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Flame-retardant polypropylene microporous film and preparation method thereof

A technology of flame-retardant polypropylene and polypropylene-based film, which is applied in the direction of electrical components, circuits, battery components, etc., to achieve the effects of reducing fire, good wettability, and improving safety performance

Active Publication Date: 2015-09-30
上海安凸塑料添加剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the field of polyolefin porous membranes, there are no reports of flame retardant membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of flame retardant polypropylene: Weigh 95wt% polypropylene, 3wt% aluminum hypophosphite, and 2wt% melamine polyphosphate, mix the above components uniformly in a high-speed mixer, and then add them to the twin-screw extruder In the extruder, the screw temperature of each section of the extruder is controlled between 180 and 220°C. The above materials are melted and extruded by the twin-screw extruder, and then water-cooled and then pulled and pelletized to obtain flame-retardant polypropylene.

[0024] Preparation of flame-retardant polypropylene microporous film: Add the obtained flame-retardant polypropylene pellets into a single-screw extruder with a diameter of 45mm and an aspect ratio of 25, and melt and extrude at 200°C. The flame retardant polypropylene base film was prepared by stretching under the condition of 150°C. Then the film was annealed at 130°C for 30 minutes, and the annealed film was uniaxially stretched at 50°C with a stretch ratio of 2....

Embodiment 2

[0026] Preparation of flame-retardant polypropylene: Weigh 93wt% polypropylene, 5wt% aluminum hypophosphite, 2wt% melamine hydrobromide, mix the above components uniformly at high speed in a high-speed mixer, and then add them to the twin-screw extruder In the extruder, the screw temperature of each section of the extruder is controlled between 180 and 220°C. The above-mentioned materials are melted and extruded by the twin-screw extruder, and then water-cooled and then drawn and pelletized to obtain flame-retardant polypropylene.

[0027] Preparation of flame-retardant polypropylene microporous film: Add the obtained flame-retardant polypropylene pellets to a single-screw extruder with a diameter of 45mm and an aspect ratio of 25, and melt-extrude at 195°C with a melt draw ratio of 200 The flame retardant polypropylene base film was stretched under certain conditions. Then the film was annealed at 120°C for 45 minutes, and the annealed film was uniaxially stretched at 80°C wi...

Embodiment 3

[0029] Preparation of flame-retardant polypropylene: Weigh 94wt% polypropylene and 6wt% aluminum hypophosphite, mix the above components uniformly in a high-speed mixer, and then add them to a twin-screw extruder. The temperature of the first stage screw is controlled between 180 and 220°C. The above-mentioned materials are melted and extruded by a twin-screw extruder, and then water-cooled and then drawn and pelletized to obtain flame-retardant polypropylene.

[0030] Preparation of flame-retardant polypropylene microporous film: Add the obtained flame-retardant polypropylene pellets to a single-screw extruder with a diameter of 45mm and an aspect ratio of 25, and melt-extrude at 200°C with a melt draw ratio of 250 The flame retardant polypropylene base film was stretched under certain conditions. Then the film was annealed at 135°C for 20 minutes, and the annealed film was uniaxially stretched at 40°C with a stretch ratio of 1.5, and finally the film was set at 140°C for 5 m...

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Abstract

The invention relates to a flame-resistant polypropylene microporous membrane and a preparation method thereof. The method comprises the following steps of: performing single-screw melting extrusion and rapid drawing on flame-resistant polypropylene, thereby obtaining a flame-resistant polypropylene base membrane; performing an annealing treatment on the base membrane; then performing the secondary drawing; and finally performing heat-molding, thereby obtaining the flame-resistant polypropylene microporous membrane. The flame-resistant polypropylene comprises the following components in parts by weight: 93 to 99 parts of polypropylene, 0.5 to 6 parts of aluminum hypophosphite and 0 to 3 parts of melamine derivative. The invention further discloses the preparation method of the flame-resistant polypropylene microporous membrane. Compared with the prior art, the flame-resistant polypropylene microporous membrane has the following advantages: the membrane thickness of the flame-resistant polypropylene microporous membrane ranges from 15 to 50mu; the porosity ranges from 35% to 55%; and the flame-resistant level can reach UL94VTM-2. The flame-resistant polypropylene microporous membrane has good wettability with an electrolyte and has good heat-resistant performance, thereby being served as a battery diaphragm.

Description

technical field [0001] The invention belongs to the field of functional polymer films, in particular to a flame-retardant polypropylene microporous film and a preparation method thereof. Background technique [0002] Since its appearance in the 1990s, lithium-ion batteries have developed rapidly due to their excellent electrical properties such as high specific capacity, small size, light weight, no memory, long cycle life, and high voltage. Has been widely used in mobile phones, portable computers, cameras, video cameras and other electronic products. Lithium-ion batteries are currently the first choice for power batteries in my country. [0003] The diaphragm plays a role in preventing the short circuit of the positive and negative electrodes in the lithium battery, and provides a lithium ion transport channel during the charging and discharging process of the lithium battery. The current commercialized lithium battery separators are mainly polyolefin microporous membran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08K3/32C08K5/3492B29C47/92B29C55/04H01M2/16B29C48/92
CPCB29C47/92B29C2947/92885B29C2947/92704B29C48/40B29C48/92B29C2948/92704B29C2948/92885
Inventor 付常俊董会丛杨玉成王文明燕洪
Owner 上海安凸塑料添加剂有限公司