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A technology of magnesium hydroxide and expanded graphite, applied in the field of LED heat dissipation, can solve problems such as insufficient thermal conductivity and mechanical properties
Inactive Publication Date: 2017-11-14
安徽中威光电材料有限公司
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However, there are insufficient thermal conductivity and mechanical properties
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[0019] A preparation method of magnesium hydroxide-expandable graphite composite flame-retardant nylon 6, characterized in that, the following steps are carried out:
[0020] a. Sodium stearate modified magnesium hydroxide flame retardant:
[0021] Dry 15kg of magnesium hydroxide in an electric blast drying oven at 80-90°C for 6 hours, then put it into a high-speed mixer, and spray the sodium stearate solution evenly on the surface of magnesium hydroxide with a spray bottle. Stir and modify at ℃ for 35 minutes to obtain a modified sample;
[0023] Add ethanol aqueous solution 1:3 to 10kg expandable graphite, stir well, add 0.5kg silane coupling agent KH550 dropwise, stir for 1h for hydrolysis, add 1kg of boric acid, stir for 1h, filter, and dry completely at 70-80°C to obtain modified expandable graphite;
[0024] c. Add acetone to 5kg carbon fiber at a ratio of 1:5, soak for 4 hours, ...
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Abstract
The invention discloses magnesium hydroxide-expandable graphite compounded flame-retardant nylon 6 and a preparation method thereof. The preparation method is characterized by comprising the following steps: drying magnesium hydroxide, putting dried magnesium hydroxide into a high-speed mixing machine, uniformly spraying a sodium stearate solution to the surface of magnesium hydroxide by virtue of a spraying bottle, and stirring for modification, so as to obtain a modified sample; adding an ethanol water solution into the expandable graphite, adequately stirring, dropwise adding a silane coupling agent KH550, stirring for hydrolysis, adding boric acid, stirring to react, filtering, and drying, so as to obtain modified expandable graphite; adding acetone into carbon fibers, soaking for treatment, soaking the carbon fibers into concentrated nitric acid, washing, carrying out ultrasonic cleaning, and drying, so as to obtain surface-oxidized carbon fibers; and drying nylon 6 for 4-6 hours, mixing the nylon 6 with liquid paraffin, a graphene micropiece and the obtained material, carrying out melt blending and extrusion by virtue of a double-screw extruder, carrying out traction and drawing, and carrying out granulation by virtue of a granulator, so as to obtain particles.
Description
technical field [0001] The invention relates to the field of LED heat dissipation, in particular to a magnesium hydroxide-expandable graphite composite flame-retardant nylon 6 and a preparation method thereof. Background technique [0002] With the wide application of LED in life and production, it is found that LED chips generate a lot of heat during use, and the accumulation of heat will shorten their life. Therefore, how to improve the thermal conductivity of LED packaging materials is an urgent problem to be solved. [0003] Li Qiaomei prepared a high proportion of heat-conducting particle ceramics with epoxy resin as the matrix and silicon dioxide and silicon carbide as the heat-conducting particles in her master's thesis "The Effect of Thermally Conductive Particle Sintering and Composite Material Orientation on the Heat Dissipation of High-power LEDs" Chips and oriented high thermal conductivity polymer-based composite materials, in which high-proportion thermal condu...
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