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CN-122011755-A - High-toughness composite material for high jump cross rod and preparation method thereof

CN122011755ACN 122011755 ACN122011755 ACN 122011755ACN-122011755-A

Abstract

The invention discloses a high-toughness composite material for a high jump cross rod and a preparation method thereof, and belongs to the technical field of polyamide materials. The high-toughness composite material comprises, by weight, 60-85 parts of PA6 resin, 5-10 parts of a toughening agent, 1-5 parts of an antioxidant, 2-4 parts of a compatilizer, 10-12 parts of carbon fibers and 0.5-1 part of a lubricant, and the high-toughness composite material prepared by the method has excellent tensile strength, elongation at break, notch impact strength and ageing resistance.

Inventors

  • YAO LIYING
  • PAN MINGZHU
  • HUANG LIXUAN
  • CHEN QIAN

Assignees

  • 广州大学

Dates

Publication Date
20260512
Application Date
20260323

Claims (9)

  1. 1. The high-toughness composite material for the high jump cross rod is characterized by comprising the following raw materials in parts by weight: 60-85 parts of PA6 resin, 5-10 parts of toughening agent, 1-5 parts of antioxidant, 2-4 parts of compatilizer, 10-12 parts of carbon fiber and 0.5-1 part of lubricant; the toughening agent is prepared by the following method: S1, glycyl-cysteamine reacts with 6-hydroxycaproic acid to generate a diamide compound, S2, 9C,11 TR-conjugated methyl linoleate reacts under the action of sodium hydride to generate tetraolefin compound, S3, the bisamide compound reacts with the tetraolefin compound to generate a quadrifilar compound, And S4, reacting the quadrifilar compound with maleimide-octapolyethylene glycol-carboxylic acid to generate the toughening agent.
  2. 2. The high-toughness composite for high jump beams according to claim 1, wherein in step S1, the feeding molar ratio of glycyl-cysteamine to 6-hydroxycaproic acid is (1.05-1.1): 1.
  3. 3. The high-toughness composite for high jump beams according to claim 1, wherein in step S3, the feeding molar ratio of the bisamide compound to the tetraolefin compound is (4.02-4.1): 1.
  4. 4. The high-toughness composite for high jump beams according to claim 1, wherein in the step S4, the feeding mole ratio of the four-arm compound to the maleimide-octapolyethylene glycol-carboxylic acid is 1 (4.05-4.1).
  5. 5. The high toughness composite for high jump beams according to claim 1, wherein the antioxidant is prepared by the following method: A1, reacting methyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate under the action of sodium hydride to generate bisphenol compound, A2, the bisphenol compound reacts with 4, 4'' - (1, 3, 5-triazine-2, 4, 6-triyl) triphenylamine to generate the antioxidant.
  6. 6. The high-toughness composite for high jump beams according to claim 5, wherein in the step A1, the feeding mole ratio of 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) methyl propionate to sodium hydride is 1:1.2, and in the step A2, the feeding mole ratio of the bis-hindered phenol compound to 4, 4'' - (1, 3, 5-triazine-2, 4, 6-triyl) triphenylamine is 3.2:1.
  7. 7. The high toughness composite for high jump beams according to claim 1, wherein said compatibilizer is a maleic anhydride grafted polyolefin elastomer.
  8. 8. The high toughness composite for high jump beams according to claim 1, wherein the lubricant is one of ethylene bis stearamide, stearamide and oleamide.
  9. 9. A method of preparing a high toughness composite for a high jump beam as defined in any one of claims 1 to 9, comprising the steps of: (1) Weighing 60-85 parts of PA6 resin, 5-10 parts of toughening agent, 1-5 parts of antioxidant, 2-4 parts of compatilizer, 10-12 parts of carbon fiber and 0.5-1 part of lubricant according to parts by weight; (2) Adding PA6 resin and a toughening agent into a high-speed mixer, mixing for 20-30min at 90-100 ℃, heating to 110-120 ℃, adding an antioxidant, a compatilizer, carbon fibers and a lubricant, uniformly mixing, conveying to a double-screw extruder for melt mixing, and carrying out air cooling and sieving to obtain the high-toughness composite material.

Description

High-toughness composite material for high jump cross rod and preparation method thereof Technical Field The invention relates to the technical field of polyamide materials, in particular to a high-toughness composite material for a high jump cross rod and a preparation method thereof. Background The high jump cross bar is used as an important component of track and field sports equipment, and the material performance of the high jump cross bar is directly related to the game safety and the service life. The existing high jump cross rod is made of polyamide materials, glass fiber reinforced resin or common polycarbonate, but has a plurality of problems in long-term use and outdoor environment. Firstly, the cross bar frequently bears bending deformation and instantaneous impact in training or competition, the material needs to have higher bending toughness and breaking elongation, however, under the influence of high crystallinity and molecular chain regularity, the conventional polyamide material is easy to generate brittle fracture, stress cracking or microcrack in the repeated bending process, thereby reducing the safety and stability of equipment. In addition, when the cross bar impacts the ground, the crack resistance expansion capability of the traditional material is insufficient, and the requirement of a high-strength training environment is difficult to meet. Secondly, the high jump cross rod is mostly used for outdoor places, and is subjected to combined action of illumination, oxygen and humidity for a long time, so that the material is extremely easy to oxidize and degrade. Under the action of high temperature and ultraviolet light, the polyamide material can generate molecular chain fracture, end group oxidation and free radical chain reaction, so that the cross rod has aging phenomena such as yellowing, strength reduction, toughness reduction and the like. In addition, common micromolecular antioxidants are easy to migrate and volatilize in a polyamide system, so that the long-term protection effect is insufficient, the continuous oxidation under a complex environment is difficult to resist, the stress concentration position is easier to accelerate aging, and the service life is shortened. The Chinese patent publication No. CN102311640A discloses a carbon fiber reinforced polyamide composite material and a preparation method thereof, wherein the composite material comprises, by mass, 60-80% of polyamide, 0.1-0.3% of lubricant, 0.1-0.3% of antioxidant and 20-40% of carbon fiber, and has excellent notch impact strength, but tensile property and ageing resistance are required to be improved. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a high-toughness composite material for a high jump cross rod and a preparation method thereof. In order to achieve the above object, the present invention is realized by the following technical scheme: the high-toughness composite material for the high jump cross rod comprises the following raw materials in parts by weight: 60-85 parts of PA6 resin, 5-10 parts of toughening agent, 1-5 parts of antioxidant, 2-4 parts of compatilizer, 10-12 parts of carbon fiber and 0.5-1 part of lubricant; the toughening agent is prepared by the following method: S1, glycyl-cysteamine reacts with 6-hydroxycaproic acid to generate a diamide compound, S2, 9C,11 TR-conjugated methyl linoleate reacts under the action of sodium hydride to generate tetraolefin compound, S3, the bisamide compound reacts with the tetraolefin compound to generate a quadrifilar compound, S4, reacting the four-arm compound with maleimide-octapolyethylene glycol-carboxylic acid to generate a toughening agent; In the step S1, the feeding molar ratio of the glycyl-cysteamine to the 6-hydroxycaproic acid is (1.05-1.1): 1. In the step S3, the feeding molar ratio of the bisamide compound to the tetraene compound is (4.02-4.1): 1. In the step S4, the feeding molar ratio of the four-arm compound to the maleimide-octapolyethylene glycol-carboxylic acid is 1 (4.05-4.1). The antioxidant is prepared by the following method: A1, reacting methyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate under the action of sodium hydride to generate bisphenol compound, A2, the bisphenol compound reacts with 4, 4'' - (1, 3, 5-triazine-2, 4, 6-triyl) triphenylamine to generate the antioxidant. In the step A1, the feeding molar ratio of the methyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate to the sodium hydride is 1:1.2. In the step A2, the feeding molar ratio of the bisphenol compound to the 4, 4'' - (1, 3, 5-triazine-2, 4, 6-triyl) triphenylamine is 3.2:1. The compatibilizer is a maleic anhydride grafted polyolefin elastomer. The lubricant is one of ethylene bis-stearamide, stearamide and oleamide. A preparation method of a high-toughness composite material for a high jump cross rod comprises the following steps: (1) Weighing 60-85 parts of PA6 resin, 5-10 parts of to