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Polyamide resin composite material, and preparation method and application thereof

A polyamide resin and composite material technology, applied in the field of flame retardant materials, can solve the problems of affecting dimensional stability, reducing water absorption, poor surface of products, etc., achieve good appearance, improve flame retardant performance, and good flame retardant effect

Active Publication Date: 2017-05-10
JIANGMEN DENGZHONGTAI ENG PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the benzene ring structure in the molecular chain of semi-aromatic polyamide, its water absorption rate is reduced to a certain extent, and its temperature resistance and strength are improved. Therefore, its material strength is higher, and its dimensional stability is improved under high temperature and high humidity conditions, but Poor product surface
[0004] The surface and strength of aliphatic and semi-aromatic polyamide composite materials can meet the requirements of use, but because aliphatic polyamide has the disadvantage of high water absorption, it seriously affects the composite material of aliphatic and semi-aromatic polyamide The dimensional stability of the product limits its application

Method used

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  • Polyamide resin composite material, and preparation method and application thereof

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[0052] The present invention also provides a preparation method of the polyamide resin composite material described in the above technical solution, comprising the following steps:

[0053] (1) mixing the semi-aromatic polyamide with a flame retardant additive to obtain a mixed resin, the flame retardant additive being zinc borate and / or antimony trioxide;

[0054] (2) kneading the mixed resin obtained in the step (1) with glass fibers and a halogen-free flame retardant to obtain a mixed material;

[0055] (3) extruding the mixed material obtained in the step (2) to obtain a polyamide resin composite material.

[0056] The invention mixes the semi-aromatic polyamide and the flame retardant additive to obtain the mixed resin, and the flame retardant additive is zinc borate and / or antimony trioxide. In the present invention, there is no special limitation on the mixing operation, and the technical solutions for preparing mixed materials well known to those skilled in the art ca...

Embodiment 1

[0067] Add A g terephthalic acid, B g adipic acid, C g isophthalic acid, D g dodecane binary Amine and E g1,6-hexamethylenediamine, add 7kg of deionized water, heat at 60°C to form a salt, after the salt solution is clarified, adjust the pH between 7.5-7.8, let it stand for 1h, and then heat the obtained polyamide salt solution Concentrate to 70 wt%.

[0068] Add 200g of acetic acid and 45g of sodium phosphate to the concentrated polyamide salt solution, heat up to 220°C after purging with nitrogen, and increase the pressure to 4.5MPa for pre-polymerization. After 6 hours of polymerization, reduce the pressure to normal pressure and continue vacuuming After 1 hour of reaction, discharge. The prepolymer was dried in a vacuum drying oven for 10 hours, and then polycondensed for 5 hours under vacuum at 200° C. to obtain a semi-aromatic polyamide resin.

[0069] When A is 1992g, B is 2628g, C is 0g, D is 0g, and E is 3480g, PA66 / 6T is obtained with a melting point of 280°C;

[...

Embodiment 2

[0074] PA66 / 6T, PA6I / 6T and PA12T / 12I were prepared by the same method as Comparative Document 1. Using 7.44kg PA66 / 6T, 22.32kg PA6I / 6T, 7.44kg PA12T / 12I, 50kg 301HF, 10kg OP1230, and 1kg zinc borate as raw materials, first dry the semi-aromatic polyamide in a vacuum drying oven at 120°C for 4 hours, and deblock The materials other than the fuel and the reinforcing agent are mixed evenly and then fed into the twin-screw extruder from the main hopper, the reinforcing agent is added from the first side feeder, and the flame retardant is added from the second side feeder. After kneading at 330°C in the machine, extrude at 250-310°C, water-cool the strands, cut into columnar particles with a pelletizer, and dry at 120°C in a vacuum oven for 4 hours to obtain a polyamide resin composite material.

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Abstract

The invention provides a polyamide resin composite material, and a preparation method and application thereof. The flowability of the polyamide resin composite material is enhanced through the semi-aromatic polyamide with lower melting point, thereby improving the defect of poor surface in the semi-aromatic polyamide. The p-phenyldiformyldihexyldiamine-m-phenyldiformyldihexyldiamine copolyamide (PA12T-12I) with longer molecular chain lowers the water absorptivity of the material; and the hexamethylene adipamipe-p-phenyldiformylhexamethylenediamine copolyamide (PA66 / 6T) and m-phenyldiformylhexamethylenediamine-p-phenyldiformylhexamethylenediamine copolyamide (PA6I / 6T) with favorable strength and rigidity enhance the rigidity of the material. Glass fibers are used as a reinforcing material to enhance the strength of the resin material. The halogen-free flame retardant and flame-retardant aid are matched to enhance the flame retardancy.

Description

technical field [0001] The invention relates to the technical field of flame retardant materials, in particular to a polyamide resin composite material and its preparation method and application. Background technique [0002] Polyamide (PA), commonly known as nylon, is a general term for thermoplastic resins containing repeated amide groups on the main chain of the molecule. It has excellent mechanical properties, friction and wear properties, self-lubricating properties, shock absorption and noise reduction, and is resistant to oil, alkali, and weak acids. and general organic solvents. Based on the above advantages, PA is currently the most widely used engineering plastic variety, and is widely used in electronics, automobiles, home appliances, sporting goods and other fields. In recent years, with the improvement of plastic requirements in the fields of electronics, automobiles, aerospace, military industry, and chemical industry, the appearance, strength, flame retardanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08K13/04C08K7/14C08K3/38C08K3/22
CPCC08L77/06C08L2201/02C08L2201/22C08L2203/20C08L2205/025C08L2205/03C08K13/04C08K7/14C08K2003/387C08K3/2279
Inventor 金良文梁永华郑红专
Owner JIANGMEN DENGZHONGTAI ENG PLASTICS CO LTD
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