Effect of Two⁃Component Small Molecule Alcoholysis Agent on Recycling and Reuse of Waste PU Foam

doi:10.19491/j.issn.1001-9278.2020.10.012

Abstract

Abstract:

Polyols were obtained by degrading waste PU rigid foams with cross-linking agents and catalysts containing small-molecular alcohols. The resultant degradable materials were blended with polyether polyols， catalysts and blowing agents to prepare white materials and then mixed with black isocyanates to get the regenerated PU hard foam. The rege-nerated PU rigid foam was analyzed in terms of the viscosity， hydroxyl value， density， strength， water absorption， thermal stability， infrared spectroscopy and scanning electron microscopy， and the effect of addition amount of catalyst on the recycling and reuse of the waste PU rigid foams was investigated. The results indicated that the waste PU rigid foams achieved the optimum degradation effect when 0.9 g of KOH catalyst was added. The density of regenerated PU hard foam was 37.6 kg/cm³， its compressive strength was 164.2 kPa， its thermal conductivity was 0.015 24 W/（m·K ）， and the water absorption rate was 0.429 5 %.

Key words: waste polyurethane rigid foam, small molecule alcohol, alcoholysis, foaming, additive

CLC Number:

TQ 323.8

GU Xiaohua, LYU Shiwei, LUO Hongxiang, LI Yan. Effect of Two⁃Component Small Molecule Alcoholysis Agent on Recycling and Reuse of Waste PU Foam[J]. China Plastics, 2020, 34(10): 69-74.

Figures/Tables 7

References 12

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名称	黏度（25 ℃）/mPa·s	压缩强度/kPa	吸水率/%	羟值/mgKOH·g^-1	泡孔参数闭孔率/%	导热系数/W·（m·K）^-1
A1	9 532	123.5	0.558 6	485	86.7	0.018 28
A2	8 329	133.3	0.552 5	516	88.4	0.016 89
A3	9 302	123.8	0.561 2	543	95.6	0.016 14
A4	10 230	108.3	0.564 2	585	98.2	0.015 24
A5	9 430	115.4	0.532 6	564	95.5	0.017 47
A6	8 802	125.5	0.522 1	551	89.4	0.018 75
A7	10 990	106.2	0.544 1	563	84.7	0.018 72
A8	11 200	103.9	0.562 3	521	86.5	0.019 85
A9	9 232	112..2	0.585 4	495	85.2	0.021 85

名称	黏度（25 ℃）/mPa·s	压缩强度/kPa	吸水率/%	羟值/mgKOH·g^-1	泡孔参数闭孔率/%	导热系数/W·（m·K）^-1
A1	9 532	123.5	0.558 6	485	86.7	0.018 28
A2	8 329	133.3	0.552 5	516	88.4	0.016 89
A3	9 302	123.8	0.561 2	543	95.6	0.016 14
A4	10 230	108.3	0.564 2	585	98.2	0.015 24
A5	9 430	115.4	0.532 6	564	95.5	0.017 47
A6	8 802	125.5	0.522 1	551	89.4	0.018 75
A7	10 990	106.2	0.544 1	563	84.7	0.018 72
A8	11 200	103.9	0.562 3	521	86.5	0.019 85
A9	9 232	112..2	0.585 4	495	85.2	0.021 85

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