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A kind of preparation method of flame retardant polyamide material

A technology for flame retardant polyamide and melamine, which is applied in the field of flame retardant polyamide materials and their preparation, can solve the problems of increased production cost of polyamide, decreased mechanical properties of polyamide, large amount of flame retardant added, and the like, and achieves flame retardant properties. Excellent performance and mechanical properties, improving flame retardant efficiency, and simplifying the effect of the process

Inactive Publication Date: 2016-04-20
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the problem of uniform dispersion of MCA in the matrix resin, and the secondary processing of the nylon 66 matrix is ​​affected by the mechanical properties of the material
Most of the flame-retardant polyamide materials reported in other literatures use filled flame retardants. Due to the large amount of flame retardants added in this method, the uneven distribution during the extrusion process is likely to cause agglomeration. In addition, the secondary heating of the matrix leads to the loss of the final material. The mechanical properties are lower than that of polyamide, which is generally only suitable for the field of plastics; at the same time, because of the secondary molding process of the subsequent screw, the production cost of polyamide is also increased, which increases the cost of raw materials for production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In parts by weight, drop 3.21 parts of melamine, 3.29 parts of cyanuric acid, 3 parts of deionized water, 89.5 parts of nylon 66 monomer hexamethylenediamine adipate and form a solution, 1 part of SiO 2 Mix evenly, then put it into the polymerization kettle, heat up to 220°C after melting and stirring, raise the pressure to 1.8Mpa, keep the pressure for 0.5 hours, then continue to heat up to 250°C and slowly discharge the gas, and then use a vacuum pump to vacuum to -0.1Mpa after normal pressure , heated again to 270°C for half an hour for polycondensation, returned to normal pressure, and then discharged and pelletized to obtain flame-retardant nylon 66 slices. After drying, flame-retardant nylon 66 was prepared by solid-state polycondensation at 220°C for 12 hours. The flame-retardant performance of the sample was good.

Embodiment 2

[0028] In parts by weight, 4.69 parts of melamine, 4.81 parts of cyanuric acid, 6 parts of deionized water, 82.5 parts of nylon 6 monomer caprolactam, 2 parts of Fe 2 o 3 Mix evenly, then put it into a polymerization kettle, heat up to 220°C with melting and stirring, and raise the pressure to 0.9Mpa, continue to heat up to 250°C for 2 hours, then slowly discharge the gas, post-condense at normal pressure for 3 hours, and let it stand for 20 minutes before discharging and cutting Flame-retardant nylon 6 slices were prepared from pellets, and flame-retardant nylon 6 was prepared by solid-state polycondensation at 210°C for 36 hours after extraction and drying. The vertical combustion performance of the sample was UL-94V-0.

Embodiment 3

[0030] In parts by weight, 3.95 parts of melamine, 4.06 parts of cyanuric acid, 4 parts of deionized water, 1 part of TiO 2 , 86.99 parts of nylon 66 monomer hexamethylenediamine adipate and mixed evenly into a solution, then put it into the polymerization kettle, melt and stir, then heat up to 210°C, and the pressure rises to 2.0Mpa, keep the pressure for 0.5 hours, and then continue to heat up to 250°C and slowly discharge the gas, after waiting for normal pressure, use a vacuum pump to evacuate to -0.1Mpa, heat up again to 270°C for polycondensation for 40 minutes, return to normal pressure, discharge and pelletize, and prepare slices of flame-retardant nylon 66 and nylon 6. After drying, the flame-retardant nylon was prepared by solid-state polycondensation at 230°C for 24 hours, and the flame-retardant performance of the sample reached the UL-94V-0 level.

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Abstract

The invention relates to a preparation method of a fire-retardant polyamide material. Melamine and cyanuric acid are taken as the fire-retardant monomers, MCA is formed in-situ by melamine and cyanuric acid during the polyamide monomer polymerization process and the fire-retardant polyamide material is prepared. Assisting fire-retardant agent SiO2 and nano metal oxidations are added during the polymerization process to further improve the fire-retardant efficiency. In-situ formed MCA has a certain length-diameter ratio, and evenly disperses in the substrate. Finally, the polymer viscosity is increased and the mechanic performances of the polymer rare improved through solid-state polymerization.

Description

technical field [0001] The invention relates to a method for preparing a flame-retardant polyamide material, in particular to a flame-retardant polymer in which melamine and cyanuric acid are flame retardant monomers and MCA is formed in situ from melamine and cyanuric acid during the polymerization of polyamide monomers. Amide materials and methods for their preparation. Background technique [0002] Polyamide, commonly known as nylon, is a variety of polymer materials with high melting point, good rigidity, high strength, oil resistance and wear resistance, etc. It can be used to manufacture various parts of machinery, automobiles, chemicals, and electrical and electronic devices. In the history of the development of polyamide engineering plastics, the output ranked first among the five major engineering plastics for quite a long time. At the same time, polyamide fiber is also one of the earliest industrially produced synthetic fibers in the world. However, the limiting ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/16C08G69/30C08K5/3492C08K3/22C08K3/36
Inventor 肖茹扈钰龙沙凯何珺怡陶磊王华平
Owner DONGHUA UNIV
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