An environmentally friendly ant and rat proof cable

Abstract

The invention discloses an environment-friendly ant and rat-proof cable. The cable has an ant and rat-proof effect by adding azadirachtin, capsaicin and an auxiliary agent to a cable protective layer. The azadirachtin and capsaicin are natural plant extracts, which can be slowly released to achieve the effect of driving away rats and ants, and have no pollution to humans, livestock and the surrounding environment. The phenylthiourea structure in the auxiliary agent is a toxic rat and ant-repelling component, and has a wide range of antibacterial and bactericidal properties, and can prevent the cable from mildewing. The linked ethoxysilane structure can improve the adhesion of the auxiliary agent, avoid precipitation during use to cause cable performance degradation and environmental pollution, and can improve the dispersibility of the filler and improve the mechanical properties of the resin. The combustion of the silicon-oxygen structure in the auxiliary agent molecule can generate an inorganic oxygen-insulating and heat-insulating protective layer containing Si bonds and Si-C bonds, which can be flame-retardant and play a smoke-suppressing role. At the same time, the introduction of P and S elements can synergistically flame-retardant.

Description

Technical Field

[0001] The invention belongs to the technical field of cables, and in particular relates to an environmentally friendly ant and rat proof cable. Background Art

[0002] Rats and ants are a major threat to cables, and the resulting accidents result in significant economic losses each year. Ant bites can cause water or moisture to enter cables, leading to power outages, serious short circuits, and even fires. Therefore, the rat-ant and flame-retardant properties of cables are becoming increasingly important. Currently, there are two main methods for rat-ant resistance in cable products: physical methods, which use high-hardness materials to create a cable shield to prevent rat-ant damage; and chemical methods, which add chemicals to the cable shield to kill rats and ants through toxicity. Physical methods are costly, and high-hardness materials are not conducive to cable construction. Chemical methods, particularly in high humidity environments, are prone to precipitation of the rat-ant and ant-proofing material, resulting in a decrease in rat-ant and ant resistance and environmental pollution. Therefore, improving the timeliness of rat-ant and ant resistance and imparting flame retardancy are of significant practical significance for improving cable safety and durability. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide an environmentally friendly ant and rat proof cable.

[0004] The present invention achieves the effect of repelling rats and ants in the cable by adding azadirachtin, capsaicin and an auxiliary agent to the cable protective layer. Azadirachtin and capsaicin are natural plant extracts that can be slowly released to achieve the effect of repelling rats and ants, and are pollution-free to humans, animals and the surrounding environment. The phenylthiourea structure in the auxiliary agent is a toxic rat-and-ant repellent component and has broad antibacterial and bactericidal properties, thereby preventing the cable from mildewing. The linked ethoxysilane structure can improve the adhesion of the auxiliary agent, thereby avoiding precipitation during use that leads to degradation of cable performance and pollution to the environment. At the same time, the dispersibility of the filler can be improved, and the mechanical properties of the resin can be improved. The combustion of the silicon-oxygen structure in the auxiliary agent molecule can generate an inorganic oxygen-isolating and heat-insulating protective layer containing Si bonds and Si-C bonds, thereby achieving flame retardancy and smoke suppression. At the same time, the introduction of P and S elements can achieve synergistic flame retardancy.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An environmentally friendly ant and rat proof cable comprises a copper core conductor, an insulating layer and a protective layer arranged in sequence from the inside to the outside;

[0007] The insulation layer is made of polyethylene material and is covered on the outer surface of the copper core conductor;

[0008] The protective layer is coated on the outer surface of the insulating layer, and the protective layer comprises the following raw materials in parts by weight: 50-60 parts of polyvinyl chloride resin, 9-15 parts of filler, 3-4 parts of additive, 0.5-0.7 parts of azadirachtin, 0.5-0.7 parts of capsaicin, and 0.2-0.5 parts of lubricant;

[0009] The protective layer is prepared by the following steps:

[0010] The polyvinyl chloride resin, filler, additive, azadirachtin, capsaicin and lubricant are mixed in proportion and added to an internal mixer, heated and internally mixed for 10 minutes, and the mixture is put into a double-cone feeding single-screw extruder for plasticization and granulation. After cooling, the pellets are sent to an extruder for extrusion and coating on the outer surface of the insulation layer to form a protective layer.

[0011] Furthermore, the filler is a mixture of kaolin and magnesium hydroxide in a weight ratio of 1:2;

[0012] Furthermore, the lubricant is stearic acid monoglyceride;

[0013] Furthermore, the auxiliary agent is prepared by the following steps:

[0014] S1. In a flask equipped with a stirrer, a thermometer, and a reflux condenser, dimethylphosphine oxide and p-benzoquinone were added, and THF was added as a solvent. The heating temperature was controlled to 70°C and the reaction was refluxed for 8 hours. After the reaction was completed, the product was evaporated under reduced pressure to obtain intermediate 1; the ratio of dimethylphosphine oxide, p-benzoquinone, and tetrahydrofuran was 10 g:13.8 g:100 mL;

[0015] The active hydrogen in the PH structure of the dimethylphosphine oxide molecule can undergo an electrophilic reaction to introduce a substituent. By controlling the molar ratio of dimethylphosphine oxide to p-benzoquinone to be 1:1, it can undergo an addition reaction with the nucleophilic oxygen in the p-benzoquinone molecule to obtain intermediate 1. The specific reaction process is shown below:

[0016]

[0017] S2, intermediate 1 was added to a flask, DMF was added as a solvent, and the mixture was stirred for 10 min under nitrogen protection. Then, K2CO3 powder was added and stirred at room temperature for 30 min. Chloromethyltriethoxysilane was dissolved in DMF and then slowly added dropwise to the flask. After the addition was completed, the temperature was raised to 100°C and the reaction was carried out for 5 h. After the reaction was completed, the mixture was evaporated under reduced pressure to obtain intermediate 2; the amount ratio of intermediate 1, K2CO3, and chloromethyltriethoxysilane was 10 g:7.4 g:11.4 g;

[0018] The -OH on the intermediate 1 molecule undergoes a nucleophilic substitution reaction with the -Cl on the chloromethyltriethoxysilane molecule. K2CO3 is used as an acid-binding agent to control the molar ratio of the two to be close to 1:1, thereby obtaining intermediate 2. The specific reaction process is shown below:

[0019]

[0020] S3, intermediate 2 was added to a flask, DMF was added as a solvent, and the mixture was stirred for 10 min under nitrogen protection. Then, K2CO3 powder was added and stirred at room temperature for 30 min. p-Dichlorobenzene was dissolved in DMF and then slowly added dropwise to the flask. After the addition was completed, the temperature was raised to 80°C and the reaction was carried out for 5 h. After the reaction was completed, the mixture was evaporated under reduced pressure and recrystallized with petroleum ether and ethyl acetate to obtain intermediate 3; the amount ratio of intermediate 2, K2CO3, and p-dichlorobenzene was 10 g:3.8 g:4.1 g;

[0021] The -OH on the intermediate 2 molecule undergoes a nucleophilic substitution reaction with the -Cl on the p-dichlorobenzene molecule. K2CO3 acts as an acid-binding agent to control the molar ratio of the two to be close to 1:1, thereby obtaining intermediate 3. The specific reaction process is shown below:

[0022]

[0023] S4, intermediate 3 was placed in a flask, DMSO was added as a solvent, and the mixture was stirred for 10 min; thiourea and triethylamine were dissolved in DMSO and slowly added dropwise to the flask. After the addition was complete, the mixture was reacted at room temperature for 5 h. After the reaction was completed, the product was subjected to vacuum rotary evaporation to obtain an auxiliary agent; the ratio of intermediate 3, thiourea and triethylamine was 10 g:1.65 g:2.2 g;

[0024] Under the action of triethylamine, the -NH2 on the thiourea molecule and the -Cl on the intermediate 3 molecule undergo a nucleophilic substitution reaction. By controlling the molar ratio of the two to be close to 1:1, the following chemical reaction occurs to obtain the auxiliary agent:

[0025]

[0026] The phenylthiourea structure in the additive is a toxic rat and ant repellent ingredient, and also has broad antibacterial and bactericidal properties, which can prevent the cable from mildewing. The linked ethoxysilane structure is easily hydrolyzed to generate hydroxyl groups to bond with the filler, which can improve the adhesion of the additive and avoid precipitation during use, which leads to degradation of cable performance and pollution to the environment. At the same time, it can improve the dispersibility of the filler and improve the mechanical properties of the resin. Once the silicon-oxygen structure in the additive molecule burns, it will generate an inorganic oxygen-isolating and heat-insulating protective layer containing Si bonds and Si-C bonds, which is unique to siloxane. It is not only flame-retardant but also has a smoke-suppressing effect. At the same time, the introduction of P and S elements can synergistically flame retardant, accelerate the migration of flame-retardant ingredients to the surface, and promote the formation of a protective layer.

[0027] Beneficial effects of the present invention:

[0028] The present invention achieves the effect of repelling rats and ants in the cable by adding azadirachtin, capsaicin and an auxiliary agent to the cable protective layer. Azadirachtin and capsaicin are natural plant extracts that can be slowly released to achieve the effect of repelling rats and ants, and are pollution-free to humans, animals and the surrounding environment. The phenylthiourea structure in the auxiliary agent is a toxic rat-and-ant repellent component and has broad antibacterial and bactericidal properties, thereby preventing the cable from mildewing. The linked ethoxysilane structure can improve the adhesion of the auxiliary agent, thereby avoiding precipitation during use that leads to degradation of cable performance and pollution to the environment. At the same time, the dispersibility of the filler can be improved, and the mechanical properties of the resin can be improved. The combustion of the silicon-oxygen structure in the auxiliary agent molecule can generate an inorganic oxygen-isolating and heat-insulating protective layer containing Si bonds and Si-C bonds, thereby achieving flame retardancy and smoke suppression. At the same time, the introduction of P and S elements can achieve synergistic flame retardancy. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Example 1

[0031] Preparation aids:

[0032] S1. In a flask equipped with a stirrer, a thermometer, and a reflux condenser, 10 g of dimethylphosphine oxide, 13.8 g of p-benzoquinone, and 100 mL of THF as a solvent were added. The heating temperature was controlled to 70°C and the reaction was refluxed for 8 h. After the reaction was completed, the product was evaporated under reduced pressure to obtain intermediate 1;

[0033] S2, 10g of intermediate 1 was added to a flask, and DMF was added as a solvent. Under nitrogen protection, the mixture was stirred for 10min, and then 7.4g of K2CO3 powder was added. The mixture was stirred at room temperature for 30min. 11.4g of chloromethyltriethoxysilane was dissolved in DMF and then slowly added dropwise to the flask. After the addition was completed, the temperature was raised to 100°C and the reaction was carried out for 5h. After the reaction was completed, the mixture was evaporated under reduced pressure to obtain intermediate 2;

[0034] S3, 10 g of intermediate 2 was added to a flask, and DMF was added as a solvent. The mixture was stirred for 10 min under nitrogen protection, and then 3.8 g of K2CO3 powder was added. The mixture was stirred at room temperature for 30 min. 4.1 g of p-dichlorobenzene was dissolved in DMF and then slowly added dropwise to the flask. After the addition was completed, the temperature was raised to 80°C and the reaction was allowed to proceed for 5 h. After the reaction was completed, the mixture was evaporated under reduced pressure and recrystallized with petroleum ether and ethyl acetate to obtain intermediate 3;

[0035] S4. Place 10 g of intermediate 3 into a flask, add DMSO as a solvent, and stir for 10 min; dissolve 1.65 g of thiourea and 2.2 g of triethylamine in DMSO, and slowly drip into the flask. After the addition is complete, react at room temperature for 5 h. After the reaction is complete, the product is subjected to reduced pressure rotary evaporation to obtain an auxiliary agent.

[0036] Example 2

[0037] Preparation aids:

[0038] S1. In a flask equipped with a stirrer, a thermometer, and a reflux condenser, 20 g of dimethylphosphine oxide, 27.6 g of p-benzoquinone, and 200 mL of THF as a solvent were added. The heating temperature was controlled to 70°C and the reaction was refluxed for 8 h. After the reaction was completed, the product was evaporated under reduced pressure to obtain intermediate 1;

[0039] S2, 20g of intermediate 1 was added to a flask, DMF was added as a solvent, and the mixture was stirred for 10min under nitrogen protection. Then 14.8g of K2CO3 powder was added and stirred at room temperature for 30min. 22.8g of chloromethyltriethoxysilane was dissolved in DMF and then slowly added dropwise to the flask. After the addition was completed, the temperature was raised to 100°C and the reaction was carried out for 5h. After the reaction was completed, the mixture was evaporated under reduced pressure to obtain intermediate 2;

[0040] S3, 20g of intermediate 2 was added to a flask, and DMF was added as a solvent. The mixture was stirred for 10min under nitrogen protection, and then 7.6g of K2CO3 powder was added. The mixture was stirred at room temperature for 30min. 8.2g of p-dichlorobenzene was dissolved in DMF and then slowly added dropwise to the flask. After the addition was completed, the temperature was raised to 80°C and the reaction was carried out for 5h. After the reaction was completed, the mixture was evaporated under reduced pressure and recrystallized with petroleum ether and ethyl acetate to obtain intermediate 3;

[0041] S4. Place 20g of intermediate 3 into a flask, add DMSO as a solvent, and stir for 10min; dissolve 3.3g of thiourea and 4.4g of triethylamine in DMSO, and slowly drip into the flask. After the addition is complete, react at room temperature for 5h. After the reaction is complete, the product is subjected to reduced pressure rotary evaporation to obtain an auxiliary agent.

[0042] Example 3

[0043] Preparation of protective layer material:

[0044] 50 g of polyvinyl chloride resin, 3 g of kaolin, 6 g of magnesium hydroxide, 3 g of the additive prepared in Example 1, 0.5 g of azadirachtin, 0.5 g of capsaicin and 0.2 g of stearic acid monoglyceride were mixed in proportion and added to an internal mixer. The mixture was heated and internally kneaded for 10 minutes. The mixture was put into a double-cone feeding single-screw extruder for plasticization and granulation. After cooling, a protective layer material was obtained.

[0045] Example 4

[0046] Preparation of protective layer material:

[0047] 55 g of polyvinyl chloride resin, 4 g of kaolin, 8 g of magnesium hydroxide, 3.5 g of the additive prepared in Example 2, 0.6 g of azadirachtin, 0.6 g of capsaicin and 0.35 g of stearic acid monoglyceride were mixed in proportion and added to an internal mixer. The mixture was heated and internally kneaded for 10 minutes. The mixture was put into a double-cone feeding single-screw extruder for plasticization and granulation. After cooling, a protective layer material was obtained.

[0048] Example 5

[0049] Preparation of protective layer material:

[0050] 60 g of polyvinyl chloride resin, 5 g of kaolin, 10 g of magnesium hydroxide, 4 g of the additive prepared in Example 1, 0.7 g of azadirachtin, 0.7 g of capsaicin and 0.5 g of stearic acid monoglyceride were mixed in proportion and added to an internal mixer. The mixture was heated and internally kneaded for 10 minutes. The mixture was put into a double-cone feeding single-screw extruder for plasticization and granulation. After cooling, a protective layer material was obtained.

[0051] Comparative Example 1

[0052] Compared with Example 3, no auxiliary agent is added during the preparation process, and the other raw materials and preparation process remain unchanged to obtain protective layer granules.

[0053] The protective layer pellets obtained in Examples 3-5 and Control Group 1 were extruded into standard samples using an extruder and subjected to performance tests. The test results are as follows:

[0054]

[0055] It can be seen from the data in the above table that the protective layer material of Control Example 1 without adding additives has lower mechanical properties, a lower oxygen index, which means it is more flammable, and poor mildew and rodent-proof properties. Therefore, the addition of additives enables the protective layer granules obtained by the present invention to have good mechanical properties, flame retardant properties, mildew and rodent-proof properties.

[0056] Example 6

[0057] The outer surface of the copper core conductor is coated with polyethylene plastic to form an insulation layer, and the pellets prepared in Example 3 are fed into an extruder and extruded and coated on the outer surface of the insulation layer to form a protective layer, thereby obtaining an environmentally friendly ant and rat proof cable.

[0058] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0059] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. An environmentally friendly ant-proof cable, comprising a copper core conductor, an insulating layer and a protective layer arranged in sequence from the inside to the outside, characterized in that: The protective layer comprises the following raw materials in parts by weight: 50-60 parts of polyvinyl chloride resin, 9-15 parts of filler, 3-4 parts of auxiliary agent, 0.5-0.7 parts of azadirachtin, 0.5-0.7 parts of capsaicin, and 0.2-0.5 parts of lubricant; The auxiliary agent is prepared by the following steps: S1. In a flask equipped with a stirrer, a thermometer, and a reflux condenser, dimethylphosphine oxide, p-benzoquinone, and THF as a solvent were added, the heating temperature was controlled to 70°C, and the reflux reaction was carried out for 8 hours. After the reaction was completed, the product was evaporated under reduced pressure to obtain intermediate 1; the ratio of dimethylphosphine oxide, p-benzoquinone, and tetrahydrofuran was 10g:13.8g:100mL; S2, add intermediate 1 to a flask, add DMF as a solvent, stir for 10 minutes under nitrogen protection, then add K2CO3 powder, stir at room temperature for 30 minutes, dissolve chloromethyltriethoxysilane in DMF, and then slowly add it dropwise to the flask. After the addition is completed, heat to 100°C and react for 5 hours. After the reaction is completed, vacuum rotary evaporation is performed to obtain intermediate 2; the amount ratio of intermediate 1, K2CO3, and chloromethyltriethoxysilane is 10g:7.4g:11.4g; S3, add intermediate 2 to a flask, add DMF as a solvent, stir for 10 minutes under nitrogen protection, then add K2CO3 powder, stir at room temperature for 30 minutes, dissolve p-dichlorobenzene in DMF, and then slowly drop it into the flask, raise the temperature to 80°C after the addition is completed, react for 5 hours, and after the reaction is completed, evaporate under reduced pressure, recrystallize with petroleum ether and ethyl acetate to obtain intermediate 3; the amount ratio of intermediate 2, K2CO3, and p-dichlorobenzene is 10g:3.8g:4.1g; S4. Place intermediate 3 in a flask, add DMSO as a solvent, and stir for 10 minutes; dissolve thiourea and triethylamine in DMSO, and slowly drip into the flask. After the addition is complete, react at room temperature for 5 hours. After the reaction is completed, the product is subjected to reduced pressure rotary evaporation to obtain an auxiliary agent; the ratio of intermediate 3, thiourea and triethylamine used is 10g:1.65g:2.2g.

2. The environmentally friendly ant and rat proof cable according to claim 1, characterized in that: The filler is kaolin and magnesium hydroxide mixed in a weight ratio of 1:2.

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