Title:
METHOD FOR PRODUCING FLEXIBLE POLYURETHANE FOAM
Document Type and Number:
WIPO Patent Application WO/2021/045102
Kind Code:
A1
Abstract:
Provided is a method for stably and efficiently producing flexible polyurethane foam having excellent hydrophilic and water swelling properties, having a prescribed cell structure, and being suitable for use in microbial immobilization carriers for water treatment. A method for producing flexible polyurethane foam for microbial immobilization carriers for water treatment of the present invention has a step of causing foaming by mixing an A liquid that includes a urethane prepolymer and a polyisocyanate compound and a B liquid that includes a curing agent and a foaming agent. The temperature TA of the A liquid immediately before the mixing of the A liquid and the B liquid is 25-38°C and higher than the temperature TB of the B liquid immediately before the mixing. The flexible polyurethane foam has: a swollen density of 25-70 kg/m3 when swollen with water; an average pore count of 9-30 pores per 25 mm when swollen with water; and a volumetric swelling rate, expressed as the ratio of the volume when swollen with water to the volume when absolutely dry, of 110-1000%.
Inventors:
KONDO TOMOYUKI (JP)
HIROKAWA SOICHIRO (JP)
HIROKAWA SOICHIRO (JP)
Application Number:
PCT/JP2020/033261
Publication Date:
March 11, 2021
Filing Date:
September 02, 2020
Export Citation:
Assignee:
NISSHINBO CHEMICAL INC (JP)
International Classes:
C02F3/10; C08G18/00; C08G18/10; C08G18/48; C08K3/30; C08L75/08
Foreign References:
| JP2005206743A | 2005-08-04 | |||
| JPH10174990A | 1998-06-30 | |||
| JPH0951794A | 1997-02-25 |
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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