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High-performance flame-retardant cable sheath material and preparation method thereof

A cable sheath, flame-retardant technology, applied in the field of low-smoke, halogen-free, high-performance flame-retardant cable sheath materials

Inactive Publication Date: 2014-11-26
上海三承高分子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] There is still room for improvement in the oxygen index of existing flame-retardant cable sheath materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Embodiment 1. Preparation of high-performance flame-retardant cable sheath material one

[0072] (1) 45 parts of Al(OH) 3 with 15 parts of Mg(OH) 2 Dry the powder at 110°C for 10 hours, put it into a high-speed mixer, heat it to 70-90°C, dilute 1.4 parts of the coupling agent with ethanol at a volume ratio of 1:1 and spray it on the powder, keep stirring for about 1 hour, and then process The liquid is filtered, dried and ground to obtain surface-treated Al(OH) 3 and Mg(OH) 2 .

[0073] (2) Weigh 31 parts of EVA-28 and stir evenly in a high-speed mixer, then add the previously treated flame retardant, then add 0.7 parts of silicone, 1.8 parts of calcium stearate lubricant and 0.1 part of Antioxidant B-215 and 5 parts of compatibilizer, the stirring temperature in a high-speed kneader does not exceed 80 degrees, and the stirring time is not less than 20 minutes.

[0074] (3) Put the stirred material into a vented twin-screw extruder to extrude and granulate. When g...

Embodiment 2

[0075] Embodiment 2. Preparation two of high-performance flame-retardant cable sheath material

[0076] (1) First, 44 parts of Al(OH) 3 with 22 parts of Mg(OH) 2 Dry the powder at 110°C for 10 hours, put it into a high-speed mixer, heat it to 70-90°C, dilute it with ethanol at a volume ratio of 1:1 and spray 0.8 parts of coupling agent on the powder, keep stirring for about 1 hour, and then process The liquid is filtered, dried and ground to obtain surface-treated Al(OH) 3 and Mg(OH) 2 .

[0077] (2) Weigh 25 parts of EVA-28 and stir evenly in a high-speed mixer, then add the previously treated flame retardant, then add 1.0 parts of silicone and 2.1 parts of calcium stearate lubricant and 0.1 parts of Antioxidant B-215 and 5 parts of compatibilizer, the stirring temperature in a high-speed kneader does not exceed 80 degrees, and the stirring time is not less than 20 minutes.

[0078] (3) Put the stirred material into a vented twin-screw extruder to extrude and granulate. ...

Embodiment 3

[0079] Example 3. Verification that the ultra-high oxygen index high-performance flame-retardant cable sheath material has excellent flame-retardant properties

[0080] (1) Experimental principle

[0081]When a substance burns, it needs to consume a large amount of oxygen, different combustibles. The amount of oxygen consumed during combustion is different. By measuring the minimum amount of oxygen consumed in the combustion process of a substance, the oxygen index value of the substance can be calculated to evaluate the combustion performance of the substance. The so-called oxygen index (Oxygen index) refers to the minimum oxygen concentration required for the sample to maintain stable combustion (that is, flame combustion) in the oxygen-nitrogen mixed flow under the specified test conditions, expressed as the volume percentage of oxygen (that is, after the substance is ignited, it can maintain a burning length of 50 mm or a burning time of 3 minutes, the minimum volume perc...

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Abstract

The invention discloses a high-performance flame-retardant cable sheath material and a preparation method thereof. The material comprises the following components in percentage by mass: 25-35% of matrix resin (ethylene-vinyl acetate copolymer (EVA) resin), 55-60% of flame retardant, 0.5-1.5% of coupling agent, 2.5-3.5% of lubricant, 0.1-0.2% of antioxidant and 5-10% of compatilizer. The matrix resin is an ethylene-vinyl acetate copolymer (EVA) resin; the flame retardant comprises Mg(OH)2 and Al(OH)3; the coupling agent is a silane coupling agent; the lubricant comprises silicone and calcium stearate; the antioxidant is B-215; and the compatilizer is maleic anhydride graft. The flame-retardant cable sheath material disclosed by the invention is suitable to be used as an external sheath material of an information transmission cable for rail transportation, and has the advantages of excellent flame-retardant function, ultrahigh oxygen index and higher physical properties; and the oxygen index is up to 40, which is much higher than the flame-retardancy oxygen index of not higher than 30 in industry. The preparation method has the advantages of simple and economical preparation technique, environmental protection and energy saving, and has broad market prospects.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a low-smoke, halogen-free, high-performance flame-retardant cable sheath material. Background technique [0002] According to statistics, during the 15 years from 1999 to 2013 in my country, a total of 1,633,500 fires occurred across the country, of which 384,200 were caused by electrical cables, accounting for 23.52% of the total number of fires. In 2013, a total of 52,100 electrical cable fires occurred nationwide, accounting for 32.51% of the total number of fires. The cable fires in civil or public facilities occupy the first place of all kinds of fires in terms of the number of occurrences and direct economic losses. In these fires, the toxic gas emitted by the cables caused by the fire caused a large number of casualties. At the same time as flame retardant, smoke suppression treatment must be carried out, so that the plastic can achieve the dual purposes of flame retarda...

Claims

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Application Information

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IPC IPC(8): C08L31/04C08K3/22C08K5/5415C08K5/098C08L51/06H01B7/295H01B3/44
Inventor 熊小勇张宇
Owner 上海三承高分子材料科技有限公司
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