WO2014000631A1 - Precoating film and preparation method thereof - Google Patents

Precoating film and preparation method thereof Download PDF

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Publication number
WO2014000631A1
WO2014000631A1 PCT/CN2013/077905 CN2013077905W WO2014000631A1 WO 2014000631 A1 WO2014000631 A1 WO 2014000631A1 CN 2013077905 W CN2013077905 W CN 2013077905W WO 2014000631 A1 WO2014000631 A1 WO 2014000631A1
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WO
WIPO (PCT)
Prior art keywords
layer
melt adhesive
hot melt
agent
substrate layer
Prior art date
Application number
PCT/CN2013/077905
Other languages
French (fr)
Chinese (zh)
Inventor
钟玉
Original Assignee
北京康得新复合材料股份有限公司
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Publication of WO2014000631A1 publication Critical patent/WO2014000631A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
    • C09J2301/162—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer the carrier being a laminate constituted by plastic layers only
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/208—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/414—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of a copolymer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/10—Presence of homo or copolymers of propene
    • C09J2423/106—Presence of homo or copolymers of propene in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2431/00—Presence of polyvinyl acetate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2477/00—Presence of polyamide
    • C09J2477/006—Presence of polyamide in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2479/00—Presence of polyamine or polyimide
    • C09J2479/02—Presence of polyamine or polyimide polyamine
    • C09J2479/026—Presence of polyamine or polyimide polyamine in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2493/00—Presence of natural resin

Definitions

  • the present invention relates to the field of printing film technology, and in particular to a precoat film and a method for preparing the precoat film.
  • Print film is an important means of post-press processing, which determines the final value of the printed product.
  • the film coating process of the printed matter refers to covering the paper printed matter with a plastic film, and using an adhesive in the middle, after heat and pressure treatment, the two different properties of the plastic film and the paper are bonded together to form a paper/plastic combination.
  • a surface decoration processing technology It protects and decorates printed products and is widely used in the field of packaging and printing, such as book covers, brochures, maps, advertising gift bags, and advanced packaging boxes.
  • Pre-coated film can be called environmentally friendly or clean laminating technology, which can protect the environment, protect health and produce safely, so it is more and more popular in the market.
  • the current domestic pre-coated film products are ordinary EVA pre-coated films.
  • ordinary pre-coated films can meet the requirements.
  • ordinary pre-coated films will exhibit quality problems such as blistering and delamination, which will seriously affect the yield and work of the film. effectiveness.
  • the present invention is directed to solving at least some of the above technical problems or at least providing a useful commercial choice. To this end, it is an object of the present invention to provide a precoated film which has a soft touch and which has good adhesion to a print.
  • Another object of the present invention is to provide a process for preparing the above precoated film.
  • a precoat film comprising: a substrate layer, the substrate layer comprising: a substrate layer, the substrate layer being a biaxially stretched polyester layer, a biaxially stretched nylon a layer or biaxially oriented polypropylene layer; and a flexible coating disposed on the first side of the substrate layer and formed of a mixture of a polyurethane dispersion and a curing agent, polyurethane in the mixture a weight percentage of 15% to 30% and a weight percentage of the curing agent of 50% or less, an intermediate layer, the intermediate layer being disposed on the second surface of the substrate layer and formed of an aqueous solution of polyethyleneimine, Polyethylene The solid content of the imine is 0.4%-2.
  • the dry weight of the coating is 0. 007_0. 03 ⁇ 1 112 ; a hot melt adhesive layer, the hot melt adhesive layer is disposed on the intermediate layer and Forming EVA, EEA, EAA or EMA; and an adhesion-promoting layer disposed on the molten rubber layer and formed of a modified acrylic emulsion or a mixture of a modified polyurethane acid emulsion and an auxiliary agent, wherein the modification 1%_10% ⁇
  • the weight of the adhesion promoter is 0.1% _10%.
  • the weight percentage of the adhesion promoter is 0.1% _10%.
  • the surface of the precoat film according to the embodiment of the present invention has a soft touch and the surface scratches can be gradually self-healing, and can resist slight abrasion or scratching.
  • the adhesion-promoting layer as a surface of the pre-coating film and the printed matter of the embodiment of the present invention can not only enhance the adhesion between the pre-coating film and the printed matter, but also meet the requirements of the subsequent processing steps, and expand the pre-coating film. The scope of use.
  • precoat film according to the above embodiment of the present invention may further have the following additional technical features:
  • the hot melt adhesive layer is formed of EVA
  • the VA weight percentage in the hot melt adhesive layer is 10% to 30% and the melt index is 10 to 25 g/10 min.
  • the adhesion promoter is a terpene phenol resin, a silane coupling agent or an ethylene-acrylic acid emulsion.
  • the first leveling agent is 0. 01% by weight of the first leveling agent.
  • the first leveling agent is 0. 01. %-1%.
  • the adjuvant further comprises an antifoaming agent.
  • the thickness of the substrate layer is 8-50 ⁇
  • the thickness of the flexible coating layer is 2-10 ⁇
  • the thickness of the hot melt adhesive layer is 8-30 ⁇ . 5 ⁇
  • the thickness of the adhesive layer is 0. 1-0. 5 ⁇ m.
  • the polyurethane dispersion contains a second leveling agent, a film former, a thickener and a diluent.
  • the second leveling agent is a silicone leveling agent
  • the film forming agent is a glycol ether, a glycol ether ester or an ester alcohol film forming agent.
  • Thickeners include acrylate and/or methacrylate copolymers, including deionized water.
  • the polyethyleneimine has the formula (CH2CH2NH) n, wherein n is in a range such that the average molecular weight is between 1000 and 10,000.
  • the curing agent is an aziridine or isocyanate curing agent.
  • a substrate layer which is a biaxially stretched polyester layer, a biaxially stretched nylon layer or a biaxially oriented polypropylene layer; 2) a flexible coating comprising a mixture of a polyurethane dispersion and a curing agent Laying on the first side of the substrate layer to form a flexible layer, the substrate layer and the flexible layer forming a substrate layer;
  • the precoat film preparation method according to the embodiment of the present invention is not only simple in operation, but also effectively reduces the cost of precoat film preparation because the existing precoat film production line is fully utilized.
  • the precoat film prepared by the precoat film preparation method according to the embodiment of the present invention not only has a soft touch, but also can enhance the adhesion between the precoat film and the printed matter, and satisfies the requirements of the subsequent processing steps.
  • the method for preparing a precoat film according to the above embodiment of the present invention may further have the following additional technical features:
  • the theme layer is a biaxially oriented polypropylene layer, and the step 3) The method includes: 3-1) performing corona treatment on the second surface of the substrate layer, so that the surface value of the second surface of the substrate layer reaches 36 or more;
  • a polyethyleneimine aqueous solution is coated on the second side of the corona-treated substrate layer and dried, and the drying temperature is 85-95 °C.
  • the step 5) comprises:
  • a mixture of a modified acrylic emulsion or a modified urethane emulsion and an auxiliary agent is coated on the surface of the corona-treated hot-melt adhesive layer and dried, and the drying temperature is 70-95 °C.
  • the modified acrylic emulsion or the mixture of the modified urethane emulsion and the auxiliary agent is subjected to a high-speed dispersion treatment before coating.
  • the time of the high speed dispersion treatment is 10-20 minutes.
  • FIG. 1 is a schematic structural view of a precoat film according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a substrate layer of a precoat film according to an embodiment of the present invention
  • FIG. 3 is a flow chart of a method of preparing a precoat film according to an embodiment of the present invention.
  • FIG. 4 is a flow chart showing the fifth step in the method of preparing a precoat film according to an embodiment of the present invention.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Or implicitly indicate the number of technical features indicated. Thus, features defining “first” and “second” may include one or more of the features, either explicitly or implicitly. In the description of the present invention, the meaning of “plurality” is two or more, unless specifically defined otherwise.
  • the first feature "on” or “under” the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise explicitly defined and defined. It is not in direct contact but through additional features between them.
  • the first feature “aboves”, “above” and “above” the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is less than the second feature.
  • a precoat film according to an embodiment of the present invention will be described below with reference to Figs. 1-2.
  • a precoat film according to an embodiment of the present invention comprises a substrate layer 1, an intermediate layer 2, a hot melt adhesive layer 3, and an adhesion promoting layer 4.
  • the substrate layer 1 includes a substrate layer 11 and a flexible coating 12.
  • the substrate layer 11 may be a biaxially stretched polyester (B0PET) layer, a biaxially stretched nylon (B0PA) layer or a biaxially stretched polypropylene (BOPP) layer.
  • the thickness of the substrate layer 11 can be 8_50 ⁇ ⁇ . Wherein, when the substrate layer 11 is B0PET, the thickness of the B0PET is preferably 9-12 ⁇ ; when the substrate layer 11 is B0PA, the thickness of the B0PA is preferably 12-20 ⁇ m; when the substrate layer 11 is B0PP The thickness of B0PP is preferably 12-15 ⁇ m.
  • a flexible coating 12 is disposed on the first side 111 of the substrate layer 11 and is formed from a mixture of a polyurethane dispersion and a curing agent.
  • the weight percentage of the polyurethane in the mixture is 15% to 30% and the weight percentage of the curing agent is 50% or less.
  • the curing agent may be an aziridine or an isocyanate curing agent.
  • the flexible coating 12 has a thickness of 2 to 10 ⁇ m, preferably 2. 5 to 4 ⁇ .
  • the intermediate layer 2 is disposed on the second side 112 of the substrate layer 11 and is formed of an aqueous solution of polyethyleneimine. 009-0. 01 lg/ m 2 . The 00-0. 01 lg / m 2 .
  • the molecular formula of polyethyleneimine is (CH2CH2NH) n, wherein n is in the range of 1000-10000.
  • the hot melt adhesive layer 3 is disposed on the intermediate layer 2 and is composed of ethylene-vinyl acetate copolymer (EVA), ethylene-propylene acetate copolymer (EEA), ethylene-acrylic acid copolymer (EAA) or ethylene-methacrylic acid (EMA). form.
  • EVA ethylene-vinyl acetate copolymer
  • EAA ethylene-propylene acetate copolymer
  • EAA ethylene-acrylic acid copolymer
  • EMA ethylene-methacrylic acid
  • the thickness of the hot melt adhesive layer 3 is 8-30 ⁇ ⁇ , preferably 12-19 ⁇ ⁇ .
  • the adhesion-promoting layer 4 is disposed on the molten rubber layer 3 and is in direct contact with the surface of the printed matter to be coated.
  • the adhesion-promoting layer 4 is formed of a modified acrylic emulsion or a mixture of a modified polyurethane acid emulsion and an auxiliary.
  • the modified acrylic emulsion or the modified polyurethane acid emulsion has a solid content of 50% or less.
  • the 5% by weight of the mixture is preferably 0.1% _10%, preferably 0.5% 5% by weight.
  • the thickness of the adhesion-promoting layer is 0. 1-0. 5 ⁇ ⁇ (coating dry weight is 0. 05-0. 5g / m 2 ), preferably 0. 2_0. 4 ⁇ m (coating dry weight is 0 1-0. 4g/m).
  • the adhesion-promoting layer 4 allows the pre-coated film of the embodiment of the present invention to have better adhesion and can be laminated on the surface of a plurality of textures to be coated, thereby expanding the range of use.
  • the adhesion-promoting layer 4 also has a low surface wetting tension of the pre-coated film of the embodiment of the invention, and is suitable for subsequent processing such as rolling line, unevenness, and automatic high-speed film coating process, and does not cause problems such as bubbles or delamination. .
  • the surface of the precoated film according to the embodiment of the present invention has a soft touch and the slight scratches of the surface can be gradually self-healing, and can resist slight abrasion or scratching.
  • the adhesion-promoting layer 4 as a surface of the pre-coated film and the printed article of the embodiment of the present invention can not only enhance the adhesion between the pre-coated film and the printed matter, but also meet the requirements of the subsequent processing steps, and expand the pre-coating. The range of use of the film.
  • the adhesion promoter is a terpene phenolic resin, a silane coupling agent or an ethylene-acrylic emulsion, preferably an ethylene-acrylic emulsion, wherein the ethylene-acrylic emulsion has a solids content of from 10% to 40%.
  • the adjuvant may also include a first leveling agent and an antifoaming agent.
  • the first leveling agent is a polyurethane emulsion or an acrylic emulsion leveling agent, and the weight percentage of the first leveling agent is 0.01%-1%, and the mixture of the modified acrylic emulsion or the modified urethane acid emulsion and the auxiliary agent is 0.01%-1%, 01%-0. 5% ⁇ Preferably, it is 0. 1%-0. 5%.
  • the antifoaming agent used in the precoat film of the embodiment of the present invention may be a foaming agent which is commonly used in the art.
  • the polyurethane dispersion contains a second leveling agent, a film former, a thickener and a diluent.
  • the second leveling agent may be a silicone leveling agent
  • the film forming agent may be vinyl glycol butyl ether
  • the thickening agent may comprise an acrylate and/or methacrylate copolymer
  • the diluent may be Includes deionized water.
  • step one a biaxially stretched polyester layer or a biaxially stretched nylon layer is provided as the substrate layer 11.
  • Step 2 A flexible coating 12 comprising a mixture of a polyurethane dispersion and a curing agent is coated on the first side 111 of the substrate layer 11 by a coating apparatus to form the substrate 1.
  • Step 3 coating a polyethyleneimine aqueous solution prepared according to the above ratio on the second surface 112 of the substrate layer 11 and drying it with a drying device to cure the polyvinyl chloride imide in the substrate layer 11
  • the second side 112 is formed to form an intermediate layer
  • the intermediate layer 2 can be directly coated on the second surface 112 of the substrate layer 11, and the second surface 112 and the intermediate layer 2 can be ensured after drying. Cohesiveness between. 01 ⁇
  • the drying temperature can be set at 90 ° C, the thickness of the intermediate layer 2 after drying is about 0. 01 ⁇ m.
  • Step 4 The EVA hot melt adhesive layer 3 is hot pressed to the intermediate layer 2 by an extrusion composite device.
  • the substrate 1 carrying the cured intermediate layer 2 is fed to the recombination position through the guide rolls of the extrusion compounding line while the extruder extrudes the hot-melt adhesive layer 3.
  • An ozone generator is arranged at a composite position adjacent to the extrusion compounding line, and ozone generated by the ozone generator is sprayed onto the EVA casting film extruded by the extruder, the concentration of ozone is 40%, the power is 800 W, and the gas flow rate For 3.5 SCXFM, ozone causes some of the polar groups on the cast surface of the resin, and then the substrate 1 is combined with the extrusion of the intermeshing rolls which are cast through the composite position of the extrusion composite line to form a composite film.
  • Step 5 coating the modified acrylic emulsion or the mixture of the modified urethane acid emulsion and the auxiliary agent on the hot melt adhesive layer 3 by a coating device and drying to form the adhesion promoting layer 4. Thereby a preliminary film is obtained.
  • the surface of the hot melt adhesive layer 3 in contact with the adhesion promoting layer 4 is subjected to corona treatment to obtain a certain amount of polar groups.
  • the degree of corona treatment is indicated by the wetting tension (i.e., the dyne value), and the surface of the hot melt adhesive layer 4 in contact with the bonding layer 4 after the corona treatment is between 50 and 54.
  • the modified acrylic emulsion constituting the adhesion-promoting layer 4 or the mixture of the modified urethane acid emulsion and the auxiliary agent is subjected to high-speed dispersion treatment for 10-20 minutes, so that the respective substances in the adhesion-promoting layer 4 can be sufficiently mixed.
  • the adhesion-promoting layer 4 has a uniform adhesive force to ensure the bonding effect between the pre-coated film and the printed matter of the embodiment of the present invention.
  • the dry weight of the coating is 0. 1-0. 4g / m 2 .
  • the precoat film preparation method according to the embodiment of the present invention is not only simple in operation, but also effectively reduces the cost of precoat film preparation because the existing precoat film production line is fully utilized. Further, the precoat film prepared by the precoat film preparation method according to the embodiment of the present invention not only has a soft touch but also enhances the adhesion between the precoat film and the printed matter, and satisfies the requirements of the subsequent processing steps.
  • Embodiment 2 of the present invention differs from Embodiment 1 in order to improve the surface viscosity, it can
  • the second side of the substrate layer 11 is first subjected to a corona treatment to obtain a certain amount of a polar group such as a carbonyl group.
  • the surface of the second surface 112 of the substrate layer 11 after the corona treatment has a dyne value of 36 or more.
  • the second surface 112 of the corona-treated substrate layer 11 is coated with an aqueous solution of polyethyleneimine and dried, and the drying temperature is 85-95 °C.

Abstract

A precoating film and a preparation method thereof. The precoating film comprises a substrate layer (1) which includes a base layer (11) and a flexible coating layer (12), an intermediate layer (2) which is provided on the second surface of the base layer (11) and formed from polyethyleneimine aqueous solution, a hot-melt adhesive layer (3) which is provided on the surface of the intermediate layer (2) and formed from EVA、EEA、EAA or EMA, and an adhesion-promoting layer (4) which is provided on the surface of the hot-melt adhesive layer and formed from a modified acrylate emulsion or a mixture of a modified polyurethane emulsion and auxiliary agents.

Description

预涂膜及该预涂膜的制备方法  Precoat film and preparation method of the precoat film
技术领域 Technical field
本发明涉及印刷覆膜技术领域， 特别是涉及一种预涂膜及该预涂膜的制备方法。  The present invention relates to the field of printing film technology, and in particular to a precoat film and a method for preparing the precoat film.
背景技术 Background technique
印刷品覆膜是印后加工的重要手段， 它决定印刷产品的最终身价。 印刷品的覆膜工艺 是指用塑料薄膜覆盖在纸张印刷品上面， 中间使用粘合剂， 通过加热加压处理后， 使塑料 薄膜和纸张两种不同性质的物质粘合在一起， 形成纸 /塑合一的表面装饰加工技术。 它对印 刷品起保护和装饰作用， 被广泛应用于包装印刷领域， 如书刊封面、 宣传画册、 地图、 广 告礼品袋、 高级包装盒等的表面加工上。  Print film is an important means of post-press processing, which determines the final value of the printed product. The film coating process of the printed matter refers to covering the paper printed matter with a plastic film, and using an adhesive in the middle, after heat and pressure treatment, the two different properties of the plastic film and the paper are bonded together to form a paper/plastic combination. A surface decoration processing technology. It protects and decorates printed products and is widely used in the field of packaging and printing, such as book covers, brochures, maps, advertising gift bags, and advanced packaging boxes.
预涂膜可称为环境友好或清洁的覆膜技术， 可实现保护环境、 保护健康、 安全生产， 因此越来越受市场的青睐。  Pre-coated film can be called environmentally friendly or clean laminating technology, which can protect the environment, protect health and produce safely, so it is more and more popular in the market.
然而， 随着社会的发展和进步， 人们对印刷品的质量和表面装饰效果的要求也在不断 提高， 具有 "柔感" 、 "抗划伤" 的覆膜产品能表现出温暖、 华美及天鹅绒般的与众不同 的外观效果， 同时也传达着质感独特的触摸享受。 因而开发出迎合人们触感的覆膜材料， 也已成为热门研究方向。  However, with the development and progress of the society, people's requirements for the quality of the printed matter and the surface decoration effect are also constantly improving. The film products with "softness" and "scratch resistance" can express warmth, beauty and velvety. The unique appearance of the effect, but also conveys a unique touch of the texture. Therefore, the development of a film material that caters to people's touch has also become a hot research direction.
此外， 目前国内的预涂膜产品都是普通的 EVA型预涂膜， 对于低速手工覆膜工艺以及 不需进行轧线、 凹凸处理的产品， 普通预涂膜可以满足要求。 但对于使用日益广泛的全自 动高速覆膜工艺， 以及覆后进行轧线、 凹凸处理的产品， 普通预涂膜会表现出起泡、 脱层 等质量问题， 严重影响覆膜的成品率及工作效率。  In addition, the current domestic pre-coated film products are ordinary EVA pre-coated films. For low-speed manual laminating processes and products that do not require rolling and bumping, ordinary pre-coated films can meet the requirements. However, for the use of an increasingly wide-automatic high-speed laminating process, as well as products that are rolled and embossed after lamination, ordinary pre-coated films will exhibit quality problems such as blistering and delamination, which will seriously affect the yield and work of the film. effectiveness.
发明内容 Summary of the invention
本发明旨在至少在一定程度上解决上述技术问题之一或至少提供一种有用的商业选择。 为此， 本发明的一个目的在于提出一种具有柔软触感且与印刷品之间具有良好粘结力的预 涂膜。  The present invention is directed to solving at least some of the above technical problems or at least providing a useful commercial choice. To this end, it is an object of the present invention to provide a precoated film which has a soft touch and which has good adhesion to a print.
本发明的另一个目的在于提出一种制备上述预涂膜的制备方法。  Another object of the present invention is to provide a process for preparing the above precoated film.
根据本发明一方面实施例的预涂膜， 其特征在于， 包括： 基材层， 所述基材层包括： 底 材层， 所述底材层为双向拉伸聚酯层、 双向拉伸尼龙层或双向拉伸聚丙烯层； 以及柔性涂 层， 所述柔性涂层设置在所述底材层的第一面上且由聚氨酯分散体和固化剂的混合物形成， 在所述混合物中聚氨酯的重量百分比为 15%_30%且所述固化剂的重量百分比为 50%以下， 中 间层， 所述中间层设置在所述底材层的第二面上且由聚乙烯亚胺水溶液形成， 所述聚乙烯 亚胺的固含量为0. 4%-2. 5%且涂布干重为0. 007_0. 03^ 1112 ; 热熔胶层， 所述热熔胶层设置 在所述中间层上且由 EVA、 EEA、 EAA或 EMA形成;和增粘层， 所述增粘层设置在所述熔融胶 层上且由改性丙烯酸乳液或改性聚氨酯酸乳液与助剂的混合物形成， 其中所述改性丙烯酸 乳液或改性聚氨酯酸乳液的固含量为 50%以下， 所述助剂包括粘接促进剂， 所述粘接促进剂 的重量百分比为 0. 1%_10%。 A precoat film according to an embodiment of the present invention, comprising: a substrate layer, the substrate layer comprising: a substrate layer, the substrate layer being a biaxially stretched polyester layer, a biaxially stretched nylon a layer or biaxially oriented polypropylene layer; and a flexible coating disposed on the first side of the substrate layer and formed of a mixture of a polyurethane dispersion and a curing agent, polyurethane in the mixture a weight percentage of 15% to 30% and a weight percentage of the curing agent of 50% or less, an intermediate layer, the intermediate layer being disposed on the second surface of the substrate layer and formed of an aqueous solution of polyethyleneimine, Polyethylene The solid content of the imine is 0.4%-2. 5% and the dry weight of the coating is 0. 007_0. 03^ 1 112 ; a hot melt adhesive layer, the hot melt adhesive layer is disposed on the intermediate layer and Forming EVA, EEA, EAA or EMA; and an adhesion-promoting layer disposed on the molten rubber layer and formed of a modified acrylic emulsion or a mixture of a modified polyurethane acid emulsion and an auxiliary agent, wherein the modification 1%_10%。 The weight of the adhesion promoter is 0.1% _10%. The weight percentage of the adhesion promoter is 0.1% _10%.
由此，通过设置柔性涂层，根据本发明实施例的预涂膜的表面具有柔软触感且表面的轻 微划痕可逐渐自我修复， 可抗轻微磨损或划伤。 另外， 增粘层作为本发明实施例的预涂膜 与印刷品热压复合的表面， 不仅能够增强预涂膜与印刷品之间的粘结力， 满足后续加工工 序的要求， 并且扩展了预涂膜的使用范围。  Thus, by providing a flexible coating, the surface of the precoat film according to the embodiment of the present invention has a soft touch and the surface scratches can be gradually self-healing, and can resist slight abrasion or scratching. In addition, the adhesion-promoting layer as a surface of the pre-coating film and the printed matter of the embodiment of the present invention can not only enhance the adhesion between the pre-coating film and the printed matter, but also meet the requirements of the subsequent processing steps, and expand the pre-coating film. The scope of use.
另外， 根据本发明上述实施例的预涂膜还可以具有如下附加的技术特征：  Further, the precoat film according to the above embodiment of the present invention may further have the following additional technical features:
根据本发明的一个实施例， 当所述热熔胶层由 EVA形成时， 其中热熔胶层中的 VA重量 百分比为 10%_30%且熔融指数为 10_25g/10min。  According to an embodiment of the present invention, when the hot melt adhesive layer is formed of EVA, the VA weight percentage in the hot melt adhesive layer is 10% to 30% and the melt index is 10 to 25 g/10 min.
根据本发明的一个实施例， 所述粘接促进剂为萜烯类酚醛树脂、 硅烷偶联剂或乙烯-丙 烯酸乳液。  According to an embodiment of the present invention, the adhesion promoter is a terpene phenol resin, a silane coupling agent or an ethylene-acrylic acid emulsion.
根据本发明的一个实施例，所述助剂还包括第一流平剂，所述第一流平剂为聚氨酯乳液 类或丙烯酸乳液类流平剂， 所述第一流平剂的重量百分比为 0. 01%-1%。  重量。 The first leveling agent is 0. 01% by weight of the first leveling agent. The first leveling agent is 0. 01. %-1%.
根据本发明的一个实施例， 所述助剂还包括消泡剂。  According to an embodiment of the invention, the adjuvant further comprises an antifoaming agent.
根据本发明的一个实施例， 所述底材层的厚度为 8-50 μ πι， 所述柔性涂层的厚度为 2-10 μ πι， 热熔胶层的厚度为 8-30 μ πι， 增粘层的厚度为 0. 1-0. 5 μ m。  According to an embodiment of the present invention, the thickness of the substrate layer is 8-50 μπι, the thickness of the flexible coating layer is 2-10 μπι, and the thickness of the hot melt adhesive layer is 8-30 μπι. 5微米。 The thickness of the adhesive layer is 0. 1-0. 5 μ m.
根据本发明的一个实施例， 所述聚氨酯分散体中含有第二流平剂、成膜剂、增稠剂和稀 释剂。  According to an embodiment of the invention, the polyurethane dispersion contains a second leveling agent, a film former, a thickener and a diluent.
根据本发明的一个实施例，所述第二流平剂为有机硅类流平剂，所述成膜剂为乙二醇醚 类、 乙二醇醚酯类或酯醇类成膜剂， 所述增稠剂包括丙烯酸酯和 /或甲基丙烯酸酯共聚物， 所述稀释剂包括去离子水。  According to an embodiment of the present invention, the second leveling agent is a silicone leveling agent, and the film forming agent is a glycol ether, a glycol ether ester or an ester alcohol film forming agent. Thickeners include acrylate and/or methacrylate copolymers, including deionized water.
根据本发明的一个实施例， 所述聚乙烯亚胺的分子式为 (CH2CH2NH) n， 其中 n的取值范 围为使得平均分子量在 1000-10000之间。  According to an embodiment of the present invention, the polyethyleneimine has the formula (CH2CH2NH) n, wherein n is in a range such that the average molecular weight is between 1000 and 10,000.
根据本发明的一个实施例， 所述固化剂为氮丙啶或异氰酸酯类固化剂  According to an embodiment of the present invention, the curing agent is an aziridine or isocyanate curing agent.
根据本发明另一方面实施例的预涂膜的制备方法， 包括以下步骤：  A method of preparing a precoat film according to another embodiment of the present invention includes the following steps:
1 )提供底材层， 所述底材层为双向拉伸聚酯层、双向拉伸尼龙层或双向拉伸聚丙烯层; 2 ) 将包括聚氨酯分散体和固化剂的混合物的柔性涂层涂布在所述底材层的第一面上以 形成柔性层， 由所述底材层和所述柔性层构成基材层；  1) providing a substrate layer, which is a biaxially stretched polyester layer, a biaxially stretched nylon layer or a biaxially oriented polypropylene layer; 2) a flexible coating comprising a mixture of a polyurethane dispersion and a curing agent Laying on the first side of the substrate layer to form a flexible layer, the substrate layer and the flexible layer forming a substrate layer;
3 ) 在所述底材层的第二面上涂布聚乙烯亚胺水溶液并烘干， 以在所述底材层的第二面 上形成中间层；  3) coating a polyethyleneimine aqueous solution on the second side of the substrate layer and drying to form an intermediate layer on the second side of the substrate layer;
4 ) 在所述中间层上涂覆 EVA、 EEA、 EAA或 EMA以形成热熔胶层；  4) coating EVA, EEA, EAA or EMA on the intermediate layer to form a hot melt adhesive layer;
5 ) 在所述热熔胶层上涂布改性丙烯酸乳液或改性聚氨酯酸乳液与助剂的混合物并烘干 以形成增粘层， 从而得到预涂膜。 由此，根据本发明实施例的预涂膜制备方法不仅操作简单，且因为充分利用现有的预涂 膜生产线， 因此有效降低了预涂膜制备的成本。 另外， 根据本发明实施例的预涂膜制备方 法制备的预涂膜不仅具有柔软触感， 而且能够增强预涂膜与印刷品之间的粘附力， 满足后 续加工工序的要求。 5) coating a modified acrylic emulsion or a mixture of a modified urethane acid emulsion and an auxiliary agent on the hot melt adhesive layer and drying to form an adhesion-promoting layer, thereby obtaining a pre-coated film. Thus, the precoat film preparation method according to the embodiment of the present invention is not only simple in operation, but also effectively reduces the cost of precoat film preparation because the existing precoat film production line is fully utilized. In addition, the precoat film prepared by the precoat film preparation method according to the embodiment of the present invention not only has a soft touch, but also can enhance the adhesion between the precoat film and the printed matter, and satisfies the requirements of the subsequent processing steps.
另外， 根据本发明上述实施例的预涂膜的制备方法还可以具有如下附加的技术特征： 根据本发明的一个实施例， 所述题材层为双向拉伸聚丙烯层， 且所述步骤 3)包括： 3-1 ) 对所述底材层的第二面进行电晕处理， 使所述底材层的第二面的表面达因值达到 36以上；  In addition, the method for preparing a precoat film according to the above embodiment of the present invention may further have the following additional technical features: According to an embodiment of the present invention, the theme layer is a biaxially oriented polypropylene layer, and the step 3) The method includes: 3-1) performing corona treatment on the second surface of the substrate layer, so that the surface value of the second surface of the substrate layer reaches 36 or more;
3-2 ) 在经过电晕处理的所述底材层的第二面上涂布聚乙烯亚胺水溶液并烘干， 烘干温 度为 85-95°C。  3-2) A polyethyleneimine aqueous solution is coated on the second side of the corona-treated substrate layer and dried, and the drying temperature is 85-95 °C.
根据本发明的一个实施例， 所述步骤 5)包括：  According to an embodiment of the invention, the step 5) comprises:
5-1 ) 对所述热熔胶层的表面进行电晕处理， 使述热熔胶层的表面的达因值达到 50-54 之间；  5-1) corona treatment of the surface of the hot melt adhesive layer, so that the surface of the hot melt adhesive layer has a dyne value of 50-54;
5-2 ) 在经过电晕处理的所述热熔胶层的表面上涂布改性丙烯酸乳液或改性聚氨酯酸乳 液与助剂的混合物并烘干， 烘干温度为 70_95°C。  5-2) A mixture of a modified acrylic emulsion or a modified urethane emulsion and an auxiliary agent is coated on the surface of the corona-treated hot-melt adhesive layer and dried, and the drying temperature is 70-95 °C.
根据本发明的一个实施例， 所述步骤 5-2 ) 中， 在涂布之前对所述改性丙烯酸乳液或改 性聚氨酯酸乳液与助剂的混合物进行高速分散处理。  According to an embodiment of the present invention, in the step 5-2), the modified acrylic emulsion or the mixture of the modified urethane emulsion and the auxiliary agent is subjected to a high-speed dispersion treatment before coating.
根据本发明的一个实施例， 所述高速分散处理的时间为 10-20分钟。  According to an embodiment of the present invention, the time of the high speed dispersion treatment is 10-20 minutes.
本发明的附加方面和优点将在下面的描述中部分给出， 部分将从下面的描述中变得明 显， 或通过本发明的实践了解到。  The additional aspects and advantages of the invention will be set forth in part in the description which follows.
附图说明 DRAWINGS
本发明的上述和 /或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和 容易理解， 其中：  The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from
图 1是根据本发明实施例的预涂膜的结构示意图；  1 is a schematic structural view of a precoat film according to an embodiment of the present invention;
图 2是根据本发明实施例的预涂膜的基材层的结构示意图；  2 is a schematic structural view of a substrate layer of a precoat film according to an embodiment of the present invention;
图 3是根据本发明实施例的预涂膜的制备方法的流程图；  3 is a flow chart of a method of preparing a precoat film according to an embodiment of the present invention;
图 4是根据本发明实施例的预涂膜的制备方法中步骤五的流程图。  4 is a flow chart showing the fifth step in the method of preparing a precoat film according to an embodiment of the present invention.
具体实施方式 detailed description
下面详细描述本发明的实施例，所述实施例的示例在附图中示出。下面通过参考附图描 述的实施例是示例性的， 旨在用于解释本发明， 而不能理解为对本发明的限制。  Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.
此外， 术语 "第一" 、 "第二"仅用于描述目的， 而不能理解为指示或暗示相对重要性 或者隐含指明所指示的技术特征的数量。 由此， 限定有 "第一" 、 "第二" 的特征可以明 示或者隐含地包括一个或者更多个该特征。 在本发明的描述中， "多个" 的含义是两个或 两个以上， 除非另有明确具体的限定。 In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Or implicitly indicate the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "plurality" is two or more, unless specifically defined otherwise.
在本发明中， 除非另有明确的规定和限定，第一特征在第二特征之 "上"或之 "下"可 以包括第一和第二特征直接接触， 也可以包括第一和第二特征不是直接接触而是通过它们 之间的另外的特征接触。 而且， 第一特征在第二特征 "之上" 、 "上方"和 "上面"包括 第一特征在第二特征正上方和斜上方， 或仅仅表示第一特征水平高度高于第二特征。 第一 特征在第二特征 "之下" 、 "下方"和 "下面"包括第一特征在第二特征正上方和斜上方， 或仅仅表示第一特征水平高度小于第二特征。  In the present invention, the first feature "on" or "under" the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise explicitly defined and defined. It is not in direct contact but through additional features between them. Moreover, the first feature "aboves", "above" and "above" the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is less than the second feature.
下面参考图 1-2来描述根据本发明实施例的预涂膜。  A precoat film according to an embodiment of the present invention will be described below with reference to Figs. 1-2.
如图 1和图 2所示， 根据本发明实施例的预涂膜， 包括基材层 1、 中间层 2、 热熔胶层 3和增粘层 4。  As shown in Figs. 1 and 2, a precoat film according to an embodiment of the present invention comprises a substrate layer 1, an intermediate layer 2, a hot melt adhesive layer 3, and an adhesion promoting layer 4.
具体而言， 基材层 1包括底材层 11和柔性涂层 12。  Specifically, the substrate layer 1 includes a substrate layer 11 and a flexible coating 12.
其中， 底材层 11可以为双向拉伸聚酯（B0PET)层、 双向拉伸尼龙（B0PA)层或双向拉 伸聚丙烯 （B0PP) 层。 底材层 11的厚度可以为 8_50 μ ιιι。 其中， 当底材层 11为 B0PET时， B0PET的厚度优选为 9-12 μ πι; 当底材层 11为 B0PA时， B0PA的厚度优选为 12-20 μ m; 当 底材层 11为 B0PP时， B0PP的厚度优选为 12-15 μ m。  The substrate layer 11 may be a biaxially stretched polyester (B0PET) layer, a biaxially stretched nylon (B0PA) layer or a biaxially stretched polypropylene (BOPP) layer. The thickness of the substrate layer 11 can be 8_50 μ ιιι. Wherein, when the substrate layer 11 is B0PET, the thickness of the B0PET is preferably 9-12 μπι; when the substrate layer 11 is B0PA, the thickness of the B0PA is preferably 12-20 μm; when the substrate layer 11 is B0PP The thickness of B0PP is preferably 12-15 μm.
柔性涂层 12设置在底材层 11的第一面 111上且由聚氨酯分散体和固化剂的混合物形 成。 在混合物中聚氨酯的重量百分比为 15%_30%且固化剂的重量百分比为 50%以下。 固化剂 可以采用氮丙啶或异氰酸酯类固化剂。  A flexible coating 12 is disposed on the first side 111 of the substrate layer 11 and is formed from a mixture of a polyurethane dispersion and a curing agent. The weight percentage of the polyurethane in the mixture is 15% to 30% and the weight percentage of the curing agent is 50% or less. The curing agent may be an aziridine or an isocyanate curing agent.
柔性涂层 12的厚度为 2-10 μ ιιι， 优选为 2. 5-4 μ ιιι。  The flexible coating 12 has a thickness of 2 to 10 μm, preferably 2. 5 to 4 μ.
中间层 2设置在底材层 11的第二面 112上且由聚乙烯亚胺（ΡΕΙ )水溶液形成。聚乙烯 亚胺的固含量为 0. 4%-2. 5%且涂布干重为 0. 007-0. 03g/ , 优选为 0. 009-0. 01 lg/ m2。 The intermediate layer 2 is disposed on the second side 112 of the substrate layer 11 and is formed of an aqueous solution of polyethyleneimine. 009-0. 01 lg/ m 2 . The 00-0. 01 lg / m 2 .
聚乙烯亚胺的分子式为（CH2CH2NH) n， 其中 n 的取值范围为使得平均分子量在 1000-10000之间。  The molecular formula of polyethyleneimine is (CH2CH2NH) n, wherein n is in the range of 1000-10000.
热熔胶层 3设置在中间层 2上且由乙烯-醋酸乙烯共聚物（EVA)、乙烯-醋酸丙烯共聚物 (EEA)、 乙烯-丙烯酸共聚物 （EAA) 或乙烯 -甲基丙烯酸 （EMA) 形成。 当所述热熔胶层由 EVA构成时， 其中的 VA重量百分比为 10%_30%且熔融指数为 10_25g/10min， 优选地， 热熔 胶树脂中的 VA重量百分比为 15%_20%， 并且熔融指数为 10-20g/10min。 The hot melt adhesive layer 3 is disposed on the intermediate layer 2 and is composed of ethylene-vinyl acetate copolymer (EVA), ethylene-propylene acetate copolymer (EEA), ethylene-acrylic acid copolymer (EAA) or ethylene-methacrylic acid (EMA). form. When the hot melt adhesive layer is composed of EVA, the VA weight percentage thereof is 10% _30% and the melt index is 10 _25 g/10 min, preferably, the VA weight percentage in the hot melt adhesive resin is 15% _20%, and melting The index is 10-20 g /10 min.
热熔胶层 3的厚度为 8-30 μ ιιι， 优选为 12-19 μ ιιι。  The thickness of the hot melt adhesive layer 3 is 8-30 μ ι, preferably 12-19 μ ι.
增粘层 4设置在熔融胶层 3上并与待覆膜的印刷品表面直接接触。增粘层 4由改性丙烯 酸乳液或改性聚氨酯酸乳液与助剂的混合物形成。  The adhesion-promoting layer 4 is disposed on the molten rubber layer 3 and is in direct contact with the surface of the printed matter to be coated. The adhesion-promoting layer 4 is formed of a modified acrylic emulsion or a mixture of a modified polyurethane acid emulsion and an auxiliary.
改性丙烯酸乳液或改性聚氨酯酸乳液的固含量为 50%以下。 助剂包括粘接促进剂， 粘接 促进剂的重量百分比占该混合物的 0. 1%_10%， 优选为 0. 5%_5%。  The modified acrylic emulsion or the modified polyurethane acid emulsion has a solid content of 50% or less. The 5% by weight of the mixture is preferably 0.1% _10%, preferably 0.5% 5% by weight.
增粘层 4的厚度为 0. 1-0. 5 μ ιιι (涂布干重为 0. 05-0. 5g/m2 )， 优选为 0. 2_0. 4 μ m (涂 布干重为 0. 1-0. 4g/m 增粘层 4 使本发明实施例的预涂膜具有更好的粘结性并且能够复合在多种质地的待覆 膜印刷品的表面， 扩大了使用范围。 另外， 增粘层 4还使本发明实施例的预涂膜表面润湿 张力低， 适合后续的轧线、 凹凸等处理以及全自动高速覆膜工艺的要求， 不会产生气泡或 脱层等问题。 The thickness of the adhesion-promoting layer is 0. 1-0. 5 μ ιιι (coating dry weight is 0. 05-0. 5g / m 2 ), preferably 0. 2_0. 4 μ m (coating dry weight is 0 1-0. 4g/m The adhesion-promoting layer 4 allows the pre-coated film of the embodiment of the present invention to have better adhesion and can be laminated on the surface of a plurality of textures to be coated, thereby expanding the range of use. In addition, the adhesion-promoting layer 4 also has a low surface wetting tension of the pre-coated film of the embodiment of the invention, and is suitable for subsequent processing such as rolling line, unevenness, and automatic high-speed film coating process, and does not cause problems such as bubbles or delamination. .
由此， 通过设置柔性涂层 12， 根据本发明实施例的预涂膜的表面具有柔软触感且表面 的轻微划痕可逐渐自我修复， 可抗轻微磨损或划伤。 另外， 增粘层 4作为本发明实施例的 预涂膜与印刷品热压复合的表面， 不仅能够增强预涂膜与印刷品之间的粘结力， 满足后续 加工工序的要求， 并且扩展了预涂膜的使用范围。  Thus, by providing the flexible coating 12, the surface of the precoated film according to the embodiment of the present invention has a soft touch and the slight scratches of the surface can be gradually self-healing, and can resist slight abrasion or scratching. In addition, the adhesion-promoting layer 4 as a surface of the pre-coated film and the printed article of the embodiment of the present invention can not only enhance the adhesion between the pre-coated film and the printed matter, but also meet the requirements of the subsequent processing steps, and expand the pre-coating. The range of use of the film.
根据本发明的一些实施例， 粘接促进剂为萜烯类酚醛树脂、 硅烷偶联剂或乙烯-丙烯酸 乳液， 优选为乙烯-丙烯酸乳液， 其中乙烯-丙烯酸乳液的固含量为 10%_40%。  According to some embodiments of the invention, the adhesion promoter is a terpene phenolic resin, a silane coupling agent or an ethylene-acrylic emulsion, preferably an ethylene-acrylic emulsion, wherein the ethylene-acrylic emulsion has a solids content of from 10% to 40%.
另外，助剂还可以包括第一流平剂和消泡剂。其中第一流平剂为聚氨酯乳液类或丙烯酸 乳液类流平剂， 并且第一流平剂的重量百分比为改性丙烯酸乳液或改性聚氨酯酸乳液与助 剂的混合物的 0. 01%-1%， 优选为 0. 1%-0. 5%。  Additionally, the adjuvant may also include a first leveling agent and an antifoaming agent. 01%-1%, The first leveling agent is a polyurethane emulsion or an acrylic emulsion leveling agent, and the weight percentage of the first leveling agent is 0.01%-1%, and the mixture of the modified acrylic emulsion or the modified urethane acid emulsion and the auxiliary agent is 0.01%-1%, 01%-0. 5%。 Preferably, it is 0. 1%-0. 5%.
本发明实施例的预涂膜采用的消泡剂可以采用本领域常用的发泡剂。  The antifoaming agent used in the precoat film of the embodiment of the present invention may be a foaming agent which is commonly used in the art.
聚氨酯分散体中含有第二流平剂、成膜剂、增稠剂和稀释剂。其中第二流平剂可以采用 有机硅类流平剂， 成膜剂可采用乙烯基乙二醇丁基醚， 增稠剂可以包括丙烯酸酯和 /或甲基 丙烯酸酯共聚物， 而稀释剂可以包括去离子水。 下面根据图 3和图 4来描述根据本发明实施例的预涂膜的制备方法。  The polyurethane dispersion contains a second leveling agent, a film former, a thickener and a diluent. Wherein the second leveling agent may be a silicone leveling agent, the film forming agent may be vinyl glycol butyl ether, the thickening agent may comprise an acrylate and/or methacrylate copolymer, and the diluent may be Includes deionized water. A method of preparing a precoat film according to an embodiment of the present invention will be described below with reference to Figs. 3 and 4.
实施例 1  Example 1
如图 3所示， 步骤一： 提供双向拉伸聚酯层或双向拉伸尼龙层作为底材层 11。  As shown in Fig. 3, step one: a biaxially stretched polyester layer or a biaxially stretched nylon layer is provided as the substrate layer 11.
步骤二： 将包括聚氨酯分散体和固化剂的混合物的柔性涂层 12利用涂布设备涂布在底 材层 11的第一面 111上， 以形成基材 1。  Step 2: A flexible coating 12 comprising a mixture of a polyurethane dispersion and a curing agent is coated on the first side 111 of the substrate layer 11 by a coating apparatus to form the substrate 1.
步骤三： 在底材层 11的第二面 112上涂布按上述配比制备的聚乙烯亚胺水溶液并利用 烘干设备进行烘干处理， 使聚氯乙烯亚胺固化在在底材层 11的第二面 112上以形成中间层 Step 3: coating a polyethyleneimine aqueous solution prepared according to the above ratio on the second surface 112 of the substrate layer 11 and drying it with a drying device to cure the polyvinyl chloride imide in the substrate layer 11 The second side 112 is formed to form an intermediate layer
2 o 2 o
由于聚酯层和拉伸尼龙层均是极性材料， 因此在底材层 11的第二面 112上可以直接涂 布中间层 2，在烘干后能够保证第二面 112与中间层 2之间的粘结性。烘干温度可设在 90°C， 烘干后的中间层 2的厚度约为 0. 01 μ m。  Since both the polyester layer and the stretched nylon layer are polar materials, the intermediate layer 2 can be directly coated on the second surface 112 of the substrate layer 11, and the second surface 112 and the intermediate layer 2 can be ensured after drying. Cohesiveness between. 01微米。 The drying temperature can be set at 90 ° C, the thickness of the intermediate layer 2 after drying is about 0. 01 μ m.
步骤四： 通过挤出复合设备将 EVA热熔胶层 3热压复合到中间层 2上。  Step 4: The EVA hot melt adhesive layer 3 is hot pressed to the intermediate layer 2 by an extrusion composite device.
具体而言， 将载有固化的中间层 2的基材 1通过挤出复合生产线的导辊被送至复合位 置， 同时挤出机挤出热熔胶层 3。 在邻近挤出复合生产线的复合位置处设有臭氧发生器， 由 臭氧发生器产生的臭氧喷吹到挤出机挤出的 EVA流延膜上， 臭氧的浓度为 40%， 功率 800W, 气体流量为 3. 5SCXFM,臭氧使树脂的流延表面产生一些极性基团，然后基材 1与流延通过挤 出复合生产线复合位置的啮合辊的挤压相结合， 形成复合膜。  Specifically, the substrate 1 carrying the cured intermediate layer 2 is fed to the recombination position through the guide rolls of the extrusion compounding line while the extruder extrudes the hot-melt adhesive layer 3. An ozone generator is arranged at a composite position adjacent to the extrusion compounding line, and ozone generated by the ozone generator is sprayed onto the EVA casting film extruded by the extruder, the concentration of ozone is 40%, the power is 800 W, and the gas flow rate For 3.5 SCXFM, ozone causes some of the polar groups on the cast surface of the resin, and then the substrate 1 is combined with the extrusion of the intermeshing rolls which are cast through the composite position of the extrusion composite line to form a composite film.
再经过拉伸、 冷却、 修边后热熔胶层的厚度为 16 μ πι。 步骤五：通过涂布设备在热熔胶层 3上涂布改性丙烯酸乳液或改性聚氨酯酸乳液与助剂 的混合物并烘干以形成增粘层 4。 从而获得预备膜。 After stretching, cooling, and trimming, the thickness of the hot melt adhesive layer is 16 μm. Step 5: coating the modified acrylic emulsion or the mixture of the modified urethane acid emulsion and the auxiliary agent on the hot melt adhesive layer 3 by a coating device and drying to form the adhesion promoting layer 4. Thereby a preliminary film is obtained.
另外， 考虑到热熔胶层 3的极性较弱， 为了使产品在应用中（即本发明实施例的预涂膜 与印刷品复合过程中） 具有良好的粘结力， 优选地， 如图 4所示， 在热熔胶层 3上涂布增 粘层 4之前， 对热熔胶层 3与增粘层 4相接触的表面进行电晕处理， 以获得一定量的极性 基团。 以润湿张力 （即达因值） 表示电晕处理程度， 则电晕处理后热熔胶层 4 与粘结层 4 相接触的表面达因值在 50-54之间。  In addition, considering that the polarity of the hot melt adhesive layer 3 is weak, in order to make the product have good adhesion in application (ie, the precoat film of the embodiment of the present invention and the printed matter process), preferably, as shown in FIG. 4 As shown, before the adhesion promoting layer 4 is applied on the hot melt adhesive layer 3, the surface of the hot melt adhesive layer 3 in contact with the adhesion promoting layer 4 is subjected to corona treatment to obtain a certain amount of polar groups. The degree of corona treatment is indicated by the wetting tension (i.e., the dyne value), and the surface of the hot melt adhesive layer 4 in contact with the bonding layer 4 after the corona treatment is between 50 and 54.
在涂布前，对构成增粘层 4的改性丙烯酸乳液或改性聚氨酯酸乳液与助剂的混合物进行 10-20分钟高速分散处理， 能够使增粘层 4中的各物质充分混合， 使增粘层 4具有均匀的粘 结力， 保证本发明实施例的预涂膜与印刷品之间的粘结效果。  Before the coating, the modified acrylic emulsion constituting the adhesion-promoting layer 4 or the mixture of the modified urethane acid emulsion and the auxiliary agent is subjected to high-speed dispersion treatment for 10-20 minutes, so that the respective substances in the adhesion-promoting layer 4 can be sufficiently mixed. The adhesion-promoting layer 4 has a uniform adhesive force to ensure the bonding effect between the pre-coated film and the printed matter of the embodiment of the present invention.
在经过电晕处理的热熔胶层 4 的表面上涂布经高速分散处理过的改性丙烯酸乳液或改 性聚氨酯酸乳液与助剂的混合物并烘干， 烘干温度为 70-95°C， 烘干后增粘层 4 的厚度为 0. 2-0. 4 m, 涂布干重为 0. 1-0. 4g/m2。 Coating a surface of the corona-treated hot-melt adhesive layer 4 with a high-speed dispersion-treated modified acrylic emulsion or a modified polyurethane acid emulsion and an auxiliary agent, and drying at a temperature of 70-95 ° C I. 4g/m 2。 The dry weight of the coating is 0. 1-0. 4g / m 2 .
由此，根据本发明实施例的预涂膜制备方法不仅操作简单，且因为充分利用现有的预涂 膜生产线， 因此有效降低了预涂膜制备的成本。 另外， 根据本发明实施例的预涂膜制备方 法制备的预涂膜不仅具有柔软触感， 而且能够增强预涂膜与印刷品之间的粘附力， 满足后 续加工工序的要求。  Thus, the precoat film preparation method according to the embodiment of the present invention is not only simple in operation, but also effectively reduces the cost of precoat film preparation because the existing precoat film production line is fully utilized. Further, the precoat film prepared by the precoat film preparation method according to the embodiment of the present invention not only has a soft touch but also enhances the adhesion between the precoat film and the printed matter, and satisfies the requirements of the subsequent processing steps.
实施例 2  Example 2
本发明实施例 2与实施例 1的区别在于底材层 11采用双向拉伸聚丙烯层。 由于聚丙烯 属于非极性材料， 为了改善其表面可粘性， 可以  The difference between Embodiment 2 of the present invention and Embodiment 1 is that the substrate layer 11 is a biaxially oriented polypropylene layer. Since polypropylene is a non-polar material, in order to improve the surface viscosity, it can
在步骤三实施之前， 先对底材层 11的第二面进行电晕处理， 以获得一定量的如羰基类 的极性基团。 电晕处理后底材层 11的第二面 112的表面的达因值能够达到 36以上。  Prior to the implementation of step three, the second side of the substrate layer 11 is first subjected to a corona treatment to obtain a certain amount of a polar group such as a carbonyl group. The surface of the second surface 112 of the substrate layer 11 after the corona treatment has a dyne value of 36 or more.
经过电晕处理的底材层 11的第二面 112上涂布聚乙烯亚胺水溶液并烘干， 烘干温度为 85- 95°C。  The second surface 112 of the corona-treated substrate layer 11 is coated with an aqueous solution of polyethyleneimine and dried, and the drying temperature is 85-95 °C.
实施例 2中其他步骤均与实施例 1中相应步骤相同， 在此不再赘述。  The other steps in the embodiment 2 are the same as the corresponding steps in the embodiment 1, and are not described herein again.
在本说明书的描述中， 参考术语 "一个实施例" 、 "一些实施例" 、 "示例" 、 "具 体示例" 、 或 "一些示例"等的描述意指结合该实施例或示例描述的具体特征、 结构、 材 料或者特点包含于本发明的至少一个实施例或示例中。 在本说明书中， 对上述术语的示意 性表述不一定指的是相同的实施例或示例。 而且， 描述的具体特征、 结构、 材料或者特点 可以在任何的一个或多个实施例或示例中以合适的方式结合。  In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means specific features described in connection with the embodiments or examples. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.
尽管上面已经示出和描述了本发明的实施例， 可以理解的是， 上述实施例是示例性的， 不能理解为对本发明的限制， 本领域的普通技术人员在不脱离本发明的原理和宗旨的情况 下在本发明的范围内可以对上述实施例进行变化、 修改、 替换和变型。  Although the embodiments of the present invention have been shown and described, it is understood that the foregoing embodiments are illustrative and not restrictive Variations, modifications, alterations and variations of the above-described embodiments are possible within the scope of the invention.

Claims

权利要求书 claims
1、 一种预涂膜， 其特征在于， 包括： 1. A pre-coated film, characterized in that it includes:
基材层， 所述基材层包括： Base material layer, the base material layer includes:
底材层，所述底材层为双向拉伸聚酯层、双向拉伸尼龙层或双向拉伸聚丙烯层； 柔性涂层，所述柔性涂层设置在所述底材层的第一面上且由聚氨酯分散体和固 化剂混合物形成， 在所述混合物中聚氨酯的重量百分比为 15%_30%且所述固化剂的 重量百分比为 50%以下； The substrate layer is a biaxially stretched polyester layer, a biaxially stretched nylon layer or a biaxially stretched polypropylene layer; a flexible coating, the flexible coating is provided on the first side of the substrate layer and formed from a polyurethane dispersion and a curing agent mixture, in which the weight percentage of polyurethane is 15% to 30% and the weight percentage of the curing agent is less than 50%;
中间层， 所述中间层设置在所述底材层的第二面上且由聚乙烯亚胺水溶液形成， 所 述聚乙烯亚胺的固含量为 0. 4%- 2. 5%且涂布干重为 0. 007-0. 03g/ m2 ; Intermediate layer, the intermediate layer is provided on the second surface of the substrate layer and is formed of a polyethyleneimine aqueous solution, the solid content of the polyethyleneimine is 0.4%-2.5% and is coated Dry weight is 0. 007-0. 03g/m2 ;
热熔胶层， 所述热熔胶层设置在所述中间层上且由 EVA、 EEA、 EAA或 EMA形成；和 增粘层，所述增粘层设置在所述熔融胶层上且由改性丙烯酸乳液或改性聚氨酯酸乳 液与助剂的混合物形成， 其中所述改性丙烯酸乳液或改性聚氨酯酸乳液的固含量为 50% 以下， 所述助剂包括粘接促进剂， 所述粘接促进剂的重量百分比为 0. 1%_ 10%。 A hot melt adhesive layer, the hot melt adhesive layer is arranged on the middle layer and is formed of EVA, EEA, EAA or EMA; and a tackifier layer, the tackifier layer is arranged on the molten adhesive layer and is formed of EVA, EEA, EAA or EMA; Formed by a mixture of acrylic emulsion or modified polyurethane acid emulsion and auxiliaries, wherein the solid content of the modified acrylic emulsion or modified polyurethane acid emulsion is less than 50%, the auxiliary agent includes an adhesion promoter, and the adhesion promoter The weight percentage of the contact accelerator is 0.1%_10%.
2、 根据权利要求 1所述的预涂膜， 其特征在于： 当所述热熔胶层由 EVA形成时， 其中热熔胶层中的 VA重量百分比为 10%_30%且熔融指数为 10-25g/10min。 2. The pre-coated film according to claim 1, characterized in that: when the hot melt adhesive layer is formed of EVA, the VA weight percentage in the hot melt adhesive layer is 10%-30% and the melt index is 10- 25g/10min.
3、 根据权利要求 1所述的预涂膜， 其特征在于： 所述粘接促进剂为萜烯类酚醛树 月旨、 硅烷偶联剂或乙烯-丙烯酸乳液。 3. The pre-coated film according to claim 1, characterized in that: the adhesion accelerator is a terpene phenolic resin, a silane coupling agent or an ethylene-acrylic acid emulsion.
4、 根据权利要求 1所述的预涂膜， 其特征在于： 所述助剂还包括第一流平剂， 所 述第一流平剂为聚氨酯乳液类或丙烯酸乳液类流平剂，所述第一流平剂的重量百分比为 0. 01%_1%。 4. The pre-coated film according to claim 1, characterized in that: the auxiliary agent further includes a first leveling agent, and the first leveling agent is a polyurethane emulsion or acrylic emulsion leveling agent. The weight percentage of the leveling agent is 0.01%_1%.
5、 根据权利要求 1所述的预涂膜， 其特征在于： 所述助剂还包括消泡剂。 5. The pre-coated film according to claim 1, characterized in that: the auxiliary agent further includes a defoaming agent.
6、 根据权利要求 1所述的预涂膜， 其特征在于： 所述底材层的厚度为 8-50 μ πι， 所述柔性涂层的厚度为 2-10 μ πι，热熔胶层的厚度为 8-30 μ πι，增粘层的厚度为 0. 1_0. 5 μ m。 6. The pre-coated film according to claim 1, characterized in that: the thickness of the substrate layer is 8-50 μm, the thickness of the flexible coating is 2-10 μm, and the thickness of the hot melt adhesive layer is The thickness is 8-30 μ m, and the thickness of the adhesion-promoting layer is 0. 1_0. 5 μ m.
7、 根据权利要求 1所述的预涂膜， 其特征在于： 所述聚氨酯分散体中含有第二流 平剂、 成膜剂、 增稠剂和稀释剂。 7. The pre-coating film according to claim 1, characterized in that: the polyurethane dispersion contains a second leveling agent, a film-forming agent, a thickener and a diluent.
8、 根据权利要求 6所述的预涂膜， 其特征在于： 所述第二流平剂为有机硅类流平 剂， 所述成膜剂为乙二醇醚类、 乙二醇醚酯类或酯醇类成膜剂， 所述增稠剂包括丙烯酸 酯和 /或甲基丙烯酸酯共聚物， 所述稀释剂包括去离子水。 8. The precoating film according to claim 6, characterized in that: the second leveling agent is a silicone leveling agent, and the film-forming agent is a glycol ether or a glycol ether ester. Or ester alcohol film-forming agent, the thickener includes acrylate and/or methacrylate copolymer, and the diluent includes deionized water.
9、 根据权利要求 1 所述的预涂膜， 其特征在于： 所述聚乙烯亚胺的分子式为 9. The pre-coated film according to claim 1, characterized in that: the molecular formula of polyethyleneimine is
(CH2CH2NH) n , 其中 n的取值范围为使得平均分子量在 1000- 10000之间。 (CH2CH2NH) n , where the value range of n is such that the average molecular weight is between 1000-10000.
10、 根据权利要求 1所述的预涂膜， 其特征在于， 所述固化剂为氮丙啶或异氰酸酯 类固化剂。 10. The precoating film according to claim 1, characterized in that the curing agent is an aziridine or isocyanate curing agent.
11、 一种预涂膜的制备方法， 其特征在于， 包括以下步骤： 11. A method for preparing a pre-coated film, characterized in that it includes the following steps:
1 ) 提供底材层， 所述底材层为双向拉伸聚酯层、 双向拉伸尼龙层或双向拉伸聚丙 烯层； 1) Provide a substrate layer, which is a biaxially stretched polyester layer, a biaxially stretched nylon layer or a biaxially stretched polypropylene layer olefin layer;
2 ) 将包括聚氨酯分散体和固化剂的混合物的柔性涂层涂布在所述底材层的第一面 上以形成柔性层， 由所述底材层和所述柔性层构成基材层； 2) Coating a flexible coating including a mixture of polyurethane dispersion and curing agent on the first side of the substrate layer to form a flexible layer, and the substrate layer and the flexible layer constitute the substrate layer;
3 ) 在所述底材层的第二面上涂布聚乙烯亚胺水溶液并烘干， 以在所述底材层的第 二面上形成中间层； 3) Coat the polyethyleneimine aqueous solution on the second surface of the substrate layer and dry it to form an intermediate layer on the second surface of the substrate layer;
4 ) 在所述中间层上涂覆 EVA、 EEA、 EAA或 EMA以形成热熔胶层； 和 4) Coating EVA, EEA, EAA or EMA on the intermediate layer to form a hot melt adhesive layer; and
5 ) 在所述热熔胶层上涂布改性丙烯酸乳液或改性聚氨酯酸乳液与助剂的混合物并 烘干以形成增粘层， 从而得到预涂膜。 5) Coat the mixture of modified acrylic emulsion or modified polyurethane acid emulsion and additives on the hot melt adhesive layer and dry it to form a tackifier layer, thereby obtaining a pre-coated film.
12、 根据权利要求 11所述的预涂膜制备方法， 其特征在于， 其中， 所述题材层为 双向拉伸聚丙烯层， 且所述步骤 3)包括： 12. The method for preparing a pre-coated film according to claim 11, wherein the subject layer is a biaxially stretched polypropylene layer, and the step 3) includes:
3-1 ) 对所述底材层的第二面进行电晕处理， 使所述底材层的第二面的表面达因值 达到 36以上； 3-1) Perform corona treatment on the second side of the substrate layer so that the surface dyne value of the second side of the substrate layer reaches above 36;
3-2 ) 在经过电晕处理的所述底材层的第二面上涂布聚乙烯亚胺水溶液并烘干， 烘 干温度为 85-95 °C。 3-2) Coat the polyethyleneimine aqueous solution on the second surface of the corona-treated substrate layer and dry it at a drying temperature of 85-95°C.
13、 根据权利要求 11所述的预涂膜制备方法， 其特征在于， 所述步骤 5)包括： 13. The precoating film preparation method according to claim 11, characterized in that the step 5) includes:
5-1 ) 对所述热熔胶层的表面进行电晕处理， 使述热熔胶层的表面的达因值达到 50-54之间; 5-1) Perform corona treatment on the surface of the hot melt adhesive layer so that the dyne value of the surface of the hot melt adhesive layer reaches between 50-54;
5-2 ) 在经过电晕处理的所述热熔胶层的表面上涂布改性丙烯酸乳液或改性聚氨酯 酸乳液与助剂的混合物并烘干， 烘干温度为 70_95 °C。 5-2) Coat the mixture of modified acrylic emulsion or modified polyurethane acid emulsion and additives on the surface of the corona-treated hot melt adhesive layer and dry it at a drying temperature of 70_95 °C.
14、 根据权利要求 13所述的预涂膜制备方法， 其特征在于： 所述步骤 5-2 ) 中， 在涂布之前对所述改性丙烯酸乳液或改性聚氨酯酸乳液与助剂的混合物进行高速分散 处理。 14. The pre-coating film preparation method according to claim 13, characterized in that: in step 5-2), the mixture of the modified acrylic emulsion or modified polyurethane acid emulsion and auxiliaries is prepared before coating. Perform high-speed dispersion processing.
15、 根据权利要求 14所述的预涂膜制备方法， 其特征在于： 所述高速分散处理的 时间为 10-20分钟。 15. The precoating film preparation method according to claim 14, characterized in that: the time of the high-speed dispersion treatment is 10-20 minutes.
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