A two-component silicone sealant, its preparation method and application

Abstract

This invention belongs to the field of silicone sealant technology, and specifically relates to a two-component silicone sealant, its preparation method, and its application. The two-component silicone sealant of this invention includes component A and component B; component A includes α,ω-dihydroxypolydimethylsiloxane and peroxide; component B includes dimethyl silicone oil, crosslinking agent, photoacid generator, photosensitizer, peroxyoxalate, and fluorescent agent. In this invention, the peroxide, peroxyoxalate, fluorescent agent, photosensitizer, and photoacid generator are all indispensable. Hydrogen peroxide, peroxyoxalate, and fluorescent agent complete molecular-level chemiluminescence, and under the combined action of the photosensitizer and crosslinking agent, the photoacid generator in the silicone sealant system is uniformly decomposed and Lewis acid is generated, catalyzing the moisture curing of the silicone sealant. This solves the problem of limited curing depth in photoacid-catalyzed curing systems induced by external light sources, resulting in silicone sealants with good curing depth and storage stability.

Description

Technical Field

[0001] This invention belongs to the field of silicone sealant technology, and specifically relates to a two-component silicone sealant, its preparation method, and its application. Background Technology

[0002] Two-component silicone sealants are widely used for sealing and bonding insulated glass, curtain walls, and other applications due to their excellent weather resistance, sealing properties, and adhesion. A two-component silicone sealant consists of two components, A and B. Component A mainly comprises 107 adhesive, fillers, and plasticizers, while component B mainly comprises color paste, crosslinking agents, coupling agents, and catalysts. Because component B contains both crosslinking agents, coupling agents, and catalysts, during storage, the catalyst can catalyze the reaction of the crosslinking agents and coupling agents with trace amounts of water, consuming some functional groups. This results in a slower curing speed and poorer performance after curing.

[0003] Photo-initiators are special photoinitiators that absorb energy under light irradiation and undergo photolysis to produce Lewis acids or bases, which can then catalyze or initiate polymer reactions and cure the polymer system. A study has yielded an in-situ reinforced UV-moisture dual-curing silicone sealant that does not require the addition of traditional organotin catalysts. The photo-alkali-generating agent in the silicone sealant, induced by UV light, produces alkaline substances that catalyze moisture curing. Under light-protected conditions, the silicone sealant exhibits excellent resistance to damp heat. However, this silicone sealant requires a light source to trigger moisture curing, and the depth of moisture curing is limited by the penetration depth of UV light, resulting in limited sealing and adhesion, thus restricting the practical application of this silicone sealant.

[0004] Therefore, developing a silicone sealant with good curing depth and storage stability is of great significance. Summary of the Invention

[0005] The present invention aims to solve one or more technical problems existing in the prior art, and at least provide a beneficial alternative or create conditions. Specifically, the present invention provides a two-component silicone sealant with good curing depth and storage stability.

[0006] The inventive concept of this invention: The two-component silicone sealant of this invention includes component A and component B; component A includes α,ω-dihydroxypolydimethylsiloxane and peroxide; component B includes dimethyl silicone oil, crosslinking agent, photoacid generator, photosensitizer, peroxyoxalate and fluorescent agent. In this invention, the peroxide in component A and the peroxyoxalate in component B react to generate a metastable cyclic dioxygenated high-energy intermediate, 1,2-dioxane-3,4-dione. Subsequently, the high-energy intermediate interacts with the fluorescent agent (electron transfer and reverse electron transfer), causing the high-energy intermediate to decompose and release energy. The fluorescent agent gains energy and transforms into a singlet excited state. Finally, the singlet excited state fluorescent agent releases energy in the form of luminescence and returns to the ground state. That is, the peroxide, peroxyoxalate, and fluorescent agent complete molecular-level chemiluminescence. Under the combined action of photosensitizer and crosslinking agent, the photoacid-producing agent in the photoinduced silicone sealant system is uniformly decomposed and produces Lewis acid, which catalyzes the moisture curing of the silicone sealant. This can solve the problem of limited curing depth in photoacid-producing catalytic curing systems induced by external light sources, and the product has good storage stability.

[0007] Therefore, a first aspect of the present invention provides a two-component silicone sealant.

[0008] Specifically, the two-component silicone sealant includes component A and component B;

[0009] Component A includes α,ω-dihydroxypolydimethylsiloxane and peroxide;

[0010] Component B includes dimethyl silicone oil, crosslinking agent, photoacid generator, photosensitizer, peroxyoxalate, and fluorescent agent.

[0011] Preferably, by weight, component A comprises 60-100 parts of α,ω-dihydroxypolydimethylsiloxane and 4-8 parts of peroxide; component B comprises 60-100 parts of dimethyl silicone oil, 60-90 parts of crosslinking agent, 6-10 parts of photoacid-producing agent, 4-8 parts of photosensitizer, 10-16 parts of peroxyoxalate and 4-8 parts of fluorescent agent.

[0012] More preferably, by weight, component A comprises 65-80 parts of α,ω-dihydroxypolydimethylsiloxane and 6-8 parts of peroxide; component B comprises 70-80 parts of dimethyl silicone oil, 70-80 parts of crosslinking agent, 8-10 parts of photoacid-producing agent, 5-8 parts of photosensitizer, 12-14 parts of peroxyoxalate ester and 6-8 parts of fluorescent agent.

[0013] Preferably, the peroxide comprises hydrogen peroxide.

[0014] Preferably, the crosslinking agent comprises at least one of methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, n-octyltrimethoxysilane, n-octyltriethoxysilane, n-dodecyltrimethoxysilane, n-dodecyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, 1,2-bis(trimethoxy)silylethane, 1,2-bis(triethoxy)silylethane, polymethyltriethoxysilane, methyl orthosilicate, ethyl orthosilicate, propyl orthosilicate, isopropyl orthosilicate, and butyl orthosilicate.

[0015] More preferably, the crosslinking agent includes at least one of methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, 1,2-bis(trimethoxy)silyl ethane, 1,2-bis(triethoxy)silyl ethane, and polymethyltriethoxysilane.

[0016] Preferably, the photoacid-generating agent comprises at least one of diphenyliodonium hexafluorophosphate, diphenyliodonium hexafluoroantimonate, diphenyliodonium hexafluoroarsenate, 4,4'-dimethyldiphenyliodonium hexafluorophosphate, triphenylthionium hexafluorophosphate, triphenylthionium hexafluoroantimonate, diphenyl-(4-phenylthionium)phenylthionium hexafluorophosphate, diphenyl-(4-phenylthionium)phenylthionium hexafluoroantimonate, and 4-isobutylphenyl-4'-methylphenyliodonium hexafluorophosphate.

[0017] More preferably, the photoacid-generating agent includes at least one of triphenylthionium hexafluorophosphate, triphenylthionium hexafluoroantimonate, diphenyl-(4-phenylthionium)phenylthionium hexafluorophosphate, and diphenyl-(4-phenylthionium)phenylthionium hexafluoroantimonate.

[0018] Preferably, the photosensitizer includes at least one of curcumin, demethylcurcumin, bis-demethylcurcumin, demethoxycurcumin, and bis-demethoxycurcumin.

[0019] More preferably, the photosensitizer includes at least one of curcumin, demethylcurcumin, and bis-demethylcurcumin.

[0020] Preferably, the peroxyoxalate comprises at least one of diphenyl oxalate, bis(4-methoxyphenyl)oxalate, bis(2,4,6-trichlorophenyl)oxalate, bis(2,4-dinitrophenyl)oxalate, and bis(2,4,5-trichlorophenyl-6-carbonyl-pentoxyphenyl)oxalate.

[0021] More preferably, the peroxyoxalate comprises at least one of diphenyl oxalate, bis(4-methoxyphenyl)oxalate, and bis(2,4,6-trichlorophenyl)oxalate.

[0022] Preferably, the fluorescent agent comprises 9,10-diphenylanthracene.

[0023] Preferably, the peroxide is a peroxide solution with a concentration of 27-55%; more preferably, the concentration of the peroxide solution is 30-50%.

[0024] Preferably, component A further includes at least one of a plasticizer and a first filler.

[0025] Preferably, the plasticizer comprises dimethyl silicone oil.

[0026] Preferably, the first filler includes at least one of calcium powder and silicon dioxide.

[0027] Preferably, the calcium powder includes at least one of light calcium powder, heavy calcium powder, and nano calcium powder; the silica includes at least one of fumed silica and precipitated silica.

[0028] More preferably, the first filler includes at least one of heavy calcium powder and nano calcium powder.

[0029] Preferably, component B further includes at least one of a second filler and a coupling agent.

[0030] Preferably, the second filler comprises carbon black.

[0031] Preferably, the coupling agent comprises a silane coupling agent.

[0032] More preferably, the silane coupling agent comprises at least one of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminoethylaminopropyltrimethoxysilane, γ-aminoethylaminopropyltriethoxysilane, γ-diethylenetriaminopropyltrimethoxysilane, p-aminophenyltrimethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, N-n-butyl-3-aminopropyltrimethoxysilane, γ-glycidyl etheroxypropyltrimethoxysilane, γ-glycidyl etheroxypropyltriethoxysilane, 2-(3,4-epoxycyclohexane)ethyltrimethoxysilane, and 2-(3,4-epoxycyclohexane)ethyltriethoxysilane.

[0033] More preferably, the silane coupling agent includes at least one of γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminoethylaminopropyltrimethoxysilane, γ-aminoethylaminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-glycidoxypropyltriethoxysilane.

[0034] Preferably, component A further includes a plasticizer and a first filler; component B further includes a second filler and a coupling agent; and by weight, component A includes 60-100 parts of α,ω-dihydroxypolydimethylsiloxane, 4-8 parts of peroxide, 8-14 parts of plasticizer, and 60-100 parts of the first filler; component B includes 60-100 parts of dimethyl silicone oil, 60-90 parts of crosslinking agent, 6-10 parts of photoacid-producing agent, 4-8 parts of photosensitizer, 10-16 parts of peroxyoxalate, 4-8 parts of fluorescent agent, 20-40 parts of the second filler, and 10-30 parts of coupling agent.

[0035] More preferably, component A further includes a plasticizer and a first filler; component B further includes a second filler and a coupling agent; and by weight, component A includes 65-80 parts of α,ω-dihydroxypolydimethylsiloxane, 6-8 parts of peroxide, 9-12 parts of plasticizer, and 70-90 parts of the first filler; component B includes 70-80 parts of dimethyl silicone oil, 70-80 parts of crosslinking agent, 8-10 parts of photoacid-producing agent, 5-8 parts of photosensitizer, 12-14 parts of peroxyoxalate, 6-8 parts of fluorescent agent, 25-35 parts of the second filler, and 20-30 parts of coupling agent.

[0036] Preferably, the viscosity of the α,ω-dihydroxypolydimethylsiloxane at 25±0.5℃ is 4500-110000 mPa·s; more preferably, the viscosity of the α,ω-dihydroxypolydimethylsiloxane at 25±0.5℃ is 5000-100000 mPa·s.

[0037] Preferably, the viscosity of the dimethyl silicone oil at 25±0.5℃ is 90-16000 mPa·s; more preferably, the viscosity of the dimethyl silicone oil at 25±0.5℃ is 100-15000 mPa·s.

[0038] Specifically, the dimethyl silicone oil is either the dimethyl silicone oil in component A plasticizer or the dimethyl silicone oil in component B.

[0039] A second aspect of the present invention provides a method for preparing the two-component silicone sealant described in the first aspect of the present invention.

[0040] Specifically, the preparation method of the two-component silicone sealant includes the following steps:

[0041] The raw material components of component A are mixed to obtain component A;

[0042] The raw material components of component B are mixed to obtain component B; component A and component B are mixed to obtain the two-component silicone sealant.

[0043] Preferably, when component A and component B are mixed, the volume ratio of component A to component B is 8-13:1; more preferably, when component A and component B are mixed, the volume ratio of component A to component B is 9-12:1.

[0044] Preferably, the preparation steps of component B are as follows: first, the second filler and dimethyl silicone oil are mixed and dehydrated under reduced pressure, and then the remaining components are added to obtain component B.

[0045] Preferably, the temperature for vacuum dehydration is 90-140℃, and the time for vacuum dehydration is 0.5-2.5h; more preferably, the temperature for vacuum dehydration is 100-130℃, and the time for vacuum dehydration is 1-2h.

[0046] Preferably, the preparation processes of both component A and component B are carried out under light-protected conditions.

[0047] A third aspect of the present invention provides an application of the two-component silicone sealant described in the first aspect of the present invention in the field of sealing and bonding.

[0048] Compared with the prior art, the beneficial effects of the technical solution provided by the present invention are as follows:

[0049] (1) The peroxide in component A and the peroxyoxalate in component B of this invention react to generate a metastable cyclic dioxy high-energy intermediate 1,2-dioxane-3,4-dione. Subsequently, the high-energy intermediate interacts with the fluorescent agent (electron transfer and reverse electron transfer), causing the high-energy intermediate to decompose and release energy. The fluorescent agent gains energy and transforms into a singlet excited state. Finally, the singlet excited state fluorescent agent releases energy in the form of light emission and returns to the ground state. That is, the peroxide, peroxyoxalate, and fluorescent agent complete molecular-level chemiluminescence. Under the combined action of photosensitizer and crosslinking agent, the photo-induced acid-producing agent in the silicone sealant system is uniformly decomposed and Lewis acid is generated to catalyze the moisture curing of the silicone sealant. This solves the problem of limited curing depth of the photo-induced acid-producing curing system induced by external light source, and the product has good storage stability.

[0050] (2) No catalysts such as organotin were added to component B of the present invention. Under light-protected conditions, component B has excellent storage stability, which makes the silicone sealant have good storage stability.

[0051] (3) The preparation process of this invention is simple and easy to apply in large-scale production. Detailed Implementation

[0052] To enable those skilled in the art to more clearly understand the technical solutions described in this invention, the following embodiments are provided for illustration. It should be noted that the following embodiments do not constitute a limitation on the scope of protection claimed by this invention.

[0053] Unless otherwise specified, the raw materials, reagents or devices used in the following examples are available from conventional commercial sources or can be obtained by existing known methods.

[0054] The viscosity values ​​mentioned in the embodiments of this invention refer to the viscosity values ​​at 25°C.

[0055] Example 1

[0056] A two-component silicone sealant includes component A and component B. By mass, component A includes 80 parts of α,ω-dihydroxy polydimethylsiloxane with a viscosity of 20000 mPa·s, 9 parts of dimethyl silicone oil with a viscosity of 100 mPa·s, 70 parts of nano-calcium powder, and 6 parts of hydrogen peroxide aqueous solution with a concentration of 30%.

[0057] Component B comprises 30 parts carbon black, 70 parts dimethyl silicone oil with a viscosity of 1000 mPa·s, 40 parts methyltrimethoxysilane, 40 parts methyltriethoxysilane, 10 parts γ-aminoethylaminopropyltrimethoxysilane, 10 parts γ-glycidyl etheroxypropyltrimethoxysilane, 8 parts triphenylthionium hexafluorophosphate, 5 parts curcumin, 12 parts diphenyl oxalate, and 6 parts 9,10-diphenylanthracene.

[0058] A method for preparing a two-component silicone sealant includes the following steps:

[0059] (1) Under light-protected conditions, α,ω-dihydroxypolydimethylsiloxane, dimethyl silicone oil, nano-calcium powder, and hydrogen peroxide aqueous solution are mixed evenly to obtain component A;

[0060] (2) After mixing carbon black and dimethyl silicone oil evenly, stir and heat under reduced pressure. After the temperature reaches 130℃, keep it at the temperature and dehydrate under reduced pressure and stirring for 2 hours. The pressure for dehydration under reduced pressure and stirring is -0.09MPa. Then cool to 30℃ and add methyltrimethoxysilane, methyltriethoxysilane, γ-aminoethylaminopropyltrimethoxysilane, γ-glycidyl etheroxypropyltrimethoxysilane, triphenylthionium hexafluorophosphate, curcumin, diphenyl oxalate, and 9,10-diphenylanthracene under light-protected conditions to obtain component B.

[0061] Example 2

[0062] The only difference between Example 2 and Example 1 is that in Example 2, an equal amount of bis(2,4,6-trichlorophenyl)oxalate is used instead of diphenyl oxalate in Example 1, while the rest is the same as in Example 1.

[0063] Example 3

[0064] The only difference between Example 3 and Example 1 is that the amount of diphenyl oxalate used in Example 3 is 14 parts, and the rest is the same as in Example 1.

[0065] Example 4

[0066] The only difference between Example 4 and Example 1 is that the amount of fluorescent agent 9,10-diphenylanthracene used in Example 4 is 8 parts, and the rest is the same as in Example 1.

[0067] Example 5

[0068] The only difference between Example 5 and Example 1 is that the amount of photosensitizer curcumin used in Example 5 is 8 parts, and the rest is the same as in Example 1.

[0069] Comparative Example 1

[0070] The only difference between Comparative Example 1 and Example 1 is that Comparative Example 1 does not contain the fluorescent agent 9,10-diphenylanthracene; otherwise, it is the same as Example 1.

[0071] Comparative Example 2

[0072] The only difference between Comparative Example 2 and Example 1 is that Comparative Example 2 uses 0.5 parts of dibutyltin dilaurate to replace the photoacid generator triphenylthionium hexafluorophosphate, while the rest is the same as in Example 1.

[0073] Comparative Example 3

[0074] The only difference between Comparative Example 3 and Example 1 is that Comparative Example 3 does not contain the photosensitizer curcumin; otherwise, it is the same as Example 1.

[0075] Comparative Example 4

[0076] The only difference between Comparative Example 4 and Example 1 is that Comparative Example 4 does not contain the fluorescent agent 9,10-diphenylanthracene, and is irradiated by an external light source after sizing. Otherwise, it is the same as Example 1.

[0077] Performance testing

[0078] The performance of the two-component silicone sealants prepared in Examples 1-5 and Comparative Examples 1-4 was tested. The specific test items and methods are as follows:

[0079] Curing speed of silicone sealant: The A and B components of the two-component silicone sealants prepared in Examples 1-5 and Comparative Examples 1-4 were mixed uniformly under vacuum at a volume ratio of 10:1. Then, the tensile breaking time of the silicone sealant was tested according to Appendix D.5 of GB 16776-2005. The curing speed of the silicone sealant was characterized by the tensile breaking time.

[0080] Curing depth of silicone sealant: Components A and B of the two-component silicone sealants prepared in Examples 1-5 and Comparative Examples 1-4 were mixed uniformly under vacuum at a volume ratio of 10:1. The mixed silicone sealant was then applied to disposable plastic cups with a depth of 70 mm. After curing for 24 hours, the disposable plastic cups were cut open, and the curing depth of the silicone sealant was measured. In Comparative Example 4, after application, the sealant was irradiated with an external light source, specifically a 365 nm point light source with a UV light intensity of 10 mW·cm². -2 Irradiate perpendicularly to the mouth of a disposable plastic cup for 10 seconds.

[0081] Storage stability of silicone sealant: Component B of each group of two-component silicone sealants was sealed in a bottle and placed in a 70℃ forced-air drying oven for 7 days (heat treatment). The treated component B was then mixed with component A under vacuum at a volume ratio of 10:1 (for Comparative Example 4, the mixture was irradiated with an external light source after application). The tensile time of the silicone sealant was then tested according to Appendix D.5 of GB 16776-2005, and the elongation at break was calculated using the following formula:

[0082]

[0083] A represents the extension of the tensile breaking time, B represents the tensile breaking time of the silicone sealant before heat treatment, and C represents the tensile breaking time of the silicone sealant after heat treatment.

[0084] By comparing the tensile time of silicone sealant after 7 days of heat treatment with the tensile time of sealant without heat treatment, we can determine whether it has good storage stability. The smaller the extension of the tensile time, the better the storage stability.

[0085] The performance test results of the two-component silicone sealants prepared in Examples 1-5 and Comparative Examples 1-4 are shown in Table 1.

[0086] Table 1: Performance test results of the two-component silicone sealants prepared in Examples 1-5 and Comparative Examples 1-4

[0087]

[0088]

[0089] As can be seen from Table 1, the present invention can solve the problem of limited curing depth of the photo-acid-producing catalytic curing system induced by external light source, so that the two-component silicone sealant has good curing depth and storage stability.

[0090] Comparative Example 1 did not add a fluorescent agent, so it could not produce chemiluminescence. Therefore, it could not induce the photoacid generator in the silicone sealant to decompose and produce Lewis acid. Without the catalysis of acid, it could not be moisture-cured and thus could not be cured.

[0091] Comparative Example 2 added a small amount of organotin catalyst to replace the photoacid generator. Because of the organotin catalyst in component B, during heat treatment, the hydrolyzable groups on the crosslinking agent in component B react with trace amounts of water under its catalysis, resulting in dehydration condensation. The water produced by this condensation also reacts with the crosslinking agent under catalysis, reducing the number of effective functional groups in component B. Therefore, the curing speed of the silicone sealant after heat treatment is significantly slower. Since the photoacid generator is very stable under light-protected conditions, Example 1 exhibits excellent storage stability; even after 7 days of heat treatment, the curing speed of the silicone sealant did not slow down significantly.

[0092] Since no photosensitizer was added to Comparative Example 3, the light generated by chemiluminescence could not be absorbed by the photoacid-producing agent and thus could not be decomposed. Therefore, Comparative Example 3 could not undergo moisture curing.

[0093] Comparative Example 4 is based on Comparative Example 1. After applying the adhesive, the surface of the silicone sealant is irradiated by an external light source. The photoacid generator can decompose under the induction of the external light source to produce Lewis acid to catalyze moisture curing. However, due to the limited penetration depth of the external light source in the silicone sealant, the silicone sealant in Comparative Example 4 only cures and forms a skin on the surface, and internal curing cannot occur.

[0094] In summary, the peroxide, peroxate, fluorescent agent, photosensitizer, and photoacid generator are all indispensable in this invention. The peroxide, peroxate, and fluorescent agent complete the molecular-level chemiluminescence, and under the combined action of the photosensitizer and crosslinking agent, the photoacid generator in the photoinduced silicone sealant system is uniformly decomposed and generates Lewis acid to catalyze the moisture curing of the silicone sealant. This solves the problem of limited curing depth in photoacid generation catalytic curing systems induced by external light sources, and the product has good storage stability.

[0095] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A silicone sealant, characterized in that, Includes component A and component B; Component A includes α,ω-dihydroxypolydimethylsiloxane and peroxide; Component B includes dimethyl silicone oil, crosslinking agent, photoacid generator, photosensitizer, oxalate ester, and fluorescent agent; The crosslinking agent includes at least one of methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, n-octyltrimethoxysilane, n-octyltriethoxysilane, n-dodecyltrimethoxysilane, n-dodecyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, 1,2-bis(trimethoxy)silylethane, 1,2-bis(triethoxy)silylethane, polymethyltriethoxysilane, methyl orthosilicate, ethyl orthosilicate, propyl orthosilicate, isopropyl orthosilicate, and butyl orthosilicate. The photoacid-generating agent includes at least one of the following: diphenyliodonium hexafluorophosphate, diphenyliodonium hexafluoroantimonate, diphenyliodonium hexafluoroarsenate, 4,4'-dimethyldiphenyliodonium hexafluorophosphate, triphenylthionium hexafluorophosphate, triphenylthionium hexafluoroantimonate, diphenyl-(4-phenylthionium)phenylthionium hexafluorophosphate, diphenyl-(4-phenylthionium)phenylthionium hexafluoroantimonate, and 4-isobutylphenyl-4'-methylphenyliodonium hexafluorophosphate; The photosensitizer includes at least one of curcumin, demethylcurcumin, bis-demethylcurcumin, demethoxycurcumin, and bis-demethoxycurcumin. The fluorescent agent includes 9,10-diphenylanthracene; The oxalate ester includes at least one of diphenyl oxalate, bis(4-methoxyphenyl)oxalate, bis(2,4,6-trichlorophenyl)oxalate, bis(2,4-dinitrophenyl)oxalate, and bis(2,4,5-trichlorophenyl-6-carbonyl-pentoxyphenyl)oxalate.

2. The silicone sealant according to claim 1, characterized in that, By weight, component A comprises 60-100 parts of α,ω-dihydroxypolydimethylsiloxane and 4-8 parts of peroxide; component B comprises 60-100 parts of dimethyl silicone oil, 60-90 parts of crosslinking agent, 6-10 parts of photoacid generator, 4-8 parts of photosensitizer, 10-16 parts of oxalate ester and 4-8 parts of fluorescent agent.

3. The silicone sealant according to claim 1, characterized in that, The peroxide includes hydrogen peroxide.

4. The silicone sealant according to claim 1, characterized in that, The peroxide is a peroxide solution with a concentration of 27-55%.

5. The silicone sealant according to claim 1, characterized in that, Component A further includes at least one of a plasticizer and a first filler; and / or, component B further includes at least one of a second filler and a coupling agent.

6. The silicone sealant according to claim 5, characterized in that, The plasticizer includes dimethyl silicone oil; and / or, the first filler includes at least one of calcium powder and silica; and / or, the second filler includes carbon black; and / or, the coupling agent includes a silane coupling agent.

7. The silicone sealant according to claim 5, characterized in that, Component A further includes a plasticizer and a first filler; component B further includes a second filler and a coupling agent; and by weight, component A includes 60-100 parts of α,ω-dihydroxypolydimethylsiloxane, 4-8 parts of peroxide, 8-14 parts of plasticizer, and 60-100 parts of the first filler; component B includes 60-100 parts of dimethyl silicone oil, 60-90 parts of crosslinking agent, 6-10 parts of photoacid-producing agent, 4-8 parts of photosensitizer, 10-16 parts of oxalate ester, 4-8 parts of fluorescent agent, 20-40 parts of the second filler, and 10-30 parts of coupling agent.

8. The method for preparing the silicone sealant according to any one of claims 5-7, characterized in that, Includes the following steps: The raw material components of component A are mixed to obtain component A; The raw material components of component B are mixed to obtain component B; component A and component B are mixed to obtain the silicone sealant.

9. The preparation method according to claim 8, characterized in that, The preparation steps of component B are as follows: first, the second filler and dimethyl silicone oil are mixed and dehydrated under reduced pressure, and then the remaining components are added to obtain component B.

10. The application of the silicone sealant according to any one of claims 1-7 in the field of sealing and bonding.

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