Printing material, method for processing printing material, and method for producing polyester-containing material

Abstract

The invention provides a printing material, a method for processing the printing material, and a method for producing a polyester-containing material. The printing material comprises a base material and an easy-to-adhere layer. The material of the base material comprises a polyester material. The easy-to-adhere layer is located on the substrate. And the material of the easy-to-adhere layer comprises acryl resin, polyester resin, polyurethane resin, silicon dioxide, an antistatic agent or a combination thereof.

Description

Technical Field

[0001] The present invention relates to a printing material, and particularly to a printing material, a processing method of the printing material, and a manufacturing method of a polyester-containing product. Background Art

[0002] Based on the global trend of environmental protection and pollution prevention, the demand for material recycling in the printing industry is gradually increasing. However, the substrates currently used in the printing industry are not easily recycled and reused, thus failing to reduce pollutants or waste, which will cause harm to the environment, or failing to achieve the concepts of energy conservation or material saving during product manufacturing. Summary of the Invention

[0003] The present invention provides a printing material, a processing method of the printing material, and a manufacturing method of a polyester-containing product that can effectively achieve environmental protection effects.

[0004] A printing material of the present invention includes a substrate and an easy-to-adhere layer. The material of the substrate includes a polyester material. The easy-to-adhere layer is located on the substrate. The material of the easy-to-adhere layer includes an acrylic resin, a polyester resin, a polyurethane resin, silica, an antistatic agent, or a combination thereof.

[0005] In an embodiment of the present invention, the above-mentioned polyester material is a recycled polyester material.

[0006] In an embodiment of the present invention, the above-mentioned printing material is an aqueous flexographic ink printing material or a UV flexographic ink printing material.

[0007] A processing method of a printing material of the present invention includes: providing a printing material; performing an acid washing step or an alkali washing step on the printing material to remove the easy-to-adhere layer to obtain a polyester-containing solid. The printing material includes a substrate and an easy-to-adhere layer located on the substrate. The material of the substrate includes a polyester material. The material of the easy-to-adhere layer includes an acrylic resin, a polyester resin, a polyurethane resin, silica, an antistatic agent, or a combination thereof.

[0008] In an embodiment of the present invention, the processing method of the above-mentioned printing material further includes: performing an acid washing step on the printing material to obtain a first polyester-containing solid; and performing an alkali washing step on the first solid to obtain a second polyester-containing solid.

[0009] In an embodiment of the present invention, the processing method of the above-mentioned printing material further includes: performing an alkali washing step on the printing material to obtain a first polyester-containing solid; and performing an acid washing step on the first solid to obtain a second polyester-containing solid.

[0010] In an embodiment of the present invention, the pickling step includes: immersing the printed material in an acid solution for pickling. The acid equivalent of the acid solution is the same as that of a mixed solution formed by dodecylbenzenesulfonic acid and paraffin oil in a weight ratio of 20:80 to 30:70.

[0011] In an embodiment of the present invention, the alkali washing step includes: immersing the printed material in an alkali solution for alkali washing. The alkali equivalent of the alkali solution is the same as that of an aqueous sodium hydroxide solution with a weight percentage concentration of 7% to 13%.

[0012] In an embodiment of the present invention, volatile organic solvents are not used during the process of the above-mentioned method for treating printed materials.

[0013] A method for manufacturing a polyester-containing product of the present invention includes: using a polyester-containing solid obtained or produced by the above-mentioned method for treating printed materials.

[0014] Based on the above, the printed material of the present invention includes a substrate and an easy-to-adhere layer located on the substrate, and the material of the substrate includes a polyester material. Thus, the printed material can be recycled by the method for treating printed materials to achieve an environmental protection effect. In addition, the polyester-containing solid obtained or produced by the method for treating printed materials can achieve a reuse effect through the method for manufacturing a polyester-containing product.

[0015] To make the above features and advantages of the present invention more obvious and understandable, specific embodiments are given below for detailed description. Detailed Embodiments

[0016] The following are embodiments that describe the content of the present invention in detail. The implementation details proposed in the embodiments are for illustrative purposes and do not limit the scope of protection of the content of the present invention. Any person with ordinary knowledge in the relevant technical field can modify or change these implementation details according to the actual implementation requirements. In addition, descriptions of well-known devices, methods, and materials can be omitted to avoid obscuring the description of various principles of the present invention.

[0017] Ranges can be expressed herein as from “about” a particular value to “about” another particular value, or they can be directly expressed as a particular value and / or to another particular value. When expressing such a range, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when a value is expressed as an approximation by using the antecedent “about”, it will be understood that the particular value forms another embodiment. It will be further understood that the endpoints of each range are clearly related or unrelated to the other endpoint.

[0018] In this document, non-limiting terms (such as: may, can, for example, or other similar terms) are non-essential or optional implementations, inclusions, additions, or existences.

[0019] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with their meaning in the relevant technical context and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0020] <Printed material>

[0021] The present invention provides a printed material, comprising a substrate and an easy-to-adhere layer. Additionally, the printed material of the present invention may further include other suitable layers as required.

[0022] The material of the substrate includes a polyester material, preferably a recycled polyester material. The polyester material may include polymers commonly known as polyesters, particularly aromatic polyesters. In this article, it particularly refers to polyesters derived from terephthalic acid (PTA) and ethylene glycol (EG) (i.e., polyethylene terephthalate (PET)).

[0023] The recycled polyester material may be a recycled thermoplastic polyester elastomer. The recycled thermoplastic polyester elastomer can be obtained by recycling articles or waste materials including polyethylene terephthalate (PET). The articles or waste materials including polyethylene terephthalate are not particularly limited, and appropriate articles or waste materials can be selected according to requirements. For example, the articles or waste materials including polyethylene terephthalate may include PET bottles, industrial edge materials, fabrics, shoes, film materials, packaging bags or other suitable articles or waste materials.

[0024] In other embodiments, the polyester material may also be polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate or a combination thereof, preferably polyethylene terephthalate, polytrimethylene terephthalate or a combination thereof. In other embodiments, the polyester material may also be a copolymer, such as a copolymer obtained by using two or more dicarboxylic acids and / or two or more glycol components. In other embodiments, the material of the substrate may not include polyurethane (such as polyurethane resin or polyurethane-containing analogs) or polyacrylic acid (such as acrylic resin).

[0025] The thickness of the substrate may be about 19 microns to about 350 microns, preferably about 50 microns to about 250 microns.

[0026] The easy - adhering layer is located on the substrate. For example, there may be other suitable layers between the easy - adhering layer and the substrate, or the two may be in direct contact. In this embodiment, the easy - adhering layer is in direct contact with the substrate. The materials of the easy - adhering layer include acrylic resin, polyester resin, polyurethane resin, silica, antistatic agent, or a combination thereof, preferably acrylic resin, silica, antistatic agent, or a combination thereof. The antistatic agent may include conductive carbon materials, ionic liquid antistatic agents, conductive polymer - type antistatic agents, or a combination thereof, preferably conductive polymer - type antistatic agents. The ionic liquid antistatic agent may include cationic antistatic agents, anionic antistatic agents, or zwitterionic antistatic agents. In this embodiment, the easy - adhering layer is a water - based easy - adhering layer. When the easy - adhering layer is a water - based easy - adhering layer, the amount of solvent required for producing the printing material can be reduced, thereby meeting the environmental protection requirements of reducing pollutants or waste.

[0027] The thickness of the easy - adhering layer can be about 0.3 microns to about 2.5 microns, preferably about 0.5 microns to about 1.7 microns.

[0028] In this embodiment, the printing material can be a water - based flexographic ink printing material or a UV flexographic ink printing material. When the printing material is a water - based flexographic ink printing material or a UV flexographic ink printing material, the amount of solvent required for producing the printing material can be reduced, the processability can be improved, and thereby the environmental protection requirements of reducing energy consumption, pollutants, or waste can be met.

[0029] The printing material can be applied to UV printing, laser digital printing, or other suitable printing methods, preferably UV printing.

[0030] <Method for treating the printing material>

[0031] The present invention also provides a method for treating a printing material, including: providing a printing material; performing an acid - washing step or an alkali - washing step on the printing material to remove the easy - adhering layer to obtain a polyester - containing solid.

[0032] The printing material can be the above - mentioned printing material.

[0033] For example, the step of providing the printing material may include: providing a printing material including a substrate and an easy - adhering layer located on the substrate, wherein the material of the easy - adhering layer can be applied to the substrate by comma coating, roll coating, or other suitable methods; and the material of the easy - adhering layer can be cured to form the easy - adhering layer by heat drying, ultraviolet light (UV light) irradiation, or other suitable methods. The printing material can be a printing material before use or a printing material after use (for example, a printing material that has been used in printing production). The printing material after use may vary slightly in appearance or material. For example, the printing material after use may have slight damage, creases, or other usage marks in appearance.

[0034] The step of removing the easy - adhering layer may include: subjecting the printed material (especially the used printed material) to an acid - washing step or an alkali - washing step to remove the easy - adhering layer.

[0035] In this embodiment, the process of performing the acid - washing step or the alkali - washing step may include: subjecting the printed material to an acid - washing step or an alkali - washing step to obtain a first solid containing polyester; and subjecting the first solid to an alkali - washing step or an acid - washing step to obtain a second solid containing polyester. For example, the acid - washing step can be carried out first to obtain a first solid containing polyester, and then the first solid is subjected to an alkali - washing step to obtain a second solid containing polyester; or the alkali - washing step can be carried out first to obtain a first solid containing polyester, and then the first solid is subjected to an acid - washing step to obtain a second solid containing polyester; preferably, the alkali - washing step is carried out first and then the acid - washing step. The acid - washing step and the alkali - washing step are not carried out simultaneously.

[0036] In this embodiment, the alkali - washing step may include: immersing the material (such as the printed material or the first solid) in an alkali solution for alkali - washing. The alkali equivalent of the alkali solution is the same as that of an aqueous sodium hydroxide solution with a weight percentage concentration of about 7 wt% to about 13 wt%, preferably the alkali equivalent of an aqueous sodium hydroxide solution with a weight percentage concentration of about 8 wt% to about 10 wt%. During the process of immersing the material in the alkali solution, heating can be carried out as needed. For example, the alkali solution can be heated to about 50°C to about 70°C, preferably about 60°C, while the material is being immersed in the alkali solution.

[0037] In this embodiment, the acid - washing step may include: immersing the material (such as the printed material or the first solid) in an acid solution for acid - washing. The acid equivalent of the acid solution is the same as that of a mixed solution formed by dodecylbenzenesulfonic acid and paraffin oil in a weight ratio of about 20:80 to about 30:70, preferably the acid equivalent of a mixed solution formed by dodecylbenzenesulfonic acid and paraffin oil in a weight ratio of about 23:77 to about 25:75. For example, through the acid - washing step, a corresponding chain - cleavage reaction can occur in the material. The residues generated after the chain - cleavage reaction can further undergo corresponding depolymerization by backbiting to form compounds suitable for removal by water washing, such as bis - 2 - Hydroxylethyl terephthalate (BHET) and / or ethylene glycol (EG).

[0038] Compared with the printed material before the acid - washing step and / or the alkali - washing step, the removal rate of the easy - adhering layer in the printed material after the acid - washing step and / or the alkali - washing step can be about 98% or more, preferably about 99% or more, more preferably about 100%.

[0039] After performing the pickling step and / or the alkali washing step, the obtained polyester-containing solid substantially comprises recycled materials of polyester (such as sheet-shaped, granular or powdered recycled polyester-containing substrates). After performing the alkali washing step or the pickling step to obtain a polyester-containing solid (such as the first solid or the second solid), the solid can be separated by filtration or other suitable means. In this article, the "solid" is not limited to the requirement that the object must be completely solid. For example, the "solid" can include sheet-shaped, strip-shaped, powdered and / or granular solids; and liquids attached to the solid or located between two such solids by capillary action. The "solid" can be dried by appropriate means (such as heat drying and / or vacuum drying) to obtain a solid with almost no liquid. Based on the total weight of the "solid", the weight of the dried solid can be about 80% or more, preferably about 90% or more, more preferably about 95% or more.

[0040] In this embodiment, volatile organic solvents may not be used during the process of the method for treating the printed material. Volatile organic solvents are organic solvents or co-solvents containing volatile organic compounds (VOCs). For example, volatile organic solvents can include formaldehyde, methanol, formic acid, toluene, methyl isobutyl ketone (MIBK), dichloromethane (DCM), trichloroethylene, acetonitrile (ACN), ethyl acetate (EA), hexane, acetone (DMK), isopropanol (IPA), methyl ethyl ketone (MEK), dimethylacetamide (DMAC), dimethylformamide (DMF), proprylene glycol monomethyl ether (PM), diethyl ether or other volatile organic solvents. When volatile organic solvents are not used during the process of treating the printed material, the amount of solvent used for recycling the printed material can be reduced, thereby meeting the environmental protection requirements of reducing pollutants or waste.

[0041] <Method for manufacturing a polyester-containing product>

[0042] The present invention also provides a method for manufacturing a polyester-containing product, including: using a solid polyester-containing product obtained or produced by the above-mentioned method for treating printing materials.

[0043] The solid polyester-containing product can be recycled polyester material. For example, the method for manufacturing a polyester-containing product can include: providing a solid polyester-containing product; physically recycling part of the solid polyester-containing product to form a physically recycled polyester material with a first intrinsic viscosity; chemically recycling part of the solid polyester-containing product to form a chemically recycled polyester material with a second intrinsic viscosity; and mixing the physically recycled polyester material and the chemically recycled polyester material to form a recycled polyester material with a predetermined intrinsic viscosity. The first intrinsic viscosity of the physically recycled polyester material is different from the second intrinsic viscosity of the chemically recycled polyester material, preferably the second intrinsic viscosity is less than the first intrinsic viscosity. The first intrinsic viscosity of the physically recycled polyester material can be about 0.55 dL / g to about 0.9 dL / g, preferably about 0.65 dL / g to about 0.8 dL / g. The second intrinsic viscosity of the chemically recycled polyester material can be about 0.4 dL / g to about 0.75 dL / g, preferably about 0.5 dL / g to about 0.65 dL / g.

[0044] The recycled polyester material can be in powder or granular form. For example, through the granulation method commonly used for general polymer granules, the recycled polyester material obtained during the treatment process can be extruded and / or pelletized using an extruder to form recycled polyester pellets. The recycled polyester pellets can then be further processed through a suitable recycling process to be made into a substrate suitable for printing materials or other suitable polyester products (such as polyester films, fabrics, containers, sheets, packaging materials, etc.). The recovery rate of the polyester material can be about 90% or more, preferably about 94% or more.

[0045] In summary, the printing material of the present invention includes a substrate containing polyester material, which enables the printing material to be recycled using its treatment method to achieve an environmental protection effect. In addition, the solid polyester-containing product obtained or produced by the treatment method of the printing material can be further formed into a recycled polyester material through the method for manufacturing a polyester-containing product to achieve the effect of reuse.

[0046] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A printed material comprising: A substrate, wherein the material of the substrate comprises a polyester material; as well as The easy-bonding layer is located on the substrate, and the material of the easy-bonding layer includes acrylic resin, polyester resin, polyurethane resin, silicon dioxide, antistatic agent or a combination thereof. 2 . The printed material according to claim 1 , wherein the polyester material is a recycled polyester material. 3 . The printing material according to claim 1 , wherein the printing material is a water-based flexographic ink printing material or a UV flexographic ink printing material.

4. A method for processing printed materials, comprising: Provide a printing material, the printing material comprising a substrate and an easy-bonding layer located on the substrate, the material of the substrate comprising a polyester material, and the material of the easy-bonding layer comprising an acrylic resin, a polyester resin, a polyurethane resin, silicon dioxide, an antistatic agent or a combination thereof; The printed material is subjected to an acid washing step or an alkali washing step to remove the easy bonding layer, so as to obtain a solid material containing polyester.

5. The method for processing printed materials according to claim 4, further comprising: The printed material is subjected to the acid washing step to obtain a first solid containing polyester; as well as The first solid is subjected to the alkali washing step to obtain a second solid containing polyester.

6. The method for processing printed materials according to claim 4, further comprising: The printed material is subjected to the alkali washing step to obtain a first solid containing polyester; as well as The first solid is subjected to the acid washing step to obtain a second solid containing polyester.

7. The method for processing printed materials according to claim 4, wherein the pickling step comprises: The printed material is immersed in an acid solution to be pickled, The acid equivalent of the acid solution is the same as the acid equivalent of a mixed solution of dodecylbenzenesulfonic acid and paraffin oil in a weight ratio of 20:80 to 30:

70.

8. The method for treating printed materials according to claim 4, wherein the alkali washing step comprises: The printed material is immersed in an alkali solution to perform alkali washing, The alkali equivalent of the alkali solution is the same as the alkali equivalent of a sodium hydroxide aqueous solution having a weight percentage concentration of 7% to 13%.

9. The method for processing printed materials according to claim 4, wherein no volatile organic solvent is used during the process of performing the method for processing printed materials.

10. A method for producing a polyester-containing article, comprising: A polyester-containing solid obtained or produced by the method for processing a printing material according to any one of claims 4 to 9.