Optical material composition and preparation method therefor

Abstract

Provided is an optical material composition, comprising the following raw materials in parts by weight: component A: 3-50 parts of an inorganic compound containing a sulfur atom and / or a selenium atom; component B: 30-95 parts of a thiacyclic compound; component C: 2-30 parts of a polythiol compound; and component D: 0.005-5 parts of a compound having a structure of formula I. An optical material prepared by using the composition has a Ne of 1.73 or above and heat resistance of 90℃ or above. The compound of formula I endows the material with excellent aging resistance, solves the problem of low heat resistance caused by the addition of an inorganic compound, and enables the material to have better polymerization uniformity, no white haze, no streaks and improved yield, thus meeting application performance, involving simple operation and facilitating industralization.

Description

An optical material composition and its preparation method

[0001] This application claims priority to Chinese Patent Application No. 2024104916218, filed on April 23, 2024, entitled "An Optical Material Composition and a Method for Preparing the Same", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of materials technology, and in particular to an optical material composition and its preparation method. Background Technology

[0003] Optical materials used in eyeglass lenses possess unique properties such as low yellowness, high heat resistance, and high mechanical strength. Among these, ultra-high refractive index materials exceeding 1.70 are obtained by polymerizing sulfide-based resins through polymeric compositions containing cyclic sulfur compounds. However, further increasing the refractive index is difficult and also results in the loss of some of these excellent properties.

[0004] In recent years, a method has been proposed to incorporate inorganic sulfur compounds into polycyclic sulfur compounds to achieve high refractive indices in optical materials. However, this approach has brought about several problems, such as poor heat resistance, increased free sulfur, elongation of thioether bonds, loss of the original tightly cross-linked structure leading to poor heat resistance, incomplete dissolution and precipitation of inorganic sulfur compounds affecting the haze of the optical materials, increased viscosity due to high temperatures making casting impossible, and uneven reaction due to the presence of inorganic sulfur, resulting in material streaks, cloudiness, etc. Among these, the poor heat resistance is of paramount importance. Patents CN104080837B, CN101175792A, and CN102471442B all use monothiols or polythiols and polyisocyanates with benzene ring structures to improve the heat resistance of the materials, but the softening point is below 80℃, and the introduction of the benzene ring structure reduces the aging resistance of the materials. The CN101932630B report does not use a benzene ring structure but instead adds highly functional disulfide polythiols to improve heat resistance, with a softening point exceeding 120℃. However, the application of these disulfide polythiols introduces a large number of thioacetal structures into the cured material. These structures are unstable and prone to bond breakage at high temperatures, resulting in poorer anti-aging properties. Furthermore, to promote sulfur dissolution in the reaction system, control the reaction rate, and avoid material streaks, all the above patents use hindered amine precatalysts for prepolymerization. Since these catalysts do not participate in the reaction, they will inevitably remain free in the system, adversely affecting the material's heat resistance.

[0005] Therefore, it is essential to develop a composition with high refractive index, good aging resistance and excellent heat resistance. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide an optical material composition having high refractive index, good anti-aging properties and good heat resistance.

[0007] This invention addresses the numerous shortcomings of existing sulfur-containing optical material compositions by providing a composition and preparation method that exhibits high refractive index, good aging resistance, and excellent heat resistance. The composition comprises inorganic sulfur, cyclic sulfur compounds, polythiols, and a compound of formula 1. Optical lens materials prepared using this composition can achieve a refractive index of 1.73 or higher, making them suitable for more advanced optical lens materials; the glass transition temperature is greater than 90°C; and a stepwise polymerization process overcomes the problem of reduced heat resistance caused by the addition of inorganic compounds, improving yield while being simple to operate and easy to industrialize.

[0008] This invention provides an optical material composition comprising the following raw materials in parts by weight:

[0009] Component A: 3 to 50 parts of inorganic compounds having sulfur atoms and / or selenium atoms; Component B: 30 to 95 parts of cyclic sulfur compounds; Component C: 2 to 30 parts of polythiol compounds; Component D: 0.005 to 5 parts of compounds with the structure of Formula I.

[0010] Where X is O or S.

[0011] This invention, through in-depth research, has discovered that the compound of Formula 1 can catalyze the reaction between sulfur and cyclic sulfur compounds, exhibiting moderate reactivity and acting as a prepolymerization catalyst. Furthermore, the cyclic sulfur groups in Formula 1 participate in the polymerization reaction without remaining free within the material, thus suppressing the formation of white turbidity and preventing a decrease in the material's heat resistance. Simultaneously, the high sulfur content and high rigidity structure of Formula 1 ensure both the material's high refractive index characteristics and effectively improve its heat resistance, while avoiding the introduction of aromatic ring structures and thus not reducing the material's aging resistance.

[0012] In a preferred embodiment of the present invention, the optical material composition comprises the following raw materials in parts by weight:

[0013] Component A: 5 to 40 parts of inorganic compounds having sulfur atoms and / or selenium atoms; Component B: 40 to 90 parts of cyclic sulfur compounds; Component C: 2 to 20 parts of polythiol compounds; Component D: 0.01 to 4.5 parts of compounds with the structure of Formula I.

[0014] In a preferred embodiment of the present invention, the optical material composition comprises the following raw materials in parts by weight:

[0015] Component A: 10 to 35 parts of inorganic compounds having sulfur atoms and / or selenium atoms; Component B: 45 to 80 parts of cyclic sulfur compounds; Component C: 2 to 20 parts of polythiol compounds; Component D: 0.03 to 4.3 parts of compounds with the structure of Formula I.

[0016] In a preferred embodiment of the present invention, the optical material composition comprises the following raw materials in parts by weight:

[0017] Component A: 13 to 30 parts of inorganic compounds having sulfur atoms and / or selenium atoms; Component B: 50 to 80 parts of cyclic sulfur compounds; Component C: 2 to 15 parts of polythiol compounds; Component D: 0.1 to 4.0 parts of compounds with the structure of Formula I.

[0018] In a preferred embodiment of the present invention, the optical material composition comprises the following raw materials in parts by weight:

[0019] Component A: 15 to 25 parts of inorganic compounds having sulfur atoms and / or selenium atoms; Component B: 55 to 80 parts of cyclic sulfur compounds; Component C: 2 to 10 parts of polythiol compounds; Component D: 0.5 to 4.0 parts of compounds with the structure of Formula I.

[0020] In a preferred embodiment of the present invention, component A is sulfur;

[0021] Component B is a bis(β-cyclothiopropyl) sulfide and / or a bis(β-cyclothiopropyl) disulfide. The source of this component is not limited; commercially available components are acceptable.

[0022] According to the present invention, the polythiol compound is selected from one of the following: bis(2-mercaptoethyl) sulfide, 1,4-dithiazide-2,5-dimethylthiol, pentaerythritol tetra(2-mercaptoacetate), pentaerythritol tetra(3-mercaptopropionate), 2,5-bis(mercaptomethyl)-1,4-dithiazide, 1,2-bis(2-mercaptoethylthio)-3-mercaptopropane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and bis(4-mercaptomethylphenyl) sulfide. Or several; more preferably, the polythiol compound is selected from one or more of bis(2-mercaptoethyl) sulfide, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 1,2-bis(2-mercaptoethylthio)-3-mercaptopropane, 1,4-dithiazide-2,5-dimethylthiol, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane; most preferably, the polythiol compound is selected from 1,2-bis(2-mercaptoethylthio)-3-mercaptopropane, 1,4-dithiazide-2,5-dimethylthiol, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane.

[0023] According to the present invention, the compound of formula I is preferably...

[0024] DS:

[0025] The inventors discovered that while component B, a cyclic sulfur compound, has a relatively high sulfur content, the addition of inorganic sulfur compound A imparts ultra-high refractive index to the material but reduces its heat resistance. Compound of Formula 1 can catalyze the reaction between sulfur and the cyclic sulfur compound, exhibiting moderate reactivity and acting as a prepolymerization catalyst. Furthermore, compound of Formula 1 contains cyclic sulfur groups that can participate in the polymerization reaction without remaining free within the material, thus suppressing the formation of white turbidity and preventing a decrease in the material's heat resistance.

[0026] The high sulfur content and high rigidity of the compound in Formula 1 ensure both the high refractive index and effectively improve the heat resistance of the material, while avoiding the introduction of aromatic ring structures and thus not reducing the material's aging resistance. The introduction of Formula 1 can improve aging resistance and glass transition temperature, meeting the performance requirements for product applications and facilitating industrial production. With a Tg above 90℃, a high-heat-resistant optical material is ultimately obtained, filling the gap in the field of high-refractive-index optical materials with new advantages in low heat resistance. Using the above combination, a material that balances both properties can be obtained.

[0027] The optical resin material described in this invention has a refractive index ≥ 1.73 and a glass transition temperature Tg ≥ 90℃.

[0028] This invention provides a method for preparing the optical material composition according to any one of the above technical solutions, comprising the following steps:

[0029] S1) Components A, B, and D are polymerized to obtain a polymer;

[0030] S2) Mix the polymer, UV absorber, release agent, colorant, initiator, and component C, stir, degas, pour, cure, and demold to obtain the final product.

[0031] The method for preparing the optical material composition provided by this invention first polymerizes components A, B, and D to obtain a polymer. The polymerization temperature is 20–80°C, preferably 50–70°C, and the polymerization time is 20–200 min; preferably 60–120°C / min.

[0032] The above methods allow for mixing all ingredients in the same container, adding each ingredient in stages, or mixing the ingredients in different containers first, and then adding each ingredient in stages. The mixing order is arbitrary.

[0033] The polymer is obtained by polymerization. When the temperature of the polymer is lowered to 20-30℃, no sulfur is precipitated, and the refractive index of the liquid is ≥1.675.

[0034] Mix the polymer, UV absorber, release agent, colorant, initiator, and component C, and stir.

[0035] The stirring temperature is 5–30°C;

[0036] The initiator of this invention is selected from one or more of dimethyltin dichloride, diethyltin dichloride, tert-butyltin trichloride, dibutyltin dichloride, tetrabutylammonium bromide, tetrabutylphosphonium bromide, or triphenylphosphine.

[0037] In the specific preparation of optical material products, other additives such as blue or red agents can be added as needed. The inventors provide examples as follows:

[0038] The raw materials may also include:

[0039] The ultraviolet absorber is selected from one or more of UV-326, UV-327, UV-329, and UV-541, with UV-329 being more preferred;

[0040] The phosphate release agent is selected from one or more of dibutyl phosphate and polyoxyethylene ether phosphate;

[0041] The colorant is a blue agent and a red agent; the concentration of the blue agent is 3 ppm to 3.5 ppm; and the concentration of the red agent is 1 ppm to 2 ppm.

[0042] The above components can be added in appropriate amounts according to the performance requirements of the optical materials, which the inventor will not elaborate on further.

[0043] A polytetrafluoroethylene (PTFE) filter membrane, commonly used in this field, is used for filtration and casting. The cast sample is then cured. The curing process includes primary curing and secondary curing.

[0044] Specifically, the heating procedure for the first curing step is as follows: the initial temperature is 20℃, the temperature is maintained for 2.5h to 5.5h, the temperature is increased to 35℃ to 45℃ after 3h to 55h, then the temperature is increased to 55℃ to 65℃ after 7h to 10h, the temperature is increased to 75℃ to 105℃ after 2.5h to 3.5h, and finally the temperature is decreased to 65℃ to 75℃ after 1.5h to 2.5h.

[0045] The heating process for the secondary curing is as follows: maintain the temperature at 100-120℃ for 2-4 hours, and then cool down to 65-75℃ for the last 1.5-2.5 hours.

[0046] This invention provides an optical material product, the raw materials of which include the optical material composition described in any one of the above technical solutions.

[0047] The optical products described in this invention include, but are not limited to, optical lenses and optical components. The optical material products possess high refractive index, anti-aging properties, and high heat resistance.

[0048] Testing showed that the refractive index of the optical material obtained by the above preparation method can reach more than 1.74, making it suitable for higher-end optical materials; the glass transition temperature is greater than 90℃, the yield is high, the chromaticity value is low, and the operation is simple and easy to industrialize.

[0049] This invention provides an optical material composition comprising the following raw materials in parts by weight: Component A: 3 to 50 parts of an inorganic compound having sulfur and / or selenium atoms; Component B: 30 to 95 parts of a cyclic sulfur compound; Component C: 2 to 30 parts of a polythiol compound; Component D: 0.005 to 5 parts of a compound of Formula I. Optical materials prepared using this composition have a Ne value of 1.73 or higher and a heat resistance of 90°C or higher. The compound of Formula I not only provides excellent anti-aging properties but also overcomes the problem of low heat resistance caused by the addition of inorganic compounds. Furthermore, it makes the polymerization of the material more uniform, without whitening or material streaks, improving the yield, meeting application performance requirements, and is simple to operate and easy to industrialize. Detailed Implementation

[0050] This invention provides an optical material composition and its preparation method. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the desired result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and fall within the scope of protection of this invention. The method and application of this invention have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the method and application described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0051] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.

[0052] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items.

[0053] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0054] The numerical ranges and parameters involved in this invention have been presented as accurately as possible to the relevant values ​​in the specific embodiments. However, any numerical value inevitably contains standard deviations due to individual test methods. Therefore, unless otherwise expressly stated, it should be understood that all numerical ranges or specific data used in this disclosure may have a reasonable deviation within a certain range, for example, within 1% or 0.5%.

[0055] The embodiments and comparative examples of this invention describe some examples, in which the embodiments illustrate certain implementations of the invention. However, this does not mean that the effects of the invention can only be achieved in these examples.

[0056] A: Sulfur, B-1: Bis(β-cyclothiopropyl) sulfide, B-2: Bis(β-cyclothiopropyl) disulfide, C-1: 1,2-bis(2-mercaptoethylthio)-3-mercaptopropane, C-2: 1,4-dithiaran-2,5-dimethylthiol, C-3: 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, C-4: 1,4-benzenedithiol

[0057] DO: DS:

[0058] The detection method is as follows:

[0059] Anti-aging performance: The lens was placed at 80℃ for 240 hours for a long-term hot air aging test. The anti-aging performance was evaluated using the yellow index.

[0060] Yellow Index (YI): Spectrophotometer, Hunter Prolab, C / 2 light source;

[0061] Glass transition temperature (Tg): DSC-Ⅱ differential scanning calorimeter, heating rate 10K / min;

[0062] Refractive index (Ne): Abbe refractometer.

[0063] Lens texture and cloudiness: Prepare 100 lenses for each formula. 1-5 lenses with or without lens texture and cloudiness are classified as Formula A. 6-10 lenses with or without lens texture and cloudiness are classified as Formula B. More than 10 lenses with lens texture and cloudiness are classified as Formula C.

[0064] To further illustrate the present invention, the following describes in detail an optical material composition and its preparation method provided by the present invention with reference to embodiments.

[0065] Example 1

[0066] At 60℃, 75g of component B-1, 18g of sulfur, and 3g of D-O were polymerized until the sulfur was completely dissolved. The solution temperature dropped to 20℃, no sulfur precipitation occurred, and the liquid refractive index was greater than 1.675, yielding polymer solution A. The following substances were added sequentially: 2g of C-1, 2g of C-2, 0.005g of tetrabutylphosphine bromide, 0.08g of UV329, 0.005g of di-n-butyl phosphate, and 0.16g of blue. The mixture was then vacuum-stirred and degassed for 30 minutes. The solution was filtered through a 10μm PTFE membrane and injected into a mold. The mold was then placed in a programmed temperature curing oven for curing to obtain a high-refractive-index, high-heat-resistant optical material. Its refractive index is 1.7451, and its glass transition temperature (Tg) is 95℃.

[0067] The temperature program of the programmed curing oven is as follows: the initial curing temperature is 20℃, held for 2.5 hours, then increased to 35℃ after 2.5 hours, then successively increased to 50℃ for 8 hours, to 85℃ for 3.5 hours, and finally decreased to 70℃ for 1.5 hours. After mold opening, the second curing program is performed, held at 120℃ for 2 hours, and finally decreased to 70℃ for 1.5 hours.

[0068] After aging, the yellow index is 3.59, and 2 out of 100 pieces have a cloudy white residue, which is grade A.

[0069] Example 2

[0070] a) At 60℃, 78g of component B-1, 18g of sulfur, 0.5g of D-O, and 0.5g of DS were polymerized until the sulfur was completely dissolved, the liquid temperature dropped to 20℃, no sulfur precipitation occurred, and the liquid refractive index was 1.6768, yielding polymer solution A. The following substances were added sequentially: 3g of C-3, 0.005g of dibutyltin dichloride, 0.005g of tetrabutylphosphine bromide, 0.08g of UV329, 0.005g of di-n-butyl phosphate, and 0.16g of blue. The mixture was vacuum stirred and degassed for 30min. The solution was then filtered through a 10μm PTFE membrane and injected into a mold. The mold was then placed in a programmed temperature curing oven for curing to obtain a high-refractive-index, high-heat-resistant optical material. Its refractive index is 1.7459, and its glass transition temperature (Tg) is 90℃.

[0071] After aging, the yellow index is 4.55, and 1 out of 100 pieces has a cloudy white residue, which is grade A.

[0072] Example 3

[0073] At 60℃, 71g of component B-1, 25g of sulfur, and 2g of DS were polymerized until the sulfur was completely dissolved. The solution temperature dropped to 20℃, no sulfur precipitation occurred, and the liquid refractive index was 1.6753, yielding polymer solution A. The following substances were added sequentially: 2g of C-1, 0.005g of dibutyltin dichloride, 0.005g of tetrabutylphosphine bromide, 0.08g of UV329, 0.005g of di-n-butyl phosphate, and 0.16g of blue. The mixture was then vacuum-stirred and degassed for 30 minutes. The solution was filtered through a 10μm PTFE membrane and injected into a mold. The mold was then placed in a programmed temperature curing oven for curing to obtain a high-refractive-index, high-heat-resistant optical material. Its refractive index is 1.7486, and its glass transition temperature (Tg) is 93℃.

[0074] After aging, the yellow index is 3.85, and 3 out of 100 pieces have a cloudy white residue, which is grade A.

[0075] Example 4

[0076] At 60℃, 78g of component B-1, 15g of sulfur, and 4g of DO were polymerized until the sulfur was completely dissolved. The solution temperature dropped to 20℃, no sulfur precipitation occurred, and the liquid refractive index was 1.6761, yielding polymer solution A. The following substances were added sequentially: 2g of C-1, 1g of C-3, 0.005g of dibutyltin dichloride, 0.005g of tetrabutylphosphine bromide, 0.08g of UV329, 0.005g of di-n-butyl phosphate, and 0.16g of blue. The mixture was then vacuum-stirred and degassed for 30 minutes. The solution was filtered through a 10μm PTFE membrane and injected into a mold. The mold was then placed in a programmed temperature curing oven for curing to obtain a high-refractive-index, high-heat-resistant optical material. Its refractive index is 1.7355, and its glass transition temperature (Tg) is 94℃.

[0077] After aging, the yellow index was 3.69, and 3 out of 100 pieces showed white turbidity with material marks, which is grade A.

[0078] Example 5

[0079] At 60℃, 80g of component B-1, 15g of sulfur, and 3g of DO were polymerized until the sulfur was completely dissolved. The solution temperature dropped to 20℃, no sulfur precipitation occurred, and the liquid refractive index was 1.6786, yielding polymer solution A. The following substances were added sequentially: 2g of C-2, 0.005g of dibutyltin dichloride, 0.005g of tetrabutylphosphine bromide, 0.08g of UV329, 0.005g of di-n-butyl phosphate, and 0.16g of blue. The mixture was then vacuum-stirred and degassed for 30 minutes. The solution was filtered through a 10μm PTFE membrane and injected into a mold. The mold was then placed in a programmed temperature curing oven for curing to obtain a high-refractive-index, high-heat-resistant optical material. Its refractive index is 1.7488, and its glass transition temperature (Tg) is 97℃.

[0080] After aging, the yellow index was 4.09, and 2 out of 100 pieces showed white turbidity with material marks, which is grade A.

[0081] Comparative Example 1

[0082] At 60℃, 75g of component B-1 and 20g of sulfur were polymerized until the sulfur was completely dissolved. The solution temperature dropped to 20℃, with no sulfur precipitation and a refractive index of 1.6758, yielding polymer solution A. The following substances were added sequentially: 5g C-1, 0.005g dibutyltin dichloride, 0.005g tetrabutylphosphine bromide, 0.08g UV329, 0.005g di-n-butyl phosphate, and 0.16g blue. The mixture was then vacuum-stirred and degassed for 30 minutes. The solution was filtered through a 10μm PTFE membrane and injected into a mold. The mold was then placed in a programmed temperature curing oven for curing to obtain a high-refractive-index, high-heat-resistant optical material. Its refractive index is 1.7286, and its glass transition temperature (Tg) is 75℃.

[0083] After aging, the yellow index was 15.69, and 15 out of 100 pieces showed cloudy white material with visible marks, classifying them as Grade C.

[0084] Comparative Example 2

[0085] At 60℃, 80g of component B-1 and 18g of sulfur were polymerized until the sulfur was completely dissolved. The solution temperature dropped to 20℃, no sulfur precipitation occurred, and the refractive index of the liquid was 1.6765, yielding polymer solution A. The following substances were added sequentially: 2g C-2, 0.005g dibutyltin dichloride, 0.005g tetrabutylphosphine bromide, 0.08g UV329, 0.005g di-n-butyl phosphate, and 0.16g blue. The mixture was then vacuum-stirred and degassed for 30 minutes. The solution was filtered through a 10μm PTFE membrane and injected into a mold. The mold was then placed in a programmed temperature curing oven for curing to obtain a high-refractive-index, high-heat-resistant optical material. Its refractive index is 1.7257, and its glass transition temperature (Tg) is 80℃.

[0086] After aging, the yellow index was 20.90, and 25 out of 100 pieces showed white turbidity with material marks, which is grade C.

[0087] Comparative Example 3

[0088] Polymerization was carried out at 60℃ with 75g of component B-1, 20g of sulfur, and 0.02g of 2-mercaptoimidazole until the sulfur was completely dissolved. The solution temperature dropped to 20℃, no sulfur precipitation occurred, and the liquid refractive index was 1.6765, yielding polymer solution A. The following substances were added sequentially: 2g C-2, 0.005g dibutyltin dichloride, 0.005g tetrabutylphosphine bromide, 0.08g UV329, 0.005g di-n-butyl phosphate, and 0.16g blue. The mixture was then vacuum-stirred and degassed for 30 minutes. The solution was filtered through a 10μm PTFE membrane and injected into a mold. The mold was then placed in a programmed temperature curing oven for curing to obtain a high-refractive-index, high-heat-resistant optical material. Its refractive index is 1.7356, and its glass transition temperature (Tg) is 68℃.

[0089] After aging, the yellow index was 31.85, and 15 out of 100 pieces showed cloudy white material with visible marks, classifying them as Grade C.

[0090] Comparative Example 4

[0091] At 60℃, 80g of component B-1, 18g of sulfur, and 0.02g of 2-mercaptoimidazole were polymerized until the sulfur was completely dissolved. The solution temperature dropped to 20℃, no sulfur precipitation occurred, and the liquid refractive index was 1.6765, yielding polymer solution A. The following substances were added sequentially: 2g of C-2, 0.005g of dibutyltin dichloride, 0.005g of tetrabutylphosphine bromide, 0.08g of UV329, 0.005g of di-n-butyl phosphate, and 0.16g of blue. The mixture was then vacuum-stirred and degassed for 30 minutes. The solution was filtered through a 10μm PTFE membrane and injected into a mold. The mold was then placed in a programmed temperature curing oven for curing to obtain a high-refractive-index, high-heat-resistant optical material. Its refractive index is 1.7301, and its glass transition temperature (Tg) is 80℃.

[0092] After aging, the yellow index was 21.62, and 20 out of 100 pieces showed white turbidity with material marks, classifying it as Grade C.

[0093] Table 1

[0094] As shown in the table, the optical materials provided in Examples 1-5 of this invention exhibit excellent anti-aging properties and heat resistance—the yellowing index and Tg after aging are significantly superior to those in Comparative Examples 1-4. The higher glass transition temperature expands the material's application range, significantly extends its service life, increases yield, and further improves its cost-effectiveness. Simultaneously, the unit cost of the entire processing is reduced, thereby increasing enterprise profits and facilitating industrial production. Furthermore, the product components themselves contain no unstable groups that cause yellowing, resulting in stable performance after curing and a better user experience, representing a significant improvement over existing technologies.

Claims

1. An optical material composition, characterized in that, The ingredients include the following parts by weight: Component A: 3 to 50 parts of inorganic compounds having sulfur atoms and / or selenium atoms; Component B: 30 to 95 parts of cyclic sulfur compounds; Component C: 2 to 30 parts of polythiol compounds; Component D: 0.005 to 5 parts of compounds with the structure of Formula I. Where X is O or S.

2. The optical material composition according to claim 1, characterized in that, Component A is sulfur; Component B is a bis(β-cyclothiopropyl) sulfide and / or a bis(β-cyclothiopropyl) disulfide.

3. The optical material composition according to claim 1, characterized in that, The polythiol compound is selected from one or more of the following: bis(2-mercaptoethyl) sulfide, pentaerythritol tetra(2-mercaptoacetate), pentaerythritol tetra(3-mercaptopropionate), 2,5-bis(mercaptomethyl)-1,4-dithiaane, 1,2-bis(2-mercaptoethylthio)-3-mercaptopropane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and bis(4-mercaptomethylphenyl) sulfide.

4. The optical material composition according to claim 1, characterized in that, The compound with the structure of Formula I is 5. A method for preparing the optical material composition according to any one of claims 1 to 4, characterized in that, Includes the following steps: S1) Components A, B, and D are polymerized to obtain a polymer; S2) Mix the polymer, UV absorber, release agent, colorant, initiator, and component C, stir, degas, pour, cure, and demold to obtain the final product.

6. The preparation method according to claim 5, characterized in that, In step A), the polymerization temperature is 20–80°C and the time is 20–200 min.

7. The preparation method according to claim 5, characterized in that, The stirring temperature in step B) is 5–30°C.

8. The preparation method according to claim 5, characterized in that, The The initiator is selected from one or more of dimethyltin dichloride, diethyltin dichloride, tert-butyltin trichloride, dibutyltin dichloride, tetrabutylammonium bromide, tetrabutylphosphonium bromide, or triphenylphosphine; The ultraviolet absorber is selected from one or more of UV-326, UV-327, UV-329, or UV-541; The release agent is selected from one or more of dibutyl phosphate or polyoxyethylene ether phosphate; The colorant is a blue agent and a red agent; the concentration of the blue agent is 3 ppm to 3.5 ppm; and the concentration of the red agent is 1 ppm to 2 ppm.

9. The preparation method according to claim 5, characterized in that, The curing process includes primary curing and secondary curing. The heating procedure for the first curing step is as follows: the initial temperature is 20℃, the temperature is maintained for 2.5h to 5.5h, the temperature is increased to 35℃ to 45℃ after 3 to 5h, then the temperature is increased to 55℃ to 65℃ after 7h to 10h, the temperature is increased to 75℃ to 105℃ after 2.5h to 3.5h, and finally the temperature is decreased to 65℃ to 75℃ after 1.5h to 2.5h. The heating process for the secondary curing is as follows: maintain the temperature at 100-120℃ for 2-4 hours, and then cool down to 65-75℃ for the last 1.5-2.5 hours.

10. An optical material product, characterized in that, The raw materials include the optical material composition according to any one of claims 1 to 4.

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