Ultraviolet-moisture dual deep curing organic silicon composition and preparation method thereof

Abstract

The invention relates to an ultraviolet-moisture dual deep curing organic silicon composition, which is prepared from the following raw materials in parts by mass: 100 parts of acrylate-terminated polysiloxane, 0 to 20 parts of inert diluent, 5 to 10 parts of reactive diluent, 5 to 10 parts of macromolecular photoinitiator, 0 to 10 parts of white carbon black, 1 to 5 parts of alkoxy crosslinking agent, 0.3 to 2 parts of coupling agent and 0.4 to 1 part of moisture curing catalyst. The structural formula of the macromolecular photoinitiator is # imgabs0 #, m is an integer, and m is more than or equal to 50 and less than or equal to 150. The macromolecular photoinitiator is matched with the matrix resin and the reactive diluent, so that the curing depth reaches 25 mm or above when UV irradiation is carried out for 60 s.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to an ultraviolet-moisture dual deep-curing organic silicon composition and a preparation method thereof. Background Art

[0002] UV-moisture dual-curing products can be quickly cured under UV irradiation, and areas that are not exposed to UV light can be cured by moisture, which has a wider range of applications than pure UV-cured products. Chinese patent CN106433453A discloses the preparation method and application of UV-moisture dual-curing solvent-free anti-fouling flashover coatings. By using substances containing both acrylate bonds and alkoxy bonds to end-cap polydimethylsiloxane, a main polymer that can be cured by both UV and moisture is obtained. The final anti-fouling flashover coating has the advantages of short curing time, smooth surface, good hydrophobic migration and high self-cleaning properties, and greatly improves the tensile strength and elongation at break of the cured product. Chinese patent CN114409905A discloses an acrylate-modified silicone resin and its application in UV / moisture dual-curing silicone conformal coating. By reacting hydroxy silicone oil, double-bond silane coupling agent, deionized water and moisture curing catalyst under certain conditions, a silicone resin containing both functionalized double bond groups and silanol groups in its structure is obtained. The silicone resin is widely used in bonding and potting in the fields of electronic appliances and lighting fixtures.

[0003] The above patents are all dual-curing solutions of UV and moisture. Although each has its own advantages, none of them involve the investigation of curing depth. When the depth of electronic components is large, if the product cannot be deeply cured, it will not be applicable. Generally, the maximum depth of moisture curing is 6-7mm. If it is deeper, it must rely on UV curing. However, in the prior art, UV curing generally uses organic small molecule initiators, which are easy to migrate and thus affect the curing depth; especially in the silicone system, the polarity of the organic small molecule initiator is quite different from that of the silicone material, and the two have poor compatibility. The initiator is unevenly dispersed in the system, which further affects the light curing efficiency; therefore, in the common silicone resin system, it is difficult to reach a curing depth of more than 20mm, which limits the application of silicone resin. Summary of the invention

[0004] The purpose of the present invention is to provide a UV-moisture dual deep curing silicone composition and a preparation method thereof, so as to solve the problem that the curing depth of the silicone resin system in the above-mentioned prior art is difficult to reach more than 20mm. The silicone composition in the present invention can be cured by UV light and moisture, and the main structure is silicone resin, which has excellent high and low temperature resistance and durability, and can be used for bonding and potting of various electronic components, especially for occasions where the curing depth is more than 20mm.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A UV-moisture dual deep-curing silicone composition comprises the following raw materials in parts by weight:

[0007]

[0008] The macromolecular photoinitiator has the following structural formula:

[0009]

[0010] wherein m is an integer, 50≤m≤150, preferably 50≤m≤100; R a is selected from CH3-, CH3CH2- or CH3CH2CH2-, R b and R c Independently selected from one of the following structures:

[0011]

[0012] R d and R e Independently selected from H, CH3O-, CH3CH2O- or CH3CH2CH2O-.

[0013] The curing depth of the silicone composition affects its wide application. The deep curing described in the present invention refers to the curing depth of the silicone composition under ultraviolet light for 60 seconds being more than 20mm. Compared with small molecule initiators, macromolecular photoinitiators have the advantages of being difficult to migrate and having low odor. The present invention adopts an alkoxy-containing small molecule photoinitiator to react with α, ω-dihydroxy polysiloxane, thereby introducing a photoinitiating group into the main chain of the silicone macromolecule to form a macromolecular photoinitiator, which overcomes the disadvantage that the curing depth of small molecule photoinitiators is difficult to reach more than 20mm due to easy migration. In addition, the degree of polymerization of the macromolecular photoinitiator has a great influence on the degree of control of the photocuring reaction. If the degree of polymerization is too small, there is still the problem of easy migration; if the degree of polymerization is too large, the viscosity is too large, the process is more difficult to implement and the initiation efficiency will also be reduced. Therefore, the degree of polymerization of the general macromolecular photoinitiator in the prior art is below 50. The degree of polymerization of the macromolecular initiator prepared by the present invention is 50-150. The inventors unexpectedly found that it has a high matching degree with the overall system, is not easy to migrate, has a high initiation efficiency, and is easy to implement in the process. The possible reason is that it has a similar structure to the main resin acrylate-terminated polysiloxane and the active diluent, and has good compatibility. The matching of the macromolecular photoinitiator in the present invention with the main resin and the active diluent ultimately achieves a curing depth of more than 20 mm when UV irradiated for 60 seconds. At the same time, it is not easy to volatilize and has almost no taste.

[0014] Furthermore, the macromolecular photoinitiator is obtained by reacting α,ω-dihydroxy polysiloxane with an alkoxy-containing small molecule photoinitiator in a mass ratio of 100:(5-15).

[0015] Furthermore, the α,ω-dihydroxy polysiloxane is at least one of α,ω-dihydroxy polydimethylsiloxane, α,ω-dihydroxy polydiethylsiloxane and α,ω-dihydroxy polydipropylsiloxane.

[0016] Furthermore, the alkoxy-containing small molecule photoinitiator is 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2,2-dimethoxyacetophenone, 2,2-diethoxyacetophenone, 2-methoxy-2-phenylacetophenone, 3,3'-dimethyl-4-methoxybenzophenone, 2,4,6-trimethylbenzoylphenylphosphinate, 2-(4-methoxyphenyl)-4,6 -bis(trichloromethyl)-S-triazine, 2,4-bis(trichloromethyl)-6-(2,4-dimethoxy)phenylvinyl-S-triazine; preferably 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2,2-dimethoxyacetophenone, 2,2-diethoxyacetophenone, 2-methoxy-2-phenylacetophenone or 3,3'-dimethyl-4-methoxybenzophenone.

[0017] Furthermore, the macromolecular photoinitiator is prepared by a preparation method comprising the following steps: α, ω-dihydroxy polysiloxane and an alkoxy-containing small molecule photoinitiator are reacted at 20 to 30° C. for 10 to 30 minutes under the catalysis of an alkali metal alcohol solution with a concentration of 2 to 5 wt%, and then an organic acid is added for neutralization reaction until the pH is 6.5-7.5.

[0018] Preferably, the amount of the alkali metal alcohol solution is 0.2-0.5wt% of α,ω-dihydroxypolysiloxane; the alkali metal is at least one of potassium hydroxide and sodium hydroxide; the alcohol is at least one of methanol, ethanol and propanol; the organic acid is at least one of formic acid, acetic acid and oxalic acid; and the neutralization reaction time is 10-30min.

[0019] Furthermore, the structural formula of the acrylate-terminated polysiloxane is as follows:

[0020]

[0021] Wherein, n is an integer, 100≤n≤2000, preferably 1000≤n≤2000; R1 is selected from CH3-, CH3CH2- or CH3CH2CH2-; R2 is selected from CH3O-, CH3CH2O- or CH3CH2CH2O-; R3 is selected from -CH2- or -CH2CH2CH2-; R4 is selected from H-, CH3-, CH3CH2- or CH3CH2CH2-; Preferably, the acrylate-terminated polysiloxane is obtained by reacting α, ω-dihydroxy polysiloxane with an acryloxy silane coupling agent in a mass ratio of 100:(1 to 6).

[0022] Preferably, the acryloxysilane coupling is at least one of 3-(methacryloyloxy)methyltrimethoxysilane, 3-(methacryloyloxy)propyltrimethoxysilane, 3-(methacryloyloxy)propyltriethoxysilane, 3-(acryloyloxy)propyltrimethoxysilane, 3-(methacryloyloxy)propylmethyldimethoxysilane, and 3-acetoxypropyltrimethoxysilane.

[0023] Preferably, the acrylate-terminated polysiloxane is prepared by a preparation method comprising the following steps: coupling α, ω-dihydroxy polysiloxane with acryloxysilane, reacting at 60° C. to 80° C. for 0.5 to 2 hours under the action of a catalyst, and removing alcohol low-boiling products at 80 to 100° C. under vacuum after the reaction is completed; more preferably, the catalyst is butanone oxime, and the amount of the catalyst is 0.1 to 0.5 wt% of the α, ω-dihydroxy polysiloxane.

[0024] Furthermore, the inert diluent is dimethyl silicone oil, and the viscosity at 25° C. is 1 to 100 mPa.s, preferably 5 to 50 mPa.s.

[0025] Furthermore, the active diluent is at least one of 3-(methacryloyloxy)methyltrimethoxysilane, 3-(methacryloyloxy)propyltrimethoxysilane, 3-(methacryloyloxy)propyltriethoxysilane, 3-(acryloyloxy)propyltrimethoxysilane, 3-(methacryloyloxy)propylmethyldimethoxysilane, and 3-acetoxypropyltrimethoxysilane.

[0026] Furthermore, the white carbon black is gas phase white carbon black or precipitated white carbon black, and the specific surface area of ​​the white carbon black is 100 to 400 m 2 / g, water content <0.1wt%; preferably specific surface area of ​​100-200m 2 / g, water content <0.05wt%. The water content can be controlled by drying, for example, drying at 80-100°C for 12-24h.

[0027] Furthermore, the alkoxy crosslinking agent is at least one of methyltrimethoxysilane, vinyltrimethoxysilane, tetraethoxysilane, phenyltrimethoxysilane and vinyltriethoxysilane.

[0028] Furthermore, the coupling agent is at least one of aminopropyltrimethoxysilane, γ-glycidyloxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane and bis-(γ-trimethoxysilylpropyl)amine.

[0029] Furthermore, the moisture curing catalyst is at least one of an organic tin catalyst and an organic titanium catalyst. The organic tin catalyst is, for example, dibutyltin dilaurate, dioctyltin dilaurate, dibutyltin dicarboxylate or stannous octoate; the organic titanium catalyst is, for example, a titanium chelate of ethyl acetoacetate, a diisopropoxy titanium bis(ethyl acetoacetate) chelate or a 1,3-propanedioxy titanium bis(ethyl acetoacetate) chelate.

[0030] The present invention also provides a method for preparing the above-mentioned UV-moisture dual deep-curing silicone composition, comprising the following preparation steps:

[0031] S1) adding acrylate-terminated polysiloxane, an inert diluent, a reactive diluent and a macromolecular photoinitiator into a stirring vessel, stirring and mixing under vacuum to obtain a mixture A;

[0032] S2) adding white carbon black to mixed material A, stirring and mixing under vacuum, and then adding an alkoxy crosslinking agent to a stirred tank and stirring and mixing to obtain mixed material B;

[0033] S3) adding a coupling agent and a moisture curing catalyst into the mixture B, stirring and mixing under vacuum to obtain a UV-moisture dual deep-curing silicone composition.

[0034] Preferably, in step S1), during the stirring and mixing, the rotation speed is 100 to 500 r / min and the mixing time is 5 to 10 min; and / or

[0035] In step S2), the mixing speed after adding white carbon black to the mixture A is 500-800 r / min, and the mixing time is 20-40 min; after adding the alkoxy crosslinking agent, the mixing speed is 100-500 r / min, and the mixing time is 5-10 min; and / or

[0036] In step S3), the mixing speed is 100-500 r / min, and the mixing time is 5-10 min.

[0037] Preferably, the vacuum degree in step S1), step S2) and step S3) is less than -0.09Mpa.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1) The present invention uses an alkoxy-containing small molecule photoinitiator to react with α, ω-dihydroxy polysiloxane, thereby introducing a photoinitiator group into the main chain of the organosilicon macromolecule to form a macromolecule photoinitiator with a polymerization degree of 50 to 150, which overcomes the disadvantage that the curing depth of small molecule photoinitiators is difficult to reach more than 20mm due to easy migration. The macromolecule photoinitiator in the present invention has a high matching degree with the overall system, is not easy to migrate, has a high initiation efficiency, and is easy to implement in terms of process; its matching with the main resin and the active diluent ultimately achieves a curing depth of more than 25mm when UV irradiated for 60s.

[0040] 2) The active diluent of the present invention is an acryloxy silane coupling agent, which has less odor than conventional acrylate monomers; meanwhile, the initiator is a macromolecular photoinitiator, which is not easy to migrate or volatilize; therefore, the preparation process of the present invention has no irritating odor and is safer. DETAILED DESCRIPTION

[0041] In order to further illustrate the present invention, a UV-moisture dual deep-curing silicone composition and a preparation method thereof provided by the present invention are described in detail below in conjunction with specific embodiments, but it is not intended to be construed as limiting the scope of protection of the present invention.

[0042] Unless otherwise specified, the “parts” described in the embodiments of the present invention are all parts by mass, and the reagents used are all commercially available reagents in the art.

[0043] α,ω-dihydroxypolydimethylsiloxane I with a polymerization degree of about 20, α,ω-dihydroxypolydimethylsiloxane II with a polymerization degree of about 50, α,ω-dihydroxypolydimethylsiloxane III with a polymerization degree of about 100, α,ω-dihydroxypolydimethylsiloxane IV with a polymerization degree of about 150, α,ω-dihydroxypolydimethylsiloxane V with a polymerization degree of about 1000, and α,ω-dihydroxypolydimethylsiloxane VI with a polymerization degree of about 2000 are all selected from Jiangxi Lanxing Xinghuo Silicone Co., Ltd.

[0044] Dimethyl silicone oil, with a viscosity of 20-25 mPa.s at 25°C, is selected from Jiangxi Lanxing Xinghuo Silicone Co., Ltd.

[0045] White fumed carbon black was purchased from Cabot with a specific surface area of ​​200 m 2 / g.

[0046] Preparation of acrylic acid terminated polysiloxane

[0047] Preparation Example a1

[0048] 100 parts of α, ω-dihydroxy polydimethylsiloxane VI with a degree of polymerization of 2000 and 1 part of 3-(methacryloyloxy)methyltrimethoxysilane were mixed, and reacted at 60°C for 1 hour under the catalysis of 0.2 parts of butanone oxime. After the reaction was completed, the alcohol low-boiling products were removed at 100°C under vacuum to obtain acrylic acid-terminated polysiloxane a1.

[0049] Preparation Example a2

[0050] The rest is the same as Preparation Example a1, except that:

[0051] α,ω-dihydroxypolydimethylsiloxane V having a degree of polymerization of about 1000 is used to replace α,ω-dihydroxypolydimethylsiloxane VI having a degree of polymerization of 2000;

[0052] The amount of 3-(methacryloyloxy)methyltrimethoxysilane is 3 parts;

[0053] Finally, acrylic acid-terminated polysiloxane a2 is obtained.

[0054] Preparation Example a3

[0055] The rest is the same as Preparation Example a1, except that:

[0056] α,ω-dihydroxypolydimethylsiloxane III having a degree of polymerization of about 100 is used to replace α,ω-dihydroxypolydimethylsiloxane VI having a degree of polymerization of 2000;

[0057] The amount of 3-(methacryloyloxy)methyltrimethoxysilane is 6 parts;

[0058] Finally, acrylic acid-terminated polysiloxane a3 is obtained.

[0059] Preparation of macromolecular photoinitiators

[0060] Preparation Example b1

[0061] 100 parts of α, ω-dihydroxypolydimethylsiloxane II with a polymerization degree of about 50 and 15 parts of 2,2-dimethoxyacetophenone were mixed, and reacted at 20°C for 20 minutes under the catalysis of 0.5 parts of 3wt% potassium hydroxide methanol solution, and the reaction was vacuumed during the reaction process; then 0.02 parts of formic acid were added for neutralization reaction for 30 minutes to obtain macromolecular photoinitiator b1.

[0062] Preparation Example b2

[0063] The rest is the same as Preparation Example b1, except that:

[0064] Replacing α,ω-dihydroxypolydimethylsiloxane II having a degree of polymerization of about 50 with α,ω-dihydroxypolydimethylsiloxane III having a degree of polymerization of about 100;

[0065] The amount of 2,2-dimethoxyacetophenone is 8 parts;

[0066] Finally, the macromolecular photoinitiator b2 is obtained.

[0067] Preparation Example b3

[0068] The rest is the same as Preparation Example b1, except that:

[0069] Replace α,ω-dihydroxypolydimethylsiloxane II having a degree of polymerization of about 50 with α,ω-dihydroxypolydimethylsiloxane IV having a degree of polymerization of about 150;

[0070] The amount of 2,2-dimethoxyacetophenone is 5 parts;

[0071] Finally, the macromolecular photoinitiator b3 is obtained.

[0072] Preparation Example b4

[0073] The rest is the same as Preparation Example a1, except that 2-(4-methoxyphenyl)-4,6-bis(trichloromethyl)-S-triazine is used instead of 2,2-dimethoxyacetophenone to finally obtain the macromolecular photoinitiator b4.

[0074] Comparative Preparation Example b1

[0075] The rest is the same as Preparation Example a1, except that α, ω-dihydroxypolydimethylsiloxane I with a polymerization degree of about 20 is used to replace α, ω-dihydroxypolydimethylsiloxane II with a polymerization degree of 50, and finally a macromolecular photoinitiator c is obtained.

[0076] Example 1

[0077]

[0078] The organosilicon composition was prepared by the following preparation method according to the amount of each raw material in the above table:

[0079] S1) adding acrylate-terminated polysiloxane, inert diluent dimethyl silicone oil, reactive diluent 3-(methacryloyloxy)propyltrimethoxysilane, and macromolecular photoinitiator into a stirring kettle and stirring and mixing at 300 r / min for 5 min, maintaining a vacuum degree of <-0.09 MPa during the stirring process, to obtain a mixture A;

[0080] S2) adding methyltrimethoxysilane to mixed material A, stirring and mixing at 300 r / min for 5 min, and maintaining a vacuum degree of <-0.09 MPa during the stirring process to obtain mixed material B;

[0081] S3) Adding aminopropyltrimethoxysilane and dibutyltin dilaurate into mixed material B, stirring and mixing at 300 r / min for 10 min, maintaining a vacuum degree of <-0.09 MPa during the stirring process, to obtain a UV-moisture dual deep-curing silicone composition.

[0082] Example 2

[0083]

[0084] The organosilicon composition was prepared by the following preparation method according to the amount of each raw material in the above table:

[0085] S1) adding acrylate-terminated polysiloxane, inert diluent dimethyl silicone oil, reactive diluent 3-(methacryloyloxy)propyltrimethoxysilane, and macromolecular photoinitiator into a stirring kettle and stirring and mixing at 300 r / min for 5 min, maintaining a vacuum degree of <-0.09 MPa during the stirring process, to obtain a mixture A;

[0086] S2) adding the white carbon black dried in an oven at 80° C. for 12 h to the mixed material A, and stirring and mixing at 800 r / min for 25 min; then adding methyltrimethoxysilane to the stirring kettle, and stirring and mixing at 300 r / min for 5 min, and maintaining the vacuum degree <-0.09 Mpa during the whole stirring process, to obtain a mixed material B;

[0087] S3) Add bis-(γ-trimethoxysilylpropyl)amine and diisopropoxytitanium bis(ethyl acetoacetate) chelate to mixed material B, stir and mix at 300 r / min for 10 min, and keep the vacuum degree <-0.09 MPa during the stirring process to obtain a UV-moisture dual deep-curing silicone composition.

[0088] Example 3

[0089]

[0090]

[0091] The preparation method is the same as Example 2.

[0092] Example 4

[0093]

[0094] The preparation method is the same as Example 2.

[0095] Comparative Example 1

[0096] The rest is the same as Example 1, except that the macromolecular photoinitiator c prepared in Comparative Preparation Example b1 is used instead of the macromolecular photoinitiator b1.

[0097] Comparative Example 2

[0098] The rest is the same as Example 1, except that a small molecule photoinitiator 2,2-diethoxyacetophenone is used instead of the macromolecule photoinitiator b1.

[0099] The UV-moisture dual deep-cure silicone compositions prepared in the above examples and comparative examples were subjected to the following performance tests, and the results are shown in Table 1.

[0100] Skinning time under UV: from the start of UV light irradiation until a layer of skin forms on the surface. Touch the surface lightly with your finger and lift it up to see if a skin is formed.

[0101] UV-60s curing depth: Pour the product into the egg tart cup, the thickness is 60mm, the light source is a medium pressure mercury lamp, the power is 100mW / cm 2 Irradiate under UV for 60 seconds, then take the product out of the egg tart cup and measure the thickness of the upper cured part;

[0102] Hardness after UV-60s: Shore A hardness is tested according to GB / T528;

[0103] Adhesion strength after UV-60s: Pour the product on the PCB board, and after UV irradiation and room temperature curing, peel the product off the PCB board and calculate the percentage of the area with residual glue on the PCB board surface to the total area of ​​the PCB board;

[0104] Surface drying time under moisture: Tested according to GB / T 13477, moisture curing conditions are: temperature 23°C, humidity 55%.

[0105] Table 1 Performance test

[0106]

[0107] As can be seen from Table 1, compared with the comparative example, the UV-moisture dual deep-curing silicone composition prepared in the embodiment of the present invention has a significantly improved UV-60s curing depth of more than 25mm; the skinning time under UV is also short, not exceeding 10s; at the same time, the hardness is high and the adhesion is good, and the next process can be directly entered without waiting; and the surface drying time under moisture is not significantly extended, indicating that the introduction of the macromolecular photoinitiator in the present invention makes the UV curing efficiency high, significantly improves the curing depth, and does not adversely affect the moisture curing. Although the curing depth of the macromolecular initiator used in Comparative Example 1 has been improved, it is still less than 20mm; while Comparative Example 2 uses a small molecule photoinitiator, and its curing depth is significantly lower, less than 10mm, and its hardness and adhesion are correspondingly lower.

[0108] In addition, the active diluent of the present invention is an acryloxy silane coupling agent, which has less odor than conventional acrylate monomers; and the initiator is a macromolecular photoinitiator, which is not easy to migrate and volatilize; therefore, the preparation process of the present invention has no irritating odor and is safer.

Claims

1. A UV-moisture dual deep curing silicone composition, characterized in that: The invention comprises the following raw materials in parts by weight: The structural formula of the macromolecular photoinitiator is as follows: Wherein, m is an integer, 50≤m≤150; R a is selected from CH3-, CH3CH2- or CH3CH2CH2-, R b and R c Independently selected from one of the following structures: R d and R e Independently selected from H, CH3O-, CH3CH2O- or CH3CH2CH2O-.

2. The UV-moisture dual deep curing silicone composition according to claim 1, characterized in that: 50≤m≤100。 3. The UV-moisture dual deep curing silicone composition according to claim 1, characterized in that: The macromolecular photoinitiator is obtained by reacting α,ω-dihydroxy polysiloxane with a small molecular photoinitiator containing an alkoxy group in a mass ratio of 100:(5-15).

4. The UV-moisture dual deep curing silicone composition according to claim 3, characterized in that: The α,ω-dihydroxy polysiloxane is at least one of α,ω-dihydroxy polydimethylsiloxane, α,ω-dihydroxy polydiethylsiloxane and α,ω-dihydroxy polydipropylsiloxane; and / or The alkoxy-containing small molecule photoinitiator is 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2,2-dimethoxyacetophenone, 2,2-diethoxyacetophenone, 2-methoxy-2-phenylacetophenone, 3,3'-dimethyl-4-methoxybenzophenone, 2,4,6-trimethylbenzoylphenyl phosphinate, 2-(4-methoxyphenyl)-4,6-bis( At least one of 2,4-bis(trichloromethyl)-6-(2,4-dimethoxy)phenylvinyl-S-triazine, 2,4-bis(trichloromethyl)-6-(2,4-dimethoxy)phenylvinyl-S-triazine; preferably 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2,2-dimethoxyacetophenone, 2,2-diethoxyacetophenone, 2-methoxy-2-phenylacetophenone or 3,3'-dimethyl-4-methoxybenzophenone.

5. The UV-moisture dual deep curing silicone composition according to claim 1, characterized in that: The macromolecular photoinitiator is prepared by a preparation method comprising the following steps: α,ω-dihydroxy polysiloxane and a small molecule photoinitiator containing an alkoxy group are reacted at 20-30°C for 10-30 minutes under the catalysis of an alkali metal alcohol solution with a concentration of 2-5wt%, and then an organic acid is added for neutralization reaction until the pH value is 6.5-7.5; preferably, the amount of the alkali metal alcohol solution used is 0.2-0.5wt% of the α,ω-dihydroxy polysiloxane.

6. The UV-moisture dual deep curing silicone composition according to claim 1, characterized in that: The structural formula of the acrylate-terminated polysiloxane is as follows: Wherein, n is an integer, 100≤n≤2000, preferably 1000≤n≤2000; R1 is selected from CH3-, CH3CH2- or CH3CH2CH2-; R2 is selected from CH3O-, CH3CH2O- or CH3CH2CH2O-; R3 is selected from -CH2- or -CH2CH2CH2-; R4 is selected from H-, CH3-, CH3CH2- or CH3CH2CH2-; Preferably, the acrylate-terminated polysiloxane is obtained by reacting α, ω-dihydroxy polysiloxane with an acryloxy silane coupling agent in a mass ratio of 100:(1 to 6).

7. The UV-moisture dual deep curing silicone composition according to claim 6, characterized in that: The acryloxysilane coupling is at least one of 3-(methacryloxy)methyltrimethoxysilane, 3-(methacryloxy)propyltrimethoxysilane, 3-(methacryloxy)propyltriethoxysilane, 3-(acryloxy)propyltrimethoxysilane, 3-(methacryloxy)propylmethyldimethoxysilane, and 3-acetoxypropyltrimethoxysilane.

8. The UV-moisture dual deep curing silicone composition according to claim 6, characterized in that: The acrylate-terminated polysiloxane is prepared by a preparation method comprising the following steps: coupling α, ω-dihydroxy polysiloxane with acryloxysilane, reacting at 60° C. to 80° C. for 0.5 to 2 hours under the action of a catalyst, and removing alcohol low-boiling products at 80 to 100° C. under vacuum after the reaction is completed; preferably, the catalyst is butanone oxime, and the amount of the catalyst used is 0.1 to 0.5 wt% of the α, ω-dihydroxy polysiloxane.

9. The UV-moisture dual deep curing silicone composition according to claim 1, characterized in that: The inert diluent is dimethyl silicone oil, and the viscosity at 25° C. is 1 to 100 mPa.s; and / or The active diluent is at least one of 3-(methacryloyloxy)methyltrimethoxysilane, 3-(methacryloyloxy)propyltrimethoxysilane, 3-(methacryloyloxy)propyltriethoxysilane, 3-(acryloyloxy)propyltrimethoxysilane, 3-(methacryloyloxy)propylmethyldimethoxysilane and 3-acetoxypropyltrimethoxysilane; and / or The white carbon black is gas phase white carbon black or precipitation white carbon black, and the specific surface area of ​​the white carbon black is 100 to 400 m 2 / g, water content <0.1wt%; and / or The alkoxy crosslinking agent is at least one of methyltrimethoxysilane, vinyltrimethoxysilane, tetraethoxysilane, phenyltrimethoxysilane and vinyltriethoxysilane; and / or The coupling agent is at least one of aminopropyltrimethoxysilane, γ-glycidyloxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane and bis-(γ-trimethoxysilylpropyl)amine; and / or The moisture curing catalyst is at least one of an organic tin catalyst and an organic titanium catalyst.

10. The method for preparing the UV-moisture dual deep curing silicone composition according to any one of claims 1 to 9, characterized in that: The method comprises the following preparation steps: S1) adding acrylate-terminated polysiloxane, an inert diluent, a reactive diluent and a macromolecular photoinitiator into a stirring vessel, stirring and mixing under vacuum to obtain a mixture A; S2) adding white carbon black to mixed material A, stirring and mixing under vacuum, and then adding an alkoxy crosslinking agent to a stirred tank and stirring and mixing to obtain mixed material B; S3) adding a coupling agent and a moisture curing catalyst to the mixture B, stirring and mixing under vacuum to obtain a UV-moisture dual deep-curing silicone composition; Preferably, in step S1), during the stirring and mixing, the rotation speed is 100 to 500 r / min and the mixing time is 5 to 10 min; and / or In step S2), the mixing speed after adding white carbon black to the mixture A is 500-800 r / min, and the mixing time is 20-40 min; after adding the alkoxy crosslinking agent, the mixing speed is 100-500 r / min, and the mixing time is 5-10 min; and / or In step S3), the mixing speed is 100-500 r / min, and the mixing time is 5-10 min.

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