Fiber reinforced cable protection tube and preparation method thereof

Abstract

The invention relates to the technical field of cable materials, and discloses a fiber reinforced cable protection tube and a preparation method thereof. The preparation method comprises the following steps: step 1, heating a flame retardant, hydroxyl modified polyethylene and a mixed solvent to 150-160 DEG C, reacting for 10-12 hours under the protection of nitrogen, and removing the solvent to obtain high-flame-retardancy polyethylene; 2, polyethylene, polyvinyl chloride and high-flame-retardance polyethylene are taken and mixed uniformly, hydrogen-containing silicone oil and a platinum catalyst are added, vacuum melting and mixing are conducted for 10-12 h, inorganic filler, reinforced fibers and an initiator are added and mixed uniformly, a mixture is obtained, extrusion molding, cooling and cutting are conducted, and the cable protection pipe is obtained; the cable protection tube is prepared from the following raw materials in parts by mass: 60 to 70 parts of polyethylene, 15 to 20 parts of polyvinyl chloride, 15 to 20 parts of high-flame-retardance polyethylene, 10 to 15 parts of hydrogen-containing silicone oil, 15 to 35 parts of inorganic filler and 10 to 15 parts of reinforced fiber.

Description

Technical Field

[0001] The present invention relates to the technical field of cable materials, and discloses a fiber-reinforced cable protection pipe and a preparation method thereof. Background Technique

[0002] Electric wires and cables are carriers for power transmission and information transfer, and are widely used. In order to extend the service life of the cables and ensure their safety, cable protection pipes are often provided on the outermost layer. The cable protection pipes need to have good impact resistance, temperature resistance, tensile resistance, compressive resistance, etc. Polyethylene has excellent electrical insulation and good mechanical properties, and is one of the main raw materials for cable protection pipes. Polyvinyl chloride has good flame retardancy, weather resistance, and tensile resistance, but its toughness is poor and its impact resistance is insufficient. After blending polyethylene, polyvinyl chloride, and reinforcing fibers, a cable protection pipe material with excellent mechanical properties and both advantages can be obtained.

[0003] However, the flame retardancy of the cable protection pipe material obtained by blending needs to be improved, so a flame retardant needs to be added additionally, and the poor compatibility between the flame retardant and the matrix material will lead to problems such as a decrease in mechanical properties. In summary, it is of great significance to study a fiber-reinforced cable protection pipe with good mechanical properties and good flame retardancy and its preparation method. Summary of the Invention

[0004] The purpose of the present invention is to provide a fiber-reinforced cable protection pipe and a preparation method thereof to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the present invention provides the following technical solution: A preparation method of a fiber-reinforced cable protection pipe: including the following steps: Step 1: Take a flame retardant, hydroxyl-modified polyethylene, and a mixed solvent (DMF and DMSO with a volume ratio of 2:1), heat up to 150-160 °C, react for 10-12 h under nitrogen protection, remove the solvent, and obtain highly flame-retardant polyethylene;

[0006] Step 2: Take polyethylene, polyvinyl chloride, and highly flame-retardant polyethylene, mix them evenly, add hydrogen-containing silicone oil and a platinum catalyst, conduct vacuum melting and mixing at 160-165 °C for 10-12 h, add inorganic fillers, reinforcing fibers, and initiators, mix them evenly to obtain a mixture, extrude and mold at 190-200 °C in an extruder, cool and cut to obtain a cable protection pipe.

[0007] Preferably, the highly flame-retardant polyethylene includes the following raw materials, by mass: 8-10 parts of flame retardant, 20-30 parts of hydroxyl-modified polyethylene, and 100-150 parts of mixed solvent;

[0008] The cable protection pipe comprises the following raw materials in parts by mass: 60-70 parts of polyethylene, 15-20 parts of polyvinyl chloride, 15-20 parts of high flame-retardant polyethylene, 10-15 parts of hydrogen-containing silicone oil, 0.01-0.012 parts of platinum catalyst, 15-35 parts of inorganic filler, 10-15 parts of reinforcing fiber, and 0.1-1 part of initiator.

[0009] Preferably, the preparation of the flame retardant comprises the following steps: Take cyanuric chloride and potassium carbonate, add them to tetrahydrofuran and stir evenly, dropwise add a tetrahydrofuran solution containing 9-decen-1-ol and flame retardant ODOPB, stir at 30-35 °C for 15-18 h in an argon atmosphere, remove the solvent to obtain a reactant; Take the reactant and potassium carbonate, add them to tetrahydrofuran and stir evenly, dropwise add a tetrahydrofuran solution containing p-hydroxybenzaldehyde, stir at 30-35 °C for 15-18 h in an argon atmosphere, remove the solvent to obtain the flame retardant.

[0010] Preferably, the reactant comprises the following raw materials in parts by mass: 18-25 parts of cyanuric chloride, 5-8 parts of potassium carbonate, 15-20 parts of 9-decen-1-ol, 14-18 parts of flame retardant ODOPB; The flame retardant comprises the following raw materials in parts by mass: 55-60 parts of reactant, 3-4 parts of potassium carbonate, and 10-15 parts of p-hydroxybenzaldehyde.

[0011] Preferably, the preparation of the hydroxyl-modified polyethylene comprises the following steps: Take polyethylene, initiator, and 9-decen-1-ol, mix them evenly, heat to 90-115 °C and stir for 10-20 min, cool to room temperature to obtain hydroxyl-modified polyethylene.

[0012] Preferably, the hydroxyl-modified polyethylene comprises the following raw materials in parts by mass: 50-60 parts of polyethylene, 3-5 parts of initiator, and 10-15 parts of 9-decen-1-ol.

[0013] Preferably, the reinforcing fiber comprises one or more of glass fiber and carbon fiber.

[0014] Preferably, the inorganic filler comprises one or more of carbon black, white carbon black, mica powder, glass fiber, and glass microspheres.

[0015] Preferably, the inorganic filler is white carbon black and mica powder with a mass ratio of (10-20):(5-10).

[0016] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: Polyethylene has good mechanical properties, and polyvinyl chloride has good flame retardancy but poor impact resistance. After blending the two, a cable protection pipe material with good mechanical properties and good flame retardancy can be obtained. To improve the flame retardancy, highly flame-retardant polyethylene is further introduced, which is prepared from a flame retardant and hydroxyl-modified polyethylene: The flame retardant is based on cyanuric chloride, which itself has a certain flame retardancy. Its -Cl is used to introduce 9-decen-1-ol, flame retardant ODOPB, and p-hydroxybenzaldehyde. Among them, 9-decen-1-ol introduces a double bond structure, which can react with the hydrogen-containing silicone oil added in the subsequent steps to form a crosslinked network, improving the mechanical properties and compatibility while enhancing the performance; Flame retardant ODOPB is a phosphorus-based flame retardant, which acts together with cyanuric chloride to enhance the flame retardant effect; p-hydroxybenzaldehyde is introduced last, introducing an aldehyde group that can react with the hydroxyl-modified polyethylene chain, improving the problem of performance degradation caused by poor compatibility between traditional flame retardants and polymer material matrices; When preparing this flame retardant, the addition amounts of cyanuric chloride, 9-decen-1-ol, flame retardant ODOPB, and p-hydroxybenzaldehyde need to be controlled to ensure the smooth progress of grafting and obtain a flame retardant with good flame retardant effect and active groups that can participate in the subsequent step reactions;

[0017] The present invention also adds hydrogen-containing silicone oil and a platinum catalyst. The hydrogen-containing silicone oil itself has good oxidation resistance and heat resistance. Under the action of the catalyst, it can react and crosslink with the double bonds in the highly flame-retardant polyethylene to form a network structure, improving the agglomeration phenomenon in the mixture and enhancing the mechanical properties and impact resistance; Since the highly flame-retardant polyethylene chain segments of the present invention contain multiple double bonds, a better crosslinked structure can be obtained, further optimizing the performance; The addition ratios of the hydrogen-containing silicone oil and the highly flame-retardant polyethylene need to be controlled. Excessive addition will lead to compatibility problems on the one hand and excessive crosslinking on the other hand, resulting in a decline in performance. Detailed implementation manners

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0019] It should be noted that there are no special restrictions on the manufacturers from which the raw materials involved in the present invention are purchased. Exemplarily, they include: polyethylene purchased from Shanghai Yuanye, product number Y45330; polyvinyl chloride purchased from Shanghai Yuanye, product number S51649; hydrogen-containing silicone oil is the high-hydrogen-containing silicone oil of Jinan Shanhaichem Technology Co., Ltd., with a hydrogen content of ≥1.58%, and the product number is GHQGY01; platinum catalyst purchased from Hubei Weideli Chemical Reagent Co., Ltd., product number HBW-B245; silica white purchased from Yamei Nano, product number AM-SIO2-021-1; mica powder purchased from Shanghai Jieshikai Biotechnology, 600 mesh, product number KA615528; glass fiber purchased from Shanghai Yuanye, product number S30527; initiator is diisopropylbenzene peroxide, CAS number 80-43-3; the CAS number of 9-decen-1-ol is 13019-22-2; the CAS number of flame retardant ODOPB is 99208-50-1; the CAS number of cyanuric chloride is 108-77-0; the CAS number of potassium carbonate is 584-08-7; the CAS number of tetrahydrofuran is 109-99-9; the CAS number of p-hydroxybenzaldehyde is 123-08-0; the CAS number of DMF is 68-12-2; the CAS number of DMSO is 67-68-5;

[0020] Unless otherwise specified, the following are all in parts by mass and mass ratio;

[0021] Example 1: S1: Take 55 parts of polyethylene, 4 parts of initiator diisopropylbenzene peroxide, and 12 parts of 9-decen-1-ol, mix them evenly, heat to 95 °C, keep stirring for 18 min, and cool to room temperature to obtain hydroxyl-modified polyethylene;

[0022] S2: Take 20 parts of cyanuric chloride and 6 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly. Dropwise add a tetrahydrofuran (100 parts) solution containing 15 parts of 9-decen-1-ol and 15 parts of flame retardant ODOPB, and stir at 30 °C for 15 h in an argon atmosphere. Remove the solvent to obtain a reactant;

[0023] Take 60 parts of the reactant and 4 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly. Dropwise add a tetrahydrofuran (100 parts) solution containing 14 parts of p-hydroxybenzaldehyde, and stir at 35 °C for 18 h in an argon atmosphere. Remove the solvent to obtain a flame retardant;

[0024] S3: Take 10 parts of the flame retardant, 25 parts of hydroxyl-modified polyethylene, and 150 parts of a mixed solvent (DMF and DMSO with a volume ratio of 2:1), heat to 155 °C, and react for 12 h under nitrogen protection. Remove the solvent to obtain highly flame-retardant polyethylene;

[0025] S4: Take 60 parts of polyethylene, 18 parts of polyvinyl chloride, and 18 parts of highly flame-retardant polyethylene, mix them evenly, add 12 parts of hydrogen-containing silicone oil and 0.01 part of platinum catalyst, conduct vacuum melting and kneading at 160°C for 12 h, add 15 parts of silica, 8 parts of mica powder, 15 parts of glass fiber, and 0.2 part of initiator, mix them evenly to obtain a mixture, extrude and mold in an extruder, with the extrusion section temperature being 180°C and the extrusion head temperature being 190°C, cool and cut to obtain a cable protection pipe.

[0026] Example 2: S1: Take 50 parts of polyethylene, 3 parts of initiator dicumyl peroxide, and 10 parts of 9-decen-1-ol, mix them evenly, heat to 95°C, keep warm and stir for 18 min, cool to room temperature to obtain hydroxyl-modified polyethylene;

[0027] S2: Take 18 parts of cyanuric chloride and 5 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly, dropwise add a tetrahydrofuran (100 parts) solution containing 15 parts of 9-decen-1-ol and 14 parts of flame retardant ODOPB, stir at 30°C for 15 h in an argon atmosphere, remove the solvent to obtain a reactant;

[0028] Take 55 parts of the reactant and 3 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly, dropwise add a tetrahydrofuran (100 parts) solution containing 10 parts of p-hydroxybenzaldehyde, stir at 35°C for 18 h in an argon atmosphere, remove the solvent to obtain a flame retardant;

[0029] S3: Take 8 parts of the flame retardant, 20 parts of hydroxyl-modified polyethylene, and 100 parts of a mixed solvent (DMF and DMSO with a volume ratio of 2:1), heat to 155°C, react for 12 h under nitrogen protection, remove the solvent to obtain highly flame-retardant polyethylene;

[0030] S4: Take 60 parts of polyethylene, 20 parts of polyvinyl chloride, and 20 parts of highly flame-retardant polyethylene, mix them evenly, add 15 parts of hydrogen-containing silicone oil and 0.01 part of platinum catalyst, conduct vacuum melting and kneading at 160°C for 12 h, add 20 parts of silica, 10 parts of mica powder, 10 parts of glass fiber, and 0.2 part of initiator, mix them evenly to obtain a mixture, extrude and mold in an extruder, with the extrusion section temperature being 180°C and the extrusion head temperature being 190°C, cool and cut to obtain a cable protection pipe.

[0031] Example 3: S1: Take 60 parts of polyethylene, 5 parts of initiator dicumyl peroxide, and 15 parts of 9-decen-1-ol, mix them evenly, heat to 95°C, keep warm and stir for 18 min, cool to room temperature to obtain hydroxyl-modified polyethylene;

[0032] S2: Take 25 parts of cyanuric chloride and 8 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly. Dropwise add a tetrahydrofuran (100 parts) solution containing 20 parts of 9-decen-1-ol and 18 parts of flame retardant ODOPB. Stir at 30°C for 15 h in an argon atmosphere, remove the solvent, and obtain a reactant.

[0033] Take 60 parts of the reactant and 4 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly. Dropwise add a tetrahydrofuran (100 parts) solution containing 15 parts of p-hydroxybenzaldehyde. Stir at 35°C for 18 h in an argon atmosphere, remove the solvent, and obtain a flame retardant.

[0034] S3: Take 10 parts of the flame retardant, 30 parts of hydroxyl-modified polyethylene, and 150 parts of a mixed solvent (DMF and DMSO with a volume ratio of 2:1). Heat to 155°C and react for 12 h under nitrogen protection. Remove the solvent to obtain highly flame-retardant polyethylene.

[0035] S4: Take 70 parts of polyethylene, 20 parts of polyvinyl chloride, and 20 parts of highly flame-retardant polyethylene, mix them evenly, add 15 parts of hydrogen-containing silicone oil and 0.01 part of platinum catalyst, melt and mix in a vacuum at 160°C for 12 h. Add 10 parts of white carbon black, 10 parts of mica powder, 15 parts of glass fiber, and 0.2 part of initiator, mix evenly to obtain a mixture. Extrude and mold in an extruder. The temperature of the extrusion section is 180°C, and the temperature of the extrusion head is 190°C. Cool and cut to obtain a cable protection tube.

[0036] Example 4: S1: Take 55 parts of polyethylene, 4 parts of initiator diisopropylbenzene peroxide, and 12 parts of 9-decen-1-ol, mix them evenly, heat to 95°C, keep stirring for 18 min, and cool to room temperature to obtain hydroxyl-modified polyethylene.

[0037] S2: Take 20 parts of cyanuric chloride and 6 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly. Dropwise add a tetrahydrofuran (100 parts) solution containing 15 parts of 9-decen-1-ol and 15 parts of flame retardant ODOPB. Stir at 30°C for 15 h in an argon atmosphere, remove the solvent, and obtain a reactant.

[0038] Take 60 parts of the reactant and 4 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly. Dropwise add a tetrahydrofuran (100 parts) solution containing 14 parts of p-hydroxybenzaldehyde. Stir at 35°C for 18 h in an argon atmosphere, remove the solvent, and obtain a flame retardant.

[0039] S3: Take 10 parts of the flame retardant, 25 parts of hydroxyl-modified polyethylene, and 150 parts of a mixed solvent (DMF and DMSO with a volume ratio of 2:1). Heat to 155°C and react for 12 h under nitrogen protection. Remove the solvent to obtain highly flame-retardant polyethylene.

[0040] S4: Take 70 parts of polyethylene, 20 parts of polyvinyl chloride, and 20 parts of highly flame-retardant polyethylene, mix them evenly, add 15 parts of hydrogen-containing silicone oil and 0.01 part of platinum catalyst, conduct vacuum melting and mixing at 160 °C for 12 h, add 10 parts of silica, 10 parts of mica powder, 15 parts of glass fiber, and 0.2 part of initiator, mix them evenly to obtain a mixture, extrude and mold in an extruder, with the extrusion section temperature at 180 °C and the extrusion head temperature at 190 °C, cool and cut to obtain a cable protection tube.

[0041] Comparative Example 1 (without introducing hydrogen-containing silicone oil, changing the preparation method of the mixture, and the other method steps are the same as those in Example 1): S1: Take 55 parts of polyethylene, 4 parts of initiator dicumyl peroxide, and 12 parts of 9-decen-1-ol, mix them evenly, heat to 95 °C, keep warm and stir for 18 min, cool to room temperature to obtain hydroxyl-modified polyethylene;

[0042] S2: Take 20 parts of cyanuric chloride and 6 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly, dropwise add a tetrahydrofuran (100 parts) solution containing 15 parts of 9-decen-1-ol and 15 parts of flame retardant ODOPB, stir at 30 °C for 15 h in an argon atmosphere, remove the solvent to obtain a reactant;

[0043] Take 60 parts of the reactant and 4 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly, dropwise add a tetrahydrofuran (100 parts) solution containing 14 parts of p-hydroxybenzaldehyde, stir at 35 °C for 18 h in an argon atmosphere, remove the solvent to obtain a flame retardant;

[0044] S3: Take 10 parts of the flame retardant, 25 parts of hydroxyl-modified polyethylene, and 150 parts of a mixed solvent (DMF and DMSO with a volume ratio of 2:1), raise the temperature to 155 °C, react for 12 h under nitrogen protection, remove the solvent to obtain highly flame-retardant polyethylene;

[0045] S4: Take 60 parts of polyethylene, 18 parts of polyvinyl chloride, 18 parts of highly flame-retardant polyethylene, 15 parts of silica, 8 parts of mica powder, 15 parts of glass fiber, and 0.2 part of initiator, mix them evenly to obtain a mixture, extrude and mold in an extruder, with the extrusion section temperature at 180 °C and the extrusion head temperature at 190 °C, cool and cut to obtain a cable protection tube.

[0046] Comparative Example 2 (not compounding the flame retardant and polyethylene to obtain highly flame-retardant polyethylene, and the other method steps are the same as those in Example 1): S1: Take 20 parts of cyanuric chloride and 6 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly, dropwise add a tetrahydrofuran (100 parts) solution containing 15 parts of 9-decen-1-ol and 15 parts of flame retardant ODOPB, stir at 30 °C for 15 h in an argon atmosphere, remove the solvent to obtain a reactant;

[0047] S2: Take 60 parts of reactants and 4 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly. Dropwise add a solution of 14 parts of p-hydroxybenzaldehyde in tetrahydrofuran (100 parts). Stir at 35 °C for 18 h in an argon atmosphere, remove the solvent to obtain a flame retardant;

[0048] S3: Take 10 parts of the flame retardant and 25 parts of polyethylene, mix them evenly to obtain an additive;

[0049] S4: Take 60 parts of polyethylene, 18 parts of polyvinyl chloride, and 18 parts of the additive, mix them evenly, add 12 parts of hydrogen-containing silicone oil and 0.01 part of platinum catalyst, conduct vacuum melting and mixing at 160 °C for 12 h, add 15 parts of white carbon black, 8 parts of mica powder, 15 parts of glass fiber, and 0.2 part of initiator, mix them evenly to obtain a mixture, extrude and mold it in an extruder, the temperature of the extrusion section is 180 °C, the temperature of the extrusion head is 190 °C, cool and cut to obtain a cable protection pipe.

[0050] Comparative Example 3 (changing the addition amount of the raw materials of the flame retardant, and the remaining method steps are the same as those in Example 1): S1: Take 55 parts of polyethylene, 4 parts of initiator dicumyl peroxide, and 12 parts of 9-decen-1-ol, mix them evenly, heat to 95 °C, keep stirring for 18 min, and cool to room temperature to obtain hydroxyl-modified polyethylene;

[0051] S2: Take 20 parts of cyanuric chloride and 6 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly. Dropwise add a solution of 20 parts of 9-decen-1-ol and 15 parts of flame retardant ODOPB in tetrahydrofuran (100 parts). Stir at 30 °C for 15 h in an argon atmosphere, remove the solvent to obtain a reactant;

[0052] Take 60 parts of the reactant and 4 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly. Dropwise add a solution of 14 parts of p-hydroxybenzaldehyde in tetrahydrofuran (100 parts). Stir at 35 °C for 18 h in an argon atmosphere, remove the solvent to obtain a flame retardant;

[0053] S3: Take 10 parts of the flame retardant, 25 parts of hydroxyl-modified polyethylene, and 150 parts of a mixed solvent (DMF and DMSO with a volume ratio of 2:1), heat to 155 °C, and react for 12 h under nitrogen protection, remove the solvent to obtain highly flame-retardant polyethylene;

[0054] S4: Take 60 parts of polyethylene, 18 parts of polyvinyl chloride, and 18 parts of highly flame-retardant polyethylene, mix them evenly, add 12 parts of hydrogen-containing silicone oil and 0.01 part of platinum catalyst, conduct vacuum melting and mixing at 160 °C for 12 h, add 15 parts of white carbon black, 8 parts of mica powder, 15 parts of glass fiber, and 0.2 part of initiator, mix them evenly to obtain a mixture, extrude and mold it in an extruder, the temperature of the extrusion section is 180 °C, the temperature of the extrusion head is 190 °C, cool and cut to obtain a cable protection pipe.

[0055] Comparative Example 4 (changing the addition amounts of polyethylene, polyvinyl chloride, and highly flame-retardant polyethylene, and the remaining method steps are the same as those in Example 1): S1: Take 55 parts of polyethylene, 4 parts of initiator diisopropylbenzene peroxide, and 12 parts of 9-decen-1-ol, mix them evenly, heat to 95 °C, keep stirring for 18 min, and cool to room temperature to obtain hydroxyl-modified polyethylene;

[0056] S2: Take 20 parts of cyanuric chloride and 6 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly. Dropwise add a tetrahydrofuran (100 parts) solution containing 15 parts of 9-decen-1-ol and 15 parts of flame retardant ODOPB, and stir at 30 °C for 15 h in an argon atmosphere. Remove the solvent to obtain a reactant;

[0057] Take 60 parts of the reactant and 4 parts of potassium carbonate, add them to 500 parts of tetrahydrofuran and stir evenly. Dropwise add a tetrahydrofuran (100 parts) solution containing 14 parts of p-hydroxybenzaldehyde, and stir at 35 °C for 18 h in an argon atmosphere. Remove the solvent to obtain a flame retardant;

[0058] S3: Take 10 parts of the flame retardant, 25 parts of hydroxyl-modified polyethylene, and 150 parts of a mixed solvent (DMF and DMSO with a volume ratio of 2:1), heat to 155 °C, and react for 12 h under nitrogen protection. Remove the solvent to obtain highly flame-retardant polyethylene;

[0059] S4: Take 50 parts of polyethylene, 25 parts of polyvinyl chloride, and 30 parts of highly flame-retardant polyethylene, mix them evenly, add 12 parts of hydrogen-containing silicone oil and 0.01 part of platinum catalyst, melt and mix in a vacuum at 160 °C for 12 h, add 15 parts of white carbon black, 8 parts of mica powder, 15 parts of glass fiber, and 0.2 part of initiator, mix them evenly to obtain a mixture, extrude and mold it in an extruder. The temperature of the extrusion section is 180 °C, and the temperature of the extrusion head is 190 °C. Cool and cut to obtain a cable protection tube.

[0060] Performance test: Take the mixtures prepared in Examples 1 to 3 and Comparative Examples 1 to 4, extrude them in an extruder, extrude them into a mold for molding. The temperature of the extrusion section is 180 °C, and the temperature of the extrusion head is 190 °C to obtain samples; (1) Refer to "ISO180 Cantilever Beam Impact Strength, Notched Impact Strength" to measure the notched impact strength; (2) Refer to the national standard GT2406.2-2009 to test the oxygen index. The specific data are as follows in the table:

[0061]

[0062] Conclusion: In Comparative Example 1, hydrogen-containing silicone oil was not introduced and the preparation method of the mixture was changed, resulting in a significant decrease in performance; in Comparative Example 2, the flame retardant and polyethylene were not compounded, and the decrease in compatibility led to a decrease in overall performance; in Comparative Example 3, the raw material addition amount of the flame retardant was changed, and the addition amount of 9-decene-1-ol was increased. Due to the change in the structure of the flame retardant, the performance was inferior to that of the example; in Comparative Example 4, the addition amounts of polyethylene, polyvinyl chloride, and high flame-retardant polyethylene were changed, resulting in a decrease in performance. From this, the importance of controlling the addition amount can be seen; in summary, the fiber-reinforced cable protection pipe prepared by the present invention has good impact resistance and good flame retardancy.

[0063] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation method of a fiber-reinforced cable protection pipe, characterized in that: It includes the following Steps: Step 1: Take a flame retardant, hydroxyl-modified polyethylene, and a mixed solvent, heat up to 150 - 160 °C, react for 10 - 12 h under nitrogen protection, remove the solvent, and obtain highly flame-retardant polyethylene; Step 2: Take polyethylene, polyvinyl chloride, and highly flame-retardant polyethylene, mix them evenly, add hydrogen-containing silicone oil and a platinum catalyst, conduct vacuum melting and mixing at 160 - 165 °C for 10 - 12 h, add inorganic filler, reinforcing fiber, and initiator, mix them evenly to obtain a mixture, extrude and mold at 190 - 200 °C in an extruder, cool and cut to obtain a cable protection pipe.

2. The preparation method of a fiber-reinforced cable protection pipe according to claim 1, characterized in that: The highly flame-retardant polyethylene includes the following raw materials, by mass: 8 - 10 parts of flame retardant, 20 - 30 parts of hydroxyl-modified polyethylene, 100 - 150 parts of mixed solvent; The cable protection pipe includes the following raw materials, by mass: 60 - 70 parts of polyethylene, 15 - 20 parts of polyvinyl chloride, 15 - 20 parts of highly flame-retardant polyethylene, 10 - 15 parts of hydrogen-containing silicone oil, 0.01 - 0.012 parts of platinum catalyst, 15 - 35 parts of inorganic filler, 10 - 15 parts of reinforcing fiber, 0.1 - 1 part of initiator.

3. The preparation method of a fiber-reinforced cable protection pipe according to claim 1, characterized in that: The preparation of the flame retardant includes the following steps: Take cyanuric chloride and potassium carbonate, add them to tetrahydrofuran and stir evenly, dropwise add a tetrahydrofuran solution containing 9-decen-1-ol and flame retardant ODOPB, stir at 30 - 35 °C for 15 - 18 h in an argon atmosphere, remove the solvent to obtain a reactant; Take the reactant and potassium carbonate, add them to tetrahydrofuran and stir evenly, dropwise add a tetrahydrofuran solution containing p-hydroxybenzaldehyde, stir at 30 - 35 °C for 15 - 18 h in an argon atmosphere, remove the solvent to obtain the flame retardant.

4. The preparation method of a fiber-reinforced cable protection pipe according to claim 3, characterized in that: The reactant includes the following raw materials, by mass: 18 - 25 parts of cyanuric chloride, 5 - 8 parts of potassium carbonate, 15 - 20 parts of 9-decen-1-ol, 14 - 18 parts of flame retardant ODOPB; The flame retardant includes the following raw materials, by mass: 55 - 60 parts of reactant, 3 - 4 parts of potassium carbonate, 10 - 15 parts of p-hydroxybenzaldehyde.

5. The preparation method of a fiber-reinforced cable protection pipe according to claim 1, characterized in that: The preparation of the hydroxyl-modified polyethylene includes the following steps: Take polyethylene, initiator, and 9-decen-1-ol, mix them evenly, heat to 90 - 115 °C and stir for 10 - 20 min, cool to room temperature to obtain hydroxyl-modified polyethylene.

6. The preparation method of a fiber-reinforced cable protection pipe according to claim 5, characterized in that: The hydroxyl-modified polyethylene includes the following raw materials, by mass: 50 - 60 parts of polyethylene, 3 - 5 parts of initiator, 10 - 15 parts of 9-decen-1-ol.

7. The preparation method of a fiber-reinforced cable protection pipe according to claim 1, characterized in that: The reinforcing fiber includes one or more of glass fiber and carbon fiber.

8. The preparation method of a fiber-reinforced cable protection pipe according to claim 1, characterized in that: The inorganic filler includes one or more of carbon black, white carbon black, mica powder, glass fiber, and glass microspheres.

9. The preparation method of a fiber-reinforced cable protection pipe according to claim 8, characterized in that: The inorganic filler is white carbon black and mica powder with a mass ratio of (10 - 20):(5 - 10).

10. A cable protection pipe prepared by the preparation method of a fiber-reinforced cable protection pipe according to any one of claims 1 - 9.

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