Method for preparing cooperative flame retardant nylon 6

A synergistic flame retardant and nylon technology, applied in the field of flame retardant composite material preparation, can solve the problem of no substitutes, and achieve the effect of small impact, small mechanical properties and cost reduction.

Inactive Publication Date: 2010-03-31
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although halogen flame retardants have so many disadvantages, due to the

Method used

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  • Method for preparing cooperative flame retardant nylon 6

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Example Embodiment

[0013] With reference to the drawings, the preparation method of the synergistic flame-retardant nylon 6 of the present invention has the following steps:

[0014] The first step is to add sodium hydroxide aqueous solution to aluminum nitrate and magnesium nitrate aqueous solution for reaction at room temperature, and the reaction time is 1.5-3h; then add the dissolved sodium stearate aqueous solution to the aforementioned reaction system and continue the reaction The reaction time is 1.5-3h; the product is filtered, washed, and dried to obtain modified layered magnesium aluminum hydroxide powder. Among them, the molar ratio of sodium stearate, aluminum nitrate and magnesium nitrate is 0.8-1.2:1:3.

[0015] In the second step, weigh the microcapsule red phosphorus, modified layered magnesium aluminum double hydroxide powder and nylon 6 pellets, and dry them; among them, the microcapsule red phosphorus, layered magnesium aluminum double hydroxide powder and nylon 6 pellets In the m...

Example Embodiment

[0017] Example 1

[0018] The preparation method of the synergistic flame-retardant nylon 6 of the present invention has the following steps:

[0019] The first step: Mix 60g melamine and 119.05g formaldehyde solution (36%), react at pH=9 and 80℃ for 25min to prepare prepolymer; add 5.5g ammonium persulfate and prepolymer to 300g red In a 1.2L aqueous solution of phosphorus (about 5000 mesh), the pH value is adjusted to 5, the temperature is controlled at 55°C, and the reaction is 1.5h; the product is filtered, washed, and dried to obtain microencapsulated red phosphorus;

[0020] Step 2: At room temperature, add 3L of 1.5M sodium hydroxide aqueous solution to 3L of 2M aluminum nitrate and 6M magnesium nitrate aqueous solution, and react for 1.5h; then, add 1L of dissolved 4.8M hardened to the aforementioned reaction system. Sodium fatty acid aqueous solution, react for 1.5h; the product is filtered, washed and dried to obtain modified layered magnesium aluminum hydroxide powder;

[...

Example Embodiment

[0024] Example 2

[0025] The preparation method of the synergistic flame-retardant nylon 6 of the present invention has the following steps:

[0026] The first step: Mix 60g of melamine and 119.05g of formaldehyde solution (36%), react at pH=9, 95°C for 45min to prepare a prepolymer; add 5.5g of potassium persulfate and the prepolymer to 360g of red In a 1.2L aqueous solution of phosphorus (about 5000 mesh), the pH value is adjusted to 6, the temperature is controlled at 75°C, and the reaction is 1.5h; the product is filtered, washed, and dried to obtain microencapsulated red phosphorus;

[0027] Step 2: At room temperature, add 3L of 1.5M sodium hydroxide aqueous solution to 3L of 2M aluminum nitrate and 6M magnesium nitrate aqueous solution, and react for 1.5h; then, add 1L of dissolved 7.2M hardened to the aforementioned reaction system. Sodium fatty acid aqueous solution, react for 1.5h; the product is filtered, washed and dried to obtain modified layered magnesium aluminum hyd...

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Abstract

The invention discloses a method for preparing cooperative flame retardant nylon 6, which comprises the following steps: adding a sodium hydroxide aqueous solution in an aluminum nitrate and magnesiumnitrate aqueous solution to react at room temperature; then adding a dissolved sodium stearate aqueous solution in the reaction system and then keeping the reaction; filtering, washing and drying theproduct to obtain modified lamellar magnesium aluminum bihydroxide powder; respectively weighing microcapsule red phosphorus, the modified lamellar magnesium aluminum bihydroxide powder and nylon 6 granules and drying; premixing the three dried materials; fusing, blending, extruding and granulating in a double-screw rod extruder; drying to obtain a cooperative flame retardant nylon 6 master granule. The invention uses ammonium persulphate as an initiating agent, and an ignition point of the prepared microcapsule red phosphorus exceeds 450DEG C; when the vertical combustion performance of a nylon 6 composite material reaches the V-0 level, and LOI reaches more than 28 percent, the consumption of flame retardant agents is less, and all used flame retardant agents are cheap halogen-free flame retardant agents, thereby reducing the cost.

Description

technical field [0001] The invention belongs to the preparation of flame-retardant composite materials, in particular to a preparation method of synergistic flame-retardant nylon 6. Background technique [0002] Nylon 6 is one of the most widely used engineering plastics at present. It has excellent mechanical strength, wear resistance, self-lubricating property, corrosion resistance and molding processability. However, the limiting oxygen index of nylon PA6 is only about 22%. At the same time, when it is heated and burned, it is particularly prone to melt dripping, which ignites other combustibles, causing the fire to spread further, causing casualties and property losses. Therefore, it is necessary to Make the necessary flame retardant modification to it. [0003] Since 1971, when Miyata et al first published related reports about layered double hydroxides (LDHs) in public journals, the application reports about it have been increasing year by year. If an organic anion i...

Claims

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Application Information

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IPC IPC(8): C08L77/02C08K9/04C08K9/10
Inventor 汪信蒋文俊杨绪杰张春祥刘孝恒陆路德吴汾周勇王岩韩巧凤朱俊武郝青丽沈爱辉
Owner NANJING UNIV OF SCI & TECH
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