Polyurethane resin-forming composition for membrane-sealing material, and membrane and membrane module using same

Patent metadata

Field	Value
Publication number	US-12312435-B2
Application number	US-202017629050-A
Country	US
Kind code	B2
Filing date	Jul 17, 2020
Priority date	Jul 24, 2019
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

Provided is a polyurethane resin-forming composition for a membrane-sealing material, the polyurethane resin-forming composition contributing to formation of (1) a urethane resin that is excellent in moldability, has a suppressed elution amount of a low-molecular-weight reaction product, and has excellent appearance or (2) a urethane resin that has a low viscosity, is excellent in cast moldability, and has a reduced water elution amount of a low-molecular-weight reaction product and a reduced solvent elution amount of a molded product. The polyurethane resin-forming composition for a membrane-sealing material comprises: a polyisocyanate prepolymer (A) or an allophanate group-containing polyisocyanate prepolymer (A′) comprising a reaction product of a diphenylmethane diisocyanate (a1-1) and/or a modified product of a diphenylmethane diisocyanate (a1-2), and an active hydrogen-containing compound (a2); and a castor oil polymerized polyol (b1) comprising a castor oil polymerization product.

First claim

The invention claimed is:

1. A polyurethane resin-forming composition for a membrane-sealing material, comprising:
a polyisocyanate prepolymer (A); and
a curing agent (B), wherein
the polyisocyanate prepolymer (A) comprises a reaction product of
a diphenylmethane diisocyanate (a1-1) and/or a modified product of a diphenylmethane diisocyanate (a1-2), and
an active hydrogen-containing compound (a2),

the curing agent (B) comprises
a castor oil polymerized polyol (b1),
at least one polyol (b2) selected from the group consisting of castor oil and a castor oil-modified polyol, and
a hydroxyl group-containing amine-based compound (b3) other than the castor oil polymerized polyol (b1) and the polyol (b2)

the castor oil polymerized polyol (b1) comprises a castor oil polymerization product which is a homopolymer of a castor oil,
a content of the castor oil polymerization product is 1 mass % or more and 35 mass % or less with respect to a total amount of the polyisocyanate prepolymer (A) and the curing agent (B), and
a content of the hydroxyl group-containing amine-based compound (b3) in the curing agent (B) is 5 mass % or more and 30 mass % or less.

2. A membrane-sealing material comprising a cured product of the polyurethane resin-forming composition for a membrane-sealing material according to claim 1 .

3. A membrane module comprising:
a main body unit;
a membrane; and
a membrane-sealing material sealing a gap between the main body unit and the membrane, wherein
the membrane-sealing material is the membrane-sealing material according to claim 2 .

4. The membrane module according to claim 3 , wherein the membrane is a plurality of hollow fiber membranes, and
the membrane-sealing material seals
a gap between the main body unit and at least a portion of the plurality of hollow fiber membranes, and
at least a portion of a mutual gap between the plurality of hollow fiber membranes.

5. A polyurethane resin-forming composition for a membrane-sealing material, comprising:
an allophanate group-containing polyisocyanate prepolymer (A′); and
a curing agent (B), wherein
the allophanate group-containing polyisocyanate prepolymer (A′) comprises a reaction product of
a diphenylmethane diisocyanate (a1-1), and
an active hydrogen-containing compound (a2),

the curing agent (B) comprises
a castor oil polymerized polyol (b1),
at least one polyol (b2) selected from the group consisting of castor oil and a castor oil-modified polyol, and
a hydroxyl group-containing amine-based compound (b3) other than the castor oil polymerized polyol (b1) and the polyol (b2),

the castor oil polymerized polyol (b1) comprises a castor oil polymerization product which is a homopolymer of a castor oil,
a crosslinking group density of the polyurethane resin-forming composition for a membrane-sealing material is 0.65 mmol/g or more with respect to a total mass of the allophanate group-containing polyisocyanate prepolymer (A′) and the curing agent (B), and
a content of the hydroxyl group-containing amine-based compound (b3) in the curing agent (B) is 5 mass % or more and 30 mass % or less.

6. The polyurethane resin-forming composition for a membrane-sealing material according to claim 5 , wherein a content of the castor oil polymerization product is 1 mass % or more and 35 mass % or less with respect to a total amount of the allophanate group-containing polyisocyanate prepolymer (A′) and the curing agent (B).

7. A membrane-sealing material comprising a cured product of the polyurethane resin-forming composition for a membrane-sealing material according to claim 5 .

8. A membrane module comprising:
a main body unit;
a membrane; and
a membrane-sealing material sealing a gap between the main body unit and the membrane, wherein
the membrane-sealing material is the membrane-sealing material according to claim 7 .

9. The membrane module according to claim 8 , wherein the membrane is a plurality of hollow fiber membranes, and
the membrane-sealing material seals
a gap between the main body unit and at least a portion of the plurality of hollow fiber membranes, and
at least a portion of a mutual gap between the plurality of hollow fiber membranes.

10. A polyurethane resin-forming composition for a membrane-sealing material, comprising:
an allophanate group-containing polyisocyanate prepolymer (A′); and
a curing agent (B), wherein
the allophanate group-containing polyisocyanate prepolymer (A′) comprises a reaction product of
a diphenylmethane diisocyanate (a1-1), and
an active hydrogen-containing compound (a2),

the curing agent (B) comprises
a castor oil polymerized polyol (b1),
at least one polyol (b2) selected from the group consisting of castor oil and a castor oil-modified polyol, and
a hydroxyl group-containing amine-based compound (b3) other than the castor oil polymerized polyol (b1) and the polyol (b2),

the castor oil polymerized polyol (b1) comprises a castor oil polymerization product which is a homopolymer of a castor oil,
a content of the castor oil polymerization product is 1 mass % or more and 35 mass % or less with respect to a total amount of the allophanate group-containing polyisocyanate prepolymer (A′) and the curing agent (B) and
a content of the hydroxyl group-containing amine-based compound (b3) in the curing agent (B) is 5 mass % or more and 30 mass % or less.

Assignees

• Tosoh Corp

Inventors

• Yoshida Kouji

Classifications

• C09K3/10

  {Materials in mouldable or extrudable form} for sealing or packing joints or covers (filling pastes C09D5/34) · CPC title

• C08G18/62

  Polymers of compounds having carbon-to-carbon double bonds · CPC title

• C08G18/78 Primary

  Nitrogen {(C08G18/775, C08G18/776 take precedence)} · CPC title

• C08G18/10

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title

• C08G2340/00

  Filter material · CPC title