Green Preparation and Properties of New Hydrophobic Rigid Polyurethane Foams

doi:10.19491/j.issn.1001-9278.2021.04.005

Abstract

Abstract:

In this study， a novel type of hydrophobic polyurethane rigid foams was prepared through a semi-prepolymerization foaming process using perfluoropolyether as a foam stabilizer and water as a green chemical foaming agent. The results indicated that the contact angle of the rigid foams increased up to 139.7 ° with an increase in the content of perfluoropolyether. The foams exhibited a higher closed cell ratio with the addition perfluoropolyether. As the content of perfluoropolyether increased， the cell became more uniform， the cell size gradually decreased， the cell density increased， and the thermal conductivity decreased significantly. The compressive strength reached up to 0.822 MPa.

Key words: rigid polyurethane, foam, foam stabilizer, water-blown method, hydrophobic property

CLC Number:

TQ 328.3

WANG Wei, WANG Dong, DONG Weifu. Green Preparation and Properties of New Hydrophobic Rigid Polyurethane Foams[J]. China Plastics, 2021, 35(4): 23-29.

Figures/Tables 9

样品编号	聚醚多元醇4110/g	全氟聚醚/g	水/g	DBTDL/g	TEOA/g	PAPI/g
RPUF?0%	100	0	1.5	0.36	0.12	140
RPUF?1%	100	2.4	1.5	0.36	0.12	140
RPUF?1.5%	100	3.6	1.5	0.36	0.12	140
RPUF?2%	100	4.8	1.5	0.36	0.12	140
RPUF?2.5%	100	6	1.5	0.36	0.12	140

Tab. 1. Formulas of different rigid polyurethane foams

Fig.1. Scheme of the foaming process

Fig.2. Relationship between viscosity and shear rate with different molar ratios of —NCO and —OH groups

Fig.3. FTIR spectra of RPUF?0%,RPUF?1%,RPUF?1.5%,RPUF?2% and RPUF?2.5% samples

Fig.4. SEM of RPUF?0%， RPUF?1%， RPUF?1.5%， RPUF?2% and RPUF?2.5%

Fig.5. Density and compressive strength of different PU foams

Fig.6. Water static contact angle of RPUF?0%, RPUF?1%, RPUF?1.5%, RPUF?2% and RPUF?2.5%

Fig.7. Infrared thermography of different samples on a 60 ℃ hot stage at different time

Fig.8. Thermal conductivity of the samples at 30 ℃

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