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Nano-modified magnesium-aluminum composite flame retardant and its preparation method and application

A technology of nano-modification and aluminum compounding, which is applied in the field of flame retardants, can solve the problems of difficulty in controlling the degree of reaction and molecular weight distribution, adverse effects of subsequent application of preparation, and great damage to the human body, and achieve excellent compatibility, low raw material cost, Effects of improving heat resistance and electrical performance

Active Publication Date: 2017-10-31
浙江嘉民新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This system uses phosphoric acid as a catalyst. Phosphoric acid has strong acidity, fast reaction rate, and it is difficult to control the degree of reaction and molecular weight distribution. In addition, most of the nitrogen-containing acid-binding agents are ammonia water, ethylenediamine, triethylamine, etc., which are highly volatile and highly stimulating. Amines are more harmful to the human body, and there will be residues in the resin, which will adversely affect the preparation and subsequent application of the product

Method used

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  • Nano-modified magnesium-aluminum composite flame retardant and its preparation method and application
  • Nano-modified magnesium-aluminum composite flame retardant and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Slowly add 0.2mol / L magnesium nitrate and 0.1mol / L aluminum nitrate mixed solution (100ml) dropwise into 500mL sodium dodecylbenzenesulfonate solution with a concentration of 0.1mol / L at room temperature, and keep the pH of the system at 9-11, aging at 60°C for 20 hours after the dropwise addition, filtering and washing, the obtained white powder is the nano-modified flame retardant. The reaction yield was 92%.

[0031] figure 1 The X-ray diffraction pattern of the nano-modified magnesium-aluminum composite flame retardant prepared for this example, it can be seen from the figure that the first-order diffraction peak (003) appears at 3.10°, and the corresponding layer spacing is 2.84nm, which is indeed Modifiers at the nanoscale.

[0032] figure 2 Schematic diagram of the structure of the nano-modified magnesium-aluminum composite flame retardant prepared for this example, the intercalation agent is mainly sodium dodecylbenzenesulfonate between the sheets, and there...

Embodiment 2

[0035] Slowly add 0.1mol / L magnesium nitrate and 0.05mol / L aluminum nitrate mixed solution (50ml) dropwise into 500mL sodium dodecylbenzenesulfonate solution with a concentration of 0.05mol / L at room temperature to keep the pH of the system at 9-11, aging at 80°C for 15 hours after the dropwise addition, filtering and washing, the obtained white powder is the nano-modified flame retardant. The reaction yield was 95%.

[0036] Melt blend 20 grams of the nano-modified flame retardant prepared in this example with 180 grams of thermoplastic phenolic resin on a three-roll machine (drum temperature 90-120°C), and mix thoroughly for 30 minutes to obtain a nano-modified flame retardant Thermoplastic phenolic resin B.

Embodiment 3

[0038] Slowly add 0.2mol / L magnesium nitrate and 0.1mol / L aluminum nitrate mixed solution (200ml) dropwise into 1000mL sodium dodecylbenzenesulfonate solution with a concentration of 0.1mol / L at room temperature to keep the pH of the system at 10-11, aging at 60°C for 18 hours after the dropwise addition, filtering and washing, the obtained white powder is the nano-modified flame retardant. The reaction yield was 95%.

[0039] Melt blend 20 grams of the nano-modified flame retardant prepared in this example with 180 grams of thermoplastic phenolic resin on a three-roll machine (drum temperature 90-120°C), and mix thoroughly for 30 minutes to obtain a nano-modified flame retardant Thermoplastic phenolic resin C.

[0040] The modified flame-retardant thermoplastic phenolic resin prepared according to Examples 1-3, respectively, and the common thermoplastic phenolic resin (comparative example) were prepared using the formula in Table 1 to prepare a phenolic molding compound, and...

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Abstract

The invention discloses a preparation method of a nano-modified flame retardant, which comprises mixing soluble magnesium salt, soluble aluminum salt and water to obtain a mixed solution, then adding the mixed solution dropwise into an aqueous solution of sodium dodecylbenzenesulfonate, and Keep the pH value of the reaction system at 8-13, and obtain the nano-modified flame retardant by aging and filtering after the addition; the total concentration of metal ions in the mixed solution is 0.05-2mol / L, magnesium aluminum The molar ratio is 2:1. The invention discloses a nano-modified magnesium-aluminum composite flame retardant, which has a layered structure with a nano-scale interlamellar distance, excellent compatibility with phenolic resin, good dispersion, and excellent flame retardancy Effect, only a very small amount can make phenolic resin products have obvious flame retardant effect; at the same time, its mechanical properties, heat resistance and electrical properties have been improved, suitable for phenolic molding compounds, fiber reinforced composite materials, brake pads and Preparation of resin grinding wheel and casting field.

Description

technical field [0001] The invention relates to the technical field of flame retardants, in particular to a nano-modified magnesium-aluminum composite flame retardant and its preparation method and application. Background technique [0002] Thermoplastic phenolic resin has a history of hundreds of years and is widely used due to its advantages of low cost, easy preparation, and stable size. However, thermoplastic phenolic resins have many disadvantages in addition to the above advantages, such as poor toughness, easy to absorb water and moisture, limited heat resistance and flame retardancy, etc. [0003] The traditional method of flame retardant modification of phenolic resin is generally modified by halogen-containing flame retardants. The flame retardant effect of this series of flame retardants is obvious, and its production and use will cause serious pollution to the environment and certain harm to human health. At present, It has been banned in most European and Ameri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/04C08K3/28C08K3/16C08L61/06
Inventor 沈芳沈培林
Owner 浙江嘉民新材料有限公司
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