A kind of rare earth long-lasting luminous luminous silk screen printing ink and preparation method thereof

Abstract

The present invention discloses a rare earth long-lasting luminous luminous silk screen ink and a preparation method thereof. The rare earth long-lasting luminous luminous silk screen ink comprises the following components in parts by weight: 40-60 parts of acrylic resin or polyester resin, 40-60 parts of rare earth doped strontium aluminate luminous powder, 1-2 parts of light stabilizer, 1-2 parts of ultraviolet absorber, 1-2 parts of anti-settling agent, 1-2 parts of leveling agent, and 1-2 parts of defoaming agent. The addition of rare earth doped strontium aluminate luminous powder in the technical solution of the present invention can make the silk screen ink emit luminescence at night. After applying it to a sign nameplate, the sign nameplate can emit luminescence for marking when there is no light at night, and the luminescence effect is obvious, the luminescence time is long, the service life is long, and the anti-aging performance is good.

Description

Technical Field

[0001] The invention relates to the technical field of inks, and in particular to a rare earth long-lasting luminous luminous silk screen printing ink and a preparation method thereof. Background Art

[0002] Signs and nameplates can be used for identification and identification, and are widely used in many areas of life, such as roads, buildings, parks, etc. However, currently, signs and nameplates can only be marked during the day, and cannot be marked at night when there is no light, which limits the application of signs and nameplates. Summary of the invention

[0003] The main purpose of the present invention is to provide a rare earth long-lasting luminous luminous silk screen printing ink and a preparation method thereof, aiming to solve the problem in the prior art that nameplates cannot be marked when there is no light at night.

[0004] To achieve the above-mentioned purpose, the present invention proposes a rare earth long-lasting luminous luminous silk screen printing ink, comprising the following components in parts by weight: 40 to 60 parts of acrylic resin or polyester resin, 40 to 60 parts of rare earth doped strontium aluminate luminous powder, 1 to 2 parts of light stabilizer, 1 to 2 parts of ultraviolet absorber, 1 to 2 parts of anti-settling agent, 1 to 2 parts of leveling agent, and 1 to 2 parts of defoaming agent.

[0005] Optionally, the acid value of the acrylic resin or polyester resin is less than ≤1 mgKOH / g.

[0006] Optionally, the particle size of the rare earth doped strontium aluminate luminescent powder is 3-6 μm.

[0007] Optionally, the rare earth element doped in the rare earth-doped strontium aluminate luminous powder is at least one of Eu and Dy.

[0008] Optionally, the light stabilizer includes a hindered amine light stabilizer; and / or the ultraviolet absorber includes a benzotriazole ultraviolet absorber.

[0009] Optionally, the anti-settling agent comprises fumed silica.

[0010] Optionally, the leveling agent includes an organosilicon leveling agent; and / or, the defoaming agent includes an organosilicon defoaming agent.

[0011] Another aspect of the present invention provides a method for preparing a rare earth long-lasting luminous luminous silk screen printing ink, comprising the following steps:

[0012] adding an anti-settling agent to an acrylic resin or a polyester resin, and stirring the mixture according to a first stirring condition to obtain a mixed solution;

[0013] Adding a light stabilizer, a UV absorber, a leveling agent and a defoamer into the mixed solution, and stirring according to the second stirring condition;

[0014] Rare earth-doped strontium aluminate luminescent powder is added, and stirring is performed according to the third stirring condition to obtain the rare earth long-lasting luminescent luminescent silk screen ink.

[0015] Optionally, the first stirring condition includes: stirring at a rotation speed of 100 to 200 rpm for 5 to 10 minutes, and then stirring at a rotation speed of 500 to 600 rpm for 15 minutes; and / or,

[0016] The second stirring condition includes: stirring at a speed of 400 to 500 rpm for 5 to 10 minutes; and / or,

[0017] The second stirring condition includes: stirring at a rotation speed of 200 to 300 rpm for 10 to 15 minutes.

[0018] On the other hand, the present invention provides an application of a rare earth long-lasting luminous luminous silk screen printing ink, wherein the rare earth long-lasting luminous luminous silk screen printing ink is printed on a sign plate by screen printing.

[0019] The technical solution of the present invention adds rare earth doped strontium aluminate luminescent powder to enable the screen printing ink to emit luminescence at night. After being applied to the nameplate, the nameplate can emit luminescence at night for marking when there is no light. The screen printing ink formula is optimized by adding light stabilizers, ultraviolet absorbers, anti-settling agents, leveling agents, and defoaming agents, so that the screen printing ink has the characteristics of obvious luminescence effect, long luminescence time, long service life, and good anti-aging performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 The effect diagram of the screen printing ink prepared in Example 1 being screen printed on a logo nameplate sample before and after QUV irradiation, wherein: Figure 1 (a) is a picture of the screen printing ink prepared in Example 1 before QUV after being screen printed on a logo nameplate sample. Figure 1 (b) is a picture of the screen printing ink prepared in Example 1 after being screen-printed on a logo nameplate sample after QUV;

[0022] Figure 2 This is a picture of the luminous effect of the screen printing ink prepared in Example 1 being screen printed on a logo nameplate sample before and after QUV irradiation. Figure 2 (a) is a picture showing the luminous effect of the screen printing ink prepared in Example 1 before QUV being screen printed on a logo nameplate sample. Figure 2 (b) is a picture of the luminous effect of the screen printing ink prepared in Example 1 printed on a logo nameplate sample after QUV;

[0023] Figure 3 The effect diagram of the screen printing ink prepared in Example 2 being screen printed on a logo nameplate sample before and after QUV irradiation is shown. Figure 3 (a) is a picture of the screen printing ink prepared in Example 2 before QUV after being screen printed on a logo nameplate sample. Figure 3 (b) is a picture of the screen printing ink prepared in Example 2 after being screen-printed on a logo nameplate sample after QUV;

[0024] Figure 4 This is a picture of the luminous effect of the screen printing ink prepared in Example 2 being screen printed on a logo nameplate sample before and after QUV irradiation. Figure 4 (a) is a picture showing the luminous effect of the screen printing ink prepared in Example 2 before QUV being screen printed on a logo nameplate sample. Figure 4 (b) is a picture of the luminous effect of the screen printing ink prepared in Example 2 printed on a logo nameplate sample after QUV. DETAILED DESCRIPTION

[0025] To make the purpose, technical scheme and advantages of the embodiment of the present invention clearer, the technical scheme in the embodiment of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiment, it is carried out according to the normal conditions or the conditions recommended by the manufacturer. If the reagents or instruments used do not specify the manufacturer, they are all conventional products that can be purchased commercially. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes, taking "A and / or B" as an example, including scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, the technical schemes between the various embodiments can be combined with each other, but must be based on the ability of ordinary technicians in the field to achieve. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of such technical solutions does not exist, and is not within the scope of protection required by the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present invention.

[0026] Signs and nameplates can be used for identification and identification, and are widely used in many areas of life, such as roads, buildings, parks, etc. However, currently, signs and nameplates can only be marked during the day, and cannot be marked at night when there is no light, which limits the application of signs and nameplates.

[0027] The ink used for signs and nameplates is usually zinc sulfide luminous powder, such as ZnS and Cu, which has the characteristics of "coming fast and going fast". "Coming fast" means that it is sensitive to light sources, and can be effectively stimulated by short-term and weak light sources, and quickly show the luminous effect; "going fast" means that the afterglow time is short, which cannot meet the long-term marking requirements of signs and nameplates in scenes such as roads, buildings, and parks.

[0028] In view of this, on the one hand, an embodiment of the present invention proposes a rare earth long-lasting luminous luminous silk screen ink, comprising the following components in parts by weight: 40 to 60 parts of acrylic resin or polyester resin, 40 to 60 parts of rare earth doped strontium aluminate luminous powder, 1 to 2 parts of light stabilizer, 1 to 2 parts of ultraviolet absorber, 1 to 2 parts of anti-settling agent, 1 to 2 parts of leveling agent, and 1 to 2 parts of defoaming agent.

[0029] The addition of rare earth doped strontium aluminate luminescent powder in the technical solution of the present invention can make the screen printing ink emit luminescence at night. After applying it to the nameplate, the nameplate can emit luminescence for marking when there is no light at night, that is, it can store energy during the day and emit light at night, and can emit luminous effect to display instructions without electricity, thus achieving the purpose of energy saving and preventing the uninterrupted provision of instructions during power outages. The screen printing ink formula is optimized by adding light stabilizers, ultraviolet absorbers, anti-settling agents, leveling agents, and defoaming agents, so that the screen printing ink has the characteristics of obvious luminescence effect, long luminescence time, long service life, and good anti-aging performance.

[0030] In some embodiments, the acid value of the acrylic resin or polyester resin is less than ≤1 mgKOH / g. The acid value of the acrylic resin or polyester resin is an indicator of the degree of resin reaction, and the acid value is defined as the number of milligrams of potassium hydroxide required to neutralize 1 g of resin. In the present invention, the acid value of the acrylic resin or polyester resin should be controlled to be less than ≤1 mgKOH / g. If the acid value of the acrylic resin or polyester resin is too high, the acrylic resin or polyester resin is prone to acidification reaction with the metal in the rare earth-doped strontium aluminate luminescent powder, thereby affecting the luminescent properties of the ink.

[0031] In some embodiments, the particle size of the rare earth doped strontium aluminate luminescent powder is 3-6 μm. The particle size of the rare earth doped strontium aluminate luminescent powder is controlled within the appropriate range, and screen blocking is not likely to occur during screen printing.

[0032] In some embodiments, the rare earth element doped in the rare earth doped strontium aluminate luminescent powder is at least one of Eu and Dy. The rare earth doped strontium aluminate luminescent powder has a long afterglow time and high luminous brightness. Suitable examples include but are not limited to: AS-993 long-lasting luminescent blue produced by Dongguan Chunliang Craft Materials Co., Ltd.

[0033] In some embodiments, the light stabilizer includes a hindered amine light stabilizer. The hindered amine light stabilizer has a hindered amine functional group, which belongs to the alicyclic amine structure and can be converted into a nitroxide free radical NO after absorbing light energy in an aerobic state. · These nitroxide radicals can not only capture the alkyl active radicals generated in the photo-oxidative degradation of polymer materials, but also have a regeneration function in the light stabilization process, thereby inhibiting the chain reaction to achieve the purpose of protection. Commonly used hindered amine (HALS) light stabilizers include 770, 622, 944, 783, 2020, 1130, etc. The ultraviolet absorber includes a benzotriazole ultraviolet absorber, and suitable examples include but are not limited to UV-326, UV-329, and UV-292.

[0034] In some embodiments, the anti-settling agent includes fumed silica. The anti-settling agent can prevent solid particles from settling, settling or separating out in the solution.

[0035] In some embodiments, the leveling agent includes an organosilicon leveling agent, and suitable examples include but are not limited to polydimethylsiloxane and polymethylphenylsiloxane. The defoaming agent includes an organosilicon defoaming agent, BYK-141 defoaming agent, BYK-065 defoaming agent, BYK-088 defoaming agent, and BYK-037 defoaming agent.

[0036] On the other hand, an embodiment of the present invention provides a method for preparing a rare earth long-lasting luminous luminous silk screen printing ink, comprising the following steps:

[0037] adding an anti-settling agent to an acrylic resin or a polyester resin, and stirring the mixture according to a first stirring condition to obtain a mixed solution;

[0038] Adding a light stabilizer, a UV absorber, a leveling agent and a defoamer into the mixed solution, and stirring according to the second stirring condition;

[0039] Rare earth-doped strontium aluminate luminescent powder is added, and stirring is performed according to the third stirring condition to obtain the rare earth long-lasting luminescent luminescent silk screen ink.

[0040] In the preparation method proposed by the present invention, the raw materials of each component are mixed and stirred in three steps to obtain a rare earth long-lasting luminous luminous silk screen printing ink. The preparation method of the present invention has simple steps and high preparation efficiency; in addition, the rare earth long-lasting luminous luminous silk screen printing ink prepared by the preparation method proposed by the present invention has all the beneficial effects of the above-mentioned rare earth long-lasting luminous luminous silk screen printing ink, which will not be described one by one here.

[0041] In some embodiments, the first stirring condition includes: stirring at a speed of 100 to 200 rpm for 5 to 10 minutes, and then stirring at a speed of 500 to 600 rpm for 15 minutes; the second stirring condition includes: stirring at a speed of 400 to 500 rpm for 5 to 10 minutes; the second stirring condition includes: stirring at a speed of 200 to 300 rpm for 10 to 15 minutes. The embodiment of the present invention controls the stirring conditions of each stirring step to make the materials mixed evenly, thereby avoiding uneven dispersion of materials or screen blocking during screen printing.

[0042] On the other hand, an embodiment of the present invention provides an application of a rare earth long-lasting luminous luminous silk-screen ink, wherein the rare earth long-lasting luminous luminous silk-screen ink is printed on a sign plate by screen printing.

[0043] The technical solution of the present invention is further described in detail below in conjunction with specific embodiments and drawings. It should be understood that the following embodiments are only used to explain the present invention and are not used to limit the present invention.

[0044] Example 1

[0045] This embodiment provides a method for preparing a rare earth long-lasting luminous silk screen printing ink and a rare earth long-lasting luminous silk screen printing ink prepared by the preparation method. The preparation method comprises:

[0046] a. Put 6 kg of acrylic resin (Japanese Mitsubishi Rayon resin, model MB-2952, represented by Shanghai Kaiyin Chemical Co., Ltd.) with an acid value of ≤1 mgKOH / g into a dispersion container, specifically using 50% MB-2952, 25% ethylene glycol diacetate, and 25% isophorone by mass fraction, stirring at a speed of 400-600 rpm for 1-2 hours until completely dissolved to obtain a resin solution with a mass fraction of 50%. Start stirring, add 0.2 kg of anti-settling agent fumed silica, slowly dissolve the anti-settling agent into the resin solution at a speed of 100 rpm, stir for 5 minutes, and after stirring evenly, switch to a high speed of 500 rpm and stir for 15 minutes until the fineness is ≤5um (micrometer) to obtain a mixed solution;

[0047] b. Add 0.1Kg of light stabilizer 770, 0.1Kg of UV absorber UV-326, 0.1Kg of leveling agent polydimethylsiloxane, and 0.1Kg of defoamer BYK-065 to the resulting solution, and slowly add the light stabilizer, UV absorber, leveling agent, and defoamer to the mixture at a speed of 400 rpm, and stir for 5 minutes until uniform;

[0048] c. Add 4 kg of rare earth-doped strontium aluminate luminescent powder with a particle size of 3 μm (manufacturer: Dongguan Chunliang Craft Materials Co., Ltd., model: AG-806 long-lasting luminescent green) to the above-obtained solution, slowly add the rare earth-doped strontium aluminate luminescent powder to the solution at a speed of 200 rpm, stir for 10 minutes until it is evenly stirred; obtain rare earth long-lasting luminescent luminescent silk-screen ink, the fineness of which is ≤5 μm.

[0049] Example 2

[0050] This embodiment provides a method for preparing a rare earth long-lasting luminous silk screen printing ink and a rare earth long-lasting luminous silk screen printing ink prepared by the preparation method. The preparation method comprises:

[0051] a. Put 4 kg of acrylic resin (manufacturer is Mitsubishi Rayon Resin of Japan, model MB-2952) with an acid value of ≤1 mgKOH / g into a dispersion container, specifically using 50% MB-2952, 25% ethylene glycol diacetate, and 25% isophorone by mass fraction, stirring at a speed of 400-600 rpm for 1-2 hours until completely dissolved, to obtain a resin solution with a mass fraction of 50%. Start stirring, add 0.1 kg of anti-settling agent fumed silica, slowly dissolve the anti-settling agent into the resin solution at a speed of 200 rpm, stir for 10 minutes, until it is evenly stirred, switch to a high speed of 600 rpm, stir for 15 minutes, until the fineness is ≤5um (micrometer), to obtain a mixed solution;

[0052] b. Add 0.1Kg of light stabilizer 770, 0.1Kg of UV absorber UV-326, 0.1Kg of leveling agent polydimethylsiloxane, and 0.1Kg of defoamer BYK-065 to the resulting solution, and slowly add the light stabilizer, UV absorber, leveling agent, and defoamer to the mixture at a speed of 500 rpm, and stir for 10 minutes until uniform;

[0053] c. Add 6 kg of rare earth-doped strontium aluminate luminescent powder with a particle size of 3 μm (manufacturer: Dongguan Chunliang Craft Materials Co., Ltd., model: AS-993 long-lasting luminescent blue) to the above-obtained solution, slowly add the rare earth-doped strontium aluminate luminescent powder to the solution at a speed of 300 rpm, stir for 15 minutes until it is evenly stirred; obtain a rare earth long-lasting luminescent luminescent silk-screen ink, the fineness of which is ≤5 μm.

[0054] Example 3

[0055] This embodiment provides a method for preparing a rare earth long-lasting luminous silk screen printing ink and a rare earth long-lasting luminous silk screen printing ink prepared by the preparation method. The preparation method comprises:

[0056] a. Put 5 kg of acrylic resin (manufacturer is Mitsubishi Rayon Resin of Japan, model number is MB-2952) with an acid value of ≤1 mgKOH / g into a dispersion container, specifically using 50% MB-2952, 25% ethylene glycol diacetate, and 25% isophorone by mass fraction, stirring at a speed of 400-600 rpm for 1-2 hours until completely dissolved, to obtain a resin solution with a mass fraction of 50%. Start stirring, add 0.15 kg of anti-settling agent fumed silica, slowly dissolve the anti-settling agent into the resin solution at a speed of 200 rpm, stir for 10 minutes, until it is evenly stirred, then switch to a high speed of 600 rpm, stir for 15 minutes, until the fineness is ≤5um (micrometer), to obtain a mixed solution;

[0057] b. Add 0.1Kg of light stabilizer 770, 0.1Kg of UV absorber UV-326, 0.1Kg of leveling agent polydimethylsiloxane, and 0.1Kg of defoamer BYK-065 to the resulting solution, and slowly add the light stabilizer, UV absorber, leveling agent, and defoamer to the mixture at a speed of 500 rpm, and stir for 10 minutes until uniform;

[0058] c. Add 5 kg of rare earth-doped strontium aluminate luminescent powder with a particle size of 3 μm (Dongguan Chunliang Craft Materials Co., Ltd., model AG-917 long-lasting luminescent green) to the above-obtained solution, slowly add the rare earth-doped strontium aluminate luminescent powder to the solution at a speed of 300 rpm, stir for 15 minutes, until stirred evenly; obtain rare earth long-lasting luminescent luminescent silk-screen ink, the fineness of which is ≤5 um.

[0059] Example 4

[0060] The difference between this embodiment and embodiment 1 is that the particle size of the added rare earth doped strontium aluminate luminescent powder (manufacturer is Guangzhou Shengzhu Daily Pigment Co., Ltd., model number is SY-3CW luminescent powder) is 6 μm.

[0061] Comparative Example 1

[0062] The difference between this embodiment and embodiment 1 is that the acid value of the acrylic resin used is 9-13 mgKOH / g. The manufacturer is Guangdong Kelisen Resin Co., Ltd., and the model is KN5353F.

[0063] Comparative Example 2:

[0064] This comparative example provides a method for preparing a silk screen ink and a silk screen ink prepared by the method. The method comprises:

[0065] a. Put 5 kg of acrylic resin (Japanese Mitsubishi Rayon resin, model BR-116) with an acid value of 7 mgKOH / g into a dispersion container. Specifically, 50% BR-116, 25% ethylene glycol diacetate, and 25% isophorone are mixed to form a 50% resin solution. Stirring is started, 0.15 kg of anti-settling agent fumed silica is added, and the anti-settling agent is slowly dissolved into the resin solution at a speed of 100 rpm. Stir for 5 minutes until it is evenly stirred, then switch to a high speed of 500 rpm and stir for 15 minutes until the fineness is ≤5um (micrometer) to obtain a mixed solution;

[0066] b. Add 0.1Kg of light stabilizer 770, 0.1Kg of UV absorber UV-326, 0.1Kg of leveling agent polydimethylsiloxane, and 0.1Kg of defoamer BYK-065 to the resulting solution, and slowly add the light stabilizer, UV absorber, leveling agent, and defoamer to the mixture at a speed of 400 rpm, and stir for 5 minutes until uniform;

[0067] c. Add 5 kg of short-acting luminous powder with a particle size of 25 μm (model ZNS-400 of Shenzhen Xinxingyuan Luminescent Technology Co., Ltd.) to the above solution, slowly add the rare earth-doped strontium aluminate luminous powder to the solution at a speed of 200 rpm, stir for 10 minutes until it is evenly stirred; obtain silk screen ink, the fineness of which is 35 um.

[0068] It is not suitable for silk screen printing and will cause screen blocking problems.

[0069] Comparative Example 3

[0070] This comparative example provides a method for preparing a silk screen ink and a silk screen ink prepared by the method. The method comprises:

[0071] a. Put 5 kg of acrylic resin (Japanese Mitsubishi Rayon resin, model BR-116) with an acid value of 7 mgKOH / g into a dispersion container. Specifically, 50% BR-116, 25% ethylene glycol diacetate, and 25% isophorone are mixed to form a 50% resin solution. Stirring is started, 0.15 kg of anti-settling agent fumed silica is added, and the anti-settling agent is slowly dissolved into the resin solution at a speed of 100 rpm, and stirred for 5 minutes until it is evenly stirred, and then the speed is changed to a high speed of 500 rpm, and stirred for 15 minutes until the fineness is ≤5um (micrometer) to obtain a mixed solution;

[0072] b. Add 0.1Kg of light stabilizer 770, 0.1Kg of UV absorber UV-326, 0.1Kg of leveling agent polydimethylsiloxane, and 0.1Kg of defoamer BYK-065 to the resulting solution, and slowly add the light stabilizer, UV absorber, leveling agent, and defoamer to the mixture at a speed of 400 rpm, and stir for 5 minutes until uniform;

[0073] c. Add 5 kg of ordinary long-lasting luminous powder with a particle size of 15-30 μm (manufacturer: Dalian Luming Technology Group Co., Ltd., model number PLO-7C) to the above solution, slowly add rare earth-doped strontium aluminate luminous powder to the solution at a speed of 200 rpm, stir for 10 minutes until it is evenly stirred; obtain silk screen ink, the fineness of which is 15 um.

[0074] It is suitable for screen printing, but it will also cause screen blocking problems. In addition, the surface after printing is relatively rough and feels bad.

[0075] Comparative Example 4:

[0076] This comparative example provides a method for preparing a silk screen ink and a silk screen ink prepared by the method. The method comprises:

[0077] a. Put 4 kg of acrylic resin (Japanese Mitsubishi Rayon resin, model BR-116) with an acid value of 7 mgKOH / g into a dispersion container, specifically using 50% BR-116, 25% ethylene glycol diacetate, and 25% isophorone by mass, and stir at a speed of 400-600 rpm for 1-2 hours until completely dissolved to obtain a 50% resin solution by mass. Start stirring, add 0.1 kg of anti-settling agent fumed silica, slowly dissolve the anti-settling agent into the resin solution at a speed of 200 rpm, stir for 10 minutes, and after stirring evenly, switch to a high speed of 600 rpm and stir for 15 minutes until the fineness is ≤5um (micrometers) to obtain a mixed solution;

[0078] b. Add 0.1Kg of leveling agent polydimethylsiloxane and 0.1Kg of defoamer BYK-065 to the resulting solution, slowly add the light stabilizer, UV absorber, leveling agent and defoamer to the mixture at 500 rpm, and stir for 10 minutes until uniform;

[0079] c. Add 6 kg of rare earth-doped strontium aluminate luminescent powder with a particle size of 3 μm (manufacturer: Guangzhou Shengzhu Daily Pigment Co., Ltd., model 6B-02 luminous yellow) to the above solution, slowly add the rare earth-doped strontium aluminate luminescent powder to the solution at a speed of 300 rpm, stir for 15 minutes until it is evenly stirred; obtain silk screen ink, the fineness of the silk screen ink is ≤5 μm.

[0080] Comparative Example 5

[0081] This comparative example provides a method for preparing a silk screen ink and a silk screen ink prepared by the method. The method comprises:

[0082] a. Add 6 kg of acrylic resin (Mitsubishi Rayon resin, model MB-2952, represented by Shanghai Kaiyin Chemical Co., Ltd.) with an acid value of ≤1 mgKOH / g into a dispersion container. Specifically, a mass fraction of 50% MB-2952, 25% ethylene glycol diacetate, and 25% isophorone is used. Stir at a speed of 400 to 600 rpm for 1 to 2 hours until completely dissolved to obtain a resin solution with a mass fraction of 50%. Start stirring, add 0.2 kg of anti-settling agent fumed silica, 0.1 kg of light stabilizer 770, 0.1 kg of ultraviolet absorber UV-326, 0.1 kg of leveling agent polydimethylsiloxane, 0.1 kg of defoamer BYK-065, 4 kg of rare earth-doped strontium aluminate luminous powder with a particle size of 3 μm (manufacturer: Dongguan Chunliang Craft Materials Co., Ltd., model AG-806 long-lasting luminous green), add the above raw materials at a speed of 400 rpm, stir for 15 minutes, and obtain silk screen ink. The silk screen ink particles are unevenly distributed and agglomerated.

[0083] It can be suitable for silk screen printing, but it will also cause the problem of silk screen blocking.

[0084] Comparative Example 6

[0085] The difference between this comparative example and Example 1 is that the rare earth doped strontium aluminate luminescent powder with a particle size of 3 μm is added during the first step of stirring. Specifically:

[0086] a. Put 6 kg of acrylic resin (Japanese Mitsubishi Rayon resin represented by Shanghai Kaiyin Chemical Co., Ltd., model MB-2952) with an acid value of ≤1 mgKOH / g into a dispersion container, specifically using 50% MB-2952, 25% ethylene glycol diacetate, and 25% isophorone by mass fraction, stirring at a speed of 400-600 rpm for 1-2 hours until completely dissolved to obtain a 50% resin solution by mass fraction. Start stirring, add 0.2 kg of anti-settling agent fumed silica and 4 kg of rare earth doped strontium aluminate luminous powder with a particle size of 3 μm (manufacturer is Dongguan Chunliang Craft Materials Co., Ltd., model AG-806 long-lasting luminous green), slowly add the anti-settling agent and luminous powder to the resin liquid at a speed of 100 rpm, stir for 5 minutes, and after stirring evenly, switch to a high speed of 500 rpm and stir for 15 minutes to obtain a mixed solution;

[0087] b. Add 0.1Kg of light stabilizer 770, 0.1Kg of ultraviolet absorber UV-326, 0.1Kg of leveling agent polydimethylsiloxane, and 0.1Kg of defoamer BYK-065 to the resulting solution, slowly add the light stabilizer, ultraviolet absorber, leveling agent, and defoamer to the mixture at a speed of 400 rpm, stir for 5 minutes, until stirred evenly, to obtain a rare earth long-lasting luminous luminous silk screen ink, the silk screen ink particles are unevenly distributed and agglomerated.

[0088] It can be suitable for silk screen printing, but it will also cause the problem of silk screen blocking.

[0089] Performance Testing

[0090] The above embodiments and comparative examples were subjected to performance tests using the following methods and equipment.

[0091] Test equipment: BT-Z-1100 UV accelerated tester

[0092] Reference standard: GB / T1865-1997 "Artificial weathering and artificial radiation exposure of paints and varnishes"

[0093] GB / T1766-1995 "Rating method for aging of paint and varnish coatings"

[0094] Test panel test operation method: direct exposure to radiant light.

[0095] Test time interval: 72 hours.

[0096] (1) Evaluation of color change grades. The corresponding relationship between the rating grades and the color difference values ​​measured by the instrument is shown in Table 1.

[0097] According to the provisions of GB / T1766-1995, the aged sample is compared with the unaged sample bracket standard version, and the color change degree of the paint film before and after aging is rated (visual colorimetry and instrumental electrical measurement method):

[0098] Table 1

[0099] grade Discoloration degree (visual inspection) Color difference value (NBS) (instrument measurement) 0 No discoloration ≤1.5 1 Very slight discoloration 1.6～3.0 2 Slight discoloration 3.1～6.0 3 Obvious discoloration 6.1～9.0 4 Larger discoloration 9.1～12.0 5 Severe discoloration ＞12.0

[0100] (2) Sample color change effect after QUV:

[0101] After the silk-screen ink prepared in the embodiment is silk-screened onto a logo nameplate sample, it is irradiated with a UV lamp in a dark room for 30±2 seconds, and then the UV lamp is turned off to check the luminous effect.

[0102] See also Figure 1 and Figure 2 , Figure 1 (a) is a picture of the screen printing ink prepared in Example 1 before QUV after being screen printed on a logo nameplate sample. Figure 1(b) is a picture of the screen printing ink prepared in Example 1 after QUV printing on the logo nameplate sample. Figure 2 (a) is a picture showing the luminous effect of the screen printing ink prepared in Example 1 before QUV being screen printed on a logo nameplate sample. Figure 2 (b) is a photo of the luminous effect of the screen printing ink prepared in Example 1 printed on a logo nameplate sample after QUV. It can be seen that there is no difference in the green luminous effect before and after QUV irradiation.

[0103] See also Figure 3 and Figure 4 , Figure 3 (a) is a picture of the screen printing ink prepared in Example 2 before QUV after being screen printed on a logo nameplate sample. Figure 3 (b) is a picture of the screen printing ink prepared in Example 2 after QUV printing on the logo nameplate sample. Figure 4 (a) is a picture showing the luminous effect of the screen printing ink prepared in Example 2 before QUV being screen printed on a logo nameplate sample. Figure 4 (b) is a picture of the luminous effect of the screen printing ink prepared in Example 2 printed on a logo nameplate sample after QUV. It can be seen that there is no difference in the blue light effect before and after QUV irradiation.

[0104] The test results of the above embodiments and comparative examples are shown in Table 2.

[0105] Table 2

[0106]

[0107] The screen aperture used in the screen printing in the above embodiments and comparative examples is 300 meshes.

[0108] As can be seen from the results in Table 2, by comparing Examples 1-4 with Comparative Examples 1-2, compared with the traditional preparation and formulation of silk-screen ink, the silk-screen ink prepared by the preparation method of the present invention and suitable raw materials and their proportions has a smaller QUV72-hour color change grade and better anti-aging performance. As can be seen from Examples 1-4 and Comparative Example 1, the acid value of the acrylic resin affects the luminous duration and anti-aging performance of the silk-screen ink. If the acid value is too large, the luminous duration and anti-aging performance of the silk-screen ink are reduced. As can be seen from Comparative Examples 2-3, the particle size of the luminous powder affects the silk-screen effect. If the particle size is too large, it is easy to block the network. As can be seen from Example 1 and Comparative Example 4, if no light stabilizer and ultraviolet absorber are added to the silk-screen ink, the luminous duration and anti-aging performance of the silk-screen ink are reduced. As can be seen from Example 1 and Comparative Example 5, the method of directly mixing all the raw materials and then stirring them is prone to uneven particle distribution, agglomeration, and easy blocking of the network. It can be seen from Example 1 and Comparative Example 6 that only using a two-step stirring method and changing the order of adding materials can easily lead to uneven particle distribution and agglomeration, which cannot meet the requirements of screen printing and is prone to screen blocking.

[0109] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the patent protection scope of the present invention.

Claims

1. A rare earth long-lasting luminous luminous silk screen printing ink, characterized in that: The composition comprises the following components in parts by weight: 40-60 parts of acrylic resin or polyester resin, 40-60 parts of rare earth doped strontium aluminate luminescent powder, 1-2 parts of light stabilizer, 1-2 parts of ultraviolet absorber, 1-2 parts of anti-settling agent, 1-2 parts of leveling agent, 1-2 parts of defoaming agent; Wherein, the acid value of the acrylic resin or polyester resin is ≤1 mgKOH / g; The light stabilizer includes a hindered amine light stabilizer, and the ultraviolet absorber includes a benzotriazole ultraviolet absorber.

2. The rare earth long-lasting luminous luminous silk screen printing ink according to claim 1, characterized in that: The particle size of the rare earth doped strontium aluminate luminous powder is 3-6 μm.

3. The rare earth long-lasting luminous luminous silk screen printing ink according to claim 1, characterized in that: The rare earth element doped in the rare earth doped strontium aluminate luminous powder is at least one of Eu and Dy.

4. The rare earth long-lasting luminous luminous silk screen printing ink according to claim 1, characterized in that: The anti-settling agent includes fumed silica.

5. The rare earth long-lasting luminous luminous silk screen printing ink according to claim 1, characterized in that: The leveling agent includes an organic silicon leveling agent; And / or, the defoaming agent includes a silicone defoaming agent.

6. A method for preparing the rare earth long-lasting luminous luminous silk screen printing ink according to any one of claims 1 to 5, characterized in that: The following steps are involved: adding an anti-settling agent to an acrylic resin or a polyester resin, and stirring the mixture according to a first stirring condition to obtain a mixed solution; Adding a light stabilizer, a UV absorber, a leveling agent and a defoamer into the mixed solution, and stirring according to the second stirring condition; Rare earth-doped strontium aluminate luminescent powder is added, and stirring is performed according to the third stirring condition to obtain the rare earth long-lasting luminescent luminescent silk screen ink.

7. The preparation method according to claim 6, characterized in that: The first stirring condition includes: stirring at a speed of 100 to 200 rpm for 5 to 10 minutes, and then stirring at a speed of 500 to 600 rpm for 15 minutes; and / or, The second stirring condition includes: stirring at a speed of 400 to 500 rpm for 5 to 10 minutes; and / or, The third stirring condition includes: stirring at a rotation speed of 200 to 300 rpm for 10 to 15 minutes.

8. An application of the rare earth long-lasting luminous luminous silk screen printing ink according to any one of claims 1 to 5, characterized in that: The rare earth long-lasting luminous luminous silk-screen printing ink is printed on the logo nameplate by silk-screen printing.

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