Photocurable compositions and their use

Abstract

The application discloses a photocuring composition and application thereof, and belongs to the technical field of photocuring. The photocuring composition comprises 35-95% of photocuring oligomers, 5-50% of photocuring active monomers and 3-15% of photoinitiators. The photoinitiators at least comprise 2-10% of II compounds of a general formula: R1 and R2 are selected from methyl, ethyl, propyl or isopropyl, and are para-substituted. The photocuring oligomers at least comprise at least one of bifunctional or trifunctional polyether type polyurethane acrylate oligomers. The photocuring active monomers at least comprise monofunctional and bifunctional photocuring active monomers. The monofunctional monomers comprise PHEA, IBOA, isodecyl acrylate, isooctyl acrylate, OPPEA, nonyl phenol polyoxyethylene ether acrylate and N-vinyl caprolactam. The bifunctional monomers comprise HDDA, TPGDA and DPGDA. The composition improves the curing speed and solves the volatilization problem in the drawing process.

Description

[0001] This application is a divisional application of the invention patent application with application number 202310541022.8, application date May 12, 2023, and invention title "Photocurable Composition and Its Application". Technical Field

[0002] This invention relates to the field of photocuring technology, and more particularly to photocurable compositions and their applications. Background Technology

[0003] Optical fiber is a key material for the construction of information industry infrastructure, especially as a key transmission carrier and core component of optical fiber communication, and plays an important supporting role in the national economy.

[0004] Optical fiber is a cylindrical waveguide that confines and guides light waves forward along its axis within or near its surface. Generally, optical fibers consist of a glass core, a glass cladding, and an organic coating. Single-mode or multimode optical fibers for communication typically have a glass portion composed of high-purity silicon dioxide and germanium dioxide doped with. Quartz glass fibers have high longitudinal tensile strength, but they are brittle and easily break when bent. Furthermore, quartz glass itself is not resistant to moisture, acids, alkalis, or corrosive gases or liquids in the environment. To make quartz glass fibers practical, one or more layers of organic polymer materials (generally called optical fiber coating materials) are coated onto the outer surface of the glass fiber. This effectively protects the quartz glass fiber, improving both its environmental resistance and optical performance.

[0005] With the development of the optical fiber industry, photocurable coatings are increasingly being used in optical fibers. Currently, the inner and outer coatings, coloring layers, parallel band layers, and tight-buffered layers of optical fibers are all formed by photocurable coating resins under specific process conditions through ultraviolet light irradiation.

[0006] In existing technologies, diphenyl ethers are used in photocurable compositions for optical fiber materials. (2,4,6) Trimethylbenzoyl phosphorus oxyphosphate (also known as photoinitiator TPO) is used as a photoinitiator, and it has a photoinitiator at 200 nm. The 400nm ultraviolet band has a wide absorption range, high initiation efficiency, and low yellowing after curing, making it particularly suitable for optical fiber coating production that requires rapid curing. Due to the current development of LED curing, the wavelength of LED ultraviolet light sources is generally relatively singular. The three most commonly used wavelengths in optical fibers are 365nm, 385nm, and 395nm, and the main photoinitiator used is TPO.

[0007] With the development of optical fiber technology, optical fiber and cable manufacturers are demanding increasingly higher drawing speeds to increase production capacity. High-speed drawing places higher demands on optical fiber cooling, coating, and curing, as well as on the resin used for coating. Due to the increased optical fiber speed, the time the curing composition is exposed to light during curing is shortened. During resin curing, the amount of volatiles released increases. As these volatiles accumulate, the surface of the photocuring equipment is easily covered, especially the surface of the photocuring lamp cover. Once covered, this affects the curing effect of the photocuring composition, ultimately impacting the performance of the optical fiber.

[0008] Chinese invention patent application CN101549962A discloses a method and apparatus for removing volatile substances cured by coating during optical fiber drawing, and Chinese utility model patent CN214654487U discloses an apparatus for removing volatile substances cured by coating during optical fiber drawing. Both indicate that optical fiber manufacturers hope to reduce volatile substances by adjusting equipment. Summary of the Invention

[0009] In view of this, the present invention provides a photocurable composition and its application, in which a more environmentally friendly and efficient photoinitiator is used to replace the photoinitiator TPO, and in combination with other substances in the formulation, the volatilization problem of the coating under high-speed wire drawing conditions is also effectively improved.

[0010] Specifically, the following technical solutions are included: In a first aspect, a photocurable composition is provided, the photocurable composition comprising: 35-95% by weight of a photocurable oligomer, 5-50% by weight of a photocurable active monomer and 3-15% by weight of a photoinitiator, based on the weight of the photocurable composition. The photoinitiator comprises at least a compound as shown in Formula II, and the compound shown in Formula II accounts for 2%-10% by weight of the photocurable composition.

[0011] R1 and R2 may be the same or different, and each is independently selected from methyl, ethyl, propyl or isopropyl; and the substitution sites of R1 and R2 are para-substituted. The photocurable oligomer includes at least a polyether polyurethane acrylate oligomer, and the polyether polyurethane acrylate oligomer is selected from at least one of a difunctional polyether polyurethane acrylate oligomer or a trifunctional polyether polyurethane acrylate oligomer. The photocurable active monomer includes at least a monofunctional photocurable active monomer and a difunctional photocurable active monomer, wherein the weight percentage of the monofunctional photocurable active monomer is at most 36%. The monofunctional photocurable reactive monomer includes acrylic acid. 2 Phenoxyethyl ester, isobornyl acrylate, isodecyl acrylate, isooctyl acrylate, polyethylene glycol o-phenyl ether acrylate, nonylphenol polyoxyethylene ether acrylate, N Vinylcaprolactam; The bifunctional photocurable active monomer comprises 1,6 Hexanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate.

[0012] In some possible implementations, the photocurable oligomer also includes an epoxy acrylate oligomer.

[0013] In some possible implementations, the epoxy acrylate oligomer is one or more of a monofunctional epoxy acrylate oligomer, a difunctional epoxy acrylate oligomer, or a trifunctional epoxy acrylate oligomer.

[0014] In some possible implementations, the polyurethane acrylate oligomer is obtained by reacting a diisocyanate with a hydroxyl-containing acrylate.

[0015] In some possible implementations, the epoxy acrylate oligomer is obtained by reacting bisphenol A epoxy resin with a carboxyl-containing photopolymerizable compound.

[0016] In some possible implementations, the photoinitiator further includes one or more of the following substances: phenylbis(2,4,6) Trimethylbenzoyl)phosphine oxide, 1 Hydroxycyclohexylphenyl ketone, 2 hydroxyl 2 methyl 1 Phenyl 1 Acetone, benzophenone, 2,2 Dimethoxy 2 phenylacetophenone, 2 hydroxyl 4' (2 Hydroxyethoxy 2 Methyl acetone, 2 Isopropylthioxanthone, 2,4 Diethylthiazolidinone.

[0017] In some possible implementations, the photocurable composition further includes an additive selected from one or more of silane coupling agents, defoamers, dispersants, leveling agents, and active amine co-initiators, wherein the additive accounts for 0.01% by weight. 10% by weight.

[0018] In some possible implementations, the photocurable composition further includes a colorant, wherein the colorant comprises 0.1% by weight. 8% by weight.

[0019] In a second aspect, the photocurable composition described in the first aspect is provided for use as an optical fiber coating or optical fiber coloring coating.

[0020] In some possible implementations, the fiber coating is selected from at least one of fiber inner layer coating, fiber outer layer coating, fiber parallel strip coating, or fiber tight-buffer coating.

[0021] Thirdly, an optical fiber coating or optical fiber coloring coating is provided, the optical fiber coating or optical fiber coloring coating comprising the photocurable composition described in the first aspect.

[0022] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: The photocurable composition provided in this invention uses a more environmentally friendly and efficient photoinitiator to replace the photoinitiator TPO. Combined with other substances in the formulation, it effectively improves the volatilization problem of the coating under high-speed fiber drawing conditions. When this photocurable composition is applied to optical fiber coating, it can effectively increase the curing speed and simultaneously improve the volatilization problem that occurs during the fiber drawing process. Detailed Implementation

[0023] In a first aspect, a photocurable composition is provided, comprising: 35-95% by weight of a photocurable oligomer, 5-50% by weight of a photocurable active monomer, and 3-15% by weight of a photoinitiator, based on the weight of the photocurable composition.

[0024] The photoinitiator includes at least a compound as shown in Formula II, and the compound shown in Formula II accounts for 2% to 10% by weight of the photocurable composition.

[0025]

[0026] R1 and R2 may be the same or different, and each is independently selected from methyl, ethyl, propyl, or isopropyl; and the substitution sites of R1 and R2 are para-substituted. Introducing the above-mentioned alkyl groups into the structure of the photoinitiator further improves the thermal stability of the initiator, reducing the volatilization of the initiator during photocuring.

[0027] The photocurable oligomer includes at least a polyether-type polyurethane acrylate oligomer, and the polyether-type polyurethane acrylate oligomer is selected from at least one of a difunctional polyether-type polyurethane acrylate oligomer or a trifunctional polyether-type polyurethane acrylate oligomer.

[0028] The photocurable active monomers include at least monofunctional photocurable active monomers and difunctional photocurable active monomers, wherein the weight percentage of monofunctional photocurable active monomers is capped at 36%.

[0029] Monofunctional photocurable reactive monomers include acrylic acid 2 Phenoxyethyl ester, isobornyl acrylate, isodecyl acrylate, isooctyl acrylate, polyethylene glycol o-phenyl ether acrylate, nonylphenol polyoxyethylene ether acrylate, N Vinylcaprolactam.

[0030] Bifunctional photocurable reactive monomers include 1,6 Hexanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate.

[0031] The photocurable composition provided in this invention uses a more environmentally friendly and efficient photoinitiator to replace the photoinitiator TPO. Combined with other substances in the formulation, it effectively improves the volatilization problem of the coating under high-speed fiber drawing conditions. When this photocurable composition is applied to optical fiber coating, it can effectively increase the curing speed and simultaneously improve the volatilization problem that occurs during the fiber drawing process.

[0032] In some embodiments of the present invention, R1 and R2 are para-substituted methyl groups, respectively.

[0033] Two additional methyl groups are located at the para positions of the two benzene rings connected to the phosphooxy group, forming a σ group with the benzene rings. The π-hyperconjugated structure, compared to the conjugated structure of the benzene ring, σ The π hyperconjugated structure has low conjugation energy and higher activity. Under the condition of free radical formation by light irradiation, it is easier to initiate polymerization, which increases the crosslinking density of the system, thereby improving the curing efficiency and reducing the volatilization of small molecule monomers in the system.

[0034] In some embodiments of the present invention, the photocurable oligomer accounts for 35% by weight of the photocurable composition. 95%, for example, 35% 90%, 40% 90%, 45% 90%, 50% 90%, 55% 90%, 60% 90%, 65% 90％、70％ 90％、75％ 90％、80％ 90％、85％ 90％、35％ 85％、40％ 85％、45％ 85％、50％ 85％、55％ 85％、60％ 85％、65％ 85％、70％ 85％、75％ 85％、80％ 85％、35％ 80％、40％ 80％、45％ 80％、50％ 80％、55％ 80％、60％ 80％、65％ 80％、70％ 80％、75％ 80％、35％ 75％、40％ 75％、45％ 75％、50％ 75％、55％ 75％、60％ 75％、65％ 75％、70％ 75％、35％ 70％、40％ 70％、45％ 70％、50％ 70％、55％ 70％、60％ 70％、65％ 70％、35％ 65％、40％ 65％、45％ 65％、50％ 65％、55％ 65％、60％ 65％、35％ 60％、40％ 60％、45％ 60％、50％ 60％、55％ 60％、35％ 55%, 40% 55%, 45% 55%, 50% 55%, 35% 50%, 40% 50%, 45% 50%, 35% 45% or 40% 45%.

[0035] In some possible implementations, the photocurable oligomer also includes epoxy acrylate oligomers.

[0036] In some possible implementations, the epoxy acrylate oligomer is one or more of a monofunctional epoxy acrylate oligomer, a difunctional epoxy acrylate oligomer, or a trifunctional epoxy acrylate oligomer, preferably a difunctional epoxy acrylate oligomer.

[0037] In some possible implementations, the polyurethane acrylate oligomer is obtained by reacting a diisocyanate with a hydroxyl-containing acrylate.

[0038] During the preparation process, a chain extender is added to the reactants to increase the molecular chain length of the polyurethane acrylate oligomer.

[0039] In some embodiments of the present invention, the chain extender is selected from at least one of polyester diol, alkyl diol, and polyether diol, preferably polyether diol.

[0040] In some embodiments of the present invention, the polyurethane acrylate oligomer can be a single oligomer or a combination of multiple oligomers.

[0041] In some embodiments of the present invention, the diisocyanate is selected from toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), and 4,4'-diisocyanate. Dicyclohexylmethane diisocyanate (HMDI), diphenylmethane diisocyanate (MDI), and hexamethylene diisocyanate (HDI) trimers.

[0042] In some embodiments of the present invention, the hydroxyl-containing acrylate is selected from at least one of hydroxyethyl acrylate (HEA), hydroxypropyl acrylate (HPA), hydroxyethyl methacrylate (HEMA), and hydroxypropyl methacrylate (HPMA).

[0043] In some possible implementations, the epoxy acrylate oligomer is obtained by reacting bisphenol A epoxy resin with a carboxyl-containing photopolymerizable compound.

[0044] Photopolymerizable compounds containing carboxyl groups are compounds that contain a carboxyl group at one end and a photoinitiable double bond at the other end.

[0045] In some embodiments of the present invention, the compound containing a carboxyl group at one end and a photoinitiable double bond at the other end is acrylic acid, methacrylic acid, or a compound obtained by reacting an anhydride with a hydroxyacrylate.

[0046] The acid anhydride is selected from at least one of succinic anhydride, maleic anhydride, phthalic anhydride, and tetrahydrophthalic anhydride.

[0047] The hydroxy acrylate compounds are selected from hydroxyethyl acrylate (HEA), hydroxypropyl acrylate (HPA), hydroxyethyl methacrylate (HEMA), and hydroxypropyl methacrylate (HPMA).

[0048] For photocurable reactive monomers, if a monofunctional photocurable reactive monomer is added, the maximum addition amount is 36% (based on the weight of the photocurable composition). A further preferred maximum is 20% (based on the weight of the photocurable composition). Excessive addition of monofunctional monomers will affect the curing speed and increase volatility.

[0049] In some embodiments of the present invention, the photocurable active monomer further includes a trifunctional photocurable active monomer. The trifunctional photocurable active monomer includes trimethylolpropane triacrylate (TMPTA).

[0050] For photoinitiators, the compound of general formula II accounts for 2%-10% by weight of the photocurable composition, for example, 2%, 3%, 4%, 5%, 6%, 7%, 8% or 9%.

[0051] In some embodiments of the present invention, without the addition of a colorant, the proportion of compound of general formula II in the photocurable composition is preferably 2% by weight. Adding too much (e.g., 6%, 2%, 3%, 4%, or 5%) can cause noticeable yellowing.

[0052] In some possible implementations, the photoinitiator further includes one or more of the following substances: phenylbis(2,4,6) Trimethylbenzoyl)phosphine oxide, 1 Hydroxycyclohexylphenyl ketone, 2 hydroxyl 2 methyl 1 Phenyl 1 Acetone, benzophenone, 2,2 Dimethoxy 2 phenylacetophenone, 2 hydroxyl 4' (2 Hydroxyethoxy 2 Methyl acetone, 2 Isopropylthioxanthone, 2,4 Diethylthiazolidinone.

[0053] In some possible implementations, the photocurable composition further includes an additive selected from one or more of silane coupling agents, defoamers, dispersants, leveling agents, and active amine co-initiators, wherein the additive accounts for 0.01% by weight. 10% by weight.

[0054] Silane coupling agents may include mercaptopropyltrimethoxysilane, 3 Chloropropyltrimethoxysilane.

[0055] Defoamers can include polyether-modified silicone defoamers and non-silicone polymer defoamers.

[0056] Dispersants may include copolymer solutions with acidic groups, such as BYK110; and acrylic front copolymers, such as EFKA4310.

[0057] Leveling agents can include silicone-based leveling agents and acrylate-based leveling agents.

[0058] Active amine co-initiators can include ethylenediamine and amine-modified acrylates, which can further optimize the surface curing effect.

[0059] The photocurable composition comprises 0.01g by weight of the photocurable composition. 10% of the excipient, for example, 0.01% to 5%, 0.05% to 10%, 0.1% to 10%, 0.1% to 5%, 0.5% to 10%, 0.5% to 5%, 1% to 5%, or values ​​within one of these ranges. Specific examples may include 0.01%, 0.05%, 0.1%, 0.25%, 0.5%, 0.75%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or ranges between any two of these values: 1% to 10%, 0.1% to 5%, 0.5% to 10%, 0.5% to 5%, etc.

[0060] In some possible implementations, the photocurable composition further includes a colorant at a weight percentage of 0.1%. 8% by weight.

[0061] The colorant can be an organic or inorganic phase pigment. Preferably, the pigment color can include white, red, yellow, blue, green, purple, or black.

[0062] The type and amount of colorant added can be adjusted as needed according to the coloring requirements.

[0063] The colorant is selected from at least one of the following: titanium dioxide, permanent red, ruby ​​red 4B, benzidine yellow, phthalocyanine blue, phthalocyanine green, permanent violet, and carbon black.

[0064] In some embodiments of the present invention, the colorant is selected from titanium dioxide and phthalocyanine blue.

[0065] After adding the colorant, the absorption of radiation by the colorant will affect the curing effect of the composition. Therefore, the amount of compound of general formula I is further increased to 1. 8% by weight (e.g., 2%, 3%, 4%, 5%, 6%, or 7% by weight) to ensure adequate curing while also improving the volatility of such compositions.

[0066] In some embodiments of the present invention, the applicable light source wavelength range for the photocurable composition is: 200 nm. 450nm.

[0067] Secondly, the photocurable composition described in the first aspect is provided for use as an optical fiber coating or optical fiber coloring coating.

[0068] In some possible implementations, the fiber coating is selected from at least one of fiber inner layer coating, fiber outer layer coating, fiber parallel strip coating, or fiber tight-buffer coating.

[0069] Thirdly, an optical fiber coating or optical fiber coloring coating is provided, the optical fiber coating or optical fiber coloring coating comprising the photocurable composition of the first aspect.

[0070] The present invention will be described below with reference to specific implementation schemes. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0071] In this invention, unless otherwise specified, all proportions are weight ratios and all temperatures are in degrees Celsius.

[0072] Test method: Volatile matter test method: Place the glass slide in an oven and dry for 30 minutes. Then remove it from the oven and cool it to room temperature in a desiccator. Weigh the slide and record the weight as M1. Apply the coating sample onto the glass slide to form a coating film of appropriate thickness. Weigh the total weight of the glass slide and coating, and record it as M2. Place the glass slide in a container with a high-purity quartz glass upper layer, purge with nitrogen for 1 minute to expel the air from the container, and then cure it under an ultraviolet light source. The light source energy is set to 1500 mJ / cm². 2 The conveyor belt speed was set to 17 m / min. After curing, nitrogen gas was passed through for 1 minute to remove volatile gases. The total weight of the glass slide and the cured coating was recorded as M3. At this point, the volatile matter content of the sample was equal to (M2). M3) / (M2 M1)*100%.

[0073] Curing degree test method: The surface of the sample after the above volatile matter test can be scanned with an infrared spectrometer, and the 1410 cm⁻¹ of the infrared spectrum can be selected. 1 Integrate the absorption peak, and then integrate the standard absorption peak (e.g., 1730 cm⁻¹). 1 The absorption peaks of the two absorption peaks (S1410 / S1730) are used to define the AU sample. Uncured coating samples are tested in the same way, and the integral ratio of the areas of the two absorption peaks (L1410 / L1730) is defined as the AU liquid sample. The degree of cure can be calculated using the formula: ((AU liquid) The degree of curing of the coating is calculated as (AU sample) / (AU liquid) * 100%. The degree of curing is used to characterize the curing speed; the higher the degree of curing, the faster the curing speed.

[0074] The specific selection of compounds in the embodiments of the present invention is as follows: Photocurable oligomers Oligomer 1: Polyurethane acrylate oligomer, obtained by reacting hydroxypropyl methacrylate (HPMA) directly with toluene diisocyanate (TDI).

[0075] Oligomer 2: Polyether-type polyurethane acrylate oligomer, obtained by reacting 1000 molecular weight polyether diol with diphenylmethane diisocyanate (MDI), followed by end capping with hydroxyethyl methacrylate (HEMA).

[0076] Oligomer 3: Epoxy acrylate oligomer, selected from Miki SM6104 epoxy acrylate.

[0077] Oligomer 4: Modified epoxy acrylate, obtained by reacting maleic anhydride with hydroxyethyl methacrylate (HEMA) and then reacting with bisphenol A epoxy resin.

[0078] Photoinitiator: Photoinitiator 1: A compound of formula II, wherein R1 and R2 are para-substituted methyl groups, respectively.

[0079] Photoinitiator 2:1 Hydroxycyclohexylphenyl ketone.

[0080] Photoinitiator 3: 2, 4, 6 Trimethylbenzoyl diphenoxyphosphine (TPO).

[0081] Additives: Active amine co-initiator: amine-modified acrylate, selected from Sartoma CN550.

[0082]

[0083]

[0084] Based on Example 1 in Tables 1 and 2 above 12 and Comparative Example 1 3. It can be seen that the photocurable composition containing compounds of general formula II provided by the present invention has a higher degree of curing and a lower amount of volatilization during the curing process, and has good application prospects in the optical fiber manufacturing industry.

[0085] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A photocurable composition, characterized in that, The photocurable composition comprises, by weight, 35-95% photocurable oligomer, 5-50% photocurable active monomer and 3-15% photoinitiator; The photoinitiator comprises at least a compound as shown in Formula II, and the compound shown in Formula II accounts for 2%-10% by weight of the photocurable composition. R1 and R2 may be the same or different, and each is independently selected from methyl, ethyl, propyl or isopropyl; and the substitution sites of R1 and R2 are para-substituted. The photocurable oligomer includes at least a polyether polyurethane acrylate oligomer, and the polyether polyurethane acrylate oligomer is selected from at least one of a difunctional polyether polyurethane acrylate oligomer or a trifunctional polyether polyurethane acrylate oligomer. The photocurable active monomer includes at least a monofunctional photocurable active monomer and a difunctional photocurable active monomer, wherein the weight percentage of the monofunctional photocurable active monomer is at most 36%. The monofunctional photocurable reactive monomer includes acrylic acid. 2 Phenoxyethyl ester, isobornyl acrylate, isodecyl acrylate, isooctyl acrylate, polyethylene glycol o-phenyl ether acrylate, nonylphenol polyoxyethylene ether acrylate, N Vinylcaprolactam; The bifunctional photocurable active monomer comprises 1,6 Hexanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate.

2. The photocurable composition according to claim 1, characterized in that, The photocurable oligomers also include epoxy acrylate oligomers.

3. The photocurable composition according to claim 1, characterized in that, The epoxy acrylate oligomer is one or more of the following: monofunctional epoxy acrylate oligomer, difunctional epoxy acrylate oligomer, or trifunctional epoxy acrylate oligomer.

4. The photocurable composition according to claim 1, characterized in that, The polyurethane acrylate oligomer is obtained by reacting diisocyanate with hydroxyl-containing acrylate.

5. The photocurable composition according to claim 3, characterized in that, The epoxy acrylate oligomers are obtained by reacting bisphenol A epoxy resin with a photopolymerizable compound containing carboxyl groups.

6. The photocurable composition according to claim 1, characterized in that, The photoinitiator further includes one or more of the following substances: phenylbis(2,4,6) Trimethylbenzoyl)phosphine oxide, 1 Hydroxycyclohexylphenyl ketone, 2 hydroxyl 2 methyl 1 Phenyl 1 Acetone, benzophenone, 2,2 Dimethoxy 2 phenylacetophenone, 2 hydroxyl 4' (2 Hydroxyethoxy 2 Methyl acetone, 2 Isopropylthioxanthone, 2,4 Diethylthiazolidinone.

7. The photocurable composition according to any one of claims 1-6, characterized in that, The photocurable composition further includes an additive selected from one or more of silane coupling agents, defoamers, dispersants, leveling agents, and active amine co-initiators, wherein the additive accounts for 0.01% by weight. 10% by weight.

8. The photocurable composition according to claim 1, characterized in that, The photocurable composition further includes a colorant, wherein the colorant accounts for 0.1% by weight. 8% by weight.

9. Claim 1 The photocurable composition described in any one of the 8 examples is used as an optical fiber coating or optical fiber coloring coating.

10. The application according to claim 9, characterized in that, The fiber coating is selected from at least one of the following: fiber inner layer coating, fiber outer layer coating, fiber parallel strip coating, or fiber tight-buffer coating.

11. An optical fiber coating or optical fiber coloring paint, characterized in that, The optical fiber coating or optical fiber coloring paint includes the following as claimed in claim 1 The light-curing composition as described in any one of the 8.

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