Search

CN-121779918-B - High mechanical property barrier polyamide composite material and preparation method thereof

CN121779918BCN 121779918 BCN121779918 BCN 121779918BCN-121779918-B

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a high mechanical property barrier polyamide composite material and a preparation method thereof. The modified polyurethane modified long-chain aliphatic polyamide comprises, by weight, 80-90 parts of long-chain aliphatic polyamide, 10-20 parts of maleic anhydride grafting compatilizer, 8-16 parts of barrier agent and 0-6 parts of processing aid, wherein the barrier agent consists of pentaerythritol-based polyol, ethylene-acrylic acid ionomer and nano montmorillonite with the mass ratio of (0.05-0.2) to (0.4-0.8) to 1. The addition of pentaerythritol based polyol and ethylene-acrylic acid ionomer improves the dispersion properties of the nano montmorillonite, which is beneficial to forming a more perfect barrier network. Through the physical barrier of nano montmorillonite and the chemical bond densification effect of pentaerythritol-based polyol and ethylene-acrylic acid ionomer, double barriers are formed for gas molecules, permeability is obviously reduced, and the mechanical properties of the composite material are improved.

Inventors

  • LI WENXIAO
  • WANG XULIANG
  • ZHANG XIUJUN
  • ZHU YICHAO

Assignees

  • 烟台万华聚氨酯合成材料有限公司

Dates

Publication Date
20260508
Application Date
20260305

Claims (10)

  1. 1. The high mechanical property barrier polyamide composite material is characterized by comprising the following components in parts by weight: 80-90 parts of long-chain aliphatic polyamide, 10-20 parts of maleic anhydride grafting compatilizer, 8-16 parts of blocking agent and 0-6 parts of processing aid; The blocking agent consists of pentaerythritol based polyalcohol, ethylene-acrylic acid ionomer and nano montmorillonite with the mass ratio of (0.05-0.2) to (0.4-0.8) to 1.
  2. 2. The high mechanical barrier polyamide composite material of claim 1 wherein said long chain aliphatic polyamide is one or more of polyamide 610, polyamide 612, polyamide 1010, polyamide 11, polyamide 12, polyamide 1212, polyamide 1012.
  3. 3. A high mechanical barrier polyamide composite material as claimed in claim 1 wherein said maleic anhydride grafted compatibilizer is a maleic anhydride grafted olefin polymer.
  4. 4. The high mechanical property barrier polyamide composite material according to claim 1, wherein the maleic anhydride grafted compatilizer is one or more of maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, maleic anhydride grafted polystyrene, maleic anhydride grafted ethylene octene copolymer and maleic anhydride grafted ethylene propylene diene monomer.
  5. 5. The high mechanical barrier polyamide composite material of claim 1 wherein said pentaerythritol based polyol is one or more of monopentaerythritol, dipentaerythritol, tripentaerythritol.
  6. 6. A high mechanical barrier polyamide composite material as claimed in claim 1 wherein said ethylene acrylic acid ionomer is a sarin resin.
  7. 7. The high mechanical barrier polyamide composite material of claim 1, wherein said processing aid is one or more of a coupling agent, a lubricant, an antioxidant, a flow modifier, a mold release agent, a plasticizer, and a heat stabilizer.
  8. 8. The high mechanical property barrier polyamide composite material as claimed in claim 7, wherein the coupling agent is one or more of silane coupling agent, titanate coupling agent and aluminate coupling agent, and the antioxidant is one or more of hindered phenol antioxidant and phosphite antioxidant.
  9. 9. The method for preparing the high mechanical property barrier polyamide composite material as claimed in claim 1, which comprises the following steps: (1) Uniformly mixing long-chain aliphatic polyamide, a maleic anhydride grafting compatilizer, a blocking agent and a processing aid to obtain a mixture; (2) Adding the mixture into a double-screw extruder, and carrying out melting, extrusion and granulation to obtain the high mechanical property barrier polyamide composite material.
  10. 10. The method for preparing the high mechanical property barrier polyamide composite material as claimed in claim 9, wherein the screw speed of the twin-screw extruder is 200-500r/min, and the extrusion temperature is 200-300 ℃.

Description

High mechanical property barrier polyamide composite material and preparation method thereof Technical Field The invention belongs to the technical field of high polymer materials, and particularly relates to a high mechanical property barrier polyamide composite material and a preparation method thereof. Background The composite material is a new material which is formed by processing different materials such as organic high polymer, inorganic nonmetal or metal through proper compounding process, and the characteristics of the original components are related and supplemented with each other through design, so that the composite material has more excellent comprehensive performance. The environment-friendly, energy-saving and emission-reducing demands enable plastics to replace metals in more aspects so as to reduce the weight of automobiles, airplanes, ships and the like, thereby reducing the oil consumption. The polymer composite material has the advantages of low weight and high rigidity, and is widely applied to various fields of automobiles, airplanes, oceans, sports industry and the like. The thermoplastic composite material has higher modulus and strength, and the reinforced thermoplastic composite material replaces metal parts, so that the cost of the product can be reduced, and the weight of the product can be reduced. Because thermoplastic composite materials have been widely used in structural members as substitutes for metal materials having high fatigue strength, it is imperative to improve the long-term reliability of the composite materials and to increase the service life of the composite materials. Polyamides are a generic term for polymers containing recurring amide groups in the backbone. Polyamides are widely varied and are classified into aliphatic polyamides, semiaromatic polyamides and wholly aromatic polyamides in terms of structure. Depending on the synthetic monomers, aliphatic polyamides obtained by ring-opening polymerization of lactam monomers or by self-polycondensation of amino acids are often denoted PAn, such as PA6, PA11 and PA12, where n is the number of carbon atoms of the repeating unit structure, and aliphatic polyamides obtained by polycondensation of two monomers, a diacid and a diamine, are denoted PAmn, such as PA66, PA610 and PA612, where m is the number of carbon atoms of the diamine and n is the number of carbon atoms of the diacid. The polyamide has the characteristics of high mechanical strength, good wear resistance, excellent self-lubricating property, excellent chemical resistance and the like, and is easy to process and modify. Polyamide has been widely used in textile, automotive, electronic and electrical appliances, aerospace, construction, gas storage and other fields, and has become one of the very important synthetic material varieties in life. Among them, polyamide composites are used in gas transportation in many cases. The application of the plastic liner composite material hydrogen storage bottle can improve the economic benefit of the tube bundle container, but the large length-diameter ratio hydrogen storage bottle has the characteristics of long bottle body and weak rigidity. In recent years, with the development of new energy sources, barrier materials made of polyamide have received increasing attention. The Chinese patent CN117430943A discloses an ultrahigh hydrogen barrier nylon-based composite material for a hydrogen storage bottle and a preparation method thereof, which are used for solving the technical problems that the hydrogen barrier performance of the nylon-based composite material needs to be further improved and the mechanical property of the nylon-based composite material which is applied to a hydrogen bottle is poor in the prior art, and the ultrahigh hydrogen barrier nylon-based composite material for the hydrogen storage bottle is prepared by preparing a composite adhesive film from modified nylon, a crosslinking additive, polystyrene, polypropylene and an auxiliary additive according to the dosage ratio of 11g to 2g to 4g to 1g, and completely immersing the composite adhesive film into a beaker filled with a composite dispersion liquid for modification treatment. Not only effectively improves the hydrogen gas barrier property of the nylon-based composite material, but also improves the mechanical property of the nylon-based composite material, so that the nylon-based composite material has good durability and stability when applied to a hydrogen cylinder. However, the technology has complex preparation process and higher cost, and limits the industrialized application of the technology. Disclosure of Invention In view of the above, the invention provides a high mechanical property barrier polyamide composite material and a preparation method thereof, and the composite material not only has excellent mechanical property, but also has higher gas barrier property, can be used as a gas cylinder material, and expands the applicati