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A method for reusing melamine-formaldehyde resin foam waste and flame retardant prepared therefrom

A formaldehyde resin, melamine technology, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc. Utilization and other problems, to achieve the effect of cheap raw materials, easy availability of raw materials, and good flame retardant performance

Active Publication Date: 2022-03-18
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, melamine-formaldehyde resin foam is a thermosetting polymer. Like other thermosetting polymer materials, it is difficult to dissolve, melt, and decompose after forming a foam material. Therefore, it is difficult to recycle waste melamine-formaldehyde resin foam.
The commonly used methods of incineration and landfill will inevitably pollute the environment

Method used

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  • A method for reusing melamine-formaldehyde resin foam waste and flame retardant prepared therefrom
  • A method for reusing melamine-formaldehyde resin foam waste and flame retardant prepared therefrom
  • A method for reusing melamine-formaldehyde resin foam waste and flame retardant prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for reusing melamine-formaldehyde resin foam waste, comprising the following steps:

[0026] S1, measure the divalent tin ion wastewater solution whose concentration is 2706 mg / L, and adjust the pH value of the solution to 7 with ammonia;

[0027] S2. Put 0.5 g of melamine-formaldehyde resin foam waste into 200 mL of the solution obtained from S1, and keep it at room temperature for 30 min;

[0028] S3. Take out the melamine-formaldehyde resin foam waste in S2, and keep it at 320°C for 60 min;

[0029] S4, grinding the product of S3 into micron-sized particles as a product, marked as MF-SnO 2 .

[0030] Product Morphology and Structural Characterization

[0031] figure 1 and figure 2 It is a scanning electron microscope picture (different magnifications) of the product obtained in Example 1. from figure 1 (200 times) It can be seen that the three-dimensional network structure of the melamine-formaldehyde resin foam is destroyed after grinding, forming a...

Embodiment 2

[0045] A method for reusing melamine-formaldehyde resin foam waste, comprising the following steps:

[0046] S1. Take a divalent tin ion aqueous solution with a concentration of 2000 mg / L, and adjust the pH value of the solution to 8 with sodium hydroxide;

[0047] S2. Put 0.2 g of melamine-formaldehyde resin foam waste into 100 mL of the solution obtained in S1, and keep it at room temperature for 200 min;

[0048] S3. Take out the melamine-formaldehyde resin foam waste in S2, and keep it at 300°C for 30 minutes;

[0049]S4. Grinding the product of S3 into micron-sized particles and using it as a flame retardant.

Embodiment 3

[0051] A method for reusing melamine-formaldehyde resin foam waste, comprising the following steps:

[0052] S1. Measure the divalent tin ion aqueous solution whose concentration is 3000 mg / L, and adjust the pH value of the solution to 7.5 with potassium hydroxide;

[0053] S2. Put 1 g of melamine-formaldehyde resin foam waste into 500 mL of the solution obtained in S1, and keep it at room temperature for 5 min;

[0054] S3. Take out the melamine-formaldehyde resin foam waste in S2, and keep it at 280°C for 180 min;

[0055] S4. Grinding the product of S3 into micron-sized particles and using it as a flame retardant.

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Abstract

The invention belongs to the field of resource regeneration and discloses a method for reusing melamine-formaldehyde resin foam waste and a flame retardant prepared therefrom. S1. Use alkali to adjust the pH value of the divalent tin ion wastewater solution to 7~8; S2. Put the melamine formaldehyde resin foam waste into the solution obtained from S1 and keep it for 5~200 min; S3. Put the melamine formaldehyde resin in S2 The foam waste is taken out, and kept at 280-320°C for 30-180 min; S4, the product of S3 is ground into granules, and used as a flame retardant for later use. In the present invention, melamine-formaldehyde resin foam waste is used to treat tin-containing wastewater, the removal rate is greater than 99.99%, and the final tin concentration in the wastewater is less than the emission requirements in GB30770-2014 "Discharge Standards for Industrial Pollutants of Tin, Antimony, and Mercury"; meanwhile, The foam after adsorbing tin has good flame retardant properties after simple heat treatment and grinding, and is a new type of composite flame retardant.

Description

technical field [0001] The invention belongs to the field of resource regeneration, and in particular relates to a method for reusing melamine-formaldehyde resin foam waste and a flame retardant prepared therefrom. Background technique [0002] Melamine formaldehyde resin foam is widely used in people's production and life because of its good flame retardancy, sound absorption and heat preservation properties. But melamine formaldehyde resin foam is a kind of thermosetting polymer, like other thermosetting polymer materials, it is difficult to dissolve, melt and decompose after forming foam material, therefore, waste melamine formaldehyde resin foam is difficult to recycle and reuse. Commonly used methods of incineration and landfill will inevitably pollute the environment. Therefore, how to recycle melamine formaldehyde resin foam is of great significance. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, the object of the presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/40C08L61/28C08K3/22C08L27/06C02F1/28C02F101/20
CPCC08J9/40C08L27/06C02F1/285C08J2361/28C02F2101/20C08L2201/02C08K2003/2231C08L61/28C08K3/22
Inventor 李志伟邱晓庆赵晓伟李小红张治军
Owner HENAN UNIVERSITY