A compression-resistant wear-resistant HDPE cable protection pipe and a preparation method thereof

Abstract

This invention relates to a pressure-resistant and wear-resistant HDPE cable protection pipe and its preparation method, belonging to the technical field of HDPE cable protection pipes. A pressure-resistant and wear-resistant HDPE cable protection pipe comprises the following components: high-density polyethylene and wear-resistant composite filler; the preparation of the wear-resistant composite filler includes: under an inert atmosphere, adding a mixture of aluminum nitrate, zinc nitrate, and deionized water, and an aqueous sodium hydroxide solution dropwise to an antioxidant; after standing, filtering to obtain the solid, washing, and drying to obtain a mixture; modifying diamond treated with an aqueous sodium hydroxide solution by adding a silane coupling agent to obtain pretreated diamond; melting and extruding the pretreated diamond, the mixture, and a compatibilizer, and then pelletizing to obtain the final product. This invention, by organically modifying the filler, increases its compatibility and dispersibility, giving the HDPE cable protection pipe excellent pressure resistance and wear resistance.

Description

Technical Field

[0001] This invention belongs to the technical field of HDPE cable protection pipes, and relates to a pressure-resistant and wear-resistant HDPE cable protection pipe and its preparation method. Background Technology

[0002] HDPE cable protection pipes are widely used for the laying and protection of underground cables. Their main component is high-density polyethylene (HDPE), a material with excellent chemical stability, corrosion resistance, and impact resistance. HDPE cable protection pipes not only effectively protect cables from environmental damage but also extend their service life, ensuring the safety and reliability of power transmission.

[0003] In cable protection conduits, antioxidants and other organic additives are used to improve their stability and durability during long-term use. However, these organic substances tend to volatilize and migrate into the surrounding environment over extended periods. This volatilization and migration causes these additives to gradually lose their original anti-aging properties, leading to the cable protection conduits becoming harder and more brittle. Ultimately, this can significantly shorten the service life of the cable protection conduits, or even affect their normal use.

[0004] Diamond is an extremely hard and wear-resistant material, often used as a filler to improve the wear resistance of other materials. However, the compatibility of diamond with high-density polyethylene (HDPE) is not ideal. HDPE is a widely used plastic with good chemical stability and corrosion resistance, but when combined with diamond, the significant differences in their physical and chemical properties often lead to compatibility issues. To improve this compatibility, surface modification or other chemical treatments are usually required to enhance the bonding strength between diamond and HDPE, thereby enabling it to better fulfill its role as a wear-resistant filler in practical applications. Summary of the Invention

[0005] The purpose of this invention is to provide a pressure-resistant and wear-resistant HDPE cable protection pipe and its preparation method. This invention uses aluminum / zinc hydrotalcite to form a coating on the antioxidant, and uses silane coupling agent to modify the diamond, increasing the compatibility between it and the compatibilizer, changing the dispersion of diamond and aluminum / zinc hydrotalcite in the HDPE system, promoting its compatibility in the HDPE system, significantly improving the mechanical properties of the HDPE composite material, and giving it better wear resistance.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A pressure-resistant and wear-resistant HDPE cable protection pipe, wherein the HDPE cable protection pipe comprises the following components by weight:

[0008] 90-110 parts of high-density polyethylene and 15-20 parts of wear-resistant composite filler;

[0009] The preparation method of the wear-resistant composite filler includes the following steps:

[0010] S1. After stirring and mixing aluminum nitrate, zinc nitrate and deionized water, a mixture is obtained;

[0011] S2. Under an inert atmosphere, the mixture and sodium hydroxide aqueous solution are slowly added dropwise to the antioxidant. After standing, the solid is filtered, washed, and dried to obtain the mixture.

[0012] S3. Add diamond to sodium hydroxide aqueous solution, sonicate and heat, take solid, wash, dry, add to anhydrous ethanol and stir, add silane coupling agent and mechanically stir, filter to take solid, wash and dry to obtain pretreated diamond.

[0013] S4. After melting and extruding the pretreated diamond, the mixture and the compatibilizer, the mixture is granulated to obtain the wear-resistant composite filler.

[0014] As a preferred embodiment of the present invention, in steps S1-S2, the mass ratio of aluminum nitrate, zinc nitrate, deionized water, sodium hydroxide aqueous solution and antioxidant is 9-10.0:13-16:100:180-200:8.4-9.0.

[0015] As a preferred embodiment of the present invention, in step S2, the sodium hydroxide aqueous solution is prepared by mixing sodium hydroxide and deionized water at a ratio of 1g:20mL.

[0016] As a preferred embodiment of the present invention, in step S2, the antioxidant is composed of antioxidant 1076 and antioxidant 1010 mixed in a mass ratio of 1:2.5-3.0.

[0017] As a preferred embodiment of the present invention, in step S2, the inert atmosphere is a nitrogen inert atmosphere.

[0018] As a preferred embodiment of the present invention, in step S2, the settling time is 12-15 hours.

[0019] As a preferred embodiment of the present invention, in step S2, the washing is performed by washing with deionized water until neutral.

[0020] As a preferred technical solution of the present invention, in step S2, the drying is performed at a temperature of 80-90°C until constant weight.

[0021] As a preferred embodiment of the present invention, in step S3, the volume concentration of the sodium hydroxide aqueous solution is 20%.

[0022] As a preferred embodiment of the present invention, in step S3, the ultrasonic treatment time is 3-8 minutes.

[0023] As a preferred embodiment of the present invention, in step S3, the heat treatment is performed at a temperature of 80-85°C for 3-4 hours.

[0024] As a preferred embodiment of the present invention, in step S3, the washing is performed by washing with deionized water until neutral.

[0025] As a preferred embodiment of the present invention, in step S3, the drying is performed at a temperature of 90°C to a constant weight.

[0026] As a preferred embodiment of the present invention, in step S3, the mechanical stirring is performed at a temperature of 50-60℃ and a rotation speed of 400-500 r / min for 4-6 hours.

[0027] As a preferred embodiment of the present invention, in step S3, the washing is performed by washing three times with anhydrous ethanol.

[0028] As a preferred technical solution of the present invention, in step S3, the drying is performed at a temperature of 90°C to a constant weight.

[0029] As a preferred embodiment of the present invention, in step S3, the mass ratio of diamond, sodium hydroxide aqueous solution, anhydrous ethanol and silane coupling agent is 6-9:30-40:45-50:3.4-4.0.

[0030] As a preferred embodiment of the present invention, in step S3, the silane coupling agent is silane coupling agent NQ62.

[0031] As a preferred embodiment of the present invention, in step S4, the temperature of the melt extrusion is 190-210°C.

[0032] As a preferred embodiment of the present invention, in step S4, the mass ratio of the pretreated diamond, the mixture and the compatibilizer is 3.0-3.6:1.2-1.6:6.2-7.0.

[0033] As a preferred embodiment of the present invention, in step S4, the compatibilizer is a styrene-butadiene-glyceryl methacrylate copolymer.

[0034] A method for preparing a pressure-resistant and wear-resistant HDPE cable protection pipe, the method comprising the following steps: melting and extruding high-density polyethylene and wear-resistant composite filler at a temperature of 190-210℃, granulating, and shaping to obtain the desired product.

[0035] The beneficial effects of this invention are:

[0036] This invention utilizes aluminum / zinc hydrotalcite to coat antioxidants and modifies diamond with a silane coupling agent to increase compatibility with the compatibilizer. This alters the dispersion of diamond and aluminum / zinc hydrotalcite in the HDPE system, promoting compatibility within the HDPE system and significantly improving the mechanical properties of the HDPE composite material, giving it superior wear resistance. Detailed Implementation

[0037] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0038] Example 1

[0039] A pressure-resistant and wear-resistant HDPE cable protection pipe comprises the following components by weight:

[0040] 90 parts high-density polyethylene and 15 parts wear-resistant composite filler;

[0041] The preparation method of the wear-resistant composite filler includes the following steps:

[0042] S1. After stirring and mixing aluminum nitrate, zinc nitrate and deionized water, a mixture is obtained;

[0043] S2. Under a nitrogen inert atmosphere, the mixture and sodium hydroxide aqueous solution were slowly added dropwise to the antioxidant. After standing for 12 hours, the solid was filtered and washed with deionized water until neutral. After drying at 80°C to constant weight, the mixture was obtained.

[0044] S3. Add diamond to a 20% (v / v) sodium hydroxide aqueous solution and sonicate for 3 min. Then heat at 80°C for 3 h. Take the solid, wash it with deionized water until neutral, dry it at 90°C to constant weight, add it to anhydrous ethanol and stir to mix. Add silane coupling agent, stir at 50°C and 400 r / min for 4 h, filter to take the solid, wash it three times with anhydrous ethanol, and dry it at 90°C to constant weight to obtain pretreated diamond.

[0045] S4. After melting and extruding the pretreated diamond, mixture and compatibilizer at 190°C, the mixture is granulated to obtain wear-resistant composite filler.

[0046] In steps S1-S2, the mass ratio of aluminum nitrate, zinc nitrate, deionized water, sodium hydroxide aqueous solution, and antioxidant is 9:13:100:180:8.4; the sodium hydroxide aqueous solution is prepared by mixing sodium hydroxide and deionized water at a ratio of 1g:20mL; the antioxidant is prepared by mixing antioxidant 1076 and antioxidant 1010 at a mass ratio of 1:2.5.

[0047] In step S3, the mass ratio of diamond, sodium hydroxide aqueous solution, anhydrous ethanol and silane coupling agent is 6:30:45:3.4; the silane coupling agent is silane coupling agent NQ62.

[0048] In step S4, the mass ratio of the pretreated diamond, the mixture, and the compatibilizer is 3.0:1.2:6.2; the compatibilizer is a styrene-butadiene-glyceryl methacrylate copolymer.

[0049] A method for preparing a pressure-resistant and wear-resistant HDPE cable protection pipe includes the following steps:

[0050] The product is obtained by melting and extruding high-density polyethylene and wear-resistant composite filler at 190°C, granulating, and shaping.

[0051] Example 2

[0052] A pressure-resistant and wear-resistant HDPE cable protection pipe comprises the following components by weight:

[0053] 97 parts high-density polyethylene and 17 parts wear-resistant composite filler;

[0054] The preparation method of the wear-resistant composite filler includes the following steps:

[0055] S1. After stirring and mixing aluminum nitrate, zinc nitrate and deionized water, a mixture is obtained;

[0056] S2. Under a nitrogen inert atmosphere, the mixture and sodium hydroxide aqueous solution were slowly added dropwise to the antioxidant. After standing for 13 hours, the solid was filtered and washed with deionized water until neutral. After drying at 83°C to constant weight, the mixture was obtained.

[0057] S3. Add diamond to a 20% (v / v) sodium hydroxide aqueous solution and sonicate for 5 min. Then heat at 82°C for 3.5 h. Take the solid, wash it with deionized water until neutral, dry it at 90°C to constant weight, add it to anhydrous ethanol and stir to mix. Then add silane coupling agent and stir at 53°C and 430 r / min for 4.5 h. Filter to take the solid, wash it three times with anhydrous ethanol, and dry it at 90°C to constant weight to obtain pretreated diamond.

[0058] S4. After melting and extruding the pretreated diamond, mixture and compatibilizer at 197°C, the mixture is granulated to obtain wear-resistant composite filler.

[0059] In steps S1-S2, the mass ratio of aluminum nitrate, zinc nitrate, deionized water, sodium hydroxide aqueous solution, and antioxidant is 9.3:14:100:185:8.6; the sodium hydroxide aqueous solution is prepared by mixing sodium hydroxide and deionized water at a ratio of 1g:20mL; the antioxidant is prepared by mixing antioxidant 1076 and antioxidant 1010 at a mass ratio of 1:2.7.

[0060] In step S3, the mass ratio of diamond, sodium hydroxide aqueous solution, anhydrous ethanol and silane coupling agent is 7:33:47:3.6; the silane coupling agent is silane coupling agent NQ62.

[0061] In step S4, the mass ratio of the pretreated diamond, the mixture, and the compatibilizer is 3.2:1.3:6.5; the compatibilizer is a styrene-butadiene-glyceryl methacrylate copolymer.

[0062] A method for preparing a pressure-resistant and wear-resistant HDPE cable protection pipe includes the following steps:

[0063] The high-density polyethylene and wear-resistant composite filler are melt-extruded at 195℃, granulated, and shaped to obtain the final product.

[0064] Example 3

[0065] A pressure-resistant and wear-resistant HDPE cable protection pipe comprises the following components by weight:

[0066] 105 parts high-density polyethylene and 18 parts wear-resistant composite filler;

[0067] The preparation method of the wear-resistant composite filler includes the following steps:

[0068] S1. After stirring and mixing aluminum nitrate, zinc nitrate and deionized water, a mixture is obtained;

[0069] S2. Under a nitrogen inert atmosphere, the mixture and sodium hydroxide aqueous solution were slowly added dropwise to the antioxidant. After standing for 14 hours, the solid was filtered and washed with deionized water until neutral. After drying at 87°C to constant weight, the mixture was obtained.

[0070] S3. Add diamond to a 20% (v / v) sodium hydroxide aqueous solution and sonicate for 6 min. Then heat at 83°C for 3.5 h. Take the solid, wash it with deionized water until neutral, dry it at 90°C to constant weight, add it to anhydrous ethanol and stir to mix. Then add silane coupling agent and stir at 57°C and 460 r / min for 5.5 h. Filter to take the solid, wash it three times with anhydrous ethanol, and dry it at 90°C to constant weight to obtain pretreated diamond.

[0071] S4. After melting and extruding the pretreated diamond, mixture and compatibilizer at 205℃, the mixture is granulated to obtain wear-resistant composite filler.

[0072] In steps S1-S2, the mass ratio of aluminum nitrate, zinc nitrate, deionized water, sodium hydroxide aqueous solution, and antioxidant is 9.7:15:100:195:8.8; the sodium hydroxide aqueous solution is prepared by mixing sodium hydroxide and deionized water at a ratio of 1g:20mL; the antioxidant is prepared by mixing antioxidant 1076 and antioxidant 1010 at a mass ratio of 1:2.8.

[0073] In step S3, the mass ratio of diamond, sodium hydroxide aqueous solution, anhydrous ethanol and silane coupling agent is 8:37:48:3.8; the silane coupling agent is silane coupling agent NQ62.

[0074] In step S4, the mass ratio of the pretreated diamond, the mixture, and the compatibilizer is 3.4:1.5:6.7; the compatibilizer is a styrene-butadiene-glyceryl methacrylate copolymer.

[0075] A method for preparing a pressure-resistant and wear-resistant HDPE cable protection pipe includes the following steps:

[0076] The high-density polyethylene and wear-resistant composite filler are melt-extruded at 205℃, granulated, and shaped to obtain the final product.

[0077] Example 4

[0078] A pressure-resistant and wear-resistant HDPE cable protection pipe comprises the following components by weight:

[0079] 110 parts high-density polyethylene and 20 parts wear-resistant composite filler;

[0080] The preparation method of the wear-resistant composite filler includes the following steps:

[0081] S1. After stirring and mixing aluminum nitrate, zinc nitrate and deionized water, a mixture is obtained;

[0082] S2. Under a nitrogen inert atmosphere, the mixture and sodium hydroxide aqueous solution were slowly added dropwise to the antioxidant. After standing for 15 hours, the solid was filtered and washed with deionized water until neutral. After drying at 90°C to constant weight, the mixture was obtained.

[0083] S3. Add diamond to a 20% (v / v) sodium hydroxide aqueous solution and sonicate for 8 min. Then heat at 85°C for 4 h. Take the solid, wash it with deionized water until neutral, dry it at 90°C to constant weight, add it to anhydrous ethanol and stir to mix. Add silane coupling agent, stir at 60°C and 500 r / min for 6 h, filter to take the solid, wash it three times with anhydrous ethanol, and dry it at 90°C to constant weight to obtain pretreated diamond.

[0084] S4. After melting and extruding the pretreated diamond, mixture and compatibilizer at 210℃, the mixture is granulated to obtain wear-resistant composite filler.

[0085] In steps S1-S2, the mass ratio of aluminum nitrate, zinc nitrate, deionized water, sodium hydroxide aqueous solution, and antioxidant is 10.0:16:100:200:9.0; the sodium hydroxide aqueous solution is prepared by mixing sodium hydroxide and deionized water at a ratio of 1g:20mL; the antioxidant is prepared by mixing antioxidant 1076 and antioxidant 1010 at a mass ratio of 1:3.0.

[0086] In step S3, the mass ratio of diamond, sodium hydroxide aqueous solution, anhydrous ethanol and silane coupling agent is 9:40:50:4.0; the silane coupling agent is silane coupling agent NQ62.

[0087] In step S4, the mass ratio of the pretreated diamond, the mixture, and the compatibilizer is 3.6:1.6:7.0; the compatibilizer is a styrene-butadiene-glyceryl methacrylate copolymer.

[0088] A method for preparing a pressure-resistant and wear-resistant HDPE cable protection pipe includes the following steps:

[0089] The high-density polyethylene and wear-resistant composite filler are melt-extruded at 210℃, granulated, and shaped to obtain the final product.

[0090] Comparative Example 1

[0091] The difference compared to Example 4 lies in step S2;

[0092] Step S2: Under a nitrogen inert atmosphere, the mixture and sodium hydroxide aqueous solution are mixed and allowed to stand for 15 hours. The solid is then filtered and washed with deionized water until neutral. After drying at 90°C to constant weight, an antioxidant is added and mixed to obtain the mixture.

[0093] The remaining components, preparation steps, and parameters are all the same.

[0094] Comparative Example 2

[0095] Compared with Example 4, the difference is that step S3 does not use an aqueous sodium hydroxide solution, while the other components, preparation steps and parameters are the same.

[0096] Comparative Example 3

[0097] Compared with Example 4, the difference is that step S3 does not use a silane coupling agent, while the remaining components, preparation steps and parameters are the same.

[0098] Comparative Example 4

[0099] The difference from Example 4 is that step S4 does not use a compatibilizer, while the other components, preparation steps and parameters are the same.

[0100] The HDPE cable protection pipes prepared in Examples 1-4 and Comparative Examples 1-4 were subjected to the following mechanical property tests, and the test results are shown in Table 1.

[0101] Mechanical performance testing: in accordance with GB / T 2951.11-2008.

[0102] Table 1

[0103]

[0104]

[0105] As can be seen from the test results in Table 1, the HDPE flame-retardant pipes prepared in Examples 1-4 of the present invention have good mechanical properties and are not easily worn.

[0106] Comparative analysis of the test results from Examples 1-4, Comparative Examples 1-4, and Table 1 shows that the present invention uses aluminum / zinc hydrotalcite to coat the antioxidant, making the antioxidant less prone to migration. The presence of the antioxidant also alters the dispersibility of the aluminum / zinc hydrotalcite, resulting in a more uniform dispersion in the HDPE system. The hydrotalcite coating of organic matter increases the interfacial bonding force between the hydrotalcite and the pretreated diamond and compatibilizer, thus increasing its compatibility. The silane coupling agent-modified diamond increases its compatibility with the compatibilizer, alters the dispersibility of the diamond in the HDPE system, promotes its compatibility with the HDPE system, and significantly improves the mechanical properties of the HDPE composite material, giving it superior wear resistance.

[0107] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pressure-resistant and wear-resistant HDPE cable protection pipe, characterized in that, The HDPE cable protection pipe comprises the following components by weight: 90-110 parts of high-density polyethylene and 15-20 parts of wear-resistant composite filler; The preparation method of the wear-resistant composite filler includes the following steps: S1. After stirring and mixing aluminum nitrate, zinc nitrate and deionized water, a mixture is obtained; S2. Under an inert atmosphere, the mixture and sodium hydroxide aqueous solution are slowly added dropwise to the antioxidant. After standing, the solid is filtered, washed, and dried to obtain the mixture. S3. Add diamond to sodium hydroxide aqueous solution, sonicate and heat, take the solid, wash and dry it, add it to anhydrous ethanol and stir to mix, add silane coupling agent and mechanically stir, filter to take the solid, wash and dry it to obtain pretreated diamond. S4. After melting and extruding the pretreated diamond, mixture and compatibilizer, the mixture is granulated to obtain wear-resistant composite filler; In steps S1-S2, the mass ratio of aluminum nitrate, zinc nitrate, deionized water, sodium hydroxide aqueous solution, and antioxidant is 9-10.0:13-16:100:180-200:8.4-9.0; the sodium hydroxide aqueous solution is prepared by mixing sodium hydroxide and deionized water at a ratio of 1g:20mL; the antioxidant is prepared by mixing antioxidant 1076 and antioxidant 1010 at a mass ratio of 1:2.5-3.

0.

2. The pressure-resistant and wear-resistant HDPE cable protection pipe according to claim 1, characterized in that: In step S2, the inert atmosphere is a nitrogen inert atmosphere; the standing time is 12-15 hours; the washing is done with deionized water until neutral; and the drying is done at 80-90°C until constant weight.

3. The pressure-resistant and wear-resistant HDPE cable protection pipe according to claim 1, characterized in that: In step S3, the volume concentration of the sodium hydroxide aqueous solution is 20%; the ultrasonic treatment time is 3-8 min; the heating treatment is performed at 80-85℃ for 3-4 h; the washing is performed with deionized water until neutral; the drying is performed at 90℃ to constant weight; the mechanical stirring is performed at 50-60℃ and 400-500 r / min for 4-6 h; the washing is performed three times with anhydrous ethanol; and the drying is performed at 90℃ to constant weight.

4. The pressure-resistant and wear-resistant HDPE cable protection pipe according to claim 1, characterized in that: In step S3, the mass ratio of diamond, sodium hydroxide aqueous solution, anhydrous ethanol and silane coupling agent is 6-9:30-40:45-50:3.4-4.0; the silane coupling agent is silane coupling agent NQ62.

5. The pressure-resistant and wear-resistant HDPE cable protection pipe according to claim 1, characterized in that: In step S4, the temperature of the melt extrusion is 190-210°C.

6. The pressure-resistant and wear-resistant HDPE cable protection pipe according to claim 1, characterized in that: In step S4, the mass ratio of the pretreated diamond, the mixture, and the compatibilizer is 3.0-3.6:1.2-1.6:6.2-7.0; the compatibilizer is a styrene-butadiene-glyceryl methacrylate copolymer.

7. A method for preparing a pressure-resistant and wear-resistant HDPE cable protection pipe as described in any one of claims 1 to 6, characterized in that, The preparation method includes the following steps: high-density polyethylene and wear-resistant composite filler are melt-extruded at a temperature of 190-210℃, granulated, and shaped to obtain the final product.

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