CN112375310A

CN112375310A - Termite-proof cable and preparation method thereof

Info

Publication number: CN112375310A
Application number: CN202011018696.2A
Authority: CN
Inventors: 张大明; 黄维勇; 梁新
Original assignee: Shenzhen Huayi Telecom Industry Co ltd
Current assignee: Shenzhen Huayi Telecom Industry Co ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-02-19

Abstract

The application relates to the field of cables, and particularly discloses a termite-proof cable and a preparation method thereof. The termite-proof cable comprises a core layer and a sheath, wherein the sheath is prepared from the following raw materials: polyvinyl chloride, polyethylene, polyamide fiber, a dispersing agent, an antioxidant and an anti-termite agent, wherein the anti-termite agent comprises a rosin extract, bifenthrin and capsaicin, and in the extraction process of the rosin extract, methyl carbamate and sulfated castor oil are added for modification extraction. The preparation method of the termite-proof cable comprises the following steps: the core layer is prepared firstly, and then all raw materials of the sheath are mixed, heated and extruded, so that the sheath wraps the outer side of the core layer, and the termite-proof cable is formed. The termite-proof cable has good termite-proof performance and good mechanical property.

Description

Termite-proof cable and preparation method thereof

Technical Field

The application relates to the field of cables, in particular to a termite-proof cable and a preparation method thereof.

Background

A cable is a wire that transmits power or information from one place to another for connecting circuits, electrical appliances, and the like. The cable can be divided into a power cable, a control cable, a compensation cable, a shielding cable, a high-temperature cable, a computer cable, a signal cable, a coaxial cable, a fire-resistant cable, a marine cable, a mining cable, an aluminum alloy cable and the like, and the application of the cable is wide.

The existing cable comprises a core layer and a sheath, wherein the core layer is made of a conductive material, and the sheath is coated outside the core layer and made of a non-conductive material. Typically, the jacket is made of polyvinyl chloride.

In view of the above-mentioned related technologies, the inventor believes that the cable is partially buried under the ground in the use process, and is located in a wet place where termites are present, the sheath of the cable is easily bitten by the termites, which causes damage to the cable in the actual use process, and causes certain damage and potential danger. There is a need for a termite resistant cable.

Disclosure of Invention

In order to improve the performance of the cable for resisting the gnawing of termites, the application provides a termite-proof cable and a preparation method thereof.

In a first aspect, the application provides a termite-proof cable, which adopts the following technical scheme:

the termite-proof cable comprises a core layer and a sheath, wherein the sheath is coated on the surface of the core layer and is prepared from the following raw materials in parts by weight:

60-75 parts of polyvinyl chloride;

20-30 parts of polyethylene;

10-18 parts of polyamide fiber;

2-4 parts of a dispersant;

1-4 parts of an antioxidant;

0.5-1.5 parts of termite-resistant agent;

wherein the termite-resistant agent comprises rosin extract, bifenthrin and capsaicin, and the rosin extract is prepared by the following method:

the method comprises the following steps: raising the temperature of the rosin to 100-120 ℃, keeping the temperature for 10-15min, filtering while the rosin is hot, retaining the upper solution, adding turpentine oil with the volume of 0.8-1.2 times that of the upper solution after the upper solution is cooled, and uniformly stirring to obtain a first mixture;

step two: mixing the first mixture, methyl carbamate and sulfated castor oil, and stirring for 10-20min to obtain a second mixture, wherein the mass of the methyl carbamate is 2-5% of that of the first mixture, and the mass of the sulfated castor oil is 10-15% of that of the first mixture;

step three: and adding the second mixture into acidic ethanol for refluxing, crystallizing and separating out after extraction, and washing to obtain the rosin extract.

By adopting the technical scheme, the sheath mainly comprises the main body formed by the polyvinyl chloride and the polyethylene, has better mechanical property, and is cheap and easy to obtain. The dispersing agent can be used for uniformly dispersing the polyamide fibers, the antioxidant and the termite-resistant agent in the sheath, so that the sheath is uniform in all parts and stable in performance. The rosin extract can be used for cooperating with bifenthrin and capsaicin to improve the termite resistance of the cable. The addition of polyamide fibers can improve the strength of the sheath and improve the difficulty of termite bite. When the rosin extract is prepared, rosin is heated and filtered to remove redundant impurities, and then the rosin is mixed with methyl carbamate and sulfated castor oil, wherein the methyl carbamate is easy to combine with the rosin extract to form the rosin extract with termite resistance, the sulfated castor oil is added to facilitate the rosin extract to be dispersed in a cable sheath, and finally the required rosin extract is obtained after extraction and crystallization through acidic ethanol reflux. The termite-proof performance of the cable sheath can be effectively improved by adding the termite-proof agent into the cable sheath.

Preferably, the rosin extract is prepared by the following method:

the method comprises the following steps: raising the temperature of rosin to 115 ℃, keeping the temperature for 12min, filtering while the rosin is hot, retaining the upper solution, adding turpentine oil with the volume 1 time that of the upper solution after the rosin is cooled, and uniformly stirring to obtain a first mixture;

step two: mixing the first mixture, methyl carbamate and sulfated castor oil, and stirring for 15min to obtain a second mixture, wherein the mass of the methyl carbamate is 3% of that of the first mixture, and the mass of the sulfated castor oil is 12% of that of the first mixture;

By adopting the technical scheme, the technical scheme is adopted, and after the rosin extract is prepared by adopting the parameters, the obtained rosin extract is easy to disperse in the cable sheath, and the termite-proof effect of the cable can be improved.

Preferably, in the termite-resistant agent, the weight ratio of the rosin extract, bifenthrin and capsaicin is in the range of 1: (1.5-2.5): (1.5-2.5).

By adopting the technical scheme, when the weight ratio range of the rosin extract, the bifenthrin and the capsaicin is 1: (1.5-2.5): (1.5-2.5), the prepared cable has better termite resistance.

Preferably, in the termite-resistant agent, the weight ratio of the rosin extract, bifenthrin and capsaicin is in the range of 1: 2: 2.

by adopting the technical scheme, when the weight ratio range of the rosin extract, the bifenthrin and the capsaicin is 1: 2: 2, the prepared cable has better termite resistance.

Preferably, the capsaicin is modified capsaicin and is prepared by the following method:

the method comprises the following steps: uniformly mixing capsaicin, a red pine root extract and allethrin, adding silicone oil, heating to 70-80 ℃, uniformly stirring, and cooling to room temperature to obtain a first mixed substance, wherein the weight ratio of the capsaicin to the red pine root extract to the allethrin is 1: (0.1-0.2): (0.05-0.2), the weight of the silicone oil is 0.08-0.12 of the weight of the capsaicin;

step two: heating ethyl acrylate with the weight 5-8 times of that of capsaicin to 90-95 ℃, adding the first mixed substance obtained in the step one, uniformly stirring, and cooling to room temperature to obtain a second mixed substance;

step three: adding the second mixed substance obtained in the second step into the chitosan saturated solution, wherein the weight ratio of the second mixed substance to the chitosan saturated solution is 1: (1-3), adding polysorbate with the weight of 3-5% of that of the capsaicin into the mixed solution, stirring for 1-2h, and drying to obtain the modified capsaicin.

By adopting the technical scheme, when the capsaicin is modified, the capsaicin, the red pine root extract and the allethrin are mixed, the silicone oil is added for heating, the combination of the three can be promoted by the silicone oil, the three can be uniformly mixed, and the synergy of the capsaicin and the allethrin can be promoted by the addition of the red pine root extract, so that the termite resistance of the mixture is enhanced. And then adding ethyl acrylate to wrap the ethyl acrylate in the pretreated capsaicin so as to slowly release the capsaicin and improve the termite resistance duration of the cable. Finally, the chitosan-polysorbate modified capsaicin can be conveniently dispersed in the cable sheath, so that the cable has stable properties.

Preferably, the modified capsaicin is prepared by the following method:

the method comprises the following steps: uniformly mixing capsaicin, a red pine root extract and allethrin, adding silicone oil, heating to 75 ℃, uniformly stirring, and cooling to room temperature to obtain a first mixed substance, wherein the weight ratio of the capsaicin, the red pine root extract and the allethrin is 1: 0.15: 0.1, wherein the weight of the silicone oil is 0.1 of that of the capsaicin;

step two: heating ethyl acrylate with the weight 6 times that of capsaicin to 92 ℃, adding the first mixed substance obtained in the step one, uniformly stirring, and cooling to room temperature to obtain a second mixed substance;

step three: adding the second mixed substance obtained in the second step into the chitosan saturated solution, wherein the weight ratio of the second mixed substance to the chitosan saturated solution is 1: and 2, adding polysorbate accounting for 3.5 percent of the weight of the capsaicin into the mixed solution, stirring for 1.5h, and drying to obtain the modified capsaicin.

By adopting the technical scheme, after the modified capsaicin is prepared by adopting the parameters, the obtained modified capsaicin is easily dispersed in the cable sheath, and the termite-proof effect of the cable can be improved.

Preferably, the polyamide fiber is a modified polyamide fiber, which is prepared by the following method:

soaking polyamide fiber in water, and adding N-methyl oxime carbamate, sodium lignin sulfonate and fatty alcohol-polyoxyethylene ether sodium sulfate into the water, wherein the weight of the N-methyl oxime carbamate is 2-5% of that of the polyamide fiber, the weight of the sodium lignin sulfonate is 1-3% of that of the polyamide fiber, and the weight of the fatty alcohol-polyoxyethylene ether sodium sulfate is 1-3% of that of the polyamide fiber; raising the temperature to 40-60 ℃, soaking for 4-6h at the temperature, and drying to obtain the modified polyamide fiber.

By adopting the technical scheme, when the polyamide fiber is modified, N-methyl oxime carbamate, sodium lignosulfonate and fatty alcohol-polyoxyethylene ether sodium sulfate are added, wherein the sodium lignosulfonate and the fatty alcohol-polyoxyethylene ether sodium sulfate can facilitate the N-methyl oxime carbamate to coat the surface of the polyamide fiber, and the N-methyl oxime carbamate has certain termite-proof performance, so that the termite-proof performance of the cable can be effectively improved. In addition, the modified polyamide fibers can be used in conjunction with termite resistant agents to improve the termite resistance of the cable.

Preferably, the modified polyamide fiber is prepared by the following method:

soaking polyamide fiber in water, and adding N-methyl oxime carbamate, sodium lignin sulfonate and fatty alcohol-polyoxyethylene ether sodium sulfate into the water, wherein the weight of the N-methyl oxime carbamate is 4% of that of the polyamide fiber, the weight of the sodium lignin sulfonate is 2% of that of the polyamide fiber, and the weight of the fatty alcohol-polyoxyethylene ether sodium sulfate is 2% of that of the polyamide fiber; and raising the temperature to 55 ℃, soaking for 4.5 hours at the temperature, and drying to obtain the modified polyamide fiber.

By adopting the technical scheme, after the modified polyamide fiber is prepared by adopting the parameters, the obtained modified polyamide fiber is easily dispersed in the cable sheath, and the termite-proof effect of the cable can be improved.

Preferably, the dispersant is triethylhexylphosphoric acid.

By adopting the technical scheme, the triethyl hexyl phosphoric acid can well disperse various substances in the cable sheath, so that the cable has stable properties.

Preferably, the antioxidant is a hindered phenol antioxidant.

By adopting the technical scheme, the hindered phenol antioxidant can be well combined in the cable sheath, so that the service life of the cable sheath is prolonged.

Preferably, the sheath is prepared from the following raw materials in parts by weight:

65 parts of polyvinyl chloride;

25 parts of polyethylene;

15 parts of polyamide fiber;

3 parts of a dispersing agent;

2 parts of an antioxidant;

0.2 parts of rosin extract;

0.4 part of bifenthrin;

0.4 part of capsaicin.

By adopting the technical scheme, the cable sheath prepared by adopting the proportion has better termite-proof performance.

In a second aspect, the application provides a preparation method of a termite-proof cable, which adopts the following technical scheme:

a preparation method of a termite-proof cable comprises the following steps:

the method comprises the following steps: preparing a core layer;

step two: and (3) blending polyvinyl chloride, polyethylene, polyamide fiber, a dispersing agent, an antioxidant and a termite-resistant agent, heating to 160-180 ℃, stirring for 2-4h, extruding, and coating the outside of the core layer prepared in the step one to form a sheath, thus obtaining the termite-resistant cable.

By adopting the technical scheme, preferably, the first step comprises the steps of preparing the core layer, uniformly mixing the raw materials of the sheath, mixing, extruding and wrapping the raw materials outside the core layer to prepare the termite-proof cable. The method is simple and has strong practicability.

The following steps:

s11: drawing and annealing the copper monofilaments to obtain conductor wires, combining a plurality of conductor wires into a conductor bundle in a bundle twisting mode, and wrapping an insulating layer on the surface of the conductor bundle;

s12: and (4) winding and wrapping the product obtained in the step one by using a nylon material belt to form an inner liner layer attached to the outer side of the insulating layer to obtain the core layer.

Through adopting above-mentioned technical scheme, when preparing the sandwich layer, prepare the conductor earlier and restraint, make the cable can switch on, later at the surface parcel insulating layer of conductor restraint, prevent the electric leakage, later with nylon material area parcel in the insulating layer outside, form the inner liner, the intensity of cable can be strengthened to the inner liner, stops the termite to gnaw simultaneously.

Preferably, the preparation method of the termite-proof cable comprises the following steps:

the method comprises the following steps: preparing a core layer:

Step two: and (3) blending polyvinyl chloride, polyethylene, polyamide fiber, a dispersing agent, an antioxidant and a termite-resistant agent, heating to 165 ℃, stirring for 3 hours, extruding, and coating the outside of the core layer prepared in the step one to form a sheath, so as to obtain the termite-resistant cable.

By adopting the technical scheme, the termite-proof cable is prepared by adopting the parameters, and has better termite-proof performance.

In summary, the present application has the following beneficial effects:

1. because the rosin extract, the bifenthrin and the capsaicin are combined to form the termite-resistant agent, the rosin extract can be used for cooperating with the bifenthrin and the capsaicin, and the termite resistance of the cable is improved. The addition of the polyamide fiber can improve the strength of the sheath and the difficulty of biting by termites, and besides, the methyl carbamate is easy to combine with the rosin extract to form the rosin extract with termite resistance, so that the termite resistance of the cable is enhanced.

2. The modified capsaicin is preferably adopted in the application, the capsaicin is pretreated by allethrin, a red pine root extract and silicone oil, and the pretreated capsaicin is coated with a layer of ethyl acrylate to slowly release the capsaicin and prolong the termite resistance time of the cable.

3. The modified polyamide fiber is preferably adopted in the application, and is modified by N-methyl oxime carbamate, sodium lignosulfonate and fatty alcohol-polyoxyethylene ether sodium sulfate, so that the modified polyamide fiber has termite resistance and can be used as a synergistic termite-resistant agent, and in addition, the modified polyamide fiber can be better dispersed in a cable sheath.

4. According to the method, the core layer is formed firstly, and then the sheath is wrapped, so that the termite-proof cable is produced simply through the preparation method.

Detailed Description

The present application will be described in further detail with reference to examples.

The raw materials in the preparation examples and examples are commercially available, and some of the raw materials can be obtained from the sources shown in Table 1.

Name of substance	Source
		Polyvinyl chloride	S-1000-polyvinyl chloride produced by Qilu petrochemical industry
Polyethylene	HDPE-3364-polyethylene produced by Dow, USA
		Polyamide fibers	A3HG 7-Polyamide fibers from Basff Germany
Capsaicine	Capsaicin produced by Xian Yunyan grass Biotechnology Limited
		Turpentine oil	Turpentine oil produced by Komi Europe reagent Co., Ltd
Sulfated castor oil	Sulfated castor oil produced by Shanghai Baochi chemical Co., Ltd
		Pinus densiflora root extract	Pinus densiflora root extract produced by Shaanxi Yanling natural biological products Co
Chitosan	Chitosan produced by Shaanxi Saien Biotech Co., Ltd
		Hindered phenol type antioxidant	Hindered phenol type antioxidants of Santa Clarke AT10
Rosin	Rosin produced by Henan reputations chemical Limited

TABLE 1

Preparation example

Preparation example 1

A rosin extract is prepared by the following method:

the method comprises the following steps: heating 1kg of rosin to 100 ℃, keeping the temperature for 10min, filtering while the rosin is hot, retaining the upper solution, adding turpentine oil with the volume 1.2 times that of the upper solution after the upper solution is cooled, and uniformly stirring to obtain a first mixture;

step two: mixing the first mixture, methyl carbamate and sulfated castor oil, and stirring for 20min to obtain a second mixture, wherein the mass of the methyl carbamate is 5% of that of the first mixture, and the mass of the sulfated castor oil is 10% of that of the first mixture;

Preparation example 2

A rosin extract is prepared by the following method:

the method comprises the following steps: heating 1kg of rosin to 120 ℃, keeping the temperature for 15min, filtering while the rosin is hot, retaining the upper solution, adding turpentine oil with the volume 0.8 times that of the upper solution after the upper solution is cooled, and uniformly stirring to obtain a first mixture;

step two: mixing the first mixture, methyl carbamate and sulfated castor oil, and stirring for 10min to obtain a second mixture, wherein the mass of the methyl carbamate is 2% of that of the first mixture, and the mass of the sulfated castor oil is 15% of that of the first mixture;

Preparation example 3

A rosin extract is prepared by the following method:

the method comprises the following steps: heating 1kg of rosin to 115 ℃, keeping the temperature for 12min, filtering while the rosin is hot, retaining the upper solution, adding turpentine oil with the volume equal to that of the upper solution after the upper solution is cooled, and uniformly stirring to obtain a first mixture;

Preparation example 4

A modified capsaicin is prepared by the following steps:

the method comprises the following steps: uniformly mixing 1kg of capsaicin, 0.2kg of red pine root extract and 0.2kg of allethrin, adding 0.12kg of silicone oil, heating to 80 ℃, uniformly stirring, and cooling to room temperature to obtain a first mixed substance.

Step two: heating 8kg of ethyl acrylate to 90 ℃, adding the first mixed substance obtained in the step one, uniformly stirring, and cooling to room temperature to obtain a second mixed substance;

step three: adding the second mixed substance obtained in the second step into the chitosan saturated solution, wherein the weight ratio of the second mixed substance to the chitosan saturated solution is 1: and 3, adding 50g of polysorbate into the mixed solution, stirring for 2h, and drying to obtain the modified capsaicin.

Preparation example 5

A modified capsaicin is prepared by the following steps:

the method comprises the following steps: uniformly mixing 1kg of capsaicin, 0.1kg of red pine root extract and 0.05kg of allethrin, adding 0.08kg of silicone oil, heating to 80 ℃, uniformly stirring, and cooling to room temperature to obtain a first mixed substance.

Step two: heating 5kg of ethyl acrylate to 95 ℃, adding the first mixed substance obtained in the step one, uniformly stirring, and cooling to room temperature to obtain a second mixed substance;

step three: adding the second mixed substance obtained in the second step into the chitosan saturated solution, wherein the weight ratio of the second mixed substance to the chitosan saturated solution is 1: and 1, adding 30g of polysorbate into the mixed solution, stirring for 1h, and drying to obtain the modified capsaicin.

Preparation example 6

A modified capsaicin is prepared by the following steps:

the method comprises the following steps: uniformly mixing 1kg of capsaicin, 0.15kg of red pine root extract and 0.1kg of allethrin, adding 0.1kg of silicone oil, heating to 75 ℃, uniformly stirring, and cooling to room temperature to obtain a first mixed substance.

Step two: heating 6kg of ethyl acrylate to 92 ℃, adding the first mixed substance obtained in the step one, uniformly stirring, and cooling to room temperature to obtain a second mixed substance;

step three: adding the second mixed substance obtained in the second step into the chitosan saturated solution, wherein the weight ratio of the second mixed substance to the chitosan saturated solution is 1: and 2, adding 35g of polysorbate into the mixed solution, stirring for 1.5h, and drying to obtain the modified capsaicin.

Preparation example 7

A modified polyamide fiber is prepared by the following steps:

soaking 1kg of polyamide fiber in water, adding 20g of N-methyl oxime carbamate, 30g of sodium lignin sulfonate and 10g of fatty alcohol-polyoxyethylene ether sodium sulfate into the water, raising the temperature to 40 ℃, soaking for 6h at the temperature, and drying to obtain the modified polyamide fiber.

Preparation example 8

A modified polyamide fiber is prepared by the following steps:

soaking 1kg of polyamide fiber in water, adding 50g of N-methyl oxime carbamate, 10g of sodium lignin sulfonate and 30g of fatty alcohol-polyoxyethylene ether sodium sulfate into the water, raising the temperature to 60 ℃, soaking for 4 hours at the temperature, and drying to obtain the modified polyamide fiber.

Preparation example 9

A modified polyamide fiber is prepared by the following steps:

soaking 1kg of polyamide fiber in water, adding 40g of N-methyl oxime carbamate, 20g of sodium lignin sulfonate and 20g of sodium fatty alcohol-polyoxyethylene ether sulfate into the water, raising the temperature to 55 ℃, soaking for 4.5h at the temperature, and drying to obtain the modified polyamide fiber.

Examples

Example 1

A termite-resistant cable is prepared by the following method:

the method comprises the following steps: preparing a core layer:

s11: drawing and annealing the copper monofilaments to obtain conductor wires, wherein the diameter of each conductor wire can be 0.1-5mm, for example 0.25mm, combining a plurality of conductor wires into a conductor bundle in a bundle twisting mode, wrapping insulating layers with uniform thickness on the surface of the conductor bundle, and configuring the number of the wound conductor wires according to actual requirements. The insulating layer material can be selected in the prior art, and can be made of polyethylene extrusion for example;

s12: and (3) winding and coating the product obtained in the step one by using a nylon material belt, wherein the nylon material belt is a commercially available nylon 66 material belt, so as to form an inner liner layer adhered to the outer side of the insulating layer, and obtain the core layer.

Step two: and (3) blending polyvinyl chloride, polyethylene, polyamide fiber, triethylhexyl phosphoric acid, hindered phenol antioxidant and termite-resistant agent with the weight shown in the table 2, heating to 165 ℃, stirring for 3 hours, extruding, and uniformly coating the mixture on the outer side of the core layer prepared in the step one to form a sheath, so as to obtain the termite-resistant cable.

Examples 2 to 11

A termite-proof cable is different from the termite-proof cable in example 1 in that in the second step, the raw materials and the weight of the raw materials in the sheath are shown in the table 2.

Example 12

A termite-proof cable, which is different from example 11 in that, in the second step, the heating temperature is 160 ℃ and the stirring time is 4 hours.

Example 13

A termite-proof cable, which is different from example 11 in that, in the second step, the heating temperature is 180 ℃ and the stirring time is 2 hours.

Comparative example

Comparative example 1

A cable, differing from example 11 in that no termite resistant agent was added.

Comparative example 2

A cable differing from example 11 in that the termite resistant agent does not contain the rosin extract.

Comparative example 3

A cable differing from example 11 in that the termite resistant agent did not contain bifenthrin.

Comparative example 4

A cable differing from example 11 in that the termite resistant agent did not contain capsaicin.

Comparative example 5

A cable differing from example 11 in that no polyamide fibres were present.

Comparative example 6

A cable was obtained as described in example 11, except that in the second step, the heating temperature was 220 ℃ and the stirring time was 2 hours.

TABLE 2

Performance test

Detection method/test method

1. And (3) testing tensile strength: tensile strength test tests were performed on the cables prepared in examples 1 to 13 and comparative examples 1 to 6 using the test method described in GB/T1040-2018.

2. And (3) elongation test: the cables obtained in examples 1 to 13 and comparative examples 1 to 6 were subjected to an elongation test using the test method described in GB/T1040-2018.

3. And (3) detecting the termite resistance: the cables prepared in examples 1-13 and comparative examples 1-6 were tested for termite resistance by a knock-down test using the wire and cable termite test method of GB/T2951.38-1986. The termite knock-down time KT50 is less than 350min, which indicates that the termite-proof performance is better.

4. And (3) detection of persistence: the cables prepared in examples 1 to 13 and comparative examples 1 to 6 were aged, and during the aging, the cables were aged by using an air box at 100 ℃ for 168 hours, and after the aging, the aged cables were allowed to stand at normal temperature and pressure for 16 hours, and then termite-proof performance was measured.

The above test data are shown in table 3.

TABLE 3

It can be seen from the combination of examples 1 to 13 and comparative example 1 and table 3 that the termite-resistant agent prepared from the rosin extract, bifenthrin and capsaicin has a good termite-resistant effect when added into the cable sheath, and has little influence on the mechanical properties of the cable.

It should be noted here that the termite knock-down time KT50 indicates the time taken for half of the termites to die, but in comparative example 1, there is no termite-proofing effect, so the termite knock-down time KT50 cannot be detected.

It can be seen from the combination of examples 1 to 13 and comparative example 2 and from table 3 that the addition of the rosin extract to the termite resistant agent can improve the termite resistance of the cable, indicating that the rosin extract can improve the termite resistance of the cable in cooperation with bifenthrin and capsaicin.

It can be seen from the combination of examples 1-13 and comparative example 3 and from table 3 that the termite resistance of the cable can be improved by adding bifenthrin to the termite resistant agent.

As can be seen by combining examples 1-13 and comparative example 4 with Table 3, the termite resistance of the cable can be improved after adding capsaicin to the termite resistant agent.

It can be seen from the combination of examples 1-13 and comparative example 5 and from Table 3 that the termite resistance of the cable can be improved by adding the polyamide fiber to the termite resistant agent, indicating that the polyamide fiber can improve the termite resistance of the cable in cooperation with the termite resistant agent.

It can be seen from the combination of examples 1 to 13 and comparative example 6 and from Table 3 that, when the raw materials of the extruded sheath are blended during the preparation of the cable, the temperature is too high, and the properties of the cable are affected to some extent, but not to a great extent.

As can be seen by combining examples 1-4 with table 3, when the weight ratio of rosin extract, bifenthrin to capsaicin is in the range of 1: (1.5-2.5): (1.5-2.5), the three are combined well, the cable prepared has better termite resistance.

As can be seen by combining examples 5, 6 and 11 with table 3, when the rosin extract obtained in preparation example 3 was used as the rosin extract, the termite resistance of the cable obtained was better.

It can be seen from the combination of examples 7, 8 and 11 and table 3 that when the modified capsaicin prepared in preparation example 6 is used as the capsaicin, the termite resistance of the prepared cable is better, the duration of the termite resistance is longer, and the replacement frequency of the cable in the actual production process can be reduced.

It can be seen from the combination of examples 9-11 and Table 3 that when the modified polyamide fiber obtained in preparation example 9 is used as the polyamide fiber, the termite resistance of the cable obtained is better.

In connection with examples 11-13 and in connection with table 3, it can be seen that the mixing temperature in step two has a certain effect when preparing the cable, which indicates that too high a temperature may affect the stability of some components in the cable.

It can be seen by combining examples 1-13 with table 3 that when the cable was prepared by the method of example 11, the resulting cable had better properties and longer duration of termite resistance.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. The termite-proof cable is characterized by comprising a core layer and a sheath, wherein the sheath is coated on the surface of the core layer and is prepared from the following raw materials in parts by weight:

60-75 parts of polyvinyl chloride;

20-30 parts of polyethylene;

10-18 parts of polyamide fiber;

2-4 parts of a dispersant;

1-4 parts of an antioxidant;

0.5-1.5 parts of termite-resistant agent;

2. The termite resistant cable set forth in claim 1 wherein: in the termite-resistant agent, the weight ratio range of the rosin extract, the bifenthrin and the capsaicin is 1: (1.5-2.5): (1.5-2.5).

3. A termite resistant cable in accordance with claim 1 or 2 wherein: the capsaicin is modified capsaicin and is prepared by the following method:

4. A termite resistant cable in accordance with claim 3 wherein: the polyamide fiber is modified polyamide fiber, and is prepared by the following method:

5. A termite resistant cable in accordance with claim 1 or 2 wherein: the dispersant is triethyl hexyl phosphoric acid.

6. A termite resistant cable in accordance with claim 1 or 2 wherein: the antioxidant is hindered phenol antioxidant.

7. The termite resistant cable set forth in claim 4 wherein: the sheath is prepared from the following raw materials in parts by weight:

65 parts of polyvinyl chloride;

25 parts of polyethylene;

15 parts of polyamide fiber;

3 parts of a dispersing agent;

2 parts of an antioxidant;

0.2 parts of rosin extract;

0.4 part of bifenthrin;

0.4 part of capsaicin.

8. A preparation method of a termite-proof cable is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: preparing a core layer;

step two: and (3) blending polyvinyl chloride, polyethylene, polyamide fiber, a dispersing agent, an antioxidant and a termite-resistant agent, heating to 160-180 ℃, stirring for 2-4h, extruding, and coating the outside of the core layer prepared in the step one to obtain the termite-resistant cable.

9. The termite resistant cable set forth in claim 8 wherein: the first step comprises the following steps:

s12: and (4) winding and wrapping the product obtained in the step one by using a nylon material belt to form an inner liner layer attached to the outer side of the insulating layer, and forming a sheath to obtain the core layer.