CN113602021A - Printing film and preparation method thereof - Google Patents
Printing film and preparation method thereof Download PDFInfo
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- CN113602021A CN113602021A CN202110889660.XA CN202110889660A CN113602021A CN 113602021 A CN113602021 A CN 113602021A CN 202110889660 A CN202110889660 A CN 202110889660A CN 113602021 A CN113602021 A CN 113602021A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
- B41M5/03—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by pressure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- 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
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/04—Homopolymers or copolymers of ethene
- C09J123/08—Copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/02—Cellulose; Modified cellulose
- C08J2401/04—Oxycellulose; Hydrocellulose
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention provides a printing film which sequentially comprises a protective layer, a modification layer, an ink image-text layer and an adhesive layer from top to bottom; the protective layer comprises the following components in parts by weight: 60-80 parts of polyethylene, 3-6 parts of silica sol, 1-2 parts of polydimethylsiloxane, 0.5-1.5 parts of nano cellulose crystal (plant) and 0.3-0.8 part of ultraviolet absorbent; the modified layer comprises the following components in parts by weight: 30-50 parts of polypropylene, 1-3 parts of maleic anhydride, 2-4 parts of polyurethane, 1-3 parts of p-hydroxybenzoate, 0.6-1.2 parts of epoxidized soybean oil and 0.5-1 part of nano titanium dioxide; the printing ink image-text layer is printed with pre-designed decorative image-text printing ink; the adhesive is 30-40 parts of ethylene-vinyl acetate emulsion, 3-7 parts of rosin resin, 2-5 parts of ethyl acrylate, 2-5 parts of montmorillonite powder and 1-3 parts of sodium dodecyl sulfate. The printing film has the advantages of good environmental protection, high definition of printing patterns, and good water resistance, weather resistance, toughness, strength, aging resistance and the like.
Description
Technical Field
The invention relates to the technical field of thin film material preparation, in particular to a printing film and a preparation method thereof.
Background
The conventional thermal transfer printing film generally comprises a carrier film, an image-text decorative layer and an adhesive layer, wherein the image-text decorative layer is separated from the carrier film and transferred to the surface of a printing stock under the action of heat and pressure during transfer by using the adhesive force of the adhesive layer. At present, the commonly used printing plastic film mainly comprises polyvinyl chloride (PVC), Polyester (PET), Polystyrene (PS), polypropylene (PP), Polyethylene (PE) and the like, wherein the polyvinyl chloride (PVC) material has good light resistance, aging resistance and tearing resistance, but is not environment-friendly, and is easy to cause pollution when being used in large quantity; polyester (PET) materials are soft, high in strength, resistant to acid, alkali, grease and solvent, resistant to high and low temperatures, limited in use and high in manufacturing cost; polystyrene (PS) materials are soft, tough, colorless, transparent, but poor in solvent and oxidation resistance; the polypropylene (PP) material is resistant to heat, acid and alkali, solvent, friction and tearing, can ventilate, but has small polarity, poor bonding force with ink and difficult printing; polyethylene (PE) materials are non-toxic, have low water absorption, are corrosion resistant, but have poor adhesion to inks.
The current printing film on the market is not environment-friendly, has weak water vapor barrier property, is easy to scratch, age and fade, and has short service life. Meanwhile, the degree of combination of the printing film and the printing ink is not good enough in the preparation process, and the ink is often dropped in the use process of the product, so that the market competitiveness of the product is seriously influenced.
Disclosure of Invention
The invention aims to provide a novel printing film and a preparation method thereof aiming at the defects of the printing film in the prior art, the novel printing film is prepared by taking polyethylene as a main material to prepare a protective layer, taking polypropylene as a main material to prepare a modified layer, taking ethylene-vinyl acetate emulsion and other components to prepare an adhesive, and further adopting four-layer composite co-extrusion, cooling crystallization, bidirectional stretching and the like.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a printing film comprises a protective layer, a modification layer, an ink image-text layer and an adhesive layer from top to bottom in sequence; the protective layer comprises the following components in parts by weight: 60-80 parts of polyethylene, 3-6 parts of silica sol, 1-2 parts of polydimethylsiloxane, 0.5-1.5 parts of nano cellulose crystal and 0.3-0.8 part of ultraviolet absorbent; the modified layer comprises the following components in parts by weight: 30-50 parts of polypropylene, 1-3 parts of maleic anhydride, 2-4 parts of polyurethane, 1-3 parts of p-hydroxybenzoate, 0.6-1.2 parts of epoxidized soybean oil and 0.5-1 part of nano titanium dioxide; the printing ink image-text layer is printed with pre-designed decorative image-text printing ink; the adhesive is 30-40 parts of ethylene-vinyl acetate emulsion, 3-7 parts of rosin resin, 2-5 parts of ethyl acrylate, 2-5 parts of montmorillonite powder and 1-3 parts of sodium dodecyl sulfate.
Furthermore, the thickness ratio of the protective layer, the modification layer, the ink image-text layer and the adhesive layer is 3-5:2:1: 1.5.
Further, the thickness of the printing film is 0.05-0.5 mm.
The preparation method of the printing film comprises the following steps:
s1: according to the weight portion, 60-80 portions of polyethylene, 3-6 portions of silica sol and 0.5-1.5 portions of nano cellulose crystal are added into a reaction kettle and stirred and reacted for 1-3 hours at the temperature of 120-; then cooling to the temperature, adding 1-2 parts of polydimethylsiloxane and 0.3-0.8 part of ultraviolet absorbent, and continuing to react for 30-50min to obtain a protective layer material;
s2: according to the parts by weight, adding 30-50 parts of polypropylene, 1-3 parts of maleic anhydride, 2-4 parts of polyurethane and 1-3 parts of p-hydroxybenzoate into a reaction kettle, and stirring and reacting at the temperature of 140-; then adding 0.5-1 part of nano titanium dioxide and 0.6-1.2 parts of epoxidized soybean oil, and continuing to react for 20-50min to obtain a modified layer material;
s3: adding 30-40 parts of ethylene-vinyl acetate emulsion, 3-7 parts of rosin resin, 2-5 parts of ethyl acrylate, 2-5 parts of montmorillonite powder and 1-3 parts of sodium dodecyl sulfate into a reaction kettle, and stirring and reacting at the temperature of 110-;
s4: co-extruding the protective layer material obtained in the step S1, the modified layer material obtained in the step S2, the ink image-text layer material and the adhesive material obtained in the step S3 onto a chill roll through a four-layer composite die head, and cooling and crystallizing to form a thick sheet;
s5: longitudinally stretching and transversely stretching the thick sheet obtained in the step S4 to obtain a formed film; and then, trimming, rolling and slitting the formed film to obtain the finished printed film.
Further, step S1 is specifically: adding 75 parts of polyethylene, 5 parts of silica sol and 1 part of nano cellulose crystal into a reaction kettle, and stirring and reacting at the temperature of 128 ℃ for 2.5 hours; then, the temperature is reduced to 1.5 parts of polydimethylsiloxane and 0.6 part of ultraviolet absorbent, and the reaction is continued for 40 min.
Further, step S2 is specifically: adding 38 parts of polypropylene, 2 parts of maleic anhydride, 3 parts of polyurethane and 2 parts of p-hydroxybenzoate into a reaction kettle, and stirring at 162 ℃ for reaction for 3.5 hours; then 0.7 part of nano titanium dioxide and 1 part of epoxidized soybean oil are added, and the reaction is continued for 40 min.
Further, step S3 is specifically: adding 35 parts of ethylene-vinyl acetate emulsion, 5 parts of rosin resin, 3 parts of ethyl acrylate, 4 parts of montmorillonite powder and 2 parts of sodium dodecyl sulfate into a reaction kettle, and stirring and reacting for 2 hours at 120 ℃.
Further, step S4 is specifically: the four-section temperature setting of the screw part co-extruded by the four-layer composite die head is as follows: 105-110 ℃, 115-120 ℃, 120-125 ℃ and 113-118 ℃; the temperature of the head part bend is 175-185 ℃, and the temperature of the die head is 185-195 ℃.
Has the advantages that:
1. according to the invention, polyethylene, silica sol and nano-cellulose crystals are added in the preparation of the protective layer, and the protective layer has excellent waterproofness and corrosion resistance under the synergistic effect of the polyethylene with small water absorption and corrosion resistance, the silica sol and the nano-cellulose crystals which have large specific surface area and are easy to form a net structure; meanwhile, under the action of the cellulose crystal, the polydimethylsiloxane and the ultraviolet absorbent, the toughness and the strength are greatly improved, the protective layer is not easy to crack, and the aging resistance is good; under the action of the silica sol, the protective layer has antistatic performance without adding an antistatic agent, and dust is not easy to absorb.
2. In the preparation of the modified layer, the modified polypropylene such as maleic anhydride, polyurethane, p-hydroxybenzoate is used, so that the polypropylene surface has polar groups such as hydroxyl, carbonyl, carboxyl and the like, the polarity and the surface energy of the surface of the modified layer are improved, the affinity between the surface of the modified layer used for printing and ink is good, the surface of the modified layer used for printing does not have a weak interface layer and falls off along with the ink, and the printing effect is good; meanwhile, the modified layer also has groups with good compatibility with the protective layer, such as alkyl groups, and the combination is more compact; by adding the nano titanium dioxide and the epoxidized soybean oil, the toughness and the surface roughness of the modified layer are improved, the modified layer and the polar group are cooperatively exerted, and the binding force with the ink is further improved.
3. In the preparation of the adhesive, the ethylene-vinyl acetate emulsion is taken as the main material, and the rosin resin, the ethyl acrylate, the montmorillonite powder and the sodium dodecyl sulfate are added, so that the prepared adhesive has the advantages of high curing speed, stable product quality, no pollution to the environment and high peel strength.
4. According to the invention, the novel printing film is prepared by co-extruding the protective layer material, the modified layer material, the printing ink image-text layer and the adhesive layer material, so that the film integrally has good performances of static electricity prevention, water resistance, corrosion resistance, toughness, tensile strength and the like, and is high in curing speed and good in printing effect.
Detailed Description
The present invention is further illustrated below by reference to the following examples, which are intended to be illustrative of the invention only and are not intended to be limiting.
Example 1
S1: adding 60g of polyethylene, 3g of silica sol and 0.5g of nano-cellulose crystal into a reaction kettle, and stirring and reacting at 120 ℃ for 1 h; then cooling to the temperature, adding 1g of polydimethylsiloxane and 0.3g of ultraviolet absorbent, and continuing to react for 30min to obtain a protective layer material;
s2: adding 30g of polypropylene, 1g of maleic anhydride, 2g of polyurethane and 1g of p-hydroxybenzoate into a reaction kettle, and stirring at 140 ℃ for reaction for 2 hours; then adding 0.5g of nano titanium dioxide and 0.6g of epoxidized soybean oil, and continuing to react for 20min to obtain a modified layer material;
s3: adding 30g of ethylene-vinyl acetate emulsion, 3g of rosin resin, 2g of ethyl acrylate, 2g of montmorillonite powder and 1g of sodium dodecyl sulfate into a reaction kettle, and stirring and reacting at 110 ℃ for 1 hour to obtain an adhesive material;
s4: co-extruding the protective layer material obtained in the step S1, the modification layer material obtained in the step S2, the ink image-text layer material and the adhesive material obtained in the step S3 onto a chill roll through a four-layer composite die head, wherein the four temperature settings of a screw part are respectively as follows: 105 ℃, 115 ℃, 120 ℃ and 113 ℃; the temperature of a nose section bend is 175 ℃, and the temperature of a die head is 185 ℃; cooling and crystallizing to form a thick sheet;
s5: longitudinally stretching and transversely stretching the thick sheet obtained in the step S4 to obtain a formed film; and then, trimming, rolling and slitting the formed film to obtain the finished printed film.
Example 2
S1: adding 80g of polyethylene, 6g of silica sol and 1.5g of nano-cellulose crystal into a reaction kettle, and stirring and reacting at 140 ℃ for 3 hours; then cooling to the temperature, adding 2g of polydimethylsiloxane and 0.8g of ultraviolet absorbent, and continuing to react for 50min to obtain a protective layer material;
s2: adding 50g of polypropylene, 3g of maleic anhydride, 4g of polyurethane and 3g of p-hydroxybenzoate into a reaction kettle, and stirring at the temperature of 170 ℃ for reaction for 5 hours; then adding 1g of nano titanium dioxide and 1.2g of epoxidized soybean oil, and continuing to react for 50min to obtain a modified layer material;
s3: adding 40g of ethylene-vinyl acetate emulsion, 7g of rosin resin, 5g of ethyl acrylate, 5g of montmorillonite powder and 3g of sodium dodecyl sulfate into a reaction kettle, and stirring and reacting at 130 ℃ for 3 hours to obtain an adhesive material;
s4: co-extruding the protective layer material obtained in the step S1, the modification layer material obtained in the step S2, the ink image-text layer material and the adhesive material obtained in the step S3 onto a chill roll through a four-layer composite die head, wherein the four temperature settings of a screw part are respectively as follows: 110 ℃, 120 ℃, 125 ℃ and 118 ℃; the temperature of a nose part bend is 185 ℃ and the temperature of a die head is 195 ℃; cooling and crystallizing to form a thick sheet;
s5: longitudinally stretching and transversely stretching the thick sheet obtained in the step S4 to obtain a formed film; and then, trimming, rolling and slitting the formed film to obtain the finished printed film.
Example 3
S1: adding 75g of polyethylene, 5g of silica sol and 1g of nano-cellulose crystal into a reaction kettle, and stirring and reacting at the temperature of 128 ℃ for 2.5 h; then cooling to the temperature, adding 1.5g of polydimethylsiloxane and 0.6g of ultraviolet absorbent, and continuing to react for 40min to obtain a protective layer material;
s2: adding 38g of polypropylene, 2g of maleic anhydride, 3g of polyurethane and 2g of p-hydroxybenzoate into a reaction kettle, and stirring at 162 ℃ for reaction for 3.5 hours; then adding 0.7g of nano titanium dioxide and 1g of epoxidized soybean oil, and continuing to react for 40min to obtain a modified layer material;
s3: adding 35g of ethylene-vinyl acetate emulsion, 5g of rosin resin, 3g of ethyl acrylate, 4g of montmorillonite powder and 2g of sodium dodecyl sulfate into a reaction kettle, and stirring and reacting at 120 ℃ for 2 hours to obtain an adhesive material;
s4: co-extruding the protective layer material obtained in the step S1, the modification layer material obtained in the step S2, the ink image-text layer material and the adhesive material obtained in the step S3 onto a chill roll through a four-layer composite die head, wherein the four temperature settings of a screw part are respectively as follows: 108 ℃, 117 ℃, 123 ℃ and 115 ℃; the temperature of a nose part bend is 180 ℃, and the temperature of a die head is 191 ℃; cooling and crystallizing to form a thick sheet;
s5: longitudinally stretching and transversely stretching the thick sheet obtained in the step S4 to obtain a formed film; and then, trimming, rolling and slitting the formed film to obtain the finished printed film.
Comparative example 1
The difference from example 1 is that no silica sol was added in step S1, and the other steps and conditions were not changed.
Comparing with comparative example 1 and example 1, it is known that polyethylene, silica sol and nanocellulose crystal three-dimensional network structure are not sufficiently formed in the absence of silica sol, and water resistance, corrosion resistance, antistatic property, etc. of the printed film are remarkably decreased.
Comparative example 2
The difference from example 1 is that no nanocellulose crystals were added in step S1, and the other steps and conditions were unchanged.
Comparing comparative example 2 and example 1, it is known that the absence of nanocellulose crystals makes the silica sol more likely to crack after film formation, and the toughness and strength of the printed film are reduced.
Comparative example 3
The difference from example 1 is that in step S2, no maleic anhydride, polyurethane or paraben is added to modify the surface of polypropylene, and other steps and conditions are not changed.
Comparing with comparative example 3 and example 1, it is known that the polypropylene surface is not modified, and the polarity of the surface is weak, the surface energy is low, so the affinity with the printing ink image-text layer material is poor, the adhesive force is weak, the ink is easy to remove, and the printing effect is not good.
Comparative example 4
The difference from the example 1 is that no nano titanium dioxide is added in the step S2, and other steps and conditions are not changed.
Comparing with comparative example 4 and example 1, it is known that the roughness of the film surface is too low due to the lack of the action of the nano titanium dioxide, which affects the binding degree of the ink and the printing film, and the affinity of the printing film is reduced.
Comparative example 5
The difference from example 1 is that a commercially available ordinary adhesive was directly used in step S3, and other steps and conditions were not changed.
As can be seen from comparison of comparative example 5 and example 1, the printed film produced using the conventional adhesive had weak adhesive force, poor adhesive force and low durability.
The performance test method comprises the following steps:
tensile strength according to GB/T1040.1-2006; elongation at break according to GB 1040.3-2006; tear strength as per GB/T16578.1-2008; the light transmittance is GB/T2410-2008; moisture permeability is tested according to GB T12704; oxygen permeability is according to GPT-301; the stripping force is in accordance with GB/T2792-2014; and (3) evaluating the aging performance: the peel force data was stored at 85-85% RH 21 d.
The above examples and comparative examples were tested and the results are as follows:
the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.
Claims (8)
1. A printing film is characterized by sequentially comprising a protective layer, a modification layer, an ink image-text layer and an adhesive layer from top to bottom; the protective layer comprises the following components in parts by weight: 60-80 parts of polyethylene, 3-6 parts of silica sol, 1-2 parts of polydimethylsiloxane, 0.5-1.5 parts of nano cellulose crystal (plant) and 0.3-0.8 part of ultraviolet absorbent; the modified layer comprises the following components in parts by weight: 30-50 parts of polypropylene, 1-3 parts of maleic anhydride, 2-4 parts of polyurethane, 1-3 parts of p-hydroxybenzoate, 0.6-1.2 parts of epoxidized soybean oil and 0.5-1 part of nano titanium dioxide; the printing ink image-text layer is printed with pre-designed decorative image-text printing ink; the adhesive is 30-40 parts of ethylene-vinyl acetate emulsion, 3-7 parts of rosin resin, 2-5 parts of ethyl acrylate, 2-5 parts of montmorillonite powder and 1-3 parts of sodium dodecyl sulfate.
2. The printing film of claim 1, wherein the thickness ratio of the protective layer, the modifying layer, the ink-text layer and the adhesive layer is 3-5:2:1: 1.5.
3. The printed film of claim 1, wherein the printed film has a thickness of 0.05 to 0.5 mm.
4. A method for preparing a printed film is characterized by comprising the following steps:
s1: according to the weight portion, adding polyethylene, silica sol and nano cellulose crystal into a reaction kettle, and stirring and reacting for 1-3h at the temperature of 120-; then cooling to the temperature, adding polydimethylsiloxane and an ultraviolet absorbent, and continuing to react for 30-50min to obtain a protective layer material;
s2: adding polypropylene, maleic anhydride, polyurethane and p-hydroxybenzoate into a reaction kettle, and stirring at the temperature of 140 ℃ and 170 ℃ for reaction for 2-5 h; then adding nano titanium dioxide and epoxidized soybean oil, and continuing to react for 20-50min to obtain a modified layer material;
s3: adding ethylene-vinyl acetate emulsion, rosin resin, ethyl acrylate, montmorillonite powder and sodium dodecyl sulfate into a reaction kettle, and stirring and reacting at the temperature of 110-;
s4: co-extruding the protective layer material obtained in the step S1, the modified layer material obtained in the step S2, the ink image-text layer material and the adhesive material obtained in the step S3 onto a chill roll through a four-layer composite die head, and cooling and crystallizing to form a thick sheet;
s5: longitudinally stretching and transversely stretching the thick sheet obtained in the step S4 to obtain a formed film; and then, trimming, rolling and slitting the formed film to obtain the finished printed film.
5. A method for producing a printed film according to claim 3, wherein: step S1 specifically includes: adding 75 parts of polyethylene, 5 parts of silica sol and 1 part of nano cellulose crystal into a reaction kettle, and stirring and reacting at the temperature of 128 ℃ for 2.5 hours; then, the temperature is reduced to 1.5 parts of polydimethylsiloxane and 0.6 part of ultraviolet absorbent, and the reaction is continued for 40 min.
6. A method for producing a printed film according to claim 3, wherein: step S2 specifically includes: adding 38 parts of polypropylene, 2 parts of maleic anhydride, 3 parts of polyurethane and 2 parts of p-hydroxybenzoate into a reaction kettle, and stirring at 162 ℃ for reaction for 3.5 hours; then 0.7 part of nano titanium dioxide and 1 part of epoxidized soybean oil are added, and the reaction is continued for 40 min.
7. A method for producing a printed film according to claim 3, wherein: step S3 specifically includes: adding 35 parts of ethylene-vinyl acetate emulsion, 5 parts of rosin resin, 3 parts of ethyl acrylate, 4 parts of montmorillonite powder and 2 parts of sodium dodecyl sulfate into a reaction kettle, and stirring and reacting for 2 hours at 120 ℃.
8. A method for producing a printed film according to claim 3, wherein: step S4 specifically includes: the four-section temperature setting of the screw part co-extruded by the four-layer composite die head is as follows: 105-110 ℃, 115-120 ℃, 120-125 ℃ and 113-118 ℃; the temperature of the head part bend is 175-185 ℃, and the temperature of the die head is 185-195 ℃.
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| CN113602021B (en) | 2023-04-21 |
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