Polycyclic sulfur compounds, methods for their preparation and use

Abstract

The application discloses a kind of polycyclic sulfur compounds and its preparation method and application, for the brittle big, impact resistance insufficient problem existing in the high refractive index optical resin prepared by existing ring sulfur compound, the application provides 1,3,5-benzene tricyclic sulfur propyl sulfide (formula I) and 1,2,4,5-benzene tetracyclic sulfur propyl sulfide (formula II) two new polycyclic sulfur compounds.The compound is rigid benzene ring as core, connect specific number of ring sulfur propyl branch by sulfide bond, produce the synergistic effect by unique molecular design, solve the contradiction that high refractive index and high toughness are difficult to take into account.Its preparation method includes under certain conditions, 1,3,5-benzene trithiol or 1,2,4,5-tetramercaptobenzene is reacted with cyclo-sulfur chloropropane, and is obtained by extraction etc..The refractive index of optical lens prepared from the compound is as high as 1.745-1.771, and excellent impact resistance is shown, and the comprehensive performance is significantly better than traditional bicyclic sulfur compound system.

Description

Technical Field

[0001] This invention relates to the field of optical materials technology, and in particular to a polycyclic sulfur compound, its preparation method, and its application. Background Technology

[0002] With the rapid development of modern optical devices towards lightweight and thin designs, organic polymer materials, due to their significant advantages such as light weight, resistance to breakage, and ease of processing, have gradually replaced traditional inorganic glass materials and become the mainstream choice for optical lens manufacturing. Especially in fields such as spectacle lenses and camera lenses, high-refractive-index optical resins can achieve lighter and thinner optical designs by reducing the center thickness and curvature of the lens, demonstrating significant application value. Currently, high-refractive-index optical resins with a refractive index higher than 1.70 have become a key research focus in the industry. Among numerous technical approaches, material systems characterized by the introduction of sulfur atoms stand out. Cyclic sulfur compounds and multi-thiol systems, due to the presence of highly polarizable sulfur atoms in their molecules, can significantly increase the refractive index of the material, becoming the main technical means to achieve high-refractive-index optical resins.

[0003] In the cyclic sulfur compound system, cyclic sulfur monomers such as bis(2,3-cyclothiopropyl) disulfide and bis(2,3-cyclothiopropyl) sulfide are the most widely studied. Through copolymerization with polythiol monomers, optical materials with refractive indices of 1.68-1.72 can be prepared. However, in practical applications, these materials have revealed a long-standing technical contradiction: it is difficult to achieve both high refractive index and high toughness. It is well known to those skilled in the art that in order to improve the refractive index, it is usually necessary to increase the sulfur atom content in the molecule (such as increasing the cyclic sulfur functionality) or introduce rigid structures (such as aromatic rings). However, this technical approach has inherent defects: (1) the increase in the number of cyclic sulfur groups will lead to excessively high crosslinking density, which will restrict the mobility of molecular chain segments and significantly increase the brittleness of the material; (2) although the introduction of rigid structures can improve hardness and heat resistance, it will further weaken the toughness of the material; (3) this "inverse relationship" between refractive index and toughness has become a key technical bottleneck restricting the development of high refractive index optical resins.

[0004] To address these contradictions, researchers have explored various methods: balancing performance by adjusting the ratio of cyclic sulfur compounds to polythiols; introducing flexible segments to improve toughness; and optimizing polymerization conditions to control crosslinking density. However, these methods have limited effectiveness, often sacrificing refractive index to improve toughness, or failing to fundamentally solve the material's brittleness problem. Particularly when a refractive index of 1.74 or higher is required, materials prepared using existing techniques generally suffer from insufficient impact resistance and struggle to pass rigorous drop ball tests (such as FDA standard tests).

[0005] Therefore, in order to resolve the irreconcilable contradiction between high refractive index and high toughness in existing technologies, it is necessary to develop a new compound for preparing optical materials. Summary of the Invention

[0006] The purpose of this invention is to provide a method for preparing and applying a polycyclic sulfur compound. This polycyclic sulfur compound features a novel compound structure in which a rigid benzene ring core is connected to a specific number of cyclothiopropyl groups via thioether bonds. This unique structural design provides a new technical approach to resolving the contradiction between refractive index and toughness. Compared with traditional bicyclic sulfur compounds, this invention not only significantly improves the refractive index but also unexpectedly enhances the material's impact resistance, achieving a significant technological breakthrough.

[0007] To achieve the aforementioned objective, the present invention adopts the following technical solution: In a first aspect of the invention, a polycyclic sulfur compound is provided, the polycyclic sulfur compound comprising: 1,3,5-Benzenetricyclic thiopropyl sulfide, with the chemical structure shown in Formula I; Alternatively, 1,2,4,5-phenyltetracyclic thiopropyl sulfide, with the chemical structure shown in Formula II; ,

[0008] In a second aspect of the invention, a method for preparing the aforementioned polycyclic sulfur compound is provided, the method comprising: Step S1: Under an inert atmosphere, 1,3,5-benzenetrithiophenol or 1,2,4,5-tetramercaptobenzene is reacted with cyclothiochloropropane in an organic solvent and under alkaline conditions, respectively, with the addition of a catalyst to obtain the reactants. Step S2: Add an inorganic alkaline aqueous solution to the reactants. After the reaction is complete, extract, wash with water, dry, and remove the solvent under reduced pressure.

[0009] Furthermore, in step S1, the reaction temperature is controlled between -10°C and -5°C.

[0010] Furthermore, in step S2, the dropping rate of the inorganic alkaline aqueous solution is 3-5 ml / min.

[0011] Furthermore, the organic solvent is selected from at least one of acetone, butanone, and cyclohexanone.

[0012] Furthermore, the alkaline conditions are provided by an aqueous solution of an inorganic base, wherein the inorganic base is selected from at least one of the following: Sodium hydroxide, potassium hydroxide, sodium carbonate, or sodium bicarbonate, in an aqueous solution with a concentration of 20%-30%.

[0013] Furthermore, the catalyst is selected from tetrabutylammonium bromide or hexadecyltrimethylammonium bromide, and the mass of the catalyst used is 0.1%-0.5% of the total mass of the reactants.

[0014] Further, the molar ratio of 1,3,5-benzenetrithiophenol to cyclothiochloropropane is 1:3-1:12; the molar ratio of 1,2,4,5-tetramercaptobenzene to cyclothiochloropropane is 1:4.4-1:32.

[0015] In a third aspect of the invention, an optical material is provided comprising the aforementioned polycyclic sulfur compound as a monomer component.

[0016] Furthermore, the refractive index of the optical material is not less than 1.74, and no cracks are found in the drop ball test (16mm / 16g steel ball, 1.27m height).

[0017] In a fourth aspect of the present invention, an optical lens is provided, the method for manufacturing the optical lens comprising: The polycyclic sulfur compound is mixed with diisocyanate, polythiol compound, catalyst and antioxidant to form a lens liquid; wherein the polycyclic sulfur compound, diisocyanate and polythiol compound comprise by weight parts of: 100 parts polycyclic sulfur compound; 11.4-20.5 parts diisocyanate; 16.4-22.8 parts polythiol compound; The lens liquid is vacuum degassed and filtered before being injected into a mold, followed by curing to obtain the optical lens.

[0018] This invention relates to medical device research technology, and one or more technical solutions provided therein have at least the following technical effects or advantages: This invention, through a unique molecular structure design, successfully resolves the long-standing technical contradiction in the field of high-refractive-index optical materials—the difficulty of simultaneously achieving high refractive index and high toughness. Compared to traditional cyclic sulfide compound systems, this invention not only achieves a significant improvement in refractive index but also substantially enhances the material's impact resistance while maintaining a high refractive index, representing a major technological breakthrough, as detailed below: (1) Breakthrough Improvement in Refractive Index Performance: The optical materials prepared from polycyclic sulfur compounds provided in this invention achieve an excellent refractive index of 1.745-1.771, significantly higher than that of traditional bicyclic sulfur compound systems (which typically have a refractive index of 1.68-1.72). This breakthrough makes it possible to prepare thinner and lighter high-performance optical lenses. Specific experimental data show that the refractive index of lenses prepared using 1,3,5-phenyltricyclic thiopropyl sulfide reaches 1.745-1.748; the refractive index of lenses prepared using 1,2,4,5-phenyltetracyclic thiopropyl sulfide is further improved to 1.765-1.771.

[0019] (2) Excellent toughness performance: The most groundbreaking effect of this invention, demonstrated through rigorous impact testing, is the significant improvement in toughness. Through FDA drop ball performance testing (16mm / 16g steel ball, 1.27m height), all lenses prepared in the embodiments showed no cracks, while lenses prepared using conventional bicyclic sulfur compounds in the comparative embodiments all showed cracks. This result proves that this invention successfully overcomes the brittleness problem typically associated with high-functionality cyclic sulfur compounds, achieving a perfect balance between high refractive index and high toughness.

[0020] (3) The core of the technical effect of the present invention lies in the synergistic effect produced by its unique molecular structure design: In the molecular structure shown in Formula I and Formula II, the unique design of the rigid benzene ring core and a specific number (3 or 4) of cyclothiopropyl groups connected by thioether bonds produces unexpected technical effects: the rigid benzene ring effectively ensures the hardness and heat resistance of the material; while providing a high refractive index, the specific spatial arrangement of the multiple cyclothiopropyl groups and the flexibility of the thioether bonds just avoid the brittleness caused by excessive crosslinking density; the trifunctional or tetrafunctional design, under the premise of ensuring a high refractive index, avoids material embrittlement through optimized topology. Attached Figure Description

[0021] Figure 1 Formula I is the preparation equation for cyclic sulfur compound I in Examples 1-2 of this invention.

[0022] Figure 2 Formula II is the preparation equation for cyclic sulfur compound II in Examples 3-4 of this invention.

[0023] Figure 3 The infrared spectrum of cyclic sulfur compound I in Example 1 of this invention is shown.

[0024] Figure 4 This is the 1H NMR spectrum of cyclic sulfur compound I in Example 1 of the present invention.

[0025] Figure 5 The infrared spectrum of cyclic sulfur compound II in Example 3 of this invention is shown.

[0026] Figure 6 This is the 1H NMR spectrum of cyclic sulfur compound II in Example 3 of the present invention. Detailed Implementation

[0027] The following detailed description of the embodiments and examples will illustrate the present invention in more detail, thereby making the advantages and various effects of the embodiments more clearly apparent. Those skilled in the art should understand that these detailed embodiments and examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0028] Throughout this specification, unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this invention pertain. In the event of any conflict, this specification shall prevail.

[0029] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in the embodiments of the present invention can be obtained by purchasing them on the market or by existing methods.

[0030] 1. To solve the technical problem of this invention, the overall concept of this invention is as follows: (1) Precise design of compound structure clearly defines the specific structural features of polycyclic sulfur compounds, including key parameters such as the substitution position of benzene ring, the number of cyclic sulfur groups and the connection mode, to ensure the repeatability of molecular structure and consistency of effect.

[0031] (2) Fine control of the synthesis process: By optimizing reaction conditions (such as temperature control at -10℃ to -5℃), raw material ratio (a clear molar ratio range) and process parameters (dropping speed 3-5 ml / min), the high purity (HPLC purity 89%-95.7%) and high yield (70%-88%) of the target compound are ensured.

[0032] 2. The core idea of ​​this invention is reflected in the innovations at the following three levels: (1) The precise balance between rigid core and flexible chain: By using a rigid benzene ring as the molecular core and connecting cyclothiopropyl branches at specific positions (1,3,5 or 1,2,4,5) on the benzene ring, the optimal ratio of molecular rigidity and flexibility is achieved. This design allows the material to maintain high hardness while maintaining the necessary toughness through the moderate flexibility of the thioether bond.

[0033] (2) Unlike traditional bifunctional cyclic sulfide compounds, this invention adopts a trifunctional or tetrafunctional design. However, through the rigid support of the benzene ring and the reasonable spatial arrangement of the cyclic sulfide groups, the brittleness problem caused by excessive crosslinking density is avoided. This design concept of "high functionality but not high brittleness" is the key innovation of this invention.

[0034] (3) Maximizing the synergistic effect The most groundbreaking idea of ​​this invention lies in recognizing that the combination of a rigid benzene ring and a polycyclic sulfur group is not a simple superposition of properties, but rather produces a synergistic effect of "1+1>2". This effect is manifested in: The rigidity of the benzene ring not only provides hardness but also optimizes the crosslinked network topology; Multiple cyclic sulfide groups increase the refractive index, while their specific spatial arrangement avoids excessive rigidity of the molecular chain. According to conventional understanding in this field, simultaneously increasing the cyclic sulfur functionality and introducing a rigid benzene ring structure should theoretically lead to a further increase in the material's brittleness. However, the experimental results were completely unexpected: the synergistic effect of "1+1>2" was verified. Increasing functionality alone leads to increased brittleness (as confirmed by Comparative Examples 1 and 2). Introducing a rigid structure alone will reduce toughness (a well-known fact in the industry). However, combining a specific number of cyclic sulfide groups with a rigid benzene ring in the manner described in this invention produces a synergistic enhancement effect. This technological effect, which breaks through conventional understanding, fully demonstrates the non-obviousness and inventiveness of the present invention.

[0035] 4. In addition to improving refractive index and toughness, this invention also achieves the following comprehensive performance improvements: Color performance improved: Yellowness index (YI) remained at a low level of 4.10-4.25, which was better than the comparative example; Excellent processing performance: The synthesized cyclic sulfur compounds have a purity of up to 89%-95.7%, which facilitates industrial production; Wide applicability: Can be used in combination with a variety of diisocyanates and polythiols, offering high formulation flexibility.

[0036] 5. The technical solution provided by this invention not only has excellent performance in the laboratory stage, but also has important industrial application value: the raw materials are readily available, the synthesis process is mature and reliable, the reaction conditions are mild and easy to control, the product has high purity and stable quality, and it is applicable to existing optical lens production processes without the need for special equipment modification.

[0037] The following will provide a detailed description of a polycyclic sulfur compound and its preparation method, in conjunction with examples and experimental data.

[0038] Preparation of Compound I In a four-necked flask under nitrogen protection, 87.15 g (0.5 mol) of 1,3,5-benzenetrithiophenol, 230 ml of acetone, 80 ml of methanol, 0.45 g of tetrabutylammonium bromide, and 138.75 g (1.5 mol) of cyclothiochloropropane were stirred at room temperature to form a homogeneous liquid. The temperature was controlled at -5°C, and 200 g of 20% sodium hydroxide aqueous solution was added to the reaction flask at a rate of 3 ml / min. After the addition was completed, the reaction was continued for 1.5 hours. The reaction liquid was added to a separatory funnel, and 450 ml of toluene was added for extraction. The aqueous layer was separated, and the organic layer was washed five times with deionized water, each time with 350 ml of deionized water. The organic layer was dried with anhydrous magnesium sulfate for 24 hours, filtered, and the organic solvent was removed at 85°C under negative pressure to obtain the target product. Yield: 72%, HPLC purity: 94.8%.

[0039] Infrared spectral data: 546.2 cm⁻¹-1 626.3 cm -1 683.6 cm -1 810.9 cm -1 864.4 cm -1 925.7 cm -1 1038.1 cm -1 1120.9 cm -1 1378.9 cm -1 1463.7 cm -1 1587.1 cm -1 1633.9 cm -1 1762.6 cm -1 1901.4 cm -1 2550.4 cm -1 2855.1 cm -1 2913.9 cm -1 3463.5cm -1 .

[0040] 1H NMR data: 2.50 ppm, 2.59 ppm, 2.67 ppm, 2.71 ppm, 2.83 ppm, 2.92 ppm, 3.52 ppm, 5.74 ppm.

[0041] Example 2: Preparation of cyclic sulfur compound I In a four-necked flask under nitrogen protection, 87.15 g (0.5 mol) of 1,3,5-benzenetrithiophenol, 180 ml of butanone, 120 ml of methanol, 0.26 g of hexadecyltrimethylammonium bromide, and 1110 g (12 mol) of cyclothiochloropropane were stirred at room temperature to form a homogeneous liquid. The temperature was controlled at -10°C, and 300 g of 20% sodium carbonate aqueous solution was added to the reaction flask at a rate of 5 ml / min. After the addition was completed, the reaction was continued for 1.5 hours. The reaction liquid was added to a separatory funnel, and 500 ml of butyl acetate was added for extraction. The aqueous layer was separated, and the butyl acetate layer was washed five times with deionized water, each time with 600 ml of deionized water. The butyl acetate layer was dried with anhydrous magnesium sulfate for 24 hours, filtered, and the organic solvent was removed at 90°C under negative pressure to obtain the target product. Yield: 88%, HPLC purity: 95.7%.

[0042] Infrared spectral data: 543.7 cm⁻¹ -1 624.8 cm -1 680.7 cm -1 813.5 cm -1 860.8 cm -1 923.1 cm-1 1036.5 cm -1 1122.7cm -1 1375.4 cm -1 1460.8 cm -1 1584.2 cm -1 1635.6 cm -1 1765.4 cm -1 1905.2 cm -1 2548.5 cm -1 2857.2 cm -1 2916.3 cm -1 3465.9cm -1 .

[0043] 1H NMR data: 2.48 ppm, 2.63 ppm, 2.69 ppm, 2.73 ppm, 2.79 ppm, 2.94 ppm, 3.58 ppm, 5.76 ppm.

[0044] Example 3: Preparation of cyclic sulfur compound II In a four-necked flask under nitrogen protection, 103.2 g (0.5 mol) of 1,2,4,5-tetramercaptobenzene, 1050 ml of chloroform, 120 ml of methanol, 0.41 g of tetrabutylammonium bromide, and 203.5 g (2.2 mol) of cyclothiochloropropane were stirred at room temperature to form a homogeneous liquid. The temperature was controlled at -10°C, and 150 g of 25% sodium hydroxide aqueous solution was added to the reaction flask at a rate of 5 ml / min. After the addition was completed, the reaction was continued for 5.5 hours. The reaction liquid was added to a separatory funnel, and the aqueous layer was separated. The organic layer was washed five times with deionized water, each time with 500 ml of deionized water. The organic layer was dried with anhydrous magnesium sulfate for 24 hours, filtered, and the organic solvent was removed under negative pressure at 40°C to obtain the target product. Yield: 70%, HPLC purity: 89.3%.

[0045] Infrared spectral data: 631.6 cm⁻¹ -1 697.6 cm -1 735.7 cm -1 843.7 cm -1 896.3 cm -1 961.8 cm -1 1141.7 cm -1 1207.7 cm -1 1266.0 cm -1 1428.5 cm -1 2547.9 cm -1 2833.8 cm-1 2922.1 cm -1 3044.1 cm -1 .

[0046] 1H NMR data: 1.24 ppm, 2.19 ppm, 2.23 ppm, 2.51 ppm, 3.36 ppm, 5.29 ppm, 5.75 ppm, 6.86 ppm, 7.24 ppm, 7.32 ppm.

[0047] Example 4: Preparation of cyclic sulfide compound II In a four-necked flask under nitrogen protection, 103.2 g (0.5 mol) of benzene, 200 ml of methanol, 0.75 g of tetrabutylammonium bromide, and 1480 g (16 mol) of sodium bicarbonate were stirred at room temperature to form a homogeneous liquid. The temperature was controlled at -5°C, and 260 g of 30% sodium bicarbonate aqueous solution was added to the reaction flask at a rate of 3 ml / min. After the addition was completed, the reaction was continued for 4.5 hours. The reaction liquid was added to a separatory funnel, and the aqueous layer was separated. The organic layer was washed five times with deionized water, each time with 600 ml of deionized water. The organic layer was dried with anhydrous magnesium sulfate for 24 hours, filtered, and the organic solvent was removed at 90°C under negative pressure to obtain the target product. Yield: 78%, HPLC purity: 90.5%.

[0048] Infrared spectral data: 630.9 cm⁻¹ -1 694.2 cm -1 738.4 cm -1 841.9 cm -1 890.8 cm -1 959.2 cm -1 1143.5 cm -1 1209.1 cm -1 1268.2 cm -1 1430.1 cm -1 2545.7cm -1 2835.2cm -1 2924.8 cm -1 3047.3 cm -1 .

[0049] 1H NMR data: 1.27 ppm, 2.25 ppm, 2.27 ppm, 2.54 ppm, 3.39 ppm, 5.31 ppm, 5.72 ppm, 6.89 ppm, 7.26 ppm, 7.34 ppm.

[0050] Example 5: Lens Fabrication I. Lens Manufacturing Methods Step 1: According to the proportions of each raw material shown in Table 1, mix the cyclic sulfur compound, diisocyanate, polythiol compound, catalyst and antioxidant prepared in Examples 1-4 evenly to obtain the lens liquid; The second step is to vacuum degas the prepared lens liquid for 20 minutes, filter it with a 3-micron polytetrafluoroethylene filter membrane, and inject the filtrate into the mold. The third step is to place the mold in a room temperature curing oven for curing, and cure it according to the following process: 55℃, 10h curing, 70℃, 5h curing, 60℃, 1h curing, 100℃, 2h curing, 60℃, 1h curing.

[0051] Table 1. Proportions of raw materials for lens preparation

[0052] II. Performance Testing and Result Analysis 1. Testing method: (1) Refractive index test: The refractive index was measured at 20°C using an Abbe refractometer. (2) Falling ball impact test: FLR-Y15 spectacle lens falling cone ball impact tester was used, 16mm / 16g steel ball, height 1.27m; (3) Yellowness Index (YI) Test: The lens is 9mm thick and 75mm in diameter, and is circular. It was tested using a Minolta CM-5 colorimeter. , where x and y are chromaticity coordinates.

[0053] (4) Toughness performance test: Evaluation was conducted using the Falling Ball (FDA) performance test, performed on the FLR-Y15 spectacle lens falling cone ball impact tester, using 16mm / 16g steel balls at a height of 1.27m.

[0054] 2. Results Table 2. Lens performance test results

[0055] As shown in Table 2: The optical lenses prepared according to the embodiments of the present invention exhibit excellent comprehensive performance: the refractive index is above 1.74, and the highest is 1.771.

[0056] All embodiments passed rigorous drop ball impact tests, maintaining a low yellowness index and excellent optical performance. Compared with the comparative examples, the present invention significantly improves the toughness of the material while maintaining a high refractive index, successfully resolving the contradiction between high refractive index and high toughness.

[0057] Finally, it should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0059] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Therefore, if these modifications and variations to the embodiments of the present invention fall within the scope of the claims of the embodiments of the present invention and their equivalents, the embodiments of the present invention are also intended to include these modifications and variations.

Claims

1. A polycyclic sulfur compound, characterized in that, The polycyclic sulfur compounds include: 1,3,5-Benzenetricyclic thiopropyl sulfide, with the chemical structure shown in Formula I; Alternatively, 1,2,4,5-phenyltetracyclic thiopropyl sulfide, with the chemical structure shown in Formula II; ， 。 2. A method for preparing the polycyclic sulfur compound according to claim 1, characterized in that, The method includes: Step S1: Under an inert atmosphere, 1,3,5-benzenetrithiophenol or 1,2,4,5-tetramercaptobenzene is reacted with cyclothiochloropropane in an organic solvent and under alkaline conditions, respectively, with the addition of a catalyst to obtain the reactants. Step S2: Add an inorganic alkaline aqueous solution to the reactants. After the reaction is complete, extract, wash with water, dry, and remove the solvent under reduced pressure.

3. The method for preparing a polycyclic sulfur compound according to claim 2, characterized in that, In step S1, the reaction temperature is controlled between -10°C and -5°C.

4. The method for preparing a polycyclic sulfur compound according to claim 2, characterized in that, In step S2, the inorganic alkaline aqueous solution is added at a rate of 3-5 ml / min.

5. The method for preparing a polycyclic sulfur compound according to claim 2, characterized in that, The organic solvent is selected from at least one of acetone, butanone, and cyclohexanone.

6. The method for preparing a polycyclic sulfur compound according to claim 2, characterized in that, The alkaline conditions are provided by an aqueous solution of an inorganic base, wherein the inorganic base is selected from at least one of the following: Sodium hydroxide, potassium hydroxide, sodium carbonate, or sodium bicarbonate, in an aqueous solution with a concentration of 20%-30%.

7. The method for preparing a polycyclic sulfur compound according to claim 2, characterized in that, The catalyst is selected from tetrabutylammonium bromide or hexadecyltrimethylammonium bromide, and the mass of the catalyst used is 0.1%-0.5% of the total mass of the reactants.

8. The method for preparing a polycyclic sulfur compound according to claim 1, characterized in that, The molar ratio of 1,3,5-benzenetrithiophenol to cyclothiochloropropane is 1:3-1:12; the molar ratio of 1,2,4,5-tetramercaptobenzene to cyclothiochloropropane is 1:4.4-1:

32.

9. An optical material, characterized in that, It contains the polycyclic sulfur compound of claim 1 as a monomer component.

10. An optical lens, characterized in that, The method for manufacturing the optical lens includes: The polycyclic sulfur compound of claim 1 is mixed with diisocyanate, polythiol compound, catalyst and antioxidant to form a lens liquid; wherein the polycyclic sulfur compound, diisocyanate and polythiol compound comprise, by weight, 100 parts of polycyclic sulfur compound; 11.4-20.5 parts of diisocyanate; and 16.4-22.8 parts of polythiol compound. The lens liquid is vacuum degassed and filtered before being injected into a mold, followed by curing to obtain the optical lens.

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