CN111383513A - Manufacturing method of single-layer transparent plastic substrate water label - Google Patents
Manufacturing method of single-layer transparent plastic substrate water label Download PDFInfo
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- CN111383513A CN111383513A CN201811651971.7A CN201811651971A CN111383513A CN 111383513 A CN111383513 A CN 111383513A CN 201811651971 A CN201811651971 A CN 201811651971A CN 111383513 A CN111383513 A CN 111383513A
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- transparent plastic
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Laminated Bodies (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention relates to the field of package printing, in particular to a method for manufacturing a single-layer transparent plastic substrate water label, which comprises the following steps: step 1: printing, namely printing designed patterns on the front side and the back side of a transparent plastic substrate, wherein the ink used on the preset back side is ultraviolet light curing ink, tackifying resin in the ink is polyurethane acrylate prepolymer which is synthesized by multi-step reaction of polyethylene glycol, toluene 2, 4-diisocyanate, hydroxyethyl acrylate and absolute ethyl alcohol, and photoinitiator in the ink is 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide; step 2: coating adhesive, namely coating the adhesive on the back of the transparent plastic base material at least after the printing ink of the printed pattern is dried and solidified; the adhesive comprises the following components in parts by weight: 3 parts of photoinitiator bis (2, 4, 6-trimethylbenzoyl) phenylphosphine oxide, 95 parts of polyurethane acrylate prepolymer and 2 parts of auxiliary agent; and step 3: and (4) attaching, namely attaching the base material after gluing to an opaque substrate material to complete the whole manufacturing process.
Description
Technical Field
The invention relates to the field of package printing, in particular to a method for manufacturing a transparent plastic substrate water label.
Background
The water label is a printed matter using transparent plastic as a base material and is mainly used for package identification of transparent drinks such as mineral water and the like.
The prior water labels mainly comprise two types, one type is single-layer printing, namely, only one surface of a transparent plastic substrate is provided with a printing pattern; another type has printed patterns on both sides, and the base material has at least two layers, which can be seen in fig. 1 specifically, it includes a first printed pattern layer 100, a first transparent plastic base material 200, a second printed pattern layer 300, a first adhesive layer 400, a second transparent plastic base material layer 500, a second adhesive layer 600 and a substrate layer 700 from top to bottom. When in use, the water label is torn off from the substrate layer and attached to the beverage bottle. Or as shown in fig. 2, it includes, from top to bottom, a first printed pattern layer 100, a first transparent plastic substrate 200, a first adhesive layer 400, a second printed pattern layer 300, a second transparent plastic substrate layer 500, a second adhesive layer 600 and a substrate. The water label with the structure has the advantages of complex manufacturing process, large glue consumption and high manufacturing cost.
Disclosure of Invention
In view of the problems raised in the background art, the invention provides a method for manufacturing a water label with a single-layer transparent plastic substrate, which comprises the following steps:
step 1: printing, namely printing designed patterns on the front side and the back side of a transparent plastic substrate, wherein the ink used on the preset back side is ultraviolet light curing ink, tackifying resin in the ink is polyurethane acrylate prepolymer which is synthesized by multi-step reaction of polyethylene glycol, toluene 2, 4-diisocyanate, hydroxyethyl acrylate and absolute ethyl alcohol, and photoinitiator in the ink is 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide;
step 2: coating adhesive, namely coating the adhesive on the back of the transparent plastic base material at least after the printing ink of the printed pattern is dried and solidified; the adhesive comprises the following components in parts by weight: 3 parts of photoinitiator bis (2, 4, 6-trimethylbenzoyl) phenylphosphine oxide, 95 parts of polyurethane acrylate prepolymer and 2 parts of auxiliary agent;
and step 3: and (4) attaching, namely attaching the base material after gluing with an opaque substrate material to finish the manufacturing process of the whole water label.
When the adhesive is used, the water label is torn off from the base material and is stuck on a beverage bottle, and the ultraviolet light is used for irradiating for 10-20 seconds to promote the adhesive to be further bonded.
The printing ink used for printing the back of the plastic substrate in the step 1 is ultraviolet light curing printing ink, and tackifying resin in the components is polyurethane acrylate prepolymer which is synthesized by multi-step reaction of polyethylene glycol, toluene 2, 4-diisocyanate, hydroxyethyl acrylate and absolute ethyl alcohol; 2,4, 6-trimethylbenzoyldiphenylphosphine oxide forms finely divided fragments under UV irradiation, which promotes rapid curing of the urethane acrylate prepolymer, resulting in the setting of the ink pattern. The adhesive used in the gluing in the step 2 mainly comprises a polyurethane acrylate prepolymer, and the substance synthesized by polyethylene glycol, toluene 2, 4-diisocyanate, hydroxyethyl acrylate and absolute ethyl alcohol through multi-step reaction has the characteristics of strong adhesive viscosity and ageing resistance.
The synthesis process of the urethane acrylate prepolymer used in the present invention is as follows: adding toluene 2, 4-diisocyanate into a conventional reaction vessel provided with a stirrer, a thermometer, a condenser pipe, a nitrogen introducing pipe and a constant pressure funnel, stirring at room temperature, slowly dropping polyethylene glycol from the constant pressure funnel, slowly heating, setting the reaction temperature to be 40 ℃, reacting for 3 hours, then dropping hydroxyethyl acrylate (containing a proper amount of catalyst), simultaneously adding a proper amount of polymerization inhibitor, gradually heating to 70 ℃, and reacting for about 2 hours (the content of free isocyanate is lower at the moment). And finally, when the temperature in the container is reduced to 50 ℃, adding a proper amount of absolute ethyl alcohol to react for 20 minutes, and performing suction filtration. Thus obtaining the urethane acrylate prepolymer.
The single-layer transparent plastic base material water label prepared by the process has the advantages of less glue consumption, low price, better permeability and more suitability for serving as a package marker of a transparent beverage bottle.
Preferably, in the above method, the adhesive used in step 2 further comprises 10 parts of tackifying resin, wherein the tackifying resin is acrylate copolymer, and the acrylate copolymer is prepared by multi-step polymerization of vinyl acetate, butyl acrylate and isooctyl acrylate under the action of an initiator. The synthesis method comprises the following steps: uniformly mixing 30 parts of vinyl acetate, 20 parts of butyl acrylate and 50 parts of isooctyl acrylate, and taking out a mixture of about 1/3; the initiator is a mixture of BPO (t-butyl hydroperoxide) and AIBN (azobisisobutyronitrile) and is used in an amount of about 1 part. 1/4 parts of initiator BPO is dissolved in the mixture taken out, the container containing the mixture is heated in water bath and stirred, after the temperature is rapidly raised to 90 ℃, the mixture is stirred at constant temperature for about 20 minutes, the mixed solution of the rest mixture and 1/2 parts of initiator BPO is dripped, after the dripping is finished, the constant temperature reaction is carried out for about 3 hours, then the rest 1/4 parts of initiator AIBN is added, and the reaction is continued for about 1 hour, so that the tackifying resin is obtained.
The tackifying resin is used to further enhance the strength of the adhesive and make the bonding more firm.
Preferably, in the above method, the thickness of the paste applied in step 2 is 0.005mm to 0.1 mm. Generally, in order to ensure better bonding effect, the thickness of the glue coating is 0.15-0.2mm, but the novel adhesive used in the invention can make the glue thinner, and the adhesive is transparent, so that the back printing pattern display is not affected.
Drawings
Fig. 1 is a schematic cross-sectional view of a prior art water label with a double-layer transparent plastic substrate.
Fig. 2 is a schematic cross-sectional view of another prior art two-layer transparent plastic substrate water label.
Fig. 3 is a schematic cross-sectional structure diagram of a water label with a single-layer transparent plastic substrate provided by the invention.
The reference numbers illustrate:
100-first print pattern layer; 200-a first transparent plastic substrate; 300-second print pattern layer; 400-first adhesive layer; 500-second transparent plastic substrate layer; 600-second adhesive layer; 700-substrate layer.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings and the embodiments. It should be noted that the drawings are schematic diagrams, and some details of structures may be enlarged or reduced correspondingly.
Example 1
A manufacturing method of a single-layer transparent plastic base material water label comprises the following steps (the parts are all parts by mass):
step 1: printing, namely printing designed patterns on the front side and the back side of a transparent plastic substrate, wherein the ink used on the preset back side is ultraviolet light curing ink, tackifying resin in the ink is polyurethane acrylate prepolymer which is synthesized by multi-step reaction of polyethylene glycol, toluene 2, 4-diisocyanate, hydroxyethyl acrylate and absolute ethyl alcohol, and photoinitiator in the ink is 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide;
step 2: coating adhesive, namely coating the adhesive on the back of the transparent plastic base material at least after the printing ink of the printed pattern is dried and solidified, wherein the coating thickness is 0.02 mm; the adhesive comprises the following components in parts by weight: 3 parts of photoinitiator bis (2, 4, 6-trimethylbenzoyl) phenylphosphine oxide, 95 parts of polyurethane acrylate prepolymer and 2 parts of auxiliary agent;
and step 3: and (4) attaching, namely attaching the base material after gluing with an opaque substrate material to finish the manufacturing process of the whole water label.
When the adhesive is used, the water label is torn off from the base material and is stuck on a beverage bottle, and the ultraviolet light is used for irradiating for 10-20 seconds to promote the adhesive to be further bonded.
The printing ink used for printing the back of the plastic substrate in the step 1 is ultraviolet light curing printing ink, and tackifying resin in the components is polyurethane acrylate prepolymer which is synthesized by multi-step reaction of polyethylene glycol, toluene 2, 4-diisocyanate, hydroxyethyl acrylate and absolute ethyl alcohol; 2,4, 6-trimethylbenzoyldiphenylphosphine oxide forms finely divided fragments under UV irradiation, which promotes rapid curing of the urethane acrylate prepolymer, resulting in the setting of the ink pattern. The adhesive used in the gluing in the step 2 mainly comprises a polyurethane acrylate prepolymer, and the substance synthesized by polyethylene glycol, toluene 2, 4-diisocyanate, hydroxyethyl acrylate and absolute ethyl alcohol through multi-step reaction has the characteristics of strong adhesive viscosity and ageing resistance.
The synthesis process of the urethane acrylate prepolymer used in the present invention is as follows: adding toluene 2, 4-diisocyanate into a conventional reaction vessel provided with a stirrer, a thermometer, a condenser pipe, a nitrogen introducing pipe and a constant pressure funnel, stirring at room temperature, slowly dropping polyethylene glycol from the constant pressure funnel, slowly heating, setting the reaction temperature to be 40 ℃, reacting for 3 hours, then dropping hydroxyethyl acrylate (containing a proper amount of catalyst), simultaneously adding a proper amount of polymerization inhibitor, gradually heating to 70 ℃, and reacting for about 2 hours (the content of free isocyanate is lower at the moment). And finally, when the temperature in the container is reduced to 50 ℃, adding a proper amount of absolute ethyl alcohol to react for 20 minutes, and performing suction filtration. Thus obtaining the urethane acrylate prepolymer.
The single-layer transparent plastic base material water label prepared by the process has the advantages of less glue consumption, low price, better permeability and more suitability for serving as a package marker of a transparent beverage bottle.
The components of the ultraviolet curing ink are as follows: 5 parts of nanometer fine pigment, 40 parts of tackifying resin, 47 parts of diluent, 3 parts of auxiliary agent, 3 parts of initiator 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide and 5 parts of attapulgite. The diluent here is an acrylate.
The auxiliary agents are leveling agents, defoaming agents and the like which are commonly used in the art.
Example 2
In this embodiment, step 2: coating adhesive, namely coating the adhesive on the back of the transparent plastic base material at least after the printing ink of the printed pattern is dried and solidified; the adhesive comprises the following components in parts by weight: 3 parts of photoinitiator bis (2, 4, 6-trimethylbenzoyl) phenylphosphine oxide, 95 parts of polyurethane acrylate prepolymer, 2 parts of auxiliary agent and 10 parts of tackifying resin (in parts by mass). The tackifying resin is acrylate copolymer which is prepared by multi-step polymerization reaction of vinyl acetate, butyl acrylate and isooctyl acrylate under the action of an initiator. The synthesis method comprises the following steps: uniformly mixing 30 parts of vinyl acetate, 20 parts of butyl acrylate and 50 parts of isooctyl acrylate, and taking out a mixture of about 1/3; the initiator is a mixture of BPO (t-butyl hydroperoxide) and AIBN (azobisisobutyronitrile) and is used in an amount of about 1 part. 1/4 parts of initiator BPO is dissolved in the mixture taken out, the container containing the mixture is heated in water bath and stirred, after the temperature is rapidly raised to 90 ℃, the mixture is stirred at constant temperature for about 20 minutes, the mixed solution of the rest mixture and 1/2 parts of initiator BPO is dripped, after the dripping is finished, the constant temperature reaction is carried out for about 3 hours, then the rest 1/4 parts of initiator AIBN is added, and the reaction is continued for about 1 hour, so that the tackifying resin is obtained.
Preparation of comparative example
The corresponding water label was prepared according to the procedure of example 1, using conventional inks and adhesives. Comparative test data are recorded as in table 1 below.
TABLE 1
| Serial number | Whether the underlying pattern is blurred or not | Peel strength N/25mm |
| Example 1 | Whether or not | 28.56 |
| Example 2 | Whether or not | 32.64 |
| Comparative examples | Is that | 17.14 |
The comparison shows that the water label provided by the invention has better performance, saves more materials and has lower cost.
The cross-sectional structure of the single-layer transparent plastic substrate water label prepared by the invention is shown in the attached figure 3, and comprises the following components from top to bottom: a first print pattern layer 100; a first transparent plastic substrate 200 and a second printed pattern layer 300; a first adhesive layer 400 and a substrate 700.
The transparent plastic substrate can be PET, OPP, etc., and has a thickness of 0.0.5-0.2 mm.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (3)
1. A method for manufacturing a single-layer transparent plastic substrate water label comprises the following steps:
step 1: printing, namely printing designed patterns on the front side and the back side of a transparent plastic substrate, wherein the ink used on the preset back side is ultraviolet light curing ink, tackifying resin in the ink is polyurethane acrylate prepolymer which is synthesized by polyethylene glycol, toluene 2, 4-diisocyanate, hydroxyethyl acrylate and absolute ethyl alcohol through multi-step reaction, and photoinitiator in the ink is 2,4, 6-trimethylbenzoyl diphenyl phosphine oxide;
step 2: coating adhesive, namely coating the adhesive on the back of the transparent plastic base material at least after the printing ink of the printed pattern is dried and solidified; the adhesive comprises the following components in parts by weight: 3 parts of photoinitiator bis (2, 4, 6-trimethylbenzoyl) phenylphosphine oxide, 95 parts of polyurethane acrylate prepolymer and 2 parts of auxiliary agent;
and step 3: and (4) attaching, namely attaching the base material after gluing with an opaque substrate material to finish the manufacturing process of the whole water label.
2. The method for manufacturing a single-layer transparent plastic substrate water label according to claim 1, wherein the adhesive used in step 2 further comprises 10 parts of tackifying resin, wherein the tackifying resin is acrylate copolymer which is prepared by multi-step polymerization of vinyl acetate, butyl acrylate and isooctyl acrylate under the action of an initiator.
3. A method of manufacturing a water label with a single layer of transparent plastic substrate as claimed in claim 1, wherein the thickness of the glue applied in step 2 is 0.005mm-0.1 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651971.7A CN111383513A (en) | 2018-12-31 | 2018-12-31 | Manufacturing method of single-layer transparent plastic substrate water label |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811651971.7A CN111383513A (en) | 2018-12-31 | 2018-12-31 | Manufacturing method of single-layer transparent plastic substrate water label |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316174A (en) * | 2021-12-29 | 2022-04-12 | 重庆交通大学 | High molecular weight linear urethane acrylate prepolymer, dielectric elastomer and preparation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316174A (en) * | 2021-12-29 | 2022-04-12 | 重庆交通大学 | High molecular weight linear urethane acrylate prepolymer, dielectric elastomer and preparation |
| CN114316174B (en) * | 2021-12-29 | 2023-10-03 | 重庆交通大学 | High molecular weight linear polyurethane acrylate prepolymer, dielectric elastomer and preparation thereof |
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