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Preparation method of melamine/formaldehyde resin-coating melamine cyanurate (MCA) nano capsule

A technology of melamine cyanurate and melamine, which is applied in the field of materials, can solve the problems of poor compatibility of polymer matrix and easy aggregation of nanoparticles, and achieve the effect of enhancing compatibility and good flame retardant efficiency

Inactive Publication Date: 2013-08-21
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For nano-MCA, on the one hand, the nanoparticles are very easy to agglomerate, on the other hand, MCA is added to the polymer material, which has the disadvantage of poor compatibility with the polymer matrix.

Method used

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  • Preparation method of melamine/formaldehyde resin-coating melamine cyanurate (MCA) nano capsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Preparation of melamine / formaldehyde resin prepolymer:

[0020] Add 12.6g of melamine and 24.33g of 37% formaldehyde (molar ratio is 1:3) and 100ml of distilled water into the three-necked flask. Add a certain amount of sodium hydroxide to adjust the pH of the solution to 8-10, react at 80°C for 0.5h, and cool to room temperature to obtain a colorless and transparent melamine / formaldehyde resin prepolymer solution.

[0021] (2) Preparation of melamine / formaldehyde resin-coated melamine cyanurate (MCA) nanocapsules:

[0022] Add 100g nanometer melamine cyanurate (MCA) and 1g sodium dodecyl sulfate into 200ml distilled water mechanically and ultrasonically disperse for 1 h. Then add the melamine / formaldehyde resin prepolymer prepared in step (1) into the fully dispersed nano-MCA mixed system, use concentrated sulfuric acid to adjust the pH of the solution to around 4-5, react at 80° C. for 2 hours, filter and wash. Vacuum-dried at 80°C for 48 h to obtain dried MCA n...

Embodiment 2

[0024] (1) Preparation of melamine / formaldehyde resin prepolymer:

[0025] Add 12.6g of melamine and 20.27g of 37% formaldehyde (molar ratio 1:2.5) and 100ml of distilled water into the three-necked flask. Add a certain amount of sodium hydroxide to adjust the pH of the solution to 8-10, react at 80°C for 0.5h, and cool to room temperature to obtain a colorless and transparent melamine / formaldehyde resin prepolymer solution.

[0026] (2) Preparation of melamine cyanurate (MCA) nanocapsules coated with melamine / formaldehyde resin:

[0027] Add 100g nanometer melamine cyanurate (MCA) and 3g hexadecyltrimethylammonium bromide into 200ml ethanol mechanically and ultrasonically disperse for 1 h. Then add the melamine / formaldehyde resin prepolymer prepared in step (1) into the fully dispersed nano-MCA mixed system, use concentrated sulfuric acid to adjust the pH of the solution to around 3-4, react at 80° C. for 3 hours, filter and wash. Vacuum-dry at 80°C for 48 h to obtain dried...

Embodiment 3

[0029] (1) Preparation of melamine / formaldehyde resin prepolymer:

[0030] Add 12.6g of melamine and 32.44g of 37% formaldehyde (molar ratio of 1:4) and 100ml of distilled water into the three-necked flask. Add a certain amount of sodium hydroxide to adjust the pH of the solution to 8-10, react at 80°C for 0.5h, and cool to room temperature to obtain a colorless and transparent melamine / formaldehyde resin prepolymer solution.

[0031] (2) Preparation of melamine cyanurate (MCA) nanocapsules coated with melamine / formaldehyde resin:

[0032] Add 100g of nanometer melamine cyanurate (MCA) and 2g of nonylphenol polyoxyethylene ether into 200ml of ethanol and distilled water mixed solvent (volume ratio 1:1) and mechanically and ultrasonically disperse for 1 h. Then add the melamine / formaldehyde resin prepolymer prepared in step (1) into the fully dispersed nano-MCA mixed system, use concentrated sulfuric acid to adjust the pH of the solution to around 3-4, react at 80°C for 2.5h, ...

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Abstract

The invention belongs to the technical field of materials, and particularly relates to a method for preparing a nano capsule by utilizing melamine / formaldehyde resin to coat the surface of melamine cyanurate (MCA). The method comprises the following steps of placing the melamine and the formaldehyde into a three-necked bottle to be reacted to prepare a melamine / formaldehyde resin prepolymer sedimentation solution; meanwhile, dispersing the nano MCA into a solvent in another three-necked bottle; and adding the prepolymer into the well-dispersed nano MCA system to prepare the melamine / formaldehyde resin-coating MCA nano capsule through the steps of reaction, filtering, washing and drying. The grain size of the melamine / formaldehyde resin-coating MCA nano capsule prepared by the method is 100nm to 300nm.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a preparation method of melamine / formaldehyde resin-coated melamine cyanurate (MCA) nanocapsules. Background technique [0002] Melamine cyanurate (MCA) is currently the most widely used nitrogen-based flame retardant. Nitrogen flame retardants form ammonia and other non-combustible gases during the decomposition process, which dilutes and dilutes flammable gases, thus playing a better flame-retardant effect. The main advantages of nitrogen-based flame retardants are halogen-free, low-smoke, and beneficial to environmental protection. MCA has excellent flame retardant properties in polyamides, has a small amount of smoke when burning, and can also play a lubricating role in processing [Advanced Materials Research, 2011, 399-401: 444~448]. [0003] For nano-MCA, on the one hand, nanoparticles are easy to agglomerate; on the other hand, when MCA is added to polymer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L101/00C08K9/10C08K5/3492C08G12/32
Inventor 王正洲徐少洪
Owner TONGJI UNIV
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