Modified photoinitiator and preparation process thereof

Abstract

The invention provides a modified photoinitiator and a preparation process thereof. 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 initiation assisting component, 4-8 parts of a dispersing component and 2-4 parts of a stabilizing component. Wherein the sensitizing component is a rare earth ion complex. According to the invention, the rare earth ion complex prepared by reacting yttrium nitrate, ytterbium nitrate, erbium nitrate and ammonium fluoride is added as a sensitizing component, and the complex inherits the spectral characteristics of rare earth ions and has relatively strong absorption and emission capability on light with specific wavelength. And when the rare earth ion complex is excited by enough energy, the energy is transmitted to the surrounding photosensitive component or auxiliary initiation component by emitting fluorescence, so that the capability of capturing light energy of the modified photoinitiator is improved, deeper polymerization reaction is initiated, and a to-be-cured material can be deeply penetrated.

Description

Technical Field

[0001] The invention relates to the technical field of photoinitiators, and in particular to a modified photoinitiator and a preparation process thereof. Background Art

[0002] Photoinitiators are a class of compounds that can absorb energy of a certain wavelength in the ultraviolet or visible light region, produce free radicals, cations and other active fragments, and thus initiate monomer polymerization, cross-linking and curing. Photoinitiators are one of the important components of photocurable adhesives and play a decisive role in the curing rate. Under ultraviolet light, photoinitiators absorb light energy and split into two active free radicals, which trigger a chain polymerization reaction of photosensitive resins and active diluents, causing the adhesive to cross-link and cure rapidly. This process is characterized by being fast, environmentally friendly and energy-saving. Photoinitiators are widely used in many fields, such as UV coatings, UV inks, UV adhesives, electronic packaging materials, optoelectronic display materials, medical device disinfection and coatings, biomedical materials, artwork reproduction and protection, etc. However, the ability of existing photoinitiators to capture light energy in deep areas will be significantly reduced, resulting in insufficient deep curing ability. Summary of the invention

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

[0004] The technical solution of the present invention is achieved in this way:

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

[0006] Furthermore, the rare earth ion complex is prepared by the following method: rare earth nitrate is dissolved in deionized water at a material-liquid ratio of 1: (50-100) to obtain a rare earth ion solution. Ammonium fluoride is dissolved in deionized water at a material-liquid ratio of 1: (10-20) to obtain a ligand solution. The rare earth ion solution and the ligand solution are mixed at a ratio of (1.0-1.5): (1.0-2.0) to obtain a reaction solution, and the reaction is stirred at 60-90°C for 3-5h. After the reaction is completed, heating is stopped and the reaction is naturally cooled to 20-30°C, and then a saturated sodium oxalate solution is slowly added to the reaction solution while stirring until a precipitate appears, and then the solution is allowed to stand for 2-4h, and then the liquid is filtered to obtain the precipitate. The precipitate is washed 2-3 times with deionized water, and then the precipitate is placed in a drying oven and dried to constant weight at 60-80°C to obtain a rare earth ion complex.

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

[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 photosensitive component is one or a combination of benzophenone, 4-methylbenzophenone, 4-chlorobenzophenone, acetophenone, 4-methoxyacetophenone, and 2-hydroxy-2-methylpropiophenone.

[0010] Furthermore, the auxiliary initiator component is one or a combination of triethylamine, N,N-dimethylethanolamine, N,N-dimethylbenzylamine, adipic acid dihydrazide, and ethyl 4-(dimethylamino)benzoate.

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

[0012] Furthermore, the stabilizing component is one or a combination of 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 process for preparing a modified photoinitiator comprises the following steps:

[0014] S1. Add ethanol to the reaction device, then add the photosensitive component, the co-initiator component, the dispersing component and the stabilizing component, and stir until they are completely dissolved to obtain a primary mixture.

[0015] S2. Slowly add the sensitizing component to the preliminary mixture and stir evenly to obtain a final mixture.

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

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

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

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

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention adds a rare earth ion complex prepared by the reaction of yttrium nitrate, ytterbium nitrate, erbium nitrate and ammonium fluoride as a sensitizing component. The complex inherits the spectral characteristics of rare earth ions and has strong absorption and emission capabilities for light of a specific wavelength. When the rare earth ion complex is excited by sufficient energy, it transmits energy to the surrounding photosensitive components or co-initiating components by emitting fluorescence, thereby improving the ability of the modified photoinitiator to capture light energy, thereby initiating a deeper polymerization reaction and being able to penetrate the material to be cured more deeply.

[0022] 2. The rare earth ion complex in the present invention forms a stable chemical connection between the rare earth ion and the fluoride ion through the formation of a coordination bond, thereby enhancing the dispersibility and compatibility of the complex in the modified photoinitiator, and reducing the dissociation or precipitation of the rare earth ion due to changes in the external environment, thereby ensuring the stability of the modified photoinitiator during long-term storage and use. In addition, the formation of the complex gives the rare earth ion a specific spatial configuration and electronic arrangement. This specific structure changes the absorption and emission characteristics of the rare earth ion to light, further improving the utilization efficiency of the modified photoinitiator to light and its ability to capture light energy. DETAILED DESCRIPTION

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

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

[0025] Unless otherwise specified, the materials, reagents, etc. used in the embodiments of the present invention can be obtained from commercial sources.

[0026] Example 1

[0027] A modified photoinitiator comprises the following raw materials in parts by weight: 30 parts of photosensitive component, 10 parts of sensitizing component, 10 parts of ethanol, 5 parts of auxiliary initiating component, 4 parts of dispersing component, and 2 parts of stabilizing component. Among them, the photosensitive component is benzophenone, the sensitizing component is a rare earth ion complex, the auxiliary 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 is prepared by the following method: rare earth nitrate is dissolved in deionized water at a material-liquid ratio of 1:50 to obtain a rare earth ion solution. The rare earth nitrate is composed of yttrium nitrate, ytterbium nitrate and erbium nitrate in a mass ratio of 75:15:1. Ammonium fluoride is dissolved in deionized water at a material-liquid ratio of 1:10 to obtain a ligand solution. The rare earth ion solution and the ligand solution are 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 is completed, heating is stopped and naturally cooled to 20°C, and then a saturated sodium oxalate solution is slowly added to the reaction solution while stirring until a precipitate appears, and then it is allowed to stand for 2 hours, and then the liquid is filtered to obtain the precipitate. The precipitate is washed twice with deionized water, and then the precipitate is placed in a drying oven and dried to constant weight at 60°C to obtain a rare earth ion complex.

[0029] Example 2

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

[0031] The rare earth ion complex is prepared by the following method: rare earth nitrate is dissolved in deionized water at a material-liquid ratio of 1:100 to obtain a rare earth ion solution. The rare earth nitrate is composed of yttrium nitrate, ytterbium nitrate and erbium nitrate in a mass ratio of 80:25:3. Ammonium fluoride is dissolved in deionized water at a material-liquid ratio of 1:20 to obtain a ligand solution. The rare earth ion solution and the ligand solution are 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 is completed, heating is stopped and naturally cooled to 30°C, and then a saturated sodium oxalate solution is slowly added to the reaction solution while stirring until a precipitate appears, and then it is allowed to stand for 4 hours, and then the liquid is filtered to obtain the precipitate. The precipitate is washed 3 times with deionized water, and then the precipitate is placed in a drying oven and dried to constant weight at 80°C to obtain a rare earth ion complex.

[0032] Example 3

[0033] A modified photoinitiator comprises the following raw materials in parts by weight: 45 parts of photosensitive components, 15 parts of sensitizing components, 12 parts of ethanol, 8 parts of auxiliary initiating components, 6 parts of dispersing components, and 3 parts of stabilizing components. The photosensitive component is composed of 4-chlorobenzophenone, 4-methoxyacetophenone, and 2-hydroxy-2-methylpropiophenone in a mass ratio of 1:1:1, the sensitizing component is a rare earth ion complex, the auxiliary initiating component is composed of N,N-dimethylbenzylamine and adipic acid dihydrazide in a volume ratio of 1:1, the dispersing component is composed of propylene glycol, glycerol monostearate, and sorbitan monooleate in a mass volume ratio of 1:1:1 g / mL, and the stabilizing component is composed of tris(2,4-di-tert-butylphenyl)phosphite and N-acetylcysteine ​​in a mass ratio of 1:1.

[0034] The rare earth ion complex is prepared by the following method: rare earth nitrate is dissolved in deionized water at a material-liquid ratio of 1:75 to obtain a rare earth ion solution. The rare earth nitrate is composed of yttrium nitrate, ytterbium nitrate and erbium nitrate in a mass ratio of 78:20:2. Ammonium fluoride is dissolved in deionized water at a material-liquid ratio of 1:15 to obtain a ligand solution. The rare earth ion solution and the ligand solution are 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 is completed, heating is stopped and naturally cooled to 25°C, and then a saturated sodium oxalate solution is slowly added to the reaction solution while stirring until a precipitate appears, and then it is allowed to stand for 3 hours, and then the liquid is filtered to obtain the precipitate. The precipitate is washed 3 times with deionized water, and then the precipitate is placed in a drying oven and dried to constant weight at 70°C to obtain a rare earth ion complex.

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

[0036] S1. Add ethanol to the reaction device, then add the photosensitive component, the co-initiator component, the dispersing component and the stabilizing component, stir at 350 r / min for 50 min until completely dissolved to obtain a primary mixture.

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

[0038] S3. Place the final mixture in an ultrasonic device and perform ultrasonic treatment for 15 min at an ultrasonic treatment power of 120 W and an ultrasonic treatment frequency of 30 kHz.

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

[0040] Example 4

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

[0042] S1. Add ethanol to the reaction device, then add the photosensitive component, the co-initiator component, the dispersing component and the stabilizing component, stir at 200 r / min for 60 min until completely dissolved to obtain a primary mixture.

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

[0044] S3. Place the final mixture in an ultrasonic device and perform ultrasonic treatment for 20 min at an ultrasonic treatment power of 50 W and an ultrasonic treatment frequency of 20 kHz.

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

[0046] Example 5

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

[0048] S1. Add ethanol to the reaction device, then add the photosensitive component, the co-initiator component, the dispersing component and the stabilizing component, stir at 500 r / min for 40 min until completely dissolved to obtain a primary mixture.

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

[0050] S3. Place the final mixture in an ultrasonic device and perform ultrasonic treatment for 10 min at an ultrasonic treatment power of 200 W and an ultrasonic treatment frequency of 40 kHz.

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

[0052] Comparative Example 1

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

[0054] Comparative Example 2

[0055] The difference between this comparative example and Example 3 is that the sensitizing component is 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 a co-initiator component.

[0058] 1. Determination of curing depth

[0059] Take the modified photoinitiators prepared in Examples 1-5 and Comparative Examples 1-3 respectively, mix them with epoxy resin in a ratio of 5:95 to obtain mixed glue. Put the mixed glue into cylindrical containers with a diameter of 10 mm and a height of 20 mm, and each container is filled with mixed glue to a height of 15 mm. Place the containers containing the mixed glue directly under a UV lamp at 100 mW / cm 2 The light intensity was irradiated for 60 seconds to cure and obtain a cured product. The cured product was taken out and the uncured part at the bottom was removed. The height of the cured product was measured with a vernier caliper, which was the curing depth. The above test was repeated 5 times and the average value was taken as the curing depth. The results are shown in Table 1.

[0060] Table 1

[0061]

[0062] From the comparison of Examples 1-5 and Comparative Examples 1-3 in Table 1, it can be seen that the modified photoinitiator prepared in the present invention has a better curing depth, especially Example 3 has a better effect.

[0063] By comparing Example 3 with Comparative Example 1, the rare earth ion complex of the sensitizing component in Example 3 is prepared by reacting yttrium nitrate, ytterbium nitrate, erbium nitrate and ammonium fluoride. The complex inherits the spectral characteristics of rare earth ions and has strong absorption and emission capabilities for light of a specific wavelength. When the modified photoinitiator is exposed to light, the photosensitive component first absorbs light energy and transitions to an excited state. Subsequently, the photosensitive component in the excited state transfers energy to the rare earth ion complex by energy transfer. Since the rare earth ion complex has unique optical properties, they can absorb and store this part of energy more effectively. When the rare earth ion complex is excited by sufficient energy, it transfers energy to the surrounding photosensitive components or co-initiating components by emitting fluorescence, thereby improving the ability of the modified photoinitiator to capture light energy, thereby initiating a deeper polymerization reaction and being able to penetrate the material to be cured more deeply. At the same time, the introduction of the rare earth ion complex broadens the absorption spectrum range of the modified photoinitiator. Since rare earth ions can absorb and emit light of a specific wavelength, these lights may not have been absorbed or utilized by the photosensitive component. Through the energy transfer mechanism of rare earth ion complexes, the light energy that was originally not utilized 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, thereby improving the deep curing ability.

[0064] By comparing Example 3 with Comparative Example 2, the rare earth ion complex establishes a stable chemical connection between the rare earth ion and the fluoride ion through the formation of a coordination bond, thereby enhancing the dispersibility and compatibility of the complex in the modified photoinitiator, and reducing the dissociation or precipitation of the rare earth ion due to changes in the external environment, thereby ensuring the stability of the modified photoinitiator during long-term storage and use. In addition, the formation of the complex gives the rare earth ion a specific spatial configuration and electronic arrangement. This specific structure changes the absorption and emission characteristics of the rare earth ion to light, further improving the utilization efficiency of the modified photoinitiator to light and the ability to capture light energy. In the rare earth ion complex, the interaction between the rare earth ion and the ligand promotes the effective transfer of energy between the ion and the ligand. When the photosensitive component absorbs light energy and transitions to an excited state, this part of the energy is more easily transferred to the rare earth ion through the complex structure, thereby inducing the fluorescence emission of the rare earth ion.

[0065] By comparing Example 3 with Comparative Example 3, in Example 3, by adding a co-initiator component, it can react with the free radicals generated by the photosensitive component to generate more active free radicals, thereby accelerating the polymerization reaction. In the deep curing process, since the light intensity decreases with the increase of depth, the generation rate of free radicals will also slow down accordingly. The presence of the co-initiator component can make up for this deficiency, and through its reaction with the primary free radical, more active free radicals are generated to promote the polymerization reaction to a deeper level. The co-initiator component can also reduce the initiation threshold of the photoinitiator, that is, the polymerization reaction can be initiated under a lower light intensity. This is particularly important for deep curing, because with the increase of the curing depth, the light intensity gradually decreases, and the addition of the co-initiator component enables the modified photoinitiator to effectively initiate polymerization under lower light conditions. In addition, in the deep curing process, due to the weakening of light intensity and the reduction of free radical concentration, the crosslinking degree of the polymer may be affected. The addition of the co-initiator component can make up for this defect, by increasing the crosslinking point, the crosslinking density and mechanical properties of the polymer are improved.

[0066] 2. Migration Determination

[0067] Take the modified photoinitiator obtained in Examples 1-5 and Comparative Examples 1-3 respectively, mix them evenly with acrylate resin in a ratio of 2:98, and prepare a uniform coating with a thickness of 2 mm, and then cure it into a cured film under a violet lamp. Grind the cured film into powder and weigh 200 mg respectively, and place the ground powder in 2 mL of acetonitrile and let it stand for 48 hours. After 48 hours of soaking, stir for 3 minutes, then filter out the powder to obtain a filtrate. Wash the filtered powder twice with acetonitrile, pour the acetonitrile used for washing back into the filtrate, and make the filtrate constant to 10 mL. Measure the absorbance of the maximum absorption peak of the photoinitiator with a spectrophotometer, and quantitatively calculate the mobility of the photoinitiator according to the Lambert-Beer law. Each sample is tested 5 times, and the average value is recorded as the mobility in Table 2. The mobility is calculated according to the following formula:

[0068]

[0069] Where 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 absorption coefficient 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 rate % 0.35 0.34 0.31 0.32 0.35 0.53 0.71 0.84

[0072] It can be seen from Table 2 that the mobility of the modified photoinitiator prepared by the present invention application is low. This is because the carboxyl group in the photosensitive component of the present invention application can undergo an esterification reaction with the hydroxyl group in the resin matrix to generate an ester bond, thereby fixing the photosensitive component in the resin matrix. The rare earth ion complex as a sensitizing component is attached to the surface of the resin matrix through physical adsorption, and at the same time, its central ions such as rare earth ions such as yttrium, ytterbium, and erbium form coordination bonds with oxygen-containing ligands, nitrogen-containing ligands, etc. in the resin matrix, thereby enhancing the interaction between the complex and the resin matrix. The rare earth ion complex also forms a stable structure with the functional groups in the resin matrix through its multi-dentate ligand structure, thereby helping to fix the complex in the resin matrix. The co-initiator component can accelerate the diffusion and propagation of free radicals in the resin matrix, so that the polymerization reaction occurs more evenly throughout the resin matrix, which helps to form a more dense and stable resin network structure, thereby 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A modified photoinitiator, characterized in that: The invention 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 initiating auxiliary component, 4-8 parts of a dispersing component, and 2-4 parts of a stabilizing component. The sensitizing component is a rare earth ion complex, and the rare earth ion complex is prepared by the following method: dissolving rare earth nitrate in deionized water at a material-liquid ratio of 1:(50-100) to obtain a rare earth ion solution; dissolving ammonium fluoride in deionized water at a material-liquid ratio of 1:(10-20) to obtain a ligand solution; dissolving the rare earth ion solution ... The liquid and the ligand solution are mixed at a ratio of (1.0-1.5):(1.0-2.0) to obtain a reaction solution, and the reaction is stirred at 60-90°C for 3-5h. After the reaction is completed, heating is stopped and the solution is naturally cooled to 20-30°C. Then, a saturated sodium oxalate solution is slowly added dropwise to the reaction solution while stirring until a precipitate appears, and then the solution is allowed to stand for 2-4h, and then the liquid is filtered out to obtain the precipitate; the precipitate is washed with deionized water for 2-3 times, and then the precipitate is placed in a drying oven and dried to constant weight at 60-80°C to obtain a rare earth ion complex.

2. A modified photoinitiator according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 45 parts of photosensitive components, 15 parts of sensitizing components, 12 parts of ethanol, 8 parts of auxiliary initiating components, 6 parts of dispersing components and 3 parts of stabilizing components.

3. A modified photoinitiator as claimed in claim 1, characterized in that: 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).

4. A modified photoinitiator as claimed in claim 1, characterized in that: The photosensitive component is one or a combination of benzophenone, 4-methylbenzophenone, 4-chlorobenzophenone, acetophenone, 4-methoxyacetophenone, and 2-hydroxy-2-methylpropiophenone.

5. A modified photoinitiator as claimed in claim 1, characterized in that: The auxiliary initiator component is one or a combination of triethylamine, N,N-dimethylethanolamine, N,N-dimethylbenzylamine, adipic acid dihydrazide, and ethyl 4-(dimethylamino)benzoate.

6. A modified photoinitiator as claimed in claim 1, characterized in that: The dispersing component is one or a combination of polysorbate 80, ethylene glycol, propylene glycol, glycerol monostearate, and sorbitan monooleate.

7. A modified photoinitiator as claimed in claim 1, characterized in that: The stabilizing component is one or a combination of 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.

8. A process for preparing a modified photoinitiator according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Add ethanol to the reaction apparatus, then add the photosensitive component, the co-initiator component, the dispersing component and the stabilizing component, and stir until completely dissolved to obtain an initial mixture; S2. Slowly add the sensitizing component to the initial mixture and stir to obtain a final mixture; S3. placing the final mixture into an ultrasonic device for ultrasonic treatment; S4. After the ultrasonic treatment is completed, the final mixture is placed in a spray drying device for spray drying to obtain a modified photoinitiator.

9. The process for preparing a modified photoinitiator according to claim 8, characterized in that: The stirring speed in S1 is 200-500 r / min and the stirring time is 40-60 min. The stirring speed in S2 is 100-300 r / min and the stirring time is 20-40 min.

10. The process for preparing a modified photoinitiator according to claim 8, characterized in that: In the S3, the ultrasonic treatment power is 50-200 W, the ultrasonic treatment frequency is 20-40 kHz, and the ultrasonic treatment time is 10-20 min. In the S4, the spray drying temperature is 60-100° C. and the spray pressure is 0.2-0.5 MPa.

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