A special decomposing environment-friendly alkali-resistant cable sheath and a preparation method thereof

Abstract

This invention relates to the field of cable sheath technology, and in particular to a specific decomposition environmentally friendly alkali-resistant cable sheath and its preparation method. The specific decomposition environmentally friendly alkali-resistant cable sheath comprises 60-65 parts of polyacetal glycol, 15-20 parts of 1,4-butanediol benzoaldehyde, 12-15 parts of 4,4'-diphenylmethane diisocyanate, 3-5 parts of 1,4-butanediol, 2-3 parts of octadecyl isocyanate, 1-2 parts of perfluorohexylethyl isocyanate, and 0.05-0.1 parts of an organic bismuth catalyst. A pH-responsive sheath material is obtained through polycondensation and chain extension. Cable sheaths made from this material can withstand highly alkaline environments and are suitable for power network installation in highly alkaline environments such as saline-alkali land. This cable sheath has excellent environmental performance and can be treated by acid immersion and biodegradation, thus possessing practical value.

Description

Technical Field

[0001] This invention relates to the field of cable sheath technology, and in particular to a specific decomposition environmentally friendly alkali-resistant cable sheath and its preparation method. Background Technology

[0002] Saline-alkali soils contain a large amount of soluble salts, and under dry conditions, the pH is weakly alkaline. In rainy or snowy weather, the salts hydrolyze, further increasing the alkalinity (pH can rise to above 8.5). Therefore, conventional cable sheaths are generally not suitable for saline-alkali soil environments.

[0003] To improve salt and alkali resistance, the industry has made improvements. For example, Chinese patent 202311702555.6 discloses a sheath material for salt and alkali resistant drag cables, its preparation method, and the cable. The patent describes the sheath material formula, by weight, as follows: 40-45 parts chlorinated polyethylene, 1.5-2.0 parts dicumyl peroxide vulcanizing agent, 2-2.5 parts triisocyanate vulcanizing agent, 0.1-0.3 parts ethylene thiourea accelerator, 0.05-0.15 parts antioxidant RD, 4-5 parts metal oxide, 1-1.5 parts paraffin wax, 8-10 parts calcium carbonate, 15-21 parts reinforcing agent, 1-1.5 parts lead stearate, 0.5-1 part tribasic lead sulfate, 1-1.5 parts ultraviolet absorber, 3-5 parts epoxidized soybean oil, 8-9 parts chlorinated paraffin wax, and 3-4 parts antimony trioxide. This cable has advantages such as UV protection, no salt buildup, waterproofing, tensile strength, and cold resistance. It can be used for a long time in special operating environments, with a service life of at least 3 years, avoiding frequent cable replacements for users.

[0004] The disadvantages of the existing technology are: it contains toxic heavy metal components (lead stearate, lead tribasic sulfate, etc.); in addition, the cable sheath is difficult to degrade and is not environmentally friendly. Summary of the Invention

[0005] To address the shortcomings of existing technologies, one objective of this invention is to provide a method for preparing a specific decomposition environmentally friendly alkali-resistant cable sheath; another objective is to provide a method for degrading a specific decomposition environmentally friendly alkali-resistant cable sheath; and a third objective is to provide a method for degrading a specific decomposition environmentally friendly alkali-resistant cable sheath.

[0006] One of the objectives of this invention is achieved through the following technical solution: A specific decomposition environmentally friendly alkali-resistant cable sheath is prepared from the following raw materials in parts by weight: The mixture contains 60-65 parts of polyacetal diol, 15-20 parts of 1,4-butanediol benzoaldehyde, 12-15 parts of 4,4'-diphenylmethane diisocyanate, 3-5 parts of 1,4-butanediol, 2-3 parts of octadecyl isocyanate, 1-2 parts of perfluorohexylethyl isocyanate, and 0.05-0.1 parts of organic bismuth catalyst.

[0007] Furthermore, the raw material also includes functional additives, which are obtained by mixing the following components in parts by weight: Antioxidant 1010 0.3-0.5 parts, UV absorber UV-327 0.2-0.4 parts, carbon black N330 2-3 parts, calcium stearate 0.5-1 parts, and hydrophobic nano silica 1-2 parts.

[0008] The second objective of this invention is achieved through the following technical solution: A method for preparing a specific decomposition environmentally friendly alkali-resistant cable sheath includes the following steps: Step 1: Weigh out polyacetal glycol, 1,4-butanediol acetal, 4,4'-diphenylmethane diisocyanate, octadecyl isocyanate, perfluorohexyl ethyl isocyanate, and organic bismuth catalyst. Step 2: Add the above raw materials to the reactor and react at 80-85℃ for 2-3 hours to obtain the prepolymer; Step 3: Weigh 1,4-butanediol as a chain extender, add 1,4-butanediol to the prepolymer to carry out the chain extension reaction, the reaction temperature is 90-95℃, the reaction time is 1-2h, and the main chain is obtained. Step 4: Weigh out antioxidant 1010, ultraviolet absorber UV-327, carbon black N330, calcium stearate and hydrophobic nano silica, mix them as functional additives. Step 5: Add the functional additives to the main chain, stir thoroughly, and keep at 110℃ for 4 hours to complete the curing process, thus obtaining the sheath material; Step six: The sheath material is extruded and wrapped around the cable core to obtain a specific decomposition environmentally friendly alkali-resistant cable sheath.

[0009] Furthermore, the method for thorough stirring in step five is as follows: stir at a speed of 100-150 r / min for 5-10 min.

[0010] The third objective of this invention is achieved through the following technical solution: A method for specifically degrading environmentally friendly alkali-resistant cable sheaths includes the following steps: S1, strip the cable sheath from the core wire; S2, breaks the cable sheath; S3, Soak the cable sheath in acetic acid solution for 24-48 hours, then remove the cable sheath and drain. S4. Immerse the cable sheath in the bacterial solution at a temperature of 30-35℃ and aerate for 30-60 days to complete the degradation.

[0011] Furthermore, in step S2, the maximum particle size of the crushed particles is 1-3 cm. If the particles are too fine, the requirements for the crushing equipment are high and the energy consumption is high; if they are too coarse, it is not conducive to degradation.

[0012] Furthermore, in step S3, the pH of the acetic acid solution is 2-4 (all pH values ​​in this article were measured at 25°C). At this pH, the acidity is approximately 6 g / 100 mL. At this acidity, the cable sheath decomposes relatively quickly, but acidity measurement is quite cumbersome. Using pH as an indicator is beneficial for industrial production.

[0013] Furthermore, in step S4, the bacterial solution is... Pseudomonas putida KT2440 and Comamonas acidovorans TB-35 mixed bacterial solution.

[0014] Furthermore, the mixed bacterial solution consists of bacteria with an OD600 of 0.1. Pseudomonas putida KT2440 bacterial suspension with OD600=0.1 Comamonas acidovorans The TB-35 bacterial suspension was obtained by mixing at a volume ratio of 5:6.

[0015] The beneficial effects of this invention are as follows: pH-responsive sheath material is obtained through polycondensation and chain extension. Cable sheaths made from this sheath material can withstand highly alkaline environments and are suitable for power network laying in highly alkaline environments such as saline-alkali land. This cable sheath has excellent environmental performance and can be treated by acid immersion and biodegradation, thus having practical value. Detailed Implementation

[0016] The following is a further explanation with reference to specific implementation methods: Example 1

[0017] Weigh the following parts by weight of raw materials: 60 parts of polyacetal diol (M) n =2000g / mol, the same below), 15 parts of 1,4-butanediol benzoaldehyde (purity 99%, the same below), 12 parts of 4,4'-diphenylmethane diisocyanate, 3 parts of 1,4-butanediol, 2 parts of octadecyl isocyanate, 1 part of perfluorohexylethyl isocyanate, 0.05 parts of organic bismuth catalyst (BiCAT 8108, the same below), 0.3 parts of antioxidant 1010, 0.2 parts of ultraviolet absorber UV-327, 2 parts of carbon black N330, 0.5 parts of calcium stearate and 1 part of hydrophobic nano silica.

[0018] Preparation method: Step 1: Weigh out polyacetal glycol, 1,4-butanediol acetal, 4,4'-diphenylmethane diisocyanate, octadecyl isocyanate, perfluorohexyl ethyl isocyanate, and organic bismuth catalyst. Step 2: Add the above raw materials to the reactor and react at 80°C for 3 hours to obtain the prepolymer; Step 3: Weigh 1,4-butanediol as a chain extender, add 1,4-butanediol to the prepolymer to carry out the chain extension reaction, the reaction temperature is 90℃, the reaction time is 2h, and the main chain is obtained. Step 4: Weigh out antioxidant 1010, ultraviolet absorber UV-327, carbon black N330, calcium stearate and hydrophobic nano silica, mix them as functional additives. Step 5: Add the functional additives to the main chain, stir at 100 r / min for 10 min, and after thorough stirring, keep at 110℃ for 4 h to complete the curing and obtain the sheath material; Step six: The sheath material is extruded and wrapped around the cable core to obtain a specific decomposition environmentally friendly alkali-resistant cable sheath.

[0019] Degradation methods: S1, strip the cable sheath from the core wire; S2, crush the cable sheath, the maximum particle size of the crushed particles is 1cm; S3, Soak the cable sheath in an acetic acid solution with pH=2 for 24 hours, then remove the cable sheath and drain. S4. The cable sheath is immersed in the bacterial solution at 30°C and aerated for 30 days to complete the degradation. The bacterial solution is a mixed bacterial solution obtained by mixing Pseudomonas putida KT2440 bacterial suspension (bacterial strain purchased from Beijing Biowell Biotechnology Co., Ltd.) with OD600=0.1 and Commonas acidovorans TB-35 bacterial suspension (bacterial strain purchased from Beijing Biowell Biotechnology Co., Ltd.) at a volume ratio of 5:6.

[0020] Example 2

[0021] Weigh the following parts by weight of raw materials: The composition includes 65 parts of polyacetal diol, 20 parts of 1,4-butanediol benzoaldehyde, 15 parts of 4,4'-diphenylmethane diisocyanate, 5 parts of 1,4-butanediol, 3 parts of octadecyl isocyanate, 2 parts of perfluorohexylethyl isocyanate, 0.1 parts of organic bismuth catalyst, 0.5 parts of antioxidant 1010, 0.4 parts of ultraviolet absorber UV-327, 3 parts of carbon black N330, 1 part of calcium stearate, and 2 parts of hydrophobic nano silica.

[0022] Preparation method: Step 1: Weigh out polyacetal glycol, 1,4-butanediol acetal, 4,4'-diphenylmethane diisocyanate, octadecyl isocyanate, perfluorohexyl ethyl isocyanate, and organic bismuth catalyst. Step 2: Add the above raw materials to the reactor and react at 85°C for 2 hours to obtain the prepolymer; Step 3: Weigh 1,4-butanediol as a chain extender, add 1,4-butanediol to the prepolymer to carry out the chain extension reaction, the reaction temperature is 95℃, the reaction time is 1h, and the main chain is obtained. Step 4: Weigh out antioxidant 1010, ultraviolet absorber UV-327, carbon black N330, calcium stearate and hydrophobic nano silica, mix them as functional additives. Step 5: Add the functional additives to the main chain, stir at 150 r / min for 5 min, and after thorough stirring, keep at 110℃ for 4 h to complete the curing and obtain the sheath material; Step six: The sheath material is extruded and wrapped around the cable core to obtain a specific decomposition environmentally friendly alkali-resistant cable sheath.

[0023] Degradation methods: S1, strip the cable sheath from the core wire; S2, crush the cable sheath, the maximum particle size of the crushed particles is 3cm; S3, Soak the cable sheath in an acetic acid solution with pH=4 for 48 hours, then remove the cable sheath and drain. S4. The cable sheath is immersed in the bacterial solution at 35°C and aerated for 60 days to complete the degradation. The bacterial solution is a mixed bacterial solution obtained by mixing Pseudomonas putida KT2440 bacterial suspension with OD600=0.1 and Commonas acidovorans TB-35 bacterial suspension with OD600=0.1 at a volume ratio of 5:6.

[0024] Example 3

[0025] Weigh the following parts by weight of raw materials: The composition includes 62.5 parts of polyacetal diol, 17.5 parts of 1,4-butanediol benzoaldehyde, 13.5 parts of 4,4'-diphenylmethane diisocyanate, 4 parts of 1,4-butanediol, 2.5 parts of octadecyl isocyanate, 1.5 parts of perfluorohexylethyl isocyanate, 0.075 parts of organobismuth catalyst, 0.4 parts of antioxidant 1010, 0.3 parts of ultraviolet absorber UV-327, 2.5 parts of carbon black N330, 0.75 parts of calcium stearate, and 1.5 parts of hydrophobic nano-silica.

[0026] Preparation method: Step 1: Weigh out polyacetal glycol, 1,4-butanediol acetal, 4,4'-diphenylmethane diisocyanate, octadecyl isocyanate, perfluorohexyl ethyl isocyanate, and organic bismuth catalyst. Step 2: Add the above raw materials to the reactor and react at 82.5℃ for 2.5h to obtain the prepolymer; Step 3: Weigh 1,4-butanediol as a chain extender, add 1,4-butanediol to the prepolymer to carry out the chain extension reaction, the reaction temperature is 92.5℃, the reaction time is 1.5h, and the main chain is obtained. Step 4: Weigh out antioxidant 1010, ultraviolet absorber UV-327, carbon black N330, calcium stearate and hydrophobic nano silica, mix them as functional additives. Step 5: Add the functional additives to the main chain, stir at 125 r / min for 7.5 min, and after thorough stirring, keep at 110℃ for 4 h to complete the curing and obtain the sheath material; Step six: The sheath material is extruded and wrapped around the cable core to obtain a specific decomposition environmentally friendly alkali-resistant cable sheath.

[0027] Degradation methods: S1, strip the cable sheath from the core wire; S2, crush the cable sheath, the maximum particle size of the crushed particles is 2cm; S3, Soak the cable sheath in an acetic acid solution with pH=3 for 36 hours, then remove the cable sheath and drain. S4. The cable sheath is immersed in the bacterial solution at a temperature of 32.5℃ and aerated for 45 days to complete the degradation. The bacterial solution is a mixed bacterial solution obtained by mixing Pseudomonas putida KT2440 bacterial suspension with OD600=0.1 and Commonas acidovorans TB-35 bacterial suspension with OD600=0.1 at a volume ratio of 5:6.

[0028] Comparative Example 1 The only difference from Example 3 is that the acetic acid solution in step S3 of the degradation method is replaced with an equal volume of sodium carbonate aqueous solution with pH 9.

[0029] Comparative Example 2 The only difference from Example 3 is that the acetic acid solution in step S3 of the degradation method is replaced with an equal volume of pure water.

[0030] Comparative Example 3 The only difference from Example 3 is that the mixed bacterial solution was replaced with a suspension of Pasteurella acetic acid bacteria with an OD600 of 0.1 (the strain was purchased from Beijing Bio-Bio Biotechnology Co., Ltd.).

[0031] Mechanical properties The cable sheath obtained in Example 3 was subjected to conventional mechanical property tests, and the results are shown in Table 1.

[0032] Table 1 Mechanical Performance Indicators

[0033] Tests show that the cable sheath obtained by this invention meets the basic mechanical strength requirements for cable sheaths.

[0034] Hydrophobicity test The cable sheaths prepared in Example 3, Comparative Example 1, and Comparative Example 2 (i.e., the cable sheaths obtained in step six of the preparation method) were subjected to water contact angle measurement after preparation. 初始 The water contact angle was measured after the cable sheath had been soaked and drained (i.e., after treatment in step S3 of the degradation method). pH响应后 The results are shown in Table 2.

[0035] Table 2 Hydrophobic properties

[0036] Therefore, it can be seen that the cable sheath obtained by this invention can change from hydrophobic to hydrophilic properties under acidic conditions, and this change is entirely dependent on the acidic environment; neither Comparative Example 1 (alkaline) nor Comparative Example 2 (neutral) can achieve this change. This change is beneficial for subsequent microbial degradation of the cable sheath using it as a carbon source.

[0037] Degradation efficiency test The cable sheaths prepared in Example 3 and Comparative Examples 1-3 (i.e., the cable sheaths obtained in step six of the preparation method) were weighed after preparation. 初始 After degradation (i.e., the cable sheath treated by the degradation method), it is dried to constant weight and then weighed. 降解后 The results are shown in Table 3.

[0038] Table 3 Degradation efficiency

[0039] As shown in Table 3, in Example 3, after immersion in acetic acid solution and biodegradation, the cable sheath was largely degraded, demonstrating very high efficiency. In contrast, Comparative Examples 1 and 2, which did not undergo acetic acid immersion and used the same bacterial suspension for decomposition, struggled to effectively ferment due to the hydrophobic nature of the sheath material. Although Comparative Example 3 underwent acetic acid immersion and used *Pasteurella multocida*, which thrives in acidic environments, its degradation efficiency was very low, even lower than that of Comparative Examples 1 and 2. This indicates that not all aerobic bacteria that prefer acidic environments can be used for the degradation of the cable sheath obtained in this invention.

[0040] The embodiments and descriptions above are merely illustrative of the principles and preferred embodiments of the present invention. Various changes and modifications may be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A specific decomposition-resistant, environmentally friendly, alkali-resistant cable sheath, characterized in that, It is prepared from the following parts by weight of raw materials: The mixture contains 60-65 parts of polyacetal diol, 15-20 parts of 1,4-butanediol benzoaldehyde, 12-15 parts of 4,4'-diphenylmethane diisocyanate, 3-5 parts of 1,4-butanediol, 2-3 parts of octadecyl isocyanate, 1-2 parts of perfluorohexylethyl isocyanate, and 0.05-0.1 parts of organic bismuth catalyst.

2. The specific decomposition environmentally friendly alkali-resistant cable sheath according to claim 1, characterized in that: The raw materials also include functional additives, which are obtained by mixing the following components in parts by weight: Antioxidant 1010 0.3-0.5 parts, UV absorber UV-327 0.2-0.4 parts, carbon black N330 2-3 parts, calcium stearate 0.5-1 parts, and hydrophobic nano silica 1-2 parts.

3. A method for preparing a specific decomposition environmentally friendly alkali-resistant cable sheath as described in claim 2, characterized in that, Includes the following steps: Step 1: Weigh out polyacetal diol, 1,4-butanediol acetal, 4,4'-diphenylmethane diisocyanate, octadecyl isocyanate, perfluorohexyl ethyl isocyanate, and organic bismuth catalyst. Step 2: Add the above raw materials to the reactor and react at 80-85℃ for 2-3 hours to obtain the prepolymer; Step 3: Weigh 1,4-butanediol as a chain extender, add 1,4-butanediol to the prepolymer to carry out the chain extension reaction, the reaction temperature is 90-95℃, the reaction time is 1-2h, and the main chain is obtained. Step 4: Weigh out antioxidant 1010, ultraviolet absorber UV-327, carbon black N330, calcium stearate and hydrophobic nano silica, mix them and use them as functional additives. Step 5: Add the functional additives to the main chain, stir thoroughly, and keep at 110℃ for 4 hours to complete the curing process, thus obtaining the sheath material; Step six: The sheath material is extruded and wrapped around the cable core to obtain a specific decomposition environmentally friendly alkali-resistant cable sheath.

4. The preparation method according to claim 3, characterized in that: The method for thorough stirring in step five is to stir at a speed of 100-150 r / min for 5-10 min.

5. A method for specifically decomposing environmentally friendly alkali-resistant cable sheaths as described in claim 2, characterized in that, Includes the following steps: S1, strip the cable sheath from the core wire; S2, breaks the cable sheath; S3, Soak the cable sheath in acetic acid solution for 24-48 hours, then remove the cable sheath and drain. S4. Immerse the cable sheath in the bacterial solution at a temperature of 30-35℃ and aerate for 30-60 days to complete the degradation.

6. The degradation method according to claim 5, characterized in that: The maximum particle size of the crushed particles in step S2 is 1-3 cm.

7. The degradation method according to claim 5, characterized in that: In step S3, the pH of the acetic acid solution is 2-4.

8. The degradation method according to claim 5, characterized in that: In step S4, the bacterial solution is... Pseudomonas putida KT2440 and Comamonas acidovorans TB-35 mixed bacterial solution.

9. The degradation method according to claim 8, characterized in that: The mixed bacterial solution has an OD600 of 0.

1. Pseudomonas putida KT2440 bacterial suspension with OD600=0.1 Comamonas acidovorans The TB-35 bacterial suspension was obtained by mixing at a volume ratio of 5:6.

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