Degradable advertisement inkjet film and preparation method thereof

Abstract

The invention relates to the technical field of advertisement display, decorative materials and environment-friendly materials, in particular to a degradable advertisement inkjet film and a preparation method thereof.The degradable advertisement inkjet film comprises a glittering ink absorption layer, a degradation starting layer and a main body layer arranged between the glittering ink absorption layer and the degradation starting layer; 1%-2% of an ultraviolet light absorber; and the like. According to the degradable advertisement jet drawing film, by means of the three-layer structural design, the perfect combination of the advertisement effect and environment-friendly degradation is achieved, the flash ink absorption layer provides the unique visual effect, meanwhile, the graphene nanosheet modified titanium oxide photocatalytic layer can catalyze the degradation process under illumination, the main body layer guarantees the mechanical and printing performance of the film, and the degradable advertisement jet drawing film has the good application prospect. And the degradation starting layer realizes rapid degradation through a microbial enzyme complex, and particularly, the graphene nanosheet modified titanium oxide photocatalytic layer is used as a key technology, so that the degradation rate of the advertisement film is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of advertising display, decorative materials and environmentally friendly materials, and more specifically to a degradable advertising inkjet film and a preparation method thereof. Background Art

[0002] With the rapid development of the advertising industry, large-format, diversified printing materials, such as inkjet and photo outdoor advertising, have occupied an important position in the market. These forms of advertising are widely used in billboards beside highways, product posters in commercial areas, outdoor personal photos, product advertisements and other fields. However, traditional outdoor advertising materials, such as PET, PP or base fabrics, are printed after the ink absorbing material is coated on the surface. Although they can meet the basic advertising needs, their service life is limited, and they need to be replaced frequently due to the market and company operations, resulting in a large number of white pollution problems; In order to meet this challenge, the development of environmentally friendly and degradable inkjet materials has become an important research direction in the current field of advertising display and decorative material technology. Although there are many degradable polyester films on the market, there are relatively few degradable polyester films suitable for inkjet printing materials. These materials need to have good degradation properties to reduce pollution to the environment. At the same time, they also need to meet the high requirements of inkjet printing, such as bright colors, clear patterns, good weather resistance, etc. Therefore, it is urgent to develop a degradable advertising inkjet film and its preparation method that integrates high degradation rate, excellent inkjet performance and environmental protection. Summary of the invention

[0003] In view of the widespread environmental pollution problems and technical difficulties of insufficient printing performance of existing advertising inkjet materials, the present invention aims to provide a degradable advertising inkjet film integrating high degradation rate, excellent printing performance and environmental protection and a preparation method thereof.

[0004] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: The present invention provides a degradable advertising inkjet film and a preparation method thereof, comprising a flashing ink-absorbing layer, a degradation start layer and a main body layer arranged between the flashing ink-absorbing layer and the degradation start layer: The flashing ink-absorbing layer has the following composition percentages: Glitter additive: 1%-3%; UV absorber: 1%-2%; Graphene nanosheets modified titanium oxide photocatalytic layer: 0.5%-1%; Ink absorbent: 2%-4%; Additives: 0.5%-1%; Polymer matrix: 88.5%-93.5%; The main layer, its component percentages are: Polymer matrix: 55%-65%; Nanocellulose enhancer: 1%-3%; Polymer-based cross-linking agent: 3%-5%; Pigment or dye: 2%-4%; Additives: 0%-2%; Degradation initiation layer, the percentage of its components is: Microbial enzyme complex: 0.3%-0.7%; Enzyme stabilizer: 0.1%-0.3%; Polymer matrix: 99.0%-99.6%.

[0005] As a preferred technical solution of the present invention, the polymer matrix is ​​selected from a block copolymer of polylactic acid and polyhydroxyalkanoate, polylactic acid, polyhydroxyalkanoate or polycaprolactone.

[0006] As a preferred technical solution of the present invention, the microbial enzyme complex comprises the following components in percentage: 20%-30% lipase, 30%-40% protease and 40%-50% cellulase.

[0007] As a preferred technical solution of the present invention, the glitter additive is selected from one or more of mica flakes, glass beads, aluminum powder or silver powder, and its particle size range is between 1-10 microns.

[0008] As a preferred technical solution of the present invention, the ultraviolet absorber is a benzotriazole compound, and the ink absorber is a porous silicon-based material or nanocellulose.

[0009] As a preferred technical solution of the present invention, the additives in the flashing ink-absorbing layer include antioxidants and anti-ultraviolet aging agents, which are mixed with other components when preparing the flashing ink-absorbing layer; the additives in the main layer include leveling agents and defoaming agents, which are mixed with other components when preparing the main layer.

[0010] As a preferred technical solution of the present invention, the enzyme stabilizer is selected from one of trehalose and mannitol.

[0011] As a preferred technical solution of the present invention, the graphene nanosheet-modified titanium oxide photocatalytic layer is prepared by the following steps: mixing the graphene nanosheets with the titanium oxide precursor solution, under normal pressure and inert atmosphere, ultrasonically dispersing for 30-60 minutes, hydrothermally reacting at 150-200°C for 4-8 hours, and then heat treating at 300-400°C for 1-2 hours to obtain a catalytic layer.

[0012] The present invention also provides a method for preparing a degradable advertising inkjet film, comprising the following steps: S1: Prepare the raw materials required for each layer and ensure that their purity and specifications meet the predetermined requirements; S2: According to the component percentages of the degradable advertising inkjet film described in any one of the above items, accurately weigh and evenly mix the raw materials of each layer, and perform pre-dispersion or pre-reaction if necessary; S3: Using coating, co-extrusion or lamination film-forming process, first forming a degradation initiation layer, then forming a main layer thereon, and finally forming a flash ink-absorbing layer on the main layer, thereby obtaining a composite film, and controlling the thickness and uniformity of each layer; S4: heat treating the composite film to solidify the coating, then cooling it to room temperature, and performing surface treatment as needed to ensure the stability and performance of the film layer; S5: Carry out quality inspection on finished products. Inspection items include appearance inspection, physical property test and degradation performance test to ensure that the products meet the design requirements.

[0013] The beneficial effects of the present invention are as follows: The degradable advertising inkjet film of the present invention achieves a perfect combination of advertising effect and environmental degradation by virtue of its three-layer structural design. The flashing ink-absorbing layer provides a unique visual effect, while its graphene nanosheet-modified titanium oxide photocatalytic layer can catalyze the degradation process under light. The main layer ensures the mechanical and printing properties of the film, while the degradation initiation layer achieves rapid degradation through a microbial enzyme complex. In particular, the graphene nanosheet-modified titanium oxide photocatalytic layer, as a key technology, significantly improves the degradation rate of the advertising film. In general, this advertising film not only has outstanding visual effects, but more importantly, its environmentally friendly degradation characteristics are expected to greatly reduce the environmental pollution caused by traditional advertising films, meeting the current social needs for green environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the present invention; DETAILED DESCRIPTION

[0015] like Figure 1 As shown, the present invention proposes: a degradable advertising inkjet film and a preparation method thereof, comprising a flashing ink-absorbing layer, a degradation start layer and a main body layer arranged between the flashing ink-absorbing layer and the degradation start layer: The flashing ink-absorbing layer has the following composition percentages: Glitter additive: 1%-3%; UV absorber: 1%-2%; Graphene nanosheets modified titanium oxide photocatalytic layer: 0.5%-1%; Ink absorbent: 2%-4%; Additives: 0.5%-1%; Polymer matrix: 88.5%-93.5%; The main layer, its component percentages are: Polymer matrix: 55%-65%; Nanocellulose enhancer: 1%-3%; Polymer-based cross-linking agent: 3%-5%; Pigment or dye: 2%-4%; Additives: 0%-2%; Degradation initiation layer, the percentage of its components is: Microbial enzyme complex: 0.3%-0.7%; Enzyme stabilizer: 0.1%-0.3%; Polymer matrix: 99.0%-99.6%.

[0016] Wherein, the polymer matrix is ​​selected from a block copolymer of polylactic acid and polyhydroxyalkanoate, polylactic acid, polyhydroxyalkanoate or polycaprolactone.

[0017] The microbial enzyme complex comprises the following components in percentage: 20%-30% lipase, 30%-40% protease and 40%-50% cellulase.

[0018] The glitter additive is selected from one or more of mica flakes, glass beads, aluminum powder or silver powder, and its particle size range is between 1-10 microns.

[0019] Wherein, the ultraviolet absorber is a benzotriazole compound, and the ink absorber is a porous silicon-based material or nanocellulose.

[0020] The additives in the flashing ink-absorbing layer include antioxidants and anti-ultraviolet aging agents, which are mixed with other components when preparing the flashing ink-absorbing layer; the additives in the main layer include leveling agents and defoaming agents, which are mixed with other components when preparing the main layer.

[0021] Wherein, the enzyme stabilizer is selected from one of trehalose and mannitol.

[0022] The graphene nanosheet-modified titanium oxide photocatalytic layer is prepared by the following steps: mixing the graphene nanosheets with the titanium oxide precursor solution, ultrasonically dispersing for 30-60 minutes under normal pressure and inert atmosphere, hydrothermally reacting at 150-200°C for 4-8 hours, and then heat treating at 300-400°C for 1-2 hours to obtain a catalytic layer.

[0023] The present invention also provides a method for preparing a degradable advertising inkjet film, comprising the following steps: S1: Prepare the raw materials required for each layer and ensure that their purity and specifications meet the predetermined requirements; S2: According to the component percentages of the degradable advertising inkjet film described in any one of the above items, accurately weigh and evenly mix the raw materials of each layer, and perform pre-dispersion or pre-reaction if necessary; S3: Using coating, co-extrusion or lamination film-forming process, first forming a degradation initiation layer, then forming a main layer thereon, and finally forming a flash ink-absorbing layer on the main layer, thereby obtaining a composite film, and controlling the thickness and uniformity of each layer; S4: heat treating the composite film to solidify the coating, then cooling it to room temperature, and performing surface treatment as needed to ensure the stability and performance of the film layer; S5: Carry out quality inspection on finished products. Inspection items include appearance inspection, physical property test and degradation performance test to ensure that the products meet the design requirements.

[0024] The degradable advertising inkjet film of the present invention achieves multiple goals of efficient ink absorption, excellent printing effect, environmentally friendly degradation and long-term weather resistance of the advertising inkjet film through ingenious structural design and material selection.

[0025] As the outermost layer of the inkjet film, the flash ink-absorbing layer directly determines the printing effect and ink absorption performance. Among them, the addition of flash additives such as mica flakes and glass beads not only gives the film a unique flash effect and enhances the visual appeal of the advertisement, but also controls its particle size between 1-10 microns, ensuring the uniform distribution of the additives and the smoothness of the film. The addition of ultraviolet absorbers effectively prevents ultraviolet rays from damaging the film and printed patterns, ensuring the durability of the printing effect. In particular, benzotriazole compounds are selected as ultraviolet absorbers, and their excellent ultraviolet absorption capacity and stability provide long-term protection for the inkjet film.

[0026] The introduction of the titanium oxide photocatalytic layer modified by graphene nanosheets is a major innovation of the present invention. This layer combines the excellent conductivity of graphene and the photocatalytic performance of titanium oxide, and through a specific preparation process, forms a composite layer with efficient photocatalytic activity. Under light irradiation, this layer can effectively decompose organic pollutants, thereby maintaining the self-cleaning function of the film layer and extending its service life. At the same time, the addition of graphene also enhances the conductivity of the film layer, helps prevent static electricity accumulation, and improves stability and image quality during printing.

[0027] The main layer, as the structural support layer of the inkjet printing film, adopts a high polymer matrix and adds nanocellulose reinforcing agent and polymer-based cross-linking agent to improve the mechanical strength and weather resistance of the film. The addition of pigments or dyes enriches the color expression of the film layer and meets the diverse needs of advertising inkjet printing.

[0028] The degradation initiation layer, located in the innermost layer, is the key to the environmentally friendly degradation of the present invention. By adding a specific proportion of microbial enzyme complex, this layer can trigger the biodegradation process of the film layer under certain conditions, thereby achieving environmentally friendly treatment of the inkjet film. The addition of enzyme stabilizers ensures the activity and stability of the microbial enzymes and ensures the controllability of the degradation process.

[0029] In terms of preparation method, the present invention adopts coating, co-extrusion or lamination film-forming processes, which are efficient and environmentally friendly and suitable for large-scale industrial production. The high quality and stability of the inkjet film are ensured by accurately controlling the thickness and uniformity of each layer, as well as the subsequent heat treatment and surface treatment process.

[0030] The graphene nanosheet-modified titanium oxide photocatalytic layer is one of the core innovations of the present invention. This layer combines the excellent properties of graphene and titanium oxide and achieves efficient photocatalytic activity through a specific preparation process.

[0031] In the preparation process, the graphene nanosheets are first mixed with the titanium oxide precursor solution, and then subjected to ultrasonic dispersion, hydrothermal reaction and heat treatment to finally obtain the catalyst layer. Among them, ultrasonic dispersion ensures the uniform distribution of graphene nanosheets in the solution; the hydrothermal reaction promotes the close bonding between graphene and titanium oxide under high temperature and high pressure; and the final heat treatment process further improves the crystallinity and photocatalytic activity of the catalyst layer.

[0032] This modified titanium oxide photocatalytic layer can efficiently decompose organic pollutants under light irradiation and maintain the self-cleaning function of the film. At the same time, the excellent conductivity of graphene also helps to prevent static electricity accumulation, improve the stability of the printing process and image quality. The introduction of this composite layer not only improves the performance of the inkjet film, but also gives it a longer service life and a wider range of application scenarios.

[0033] Example 1: Layers of different polymer matrices Material composition: Glitter Ink-Absorbing Layer: Polylactic acid (PLA) was used as the matrix.

[0034] 1.5% of mica flakes (particle size 5 microns) are added to enhance the sparkle effect.

[0035] 1.5% of benzotriazole UV absorber, containing 20% ​​active ingredients, is added to improve UV resistance.

[0036] 0.75% of graphene nanosheet-modified titanium oxide was mixed in as a photocatalytic layer to promote degradation.

[0037] 3.5% of porous silicon-based material is added as an ink absorbent to enhance ink absorption.

[0038] Contains 0.75% of other additives such as antioxidants and UV ageing agents to improve material stability.

[0039] Main layer: Polyhydroxyalkanoate (PHA) was used as the matrix.

[0040] 60% nanocellulose reinforcement is mixed in to improve the material strength.

[0041] 4% of polymer-based cross-linking agent was added to enhance structural stability.

[0042] 3% blue pigment (pigment content 50%) was added to provide color.

[0043] Contains 1% leveling agent and defoamer to improve coating surface quality.

[0044] Degradation start layer: Polycaprolactone (PCL) was used as the matrix.

[0045] 0.5% of a microbial enzyme complex, containing 20% ​​lipase, 30% protease, and 50% cellulase, was added to initiate the biodegradation process.

[0046] 0.2% trehalose was added as an enzyme stabilizer to maintain enzyme activity.

[0047] Preparation steps: Preparation: Ensure that all raw materials meet required purity and specifications.

[0048] Weighing: Accurately weigh the raw materials required for each layer in proportion and perform pre-dispersion or pre-reaction.

[0049] Coating: First, apply the PCL layer to form the degradation initiation layer, then apply the PHA layer to form the main layer, and finally apply the PLA layer to form the flash ink-absorbing layer, and strictly control the thickness of each layer.

[0050] Curing: Heat treatment curing, followed by cooling to room temperature and surface treatment.

[0051] Inspection: Quality inspection is carried out after preparation, including appearance inspection, physical property test and degradation performance test.

[0052] Experimental data: Glitter Ink-Absorbing Layer: Ink absorption efficiency: 98% - UV Protection Index (UPF): 50+ Photocatalytic degradation rate: 2.5% degradation per day Main layer: Tensile strength: 25 MPa Weather resistance: no noticeable fading within 8000 hours Degradation start time: Degradation starts after 120 days in a specific biodegradation environment Degradation start layer: Microbial enzyme complex activity retention rate: 90% activity after 60 days Degradation rate: 30% within 365 days Example 2: Layers of the same polymer matrix (polylactic acid, PLA) Materials and preparation steps: Similar to Example 1, but all layers use PLA as the matrix and the ratio of additives is adjusted.

[0053] Experimental data: Glitter Ink-Absorbing Layer: Ink absorption efficiency: 96% UPF: 45+ Photocatalytic degradation rate: 2% degradation per day Main layer: Tensile strength: 23 MPa Weather resistance: no noticeable fading within 7000 hours Degradation start time: 140 days Degradation start layer: Microbial enzyme complex activity retention rate: 85% Degradation rate: 25% within 365 days Example 3: Arbitrarily selected polymer matrix Materials and preparation steps: The flashing ink-absorbing layer uses polyurethane (PU), the main layer uses polycarbonate (PC), the degradation initiation layer uses polyester (PET), and corresponding additives are added. The preparation steps are the same as those in Example 1.

[0054] Experimental data: Glitter Ink-Absorbing Layer: Ink absorption efficiency: 97% UPF: 48+ Photocatalytic degradation rate: 2.2% degradation per day Main layer: Tensile strength: 27 MPa Weather resistance: no noticeable fading within 9000 hours Degradation start time: 110 days Degradation start layer: Microbial enzyme complex activity retention rate: 92% Degradation rate: 35% in 365 days By comparing the experimental data of these three embodiments, it can be found that the selection of different polymer matrices has a significant effect on the performance of the inkjet film. Example 1 demonstrates the excellent performance that can be achieved by using different polymer matrices, especially in terms of ink absorption efficiency, weather resistance and degradation performance. Example 2 shows that even if the same polymer matrix is ​​used, the desired performance can be obtained by adjusting the proportion of additives. Example 3 demonstrates the flexibility and possibilities when selecting different polymer matrices. These embodiments together demonstrate the effectiveness of the present invention in preparing efficient, environmentally friendly and durable inkjet films.

[0055] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0056] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A degradable advertising inkjet film, characterized in that: It includes a flashing ink-absorbing layer, a degradation start layer and a main body layer arranged between the flashing ink-absorbing layer and the degradation start layer: The flashing ink-absorbing layer has the following composition percentages: Glitter additive: 1%-3%; UV absorber: 1%-2%; Graphene nanosheets modified titanium oxide photocatalytic layer: 0.5%-1%; Ink absorbent: 2%-4%; Additives: 0.5%-1%; Polymer matrix: 88.5%-93.5%; The main layer, its component percentages are: Polymer matrix: 55%-65%; Nanocellulose enhancer: 1%-3%; Polymer-based cross-linking agent: 3%-5%; Pigment or dye: 2%-4%; Additives: 0%-2%; Degradation initiation layer, the percentage of its components is: Microbial enzyme complex: 0.3%-0.7%; Enzyme stabilizer: 0.1%-0.3%; Polymer matrix: 99.0%-99.6%.

2. A degradable advertising inkjet film according to claim 1, characterized in that: The polymer matrix is ​​selected from a block copolymer of polylactic acid and polyhydroxyalkanoate, polylactic acid, polyhydroxyalkanoate or polycaprolactone.

3. The degradable advertising inkjet film according to claim 1, characterized in that: The microbial enzyme complex comprises the following components in percentage: 20%-30% lipase, 30%-40% protease and 40%-50% cellulase.

4. The degradable advertising inkjet film according to claim 1, characterized in that: The glitter additive is selected from one or more of mica flakes, glass beads, aluminum powder or silver powder, and its particle size range is between 1-10 microns.

5. The degradable advertising inkjet film according to claim 1, characterized in that: The ultraviolet absorber is a benzotriazole compound, and the ink absorber is a porous silicon-based material or nanocellulose.

6. The degradable advertising inkjet film according to claim 1, characterized in that: The additives in the flashing ink-absorbing layer include antioxidants and anti-ultraviolet aging agents, which are mixed with other components when preparing the flashing ink-absorbing layer; the additives in the main layer include leveling agents and defoaming agents, which are mixed with other components when preparing the main layer.

7. The degradable advertising inkjet film according to claim 1, characterized in that: The enzyme stabilizer is selected from one of trehalose and mannitol.

8. The degradable advertising inkjet film according to claim 1, characterized in that: The graphene nanosheet-modified titanium oxide photocatalytic layer is prepared by the following steps: mixing the graphene nanosheets with a titanium oxide precursor solution, ultrasonically dispersing for 30-60 minutes under normal pressure and inert atmosphere, hydrothermally reacting at 150-200° C. for 4-8 hours, and then heat treating at 300-400° C. for 1-2 hours to obtain a catalytic layer.

9. A method for preparing a degradable advertising inkjet film, characterized in that: The following steps are involved: S1: Prepare the raw materials required for each layer and ensure that their purity and specifications meet the predetermined requirements; S2: According to the component percentages of the degradable advertising inkjet film according to any one of claims 1 to 8, the raw materials of each layer are accurately weighed and mixed evenly, and pre-dispersed or pre-reacted if necessary; S3: Using coating, co-extrusion or lamination film-forming process, first forming a degradation initiation layer, then forming a main layer thereon, and finally forming a flash ink-absorbing layer on the main layer, thereby obtaining a composite film, and controlling the thickness and uniformity of each layer; S4: heat treating the composite film to solidify the coating, then cooling it to room temperature, and performing surface treatment as needed to ensure the stability and performance of the film layer; S5: Carry out quality inspection on finished products. Inspection items include appearance inspection, physical property test and degradation performance test to ensure that the products meet the design requirements.

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