Search

CN-122011593-A - Reinforced and toughened CM square power corrugated pipe and preparation method thereof

CN122011593ACN 122011593 ACN122011593 ACN 122011593ACN-122011593-A

Abstract

The invention discloses a reinforced and toughened CM square electric corrugated pipe and a preparation method thereof, belongs to the technical field of electric power pipe preparation, and is used for solving the technical problem that the impact resistance and flame retardance of the square electric corrugated pipe in the prior art are required to be further improved; according to the invention, the PI-Si hybrid resin, the modified aramid fiber reinforcement and the P-N-Si modified flaky core-shell mica structure are sequentially prepared, a multi-scale collaborative interface system consisting of a matrix phase, a reinforcement phase and an inorganic lamellar layer is constructed, and the system realizes collaborative regulation and control of chain segment movement, interface combination and lamellar barrier behavior in the forming process, so that stress transmission is more continuous, an energy dissipation path is more graded, interface polarization and local heat accumulation are obviously reduced, and therefore, the obtained square electric corrugated pipe has structural improvement in the aspects of mechanical property, wear resistance, thermal dimensional stability, flame retardance, insulating property and the like.

Inventors

  • LU XIUTING
  • LI BAIHUA
  • XU WENJING
  • YU GUOSHEN
  • LIN LINGLING

Assignees

  • 杭州富阳科威钢业有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (8)

  1. 1. A CM square electric corrugated pipe with reinforced and toughened performance is prepared from polypropylene resin, PI-Si hybridized resin, modified aramid fibre reinforcement, P-N-Si modified flaky core-shell mica, antioxidizing agent 1010, antioxidizing agent 168 and calcium stearate through fully mixing, smelting, extruding out, stirring while adding the pre-polyamide acid dispersion in reactor, adding 3- (2, 3-glycidoxy) propyl trimethoxy silane after uniformly mixing, then heating a reaction kettle to 40-50 ℃, keeping the temperature and stirring for 2-3 hours to obtain siloxane modified polyamic acid dispersoid, adding the siloxane modified polyamic acid dispersoid and the modifying liquid into the reaction kettle and stirring, heating the reaction kettle to 120-140 ℃ after uniformly mixing, keeping the temperature for 1-2 hours, heating the reaction kettle to 170-190 ℃ and keeping the temperature for 2-4 hours, and performing aftertreatment to obtain PI-Si hybrid resin; The preparation method comprises the steps of cooling a reaction kettle to 0-5 ℃, adding p-phenylenediamine, lithium chloride, calcium chloride and N-methyl-2-pyrrolidone into the reaction kettle, stirring, continuously adding calculated amount of 4,4' -biphenyl acetyl chloride and anhydrous sodium carbonate in ten batches after uniformly mixing, heating the reaction kettle to 20-30 ℃ after the addition is finished at an addition interval of 10-12min, keeping the temperature and stirring for 3-4h to obtain an aramid pre-polymerization resin dispersion liquid, adding 4-hydroxy-4 ' -cyanobiphenyl, N ' -dicyclohexylcarbodiimide, 4-dimethylaminopyridine and N-methyl-2-pyrrolidone into the reaction kettle, stirring, adding the aramid pre-polymerization resin dispersion liquid after uniformly mixing, stirring for 2-3h at room temperature, heating the reaction kettle to 60-80 ℃, keeping the temperature and stirring for 2-4h, and performing post-treatment to obtain a modified aramid reinforcement; The reinforced and toughened CM square electric corrugated pipe is obtained by fully mixing 100 parts by weight of polypropylene resin, 25-35 parts by weight of PI-Si hybrid resin, 10-15 parts by weight of modified aramid fiber reinforcement, 20-25 parts by weight of P-N-Si modified flaky core-shell mica, 0.1-0.2 part by weight of antioxidant 1010, 0.1-0.2 part by weight of antioxidant 168 and 0.2-0.4 part by weight of calcium stearate, and then carrying out melt extrusion molding.
  2. 2. The reinforced and toughened CM square electric corrugated pipe according to claim 1, wherein the polyamide acid prepolymer dispersion, glacial acetic acid, deionized water and 3- (2, 3-epoxypropoxy) propyl trimethoxysilane are mixed according to the dosage ratio of 80mL:1.5mL:2-3mL:3-4mL, the siloxane modified polyamide acid dispersion and the modifying solution are mixed according to the dosage ratio of 80mL:40-45mL, and the modifying solution is obtained by mixing acetic anhydride and pyridine according to the dosage ratio of 40-50mL:2-3 mL.
  3. 3. The CM square electric corrugated pipe for strengthening and toughening according to claim 2, wherein the preparation method of the polyamic acid prepolymer dispersion is characterized in that 4,4' -oxydiphenylamine and N-methyl-2-pyrrolidone are added into a reaction kettle for stirring, the reaction kettle is cooled to 0-5 ℃ after uniform mixing, calculated 3,3', 4' -biphenyl tetracarboxylic dianhydride is added in ten batches, the feeding interval is 10-15min, the reaction kettle is heated to 20-30 ℃ after the feeding is finished, the temperature is kept for stirring for 3-4h, and the obtained materials are collected after stirring is finished, so as to obtain the polyamic acid prepolymer dispersion.
  4. 4. The CM square electric corrugated pipe with reinforcement and toughness according to claim 3, wherein the ratio of the 4,4' -oxydiphenylamine to the N-methyl-2-pyrrolidone is 10-12 g/100 ml in the preparation of the polyamic acid prepolymer dispersion, and the addition amount of 3,3', 4' -biphenyltetracarboxylic dianhydride is 0.40-0.45 times the molar amount of amino groups in the reaction system.
  5. 5. The reinforced and toughened CM square electric corrugated pipe according to claim 1, wherein the dosage ratio of p-phenylenediamine, lithium chloride, calcium chloride, N-methyl-2-pyrrolidone and anhydrous sodium carbonate is 8-10mL:3-4g:2-3g:100mL:2g, wherein the addition amount of 4,4' -biphenyl acetyl chloride is 0.55-0.60 times the molar amount of amino in a reaction system, and the dosage ratio of the 4-hydroxy-4 ' -cyanobiphenyl, N ' -dicyclohexylcarbodiimide, 4-dimethylaminopyridine, N-methyl-2-pyrrolidone and aramid pre-polymer resin dispersion is 5-6g:6-7g:0.5-0.6g:30-40 mL.
  6. 6. The reinforced and toughened CM square electric corrugated pipe according to claim 1, wherein the preparation method of the P-N-Si modified flaky core-shell mica is characterized in that phlogopite and absolute ethyl alcohol are added into a reaction kettle to be stirred, hexachlorocyclotriphosphazene and 9, 10-dihydro-9-oxo-10-phosphaphenanthrene-10-oxide are sequentially added after uniform dispersion, 3-aminopropyl triethoxysilane and deionized water are then added, triethylamine is added to adjust the pH=8-9 of a reaction system, the reaction kettle is heated to 60-80 ℃, the temperature is kept and stirred for 4-6 hours, and the P-N-Si modified flaky core-shell mica is obtained after post treatment.
  7. 7. The CM square electric corrugated pipe with reinforcement and toughness according to claim 6, wherein in the process of preparing the P-N-Si modified flaky core-shell mica, the dosage ratio of phlogopite, absolute ethyl alcohol, hexachlorocyclotriphosphazene, 9, 10-dihydro-9-oxo-10-phosphaphenanthrene-10-oxide, 3-aminopropyl triethoxysilane and deionized water is 15-18 g/100 mL/4-5 g/6 g/8-10 mL/4-6 mL.
  8. 8. The method for manufacturing the reinforced and toughened CM square electric corrugated pipe according to any one of claims 1 to 7, comprising the steps of: Adding polypropylene resin, PI-Si hybrid resin, modified aramid fiber reinforcement, P-N-Si modified flaky core-shell mica, antioxidant 1010, antioxidant 168 and calcium stearate into a stirring kettle, uniformly mixing to obtain a mixture, adding the mixture into a double-screw extruder, carrying out melt extrusion for shaping, and cooling and traction to obtain the square electric corrugated pipe.

Description

Reinforced and toughened CM square power corrugated pipe and preparation method thereof Technical Field The invention relates to the technical field of power tube manufacturing, in particular to a reinforced and toughened CM square power corrugated tube and a manufacturing method thereof. Background The square power corrugated pipe is mainly applied to the protection and laying of power cables, a material system is generally composed of thermoplastic resin, reinforcing fibers or inorganic fillers and flame retardant and modified components, polyolefin, polyamide or polyester resin is often adopted as a matrix in the industry to meet the requirements of bending adaptability, mechanical bearing and wear resistance in power engineering, glass fibers, aramid fibers and sheet inorganic materials are matched to improve structural strength and stability, and the cable protection material also needs to have good thermal dimensional stability and insulating property in a long-term operating environment, so that the heat resistance, flame retardance and dielectric characteristics are generally improved by adding flame retardants, inorganic sheet materials or polarity regulators. However, the conventional square electric corrugated pipe process still has obvious defects in the aspects of multi-performance synergism of mechanics, thermal response, electric insulation and the like, the traditional system is dependent on simple combination of resin, reinforcement and flame retardant filler, the interface structure of the traditional system lacks hierarchical regulation and control, so that stress is difficult to effectively transfer and disperse under the action of external force, cracks are easy to rapidly expand, the impact resistance and the wear resistance of the material are difficult to simultaneously improve, in a thermal environment, conventional flame retardant and heat resistant measures mainly depend on additives or inorganic filler, but a formed barrier structure is discontinuous, chain segment relaxation, volume shrinkage and thermal deformation are still easy to occur at high temperature, and the dimensional stability is insufficient. Meanwhile, under the condition of an electric field, the existing insulating filler provides a macroscopic dielectric barrier, and the interface region of the resin and the reinforcement is still easy to generate dipole response and local electric field concentration, so that a carrier migration path is short, interface polarization is obvious, and the overall insulating uniformity and long-term electrical stability of the system are affected. The actual technical defect situation makes the traditional material difficult to obtain comprehensive performance with mechanical, flame-retardant and insulating properties in a complex service environment, and therefore a solution is provided. Disclosure of Invention The invention aims to provide a reinforced and toughened CM square power corrugated pipe and a preparation method thereof, which are used for solving the technical problem that the shock resistance and flame retardant performance of the square power corrugated pipe in the prior art are required to be further improved. The invention aims at realizing the technical scheme that the reinforced and toughened CM square electric corrugated pipe comprises the following raw materials, by weight, 100 parts of polypropylene resin, 25-35 parts of PI-Si hybrid resin, 10-15 parts of modified aramid fiber reinforcement, 20-25 parts of P-N-Si modified flaky core-shell mica, 0.1-0.2 part of antioxidant 1010, 0.1-0.2 part of antioxidant 168 and 0.2-0.4 part of calcium stearate; the PI-Si hybrid resin is prepared by the following method: A1, adding the polyamic acid prepolymer dispersion into a reaction kettle, stirring, sequentially adding glacial acetic acid and deionized water, adding 3- (2, 3-glycidoxy) propyl trimethoxy silane after uniformly mixing, then heating the reaction kettle to 40-50 ℃, and carrying out heat preservation and stirring for 2-3 hours to obtain a siloxane modified polyamic acid dispersion; A2, adding the siloxane modified polyamide acid dispersoid and the modified liquid into a reaction kettle, stirring, heating the reaction kettle to 120-140 ℃ after uniform mixing, preserving heat for 1-2h, heating to 170-190 ℃ and preserving heat for 2-4h, and performing post treatment to obtain the PI-Si hybrid resin. The reaction principle for preparing the PI-Si hybrid resin is as follows: The trimethoxy silane group of 3- (2, 3-epoxypropoxy) propyl trimethoxy silane is firstly hydrolyzed to generate silanol in the presence of water, then Si-O-Si bond is formed through condensation reaction between silanol, thereby constructing siloxane network structure, meanwhile, epoxy group on 3- (2, 3-epoxypropoxy) propyl trimethoxy silane molecule is nucleophilic ring-opening reacted by amino group on polyamide acid chain segment, beta-amine alcohol structure containing hydroxyl is introd