A modified photoinitiator and a preparation process thereof

Abstract

The application provides a modified photoinitiator and a preparation process thereof, and the modified photoinitiator comprises the following raw materials in parts by weight: 30-60 parts of a photosensitive component, 10-20 parts of a sensitizing component, 10-15 parts of ethanol, 5-10 parts of an assistant initiation component, 4-8 parts of a dispersion component and 2-4 parts of a stabilizing component; wherein the sensitizing component is a rare earth ion complex; the application adds the rare earth ion complex prepared by the reaction of yttrium nitrate, ytterbium nitrate, erbium nitrate and ammonium fluoride as the sensitizing component; the complex inherits the spectral characteristics of the rare earth ion, has strong absorption and emission capacity for light of a specific wavelength; when the rare earth ion complex is excited by enough energy, the energy is transmitted to the surrounding photosensitive component or assistant initiation component through fluorescence emission, thereby improving the light energy capturing capacity of the modified photoinitiator, and thereby initiating a deeper polymerization reaction and enabling deeper penetration into the material to be solidified.

Description

Technical Field

[0001] This invention relates to the field of photoinitiator technology, and in particular to a modified photoinitiator and its preparation process. Background Technology

[0002] Photoinitiators are compounds that absorb energy of a specific wavelength in the ultraviolet or visible light region, generating active fragments such as free radicals and cations, thereby initiating monomer polymerization, cross-linking, and curing. Photoinitiators are a crucial component of UV-curable adhesives, playing a decisive role in the curing rate. Under ultraviolet light irradiation, the photoinitiator absorbs light energy and splits into two active free radicals. These free radicals trigger a chain polymerization reaction between the photosensitive resin and the reactive diluent, causing the adhesive to rapidly cross-link and cure. This process is characterized by its speed, environmental friendliness, and energy efficiency. Photoinitiators have wide applications in various fields, such as UV coatings, UV inks, UV adhesives, electronic packaging materials, optoelectronic display materials, medical device sterilization and coating, biomedical materials, and art reproduction and preservation. However, existing photoinitiators exhibit a significant decrease in their ability to capture light energy in deeper regions, resulting in insufficient deep curing capabilities. Summary of the Invention

[0003] In view of this, the present invention proposes a modified photoinitiator and its preparation process to solve the above problems.

[0004] The technical solution of this invention is implemented as follows:

[0005] A modified photoinitiator comprises the following raw materials in parts by weight: 30-60 parts photosensitizing component, 10-20 parts sensitizing component, 10-15 parts ethanol, 5-10 parts co-initiating component, 4-8 parts dispersing component, and 2-4 parts stabilizing component. The sensitizing component is a rare earth ion complex.

[0006] Further, the rare earth ion complex is prepared by the following method: Rare earth nitrates are dissolved in deionized water at a ratio of 1:(50-100) to obtain a rare earth ion solution. Ammonium fluoride is dissolved in deionized water at a ratio of 1:(10-20) to obtain a ligand solution. The rare earth ion solution and ligand solution are mixed at a ratio of (1.0-1.5):(1.0-2.0) to obtain a reaction solution. The mixture is stirred at 60-90℃ for 3-5 hours. After the reaction is complete, heating is stopped and the mixture is allowed to cool naturally to 20-30℃. Then, a saturated sodium oxalate solution is slowly added dropwise to the reaction solution while stirring until a precipitate forms. The mixture is then allowed to stand for 2-4 hours, and the liquid is filtered off to collect the precipitate. The precipitate is washed 2-3 times with deionized water, and then placed in a drying oven and dried at 60-80℃ to constant weight to obtain the rare earth ion complex.

[0007] Furthermore, a modified photoinitiator comprises the following raw materials in parts by weight: 45 parts photosensitizing component, 15 parts sensitizing component, 12 parts ethanol, 8 parts co-initiating component, 6 parts dispersing component, and 3 parts stabilizing component.

[0008] Furthermore, the rare earth nitrate is composed of yttrium nitrate, ytterbium nitrate, and erbium nitrate in a mass ratio of (75-80):(15-25):(1-3).

[0009] Furthermore, the photosensitizing component is one or a combination of several of the following: benzophenone, 4-methylbenzophenone, 4-chlorobenzophenone, acetophenone, 4-methoxyacetophenone, and 2-hydroxy-2-methylphenylacetone.

[0010] Furthermore, the co-initiating component is one or a combination of several of the following: triethylamine, N,N-dimethylethanolamine, N,N-dimethylbenzylamine, adipate dihydrazide, and ethyl 4-(dimethylamino)benzoate.

[0011] Furthermore, the dispersing component is one or a combination of several of the following: polysorbate 80, ethylene glycol, propylene glycol, glyceryl monostearate, and sorbitan monooleate.

[0012] Furthermore, the stabilizing component is one or a combination of several of the following: 2,6-di-tert-butyl-4-methylphenol, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris(2,4-di-tert-butylphenyl)phosphite, and N-acetylcysteine.

[0013] Furthermore, a preparation process for a modified photoinitiator includes the following steps:

[0014] S1. Add ethanol to the reaction apparatus, then add the photosensitizing component, the initiating component, the dispersing component and the stabilizing component, and stir until completely dissolved to obtain the initial mixture.

[0015] S2. Slowly add the sensitizing component to the initial mixture and stir until homogeneous to obtain the final mixture.

[0016] S3. Place the final mixture into an ultrasonic device for ultrasonic treatment.

[0017] S4. After ultrasonic treatment, the final mixture is placed in a spray drying device for spray drying to obtain the modified photoinitiator.

[0018] Furthermore, in S1, the stirring speed is 200-500 r / min and the stirring time is 40-60 min, while in S2, the stirring speed is 100-300 r / min and the stirring time is 20-40 min.

[0019] Furthermore, in S3, the ultrasonic treatment power is 50-200W, the ultrasonic treatment frequency is 20-40kHz, and the ultrasonic treatment time is 10-20min; in S4, the spray drying temperature is 60-100℃ and the spray pressure is 0.2-0.5MPa.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. This invention utilizes a rare earth ion complex prepared by reacting yttrium nitrate, ytterbium nitrate, erbium nitrate, and ammonium fluoride as a sensitizing component. This complex inherits the spectral characteristics of rare earth ions, exhibiting strong absorption and emission capabilities for specific wavelengths of light. When the rare earth ion complex is excited with sufficient energy, it transmits energy to surrounding photosensitive or co-initiating components through fluorescence emission, thereby enhancing the modified photoinitiator's ability to capture light energy, thus initiating deeper polymerization reactions and enabling deeper penetration into the material to be cured.

[0022] 2. The rare earth ion complex in this invention establishes a stable chemical bond between rare earth ions and fluoride ions through the formation of coordination bonds. This enhances the dispersibility and compatibility of the complex in the modified photoinitiator and reduces the dissociation or precipitation of rare earth ions due to changes in the external environment, thus ensuring the stability of the modified photoinitiator during long-term storage and use. Furthermore, the formation of the complex endows the rare earth ions with a specific spatial configuration and electronic arrangement. This specific structure alters the light absorption and emission characteristics of the rare earth ions, further improving the light utilization efficiency and light energy capture ability of the modified photoinitiator. Detailed Implementation

[0023] To better understand the technical content of this invention, specific embodiments are provided below to further illustrate the invention.

[0024] Unless otherwise specified, the experimental methods used in the embodiments of this invention are all conventional methods.

[0025] Unless otherwise specified, all materials and reagents used in the embodiments of this invention are commercially available.

[0026] Example 1

[0027] A modified photoinitiator comprises the following raw materials in parts by weight: 30 parts photosensitizing component, 10 parts sensitizing component, 10 parts ethanol, 5 parts co-initiating component, 4 parts dispersing component, and 2 parts stabilizing component. The photosensitizing component is benzophenone, the sensitizing component is a rare earth ion complex, the co-initiating component is triethylamine, the dispersing component is polysorbate 80, and the stabilizing component is 2,6-di-tert-butyl-4-methylphenol.

[0028] The rare earth ion complex was prepared by the following method: Rare earth nitrates were dissolved in deionized water at a ratio of 1:50 to obtain a rare earth ion solution. The rare earth nitrates consisted of yttrium nitrate, ytterbium nitrate, and erbium nitrate in a mass ratio of 75:15:1. Ammonium fluoride was dissolved in deionized water at a ratio of 1:10 to obtain a ligand solution. The rare earth ion solution and the ligand solution were mixed at a ratio of 1.0:1.0 to obtain a reaction solution, and stirred at 60°C for 5 hours. After the reaction was complete, heating was stopped, and the solution was allowed to cool naturally to 20°C. A saturated sodium oxalate solution was then slowly added dropwise to the reaction solution while stirring until a precipitate formed. The solution was allowed to stand for 2 hours, and the liquid was filtered off to collect the precipitate. The precipitate was washed twice with deionized water and then placed in a drying oven and dried at 60°C to constant weight to obtain the rare earth ion complex.

[0029] Example 2

[0030] A modified photoinitiator comprises the following raw materials in parts by weight: 60 parts photosensitizing component, 20 parts sensitizing component, 15 parts ethanol, 10 parts co-initiating component, 8 parts dispersing component, and 4 parts stabilizing component. The photosensitizing component consists of 4-methylbenzophenone and acetophenone in a 1:1 mass ratio; the sensitizing component is a rare earth ion complex; the co-initiating component consists of N,N-dimethylethanolamine and ethyl 4-(dimethylamino)benzoate in a 1:1 mass ratio; the dispersing component consists of ethylene glycol and glyceryl monostearate in a 1:1 mass-volume ratio (g / mL); and the stabilizing component consists of 2,6-di-tert-butyl-4-methylphenol and pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] in a 1:1 mass ratio.

[0031] The rare earth ion complex was prepared by the following method: Rare earth nitrates were dissolved in deionized water at a ratio of 1:100 to obtain a rare earth ion solution. The rare earth nitrates consisted of yttrium nitrate, ytterbium nitrate, and erbium nitrate in a mass ratio of 80:25:3. Ammonium fluoride was dissolved in deionized water at a ratio of 1:20 to obtain a ligand solution. The rare earth ion solution and the ligand solution were mixed at a ratio of 1.5:2.0 to obtain a reaction solution, and stirred at 90°C for 3 hours. After the reaction was complete, heating was stopped, and the solution was allowed to cool naturally to 30°C. A saturated sodium oxalate solution was then slowly added dropwise to the reaction solution while stirring until a precipitate formed. The solution was allowed to stand for 4 hours, and the liquid was filtered off to collect the precipitate. The precipitate was washed three times with deionized water and then placed in a drying oven and dried at 80°C to constant weight to obtain the rare earth ion complex.

[0032] Example 3

[0033] A modified photoinitiator comprises the following raw materials in parts by weight: 45 parts photosensitizing component, 15 parts sensitizing component, 12 parts ethanol, 8 parts co-initiating component, 6 parts dispersing component, and 3 parts stabilizing component. The photosensitizing component consists of 4-chlorobenzophenone, 4-methoxyacetophenone, and 2-hydroxy-2-methylphenylacetone in a mass ratio of 1:1:1; the sensitizing component is a rare earth ion complex; the co-initiating component consists of N,N-dimethylbenzylamine and adipate dihydrazide in a volume ratio of 1:1; the dispersing component consists of propylene glycol, glyceryl monostearate, and sorbitan monooleate in a mass-volume ratio of 1:1:1; and the stabilizing component consists of tris(2,4-di-tert-butylphenyl) phosphite and N-acetylcysteine ​​in a mass ratio of 1:1.

[0034] The rare earth ion complex was prepared by the following method: Rare earth nitrates were dissolved in deionized water at a ratio of 1:75 to obtain a rare earth ion solution. The rare earth nitrates consisted of yttrium nitrate, ytterbium nitrate, and erbium nitrate in a mass ratio of 78:20:2. Ammonium fluoride was dissolved in deionized water at a ratio of 1:15 to obtain a ligand solution. The rare earth ion solution and the ligand solution were mixed at a ratio of 1.2:1.5 to obtain a reaction solution, and stirred at 75°C for 4 hours. After the reaction was complete, heating was stopped, and the solution was allowed to cool naturally to 25°C. A saturated sodium oxalate solution was then slowly added dropwise to the reaction solution while stirring until a precipitate formed. The solution was allowed to stand for 3 hours, and the liquid was filtered off to collect the precipitate. The precipitate was washed three times with deionized water and then placed in a drying oven and dried at 70°C to constant weight to obtain the rare earth ion complex.

[0035] The modified photoinitiator described in Examples 1-3 is prepared by the following process, specifically including the following steps:

[0036] S1. Add ethanol to the reaction apparatus, then add the photosensitizing component, the initiating component, the dispersing component and the stabilizing component, and stir at 350 r / min for 50 min until completely dissolved to obtain the initial mixture.

[0037] S2. Slowly add the sensitizing component to the initial mixture and stir at 200 r / min for 30 min to mix evenly to obtain the final mixture.

[0038] S3. Place the final mixture into an ultrasonic device and ultrasonically treat it for 15 minutes under ultrasonic treatment power of 120W and ultrasonic treatment frequency of 30kHz.

[0039] S4. After ultrasonic treatment, the final mixture is placed in a spray drying device and spray dried at a spray drying temperature of 80℃ and a spray pressure of 0.35MPa to obtain the modified photoinitiator.

[0040] Example 4

[0041] Compared with Example 3, the difference in this embodiment is that the modified photoinitiator is prepared by the following process, specifically including the following steps:

[0042] S1. Add ethanol to the reaction apparatus, then add the photosensitizing component, the initiating component, the dispersing component and the stabilizing component, and stir at 200 r / min for 60 min until completely dissolved to obtain the initial mixture.

[0043] S2. Slowly add the sensitizing component to the initial mixture and stir at 100 r / min for 40 min to mix evenly to obtain the final mixture.

[0044] S3. Place the final mixture into an ultrasonic device and ultrasonically treat it for 20 minutes at an ultrasonic power of 50W and an ultrasonic frequency of 20kHz.

[0045] S4. After ultrasonic treatment, the final mixture is placed in a spray drying device and spray dried at a spray drying temperature of 600℃ and a spray pressure of 0.2MPa to obtain the modified photoinitiator.

[0046] Example 5

[0047] Compared with Example 3, the difference in this embodiment is that the modified photoinitiator is prepared by the following process, specifically including the following steps:

[0048] S1. Add ethanol to the reaction apparatus, then add the photosensitizing component, the initiating component, the dispersing component and the stabilizing component, and stir at 500 r / min for 40 min until completely dissolved to obtain the initial mixture.

[0049] S2. Slowly add the sensitizing component to the initial mixture and stir at 300 r / min for 20 min to mix evenly to obtain the final mixture.

[0050] S3. Place the final mixture into an ultrasonic device and ultrasonically treat it for 10 minutes under the conditions of ultrasonic treatment power of 200W and ultrasonic treatment frequency of 40kHz.

[0051] S4. After ultrasonic treatment, the final mixture is placed in a spray drying device and spray dried at a spray drying temperature of 100℃ and a spray pressure of 0.5MPa to obtain the modified photoinitiator.

[0052] Comparative Example 1

[0053] The difference between this comparative example and Example 3 is that the raw materials do not contain sensitizing components.

[0054] Comparative Example 2

[0055] The difference between this comparative example and Example 3 is that the sensitizing component is a rare earth nitrate.

[0056] Comparative Example 3

[0057] The difference between this comparative example and Example 3 is that the raw materials do not contain the co-initiator component.

[0058] I. Depth of Curing

[0059] The modified photoinitiators prepared in Examples 1-5 and Comparative Examples 1-3 were respectively mixed with epoxy resin at a ratio of 5:95 to obtain a mixed adhesive. The mixed adhesive was then placed into cylindrical containers with a diameter of 10 mm and a height of 20 mm, with each container filled to a depth of 15 mm. The containers containing the mixed adhesive were placed directly under a UV lamp at a power of 100 mW / cm². 2 Irradiate the material with light for 60 seconds to cure it, resulting in a cured product. Remove the cured product and remove any incompletely cured portions at the bottom. Measure the height of the cured product with calipers; this is the curing depth. Repeat the above test 5 times and take the average value as the curing depth. The results are shown in Table 1.

[0060] Table 1

[0061]

[0062] Comparing Examples 1-5 with Comparative Examples 1-3 in Table 1, it can be seen that the modified photoinitiator prepared in this application has a better curing depth, especially Example 3, which has a better effect.

[0063] Comparing Example 3 with Comparative Example 1, the rare earth ion complex of the sensitizing component in Example 3 was prepared by reacting yttrium nitrate, ytterbium nitrate, erbium nitrate, and ammonium fluoride. This complex inherits the spectral characteristics of rare earth ions, exhibiting strong absorption and emission capabilities for specific wavelengths of light. When the modified photoinitiator is irradiated, the photosensitive component first absorbs light energy and transitions to an excited state. Subsequently, the excited photosensitive component transfers energy to the rare earth ion complex via energy transfer. Due to the unique optical properties of rare earth ion complexes, they can more effectively absorb and store this energy. When the rare earth ion complex is excited with sufficient energy, it then transfers energy to the surrounding photosensitive component or co-initiator component by emitting fluorescence, thereby improving the modified photoinitiator's ability to capture light energy, thus initiating a deeper polymerization reaction and penetrating the material to be cured more deeply. Simultaneously, the introduction of rare earth ion complexes broadens the absorption spectral range of the modified photoinitiator. Because rare earth ions can absorb and emit light of specific wavelengths, this light may not otherwise be absorbed or utilized by the photosensitive component. Through the energy transfer mechanism of rare earth ion complexes, this originally unused light energy is converted into effective energy that can initiate polymerization reactions, thereby improving the utilization efficiency of light energy and indirectly improving the ability to capture light energy, thus enhancing the deep curing capability.

[0064] Comparing Example 3 with Comparative Example 2, the rare earth ion complex establishes a stable chemical bond between rare earth ions and fluoride ions through the formation of coordination bonds. This enhances the dispersibility and compatibility of the complex in the modified photoinitiator and reduces the dissociation or precipitation of rare earth ions due to changes in the external environment, thus ensuring the stability of the modified photoinitiator during long-term storage and use. Furthermore, the formation of the complex endows the rare earth ions with a specific spatial configuration and electronic arrangement. This specific structure alters the light absorption and emission characteristics of the rare earth ions, further improving the light utilization efficiency and light energy capture ability of the modified photoinitiator. In the rare earth ion complex, the interaction between the rare earth ions and ligands promotes the efficient transfer of energy between the ions and ligands. When the photosensitive component absorbs light energy and transitions to an excited state, this energy is more easily transferred to the rare earth ions through the complex structure, thereby triggering the fluorescence emission of the rare earth ions.

[0065] Comparing Example 3 with Comparative Example 3, Example 3, by adding a co-initiator, can react with the free radicals generated by the photosensitive component to generate more reactive free radicals, thereby accelerating the polymerization reaction. During deep curing, the generation rate of free radicals slows down as light intensity decreases with depth. The presence of the co-initiator can compensate for this deficiency, generating more active free radicals through its reaction with primary free radicals, thus driving the polymerization reaction to deeper levels. The co-initiator can also lower the initiation threshold of the photoinitiator, meaning that polymerization can be initiated at lower light intensities. This is particularly important for deep curing because light intensity gradually decreases with increasing curing depth, and the addition of the co-initiator allows the modified photoinitiator to effectively initiate polymerization even under lower light conditions. Furthermore, during deep curing, the degree of polymer crosslinking may be affected by reduced light intensity and lower free radical concentration. The addition of the co-initiator can compensate for this deficiency by increasing the number of crosslinking points, thereby improving the crosslinking density and mechanical properties of the polymer.

[0066] II. Migration Measurement

[0067] The modified photoinitiators prepared in Examples 1-5 and Comparative Examples 1-3 were mixed with acrylate resin at a ratio of 2:98 to form a uniform coating with a thickness of 2 mm, which was then cured under ultraviolet light. The cured films were ground into powder, and 200 mg of each powder was weighed out and placed in 2 mL of acetonitrile, where it was allowed to stand for 48 h. After 48 h of soaking, the powder was stirred for 3 min, and then filtered to obtain a filtrate. The filtered powder was washed twice with acetonitrile, and the acetonitrile used for washing was poured back into the filtrate, which was then brought to a final volume of 10 mL. The absorbance of the maximum absorption peak of the photoinitiator was measured using a spectrophotometer. The migration rate of the photoinitiator was quantitatively calculated according to Beer-Lambert law. Each sample was tested 5 times, and the average value was recorded as the migration rate in Table 2. The migration rate was calculated using the following formula:

[0068]

[0069] In the formula, A is the absorbance, M is the relative atomic mass of the photoinitiator, V is the total volume of the solution, ε is the molar absorptivity of the photoinitiator in the solution, l is the optical path length, and m0 is the mass of the photoinitiator added to the cured film.

[0070] Table 2

[0071] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Comparative Example 3 % Migration 0.35 0.34 0.31 0.32 0.35 0.53 0.71 0.84

[0072] As shown in Table 2, the modified photoinitiator prepared according to this invention has a low migration rate. This is because the carboxyl groups in the photosensitive component of this invention can undergo esterification with the hydroxyl groups in the resin matrix to form ester bonds, thereby fixing the photosensitive component in the resin matrix. The rare earth ion complexes, as sensitizing components, adhere to the surface of the resin matrix through physical adsorption. Simultaneously, their central ions, such as yttrium, ytterbium, and erbium, form coordination bonds with oxygen-containing and nitrogen-containing ligands in the resin matrix, thereby enhancing the interaction between the complexes and the resin matrix. The rare earth ion complexes also form stable structures with functional groups in the resin matrix through their multidentate ligand structures, further contributing to the fixation of the complexes in the resin matrix. The co-initiating component accelerates the diffusion and propagation of free radicals in the resin matrix, allowing the polymerization reaction to occur more uniformly throughout the entire resin matrix, contributing to the formation of a denser and more stable resin network structure, thus limiting the migration of the modified photoinitiator molecules.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modified photoinitiator, characterized in that, The raw materials comprise the following parts by weight: 30-60 parts photosensitizing component, 10-20 parts sensitizing component, 10-15 parts ethanol, 5-10 parts co-initiating component, 4-8 parts dispersing component, and 2-4 parts stabilizing component. The sensitizing component is a rare earth ion complex, which is prepared by the following method: dissolving a rare earth nitrate in deionized water at a ratio of 1:(50-100) to obtain a rare earth ion solution; dissolving ammonium fluoride in deionized water at a ratio of 1:(10-20) to obtain a ligand solution; and further dissolving the rare earth ion complex... The liquid and ligand solution were mixed at a ratio of (1.0-1.5):(1.0-2.0) to obtain a reaction solution. The mixture was stirred at 60-90℃ for 3-5 hours. After the reaction was completed, heating was stopped and the mixture was allowed to cool naturally to 20-30℃. Then, a saturated sodium oxalate solution was slowly added dropwise to the reaction solution while stirring until a precipitate appeared. The precipitate was then allowed to stand for 2-4 hours. The liquid was then filtered off and the precipitate was collected. The precipitate was washed 2-3 times with deionized water and then placed in a drying oven and dried at 60-80℃ to constant weight to obtain the rare earth ion complex. The rare earth nitrate is composed of yttrium nitrate, ytterbium nitrate, and erbium nitrate in a mass ratio of (75-80):(15-25):(1-3); The photosensitive component is one or a combination of several of the following: benzophenone, 4-methylbenzophenone, 4-chlorobenzophenone, acetophenone, 4-methoxyacetophenone, and 2-hydroxy-2-methylphenylacetone.

2. The modified photoinitiator as described in claim 1, characterized in that, It includes the following raw materials in parts by weight: 45 parts photosensitizing component, 15 parts sensitizing component, 12 parts ethanol, 8 parts co-initiating component, 6 parts dispersing component, and 3 parts stabilizing component.

3. The modified photoinitiator as described in claim 1, characterized in that, The co-initiating component is one or a combination of several of the following: triethylamine, N,N-dimethylethanolamine, N,N-dimethylbenzylamine, adipate dihydrazide, and ethyl 4-(dimethylamino)benzoate.

4. The modified photoinitiator as described in claim 1, characterized in that, The dispersion component is one or a combination of several of the following: polysorbate 80, ethylene glycol, propylene glycol, glyceryl monostearate, and sorbitan monooleate.

5. A modified photoinitiator as described in claim 1, characterized in that, The stabilizing component is one or a combination of several of the following: 2,6-di-tert-butyl-4-methylphenol, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris(2,4-di-tert-butylphenyl)phosphite, and N-acetylcysteine.

6. The preparation process of a modified photoinitiator according to any one of claims 1-5, characterized in that, Includes the following steps: S1. Add ethanol to the reaction apparatus, then add the photosensitizing component, the co-initiating component, the dispersing component and the stabilizing component, and stir until completely dissolved to obtain the initial mixture; S2. Slowly add the sensitizing component to the initial mixture and stir until homogeneous to obtain the final mixture; S3. Place the final mixture into an ultrasonic device for ultrasonic treatment; S4. After ultrasonic treatment, the final mixture is placed in a spray drying device for spray drying to obtain the modified photoinitiator.

7. The preparation process of the modified photoinitiator as described in claim 6, characterized in that, In S1, the stirring speed is 200-500 r / min and the stirring time is 40-60 min; in S2, the stirring speed is 100-300 r / min and the stirring time is 20-40 min.

8. The preparation process of the modified photoinitiator as described in claim 6, characterized in that, In step S3, the ultrasonic processing power is 50-200W, the ultrasonic processing frequency is 20-40kHz, and the ultrasonic processing time is 10-20min. In step S4, the spray drying temperature is 60-100℃ and the spray pressure is 0.2-0.5MPa.

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