Seawater-resistant line material and preparation method thereof

Abstract

The invention relates to the field of modified polyvinyl chloride materials, in particular to a seawater-resistant line material and a preparation method thereof. The seawater-resistant wire material comprises the following components in parts by weight: 100 parts of PVC, 40-55 parts of adipic acid polyester, 20-30 parts of calcium carbonate, 3-4 parts of ESO, 4-6 parts of a composite calcium-zinc stabilizer, 0.3-0.5 part of fatty acid pentaerythritol ester and 15-25 parts of nitrile rubber. Through polymer characteristics of adipic acid polyester and nitrile rubber, the flexibility of the line material is improved while seawater corrosion is resisted, so that the performance of high elongation at break of the seawater-resistant line material in a seaside environment is ensured.

Description

Technical Field

[0001] The present application relates to the field of modified polyvinyl chloride materials, and in particular to a seawater-resistant thread material and a preparation method thereof. Background Art

[0002] Wires are common industrial products, and polyvinyl chloride has become the main component of wire materials due to its excellent weather resistance and resistance to electrical breakdown.

[0003] In actual use, wires in seaside environments are more likely to crack than those in inland areas, which affects the overall service life of the wires. The reason is that the humidity in the seaside environment is high and there is a lot of salt spray. PVC materials easily absorb moisture in high humidity environments, resulting in an increase in the moisture content inside the material, thereby accelerating the dissolution and diffusion of certain components in PVC and destroying the stability of its chemical structure. At the same time, the salt in the salt spray may also corrode the PVC material, further accelerating the aging process.

[0004] Therefore, it is necessary to modify PVC and prepare a seawater-resistant wire material that can be used for a long time at the seaside to increase the service life of the wire. Summary of the invention

[0005] In order to prepare seawater-resistant wire materials for long-term use of electric wires at the seaside, the present application provides a seawater-resistant wire material, which improves the flexibility of the wire material while resisting seawater erosion through the polymer properties of adipic acid polyester and nitrile rubber itself, thereby ensuring the high elongation at break performance of the seawater-resistant wire material in the seaside environment.

[0006] In the first aspect, the present application provides a seawater resistant thread material, which adopts the following technical solution: A seawater resistant thread material comprises the following components in parts by weight: 100 parts of PVC, 40-55 parts of adipic acid polyester, 20-30 parts of calcium carbonate, 3-4 parts of ESO, 4-6 parts of composite calcium zinc stabilizer, 0.3-0.5 parts of fatty acid pentaerythritol ester, and 15-25 parts of nitrile rubber.

[0007] By adopting the above technical scheme, adipic acid polyester plays the role of plasticizer and modifier in this application. Adipic acid polyester is a polyester material with good corrosion resistance and weather resistance. Adding adipic acid polyester to seawater-resistant thread material can improve the overall corrosion resistance of the thread material, and can effectively resist the erosion of corrosive substances such as salt and chloride ions in seawater. At the same time, the addition of adipic acid polyester can also improve the processing performance and mechanical properties of the thread material, and can increase the flexibility of PVC, so that the thread material can have a higher elongation at break while maintaining strength.

[0008] Nitrile rubber is a polymer material with excellent physical and chemical properties, such as good heat resistance, strong oil resistance, good weather resistance, strong acid and alkali resistance, and good aging resistance. These properties enable nitrile rubber to effectively resist seawater erosion and oxidation, thereby extending the service life of the material. In the seaside environment, the addition of nitrile rubber can significantly improve the flexibility, elasticity and tensile resistance of the wire material, thereby enhancing the crack resistance.

[0009] The present application utilizes the polymer properties of adipic acid polyester and nitrile rubber to improve the flexibility of the thread material while resisting seawater erosion, thereby ensuring the high elongation at break performance of the seawater-resistant thread material in a seaside environment.

[0010] Preferably, the weight portion of the adipic acid polyester is 43-50 parts.

[0011] By adopting the above technical solution, adipic acid polyester can be used as a plasticizer and modifier to increase the flexibility of PVC, so that the strand can withstand greater deformation without breaking when stretched. If the content is too low, the flexibility of the strand will decrease, and the elongation at break will also decrease accordingly, thereby affecting the seawater resistance and long-term reliability of the strand.

[0012] Adipic acid polyester has good hydrolysis resistance and chemical corrosion resistance, and can effectively resist the corrosion of corrosive substances such as salt and chloride ions in seawater. Too low a content will result in insufficient chemical corrosion resistance of the strand, and it is easy to degrade and age in seawater.

[0013] When the content is high, the performance of the seawater resistant yarn is difficult to continue to increase. For production cost considerations, there is no need to continue to increase the content of adipic acid polyester.

[0014] Preferably, the seawater resistant line material further comprises phosphite compounds and / or organic acid metal soap compounds, wherein the phosphite compounds comprise at least one of triethyl phosphite and triphenyl phosphite; and the organic acid metal soap compounds comprise at least one of lead oleate and lead phthalate.

[0015] Preferably, the seawater-resistant line material further comprises the phosphite compound and the organic acid metal soap compound.

[0016] By adopting the above technical solution, phosphite compounds, such as triethyl phosphite and triphenyl phosphite, are effective antioxidants and light stabilizers. They can capture free radicals and inhibit the aging process of polymer materials, thereby extending the service life of the wire material. At the same time, phosphite compounds can also absorb ultraviolet rays, avoid their influence on polymer materials, and protect the surface of the substrate from damage by ultraviolet rays.

[0017] Organic acid metal soap compounds, such as lead oleate and lead phthalate, have excellent corrosion resistance. They can form a protective film on the metal surface to prevent the corrosive substances in seawater from corroding the PVC substrate. These compounds can also react with unstable groups in PVC molecules to reduce the occurrence of degradation reactions, thereby improving the stability of the strands.

[0018] Phosphite compounds can form complexes with metal ions in organic acid metal soap compounds, thereby further enhancing the stability of the strands. The synergistic effect between phosphite compounds and organic acid metal soap compounds can further improve the overall performance of the strands. This complex reaction can effectively inhibit the catalytic degradation of metal ions on PVC molecules, and improve the seawater resistance and long-term reliability of the strands.

[0019] Preferably, the weight portion of the phosphite compound is 1-2 parts, and the weight portion of the organic acid metal soap compound is 1-3 parts.

[0020] By adopting the above technical solution, phosphite compounds play a key role in the formulation as auxiliary antioxidants and chelating agents. If the addition amount is too low, it may not be able to fully exert its performance, resulting in difficulty in effectively improving the seawater resistance and stability of the strands.

[0021] Organic acid metal soap compounds mainly contribute to corrosion resistance and stability. If the addition amount is too low, an effective protective film may not be formed, making it difficult to further improve the ability of the wire material to resist corrosion in seawater.

[0022] Preferably, the seawater-resistant line material further comprises a thioester compound and / or an organic tin compound, wherein the thioester compound comprises at least one of ethyl thioacetate and furfuryl thioformate; and the organic tin compound comprises at least one of stannous octoate and tetraphenyltin.

[0023] Preferably, the seawater-resistant thread material further comprises the thioester compound and the organotin compound.

[0024] By adopting the above technical scheme, thioester compounds, such as ethyl thioacetate and furfuryl thioformate, have excellent antioxidant properties. They can capture free radicals generated by polymers during thermal oxidative aging, thereby interrupting the free radical chain reaction and preventing the breakage and degradation of polymer molecular chains. In addition, thioester compounds can remain stable at high temperatures, preventing the performance of polymers from degrading due to thermal degradation.

[0025] Organotin compounds, such as stannous octoate and tetraphenyltin, act as heat stabilizers and can react with unstable groups in polymer molecules to form stable chemical bonds. These chemical bonds can resist the destructive effects of heat, light, oxygen and other factors on polymer molecules, thereby improving the thermal stability of polymers. At the same time, organotin compounds can also promote cross-linking reactions between polymer molecular chains to form a more compact network structure, further enhancing the heat resistance of polymers.

[0026] Both thioesters and organotin compounds can capture free radicals, but their mechanisms of action may be different. Thioesters capture free radicals primarily through the sulfur atoms in their molecules, while organotin compounds may capture free radicals indirectly by reacting with unstable groups in polymer molecules. This synergistic effect can more effectively interrupt the free radical chain reaction and prevent polymer degradation.

[0027] Organotin compounds can react with unstable groups in polymer molecules to form stable chemical bonds. These chemical bonds can resist the destructive effects of factors such as heat, light, and oxygen. The presence of thioester compounds may help form such stable chemical bonds because thioester compounds can stabilize polymer molecular chains and reduce the number of unstable groups, thereby providing more reaction sites for organotin compounds.

[0028] Organotin compounds can promote the cross-linking reaction between polymer molecular chains to form a more compact network structure. The presence of thioester compounds may help this cross-linking reaction because thioester compounds can stabilize polymer molecular chains and prevent them from breaking during the cross-linking process.

[0029] Preferably, the weight portion of the thioester compound is 0.5-1.5 parts, and the weight portion of the organotin compound is 1-2 parts.

[0030] By adopting the above technical solution, the thioester compound is used as an antioxidant, and its addition amount needs to be sufficient to ensure that it can effectively capture the free radicals generated by the polymer during the thermal oxidative aging process. If the addition amount is too low, its antioxidant performance may not be fully exerted, resulting in a decrease in the thermal oxidative aging resistance of the polymer and difficulty in improving the seawater resistance of the strand.

[0031] As a heat stabilizer, the amount of organotin compounds added needs to be sufficient to ensure that they can effectively react with unstable groups in polymer molecules to form stable chemical bonds. If the amount added is too low, it may not provide sufficient thermal stability and it will be difficult to improve the seawater resistance of the strand.

[0032] In a second aspect, the present application provides a method for preparing a seawater-resistant thread material, using the following technical solution: A method for preparing a seawater resistant thread material, used for preparing the seawater resistant thread material, comprises the following steps: Medium-speed mixing: mixing the other materials except adipic acid polyester and nitrile rubber at a medium speed to 75-85° C. to obtain an initial mixture, wherein the stirring speed of the medium-speed mixing is 2900-3100 rpm; High-speed mixing: adding the formulated amount of adipic acid polyester to the preliminary mixture and mixing at high speed to 145-155° C. to obtain a high-temperature mixture, wherein the stirring speed of the high-speed mixing is 4800-5000 rpm; Cooling and mixing: the high-temperature mixture is cooled and mixed at a low speed to 55-65° C., a formulated amount of nitrile rubber is added, and then the low-speed cooling and mixing is continued to be performed to 35-45° C. to obtain a final mixture, wherein the stirring speed of the low-speed cooling and mixing is 20-40 rpm; extrusion granulation: the final mixture is extruded and granulated to obtain a seawater-resistant strand material.

[0033] By adopting the above technical solution, the temperature of the medium-speed mixing stage is controlled within the range of 75-85°C, mainly to ensure the initial mixing and dispersion of the components. The appropriate temperature can promote the interaction between the components and improve the mixing efficiency. The temperature of the high-speed mixing stage is controlled within the range of 145-155°C to ensure the full mixing and uniform distribution between the adipic acid polyester and other components. High temperature helps to accelerate the fusion and reaction of the components.

[0034] The temperature in the cooling mixing stage is reduced from 55-65°C to 35-45°C, mainly to reduce the temperature of the mixture, prevent degradation caused by overheating, and promote the fusion of nitrile rubber and other components.

[0035] The control of the temperature range during the preparation of seawater resistant strands has an important impact on the performance of the final product. By accurately controlling the temperature range of each stage, it is possible to ensure full mixing and uniform distribution of the components, avoid degradation or failure of the components, and thus improve the mechanical properties, thermal stability and seawater resistance of the final product.

[0036] Preferably, the method for preparing the seawater resistant strand material further comprises preheating the formulated amount of adipic acid polyester to 75-85° C., and then adding the preheated adipic acid polyester to the initial mixture for high-speed mixing.

[0037] By adopting the above technical solution, preheating the adipic acid polyester can make its temperature close to the temperature of the initial mixture, thereby reducing the temperature difference between the two. This helps to achieve a uniformly mixed state more quickly during high-speed mixing and improve mixing efficiency. The melting point of adipic acid polyester is relatively high, and preheating can make it easier to melt. In the molten state, adipic acid polyester is more likely to interact and disperse with other components. This helps to ensure uniform distribution of adipic acid polyester in the mixture and avoid the occurrence of local concentrations that are too high or too low.

[0038] In summary, this application has the following beneficial effects: 1. Due to the polymer properties of adipic acid polyester and nitrile rubber, the present application improves the flexibility of the thread material while resisting seawater erosion, thereby ensuring the high elongation at break performance of the seawater-resistant thread material in the seaside environment; 2. The present application further enhances the stability of the strands by forming complexes with metal ions in organic acid metal soap compounds through phosphite compounds; this complex reaction can effectively inhibit the catalytic degradation of metal ions on PVC molecules, thereby improving the seawater resistance and long-term reliability of the strands; 3. The present application can more effectively interrupt the free radical chain reaction and prevent polymer degradation through the synergistic effect of the phosphite compounds and the organic acid metal soap compounds; the thioester compounds can stabilize the polymer molecular chains and reduce the number of unstable groups, thereby providing more reaction sites for the organic tin compounds. DETAILED DESCRIPTION

[0039] The raw materials in this application include the following parts: PVC: polyvinyl chloride, using a commercial product with CAS number 9002-86-2; Adipic acid polyester: any commercially available product may be used. This application uses a commercially available product of model UN610 produced by Dongguan Huazhiyuan Chemical Co., Ltd. as an example for illustration; Calcium carbonate: a commercially available product with CAS No. 471-34-1; ESO: epoxidized soybean oil, a commercial product with CAS number 8013-07-8; Composite calcium zinc stabilizer: any commercially available product can be used. This application uses a commercially available product with a brand number of 91660 from Baerlocher, Germany, as an example; Pentaerythritol fatty acid ester: a commercial product with CAS number 68424-31-7; Nitrile rubber: a commercial product with CAS number 9003-18-3; Triethyl phosphite: a commercially available product with CAS number 122-52-1; Triphenyl phosphite: a commercially available product with CAS number 101-02-0; Lead oleate: a commercially available product with CAS number 1120-46-3; Lead phthalate: a commercially available product with CAS number 69011-06-9; Thioethyl acetate: a commercially available product with CAS number 625-60-5; Furfuryl thioformate: a commercially available product with CAS number 59020-90-5 is used; Stannous octoate: a commercially available product with CAS number 301-10-0; Tetraphenyltin: a commercially available product with CAS number 595-90-4; The present application is further described in detail below in conjunction with embodiments and comparative examples.

[0040] Example 1 A method for preparing a seawater resistant thread material comprises the following steps: Medium-speed mixing: 10 kg of PVC, 2.5 kg of calcium carbonate, 0.35 kg of ESO, 0.5 kg of composite calcium-zinc stabilizer, and 0.04 kg of fatty acid pentaerythritol ester are mixed at medium speed to 80°C to obtain an initial mixture. The stirring speed of the medium-speed mixing is 3000 rpm (2900-3100 rpm is acceptable); High-speed mixing: 5 kg of adipic acid polyester is added to the initial mixture and mixed at high speed to 150° C. to obtain a high-temperature mixture. The stirring speed of the high-speed mixing is 5000 rpm (4800-5000 rpm is acceptable); Cooling and mixing: the high-temperature mixture is cooled and mixed at a low speed to 60° C., 2 kg of nitrile rubber is added, and then the mixture is cooled and mixed at a low speed to 40° C. to obtain a final mixture. The stirring speed of the slow cooling and mixing is 30 rpm (20-40 rpm is possible); Extrusion granulation: the final mixture is extruded and granulated to obtain a seawater-resistant strand material.

[0041] Example 2-3 Example 2-3 Based on the preparation method of Example 1, the content of each component of the seawater resistant line material is adjusted, and the specific adjustment is shown in Table 1.

[0042] Comparative Example 1-2 Comparative Example 1 does not add 5 kg of adipic acid polyester, and other conditions remain unchanged.

[0043] Comparative Example 2 is to replace 5 kg of adipic acid polyester with 5 kg of ESO, while other conditions remain unchanged.

[0044] Table 1 Content of each component of seawater resistant thread material of Examples 1-3 and performance test table of Comparative Examples 1-2 project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 PVC / kg 10 10 10 10 10 Adipic acid polyester / kg 5 4 5.5 / / Calcium carbonate / kg 2.5 2 3 2.5 2.5 ESO / kg 0.35 0.3 0.4 0.35 5.35 Composite calcium zinc stabilizer / kg 0.5 0.4 0.6 0.5 0.5 Pentaerythritol fatty acid ester / kg 0.04 0.03 0.05 0.04 0.04 Nitrile rubber / kg 2 1.5 2.5 2 2 Elongation at break / % 386 370 386 282 306 Elongation at break after aging / % 357 316 358 147 187 Residual elongation at break / % 92.5 85.4 92.7 52.1 61.1 Performance testing The following performance tests were performed on Examples 1-3 and Comparative Examples 1-2. The test results are shown in Table 1.

[0045] 1. Elongation at break The seawater resistant strands were made into samples according to GB / T 1040-2006 “Determination of tensile properties of plastics Part 2: Test conditions for molded and extruded plastics” to determine the elongation at break.

[0046] 2. Aging test The seawater-resistant strands were made into samples according to GB / T 1040-2006 "Determination of tensile properties of plastics Part 2: Test conditions for molded and extruded plastics" and immersed in 80°C offshore seawater for 14 days, and the elongation at break after aging was measured. The residual elongation at break was calculated as (elongation at break after aging / elongation at break)*100%.

[0047] Referring to Table 1, by comparing Examples 1-3 and Comparative Examples 1-2, it can be seen that the elongation at break and the residual elongation at break of Examples 1-3 are much greater than those of Comparative Examples 1-2, indicating that the addition of adipic acid polyester can effectively improve the toughness and seawater corrosion resistance of the strand, thereby improving the elongation at break and the residual elongation at break.

[0048] Among them, the performance of Example 3 is basically equivalent to that of Example 1, but the raw material content of Example 3 is higher than that of Example 1. Comprehensively compared, Example 1 is preferred.

[0049] Embodiment 4-6 In Example 4-6, based on the preparation method of Example 1, the addition amount of adipic acid polyester was adjusted, and the specific adjustment is shown in Table 2.

[0050] The seawater resistant thread materials of Examples 4-6 were subjected to the above performance tests, and the test results are shown in Table 2.

[0051] Table 2 Addition amount and performance test table of adipic acid polyester of Example 1 and Examples 4-6 project Example 1 Example 4 Example 5 Example 6 Adipic acid polyester / g 5 43 48 53 Elongation at break / % 386 375 382 386 Elongation at break after aging / % 357 332 345 358 Residual elongation at break / % 92.5 88.5 90.3 92.7 Referring to Table 2, it can be seen from the comparison between Example 1 and Examples 4-6 that when the amount of adipic acid polyester added increases continuously, the elongation at break and the residual elongation at break both show a trend of increasing continuously and then tending to be stable. This may be because when the amount of adipic acid polyester added increases continuously, the adipic acid polyester, as a plasticizer and modifier, can increase the flexibility of PVC, so that the wire material can withstand greater deformation without breaking during stretching, thereby improving the elongation at break; adipic acid polyester has good hydrolysis resistance and chemical corrosion resistance, and can effectively resist the erosion of corrosive substances such as salt and chloride ions in seawater, thereby improving the residual elongation at break.

[0052] Embodiment 7-14 Example 7 Based on the preparation method of Example 1, 0.2 kg of triethyl phosphite and PVC and other materials are mixed together at a medium speed, and the other conditions remain unchanged.

[0053] Example 8 Based on the preparation method of Example 1, 0.2 kg of triphenyl phosphite and PVC and other materials are mixed together at medium speed, and other conditions remain unchanged.

[0054] Example 9 Based on the preparation method of Example 1, 0.3 kg of lead oleate and PVC and other materials are mixed together at a medium speed, and the other conditions remain unchanged.

[0055] Example 10 Based on the preparation method of Example 1, 0.3 kg of lead phthalate and PVC and other materials are mixed together at a medium speed, and the other conditions remain unchanged.

[0056] Example 11 Based on the preparation method of Example 1, 0.1 kg of triethyl phosphite and 0.1 kg of lead oleate are mixed as composition 1 with PVC and other materials at a medium speed, and other conditions remain unchanged.

[0057] Example 12 Based on the preparation method of Example 1, 0.1 kg of triphenyl phosphite and 0.1 kg of lead phthalate are mixed as composition 2 with PVC and other materials at a medium speed, and other conditions remain unchanged.

[0058] Example 13 Based on the preparation method of Example 1, 0.1 kg of triethyl phosphite and 0.2 kg of lead phthalate are mixed as composition 3 with PVC and other materials at a medium speed, and other conditions remain unchanged.

[0059] Example 14 Based on the preparation method of Example 1, 0.15 kg of triphenyl phosphite and 0.15 kg of lead oleate are mixed as composition 4 with PVC and other materials at a medium speed, and other conditions remain unchanged.

[0060] The seawater resistant yarn materials of Examples 7-14 were subjected to the above performance tests, and the test results are shown in Tables 3 and 4.

[0061] Table 3 Performance test table of Example 1 and Examples 7-10 Table 4 Composition types and performance test table of Example 1 and Examples 11-14 project Example 1 Embodiment 11 Example 12 Example 13 Embodiment 14 Composition Type / Composition 1 Composition 2 Composition 3 Composition 4 Elongation at break / % 386 402 403 407 410 Elongation at break after aging / % 357 381 383 392 396 Residual elongation at break / % 92.5 94.8 95.0 96.3 96.6 Referring to Table 3 and Table 4, it can be seen from the comparison between Example 1 and Examples 11-14 that the addition of phosphite compounds and / or the organic acid metal soap compounds can improve the elongation at break and the residual elongation at break of the seawater-resistant thread material. Because phosphite compounds can capture free radicals and inhibit the aging process of polymer materials, the service life of the thread material is extended. Organic acid metal soap compounds can form a protective film on the metal surface to prevent corrosive substances in seawater from corroding the PVC substrate. Organic acid metal soap compounds can also react with unstable groups in PVC molecules to reduce the occurrence of degradation reactions, thereby improving the stability of the thread material.

[0062] When the phosphite compound and the organic acid metal soap compound are used in combination, the elongation at break and the residual elongation at break of the seawater resistant strand can be further improved. This is because the phosphite compound can form a complex with the metal ions in the organic acid metal soap compound, thereby further enhancing the stability of the strand. This complex reaction can effectively inhibit the catalytic degradation of metal ions on PVC molecules, thereby improving the seawater resistance and long-term use reliability of the strand.

[0063] Examples 15-22 Example 15 Based on the preparation method of Example 1, 0.15 kg of ethyl thioacetate and PVC and other materials are mixed together at medium speed, and the other conditions remain unchanged.

[0064] Example 16 Based on the preparation method of Example 1, 0.15 kg of furfuryl thioformate and PVC and other materials are mixed together at medium speed, and the other conditions remain unchanged.

[0065] Example 17 Based on the preparation method of Example 1, 0.2 kg of stannous octoate and PVC and other materials are mixed together at medium speed, and other conditions remain unchanged.

[0066] Example 18 Based on the preparation method of Example 1, 0.2 kg of tetraphenyltin and PVC and other materials are mixed together at medium speed, and other conditions remain unchanged.

[0067] Example 19 Based on the preparation method of Example 1, 0.05 kg of ethyl thioacetate and 0.1 kg of stannous octoate are mixed as composition 5 with PVC and other materials at a medium speed, and other conditions remain unchanged.

[0068] Example 20 Based on the preparation method of Example 1, 0.05 kg of furfuryl thioformate and 0.1 kg of tetraphenyltin are mixed as composition 6 with PVC and other materials at a medium speed, and the other conditions remain unchanged.

[0069] Example 21 Based on the preparation method of Example 1, 0.05 kg of ethyl thioacetate and 0.15 kg of tetraphenyltin are mixed as composition 7 with PVC and other materials at a medium speed, and the other conditions remain unchanged.

[0070] Example 22 Based on the preparation method of Example 1, 0.1 kg of furfuryl thioformate and 0.1 kg of stannous octoate are mixed as composition 8 with PVC and other materials at medium speed, and other conditions remain unchanged.

[0071] The seawater resistant yarn materials of Examples 15-22 were subjected to the above performance tests, and the test results are shown in Tables 5 and 6.

[0072] Table 5 Performance test table of Example 1 and Examples 15-18 Table 6 Composition types and performance test table of Example 1 and Examples 19-22 project Example 1 Embodiment 19 Embodiment 20 Embodiment 21 Embodiment 22 Composition Type / Composition 5 Composition 6 Composition 7 Composition 8 Elongation at break / % 386 405 406 410 411 Elongation at break after aging / % 357 386 388 395 398 Residual elongation at break / % 92.5 95.3 95.6 96.3 96.8 Referring to Table 5 and Table 6, it can be seen from the comparison between Example 1 and Examples 15-22 that the elongation at break and the residual elongation at break of the seawater-resistant thread material can be improved by adding thioester compounds and / or organotin compounds. This is because thioester compounds can capture free radicals generated by polymers during the thermal oxidative aging process, thereby interrupting the free radical chain reaction and preventing the breakage and degradation of polymer molecular chains. In addition, thioester compounds can also remain stable at high temperatures, preventing the polymer from degrading due to thermal degradation.

[0073] Organotin compounds can react with unstable groups in polymer molecules to form stable chemical bonds. These chemical bonds can resist the destructive effects of heat, light, oxygen and other factors on polymer molecules, thereby improving the thermal stability of polymers. At the same time, organotin compounds can also promote cross-linking reactions between polymer molecular chains to form a tighter network structure, further enhancing the heat resistance of polymers.

[0074] When phosphite compounds and the organic acid metal soap compounds are used in combination, the elongation at break and the residual elongation at break of the seawater resistant line material can be further improved. Because both thioester compounds and organotin compounds can capture free radicals, but their mechanisms of action may be different. This synergistic effect can more effectively interrupt the free radical chain reaction and prevent polymer degradation. Organotin compounds can react with unstable groups in polymer molecules to form stable chemical bonds. The presence of thioester compounds may contribute to the formation of this stable chemical bond, because thioester compounds can stabilize polymer molecular chains and reduce the number of unstable groups, thereby providing more reaction sites for organotin compounds.

[0075] Examples 23-27 Example 23 is based on the preparation method of Example 1, the medium speed mixing is adjusted to 75°C to obtain an initial mixture, the high speed mixing is adjusted to 145°C to obtain a high-temperature mixture, the low speed cooling mixing is adjusted to 55°C when 2kg of nitrile rubber is added, and the low speed cooling mixing is continued to adjust to 35°C to obtain the final mixture, and the other conditions remain unchanged.

[0076] Example 24 is based on the preparation method of Example 1, the medium speed mixing is adjusted to 85°C to obtain an initial mixture, the high speed mixing is adjusted to 155°C to obtain a high-temperature mixture, 2 kg of nitrile rubber is added when the low speed cooling mixing is adjusted to 65°C, and the low speed cooling mixing is continued to adjust to 45°C to obtain the final mixture, and the other conditions remain unchanged.

[0077] Example 25 Based on the preparation method of Example 1, 5 kg of adipic acid polyester is preheated to 80°C and then added to the initial mixture for high-speed mixing, while other conditions remain unchanged.

[0078] Example 26 Based on the preparation method of Example 1, 5 kg of adipic acid polyester is preheated to 75°C and then added to the initial mixture for high-speed mixing, while other conditions remain unchanged.

[0079] Example 27 Based on the preparation method of Example 1, 5 kg of adipic acid polyester is preheated to 85° C. and then added to the initial mixture for high-speed mixing, while other conditions remain unchanged.

[0080] The seawater resistant thread materials of Examples 23-27 were subjected to the above performance tests, and the test results are shown in Table 7 respectively.

[0081] Table 7 Performance test table of Example 1 and Examples 23-27 Referring to Table 7, by comparing Example 1 with Examples 23-27, it can be seen that the temperature of the medium-speed mixing stage is controlled within the range of 75-85°C, the temperature of the high-speed mixing stage is controlled within the range of 145-155°C, and the temperature of the cooling mixing stage is reduced from 55-65°C to 35-45°C. Within the above temperature range, the present application can be implemented.

[0082] Preheat the adipic acid polyester to 75-85°C, close to the temperature of the initial mixture, thereby reducing the temperature difference between the two. This helps to achieve a uniform mixing state faster during high-speed mixing and improves mixing efficiency. The melting point of adipic acid polyester is relatively high, and preheating can make it melt more easily. In the molten state, adipic acid polyester is more likely to interact and disperse with other components. This helps to ensure the uniform distribution of adipic acid polyester in the mixture and avoid the occurrence of local concentrations that are too high or too low, thereby slightly improving the elongation at break and the residual elongation at break of the seawater-resistant strands.

[0083] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A seawater resistant thread material, characterized in that: The invention comprises the following components in parts by weight: 100 parts of PVC, 40-55 parts of adipic acid polyester, 20-30 parts of calcium carbonate, 3-4 parts of ESO, 4-6 parts of composite calcium zinc stabilizer, 0.3-0.5 parts of pentaerythritol fatty acid ester and 15-25 parts of nitrile rubber.

2. The seawater resistant thread material according to claim 1, characterized in that: The weight portion of the adipic acid polyester is 43-50 parts.

3. The seawater resistant thread material according to claim 1, characterized in that: It also includes phosphite compounds and / or organic acid metal soap compounds, wherein the phosphite compounds include at least one of triethyl phosphite and triphenyl phosphite; and the organic acid metal soap compounds include at least one of lead oleate and lead phthalate.

4. The seawater resistant thread material according to claim 3, characterized in that: It also includes the phosphite compound and the organic acid metal soap compound.

5. The seawater resistant thread material according to claim 3, characterized in that: The weight portion of the phosphite compound is 1-2 parts, and the weight portion of the organic acid metal soap compound is 1-3 parts.

6. The seawater resistant thread material according to claim 1, characterized in that: It also includes thioester compounds and / or organic tin compounds, wherein the thioester compounds include at least one of ethyl thioacetate and furfuryl thioformate; and the organic tin compounds include at least one of stannous octoate and tetraphenyltin.

7. The seawater resistant thread material according to claim 6, characterized in that: Also included are the thioester compound and the organic tin compound.

8. The seawater resistant thread material according to claim 6, characterized in that: The weight portion of the thioester compound is 0.5-1.5 parts, and the weight portion of the organotin compound is 1-2 parts.

9. The method for preparing the seawater resistant thread material according to any one of claims 1 to 8, characterized in that: The following steps are involved: Medium-speed mixing: mixing the other materials except adipic acid polyester and nitrile rubber at a medium speed to 75-85° C. to obtain an initial mixture, wherein the stirring speed of the medium-speed mixing is 2900-3100 rpm; High-speed mixing: adding the formulated amount of adipic acid polyester to the preliminary mixture and mixing at high speed to 145-155° C. to obtain a high-temperature mixture, wherein the stirring speed of the high-speed mixing is 4800-5000 rpm; Cooling and mixing: The high-temperature mixture is cooled and mixed at a low speed to 55-65° C., a formulated amount of nitrile rubber is added, and then the mixture is cooled and mixed at a low speed to 35-45° C. to obtain a final mixture, wherein the stirring speed of the low-speed cooling and mixing is 20-40 rpm; Extrusion granulation: The final mixture is extruded and granulated to obtain seawater resistant strands.

10. The method for preparing seawater resistant thread material according to claim 9, characterized in that: The method also includes preheating the formulated amount of adipic acid polyester to 75-85° C., and then adding the preheated amount of adipic acid polyester into the initial mixture for high-speed mixing.

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