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

A nano-modification, aluminum composite technology, applied in the field of flame retardants, can solve the problems of difficult control of reaction degree and molecular weight distribution, adverse effects of preparation and subsequent application, large human body damage, etc., to achieve excellent compatibility, low cost of raw materials, Effect of improving heat resistance and electrical properties

Active Publication Date: 2015-07-01
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 preparation method and application thereof
  • Nano-modified magnesium-aluminum composite flame retardant and preparation method and application thereof

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. The preparation method comprises the following steps: mixing a soluble magnesium salt, a soluble aluminum salt and water to obtain a mixed solution; then dropwise adding the mixed solution into a sodium dodecyl benzene sulfonate aqueous solution and maintaining the pH value of the reaction system at 8-13; and then aging and filtering to obtain the nano-modified flame retardant, wherein the total concentration of metal ions in the mixed solution is 0.05-2mol/L, and the magnesium-aluminum molar ratio is 2: 1. The invention discloses the nano-modified magnesium-aluminum composite flame retardant which has a laminar structure with nanoscale interlamellar spacing, has excellent compatibility with phenolic resin, good dispersibility and extremely excellent flame retardant effect; by use a very small amount of the flame retardant, a phenolic resin product has an obvious flame retardant effect and moreover the mechanical property, the heat resistance and the electric property are improved, and therefore the phenolic resin product is suitable for the field of preparation and casting of phenolic moulding plastic, fiber reinforced composite materials, brake pads and resin wheels.

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 Applications(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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