, and drying is performed to form a tacky resin layer.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hot melt adhesive, in particular to a hot melt adhesive film prepared by coating and plating process and a preparation method thereof. BACKGROUND

[0002] The hot melt adhesive film is prepared by hot melt adhesive through calendering, casting, blowing film and other ways into a film product easy to industrial production. Generally, the hot melt adhesive film is prepared by high saturated polyolefin material as the base material, in order to increase the bonding performance of the hot melt adhesive film, usually adding adjuvant for bonding, and the PP material belongs to the difficult bonding material, and the existing adhesion for the PP material is mostly through physical change of the surface of the PP material or active of the surface of the PP material by other materials.

[0003] For example, the patent number 201120370413.0 discloses a gilding film structure, which comprises a plastic film, a UV reinforced coating layer, a plating layer and a hot melt adhesive layer, the plastic film is introduced with the UV reinforced coating layer on the top, the UV reinforced coating layer is introduced with the plating layer on the top, and the plating layer is introduced with the hot melt adhesive layer on the top.

[0004] The above patent scheme coats the UV reinforced coating layer on the plastic film, and then plates the plating layer, and transfers the plastic film, the UV reinforced coating layer and the plating layer to the gilding object by the adhesion of the hot melt adhesive layer, which shortens the process, reduces the cost, has high hardness and wear resistance, does not need to coat the protective film again, and does not need to set the release layer on one side of the plastic film, and the UV reinforced coating layer and the plastic film are in direct contact, which increases the surface brightness of the gilding object.

[0005] However, the hot melt adhesive film product of the above patent scheme still has the following problems:

[0006] 1. The base material is plastic film, and the stability of high temperature resistance performance cannot be guaranteed.

[0007] 2. The surface of the ideal hot melt adhesive film product should have good hydrophobic and oleophobic functions, and the surface should have low moisture absorption function.

[0008] 3. In order to improve the peeling force between the hot melt adhesive layer and the base material, the consistency of the surface performance of the base material is needed, and a starting hot melt adhesive performance connecting interface is added to ensure that the combination of the hot melt adhesive film and the base material has high uniformity, and long-term high temperature resistance (≥128℃) is guaranteed.

[0009] Therefore, it is necessary to improve the prior art to overcome the above defects. SUMMARY

[0010] The application aims to provide a hot melt adhesive film prepared by coating and plating process and a preparation method thereof.

[0011] The above technical purpose of the application is achieved by the following technical scheme:

[0012] A method for preparing a hot melt adhesive film by coating and plating process, comprising the following steps:

[0013] Step 1) coating a hydrophobic and oleophobic resin layer

[0014] The temperature-resistant substrate is placed on the coating machine feed shaft, and the glue tank is filled with a water solution of a hydrophobic and oleophobic protective layer resin. The upper surface of the temperature-resistant substrate is coated with a hydrophobic and oleophobic resin layer.

[0015] Step 2) vacuum plating zinc sulfide to enhance the plating layer:

[0016] The lower surface of the temperature-resistant substrate coated with the hydrophobic and oleophobic resin layer in step 1) is subjected to vacuum plating and plasma treatment, and a zinc sulfide enhanced plating layer is formed on the lower surface of the temperature-resistant substrate. The zinc sulfide enhanced plating layer is used to enhance the connecting layer and increase the bonding force between the temperature-resistant substrate and the subsequently coated hot melt adhesive.

[0017] Step 3) coating a hot melt adhesive resin layer:

[0018] The roll material after vacuum plating of the zinc sulfide enhanced plating layer is placed on the coating machine feed shaft, and the glue tank is filled with a mixed hot melt adhesive resin solution. The mixed hot melt adhesive resin solution is coated on the zinc sulfide plating layer and dried to form a hot melt adhesive resin layer.

[0019] Step 4) coating a tackifier resin layer:

[0020] The roll material after coating of the hot melt adhesive resin layer is placed on the coating machine feed shaft, and the glue tank is filled with a water solution of water-based polyurethane or polyethylene imine or ethylene-acrylic acid copolymer. The water-based polyurethane or polyethylene imine or ethylene-acrylic acid copolymer water solution is coated on the surface of the roll material and dried to form a tackifier resin layer.

[0021] Further, the hydrophobic and oleophobic resin layer uses water-based acrylic resin or polyurethane resin, which has a protective and hydrophobic and oleophobic effect on the temperature-resistant substrate. After coating and drying, the resin thickness is 1-5 μm.

[0022] Further, the zinc sulfide reinforced plating layer is used to enhance the connection strength of the high-temperature-resistant substrate and the hot melt adhesive resin layer, and the thickness of the zinc sulfide reinforced plating layer after plasma treatment ranges from 80 nm to 200 nm.

[0023] Further, the hot melt adhesive resin layer adopts water-based or solvent-based acrylic or polyurethane resin, which includes polyurethane, flame retardant, resin additive, curing agent and filler.

[0024] Further, the hot melt adhesive resin layer and the high-temperature-resistant substrate are coated by a resin coating method, and the thickness of the hot melt adhesive resin layer used in the coating process ranges from 5 μm to 100 μm.

[0025] or the high-temperature-resistant substrate layer and the hot melt adhesive resin layer are compounded by a solvent-free compounding and dry compounding process, and the thickness of the hot melt adhesive resin layer used in the solvent-free compounding and dry compounding process ranges from 15 μm to 150 μm.

[0026] or the hot melt adhesive resin layer and the high-temperature-resistant substrate are prepared by an extrusion compounding process, and the thickness of the hot melt adhesive resin layer extruded by the extrusion compounding process ranges from 15 μm to 150 μm.

[0027] Further, the initial adhesion resin layer is made of polyethylene imine or ethylene-acrylic acid copolymer or high-molecular polyurethane water solution, and the coating dry weight ranges from 0.03 g / m 2 2 to 0.09 g / m 2, the solid content ranges from 0.8% to 5.4%, and the thickness ranges from 0.02 μm to 0.05 μm.

[0028] Further, the prepared hot melt adhesive film sequentially includes the hydrophobic and oleophobic resin layer, the high-temperature-resistant substrate, the zinc sulfide reinforced plating layer, the hot melt adhesive resin layer and the initial adhesion resin layer from top to bottom.

[0029] In summary, the present application has the following beneficial effects:

[0030] The present application uses the combination of the initial adhesion layer coating process and the evaporation zinc sulfide plating film process, and the produced effect is that the hot melt adhesive product is resistant to high temperature and high humidity, has multiple hot melt adhesive bonding, is firm, has no air bubbles and pores, and can maintain stability and insulation at 125°C. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of embodiment 1 according to the present application. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with the drawings and specific embodiments.

[0033] As Figure 1As shown, the present application proposes a new hot melt adhesive film preparation method, comprising the following steps:

[0034] Step 1, coating hydrophobic and oleophobic resin:

[0035] PPS (or one of PET, PC) as a high-temperature-resistant substrate is placed on the coating machine feed shaft, and the glue tank is placed with a water solution of a protective layer resin with hydrophobic and oleophobic properties. This resin is an acrylic or polyurethane series. The coating thickness of the hydrophobic and oleophobic coating of ordinary hot melt adhesive products is 0.8-7μm, the coating liquid working concentration is 25-40%, the screen roller is 80-100 mesh, and after the upper surface of the substrate is coated with a hydrophobic and oleophobic coating, it is dried with the coating facing outward and then wound up.

[0036] Step 2, vacuum plating of zinc sulfide film:

[0037] The lower surface of the substrate with the surface coating prepared in step 1 is subjected to vacuum plating and plasma treatment, so that the thickness of the plated zinc sulfide (ZnS) layer is uniform, 90-2000nm, and the wetting tension is ≥38 dynes / cm. The plated layer enhances the connection layer and increases the bonding force of the substrate and the hot melt adhesive coated in the subsequent process.

[0038] Step 3, coating hot melt adhesive:

[0039] The PPS (or one of PET, PC) coiled material after vacuum plating is placed on the coating machine feed shaft, and the glue tank is placed with a mixed type hot melt adhesive resin solution with polyurethane as the main component, and flame retardant, resin additive (defoaming additive), curing agent, and filler (antistatic) as auxiliary main components. After the coating and drying process, the resin is uniformly coated on the plated layer. The coating liquid working concentration is 25-40%. The screen roller is 80-100 mesh, and after the coating is completed, it is wound up with the coating facing outward.

[0040] Step 4, coating the initial adhesion layer resin:

[0041] The PPS (or one of PET, PC) coiled material after hot melt adhesive coating is placed on the coating machine feed shaft, and the glue tank is placed with a water-based polyurethane or polyethylene imine or ethylene-acrylic acid copolymer water solution. The general coating dry weight is 0.03-0.09g / m 2 , the solid content is 0.8%-5.4%, and the thickness is 0.02-0.05μm. The coating liquid working concentration is 25-40%. The screen roller is 100-110 mesh, and after the coating is completed, it is dried with the coating facing outward and then wound up.

[0042] The hot melt adhesive layer can also be made of a composite hot melt adhesive film:

[0043] 1) Extrusion composite machine hot melt adhesive resin method for making hot melt adhesive film:

[0044] The PE hot melt adhesive pellets with melt index MI = 6 g / 10 min (190℃, 2.16 kg) and melting point 120℃ are put into the extruder after drying treatment, and extruded on the primer layer at a melting temperature of 225-260℃, with a thickness of 10-50μm, and then combined with the CPP film by the action of cooling roller and extrusion roller to form the adhesive layer.

[0045] 2) PPS dr. / MPE or PPS sf.. / MPE method to make hot melt adhesive film:

[0046] The lower surface of the PPS film (or BOPET, PCMPE) is coated with adhesive, and then combined with the upper surface of the low-hygroscopic material MPE film, and the lower surface of the MPE has a heat-sealable primary adhesive layer; or a solvent-free compounding method is used.

[0047] Example 1

[0048] The following is an explanation of the hot melt adhesive film embodiment of the coating + plating + coating process:

[0049] 1. Simplified structure of the product designed in this embodiment

[0050] Hydrophobic and oleophobic acrylic water-based coating + PPS substrate + enhanced function ZnS plating layer + polyurethane solvent-based hot melt adhesive layer + water-based polyurethane primary adhesive layer.

[0051] 2. Process

[0052] Select a transparent PPS film with a thickness of 38μm → coat the upper surface with a hydrophobic and oleophobic acrylic water-based resin layer → vacuum evaporate ZnS transparent plating layer on a vacuum aluminum plating machine → coat mixed hot melt adhesive solvent-based coating liquid → coat primary adhesive layer water-based coating liquid.

[0053] 3. Specific manufacturing steps

[0054] Step 1, coat the hydrophobic and oleophobic resin:

[0055] This embodiment uses a double-sided chemical coating treated PET substrate as a high-temperature resistant substrate, which is placed on the coating machine feed shaft and the inner layer is used as the coating surface; the glue tank is placed with a water solution of a hydrophobic and oleophobic protective layer resin, which is one of the acrylic hydrophobic and oleophobic resins. The hydrophobic and oleophobic coating thickness of the hot melt adhesive film product in this embodiment is in the range of 1-7μm, and the coating liquid working concentration is 28%. The mesh roller is 100 mesh. After completing the hydrophobic and oleophobic coating on the upper surface of the PET substrate, the coated layer is dried with the coated layer facing outward and then wound up.

[0056] Step 2, functional plating:

[0057] The lower surface of the PET substrate prepared in step 1 is vacuum plated to enhance the connection layer and increase the bonding force between the substrate and the hot melt adhesive coated in the subsequent process; after plating, the plated surface is synchronously treated by plasma to achieve a ZnS plating layer with a thickness of 180 nm and a wetting tension of ≥38 dynes / cm.

[0058] Step 3, coating hot melt adhesive:

[0059] The PET web after vacuum plating is placed on the feed shaft of the coating machine, and the glue tank is placed to prepare a coating solution of hot melt adhesive with polyurethane as the main component (main agent), additives (defoamer, flame retardant, antistatic agent, filler), and curing agent as auxiliary components.

[0060] The coating liquid ratio is: main agent: additive: curing agent = 10:1:0.5);

[0061] Among them, defoamer: flame retardant: antistatic agent = 1:2:0.5;

[0062] The filler is an inorganic substance, nano titanium dioxide.

[0063] After the coating and drying process, the resin is uniformly coated on the plating layer. The working concentration of the coating solution is 25%, the upper glue roller is 80 mesh, the coating thickness is 38 μm, and after the coating is completed, the coating is rolled inward.

[0064] Step 4, coating the primary adhesion layer: The PET web after hot melt adhesive coating is placed on the feed shaft of the coating machine, and the primary adhesion layer is planned to be coated on the hot melt adhesive surface. The glue tank is placed with polyethylene imine aqueous solution, the dry coating weight is 0.08 g / m2, the solid content is 0.8%, and the thickness is ≥0.05 μm. The working concentration of the coating solution is 28%, the mesh roller is 100-110 mesh, and after the coating is completed, the coating is dried and rolled inward.

[0065] 4. Explanation of reinforcing the aluminum plated resin layer and the aluminum plated layer

[0066] This embodiment uses double-sided chemical treatment of PET, so there is no need to coat acrylic and other reinforcing plating resins again; the vacuum aluminum plating machine used is a Leybold vacuum plating machine.

[0067] Example 2

[0068] The following is an explanation of the hot melt adhesive film embodiment of the coating + plating + extrusion composite process:

[0069] 1. Simplified structure of the product designed in this embodiment

[0070] Hydrophobic and oleophobic acrylic water-based coating + PPS substrate + reinforcing function ZnS plating layer + PE resin layer + water-based polyurethane primary adhesion layer. This embodiment uses PE as the hot melt adhesive layer.

[0071] 2. Process

[0072] Selecting a transparent PPS film with a thickness of 40 μm → coating the upper surface with a hydrophobic and oleophobic oleic acid aqueous resin layer → vacuum evaporating a ZnS transparent plating layer on a vacuum aluminum plating machine → extruding a PE hot melt adhesive resin → coating a primary adhesive layer with an aqueous coating solution.

[0073] 3. Specific manufacturing steps

[0074] Step 1. Coating a hydrophobic and oleophobic resin:

[0075] The PPS, which is a high-temperature resistant base material, is placed on a coating machine feed shaft, and a glue tank is placed with a hydrophobic and oleophobic polyurethane resin aqueous solution. In this embodiment, the hydrophobic and oleophobic coating layer has a thickness of 4 μm, and a screen roll has 100 meshes. After the hydrophobic and oleophobic coating layer is completed, the coating layer is dried from the inside and then wound.

[0076] Step 2. Vacuum plating a zinc sulfide film:

[0077] The lower surface of the PPS base material with the surface coating layer prepared in Step 1 is subjected to vacuum plating and plasma treatment, so that the thickness of the ZnS plating layer of the plated surface is uniform at 90-2000 nm, and the wetting tension is ≥ 38 dynes / cm.

[0078] Step 3. Extrusion of a PE (hot melt adhesive):

[0079] The extrusion of a PE (hot melt adhesive) process is completed on the vacuum plated layer using an extrusion compounding machine to form a pre-coated film. The PE resin has a thickness of 15 μm and is extruded and cast on the ZnS surface at a melt temperature of 235-260°C after the PE hot melt adhesive pellets with a melt index MI = 8 g / 10 min (190°C, 2.16 kg) and a melting point of 120°C are dried and fed into the extruder. The hot melt adhesive layer is formed by the action of a cooling roll and a pressing roll, and has a peel strength value of greater than 0.7 N / 15 mm. After being cut and trimmed, the pre-coated hot melt adhesive film is wound with the PE inside.

[0080] Step 4. Coating a primary adhesive layer resin:

[0081] The PPS roll material after the extrusion of the PE hot melt adhesive is placed on a coating machine feed shaft, and a glue tank is placed with an aqueous polyurethane solution. The coating dry weight is 0.09 g / m, the solid content is 0.9%, and the thickness is 0.08 μm. The coating liquid working concentration is 28%, and the coating is completed with a screen roll of 110 meshes. The coating layer is dried from the inside and then wound. 2

[0082] Example 3

[0083] The following is a description of a hot melt adhesive film embodiment of the coating + plating + dry compounding process.

[0084] ​1. The product of the present embodiment is designed to have a simplified structure

[0085] Hydrophobic and oleophobic acrylic water-based coating + PC substrate + enhanced function ZnS plating + MPE film + water-based polyurethane type primary adhesive layer.

[0086] 2. Process

[0087] Transparent PC film with a selected thickness of 28 μm → upper surface coated with a hydrophobic and oleophobic acrylic water-based resin layer → vacuum evaporation of ZnS transparent plating layer on a vacuum aluminum plating machine → dry lamination of MPE hot melt adhesive film → coating of a primary adhesive coating solution.

[0088] 3. Specific manufacturing steps

[0089] Step 1: Coating of a hydrophobic and oleophobic resin:

[0090] PC with a thickness of 28 μm is placed on the feed shaft of the coating machine as a high-temperature-resistant substrate, and a water solution of a hydrophobic and oleophobic protective layer resin is placed in the glue tank. This resin is an acrylic series. The hydrophobic and oleophobic coating of the ordinary hot melt adhesive product has a thickness of 7 μm, the working concentration of the coating solution is 28%, and the screen roller is 100 mesh. After completing the coating of the hydrophobic and oleophobic coating on the upper surface of the substrate, it is dried with the coating facing inward and then wound up.

[0091] Step 2: Vacuum plating of zinc sulfide film:

[0092] The lower surface of the substrate with the surface coating prepared in Step 1 is subjected to vacuum plating and plasma treatment, so that the thickness of the ZnS plating layer on the plating surface is uniform at 1600 nm, and the wetting tension is ≥ 38 dynes / cm.

[0093] Step 3: Lamination of MPE film:

[0094] The PC web after vacuum plating is placed on the compound machine as the adhesive-coated substrate on the one feed shaft, and a two-component polyurethane compound adhesive solution is placed in the glue tank with ethyl acetate as the diluent. After coating and drying through the drying tunnel, it is compounded with the upper surface of the MPE substrate with a thickness of 30 μm on the two feed shafts, and then placed in the curing chamber for curing at 50 ± 5°C. The working concentration of the compound solution is 3# Zahn cup ≤ 25 s, and the screen roller is 100 mesh. After completion of the compounding, it is wound up with the MPE facing inward. The dry coating amount is 2.5-2.8 g / m 2 .

[0095] Step 4: Coating of a primary adhesive layer resin:

[0096] The PPS (or PET, PC) web after completion of hot melt adhesive coating is placed on the feed shaft of the coating machine, and a water-based polyurethane or polyethylene imine solution is placed in the glue tank. The general dry coating weight is 0.03-0.09 g / m 2, solid content 1.1%, thickness 0.05 μm. Coating liquid working concentration 30%, screen roll 110 mesh, after coating, drying with coating layer inside, and winding.

[0097] Comparative Example 1

[0098] The following is a comparative explanation of the plating enhanced coating layer of the present application and the conventional coating enhanced coating process of the hot melt adhesive film.

[0099] 1. Product structure: hydrophobic and oleophobic acrylic water-based coating layer + PPS substrate + polyurethane enhanced coating layer + polyurethane solvent type hot melt adhesive layer + water-based polyurethane priming layer.

[0100] 2. Process

[0101] The process is similar to Example 1 except that the priming process is replaced by coating. Select a transparent PPS film with a thickness of 38 μm → coat a hydrophobic and oleophobic acrylic water-based resin layer on the upper surface → coat a polyurethane resin layer → coat a mixed type hot melt adhesive solvent-based coating liquid → coat a priming layer water-based coating liquid.

[0102] 3. Comparative explanation:

[0103] The pinhole points and bubble points of the coated tackifying coating layer are more than those of the plating zinc sulfide layer. Therefore, the high temperature resistance and moisture resistance and barrier properties of the present hot melt adhesive film product are not as good as the plating effect.

[0104] Comparative Example

[0105] The following is a comparative explanation of the priming coating layer of the present application and the conventional hot melt adhesive film without tackifying coating layer.

[0106] 1. Product structure: hydrophobic and oleophobic acrylic water-based coating layer + PPS substrate + enhanced function ZnS plating layer + polyurethane solvent type hot melt adhesive layer.

[0107] 2. Process

[0108] The process is similar to Example 1 except that the priming process is replaced by coating. Select a transparent PPS film with a thickness of 38 μm → coat a hydrophobic and oleophobic acrylic water-based resin layer on the upper surface → enhanced function ZnS plating layer → coat a mixed type hot melt adhesive solvent-based coating liquid.

[0109] 4. Comparative explanation:

[0110] The pinhole points and bubble points of the coated tackifying coating layer are more than those of the plating zinc sulfide layer. Therefore, the high temperature resistance and moisture resistance and barrier properties of the present hot melt adhesive film product are not as good as the plating effect. In particular, the peel strength of the hot melt adhesive film product without priming coating layer is poor.

[0111] In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like, are used as terms of convenience to describe orientations or positional relationships based on the orientations or positional relationships shown in the figures, and are not to be construed as limiting the present application.

[0112] In this document, the terms "comprise", "comprising", or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0113] The foregoing is considered as illustrative only of the principles of the application. Those skilled in the art will readily devise their own approaches to implementing the principles disclosed herein without departing from the essential characteristics of the application and, therefore, the present application should not be limited to any single embodiment discussed herein, but rather fully encompass all such embodiments that are within its scope. It is therefore desired that what is, within the scope of the appended claims and their equivalents, be deemed the application.

Claims

1. A method for preparing a hot melt adhesive film using coating and deposition processes, characterized in that, Includes the following steps: Step 1) Apply a hydrophobic and oleophobic resin layer The high-temperature resistant substrate (2) is placed on the feeding shaft of the coating machine, and an aqueous solution of a protective layer resin with hydrophobic and oleophobic properties is placed in the glue tank to coat the upper surface of the high-temperature resistant substrate (2) with a hydrophobic and oleophobic resin layer (1). Step 2) Vacuum plating of zinc sulfide reinforced coating: In step 1), the lower surface of the high-temperature resistant substrate (2) after the hydrophobic and oleophobic resin layer (1) has been coated is subjected to vacuum coating and plasma treatment, and a zinc sulfide reinforced coating (3) is formed on the lower surface of the high-temperature resistant substrate (2). The zinc sulfide reinforced coating (3) is used to reinforce the bonding layer and increase the bonding force between the high-temperature resistant substrate (2) and the hot melt adhesive applied subsequently. Step 3) Apply hot melt adhesive resin layer: After the vacuum zinc sulfide reinforced coating (3) is completed, the roll is placed on the feeding shaft of the coating machine, the mixed hot melt adhesive resin solution is placed in the glue tank, the mixed hot melt adhesive resin solution is coated on the zinc sulfide coating, and dried to form a hot melt adhesive resin layer (4). Step 4) Apply the initial tack resin layer: After the hot melt adhesive resin layer (4) is coated, the roll material is placed on the feeding shaft of the coating machine. The adhesive tank is filled with an aqueous solution of water-based polyurethane, polyethyleneimine, or ethylene-acrylic acid copolymer. The aqueous solution of water-based polyurethane, polyethyleneimine, or ethylene-acrylic acid copolymer is coated onto the surface of the roll material and dried to form a preliminary tack resin layer (5). The dry weight of the preliminary tack resin layer (5) is 0.03-0.09 g / m³. 2 The solid content is 0.8%-5.4%, and the thickness is 0.02-0.05μm.

2. The method for preparing hot melt adhesive film using coating and deposition processes according to claim 1, characterized in that, The hydrophobic and oleophobic resin layer (1) is made of water-based acrylic resin or polyurethane resin, which has a protective and hydrophobic / oleophobic effect on the high-temperature resistant substrate (2). The resin thickness is 1-5 μm after coating and drying.

3. The method for preparing hot melt adhesive film using coating and deposition processes according to claim 1, characterized in that, The zinc sulfide reinforced coating (3) is used to enhance the connection strength between the high-temperature resistant substrate (2) and the hot melt adhesive resin layer (4). The zinc sulfide reinforced coating (3) after plasma treatment has a thickness range of 80-200 nm.

4. The method for preparing hot melt adhesive film using coating and deposition processes according to claim 1, characterized in that, The hot melt adhesive resin layer (4) is made of solvent-based polyurethane resin, which includes polyurethane, flame retardant, resin additive, curing agent and filler.

5. The method for preparing hot melt adhesive film using coating and deposition processes according to claim 1, characterized in that, The hot melt adhesive resin layer (4) and the high-temperature resistant substrate (2) are coated at high temperature by coating resin. The thickness of the hot melt adhesive resin layer (4) used in the coating process is 5-100μm. Alternatively, the high-temperature resistant substrate (2) layer is combined with the hot melt adhesive resin layer (4) through solvent-free composite and dry composite processes, and the thickness of the hot melt adhesive resin layer (4) used in the solvent-free composite and dry composite processes is 15-150μm. Alternatively, the hot melt adhesive resin layer (4) and the high-temperature resistant substrate (2) may be prepared by an extrusion composite process, wherein the thickness of the hot melt adhesive resin layer (4) extruded by the extrusion composite process is 15-150 μm.

6. The method for preparing a hot melt adhesive film using coating and deposition processes according to claim 1, characterized in that, The prepared hot melt adhesive film comprises, from top to bottom, a hydrophobic and oleophobic resin layer (1), a high-temperature resistant substrate (2), a zinc sulfide reinforced coating (3), a hot melt adhesive resin layer (4), and an initial tack resin layer (5).

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