Treatment method of printing material and manufacturing method of polyester-containing object

Abstract

This invention provides a printing material, a method for processing the printing material, and a method for manufacturing a polyester-containing material. The printing material includes a substrate and an easy-adhesion layer. The substrate is made of polyester. The easy-adhesion layer is located on the substrate. The easy-adhesion layer is made of acrylic resin, polyester resin, polyurethane resin, silicon dioxide, antistatic agent, or a combination thereof.

Description

Technical Field

[0001] The present invention relates to a printing material, and in particular to a printing material, a processing method of the printing material, and a method for manufacturing a polyester-containing object. Prior Art

[0002] Driven by global trends in environmental protection and pollution prevention, the demand for recycled materials used in the printing industry is increasing. However, the substrates currently used in the printing industry are difficult to recycle and reuse, making it difficult to reduce pollutants and waste, which harms the environment, or to achieve energy and material savings in the manufacturing process. Summary of the Invention

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

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

[0005] In one embodiment of the present invention, the polyester material is recycled polyester material.

[0006] In one embodiment of the present invention, the printing material is a water-based flexographic ink printing material or a UV flexographic ink printing material.

[0007] A method for processing printed materials according to the present invention comprises: providing a printed material; and subjecting the printed material to an acid wash step or an alkaline wash step to remove an easy-bonding layer, thereby obtaining a solid material containing polyester. The printed material comprises a substrate and an easy-bonding layer disposed on the substrate. The substrate comprises a polyester material. The easy-bonding layer comprises an acrylic resin, a polyester resin, a polyurethane resin, silicon dioxide, an antistatic agent, or a combination thereof.

[0008] In one embodiment of the present invention, the above-mentioned method for processing printed materials further includes: subjecting the printed materials to an acid washing step to obtain a first solid containing polyester; and subjecting the first solid to an alkali washing step to obtain a second solid containing polyester.

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

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

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

[0012] In one embodiment of the present invention, no volatile organic solvent is used during the process of performing the above-mentioned printing material processing method.

[0013] A method for producing a polyester-containing object of the present invention comprises: obtaining or producing a polyester-containing solid object using the above-mentioned method for processing printed materials.

[0014] Based on the above, the printing material of the present invention includes a substrate and an easily adhesive layer located on the substrate, wherein the substrate is made of a polyester material. Thus, the printing material can be recycled using a printing material processing method, thereby achieving environmental benefits. Furthermore, the polyester-containing solid obtained or produced by the printing material processing method can be reused through a polyester-containing material manufacturing method.

[0015] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below for detailed description. Simple diagram description

[0016] none Implementation Method

[0017] The following examples describe the present invention in detail. The implementation details provided in these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate the potential for modification or variation of these implementation details based on actual implementation requirements. Furthermore, descriptions of well-known devices, methods, and materials may be omitted to avoid obscuring the principles underlying the present invention.

[0018] Ranges may be expressed herein as from "about" one particular value to "about" another particular value, which can also be expressed directly as one particular value and / or to another particular value. When expressing a range, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when values are expressed as approximations 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 may be expressed both in relation to and independent of the other endpoint.

[0019] In this document, non-limiting terms (such as "may", "could", "for example" or other similar terms) mean that implementation, inclusion, addition or existence is not required or optional.

[0020] Unless otherwise defined, all terms used herein (including technical and scientific terms) 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 explicitly so defined herein. [<] [Printing Materials] [>]

[0021] The present invention provides a printing material comprising a substrate and an easy-bonding layer. Furthermore, the printing material of the present invention may further comprise other suitable layers as needed.

[0022] The substrate material includes a polyester material, preferably a recycled polyester material. The polyester material may include polymers commonly referred to as polyesters, particularly aromatic polyesters. In this context, this specifically refers to polyesters derived from terephthalic acid (PTA) and ethylene glycol (EG), such as polyethylene terephthalate (PET).

[0023] The recycled polyester material may be recycled thermoplastic polyester elastomer. Recycled thermoplastic polyester elastomer can be obtained by recycling items or waste materials containing polyethylene terephthalate (PET). The items or waste materials containing polyethylene terephthalate are not particularly limited and can be selected appropriately based on the needs. For example, items or waste materials containing polyethylene terephthalate may include plastic bottles, industrial earrings, fabrics, shoes, films, packaging bags, or other suitable items or waste materials.

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

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

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

[0027] The thickness of the easy-adhesion layer may be about 0.3 micrometers to about 2.5 micrometers, preferably about 0.5 micrometers to about 1.7 micrometers.

[0028] In this embodiment, the printing material may be a water-based flexographic ink printing material or a UV flexographic ink printing material. Using a water-based flexographic ink printing material or a UV flexographic ink printing material can reduce the amount of solvent required for printing material production, improve processability, and thereby achieve environmental protection requirements by reducing energy consumption, pollutants, and waste.

[0029] The printing material can be applied to UV printing, laser digital printing or other suitable printing methods, preferably UV printing. [<] [Handling methods for printed materials] [>]

[0030] The present invention also provides a method for processing printed materials, comprising: providing printed materials; subjecting the printed materials to an acid wash step or an alkaline wash step to remove the easy-bonding layer to obtain a polyester-containing solid.

[0031] The printed material may be the printed material described above.

[0032] For example, the step of providing a printing material may include: providing a printing material comprising a substrate and an easy-bonding layer on the substrate, wherein the easy-bonding layer material may be applied to the substrate by comma coating, roller coating, or other suitable methods; and curing the easy-bonding layer material by heating, drying, irradiating with ultraviolet light (UV light), or other suitable methods to form the easy-bonding layer. The printing material may be a pre-use printing material or a post-use printing material (e.g., a printing material that has already been printed). The appearance or material of the used printing material may slightly change. For example, the used printing material may show slight signs of use, such as damage or creases.

[0033] The step of removing the easy-bonding layer may include: subjecting the printed material (especially the used printed material) to an acid washing step or an alkaline washing step to remove the easy-bonding layer.

[0034] In this embodiment, the process of performing an acid wash step or an alkali wash step may include: performing an acid wash step or an alkali wash step on the printed material to obtain a first solid material containing polyester; and performing an alkali wash step or an acid wash step on the first solid material to obtain a second solid material containing polyester. For example, the acid wash step may be performed first to obtain the first solid material containing polyester, and then the first solid material may be performed an alkali wash step to obtain the second solid material containing polyester; or the alkali wash step may be performed first to obtain the first solid material containing polyester, and then the first solid material may be performed an acid wash step to obtain the second solid material containing polyester. Preferably, the alkali wash step is performed first and then the acid wash step. The acid wash step and the alkali wash step are not performed simultaneously.

[0035] In this embodiment, the alkali washing step may include immersing the material (e.g., printed material or first solid material) in an alkali solution for alkali washing. The alkali solution has an alkali equivalent weight equivalent to that of an aqueous sodium hydroxide solution having a concentration of approximately 7% to 13% by weight, preferably approximately 8% to 10% by weight. While immersing the material in the alkali solution, heating may be performed as needed. For example, the alkali solution may be heated to a temperature of approximately 50°C to approximately 70°C, preferably approximately 60°C, while the material is immersed in the alkali solution.

[0036] In this embodiment, the acid washing step may include immersing the material (e.g., printed material or first solid material) in an acid solution for acid washing. The acid solution has an acid equivalent weight equivalent to that of a mixed solution of dodecylbenzenesulfonic acid and paraffin oil in a weight ratio of approximately 20:80 to approximately 30:70, preferably approximately 23:77 to approximately 25:75. For example, the acid washing step may induce a corresponding chain cleavage reaction in the material. The residues generated by the chain cleavage reaction may further undergo backbiting depolymerization to form compounds suitable for removal by water washing, such as bis-2-hydroxyethyl terephthalate (BHET) and / or ethylene glycol (EG).

[0037] Compared with the printed material before the acid washing step and / or the alkali washing step, the removal rate of the easy-bonding 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, and more preferably about 100%.

[0038] After the acid washing step and / or the alkali washing step, the resulting polyester-containing solid material essentially comprises recycled polyester material (e.g., recycled polyester-containing substrate in the form of flakes, granules, or powder). After the alkali washing step or the acid washing step to obtain the polyester-containing solid material (e.g., the first solid material or the second solid material), the solid material can be separated by filtration or other suitable means. As used herein, "solid material" does not necessarily require the material to be completely solid. For example, "solid material" may include solid materials in the form of flakes, strips, powders, and / or granules; as well as liquids attached to the solid material or located between two solid materials by capillary action. The "solid material" can be dried by suitable means (e.g., heat drying and / or reduced pressure drying) to obtain a substantially liquid-free solid material. The weight of the dried solid material may be at least approximately 80%, preferably at least approximately 90%, and more preferably at least approximately 95%, based on the total weight of the "solid material."

[0039] In this embodiment, no volatile organic solvent is used during the process of processing the printed material. A volatile organic solvent is an organic solvent or co-solvent containing volatile organic compounds (VOCs). For example, volatile organic solvents may 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. Eliminating the use of volatile organic solvents during the processing of printed materials can reduce the amount of solvent required for recycling, thereby achieving environmental protection by reducing pollutants and waste. [<] [Method for producing polyester-containing article] [>]

[0040] The present invention also provides a method for producing a polyester-containing object, comprising: using the above-mentioned printing material processing method to obtain or produce a polyester-containing solid object.

[0041] The polyester-containing solid may be a recycled polyester material. For example, a method for producing a polyester-containing material may include: providing a polyester-containing solid; physically reprocessing a portion of the polyester-containing solid to form a physically recycled polyester material having a first intrinsic viscosity; chemically reprocessing a portion of the polyester-containing solid to form a chemically recycled polyester material having a second intrinsic viscosity; and mixing the physically recycled polyester material and the chemically recycled polyester material to form a recycled polyester material having 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, and preferably, the second intrinsic viscosity is less than the first intrinsic viscosity. The first intrinsic viscosity of the physically recycled polyester material may be from about 0.55 dL / g to about 0.9 dL / g, and preferably from about 0.65 dL / g to about 0.8 dL / g. The second intrinsic viscosity of the chemically recycled polyester material may be about 0.4 dL / g to about 0.75 dL / g, preferably about 0.5 dL / g to about 0.65 dL / g.

[0042] Recycled polyester material can be in powder or granular form. For example, the recycled polyester material obtained during processing can be extruded and / or pelletized using conventional pelletizing methods for polymer pellets to form recycled polyester pellets. The recycled polyester pellets can then be processed through appropriate processing steps to form substrates suitable for printing materials or other suitable polyester products (such as polyester film, fabric, containers, sheets, packaging materials, etc.). The recycling rate of the polyester material can be above approximately 90%, preferably above approximately 94%.

[0043] In summary, the printed material of the present invention includes a polyester-containing substrate, and its processing method allows for recycling of the printed material, thereby achieving environmental benefits. Furthermore, the polyester-containing solid obtained or produced by the printing material processing method can be further processed through a polyester-containing material manufacturing method to form a recycled polyester material, thereby achieving a reusable effect.

[0044] none

Claims

1. A method for processing printing materials, comprising: A printing material is provided, the printing material comprising a substrate and an easy-adhesion layer located on the substrate, the substrate being made of a polyester material and the easy-adhesion layer being made of silicon dioxide; the printing material is subjected to an acid washing step to remove the easy-adhesion layer to obtain a first solid containing polyester; and the first solid is subjected to an alkaline washing step to obtain a second solid containing polyester, wherein volatile organic solvents are not used in the process of processing the printing material, wherein the acid washing step comprises: immersing the printing material in an acid solution for acid washing, wherein 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.

2. A method for processing printing materials, comprising: A printing material is provided, the printing material comprising a substrate and an easy-adhesion layer located on the substrate, the substrate being made of a polyester material and the easy-adhesion layer being made of silicon dioxide; the printing material is subjected to an alkaline washing step to remove the easy-adhesion layer to obtain a first solid containing polyester; and the first solid is subjected to an acid washing step to obtain a second solid containing polyester, wherein no volatile organic solvents are used in the processing of the printing material, wherein the acid washing step comprises: immersing the printing material in an acid solution for acid washing, wherein 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.

3. A method for processing printing materials as described in claim 1 or 2, wherein the alkaline washing step comprises: The printing material is immersed in an alkaline solution for alkaline washing, wherein the alkaline equivalent of the alkaline solution is the same as the alkaline equivalent of an aqueous sodium hydroxide solution with a weight percentage concentration of 7% to 13% (w / w).

4. A method for manufacturing a polyester-containing material, comprising: Polyester-containing solids obtained or produced by the processing method of the printing material used in any one of claims 1 to 3.