Ultraviolet-resistant ink and preparation method thereof

Abstract

The invention discloses ultraviolet-resistant ink and a preparation method thereof, and belongs to the technical field of ink. The ink comprises 30-40% of hydroxyl modified water-based acrylic resin, 8-12% of a nano-composite light stabilizer, 5-8% of a functional aid and the balance of a solvent. The nano-composite light stabilizer comprises sulfydryl modified attapulgite loaded zinc oxide-titanium dioxide, and is prepared by high-speed dispersion, ultrasonic treatment and LED-UV / moisture dual curing. The ink has the advantages of high ultraviolet absorptivity, artificial aging resistance, adhesion of 5B level, excellent ultraviolet resistance and stability, suitability for base materials such as plastics and metals, and easiness in industrialization of the preparation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ink, and particularly discloses a kind of ultraviolet light resistant ink and a preparation method thereof. BACKGROUND

[0002] The ink is coated on the surface of a material, and mainly relies on the resin molecules to form a protective film. However, the ultraviolet light in sunlight has high energy, which can easily break the chemical bonds of the resin molecules, resulting in problems such as brittleness, cracking, discoloration and decreased adhesion on the surface of the ink.

[0003] The traditional method for improving the ultraviolet resistance of ink is to directly add a single ultraviolet absorber, but there are the following shortcomings: first, these powder particles are prone to agglomeration, only the surface particles can play a protective role, and the protection efficiency is low; second, a single material can only absorb a certain range of ultraviolet light, and cannot block it comprehensively, and it will still be damaged by ultraviolet light after a long time. Therefore, it is of great significance to develop an ink with excellent ultraviolet resistance. SUMMARY

[0004] In view of this, the present application provides a kind of ultraviolet light resistant ink and a preparation method thereof, to solve the problem of poor ultraviolet resistance of traditional ink, improve the aging resistance, discoloration resistance and adhesion retention capacity of the ink.

[0005] The technical scheme of the present application is as follows: the present application provides a kind of ultraviolet light resistant ink, by weight percentage, including the following components: water-based acrylic resin 30-40%, nano-composite light stabilizer 8-12%, functional additive 5-8% and the rest solvent; the nano-composite light stabilizer includes mercapto-modified attapulgite loaded zinc oxide-titanium dioxide 6-9%, hindered amine light stabilizer 1-2% and hindered phenol antioxidant 0.5-1.5%.

[0006] In some embodiments, the water-based acrylic resin is a hydroxyl-modified water-based acrylic resin, which can provide excellent adhesion and flexibility.

[0007] The hydroxyl content of the hydroxyl-modified water-based acrylic resin is 5.0%.

[0008] In some embodiments, in the mercapto-modified attapulgite loaded zinc oxide-titanium dioxide, the particle size of nano-zinc oxide is 20-30 nm, the titanium dioxide is P25 type and the rutile / anatase = (2.5-3.5):7, which can enhance the ultraviolet absorption and photocatalytic activity.

[0009] The preparation method of the mercapto-modified attapulgite loaded zinc oxide-titanium dioxide includes the following steps: Purification and activation of attapulgite: take attapulgite (particle size 100-200 mesh), soak in 5wt% hydrochloric acid solution for 2h, wash with deionized water until neutral, dry at 80℃ for 6h, remove impurities and activate surface hydroxyl.

[0010] Alkenyl introduction: add the pretreated attapulgite and p-phenylene diisocyanate (mass ratio 100:8) into the xylene solvent, stir at 60℃ for 2h under nitrogen protection, introduce alkenyl group (monitor by infrared spectroscopy 2270cm -1 peak isocyanate disappears, 3050cm -1 alkenyl peak appears).

[0011] Thiol grafting: add mercaptoethanol (excess, ensure complete reaction), click reaction at 60℃ for 3h (through thiol-alkenyl addition reaction), the product is washed with ethanol 3 times, vacuum dried at 60℃ for 4h, to obtain thiol modified attapulgite (thiol content 1.2±0.1mmol / g).

[0012] Zinc oxide-titanium dioxide loading: weigh the raw materials according to zinc nitrate:tetrabutyl titanate=1:1 (molar ratio), dissolve in ethanol-water mixture (volume ratio 1:1), the mass-volume ratio of raw materials to mixed solution is 1: (8-12) (g:mL), add thiol modified attapulgite (solid-liquid ratio 1:5), stir to form a suspension. Transfer the suspension to a hydrothermal reactor, react at 160℃ for 8h, centrifuge after cooling, dry at 60℃ for 5h, to obtain thiol modified attapulgite loaded zinc oxide-titanium dioxide (zinc oxide particle size 20-30nm, titanium dioxide rutile / anatase= (2.5-3.5):7).

[0013] In some embodiments, the hindered amine light stabilizer is a low molecular weight HALS (such as BASF Tinuvin®770), which can synergistically inhibit photooxidative degradation with nanomaterials; the hindered phenol antioxidant is Irganox®1010, which forms a synergistic antioxidant system with HALS.

[0014] In some embodiments, the functional additives include silane coupling agent 3-5% (KH-570, used to treat the surface of nanomaterials to improve compatibility with resins), wetting dispersant 1-2% (BYK-190, to ensure uniform dispersion of nanoparticles), and adhesion promoter 1-2% (polyester modified amine compound, to enhance adhesion to plastic and metal substrates).

[0015] In some embodiments, the solvent is a mixture of deionized water and propylene glycol methyl ether acetate, with a volume ratio of (2-4):1, which can adjust the ink viscosity to 20-30s (coating-4 cups, 25℃).

[0016] The application also provides a preparation method of the above-mentioned ultraviolet-resistant ink, comprising the following steps: (1) The attapulgite is reacted with p-phenylene diisocyanate to introduce alkenyl groups; then, through click chemistry, a mercapto-modified attapulgite is prepared; zinc nitrate, tetrabutyl titanate and the mercapto-modified attapulgite are reacted by a hydrothermal method to form a mercapto-modified attapulgite loaded zinc oxide-titanium dioxide; then, the same is mixed with a hindered amine light stabilizer and a hindered phenol antioxidant to obtain a nano-composite light stabilizer; (2) The water-based acrylic resin, the nano-composite light stabilizer prepared in step (1) and functional additives are added into a high-speed dispersion machine and pre-dispersed at a rotation speed of 1700-2300 rpm for 20-40 min; (3) The pre-dispersed mixture is transferred to an ultrasonic dispersion device and treated at a power of 400 W and a frequency of 40 kHz for 60 min; (4) A solvent is added to adjust the viscosity to 20-30 s, and the obtained product is filtered through a 5 μm filter to obtain the UV-resistant ink.

[0017] In some embodiments, in step (1), the temperature of the hydrothermal method is 145-175 ℃, and the time is 6-10 h.

[0018] In some embodiments, in step (2), the rotation speed of the high-speed dispersion machine is 2000 rpm, and the time is 30 min.

[0019] In some embodiments, the prepared UV-resistant ink is cured by using an LED-UV / humidity dual curing system, wherein the LED-UV curing uses a 365 nm wavelength LED light source, and the energy density is 200 mJ / cm 2 , to realize rapid surface curing; then, the humidity curing at room temperature is performed for 24 h, so that the residual isocyanate groups react with the moisture in the air to form a urea bond crosslinked structure, thereby improving the deep curing effect and water resistance.

[0020] Compared with the prior art, the present application has the following beneficial effects: (1) The nano-composite light stabilizer forms a "multi-layer protection", the mercapto-modified attapulgite acts as a porous carrier to uniformly disperse the zinc oxide and titanium dioxide nanoparticles without agglomeration, and each particle can work efficiently; the two kinds of nanoparticles absorb different wave bands of ultraviolet light, which can cover the full wave band of 280-400 nm and block comprehensively; the hindered amine light stabilizer and the hindered phenol antioxidant can neutralize the remaining energy, and the surface modification makes the composite structure have good compatibility with the resin, and the composite structure can stably work for a long time.

[0021] (2) By using a water-based resin system, through the treatment of a silane coupling agent and a dual curing technology, the adhesion of the ink on a PET film reaches level 5B (cross-hatch method), the color difference ΔE is less than 1.5 after artificial aging (QUV-A340 nm, 1000 h), and the performance is excellent.

[0022] (3) In the preparation process, ultrasonic dispersion is combined with hydrothermal method to realize uniform dispersion of nanomaterials in an aqueous system (dispersion index PDI < 0.2), which greatly improves the stability compared with traditional methods; and double solidification solves the problem of slow drying speed of the aqueous ink. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the application belong. If the definitions set forth in this section are contrary to or otherwise inconsistent with the definitions set forth in the patents, patent applications, published patent applications, and other publications that are herein incorporated by reference, the definitions set forth in this section prevail over the definitions that are incorporated herein by reference.

[0025] The methods used in the following examples are conventional unless otherwise stated. The materials, reagents and instruments used are conventional in the art unless otherwise stated, and are available to those skilled in the art through commercial channels.

[0026] When a range, preferably a range, or a range defined by a series of upper preferred values and lower preferred values of other values or parameters is expressed, it should be understood that all ranges formed by any pair of range upper limit or preferred value and any range lower limit or preferred value are specifically disclosed, regardless of whether the range is disclosed separately. For example, when the range "1 to 5" is disclosed, the described range should be interpreted as including the range "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, the range is intended to include its end values and all integers and fractions within the range. In the specification and claims of the present application, the range definitions can be combined and / or interchanged if not otherwise stated, and these ranges include all sub-ranges contained therein.

[0027] Preparation Example 1: The preparation method of the mercapto-modified palygorskite loaded zinc oxide-titanium dioxide includes the following steps: Palygorskite pretreatment: take palygorskite (particle size 150 mesh), soak in 5wt% hydrochloric acid solution for 2h, wash with deionized water until neutral, dry at 80℃ for 6h, remove impurities and activate surface hydroxyl groups.

[0028] Alkenyl introduction: 100 g of pretreated palygorskite and 8 g of p-phenylene diisocyanate (mass ratio 100:8) were added into xylene solvent, and stirred at 60 °C for 2 h under nitrogen protection to introduce alkenyl groups (monitored by infrared spectroscopy at 2270 cm -1 -1 disappeared, and an alkenyl peak appeared at 3050 cm -1 -1).

[0029] Thiol grafting: 50 g of mercaptoethanol (excess to ensure complete reaction) was added, and a click reaction was carried out at 60 °C for 3 h (through thiol-alkenyl addition reaction). The product was washed with ethanol for 3 times, and dried at 60 °C under vacuum for 4 h to obtain thiol-modified palygorskite (thiol content 1.2±0.1 mmol / g).

[0030] Zinc oxide-titania loading: raw materials were weighed according to zinc nitrate:tetrabutyl titanate = 1:1 (molar ratio), dissolved in an ethanol-water mixture (volume ratio 1:1), and the mass / volume ratio of the raw materials to the mixed solution was 1:10. Thiol-modified palygorskite was added (solid-liquid ratio 1:5) to form a suspension. The suspension was transferred to a hydrothermal reactor, and reacted at 160 °C for 8 h. After cooling, centrifugal separation was performed, and the product was dried at 60 °C for 5 h to obtain thiol-modified palygorskite loaded with zinc oxide-titania (zinc oxide particle size 20-30 nm, titania rutile / anatase = 3:7).

[0031] Preparation Example 2 Preparation steps: (1) The pretreatment of palygorskite, alkenyl introduction, and thiol grafting steps were the same as those in Preparation Example 1. (2) Zinc oxide loading: only zinc nitrate was weighed (without tetrabutyl titanate), dissolved in an ethanol-water mixture (volume ratio 1:1), and the mass / volume ratio of the zinc nitrate to the mixed solution was 1:10. Thiol-modified palygorskite was added (solid-liquid ratio 1:5) to form a suspension. The suspension was transferred to a hydrothermal reactor, and reacted at 160 °C for 8 h. After cooling, centrifugal separation was performed, and the product was dried at 60 °C for 5 h to obtain thiol-modified palygorskite loaded with zinc oxide (zinc oxide particle size 20-30 nm).

[0032] Preparation Example 3 Preparation steps: (1) The pretreatment of palygorskite, alkenyl introduction, and thiol grafting steps were the same as those in Preparation Example 1. (2) Ti02-loaded: Only tetrabutyl titanate (without zinc nitrate) was weighed, dissolved in ethanol-water mixture (volume ratio 1:1), the mass-volume ratio of tetrabutyl titanate to the mixed solution was 1:10, and the mercapto-modified palygorskite was added (solid-liquid ratio 1:5) to form a suspension by stirring. The suspension was transferred to a hydrothermal reactor, reacted at 160°C for 8h, centrifuged after cooling, dried at 60°C for 5h, and the mercapto-modified palygorskite loaded with Ti02(titanium dioxide rutile / anatase = 3:7, particle size 20-30 nm) was obtained.

[0033] Example 1 Formulation (weight percentage): Hydroxyl-modified water-based acrylic resin (Bayhydrol® A 2695): 35% Nano-composite light stabilizer: 10% (of which 8% is mercapto-modified palygorskite loaded with zinc oxide-titanium dioxide of Preparation Example 1, 1.5% is hindered amine light stabilizer Tinuvin® 770, and 0.5% is Irganox® 1010) Functional adjuvant: 6.5% (4% KH-570, 1.5% BYK-190, 1% polyester-modified amine adhesion promoter) Solvent: balance (deionized water: propylene glycol methyl ether acetate = 3:1, volume ratio) Preparation steps: (1) The mercapto-modified palygorskite loaded with zinc oxide-titanium dioxide obtained in Preparation Example 1 was mixed with Tinuvin® 770 and Irganox® 1010, and stirred for 30 min to obtain a nano-composite light stabilizer.

[0034] (2) The hydroxyl-modified water-based acrylic resin, nano-composite light stabilizer, and functional adjuvant were added to a high-speed dispersion machine and pre-dispersed at 2000 rpm for 30 min.

[0035] (3) It was transferred to an ultrasonic dispersion device and treated at a power of 400 W and a frequency of 40 kHz for 60 min.

[0036] (4) Solvent was added to adjust the viscosity to 25 s (4-cup, 25°C), and filtered through a 5 μm filter membrane to obtain the ink product.

[0037] (5) Curing: after curing under a 365 nm LED-UV light source (200 mJ / cm²), the sample was cured under humidity at room temperature (25°C) for 24 h.

[0038] Example 2 Formulation (weight percentage): Hydroxyl-modified water-based acrylic resin: 30%, (the proportions of the remaining components are the same as in Example 1, and the balance is water) Preparation process: Same as Example 1 (hydrothermal temperature 150°C, time 7h; high speed dispersion 1800rpm, 25min).

[0039] Example 3 Formulation (wt%): Nano-composite light stabilizer: 12% (of which supported nanomaterial 9%, Tinuvin®770 2%, Irganox®1010 1%, the rest same as Example 1) Preparation process: Hydrothermal temperature 170°C, time 9h; ultrasonic dispersion 70min.

[0040] Example 4 Formulation: Solvent is deionized water: propylene glycol methyl ether acetate = 2:1 (volume ratio), the rest same as Example 1.

[0041] Comparative Example 1 Formulation: Directly add 8% of zinc oxide-titanium dioxide mixed nanoparticles (zinc oxide: titanium dioxide = 1:1 (not supported on attapulgite), the rest same as Example 1.

[0042] Comparative Example 2 On the basis of Example 1, in the formulation: the mercapto-modified attapulgite supported zinc oxide-titanium dioxide is replaced by 8% of zinc oxide with a particle size of 20-30nm (without titanium dioxide and attapulgite), the rest same as Example 1.

[0043] Comparative Example 3 On the basis of Example 1, in the formulation: the mercapto-modified attapulgite supported zinc oxide-titanium dioxide is replaced by 8% of titanium dioxide with a particle size of 20-30nm (titanium dioxide rutile / anatase = 3:7, without zinc oxide and attapulgite), the rest same as Example 1.

[0044] Comparative Example 4 Formulation (wt%): Hydroxyl-modified water-based acrylic resin 35% Nano-composite light stabilizer 10% (of which supported zinc oxide of Preparation Example 2 8%, Tinuvin®770 1.5%, Irganox®1010 0.5%) Functional adjuvant 6.5% (same as Example 1) Solvent: balance (same as Example 1) Preparation process: Same as Example 1.

[0045] Comparative Example 5 Formulation (wt%): Hydroxyl-modified water-based acrylic resin 35% Nanocomposite light stabilizer 10% (including 8% of the loaded titanium dioxide of Preparation Example 3, 1.5% of Tinuvin® 770, and 0.5% of Irganox® 1010) Functional additive 6.5% (same as Example 1) Solvent: Balance (same as Example 1) Preparation process: same as Example 1.

[0046] The inks prepared in the above examples and comparative examples were used for performance testing. The samples were irradiated with a 365 nm LED-UV light source at 200 mJ / cm 2 After curing at room temperature and humidity at 25°C for 24 hours, the following tests were performed: 1. UV absorbance test Instrument: UV-visible spectrophotometer (Shimadzu UV-2600) Sample preparation: The ink was evenly coated on a quartz wafer (wet film thickness 50 μm) and cured to form a transparent film (dry film thickness 20 ± 2 μm).

[0047] Test steps: Using a blank quartz plate as a reference, scan the wavelength range of 280-400 nm and record the absorbance curve; Calculate the average absorbance of each band (280-320nm, 320-400nm, 280-400nm): Absorbance (%) = (1-transmittance) × 100%, where transmittance is directly read by the instrument.

[0048] 2. Artificial aging resistance test (QUV test) Instrument: QUV aging test chamber (Q-LabQUV / se) Sample preparation: The ink was coated on a PET substrate (dry film thickness 30 ± 5 μm) and cut into 100 mm × 100 mm specimens after curing.

[0049] Test conditions: Light source: UV-A 340nm lamp, irradiance 0.71W / m 2 ; Cycling conditions: 8 h of illumination (60°C) + 4 h of condensation (50°C), total duration 1000 h.

[0050] Evaluation indicators: Color difference ΔE: Use colorimeter (X-RiteCi7800) to test the L*, a*, and b values ​​of the samples before and after aging. According to the formula ΔE=√[(ΔL) 2 +(Δa*) 2 +(Δb*) 2 ]calculate; Gloss retention: The gloss of the ink before and after aging was tested by a gloss meter (60° angle), and the retention rate was calculated (gloss after aging / initial gloss x 100%).

[0051] 3. Adhesion test (crosshatch method) Standard: GB / T9286-1998 "Crosshatch test for paint films of pigmented coatings and varnishes" Instrument: Crosshatch tester (spacing 1 mm), soft brush, 3M600 tape.

[0052] Test steps: Draw 10x10 1 mm squares on the cured ink film with a crosshatch tester, to the substrate surface; 2 Gently brush along the diagonal of the grid with a soft brush 5 times to remove debris; Smoothly paste the tape on the grid with your fingers, and quickly tear it off at an angle of 45° after 5 minutes; Rating: 5B (no peeling), 4B (peeling area <5%), 3B (peeling area 5%-15%), and so on.

[0053] 4. Viscosity test (cup-4 method) Standard: GB / T1723-1993 "Paint viscosity determination method" Instrument: Cup-4 viscosity meter (4 mm aperture), stopwatch, constant temperature water bath (25±1℃).

[0054] Test steps: Place the ink sample in a 25℃ constant temperature water bath for 30 minutes; Wash and dry the cup-4, fix it on the support, fill it with ink, and scrape off the excess sample at the cup opening with a spatula; Loosen the cup bottom valve and start the stopwatch at the same time, record the time (s) when the ink stream breaks, test in triplicate and take the average value.

[0055] 5. Stability test (sedimentation observation) Instrument: 50 mL graduated cylinder with stopper, ruler.

[0056] Test steps: Pour the ink sample into the graduated cylinder to the 50 mL mark, seal and place it in a 25℃ constant temperature environment; Observe the sedimentation at 7 days, 15 days, and 30 days, measure the height of the supernatant (mm) with a ruler, and record the sedimentation height.

[0057] 6. Dispersion index (PDI) test Instrument: Laser particle size analyzer (Malvern Mastersizer 3000).

[0058] ​Test procedure: Take a small amount of ink sample, dilute with deionized water to the appropriate concentration (ensure that the laser obscuration rate is 10%-20%); Inject the particle size instrument sample pool, test the particle size distribution of the nanoparticles, and the instrument automatically calculates the PDI (PDI=(Dv90-Dv10) / Dv50, the smaller the value, the more uniform the dispersion).

[0059] The following table shows the results:

[0060] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A UV-resistant ink, characterized in that: The invention comprises the following components by weight percentage: 30-40% waterborne acrylic resin, 8-12% nano-composite light stabilizer, 5-8% functional additive and the balance solvent; the nano-composite light stabilizer comprises 6-9% mercapto-modified attapulgite-loaded zinc oxide-titanium dioxide, 1-2% hindered amine light stabilizer and 0.5-1.5% hindered phenol antioxidant; the preparation method of the mercapto-modified attapulgite-loaded zinc oxide-titanium dioxide comprises: Attapulgite pretreatment: Take 100-200 mesh attapulgite, soak it in 5wt% hydrochloric acid solution for 2 hours, wash it with deionized water until it is neutral, and dry it at 80℃ for 6 hours to remove impurities and activate surface hydroxyl groups; Introduction of alkenyl groups: pretreated attapulgite and p-phenylene diisocyanate were added to xylene solvent at a mass ratio of 100:8, and stirred at 60°C for 2 h under nitrogen protection to introduce alkenyl groups; Thiol grafting: add mercaptoethanol, conduct click reaction at 60℃ for 3h, wash the product with ethanol three times, and vacuum dry at 60℃ for 4h to obtain thiol-modified attapulgite; Loading zinc oxide-titanium dioxide: weigh the raw materials according to the molar ratio of zinc nitrate: tetrabutyl titanate of 1:1, dissolve them in an ethanol-water mixture with a volume ratio of 1:1, and the mass volume ratio of the raw materials to the mixed solution is 1:(8-12) (g:mL). Add mercapto-modified attapulgite according to the solid-liquid ratio of 1:5, and stir to form a suspension; transfer the suspension to a hydrothermal reactor, react at 160°C for 8 hours, cool and centrifuge, and dry at 60°C for 5 hours to obtain mercapto-modified attapulgite loaded zinc oxide-titanium dioxide.

2. The UV-resistant ink according to claim 1, wherein: The water-based acrylic resin is a hydroxyl-modified water-based acrylic resin.

3. The UV-resistant ink according to claim 1, wherein: In the mercapto-modified attapulgite-loaded zinc oxide-titanium dioxide, the particle size of nano zinc oxide is 20-30 nm, the titanium dioxide is P25 type, and the rutile / anatase ratio is (2.5-3.5):

7.

4. The UV-resistant ink according to claim 1, wherein: The hindered amine light stabilizer is Tinuvin® 770.

5. The UV-resistant ink according to claim 1, wherein: The hindered phenol antioxidant is Irganox® 1010.

6. The UV-resistant ink according to claim 1, wherein: The functional additives include 3-5% of a silane coupling agent, 1-2% of a wetting and dispersing agent, and 1-2% of an adhesion promoter; the silane coupling agent is KH-570, the wetting and dispersing agent is BYK-190, and the adhesion promoter is a polyester-modified amine compound.

7. The UV-resistant ink according to claim 1, wherein: The solvent is a mixture of deionized water and propylene glycol methyl ether acetate, and the volume ratio is (2-4):

1.

8. The method for preparing the UV-resistant ink according to any one of claims 1 to 7, characterized in that: The steps include: (1) Attapulgite is reacted with p-phenylene diisocyanate to introduce alkenyl groups; then, thiol groups are grafted onto the thiol-modified attapulgite by click chemistry; zinc nitrate and tetrabutyl titanate are reacted with the thiol-modified attapulgite by a hydrothermal method to form thiol-modified attapulgite-loaded zinc oxide-titanium dioxide; then, the thiol-modified attapulgite is mixed with a hindered amine light stabilizer and a hindered phenol antioxidant to obtain a nanocomposite light stabilizer; (2) Adding water-based acrylic resin, the nanocomposite light stabilizer prepared in step (1), and functional additives into a high-speed disperser, and pre-dispersing at a speed of 1700-2300 rpm for 20-40 minutes; (3) The pre-dispersed mixture was transferred to an ultrasonic dispersing device and treated at a power of 400 W and a frequency of 40 kHz for 60 minutes; (4) Add solvent to adjust the viscosity to 20-30s, and pass through a 5μm filter membrane to obtain UV-resistant ink.

9. The preparation method according to claim 8, wherein In step (1), the temperature of the hydrothermal method is 145-175°C and the time is 6-10 hours.

10. The preparation method according to claim 8, characterized in that In step (2), the speed of the high-speed disperser is 2000 rpm and the time is 30 min.

Images