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Two-step method for recycling melamine by degrading waste melamine resin

A melamine resin and melamine technology, applied in the direction of organic chemistry, etc., can solve the problems of not being able to recover all components of waste melamine resin and high energy consumption, and achieve strong technical operability, no secondary pollution, and mild reaction conditions. Effect

Inactive Publication Date: 2020-10-16
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems that the existing mechanical treatment method consumes high energy and the high-temperature pyrolysis method cannot realize the recovery of all components of waste melamine resin, the present invention provides a two-step method for degrading waste melamine resin and recycling melamine

Method used

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  • Two-step method for recycling melamine by degrading waste melamine resin
  • Two-step method for recycling melamine by degrading waste melamine resin
  • Two-step method for recycling melamine by degrading waste melamine resin

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Step 1, crush 1g of waste melamine resin into pellets with a particle size of 0.05mm, add tetrahydrofuran (the mass ratio of tetrahydrofuran to waste melamine resin is 1:1) to swell the waste melamine resin, and swell at 20°C 6h, making the melamine resin swelling and fluffy.

[0031] Step 2, immerse the swollen waste melamine resin into the HCl-water and ethanol system, and degrade it in a pressure vessel at 100°C for 12h under its own pressure (the mass ratio of HCl to the swollen waste melamine resin is 1:1; solvent and The mass ratio of the waste and old melamine resin after swelling is 1:1, and the volume ratio of water and ethanol in the solvent is 1:1), so that the melamine resin is degraded, the filter cake is washed with distilled water after filtration, reclaims and obtains melamine 0.8g, and collects the filtrate Can be recycled. The infrared spectrum of melamine is detailed in figure 1 , the wave number at 1840 corresponds to the C=N double bond on the mel...

Embodiment 2

[0033] Step 1, 1g waste and old melamine resin is pulverized into the particle diameter and is the pellet of 0.1mm, adds dichloromethane (the mass ratio of dichloromethane and waste and old melamine resin is 10:1) waste and old melamine resin is swelled, in Swell at 30°C for 6 hours, making the melamine resin swell and fluffy.

[0034] Step 2, immerse the swollen waste melamine resin in HNO 3 -Water, DMSO system, degrade for 10h under the self-pressure of the pressure vessel at 120°C (HNO 3 The mass ratio of the waste and old melamine resin after swelling is 1:2; the mass ratio of the solvent and the swelling of the waste and old melamine resin is 100:1, and the volume ratio of water and DMSO in the solvent is 1:1.5), so that the melamine The resin was degraded, and after filtration, the filter cake was washed with distilled water to recover 0.82 g of melamine.

Embodiment 3

[0036] Step 1, crush 1g of waste melamine resin into pellets with a particle size of 0.2mm, add chloroform (the mass ratio of chloroform to waste melamine resin is 20:1) to swell the waste melamine resin, and swell at 50°C 5h, making the melamine resin swelling and fluffy.

[0037] Step 2, immerse the waste melamine resin after swelling in H 2 SO 4 -Water, dichloromethane system, degrade for 9h (H 2 SO 4 The mass ratio with the waste and old melamine resin after swelling is 1:3; The mass ratio of solvent and the waste and old melamine resin after swelling is 30:1, and the volume ratio of water and dichloromethane in the solvent is 1:2), making The melamine resin was degraded, and after filtration, the filter cake was washed with distilled water to recover 0.78 g of melamine.

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Abstract

The invention belongs to the field of cyclic utilization and recycling of waste resin, and particularly relates to a two-step method for recycling melamine by degrading waste melamine resin. The method comprises the following steps: (1) crushing waste melamine resin into granules, and adding an aprotic organic swelling agent to fully swell the granules; and (2) immersing the swelled waste melamineresin into a catalyst-solvent system, degrading the waste melamine resin at a temperature of 100-200 DEG C, filtering, washing a filter cake with distilled water, and recycling to obtain melamine.

Description

technical field [0001] The invention belongs to the field of resin solid waste recycling and resource utilization, and in particular relates to a two-step method for degrading waste melamine resin and recycling melamine. Background technique [0002] Melamine resin, also known as melamine-formaldehyde resin, melamine-formaldehyde resin (melamine-formaldehyde resin English abbreviation MF), is a polymer obtained by the reaction of melamine and formaldehyde. The main post-processing product of melamine is melamine resin (a kind of amino resin). Starting from this product, according to different purposes and using different process conditions, a series of products with different purposes are derived. They are mainly used as coating crosslinking agents, Fabric finishing agent, wet strength agent for papermaking, glazing agent, water-resistant agent, leather tanning agent, flame retardant, high-efficiency cement water-reducing agent, adhesive and impregnating agent for comprehens...

Claims

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Application Information

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IPC IPC(8): C07D251/54C07D251/62
CPCC07D251/54C07D251/62
Inventor 侯相林武少弟邓天昇
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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