CN110511641B - BOPA (biaxially-oriented polyamide) pre-coating film for enhancing adhesive force of UV (ultraviolet) ink and preparation method thereof - Google Patents
BOPA (biaxially-oriented polyamide) pre-coating film for enhancing adhesive force of UV (ultraviolet) ink and preparation method thereof Download PDFInfo
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C09D133/26—Homopolymers or copolymers of acrylamide or methacrylamide
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- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/24—Homopolymers or copolymers of amides or imides
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Abstract
The invention relates to the technical field of printing ink coatings, in particular to a BOPA (biaxially-oriented polyamide) pre-coating film for enhancing the adhesive force of UV (ultraviolet) ink and a preparation method thereof, wherein the BOPA pre-coating film for enhancing the adhesive force of the UV ink comprises a polyamide film layer and a coating layer, and the coating layer consists of aqueous acrylamide copolymer emulsion, an aqueous cross-linking agent and water; the proportion of the water-based acrylamide copolymer emulsion, the water-based cross-linking agent and the water is as follows: 9-11:0.3-0.5:9-11. The BOPA precoating film for enhancing the adhesive force of the UV ink, which is prepared by the invention, has the advantages that the printing firmness of the UV ink on the BOPA film is improved, the requirements of subsequent processing procedures are met, the problem that the UV printing ink is easy to fall off in the industry is solved, the preparation method and the coating process are simple, the improvement of the adhesive force of the UV ink of the coating layer is very obvious, and the application prospect is wide.
Description
Technical Field
The invention relates to the technical field of printing ink coatings, in particular to a BOPA (biaxially-oriented polyamide) precoating film for enhancing the adhesive force of UV (ultraviolet) ink and a preparation method thereof.
Background
A brand-new green technology ultraviolet radiation curing technology has been developed in the 70 s, and the ultraviolet curing ink produced by the technology, referred to as UV ink for short, has the advantages of no organic compound Volatile (VOC), small environmental pollution, high curing speed, energy conservation, suitability for high-speed automatic production and the like. The traditional ink is easy to volatilize, has low curing speed and is not beneficial to environmental protection, so the UV ink can be said to be a substitute of the traditional ink.
With the development of modern technology, the UV ink becomes a relatively mature ink technology, and the application range is increasingly expanded. However, because the UV ink uses ultraviolet light as an energy source, a photoinitiator in the ink generates free radicals or cations to initiate the curing of the polymer after being irradiated by the ultraviolet light, and the curing time is short, so that the problem that the adhesion of the UV ink on the surface of a substrate film is low sometimes occurs. Meanwhile, although the surface tension of the substrate film is improved through corona treatment on the substrate film to achieve the purpose of increasing the wettability of the UV ink, the surface tension of the corona-treated material is poor in stability, the corona effect is gradually weakened along with the time, and particularly under the environment with high humidity, the corona effect is weakened more quickly.
Disclosure of Invention
In order to solve the problem of poor adhesion force when the existing UV ink is printed on the surface of a base material film in the background art, the invention provides a BOPA (biaxially-oriented polyamide) precoating film for enhancing the adhesion force of the UV ink, which comprises a polyamide film layer and a coating layer;
the coating layer is formed by coating the water-based emulsion of the coating layer on the surface of the polyamide film layer, and the components of the water-based emulsion of the coating layer comprise water-based acrylamide copolymer emulsion, a water-based cross-linking agent and water;
the water-based acrylamide copolymer emulsion is obtained by copolymerizing acrylamide, acrylate and itaconic acid; the aqueous cross-linking agent is a trimethylol melamine cross-linking agent.
In addition to the above, preferably, the acrylic ester is 2-ethyl methacrylate, and the water is pure water.
On the basis of the scheme, the mass ratio of the aqueous acrylamide copolymer emulsion to the aqueous cross-linking agent to the water is (9-11) to (0.3-0.5) to (9-11).
On the basis of the scheme, the mass ratio of the acrylamide to the acrylate to the itaconic acid is (3.5-5.5): (3.5-6.5): (1.5-2.5).
On the basis of the scheme, further, the thickness of the coating layer is 0.5-1.0 μm.
In addition to the above, the thickness of the polyamide film layer is 15 μm to 25 μm.
On the basis of the scheme, the polyamide film layer is a biaxially oriented PA film.
On the basis of the scheme, the polyamide film layer is prepared by mixing one or more of nylon 6, a copolymer of nylon 6 and nylon 6, nylon 612, nylon 610, nylon 12, nylon 1212 and poly-m-xylene adipamide.
The invention provides a preparation method of a BOPA (biaxially oriented Polypropylene) precoating film capable of enhancing the adhesive force of UV (ultraviolet) ink, which comprises the following steps:
step a, extruding and casting to obtain a polyamide sheet, and performing biaxial tension and shaping to obtain a biaxial tension polyamide film; finally, carrying out corona treatment on the surface of the polyamide film layer to obtain a polyamide film layer; the corona value of the surface of the polyamide film layer is preferably greater than or equal to 52 dyn/cm;
step b: and (b) coating the water-based emulsion of the coating layer on the corona surface of the BOPA film by using a coating machine and an anilox roller coating mode, drying at the temperature of 100-120 ℃, preferably 15-30 s, rolling, and finally placing in an oven at the temperature of 40-50 ℃ for curing, preferably 24-72 h, so as to obtain the BOPA precoating film capable of enhancing the adhesive force of the UV ink.
On the basis of the scheme, the preparation method of the aqueous emulsion of the coating layer comprises the following steps: adding the water-based acrylamide copolymer emulsion and water into a reaction vessel for stirring, wherein the stirring speed is preferably 200r/min, and the stirring time is preferably 10-15 min; and adding the aqueous cross-linking agent, and continuously stirring, wherein the stirring speed is preferably 200r/min after the aqueous cross-linking agent is added, the stirring time is preferably 10-15min, and simultaneously, standing for 5-10min after uniform stirring is preferably carried out, so as to finally obtain the aqueous emulsion of the coating layer.
On the basis of the scheme, the corona value of the surface of the biaxially oriented polyamide film subjected to corona treatment in the step a is more than or equal to 52 dyn/cm.
Compared with the prior art, the BOPA precoating film for enhancing the adhesive force of the UV ink and the preparation method thereof provided by the invention have the following technical principles and beneficial effects:
according to the BOPA pre-coating film for enhancing the UV ink adhesive force, through the specific coating layer configuration and the preparation process, the preparation method and the coating process of the coating liquid are simple, and the coating layer has a very obvious effect on enhancing the UV ink adhesive force; the itaconic acid contains unsaturated double bond, has active chemical property, can polymerize with other monomers with different numbers besides self-polymerization to form polymer, and can increase adhesive force of the glue to realize water solubility. Because the aqueous cross-linking agent is a trimethylol melamine cross-linking agent which contains hydroxymethyl and has high reaction activity, the aqueous cross-linking agent is easy to react with acylamino in the aqueous acrylamide copolymer emulsion to form a cross-linking product with a three-dimensional (stereo) polymer network structure, has good elasticity and excellent thermal stability, and simultaneously has the excellent performances of wide pigment range, water resistance, safety, sanitation and the like; therefore, the coating liquid in the prepared BOPA pre-coating film is firmly combined with the polyamide film layer, and the acryloyl groups in the aqueous acrylamide copolymer emulsion in the coating liquid can be subjected to curing reaction with the UV ink containing acrylamide groups, so that the prepared BOPA pre-coating film can effectively enhance the adhesive force of the UV ink.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a BOPA precoating film for enhancing the adhesion of UV ink provided by the invention.
Reference numerals:
10 Polyamide film layer 20 coating layer
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention provides a BOPA precoating film capable of enhancing the adhesion of UV ink, which comprises a polyamide film layer 10 and a coating layer 20;
the coating layer 20 is formed by coating the aqueous emulsion of the coating layer 20 on the surface of the polyamide film layer 10, and the components of the aqueous emulsion of the coating layer 20 comprise aqueous acrylamide copolymer emulsion, aqueous cross-linking agent and water;
the water-based acrylamide copolymer emulsion is obtained by copolymerizing acrylamide, acrylate and itaconic acid; the aqueous cross-linking agent is a trimethylol melamine cross-linking agent.
In specific implementation, the aqueous acrylamide copolymer emulsion can be prepared by the following preparation method: weighing a certain amount of itaconic acid and PEG20000 as a dispersion stabilizer, putting into a polymerization kettle, fully stirring at the stirring speed of 900r/min for 15min, then adding acrylamide aqueous solution and 2-ethyl methacrylate under the stirring state, simultaneously injecting high-purity nitrogen (99.9%) to remove oxygen in the system, ensuring that the whole experiment process is carried out in an anaerobic environment, introducing nitrogen for 30min to deoxidize, and the mixed liquid is milky emulsion in the process; the temperature is controlled below 25 ℃ in the deoxidation process, so that premature polymerization is prevented; and (3) adjusting the temperature after the deoxidation is finished, and adding the initiator azobisisobutyrimidazoline hydrochloride when the temperature reaches 40 ℃ for 6 min. And (3) after the initiator is added, heating the system, keeping the temperature at 45 +/-2 ℃ in the reaction process, keeping the stirring speed at 600r/min to ensure that the reaction system is uniformly dispersed, continuing to polymerize for 8 hours after the internal temperature falls back, stopping heating, cooling, and filtering to obtain the emulsion.
As a preferable scheme, the mass ratio of the acrylamide, the acrylic ester, the itaconic acid and the dispersion stabilizer PEG20000 to the azodiisobutylimidazoline hydrochloride is (3.5-5.5): (3.5-6.5): (1.5-2.5):(4.0-5.0): (0.02-0.03).
Preferably, the mass ratio of the aqueous acrylamide copolymer emulsion to the aqueous cross-linking agent to the water is (9-11): (0.3-0.5): (9-11).
In specific implementation, a large number of experiments show that the coating obtained under the condition of the proportion has good adhesion to the polyamide film and can also improve the adhesion of the UV printing ink. Because the aqueous cross-linking agent is a trimethylolmelamine cross-linking agent, the aqueous cross-linking agent contains hydroxymethyl and has high activity, if the addition amount is too small, the aqueous cross-linking agent cannot fully react with the aqueous acrylamide copolymer to obtain a good network structure, the adhesion force of a coating and a film can be influenced, and the fastness of the UV ink can also be influenced. If the addition amount is too high, the reaction with the water-based acrylamide copolymer can improve the adhesion of the coating and the polyamide film, but the coating is too hard and has no elasticity due to the coating crosslinking, so that the adhesion of the UV ink can be influenced.
Preferably, the coating layer 20 has a thickness of 0.5 μm to 1.0 μm.
Preferably, the thickness of the polyamide film layer 10 is 15 μm to 25 μm.
In specific implementation, the cost performance of the BOPA precoating film for enhancing the UV ink adhesion is high under the conditions that the thickness of the coating layer 20 is 0.5-1.0 μm and the thickness of the polyamide film layer 10 is 15-25 μm by comparing and combining the production cost of the precoating film through multiple experiments.
Preferably, the polyamide film layer 10 is a biaxially oriented PA film.
Preferably, the polyamide film layer 10 is made of one or more of nylon 6, a copolymer of nylon 6 and nylon 6, nylon 612, nylon 610, nylon 12, nylon 1212 and poly-m-xylene adipamide.
The invention also provides a preparation method of the BOPA precoating film for enhancing the UV ink adhesive force, which comprises the following steps:
step a, extruding and casting to obtain a polyamide sheet, and performing biaxial tension and shaping to obtain a biaxial tension polyamide film; finally, carrying out corona treatment on the surface of the polyamide film layer to obtain a polyamide film layer 10;
step b: and (b) coating the water-based emulsion of the coating layer 20 on the corona surface of the BOPA film by the polyamide film layer 10 prepared in the step a in an anilox roller coating mode through a coating machine, drying at the temperature of 100-120 ℃, rolling, and finally placing in an oven at the temperature of 40-50 ℃ for curing to obtain the BOPA precoating film for enhancing the adhesive force of the UV ink.
Preferably, the aqueous emulsion of the coating layer 20 is prepared by: and adding the water-based acrylamide copolymer emulsion and water into a reaction container, stirring, adding the water-based cross-linking agent, and continuously stirring to finally obtain the coating layer.
In the specific implementation, step a, carrying out extrusion casting to obtain a polyamide sheet, and carrying out biaxial tension and shaping to obtain a biaxial tension polyamide film; finally, carrying out corona treatment on the surface of the polyamide film layer to obtain a polyamide film layer 10, wherein the corona value is more than or equal to 52 dyn/cm;
step b: b, coating the water-based emulsion of the coating layer 20 on the corona surface of the BOPA film by using a coating machine and an anilox roller coating mode, drying for 15-30 s at the temperature of 100-120 ℃, rolling, and finally placing in a drying oven at the temperature of 40-50 ℃ for curing to obtain a BOPA precoating film for enhancing the adhesive force of the UV ink;
the preparation method of the aqueous emulsion of the coating layer 20 comprises the following steps: weighing a certain amount of water-based acrylamide copolymer emulsion in a plastic barrel of 200KG, then weighing a certain amount of water, adding the water, stirring by a stirrer at a stirring speed of 200r/min for 10-15min, uniformly stirring, then adding a certain amount of water-based cross-linking agent, stirring by the stirrer at a speed of 200r/min for 10-15min, uniformly stirring, and standing for 5-10min for later use.
As shown in fig. 1, the structural diagram of the BOPA precoat film for enhancing UV ink adhesion is shown.
Preferably, the corona value of the surface of the biaxially oriented polyamide film subjected to corona treatment in the step a is more than or equal to 52 dyn/cm.
The present invention also provides the following embodiments:
example 1
Carrying out extrusion casting to obtain a polyamide sheet, carrying out biaxial tension, carrying out corona treatment on the surface after shaping to obtain a polyamide film layer 10 with the corona value of more than or equal to 52dyn/cm, wherein the proportion of water-based acrylamide copolymer emulsion, water-based cross-linking agent and pure water is as follows: 10:0.3:10, coating the water-based emulsion on the corona surface of the polyamide film layer 10 through a coating machine anilox roller, drying for 20s at the temperature of 110 ℃, rolling, and finally placing the polyamide film layer in a drying oven at the temperature of 45 ℃ for curing for 48h to obtain the BOPA precoating film capable of enhancing the adhesive force of the UV ink.
Wherein, the water-based acrylamide copolymer emulsion is prepared by copolymerizing acrylamide, 2-ethyl methacrylate and itaconic acid by the preparation method;
the aqueous acrylamide copolymer emulsion, the aqueous cross-linking agent and the pure water are weighed according to the proportion, and the aqueous emulsion of the coating layer 20 can be obtained by the preparation method;
the water-based crosslinking agent is a trihydroxy melamine crosslinking agent;
the thickness of the coating layer 20 is 1 μm, and the polyamide film layer 10 is a biaxially oriented PA film with a thickness of 15 μm, wherein nylon 6 is used as the resin.
Example 2
Carrying out extrusion casting to obtain a polyamide sheet, carrying out biaxial tension, carrying out corona treatment on the surface after shaping to obtain a polyamide film layer 10 with the corona value of more than or equal to 52dyn/cm, wherein the proportion of water-based acrylamide copolymer emulsion, water-based cross-linking agent and pure water is as follows: 10:0.4:10, coating the aqueous emulsion on the corona surface of the polyamide film layer 10 through a coating machine anilox roller, drying for 20s at the temperature of 110 ℃, rolling, and finally placing the polyamide film layer in a drying oven at the temperature of 45 ℃ for curing for 48h to obtain the BOPA precoating film capable of enhancing the adhesive force of the UV ink.
Wherein, the water-based acrylamide copolymer emulsion is prepared by copolymerizing acrylamide, 2-ethyl methacrylate and itaconic acid by the preparation method;
the aqueous acrylamide copolymer emulsion, the aqueous cross-linking agent and the pure water are weighed according to the proportion, and the aqueous emulsion of the coating layer 20 can be obtained by the preparation method;
the water-based crosslinking agent is a trihydroxy melamine crosslinking agent;
the thickness of the coating layer 20 is 1 μm, and the polyamide film layer 10 is a biaxially oriented PA film with a thickness of 15 μm, wherein nylon 6 is used as the resin.
Example 3
Carrying out extrusion casting to obtain a polyamide sheet, carrying out biaxial tension, carrying out corona treatment on the surface after shaping to obtain a polyamide film layer 10 with the corona value of more than or equal to 52dyn/cm, wherein the proportion of water-based acrylamide copolymer emulsion, water-based cross-linking agent and pure water is as follows: 10:0.5:10 to obtain aqueous emulsion, coating the aqueous emulsion on the corona surface of the polyamide film layer 10 through a coating machine anilox roller, drying for 20s at the temperature of 110 ℃, rolling, and finally placing the polyamide film layer in a drying oven at the temperature of 45 ℃ for curing for 48h to obtain the BOPA precoating film for enhancing the adhesive force of the UV ink.
Wherein, the water-based acrylamide copolymer emulsion is prepared by copolymerizing acrylamide, 2-ethyl methacrylate and itaconic acid by the preparation method;
the aqueous acrylamide copolymer emulsion, the aqueous cross-linking agent and the pure water are weighed according to the proportion, and the aqueous emulsion of the coating layer 20 can be obtained by the preparation method;
the water-based crosslinking agent is a trihydroxy melamine crosslinking agent; (ii) a
The thickness of the coating layer 20 is 1 μm, and the polyamide film layer 10 is a biaxially oriented PA film with a thickness of 15 μm, wherein nylon 6 is used as the resin.
Comparative example 1
Carrying out extrusion casting to obtain a polyamide sheet, carrying out biaxial tension, carrying out corona treatment on the surface after shaping to obtain a polyamide film layer 10 with the corona value of more than or equal to 52dyn/cm, wherein the proportion of water-based acrylamide copolymer emulsion, water-based cross-linking agent and pure water is as follows: 10:0.2:10, coating the water-based emulsion on the corona surface of the polyamide film layer 10 through a coating machine anilox roller, drying for 20s at the temperature of 110 ℃, rolling, and finally placing the polyamide film layer in a drying oven at the temperature of 45 ℃ for curing for 48h to obtain the BOPA precoating film capable of enhancing the adhesive force of the UV ink.
Wherein, the water-based acrylamide copolymer emulsion is prepared by copolymerizing acrylamide, 2-ethyl methacrylate and itaconic acid by the preparation method;
the aqueous acrylamide copolymer emulsion, the aqueous cross-linking agent and the pure water are weighed according to the proportion, and the aqueous emulsion of the coating layer 20 can be obtained by the preparation method;
the water-based crosslinking agent is a trihydroxy melamine crosslinking agent;
the thickness of the coating layer 20 is 1 μm, and the polyamide film layer 10 is a 15 μm biaxially oriented PA film in which nylon 6 is used as the resin.
Comparative example 2
Carrying out extrusion casting to obtain a polyamide sheet, carrying out biaxial tension, carrying out corona treatment on the surface after shaping to obtain a polyamide film layer 10 with the corona value of more than or equal to 52dyn/cm, wherein the proportion of water-based acrylamide copolymer emulsion, water-based cross-linking agent and pure water is as follows: 10:0.6:10, coating the aqueous emulsion on the corona surface of the polyamide film layer 10 through a coating machine anilox roller, drying for 20s at the temperature of 110 ℃, rolling, and finally placing the polyamide film layer in a drying oven at the temperature of 45 ℃ for curing for 48h to obtain the BOPA precoating film capable of enhancing the adhesive force of the UV ink.
Wherein, the water-based acrylamide copolymer emulsion is prepared by copolymerizing acrylamide, 2-ethyl methacrylate and itaconic acid by the preparation method;
the aqueous acrylamide copolymer emulsion, the aqueous cross-linking agent and the pure water are weighed according to the proportion, and the aqueous emulsion of the coating layer 20 can be obtained by the preparation method;
the water-based crosslinking agent is a trihydroxy melamine crosslinking agent;
the thickness of the coating layer 20 is 1 μm, and the polyamide film layer 10 is a biaxially oriented PA film with a thickness of 15 μm, wherein nylon 6 is used as the resin.
Comparative example 3
Carrying out extrusion casting to obtain a polyamide sheet, carrying out biaxial tension, carrying out corona treatment on the surface after shaping to obtain a polyamide film layer 10 with the corona value of more than or equal to 52dyn/cm, wherein the proportion of water-based acrylamide copolymer emulsion, water-based cross-linking agent and pure water is as follows: 10:0.4:10, coating the aqueous emulsion on the corona surface of the polyamide film layer 10 through a coating machine anilox roller, drying for 20s at the temperature of 110 ℃, rolling, and finally placing the polyamide film layer in a drying oven at the temperature of 45 ℃ for curing for 48h to obtain the BOPA precoating film capable of enhancing the adhesive force of the UV ink.
Wherein, the water-based acrylamide copolymer emulsion is prepared by copolymerizing acrylamide, 2-ethyl methacrylate and itaconic acid by the preparation method;
the aqueous acrylamide copolymer emulsion, the aqueous cross-linking agent and the pure water are weighed according to the proportion, and the aqueous emulsion of the coating layer 20 can be obtained by the preparation method;
the water-based cross-linking agent adopts the existing water-based polyisocyanate curing agent;
the thickness of the coating layer 20 is 1 μm, and the polyamide film layer 10 is a biaxially oriented PA film with a thickness of 15 μm, wherein nylon 6 is used as the resin.
Comparative example 4
Carrying out extrusion casting to obtain a polyamide sheet, carrying out biaxial tension, carrying out corona treatment on the surface after shaping to obtain a polyamide film layer 10 with the corona value of more than or equal to 52dyn/cm, wherein the proportion of water-based acrylamide copolymer emulsion, water-based cross-linking agent and pure water is as follows: 10:0.4:10, coating the aqueous emulsion on the corona surface of the polyamide film layer 10 through a coating machine anilox roller, drying for 20s at the temperature of 110 ℃, rolling, and finally placing the polyamide film layer in a drying oven at the temperature of 45 ℃ for curing for 48h to obtain the BOPA precoating film capable of enhancing the adhesive force of the UV ink.
Wherein, the water-based acrylamide copolymer emulsion is prepared by copolymerizing acrylamide and 2-ethyl methacrylate by the preparation method;
the aqueous acrylamide copolymer emulsion, the aqueous cross-linking agent and the pure water are weighed according to the proportion, and the aqueous emulsion of the coating layer 20 can be obtained by the preparation method;
the aqueous cross-linking agent adopts a trihydroxy melamine cross-linking agent;
the thickness of the coating layer 20 is 1 μm, and the polyamide film layer 10 is a biaxially oriented PA film with a thickness of 15 μm, wherein nylon 6 is used as the resin.
Comparative example 5
Carrying out extrusion casting to obtain a polyamide sheet, carrying out biaxial tension, carrying out corona treatment on the surface after shaping, and obtaining the polyamide film layer 10 with the corona value being more than or equal to 52 dyn/cm.
Wherein, the polyamide film layer 10 is a 15 μm thick biaxially oriented PA film, wherein nylon 6 is used as the resin.
The polyamide films obtained in the above examples and comparative examples were printed with UV ink, and UV ink in an amount of 0.2cc was applied to the polyamide film by a dropper, coated with No. 2 bar, and cured with 100% output from a 385nm UV-LED lamp at a speed of 40m/min to obtain a UV ink layer.
The polyamide films with the UV ink layers printed on the above examples and comparative examples were subjected to a tape adhesion test: A3M adhesive tape having a length of 15 to 20cm and a width of 0.5 to 1.0inch was applied to the UV ink layer of the polyamide film on which the UV ink layer was printed and flattened, and then the adhesive tape was peeled off at a uniform speed, and the residual rate of the UV ink was observed and estimated.
The polyamide films printed with the UV ink layers of the above examples and comparative examples were subjected to composite CPP, and peel strength was measured: the polyamide film printed with the UV ink layer is compounded with the CPP film by using double-component polyurethane composite glue, and the composite gluing amount is 3.0g/m2And then curing for 72 hours in a 45 ℃ oven to obtain the BOPA/UV ink/CPP composite film. And then carrying out 180-degree composite film peel strength test, observing the peel strength and observing the residual rate of the UV ink on the BOPA precoating film.
The test results are shown in table 1:
TABLE 1 Performance test Table for examples and comparative examples
As can be seen from the above data, the UV inks of examples 1-3 have better adhesion than those of comparative examples 1-3. In contrast, in comparative example 1, although the aqueous crosslinking agent was added, the amount of the aqueous crosslinking agent was small, which not only reduced the adhesion of the coating to the polyamide film, but also reduced the adhesion of the UV ink; the water-based cross-linking agent is also added in the comparative example 2, but the dosage is higher, although the fastness of the coating and the polyamide film can be improved, the coating is harder, the adhesion of the UV ink is not facilitated, and the adhesion of the UV ink is reduced; comparative example 3 using a common aqueous crosslinking agent, although the residual rate of the UV ink was 50%, it was lower than that of the UV ink to which a trimethylolmelamine crosslinking agent was added; and the adhesion is poorer than that of the embodiment added with the trimethylol melamine crosslinking agent; in comparative example 4, although itaconic acid was not added, the residual force and adhesion of the UV ink were improved to some extent, but the effect was not better than that of itaconic acid. Comparative example 5 is a polyamide film printed with UV ink glue directly by corona, so that UV instant curing causes poor wetting of the BOPA film surface, resulting in a deviation of adhesion.
Although terms such as polyamide film layer, coating layer, etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a reinforcing UV printing ink adhesive force BOPA membrane of precoating which characterized in that: comprising a polyamide film layer (10) and a coating layer (20);
the coating layer (20) is formed by coating an aqueous emulsion of the coating layer (20) on the surface of the polyamide film layer (10), and the components of the aqueous emulsion of the coating layer (20) comprise an aqueous acrylamide copolymer emulsion, an aqueous cross-linking agent and water;
the water-based acrylamide copolymer emulsion is obtained by copolymerizing acrylamide, acrylate and itaconic acid; the aqueous cross-linking agent is a trimethylol melamine cross-linking agent.
2. The UV ink adhesion enhancing BOPA pre-coating film of claim 1, wherein: the mass ratio of the water-based acrylamide copolymer emulsion to the water-based cross-linking agent to the water is (9-11) to (0.3-0.5) to (9-11).
3. The UV ink adhesion enhancing BOPA pre-coating film of claim 1, wherein: the mass ratio of the acrylamide to the acrylate to the itaconic acid is (3.5-5.5): (3.5-6.5): (1.5-2.5).
4. The UV ink adhesion enhancing BOPA pre-coating film of claim 1, wherein: the coating layer (20) has a thickness of 0.5 μm to 1.0 μm.
5. The UV ink adhesion enhancing BOPA pre-coating film of claim 1, wherein: the thickness of the polyamide film layer (10) is 15-25 mu m.
6. The UV ink adhesion enhancing BOPA pre-coating film of claim 1, wherein: the polyamide film layer (10) is a biaxially oriented PA film.
7. The UV ink adhesion enhancing BOPA pre-coating film of claim 1, wherein: the polyamide film layer (10) is prepared by mixing one or more of nylon 6, copolymer of nylon 6 and nylon 6, nylon 612, nylon 610, nylon 12, nylon 1212 and poly-m-xylene adipamide.
8. A method for preparing the BOPA precoat film for enhancing the UV ink adhesion according to any one of claims 1 to 7, which is characterized by comprising the following steps:
step a, extruding and casting to obtain a polyamide sheet, and performing biaxial tension and shaping to obtain a biaxial tension polyamide film; finally, carrying out corona treatment on the surface of the polyamide film layer to obtain a polyamide film layer;
step b: and (b) coating the water-based emulsion of the coating layer on the corona surface of the BOPA film by using a coating machine and an anilox roller coating mode, drying at the temperature of 100-120 ℃, rolling, and finally placing in a drying oven at the temperature of 40-50 ℃ for curing to obtain the BOPA precoating film for enhancing the adhesive force of the UV ink.
9. The method for preparing the BOPA precoat film capable of enhancing the UV ink adhesion according to claim 8, wherein the aqueous emulsion of the coating layer is prepared by: and adding the aqueous acrylamide copolymer emulsion and water into a reaction container, stirring, adding the aqueous cross-linking agent, and continuously stirring to finally obtain the aqueous emulsion of the coating layer.
10. The method for preparing the BOPA precoating film with the enhanced UV ink adhesion force according to claim 8, is characterized in that: the corona value of the surface of the biaxially oriented polyamide film subjected to corona treatment in the step a is more than or equal to 52 dyn/cm.
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| CN112622358A (en) * | 2020-12-23 | 2021-04-09 | 王飞 | Transparent writing quick-drying page film and preparation method thereof |
| CN113912897B (en) * | 2021-10-29 | 2023-03-17 | 昆山运城塑业有限公司 | BOPA composite film with guanidine-modified surface and preparation method thereof |
| CN114230834B (en) * | 2021-11-01 | 2023-03-03 | 昆山运城塑业有限公司 | BOPA film with high printing firmness and preparation method thereof |
| CN117683456A (en) * | 2023-12-21 | 2024-03-12 | 苏州奥美材料科技有限公司 | Primer composition for bio-based nylon substrate and preparation method and application thereof |
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