Water dispersion type 123 light stabilizer as well as preparation method and application thereof

Abstract

The invention discloses a water dispersible 123 light stabilizer which comprises the following components in percentage by mass: 40-60% of a light stabilizer 123, 10-20% of a nonionic emulsifier, 5-15% of an anionic emulsifier, 5-10% of sodium carboxymethyl cellulose and 2-5% of a phosphite antioxidant, and a pH regulator is used for regulating the pH value of a system to 7-9. The preparation method comprises the following steps: premixing, emulsifying and dispersing, homogenizing, and adjusting the pH value to obtain the water-dispersible 123 light stabilizer product. The light resistance of the material can be effectively improved; due to the water dispersion type, the water-based dispersing agent has good dispersity and can be more uniformly distributed in a water-based system, so that the quality stability of a product is improved; compared with some traditional light stabilizers, the stabilizer can be more conveniently applied to a water-based formula system, is beneficial to development of environment-friendly materials, plays a positive role in the fields of water-based paint, water-based ink and the like, and reduces the problem of material performance reduction caused by photochemical degradation.

Description

Technical Field

[0001] The present invention relates to the technical field of light stabilizers, and in particular to a method for preparing a water-dispersible 123 light stabilizer and application thereof in a water-based material system to improve the light stability of the water-based material. Background Art

[0002] With the increasing requirements for environmental protection, water-based materials are increasingly used in coatings, inks, adhesives and other fields. However, when used outdoors, these water-based materials are susceptible to light aging due to ultraviolet radiation, resulting in performance degradation and changes in appearance. Most existing light stabilizers are designed for oily systems, and have problems such as poor dispersibility and poor compatibility in water-based systems. Therefore, it is of great significance to develop a light stabilizer suitable for water-based systems. Water-dispersible 123 light stabilizer is a new type of light stabilizer developed to meet this demand. Summary of the invention

[0003] The purpose of the present invention is to provide a water-dispersible 123 light stabilizer and a preparation method and application thereof, so as to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: The present invention provides a water-dispersible 123 light stabilizer, which comprises the following components by mass percentage: 40%-60% of light stabilizer 123, 10%-20% of nonionic emulsifier, 5%-15% of anionic emulsifier, 5%-10% of sodium carboxymethyl cellulose, 2%-5% of phosphite antioxidant, and a pH regulator for adjusting the pH value to 7-9, wherein the pH regulator is ammonia water or sodium hydroxide solution.

[0005] Furthermore, the nonionic emulsifier is one or more of Spans, Tweens, poloxamers, sucrose stearate, benzyl alcohol, and oleate; the anionic emulsifier is one or more of sodium lauryl sulfate, stearate, and oleate; and the phosphite antioxidant is triphenyl phosphite.

[0006] The present invention also provides a method for preparing the water-dispersible 123 light stabilizer as described above, comprising the following steps: S01, premixing: according to the mass percentage of claim 1, add light stabilizer 123, nonionic emulsifier, anionic emulsifier, sodium carboxymethyl cellulose and phosphite antioxidant into a high-speed stirring kettle, and stir at a speed of 600-1000 rpm for 10-20 minutes to form a uniform mixing system; S02. Slowly add deionized water to the mixed system under continuous stirring, increase the stirring speed to 1500-2500 rpm, and stir for 20-30 minutes to form a preliminary emulsion; S03, transferring the preliminary emulsion to a high-pressure homogenizer, and homogenizing it 3-5 times at a pressure of 50-100 MPa to obtain a uniform and stable water-dispersible 123 light stabilizer emulsion; S04. Add a pH adjuster to the homogenized water-dispersible 123 light stabilizer emulsion, slowly adjust the pH value to 7-9, and then keep stirring at 40-60° C. for 1-2 hours to obtain a water-dispersible 123 light stabilizer.

[0007] Furthermore, in step S02, the mass of deionized water is 30%-50% of the total mass of the mixed system.

[0008] Furthermore, in step S03, the D50 particle size of the light stabilizer 123 in the water-dispersible 123 light stabilizer emulsion is 1-10 μm.

[0009] The present invention also provides a use of the water-dispersible 123 light stabilizer as described above in a water-based coating, wherein the mass of the water-dispersible 123 light stabilizer is 2%-6% of the mass of the water-based coating.

[0010] The present invention also provides a use of the water-dispersible 123 light stabilizer as described above in water-based ink, wherein the mass of the water-dispersible 123 light stabilizer is 1%-5% of the mass of the water-based ink.

[0011] The present invention also provides a use of the water-dispersible 123 light stabilizer as described above in a water-based adhesive, wherein the mass of the water-dispersible 123 light stabilizer is 3%-8% of the mass of the water-based adhesive.

[0012] Compared with the prior art, the present invention has the following beneficial effects: Compared with the prior art, the water-based 123 light stabilizer of the present invention has many beneficial effects. First, water-based significantly reduces the emission of volatile organic compounds (VOC). Traditional related products often rely on organic solvents, which will release a large amount of VOCs during production and use, causing pollution to the environment and endangering human health. Water-based greatly reduces this source of pollution, helps to improve air quality, meets the increasingly stringent environmental protection regulations, and promotes the development of related industries in a green and sustainable direction. Second, water-based gives the product better safety. Organic solvents usually have dangerous characteristics such as flammable and explosive, and the water-based system greatly reduces this safety risk. It is safer and more reliable in production, storage, transportation and application scenarios, reducing the possibility of safety accidents such as fire hazards, providing operators with a safer working environment, and reducing the cost and management difficulty of enterprises in safety protection. Third, water-based 123 products perform better in certain performance aspects. For example, it may have stronger adhesion to the substrate, and can better penetrate and adhere to the surfaces of different materials to form a more stable and uniform coating or film layer, thereby improving the durability and protective properties of the product and extending its service life. In some applications, water-based coatings may also improve key performance indicators such as the product's flexibility and water resistance, broaden its applicability in different fields and working conditions, and meet more diverse market demands.

[0013] The water-dispersible 123 light stabilizer of the present invention can effectively improve the light resistance of the material. In outdoor environments, materials such as plastic products and coatings are easily damaged by ultraviolet rays. It can absorb or shield ultraviolet rays and slow down the light aging process of the material. For example, when used in plastic pipes, it can extend the service life of the pipes. Moreover, it is water-dispersible, which gives it good dispersibility and allows it to be more evenly distributed in the aqueous system, thereby improving the stability of product quality. Compared with some traditional light stabilizers, this stabilizer can be more conveniently used in aqueous formulation systems, contributes to the development of environmentally friendly materials, plays a positive role in the fields of water-based coatings and water-based inks, and reduces the problem of material performance degradation caused by photochemical degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the particle size distribution diagram of the water-dispersible 123 light stabilizer in Example 1; Figure 2 This is the particle size distribution diagram of the water-dispersible 123 light stabilizer of Example 2; Figure 3 This is the particle size distribution diagram of the water-dispersible 123 light stabilizer of Example 3; Figure 4 This is the particle size distribution diagram of the water-dispersible 123 light stabilizer of Example 4; Figure 5 This is the particle size distribution diagram of the water-dispersible 123 light stabilizer of Example 5; Figure 6 This is the particle size distribution diagram of the water-dispersible 123 light stabilizer of Example 6; Figure 7 This is the particle size distribution diagram of the water-dispersible 123 light stabilizer of Example 7. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] The present invention provides a water-dispersible 123 light stabilizer and a preparation method and application thereof.

[0017] 1. Raw material preparation Light stabilizer 123: High-purity (≥98%) light stabilizer 123 is selected. It has a unique chemical structure, can effectively absorb ultraviolet rays and inhibit the generation of free radicals. It is the core active ingredient of the present invention, and its mass fraction accounts for 40%-60% of the total raw materials. Light stabilizer 123 is a highly efficient low molecular weight non-alkaline liquid hindered amine stabilizer. Its chemical name is bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate, CAS number is 129757-67-1, and its appearance is a slightly yellow viscous liquid. It has many advantages, such as strong stability, and it can still maintain good performance when in contact with corrosive substances such as acids and flame retardants; it has good compatibility and can be mixed and added with a variety of substrates and other additives; it is weakly alkaline and is suitable for special systems containing acidic substances. It has a wide range of applications, covering coatings such as automotive coatings, industrial coatings, decorative coatings, wood coatings, as well as polymer materials such as acrylic acid, polyurethane sealants, rubber, and also includes adhesives, sealants, etc. It can effectively prevent aging phenomena such as material loss of gloss, cracking, and blistering, and extend the service life. The generally recommended dosage is between 0.05% and 2.0%. It can produce a synergistic effect when used in combination with ultraviolet absorbers to achieve better light stabilization effects.

[0018] Emulsifier system: It is composed of nonionic emulsifier and anionic emulsifier. Nonionic emulsifiers can be selected from Span (fatty acid sorbitan), Tween (polysorbate), Poloxamer (Pluronic F68), sucrose stearate, benzyl, and methoxybenzyl, etc., with a mass fraction of 10%-20%; anionic emulsifiers can be selected from sodium dodecyl sulfate, stearate, oleate, etc., with a mass fraction of 5%-15%. The synergistic effect of the two emulsifiers can reduce the oil-water interfacial tension and make the light stabilizer 123 evenly dispersed in water. Emulsifiers are a type of substance that can form a stable emulsion from a mixed liquid of two or more immiscible components. Its working principle is that during the emulsification process, the dispersed phase is dispersed in the continuous phase in the form of droplets (micrometer level), and the emulsifier reduces the interfacial tension of each component in the mixed system and forms a relatively strong film on the surface of the droplets or forms a double electric layer on the surface of the droplets due to the charge given by the emulsifier, preventing the droplets from aggregating with each other and maintaining a uniform emulsion. The HLB values ​​of various emulsifiers are different. In order to obtain a stable emulsion, a suitable emulsifier must be selected.

[0019] Dispersing aid: Sodium carboxymethyl cellulose is used with a mass fraction of 5%-10%. It can increase the suspension stability of light stabilizer particles in water and prevent particle agglomeration.

[0020] Antioxidant: Add an appropriate amount of phosphite antioxidant (such as triphenyl phosphite) with a mass fraction of 2%-5% to prevent the light stabilizer from reducing its activity due to oxidation during the preparation and storage process.

[0021] pH adjuster: Ammonia water or sodium hydroxide solution is selected as the pH adjuster to adjust the pH value of the system to 7-9 to ensure the stability of the light stabilizer in an aqueous environment.

[0022] Preparation steps S01, premixing: add light stabilizer 123 matrix, nonionic emulsifier, anionic emulsifier, dispersing aid and antioxidant into a high-speed stirring kettle according to the proportion, stir at a speed of 600-1000rpm for 10-20 minutes to fully mix the solid powder and liquid to form a uniform mixing system.

[0023] S02. Emulsification and dispersion: Deionized water is slowly added to the mixed system under continuous stirring, and the amount of deionized water added is 30%-50% of the total system mass. At the same time, the stirring speed is increased to 1500-2500rpm, and stirred for 20-30 minutes to gradually disperse the light stabilizer 123 in the water under the action of the emulsifier to form a preliminary emulsion.

[0024] S03. Homogenization: Transfer the preliminary emulsion to a high-pressure homogenizer and perform homogenization for 3-5 times at a pressure of 50-100 MPa to further refine the light stabilizer particles in the emulsion and make the particle size reach the micron level (1-10 microns), thus obtaining a uniform and stable water-dispersible 123 light stabilizer emulsion.

[0025] S04, pH adjustment and stabilization: Add pH adjuster to the homogenized emulsion, slowly adjust the pH value to 7-9, and then keep stirring at 40-60°C for 1-2 hours to make the emulsion system more stable, and finally obtain a water-dispersible 123 light stabilizer product.

[0026] (II) Application of water-dispersible 123 light stabilizer 1. Application in water-based coatings 1. Paint preparation: In the preparation process of water-based paint, water-dispersible 123 light stabilizer can be added during the paint grinding stage or the final paint mixing stage. The addition amount is 2%-6% of the total weight of the paint. For example, in water-based acrylic paint, when the addition amount is 4%, the light stabilizer can be evenly dispersed in the paint system without affecting the rheological properties and construction performance of the paint.

[0027] 2. Performance improvement: After the water-based paint with the addition of this light stabilizer was subjected to an accelerated aging test under ultraviolet irradiation (according to ASTM G154 standard, using UVA-340 lamps, irradiance of 0.89W / m², and irradiation time of 1000 hours), the gloss retention rate was increased by 30%-50% compared with the paint without the addition of light stabilizer, and the color difference change (ΔE) was less than 3, which significantly improved the light aging resistance of the paint, allowing the paint to maintain a good appearance and protective performance when used outdoors for a long time.

[0028] 2. Application in water-based ink 1. Ink formula adjustment: In the production process of water-based ink, add water-dispersible 123 light stabilizer to the ink formula at a ratio of 1%-5% of the total mass of the ink. In water-based flexographic ink or gravure ink, the light stabilizer can be well compatible with the pigment, resin and other components in the ink.

[0029] 2. Effects: After outdoor exposure tests (such as placing under direct sunlight for 6 months), the samples printed with water-based inks containing this light stabilizer have good color vividness and clarity, and the degree of fading is significantly lower than that of samples printed with inks without light stabilizers, which improves the quality and durability of printed products.

[0030] 3. Application in water-based adhesives 1. Adhesive production: When preparing water-based adhesives, add water-dispersible 123 light stabilizers in the late stage of adhesive synthesis or in the preparation stage, and the addition amount is 3%-8% of the total weight of the adhesive. For example, in water-based polyurethane adhesives, the light stabilizer can be evenly distributed in the adhesive system without affecting the adhesive's bonding properties.

[0031] 2. Application effect: For materials bonded with water-based adhesives that add this light stabilizer, the adhesive's bonding strength retention rate is higher when used outdoors or in long-term light environments, which can effectively prevent bonding failures caused by light aging and extend the service life of the bonded structure. Example 1

[0032] Material preparation Light stabilizer 123 50g (purity 99%), polyoxyethylene sorbitan fatty acid ester (Tween-60) 15g, sodium dodecylbenzene sulfonate 10g, sodium carboxymethyl cellulose 8g, triphenyl phosphite 3g, and appropriate amount of ammonia water.

[0033] Preparation process Add light stabilizer 123, Tween-60, sodium dodecylbenzene sulfonate, sodium carboxymethyl cellulose and triphenyl phosphite into a high-speed stirring kettle and stir at 800rpm for 15 minutes. Then slowly add 40g of deionized water, increase the speed to 2000rpm, and stir for 25 minutes. Then transfer the emulsion to a high-pressure homogenizer and homogenize it 4 times at a pressure of 80MPa. Finally, add ammonia water to adjust the pH value to 8, and keep stirring at 50℃ for 1.5 hours to obtain a water-dispersible light stabilizer 123. Its particle size distribution diagram is as follows: Figure 1 As shown, the D50 particle size of the water-dispersible 123 light stabilizer is 1.879 μm.

[0034] Application Testing ① Application of water-based coatings: The light stabilizer was added to water-based acrylic coatings at a mass fraction of 5%. After an accelerated aging test of 3000h under ultraviolet irradiation (conditions as above), the gloss retention rate increased by 40%, the color difference change (ΔE) was 2.5, and there was no obvious powdering and cracking on the coating surface.

[0035] ② Application of water-based ink: Add light stabilizer to water-based flexographic ink at a mass fraction of 3%. After 6 months of outdoor exposure test, the color vividness of the printed pattern remains good and fading is not obvious.

[0036] ③ Application of water-based adhesive: Add 6% light stabilizer to water-based polyurethane adhesive. After the adhesive material is used in outdoor lighting environment for 12 months, the bonding strength retention rate is 90%, and no bonding failure occurs. Example 2

[0037] Material preparation Light stabilizer 123 45g (purity 98.5%), polyoxyethylene sorbitan fatty acid ester (Tween-20) 12g, sodium dodecylbenzene sulfonate 8g, sodium carboxymethyl cellulose 6g, triphenyl phosphite 2g, and appropriate amount of sodium hydroxide solution.

[0038] Preparation process According to the preparation steps, light stabilizer 123, polyoxyethylene sorbitan fatty acid ester (Tween-20), sodium dodecylbenzene sulfonate, sodium carboxymethyl cellulose, and triphenyl phosphite were added to a high-speed stirring kettle, premixed at 700 rpm for 12 minutes, added with 35 g of deionized water, stirred at 1800 rpm for 22 minutes, homogenized 3 times at 60 MPa pressure, adjusted the pH value to 7.5 with sodium hydroxide solution, and stirred at 45°C for 1 hour to obtain a water-dispersible light stabilizer 123. Its particle size distribution diagram is as follows: Figure 2 As shown, the D50 particle size of the water-dispersible 123 light stabilizer is 2.663 μm.

[0039] Application Testing ① Application of water-based coatings: Add light stabilizer to water-based epoxy coatings at a mass fraction of 3%. After the aging test accelerated by ultraviolet irradiation for 3000 hours, the gloss retention rate increased by 32%, the color difference change (ΔE) was 2.8, and the light aging resistance of the coating was significantly improved.

[0040] ② Application of water-based ink: Add 2% by mass to water-based gravure ink. After 6 months of outdoor exposure, the clarity and color of the printed pattern remain good, and the degree of fading is reduced.

[0041] ③ Application of water-based adhesive: Add 5% light stabilizer to water-based acrylic adhesive. Under outdoor lighting conditions, the bonded structure still maintains good bonding performance after 10 months, and the bonding strength retention rate is 88%. Example 3

[0042] Material preparation Light stabilizer 123 45g (purity 98.5%), PEG-400 monostearate 6g, Span S-20 6g, sodium dodecyl sulfate 8g, sodium carboxymethyl cellulose 11g, triphenyl phosphite 2g, and appropriate amount of sodium hydroxide solution.

[0043] Preparation process According to the preparation steps, light stabilizer 123, PEG-400 monostearate, Span S-20, sodium lauryl sulfate, sodium carboxymethyl cellulose, and triphenyl phosphite were added to a high-speed stirring kettle, premixed at 700 rpm for 12 minutes, added with 35 g of deionized water, stirred at 1800 rpm for 22 minutes, homogenized 3 times at 60 MPa pressure, adjusted the pH value to 7.5 with sodium hydroxide solution, and stirred at 45°C for 1 hour to obtain a water-dispersible light stabilizer 123. Its particle size distribution diagram is as follows: Figure 3 As shown, the D50 particle size of the water-dispersible 123 light stabilizer is 2.294 μm.

[0044] Application Testing ① Application of water-based coatings: Add light stabilizer to water-based epoxy coatings at a mass fraction of 3%. After 3000h accelerated aging test under ultraviolet irradiation, the gloss retention rate increased by 50%, the color difference change (ΔE) was 2.0, and the light aging resistance of the coating was significantly improved.

[0045] ② Application of water-based ink: Add 2% by mass to water-based gravure ink. After 6 months of outdoor exposure, the clarity and color of the printed pattern remain good, and the degree of fading is reduced.

[0046] ③ Application of water-based adhesive: Add 5% light stabilizer to water-based acrylic adhesive. Under outdoor lighting conditions, the bonded structure still maintains good bonding performance after 10 months, and the bonding strength retention rate is 90%. Example 4

[0047] Material preparation Light stabilizer 123 45g (purity 98.5%), Solvay CM30, ES2816 6g each, Span S-20 6g, sodium dodecylbenzene sulfonate 8g, sodium carboxymethyl cellulose 11g, triphenyl phosphite 2g, and appropriate amount of sodium hydroxide solution.

[0048] Preparation process According to the preparation steps, light stabilizer 123, Solvay CM30, ES2816, Span S-20, sodium dodecylbenzene sulfonate, sodium carboxymethyl cellulose, and triphenyl phosphite were added to a high-speed stirring kettle, premixed at 700 rpm for 12 minutes, added with 35 g of deionized water, stirred at 1800 rpm for 22 minutes, homogenized 3 times at 60 MPa pressure, adjusted the pH value to 7.5 with sodium hydroxide solution, and stirred at 45°C for 1 hour to obtain a water-dispersible light stabilizer 123. Its particle size distribution diagram is as follows: Figure 1 As shown, the D50 particle size of the water-dispersible 123 light stabilizer is 2.562 μm.

[0049] Application Testing ① Application of water-based coatings: Add light stabilizer to water-based epoxy coatings at a mass fraction of 3%. After the 3000h accelerated aging test under ultraviolet irradiation, the gloss retention rate increased by 20%, the color difference change (ΔE) was 2.9, and the light aging resistance of the coating was significantly improved.

[0050] ② Application of water-based ink: Add 2% by mass to water-based gravure ink. After 6 months of outdoor exposure, the clarity and color of the printed pattern remain good, and the degree of fading is reduced.

[0051] ③ Application of water-based adhesive: Add 5% light stabilizer to water-based acrylic adhesive. Under outdoor lighting conditions, the bonded structure still maintains good bonding performance after 10 months, and the bonding strength retention rate is 90%.

[0052] It can be seen from the above examples that the water-dispersible 123 light stabilizer of the present invention has excellent light stabilization effect in the fields of water-based coatings, inks and adhesives, can effectively improve the light aging resistance and service life of the products, and has broad application prospects. Example 5

[0053] Material preparation Light stabilizer 123 70g (purity 98.5%), hexadecyltrimethylammonium bromide 25g, sodium carboxymethyl cellulose 11g, triphenyl phosphite 2g, and appropriate amount of sodium hydroxide solution.

[0054] Preparation process According to the preparation steps, light stabilizer 123, hexadecyltrimethylammonium bromide, sodium carboxymethylcellulose, and triphenyl phosphite were added to a high-speed stirring kettle, premixed at 700 rpm for 12 minutes, added with 35 g of deionized water, stirred at 1800 rpm for 22 minutes, homogenized 3 times at 60 MPa pressure, adjusted the pH value to 7.5 with sodium hydroxide solution, and stirred at 45°C for 1 hour to obtain a water-dispersible light stabilizer 123. The particle size distribution diagram of the water-dispersible light stabilizer 123 using a cationic emulsifier in this embodiment is shown in FIG. Figure 5 As shown, the D50 particle size of the water-dispersible 123 light stabilizer is 42.50 μm.

[0055] Application Testing Application of water-based coatings: Add light stabilizer to water-based epoxy coating at a mass fraction of 3%. After standing for one month, the coating showed obvious stratification. After an accelerated aging test under ultraviolet irradiation for 3000 hours, the color difference change (ΔE) was 6.9, which was a relatively large change.

[0056] The comparative example exceeds the particle size range of the water-dispersible 123, and has problems such as agglomeration and a significant decrease in photostability efficiency, which in turn proves the scientific nature and necessity of the parameters and compound selection of this application. Example 6

[0057] Material preparation Light stabilizer 123 70g (purity 98.5%), Tween-60 25g, sodium carboxymethyl cellulose 11g, triphenyl phosphite 2g, and appropriate amount of sodium hydroxide solution.

[0058] Preparation process According to the preparation steps, light stabilizer 123, Tween-60, sodium carboxymethyl cellulose, and triphenyl phosphite were added to a high-speed stirring kettle, premixed at 700 rpm for 12 minutes, added with 35 g of deionized water, stirred at 1800 rpm for 22 minutes, homogenized 3 times at 60 MPa pressure, adjusted the pH value to 7.5 with sodium hydroxide solution, and stirred at 45°C for 1 hour to obtain a water-dispersible 123 light stabilizer. The particle size distribution of the water-dispersible 123 light stabilizer using a single anionic emulsifier in this embodiment is shown in FIG. Figure 6 As shown, the D50 particle size of the water-dispersible 123 light stabilizer is 18.77 μm.

[0059] Application Testing Application of water-based coatings: When the light stabilizer is added to the water-based epoxy coating at a mass fraction of 3% and left to stand for 2 months, the coating shows obvious stratification. After an accelerated aging test of 3000h under ultraviolet irradiation, the color difference change (ΔE) is 5.9, which is a relatively large change. Example 7

[0060] Material preparation Light stabilizer 123 45g (purity 98.5%), Solvay CM30, ES2816 6g each, Span S-20 6g, sodium dodecylbenzene sulfonate 8g, sodium carboxymethyl cellulose 11g, triphenyl phosphite 2g, and appropriate amount of sodium hydroxide solution.

[0061] Preparation process According to the preparation steps, light stabilizer 123, Solvay CM30, ES2816, Span S-20, sodium dodecylbenzene sulfonate, sodium carboxymethyl cellulose, and triphenyl phosphite were added to a high-speed stirring kettle, premixed at 700 rpm for 12 minutes, added with 35 g of deionized water, stirred at 1800 rpm for 22 minutes, adjusted the pH value to 7.5 with sodium hydroxide solution, and stirred at 45°C for 1 hour to obtain a water-dispersible light stabilizer 123. The particle size distribution of the water-dispersible light stabilizer 123 in this embodiment without high-pressure homogenization is shown in the figure below: Figure 7 As shown, the D50 particle size of the water-dispersible 123 light stabilizer is 8.933 μm and the D90 particle size is 47.11 μm, and the distribution is uneven.

[0062] Application Testing Application of water-based coatings: Add light stabilizer to water-based epoxy coating at a mass fraction of 3%. After standing for half a month, the coating showed obvious stratification. After an accelerated aging test under ultraviolet irradiation for 3000 hours, the color difference change (ΔE) was 6.7, which was a relatively large change.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0064] It should be noted that the above content only illustrates the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims

1. A water-dispersible 123 light stabilizer, characterized in that: The composition includes the following components by mass percentage: 40%-60% light stabilizer 123, 10%-20% nonionic emulsifier, 5%-15% anionic emulsifier, 5%-10% sodium carboxymethyl cellulose, 2%-5% phosphite antioxidant, and pH adjuster for adjusting the pH value to 7-9, wherein the pH adjuster is ammonia water or sodium hydroxide solution.

2. A water-dispersible 123 light stabilizer according to claim 1, characterized in that: The nonionic emulsifier is one or more of Spans, Tweens, poloxamers, sucrose stearate, benzyl alcohol, and sodium oleate; the anionic emulsifier is one or more of sodium lauryl sulfate, stearate, and oleate; and the phosphite antioxidant is triphenyl phosphite.

3. A method for preparing a water-dispersible 123 light stabilizer as claimed in any one of claims 1 to 2, characterized in that: The following steps are involved: S01, premixing: according to the mass percentage of claim 1, add light stabilizer 123, nonionic emulsifier, anionic emulsifier, sodium carboxymethyl cellulose and phosphite antioxidant into a high-speed stirring kettle, and stir at a speed of 600-1000 rpm for 10-20 minutes to form a uniform mixing system; S02. Slowly add deionized water to the mixed system under continuous stirring, increase the stirring speed to 1500-2500 rpm, and stir for 20-30 minutes to form a preliminary emulsion; S03, transferring the preliminary emulsion to a high-pressure homogenizer, and homogenizing it 3-5 times at a pressure of 50-100 MPa to obtain a uniform and stable water-dispersible 123 light stabilizer emulsion; S04. Add a pH adjuster to the homogenized water-dispersible 123 light stabilizer emulsion, slowly adjust the pH value to 7-9, and then keep stirring at 40-60° C. for 1-2 hours to obtain a water-dispersible 123 light stabilizer.

4. The method for preparing a water-dispersible 123 light stabilizer according to claim 3, characterized in that: In step S02, the mass of deionized water is 30%-50% of the total mass of the mixed system.

5. The method for preparing a water-dispersible 123 light stabilizer according to claim 3, characterized in that: In step S03, the D of the light stabilizer 123 in the water-dispersible 123 light stabilizer emulsion is 50 The particle size is 1-10μm.

6. Use of the water-dispersible 123 light stabilizer according to any one of claims 1 to 2 in water-based coatings, characterized in that: The mass of the water-dispersible 123 light stabilizer is 2%-6% of the mass of the water-based coating.

7. A use of the water-dispersible 123 light stabilizer according to any one of claims 1 to 2 in water-based ink, characterized in that: The mass of the water-dispersible 123 light stabilizer is 1%-5% of the mass of the water-based ink.

8. Use of the water-dispersible 123 light stabilizer according to any one of claims 1 to 2 in a water-based adhesive, characterized in that: The mass of the water-dispersible 123 light stabilizer is 3%-8% of the mass of the water-based adhesive.

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