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Flame-retardant chain-extending nylon 6 composition and preparation method thereof

A technology of composition and nylon, which is applied in the field of polymer material modification, can solve problems such as uneven dispersion, large amount of composite flame retardants, and decreased tensile strength of flame retardant materials, so as to increase the molecular weight and improve the mechanical properties of materials , good flame retardant effect

Inactive Publication Date: 2014-07-02
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tang Linsheng et al. (Tang Linsheng, Liu Quanmei, Li Yongqiang, etc. The flame retardant effect of new phosphorus nitrogen flame retardants on nylon 6 [J]. Plastic Industry, 2011,39(8):110-113) studied the flame retardant effect of propyl hypophosphorous acid The phosphorus-nitrogen flame retardant compounded with aluminum and melamine cyanurate at a mass ratio of 3:1 is flame-retardant PA6. When the mass fraction is 25%, the limiting oxygen index of PA6 increases from 21.2% to 30.2%, reaching GB / T2408 vertical combustion FV -02mm, but the composite flame retardant is added in a large amount and is unevenly dispersed in the PA6 matrix. Compared with pure PA6, the tensile strength of the flame retardant material is reduced by 16.6%.

Method used

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  • Flame-retardant chain-extending nylon 6 composition and preparation method thereof
  • Flame-retardant chain-extending nylon 6 composition and preparation method thereof
  • Flame-retardant chain-extending nylon 6 composition and preparation method thereof

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Embodiment 1

[0024] The total amount of control is 1000g, according to mass percentage (recorded as wt%), 85.6wt% PA6, 13wt% aluminum diethylphosphinate, 1wt% P-PAP-EP, 0.3wt% antioxidant B225 and 0.1wt% % Stearic acid is added to a high-speed mixer, stirred and mixed evenly at room temperature, melted, kneaded, extruded, cooled, pelletized and dried by a twin-screw extruder to obtain flame-retardant chain-extended nylon 6 composition pellets. The model of the twin-screw extruder used is LTE26 / 40 (LabTech, Germany). The temperature of each zone of the screw barrel is the first zone: 180°C, the second zone: 235°C, the third zone: 240°C, and the fourth zone: 240°C, the fifth zone: 240°C, the sixth zone: 240°C, the seventh zone: 240°C, the eighth zone: 240°C, the ninth zone: 240°C, the head: 245°C, the feeding speed is 25r / min, the host speed is 180r / min.

[0025] The ratio of each raw material was changed, and the flame-retardant chain-extended nylon 6 composition pellets of Examples 2-6 o...

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Abstract

The invention discloses a flame-retardant chain-extending nylon 6 composition and a preparation method thereof. The raw material formula of the flame-retardant chain-extending nylon 6 composition comprises the following components by mass percent: 85-85.7% of nylon 6, 14-14.5% of composite flame retardant, 0.1-0.3% of antioxidant and 0.1-0.2% of lubricating agent, wherein the composite flame retardant is a mixture of aluminum diethylphosphinate and a phosphorous epoxy compound P-EP; the phosphorous epoxy compound P-EP accounts for 7-22% of the mass percent of the composite flame retardant. The flame-retardant chain-extending PA6 composition disclosed by the invention has a good synergistic flame-retardant effect on PA6 by using the composite flame retardant of the phosphorous epoxy compound P-EP and the aluminum diethylphosphinate, and has a chain-extending and viscosifying action on PA6, the total dosage of the flame retardant rating achieving UL-94V-0@1.6mm is lower than the dosage of independent aluminum diethylphosphinate flame retardant, and the mechanical property is obviously improved.

Description

technical field [0001] The invention relates to nylon 6, in particular to a flame-retardant chain-extended nylon 6 composition and a preparation method thereof, belonging to the technical field of polymer material modification. Background of the invention [0002] Nylon 6 (PA6), as one of engineering plastics, has good comprehensive properties and is widely used in the fields of electronics, transportation, building materials, automobiles, and machinery. However, unmodified PA6 is flammable, releases a lot of heat when burned, and produces toxic gases and molten droplets. Therefore, the flame-retardant modification of PA6, especially the environmental-friendly flame-retardant modification, has always been a major problem that urgently needs to be solved in the application field of PA6. Phosphorus-containing flame retardants have a certain flame-retardant effect on PA6, especially the flame-retardant effect of aluminum phosphinate (phosphinate) is particularly prominent, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08K5/5313C08K5/098C08K5/09C08K5/53
CPCC08K5/00C08K5/09C08K5/098C08K5/53C08K5/5313C08L2201/02C08L77/02
Inventor 赵建青郑丽君刘述梅袁彦超赵颖
Owner SOUTH CHINA UNIV OF TECH
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