A kind of preparation method of melamine-formaldehyde resin coated magnesium-aluminum layered double metal hydroxide microcapsules

A layered bimetal and melamine technology, applied in the chemical industry, can solve problems such as poor dispersibility and compatibility, and achieve the effects of low cost, excellent heat resistance and simple preparation process

Active Publication Date: 2019-10-11
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using MF resin as the capsule wall and Mg / Al- LDHs as the capsule core, the microcapsules were prepared by in-situ polymerization to solve the problem of poor dispersion and compatibility of Mg / Al- LDHs as a flame retardant in polymer substrates to prepare Mg / Al- LDHs microcapsules with good comprehensive properties

Method used

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  • A kind of preparation method of melamine-formaldehyde resin coated magnesium-aluminum layered double metal hydroxide microcapsules
  • A kind of preparation method of melamine-formaldehyde resin coated magnesium-aluminum layered double metal hydroxide microcapsules
  • A kind of preparation method of melamine-formaldehyde resin coated magnesium-aluminum layered double metal hydroxide microcapsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 80 g of 37% formaldehyde solution, 41.5 g of melamine and 200 g of deionized water were respectively added into the three-necked flask and stirred evenly. Raise the temperature to 70°C, adjust the pH value of the reaction system to 8.5 with 10% triethanolamine solution, stir and react in a 70°C water bath for 60 minutes, take out the solution after it is clear and transparent and reaches the required viscosity, and obtain the MF prepolymer;

[0021] Add 2g of sodium dodecylbenzenesulfonate emulsifier into 100ml of deionized water, heat at 85°C for 1 hour to dissolve, and prepare a 2% emulsifier solution. Take a 500ml three-neck flask, add the emulsifier solution prepared therein, and then add 100ml deionized water and 6g Mg / Al-LDHs. Raise the temperature of the system to 35°C, and stir the mixing system with a multifunctional disperser at a speed of 4000r / min for 60 minutes. After thorough stirring and uniform mixing, the Mg / Al-LDHs emulsion is obtained;

[0022] 3g of...

Embodiment 2

[0024] 80 g of 37% formaldehyde solution, 41.5 g of melamine and 200 g of deionized water were respectively added into the three-necked flask and stirred evenly. Raise to 70°C, use 10% triethanolamine solution to adjust the pH value of the reaction system to 8.5, stir and react in a 70°C water bath for 60 minutes, and take out the solution after it is clear and transparent and reaches the required viscosity to obtain MF prepolymer;

[0025] Add 2g of sodium dodecylbenzenesulfonate emulsifier into 100ml of deionized water, heat at 85°C for 1 hour to dissolve, and prepare a 2% emulsifier solution. Take a 500ml three-neck flask, add the emulsifier solution prepared therein, and then add 100ml deionized water and 6g Mg / Al-LDHs. Raise the temperature of the system to 35°C, and stir the mixing system with a multifunctional disperser at a speed of 4000r / min for 60 minutes. After thorough stirring and uniform mixing, the Mg / Al-LDHs emulsion is obtained;

[0026] 6g of MF prepolymer w...

Embodiment 3

[0028] 80 g of 37% formaldehyde solution, 41.5 g of melamine and 200 g of deionized water were respectively added into the three-necked flask and stirred evenly. Then rise to 70°C, adjust the pH value of the reaction system to 8.5 with 10% triethanolamine solution, stir and react in a 70°C water bath for 60 minutes, take out the solution after it is clear and transparent and reaches the required viscosity, and obtain the MF prepolymer;

[0029] Add 2g of sodium dodecylbenzenesulfonate emulsifier into 100ml of deionized water, heat at 85°C for 1 hour to dissolve, and prepare a 2% emulsifier solution. Take a 500ml three-neck flask, add the emulsifier solution prepared therein, and then add 100ml deionized water and 6gMg / Al-LDHs. Raise the temperature of the system to 35°C, and stir the mixing system with a multifunctional disperser at a speed of 4000r / min for 60 minutes. After thorough stirring and uniform mixing, the Mg / Al-LDHs emulsion is obtained;

[0030] 12g of MF prepolym...

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Abstract

The invention relates to a preparation method of an MF (melamine-formaldehyde) resin-coated Mg / Al-LDHs (magnesium / aluminum-layered double hydroxide) microcapsule. The preparation method comprises the following steps of firstly mixing melamine and formaldehyde according to a molar ratio of 1 to (2 to 4), so as to prepare a clear and transparent MF prepolymer; then, using deionized water as a dispersing medium, and preparing a flame retardant agent Mg / Al-LDHs into a core emulsion under the action of an emulsifying agent; using an in-situ polymerizing method to coat the MF prepolymer around capsule core emulsion droplets, adjusting the pH (potential of hydrogen) value of a solution to weak acid, and enabling the MF prepolymer to further complete condensation reaction at the surface of the Mg / Al-LDHs, so as to generate an insoluble latticed crosslinking structure, and form a capsule wall with certain thickness and strength; finally, using absolute ethyl alcohol to wash for multiple times, drying at the temperature of 60 DEG C, and grinding, so as to obtain the MF-coated Mg / Al-LDHs microcapsule. The preparation method has the advantages that the synergistic flame-retardant function of the nitrogen flame-retardant agent and the Mg / Al-LDHs is fully realized, and the problem of poor dispersivity and compatibility of the flame-retardant agent in a substrate is solved; meanwhile, the preparation technology is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a preparation method of melamine-formaldehyde resin-coated magnesium-aluminum layered double metal hydroxide microcapsules. Background technique [0002] At present, most flame retardant polymers are mainly realized by adding flame retardants. The flame retardants used, such as phosphorus compounds, boron flame retardants, halogen flame retardants, etc., have high moisture absorption and poor weather resistance. Poor loss resistance and other problems will produce a lot of smoke and toxic, harmful and corrosive gases during combustion, causing "secondary disasters". Therefore, it is of great significance to study new flame retardants to reduce the occurrence of fires and the loss of life and property caused by fires. Magnesium-aluminum layered double hydroxides (Mg / Al- LDHs) have some characteristics such as interlayer ion exchange and controllable grain si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/18C08G12/32
Inventor 连海兰顾忠基朱萍
Owner NANJING FORESTRY UNIV
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