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Preparation method of nylon material with flame retardance

A flame retardant, nylon technology

Inactive Publication Date: 2020-07-28
SUZHOU RUNJIA ENGINEER PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current conventional practice is to add flame retardants to nylon for modification, but the current flame retardants mostly contain phosphorus or halogens, which have an impact on the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A preparation method of a nylon material with flame retardant properties, comprising the following steps:

[0019] (1) Weigh 100 parts by mass of nylon, 10 parts by mass of microcapsule mannitol, 6 parts by mass of anhydrous magnesium carbonate, and 8 parts by mass of calcium chloride, and mix them uniformly; meanwhile, weigh 10 parts by mass of glass fiber.

[0020] Among them: nylon is medium-viscosity nylon 6; the flow rate of nylon 6 is 1.5-4.0g / 10min under the condition of 235 ℃ and 2.16kg load; glass fiber is glass fiber with oval cross-section, and its density is 2.2-2.66 g / cm 3 Calcium chloride is a kind of Lewis acid, and its addition can produce complex reaction with nylon, thereby limit the movement of nylon molecular chain, make the crystallinity of nylon hinder, thereby reduce the shrinkage rate of the injection molded part of nylon; Microcapsule mannitol is The structure of mannitol wrapped in silica is obtained by sol-gel method; mannitol is a medium-tem...

Embodiment 2

[0025] A preparation method of a nylon material with flame retardant properties, comprising the following steps:

[0026] (1) Weigh 100 parts by mass of nylon, 5 parts by mass of microcapsule mannitol, 10 parts by mass of anhydrous magnesium carbonate, and 7 parts by mass of calcium chloride, and mix them uniformly; meanwhile, weigh 20 parts by mass of glass fiber.

[0027] (2) Heat the mixture obtained in step (1) to 210° C. and knead with a kneader for 60 min, and the kneader speed is 42 rpm.

[0028] (3) Mix the mixture obtained in step (2) and glass fiber and pass it into a twin-screw extruder for melt extrusion; wherein, the temperature of each working area of ​​the extruder is: 230°C in the first zone, 235°C in the second zone, and 235°C in the third zone 235°C, 240°C in the fourth zone, 240°C in the fifth zone, 245°C in the sixth zone, 245°C in the seventh zone, 250°C in the eighth zone, 250°C in the ninth zone, and 245°C in the tenth zone; the twin-screw speed is 250rp...

Embodiment 3

[0031] A preparation method of a nylon material with flame retardant properties, comprising the following steps:

[0032] (1) Weigh 100 parts by mass of nylon, 8 parts by mass of microcapsule mannitol, 12 parts by mass of anhydrous magnesium carbonate, and 5 parts by mass of calcium chloride, and mix them uniformly; meanwhile, weigh 12 parts by mass of glass fiber.

[0033] (2) Heat the mixture obtained in step (1) to 220°C and knead with a kneader for 30 min, and the kneader speed is 42 rpm.

[0034] (3) Mix the mixture obtained in step (2) and glass fiber and pass it into a twin-screw extruder for melt extrusion; wherein, the temperature of each working area of ​​the extruder is: 230°C in the first zone, 235°C in the second zone, and 235°C in the third zone 235°C, 240°C in the fourth zone, 240°C in the fifth zone, 245°C in the sixth zone, 245°C in the seventh zone, 250°C in the eighth zone, 250°C in the ninth zone, and 245°C in the tenth zone; the twin-screw speed is 250rpm....

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Abstract

The invention relates to a preparation method of a nylon material with flame retardance. The preparation method comprises the following steps (1) weighing nylon, microcapsule mannitol, anhydrous magnesium carbonate and calcium chloride, mixing and weighing glass fibers, (2) heating and kneading the mixture, (3) carrying out melt extrusion on the kneaded mixture and the glass fibers, and (4) cooling the blank to obtain a finished product. According to the method, microcapsule mannitol and anhydrous magnesium carbonate which do not contain phosphorus and halogen are introduced, so that the nylonmaterial has flame retardance, the microcapsule mannitol can reduce the temperature around the nylon through phase change heat absorption to hinder combustion, the anhydrous magnesium carbonate can absorb heat during combustion and is decomposed to generate carbon dioxide, and the oxygen concentration around the nylon material is reduced, so that a flame-retardant effect is achieved.

Description

technical field [0001] The invention relates to the field of nylon materials, in particular to a method for preparing nylon materials with flame-retardant properties. Background technique [0002] Nylon, also known as polyamide, is a good thermoplastic material; due to its excellent characteristics such as high strength, oil resistance, chemical resistance, self-lubrication, shock resistance, noise resistance, easy processing, recyclability, and sufficient sources, it is widely used in automobiles. There are more and more applications on the Internet; at present, nylon materials are often used around the battery pack of automobile engines or new energy vehicles; because they are close to heating elements, nylon materials for automobiles are required to have excellent flame retardancy. The current conventional practice is to add flame retardants to nylon for modification, but the current flame retardants mostly contain phosphorus or halogens, which have an impact on the envir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08K13/06C08K9/10C08K5/053C08K7/14C08K3/26C08K3/16
CPCC08K13/06C08K9/10C08K5/053C08K7/14C08K3/26C08K3/16C08K2003/267C08K2003/162C08L2201/02C08L77/02
Inventor 汪理文李庆贵刘正军翁永华丁贤麟
Owner SUZHOU RUNJIA ENGINEER PLASTIC
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