A Method for Recycling Waste Thermosetting Resin Using Microwave

A thermosetting and microwave heating technology, applied in separation methods, plastic recycling, recycling technology, etc., can solve problems such as difficult to popularize and apply, harsh recycling conditions, and use of large ionic liquids

Active Publication Date: 2021-05-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has a high degradation efficiency, it uses a large amount of expensive ionic liquids, which is costly and difficult to popularize in practice.
[0006] A comprehensive comparison of the recycling methods of the above-mentioned several thermosetting resins shows that most of the existing recycling technologies have disadvantages such as harsh recycling conditions, high requirements for equipment, high cost, low added value of recycled products, long recycling process, and secondary pollution. risks, practical promotion is difficult

Method used

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  • A Method for Recycling Waste Thermosetting Resin Using Microwave
  • A Method for Recycling Waste Thermosetting Resin Using Microwave
  • A Method for Recycling Waste Thermosetting Resin Using Microwave

Examples

Experimental program
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Effect test

Embodiment 1

[0051] (1) Immerse 100 parts of waste unsaturated polyester resin in 100 parts of cyclohexanone, then place it in a frequency conversion microwave reactor, add a reflux device, and heat the resin for 120 minutes by microwave to fully swell the resin. Set the temperature of microwave heating to 120 ℃, during the microwave heating process, the microwave power is automatically adjusted within the range of no more than 500W with the reaction temperature, and the swollen resin is separated by filtration and washed with acetone under ultrasonic conditions to remove cyclohexanone, and the filtered cyclohexanone is directly recycled .

[0052] (2) The swollen and washed resin was microwave-heated for 7 minutes under the condition of microwave power of 500 W, that is, the recovery of waste unsaturated polyester resin was completed, and an oil-water separation material was obtained.

Embodiment 2

[0054](1) Immerse 100 parts of waste epoxy resin in 50 parts of N-methylpyrrolidone, then place it in a frequency conversion microwave reactor, add a reflux device, and heat it with microwave for 420 minutes to fully swell the resin. Set the microwave heating temperature to 60°C , during the microwave heating process, the microwave power is automatically adjusted within the range of no more than 800W with the reaction temperature, the swollen resin is separated by filtration and washed with ethyl acetate under ultrasonic conditions to remove N-methylpyrrolidone, and the filtered N-methylpyrrolidone The base pyrrolidone can be recycled directly.

[0055] (2) Microwave the swollen and washed resin for 15 minutes under the condition of microwave power of 200 W, that is, the recovery of waste epoxy resin is completed, and an oil-water separation material is obtained.

Embodiment 3

[0057] (1) Immerse 100 parts of waste furan resin in 200 parts of o-chlorotoluene, then place it in a frequency conversion microwave reactor, add a reflux device, set the microwave heating temperature to 100°C, and heat the resin for 300 minutes to fully swell the resin. During the process, the microwave power is automatically adjusted within the range of no more than 400W with the reaction temperature, and the swollen resin is filtered and separated, washed with ethanol under ultrasonic conditions to remove o-chlorotoluene, and the filtered o-chlorotoluene is directly recycled.

[0058] (2) The swollen and washed resin was microwave-heated for 2 minutes under the condition of microwave power of 400 W, that is, the recovery of waste furan resin was completed, and an oil-water separation material was obtained.

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Abstract

The invention provides a method for recovering waste thermosetting resins using microwaves, the steps are as follows: (1) immerse waste thermosetting resins in a polar solvent with a boiling point of at least 100°C, heat the thermosetting resins with microwave heating, and control the temperature of microwave heating not to exceed The thermal decomposition temperature of the thermosetting resin is used to wash the swollen thermosetting resin; (2) Method 1: Microwave treatment is performed on the swelled and washed thermosetting resin to improve the internal pore structure of the thermosetting resin and increase the surface roughness; or, the method Two: drying the swollen and washed thermosetting resin, and chemically degrading the dried thermosetting resin by using an existing chemical degradation method. The invention can realize the direct functional modification and utilization of the waste thermosetting resin, and can also effectively shorten the time-consuming recovery of the waste thermosetting resin under mild chemical degradation conditions.

Description

technical field [0001] The invention belongs to the technical field of recycling waste polymer materials, and relates to a microwave recycling method for waste thermosetting resins. Background technique [0002] Thermosetting resin has excellent mechanical properties, insoluble, non-melting, high temperature resistance, chemical corrosion resistance and other properties, and is widely used in electronic appliances, automobiles, aerospace, coatings and other industries. When these products reach the life cycle, they become one of the main sources of waste thermosetting resins; many scraps and defective products are also produced during the production and processing process, which become another major source of waste thermosetting resins. Due to the three-dimensional network structure formed between the molecular chains, these cured resin wastes cannot be dissolved in solvents, and can only be corroded and decomposed by strong oxidants or swelled in certain solvents, so recycl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/08C08J11/00C08J7/12C08J11/10C08L67/06C08L63/00C08L61/00B01D17/022
CPCB01D17/0202C08J7/12C08J11/00C08J11/08C08J11/10C08J2367/06C08J2461/00C08J2463/00Y02W30/62
Inventor 王玉忠田飞徐世美王雄雷杨洋安文丽赵旭
Owner SICHUAN UNIV
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