A kind of UV inkjet printing film and preparation method thereof

Abstract

The invention relates to the technical field of printing films, in particular to a UV inkjet printing film and a preparation method thereof. The film comprises a PET base film, wherein a water-based functional pre-coating layer is arranged on the surface of the PET base film, wherein the mass percentage of the water-based functional pre-coating layer is as follows: 60-80% of a dicyclopentenyloxyethyl acrylate acrylic acid polymer; 19.5-39.5% of a water-based polymer resin; and 0.1-0.5% of a water-based substrate wetting agent; and the sum of all the above components is 100%. The invention adopts heat-resistant PET as a base film, and double-sided coatings of a functional pre-coating layer are applied on the surface of a film, wherein the water-based pre-coating layer contains dicyclopentenyloxyethyl acrylate, and the cyclopentenyl group is solidified integrally with an upper layer of inkjet UV ink, instead of adjusting the polarity of a compounded pre-coating water-based polymer resin to achieve interlayer adhesion with an upper layer of UV ink through similar compatibility, so that the printing film can achieve compatibility with inks from different manufacturers, thereby eliminating the inconvenience of use.

Description

Technical Field

[0001] The invention relates to the technical field of printing films, in particular to a UV inkjet printing film and a preparation method thereof. Background Art

[0002] UV inkjet printing does not require screen making and can be used anytime, anywhere, meeting today's personalized needs for printed products. UV light cures instantly, and no additional drying and curing equipment is required, greatly improving efficiency. The printed coating has excellent performance, heat resistance, and weather resistance. With rapid development in the past 20 years, many products have switched from traditional printing to digital printing, and the entire market has continued to increase. Domestic equipment will explode in 2022, with annual sales exceeding the sum of the previous 10 years, and is still growing.

[0003] At present, the printing materials required for UV inkjet printing are uneven, and the compatibility with various UV inks is not wide, which has great limitations. A universal UV inkjet printing film is needed to solve the above compatibility problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a universal UV inkjet printing film.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0006] A UV inkjet printing film comprises a PET base film, wherein the upper and lower surfaces of the PET base film are respectively provided with a water-based functional pre-coating layer, and the mass percentage composition of the water-based functional pre-coating layer is as follows:

[0007] Biscyclopentenyloxyethyl acrylate acrylic polymer 60-80;

[0008] Waterborne polymer resin 19.5~39.5;

[0009] Water-based substrate wetting agent 0.1~0.5;

[0010] The sum of all the above components is 100%.

[0011] Furthermore, in the biscyclopentenyloxyethyl acrylate acrylic polymer, the biscyclopentenyloxyhexyl acrylate monomer accounts for 10% of the total monomer amount of the polymer.

[0012] Furthermore, the dry film thickness of the water-based functional pre-coating layer is 100 to 200 nm.

[0013] Furthermore, the water-based polymer resin is selected from one of the water-based polyester resin WB-900 and the water-based polyurethane resin WS-555, and the water-based substrate wetting agent is selected from the water-based substrate wetting agent acetylene glycol 440.

[0014] A method for preparing a UV inkjet printing film, the preparation method comprising the following steps:

[0015] S1 Preparation of water-based functional pre-coating glue: first add acrylic acid dicyclopentenyloxyethyl ester acrylic polymer, then add a certain proportion of water-based polymer resin and wetting agent, and add water-based cross-linking agent before coating to dilute to obtain water-based functional pre-coating glue, wherein the water-based cross-linking agent is carbodiimide SV-02;

[0016] S2 Preparation of UV inkjet printing film: The water-based functional pre-coating glue prepared in step S1 is coated on the PET base film and dried to obtain a UV inkjet printing film.

[0017] Since the UV inkjet printing film is double-sided coated, the glue should be designed to meet the double-sided coating process. Since the coating and drying time is very short, the water-based functional pre-coating glue should be designed to dry and roll up quickly.

[0018] The resolubility of water-based glue is also very important, otherwise it is easy to produce gel particles and coating defects in the continuous production process. The use of high-temperature cross-linked water-based polymer resin (the product of water-based cross-linking agent and main resin) greatly improves the strength and anti-adhesion of the adhesive film. Precision micro-concave coating accurately controls the thickness of the adhesive layer to avoid inconsistent performance and rainbow patterns caused by uneven adhesive layer thickness.

[0019] Furthermore, the solid content of the water-based functional pre-coating glue obtained after dilution with water in step S1 is 2%.

[0020] The acrylic polymer containing biscyclopentenyloxyethyl acrylate and other types of water-based polymer resins used in the present invention have a solid content of 2%, dry quickly, and have good adhesion to PET. In order to prevent adhesion during the coating and drying process, the functional polymers and other types of water-based polymer resins used for UV inkjet printing film glue must dry quickly, otherwise they are easy to stick to the roller.

[0021] Furthermore, the step S1 also includes filtering to remove foreign particles and foam before coating.

[0022] When coating, the water-based glue is required to be bubble-free or low-foam and have good viscosity stability, otherwise it will affect the apparent quality of the UV inkjet printing film.

[0023] Furthermore, the amount of the water-based crosslinking agent added in step S2 is 2-5% of the mass of the dicyclopentenyloxyethyl acrylate acrylic polymer and the water-based polymer resin.

[0024] Furthermore, in step S2, the drying temperature is 160-170° C., and the dry film thickness of the adhesive layer is 100-200 nm.

[0025] Furthermore, in step S2, the water-based functional pre-coating glue is applied in a micro-concave coating manner.

[0026] The beneficial effects of the technical solution of the present invention are:

[0027] The invention adopts heat-resistant PET as a base film, and coats a functional pre-coating layer on both sides of the surface of the film. The water-based pre-coating layer contains dicyclopentenyloxyethyl acrylate, and the cyclopentenyl group realizes integrated solidification with the upper inkjet UV ink, instead of adjusting the polarity of the composite pre-coating water-based polymer resin to achieve similar compatibility with the upper UV ink. Therefore, the printing film can achieve compatibility with inks from different manufacturers, eliminating the inconvenience of use.

[0028] The functional water-based polymer containing dicyclopentenyloxyethyl acrylate is structurally designed and monomers are added in two steps. The mixed monomers in the first half do not contain dicyclopentenyloxyethyl acrylate, and dicyclopentenyloxyethyl acrylate monomers are added to the mixed monomers in the second half of emulsion polymerization, so that the monomers are located in the shell layer of the core-shell structure emulsion particles to improve the reactivity with UV ink. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the model curing mechanism of the waterborne polymer in the present invention.

[0030] In the figure: 1 PET film, 2 water-based functional pre-coating layer, 3 UV ink layer. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with specific implementations and accompanying drawings.

[0032] The UV inkjet printing film of the present invention comprises a PET base film 1, and a water-based functional pre-coating layer 2 is provided on the surface of the PET base film 1, wherein the mass percentage composition of the water-based functional pre-coating layer 2 is as follows:

[0033] Biscyclopentenyloxyethyl acrylate acrylic polymer 60-80;

[0034] Waterborne polymer resin 19.5~39.5;

[0035] Water-based substrate wetting agent 0.1~0.5;

[0036] The sum of all the above components is 100%;

[0037] The dicyclopentenyloxyhexyl acrylate monomer accounts for 10% of the total monomer amount of the polymer.

[0038] The functional waterborne polymer containing dicyclopentenyloxyethyl acrylate in the present invention is as follows: Figure 1 As shown in the figure, through structural design, the biscyclopentenyloxyethyl acrylate component is placed on the particle surface as much as possible to improve the reactivity with UV ink. The red part represents the biscyclopentenyloxyethyl acrylate component, and the blue part is the main chain of the acrylic resin.

[0039] As shown in the figure, the method for preparing the UV inkjet printing film of the present invention comprises the following steps:

[0040] S1 Preparation of water-based functional pre-coating glue: first add acrylic acid dicyclopentenyloxyethyl ester acrylic polymer, then add a certain proportion of water-based polymer resin and wetting agent, and before coating, add water-based cross-linking agent carbodiimide SV-02 and dilute to obtain water-based functional pre-coating glue;

[0041] S2 Preparation of UV inkjet printing film: The water-based functional pre-coating glue prepared in step S1 is coated on the PET base film and dried to obtain a UV inkjet printing film.

[0042] Since the UV inkjet printing film is double-sided coated, the glue should be designed to meet the double-sided coating process. Since the coating and drying time is very short, the water-based functional pre-coating glue should be designed to dry and roll up quickly.

[0043] The resolubility of water-based glue is also very important, otherwise it is easy to produce gel particles and coating defects in the continuous production process. The use of high-temperature cross-linked water-based polymer resin greatly improves the strength and anti-adhesion of the film. Precision micro-concave coating accurately controls the thickness of the glue layer to avoid inconsistent performance and rainbow patterns caused by uneven glue layer thickness.

[0044] Example 1

[0045] Water-based polyester resin WS-250 99.5

[0046] Water-based substrate wetting agent acetylenediol 440 0.5

[0047] The sum of all the above components equals 100%

[0048] Preparation method:

[0049] S1 first adds water-based polymer resin, then adds water-based substrate wetting agent, and filters to remove impurity particles and foam. Before coating, add 2-5% water-based crosslinking agent with a mass fraction of water-based polymer resin, dilute with water to a coating viscosity of about 11 seconds (coating 4 cups), and then obtain water-based functional pre-coating glue.

[0050] S2 dilutes the prepared water-based functional pre-coating glue with water to 2% solid content, and applies it on a 250μm corona-treated PET film with a 10μ wire rod, puts it in an oven at 170℃ to dry for 60 seconds, and then cools it to room temperature for performance testing.

[0051] The results of inkjet printing the UV inkjet ink layer 3 and performing performance tests on the PET pre-coated film prepared in the above example are as follows:

[0052]

[0053] Example 2

[0054] Waterborne polyurethane resin WS-555 99.5

[0055] Water-based substrate wetting agent acetylenediol 440 0.5

[0056] The sum of all the above components equals 100%.

[0057] Preparation method

[0058] S1 first adds water-based polymer resin, then adds water-based substrate wetting agent, and filters to remove impurity particles and foam. Before coating, add 2-5% water-based crosslinking agent carbodiimide SV-02 with water-based polymer resin mass fraction, dilute with water to the coating viscosity of about 11 seconds (coat 4 cups), and then obtain water-based functional pre-coating glue.

[0059] S2 dilutes the prepared water-based functional pre-coating glue with water to 2% solid content, and applies it on a 250μm corona-treated PET film with a 10μ wire rod, puts it in an oven at 170℃ to dry for 60 seconds, and then cools it to room temperature for performance testing.

[0060] The results of the performance test of the PET pre-coated film prepared in the above example are as follows:

[0061]

[0062] Example 3

[0063] Contains biscyclopentenyloxyethyl acrylate acrylic polymer 80

[0064] Water-based polyester resin WB-900 19.5

[0065] Water-based substrate wetting agent acetylenediol 440 0.5

[0066] The sum of all the above components equals 100%

[0067] Preparation method:

[0068] S1 first adds acrylic acid polymer containing dicyclopentenyloxyethyl acrylate and other types of water-based polymer resins, then adds water-based substrate wetting agent, and filters to remove foreign particles and foam. Before coating, add 2-5% of the mass fraction of hydrophilic polymer and other types of water-based polymer resins, and add water-based crosslinking agent carbodiimide SV-02, and dilute with water to a coating viscosity of about 11 seconds (coating 4 cups), and then obtain water-based functional pre-coating glue.

[0069] S2 dilutes the prepared water-based functional pre-coating glue with water to 2% solid content, and applies it on a 250μm corona-treated PET film with a 10μ wire rod, puts it in an oven at 170℃ to dry for 60 seconds, and then cools it to room temperature for performance testing.

[0070] The results of the performance test of the PET pre-coated film prepared in the above example are as follows:

[0071]

[0072]

[0073] Example 4

[0074] Contains biscyclopentenyloxyethyl acrylate acrylic polymer 20

[0075] Water-based acrylic polymer resin S-1040 79.5

[0076] Water-based substrate wetting agent acetylenediol 440 0.5

[0077] The sum of all the above components equals 100%.

[0078] Preparation method

[0079] S1 first adds acrylic acid polymer containing dicyclopentenyloxyethyl acrylate and other types of water-based polymer resins, then adds water-based substrate wetting agent, and filters to remove foreign particles and foam. Before coating, add 2-5% of the mass fraction of hydrophilic polymer and other types of water-based polymer resins, and add water-based crosslinking agent carbodiimide SV-02, and dilute with water to a coating viscosity of about 11 seconds (coating 4 cups), and then obtain water-based functional pre-coating glue.

[0080] S2 dilutes the prepared water-based functional pre-coating glue with water to 2% solid content, and applies it on a 250μm corona-treated PET film with a 10μ wire rod, puts it in an oven at 170℃ to dry for 60 seconds, and then cools it to room temperature for performance testing.

[0081] The results of the performance test of the PET pre-coated film prepared in the above example are as follows:

[0082]

[0083] Example 5

[0084] Contains biscyclopentenyloxyethyl acrylate acrylic polymer 60

[0085] Waterborne polyurethane resin WS-555 39.5

[0086] Water-based substrate wetting agent acetylenediol 440 0.5

[0087] The sum of all the above components equals 100%

[0088] Preparation method:

[0089] S1 first adds acrylic acid polymer containing dicyclopentenyloxyethyl acrylate and other types of water-based polymer resins, then adds water-based substrate wetting agent, and filters to remove foreign particles and foam. Before coating, add 2-5% of the mass fraction of hydrophilic polymer and other types of water-based polymer resins, and add water-based crosslinking agent carbodiimide SV-02, and dilute with water to a coating viscosity of about 11 seconds (coating 4 cups), and then obtain water-based functional pre-coating glue.

[0090] S2 dilutes the prepared water-based functional pre-coating glue with water to 2% solid content, and applies it on a 250μm corona-treated PET film with a 10μ wire rod, puts it in an oven at 170℃ to dry for 60 seconds, and then cools it to room temperature for performance testing.

[0091] The results of the performance test of the PET pre-coated film prepared in the above example are as follows:

[0092]

[0093]

[0094] Example 6

[0095] Contains biscyclopentenyloxyethyl acrylate acrylic polymer 70

[0096] Water-based polyester resin WB-900 29.5

[0097] Water-based substrate wetting agent acetylenediol 440 0.5

[0098] The sum of all the above components equals 100%.

[0099] Preparation method:

[0100] S1 first adds acrylic acid polymer containing dicyclopentenyloxyethyl acrylate and other types of water-based polymer resins, then adds water-based substrate wetting agent, and filters to remove foreign particles and foam. Before coating, add 2-5% of the mass fraction of hydrophilic polymer and other types of water-based polymer resins, and add water-based crosslinking agent carbodiimide SV-02, and dilute with water to a coating viscosity of about 11 seconds (coating 4 cups), and then obtain water-based functional pre-coating glue.

[0101] S2 dilutes the prepared water-based functional pre-coating glue with water to 2% solid content, and applies it on a 250μm corona-treated PET film with a 10μ wire rod, puts it in an oven at 170℃ to dry for 60 seconds, and then cools it to room temperature for performance testing.

[0102] The results of the performance test of the PET pre-coated film prepared in the above example are as follows:

[0103]

[0104]

[0105] From the test results of the above examples, it can be seen that, in the case of the ratio of the fixed resin to the acrylic polymer containing biscyclopentenyloxyethyl acrylate, the layer adhesion of Example 1, Example 2, and Example 4 to the UV inkjet ink is not good, while the layer adhesion of Example 3, Example 5, and Example 6 to the UV inkjet ink is good. The pre-coating layer obtained by using water-based polyester with acrylic polymer containing biscyclopentenyloxyethyl acrylate has a higher dyne value. It is conducive to the wetting of the ink and the pattern color is better.

[0106] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary experimental examples, and that the present invention can be implemented in other specific forms without departing from the spirit and essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended 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, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0107] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent claim scheme. This narrative method 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 can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A UV inkjet printing film, characterized in that: It comprises a PET base film, wherein the upper and lower surfaces of the PET base film are respectively provided with a water-based functional pre-coating layer, and the mass percentage composition of the water-based functional pre-coating layer is as follows: Biscyclopentenyloxyethyl acrylate acrylic polymer 60~80; Waterborne polymer resin 19.5~39.5; Water-based substrate wetting agent 0.1~0.5; The sum of all the above components is 100%; The dicyclopentenyloxyethyl acrylate monomer in the dicyclopentenyloxyethyl acrylate acrylic polymer accounts for 10% of the total monomer amount of the polymer; The biscyclopentenyloxyethyl acrylate acrylic polymer is a core-shell structure, and the biscyclopentenyloxyethyl acrylate monomer is located in the shell layer of the core-shell structure latex particles.

2. The UV inkjet printing film according to claim 1, characterized in that: The dry film thickness of the water-based functional pre-coating layer is 100-200 nm.

3. The UV inkjet printing film according to claim 1, characterized in that: The water-based polymer resin is selected from one of water-based polyester resin WB-900 and water-based polyurethane resin WS-555, and the water-based substrate wetting agent is selected from water-based substrate wetting agent acetylene glycol 440.

4. A method for preparing a UV inkjet printing film according to any one of claims 1 to 3, characterized in that: The preparation method comprises the following steps: S1 Preparation of water-based functional pre-coating glue: firstly, add acrylic acid polymer containing dicyclopentenyloxyethyl acrylate, then add a certain proportion of water-based polymer resin and wetting agent, and before coating, add water-based cross-linking agent to dilute and obtain water-based functional pre-coating glue; S2 Preparation of UV inkjet printing film: The water-based functional pre-coating glue prepared in step S1 is coated on the PET base film and dried to obtain a UV inkjet printing film.

5. The method for preparing a UV inkjet printing film according to claim 4, characterized in that: The solid content of the water-based functional pre-coating glue obtained after dilution with the aqueous cross-linking agent in step S1 is 2%.

6. The method for preparing a UV inkjet printing film according to claim 4, characterized in that: The step S1 also includes filtering to remove foreign particles and foam before coating.

7. The method for preparing a UV inkjet printing film according to claim 4, characterized in that: In the step S1, the water-based crosslinking agent is carbodiimide SV-02, and the added amount thereof is 2-5% of the mass of the dicyclopentenyloxyethyl acrylate acrylic acid polymer and the water-based polymer resin.

8. The method for preparing a UV inkjet printing film according to claim 4, characterized in that: In step S2, the drying temperature is 160-170° C., and the dry film thickness of the adhesive layer is 100-200 nm.

9. The method for preparing a UV inkjet printing film according to claim 4, characterized in that: In step S2, the water-based functional pre-coating glue is coated in a micro-concave coating manner.

Images