High-stability noctilucent spherical water-absorbent resin and preparation method therefor

Abstract

A high-stability noctilucent spherical water-absorbent resin, mainly comprising the following raw materials in percentages by weight: 20-40% of a water-soluble monomer, 0-20% of an alkali, 0.02-0.5% of a cross-linking agent, 0.1-0.5% of an initiator, 0.2-5% of a dispersing agent, 1-5% of a thickening agent, 0.5-1% of a buffering agent, 2-8% of a noctilucent powder, 0.01-0.5% of a hydrolysis inhibitor, and 0.1-0.5% of a chelating agent, with the balance being water, wherein the sum of the weight percentages of the above components is 100%. The noctilucent spherical water-absorbent resin is obtained by subjecting an aqueous reaction solution consisting of the components to natural settling and suspension polymerization in an oily medium. The utilization of the surface-coated noctilucent powder and the hydrolysis inhibitor can improve the stability of the noctilucent powder in the water-absorbent resin.

Description

A high-stability luminous spherical water-absorbing resin and preparation method thereof Technical Field

[0001] The invention relates to the technical field of water-absorbing resins, and in particular to a high-stability luminous spherical water-absorbing resin and a preparation method thereof. Background Art

[0002] Water-absorbent resin is a highly absorbent material. It is a functional polymer with a three-dimensional cross-linked network structure that can absorb water tens to hundreds of times its own weight. It is widely used in daily chemical products, agricultural and forestry water-retaining materials, sanitary materials, medical equipment, toys and other fields. Existing toy water marbles can only be shot under the conditions of daylight or other general light sources. They do not have the luminous function under dark conditions, which brings a lot of inconvenience to users. With the development of science and technology, people's requirements for spiritual quality have increased. Modern night CS (real-life CS confrontation) has become more and more colorful. Traditional commercially available ordinary water marbles can no longer meet the needs of modern night CS.

[0003] A luminescent material is a functional material composed of a matrix material and doped trace impurity atoms (luminescence centers, also called activators). Common matrices for luminescent materials are generally sulfides, halides, silicates, aluminates, and phosphates. As the main component of the luminescent material, the matrix provides a suitable carrier for the doped impurity atoms, anchoring the luminescence centers. Dopant atoms, also called luminescence centers, although they only constitute a tiny fraction of the entire material, play a decisive role in the luminescence process. Luminescence centers are generally non-ferrous metals or rare earth metals, such as Mn, Mo, Cu, Eu, Dy, and Tb. Some luminescent materials contain two different trace elements: one, called an activator, acts as a luminescence center, and the other, a co-activator or sensitizer. The co-activator itself lacks luminescence or emits weak light, but it plays a crucial role in the luminescence properties of the activator, typically by transferring energy and significantly influencing the material's afterglow. For example, SrAl2O4:Eu 2+ ,Dy 3+ It is a common yellow-green long afterglow luminescent material, among which Eu 2+ As the luminescence center, Dy 3+ It acts as an auxiliary activator to transfer energy and also prolong the afterglow life of the luminescent material.

[0004] Due to SrAl2O4:Eu 2+ ,Dy 3+Long-lasting luminescent materials offer advantages and characteristics not found in other materials, such as high brightness and long afterglow time. These advantages have led to their widespread application in various fields of modern life, with promising applications. Consequently, aluminate luminescent materials are attracting increasing attention, and research and development efforts are becoming increasingly intensive. However, these materials also have drawbacks, such as susceptibility to deliquesce and hydrolysis, poor thermal stability, and poor dispersibility. These limitations restrict their application in various fields and limit their scope of use.

[0005] (1) Poor water resistance

[0006] Strontium aluminate luminescent materials are extremely susceptible to deliquesce or hydrolysis when in contact with water. After hydrolysis, the crystal structure of the luminescent material is destroyed, and its luminescent performance is greatly reduced or lost, which greatly limits the application of this luminescent material in aqueous systems.

[0007] (2) Poor thermal degradation performance

[0008] During high-temperature baking or calcination, the luminescent center of the luminescent material is oxidized or microstructural changes occur, which can also cause the performance of the luminescent material to deteriorate, manifesting as brightness attenuation, chromatic aberration shift and other phenomena, reducing the performance of luminescent material products and limiting the application of luminescent materials under high-temperature conditions.

[0009] Ordinary luminescent powders lack excellent acid, alkali, and high-temperature resistance during use, making them inadequate for transportation and long-term storage. However, luminescent powders coated with shell materials exhibit significantly improved aging resistance. Improving the water resistance of luminescent powders typically involves coating the surface with a layer of SiO2 to enhance their hydrolysis resistance (Journal of Hebei University (Natural Science Edition), Vol. 28, No. 3, 2008, p. 248-251; Solid State Sciences 65 (2017), 88-94). Alternatively, strontium aluminate can be secondary coated with a silane coupling agent and AA / MMA. The resulting product is completely and tightly coated, exhibiting excellent water resistance and capable of withstanding hydrolysis for up to 100 hours. However, the use of an opaque polymer for secondary coating reduces the intensity of the emitted and excited light. (Guangdong Chemical Industry, No. 7, 2005, p. 22-24)

[0010] Although the technology of coating the surface of the luminous powder can inhibit the hydrolysis reaction of the luminous powder in water to a certain extent, since the water-absorbing resin is mainly composed of sodium polyacrylate, the pH is generally less than 7 and contains a high concentration of Na +, with its strong electrical conductivity, easily triggers an electrochemical reaction on the surface of the glow-in-the-dark powder, accelerating its hydrolysis. Furthermore, during use, the glow-in-the-dark powder is continuously in contact with water after swelling in water to form a hydrogel. Therefore, when applying glow-in-the-dark powder to water-absorbing resins, its hydrolysis resistance and stability need to be further enhanced.

[0011] Summary of the Invention

[0012] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a high-stability luminous spherical water-absorbing resin and a preparation method thereof. In the system, on the one hand, a surface-coated luminous powder is used as the luminescent material, and on the other hand, a metal salt that easily undergoes precipitation reaction with hydroxide is added as a hydrolysis inhibitor, thereby improving the stability of the luminous powder in the water-absorbing resin.

[0013] The technical solution adopted by the present invention to solve the technical problem is: a high-stability luminous spherical water-absorbent resin, which mainly comprises, by weight percentage, 20% to 40% of a water-soluble monomer, 0% to 20% of an alkali, 0.02% to 0.5% of a cross-linking agent, 0.1% to 0.5% of an initiator, 0.2% to 5% of a dispersant, 1% to 5% of a thickener, 0.5% to 1% of a buffer, 2% to 8% of a luminous powder, 0.01% to 0.5% of a hydrolysis inhibitor, 0.1% to 0.5% of a chelating agent, and the balance is water, and the total weight percentage content of the above components is 100%; the reaction aqueous solution composed of the above components is subjected to natural sedimentation suspension polymerization in an oily medium to obtain the luminous spherical water-absorbent resin.

[0014] Furthermore, the luminous powder is a luminous powder with a surface water-repellent treatment; the water-repellent treatment is performed using a silicate or silane coupling agent to form a silicon dioxide coating layer on the surface of the luminous powder.

[0015] Furthermore, the luminous powder after water repellent treatment is subjected to secondary coating, and the secondary coating is specifically: dispersing and polymerizing the luminous powder with a silica coating layer on the surface, a reactive monomer, and a dispersant in water, thereby forming a polymer shell layer on the surface of the luminous powder with a silica coating layer on the surface.

[0016] The polymer shell layer has hydrophilic groups, which include hydroxyl, amino, epoxy, and carboxylic acid groups; the reactive monomer is one or more of a mixture of melamine and formaldehyde, acrylate, isocyanate, and epoxy resin; and the dispersant is a surfactant or a high molecular polymer.

[0017] Furthermore, the hydrolysis inhibitor is a metal salt that easily undergoes precipitation reaction with hydroxide; the metal salt is one or a mixture of zinc salt, magnesium salt, calcium salt, iron salt, zirconium salt, barium salt, nickel salt, titanium salt, and cobalt salt.

[0018] Furthermore, the water-soluble monomer includes one or more mixtures of acrylic acid, acrylic acid salt, acrylamide, and 2-acrylamide-2-methylpropanesulfonic acid; and the base is any one of sodium hydroxide, potassium hydroxide, sodium carbonate, and sodium bicarbonate.

[0019] Furthermore, the cross-linking agent is a multi-double bond group compound or a multi-epoxy group compound; the multi-double bond group compound is one or more of polyethylene glycol di(meth)acrylate, diethylene glycol dimethacrylate, allyl methacrylate, 1,1,1-trimethylolpropane triacrylate, triallylamine, N'N-methylenebisacrylamide, and tetraallyloxyethane; the multi-epoxy group compound is one or more of ethylene glycol diglycidyl ether and polyethylene glycol diglycidyl ether.

[0020] Furthermore, the initiator is one or more of azo water-soluble initiators, cerium salts, persulfates, persulfate-NaHSO3 systems, persulfate-organic amine systems, and hydrogen peroxide-ascorbic acid systems; the dispersant is one or more of Tween 80, Tween 85, OP-10, and quaternary ammonium salt dispersants; and the thickener is one or more of cellulose, starch, polyacrylamide, sodium polyacrylate, and polyvinyl alcohol. The thickener's function is to prevent aggregation of the glow powder during sedimentation polymerization by increasing the viscosity of the monomer solution, as the density of the glow powder is greater than that of the monomer solution, thereby ensuring uniform distribution of the glow powder in the monomer solution.

[0021] Furthermore, the chelating agent is an aminopolycarboxylic acid compound, including ethylenediaminetetraacetic acid and its sodium salt EDTA. EDTA is added to the system to chelate with the metal salt of the hydrolysis inhibitor, inhibiting the ionic crosslinking reaction between the metal ions and the sodium polyacrylate component of the water-absorbing resin, thereby preventing a decrease in water retention. The buffering agent is disodium hydrogen phosphate-sodium dihydrogen phosphate, dipotassium hydrogen phosphate-potassium dihydrogen phosphate, or acrylic acid-sodium acrylate.

[0022] Principle of inhibiting hydrolysis: The surface of the luminous powder used in the system has been treated with water repellent to form a layer of nano-silicon dioxide coating on the surface, which has certain water repellency. However, since the water-absorbing resin is mainly composed of sodium polyacrylate, the pH is generally less than 7, and it contains a high concentration of Na + , has strong electrical conductivity, easily forming an electrochemical reaction on the surface of the glow-in-the-dark powder, accelerating the hydrolysis of the glow-in-the-dark powder. Therefore, when immersed in water for a long time, it will slowly hydrolyze, reducing the life of the glow-in-the-dark powder. Strontium aluminate luminescent material is very easy to deliquesce or hydrolyze when in contact with water. Its hydrolysis reaction equation is as follows: SrAl2O4+4H2O→Sr 2+ +8OH - +2Al 3+ (Formula 1)

[0023] During the hydrolysis process, hydroxide is produced, and the pH value rises. Therefore, as the hydrolysis continues, the pH value continues to rise. The increased pH and alkalinity will destroy the silica coating on the surface, further accelerating the hydrolysis, causing the luminous material to lose its luminous function and form a white powder.

[0024] Therefore, in the system of the present invention, on the one hand, the surface-coated luminous powder is used as the luminescent material, and on the other hand, a metal salt that easily reacts with hydroxide to precipitate is added as a hydrolysis inhibitor to improve the stability of the luminous powder in the water-absorbing resin. Taking zinc chloride as an example, when hydrolysis occurs, due to the zinc ions (Zn 2+ ) easily reacts with hydroxide to produce zinc hydroxide precipitate (as shown in Formula 2). The precipitate is deposited on the surface of the glow-in-the-dark powder, forming a passivation layer on the surface of the glow-in-the-dark powder particles. This hinders the migration of surface charges, enhances the hydrolysis inhibition performance of the glow-in-the-dark powder surface, and inhibits further hydrolysis of strontium aluminate. The schematic diagram of the formation of the passivation layer on the glow-in-the-dark powder surface is shown in Figure 1. Zn 2+ +2OH - →Zn(OH)2 ↓ (Formula 2)

[0025] The addition of buffer can stabilize the pH value to a certain extent and further improve the stability of the glow-in-the-dark powder.

[0026] The present invention also discloses a method for preparing a high-stability luminous spherical water-absorbent resin, which comprises the following steps: S1, stirring and mixing a water-soluble monomer, an alkali, a thickener, a luminous powder, a dispersant, a hydrolysis inhibitor, an initiator, a cross-linking agent, a buffer, and a chelating agent according to a certain weight percentage to obtain a reaction aqueous solution; heating an oil bath in a reaction tower to 50-100° C.; S2, adding the reaction aqueous solution to a storage tank of a droplet former; S3, the reaction aqueous solution passes through the droplet former to form spherical droplets with a luminous effect, which enter the reaction tower for a polymerization reaction; the spherical droplets settle from the oil bath liquid surface to the bottom of the reaction tower, and after being kept warm for a period of time, the reaction ends to obtain a spherical water-absorbent resin; S4, releasing the spherical water-absorbent resin from the bottom of the reaction tower, filtering and washing to obtain a spherical water-absorbent resin gel with a certain water content and a luminous effect; S5, drying the water-containing spherical water-absorbent resin to obtain a spherical water-absorbent resin solid with a luminous effect after drying.

[0027] The luminous spherical water-absorbing resin prepared in the present invention can be applied to the fields of water marbles, toys, etc.

[0028] The beneficial effects of the present invention are as follows: compared with the prior art, the high-stability luminous spherical water-absorbing resin and the preparation method thereof provided by the present invention have the following advantages:

[0029] 1) adding a hydrolysis inhibitor and a buffer to inhibit the hydrolysis of the luminous powder, thereby increasing the lifespan and luminous intensity of the luminous powder and preparing a luminous spherical water-absorbing resin that is stable for a long time;

[0030] 2) The luminous powder is secondary coated by wrapping it with a polymer shell to prevent the luminous powder from becoming ineffective due to friction, hydrolysis, etc., thereby improving the stability and luminous life of the luminous powder; the surface of the polymer shell contains hydrophilic groups, which can improve the dispersion stability of the luminous powder in aqueous solutions; the surface groups of the polymer shell can react with the carboxyl groups in the acrylic monomer to improve the gel strength of the water-absorbing resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram showing the formation of a passivation layer on the surface of the luminous powder in the present invention. DETAILED DESCRIPTION

[0032] The present invention will be further described below by way of specific examples, which are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

[0033] Test method:

[0034] 1. Gel strength test

[0035] The gel strength of the absorbent resin is tested using a universal testing machine. Spherical gel particles are placed directly under a dedicated gel strength probe. The probe squeezes the particles until they break. The force required to break the particles is recorded and defined as the gel strength of the spherical absorbent resin particles.

[0036] 2. Luminous intensity test

[0037] Weigh 30g of the luminous ball, add it to 3L of deionized water, soak it at 20-30℃ for 8 hours, remove excess water, place it under a D65 light source for 30 minutes, place it in a dark room with (0-0.03Lux), and measure its Lux value.

[0038] 3. Aging test

[0039] Weigh 30g of the luminous ball, add it to 3L of deionized water, soak it at 20-30℃ for 8 hours, remove excess water, place the ball in a constant temperature and humidity box at 50℃, age it for 14 days, observe the luminescence of the luminous ball, and test the luminescence intensity and pH value after aging.

[0040] 4. pH test

[0041] About 1 g of spherical gel was crushed and added to 100 mL of deionized water solvent, stirred for 1 hour, filtered, and the pH value of the filtrate was tested.

[0042] 5. Particle size test

[0043] Weigh 30g of luminous balls, add them into 3L of deionized water, soak them at 20-30℃ for 8 hours, remove excess water, take 20 balls each time, measure the length with a square ruler, take the average value, and take the average value of the data after testing 3 groups.

[0044] Example 1

[0045] Add 15g of sodium hydroxide and 48g of water to a batching kettle, followed by 30g of acrylic acid. Cool to 25°C, then add 0.2g of N'N-methylenebisacrylamide, 0.1g of OP-10, 0.3g of zinc chloride, 0.1g of EDTA, 0.2g of sodium dihydrogen phosphate and sodium dihydrogen phosphate, and 1g of CMC. Stir to thicken. Then add 5g of luminous powder (surface treated for water repellency) and 0.1g of potassium persulfate. Stir thoroughly. Heat the reactor to 80-90°C in advance and transfer the dissolved and dispersed material to a drip tray. The drip column is 80-90°C. A droplet former is used to form spherical droplets of the luminous material into the reactor. The bottom outlet connected to the reactor is used for oil spherical separation. The luminous spherical gel is then dried, cleaned, and sieved.

[0046] The preparation methods of Examples 2 to 8 are the same as those of Example 1, and the specific raw material ratios are shown in Table 1 below.

[0047] Example 9

[0048] Add 10g of sodium hydroxide and 48g of water to a batching kettle, followed by 20g of acrylic acid, 5g of 2-acrylamido-2-methylpropanesulfonic acid, and 10g of acrylamide. Cool to 25°C, then add 0.2g of N'N-methylenebisacrylamide, 0.1g of OP-10, 0.1g of zinc chloride, 0.1g of EDTA, 0.2g of dipotassium hydrogen phosphate, and 1g of CMC. Stir to thicken the mixture. Then, add 5g of polymer-shelled luminous powder and 0.1g of potassium persulfate, stirring evenly. Heat the reactor to 80-90°C in advance and transfer the dissolved and dispersed material to a drip tray. The drip column is 80-90°C. A droplet former is used to form spherical droplets of the luminous material and drip them into the reactor. The oil spheres are separated at the bottom outlet of the reactor. The spherical luminous gel is dried, cleaned, and sieved.

[0049] The preparation method for the polymer-shelled glow-in-the-dark powder is as follows: 24.48g of melamine, 47.34g of 37% formaldehyde, and 24.48g of pure water are added to a mixing kettle (1). The pH is adjusted to approximately 9 with triethylamine, and then heated in a 70°C waterbath until the mixture becomes clear with stirring. 600g of glow-in-the-dark powder (with a water-repellent surface treatment), 600g of pure water, and 120g of a 5% K30 (surfactant) solution are added to a mixing kettle (2) and heated to 60°C. The liquid from mixing kettle (1) is added to mixing kettle (2), and the pH is adjusted to 4.5-5 with dilute hydrochloric acid. The mixture is then allowed to react at 60°C for 1 hour, filtered, and dried to obtain the glow-in-the-dark powder coated with melamine resin.

[0050] Comparative Example 1

[0051] Add 15g of sodium hydroxide and 48g of water to the batching kettle, then add 30g of acrylic acid. Cool to 25°C, add 0.2g of N'N-methylenebisacrylamide and 1g of CMC, stir to thicken, then add 5g of luminous powder (surface treated for water repellency) and 0.1g of potassium persulfate, and stir evenly. Heat the reaction tower to 80-90°C in advance, and transfer the dissolved and dispersed materials to the drip tray. The drip column is 80-90°C. Use a droplet former to form spherical droplets of the luminous material and drip them into the reaction tower. The bottom discharge port connected to the reaction tower is used for oil ball separation. Rotary cleaning process: The spherical luminous ball gel is dried, cleaned, and sieved.

[0052] After aging test at 50℃ for about 6 days, the luminous effect is lost.

[0053] Comparative Example 2

[0054] Add 10g of sodium hydroxide and 48.7g of water to a batching kettle, followed by 22.5g of acrylic acid, 2.5g of 2-acrylamido-2-methylpropanesulfonic acid, and 10g of acrylamide. Cool to 25°C, then add 0.2g of N'N-methylenebisacrylamide and 1g of CMC. Stir to thicken, then add 5g of luminescent powder (surface treated for water repellency) and 0.1g of potassium persulfate. Stir thoroughly. Heat the forming tower to 80-90°C in advance and transfer the dissolved and dispersed material to the drip tray. The drip column is kept at 80-90°C. A droplet former is used to form spherical droplets of the luminescent material into the reaction tower. The bottom outlet connected to the reaction tower is used for oil spherical separation. Rotary cleaning process: The spherical luminescent gel is dried, cleaned, and sieved.

[0055] After aging test at 50℃ for about 8 days, the luminous effect is lost.

[0056] The performance test results of the water-absorbing resins obtained in Examples 1 to 9 and Comparative Examples 1 to 2 are shown in Table 2 below.

[0057] Comparing the performance test results of Examples 1 and 2 with those of the various Examples, we show that the luminescence intensity and pH value of the luminescent spherical water-absorbent resin prepared after adding a hydrolysis inhibitor, buffer, chelating agent, and dispersant show little change before and after aging. This indicates that the hydrolysis inhibitor, in conjunction with the other additives, enhances the hydrolysis inhibition properties of the luminescent powder surface, inhibiting hydrolysis. In Example 9, a luminescent powder with a polymer shell was used. Although the luminescence intensity of the resulting luminescent water-absorbent resin decreased due to the addition of the coating, it remained virtually unchanged before and after aging, further demonstrating that the polymer shell effectively blocks hydrolysis.

[0058] The above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention. The scope of patent protection of the present invention should be defined by the claims.

Claims

1. A high-stability luminous spherical water-absorbing resin, characterized in that: In terms of weight percentage, the luminous spherical water-absorbent resin mainly includes 20% to 40% water-soluble monomers, 0% to 20% alkali, 0.02% to 0.5% cross-linking agent, 0.1% to 0.5% initiator, 0.2% to 5% dispersant, 1% to 5% thickener, 0.5% to 1% buffer, 2% to 8% luminous powder, 0.01% to 0.5% hydrolysis inhibitor, 0.1% to 0.5% chelating agent, and the balance is water, and the total weight percentage content of the above components is 100%; the reaction aqueous solution composed of the above components is subjected to natural sedimentation suspension polymerization in an oily medium to obtain the luminous spherical water-absorbent resin.

2. A high-stability luminous spherical water-absorbing resin as claimed in claim 1, characterized in that: The luminous powder is a luminous powder with a surface treated with water repellency; the water repellency treatment is performed by using a silicate or a silane coupling agent to form a silicon dioxide coating layer on the surface of the luminous powder.

3. A high-stability luminous spherical water-absorbing resin as claimed in claim 2, characterized in that: The luminous powder after water repellent treatment is subjected to secondary coating, and the secondary coating is specifically: dispersing and polymerizing the luminous powder with a silica coating layer on the surface, a reactive monomer, and a dispersant in water, thereby forming a polymer shell layer on the surface of the luminous powder with a silica coating layer on the surface.

4. A high-stability luminous spherical water-absorbing resin as claimed in claim 3, characterized in that: The polymer shell layer has hydrophilic groups, which include hydroxyl, amino, epoxy, and carboxylic acid groups; the reactive monomer is one or more of a mixture of melamine and formaldehyde, acrylate, isocyanate, and epoxy resin; and the dispersant is a surfactant or a high molecular polymer.

5. A high-stability luminous spherical water-absorbing resin as claimed in claim 1, characterized in that: The hydrolysis inhibitor is a metal salt that is easily precipitated with hydroxide; the metal salt is one or a mixture of zinc salt, magnesium salt, calcium salt, iron salt, zirconium salt, barium salt, nickel salt, titanium salt and cobalt salt.

6. A high-stability luminous spherical water-absorbing resin as claimed in claim 1, characterized in that: The water-soluble monomer includes one or more mixtures of acrylic acid, acrylic acid salt, acrylamide, and 2-acrylamide-2-methylpropane sulfonic acid; the base is any one of sodium hydroxide, potassium hydroxide, sodium carbonate, and sodium bicarbonate.

7. A high-stability luminous spherical water-absorbing resin as claimed in claim 1, characterized in that: The crosslinking agent is a compound with multiple double bond groups or a compound with multiple epoxy groups; the compound with multiple double bond groups is one or more of polyethylene glycol di(meth)acrylate, diethylene glycol dimethacrylate, allyl methacrylate, 1,1,1-trimethylolpropane triacrylate, triallylamine, N'N-methylenebisacrylamide, and tetraallyloxyethane; the compound with multiple epoxy groups is one or more of ethylene glycol diglycidyl ether and polyethylene glycol diglycidyl ether.

8. The high-stability luminous spherical water-absorbing resin according to claim 1, characterized in that: The initiator is one or more of azo water-soluble initiators, cerium salts, persulfates, persulfate-NaHSO3 systems, persulfate-organic amine systems, and hydrogen peroxide-ascorbic acid systems; the dispersant is one or more of Tween 80, Tween 85, OP-10, and quaternary ammonium salt dispersants; and the thickener is one or more of cellulose, starch, polyacrylamide, sodium polyacrylate, and polyvinyl alcohol.

9. The high-stability luminous spherical water-absorbing resin according to claim 1, characterized in that: The chelating agent is an aminopolycarboxylic acid compound, including ethylenediaminetetraacetic acid and its sodium salt EDTA; the buffer is disodium hydrogen phosphate-sodium dihydrogen phosphate, dipotassium hydrogen phosphate-potassium dihydrogen phosphate or acrylic acid-sodium acrylate.

10. A method for preparing the high-stability luminous spherical water-absorbing resin as claimed in claim 1, characterized in that: The preparation method comprises the following steps: S1, stirring and mixing water-soluble monomers, alkali, thickener, luminous powder, dispersant, hydrolysis inhibitor, initiator, cross-linking agent, buffer and chelating agent according to a certain weight percentage to obtain a reaction aqueous solution; heating the oil bath in the reaction tower to 50-100° C.; S2, adding the reaction aqueous solution to the storage tank of the droplet former; S3, the reaction aqueous solution passes through the droplet former to form spherical droplets with luminous effect, which enter the reaction tower to perform a polymerization reaction; the spherical droplets settle from the oil bath liquid surface to the bottom of the reaction tower, and after being kept warm for a period of time, the reaction ends to obtain a spherical water-absorbent resin; S4, releasing the spherical water-absorbent resin from the bottom of the reaction tower, filtering and washing to obtain a spherical water-absorbent resin gel with a certain water content and luminous effect; S5, drying the water-containing spherical water-absorbent resin to obtain a spherical water-absorbent resin solid with luminous effect after drying.

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