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CN-121991503-A - High-heat-resistance high-toughness PA11T composite material and preparation method thereof

CN121991503ACN 121991503 ACN121991503 ACN 121991503ACN-121991503-A

Abstract

The invention relates to the technical field of nylon materials, in particular to a high heat-resistant high-toughness PA11T composite material and a preparation method thereof, wherein the high heat-resistant high-toughness PA11T composite material comprises, by weight, 90-110 parts of PA11T resin, 10-30 parts of chopped carbon fibers, 5-10 parts of hyperbranched polymers, 3-7 parts of modified carbon nanotubes and 4-8 parts of compatilizer. The high heat-resistant high-toughness PA11T composite material prepared by the invention has excellent heat resistance and toughness.

Inventors

  • HE MIN
  • ZHOU XUN

Assignees

  • 广东艾利特新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260305

Claims (10)

  1. 1. The PA11T composite material with high heat resistance and high toughness is characterized by comprising, by weight, 90-110 parts of PA11T resin, 10-30 parts of chopped carbon fiber, 5-10 parts of hyperbranched polymer, 3-7 parts of modified carbon nanotubes and 4-8 parts of compatilizer.
  2. 2. The high heat resistant high toughness PA11T composite according to claim 1, wherein the chopped carbon fiber has a length of 3-6mm and a diameter of 5-10 μm.
  3. 3. The high heat-resistant high-toughness PA11T composite material according to claim 1, wherein the hyperbranched polymer is one or more of hyperbranched polyester, hyperbranched polyamide and hyperbranched polyethylene.
  4. 4. The high heat resistant high toughness PA11T composite material according to claim 1, wherein the preparation method of the modified carbon nanotubes comprises the steps of: Adding a carbon nano tube into dichloromethane, cooling to 0-5 ℃, regulating the rotating speed to 500-600rpm, adding anhydrous AlCl 3 , and carrying out ultrasonic treatment for 20-40min to obtain a mixed solution; A2, pouring the mixture obtained in the step A1 into dilute hydrochloric acid at the temperature of 0-5 ℃, stirring for 3-5min, sequentially washing with dilute hydrochloric acid, deionized water, ethanol and acetone for multiple times after suction filtration until filtrate is neutral and no chloride ion is detected, and drying to obtain the pretreated carbon nanotube; A3, adding the pretreated carbon nano tube obtained in the step A2 and 3-methoxypropylamine into N, N-dimethylformamide, heating to 40-60 ℃, adding an activating agent and a catalyst, reacting for 12-24 hours, filtering, washing and drying to obtain the modified carbon nano tube.
  5. 5. The high heat resistant and high toughness PA11T composite material according to claim 4, wherein the mass ratio of the carbon nanotubes to anhydrous AlCl 3 is 1 (0.001-0.005).
  6. 6. The PA11T composite material with high heat resistance and high toughness according to claim 4, wherein the acid anhydride reagent is maleic anhydride and/or trimesic anhydride.
  7. 7. The high heat resistance and high toughness PA11T composite material according to claim 4, wherein the mass ratio of the carbon nanotubes to the acid anhydride reagent is 1 (0.5-1).
  8. 8. The high heat resistant and high toughness PA11T composite according to claim 4, wherein the mass ratio of the pretreated carbon nanotubes and 3-methoxypropylamine in step A3 is 1 (0.3-0.7).
  9. 9. The high heat resistance and high toughness PA11T composite material according to claim 1, wherein the compatilizer is one or more of POE-g-GMA, EBA-g-GMA, EMA-g-GMA, POE-g-MAH and EPDM-g-MAH.
  10. 10. A method for preparing the high heat resistance and high toughness PA11T composite material according to any one of claims 1-9, comprising the steps of: S1, premixing PA11T resin, hyperbranched polymer, modified carbon nano tube and compatilizer in a high-speed mixer for 5-10min to obtain a premixed material; S2, adding the premixed material obtained in the step S1 and the chopped carbon fibers into a double-screw extruder for extrusion granulation, wherein the feeding speed of the double-screw extruder is 200-300rpm, the extrusion temperature is 290-320 ℃, and the PA11T composite material is obtained through water cooling, air drying and granulating.

Description

High-heat-resistance high-toughness PA11T composite material and preparation method thereof Technical Field The invention relates to the technical field of nylon materials, in particular to a high-heat-resistance high-toughness PA11T composite material and a preparation method thereof. Background The PA11T is formed by polycondensation of 1, 11-diaminoundecane and terephthalic acid, and belongs to high-temperature-resistant long-carbon-chain semi-aromatic polyamide. The polyamide has the advantages of retaining the mechanical strength, wear resistance and chemical corrosion resistance of polyamide, having low water absorption, high dimensional stability and basic heat resistance due to the introduction of a benzene ring structure, and being a potential key material in high-end fields such as electronic and electrical appliances, automobile manufacturing, aerospace and the like. However, pure PA11T still has the problems of difficulty in balancing heat resistance and toughness, low molecular weight, easiness in yellowing and degradation of PA11T prepared by a traditional melt polycondensation method, high cost of the solution polycondensation method, poor compatibility of the blending modified composite material filler and a matrix and the like, and needs to be solved. The patent CN106543718B discloses a high-strength and high-temperature-resistant nylon composite material which comprises, by weight, 78-98.5 parts of high-temperature-resistant nylon matrix resin, 1-20 parts of toughening modifier and 0.5-2 parts of antioxidant. The star-shaped nylon with specific single-arm molecular weight and specific molecular structure and containing ether bond as a core is adopted as the toughening modifier to be added into the high-temperature-resistant nylon matrix resin, so that on one hand, the melt fluidity of the high-temperature-resistant nylon matrix resin can be improved, on the other hand, the toughness of the high-temperature-resistant nylon matrix resin can be increased, and the preparation method is simple and easy to industrialize. However, the toughness of nylon resin is enhanced by the deformation and stress transmission of ether bond, which may impair the heat-resistant property and mechanical strength of the matrix. Patent CN106147224A discloses a high-temperature resistant and heat-conducting nylon composite material which comprises, by weight, 100 parts of PA66,40-80 parts of high-temperature resistant nylon, 10-50 parts of nylon elastomer, 10-30 parts of carbon fiber, 20-50 parts of heat-conducting filler, 0.2-1.5 parts of reactive flow modifier, 0.3-1.2 parts of antioxidant and 0.3-2 parts of lubricant. The high-temperature resistant nylon is one or a combination of more than one of PA9T, PA, T, PA, 11 and T, PA T, the reactive flow modifier is three-in-Sanstab and 2303, and the heat conducting filler is one or a combination of more than one of aluminum oxide, aluminum nitride, boron nitride, silicon carbide and graphite. The material has the characteristics of excellent high temperature resistance, excellent heat conductivity, good mechanical property and easiness in processing. However, the formulation contains extremely high inorganic filler and carbon fiber filling amount, which may cause problems of greatly increased density, reduced toughness, narrowed processing window and the like of the composite material. Therefore, there is a need in the market for PA11T composites with high heat resistance and high toughness. Disclosure of Invention Aiming at the problems in the prior art, the invention aims to obtain the PA11T composite material with excellent heat resistance and toughness. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the invention provides a high heat-resistant high-toughness PA11T composite material which comprises, by weight, 90-110 parts of PA11T resin, 10-30 parts of chopped carbon fibers, 5-10 parts of hyperbranched polymers, 3-7 parts of modified carbon nanotubes, 4-8 parts of compatilizer and 0.5-2 parts of antioxidant. According to the application, the PA11T composite material is obtained by compounding the PA11T resin, the chopped carbon fiber, the hyperbranched polymer, the modified carbon nanotube and the compatilizer, and has excellent heat resistance and toughness. In some embodiments, the chopped carbon fibers have a length of 3-6mm and a diameter of 5-10 μm. In some embodiments, the hyperbranched polymer is one or more of hyperbranched polyesters, hyperbranched polyamides, hyperbranched polyethylenes. Preferably, the hyperbranched polymer is a hyperbranched polyamide. In some embodiments, the method of preparing the modified carbon nanotubes comprises the steps of: Adding a carbon nano tube into dichloromethane, cooling to 0-5 ℃, regulating the rotating speed to 500-600rpm, adding anhydrous AlCl 3, and carrying out ultrasonic treatment for 20-40min to obtain a mixed solution; A2, pouring the mixture obtained in the