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Core-shell structure type composite flame retardant and preparation method thereof

A technology of composite flame retardant and shell structure, which is applied in the field of functionalized core-shell structure composite flame retardant and its preparation, can solve the problem of surface modification of the coating layer, difficulty in compatibility, and damage to the mechanical properties of the polymer matrix and other issues, to achieve the effect of low price, improved water resistance, stable and long-term water resistance and flame retardancy

Inactive Publication Date: 2013-09-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the core-shell structure APP flame retardant particles prepared based on the in-situ polycondensation reaction (represented by melamine-formaldehyde resin microencapsulated APP) can effectively shield the hygroscopicity of APP, and the cross-linked polymer obtained by the polycondensation reaction is also Endow APP with a chemically inert coating surface, which makes it difficult not only for the coated APP to have good compatibility with the polymer matrix, but also to surface the chemically inert coating layer by conventional methods such as grafting and coupling. Modified to increase the interfacial strength with the polymer matrix (Y.C. Yuan, et al. Polymer, 2008, 49:2531; H.P. Wang, et al. Colloid Polym Sci.2009, 287:1089)
Due to the synergistic flame retardant mechanism of APP gas phase and condensed phase, APP needs to be added in a higher amount (usually 15-30% mass fraction) in the matrix, and at this addition amount, this low-reactivity coated surface core- The introduction of shell-structure APP flame retardant particles is bound to greatly damage the mechanical properties of the polymer matrix, so that the core-shell structure flame retardant particles cannot be used in polymer flame retardant (K. Wu, et al . J Polym Res. 2009, 16:283; Z.Z. W, et al. Polym Eng Sci. 2008, 48:2426)

Method used

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  • Core-shell structure type composite flame retardant and preparation method thereof
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  • Core-shell structure type composite flame retardant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) First mix ammonium polyphosphate and distilled water at a mass ratio of 1:10, then add sodium lauryl sulfate whose mass is 1% of the mass of ammonium polyphosphate, and then ultrasonically stir the mixture at 60°C for 1 hour to fully Emulsification, that is, to obtain a stable ammonium polyphosphate suspoemulsion;

[0040] (2) Weigh potassium persulfate whose mass is 1.25% of the mass of ammonium polyphosphate, dissolve it in distilled water to prepare an aqueous solution with a concentration of 0.5% by mass, and then add it to the stable emulsion obtained in step (1) At the same time, feed nitrogen to protect the reaction system in a nitrogen atmosphere, keep the reaction temperature at 60°C, continue mechanical stirring and carry out condensation and reflux. After potassium persulfate is completely decomposed in the system, add a mass of ammonium polyphosphate dropwise. Quality 15% glycidyl methacrylate, the dropping time is controlled at 45 minutes;

[0041] (3)...

Embodiment 2

[0044] (1) First mix ammonium polyphosphate and distilled water at a mass ratio of 1:8, then add sodium dodecylbenzene sulfate whose mass is 2% of the mass of ammonium polyphosphate, and then ultrasonically stir the mixture at 60°C for 1 hour to Fully emulsified to obtain a stable ammonium polyphosphate suspoemulsion;

[0045] (2) Weigh ammonium persulfate whose mass is 2% of the mass of ammonium polyphosphate, and dissolve it in distilled water to prepare an aqueous solution with a concentration of 1% by mass, and then add it to the stable emulsion obtained in step (1) At the same time, feed nitrogen to protect the reaction system in a nitrogen atmosphere, keep the reaction temperature at 60°C, continue mechanical stirring and carry out condensation and reflux. After potassium persulfate is completely decomposed in the system, add a mass of ammonium polyphosphate dropwise. Quality 25% glycidyl methacrylate, the dropping time is controlled within 1 hour;

[0046] (3) React th...

Embodiment 3

[0049] (1) First mix ammonium polyphosphate and distilled water at a mass ratio of 1:9, then add sodium lauryl sulfate with a mass of 1.5% of the mass of ammonium polyphosphate, and then ultrasonically stir the mixture at 60°C for 1 hour to fully Emulsification, that is, to obtain a stable ammonium polyphosphate suspoemulsion;

[0050] (2) Weigh potassium persulfate whose mass is 1% of the mass of ammonium polyphosphate, and dissolve it in distilled water to prepare an aqueous solution with a concentration of 0.75% by mass, and then add it to the stable emulsion obtained in step (1) At the same time, feed nitrogen to protect the reaction system in a nitrogen atmosphere, keep the reaction temperature at 60°C, continue mechanical stirring and carry out condensation and reflux. After the reaction initiator is completely decomposed in the system, add a mass of ammonium polyphosphate dropwise. Quality 20% glycidyl methacrylate, the dropping time is controlled within 30 minutes;

...

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Abstract

The invention provides a core-shell structure type composite flame retardant and a preparation method thereof. The core-shell structure type composite flame retardant uses ammonium polyphosphate particles as a core and polyglycidyl methacrylate as a coated shell layer. The invention also provides a preparation method of the core-shell structure composite flame retardant. Because a surface layer of the flame retardant provided by the invention is made of waterproof polyglycidyl methacrylate, ammonium polyphosphate can be effectively protected from being dissolved and eroded by water, the water resistance of the ammonium polyphosphate is remarkably improved, a composite material in which the flame retardant is added can be applied to severe working environments such as damp and hot environments; because the polyglycidyl methacrylate has an epoxy group with extremely high reaction activity and can generate a good interface bonding function with an added polymer matrix through chemical reactivity, the mechanical properties of a flame-retardant polymer material can be remarkably improved, and the filling enhancement is realized. The preparation method provided by the invention is simple in process and strong in operability; the larger-scale production is easily realized.

Description

technical field [0001] The invention belongs to the technical field of core-shell structure flame retardants and their preparation, in particular to a functional core- A shell structure composite flame retardant and a preparation method thereof. Background technique [0002] As polymer materials are more and more widely used in building materials, transportation, electronic appliances and other manufacturing fields, the potential fire safety hazards caused by the flammability of polymer materials have become increasingly prominent. High-efficiency flame retardants for molecular materials have become an important direction in the research of polymer materials (A.B. Morgan, et al. John Wily & Sons, Inc. Hoboken, NJ, 2007). Halogen-free flame retardants have gradually replaced halogen-containing flame retardants as an important research and development subject in the field of flame retardants due to their environmental friendliness, low smoke, and non-toxicity (Y.L. Shui, et a...

Claims

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Application Information

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IPC IPC(8): C08F120/32C08F2/26C08L75/04C08K9/04C08K3/32
Inventor 李忠明段宏基雷军钟淦基
Owner SICHUAN UNIV
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