A non-metallic fire-resistant, rat-proof and ant-proof optical cable and its processing method

Abstract

The present invention relates to the field of optical cable technology, and specifically to a non-metallic fire-resistant, rat-proof and ant-proof optical cable and a processing method. A non-metallic fire-resistant, rat-proof and ant-proof optical cable comprises a cable core, an insulation layer, a sheath layer and a rat-proof and ant-proof layer arranged in sequence from the inside to the outside. The present invention reacts palmitic acid and capsaicin to form capsaicin palmitate. Palmitic acid combines with capsaicin, and capsaicin can attack mice through a group. The slightly volatile odor of palmitate enhances the rat-repelling effect, thereby achieving a repelling effect. In addition, the odor emitted by the palmitate formed by palmitic acid and capsaicin also has a certain repelling effect on ants. In addition, the reaction between palmitic acid and capsaicin will not destroy the group of capsaicin used to repel rats and ants, and its rat-repelling irritation is retained. The fat-soluble structure of capsaicin palmitate can slowly release active ingredients in the coating, and permanently repel rats and ants from gnawing on the optical cable.

Description

Technical Field

[0001] The present invention relates to the technical field of optical cables, and in particular to a non-metallic fire-resistant, rat-proof and ant-proof optical cable and a processing method thereof. Background Art

[0002] With the rapid development of communications technology, optical fiber cables are increasingly being used in fields such as power generation, communications, and rail transit. However, during installation, optical cables are often threatened by rodents and termites. This is particularly true in underground pipelines, cable wells, and overhead cable installations. These damage often leads to cable failures, seriously impacting the stability and security of communications systems.

[0003] Traditional rat and ant-proof optical cables mainly adopt mechanical protection or add chemical rat and ant repellents such as capsaicin. Capsaicin can trigger a neurogenic inflammatory response in mammals, causing mice to feel uncomfortable and thus avoid contact with capsaicin. At the same time, capsaicin has a spicy taste and has a strong stimulating effect on the olfactory system of termites, which can repel termites. However, when capsaicin is directly added to the optical cable sheath material, during the use of the optical cable, there is a temperature rise, which causes capsaicin to precipitate from the sheath and undergo thermal decomposition in a high temperature environment, resulting in a significant decrease in the capsaicin content of the optical cable after long-term use, and the rat and ant repellent effect also decreases accordingly; at the same time, natural capsaicin has high polarity and is easily unevenly dispersed in non-polar polymer matrices such as polyethylene, EVA and other traditional cable material sheath components, and is easy to migrate and precipitate, resulting in poor rat repellent effect. Therefore, the present application provides a non-metallic fire-resistant rat and ant-proof optical cable and a processing method to solve the problems existing in the above-mentioned prior art. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide a non-metallic fire-resistant, rat-proof and ant-proof optical cable and a processing method.

[0005] A non-metallic fire-resistant, rat-proof and ant-proof optical cable, comprising a cable core, an insulation layer, a sheath layer and a rat-proof and ant-proof layer arranged in sequence from the inside to the outside;

[0006] The cable core is made of glass fiber reinforced plastic containing optical units, and the insulation layer is a polyimide composite film wrapped around the outer layer of the cable core. The polyimide composite film is a composite structure of three layers of polytetrafluoroethylene film-polyimide film-polytetrafluoroethylene film bonded together in pairs.

[0007] The sheath layer is a cable sheath made of a mixture of silicone rubber, acrylate, epoxy resin curing agent and polytetrafluoroethylene;

[0008] The rat and ant proof layer is obtained by coating a rat and ant proof coating prepared by mixing acrylic resin, aluminum tripolyphosphate, barium sulfate and capsaicin derivatives on the outer layer of the optical cable sheath.

[0009] A method for processing a non-metallic fire-resistant, rat-proof and ant-proof optical cable comprises the following steps:

[0010] S1: Optical units and glass fiber reinforced plastics are twisted into a cable core, and a polyimide composite film is wrapped around the outer layer of the cable core. The polyimide composite film is a composite structure of three layers of polytetrafluoroethylene film-polyimide film-polytetrafluoroethylene film bonded together in pairs to form an insulation layer;

[0011] S2: 20-30 parts by mass of silicone rubber, 8-12 parts by mass of acrylic acid and 10-15 parts by mass of polytetrafluoroethylene are crushed and mixed, and stirred at a speed of 800-1000 r / min for 30-35 minutes. During the stirring process, 5-8 parts by mass of silane coupling agent and 2-4 parts by mass of defoaming agent are added, followed by extrusion and granulation at 140-150°C, standing and cooling to room temperature of 22-24°C, and then mixing in an internal mixer for 5-10 minutes, and then vulcanizing at 150-155°C for 15-18 minutes to obtain an optical cable sheath, which is wrapped around the outer layer of the insulation layer to form a sheath layer;

[0012] S3: 50-60 parts by mass of acrylic resin, 40-45 parts by mass of aluminum tripolyphosphate, 20-25 parts by mass of barium sulfate and 10-15 parts by mass of capsaicin derivative are mixed and stirred for 30-35 minutes to obtain a rodent-proof and ant-proof coating, and the rodent-proof and ant-proof coating is applied to the surface of the sheath layer, and air-dried to form a rodent-proof and ant-proof layer.

[0013] Furthermore, the preparation method of capsaicin derivatives specifically comprises the following steps:

[0014] 8-10 parts by mass of capsaicin lipid nanoparticles, 5-8 parts by mass of 5-carboxybenzotriazole and 60-65 parts by mass of toluene are mixed and stirred at a speed of 200-300 r / min for 5-10 minutes to mix evenly. Then, the temperature is raised to 70-75°C, and 0.5-1 parts by mass of initiator is added dropwise under a nitrogen atmosphere. The addition is completed slowly within 1.5-2 hours, and the temperature is maintained for the reaction for 48-50 hours. After the reaction, the toluene solvent is removed by reduced pressure distillation, and the capsaicin derivative is separated by column chromatography.

[0015] Furthermore, the preparation method of capsaicin lipid nanoparticles specifically includes the following steps:

[0016] 1-3 parts by mass of capsaicin palmitate, 0.2-0.5 parts by mass of lecithin and 0.3-0.5 parts by mass of polysorbate 80 are mixed and heated to 75-78°C, then added to 50-55 parts by mass of deionized water, ultrasonicated for 15-20 minutes, high-speed sheared for 5-8 minutes, then transferred to a 0-4°C ice water bath, ultrasonicated for 20-25 minutes, and then vacuum dried for 24-26 hours to obtain capsaicin lipid nanoparticles.

[0017] Furthermore, the preparation method of capsaicin palmitate specifically comprises the following steps:

[0018] Weigh 2-5 parts by weight of palmitic acid and 1-3 parts by weight of capsaicin and dissolve them in 8-10 parts by weight of xylene. Then add 3-4 wt% of p-toluenesulfonic acid. Heat to 130-135°C in a water bath, then cool to 80-85°C. Remove the xylene by vacuum distillation to obtain capsaicin palmitate.

[0019] Furthermore, the silane coupling agent is specifically silane coupling agent KH-570.

[0020] Furthermore, the defoaming agent is specifically a silicone defoaming agent.

[0021] Furthermore, the initiator is specifically azobisisobutylcyanide.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] 1. The present invention reacts palmitic acid and capsaicin to form capsaicin palmitate. Palmitic acid combines with capsaicin, and capsaicin can attack mice through groups. The slightly volatile odor of palmitate enhances the mouse repellent effect, thereby achieving a repellent effect. In addition, the odor emitted by the palmitate formed by palmitic acid and capsaicin also has a certain repellent effect on ants. Capsaicin palmitate significantly increases its molecular weight and forms chemical bonds, thereby reducing the vapor pressure and reducing the volatilization loss of capsaicin at room temperature, thereby reducing the volatilization and decomposition rate of capsaicin during long-term use. The formed structure is more stable than the original structure of capsaicin, delaying oxidative degradation. At the same time, the esterification product is more soluble in oils, waxes or polymer matrices, and the optical cable sheath material is mainly composed of polymers, which facilitates uniform dispersion on the surface of the sheath material. In addition, the reaction between palmitic acid and capsaicin does not destroy the groups of capsaicin used to repel mice and ants, and its mouse repellent irritation is retained.

[0024] 2. The present invention reacts capsaicin lipid nanoparticles prepared from capsaicin palmitate with 5-carboxybenzotriazole to prepare capsaicin derivatives. While capsaicin causes a burning sensation in the mouth of rodents, the structure of 5-carboxybenzotriazole can also interfere with the conduction of the mouse's olfactory nerves. The two synergistically form a dual repellent of taste and smell, with a better effect than a single component. In addition, the groups in the capsaicin lipid nanoparticles can react with the groups of 5-carboxybenzotriazole. Moreover, the substances produced by the decomposition of 5-carboxybenzotriazole at high temperatures can capture the active free radicals of the combustion chain reaction and delay the spread of flames. At the same time, the high-temperature oxidative decomposition of capsaicin consumes the active free radicals and combustion-supporting gases, thereby providing fire resistance to the optical cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable one skilled in the relevant art to make and use the present disclosure.

[0026] Figure 1 This is a flow chart of a method for processing a non-metallic fire-resistant, rodent-proof and ant-proof optical cable used in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following describes in detail a non-metallic fire-resistant, rodent-proof, and ant-proof optical cable and its processing method provided by the present invention, with reference to the accompanying drawings and specific embodiments. It is also noted that, for the sake of completeness, the following embodiments are best and preferred embodiments, and those skilled in the art may employ alternative implementations for known techniques. Furthermore, the accompanying drawings are intended only to provide a more detailed description of the embodiments and are not intended to limit the present invention.

[0028] Example 1

[0029] A method for processing a non-metallic fire-resistant, rat-proof and ant-proof optical cable, such as Figure 1 As shown, the cable comprises a cable core, an insulation layer, a sheath layer and a rodent and ant-proof layer arranged in sequence from the inside to the outside, and the preparation method thereof comprises the following steps:

[0030] S1: Optical units and glass fiber reinforced plastics are twisted into a cable core, and a polyimide composite film is wrapped around the outer layer of the cable core. The polyimide composite film is a composite structure of three layers of polytetrafluoroethylene film-polyimide film-polytetrafluoroethylene film bonded together in pairs to form an insulation layer.

[0031] S2: 20 parts by mass of silicone rubber, 8 parts by mass of acrylic acid and 10 parts by mass of polytetrafluoroethylene were crushed and mixed, and stirred at a speed of 800 r / min for 30 minutes. During the stirring process, 5 parts by mass of silane coupling agent KH-570 and 2 parts by mass of silicone defoaming agent were added. Then, the mixture was extruded and granulated at 140°C, allowed to cool to room temperature of 22°C, and then mixed in an internal mixer for 5 minutes. Then, the mixture was vulcanized at 150°C for 15 minutes to obtain an optical cable sheath. The optical cable sheath was wrapped around the outer layer of the insulation layer to form a sheath layer.

[0032] S3: Weigh 2 parts by mass of palmitic acid and 1 part by mass of capsaicin and dissolve them in 8 parts by mass of xylene. Then add 3 wt% of p-toluenesulfonic acid. Heat to 130°C in a water bath, then cool to 80°C. Remove the xylene by vacuum distillation to obtain capsaicin palmitate.

[0033] 1 part by mass of capsaicin palmitate, 0.2 parts by mass of lecithin, and 0.3 parts by mass of polysorbate 80 were mixed and heated to 75°C. The mixture was then added to 50 parts by mass of deionized water, sonicated for 15 minutes, and high-speed sheared for 5 minutes. The mixture was then transferred to a 0°C ice-water bath, sonicated for 20 minutes, and then vacuum-dried for 24 hours to obtain capsaicin lipid nanoparticles.

[0034] 8 parts by mass of capsaicin lipid nanoparticles, 5 parts by mass of 5-carboxybenzotriazole and 60 parts by mass of toluene were mixed and stirred at a speed of 200 r / min for 5 minutes to mix evenly. The temperature was then raised to 70°C, and 0.5 parts by mass of initiator azobisisobutyl cyanide was slowly added dropwise under a nitrogen atmosphere over 1.5 hours. The temperature was maintained for 48 hours. After the reaction, the toluene solvent was removed by distillation under reduced pressure, and the capsaicin derivative was separated by column chromatography.

[0035] 50 parts by mass of acrylic resin, 40 parts by mass of aluminum tripolyphosphate, 20 parts by mass of barium sulfate, and 10 parts by mass of a capsaicin derivative were mixed and stirred for 30 minutes to obtain a rodent-proof and ant-proof coating, which was then applied to the surface of the sheath layer and air-dried to form a rodent-proof and ant-proof layer;

[0036] The cable core, insulation layer, sheath layer and rat and ant proof layer are arranged in sequence from the inside to the outside to obtain a non-metallic fire-resistant rat and ant proof optical cable.

[0037] Example 2

[0038] A method for processing a non-metallic fire-resistant, rat-proof and ant-proof optical cable, such as Figure 1 As shown, the cable comprises a cable core, an insulation layer, a sheath layer and a rodent and ant-proof layer arranged in sequence from the inside to the outside, and the preparation method thereof comprises the following steps:

[0039] S1: Glass fiber reinforced plastic is twisted into a cable core, and a polyimide composite film is wrapped around the outer layer of the cable core. The polyimide composite film is a composite structure of three layers of polytetrafluoroethylene film-polyimide film-polytetrafluoroethylene film bonded together in pairs to form an insulation layer.

[0040] S2: 20 parts by mass of silicone rubber, 8 parts by mass of acrylic acid and 10 parts by mass of polytetrafluoroethylene were crushed and mixed, and stirred at a speed of 1000 r / min for 35 minutes. During the stirring process, 5 parts by mass of silane coupling agent KH-570 and 2 parts by mass of silicone defoaming agent were added. Then, the mixture was extruded and granulated at 150°C, allowed to cool to room temperature of 24°C, and then mixed in an internal mixer for 10 minutes. Then, the mixture was vulcanized at 155°C for 18 minutes to obtain an optical cable sheath. The optical cable sheath was wrapped around the outer layer of the insulation layer to form a sheath layer.

[0041] S3: Weigh 2 parts by mass of palmitic acid and 1 part by mass of capsaicin and dissolve them in 8 parts by mass of xylene. Then add 3 wt% of p-toluenesulfonic acid. Heat to 135°C in a water bath, then cool to 85°C. Remove the xylene by vacuum distillation to obtain capsaicin palmitate.

[0042] 1 part by mass of capsaicin palmitate, 0.2 parts by mass of lecithin, and 0.3 parts by mass of polysorbate 80 were mixed and heated to 78°C, then added to 50 parts by mass of deionized water, sonicated for 20 minutes, high-speed sheared for 8 minutes, then transferred to a 4°C ice water bath, sonicated for 25 minutes, and then vacuum dried for 26 hours to obtain capsaicin lipid nanoparticles;

[0043] 8 parts by mass of capsaicin lipid nanoparticles, 5 parts by mass of 5-carboxybenzotriazole and 60 parts by mass of toluene were mixed and stirred at a speed of 300 r / min for 10 minutes to mix evenly. Then, the temperature was raised to 75°C, and 1 part by mass of initiator azobisisobutyl cyanide was added dropwise under a nitrogen atmosphere. The addition was completed slowly within 2 hours, and the temperature was maintained for 50 hours. After the reaction, the toluene solvent was removed by vacuum distillation, and the capsaicin derivative was separated by column chromatography.

[0044] 50 parts by mass of acrylic resin, 40 parts by mass of aluminum tripolyphosphate, 20 parts by mass of barium sulfate, and 10 parts by mass of a capsaicin derivative were mixed and stirred for 35 minutes to obtain a rodent-proof and ant-proof coating, which was then applied to the surface of the sheath layer and air-dried to form a rodent-proof and ant-proof layer;

[0045] The cable core, insulation layer, sheath layer and rat and ant proof layer are arranged in sequence from the inside to the outside to obtain a non-metallic fire-resistant rat and ant proof optical cable.

[0046] Example 3

[0047] A method for processing a non-metallic fire-resistant, rat-proof and ant-proof optical cable, such as Figure 1 As shown, the cable comprises a cable core, an insulation layer, a sheath layer and a rodent and ant-proof layer arranged in sequence from the inside to the outside, and the preparation method thereof comprises the following steps:

[0048] S1: Glass fiber reinforced plastic is twisted into a cable core, and a polyimide composite film is wrapped around the outer layer of the cable core. The polyimide composite film is a composite structure of three layers of polytetrafluoroethylene film-polyimide film-polytetrafluoroethylene film bonded together in pairs to form an insulation layer.

[0049] S2: 30 parts by mass of silicone rubber, 12 parts by mass of acrylic acid and 15 parts by mass of polytetrafluoroethylene were crushed and mixed, and stirred at a speed of 800 r / min for 30 minutes. During the stirring process, 8 parts by mass of silane coupling agent KH-570 and 4 parts by mass of silicone defoaming agent were added. Then, the mixture was extruded and granulated at 140°C, allowed to cool to room temperature of 22°C, and then mixed in an internal mixer for 5 minutes. Then, the mixture was vulcanized at 150°C for 15 minutes to obtain an optical cable sheath. The optical cable sheath was wrapped around the outer layer of the insulation layer to form a sheath layer.

[0050] S3: Weigh 5 parts by mass of palmitic acid and 3 parts by mass of capsaicin and dissolve them in 10 parts by mass of xylene. Then add 4 wt% of p-toluenesulfonic acid. Heat to 130°C in a water bath, then cool to 80°C. Remove the xylene by vacuum distillation to obtain capsaicin palmitate.

[0051] 3 parts by mass of capsaicin palmitate, 0.5 parts by mass of lecithin, and 0.5 parts by mass of polysorbate 80 were mixed and heated to 75°C. The mixture was then added to 50 parts by mass of deionized water, sonicated for 15 minutes, and high-speed sheared for 5 minutes. The mixture was then transferred to a 0°C ice-water bath, sonicated for 20 minutes, and then vacuum-dried for 24 hours to obtain capsaicin lipid nanoparticles.

[0052] 10 parts by mass of capsaicin lipid nanoparticles, 8 parts by mass of 5-carboxybenzotriazole and 65 parts by mass of toluene were mixed and stirred at a speed of 200 r / min for 5 minutes to mix evenly. Then, the temperature was raised to 70°C, and 1 part by mass of initiator azobisisobutyl cyanide was added dropwise under a nitrogen atmosphere. The addition was completed slowly over 1.5 hours, and the temperature was maintained for 48 hours. After the reaction, the toluene solvent was removed by distillation under reduced pressure, and the capsaicin derivative was separated by column chromatography.

[0053] 60 parts by mass of acrylic resin, 45 parts by mass of aluminum tripolyphosphate, 25 parts by mass of barium sulfate, and 15 parts by mass of a capsaicin derivative were mixed and stirred for 30 minutes to obtain a rodent-proof and ant-proof coating, which was then applied to the surface of the sheath layer and air-dried to form a rodent-proof and ant-proof layer;

[0054] The cable core, insulation layer, sheath layer and rat and ant proof layer are arranged in sequence from the inside to the outside to obtain a non-metallic fire-resistant rat and ant proof optical cable.

[0055] Comparative Example 1:

[0056] Compared with Example 1, the difference of Comparative Example 1 is that capsaicin palmitate is not prepared in step S3, but capsaicin is used instead of capsaicin palmitate, specifically, "1 part by mass of capsaicin, 0.2 parts by mass of lecithin and 0.3 parts by mass of polysorbate-80 are mixed and heated to 75°C, then added to 50 parts by mass of deionized water, ultrasonicated for 15 minutes, high-speed sheared for 5 minutes, then transferred to a 0°C ice water bath, ultrasonicated for 20 minutes, and then vacuum dried for 24 hours to obtain capsaicin lipid nanoparticles;

[0057] 8 parts by mass of capsaicin lipid nanoparticles, 5 parts by mass of 5-carboxybenzotriazole and 60 parts by mass of toluene were mixed and stirred at a speed of 200 r / min for 5 minutes to mix evenly. The temperature was then raised to 70°C, and 0.5 parts by mass of initiator azobisisobutyl cyanide was slowly added dropwise under a nitrogen atmosphere over 1.5 hours. The temperature was maintained for 48 hours. After the reaction, the toluene solvent was removed by distillation under reduced pressure, and the capsaicin derivative was separated by column chromatography.

[0058] 50 parts by mass of acrylic resin, 40 parts by mass of aluminum tripolyphosphate, 20 parts by mass of barium sulfate, and 10 parts by mass of a capsaicin derivative were mixed and stirred for 30 minutes to obtain a rodent-proof and ant-proof coating, which was then applied to the surface of the sheath layer and air-dried to form a rodent-proof and ant-proof layer;

[0059] The cable core, insulation layer, sheath layer and rat and ant proof layer are sequentially arranged from the inside to the outside to obtain a non-metallic fire-resistant, rat and ant proof optical cable. The remaining steps remain unchanged, and the prepared non-metallic fire-resistant, rat and ant proof optical cable is recorded as Comparative Example 1.

[0060] Comparative Example 2:

[0061] Compared with Example 1, the difference of Comparative Example 2 is that capsaicin palmitate is not prepared in step S3, but palmitate is used instead of capsaicin palmitate, specifically: "S2: 1 part by mass of palmitate, 0.2 part by mass of lecithin and 0.3 part by mass of polysorbate 80 are mixed and heated to 75°C, and then added to 50 parts by mass of deionized water, ultrasonicated for 15 minutes, high-speed sheared for 5 minutes, then transferred to a 0°C ice water bath, ultrasonicated for 20 minutes, and then vacuum dried for 24 hours to obtain lipid nanoparticles;

[0062] 8 parts by mass of lipid nanoparticles, 5 parts by mass of 5-carboxybenzotriazole and 60 parts by mass of toluene were mixed and stirred at a speed of 200 r / min for 5 minutes to mix evenly. The temperature was then raised to 70°C, and 0.5 parts by mass of initiator azobisisobutylcyanide was slowly added dropwise under a nitrogen atmosphere over 1.5 hours. The temperature was maintained for 48 hours. After the reaction, the toluene solvent was removed by distillation under reduced pressure, and capsaicin derivatives were separated by column chromatography.

[0063] 50 parts by mass of acrylic resin, 40 parts by mass of aluminum tripolyphosphate, 20 parts by mass of barium sulfate, and 10 parts by mass of a capsaicin derivative were mixed and stirred for 30 minutes to obtain a rodent-proof and ant-proof coating, which was then applied to the surface of the sheath layer and air-dried to form a rodent-proof and ant-proof layer;

[0064] The cable core, insulation layer, sheath layer and rodent and ant-proof layer are arranged in sequence from the inside to the outside to obtain a non-metallic fire-resistant, rodent and ant-proof optical cable. In the subsequent steps, sulfonated epoxy resin is used instead of sulfonated phenolic resin. The other steps remain unchanged. The prepared non-metallic fire-resistant, rodent and ant-proof optical cable is recorded as Comparative Example 2.

[0065] Comparative Example 3:

[0066] Compared with Example 1, the difference of Comparative Example 3 is that 5-carboxybenzotriazole is not added in step S3. Specifically, “S3: 2 parts by mass of palmitic acid and 1 part by mass of capsaicin are weighed and dissolved in 8 parts by mass of xylene, and then 3 wt% of p-toluenesulfonic acid is added. The mixture is heated to 130° C. in a water bath, then cooled to 80° C., and xylene is removed by distillation under reduced pressure to obtain capsaicin palmitate;

[0067] 1 part by mass of capsaicin palmitate, 0.2 parts by mass of lecithin, and 0.3 parts by mass of polysorbate 80 were mixed and heated to 75°C. The mixture was then added to 50 parts by mass of deionized water, sonicated for 15 minutes, and high-speed sheared for 5 minutes. The mixture was then transferred to a 0°C ice-water bath, sonicated for 20 minutes, and then vacuum-dried for 24 hours to obtain capsaicin lipid nanoparticles.

[0068] 8 parts by mass of capsaicin lipid nanoparticles and 60 parts by mass of toluene were mixed and stirred at a speed of 200 r / min for 5 minutes to mix uniformly. The temperature was then raised to 70°C, and 0.5 parts by mass of azobisisobutyl cyanide as an initiator was added dropwise under a nitrogen atmosphere over 1.5 hours. The temperature was maintained for 48 hours. After the reaction was completed, the toluene solvent was removed by distillation under reduced pressure, and the capsaicin derivative was separated by column chromatography.

[0069] 50 parts by mass of acrylic resin, 40 parts by mass of aluminum tripolyphosphate, 20 parts by mass of barium sulfate, and 10 parts by mass of a capsaicin derivative were mixed and stirred for 30 minutes to obtain a rodent-proof and ant-proof coating, which was then applied to the surface of the sheath layer and air-dried to form a rodent-proof and ant-proof layer;

[0070] The cable core, insulation layer, sheath layer and rat and ant proof layer are sequentially arranged from the inside to the outside to obtain a non-metallic fire-resistant, rat and ant proof optical cable. The remaining steps remain unchanged, and the prepared non-metallic fire-resistant, rat and ant proof optical cable is recorded as Comparative Example 3.

[0071] Comparative Example 4:

[0072] Comparative Example 4 is a commercially available non-metallic rat-proof and ant-proof optical cable.

[0073] The non-metallic fire-resistant, rat-proof and ant-proof optical cables of Examples 1-3 and Comparative Examples 1-4 were respectively subjected to the tests in GB / T34016-2017 "General Rules for Rat-proof and Ant-proof Wires and Cables" to evaluate their rat-proof and ant-proof levels. The test results are shown in Table 1.

[0074] Equal amounts of capsaicin used in Example 1 and capsaicin palmitate prepared using the method in Example 1 were placed at 100°C for 24 hours. The contents of vanillamide groups in capsaicin and capsaicin palmitate before and after placement were measured by high performance liquid chromatography, and the decomposition rates were calculated, as shown in Table 2.

[0075] Capsaicin decomposition rate = vanillylamide content of capsaicin after 24 hours / vanillylamide content of capsaicin before 24 hours * 100%;

[0076] Capsaicin palmitate decomposition rate = the content of vanillylamide groups in capsaicin palmitate after 24 hours / the content of vanillylamide groups in capsaicin palmitate before 24 hours * 100%.

[0077] The non-metallic fire-resistant, rodent-proof and ant-proof optical cables of Examples 1-3 and Comparative Examples 3-4 were subjected to fire resistance tests according to the test method in GB / T2406.2-2009 "Determination of combustion behavior of plastics by oxygen index method Part 2: Room temperature test", and the results are shown in Table 3.

[0078]

[0079]

[0080]

[0081] As can be seen from Table 1, the rodent-proof rating of Examples 1-3 is FS2, and the ant-proof rating is FY1. The ant-proof rating of Comparative Examples 1-4 is also FY1. It can be seen that capsaicin and palmitate both have certain ant-proof capabilities.

[0082] The rodent-proof ability is determined through a standard rodent gnawing test. If the cable is placed among standard rodents and there is no obvious damage or functional failure on the surface within the specified time, it is rated as FS1. FS2 is achieved by replacing the rodents with more aggressive species and extending the test time. FS2 indicates better rodent-proof ability than FS1. It can be seen that the rodent-proof ratings of Comparative Examples 1-4 are all lower than FS2. It can be seen that the raw material combination of the present invention has better rodent-proof ability.

[0083] As can be seen from Table 2, the decomposition rate of capsaicin at 100°C for 24 hours reaches 50.6%, while the decomposition rate of capsaicin palmitate at 100°C for 24 hours is only 30.1%, which is lower than that of capsaicin. It can be seen that capsaicin palmitate has better stability.

[0084] As can be seen from Table 3, the oxygen index of Examples 1-3 is above 33.2%, while that of Comparative Example 3 is only 25.3% because no 5-carboxybenzotriazole is added, and that of the commercially available product of Comparative Example 4 is 30.4%. It can be seen that the present invention has better fire resistance.

[0085] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A non-metallic fire-resistant, rat-proof and ant-proof optical cable, comprising a cable core, an insulation layer, a sheath layer and a rat-proof and ant-proof layer arranged in sequence from the inside to the outside; The cable core is made of glass fiber reinforced plastic containing optical units, and the insulation layer is a polyimide composite film wrapped around the outer layer of the cable core. The polyimide composite film is a composite structure of three layers of polytetrafluoroethylene film-polyimide film-polytetrafluoroethylene film bonded together in pairs. The sheath layer is a cable sheath made of a mixture of silicone rubber, acrylate, epoxy resin curing agent and polytetrafluoroethylene; The anti-rat and anti-ant layer is prepared by mixing acrylic resin, aluminum tripolyphosphate, barium sulfate and capsaicin derivatives and is coated on the outer layer of the optical cable sheath; Capsaicin derivatives are obtained including capsaicin palmitate.

2. A method for processing the non-metallic fire-resistant, rodent-proof and ant-proof optical cable according to claim 1, characterized in that: The steps include: S1: Optical units and glass fiber reinforced plastics are twisted into a cable core, and a polyimide composite film is wrapped around the outer layer of the cable core. The polyimide composite film is a composite structure of three layers of polytetrafluoroethylene film-polyimide film-polytetrafluoroethylene film bonded together in pairs to form an insulation layer; S2: 20-30 parts by mass of silicone rubber, 8-12 parts by mass of acrylic acid and 10-15 parts by mass of polytetrafluoroethylene are crushed and mixed, and stirred at a speed of 800-1000 r / min for 30-35 minutes. During the stirring process, 5-8 parts by mass of silane coupling agent and 2-4 parts by mass of defoaming agent are added, followed by extrusion and granulation at 140-150°C, standing and cooling to room temperature of 22-24°C, and then mixing in an internal mixer for 5-10 minutes, and then vulcanizing at 150-155°C for 15-18 minutes to obtain an optical cable sheath, which is wrapped around the outer layer of the insulation layer to form a sheath layer; S3: 50-60 parts by mass of acrylic resin, 40-45 parts by mass of aluminum tripolyphosphate, 20-25 parts by mass of barium sulfate and 10-15 parts by mass of capsaicin derivative are mixed and stirred for 30-35 minutes to obtain a rodent-proof and ant-proof coating, and the rodent-proof and ant-proof coating is applied to the surface of the sheath layer, and air-dried to form a rodent-proof and ant-proof layer.

3. The method for processing a non-metallic fire-resistant, rodent-proof and ant-proof optical cable according to claim 2, characterized in that: The preparation method of capsaicin derivatives specifically comprises the following steps: 8-10 parts by mass of capsaicin lipid nanoparticles, 5-8 parts by mass of 5-carboxybenzotriazole and 60-65 parts by mass of toluene are mixed and stirred at a speed of 200-300 r / min for 5-10 minutes to mix evenly. Then, the temperature is raised to 70-75°C, and 0.5-1 parts by mass of initiator is added dropwise under a nitrogen atmosphere. The addition is completed slowly within 1.5-2 hours, and the temperature is maintained for the reaction for 48-50 hours. After the reaction, the toluene solvent is removed by reduced pressure distillation, and the capsaicin derivative is separated by column chromatography.

4. The method for processing a non-metallic fire-resistant, rodent-proof and ant-proof optical cable according to claim 3, characterized in that: The preparation method of capsaicin lipid nanoparticles specifically comprises the following steps: 1-3 parts by mass of capsaicin palmitate, 0.2-0.5 parts by mass of lecithin and 0.3-0.5 parts by mass of polysorbate 80 are mixed and heated to 75-78°C, then added to 50-55 parts by mass of deionized water, ultrasonicated for 15-20 minutes, high-speed sheared for 5-8 minutes, then transferred to a 0-4°C ice water bath, ultrasonicated for 20-25 minutes, and then vacuum dried for 24-26 hours to obtain capsaicin lipid nanoparticles.

5. The method for processing a non-metallic fire-resistant, rodent-proof and ant-proof optical cable according to claim 4, characterized in that: The preparation method of capsaicin palmitate specifically comprises the following steps: Weigh 2-5 parts by weight of palmitic acid and 1-3 parts by weight of capsaicin and dissolve them in 8-10 parts by weight of xylene. Then add 3-4 wt% of p-toluenesulfonic acid. Heat to 130-135°C in a water bath, then cool to 80-85°C. Remove the xylene by vacuum distillation to obtain capsaicin palmitate.

6. The method for processing a non-metallic fire-resistant, rodent-proof and ant-proof optical cable according to claim 2, characterized in that: The silane coupling agent is specifically silane coupling agent KH-570.

7. The method for processing a non-metallic fire-resistant, rodent-proof and ant-proof optical cable according to claim 2, characterized in that: The defoaming agent is specifically a silicone defoaming agent.

8. The method for processing a non-metallic fire-resistant, rodent-proof and ant-proof optical cable according to claim 3, characterized in that: The initiator is specifically azobisisobutylcyanide.

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