Acid and alkali corrosion resistant chemical cable sheath material and preparation method thereof

Abstract

The invention relates to the technical field of cable sheath materials, in particular to an acid and alkali corrosion resistant chemical cable sheath material and a preparation method thereof, and the acid and alkali corrosion resistant chemical cable sheath material is prepared from the following raw materials in parts by weight: 65-70 parts of polypropylene, 2-4 parts of a first additive, 3-5 parts of a second additive, 5-8 parts of montmorillonite, 3-5 parts of nano silicon dioxide, 2-3 parts of nano zinc oxide and 1-2 parts of an antioxidant 1010, in the preparation process of the first additive, rice hull ash powder obtained through calcination is subjected to KH550 coupling modification and then is uniformly dispersed in a matrix, the second additive is a cross-linked structure generated through a reaction of a flaxseed derivative and epoxy chloropropane, and then the cross-linked structure is blended with alkyl phenolic resin and butadiene styrene rubber to form an elastic network; and matrix pores can be effectively filled and a corrosion factor diffusion path is blocked, so that corrosion of an acid-base medium to a polypropylene molecular chain is inhibited, and the cable is ensured to have a good service life in a chemical engineering occasion.

Description

Technical Field

[0001] This invention relates to the field of cable sheath materials technology, specifically to an acid and alkali resistant chemical cable sheath material and its preparation method. Background Technology

[0002] Cable sheathing materials for chemical applications are a key component used to protect cable conductors from external environmental corrosion. Especially in chemical environments where acid and alkali corrosive media are present, sheathing materials are required to have excellent chemical corrosion resistance, high mechanical strength, and good durability. These materials are often based on polyolefins such as polypropylene, and functional additives are added to improve their overall performance.

[0003] In existing technologies, cable sheaths used in chemical applications often incorporate functional additives to improve their resistance to acid and alkali corrosion. However, the interfacial compatibility between these additives and the base material is often poor. Under the long-term action of corrosive media, the interface easily becomes a corrosion penetration path, leading to a decrease in sheath life. Therefore, this invention provides an acid and alkali resistant cable sheath material for chemical applications and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide an acid and alkali resistant cable sheath material for chemical applications and its preparation method. The cable sheath material prepared by this invention not only has good corrosion resistance but also excellent interfacial bonding strength, effectively improving the performance of the cable sheath material.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an acid and alkali resistant chemical cable sheath material, prepared from the following raw materials in parts by weight: 65-70 parts of polypropylene, 2-4 parts of first additive, 3-5 parts of second additive, 5-8 parts of montmorillonite, 3-5 parts of nano silica, 2-3 parts of nano zinc oxide and 1-2 parts of antioxidant 1010.

[0006] The raw materials for the first additive include rice husks, dilute hydrochloric acid, silane coupling agent KH-550, and sodium dodecylbenzene sulfonate;

[0007] The raw materials for the second additive include flaxseed, epichlorohydrin, isopropanol, silane coupling agent KH-550, alkylphenol resin, hydroquinone, emulsion styrene-butadiene rubber, and methyl acrylate.

[0008] Preferably, the preparation method of the first additive includes the following steps:

[0009] Step A: Take rice husks, wash them, dry them at 100-110℃, then calcine them at 650-750℃, grind them, and pass them through a 400-500 mesh sieve to obtain rice husk ash powder.

[0010] Step B: Mix anhydrous ethanol and dilute hydrochloric acid, stir for 5-10 minutes at 25-35℃ and 150-200 r / min, add silane coupling agent KH-550 dropwise, and continue stirring for 30-40 minutes after the addition is complete to obtain the first treatment agent, wherein the mass fraction of dilute hydrochloric acid is 10%.

[0011] Step C: Sodium dodecylbenzenesulfonate, deionized water and the first treatment agent are mixed and stirred for 1-2 hours at 30-45℃ and 200-300r / min to obtain the first mixture;

[0012] Step D: Mix rice husk ash powder and the first mixture, and stir for 15-30 minutes at 35-50℃ and 250-400r / min to obtain the first additive.

[0013] Preferably, the mass ratio of the anhydrous ethanol, dilute hydrochloric acid and silane coupling agent KH-550 is (4-6):(0.3-0.5):1.

[0014] Preferably, the mass ratio of sodium dodecylbenzenesulfonate, deionized water and the first treatment agent is 1:(10-15):(0.05-0.10).

[0015] Preferably, the preparation method of the second additive includes the following steps:

[0016] Step a: Take flax seeds, dry them, crush them, and pass them through an 80-100 mesh sieve to obtain flax seed powder. Mix the flax seed powder, epichlorohydrin and isopropanol, and then add silane coupling agent KH-550. Stir for 2-3 hours at 50-60℃ and 200-300r / min to obtain the second mixture.

[0017] Step b: Mix alkylphenol resin, hydroquinone and emulsion styrene-butadiene rubber, and stir at 55-65℃ for 10-20 min to obtain the third mixture;

[0018] Step c: Add the second mixture, the third mixture, methyl acrylate, and anhydrous ethanol to the reaction vessel. Under nitrogen protection, adjust the pH to 8-9 and stir at a constant temperature of 50-60℃ and 150-200 r / min for 2.5-3.5 h to generate a treatment solution. Then, rotary evaporate the treatment solution at 60-70℃ under reduced pressure, dry it under vacuum, and pulverize it through a 200-300 mesh sieve to obtain the second additive.

[0019] Preferably, the mass ratio of the second mixture, the third mixture, methyl acrylate and anhydrous ethanol is (4-8):(4-8):10:(10-15).

[0020] Preferably, the mass ratio of the flaxseed powder, epichlorohydrin, isopropanol and silane coupling agent KH-550 is 1:(2-3):(10-15):(0.3-0.5).

[0021] Preferably, the mass ratio of the alkylphenol resin, hydroquinone, and emulsion styrene-butadiene rubber is 10:(0.1-0.2):(5-6).

[0022] Preferably, the mass ratio of the rice husk ash powder to the first mixture is 10:(1-3).

[0023] A preferred method for developing a chemical cable sheath material resistant to acid and alkali corrosion includes the following steps:

[0024] S1: Weigh out polypropylene, first additive, second additive, montmorillonite, nano silica, nano zinc oxide and antioxidant 1010 as needed, put them into a high-speed mixer, mix for 10-20 minutes at 300-500 r / min to obtain a premix.

[0025] S2: Transfer the premixed material to a twin-screw extruder, and melt-blend and granulate it at a temperature of 180-220℃ to obtain cable material granules;

[0026] S3: The cable material particles are extruded through a cable extruder at 170-210℃ and coated onto the conductor. After cooling, traction, and winding, an acid and alkali resistant chemical cable sheath material is obtained.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. In the preparation process of the first additive, the rice husk ash powder obtained by calcination is uniformly dispersed in the matrix after KH550 coupling modification. The second additive is formed by reacting flaxseed derivatives with epichlorohydrin to generate a cross-linked structure, and then blending it with alkylphenol resin and styrene-butadiene rubber to form an elastic network. Through the synergistic effect of the first additive and the second additive, the pores of the matrix can be effectively filled and the diffusion path of corrosive factors can be blocked, thereby inhibiting the erosion of polypropylene molecular chains by acid and alkali media and ensuring that the cable has a good service life in chemical environments.

[0029] 2. In this invention, the second additive, based on the cross-linked network formed by the reaction of flaxseed derivatives and epichlorohydrin, is further blended with alkylphenol resin and styrene-butadiene rubber to construct an elastomer that can absorb deformation caused by mechanical stress, inhibit the initiation and propagation of microcracks, and effectively improve the flexibility of the sheath material. Meanwhile, the rice husk ash powder in the first additive, after being modified by KH550, forms rigid support points in the matrix, and at the same time, it synergistically enhances the overall rigidity with montmorillonite and nano-oxides. This combination of rigidity and flexibility allows the cable sheath to maintain a complete seal even under frequent bending and vibration in chemical environments, effectively improving the mechanical properties that the cable sheath should possess. Attached Figure Description

[0030] Figure 1 The present invention provides a flowchart of a chemical cable sheath material resistant to acid and alkali corrosion and its preparation method. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that the raw materials used in the following embodiments are all commercially available.

[0033] Example 1:

[0034] A chemical cable sheath material resistant to acid and alkali corrosion is prepared from the following raw materials in parts by weight: 65 parts polypropylene, 2 parts first additive, 3 parts second additive, 5 parts montmorillonite, 3 parts nano silica, 2 parts nano zinc oxide and 1 part antioxidant 1010.

[0035] The raw materials for the first additive include rice husks, dilute hydrochloric acid, silane coupling agent KH-550, and sodium dodecylbenzene sulfonate.

[0036] The raw materials for the second additive include flaxseed, epichlorohydrin, isopropanol, silane coupling agent KH-550, alkylphenol resin, hydroquinone, emulsion styrene-butadiene rubber, and methyl acrylate.

[0037] The preparation method of the first additive includes the following steps:

[0038] Step A: Take rice husks, wash them, dry them at 100℃, then calcine them at 650℃, grind them, and pass them through a 400-mesh sieve to obtain rice husk ash powder.

[0039] Step B: Mix anhydrous ethanol and dilute hydrochloric acid, stir for 5 min at 25℃ and 150 r / min, add silane coupling agent KH-550 dropwise, and continue stirring for 30 min after the addition is complete to obtain the first treatment agent. The mass fraction of dilute hydrochloric acid is 10%, and the mass ratio of anhydrous ethanol, dilute hydrochloric acid and silane coupling agent KH-550 is 4:0.3:1.

[0040] Step C: Sodium dodecylbenzenesulfonate, deionized water and the first treatment agent are mixed at a mass ratio of 1:10:0.05 and stirred for 1 hour at 30°C and 200 r / min to obtain the first mixture.

[0041] Step D: Mix rice husk ash powder and the first mixture at a mass ratio of 10:1, and stir for 15 minutes at 35℃ and 250r / min to obtain the first additive.

[0042] The preparation method of the second additive includes the following steps:

[0043] Step a: Dry flaxseeds, pulverize them, and pass them through an 80-mesh sieve to obtain flaxseed powder. Mix the flaxseed powder, epichlorohydrin, and isopropanol, and then add silane coupling agent KH-550. Stir at 50℃ and 200r / min for 2 hours to obtain a second mixture. The mass ratio of flaxseed powder, epichlorohydrin, isopropanol, and silane coupling agent KH-550 is 1:2:10:0.3.

[0044] Step b: Mix alkylphenol resin, hydroquinone and emulsion styrene-butadiene rubber at a mass ratio of 10:0.1:5 and stir at 55°C for 10 min to obtain the third mixture;

[0045] Step c: Add the second mixture, the third mixture, methyl acrylate and anhydrous ethanol to the reactor in a mass ratio of 4:4:10:10. Under nitrogen protection, adjust the pH to 8 and stir at 50°C and 150 r / min for 2.5 h to generate a treatment solution. Then, evaporate the treatment solution under reduced pressure at 60°C, dry it under vacuum, and pulverize it through a 200-mesh sieve to obtain the second additive.

[0046] A method for developing an acid and alkali resistant cable sheath material for chemical applications includes the following steps:

[0047] S1: Weigh out polypropylene, first additive, second additive, montmorillonite, nano silica, nano zinc oxide and antioxidant 1010 as needed, put them into a high-speed mixer, mix for 10 minutes at 300 r / min to obtain a premix.

[0048] S2: The premixed material is transferred to a twin-screw extruder and melt-blended and extruded at 180°C to obtain cable material granules;

[0049] S3: Cable material granules are extruded through a cable extruder at 170°C and coated onto the conductor. After cooling, traction, and winding, a chemical cable sheath material resistant to acid and alkali corrosion is obtained.

[0050] Example 2:

[0051] A chemical cable sheath material resistant to acid and alkali corrosion is prepared from the following raw materials in parts by weight: 68 parts polypropylene, 3 parts first additive, 4 parts second additive, 6 parts montmorillonite, 4 parts nano silica, 2.5 parts nano zinc oxide and 1.5 parts antioxidant 1010.

[0052] The raw materials for the first additive include rice husks, dilute hydrochloric acid, silane coupling agent KH-550, and sodium dodecylbenzene sulfonate.

[0053] The raw materials for the second additive include flaxseed, epichlorohydrin, isopropanol, silane coupling agent KH-550, alkylphenol resin, hydroquinone, emulsion styrene-butadiene rubber, and methyl acrylate.

[0054] The preparation method of the first additive includes the following steps:

[0055] Step A: Take rice husks, wash them, dry them at 105℃, then calcine them at 700℃, grind them, and pass them through a 450-mesh sieve to obtain rice husk ash powder.

[0056] Step B: Mix anhydrous ethanol and dilute hydrochloric acid, stir for 8 min at 30℃ and 180 r / min, add silane coupling agent KH-550 dropwise, and continue stirring for 35 min after the addition is complete to obtain the first treatment agent. The mass fraction of dilute hydrochloric acid is 10%, and the mass ratio of anhydrous ethanol, dilute hydrochloric acid and silane coupling agent KH-550 is 5:0.4:1.

[0057] Step C: Sodium dodecylbenzenesulfonate, deionized water and the first treatment agent are mixed at a mass ratio of 1:12:0.08 and stirred at 38℃ and 250r / min for 1.5h to obtain the first mixture.

[0058] Step D: Mix rice husk ash powder and the first mixture at a mass ratio of 10:2, and stir for 25 minutes at 42℃ and 320r / min to obtain the first additive.

[0059] The preparation method of the second additive includes the following steps:

[0060] Step a: Dry flaxseeds, pulverize them, and pass them through a 90-mesh sieve to obtain flaxseed powder. Mix the flaxseed powder, epichlorohydrin, and isopropanol, then add silane coupling agent KH-550. Stir at 55℃ and 250r / min for 2.5h to obtain a second mixture. The mass ratio of flaxseed powder, epichlorohydrin, isopropanol, and silane coupling agent KH-550 is 1:2.5:12:0.4.

[0061] Step b: Mix alkylphenol resin, hydroquinone and emulsion styrene-butadiene rubber at a mass ratio of 10:0.15:5.5 and stir at 60°C for 15 minutes to obtain the third mixture;

[0062] Step c: Add the second mixture, the third mixture, methyl acrylate and anhydrous ethanol to the reactor in a mass ratio of 6:6:10:12. Under nitrogen protection, adjust the pH to 8 and stir at 55°C and 180 r / min for 3 hours to generate a treatment solution. Then, evaporate the treatment solution at 65°C under reduced pressure, dry it under vacuum, and pulverize it through a 250-mesh sieve to obtain the second additive.

[0063] A method for developing an acid and alkali resistant cable sheath material for chemical applications includes the following steps:

[0064] S1: Weigh out polypropylene, first additive, second additive, montmorillonite, nano silica, nano zinc oxide and antioxidant 1010 as needed, put them into a high-speed mixer, mix for 15 minutes at 400 r / min to obtain a premix.

[0065] S2: The premixed material is transferred to a twin-screw extruder and melt-blended and extruded at 200°C to obtain cable material granules;

[0066] S3: Cable material granules are extruded through a cable extruder at 190°C and coated onto the conductor. After cooling, traction, and winding, a chemical cable sheath material resistant to acid and alkali corrosion is obtained.

[0067] Comparative Example 3:

[0068] A chemical cable sheath material resistant to acid and alkali corrosion is prepared from the following raw materials in parts by weight: 70 parts polypropylene, 4 parts first additive, 5 parts second additive, 8 parts montmorillonite, 5 parts nano silica, 3 parts nano zinc oxide and 1-2 parts antioxidant 1010.

[0069] The raw materials for the first additive include rice husks, dilute hydrochloric acid, silane coupling agent KH-550, and sodium dodecylbenzene sulfonate.

[0070] The raw materials for the second additive include flaxseed, epichlorohydrin, isopropanol, silane coupling agent KH-550, alkylphenol resin, hydroquinone, emulsion styrene-butadiene rubber, and methyl acrylate.

[0071] The preparation method of the first additive includes the following steps:

[0072] Step A: Take rice husks, wash them, dry them at 110℃, then calcine them at 750℃, grind them, and pass them through a 500-mesh sieve to obtain rice husk ash powder.

[0073] Step B: Mix anhydrous ethanol and dilute hydrochloric acid, stir for 10 min at 35℃ and 200 r / min, add silane coupling agent KH-550 dropwise, and continue stirring for 40 min after the addition is complete to obtain the first treatment agent. The mass fraction of dilute hydrochloric acid is 10%, and the mass ratio of anhydrous ethanol, dilute hydrochloric acid and silane coupling agent KH-550 is 6:0.5:1.

[0074] Step C: Sodium dodecylbenzenesulfonate, deionized water and the first treatment agent are mixed at a mass ratio of 1:15:0.10 and stirred at 45℃ and 300r / min for 2 hours to obtain the first mixture.

[0075] Step D: Mix rice husk ash powder and the first mixture at a mass ratio of 10:3, and stir for 15-30 minutes at 50℃ and 400r / min to obtain the first additive.

[0076] The preparation method of the second additive includes the following steps:

[0077] Step a: Dry flaxseeds, pulverize them, and pass them through a 100-mesh sieve to obtain flaxseed powder. Mix the flaxseed powder, epichlorohydrin, and isopropanol, and then add silane coupling agent KH-550. Stir at 60℃ and 300r / min for 3 hours to obtain a second mixture. The mass ratio of flaxseed powder, epichlorohydrin, isopropanol, and silane coupling agent KH-550 is 1:3:15:0.5.

[0078] Step b: Mix alkylphenol resin, hydroquinone and emulsion styrene-butadiene rubber at a mass ratio of 10:0.2:6 and stir at 65°C for 20 minutes to obtain the third mixture;

[0079] Step c: Add the second mixture, the third mixture, methyl acrylate and anhydrous ethanol to the reactor in a mass ratio of 8:8:10:15. Under nitrogen protection, adjust the pH to 9 and stir at 60℃ and 200r / min for 3.5h to generate a treatment solution. Then, evaporate the treatment solution at 70℃ under reduced pressure, dry it under vacuum, and pulverize it through a 300-mesh sieve to obtain the second additive.

[0080] A method for developing an acid and alkali resistant cable sheath material for chemical applications includes the following steps:

[0081] S1: Weigh out polypropylene, first additive, second additive, montmorillonite, nano silica, nano zinc oxide and antioxidant 1010 as needed, put them into a high-speed mixer, mix for 20 minutes at 500 r / min to obtain a premix.

[0082] S2: The premixed material is transferred to a twin-screw extruder and melt-blended and extruded at 220°C to obtain cable material granules;

[0083] S3: Cable material granules are extruded through a cable extruder at 210°C and coated onto the conductor. After cooling, traction, and winding, a chemical cable sheath material resistant to acid and alkali corrosion is obtained.

[0084] Comparative Example 1: The difference between this comparative example and Example 1 is that this comparative example does not contain the first additive.

[0085] Comparative Example 2 differs from Example 1 in that it does not contain a second additive.

[0086] Comparative Example 3 differs from Example 1 in that it does not contain alkylphenol resin, styrene-butadiene rubber, montmorillonite, nano silica, or nano zinc oxide.

[0087] Performance testing: The cable sheath material samples prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance testing;

[0088] Chemical corrosion resistance test: Referring to GB / T 11547-2022 standard, 10% sulfuric acid solution and 10% sodium hydroxide solution were used to simulate chemical acidic and alkaline environments, respectively. The samples were placed in the solutions and kept at 24℃ for 7 days. After that, the samples were taken out, rinsed and dried, and the mass of the samples before and after the acidic and alkaline environments were measured. The mass change rate (%) was calculated and recorded in the table below.

[0089] Mechanical property testing: The elongation at break (%) and tensile strength (MPa) of the specimens were tested according to GB / T2951.11-2008 standard and recorded in the table below.

[0090] Table 1:

[0091]

[0092] Analysis and comparison of the data in the table above show that the cable sheath materials prepared using the methods in Examples 1-3 are superior to those in Comparative Examples 1-3 in both chemical corrosion resistance and mechanical properties. Specifically, Examples 1-3 exhibit extremely low acid and alkali resistance mass change rates, indicating excellent acid and alkali corrosion resistance. This demonstrates that the rice husk ash powder modified with KH550 in the first additive forms a dense physical shielding layer in the matrix, effectively blocking the penetration of acid and alkali media. Furthermore, the cross-linked network formed by the flaxseed derivative and epichlorohydrin in the second additive, blended with alkylphenol resin and styrene-butadiene rubber to form an elastomer, fills the pores in the matrix, further blocking the diffusion of corrosive agents. The two pathways work together to significantly reduce material swelling and corrosion penetration, thus laying the foundation for the material's excellent resistance to acid and alkali corrosion. The good high mechanical properties of Examples 1-3 are mainly due to the fact that the second additive, based on the cross-linking network formed by the reaction of flaxseed derivatives and epichlorohydrin, is further blended with alkylphenol resin and styrene-butadiene rubber to construct an elastomer that can absorb deformation caused by mechanical stress. The rice husk powder in the first additive, after being modified by KH550, forms rigid support points in the matrix, and at the same time, it works synergistically with montmorillonite and nano oxides to enhance the overall stiffness. This combination of rigidity and flexibility gives the cable sheath good mechanical properties.

[0093] Further analysis and comparison revealed that Comparative Example 1 exhibited comprehensive performance degradation after the absence of the first additive, particularly showing the highest rate of change in acid and alkali resistance, and severely deteriorated corrosion resistance. This is because the absence of the first additive resulted in the loss of the rice husk ash layer, weakening the interfacial bonding and allowing acid and alkali media to easily penetrate along the defects, leading to severe swelling. Simultaneously, the mechanical properties of Comparative Example 1 also decreased. However, because the second additive still provided some flexibility, the degree of degradation was not as significant as in Comparative Examples 2 and 3. In contrast, Comparative Example 2, lacking the second additive, showed a significant increase in the rate of change in acid and alkali resistance, only slightly better than Comparative Example 1, with its elongation at break... The corrosion resistance and tensile strength of the material were inferior to those of Comparative Example 1. This indicates that the material lost its cross-linking network and its density decreased after the second additive was removed, making it easier for corrosive media to penetrate. At the same time, the lack of flexibility also led to the inability to effectively disperse stress, resulting in deterioration of mechanical properties. In contrast, Comparative Example 3, which lacked fillers such as alkylphenol resin, styrene-butadiene rubber, montmorillonite, nano silica, and nano zinc oxide, had a smaller impact on corrosion resistance, but its mechanical properties were at the worst level. This is because the mechanical property optimization effect provided by the first and second additives was defective after the absence of montmorillonite and some reinforcing components, resulting in the worst mechanical properties.

[0094] By comparing and analyzing the relevant data in the table, it can be seen that the acid and alkali corrosion resistant chemical cable sheath material prepared by this invention not only has excellent resistance to chemical acid and alkali corrosion, but also exhibits good mechanical properties, which indicates that it has a broader market application prospect and is more suitable for promotion.

[0095] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0096] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A chemical cable sheath material resistant to acid and alkali corrosion, characterized in that, It is prepared from the following raw materials in parts by weight: 65-70 parts polypropylene, 2-4 parts first additive, 3-5 parts second additive, 5-8 parts montmorillonite, 3-5 parts nano silica, 2-3 parts nano zinc oxide and 1-2 parts antioxidant 1010. The raw materials for the first additive include rice husks, dilute hydrochloric acid, silane coupling agent KH-550, and sodium dodecylbenzene sulfonate; The raw materials for the second additive include flaxseed, epichlorohydrin, isopropanol, silane coupling agent KH-550, alkylphenol resin, hydroquinone, emulsion styrene-butadiene rubber, and methyl acrylate.

2. The acid and alkali resistant chemical cable sheath material according to claim 1, characterized in that, The preparation method of the first additive includes the following steps: Step A: Take rice husks, wash them, dry them at 100-110℃, then calcine them at 650-750℃, grind them, and pass them through a 400-500 mesh sieve to obtain rice husk ash powder. Step B: Mix anhydrous ethanol and dilute hydrochloric acid, stir for 5-10 minutes at 25-35℃ and 150-200 r / min, add silane coupling agent KH-550 dropwise, and continue stirring for 30-40 minutes after the addition is complete to obtain the first treatment agent, wherein the mass fraction of dilute hydrochloric acid is 10%. Step C: Sodium dodecylbenzenesulfonate, deionized water and the first treatment agent are mixed and stirred at 30-45℃ and 200-300r / min for 1-2 hours to obtain the first mixture; Step D: Mix rice husk ash powder and the first mixture, and stir for 15-30 minutes at 35-50℃ and 250-400r / min to obtain the first additive.

3. The acid and alkali resistant chemical cable sheath material according to claim 2, characterized in that, The mass ratio of anhydrous ethanol, dilute hydrochloric acid, and silane coupling agent KH-550 is (4-6):(0.3-0.5):

1.

4. The acid and alkali resistant chemical cable sheath material according to claim 2, characterized in that, The mass ratio of sodium dodecylbenzenesulfonate, deionized water and the first treatment agent is 1:(10-15):(0.05-0.10).

5. The acid and alkali resistant chemical cable sheath material according to claim 1, characterized in that, The preparation method of the second additive includes the following steps: Step a: Take flax seeds, dry them, crush them, and pass them through an 80-100 mesh sieve to obtain flax seed powder. Mix the flax seed powder, epichlorohydrin and isopropanol, and then add silane coupling agent KH-550. Stir for 2-3 hours at 50-60℃ and 200-300r / min to obtain the second mixture. Step b: Mix alkylphenol resin, hydroquinone and emulsion styrene-butadiene rubber, and stir at 55-65℃ for 10-20 min to obtain the third mixture; Step c: Add the second mixture, the third mixture, methyl acrylate, and anhydrous ethanol to the reaction vessel. Under nitrogen protection, adjust the pH to 8-9 and stir at a constant temperature of 50-60℃ and 150-200 r / min for 2.5-3.5 h to generate a treatment solution. Then, rotary evaporate the treatment solution at 60-70℃ under reduced pressure, dry it under vacuum, and pulverize it through a 200-300 mesh sieve to obtain the second additive.

6. The acid and alkali resistant chemical cable sheath material according to claim 5, characterized in that, The mass ratio of the second mixture, the third mixture, methyl acrylate and anhydrous ethanol is (4-8):(4-8):10:(10-15).

7. The acid and alkali resistant chemical cable sheath material according to claim 5, characterized in that, The mass ratio of the flaxseed powder, epichlorohydrin, isopropanol and silane coupling agent KH-550 is 1:(2-3):(10-15):(0.3-0.5).

8. The acid and alkali resistant cable sheath material for chemical applications according to claim 5, characterized in that, The mass ratio of the alkylphenol resin, hydroquinone, and emulsion styrene-butadiene rubber is 10:(0.1-0.2):(5-6).

9. The acid and alkali resistant chemical cable sheath material according to claim 2, characterized in that, The mass ratio of the rice husk ash powder to the first mixture is 10:(1-3).

10. A method for preparing the acid and alkali resistant cable sheath material for chemical applications as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Weigh out polypropylene, first additive, second additive, montmorillonite, nano silica, nano zinc oxide and antioxidant 1010 as needed, put them into a high-speed mixer, mix for 10-20 minutes at 300-500 r / min to obtain a premix. S2: Transfer the premixed material to a twin-screw extruder, and melt-blend and granulate it at a temperature of 180-220℃ to obtain cable material granules; S3: The cable material particles are extruded through a cable extruder at 170-210℃ and coated onto the conductor. After cooling, traction, and winding, an acid and alkali resistant chemical cable sheath material is obtained.

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