Preparation method of expandable carbon nitride flame retardant epoxy resin
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A technology of epoxy resin and carbon nitride, which is applied in the flame retardant field of flame retardant epoxy resin system, can solve the problem of destroying the layered structure, and achieve the effects of improving flame retardant performance, delaying decomposition, and increasing the value of oxygen index
Active Publication Date: 2017-11-21
YANGZHOU UNIV
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However, while g - C 3 N 4 It has a graphite-like layered structure, but each layer is formed by hydrogen bonding of long-chain macromolecules of melamine, g - C 3 N 4 There are different degrees of defects in each layer of , which leads to the destruction of its layered structure by the intercalation method of sulfuric acid, potassium permanganate and sodium nitrate oxidation
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[0027] 1. Preparation of expanded carbon nitride:
[0028] 1. Add 30-50mL of concentrated sulfuric acid (preferably 10mL) to the flask, and add 10-12g (preferably 3g) of graphite-structured carbon nitride (g - C 3 N 4 ). Put it in a constant temperature water bath with a magnetic stirrer, turn on the magnetic stirrer, raise the temperature of the water bath to 60-80°C, stir until the carbon nitride dissolves, and obtain a carbon nitride-concentrated sulfuric acid solution.
[0029] 2. Put the carbon nitride-concentrated sulfuric acid solution into a low-temperature cold bath, and cool it to 8-10°C at a rate of 2-4°C / h. As the temperature decreases slowly, the solution begins to precipitate white expandable carbon nitride crystals. Finally, white expandable carbon nitride crystals were obtained.
[0030] 3. Transfer the white expandable carbon nitride crystals to a sand core funnel, filter under reduced pressure, take the solid phase and wash the precipitate with absolute et...
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Abstract
The invention discloses a preparation method of expandable carbon nitride flame retardant epoxy resin, which relates to the flame retardant technical field of flame retardant epoxy resin system. The expandable carbon nitride is used as the flame retardant, the epoxy resin is used as the matrix, and the curing agent is used for curing. Synergistic preparation of flame retardant epoxy resin composites. The limiting oxygen index and scanning electron microscope analysis methods are used for testing and characterization. Compared with expandable graphite, expandable carbon nitride has better compatibility. After thermal expansion, a denser carbon layer is formed, which can be well developed To heat insulation and oxygen insulation, delay or inhibit the combustion of the system. The invention successfully prepares a new generation of high-performance flame-retardant material that is halogen-free, highly efficient, non-toxic and low-smoke.
Description
technical field [0001] The invention relates to the field of fire-retardant technology of flame-retardant epoxy resin systems, in particular to the preparation technology of expandable carbon nitride flame-retardant epoxy resin. Background technique [0002] In recent years, rubber, plastics, synthetic fibers, coatings, adhesives, five major synthetic materials, polymer materials and their products have developed vigorously, and they are rapidly replacing traditional natural polymers such as steel, metal, cement, wood, and cotton. Used in various sectors of the national economy such as industry, agriculture, and military, but most polymers are flammable materials, and the resulting fires and property losses are increasing. According to reports, fire accidents have been frequent in the past two years. In 2014, there were 395,000 fires nationwide, with 1,817 deaths and 1,493 injuries, and a direct property loss of 4.39 billion yuan. In 2015, a total of 338,000 fires were repor...
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