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Flame-retardant PC (Poly Carbonate)/ABC composite material capable of shielding high-frequency electromagnetic wave and preparation method thereof

A composite material, electromagnetic wave technology, applied in the field of flame retardant PC/ABS composite material and its preparation, can solve the problems of limited use field, less than 40dB shielding efficiency, limited application, etc., and is conducive to universal popularization and application, and the preparation method is simple. Mature, improved mechanical properties

Active Publication Date: 2015-01-07
SILVER AGE ENG PLASTICS DONGGUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conductive carbon black system has the disadvantages of large addition amount and low shielding efficiency. Chen Xiaoyan, Dong Faqin and others pointed out in the article "Preparation and Performance Research of Carbon Black / Carbon Fiber / ABS Electromagnetic Shielding Composite Materials" published in 2010 , ABS was modified with 20% conductive carbon black, and the shielding effectiveness was found to be less than 10dB
In addition, carbon fiber also has the disadvantage of a large amount of addition, and like conductive carbon black, it can only be made into black parts, which greatly limits its application, especially when its addition amount is 20%, the shielding effect is less than 40dB
Although nickel, copper, iron, silver powder or fiber has the advantages of high shielding efficiency and small addition amount, it is the current mainstream trend, but nickel and copper are easy to oxidize, and the service life is greatly reduced; silver powder or fiber is not easy to oxidize and the addition amount is small, but Its price is too high; while iron powder / or fiber (including stainless steel) is cheap, but its shielding effect is lower than that of copper and silver. At present, it has been mass-produced at home and abroad, but the shielding effect is limited, especially for high-frequency electromagnetic wave shielding The effect is average, and the field of use is currently limited
[0004] In addition, the flame retardancy of PC / ABS composite materials is mainly achieved by adding decabromodiphenylethane, brominated polycarbonate, RDP, sulfonate, etc. However, due to the addition of electromagnetic shielding materials, flame retardancy is more difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The preparation method of the flame-retardant PC / ABS composite material of the high-frequency electromagnetic wave shielding of the present embodiment, it comprises the following preparation steps:

[0073] a, the preparation of silver clad copper fiber: the preparation of silver clad copper fiber: disperse the copper fiber of 2L deionized water, 1kg in the reactor, add 5.5Kg mass concentration while stirring and be the silver ammonia solution of 2%, wait for After all the additions are completed, react statically for 3 hours to obtain silver-coated copper fibers, and the particle size of the silver-coated copper fibers is 28 μm;

[0074] b. Surface treatment of silver-clad copper fibers: dissolve 0.5% of γ-aminopropyltriethoxysilane in ethanol, add the silver-clad copper fibers prepared in step a under stirring, and filter off the ethanol after 0.5h , and place it in a 90°C oven for drying;

[0075] c. Extrusion granulation: 48.8% PC, 10% ABS, 10% surface-treated silv...

Embodiment 2

[0077] The preparation method of the flame-retardant PC / ABS composite material of the high-frequency electromagnetic wave shielding of the present embodiment, it comprises the following preparation steps:

[0078] a, the preparation of silver clad copper fiber: the preparation of silver clad copper fiber: disperse the copper fiber of 2L deionized water, 1kg in the reactor, add 5.5Kg mass concentration while stirring and be the silver ammonia solution of 2%, wait for After all the additions were completed, the static reaction was performed for 3.5 hours to obtain silver-coated copper fibers, and the particle size of the silver-coated copper fibers was 29 μm;

[0079] b. Surface treatment of silver-clad copper fibers: dissolve 0.6% γ-aminopropyltriethoxysilane in ethanol, add the silver-clad copper fibers prepared in step a under stirring, and filter off the ethanol after 0.8h. and place it in a 95°C oven for drying;

[0080] c. Extrusion granulation: according to the above for...

Embodiment 3

[0082] The preparation method of the flame-retardant PC / ABS composite material of the high-frequency electromagnetic wave shielding of the present embodiment, it comprises the following preparation steps:

[0083] a, the preparation of silver clad copper fiber: the preparation of silver clad copper fiber: disperse the copper fiber of 2L deionized water, 1kg in the reactor, add 5.5Kg mass concentration while stirring and be the silver ammonia solution of 2%, wait for After all the additions are completed, react statically for 4 hours to obtain silver-coated copper fibers, and the particle size of the silver-coated copper fibers is 30 μm;

[0084] b. Surface treatment of silver-clad copper fibers: dissolve 0.3% γ-aminopropyltriethoxysilane in ethanol, add the silver-clad copper fibers prepared in step a under stirring, filter off ethanol after 1h, and Dry it in an oven at 100°C;

[0085] c. Extrusion granulation: according to the above formula, 50% PC, 14% ABS, 9% surface-treat...

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Abstract

The invention relates to the technical filed of PC (Poly Carbonate) / ABC composite materials and particularly relates to a flame-retardant PC / ABC composite material capable of shielding high-frequency electromagnetic wave and a preparation method thereof. The flame-retardant PC / ABC composite material capable of shielding high-frequency electromagnetic wave comprises PC, ABS, a surface-treated silver-coated copper fiber, a carbon fiber, conductive carbon black, bromotriazine, bisphenol A bis(diphenyl phosphate), polytetrafluoroethylene, an antioxidant 168, an antioxidant 1076, pentaerythritol stearate, an ethylene vinyl acetate copolymer, a silicone-acrylic copolymer toughening agent and gamma-aminopropyl triethoxysilane. Due to the silver-coated copper fiber, the disadvantages that not only the copper fiber is easily oxidized but also silver powder is relatively expensive are avoided, the same effect is achieved and the cost is reduced; the conductivity and the shielding effectiveness are more stable and the flame retardancy is significantly improved. The preparation method disclosed by the invention is simple and mature and high in production efficiency and is conducive to being universally popularized and applied.

Description

technical field [0001] The invention relates to the technical field of PC / ABS composite materials, in particular to a high-frequency electromagnetic wave shielding flame-retardant PC / ABS composite material and a preparation method thereof. Background technique [0002] PC / ABS composite material not only has the characteristics of high hardness, high impact strength and high heat distortion temperature of PC, but also has the advantages of good fluidity and chemical resistance of ABS, and is widely used in automobiles, mobile phones, televisions, Transformers and other fields, however, due to the existence of electromagnetic fields in these fields, pose a serious threat to human health, and these fields have requirements for flame retardancy. Therefore, the development of flame-retardant PC / ABS materials for electromagnetic shielding is particularly important. [0003] The existing electromagnetic shielding technology is mainly modified by conductive carbon black, carbon fibe...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08L55/02C08L23/08C08L27/18C08K13/06C08K9/10C08K9/06C08K7/06C08K3/08C08K3/04C08K5/3492C08K5/523B29B9/06B29C47/92B29C48/92
CPCB29B9/06B29C48/92B29C2948/92704C08K2201/001C08L69/00C08L2201/02C08L2205/035C08L55/02C08L27/18C08L23/08C08L33/04C08K13/06C08K9/10C08K9/06C08K7/06C08K2003/085C08K3/04C08K5/3492C08K5/523
Inventor 胡志刚傅轶彭志宏邓思宇
Owner SILVER AGE ENG PLASTICS DONGGUAN
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