UV touch ink and preparation method thereof

Abstract

The invention relates to the technical field of ink, and particularly provides UV touch ink and a preparation method thereof.The UV touch ink is prepared from, by weight, 30-50 parts of dicyclopentadiene acrylate monomer, 40-60 parts of UV-cured acrylate resin, 3-5 parts of photoinitiator, 0.1-0.5 part of organic wax, 5-10 parts of solvent and 0.1-0.3 part of flatting agent; the dicyclopentadiene acrylate monomer is adopted as a core active component, and the comprehensive performance of the UV touch ink is remarkably improved by combining the synergistic effect of the urethane acrylate resin and the efficient photoinitiator.

Description

Technical Field

[0001] The invention relates to the field of inks, and in particular to a UV tactile ink and a preparation method thereof. Background Art

[0002] As a core functional material in the fields of printed electronics, smart packaging, high-end consumer products, etc., the technological development of tactile inks has always revolved around the balance between tactile feedback performance, environmental protection and durability.

[0003] The current mainstream technology has the following limitations: Existing tactile inks mostly rely on microsphere particles or foaming agents to achieve surface texture control. For example, microspheres form a fixed concave-convex structure during the curing process, but there are problems such as single touch and poor wear resistance. Although nanomaterials (such as carbon nanotubes and nanocellulose) have potential in improving the fineness of ink touch and functional integration, their agglomeration problem seriously restricts practical applications. For example, directly adding unmodified carboxymethyl cellulose to ink will result in uneven dispersion and mottled defects on the printed surface. Existing dispersion processes (such as homogenizer grinding) have high energy consumption and are easy to damage the nanostructure.

[0004] How to solve the above technical problems and provide a new UV tactile ink technical solution has become one of the technical problems that need to be solved urgently. Summary of the invention

[0005] In view of this, the present invention proposes a carboxymethyl nanocellulose-enhanced UV tactile ink and a preparation method thereof.

[0006] The technical solution of the present invention is implemented as follows: The present invention provides a UV tactile ink, which includes, by weight: 30-50 parts of dicyclopentadienyl acrylate monomer, 40-60 parts of UV curing acrylate resin, 3-5 parts of photoinitiator, 0.1-0.5 parts of organic wax, 5-10 parts of solvent, and 0.1-0.3 parts of leveling agent.

[0007] In some embodiments, the viscosity of the dicyclopentadienyl acrylate monomer is 7-25 mPa•s (25° C.), and the glass transition temperature (Tg) is ≥80° C.

[0008] In some embodiments, the photoinitiator is selected from at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

[0009] In some embodiments, the organic wax is polypropylene wax with a particle size of 1-5 μm and a melting point of ≥140°C.

[0010] In some embodiments, the solvent is a mixed solvent of ethyl acetate and isopropanol, and the mass ratio of ethyl acetate to isopropanol is (1-3):1.

[0011] In some embodiments, the leveling agent is a fluorocarbon-modified polyacrylate.

[0012] In some embodiments, the UV-curable acrylate resin is polyurethane acrylate with a functionality of 2 - 3.

[0013] In some embodiments, the tactile roughness (Ra) of the UV tactile ink is ≤ 1.5 μm, and the number of alcohol wiping resistance is ≥ 300 times.

[0014] The second aspect of the present invention also provides a method for preparing the above-mentioned UV tactile ink, including: Mix dicyclopentadienyl acrylate monomer, UV-curable acrylate resin, photoinitiator and solvent, stir and disperse under light-shielded conditions, the stirring speed is 800 - 1200 rpm, the dispersion temperature is 30 - 40 °C, add organic wax and leveling agent and continue to disperse, the stirring speed is 2000 rpm, the stirring time is 10 - 15 min, and obtain the product after filtration.

[0015] In some embodiments, the stirring and dispersion adopt a low-pressure ultrasonic dispersion process with a frequency of 40 kHz, a power of 200 W, and a time of 30 - 40 minutes.

[0016] The present invention has the following beneficial effects compared with the prior art: By using dicyclopentadienyl acrylate monomer as the core active ingredient and combining the synergistic effect of polyurethane acrylate resin and high-efficiency photoinitiator, the present invention significantly improves the comprehensive performance of the UV tactile ink: the low viscosity and high glass transition temperature of dicyclopentadienyl acrylate monomer endow the ink with a delicate touch and excellent wear resistance. At the same time, through the cooperation of ethyl acetate / isopropyl alcohol mixed solvent and fluorocarbon-modified leveling agent, the environmental protection performance of low VOC emission is achieved, and the printing orange peel defect is eliminated; the low-pressure ultrasonic dispersion process (40 kHz, 200 W) combined with the uniform dispersion of polypropylene wax reduces the energy consumption by 50% while protecting the integrity of the nanostructure, meeting the industrial requirements of intelligent packaging and high-end printing. Specific Embodiments

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the embodiments of the present invention belong. If the definitions stated in this section are contrary to or otherwise inconsistent with the definitions stated in the patents, patent applications, published patent applications, and other publications incorporated herein by reference, the definitions listed in this section shall prevail over the definitions incorporated herein by reference.

[0019] Unless otherwise specified, the methods used in the following examples are all conventional methods. The materials, reagents, and instruments used, unless otherwise specified, are all conventional materials, reagents, and instruments in this field, and those skilled in the art can obtain them through commercial channels.

[0020] When an equivalent, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values and lower preferred values, it should be understood that all ranges formed by any pairing of any upper range limit or preferred value with any lower range limit or preferred value are specifically disclosed, regardless of whether these ranges are separately disclosed or not. For example, when the range "1 to 5" is disclosed, the described range should be interpreted as including the ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described herein, unless otherwise stated, this range is intended to include its end values and all integers and fractions within the range. In the specification and claims of this application, range limitations can be combined and / or interchanged, and if not otherwise stated, these ranges include all sub-ranges contained therein.

[0021] Example 1 Synergistic Optimization of DCPD Monomer and Resin Formulation (parts by weight): Dicyclopentadienyl acrylate monomer (DCPD, viscosity 15 mPa·s, Tg≥80°C) 45 parts Polyurethane acrylate resin (functionality 2, Sartomer CN2300) 50 parts Photoinitiator (2,4,6-trimethylbenzoyl-diphenylphosphine oxide, TPO) 4 parts Polypropylene wax (Honeywell A-C 6, particle size 2 μm) 0.3 parts Mixed solvent (ethyl acetate:isopropanol = 2:1) 8 parts Fluorocarbon-modified leveling agent (BYK-333) 0.2 parts Preparation steps: Pre-mixing: The DCPD monomer and the resin are stirred at 35°C at 800 rpm for 10 minutes.

[0022] Photoinitiator dispersion: Add TPO and disperse under low-pressure ultrasonic (40 kHz, 200 W, 35 minutes).

[0023] Solvent and wax dispersion: Add solvent and polypropylene wax and stir at 1200 rpm for 15 minutes.

[0024] Leveling agent final mixing: Add leveling agent and disperse by microfluidic shearing (rate ≥ 10^4 s -1 ) for 10 minutes.

[0025] Filtration: Filter through a 300-mesh sieve and control the viscosity at 200 ± 20 mPa·s (coat-4 cup, 25°C).

[0026] Performance testing: Tactile roughness Ra: 1.2 μm (ISO 4287) Alcohol rubbing resistance: ≥ 350 times (ASTM D5264) VOC emission: 42 g / L (HJ 371-2018) Example 2 Optimization of photoinitiator and solvent Formulation adjustment: Based on Example 1, replace the photoinitiator with 3 parts of phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (Type 819) Adjust the solvent to ethyl acetate:isopropanol = 3:1, with a total solvent of 5 parts Preparation method: The same as Example 1, but shorten the ultrasonic dispersion time to 30 minutes.

[0027] Performance improvement: Curing speed: 0.5 second (UV-LED 120W / cm) VOC emission: 38 g / L (9.5% lower than Example 1) Example 3 High-functional resin and nano-enhancement Formulation adjustment: Based on Example 1, 55 parts of polyurethane acrylate resin (functionality 3, Sartomer CN3100) Add 2 parts of fumed silica (Aerosil 200, 10 nm) Preparation steps: Pre-grind silica and resin (three-roll grinder, fineness ≤ 5 μm).

[0028] The remaining steps are the same as Example 1.

[0029] Performance improvement: Adhesion: 5B (ASTM D3359) Alcohol wipe resistance: ≥500 times (42.8% improvement compared to Example 1).

[0030] Comparative Example 1 Replacement of DCPD with traditional monomer (TPGDA) Formulation adjustment: Based on Example 1, 45 parts of DCPD were replaced with TPGDA (tripropylene glycol diacrylate). Performance defects: Touch surface roughness Ra: 2.8 μm (exceeding the claim limit). Alcohol wipe resistance: 150 times (only 42.8% of Example 1). Comparative Example 2 Homogenizer dispersion process Preparation adjustment: Based on Example 1, low-pressure ultrasonic was replaced with homogenizer grinding (energy consumption 1.2 kWh / kg). Performance defects: Agglomeration rate of polypropylene wax: >50% (observed by TEM). Touch uniformity: mottled defects appeared on the surface Comparative Example 3 Dispersion of unmodified nanocellulose Formulation adjustment: Based on Example 1, 45 parts of DCPD were replaced with unmodified carboxymethyl cellulose Performance defects: Dispersion particle size D50: 500 nm (100 nm in Example 1). Printing surface: mottled defect rate >30%.

[0031] The UV touch inks prepared from the above examples and comparative examples were subjected to performance tests, and the results are shown in the following table:

[0032] The examples were optimized by dicyclopentadienyl acrylate monomer, low-pressure ultrasonic dispersion process and high-functional resin, and the comprehensive performance was significantly better than that of the comparative examples. Due to material substitution or process defects, the comparative examples showed deficiencies in key indicators such as touch, adhesion and environmental protection. Specific data can be referred to the experimental verification part of the patent examples and comparative examples.

[0033] Example 4 Low-viscosity DCPD Based on Example 1, the viscosity of the DCPD monomer used was 7 mPa·s, and other conditions remained unchanged.

[0034] Example 5 High-viscosity DCPD On the basis of Example 1, the viscosity of the DCPD monomer used is 25 mPa·s, and other conditions remain unchanged.

[0035] Comparative Example 4 Traditional DCPD On the basis of Example 1, the viscosity of the DCPD monomer used is 30 mPa·s, and other conditions remain unchanged.

[0036] Comparative Example 5 Unmodified high-viscosity resin On the basis of Example 1, the DCPD monomer is omitted, and other conditions remain unchanged.

[0037] Perform performance tests on the above Examples 4-5 and Comparative Examples 4-5, and obtain the results shown in the following table:

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A UV tactile ink, characterized in that, Calculated by weight parts, it includes: 30-50 parts of dicyclopentadienyl acrylate monomer, 40-60 parts of UV-curable acrylate resin, 3-5 parts of photoinitiator, 0.1-0.5 part of organic wax, 5-10 parts of solvent, and 0.1-0.3 part of leveling agent.

2. The UV tactile ink according to claim 1, wherein The viscosity of the dicyclopentadienyl acrylate monomer is 7-25 mPa·s (25 °C), and the glass transition temperature (Tg) ≥ 80 °C.

3. The UV tactile ink according to claim 1, characterized in that, The photoinitiator is selected from at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide.

4. The UV tactile ink according to claim 1, wherein The organic wax is polypropylene wax, with a particle size of 1-5 μm and a melting point ≥ 140 °C.

5. The UV tactile ink according to claim 1, wherein The solvent is a mixed solvent of ethyl acetate and isopropyl alcohol, and the mass ratio of ethyl acetate to isopropyl alcohol is (1-3):

1.

6. The UV tactile ink according to claim 1, characterized in that, The leveling agent is fluorocarbon-modified polyacrylate.

7. The UV tactile ink according to claim 1, wherein The UV-curable acrylate resin is polyurethane acrylate, with a functionality of 2-3.

8. The UV tactile ink according to claim 1, wherein The tactile roughness (Ra) of the UV tactile ink ≤ 1.5 μm, and the number of times of alcohol wiping resistance ≥ 300 times.

9. A method for preparing the UV tactile ink according to any one of claims 1-8, characterized in that, It includes the following steps: Mix the dicyclopentadienyl acrylate monomer, UV-curable acrylate resin, photoinitiator and solvent, stir and disperse under dark conditions, the stirring speed is 800-1200 rpm, the dispersion temperature is 30-40 °C, add the organic wax and leveling agent and continue to disperse, the stirring speed is 2000 rpm, the stirring time is 10-15 min, and obtain it after filtration.

10. The preparation method according to claim 9, wherein The stirring and dispersion adopts a low-pressure ultrasonic dispersion process, with a frequency of 40 kHz, a power of 200 W, and a time of 30-40 minutes.

Images