Degradation Recovery and Reuse of Waste Polyurethane Rigid Foams

doi:10.19491/j.issn.1001-9278.2021.08.015

Abstract

Abstract:

The two?component alcoholysis agents， ethylene glycol （EG） and propylene glycol （PG）， were used to degrade the waste polyurethane （PU） rigid foams to obtain a degradation product， oligomer polyol. This degradation product was further used together with lignin as raw materials to prepare the composite materials based on the recycled polyurethane （r?PU） rigid foams. The degradation effect of PU products and the compressive strength， water absorption， thermal conductivity， microscopic morphology and stability heat of r?PU composite materials were investigated using thermal conductivity tester， scanning electron microscope， thermogravimetric analyzer， and Fourier?transform infrared spectrometer. The results indicated that the waste PU achieved an optimal degradation effect at a mass ratio of EG to PG of 2∶3 （m_EG∶m_PG）. The foam cell wall was thick and relatively uniform， and the skeleton geometry was complete. The compressive strength of r?PU composites was 185.3 kPa and its thermal conductivity was 0.0215 W/（m·K）. These data can meet the requirements of national standards.

Key words: waste polyurethane rigid foam, degradation, alcoholysis agent, recovery, reuse, lignin

CLC Number:

TQ323.8

GU Xiaohua, LYU Shiwei, LIU Siwen, WANG Jiajia, KANG Yuanyuan. Degradation Recovery and Reuse of Waste Polyurethane Rigid Foams[J]. China Plastics, 2021, 35(8): 105-111.

Figures/Tables 10

Fig.1. Schematic diagram of foaming reaction principle

Fig.2. FTIR spectra of degradation products of waste PU degraded with various proportion of alcoholysis agent

m_EG∶m_PG	黏度（25 ℃）/mPa?s	羟值/mg KOH·g^-1
1∶2	2 652	406
2∶3	2 502	441
1∶1	2 808	409
3∶2	3 420	357

Tab.1. Effect of mEG∶mPG on the viscosity and hydroxyl value of degradation products

Fig.3. Effect of lignin content on compressive strength of r?PU rigid foams

木质素含量/%	导热系数/W·（m·K）^-1
0	0.025 1
3	0.024 6
6	0.021 8
9	0.023 7

Tab.2. Thermal conductivity of r?PU rigid foam composites with different lignin content

Fig.4. Effect of lignin addition on the water absorption of r?PU rigid foams

Fig.5. Effect of lignin addition on the loss rate of r?PU rigid foam composites after water immersion treatment

Fig.6. FTIR spectra of r?PU rigid foam composites prepared with different lignin additions

Fig.7. SEM graphs of r?PU rigid foam composites prepared with different lignin additions

Fig.8. TG and DTG curves of r?PU rigid foam composites prepared with different lignin additions

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